riscv/rocket-chip
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Don't perform in-place correction if there was a recent store (#988)

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Since the correction updates the entire word, the WAW hazard detection
logic is not sufficient to prevent overwriting a recent store.  So,
re-read the word after all pending stores have drained.
This commit is contained in:
Andrew Waterman 2017-09-08 16:26:54 -07:00 committed by GitHub
parent e7de7f3e82
commit 1f606d924f
1 changed files with 2 additions and 1 deletions
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src/main/scala/rocket/DCache.scala
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@ -290,8 +290,9 @@ class DCacheModule(outer: DCache) extends HellaCacheModule(outer) {
when (lrscCount > 0) { lrscCount := lrscCount - 1 }
when ((s2_valid_masked && lrscCount > 0) || io.cpu.invalidate_lr) { lrscCount := 0 }
// don't perform data correction if it might clobber a recent store
val s2_correct = s2_data_error && !any_pstore_valid && !RegNext(any_pstore_valid) && Bool(usingDataScratchpad)
// pending store buffer
val s2_correct = s2_data_error && !any_pstore_valid && Bool(usingDataScratchpad)
val s2_valid_correct = s2_valid_hit_pre_data_ecc && s2_correct
val pstore1_cmd = RegEnable(s1_req.cmd, s1_valid_not_nacked && s1_write)
val pstore1_addr = RegEnable(s1_paddr, s1_valid_not_nacked && s1_write)