diff options
Diffstat (limited to 'src/cpu/o3')
90 files changed, 27482 insertions, 0 deletions
diff --git a/src/cpu/o3/2bit_local_pred.cc b/src/cpu/o3/2bit_local_pred.cc new file mode 100644 index 000000000..77a45ea26 --- /dev/null +++ b/src/cpu/o3/2bit_local_pred.cc @@ -0,0 +1,146 @@ +/* + * Copyright (c) 2004-2006 The Regents of The University of Michigan + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are + * met: redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer; + * redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution; + * neither the name of the copyright holders nor the names of its + * contributors may be used to endorse or promote products derived from + * this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + * Authors: Kevin Lim + */ + +#include "base/intmath.hh" +#include "base/misc.hh" +#include "base/trace.hh" +#include "cpu/o3/2bit_local_pred.hh" + +LocalBP::LocalBP(unsigned _localPredictorSize, + unsigned _localCtrBits, + unsigned _instShiftAmt) + : localPredictorSize(_localPredictorSize), + localCtrBits(_localCtrBits), + instShiftAmt(_instShiftAmt) +{ + if (!isPowerOf2(localPredictorSize)) { + fatal("Invalid local predictor size!\n"); + } + + localPredictorSets = localPredictorSize / localCtrBits; + + if (!isPowerOf2(localPredictorSets)) { + fatal("Invalid number of local predictor sets! Check localCtrBits.\n"); + } + + // Setup the index mask. + indexMask = localPredictorSets - 1; + + DPRINTF(Fetch, "Branch predictor: index mask: %#x\n", indexMask); + + // Setup the array of counters for the local predictor. + localCtrs.resize(localPredictorSets); + + for (int i = 0; i < localPredictorSets; ++i) + localCtrs[i].setBits(_localCtrBits); + + DPRINTF(Fetch, "Branch predictor: local predictor size: %i\n", + localPredictorSize); + + DPRINTF(Fetch, "Branch predictor: local counter bits: %i\n", localCtrBits); + + DPRINTF(Fetch, "Branch predictor: instruction shift amount: %i\n", + instShiftAmt); +} + +void +LocalBP::reset() +{ + for (int i = 0; i < localPredictorSets; ++i) { + localCtrs[i].reset(); + } +} + +bool +LocalBP::lookup(Addr &branch_addr, void * &bp_history) +{ + bool taken; + uint8_t counter_val; + unsigned local_predictor_idx = getLocalIndex(branch_addr); + + DPRINTF(Fetch, "Branch predictor: Looking up index %#x\n", + local_predictor_idx); + + counter_val = localCtrs[local_predictor_idx].read(); + + DPRINTF(Fetch, "Branch predictor: prediction is %i.\n", + (int)counter_val); + + taken = getPrediction(counter_val); + +#if 0 + // Speculative update. + if (taken) { + DPRINTF(Fetch, "Branch predictor: Branch updated as taken.\n"); + localCtrs[local_predictor_idx].increment(); + } else { + DPRINTF(Fetch, "Branch predictor: Branch updated as not taken.\n"); + localCtrs[local_predictor_idx].decrement(); + } +#endif + + return taken; +} + +void +LocalBP::update(Addr &branch_addr, bool taken, void *bp_history) +{ + assert(bp_history == NULL); + unsigned local_predictor_idx; + + // Update the local predictor. + local_predictor_idx = getLocalIndex(branch_addr); + + DPRINTF(Fetch, "Branch predictor: Looking up index %#x\n", + local_predictor_idx); + + if (taken) { + DPRINTF(Fetch, "Branch predictor: Branch updated as taken.\n"); + localCtrs[local_predictor_idx].increment(); + } else { + DPRINTF(Fetch, "Branch predictor: Branch updated as not taken.\n"); + localCtrs[local_predictor_idx].decrement(); + } +} + +inline +bool +LocalBP::getPrediction(uint8_t &count) +{ + // Get the MSB of the count + return (count >> (localCtrBits - 1)); +} + +inline +unsigned +LocalBP::getLocalIndex(Addr &branch_addr) +{ + return (branch_addr >> instShiftAmt) & indexMask; +} diff --git a/src/cpu/o3/2bit_local_pred.hh b/src/cpu/o3/2bit_local_pred.hh new file mode 100644 index 000000000..954b86b4c --- /dev/null +++ b/src/cpu/o3/2bit_local_pred.hh @@ -0,0 +1,110 @@ +/* + * Copyright (c) 2004-2006 The Regents of The University of Michigan + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are + * met: redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer; + * redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution; + * neither the name of the copyright holders nor the names of its + * contributors may be used to endorse or promote products derived from + * this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + * Authors: Kevin Lim + */ + +#ifndef __CPU_O3_2BIT_LOCAL_PRED_HH__ +#define __CPU_O3_2BIT_LOCAL_PRED_HH__ + +#include "cpu/o3/sat_counter.hh" +#include "sim/host.hh" + +#include <vector> + +/** + * Implements a local predictor that uses the PC to index into a table of + * counters. Note that any time a pointer to the bp_history is given, it + * should be NULL using this predictor because it does not have any branch + * predictor state that needs to be recorded or updated; the update can be + * determined solely by the branch being taken or not taken. + */ +class LocalBP +{ + public: + /** + * Default branch predictor constructor. + * @param localPredictorSize Size of the local predictor. + * @param localCtrBits Number of bits per counter. + * @param instShiftAmt Offset amount for instructions to ignore alignment. + */ + LocalBP(unsigned localPredictorSize, unsigned localCtrBits, + unsigned instShiftAmt); + + /** + * Looks up the given address in the branch predictor and returns + * a true/false value as to whether it is taken. + * @param branch_addr The address of the branch to look up. + * @param bp_history Pointer to any bp history state. + * @return Whether or not the branch is taken. + */ + bool lookup(Addr &branch_addr, void * &bp_history); + + /** + * Updates the branch predictor with the actual result of a branch. + * @param branch_addr The address of the branch to update. + * @param taken Whether or not the branch was taken. + */ + void update(Addr &branch_addr, bool taken, void *bp_history); + + void squash(void *bp_history) + { assert(bp_history == NULL); } + + void reset(); + + private: + /** + * Returns the taken/not taken prediction given the value of the + * counter. + * @param count The value of the counter. + * @return The prediction based on the counter value. + */ + inline bool getPrediction(uint8_t &count); + + /** Calculates the local index based on the PC. */ + inline unsigned getLocalIndex(Addr &PC); + + /** Array of counters that make up the local predictor. */ + std::vector<SatCounter> localCtrs; + + /** Size of the local predictor. */ + unsigned localPredictorSize; + + /** Number of sets. */ + unsigned localPredictorSets; + + /** Number of bits of the local predictor's counters. */ + unsigned localCtrBits; + + /** Number of bits to shift the PC when calculating index. */ + unsigned instShiftAmt; + + /** Mask to get index bits. */ + unsigned indexMask; +}; + +#endif // __CPU_O3_2BIT_LOCAL_PRED_HH__ diff --git a/src/cpu/o3/SConscript b/src/cpu/o3/SConscript new file mode 100755 index 000000000..afbd4c533 --- /dev/null +++ b/src/cpu/o3/SConscript @@ -0,0 +1,77 @@ +# -*- mode:python -*- + +# Copyright (c) 2006 The Regents of The University of Michigan +# All rights reserved. +# +# Redistribution and use in source and binary forms, with or without +# modification, are permitted provided that the following conditions are +# met: redistributions of source code must retain the above copyright +# notice, this list of conditions and the following disclaimer; +# redistributions in binary form must reproduce the above copyright +# notice, this list of conditions and the following disclaimer in the +# documentation and/or other materials provided with the distribution; +# neither the name of the copyright holders nor the names of its +# contributors may be used to endorse or promote products derived from +# this software without specific prior written permission. +# +# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS +# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT +# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR +# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT +# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, +# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT +# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, +# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY +# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT +# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE +# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. +# +# Authors: Korey Sewell + +import os +import os.path +import sys + +# Import build environment variable from SConstruct. +Import('env') + + +################################################################# +# +# Include ISA-specific files for the O3 CPU-model +# +################################################################# + +sources = [] + +if env['TARGET_ISA'] == 'alpha': + sources += Split(''' + alpha/dyn_inst.cc + alpha/cpu.cc + alpha/thread_context.cc + alpha/cpu_builder.cc + ''') +elif env['TARGET_ISA'] == 'mips': + sources += Split(''' + mips/dyn_inst.cc + mips/cpu.cc + mips/thread_context.cc + mips/cpu_builder.cc + ''') +elif env['TARGET_ISA'] == 'sparc': + sources += Split(''' + sparc/dyn_inst.cc + sparc/cpu.cc + sparc/thread_context.cc + sparc/cpu_builder.cc + ''') +else: + sys.exit('O3 CPU does not support the \'%s\' ISA' % env['TARGET_ISA']) + + +# Convert file names to SCons File objects. This takes care of the +# path relative to the top of the directory tree. +sources = [File(s) for s in sources] + +Return('sources') + diff --git a/src/cpu/o3/alpha/cpu.cc b/src/cpu/o3/alpha/cpu.cc new file mode 100644 index 000000000..ed10b2fd1 --- /dev/null +++ b/src/cpu/o3/alpha/cpu.cc @@ -0,0 +1,38 @@ +/* + * Copyright (c) 2004-2005 The Regents of The University of Michigan + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are + * met: redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer; + * redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution; + * neither the name of the copyright holders nor the names of its + * contributors may be used to endorse or promote products derived from + * this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + * Authors: Kevin Lim + */ + +#include "cpu/o3/alpha/impl.hh" +#include "cpu/o3/alpha/cpu_impl.hh" +#include "cpu/o3/alpha/dyn_inst.hh" + +// Force instantiation of AlphaO3CPU for all the implemntations that are +// needed. Consider merging this and alpha_dyn_inst.cc, and maybe all +// classes that depend on a certain impl, into one file (alpha_impl.cc?). +template class AlphaO3CPU<AlphaSimpleImpl>; diff --git a/src/cpu/o3/alpha/cpu.hh b/src/cpu/o3/alpha/cpu.hh new file mode 100644 index 000000000..9d97f9701 --- /dev/null +++ b/src/cpu/o3/alpha/cpu.hh @@ -0,0 +1,205 @@ +/* + * Copyright (c) 2004-2006 The Regents of The University of Michigan + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are + * met: redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer; + * redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution; + * neither the name of the copyright holders nor the names of its + * contributors may be used to endorse or promote products derived from + * this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + * Authors: Kevin Lim + */ + +#ifndef __CPU_O3_ALPHA_CPU_HH__ +#define __CPU_O3_ALPHA_CPU_HH__ + +#include "arch/regfile.hh" +#include "arch/types.hh" +#include "cpu/thread_context.hh" +#include "cpu/o3/cpu.hh" +#include "sim/byteswap.hh" + +class EndQuiesceEvent; +namespace Kernel { + class Statistics; +}; + +class TranslatingPort; + +/** + * AlphaO3CPU class. Derives from the FullO3CPU class, and + * implements all ISA and implementation specific functions of the + * CPU. This is the CPU class that is used for the SimObjects, and is + * what is given to the DynInsts. Most of its state exists in the + * FullO3CPU; the state is has is mainly for ISA specific + * functionality. + */ +template <class Impl> +class AlphaO3CPU : public FullO3CPU<Impl> +{ + protected: + typedef TheISA::IntReg IntReg; + typedef TheISA::FloatReg FloatReg; + typedef TheISA::FloatRegBits FloatRegBits; + typedef TheISA::MiscReg MiscReg; + typedef TheISA::RegFile RegFile; + typedef TheISA::MiscRegFile MiscRegFile; + + public: + typedef O3ThreadState<Impl> ImplState; + typedef O3ThreadState<Impl> Thread; + typedef typename Impl::Params Params; + + /** Constructs an AlphaO3CPU with the given parameters. */ + AlphaO3CPU(Params *params); + +#if FULL_SYSTEM + /** ITB pointer. */ + AlphaITB *itb; + /** DTB pointer. */ + AlphaDTB *dtb; +#endif + + /** Registers statistics. */ + void regStats(); + +#if FULL_SYSTEM + /** Translates instruction requestion. */ + Fault translateInstReq(RequestPtr &req, Thread *thread) + { + return itb->translate(req, thread->getTC()); + } + + /** Translates data read request. */ + Fault translateDataReadReq(RequestPtr &req, Thread *thread) + { + return dtb->translate(req, thread->getTC(), false); + } + + /** Translates data write request. */ + Fault translateDataWriteReq(RequestPtr &req, Thread *thread) + { + return dtb->translate(req, thread->getTC(), true); + } + +#else + /** Translates instruction requestion in syscall emulation mode. */ + Fault translateInstReq(RequestPtr &req, Thread *thread) + { + return thread->getProcessPtr()->pTable->translate(req); + } + + /** Translates data read request in syscall emulation mode. */ + Fault translateDataReadReq(RequestPtr &req, Thread *thread) + { + return thread->getProcessPtr()->pTable->translate(req); + } + + /** Translates data write request in syscall emulation mode. */ + Fault translateDataWriteReq(RequestPtr &req, Thread *thread) + { + return thread->getProcessPtr()->pTable->translate(req); + } + +#endif + /** Reads a miscellaneous register. */ + MiscReg readMiscReg(int misc_reg, unsigned tid); + + /** Reads a misc. register, including any side effects the read + * might have as defined by the architecture. + */ + MiscReg readMiscRegWithEffect(int misc_reg, Fault &fault, unsigned tid); + + /** Sets a miscellaneous register. */ + Fault setMiscReg(int misc_reg, const MiscReg &val, unsigned tid); + + /** Sets a misc. register, including any side effects the write + * might have as defined by the architecture. + */ + Fault setMiscRegWithEffect(int misc_reg, const MiscReg &val, unsigned tid); + + /** Initiates a squash of all in-flight instructions for a given + * thread. The source of the squash is an external update of + * state through the TC. + */ + void squashFromTC(unsigned tid); + +#if FULL_SYSTEM + /** Posts an interrupt. */ + void post_interrupt(int int_num, int index); + /** Reads the interrupt flag. */ + int readIntrFlag(); + /** Sets the interrupt flags. */ + void setIntrFlag(int val); + /** HW return from error interrupt. */ + Fault hwrei(unsigned tid); + /** Returns if a specific PC is a PAL mode PC. */ + bool inPalMode(uint64_t PC) + { return AlphaISA::PcPAL(PC); } + + bool simPalCheck(int palFunc, unsigned tid); + + /** Processes any interrupts. */ + void processInterrupts(); + + /** Halts the CPU. */ + void halt() { panic("Halt not implemented!\n"); } +#endif + + /** Traps to handle given fault. */ + void trap(Fault fault, unsigned tid); + +#if !FULL_SYSTEM + /** Executes a syscall. + * @todo: Determine if this needs to be virtual. + */ + void syscall(int64_t callnum, int tid); + /** Gets a syscall argument. */ + IntReg getSyscallArg(int i, int tid); + + /** Used to shift args for indirect syscall. */ + void setSyscallArg(int i, IntReg val, int tid); + + /** Sets the return value of a syscall. */ + void setSyscallReturn(SyscallReturn return_value, int tid); +#endif + + /** CPU read function, forwards read to LSQ. */ + template <class T> + Fault read(RequestPtr &req, T &data, int load_idx) + { + return this->iew.ldstQueue.read(req, data, load_idx); + } + + /** CPU write function, forwards write to LSQ. */ + template <class T> + Fault write(RequestPtr &req, T &data, int store_idx) + { + return this->iew.ldstQueue.write(req, data, store_idx); + } + + Addr lockAddr; + + /** Temporary fix for the lock flag, works in the UP case. */ + bool lockFlag; +}; + +#endif // __CPU_O3_ALPHA_CPU_HH__ diff --git a/src/cpu/o3/alpha/cpu_builder.cc b/src/cpu/o3/alpha/cpu_builder.cc new file mode 100644 index 000000000..fbf1f342c --- /dev/null +++ b/src/cpu/o3/alpha/cpu_builder.cc @@ -0,0 +1,430 @@ +/* + * Copyright (c) 2004-2006 The Regents of The University of Michigan + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are + * met: redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer; + * redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution; + * neither the name of the copyright holders nor the names of its + * contributors may be used to endorse or promote products derived from + * this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + * Authors: Kevin Lim + */ + +#include <string> + +#include "cpu/base.hh" +#include "cpu/o3/alpha/cpu.hh" +#include "cpu/o3/alpha/impl.hh" +#include "cpu/o3/alpha/params.hh" +#include "cpu/o3/fu_pool.hh" +#include "sim/builder.hh" + +class DerivO3CPU : public AlphaO3CPU<AlphaSimpleImpl> +{ + public: + DerivO3CPU(AlphaSimpleParams *p) + : AlphaO3CPU<AlphaSimpleImpl>(p) + { } +}; + +BEGIN_DECLARE_SIM_OBJECT_PARAMS(DerivO3CPU) + + Param<int> clock; + Param<int> numThreads; +Param<int> activity; + +#if FULL_SYSTEM +SimObjectParam<System *> system; +Param<int> cpu_id; +SimObjectParam<AlphaITB *> itb; +SimObjectParam<AlphaDTB *> dtb; +Param<Tick> profile; +#else +SimObjectVectorParam<Process *> workload; +#endif // FULL_SYSTEM + +SimObjectParam<MemObject *> mem; + +SimObjectParam<BaseCPU *> checker; + +Param<Counter> max_insts_any_thread; +Param<Counter> max_insts_all_threads; +Param<Counter> max_loads_any_thread; +Param<Counter> max_loads_all_threads; +Param<Counter> stats_reset_inst; +Param<Tick> progress_interval; + +Param<unsigned> cachePorts; + +Param<unsigned> decodeToFetchDelay; +Param<unsigned> renameToFetchDelay; +Param<unsigned> iewToFetchDelay; +Param<unsigned> commitToFetchDelay; +Param<unsigned> fetchWidth; + +Param<unsigned> renameToDecodeDelay; +Param<unsigned> iewToDecodeDelay; +Param<unsigned> commitToDecodeDelay; +Param<unsigned> fetchToDecodeDelay; +Param<unsigned> decodeWidth; + +Param<unsigned> iewToRenameDelay; +Param<unsigned> commitToRenameDelay; +Param<unsigned> decodeToRenameDelay; +Param<unsigned> renameWidth; + +Param<unsigned> commitToIEWDelay; +Param<unsigned> renameToIEWDelay; +Param<unsigned> issueToExecuteDelay; +Param<unsigned> dispatchWidth; +Param<unsigned> issueWidth; +Param<unsigned> wbWidth; +Param<unsigned> wbDepth; +SimObjectParam<FUPool *> fuPool; + +Param<unsigned> iewToCommitDelay; +Param<unsigned> renameToROBDelay; +Param<unsigned> commitWidth; +Param<unsigned> squashWidth; +Param<Tick> trapLatency; + +Param<unsigned> backComSize; +Param<unsigned> forwardComSize; + +Param<std::string> predType; +Param<unsigned> localPredictorSize; +Param<unsigned> localCtrBits; +Param<unsigned> localHistoryTableSize; +Param<unsigned> localHistoryBits; +Param<unsigned> globalPredictorSize; +Param<unsigned> globalCtrBits; +Param<unsigned> globalHistoryBits; +Param<unsigned> choicePredictorSize; +Param<unsigned> choiceCtrBits; + +Param<unsigned> BTBEntries; +Param<unsigned> BTBTagSize; + +Param<unsigned> RASSize; + +Param<unsigned> LQEntries; +Param<unsigned> SQEntries; +Param<unsigned> LFSTSize; +Param<unsigned> SSITSize; + +Param<unsigned> numPhysIntRegs; +Param<unsigned> numPhysFloatRegs; +Param<unsigned> numIQEntries; +Param<unsigned> numROBEntries; + +Param<unsigned> smtNumFetchingThreads; +Param<std::string> smtFetchPolicy; +Param<std::string> smtLSQPolicy; +Param<unsigned> smtLSQThreshold; +Param<std::string> smtIQPolicy; +Param<unsigned> smtIQThreshold; +Param<std::string> smtROBPolicy; +Param<unsigned> smtROBThreshold; +Param<std::string> smtCommitPolicy; + +Param<unsigned> instShiftAmt; + +Param<bool> defer_registration; + +Param<bool> function_trace; +Param<Tick> function_trace_start; + +END_DECLARE_SIM_OBJECT_PARAMS(DerivO3CPU) + +BEGIN_INIT_SIM_OBJECT_PARAMS(DerivO3CPU) + + INIT_PARAM(clock, "clock speed"), + INIT_PARAM(numThreads, "number of HW thread contexts"), + INIT_PARAM_DFLT(activity, "Initial activity count", 0), + +#if FULL_SYSTEM + INIT_PARAM(system, "System object"), + INIT_PARAM(cpu_id, "processor ID"), + INIT_PARAM(itb, "Instruction translation buffer"), + INIT_PARAM(dtb, "Data translation buffer"), + INIT_PARAM(profile, ""), +#else + INIT_PARAM(workload, "Processes to run"), +#endif // FULL_SYSTEM + + INIT_PARAM(mem, "Memory"), + + INIT_PARAM_DFLT(checker, "Checker CPU", NULL), + + INIT_PARAM_DFLT(max_insts_any_thread, + "Terminate when any thread reaches this inst count", + 0), + INIT_PARAM_DFLT(max_insts_all_threads, + "Terminate when all threads have reached" + "this inst count", + 0), + INIT_PARAM_DFLT(max_loads_any_thread, + "Terminate when any thread reaches this load count", + 0), + INIT_PARAM_DFLT(max_loads_all_threads, + "Terminate when all threads have reached this load" + "count", + 0), + INIT_PARAM_DFLT(stats_reset_inst, + "blah", + 0), + INIT_PARAM_DFLT(progress_interval, "Progress interval", 0), + + INIT_PARAM_DFLT(cachePorts, "Cache Ports", 200), + + INIT_PARAM(decodeToFetchDelay, "Decode to fetch delay"), + INIT_PARAM(renameToFetchDelay, "Rename to fetch delay"), + INIT_PARAM(iewToFetchDelay, "Issue/Execute/Writeback to fetch" + "delay"), + INIT_PARAM(commitToFetchDelay, "Commit to fetch delay"), + INIT_PARAM(fetchWidth, "Fetch width"), + INIT_PARAM(renameToDecodeDelay, "Rename to decode delay"), + INIT_PARAM(iewToDecodeDelay, "Issue/Execute/Writeback to decode" + "delay"), + INIT_PARAM(commitToDecodeDelay, "Commit to decode delay"), + INIT_PARAM(fetchToDecodeDelay, "Fetch to decode delay"), + INIT_PARAM(decodeWidth, "Decode width"), + + INIT_PARAM(iewToRenameDelay, "Issue/Execute/Writeback to rename" + "delay"), + INIT_PARAM(commitToRenameDelay, "Commit to rename delay"), + INIT_PARAM(decodeToRenameDelay, "Decode to rename delay"), + INIT_PARAM(renameWidth, "Rename width"), + + INIT_PARAM(commitToIEWDelay, "Commit to " + "Issue/Execute/Writeback delay"), + INIT_PARAM(renameToIEWDelay, "Rename to " + "Issue/Execute/Writeback delay"), + INIT_PARAM(issueToExecuteDelay, "Issue to execute delay (internal" + "to the IEW stage)"), + INIT_PARAM(dispatchWidth, "Dispatch width"), + INIT_PARAM(issueWidth, "Issue width"), + INIT_PARAM(wbWidth, "Writeback width"), + INIT_PARAM(wbDepth, "Writeback depth (number of cycles it can buffer)"), + INIT_PARAM_DFLT(fuPool, "Functional unit pool", NULL), + + INIT_PARAM(iewToCommitDelay, "Issue/Execute/Writeback to commit " + "delay"), + INIT_PARAM(renameToROBDelay, "Rename to reorder buffer delay"), + INIT_PARAM(commitWidth, "Commit width"), + INIT_PARAM(squashWidth, "Squash width"), + INIT_PARAM_DFLT(trapLatency, "Number of cycles before the trap is handled", 6), + + INIT_PARAM(backComSize, "Time buffer size for backwards communication"), + INIT_PARAM(forwardComSize, "Time buffer size for forward communication"), + + INIT_PARAM(predType, "Type of branch predictor ('local', 'tournament')"), + INIT_PARAM(localPredictorSize, "Size of local predictor"), + INIT_PARAM(localCtrBits, "Bits per counter"), + INIT_PARAM(localHistoryTableSize, "Size of local history table"), + INIT_PARAM(localHistoryBits, "Bits for the local history"), + INIT_PARAM(globalPredictorSize, "Size of global predictor"), + INIT_PARAM(globalCtrBits, "Bits per counter"), + INIT_PARAM(globalHistoryBits, "Bits of history"), + INIT_PARAM(choicePredictorSize, "Size of choice predictor"), + INIT_PARAM(choiceCtrBits, "Bits of choice counters"), + + INIT_PARAM(BTBEntries, "Number of BTB entries"), + INIT_PARAM(BTBTagSize, "Size of the BTB tags, in bits"), + + INIT_PARAM(RASSize, "RAS size"), + + INIT_PARAM(LQEntries, "Number of load queue entries"), + INIT_PARAM(SQEntries, "Number of store queue entries"), + INIT_PARAM(LFSTSize, "Last fetched store table size"), + INIT_PARAM(SSITSize, "Store set ID table size"), + + INIT_PARAM(numPhysIntRegs, "Number of physical integer registers"), + INIT_PARAM(numPhysFloatRegs, "Number of physical floating point " + "registers"), + INIT_PARAM(numIQEntries, "Number of instruction queue entries"), + INIT_PARAM(numROBEntries, "Number of reorder buffer entries"), + + INIT_PARAM_DFLT(smtNumFetchingThreads, "SMT Number of Fetching Threads", 1), + INIT_PARAM_DFLT(smtFetchPolicy, "SMT Fetch Policy", "SingleThread"), + INIT_PARAM_DFLT(smtLSQPolicy, "SMT LSQ Sharing Policy", "Partitioned"), + INIT_PARAM_DFLT(smtLSQThreshold,"SMT LSQ Threshold", 100), + INIT_PARAM_DFLT(smtIQPolicy, "SMT IQ Policy", "Partitioned"), + INIT_PARAM_DFLT(smtIQThreshold, "SMT IQ Threshold", 100), + INIT_PARAM_DFLT(smtROBPolicy, "SMT ROB Sharing Policy", "Partitioned"), + INIT_PARAM_DFLT(smtROBThreshold,"SMT ROB Threshold", 100), + INIT_PARAM_DFLT(smtCommitPolicy,"SMT Commit Fetch Policy", "RoundRobin"), + + INIT_PARAM(instShiftAmt, "Number of bits to shift instructions by"), + INIT_PARAM(defer_registration, "defer system registration (for sampling)"), + + INIT_PARAM(function_trace, "Enable function trace"), + INIT_PARAM(function_trace_start, "Cycle to start function trace") + +END_INIT_SIM_OBJECT_PARAMS(DerivO3CPU) + +CREATE_SIM_OBJECT(DerivO3CPU) +{ + DerivO3CPU *cpu; + +#if FULL_SYSTEM + // Full-system only supports a single thread for the moment. + int actual_num_threads = 1; +#else + // In non-full-system mode, we infer the number of threads from + // the workload if it's not explicitly specified. + int actual_num_threads = + (numThreads.isValid() && numThreads >= workload.size()) ? + numThreads : workload.size(); + + if (workload.size() == 0) { + fatal("Must specify at least one workload!"); + } +#endif + + AlphaSimpleParams *params = new AlphaSimpleParams; + + params->clock = clock; + + params->name = getInstanceName(); + params->numberOfThreads = actual_num_threads; + params->activity = activity; + +#if FULL_SYSTEM + params->system = system; + params->cpu_id = cpu_id; + params->itb = itb; + params->dtb = dtb; + params->profile = profile; +#else + params->workload = workload; +#endif // FULL_SYSTEM + + params->mem = mem; + + params->checker = checker; + + params->max_insts_any_thread = max_insts_any_thread; + params->max_insts_all_threads = max_insts_all_threads; + params->max_loads_any_thread = max_loads_any_thread; + params->max_loads_all_threads = max_loads_all_threads; + params->stats_reset_inst = stats_reset_inst; + params->progress_interval = progress_interval; + + // + // Caches + // + params->cachePorts = cachePorts; + + params->decodeToFetchDelay = decodeToFetchDelay; + params->renameToFetchDelay = renameToFetchDelay; + params->iewToFetchDelay = iewToFetchDelay; + params->commitToFetchDelay = commitToFetchDelay; + params->fetchWidth = fetchWidth; + + params->renameToDecodeDelay = renameToDecodeDelay; + params->iewToDecodeDelay = iewToDecodeDelay; + params->commitToDecodeDelay = commitToDecodeDelay; + params->fetchToDecodeDelay = fetchToDecodeDelay; + params->decodeWidth = decodeWidth; + + params->iewToRenameDelay = iewToRenameDelay; + params->commitToRenameDelay = commitToRenameDelay; + params->decodeToRenameDelay = decodeToRenameDelay; + params->renameWidth = renameWidth; + + params->commitToIEWDelay = commitToIEWDelay; + params->renameToIEWDelay = renameToIEWDelay; + params->issueToExecuteDelay = issueToExecuteDelay; + params->dispatchWidth = dispatchWidth; + params->issueWidth = issueWidth; + params->wbWidth = wbWidth; + params->wbDepth = wbDepth; + params->fuPool = fuPool; + + params->iewToCommitDelay = iewToCommitDelay; + params->renameToROBDelay = renameToROBDelay; + params->commitWidth = commitWidth; + params->squashWidth = squashWidth; + params->trapLatency = trapLatency; + + params->backComSize = backComSize; + params->forwardComSize = forwardComSize; + + params->predType = predType; + params->localPredictorSize = localPredictorSize; + params->localCtrBits = localCtrBits; + params->localHistoryTableSize = localHistoryTableSize; + params->localHistoryBits = localHistoryBits; + params->globalPredictorSize = globalPredictorSize; + params->globalCtrBits = globalCtrBits; + params->globalHistoryBits = globalHistoryBits; + params->choicePredictorSize = choicePredictorSize; + params->choiceCtrBits = choiceCtrBits; + + params->BTBEntries = BTBEntries; + params->BTBTagSize = BTBTagSize; + + params->RASSize = RASSize; + + params->LQEntries = LQEntries; + params->SQEntries = SQEntries; + + params->SSITSize = SSITSize; + params->LFSTSize = LFSTSize; + + params->numPhysIntRegs = numPhysIntRegs; + params->numPhysFloatRegs = numPhysFloatRegs; + params->numIQEntries = numIQEntries; + params->numROBEntries = numROBEntries; + + params->smtNumFetchingThreads = smtNumFetchingThreads; + + // Default smtFetchPolicy to "RoundRobin", if necessary. + std::string round_robin_policy = "RoundRobin"; + std::string single_thread = "SingleThread"; + + if (actual_num_threads > 1 && single_thread.compare(smtFetchPolicy) == 0) + params->smtFetchPolicy = round_robin_policy; + else + params->smtFetchPolicy = smtFetchPolicy; + + params->smtIQPolicy = smtIQPolicy; + params->smtLSQPolicy = smtLSQPolicy; + params->smtLSQThreshold = smtLSQThreshold; + params->smtROBPolicy = smtROBPolicy; + params->smtROBThreshold = smtROBThreshold; + params->smtCommitPolicy = smtCommitPolicy; + + params->instShiftAmt = 2; + + params->deferRegistration = defer_registration; + + params->functionTrace = function_trace; + params->functionTraceStart = function_trace_start; + + cpu = new DerivO3CPU(params); + + return cpu; +} + +REGISTER_SIM_OBJECT("DerivO3CPU", DerivO3CPU) + diff --git a/src/cpu/o3/alpha/cpu_impl.hh b/src/cpu/o3/alpha/cpu_impl.hh new file mode 100644 index 000000000..b7362fad9 --- /dev/null +++ b/src/cpu/o3/alpha/cpu_impl.hh @@ -0,0 +1,422 @@ +/* + * Copyright (c) 2004-2006 The Regents of The University of Michigan + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are + * met: redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer; + * redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution; + * neither the name of the copyright holders nor the names of its + * contributors may be used to endorse or promote products derived from + * this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + * Authors: Kevin Lim + */ + +#include "config/use_checker.hh" + +#include "arch/alpha/faults.hh" +#include "arch/alpha/isa_traits.hh" +#include "base/cprintf.hh" +#include "base/statistics.hh" +#include "base/timebuf.hh" +#include "cpu/checker/thread_context.hh" +#include "sim/sim_events.hh" +#include "sim/stats.hh" + +#include "cpu/o3/alpha/cpu.hh" +#include "cpu/o3/alpha/params.hh" +#include "cpu/o3/alpha/thread_context.hh" +#include "cpu/o3/comm.hh" +#include "cpu/o3/thread_state.hh" + +#if FULL_SYSTEM +#include "arch/alpha/osfpal.hh" +#include "arch/isa_traits.hh" +#include "cpu/quiesce_event.hh" +#include "kern/kernel_stats.hh" +#include "sim/sim_exit.hh" +#include "sim/system.hh" +#endif + +template <class Impl> +AlphaO3CPU<Impl>::AlphaO3CPU(Params *params) +#if FULL_SYSTEM + : FullO3CPU<Impl>(params), itb(params->itb), dtb(params->dtb) +#else + : FullO3CPU<Impl>(params) +#endif +{ + DPRINTF(O3CPU, "Creating AlphaO3CPU object.\n"); + + // Setup any thread state. + this->thread.resize(this->numThreads); + + for (int i = 0; i < this->numThreads; ++i) { +#if FULL_SYSTEM + // SMT is not supported in FS mode yet. + assert(this->numThreads == 1); + this->thread[i] = new Thread(this, 0); + this->thread[i]->setStatus(ThreadContext::Suspended); +#else + if (i < params->workload.size()) { + DPRINTF(O3CPU, "Workload[%i] process is %#x", + i, this->thread[i]); + this->thread[i] = new Thread(this, i, params->workload[i], + i, params->mem); + + this->thread[i]->setStatus(ThreadContext::Suspended); + +#if !FULL_SYSTEM + /* Use this port to for syscall emulation writes to memory. */ + Port *mem_port; + TranslatingPort *trans_port; + trans_port = new TranslatingPort(csprintf("%s-%d-funcport", + name(), i), + params->workload[i]->pTable, + false); + mem_port = params->mem->getPort("functional"); + mem_port->setPeer(trans_port); + trans_port->setPeer(mem_port); + this->thread[i]->setMemPort(trans_port); +#endif + //usedTids[i] = true; + //threadMap[i] = i; + } else { + //Allocate Empty thread so M5 can use later + //when scheduling threads to CPU + Process* dummy_proc = NULL; + + this->thread[i] = new Thread(this, i, dummy_proc, i, params->mem); + //usedTids[i] = false; + } +#endif // !FULL_SYSTEM + + ThreadContext *tc; + + // Setup the TC that will serve as the interface to the threads/CPU. + AlphaTC<Impl> *alpha_tc = + new AlphaTC<Impl>; + + tc = alpha_tc; + + // If we're using a checker, then the TC should be the + // CheckerThreadContext. +#if USE_CHECKER + if (params->checker) { + tc = new CheckerThreadContext<AlphaTC<Impl> >( + alpha_tc, this->checker); + } +#endif + + alpha_tc->cpu = this; + alpha_tc->thread = this->thread[i]; + +#if FULL_SYSTEM + // Setup quiesce event. + this->thread[i]->quiesceEvent = new EndQuiesceEvent(tc); + + Port *mem_port; + FunctionalPort *phys_port; + VirtualPort *virt_port; + phys_port = new FunctionalPort(csprintf("%s-%d-funcport", + name(), i)); + mem_port = this->system->physmem->getPort("functional"); + mem_port->setPeer(phys_port); + phys_port->setPeer(mem_port); + + virt_port = new VirtualPort(csprintf("%s-%d-vport", + name(), i)); + mem_port = this->system->physmem->getPort("functional"); + mem_port->setPeer(virt_port); + virt_port->setPeer(mem_port); + + this->thread[i]->setPhysPort(phys_port); + this->thread[i]->setVirtPort(virt_port); +#endif + // Give the thread the TC. + this->thread[i]->tc = tc; + + // Add the TC to the CPU's list of TC's. + this->threadContexts.push_back(tc); + } + + for (int i=0; i < this->numThreads; i++) { + this->thread[i]->setFuncExeInst(0); + } + + // Sets CPU pointers. These must be set at this level because the CPU + // pointers are defined to be the highest level of CPU class. + this->fetch.setCPU(this); + this->decode.setCPU(this); + this->rename.setCPU(this); + this->iew.setCPU(this); + this->commit.setCPU(this); + + this->rob.setCPU(this); + this->regFile.setCPU(this); + + lockAddr = 0; + lockFlag = false; +} + +template <class Impl> +void +AlphaO3CPU<Impl>::regStats() +{ + // Register stats for everything that has stats. + this->fullCPURegStats(); + this->fetch.regStats(); + this->decode.regStats(); + this->rename.regStats(); + this->iew.regStats(); + this->commit.regStats(); +} + + +template <class Impl> +TheISA::MiscReg +AlphaO3CPU<Impl>::readMiscReg(int misc_reg, unsigned tid) +{ + return this->regFile.readMiscReg(misc_reg, tid); +} + +template <class Impl> +TheISA::MiscReg +AlphaO3CPU<Impl>::readMiscRegWithEffect(int misc_reg, Fault &fault, + unsigned tid) +{ + return this->regFile.readMiscRegWithEffect(misc_reg, fault, tid); +} + +template <class Impl> +Fault +AlphaO3CPU<Impl>::setMiscReg(int misc_reg, const MiscReg &val, unsigned tid) +{ + return this->regFile.setMiscReg(misc_reg, val, tid); +} + +template <class Impl> +Fault +AlphaO3CPU<Impl>::setMiscRegWithEffect(int misc_reg, const MiscReg &val, + unsigned tid) +{ + return this->regFile.setMiscRegWithEffect(misc_reg, val, tid); +} + +template <class Impl> +void +AlphaO3CPU<Impl>::squashFromTC(unsigned tid) +{ + this->thread[tid]->inSyscall = true; + this->commit.generateTCEvent(tid); +} + +#if FULL_SYSTEM + +template <class Impl> +void +AlphaO3CPU<Impl>::post_interrupt(int int_num, int index) +{ + BaseCPU::post_interrupt(int_num, index); + + if (this->thread[0]->status() == ThreadContext::Suspended) { + DPRINTF(IPI,"Suspended Processor awoke\n"); + this->threadContexts[0]->activate(); + } +} + +template <class Impl> +int +AlphaO3CPU<Impl>::readIntrFlag() +{ + return this->regFile.readIntrFlag(); +} + +template <class Impl> +void +AlphaO3CPU<Impl>::setIntrFlag(int val) +{ + this->regFile.setIntrFlag(val); +} + +template <class Impl> +Fault +AlphaO3CPU<Impl>::hwrei(unsigned tid) +{ + // Need to clear the lock flag upon returning from an interrupt. + this->lockFlag = false; + + this->thread[tid]->kernelStats->hwrei(); + + this->checkInterrupts = true; + + // FIXME: XXX check for interrupts? XXX + return NoFault; +} + +template <class Impl> +bool +AlphaO3CPU<Impl>::simPalCheck(int palFunc, unsigned tid) +{ + if (this->thread[tid]->kernelStats) + this->thread[tid]->kernelStats->callpal(palFunc, + this->threadContexts[tid]); + + switch (palFunc) { + case PAL::halt: + halt(); + if (--System::numSystemsRunning == 0) + exitSimLoop("all cpus halted"); + break; + + case PAL::bpt: + case PAL::bugchk: + if (this->system->breakpoint()) + return false; + break; + } + + return true; +} + +template <class Impl> +void +AlphaO3CPU<Impl>::processInterrupts() +{ + using namespace TheISA; + // Check for interrupts here. For now can copy the code that + // exists within isa_fullsys_traits.hh. Also assume that thread 0 + // is the one that handles the interrupts. + // @todo: Possibly consolidate the interrupt checking code. + // @todo: Allow other threads to handle interrupts. + + // Check if there are any outstanding interrupts + //Handle the interrupts + int ipl = 0; + int summary = 0; + + this->checkInterrupts = false; + + if (this->readMiscReg(IPR_ASTRR, 0)) + panic("asynchronous traps not implemented\n"); + + if (this->readMiscReg(IPR_SIRR, 0)) { + for (int i = INTLEVEL_SOFTWARE_MIN; + i < INTLEVEL_SOFTWARE_MAX; i++) { + if (this->readMiscReg(IPR_SIRR, 0) & (ULL(1) << i)) { + // See table 4-19 of the 21164 hardware reference + ipl = (i - INTLEVEL_SOFTWARE_MIN) + 1; + summary |= (ULL(1) << i); + } + } + } + + uint64_t interrupts = this->intr_status(); + + if (interrupts) { + for (int i = INTLEVEL_EXTERNAL_MIN; + i < INTLEVEL_EXTERNAL_MAX; i++) { + if (interrupts & (ULL(1) << i)) { + // See table 4-19 of the 21164 hardware reference + ipl = i; + summary |= (ULL(1) << i); + } + } + } + + if (ipl && ipl > this->readMiscReg(IPR_IPLR, 0)) { + this->setMiscReg(IPR_ISR, summary, 0); + this->setMiscReg(IPR_INTID, ipl, 0); + // Checker needs to know these two registers were updated. +#if USE_CHECKER + if (this->checker) { + this->checker->threadBase()->setMiscReg(IPR_ISR, summary); + this->checker->threadBase()->setMiscReg(IPR_INTID, ipl); + } +#endif + this->trap(Fault(new InterruptFault), 0); + DPRINTF(Flow, "Interrupt! IPLR=%d ipl=%d summary=%x\n", + this->readMiscReg(IPR_IPLR, 0), ipl, summary); + } +} + +#endif // FULL_SYSTEM + +template <class Impl> +void +AlphaO3CPU<Impl>::trap(Fault fault, unsigned tid) +{ + // Pass the thread's TC into the invoke method. + fault->invoke(this->threadContexts[tid]); +} + +#if !FULL_SYSTEM + +template <class Impl> +void +AlphaO3CPU<Impl>::syscall(int64_t callnum, int tid) +{ + DPRINTF(O3CPU, "[tid:%i] Executing syscall().\n\n", tid); + + DPRINTF(Activity,"Activity: syscall() called.\n"); + + // Temporarily increase this by one to account for the syscall + // instruction. + ++(this->thread[tid]->funcExeInst); + + // Execute the actual syscall. + this->thread[tid]->syscall(callnum); + + // Decrease funcExeInst by one as the normal commit will handle + // incrementing it. + --(this->thread[tid]->funcExeInst); +} + +template <class Impl> +TheISA::IntReg +AlphaO3CPU<Impl>::getSyscallArg(int i, int tid) +{ + return this->readArchIntReg(AlphaISA::ArgumentReg0 + i, tid); +} + +template <class Impl> +void +AlphaO3CPU<Impl>::setSyscallArg(int i, IntReg val, int tid) +{ + this->setArchIntReg(AlphaISA::ArgumentReg0 + i, val, tid); +} + +template <class Impl> +void +AlphaO3CPU<Impl>::setSyscallReturn(SyscallReturn return_value, int tid) +{ + // check for error condition. Alpha syscall convention is to + // indicate success/failure in reg a3 (r19) and put the + // return value itself in the standard return value reg (v0). + if (return_value.successful()) { + // no error + this->setArchIntReg(TheISA::SyscallSuccessReg, 0, tid); + this->setArchIntReg(TheISA::ReturnValueReg, return_value.value(), tid); + } else { + // got an error, return details + this->setArchIntReg(TheISA::SyscallSuccessReg, (IntReg) -1, tid); + this->setArchIntReg(TheISA::ReturnValueReg, -return_value.value(), tid); + } +} +#endif diff --git a/src/cpu/o3/alpha/dyn_inst.cc b/src/cpu/o3/alpha/dyn_inst.cc new file mode 100644 index 000000000..97d2f3d08 --- /dev/null +++ b/src/cpu/o3/alpha/dyn_inst.cc @@ -0,0 +1,36 @@ +/* + * Copyright (c) 2004-2005 The Regents of The University of Michigan + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are + * met: redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer; + * redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution; + * neither the name of the copyright holders nor the names of its + * contributors may be used to endorse or promote products derived from + * this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + * Authors: Kevin Lim + */ + +#include "cpu/o3/alpha/dyn_inst_impl.hh" +#include "cpu/o3/alpha/impl.hh" + +// Force instantiation of AlphaDynInst for all the implementations that +// are needed. +template class AlphaDynInst<AlphaSimpleImpl>; diff --git a/src/cpu/o3/alpha/dyn_inst.hh b/src/cpu/o3/alpha/dyn_inst.hh new file mode 100644 index 000000000..9dee610b6 --- /dev/null +++ b/src/cpu/o3/alpha/dyn_inst.hh @@ -0,0 +1,295 @@ +/* + * Copyright (c) 2004-2006 The Regents of The University of Michigan + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are + * met: redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer; + * redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution; + * neither the name of the copyright holders nor the names of its + * contributors may be used to endorse or promote products derived from + * this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + * Authors: Kevin Lim + */ + +#ifndef __CPU_O3_ALPHA_DYN_INST_HH__ +#define __CPU_O3_ALPHA_DYN_INST_HH__ + +#include "arch/isa_traits.hh" +#include "cpu/base_dyn_inst.hh" +#include "cpu/inst_seq.hh" +#include "cpu/o3/alpha/cpu.hh" +#include "cpu/o3/alpha/impl.hh" + +class Packet; + +/** + * Mostly implementation & ISA specific AlphaDynInst. As with most + * other classes in the new CPU model, it is templated on the Impl to + * allow for passing in of all types, such as the CPU type and the ISA + * type. The AlphaDynInst serves as the primary interface to the CPU + * for instructions that are executing. + */ +template <class Impl> +class AlphaDynInst : public BaseDynInst<Impl> +{ + public: + /** Typedef for the CPU. */ + typedef typename Impl::O3CPU O3CPU; + + /** Binary machine instruction type. */ + typedef TheISA::MachInst MachInst; + /** Extended machine instruction type. */ + typedef TheISA::ExtMachInst ExtMachInst; + /** Logical register index type. */ + typedef TheISA::RegIndex RegIndex; + /** Integer register index type. */ + typedef TheISA::IntReg IntReg; + typedef TheISA::FloatReg FloatReg; + typedef TheISA::FloatRegBits FloatRegBits; + /** Misc register index type. */ + typedef TheISA::MiscReg MiscReg; + + enum { + MaxInstSrcRegs = TheISA::MaxInstSrcRegs, //< Max source regs + MaxInstDestRegs = TheISA::MaxInstDestRegs, //< Max dest regs + }; + + public: + /** BaseDynInst constructor given a binary instruction. */ + AlphaDynInst(ExtMachInst inst, Addr PC, Addr Pred_PC, InstSeqNum seq_num, + O3CPU *cpu); + + /** BaseDynInst constructor given a static inst pointer. */ + AlphaDynInst(StaticInstPtr &_staticInst); + + /** Executes the instruction.*/ + Fault execute(); + + /** Initiates the access. Only valid for memory operations. */ + Fault initiateAcc(); + + /** Completes the access. Only valid for memory operations. */ + Fault completeAcc(Packet *pkt); + + private: + /** Initializes variables. */ + void initVars(); + + public: + /** Reads a miscellaneous register. */ + MiscReg readMiscReg(int misc_reg) + { + return this->cpu->readMiscReg(misc_reg, this->threadNumber); + } + + /** Reads a misc. register, including any side-effects the read + * might have as defined by the architecture. + */ + MiscReg readMiscRegWithEffect(int misc_reg, Fault &fault) + { + return this->cpu->readMiscRegWithEffect(misc_reg, fault, + this->threadNumber); + } + + /** Sets a misc. register. */ + Fault setMiscReg(int misc_reg, const MiscReg &val) + { + this->instResult.integer = val; + return this->cpu->setMiscReg(misc_reg, val, this->threadNumber); + } + + /** Sets a misc. register, including any side-effects the write + * might have as defined by the architecture. + */ + Fault setMiscRegWithEffect(int misc_reg, const MiscReg &val) + { + return this->cpu->setMiscRegWithEffect(misc_reg, val, + this->threadNumber); + } + +#if FULL_SYSTEM + /** Calls hardware return from error interrupt. */ + Fault hwrei(); + /** Reads interrupt flag. */ + int readIntrFlag(); + /** Sets interrupt flag. */ + void setIntrFlag(int val); + /** Checks if system is in PAL mode. */ + bool inPalMode(); + /** Traps to handle specified fault. */ + void trap(Fault fault); + bool simPalCheck(int palFunc); +#else + /** Calls a syscall. */ + void syscall(int64_t callnum); +#endif + + private: + /** Physical register index of the destination registers of this + * instruction. + */ + PhysRegIndex _destRegIdx[MaxInstDestRegs]; + + /** Physical register index of the source registers of this + * instruction. + */ + PhysRegIndex _srcRegIdx[MaxInstSrcRegs]; + + /** Physical register index of the previous producers of the + * architected destinations. + */ + PhysRegIndex _prevDestRegIdx[MaxInstDestRegs]; + + public: + + // The register accessor methods provide the index of the + // instruction's operand (e.g., 0 or 1), not the architectural + // register index, to simplify the implementation of register + // renaming. We find the architectural register index by indexing + // into the instruction's own operand index table. Note that a + // raw pointer to the StaticInst is provided instead of a + // ref-counted StaticInstPtr to redice overhead. This is fine as + // long as these methods don't copy the pointer into any long-term + // storage (which is pretty hard to imagine they would have reason + // to do). + + uint64_t readIntReg(const StaticInst *si, int idx) + { + return this->cpu->readIntReg(_srcRegIdx[idx]); + } + + FloatReg readFloatReg(const StaticInst *si, int idx, int width) + { + return this->cpu->readFloatReg(_srcRegIdx[idx], width); + } + + FloatReg readFloatReg(const StaticInst *si, int idx) + { + return this->cpu->readFloatReg(_srcRegIdx[idx]); + } + + FloatRegBits readFloatRegBits(const StaticInst *si, int idx, int width) + { + return this->cpu->readFloatRegBits(_srcRegIdx[idx], width); + } + + FloatRegBits readFloatRegBits(const StaticInst *si, int idx) + { + return this->cpu->readFloatRegBits(_srcRegIdx[idx]); + } + + /** @todo: Make results into arrays so they can handle multiple dest + * registers. + */ + void setIntReg(const StaticInst *si, int idx, uint64_t val) + { + this->cpu->setIntReg(_destRegIdx[idx], val); + BaseDynInst<Impl>::setIntReg(si, idx, val); + } + + void setFloatReg(const StaticInst *si, int idx, FloatReg val, int width) + { + this->cpu->setFloatReg(_destRegIdx[idx], val, width); + BaseDynInst<Impl>::setFloatReg(si, idx, val, width); + } + + void setFloatReg(const StaticInst *si, int idx, FloatReg val) + { + this->cpu->setFloatReg(_destRegIdx[idx], val); + BaseDynInst<Impl>::setFloatReg(si, idx, val); + } + + void setFloatRegBits(const StaticInst *si, int idx, + FloatRegBits val, int width) + { + this->cpu->setFloatRegBits(_destRegIdx[idx], val, width); + BaseDynInst<Impl>::setFloatRegBits(si, idx, val); + } + + void setFloatRegBits(const StaticInst *si, int idx, FloatRegBits val) + { + this->cpu->setFloatRegBits(_destRegIdx[idx], val); + BaseDynInst<Impl>::setFloatRegBits(si, idx, val); + } + + /** Returns the physical register index of the i'th destination + * register. + */ + PhysRegIndex renamedDestRegIdx(int idx) const + { + return _destRegIdx[idx]; + } + + /** Returns the physical register index of the i'th source register. */ + PhysRegIndex renamedSrcRegIdx(int idx) const + { + return _srcRegIdx[idx]; + } + + /** Returns the physical register index of the previous physical register + * that remapped to the same logical register index. + */ + PhysRegIndex prevDestRegIdx(int idx) const + { + return _prevDestRegIdx[idx]; + } + + /** Renames a destination register to a physical register. Also records + * the previous physical register that the logical register mapped to. + */ + void renameDestReg(int idx, + PhysRegIndex renamed_dest, + PhysRegIndex previous_rename) + { + _destRegIdx[idx] = renamed_dest; + _prevDestRegIdx[idx] = previous_rename; + } + + /** Renames a source logical register to the physical register which + * has/will produce that logical register's result. + * @todo: add in whether or not the source register is ready. + */ + void renameSrcReg(int idx, PhysRegIndex renamed_src) + { + _srcRegIdx[idx] = renamed_src; + } + + public: + /** Calculates EA part of a memory instruction. Currently unused, + * though it may be useful in the future if we want to split + * memory operations into EA calculation and memory access parts. + */ + Fault calcEA() + { + return this->staticInst->eaCompInst()->execute(this, this->traceData); + } + + /** Does the memory access part of a memory instruction. Currently unused, + * though it may be useful in the future if we want to split + * memory operations into EA calculation and memory access parts. + */ + Fault memAccess() + { + return this->staticInst->memAccInst()->execute(this, this->traceData); + } +}; + +#endif // __CPU_O3_ALPHA_DYN_INST_HH__ + diff --git a/src/cpu/o3/alpha/dyn_inst_impl.hh b/src/cpu/o3/alpha/dyn_inst_impl.hh new file mode 100644 index 000000000..2d1b4b309 --- /dev/null +++ b/src/cpu/o3/alpha/dyn_inst_impl.hh @@ -0,0 +1,172 @@ +/* + * Copyright (c) 2004-2006 The Regents of The University of Michigan + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are + * met: redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer; + * redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution; + * neither the name of the copyright holders nor the names of its + * contributors may be used to endorse or promote products derived from + * this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + * Authors: Kevin Lim + */ + +#include "cpu/o3/alpha/dyn_inst.hh" + +template <class Impl> +AlphaDynInst<Impl>::AlphaDynInst(ExtMachInst inst, Addr PC, Addr Pred_PC, + InstSeqNum seq_num, O3CPU *cpu) + : BaseDynInst<Impl>(inst, PC, Pred_PC, seq_num, cpu) +{ + initVars(); +} + +template <class Impl> +AlphaDynInst<Impl>::AlphaDynInst(StaticInstPtr &_staticInst) + : BaseDynInst<Impl>(_staticInst) +{ + initVars(); +} + +template <class Impl> +void +AlphaDynInst<Impl>::initVars() +{ + // Make sure to have the renamed register entries set to the same + // as the normal register entries. It will allow the IQ to work + // without any modifications. + for (int i = 0; i < this->staticInst->numDestRegs(); i++) { + _destRegIdx[i] = this->staticInst->destRegIdx(i); + } + + for (int i = 0; i < this->staticInst->numSrcRegs(); i++) { + _srcRegIdx[i] = this->staticInst->srcRegIdx(i); + this->_readySrcRegIdx[i] = 0; + } +} + +template <class Impl> +Fault +AlphaDynInst<Impl>::execute() +{ + // @todo: Pretty convoluted way to avoid squashing from happening + // when using the TC during an instruction's execution + // (specifically for instructions that have side-effects that use + // the TC). Fix this. + bool in_syscall = this->thread->inSyscall; + this->thread->inSyscall = true; + + this->fault = this->staticInst->execute(this, this->traceData); + + this->thread->inSyscall = in_syscall; + + return this->fault; +} + +template <class Impl> +Fault +AlphaDynInst<Impl>::initiateAcc() +{ + // @todo: Pretty convoluted way to avoid squashing from happening + // when using the TC during an instruction's execution + // (specifically for instructions that have side-effects that use + // the TC). Fix this. + bool in_syscall = this->thread->inSyscall; + this->thread->inSyscall = true; + + this->fault = this->staticInst->initiateAcc(this, this->traceData); + + this->thread->inSyscall = in_syscall; + + return this->fault; +} + +template <class Impl> +Fault +AlphaDynInst<Impl>::completeAcc(Packet *pkt) +{ + this->fault = this->staticInst->completeAcc(pkt, this, this->traceData); + + return this->fault; +} + +#if FULL_SYSTEM +template <class Impl> +Fault +AlphaDynInst<Impl>::hwrei() +{ + // Can only do a hwrei when in pal mode. + if (!this->cpu->inPalMode(this->readPC())) + return new AlphaISA::UnimplementedOpcodeFault; + + // Set the next PC based on the value of the EXC_ADDR IPR. + this->setNextPC(this->cpu->readMiscReg(AlphaISA::IPR_EXC_ADDR, + this->threadNumber)); + + // Tell CPU to clear any state it needs to if a hwrei is taken. + this->cpu->hwrei(this->threadNumber); + + // FIXME: XXX check for interrupts? XXX + return NoFault; +} + +template <class Impl> +int +AlphaDynInst<Impl>::readIntrFlag() +{ + return this->cpu->readIntrFlag(); +} + +template <class Impl> +void +AlphaDynInst<Impl>::setIntrFlag(int val) +{ + this->cpu->setIntrFlag(val); +} + +template <class Impl> +bool +AlphaDynInst<Impl>::inPalMode() +{ + return this->cpu->inPalMode(this->PC); +} + +template <class Impl> +void +AlphaDynInst<Impl>::trap(Fault fault) +{ + this->cpu->trap(fault, this->threadNumber); +} + +template <class Impl> +bool +AlphaDynInst<Impl>::simPalCheck(int palFunc) +{ + return this->cpu->simPalCheck(palFunc, this->threadNumber); +} +#else +template <class Impl> +void +AlphaDynInst<Impl>::syscall(int64_t callnum) +{ + this->cpu->syscall(callnum, this->threadNumber); +} +#endif + diff --git a/src/cpu/o3/alpha/impl.hh b/src/cpu/o3/alpha/impl.hh new file mode 100644 index 000000000..b928ae654 --- /dev/null +++ b/src/cpu/o3/alpha/impl.hh @@ -0,0 +1,92 @@ +/* + * Copyright (c) 2004-2005 The Regents of The University of Michigan + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are + * met: redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer; + * redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution; + * neither the name of the copyright holders nor the names of its + * contributors may be used to endorse or promote products derived from + * this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + * Authors: Kevin Lim + */ + +#ifndef __CPU_O3_ALPHA_IMPL_HH__ +#define __CPU_O3_ALPHA_IMPL_HH__ + +#include "arch/alpha/isa_traits.hh" + +#include "cpu/o3/alpha/params.hh" +#include "cpu/o3/cpu_policy.hh" + + +// Forward declarations. +template <class Impl> +class AlphaDynInst; + +template <class Impl> +class AlphaO3CPU; + +/** Implementation specific struct that defines several key types to the + * CPU, the stages within the CPU, the time buffers, and the DynInst. + * The struct defines the ISA, the CPU policy, the specific DynInst, the + * specific O3CPU, and all of the structs from the time buffers to do + * communication. + * This is one of the key things that must be defined for each hardware + * specific CPU implementation. + */ +struct AlphaSimpleImpl +{ + /** The type of MachInst. */ + typedef TheISA::MachInst MachInst; + + /** The CPU policy to be used, which defines all of the CPU stages. */ + typedef SimpleCPUPolicy<AlphaSimpleImpl> CPUPol; + + /** The DynInst type to be used. */ + typedef AlphaDynInst<AlphaSimpleImpl> DynInst; + + /** The refcounted DynInst pointer to be used. In most cases this is + * what should be used, and not DynInst *. + */ + typedef RefCountingPtr<DynInst> DynInstPtr; + + /** The O3CPU type to be used. */ + typedef AlphaO3CPU<AlphaSimpleImpl> O3CPU; + + /** Same typedef, but for CPUType. BaseDynInst may not always use + * an O3 CPU, so it's clearer to call it CPUType instead in that + * case. + */ + typedef O3CPU CPUType; + + /** The Params to be passed to each stage. */ + typedef AlphaSimpleParams Params; + + enum { + MaxWidth = 8, + MaxThreads = 4 + }; +}; + +/** The O3Impl to be used. */ +typedef AlphaSimpleImpl O3CPUImpl; + +#endif // __CPU_O3_ALPHA_IMPL_HH__ diff --git a/src/cpu/o3/alpha/params.hh b/src/cpu/o3/alpha/params.hh new file mode 100644 index 000000000..c618cee08 --- /dev/null +++ b/src/cpu/o3/alpha/params.hh @@ -0,0 +1,60 @@ +/* + * Copyright (c) 2004-2006 The Regents of The University of Michigan + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are + * met: redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer; + * redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution; + * neither the name of the copyright holders nor the names of its + * contributors may be used to endorse or promote products derived from + * this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + * Authors: Kevin Lim + */ + +#ifndef __CPU_O3_ALPHA_PARAMS_HH__ +#define __CPU_O3_ALPHA_PARAMS_HH__ + +#include "cpu/o3/cpu.hh" +#include "cpu/o3/params.hh" + +//Forward declarations +class AlphaDTB; +class AlphaITB; +class MemObject; +class Process; +class System; + +/** + * This file defines the parameters that will be used for the AlphaO3CPU. + * This must be defined externally so that the Impl can have a params class + * defined that it can pass to all of the individual stages. + */ + +class AlphaSimpleParams : public O3Params +{ + public: + +#if FULL_SYSTEM + AlphaITB *itb; + AlphaDTB *dtb; +#endif +}; + +#endif // __CPU_O3_ALPHA_PARAMS_HH__ diff --git a/src/cpu/o3/alpha/thread_context.cc b/src/cpu/o3/alpha/thread_context.cc new file mode 100755 index 000000000..4a02715bc --- /dev/null +++ b/src/cpu/o3/alpha/thread_context.cc @@ -0,0 +1,36 @@ +/* + * Copyright (c) 2004-2006 The Regents of The University of Michigan + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are + * met: redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer; + * redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution; + * neither the name of the copyright holders nor the names of its + * contributors may be used to endorse or promote products derived from + * this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + * Authors: Kevin Lim + * Korey Sewell + */ + +#include "cpu/o3/thread_context.hh" +#include "cpu/o3/thread_context_impl.hh" + +template class O3ThreadContext<AlphaSimpleImpl>; + diff --git a/src/cpu/o3/alpha/thread_context.hh b/src/cpu/o3/alpha/thread_context.hh new file mode 100644 index 000000000..70a09940f --- /dev/null +++ b/src/cpu/o3/alpha/thread_context.hh @@ -0,0 +1,88 @@ +/* + * Copyright (c) 2004-2006 The Regents of The University of Michigan + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are + * met: redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer; + * redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution; + * neither the name of the copyright holders nor the names of its + * contributors may be used to endorse or promote products derived from + * this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + * Authors: Kevin Lim + */ + +#include "arch/alpha/types.hh" +#include "cpu/o3/thread_context.hh" + +template <class Impl> +class AlphaTC : public O3ThreadContext<Impl> +{ + public: +#if FULL_SYSTEM + /** Returns a pointer to the ITB. */ + virtual AlphaITB *getITBPtr() { return this->cpu->itb; } + + /** Returns a pointer to the DTB. */ + virtual AlphaDTB *getDTBPtr() { return this->cpu->dtb; } + + /** Returns pointer to the quiesce event. */ + virtual EndQuiesceEvent *getQuiesceEvent() + { + return this->thread->quiesceEvent; + } + + /** Returns if the thread is currently in PAL mode, based on + * the PC's value. */ + virtual bool inPalMode() + { return TheISA::PcPAL(this->cpu->readPC(this->thread->readTid())); } +#endif + + virtual uint64_t readNextNPC() + { + panic("Alpha has no NextNPC!"); + return 0; + } + + virtual void setNextNPC(uint64_t val) + { + panic("Alpha has no NextNPC!"); + } + + virtual void changeRegFileContext(TheISA::RegContextParam param, + TheISA::RegContextVal val) + { panic("Not supported on Alpha!"); } + + + /** This function exits the thread context in the CPU and returns + * 1 if the CPU has no more active threads (meaning it's OK to exit); + * Used in syscall-emulation mode when a thread executes the 'exit' + * syscall. + */ + virtual int exit() + { + this->deallocate(); + + // If there are still threads executing in the system + if (this->cpu->numActiveThreads()) + return 0; // don't exit simulation + else + return 1; // exit simulation + } +}; diff --git a/src/cpu/o3/base_dyn_inst.cc b/src/cpu/o3/base_dyn_inst.cc new file mode 100644 index 000000000..0979c5c8f --- /dev/null +++ b/src/cpu/o3/base_dyn_inst.cc @@ -0,0 +1,39 @@ +/* + * Copyright (c) 2006 The Regents of The University of Michigan + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are + * met: redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer; + * redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution; + * neither the name of the copyright holders nor the names of its + * contributors may be used to endorse or promote products derived from + * this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + * Authors: Kevin Lim + */ + +#include "cpu/base_dyn_inst_impl.hh" +#include "cpu/o3/isa_specific.hh" + +// Explicit instantiation +template class BaseDynInst<O3CPUImpl>; + +template <> +int +BaseDynInst<O3CPUImpl>::instcount = 0; diff --git a/src/cpu/o3/bpred_unit.cc b/src/cpu/o3/bpred_unit.cc new file mode 100644 index 000000000..08fd4e8ea --- /dev/null +++ b/src/cpu/o3/bpred_unit.cc @@ -0,0 +1,34 @@ +/* + * Copyright (c) 2004-2006 The Regents of The University of Michigan + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are + * met: redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer; + * redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution; + * neither the name of the copyright holders nor the names of its + * contributors may be used to endorse or promote products derived from + * this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + * Authors: Kevin Lim + */ + +#include "cpu/o3/bpred_unit_impl.hh" +#include "cpu/o3/isa_specific.hh" + +template class BPredUnit<O3CPUImpl>; diff --git a/src/cpu/o3/bpred_unit.hh b/src/cpu/o3/bpred_unit.hh new file mode 100644 index 000000000..3c4c8e478 --- /dev/null +++ b/src/cpu/o3/bpred_unit.hh @@ -0,0 +1,256 @@ +/* + * Copyright (c) 2004-2005 The Regents of The University of Michigan + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are + * met: redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer; + * redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution; + * neither the name of the copyright holders nor the names of its + * contributors may be used to endorse or promote products derived from + * this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + * Authors: Kevin Lim + */ + +#ifndef __CPU_O3_BPRED_UNIT_HH__ +#define __CPU_O3_BPRED_UNIT_HH__ + +#include "base/statistics.hh" +#include "cpu/inst_seq.hh" + +#include "cpu/o3/2bit_local_pred.hh" +#include "cpu/o3/btb.hh" +#include "cpu/o3/ras.hh" +#include "cpu/o3/tournament_pred.hh" + +#include "sim/host.hh" + +#include <list> + +/** + * Basically a wrapper class to hold both the branch predictor + * and the BTB. + */ +template<class Impl> +class BPredUnit +{ + private: + typedef typename Impl::Params Params; + typedef typename Impl::DynInstPtr DynInstPtr; + + enum PredType { + Local, + Tournament + }; + + PredType predictor; + + public: + + /** + * @param params The params object, that has the size of the BP and BTB. + */ + BPredUnit(Params *params); + + /** + * Registers statistics. + */ + void regStats(); + + void switchOut(); + + void takeOverFrom(); + + /** + * Predicts whether or not the instruction is a taken branch, and the + * target of the branch if it is taken. + * @param inst The branch instruction. + * @param PC The predicted PC is passed back through this parameter. + * @param tid The thread id. + * @return Returns if the branch is taken or not. + */ + bool predict(DynInstPtr &inst, Addr &PC, unsigned tid); + + // @todo: Rename this function. + void BPUncond(void * &bp_history); + + /** + * Tells the branch predictor to commit any updates until the given + * sequence number. + * @param done_sn The sequence number to commit any older updates up until. + * @param tid The thread id. + */ + void update(const InstSeqNum &done_sn, unsigned tid); + + /** + * Squashes all outstanding updates until a given sequence number. + * @param squashed_sn The sequence number to squash any younger updates up + * until. + * @param tid The thread id. + */ + void squash(const InstSeqNum &squashed_sn, unsigned tid); + + /** + * Squashes all outstanding updates until a given sequence number, and + * corrects that sn's update with the proper address and taken/not taken. + * @param squashed_sn The sequence number to squash any younger updates up + * until. + * @param corr_target The correct branch target. + * @param actually_taken The correct branch direction. + * @param tid The thread id. + */ + void squash(const InstSeqNum &squashed_sn, const Addr &corr_target, + bool actually_taken, unsigned tid); + + /** + * @param bp_history Pointer to the history object. The predictor + * will need to update any state and delete the object. + */ + void BPSquash(void *bp_history); + + /** + * Looks up a given PC in the BP to see if it is taken or not taken. + * @param inst_PC The PC to look up. + * @param bp_history Pointer that will be set to an object that + * has the branch predictor state associated with the lookup. + * @return Whether the branch is taken or not taken. + */ + bool BPLookup(Addr &inst_PC, void * &bp_history); + + /** + * Looks up a given PC in the BTB to see if a matching entry exists. + * @param inst_PC The PC to look up. + * @return Whether the BTB contains the given PC. + */ + bool BTBValid(Addr &inst_PC) + { return BTB.valid(inst_PC, 0); } + + /** + * Looks up a given PC in the BTB to get the predicted target. + * @param inst_PC The PC to look up. + * @return The address of the target of the branch. + */ + Addr BTBLookup(Addr &inst_PC) + { return BTB.lookup(inst_PC, 0); } + + /** + * Updates the BP with taken/not taken information. + * @param inst_PC The branch's PC that will be updated. + * @param taken Whether the branch was taken or not taken. + * @param bp_history Pointer to the branch predictor state that is + * associated with the branch lookup that is being updated. + * @todo Make this update flexible enough to handle a global predictor. + */ + void BPUpdate(Addr &inst_PC, bool taken, void *bp_history); + + /** + * Updates the BTB with the target of a branch. + * @param inst_PC The branch's PC that will be updated. + * @param target_PC The branch's target that will be added to the BTB. + */ + void BTBUpdate(Addr &inst_PC, Addr &target_PC) + { BTB.update(inst_PC, target_PC,0); } + + void dump(); + + private: + struct PredictorHistory { + /** + * Makes a predictor history struct that contains any + * information needed to update the predictor, BTB, and RAS. + */ + PredictorHistory(const InstSeqNum &seq_num, const Addr &inst_PC, + const bool pred_taken, void *bp_history, + const unsigned _tid) + : seqNum(seq_num), PC(inst_PC), RASTarget(0), + RASIndex(0), tid(_tid), predTaken(pred_taken), usedRAS(0), + wasCall(0), bpHistory(bp_history) + { } + + /** The sequence number for the predictor history entry. */ + InstSeqNum seqNum; + + /** The PC associated with the sequence number. */ + Addr PC; + + /** The RAS target (only valid if a return). */ + Addr RASTarget; + + /** The RAS index of the instruction (only valid if a call). */ + unsigned RASIndex; + + /** The thread id. */ + unsigned tid; + + /** Whether or not it was predicted taken. */ + bool predTaken; + + /** Whether or not the RAS was used. */ + bool usedRAS; + + /** Whether or not the instruction was a call. */ + bool wasCall; + + /** Pointer to the history object passed back from the branch + * predictor. It is used to update or restore state of the + * branch predictor. + */ + void *bpHistory; + }; + + typedef std::list<PredictorHistory> History; + + /** + * The per-thread predictor history. This is used to update the predictor + * as instructions are committed, or restore it to the proper state after + * a squash. + */ + History predHist[Impl::MaxThreads]; + + /** The local branch predictor. */ + LocalBP *localBP; + + /** The tournament branch predictor. */ + TournamentBP *tournamentBP; + + /** The BTB. */ + DefaultBTB BTB; + + /** The per-thread return address stack. */ + ReturnAddrStack RAS[Impl::MaxThreads]; + + /** Stat for number of BP lookups. */ + Stats::Scalar<> lookups; + /** Stat for number of conditional branches predicted. */ + Stats::Scalar<> condPredicted; + /** Stat for number of conditional branches predicted incorrectly. */ + Stats::Scalar<> condIncorrect; + /** Stat for number of BTB lookups. */ + Stats::Scalar<> BTBLookups; + /** Stat for number of BTB hits. */ + Stats::Scalar<> BTBHits; + /** Stat for number of times the BTB is correct. */ + Stats::Scalar<> BTBCorrect; + /** Stat for number of times the RAS is used to get a target. */ + Stats::Scalar<> usedRAS; + /** Stat for number of times the RAS is incorrect. */ + Stats::Scalar<> RASIncorrect; +}; + +#endif // __CPU_O3_BPRED_UNIT_HH__ diff --git a/src/cpu/o3/bpred_unit_impl.hh b/src/cpu/o3/bpred_unit_impl.hh new file mode 100644 index 000000000..477c8e4cb --- /dev/null +++ b/src/cpu/o3/bpred_unit_impl.hh @@ -0,0 +1,413 @@ +/* + * Copyright (c) 2004-2005 The Regents of The University of Michigan + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are + * met: redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer; + * redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution; + * neither the name of the copyright holders nor the names of its + * contributors may be used to endorse or promote products derived from + * this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + * Authors: Kevin Lim + */ + +#include "arch/types.hh" +#include "arch/isa_traits.hh" +#include "base/trace.hh" +#include "base/traceflags.hh" +#include "cpu/o3/bpred_unit.hh" + +template<class Impl> +BPredUnit<Impl>::BPredUnit(Params *params) + : BTB(params->BTBEntries, + params->BTBTagSize, + params->instShiftAmt) +{ + // Setup the selected predictor. + if (params->predType == "local") { + localBP = new LocalBP(params->localPredictorSize, + params->localCtrBits, + params->instShiftAmt); + predictor = Local; + } else if (params->predType == "tournament") { + tournamentBP = new TournamentBP(params->localPredictorSize, + params->localCtrBits, + params->localHistoryTableSize, + params->localHistoryBits, + params->globalPredictorSize, + params->globalHistoryBits, + params->globalCtrBits, + params->choicePredictorSize, + params->choiceCtrBits, + params->instShiftAmt); + predictor = Tournament; + } else { + fatal("Invalid BP selected!"); + } + + for (int i=0; i < Impl::MaxThreads; i++) + RAS[i].init(params->RASSize); +} + +template <class Impl> +void +BPredUnit<Impl>::regStats() +{ + lookups + .name(name() + ".BPredUnit.lookups") + .desc("Number of BP lookups") + ; + + condPredicted + .name(name() + ".BPredUnit.condPredicted") + .desc("Number of conditional branches predicted") + ; + + condIncorrect + .name(name() + ".BPredUnit.condIncorrect") + .desc("Number of conditional branches incorrect") + ; + + BTBLookups + .name(name() + ".BPredUnit.BTBLookups") + .desc("Number of BTB lookups") + ; + + BTBHits + .name(name() + ".BPredUnit.BTBHits") + .desc("Number of BTB hits") + ; + + BTBCorrect + .name(name() + ".BPredUnit.BTBCorrect") + .desc("Number of correct BTB predictions (this stat may not " + "work properly.") + ; + + usedRAS + .name(name() + ".BPredUnit.usedRAS") + .desc("Number of times the RAS was used to get a target.") + ; + + RASIncorrect + .name(name() + ".BPredUnit.RASInCorrect") + .desc("Number of incorrect RAS predictions.") + ; +} + +template <class Impl> +void +BPredUnit<Impl>::switchOut() +{ + // Clear any state upon switch out. + for (int i = 0; i < Impl::MaxThreads; ++i) { + squash(0, i); + } +} + +template <class Impl> +void +BPredUnit<Impl>::takeOverFrom() +{ + // Can reset all predictor state, but it's not necessarily better + // than leaving it be. +/* + for (int i = 0; i < Impl::MaxThreads; ++i) + RAS[i].reset(); + + BP.reset(); + BTB.reset(); +*/ +} + +template <class Impl> +bool +BPredUnit<Impl>::predict(DynInstPtr &inst, Addr &PC, unsigned tid) +{ + // See if branch predictor predicts taken. + // If so, get its target addr either from the BTB or the RAS. + // Save off record of branch stuff so the RAS can be fixed + // up once it's done. + + using TheISA::MachInst; + + bool pred_taken = false; + Addr target; + + ++lookups; + + void *bp_history = NULL; + + if (inst->isUncondCtrl()) { + DPRINTF(Fetch, "BranchPred: [tid:%i]: Unconditional control.\n", tid); + pred_taken = true; + // Tell the BP there was an unconditional branch. + BPUncond(bp_history); + } else { + ++condPredicted; + + pred_taken = BPLookup(PC, bp_history); + + DPRINTF(Fetch, "BranchPred: [tid:%i]: Branch predictor predicted %i " + "for PC %#x\n", + tid, pred_taken, inst->readPC()); + } + + PredictorHistory predict_record(inst->seqNum, PC, pred_taken, + bp_history, tid); + + // Now lookup in the BTB or RAS. + if (pred_taken) { + if (inst->isReturn()) { + ++usedRAS; + + // If it's a function return call, then look up the address + // in the RAS. + target = RAS[tid].top(); + + // Record the top entry of the RAS, and its index. + predict_record.usedRAS = true; + predict_record.RASIndex = RAS[tid].topIdx(); + predict_record.RASTarget = target; + + assert(predict_record.RASIndex < 16); + + RAS[tid].pop(); + + DPRINTF(Fetch, "BranchPred: [tid:%i]: Instruction %#x is a return, " + "RAS predicted target: %#x, RAS index: %i.\n", + tid, inst->readPC(), target, predict_record.RASIndex); + } else { + ++BTBLookups; + + if (inst->isCall()) { +#if ISA_HAS_DELAY_SLOT + Addr ras_pc = PC + (2 * sizeof(MachInst)); // Next Next PC +#else + Addr ras_pc = PC + sizeof(MachInst); // Next PC +#endif + RAS[tid].push(ras_pc); + + // Record that it was a call so that the top RAS entry can + // be popped off if the speculation is incorrect. + predict_record.wasCall = true; + + DPRINTF(Fetch, "BranchPred: [tid:%i]: Instruction %#x was a call" + ", adding %#x to the RAS index: %i.\n", + tid, inst->readPC(), ras_pc, RAS[tid].topIdx()); + } + + if (BTB.valid(PC, tid)) { + ++BTBHits; + + // If it's not a return, use the BTB to get the target addr. + target = BTB.lookup(PC, tid); + + DPRINTF(Fetch, "BranchPred: [tid:%i]: Instruction %#x predicted" + " target is %#x.\n", + tid, inst->readPC(), target); + + } else { + DPRINTF(Fetch, "BranchPred: [tid:%i]: BTB doesn't have a " + "valid entry.\n",tid); + pred_taken = false; + } + + } + } + + if (pred_taken) { + // Set the PC and the instruction's predicted target. + PC = target; + inst->setPredTarg(target); + } else { + PC = PC + sizeof(MachInst); + inst->setPredTarg(PC); + } + + predHist[tid].push_front(predict_record); + + DPRINTF(Fetch, "[tid:%i]: predHist.size(): %i\n", tid, predHist[tid].size()); + + return pred_taken; +} + +template <class Impl> +void +BPredUnit<Impl>::update(const InstSeqNum &done_sn, unsigned tid) +{ + DPRINTF(Fetch, "BranchPred: [tid:%i]: Commiting branches until " + "[sn:%lli].\n", tid, done_sn); + + while (!predHist[tid].empty() && + predHist[tid].back().seqNum <= done_sn) { + // Update the branch predictor with the correct results. + BPUpdate(predHist[tid].back().PC, + predHist[tid].back().predTaken, + predHist[tid].back().bpHistory); + + predHist[tid].pop_back(); + } +} + +template <class Impl> +void +BPredUnit<Impl>::squash(const InstSeqNum &squashed_sn, unsigned tid) +{ + History &pred_hist = predHist[tid]; + + while (!pred_hist.empty() && + pred_hist.front().seqNum > squashed_sn) { + if (pred_hist.front().usedRAS) { + DPRINTF(Fetch, "BranchPred: [tid:%i]: Restoring top of RAS to: %i," + " target: %#x.\n", + tid, + pred_hist.front().RASIndex, + pred_hist.front().RASTarget); + + RAS[tid].restore(pred_hist.front().RASIndex, + pred_hist.front().RASTarget); + } else if (pred_hist.front().wasCall) { + DPRINTF(Fetch, "BranchPred: [tid:%i]: Removing speculative entry " + "added to the RAS.\n",tid); + + RAS[tid].pop(); + } + + // This call should delete the bpHistory. + BPSquash(pred_hist.front().bpHistory); + + pred_hist.pop_front(); + } + +} + +template <class Impl> +void +BPredUnit<Impl>::squash(const InstSeqNum &squashed_sn, + const Addr &corr_target, + const bool actually_taken, + unsigned tid) +{ + // Now that we know that a branch was mispredicted, we need to undo + // all the branches that have been seen up until this branch and + // fix up everything. + + History &pred_hist = predHist[tid]; + + ++condIncorrect; + + DPRINTF(Fetch, "BranchPred: [tid:%i]: Squashing from sequence number %i, " + "setting target to %#x.\n", + tid, squashed_sn, corr_target); + + squash(squashed_sn, tid); + + // If there's a squash due to a syscall, there may not be an entry + // corresponding to the squash. In that case, don't bother trying to + // fix up the entry. + if (!pred_hist.empty()) { + assert(pred_hist.front().seqNum == squashed_sn); + if (pred_hist.front().usedRAS) { + ++RASIncorrect; + } + + BPUpdate(pred_hist.front().PC, actually_taken, + pred_hist.front().bpHistory); + + BTB.update(pred_hist.front().PC, corr_target, tid); + pred_hist.pop_front(); + } +} + +template <class Impl> +void +BPredUnit<Impl>::BPUncond(void * &bp_history) +{ + // Only the tournament predictor cares about unconditional branches. + if (predictor == Tournament) { + tournamentBP->uncondBr(bp_history); + } +} + +template <class Impl> +void +BPredUnit<Impl>::BPSquash(void *bp_history) +{ + if (predictor == Local) { + localBP->squash(bp_history); + } else if (predictor == Tournament) { + tournamentBP->squash(bp_history); + } else { + panic("Predictor type is unexpected value!"); + } +} + +template <class Impl> +bool +BPredUnit<Impl>::BPLookup(Addr &inst_PC, void * &bp_history) +{ + if (predictor == Local) { + return localBP->lookup(inst_PC, bp_history); + } else if (predictor == Tournament) { + return tournamentBP->lookup(inst_PC, bp_history); + } else { + panic("Predictor type is unexpected value!"); + } +} + +template <class Impl> +void +BPredUnit<Impl>::BPUpdate(Addr &inst_PC, bool taken, void *bp_history) +{ + if (predictor == Local) { + localBP->update(inst_PC, taken, bp_history); + } else if (predictor == Tournament) { + tournamentBP->update(inst_PC, taken, bp_history); + } else { + panic("Predictor type is unexpected value!"); + } +} + +template <class Impl> +void +BPredUnit<Impl>::dump() +{ + typename History::iterator pred_hist_it; + + for (int i = 0; i < Impl::MaxThreads; ++i) { + if (!predHist[i].empty()) { + pred_hist_it = predHist[i].begin(); + + cprintf("predHist[%i].size(): %i\n", i, predHist[i].size()); + + while (pred_hist_it != predHist[i].end()) { + cprintf("[sn:%lli], PC:%#x, tid:%i, predTaken:%i, " + "bpHistory:%#x\n", + (*pred_hist_it).seqNum, (*pred_hist_it).PC, + (*pred_hist_it).tid, (*pred_hist_it).predTaken, + (*pred_hist_it).bpHistory); + pred_hist_it++; + } + + cprintf("\n"); + } + } +} diff --git a/src/cpu/o3/btb.cc b/src/cpu/o3/btb.cc new file mode 100644 index 000000000..93d6ee768 --- /dev/null +++ b/src/cpu/o3/btb.cc @@ -0,0 +1,134 @@ +/* + * Copyright (c) 2004-2005 The Regents of The University of Michigan + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are + * met: redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer; + * redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution; + * neither the name of the copyright holders nor the names of its + * contributors may be used to endorse or promote products derived from + * this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + * Authors: Kevin Lim + */ + +#include "base/intmath.hh" +#include "base/trace.hh" +#include "cpu/o3/btb.hh" + +DefaultBTB::DefaultBTB(unsigned _numEntries, + unsigned _tagBits, + unsigned _instShiftAmt) + : numEntries(_numEntries), + tagBits(_tagBits), + instShiftAmt(_instShiftAmt) +{ + DPRINTF(Fetch, "BTB: Creating BTB object.\n"); + + if (!isPowerOf2(numEntries)) { + fatal("BTB entries is not a power of 2!"); + } + + btb.resize(numEntries); + + for (int i = 0; i < numEntries; ++i) { + btb[i].valid = false; + } + + idxMask = numEntries - 1; + + tagMask = (1 << tagBits) - 1; + + tagShiftAmt = instShiftAmt + floorLog2(numEntries); +} + +void +DefaultBTB::reset() +{ + for (int i = 0; i < numEntries; ++i) { + btb[i].valid = false; + } +} + +inline +unsigned +DefaultBTB::getIndex(const Addr &inst_PC) +{ + // Need to shift PC over by the word offset. + return (inst_PC >> instShiftAmt) & idxMask; +} + +inline +Addr +DefaultBTB::getTag(const Addr &inst_PC) +{ + return (inst_PC >> tagShiftAmt) & tagMask; +} + +bool +DefaultBTB::valid(const Addr &inst_PC, unsigned tid) +{ + unsigned btb_idx = getIndex(inst_PC); + + Addr inst_tag = getTag(inst_PC); + + assert(btb_idx < numEntries); + + if (btb[btb_idx].valid + && inst_tag == btb[btb_idx].tag + && btb[btb_idx].tid == tid) { + return true; + } else { + return false; + } +} + +// @todo Create some sort of return struct that has both whether or not the +// address is valid, and also the address. For now will just use addr = 0 to +// represent invalid entry. +Addr +DefaultBTB::lookup(const Addr &inst_PC, unsigned tid) +{ + unsigned btb_idx = getIndex(inst_PC); + + Addr inst_tag = getTag(inst_PC); + + assert(btb_idx < numEntries); + + if (btb[btb_idx].valid + && inst_tag == btb[btb_idx].tag + && btb[btb_idx].tid == tid) { + return btb[btb_idx].target; + } else { + return 0; + } +} + +void +DefaultBTB::update(const Addr &inst_PC, const Addr &target, unsigned tid) +{ + unsigned btb_idx = getIndex(inst_PC); + + assert(btb_idx < numEntries); + + btb[btb_idx].tid = tid; + btb[btb_idx].valid = true; + btb[btb_idx].target = target; + btb[btb_idx].tag = getTag(inst_PC); +} diff --git a/src/cpu/o3/btb.hh b/src/cpu/o3/btb.hh new file mode 100644 index 000000000..3c4899e89 --- /dev/null +++ b/src/cpu/o3/btb.hh @@ -0,0 +1,129 @@ +/* + * Copyright (c) 2004-2005 The Regents of The University of Michigan + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are + * met: redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer; + * redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution; + * neither the name of the copyright holders nor the names of its + * contributors may be used to endorse or promote products derived from + * this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + * Authors: Kevin Lim + */ + +#ifndef __CPU_O3_BTB_HH__ +#define __CPU_O3_BTB_HH__ + +#include "base/misc.hh" +#include "sim/host.hh" + +class DefaultBTB +{ + private: + struct BTBEntry + { + BTBEntry() + : tag(0), target(0), valid(false) + { + } + + /** The entry's tag. */ + Addr tag; + + /** The entry's target. */ + Addr target; + + /** The entry's thread id. */ + unsigned tid; + + /** Whether or not the entry is valid. */ + bool valid; + }; + + public: + /** Creates a BTB with the given number of entries, number of bits per + * tag, and instruction offset amount. + * @param numEntries Number of entries for the BTB. + * @param tagBits Number of bits for each tag in the BTB. + * @param instShiftAmt Offset amount for instructions to ignore alignment. + */ + DefaultBTB(unsigned numEntries, unsigned tagBits, + unsigned instShiftAmt); + + void reset(); + + /** Looks up an address in the BTB. Must call valid() first on the address. + * @param inst_PC The address of the branch to look up. + * @param tid The thread id. + * @return Returns the target of the branch. + */ + Addr lookup(const Addr &inst_PC, unsigned tid); + + /** Checks if a branch is in the BTB. + * @param inst_PC The address of the branch to look up. + * @param tid The thread id. + * @return Whether or not the branch exists in the BTB. + */ + bool valid(const Addr &inst_PC, unsigned tid); + + /** Updates the BTB with the target of a branch. + * @param inst_PC The address of the branch being updated. + * @param target_PC The target address of the branch. + * @param tid The thread id. + */ + void update(const Addr &inst_PC, const Addr &target_PC, + unsigned tid); + + private: + /** Returns the index into the BTB, based on the branch's PC. + * @param inst_PC The branch to look up. + * @return Returns the index into the BTB. + */ + inline unsigned getIndex(const Addr &inst_PC); + + /** Returns the tag bits of a given address. + * @param inst_PC The branch's address. + * @return Returns the tag bits. + */ + inline Addr getTag(const Addr &inst_PC); + + /** The actual BTB. */ + std::vector<BTBEntry> btb; + + /** The number of entries in the BTB. */ + unsigned numEntries; + + /** The index mask. */ + unsigned idxMask; + + /** The number of tag bits per entry. */ + unsigned tagBits; + + /** The tag mask. */ + unsigned tagMask; + + /** Number of bits to shift PC when calculating index. */ + unsigned instShiftAmt; + + /** Number of bits to shift PC when calculating tag. */ + unsigned tagShiftAmt; +}; + +#endif // __CPU_O3_BTB_HH__ diff --git a/src/cpu/o3/checker_builder.cc b/src/cpu/o3/checker_builder.cc new file mode 100644 index 000000000..ad83ec57a --- /dev/null +++ b/src/cpu/o3/checker_builder.cc @@ -0,0 +1,170 @@ +/* + * Copyright (c) 2006 The Regents of The University of Michigan + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are + * met: redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer; + * redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution; + * neither the name of the copyright holders nor the names of its + * contributors may be used to endorse or promote products derived from + * this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + * Authors: Kevin Lim + */ + +#include <string> + +#include "cpu/checker/cpu_impl.hh" +#include "cpu/inst_seq.hh" +#include "cpu/o3/alpha/dyn_inst.hh" +#include "cpu/o3/alpha/impl.hh" +#include "sim/builder.hh" +#include "sim/process.hh" +#include "sim/sim_object.hh" + +class MemObject; + +template +class Checker<RefCountingPtr<AlphaDynInst<AlphaSimpleImpl> > >; + +/** + * Specific non-templated derived class used for SimObject configuration. + */ +class O3Checker : public Checker<RefCountingPtr<AlphaDynInst<AlphaSimpleImpl> > > +{ + public: + O3Checker(Params *p) + : Checker<RefCountingPtr<AlphaDynInst<AlphaSimpleImpl> > >(p) + { } +}; + +//////////////////////////////////////////////////////////////////////// +// +// CheckerCPU Simulation Object +// +BEGIN_DECLARE_SIM_OBJECT_PARAMS(O3Checker) + + Param<Counter> max_insts_any_thread; + Param<Counter> max_insts_all_threads; + Param<Counter> max_loads_any_thread; + Param<Counter> max_loads_all_threads; + Param<Counter> stats_reset_inst; + Param<Tick> progress_interval; + +#if FULL_SYSTEM + SimObjectParam<AlphaITB *> itb; + SimObjectParam<AlphaDTB *> dtb; + SimObjectParam<System *> system; + Param<int> cpu_id; + Param<Tick> profile; +#else + SimObjectParam<Process *> workload; +#endif // FULL_SYSTEM + Param<int> clock; + + Param<bool> defer_registration; + Param<bool> exitOnError; + Param<bool> updateOnError; + Param<bool> warnOnlyOnLoadError; + Param<bool> function_trace; + Param<Tick> function_trace_start; + +END_DECLARE_SIM_OBJECT_PARAMS(O3Checker) + +BEGIN_INIT_SIM_OBJECT_PARAMS(O3Checker) + + INIT_PARAM(max_insts_any_thread, + "terminate when any thread reaches this inst count"), + INIT_PARAM(max_insts_all_threads, + "terminate when all threads have reached this inst count"), + INIT_PARAM(max_loads_any_thread, + "terminate when any thread reaches this load count"), + INIT_PARAM(max_loads_all_threads, + "terminate when all threads have reached this load count"), + INIT_PARAM(stats_reset_inst, + "blah"), + INIT_PARAM_DFLT(progress_interval, "CPU Progress Interval", 0), + +#if FULL_SYSTEM + INIT_PARAM(itb, "Instruction TLB"), + INIT_PARAM(dtb, "Data TLB"), + INIT_PARAM(system, "system object"), + INIT_PARAM(cpu_id, "processor ID"), + INIT_PARAM(profile, ""), +#else + INIT_PARAM(workload, "processes to run"), +#endif // FULL_SYSTEM + + INIT_PARAM(clock, "clock speed"), + + INIT_PARAM(defer_registration, "defer system registration (for sampling)"), + INIT_PARAM(exitOnError, "exit on error"), + INIT_PARAM(updateOnError, "Update the checker with the main CPU's state on error"), + INIT_PARAM_DFLT(warnOnlyOnLoadError, "warn, but don't exit, if a load " + "result errors", false), + INIT_PARAM(function_trace, "Enable function trace"), + INIT_PARAM(function_trace_start, "Cycle to start function trace") + +END_INIT_SIM_OBJECT_PARAMS(O3Checker) + + +CREATE_SIM_OBJECT(O3Checker) +{ + O3Checker::Params *params = new O3Checker::Params(); + params->name = getInstanceName(); + params->numberOfThreads = 1; + params->max_insts_any_thread = 0; + params->max_insts_all_threads = 0; + params->max_loads_any_thread = 0; + params->max_loads_all_threads = 0; + params->stats_reset_inst = 0; + params->exitOnError = exitOnError; + params->updateOnError = updateOnError; + params->warnOnlyOnLoadError = warnOnlyOnLoadError; + params->deferRegistration = defer_registration; + params->functionTrace = function_trace; + params->functionTraceStart = function_trace_start; + params->clock = clock; + // Hack to touch all parameters. Consider not deriving Checker + // from BaseCPU..it's not really a CPU in the end. + Counter temp; + temp = max_insts_any_thread; + temp = max_insts_all_threads; + temp = max_loads_any_thread; + temp = max_loads_all_threads; + temp = stats_reset_inst; + Tick temp2 = progress_interval; + params->progress_interval = 0; + temp2++; + +#if FULL_SYSTEM + params->itb = itb; + params->dtb = dtb; + params->system = system; + params->cpu_id = cpu_id; + params->profile = profile; +#else + params->process = workload; +#endif + + O3Checker *cpu = new O3Checker(params); + return cpu; +} + +REGISTER_SIM_OBJECT("O3Checker", O3Checker) diff --git a/src/cpu/o3/comm.hh b/src/cpu/o3/comm.hh new file mode 100644 index 000000000..aa58fc20e --- /dev/null +++ b/src/cpu/o3/comm.hh @@ -0,0 +1,202 @@ +/* + * Copyright (c) 2004-2006 The Regents of The University of Michigan + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are + * met: redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer; + * redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution; + * neither the name of the copyright holders nor the names of its + * contributors may be used to endorse or promote products derived from + * this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + * Authors: Kevin Lim + */ + +#ifndef __CPU_O3_COMM_HH__ +#define __CPU_O3_COMM_HH__ + +#include <vector> + +#include "sim/faults.hh" +#include "cpu/inst_seq.hh" +#include "sim/host.hh" + +// Typedef for physical register index type. Although the Impl would be the +// most likely location for this, there are a few classes that need this +// typedef yet are not templated on the Impl. For now it will be defined here. +typedef short int PhysRegIndex; + +/** Struct that defines the information passed from fetch to decode. */ +template<class Impl> +struct DefaultFetchDefaultDecode { + typedef typename Impl::DynInstPtr DynInstPtr; + + int size; + + DynInstPtr insts[Impl::MaxWidth]; + Fault fetchFault; + InstSeqNum fetchFaultSN; + bool clearFetchFault; +}; + +/** Struct that defines the information passed from decode to rename. */ +template<class Impl> +struct DefaultDecodeDefaultRename { + typedef typename Impl::DynInstPtr DynInstPtr; + + int size; + + DynInstPtr insts[Impl::MaxWidth]; +}; + +/** Struct that defines the information passed from rename to IEW. */ +template<class Impl> +struct DefaultRenameDefaultIEW { + typedef typename Impl::DynInstPtr DynInstPtr; + + int size; + + DynInstPtr insts[Impl::MaxWidth]; +}; + +/** Struct that defines the information passed from IEW to commit. */ +template<class Impl> +struct DefaultIEWDefaultCommit { + typedef typename Impl::DynInstPtr DynInstPtr; + + int size; + + DynInstPtr insts[Impl::MaxWidth]; + + bool squash[Impl::MaxThreads]; + bool branchMispredict[Impl::MaxThreads]; + bool branchTaken[Impl::MaxThreads]; + bool condDelaySlotBranch[Impl::MaxThreads]; + uint64_t mispredPC[Impl::MaxThreads]; + uint64_t nextPC[Impl::MaxThreads]; + InstSeqNum squashedSeqNum[Impl::MaxThreads]; + + bool includeSquashInst[Impl::MaxThreads]; +}; + +template<class Impl> +struct IssueStruct { + typedef typename Impl::DynInstPtr DynInstPtr; + + int size; + + DynInstPtr insts[Impl::MaxWidth]; +}; + +/** Struct that defines all backwards communication. */ +template<class Impl> +struct TimeBufStruct { + struct decodeComm { + bool squash; + bool predIncorrect; + uint64_t branchAddr; + + InstSeqNum doneSeqNum; + InstSeqNum bdelayDoneSeqNum; + + // @todo: Might want to package this kind of branch stuff into a single + // struct as it is used pretty frequently. + bool branchMispredict; + bool branchTaken; + uint64_t mispredPC; + uint64_t nextPC; + + unsigned branchCount; + }; + + decodeComm decodeInfo[Impl::MaxThreads]; + + struct renameComm { + }; + + renameComm renameInfo[Impl::MaxThreads]; + + struct iewComm { + // Also eventually include skid buffer space. + bool usedIQ; + unsigned freeIQEntries; + bool usedLSQ; + unsigned freeLSQEntries; + + unsigned iqCount; + unsigned ldstqCount; + + unsigned dispatched; + unsigned dispatchedToLSQ; + }; + + iewComm iewInfo[Impl::MaxThreads]; + + struct commitComm { + bool usedROB; + unsigned freeROBEntries; + bool emptyROB; + + bool squash; + bool robSquashing; + + bool branchMispredict; + bool branchTaken; + uint64_t mispredPC; + uint64_t nextPC; + + // Represents the instruction that has either been retired or + // squashed. Similar to having a single bus that broadcasts the + // retired or squashed sequence number. + InstSeqNum doneSeqNum; + + InstSeqNum bdelayDoneSeqNum; + bool squashDelaySlot; + + //Just in case we want to do a commit/squash on a cycle + //(necessary for multiple ROBs?) + bool commitInsts; + InstSeqNum squashSeqNum; + + // Communication specifically to the IQ to tell the IQ that it can + // schedule a non-speculative instruction. + InstSeqNum nonSpecSeqNum; + + // Hack for now to send back an uncached access to the IEW stage. + typedef typename Impl::DynInstPtr DynInstPtr; + bool uncached; + DynInstPtr uncachedLoad; + + bool interruptPending; + bool clearInterrupt; + }; + + commitComm commitInfo[Impl::MaxThreads]; + + bool decodeBlock[Impl::MaxThreads]; + bool decodeUnblock[Impl::MaxThreads]; + bool renameBlock[Impl::MaxThreads]; + bool renameUnblock[Impl::MaxThreads]; + bool iewBlock[Impl::MaxThreads]; + bool iewUnblock[Impl::MaxThreads]; + bool commitBlock[Impl::MaxThreads]; + bool commitUnblock[Impl::MaxThreads]; +}; + +#endif //__CPU_O3_COMM_HH__ diff --git a/src/cpu/o3/commit.cc b/src/cpu/o3/commit.cc new file mode 100644 index 000000000..637d59f52 --- /dev/null +++ b/src/cpu/o3/commit.cc @@ -0,0 +1,34 @@ +/* + * Copyright (c) 2004-2005 The Regents of The University of Michigan + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are + * met: redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer; + * redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution; + * neither the name of the copyright holders nor the names of its + * contributors may be used to endorse or promote products derived from + * this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + * Authors: Kevin Lim + */ + +#include "cpu/o3/isa_specific.hh" +#include "cpu/o3/commit_impl.hh" + +template class DefaultCommit<O3CPUImpl>; diff --git a/src/cpu/o3/commit.hh b/src/cpu/o3/commit.hh new file mode 100644 index 000000000..7575783f7 --- /dev/null +++ b/src/cpu/o3/commit.hh @@ -0,0 +1,455 @@ +/* + * Copyright (c) 2004-2006 The Regents of The University of Michigan + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are + * met: redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer; + * redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution; + * neither the name of the copyright holders nor the names of its + * contributors may be used to endorse or promote products derived from + * this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + * Authors: Kevin Lim + * Korey Sewell + */ + +#ifndef __CPU_O3_COMMIT_HH__ +#define __CPU_O3_COMMIT_HH__ + +#include "base/statistics.hh" +#include "base/timebuf.hh" +#include "cpu/exetrace.hh" +#include "cpu/inst_seq.hh" + +template <class> +class O3ThreadState; + +/** + * DefaultCommit handles single threaded and SMT commit. Its width is + * specified by the parameters; each cycle it tries to commit that + * many instructions. The SMT policy decides which thread it tries to + * commit instructions from. Non- speculative instructions must reach + * the head of the ROB before they are ready to execute; once they + * reach the head, commit will broadcast the instruction's sequence + * number to the previous stages so that they can issue/ execute the + * instruction. Only one non-speculative instruction is handled per + * cycle. Commit is responsible for handling all back-end initiated + * redirects. It receives the redirect, and then broadcasts it to all + * stages, indicating the sequence number they should squash until, + * and any necessary branch misprediction information as well. It + * priortizes redirects by instruction's age, only broadcasting a + * redirect if it corresponds to an instruction that should currently + * be in the ROB. This is done by tracking the sequence number of the + * youngest instruction in the ROB, which gets updated to any + * squashing instruction's sequence number, and only broadcasting a + * redirect if it corresponds to an older instruction. Commit also + * supports multiple cycle squashing, to model a ROB that can only + * remove a certain number of instructions per cycle. + */ +template<class Impl> +class DefaultCommit +{ + public: + // Typedefs from the Impl. + typedef typename Impl::O3CPU O3CPU; + typedef typename Impl::DynInstPtr DynInstPtr; + typedef typename Impl::Params Params; + typedef typename Impl::CPUPol CPUPol; + + typedef typename CPUPol::RenameMap RenameMap; + typedef typename CPUPol::ROB ROB; + + typedef typename CPUPol::TimeStruct TimeStruct; + typedef typename CPUPol::FetchStruct FetchStruct; + typedef typename CPUPol::IEWStruct IEWStruct; + typedef typename CPUPol::RenameStruct RenameStruct; + + typedef typename CPUPol::Fetch Fetch; + typedef typename CPUPol::IEW IEW; + + typedef O3ThreadState<Impl> Thread; + + /** Event class used to schedule a squash due to a trap (fault or + * interrupt) to happen on a specific cycle. + */ + class TrapEvent : public Event { + private: + DefaultCommit<Impl> *commit; + unsigned tid; + + public: + TrapEvent(DefaultCommit<Impl> *_commit, unsigned _tid); + + void process(); + const char *description(); + }; + + /** Overall commit status. Used to determine if the CPU can deschedule + * itself due to a lack of activity. + */ + enum CommitStatus{ + Active, + Inactive + }; + + /** Individual thread status. */ + enum ThreadStatus { + Running, + Idle, + ROBSquashing, + TrapPending, + FetchTrapPending + }; + + /** Commit policy for SMT mode. */ + enum CommitPolicy { + Aggressive, + RoundRobin, + OldestReady + }; + + private: + /** Overall commit status. */ + CommitStatus _status; + /** Next commit status, to be set at the end of the cycle. */ + CommitStatus _nextStatus; + /** Per-thread status. */ + ThreadStatus commitStatus[Impl::MaxThreads]; + /** Commit policy used in SMT mode. */ + CommitPolicy commitPolicy; + + public: + /** Construct a DefaultCommit with the given parameters. */ + DefaultCommit(Params *params); + + /** Returns the name of the DefaultCommit. */ + std::string name() const; + + /** Registers statistics. */ + void regStats(); + + /** Sets the CPU pointer. */ + void setCPU(O3CPU *cpu_ptr); + + /** Sets the list of threads. */ + void setThreads(std::vector<Thread *> &threads); + + /** Sets the main time buffer pointer, used for backwards communication. */ + void setTimeBuffer(TimeBuffer<TimeStruct> *tb_ptr); + + void setFetchQueue(TimeBuffer<FetchStruct> *fq_ptr); + + /** Sets the pointer to the queue coming from rename. */ + void setRenameQueue(TimeBuffer<RenameStruct> *rq_ptr); + + /** Sets the pointer to the queue coming from IEW. */ + void setIEWQueue(TimeBuffer<IEWStruct> *iq_ptr); + + /** Sets the pointer to the IEW stage. */ + void setIEWStage(IEW *iew_stage); + + /** Skid buffer between rename and commit. */ + std::queue<DynInstPtr> skidBuffer; + + /** The pointer to the IEW stage. Used solely to ensure that + * various events (traps, interrupts, syscalls) do not occur until + * all stores have written back. + */ + IEW *iewStage; + + /** Sets pointer to list of active threads. */ + void setActiveThreads(std::list<unsigned> *at_ptr); + + /** Sets pointer to the commited state rename map. */ + void setRenameMap(RenameMap rm_ptr[Impl::MaxThreads]); + + /** Sets pointer to the ROB. */ + void setROB(ROB *rob_ptr); + + /** Initializes stage by sending back the number of free entries. */ + void initStage(); + + /** Initializes the draining of commit. */ + bool drain(); + + /** Resumes execution after draining. */ + void resume(); + + /** Completes the switch out of commit. */ + void switchOut(); + + /** Takes over from another CPU's thread. */ + void takeOverFrom(); + + /** Ticks the commit stage, which tries to commit instructions. */ + void tick(); + + /** Handles any squashes that are sent from IEW, and adds instructions + * to the ROB and tries to commit instructions. + */ + void commit(); + + /** Returns the number of free ROB entries for a specific thread. */ + unsigned numROBFreeEntries(unsigned tid); + + /** Generates an event to schedule a squash due to a trap. */ + void generateTrapEvent(unsigned tid); + + /** Records that commit needs to initiate a squash due to an + * external state update through the TC. + */ + void generateTCEvent(unsigned tid); + + private: + /** Updates the overall status of commit with the nextStatus, and + * tell the CPU if commit is active/inactive. + */ + void updateStatus(); + + /** Sets the next status based on threads' statuses, which becomes the + * current status at the end of the cycle. + */ + void setNextStatus(); + + /** Checks if the ROB is completed with squashing. This is for the case + * where the ROB can take multiple cycles to complete squashing. + */ + bool robDoneSquashing(); + + /** Returns if any of the threads have the number of ROB entries changed + * on this cycle. Used to determine if the number of free ROB entries needs + * to be sent back to previous stages. + */ + bool changedROBEntries(); + + /** Squashes all in flight instructions. */ + void squashAll(unsigned tid); + + /** Handles squashing due to a trap. */ + void squashFromTrap(unsigned tid); + + /** Handles squashing due to an TC write. */ + void squashFromTC(unsigned tid); + + /** Commits as many instructions as possible. */ + void commitInsts(); + + /** Tries to commit the head ROB instruction passed in. + * @param head_inst The instruction to be committed. + */ + bool commitHead(DynInstPtr &head_inst, unsigned inst_num); + + /** Gets instructions from rename and inserts them into the ROB. */ + void getInsts(); + + /** Insert all instructions from rename into skidBuffer */ + void skidInsert(); + + /** Marks completed instructions using information sent from IEW. */ + void markCompletedInsts(); + + /** Gets the thread to commit, based on the SMT policy. */ + int getCommittingThread(); + + /** Returns the thread ID to use based on a round robin policy. */ + int roundRobin(); + + /** Returns the thread ID to use based on an oldest instruction policy. */ + int oldestReady(); + + public: + /** Returns the PC of the head instruction of the ROB. + * @todo: Probably remove this function as it returns only thread 0. + */ + uint64_t readPC() { return PC[0]; } + + /** Returns the PC of a specific thread. */ + uint64_t readPC(unsigned tid) { return PC[tid]; } + + /** Sets the PC of a specific thread. */ + void setPC(uint64_t val, unsigned tid) { PC[tid] = val; } + + /** Reads the next PC of a specific thread. */ + uint64_t readNextPC(unsigned tid) { return nextPC[tid]; } + + /** Sets the next PC of a specific thread. */ + void setNextPC(uint64_t val, unsigned tid) { nextPC[tid] = val; } + + /** Reads the next NPC of a specific thread. */ + uint64_t readNextNPC(unsigned tid) { return nextNPC[tid]; } + + /** Sets the next NPC of a specific thread. */ + void setNextNPC(uint64_t val, unsigned tid) { nextNPC[tid] = val; } + + private: + /** Time buffer interface. */ + TimeBuffer<TimeStruct> *timeBuffer; + + /** Wire to write information heading to previous stages. */ + typename TimeBuffer<TimeStruct>::wire toIEW; + + /** Wire to read information from IEW (for ROB). */ + typename TimeBuffer<TimeStruct>::wire robInfoFromIEW; + + TimeBuffer<FetchStruct> *fetchQueue; + + typename TimeBuffer<FetchStruct>::wire fromFetch; + + /** IEW instruction queue interface. */ + TimeBuffer<IEWStruct> *iewQueue; + + /** Wire to read information from IEW queue. */ + typename TimeBuffer<IEWStruct>::wire fromIEW; + + /** Rename instruction queue interface, for ROB. */ + TimeBuffer<RenameStruct> *renameQueue; + + /** Wire to read information from rename queue. */ + typename TimeBuffer<RenameStruct>::wire fromRename; + + public: + /** ROB interface. */ + ROB *rob; + + private: + /** Pointer to O3CPU. */ + O3CPU *cpu; + + /** Vector of all of the threads. */ + std::vector<Thread *> thread; + + /** Records that commit has written to the time buffer this cycle. Used for + * the CPU to determine if it can deschedule itself if there is no activity. + */ + bool wroteToTimeBuffer; + + /** Records if the number of ROB entries has changed this cycle. If it has, + * then the number of free entries must be re-broadcast. + */ + bool changedROBNumEntries[Impl::MaxThreads]; + + /** A counter of how many threads are currently squashing. */ + int squashCounter; + + /** Records if a thread has to squash this cycle due to a trap. */ + bool trapSquash[Impl::MaxThreads]; + + /** Records if a thread has to squash this cycle due to an XC write. */ + bool tcSquash[Impl::MaxThreads]; + + /** Priority List used for Commit Policy */ + std::list<unsigned> priority_list; + + /** IEW to Commit delay, in ticks. */ + unsigned iewToCommitDelay; + + /** Commit to IEW delay, in ticks. */ + unsigned commitToIEWDelay; + + /** Rename to ROB delay, in ticks. */ + unsigned renameToROBDelay; + + unsigned fetchToCommitDelay; + + /** Rename width, in instructions. Used so ROB knows how many + * instructions to get from the rename instruction queue. + */ + unsigned renameWidth; + + /** Commit width, in instructions. */ + unsigned commitWidth; + + /** Number of Reorder Buffers */ + unsigned numRobs; + + /** Number of Active Threads */ + unsigned numThreads; + + /** Is a drain pending. */ + bool drainPending; + + /** Is commit switched out. */ + bool switchedOut; + + /** The latency to handle a trap. Used when scheduling trap + * squash event. + */ + Tick trapLatency; + + /** The commit PC of each thread. Refers to the instruction that + * is currently being processed/committed. + */ + Addr PC[Impl::MaxThreads]; + + /** The next PC of each thread. */ + Addr nextPC[Impl::MaxThreads]; + + /** The next NPC of each thread. */ + Addr nextNPC[Impl::MaxThreads]; + + /** The sequence number of the youngest valid instruction in the ROB. */ + InstSeqNum youngestSeqNum[Impl::MaxThreads]; + + /** Pointer to the list of active threads. */ + std::list<unsigned> *activeThreads; + + /** Rename map interface. */ + RenameMap *renameMap[Impl::MaxThreads]; + + /** Updates commit stats based on this instruction. */ + void updateComInstStats(DynInstPtr &inst); + + /** Stat for the total number of committed instructions. */ + Stats::Scalar<> commitCommittedInsts; + /** Stat for the total number of squashed instructions discarded by commit. + */ + Stats::Scalar<> commitSquashedInsts; + /** Stat for the total number of times commit is told to squash. + * @todo: Actually increment this stat. + */ + Stats::Scalar<> commitSquashEvents; + /** Stat for the total number of times commit has had to stall due to a non- + * speculative instruction reaching the head of the ROB. + */ + Stats::Scalar<> commitNonSpecStalls; + /** Stat for the total number of branch mispredicts that caused a squash. */ + Stats::Scalar<> branchMispredicts; + /** Distribution of the number of committed instructions each cycle. */ + Stats::Distribution<> numCommittedDist; + + /** Total number of instructions committed. */ + Stats::Vector<> statComInst; + /** Total number of software prefetches committed. */ + Stats::Vector<> statComSwp; + /** Stat for the total number of committed memory references. */ + Stats::Vector<> statComRefs; + /** Stat for the total number of committed loads. */ + Stats::Vector<> statComLoads; + /** Total number of committed memory barriers. */ + Stats::Vector<> statComMembars; + /** Total number of committed branches. */ + Stats::Vector<> statComBranches; + + /** Number of cycles where the commit bandwidth limit is reached. */ + Stats::Scalar<> commitEligibleSamples; + /** Number of instructions not committed due to bandwidth limits. */ + Stats::Vector<> commitEligible; +}; + +#endif // __CPU_O3_COMMIT_HH__ diff --git a/src/cpu/o3/commit_impl.hh b/src/cpu/o3/commit_impl.hh new file mode 100644 index 000000000..6ae01ae67 --- /dev/null +++ b/src/cpu/o3/commit_impl.hh @@ -0,0 +1,1419 @@ +/* + * Copyright (c) 2004-2006 The Regents of The University of Michigan + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are + * met: redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer; + * redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution; + * neither the name of the copyright holders nor the names of its + * contributors may be used to endorse or promote products derived from + * this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + * Authors: Kevin Lim + * Korey Sewell + */ + +#include "config/full_system.hh" +#include "config/use_checker.hh" + +#include <algorithm> +#include <string> + +#include "base/loader/symtab.hh" +#include "base/timebuf.hh" +#include "cpu/exetrace.hh" +#include "cpu/o3/commit.hh" +#include "cpu/o3/thread_state.hh" + +#if USE_CHECKER +#include "cpu/checker/cpu.hh" +#endif + +template <class Impl> +DefaultCommit<Impl>::TrapEvent::TrapEvent(DefaultCommit<Impl> *_commit, + unsigned _tid) + : Event(&mainEventQueue, CPU_Tick_Pri), commit(_commit), tid(_tid) +{ + this->setFlags(Event::AutoDelete); +} + +template <class Impl> +void +DefaultCommit<Impl>::TrapEvent::process() +{ + // This will get reset by commit if it was switched out at the + // time of this event processing. + commit->trapSquash[tid] = true; +} + +template <class Impl> +const char * +DefaultCommit<Impl>::TrapEvent::description() +{ + return "Trap event"; +} + +template <class Impl> +DefaultCommit<Impl>::DefaultCommit(Params *params) + : squashCounter(0), + iewToCommitDelay(params->iewToCommitDelay), + commitToIEWDelay(params->commitToIEWDelay), + renameToROBDelay(params->renameToROBDelay), + fetchToCommitDelay(params->commitToFetchDelay), + renameWidth(params->renameWidth), + commitWidth(params->commitWidth), + numThreads(params->numberOfThreads), + drainPending(false), + switchedOut(false), + trapLatency(params->trapLatency) +{ + _status = Active; + _nextStatus = Inactive; + std::string policy = params->smtCommitPolicy; + + //Convert string to lowercase + std::transform(policy.begin(), policy.end(), policy.begin(), + (int(*)(int)) tolower); + + //Assign commit policy + if (policy == "aggressive"){ + commitPolicy = Aggressive; + + DPRINTF(Commit,"Commit Policy set to Aggressive."); + } else if (policy == "roundrobin"){ + commitPolicy = RoundRobin; + + //Set-Up Priority List + for (int tid=0; tid < numThreads; tid++) { + priority_list.push_back(tid); + } + + DPRINTF(Commit,"Commit Policy set to Round Robin."); + } else if (policy == "oldestready"){ + commitPolicy = OldestReady; + + DPRINTF(Commit,"Commit Policy set to Oldest Ready."); + } else { + assert(0 && "Invalid SMT Commit Policy. Options Are: {Aggressive," + "RoundRobin,OldestReady}"); + } + + for (int i=0; i < numThreads; i++) { + commitStatus[i] = Idle; + changedROBNumEntries[i] = false; + trapSquash[i] = false; + tcSquash[i] = false; + PC[i] = nextPC[i] = nextNPC[i] = 0; + } +} + +template <class Impl> +std::string +DefaultCommit<Impl>::name() const +{ + return cpu->name() + ".commit"; +} + +template <class Impl> +void +DefaultCommit<Impl>::regStats() +{ + using namespace Stats; + commitCommittedInsts + .name(name() + ".commitCommittedInsts") + .desc("The number of committed instructions") + .prereq(commitCommittedInsts); + commitSquashedInsts + .name(name() + ".commitSquashedInsts") + .desc("The number of squashed insts skipped by commit") + .prereq(commitSquashedInsts); + commitSquashEvents + .name(name() + ".commitSquashEvents") + .desc("The number of times commit is told to squash") + .prereq(commitSquashEvents); + commitNonSpecStalls + .name(name() + ".commitNonSpecStalls") + .desc("The number of times commit has been forced to stall to " + "communicate backwards") + .prereq(commitNonSpecStalls); + branchMispredicts + .name(name() + ".branchMispredicts") + .desc("The number of times a branch was mispredicted") + .prereq(branchMispredicts); + numCommittedDist + .init(0,commitWidth,1) + .name(name() + ".COM:committed_per_cycle") + .desc("Number of insts commited each cycle") + .flags(Stats::pdf) + ; + + statComInst + .init(cpu->number_of_threads) + .name(name() + ".COM:count") + .desc("Number of instructions committed") + .flags(total) + ; + + statComSwp + .init(cpu->number_of_threads) + .name(name() + ".COM:swp_count") + .desc("Number of s/w prefetches committed") + .flags(total) + ; + + statComRefs + .init(cpu->number_of_threads) + .name(name() + ".COM:refs") + .desc("Number of memory references committed") + .flags(total) + ; + + statComLoads + .init(cpu->number_of_threads) + .name(name() + ".COM:loads") + .desc("Number of loads committed") + .flags(total) + ; + + statComMembars + .init(cpu->number_of_threads) + .name(name() + ".COM:membars") + .desc("Number of memory barriers committed") + .flags(total) + ; + + statComBranches + .init(cpu->number_of_threads) + .name(name() + ".COM:branches") + .desc("Number of branches committed") + .flags(total) + ; + + commitEligible + .init(cpu->number_of_threads) + .name(name() + ".COM:bw_limited") + .desc("number of insts not committed due to BW limits") + .flags(total) + ; + + commitEligibleSamples + .name(name() + ".COM:bw_lim_events") + .desc("number cycles where commit BW limit reached") + ; +} + +template <class Impl> +void +DefaultCommit<Impl>::setCPU(O3CPU *cpu_ptr) +{ + DPRINTF(Commit, "Commit: Setting CPU pointer.\n"); + cpu = cpu_ptr; + + // Commit must broadcast the number of free entries it has at the start of + // the simulation, so it starts as active. + cpu->activateStage(O3CPU::CommitIdx); + + trapLatency = cpu->cycles(trapLatency); +} + +template <class Impl> +void +DefaultCommit<Impl>::setThreads(std::vector<Thread *> &threads) +{ + thread = threads; +} + +template <class Impl> +void +DefaultCommit<Impl>::setTimeBuffer(TimeBuffer<TimeStruct> *tb_ptr) +{ + DPRINTF(Commit, "Commit: Setting time buffer pointer.\n"); + timeBuffer = tb_ptr; + + // Setup wire to send information back to IEW. + toIEW = timeBuffer->getWire(0); + + // Setup wire to read data from IEW (for the ROB). + robInfoFromIEW = timeBuffer->getWire(-iewToCommitDelay); +} + +template <class Impl> +void +DefaultCommit<Impl>::setFetchQueue(TimeBuffer<FetchStruct> *fq_ptr) +{ + DPRINTF(Commit, "Commit: Setting fetch queue pointer.\n"); + fetchQueue = fq_ptr; + + // Setup wire to get instructions from rename (for the ROB). + fromFetch = fetchQueue->getWire(-fetchToCommitDelay); +} + +template <class Impl> +void +DefaultCommit<Impl>::setRenameQueue(TimeBuffer<RenameStruct> *rq_ptr) +{ + DPRINTF(Commit, "Commit: Setting rename queue pointer.\n"); + renameQueue = rq_ptr; + + // Setup wire to get instructions from rename (for the ROB). + fromRename = renameQueue->getWire(-renameToROBDelay); +} + +template <class Impl> +void +DefaultCommit<Impl>::setIEWQueue(TimeBuffer<IEWStruct> *iq_ptr) +{ + DPRINTF(Commit, "Commit: Setting IEW queue pointer.\n"); + iewQueue = iq_ptr; + + // Setup wire to get instructions from IEW. + fromIEW = iewQueue->getWire(-iewToCommitDelay); +} + +template <class Impl> +void +DefaultCommit<Impl>::setIEWStage(IEW *iew_stage) +{ + iewStage = iew_stage; +} + +template<class Impl> +void +DefaultCommit<Impl>::setActiveThreads(std::list<unsigned> *at_ptr) +{ + DPRINTF(Commit, "Commit: Setting active threads list pointer.\n"); + activeThreads = at_ptr; +} + +template <class Impl> +void +DefaultCommit<Impl>::setRenameMap(RenameMap rm_ptr[]) +{ + DPRINTF(Commit, "Setting rename map pointers.\n"); + + for (int i=0; i < numThreads; i++) { + renameMap[i] = &rm_ptr[i]; + } +} + +template <class Impl> +void +DefaultCommit<Impl>::setROB(ROB *rob_ptr) +{ + DPRINTF(Commit, "Commit: Setting ROB pointer.\n"); + rob = rob_ptr; +} + +template <class Impl> +void +DefaultCommit<Impl>::initStage() +{ + rob->setActiveThreads(activeThreads); + rob->resetEntries(); + + // Broadcast the number of free entries. + for (int i=0; i < numThreads; i++) { + toIEW->commitInfo[i].usedROB = true; + toIEW->commitInfo[i].freeROBEntries = rob->numFreeEntries(i); + } + + cpu->activityThisCycle(); +} + +template <class Impl> +bool +DefaultCommit<Impl>::drain() +{ + drainPending = true; + + // If it's already drained, return true. + if (rob->isEmpty() && !iewStage->hasStoresToWB()) { + cpu->signalDrained(); + return true; + } + + return false; +} + +template <class Impl> +void +DefaultCommit<Impl>::switchOut() +{ + switchedOut = true; + drainPending = false; + rob->switchOut(); +} + +template <class Impl> +void +DefaultCommit<Impl>::resume() +{ + drainPending = false; +} + +template <class Impl> +void +DefaultCommit<Impl>::takeOverFrom() +{ + switchedOut = false; + _status = Active; + _nextStatus = Inactive; + for (int i=0; i < numThreads; i++) { + commitStatus[i] = Idle; + changedROBNumEntries[i] = false; + trapSquash[i] = false; + tcSquash[i] = false; + } + squashCounter = 0; + rob->takeOverFrom(); +} + +template <class Impl> +void +DefaultCommit<Impl>::updateStatus() +{ + // reset ROB changed variable + std::list<unsigned>::iterator threads = (*activeThreads).begin(); + while (threads != (*activeThreads).end()) { + unsigned tid = *threads++; + changedROBNumEntries[tid] = false; + + // Also check if any of the threads has a trap pending + if (commitStatus[tid] == TrapPending || + commitStatus[tid] == FetchTrapPending) { + _nextStatus = Active; + } + } + + if (_nextStatus == Inactive && _status == Active) { + DPRINTF(Activity, "Deactivating stage.\n"); + cpu->deactivateStage(O3CPU::CommitIdx); + } else if (_nextStatus == Active && _status == Inactive) { + DPRINTF(Activity, "Activating stage.\n"); + cpu->activateStage(O3CPU::CommitIdx); + } + + _status = _nextStatus; +} + +template <class Impl> +void +DefaultCommit<Impl>::setNextStatus() +{ + int squashes = 0; + + std::list<unsigned>::iterator threads = (*activeThreads).begin(); + + while (threads != (*activeThreads).end()) { + unsigned tid = *threads++; + + if (commitStatus[tid] == ROBSquashing) { + squashes++; + } + } + + squashCounter = squashes; + + // If commit is currently squashing, then it will have activity for the + // next cycle. Set its next status as active. + if (squashCounter) { + _nextStatus = Active; + } +} + +template <class Impl> +bool +DefaultCommit<Impl>::changedROBEntries() +{ + std::list<unsigned>::iterator threads = (*activeThreads).begin(); + + while (threads != (*activeThreads).end()) { + unsigned tid = *threads++; + + if (changedROBNumEntries[tid]) { + return true; + } + } + + return false; +} + +template <class Impl> +unsigned +DefaultCommit<Impl>::numROBFreeEntries(unsigned tid) +{ + return rob->numFreeEntries(tid); +} + +template <class Impl> +void +DefaultCommit<Impl>::generateTrapEvent(unsigned tid) +{ + DPRINTF(Commit, "Generating trap event for [tid:%i]\n", tid); + + TrapEvent *trap = new TrapEvent(this, tid); + + trap->schedule(curTick + trapLatency); + + thread[tid]->trapPending = true; +} + +template <class Impl> +void +DefaultCommit<Impl>::generateTCEvent(unsigned tid) +{ + DPRINTF(Commit, "Generating TC squash event for [tid:%i]\n", tid); + + tcSquash[tid] = true; +} + +template <class Impl> +void +DefaultCommit<Impl>::squashAll(unsigned tid) +{ + // If we want to include the squashing instruction in the squash, + // then use one older sequence number. + // Hopefully this doesn't mess things up. Basically I want to squash + // all instructions of this thread. + InstSeqNum squashed_inst = rob->isEmpty() ? + 0 : rob->readHeadInst(tid)->seqNum - 1;; + + // All younger instructions will be squashed. Set the sequence + // number as the youngest instruction in the ROB (0 in this case. + // Hopefully nothing breaks.) + youngestSeqNum[tid] = 0; + + rob->squash(squashed_inst, tid); + changedROBNumEntries[tid] = true; + + // Send back the sequence number of the squashed instruction. + toIEW->commitInfo[tid].doneSeqNum = squashed_inst; + + // Send back the squash signal to tell stages that they should + // squash. + toIEW->commitInfo[tid].squash = true; + + // Send back the rob squashing signal so other stages know that + // the ROB is in the process of squashing. + toIEW->commitInfo[tid].robSquashing = true; + + toIEW->commitInfo[tid].branchMispredict = false; + + toIEW->commitInfo[tid].nextPC = PC[tid]; +} + +template <class Impl> +void +DefaultCommit<Impl>::squashFromTrap(unsigned tid) +{ + squashAll(tid); + + DPRINTF(Commit, "Squashing from trap, restarting at PC %#x\n", PC[tid]); + + thread[tid]->trapPending = false; + thread[tid]->inSyscall = false; + + trapSquash[tid] = false; + + commitStatus[tid] = ROBSquashing; + cpu->activityThisCycle(); +} + +template <class Impl> +void +DefaultCommit<Impl>::squashFromTC(unsigned tid) +{ + squashAll(tid); + + DPRINTF(Commit, "Squashing from TC, restarting at PC %#x\n", PC[tid]); + + thread[tid]->inSyscall = false; + assert(!thread[tid]->trapPending); + + commitStatus[tid] = ROBSquashing; + cpu->activityThisCycle(); + + tcSquash[tid] = false; +} + +template <class Impl> +void +DefaultCommit<Impl>::tick() +{ + wroteToTimeBuffer = false; + _nextStatus = Inactive; + + if (drainPending && rob->isEmpty() && !iewStage->hasStoresToWB()) { + cpu->signalDrained(); + drainPending = false; + return; + } + + if ((*activeThreads).size() <= 0) + return; + + std::list<unsigned>::iterator threads = (*activeThreads).begin(); + + // Check if any of the threads are done squashing. Change the + // status if they are done. + while (threads != (*activeThreads).end()) { + unsigned tid = *threads++; + + if (commitStatus[tid] == ROBSquashing) { + + if (rob->isDoneSquashing(tid)) { + commitStatus[tid] = Running; + } else { + DPRINTF(Commit,"[tid:%u]: Still Squashing, cannot commit any" + " insts this cycle.\n", tid); + rob->doSquash(tid); + toIEW->commitInfo[tid].robSquashing = true; + wroteToTimeBuffer = true; + } + } + } + + commit(); + + markCompletedInsts(); + + threads = (*activeThreads).begin(); + + while (threads != (*activeThreads).end()) { + unsigned tid = *threads++; + + if (!rob->isEmpty(tid) && rob->readHeadInst(tid)->readyToCommit()) { + // The ROB has more instructions it can commit. Its next status + // will be active. + _nextStatus = Active; + + DynInstPtr inst = rob->readHeadInst(tid); + + DPRINTF(Commit,"[tid:%i]: Instruction [sn:%lli] PC %#x is head of" + " ROB and ready to commit\n", + tid, inst->seqNum, inst->readPC()); + + } else if (!rob->isEmpty(tid)) { + DynInstPtr inst = rob->readHeadInst(tid); + + DPRINTF(Commit,"[tid:%i]: Can't commit, Instruction [sn:%lli] PC " + "%#x is head of ROB and not ready\n", + tid, inst->seqNum, inst->readPC()); + } + + DPRINTF(Commit, "[tid:%i]: ROB has %d insts & %d free entries.\n", + tid, rob->countInsts(tid), rob->numFreeEntries(tid)); + } + + + if (wroteToTimeBuffer) { + DPRINTF(Activity, "Activity This Cycle.\n"); + cpu->activityThisCycle(); + } + + updateStatus(); +} + +template <class Impl> +void +DefaultCommit<Impl>::commit() +{ + + ////////////////////////////////////// + // Check for interrupts + ////////////////////////////////////// + +#if FULL_SYSTEM + // Process interrupts if interrupts are enabled, not in PAL mode, + // and no other traps or external squashes are currently pending. + // @todo: Allow other threads to handle interrupts. + if (cpu->checkInterrupts && + cpu->check_interrupts() && + !cpu->inPalMode(readPC()) && + !trapSquash[0] && + !tcSquash[0]) { + // Tell fetch that there is an interrupt pending. This will + // make fetch wait until it sees a non PAL-mode PC, at which + // point it stops fetching instructions. + toIEW->commitInfo[0].interruptPending = true; + + // Wait until the ROB is empty and all stores have drained in + // order to enter the interrupt. + if (rob->isEmpty() && !iewStage->hasStoresToWB()) { + // Not sure which thread should be the one to interrupt. For now + // always do thread 0. + assert(!thread[0]->inSyscall); + thread[0]->inSyscall = true; + + // CPU will handle implementation of the interrupt. + cpu->processInterrupts(); + + // Now squash or record that I need to squash this cycle. + commitStatus[0] = TrapPending; + + // Exit state update mode to avoid accidental updating. + thread[0]->inSyscall = false; + + // Generate trap squash event. + generateTrapEvent(0); + + toIEW->commitInfo[0].clearInterrupt = true; + + DPRINTF(Commit, "Interrupt detected.\n"); + } else { + DPRINTF(Commit, "Interrupt pending, waiting for ROB to empty.\n"); + } + } +#endif // FULL_SYSTEM + + //////////////////////////////////// + // Check for any possible squashes, handle them first + //////////////////////////////////// + + std::list<unsigned>::iterator threads = (*activeThreads).begin(); + + while (threads != (*activeThreads).end()) { + unsigned tid = *threads++; + + // Not sure which one takes priority. I think if we have + // both, that's a bad sign. + if (trapSquash[tid] == true) { + assert(!tcSquash[tid]); + squashFromTrap(tid); + } else if (tcSquash[tid] == true) { + squashFromTC(tid); + } + + // Squashed sequence number must be older than youngest valid + // instruction in the ROB. This prevents squashes from younger + // instructions overriding squashes from older instructions. + if (fromIEW->squash[tid] && + commitStatus[tid] != TrapPending && + fromIEW->squashedSeqNum[tid] <= youngestSeqNum[tid]) { + + DPRINTF(Commit, "[tid:%i]: Squashing due to PC %#x [sn:%i]\n", + tid, + fromIEW->mispredPC[tid], + fromIEW->squashedSeqNum[tid]); + + DPRINTF(Commit, "[tid:%i]: Redirecting to PC %#x\n", + tid, + fromIEW->nextPC[tid]); + + commitStatus[tid] = ROBSquashing; + + // If we want to include the squashing instruction in the squash, + // then use one older sequence number. + InstSeqNum squashed_inst = fromIEW->squashedSeqNum[tid]; + +#if ISA_HAS_DELAY_SLOT + InstSeqNum bdelay_done_seq_num; + bool squash_bdelay_slot; + + if (fromIEW->branchMispredict[tid]) { + if (fromIEW->branchTaken[tid] && + fromIEW->condDelaySlotBranch[tid]) { + DPRINTF(Commit, "[tid:%i]: Cond. delay slot branch" + "mispredicted as taken. Squashing after previous " + "inst, [sn:%i]\n", + tid, squashed_inst); + bdelay_done_seq_num = squashed_inst; + squash_bdelay_slot = true; + } else { + DPRINTF(Commit, "[tid:%i]: Branch Mispredict. Squashing " + "after delay slot [sn:%i]\n", tid, squashed_inst+1); + bdelay_done_seq_num = squashed_inst + 1; + squash_bdelay_slot = false; + } + } else { + bdelay_done_seq_num = squashed_inst; + } +#endif + + if (fromIEW->includeSquashInst[tid] == true) { + squashed_inst--; +#if ISA_HAS_DELAY_SLOT + bdelay_done_seq_num--; +#endif + } + // All younger instructions will be squashed. Set the sequence + // number as the youngest instruction in the ROB. + youngestSeqNum[tid] = squashed_inst; + +#if ISA_HAS_DELAY_SLOT + rob->squash(bdelay_done_seq_num, tid); + toIEW->commitInfo[tid].squashDelaySlot = squash_bdelay_slot; + toIEW->commitInfo[tid].bdelayDoneSeqNum = bdelay_done_seq_num; +#else + rob->squash(squashed_inst, tid); + toIEW->commitInfo[tid].squashDelaySlot = true; +#endif + changedROBNumEntries[tid] = true; + + toIEW->commitInfo[tid].doneSeqNum = squashed_inst; + + toIEW->commitInfo[tid].squash = true; + + // Send back the rob squashing signal so other stages know that + // the ROB is in the process of squashing. + toIEW->commitInfo[tid].robSquashing = true; + + toIEW->commitInfo[tid].branchMispredict = + fromIEW->branchMispredict[tid]; + + toIEW->commitInfo[tid].branchTaken = + fromIEW->branchTaken[tid]; + + toIEW->commitInfo[tid].nextPC = fromIEW->nextPC[tid]; + + toIEW->commitInfo[tid].mispredPC = fromIEW->mispredPC[tid]; + + if (toIEW->commitInfo[tid].branchMispredict) { + ++branchMispredicts; + } + } + + } + + setNextStatus(); + + if (squashCounter != numThreads) { + // If we're not currently squashing, then get instructions. + getInsts(); + + // Try to commit any instructions. + commitInsts(); + } else { +#if ISA_HAS_DELAY_SLOT + skidInsert(); +#endif + } + + //Check for any activity + threads = (*activeThreads).begin(); + + while (threads != (*activeThreads).end()) { + unsigned tid = *threads++; + + if (changedROBNumEntries[tid]) { + toIEW->commitInfo[tid].usedROB = true; + toIEW->commitInfo[tid].freeROBEntries = rob->numFreeEntries(tid); + + if (rob->isEmpty(tid)) { + toIEW->commitInfo[tid].emptyROB = true; + } + + wroteToTimeBuffer = true; + changedROBNumEntries[tid] = false; + } + } +} + +template <class Impl> +void +DefaultCommit<Impl>::commitInsts() +{ + //////////////////////////////////// + // Handle commit + // Note that commit will be handled prior to putting new + // instructions in the ROB so that the ROB only tries to commit + // instructions it has in this current cycle, and not instructions + // it is writing in during this cycle. Can't commit and squash + // things at the same time... + //////////////////////////////////// + + DPRINTF(Commit, "Trying to commit instructions in the ROB.\n"); + + unsigned num_committed = 0; + + DynInstPtr head_inst; + + // Commit as many instructions as possible until the commit bandwidth + // limit is reached, or it becomes impossible to commit any more. + while (num_committed < commitWidth) { + int commit_thread = getCommittingThread(); + + if (commit_thread == -1 || !rob->isHeadReady(commit_thread)) + break; + + head_inst = rob->readHeadInst(commit_thread); + + int tid = head_inst->threadNumber; + + assert(tid == commit_thread); + + DPRINTF(Commit, "Trying to commit head instruction, [sn:%i] [tid:%i]\n", + head_inst->seqNum, tid); + + // If the head instruction is squashed, it is ready to retire + // (be removed from the ROB) at any time. + if (head_inst->isSquashed()) { + + DPRINTF(Commit, "Retiring squashed instruction from " + "ROB.\n"); + + rob->retireHead(commit_thread); + + ++commitSquashedInsts; + + // Record that the number of ROB entries has changed. + changedROBNumEntries[tid] = true; + } else { + PC[tid] = head_inst->readPC(); + nextPC[tid] = head_inst->readNextPC(); + nextNPC[tid] = head_inst->readNextNPC(); + + // Increment the total number of non-speculative instructions + // executed. + // Hack for now: it really shouldn't happen until after the + // commit is deemed to be successful, but this count is needed + // for syscalls. + thread[tid]->funcExeInst++; + + // Try to commit the head instruction. + bool commit_success = commitHead(head_inst, num_committed); + + if (commit_success) { + ++num_committed; + + changedROBNumEntries[tid] = true; + + // Set the doneSeqNum to the youngest committed instruction. + toIEW->commitInfo[tid].doneSeqNum = head_inst->seqNum; + + ++commitCommittedInsts; + + // To match the old model, don't count nops and instruction + // prefetches towards the total commit count. + if (!head_inst->isNop() && !head_inst->isInstPrefetch()) { + cpu->instDone(tid); + } + + PC[tid] = nextPC[tid]; +#if ISA_HAS_DELAY_SLOT + nextPC[tid] = nextNPC[tid]; + nextNPC[tid] = nextNPC[tid] + sizeof(TheISA::MachInst); +#else + nextPC[tid] = nextPC[tid] + sizeof(TheISA::MachInst); +#endif + +#if FULL_SYSTEM + int count = 0; + Addr oldpc; + do { + // Debug statement. Checks to make sure we're not + // currently updating state while handling PC events. + if (count == 0) + assert(!thread[tid]->inSyscall && + !thread[tid]->trapPending); + oldpc = PC[tid]; + cpu->system->pcEventQueue.service( + thread[tid]->getTC()); + count++; + } while (oldpc != PC[tid]); + if (count > 1) { + DPRINTF(Commit, "PC skip function event, stopping commit\n"); + break; + } +#endif + } else { + DPRINTF(Commit, "Unable to commit head instruction PC:%#x " + "[tid:%i] [sn:%i].\n", + head_inst->readPC(), tid ,head_inst->seqNum); + break; + } + } + } + + DPRINTF(CommitRate, "%i\n", num_committed); + numCommittedDist.sample(num_committed); + + if (num_committed == commitWidth) { + commitEligibleSamples++; + } +} + +template <class Impl> +bool +DefaultCommit<Impl>::commitHead(DynInstPtr &head_inst, unsigned inst_num) +{ + assert(head_inst); + + int tid = head_inst->threadNumber; + + // If the instruction is not executed yet, then it will need extra + // handling. Signal backwards that it should be executed. + if (!head_inst->isExecuted()) { + // Keep this number correct. We have not yet actually executed + // and committed this instruction. + thread[tid]->funcExeInst--; + + head_inst->setAtCommit(); + + if (head_inst->isNonSpeculative() || + head_inst->isStoreConditional() || + head_inst->isMemBarrier() || + head_inst->isWriteBarrier()) { + + DPRINTF(Commit, "Encountered a barrier or non-speculative " + "instruction [sn:%lli] at the head of the ROB, PC %#x.\n", + head_inst->seqNum, head_inst->readPC()); + +#if !FULL_SYSTEM + // Hack to make sure syscalls/memory barriers/quiesces + // aren't executed until all stores write back their data. + // This direct communication shouldn't be used for + // anything other than this. + if (inst_num > 0 || iewStage->hasStoresToWB()) +#else + if ((head_inst->isMemBarrier() || head_inst->isWriteBarrier() || + head_inst->isQuiesce()) && + iewStage->hasStoresToWB()) +#endif + { + DPRINTF(Commit, "Waiting for all stores to writeback.\n"); + return false; + } + + toIEW->commitInfo[tid].nonSpecSeqNum = head_inst->seqNum; + + // Change the instruction so it won't try to commit again until + // it is executed. + head_inst->clearCanCommit(); + + ++commitNonSpecStalls; + + return false; + } else if (head_inst->isLoad()) { + DPRINTF(Commit, "[sn:%lli]: Uncached load, PC %#x.\n", + head_inst->seqNum, head_inst->readPC()); + + // Send back the non-speculative instruction's sequence + // number. Tell the lsq to re-execute the load. + toIEW->commitInfo[tid].nonSpecSeqNum = head_inst->seqNum; + toIEW->commitInfo[tid].uncached = true; + toIEW->commitInfo[tid].uncachedLoad = head_inst; + + head_inst->clearCanCommit(); + + return false; + } else { + panic("Trying to commit un-executed instruction " + "of unknown type!\n"); + } + } + + if (head_inst->isThreadSync()) { + // Not handled for now. + panic("Thread sync instructions are not handled yet.\n"); + } + + // Stores mark themselves as completed. + if (!head_inst->isStore()) { + head_inst->setCompleted(); + } + +#if USE_CHECKER + // Use checker prior to updating anything due to traps or PC + // based events. + if (cpu->checker) { + cpu->checker->verify(head_inst); + } +#endif + + // Check if the instruction caused a fault. If so, trap. + Fault inst_fault = head_inst->getFault(); + + // DTB will sometimes need the machine instruction for when + // faults happen. So we will set it here, prior to the DTB + // possibly needing it for its fault. + thread[tid]->setInst( + static_cast<TheISA::MachInst>(head_inst->staticInst->machInst)); + + if (inst_fault != NoFault) { + head_inst->setCompleted(); + DPRINTF(Commit, "Inst [sn:%lli] PC %#x has a fault\n", + head_inst->seqNum, head_inst->readPC()); + + if (iewStage->hasStoresToWB() || inst_num > 0) { + DPRINTF(Commit, "Stores outstanding, fault must wait.\n"); + return false; + } + +#if USE_CHECKER + if (cpu->checker && head_inst->isStore()) { + cpu->checker->verify(head_inst); + } +#endif + + assert(!thread[tid]->inSyscall); + + // Mark that we're in state update mode so that the trap's + // execution doesn't generate extra squashes. + thread[tid]->inSyscall = true; + + // Execute the trap. Although it's slightly unrealistic in + // terms of timing (as it doesn't wait for the full timing of + // the trap event to complete before updating state), it's + // needed to update the state as soon as possible. This + // prevents external agents from changing any specific state + // that the trap need. + cpu->trap(inst_fault, tid); + + // Exit state update mode to avoid accidental updating. + thread[tid]->inSyscall = false; + + commitStatus[tid] = TrapPending; + + // Generate trap squash event. + generateTrapEvent(tid); +// warn("%lli fault (%d) handled @ PC %08p", curTick, inst_fault->name(), head_inst->readPC()); + return false; + } + + updateComInstStats(head_inst); + +#if FULL_SYSTEM + if (thread[tid]->profile) { +// bool usermode = +// (cpu->readMiscReg(AlphaISA::IPR_DTB_CM, tid) & 0x18) != 0; +// thread[tid]->profilePC = usermode ? 1 : head_inst->readPC(); + thread[tid]->profilePC = head_inst->readPC(); + ProfileNode *node = thread[tid]->profile->consume(thread[tid]->getXCProxy(), + head_inst->staticInst); + + if (node) + thread[tid]->profileNode = node; + } +#endif + + if (head_inst->traceData) { + head_inst->traceData->setFetchSeq(head_inst->seqNum); + head_inst->traceData->setCPSeq(thread[tid]->numInst); + head_inst->traceData->finalize(); + head_inst->traceData = NULL; + } + + // Update the commit rename map + for (int i = 0; i < head_inst->numDestRegs(); i++) { + renameMap[tid]->setEntry(head_inst->destRegIdx(i), + head_inst->renamedDestRegIdx(i)); + } + + if (head_inst->isCopy()) + panic("Should not commit any copy instructions!"); + + // Finally clear the head ROB entry. + rob->retireHead(tid); + + // Return true to indicate that we have committed an instruction. + return true; +} + +template <class Impl> +void +DefaultCommit<Impl>::getInsts() +{ + DPRINTF(Commit, "Getting instructions from Rename stage.\n"); + +#if ISA_HAS_DELAY_SLOT + // Read any renamed instructions and place them into the ROB. + int insts_to_process = std::min((int)renameWidth, + (int)(fromRename->size + skidBuffer.size())); + int rename_idx = 0; + + DPRINTF(Commit, "%i insts available to process. Rename Insts:%i " + "SkidBuffer Insts:%i\n", insts_to_process, fromRename->size, + skidBuffer.size()); +#else + // Read any renamed instructions and place them into the ROB. + int insts_to_process = std::min((int)renameWidth, fromRename->size); +#endif + + + for (int inst_num = 0; inst_num < insts_to_process; ++inst_num) { + DynInstPtr inst; + +#if ISA_HAS_DELAY_SLOT + // Get insts from skidBuffer or from Rename + if (skidBuffer.size() > 0) { + DPRINTF(Commit, "Grabbing skidbuffer inst.\n"); + inst = skidBuffer.front(); + skidBuffer.pop(); + } else { + DPRINTF(Commit, "Grabbing rename inst.\n"); + inst = fromRename->insts[rename_idx++]; + } +#else + inst = fromRename->insts[inst_num]; +#endif + int tid = inst->threadNumber; + + if (!inst->isSquashed() && + commitStatus[tid] != ROBSquashing) { + changedROBNumEntries[tid] = true; + + DPRINTF(Commit, "Inserting PC %#x [sn:%i] [tid:%i] into ROB.\n", + inst->readPC(), inst->seqNum, tid); + + rob->insertInst(inst); + + assert(rob->getThreadEntries(tid) <= rob->getMaxEntries(tid)); + + youngestSeqNum[tid] = inst->seqNum; + } else { + DPRINTF(Commit, "Instruction PC %#x [sn:%i] [tid:%i] was " + "squashed, skipping.\n", + inst->readPC(), inst->seqNum, tid); + } + } + +#if ISA_HAS_DELAY_SLOT + if (rename_idx < fromRename->size) { + DPRINTF(Commit,"Placing Rename Insts into skidBuffer.\n"); + + for (; + rename_idx < fromRename->size; + rename_idx++) { + DynInstPtr inst = fromRename->insts[rename_idx]; + int tid = inst->threadNumber; + + if (!inst->isSquashed()) { + DPRINTF(Commit, "Inserting PC %#x [sn:%i] [tid:%i] into ", + "skidBuffer.\n", inst->readPC(), inst->seqNum, tid); + skidBuffer.push(inst); + } else { + DPRINTF(Commit, "Instruction PC %#x [sn:%i] [tid:%i] was " + "squashed, skipping.\n", + inst->readPC(), inst->seqNum, tid); + } + } + } +#endif + +} + +template <class Impl> +void +DefaultCommit<Impl>::skidInsert() +{ + DPRINTF(Commit, "Attempting to any instructions from rename into " + "skidBuffer.\n"); + + for (int inst_num = 0; inst_num < fromRename->size; ++inst_num) { + DynInstPtr inst = fromRename->insts[inst_num]; + int tid = inst->threadNumber; + + if (!inst->isSquashed()) { + DPRINTF(Commit, "Inserting PC %#x [sn:%i] [tid:%i] into ", + "skidBuffer.\n", inst->readPC(), inst->seqNum, tid); + skidBuffer.push(inst); + } else { + DPRINTF(Commit, "Instruction PC %#x [sn:%i] [tid:%i] was " + "squashed, skipping.\n", + inst->readPC(), inst->seqNum, tid); + } + } +} + +template <class Impl> +void +DefaultCommit<Impl>::markCompletedInsts() +{ + // Grab completed insts out of the IEW instruction queue, and mark + // instructions completed within the ROB. + for (int inst_num = 0; + inst_num < fromIEW->size && fromIEW->insts[inst_num]; + ++inst_num) + { + if (!fromIEW->insts[inst_num]->isSquashed()) { + DPRINTF(Commit, "[tid:%i]: Marking PC %#x, [sn:%lli] ready " + "within ROB.\n", + fromIEW->insts[inst_num]->threadNumber, + fromIEW->insts[inst_num]->readPC(), + fromIEW->insts[inst_num]->seqNum); + + // Mark the instruction as ready to commit. + fromIEW->insts[inst_num]->setCanCommit(); + } + } +} + +template <class Impl> +bool +DefaultCommit<Impl>::robDoneSquashing() +{ + std::list<unsigned>::iterator threads = (*activeThreads).begin(); + + while (threads != (*activeThreads).end()) { + unsigned tid = *threads++; + + if (!rob->isDoneSquashing(tid)) + return false; + } + + return true; +} + +template <class Impl> +void +DefaultCommit<Impl>::updateComInstStats(DynInstPtr &inst) +{ + unsigned thread = inst->threadNumber; + + // + // Pick off the software prefetches + // +#ifdef TARGET_ALPHA + if (inst->isDataPrefetch()) { + statComSwp[thread]++; + } else { + statComInst[thread]++; + } +#else + statComInst[thread]++; +#endif + + // + // Control Instructions + // + if (inst->isControl()) + statComBranches[thread]++; + + // + // Memory references + // + if (inst->isMemRef()) { + statComRefs[thread]++; + + if (inst->isLoad()) { + statComLoads[thread]++; + } + } + + if (inst->isMemBarrier()) { + statComMembars[thread]++; + } +} + +//////////////////////////////////////// +// // +// SMT COMMIT POLICY MAINTAINED HERE // +// // +//////////////////////////////////////// +template <class Impl> +int +DefaultCommit<Impl>::getCommittingThread() +{ + if (numThreads > 1) { + switch (commitPolicy) { + + case Aggressive: + //If Policy is Aggressive, commit will call + //this function multiple times per + //cycle + return oldestReady(); + + case RoundRobin: + return roundRobin(); + + case OldestReady: + return oldestReady(); + + default: + return -1; + } + } else { + int tid = (*activeThreads).front(); + + if (commitStatus[tid] == Running || + commitStatus[tid] == Idle || + commitStatus[tid] == FetchTrapPending) { + return tid; + } else { + return -1; + } + } +} + +template<class Impl> +int +DefaultCommit<Impl>::roundRobin() +{ + std::list<unsigned>::iterator pri_iter = priority_list.begin(); + std::list<unsigned>::iterator end = priority_list.end(); + + while (pri_iter != end) { + unsigned tid = *pri_iter; + + if (commitStatus[tid] == Running || + commitStatus[tid] == Idle || + commitStatus[tid] == FetchTrapPending) { + + if (rob->isHeadReady(tid)) { + priority_list.erase(pri_iter); + priority_list.push_back(tid); + + return tid; + } + } + + pri_iter++; + } + + return -1; +} + +template<class Impl> +int +DefaultCommit<Impl>::oldestReady() +{ + unsigned oldest = 0; + bool first = true; + + std::list<unsigned>::iterator threads = (*activeThreads).begin(); + + while (threads != (*activeThreads).end()) { + unsigned tid = *threads++; + + if (!rob->isEmpty(tid) && + (commitStatus[tid] == Running || + commitStatus[tid] == Idle || + commitStatus[tid] == FetchTrapPending)) { + + if (rob->isHeadReady(tid)) { + + DynInstPtr head_inst = rob->readHeadInst(tid); + + if (first) { + oldest = tid; + first = false; + } else if (head_inst->seqNum < oldest) { + oldest = tid; + } + } + } + } + + if (!first) { + return oldest; + } else { + return -1; + } +} diff --git a/src/cpu/o3/cpu.cc b/src/cpu/o3/cpu.cc new file mode 100644 index 000000000..4279df6f7 --- /dev/null +++ b/src/cpu/o3/cpu.cc @@ -0,0 +1,1437 @@ +/* + * Copyright (c) 2004-2006 The Regents of The University of Michigan + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are + * met: redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer; + * redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution; + * neither the name of the copyright holders nor the names of its + * contributors may be used to endorse or promote products derived from + * this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + * Authors: Kevin Lim + * Korey Sewell + */ + +#include "config/full_system.hh" +#include "config/use_checker.hh" + +#if FULL_SYSTEM +#include "cpu/quiesce_event.hh" +#include "sim/system.hh" +#else +#include "sim/process.hh" +#endif + +#include "cpu/activity.hh" +#include "cpu/simple_thread.hh" +#include "cpu/thread_context.hh" +#include "cpu/o3/isa_specific.hh" +#include "cpu/o3/cpu.hh" + +#include "sim/root.hh" +#include "sim/stat_control.hh" + +#if USE_CHECKER +#include "cpu/checker/cpu.hh" +#endif + +using namespace std; +using namespace TheISA; + +BaseO3CPU::BaseO3CPU(Params *params) + : BaseCPU(params), cpu_id(0) +{ +} + +void +BaseO3CPU::regStats() +{ + BaseCPU::regStats(); +} + +template <class Impl> +FullO3CPU<Impl>::TickEvent::TickEvent(FullO3CPU<Impl> *c) + : Event(&mainEventQueue, CPU_Tick_Pri), cpu(c) +{ +} + +template <class Impl> +void +FullO3CPU<Impl>::TickEvent::process() +{ + cpu->tick(); +} + +template <class Impl> +const char * +FullO3CPU<Impl>::TickEvent::description() +{ + return "FullO3CPU tick event"; +} + +template <class Impl> +FullO3CPU<Impl>::ActivateThreadEvent::ActivateThreadEvent() + : Event(&mainEventQueue, CPU_Tick_Pri) +{ +} + +template <class Impl> +void +FullO3CPU<Impl>::ActivateThreadEvent::init(int thread_num, + FullO3CPU<Impl> *thread_cpu) +{ + tid = thread_num; + cpu = thread_cpu; +} + +template <class Impl> +void +FullO3CPU<Impl>::ActivateThreadEvent::process() +{ + cpu->activateThread(tid); +} + +template <class Impl> +const char * +FullO3CPU<Impl>::ActivateThreadEvent::description() +{ + return "FullO3CPU \"Activate Thread\" event"; +} + +template <class Impl> +FullO3CPU<Impl>::DeallocateContextEvent::DeallocateContextEvent() + : Event(&mainEventQueue, CPU_Tick_Pri) +{ +} + +template <class Impl> +void +FullO3CPU<Impl>::DeallocateContextEvent::init(int thread_num, + FullO3CPU<Impl> *thread_cpu) +{ + tid = thread_num; + cpu = thread_cpu; +} + +template <class Impl> +void +FullO3CPU<Impl>::DeallocateContextEvent::process() +{ + cpu->deactivateThread(tid); + cpu->removeThread(tid); +} + +template <class Impl> +const char * +FullO3CPU<Impl>::DeallocateContextEvent::description() +{ + return "FullO3CPU \"Deallocate Context\" event"; +} + +template <class Impl> +FullO3CPU<Impl>::FullO3CPU(Params *params) + : BaseO3CPU(params), + tickEvent(this), + removeInstsThisCycle(false), + fetch(params), + decode(params), + rename(params), + iew(params), + commit(params), + + regFile(params->numPhysIntRegs, params->numPhysFloatRegs), + + freeList(params->numberOfThreads, + TheISA::NumIntRegs, params->numPhysIntRegs, + TheISA::NumFloatRegs, params->numPhysFloatRegs), + + rob(params->numROBEntries, params->squashWidth, + params->smtROBPolicy, params->smtROBThreshold, + params->numberOfThreads), + + scoreboard(params->numberOfThreads, + TheISA::NumIntRegs, params->numPhysIntRegs, + TheISA::NumFloatRegs, params->numPhysFloatRegs, + TheISA::NumMiscRegs * number_of_threads, + TheISA::ZeroReg), + + timeBuffer(params->backComSize, params->forwardComSize), + fetchQueue(params->backComSize, params->forwardComSize), + decodeQueue(params->backComSize, params->forwardComSize), + renameQueue(params->backComSize, params->forwardComSize), + iewQueue(params->backComSize, params->forwardComSize), + activityRec(NumStages, + params->backComSize + params->forwardComSize, + params->activity), + + globalSeqNum(1), +#if FULL_SYSTEM + system(params->system), + physmem(system->physmem), +#endif // FULL_SYSTEM + mem(params->mem), + drainCount(0), + deferRegistration(params->deferRegistration), + numThreads(number_of_threads) +{ + _status = Idle; + + checker = NULL; + + if (params->checker) { +#if USE_CHECKER + BaseCPU *temp_checker = params->checker; + checker = dynamic_cast<Checker<DynInstPtr> *>(temp_checker); + checker->setMemory(mem); +#if FULL_SYSTEM + checker->setSystem(params->system); +#endif +#else + panic("Checker enabled but not compiled in!"); +#endif // USE_CHECKER + } + +#if !FULL_SYSTEM + thread.resize(number_of_threads); + tids.resize(number_of_threads); +#endif + + // The stages also need their CPU pointer setup. However this + // must be done at the upper level CPU because they have pointers + // to the upper level CPU, and not this FullO3CPU. + + // Set up Pointers to the activeThreads list for each stage + fetch.setActiveThreads(&activeThreads); + decode.setActiveThreads(&activeThreads); + rename.setActiveThreads(&activeThreads); + iew.setActiveThreads(&activeThreads); + commit.setActiveThreads(&activeThreads); + + // Give each of the stages the time buffer they will use. + fetch.setTimeBuffer(&timeBuffer); + decode.setTimeBuffer(&timeBuffer); + rename.setTimeBuffer(&timeBuffer); + iew.setTimeBuffer(&timeBuffer); + commit.setTimeBuffer(&timeBuffer); + + // Also setup each of the stages' queues. + fetch.setFetchQueue(&fetchQueue); + decode.setFetchQueue(&fetchQueue); + commit.setFetchQueue(&fetchQueue); + decode.setDecodeQueue(&decodeQueue); + rename.setDecodeQueue(&decodeQueue); + rename.setRenameQueue(&renameQueue); + iew.setRenameQueue(&renameQueue); + iew.setIEWQueue(&iewQueue); + commit.setIEWQueue(&iewQueue); + commit.setRenameQueue(&renameQueue); + + commit.setIEWStage(&iew); + rename.setIEWStage(&iew); + rename.setCommitStage(&commit); + +#if !FULL_SYSTEM + int active_threads = params->workload.size(); + + if (active_threads > Impl::MaxThreads) { + panic("Workload Size too large. Increase the 'MaxThreads'" + "constant in your O3CPU impl. file (e.g. o3/alpha/impl.hh) or " + "edit your workload size."); + } +#else + int active_threads = 1; +#endif + + //Make Sure That this a Valid Architeture + assert(params->numPhysIntRegs >= numThreads * TheISA::NumIntRegs); + assert(params->numPhysFloatRegs >= numThreads * TheISA::NumFloatRegs); + + rename.setScoreboard(&scoreboard); + iew.setScoreboard(&scoreboard); + + // Setup the rename map for whichever stages need it. + PhysRegIndex lreg_idx = 0; + PhysRegIndex freg_idx = params->numPhysIntRegs; //Index to 1 after int regs + + for (int tid=0; tid < numThreads; tid++) { + bool bindRegs = (tid <= active_threads - 1); + + commitRenameMap[tid].init(TheISA::NumIntRegs, + params->numPhysIntRegs, + lreg_idx, //Index for Logical. Regs + + TheISA::NumFloatRegs, + params->numPhysFloatRegs, + freg_idx, //Index for Float Regs + + TheISA::NumMiscRegs, + + TheISA::ZeroReg, + TheISA::ZeroReg, + + tid, + false); + + renameMap[tid].init(TheISA::NumIntRegs, + params->numPhysIntRegs, + lreg_idx, //Index for Logical. Regs + + TheISA::NumFloatRegs, + params->numPhysFloatRegs, + freg_idx, //Index for Float Regs + + TheISA::NumMiscRegs, + + TheISA::ZeroReg, + TheISA::ZeroReg, + + tid, + bindRegs); + } + + rename.setRenameMap(renameMap); + commit.setRenameMap(commitRenameMap); + + // Give renameMap & rename stage access to the freeList; + for (int i=0; i < numThreads; i++) { + renameMap[i].setFreeList(&freeList); + } + rename.setFreeList(&freeList); + + // Setup the ROB for whichever stages need it. + commit.setROB(&rob); + + lastRunningCycle = curTick; + + lastActivatedCycle = -1; + + // Give renameMap & rename stage access to the freeList; + //for (int i=0; i < numThreads; i++) { + //globalSeqNum[i] = 1; + //} + + contextSwitch = false; +} + +template <class Impl> +FullO3CPU<Impl>::~FullO3CPU() +{ +} + +template <class Impl> +void +FullO3CPU<Impl>::fullCPURegStats() +{ + BaseO3CPU::regStats(); + + // Register any of the O3CPU's stats here. + timesIdled + .name(name() + ".timesIdled") + .desc("Number of times that the entire CPU went into an idle state and" + " unscheduled itself") + .prereq(timesIdled); + + idleCycles + .name(name() + ".idleCycles") + .desc("Total number of cycles that the CPU has spent unscheduled due " + "to idling") + .prereq(idleCycles); + + // Number of Instructions simulated + // -------------------------------- + // Should probably be in Base CPU but need templated + // MaxThreads so put in here instead + committedInsts + .init(numThreads) + .name(name() + ".committedInsts") + .desc("Number of Instructions Simulated"); + + totalCommittedInsts + .name(name() + ".committedInsts_total") + .desc("Number of Instructions Simulated"); + + cpi + .name(name() + ".cpi") + .desc("CPI: Cycles Per Instruction") + .precision(6); + cpi = simTicks / committedInsts; + + totalCpi + .name(name() + ".cpi_total") + .desc("CPI: Total CPI of All Threads") + .precision(6); + totalCpi = simTicks / totalCommittedInsts; + + ipc + .name(name() + ".ipc") + .desc("IPC: Instructions Per Cycle") + .precision(6); + ipc = committedInsts / simTicks; + + totalIpc + .name(name() + ".ipc_total") + .desc("IPC: Total IPC of All Threads") + .precision(6); + totalIpc = totalCommittedInsts / simTicks; + +} + +template <class Impl> +Port * +FullO3CPU<Impl>::getPort(const std::string &if_name, int idx) +{ + if (if_name == "dcache_port") + return iew.getDcachePort(); + else if (if_name == "icache_port") + return fetch.getIcachePort(); + else + panic("No Such Port\n"); +} + +template <class Impl> +void +FullO3CPU<Impl>::tick() +{ + DPRINTF(O3CPU, "\n\nFullO3CPU: Ticking main, FullO3CPU.\n"); + + ++numCycles; + +// activity = false; + + //Tick each of the stages + fetch.tick(); + + decode.tick(); + + rename.tick(); + + iew.tick(); + + commit.tick(); + +#if !FULL_SYSTEM + doContextSwitch(); +#endif + + // Now advance the time buffers + timeBuffer.advance(); + + fetchQueue.advance(); + decodeQueue.advance(); + renameQueue.advance(); + iewQueue.advance(); + + activityRec.advance(); + + if (removeInstsThisCycle) { + cleanUpRemovedInsts(); + } + + if (!tickEvent.scheduled()) { + if (_status == SwitchedOut || + getState() == SimObject::Drained) { + // increment stat + lastRunningCycle = curTick; + } else if (!activityRec.active()) { + lastRunningCycle = curTick; + timesIdled++; + } else { + tickEvent.schedule(curTick + cycles(1)); + } + } + +#if !FULL_SYSTEM + updateThreadPriority(); +#endif + +} + +template <class Impl> +void +FullO3CPU<Impl>::init() +{ + if (!deferRegistration) { + registerThreadContexts(); + } + + // Set inSyscall so that the CPU doesn't squash when initially + // setting up registers. + for (int i = 0; i < number_of_threads; ++i) + thread[i]->inSyscall = true; + + for (int tid=0; tid < number_of_threads; tid++) { +#if FULL_SYSTEM + ThreadContext *src_tc = threadContexts[tid]; +#else + ThreadContext *src_tc = thread[tid]->getTC(); +#endif + // Threads start in the Suspended State + if (src_tc->status() != ThreadContext::Suspended) { + continue; + } + +#if FULL_SYSTEM + TheISA::initCPU(src_tc, src_tc->readCpuId()); +#endif + } + + // Clear inSyscall. + for (int i = 0; i < number_of_threads; ++i) + thread[i]->inSyscall = false; + + // Initialize stages. + fetch.initStage(); + iew.initStage(); + rename.initStage(); + commit.initStage(); + + commit.setThreads(thread); +} + +template <class Impl> +void +FullO3CPU<Impl>::activateThread(unsigned tid) +{ + list<unsigned>::iterator isActive = find( + activeThreads.begin(), activeThreads.end(), tid); + + if (isActive == activeThreads.end()) { + DPRINTF(O3CPU, "[tid:%i]: Adding to active threads list\n", + tid); + + activeThreads.push_back(tid); + } +} + +template <class Impl> +void +FullO3CPU<Impl>::deactivateThread(unsigned tid) +{ + //Remove From Active List, if Active + list<unsigned>::iterator thread_it = + find(activeThreads.begin(), activeThreads.end(), tid); + + if (thread_it != activeThreads.end()) { + DPRINTF(O3CPU,"[tid:%i]: Removing from active threads list\n", + tid); + activeThreads.erase(thread_it); + } +} + +template <class Impl> +void +FullO3CPU<Impl>::activateContext(int tid, int delay) +{ + // Needs to set each stage to running as well. + if (delay){ + DPRINTF(O3CPU, "[tid:%i]: Scheduling thread context to activate " + "on cycle %d\n", tid, curTick + cycles(delay)); + scheduleActivateThreadEvent(tid, delay); + } else { + activateThread(tid); + } + + if(lastActivatedCycle < curTick) { + scheduleTickEvent(delay); + + // Be sure to signal that there's some activity so the CPU doesn't + // deschedule itself. + activityRec.activity(); + fetch.wakeFromQuiesce(); + + lastActivatedCycle = curTick; + + _status = Running; + } +} + +template <class Impl> +void +FullO3CPU<Impl>::deallocateContext(int tid, int delay) +{ + // Schedule removal of thread data from CPU + if (delay){ + DPRINTF(O3CPU, "[tid:%i]: Scheduling thread context to deallocate " + "on cycle %d\n", tid, curTick + cycles(delay)); + scheduleDeallocateContextEvent(tid, delay); + } else { + deactivateThread(tid); + removeThread(tid); + } +} + +template <class Impl> +void +FullO3CPU<Impl>::suspendContext(int tid) +{ + DPRINTF(O3CPU,"[tid: %i]: Suspending Thread Context.\n", tid); + deactivateThread(tid); + if (activeThreads.size() == 0) + unscheduleTickEvent(); + _status = Idle; +} + +template <class Impl> +void +FullO3CPU<Impl>::haltContext(int tid) +{ + //For now, this is the same as deallocate + DPRINTF(O3CPU,"[tid:%i]: Halt Context called. Deallocating", tid); + deallocateContext(tid, 1); +} + +template <class Impl> +void +FullO3CPU<Impl>::insertThread(unsigned tid) +{ + DPRINTF(O3CPU,"[tid:%i] Initializing thread into CPU"); + // Will change now that the PC and thread state is internal to the CPU + // and not in the ThreadContext. +#if FULL_SYSTEM + ThreadContext *src_tc = system->threadContexts[tid]; +#else + ThreadContext *src_tc = tcBase(tid); +#endif + + //Bind Int Regs to Rename Map + for (int ireg = 0; ireg < TheISA::NumIntRegs; ireg++) { + PhysRegIndex phys_reg = freeList.getIntReg(); + + renameMap[tid].setEntry(ireg,phys_reg); + scoreboard.setReg(phys_reg); + } + + //Bind Float Regs to Rename Map + for (int freg = 0; freg < TheISA::NumFloatRegs; freg++) { + PhysRegIndex phys_reg = freeList.getFloatReg(); + + renameMap[tid].setEntry(freg,phys_reg); + scoreboard.setReg(phys_reg); + } + + //Copy Thread Data Into RegFile + //this->copyFromTC(tid); + + //Set PC/NPC/NNPC + setPC(src_tc->readPC(), tid); + setNextPC(src_tc->readNextPC(), tid); +#if ISA_HAS_DELAY_SLOT + setNextNPC(src_tc->readNextNPC(), tid); +#endif + + src_tc->setStatus(ThreadContext::Active); + + activateContext(tid,1); + + //Reset ROB/IQ/LSQ Entries + commit.rob->resetEntries(); + iew.resetEntries(); +} + +template <class Impl> +void +FullO3CPU<Impl>::removeThread(unsigned tid) +{ + DPRINTF(O3CPU,"[tid:%i] Removing thread context from CPU.\n", tid); + + // Copy Thread Data From RegFile + // If thread is suspended, it might be re-allocated + //this->copyToTC(tid); + + // Unbind Int Regs from Rename Map + for (int ireg = 0; ireg < TheISA::NumIntRegs; ireg++) { + PhysRegIndex phys_reg = renameMap[tid].lookup(ireg); + + scoreboard.unsetReg(phys_reg); + freeList.addReg(phys_reg); + } + + // Unbind Float Regs from Rename Map + for (int freg = 0; freg < TheISA::NumFloatRegs; freg++) { + PhysRegIndex phys_reg = renameMap[tid].lookup(freg); + + scoreboard.unsetReg(phys_reg); + freeList.addReg(phys_reg); + } + + // Squash Throughout Pipeline + InstSeqNum squash_seq_num = commit.rob->readHeadInst(tid)->seqNum; + fetch.squash(0, squash_seq_num, true, tid); + decode.squash(tid); + rename.squash(squash_seq_num, tid); + iew.squash(tid); + commit.rob->squash(squash_seq_num, tid); + + assert(iew.ldstQueue.getCount(tid) == 0); + + // Reset ROB/IQ/LSQ Entries + if (activeThreads.size() >= 1) { + commit.rob->resetEntries(); + iew.resetEntries(); + } +} + + +template <class Impl> +void +FullO3CPU<Impl>::activateWhenReady(int tid) +{ + DPRINTF(O3CPU,"[tid:%i]: Checking if resources are available for incoming" + "(e.g. PhysRegs/ROB/IQ/LSQ) \n", + tid); + + bool ready = true; + + if (freeList.numFreeIntRegs() >= TheISA::NumIntRegs) { + DPRINTF(O3CPU,"[tid:%i] Suspending thread due to not enough " + "Phys. Int. Regs.\n", + tid); + ready = false; + } else if (freeList.numFreeFloatRegs() >= TheISA::NumFloatRegs) { + DPRINTF(O3CPU,"[tid:%i] Suspending thread due to not enough " + "Phys. Float. Regs.\n", + tid); + ready = false; + } else if (commit.rob->numFreeEntries() >= + commit.rob->entryAmount(activeThreads.size() + 1)) { + DPRINTF(O3CPU,"[tid:%i] Suspending thread due to not enough " + "ROB entries.\n", + tid); + ready = false; + } else if (iew.instQueue.numFreeEntries() >= + iew.instQueue.entryAmount(activeThreads.size() + 1)) { + DPRINTF(O3CPU,"[tid:%i] Suspending thread due to not enough " + "IQ entries.\n", + tid); + ready = false; + } else if (iew.ldstQueue.numFreeEntries() >= + iew.ldstQueue.entryAmount(activeThreads.size() + 1)) { + DPRINTF(O3CPU,"[tid:%i] Suspending thread due to not enough " + "LSQ entries.\n", + tid); + ready = false; + } + + if (ready) { + insertThread(tid); + + contextSwitch = false; + + cpuWaitList.remove(tid); + } else { + suspendContext(tid); + + //blocks fetch + contextSwitch = true; + + //@todo: dont always add to waitlist + //do waitlist + cpuWaitList.push_back(tid); + } +} + +template <class Impl> +void +FullO3CPU<Impl>::serialize(std::ostream &os) +{ + SimObject::State so_state = SimObject::getState(); + SERIALIZE_ENUM(so_state); + BaseCPU::serialize(os); + nameOut(os, csprintf("%s.tickEvent", name())); + tickEvent.serialize(os); + + // Use SimpleThread's ability to checkpoint to make it easier to + // write out the registers. Also make this static so it doesn't + // get instantiated multiple times (causes a panic in statistics). + static SimpleThread temp; + + for (int i = 0; i < thread.size(); i++) { + nameOut(os, csprintf("%s.xc.%i", name(), i)); + temp.copyTC(thread[i]->getTC()); + temp.serialize(os); + } +} + +template <class Impl> +void +FullO3CPU<Impl>::unserialize(Checkpoint *cp, const std::string §ion) +{ + SimObject::State so_state; + UNSERIALIZE_ENUM(so_state); + BaseCPU::unserialize(cp, section); + tickEvent.unserialize(cp, csprintf("%s.tickEvent", section)); + + // Use SimpleThread's ability to checkpoint to make it easier to + // read in the registers. Also make this static so it doesn't + // get instantiated multiple times (causes a panic in statistics). + static SimpleThread temp; + + for (int i = 0; i < thread.size(); i++) { + temp.copyTC(thread[i]->getTC()); + temp.unserialize(cp, csprintf("%s.xc.%i", section, i)); + thread[i]->getTC()->copyArchRegs(temp.getTC()); + } +} + +template <class Impl> +unsigned int +FullO3CPU<Impl>::drain(Event *drain_event) +{ + DPRINTF(O3CPU, "Switching out\n"); + BaseCPU::switchOut(_sampler); + drainCount = 0; + fetch.drain(); + decode.drain(); + rename.drain(); + iew.drain(); + commit.drain(); + + // Wake the CPU and record activity so everything can drain out if + // the CPU was not able to immediately drain. + if (getState() != SimObject::Drained) { + // A bit of a hack...set the drainEvent after all the drain() + // calls have been made, that way if all of the stages drain + // immediately, the signalDrained() function knows not to call + // process on the drain event. + drainEvent = drain_event; + + wakeCPU(); + activityRec.activity(); + + return 1; + } else { + return 0; + } +} + +template <class Impl> +void +FullO3CPU<Impl>::resume() +{ + assert(system->getMemoryMode() == System::Timing); + fetch.resume(); + decode.resume(); + rename.resume(); + iew.resume(); + commit.resume(); + + changeState(SimObject::Running); + + if (_status == SwitchedOut || _status == Idle) + return; + + if (!tickEvent.scheduled()) + tickEvent.schedule(curTick); + _status = Running; +} + +template <class Impl> +void +FullO3CPU<Impl>::signalDrained() +{ + if (++drainCount == NumStages) { + if (tickEvent.scheduled()) + tickEvent.squash(); + + changeState(SimObject::Drained); + + if (drainEvent) { + drainEvent->process(); + drainEvent = NULL; + } + } + assert(drainCount <= 5); +} + +template <class Impl> +void +FullO3CPU<Impl>::switchOut() +{ + fetch.switchOut(); + rename.switchOut(); + iew.switchOut(); + commit.switchOut(); + instList.clear(); + while (!removeList.empty()) { + removeList.pop(); + } + + _status = SwitchedOut; +#if USE_CHECKER + if (checker) + checker->switchOut(); +#endif +} + +template <class Impl> +void +FullO3CPU<Impl>::takeOverFrom(BaseCPU *oldCPU) +{ + // Flush out any old data from the time buffers. + for (int i = 0; i < timeBuffer.getSize(); ++i) { + timeBuffer.advance(); + fetchQueue.advance(); + decodeQueue.advance(); + renameQueue.advance(); + iewQueue.advance(); + } + + activityRec.reset(); + + BaseCPU::takeOverFrom(oldCPU); + + fetch.takeOverFrom(); + decode.takeOverFrom(); + rename.takeOverFrom(); + iew.takeOverFrom(); + commit.takeOverFrom(); + + assert(!tickEvent.scheduled()); + + // @todo: Figure out how to properly select the tid to put onto + // the active threads list. + int tid = 0; + + list<unsigned>::iterator isActive = find( + activeThreads.begin(), activeThreads.end(), tid); + + if (isActive == activeThreads.end()) { + //May Need to Re-code this if the delay variable is the delay + //needed for thread to activate + DPRINTF(O3CPU, "Adding Thread %i to active threads list\n", + tid); + + activeThreads.push_back(tid); + } + + // Set all statuses to active, schedule the CPU's tick event. + // @todo: Fix up statuses so this is handled properly + for (int i = 0; i < threadContexts.size(); ++i) { + ThreadContext *tc = threadContexts[i]; + if (tc->status() == ThreadContext::Active && _status != Running) { + _status = Running; + tickEvent.schedule(curTick); + } + } + if (!tickEvent.scheduled()) + tickEvent.schedule(curTick); +} + +template <class Impl> +void +FullO3CPU<Impl>::serialize(std::ostream &os) +{ + BaseCPU::serialize(os); + nameOut(os, csprintf("%s.tickEvent", name())); + tickEvent.serialize(os); + + // Use SimpleThread's ability to checkpoint to make it easier to + // write out the registers. Also make this static so it doesn't + // get instantiated multiple times (causes a panic in statistics). + static CPUExecContext temp; + + for (int i = 0; i < thread.size(); i++) { + nameOut(os, csprintf("%s.xc.%i", name(), i)); + temp.copyXC(thread[i]->getXCProxy()); + temp.serialize(os); + } +} + +template <class Impl> +void +FullO3CPU<Impl>::unserialize(Checkpoint *cp, const std::string §ion) +{ + BaseCPU::unserialize(cp, section); + tickEvent.unserialize(cp, csprintf("%s.tickEvent", section)); + + // Use SimpleThread's ability to checkpoint to make it easier to + // read in the registers. Also make this static so it doesn't + // get instantiated multiple times (causes a panic in statistics). + static CPUExecContext temp; + + for (int i = 0; i < thread.size(); i++) { + temp.copyXC(thread[i]->getXCProxy()); + temp.unserialize(cp, csprintf("%s.xc.%i", section, i)); + thread[i]->getXCProxy()->copyArchRegs(temp.getProxy()); + } +} + +template <class Impl> +uint64_t +FullO3CPU<Impl>::readIntReg(int reg_idx) +{ + return regFile.readIntReg(reg_idx); +} + +template <class Impl> +FloatReg +FullO3CPU<Impl>::readFloatReg(int reg_idx, int width) +{ + return regFile.readFloatReg(reg_idx, width); +} + +template <class Impl> +FloatReg +FullO3CPU<Impl>::readFloatReg(int reg_idx) +{ + return regFile.readFloatReg(reg_idx); +} + +template <class Impl> +FloatRegBits +FullO3CPU<Impl>::readFloatRegBits(int reg_idx, int width) +{ + return regFile.readFloatRegBits(reg_idx, width); +} + +template <class Impl> +FloatRegBits +FullO3CPU<Impl>::readFloatRegBits(int reg_idx) +{ + return regFile.readFloatRegBits(reg_idx); +} + +template <class Impl> +void +FullO3CPU<Impl>::setIntReg(int reg_idx, uint64_t val) +{ + regFile.setIntReg(reg_idx, val); +} + +template <class Impl> +void +FullO3CPU<Impl>::setFloatReg(int reg_idx, FloatReg val, int width) +{ + regFile.setFloatReg(reg_idx, val, width); +} + +template <class Impl> +void +FullO3CPU<Impl>::setFloatReg(int reg_idx, FloatReg val) +{ + regFile.setFloatReg(reg_idx, val); +} + +template <class Impl> +void +FullO3CPU<Impl>::setFloatRegBits(int reg_idx, FloatRegBits val, int width) +{ + regFile.setFloatRegBits(reg_idx, val, width); +} + +template <class Impl> +void +FullO3CPU<Impl>::setFloatRegBits(int reg_idx, FloatRegBits val) +{ + regFile.setFloatRegBits(reg_idx, val); +} + +template <class Impl> +uint64_t +FullO3CPU<Impl>::readArchIntReg(int reg_idx, unsigned tid) +{ + PhysRegIndex phys_reg = commitRenameMap[tid].lookup(reg_idx); + + return regFile.readIntReg(phys_reg); +} + +template <class Impl> +float +FullO3CPU<Impl>::readArchFloatRegSingle(int reg_idx, unsigned tid) +{ + int idx = reg_idx + TheISA::FP_Base_DepTag; + PhysRegIndex phys_reg = commitRenameMap[tid].lookup(idx); + + return regFile.readFloatReg(phys_reg); +} + +template <class Impl> +double +FullO3CPU<Impl>::readArchFloatRegDouble(int reg_idx, unsigned tid) +{ + int idx = reg_idx + TheISA::FP_Base_DepTag; + PhysRegIndex phys_reg = commitRenameMap[tid].lookup(idx); + + return regFile.readFloatReg(phys_reg, 64); +} + +template <class Impl> +uint64_t +FullO3CPU<Impl>::readArchFloatRegInt(int reg_idx, unsigned tid) +{ + int idx = reg_idx + TheISA::FP_Base_DepTag; + PhysRegIndex phys_reg = commitRenameMap[tid].lookup(idx); + + return regFile.readFloatRegBits(phys_reg); +} + +template <class Impl> +void +FullO3CPU<Impl>::setArchIntReg(int reg_idx, uint64_t val, unsigned tid) +{ + PhysRegIndex phys_reg = commitRenameMap[tid].lookup(reg_idx); + + regFile.setIntReg(phys_reg, val); +} + +template <class Impl> +void +FullO3CPU<Impl>::setArchFloatRegSingle(int reg_idx, float val, unsigned tid) +{ + int idx = reg_idx + TheISA::FP_Base_DepTag; + PhysRegIndex phys_reg = commitRenameMap[tid].lookup(idx); + + regFile.setFloatReg(phys_reg, val); +} + +template <class Impl> +void +FullO3CPU<Impl>::setArchFloatRegDouble(int reg_idx, double val, unsigned tid) +{ + int idx = reg_idx + TheISA::FP_Base_DepTag; + PhysRegIndex phys_reg = commitRenameMap[tid].lookup(idx); + + regFile.setFloatReg(phys_reg, val, 64); +} + +template <class Impl> +void +FullO3CPU<Impl>::setArchFloatRegInt(int reg_idx, uint64_t val, unsigned tid) +{ + int idx = reg_idx + TheISA::FP_Base_DepTag; + PhysRegIndex phys_reg = commitRenameMap[tid].lookup(idx); + + regFile.setFloatRegBits(phys_reg, val); +} + +template <class Impl> +uint64_t +FullO3CPU<Impl>::readPC(unsigned tid) +{ + return commit.readPC(tid); +} + +template <class Impl> +void +FullO3CPU<Impl>::setPC(Addr new_PC,unsigned tid) +{ + commit.setPC(new_PC, tid); +} + +template <class Impl> +uint64_t +FullO3CPU<Impl>::readNextPC(unsigned tid) +{ + return commit.readNextPC(tid); +} + +template <class Impl> +void +FullO3CPU<Impl>::setNextPC(uint64_t val,unsigned tid) +{ + commit.setNextPC(val, tid); +} + +template <class Impl> +uint64_t +FullO3CPU<Impl>::readNextNPC(unsigned tid) +{ + return commit.readNextNPC(tid); +} + +template <class Impl> +void +FullO3CPU<Impl>::setNextNPC(uint64_t val,unsigned tid) +{ + commit.setNextNPC(val, tid); +} + +template <class Impl> +typename FullO3CPU<Impl>::ListIt +FullO3CPU<Impl>::addInst(DynInstPtr &inst) +{ + instList.push_back(inst); + + return --(instList.end()); +} + +template <class Impl> +void +FullO3CPU<Impl>::instDone(unsigned tid) +{ + // Keep an instruction count. + thread[tid]->numInst++; + thread[tid]->numInsts++; + committedInsts[tid]++; + totalCommittedInsts++; + + // Check for instruction-count-based events. + comInstEventQueue[tid]->serviceEvents(thread[tid]->numInst); +} + +template <class Impl> +void +FullO3CPU<Impl>::addToRemoveList(DynInstPtr &inst) +{ + removeInstsThisCycle = true; + + removeList.push(inst->getInstListIt()); +} + +template <class Impl> +void +FullO3CPU<Impl>::removeFrontInst(DynInstPtr &inst) +{ + DPRINTF(O3CPU, "Removing committed instruction [tid:%i] PC %#x " + "[sn:%lli]\n", + inst->threadNumber, inst->readPC(), inst->seqNum); + + removeInstsThisCycle = true; + + // Remove the front instruction. + removeList.push(inst->getInstListIt()); +} + +template <class Impl> +void +FullO3CPU<Impl>::removeInstsNotInROB(unsigned tid, + bool squash_delay_slot, + const InstSeqNum &delay_slot_seq_num) +{ + DPRINTF(O3CPU, "Thread %i: Deleting instructions from instruction" + " list.\n", tid); + + ListIt end_it; + + bool rob_empty = false; + + if (instList.empty()) { + return; + } else if (rob.isEmpty(/*tid*/)) { + DPRINTF(O3CPU, "ROB is empty, squashing all insts.\n"); + end_it = instList.begin(); + rob_empty = true; + } else { + end_it = (rob.readTailInst(tid))->getInstListIt(); + DPRINTF(O3CPU, "ROB is not empty, squashing insts not in ROB.\n"); + } + + removeInstsThisCycle = true; + + ListIt inst_it = instList.end(); + + inst_it--; + + // Walk through the instruction list, removing any instructions + // that were inserted after the given instruction iterator, end_it. + while (inst_it != end_it) { + assert(!instList.empty()); + +#if ISA_HAS_DELAY_SLOT + if(!squash_delay_slot && + delay_slot_seq_num >= (*inst_it)->seqNum) { + break; + } +#endif + squashInstIt(inst_it, tid); + + inst_it--; + } + + // If the ROB was empty, then we actually need to remove the first + // instruction as well. + if (rob_empty) { + squashInstIt(inst_it, tid); + } +} + +template <class Impl> +void +FullO3CPU<Impl>::removeInstsUntil(const InstSeqNum &seq_num, + unsigned tid) +{ + assert(!instList.empty()); + + removeInstsThisCycle = true; + + ListIt inst_iter = instList.end(); + + inst_iter--; + + DPRINTF(O3CPU, "Deleting instructions from instruction " + "list that are from [tid:%i] and above [sn:%lli] (end=%lli).\n", + tid, seq_num, (*inst_iter)->seqNum); + + while ((*inst_iter)->seqNum > seq_num) { + + bool break_loop = (inst_iter == instList.begin()); + + squashInstIt(inst_iter, tid); + + inst_iter--; + + if (break_loop) + break; + } +} + +template <class Impl> +inline void +FullO3CPU<Impl>::squashInstIt(const ListIt &instIt, const unsigned &tid) +{ + if ((*instIt)->threadNumber == tid) { + DPRINTF(O3CPU, "Squashing instruction, " + "[tid:%i] [sn:%lli] PC %#x\n", + (*instIt)->threadNumber, + (*instIt)->seqNum, + (*instIt)->readPC()); + + // Mark it as squashed. + (*instIt)->setSquashed(); + + // @todo: Formulate a consistent method for deleting + // instructions from the instruction list + // Remove the instruction from the list. + removeList.push(instIt); + } +} + +template <class Impl> +void +FullO3CPU<Impl>::cleanUpRemovedInsts() +{ + while (!removeList.empty()) { + DPRINTF(O3CPU, "Removing instruction, " + "[tid:%i] [sn:%lli] PC %#x\n", + (*removeList.front())->threadNumber, + (*removeList.front())->seqNum, + (*removeList.front())->readPC()); + + instList.erase(removeList.front()); + + removeList.pop(); + } + + removeInstsThisCycle = false; +} +/* +template <class Impl> +void +FullO3CPU<Impl>::removeAllInsts() +{ + instList.clear(); +} +*/ +template <class Impl> +void +FullO3CPU<Impl>::dumpInsts() +{ + int num = 0; + + ListIt inst_list_it = instList.begin(); + + cprintf("Dumping Instruction List\n"); + + while (inst_list_it != instList.end()) { + cprintf("Instruction:%i\nPC:%#x\n[tid:%i]\n[sn:%lli]\nIssued:%i\n" + "Squashed:%i\n\n", + num, (*inst_list_it)->readPC(), (*inst_list_it)->threadNumber, + (*inst_list_it)->seqNum, (*inst_list_it)->isIssued(), + (*inst_list_it)->isSquashed()); + inst_list_it++; + ++num; + } +} +/* +template <class Impl> +void +FullO3CPU<Impl>::wakeDependents(DynInstPtr &inst) +{ + iew.wakeDependents(inst); +} +*/ +template <class Impl> +void +FullO3CPU<Impl>::wakeCPU() +{ + if (activityRec.active() || tickEvent.scheduled()) { + DPRINTF(Activity, "CPU already running.\n"); + return; + } + + DPRINTF(Activity, "Waking up CPU\n"); + + idleCycles += (curTick - 1) - lastRunningCycle; + + tickEvent.schedule(curTick); +} + +template <class Impl> +int +FullO3CPU<Impl>::getFreeTid() +{ + for (int i=0; i < numThreads; i++) { + if (!tids[i]) { + tids[i] = true; + return i; + } + } + + return -1; +} + +template <class Impl> +void +FullO3CPU<Impl>::doContextSwitch() +{ + if (contextSwitch) { + + //ADD CODE TO DEACTIVE THREAD HERE (???) + + for (int tid=0; tid < cpuWaitList.size(); tid++) { + activateWhenReady(tid); + } + + if (cpuWaitList.size() == 0) + contextSwitch = true; + } +} + +template <class Impl> +void +FullO3CPU<Impl>::updateThreadPriority() +{ + if (activeThreads.size() > 1) + { + //DEFAULT TO ROUND ROBIN SCHEME + //e.g. Move highest priority to end of thread list + list<unsigned>::iterator list_begin = activeThreads.begin(); + list<unsigned>::iterator list_end = activeThreads.end(); + + unsigned high_thread = *list_begin; + + activeThreads.erase(list_begin); + + activeThreads.push_back(high_thread); + } +} + +// Forward declaration of FullO3CPU. +template class FullO3CPU<O3CPUImpl>; diff --git a/src/cpu/o3/cpu.hh b/src/cpu/o3/cpu.hh new file mode 100644 index 000000000..dcdcd1fe6 --- /dev/null +++ b/src/cpu/o3/cpu.hh @@ -0,0 +1,676 @@ +/* + * Copyright (c) 2004-2005 The Regents of The University of Michigan + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are + * met: redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer; + * redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution; + * neither the name of the copyright holders nor the names of its + * contributors may be used to endorse or promote products derived from + * this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + * Authors: Kevin Lim + * Korey Sewell + */ + +#ifndef __CPU_O3_CPU_HH__ +#define __CPU_O3_CPU_HH__ + +#include <iostream> +#include <list> +#include <queue> +#include <set> +#include <vector> + +#include "arch/types.hh" +#include "base/statistics.hh" +#include "base/timebuf.hh" +#include "config/full_system.hh" +#include "cpu/activity.hh" +#include "cpu/base.hh" +#include "cpu/simple_thread.hh" +#include "cpu/o3/comm.hh" +#include "cpu/o3/cpu_policy.hh" +#include "cpu/o3/scoreboard.hh" +#include "cpu/o3/thread_state.hh" +//#include "cpu/o3/thread_context.hh" +#include "sim/process.hh" + +template <class> +class Checker; +class ThreadContext; +template <class> +class O3ThreadContext; + +class Checkpoint; +class MemObject; +class Process; + +class BaseO3CPU : public BaseCPU +{ + //Stuff that's pretty ISA independent will go here. + public: + typedef BaseCPU::Params Params; + + BaseO3CPU(Params *params); + + void regStats(); + + /** Sets this CPU's ID. */ + void setCpuId(int id) { cpu_id = id; } + + /** Reads this CPU's ID. */ + int readCpuId() { return cpu_id; } + + protected: + int cpu_id; +}; + +/** + * FullO3CPU class, has each of the stages (fetch through commit) + * within it, as well as all of the time buffers between stages. The + * tick() function for the CPU is defined here. + */ +template <class Impl> +class FullO3CPU : public BaseO3CPU +{ + public: + typedef TheISA::FloatReg FloatReg; + typedef TheISA::FloatRegBits FloatRegBits; + + // Typedefs from the Impl here. + typedef typename Impl::CPUPol CPUPolicy; + typedef typename Impl::Params Params; + typedef typename Impl::DynInstPtr DynInstPtr; + + typedef O3ThreadState<Impl> Thread; + + typedef typename std::list<DynInstPtr>::iterator ListIt; + + friend class O3ThreadContext<Impl>; + + public: + enum Status { + Running, + Idle, + Halted, + Blocked, + SwitchedOut + }; + + /** Overall CPU status. */ + Status _status; + + /** Per-thread status in CPU, used for SMT. */ + Status _threadStatus[Impl::MaxThreads]; + + private: + class TickEvent : public Event + { + private: + /** Pointer to the CPU. */ + FullO3CPU<Impl> *cpu; + + public: + /** Constructs a tick event. */ + TickEvent(FullO3CPU<Impl> *c); + + /** Processes a tick event, calling tick() on the CPU. */ + void process(); + /** Returns the description of the tick event. */ + const char *description(); + }; + + /** The tick event used for scheduling CPU ticks. */ + TickEvent tickEvent; + + /** Schedule tick event, regardless of its current state. */ + void scheduleTickEvent(int delay) + { + if (tickEvent.squashed()) + tickEvent.reschedule(curTick + cycles(delay)); + else if (!tickEvent.scheduled()) + tickEvent.schedule(curTick + cycles(delay)); + } + + /** Unschedule tick event, regardless of its current state. */ + void unscheduleTickEvent() + { + if (tickEvent.scheduled()) + tickEvent.squash(); + } + + class ActivateThreadEvent : public Event + { + private: + /** Number of Thread to Activate */ + int tid; + + /** Pointer to the CPU. */ + FullO3CPU<Impl> *cpu; + + public: + /** Constructs the event. */ + ActivateThreadEvent(); + + /** Initialize Event */ + void init(int thread_num, FullO3CPU<Impl> *thread_cpu); + + /** Processes the event, calling activateThread() on the CPU. */ + void process(); + + /** Returns the description of the event. */ + const char *description(); + }; + + /** Schedule thread to activate , regardless of its current state. */ + void scheduleActivateThreadEvent(int tid, int delay) + { + // Schedule thread to activate, regardless of its current state. + if (activateThreadEvent[tid].squashed()) + activateThreadEvent[tid].reschedule(curTick + cycles(delay)); + else if (!activateThreadEvent[tid].scheduled()) + activateThreadEvent[tid].schedule(curTick + cycles(delay)); + } + + /** Unschedule actiavte thread event, regardless of its current state. */ + void unscheduleActivateThreadEvent(int tid) + { + if (activateThreadEvent[tid].scheduled()) + activateThreadEvent[tid].squash(); + } + + /** The tick event used for scheduling CPU ticks. */ + ActivateThreadEvent activateThreadEvent[Impl::MaxThreads]; + + class DeallocateContextEvent : public Event + { + private: + /** Number of Thread to Activate */ + int tid; + + /** Pointer to the CPU. */ + FullO3CPU<Impl> *cpu; + + public: + /** Constructs the event. */ + DeallocateContextEvent(); + + /** Initialize Event */ + void init(int thread_num, FullO3CPU<Impl> *thread_cpu); + + /** Processes the event, calling activateThread() on the CPU. */ + void process(); + + /** Returns the description of the event. */ + const char *description(); + }; + + /** Schedule cpu to deallocate thread context.*/ + void scheduleDeallocateContextEvent(int tid, int delay) + { + // Schedule thread to activate, regardless of its current state. + if (deallocateContextEvent[tid].squashed()) + deallocateContextEvent[tid].reschedule(curTick + cycles(delay)); + else if (!deallocateContextEvent[tid].scheduled()) + deallocateContextEvent[tid].schedule(curTick + cycles(delay)); + } + + /** Unschedule thread deallocation in CPU */ + void unscheduleDeallocateContextEvent(int tid) + { + if (deallocateContextEvent[tid].scheduled()) + deallocateContextEvent[tid].squash(); + } + + /** The tick event used for scheduling CPU ticks. */ + DeallocateContextEvent deallocateContextEvent[Impl::MaxThreads]; + + public: + /** Constructs a CPU with the given parameters. */ + FullO3CPU(Params *params); + /** Destructor. */ + ~FullO3CPU(); + + /** Registers statistics. */ + void fullCPURegStats(); + + /** Returns a specific port. */ + Port *getPort(const std::string &if_name, int idx); + + /** Ticks CPU, calling tick() on each stage, and checking the overall + * activity to see if the CPU should deschedule itself. + */ + void tick(); + + /** Initialize the CPU */ + void init(); + + /** Returns the Number of Active Threads in the CPU */ + int numActiveThreads() + { return activeThreads.size(); } + + /** Add Thread to Active Threads List */ + void activateThread(unsigned tid); + + /** Remove Thread from Active Threads List */ + void deactivateThread(unsigned tid); + + /** Setup CPU to insert a thread's context */ + void insertThread(unsigned tid); + + /** Remove all of a thread's context from CPU */ + void removeThread(unsigned tid); + + /** Count the Total Instructions Committed in the CPU. */ + virtual Counter totalInstructions() const + { + Counter total(0); + + for (int i=0; i < thread.size(); i++) + total += thread[i]->numInst; + + return total; + } + + /** Add Thread to Active Threads List. */ + void activateContext(int tid, int delay); + + /** Remove Thread from Active Threads List */ + void suspendContext(int tid); + + /** Remove Thread from Active Threads List && + * Remove Thread Context from CPU. + */ + void deallocateContext(int tid, int delay = 1); + + /** Remove Thread from Active Threads List && + * Remove Thread Context from CPU. + */ + void haltContext(int tid); + + /** Activate a Thread When CPU Resources are Available. */ + void activateWhenReady(int tid); + + /** Add or Remove a Thread Context in the CPU. */ + void doContextSwitch(); + + /** Update The Order In Which We Process Threads. */ + void updateThreadPriority(); + + /** Serialize state. */ + virtual void serialize(std::ostream &os); + + /** Unserialize from a checkpoint. */ + virtual void unserialize(Checkpoint *cp, const std::string §ion); + + public: + /** Executes a syscall on this cycle. + * --------------------------------------- + * Note: this is a virtual function. CPU-Specific + * functionality defined in derived classes + */ + virtual void syscall(int tid) { panic("Unimplemented!"); } + + /** Starts draining the CPU's pipeline of all instructions in + * order to stop all memory accesses. */ + virtual unsigned int drain(Event *drain_event); + + /** Resumes execution after a drain. */ + virtual void resume(); + + /** Signals to this CPU that a stage has completed switching out. */ + void signalDrained(); + + /** Switches out this CPU. */ + virtual void switchOut(); + + /** Takes over from another CPU. */ + virtual void takeOverFrom(BaseCPU *oldCPU); + + /** Get the current instruction sequence number, and increment it. */ + InstSeqNum getAndIncrementInstSeq() + { return globalSeqNum++; } + +#if FULL_SYSTEM + /** Check if this address is a valid instruction address. */ + bool validInstAddr(Addr addr) { return true; } + + /** Check if this address is a valid data address. */ + bool validDataAddr(Addr addr) { return true; } + + /** Get instruction asid. */ + int getInstAsid(unsigned tid) + { return regFile.miscRegs[tid].getInstAsid(); } + + /** Get data asid. */ + int getDataAsid(unsigned tid) + { return regFile.miscRegs[tid].getDataAsid(); } +#else + /** Get instruction asid. */ + int getInstAsid(unsigned tid) + { return thread[tid]->getInstAsid(); } + + /** Get data asid. */ + int getDataAsid(unsigned tid) + { return thread[tid]->getDataAsid(); } + +#endif + + /** Register accessors. Index refers to the physical register index. */ + uint64_t readIntReg(int reg_idx); + + FloatReg readFloatReg(int reg_idx); + + FloatReg readFloatReg(int reg_idx, int width); + + FloatRegBits readFloatRegBits(int reg_idx); + + FloatRegBits readFloatRegBits(int reg_idx, int width); + + void setIntReg(int reg_idx, uint64_t val); + + void setFloatReg(int reg_idx, FloatReg val); + + void setFloatReg(int reg_idx, FloatReg val, int width); + + void setFloatRegBits(int reg_idx, FloatRegBits val); + + void setFloatRegBits(int reg_idx, FloatRegBits val, int width); + + uint64_t readArchIntReg(int reg_idx, unsigned tid); + + float readArchFloatRegSingle(int reg_idx, unsigned tid); + + double readArchFloatRegDouble(int reg_idx, unsigned tid); + + uint64_t readArchFloatRegInt(int reg_idx, unsigned tid); + + /** Architectural register accessors. Looks up in the commit + * rename table to obtain the true physical index of the + * architected register first, then accesses that physical + * register. + */ + void setArchIntReg(int reg_idx, uint64_t val, unsigned tid); + + void setArchFloatRegSingle(int reg_idx, float val, unsigned tid); + + void setArchFloatRegDouble(int reg_idx, double val, unsigned tid); + + void setArchFloatRegInt(int reg_idx, uint64_t val, unsigned tid); + + /** Reads the commit PC of a specific thread. */ + uint64_t readPC(unsigned tid); + + /** Sets the commit PC of a specific thread. */ + void setPC(Addr new_PC, unsigned tid); + + /** Reads the next PC of a specific thread. */ + uint64_t readNextPC(unsigned tid); + + /** Sets the next PC of a specific thread. */ + void setNextPC(uint64_t val, unsigned tid); + + /** Reads the next NPC of a specific thread. */ + uint64_t readNextNPC(unsigned tid); + + /** Sets the next NPC of a specific thread. */ + void setNextNPC(uint64_t val, unsigned tid); + + /** Function to add instruction onto the head of the list of the + * instructions. Used when new instructions are fetched. + */ + ListIt addInst(DynInstPtr &inst); + + /** Function to tell the CPU that an instruction has completed. */ + void instDone(unsigned tid); + + /** Add Instructions to the CPU Remove List*/ + void addToRemoveList(DynInstPtr &inst); + + /** Remove an instruction from the front end of the list. There's + * no restriction on location of the instruction. + */ + void removeFrontInst(DynInstPtr &inst); + + /** Remove all instructions that are not currently in the ROB. + * There's also an option to not squash delay slot instructions.*/ + void removeInstsNotInROB(unsigned tid, bool squash_delay_slot, + const InstSeqNum &delay_slot_seq_num); + + /** Remove all instructions younger than the given sequence number. */ + void removeInstsUntil(const InstSeqNum &seq_num,unsigned tid); + + /** Removes the instruction pointed to by the iterator. */ + inline void squashInstIt(const ListIt &instIt, const unsigned &tid); + + /** Cleans up all instructions on the remove list. */ + void cleanUpRemovedInsts(); + + /** Debug function to print all instructions on the list. */ + void dumpInsts(); + + public: + /** List of all the instructions in flight. */ + std::list<DynInstPtr> instList; + + /** List of all the instructions that will be removed at the end of this + * cycle. + */ + std::queue<ListIt> removeList; + +#ifdef DEBUG + /** Debug structure to keep track of the sequence numbers still in + * flight. + */ + std::set<InstSeqNum> snList; +#endif + + /** Records if instructions need to be removed this cycle due to + * being retired or squashed. + */ + bool removeInstsThisCycle; + + protected: + /** The fetch stage. */ + typename CPUPolicy::Fetch fetch; + + /** The decode stage. */ + typename CPUPolicy::Decode decode; + + /** The dispatch stage. */ + typename CPUPolicy::Rename rename; + + /** The issue/execute/writeback stages. */ + typename CPUPolicy::IEW iew; + + /** The commit stage. */ + typename CPUPolicy::Commit commit; + + /** The register file. */ + typename CPUPolicy::RegFile regFile; + + /** The free list. */ + typename CPUPolicy::FreeList freeList; + + /** The rename map. */ + typename CPUPolicy::RenameMap renameMap[Impl::MaxThreads]; + + /** The commit rename map. */ + typename CPUPolicy::RenameMap commitRenameMap[Impl::MaxThreads]; + + /** The re-order buffer. */ + typename CPUPolicy::ROB rob; + + /** Active Threads List */ + std::list<unsigned> activeThreads; + + /** Integer Register Scoreboard */ + Scoreboard scoreboard; + + public: + /** Enum to give each stage a specific index, so when calling + * activateStage() or deactivateStage(), they can specify which stage + * is being activated/deactivated. + */ + enum StageIdx { + FetchIdx, + DecodeIdx, + RenameIdx, + IEWIdx, + CommitIdx, + NumStages }; + + /** Typedefs from the Impl to get the structs that each of the + * time buffers should use. + */ + typedef typename CPUPolicy::TimeStruct TimeStruct; + + typedef typename CPUPolicy::FetchStruct FetchStruct; + + typedef typename CPUPolicy::DecodeStruct DecodeStruct; + + typedef typename CPUPolicy::RenameStruct RenameStruct; + + typedef typename CPUPolicy::IEWStruct IEWStruct; + + /** The main time buffer to do backwards communication. */ + TimeBuffer<TimeStruct> timeBuffer; + + /** The fetch stage's instruction queue. */ + TimeBuffer<FetchStruct> fetchQueue; + + /** The decode stage's instruction queue. */ + TimeBuffer<DecodeStruct> decodeQueue; + + /** The rename stage's instruction queue. */ + TimeBuffer<RenameStruct> renameQueue; + + /** The IEW stage's instruction queue. */ + TimeBuffer<IEWStruct> iewQueue; + + private: + /** The activity recorder; used to tell if the CPU has any + * activity remaining or if it can go to idle and deschedule + * itself. + */ + ActivityRecorder activityRec; + + public: + /** Records that there was time buffer activity this cycle. */ + void activityThisCycle() { activityRec.activity(); } + + /** Changes a stage's status to active within the activity recorder. */ + void activateStage(const StageIdx idx) + { activityRec.activateStage(idx); } + + /** Changes a stage's status to inactive within the activity recorder. */ + void deactivateStage(const StageIdx idx) + { activityRec.deactivateStage(idx); } + + /** Wakes the CPU, rescheduling the CPU if it's not already active. */ + void wakeCPU(); + + /** Gets a free thread id. Use if thread ids change across system. */ + int getFreeTid(); + + public: + /** Returns a pointer to a thread context. */ + ThreadContext *tcBase(unsigned tid) + { + return thread[tid]->getTC(); + } + + /** The global sequence number counter. */ + InstSeqNum globalSeqNum;//[Impl::MaxThreads]; + + /** Pointer to the checker, which can dynamically verify + * instruction results at run time. This can be set to NULL if it + * is not being used. + */ + Checker<DynInstPtr> *checker; + +#if FULL_SYSTEM + /** Pointer to the system. */ + System *system; + + /** Pointer to physical memory. */ + PhysicalMemory *physmem; +#endif + + /** Pointer to memory. */ + MemObject *mem; + + /** Event to call process() on once draining has completed. */ + Event *drainEvent; + + /** Counter of how many stages have completed draining. */ + int drainCount; + + /** Pointers to all of the threads in the CPU. */ + std::vector<Thread *> thread; + + /** Pointer to the icache interface. */ + MemInterface *icacheInterface; + /** Pointer to the dcache interface. */ + MemInterface *dcacheInterface; + + /** Whether or not the CPU should defer its registration. */ + bool deferRegistration; + + /** Is there a context switch pending? */ + bool contextSwitch; + + /** Threads Scheduled to Enter CPU */ + std::list<int> cpuWaitList; + + /** The cycle that the CPU was last running, used for statistics. */ + Tick lastRunningCycle; + + /** The cycle that the CPU was last activated by a new thread*/ + Tick lastActivatedCycle; + + /** Number of Threads CPU can process */ + unsigned numThreads; + + /** Mapping for system thread id to cpu id */ + std::map<unsigned,unsigned> threadMap; + + /** Available thread ids in the cpu*/ + std::vector<unsigned> tids; + + /** Stat for total number of times the CPU is descheduled. */ + Stats::Scalar<> timesIdled; + /** Stat for total number of cycles the CPU spends descheduled. */ + Stats::Scalar<> idleCycles; + /** Stat for the number of committed instructions per thread. */ + Stats::Vector<> committedInsts; + /** Stat for the total number of committed instructions. */ + Stats::Scalar<> totalCommittedInsts; + /** Stat for the CPI per thread. */ + Stats::Formula cpi; + /** Stat for the total CPI. */ + Stats::Formula totalCpi; + /** Stat for the IPC per thread. */ + Stats::Formula ipc; + /** Stat for the total IPC. */ + Stats::Formula totalIpc; +}; + +#endif // __CPU_O3_CPU_HH__ diff --git a/src/cpu/o3/cpu_policy.hh b/src/cpu/o3/cpu_policy.hh new file mode 100644 index 000000000..32a0adcf1 --- /dev/null +++ b/src/cpu/o3/cpu_policy.hh @@ -0,0 +1,119 @@ +/* + * Copyright (c) 2004-2005 The Regents of The University of Michigan + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are + * met: redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer; + * redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution; + * neither the name of the copyright holders nor the names of its + * contributors may be used to endorse or promote products derived from + * this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + * Authors: Kevin Lim + */ + +#ifndef __CPU_O3_CPU_POLICY_HH__ +#define __CPU_O3_CPU_POLICY_HH__ + +#include "cpu/o3/bpred_unit.hh" +#include "cpu/o3/free_list.hh" +#include "cpu/o3/inst_queue.hh" +#include "cpu/o3/lsq.hh" +#include "cpu/o3/lsq_unit.hh" +#include "cpu/o3/mem_dep_unit.hh" +#include "cpu/o3/regfile.hh" +#include "cpu/o3/rename_map.hh" +#include "cpu/o3/rob.hh" +#include "cpu/o3/store_set.hh" + +#include "cpu/o3/commit.hh" +#include "cpu/o3/decode.hh" +#include "cpu/o3/fetch.hh" +#include "cpu/o3/iew.hh" +#include "cpu/o3/rename.hh" + +#include "cpu/o3/comm.hh" + +/** + * Struct that defines the key classes to be used by the CPU. All + * classes use the typedefs defined here to determine what are the + * classes of the other stages and communication buffers. In order to + * change a structure such as the IQ, simply change the typedef here + * to use the desired class instead, and recompile. In order to + * create a different CPU to be used simultaneously with this one, see + * the alpha_impl.hh file for instructions. + */ +template<class Impl> +struct SimpleCPUPolicy +{ + /** Typedef for the branch prediction unit (which includes the BP, + * RAS, and BTB). + */ + typedef BPredUnit<Impl> BPredUnit; + /** Typedef for the register file. Most classes assume a unified + * physical register file. + */ + typedef PhysRegFile<Impl> RegFile; + /** Typedef for the freelist of registers. */ + typedef SimpleFreeList FreeList; + /** Typedef for the rename map. */ + typedef SimpleRenameMap RenameMap; + /** Typedef for the ROB. */ + typedef ROB<Impl> ROB; + /** Typedef for the instruction queue/scheduler. */ + typedef InstructionQueue<Impl> IQ; + /** Typedef for the memory dependence unit. */ + typedef MemDepUnit<StoreSet, Impl> MemDepUnit; + /** Typedef for the LSQ. */ + typedef LSQ<Impl> LSQ; + /** Typedef for the thread-specific LSQ units. */ + typedef LSQUnit<Impl> LSQUnit; + + /** Typedef for fetch. */ + typedef DefaultFetch<Impl> Fetch; + /** Typedef for decode. */ + typedef DefaultDecode<Impl> Decode; + /** Typedef for rename. */ + typedef DefaultRename<Impl> Rename; + /** Typedef for Issue/Execute/Writeback. */ + typedef DefaultIEW<Impl> IEW; + /** Typedef for commit. */ + typedef DefaultCommit<Impl> Commit; + + /** The struct for communication between fetch and decode. */ + typedef DefaultFetchDefaultDecode<Impl> FetchStruct; + + /** The struct for communication between decode and rename. */ + typedef DefaultDecodeDefaultRename<Impl> DecodeStruct; + + /** The struct for communication between rename and IEW. */ + typedef DefaultRenameDefaultIEW<Impl> RenameStruct; + + /** The struct for communication between IEW and commit. */ + typedef DefaultIEWDefaultCommit<Impl> IEWStruct; + + /** The struct for communication within the IEW stage. */ + typedef IssueStruct<Impl> IssueStruct; + + /** The struct for all backwards communication. */ + typedef TimeBufStruct<Impl> TimeStruct; + +}; + +#endif //__CPU_O3_CPU_POLICY_HH__ diff --git a/src/cpu/o3/decode.cc b/src/cpu/o3/decode.cc new file mode 100644 index 000000000..896e38331 --- /dev/null +++ b/src/cpu/o3/decode.cc @@ -0,0 +1,34 @@ +/* + * Copyright (c) 2004-2005 The Regents of The University of Michigan + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are + * met: redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer; + * redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution; + * neither the name of the copyright holders nor the names of its + * contributors may be used to endorse or promote products derived from + * this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + * Authors: Kevin Lim + */ + +#include "cpu/o3/isa_specific.hh" +#include "cpu/o3/decode_impl.hh" + +template class DefaultDecode<O3CPUImpl>; diff --git a/src/cpu/o3/decode.hh b/src/cpu/o3/decode.hh new file mode 100644 index 000000000..4a845e670 --- /dev/null +++ b/src/cpu/o3/decode.hh @@ -0,0 +1,316 @@ +/* + * Copyright (c) 2004-2006 The Regents of The University of Michigan + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are + * met: redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer; + * redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution; + * neither the name of the copyright holders nor the names of its + * contributors may be used to endorse or promote products derived from + * this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + * Authors: Kevin Lim + */ + +#ifndef __CPU_O3_DECODE_HH__ +#define __CPU_O3_DECODE_HH__ + +#include <queue> + +#include "base/statistics.hh" +#include "base/timebuf.hh" + +/** + * DefaultDecode class handles both single threaded and SMT + * decode. Its width is specified by the parameters; each cycles it + * tries to decode that many instructions. Because instructions are + * actually decoded when the StaticInst is created, this stage does + * not do much other than check any PC-relative branches. + */ +template<class Impl> +class DefaultDecode +{ + private: + // Typedefs from the Impl. + typedef typename Impl::O3CPU O3CPU; + typedef typename Impl::DynInstPtr DynInstPtr; + typedef typename Impl::Params Params; + typedef typename Impl::CPUPol CPUPol; + + // Typedefs from the CPU policy. + typedef typename CPUPol::FetchStruct FetchStruct; + typedef typename CPUPol::DecodeStruct DecodeStruct; + typedef typename CPUPol::TimeStruct TimeStruct; + + public: + /** Overall decode stage status. Used to determine if the CPU can + * deschedule itself due to a lack of activity. + */ + enum DecodeStatus { + Active, + Inactive + }; + + /** Individual thread status. */ + enum ThreadStatus { + Running, + Idle, + StartSquash, + Squashing, + Blocked, + Unblocking + }; + + private: + /** Decode status. */ + DecodeStatus _status; + + /** Per-thread status. */ + ThreadStatus decodeStatus[Impl::MaxThreads]; + + public: + /** DefaultDecode constructor. */ + DefaultDecode(Params *params); + + /** Returns the name of decode. */ + std::string name() const; + + /** Registers statistics. */ + void regStats(); + + /** Sets CPU pointer. */ + void setCPU(O3CPU *cpu_ptr); + + /** Sets the main backwards communication time buffer pointer. */ + void setTimeBuffer(TimeBuffer<TimeStruct> *tb_ptr); + + /** Sets pointer to time buffer used to communicate to the next stage. */ + void setDecodeQueue(TimeBuffer<DecodeStruct> *dq_ptr); + + /** Sets pointer to time buffer coming from fetch. */ + void setFetchQueue(TimeBuffer<FetchStruct> *fq_ptr); + + /** Sets pointer to list of active threads. */ + void setActiveThreads(std::list<unsigned> *at_ptr); + + /** Drains the decode stage. */ + bool drain(); + + /** Resumes execution after a drain. */ + void resume() { } + + /** Switches out the decode stage. */ + void switchOut() { } + + /** Takes over from another CPU's thread. */ + void takeOverFrom(); + + /** Ticks decode, processing all input signals and decoding as many + * instructions as possible. + */ + void tick(); + + /** Determines what to do based on decode's current status. + * @param status_change decode() sets this variable if there was a status + * change (ie switching from from blocking to unblocking). + * @param tid Thread id to decode instructions from. + */ + void decode(bool &status_change, unsigned tid); + + /** Processes instructions from fetch and passes them on to rename. + * Decoding of instructions actually happens when they are created in + * fetch, so this function mostly checks if PC-relative branches are + * correct. + */ + void decodeInsts(unsigned tid); + + private: + /** Inserts a thread's instructions into the skid buffer, to be decoded + * once decode unblocks. + */ + void skidInsert(unsigned tid); + + /** Returns if all of the skid buffers are empty. */ + bool skidsEmpty(); + + /** Updates overall decode status based on all of the threads' statuses. */ + void updateStatus(); + + /** Separates instructions from fetch into individual lists of instructions + * sorted by thread. + */ + void sortInsts(); + + /** Reads all stall signals from the backwards communication timebuffer. */ + void readStallSignals(unsigned tid); + + /** Checks all input signals and updates decode's status appropriately. */ + bool checkSignalsAndUpdate(unsigned tid); + + /** Checks all stall signals, and returns if any are true. */ + bool checkStall(unsigned tid) const; + + /** Returns if there any instructions from fetch on this cycle. */ + inline bool fetchInstsValid(); + + /** Switches decode to blocking, and signals back that decode has + * become blocked. + * @return Returns true if there is a status change. + */ + bool block(unsigned tid); + + /** Switches decode to unblocking if the skid buffer is empty, and + * signals back that decode has unblocked. + * @return Returns true if there is a status change. + */ + bool unblock(unsigned tid); + + /** Squashes if there is a PC-relative branch that was predicted + * incorrectly. Sends squash information back to fetch. + */ + void squash(DynInstPtr &inst, unsigned tid); + + public: + /** Squashes due to commit signalling a squash. Changes status to + * squashing and clears block/unblock signals as needed. + */ + unsigned squash(unsigned tid); + + private: + // Interfaces to objects outside of decode. + /** CPU interface. */ + O3CPU *cpu; + + /** Time buffer interface. */ + TimeBuffer<TimeStruct> *timeBuffer; + + /** Wire to get rename's output from backwards time buffer. */ + typename TimeBuffer<TimeStruct>::wire fromRename; + + /** Wire to get iew's information from backwards time buffer. */ + typename TimeBuffer<TimeStruct>::wire fromIEW; + + /** Wire to get commit's information from backwards time buffer. */ + typename TimeBuffer<TimeStruct>::wire fromCommit; + + /** Wire to write information heading to previous stages. */ + // Might not be the best name as not only fetch will read it. + typename TimeBuffer<TimeStruct>::wire toFetch; + + /** Decode instruction queue. */ + TimeBuffer<DecodeStruct> *decodeQueue; + + /** Wire used to write any information heading to rename. */ + typename TimeBuffer<DecodeStruct>::wire toRename; + + /** Fetch instruction queue interface. */ + TimeBuffer<FetchStruct> *fetchQueue; + + /** Wire to get fetch's output from fetch queue. */ + typename TimeBuffer<FetchStruct>::wire fromFetch; + + /** Queue of all instructions coming from fetch this cycle. */ + std::queue<DynInstPtr> insts[Impl::MaxThreads]; + + /** Skid buffer between fetch and decode. */ + std::queue<DynInstPtr> skidBuffer[Impl::MaxThreads]; + + /** Variable that tracks if decode has written to the time buffer this + * cycle. Used to tell CPU if there is activity this cycle. + */ + bool wroteToTimeBuffer; + + /** Source of possible stalls. */ + struct Stalls { + bool rename; + bool iew; + bool commit; + }; + + /** Tracks which stages are telling decode to stall. */ + Stalls stalls[Impl::MaxThreads]; + + /** Rename to decode delay, in ticks. */ + unsigned renameToDecodeDelay; + + /** IEW to decode delay, in ticks. */ + unsigned iewToDecodeDelay; + + /** Commit to decode delay, in ticks. */ + unsigned commitToDecodeDelay; + + /** Fetch to decode delay, in ticks. */ + unsigned fetchToDecodeDelay; + + /** The width of decode, in instructions. */ + unsigned decodeWidth; + + /** Index of instructions being sent to rename. */ + unsigned toRenameIndex; + + /** number of Active Threads*/ + unsigned numThreads; + + /** List of active thread ids */ + std::list<unsigned> *activeThreads; + + /** Number of branches in flight. */ + unsigned branchCount[Impl::MaxThreads]; + + /** Maximum size of the skid buffer. */ + unsigned skidBufferMax; + + /** SeqNum of Squashing Branch Delay Instruction (used for MIPS)*/ + Addr bdelayDoneSeqNum[Impl::MaxThreads]; + + /** Instruction used for squashing branch (used for MIPS)*/ + DynInstPtr squashInst[Impl::MaxThreads]; + + /** Tells when their is a pending delay slot inst. to send + * to rename. If there is, then wait squash after the next + * instruction (used for MIPS). + */ + bool squashAfterDelaySlot[Impl::MaxThreads]; + + + /** Stat for total number of idle cycles. */ + Stats::Scalar<> decodeIdleCycles; + /** Stat for total number of blocked cycles. */ + Stats::Scalar<> decodeBlockedCycles; + /** Stat for total number of normal running cycles. */ + Stats::Scalar<> decodeRunCycles; + /** Stat for total number of unblocking cycles. */ + Stats::Scalar<> decodeUnblockCycles; + /** Stat for total number of squashing cycles. */ + Stats::Scalar<> decodeSquashCycles; + /** Stat for number of times a branch is resolved at decode. */ + Stats::Scalar<> decodeBranchResolved; + /** Stat for number of times a branch mispredict is detected. */ + Stats::Scalar<> decodeBranchMispred; + /** Stat for number of times decode detected a non-control instruction + * incorrectly predicted as a branch. + */ + Stats::Scalar<> decodeControlMispred; + /** Stat for total number of decoded instructions. */ + Stats::Scalar<> decodeDecodedInsts; + /** Stat for total number of squashed instructions. */ + Stats::Scalar<> decodeSquashedInsts; +}; + +#endif // __CPU_O3_DECODE_HH__ diff --git a/src/cpu/o3/decode_impl.hh b/src/cpu/o3/decode_impl.hh new file mode 100644 index 000000000..80b6cc4c9 --- /dev/null +++ b/src/cpu/o3/decode_impl.hh @@ -0,0 +1,818 @@ +/* + * Copyright (c) 2004-2006 The Regents of The University of Michigan + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are + * met: redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer; + * redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution; + * neither the name of the copyright holders nor the names of its + * contributors may be used to endorse or promote products derived from + * this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + * Authors: Kevin Lim + */ + +#include "cpu/o3/decode.hh" + +template<class Impl> +DefaultDecode<Impl>::DefaultDecode(Params *params) + : renameToDecodeDelay(params->renameToDecodeDelay), + iewToDecodeDelay(params->iewToDecodeDelay), + commitToDecodeDelay(params->commitToDecodeDelay), + fetchToDecodeDelay(params->fetchToDecodeDelay), + decodeWidth(params->decodeWidth), + numThreads(params->numberOfThreads) +{ + _status = Inactive; + + // Setup status, make sure stall signals are clear. + for (int i = 0; i < numThreads; ++i) { + decodeStatus[i] = Idle; + + stalls[i].rename = false; + stalls[i].iew = false; + stalls[i].commit = false; + + squashAfterDelaySlot[i] = false; + } + + // @todo: Make into a parameter + skidBufferMax = (fetchToDecodeDelay * params->fetchWidth) + decodeWidth; +} + +template <class Impl> +std::string +DefaultDecode<Impl>::name() const +{ + return cpu->name() + ".decode"; +} + +template <class Impl> +void +DefaultDecode<Impl>::regStats() +{ + decodeIdleCycles + .name(name() + ".DECODE:IdleCycles") + .desc("Number of cycles decode is idle") + .prereq(decodeIdleCycles); + decodeBlockedCycles + .name(name() + ".DECODE:BlockedCycles") + .desc("Number of cycles decode is blocked") + .prereq(decodeBlockedCycles); + decodeRunCycles + .name(name() + ".DECODE:RunCycles") + .desc("Number of cycles decode is running") + .prereq(decodeRunCycles); + decodeUnblockCycles + .name(name() + ".DECODE:UnblockCycles") + .desc("Number of cycles decode is unblocking") + .prereq(decodeUnblockCycles); + decodeSquashCycles + .name(name() + ".DECODE:SquashCycles") + .desc("Number of cycles decode is squashing") + .prereq(decodeSquashCycles); + decodeBranchResolved + .name(name() + ".DECODE:BranchResolved") + .desc("Number of times decode resolved a branch") + .prereq(decodeBranchResolved); + decodeBranchMispred + .name(name() + ".DECODE:BranchMispred") + .desc("Number of times decode detected a branch misprediction") + .prereq(decodeBranchMispred); + decodeControlMispred + .name(name() + ".DECODE:ControlMispred") + .desc("Number of times decode detected an instruction incorrectly" + " predicted as a control") + .prereq(decodeControlMispred); + decodeDecodedInsts + .name(name() + ".DECODE:DecodedInsts") + .desc("Number of instructions handled by decode") + .prereq(decodeDecodedInsts); + decodeSquashedInsts + .name(name() + ".DECODE:SquashedInsts") + .desc("Number of squashed instructions handled by decode") + .prereq(decodeSquashedInsts); +} + +template<class Impl> +void +DefaultDecode<Impl>::setCPU(O3CPU *cpu_ptr) +{ + DPRINTF(Decode, "Setting CPU pointer.\n"); + cpu = cpu_ptr; +} + +template<class Impl> +void +DefaultDecode<Impl>::setTimeBuffer(TimeBuffer<TimeStruct> *tb_ptr) +{ + DPRINTF(Decode, "Setting time buffer pointer.\n"); + timeBuffer = tb_ptr; + + // Setup wire to write information back to fetch. + toFetch = timeBuffer->getWire(0); + + // Create wires to get information from proper places in time buffer. + fromRename = timeBuffer->getWire(-renameToDecodeDelay); + fromIEW = timeBuffer->getWire(-iewToDecodeDelay); + fromCommit = timeBuffer->getWire(-commitToDecodeDelay); +} + +template<class Impl> +void +DefaultDecode<Impl>::setDecodeQueue(TimeBuffer<DecodeStruct> *dq_ptr) +{ + DPRINTF(Decode, "Setting decode queue pointer.\n"); + decodeQueue = dq_ptr; + + // Setup wire to write information to proper place in decode queue. + toRename = decodeQueue->getWire(0); +} + +template<class Impl> +void +DefaultDecode<Impl>::setFetchQueue(TimeBuffer<FetchStruct> *fq_ptr) +{ + DPRINTF(Decode, "Setting fetch queue pointer.\n"); + fetchQueue = fq_ptr; + + // Setup wire to read information from fetch queue. + fromFetch = fetchQueue->getWire(-fetchToDecodeDelay); +} + +template<class Impl> +void +DefaultDecode<Impl>::setActiveThreads(std::list<unsigned> *at_ptr) +{ + DPRINTF(Decode, "Setting active threads list pointer.\n"); + activeThreads = at_ptr; +} + +template <class Impl> +bool +DefaultDecode<Impl>::drain() +{ + // Decode is done draining at any time. + cpu->signalDrained(); + return true; +} + +template <class Impl> +void +DefaultDecode<Impl>::takeOverFrom() +{ + _status = Inactive; + + // Be sure to reset state and clear out any old instructions. + for (int i = 0; i < numThreads; ++i) { + decodeStatus[i] = Idle; + + stalls[i].rename = false; + stalls[i].iew = false; + stalls[i].commit = false; + while (!insts[i].empty()) + insts[i].pop(); + while (!skidBuffer[i].empty()) + skidBuffer[i].pop(); + branchCount[i] = 0; + } + wroteToTimeBuffer = false; +} + +template<class Impl> +bool +DefaultDecode<Impl>::checkStall(unsigned tid) const +{ + bool ret_val = false; + + if (stalls[tid].rename) { + DPRINTF(Decode,"[tid:%i]: Stall fom Rename stage detected.\n", tid); + ret_val = true; + } else if (stalls[tid].iew) { + DPRINTF(Decode,"[tid:%i]: Stall fom IEW stage detected.\n", tid); + ret_val = true; + } else if (stalls[tid].commit) { + DPRINTF(Decode,"[tid:%i]: Stall fom Commit stage detected.\n", tid); + ret_val = true; + } + + return ret_val; +} + +template<class Impl> +inline bool +DefaultDecode<Impl>::fetchInstsValid() +{ + return fromFetch->size > 0; +} + +template<class Impl> +bool +DefaultDecode<Impl>::block(unsigned tid) +{ + DPRINTF(Decode, "[tid:%u]: Blocking.\n", tid); + + // Add the current inputs to the skid buffer so they can be + // reprocessed when this stage unblocks. + skidInsert(tid); + + // If the decode status is blocked or unblocking then decode has not yet + // signalled fetch to unblock. In that case, there is no need to tell + // fetch to block. + if (decodeStatus[tid] != Blocked) { + // Set the status to Blocked. + decodeStatus[tid] = Blocked; + + if (decodeStatus[tid] != Unblocking) { + toFetch->decodeBlock[tid] = true; + wroteToTimeBuffer = true; + } + + return true; + } + + return false; +} + +template<class Impl> +bool +DefaultDecode<Impl>::unblock(unsigned tid) +{ + // Decode is done unblocking only if the skid buffer is empty. + if (skidBuffer[tid].empty()) { + DPRINTF(Decode, "[tid:%u]: Done unblocking.\n", tid); + toFetch->decodeUnblock[tid] = true; + wroteToTimeBuffer = true; + + decodeStatus[tid] = Running; + return true; + } + + DPRINTF(Decode, "[tid:%u]: Currently unblocking.\n", tid); + + return false; +} + +template<class Impl> +void +DefaultDecode<Impl>::squash(DynInstPtr &inst, unsigned tid) +{ + DPRINTF(Decode, "[tid:%i]: Squashing due to incorrect branch prediction " + "detected at decode.\n", tid); + + // Send back mispredict information. + toFetch->decodeInfo[tid].branchMispredict = true; + toFetch->decodeInfo[tid].predIncorrect = true; + toFetch->decodeInfo[tid].doneSeqNum = inst->seqNum; + toFetch->decodeInfo[tid].squash = true; + toFetch->decodeInfo[tid].nextPC = inst->branchTarget(); +#if ISA_HAS_DELAY_SLOT + toFetch->decodeInfo[tid].branchTaken = inst->readNextNPC() != + (inst->readNextPC() + sizeof(TheISA::MachInst)); + + toFetch->decodeInfo[tid].bdelayDoneSeqNum = bdelayDoneSeqNum[tid]; + squashAfterDelaySlot[tid] = false; + + InstSeqNum squash_seq_num = bdelayDoneSeqNum[tid]; +#else + toFetch->decodeInfo[tid].branchTaken = + inst->readNextPC() != (inst->readPC() + sizeof(TheISA::MachInst)); + + InstSeqNum squash_seq_num = inst->seqNum; +#endif + + // Might have to tell fetch to unblock. + if (decodeStatus[tid] == Blocked || + decodeStatus[tid] == Unblocking) { + toFetch->decodeUnblock[tid] = 1; + } + + // Set status to squashing. + decodeStatus[tid] = Squashing; + + for (int i=0; i<fromFetch->size; i++) { + if (fromFetch->insts[i]->threadNumber == tid && + fromFetch->insts[i]->seqNum > squash_seq_num) { + fromFetch->insts[i]->setSquashed(); + } + } + + // Clear the instruction list and skid buffer in case they have any + // insts in them. + while (!insts[tid].empty()) { + +#if ISA_HAS_DELAY_SLOT + if (insts[tid].front()->seqNum <= squash_seq_num) { + DPRINTF(Decode, "[tid:%i]: Cannot remove incoming decode " + "instructions before delay slot [sn:%i]. %i insts" + "left in decode.\n", tid, squash_seq_num, + insts[tid].size()); + break; + } +#endif + insts[tid].pop(); + } + + while (!skidBuffer[tid].empty()) { + +#if ISA_HAS_DELAY_SLOT + if (skidBuffer[tid].front()->seqNum <= squash_seq_num) { + DPRINTF(Decode, "[tid:%i]: Cannot remove skidBuffer " + "instructions before delay slot [sn:%i]. %i insts" + "left in decode.\n", tid, squash_seq_num, + insts[tid].size()); + break; + } +#endif + skidBuffer[tid].pop(); + } + + // Squash instructions up until this one + cpu->removeInstsUntil(squash_seq_num, tid); +} + +template<class Impl> +unsigned +DefaultDecode<Impl>::squash(unsigned tid) +{ + DPRINTF(Decode, "[tid:%i]: Squashing.\n",tid); + + if (decodeStatus[tid] == Blocked || + decodeStatus[tid] == Unblocking) { +#if !FULL_SYSTEM + // In syscall emulation, we can have both a block and a squash due + // to a syscall in the same cycle. This would cause both signals to + // be high. This shouldn't happen in full system. + // @todo: Determine if this still happens. + if (toFetch->decodeBlock[tid]) { + toFetch->decodeBlock[tid] = 0; + } else { + toFetch->decodeUnblock[tid] = 1; + } +#else + toFetch->decodeUnblock[tid] = 1; +#endif + } + + // Set status to squashing. + decodeStatus[tid] = Squashing; + + // Go through incoming instructions from fetch and squash them. + unsigned squash_count = 0; + + for (int i=0; i<fromFetch->size; i++) { + if (fromFetch->insts[i]->threadNumber == tid) { + fromFetch->insts[i]->setSquashed(); + squash_count++; + } + } + + // Clear the instruction list and skid buffer in case they have any + // insts in them. + while (!insts[tid].empty()) { + insts[tid].pop(); + } + + while (!skidBuffer[tid].empty()) { + skidBuffer[tid].pop(); + } + + return squash_count; +} + +template<class Impl> +void +DefaultDecode<Impl>::skidInsert(unsigned tid) +{ + DynInstPtr inst = NULL; + + while (!insts[tid].empty()) { + inst = insts[tid].front(); + + insts[tid].pop(); + + assert(tid == inst->threadNumber); + + DPRINTF(Decode,"Inserting [sn:%lli] PC:%#x into decode skidBuffer %i\n", + inst->seqNum, inst->readPC(), inst->threadNumber); + + skidBuffer[tid].push(inst); + } + + // @todo: Eventually need to enforce this by not letting a thread + // fetch past its skidbuffer + assert(skidBuffer[tid].size() <= skidBufferMax); +} + +template<class Impl> +bool +DefaultDecode<Impl>::skidsEmpty() +{ + std::list<unsigned>::iterator threads = (*activeThreads).begin(); + + while (threads != (*activeThreads).end()) { + if (!skidBuffer[*threads++].empty()) + return false; + } + + return true; +} + +template<class Impl> +void +DefaultDecode<Impl>::updateStatus() +{ + bool any_unblocking = false; + + std::list<unsigned>::iterator threads = (*activeThreads).begin(); + + threads = (*activeThreads).begin(); + + while (threads != (*activeThreads).end()) { + unsigned tid = *threads++; + + if (decodeStatus[tid] == Unblocking) { + any_unblocking = true; + break; + } + } + + // Decode will have activity if it's unblocking. + if (any_unblocking) { + if (_status == Inactive) { + _status = Active; + + DPRINTF(Activity, "Activating stage.\n"); + + cpu->activateStage(O3CPU::DecodeIdx); + } + } else { + // If it's not unblocking, then decode will not have any internal + // activity. Switch it to inactive. + if (_status == Active) { + _status = Inactive; + DPRINTF(Activity, "Deactivating stage.\n"); + + cpu->deactivateStage(O3CPU::DecodeIdx); + } + } +} + +template <class Impl> +void +DefaultDecode<Impl>::sortInsts() +{ + int insts_from_fetch = fromFetch->size; +#ifdef DEBUG + for (int i=0; i < numThreads; i++) + assert(insts[i].empty()); +#endif + for (int i = 0; i < insts_from_fetch; ++i) { + insts[fromFetch->insts[i]->threadNumber].push(fromFetch->insts[i]); + } +} + +template<class Impl> +void +DefaultDecode<Impl>::readStallSignals(unsigned tid) +{ + if (fromRename->renameBlock[tid]) { + stalls[tid].rename = true; + } + + if (fromRename->renameUnblock[tid]) { + assert(stalls[tid].rename); + stalls[tid].rename = false; + } + + if (fromIEW->iewBlock[tid]) { + stalls[tid].iew = true; + } + + if (fromIEW->iewUnblock[tid]) { + assert(stalls[tid].iew); + stalls[tid].iew = false; + } + + if (fromCommit->commitBlock[tid]) { + stalls[tid].commit = true; + } + + if (fromCommit->commitUnblock[tid]) { + assert(stalls[tid].commit); + stalls[tid].commit = false; + } +} + +template <class Impl> +bool +DefaultDecode<Impl>::checkSignalsAndUpdate(unsigned tid) +{ + // Check if there's a squash signal, squash if there is. + // Check stall signals, block if necessary. + // If status was blocked + // Check if stall conditions have passed + // if so then go to unblocking + // If status was Squashing + // check if squashing is not high. Switch to running this cycle. + + // Update the per thread stall statuses. + readStallSignals(tid); + + // Check squash signals from commit. + if (fromCommit->commitInfo[tid].squash) { + + DPRINTF(Decode, "[tid:%u]: Squashing instructions due to squash " + "from commit.\n", tid); + + squash(tid); + + return true; + } + + // Check ROB squash signals from commit. + if (fromCommit->commitInfo[tid].robSquashing) { + DPRINTF(Decode, "[tid:%u]: ROB is still squashing.\n", tid); + + // Continue to squash. + decodeStatus[tid] = Squashing; + + return true; + } + + if (checkStall(tid)) { + return block(tid); + } + + if (decodeStatus[tid] == Blocked) { + DPRINTF(Decode, "[tid:%u]: Done blocking, switching to unblocking.\n", + tid); + + decodeStatus[tid] = Unblocking; + + unblock(tid); + + return true; + } + + if (decodeStatus[tid] == Squashing) { + // Switch status to running if decode isn't being told to block or + // squash this cycle. + DPRINTF(Decode, "[tid:%u]: Done squashing, switching to running.\n", + tid); + + decodeStatus[tid] = Running; + + return false; + } + + // If we've reached this point, we have not gotten any signals that + // cause decode to change its status. Decode remains the same as before. + return false; +} + +template<class Impl> +void +DefaultDecode<Impl>::tick() +{ + wroteToTimeBuffer = false; + + bool status_change = false; + + toRenameIndex = 0; + + std::list<unsigned>::iterator threads = (*activeThreads).begin(); + + sortInsts(); + + //Check stall and squash signals. + while (threads != (*activeThreads).end()) { + unsigned tid = *threads++; + + DPRINTF(Decode,"Processing [tid:%i]\n",tid); + status_change = checkSignalsAndUpdate(tid) || status_change; + + decode(status_change, tid); + } + + if (status_change) { + updateStatus(); + } + + if (wroteToTimeBuffer) { + DPRINTF(Activity, "Activity this cycle.\n"); + + cpu->activityThisCycle(); + } +} + +template<class Impl> +void +DefaultDecode<Impl>::decode(bool &status_change, unsigned tid) +{ + // If status is Running or idle, + // call decodeInsts() + // If status is Unblocking, + // buffer any instructions coming from fetch + // continue trying to empty skid buffer + // check if stall conditions have passed + + if (decodeStatus[tid] == Blocked) { + ++decodeBlockedCycles; + } else if (decodeStatus[tid] == Squashing) { + ++decodeSquashCycles; + } + + // Decode should try to decode as many instructions as its bandwidth + // will allow, as long as it is not currently blocked. + if (decodeStatus[tid] == Running || + decodeStatus[tid] == Idle) { + DPRINTF(Decode, "[tid:%u]: Not blocked, so attempting to run " + "stage.\n",tid); + + decodeInsts(tid); + } else if (decodeStatus[tid] == Unblocking) { + // Make sure that the skid buffer has something in it if the + // status is unblocking. + assert(!skidsEmpty()); + + // If the status was unblocking, then instructions from the skid + // buffer were used. Remove those instructions and handle + // the rest of unblocking. + decodeInsts(tid); + + if (fetchInstsValid()) { + // Add the current inputs to the skid buffer so they can be + // reprocessed when this stage unblocks. + skidInsert(tid); + } + + status_change = unblock(tid) || status_change; + } +} + +template <class Impl> +void +DefaultDecode<Impl>::decodeInsts(unsigned tid) +{ + // Instructions can come either from the skid buffer or the list of + // instructions coming from fetch, depending on decode's status. + int insts_available = decodeStatus[tid] == Unblocking ? + skidBuffer[tid].size() : insts[tid].size(); + + if (insts_available == 0) { + DPRINTF(Decode, "[tid:%u] Nothing to do, breaking out" + " early.\n",tid); + // Should I change the status to idle? + ++decodeIdleCycles; + return; + } else if (decodeStatus[tid] == Unblocking) { + DPRINTF(Decode, "[tid:%u] Unblocking, removing insts from skid " + "buffer.\n",tid); + ++decodeUnblockCycles; + } else if (decodeStatus[tid] == Running) { + ++decodeRunCycles; + } + + DynInstPtr inst; + + std::queue<DynInstPtr> + &insts_to_decode = decodeStatus[tid] == Unblocking ? + skidBuffer[tid] : insts[tid]; + + DPRINTF(Decode, "[tid:%u]: Sending instruction to rename.\n",tid); + + while (insts_available > 0 && toRenameIndex < decodeWidth) { + assert(!insts_to_decode.empty()); + + inst = insts_to_decode.front(); + + insts_to_decode.pop(); + + DPRINTF(Decode, "[tid:%u]: Processing instruction [sn:%lli] with " + "PC %#x\n", + tid, inst->seqNum, inst->readPC()); + + if (inst->isSquashed()) { + DPRINTF(Decode, "[tid:%u]: Instruction %i with PC %#x is " + "squashed, skipping.\n", + tid, inst->seqNum, inst->readPC()); + + ++decodeSquashedInsts; + + --insts_available; + + continue; + } + + // Also check if instructions have no source registers. Mark + // them as ready to issue at any time. Not sure if this check + // should exist here or at a later stage; however it doesn't matter + // too much for function correctness. + if (inst->numSrcRegs() == 0) { + inst->setCanIssue(); + } + + // This current instruction is valid, so add it into the decode + // queue. The next instruction may not be valid, so check to + // see if branches were predicted correctly. + toRename->insts[toRenameIndex] = inst; + + ++(toRename->size); + ++toRenameIndex; + ++decodeDecodedInsts; + --insts_available; + + // Ensure that if it was predicted as a branch, it really is a + // branch. + if (inst->predTaken() && !inst->isControl()) { + DPRINTF(Decode, "PredPC : %#x != NextPC: %#x\n",inst->predPC, + inst->nextPC + 4); + + panic("Instruction predicted as a branch!"); + + ++decodeControlMispred; + + // Might want to set some sort of boolean and just do + // a check at the end + squash(inst, inst->threadNumber); + + break; + } + + // Go ahead and compute any PC-relative branches. + if (inst->isDirectCtrl() && inst->isUncondCtrl()) { + ++decodeBranchResolved; + + if (inst->branchTarget() != inst->readPredTarg()) { + ++decodeBranchMispred; + + // Might want to set some sort of boolean and just do + // a check at the end +#if !ISA_HAS_DELAY_SLOT + squash(inst, inst->threadNumber); + inst->setPredTarg(inst->branchTarget()); + break; +#else + // If mispredicted as taken, then ignore delay slot + // instruction... else keep delay slot and squash + // after it is sent to rename + if (inst->predTaken() && inst->isCondDelaySlot()) { + DPRINTF(Decode, "[tid:%i]: Conditional delay slot inst." + "[sn:%i] PC %#x mispredicted as taken.\n", tid, + inst->seqNum, inst->PC); + bdelayDoneSeqNum[tid] = inst->seqNum; + squash(inst, inst->threadNumber); + inst->setPredTarg(inst->branchTarget()); + break; + } else { + DPRINTF(Decode, "[tid:%i]: Misprediction detected at " + "[sn:%i] PC %#x, will squash after delay slot " + "inst. is sent to Rename\n", + tid, inst->seqNum, inst->PC); + bdelayDoneSeqNum[tid] = inst->seqNum + 1; + squashAfterDelaySlot[tid] = true; + squashInst[tid] = inst; + continue; + } +#endif + } + } + + if (squashAfterDelaySlot[tid]) { + assert(!inst->isSquashed()); + squash(squashInst[tid], squashInst[tid]->threadNumber); + squashInst[tid]->setPredTarg(squashInst[tid]->branchTarget()); + assert(!inst->isSquashed()); + break; + } + } + + // If we didn't process all instructions, then we will need to block + // and put all those instructions into the skid buffer. + if (!insts_to_decode.empty()) { + block(tid); + } + + // Record that decode has written to the time buffer for activity + // tracking. + if (toRenameIndex) { + wroteToTimeBuffer = true; + } +} diff --git a/src/cpu/o3/dep_graph.hh b/src/cpu/o3/dep_graph.hh new file mode 100644 index 000000000..c19fd0abf --- /dev/null +++ b/src/cpu/o3/dep_graph.hh @@ -0,0 +1,272 @@ +/* + * Copyright (c) 2006 The Regents of The University of Michigan + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are + * met: redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer; + * redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution; + * neither the name of the copyright holders nor the names of its + * contributors may be used to endorse or promote products derived from + * this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + * Authors: Kevin Lim + */ + +#ifndef __CPU_O3_DEP_GRAPH_HH__ +#define __CPU_O3_DEP_GRAPH_HH__ + +#include "cpu/o3/comm.hh" + +/** Node in a linked list. */ +template <class DynInstPtr> +class DependencyEntry +{ + public: + DependencyEntry() + : inst(NULL), next(NULL) + { } + + DynInstPtr inst; + //Might want to include data about what arch. register the + //dependence is waiting on. + DependencyEntry<DynInstPtr> *next; +}; + +/** Array of linked list that maintains the dependencies between + * producing instructions and consuming instructions. Each linked + * list represents a single physical register, having the future + * producer of the register's value, and all consumers waiting on that + * value on the list. The head node of each linked list represents + * the producing instruction of that register. Instructions are put + * on the list upon reaching the IQ, and are removed from the list + * either when the producer completes, or the instruction is squashed. +*/ +template <class DynInstPtr> +class DependencyGraph +{ + public: + typedef DependencyEntry<DynInstPtr> DepEntry; + + /** Default construction. Must call resize() prior to use. */ + DependencyGraph() + : numEntries(0), memAllocCounter(0), nodesTraversed(0), nodesRemoved(0) + { } + + ~DependencyGraph(); + + /** Resize the dependency graph to have num_entries registers. */ + void resize(int num_entries); + + /** Clears all of the linked lists. */ + void reset(); + + /** Inserts an instruction to be dependent on the given index. */ + void insert(PhysRegIndex idx, DynInstPtr &new_inst); + + /** Sets the producing instruction of a given register. */ + void setInst(PhysRegIndex idx, DynInstPtr &new_inst) + { dependGraph[idx].inst = new_inst; } + + /** Clears the producing instruction. */ + void clearInst(PhysRegIndex idx) + { dependGraph[idx].inst = NULL; } + + /** Removes an instruction from a single linked list. */ + void remove(PhysRegIndex idx, DynInstPtr &inst_to_remove); + + /** Removes and returns the newest dependent of a specific register. */ + DynInstPtr pop(PhysRegIndex idx); + + /** Checks if there are any dependents on a specific register. */ + bool empty(PhysRegIndex idx) { return !dependGraph[idx].next; } + + /** Debugging function to dump out the dependency graph. + */ + void dump(); + + private: + /** Array of linked lists. Each linked list is a list of all the + * instructions that depend upon a given register. The actual + * register's index is used to index into the graph; ie all + * instructions in flight that are dependent upon r34 will be + * in the linked list of dependGraph[34]. + */ + DepEntry *dependGraph; + + /** Number of linked lists; identical to the number of registers. */ + int numEntries; + + // Debug variable, remove when done testing. + unsigned memAllocCounter; + + public: + // Debug variable, remove when done testing. + uint64_t nodesTraversed; + // Debug variable, remove when done testing. + uint64_t nodesRemoved; +}; + +template <class DynInstPtr> +DependencyGraph<DynInstPtr>::~DependencyGraph() +{ + delete [] dependGraph; +} + +template <class DynInstPtr> +void +DependencyGraph<DynInstPtr>::resize(int num_entries) +{ + numEntries = num_entries; + dependGraph = new DepEntry[numEntries]; +} + +template <class DynInstPtr> +void +DependencyGraph<DynInstPtr>::reset() +{ + // Clear the dependency graph + DepEntry *curr; + DepEntry *prev; + + for (int i = 0; i < numEntries; ++i) { + curr = dependGraph[i].next; + + while (curr) { + memAllocCounter--; + + prev = curr; + curr = prev->next; + prev->inst = NULL; + + delete prev; + } + + if (dependGraph[i].inst) { + dependGraph[i].inst = NULL; + } + + dependGraph[i].next = NULL; + } +} + +template <class DynInstPtr> +void +DependencyGraph<DynInstPtr>::insert(PhysRegIndex idx, DynInstPtr &new_inst) +{ + //Add this new, dependent instruction at the head of the dependency + //chain. + + // First create the entry that will be added to the head of the + // dependency chain. + DepEntry *new_entry = new DepEntry; + new_entry->next = dependGraph[idx].next; + new_entry->inst = new_inst; + + // Then actually add it to the chain. + dependGraph[idx].next = new_entry; + + ++memAllocCounter; +} + + +template <class DynInstPtr> +void +DependencyGraph<DynInstPtr>::remove(PhysRegIndex idx, + DynInstPtr &inst_to_remove) +{ + DepEntry *prev = &dependGraph[idx]; + DepEntry *curr = dependGraph[idx].next; + + // Make sure curr isn't NULL. Because this instruction is being + // removed from a dependency list, it must have been placed there at + // an earlier time. The dependency chain should not be empty, + // unless the instruction dependent upon it is already ready. + if (curr == NULL) { + return; + } + + nodesRemoved++; + + // Find the instruction to remove within the dependency linked list. + while (curr->inst != inst_to_remove) { + prev = curr; + curr = curr->next; + nodesTraversed++; + + assert(curr != NULL); + } + + // Now remove this instruction from the list. + prev->next = curr->next; + + --memAllocCounter; + + // Could push this off to the destructor of DependencyEntry + curr->inst = NULL; + + delete curr; +} + +template <class DynInstPtr> +DynInstPtr +DependencyGraph<DynInstPtr>::pop(PhysRegIndex idx) +{ + DepEntry *node; + node = dependGraph[idx].next; + DynInstPtr inst = NULL; + if (node) { + inst = node->inst; + dependGraph[idx].next = node->next; + node->inst = NULL; + memAllocCounter--; + delete node; + } + return inst; +} + +template <class DynInstPtr> +void +DependencyGraph<DynInstPtr>::dump() +{ + DepEntry *curr; + + for (int i = 0; i < numEntries; ++i) + { + curr = &dependGraph[i]; + + if (curr->inst) { + cprintf("dependGraph[%i]: producer: %#x [sn:%lli] consumer: ", + i, curr->inst->readPC(), curr->inst->seqNum); + } else { + cprintf("dependGraph[%i]: No producer. consumer: ", i); + } + + while (curr->next != NULL) { + curr = curr->next; + + cprintf("%#x [sn:%lli] ", + curr->inst->readPC(), curr->inst->seqNum); + } + + cprintf("\n"); + } + cprintf("memAllocCounter: %i\n", memAllocCounter); +} + +#endif // __CPU_O3_DEP_GRAPH_HH__ diff --git a/src/cpu/o3/dyn_inst.hh b/src/cpu/o3/dyn_inst.hh new file mode 100644 index 000000000..279513493 --- /dev/null +++ b/src/cpu/o3/dyn_inst.hh @@ -0,0 +1,52 @@ +/* + * Copyright (c) 2006 The Regents of The University of Michigan + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are + * met: redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer; + * redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution; + * neither the name of the copyright holders nor the names of its + * contributors may be used to endorse or promote products derived from + * this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + * Authors: Korey Sewell + */ + +#ifndef __CPU_O3_DYN_INST_HH__ +#define __CPU_O3_DYN_INST_HH__ + +#include "arch/isa_specific.hh" + +#if THE_ISA == ALPHA_ISA + template <class Impl> class AlphaDynInst; + struct AlphaSimpleImpl; + typedef AlphaDynInst<AlphaSimpleImpl> O3DynInst; +#elif THE_ISA == MIPS_ISA + template <class Impl> class MipsDynInst; + struct MipsSimpleImpl; + typedef MipsDynInst<MipsSimpleImpl> O3DynInst; +#elif THE_ISA == SPARC_ISA + template <class Impl> class SparcDynInst; + struct SparcSimpleImpl; + typedef SparcDynInst<SparcSimpleImpl> O3DynInst; +#else + #error "O3DynInst not defined for this ISA" +#endif + +#endif // __CPU_O3_DYN_INST_HH__ diff --git a/src/cpu/o3/fetch.cc b/src/cpu/o3/fetch.cc new file mode 100644 index 000000000..d809b07e4 --- /dev/null +++ b/src/cpu/o3/fetch.cc @@ -0,0 +1,34 @@ +/* + * Copyright (c) 2004-2005 The Regents of The University of Michigan + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are + * met: redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer; + * redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution; + * neither the name of the copyright holders nor the names of its + * contributors may be used to endorse or promote products derived from + * this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + * Authors: Kevin Lim + */ + +#include "cpu/o3/isa_specific.hh" +#include "cpu/o3/fetch_impl.hh" + +template class DefaultFetch<O3CPUImpl>; diff --git a/src/cpu/o3/fetch.hh b/src/cpu/o3/fetch.hh new file mode 100644 index 000000000..1a2ca32a4 --- /dev/null +++ b/src/cpu/o3/fetch.hh @@ -0,0 +1,493 @@ +/* + * Copyright (c) 2004-2006 The Regents of The University of Michigan + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are + * met: redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer; + * redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution; + * neither the name of the copyright holders nor the names of its + * contributors may be used to endorse or promote products derived from + * this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + * Authors: Kevin Lim + * Korey Sewell + */ + +#ifndef __CPU_O3_FETCH_HH__ +#define __CPU_O3_FETCH_HH__ + +#include "arch/utility.hh" +#include "base/statistics.hh" +#include "base/timebuf.hh" +#include "cpu/pc_event.hh" +#include "mem/packet_impl.hh" +#include "mem/port.hh" +#include "sim/eventq.hh" + +/** + * DefaultFetch class handles both single threaded and SMT fetch. Its + * width is specified by the parameters; each cycle it tries to fetch + * that many instructions. It supports using a branch predictor to + * predict direction and targets. + * It supports the idling functionality of the CPU by indicating to + * the CPU when it is active and inactive. + */ +template <class Impl> +class DefaultFetch +{ + public: + /** Typedefs from Impl. */ + typedef typename Impl::CPUPol CPUPol; + typedef typename Impl::DynInst DynInst; + typedef typename Impl::DynInstPtr DynInstPtr; + typedef typename Impl::O3CPU O3CPU; + typedef typename Impl::Params Params; + + /** Typedefs from the CPU policy. */ + typedef typename CPUPol::BPredUnit BPredUnit; + typedef typename CPUPol::FetchStruct FetchStruct; + typedef typename CPUPol::TimeStruct TimeStruct; + + /** Typedefs from ISA. */ + typedef TheISA::MachInst MachInst; + typedef TheISA::ExtMachInst ExtMachInst; + + /** IcachePort class for DefaultFetch. Handles doing the + * communication with the cache/memory. + */ + class IcachePort : public Port + { + protected: + /** Pointer to fetch. */ + DefaultFetch<Impl> *fetch; + + public: + /** Default constructor. */ + IcachePort(DefaultFetch<Impl> *_fetch) + : Port(_fetch->name() + "-iport"), fetch(_fetch) + { } + + protected: + /** Atomic version of receive. Panics. */ + virtual Tick recvAtomic(PacketPtr pkt); + + /** Functional version of receive. Panics. */ + virtual void recvFunctional(PacketPtr pkt); + + /** Receives status change. Other than range changing, panics. */ + virtual void recvStatusChange(Status status); + + /** Returns the address ranges of this device. */ + virtual void getDeviceAddressRanges(AddrRangeList &resp, + AddrRangeList &snoop) + { resp.clear(); snoop.clear(); } + + /** Timing version of receive. Handles setting fetch to the + * proper status to start fetching. */ + virtual bool recvTiming(PacketPtr pkt); + + /** Handles doing a retry of a failed fetch. */ + virtual void recvRetry(); + }; + + + public: + /** Overall fetch status. Used to determine if the CPU can + * deschedule itsef due to a lack of activity. + */ + enum FetchStatus { + Active, + Inactive + }; + + /** Individual thread status. */ + enum ThreadStatus { + Running, + Idle, + Squashing, + Blocked, + Fetching, + TrapPending, + QuiescePending, + SwitchOut, + IcacheWaitResponse, + IcacheWaitRetry, + IcacheAccessComplete + }; + + /** Fetching Policy, Add new policies here.*/ + enum FetchPriority { + SingleThread, + RoundRobin, + Branch, + IQ, + LSQ + }; + + private: + /** Fetch status. */ + FetchStatus _status; + + /** Per-thread status. */ + ThreadStatus fetchStatus[Impl::MaxThreads]; + + /** Fetch policy. */ + FetchPriority fetchPolicy; + + /** List that has the threads organized by priority. */ + std::list<unsigned> priorityList; + + public: + /** DefaultFetch constructor. */ + DefaultFetch(Params *params); + + /** Returns the name of fetch. */ + std::string name() const; + + /** Registers statistics. */ + void regStats(); + + /** Returns the icache port. */ + Port *getIcachePort() { return icachePort; } + + /** Sets CPU pointer. */ + void setCPU(O3CPU *cpu_ptr); + + /** Sets the main backwards communication time buffer pointer. */ + void setTimeBuffer(TimeBuffer<TimeStruct> *time_buffer); + + /** Sets pointer to list of active threads. */ + void setActiveThreads(std::list<unsigned> *at_ptr); + + /** Sets pointer to time buffer used to communicate to the next stage. */ + void setFetchQueue(TimeBuffer<FetchStruct> *fq_ptr); + + /** Initialize stage. */ + void initStage(); + + /** Processes cache completion event. */ + void processCacheCompletion(PacketPtr pkt); + + /** Begins the drain of the fetch stage. */ + bool drain(); + + /** Resumes execution after a drain. */ + void resume(); + + /** Tells fetch stage to prepare to be switched out. */ + void switchOut(); + + /** Takes over from another CPU's thread. */ + void takeOverFrom(); + + /** Checks if the fetch stage is switched out. */ + bool isSwitchedOut() { return switchedOut; } + + /** Tells fetch to wake up from a quiesce instruction. */ + void wakeFromQuiesce(); + + private: + /** Changes the status of this stage to active, and indicates this + * to the CPU. + */ + inline void switchToActive(); + + /** Changes the status of this stage to inactive, and indicates + * this to the CPU. + */ + inline void switchToInactive(); + + /** + * Looks up in the branch predictor to see if the next PC should be + * either next PC+=MachInst or a branch target. + * @param next_PC Next PC variable passed in by reference. It is + * expected to be set to the current PC; it will be updated with what + * the next PC will be. + * @param next_NPC Used for ISAs which use delay slots. + * @return Whether or not a branch was predicted as taken. + */ + bool lookupAndUpdateNextPC(DynInstPtr &inst, Addr &next_PC, Addr &next_NPC); + + /** + * Fetches the cache line that contains fetch_PC. Returns any + * fault that happened. Puts the data into the class variable + * cacheData. + * @param fetch_PC The PC address that is being fetched from. + * @param ret_fault The fault reference that will be set to the result of + * the icache access. + * @param tid Thread id. + * @return Any fault that occured. + */ + bool fetchCacheLine(Addr fetch_PC, Fault &ret_fault, unsigned tid); + + /** Squashes a specific thread and resets the PC. */ + inline void doSquash(const Addr &new_PC, unsigned tid); + + /** Squashes a specific thread and resets the PC. Also tells the CPU to + * remove any instructions between fetch and decode that should be sqaushed. + */ + void squashFromDecode(const Addr &new_PC, const InstSeqNum &seq_num, + unsigned tid); + + /** Checks if a thread is stalled. */ + bool checkStall(unsigned tid) const; + + /** Updates overall fetch stage status; to be called at the end of each + * cycle. */ + FetchStatus updateFetchStatus(); + + public: + /** Squashes a specific thread and resets the PC. Also tells the CPU to + * remove any instructions that are not in the ROB. The source of this + * squash should be the commit stage. + */ + void squash(const Addr &new_PC, const InstSeqNum &seq_num, + bool squash_delay_slot, unsigned tid); + + /** Ticks the fetch stage, processing all inputs signals and fetching + * as many instructions as possible. + */ + void tick(); + + /** Checks all input signals and updates the status as necessary. + * @return: Returns if the status has changed due to input signals. + */ + bool checkSignalsAndUpdate(unsigned tid); + + /** Does the actual fetching of instructions and passing them on to the + * next stage. + * @param status_change fetch() sets this variable if there was a status + * change (ie switching to IcacheMissStall). + */ + void fetch(bool &status_change); + + /** Align a PC to the start of an I-cache block. */ + Addr icacheBlockAlignPC(Addr addr) + { + addr = TheISA::realPCToFetchPC(addr); + return (addr & ~(cacheBlkMask)); + } + + private: + /** Handles retrying the fetch access. */ + void recvRetry(); + + /** Returns the appropriate thread to fetch, given the fetch policy. */ + int getFetchingThread(FetchPriority &fetch_priority); + + /** Returns the appropriate thread to fetch using a round robin policy. */ + int roundRobin(); + + /** Returns the appropriate thread to fetch using the IQ count policy. */ + int iqCount(); + + /** Returns the appropriate thread to fetch using the LSQ count policy. */ + int lsqCount(); + + /** Returns the appropriate thread to fetch using the branch count policy. */ + int branchCount(); + + private: + /** Pointer to the O3CPU. */ + O3CPU *cpu; + + /** Time buffer interface. */ + TimeBuffer<TimeStruct> *timeBuffer; + + /** Wire to get decode's information from backwards time buffer. */ + typename TimeBuffer<TimeStruct>::wire fromDecode; + + /** Wire to get rename's information from backwards time buffer. */ + typename TimeBuffer<TimeStruct>::wire fromRename; + + /** Wire to get iew's information from backwards time buffer. */ + typename TimeBuffer<TimeStruct>::wire fromIEW; + + /** Wire to get commit's information from backwards time buffer. */ + typename TimeBuffer<TimeStruct>::wire fromCommit; + + /** Internal fetch instruction queue. */ + TimeBuffer<FetchStruct> *fetchQueue; + + //Might be annoying how this name is different than the queue. + /** Wire used to write any information heading to decode. */ + typename TimeBuffer<FetchStruct>::wire toDecode; + + MemObject *mem; + + /** Icache interface. */ + IcachePort *icachePort; + + /** BPredUnit. */ + BPredUnit branchPred; + + /** Per-thread fetch PC. */ + Addr PC[Impl::MaxThreads]; + + /** Per-thread next PC. */ + Addr nextPC[Impl::MaxThreads]; + + /** Per-thread next Next PC. + * This is not a real register but is used for + * architectures that use a branch-delay slot. + * (such as MIPS or Sparc) + */ + Addr nextNPC[Impl::MaxThreads]; + + /** Memory request used to access cache. */ + RequestPtr memReq[Impl::MaxThreads]; + + /** Variable that tracks if fetch has written to the time buffer this + * cycle. Used to tell CPU if there is activity this cycle. + */ + bool wroteToTimeBuffer; + + /** Tracks how many instructions has been fetched this cycle. */ + int numInst; + + /** Tracks delay slot information for threads in ISAs which use + * delay slots; + */ + struct DelaySlotInfo { + InstSeqNum delaySlotSeqNum; + InstSeqNum branchSeqNum; + int numInsts; + Addr targetAddr; + bool targetReady; + }; + + DelaySlotInfo delaySlotInfo[Impl::MaxThreads]; + + /** Source of possible stalls. */ + struct Stalls { + bool decode; + bool rename; + bool iew; + bool commit; + }; + + /** Tracks which stages are telling fetch to stall. */ + Stalls stalls[Impl::MaxThreads]; + + /** Decode to fetch delay, in ticks. */ + unsigned decodeToFetchDelay; + + /** Rename to fetch delay, in ticks. */ + unsigned renameToFetchDelay; + + /** IEW to fetch delay, in ticks. */ + unsigned iewToFetchDelay; + + /** Commit to fetch delay, in ticks. */ + unsigned commitToFetchDelay; + + /** The width of fetch in instructions. */ + unsigned fetchWidth; + + /** Is the cache blocked? If so no threads can access it. */ + bool cacheBlocked; + + /** The packet that is waiting to be retried. */ + PacketPtr retryPkt; + + /** The thread that is waiting on the cache to tell fetch to retry. */ + int retryTid; + + /** Cache block size. */ + int cacheBlkSize; + + /** Mask to get a cache block's address. */ + Addr cacheBlkMask; + + /** The cache line being fetched. */ + uint8_t *cacheData[Impl::MaxThreads]; + + /** The PC of the cacheline that has been loaded. */ + Addr cacheDataPC[Impl::MaxThreads]; + + /** Whether or not the cache data is valid. */ + bool cacheDataValid[Impl::MaxThreads]; + + /** Size of instructions. */ + int instSize; + + /** Icache stall statistics. */ + Counter lastIcacheStall[Impl::MaxThreads]; + + /** List of Active Threads */ + std::list<unsigned> *activeThreads; + + /** Number of threads. */ + unsigned numThreads; + + /** Number of threads that are actively fetching. */ + unsigned numFetchingThreads; + + /** Thread ID being fetched. */ + int threadFetched; + + /** Checks if there is an interrupt pending. If there is, fetch + * must stop once it is not fetching PAL instructions. + */ + bool interruptPending; + + /** Is there a drain pending. */ + bool drainPending; + + /** Records if fetch is switched out. */ + bool switchedOut; + + // @todo: Consider making these vectors and tracking on a per thread basis. + /** Stat for total number of cycles stalled due to an icache miss. */ + Stats::Scalar<> icacheStallCycles; + /** Stat for total number of fetched instructions. */ + Stats::Scalar<> fetchedInsts; + /** Total number of fetched branches. */ + Stats::Scalar<> fetchedBranches; + /** Stat for total number of predicted branches. */ + Stats::Scalar<> predictedBranches; + /** Stat for total number of cycles spent fetching. */ + Stats::Scalar<> fetchCycles; + /** Stat for total number of cycles spent squashing. */ + Stats::Scalar<> fetchSquashCycles; + /** Stat for total number of cycles spent blocked due to other stages in + * the pipeline. + */ + Stats::Scalar<> fetchIdleCycles; + /** Total number of cycles spent blocked. */ + Stats::Scalar<> fetchBlockedCycles; + /** Total number of cycles spent in any other state. */ + Stats::Scalar<> fetchMiscStallCycles; + /** Stat for total number of fetched cache lines. */ + Stats::Scalar<> fetchedCacheLines; + /** Total number of outstanding icache accesses that were dropped + * due to a squash. + */ + Stats::Scalar<> fetchIcacheSquashes; + /** Distribution of number of instructions fetched each cycle. */ + Stats::Distribution<> fetchNisnDist; + /** Rate of how often fetch was idle. */ + Stats::Formula idleRate; + /** Number of branch fetches per cycle. */ + Stats::Formula branchRate; + /** Number of instruction fetched per cycle. */ + Stats::Formula fetchRate; +}; + +#endif //__CPU_O3_FETCH_HH__ diff --git a/src/cpu/o3/fetch_impl.hh b/src/cpu/o3/fetch_impl.hh new file mode 100644 index 000000000..2d447bfe5 --- /dev/null +++ b/src/cpu/o3/fetch_impl.hh @@ -0,0 +1,1445 @@ +/* + * Copyright (c) 2004-2006 The Regents of The University of Michigan + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are + * met: redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer; + * redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution; + * neither the name of the copyright holders nor the names of its + * contributors may be used to endorse or promote products derived from + * this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + * Authors: Kevin Lim + * Korey Sewell + */ + +#include "config/use_checker.hh" + +#include "arch/isa_traits.hh" +#include "arch/utility.hh" +#include "cpu/checker/cpu.hh" +#include "cpu/exetrace.hh" +#include "cpu/o3/fetch.hh" +#include "mem/packet.hh" +#include "mem/request.hh" +#include "sim/byteswap.hh" +#include "sim/host.hh" +#include "sim/root.hh" + +#if FULL_SYSTEM +#include "arch/tlb.hh" +#include "arch/vtophys.hh" +#include "base/remote_gdb.hh" +#include "sim/system.hh" +#endif // FULL_SYSTEM + +#include <algorithm> + +template<class Impl> +Tick +DefaultFetch<Impl>::IcachePort::recvAtomic(PacketPtr pkt) +{ + panic("DefaultFetch doesn't expect recvAtomic callback!"); + return curTick; +} + +template<class Impl> +void +DefaultFetch<Impl>::IcachePort::recvFunctional(PacketPtr pkt) +{ + panic("DefaultFetch doesn't expect recvFunctional callback!"); +} + +template<class Impl> +void +DefaultFetch<Impl>::IcachePort::recvStatusChange(Status status) +{ + if (status == RangeChange) + return; + + panic("DefaultFetch doesn't expect recvStatusChange callback!"); +} + +template<class Impl> +bool +DefaultFetch<Impl>::IcachePort::recvTiming(Packet *pkt) +{ + fetch->processCacheCompletion(pkt); + return true; +} + +template<class Impl> +void +DefaultFetch<Impl>::IcachePort::recvRetry() +{ + fetch->recvRetry(); +} + +template<class Impl> +DefaultFetch<Impl>::DefaultFetch(Params *params) + : mem(params->mem), + branchPred(params), + decodeToFetchDelay(params->decodeToFetchDelay), + renameToFetchDelay(params->renameToFetchDelay), + iewToFetchDelay(params->iewToFetchDelay), + commitToFetchDelay(params->commitToFetchDelay), + fetchWidth(params->fetchWidth), + cacheBlocked(false), + retryPkt(NULL), + retryTid(-1), + numThreads(params->numberOfThreads), + numFetchingThreads(params->smtNumFetchingThreads), + interruptPending(false), + drainPending(false), + switchedOut(false) +{ + if (numThreads > Impl::MaxThreads) + fatal("numThreads is not a valid value\n"); + + // Set fetch stage's status to inactive. + _status = Inactive; + + std::string policy = params->smtFetchPolicy; + + // Convert string to lowercase + std::transform(policy.begin(), policy.end(), policy.begin(), + (int(*)(int)) tolower); + + // Figure out fetch policy + if (policy == "singlethread") { + fetchPolicy = SingleThread; + if (numThreads > 1) + panic("Invalid Fetch Policy for a SMT workload."); + } else if (policy == "roundrobin") { + fetchPolicy = RoundRobin; + DPRINTF(Fetch, "Fetch policy set to Round Robin\n"); + } else if (policy == "branch") { + fetchPolicy = Branch; + DPRINTF(Fetch, "Fetch policy set to Branch Count\n"); + } else if (policy == "iqcount") { + fetchPolicy = IQ; + DPRINTF(Fetch, "Fetch policy set to IQ count\n"); + } else if (policy == "lsqcount") { + fetchPolicy = LSQ; + DPRINTF(Fetch, "Fetch policy set to LSQ count\n"); + } else { + fatal("Invalid Fetch Policy. Options Are: {SingleThread," + " RoundRobin,LSQcount,IQcount}\n"); + } + + // Size of cache block. + cacheBlkSize = 64; + + // Create mask to get rid of offset bits. + cacheBlkMask = (cacheBlkSize - 1); + + for (int tid=0; tid < numThreads; tid++) { + + fetchStatus[tid] = Running; + + priorityList.push_back(tid); + + memReq[tid] = NULL; + + // Create space to store a cache line. + cacheData[tid] = new uint8_t[cacheBlkSize]; + cacheDataPC[tid] = 0; + cacheDataValid[tid] = false; + + delaySlotInfo[tid].branchSeqNum = -1; + delaySlotInfo[tid].numInsts = 0; + delaySlotInfo[tid].targetAddr = 0; + delaySlotInfo[tid].targetReady = false; + + stalls[tid].decode = false; + stalls[tid].rename = false; + stalls[tid].iew = false; + stalls[tid].commit = false; + } + + // Get the size of an instruction. + instSize = sizeof(TheISA::MachInst); +} + +template <class Impl> +std::string +DefaultFetch<Impl>::name() const +{ + return cpu->name() + ".fetch"; +} + +template <class Impl> +void +DefaultFetch<Impl>::regStats() +{ + icacheStallCycles + .name(name() + ".icacheStallCycles") + .desc("Number of cycles fetch is stalled on an Icache miss") + .prereq(icacheStallCycles); + + fetchedInsts + .name(name() + ".Insts") + .desc("Number of instructions fetch has processed") + .prereq(fetchedInsts); + + fetchedBranches + .name(name() + ".Branches") + .desc("Number of branches that fetch encountered") + .prereq(fetchedBranches); + + predictedBranches + .name(name() + ".predictedBranches") + .desc("Number of branches that fetch has predicted taken") + .prereq(predictedBranches); + + fetchCycles + .name(name() + ".Cycles") + .desc("Number of cycles fetch has run and was not squashing or" + " blocked") + .prereq(fetchCycles); + + fetchSquashCycles + .name(name() + ".SquashCycles") + .desc("Number of cycles fetch has spent squashing") + .prereq(fetchSquashCycles); + + fetchIdleCycles + .name(name() + ".IdleCycles") + .desc("Number of cycles fetch was idle") + .prereq(fetchIdleCycles); + + fetchBlockedCycles + .name(name() + ".BlockedCycles") + .desc("Number of cycles fetch has spent blocked") + .prereq(fetchBlockedCycles); + + fetchedCacheLines + .name(name() + ".CacheLines") + .desc("Number of cache lines fetched") + .prereq(fetchedCacheLines); + + fetchMiscStallCycles + .name(name() + ".MiscStallCycles") + .desc("Number of cycles fetch has spent waiting on interrupts, or " + "bad addresses, or out of MSHRs") + .prereq(fetchMiscStallCycles); + + fetchIcacheSquashes + .name(name() + ".IcacheSquashes") + .desc("Number of outstanding Icache misses that were squashed") + .prereq(fetchIcacheSquashes); + + fetchNisnDist + .init(/* base value */ 0, + /* last value */ fetchWidth, + /* bucket size */ 1) + .name(name() + ".rateDist") + .desc("Number of instructions fetched each cycle (Total)") + .flags(Stats::pdf); + + idleRate + .name(name() + ".idleRate") + .desc("Percent of cycles fetch was idle") + .prereq(idleRate); + idleRate = fetchIdleCycles * 100 / cpu->numCycles; + + branchRate + .name(name() + ".branchRate") + .desc("Number of branch fetches per cycle") + .flags(Stats::total); + branchRate = fetchedBranches / cpu->numCycles; + + fetchRate + .name(name() + ".rate") + .desc("Number of inst fetches per cycle") + .flags(Stats::total); + fetchRate = fetchedInsts / cpu->numCycles; + + branchPred.regStats(); +} + +template<class Impl> +void +DefaultFetch<Impl>::setCPU(O3CPU *cpu_ptr) +{ + DPRINTF(Fetch, "Setting the CPU pointer.\n"); + cpu = cpu_ptr; + + // Name is finally available, so create the port. + icachePort = new IcachePort(this); + +#if USE_CHECKER + if (cpu->checker) { + cpu->checker->setIcachePort(icachePort); + } +#endif + + // Schedule fetch to get the correct PC from the CPU + // scheduleFetchStartupEvent(1); + + // Fetch needs to start fetching instructions at the very beginning, + // so it must start up in active state. + switchToActive(); +} + +template<class Impl> +void +DefaultFetch<Impl>::setTimeBuffer(TimeBuffer<TimeStruct> *time_buffer) +{ + DPRINTF(Fetch, "Setting the time buffer pointer.\n"); + timeBuffer = time_buffer; + + // Create wires to get information from proper places in time buffer. + fromDecode = timeBuffer->getWire(-decodeToFetchDelay); + fromRename = timeBuffer->getWire(-renameToFetchDelay); + fromIEW = timeBuffer->getWire(-iewToFetchDelay); + fromCommit = timeBuffer->getWire(-commitToFetchDelay); +} + +template<class Impl> +void +DefaultFetch<Impl>::setActiveThreads(std::list<unsigned> *at_ptr) +{ + DPRINTF(Fetch, "Setting active threads list pointer.\n"); + activeThreads = at_ptr; +} + +template<class Impl> +void +DefaultFetch<Impl>::setFetchQueue(TimeBuffer<FetchStruct> *fq_ptr) +{ + DPRINTF(Fetch, "Setting the fetch queue pointer.\n"); + fetchQueue = fq_ptr; + + // Create wire to write information to proper place in fetch queue. + toDecode = fetchQueue->getWire(0); +} + +template<class Impl> +void +DefaultFetch<Impl>::initStage() +{ + // Setup PC and nextPC with initial state. + for (int tid = 0; tid < numThreads; tid++) { + PC[tid] = cpu->readPC(tid); + nextPC[tid] = cpu->readNextPC(tid); +#if ISA_HAS_DELAY_SLOT + nextNPC[tid] = cpu->readNextNPC(tid); +#endif + } +} + +template<class Impl> +void +DefaultFetch<Impl>::processCacheCompletion(PacketPtr pkt) +{ + unsigned tid = pkt->req->getThreadNum(); + + DPRINTF(Fetch, "[tid:%u] Waking up from cache miss.\n",tid); + + // Only change the status if it's still waiting on the icache access + // to return. + if (fetchStatus[tid] != IcacheWaitResponse || + pkt->req != memReq[tid] || + isSwitchedOut()) { + ++fetchIcacheSquashes; + delete pkt->req; + delete pkt; + return; + } + + memcpy(cacheData[tid], pkt->getPtr<uint8_t *>(), cacheBlkSize); + cacheDataValid[tid] = true; + + if (!drainPending) { + // Wake up the CPU (if it went to sleep and was waiting on + // this completion event). + cpu->wakeCPU(); + + DPRINTF(Activity, "[tid:%u] Activating fetch due to cache completion\n", + tid); + + switchToActive(); + } + + // Only switch to IcacheAccessComplete if we're not stalled as well. + if (checkStall(tid)) { + fetchStatus[tid] = Blocked; + } else { + fetchStatus[tid] = IcacheAccessComplete; + } + + // Reset the mem req to NULL. + delete pkt->req; + delete pkt; + memReq[tid] = NULL; +} + +template <class Impl> +bool +DefaultFetch<Impl>::drain() +{ + // Fetch is ready to drain at any time. + cpu->signalDrained(); + drainPending = true; + return true; +} + +template <class Impl> +void +DefaultFetch<Impl>::resume() +{ + drainPending = false; +} + +template <class Impl> +void +DefaultFetch<Impl>::switchOut() +{ + switchedOut = true; + // Branch predictor needs to have its state cleared. + branchPred.switchOut(); +} + +template <class Impl> +void +DefaultFetch<Impl>::takeOverFrom() +{ + // Reset all state + for (int i = 0; i < Impl::MaxThreads; ++i) { + stalls[i].decode = 0; + stalls[i].rename = 0; + stalls[i].iew = 0; + stalls[i].commit = 0; + PC[i] = cpu->readPC(i); + nextPC[i] = cpu->readNextPC(i); +#if ISA_HAS_DELAY_SLOT + nextNPC[i] = cpu->readNextNPC(i); + delaySlotInfo[i].branchSeqNum = -1; + delaySlotInfo[i].numInsts = 0; + delaySlotInfo[i].targetAddr = 0; + delaySlotInfo[i].targetReady = false; +#endif + fetchStatus[i] = Running; + } + numInst = 0; + wroteToTimeBuffer = false; + _status = Inactive; + switchedOut = false; + interruptPending = false; + branchPred.takeOverFrom(); +} + +template <class Impl> +void +DefaultFetch<Impl>::wakeFromQuiesce() +{ + DPRINTF(Fetch, "Waking up from quiesce\n"); + // Hopefully this is safe + // @todo: Allow other threads to wake from quiesce. + fetchStatus[0] = Running; +} + +template <class Impl> +inline void +DefaultFetch<Impl>::switchToActive() +{ + if (_status == Inactive) { + DPRINTF(Activity, "Activating stage.\n"); + + cpu->activateStage(O3CPU::FetchIdx); + + _status = Active; + } +} + +template <class Impl> +inline void +DefaultFetch<Impl>::switchToInactive() +{ + if (_status == Active) { + DPRINTF(Activity, "Deactivating stage.\n"); + + cpu->deactivateStage(O3CPU::FetchIdx); + + _status = Inactive; + } +} + +template <class Impl> +bool +DefaultFetch<Impl>::lookupAndUpdateNextPC(DynInstPtr &inst, Addr &next_PC, + Addr &next_NPC) +{ + // Do branch prediction check here. + // A bit of a misnomer...next_PC is actually the current PC until + // this function updates it. + bool predict_taken; + + if (!inst->isControl()) { +#if ISA_HAS_DELAY_SLOT + Addr cur_PC = next_PC; + next_PC = cur_PC + instSize; //next_NPC; + next_NPC = cur_PC + (2 * instSize);//next_NPC + instSize; + inst->setPredTarg(next_NPC); +#else + next_PC = next_PC + instSize; + inst->setPredTarg(next_PC); +#endif + return false; + } + + int tid = inst->threadNumber; +#if ISA_HAS_DELAY_SLOT + Addr pred_PC = next_PC; + predict_taken = branchPred.predict(inst, pred_PC, tid); + + if (predict_taken) { + DPRINTF(Fetch, "[tid:%i]: Branch predicted to be true.\n", tid); + } else { + DPRINTF(Fetch, "[tid:%i]: Branch predicted to be false.\n", tid); + } + + if (predict_taken) { + next_PC = next_NPC; + next_NPC = pred_PC; + + // Update delay slot info + ++delaySlotInfo[tid].numInsts; + delaySlotInfo[tid].targetAddr = pred_PC; + DPRINTF(Fetch, "[tid:%i]: %i delay slot inst(s) to process.\n", tid, + delaySlotInfo[tid].numInsts); + } else { // !predict_taken + if (inst->isCondDelaySlot()) { + next_PC = pred_PC; + // The delay slot is skipped here if there is on + // prediction + } else { + next_PC = next_NPC; + // No need to declare a delay slot here since + // there is no for the pred. target to jump + } + + next_NPC = next_NPC + instSize; + } +#else + predict_taken = branchPred.predict(inst, next_PC, tid); +#endif + + ++fetchedBranches; + + if (predict_taken) { + ++predictedBranches; + } + + return predict_taken; +} + +template <class Impl> +bool +DefaultFetch<Impl>::fetchCacheLine(Addr fetch_PC, Fault &ret_fault, unsigned tid) +{ + Fault fault = NoFault; + +#if FULL_SYSTEM + // Flag to say whether or not address is physical addr. + unsigned flags = cpu->inPalMode(fetch_PC) ? PHYSICAL : 0; +#else + unsigned flags = 0; +#endif // FULL_SYSTEM + + if (cacheBlocked || isSwitchedOut() || (interruptPending && flags == 0)) { + // Hold off fetch from getting new instructions when: + // Cache is blocked, or + // while an interrupt is pending and we're not in PAL mode, or + // fetch is switched out. + return false; + } + + // Align the fetch PC so it's at the start of a cache block. + fetch_PC = icacheBlockAlignPC(fetch_PC); + + // If we've already got the block, no need to try to fetch it again. + if (cacheDataValid[tid] && fetch_PC == cacheDataPC[tid]) { + return true; + } + + // Setup the memReq to do a read of the first instruction's address. + // Set the appropriate read size and flags as well. + // Build request here. + RequestPtr mem_req = new Request(tid, fetch_PC, cacheBlkSize, flags, + fetch_PC, cpu->readCpuId(), tid); + + memReq[tid] = mem_req; + + // Translate the instruction request. + fault = cpu->translateInstReq(mem_req, cpu->thread[tid]); + + // In the case of faults, the fetch stage may need to stall and wait + // for the ITB miss to be handled. + + // If translation was successful, attempt to read the first + // instruction. + if (fault == NoFault) { +#if 0 + if (cpu->system->memctrl->badaddr(memReq[tid]->paddr) || + memReq[tid]->flags & UNCACHEABLE) { + DPRINTF(Fetch, "Fetch: Bad address %#x (hopefully on a " + "misspeculating path)!", + memReq[tid]->paddr); + ret_fault = TheISA::genMachineCheckFault(); + return false; + } +#endif + + // Build packet here. + PacketPtr data_pkt = new Packet(mem_req, + Packet::ReadReq, Packet::Broadcast); + data_pkt->dataDynamicArray(new uint8_t[cacheBlkSize]); + + cacheDataPC[tid] = fetch_PC; + cacheDataValid[tid] = false; + + DPRINTF(Fetch, "Fetch: Doing instruction read.\n"); + + fetchedCacheLines++; + + // Now do the timing access to see whether or not the instruction + // exists within the cache. + if (!icachePort->sendTiming(data_pkt)) { + assert(retryPkt == NULL); + assert(retryTid == -1); + DPRINTF(Fetch, "[tid:%i] Out of MSHRs!\n", tid); + fetchStatus[tid] = IcacheWaitRetry; + retryPkt = data_pkt; + retryTid = tid; + cacheBlocked = true; + return false; + } + + DPRINTF(Fetch, "[tid:%i]: Doing cache access.\n", tid); + + lastIcacheStall[tid] = curTick; + + DPRINTF(Activity, "[tid:%i]: Activity: Waiting on I-cache " + "response.\n", tid); + + fetchStatus[tid] = IcacheWaitResponse; + } else { + delete mem_req; + memReq[tid] = NULL; + } + + ret_fault = fault; + return true; +} + +template <class Impl> +inline void +DefaultFetch<Impl>::doSquash(const Addr &new_PC, unsigned tid) +{ + DPRINTF(Fetch, "[tid:%i]: Squashing, setting PC to: %#x.\n", + tid, new_PC); + + PC[tid] = new_PC; + nextPC[tid] = new_PC + instSize; + nextNPC[tid] = new_PC + (2 * instSize); + + // Clear the icache miss if it's outstanding. + if (fetchStatus[tid] == IcacheWaitResponse) { + DPRINTF(Fetch, "[tid:%i]: Squashing outstanding Icache miss.\n", + tid); + memReq[tid] = NULL; + } + + // Get rid of the retrying packet if it was from this thread. + if (retryTid == tid) { + assert(cacheBlocked); + cacheBlocked = false; + retryTid = -1; + delete retryPkt->req; + delete retryPkt; + retryPkt = NULL; + } + + fetchStatus[tid] = Squashing; + + ++fetchSquashCycles; +} + +template<class Impl> +void +DefaultFetch<Impl>::squashFromDecode(const Addr &new_PC, + const InstSeqNum &seq_num, + unsigned tid) +{ + DPRINTF(Fetch, "[tid:%i]: Squashing from decode.\n",tid); + + doSquash(new_PC, tid); + +#if ISA_HAS_DELAY_SLOT + if (seq_num <= delaySlotInfo[tid].branchSeqNum) { + delaySlotInfo[tid].numInsts = 0; + delaySlotInfo[tid].targetAddr = 0; + delaySlotInfo[tid].targetReady = false; + } +#endif + + // Tell the CPU to remove any instructions that are in flight between + // fetch and decode. + cpu->removeInstsUntil(seq_num, tid); +} + +template<class Impl> +bool +DefaultFetch<Impl>::checkStall(unsigned tid) const +{ + bool ret_val = false; + + if (cpu->contextSwitch) { + DPRINTF(Fetch,"[tid:%i]: Stalling for a context switch.\n",tid); + ret_val = true; + } else if (stalls[tid].decode) { + DPRINTF(Fetch,"[tid:%i]: Stall from Decode stage detected.\n",tid); + ret_val = true; + } else if (stalls[tid].rename) { + DPRINTF(Fetch,"[tid:%i]: Stall from Rename stage detected.\n",tid); + ret_val = true; + } else if (stalls[tid].iew) { + DPRINTF(Fetch,"[tid:%i]: Stall from IEW stage detected.\n",tid); + ret_val = true; + } else if (stalls[tid].commit) { + DPRINTF(Fetch,"[tid:%i]: Stall from Commit stage detected.\n",tid); + ret_val = true; + } + + return ret_val; +} + +template<class Impl> +typename DefaultFetch<Impl>::FetchStatus +DefaultFetch<Impl>::updateFetchStatus() +{ + //Check Running + std::list<unsigned>::iterator threads = (*activeThreads).begin(); + + while (threads != (*activeThreads).end()) { + + unsigned tid = *threads++; + + if (fetchStatus[tid] == Running || + fetchStatus[tid] == Squashing || + fetchStatus[tid] == IcacheAccessComplete) { + + if (_status == Inactive) { + DPRINTF(Activity, "[tid:%i]: Activating stage.\n",tid); + + if (fetchStatus[tid] == IcacheAccessComplete) { + DPRINTF(Activity, "[tid:%i]: Activating fetch due to cache" + "completion\n",tid); + } + + cpu->activateStage(O3CPU::FetchIdx); + } + + return Active; + } + } + + // Stage is switching from active to inactive, notify CPU of it. + if (_status == Active) { + DPRINTF(Activity, "Deactivating stage.\n"); + + cpu->deactivateStage(O3CPU::FetchIdx); + } + + return Inactive; +} + +template <class Impl> +void +DefaultFetch<Impl>::squash(const Addr &new_PC, const InstSeqNum &seq_num, + bool squash_delay_slot, unsigned tid) +{ + DPRINTF(Fetch, "[tid:%u]: Squash from commit.\n",tid); + + doSquash(new_PC, tid); + +#if ISA_HAS_DELAY_SLOT + if (seq_num <= delaySlotInfo[tid].branchSeqNum) { + delaySlotInfo[tid].numInsts = 0; + delaySlotInfo[tid].targetAddr = 0; + delaySlotInfo[tid].targetReady = false; + } + + // Tell the CPU to remove any instructions that are not in the ROB. + cpu->removeInstsNotInROB(tid, squash_delay_slot, seq_num); +#else + // Tell the CPU to remove any instructions that are not in the ROB. + cpu->removeInstsNotInROB(tid, true, 0); +#endif +} + +template <class Impl> +void +DefaultFetch<Impl>::tick() +{ + std::list<unsigned>::iterator threads = (*activeThreads).begin(); + bool status_change = false; + + wroteToTimeBuffer = false; + + while (threads != (*activeThreads).end()) { + unsigned tid = *threads++; + + // Check the signals for each thread to determine the proper status + // for each thread. + bool updated_status = checkSignalsAndUpdate(tid); + status_change = status_change || updated_status; + } + + DPRINTF(Fetch, "Running stage.\n"); + + // Reset the number of the instruction we're fetching. + numInst = 0; + +#if FULL_SYSTEM + if (fromCommit->commitInfo[0].interruptPending) { + interruptPending = true; + } + + if (fromCommit->commitInfo[0].clearInterrupt) { + interruptPending = false; + } +#endif + + for (threadFetched = 0; threadFetched < numFetchingThreads; + threadFetched++) { + // Fetch each of the actively fetching threads. + fetch(status_change); + } + + // Record number of instructions fetched this cycle for distribution. + fetchNisnDist.sample(numInst); + + if (status_change) { + // Change the fetch stage status if there was a status change. + _status = updateFetchStatus(); + } + + // If there was activity this cycle, inform the CPU of it. + if (wroteToTimeBuffer || cpu->contextSwitch) { + DPRINTF(Activity, "Activity this cycle.\n"); + + cpu->activityThisCycle(); + } +} + +template <class Impl> +bool +DefaultFetch<Impl>::checkSignalsAndUpdate(unsigned tid) +{ + // Update the per thread stall statuses. + if (fromDecode->decodeBlock[tid]) { + stalls[tid].decode = true; + } + + if (fromDecode->decodeUnblock[tid]) { + assert(stalls[tid].decode); + assert(!fromDecode->decodeBlock[tid]); + stalls[tid].decode = false; + } + + if (fromRename->renameBlock[tid]) { + stalls[tid].rename = true; + } + + if (fromRename->renameUnblock[tid]) { + assert(stalls[tid].rename); + assert(!fromRename->renameBlock[tid]); + stalls[tid].rename = false; + } + + if (fromIEW->iewBlock[tid]) { + stalls[tid].iew = true; + } + + if (fromIEW->iewUnblock[tid]) { + assert(stalls[tid].iew); + assert(!fromIEW->iewBlock[tid]); + stalls[tid].iew = false; + } + + if (fromCommit->commitBlock[tid]) { + stalls[tid].commit = true; + } + + if (fromCommit->commitUnblock[tid]) { + assert(stalls[tid].commit); + assert(!fromCommit->commitBlock[tid]); + stalls[tid].commit = false; + } + + // Check squash signals from commit. + if (fromCommit->commitInfo[tid].squash) { + + DPRINTF(Fetch, "[tid:%u]: Squashing instructions due to squash " + "from commit.\n",tid); + +#if ISA_HAS_DELAY_SLOT + InstSeqNum doneSeqNum = fromCommit->commitInfo[tid].bdelayDoneSeqNum; +#else + InstSeqNum doneSeqNum = fromCommit->commitInfo[tid].doneSeqNum; +#endif + // In any case, squash. + squash(fromCommit->commitInfo[tid].nextPC, + doneSeqNum, + fromCommit->commitInfo[tid].squashDelaySlot, + tid); + + // Also check if there's a mispredict that happened. + if (fromCommit->commitInfo[tid].branchMispredict) { + branchPred.squash(fromCommit->commitInfo[tid].doneSeqNum, + fromCommit->commitInfo[tid].nextPC, + fromCommit->commitInfo[tid].branchTaken, + tid); + } else { + branchPred.squash(fromCommit->commitInfo[tid].doneSeqNum, + tid); + } + + return true; + } else if (fromCommit->commitInfo[tid].doneSeqNum) { + // Update the branch predictor if it wasn't a squashed instruction + // that was broadcasted. + branchPred.update(fromCommit->commitInfo[tid].doneSeqNum, tid); + } + + // Check ROB squash signals from commit. + if (fromCommit->commitInfo[tid].robSquashing) { + DPRINTF(Fetch, "[tid:%u]: ROB is still squashing.\n", tid); + + // Continue to squash. + fetchStatus[tid] = Squashing; + + return true; + } + + // Check squash signals from decode. + if (fromDecode->decodeInfo[tid].squash) { + DPRINTF(Fetch, "[tid:%u]: Squashing instructions due to squash " + "from decode.\n",tid); + + // Update the branch predictor. + if (fromDecode->decodeInfo[tid].branchMispredict) { + branchPred.squash(fromDecode->decodeInfo[tid].doneSeqNum, + fromDecode->decodeInfo[tid].nextPC, + fromDecode->decodeInfo[tid].branchTaken, + tid); + } else { + branchPred.squash(fromDecode->decodeInfo[tid].doneSeqNum, + tid); + } + + if (fetchStatus[tid] != Squashing) { + +#if ISA_HAS_DELAY_SLOT + InstSeqNum doneSeqNum = fromDecode->decodeInfo[tid].bdelayDoneSeqNum; +#else + InstSeqNum doneSeqNum = fromDecode->decodeInfo[tid].doneSeqNum; +#endif + // Squash unless we're already squashing + squashFromDecode(fromDecode->decodeInfo[tid].nextPC, + doneSeqNum, + tid); + + return true; + } + } + + if (checkStall(tid) && fetchStatus[tid] != IcacheWaitResponse) { + DPRINTF(Fetch, "[tid:%i]: Setting to blocked\n",tid); + + fetchStatus[tid] = Blocked; + + return true; + } + + if (fetchStatus[tid] == Blocked || + fetchStatus[tid] == Squashing) { + // Switch status to running if fetch isn't being told to block or + // squash this cycle. + DPRINTF(Fetch, "[tid:%i]: Done squashing, switching to running.\n", + tid); + + fetchStatus[tid] = Running; + + return true; + } + + // If we've reached this point, we have not gotten any signals that + // cause fetch to change its status. Fetch remains the same as before. + return false; +} + +template<class Impl> +void +DefaultFetch<Impl>::fetch(bool &status_change) +{ + ////////////////////////////////////////// + // Start actual fetch + ////////////////////////////////////////// + int tid = getFetchingThread(fetchPolicy); + + if (tid == -1 || drainPending) { + DPRINTF(Fetch,"There are no more threads available to fetch from.\n"); + + // Breaks looping condition in tick() + threadFetched = numFetchingThreads; + return; + } + + DPRINTF(Fetch, "Attempting to fetch from [tid:%i]\n", tid); + + // The current PC. + Addr &fetch_PC = PC[tid]; + + // Fault code for memory access. + Fault fault = NoFault; + + // If returning from the delay of a cache miss, then update the status + // to running, otherwise do the cache access. Possibly move this up + // to tick() function. + if (fetchStatus[tid] == IcacheAccessComplete) { + DPRINTF(Fetch, "[tid:%i]: Icache miss is complete.\n", + tid); + + fetchStatus[tid] = Running; + status_change = true; + } else if (fetchStatus[tid] == Running) { + DPRINTF(Fetch, "[tid:%i]: Attempting to translate and read " + "instruction, starting at PC %08p.\n", + tid, fetch_PC); + + bool fetch_success = fetchCacheLine(fetch_PC, fault, tid); + if (!fetch_success) { + if (cacheBlocked) { + ++icacheStallCycles; + } else { + ++fetchMiscStallCycles; + } + return; + } + } else { + if (fetchStatus[tid] == Idle) { + ++fetchIdleCycles; + } else if (fetchStatus[tid] == Blocked) { + ++fetchBlockedCycles; + } else if (fetchStatus[tid] == Squashing) { + ++fetchSquashCycles; + } else if (fetchStatus[tid] == IcacheWaitResponse) { + ++icacheStallCycles; + } + + // Status is Idle, Squashing, Blocked, or IcacheWaitResponse, so + // fetch should do nothing. + return; + } + + ++fetchCycles; + + // If we had a stall due to an icache miss, then return. + if (fetchStatus[tid] == IcacheWaitResponse) { + ++icacheStallCycles; + status_change = true; + return; + } + + Addr next_PC = fetch_PC; + Addr next_NPC = next_PC + instSize; + InstSeqNum inst_seq; + MachInst inst; + ExtMachInst ext_inst; + // @todo: Fix this hack. + unsigned offset = (fetch_PC & cacheBlkMask) & ~3; + + if (fault == NoFault) { + // If the read of the first instruction was successful, then grab the + // instructions from the rest of the cache line and put them into the + // queue heading to decode. + + DPRINTF(Fetch, "[tid:%i]: Adding instructions to queue to " + "decode.\n",tid); + + // Need to keep track of whether or not a predicted branch + // ended this fetch block. + bool predicted_branch = false; + + // Need to keep track of whether or not a delay slot + // instruction has been fetched + + for (; + offset < cacheBlkSize && + numInst < fetchWidth && + (!predicted_branch || delaySlotInfo[tid].numInsts > 0); + ++numInst) { + + // Get a sequence number. + inst_seq = cpu->getAndIncrementInstSeq(); + + // Make sure this is a valid index. + assert(offset <= cacheBlkSize - instSize); + + // Get the instruction from the array of the cache line. + inst = TheISA::gtoh(*reinterpret_cast<TheISA::MachInst *> + (&cacheData[tid][offset])); + + ext_inst = TheISA::makeExtMI(inst, fetch_PC); + + // Create a new DynInst from the instruction fetched. + DynInstPtr instruction = new DynInst(ext_inst, fetch_PC, + next_PC, + inst_seq, cpu); + instruction->setTid(tid); + + instruction->setASID(tid); + + instruction->setThreadState(cpu->thread[tid]); + + DPRINTF(Fetch, "[tid:%i]: Instruction PC %#x created " + "[sn:%lli]\n", + tid, instruction->readPC(), inst_seq); + + DPRINTF(Fetch, "[tid:%i]: Instruction is: %s\n", + tid, instruction->staticInst->disassemble(fetch_PC)); + + instruction->traceData = + Trace::getInstRecord(curTick, cpu->tcBase(tid), + instruction->staticInst, + instruction->readPC()); + + predicted_branch = lookupAndUpdateNextPC(instruction, next_PC, + next_NPC); + + // Add instruction to the CPU's list of instructions. + instruction->setInstListIt(cpu->addInst(instruction)); + + // Write the instruction to the first slot in the queue + // that heads to decode. + toDecode->insts[numInst] = instruction; + + toDecode->size++; + + // Increment stat of fetched instructions. + ++fetchedInsts; + + // Move to the next instruction, unless we have a branch. + fetch_PC = next_PC; + + if (instruction->isQuiesce()) { +// warn("%lli: Quiesce instruction encountered, halting fetch!", +// curTick); + fetchStatus[tid] = QuiescePending; + ++numInst; + status_change = true; + break; + } + + offset += instSize; + +#if ISA_HAS_DELAY_SLOT + if (predicted_branch) { + delaySlotInfo[tid].branchSeqNum = inst_seq; + + DPRINTF(Fetch, "[tid:%i]: Delay slot branch set to [sn:%i]\n", + tid, inst_seq); + continue; + } else if (delaySlotInfo[tid].numInsts > 0) { + --delaySlotInfo[tid].numInsts; + + // It's OK to set PC to target of branch + if (delaySlotInfo[tid].numInsts == 0) { + delaySlotInfo[tid].targetReady = true; + + // Break the looping condition + predicted_branch = true; + } + + DPRINTF(Fetch, "[tid:%i]: %i delay slot inst(s) left to" + " process.\n", tid, delaySlotInfo[tid].numInsts); + } +#endif + } + + if (offset >= cacheBlkSize) { + DPRINTF(Fetch, "[tid:%i]: Done fetching, reached the end of cache " + "block.\n", tid); + } else if (numInst >= fetchWidth) { + DPRINTF(Fetch, "[tid:%i]: Done fetching, reached fetch bandwidth " + "for this cycle.\n", tid); + } else if (predicted_branch && delaySlotInfo[tid].numInsts <= 0) { + DPRINTF(Fetch, "[tid:%i]: Done fetching, predicted branch " + "instruction encountered.\n", tid); + } + } + + if (numInst > 0) { + wroteToTimeBuffer = true; + } + + // Now that fetching is completed, update the PC to signify what the next + // cycle will be. + if (fault == NoFault) { +#if ISA_HAS_DELAY_SLOT + if (delaySlotInfo[tid].targetReady && + delaySlotInfo[tid].numInsts == 0) { + // Set PC to target + PC[tid] = delaySlotInfo[tid].targetAddr; //next_PC + nextPC[tid] = next_PC + instSize; //next_NPC + nextNPC[tid] = next_PC + (2 * instSize); + + delaySlotInfo[tid].targetReady = false; + } else { + PC[tid] = next_PC; + nextPC[tid] = next_NPC; + nextNPC[tid] = next_NPC + instSize; + } + + DPRINTF(Fetch, "[tid:%i]: Setting PC to %08p.\n", tid, PC[tid]); +#else + DPRINTF(Fetch, "[tid:%i]: Setting PC to %08p.\n",tid, next_PC); + PC[tid] = next_PC; + nextPC[tid] = next_PC + instSize; +#endif + } else { + // We shouldn't be in an icache miss and also have a fault (an ITB + // miss) + if (fetchStatus[tid] == IcacheWaitResponse) { + panic("Fetch should have exited prior to this!"); + } + + // Send the fault to commit. This thread will not do anything + // until commit handles the fault. The only other way it can + // wake up is if a squash comes along and changes the PC. +#if FULL_SYSTEM + assert(numInst != fetchWidth); + // Get a sequence number. + inst_seq = cpu->getAndIncrementInstSeq(); + // We will use a nop in order to carry the fault. + ext_inst = TheISA::NoopMachInst; + + // Create a new DynInst from the dummy nop. + DynInstPtr instruction = new DynInst(ext_inst, fetch_PC, + next_PC, + inst_seq, cpu); + instruction->setPredTarg(next_PC + instSize); + instruction->setTid(tid); + + instruction->setASID(tid); + + instruction->setThreadState(cpu->thread[tid]); + + instruction->traceData = NULL; + + instruction->setInstListIt(cpu->addInst(instruction)); + + instruction->fault = fault; + + toDecode->insts[numInst] = instruction; + toDecode->size++; + + DPRINTF(Fetch, "[tid:%i]: Blocked, need to handle the trap.\n",tid); + + fetchStatus[tid] = TrapPending; + status_change = true; + +// warn("%lli fault (%d) detected @ PC %08p", curTick, fault, PC[tid]); +#else // !FULL_SYSTEM + warn("cycle %lli: fault (%s) detected @ PC %08p", curTick, fault->name(), PC[tid]); +#endif // FULL_SYSTEM + } +} + +template<class Impl> +void +DefaultFetch<Impl>::recvRetry() +{ + assert(cacheBlocked); + if (retryPkt != NULL) { + assert(retryTid != -1); + assert(fetchStatus[retryTid] == IcacheWaitRetry); + + if (icachePort->sendTiming(retryPkt)) { + fetchStatus[retryTid] = IcacheWaitResponse; + retryPkt = NULL; + retryTid = -1; + cacheBlocked = false; + } + } else { + assert(retryTid == -1); + // Access has been squashed since it was sent out. Just clear + // the cache being blocked. + cacheBlocked = false; + } +} + +/////////////////////////////////////// +// // +// SMT FETCH POLICY MAINTAINED HERE // +// // +/////////////////////////////////////// +template<class Impl> +int +DefaultFetch<Impl>::getFetchingThread(FetchPriority &fetch_priority) +{ + if (numThreads > 1) { + switch (fetch_priority) { + + case SingleThread: + return 0; + + case RoundRobin: + return roundRobin(); + + case IQ: + return iqCount(); + + case LSQ: + return lsqCount(); + + case Branch: + return branchCount(); + + default: + return -1; + } + } else { + int tid = *((*activeThreads).begin()); + + if (fetchStatus[tid] == Running || + fetchStatus[tid] == IcacheAccessComplete || + fetchStatus[tid] == Idle) { + return tid; + } else { + return -1; + } + } + +} + + +template<class Impl> +int +DefaultFetch<Impl>::roundRobin() +{ + std::list<unsigned>::iterator pri_iter = priorityList.begin(); + std::list<unsigned>::iterator end = priorityList.end(); + + int high_pri; + + while (pri_iter != end) { + high_pri = *pri_iter; + + assert(high_pri <= numThreads); + + if (fetchStatus[high_pri] == Running || + fetchStatus[high_pri] == IcacheAccessComplete || + fetchStatus[high_pri] == Idle) { + + priorityList.erase(pri_iter); + priorityList.push_back(high_pri); + + return high_pri; + } + + pri_iter++; + } + + return -1; +} + +template<class Impl> +int +DefaultFetch<Impl>::iqCount() +{ + std::priority_queue<unsigned> PQ; + + std::list<unsigned>::iterator threads = (*activeThreads).begin(); + + while (threads != (*activeThreads).end()) { + unsigned tid = *threads++; + + PQ.push(fromIEW->iewInfo[tid].iqCount); + } + + while (!PQ.empty()) { + + unsigned high_pri = PQ.top(); + + if (fetchStatus[high_pri] == Running || + fetchStatus[high_pri] == IcacheAccessComplete || + fetchStatus[high_pri] == Idle) + return high_pri; + else + PQ.pop(); + + } + + return -1; +} + +template<class Impl> +int +DefaultFetch<Impl>::lsqCount() +{ + std::priority_queue<unsigned> PQ; + + + std::list<unsigned>::iterator threads = (*activeThreads).begin(); + + while (threads != (*activeThreads).end()) { + unsigned tid = *threads++; + + PQ.push(fromIEW->iewInfo[tid].ldstqCount); + } + + while (!PQ.empty()) { + + unsigned high_pri = PQ.top(); + + if (fetchStatus[high_pri] == Running || + fetchStatus[high_pri] == IcacheAccessComplete || + fetchStatus[high_pri] == Idle) + return high_pri; + else + PQ.pop(); + + } + + return -1; +} + +template<class Impl> +int +DefaultFetch<Impl>::branchCount() +{ + std::list<unsigned>::iterator threads = (*activeThreads).begin(); + panic("Branch Count Fetch policy unimplemented\n"); + return *threads; +} diff --git a/src/cpu/o3/free_list.cc b/src/cpu/o3/free_list.cc new file mode 100644 index 000000000..ae651398b --- /dev/null +++ b/src/cpu/o3/free_list.cc @@ -0,0 +1,72 @@ +/* + * Copyright (c) 2004-2005 The Regents of The University of Michigan + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are + * met: redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer; + * redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution; + * neither the name of the copyright holders nor the names of its + * contributors may be used to endorse or promote products derived from + * this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + * Authors: Kevin Lim + */ + +#include "base/trace.hh" + +#include "cpu/o3/free_list.hh" + +SimpleFreeList::SimpleFreeList(unsigned activeThreads, + unsigned _numLogicalIntRegs, + unsigned _numPhysicalIntRegs, + unsigned _numLogicalFloatRegs, + unsigned _numPhysicalFloatRegs) + : numLogicalIntRegs(_numLogicalIntRegs), + numPhysicalIntRegs(_numPhysicalIntRegs), + numLogicalFloatRegs(_numLogicalFloatRegs), + numPhysicalFloatRegs(_numPhysicalFloatRegs), + numPhysicalRegs(numPhysicalIntRegs + numPhysicalFloatRegs) +{ + DPRINTF(FreeList, "Creating new free list object.\n"); + + // Put all of the extra physical registers onto the free list. This + // means excluding all of the base logical registers. + for (PhysRegIndex i = numLogicalIntRegs * activeThreads; + i < numPhysicalIntRegs; ++i) + { + freeIntRegs.push(i); + } + + // Put all of the extra physical registers onto the free list. This + // means excluding all of the base logical registers. Because the + // float registers' indices start where the physical registers end, + // some math must be done to determine where the free registers start. + PhysRegIndex i = numPhysicalIntRegs + (numLogicalFloatRegs * activeThreads); + + for ( ; i < numPhysicalRegs; ++i) + { + freeFloatRegs.push(i); + } +} + +std::string +SimpleFreeList::name() const +{ + return "cpu.freelist"; +} diff --git a/src/cpu/o3/free_list.hh b/src/cpu/o3/free_list.hh new file mode 100644 index 000000000..c669b0b34 --- /dev/null +++ b/src/cpu/o3/free_list.hh @@ -0,0 +1,192 @@ +/* + * Copyright (c) 2004-2005 The Regents of The University of Michigan + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are + * met: redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer; + * redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution; + * neither the name of the copyright holders nor the names of its + * contributors may be used to endorse or promote products derived from + * this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + * Authors: Kevin Lim + */ + +#ifndef __CPU_O3_FREE_LIST_HH__ +#define __CPU_O3_FREE_LIST_HH__ + +#include <iostream> +#include <queue> + +#include "arch/isa_traits.hh" +#include "base/misc.hh" +#include "base/trace.hh" +#include "base/traceflags.hh" +#include "cpu/o3/comm.hh" + +/** + * FreeList class that simply holds the list of free integer and floating + * point registers. Can request for a free register of either type, and + * also send back free registers of either type. This is a very simple + * class, but it should be sufficient for most implementations. Like all + * other classes, it assumes that the indices for the floating point + * registers starts after the integer registers end. Hence the variable + * numPhysicalIntRegs is logically equivalent to the baseFP dependency. + * Note that while this most likely should be called FreeList, the name + * "FreeList" is used in a typedef within the CPU Policy, and therefore no + * class can be named simply "FreeList". + * @todo: Give a better name to the base FP dependency. + */ +class SimpleFreeList +{ + private: + /** The list of free integer registers. */ + std::queue<PhysRegIndex> freeIntRegs; + + /** The list of free floating point registers. */ + std::queue<PhysRegIndex> freeFloatRegs; + + /** Number of logical integer registers. */ + int numLogicalIntRegs; + + /** Number of physical integer registers. */ + int numPhysicalIntRegs; + + /** Number of logical floating point registers. */ + int numLogicalFloatRegs; + + /** Number of physical floating point registers. */ + int numPhysicalFloatRegs; + + /** Total number of physical registers. */ + int numPhysicalRegs; + + public: + /** Constructs a free list. + * @param activeThreads Number of active threads. + * @param _numLogicalIntRegs Number of logical integer registers. + * @param _numPhysicalIntRegs Number of physical integer registers. + * @param _numLogicalFloatRegs Number of logical fp registers. + * @param _numPhysicalFloatRegs Number of physical fp registers. + */ + SimpleFreeList(unsigned activeThreads, + unsigned _numLogicalIntRegs, + unsigned _numPhysicalIntRegs, + unsigned _numLogicalFloatRegs, + unsigned _numPhysicalFloatRegs); + + /** Gives the name of the freelist. */ + std::string name() const; + + /** Gets a free integer register. */ + inline PhysRegIndex getIntReg(); + + /** Gets a free fp register. */ + inline PhysRegIndex getFloatReg(); + + /** Adds a register back to the free list. */ + inline void addReg(PhysRegIndex freed_reg); + + /** Adds an integer register back to the free list. */ + inline void addIntReg(PhysRegIndex freed_reg); + + /** Adds a fp register back to the free list. */ + inline void addFloatReg(PhysRegIndex freed_reg); + + /** Checks if there are any free integer registers. */ + bool hasFreeIntRegs() + { return !freeIntRegs.empty(); } + + /** Checks if there are any free fp registers. */ + bool hasFreeFloatRegs() + { return !freeFloatRegs.empty(); } + + /** Returns the number of free integer registers. */ + int numFreeIntRegs() + { return freeIntRegs.size(); } + + /** Returns the number of free fp registers. */ + int numFreeFloatRegs() + { return freeFloatRegs.size(); } +}; + +inline PhysRegIndex +SimpleFreeList::getIntReg() +{ + DPRINTF(FreeList, "Trying to get free integer register.\n"); + + if (freeIntRegs.empty()) { + panic("No free integer registers!"); + } + + PhysRegIndex free_reg = freeIntRegs.front(); + + freeIntRegs.pop(); + + return(free_reg); +} + +inline PhysRegIndex +SimpleFreeList::getFloatReg() +{ + DPRINTF(FreeList, "Trying to get free float register.\n"); + + if (freeFloatRegs.empty()) { + panic("No free integer registers!"); + } + + PhysRegIndex free_reg = freeFloatRegs.front(); + + freeFloatRegs.pop(); + + return(free_reg); +} + +inline void +SimpleFreeList::addReg(PhysRegIndex freed_reg) +{ + DPRINTF(FreeList,"Freeing register %i.\n", freed_reg); + //Might want to add in a check for whether or not this register is + //already in there. A bit vector or something similar would be useful. + if (freed_reg < numPhysicalIntRegs) { + if (freed_reg != TheISA::ZeroReg) + freeIntRegs.push(freed_reg); + } else if (freed_reg < numPhysicalRegs) { + if (freed_reg != (TheISA::ZeroReg + numPhysicalIntRegs)) + freeFloatRegs.push(freed_reg); + } +} + +inline void +SimpleFreeList::addIntReg(PhysRegIndex freed_reg) +{ + DPRINTF(FreeList,"Freeing int register %i.\n", freed_reg); + + freeIntRegs.push(freed_reg); +} + +inline void +SimpleFreeList::addFloatReg(PhysRegIndex freed_reg) +{ + DPRINTF(FreeList,"Freeing float register %i.\n", freed_reg); + + freeFloatRegs.push(freed_reg); +} + +#endif // __CPU_O3_FREE_LIST_HH__ diff --git a/src/cpu/o3/fu_pool.cc b/src/cpu/o3/fu_pool.cc new file mode 100644 index 000000000..42e329aca --- /dev/null +++ b/src/cpu/o3/fu_pool.cc @@ -0,0 +1,299 @@ +/* + * Copyright (c) 2006 The Regents of The University of Michigan + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are + * met: redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer; + * redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution; + * neither the name of the copyright holders nor the names of its + * contributors may be used to endorse or promote products derived from + * this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + * Authors: Kevin Lim + */ + +#include <sstream> + +#include "cpu/o3/fu_pool.hh" +#include "cpu/func_unit.hh" +#include "sim/builder.hh" + +using namespace std; + +//////////////////////////////////////////////////////////////////////////// +// +// A pool of function units +// + +inline void +FUPool::FUIdxQueue::addFU(int fu_idx) +{ + funcUnitsIdx.push_back(fu_idx); + ++size; +} + +inline int +FUPool::FUIdxQueue::getFU() +{ + int retval = funcUnitsIdx[idx++]; + + if (idx == size) + idx = 0; + + return retval; +} + +FUPool::~FUPool() +{ + fuListIterator i = funcUnits.begin(); + fuListIterator end = funcUnits.end(); + for (; i != end; ++i) + delete *i; +} + + +// Constructor +FUPool::FUPool(string name, vector<FUDesc *> paramList) + : SimObject(name) +{ + numFU = 0; + + funcUnits.clear(); + + for (int i = 0; i < Num_OpClasses; ++i) { + maxOpLatencies[i] = 0; + maxIssueLatencies[i] = 0; + } + + // + // Iterate through the list of FUDescData structures + // + for (FUDDiterator i = paramList.begin(); i != paramList.end(); ++i) { + + // + // Don't bother with this if we're not going to create any FU's + // + if ((*i)->number) { + // + // Create the FuncUnit object from this structure + // - add the capabilities listed in the FU's operation + // description + // + // We create the first unit, then duplicate it as needed + // + FuncUnit *fu = new FuncUnit; + + OPDDiterator j = (*i)->opDescList.begin(); + OPDDiterator end = (*i)->opDescList.end(); + for (; j != end; ++j) { + // indicate that this pool has this capability + capabilityList.set((*j)->opClass); + + // Add each of the FU's that will have this capability to the + // appropriate queue. + for (int k = 0; k < (*i)->number; ++k) + fuPerCapList[(*j)->opClass].addFU(numFU + k); + + // indicate that this FU has the capability + fu->addCapability((*j)->opClass, (*j)->opLat, (*j)->issueLat); + + if ((*j)->opLat > maxOpLatencies[(*j)->opClass]) + maxOpLatencies[(*j)->opClass] = (*j)->opLat; + + if ((*j)->issueLat > maxIssueLatencies[(*j)->opClass]) + maxIssueLatencies[(*j)->opClass] = (*j)->issueLat; + } + + numFU++; + + // Add the appropriate number of copies of this FU to the list + ostringstream s; + + s << (*i)->name() << "(0)"; + fu->name = s.str(); + funcUnits.push_back(fu); + + for (int c = 1; c < (*i)->number; ++c) { + ostringstream s; + numFU++; + FuncUnit *fu2 = new FuncUnit(*fu); + + s << (*i)->name() << "(" << c << ")"; + fu2->name = s.str(); + funcUnits.push_back(fu2); + } + } + } + + unitBusy.resize(numFU); + + for (int i = 0; i < numFU; i++) { + unitBusy[i] = false; + } +} + +void +FUPool::annotateMemoryUnits(unsigned hit_latency) +{ + maxOpLatencies[MemReadOp] = hit_latency; + + fuListIterator i = funcUnits.begin(); + fuListIterator iend = funcUnits.end(); + for (; i != iend; ++i) { + if ((*i)->provides(MemReadOp)) + (*i)->opLatency(MemReadOp) = hit_latency; + + if ((*i)->provides(MemWriteOp)) + (*i)->opLatency(MemWriteOp) = hit_latency; + } +} + +int +FUPool::getUnit(OpClass capability) +{ + // If this pool doesn't have the specified capability, + // return this information to the caller + if (!capabilityList[capability]) + return -2; + + int fu_idx = fuPerCapList[capability].getFU(); + int start_idx = fu_idx; + + // Iterate through the circular queue if needed, stopping if we've reached + // the first element again. + while (unitBusy[fu_idx]) { + fu_idx = fuPerCapList[capability].getFU(); + if (fu_idx == start_idx) { + // No FU available + return -1; + } + } + + assert(fu_idx < numFU); + + unitBusy[fu_idx] = true; + + return fu_idx; +} + +void +FUPool::freeUnitNextCycle(int fu_idx) +{ + assert(unitBusy[fu_idx]); + unitsToBeFreed.push_back(fu_idx); +} + +void +FUPool::processFreeUnits() +{ + while (!unitsToBeFreed.empty()) { + int fu_idx = unitsToBeFreed.back(); + unitsToBeFreed.pop_back(); + + assert(unitBusy[fu_idx]); + + unitBusy[fu_idx] = false; + } +} + +void +FUPool::dump() +{ + cout << "Function Unit Pool (" << name() << ")\n"; + cout << "======================================\n"; + cout << "Free List:\n"; + + for (int i = 0; i < numFU; ++i) { + if (unitBusy[i]) { + continue; + } + + cout << " [" << i << "] : "; + + cout << funcUnits[i]->name << " "; + + cout << "\n"; + } + + cout << "======================================\n"; + cout << "Busy List:\n"; + for (int i = 0; i < numFU; ++i) { + if (!unitBusy[i]) { + continue; + } + + cout << " [" << i << "] : "; + + cout << funcUnits[i]->name << " "; + + cout << "\n"; + } +} + +void +FUPool::switchOut() +{ +} + +void +FUPool::takeOverFrom() +{ + for (int i = 0; i < numFU; i++) { + unitBusy[i] = false; + } + unitsToBeFreed.clear(); +} + +// + +//////////////////////////////////////////////////////////////////////////// +// +// The SimObjects we use to get the FU information into the simulator +// +//////////////////////////////////////////////////////////////////////////// + +// +// FUPool - Contails a list of FUDesc objects to make available +// + +// +// The FuPool object +// + +BEGIN_DECLARE_SIM_OBJECT_PARAMS(FUPool) + + SimObjectVectorParam<FUDesc *> FUList; + +END_DECLARE_SIM_OBJECT_PARAMS(FUPool) + + +BEGIN_INIT_SIM_OBJECT_PARAMS(FUPool) + + INIT_PARAM(FUList, "list of FU's for this pool") + +END_INIT_SIM_OBJECT_PARAMS(FUPool) + + +CREATE_SIM_OBJECT(FUPool) +{ + return new FUPool(getInstanceName(), FUList); +} + +REGISTER_SIM_OBJECT("FUPool", FUPool) + diff --git a/src/cpu/o3/fu_pool.hh b/src/cpu/o3/fu_pool.hh new file mode 100644 index 000000000..52d83f056 --- /dev/null +++ b/src/cpu/o3/fu_pool.hh @@ -0,0 +1,167 @@ +/* + * Copyright (c) 2006 The Regents of The University of Michigan + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are + * met: redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer; + * redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution; + * neither the name of the copyright holders nor the names of its + * contributors may be used to endorse or promote products derived from + * this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + * Authors: Kevin Lim + */ + +#ifndef __CPU_O3_FU_POOL_HH__ +#define __CPU_O3_FU_POOL_HH__ + +#include <bitset> +#include <list> +#include <string> +#include <vector> + +#include "base/sched_list.hh" +#include "cpu/op_class.hh" +#include "sim/sim_object.hh" + +class FUDesc; +class FuncUnit; + +/** + * Pool of FU's, specific to the new CPU model. The old FU pool had lists of + * free units and busy units, and whenever a FU was needed it would iterate + * through the free units to find a FU that provided the capability. This pool + * has lists of units specific to each of the capabilities, and whenever a FU + * is needed, it iterates through that list to find a free unit. The previous + * FU pool would have to be ticked each cycle to update which units became + * free. This FU pool lets the IEW stage handle freeing units, which frees + * them as their scheduled execution events complete. This limits units in this + * model to either have identical issue and op latencies, or 1 cycle issue + * latencies. + */ +class FUPool : public SimObject +{ + private: + /** Maximum op execution latencies, per op class. */ + unsigned maxOpLatencies[Num_OpClasses]; + /** Maximum issue latencies, per op class. */ + unsigned maxIssueLatencies[Num_OpClasses]; + + /** Bitvector listing capabilities of this FU pool. */ + std::bitset<Num_OpClasses> capabilityList; + + /** Bitvector listing which FUs are busy. */ + std::vector<bool> unitBusy; + + /** List of units to be freed at the end of this cycle. */ + std::vector<int> unitsToBeFreed; + + /** + * Class that implements a circular queue to hold FU indices. The hope is + * that FUs that have been just used will be moved to the end of the queue + * by iterating through it, thus leaving free units at the head of the + * queue. + */ + class FUIdxQueue { + public: + /** Constructs a circular queue of FU indices. */ + FUIdxQueue() + : idx(0), size(0) + { } + + /** Adds a FU to the queue. */ + inline void addFU(int fu_idx); + + /** Returns the index of the FU at the head of the queue, and changes + * the index to the next element. + */ + inline int getFU(); + + private: + /** Circular queue index. */ + int idx; + + /** Size of the queue. */ + int size; + + /** Queue of FU indices. */ + std::vector<int> funcUnitsIdx; + }; + + /** Per op class queues of FUs that provide that capability. */ + FUIdxQueue fuPerCapList[Num_OpClasses]; + + /** Number of FUs. */ + int numFU; + + /** Functional units. */ + std::vector<FuncUnit *> funcUnits; + + typedef std::vector<FuncUnit *>::iterator fuListIterator; + + public: + + /** Constructs a FU pool. */ + FUPool(std::string name, std::vector<FUDesc *> l); + ~FUPool(); + + /** Annotates units that provide memory operations. Included only because + * old FU pool provided this function. + */ + void annotateMemoryUnits(unsigned hit_latency); + + /** + * Gets a FU providing the requested capability. Will mark the unit as busy, + * but leaves the freeing of the unit up to the IEW stage. + * @param capability The capability requested. + * @return Returns -2 if the FU pool does not have the capability, -1 if + * there is no free FU, and the FU's index otherwise. + */ + int getUnit(OpClass capability); + + /** Frees a FU at the end of this cycle. */ + void freeUnitNextCycle(int fu_idx); + + /** Frees all FUs on the list. */ + void processFreeUnits(); + + /** Returns the total number of FUs. */ + int size() { return numFU; } + + /** Debugging function used to dump FU information. */ + void dump(); + + /** Returns the operation execution latency of the given capability. */ + unsigned getOpLatency(OpClass capability) { + return maxOpLatencies[capability]; + } + + /** Returns the issue latency of the given capability. */ + unsigned getIssueLatency(OpClass capability) { + return maxIssueLatencies[capability]; + } + + /** Switches out functional unit pool. */ + void switchOut(); + + /** Takes over from another CPU's thread. */ + void takeOverFrom(); +}; + +#endif // __CPU_O3_FU_POOL_HH__ diff --git a/src/cpu/o3/iew.cc b/src/cpu/o3/iew.cc new file mode 100644 index 000000000..f99be7fe0 --- /dev/null +++ b/src/cpu/o3/iew.cc @@ -0,0 +1,35 @@ +/* + * Copyright (c) 2004-2005 The Regents of The University of Michigan + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are + * met: redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer; + * redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution; + * neither the name of the copyright holders nor the names of its + * contributors may be used to endorse or promote products derived from + * this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + * Authors: Kevin Lim + */ + +#include "cpu/o3/isa_specific.hh" +#include "cpu/o3/iew_impl.hh" +#include "cpu/o3/inst_queue.hh" + +template class DefaultIEW<O3CPUImpl>; diff --git a/src/cpu/o3/iew.hh b/src/cpu/o3/iew.hh new file mode 100644 index 000000000..a400c9fa8 --- /dev/null +++ b/src/cpu/o3/iew.hh @@ -0,0 +1,551 @@ +/* + * Copyright (c) 2004-2006 The Regents of The University of Michigan + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are + * met: redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer; + * redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution; + * neither the name of the copyright holders nor the names of its + * contributors may be used to endorse or promote products derived from + * this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + * Authors: Kevin Lim + */ + +#ifndef __CPU_O3_IEW_HH__ +#define __CPU_O3_IEW_HH__ + +#include "config/full_system.hh" + +#include <queue> + +#include "base/statistics.hh" +#include "base/timebuf.hh" +#include "cpu/o3/comm.hh" +#include "cpu/o3/scoreboard.hh" +#include "cpu/o3/lsq.hh" + +class FUPool; + +/** + * DefaultIEW handles both single threaded and SMT IEW + * (issue/execute/writeback). It handles the dispatching of + * instructions to the LSQ/IQ as part of the issue stage, and has the + * IQ try to issue instructions each cycle. The execute latency is + * actually tied into the issue latency to allow the IQ to be able to + * do back-to-back scheduling without having to speculatively schedule + * instructions. This happens by having the IQ have access to the + * functional units, and the IQ gets the execution latencies from the + * FUs when it issues instructions. Instructions reach the execute + * stage on the last cycle of their execution, which is when the IQ + * knows to wake up any dependent instructions, allowing back to back + * scheduling. The execute portion of IEW separates memory + * instructions from non-memory instructions, either telling the LSQ + * to execute the instruction, or executing the instruction directly. + * The writeback portion of IEW completes the instructions by waking + * up any dependents, and marking the register ready on the + * scoreboard. + */ +template<class Impl> +class DefaultIEW +{ + private: + //Typedefs from Impl + typedef typename Impl::CPUPol CPUPol; + typedef typename Impl::DynInstPtr DynInstPtr; + typedef typename Impl::O3CPU O3CPU; + typedef typename Impl::Params Params; + + typedef typename CPUPol::IQ IQ; + typedef typename CPUPol::RenameMap RenameMap; + typedef typename CPUPol::LSQ LSQ; + + typedef typename CPUPol::TimeStruct TimeStruct; + typedef typename CPUPol::IEWStruct IEWStruct; + typedef typename CPUPol::RenameStruct RenameStruct; + typedef typename CPUPol::IssueStruct IssueStruct; + + friend class Impl::O3CPU; + friend class CPUPol::IQ; + + public: + /** Overall IEW stage status. Used to determine if the CPU can + * deschedule itself due to a lack of activity. + */ + enum Status { + Active, + Inactive + }; + + /** Status for Issue, Execute, and Writeback stages. */ + enum StageStatus { + Running, + Blocked, + Idle, + StartSquash, + Squashing, + Unblocking + }; + + private: + /** Overall stage status. */ + Status _status; + /** Dispatch status. */ + StageStatus dispatchStatus[Impl::MaxThreads]; + /** Execute status. */ + StageStatus exeStatus; + /** Writeback status. */ + StageStatus wbStatus; + + public: + /** Constructs a DefaultIEW with the given parameters. */ + DefaultIEW(Params *params); + + /** Returns the name of the DefaultIEW stage. */ + std::string name() const; + + /** Registers statistics. */ + void regStats(); + + /** Initializes stage; sends back the number of free IQ and LSQ entries. */ + void initStage(); + + /** Returns the dcache port. */ + Port *getDcachePort() { return ldstQueue.getDcachePort(); } + + /** Sets CPU pointer for IEW, IQ, and LSQ. */ + void setCPU(O3CPU *cpu_ptr); + + /** Sets main time buffer used for backwards communication. */ + void setTimeBuffer(TimeBuffer<TimeStruct> *tb_ptr); + + /** Sets time buffer for getting instructions coming from rename. */ + void setRenameQueue(TimeBuffer<RenameStruct> *rq_ptr); + + /** Sets time buffer to pass on instructions to commit. */ + void setIEWQueue(TimeBuffer<IEWStruct> *iq_ptr); + + /** Sets pointer to list of active threads. */ + void setActiveThreads(std::list<unsigned> *at_ptr); + + /** Sets pointer to the scoreboard. */ + void setScoreboard(Scoreboard *sb_ptr); + + /** Drains IEW stage. */ + bool drain(); + + /** Resumes execution after a drain. */ + void resume(); + + /** Completes switch out of IEW stage. */ + void switchOut(); + + /** Takes over from another CPU's thread. */ + void takeOverFrom(); + + /** Returns if IEW is switched out. */ + bool isSwitchedOut() { return switchedOut; } + + /** Squashes instructions in IEW for a specific thread. */ + void squash(unsigned tid); + + /** Wakes all dependents of a completed instruction. */ + void wakeDependents(DynInstPtr &inst); + + /** Tells memory dependence unit that a memory instruction needs to be + * rescheduled. It will re-execute once replayMemInst() is called. + */ + void rescheduleMemInst(DynInstPtr &inst); + + /** Re-executes all rescheduled memory instructions. */ + void replayMemInst(DynInstPtr &inst); + + /** Sends an instruction to commit through the time buffer. */ + void instToCommit(DynInstPtr &inst); + + /** Inserts unused instructions of a thread into the skid buffer. */ + void skidInsert(unsigned tid); + + /** Returns the max of the number of entries in all of the skid buffers. */ + int skidCount(); + + /** Returns if all of the skid buffers are empty. */ + bool skidsEmpty(); + + /** Updates overall IEW status based on all of the stages' statuses. */ + void updateStatus(); + + /** Resets entries of the IQ and the LSQ. */ + void resetEntries(); + + /** Tells the CPU to wakeup if it has descheduled itself due to no + * activity. Used mainly by the LdWritebackEvent. + */ + void wakeCPU(); + + /** Reports to the CPU that there is activity this cycle. */ + void activityThisCycle(); + + /** Tells CPU that the IEW stage is active and running. */ + inline void activateStage(); + + /** Tells CPU that the IEW stage is inactive and idle. */ + inline void deactivateStage(); + + /** Returns if the LSQ has any stores to writeback. */ + bool hasStoresToWB() { return ldstQueue.hasStoresToWB(); } + + void incrWb(InstSeqNum &sn) + { + if (++wbOutstanding == wbMax) + ableToIssue = false; + DPRINTF(IEW, "wbOutstanding: %i\n", wbOutstanding); + assert(wbOutstanding <= wbMax); +#ifdef DEBUG + wbList.insert(sn); +#endif + } + + void decrWb(InstSeqNum &sn) + { + if (wbOutstanding-- == wbMax) + ableToIssue = true; + DPRINTF(IEW, "wbOutstanding: %i\n", wbOutstanding); + assert(wbOutstanding >= 0); +#ifdef DEBUG + assert(wbList.find(sn) != wbList.end()); + wbList.erase(sn); +#endif + } + +#ifdef DEBUG + std::set<InstSeqNum> wbList; + + void dumpWb() + { + std::set<InstSeqNum>::iterator wb_it = wbList.begin(); + while (wb_it != wbList.end()) { + cprintf("[sn:%lli]\n", + (*wb_it)); + wb_it++; + } + } +#endif + + bool canIssue() { return ableToIssue; } + + bool ableToIssue; + + private: + /** Sends commit proper information for a squash due to a branch + * mispredict. + */ + void squashDueToBranch(DynInstPtr &inst, unsigned thread_id); + + /** Sends commit proper information for a squash due to a memory order + * violation. + */ + void squashDueToMemOrder(DynInstPtr &inst, unsigned thread_id); + + /** Sends commit proper information for a squash due to memory becoming + * blocked (younger issued instructions must be retried). + */ + void squashDueToMemBlocked(DynInstPtr &inst, unsigned thread_id); + + /** Sets Dispatch to blocked, and signals back to other stages to block. */ + void block(unsigned thread_id); + + /** Unblocks Dispatch if the skid buffer is empty, and signals back to + * other stages to unblock. + */ + void unblock(unsigned thread_id); + + /** Determines proper actions to take given Dispatch's status. */ + void dispatch(unsigned tid); + + /** Dispatches instructions to IQ and LSQ. */ + void dispatchInsts(unsigned tid); + + /** Executes instructions. In the case of memory operations, it informs the + * LSQ to execute the instructions. Also handles any redirects that occur + * due to the executed instructions. + */ + void executeInsts(); + + /** Writebacks instructions. In our model, the instruction's execute() + * function atomically reads registers, executes, and writes registers. + * Thus this writeback only wakes up dependent instructions, and informs + * the scoreboard of registers becoming ready. + */ + void writebackInsts(); + + /** Returns the number of valid, non-squashed instructions coming from + * rename to dispatch. + */ + unsigned validInstsFromRename(); + + /** Reads the stall signals. */ + void readStallSignals(unsigned tid); + + /** Checks if any of the stall conditions are currently true. */ + bool checkStall(unsigned tid); + + /** Processes inputs and changes state accordingly. */ + void checkSignalsAndUpdate(unsigned tid); + + /** Removes instructions from rename from a thread's instruction list. */ + void emptyRenameInsts(unsigned tid); + + /** Sorts instructions coming from rename into lists separated by thread. */ + void sortInsts(); + + public: + /** Ticks IEW stage, causing Dispatch, the IQ, the LSQ, Execute, and + * Writeback to run for one cycle. + */ + void tick(); + + private: + /** Updates execution stats based on the instruction. */ + void updateExeInstStats(DynInstPtr &inst); + + /** Pointer to main time buffer used for backwards communication. */ + TimeBuffer<TimeStruct> *timeBuffer; + + /** Wire to write information heading to previous stages. */ + typename TimeBuffer<TimeStruct>::wire toFetch; + + /** Wire to get commit's output from backwards time buffer. */ + typename TimeBuffer<TimeStruct>::wire fromCommit; + + /** Wire to write information heading to previous stages. */ + typename TimeBuffer<TimeStruct>::wire toRename; + + /** Rename instruction queue interface. */ + TimeBuffer<RenameStruct> *renameQueue; + + /** Wire to get rename's output from rename queue. */ + typename TimeBuffer<RenameStruct>::wire fromRename; + + /** Issue stage queue. */ + TimeBuffer<IssueStruct> issueToExecQueue; + + /** Wire to read information from the issue stage time queue. */ + typename TimeBuffer<IssueStruct>::wire fromIssue; + + /** + * IEW stage time buffer. Holds ROB indices of instructions that + * can be marked as completed. + */ + TimeBuffer<IEWStruct> *iewQueue; + + /** Wire to write infromation heading to commit. */ + typename TimeBuffer<IEWStruct>::wire toCommit; + + /** Queue of all instructions coming from rename this cycle. */ + std::queue<DynInstPtr> insts[Impl::MaxThreads]; + + /** Skid buffer between rename and IEW. */ + std::queue<DynInstPtr> skidBuffer[Impl::MaxThreads]; + + /** Scoreboard pointer. */ + Scoreboard* scoreboard; + + public: + /** Instruction queue. */ + IQ instQueue; + + /** Load / store queue. */ + LSQ ldstQueue; + + /** Pointer to the functional unit pool. */ + FUPool *fuPool; + + private: + /** CPU pointer. */ + O3CPU *cpu; + + /** Records if IEW has written to the time buffer this cycle, so that the + * CPU can deschedule itself if there is no activity. + */ + bool wroteToTimeBuffer; + + /** Source of possible stalls. */ + struct Stalls { + bool commit; + }; + + /** Stages that are telling IEW to stall. */ + Stalls stalls[Impl::MaxThreads]; + + /** Debug function to print instructions that are issued this cycle. */ + void printAvailableInsts(); + + public: + /** Records if the LSQ needs to be updated on the next cycle, so that + * IEW knows if there will be activity on the next cycle. + */ + bool updateLSQNextCycle; + + private: + /** Records if there is a fetch redirect on this cycle for each thread. */ + bool fetchRedirect[Impl::MaxThreads]; + + /** Keeps track of the last valid branch delay slot instss for threads */ + InstSeqNum bdelayDoneSeqNum[Impl::MaxThreads]; + + /** Used to track if all instructions have been dispatched this cycle. + * If they have not, then blocking must have occurred, and the instructions + * would already be added to the skid buffer. + * @todo: Fix this hack. + */ + bool dispatchedAllInsts; + + /** Records if the queues have been changed (inserted or issued insts), + * so that IEW knows to broadcast the updated amount of free entries. + */ + bool updatedQueues; + + /** Commit to IEW delay, in ticks. */ + unsigned commitToIEWDelay; + + /** Rename to IEW delay, in ticks. */ + unsigned renameToIEWDelay; + + /** + * Issue to execute delay, in ticks. What this actually represents is + * the amount of time it takes for an instruction to wake up, be + * scheduled, and sent to a FU for execution. + */ + unsigned issueToExecuteDelay; + + /** Width of dispatch, in instructions. */ + unsigned dispatchWidth; + + /** Width of issue, in instructions. */ + unsigned issueWidth; + + /** Index into queue of instructions being written back. */ + unsigned wbNumInst; + + /** Cycle number within the queue of instructions being written back. + * Used in case there are too many instructions writing back at the current + * cycle and writesbacks need to be scheduled for the future. See comments + * in instToCommit(). + */ + unsigned wbCycle; + + /** Number of instructions in flight that will writeback. */ + + /** Number of instructions in flight that will writeback. */ + int wbOutstanding; + + /** Writeback width. */ + unsigned wbWidth; + + /** Writeback width * writeback depth, where writeback depth is + * the number of cycles of writing back instructions that can be + * buffered. */ + unsigned wbMax; + + /** Number of active threads. */ + unsigned numThreads; + + /** Pointer to list of active threads. */ + std::list<unsigned> *activeThreads; + + /** Maximum size of the skid buffer. */ + unsigned skidBufferMax; + + /** Is this stage switched out. */ + bool switchedOut; + + /** Stat for total number of idle cycles. */ + Stats::Scalar<> iewIdleCycles; + /** Stat for total number of squashing cycles. */ + Stats::Scalar<> iewSquashCycles; + /** Stat for total number of blocking cycles. */ + Stats::Scalar<> iewBlockCycles; + /** Stat for total number of unblocking cycles. */ + Stats::Scalar<> iewUnblockCycles; + /** Stat for total number of instructions dispatched. */ + Stats::Scalar<> iewDispatchedInsts; + /** Stat for total number of squashed instructions dispatch skips. */ + Stats::Scalar<> iewDispSquashedInsts; + /** Stat for total number of dispatched load instructions. */ + Stats::Scalar<> iewDispLoadInsts; + /** Stat for total number of dispatched store instructions. */ + Stats::Scalar<> iewDispStoreInsts; + /** Stat for total number of dispatched non speculative instructions. */ + Stats::Scalar<> iewDispNonSpecInsts; + /** Stat for number of times the IQ becomes full. */ + Stats::Scalar<> iewIQFullEvents; + /** Stat for number of times the LSQ becomes full. */ + Stats::Scalar<> iewLSQFullEvents; + /** Stat for total number of memory ordering violation events. */ + Stats::Scalar<> memOrderViolationEvents; + /** Stat for total number of incorrect predicted taken branches. */ + Stats::Scalar<> predictedTakenIncorrect; + /** Stat for total number of incorrect predicted not taken branches. */ + Stats::Scalar<> predictedNotTakenIncorrect; + /** Stat for total number of mispredicted branches detected at execute. */ + Stats::Formula branchMispredicts; + + /** Stat for total number of executed instructions. */ + Stats::Scalar<> iewExecutedInsts; + /** Stat for total number of executed load instructions. */ + Stats::Vector<> iewExecLoadInsts; + /** Stat for total number of executed store instructions. */ +// Stats::Scalar<> iewExecStoreInsts; + /** Stat for total number of squashed instructions skipped at execute. */ + Stats::Scalar<> iewExecSquashedInsts; + /** Number of executed software prefetches. */ + Stats::Vector<> iewExecutedSwp; + /** Number of executed nops. */ + Stats::Vector<> iewExecutedNop; + /** Number of executed meomory references. */ + Stats::Vector<> iewExecutedRefs; + /** Number of executed branches. */ + Stats::Vector<> iewExecutedBranches; + /** Number of executed store instructions. */ + Stats::Formula iewExecStoreInsts; + /** Number of instructions executed per cycle. */ + Stats::Formula iewExecRate; + + /** Number of instructions sent to commit. */ + Stats::Vector<> iewInstsToCommit; + /** Number of instructions that writeback. */ + Stats::Vector<> writebackCount; + /** Number of instructions that wake consumers. */ + Stats::Vector<> producerInst; + /** Number of instructions that wake up from producers. */ + Stats::Vector<> consumerInst; + /** Number of instructions that were delayed in writing back due + * to resource contention. + */ + Stats::Vector<> wbPenalized; + /** Number of instructions per cycle written back. */ + Stats::Formula wbRate; + /** Average number of woken instructions per writeback. */ + Stats::Formula wbFanout; + /** Number of instructions per cycle delayed in writing back . */ + Stats::Formula wbPenalizedRate; +}; + +#endif // __CPU_O3_IEW_HH__ diff --git a/src/cpu/o3/iew_impl.hh b/src/cpu/o3/iew_impl.hh new file mode 100644 index 000000000..c82f6dd21 --- /dev/null +++ b/src/cpu/o3/iew_impl.hh @@ -0,0 +1,1613 @@ +/* + * Copyright (c) 2004-2006 The Regents of The University of Michigan + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are + * met: redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer; + * redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution; + * neither the name of the copyright holders nor the names of its + * contributors may be used to endorse or promote products derived from + * this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + * Authors: Kevin Lim + */ + +// @todo: Fix the instantaneous communication among all the stages within +// iew. There's a clear delay between issue and execute, yet backwards +// communication happens simultaneously. + +#include <queue> + +#include "base/timebuf.hh" +#include "cpu/o3/fu_pool.hh" +#include "cpu/o3/iew.hh" + +template<class Impl> +DefaultIEW<Impl>::DefaultIEW(Params *params) + : issueToExecQueue(params->backComSize, params->forwardComSize), + instQueue(params), + ldstQueue(params), + fuPool(params->fuPool), + commitToIEWDelay(params->commitToIEWDelay), + renameToIEWDelay(params->renameToIEWDelay), + issueToExecuteDelay(params->issueToExecuteDelay), + dispatchWidth(params->dispatchWidth), + issueWidth(params->issueWidth), + wbOutstanding(0), + wbWidth(params->wbWidth), + numThreads(params->numberOfThreads), + switchedOut(false) +{ + _status = Active; + exeStatus = Running; + wbStatus = Idle; + + // Setup wire to read instructions coming from issue. + fromIssue = issueToExecQueue.getWire(-issueToExecuteDelay); + + // Instruction queue needs the queue between issue and execute. + instQueue.setIssueToExecuteQueue(&issueToExecQueue); + + instQueue.setIEW(this); + ldstQueue.setIEW(this); + + for (int i=0; i < numThreads; i++) { + dispatchStatus[i] = Running; + stalls[i].commit = false; + fetchRedirect[i] = false; + bdelayDoneSeqNum[i] = 0; + } + + wbMax = wbWidth * params->wbDepth; + + updateLSQNextCycle = false; + + ableToIssue = true; + + skidBufferMax = (3 * (renameToIEWDelay * params->renameWidth)) + issueWidth; +} + +template <class Impl> +std::string +DefaultIEW<Impl>::name() const +{ + return cpu->name() + ".iew"; +} + +template <class Impl> +void +DefaultIEW<Impl>::regStats() +{ + using namespace Stats; + + instQueue.regStats(); + ldstQueue.regStats(); + + iewIdleCycles + .name(name() + ".iewIdleCycles") + .desc("Number of cycles IEW is idle"); + + iewSquashCycles + .name(name() + ".iewSquashCycles") + .desc("Number of cycles IEW is squashing"); + + iewBlockCycles + .name(name() + ".iewBlockCycles") + .desc("Number of cycles IEW is blocking"); + + iewUnblockCycles + .name(name() + ".iewUnblockCycles") + .desc("Number of cycles IEW is unblocking"); + + iewDispatchedInsts + .name(name() + ".iewDispatchedInsts") + .desc("Number of instructions dispatched to IQ"); + + iewDispSquashedInsts + .name(name() + ".iewDispSquashedInsts") + .desc("Number of squashed instructions skipped by dispatch"); + + iewDispLoadInsts + .name(name() + ".iewDispLoadInsts") + .desc("Number of dispatched load instructions"); + + iewDispStoreInsts + .name(name() + ".iewDispStoreInsts") + .desc("Number of dispatched store instructions"); + + iewDispNonSpecInsts + .name(name() + ".iewDispNonSpecInsts") + .desc("Number of dispatched non-speculative instructions"); + + iewIQFullEvents + .name(name() + ".iewIQFullEvents") + .desc("Number of times the IQ has become full, causing a stall"); + + iewLSQFullEvents + .name(name() + ".iewLSQFullEvents") + .desc("Number of times the LSQ has become full, causing a stall"); + + memOrderViolationEvents + .name(name() + ".memOrderViolationEvents") + .desc("Number of memory order violations"); + + predictedTakenIncorrect + .name(name() + ".predictedTakenIncorrect") + .desc("Number of branches that were predicted taken incorrectly"); + + predictedNotTakenIncorrect + .name(name() + ".predictedNotTakenIncorrect") + .desc("Number of branches that were predicted not taken incorrectly"); + + branchMispredicts + .name(name() + ".branchMispredicts") + .desc("Number of branch mispredicts detected at execute"); + + branchMispredicts = predictedTakenIncorrect + predictedNotTakenIncorrect; + + iewExecutedInsts + .name(name() + ".iewExecutedInsts") + .desc("Number of executed instructions"); + + iewExecLoadInsts + .init(cpu->number_of_threads) + .name(name() + ".iewExecLoadInsts") + .desc("Number of load instructions executed") + .flags(total); + + iewExecSquashedInsts + .name(name() + ".iewExecSquashedInsts") + .desc("Number of squashed instructions skipped in execute"); + + iewExecutedSwp + .init(cpu->number_of_threads) + .name(name() + ".EXEC:swp") + .desc("number of swp insts executed") + .flags(total); + + iewExecutedNop + .init(cpu->number_of_threads) + .name(name() + ".EXEC:nop") + .desc("number of nop insts executed") + .flags(total); + + iewExecutedRefs + .init(cpu->number_of_threads) + .name(name() + ".EXEC:refs") + .desc("number of memory reference insts executed") + .flags(total); + + iewExecutedBranches + .init(cpu->number_of_threads) + .name(name() + ".EXEC:branches") + .desc("Number of branches executed") + .flags(total); + + iewExecStoreInsts + .name(name() + ".EXEC:stores") + .desc("Number of stores executed") + .flags(total); + iewExecStoreInsts = iewExecutedRefs - iewExecLoadInsts; + + iewExecRate + .name(name() + ".EXEC:rate") + .desc("Inst execution rate") + .flags(total); + + iewExecRate = iewExecutedInsts / cpu->numCycles; + + iewInstsToCommit + .init(cpu->number_of_threads) + .name(name() + ".WB:sent") + .desc("cumulative count of insts sent to commit") + .flags(total); + + writebackCount + .init(cpu->number_of_threads) + .name(name() + ".WB:count") + .desc("cumulative count of insts written-back") + .flags(total); + + producerInst + .init(cpu->number_of_threads) + .name(name() + ".WB:producers") + .desc("num instructions producing a value") + .flags(total); + + consumerInst + .init(cpu->number_of_threads) + .name(name() + ".WB:consumers") + .desc("num instructions consuming a value") + .flags(total); + + wbPenalized + .init(cpu->number_of_threads) + .name(name() + ".WB:penalized") + .desc("number of instrctions required to write to 'other' IQ") + .flags(total); + + wbPenalizedRate + .name(name() + ".WB:penalized_rate") + .desc ("fraction of instructions written-back that wrote to 'other' IQ") + .flags(total); + + wbPenalizedRate = wbPenalized / writebackCount; + + wbFanout + .name(name() + ".WB:fanout") + .desc("average fanout of values written-back") + .flags(total); + + wbFanout = producerInst / consumerInst; + + wbRate + .name(name() + ".WB:rate") + .desc("insts written-back per cycle") + .flags(total); + wbRate = writebackCount / cpu->numCycles; +} + +template<class Impl> +void +DefaultIEW<Impl>::initStage() +{ + for (int tid=0; tid < numThreads; tid++) { + toRename->iewInfo[tid].usedIQ = true; + toRename->iewInfo[tid].freeIQEntries = + instQueue.numFreeEntries(tid); + + toRename->iewInfo[tid].usedLSQ = true; + toRename->iewInfo[tid].freeLSQEntries = + ldstQueue.numFreeEntries(tid); + } +} + +template<class Impl> +void +DefaultIEW<Impl>::setCPU(O3CPU *cpu_ptr) +{ + DPRINTF(IEW, "Setting CPU pointer.\n"); + cpu = cpu_ptr; + + instQueue.setCPU(cpu_ptr); + ldstQueue.setCPU(cpu_ptr); + + cpu->activateStage(O3CPU::IEWIdx); +} + +template<class Impl> +void +DefaultIEW<Impl>::setTimeBuffer(TimeBuffer<TimeStruct> *tb_ptr) +{ + DPRINTF(IEW, "Setting time buffer pointer.\n"); + timeBuffer = tb_ptr; + + // Setup wire to read information from time buffer, from commit. + fromCommit = timeBuffer->getWire(-commitToIEWDelay); + + // Setup wire to write information back to previous stages. + toRename = timeBuffer->getWire(0); + + toFetch = timeBuffer->getWire(0); + + // Instruction queue also needs main time buffer. + instQueue.setTimeBuffer(tb_ptr); +} + +template<class Impl> +void +DefaultIEW<Impl>::setRenameQueue(TimeBuffer<RenameStruct> *rq_ptr) +{ + DPRINTF(IEW, "Setting rename queue pointer.\n"); + renameQueue = rq_ptr; + + // Setup wire to read information from rename queue. + fromRename = renameQueue->getWire(-renameToIEWDelay); +} + +template<class Impl> +void +DefaultIEW<Impl>::setIEWQueue(TimeBuffer<IEWStruct> *iq_ptr) +{ + DPRINTF(IEW, "Setting IEW queue pointer.\n"); + iewQueue = iq_ptr; + + // Setup wire to write instructions to commit. + toCommit = iewQueue->getWire(0); +} + +template<class Impl> +void +DefaultIEW<Impl>::setActiveThreads(std::list<unsigned> *at_ptr) +{ + DPRINTF(IEW, "Setting active threads list pointer.\n"); + activeThreads = at_ptr; + + ldstQueue.setActiveThreads(at_ptr); + instQueue.setActiveThreads(at_ptr); +} + +template<class Impl> +void +DefaultIEW<Impl>::setScoreboard(Scoreboard *sb_ptr) +{ + DPRINTF(IEW, "Setting scoreboard pointer.\n"); + scoreboard = sb_ptr; +} + +template <class Impl> +bool +DefaultIEW<Impl>::drain() +{ + // IEW is ready to drain at any time. + cpu->signalDrained(); + return true; +} + +template <class Impl> +void +DefaultIEW<Impl>::resume() +{ +} + +template <class Impl> +void +DefaultIEW<Impl>::switchOut() +{ + // Clear any state. + switchedOut = true; + assert(insts[0].empty()); + assert(skidBuffer[0].empty()); + + instQueue.switchOut(); + ldstQueue.switchOut(); + fuPool->switchOut(); + + for (int i = 0; i < numThreads; i++) { + while (!insts[i].empty()) + insts[i].pop(); + while (!skidBuffer[i].empty()) + skidBuffer[i].pop(); + } +} + +template <class Impl> +void +DefaultIEW<Impl>::takeOverFrom() +{ + // Reset all state. + _status = Active; + exeStatus = Running; + wbStatus = Idle; + switchedOut = false; + + instQueue.takeOverFrom(); + ldstQueue.takeOverFrom(); + fuPool->takeOverFrom(); + + initStage(); + cpu->activityThisCycle(); + + for (int i=0; i < numThreads; i++) { + dispatchStatus[i] = Running; + stalls[i].commit = false; + fetchRedirect[i] = false; + } + + updateLSQNextCycle = false; + + for (int i = 0; i < issueToExecQueue.getSize(); ++i) { + issueToExecQueue.advance(); + } +} + +template<class Impl> +void +DefaultIEW<Impl>::squash(unsigned tid) +{ + DPRINTF(IEW, "[tid:%i]: Squashing all instructions.\n", + tid); + + // Tell the IQ to start squashing. + instQueue.squash(tid); + + // Tell the LDSTQ to start squashing. +#if ISA_HAS_DELAY_SLOT + ldstQueue.squash(fromCommit->commitInfo[tid].bdelayDoneSeqNum, tid); +#else + ldstQueue.squash(fromCommit->commitInfo[tid].doneSeqNum, tid); +#endif + updatedQueues = true; + + // Clear the skid buffer in case it has any data in it. + DPRINTF(IEW, "[tid:%i]: Removing skidbuffer instructions until [sn:%i].\n", + tid, fromCommit->commitInfo[tid].bdelayDoneSeqNum); + + while (!skidBuffer[tid].empty()) { +#if ISA_HAS_DELAY_SLOT + if (skidBuffer[tid].front()->seqNum <= + fromCommit->commitInfo[tid].bdelayDoneSeqNum) { + DPRINTF(IEW, "[tid:%i]: Cannot remove skidbuffer instructions " + "that occur before delay slot [sn:%i].\n", + fromCommit->commitInfo[tid].bdelayDoneSeqNum, + tid); + break; + } else { + DPRINTF(IEW, "[tid:%i]: Removing instruction [sn:%i] from " + "skidBuffer.\n", tid, skidBuffer[tid].front()->seqNum); + } +#endif + if (skidBuffer[tid].front()->isLoad() || + skidBuffer[tid].front()->isStore() ) { + toRename->iewInfo[tid].dispatchedToLSQ++; + } + + toRename->iewInfo[tid].dispatched++; + + skidBuffer[tid].pop(); + } + + bdelayDoneSeqNum[tid] = fromCommit->commitInfo[tid].bdelayDoneSeqNum; + + emptyRenameInsts(tid); +} + +template<class Impl> +void +DefaultIEW<Impl>::squashDueToBranch(DynInstPtr &inst, unsigned tid) +{ + DPRINTF(IEW, "[tid:%i]: Squashing from a specific instruction, PC: %#x " + "[sn:%i].\n", tid, inst->readPC(), inst->seqNum); + + toCommit->squash[tid] = true; + toCommit->squashedSeqNum[tid] = inst->seqNum; + toCommit->mispredPC[tid] = inst->readPC(); + toCommit->branchMispredict[tid] = true; + +#if ISA_HAS_DELAY_SLOT + bool branch_taken = inst->readNextNPC() != + (inst->readNextPC() + sizeof(TheISA::MachInst)); + + toCommit->branchTaken[tid] = branch_taken; + + toCommit->condDelaySlotBranch[tid] = inst->isCondDelaySlot(); + + if (inst->isCondDelaySlot() && branch_taken) { + toCommit->nextPC[tid] = inst->readNextPC(); + } else { + toCommit->nextPC[tid] = inst->readNextNPC(); + } +#else + toCommit->branchTaken[tid] = inst->readNextPC() != + (inst->readPC() + sizeof(TheISA::MachInst)); + toCommit->nextPC[tid] = inst->readNextPC(); +#endif + + toCommit->includeSquashInst[tid] = false; + + wroteToTimeBuffer = true; +} + +template<class Impl> +void +DefaultIEW<Impl>::squashDueToMemOrder(DynInstPtr &inst, unsigned tid) +{ + DPRINTF(IEW, "[tid:%i]: Squashing from a specific instruction, " + "PC: %#x [sn:%i].\n", tid, inst->readPC(), inst->seqNum); + + toCommit->squash[tid] = true; + toCommit->squashedSeqNum[tid] = inst->seqNum; + toCommit->nextPC[tid] = inst->readNextPC(); + + toCommit->includeSquashInst[tid] = false; + + wroteToTimeBuffer = true; +} + +template<class Impl> +void +DefaultIEW<Impl>::squashDueToMemBlocked(DynInstPtr &inst, unsigned tid) +{ + DPRINTF(IEW, "[tid:%i]: Memory blocked, squashing load and younger insts, " + "PC: %#x [sn:%i].\n", tid, inst->readPC(), inst->seqNum); + + toCommit->squash[tid] = true; + toCommit->squashedSeqNum[tid] = inst->seqNum; + toCommit->nextPC[tid] = inst->readPC(); + + // Must include the broadcasted SN in the squash. + toCommit->includeSquashInst[tid] = true; + + ldstQueue.setLoadBlockedHandled(tid); + + wroteToTimeBuffer = true; +} + +template<class Impl> +void +DefaultIEW<Impl>::block(unsigned tid) +{ + DPRINTF(IEW, "[tid:%u]: Blocking.\n", tid); + + if (dispatchStatus[tid] != Blocked && + dispatchStatus[tid] != Unblocking) { + toRename->iewBlock[tid] = true; + wroteToTimeBuffer = true; + } + + // Add the current inputs to the skid buffer so they can be + // reprocessed when this stage unblocks. + skidInsert(tid); + + dispatchStatus[tid] = Blocked; +} + +template<class Impl> +void +DefaultIEW<Impl>::unblock(unsigned tid) +{ + DPRINTF(IEW, "[tid:%i]: Reading instructions out of the skid " + "buffer %u.\n",tid, tid); + + // If the skid bufffer is empty, signal back to previous stages to unblock. + // Also switch status to running. + if (skidBuffer[tid].empty()) { + toRename->iewUnblock[tid] = true; + wroteToTimeBuffer = true; + DPRINTF(IEW, "[tid:%i]: Done unblocking.\n",tid); + dispatchStatus[tid] = Running; + } +} + +template<class Impl> +void +DefaultIEW<Impl>::wakeDependents(DynInstPtr &inst) +{ + instQueue.wakeDependents(inst); +} + +template<class Impl> +void +DefaultIEW<Impl>::rescheduleMemInst(DynInstPtr &inst) +{ + instQueue.rescheduleMemInst(inst); +} + +template<class Impl> +void +DefaultIEW<Impl>::replayMemInst(DynInstPtr &inst) +{ + instQueue.replayMemInst(inst); +} + +template<class Impl> +void +DefaultIEW<Impl>::instToCommit(DynInstPtr &inst) +{ + // First check the time slot that this instruction will write + // to. If there are free write ports at the time, then go ahead + // and write the instruction to that time. If there are not, + // keep looking back to see where's the first time there's a + // free slot. + while ((*iewQueue)[wbCycle].insts[wbNumInst]) { + ++wbNumInst; + if (wbNumInst == wbWidth) { + ++wbCycle; + wbNumInst = 0; + } + + assert((wbCycle * wbWidth + wbNumInst) <= wbMax); + } + + DPRINTF(IEW, "Current wb cycle: %i, width: %i, numInst: %i\nwbActual:%i\n", + wbCycle, wbWidth, wbNumInst, wbCycle * wbWidth + wbNumInst); + // Add finished instruction to queue to commit. + (*iewQueue)[wbCycle].insts[wbNumInst] = inst; + (*iewQueue)[wbCycle].size++; +} + +template <class Impl> +unsigned +DefaultIEW<Impl>::validInstsFromRename() +{ + unsigned inst_count = 0; + + for (int i=0; i<fromRename->size; i++) { + if (!fromRename->insts[i]->isSquashed()) + inst_count++; + } + + return inst_count; +} + +template<class Impl> +void +DefaultIEW<Impl>::skidInsert(unsigned tid) +{ + DynInstPtr inst = NULL; + + while (!insts[tid].empty()) { + inst = insts[tid].front(); + + insts[tid].pop(); + + DPRINTF(Decode,"[tid:%i]: Inserting [sn:%lli] PC:%#x into " + "dispatch skidBuffer %i\n",tid, inst->seqNum, + inst->readPC(),tid); + + skidBuffer[tid].push(inst); + } + + assert(skidBuffer[tid].size() <= skidBufferMax && + "Skidbuffer Exceeded Max Size"); +} + +template<class Impl> +int +DefaultIEW<Impl>::skidCount() +{ + int max=0; + + std::list<unsigned>::iterator threads = (*activeThreads).begin(); + + while (threads != (*activeThreads).end()) { + unsigned thread_count = skidBuffer[*threads++].size(); + if (max < thread_count) + max = thread_count; + } + + return max; +} + +template<class Impl> +bool +DefaultIEW<Impl>::skidsEmpty() +{ + std::list<unsigned>::iterator threads = (*activeThreads).begin(); + + while (threads != (*activeThreads).end()) { + if (!skidBuffer[*threads++].empty()) + return false; + } + + return true; +} + +template <class Impl> +void +DefaultIEW<Impl>::updateStatus() +{ + bool any_unblocking = false; + + std::list<unsigned>::iterator threads = (*activeThreads).begin(); + + threads = (*activeThreads).begin(); + + while (threads != (*activeThreads).end()) { + unsigned tid = *threads++; + + if (dispatchStatus[tid] == Unblocking) { + any_unblocking = true; + break; + } + } + + // If there are no ready instructions waiting to be scheduled by the IQ, + // and there's no stores waiting to write back, and dispatch is not + // unblocking, then there is no internal activity for the IEW stage. + if (_status == Active && !instQueue.hasReadyInsts() && + !ldstQueue.willWB() && !any_unblocking) { + DPRINTF(IEW, "IEW switching to idle\n"); + + deactivateStage(); + + _status = Inactive; + } else if (_status == Inactive && (instQueue.hasReadyInsts() || + ldstQueue.willWB() || + any_unblocking)) { + // Otherwise there is internal activity. Set to active. + DPRINTF(IEW, "IEW switching to active\n"); + + activateStage(); + + _status = Active; + } +} + +template <class Impl> +void +DefaultIEW<Impl>::resetEntries() +{ + instQueue.resetEntries(); + ldstQueue.resetEntries(); +} + +template <class Impl> +void +DefaultIEW<Impl>::readStallSignals(unsigned tid) +{ + if (fromCommit->commitBlock[tid]) { + stalls[tid].commit = true; + } + + if (fromCommit->commitUnblock[tid]) { + assert(stalls[tid].commit); + stalls[tid].commit = false; + } +} + +template <class Impl> +bool +DefaultIEW<Impl>::checkStall(unsigned tid) +{ + bool ret_val(false); + + if (stalls[tid].commit) { + DPRINTF(IEW,"[tid:%i]: Stall from Commit stage detected.\n",tid); + ret_val = true; + } else if (instQueue.isFull(tid)) { + DPRINTF(IEW,"[tid:%i]: Stall: IQ is full.\n",tid); + ret_val = true; + } else if (ldstQueue.isFull(tid)) { + DPRINTF(IEW,"[tid:%i]: Stall: LSQ is full\n",tid); + + if (ldstQueue.numLoads(tid) > 0 ) { + + DPRINTF(IEW,"[tid:%i]: LSQ oldest load: [sn:%i] \n", + tid,ldstQueue.getLoadHeadSeqNum(tid)); + } + + if (ldstQueue.numStores(tid) > 0) { + + DPRINTF(IEW,"[tid:%i]: LSQ oldest store: [sn:%i] \n", + tid,ldstQueue.getStoreHeadSeqNum(tid)); + } + + ret_val = true; + } else if (ldstQueue.isStalled(tid)) { + DPRINTF(IEW,"[tid:%i]: Stall: LSQ stall detected.\n",tid); + ret_val = true; + } + + return ret_val; +} + +template <class Impl> +void +DefaultIEW<Impl>::checkSignalsAndUpdate(unsigned tid) +{ + // Check if there's a squash signal, squash if there is + // Check stall signals, block if there is. + // If status was Blocked + // if so then go to unblocking + // If status was Squashing + // check if squashing is not high. Switch to running this cycle. + + readStallSignals(tid); + + if (fromCommit->commitInfo[tid].squash) { + squash(tid); + + if (dispatchStatus[tid] == Blocked || + dispatchStatus[tid] == Unblocking) { + toRename->iewUnblock[tid] = true; + wroteToTimeBuffer = true; + } + + dispatchStatus[tid] = Squashing; + + fetchRedirect[tid] = false; + return; + } + + if (fromCommit->commitInfo[tid].robSquashing) { + DPRINTF(IEW, "[tid:%i]: ROB is still squashing.\n", tid); + + dispatchStatus[tid] = Squashing; + + emptyRenameInsts(tid); + wroteToTimeBuffer = true; + return; + } + + if (checkStall(tid)) { + block(tid); + dispatchStatus[tid] = Blocked; + return; + } + + if (dispatchStatus[tid] == Blocked) { + // Status from previous cycle was blocked, but there are no more stall + // conditions. Switch over to unblocking. + DPRINTF(IEW, "[tid:%i]: Done blocking, switching to unblocking.\n", + tid); + + dispatchStatus[tid] = Unblocking; + + unblock(tid); + + return; + } + + if (dispatchStatus[tid] == Squashing) { + // Switch status to running if rename isn't being told to block or + // squash this cycle. + DPRINTF(IEW, "[tid:%i]: Done squashing, switching to running.\n", + tid); + + dispatchStatus[tid] = Running; + + return; + } +} + +template <class Impl> +void +DefaultIEW<Impl>::sortInsts() +{ + int insts_from_rename = fromRename->size; +#ifdef DEBUG +#if !ISA_HAS_DELAY_SLOT + for (int i = 0; i < numThreads; i++) + assert(insts[i].empty()); +#endif +#endif + for (int i = 0; i < insts_from_rename; ++i) { + insts[fromRename->insts[i]->threadNumber].push(fromRename->insts[i]); + } +} + +template <class Impl> +void +DefaultIEW<Impl>::emptyRenameInsts(unsigned tid) +{ + DPRINTF(IEW, "[tid:%i]: Removing incoming rename instructions until " + "[sn:%i].\n", tid, bdelayDoneSeqNum[tid]); + + while (!insts[tid].empty()) { +#if ISA_HAS_DELAY_SLOT + if (insts[tid].front()->seqNum <= bdelayDoneSeqNum[tid]) { + DPRINTF(IEW, "[tid:%i]: Done removing, cannot remove instruction" + " that occurs at or before delay slot [sn:%i].\n", + tid, bdelayDoneSeqNum[tid]); + break; + } else { + DPRINTF(IEW, "[tid:%i]: Removing incoming rename instruction " + "[sn:%i].\n", tid, insts[tid].front()->seqNum); + } +#endif + + if (insts[tid].front()->isLoad() || + insts[tid].front()->isStore() ) { + toRename->iewInfo[tid].dispatchedToLSQ++; + } + + toRename->iewInfo[tid].dispatched++; + + insts[tid].pop(); + } +} + +template <class Impl> +void +DefaultIEW<Impl>::emptyRenameInsts(unsigned tid) +{ + while (!insts[tid].empty()) { + if (insts[tid].front()->isLoad() || + insts[tid].front()->isStore() ) { + toRename->iewInfo[tid].dispatchedToLSQ++; + } + + toRename->iewInfo[tid].dispatched++; + + insts[tid].pop(); + } +} + +template <class Impl> +void +DefaultIEW<Impl>::wakeCPU() +{ + cpu->wakeCPU(); +} + +template <class Impl> +void +DefaultIEW<Impl>::activityThisCycle() +{ + DPRINTF(Activity, "Activity this cycle.\n"); + cpu->activityThisCycle(); +} + +template <class Impl> +inline void +DefaultIEW<Impl>::activateStage() +{ + DPRINTF(Activity, "Activating stage.\n"); + cpu->activateStage(O3CPU::IEWIdx); +} + +template <class Impl> +inline void +DefaultIEW<Impl>::deactivateStage() +{ + DPRINTF(Activity, "Deactivating stage.\n"); + cpu->deactivateStage(O3CPU::IEWIdx); +} + +template<class Impl> +void +DefaultIEW<Impl>::dispatch(unsigned tid) +{ + // If status is Running or idle, + // call dispatchInsts() + // If status is Unblocking, + // buffer any instructions coming from rename + // continue trying to empty skid buffer + // check if stall conditions have passed + + if (dispatchStatus[tid] == Blocked) { + ++iewBlockCycles; + + } else if (dispatchStatus[tid] == Squashing) { + ++iewSquashCycles; + } + + // Dispatch should try to dispatch as many instructions as its bandwidth + // will allow, as long as it is not currently blocked. + if (dispatchStatus[tid] == Running || + dispatchStatus[tid] == Idle) { + DPRINTF(IEW, "[tid:%i] Not blocked, so attempting to run " + "dispatch.\n", tid); + + dispatchInsts(tid); + } else if (dispatchStatus[tid] == Unblocking) { + // Make sure that the skid buffer has something in it if the + // status is unblocking. + assert(!skidsEmpty()); + + // If the status was unblocking, then instructions from the skid + // buffer were used. Remove those instructions and handle + // the rest of unblocking. + dispatchInsts(tid); + + ++iewUnblockCycles; + + if (validInstsFromRename() && dispatchedAllInsts) { + // Add the current inputs to the skid buffer so they can be + // reprocessed when this stage unblocks. + skidInsert(tid); + } + + unblock(tid); + } +} + +template <class Impl> +void +DefaultIEW<Impl>::dispatchInsts(unsigned tid) +{ + dispatchedAllInsts = true; + + // Obtain instructions from skid buffer if unblocking, or queue from rename + // otherwise. + std::queue<DynInstPtr> &insts_to_dispatch = + dispatchStatus[tid] == Unblocking ? + skidBuffer[tid] : insts[tid]; + + int insts_to_add = insts_to_dispatch.size(); + + DynInstPtr inst; + bool add_to_iq = false; + int dis_num_inst = 0; + + // Loop through the instructions, putting them in the instruction + // queue. + for ( ; dis_num_inst < insts_to_add && + dis_num_inst < dispatchWidth; + ++dis_num_inst) + { + inst = insts_to_dispatch.front(); + + if (dispatchStatus[tid] == Unblocking) { + DPRINTF(IEW, "[tid:%i]: Issue: Examining instruction from skid " + "buffer\n", tid); + } + + // Make sure there's a valid instruction there. + assert(inst); + + DPRINTF(IEW, "[tid:%i]: Issue: Adding PC %#x [sn:%lli] [tid:%i] to " + "IQ.\n", + tid, inst->readPC(), inst->seqNum, inst->threadNumber); + + // Be sure to mark these instructions as ready so that the + // commit stage can go ahead and execute them, and mark + // them as issued so the IQ doesn't reprocess them. + + // Check for squashed instructions. + if (inst->isSquashed()) { + DPRINTF(IEW, "[tid:%i]: Issue: Squashed instruction encountered, " + "not adding to IQ.\n", tid); + + ++iewDispSquashedInsts; + + insts_to_dispatch.pop(); + + //Tell Rename That An Instruction has been processed + if (inst->isLoad() || inst->isStore()) { + toRename->iewInfo[tid].dispatchedToLSQ++; + } + toRename->iewInfo[tid].dispatched++; + + continue; + } + + // Check for full conditions. + if (instQueue.isFull(tid)) { + DPRINTF(IEW, "[tid:%i]: Issue: IQ has become full.\n", tid); + + // Call function to start blocking. + block(tid); + + // Set unblock to false. Special case where we are using + // skidbuffer (unblocking) instructions but then we still + // get full in the IQ. + toRename->iewUnblock[tid] = false; + + dispatchedAllInsts = false; + + ++iewIQFullEvents; + break; + } else if (ldstQueue.isFull(tid)) { + DPRINTF(IEW, "[tid:%i]: Issue: LSQ has become full.\n",tid); + + // Call function to start blocking. + block(tid); + + // Set unblock to false. Special case where we are using + // skidbuffer (unblocking) instructions but then we still + // get full in the IQ. + toRename->iewUnblock[tid] = false; + + dispatchedAllInsts = false; + + ++iewLSQFullEvents; + break; + } + + // Otherwise issue the instruction just fine. + if (inst->isLoad()) { + DPRINTF(IEW, "[tid:%i]: Issue: Memory instruction " + "encountered, adding to LSQ.\n", tid); + + // Reserve a spot in the load store queue for this + // memory access. + ldstQueue.insertLoad(inst); + + ++iewDispLoadInsts; + + add_to_iq = true; + + toRename->iewInfo[tid].dispatchedToLSQ++; + } else if (inst->isStore()) { + DPRINTF(IEW, "[tid:%i]: Issue: Memory instruction " + "encountered, adding to LSQ.\n", tid); + + ldstQueue.insertStore(inst); + + ++iewDispStoreInsts; + + if (inst->isStoreConditional()) { + // Store conditionals need to be set as "canCommit()" + // so that commit can process them when they reach the + // head of commit. + // @todo: This is somewhat specific to Alpha. + inst->setCanCommit(); + instQueue.insertNonSpec(inst); + add_to_iq = false; + + ++iewDispNonSpecInsts; + } else { + add_to_iq = true; + } + + toRename->iewInfo[tid].dispatchedToLSQ++; +#if FULL_SYSTEM + } else if (inst->isMemBarrier() || inst->isWriteBarrier()) { + // Same as non-speculative stores. + inst->setCanCommit(); + instQueue.insertBarrier(inst); + add_to_iq = false; +#endif + } else if (inst->isNonSpeculative()) { + DPRINTF(IEW, "[tid:%i]: Issue: Nonspeculative instruction " + "encountered, skipping.\n", tid); + + // Same as non-speculative stores. + inst->setCanCommit(); + + // Specifically insert it as nonspeculative. + instQueue.insertNonSpec(inst); + + ++iewDispNonSpecInsts; + + add_to_iq = false; + } else if (inst->isNop()) { + DPRINTF(IEW, "[tid:%i]: Issue: Nop instruction encountered, " + "skipping.\n", tid); + + inst->setIssued(); + inst->setExecuted(); + inst->setCanCommit(); + + instQueue.recordProducer(inst); + + iewExecutedNop[tid]++; + + add_to_iq = false; + } else if (inst->isExecuted()) { + assert(0 && "Instruction shouldn't be executed.\n"); + DPRINTF(IEW, "Issue: Executed branch encountered, " + "skipping.\n"); + + inst->setIssued(); + inst->setCanCommit(); + + instQueue.recordProducer(inst); + + add_to_iq = false; + } else { + add_to_iq = true; + } + + // If the instruction queue is not full, then add the + // instruction. + if (add_to_iq) { + instQueue.insert(inst); + } + + insts_to_dispatch.pop(); + + toRename->iewInfo[tid].dispatched++; + + ++iewDispatchedInsts; + } + + if (!insts_to_dispatch.empty()) { + DPRINTF(IEW,"[tid:%i]: Issue: Bandwidth Full. Blocking.\n", tid); + block(tid); + toRename->iewUnblock[tid] = false; + } + + if (dispatchStatus[tid] == Idle && dis_num_inst) { + dispatchStatus[tid] = Running; + + updatedQueues = true; + } + + dis_num_inst = 0; +} + +template <class Impl> +void +DefaultIEW<Impl>::printAvailableInsts() +{ + int inst = 0; + + std::cout << "Available Instructions: "; + + while (fromIssue->insts[inst]) { + + if (inst%3==0) std::cout << "\n\t"; + + std::cout << "PC: " << fromIssue->insts[inst]->readPC() + << " TN: " << fromIssue->insts[inst]->threadNumber + << " SN: " << fromIssue->insts[inst]->seqNum << " | "; + + inst++; + + } + + std::cout << "\n"; +} + +template <class Impl> +void +DefaultIEW<Impl>::executeInsts() +{ + wbNumInst = 0; + wbCycle = 0; + + std::list<unsigned>::iterator threads = (*activeThreads).begin(); + + while (threads != (*activeThreads).end()) { + unsigned tid = *threads++; + fetchRedirect[tid] = false; + } + + // Uncomment this if you want to see all available instructions. +// printAvailableInsts(); + + // Execute/writeback any instructions that are available. + int insts_to_execute = fromIssue->size; + int inst_num = 0; + for (; inst_num < insts_to_execute; + ++inst_num) { + + DPRINTF(IEW, "Execute: Executing instructions from IQ.\n"); + + DynInstPtr inst = instQueue.getInstToExecute(); + + DPRINTF(IEW, "Execute: Processing PC %#x, [tid:%i] [sn:%i].\n", + inst->readPC(), inst->threadNumber,inst->seqNum); + + // Check if the instruction is squashed; if so then skip it + if (inst->isSquashed()) { + DPRINTF(IEW, "Execute: Instruction was squashed.\n"); + + // Consider this instruction executed so that commit can go + // ahead and retire the instruction. + inst->setExecuted(); + + // Not sure if I should set this here or just let commit try to + // commit any squashed instructions. I like the latter a bit more. + inst->setCanCommit(); + + ++iewExecSquashedInsts; + + decrWb(inst->seqNum); + continue; + } + + Fault fault = NoFault; + + // Execute instruction. + // Note that if the instruction faults, it will be handled + // at the commit stage. + if (inst->isMemRef() && + (!inst->isDataPrefetch() && !inst->isInstPrefetch())) { + DPRINTF(IEW, "Execute: Calculating address for memory " + "reference.\n"); + + // Tell the LDSTQ to execute this instruction (if it is a load). + if (inst->isLoad()) { + // Loads will mark themselves as executed, and their writeback + // event adds the instruction to the queue to commit + fault = ldstQueue.executeLoad(inst); + } else if (inst->isStore()) { + fault = ldstQueue.executeStore(inst); + + // If the store had a fault then it may not have a mem req + if (!inst->isStoreConditional() && fault == NoFault) { + inst->setExecuted(); + + instToCommit(inst); + } else if (fault != NoFault) { + // If the instruction faulted, then we need to send it along to commit + // without the instruction completing. + + // Send this instruction to commit, also make sure iew stage + // realizes there is activity. + inst->setExecuted(); + + instToCommit(inst); + activityThisCycle(); + } + + // Store conditionals will mark themselves as + // executed, and their writeback event will add the + // instruction to the queue to commit. + } else { + panic("Unexpected memory type!\n"); + } + + } else { + inst->execute(); + + inst->setExecuted(); + + instToCommit(inst); + } + + updateExeInstStats(inst); + + // Check if branch prediction was correct, if not then we need + // to tell commit to squash in flight instructions. Only + // handle this if there hasn't already been something that + // redirects fetch in this group of instructions. + + // This probably needs to prioritize the redirects if a different + // scheduler is used. Currently the scheduler schedules the oldest + // instruction first, so the branch resolution order will be correct. + unsigned tid = inst->threadNumber; + + if (!fetchRedirect[tid]) { + + if (inst->mispredicted()) { + fetchRedirect[tid] = true; + + DPRINTF(IEW, "Execute: Branch mispredict detected.\n"); +#if ISA_HAS_DELAY_SLOT + DPRINTF(IEW, "Execute: Redirecting fetch to PC: %#x.\n", + inst->nextNPC); +#else + DPRINTF(IEW, "Execute: Redirecting fetch to PC: %#x.\n", + inst->nextPC); +#endif + // If incorrect, then signal the ROB that it must be squashed. + squashDueToBranch(inst, tid); + + if (inst->predTaken()) { + predictedTakenIncorrect++; + } else { + predictedNotTakenIncorrect++; + } + } else if (ldstQueue.violation(tid)) { + fetchRedirect[tid] = true; + + // If there was an ordering violation, then get the + // DynInst that caused the violation. Note that this + // clears the violation signal. + DynInstPtr violator; + violator = ldstQueue.getMemDepViolator(tid); + + DPRINTF(IEW, "LDSTQ detected a violation. Violator PC: " + "%#x, inst PC: %#x. Addr is: %#x.\n", + violator->readPC(), inst->readPC(), inst->physEffAddr); + + // Tell the instruction queue that a violation has occured. + instQueue.violation(inst, violator); + + // Squash. + squashDueToMemOrder(inst,tid); + + ++memOrderViolationEvents; + } else if (ldstQueue.loadBlocked(tid) && + !ldstQueue.isLoadBlockedHandled(tid)) { + fetchRedirect[tid] = true; + + DPRINTF(IEW, "Load operation couldn't execute because the " + "memory system is blocked. PC: %#x [sn:%lli]\n", + inst->readPC(), inst->seqNum); + + squashDueToMemBlocked(inst, tid); + } + } + } + + // Update and record activity if we processed any instructions. + if (inst_num) { + if (exeStatus == Idle) { + exeStatus = Running; + } + + updatedQueues = true; + + cpu->activityThisCycle(); + } + + // Need to reset this in case a writeback event needs to write into the + // iew queue. That way the writeback event will write into the correct + // spot in the queue. + wbNumInst = 0; +} + +template <class Impl> +void +DefaultIEW<Impl>::writebackInsts() +{ + // Loop through the head of the time buffer and wake any + // dependents. These instructions are about to write back. Also + // mark scoreboard that this instruction is finally complete. + // Either have IEW have direct access to scoreboard, or have this + // as part of backwards communication. + for (int inst_num = 0; inst_num < issueWidth && + toCommit->insts[inst_num]; inst_num++) { + DynInstPtr inst = toCommit->insts[inst_num]; + int tid = inst->threadNumber; + + DPRINTF(IEW, "Sending instructions to commit, [sn:%lli] PC %#x.\n", + inst->seqNum, inst->readPC()); + + iewInstsToCommit[tid]++; + + // Some instructions will be sent to commit without having + // executed because they need commit to handle them. + // E.g. Uncached loads have not actually executed when they + // are first sent to commit. Instead commit must tell the LSQ + // when it's ready to execute the uncached load. + if (!inst->isSquashed() && inst->isExecuted() && inst->getFault() == NoFault) { + int dependents = instQueue.wakeDependents(inst); + + for (int i = 0; i < inst->numDestRegs(); i++) { + //mark as Ready + DPRINTF(IEW,"Setting Destination Register %i\n", + inst->renamedDestRegIdx(i)); + scoreboard->setReg(inst->renamedDestRegIdx(i)); + } + + if (dependents) { + producerInst[tid]++; + consumerInst[tid]+= dependents; + } + writebackCount[tid]++; + } + + decrWb(inst->seqNum); + } +} + +template<class Impl> +void +DefaultIEW<Impl>::tick() +{ + wbNumInst = 0; + wbCycle = 0; + + wroteToTimeBuffer = false; + updatedQueues = false; + + sortInsts(); + + // Free function units marked as being freed this cycle. + fuPool->processFreeUnits(); + + std::list<unsigned>::iterator threads = (*activeThreads).begin(); + + // Check stall and squash signals, dispatch any instructions. + while (threads != (*activeThreads).end()) { + unsigned tid = *threads++; + + DPRINTF(IEW,"Issue: Processing [tid:%i]\n",tid); + + checkSignalsAndUpdate(tid); + dispatch(tid); + } + + if (exeStatus != Squashing) { + executeInsts(); + + writebackInsts(); + + // Have the instruction queue try to schedule any ready instructions. + // (In actuality, this scheduling is for instructions that will + // be executed next cycle.) + instQueue.scheduleReadyInsts(); + + // Also should advance its own time buffers if the stage ran. + // Not the best place for it, but this works (hopefully). + issueToExecQueue.advance(); + } + + bool broadcast_free_entries = false; + + if (updatedQueues || exeStatus == Running || updateLSQNextCycle) { + exeStatus = Idle; + updateLSQNextCycle = false; + + broadcast_free_entries = true; + } + + // Writeback any stores using any leftover bandwidth. + ldstQueue.writebackStores(); + + // Check the committed load/store signals to see if there's a load + // or store to commit. Also check if it's being told to execute a + // nonspeculative instruction. + // This is pretty inefficient... + + threads = (*activeThreads).begin(); + while (threads != (*activeThreads).end()) { + unsigned tid = (*threads++); + + DPRINTF(IEW,"Processing [tid:%i]\n",tid); + + // Update structures based on instructions committed. + if (fromCommit->commitInfo[tid].doneSeqNum != 0 && + !fromCommit->commitInfo[tid].squash && + !fromCommit->commitInfo[tid].robSquashing) { + + ldstQueue.commitStores(fromCommit->commitInfo[tid].doneSeqNum,tid); + + ldstQueue.commitLoads(fromCommit->commitInfo[tid].doneSeqNum,tid); + + updateLSQNextCycle = true; + instQueue.commit(fromCommit->commitInfo[tid].doneSeqNum,tid); + } + + if (fromCommit->commitInfo[tid].nonSpecSeqNum != 0) { + + //DPRINTF(IEW,"NonspecInst from thread %i",tid); + if (fromCommit->commitInfo[tid].uncached) { + instQueue.replayMemInst(fromCommit->commitInfo[tid].uncachedLoad); + } else { + instQueue.scheduleNonSpec( + fromCommit->commitInfo[tid].nonSpecSeqNum); + } + } + + if (broadcast_free_entries) { + toFetch->iewInfo[tid].iqCount = + instQueue.getCount(tid); + toFetch->iewInfo[tid].ldstqCount = + ldstQueue.getCount(tid); + + toRename->iewInfo[tid].usedIQ = true; + toRename->iewInfo[tid].freeIQEntries = + instQueue.numFreeEntries(); + toRename->iewInfo[tid].usedLSQ = true; + toRename->iewInfo[tid].freeLSQEntries = + ldstQueue.numFreeEntries(tid); + + wroteToTimeBuffer = true; + } + + DPRINTF(IEW, "[tid:%i], Dispatch dispatched %i instructions.\n", + tid, toRename->iewInfo[tid].dispatched); + } + + DPRINTF(IEW, "IQ has %i free entries (Can schedule: %i). " + "LSQ has %i free entries.\n", + instQueue.numFreeEntries(), instQueue.hasReadyInsts(), + ldstQueue.numFreeEntries()); + + updateStatus(); + + if (wroteToTimeBuffer) { + DPRINTF(Activity, "Activity this cycle.\n"); + cpu->activityThisCycle(); + } +} + +template <class Impl> +void +DefaultIEW<Impl>::updateExeInstStats(DynInstPtr &inst) +{ + int thread_number = inst->threadNumber; + + // + // Pick off the software prefetches + // +#ifdef TARGET_ALPHA + if (inst->isDataPrefetch()) + iewExecutedSwp[thread_number]++; + else + iewIewExecutedcutedInsts++; +#else + iewExecutedInsts++; +#endif + + // + // Control operations + // + if (inst->isControl()) + iewExecutedBranches[thread_number]++; + + // + // Memory operations + // + if (inst->isMemRef()) { + iewExecutedRefs[thread_number]++; + + if (inst->isLoad()) { + iewExecLoadInsts[thread_number]++; + } + } +} diff --git a/src/cpu/o3/inst_queue.cc b/src/cpu/o3/inst_queue.cc new file mode 100644 index 000000000..a539066f9 --- /dev/null +++ b/src/cpu/o3/inst_queue.cc @@ -0,0 +1,35 @@ +/* + * Copyright (c) 2004-2005 The Regents of The University of Michigan + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are + * met: redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer; + * redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution; + * neither the name of the copyright holders nor the names of its + * contributors may be used to endorse or promote products derived from + * this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + * Authors: Kevin Lim + */ + +#include "cpu/o3/isa_specific.hh" +#include "cpu/o3/inst_queue_impl.hh" + +// Force instantiation of InstructionQueue. +template class InstructionQueue<O3CPUImpl>; diff --git a/src/cpu/o3/inst_queue.hh b/src/cpu/o3/inst_queue.hh new file mode 100644 index 000000000..3dd4dc658 --- /dev/null +++ b/src/cpu/o3/inst_queue.hh @@ -0,0 +1,507 @@ +/* + * Copyright (c) 2004-2006 The Regents of The University of Michigan + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are + * met: redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer; + * redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution; + * neither the name of the copyright holders nor the names of its + * contributors may be used to endorse or promote products derived from + * this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + * Authors: Kevin Lim + */ + +#ifndef __CPU_O3_INST_QUEUE_HH__ +#define __CPU_O3_INST_QUEUE_HH__ + +#include <list> +#include <map> +#include <queue> +#include <vector> + +#include "base/statistics.hh" +#include "base/timebuf.hh" +#include "cpu/inst_seq.hh" +#include "cpu/o3/dep_graph.hh" +#include "cpu/op_class.hh" +#include "sim/host.hh" + +class FUPool; +class MemInterface; + +/** + * A standard instruction queue class. It holds ready instructions, in + * order, in seperate priority queues to facilitate the scheduling of + * instructions. The IQ uses a separate linked list to track dependencies. + * Similar to the rename map and the free list, it expects that + * floating point registers have their indices start after the integer + * registers (ie with 96 int and 96 fp registers, regs 0-95 are integer + * and 96-191 are fp). This remains true even for both logical and + * physical register indices. The IQ depends on the memory dependence unit to + * track when memory operations are ready in terms of ordering; register + * dependencies are tracked normally. Right now the IQ also handles the + * execution timing; this is mainly to allow back-to-back scheduling without + * requiring IEW to be able to peek into the IQ. At the end of the execution + * latency, the instruction is put into the queue to execute, where it will + * have the execute() function called on it. + * @todo: Make IQ able to handle multiple FU pools. + */ +template <class Impl> +class InstructionQueue +{ + public: + //Typedefs from the Impl. + typedef typename Impl::O3CPU O3CPU; + typedef typename Impl::DynInstPtr DynInstPtr; + typedef typename Impl::Params Params; + + typedef typename Impl::CPUPol::IEW IEW; + typedef typename Impl::CPUPol::MemDepUnit MemDepUnit; + typedef typename Impl::CPUPol::IssueStruct IssueStruct; + typedef typename Impl::CPUPol::TimeStruct TimeStruct; + + // Typedef of iterator through the list of instructions. + typedef typename std::list<DynInstPtr>::iterator ListIt; + + friend class Impl::O3CPU; + + /** FU completion event class. */ + class FUCompletion : public Event { + private: + /** Executing instruction. */ + DynInstPtr inst; + + /** Index of the FU used for executing. */ + int fuIdx; + + /** Pointer back to the instruction queue. */ + InstructionQueue<Impl> *iqPtr; + + /** Should the FU be added to the list to be freed upon + * completing this event. + */ + bool freeFU; + + public: + /** Construct a FU completion event. */ + FUCompletion(DynInstPtr &_inst, int fu_idx, + InstructionQueue<Impl> *iq_ptr); + + virtual void process(); + virtual const char *description(); + void setFreeFU() { freeFU = true; } + }; + + /** Constructs an IQ. */ + InstructionQueue(Params *params); + + /** Destructs the IQ. */ + ~InstructionQueue(); + + /** Returns the name of the IQ. */ + std::string name() const; + + /** Registers statistics. */ + void regStats(); + + /** Resets all instruction queue state. */ + void resetState(); + + /** Sets CPU pointer. */ + void setCPU(O3CPU *_cpu) { cpu = _cpu; } + + /** Sets active threads list. */ + void setActiveThreads(std::list<unsigned> *at_ptr); + + /** Sets the IEW pointer. */ + void setIEW(IEW *iew_ptr) { iewStage = iew_ptr; } + + /** Sets the timer buffer between issue and execute. */ + void setIssueToExecuteQueue(TimeBuffer<IssueStruct> *i2eQueue); + + /** Sets the global time buffer. */ + void setTimeBuffer(TimeBuffer<TimeStruct> *tb_ptr); + + /** Switches out the instruction queue. */ + void switchOut(); + + /** Takes over execution from another CPU's thread. */ + void takeOverFrom(); + + /** Returns if the IQ is switched out. */ + bool isSwitchedOut() { return switchedOut; } + + /** Number of entries needed for given amount of threads. */ + int entryAmount(int num_threads); + + /** Resets max entries for all threads. */ + void resetEntries(); + + /** Returns total number of free entries. */ + unsigned numFreeEntries(); + + /** Returns number of free entries for a thread. */ + unsigned numFreeEntries(unsigned tid); + + /** Returns whether or not the IQ is full. */ + bool isFull(); + + /** Returns whether or not the IQ is full for a specific thread. */ + bool isFull(unsigned tid); + + /** Returns if there are any ready instructions in the IQ. */ + bool hasReadyInsts(); + + /** Inserts a new instruction into the IQ. */ + void insert(DynInstPtr &new_inst); + + /** Inserts a new, non-speculative instruction into the IQ. */ + void insertNonSpec(DynInstPtr &new_inst); + + /** Inserts a memory or write barrier into the IQ to make sure + * loads and stores are ordered properly. + */ + void insertBarrier(DynInstPtr &barr_inst); + + /** Returns the oldest scheduled instruction, and removes it from + * the list of instructions waiting to execute. + */ + DynInstPtr getInstToExecute(); + + /** + * Records the instruction as the producer of a register without + * adding it to the rest of the IQ. + */ + void recordProducer(DynInstPtr &inst) + { addToProducers(inst); } + + /** Process FU completion event. */ + void processFUCompletion(DynInstPtr &inst, int fu_idx); + + /** + * Schedules ready instructions, adding the ready ones (oldest first) to + * the queue to execute. + */ + void scheduleReadyInsts(); + + /** Schedules a single specific non-speculative instruction. */ + void scheduleNonSpec(const InstSeqNum &inst); + + /** + * Commits all instructions up to and including the given sequence number, + * for a specific thread. + */ + void commit(const InstSeqNum &inst, unsigned tid = 0); + + /** Wakes all dependents of a completed instruction. */ + int wakeDependents(DynInstPtr &completed_inst); + + /** Adds a ready memory instruction to the ready list. */ + void addReadyMemInst(DynInstPtr &ready_inst); + + /** + * Reschedules a memory instruction. It will be ready to issue once + * replayMemInst() is called. + */ + void rescheduleMemInst(DynInstPtr &resched_inst); + + /** Replays a memory instruction. It must be rescheduled first. */ + void replayMemInst(DynInstPtr &replay_inst); + + /** Completes a memory operation. */ + void completeMemInst(DynInstPtr &completed_inst); + + /** Indicates an ordering violation between a store and a load. */ + void violation(DynInstPtr &store, DynInstPtr &faulting_load); + + /** + * Squashes instructions for a thread. Squashing information is obtained + * from the time buffer. + */ + void squash(unsigned tid); + + /** Returns the number of used entries for a thread. */ + unsigned getCount(unsigned tid) { return count[tid]; }; + + /** Debug function to print all instructions. */ + void printInsts(); + + private: + /** Does the actual squashing. */ + void doSquash(unsigned tid); + + ///////////////////////// + // Various pointers + ///////////////////////// + + /** Pointer to the CPU. */ + O3CPU *cpu; + + /** Cache interface. */ + MemInterface *dcacheInterface; + + /** Pointer to IEW stage. */ + IEW *iewStage; + + /** The memory dependence unit, which tracks/predicts memory dependences + * between instructions. + */ + MemDepUnit memDepUnit[Impl::MaxThreads]; + + /** The queue to the execute stage. Issued instructions will be written + * into it. + */ + TimeBuffer<IssueStruct> *issueToExecuteQueue; + + /** The backwards time buffer. */ + TimeBuffer<TimeStruct> *timeBuffer; + + /** Wire to read information from timebuffer. */ + typename TimeBuffer<TimeStruct>::wire fromCommit; + + /** Function unit pool. */ + FUPool *fuPool; + + ////////////////////////////////////// + // Instruction lists, ready queues, and ordering + ////////////////////////////////////// + + /** List of all the instructions in the IQ (some of which may be issued). */ + std::list<DynInstPtr> instList[Impl::MaxThreads]; + + /** List of instructions that are ready to be executed. */ + std::list<DynInstPtr> instsToExecute; + + /** + * Struct for comparing entries to be added to the priority queue. + * This gives reverse ordering to the instructions in terms of + * sequence numbers: the instructions with smaller sequence + * numbers (and hence are older) will be at the top of the + * priority queue. + */ + struct pqCompare { + bool operator() (const DynInstPtr &lhs, const DynInstPtr &rhs) const + { + return lhs->seqNum > rhs->seqNum; + } + }; + + typedef std::priority_queue<DynInstPtr, std::vector<DynInstPtr>, pqCompare> + ReadyInstQueue; + + /** List of ready instructions, per op class. They are separated by op + * class to allow for easy mapping to FUs. + */ + ReadyInstQueue readyInsts[Num_OpClasses]; + + /** List of non-speculative instructions that will be scheduled + * once the IQ gets a signal from commit. While it's redundant to + * have the key be a part of the value (the sequence number is stored + * inside of DynInst), when these instructions are woken up only + * the sequence number will be available. Thus it is most efficient to be + * able to search by the sequence number alone. + */ + std::map<InstSeqNum, DynInstPtr> nonSpecInsts; + + typedef typename std::map<InstSeqNum, DynInstPtr>::iterator NonSpecMapIt; + + /** Entry for the list age ordering by op class. */ + struct ListOrderEntry { + OpClass queueType; + InstSeqNum oldestInst; + }; + + /** List that contains the age order of the oldest instruction of each + * ready queue. Used to select the oldest instruction available + * among op classes. + * @todo: Might be better to just move these entries around instead + * of creating new ones every time the position changes due to an + * instruction issuing. Not sure std::list supports this. + */ + std::list<ListOrderEntry> listOrder; + + typedef typename std::list<ListOrderEntry>::iterator ListOrderIt; + + /** Tracks if each ready queue is on the age order list. */ + bool queueOnList[Num_OpClasses]; + + /** Iterators of each ready queue. Points to their spot in the age order + * list. + */ + ListOrderIt readyIt[Num_OpClasses]; + + /** Add an op class to the age order list. */ + void addToOrderList(OpClass op_class); + + /** + * Called when the oldest instruction has been removed from a ready queue; + * this places that ready queue into the proper spot in the age order list. + */ + void moveToYoungerInst(ListOrderIt age_order_it); + + DependencyGraph<DynInstPtr> dependGraph; + + ////////////////////////////////////// + // Various parameters + ////////////////////////////////////// + + /** IQ Resource Sharing Policy */ + enum IQPolicy { + Dynamic, + Partitioned, + Threshold + }; + + /** IQ sharing policy for SMT. */ + IQPolicy iqPolicy; + + /** Number of Total Threads*/ + unsigned numThreads; + + /** Pointer to list of active threads. */ + std::list<unsigned> *activeThreads; + + /** Per Thread IQ count */ + unsigned count[Impl::MaxThreads]; + + /** Max IQ Entries Per Thread */ + unsigned maxEntries[Impl::MaxThreads]; + + /** Number of free IQ entries left. */ + unsigned freeEntries; + + /** The number of entries in the instruction queue. */ + unsigned numEntries; + + /** The total number of instructions that can be issued in one cycle. */ + unsigned totalWidth; + + /** The number of physical registers in the CPU. */ + unsigned numPhysRegs; + + /** The number of physical integer registers in the CPU. */ + unsigned numPhysIntRegs; + + /** The number of floating point registers in the CPU. */ + unsigned numPhysFloatRegs; + + /** Delay between commit stage and the IQ. + * @todo: Make there be a distinction between the delays within IEW. + */ + unsigned commitToIEWDelay; + + /** Is the IQ switched out. */ + bool switchedOut; + + /** The sequence number of the squashed instruction. */ + InstSeqNum squashedSeqNum[Impl::MaxThreads]; + + /** A cache of the recently woken registers. It is 1 if the register + * has been woken up recently, and 0 if the register has been added + * to the dependency graph and has not yet received its value. It + * is basically a secondary scoreboard, and should pretty much mirror + * the scoreboard that exists in the rename map. + */ + std::vector<bool> regScoreboard; + + /** Adds an instruction to the dependency graph, as a consumer. */ + bool addToDependents(DynInstPtr &new_inst); + + /** Adds an instruction to the dependency graph, as a producer. */ + void addToProducers(DynInstPtr &new_inst); + + /** Moves an instruction to the ready queue if it is ready. */ + void addIfReady(DynInstPtr &inst); + + /** Debugging function to count how many entries are in the IQ. It does + * a linear walk through the instructions, so do not call this function + * during normal execution. + */ + int countInsts(); + + /** Debugging function to dump all the list sizes, as well as print + * out the list of nonspeculative instructions. Should not be used + * in any other capacity, but it has no harmful sideaffects. + */ + void dumpLists(); + + /** Debugging function to dump out all instructions that are in the + * IQ. + */ + void dumpInsts(); + + /** Stat for number of instructions added. */ + Stats::Scalar<> iqInstsAdded; + /** Stat for number of non-speculative instructions added. */ + Stats::Scalar<> iqNonSpecInstsAdded; + + Stats::Scalar<> iqInstsIssued; + /** Stat for number of integer instructions issued. */ + Stats::Scalar<> iqIntInstsIssued; + /** Stat for number of floating point instructions issued. */ + Stats::Scalar<> iqFloatInstsIssued; + /** Stat for number of branch instructions issued. */ + Stats::Scalar<> iqBranchInstsIssued; + /** Stat for number of memory instructions issued. */ + Stats::Scalar<> iqMemInstsIssued; + /** Stat for number of miscellaneous instructions issued. */ + Stats::Scalar<> iqMiscInstsIssued; + /** Stat for number of squashed instructions that were ready to issue. */ + Stats::Scalar<> iqSquashedInstsIssued; + /** Stat for number of squashed instructions examined when squashing. */ + Stats::Scalar<> iqSquashedInstsExamined; + /** Stat for number of squashed instruction operands examined when + * squashing. + */ + Stats::Scalar<> iqSquashedOperandsExamined; + /** Stat for number of non-speculative instructions removed due to a squash. + */ + Stats::Scalar<> iqSquashedNonSpecRemoved; + // Also include number of instructions rescheduled and replayed. + + /** Distribution of number of instructions in the queue. + * @todo: Need to create struct to track the entry time for each + * instruction. */ +// Stats::VectorDistribution<> queueResDist; + /** Distribution of the number of instructions issued. */ + Stats::Distribution<> numIssuedDist; + /** Distribution of the cycles it takes to issue an instruction. + * @todo: Need to create struct to track the ready time for each + * instruction. */ +// Stats::VectorDistribution<> issueDelayDist; + + /** Number of times an instruction could not be issued because a + * FU was busy. + */ + Stats::Vector<> statFuBusy; +// Stats::Vector<> dist_unissued; + /** Stat for total number issued for each instruction type. */ + Stats::Vector2d<> statIssuedInstType; + + /** Number of instructions issued per cycle. */ + Stats::Formula issueRate; + + /** Number of times the FU was busy. */ + Stats::Vector<> fuBusy; + /** Number of times the FU was busy per instruction issued. */ + Stats::Formula fuBusyRate; +}; + +#endif //__CPU_O3_INST_QUEUE_HH__ diff --git a/src/cpu/o3/inst_queue_impl.hh b/src/cpu/o3/inst_queue_impl.hh new file mode 100644 index 000000000..6edb528a9 --- /dev/null +++ b/src/cpu/o3/inst_queue_impl.hh @@ -0,0 +1,1405 @@ +/* + * Copyright (c) 2004-2006 The Regents of The University of Michigan + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are + * met: redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer; + * redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution; + * neither the name of the copyright holders nor the names of its + * contributors may be used to endorse or promote products derived from + * this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + * Authors: Kevin Lim + * Korey Sewell + */ + +#include <limits> +#include <vector> + +#include "sim/root.hh" + +#include "cpu/o3/fu_pool.hh" +#include "cpu/o3/inst_queue.hh" + +template <class Impl> +InstructionQueue<Impl>::FUCompletion::FUCompletion(DynInstPtr &_inst, + int fu_idx, + InstructionQueue<Impl> *iq_ptr) + : Event(&mainEventQueue, Stat_Event_Pri), + inst(_inst), fuIdx(fu_idx), iqPtr(iq_ptr), freeFU(false) +{ + this->setFlags(Event::AutoDelete); +} + +template <class Impl> +void +InstructionQueue<Impl>::FUCompletion::process() +{ + iqPtr->processFUCompletion(inst, freeFU ? fuIdx : -1); + inst = NULL; +} + + +template <class Impl> +const char * +InstructionQueue<Impl>::FUCompletion::description() +{ + return "Functional unit completion event"; +} + +template <class Impl> +InstructionQueue<Impl>::InstructionQueue(Params *params) + : fuPool(params->fuPool), + numEntries(params->numIQEntries), + totalWidth(params->issueWidth), + numPhysIntRegs(params->numPhysIntRegs), + numPhysFloatRegs(params->numPhysFloatRegs), + commitToIEWDelay(params->commitToIEWDelay) +{ + assert(fuPool); + + switchedOut = false; + + numThreads = params->numberOfThreads; + + // Set the number of physical registers as the number of int + float + numPhysRegs = numPhysIntRegs + numPhysFloatRegs; + + DPRINTF(IQ, "There are %i physical registers.\n", numPhysRegs); + + //Create an entry for each physical register within the + //dependency graph. + dependGraph.resize(numPhysRegs); + + // Resize the register scoreboard. + regScoreboard.resize(numPhysRegs); + + //Initialize Mem Dependence Units + for (int i = 0; i < numThreads; i++) { + memDepUnit[i].init(params,i); + memDepUnit[i].setIQ(this); + } + + resetState(); + + std::string policy = params->smtIQPolicy; + + //Convert string to lowercase + std::transform(policy.begin(), policy.end(), policy.begin(), + (int(*)(int)) tolower); + + //Figure out resource sharing policy + if (policy == "dynamic") { + iqPolicy = Dynamic; + + //Set Max Entries to Total ROB Capacity + for (int i = 0; i < numThreads; i++) { + maxEntries[i] = numEntries; + } + + } else if (policy == "partitioned") { + iqPolicy = Partitioned; + + //@todo:make work if part_amt doesnt divide evenly. + int part_amt = numEntries / numThreads; + + //Divide ROB up evenly + for (int i = 0; i < numThreads; i++) { + maxEntries[i] = part_amt; + } + + DPRINTF(IQ, "IQ sharing policy set to Partitioned:" + "%i entries per thread.\n",part_amt); + + } else if (policy == "threshold") { + iqPolicy = Threshold; + + double threshold = (double)params->smtIQThreshold / 100; + + int thresholdIQ = (int)((double)threshold * numEntries); + + //Divide up by threshold amount + for (int i = 0; i < numThreads; i++) { + maxEntries[i] = thresholdIQ; + } + + DPRINTF(IQ, "IQ sharing policy set to Threshold:" + "%i entries per thread.\n",thresholdIQ); + } else { + assert(0 && "Invalid IQ Sharing Policy.Options Are:{Dynamic," + "Partitioned, Threshold}"); + } +} + +template <class Impl> +InstructionQueue<Impl>::~InstructionQueue() +{ + dependGraph.reset(); +#ifdef DEBUG + cprintf("Nodes traversed: %i, removed: %i\n", + dependGraph.nodesTraversed, dependGraph.nodesRemoved); +#endif +} + +template <class Impl> +std::string +InstructionQueue<Impl>::name() const +{ + return cpu->name() + ".iq"; +} + +template <class Impl> +void +InstructionQueue<Impl>::regStats() +{ + using namespace Stats; + iqInstsAdded + .name(name() + ".iqInstsAdded") + .desc("Number of instructions added to the IQ (excludes non-spec)") + .prereq(iqInstsAdded); + + iqNonSpecInstsAdded + .name(name() + ".iqNonSpecInstsAdded") + .desc("Number of non-speculative instructions added to the IQ") + .prereq(iqNonSpecInstsAdded); + + iqInstsIssued + .name(name() + ".iqInstsIssued") + .desc("Number of instructions issued") + .prereq(iqInstsIssued); + + iqIntInstsIssued + .name(name() + ".iqIntInstsIssued") + .desc("Number of integer instructions issued") + .prereq(iqIntInstsIssued); + + iqFloatInstsIssued + .name(name() + ".iqFloatInstsIssued") + .desc("Number of float instructions issued") + .prereq(iqFloatInstsIssued); + + iqBranchInstsIssued + .name(name() + ".iqBranchInstsIssued") + .desc("Number of branch instructions issued") + .prereq(iqBranchInstsIssued); + + iqMemInstsIssued + .name(name() + ".iqMemInstsIssued") + .desc("Number of memory instructions issued") + .prereq(iqMemInstsIssued); + + iqMiscInstsIssued + .name(name() + ".iqMiscInstsIssued") + .desc("Number of miscellaneous instructions issued") + .prereq(iqMiscInstsIssued); + + iqSquashedInstsIssued + .name(name() + ".iqSquashedInstsIssued") + .desc("Number of squashed instructions issued") + .prereq(iqSquashedInstsIssued); + + iqSquashedInstsExamined + .name(name() + ".iqSquashedInstsExamined") + .desc("Number of squashed instructions iterated over during squash;" + " mainly for profiling") + .prereq(iqSquashedInstsExamined); + + iqSquashedOperandsExamined + .name(name() + ".iqSquashedOperandsExamined") + .desc("Number of squashed operands that are examined and possibly " + "removed from graph") + .prereq(iqSquashedOperandsExamined); + + iqSquashedNonSpecRemoved + .name(name() + ".iqSquashedNonSpecRemoved") + .desc("Number of squashed non-spec instructions that were removed") + .prereq(iqSquashedNonSpecRemoved); +/* + queueResDist + .init(Num_OpClasses, 0, 99, 2) + .name(name() + ".IQ:residence:") + .desc("cycles from dispatch to issue") + .flags(total | pdf | cdf ) + ; + for (int i = 0; i < Num_OpClasses; ++i) { + queueResDist.subname(i, opClassStrings[i]); + } +*/ + numIssuedDist + .init(0,totalWidth,1) + .name(name() + ".ISSUE:issued_per_cycle") + .desc("Number of insts issued each cycle") + .flags(pdf) + ; +/* + dist_unissued + .init(Num_OpClasses+2) + .name(name() + ".ISSUE:unissued_cause") + .desc("Reason ready instruction not issued") + .flags(pdf | dist) + ; + for (int i=0; i < (Num_OpClasses + 2); ++i) { + dist_unissued.subname(i, unissued_names[i]); + } +*/ + statIssuedInstType + .init(numThreads,Num_OpClasses) + .name(name() + ".ISSUE:FU_type") + .desc("Type of FU issued") + .flags(total | pdf | dist) + ; + statIssuedInstType.ysubnames(opClassStrings); + + // + // How long did instructions for a particular FU type wait prior to issue + // +/* + issueDelayDist + .init(Num_OpClasses,0,99,2) + .name(name() + ".ISSUE:") + .desc("cycles from operands ready to issue") + .flags(pdf | cdf) + ; + + for (int i=0; i<Num_OpClasses; ++i) { + std::stringstream subname; + subname << opClassStrings[i] << "_delay"; + issueDelayDist.subname(i, subname.str()); + } +*/ + issueRate + .name(name() + ".ISSUE:rate") + .desc("Inst issue rate") + .flags(total) + ; + issueRate = iqInstsIssued / cpu->numCycles; + + statFuBusy + .init(Num_OpClasses) + .name(name() + ".ISSUE:fu_full") + .desc("attempts to use FU when none available") + .flags(pdf | dist) + ; + for (int i=0; i < Num_OpClasses; ++i) { + statFuBusy.subname(i, opClassStrings[i]); + } + + fuBusy + .init(numThreads) + .name(name() + ".ISSUE:fu_busy_cnt") + .desc("FU busy when requested") + .flags(total) + ; + + fuBusyRate + .name(name() + ".ISSUE:fu_busy_rate") + .desc("FU busy rate (busy events/executed inst)") + .flags(total) + ; + fuBusyRate = fuBusy / iqInstsIssued; + + for ( int i=0; i < numThreads; i++) { + // Tell mem dependence unit to reg stats as well. + memDepUnit[i].regStats(); + } +} + +template <class Impl> +void +InstructionQueue<Impl>::resetState() +{ + //Initialize thread IQ counts + for (int i = 0; i <numThreads; i++) { + count[i] = 0; + instList[i].clear(); + } + + // Initialize the number of free IQ entries. + freeEntries = numEntries; + + // Note that in actuality, the registers corresponding to the logical + // registers start off as ready. However this doesn't matter for the + // IQ as the instruction should have been correctly told if those + // registers are ready in rename. Thus it can all be initialized as + // unready. + for (int i = 0; i < numPhysRegs; ++i) { + regScoreboard[i] = false; + } + + for (int i = 0; i < numThreads; ++i) { + squashedSeqNum[i] = 0; + } + + for (int i = 0; i < Num_OpClasses; ++i) { + while (!readyInsts[i].empty()) + readyInsts[i].pop(); + queueOnList[i] = false; + readyIt[i] = listOrder.end(); + } + nonSpecInsts.clear(); + listOrder.clear(); +} + +template <class Impl> +void +InstructionQueue<Impl>::setActiveThreads(std::list<unsigned> *at_ptr) +{ + DPRINTF(IQ, "Setting active threads list pointer.\n"); + activeThreads = at_ptr; +} + +template <class Impl> +void +InstructionQueue<Impl>::setIssueToExecuteQueue(TimeBuffer<IssueStruct> *i2e_ptr) +{ + DPRINTF(IQ, "Set the issue to execute queue.\n"); + issueToExecuteQueue = i2e_ptr; +} + +template <class Impl> +void +InstructionQueue<Impl>::setTimeBuffer(TimeBuffer<TimeStruct> *tb_ptr) +{ + DPRINTF(IQ, "Set the time buffer.\n"); + timeBuffer = tb_ptr; + + fromCommit = timeBuffer->getWire(-commitToIEWDelay); +} + +template <class Impl> +void +InstructionQueue<Impl>::switchOut() +{ +/* + if (!instList[0].empty() || (numEntries != freeEntries) || + !readyInsts[0].empty() || !nonSpecInsts.empty() || !listOrder.empty()) { + dumpInsts(); +// assert(0); + } +*/ + resetState(); + dependGraph.reset(); + instsToExecute.clear(); + switchedOut = true; + for (int i = 0; i < numThreads; ++i) { + memDepUnit[i].switchOut(); + } +} + +template <class Impl> +void +InstructionQueue<Impl>::takeOverFrom() +{ + switchedOut = false; +} + +template <class Impl> +int +InstructionQueue<Impl>::entryAmount(int num_threads) +{ + if (iqPolicy == Partitioned) { + return numEntries / num_threads; + } else { + return 0; + } +} + + +template <class Impl> +void +InstructionQueue<Impl>::resetEntries() +{ + if (iqPolicy != Dynamic || numThreads > 1) { + int active_threads = (*activeThreads).size(); + + std::list<unsigned>::iterator threads = (*activeThreads).begin(); + std::list<unsigned>::iterator list_end = (*activeThreads).end(); + + while (threads != list_end) { + if (iqPolicy == Partitioned) { + maxEntries[*threads++] = numEntries / active_threads; + } else if(iqPolicy == Threshold && active_threads == 1) { + maxEntries[*threads++] = numEntries; + } + } + } +} + +template <class Impl> +unsigned +InstructionQueue<Impl>::numFreeEntries() +{ + return freeEntries; +} + +template <class Impl> +unsigned +InstructionQueue<Impl>::numFreeEntries(unsigned tid) +{ + return maxEntries[tid] - count[tid]; +} + +// Might want to do something more complex if it knows how many instructions +// will be issued this cycle. +template <class Impl> +bool +InstructionQueue<Impl>::isFull() +{ + if (freeEntries == 0) { + return(true); + } else { + return(false); + } +} + +template <class Impl> +bool +InstructionQueue<Impl>::isFull(unsigned tid) +{ + if (numFreeEntries(tid) == 0) { + return(true); + } else { + return(false); + } +} + +template <class Impl> +bool +InstructionQueue<Impl>::hasReadyInsts() +{ + if (!listOrder.empty()) { + return true; + } + + for (int i = 0; i < Num_OpClasses; ++i) { + if (!readyInsts[i].empty()) { + return true; + } + } + + return false; +} + +template <class Impl> +void +InstructionQueue<Impl>::insert(DynInstPtr &new_inst) +{ + // Make sure the instruction is valid + assert(new_inst); + + DPRINTF(IQ, "Adding instruction [sn:%lli] PC %#x to the IQ.\n", + new_inst->seqNum, new_inst->readPC()); + + assert(freeEntries != 0); + + instList[new_inst->threadNumber].push_back(new_inst); + + --freeEntries; + + new_inst->setInIQ(); + + // Look through its source registers (physical regs), and mark any + // dependencies. + addToDependents(new_inst); + + // Have this instruction set itself as the producer of its destination + // register(s). + addToProducers(new_inst); + + if (new_inst->isMemRef()) { + memDepUnit[new_inst->threadNumber].insert(new_inst); + } else { + addIfReady(new_inst); + } + + ++iqInstsAdded; + + count[new_inst->threadNumber]++; + + assert(freeEntries == (numEntries - countInsts())); +} + +template <class Impl> +void +InstructionQueue<Impl>::insertNonSpec(DynInstPtr &new_inst) +{ + // @todo: Clean up this code; can do it by setting inst as unable + // to issue, then calling normal insert on the inst. + + assert(new_inst); + + nonSpecInsts[new_inst->seqNum] = new_inst; + + DPRINTF(IQ, "Adding non-speculative instruction [sn:%lli] PC %#x " + "to the IQ.\n", + new_inst->seqNum, new_inst->readPC()); + + assert(freeEntries != 0); + + instList[new_inst->threadNumber].push_back(new_inst); + + --freeEntries; + + new_inst->setInIQ(); + + // Have this instruction set itself as the producer of its destination + // register(s). + addToProducers(new_inst); + + // If it's a memory instruction, add it to the memory dependency + // unit. + if (new_inst->isMemRef()) { + memDepUnit[new_inst->threadNumber].insertNonSpec(new_inst); + } + + ++iqNonSpecInstsAdded; + + count[new_inst->threadNumber]++; + + assert(freeEntries == (numEntries - countInsts())); +} + +template <class Impl> +void +InstructionQueue<Impl>::insertBarrier(DynInstPtr &barr_inst) +{ + memDepUnit[barr_inst->threadNumber].insertBarrier(barr_inst); + + insertNonSpec(barr_inst); +} + +template <class Impl> +typename Impl::DynInstPtr +InstructionQueue<Impl>::getInstToExecute() +{ + assert(!instsToExecute.empty()); + DynInstPtr inst = instsToExecute.front(); + instsToExecute.pop_front(); + return inst; +} + +template <class Impl> +void +InstructionQueue<Impl>::addToOrderList(OpClass op_class) +{ + assert(!readyInsts[op_class].empty()); + + ListOrderEntry queue_entry; + + queue_entry.queueType = op_class; + + queue_entry.oldestInst = readyInsts[op_class].top()->seqNum; + + ListOrderIt list_it = listOrder.begin(); + ListOrderIt list_end_it = listOrder.end(); + + while (list_it != list_end_it) { + if ((*list_it).oldestInst > queue_entry.oldestInst) { + break; + } + + list_it++; + } + + readyIt[op_class] = listOrder.insert(list_it, queue_entry); + queueOnList[op_class] = true; +} + +template <class Impl> +void +InstructionQueue<Impl>::moveToYoungerInst(ListOrderIt list_order_it) +{ + // Get iterator of next item on the list + // Delete the original iterator + // Determine if the next item is either the end of the list or younger + // than the new instruction. If so, then add in a new iterator right here. + // If not, then move along. + ListOrderEntry queue_entry; + OpClass op_class = (*list_order_it).queueType; + ListOrderIt next_it = list_order_it; + + ++next_it; + + queue_entry.queueType = op_class; + queue_entry.oldestInst = readyInsts[op_class].top()->seqNum; + + while (next_it != listOrder.end() && + (*next_it).oldestInst < queue_entry.oldestInst) { + ++next_it; + } + + readyIt[op_class] = listOrder.insert(next_it, queue_entry); +} + +template <class Impl> +void +InstructionQueue<Impl>::processFUCompletion(DynInstPtr &inst, int fu_idx) +{ + DPRINTF(IQ, "Processing FU completion [sn:%lli]\n", inst->seqNum); + // The CPU could have been sleeping until this op completed (*extremely* + // long latency op). Wake it if it was. This may be overkill. + if (isSwitchedOut()) { + DPRINTF(IQ, "FU completion not processed, IQ is switched out [sn:%lli]\n", + inst->seqNum); + return; + } + + iewStage->wakeCPU(); + + if (fu_idx > -1) + fuPool->freeUnitNextCycle(fu_idx); + + // @todo: Ensure that these FU Completions happen at the beginning + // of a cycle, otherwise they could add too many instructions to + // the queue. + issueToExecuteQueue->access(0)->size++; + instsToExecute.push_back(inst); +} + +// @todo: Figure out a better way to remove the squashed items from the +// lists. Checking the top item of each list to see if it's squashed +// wastes time and forces jumps. +template <class Impl> +void +InstructionQueue<Impl>::scheduleReadyInsts() +{ + DPRINTF(IQ, "Attempting to schedule ready instructions from " + "the IQ.\n"); + + IssueStruct *i2e_info = issueToExecuteQueue->access(0); + + // Have iterator to head of the list + // While I haven't exceeded bandwidth or reached the end of the list, + // Try to get a FU that can do what this op needs. + // If successful, change the oldestInst to the new top of the list, put + // the queue in the proper place in the list. + // Increment the iterator. + // This will avoid trying to schedule a certain op class if there are no + // FUs that handle it. + ListOrderIt order_it = listOrder.begin(); + ListOrderIt order_end_it = listOrder.end(); + int total_issued = 0; + + while (total_issued < totalWidth && + iewStage->canIssue() && + order_it != order_end_it) { + OpClass op_class = (*order_it).queueType; + + assert(!readyInsts[op_class].empty()); + + DynInstPtr issuing_inst = readyInsts[op_class].top(); + + assert(issuing_inst->seqNum == (*order_it).oldestInst); + + if (issuing_inst->isSquashed()) { + readyInsts[op_class].pop(); + + if (!readyInsts[op_class].empty()) { + moveToYoungerInst(order_it); + } else { + readyIt[op_class] = listOrder.end(); + queueOnList[op_class] = false; + } + + listOrder.erase(order_it++); + + ++iqSquashedInstsIssued; + + continue; + } + + int idx = -2; + int op_latency = 1; + int tid = issuing_inst->threadNumber; + + if (op_class != No_OpClass) { + idx = fuPool->getUnit(op_class); + + if (idx > -1) { + op_latency = fuPool->getOpLatency(op_class); + } + } + + // If we have an instruction that doesn't require a FU, or a + // valid FU, then schedule for execution. + if (idx == -2 || idx != -1) { + if (op_latency == 1) { + i2e_info->size++; + instsToExecute.push_back(issuing_inst); + + // Add the FU onto the list of FU's to be freed next + // cycle if we used one. + if (idx >= 0) + fuPool->freeUnitNextCycle(idx); + } else { + int issue_latency = fuPool->getIssueLatency(op_class); + // Generate completion event for the FU + FUCompletion *execution = new FUCompletion(issuing_inst, + idx, this); + + execution->schedule(curTick + cpu->cycles(issue_latency - 1)); + + // @todo: Enforce that issue_latency == 1 or op_latency + if (issue_latency > 1) { + // If FU isn't pipelined, then it must be freed + // upon the execution completing. + execution->setFreeFU(); + } else { + // Add the FU onto the list of FU's to be freed next cycle. + fuPool->freeUnitNextCycle(idx); + } + } + + DPRINTF(IQ, "Thread %i: Issuing instruction PC %#x " + "[sn:%lli]\n", + tid, issuing_inst->readPC(), + issuing_inst->seqNum); + + readyInsts[op_class].pop(); + + if (!readyInsts[op_class].empty()) { + moveToYoungerInst(order_it); + } else { + readyIt[op_class] = listOrder.end(); + queueOnList[op_class] = false; + } + + issuing_inst->setIssued(); + ++total_issued; + + if (!issuing_inst->isMemRef()) { + // Memory instructions can not be freed from the IQ until they + // complete. + ++freeEntries; + count[tid]--; + issuing_inst->clearInIQ(); + } else { + memDepUnit[tid].issue(issuing_inst); + } + + listOrder.erase(order_it++); + statIssuedInstType[tid][op_class]++; + iewStage->incrWb(issuing_inst->seqNum); + } else { + statFuBusy[op_class]++; + fuBusy[tid]++; + ++order_it; + } + } + + numIssuedDist.sample(total_issued); + iqInstsIssued+= total_issued; + + // If we issued any instructions, tell the CPU we had activity. + if (total_issued) { + cpu->activityThisCycle(); + } else { + DPRINTF(IQ, "Not able to schedule any instructions.\n"); + } +} + +template <class Impl> +void +InstructionQueue<Impl>::scheduleNonSpec(const InstSeqNum &inst) +{ + DPRINTF(IQ, "Marking nonspeculative instruction [sn:%lli] as ready " + "to execute.\n", inst); + + NonSpecMapIt inst_it = nonSpecInsts.find(inst); + + assert(inst_it != nonSpecInsts.end()); + + unsigned tid = (*inst_it).second->threadNumber; + + (*inst_it).second->setCanIssue(); + + if (!(*inst_it).second->isMemRef()) { + addIfReady((*inst_it).second); + } else { + memDepUnit[tid].nonSpecInstReady((*inst_it).second); + } + + (*inst_it).second = NULL; + + nonSpecInsts.erase(inst_it); +} + +template <class Impl> +void +InstructionQueue<Impl>::commit(const InstSeqNum &inst, unsigned tid) +{ + DPRINTF(IQ, "[tid:%i]: Committing instructions older than [sn:%i]\n", + tid,inst); + + ListIt iq_it = instList[tid].begin(); + + while (iq_it != instList[tid].end() && + (*iq_it)->seqNum <= inst) { + ++iq_it; + instList[tid].pop_front(); + } + + assert(freeEntries == (numEntries - countInsts())); +} + +template <class Impl> +int +InstructionQueue<Impl>::wakeDependents(DynInstPtr &completed_inst) +{ + int dependents = 0; + + DPRINTF(IQ, "Waking dependents of completed instruction.\n"); + + assert(!completed_inst->isSquashed()); + + // Tell the memory dependence unit to wake any dependents on this + // instruction if it is a memory instruction. Also complete the memory + // instruction at this point since we know it executed without issues. + // @todo: Might want to rename "completeMemInst" to something that + // indicates that it won't need to be replayed, and call this + // earlier. Might not be a big deal. + if (completed_inst->isMemRef()) { + memDepUnit[completed_inst->threadNumber].wakeDependents(completed_inst); + completeMemInst(completed_inst); + } else if (completed_inst->isMemBarrier() || + completed_inst->isWriteBarrier()) { + memDepUnit[completed_inst->threadNumber].completeBarrier(completed_inst); + } + + for (int dest_reg_idx = 0; + dest_reg_idx < completed_inst->numDestRegs(); + dest_reg_idx++) + { + PhysRegIndex dest_reg = + completed_inst->renamedDestRegIdx(dest_reg_idx); + + // Special case of uniq or control registers. They are not + // handled by the IQ and thus have no dependency graph entry. + // @todo Figure out a cleaner way to handle this. + if (dest_reg >= numPhysRegs) { + continue; + } + + DPRINTF(IQ, "Waking any dependents on register %i.\n", + (int) dest_reg); + + //Go through the dependency chain, marking the registers as + //ready within the waiting instructions. + DynInstPtr dep_inst = dependGraph.pop(dest_reg); + + while (dep_inst) { + DPRINTF(IQ, "Waking up a dependent instruction, PC%#x.\n", + dep_inst->readPC()); + + // Might want to give more information to the instruction + // so that it knows which of its source registers is + // ready. However that would mean that the dependency + // graph entries would need to hold the src_reg_idx. + dep_inst->markSrcRegReady(); + + addIfReady(dep_inst); + + dep_inst = dependGraph.pop(dest_reg); + + ++dependents; + } + + // Reset the head node now that all of its dependents have + // been woken up. + assert(dependGraph.empty(dest_reg)); + dependGraph.clearInst(dest_reg); + + // Mark the scoreboard as having that register ready. + regScoreboard[dest_reg] = true; + } + return dependents; +} + +template <class Impl> +void +InstructionQueue<Impl>::addReadyMemInst(DynInstPtr &ready_inst) +{ + OpClass op_class = ready_inst->opClass(); + + readyInsts[op_class].push(ready_inst); + + // Will need to reorder the list if either a queue is not on the list, + // or it has an older instruction than last time. + if (!queueOnList[op_class]) { + addToOrderList(op_class); + } else if (readyInsts[op_class].top()->seqNum < + (*readyIt[op_class]).oldestInst) { + listOrder.erase(readyIt[op_class]); + addToOrderList(op_class); + } + + DPRINTF(IQ, "Instruction is ready to issue, putting it onto " + "the ready list, PC %#x opclass:%i [sn:%lli].\n", + ready_inst->readPC(), op_class, ready_inst->seqNum); +} + +template <class Impl> +void +InstructionQueue<Impl>::rescheduleMemInst(DynInstPtr &resched_inst) +{ + memDepUnit[resched_inst->threadNumber].reschedule(resched_inst); +} + +template <class Impl> +void +InstructionQueue<Impl>::replayMemInst(DynInstPtr &replay_inst) +{ + memDepUnit[replay_inst->threadNumber].replay(replay_inst); +} + +template <class Impl> +void +InstructionQueue<Impl>::completeMemInst(DynInstPtr &completed_inst) +{ + int tid = completed_inst->threadNumber; + + DPRINTF(IQ, "Completing mem instruction PC:%#x [sn:%lli]\n", + completed_inst->readPC(), completed_inst->seqNum); + + ++freeEntries; + + completed_inst->memOpDone = true; + + memDepUnit[tid].completed(completed_inst); + + count[tid]--; +} + +template <class Impl> +void +InstructionQueue<Impl>::violation(DynInstPtr &store, + DynInstPtr &faulting_load) +{ + memDepUnit[store->threadNumber].violation(store, faulting_load); +} + +template <class Impl> +void +InstructionQueue<Impl>::squash(unsigned tid) +{ + DPRINTF(IQ, "[tid:%i]: Starting to squash instructions in " + "the IQ.\n", tid); + + // Read instruction sequence number of last instruction out of the + // time buffer. +#if ISA_HAS_DELAY_SLOT + squashedSeqNum[tid] = fromCommit->commitInfo[tid].bdelayDoneSeqNum; +#else + squashedSeqNum[tid] = fromCommit->commitInfo[tid].doneSeqNum; +#endif + + // Call doSquash if there are insts in the IQ + if (count[tid] > 0) { + doSquash(tid); + } + + // Also tell the memory dependence unit to squash. + memDepUnit[tid].squash(squashedSeqNum[tid], tid); +} + +template <class Impl> +void +InstructionQueue<Impl>::doSquash(unsigned tid) +{ + // Start at the tail. + ListIt squash_it = instList[tid].end(); + --squash_it; + + DPRINTF(IQ, "[tid:%i]: Squashing until sequence number %i!\n", + tid, squashedSeqNum[tid]); + + // Squash any instructions younger than the squashed sequence number + // given. + while (squash_it != instList[tid].end() && + (*squash_it)->seqNum > squashedSeqNum[tid]) { + + DynInstPtr squashed_inst = (*squash_it); + + // Only handle the instruction if it actually is in the IQ and + // hasn't already been squashed in the IQ. + if (squashed_inst->threadNumber != tid || + squashed_inst->isSquashedInIQ()) { + --squash_it; + continue; + } + + if (!squashed_inst->isIssued() || + (squashed_inst->isMemRef() && + !squashed_inst->memOpDone)) { + + DPRINTF(IQ, "[tid:%i]: Instruction [sn:%lli] PC %#x " + "squashed.\n", + tid, squashed_inst->seqNum, squashed_inst->readPC()); + + // Remove the instruction from the dependency list. + if (!squashed_inst->isNonSpeculative() && + !squashed_inst->isStoreConditional() && + !squashed_inst->isMemBarrier() && + !squashed_inst->isWriteBarrier()) { + + for (int src_reg_idx = 0; + src_reg_idx < squashed_inst->numSrcRegs(); + src_reg_idx++) + { + PhysRegIndex src_reg = + squashed_inst->renamedSrcRegIdx(src_reg_idx); + + // Only remove it from the dependency graph if it + // was placed there in the first place. + + // Instead of doing a linked list traversal, we + // can just remove these squashed instructions + // either at issue time, or when the register is + // overwritten. The only downside to this is it + // leaves more room for error. + + if (!squashed_inst->isReadySrcRegIdx(src_reg_idx) && + src_reg < numPhysRegs) { + dependGraph.remove(src_reg, squashed_inst); + } + + + ++iqSquashedOperandsExamined; + } + } else if (!squashed_inst->isStoreConditional() || !squashed_inst->isCompleted()) { + NonSpecMapIt ns_inst_it = + nonSpecInsts.find(squashed_inst->seqNum); + assert(ns_inst_it != nonSpecInsts.end()); + + (*ns_inst_it).second = NULL; + + nonSpecInsts.erase(ns_inst_it); + + ++iqSquashedNonSpecRemoved; + } + + // Might want to also clear out the head of the dependency graph. + + // Mark it as squashed within the IQ. + squashed_inst->setSquashedInIQ(); + + // @todo: Remove this hack where several statuses are set so the + // inst will flow through the rest of the pipeline. + squashed_inst->setIssued(); + squashed_inst->setCanCommit(); + squashed_inst->clearInIQ(); + + //Update Thread IQ Count + count[squashed_inst->threadNumber]--; + + ++freeEntries; + } + + instList[tid].erase(squash_it--); + ++iqSquashedInstsExamined; + } +} + +template <class Impl> +bool +InstructionQueue<Impl>::addToDependents(DynInstPtr &new_inst) +{ + // Loop through the instruction's source registers, adding + // them to the dependency list if they are not ready. + int8_t total_src_regs = new_inst->numSrcRegs(); + bool return_val = false; + + for (int src_reg_idx = 0; + src_reg_idx < total_src_regs; + src_reg_idx++) + { + // Only add it to the dependency graph if it's not ready. + if (!new_inst->isReadySrcRegIdx(src_reg_idx)) { + PhysRegIndex src_reg = new_inst->renamedSrcRegIdx(src_reg_idx); + + // Check the IQ's scoreboard to make sure the register + // hasn't become ready while the instruction was in flight + // between stages. Only if it really isn't ready should + // it be added to the dependency graph. + if (src_reg >= numPhysRegs) { + continue; + } else if (regScoreboard[src_reg] == false) { + DPRINTF(IQ, "Instruction PC %#x has src reg %i that " + "is being added to the dependency chain.\n", + new_inst->readPC(), src_reg); + + dependGraph.insert(src_reg, new_inst); + + // Change the return value to indicate that something + // was added to the dependency graph. + return_val = true; + } else { + DPRINTF(IQ, "Instruction PC %#x has src reg %i that " + "became ready before it reached the IQ.\n", + new_inst->readPC(), src_reg); + // Mark a register ready within the instruction. + new_inst->markSrcRegReady(src_reg_idx); + } + } + } + + return return_val; +} + +template <class Impl> +void +InstructionQueue<Impl>::addToProducers(DynInstPtr &new_inst) +{ + // Nothing really needs to be marked when an instruction becomes + // the producer of a register's value, but for convenience a ptr + // to the producing instruction will be placed in the head node of + // the dependency links. + int8_t total_dest_regs = new_inst->numDestRegs(); + + for (int dest_reg_idx = 0; + dest_reg_idx < total_dest_regs; + dest_reg_idx++) + { + PhysRegIndex dest_reg = new_inst->renamedDestRegIdx(dest_reg_idx); + + // Instructions that use the misc regs will have a reg number + // higher than the normal physical registers. In this case these + // registers are not renamed, and there is no need to track + // dependencies as these instructions must be executed at commit. + if (dest_reg >= numPhysRegs) { + continue; + } + + if (!dependGraph.empty(dest_reg)) { + dependGraph.dump(); + panic("Dependency graph %i not empty!", dest_reg); + } + + dependGraph.setInst(dest_reg, new_inst); + + // Mark the scoreboard to say it's not yet ready. + regScoreboard[dest_reg] = false; + } +} + +template <class Impl> +void +InstructionQueue<Impl>::addIfReady(DynInstPtr &inst) +{ + // If the instruction now has all of its source registers + // available, then add it to the list of ready instructions. + if (inst->readyToIssue()) { + + //Add the instruction to the proper ready list. + if (inst->isMemRef()) { + + DPRINTF(IQ, "Checking if memory instruction can issue.\n"); + + // Message to the mem dependence unit that this instruction has + // its registers ready. + memDepUnit[inst->threadNumber].regsReady(inst); + + return; + } + + OpClass op_class = inst->opClass(); + + DPRINTF(IQ, "Instruction is ready to issue, putting it onto " + "the ready list, PC %#x opclass:%i [sn:%lli].\n", + inst->readPC(), op_class, inst->seqNum); + + readyInsts[op_class].push(inst); + + // Will need to reorder the list if either a queue is not on the list, + // or it has an older instruction than last time. + if (!queueOnList[op_class]) { + addToOrderList(op_class); + } else if (readyInsts[op_class].top()->seqNum < + (*readyIt[op_class]).oldestInst) { + listOrder.erase(readyIt[op_class]); + addToOrderList(op_class); + } + } +} + +template <class Impl> +int +InstructionQueue<Impl>::countInsts() +{ +#if 0 + //ksewell:This works but definitely could use a cleaner write + //with a more intuitive way of counting. Right now it's + //just brute force .... + // Change the #if if you want to use this method. + int total_insts = 0; + + for (int i = 0; i < numThreads; ++i) { + ListIt count_it = instList[i].begin(); + + while (count_it != instList[i].end()) { + if (!(*count_it)->isSquashed() && !(*count_it)->isSquashedInIQ()) { + if (!(*count_it)->isIssued()) { + ++total_insts; + } else if ((*count_it)->isMemRef() && + !(*count_it)->memOpDone) { + // Loads that have not been marked as executed still count + // towards the total instructions. + ++total_insts; + } + } + + ++count_it; + } + } + + return total_insts; +#else + return numEntries - freeEntries; +#endif +} + +template <class Impl> +void +InstructionQueue<Impl>::dumpLists() +{ + for (int i = 0; i < Num_OpClasses; ++i) { + cprintf("Ready list %i size: %i\n", i, readyInsts[i].size()); + + cprintf("\n"); + } + + cprintf("Non speculative list size: %i\n", nonSpecInsts.size()); + + NonSpecMapIt non_spec_it = nonSpecInsts.begin(); + NonSpecMapIt non_spec_end_it = nonSpecInsts.end(); + + cprintf("Non speculative list: "); + + while (non_spec_it != non_spec_end_it) { + cprintf("%#x [sn:%lli]", (*non_spec_it).second->readPC(), + (*non_spec_it).second->seqNum); + ++non_spec_it; + } + + cprintf("\n"); + + ListOrderIt list_order_it = listOrder.begin(); + ListOrderIt list_order_end_it = listOrder.end(); + int i = 1; + + cprintf("List order: "); + + while (list_order_it != list_order_end_it) { + cprintf("%i OpClass:%i [sn:%lli] ", i, (*list_order_it).queueType, + (*list_order_it).oldestInst); + + ++list_order_it; + ++i; + } + + cprintf("\n"); +} + + +template <class Impl> +void +InstructionQueue<Impl>::dumpInsts() +{ + for (int i = 0; i < numThreads; ++i) { + int num = 0; + int valid_num = 0; + ListIt inst_list_it = instList[i].begin(); + + while (inst_list_it != instList[i].end()) + { + cprintf("Instruction:%i\n", + num); + if (!(*inst_list_it)->isSquashed()) { + if (!(*inst_list_it)->isIssued()) { + ++valid_num; + cprintf("Count:%i\n", valid_num); + } else if ((*inst_list_it)->isMemRef() && + !(*inst_list_it)->memOpDone) { + // Loads that have not been marked as executed + // still count towards the total instructions. + ++valid_num; + cprintf("Count:%i\n", valid_num); + } + } + + cprintf("PC:%#x\n[sn:%lli]\n[tid:%i]\n" + "Issued:%i\nSquashed:%i\n", + (*inst_list_it)->readPC(), + (*inst_list_it)->seqNum, + (*inst_list_it)->threadNumber, + (*inst_list_it)->isIssued(), + (*inst_list_it)->isSquashed()); + + if ((*inst_list_it)->isMemRef()) { + cprintf("MemOpDone:%i\n", (*inst_list_it)->memOpDone); + } + + cprintf("\n"); + + inst_list_it++; + ++num; + } + } + + cprintf("Insts to Execute list:\n"); + + int num = 0; + int valid_num = 0; + ListIt inst_list_it = instsToExecute.begin(); + + while (inst_list_it != instsToExecute.end()) + { + cprintf("Instruction:%i\n", + num); + if (!(*inst_list_it)->isSquashed()) { + if (!(*inst_list_it)->isIssued()) { + ++valid_num; + cprintf("Count:%i\n", valid_num); + } else if ((*inst_list_it)->isMemRef() && + !(*inst_list_it)->memOpDone) { + // Loads that have not been marked as executed + // still count towards the total instructions. + ++valid_num; + cprintf("Count:%i\n", valid_num); + } + } + + cprintf("PC:%#x\n[sn:%lli]\n[tid:%i]\n" + "Issued:%i\nSquashed:%i\n", + (*inst_list_it)->readPC(), + (*inst_list_it)->seqNum, + (*inst_list_it)->threadNumber, + (*inst_list_it)->isIssued(), + (*inst_list_it)->isSquashed()); + + if ((*inst_list_it)->isMemRef()) { + cprintf("MemOpDone:%i\n", (*inst_list_it)->memOpDone); + } + + cprintf("\n"); + + inst_list_it++; + ++num; + } +} diff --git a/src/cpu/o3/isa_specific.hh b/src/cpu/o3/isa_specific.hh new file mode 100755 index 000000000..4937589e3 --- /dev/null +++ b/src/cpu/o3/isa_specific.hh @@ -0,0 +1,45 @@ +/* + * Copyright (c) 2006 The Regents of The University of Michigan + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are + * met: redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer; + * redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution; + * neither the name of the copyright holders nor the names of its + * contributors may be used to endorse or promote products derived from + * this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + * Authors: Korey Sewell + */ + +#include "cpu/base.hh" + +#if THE_ISA == ALPHA_ISA + #include "cpu/o3/alpha/cpu.hh" + #include "cpu/o3/alpha/impl.hh" + #include "cpu/o3/alpha/params.hh" + #include "cpu/o3/alpha/dyn_inst.hh" +#elif THE_ISA == MIPS_ISA + #include "cpu/o3/mips/cpu.hh" + #include "cpu/o3/mips/impl.hh" + #include "cpu/o3/mips/params.hh" + #include "cpu/o3/mips/dyn_inst.hh" +#else + #error "ISA-specific header files O3CPU not defined ISA" +#endif diff --git a/src/cpu/o3/lsq.cc b/src/cpu/o3/lsq.cc new file mode 100644 index 000000000..527947281 --- /dev/null +++ b/src/cpu/o3/lsq.cc @@ -0,0 +1,36 @@ +/* + * Copyright (c) 2004-2005 The Regents of The University of Michigan + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are + * met: redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer; + * redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution; + * neither the name of the copyright holders nor the names of its + * contributors may be used to endorse or promote products derived from + * this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + * Authors: Korey Sewell + */ + +#include "cpu/o3/isa_specific.hh" +#include "cpu/o3/lsq_impl.hh" + +// Force the instantiation of LDSTQ for all the implementations we care about. +template class LSQ<O3CPUImpl>; + diff --git a/src/cpu/o3/lsq.hh b/src/cpu/o3/lsq.hh new file mode 100644 index 000000000..190734dc2 --- /dev/null +++ b/src/cpu/o3/lsq.hh @@ -0,0 +1,383 @@ +/* + * Copyright (c) 2004-2006 The Regents of The University of Michigan + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are + * met: redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer; + * redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution; + * neither the name of the copyright holders nor the names of its + * contributors may be used to endorse or promote products derived from + * this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + * Authors: Korey Sewell + */ + +#ifndef __CPU_O3_LSQ_HH__ +#define __CPU_O3_LSQ_HH__ + +#include <map> +#include <queue> + +#include "config/full_system.hh" +#include "cpu/inst_seq.hh" +#include "cpu/o3/lsq_unit.hh" +#include "mem/port.hh" +#include "sim/sim_object.hh" + +template <class Impl> +class LSQ { + public: + typedef typename Impl::Params Params; + typedef typename Impl::O3CPU O3CPU; + typedef typename Impl::DynInstPtr DynInstPtr; + typedef typename Impl::CPUPol::IEW IEW; + typedef typename Impl::CPUPol::LSQUnit LSQUnit; + + /** SMT policy. */ + enum LSQPolicy { + Dynamic, + Partitioned, + Threshold + }; + + /** Constructs an LSQ with the given parameters. */ + LSQ(Params *params); + + /** Returns the name of the LSQ. */ + std::string name() const; + + /** Registers statistics of each LSQ unit. */ + void regStats(); + + /** Returns dcache port. + * @todo: Dcache port needs to be moved up to this level for SMT + * to work. For now it just returns the port from one of the + * threads. + */ + Port *getDcachePort() { return &dcachePort; } + + /** Sets the pointer to the list of active threads. */ + void setActiveThreads(std::list<unsigned> *at_ptr); + /** Sets the CPU pointer. */ + void setCPU(O3CPU *cpu_ptr); + /** Sets the IEW stage pointer. */ + void setIEW(IEW *iew_ptr); + /** Switches out the LSQ. */ + void switchOut(); + /** Takes over execution from another CPU's thread. */ + void takeOverFrom(); + + /** Number of entries needed for the given amount of threads.*/ + int entryAmount(int num_threads); + void removeEntries(unsigned tid); + /** Reset the max entries for each thread. */ + void resetEntries(); + /** Resize the max entries for a thread. */ + void resizeEntries(unsigned size, unsigned tid); + + /** Ticks the LSQ. */ + void tick(); + /** Ticks a specific LSQ Unit. */ + void tick(unsigned tid) + { thread[tid].tick(); } + + /** Inserts a load into the LSQ. */ + void insertLoad(DynInstPtr &load_inst); + /** Inserts a store into the LSQ. */ + void insertStore(DynInstPtr &store_inst); + + /** Executes a load. */ + Fault executeLoad(DynInstPtr &inst); + + /** Executes a store. */ + Fault executeStore(DynInstPtr &inst); + + /** + * Commits loads up until the given sequence number for a specific thread. + */ + void commitLoads(InstSeqNum &youngest_inst, unsigned tid) + { thread[tid].commitLoads(youngest_inst); } + + /** + * Commits stores up until the given sequence number for a specific thread. + */ + void commitStores(InstSeqNum &youngest_inst, unsigned tid) + { thread[tid].commitStores(youngest_inst); } + + /** + * Attempts to write back stores until all cache ports are used or the + * interface becomes blocked. + */ + void writebackStores(); + /** Same as above, but only for one thread. */ + void writebackStores(unsigned tid); + + /** + * Squash instructions from a thread until the specified sequence number. + */ + void squash(const InstSeqNum &squashed_num, unsigned tid) + { thread[tid].squash(squashed_num); } + + /** Returns whether or not there was a memory ordering violation. */ + bool violation(); + /** + * Returns whether or not there was a memory ordering violation for a + * specific thread. + */ + bool violation(unsigned tid) + { return thread[tid].violation(); } + + /** Returns if a load is blocked due to the memory system for a specific + * thread. + */ + bool loadBlocked(unsigned tid) + { return thread[tid].loadBlocked(); } + + bool isLoadBlockedHandled(unsigned tid) + { return thread[tid].isLoadBlockedHandled(); } + + void setLoadBlockedHandled(unsigned tid) + { thread[tid].setLoadBlockedHandled(); } + + /** Gets the instruction that caused the memory ordering violation. */ + DynInstPtr getMemDepViolator(unsigned tid) + { return thread[tid].getMemDepViolator(); } + + /** Returns the head index of the load queue for a specific thread. */ + int getLoadHead(unsigned tid) + { return thread[tid].getLoadHead(); } + + /** Returns the sequence number of the head of the load queue. */ + InstSeqNum getLoadHeadSeqNum(unsigned tid) + { + return thread[tid].getLoadHeadSeqNum(); + } + + /** Returns the head index of the store queue. */ + int getStoreHead(unsigned tid) + { return thread[tid].getStoreHead(); } + + /** Returns the sequence number of the head of the store queue. */ + InstSeqNum getStoreHeadSeqNum(unsigned tid) + { + return thread[tid].getStoreHeadSeqNum(); + } + + /** Returns the number of instructions in all of the queues. */ + int getCount(); + /** Returns the number of instructions in the queues of one thread. */ + int getCount(unsigned tid) + { return thread[tid].getCount(); } + + /** Returns the total number of loads in the load queue. */ + int numLoads(); + /** Returns the total number of loads for a single thread. */ + int numLoads(unsigned tid) + { return thread[tid].numLoads(); } + + /** Returns the total number of stores in the store queue. */ + int numStores(); + /** Returns the total number of stores for a single thread. */ + int numStores(unsigned tid) + { return thread[tid].numStores(); } + + /** Returns the total number of loads that are ready. */ + int numLoadsReady(); + /** Returns the number of loads that are ready for a single thread. */ + int numLoadsReady(unsigned tid) + { return thread[tid].numLoadsReady(); } + + /** Returns the number of free entries. */ + unsigned numFreeEntries(); + /** Returns the number of free entries for a specific thread. */ + unsigned numFreeEntries(unsigned tid); + + /** Returns if the LSQ is full (either LQ or SQ is full). */ + bool isFull(); + /** + * Returns if the LSQ is full for a specific thread (either LQ or SQ is + * full). + */ + bool isFull(unsigned tid); + + /** Returns if any of the LQs are full. */ + bool lqFull(); + /** Returns if the LQ of a given thread is full. */ + bool lqFull(unsigned tid); + + /** Returns if any of the SQs are full. */ + bool sqFull(); + /** Returns if the SQ of a given thread is full. */ + bool sqFull(unsigned tid); + + /** + * Returns if the LSQ is stalled due to a memory operation that must be + * replayed. + */ + bool isStalled(); + /** + * Returns if the LSQ of a specific thread is stalled due to a memory + * operation that must be replayed. + */ + bool isStalled(unsigned tid); + + /** Returns whether or not there are any stores to write back to memory. */ + bool hasStoresToWB(); + + /** Returns whether or not a specific thread has any stores to write back + * to memory. + */ + bool hasStoresToWB(unsigned tid) + { return thread[tid].hasStoresToWB(); } + + /** Returns the number of stores a specific thread has to write back. */ + int numStoresToWB(unsigned tid) + { return thread[tid].numStoresToWB(); } + + /** Returns if the LSQ will write back to memory this cycle. */ + bool willWB(); + /** Returns if the LSQ of a specific thread will write back to memory this + * cycle. + */ + bool willWB(unsigned tid) + { return thread[tid].willWB(); } + + /** Returns if the cache is currently blocked. */ + bool cacheBlocked() + { return retryTid != -1; } + + /** Sets the retry thread id, indicating that one of the LSQUnits + * tried to access the cache but the cache was blocked. */ + void setRetryTid(int tid) + { retryTid = tid; } + + /** Debugging function to print out all instructions. */ + void dumpInsts(); + /** Debugging function to print out instructions from a specific thread. */ + void dumpInsts(unsigned tid) + { thread[tid].dumpInsts(); } + + /** Executes a read operation, using the load specified at the load index. */ + template <class T> + Fault read(RequestPtr req, T &data, int load_idx); + + /** Executes a store operation, using the store specified at the store + * index. + */ + template <class T> + Fault write(RequestPtr req, T &data, int store_idx); + + /** DcachePort class for this LSQ. Handles doing the + * communication with the cache/memory. + */ + class DcachePort : public Port + { + protected: + /** Pointer to LSQ. */ + LSQ *lsq; + + public: + /** Default constructor. */ + DcachePort(LSQ *_lsq) + : lsq(_lsq) + { } + + protected: + /** Atomic version of receive. Panics. */ + virtual Tick recvAtomic(PacketPtr pkt); + + /** Functional version of receive. Panics. */ + virtual void recvFunctional(PacketPtr pkt); + + /** Receives status change. Other than range changing, panics. */ + virtual void recvStatusChange(Status status); + + /** Returns the address ranges of this device. */ + virtual void getDeviceAddressRanges(AddrRangeList &resp, + AddrRangeList &snoop) + { resp.clear(); snoop.clear(); } + + /** Timing version of receive. Handles writing back and + * completing the load or store that has returned from + * memory. */ + virtual bool recvTiming(PacketPtr pkt); + + /** Handles doing a retry of the previous send. */ + virtual void recvRetry(); + }; + + /** D-cache port. */ + DcachePort dcachePort; + + protected: + /** The LSQ policy for SMT mode. */ + LSQPolicy lsqPolicy; + + /** The LSQ units for individual threads. */ + LSQUnit thread[Impl::MaxThreads]; + + /** The CPU pointer. */ + O3CPU *cpu; + + /** The IEW stage pointer. */ + IEW *iewStage; + + /** List of Active Threads in System. */ + std::list<unsigned> *activeThreads; + + /** Total Size of LQ Entries. */ + unsigned LQEntries; + /** Total Size of SQ Entries. */ + unsigned SQEntries; + + /** Max LQ Size - Used to Enforce Sharing Policies. */ + unsigned maxLQEntries; + + /** Max SQ Size - Used to Enforce Sharing Policies. */ + unsigned maxSQEntries; + + /** Number of Threads. */ + unsigned numThreads; + + /** The thread id of the LSQ Unit that is currently waiting for a + * retry. */ + int retryTid; +}; + +template <class Impl> +template <class T> +Fault +LSQ<Impl>::read(RequestPtr req, T &data, int load_idx) +{ + unsigned tid = req->getThreadNum(); + + return thread[tid].read(req, data, load_idx); +} + +template <class Impl> +template <class T> +Fault +LSQ<Impl>::write(RequestPtr req, T &data, int store_idx) +{ + unsigned tid = req->getThreadNum(); + + return thread[tid].write(req, data, store_idx); +} + +#endif // __CPU_O3_LSQ_HH__ diff --git a/src/cpu/o3/lsq_impl.hh b/src/cpu/o3/lsq_impl.hh new file mode 100644 index 000000000..a1ac5adb8 --- /dev/null +++ b/src/cpu/o3/lsq_impl.hh @@ -0,0 +1,603 @@ +/* + * Copyright (c) 2005-2006 The Regents of The University of Michigan + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are + * met: redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer; + * redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution; + * neither the name of the copyright holders nor the names of its + * contributors may be used to endorse or promote products derived from + * this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + * Authors: Korey Sewell + */ + +#include <algorithm> +#include <list> +#include <string> + +#include "cpu/o3/lsq.hh" + +template <class Impl> +Tick +LSQ<Impl>::DcachePort::recvAtomic(PacketPtr pkt) +{ + panic("O3CPU model does not work with atomic mode!"); + return curTick; +} + +template <class Impl> +void +LSQ<Impl>::DcachePort::recvFunctional(PacketPtr pkt) +{ + panic("O3CPU doesn't expect recvFunctional callback!"); +} + +template <class Impl> +void +LSQ<Impl>::DcachePort::recvStatusChange(Status status) +{ + if (status == RangeChange) + return; + + panic("O3CPU doesn't expect recvStatusChange callback!"); +} + +template <class Impl> +bool +LSQ<Impl>::DcachePort::recvTiming(PacketPtr pkt) +{ + lsq->thread[pkt->req->getThreadNum()].completeDataAccess(pkt); + return true; +} + +template <class Impl> +void +LSQ<Impl>::DcachePort::recvRetry() +{ + if (lsq->retryTid == -1) + { + //Squashed, so drop it + return; + } + lsq->thread[lsq->retryTid].recvRetry(); + // Speculatively clear the retry Tid. This will get set again if + // the LSQUnit was unable to complete its access. + lsq->retryTid = -1; +} + +template <class Impl> +LSQ<Impl>::LSQ(Params *params) + : dcachePort(this), LQEntries(params->LQEntries), + SQEntries(params->SQEntries), numThreads(params->numberOfThreads), + retryTid(-1) +{ + DPRINTF(LSQ, "Creating LSQ object.\n"); + + //**********************************************/ + //************ Handle SMT Parameters ***********/ + //**********************************************/ + std::string policy = params->smtLSQPolicy; + + //Convert string to lowercase + std::transform(policy.begin(), policy.end(), policy.begin(), + (int(*)(int)) tolower); + + //Figure out fetch policy + if (policy == "dynamic") { + lsqPolicy = Dynamic; + + maxLQEntries = LQEntries; + maxSQEntries = SQEntries; + + DPRINTF(LSQ, "LSQ sharing policy set to Dynamic\n"); + + } else if (policy == "partitioned") { + lsqPolicy = Partitioned; + + //@todo:make work if part_amt doesnt divide evenly. + maxLQEntries = LQEntries / numThreads; + maxSQEntries = SQEntries / numThreads; + + DPRINTF(Fetch, "LSQ sharing policy set to Partitioned: " + "%i entries per LQ | %i entries per SQ", + maxLQEntries,maxSQEntries); + + } else if (policy == "threshold") { + lsqPolicy = Threshold; + + assert(params->smtLSQThreshold > LQEntries); + assert(params->smtLSQThreshold > SQEntries); + + //Divide up by threshold amount + //@todo: Should threads check the max and the total + //amount of the LSQ + maxLQEntries = params->smtLSQThreshold; + maxSQEntries = params->smtLSQThreshold; + + DPRINTF(LSQ, "LSQ sharing policy set to Threshold: " + "%i entries per LQ | %i entries per SQ", + maxLQEntries,maxSQEntries); + + } else { + assert(0 && "Invalid LSQ Sharing Policy.Options Are:{Dynamic," + "Partitioned, Threshold}"); + } + + //Initialize LSQs + for (int tid=0; tid < numThreads; tid++) { + thread[tid].init(params, this, maxLQEntries, maxSQEntries, tid); + thread[tid].setDcachePort(&dcachePort); + } +} + + +template<class Impl> +std::string +LSQ<Impl>::name() const +{ + return iewStage->name() + ".lsq"; +} + +template<class Impl> +void +LSQ<Impl>::regStats() +{ + //Initialize LSQs + for (int tid=0; tid < numThreads; tid++) { + thread[tid].regStats(); + } +} + +template<class Impl> +void +LSQ<Impl>::regStats() +{ + //Initialize LSQs + for (int tid=0; tid < numThreads; tid++) { + thread[tid].regStats(); + } +} + +template<class Impl> +void +LSQ<Impl>::setActiveThreads(std::list<unsigned> *at_ptr) +{ + activeThreads = at_ptr; + assert(activeThreads != 0); +} + +template<class Impl> +void +LSQ<Impl>::setCPU(O3CPU *cpu_ptr) +{ + cpu = cpu_ptr; + + dcachePort.setName(name()); + + for (int tid=0; tid < numThreads; tid++) { + thread[tid].setCPU(cpu_ptr); + } +} + +template<class Impl> +void +LSQ<Impl>::setIEW(IEW *iew_ptr) +{ + iewStage = iew_ptr; + + for (int tid=0; tid < numThreads; tid++) { + thread[tid].setIEW(iew_ptr); + } +} + +template <class Impl> +void +LSQ<Impl>::switchOut() +{ + for (int tid = 0; tid < numThreads; tid++) { + thread[tid].switchOut(); + } +} + +template <class Impl> +void +LSQ<Impl>::takeOverFrom() +{ + for (int tid = 0; tid < numThreads; tid++) { + thread[tid].takeOverFrom(); + } +} + +template <class Impl> +int +LSQ<Impl>::entryAmount(int num_threads) +{ + if (lsqPolicy == Partitioned) { + return LQEntries / num_threads; + } else { + return 0; + } +} + +template <class Impl> +void +LSQ<Impl>::resetEntries() +{ + if (lsqPolicy != Dynamic || numThreads > 1) { + int active_threads = (*activeThreads).size(); + + std::list<unsigned>::iterator threads = (*activeThreads).begin(); + std::list<unsigned>::iterator list_end = (*activeThreads).end(); + + int maxEntries; + + if (lsqPolicy == Partitioned) { + maxEntries = LQEntries / active_threads; + } else if (lsqPolicy == Threshold && active_threads == 1) { + maxEntries = LQEntries; + } else { + maxEntries = LQEntries; + } + + while (threads != list_end) { + resizeEntries(maxEntries,*threads++); + } + } +} + +template<class Impl> +void +LSQ<Impl>::removeEntries(unsigned tid) +{ + thread[tid].clearLQ(); + thread[tid].clearSQ(); +} + +template<class Impl> +void +LSQ<Impl>::resizeEntries(unsigned size,unsigned tid) +{ + thread[tid].resizeLQ(size); + thread[tid].resizeSQ(size); +} + +template<class Impl> +void +LSQ<Impl>::tick() +{ + std::list<unsigned>::iterator active_threads = (*activeThreads).begin(); + + while (active_threads != (*activeThreads).end()) { + unsigned tid = *active_threads++; + + thread[tid].tick(); + } +} + +template<class Impl> +void +LSQ<Impl>::insertLoad(DynInstPtr &load_inst) +{ + unsigned tid = load_inst->threadNumber; + + thread[tid].insertLoad(load_inst); +} + +template<class Impl> +void +LSQ<Impl>::insertStore(DynInstPtr &store_inst) +{ + unsigned tid = store_inst->threadNumber; + + thread[tid].insertStore(store_inst); +} + +template<class Impl> +Fault +LSQ<Impl>::executeLoad(DynInstPtr &inst) +{ + unsigned tid = inst->threadNumber; + + return thread[tid].executeLoad(inst); +} + +template<class Impl> +Fault +LSQ<Impl>::executeStore(DynInstPtr &inst) +{ + unsigned tid = inst->threadNumber; + + return thread[tid].executeStore(inst); +} + +template<class Impl> +void +LSQ<Impl>::writebackStores() +{ + std::list<unsigned>::iterator active_threads = (*activeThreads).begin(); + + while (active_threads != (*activeThreads).end()) { + unsigned tid = *active_threads++; + + if (numStoresToWB(tid) > 0) { + DPRINTF(Writeback,"[tid:%i] Writing back stores. %i stores " + "available for Writeback.\n", tid, numStoresToWB(tid)); + } + + thread[tid].writebackStores(); + } +} + +template<class Impl> +bool +LSQ<Impl>::violation() +{ + /* Answers: Does Anybody Have a Violation?*/ + std::list<unsigned>::iterator active_threads = (*activeThreads).begin(); + + while (active_threads != (*activeThreads).end()) { + unsigned tid = *active_threads++; + if (thread[tid].violation()) + return true; + } + + return false; +} + +template<class Impl> +int +LSQ<Impl>::getCount() +{ + unsigned total = 0; + + std::list<unsigned>::iterator active_threads = (*activeThreads).begin(); + + while (active_threads != (*activeThreads).end()) { + unsigned tid = *active_threads++; + total += getCount(tid); + } + + return total; +} + +template<class Impl> +int +LSQ<Impl>::numLoads() +{ + unsigned total = 0; + + std::list<unsigned>::iterator active_threads = (*activeThreads).begin(); + + while (active_threads != (*activeThreads).end()) { + unsigned tid = *active_threads++; + total += numLoads(tid); + } + + return total; +} + +template<class Impl> +int +LSQ<Impl>::numStores() +{ + unsigned total = 0; + + std::list<unsigned>::iterator active_threads = (*activeThreads).begin(); + + while (active_threads != (*activeThreads).end()) { + unsigned tid = *active_threads++; + total += thread[tid].numStores(); + } + + return total; +} + +template<class Impl> +int +LSQ<Impl>::numLoadsReady() +{ + unsigned total = 0; + + std::list<unsigned>::iterator active_threads = (*activeThreads).begin(); + + while (active_threads != (*activeThreads).end()) { + unsigned tid = *active_threads++; + total += thread[tid].numLoadsReady(); + } + + return total; +} + +template<class Impl> +unsigned +LSQ<Impl>::numFreeEntries() +{ + unsigned total = 0; + + std::list<unsigned>::iterator active_threads = (*activeThreads).begin(); + + while (active_threads != (*activeThreads).end()) { + unsigned tid = *active_threads++; + total += thread[tid].numFreeEntries(); + } + + return total; +} + +template<class Impl> +unsigned +LSQ<Impl>::numFreeEntries(unsigned tid) +{ + //if( lsqPolicy == Dynamic ) + //return numFreeEntries(); + //else + return thread[tid].numFreeEntries(); +} + +template<class Impl> +bool +LSQ<Impl>::isFull() +{ + std::list<unsigned>::iterator active_threads = (*activeThreads).begin(); + + while (active_threads != (*activeThreads).end()) { + unsigned tid = *active_threads++; + if (! (thread[tid].lqFull() || thread[tid].sqFull()) ) + return false; + } + + return true; +} + +template<class Impl> +bool +LSQ<Impl>::isFull(unsigned tid) +{ + //@todo: Change to Calculate All Entries for + //Dynamic Policy + if( lsqPolicy == Dynamic ) + return isFull(); + else + return thread[tid].lqFull() || thread[tid].sqFull(); +} + +template<class Impl> +bool +LSQ<Impl>::lqFull() +{ + std::list<unsigned>::iterator active_threads = (*activeThreads).begin(); + + while (active_threads != (*activeThreads).end()) { + unsigned tid = *active_threads++; + if (!thread[tid].lqFull()) + return false; + } + + return true; +} + +template<class Impl> +bool +LSQ<Impl>::lqFull(unsigned tid) +{ + //@todo: Change to Calculate All Entries for + //Dynamic Policy + if( lsqPolicy == Dynamic ) + return lqFull(); + else + return thread[tid].lqFull(); +} + +template<class Impl> +bool +LSQ<Impl>::sqFull() +{ + std::list<unsigned>::iterator active_threads = (*activeThreads).begin(); + + while (active_threads != (*activeThreads).end()) { + unsigned tid = *active_threads++; + if (!sqFull(tid)) + return false; + } + + return true; +} + +template<class Impl> +bool +LSQ<Impl>::sqFull(unsigned tid) +{ + //@todo: Change to Calculate All Entries for + //Dynamic Policy + if( lsqPolicy == Dynamic ) + return sqFull(); + else + return thread[tid].sqFull(); +} + +template<class Impl> +bool +LSQ<Impl>::isStalled() +{ + std::list<unsigned>::iterator active_threads = (*activeThreads).begin(); + + while (active_threads != (*activeThreads).end()) { + unsigned tid = *active_threads++; + if (!thread[tid].isStalled()) + return false; + } + + return true; +} + +template<class Impl> +bool +LSQ<Impl>::isStalled(unsigned tid) +{ + if( lsqPolicy == Dynamic ) + return isStalled(); + else + return thread[tid].isStalled(); +} + +template<class Impl> +bool +LSQ<Impl>::hasStoresToWB() +{ + std::list<unsigned>::iterator active_threads = (*activeThreads).begin(); + + if ((*activeThreads).empty()) + return false; + + while (active_threads != (*activeThreads).end()) { + unsigned tid = *active_threads++; + if (!hasStoresToWB(tid)) + return false; + } + + return true; +} + +template<class Impl> +bool +LSQ<Impl>::willWB() +{ + std::list<unsigned>::iterator active_threads = (*activeThreads).begin(); + + while (active_threads != (*activeThreads).end()) { + unsigned tid = *active_threads++; + if (!willWB(tid)) + return false; + } + + return true; +} + +template<class Impl> +void +LSQ<Impl>::dumpInsts() +{ + std::list<unsigned>::iterator active_threads = (*activeThreads).begin(); + + while (active_threads != (*activeThreads).end()) { + unsigned tid = *active_threads++; + thread[tid].dumpInsts(); + } +} diff --git a/src/cpu/o3/lsq_unit.cc b/src/cpu/o3/lsq_unit.cc new file mode 100644 index 000000000..3ca3fa667 --- /dev/null +++ b/src/cpu/o3/lsq_unit.cc @@ -0,0 +1,37 @@ +/* + * Copyright (c) 2004-2006 The Regents of The University of Michigan + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are + * met: redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer; + * redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution; + * neither the name of the copyright holders nor the names of its + * contributors may be used to endorse or promote products derived from + * this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + * Authors: Kevin Lim + * Korey Sewell + */ + +#include "cpu/o3/isa_specific.hh" +#include "cpu/o3/lsq_unit_impl.hh" + +// Force the instantiation of LDSTQ for all the implementations we care about. +template class LSQUnit<O3CPUImpl>; + diff --git a/src/cpu/o3/lsq_unit.hh b/src/cpu/o3/lsq_unit.hh new file mode 100644 index 000000000..8537e9dd7 --- /dev/null +++ b/src/cpu/o3/lsq_unit.hh @@ -0,0 +1,688 @@ +/* + * Copyright (c) 2004-2006 The Regents of The University of Michigan + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are + * met: redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer; + * redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution; + * neither the name of the copyright holders nor the names of its + * contributors may be used to endorse or promote products derived from + * this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + * Authors: Kevin Lim + * Korey Sewell + */ + +#ifndef __CPU_O3_LSQ_UNIT_HH__ +#define __CPU_O3_LSQ_UNIT_HH__ + +#include <algorithm> +#include <map> +#include <queue> + +#include "arch/faults.hh" +#include "config/full_system.hh" +#include "base/hashmap.hh" +#include "cpu/inst_seq.hh" +#include "mem/packet_impl.hh" +#include "mem/port.hh" + +/** + * Class that implements the actual LQ and SQ for each specific + * thread. Both are circular queues; load entries are freed upon + * committing, while store entries are freed once they writeback. The + * LSQUnit tracks if there are memory ordering violations, and also + * detects partial load to store forwarding cases (a store only has + * part of a load's data) that requires the load to wait until the + * store writes back. In the former case it holds onto the instruction + * until the dependence unit looks at it, and in the latter it stalls + * the LSQ until the store writes back. At that point the load is + * replayed. + */ +template <class Impl> +class LSQUnit { + protected: + typedef TheISA::IntReg IntReg; + public: + typedef typename Impl::Params Params; + typedef typename Impl::O3CPU O3CPU; + typedef typename Impl::DynInstPtr DynInstPtr; + typedef typename Impl::CPUPol::IEW IEW; + typedef typename Impl::CPUPol::LSQ LSQ; + typedef typename Impl::CPUPol::IssueStruct IssueStruct; + + public: + /** Constructs an LSQ unit. init() must be called prior to use. */ + LSQUnit(); + + /** Initializes the LSQ unit with the specified number of entries. */ + void init(Params *params, LSQ *lsq_ptr, unsigned maxLQEntries, + unsigned maxSQEntries, unsigned id); + + /** Returns the name of the LSQ unit. */ + std::string name() const; + + /** Registers statistics. */ + void regStats(); + + /** Sets the CPU pointer. */ + void setCPU(O3CPU *cpu_ptr); + + /** Sets the IEW stage pointer. */ + void setIEW(IEW *iew_ptr) + { iewStage = iew_ptr; } + + /** Sets the pointer to the dcache port. */ + void setDcachePort(Port *dcache_port) + { dcachePort = dcache_port; } + + /** Switches out LSQ unit. */ + void switchOut(); + + /** Takes over from another CPU's thread. */ + void takeOverFrom(); + + /** Returns if the LSQ is switched out. */ + bool isSwitchedOut() { return switchedOut; } + + /** Ticks the LSQ unit, which in this case only resets the number of + * used cache ports. + * @todo: Move the number of used ports up to the LSQ level so it can + * be shared by all LSQ units. + */ + void tick() { usedPorts = 0; } + + /** Inserts an instruction. */ + void insert(DynInstPtr &inst); + /** Inserts a load instruction. */ + void insertLoad(DynInstPtr &load_inst); + /** Inserts a store instruction. */ + void insertStore(DynInstPtr &store_inst); + + /** Executes a load instruction. */ + Fault executeLoad(DynInstPtr &inst); + + Fault executeLoad(int lq_idx) { panic("Not implemented"); return NoFault; } + /** Executes a store instruction. */ + Fault executeStore(DynInstPtr &inst); + + /** Commits the head load. */ + void commitLoad(); + /** Commits loads older than a specific sequence number. */ + void commitLoads(InstSeqNum &youngest_inst); + + /** Commits stores older than a specific sequence number. */ + void commitStores(InstSeqNum &youngest_inst); + + /** Writes back stores. */ + void writebackStores(); + + /** Completes the data access that has been returned from the + * memory system. */ + void completeDataAccess(PacketPtr pkt); + + /** Clears all the entries in the LQ. */ + void clearLQ(); + + /** Clears all the entries in the SQ. */ + void clearSQ(); + + /** Resizes the LQ to a given size. */ + void resizeLQ(unsigned size); + + /** Resizes the SQ to a given size. */ + void resizeSQ(unsigned size); + + /** Squashes all instructions younger than a specific sequence number. */ + void squash(const InstSeqNum &squashed_num); + + /** Returns if there is a memory ordering violation. Value is reset upon + * call to getMemDepViolator(). + */ + bool violation() { return memDepViolator; } + + /** Returns the memory ordering violator. */ + DynInstPtr getMemDepViolator(); + + /** Returns if a load became blocked due to the memory system. */ + bool loadBlocked() + { return isLoadBlocked; } + + /** Clears the signal that a load became blocked. */ + void clearLoadBlocked() + { isLoadBlocked = false; } + + /** Returns if the blocked load was handled. */ + bool isLoadBlockedHandled() + { return loadBlockedHandled; } + + /** Records the blocked load as being handled. */ + void setLoadBlockedHandled() + { loadBlockedHandled = true; } + + /** Returns the number of free entries (min of free LQ and SQ entries). */ + unsigned numFreeEntries(); + + /** Returns the number of loads ready to execute. */ + int numLoadsReady(); + + /** Returns the number of loads in the LQ. */ + int numLoads() { return loads; } + + /** Returns the number of stores in the SQ. */ + int numStores() { return stores; } + + /** Returns if either the LQ or SQ is full. */ + bool isFull() { return lqFull() || sqFull(); } + + /** Returns if the LQ is full. */ + bool lqFull() { return loads >= (LQEntries - 1); } + + /** Returns if the SQ is full. */ + bool sqFull() { return stores >= (SQEntries - 1); } + + /** Returns the number of instructions in the LSQ. */ + unsigned getCount() { return loads + stores; } + + /** Returns if there are any stores to writeback. */ + bool hasStoresToWB() { return storesToWB; } + + /** Returns the number of stores to writeback. */ + int numStoresToWB() { return storesToWB; } + + /** Returns if the LSQ unit will writeback on this cycle. */ + bool willWB() { return storeQueue[storeWBIdx].canWB && + !storeQueue[storeWBIdx].completed && + !isStoreBlocked; } + + /** Handles doing the retry. */ + void recvRetry(); + + private: + /** Writes back the instruction, sending it to IEW. */ + void writeback(DynInstPtr &inst, PacketPtr pkt); + + /** Handles completing the send of a store to memory. */ + void storePostSend(Packet *pkt); + + /** Completes the store at the specified index. */ + void completeStore(int store_idx); + + /** Increments the given store index (circular queue). */ + inline void incrStIdx(int &store_idx); + /** Decrements the given store index (circular queue). */ + inline void decrStIdx(int &store_idx); + /** Increments the given load index (circular queue). */ + inline void incrLdIdx(int &load_idx); + /** Decrements the given load index (circular queue). */ + inline void decrLdIdx(int &load_idx); + + public: + /** Debugging function to dump instructions in the LSQ. */ + void dumpInsts(); + + private: + /** Pointer to the CPU. */ + O3CPU *cpu; + + /** Pointer to the IEW stage. */ + IEW *iewStage; + + /** Pointer to the LSQ. */ + LSQ *lsq; + + /** Pointer to the dcache port. Used only for sending. */ + Port *dcachePort; + + /** Derived class to hold any sender state the LSQ needs. */ + class LSQSenderState : public Packet::SenderState + { + public: + /** Default constructor. */ + LSQSenderState() + : noWB(false) + { } + + /** Instruction who initiated the access to memory. */ + DynInstPtr inst; + /** Whether or not it is a load. */ + bool isLoad; + /** The LQ/SQ index of the instruction. */ + int idx; + /** Whether or not the instruction will need to writeback. */ + bool noWB; + }; + + /** Writeback event, specifically for when stores forward data to loads. */ + class WritebackEvent : public Event { + public: + /** Constructs a writeback event. */ + WritebackEvent(DynInstPtr &_inst, PacketPtr pkt, LSQUnit *lsq_ptr); + + /** Processes the writeback event. */ + void process(); + + /** Returns the description of this event. */ + const char *description(); + + private: + /** Instruction whose results are being written back. */ + DynInstPtr inst; + + /** The packet that would have been sent to memory. */ + PacketPtr pkt; + + /** The pointer to the LSQ unit that issued the store. */ + LSQUnit<Impl> *lsqPtr; + }; + + public: + struct SQEntry { + /** Constructs an empty store queue entry. */ + SQEntry() + : inst(NULL), req(NULL), size(0), data(0), + canWB(0), committed(0), completed(0) + { } + + /** Constructs a store queue entry for a given instruction. */ + SQEntry(DynInstPtr &_inst) + : inst(_inst), req(NULL), size(0), data(0), + canWB(0), committed(0), completed(0) + { } + + /** The store instruction. */ + DynInstPtr inst; + /** The request for the store. */ + RequestPtr req; + /** The size of the store. */ + int size; + /** The store data. */ + IntReg data; + /** Whether or not the store can writeback. */ + bool canWB; + /** Whether or not the store is committed. */ + bool committed; + /** Whether or not the store is completed. */ + bool completed; + }; + + private: + /** The LSQUnit thread id. */ + unsigned lsqID; + + /** The store queue. */ + std::vector<SQEntry> storeQueue; + + /** The load queue. */ + std::vector<DynInstPtr> loadQueue; + + /** The number of LQ entries, plus a sentinel entry (circular queue). + * @todo: Consider having var that records the true number of LQ entries. + */ + unsigned LQEntries; + /** The number of SQ entries, plus a sentinel entry (circular queue). + * @todo: Consider having var that records the true number of SQ entries. + */ + unsigned SQEntries; + + /** The number of load instructions in the LQ. */ + int loads; + /** The number of store instructions in the SQ. */ + int stores; + /** The number of store instructions in the SQ waiting to writeback. */ + int storesToWB; + + /** The index of the head instruction in the LQ. */ + int loadHead; + /** The index of the tail instruction in the LQ. */ + int loadTail; + + /** The index of the head instruction in the SQ. */ + int storeHead; + /** The index of the first instruction that may be ready to be + * written back, and has not yet been written back. + */ + int storeWBIdx; + /** The index of the tail instruction in the SQ. */ + int storeTail; + + /// @todo Consider moving to a more advanced model with write vs read ports + /** The number of cache ports available each cycle. */ + int cachePorts; + + /** The number of used cache ports in this cycle. */ + int usedPorts; + + /** Is the LSQ switched out. */ + bool switchedOut; + + //list<InstSeqNum> mshrSeqNums; + + /** Wire to read information from the issue stage time queue. */ + typename TimeBuffer<IssueStruct>::wire fromIssue; + + /** Whether or not the LSQ is stalled. */ + bool stalled; + /** The store that causes the stall due to partial store to load + * forwarding. + */ + InstSeqNum stallingStoreIsn; + /** The index of the above store. */ + int stallingLoadIdx; + + /** The packet that needs to be retried. */ + PacketPtr retryPkt; + + /** Whehter or not a store is blocked due to the memory system. */ + bool isStoreBlocked; + + /** Whether or not a load is blocked due to the memory system. */ + bool isLoadBlocked; + + /** Has the blocked load been handled. */ + bool loadBlockedHandled; + + /** The sequence number of the blocked load. */ + InstSeqNum blockedLoadSeqNum; + + /** The oldest load that caused a memory ordering violation. */ + DynInstPtr memDepViolator; + + // Will also need how many read/write ports the Dcache has. Or keep track + // of that in stage that is one level up, and only call executeLoad/Store + // the appropriate number of times. + /** Total number of loads forwaded from LSQ stores. */ + Stats::Scalar<> lsqForwLoads; + + /** Total number of squashed stores. */ + Stats::Scalar<> lsqSquashedStores; + + /** Total number of software prefetches ignored due to invalid addresses. */ + Stats::Scalar<> invAddrSwpfs; + + /** Ready loads blocked due to partial store-forwarding. */ + Stats::Scalar<> lsqBlockedLoads; + + /** Number of loads that were rescheduled. */ + Stats::Scalar<> lsqRescheduledLoads; + + /** Number of times the LSQ is blocked due to the cache. */ + Stats::Scalar<> lsqCacheBlocked; + + public: + /** Executes the load at the given index. */ + template <class T> + Fault read(Request *req, T &data, int load_idx); + + /** Executes the store at the given index. */ + template <class T> + Fault write(Request *req, T &data, int store_idx); + + /** Returns the index of the head load instruction. */ + int getLoadHead() { return loadHead; } + /** Returns the sequence number of the head load instruction. */ + InstSeqNum getLoadHeadSeqNum() + { + if (loadQueue[loadHead]) { + return loadQueue[loadHead]->seqNum; + } else { + return 0; + } + + } + + /** Returns the index of the head store instruction. */ + int getStoreHead() { return storeHead; } + /** Returns the sequence number of the head store instruction. */ + InstSeqNum getStoreHeadSeqNum() + { + if (storeQueue[storeHead].inst) { + return storeQueue[storeHead].inst->seqNum; + } else { + return 0; + } + + } + + /** Returns whether or not the LSQ unit is stalled. */ + bool isStalled() { return stalled; } +}; + +template <class Impl> +template <class T> +Fault +LSQUnit<Impl>::read(Request *req, T &data, int load_idx) +{ + DynInstPtr load_inst = loadQueue[load_idx]; + + assert(load_inst); + + assert(!load_inst->isExecuted()); + + // Make sure this isn't an uncacheable access + // A bit of a hackish way to get uncached accesses to work only if they're + // at the head of the LSQ and are ready to commit (at the head of the ROB + // too). + if (req->getFlags() & UNCACHEABLE && + (load_idx != loadHead || !load_inst->isAtCommit())) { + iewStage->rescheduleMemInst(load_inst); + ++lsqRescheduledLoads; + return TheISA::genMachineCheckFault(); + } + + // Check the SQ for any previous stores that might lead to forwarding + int store_idx = load_inst->sqIdx; + + int store_size = 0; + + DPRINTF(LSQUnit, "Read called, load idx: %i, store idx: %i, " + "storeHead: %i addr: %#x\n", + load_idx, store_idx, storeHead, req->getPaddr()); + +#if FULL_SYSTEM + if (req->getFlags() & LOCKED) { + cpu->lockAddr = req->getPaddr(); + cpu->lockFlag = true; + } +#endif + + while (store_idx != -1) { + // End once we've reached the top of the LSQ + if (store_idx == storeWBIdx) { + break; + } + + // Move the index to one younger + if (--store_idx < 0) + store_idx += SQEntries; + + assert(storeQueue[store_idx].inst); + + store_size = storeQueue[store_idx].size; + + if (store_size == 0) + continue; + + // Check if the store data is within the lower and upper bounds of + // addresses that the request needs. + bool store_has_lower_limit = + req->getVaddr() >= storeQueue[store_idx].inst->effAddr; + bool store_has_upper_limit = + (req->getVaddr() + req->getSize()) <= + (storeQueue[store_idx].inst->effAddr + store_size); + bool lower_load_has_store_part = + req->getVaddr() < (storeQueue[store_idx].inst->effAddr + + store_size); + bool upper_load_has_store_part = + (req->getVaddr() + req->getSize()) > + storeQueue[store_idx].inst->effAddr; + + // If the store's data has all of the data needed, we can forward. + if (store_has_lower_limit && store_has_upper_limit) { + // Get shift amount for offset into the store's data. + int shift_amt = req->getVaddr() & (store_size - 1); + // @todo: Magic number, assumes byte addressing + shift_amt = shift_amt << 3; + + // Cast this to type T? + data = storeQueue[store_idx].data >> shift_amt; + + assert(!load_inst->memData); + load_inst->memData = new uint8_t[64]; + + memcpy(load_inst->memData, &data, req->getSize()); + + DPRINTF(LSQUnit, "Forwarding from store idx %i to load to " + "addr %#x, data %#x\n", + store_idx, req->getVaddr(), data); + + PacketPtr data_pkt = new Packet(req, Packet::ReadReq, Packet::Broadcast); + data_pkt->dataStatic(load_inst->memData); + + WritebackEvent *wb = new WritebackEvent(load_inst, data_pkt, this); + + // We'll say this has a 1 cycle load-store forwarding latency + // for now. + // @todo: Need to make this a parameter. + wb->schedule(curTick); + + ++lsqForwLoads; + return NoFault; + } else if ((store_has_lower_limit && lower_load_has_store_part) || + (store_has_upper_limit && upper_load_has_store_part) || + (lower_load_has_store_part && upper_load_has_store_part)) { + // This is the partial store-load forwarding case where a store + // has only part of the load's data. + + // If it's already been written back, then don't worry about + // stalling on it. + if (storeQueue[store_idx].completed) { + continue; + } + + // Must stall load and force it to retry, so long as it's the oldest + // load that needs to do so. + if (!stalled || + (stalled && + load_inst->seqNum < + loadQueue[stallingLoadIdx]->seqNum)) { + stalled = true; + stallingStoreIsn = storeQueue[store_idx].inst->seqNum; + stallingLoadIdx = load_idx; + } + + // Tell IQ/mem dep unit that this instruction will need to be + // rescheduled eventually + iewStage->rescheduleMemInst(load_inst); + iewStage->decrWb(load_inst->seqNum); + ++lsqRescheduledLoads; + + // Do not generate a writeback event as this instruction is not + // complete. + DPRINTF(LSQUnit, "Load-store forwarding mis-match. " + "Store idx %i to load addr %#x\n", + store_idx, req->getVaddr()); + + ++lsqBlockedLoads; + return NoFault; + } + } + + // If there's no forwarding case, then go access memory + DPRINTF(LSQUnit, "Doing memory access for inst [sn:%lli] PC %#x\n", + load_inst->seqNum, load_inst->readPC()); + + assert(!load_inst->memData); + load_inst->memData = new uint8_t[64]; + + ++usedPorts; + + PacketPtr data_pkt = new Packet(req, Packet::ReadReq, Packet::Broadcast); + data_pkt->dataStatic(load_inst->memData); + + LSQSenderState *state = new LSQSenderState; + state->isLoad = true; + state->idx = load_idx; + state->inst = load_inst; + data_pkt->senderState = state; + + // if we the cache is not blocked, do cache access + if (!lsq->cacheBlocked()) { + if (!dcachePort->sendTiming(data_pkt)) { + // If the access didn't succeed, tell the LSQ by setting + // the retry thread id. + lsq->setRetryTid(lsqID); + } + } + + // If the cache was blocked, or has become blocked due to the access, + // handle it. + if (lsq->cacheBlocked()) { + ++lsqCacheBlocked; + + iewStage->decrWb(load_inst->seqNum); + // There's an older load that's already going to squash. + if (isLoadBlocked && blockedLoadSeqNum < load_inst->seqNum) + return NoFault; + + // Record that the load was blocked due to memory. This + // load will squash all instructions after it, be + // refetched, and re-executed. + isLoadBlocked = true; + loadBlockedHandled = false; + blockedLoadSeqNum = load_inst->seqNum; + // No fault occurred, even though the interface is blocked. + return NoFault; + } + + if (data_pkt->result != Packet::Success) { + DPRINTF(LSQUnit, "LSQUnit: D-cache miss!\n"); + DPRINTF(Activity, "Activity: ld accessing mem miss [sn:%lli]\n", + load_inst->seqNum); + } else { + DPRINTF(LSQUnit, "LSQUnit: D-cache hit!\n"); + DPRINTF(Activity, "Activity: ld accessing mem hit [sn:%lli]\n", + load_inst->seqNum); + } + + return NoFault; +} + +template <class Impl> +template <class T> +Fault +LSQUnit<Impl>::write(Request *req, T &data, int store_idx) +{ + assert(storeQueue[store_idx].inst); + + DPRINTF(LSQUnit, "Doing write to store idx %i, addr %#x data %#x" + " | storeHead:%i [sn:%i]\n", + store_idx, req->getPaddr(), data, storeHead, + storeQueue[store_idx].inst->seqNum); + + storeQueue[store_idx].req = req; + storeQueue[store_idx].size = sizeof(T); + storeQueue[store_idx].data = data; + + // This function only writes the data to the store queue, so no fault + // can happen here. + return NoFault; +} + +#endif // __CPU_O3_LSQ_UNIT_HH__ diff --git a/src/cpu/o3/lsq_unit_impl.hh b/src/cpu/o3/lsq_unit_impl.hh new file mode 100644 index 000000000..2922b81bd --- /dev/null +++ b/src/cpu/o3/lsq_unit_impl.hh @@ -0,0 +1,959 @@ +/* + * Copyright (c) 2004-2005 The Regents of The University of Michigan + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are + * met: redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer; + * redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution; + * neither the name of the copyright holders nor the names of its + * contributors may be used to endorse or promote products derived from + * this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + * Authors: Kevin Lim + * Korey Sewell + */ + +#include "config/use_checker.hh" + +#include "cpu/o3/lsq.hh" +#include "cpu/o3/lsq_unit.hh" +#include "base/str.hh" +#include "mem/packet.hh" +#include "mem/request.hh" + +#if USE_CHECKER +#include "cpu/checker/cpu.hh" +#endif + +template<class Impl> +LSQUnit<Impl>::WritebackEvent::WritebackEvent(DynInstPtr &_inst, PacketPtr _pkt, + LSQUnit *lsq_ptr) + : Event(&mainEventQueue), inst(_inst), pkt(_pkt), lsqPtr(lsq_ptr) +{ + this->setFlags(Event::AutoDelete); +} + +template<class Impl> +void +LSQUnit<Impl>::WritebackEvent::process() +{ + if (!lsqPtr->isSwitchedOut()) { + lsqPtr->writeback(inst, pkt); + } + delete pkt; +} + +template<class Impl> +const char * +LSQUnit<Impl>::WritebackEvent::description() +{ + return "Store writeback event"; +} + +template<class Impl> +void +LSQUnit<Impl>::completeDataAccess(PacketPtr pkt) +{ + LSQSenderState *state = dynamic_cast<LSQSenderState *>(pkt->senderState); + DynInstPtr inst = state->inst; + DPRINTF(IEW, "Writeback event [sn:%lli]\n", inst->seqNum); + DPRINTF(Activity, "Activity: Writeback event [sn:%lli]\n", inst->seqNum); + + //iewStage->ldstQueue.removeMSHR(inst->threadNumber,inst->seqNum); + + if (isSwitchedOut() || inst->isSquashed()) { + iewStage->decrWb(inst->seqNum); + delete state; + delete pkt; + return; + } else { + if (!state->noWB) { + writeback(inst, pkt); + } + + if (inst->isStore()) { + completeStore(state->idx); + } + } + + delete state; + delete pkt; +} + +template <class Impl> +LSQUnit<Impl>::LSQUnit() + : loads(0), stores(0), storesToWB(0), stalled(false), + isStoreBlocked(false), isLoadBlocked(false), + loadBlockedHandled(false) +{ +} + +template<class Impl> +void +LSQUnit<Impl>::init(Params *params, LSQ *lsq_ptr, unsigned maxLQEntries, + unsigned maxSQEntries, unsigned id) +{ + DPRINTF(LSQUnit, "Creating LSQUnit%i object.\n",id); + + switchedOut = false; + + lsq = lsq_ptr; + + lsqID = id; + + // Add 1 for the sentinel entry (they are circular queues). + LQEntries = maxLQEntries + 1; + SQEntries = maxSQEntries + 1; + + loadQueue.resize(LQEntries); + storeQueue.resize(SQEntries); + + loadHead = loadTail = 0; + + storeHead = storeWBIdx = storeTail = 0; + + usedPorts = 0; + cachePorts = params->cachePorts; + + memDepViolator = NULL; + + blockedLoadSeqNum = 0; +} + +template<class Impl> +void +LSQUnit<Impl>::setCPU(O3CPU *cpu_ptr) +{ + cpu = cpu_ptr; + +#if USE_CHECKER + if (cpu->checker) { + cpu->checker->setDcachePort(dcachePort); + } +#endif +} + +template<class Impl> +std::string +LSQUnit<Impl>::name() const +{ + if (Impl::MaxThreads == 1) { + return iewStage->name() + ".lsq"; + } else { + return iewStage->name() + ".lsq.thread." + to_string(lsqID); + } +} + +template<class Impl> +void +LSQUnit<Impl>::regStats() +{ + lsqForwLoads + .name(name() + ".forwLoads") + .desc("Number of loads that had data forwarded from stores"); + + invAddrLoads + .name(name() + ".invAddrLoads") + .desc("Number of loads ignored due to an invalid address"); + + lsqSquashedLoads + .name(name() + ".squashedLoads") + .desc("Number of loads squashed"); + + lsqIgnoredResponses + .name(name() + ".ignoredResponses") + .desc("Number of memory responses ignored because the instruction is squashed"); + + lsqMemOrderViolation + .name(name() + ".memOrderViolation") + .desc("Number of memory ordering violations"); + + lsqSquashedStores + .name(name() + ".squashedStores") + .desc("Number of stores squashed"); + + invAddrSwpfs + .name(name() + ".invAddrSwpfs") + .desc("Number of software prefetches ignored due to an invalid address"); + + lsqBlockedLoads + .name(name() + ".blockedLoads") + .desc("Number of blocked loads due to partial load-store forwarding"); + + lsqRescheduledLoads + .name(name() + ".rescheduledLoads") + .desc("Number of loads that were rescheduled"); + + lsqCacheBlocked + .name(name() + ".cacheBlocked") + .desc("Number of times an access to memory failed due to the cache being blocked"); +} + +template<class Impl> +void +LSQUnit<Impl>::clearLQ() +{ + loadQueue.clear(); +} + +template<class Impl> +void +LSQUnit<Impl>::clearSQ() +{ + storeQueue.clear(); +} + +template<class Impl> +void +LSQUnit<Impl>::switchOut() +{ + switchedOut = true; + for (int i = 0; i < loadQueue.size(); ++i) { + assert(!loadQueue[i]); + loadQueue[i] = NULL; + } + + assert(storesToWB == 0); +} + +template<class Impl> +void +LSQUnit<Impl>::takeOverFrom() +{ + switchedOut = false; + loads = stores = storesToWB = 0; + + loadHead = loadTail = 0; + + storeHead = storeWBIdx = storeTail = 0; + + usedPorts = 0; + + memDepViolator = NULL; + + blockedLoadSeqNum = 0; + + stalled = false; + isLoadBlocked = false; + loadBlockedHandled = false; +} + +template<class Impl> +void +LSQUnit<Impl>::resizeLQ(unsigned size) +{ + unsigned size_plus_sentinel = size + 1; + assert(size_plus_sentinel >= LQEntries); + + if (size_plus_sentinel > LQEntries) { + while (size_plus_sentinel > loadQueue.size()) { + DynInstPtr dummy; + loadQueue.push_back(dummy); + LQEntries++; + } + } else { + LQEntries = size_plus_sentinel; + } + +} + +template<class Impl> +void +LSQUnit<Impl>::resizeSQ(unsigned size) +{ + unsigned size_plus_sentinel = size + 1; + if (size_plus_sentinel > SQEntries) { + while (size_plus_sentinel > storeQueue.size()) { + SQEntry dummy; + storeQueue.push_back(dummy); + SQEntries++; + } + } else { + SQEntries = size_plus_sentinel; + } +} + +template <class Impl> +void +LSQUnit<Impl>::insert(DynInstPtr &inst) +{ + assert(inst->isMemRef()); + + assert(inst->isLoad() || inst->isStore()); + + if (inst->isLoad()) { + insertLoad(inst); + } else { + insertStore(inst); + } + + inst->setInLSQ(); +} + +template <class Impl> +void +LSQUnit<Impl>::insertLoad(DynInstPtr &load_inst) +{ + assert((loadTail + 1) % LQEntries != loadHead); + assert(loads < LQEntries); + + DPRINTF(LSQUnit, "Inserting load PC %#x, idx:%i [sn:%lli]\n", + load_inst->readPC(), loadTail, load_inst->seqNum); + + load_inst->lqIdx = loadTail; + + if (stores == 0) { + load_inst->sqIdx = -1; + } else { + load_inst->sqIdx = storeTail; + } + + loadQueue[loadTail] = load_inst; + + incrLdIdx(loadTail); + + ++loads; +} + +template <class Impl> +void +LSQUnit<Impl>::insertStore(DynInstPtr &store_inst) +{ + // Make sure it is not full before inserting an instruction. + assert((storeTail + 1) % SQEntries != storeHead); + assert(stores < SQEntries); + + DPRINTF(LSQUnit, "Inserting store PC %#x, idx:%i [sn:%lli]\n", + store_inst->readPC(), storeTail, store_inst->seqNum); + + store_inst->sqIdx = storeTail; + store_inst->lqIdx = loadTail; + + storeQueue[storeTail] = SQEntry(store_inst); + + incrStIdx(storeTail); + + ++stores; +} + +template <class Impl> +typename Impl::DynInstPtr +LSQUnit<Impl>::getMemDepViolator() +{ + DynInstPtr temp = memDepViolator; + + memDepViolator = NULL; + + return temp; +} + +template <class Impl> +unsigned +LSQUnit<Impl>::numFreeEntries() +{ + unsigned free_lq_entries = LQEntries - loads; + unsigned free_sq_entries = SQEntries - stores; + + // Both the LQ and SQ entries have an extra dummy entry to differentiate + // empty/full conditions. Subtract 1 from the free entries. + if (free_lq_entries < free_sq_entries) { + return free_lq_entries - 1; + } else { + return free_sq_entries - 1; + } +} + +template <class Impl> +int +LSQUnit<Impl>::numLoadsReady() +{ + int load_idx = loadHead; + int retval = 0; + + while (load_idx != loadTail) { + assert(loadQueue[load_idx]); + + if (loadQueue[load_idx]->readyToIssue()) { + ++retval; + } + } + + return retval; +} + +template <class Impl> +Fault +LSQUnit<Impl>::executeLoad(DynInstPtr &inst) +{ + // Execute a specific load. + Fault load_fault = NoFault; + + DPRINTF(LSQUnit, "Executing load PC %#x, [sn:%lli]\n", + inst->readPC(),inst->seqNum); + + load_fault = inst->initiateAcc(); + + // If the instruction faulted, then we need to send it along to commit + // without the instruction completing. + if (load_fault != NoFault) { + // Send this instruction to commit, also make sure iew stage + // realizes there is activity. + // Mark it as executed unless it is an uncached load that + // needs to hit the head of commit. + if (!(inst->req->flags & UNCACHEABLE) || inst->isAtCommit()) { + inst->setExecuted(); + } + iewStage->instToCommit(inst); + iewStage->activityThisCycle(); + } + + return load_fault; +} + +template <class Impl> +Fault +LSQUnit<Impl>::executeStore(DynInstPtr &store_inst) +{ + using namespace TheISA; + // Make sure that a store exists. + assert(stores != 0); + + int store_idx = store_inst->sqIdx; + + DPRINTF(LSQUnit, "Executing store PC %#x [sn:%lli]\n", + store_inst->readPC(), store_inst->seqNum); + + // Check the recently completed loads to see if any match this store's + // address. If so, then we have a memory ordering violation. + int load_idx = store_inst->lqIdx; + + Fault store_fault = store_inst->initiateAcc(); + + if (storeQueue[store_idx].size == 0) { + DPRINTF(LSQUnit,"Fault on Store PC %#x, [sn:%lli],Size = 0\n", + store_inst->readPC(),store_inst->seqNum); + + return store_fault; + } + + assert(store_fault == NoFault); + + if (store_inst->isStoreConditional()) { + // Store conditionals need to set themselves as able to + // writeback if we haven't had a fault by here. + storeQueue[store_idx].canWB = true; + + ++storesToWB; + } + + if (!memDepViolator) { + while (load_idx != loadTail) { + // Really only need to check loads that have actually executed + // It's safe to check all loads because effAddr is set to + // InvalAddr when the dyn inst is created. + + // @todo: For now this is extra conservative, detecting a + // violation if the addresses match assuming all accesses + // are quad word accesses. + + // @todo: Fix this, magic number being used here + if ((loadQueue[load_idx]->effAddr >> 8) == + (store_inst->effAddr >> 8)) { + // A load incorrectly passed this store. Squash and refetch. + // For now return a fault to show that it was unsuccessful. + memDepViolator = loadQueue[load_idx]; + ++lsqMemOrderViolation; + + return genMachineCheckFault(); + } + + incrLdIdx(load_idx); + } + + // If we've reached this point, there was no violation. + memDepViolator = NULL; + } + + return store_fault; +} + +template <class Impl> +void +LSQUnit<Impl>::commitLoad() +{ + assert(loadQueue[loadHead]); + + DPRINTF(LSQUnit, "Committing head load instruction, PC %#x\n", + loadQueue[loadHead]->readPC()); + + loadQueue[loadHead] = NULL; + + incrLdIdx(loadHead); + + --loads; +} + +template <class Impl> +void +LSQUnit<Impl>::commitLoads(InstSeqNum &youngest_inst) +{ + assert(loads == 0 || loadQueue[loadHead]); + + while (loads != 0 && loadQueue[loadHead]->seqNum <= youngest_inst) { + commitLoad(); + } +} + +template <class Impl> +void +LSQUnit<Impl>::commitStores(InstSeqNum &youngest_inst) +{ + assert(stores == 0 || storeQueue[storeHead].inst); + + int store_idx = storeHead; + + while (store_idx != storeTail) { + assert(storeQueue[store_idx].inst); + // Mark any stores that are now committed and have not yet + // been marked as able to write back. + if (!storeQueue[store_idx].canWB) { + if (storeQueue[store_idx].inst->seqNum > youngest_inst) { + break; + } + DPRINTF(LSQUnit, "Marking store as able to write back, PC " + "%#x [sn:%lli]\n", + storeQueue[store_idx].inst->readPC(), + storeQueue[store_idx].inst->seqNum); + + storeQueue[store_idx].canWB = true; + + ++storesToWB; + } + + incrStIdx(store_idx); + } +} + +template <class Impl> +void +LSQUnit<Impl>::writebackStores() +{ + while (storesToWB > 0 && + storeWBIdx != storeTail && + storeQueue[storeWBIdx].inst && + storeQueue[storeWBIdx].canWB && + usedPorts < cachePorts) { + + if (isStoreBlocked || lsq->cacheBlocked()) { + DPRINTF(LSQUnit, "Unable to write back any more stores, cache" + " is blocked!\n"); + break; + } + + // Store didn't write any data so no need to write it back to + // memory. + if (storeQueue[storeWBIdx].size == 0) { + completeStore(storeWBIdx); + + incrStIdx(storeWBIdx); + + continue; + } + + ++usedPorts; + + if (storeQueue[storeWBIdx].inst->isDataPrefetch()) { + incrStIdx(storeWBIdx); + + continue; + } + + assert(storeQueue[storeWBIdx].req); + assert(!storeQueue[storeWBIdx].committed); + + DynInstPtr inst = storeQueue[storeWBIdx].inst; + + Request *req = storeQueue[storeWBIdx].req; + storeQueue[storeWBIdx].committed = true; + + assert(!inst->memData); + inst->memData = new uint8_t[64]; + memcpy(inst->memData, (uint8_t *)&storeQueue[storeWBIdx].data, + req->getSize()); + + PacketPtr data_pkt = new Packet(req, Packet::WriteReq, Packet::Broadcast); + data_pkt->dataStatic(inst->memData); + + LSQSenderState *state = new LSQSenderState; + state->isLoad = false; + state->idx = storeWBIdx; + state->inst = inst; + data_pkt->senderState = state; + + DPRINTF(LSQUnit, "D-Cache: Writing back store idx:%i PC:%#x " + "to Addr:%#x, data:%#x [sn:%lli]\n", + storeWBIdx, storeQueue[storeWBIdx].inst->readPC(), + req->getPaddr(), *(inst->memData), + storeQueue[storeWBIdx].inst->seqNum); + + // @todo: Remove this SC hack once the memory system handles it. + if (req->getFlags() & LOCKED) { + if (req->getFlags() & UNCACHEABLE) { + req->setScResult(2); + } else { + if (cpu->lockFlag) { + req->setScResult(1); + } else { + req->setScResult(0); + // Hack: Instantly complete this store. + completeDataAccess(data_pkt); + incrStIdx(storeWBIdx); + continue; + } + } + } else { + // Non-store conditionals do not need a writeback. + state->noWB = true; + } + + if (!dcachePort->sendTiming(data_pkt)) { + // Need to handle becoming blocked on a store. + isStoreBlocked = true; + ++lsqCacheBlocked; + assert(retryPkt == NULL); + retryPkt = data_pkt; + lsq->setRetryTid(lsqID); + } else { + storePostSend(data_pkt); + } + } + + // Not sure this should set it to 0. + usedPorts = 0; + + assert(stores >= 0 && storesToWB >= 0); +} + +/*template <class Impl> +void +LSQUnit<Impl>::removeMSHR(InstSeqNum seqNum) +{ + list<InstSeqNum>::iterator mshr_it = find(mshrSeqNums.begin(), + mshrSeqNums.end(), + seqNum); + + if (mshr_it != mshrSeqNums.end()) { + mshrSeqNums.erase(mshr_it); + DPRINTF(LSQUnit, "Removing MSHR. count = %i\n",mshrSeqNums.size()); + } +}*/ + +template <class Impl> +void +LSQUnit<Impl>::squash(const InstSeqNum &squashed_num) +{ + DPRINTF(LSQUnit, "Squashing until [sn:%lli]!" + "(Loads:%i Stores:%i)\n", squashed_num, loads, stores); + + int load_idx = loadTail; + decrLdIdx(load_idx); + + while (loads != 0 && loadQueue[load_idx]->seqNum > squashed_num) { + DPRINTF(LSQUnit,"Load Instruction PC %#x squashed, " + "[sn:%lli]\n", + loadQueue[load_idx]->readPC(), + loadQueue[load_idx]->seqNum); + + if (isStalled() && load_idx == stallingLoadIdx) { + stalled = false; + stallingStoreIsn = 0; + stallingLoadIdx = 0; + } + + // Clear the smart pointer to make sure it is decremented. + loadQueue[load_idx]->setSquashed(); + loadQueue[load_idx] = NULL; + --loads; + + // Inefficient! + loadTail = load_idx; + + decrLdIdx(load_idx); + ++lsqSquashedLoads; + } + + if (isLoadBlocked) { + if (squashed_num < blockedLoadSeqNum) { + isLoadBlocked = false; + loadBlockedHandled = false; + blockedLoadSeqNum = 0; + } + } + + int store_idx = storeTail; + decrStIdx(store_idx); + + while (stores != 0 && + storeQueue[store_idx].inst->seqNum > squashed_num) { + // Instructions marked as can WB are already committed. + if (storeQueue[store_idx].canWB) { + break; + } + + DPRINTF(LSQUnit,"Store Instruction PC %#x squashed, " + "idx:%i [sn:%lli]\n", + storeQueue[store_idx].inst->readPC(), + store_idx, storeQueue[store_idx].inst->seqNum); + + // I don't think this can happen. It should have been cleared + // by the stalling load. + if (isStalled() && + storeQueue[store_idx].inst->seqNum == stallingStoreIsn) { + panic("Is stalled should have been cleared by stalling load!\n"); + stalled = false; + stallingStoreIsn = 0; + } + + // Clear the smart pointer to make sure it is decremented. + storeQueue[store_idx].inst->setSquashed(); + storeQueue[store_idx].inst = NULL; + storeQueue[store_idx].canWB = 0; + + storeQueue[store_idx].req = NULL; + --stores; + + // Inefficient! + storeTail = store_idx; + + decrStIdx(store_idx); + ++lsqSquashedStores; + } +} + +template <class Impl> +void +LSQUnit<Impl>::storePostSend(Packet *pkt) +{ + if (isStalled() && + storeQueue[storeWBIdx].inst->seqNum == stallingStoreIsn) { + DPRINTF(LSQUnit, "Unstalling, stalling store [sn:%lli] " + "load idx:%i\n", + stallingStoreIsn, stallingLoadIdx); + stalled = false; + stallingStoreIsn = 0; + iewStage->replayMemInst(loadQueue[stallingLoadIdx]); + } + + if (!storeQueue[storeWBIdx].inst->isStoreConditional()) { + // The store is basically completed at this time. This + // only works so long as the checker doesn't try to + // verify the value in memory for stores. + storeQueue[storeWBIdx].inst->setCompleted(); +#if USE_CHECKER + if (cpu->checker) { + cpu->checker->verify(storeQueue[storeWBIdx].inst); + } +#endif + } + + if (pkt->result != Packet::Success) { + DPRINTF(LSQUnit,"D-Cache Write Miss on idx:%i!\n", + storeWBIdx); + + DPRINTF(Activity, "Active st accessing mem miss [sn:%lli]\n", + storeQueue[storeWBIdx].inst->seqNum); + + //mshrSeqNums.push_back(storeQueue[storeWBIdx].inst->seqNum); + + //DPRINTF(LSQUnit, "Added MSHR. count = %i\n",mshrSeqNums.size()); + + // @todo: Increment stat here. + } else { + DPRINTF(LSQUnit,"D-Cache: Write Hit on idx:%i !\n", + storeWBIdx); + + DPRINTF(Activity, "Active st accessing mem hit [sn:%lli]\n", + storeQueue[storeWBIdx].inst->seqNum); + } + + incrStIdx(storeWBIdx); +} + +template <class Impl> +void +LSQUnit<Impl>::writeback(DynInstPtr &inst, PacketPtr pkt) +{ + iewStage->wakeCPU(); + + // Squashed instructions do not need to complete their access. + if (inst->isSquashed()) { + iewStage->decrWb(inst->seqNum); + assert(!inst->isStore()); + ++lsqIgnoredResponses; + return; + } + + if (!inst->isExecuted()) { + inst->setExecuted(); + + // Complete access to copy data to proper place. + inst->completeAcc(pkt); + } + + // Need to insert instruction into queue to commit + iewStage->instToCommit(inst); + + iewStage->activityThisCycle(); +} + +template <class Impl> +void +LSQUnit<Impl>::completeStore(int store_idx) +{ + assert(storeQueue[store_idx].inst); + storeQueue[store_idx].completed = true; + --storesToWB; + // A bit conservative because a store completion may not free up entries, + // but hopefully avoids two store completions in one cycle from making + // the CPU tick twice. + cpu->activityThisCycle(); + + if (store_idx == storeHead) { + do { + incrStIdx(storeHead); + + --stores; + } while (storeQueue[storeHead].completed && + storeHead != storeTail); + + iewStage->updateLSQNextCycle = true; + } + + DPRINTF(LSQUnit, "Completing store [sn:%lli], idx:%i, store head " + "idx:%i\n", + storeQueue[store_idx].inst->seqNum, store_idx, storeHead); + + if (isStalled() && + storeQueue[store_idx].inst->seqNum == stallingStoreIsn) { + DPRINTF(LSQUnit, "Unstalling, stalling store [sn:%lli] " + "load idx:%i\n", + stallingStoreIsn, stallingLoadIdx); + stalled = false; + stallingStoreIsn = 0; + iewStage->replayMemInst(loadQueue[stallingLoadIdx]); + } + + storeQueue[store_idx].inst->setCompleted(); + + // Tell the checker we've completed this instruction. Some stores + // may get reported twice to the checker, but the checker can + // handle that case. +#if USE_CHECKER + if (cpu->checker) { + cpu->checker->verify(storeQueue[store_idx].inst); + } +#endif +} + +template <class Impl> +void +LSQUnit<Impl>::recvRetry() +{ + if (isStoreBlocked) { + assert(retryPkt != NULL); + + if (dcachePort->sendTiming(retryPkt)) { + storePostSend(retryPkt); + retryPkt = NULL; + isStoreBlocked = false; + lsq->setRetryTid(-1); + } else { + // Still blocked! + ++lsqCacheBlocked; + lsq->setRetryTid(lsqID); + } + } else if (isLoadBlocked) { + DPRINTF(LSQUnit, "Loads squash themselves and all younger insts, " + "no need to resend packet.\n"); + } else { + DPRINTF(LSQUnit, "Retry received but LSQ is no longer blocked.\n"); + } +} + +template <class Impl> +inline void +LSQUnit<Impl>::incrStIdx(int &store_idx) +{ + if (++store_idx >= SQEntries) + store_idx = 0; +} + +template <class Impl> +inline void +LSQUnit<Impl>::decrStIdx(int &store_idx) +{ + if (--store_idx < 0) + store_idx += SQEntries; +} + +template <class Impl> +inline void +LSQUnit<Impl>::incrLdIdx(int &load_idx) +{ + if (++load_idx >= LQEntries) + load_idx = 0; +} + +template <class Impl> +inline void +LSQUnit<Impl>::decrLdIdx(int &load_idx) +{ + if (--load_idx < 0) + load_idx += LQEntries; +} + +template <class Impl> +void +LSQUnit<Impl>::dumpInsts() +{ + cprintf("Load store queue: Dumping instructions.\n"); + cprintf("Load queue size: %i\n", loads); + cprintf("Load queue: "); + + int load_idx = loadHead; + + while (load_idx != loadTail && loadQueue[load_idx]) { + cprintf("%#x ", loadQueue[load_idx]->readPC()); + + incrLdIdx(load_idx); + } + + cprintf("Store queue size: %i\n", stores); + cprintf("Store queue: "); + + int store_idx = storeHead; + + while (store_idx != storeTail && storeQueue[store_idx].inst) { + cprintf("%#x ", storeQueue[store_idx].inst->readPC()); + + incrStIdx(store_idx); + } + + cprintf("\n"); +} diff --git a/src/cpu/o3/mem_dep_unit.cc b/src/cpu/o3/mem_dep_unit.cc new file mode 100644 index 000000000..6a14dcbff --- /dev/null +++ b/src/cpu/o3/mem_dep_unit.cc @@ -0,0 +1,49 @@ +/* + * Copyright (c) 2004-2005 The Regents of The University of Michigan + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are + * met: redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer; + * redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution; + * neither the name of the copyright holders nor the names of its + * contributors may be used to endorse or promote products derived from + * this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + * Authors: Kevin Lim + */ + +#include "cpu/o3/isa_specific.hh" +#include "cpu/o3/store_set.hh" +#include "cpu/o3/mem_dep_unit_impl.hh" + +// Force instantation of memory dependency unit using store sets and +// O3CPUImpl. +template class MemDepUnit<StoreSet, O3CPUImpl>; + +#ifdef DEBUG +template <> +int +MemDepUnit<StoreSet, O3CPUImpl>::MemDepEntry::memdep_count = 0; +template <> +int +MemDepUnit<StoreSet, O3CPUImpl>::MemDepEntry::memdep_insert = 0; +template <> +int +MemDepUnit<StoreSet, O3CPUImpl>::MemDepEntry::memdep_erase = 0; +#endif diff --git a/src/cpu/o3/mem_dep_unit.hh b/src/cpu/o3/mem_dep_unit.hh new file mode 100644 index 000000000..e399f0133 --- /dev/null +++ b/src/cpu/o3/mem_dep_unit.hh @@ -0,0 +1,264 @@ +/* + * Copyright (c) 2004-2006 The Regents of The University of Michigan + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are + * met: redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer; + * redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution; + * neither the name of the copyright holders nor the names of its + * contributors may be used to endorse or promote products derived from + * this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + * Authors: Kevin Lim + */ + +#ifndef __CPU_O3_MEM_DEP_UNIT_HH__ +#define __CPU_O3_MEM_DEP_UNIT_HH__ + +#include <list> +#include <set> + +#include "base/hashmap.hh" +#include "base/refcnt.hh" +#include "base/statistics.hh" +#include "cpu/inst_seq.hh" + +struct SNHash { + size_t operator() (const InstSeqNum &seq_num) const { + unsigned a = (unsigned)seq_num; + unsigned hash = (((a >> 14) ^ ((a >> 2) & 0xffff))) & 0x7FFFFFFF; + + return hash; + } +}; + +template <class Impl> +class InstructionQueue; + +/** + * Memory dependency unit class. This holds the memory dependence predictor. + * As memory operations are issued to the IQ, they are also issued to this + * unit, which then looks up the prediction as to what they are dependent + * upon. This unit must be checked prior to a memory operation being able + * to issue. Although this is templated, it's somewhat hard to make a generic + * memory dependence unit. This one is mostly for store sets; it will be + * quite limited in what other memory dependence predictions it can also + * utilize. Thus this class should be most likely be rewritten for other + * dependence prediction schemes. + */ +template <class MemDepPred, class Impl> +class MemDepUnit { + public: + typedef typename Impl::Params Params; + typedef typename Impl::DynInstPtr DynInstPtr; + + /** Empty constructor. Must call init() prior to using in this case. */ + MemDepUnit() {} + + /** Constructs a MemDepUnit with given parameters. */ + MemDepUnit(Params *params); + + /** Frees up any memory allocated. */ + ~MemDepUnit(); + + /** Returns the name of the memory dependence unit. */ + std::string name() const; + + /** Initializes the unit with parameters and a thread id. */ + void init(Params *params, int tid); + + /** Registers statistics. */ + void regStats(); + + /** Switches out the memory dependence predictor. */ + void switchOut(); + + /** Takes over from another CPU's thread. */ + void takeOverFrom(); + + /** Sets the pointer to the IQ. */ + void setIQ(InstructionQueue<Impl> *iq_ptr); + + /** Inserts a memory instruction. */ + void insert(DynInstPtr &inst); + + /** Inserts a non-speculative memory instruction. */ + void insertNonSpec(DynInstPtr &inst); + + /** Inserts a barrier instruction. */ + void insertBarrier(DynInstPtr &barr_inst); + + /** Indicate that an instruction has its registers ready. */ + void regsReady(DynInstPtr &inst); + + /** Indicate that a non-speculative instruction is ready. */ + void nonSpecInstReady(DynInstPtr &inst); + + /** Reschedules an instruction to be re-executed. */ + void reschedule(DynInstPtr &inst); + + /** Replays all instructions that have been rescheduled by moving them to + * the ready list. + */ + void replay(DynInstPtr &inst); + + /** Completes a memory instruction. */ + void completed(DynInstPtr &inst); + + /** Completes a barrier instruction. */ + void completeBarrier(DynInstPtr &inst); + + /** Wakes any dependents of a memory instruction. */ + void wakeDependents(DynInstPtr &inst); + + /** Squashes all instructions up until a given sequence number for a + * specific thread. + */ + void squash(const InstSeqNum &squashed_num, unsigned tid); + + /** Indicates an ordering violation between a store and a younger load. */ + void violation(DynInstPtr &store_inst, DynInstPtr &violating_load); + + /** Issues the given instruction */ + void issue(DynInstPtr &inst); + + /** Debugging function to dump the lists of instructions. */ + void dumpLists(); + + private: + typedef typename std::list<DynInstPtr>::iterator ListIt; + + class MemDepEntry; + + typedef RefCountingPtr<MemDepEntry> MemDepEntryPtr; + + /** Memory dependence entries that track memory operations, marking + * when the instruction is ready to execute and what instructions depend + * upon it. + */ + class MemDepEntry : public RefCounted { + public: + /** Constructs a memory dependence entry. */ + MemDepEntry(DynInstPtr &new_inst) + : inst(new_inst), regsReady(false), memDepReady(false), + completed(false), squashed(false) + { +#ifdef DEBUG + ++memdep_count; + + DPRINTF(MemDepUnit, "Memory dependency entry created. " + "memdep_count=%i\n", memdep_count); +#endif + } + + /** Frees any pointers. */ + ~MemDepEntry() + { + for (int i = 0; i < dependInsts.size(); ++i) { + dependInsts[i] = NULL; + } +#ifdef DEBUG + --memdep_count; + + DPRINTF(MemDepUnit, "Memory dependency entry deleted. " + "memdep_count=%i\n", memdep_count); +#endif + } + + /** Returns the name of the memory dependence entry. */ + std::string name() const { return "memdepentry"; } + + /** The instruction being tracked. */ + DynInstPtr inst; + + /** The iterator to the instruction's location inside the list. */ + ListIt listIt; + + /** A vector of any dependent instructions. */ + std::vector<MemDepEntryPtr> dependInsts; + + /** If the registers are ready or not. */ + bool regsReady; + /** If all memory dependencies have been satisfied. */ + bool memDepReady; + /** If the instruction is completed. */ + bool completed; + /** If the instruction is squashed. */ + bool squashed; + + /** For debugging. */ +#ifdef DEBUG + static int memdep_count; + static int memdep_insert; + static int memdep_erase; +#endif + }; + + /** Finds the memory dependence entry in the hash map. */ + inline MemDepEntryPtr &findInHash(const DynInstPtr &inst); + + /** Moves an entry to the ready list. */ + inline void moveToReady(MemDepEntryPtr &ready_inst_entry); + + typedef m5::hash_map<InstSeqNum, MemDepEntryPtr, SNHash> MemDepHash; + + typedef typename MemDepHash::iterator MemDepHashIt; + + /** A hash map of all memory dependence entries. */ + MemDepHash memDepHash; + + /** A list of all instructions in the memory dependence unit. */ + std::list<DynInstPtr> instList[Impl::MaxThreads]; + + /** A list of all instructions that are going to be replayed. */ + std::list<DynInstPtr> instsToReplay; + + /** The memory dependence predictor. It is accessed upon new + * instructions being added to the IQ, and responds by telling + * this unit what instruction the newly added instruction is dependent + * upon. + */ + MemDepPred depPred; + + /** Is there an outstanding load barrier that loads must wait on. */ + bool loadBarrier; + /** The sequence number of the load barrier. */ + InstSeqNum loadBarrierSN; + /** Is there an outstanding store barrier that loads must wait on. */ + bool storeBarrier; + /** The sequence number of the store barrier. */ + InstSeqNum storeBarrierSN; + + /** Pointer to the IQ. */ + InstructionQueue<Impl> *iqPtr; + + /** The thread id of this memory dependence unit. */ + int id; + + /** Stat for number of inserted loads. */ + Stats::Scalar<> insertedLoads; + /** Stat for number of inserted stores. */ + Stats::Scalar<> insertedStores; + /** Stat for number of conflicting loads that had to wait for a store. */ + Stats::Scalar<> conflictingLoads; + /** Stat for number of conflicting stores that had to wait for a store. */ + Stats::Scalar<> conflictingStores; +}; + +#endif // __CPU_O3_MEM_DEP_UNIT_HH__ diff --git a/src/cpu/o3/mem_dep_unit_impl.hh b/src/cpu/o3/mem_dep_unit_impl.hh new file mode 100644 index 000000000..c649ca385 --- /dev/null +++ b/src/cpu/o3/mem_dep_unit_impl.hh @@ -0,0 +1,574 @@ +/* + * Copyright (c) 2004-2006 The Regents of The University of Michigan + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are + * met: redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer; + * redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution; + * neither the name of the copyright holders nor the names of its + * contributors may be used to endorse or promote products derived from + * this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + * Authors: Kevin Lim + */ + +#include <map> + +#include "cpu/o3/inst_queue.hh" +#include "cpu/o3/mem_dep_unit.hh" + +template <class MemDepPred, class Impl> +MemDepUnit<MemDepPred, Impl>::MemDepUnit(Params *params) + : depPred(params->SSITSize, params->LFSTSize), loadBarrier(false), + loadBarrierSN(0), storeBarrier(false), storeBarrierSN(0), iqPtr(NULL) +{ + DPRINTF(MemDepUnit, "Creating MemDepUnit object.\n"); +} + +template <class MemDepPred, class Impl> +MemDepUnit<MemDepPred, Impl>::~MemDepUnit() +{ + for (int tid=0; tid < Impl::MaxThreads; tid++) { + + ListIt inst_list_it = instList[tid].begin(); + + MemDepHashIt hash_it; + + while (!instList[tid].empty()) { + hash_it = memDepHash.find((*inst_list_it)->seqNum); + + assert(hash_it != memDepHash.end()); + + memDepHash.erase(hash_it); + + instList[tid].erase(inst_list_it++); + } + } + +#ifdef DEBUG + assert(MemDepEntry::memdep_count == 0); +#endif +} + +template <class MemDepPred, class Impl> +std::string +MemDepUnit<MemDepPred, Impl>::name() const +{ + return "memdepunit"; +} + +template <class MemDepPred, class Impl> +void +MemDepUnit<MemDepPred, Impl>::init(Params *params, int tid) +{ + DPRINTF(MemDepUnit, "Creating MemDepUnit %i object.\n",tid); + + id = tid; + + depPred.init(params->SSITSize, params->LFSTSize); +} + +template <class MemDepPred, class Impl> +void +MemDepUnit<MemDepPred, Impl>::regStats() +{ + insertedLoads + .name(name() + ".memDep.insertedLoads") + .desc("Number of loads inserted to the mem dependence unit."); + + insertedStores + .name(name() + ".memDep.insertedStores") + .desc("Number of stores inserted to the mem dependence unit."); + + conflictingLoads + .name(name() + ".memDep.conflictingLoads") + .desc("Number of conflicting loads."); + + conflictingStores + .name(name() + ".memDep.conflictingStores") + .desc("Number of conflicting stores."); +} + +template <class MemDepPred, class Impl> +void +MemDepUnit<MemDepPred, Impl>::switchOut() +{ + assert(instList[0].empty()); + assert(instsToReplay.empty()); + assert(memDepHash.empty()); + // Clear any state. + for (int i = 0; i < Impl::MaxThreads; ++i) { + instList[i].clear(); + } + instsToReplay.clear(); + memDepHash.clear(); +} + +template <class MemDepPred, class Impl> +void +MemDepUnit<MemDepPred, Impl>::takeOverFrom() +{ + // Be sure to reset all state. + loadBarrier = storeBarrier = false; + loadBarrierSN = storeBarrierSN = 0; + depPred.clear(); +} + +template <class MemDepPred, class Impl> +void +MemDepUnit<MemDepPred, Impl>::setIQ(InstructionQueue<Impl> *iq_ptr) +{ + iqPtr = iq_ptr; +} + +template <class MemDepPred, class Impl> +void +MemDepUnit<MemDepPred, Impl>::insert(DynInstPtr &inst) +{ + unsigned tid = inst->threadNumber; + + MemDepEntryPtr inst_entry = new MemDepEntry(inst); + + // Add the MemDepEntry to the hash. + memDepHash.insert( + std::pair<InstSeqNum, MemDepEntryPtr>(inst->seqNum, inst_entry)); +#ifdef DEBUG + MemDepEntry::memdep_insert++; +#endif + + instList[tid].push_back(inst); + + inst_entry->listIt = --(instList[tid].end()); + + // Check any barriers and the dependence predictor for any + // producing memrefs/stores. + InstSeqNum producing_store; + if (inst->isLoad() && loadBarrier) { + producing_store = loadBarrierSN; + } else if (inst->isStore() && storeBarrier) { + producing_store = storeBarrierSN; + } else { + producing_store = depPred.checkInst(inst->readPC()); + } + + MemDepEntryPtr store_entry = NULL; + + // If there is a producing store, try to find the entry. + if (producing_store != 0) { + MemDepHashIt hash_it = memDepHash.find(producing_store); + + if (hash_it != memDepHash.end()) { + store_entry = (*hash_it).second; + } + } + + // If no store entry, then instruction can issue as soon as the registers + // are ready. + if (!store_entry) { + DPRINTF(MemDepUnit, "No dependency for inst PC " + "%#x [sn:%lli].\n", inst->readPC(), inst->seqNum); + + inst_entry->memDepReady = true; + + if (inst->readyToIssue()) { + inst_entry->regsReady = true; + + moveToReady(inst_entry); + } + } else { + // Otherwise make the instruction dependent on the store/barrier. + DPRINTF(MemDepUnit, "Adding to dependency list; " + "inst PC %#x is dependent on [sn:%lli].\n", + inst->readPC(), producing_store); + + if (inst->readyToIssue()) { + inst_entry->regsReady = true; + } + + // Add this instruction to the list of dependents. + store_entry->dependInsts.push_back(inst_entry); + + if (inst->isLoad()) { + ++conflictingLoads; + } else { + ++conflictingStores; + } + } + + if (inst->isStore()) { + DPRINTF(MemDepUnit, "Inserting store PC %#x [sn:%lli].\n", + inst->readPC(), inst->seqNum); + + depPred.insertStore(inst->readPC(), inst->seqNum, inst->threadNumber); + + ++insertedStores; + } else if (inst->isLoad()) { + ++insertedLoads; + } else { + panic("Unknown type! (most likely a barrier)."); + } +} + +template <class MemDepPred, class Impl> +void +MemDepUnit<MemDepPred, Impl>::insertNonSpec(DynInstPtr &inst) +{ + unsigned tid = inst->threadNumber; + + MemDepEntryPtr inst_entry = new MemDepEntry(inst); + + // Insert the MemDepEntry into the hash. + memDepHash.insert( + std::pair<InstSeqNum, MemDepEntryPtr>(inst->seqNum, inst_entry)); +#ifdef DEBUG + MemDepEntry::memdep_insert++; +#endif + + // Add the instruction to the list. + instList[tid].push_back(inst); + + inst_entry->listIt = --(instList[tid].end()); + + // Might want to turn this part into an inline function or something. + // It's shared between both insert functions. + if (inst->isStore()) { + DPRINTF(MemDepUnit, "Inserting store PC %#x [sn:%lli].\n", + inst->readPC(), inst->seqNum); + + depPred.insertStore(inst->readPC(), inst->seqNum, inst->threadNumber); + + ++insertedStores; + } else if (inst->isLoad()) { + ++insertedLoads; + } else { + panic("Unknown type! (most likely a barrier)."); + } +} + +template <class MemDepPred, class Impl> +void +MemDepUnit<MemDepPred, Impl>::insertBarrier(DynInstPtr &barr_inst) +{ + InstSeqNum barr_sn = barr_inst->seqNum; + // Memory barriers block loads and stores, write barriers only stores. + if (barr_inst->isMemBarrier()) { + loadBarrier = true; + loadBarrierSN = barr_sn; + storeBarrier = true; + storeBarrierSN = barr_sn; + DPRINTF(MemDepUnit, "Inserted a memory barrier\n"); + } else if (barr_inst->isWriteBarrier()) { + storeBarrier = true; + storeBarrierSN = barr_sn; + DPRINTF(MemDepUnit, "Inserted a write barrier\n"); + } + + unsigned tid = barr_inst->threadNumber; + + MemDepEntryPtr inst_entry = new MemDepEntry(barr_inst); + + // Add the MemDepEntry to the hash. + memDepHash.insert( + std::pair<InstSeqNum, MemDepEntryPtr>(barr_sn, inst_entry)); +#ifdef DEBUG + MemDepEntry::memdep_insert++; +#endif + + // Add the instruction to the instruction list. + instList[tid].push_back(barr_inst); + + inst_entry->listIt = --(instList[tid].end()); +} + +template <class MemDepPred, class Impl> +void +MemDepUnit<MemDepPred, Impl>::regsReady(DynInstPtr &inst) +{ + DPRINTF(MemDepUnit, "Marking registers as ready for " + "instruction PC %#x [sn:%lli].\n", + inst->readPC(), inst->seqNum); + + MemDepEntryPtr inst_entry = findInHash(inst); + + inst_entry->regsReady = true; + + if (inst_entry->memDepReady) { + DPRINTF(MemDepUnit, "Instruction has its memory " + "dependencies resolved, adding it to the ready list.\n"); + + moveToReady(inst_entry); + } else { + DPRINTF(MemDepUnit, "Instruction still waiting on " + "memory dependency.\n"); + } +} + +template <class MemDepPred, class Impl> +void +MemDepUnit<MemDepPred, Impl>::nonSpecInstReady(DynInstPtr &inst) +{ + DPRINTF(MemDepUnit, "Marking non speculative " + "instruction PC %#x as ready [sn:%lli].\n", + inst->readPC(), inst->seqNum); + + MemDepEntryPtr inst_entry = findInHash(inst); + + moveToReady(inst_entry); +} + +template <class MemDepPred, class Impl> +void +MemDepUnit<MemDepPred, Impl>::reschedule(DynInstPtr &inst) +{ + instsToReplay.push_back(inst); +} + +template <class MemDepPred, class Impl> +void +MemDepUnit<MemDepPred, Impl>::replay(DynInstPtr &inst) +{ + DynInstPtr temp_inst; + bool found_inst = false; + + // For now this replay function replays all waiting memory ops. + while (!instsToReplay.empty()) { + temp_inst = instsToReplay.front(); + + MemDepEntryPtr inst_entry = findInHash(temp_inst); + + DPRINTF(MemDepUnit, "Replaying mem instruction PC %#x " + "[sn:%lli].\n", + temp_inst->readPC(), temp_inst->seqNum); + + moveToReady(inst_entry); + + if (temp_inst == inst) { + found_inst = true; + } + + instsToReplay.pop_front(); + } + + assert(found_inst); +} + +template <class MemDepPred, class Impl> +void +MemDepUnit<MemDepPred, Impl>::completed(DynInstPtr &inst) +{ + DPRINTF(MemDepUnit, "Completed mem instruction PC %#x " + "[sn:%lli].\n", + inst->readPC(), inst->seqNum); + + unsigned tid = inst->threadNumber; + + // Remove the instruction from the hash and the list. + MemDepHashIt hash_it = memDepHash.find(inst->seqNum); + + assert(hash_it != memDepHash.end()); + + instList[tid].erase((*hash_it).second->listIt); + + (*hash_it).second = NULL; + + memDepHash.erase(hash_it); +#ifdef DEBUG + MemDepEntry::memdep_erase++; +#endif +} + +template <class MemDepPred, class Impl> +void +MemDepUnit<MemDepPred, Impl>::completeBarrier(DynInstPtr &inst) +{ + wakeDependents(inst); + completed(inst); + + InstSeqNum barr_sn = inst->seqNum; + + if (inst->isMemBarrier()) { + assert(loadBarrier && storeBarrier); + if (loadBarrierSN == barr_sn) + loadBarrier = false; + if (storeBarrierSN == barr_sn) + storeBarrier = false; + } else if (inst->isWriteBarrier()) { + assert(storeBarrier); + if (storeBarrierSN == barr_sn) + storeBarrier = false; + } +} + +template <class MemDepPred, class Impl> +void +MemDepUnit<MemDepPred, Impl>::wakeDependents(DynInstPtr &inst) +{ + // Only stores and barriers have dependents. + if (!inst->isStore() && !inst->isMemBarrier() && !inst->isWriteBarrier()) { + return; + } + + MemDepEntryPtr inst_entry = findInHash(inst); + + for (int i = 0; i < inst_entry->dependInsts.size(); ++i ) { + MemDepEntryPtr woken_inst = inst_entry->dependInsts[i]; + + if (!woken_inst->inst) { + // Potentially removed mem dep entries could be on this list + continue; + } + + DPRINTF(MemDepUnit, "Waking up a dependent inst, " + "[sn:%lli].\n", + woken_inst->inst->seqNum); + + if (woken_inst->regsReady && !woken_inst->squashed) { + moveToReady(woken_inst); + } else { + woken_inst->memDepReady = true; + } + } + + inst_entry->dependInsts.clear(); +} + +template <class MemDepPred, class Impl> +void +MemDepUnit<MemDepPred, Impl>::squash(const InstSeqNum &squashed_num, + unsigned tid) +{ + if (!instsToReplay.empty()) { + ListIt replay_it = instsToReplay.begin(); + while (replay_it != instsToReplay.end()) { + if ((*replay_it)->threadNumber == tid && + (*replay_it)->seqNum > squashed_num) { + instsToReplay.erase(replay_it++); + } else { + ++replay_it; + } + } + } + + ListIt squash_it = instList[tid].end(); + --squash_it; + + MemDepHashIt hash_it; + + while (!instList[tid].empty() && + (*squash_it)->seqNum > squashed_num) { + + DPRINTF(MemDepUnit, "Squashing inst [sn:%lli]\n", + (*squash_it)->seqNum); + + hash_it = memDepHash.find((*squash_it)->seqNum); + + assert(hash_it != memDepHash.end()); + + (*hash_it).second->squashed = true; + + (*hash_it).second = NULL; + + memDepHash.erase(hash_it); +#ifdef DEBUG + MemDepEntry::memdep_erase++; +#endif + + instList[tid].erase(squash_it--); + } + + // Tell the dependency predictor to squash as well. + depPred.squash(squashed_num, tid); +} + +template <class MemDepPred, class Impl> +void +MemDepUnit<MemDepPred, Impl>::violation(DynInstPtr &store_inst, + DynInstPtr &violating_load) +{ + DPRINTF(MemDepUnit, "Passing violating PCs to store sets," + " load: %#x, store: %#x\n", violating_load->readPC(), + store_inst->readPC()); + // Tell the memory dependence unit of the violation. + depPred.violation(violating_load->readPC(), store_inst->readPC()); +} + +template <class MemDepPred, class Impl> +void +MemDepUnit<MemDepPred, Impl>::issue(DynInstPtr &inst) +{ + DPRINTF(MemDepUnit, "Issuing instruction PC %#x [sn:%lli].\n", + inst->readPC(), inst->seqNum); + + depPred.issued(inst->readPC(), inst->seqNum, inst->isStore()); +} + +template <class MemDepPred, class Impl> +inline typename MemDepUnit<MemDepPred,Impl>::MemDepEntryPtr & +MemDepUnit<MemDepPred, Impl>::findInHash(const DynInstPtr &inst) +{ + MemDepHashIt hash_it = memDepHash.find(inst->seqNum); + + assert(hash_it != memDepHash.end()); + + return (*hash_it).second; +} + +template <class MemDepPred, class Impl> +inline void +MemDepUnit<MemDepPred, Impl>::moveToReady(MemDepEntryPtr &woken_inst_entry) +{ + DPRINTF(MemDepUnit, "Adding instruction [sn:%lli] " + "to the ready list.\n", woken_inst_entry->inst->seqNum); + + assert(!woken_inst_entry->squashed); + + iqPtr->addReadyMemInst(woken_inst_entry->inst); +} + + +template <class MemDepPred, class Impl> +void +MemDepUnit<MemDepPred, Impl>::dumpLists() +{ + for (unsigned tid=0; tid < Impl::MaxThreads; tid++) { + cprintf("Instruction list %i size: %i\n", + tid, instList[tid].size()); + + ListIt inst_list_it = instList[tid].begin(); + int num = 0; + + while (inst_list_it != instList[tid].end()) { + cprintf("Instruction:%i\nPC:%#x\n[sn:%i]\n[tid:%i]\nIssued:%i\n" + "Squashed:%i\n\n", + num, (*inst_list_it)->readPC(), + (*inst_list_it)->seqNum, + (*inst_list_it)->threadNumber, + (*inst_list_it)->isIssued(), + (*inst_list_it)->isSquashed()); + inst_list_it++; + ++num; + } + } + + cprintf("Memory dependence hash size: %i\n", memDepHash.size()); + +#ifdef DEBUG + cprintf("Memory dependence entries: %i\n", MemDepEntry::memdep_count); +#endif +} diff --git a/src/cpu/o3/mips/cpu.cc b/src/cpu/o3/mips/cpu.cc new file mode 100755 index 000000000..420f460b2 --- /dev/null +++ b/src/cpu/o3/mips/cpu.cc @@ -0,0 +1,39 @@ +/* + * Copyright (c) 2006 The Regents of The University of Michigan + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are + * met: redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer; + * redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution; + * neither the name of the copyright holders nor the names of its + * contributors may be used to endorse or promote products derived from + * this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + * Authors: Kevin Lim + * Korey Sewell + */ + +#include "cpu/o3/mips/impl.hh" +#include "cpu/o3/mips/cpu_impl.hh" +#include "cpu/o3/mips/dyn_inst.hh" + +// Force instantiation of MipsO3CPU for all the implemntations that are +// needed. Consider merging this and mips_dyn_inst.cc, and maybe all +// classes that depend on a certain impl, into one file (mips_impl.cc?). +template class MipsO3CPU<MipsSimpleImpl>; diff --git a/src/cpu/o3/mips/cpu.hh b/src/cpu/o3/mips/cpu.hh new file mode 100755 index 000000000..bf04b9f69 --- /dev/null +++ b/src/cpu/o3/mips/cpu.hh @@ -0,0 +1,149 @@ +/* + * Copyright (c) 2006 The Regents of The University of Michigan + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are + * met: redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer; + * redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution; + * neither the name of the copyright holders nor the names of its + * contributors may be used to endorse or promote products derived from + * this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + * Authors: Kevin Lim + * Korey Sewell + */ + +#ifndef __CPU_O3_MIPS_CPU_HH__ +#define __CPU_O3_MIPS_CPU_HH__ + +#include "arch/mips/regfile.hh" +#include "arch/mips/syscallreturn.hh" +#include "cpu/thread_context.hh" +#include "cpu/o3/cpu.hh" +#include "sim/byteswap.hh" +#include "sim/faults.hh" + +class EndQuiesceEvent; +namespace Kernel { + class Statistics; +}; + +class TranslatingPort; + +/** + * MipsO3CPU class. Derives from the FullO3CPU class, and + * implements all ISA and implementation specific functions of the + * CPU. This is the CPU class that is used for the SimObjects, and is + * what is given to the DynInsts. Most of its state exists in the + * FullO3CPU; the state is has is mainly for ISA specific + * functionality. + */ +template <class Impl> +class MipsO3CPU : public FullO3CPU<Impl> +{ + public: + typedef O3ThreadState<Impl> ImplState; + typedef O3ThreadState<Impl> Thread; + typedef typename Impl::Params Params; + + /** Constructs an MipsO3CPU with the given parameters. */ + MipsO3CPU(Params *params); + + /** Registers statistics. */ + void regStats(); + + /** Translates instruction requestion in syscall emulation mode. */ + Fault translateInstReq(RequestPtr &req, Thread *thread) + { + return thread->getProcessPtr()->pTable->translate(req); + } + + /** Translates data read request in syscall emulation mode. */ + Fault translateDataReadReq(RequestPtr &req, Thread *thread) + { + return thread->getProcessPtr()->pTable->translate(req); + } + + /** Translates data write request in syscall emulation mode. */ + Fault translateDataWriteReq(RequestPtr &req, Thread *thread) + { + return thread->getProcessPtr()->pTable->translate(req); + } + + /** Reads a miscellaneous register. */ + TheISA::MiscReg readMiscReg(int misc_reg, unsigned tid); + + /** Reads a misc. register, including any side effects the read + * might have as defined by the architecture. + */ + TheISA::MiscReg readMiscRegWithEffect(int misc_reg, + Fault &fault, unsigned tid); + + /** Sets a miscellaneous register. */ + Fault setMiscReg(int misc_reg, const TheISA::MiscReg &val, unsigned tid); + + /** Sets a misc. register, including any side effects the write + * might have as defined by the architecture. + */ + Fault setMiscRegWithEffect(int misc_reg, + const TheISA::MiscReg &val, unsigned tid); + + /** Initiates a squash of all in-flight instructions for a given + * thread. The source of the squash is an external update of + * state through the TC. + */ + void squashFromTC(unsigned tid); + + /** Traps to handle given fault. */ + void trap(Fault fault, unsigned tid); + + /** Executes a syscall. + * @todo: Determine if this needs to be virtual. + */ + void syscall(int64_t callnum, int tid); + /** Gets a syscall argument. */ + TheISA::IntReg getSyscallArg(int i, int tid); + + /** Used to shift args for indirect syscall. */ + void setSyscallArg(int i, TheISA::IntReg val, int tid); + + /** Sets the return value of a syscall. */ + void setSyscallReturn(SyscallReturn return_value, int tid); + + /** CPU read function, forwards read to LSQ. */ + template <class T> + Fault read(RequestPtr &req, T &data, int load_idx) + { + return this->iew.ldstQueue.read(req, data, load_idx); + } + + /** CPU write function, forwards write to LSQ. */ + template <class T> + Fault write(RequestPtr &req, T &data, int store_idx) + { + return this->iew.ldstQueue.write(req, data, store_idx); + } + + Addr lockAddr; + + /** Temporary fix for the lock flag, works in the UP case. */ + bool lockFlag; +}; + +#endif // __CPU_O3_MIPS_CPU_HH__ diff --git a/src/cpu/o3/mips/cpu_builder.cc b/src/cpu/o3/mips/cpu_builder.cc new file mode 100644 index 000000000..f1c3b33a5 --- /dev/null +++ b/src/cpu/o3/mips/cpu_builder.cc @@ -0,0 +1,394 @@ +/* + * Copyright (c) 2006 The Regents of The University of Michigan + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are + * met: redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer; + * redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution; + * neither the name of the copyright holders nor the names of its + * contributors may be used to endorse or promote products derived from + * this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + * Authors: Kevin Lim + * Korey Sewell + */ + +#include <string> + +#include "cpu/base.hh" +#include "cpu/o3/mips/cpu.hh" +#include "cpu/o3/mips/impl.hh" +#include "cpu/o3/mips/params.hh" +#include "cpu/o3/fu_pool.hh" +#include "sim/builder.hh" + +class DerivO3CPU : public MipsO3CPU<MipsSimpleImpl> +{ + public: + DerivO3CPU(MipsSimpleParams *p) + : MipsO3CPU<MipsSimpleImpl>(p) + { } +}; + +BEGIN_DECLARE_SIM_OBJECT_PARAMS(DerivO3CPU) + +Param<int> clock; +Param<int> numThreads; +Param<int> activity; + +SimObjectVectorParam<Process *> workload; + +SimObjectParam<MemObject *> mem; + +SimObjectParam<BaseCPU *> checker; + +Param<Counter> max_insts_any_thread; +Param<Counter> max_insts_all_threads; +Param<Counter> max_loads_any_thread; +Param<Counter> max_loads_all_threads; + +Param<unsigned> cachePorts; + +Param<unsigned> decodeToFetchDelay; +Param<unsigned> renameToFetchDelay; +Param<unsigned> iewToFetchDelay; +Param<unsigned> commitToFetchDelay; +Param<unsigned> fetchWidth; + +Param<unsigned> renameToDecodeDelay; +Param<unsigned> iewToDecodeDelay; +Param<unsigned> commitToDecodeDelay; +Param<unsigned> fetchToDecodeDelay; +Param<unsigned> decodeWidth; + +Param<unsigned> iewToRenameDelay; +Param<unsigned> commitToRenameDelay; +Param<unsigned> decodeToRenameDelay; +Param<unsigned> renameWidth; + +Param<unsigned> commitToIEWDelay; +Param<unsigned> renameToIEWDelay; +Param<unsigned> issueToExecuteDelay; +Param<unsigned> dispatchWidth; +Param<unsigned> issueWidth; +Param<unsigned> wbWidth; +Param<unsigned> wbDepth; +SimObjectParam<FUPool *> fuPool; + +Param<unsigned> iewToCommitDelay; +Param<unsigned> renameToROBDelay; +Param<unsigned> commitWidth; +Param<unsigned> squashWidth; +Param<Tick> trapLatency; + +Param<unsigned> backComSize; +Param<unsigned> forwardComSize; + +Param<std::string> predType; +Param<unsigned> localPredictorSize; +Param<unsigned> localCtrBits; +Param<unsigned> localHistoryTableSize; +Param<unsigned> localHistoryBits; +Param<unsigned> globalPredictorSize; +Param<unsigned> globalCtrBits; +Param<unsigned> globalHistoryBits; +Param<unsigned> choicePredictorSize; +Param<unsigned> choiceCtrBits; + +Param<unsigned> BTBEntries; +Param<unsigned> BTBTagSize; + +Param<unsigned> RASSize; + +Param<unsigned> LQEntries; +Param<unsigned> SQEntries; +Param<unsigned> LFSTSize; +Param<unsigned> SSITSize; + +Param<unsigned> numPhysIntRegs; +Param<unsigned> numPhysFloatRegs; +Param<unsigned> numIQEntries; +Param<unsigned> numROBEntries; + +Param<unsigned> smtNumFetchingThreads; +Param<std::string> smtFetchPolicy; +Param<std::string> smtLSQPolicy; +Param<unsigned> smtLSQThreshold; +Param<std::string> smtIQPolicy; +Param<unsigned> smtIQThreshold; +Param<std::string> smtROBPolicy; +Param<unsigned> smtROBThreshold; +Param<std::string> smtCommitPolicy; + +Param<unsigned> instShiftAmt; + +Param<bool> defer_registration; + +Param<bool> function_trace; +Param<Tick> function_trace_start; + +END_DECLARE_SIM_OBJECT_PARAMS(DerivO3CPU) + +BEGIN_INIT_SIM_OBJECT_PARAMS(DerivO3CPU) + + INIT_PARAM(clock, "clock speed"), + INIT_PARAM(numThreads, "number of HW thread contexts"), + INIT_PARAM_DFLT(activity, "Initial activity count", 0), + + INIT_PARAM(workload, "Processes to run"), + + INIT_PARAM(mem, "Memory"), + + INIT_PARAM_DFLT(checker, "Checker CPU", NULL), + + INIT_PARAM_DFLT(max_insts_any_thread, + "Terminate when any thread reaches this inst count", + 0), + INIT_PARAM_DFLT(max_insts_all_threads, + "Terminate when all threads have reached" + "this inst count", + 0), + INIT_PARAM_DFLT(max_loads_any_thread, + "Terminate when any thread reaches this load count", + 0), + INIT_PARAM_DFLT(max_loads_all_threads, + "Terminate when all threads have reached this load" + "count", + 0), + + INIT_PARAM_DFLT(cachePorts, "Cache Ports", 200), + + INIT_PARAM(decodeToFetchDelay, "Decode to fetch delay"), + INIT_PARAM(renameToFetchDelay, "Rename to fetch delay"), + INIT_PARAM(iewToFetchDelay, "Issue/Execute/Writeback to fetch" + "delay"), + INIT_PARAM(commitToFetchDelay, "Commit to fetch delay"), + INIT_PARAM(fetchWidth, "Fetch width"), + INIT_PARAM(renameToDecodeDelay, "Rename to decode delay"), + INIT_PARAM(iewToDecodeDelay, "Issue/Execute/Writeback to decode" + "delay"), + INIT_PARAM(commitToDecodeDelay, "Commit to decode delay"), + INIT_PARAM(fetchToDecodeDelay, "Fetch to decode delay"), + INIT_PARAM(decodeWidth, "Decode width"), + + INIT_PARAM(iewToRenameDelay, "Issue/Execute/Writeback to rename" + "delay"), + INIT_PARAM(commitToRenameDelay, "Commit to rename delay"), + INIT_PARAM(decodeToRenameDelay, "Decode to rename delay"), + INIT_PARAM(renameWidth, "Rename width"), + + INIT_PARAM(commitToIEWDelay, "Commit to " + "Issue/Execute/Writeback delay"), + INIT_PARAM(renameToIEWDelay, "Rename to " + "Issue/Execute/Writeback delay"), + INIT_PARAM(issueToExecuteDelay, "Issue to execute delay (internal" + "to the IEW stage)"), + INIT_PARAM(dispatchWidth, "Dispatch width"), + INIT_PARAM(issueWidth, "Issue width"), + INIT_PARAM(wbWidth, "Writeback width"), + INIT_PARAM(wbDepth, "Writeback depth (number of cycles it can buffer)"), + INIT_PARAM_DFLT(fuPool, "Functional unit pool", NULL), + + INIT_PARAM(iewToCommitDelay, "Issue/Execute/Writeback to commit " + "delay"), + INIT_PARAM(renameToROBDelay, "Rename to reorder buffer delay"), + INIT_PARAM(commitWidth, "Commit width"), + INIT_PARAM(squashWidth, "Squash width"), + INIT_PARAM_DFLT(trapLatency, "Number of cycles before the trap is handled", 6), + + INIT_PARAM(backComSize, "Time buffer size for backwards communication"), + INIT_PARAM(forwardComSize, "Time buffer size for forward communication"), + + INIT_PARAM(predType, "Type of branch predictor ('local', 'tournament')"), + INIT_PARAM(localPredictorSize, "Size of local predictor"), + INIT_PARAM(localCtrBits, "Bits per counter"), + INIT_PARAM(localHistoryTableSize, "Size of local history table"), + INIT_PARAM(localHistoryBits, "Bits for the local history"), + INIT_PARAM(globalPredictorSize, "Size of global predictor"), + INIT_PARAM(globalCtrBits, "Bits per counter"), + INIT_PARAM(globalHistoryBits, "Bits of history"), + INIT_PARAM(choicePredictorSize, "Size of choice predictor"), + INIT_PARAM(choiceCtrBits, "Bits of choice counters"), + + INIT_PARAM(BTBEntries, "Number of BTB entries"), + INIT_PARAM(BTBTagSize, "Size of the BTB tags, in bits"), + + INIT_PARAM(RASSize, "RAS size"), + + INIT_PARAM(LQEntries, "Number of load queue entries"), + INIT_PARAM(SQEntries, "Number of store queue entries"), + INIT_PARAM(LFSTSize, "Last fetched store table size"), + INIT_PARAM(SSITSize, "Store set ID table size"), + + INIT_PARAM(numPhysIntRegs, "Number of physical integer registers"), + INIT_PARAM(numPhysFloatRegs, "Number of physical floating point " + "registers"), + INIT_PARAM(numIQEntries, "Number of instruction queue entries"), + INIT_PARAM(numROBEntries, "Number of reorder buffer entries"), + + INIT_PARAM_DFLT(smtNumFetchingThreads, "SMT Number of Fetching Threads", 1), + INIT_PARAM_DFLT(smtFetchPolicy, "SMT Fetch Policy", "SingleThread"), + INIT_PARAM_DFLT(smtLSQPolicy, "SMT LSQ Sharing Policy", "Partitioned"), + INIT_PARAM_DFLT(smtLSQThreshold,"SMT LSQ Threshold", 100), + INIT_PARAM_DFLT(smtIQPolicy, "SMT IQ Policy", "Partitioned"), + INIT_PARAM_DFLT(smtIQThreshold, "SMT IQ Threshold", 100), + INIT_PARAM_DFLT(smtROBPolicy, "SMT ROB Sharing Policy", "Partitioned"), + INIT_PARAM_DFLT(smtROBThreshold,"SMT ROB Threshold", 100), + INIT_PARAM_DFLT(smtCommitPolicy,"SMT Commit Fetch Policy", "RoundRobin"), + + INIT_PARAM(instShiftAmt, "Number of bits to shift instructions by"), + INIT_PARAM(defer_registration, "defer system registration (for sampling)"), + + INIT_PARAM(function_trace, "Enable function trace"), + INIT_PARAM(function_trace_start, "Cycle to start function trace") + +END_INIT_SIM_OBJECT_PARAMS(DerivO3CPU) + +CREATE_SIM_OBJECT(DerivO3CPU) +{ + DerivO3CPU *cpu; + + // In non-full-system mode, we infer the number of threads from + // the workload if it's not explicitly specified. + int actual_num_threads = + (numThreads.isValid() && numThreads >= workload.size()) ? + numThreads : workload.size(); + + if (workload.size() == 0) { + fatal("Must specify at least one workload!"); + } + + MipsSimpleParams *params = new MipsSimpleParams; + + params->clock = clock; + + params->name = getInstanceName(); + params->numberOfThreads = actual_num_threads; + params->activity = activity; + + params->workload = workload; + + params->mem = mem; + + params->checker = checker; + + params->max_insts_any_thread = max_insts_any_thread; + params->max_insts_all_threads = max_insts_all_threads; + params->max_loads_any_thread = max_loads_any_thread; + params->max_loads_all_threads = max_loads_all_threads; + + // + // Caches + // + params->cachePorts = cachePorts; + + params->decodeToFetchDelay = decodeToFetchDelay; + params->renameToFetchDelay = renameToFetchDelay; + params->iewToFetchDelay = iewToFetchDelay; + params->commitToFetchDelay = commitToFetchDelay; + params->fetchWidth = fetchWidth; + + params->renameToDecodeDelay = renameToDecodeDelay; + params->iewToDecodeDelay = iewToDecodeDelay; + params->commitToDecodeDelay = commitToDecodeDelay; + params->fetchToDecodeDelay = fetchToDecodeDelay; + params->decodeWidth = decodeWidth; + + params->iewToRenameDelay = iewToRenameDelay; + params->commitToRenameDelay = commitToRenameDelay; + params->decodeToRenameDelay = decodeToRenameDelay; + params->renameWidth = renameWidth; + + params->commitToIEWDelay = commitToIEWDelay; + params->renameToIEWDelay = renameToIEWDelay; + params->issueToExecuteDelay = issueToExecuteDelay; + params->dispatchWidth = dispatchWidth; + params->issueWidth = issueWidth; + params->wbWidth = wbWidth; + params->wbDepth = wbDepth; + params->fuPool = fuPool; + + params->iewToCommitDelay = iewToCommitDelay; + params->renameToROBDelay = renameToROBDelay; + params->commitWidth = commitWidth; + params->squashWidth = squashWidth; + params->trapLatency = trapLatency; + + params->backComSize = backComSize; + params->forwardComSize = forwardComSize; + + params->predType = predType; + params->localPredictorSize = localPredictorSize; + params->localCtrBits = localCtrBits; + params->localHistoryTableSize = localHistoryTableSize; + params->localHistoryBits = localHistoryBits; + params->globalPredictorSize = globalPredictorSize; + params->globalCtrBits = globalCtrBits; + params->globalHistoryBits = globalHistoryBits; + params->choicePredictorSize = choicePredictorSize; + params->choiceCtrBits = choiceCtrBits; + + params->BTBEntries = BTBEntries; + params->BTBTagSize = BTBTagSize; + + params->RASSize = RASSize; + + params->LQEntries = LQEntries; + params->SQEntries = SQEntries; + + params->SSITSize = SSITSize; + params->LFSTSize = LFSTSize; + + params->numPhysIntRegs = numPhysIntRegs; + params->numPhysFloatRegs = numPhysFloatRegs; + params->numIQEntries = numIQEntries; + params->numROBEntries = numROBEntries; + + params->smtNumFetchingThreads = smtNumFetchingThreads; + + // Default smtFetchPolicy to "RoundRobin", if necessary. + std::string round_robin_policy = "RoundRobin"; + std::string single_thread = "SingleThread"; + + if (actual_num_threads > 1 && single_thread.compare(smtFetchPolicy) == 0) + params->smtFetchPolicy = round_robin_policy; + else + params->smtFetchPolicy = smtFetchPolicy; + + params->smtIQPolicy = smtIQPolicy; + params->smtLSQPolicy = smtLSQPolicy; + params->smtLSQThreshold = smtLSQThreshold; + params->smtROBPolicy = smtROBPolicy; + params->smtROBThreshold = smtROBThreshold; + params->smtCommitPolicy = smtCommitPolicy; + + params->instShiftAmt = 2; + + params->deferRegistration = defer_registration; + + params->functionTrace = function_trace; + params->functionTraceStart = function_trace_start; + + cpu = new DerivO3CPU(params); + + return cpu; +} + +REGISTER_SIM_OBJECT("DerivO3CPU", DerivO3CPU) + diff --git a/src/cpu/o3/mips/cpu_impl.hh b/src/cpu/o3/mips/cpu_impl.hh new file mode 100644 index 000000000..e08741626 --- /dev/null +++ b/src/cpu/o3/mips/cpu_impl.hh @@ -0,0 +1,250 @@ +/* + * Copyright (c) 2006 The Regents of The University of Michigan + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are + * met: redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer; + * redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution; + * neither the name of the copyright holders nor the names of its + * contributors may be used to endorse or promote products derived from + * this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + * Authors: Kevin Lim + * Korey Sewell + */ + +#include "config/use_checker.hh" + +#include "arch/mips/faults.hh" +#include "base/cprintf.hh" +#include "base/statistics.hh" +#include "base/timebuf.hh" +#include "cpu/checker/thread_context.hh" +#include "sim/sim_events.hh" +#include "sim/stats.hh" + +#include "cpu/o3/mips/cpu.hh" +#include "cpu/o3/mips/params.hh" +#include "cpu/o3/mips/thread_context.hh" +#include "cpu/o3/comm.hh" +#include "cpu/o3/thread_state.hh" + +template <class Impl> +MipsO3CPU<Impl>::MipsO3CPU(Params *params) + : FullO3CPU<Impl>(params) +{ + DPRINTF(O3CPU, "Creating MipsO3CPU object.\n"); + + // Setup any thread state. + this->thread.resize(this->numThreads); + + for (int i = 0; i < this->numThreads; ++i) { + if (i < params->workload.size()) { + DPRINTF(O3CPU, "Workload[%i] process is %#x", + i, this->thread[i]); + this->thread[i] = new Thread(this, i, params->workload[i], + i, params->mem); + + this->thread[i]->setStatus(ThreadContext::Suspended); + + + /* Use this port to for syscall emulation writes to memory. */ + Port *mem_port; + TranslatingPort *trans_port; + trans_port = new TranslatingPort(csprintf("%s-%d-funcport", + name(), i), + params->workload[i]->pTable, + false); + mem_port = params->mem->getPort("functional"); + mem_port->setPeer(trans_port); + trans_port->setPeer(mem_port); + this->thread[i]->setMemPort(trans_port); + + //usedTids[i] = true; + //threadMap[i] = i; + } else { + //Allocate Empty thread so M5 can use later + //when scheduling threads to CPU + Process* dummy_proc = NULL; + + this->thread[i] = new Thread(this, i, dummy_proc, i, params->mem); + //usedTids[i] = false; + } + + ThreadContext *tc; + + // Setup the TC that will serve as the interface to the threads/CPU. + MipsTC<Impl> *mips_tc = + new MipsTC<Impl>; + + tc = mips_tc; + + // If we're using a checker, then the TC should be the + // CheckerThreadContext. +#if USE_CHECKER + if (params->checker) { + tc = new CheckerThreadContext<MipsTC<Impl> >( + mips_tc, this->checker); + } +#endif + + mips_tc->cpu = this; + mips_tc->thread = this->thread[i]; + + // Give the thread the TC. + this->thread[i]->tc = tc; + + // Add the TC to the CPU's list of TC's. + this->threadContexts.push_back(tc); + } + + for (int i=0; i < this->numThreads; i++) { + this->thread[i]->setFuncExeInst(0); + } + + // Sets CPU pointers. These must be set at this level because the CPU + // pointers are defined to be the highest level of CPU class. + this->fetch.setCPU(this); + this->decode.setCPU(this); + this->rename.setCPU(this); + this->iew.setCPU(this); + this->commit.setCPU(this); + + this->rob.setCPU(this); + this->regFile.setCPU(this); + + lockAddr = 0; + lockFlag = false; +} + +template <class Impl> +void +MipsO3CPU<Impl>::regStats() +{ + // Register stats for everything that has stats. + this->fullCPURegStats(); + this->fetch.regStats(); + this->decode.regStats(); + this->rename.regStats(); + this->iew.regStats(); + this->commit.regStats(); +} + + +template <class Impl> +MiscReg +MipsO3CPU<Impl>::readMiscReg(int misc_reg, unsigned tid) +{ + return this->regFile.readMiscReg(misc_reg, tid); +} + +template <class Impl> +MiscReg +MipsO3CPU<Impl>::readMiscRegWithEffect(int misc_reg, Fault &fault, + unsigned tid) +{ + return this->regFile.readMiscRegWithEffect(misc_reg, fault, tid); +} + +template <class Impl> +Fault +MipsO3CPU<Impl>::setMiscReg(int misc_reg, const MiscReg &val, unsigned tid) +{ + return this->regFile.setMiscReg(misc_reg, val, tid); +} + +template <class Impl> +Fault +MipsO3CPU<Impl>::setMiscRegWithEffect(int misc_reg, const MiscReg &val, + unsigned tid) +{ + return this->regFile.setMiscRegWithEffect(misc_reg, val, tid); +} + +template <class Impl> +void +MipsO3CPU<Impl>::squashFromTC(unsigned tid) +{ + this->thread[tid]->inSyscall = true; + this->commit.generateTCEvent(tid); +} + +template <class Impl> +void +MipsO3CPU<Impl>::trap(Fault fault, unsigned tid) +{ + // Pass the thread's TC into the invoke method. + fault->invoke(this->threadContexts[tid]); +} + +#if !FULL_SYSTEM + +template <class Impl> +void +MipsO3CPU<Impl>::syscall(int64_t callnum, int tid) +{ + DPRINTF(O3CPU, "[tid:%i] Executing syscall().\n\n", tid); + + DPRINTF(Activity,"Activity: syscall() called.\n"); + + // Temporarily increase this by one to account for the syscall + // instruction. + ++(this->thread[tid]->funcExeInst); + + // Execute the actual syscall. + this->thread[tid]->syscall(callnum); + + // Decrease funcExeInst by one as the normal commit will handle + // incrementing it. + --(this->thread[tid]->funcExeInst); + + DPRINTF(O3CPU, "[tid:%i] Register 2 is %i ", tid, this->readIntReg(2)); +} + +template <class Impl> +TheISA::IntReg +MipsO3CPU<Impl>::getSyscallArg(int i, int tid) +{ + return this->readArchIntReg(MipsISA::ArgumentReg0 + i, tid); +} + +template <class Impl> +void +MipsO3CPU<Impl>::setSyscallArg(int i, IntReg val, int tid) +{ + this->setArchIntReg(MipsISA::ArgumentReg0 + i, val, tid); +} + +template <class Impl> +void +MipsO3CPU<Impl>::setSyscallReturn(SyscallReturn return_value, int tid) +{ + // check for error condition. + if (return_value.successful()) { + // no error + this->setArchIntReg(TheISA::SyscallSuccessReg, 0, tid); + this->setArchIntReg(TheISA::ReturnValueReg, return_value.value(), tid); + } else { + // got an error, return details + this->setArchIntReg(TheISA::SyscallSuccessReg, + (TheISA::IntReg) -1, tid); + this->setArchIntReg(TheISA::ReturnValueReg, -return_value.value(), tid); + } +} +#endif diff --git a/src/cpu/o3/mips/dyn_inst.cc b/src/cpu/o3/mips/dyn_inst.cc new file mode 100755 index 000000000..216aa7d2c --- /dev/null +++ b/src/cpu/o3/mips/dyn_inst.cc @@ -0,0 +1,37 @@ +/* + * Copyright (c) 2006 The Regents of The University of Michigan + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are + * met: redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer; + * redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution; + * neither the name of the copyright holders nor the names of its + * contributors may be used to endorse or promote products derived from + * this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + * Authors: Kevin Lim + * Korey Sewell + */ + +#include "cpu/o3/mips/dyn_inst_impl.hh" +#include "cpu/o3/mips/impl.hh" + +// Force instantiation of MipsDynInst for all the implementations that +// are needed. +template class MipsDynInst<MipsSimpleImpl>; diff --git a/src/cpu/o3/mips/dyn_inst.hh b/src/cpu/o3/mips/dyn_inst.hh new file mode 100755 index 000000000..06bdfcec4 --- /dev/null +++ b/src/cpu/o3/mips/dyn_inst.hh @@ -0,0 +1,282 @@ +/* + * Copyright (c) 2006 The Regents of The University of Michigan + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are + * met: redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer; + * redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution; + * neither the name of the copyright holders nor the names of its + * contributors may be used to endorse or promote products derived from + * this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + * Authors: Kevin Lim + * Korey Sewell + */ + +#ifndef __CPU_O3_MIPS_DYN_INST_HH__ +#define __CPU_O3_MIPS_DYN_INST_HH__ + +#include "arch/isa_traits.hh" +#include "cpu/base_dyn_inst.hh" +#include "cpu/inst_seq.hh" +#include "cpu/o3/mips/cpu.hh" +#include "cpu/o3/mips/impl.hh" + +class Packet; + +/** + * Mostly implementation & ISA specific MipsDynInst. As with most + * other classes in the new CPU model, it is templated on the Impl to + * allow for passing in of all types, such as the CPU type and the ISA + * type. The MipsDynInst serves as the primary interface to the CPU + * for instructions that are executing. + */ +template <class Impl> +class MipsDynInst : public BaseDynInst<Impl> +{ + public: + /** Typedef for the CPU. */ + typedef typename Impl::O3CPU O3CPU; + + /** Binary machine instruction type. */ + typedef TheISA::MachInst MachInst; + /** Extended machine instruction type. */ + typedef TheISA::ExtMachInst ExtMachInst; + /** Logical register index type. */ + typedef TheISA::RegIndex RegIndex; + /** Integer register index type. */ + typedef TheISA::IntReg IntReg; + typedef TheISA::FloatReg FloatReg; + typedef TheISA::FloatRegBits FloatRegBits; + /** Misc register index type. */ + typedef TheISA::MiscReg MiscReg; + + enum { + MaxInstSrcRegs = TheISA::MaxInstSrcRegs, //< Max source regs + MaxInstDestRegs = TheISA::MaxInstDestRegs, //< Max dest regs + }; + + public: + /** BaseDynInst constructor given a binary instruction. */ + MipsDynInst(ExtMachInst inst, Addr PC, Addr Pred_PC, InstSeqNum seq_num, + O3CPU *cpu); + + /** BaseDynInst constructor given a static inst pointer. */ + MipsDynInst(StaticInstPtr &_staticInst); + + /** Executes the instruction.*/ + Fault execute(); + + /** Initiates the access. Only valid for memory operations. */ + Fault initiateAcc(); + + /** Completes the access. Only valid for memory operations. */ + Fault completeAcc(Packet *pkt); + + private: + /** Initializes variables. */ + void initVars(); + + public: + /** Reads a miscellaneous register. */ + MiscReg readMiscReg(int misc_reg) + { + return this->cpu->readMiscReg(misc_reg, this->threadNumber); + } + + /** Reads a misc. register, including any side-effects the read + * might have as defined by the architecture. + */ + MiscReg readMiscRegWithEffect(int misc_reg, Fault &fault) + { + return this->cpu->readMiscRegWithEffect(misc_reg, fault, + this->threadNumber); + } + + /** Sets a misc. register. */ + Fault setMiscReg(int misc_reg, const MiscReg &val) + { + this->instResult.integer = val; + return this->cpu->setMiscReg(misc_reg, val, this->threadNumber); + } + + /** Sets a misc. register, including any side-effects the write + * might have as defined by the architecture. + */ + Fault setMiscRegWithEffect(int misc_reg, const MiscReg &val) + { + return this->cpu->setMiscRegWithEffect(misc_reg, val, + this->threadNumber); + } + + /** Calls a syscall. */ + void syscall(int64_t callnum); + + private: + /** Physical register index of the destination registers of this + * instruction. + */ + PhysRegIndex _destRegIdx[MaxInstDestRegs]; + + /** Physical register index of the source registers of this + * instruction. + */ + PhysRegIndex _srcRegIdx[MaxInstSrcRegs]; + + /** Physical register index of the previous producers of the + * architected destinations. + */ + PhysRegIndex _prevDestRegIdx[MaxInstDestRegs]; + + public: + + // The register accessor methods provide the index of the + // instruction's operand (e.g., 0 or 1), not the architectural + // register index, to simplify the implementation of register + // renaming. We find the architectural register index by indexing + // into the instruction's own operand index table. Note that a + // raw pointer to the StaticInst is provided instead of a + // ref-counted StaticInstPtr to redice overhead. This is fine as + // long as these methods don't copy the pointer into any long-term + // storage (which is pretty hard to imagine they would have reason + // to do). + + uint64_t readIntReg(const StaticInst *si, int idx) + { + return this->cpu->readIntReg(_srcRegIdx[idx]); + } + + FloatReg readFloatReg(const StaticInst *si, int idx, int width) + { + return this->cpu->readFloatReg(_srcRegIdx[idx], width); + } + + FloatReg readFloatReg(const StaticInst *si, int idx) + { + return this->cpu->readFloatReg(_srcRegIdx[idx]); + } + + FloatRegBits readFloatRegBits(const StaticInst *si, int idx, int width) + { + return this->cpu->readFloatRegBits(_srcRegIdx[idx], width); + } + + FloatRegBits readFloatRegBits(const StaticInst *si, int idx) + { + return this->cpu->readFloatRegBits(_srcRegIdx[idx]); + } + + /** @todo: Make results into arrays so they can handle multiple dest + * registers. + */ + void setIntReg(const StaticInst *si, int idx, uint64_t val) + { + this->cpu->setIntReg(_destRegIdx[idx], val); + BaseDynInst<Impl>::setIntReg(si, idx, val); + } + + void setFloatReg(const StaticInst *si, int idx, FloatReg val, int width) + { + this->cpu->setFloatReg(_destRegIdx[idx], val, width); + BaseDynInst<Impl>::setFloatReg(si, idx, val, width); + } + + void setFloatReg(const StaticInst *si, int idx, FloatReg val) + { + this->cpu->setFloatReg(_destRegIdx[idx], val); + BaseDynInst<Impl>::setFloatReg(si, idx, val); + } + + void setFloatRegBits(const StaticInst *si, int idx, + FloatRegBits val, int width) + { + this->cpu->setFloatRegBits(_destRegIdx[idx], val, width); + BaseDynInst<Impl>::setFloatRegBits(si, idx, val); + } + + void setFloatRegBits(const StaticInst *si, int idx, FloatRegBits val) + { + this->cpu->setFloatRegBits(_destRegIdx[idx], val); + BaseDynInst<Impl>::setFloatRegBits(si, idx, val); + } + + /** Returns the physical register index of the i'th destination + * register. + */ + PhysRegIndex renamedDestRegIdx(int idx) const + { + return _destRegIdx[idx]; + } + + /** Returns the physical register index of the i'th source register. */ + PhysRegIndex renamedSrcRegIdx(int idx) const + { + return _srcRegIdx[idx]; + } + + /** Returns the physical register index of the previous physical register + * that remapped to the same logical register index. + */ + PhysRegIndex prevDestRegIdx(int idx) const + { + return _prevDestRegIdx[idx]; + } + + /** Renames a destination register to a physical register. Also records + * the previous physical register that the logical register mapped to. + */ + void renameDestReg(int idx, + PhysRegIndex renamed_dest, + PhysRegIndex previous_rename) + { + _destRegIdx[idx] = renamed_dest; + _prevDestRegIdx[idx] = previous_rename; + } + + /** Renames a source logical register to the physical register which + * has/will produce that logical register's result. + * @todo: add in whether or not the source register is ready. + */ + void renameSrcReg(int idx, PhysRegIndex renamed_src) + { + _srcRegIdx[idx] = renamed_src; + } + + public: + /** Calculates EA part of a memory instruction. Currently unused, + * though it may be useful in the future if we want to split + * memory operations into EA calculation and memory access parts. + */ + Fault calcEA() + { + return this->staticInst->eaCompInst()->execute(this, this->traceData); + } + + /** Does the memory access part of a memory instruction. Currently unused, + * though it may be useful in the future if we want to split + * memory operations into EA calculation and memory access parts. + */ + Fault memAccess() + { + return this->staticInst->memAccInst()->execute(this, this->traceData); + } +}; + +#endif // __CPU_O3_MIPS_DYN_INST_HH__ + diff --git a/src/cpu/o3/mips/dyn_inst_impl.hh b/src/cpu/o3/mips/dyn_inst_impl.hh new file mode 100755 index 000000000..57dec1ccf --- /dev/null +++ b/src/cpu/o3/mips/dyn_inst_impl.hh @@ -0,0 +1,116 @@ +/* + * Copyright (c) 2004-2006 The Regents of The University of Michigan + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are + * met: redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer; + * redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution; + * neither the name of the copyright holders nor the names of its + * contributors may be used to endorse or promote products derived from + * this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + * Authors: Kevin Lim + */ + +#include "cpu/o3/mips/dyn_inst.hh" + +template <class Impl> +MipsDynInst<Impl>::MipsDynInst(ExtMachInst inst, Addr PC, Addr Pred_PC, + InstSeqNum seq_num, O3CPU *cpu) + : BaseDynInst<Impl>(inst, PC, Pred_PC, seq_num, cpu) +{ + initVars(); +} + +template <class Impl> +MipsDynInst<Impl>::MipsDynInst(StaticInstPtr &_staticInst) + : BaseDynInst<Impl>(_staticInst) +{ + initVars(); +} + +template <class Impl> +void +MipsDynInst<Impl>::initVars() +{ + // Make sure to have the renamed register entries set to the same + // as the normal register entries. It will allow the IQ to work + // without any modifications. + for (int i = 0; i < this->staticInst->numDestRegs(); i++) { + _destRegIdx[i] = this->staticInst->destRegIdx(i); + } + + for (int i = 0; i < this->staticInst->numSrcRegs(); i++) { + _srcRegIdx[i] = this->staticInst->srcRegIdx(i); + this->_readySrcRegIdx[i] = 0; + } +} + +template <class Impl> +Fault +MipsDynInst<Impl>::execute() +{ + // @todo: Pretty convoluted way to avoid squashing from happening + // when using the TC during an instruction's execution + // (specifically for instructions that have side-effects that use + // the TC). Fix this. + bool in_syscall = this->thread->inSyscall; + this->thread->inSyscall = true; + + this->fault = this->staticInst->execute(this, this->traceData); + + this->thread->inSyscall = in_syscall; + + return this->fault; +} + +template <class Impl> +Fault +MipsDynInst<Impl>::initiateAcc() +{ + // @todo: Pretty convoluted way to avoid squashing from happening + // when using the TC during an instruction's execution + // (specifically for instructions that have side-effects that use + // the TC). Fix this. + bool in_syscall = this->thread->inSyscall; + this->thread->inSyscall = true; + + this->fault = this->staticInst->initiateAcc(this, this->traceData); + + this->thread->inSyscall = in_syscall; + + return this->fault; +} + +template <class Impl> +Fault +MipsDynInst<Impl>::completeAcc(Packet *pkt) +{ + this->fault = this->staticInst->completeAcc(pkt, this, this->traceData); + + return this->fault; +} + +template <class Impl> +void +MipsDynInst<Impl>::syscall(int64_t callnum) +{ + this->cpu->syscall(callnum, this->threadNumber); +} + diff --git a/src/cpu/o3/mips/impl.hh b/src/cpu/o3/mips/impl.hh new file mode 100644 index 000000000..ac7181a19 --- /dev/null +++ b/src/cpu/o3/mips/impl.hh @@ -0,0 +1,93 @@ +/* + * Copyright (c) 2006 The Regents of The University of Michigan + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are + * met: redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer; + * redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution; + * neither the name of the copyright holders nor the names of its + * contributors may be used to endorse or promote products derived from + * this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + * Authors: Kevin Lim + * Korey Sewell + */ + +#ifndef __CPU_O3_MIPS_IMPL_HH__ +#define __CPU_O3_MIPS_IMPL_HH__ + +#include "arch/mips/isa_traits.hh" + +#include "cpu/o3/mips/params.hh" +#include "cpu/o3/cpu_policy.hh" + + +// Forward declarations. +template <class Impl> +class MipsDynInst; + +template <class Impl> +class MipsO3CPU; + +/** Implementation specific struct that defines several key types to the + * CPU, the stages within the CPU, the time buffers, and the DynInst. + * The struct defines the ISA, the CPU policy, the specific DynInst, the + * specific O3CPU, and all of the structs from the time buffers to do + * communication. + * This is one of the key things that must be defined for each hardware + * specific CPU implementation. + */ +struct MipsSimpleImpl +{ + /** The type of MachInst. */ + typedef TheISA::MachInst MachInst; + + /** The CPU policy to be used, which defines all of the CPU stages. */ + typedef SimpleCPUPolicy<MipsSimpleImpl> CPUPol; + + /** The DynInst type to be used. */ + typedef MipsDynInst<MipsSimpleImpl> DynInst; + + /** The refcounted DynInst pointer to be used. In most cases this is + * what should be used, and not DynInst *. + */ + typedef RefCountingPtr<DynInst> DynInstPtr; + + /** The O3CPU type to be used. */ + typedef MipsO3CPU<MipsSimpleImpl> O3CPU; + + /** Same typedef, but for CPUType. BaseDynInst may not always use + * an O3 CPU, so it's clearer to call it CPUType instead in that + * case. + */ + typedef O3CPU CPUType; + + /** The Params to be passed to each stage. */ + typedef MipsSimpleParams Params; + + enum { + MaxWidth = 8, + MaxThreads = 4 + }; +}; + +/** The O3Impl to be used. */ +typedef MipsSimpleImpl O3CPUImpl; + +#endif // __CPU_O3_MIPS_IMPL_HH__ diff --git a/src/cpu/o3/mips/params.hh b/src/cpu/o3/mips/params.hh new file mode 100644 index 000000000..d1ac62e21 --- /dev/null +++ b/src/cpu/o3/mips/params.hh @@ -0,0 +1,63 @@ +/* + * Copyright (c) 2006 The Regents of The University of Michigan + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are + * met: redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer; + * redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution; + * neither the name of the copyright holders nor the names of its + * contributors may be used to endorse or promote products derived from + * this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + * Authors: Kevin Lim + * Korey Sewell + */ + +#ifndef __CPU_O3_MIPS_PARAMS_HH__ +#define __CPU_O3_MIPS_PARAMS_HH__ + +#include "cpu/o3/cpu.hh" +#include "cpu/o3/params.hh" + +//Forward declarations +//class MipsDTB; +//class MipsITB; +class MemObject; +class Process; +class System; + +/** + * This file defines the parameters that will be used for the MipsO3CPU. + * This must be defined externally so that the Impl can have a params class + * defined that it can pass to all of the individual stages. + */ + +class MipsSimpleParams : public O3Params +{ + public: + MipsSimpleParams() {} + +#if FULL_SYSTEM + //Full System Paramater Objects place here + MipsITB *itb; + MipsDTB *dtb; +#endif +}; + +#endif // __CPU_O3_MIPS_PARAMS_HH__ diff --git a/src/cpu/o3/mips/thread_context.cc b/src/cpu/o3/mips/thread_context.cc new file mode 100755 index 000000000..0061a2a63 --- /dev/null +++ b/src/cpu/o3/mips/thread_context.cc @@ -0,0 +1,36 @@ +/* + * Copyright (c) 2006 The Regents of The University of Michigan + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are + * met: redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer; + * redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution; + * neither the name of the copyright holders nor the names of its + * contributors may be used to endorse or promote products derived from + * this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + * Authors: Kevin Lim + * Korey Sewell + */ + +#include "cpu/o3/thread_context.hh" +#include "cpu/o3/thread_context_impl.hh" + +template class O3ThreadContext<MipsSimpleImpl>; + diff --git a/src/cpu/o3/mips/thread_context.hh b/src/cpu/o3/mips/thread_context.hh new file mode 100644 index 000000000..26b1e2e7f --- /dev/null +++ b/src/cpu/o3/mips/thread_context.hh @@ -0,0 +1,68 @@ +/* + * Copyright (c) 2006 The Regents of The University of Michigan + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are + * met: redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer; + * redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution; + * neither the name of the copyright holders nor the names of its + * contributors may be used to endorse or promote products derived from + * this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + * Authors: Kevin Lim + * Korey Sewell + */ + +#include "arch/mips/types.hh" +#include "cpu/o3/thread_context.hh" + +template <class Impl> +class MipsTC : public O3ThreadContext<Impl> +{ + public: + virtual uint64_t readNextNPC() + { + return this->cpu->readNextNPC(this->thread->readTid()); + } + + virtual void setNextNPC(uint64_t val) + { + this->cpu->setNextNPC(val, this->thread->readTid()); + } + + virtual void changeRegFileContext(TheISA::RegContextParam param, + TheISA::RegContextVal val) + { panic("Not supported on Mips!"); } + + /** This function exits the thread context in the CPU and returns + * 1 if the CPU has no more active threads (meaning it's OK to exit); + * Used in syscall-emulation mode when a thread executes the 'exit' + * syscall. + */ + virtual int exit() + { + this->deallocate(); + + // If there are still threads executing in the system + if (this->cpu->numActiveThreads()) + return 0; // don't exit simulation + else + return 1; // exit simulation + } +}; diff --git a/src/cpu/o3/params.hh b/src/cpu/o3/params.hh new file mode 100755 index 000000000..1c234bcd7 --- /dev/null +++ b/src/cpu/o3/params.hh @@ -0,0 +1,182 @@ +/* + * Copyright (c) 2004-2006 The Regents of The University of Michigan + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are + * met: redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer; + * redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution; + * neither the name of the copyright holders nor the names of its + * contributors may be used to endorse or promote products derived from + * this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + * Authors: Kevin Lim + */ + +#ifndef __CPU_O3_PARAMS_HH__ +#define __CPU_O3_PARAMS_HH__ + +#include "cpu/o3/cpu.hh" + +//Forward declarations +class FUPool; + +/** + * This file defines the parameters that will be used for the O3CPU. + * This must be defined externally so that the Impl can have a params class + * defined that it can pass to all of the individual stages. + */ +class O3Params : public BaseO3CPU::Params +{ + public: + unsigned activity; + + // + // Pointers to key objects + // +#if !FULL_SYSTEM + std::vector<Process *> workload; + Process *process; +#endif // FULL_SYSTEM + + MemObject *mem; + + BaseCPU *checker; + + // + // Caches + // + // MemInterface *icacheInterface; + // MemInterface *dcacheInterface; + + unsigned cachePorts; + + // + // Fetch + // + unsigned decodeToFetchDelay; + unsigned renameToFetchDelay; + unsigned iewToFetchDelay; + unsigned commitToFetchDelay; + unsigned fetchWidth; + + // + // Decode + // + unsigned renameToDecodeDelay; + unsigned iewToDecodeDelay; + unsigned commitToDecodeDelay; + unsigned fetchToDecodeDelay; + unsigned decodeWidth; + + // + // Rename + // + unsigned iewToRenameDelay; + unsigned commitToRenameDelay; + unsigned decodeToRenameDelay; + unsigned renameWidth; + + // + // IEW + // + unsigned commitToIEWDelay; + unsigned renameToIEWDelay; + unsigned issueToExecuteDelay; + unsigned dispatchWidth; + unsigned issueWidth; + unsigned wbWidth; + unsigned wbDepth; + FUPool *fuPool; + + // + // Commit + // + unsigned iewToCommitDelay; + unsigned renameToROBDelay; + unsigned commitWidth; + unsigned squashWidth; + Tick trapLatency; + Tick fetchTrapLatency; + + // + // Timebuffer sizes + // + unsigned backComSize; + unsigned forwardComSize; + + // + // Branch predictor (BP, BTB, RAS) + // + std::string predType; + unsigned localPredictorSize; + unsigned localCtrBits; + unsigned localHistoryTableSize; + unsigned localHistoryBits; + unsigned globalPredictorSize; + unsigned globalCtrBits; + unsigned globalHistoryBits; + unsigned choicePredictorSize; + unsigned choiceCtrBits; + + unsigned BTBEntries; + unsigned BTBTagSize; + + unsigned RASSize; + + // + // Load store queue + // + unsigned LQEntries; + unsigned SQEntries; + + // + // Memory dependence + // + unsigned SSITSize; + unsigned LFSTSize; + + // + // Miscellaneous + // + unsigned numPhysIntRegs; + unsigned numPhysFloatRegs; + unsigned numIQEntries; + unsigned numROBEntries; + + //SMT Parameters + unsigned smtNumFetchingThreads; + + std::string smtFetchPolicy; + + std::string smtIQPolicy; + unsigned smtIQThreshold; + + std::string smtLSQPolicy; + unsigned smtLSQThreshold; + + std::string smtCommitPolicy; + + std::string smtROBPolicy; + unsigned smtROBThreshold; + + // Probably can get this from somewhere. + unsigned instShiftAmt; +}; + +#endif // __CPU_O3_ALPHA_PARAMS_HH__ diff --git a/src/cpu/o3/ras.cc b/src/cpu/o3/ras.cc new file mode 100644 index 000000000..f9939259a --- /dev/null +++ b/src/cpu/o3/ras.cc @@ -0,0 +1,84 @@ +/* + * Copyright (c) 2004-2005 The Regents of The University of Michigan + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are + * met: redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer; + * redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution; + * neither the name of the copyright holders nor the names of its + * contributors may be used to endorse or promote products derived from + * this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + * Authors: Kevin Lim + */ + +#include "cpu/o3/ras.hh" + +void +ReturnAddrStack::init(unsigned _numEntries) +{ + numEntries = _numEntries; + usedEntries = 0; + tos = 0; + + addrStack.resize(numEntries); + + for (int i = 0; i < numEntries; ++i) + addrStack[i] = 0; +} + +void +ReturnAddrStack::reset() +{ + usedEntries = 0; + tos = 0; + for (int i = 0; i < numEntries; ++i) + addrStack[i] = 0; +} + +void +ReturnAddrStack::push(const Addr &return_addr) +{ + incrTos(); + + addrStack[tos] = return_addr; + + if (usedEntries != numEntries) { + ++usedEntries; + } +} + +void +ReturnAddrStack::pop() +{ + if (usedEntries > 0) { + --usedEntries; + } + + decrTos(); +} + +void +ReturnAddrStack::restore(unsigned top_entry_idx, + const Addr &restored_target) +{ + tos = top_entry_idx; + + addrStack[tos] = restored_target; +} diff --git a/src/cpu/o3/ras.hh b/src/cpu/o3/ras.hh new file mode 100644 index 000000000..97846ed16 --- /dev/null +++ b/src/cpu/o3/ras.hh @@ -0,0 +1,96 @@ +/* + * Copyright (c) 2004-2005 The Regents of The University of Michigan + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are + * met: redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer; + * redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution; + * neither the name of the copyright holders nor the names of its + * contributors may be used to endorse or promote products derived from + * this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + * Authors: Kevin Lim + */ + +#ifndef __CPU_O3_RAS_HH__ +#define __CPU_O3_RAS_HH__ + +#include "sim/host.hh" +#include <vector> + +/** Return address stack class, implements a simple RAS. */ +class ReturnAddrStack +{ + public: + /** Creates a return address stack, but init() must be called prior to + * use. + */ + ReturnAddrStack() {} + + /** Initializes RAS with a specified number of entries. + * @param numEntries Number of entries in the RAS. + */ + void init(unsigned numEntries); + + void reset(); + + /** Returns the top address on the RAS. */ + Addr top() + { return addrStack[tos]; } + + /** Returns the index of the top of the RAS. */ + unsigned topIdx() + { return tos; } + + /** Pushes an address onto the RAS. */ + void push(const Addr &return_addr); + + /** Pops the top address from the RAS. */ + void pop(); + + /** Changes index to the top of the RAS, and replaces the top address with + * a new target. + * @param top_entry_idx The index of the RAS that will now be the top. + * @param restored_target The new target address of the new top of the RAS. + */ + void restore(unsigned top_entry_idx, const Addr &restored_target); + + private: + /** Increments the top of stack index. */ + inline void incrTos() + { if (++tos == numEntries) tos = 0; } + + /** Decrements the top of stack index. */ + inline void decrTos() + { tos = (tos == 0 ? numEntries - 1 : tos - 1); } + + /** The RAS itself. */ + std::vector<Addr> addrStack; + + /** The number of entries in the RAS. */ + unsigned numEntries; + + /** The number of used entries in the RAS. */ + unsigned usedEntries; + + /** The top of stack index. */ + unsigned tos; +}; + +#endif // __CPU_O3_RAS_HH__ diff --git a/src/cpu/o3/regfile.hh b/src/cpu/o3/regfile.hh new file mode 100644 index 000000000..512cf0721 --- /dev/null +++ b/src/cpu/o3/regfile.hh @@ -0,0 +1,306 @@ +/* + * Copyright (c) 2004-2005 The Regents of The University of Michigan + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are + * met: redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer; + * redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution; + * neither the name of the copyright holders nor the names of its + * contributors may be used to endorse or promote products derived from + * this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + * Authors: Kevin Lim + * Gabe Black + */ + +#ifndef __CPU_O3_REGFILE_HH__ +#define __CPU_O3_REGFILE_HH__ + +#include "arch/isa_traits.hh" +#include "arch/types.hh" +#include "base/trace.hh" +#include "config/full_system.hh" +#include "cpu/o3/comm.hh" +#include "sim/faults.hh" + +#if FULL_SYSTEM +#include "kern/kernel_stats.hh" + +#endif + +#include <vector> + +/** + * Simple physical register file class. + * Right now this is specific to Alpha until we decide if/how to make things + * generic enough to support other ISAs. + */ +template <class Impl> +class PhysRegFile +{ + protected: + typedef TheISA::IntReg IntReg; + typedef TheISA::FloatReg FloatReg; + typedef TheISA::FloatRegBits FloatRegBits; + typedef TheISA::MiscRegFile MiscRegFile; + typedef TheISA::MiscReg MiscReg; + + typedef union { + FloatReg d; + FloatRegBits q; + } PhysFloatReg; + + // Note that most of the definitions of the IntReg, FloatReg, etc. exist + // within the Impl/ISA class and not within this PhysRegFile class. + + // Will make these registers public for now, but they probably should + // be private eventually with some accessor functions. + public: + typedef typename Impl::O3CPU O3CPU; + + /** + * Constructs a physical register file with the specified amount of + * integer and floating point registers. + */ + PhysRegFile(unsigned _numPhysicalIntRegs, + unsigned _numPhysicalFloatRegs); + + //Everything below should be pretty well identical to the normal + //register file that exists within AlphaISA class. + //The duplication is unfortunate but it's better than having + //different ways to access certain registers. + + /** Reads an integer register. */ + uint64_t readIntReg(PhysRegIndex reg_idx) + { + assert(reg_idx < numPhysicalIntRegs); + + DPRINTF(IEW, "RegFile: Access to int register %i, has data " + "%#x\n", int(reg_idx), intRegFile[reg_idx]); + return intRegFile[reg_idx]; + } + + FloatReg readFloatReg(PhysRegIndex reg_idx, int width) + { + // Remove the base Float reg dependency. + reg_idx = reg_idx - numPhysicalIntRegs; + + assert(reg_idx < numPhysicalFloatRegs + numPhysicalIntRegs); + + FloatReg floatReg = floatRegFile[reg_idx].d; + + DPRINTF(IEW, "RegFile: Access to %d byte float register %i, has " + "data %#x\n", int(reg_idx), floatRegFile[reg_idx].q); + + return floatReg; + } + + /** Reads a floating point register (double precision). */ + FloatReg readFloatReg(PhysRegIndex reg_idx) + { + // Remove the base Float reg dependency. + reg_idx = reg_idx - numPhysicalIntRegs; + + assert(reg_idx < numPhysicalFloatRegs + numPhysicalIntRegs); + + FloatReg floatReg = floatRegFile[reg_idx].d; + + DPRINTF(IEW, "RegFile: Access to float register %i, has " + "data %#x\n", int(reg_idx), floatRegFile[reg_idx].q); + + return floatReg; + } + + /** Reads a floating point register as an integer. */ + FloatRegBits readFloatRegBits(PhysRegIndex reg_idx, int width) + { + // Remove the base Float reg dependency. + reg_idx = reg_idx - numPhysicalIntRegs; + + assert(reg_idx < numPhysicalFloatRegs + numPhysicalIntRegs); + + FloatRegBits floatRegBits = floatRegFile[reg_idx].q; + + DPRINTF(IEW, "RegFile: Access to float register %i as int, " + "has data %#x\n", int(reg_idx), (uint64_t)floatRegBits); + + return floatRegBits; + } + + FloatRegBits readFloatRegBits(PhysRegIndex reg_idx) + { + // Remove the base Float reg dependency. + reg_idx = reg_idx - numPhysicalIntRegs; + + assert(reg_idx < numPhysicalFloatRegs + numPhysicalIntRegs); + + FloatRegBits floatRegBits = floatRegFile[reg_idx].q; + + DPRINTF(IEW, "RegFile: Access to float register %i as int, " + "has data %#x\n", int(reg_idx), (uint64_t)floatRegBits); + + return floatRegBits; + } + + /** Sets an integer register to the given value. */ + void setIntReg(PhysRegIndex reg_idx, uint64_t val) + { + assert(reg_idx < numPhysicalIntRegs); + + DPRINTF(IEW, "RegFile: Setting int register %i to %#x\n", + int(reg_idx), val); + + if (reg_idx != TheISA::ZeroReg) + intRegFile[reg_idx] = val; + } + + /** Sets a single precision floating point register to the given value. */ + void setFloatReg(PhysRegIndex reg_idx, FloatReg val, int width) + { + // Remove the base Float reg dependency. + reg_idx = reg_idx - numPhysicalIntRegs; + + assert(reg_idx < numPhysicalFloatRegs + numPhysicalIntRegs); + + DPRINTF(IEW, "RegFile: Setting float register %i to %#x\n", + int(reg_idx), (uint64_t)val); + + if (reg_idx != TheISA::ZeroReg) + floatRegFile[reg_idx].d = val; + } + + /** Sets a double precision floating point register to the given value. */ + void setFloatReg(PhysRegIndex reg_idx, FloatReg val) + { + // Remove the base Float reg dependency. + reg_idx = reg_idx - numPhysicalIntRegs; + + assert(reg_idx < numPhysicalFloatRegs + numPhysicalIntRegs); + + DPRINTF(IEW, "RegFile: Setting float register %i to %#x\n", + int(reg_idx), (uint64_t)val); + + if (reg_idx != TheISA::ZeroReg) + floatRegFile[reg_idx].d = val; + } + + /** Sets a floating point register to the given integer value. */ + void setFloatRegBits(PhysRegIndex reg_idx, FloatRegBits val, int width) + { + // Remove the base Float reg dependency. + reg_idx = reg_idx - numPhysicalIntRegs; + + assert(reg_idx < numPhysicalFloatRegs + numPhysicalIntRegs); + + DPRINTF(IEW, "RegFile: Setting float register %i to %#x\n", + int(reg_idx), (uint64_t)val); + + floatRegFile[reg_idx].q = val; + } + + void setFloatRegBits(PhysRegIndex reg_idx, FloatRegBits val) + { + // Remove the base Float reg dependency. + reg_idx = reg_idx - numPhysicalIntRegs; + + assert(reg_idx < numPhysicalFloatRegs + numPhysicalIntRegs); + + DPRINTF(IEW, "RegFile: Setting float register %i to %#x\n", + int(reg_idx), (uint64_t)val); + + floatRegFile[reg_idx].q = val; + } + + MiscReg readMiscReg(int misc_reg, unsigned thread_id) + { + return miscRegs[thread_id].readReg(misc_reg); + } + + MiscReg readMiscRegWithEffect(int misc_reg, Fault &fault, + unsigned thread_id) + { + return miscRegs[thread_id].readRegWithEffect(misc_reg, fault, + cpu->tcBase(thread_id)); + } + + Fault setMiscReg(int misc_reg, const MiscReg &val, unsigned thread_id) + { + return miscRegs[thread_id].setReg(misc_reg, val); + } + + Fault setMiscRegWithEffect(int misc_reg, const MiscReg &val, + unsigned thread_id) + { + return miscRegs[thread_id].setRegWithEffect(misc_reg, val, + cpu->tcBase(thread_id)); + } + +#if FULL_SYSTEM + int readIntrFlag() { return intrflag; } + /** Sets an interrupt flag. */ + void setIntrFlag(int val) { intrflag = val; } +#endif + + public: + /** (signed) integer register file. */ + IntReg *intRegFile; + + /** Floating point register file. */ + PhysFloatReg *floatRegFile; + + /** Miscellaneous register file. */ + MiscRegFile miscRegs[Impl::MaxThreads]; + +#if FULL_SYSTEM + private: + int intrflag; // interrupt flag +#endif + + private: + /** CPU pointer. */ + O3CPU *cpu; + + public: + /** Sets the CPU pointer. */ + void setCPU(O3CPU *cpu_ptr) { cpu = cpu_ptr; } + + /** Number of physical integer registers. */ + unsigned numPhysicalIntRegs; + /** Number of physical floating point registers. */ + unsigned numPhysicalFloatRegs; +}; + +template <class Impl> +PhysRegFile<Impl>::PhysRegFile(unsigned _numPhysicalIntRegs, + unsigned _numPhysicalFloatRegs) + : numPhysicalIntRegs(_numPhysicalIntRegs), + numPhysicalFloatRegs(_numPhysicalFloatRegs) +{ + intRegFile = new IntReg[numPhysicalIntRegs]; + floatRegFile = new PhysFloatReg[numPhysicalFloatRegs]; + + for (int i = 0; i < Impl::MaxThreads; ++i) { + miscRegs[i].clear(); + } + + memset(intRegFile, 0, sizeof(IntReg) * numPhysicalIntRegs); + memset(floatRegFile, 0, sizeof(PhysFloatReg) * numPhysicalFloatRegs); +} + +#endif diff --git a/src/cpu/o3/rename.cc b/src/cpu/o3/rename.cc new file mode 100644 index 000000000..443ada0cb --- /dev/null +++ b/src/cpu/o3/rename.cc @@ -0,0 +1,34 @@ +/* + * Copyright (c) 2004-2005 The Regents of The University of Michigan + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are + * met: redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer; + * redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution; + * neither the name of the copyright holders nor the names of its + * contributors may be used to endorse or promote products derived from + * this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + * Authors: Kevin Lim + */ + +#include "cpu/o3/isa_specific.hh" +#include "cpu/o3/rename_impl.hh" + +template class DefaultRename<O3CPUImpl>; diff --git a/src/cpu/o3/rename.hh b/src/cpu/o3/rename.hh new file mode 100644 index 000000000..177b9cb87 --- /dev/null +++ b/src/cpu/o3/rename.hh @@ -0,0 +1,478 @@ +/* + * Copyright (c) 2004-2006 The Regents of The University of Michigan + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are + * met: redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer; + * redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution; + * neither the name of the copyright holders nor the names of its + * contributors may be used to endorse or promote products derived from + * this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + * Authors: Kevin Lim + */ + +#ifndef __CPU_O3_RENAME_HH__ +#define __CPU_O3_RENAME_HH__ + +#include <list> + +#include "base/statistics.hh" +#include "base/timebuf.hh" + +/** + * DefaultRename handles both single threaded and SMT rename. Its + * width is specified by the parameters; each cycle it tries to rename + * that many instructions. It holds onto the rename history of all + * instructions with destination registers, storing the + * arch. register, the new physical register, and the old physical + * register, to allow for undoing of mappings if squashing happens, or + * freeing up registers upon commit. Rename handles blocking if the + * ROB, IQ, or LSQ is going to be full. Rename also handles barriers, + * and does so by stalling on the instruction until the ROB is empty + * and there are no instructions in flight to the ROB. + */ +template<class Impl> +class DefaultRename +{ + public: + // Typedefs from the Impl. + typedef typename Impl::CPUPol CPUPol; + typedef typename Impl::DynInstPtr DynInstPtr; + typedef typename Impl::O3CPU O3CPU; + typedef typename Impl::Params Params; + + // Typedefs from the CPUPol + typedef typename CPUPol::DecodeStruct DecodeStruct; + typedef typename CPUPol::RenameStruct RenameStruct; + typedef typename CPUPol::TimeStruct TimeStruct; + typedef typename CPUPol::FreeList FreeList; + typedef typename CPUPol::RenameMap RenameMap; + // These are used only for initialization. + typedef typename CPUPol::IEW IEW; + typedef typename CPUPol::Commit Commit; + + // Typedefs from the ISA. + typedef TheISA::RegIndex RegIndex; + + // A list is used to queue the instructions. Barrier insts must + // be added to the front of the list, which is the only reason for + // using a list instead of a queue. (Most other stages use a + // queue) + typedef std::list<DynInstPtr> InstQueue; + typedef typename std::list<DynInstPtr>::iterator ListIt; + + public: + /** Overall rename status. Used to determine if the CPU can + * deschedule itself due to a lack of activity. + */ + enum RenameStatus { + Active, + Inactive + }; + + /** Individual thread status. */ + enum ThreadStatus { + Running, + Idle, + StartSquash, + Squashing, + Blocked, + Unblocking, + SerializeStall + }; + + private: + /** Rename status. */ + RenameStatus _status; + + /** Per-thread status. */ + ThreadStatus renameStatus[Impl::MaxThreads]; + + public: + /** DefaultRename constructor. */ + DefaultRename(Params *params); + + /** Returns the name of rename. */ + std::string name() const; + + /** Registers statistics. */ + void regStats(); + + /** Sets CPU pointer. */ + void setCPU(O3CPU *cpu_ptr); + + /** Sets the main backwards communication time buffer pointer. */ + void setTimeBuffer(TimeBuffer<TimeStruct> *tb_ptr); + + /** Sets pointer to time buffer used to communicate to the next stage. */ + void setRenameQueue(TimeBuffer<RenameStruct> *rq_ptr); + + /** Sets pointer to time buffer coming from decode. */ + void setDecodeQueue(TimeBuffer<DecodeStruct> *dq_ptr); + + /** Sets pointer to IEW stage. Used only for initialization. */ + void setIEWStage(IEW *iew_stage) + { iew_ptr = iew_stage; } + + /** Sets pointer to commit stage. Used only for initialization. */ + void setCommitStage(Commit *commit_stage) + { commit_ptr = commit_stage; } + + private: + /** Pointer to IEW stage. Used only for initialization. */ + IEW *iew_ptr; + + /** Pointer to commit stage. Used only for initialization. */ + Commit *commit_ptr; + + public: + /** Initializes variables for the stage. */ + void initStage(); + + /** Sets pointer to list of active threads. */ + void setActiveThreads(std::list<unsigned> *at_ptr); + + /** Sets pointer to rename maps (per-thread structures). */ + void setRenameMap(RenameMap rm_ptr[Impl::MaxThreads]); + + /** Sets pointer to the free list. */ + void setFreeList(FreeList *fl_ptr); + + /** Sets pointer to the scoreboard. */ + void setScoreboard(Scoreboard *_scoreboard); + + /** Drains the rename stage. */ + bool drain(); + + /** Resumes execution after a drain. */ + void resume() { } + + /** Switches out the rename stage. */ + void switchOut(); + + /** Takes over from another CPU's thread. */ + void takeOverFrom(); + + /** Squashes all instructions in a thread. */ + void squash(const InstSeqNum &squash_seq_num, unsigned tid); + + /** Ticks rename, which processes all input signals and attempts to rename + * as many instructions as possible. + */ + void tick(); + + /** Debugging function used to dump history buffer of renamings. */ + void dumpHistory(); + + private: + /** Determines what to do based on rename's current status. + * @param status_change rename() sets this variable if there was a status + * change (ie switching from blocking to unblocking). + * @param tid Thread id to rename instructions from. + */ + void rename(bool &status_change, unsigned tid); + + /** Renames instructions for the given thread. Also handles serializing + * instructions. + */ + void renameInsts(unsigned tid); + + /** Inserts unused instructions from a given thread into the skid buffer, + * to be renamed once rename unblocks. + */ + void skidInsert(unsigned tid); + + /** Separates instructions from decode into individual lists of instructions + * sorted by thread. + */ + void sortInsts(); + + /** Returns if all of the skid buffers are empty. */ + bool skidsEmpty(); + + /** Updates overall rename status based on all of the threads' statuses. */ + void updateStatus(); + + /** Switches rename to blocking, and signals back that rename has become + * blocked. + * @return Returns true if there is a status change. + */ + bool block(unsigned tid); + + /** Switches rename to unblocking if the skid buffer is empty, and signals + * back that rename has unblocked. + * @return Returns true if there is a status change. + */ + bool unblock(unsigned tid); + + /** Executes actual squash, removing squashed instructions. */ + void doSquash(const InstSeqNum &squash_seq_num, unsigned tid); + + /** Removes a committed instruction's rename history. */ + void removeFromHistory(InstSeqNum inst_seq_num, unsigned tid); + + /** Renames the source registers of an instruction. */ + inline void renameSrcRegs(DynInstPtr &inst, unsigned tid); + + /** Renames the destination registers of an instruction. */ + inline void renameDestRegs(DynInstPtr &inst, unsigned tid); + + /** Calculates the number of free ROB entries for a specific thread. */ + inline int calcFreeROBEntries(unsigned tid); + + /** Calculates the number of free IQ entries for a specific thread. */ + inline int calcFreeIQEntries(unsigned tid); + + /** Calculates the number of free LSQ entries for a specific thread. */ + inline int calcFreeLSQEntries(unsigned tid); + + /** Returns the number of valid instructions coming from decode. */ + unsigned validInsts(); + + /** Reads signals telling rename to block/unblock. */ + void readStallSignals(unsigned tid); + + /** Checks if any stages are telling rename to block. */ + bool checkStall(unsigned tid); + + /** Gets the number of free entries for a specific thread. */ + void readFreeEntries(unsigned tid); + + /** Checks the signals and updates the status. */ + bool checkSignalsAndUpdate(unsigned tid); + + /** Either serializes on the next instruction available in the InstQueue, + * or records that it must serialize on the next instruction to enter + * rename. + * @param inst_list The list of younger, unprocessed instructions for the + * thread that has the serializeAfter instruction. + * @param tid The thread id. + */ + void serializeAfter(InstQueue &inst_list, unsigned tid); + + /** Holds the information for each destination register rename. It holds + * the instruction's sequence number, the arch register, the old physical + * register for that arch. register, and the new physical register. + */ + struct RenameHistory { + RenameHistory(InstSeqNum _instSeqNum, RegIndex _archReg, + PhysRegIndex _newPhysReg, PhysRegIndex _prevPhysReg) + : instSeqNum(_instSeqNum), archReg(_archReg), + newPhysReg(_newPhysReg), prevPhysReg(_prevPhysReg) + { + } + + /** The sequence number of the instruction that renamed. */ + InstSeqNum instSeqNum; + /** The architectural register index that was renamed. */ + RegIndex archReg; + /** The new physical register that the arch. register is renamed to. */ + PhysRegIndex newPhysReg; + /** The old physical register that the arch. register was renamed to. */ + PhysRegIndex prevPhysReg; + }; + + /** A per-thread list of all destination register renames, used to either + * undo rename mappings or free old physical registers. + */ + std::list<RenameHistory> historyBuffer[Impl::MaxThreads]; + + /** Pointer to CPU. */ + O3CPU *cpu; + + /** Pointer to main time buffer used for backwards communication. */ + TimeBuffer<TimeStruct> *timeBuffer; + + /** Wire to get IEW's output from backwards time buffer. */ + typename TimeBuffer<TimeStruct>::wire fromIEW; + + /** Wire to get commit's output from backwards time buffer. */ + typename TimeBuffer<TimeStruct>::wire fromCommit; + + /** Wire to write infromation heading to previous stages. */ + typename TimeBuffer<TimeStruct>::wire toDecode; + + /** Rename instruction queue. */ + TimeBuffer<RenameStruct> *renameQueue; + + /** Wire to write any information heading to IEW. */ + typename TimeBuffer<RenameStruct>::wire toIEW; + + /** Decode instruction queue interface. */ + TimeBuffer<DecodeStruct> *decodeQueue; + + /** Wire to get decode's output from decode queue. */ + typename TimeBuffer<DecodeStruct>::wire fromDecode; + + /** Queue of all instructions coming from decode this cycle. */ + InstQueue insts[Impl::MaxThreads]; + + /** Skid buffer between rename and decode. */ + InstQueue skidBuffer[Impl::MaxThreads]; + + /** Rename map interface. */ + RenameMap *renameMap[Impl::MaxThreads]; + + /** Free list interface. */ + FreeList *freeList; + + /** Pointer to the list of active threads. */ + std::list<unsigned> *activeThreads; + + /** Pointer to the scoreboard. */ + Scoreboard *scoreboard; + + /** Count of instructions in progress that have been sent off to the IQ + * and ROB, but are not yet included in their occupancy counts. + */ + int instsInProgress[Impl::MaxThreads]; + + /** Variable that tracks if decode has written to the time buffer this + * cycle. Used to tell CPU if there is activity this cycle. + */ + bool wroteToTimeBuffer; + + /** Structures whose free entries impact the amount of instructions that + * can be renamed. + */ + struct FreeEntries { + unsigned iqEntries; + unsigned lsqEntries; + unsigned robEntries; + }; + + /** Per-thread tracking of the number of free entries of back-end + * structures. + */ + FreeEntries freeEntries[Impl::MaxThreads]; + + /** Records if the ROB is empty. In SMT mode the ROB may be dynamically + * partitioned between threads, so the ROB must tell rename when it is + * empty. + */ + bool emptyROB[Impl::MaxThreads]; + + /** Source of possible stalls. */ + struct Stalls { + bool iew; + bool commit; + }; + + /** Tracks which stages are telling decode to stall. */ + Stalls stalls[Impl::MaxThreads]; + + /** The serialize instruction that rename has stalled on. */ + DynInstPtr serializeInst[Impl::MaxThreads]; + + /** Records if rename needs to serialize on the next instruction for any + * thread. + */ + bool serializeOnNextInst[Impl::MaxThreads]; + + /** Delay between iew and rename, in ticks. */ + int iewToRenameDelay; + + /** Delay between decode and rename, in ticks. */ + int decodeToRenameDelay; + + /** Delay between commit and rename, in ticks. */ + unsigned commitToRenameDelay; + + /** Rename width, in instructions. */ + unsigned renameWidth; + + /** Commit width, in instructions. Used so rename knows how many + * instructions might have freed registers in the previous cycle. + */ + unsigned commitWidth; + + /** The index of the instruction in the time buffer to IEW that rename is + * currently using. + */ + unsigned toIEWIndex; + + /** Whether or not rename needs to block this cycle. */ + bool blockThisCycle; + + /** The number of threads active in rename. */ + unsigned numThreads; + + /** The maximum skid buffer size. */ + unsigned skidBufferMax; + + PhysRegIndex maxPhysicalRegs; + + /** Enum to record the source of a structure full stall. Can come from + * either ROB, IQ, LSQ, and it is priortized in that order. + */ + enum FullSource { + ROB, + IQ, + LSQ, + NONE + }; + + /** Function used to increment the stat that corresponds to the source of + * the stall. + */ + inline void incrFullStat(const FullSource &source); + + /** Stat for total number of cycles spent squashing. */ + Stats::Scalar<> renameSquashCycles; + /** Stat for total number of cycles spent idle. */ + Stats::Scalar<> renameIdleCycles; + /** Stat for total number of cycles spent blocking. */ + Stats::Scalar<> renameBlockCycles; + /** Stat for total number of cycles spent stalling for a serializing inst. */ + Stats::Scalar<> renameSerializeStallCycles; + /** Stat for total number of cycles spent running normally. */ + Stats::Scalar<> renameRunCycles; + /** Stat for total number of cycles spent unblocking. */ + Stats::Scalar<> renameUnblockCycles; + /** Stat for total number of renamed instructions. */ + Stats::Scalar<> renameRenamedInsts; + /** Stat for total number of squashed instructions that rename discards. */ + Stats::Scalar<> renameSquashedInsts; + /** Stat for total number of times that the ROB starts a stall in rename. */ + Stats::Scalar<> renameROBFullEvents; + /** Stat for total number of times that the IQ starts a stall in rename. */ + Stats::Scalar<> renameIQFullEvents; + /** Stat for total number of times that the LSQ starts a stall in rename. */ + Stats::Scalar<> renameLSQFullEvents; + /** Stat for total number of times that rename runs out of free registers + * to use to rename. */ + Stats::Scalar<> renameFullRegistersEvents; + /** Stat for total number of renamed destination registers. */ + Stats::Scalar<> renameRenamedOperands; + /** Stat for total number of source register rename lookups. */ + Stats::Scalar<> renameRenameLookups; + /** Stat for total number of committed renaming mappings. */ + Stats::Scalar<> renameCommittedMaps; + /** Stat for total number of mappings that were undone due to a squash. */ + Stats::Scalar<> renameUndoneMaps; + /** Number of serialize instructions handled. */ + Stats::Scalar<> renamedSerializing; + /** Number of instructions marked as temporarily serializing. */ + Stats::Scalar<> renamedTempSerializing; + /** Number of instructions inserted into skid buffers. */ + Stats::Scalar<> renameSkidInsts; +}; + +#endif // __CPU_O3_RENAME_HH__ diff --git a/src/cpu/o3/rename_impl.hh b/src/cpu/o3/rename_impl.hh new file mode 100644 index 000000000..248d7deb6 --- /dev/null +++ b/src/cpu/o3/rename_impl.hh @@ -0,0 +1,1331 @@ +/* + * Copyright (c) 2004-2006 The Regents of The University of Michigan + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are + * met: redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer; + * redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution; + * neither the name of the copyright holders nor the names of its + * contributors may be used to endorse or promote products derived from + * this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + * Authors: Kevin Lim + * Korey Sewell + */ + +#include <list> + +#include "config/full_system.hh" +#include "cpu/o3/rename.hh" + +template <class Impl> +DefaultRename<Impl>::DefaultRename(Params *params) + : iewToRenameDelay(params->iewToRenameDelay), + decodeToRenameDelay(params->decodeToRenameDelay), + commitToRenameDelay(params->commitToRenameDelay), + renameWidth(params->renameWidth), + commitWidth(params->commitWidth), + numThreads(params->numberOfThreads), + maxPhysicalRegs(params->numPhysIntRegs + params->numPhysFloatRegs) +{ + _status = Inactive; + + for (int i=0; i< numThreads; i++) { + renameStatus[i] = Idle; + + freeEntries[i].iqEntries = 0; + freeEntries[i].lsqEntries = 0; + freeEntries[i].robEntries = 0; + + stalls[i].iew = false; + stalls[i].commit = false; + serializeInst[i] = NULL; + + instsInProgress[i] = 0; + + emptyROB[i] = true; + + serializeOnNextInst[i] = false; + } + + // @todo: Make into a parameter. + skidBufferMax = (2 * (iewToRenameDelay * params->decodeWidth)) + renameWidth; +} + +template <class Impl> +std::string +DefaultRename<Impl>::name() const +{ + return cpu->name() + ".rename"; +} + +template <class Impl> +void +DefaultRename<Impl>::regStats() +{ + renameSquashCycles + .name(name() + ".RENAME:SquashCycles") + .desc("Number of cycles rename is squashing") + .prereq(renameSquashCycles); + renameIdleCycles + .name(name() + ".RENAME:IdleCycles") + .desc("Number of cycles rename is idle") + .prereq(renameIdleCycles); + renameBlockCycles + .name(name() + ".RENAME:BlockCycles") + .desc("Number of cycles rename is blocking") + .prereq(renameBlockCycles); + renameSerializeStallCycles + .name(name() + ".RENAME:serializeStallCycles") + .desc("count of cycles rename stalled for serializing inst") + .flags(Stats::total); + renameRunCycles + .name(name() + ".RENAME:RunCycles") + .desc("Number of cycles rename is running") + .prereq(renameIdleCycles); + renameUnblockCycles + .name(name() + ".RENAME:UnblockCycles") + .desc("Number of cycles rename is unblocking") + .prereq(renameUnblockCycles); + renameRenamedInsts + .name(name() + ".RENAME:RenamedInsts") + .desc("Number of instructions processed by rename") + .prereq(renameRenamedInsts); + renameSquashedInsts + .name(name() + ".RENAME:SquashedInsts") + .desc("Number of squashed instructions processed by rename") + .prereq(renameSquashedInsts); + renameROBFullEvents + .name(name() + ".RENAME:ROBFullEvents") + .desc("Number of times rename has blocked due to ROB full") + .prereq(renameROBFullEvents); + renameIQFullEvents + .name(name() + ".RENAME:IQFullEvents") + .desc("Number of times rename has blocked due to IQ full") + .prereq(renameIQFullEvents); + renameLSQFullEvents + .name(name() + ".RENAME:LSQFullEvents") + .desc("Number of times rename has blocked due to LSQ full") + .prereq(renameLSQFullEvents); + renameFullRegistersEvents + .name(name() + ".RENAME:FullRegisterEvents") + .desc("Number of times there has been no free registers") + .prereq(renameFullRegistersEvents); + renameRenamedOperands + .name(name() + ".RENAME:RenamedOperands") + .desc("Number of destination operands rename has renamed") + .prereq(renameRenamedOperands); + renameRenameLookups + .name(name() + ".RENAME:RenameLookups") + .desc("Number of register rename lookups that rename has made") + .prereq(renameRenameLookups); + renameCommittedMaps + .name(name() + ".RENAME:CommittedMaps") + .desc("Number of HB maps that are committed") + .prereq(renameCommittedMaps); + renameUndoneMaps + .name(name() + ".RENAME:UndoneMaps") + .desc("Number of HB maps that are undone due to squashing") + .prereq(renameUndoneMaps); + renamedSerializing + .name(name() + ".RENAME:serializingInsts") + .desc("count of serializing insts renamed") + .flags(Stats::total) + ; + renamedTempSerializing + .name(name() + ".RENAME:tempSerializingInsts") + .desc("count of temporary serializing insts renamed") + .flags(Stats::total) + ; + renameSkidInsts + .name(name() + ".RENAME:skidInsts") + .desc("count of insts added to the skid buffer") + .flags(Stats::total) + ; +} + +template <class Impl> +void +DefaultRename<Impl>::setCPU(O3CPU *cpu_ptr) +{ + DPRINTF(Rename, "Setting CPU pointer.\n"); + cpu = cpu_ptr; +} + +template <class Impl> +void +DefaultRename<Impl>::setTimeBuffer(TimeBuffer<TimeStruct> *tb_ptr) +{ + DPRINTF(Rename, "Setting time buffer pointer.\n"); + timeBuffer = tb_ptr; + + // Setup wire to read information from time buffer, from IEW stage. + fromIEW = timeBuffer->getWire(-iewToRenameDelay); + + // Setup wire to read infromation from time buffer, from commit stage. + fromCommit = timeBuffer->getWire(-commitToRenameDelay); + + // Setup wire to write information to previous stages. + toDecode = timeBuffer->getWire(0); +} + +template <class Impl> +void +DefaultRename<Impl>::setRenameQueue(TimeBuffer<RenameStruct> *rq_ptr) +{ + DPRINTF(Rename, "Setting rename queue pointer.\n"); + renameQueue = rq_ptr; + + // Setup wire to write information to future stages. + toIEW = renameQueue->getWire(0); +} + +template <class Impl> +void +DefaultRename<Impl>::setDecodeQueue(TimeBuffer<DecodeStruct> *dq_ptr) +{ + DPRINTF(Rename, "Setting decode queue pointer.\n"); + decodeQueue = dq_ptr; + + // Setup wire to get information from decode. + fromDecode = decodeQueue->getWire(-decodeToRenameDelay); +} + +template <class Impl> +void +DefaultRename<Impl>::initStage() +{ + // Grab the number of free entries directly from the stages. + for (int tid=0; tid < numThreads; tid++) { + freeEntries[tid].iqEntries = iew_ptr->instQueue.numFreeEntries(tid); + freeEntries[tid].lsqEntries = iew_ptr->ldstQueue.numFreeEntries(tid); + freeEntries[tid].robEntries = commit_ptr->numROBFreeEntries(tid); + emptyROB[tid] = true; + } +} + +template<class Impl> +void +DefaultRename<Impl>::setActiveThreads(std::list<unsigned> *at_ptr) +{ + DPRINTF(Rename, "Setting active threads list pointer.\n"); + activeThreads = at_ptr; +} + + +template <class Impl> +void +DefaultRename<Impl>::setRenameMap(RenameMap rm_ptr[]) +{ + DPRINTF(Rename, "Setting rename map pointers.\n"); + + for (int i=0; i<numThreads; i++) { + renameMap[i] = &rm_ptr[i]; + } +} + +template <class Impl> +void +DefaultRename<Impl>::setFreeList(FreeList *fl_ptr) +{ + DPRINTF(Rename, "Setting free list pointer.\n"); + freeList = fl_ptr; +} + +template<class Impl> +void +DefaultRename<Impl>::setScoreboard(Scoreboard *_scoreboard) +{ + DPRINTF(Rename, "Setting scoreboard pointer.\n"); + scoreboard = _scoreboard; +} + +template <class Impl> +bool +DefaultRename<Impl>::drain() +{ + // Rename is ready to switch out at any time. + cpu->signalDrained(); + return true; +} + +template <class Impl> +void +DefaultRename<Impl>::switchOut() +{ + // Clear any state, fix up the rename map. + for (int i = 0; i < numThreads; i++) { + typename std::list<RenameHistory>::iterator hb_it = + historyBuffer[i].begin(); + + while (!historyBuffer[i].empty()) { + assert(hb_it != historyBuffer[i].end()); + + DPRINTF(Rename, "[tid:%u]: Removing history entry with sequence " + "number %i.\n", i, (*hb_it).instSeqNum); + + // Tell the rename map to set the architected register to the + // previous physical register that it was renamed to. + renameMap[i]->setEntry(hb_it->archReg, hb_it->prevPhysReg); + + // Put the renamed physical register back on the free list. + freeList->addReg(hb_it->newPhysReg); + + // Be sure to mark its register as ready if it's a misc register. + if (hb_it->newPhysReg >= maxPhysicalRegs) { + scoreboard->setReg(hb_it->newPhysReg); + } + + historyBuffer[i].erase(hb_it++); + } + insts[i].clear(); + skidBuffer[i].clear(); + } +} + +template <class Impl> +void +DefaultRename<Impl>::takeOverFrom() +{ + _status = Inactive; + initStage(); + + // Reset all state prior to taking over from the other CPU. + for (int i=0; i< numThreads; i++) { + renameStatus[i] = Idle; + + stalls[i].iew = false; + stalls[i].commit = false; + serializeInst[i] = NULL; + + instsInProgress[i] = 0; + + emptyROB[i] = true; + + serializeOnNextInst[i] = false; + } +} + +template <class Impl> +void +DefaultRename<Impl>::squash(const InstSeqNum &squash_seq_num, unsigned tid) +{ + DPRINTF(Rename, "[tid:%u]: Squashing instructions.\n",tid); + + // Clear the stall signal if rename was blocked or unblocking before. + // If it still needs to block, the blocking should happen the next + // cycle and there should be space to hold everything due to the squash. + if (renameStatus[tid] == Blocked || + renameStatus[tid] == Unblocking || + renameStatus[tid] == SerializeStall) { + + toDecode->renameUnblock[tid] = 1; + + serializeInst[tid] = NULL; + } + + // Set the status to Squashing. + renameStatus[tid] = Squashing; + + // Squash any instructions from decode. + unsigned squashCount = 0; + + for (int i=0; i<fromDecode->size; i++) { + if (fromDecode->insts[i]->threadNumber == tid && + fromDecode->insts[i]->seqNum > squash_seq_num) { + fromDecode->insts[i]->setSquashed(); + wroteToTimeBuffer = true; + squashCount++; + } + + } + + // Clear the instruction list and skid buffer in case they have any + // insts in them. Since we support multiple ISAs, we cant just: + // "insts[tid].clear();" or "skidBuffer[tid].clear()" since there is + // a possible delay slot inst for different architectures + // insts[tid].clear(); +#if ISA_HAS_DELAY_SLOT + DPRINTF(Rename, "[tid:%i] Squashing incoming decode instructions until " + "[sn:%i].\n",tid, squash_seq_num); + ListIt ilist_it = insts[tid].begin(); + while (ilist_it != insts[tid].end()) { + if ((*ilist_it)->seqNum > squash_seq_num) { + (*ilist_it)->setSquashed(); + DPRINTF(Rename, "Squashing incoming decode instruction, " + "[tid:%i] [sn:%i] PC %08p.\n", tid, (*ilist_it)->seqNum, (*ilist_it)->PC); + } + ilist_it++; + } +#else + insts[tid].clear(); +#endif + + // Clear the skid buffer in case it has any data in it. + // See comments above. + // skidBuffer[tid].clear(); +#if ISA_HAS_DELAY_SLOT + DPRINTF(Rename, "[tid:%i] Squashing incoming skidbuffer instructions " + "until [sn:%i].\n", tid, squash_seq_num); + ListIt slist_it = skidBuffer[tid].begin(); + while (slist_it != skidBuffer[tid].end()) { + if ((*slist_it)->seqNum > squash_seq_num) { + (*slist_it)->setSquashed(); + DPRINTF(Rename, "Squashing skidbuffer instruction, [tid:%i] [sn:%i]" + "PC %08p.\n", tid, (*slist_it)->seqNum, (*slist_it)->PC); + } + slist_it++; + } +#else + skidBuffer[tid].clear(); +#endif + doSquash(squash_seq_num, tid); +} + +template <class Impl> +void +DefaultRename<Impl>::tick() +{ + wroteToTimeBuffer = false; + + blockThisCycle = false; + + bool status_change = false; + + toIEWIndex = 0; + + sortInsts(); + + std::list<unsigned>::iterator threads = (*activeThreads).begin(); + + // Check stall and squash signals. + while (threads != (*activeThreads).end()) { + unsigned tid = *threads++; + + DPRINTF(Rename, "Processing [tid:%i]\n", tid); + + status_change = checkSignalsAndUpdate(tid) || status_change; + + rename(status_change, tid); + } + + if (status_change) { + updateStatus(); + } + + if (wroteToTimeBuffer) { + DPRINTF(Activity, "Activity this cycle.\n"); + cpu->activityThisCycle(); + } + + threads = (*activeThreads).begin(); + + while (threads != (*activeThreads).end()) { + unsigned tid = *threads++; + + // If we committed this cycle then doneSeqNum will be > 0 + if (fromCommit->commitInfo[tid].doneSeqNum != 0 && + !fromCommit->commitInfo[tid].squash && + renameStatus[tid] != Squashing) { + + removeFromHistory(fromCommit->commitInfo[tid].doneSeqNum, + tid); + } + } + + // @todo: make into updateProgress function + for (int tid=0; tid < numThreads; tid++) { + instsInProgress[tid] -= fromIEW->iewInfo[tid].dispatched; + + assert(instsInProgress[tid] >=0); + } + +} + +template<class Impl> +void +DefaultRename<Impl>::rename(bool &status_change, unsigned tid) +{ + // If status is Running or idle, + // call renameInsts() + // If status is Unblocking, + // buffer any instructions coming from decode + // continue trying to empty skid buffer + // check if stall conditions have passed + + if (renameStatus[tid] == Blocked) { + ++renameBlockCycles; + } else if (renameStatus[tid] == Squashing) { + ++renameSquashCycles; + } else if (renameStatus[tid] == SerializeStall) { + ++renameSerializeStallCycles; + } + + if (renameStatus[tid] == Running || + renameStatus[tid] == Idle) { + DPRINTF(Rename, "[tid:%u]: Not blocked, so attempting to run " + "stage.\n", tid); + + renameInsts(tid); + } else if (renameStatus[tid] == Unblocking) { + renameInsts(tid); + + if (validInsts()) { + // Add the current inputs to the skid buffer so they can be + // reprocessed when this stage unblocks. + skidInsert(tid); + } + + // If we switched over to blocking, then there's a potential for + // an overall status change. + status_change = unblock(tid) || status_change || blockThisCycle; + } +} + +template <class Impl> +void +DefaultRename<Impl>::renameInsts(unsigned tid) +{ + // Instructions can be either in the skid buffer or the queue of + // instructions coming from decode, depending on the status. + int insts_available = renameStatus[tid] == Unblocking ? + skidBuffer[tid].size() : insts[tid].size(); + + // Check the decode queue to see if instructions are available. + // If there are no available instructions to rename, then do nothing. + if (insts_available == 0) { + DPRINTF(Rename, "[tid:%u]: Nothing to do, breaking out early.\n", + tid); + // Should I change status to idle? + ++renameIdleCycles; + return; + } else if (renameStatus[tid] == Unblocking) { + ++renameUnblockCycles; + } else if (renameStatus[tid] == Running) { + ++renameRunCycles; + } + + DynInstPtr inst; + + // Will have to do a different calculation for the number of free + // entries. + int free_rob_entries = calcFreeROBEntries(tid); + int free_iq_entries = calcFreeIQEntries(tid); + int free_lsq_entries = calcFreeLSQEntries(tid); + int min_free_entries = free_rob_entries; + + FullSource source = ROB; + + if (free_iq_entries < min_free_entries) { + min_free_entries = free_iq_entries; + source = IQ; + } + + if (free_lsq_entries < min_free_entries) { + min_free_entries = free_lsq_entries; + source = LSQ; + } + + // Check if there's any space left. + if (min_free_entries <= 0) { + DPRINTF(Rename, "[tid:%u]: Blocking due to no free ROB/IQ/LSQ " + "entries.\n" + "ROB has %i free entries.\n" + "IQ has %i free entries.\n" + "LSQ has %i free entries.\n", + tid, + free_rob_entries, + free_iq_entries, + free_lsq_entries); + + blockThisCycle = true; + + block(tid); + + incrFullStat(source); + + return; + } else if (min_free_entries < insts_available) { + DPRINTF(Rename, "[tid:%u]: Will have to block this cycle." + "%i insts available, but only %i insts can be " + "renamed due to ROB/IQ/LSQ limits.\n", + tid, insts_available, min_free_entries); + + insts_available = min_free_entries; + + blockThisCycle = true; + + incrFullStat(source); + } + + InstQueue &insts_to_rename = renameStatus[tid] == Unblocking ? + skidBuffer[tid] : insts[tid]; + + DPRINTF(Rename, "[tid:%u]: %i available instructions to " + "send iew.\n", tid, insts_available); + + DPRINTF(Rename, "[tid:%u]: %i insts pipelining from Rename | %i insts " + "dispatched to IQ last cycle.\n", + tid, instsInProgress[tid], fromIEW->iewInfo[tid].dispatched); + + // Handle serializing the next instruction if necessary. + if (serializeOnNextInst[tid]) { + if (emptyROB[tid] && instsInProgress[tid] == 0) { + // ROB already empty; no need to serialize. + serializeOnNextInst[tid] = false; + } else if (!insts_to_rename.empty()) { + insts_to_rename.front()->setSerializeBefore(); + } + } + + int renamed_insts = 0; + + while (insts_available > 0 && toIEWIndex < renameWidth) { + DPRINTF(Rename, "[tid:%u]: Sending instructions to IEW.\n", tid); + + assert(!insts_to_rename.empty()); + + inst = insts_to_rename.front(); + + insts_to_rename.pop_front(); + + if (renameStatus[tid] == Unblocking) { + DPRINTF(Rename,"[tid:%u]: Removing [sn:%lli] PC:%#x from rename " + "skidBuffer\n", + tid, inst->seqNum, inst->readPC()); + } + + if (inst->isSquashed()) { + DPRINTF(Rename, "[tid:%u]: instruction %i with PC %#x is " + "squashed, skipping.\n", + tid, inst->seqNum, inst->readPC()); + + ++renameSquashedInsts; + + // Decrement how many instructions are available. + --insts_available; + + continue; + } + + DPRINTF(Rename, "[tid:%u]: Processing instruction [sn:%lli] with " + "PC %#x.\n", + tid, inst->seqNum, inst->readPC()); + + // Handle serializeAfter/serializeBefore instructions. + // serializeAfter marks the next instruction as serializeBefore. + // serializeBefore makes the instruction wait in rename until the ROB + // is empty. + + // In this model, IPR accesses are serialize before + // instructions, and store conditionals are serialize after + // instructions. This is mainly due to lack of support for + // out-of-order operations of either of those classes of + // instructions. + if ((inst->isIprAccess() || inst->isSerializeBefore()) && + !inst->isSerializeHandled()) { + DPRINTF(Rename, "Serialize before instruction encountered.\n"); + + if (!inst->isTempSerializeBefore()) { + renamedSerializing++; + inst->setSerializeHandled(); + } else { + renamedTempSerializing++; + } + + // Change status over to SerializeStall so that other stages know + // what this is blocked on. + renameStatus[tid] = SerializeStall; + + serializeInst[tid] = inst; + + blockThisCycle = true; + + break; + } else if ((inst->isStoreConditional() || inst->isSerializeAfter()) && + !inst->isSerializeHandled()) { + DPRINTF(Rename, "Serialize after instruction encountered.\n"); + + renamedSerializing++; + + inst->setSerializeHandled(); + + serializeAfter(insts_to_rename, tid); + } + + // Check here to make sure there are enough destination registers + // to rename to. Otherwise block. + if (renameMap[tid]->numFreeEntries() < inst->numDestRegs()) { + DPRINTF(Rename, "Blocking due to lack of free " + "physical registers to rename to.\n"); + blockThisCycle = true; + + ++renameFullRegistersEvents; + + break; + } + + renameSrcRegs(inst, inst->threadNumber); + + renameDestRegs(inst, inst->threadNumber); + + ++renamed_insts; + + // Put instruction in rename queue. + toIEW->insts[toIEWIndex] = inst; + ++(toIEW->size); + + // Increment which instruction we're on. + ++toIEWIndex; + + // Decrement how many instructions are available. + --insts_available; + } + + instsInProgress[tid] += renamed_insts; + renameRenamedInsts += renamed_insts; + + // If we wrote to the time buffer, record this. + if (toIEWIndex) { + wroteToTimeBuffer = true; + } + + // Check if there's any instructions left that haven't yet been renamed. + // If so then block. + if (insts_available) { + blockThisCycle = true; + } + + if (blockThisCycle) { + block(tid); + toDecode->renameUnblock[tid] = false; + } +} + +template<class Impl> +void +DefaultRename<Impl>::skidInsert(unsigned tid) +{ + DynInstPtr inst = NULL; + + while (!insts[tid].empty()) { + inst = insts[tid].front(); + + insts[tid].pop_front(); + + assert(tid == inst->threadNumber); + + DPRINTF(Rename, "[tid:%u]: Inserting [sn:%lli] PC:%#x into Rename " + "skidBuffer\n", tid, inst->seqNum, inst->readPC()); + + ++renameSkidInsts; + + skidBuffer[tid].push_back(inst); + } + + if (skidBuffer[tid].size() > skidBufferMax) + panic("Skidbuffer Exceeded Max Size"); +} + +template <class Impl> +void +DefaultRename<Impl>::sortInsts() +{ + int insts_from_decode = fromDecode->size; +#ifdef DEBUG +#if !ISA_HAS_DELAY_SLOT + for (int i=0; i < numThreads; i++) + assert(insts[i].empty()); +#endif +#endif + for (int i = 0; i < insts_from_decode; ++i) { + DynInstPtr inst = fromDecode->insts[i]; + insts[inst->threadNumber].push_back(inst); + } +} + +template<class Impl> +bool +DefaultRename<Impl>::skidsEmpty() +{ + std::list<unsigned>::iterator threads = (*activeThreads).begin(); + + while (threads != (*activeThreads).end()) { + if (!skidBuffer[*threads++].empty()) + return false; + } + + return true; +} + +template<class Impl> +void +DefaultRename<Impl>::updateStatus() +{ + bool any_unblocking = false; + + std::list<unsigned>::iterator threads = (*activeThreads).begin(); + + threads = (*activeThreads).begin(); + + while (threads != (*activeThreads).end()) { + unsigned tid = *threads++; + + if (renameStatus[tid] == Unblocking) { + any_unblocking = true; + break; + } + } + + // Rename will have activity if it's unblocking. + if (any_unblocking) { + if (_status == Inactive) { + _status = Active; + + DPRINTF(Activity, "Activating stage.\n"); + + cpu->activateStage(O3CPU::RenameIdx); + } + } else { + // If it's not unblocking, then rename will not have any internal + // activity. Switch it to inactive. + if (_status == Active) { + _status = Inactive; + DPRINTF(Activity, "Deactivating stage.\n"); + + cpu->deactivateStage(O3CPU::RenameIdx); + } + } +} + +template <class Impl> +bool +DefaultRename<Impl>::block(unsigned tid) +{ + DPRINTF(Rename, "[tid:%u]: Blocking.\n", tid); + + // Add the current inputs onto the skid buffer, so they can be + // reprocessed when this stage unblocks. + skidInsert(tid); + + // Only signal backwards to block if the previous stages do not think + // rename is already blocked. + if (renameStatus[tid] != Blocked) { + if (renameStatus[tid] != Unblocking) { + toDecode->renameBlock[tid] = true; + toDecode->renameUnblock[tid] = false; + wroteToTimeBuffer = true; + } + + // Rename can not go from SerializeStall to Blocked, otherwise + // it would not know to complete the serialize stall. + if (renameStatus[tid] != SerializeStall) { + // Set status to Blocked. + renameStatus[tid] = Blocked; + return true; + } + } + + return false; +} + +template <class Impl> +bool +DefaultRename<Impl>::unblock(unsigned tid) +{ + DPRINTF(Rename, "[tid:%u]: Trying to unblock.\n", tid); + + // Rename is done unblocking if the skid buffer is empty. + if (skidBuffer[tid].empty() && renameStatus[tid] != SerializeStall) { + + DPRINTF(Rename, "[tid:%u]: Done unblocking.\n", tid); + + toDecode->renameUnblock[tid] = true; + wroteToTimeBuffer = true; + + renameStatus[tid] = Running; + return true; + } + + return false; +} + +template <class Impl> +void +DefaultRename<Impl>::doSquash(const InstSeqNum &squashed_seq_num, unsigned tid) +{ + typename std::list<RenameHistory>::iterator hb_it = + historyBuffer[tid].begin(); + + // After a syscall squashes everything, the history buffer may be empty + // but the ROB may still be squashing instructions. + if (historyBuffer[tid].empty()) { + return; + } + + // Go through the most recent instructions, undoing the mappings + // they did and freeing up the registers. + while (!historyBuffer[tid].empty() && + (*hb_it).instSeqNum > squashed_seq_num) { + assert(hb_it != historyBuffer[tid].end()); + + DPRINTF(Rename, "[tid:%u]: Removing history entry with sequence " + "number %i.\n", tid, (*hb_it).instSeqNum); + + // Tell the rename map to set the architected register to the + // previous physical register that it was renamed to. + renameMap[tid]->setEntry(hb_it->archReg, hb_it->prevPhysReg); + + // Put the renamed physical register back on the free list. + freeList->addReg(hb_it->newPhysReg); + + // Be sure to mark its register as ready if it's a misc register. + if (hb_it->newPhysReg >= maxPhysicalRegs) { + scoreboard->setReg(hb_it->newPhysReg); + } + + historyBuffer[tid].erase(hb_it++); + + ++renameUndoneMaps; + } +} + +template<class Impl> +void +DefaultRename<Impl>::removeFromHistory(InstSeqNum inst_seq_num, unsigned tid) +{ + DPRINTF(Rename, "[tid:%u]: Removing a committed instruction from the " + "history buffer %u (size=%i), until [sn:%lli].\n", + tid, tid, historyBuffer[tid].size(), inst_seq_num); + + typename std::list<RenameHistory>::iterator hb_it = + historyBuffer[tid].end(); + + --hb_it; + + if (historyBuffer[tid].empty()) { + DPRINTF(Rename, "[tid:%u]: History buffer is empty.\n", tid); + return; + } else if (hb_it->instSeqNum > inst_seq_num) { + DPRINTF(Rename, "[tid:%u]: Old sequence number encountered. Ensure " + "that a syscall happened recently.\n", tid); + return; + } + + // Commit all the renames up until (and including) the committed sequence + // number. Some or even all of the committed instructions may not have + // rename histories if they did not have destination registers that were + // renamed. + while (!historyBuffer[tid].empty() && + hb_it != historyBuffer[tid].end() && + (*hb_it).instSeqNum <= inst_seq_num) { + + DPRINTF(Rename, "[tid:%u]: Freeing up older rename of reg %i, " + "[sn:%lli].\n", + tid, (*hb_it).prevPhysReg, (*hb_it).instSeqNum); + + freeList->addReg((*hb_it).prevPhysReg); + ++renameCommittedMaps; + + historyBuffer[tid].erase(hb_it--); + } +} + +template <class Impl> +inline void +DefaultRename<Impl>::renameSrcRegs(DynInstPtr &inst,unsigned tid) +{ + assert(renameMap[tid] != 0); + + unsigned num_src_regs = inst->numSrcRegs(); + + // Get the architectual register numbers from the source and + // destination operands, and redirect them to the right register. + // Will need to mark dependencies though. + for (int src_idx = 0; src_idx < num_src_regs; src_idx++) { + RegIndex src_reg = inst->srcRegIdx(src_idx); + + // Look up the source registers to get the phys. register they've + // been renamed to, and set the sources to those registers. + PhysRegIndex renamed_reg = renameMap[tid]->lookup(src_reg); + + DPRINTF(Rename, "[tid:%u]: Looking up arch reg %i, got " + "physical reg %i.\n", tid, (int)src_reg, + (int)renamed_reg); + + inst->renameSrcReg(src_idx, renamed_reg); + + // See if the register is ready or not. + if (scoreboard->getReg(renamed_reg) == true) { + DPRINTF(Rename, "[tid:%u]: Register is ready.\n", tid); + + inst->markSrcRegReady(src_idx); + } + + ++renameRenameLookups; + } +} + +template <class Impl> +inline void +DefaultRename<Impl>::renameDestRegs(DynInstPtr &inst,unsigned tid) +{ + typename RenameMap::RenameInfo rename_result; + + unsigned num_dest_regs = inst->numDestRegs(); + + // Rename the destination registers. + for (int dest_idx = 0; dest_idx < num_dest_regs; dest_idx++) { + RegIndex dest_reg = inst->destRegIdx(dest_idx); + + // Get the physical register that the destination will be + // renamed to. + rename_result = renameMap[tid]->rename(dest_reg); + + //Mark Scoreboard entry as not ready + scoreboard->unsetReg(rename_result.first); + + DPRINTF(Rename, "[tid:%u]: Renaming arch reg %i to physical " + "reg %i.\n", tid, (int)dest_reg, + (int)rename_result.first); + + // Record the rename information so that a history can be kept. + RenameHistory hb_entry(inst->seqNum, dest_reg, + rename_result.first, + rename_result.second); + + historyBuffer[tid].push_front(hb_entry); + + DPRINTF(Rename, "[tid:%u]: Adding instruction to history buffer " + "(size=%i), [sn:%lli].\n",tid, + historyBuffer[tid].size(), + (*historyBuffer[tid].begin()).instSeqNum); + + // Tell the instruction to rename the appropriate destination + // register (dest_idx) to the new physical register + // (rename_result.first), and record the previous physical + // register that the same logical register was renamed to + // (rename_result.second). + inst->renameDestReg(dest_idx, + rename_result.first, + rename_result.second); + + ++renameRenamedOperands; + } +} + +template <class Impl> +inline int +DefaultRename<Impl>::calcFreeROBEntries(unsigned tid) +{ + int num_free = freeEntries[tid].robEntries - + (instsInProgress[tid] - fromIEW->iewInfo[tid].dispatched); + + //DPRINTF(Rename,"[tid:%i]: %i rob free\n",tid,num_free); + + return num_free; +} + +template <class Impl> +inline int +DefaultRename<Impl>::calcFreeIQEntries(unsigned tid) +{ + int num_free = freeEntries[tid].iqEntries - + (instsInProgress[tid] - fromIEW->iewInfo[tid].dispatched); + + //DPRINTF(Rename,"[tid:%i]: %i iq free\n",tid,num_free); + + return num_free; +} + +template <class Impl> +inline int +DefaultRename<Impl>::calcFreeLSQEntries(unsigned tid) +{ + int num_free = freeEntries[tid].lsqEntries - + (instsInProgress[tid] - fromIEW->iewInfo[tid].dispatchedToLSQ); + + //DPRINTF(Rename,"[tid:%i]: %i lsq free\n",tid,num_free); + + return num_free; +} + +template <class Impl> +unsigned +DefaultRename<Impl>::validInsts() +{ + unsigned inst_count = 0; + + for (int i=0; i<fromDecode->size; i++) { + if (!fromDecode->insts[i]->isSquashed()) + inst_count++; + } + + return inst_count; +} + +template <class Impl> +void +DefaultRename<Impl>::readStallSignals(unsigned tid) +{ + if (fromIEW->iewBlock[tid]) { + stalls[tid].iew = true; + } + + if (fromIEW->iewUnblock[tid]) { + assert(stalls[tid].iew); + stalls[tid].iew = false; + } + + if (fromCommit->commitBlock[tid]) { + stalls[tid].commit = true; + } + + if (fromCommit->commitUnblock[tid]) { + assert(stalls[tid].commit); + stalls[tid].commit = false; + } +} + +template <class Impl> +bool +DefaultRename<Impl>::checkStall(unsigned tid) +{ + bool ret_val = false; + + if (stalls[tid].iew) { + DPRINTF(Rename,"[tid:%i]: Stall from IEW stage detected.\n", tid); + ret_val = true; + } else if (stalls[tid].commit) { + DPRINTF(Rename,"[tid:%i]: Stall from Commit stage detected.\n", tid); + ret_val = true; + } else if (calcFreeROBEntries(tid) <= 0) { + DPRINTF(Rename,"[tid:%i]: Stall: ROB has 0 free entries.\n", tid); + ret_val = true; + } else if (calcFreeIQEntries(tid) <= 0) { + DPRINTF(Rename,"[tid:%i]: Stall: IQ has 0 free entries.\n", tid); + ret_val = true; + } else if (calcFreeLSQEntries(tid) <= 0) { + DPRINTF(Rename,"[tid:%i]: Stall: LSQ has 0 free entries.\n", tid); + ret_val = true; + } else if (renameMap[tid]->numFreeEntries() <= 0) { + DPRINTF(Rename,"[tid:%i]: Stall: RenameMap has 0 free entries.\n", tid); + ret_val = true; + } else if (renameStatus[tid] == SerializeStall && + (!emptyROB[tid] || instsInProgress[tid])) { + DPRINTF(Rename,"[tid:%i]: Stall: Serialize stall and ROB is not " + "empty.\n", + tid); + ret_val = true; + } + + return ret_val; +} + +template <class Impl> +void +DefaultRename<Impl>::readFreeEntries(unsigned tid) +{ + bool updated = false; + if (fromIEW->iewInfo[tid].usedIQ) { + freeEntries[tid].iqEntries = + fromIEW->iewInfo[tid].freeIQEntries; + updated = true; + } + + if (fromIEW->iewInfo[tid].usedLSQ) { + freeEntries[tid].lsqEntries = + fromIEW->iewInfo[tid].freeLSQEntries; + updated = true; + } + + if (fromCommit->commitInfo[tid].usedROB) { + freeEntries[tid].robEntries = + fromCommit->commitInfo[tid].freeROBEntries; + emptyROB[tid] = fromCommit->commitInfo[tid].emptyROB; + updated = true; + } + + DPRINTF(Rename, "[tid:%i]: Free IQ: %i, Free ROB: %i, Free LSQ: %i\n", + tid, + freeEntries[tid].iqEntries, + freeEntries[tid].robEntries, + freeEntries[tid].lsqEntries); + + DPRINTF(Rename, "[tid:%i]: %i instructions not yet in ROB\n", + tid, instsInProgress[tid]); +} + +template <class Impl> +bool +DefaultRename<Impl>::checkSignalsAndUpdate(unsigned tid) +{ + // Check if there's a squash signal, squash if there is + // Check stall signals, block if necessary. + // If status was blocked + // check if stall conditions have passed + // if so then go to unblocking + // If status was Squashing + // check if squashing is not high. Switch to running this cycle. + // If status was serialize stall + // check if ROB is empty and no insts are in flight to the ROB + + readFreeEntries(tid); + readStallSignals(tid); + + if (fromCommit->commitInfo[tid].squash) { + DPRINTF(Rename, "[tid:%u]: Squashing instructions due to squash from " + "commit.\n", tid); + +#if ISA_HAS_DELAY_SLOT + InstSeqNum squashed_seq_num = fromCommit->commitInfo[tid].bdelayDoneSeqNum; +#else + InstSeqNum squashed_seq_num = fromCommit->commitInfo[tid].doneSeqNum; +#endif + + squash(squashed_seq_num, tid); + + return true; + } + + if (fromCommit->commitInfo[tid].robSquashing) { + DPRINTF(Rename, "[tid:%u]: ROB is still squashing.\n", tid); + + renameStatus[tid] = Squashing; + + return true; + } + + if (checkStall(tid)) { + return block(tid); + } + + if (renameStatus[tid] == Blocked) { + DPRINTF(Rename, "[tid:%u]: Done blocking, switching to unblocking.\n", + tid); + + renameStatus[tid] = Unblocking; + + unblock(tid); + + return true; + } + + if (renameStatus[tid] == Squashing) { + // Switch status to running if rename isn't being told to block or + // squash this cycle. + DPRINTF(Rename, "[tid:%u]: Done squashing, switching to running.\n", + tid); + + renameStatus[tid] = Running; + + return false; + } + + if (renameStatus[tid] == SerializeStall) { + // Stall ends once the ROB is free. + DPRINTF(Rename, "[tid:%u]: Done with serialize stall, switching to " + "unblocking.\n", tid); + + DynInstPtr serial_inst = serializeInst[tid]; + + renameStatus[tid] = Unblocking; + + unblock(tid); + + DPRINTF(Rename, "[tid:%u]: Processing instruction [%lli] with " + "PC %#x.\n", + tid, serial_inst->seqNum, serial_inst->readPC()); + + // Put instruction into queue here. + serial_inst->clearSerializeBefore(); + + if (!skidBuffer[tid].empty()) { + skidBuffer[tid].push_front(serial_inst); + } else { + insts[tid].push_front(serial_inst); + } + + DPRINTF(Rename, "[tid:%u]: Instruction must be processed by rename." + " Adding to front of list.\n", tid); + + serializeInst[tid] = NULL; + + return true; + } + + // If we've reached this point, we have not gotten any signals that + // cause rename to change its status. Rename remains the same as before. + return false; +} + +template<class Impl> +void +DefaultRename<Impl>::serializeAfter(InstQueue &inst_list, + unsigned tid) +{ + if (inst_list.empty()) { + // Mark a bit to say that I must serialize on the next instruction. + serializeOnNextInst[tid] = true; + return; + } + + // Set the next instruction as serializing. + inst_list.front()->setSerializeBefore(); +} + +template <class Impl> +inline void +DefaultRename<Impl>::incrFullStat(const FullSource &source) +{ + switch (source) { + case ROB: + ++renameROBFullEvents; + break; + case IQ: + ++renameIQFullEvents; + break; + case LSQ: + ++renameLSQFullEvents; + break; + default: + panic("Rename full stall stat should be incremented for a reason!"); + break; + } +} + +template <class Impl> +void +DefaultRename<Impl>::dumpHistory() +{ + typename std::list<RenameHistory>::iterator buf_it; + + for (int i = 0; i < numThreads; i++) { + + buf_it = historyBuffer[i].begin(); + + while (buf_it != historyBuffer[i].end()) { + cprintf("Seq num: %i\nArch reg: %i New phys reg: %i Old phys " + "reg: %i\n", (*buf_it).instSeqNum, (int)(*buf_it).archReg, + (int)(*buf_it).newPhysReg, (int)(*buf_it).prevPhysReg); + + buf_it++; + } + } +} diff --git a/src/cpu/o3/rename_map.cc b/src/cpu/o3/rename_map.cc new file mode 100644 index 000000000..befbc3e8a --- /dev/null +++ b/src/cpu/o3/rename_map.cc @@ -0,0 +1,247 @@ +/* + * Copyright (c) 2004-2005 The Regents of The University of Michigan + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are + * met: redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer; + * redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution; + * neither the name of the copyright holders nor the names of its + * contributors may be used to endorse or promote products derived from + * this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + * Authors: Kevin Lim + */ + +#include <vector> + +#include "cpu/o3/rename_map.hh" + +using namespace std; + +// @todo: Consider making inline bool functions that determine if the +// register is a logical int, logical fp, physical int, physical fp, +// etc. + +SimpleRenameMap::~SimpleRenameMap() +{ +} + +void +SimpleRenameMap::init(unsigned _numLogicalIntRegs, + unsigned _numPhysicalIntRegs, + PhysRegIndex &ireg_idx, + + unsigned _numLogicalFloatRegs, + unsigned _numPhysicalFloatRegs, + PhysRegIndex &freg_idx, + + unsigned _numMiscRegs, + + RegIndex _intZeroReg, + RegIndex _floatZeroReg, + + int map_id, + bool bindRegs) +{ + id = map_id; + + numLogicalIntRegs = _numLogicalIntRegs; + + numLogicalFloatRegs = _numLogicalFloatRegs; + + numPhysicalIntRegs = _numPhysicalIntRegs; + + numPhysicalFloatRegs = _numPhysicalFloatRegs; + + numMiscRegs = _numMiscRegs; + + intZeroReg = _intZeroReg; + floatZeroReg = _floatZeroReg; + + DPRINTF(Rename, "Creating rename map %i. Phys: %i / %i, Float: " + "%i / %i.\n", id, numLogicalIntRegs, numPhysicalIntRegs, + numLogicalFloatRegs, numPhysicalFloatRegs); + + numLogicalRegs = numLogicalIntRegs + numLogicalFloatRegs; + + numPhysicalRegs = numPhysicalIntRegs + numPhysicalFloatRegs; + + //Create the rename maps + intRenameMap.resize(numLogicalIntRegs); + floatRenameMap.resize(numLogicalRegs); + + if (bindRegs) { + DPRINTF(Rename, "Binding registers into rename map %i",id); + + // Initialize the entries in the integer rename map to point to the + // physical registers of the same index + for (RegIndex index = 0; index < numLogicalIntRegs; ++index) + { + intRenameMap[index].physical_reg = ireg_idx++; + } + + // Initialize the entries in the floating point rename map to point to + // the physical registers of the same index + // Although the index refers purely to architected registers, because + // the floating reg indices come after the integer reg indices, they + // may exceed the size of a normal RegIndex (short). + for (PhysRegIndex index = numLogicalIntRegs; + index < numLogicalRegs; ++index) + { + floatRenameMap[index].physical_reg = freg_idx++; + } + } else { + DPRINTF(Rename, "Binding registers into rename map %i",id); + + PhysRegIndex temp_ireg = ireg_idx; + + for (RegIndex index = 0; index < numLogicalIntRegs; ++index) + { + intRenameMap[index].physical_reg = temp_ireg++; + } + + PhysRegIndex temp_freg = freg_idx; + + for (PhysRegIndex index = numLogicalIntRegs; + index < numLogicalRegs; ++index) + { + floatRenameMap[index].physical_reg = temp_freg++; + } + } +} + +void +SimpleRenameMap::setFreeList(SimpleFreeList *fl_ptr) +{ + freeList = fl_ptr; +} + + +SimpleRenameMap::RenameInfo +SimpleRenameMap::rename(RegIndex arch_reg) +{ + PhysRegIndex renamed_reg; + PhysRegIndex prev_reg; + + if (arch_reg < numLogicalIntRegs) { + + // Record the current physical register that is renamed to the + // requested architected register. + prev_reg = intRenameMap[arch_reg].physical_reg; + + // If it's not referencing the zero register, then rename the + // register. + if (arch_reg != intZeroReg) { + renamed_reg = freeList->getIntReg(); + + intRenameMap[arch_reg].physical_reg = renamed_reg; + + assert(renamed_reg >= 0 && renamed_reg < numPhysicalIntRegs); + + } else { + // Otherwise return the zero register so nothing bad happens. + renamed_reg = intZeroReg; + } + } else if (arch_reg < numLogicalRegs) { + // Record the current physical register that is renamed to the + // requested architected register. + prev_reg = floatRenameMap[arch_reg].physical_reg; + + // If it's not referencing the zero register, then rename the + // register. + if (arch_reg != floatZeroReg) { + renamed_reg = freeList->getFloatReg(); + + floatRenameMap[arch_reg].physical_reg = renamed_reg; + + assert(renamed_reg < numPhysicalRegs && + renamed_reg >= numPhysicalIntRegs); + } else { + // Otherwise return the zero register so nothing bad happens. + renamed_reg = floatZeroReg; + } + } else { + // Subtract off the base offset for miscellaneous registers. + arch_reg = arch_reg - numLogicalRegs; + + // No renaming happens to the misc. registers. They are + // simply the registers that come after all the physical + // registers; thus take the base architected register and add + // the physical registers to it. + renamed_reg = arch_reg + numPhysicalRegs; + + // Set the previous register to the same register; mainly it must be + // known that the prev reg was outside the range of normal registers + // so the free list can avoid adding it. + prev_reg = renamed_reg; + + assert(renamed_reg < numPhysicalRegs + numMiscRegs); + } + + return RenameInfo(renamed_reg, prev_reg); +} + +PhysRegIndex +SimpleRenameMap::lookup(RegIndex arch_reg) +{ + if (arch_reg < numLogicalIntRegs) { + return intRenameMap[arch_reg].physical_reg; + } else if (arch_reg < numLogicalRegs) { + return floatRenameMap[arch_reg].physical_reg; + } else { + // Subtract off the misc registers offset. + arch_reg = arch_reg - numLogicalRegs; + + // Misc. regs don't rename, so simply add the base arch reg to + // the number of physical registers. + return numPhysicalRegs + arch_reg; + } +} + +void +SimpleRenameMap::setEntry(RegIndex arch_reg, PhysRegIndex renamed_reg) +{ + // In this implementation the miscellaneous registers do not + // actually rename, so this function does not allow you to try to + // change their mappings. + if (arch_reg < numLogicalIntRegs) { + DPRINTF(Rename, "Rename Map: Integer register %i being set to %i.\n", + (int)arch_reg, renamed_reg); + + intRenameMap[arch_reg].physical_reg = renamed_reg; + } else if (arch_reg < numLogicalIntRegs + numLogicalFloatRegs) { + DPRINTF(Rename, "Rename Map: Float register %i being set to %i.\n", + (int)arch_reg - numLogicalIntRegs, renamed_reg); + + floatRenameMap[arch_reg].physical_reg = renamed_reg; + } +} + +int +SimpleRenameMap::numFreeEntries() +{ + int free_int_regs = freeList->numFreeIntRegs(); + int free_float_regs = freeList->numFreeFloatRegs(); + + if (free_int_regs < free_float_regs) { + return free_int_regs; + } else { + return free_float_regs; + } +} diff --git a/src/cpu/o3/rename_map.hh b/src/cpu/o3/rename_map.hh new file mode 100644 index 000000000..896c66f3e --- /dev/null +++ b/src/cpu/o3/rename_map.hh @@ -0,0 +1,167 @@ +/* + * Copyright (c) 2004-2005 The Regents of The University of Michigan + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are + * met: redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer; + * redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution; + * neither the name of the copyright holders nor the names of its + * contributors may be used to endorse or promote products derived from + * this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + * Authors: Kevin Lim + */ + +// Todo: Create destructor. +// Have it so that there's a more meaningful name given to the variable +// that marks the beginning of the FP registers. + +#ifndef __CPU_O3_RENAME_MAP_HH__ +#define __CPU_O3_RENAME_MAP_HH__ + +#include <iostream> +#include <utility> +#include <vector> + +#include "cpu/o3/free_list.hh" +#include "arch/types.hh" + +class SimpleRenameMap +{ + protected: + typedef TheISA::RegIndex RegIndex; + public: + /** + * Pair of a logical register and a physical register. Tells the + * previous mapping of a logical register to a physical register. + * Used to roll back the rename map to a previous state. + */ + typedef std::pair<RegIndex, PhysRegIndex> UnmapInfo; + + /** + * Pair of a physical register and a physical register. Used to + * return the physical register that a logical register has been + * renamed to, and the previous physical register that the same + * logical register was previously mapped to. + */ + typedef std::pair<PhysRegIndex, PhysRegIndex> RenameInfo; + + public: + /** Default constructor. init() must be called prior to use. */ + SimpleRenameMap() {}; + + /** Destructor. */ + ~SimpleRenameMap(); + + /** Initializes rename map with given parameters. */ + void init(unsigned _numLogicalIntRegs, + unsigned _numPhysicalIntRegs, + PhysRegIndex &_int_reg_start, + + unsigned _numLogicalFloatRegs, + unsigned _numPhysicalFloatRegs, + PhysRegIndex &_float_reg_start, + + unsigned _numMiscRegs, + + RegIndex _intZeroReg, + RegIndex _floatZeroReg, + + int id, + bool bindRegs); + + /** Sets the free list used with this rename map. */ + void setFreeList(SimpleFreeList *fl_ptr); + + //Tell rename map to get a free physical register for a given + //architected register. Not sure it should have a return value, + //but perhaps it should have some sort of fault in case there are + //no free registers. + RenameInfo rename(RegIndex arch_reg); + + PhysRegIndex lookup(RegIndex phys_reg); + + /** + * Marks the given register as ready, meaning that its value has been + * calculated and written to the register file. + * @param ready_reg The index of the physical register that is now ready. + */ + void setEntry(RegIndex arch_reg, PhysRegIndex renamed_reg); + + int numFreeEntries(); + + private: + /** Rename Map ID */ + int id; + + /** Number of logical integer registers. */ + int numLogicalIntRegs; + + /** Number of physical integer registers. */ + int numPhysicalIntRegs; + + /** Number of logical floating point registers. */ + int numLogicalFloatRegs; + + /** Number of physical floating point registers. */ + int numPhysicalFloatRegs; + + /** Number of miscellaneous registers. */ + int numMiscRegs; + + /** Number of logical integer + float registers. */ + int numLogicalRegs; + + /** Number of physical integer + float registers. */ + int numPhysicalRegs; + + /** The integer zero register. This implementation assumes it is always + * zero and never can be anything else. + */ + RegIndex intZeroReg; + + /** The floating point zero register. This implementation assumes it is + * always zero and never can be anything else. + */ + RegIndex floatZeroReg; + + class RenameEntry + { + public: + PhysRegIndex physical_reg; + bool valid; + + RenameEntry() + : physical_reg(0), valid(false) + { } + }; + + private: + /** Integer rename map. */ + std::vector<RenameEntry> intRenameMap; + + /** Floating point rename map. */ + std::vector<RenameEntry> floatRenameMap; + + private: + /** Free list interface. */ + SimpleFreeList *freeList; +}; + +#endif //__CPU_O3_RENAME_MAP_HH__ diff --git a/src/cpu/o3/rob.cc b/src/cpu/o3/rob.cc new file mode 100644 index 000000000..9976049cd --- /dev/null +++ b/src/cpu/o3/rob.cc @@ -0,0 +1,36 @@ +/* + * Copyright (c) 2004-2005 The Regents of The University of Michigan + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are + * met: redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer; + * redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution; + * neither the name of the copyright holders nor the names of its + * contributors may be used to endorse or promote products derived from + * this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + * Authors: Kevin Lim + * Nathan Binkert + */ + +#include "cpu/o3/isa_specific.hh" +#include "cpu/o3/rob_impl.hh" + +// Force instantiation of InstructionQueue. +template class ROB<O3CPUImpl>; diff --git a/src/cpu/o3/rob.hh b/src/cpu/o3/rob.hh new file mode 100644 index 000000000..7cd5a5143 --- /dev/null +++ b/src/cpu/o3/rob.hh @@ -0,0 +1,320 @@ +/* + * Copyright (c) 2004-2006 The Regents of The University of Michigan + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are + * met: redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer; + * redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution; + * neither the name of the copyright holders nor the names of its + * contributors may be used to endorse or promote products derived from + * this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + * Authors: Kevin Lim + * Korey Sewell + */ + +#ifndef __CPU_O3_ROB_HH__ +#define __CPU_O3_ROB_HH__ + +#include <string> +#include <utility> +#include <vector> + +/** + * ROB class. The ROB is largely what drives squashing. + */ +template <class Impl> +class ROB +{ + protected: + typedef TheISA::RegIndex RegIndex; + public: + //Typedefs from the Impl. + typedef typename Impl::O3CPU O3CPU; + typedef typename Impl::DynInstPtr DynInstPtr; + + typedef std::pair<RegIndex, PhysRegIndex> UnmapInfo; + typedef typename std::list<DynInstPtr>::iterator InstIt; + + /** Possible ROB statuses. */ + enum Status { + Running, + Idle, + ROBSquashing + }; + + /** SMT ROB Sharing Policy */ + enum ROBPolicy{ + Dynamic, + Partitioned, + Threshold + }; + + private: + /** Per-thread ROB status. */ + Status robStatus[Impl::MaxThreads]; + + /** ROB resource sharing policy for SMT mode. */ + ROBPolicy robPolicy; + + public: + /** ROB constructor. + * @param _numEntries Number of entries in ROB. + * @param _squashWidth Number of instructions that can be squashed in a + * single cycle. + * @param _smtROBPolicy ROB Partitioning Scheme for SMT. + * @param _smtROBThreshold Max Resources(by %) a thread can have in the ROB. + * @param _numThreads The number of active threads. + */ + ROB(unsigned _numEntries, unsigned _squashWidth, std::string smtROBPolicy, + unsigned _smtROBThreshold, unsigned _numThreads); + + std::string name() const; + + /** Function to set the CPU pointer, necessary due to which object the ROB + * is created within. + * @param cpu_ptr Pointer to the implementation specific full CPU object. + */ + void setCPU(O3CPU *cpu_ptr); + + /** Sets pointer to the list of active threads. + * @param at_ptr Pointer to the list of active threads. + */ + void setActiveThreads(std::list<unsigned>* at_ptr); + + /** Switches out the ROB. */ + void switchOut(); + + /** Takes over another CPU's thread. */ + void takeOverFrom(); + + /** Function to insert an instruction into the ROB. Note that whatever + * calls this function must ensure that there is enough space within the + * ROB for the new instruction. + * @param inst The instruction being inserted into the ROB. + */ + void insertInst(DynInstPtr &inst); + + /** Returns pointer to the head instruction within the ROB. There is + * no guarantee as to the return value if the ROB is empty. + * @retval Pointer to the DynInst that is at the head of the ROB. + */ +// DynInstPtr readHeadInst(); + + /** Returns a pointer to the head instruction of a specific thread within + * the ROB. + * @return Pointer to the DynInst that is at the head of the ROB. + */ + DynInstPtr readHeadInst(unsigned tid); + + /** Returns pointer to the tail instruction within the ROB. There is + * no guarantee as to the return value if the ROB is empty. + * @retval Pointer to the DynInst that is at the tail of the ROB. + */ +// DynInstPtr readTailInst(); + + /** Returns a pointer to the tail instruction of a specific thread within + * the ROB. + * @return Pointer to the DynInst that is at the tail of the ROB. + */ + DynInstPtr readTailInst(unsigned tid); + + /** Retires the head instruction, removing it from the ROB. */ +// void retireHead(); + + /** Retires the head instruction of a specific thread, removing it from the + * ROB. + */ + void retireHead(unsigned tid); + + /** Is the oldest instruction across all threads ready. */ +// bool isHeadReady(); + + /** Is the oldest instruction across a particular thread ready. */ + bool isHeadReady(unsigned tid); + + /** Is there any commitable head instruction across all threads ready. */ + bool canCommit(); + + /** Re-adjust ROB partitioning. */ + void resetEntries(); + + /** Number of entries needed For 'num_threads' amount of threads. */ + int entryAmount(int num_threads); + + /** Returns the number of total free entries in the ROB. */ + unsigned numFreeEntries(); + + /** Returns the number of free entries in a specific ROB paritition. */ + unsigned numFreeEntries(unsigned tid); + + /** Returns the maximum number of entries for a specific thread. */ + unsigned getMaxEntries(unsigned tid) + { return maxEntries[tid]; } + + /** Returns the number of entries being used by a specific thread. */ + unsigned getThreadEntries(unsigned tid) + { return threadEntries[tid]; } + + /** Returns if the ROB is full. */ + bool isFull() + { return numInstsInROB == numEntries; } + + /** Returns if a specific thread's partition is full. */ + bool isFull(unsigned tid) + { return threadEntries[tid] == numEntries; } + + /** Returns if the ROB is empty. */ + bool isEmpty() + { return numInstsInROB == 0; } + + /** Returns if a specific thread's partition is empty. */ + bool isEmpty(unsigned tid) + { return threadEntries[tid] == 0; } + + /** Executes the squash, marking squashed instructions. */ + void doSquash(unsigned tid); + + /** Squashes all instructions younger than the given sequence number for + * the specific thread. + */ + void squash(InstSeqNum squash_num, unsigned tid); + + /** Updates the head instruction with the new oldest instruction. */ + void updateHead(); + + /** Updates the tail instruction with the new youngest instruction. */ + void updateTail(); + + /** Reads the PC of the oldest head instruction. */ +// uint64_t readHeadPC(); + + /** Reads the PC of the head instruction of a specific thread. */ +// uint64_t readHeadPC(unsigned tid); + + /** Reads the next PC of the oldest head instruction. */ +// uint64_t readHeadNextPC(); + + /** Reads the next PC of the head instruction of a specific thread. */ +// uint64_t readHeadNextPC(unsigned tid); + + /** Reads the sequence number of the oldest head instruction. */ +// InstSeqNum readHeadSeqNum(); + + /** Reads the sequence number of the head instruction of a specific thread. + */ +// InstSeqNum readHeadSeqNum(unsigned tid); + + /** Reads the PC of the youngest tail instruction. */ +// uint64_t readTailPC(); + + /** Reads the PC of the tail instruction of a specific thread. */ +// uint64_t readTailPC(unsigned tid); + + /** Reads the sequence number of the youngest tail instruction. */ +// InstSeqNum readTailSeqNum(); + + /** Reads the sequence number of tail instruction of a specific thread. */ +// InstSeqNum readTailSeqNum(unsigned tid); + + /** Checks if the ROB is still in the process of squashing instructions. + * @retval Whether or not the ROB is done squashing. + */ + bool isDoneSquashing(unsigned tid) const + { return doneSquashing[tid]; } + + /** Checks if the ROB is still in the process of squashing instructions for + * any thread. + */ + bool isDoneSquashing(); + + /** This is more of a debugging function than anything. Use + * numInstsInROB to get the instructions in the ROB unless you are + * double checking that variable. + */ + int countInsts(); + + /** This is more of a debugging function than anything. Use + * threadEntries to get the instructions in the ROB unless you are + * double checking that variable. + */ + int countInsts(unsigned tid); + + private: + /** Pointer to the CPU. */ + O3CPU *cpu; + + /** Active Threads in CPU */ + std::list<unsigned>* activeThreads; + + /** Number of instructions in the ROB. */ + unsigned numEntries; + + /** Entries Per Thread */ + unsigned threadEntries[Impl::MaxThreads]; + + /** Max Insts a Thread Can Have in the ROB */ + unsigned maxEntries[Impl::MaxThreads]; + + /** ROB List of Instructions */ + std::list<DynInstPtr> instList[Impl::MaxThreads]; + + /** Number of instructions that can be squashed in a single cycle. */ + unsigned squashWidth; + + public: + /** Iterator pointing to the instruction which is the last instruction + * in the ROB. This may at times be invalid (ie when the ROB is empty), + * however it should never be incorrect. + */ + InstIt tail; + + /** Iterator pointing to the instruction which is the first instruction in + * in the ROB*/ + InstIt head; + + private: + /** Iterator used for walking through the list of instructions when + * squashing. Used so that there is persistent state between cycles; + * when squashing, the instructions are marked as squashed but not + * immediately removed, meaning the tail iterator remains the same before + * and after a squash. + * This will always be set to cpu->instList.end() if it is invalid. + */ + InstIt squashIt[Impl::MaxThreads]; + + public: + /** Number of instructions in the ROB. */ + int numInstsInROB; + + /** Dummy instruction returned if there are no insts left. */ + DynInstPtr dummyInst; + + private: + /** The sequence number of the squashed instruction. */ + InstSeqNum squashedSeqNum[Impl::MaxThreads]; + + /** Is the ROB done squashing. */ + bool doneSquashing[Impl::MaxThreads]; + + /** Number of active threads. */ + unsigned numThreads; +}; + +#endif //__CPU_O3_ROB_HH__ diff --git a/src/cpu/o3/rob_impl.hh b/src/cpu/o3/rob_impl.hh new file mode 100644 index 000000000..fab114a74 --- /dev/null +++ b/src/cpu/o3/rob_impl.hh @@ -0,0 +1,696 @@ +/* + * Copyright (c) 2004-2006 The Regents of The University of Michigan + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are + * met: redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer; + * redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution; + * neither the name of the copyright holders nor the names of its + * contributors may be used to endorse or promote products derived from + * this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + * Authors: Kevin Lim + * Korey Sewell + */ + +#include "config/full_system.hh" +#include "cpu/o3/rob.hh" + +#include <list> + +template <class Impl> +ROB<Impl>::ROB(unsigned _numEntries, unsigned _squashWidth, + std::string _smtROBPolicy, unsigned _smtROBThreshold, + unsigned _numThreads) + : numEntries(_numEntries), + squashWidth(_squashWidth), + numInstsInROB(0), + numThreads(_numThreads) +{ + for (int tid=0; tid < numThreads; tid++) { + squashedSeqNum[tid] = 0; + doneSquashing[tid] = true; + threadEntries[tid] = 0; + } + + std::string policy = _smtROBPolicy; + + //Convert string to lowercase + std::transform(policy.begin(), policy.end(), policy.begin(), + (int(*)(int)) tolower); + + //Figure out rob policy + if (policy == "dynamic") { + robPolicy = Dynamic; + + //Set Max Entries to Total ROB Capacity + for (int i = 0; i < numThreads; i++) { + maxEntries[i]=numEntries; + } + + } else if (policy == "partitioned") { + robPolicy = Partitioned; + DPRINTF(Fetch, "ROB sharing policy set to Partitioned\n"); + + //@todo:make work if part_amt doesnt divide evenly. + int part_amt = numEntries / numThreads; + + //Divide ROB up evenly + for (int i = 0; i < numThreads; i++) { + maxEntries[i]=part_amt; + } + + } else if (policy == "threshold") { + robPolicy = Threshold; + DPRINTF(Fetch, "ROB sharing policy set to Threshold\n"); + + int threshold = _smtROBThreshold;; + + //Divide up by threshold amount + for (int i = 0; i < numThreads; i++) { + maxEntries[i]=threshold; + } + } else { + assert(0 && "Invalid ROB Sharing Policy.Options Are:{Dynamic," + "Partitioned, Threshold}"); + } +} + +template <class Impl> +std::string +ROB<Impl>::name() const +{ + return cpu->name() + ".rob"; +} + +template <class Impl> +void +ROB<Impl>::setCPU(O3CPU *cpu_ptr) +{ + cpu = cpu_ptr; + + // Set the per-thread iterators to the end of the instruction list. + for (int i=0; i < numThreads;i++) { + squashIt[i] = instList[i].end(); + } + + // Initialize the "universal" ROB head & tail point to invalid + // pointers + head = instList[0].end(); + tail = instList[0].end(); +} + +template <class Impl> +void +ROB<Impl>::setActiveThreads(std::list<unsigned> *at_ptr) +{ + DPRINTF(ROB, "Setting active threads list pointer.\n"); + activeThreads = at_ptr; +} + +template <class Impl> +void +ROB<Impl>::switchOut() +{ + for (int tid = 0; tid < numThreads; tid++) { + instList[tid].clear(); + } +} + +template <class Impl> +void +ROB<Impl>::takeOverFrom() +{ + for (int tid=0; tid < numThreads; tid++) { + doneSquashing[tid] = true; + threadEntries[tid] = 0; + squashIt[tid] = instList[tid].end(); + } + numInstsInROB = 0; + + // Initialize the "universal" ROB head & tail point to invalid + // pointers + head = instList[0].end(); + tail = instList[0].end(); +} + +template <class Impl> +void +ROB<Impl>::resetEntries() +{ + if (robPolicy != Dynamic || numThreads > 1) { + int active_threads = (*activeThreads).size(); + + std::list<unsigned>::iterator threads = (*activeThreads).begin(); + std::list<unsigned>::iterator list_end = (*activeThreads).end(); + + while (threads != list_end) { + if (robPolicy == Partitioned) { + maxEntries[*threads++] = numEntries / active_threads; + } else if (robPolicy == Threshold && active_threads == 1) { + maxEntries[*threads++] = numEntries; + } + } + } +} + +template <class Impl> +int +ROB<Impl>::entryAmount(int num_threads) +{ + if (robPolicy == Partitioned) { + return numEntries / num_threads; + } else { + return 0; + } +} + +template <class Impl> +int +ROB<Impl>::countInsts() +{ + int total=0; + + for (int i=0;i < numThreads;i++) + total += countInsts(i); + + return total; +} + +template <class Impl> +int +ROB<Impl>::countInsts(unsigned tid) +{ + return instList[tid].size(); +} + +template <class Impl> +void +ROB<Impl>::insertInst(DynInstPtr &inst) +{ + //assert(numInstsInROB == countInsts()); + assert(inst); + + DPRINTF(ROB, "Adding inst PC %#x to the ROB.\n", inst->readPC()); + + assert(numInstsInROB != numEntries); + + int tid = inst->threadNumber; + + instList[tid].push_back(inst); + + //Set Up head iterator if this is the 1st instruction in the ROB + if (numInstsInROB == 0) { + head = instList[tid].begin(); + assert((*head) == inst); + } + + //Must Decrement for iterator to actually be valid since __.end() + //actually points to 1 after the last inst + tail = instList[tid].end(); + tail--; + + inst->setInROB(); + + ++numInstsInROB; + ++threadEntries[tid]; + + assert((*tail) == inst); + + DPRINTF(ROB, "[tid:%i] Now has %d instructions.\n", tid, threadEntries[tid]); +} + +// Whatever calls this function needs to ensure that it properly frees up +// registers prior to this function. +/* +template <class Impl> +void +ROB<Impl>::retireHead() +{ + //assert(numInstsInROB == countInsts()); + assert(numInstsInROB > 0); + + int tid = (*head)->threadNumber; + + retireHead(tid); + + if (numInstsInROB == 0) { + tail = instList[tid].end(); + } +} +*/ + +template <class Impl> +void +ROB<Impl>::retireHead(unsigned tid) +{ + //assert(numInstsInROB == countInsts()); + assert(numInstsInROB > 0); + + // Get the head ROB instruction. + InstIt head_it = instList[tid].begin(); + + DynInstPtr head_inst = (*head_it); + + assert(head_inst->readyToCommit()); + + DPRINTF(ROB, "[tid:%u]: Retiring head instruction, " + "instruction PC %#x,[sn:%lli]\n", tid, head_inst->readPC(), + head_inst->seqNum); + + --numInstsInROB; + --threadEntries[tid]; + + head_inst->clearInROB(); + head_inst->setCommitted(); + + instList[tid].erase(head_it); + + //Update "Global" Head of ROB + updateHead(); + + // @todo: A special case is needed if the instruction being + // retired is the only instruction in the ROB; otherwise the tail + // iterator will become invalidated. + cpu->removeFrontInst(head_inst); +} +/* +template <class Impl> +bool +ROB<Impl>::isHeadReady() +{ + if (numInstsInROB != 0) { + return (*head)->readyToCommit(); + } + + return false; +} +*/ +template <class Impl> +bool +ROB<Impl>::isHeadReady(unsigned tid) +{ + if (threadEntries[tid] != 0) { + return instList[tid].front()->readyToCommit(); + } + + return false; +} + +template <class Impl> +bool +ROB<Impl>::canCommit() +{ + //@todo: set ActiveThreads through ROB or CPU + std::list<unsigned>::iterator threads = (*activeThreads).begin(); + + while (threads != (*activeThreads).end()) { + unsigned tid = *threads++; + + if (isHeadReady(tid)) { + return true; + } + } + + return false; +} + +template <class Impl> +unsigned +ROB<Impl>::numFreeEntries() +{ + //assert(numInstsInROB == countInsts()); + + return numEntries - numInstsInROB; +} + +template <class Impl> +unsigned +ROB<Impl>::numFreeEntries(unsigned tid) +{ + return maxEntries[tid] - threadEntries[tid]; +} + +template <class Impl> +void +ROB<Impl>::doSquash(unsigned tid) +{ + DPRINTF(ROB, "[tid:%u]: Squashing instructions until [sn:%i].\n", + tid, squashedSeqNum[tid]); + + assert(squashIt[tid] != instList[tid].end()); + + if ((*squashIt[tid])->seqNum < squashedSeqNum[tid]) { + DPRINTF(ROB, "[tid:%u]: Done squashing instructions.\n", + tid); + + squashIt[tid] = instList[tid].end(); + + doneSquashing[tid] = true; + return; + } + + bool robTailUpdate = false; + + for (int numSquashed = 0; + numSquashed < squashWidth && + squashIt[tid] != instList[tid].end() && + (*squashIt[tid])->seqNum > squashedSeqNum[tid]; + ++numSquashed) + { + DPRINTF(ROB, "[tid:%u]: Squashing instruction PC %#x, seq num %i.\n", + (*squashIt[tid])->threadNumber, + (*squashIt[tid])->readPC(), + (*squashIt[tid])->seqNum); + + // Mark the instruction as squashed, and ready to commit so that + // it can drain out of the pipeline. + (*squashIt[tid])->setSquashed(); + + (*squashIt[tid])->setCanCommit(); + + + if (squashIt[tid] == instList[tid].begin()) { + DPRINTF(ROB, "Reached head of instruction list while " + "squashing.\n"); + + squashIt[tid] = instList[tid].end(); + + doneSquashing[tid] = true; + + return; + } + + InstIt tail_thread = instList[tid].end(); + tail_thread--; + + if ((*squashIt[tid]) == (*tail_thread)) + robTailUpdate = true; + + squashIt[tid]--; + } + + + // Check if ROB is done squashing. + if ((*squashIt[tid])->seqNum <= squashedSeqNum[tid]) { + DPRINTF(ROB, "[tid:%u]: Done squashing instructions.\n", + tid); + + squashIt[tid] = instList[tid].end(); + + doneSquashing[tid] = true; + } + + if (robTailUpdate) { + updateTail(); + } +} + + +template <class Impl> +void +ROB<Impl>::updateHead() +{ + DynInstPtr head_inst; + InstSeqNum lowest_num = 0; + bool first_valid = true; + + // @todo: set ActiveThreads through ROB or CPU + std::list<unsigned>::iterator threads = (*activeThreads).begin(); + + while (threads != (*activeThreads).end()) { + unsigned thread_num = *threads++; + + if (instList[thread_num].empty()) + continue; + + if (first_valid) { + head = instList[thread_num].begin(); + lowest_num = (*head)->seqNum; + first_valid = false; + continue; + } + + InstIt head_thread = instList[thread_num].begin(); + + DynInstPtr head_inst = (*head_thread); + + assert(head_inst != 0); + + if (head_inst->seqNum < lowest_num) { + head = head_thread; + lowest_num = head_inst->seqNum; + } + } + + if (first_valid) { + head = instList[0].end(); + } + +} + +template <class Impl> +void +ROB<Impl>::updateTail() +{ + tail = instList[0].end(); + bool first_valid = true; + + std::list<unsigned>::iterator threads = (*activeThreads).begin(); + + while (threads != (*activeThreads).end()) { + unsigned tid = *threads++; + + if (instList[tid].empty()) { + continue; + } + + // If this is the first valid then assign w/out + // comparison + if (first_valid) { + tail = instList[tid].end(); + tail--; + first_valid = false; + continue; + } + + // Assign new tail if this thread's tail is younger + // than our current "tail high" + InstIt tail_thread = instList[tid].end(); + tail_thread--; + + if ((*tail_thread)->seqNum > (*tail)->seqNum) { + tail = tail_thread; + } + } +} + + +template <class Impl> +void +ROB<Impl>::squash(InstSeqNum squash_num,unsigned tid) +{ + if (isEmpty()) { + DPRINTF(ROB, "Does not need to squash due to being empty " + "[sn:%i]\n", + squash_num); + + return; + } + + DPRINTF(ROB, "Starting to squash within the ROB.\n"); + + robStatus[tid] = ROBSquashing; + + doneSquashing[tid] = false; + + squashedSeqNum[tid] = squash_num; + + if (!instList[tid].empty()) { + InstIt tail_thread = instList[tid].end(); + tail_thread--; + + squashIt[tid] = tail_thread; + + doSquash(tid); + } +} +/* +template <class Impl> +typename Impl::DynInstPtr +ROB<Impl>::readHeadInst() +{ + if (numInstsInROB != 0) { + assert((*head)->isInROB()==true); + return *head; + } else { + return dummyInst; + } +} +*/ + +template <class Impl> +typename Impl::DynInstPtr +ROB<Impl>::readHeadInst(unsigned tid) +{ + if (threadEntries[tid] != 0) { + InstIt head_thread = instList[tid].begin(); + + assert((*head_thread)->isInROB()==true); + + return *head_thread; + } else { + return dummyInst; + } +} + +/* +template <class Impl> +uint64_t +ROB<Impl>::readHeadPC() +{ + //assert(numInstsInROB == countInsts()); + + DynInstPtr head_inst = *head; + + return head_inst->readPC(); +} + +template <class Impl> +uint64_t +ROB<Impl>::readHeadPC(unsigned tid) +{ + //assert(numInstsInROB == countInsts()); + InstIt head_thread = instList[tid].begin(); + + return (*head_thread)->readPC(); +} + + +template <class Impl> +uint64_t +ROB<Impl>::readHeadNextPC() +{ + //assert(numInstsInROB == countInsts()); + + DynInstPtr head_inst = *head; + + return head_inst->readNextPC(); +} + +template <class Impl> +uint64_t +ROB<Impl>::readHeadNextPC(unsigned tid) +{ + //assert(numInstsInROB == countInsts()); + InstIt head_thread = instList[tid].begin(); + + return (*head_thread)->readNextPC(); +} + +template <class Impl> +InstSeqNum +ROB<Impl>::readHeadSeqNum() +{ + //assert(numInstsInROB == countInsts()); + DynInstPtr head_inst = *head; + + return head_inst->seqNum; +} + +template <class Impl> +InstSeqNum +ROB<Impl>::readHeadSeqNum(unsigned tid) +{ + InstIt head_thread = instList[tid].begin(); + + return ((*head_thread)->seqNum); +} + +template <class Impl> +typename Impl::DynInstPtr +ROB<Impl>::readTailInst() +{ + //assert(numInstsInROB == countInsts()); + //assert(tail != instList[0].end()); + + return (*tail); +} +*/ +template <class Impl> +typename Impl::DynInstPtr +ROB<Impl>::readTailInst(unsigned tid) +{ + //assert(tail_thread[tid] != instList[tid].end()); + + InstIt tail_thread = instList[tid].end(); + tail_thread--; + + return *tail_thread; +} + +/* +template <class Impl> +uint64_t +ROB<Impl>::readTailPC() +{ + //assert(numInstsInROB == countInsts()); + + //assert(tail != instList[0].end()); + + return (*tail)->readPC(); +} + +template <class Impl> +uint64_t +ROB<Impl>::readTailPC(unsigned tid) +{ + //assert(tail_thread[tid] != instList[tid].end()); + + InstIt tail_thread = instList[tid].end(); + tail_thread--; + + return (*tail_thread)->readPC(); +} + +template <class Impl> +InstSeqNum +ROB<Impl>::readTailSeqNum() +{ + // Return the last sequence number that has not been squashed. Other + // stages can use it to squash any instructions younger than the current + // tail. + return (*tail)->seqNum; +} + +template <class Impl> +InstSeqNum +ROB<Impl>::readTailSeqNum(unsigned tid) +{ + // Return the last sequence number that has not been squashed. Other + // stages can use it to squash any instructions younger than the current + // tail. + // assert(tail_thread[tid] != instList[tid].end()); + + InstIt tail_thread = instList[tid].end(); + tail_thread--; + + return (*tail_thread)->seqNum; +} +*/ diff --git a/src/cpu/o3/sat_counter.cc b/src/cpu/o3/sat_counter.cc new file mode 100644 index 000000000..68d3ef627 --- /dev/null +++ b/src/cpu/o3/sat_counter.cc @@ -0,0 +1,57 @@ +/* + * Copyright (c) 2005 The Regents of The University of Michigan + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are + * met: redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer; + * redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution; + * neither the name of the copyright holders nor the names of its + * contributors may be used to endorse or promote products derived from + * this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + * Authors: Kevin Lim + */ + +#include "base/misc.hh" +#include "cpu/o3/sat_counter.hh" + +SatCounter::SatCounter() + : initialVal(0), counter(0) +{ +} + +SatCounter::SatCounter(unsigned bits) + : initialVal(0), maxVal((1 << bits) - 1), counter(0) +{ +} + +SatCounter::SatCounter(unsigned bits, uint8_t initial_val) + : initialVal(initialVal), maxVal((1 << bits) - 1), counter(initial_val) +{ + // Check to make sure initial value doesn't exceed the max counter value. + if (initial_val > maxVal) { + fatal("BP: Initial counter value exceeds max size."); + } +} + +void +SatCounter::setBits(unsigned bits) +{ + maxVal = (1 << bits) - 1; +} diff --git a/src/cpu/o3/sat_counter.hh b/src/cpu/o3/sat_counter.hh new file mode 100644 index 000000000..7e15119b0 --- /dev/null +++ b/src/cpu/o3/sat_counter.hh @@ -0,0 +1,116 @@ +/* + * Copyright (c) 2005-2006 The Regents of The University of Michigan + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are + * met: redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer; + * redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution; + * neither the name of the copyright holders nor the names of its + * contributors may be used to endorse or promote products derived from + * this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + * Authors: Kevin Lim + */ + +#ifndef __CPU_O3_SAT_COUNTER_HH__ +#define __CPU_O3_SAT_COUNTER_HH__ + +#include "base/misc.hh" +#include "sim/host.hh" + +/** + * Private counter class for the internal saturating counters. + * Implements an n bit saturating counter and provides methods to + * increment, decrement, and read it. + * @todo Consider making this something that more closely mimics a + * built in class so you can use ++ or --. + */ +class SatCounter +{ + public: + /** + * Constructor for the counter. + */ + SatCounter() + : initialVal(0), counter(0) + { } + + /** + * Constructor for the counter. + * @param bits How many bits the counter will have. + */ + SatCounter(unsigned bits) + : initialVal(0), maxVal((1 << bits) - 1), counter(0) + { } + + /** + * Constructor for the counter. + * @param bits How many bits the counter will have. + * @param initial_val Starting value for each counter. + */ + SatCounter(unsigned bits, uint8_t initial_val) + : initialVal(initialVal), maxVal((1 << bits) - 1), counter(initial_val) + { + // Check to make sure initial value doesn't exceed the max + // counter value. + if (initial_val > maxVal) { + fatal("BP: Initial counter value exceeds max size."); + } + } + + /** + * Sets the number of bits. + */ + void setBits(unsigned bits) { maxVal = (1 << bits) - 1; } + + void reset() { counter = initialVal; } + + /** + * Increments the counter's current value. + */ + void increment() + { + if (counter < maxVal) { + ++counter; + } + } + + /** + * Decrements the counter's current value. + */ + void decrement() + { + if (counter > 0) { + --counter; + } + } + + /** + * Read the counter's value. + */ + const uint8_t read() const + { return counter; } + + private: + uint8_t initialVal; + uint8_t maxVal; + uint8_t counter; +}; + +#endif // __CPU_O3_SAT_COUNTER_HH__ diff --git a/src/cpu/o3/scoreboard.cc b/src/cpu/o3/scoreboard.cc new file mode 100644 index 000000000..1859b35a4 --- /dev/null +++ b/src/cpu/o3/scoreboard.cc @@ -0,0 +1,109 @@ +/* + * Copyright (c) 2005-2006 The Regents of The University of Michigan + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are + * met: redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer; + * redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution; + * neither the name of the copyright holders nor the names of its + * contributors may be used to endorse or promote products derived from + * this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + * Authors: Korey Sewell + * Kevin Lim + */ + +#include "cpu/o3/scoreboard.hh" + +Scoreboard::Scoreboard(unsigned activeThreads, + unsigned _numLogicalIntRegs, + unsigned _numPhysicalIntRegs, + unsigned _numLogicalFloatRegs, + unsigned _numPhysicalFloatRegs, + unsigned _numMiscRegs, + unsigned _zeroRegIdx) + : numLogicalIntRegs(_numLogicalIntRegs), + numPhysicalIntRegs(_numPhysicalIntRegs), + numLogicalFloatRegs(_numLogicalFloatRegs), + numPhysicalFloatRegs(_numPhysicalFloatRegs), + numMiscRegs(_numMiscRegs), + zeroRegIdx(_zeroRegIdx) +{ + //Get Register Sizes + numLogicalRegs = numLogicalIntRegs + numLogicalFloatRegs; + numPhysicalRegs = numPhysicalIntRegs + numPhysicalFloatRegs; + + //Resize scoreboard appropriately + regScoreBoard.resize(numPhysicalRegs + (numMiscRegs * activeThreads)); + + //Initialize values + for (int i=0; i < numLogicalIntRegs * activeThreads; i++) { + regScoreBoard[i] = 1; + } + + for (int i= numPhysicalIntRegs; + i < numPhysicalIntRegs + (numLogicalFloatRegs * activeThreads); + i++) { + regScoreBoard[i] = 1; + } + + for (int i = numPhysicalRegs; + i < numPhysicalRegs + (numMiscRegs * activeThreads); + i++) { + regScoreBoard[i] = 1; + } +} + +std::string +Scoreboard::name() const +{ + return "cpu.scoreboard"; +} + +bool +Scoreboard::getReg(PhysRegIndex phys_reg) +{ + // Always ready if int or fp zero reg. + if (phys_reg == zeroRegIdx || + phys_reg == (zeroRegIdx + numPhysicalIntRegs)) { + return 1; + } + + return regScoreBoard[phys_reg]; +} + +void +Scoreboard::setReg(PhysRegIndex phys_reg) +{ + DPRINTF(Scoreboard, "Setting reg %i as ready\n", phys_reg); + + regScoreBoard[phys_reg] = 1; +} + +void +Scoreboard::unsetReg(PhysRegIndex ready_reg) +{ + if (ready_reg == zeroRegIdx || + ready_reg == (zeroRegIdx + numPhysicalIntRegs)) { + // Don't do anything if int or fp zero reg. + return; + } + + regScoreBoard[ready_reg] = 0; +} diff --git a/src/cpu/o3/scoreboard.hh b/src/cpu/o3/scoreboard.hh new file mode 100644 index 000000000..eefff1d8b --- /dev/null +++ b/src/cpu/o3/scoreboard.hh @@ -0,0 +1,116 @@ +/* + * Copyright (c) 2005-2006 The Regents of The University of Michigan + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are + * met: redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer; + * redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution; + * neither the name of the copyright holders nor the names of its + * contributors may be used to endorse or promote products derived from + * this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + * Authors: Korey Sewell + * Kevin Lim + */ + +#ifndef __CPU_O3_SCOREBOARD_HH__ +#define __CPU_O3_SCOREBOARD_HH__ + +#include <iostream> +#include <utility> +#include <vector> +#include "base/trace.hh" +#include "base/traceflags.hh" +#include "cpu/o3/comm.hh" + +/** + * Implements a simple scoreboard to track which registers are ready. + * This class assumes that the fp registers start, index wise, right after + * the integer registers. The misc. registers start, index wise, right after + * the fp registers. + * @todo: Fix up handling of the zero register in case the decoder does not + * automatically make insts that write the zero register into nops. + */ +class Scoreboard +{ + public: + /** Constructs a scoreboard. + * @param activeThreads The number of active threads. + * @param _numLogicalIntRegs Number of logical integer registers. + * @param _numPhysicalIntRegs Number of physical integer registers. + * @param _numLogicalFloatRegs Number of logical fp registers. + * @param _numPhysicalFloatRegs Number of physical fp registers. + * @param _numMiscRegs Number of miscellaneous registers. + * @param _zeroRegIdx Index of the zero register. + */ + Scoreboard(unsigned activeThreads, + unsigned _numLogicalIntRegs, + unsigned _numPhysicalIntRegs, + unsigned _numLogicalFloatRegs, + unsigned _numPhysicalFloatRegs, + unsigned _numMiscRegs, + unsigned _zeroRegIdx); + + /** Destructor. */ + ~Scoreboard() {} + + /** Returns the name of the scoreboard. */ + std::string name() const; + + /** Checks if the register is ready. */ + bool getReg(PhysRegIndex ready_reg); + + /** Sets the register as ready. */ + void setReg(PhysRegIndex phys_reg); + + /** Sets the register as not ready. */ + void unsetReg(PhysRegIndex ready_reg); + + private: + /** Scoreboard of physical integer registers, saying whether or not they + * are ready. + */ + std::vector<bool> regScoreBoard; + + /** Number of logical integer registers. */ + int numLogicalIntRegs; + + /** Number of physical integer registers. */ + int numPhysicalIntRegs; + + /** Number of logical floating point registers. */ + int numLogicalFloatRegs; + + /** Number of physical floating point registers. */ + int numPhysicalFloatRegs; + + /** Number of miscellaneous registers. */ + int numMiscRegs; + + /** Number of logical integer + float registers. */ + int numLogicalRegs; + + /** Number of physical integer + float registers. */ + int numPhysicalRegs; + + /** The logical index of the zero register. */ + int zeroRegIdx; +}; + +#endif diff --git a/src/cpu/o3/store_set.cc b/src/cpu/o3/store_set.cc new file mode 100644 index 000000000..2d28b617f --- /dev/null +++ b/src/cpu/o3/store_set.cc @@ -0,0 +1,348 @@ +/* + * Copyright (c) 2004-2006 The Regents of The University of Michigan + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are + * met: redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer; + * redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution; + * neither the name of the copyright holders nor the names of its + * contributors may be used to endorse or promote products derived from + * this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + * Authors: Kevin Lim + */ + +#include "base/intmath.hh" +#include "base/misc.hh" +#include "base/trace.hh" +#include "cpu/o3/store_set.hh" + +StoreSet::StoreSet(int _SSIT_size, int _LFST_size) + : SSITSize(_SSIT_size), LFSTSize(_LFST_size) +{ + DPRINTF(StoreSet, "StoreSet: Creating store set object.\n"); + DPRINTF(StoreSet, "StoreSet: SSIT size: %i, LFST size: %i.\n", + SSITSize, LFSTSize); + + if (!isPowerOf2(SSITSize)) { + fatal("Invalid SSIT size!\n"); + } + + SSIT.resize(SSITSize); + + validSSIT.resize(SSITSize); + + for (int i = 0; i < SSITSize; ++i) + validSSIT[i] = false; + + if (!isPowerOf2(LFSTSize)) { + fatal("Invalid LFST size!\n"); + } + + LFST.resize(LFSTSize); + + validLFST.resize(LFSTSize); + + for (int i = 0; i < LFSTSize; ++i) { + validLFST[i] = false; + LFST[i] = 0; + } + + indexMask = SSITSize - 1; + + offsetBits = 2; +} + +StoreSet::~StoreSet() +{ +} + +void +StoreSet::init(int _SSIT_size, int _LFST_size) +{ + SSITSize = _SSIT_size; + LFSTSize = _LFST_size; + + DPRINTF(StoreSet, "StoreSet: Creating store set object.\n"); + DPRINTF(StoreSet, "StoreSet: SSIT size: %i, LFST size: %i.\n", + SSITSize, LFSTSize); + + SSIT.resize(SSITSize); + + validSSIT.resize(SSITSize); + + for (int i = 0; i < SSITSize; ++i) + validSSIT[i] = false; + + LFST.resize(LFSTSize); + + validLFST.resize(LFSTSize); + + for (int i = 0; i < LFSTSize; ++i) { + validLFST[i] = false; + LFST[i] = 0; + } + + indexMask = SSITSize - 1; + + offsetBits = 2; +} + + +void +StoreSet::violation(Addr store_PC, Addr load_PC) +{ + int load_index = calcIndex(load_PC); + int store_index = calcIndex(store_PC); + + assert(load_index < SSITSize && store_index < SSITSize); + + bool valid_load_SSID = validSSIT[load_index]; + bool valid_store_SSID = validSSIT[store_index]; + + if (!valid_load_SSID && !valid_store_SSID) { + // Calculate a new SSID here. + SSID new_set = calcSSID(load_PC); + + validSSIT[load_index] = true; + + SSIT[load_index] = new_set; + + validSSIT[store_index] = true; + + SSIT[store_index] = new_set; + + assert(new_set < LFSTSize); + + DPRINTF(StoreSet, "StoreSet: Neither load nor store had a valid " + "storeset, creating a new one: %i for load %#x, store %#x\n", + new_set, load_PC, store_PC); + } else if (valid_load_SSID && !valid_store_SSID) { + SSID load_SSID = SSIT[load_index]; + + validSSIT[store_index] = true; + + SSIT[store_index] = load_SSID; + + assert(load_SSID < LFSTSize); + + DPRINTF(StoreSet, "StoreSet: Load had a valid store set. Adding " + "store to that set: %i for load %#x, store %#x\n", + load_SSID, load_PC, store_PC); + } else if (!valid_load_SSID && valid_store_SSID) { + SSID store_SSID = SSIT[store_index]; + + validSSIT[load_index] = true; + + SSIT[load_index] = store_SSID; + + DPRINTF(StoreSet, "StoreSet: Store had a valid store set: %i for " + "load %#x, store %#x\n", + store_SSID, load_PC, store_PC); + } else { + SSID load_SSID = SSIT[load_index]; + SSID store_SSID = SSIT[store_index]; + + assert(load_SSID < LFSTSize && store_SSID < LFSTSize); + + // The store set with the lower number wins + if (store_SSID > load_SSID) { + SSIT[store_index] = load_SSID; + + DPRINTF(StoreSet, "StoreSet: Load had smaller store set: %i; " + "for load %#x, store %#x\n", + load_SSID, load_PC, store_PC); + } else { + SSIT[load_index] = store_SSID; + + DPRINTF(StoreSet, "StoreSet: Store had smaller store set: %i; " + "for load %#x, store %#x\n", + store_SSID, load_PC, store_PC); + } + } +} + +void +StoreSet::insertLoad(Addr load_PC, InstSeqNum load_seq_num) +{ + // Does nothing. + return; +} + +void +StoreSet::insertStore(Addr store_PC, InstSeqNum store_seq_num, + unsigned tid) +{ + int index = calcIndex(store_PC); + + int store_SSID; + + assert(index < SSITSize); + + if (!validSSIT[index]) { + // Do nothing if there's no valid entry. + return; + } else { + store_SSID = SSIT[index]; + + assert(store_SSID < LFSTSize); + + // Update the last store that was fetched with the current one. + LFST[store_SSID] = store_seq_num; + + validLFST[store_SSID] = 1; + + storeList[store_seq_num] = store_SSID; + + DPRINTF(StoreSet, "Store %#x updated the LFST, SSID: %i\n", + store_PC, store_SSID); + } +} + +InstSeqNum +StoreSet::checkInst(Addr PC) +{ + int index = calcIndex(PC); + + int inst_SSID; + + assert(index < SSITSize); + + if (!validSSIT[index]) { + DPRINTF(StoreSet, "Inst %#x with index %i had no SSID\n", + PC, index); + + // Return 0 if there's no valid entry. + return 0; + } else { + inst_SSID = SSIT[index]; + + assert(inst_SSID < LFSTSize); + + if (!validLFST[inst_SSID]) { + + DPRINTF(StoreSet, "Inst %#x with index %i and SSID %i had no " + "dependency\n", PC, index, inst_SSID); + + return 0; + } else { + DPRINTF(StoreSet, "Inst %#x with index %i and SSID %i had LFST " + "inum of %i\n", PC, index, inst_SSID, LFST[inst_SSID]); + + return LFST[inst_SSID]; + } + } +} + +void +StoreSet::issued(Addr issued_PC, InstSeqNum issued_seq_num, bool is_store) +{ + // This only is updated upon a store being issued. + if (!is_store) { + return; + } + + int index = calcIndex(issued_PC); + + int store_SSID; + + assert(index < SSITSize); + + SeqNumMapIt store_list_it = storeList.find(issued_seq_num); + + if (store_list_it != storeList.end()) { + storeList.erase(store_list_it); + } + + // Make sure the SSIT still has a valid entry for the issued store. + if (!validSSIT[index]) { + return; + } + + store_SSID = SSIT[index]; + + assert(store_SSID < LFSTSize); + + // If the last fetched store in the store set refers to the store that + // was just issued, then invalidate the entry. + if (validLFST[store_SSID] && LFST[store_SSID] == issued_seq_num) { + DPRINTF(StoreSet, "StoreSet: store invalidated itself in LFST.\n"); + validLFST[store_SSID] = false; + } +} + +void +StoreSet::squash(InstSeqNum squashed_num, unsigned tid) +{ + DPRINTF(StoreSet, "StoreSet: Squashing until inum %i\n", + squashed_num); + + int idx; + SeqNumMapIt store_list_it = storeList.begin(); + + //@todo:Fix to only delete from correct thread + while (!storeList.empty()) { + idx = (*store_list_it).second; + + if ((*store_list_it).first <= squashed_num) { + break; + } + + bool younger = LFST[idx] > squashed_num; + + if (validLFST[idx] && younger) { + DPRINTF(StoreSet, "Squashed [sn:%lli]\n", LFST[idx]); + validLFST[idx] = false; + + storeList.erase(store_list_it++); + } else if (!validLFST[idx] && younger) { + storeList.erase(store_list_it++); + } + } +} + +void +StoreSet::clear() +{ + for (int i = 0; i < SSITSize; ++i) { + validSSIT[i] = false; + } + + for (int i = 0; i < LFSTSize; ++i) { + validLFST[i] = false; + } + + storeList.clear(); +} + +void +StoreSet::dump() +{ + cprintf("storeList.size(): %i\n", storeList.size()); + SeqNumMapIt store_list_it = storeList.begin(); + + int num = 0; + + while (store_list_it != storeList.end()) { + cprintf("%i: [sn:%lli] SSID:%i\n", + num, (*store_list_it).first, (*store_list_it).second); + num++; + store_list_it++; + } +} diff --git a/src/cpu/o3/store_set.hh b/src/cpu/o3/store_set.hh new file mode 100644 index 000000000..f9f7637d0 --- /dev/null +++ b/src/cpu/o3/store_set.hh @@ -0,0 +1,147 @@ +/* + * Copyright (c) 2004-2005 The Regents of The University of Michigan + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are + * met: redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer; + * redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution; + * neither the name of the copyright holders nor the names of its + * contributors may be used to endorse or promote products derived from + * this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + * Authors: Kevin Lim + */ + +#ifndef __CPU_O3_STORE_SET_HH__ +#define __CPU_O3_STORE_SET_HH__ + +#include <list> +#include <map> +#include <utility> +#include <vector> + +#include "cpu/inst_seq.hh" +#include "sim/host.hh" + +struct ltseqnum { + bool operator()(const InstSeqNum &lhs, const InstSeqNum &rhs) const + { + return lhs > rhs; + } +}; + +/** + * Implements a store set predictor for determining if memory + * instructions are dependent upon each other. See paper "Memory + * Dependence Prediction using Store Sets" by Chrysos and Emer. SSID + * stands for Store Set ID, SSIT stands for Store Set ID Table, and + * LFST is Last Fetched Store Table. + */ +class StoreSet +{ + public: + typedef unsigned SSID; + + public: + /** Default constructor. init() must be called prior to use. */ + StoreSet() { }; + + /** Creates store set predictor with given table sizes. */ + StoreSet(int SSIT_size, int LFST_size); + + /** Default destructor. */ + ~StoreSet(); + + /** Initializes the store set predictor with the given table sizes. */ + void init(int SSIT_size, int LFST_size); + + /** Records a memory ordering violation between the younger load + * and the older store. */ + void violation(Addr store_PC, Addr load_PC); + + /** Inserts a load into the store set predictor. This does nothing but + * is included in case other predictors require a similar function. + */ + void insertLoad(Addr load_PC, InstSeqNum load_seq_num); + + /** Inserts a store into the store set predictor. Updates the + * LFST if the store has a valid SSID. */ + void insertStore(Addr store_PC, InstSeqNum store_seq_num, + unsigned tid); + + /** Checks if the instruction with the given PC is dependent upon + * any store. @return Returns the sequence number of the store + * instruction this PC is dependent upon. Returns 0 if none. + */ + InstSeqNum checkInst(Addr PC); + + /** Records this PC/sequence number as issued. */ + void issued(Addr issued_PC, InstSeqNum issued_seq_num, bool is_store); + + /** Squashes for a specific thread until the given sequence number. */ + void squash(InstSeqNum squashed_num, unsigned tid); + + /** Resets all tables. */ + void clear(); + + /** Debug function to dump the contents of the store list. */ + void dump(); + + private: + /** Calculates the index into the SSIT based on the PC. */ + inline int calcIndex(Addr PC) + { return (PC >> offsetBits) & indexMask; } + + /** Calculates a Store Set ID based on the PC. */ + inline SSID calcSSID(Addr PC) + { return ((PC ^ (PC >> 10)) % LFSTSize); } + + /** The Store Set ID Table. */ + std::vector<SSID> SSIT; + + /** Bit vector to tell if the SSIT has a valid entry. */ + std::vector<bool> validSSIT; + + /** Last Fetched Store Table. */ + std::vector<InstSeqNum> LFST; + + /** Bit vector to tell if the LFST has a valid entry. */ + std::vector<bool> validLFST; + + /** Map of stores that have been inserted into the store set, but + * not yet issued or squashed. + */ + std::map<InstSeqNum, int, ltseqnum> storeList; + + typedef std::map<InstSeqNum, int, ltseqnum>::iterator SeqNumMapIt; + + /** Store Set ID Table size, in entries. */ + int SSITSize; + + /** Last Fetched Store Table size, in entries. */ + int LFSTSize; + + /** Mask to obtain the index. */ + int indexMask; + + // HACK: Hardcoded for now. + int offsetBits; +}; + +#endif // __CPU_O3_STORE_SET_HH__ diff --git a/src/cpu/o3/thread_context.hh b/src/cpu/o3/thread_context.hh new file mode 100755 index 000000000..9ca02b9f3 --- /dev/null +++ b/src/cpu/o3/thread_context.hh @@ -0,0 +1,250 @@ +/* + * Copyright (c) 2004-2006 The Regents of The University of Michigan + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are + * met: redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer; + * redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution; + * neither the name of the copyright holders nor the names of its + * contributors may be used to endorse or promote products derived from + * this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + * Authors: Kevin Lim + */ + +#ifndef __CPU_O3_THREAD_CONTEXT_HH__ +#define __CPU_O3_THREAD_CONTEXT_HH__ + +#include "cpu/thread_context.hh" +#include "cpu/o3/isa_specific.hh" + +class EndQuiesceEvent; +namespace Kernel { + class Statistics; +}; + +class TranslatingPort; + +/** + * Derived ThreadContext class for use with the O3CPU. It + * provides the interface for any external objects to access a + * single thread's state and some general CPU state. Any time + * external objects try to update state through this interface, + * the CPU will create an event to squash all in-flight + * instructions in order to ensure state is maintained correctly. + * It must be defined specifically for the O3CPU because + * not all architectural state is located within the O3ThreadState + * (such as the commit PC, and registers), and specific actions + * must be taken when using this interface (such as squashing all + * in-flight instructions when doing a write to this interface). + */ +template <class Impl> +class O3ThreadContext : public ThreadContext +{ + public: + typedef typename Impl::O3CPU O3CPU; + + /** Pointer to the CPU. */ + O3CPU *cpu; + + /** Pointer to the thread state that this TC corrseponds to. */ + O3ThreadState<Impl> *thread; + + /** Returns a pointer to this CPU. */ + virtual BaseCPU *getCpuPtr() { return cpu; } + + /** Sets this CPU's ID. */ + virtual void setCpuId(int id) { cpu->setCpuId(id); } + + /** Reads this CPU's ID. */ + virtual int readCpuId() { return cpu->readCpuId(); } + +#if FULL_SYSTEM + /** Returns a pointer to the system. */ + virtual System *getSystemPtr() { return cpu->system; } + + /** Returns a pointer to physical memory. */ + virtual PhysicalMemory *getPhysMemPtr() { return cpu->physmem; } + + /** Returns a pointer to this thread's kernel statistics. */ + virtual Kernel::Statistics *getKernelStats() + { return thread->kernelStats; } + + virtual FunctionalPort *getPhysPort() { return thread->getPhysPort(); } + + virtual VirtualPort *getVirtPort(ThreadContext *src_tc = NULL); + + void delVirtPort(VirtualPort *vp); +#else + virtual TranslatingPort *getMemPort() { return thread->getMemPort(); } + + /** Returns a pointer to this thread's process. */ + virtual Process *getProcessPtr() { return thread->getProcessPtr(); } +#endif + /** Returns this thread's status. */ + virtual Status status() const { return thread->status(); } + + /** Sets this thread's status. */ + virtual void setStatus(Status new_status) + { thread->setStatus(new_status); } + + /** Set the status to Active. Optional delay indicates number of + * cycles to wait before beginning execution. */ + virtual void activate(int delay = 1); + + /** Set the status to Suspended. */ + virtual void suspend(); + + /** Set the status to Unallocated. */ + virtual void deallocate(int delay = 0); + + /** Set the status to Halted. */ + virtual void halt(); + +#if FULL_SYSTEM + /** Dumps the function profiling information. + * @todo: Implement. + */ + virtual void dumpFuncProfile(); +#endif + /** Takes over execution of a thread from another CPU. */ + virtual void takeOverFrom(ThreadContext *old_context); + + /** Registers statistics associated with this TC. */ + virtual void regStats(const std::string &name); + + /** Serializes state. */ + virtual void serialize(std::ostream &os); + /** Unserializes state. */ + virtual void unserialize(Checkpoint *cp, const std::string §ion); + +#if FULL_SYSTEM + /** Reads the last tick that this thread was activated on. */ + virtual Tick readLastActivate(); + /** Reads the last tick that this thread was suspended on. */ + virtual Tick readLastSuspend(); + + /** Clears the function profiling information. */ + virtual void profileClear(); + /** Samples the function profiling information. */ + virtual void profileSample(); +#endif + /** Returns this thread's ID number. */ + virtual int getThreadNum() { return thread->readTid(); } + + /** Returns the instruction this thread is currently committing. + * Only used when an instruction faults. + */ + virtual TheISA::MachInst getInst(); + + /** Copies the architectural registers from another TC into this TC. */ + virtual void copyArchRegs(ThreadContext *tc); + + /** Resets all architectural registers to 0. */ + virtual void clearArchRegs(); + + /** Reads an integer register. */ + virtual uint64_t readIntReg(int reg_idx); + + virtual FloatReg readFloatReg(int reg_idx, int width); + + virtual FloatReg readFloatReg(int reg_idx); + + virtual FloatRegBits readFloatRegBits(int reg_idx, int width); + + virtual FloatRegBits readFloatRegBits(int reg_idx); + + /** Sets an integer register to a value. */ + virtual void setIntReg(int reg_idx, uint64_t val); + + virtual void setFloatReg(int reg_idx, FloatReg val, int width); + + virtual void setFloatReg(int reg_idx, FloatReg val); + + virtual void setFloatRegBits(int reg_idx, FloatRegBits val, int width); + + virtual void setFloatRegBits(int reg_idx, FloatRegBits val); + + /** Reads this thread's PC. */ + virtual uint64_t readPC() + { return cpu->readPC(thread->readTid()); } + + /** Sets this thread's PC. */ + virtual void setPC(uint64_t val); + + /** Reads this thread's next PC. */ + virtual uint64_t readNextPC() + { return cpu->readNextPC(thread->readTid()); } + + /** Sets this thread's next PC. */ + virtual void setNextPC(uint64_t val); + + /** Reads a miscellaneous register. */ + virtual MiscReg readMiscReg(int misc_reg) + { return cpu->readMiscReg(misc_reg, thread->readTid()); } + + /** Reads a misc. register, including any side-effects the + * read might have as defined by the architecture. */ + virtual MiscReg readMiscRegWithEffect(int misc_reg, Fault &fault) + { return cpu->readMiscRegWithEffect(misc_reg, fault, thread->readTid()); } + + /** Sets a misc. register. */ + virtual Fault setMiscReg(int misc_reg, const MiscReg &val); + + /** Sets a misc. register, including any side-effects the + * write might have as defined by the architecture. */ + virtual Fault setMiscRegWithEffect(int misc_reg, const MiscReg &val); + + /** Returns the number of consecutive store conditional failures. */ + // @todo: Figure out where these store cond failures should go. + virtual unsigned readStCondFailures() + { return thread->storeCondFailures; } + + /** Sets the number of consecutive store conditional failures. */ + virtual void setStCondFailures(unsigned sc_failures) + { thread->storeCondFailures = sc_failures; } + + // Only really makes sense for old CPU model. Lots of code + // outside the CPU still checks this function, so it will + // always return false to keep everything working. + /** Checks if the thread is misspeculating. Because it is + * very difficult to determine if the thread is + * misspeculating, this is set as false. */ + virtual bool misspeculating() { return false; } + +#if !FULL_SYSTEM + /** Gets a syscall argument by index. */ + virtual IntReg getSyscallArg(int i); + + /** Sets a syscall argument. */ + virtual void setSyscallArg(int i, IntReg val); + + /** Sets the syscall return value. */ + virtual void setSyscallReturn(SyscallReturn return_value); + + /** Executes a syscall in SE mode. */ + virtual void syscall(int64_t callnum) + { return cpu->syscall(callnum, thread->readTid()); } + + /** Reads the funcExeInst counter. */ + virtual Counter readFuncExeInst() { return thread->funcExeInst; } +#endif +}; + +#endif diff --git a/src/cpu/o3/thread_context_impl.hh b/src/cpu/o3/thread_context_impl.hh new file mode 100755 index 000000000..a4546e669 --- /dev/null +++ b/src/cpu/o3/thread_context_impl.hh @@ -0,0 +1,491 @@ +/* + * Copyright (c) 2004-2006 The Regents of The University of Michigan + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are + * met: redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer; + * redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution; + * neither the name of the copyright holders nor the names of its + * contributors may be used to endorse or promote products derived from + * this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + * Authors: Kevin Lim + * Korey Sewell + */ + +#include "cpu/o3/thread_context.hh" +#include "cpu/quiesce_event.hh" + +#if FULL_SYSTEM +template <class Impl> +VirtualPort * +O3ThreadContext<Impl>::getVirtPort(ThreadContext *src_tc) +{ + if (!src_tc) + return thread->getVirtPort(); + + VirtualPort *vp; + Port *mem_port; + + vp = new VirtualPort("tc-vport", src_tc); + mem_port = cpu->system->physmem->getPort("functional"); + mem_port->setPeer(vp); + vp->setPeer(mem_port); + return vp; +} + +template <class Impl> +void +O3ThreadContext<Impl>::dumpFuncProfile() +{ + // Currently not supported +} +#endif + +template <class Impl> +void +O3ThreadContext<Impl>::takeOverFrom(ThreadContext *old_context) +{ + // some things should already be set up +#if FULL_SYSTEM + assert(getSystemPtr() == old_context->getSystemPtr()); +#else + assert(getProcessPtr() == old_context->getProcessPtr()); +#endif + + // copy over functional state + setStatus(old_context->status()); + copyArchRegs(old_context); + setCpuId(old_context->readCpuId()); + +#if !FULL_SYSTEM + thread->funcExeInst = old_context->readFuncExeInst(); +#else + EndQuiesceEvent *other_quiesce = old_context->getQuiesceEvent(); + if (other_quiesce) { + // Point the quiesce event's TC at this TC so that it wakes up + // the proper CPU. + other_quiesce->tc = this; + } + if (thread->quiesceEvent) { + thread->quiesceEvent->tc = this; + } + + // Transfer kernel stats from one CPU to the other. + thread->kernelStats = old_context->getKernelStats(); +// storeCondFailures = 0; + cpu->lockFlag = false; +#endif + + old_context->setStatus(ThreadContext::Unallocated); + + thread->inSyscall = false; + thread->trapPending = false; +} + +#if FULL_SYSTEM +template <class Impl> +void +O3ThreadContext<Impl>::delVirtPort(VirtualPort *vp) +{ + delete vp->getPeer(); + delete vp; +} +#endif + +template <class Impl> +void +O3ThreadContext<Impl>::activate(int delay) +{ + DPRINTF(O3CPU, "Calling activate on Thread Context %d\n", + getThreadNum()); + + if (thread->status() == ThreadContext::Active) + return; + +#if FULL_SYSTEM + thread->lastActivate = curTick; +#endif + + if (thread->status() == ThreadContext::Unallocated) { + cpu->activateWhenReady(thread->readTid()); + return; + } + + thread->setStatus(ThreadContext::Active); + + // status() == Suspended + cpu->activateContext(thread->readTid(), delay); +} + +template <class Impl> +void +O3ThreadContext<Impl>::suspend() +{ + DPRINTF(O3CPU, "Calling suspend on Thread Context %d\n", + getThreadNum()); + + if (thread->status() == ThreadContext::Suspended) + return; + +#if FULL_SYSTEM + thread->lastActivate = curTick; + thread->lastSuspend = curTick; +#endif +/* +#if FULL_SYSTEM + // Don't change the status from active if there are pending interrupts + if (cpu->check_interrupts()) { + assert(status() == ThreadContext::Active); + return; + } +#endif +*/ + thread->setStatus(ThreadContext::Suspended); + cpu->suspendContext(thread->readTid()); +} + +template <class Impl> +void +O3ThreadContext<Impl>::deallocate(int delay) +{ + DPRINTF(O3CPU, "Calling deallocate on Thread Context %d\n", + getThreadNum()); + + if (thread->status() == ThreadContext::Unallocated) + return; + + thread->setStatus(ThreadContext::Unallocated); + cpu->deallocateContext(thread->readTid(), delay); +} + +template <class Impl> +void +O3ThreadContext<Impl>::halt() +{ + DPRINTF(O3CPU, "Calling halt on Thread Context %d\n", + getThreadNum()); + + if (thread->status() == ThreadContext::Halted) + return; + + thread->setStatus(ThreadContext::Halted); + cpu->haltContext(thread->readTid()); +} + +template <class Impl> +void +O3ThreadContext<Impl>::regStats(const std::string &name) +{ +#if FULL_SYSTEM + thread->kernelStats = new Kernel::Statistics(cpu->system); + thread->kernelStats->regStats(name + ".kern"); +#endif +} + +template <class Impl> +void +O3ThreadContext<Impl>::serialize(std::ostream &os) +{ +#if FULL_SYSTEM + if (thread->kernelStats) + thread->kernelStats->serialize(os); +#endif + +} + +template <class Impl> +void +O3ThreadContext<Impl>::unserialize(Checkpoint *cp, const std::string §ion) +{ +#if FULL_SYSTEM + if (thread->kernelStats) + thread->kernelStats->unserialize(cp, section); +#endif + +} + +#if FULL_SYSTEM +template <class Impl> +Tick +O3ThreadContext<Impl>::readLastActivate() +{ + return thread->lastActivate; +} + +template <class Impl> +Tick +O3ThreadContext<Impl>::readLastSuspend() +{ + return thread->lastSuspend; +} + +template <class Impl> +void +O3ThreadContext<Impl>::profileClear() +{} + +template <class Impl> +void +O3ThreadContext<Impl>::profileSample() +{} +#endif + +template <class Impl> +TheISA::MachInst +O3ThreadContext<Impl>:: getInst() +{ + return thread->getInst(); +} + +template <class Impl> +void +O3ThreadContext<Impl>::copyArchRegs(ThreadContext *tc) +{ + // This function will mess things up unless the ROB is empty and + // there are no instructions in the pipeline. + unsigned tid = thread->readTid(); + PhysRegIndex renamed_reg; + + // First loop through the integer registers. + for (int i = 0; i < TheISA::NumIntRegs; ++i) { + renamed_reg = cpu->renameMap[tid].lookup(i); + + DPRINTF(O3CPU, "Copying over register %i, had data %lli, " + "now has data %lli.\n", + renamed_reg, cpu->readIntReg(renamed_reg), + tc->readIntReg(i)); + + cpu->setIntReg(renamed_reg, tc->readIntReg(i)); + } + + // Then loop through the floating point registers. + for (int i = 0; i < TheISA::NumFloatRegs; ++i) { + renamed_reg = cpu->renameMap[tid].lookup(i + TheISA::FP_Base_DepTag); + cpu->setFloatRegBits(renamed_reg, + tc->readFloatRegBits(i)); + } + + // Copy the misc regs. + TheISA::copyMiscRegs(tc, this); + + // Then finally set the PC and the next PC. + cpu->setPC(tc->readPC(), tid); + cpu->setNextPC(tc->readNextPC(), tid); +#if !FULL_SYSTEM + this->thread->funcExeInst = tc->readFuncExeInst(); +#endif +} + +template <class Impl> +void +O3ThreadContext<Impl>::clearArchRegs() +{} + +template <class Impl> +uint64_t +O3ThreadContext<Impl>::readIntReg(int reg_idx) +{ + return cpu->readArchIntReg(reg_idx, thread->readTid()); +} + +template <class Impl> +TheISA::FloatReg +O3ThreadContext<Impl>::readFloatReg(int reg_idx, int width) +{ + switch(width) { + case 32: + return cpu->readArchFloatRegSingle(reg_idx, thread->readTid()); + case 64: + return cpu->readArchFloatRegDouble(reg_idx, thread->readTid()); + default: + panic("Unsupported width!"); + return 0; + } +} + +template <class Impl> +TheISA::FloatReg +O3ThreadContext<Impl>::readFloatReg(int reg_idx) +{ + return cpu->readArchFloatRegSingle(reg_idx, thread->readTid()); +} + +template <class Impl> +TheISA::FloatRegBits +O3ThreadContext<Impl>::readFloatRegBits(int reg_idx, int width) +{ + DPRINTF(Fault, "Reading floatint register through the TC!\n"); + return cpu->readArchFloatRegInt(reg_idx, thread->readTid()); +} + +template <class Impl> +TheISA::FloatRegBits +O3ThreadContext<Impl>::readFloatRegBits(int reg_idx) +{ + return cpu->readArchFloatRegInt(reg_idx, thread->readTid()); +} + +template <class Impl> +void +O3ThreadContext<Impl>::setIntReg(int reg_idx, uint64_t val) +{ + cpu->setArchIntReg(reg_idx, val, thread->readTid()); + + // Squash if we're not already in a state update mode. + if (!thread->trapPending && !thread->inSyscall) { + cpu->squashFromTC(thread->readTid()); + } +} + +template <class Impl> +void +O3ThreadContext<Impl>::setFloatReg(int reg_idx, FloatReg val, int width) +{ + switch(width) { + case 32: + cpu->setArchFloatRegSingle(reg_idx, val, thread->readTid()); + break; + case 64: + cpu->setArchFloatRegDouble(reg_idx, val, thread->readTid()); + break; + } + + // Squash if we're not already in a state update mode. + if (!thread->trapPending && !thread->inSyscall) { + cpu->squashFromTC(thread->readTid()); + } +} + +template <class Impl> +void +O3ThreadContext<Impl>::setFloatReg(int reg_idx, FloatReg val) +{ + cpu->setArchFloatRegSingle(reg_idx, val, thread->readTid()); + + if (!thread->trapPending && !thread->inSyscall) { + cpu->squashFromTC(thread->readTid()); + } +} + +template <class Impl> +void +O3ThreadContext<Impl>::setFloatRegBits(int reg_idx, FloatRegBits val, + int width) +{ + DPRINTF(Fault, "Setting floatint register through the TC!\n"); + cpu->setArchFloatRegInt(reg_idx, val, thread->readTid()); + + // Squash if we're not already in a state update mode. + if (!thread->trapPending && !thread->inSyscall) { + cpu->squashFromTC(thread->readTid()); + } +} + +template <class Impl> +void +O3ThreadContext<Impl>::setFloatRegBits(int reg_idx, FloatRegBits val) +{ + cpu->setArchFloatRegInt(reg_idx, val, thread->readTid()); + + // Squash if we're not already in a state update mode. + if (!thread->trapPending && !thread->inSyscall) { + cpu->squashFromTC(thread->readTid()); + } +} + +template <class Impl> +void +O3ThreadContext<Impl>::setPC(uint64_t val) +{ + cpu->setPC(val, thread->readTid()); + + // Squash if we're not already in a state update mode. + if (!thread->trapPending && !thread->inSyscall) { + cpu->squashFromTC(thread->readTid()); + } +} + +template <class Impl> +void +O3ThreadContext<Impl>::setNextPC(uint64_t val) +{ + cpu->setNextPC(val, thread->readTid()); + + // Squash if we're not already in a state update mode. + if (!thread->trapPending && !thread->inSyscall) { + cpu->squashFromTC(thread->readTid()); + } +} + +template <class Impl> +Fault +O3ThreadContext<Impl>::setMiscReg(int misc_reg, const MiscReg &val) +{ + Fault ret_fault = cpu->setMiscReg(misc_reg, val, thread->readTid()); + + // Squash if we're not already in a state update mode. + if (!thread->trapPending && !thread->inSyscall) { + cpu->squashFromTC(thread->readTid()); + } + + return ret_fault; +} + +template <class Impl> +Fault +O3ThreadContext<Impl>::setMiscRegWithEffect(int misc_reg, + const MiscReg &val) +{ + Fault ret_fault = cpu->setMiscRegWithEffect(misc_reg, val, + thread->readTid()); + + // Squash if we're not already in a state update mode. + if (!thread->trapPending && !thread->inSyscall) { + cpu->squashFromTC(thread->readTid()); + } + + return ret_fault; +} + +#if !FULL_SYSTEM + +template <class Impl> +TheISA::IntReg +O3ThreadContext<Impl>::getSyscallArg(int i) +{ + return cpu->getSyscallArg(i, thread->readTid()); +} + +template <class Impl> +void +O3ThreadContext<Impl>::setSyscallArg(int i, IntReg val) +{ + cpu->setSyscallArg(i, val, thread->readTid()); +} + +template <class Impl> +void +O3ThreadContext<Impl>::setSyscallReturn(SyscallReturn return_value) +{ + cpu->setSyscallReturn(return_value, thread->readTid()); +} + +#endif // FULL_SYSTEM + diff --git a/src/cpu/o3/thread_state.hh b/src/cpu/o3/thread_state.hh new file mode 100644 index 000000000..0247deb52 --- /dev/null +++ b/src/cpu/o3/thread_state.hh @@ -0,0 +1,125 @@ +/* + * Copyright (c) 2006 The Regents of The University of Michigan + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are + * met: redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer; + * redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution; + * neither the name of the copyright holders nor the names of its + * contributors may be used to endorse or promote products derived from + * this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + * Authors: Kevin Lim + */ + +#ifndef __CPU_O3_THREAD_STATE_HH__ +#define __CPU_O3_THREAD_STATE_HH__ + +#include "base/callback.hh" +#include "base/output.hh" +#include "cpu/thread_context.hh" +#include "cpu/thread_state.hh" +#include "sim/sim_exit.hh" + +class Event; +class Process; + +#if FULL_SYSTEM +class EndQuiesceEvent; +class FunctionProfile; +class ProfileNode; +#else +class FunctionalMemory; +class Process; +#endif + +/** + * Class that has various thread state, such as the status, the + * current instruction being processed, whether or not the thread has + * a trap pending or is being externally updated, the ThreadContext + * pointer, etc. It also handles anything related to a specific + * thread's process, such as syscalls and checking valid addresses. + */ +template <class Impl> +struct O3ThreadState : public ThreadState { + typedef ThreadContext::Status Status; + typedef typename Impl::O3CPU O3CPU; + + private: + /** Pointer to the CPU. */ + O3CPU *cpu; + public: + /** Whether or not the thread is currently in syscall mode, and + * thus able to be externally updated without squashing. + */ + bool inSyscall; + + /** Whether or not the thread is currently waiting on a trap, and + * thus able to be externally updated without squashing. + */ + bool trapPending; + +#if FULL_SYSTEM + O3ThreadState(O3CPU *_cpu, int _thread_num) + : ThreadState(-1, _thread_num), + cpu(_cpu), inSyscall(0), trapPending(0) + { + if (cpu->params->profile) { + profile = new FunctionProfile(cpu->params->system->kernelSymtab); + Callback *cb = + new MakeCallback<O3ThreadState, + &O3ThreadState::dumpFuncProfile>(this); + registerExitCallback(cb); + } + + // let's fill with a dummy node for now so we don't get a segfault + // on the first cycle when there's no node available. + static ProfileNode dummyNode; + profileNode = &dummyNode; + profilePC = 3; + } +#else + O3ThreadState(O3CPU *_cpu, int _thread_num, Process *_process, int _asid, + MemObject *mem) + : ThreadState(-1, _thread_num, _process, _asid, mem), + cpu(_cpu), inSyscall(0), trapPending(0) + { } +#endif + + /** Pointer to the ThreadContext of this thread. */ + ThreadContext *tc; + + /** Returns a pointer to the TC of this thread. */ + ThreadContext *getTC() { return tc; } + +#if !FULL_SYSTEM + /** Handles the syscall. */ + void syscall(int64_t callnum) { process->syscall(callnum, tc); } +#endif + +#if FULL_SYSTEM + void dumpFuncProfile() + { + std::ostream *os = simout.create(csprintf("profile.%s.dat", cpu->name())); + profile->dump(xcProxy, *os); + } +#endif +}; + +#endif // __CPU_O3_THREAD_STATE_HH__ diff --git a/src/cpu/o3/tournament_pred.cc b/src/cpu/o3/tournament_pred.cc new file mode 100644 index 000000000..ffb941c77 --- /dev/null +++ b/src/cpu/o3/tournament_pred.cc @@ -0,0 +1,297 @@ +/* + * Copyright (c) 2004-2006 The Regents of The University of Michigan + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are + * met: redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer; + * redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution; + * neither the name of the copyright holders nor the names of its + * contributors may be used to endorse or promote products derived from + * this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + * Authors: Kevin Lim + */ + +#include "base/intmath.hh" +#include "cpu/o3/tournament_pred.hh" + +TournamentBP::TournamentBP(unsigned _localPredictorSize, + unsigned _localCtrBits, + unsigned _localHistoryTableSize, + unsigned _localHistoryBits, + unsigned _globalPredictorSize, + unsigned _globalCtrBits, + unsigned _globalHistoryBits, + unsigned _choicePredictorSize, + unsigned _choiceCtrBits, + unsigned _instShiftAmt) + : localPredictorSize(_localPredictorSize), + localCtrBits(_localCtrBits), + localHistoryTableSize(_localHistoryTableSize), + localHistoryBits(_localHistoryBits), + globalPredictorSize(_globalPredictorSize), + globalCtrBits(_globalCtrBits), + globalHistoryBits(_globalHistoryBits), + choicePredictorSize(_globalPredictorSize), + choiceCtrBits(_choiceCtrBits), + instShiftAmt(_instShiftAmt) +{ + if (!isPowerOf2(localPredictorSize)) { + fatal("Invalid local predictor size!\n"); + } + + //Setup the array of counters for the local predictor + localCtrs.resize(localPredictorSize); + + for (int i = 0; i < localPredictorSize; ++i) + localCtrs[i].setBits(localCtrBits); + + localPredictorMask = floorPow2(localPredictorSize) - 1; + + if (!isPowerOf2(localHistoryTableSize)) { + fatal("Invalid local history table size!\n"); + } + + //Setup the history table for the local table + localHistoryTable.resize(localHistoryTableSize); + + for (int i = 0; i < localHistoryTableSize; ++i) + localHistoryTable[i] = 0; + + // Setup the local history mask + localHistoryMask = (1 << localHistoryBits) - 1; + + if (!isPowerOf2(globalPredictorSize)) { + fatal("Invalid global predictor size!\n"); + } + + //Setup the array of counters for the global predictor + globalCtrs.resize(globalPredictorSize); + + for (int i = 0; i < globalPredictorSize; ++i) + globalCtrs[i].setBits(globalCtrBits); + + //Clear the global history + globalHistory = 0; + // Setup the global history mask + globalHistoryMask = (1 << globalHistoryBits) - 1; + + if (!isPowerOf2(choicePredictorSize)) { + fatal("Invalid choice predictor size!\n"); + } + + //Setup the array of counters for the choice predictor + choiceCtrs.resize(choicePredictorSize); + + for (int i = 0; i < choicePredictorSize; ++i) + choiceCtrs[i].setBits(choiceCtrBits); + + // @todo: Allow for different thresholds between the predictors. + threshold = (1 << (localCtrBits - 1)) - 1; + threshold = threshold / 2; +} + +inline +unsigned +TournamentBP::calcLocHistIdx(Addr &branch_addr) +{ + // Get low order bits after removing instruction offset. + return (branch_addr >> instShiftAmt) & (localHistoryTableSize - 1); +} + +inline +void +TournamentBP::updateGlobalHistTaken() +{ + globalHistory = (globalHistory << 1) | 1; + globalHistory = globalHistory & globalHistoryMask; +} + +inline +void +TournamentBP::updateGlobalHistNotTaken() +{ + globalHistory = (globalHistory << 1); + globalHistory = globalHistory & globalHistoryMask; +} + +inline +void +TournamentBP::updateLocalHistTaken(unsigned local_history_idx) +{ + localHistoryTable[local_history_idx] = + (localHistoryTable[local_history_idx] << 1) | 1; +} + +inline +void +TournamentBP::updateLocalHistNotTaken(unsigned local_history_idx) +{ + localHistoryTable[local_history_idx] = + (localHistoryTable[local_history_idx] << 1); +} + +bool +TournamentBP::lookup(Addr &branch_addr, void * &bp_history) +{ + bool local_prediction; + unsigned local_history_idx; + unsigned local_predictor_idx; + + bool global_prediction; + bool choice_prediction; + + //Lookup in the local predictor to get its branch prediction + local_history_idx = calcLocHistIdx(branch_addr); + local_predictor_idx = localHistoryTable[local_history_idx] + & localPredictorMask; + local_prediction = localCtrs[local_predictor_idx].read() > threshold; + + //Lookup in the global predictor to get its branch prediction + global_prediction = globalCtrs[globalHistory].read() > threshold; + + //Lookup in the choice predictor to see which one to use + choice_prediction = choiceCtrs[globalHistory].read() > threshold; + + // Create BPHistory and pass it back to be recorded. + BPHistory *history = new BPHistory; + history->globalHistory = globalHistory; + history->localPredTaken = local_prediction; + history->globalPredTaken = global_prediction; + history->globalUsed = choice_prediction; + bp_history = (void *)history; + + assert(globalHistory < globalPredictorSize && + local_history_idx < localHistoryTableSize && + local_predictor_idx < localPredictorSize); + + // Commented code is for doing speculative update of counters and + // all histories. + if (choice_prediction) { + if (global_prediction) { +// updateHistoriesTaken(local_history_idx); +// globalCtrs[globalHistory].increment(); +// localCtrs[local_history_idx].increment(); + updateGlobalHistTaken(); + return true; + } else { +// updateHistoriesNotTaken(local_history_idx); +// globalCtrs[globalHistory].decrement(); +// localCtrs[local_history_idx].decrement(); + updateGlobalHistNotTaken(); + return false; + } + } else { + if (local_prediction) { +// updateHistoriesTaken(local_history_idx); +// globalCtrs[globalHistory].increment(); +// localCtrs[local_history_idx].increment(); + updateGlobalHistTaken(); + return true; + } else { +// updateHistoriesNotTaken(local_history_idx); +// globalCtrs[globalHistory].decrement(); +// localCtrs[local_history_idx].decrement(); + updateGlobalHistNotTaken(); + return false; + } + } +} + +void +TournamentBP::uncondBr(void * &bp_history) +{ + // Create BPHistory and pass it back to be recorded. + BPHistory *history = new BPHistory; + history->globalHistory = globalHistory; + history->localPredTaken = true; + history->globalPredTaken = true; + bp_history = static_cast<void *>(history); + + updateGlobalHistTaken(); +} + +void +TournamentBP::update(Addr &branch_addr, bool taken, void *bp_history) +{ + unsigned local_history_idx; + unsigned local_predictor_idx; + unsigned local_predictor_hist; + + // Get the local predictor's current prediction + local_history_idx = calcLocHistIdx(branch_addr); + local_predictor_hist = localHistoryTable[local_history_idx]; + local_predictor_idx = local_predictor_hist & localPredictorMask; + + // Update the choice predictor to tell it which one was correct if + // there was a prediction. + if (bp_history) { + BPHistory *history = static_cast<BPHistory *>(bp_history); + if (history->localPredTaken != history->globalPredTaken) { + // If the local prediction matches the actual outcome, + // decerement the counter. Otherwise increment the + // counter. + if (history->localPredTaken == taken) { + choiceCtrs[globalHistory].decrement(); + } else if (history->globalPredTaken == taken){ + choiceCtrs[globalHistory].increment(); + } + } + + // We're done with this history, now delete it. + delete history; + } + + assert(globalHistory < globalPredictorSize && + local_history_idx < localHistoryTableSize && + local_predictor_idx < localPredictorSize); + + // Update the counters and local history with the proper + // resolution of the branch. Global history is updated + // speculatively and restored upon squash() calls, so it does not + // need to be updated. + if (taken) { + localCtrs[local_predictor_idx].increment(); + globalCtrs[globalHistory].increment(); + + updateLocalHistTaken(local_history_idx); + } else { + localCtrs[local_predictor_idx].decrement(); + globalCtrs[globalHistory].decrement(); + + updateLocalHistNotTaken(local_history_idx); + } +} + +void +TournamentBP::squash(void *bp_history) +{ + BPHistory *history = static_cast<BPHistory *>(bp_history); + + // Restore global history to state prior to this branch. + globalHistory = history->globalHistory; + + // Delete this BPHistory now that we're done with it. + delete history; +} + +#ifdef DEBUG +int +TournamentBP::BPHistory::newCount = 0; +#endif diff --git a/src/cpu/o3/tournament_pred.hh b/src/cpu/o3/tournament_pred.hh new file mode 100644 index 000000000..472944910 --- /dev/null +++ b/src/cpu/o3/tournament_pred.hh @@ -0,0 +1,220 @@ +/* + * Copyright (c) 2004-2006 The Regents of The University of Michigan + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are + * met: redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer; + * redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution; + * neither the name of the copyright holders nor the names of its + * contributors may be used to endorse or promote products derived from + * this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + * Authors: Kevin Lim + */ + +#ifndef __CPU_O3_TOURNAMENT_PRED_HH__ +#define __CPU_O3_TOURNAMENT_PRED_HH__ + +#include "cpu/o3/sat_counter.hh" +#include "sim/host.hh" +#include <vector> + +/** + * Implements a tournament branch predictor, hopefully identical to the one + * used in the 21264. It has a local predictor, which uses a local history + * table to index into a table of counters, and a global predictor, which + * uses a global history to index into a table of counters. A choice + * predictor chooses between the two. Only the global history register + * is speculatively updated, the rest are updated upon branches committing + * or misspeculating. + */ +class TournamentBP +{ + public: + /** + * Default branch predictor constructor. + */ + TournamentBP(unsigned localPredictorSize, + unsigned localCtrBits, + unsigned localHistoryTableSize, + unsigned localHistoryBits, + unsigned globalPredictorSize, + unsigned globalHistoryBits, + unsigned globalCtrBits, + unsigned choicePredictorSize, + unsigned choiceCtrBits, + unsigned instShiftAmt); + + /** + * Looks up the given address in the branch predictor and returns + * a true/false value as to whether it is taken. Also creates a + * BPHistory object to store any state it will need on squash/update. + * @param branch_addr The address of the branch to look up. + * @param bp_history Pointer that will be set to the BPHistory object. + * @return Whether or not the branch is taken. + */ + bool lookup(Addr &branch_addr, void * &bp_history); + + /** + * Records that there was an unconditional branch, and modifies + * the bp history to point to an object that has the previous + * global history stored in it. + * @param bp_history Pointer that will be set to the BPHistory object. + */ + void uncondBr(void * &bp_history); + + /** + * Updates the branch predictor with the actual result of a branch. + * @param branch_addr The address of the branch to update. + * @param taken Whether or not the branch was taken. + * @param bp_history Pointer to the BPHistory object that was created + * when the branch was predicted. + */ + void update(Addr &branch_addr, bool taken, void *bp_history); + + /** + * Restores the global branch history on a squash. + * @param bp_history Pointer to the BPHistory object that has the + * previous global branch history in it. + */ + void squash(void *bp_history); + + /** Returns the global history. */ + inline unsigned readGlobalHist() { return globalHistory; } + + private: + /** + * Returns if the branch should be taken or not, given a counter + * value. + * @param count The counter value. + */ + inline bool getPrediction(uint8_t &count); + + /** + * Returns the local history index, given a branch address. + * @param branch_addr The branch's PC address. + */ + inline unsigned calcLocHistIdx(Addr &branch_addr); + + /** Updates global history as taken. */ + inline void updateGlobalHistTaken(); + + /** Updates global history as not taken. */ + inline void updateGlobalHistNotTaken(); + + /** + * Updates local histories as taken. + * @param local_history_idx The local history table entry that + * will be updated. + */ + inline void updateLocalHistTaken(unsigned local_history_idx); + + /** + * Updates local histories as not taken. + * @param local_history_idx The local history table entry that + * will be updated. + */ + inline void updateLocalHistNotTaken(unsigned local_history_idx); + + /** + * The branch history information that is created upon predicting + * a branch. It will be passed back upon updating and squashing, + * when the BP can use this information to update/restore its + * state properly. + */ + struct BPHistory { +#ifdef DEBUG + BPHistory() + { newCount++; } + ~BPHistory() + { newCount--; } + + static int newCount; +#endif + unsigned globalHistory; + bool localPredTaken; + bool globalPredTaken; + bool globalUsed; + }; + + /** Local counters. */ + std::vector<SatCounter> localCtrs; + + /** Size of the local predictor. */ + unsigned localPredictorSize; + + /** Mask to get the proper index bits into the predictor. */ + unsigned localPredictorMask; + + /** Number of bits of the local predictor's counters. */ + unsigned localCtrBits; + + /** Array of local history table entries. */ + std::vector<unsigned> localHistoryTable; + + /** Size of the local history table. */ + unsigned localHistoryTableSize; + + /** Number of bits for each entry of the local history table. + * @todo Doesn't this come from the size of the local predictor? + */ + unsigned localHistoryBits; + + /** Mask to get the proper local history. */ + unsigned localHistoryMask; + + /** Array of counters that make up the global predictor. */ + std::vector<SatCounter> globalCtrs; + + /** Size of the global predictor. */ + unsigned globalPredictorSize; + + /** Number of bits of the global predictor's counters. */ + unsigned globalCtrBits; + + /** Global history register. */ + unsigned globalHistory; + + /** Number of bits for the global history. */ + unsigned globalHistoryBits; + + /** Mask to get the proper global history. */ + unsigned globalHistoryMask; + + /** Array of counters that make up the choice predictor. */ + std::vector<SatCounter> choiceCtrs; + + /** Size of the choice predictor (identical to the global predictor). */ + unsigned choicePredictorSize; + + /** Number of bits of the choice predictor's counters. */ + unsigned choiceCtrBits; + + /** Number of bits to shift the instruction over to get rid of the word + * offset. + */ + unsigned instShiftAmt; + + /** Threshold for the counter value; above the threshold is taken, + * equal to or below the threshold is not taken. + */ + unsigned threshold; +}; + +#endif // __CPU_O3_TOURNAMENT_PRED_HH__ |