Fixes to get single level uni-coherence to work.

Now to try L2 caches in FS.

src/mem/cache/base_cache.hh:
    Fix uni-coherence for atomic accesses in coherence protocol access to port
src/mem/cache/cache_impl.hh:
    Properly handle uni-coherence
src/mem/cache/coherence/simple_coherence.hh:
    Properly forward invalidates (not done for MSI+ protocols (assumed top level for now)
src/mem/cache/coherence/uni_coherence.cc:
src/mem/cache/coherence/uni_coherence.hh:
    Properly forward invalidates in atomic/timing uni-coherence

--HG--
extra : convert_revision : f0f11315e8e7f32c19d92287f6f9c27b079c96f7

src/mem/cache/base_cache.hh

@@ -128,8 +128,10 @@ class BaseCache : public MemObject
         const char *description();
     };
 
-  protected:
+  public: //Made public so coherence can get at it.
     CachePort *cpuSidePort;
+
+  protected:
     CachePort *memSidePort;
 
     bool snoopRangesSent;

src/mem/cache/cache_impl.hh

@@ -373,10 +373,15 @@ Cache<TagStore,Buffering,Coherence>::snoop(Packet * &pkt)
         //Revisit this for multi level coherence
         return;
     }
+
+    //Send a timing (true) invalidate up if the protocol calls for it
+    coherence->propogateInvalidate(pkt, true);
+
     Addr blk_addr = pkt->getAddr() & ~(Addr(blkSize-1));
     BlkType *blk = tags->findBlock(pkt);
     MSHR *mshr = missQueue->findMSHR(blk_addr);
-    if (coherence->hasProtocol()) { //@todo Move this into handle bus req
+    if (coherence->hasProtocol() || pkt->isInvalidate()) {
+        //@todo Move this into handle bus req
         //If we find an mshr, and it is in service, we need to NACK or
         //invalidate
         if (mshr) {
@@ -626,6 +631,7 @@ Cache<TagStore,Buffering,Coherence>::probe(Packet * &pkt, bool update,
 
             }
         }
+        return 0;
     } else if (!blk) {
         // update the cache state and statistics
         if (mshr || !writes.empty()){
@@ -713,24 +719,27 @@ template<class TagStore, class Buffering, class Coherence>
 Tick
 Cache<TagStore,Buffering,Coherence>::snoopProbe(PacketPtr &pkt)
 {
-        Addr blk_addr = pkt->getAddr() & ~(Addr(blkSize-1));
-        BlkType *blk = tags->findBlock(pkt);
-        MSHR *mshr = missQueue->findMSHR(blk_addr);
-        CacheBlk::State new_state = 0;
-        bool satisfy = coherence->handleBusRequest(pkt,blk,mshr, new_state);
-        if (satisfy) {
-            DPRINTF(Cache, "Cache snooped a %s request for addr %x and "
-                    "now supplying data, new state is %i\n",
-                    pkt->cmdString(), blk_addr, new_state);
+    //Send a atomic (false) invalidate up if the protocol calls for it
+    coherence->propogateInvalidate(pkt, true);
+
+    Addr blk_addr = pkt->getAddr() & ~(Addr(blkSize-1));
+    BlkType *blk = tags->findBlock(pkt);
+    MSHR *mshr = missQueue->findMSHR(blk_addr);
+    CacheBlk::State new_state = 0;
+    bool satisfy = coherence->handleBusRequest(pkt,blk,mshr, new_state);
+    if (satisfy) {
+        DPRINTF(Cache, "Cache snooped a %s request for addr %x and "
+                "now supplying data, new state is %i\n",
+                pkt->cmdString(), blk_addr, new_state);
 
             tags->handleSnoop(blk, new_state, pkt);
             return hitLatency;
-        }
-        if (blk)
-            DPRINTF(Cache, "Cache snooped a %s request for addr %x, "
-                    "new state is %i\n",
+    }
+    if (blk)
+        DPRINTF(Cache, "Cache snooped a %s request for addr %x, "
+                "new state is %i\n",
                     pkt->cmdString(), blk_addr, new_state);
-        tags->handleSnoop(blk, new_state);
-        return 0;
+    tags->handleSnoop(blk, new_state);
+    return 0;
 }
 

src/mem/cache/coherence/simple_coherence.hh

@@ -160,6 +160,12 @@ class SimpleCoherence
     bool allowFastWrites() { return false; }
 
     bool hasProtocol() { return true; }
+
+    void propogateInvalidate(Packet *pkt, bool isTiming)
+    {
+        //For now we do nothing, asssumes simple coherence is top level of cache
+        return;
+    }
 };
 
 #endif //__SIMPLE_COHERENCE_HH__

src/mem/cache/coherence/uni_coherence.cc

@@ -76,19 +76,31 @@ UniCoherence::handleBusRequest(Packet * &pkt, CacheBlk *blk, MSHR *mshr,
 {
     new_state = 0;
     if (pkt->isInvalidate()) {
-        DPRINTF(Cache, "snoop inval on blk %x (blk ptr %x)\n",
-                pkt->getAddr(), blk);
-        // Forward to other caches
-        Packet * tmp = new Packet(pkt->req, Packet::InvalidateReq, -1);
-        cshrs.allocate(tmp);
-        cache->setSlaveRequest(Request_Coherence, curTick);
-        if (cshrs.isFull()) {
-            cache->setBlockedForSnoop(Blocked_Coherence);
-        }
-    } else {
-        if (blk) {
-            new_state = blk->status;
-        }
+            DPRINTF(Cache, "snoop inval on blk %x (blk ptr %x)\n",
+                    pkt->getAddr(), blk);
+    }
+    else if (blk) {
+        new_state = blk->status;
     }
     return false;
 }
+
+void
+UniCoherence::propogateInvalidate(Packet *pkt, bool isTiming)
+{
+    if (pkt->isInvalidate()) {
+        if (isTiming) {
+            // Forward to other caches
+            Packet * tmp = new Packet(pkt->req, Packet::InvalidateReq, -1);
+            cshrs.allocate(tmp);
+            cache->setSlaveRequest(Request_Coherence, curTick);
+            if (cshrs.isFull())
+                cache->setBlockedForSnoop(Blocked_Coherence);
+        }
+        else {
+            Packet * tmp = new Packet(pkt->req, Packet::InvalidateReq, -1);
+            cache->cpuSidePort->sendAtomic(tmp);
+            delete tmp;
+        }
+    }
+}

src/mem/cache/coherence/uni_coherence.hh

@@ -139,6 +139,8 @@ class UniCoherence
     bool allowFastWrites() { return true; }
 
     bool hasProtocol() { return false; }
+
+    void propogateInvalidate(Packet *pkt, bool isTiming);
 };
 
 #endif //__UNI_COHERENCE_HH__