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mem: Add support for repopulating the flags of an MSHR TargetList

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This patch adds support for repopulating the flags of an MSHR
TargetList. The added functionality makes it possible to remove
targets from a TargetList without leaving it in an inconsistent state.

Change-Id: I3f7a8e97bfd3e2e49bebad056d11bbfb087aad91
Reviewed-by: Andreas Hansson <andreas.hansson@arm.com>
Reviewed-by: Stephan Diestelhorst <stephan.diestelhorst@arm.com>
This commit is contained in:
Nikos Nikoleris 2016-12-05 16:48:17 -05:00
parent 3d0a537862
commit f7a5de3bec
2 changed files with 36 additions and 3 deletions
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20
src/mem/cache/mshr.cc vendored
View file

@ -74,9 +74,8 @@ MSHR::TargetList::TargetList()
{}
inline void
MSHR::TargetList::add(PacketPtr pkt, Tick readyTime,
Counter order, Target::Source source, bool markPending)
void
MSHR::TargetList::updateFlags(PacketPtr pkt, Target::Source source)
{
if (source != Target::FromSnoop) {
if (pkt->needsWritable()) {
@ -90,7 +89,22 @@ MSHR::TargetList::add(PacketPtr pkt, Tick readyTime,
hasUpgrade = true;
}
}
}
void
MSHR::TargetList::populateFlags()
{
resetFlags();
for (auto& t: *this) {
updateFlags(t.pkt, t.source);
}
}
inline void
MSHR::TargetList::add(PacketPtr pkt, Tick readyTime,
Counter order, Target::Source source, bool markPending)
{
updateFlags(pkt, source);
if (markPending) {
// Iterate over the SenderState stack and see if we find
// an MSHR entry. If we do, set the downstreamPending

19
src/mem/cache/mshr.hh vendored
View file

@ -143,7 +143,26 @@ class MSHR : public QueueEntry, public Printable
bool hasUpgrade;
TargetList();
/**
* Use the provided packet and the source to update the
* flags of this TargetList.
*
* @param pkt Packet considered for the flag update
* @param source Indicates the source of the packet
*/
void updateFlags(PacketPtr pkt, Target::Source source);
void resetFlags() { needsWritable = hasUpgrade = false; }
/**
* Goes through the list of targets and uses them to populate
* the flags of this TargetList. When the function returns the
* flags are consistent with the properties of packets in the
* list.
*/
void populateFlags();
bool isReset() const { return !needsWritable && !hasUpgrade; }
void add(PacketPtr pkt, Tick readyTime, Counter order,
Target::Source source, bool markPending);