From 4f833907812b50e8c6cce761d2f3c1f6fd07ae7b Mon Sep 17 00:00:00 2001
From: Brad Beckmann <Brad.Beckmann@amd.com>
Date: Wed, 6 Jul 2011 18:44:42 -0700
Subject: MOESI_hammer: Fixed uniprocessor DMA bug

---
 src/mem/protocol/MOESI_hammer-cache.sm | 17 ++++++++++++++++-
 src/mem/protocol/MOESI_hammer-dir.sm   | 14 ++++++++++++++
 2 files changed, 30 insertions(+), 1 deletion(-)

(limited to 'src/mem/protocol')

diff --git a/src/mem/protocol/MOESI_hammer-cache.sm b/src/mem/protocol/MOESI_hammer-cache.sm
index edb1587e3..9576ba1af 100644
--- a/src/mem/protocol/MOESI_hammer-cache.sm
+++ b/src/mem/protocol/MOESI_hammer-cache.sm
@@ -545,6 +545,21 @@ machine(L1Cache, "AMD Hammer-like protocol")
     }
   }
 
+  action(b_issueGETXIfMoreThanOne, "bo", desc="Issue GETX") {
+    if (machineCount(MachineType:L1Cache) > 1) {
+      enqueue(requestNetwork_out, RequestMsg, latency=issue_latency) {
+        assert(is_valid(tbe));
+        out_msg.Address := address;
+        out_msg.Type := CoherenceRequestType:GETX;
+        out_msg.Requestor := machineID;
+        out_msg.Destination.add(map_Address_to_Directory(address));
+        out_msg.MessageSize := MessageSizeType:Request_Control;
+        out_msg.InitialRequestTime := get_time();
+      }
+    }
+    tbe.NumPendingMsgs := machineCount(MachineType:L1Cache); // One from each other cache (n-1) plus the memory (+1)
+  }
+
   action(bf_issueGETF, "bf", desc="Issue GETF") {
     enqueue(requestNetwork_out, RequestMsg, latency=issue_latency) {
       assert(is_valid(tbe));
@@ -921,7 +936,7 @@ machine(L1Cache, "AMD Hammer-like protocol")
 
   action(m_decrementNumberOfMessages, "m", desc="Decrement the number of messages for which we're waiting") {
     peek(responseToCache_in, ResponseMsg) {
-      assert(in_msg.Acks > 0);
+      assert(in_msg.Acks >= 0);
       assert(is_valid(tbe));
       DPRINTF(RubySlicc, "Sender = %s\n", in_msg.Sender);
       DPRINTF(RubySlicc, "SilentAcks = %d\n", in_msg.SilentAcks);
diff --git a/src/mem/protocol/MOESI_hammer-dir.sm b/src/mem/protocol/MOESI_hammer-dir.sm
index bb0a97ac4..a4f4bf17a 100644
--- a/src/mem/protocol/MOESI_hammer-dir.sm
+++ b/src/mem/protocol/MOESI_hammer-dir.sm
@@ -951,6 +951,20 @@ machine(Directory, "AMD Hammer-like protocol")
             }
         }
       }
+    } else {
+      peek(requestQueue_in, RequestMsg) {
+          enqueue(responseNetwork_out, ResponseMsg, latency="1") {
+            out_msg.Address := address;
+            out_msg.Type := CoherenceResponseType:ACK;
+            out_msg.Sender := machineID;
+            out_msg.Destination.add(in_msg.Requestor);
+            out_msg.Dirty := false; // By definition, the block is now clean
+            out_msg.Acks := 0;
+            out_msg.SilentAcks := 0;
+            DPRINTF(RubySlicc, "%d\n", out_msg.Acks);
+            out_msg.MessageSize := MessageSizeType:Response_Control;
+          }
+      }
     }
   }
 
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