prefetch: don't panic on requests w/o contextID (e.g., writebacks).

2 files changed, 11 insertions, 1 deletions

diff --git a/src/mem/cache/prefetch/ghb.cc b/src/mem/cache/prefetch/ghb.cc
index c27165248..f8f7de1db 100644
--- a/src/mem/cache/prefetch/ghb.cc
+++ b/src/mem/cache/prefetch/ghb.cc
@@ -34,13 +34,18 @@
  * GHB Prefetcher implementation.
  */
 
+#include "base/trace.hh"
 #include "mem/cache/prefetch/ghb.hh"
-#include "arch/isa_traits.hh"
 
 void
 GHBPrefetcher::calculatePrefetch(PacketPtr &pkt, std::list<Addr> &addresses,
                                  std::list<Tick> &delays)
 {
+    if (useContextId && !pkt->req->hasContextId()) {
+        DPRINTF(HWPrefetch, "ignoring request with no context ID");
+        return;
+    }
+
     Addr blk_addr = pkt->getAddr() & ~(Addr)(blkSize-1);
     int ctx_id = useContextId ? pkt->req->contextId() : 0;
     assert(ctx_id < Max_Contexts);
diff --git a/src/mem/cache/prefetch/stride.cc b/src/mem/cache/prefetch/stride.cc
index cfd2469fa..8af4e615e 100644
--- a/src/mem/cache/prefetch/stride.cc
+++ b/src/mem/cache/prefetch/stride.cc
@@ -46,6 +46,11 @@ StridePrefetcher::calculatePrefetch(PacketPtr &pkt, std::list<Addr> &addresses,
         return;
     }
 
+    if (useContextId && !pkt->req->hasContextId()) {
+        DPRINTF(HWPrefetch, "ignoring request with no context ID");
+        return;
+    }
+
     Addr blk_addr = pkt->getAddr() & ~(Addr)(blkSize-1);
     int ctx_id = useContextId ? pkt->req->contextId() : 0;
     Addr pc = pkt->req->getPC();