commit 507a0cecc5fb7e7575079e945188800552f30288
author Pouya Fotouhi <Pouya.Fotouhi@amd.com> Wed Aug 07 19:43:27 2019 -0500
committer Pouya Fotouhi <pfotouhi@ucdavis.edu> Mon Aug 12 18:21:28 2019 +0000
tree 4f12cc8408249a53bae9a0312f99226e52bf47f0
parent e424be8281cfca6b05297a9d51ca979b555bdfca

mem-ruby: Use check_on_cache_probe to protect locked lines from eviction

This change uses check_on_cache_probe statement to check if the cacheline
subject to eviction is locked in MESI Three Level.

Change-Id: Ib0de54aa067c7603db1f7321cc4825b123b641ac
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/19868
Reviewed-by: Jason Lowe-Power <jason@lowepower.com>
Maintainer: Jason Lowe-Power <jason@lowepower.com>
Tested-by: kokoro <noreply+kokoro@google.com>

src/mem/protocol/MESI_Three_Level-L0cache.sm

diff --git a/src/mem/protocol/MESI_Three_Level-L0cache.sm b/src/mem/protocol/MESI_Three_Level-L0cache.sm
index a87a3d9..84bb0d8 100644
--- a/src/mem/protocol/MESI_Three_Level-L0cache.sm
+++ b/src/mem/protocol/MESI_Three_Level-L0cache.sm
@@ -324,9 +324,12 @@
                       Icache_entry, TBEs[in_msg.LineAddress]);
             } else {
               // No room in the L0, so we need to make room in the L0
-              trigger(Event:L0_Replacement, Icache.cacheProbe(in_msg.LineAddress),
-                      getICacheEntry(Icache.cacheProbe(in_msg.LineAddress)),
-                      TBEs[Icache.cacheProbe(in_msg.LineAddress)]);
+              // Check if the line we want to evict is not locked
+              Addr addr := Icache.cacheProbe(in_msg.LineAddress);
+              check_on_cache_probe(mandatoryQueue_in, addr);
+              trigger(Event:L0_Replacement, addr,
+                      getICacheEntry(addr),
+                      TBEs[addr]);
             }
           }
         } else {
@@ -354,9 +357,12 @@
                       Dcache_entry, TBEs[in_msg.LineAddress]);
             } else {
               // No room in the L1, so we need to make room in the L0
-              trigger(Event:L0_Replacement, Dcache.cacheProbe(in_msg.LineAddress),
-                      getDCacheEntry(Dcache.cacheProbe(in_msg.LineAddress)),
-                      TBEs[Dcache.cacheProbe(in_msg.LineAddress)]);
+              // Check if the line we want to evict is not locked
+              Addr addr := Dcache.cacheProbe(in_msg.LineAddress);
+              check_on_cache_probe(mandatoryQueue_in, addr);
+              trigger(Event:L0_Replacement, addr,
+                      getDCacheEntry(addr),
+                      TBEs[addr]);
             }
           }
         }