mem-cache: Use possible locations to find block

Use possible locations to find block to make it placement policy
independent.

Change-Id: I4c9d9e1e1ff91ce12e85ca1970f927d8f4f5a93b
Reviewed-on: https://gem5-review.googlesource.com/c/8884
Reviewed-by: Jason Lowe-Power <jason@lowepower.com>
Maintainer: Jason Lowe-Power <jason@lowepower.com>

1 files changed, 29 insertions, 0 deletions

diff --git a/src/mem/cache/tags/base.cc b/src/mem/cache/tags/base.cc
index 7f848e0d8..9358652bf 100644
--- a/src/mem/cache/tags/base.cc
+++ b/src/mem/cache/tags/base.cc
@@ -78,6 +78,35 @@ BaseTags::setCache(BaseCache *_cache)
     cache = _cache;
 }
 
+std::vector<ReplaceableEntry*>
+BaseTags::getPossibleLocations(const Addr addr) const
+{
+    panic("Unimplemented getPossibleLocations for tags subclass");
+}
+
+CacheBlk*
+BaseTags::findBlock(Addr addr, bool is_secure) const
+{
+    // Extract block tag
+    Addr tag = extractTag(addr);
+
+    // Find possible locations for the given address
+    const std::vector<ReplaceableEntry*> locations =
+        getPossibleLocations(addr);
+
+    // Search for block
+    for (const auto& location : locations) {
+        CacheBlk* blk = static_cast<CacheBlk*>(location);
+        if ((blk->tag == tag) && blk->isValid() &&
+            (blk->isSecure() == is_secure)) {
+            return blk;
+        }
+    }
+
+    // Did not find block
+    return nullptr;
+}
+
 void
 BaseTags::insertBlock(const Addr addr, const bool is_secure,
                       const int src_master_ID, const uint32_t task_ID,