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authorRon Dreslinski <rdreslin@umich.edu>2006-10-05 21:10:03 -0400
committerRon Dreslinski <rdreslin@umich.edu>2006-10-05 21:10:03 -0400
commit45f881a4ced25105267799432c0f526400f0ba9e (patch)
tree3d791c2408be2f1b9c1d349a5dc06ffdb4850b4a /src/mem/cache/base_cache.hh
parent868d112578467273a50de3bf926bf0d280eebcd3 (diff)
downloadgem5-45f881a4ced25105267799432c0f526400f0ba9e.tar.xz
First pass at snooping stuff that compiles and doesn't break.
Still need: -Handle NACK's on the recieve side -Distinguish top level caches -Handle repsonses from caches failing the fast path -Handle BusError and propogate it -Fix the invalidate packet associated with snooping in the cache src/mem/bus.cc: Make sure to snoop on functional accesses src/mem/cache/base_cache.cc: Wait to make a request into a response until it is ready to be issued src/mem/cache/base_cache.hh: Support range changes for snoops Set up snoop responses for cache->cache transfers src/mem/cache/cache_impl.hh: Only access the cache if it wasn't satisfied by cache->cache transfer Handle snoop phases (detect block, then snoop) Fix functional access to work properly (still need to fix snoop path for functional accesses) --HG-- extra : convert_revision : 4c25f11d7a996c1f56f4f7b55dde87a344e5fdf8
Diffstat (limited to 'src/mem/cache/base_cache.hh')
-rw-r--r--src/mem/cache/base_cache.hh42
1 files changed, 32 insertions, 10 deletions
diff --git a/src/mem/cache/base_cache.hh b/src/mem/cache/base_cache.hh
index 069dbab58..49999dcb4 100644
--- a/src/mem/cache/base_cache.hh
+++ b/src/mem/cache/base_cache.hh
@@ -127,6 +127,8 @@ class BaseCache : public MemObject
CachePort *cpuSidePort;
CachePort *memSidePort;
+ bool snoopRangesSent;
+
public:
virtual Port *getPort(const std::string &if_name, int idx = -1);
@@ -149,17 +151,22 @@ class BaseCache : public MemObject
void recvStatusChange(Port::Status status, bool isCpuSide)
{
- if (status == Port::RangeChange)
- {
- if (!isCpuSide)
- {
+ if (status == Port::RangeChange){
+ if (!isCpuSide) {
cpuSidePort->sendStatusChange(Port::RangeChange);
+ if (topLevelCache && !snoopRangesSent) {
+ snoopRangesSent = true;
+ memSidePort->sendStatusChange(Port::RangeChange);
+ }
}
- else
- {
+ else {
memSidePort->sendStatusChange(Port::RangeChange);
}
}
+ else if (status == Port::SnoopSquash) {
+ assert(snoopPhase2);
+ snoopPhase2 = false;
+ }
}
virtual Packet *getPacket()
@@ -205,6 +212,10 @@ class BaseCache : public MemObject
/** True if this cache is connected to the CPU. */
bool topLevelCache;
+
+ /** True if we are now in phase 2 of the snoop process. */
+ bool snoopPhase2;
+
/** Stores time the cache blocked for statistics. */
Tick blockedCycle;
@@ -332,6 +343,7 @@ class BaseCache : public MemObject
//Start ports at null if more than one is created we should panic
cpuSidePort = NULL;
memSidePort = NULL;
+ snoopRangesSent = false;
}
virtual void init();
@@ -519,8 +531,6 @@ class BaseCache : public MemObject
if (!pkt->req->isUncacheable()) {
missLatency[pkt->cmdToIndex()][pkt->req->getThreadNum()] += time - pkt->time;
}
- pkt->makeTimingResponse();
- pkt->result = Packet::Success;
CacheEvent *reqCpu = new CacheEvent(cpuSidePort, pkt);
reqCpu->schedule(time);
}
@@ -529,10 +539,12 @@ class BaseCache : public MemObject
* Suppliess the data if cache to cache transfers are enabled.
* @param pkt The bus transaction to fulfill.
*/
- void respondToSnoop(Packet *pkt)
+ void respondToSnoop(Packet *pkt, Tick time)
{
- assert("Implement\n" && 0);
+// assert("Implement\n" && 0);
// mi->respond(pkt,curTick + hitLatency);
+ CacheEvent *reqMem = new CacheEvent(memSidePort, pkt);
+ reqMem->schedule(time);
}
/**
@@ -551,6 +563,16 @@ class BaseCache : public MemObject
else
{
//This is where snoops get updated
+ AddrRangeList dummy;
+ if (!topLevelCache)
+ {
+ cpuSidePort->getPeerAddressRanges(dummy, snoop);
+ }
+ else
+ {
+ snoop.push_back(RangeSize(0,-1));
+ }
+
return;
}
}