ruby: improved support for functional accesses

This patch adds support to different entities in the ruby memory system
for more reliable functional read/write accesses. Only the simple network
has been augmented as of now. Later on Garnet will also support functional
accesses.
The patch adds functional access code to all the different types of messages
that protocols can send around. These messages are functionally accessed
by going through the buffers maintained by the network entities.
The patch also rectifies some of the bugs found in coherence protocols while
testing the patch.

With this patch applied, functional writes always succeed. But functional
reads can still fail.

1 files changed, 4 insertions, 0 deletions

diff --git a/src/mem/protocol/Network_test-msg.sm b/src/mem/protocol/Network_test-msg.sm
index 6492024d8..9e21d39bb 100644
--- a/src/mem/protocol/Network_test-msg.sm
+++ b/src/mem/protocol/Network_test-msg.sm
@@ -40,4 +40,8 @@ structure(RequestMsg, desc="...", interface="NetworkMessage") {
   NetDest Destination,             desc="Multicast destination mask";
   DataBlock DataBlk,           desc="data for the cache line";
   MessageSizeType MessageSize, desc="size category of the message";
+
+  void functionalWrite(Packet *pkt) {
+    error("Network test does not support functional accesses!");
+  }
 }