mem-ruby: add function to check for stalled msgs of addr

This patch allows a cache controller to check if there
is any stalled message of a specific address in the
stall_map of an input message buffer.

Change-Id: Id2f9bb98a9201a562f2a8cc371e9bb896ac836af
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/28133
Reviewed-by: Jason Lowe-Power <power.jg@gmail.com>
Reviewed-by: Matt Sinclair <mattdsinclair@gmail.com>
Maintainer: Jason Lowe-Power <power.jg@gmail.com>
Tested-by: kokoro <noreply+kokoro@google.com>

src/mem/ruby/network/MessageBuffer.cc

@@ -394,6 +394,12 @@ MessageBuffer::stallMessage(Addr addr, Tick current_time)
     m_stall_count++;
 }
 
+bool
+MessageBuffer::hasStalledMsg(Addr addr) const
+{
+    return (m_stall_msg_map.count(addr) != 0);
+}
+
 void
 MessageBuffer::deferEnqueueingMessage(Addr addr, MsgPtr message)
 {

src/mem/ruby/network/MessageBuffer.hh

@@ -74,6 +74,8 @@ class MessageBuffer : public SimObject
     void reanalyzeMessages(Addr addr, Tick current_time);
     void reanalyzeAllMessages(Tick current_time);
     void stallMessage(Addr addr, Tick current_time);
+    // return true if the stall map has a message of this address
+    bool hasStalledMsg(Addr addr) const;
 
     // TRUE if head of queue timestamp <= SystemTime
     bool isReady(Tick current_time) const;
@@ -124,7 +126,6 @@ class MessageBuffer : public SimObject
     // enqueue all previously deferred messages that are associated with the
     // input address
     void enqueueDeferredMessages(Addr addr, Tick curTime, Tick delay);
-
     bool isDeferredMsgMapEmpty(Addr addr) const;
 
     //! Updates the delay cycles of the message at the head of the queue,

src/mem/ruby/protocol/RubySlicc_Types.sm

@@ -63,6 +63,7 @@ structure(InPort, external = "yes", primitive="yes") {
   bool isEmpty();
   bool isStallMapEmpty();
   int getStallMapSize();
+  bool hasStalledMsg(Addr addr);
 }
 
 external_type(NodeID, default="0", primitive="yes");