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Fix MMIO/cache refill concurrency bug in DCache 

There's a structural hazard on s2_req, so disallow cache refill initiation
while any MMIO loads are in flight.
This commit is contained in:
Andrew Waterman 2017-03-28 16:04:02 -07:00 committed by Andrew Waterman
parent db3ed12ce3
commit 44fb3be7d0
1 changed files with 1 additions and 1 deletions
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2
src/main/scala/rocket/DCache.scala
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@ -167,7 +167,7 @@ class DCacheModule(outer: DCache) extends HellaCacheModule(outer) {
val (s2_hit, s2_grow_param, s2_new_hit_state) = s2_hit_state.onAccess(s2_req.cmd)
val s2_valid_hit = s2_valid_masked && s2_readwrite && s2_hit
val s2_valid_miss = s2_valid_masked && s2_readwrite && !s2_hit && !(pstore1_valid || pstore2_valid) && !release_ack_wait
val s2_valid_cached_miss = s2_valid_miss && !s2_uncached
val s2_valid_cached_miss = s2_valid_miss && !s2_uncached && !uncachedInFlight.asUInt.orR
val s2_victimize = s2_valid_cached_miss || s2_flush_valid
val s2_valid_uncached = s2_valid_miss && s2_uncached
val s2_victim_way = Mux(s2_hit_valid && !s2_flush_valid, s2_hit_way, UIntToOH(RegEnable(s1_victim_way, s1_valid_not_nacked || s1_flush_valid)))