chatty_assert(!isReadOnly, "Should never see dirty snoop response "
"in read-only cache %s\n", name());
- } else if (pkt->cmd.isSWPrefetch() && pkt->needsWritable()) {
- // All other copies of the block were invalidated and we
- // have an exclusive copy.
-
- // The coherence protocol assumes that if we fetched an
- // exclusive copy of the block, we have the intention to
- // modify it. Therefore the MSHR for the PrefetchExReq has
- // been the point of ordering and this cache has commited
- // to respond to snoops for the block.
- //
- // In most cases this is true anyway - a PrefetchExReq
- // will be followed by a WriteReq. However, if that
- // doesn't happen, the block is not marked as dirty and
- // the cache doesn't respond to snoops that has committed
- // to do so.
- //
- // To avoid deadlocks in cases where there is a snoop
- // between the PrefetchExReq and the expected WriteReq, we
- // proactively mark the block as Dirty.
-
- blk->status |= BlkDirty;
-
- panic_if(!isReadOnly, "Prefetch exclusive requests from read-only "
- "cache %s\n", name());
}
}
// Software prefetch handling for cache closest to core
if (tgt_pkt->cmd.isSWPrefetch()) {
+ if (tgt_pkt->needsWritable()) {
+ // All other copies of the block were invalidated and we
+ // have an exclusive copy.
+
+ // The coherence protocol assumes that if we fetched an
+ // exclusive copy of the block, we have the intention to
+ // modify it. Therefore the MSHR for the PrefetchExReq has
+ // been the point of ordering and this cache has commited
+ // to respond to snoops for the block.
+ //
+ // In most cases this is true anyway - a PrefetchExReq
+ // will be followed by a WriteReq. However, if that
+ // doesn't happen, the block is not marked as dirty and
+ // the cache doesn't respond to snoops that has committed
+ // to do so.
+ //
+ // To avoid deadlocks in cases where there is a snoop
+ // between the PrefetchExReq and the expected WriteReq, we
+ // proactively mark the block as Dirty.
+ assert(blk);
+ blk->status |= BlkDirty;
+
+ panic_if(isReadOnly, "Prefetch exclusive requests from "
+ "read-only cache %s\n", name());
+ }
+
// a software prefetch would have already been ack'd
// immediately with dummy data so the core would be able to
// retire it. This request completes right here, so we