Put back in SimpleCPU changes and Coherence Timing Bus changes

Small fixes to read() in simpleCPU and small fixes to cache_impl.hh
and to simple_mem_bank to deal with writeInv from DMA

--HG--
extra : convert_revision : db24028c34b7a535aa0db55b43bad1d3d75cd258

4 files changed, 97 insertions, 25 deletions

diff --git a/cpu/memtest/memtest.cc b/cpu/memtest/memtest.cc
index 6584a62ba..e967c79da 100644
--- a/cpu/memtest/memtest.cc
+++ b/cpu/memtest/memtest.cc
@@ -28,9 +28,10 @@
 
 // FIX ME: make trackBlkAddr use blocksize from actual cache, not hard coded
 
-#include <string>
-#include <sstream>
 #include <iomanip>
+#include <set>
+#include <sstream>
+#include <string>
 #include <vector>
 
 #include "base/misc.hh"
@@ -44,6 +45,8 @@
 
 using namespace std;
 
+int TESTER_ALLOCATOR=0;
+
 MemTest::MemTest(const string &name,
                  MemInterface *_cache_interface,
                  FunctionalMemory *main_mem,
@@ -111,6 +114,8 @@ MemTest::MemTest(const string &name,
     noResponseCycles = 0;
     numReads = 0;
     tickEvent.schedule(0);
+
+    id = TESTER_ALLOCATOR++;
 }
 
 static void
@@ -127,6 +132,11 @@ printData(ostream &os, uint8_t *data, int nbytes)
 void
 MemTest::completeRequest(MemReqPtr &req, uint8_t *data)
 {
+    //Remove the address from the list of outstanding
+    std::set<unsigned>::iterator removeAddr = outstandingAddrs.find(req->paddr);
+    assert(removeAddr != outstandingAddrs.end());
+    outstandingAddrs.erase(removeAddr);
+
     switch (req->cmd) {
       case Read:
         if (memcmp(req->data, data, req->size) != 0) {
@@ -158,6 +168,10 @@ MemTest::completeRequest(MemReqPtr &req, uint8_t *data)
         break;
 
       case Copy:
+        //Also remove dest from outstanding list
+        removeAddr = outstandingAddrs.find(req->dest);
+        assert(removeAddr != outstandingAddrs.end());
+        outstandingAddrs.erase(removeAddr);
         numCopiesStat++;
         break;
 
@@ -212,7 +226,7 @@ MemTest::tick()
     if (!tickEvent.scheduled())
         tickEvent.schedule(curTick + 1);
 
-    if (++noResponseCycles >= 5000) {
+    if (++noResponseCycles >= 500000) {
         cerr << name() << ": deadlocked at cycle " << curTick << endl;
         fatal("");
     }
@@ -232,6 +246,16 @@ MemTest::tick()
     unsigned source_align = rand() % 100;
     unsigned dest_align = rand() % 100;
 
+    //If we aren't doing copies, use id as offset, and do a false sharing
+    //mem tester
+    if (percentCopies == 0) {
+        //We can eliminate the lower bits of the offset, and then use the id
+        //to offset within the blks
+        offset1 &= ~63; //Not the low order bits
+        offset1 += id;
+        access_size = 0;
+    }
+
     MemReqPtr req = new MemReq();
 
     if (cacheable < percentUncacheable) {
@@ -251,6 +275,13 @@ MemTest::tick()
 
     if (cmd < percentReads) {
         // read
+
+        //For now we only allow one outstanding request per addreess per tester
+        //This means we assume CPU does write forwarding to reads that alias something
+        //in the cpu store buffer.
+        if (outstandingAddrs.find(req->paddr) != outstandingAddrs.end()) return;
+        else outstandingAddrs.insert(req->paddr);
+
         req->cmd = Read;
         uint8_t *result = new uint8_t[8];
         checkMem->access(Read, req->paddr, result, req->size);
@@ -273,6 +304,13 @@ MemTest::tick()
         }
     } else if (cmd < (100 - percentCopies)){
         // write
+
+        //For now we only allow one outstanding request per addreess per tester
+        //This means we assume CPU does write forwarding to reads that alias something
+        //in the cpu store buffer.
+        if (outstandingAddrs.find(req->paddr) != outstandingAddrs.end()) return;
+        else outstandingAddrs.insert(req->paddr);
+
         req->cmd = Write;
         memcpy(req->data, &data, req->size);
         checkMem->access(Write, req->paddr, req->data, req->size);
@@ -298,6 +336,11 @@ MemTest::tick()
         // copy
         Addr source = ((base) ? baseAddr1 : baseAddr2) + offset1;
         Addr dest = ((base) ? baseAddr2 : baseAddr1) + offset2;
+        if (outstandingAddrs.find(source) != outstandingAddrs.end()) return;
+        else outstandingAddrs.insert(source);
+        if (outstandingAddrs.find(dest) != outstandingAddrs.end()) return;
+        else outstandingAddrs.insert(dest);
+
         if (source_align >= percentSourceUnaligned) {
             source = blockAddr(source);
         }
diff --git a/cpu/memtest/memtest.hh b/cpu/memtest/memtest.hh
index 72e0709d9..43b17a713 100644
--- a/cpu/memtest/memtest.hh
+++ b/cpu/memtest/memtest.hh
@@ -29,13 +29,14 @@
 #ifndef __MEMTEST_HH__
 #define __MEMTEST_HH__
 
-#include "sim/sim_object.hh"
-#include "mem/mem_interface.hh"
-#include "mem/functional_mem/functional_memory.hh"
-#include "cpu/base_cpu.hh"
-#include "cpu/exec_context.hh"
+#include <set>
 
 #include "base/statistics.hh"
+#include "cpu/base_cpu.hh"
+#include "cpu/exec_context.hh"
+#include "mem/functional_mem/functional_memory.hh"
+#include "mem/mem_interface.hh"
+#include "sim/sim_object.hh"
 #include "sim/stats.hh"
 
 class MemTest : public BaseCPU
@@ -87,6 +88,10 @@ class MemTest : public BaseCPU
     unsigned percentCopies;	// target percentage of copy accesses
     unsigned percentUncacheable;
 
+    int id;
+
+    std::set<unsigned> outstandingAddrs;
+
     unsigned blockSize;
 
     Addr blockAddrMask;
diff --git a/cpu/simple_cpu/simple_cpu.cc b/cpu/simple_cpu/simple_cpu.cc
index d48f93663..9f4f821d4 100644
--- a/cpu/simple_cpu/simple_cpu.cc
+++ b/cpu/simple_cpu/simple_cpu.cc
@@ -414,21 +414,22 @@ template <class T>
 Fault
 SimpleCPU::read(Addr addr, T &data, unsigned flags)
 {
+    if (status() == DcacheMissStall) {
+        Fault fault = xc->read(memReq,data);
+
+        if (traceData) {
+            traceData->setAddr(addr);
+            if (fault == No_Fault)
+                traceData->setData(data);
+        }
+        return fault;
+    }
+
     memReq->reset(addr, sizeof(T), flags);
 
     // translate to physical address
     Fault fault = xc->translateDataReadReq(memReq);
 
-    // do functional access
-    if (fault == No_Fault)
-        fault = xc->read(memReq, data);
-
-    if (traceData) {
-        traceData->setAddr(addr);
-        if (fault == No_Fault)
-            traceData->setData(data);
-    }
-
     // if we have a cache, do cache access too
     if (fault == No_Fault && dcacheInterface) {
         memReq->cmd = Read;
@@ -444,6 +445,24 @@ SimpleCPU::read(Addr addr, T &data, unsigned flags)
             lastDcacheStall = curTick;
             unscheduleTickEvent();
             _status = DcacheMissStall;
+        } else {
+            // do functional access
+            fault = xc->read(memReq, data);
+
+            if (traceData) {
+                traceData->setAddr(addr);
+                if (fault == No_Fault)
+                    traceData->setData(data);
+            }
+        }
+    } else if(fault == No_Fault) {
+        // do functional access
+        fault = xc->read(memReq, data);
+
+        if (traceData) {
+            traceData->setAddr(addr);
+            if (fault == No_Fault)
+                traceData->setData(data);
         }
     }
 
@@ -605,6 +624,9 @@ SimpleCPU::processCacheCompletion()
         scheduleTickEvent(1);
         break;
       case DcacheMissStall:
+        if (memReq->cmd.isRead()) {
+            curStaticInst->execute(this,traceData);
+        }
         dcacheStallCycles += curTick - lastDcacheStall;
         _status = Running;
         scheduleTickEvent(1);
@@ -750,10 +772,10 @@ SimpleCPU::tick()
         comInstEventQueue[0]->serviceEvents(numInst);
 
         // decode the instruction
-    inst = htoa(inst);
-        StaticInstPtr<TheISA> si(inst);
+        inst = htoa(inst);
+        curStaticInst = StaticInst<TheISA>::decode(inst);
 
-        traceData = Trace::getInstRecord(curTick, xc, this, si,
+        traceData = Trace::getInstRecord(curTick, xc, this, curStaticInst,
                                          xc->regs.pc);
 
 #ifdef FULL_SYSTEM
@@ -762,18 +784,18 @@ SimpleCPU::tick()
 
         xc->func_exe_inst++;
 
-        fault = si->execute(this, traceData);
+        fault = curStaticInst->execute(this, traceData);
 
 #ifdef FULL_SYSTEM
         if (xc->fnbin)
-            xc->execute(si.get());
+            xc->execute(curStaticInst.get());
 #endif
 
-        if (si->isMemRef()) {
+        if (curStaticInst->isMemRef()) {
             numMemRefs++;
         }
 
-        if (si->isLoad()) {
+        if (curStaticInst->isLoad()) {
             ++numLoad;
             comLoadEventQueue[0]->serviceEvents(numLoad);
         }
diff --git a/cpu/simple_cpu/simple_cpu.hh b/cpu/simple_cpu/simple_cpu.hh
index 341a0da23..8104d73a4 100644
--- a/cpu/simple_cpu/simple_cpu.hh
+++ b/cpu/simple_cpu/simple_cpu.hh
@@ -184,6 +184,8 @@ class SimpleCPU : public BaseCPU
     // Refcounted pointer to the one memory request.
     MemReqPtr memReq;
 
+    StaticInstPtr<TheISA> curStaticInst;
+
     class CacheCompletionEvent : public Event
     {
       private: