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Bugfix for merged voluntary releases in L2Cache.

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Track pending release beats for voluntary releases that are merged by Acquire Trackers.
Closes #23 and #24.
This commit is contained in:
Henry Cook 2016-04-01 19:40:11 -07:00
parent 82bdf3afcb
commit c292a07ace
1 changed files with 14 additions and 9 deletions
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23
uncore/src/main/scala/cache.scala
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@ -524,12 +524,13 @@ class L2VoluntaryReleaseTracker(trackerId: Int)(implicit p: Parameters) extends
val xact_old_meta = Reg{ new L2Metadata }
val coh = xact_old_meta.coh
val pending_irels = Reg(init=Bits(0, width = io.inner.tlDataBeats))
val pending_irel_beats = Reg(init=Bits(0, width = io.inner.tlDataBeats))
val pending_writes = Reg(init=Bits(0, width = io.inner.tlDataBeats))
val pending_ignt = Reg(init=Bool(false))
val all_pending_done =
!(pending_writes.orR ||
pending_irel_beats.orR ||
pending_ignt)
// These IOs are used for routing in the parent
@ -538,8 +539,8 @@ class L2VoluntaryReleaseTracker(trackerId: Int)(implicit p: Parameters) extends
io.matches.oprb := (state =/= s_idle) && io.oprb().conflicts(xact)
// Accept a voluntary Release (and any further beats of data)
pending_irels := (pending_irels & dropPendingBitWhenBeatHasData(io.inner.release))
io.inner.release.ready := ((state === s_idle) && io.irel().isVoluntary()) || pending_irels.orR
pending_irel_beats := (pending_irel_beats & dropPendingBitWhenBeatHasData(io.inner.release))
io.inner.release.ready := ((state === s_idle) && io.irel().isVoluntary()) || pending_irel_beats.orR
when(io.inner.release.fire()) { xact.data_buffer(io.irel().addr_beat) := io.irel().data }
// Begin a transaction by getting the current block metadata
@ -561,7 +562,7 @@ class L2VoluntaryReleaseTracker(trackerId: Int)(implicit p: Parameters) extends
io.data.write.bits.data := xact.data_buffer(curr_write_beat)
// Send an acknowledgement
io.inner.grant.valid := state === s_busy && pending_ignt && !pending_irels
io.inner.grant.valid := state === s_busy && pending_ignt && !pending_irel_beats.orR
io.inner.grant.bits := coh.inner.makeGrant(xact)
when(io.inner.grant.fire()) { pending_ignt := Bool(false) }
@ -579,11 +580,9 @@ class L2VoluntaryReleaseTracker(trackerId: Int)(implicit p: Parameters) extends
// State machine updates and transaction handler metadata intialization
when(state === s_idle && io.inner.release.valid && io.alloc.irel) {
xact := io.irel()
when(io.irel().hasMultibeatData()) {
pending_irels := dropPendingBitWhenBeatHasData(io.inner.release)
}. otherwise {
pending_irels := UInt(0)
}
pending_irel_beats := Mux(io.irel().hasMultibeatData(),
dropPendingBitWhenBeatHasData(io.inner.release),
UInt(0))
pending_writes := addPendingBitWhenBeatHasData(io.inner.release)
pending_ignt := io.irel().requiresAck()
state := s_meta_read
@ -680,6 +679,7 @@ class L2AcquireTracker(trackerId: Int)(implicit p: Parameters) extends L2XactTra
val pending_puts = Reg(init=Bits(0, width = io.inner.tlDataBeats))
val pending_iprbs = Reg(init = Bits(0, width = io.inner.tlNCachingClients))
val pending_reads = Reg(init=Bits(0, width = io.inner.tlDataBeats))
val pending_irel_beats = Reg(init=Bits(0, width = io.inner.tlDataBeats))
val pending_writes = Reg(init=Bits(0, width = io.inner.tlDataBeats))
val pending_resps = Reg(init=Bits(0, width = io.inner.tlDataBeats))
val ignt_data_ready = Reg(init=Bits(0, width = io.inner.tlDataBeats))
@ -691,6 +691,7 @@ class L2AcquireTracker(trackerId: Int)(implicit p: Parameters) extends L2XactTra
pending_writes.orR ||
pending_resps.orR ||
pending_puts.orR ||
pending_irel_beats.orR ||
pending_ognt ||
ignt_q.io.count > UInt(0) ||
pending_vol_ignt ||
@ -879,7 +880,11 @@ class L2AcquireTracker(trackerId: Int)(implicit p: Parameters) extends L2XactTra
xact_vol_ir_r_type := io.irel().r_type
xact_vol_ir_src := io.irel().client_id
xact_vol_ir_client_xact_id := io.irel().client_xact_id
pending_irel_beats := Mux(io.irel().hasMultibeatData(),
dropPendingBitWhenBeatHasData(io.inner.release),
UInt(0))
}
pending_irel_beats := (pending_irel_beats & dropPendingBitWhenBeatHasData(io.inner.release))
// Handle misses or coherence permission upgrades by initiating a new transaction in the outer memory:
//