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authorRon Dreslinski <rdreslin@umich.edu>2006-10-09 20:18:00 -0400
committerRon Dreslinski <rdreslin@umich.edu>2006-10-09 20:18:00 -0400
commitec8a437b2c11453e9b94978b0c18a31f12ec04ac (patch)
treefc55b2909d7a5c3140f9bd2eafc16a9ec13318df /src
parent9356bcda7b50ae8916eee2dfbad84ed3ea873c1e (diff)
downloadgem5-ec8a437b2c11453e9b94978b0c18a31f12ec04ac.tar.xz
Handle NACK's that occur from devices on the same bus.
Not fully implemented yet, but good enough for single level cache coherence src/mem/packet.hh: Add a bit to distinguish invalidates and upgrades --HG-- extra : convert_revision : 5bf50d535857cea37fbdaf7993915d1332cb757e
Diffstat (limited to 'src')
-rw-r--r--src/mem/cache/cache_impl.hh14
-rw-r--r--src/mem/packet.hh5
2 files changed, 13 insertions, 6 deletions
diff --git a/src/mem/cache/cache_impl.hh b/src/mem/cache/cache_impl.hh
index c3c1c0881..5c12075cd 100644
--- a/src/mem/cache/cache_impl.hh
+++ b/src/mem/cache/cache_impl.hh
@@ -287,13 +287,17 @@ template<class TagStore, class Buffering, class Coherence>
void
Cache<TagStore,Buffering,Coherence>::sendResult(PacketPtr &pkt, MSHR* mshr, bool success)
{
- if (success) {
+ if (success && !(pkt->flags & NACKED_LINE)) {
missQueue->markInService(pkt, mshr);
//Temp Hack for UPGRADES
if (pkt->cmd == Packet::UpgradeReq) {
+ pkt->flags &= ~CACHE_LINE_FILL;
handleResponse(pkt);
}
} else if (pkt && !pkt->req->isUncacheable()) {
+ pkt->flags &= ~NACKED_LINE;
+ pkt->flags &= ~SATISFIED;
+ pkt->flags &= ~SNOOP_COMMIT;
missQueue->restoreOrigCmd(pkt);
}
}
@@ -305,8 +309,9 @@ Cache<TagStore,Buffering,Coherence>::handleResponse(Packet * &pkt)
BlkType *blk = NULL;
if (pkt->senderState) {
if (pkt->result == Packet::Nacked) {
- pkt->reinitFromRequest();
- panic("Unimplemented NACK of packet\n");
+ //pkt->reinitFromRequest();
+ warn("NACKs from devices not connected to the same bus not implemented\n");
+ return;
}
if (pkt->result == Packet::BadAddress) {
//Make the response a Bad address and send it
@@ -397,7 +402,8 @@ Cache<TagStore,Buffering,Coherence>::snoop(Packet * &pkt)
assert(!(pkt->flags & SATISFIED));
pkt->flags |= SATISFIED;
pkt->flags |= NACKED_LINE;
- respondToSnoop(pkt, curTick + hitLatency);
+ warn("NACKs from devices not connected to the same bus not implemented\n");
+ //respondToSnoop(pkt, curTick + hitLatency);
return;
}
else {
diff --git a/src/mem/packet.hh b/src/mem/packet.hh
index 56c4caffe..e8cbfd10e 100644
--- a/src/mem/packet.hh
+++ b/src/mem/packet.hh
@@ -174,7 +174,8 @@ class Packet
IsResponse = 1 << 5,
NeedsResponse = 1 << 6,
IsSWPrefetch = 1 << 7,
- IsHWPrefetch = 1 << 8
+ IsHWPrefetch = 1 << 8,
+ IsUpgrade = 1 << 9
};
public:
@@ -194,7 +195,7 @@ class Packet
HardPFResp = IsRead | IsResponse | IsHWPrefetch | NeedsResponse,
InvalidateReq = IsInvalidate | IsRequest,
WriteInvalidateReq = IsWrite | IsInvalidate | IsRequest,
- UpgradeReq = IsInvalidate | IsRequest,
+ UpgradeReq = IsInvalidate | IsRequest | IsUpgrade,
ReadExReq = IsRead | IsInvalidate | IsRequest | NeedsResponse,
ReadExResp = IsRead | IsInvalidate | IsResponse | NeedsResponse
};