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-rw-r--r--src/mem/cache/miss/mshr_queue.cc269
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diff --git a/src/mem/cache/miss/mshr_queue.cc b/src/mem/cache/miss/mshr_queue.cc
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+/*
+ * Copyright (c) 2003-2005 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: Erik Hallnor
+ */
+
+/** @file
+ * Definition of the MSHRQueue.
+ */
+
+#include "mem/cache/miss/mshr_queue.hh"
+#include "sim/eventq.hh"
+
+using namespace std;
+
+MSHRQueue::MSHRQueue(int num_mshrs, int reserve)
+ : numMSHRs(num_mshrs + reserve - 1), numReserve(reserve)
+{
+ allocated = 0;
+ inServiceMSHRs = 0;
+ allocatedTargets = 0;
+ registers = new MSHR[numMSHRs];
+ for (int i = 0; i < numMSHRs; ++i) {
+ freeList.push_back(&registers[i]);
+ }
+}
+
+MSHRQueue::~MSHRQueue()
+{
+ delete [] registers;
+}
+
+MSHR*
+MSHRQueue::findMatch(Addr addr, int asid) const
+{
+ MSHR::ConstIterator i = allocatedList.begin();
+ MSHR::ConstIterator end = allocatedList.end();
+ for (; i != end; ++i) {
+ MSHR *mshr = *i;
+ if (mshr->addr == addr) {
+ return mshr;
+ }
+ }
+ return NULL;
+}
+
+bool
+MSHRQueue::findMatches(Addr addr, int asid, vector<MSHR*>& matches) const
+{
+ // Need an empty vector
+ assert(matches.empty());
+ bool retval = false;
+ MSHR::ConstIterator i = allocatedList.begin();
+ MSHR::ConstIterator end = allocatedList.end();
+ for (; i != end; ++i) {
+ MSHR *mshr = *i;
+ if (mshr->addr == addr) {
+ retval = true;
+ matches.push_back(mshr);
+ }
+ }
+ return retval;
+
+}
+
+MSHR*
+MSHRQueue::findPending(Packet * &pkt) const
+{
+ MSHR::ConstIterator i = pendingList.begin();
+ MSHR::ConstIterator end = pendingList.end();
+ for (; i != end; ++i) {
+ MSHR *mshr = *i;
+ if (mshr->addr < pkt->getAddr()) {
+ if (mshr->addr + mshr->pkt->getSize() > pkt->getAddr()) {
+ return mshr;
+ }
+ } else {
+ if (pkt->getAddr() + pkt->getSize() > mshr->addr) {
+ return mshr;
+ }
+ }
+
+ //need to check destination address for copies.
+ //TEMP NOT DOING COPIES
+#if 0
+ if (mshr->pkt->cmd == Copy) {
+ Addr dest = mshr->pkt->dest;
+ if (dest < pkt->addr) {
+ if (dest + mshr->pkt->size > pkt->addr) {
+ return mshr;
+ }
+ } else {
+ if (pkt->addr + pkt->size > dest) {
+ return mshr;
+ }
+ }
+ }
+#endif
+ }
+ return NULL;
+}
+
+MSHR*
+MSHRQueue::allocate(Packet * &pkt, int size)
+{
+ Addr aligned_addr = pkt->getAddr() & ~((Addr)size - 1);
+ MSHR *mshr = freeList.front();
+ assert(mshr->getNumTargets() == 0);
+ freeList.pop_front();
+
+ if (!pkt->needsResponse()) {
+ mshr->allocateAsBuffer(pkt);
+ } else {
+ assert(size !=0);
+ mshr->allocate(pkt->cmd, aligned_addr, pkt->req->getAsid(), size, pkt);
+ allocatedTargets += 1;
+ }
+ mshr->allocIter = allocatedList.insert(allocatedList.end(), mshr);
+ mshr->readyIter = pendingList.insert(pendingList.end(), mshr);
+
+ allocated += 1;
+ return mshr;
+}
+
+MSHR*
+MSHRQueue::allocateFetch(Addr addr, int asid, int size, Packet * &target)
+{
+ MSHR *mshr = freeList.front();
+ assert(mshr->getNumTargets() == 0);
+ freeList.pop_front();
+ mshr->allocate(Packet::ReadReq, addr, asid, size, target);
+ mshr->allocIter = allocatedList.insert(allocatedList.end(), mshr);
+ mshr->readyIter = pendingList.insert(pendingList.end(), mshr);
+
+ allocated += 1;
+ return mshr;
+}
+
+MSHR*
+MSHRQueue::allocateTargetList(Addr addr, int asid, int size)
+{
+ MSHR *mshr = freeList.front();
+ assert(mshr->getNumTargets() == 0);
+ freeList.pop_front();
+ Packet * dummy;
+ mshr->allocate(Packet::ReadReq, addr, asid, size, dummy);
+ mshr->allocIter = allocatedList.insert(allocatedList.end(), mshr);
+ mshr->inService = true;
+ ++inServiceMSHRs;
+ ++allocated;
+ return mshr;
+}
+
+
+void
+MSHRQueue::deallocate(MSHR* mshr)
+{
+ deallocateOne(mshr);
+}
+
+MSHR::Iterator
+MSHRQueue::deallocateOne(MSHR* mshr)
+{
+ MSHR::Iterator retval = allocatedList.erase(mshr->allocIter);
+ freeList.push_front(mshr);
+ allocated--;
+ allocatedTargets -= mshr->getNumTargets();
+ if (mshr->inService) {
+ inServiceMSHRs--;
+ } else {
+ pendingList.erase(mshr->readyIter);
+ }
+ mshr->deallocate();
+ return retval;
+}
+
+void
+MSHRQueue::moveToFront(MSHR *mshr)
+{
+ if (!mshr->inService) {
+ assert(mshr == *(mshr->readyIter));
+ pendingList.erase(mshr->readyIter);
+ mshr->readyIter = pendingList.insert(pendingList.begin(), mshr);
+ }
+}
+
+void
+MSHRQueue::markInService(MSHR* mshr)
+{
+ //assert(mshr == pendingList.front());
+ if (!mshr->pkt->needsResponse()) {
+ assert(mshr->getNumTargets() == 0);
+ deallocate(mshr);
+ return;
+ }
+ mshr->inService = true;
+ pendingList.erase(mshr->readyIter);
+ mshr->readyIter = NULL;
+ inServiceMSHRs += 1;
+ //pendingList.pop_front();
+}
+
+void
+MSHRQueue::markPending(MSHR* mshr, Packet::Command cmd)
+{
+ assert(mshr->readyIter == NULL);
+ mshr->pkt->cmd = cmd;
+ mshr->pkt->flags &= ~SATISFIED;
+ mshr->inService = false;
+ --inServiceMSHRs;
+ /**
+ * @ todo might want to add rerequests to front of pending list for
+ * performance.
+ */
+ mshr->readyIter = pendingList.insert(pendingList.end(), mshr);
+}
+
+void
+MSHRQueue::squash(int threadNum)
+{
+ MSHR::Iterator i = allocatedList.begin();
+ MSHR::Iterator end = allocatedList.end();
+ for (; i != end;) {
+ MSHR *mshr = *i;
+ if (mshr->threadNum == threadNum) {
+ while (mshr->hasTargets()) {
+ Packet * target = mshr->getTarget();
+ mshr->popTarget();
+
+ assert(target->req->getThreadNum() == threadNum);
+ target = NULL;
+ }
+ assert(!mshr->hasTargets());
+ assert(mshr->ntargets==0);
+ if (!mshr->inService) {
+ i = deallocateOne(mshr);
+ } else {
+ //mshr->pkt->flags &= ~CACHE_LINE_FILL;
+ ++i;
+ }
+ } else {
+ ++i;
+ }
+ }
+}
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