Fixes to cache eliminating the assumption that the Packet is still valid after sending out a request.

Still need to rework upgrades into this system, but works for now.

src/mem/cache/base_cache.cc:
    Re order code to be more readable
src/mem/cache/base_cache.hh:
    Be sure to delete the copy on a bus block
src/mem/cache/cache_impl.hh:
    Be sure to remove the copy on a writeback success
src/mem/cache/miss/mshr_queue.cc:
    Demorgans to make it easier to understand
src/mem/tport.cc:
    Delete writebacks

--HG--
extra : convert_revision : 9519fb37b46ead781d340de29bb342a322a6a92e

4 files changed, 36 insertions, 10 deletions

diff --git a/src/mem/cache/base_cache.cc b/src/mem/cache/base_cache.cc
index 30c996d4f..6250b72d4 100644
--- a/src/mem/cache/base_cache.cc
+++ b/src/mem/cache/base_cache.cc
@@ -179,16 +179,23 @@ BaseCache::CachePort::recvRetry()
             return;
         }
         pkt = cache->getPacket();
-        MSHR* mshr = (MSHR*)pkt->senderState;
+        MSHR* mshr = (MSHR*) pkt->senderState;
         //Copy the packet, it may be modified/destroyed elsewhere
         Packet * copyPkt = new Packet(*pkt);
         copyPkt->dataStatic<uint8_t>(pkt->getPtr<uint8_t>());
         mshr->pkt = copyPkt;
+
         bool success = sendTiming(pkt);
         DPRINTF(Cache, "Address %x was %s in sending the timing request\n",
                 pkt->getAddr(), success ? "succesful" : "unsuccesful");
-        cache->sendResult(pkt, mshr, success);
+
         waitingOnRetry = !success;
+        if (waitingOnRetry) {
+            DPRINTF(CachePort, "%s now waiting on a retry\n", name());
+        }
+
+        cache->sendResult(pkt, mshr, success);
+
         if (success && cache->doMasterRequest())
         {
             DPRINTF(CachePort, "%s has more requests\n", name());
@@ -301,10 +308,13 @@ BaseCache::CacheEvent::process()
             bool success = cachePort->sendTiming(pkt);
             DPRINTF(Cache, "Address %x was %s in sending the timing request\n",
                     pkt->getAddr(), success ? "succesful" : "unsuccesful");
-            cachePort->cache->sendResult(pkt, mshr, success);
+
             cachePort->waitingOnRetry = !success;
-            if (cachePort->waitingOnRetry)
+            if (cachePort->waitingOnRetry) {
                 DPRINTF(CachePort, "%s now waiting on a retry\n", cachePort->name());
+            }
+
+            cachePort->cache->sendResult(pkt, mshr, success);
             if (success && cachePort->cache->doMasterRequest())
             {
                 DPRINTF(CachePort, "%s still more MSHR requests to send\n",
diff --git a/src/mem/cache/base_cache.hh b/src/mem/cache/base_cache.hh
index 7a9e57430..8814abb38 100644
--- a/src/mem/cache/base_cache.hh
+++ b/src/mem/cache/base_cache.hh
@@ -525,8 +525,11 @@ class BaseCache : public MemObject
             reqCpu->schedule(time);
         }
         else {
-            if (pkt->cmd == Packet::Writeback) delete pkt->req;
-            delete pkt;
+            if (pkt->cmd != Packet::UpgradeReq)
+            {
+                delete pkt->req;
+                delete pkt;
+            }
         }
     }
 
@@ -545,8 +548,11 @@ class BaseCache : public MemObject
             reqCpu->schedule(time);
         }
         else {
-            if (pkt->cmd == Packet::Writeback) delete pkt->req;
-            delete pkt;
+            if (pkt->cmd != Packet::UpgradeReq)
+            {
+                delete pkt->req;
+                delete pkt;
+            }
         }
     }
 
diff --git a/src/mem/cache/cache_impl.hh b/src/mem/cache/cache_impl.hh
index a64ce4e09..44d7b4895 100644
--- a/src/mem/cache/cache_impl.hh
+++ b/src/mem/cache/cache_impl.hh
@@ -273,9 +273,14 @@ void
 Cache<TagStore,Buffering,Coherence>::sendResult(PacketPtr &pkt, MSHR* mshr, bool success)
 {
     if (success && !(pkt && (pkt->flags & NACKED_LINE))) {
+        if (!mshr->pkt->needsResponse() && !(mshr->pkt->cmd == Packet::UpgradeReq)
+            && (pkt && (pkt->flags & SATISFIED))) {
+            //Writeback, clean up the non copy version of the packet
+            delete pkt;
+        }
         missQueue->markInService(mshr->pkt, mshr);
         //Temp Hack for UPGRADES
-        if (mshr->pkt->cmd == Packet::UpgradeReq) {
+        if (mshr->pkt && mshr->pkt->cmd == Packet::UpgradeReq) {
             assert(pkt);  //Upgrades need to be fixed
             pkt->flags &= ~CACHE_LINE_FILL;
             BlkType *blk = tags->findBlock(pkt);
@@ -295,6 +300,11 @@ Cache<TagStore,Buffering,Coherence>::sendResult(PacketPtr &pkt, MSHR* mshr, bool
         pkt->flags &= ~NACKED_LINE;
         pkt->flags &= ~SATISFIED;
         pkt->flags &= ~SNOOP_COMMIT;
+
+//Rmove copy from mshr
+        delete mshr->pkt;
+        mshr->pkt = pkt;
+
         missQueue->restoreOrigCmd(pkt);
     }
 }
diff --git a/src/mem/cache/miss/mshr_queue.cc b/src/mem/cache/miss/mshr_queue.cc
index 1876a8987..9d2a692cf 100644
--- a/src/mem/cache/miss/mshr_queue.cc
+++ b/src/mem/cache/miss/mshr_queue.cc
@@ -213,7 +213,7 @@ void
 MSHRQueue::markInService(MSHR* mshr)
 {
     //assert(mshr == pendingList.front());
-    if (!(mshr->pkt->needsResponse() || mshr->pkt->cmd == Packet::UpgradeReq)) {
+    if (!mshr->pkt->needsResponse() && !(mshr->pkt->cmd == Packet::UpgradeReq)) {
         assert(mshr->getNumTargets() == 0);
         if ((mshr->pkt->flags & SATISFIED) && (mshr->pkt->cmd == Packet::Writeback)) {
             //Writeback hit, so delete it