mem-ruby: Add RubyHitMiss debug flags to print hit and miss information

Add RubyHitMiss debug flags to print hit and miss information. This can be
used to test the replacement policies by the traffic generator.

Change-Id: If9fe42c37e09be0534077fbf912d8699debd80fd
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/21719
Tested-by: kokoro <noreply+kokoro@google.com>
Reviewed-by: Jason Lowe-Power <power.jg@gmail.com>
Maintainer: Matt Sinclair <mattdsinclair@gmail.com>

src/mem/ruby/SConscript

@@ -68,11 +68,12 @@ DebugFlag('RubyTester')
 DebugFlag('RubyStats')
 DebugFlag('RubyResourceStalls')
 DebugFlag('RubyProtocol')
+DebugFlag('RubyHitMiss')
 
 CompoundFlag('Ruby', [ 'RubyQueue', 'RubyNetwork', 'RubyTester',
     'RubyGenerated', 'RubySlicc', 'RubySystem', 'RubyCache',
     'RubyDma', 'RubyPort', 'RubySequencer', 'RubyCacheTrace',
-    'RubyPrefetcher', 'RubyProtocol'])
+    'RubyPrefetcher', 'RubyProtocol', 'RubyHitMiss'])
 
 #
 # Link includes

src/mem/ruby/system/Sequencer.cc

@@ -48,6 +48,7 @@
 #include "debug/LLSC.hh"
 #include "debug/MemoryAccess.hh"
 #include "debug/ProtocolTrace.hh"
+#include "debug/RubyHitMiss.hh"
 #include "debug/RubySequencer.hh"
 #include "debug/RubyStats.hh"
 #include "mem/packet.hh"
@@ -630,6 +631,10 @@ Sequencer::hitCallback(SequencerRequest* srequest, DataBlock& data,
         llscLoadLinked(line_addr);
     }
 
+    DPRINTF(RubyHitMiss, "Cache %s at %#x\n",
+                         externalHit ? "miss" : "hit",
+                         printAddress(request_address));
+
     // update the data unless it is a non-data-carrying flush
     if (RubySystem::getWarmupEnabled()) {
         data.setData(pkt);