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-rw-r--r--src/mem/cache/cache_impl.hh12
-rw-r--r--src/mem/cache/mshr.cc17
2 files changed, 24 insertions, 5 deletions
diff --git a/src/mem/cache/cache_impl.hh b/src/mem/cache/cache_impl.hh
index d36195fe9..734ca826c 100644
--- a/src/mem/cache/cache_impl.hh
+++ b/src/mem/cache/cache_impl.hh
@@ -1713,8 +1713,16 @@ Cache::handleSnoop(PacketPtr pkt, CacheBlk *blk, bool is_timing,
if (!respond && is_timing && is_deferred) {
// if it's a deferred timing snoop then we've made a copy of
- // the packet, and so if we're not using that copy to respond
- // then we need to delete it here.
+ // both the request and the packet, and so if we're not using
+ // those copies to respond and delete them here
+ DPRINTF(Cache, "Deleting pkt %p and request %p for cmd %s addr: %p\n",
+ pkt, pkt->req, pkt->cmdString(), pkt->getAddr());
+
+ // the packets needs a response (just not from us), so we also
+ // need to delete the request and not rely on the packet
+ // destructor
+ assert(pkt->needsResponse());
+ delete pkt->req;
delete pkt;
}
diff --git a/src/mem/cache/mshr.cc b/src/mem/cache/mshr.cc
index c59fa0020..78900ed4e 100644
--- a/src/mem/cache/mshr.cc
+++ b/src/mem/cache/mshr.cc
@@ -365,17 +365,28 @@ MSHR::handleSnoop(PacketPtr pkt, Counter _order)
// Clear flags and also allocate new data as the original
// packet data storage may have been deleted by the time we
// get to send this packet.
- PacketPtr cp_pkt = new Packet(pkt, true, true);
- targets.add(cp_pkt, curTick(), _order, Target::FromSnoop,
- downstreamPending && targets.needsExclusive);
+ PacketPtr cp_pkt = nullptr;
if (isPendingDirty()) {
+ // Case 1: The new packet will need to get the response from the
+ // MSHR already queued up here
+ cp_pkt = new Packet(pkt, true, true);
pkt->assertMemInhibit();
// in the case of an uncacheable request there is no need
// to set the exclusive flag, but since the recipient does
// not care there is no harm in doing so
pkt->setSupplyExclusive();
+ } else {
+ // Case 2: We only need to buffer the packet for information
+ // purposes; the original request can proceed without waiting
+ // => Create a copy of the request, as that may get deallocated as
+ // well
+ cp_pkt = new Packet(new Request(*pkt->req), pkt->cmd);
+ DPRINTF(Cache, "Copying packet %p -> %p and request %p -> %p\n",
+ pkt, cp_pkt, pkt->req, cp_pkt->req);
}
+ targets.add(cp_pkt, curTick(), _order, Target::FromSnoop,
+ downstreamPending && targets.needsExclusive);
if (pkt->needsExclusive()) {
// This transaction will take away our pending copy