mem: Adding verbose debug output in the memory system

[gem5.git] / src / mem / cache / tags / lru.cc

diff --git a/src/mem/cache/tags/lru.cc b/src/mem/cache/tags/lru.cc
index babcedc89b1c8ba8e54e13c36496d1cfc94fb2e2..f515ed053a2e1932915cb1787c5a6d3abba09315 100644 (file)
--- a/src/mem/cache/tags/lru.cc
+++ b/src/mem/cache/tags/lru.cc
@@ -1,4 +1,16 @@
 /*
+ * Copyright (c) 2012 ARM Limited
+ * All rights reserved.
+ *
+ * The license below extends only to copyright in the software and shall
+ * not be construed as granting a license to any other intellectual
+ * property including but not limited to intellectual property relating
+ * to a hardware implementation of the functionality of the software
+ * licensed hereunder.  You may use the software subject to the license
+ * terms below provided that you ensure that this notice is replicated
+ * unmodified and in its entirety in all distributions of the software,
+ * modified or unmodified, in source code or in binary form.
+ *
  * Copyright (c) 2003-2005 The Regents of The University of Michigan
  * All rights reserved.
  *
@@ -36,6 +48,7 @@
 #include <string>
 
 #include "base/intmath.hh"
+#include "debug/Cache.hh"
 #include "debug/CacheRepl.hh"
 #include "mem/cache/tags/cacheset.hh"
 #include "mem/cache/tags/lru.hh"
@@ -92,7 +105,7 @@ LRU::LRU(unsigned _numSets, unsigned _blkSize, unsigned _assoc,
             ++blkIndex;
 
             // invalidate new cache block
-            blk->status = 0;
+            blk->invalidate();
 
             //EGH Fix Me : do we need to initialize blk?
 
@@ -116,7 +129,7 @@ LRU::~LRU()
 }
 
 LRU::BlkType*
-LRU::accessBlock(Addr addr, int &lat, int master_id)
+LRU::accessBlock(Addr addr, Cycles &lat, int master_id)
 {
     Addr tag = extractTag(addr);
     unsigned set = extractSet(addr);
@@ -128,8 +141,8 @@ LRU::accessBlock(Addr addr, int &lat, int master_id)
         DPRINTF(CacheRepl, "set %x: moving blk %x to MRU\n",
                 set, regenerateBlkAddr(tag, set));
         if (blk->whenReady > curTick()
-            && blk->whenReady - curTick() > hitLatency) {
-            lat = blk->whenReady - curTick();
+            && cache->ticksToCycles(blk->whenReady - curTick()) > hitLatency) {
+            lat = cache->ticksToCycles(blk->whenReady - curTick());
         }
         blk->refCount += 1;
     }
@@ -186,8 +199,11 @@ LRU::insertBlock(Addr addr, BlkType *blk, int master_id)
         // deal with evicted block
         assert(blk->srcMasterId < cache->system->maxMasters());
         occupancies[blk->srcMasterId]--;
+
+        blk->invalidate();
     }
 
+    blk->isTouched = true;
     // Set tag for new block.  Caller is responsible for setting status.
     blk->tag = extractTag(addr);
 
@@ -201,19 +217,18 @@ LRU::insertBlock(Addr addr, BlkType *blk, int master_id)
 }
 
 void
-LRU::invalidateBlk(BlkType *blk)
+LRU::invalidate(BlkType *blk)
 {
-    if (blk) {
-        if (blk->isValid()) {
-            tagsInUse--;
-            assert(blk->srcMasterId < cache->system->maxMasters());
-            occupancies[blk->srcMasterId]--;
-            blk->srcMasterId = Request::invldMasterId;
-        }
-        blk->status = 0;
-        blk->isTouched = false;
-        blk->clearLoadLocks();
-    }
+    assert(blk);
+    assert(blk->isValid());
+    tagsInUse--;
+    assert(blk->srcMasterId < cache->system->maxMasters());
+    occupancies[blk->srcMasterId]--;
+    blk->srcMasterId = Request::invldMasterId;
+
+    // should be evicted before valid blocks
+    unsigned set = blk->set;
+    sets[set].moveToTail(blk);
 }
 
 void
@@ -224,6 +239,23 @@ LRU::clearLocks()
     }
 }
 
+std::string
+LRU::print() const {
+    std::string cache_state;
+    for (unsigned i = 0; i < numSets; ++i) {
+        // link in the data blocks
+        for (unsigned j = 0; j < assoc; ++j) {
+            BlkType *blk = sets[i].blks[j];
+            if (blk->isValid())
+                cache_state += csprintf("\tset: %d block: %d %s\n", i, j,
+                        blk->print());
+        }
+    }
+    if (cache_state.empty())
+        cache_state = "no valid tags\n";
+    return cache_state;
+}
+
 void
 LRU::cleanupRefs()
 {