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Guarantee probe forward progress during LR storm

This commit is contained in:
Andrew Waterman
2017-04-14 01:09:13 -07:00
committed by Andrew Waterman
parent 71eaed7d60
commit 7871ec82c4
3 changed files with 7 additions and 6 deletions

View File

@ -794,18 +794,18 @@ class NonBlockingDCacheModule(outer: NonBlockingDCache) extends HellaCacheModule
// load-reserved/store-conditional
val lrsc_count = Reg(init=UInt(0))
val lrsc_valid = lrsc_count.orR
val lrsc_valid = lrsc_count > lrscBackoff
val lrsc_addr = Reg(UInt())
val (s2_lr, s2_sc) = (s2_req.cmd === M_XLR, s2_req.cmd === M_XSC)
val s2_lrsc_addr_match = lrsc_valid && lrsc_addr === (s2_req.addr >> blockOffBits)
val s2_sc_fail = s2_sc && !s2_lrsc_addr_match
when (lrsc_valid) { lrsc_count := lrsc_count - 1 }
when (lrsc_count > 0) { lrsc_count := lrsc_count - 1 }
when (s2_valid_masked && s2_hit || s2_replay) {
when (s2_lr) {
lrsc_count := lrscCycles - 1
lrsc_addr := s2_req.addr >> blockOffBits
}
when (lrsc_valid) {
when (lrsc_count > 0) {
lrsc_count := 0
}
}