From 3be4f4b846f991c98fe1909631996c5b58d52437 Mon Sep 17 00:00:00 2001
From: Andreas Hansson <andreas.hansson@arm.com>
Date: Wed, 3 Sep 2014 07:42:50 -0400
Subject: mem: Fix a bug in the cache port flow control

This patch fixes a bug in the cache port where the retry flag was
reset too early, allowing new requests to arrive before the retry was
actually sent, but with the event already scheduled. This caused a
deadlock in the interactions with the O3 LSQ.

The patche fixes the underlying issue by shifting the resetting of the
flag to be done by the event that also calls sendRetry(). The patch
also tidies up the flow control in recvTimingReq and ensures that we
also check if we already have a retry outstanding.
---
 src/mem/cache/base.hh | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

(limited to 'src/mem/cache/base.hh')

diff --git a/src/mem/cache/base.hh b/src/mem/cache/base.hh
index c1c77cde9..1567aaa62 100644
--- a/src/mem/cache/base.hh
+++ b/src/mem/cache/base.hh
@@ -182,7 +182,10 @@ class BaseCache : public MemObject
 
       private:
 
-        EventWrapper<SlavePort, &SlavePort::sendRetry> sendRetryEvent;
+        void processSendRetry();
+
+        EventWrapper<CacheSlavePort,
+                     &CacheSlavePort::processSendRetry> sendRetryEvent;
 
     };
 
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