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make sure L2 passes no-alloc acquires through to outer memory

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This commit is contained in:
Howard Mao 2015-11-12 15:40:58 -08:00
parent b3865c370a
commit 7e7d688a01
1 changed files with 19 additions and 7 deletions
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24
uncore/src/main/scala/cache.scala
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@ -709,6 +709,7 @@ class L2AcquireTracker(trackerId: Int)(implicit p: Parameters) extends L2XactTra
updatePendingCohWhen(io.inner.release.fire(), pending_coh_on_irel)
mergeDataInner(io.inner.release)
val outerParams = p.alterPartial({ case TLId => p(OuterTLId) })
// Handle misses or coherence permission upgrades by initiating a new transaction in the outer memory:
//
// If we're allocating in this cache, we can use the current metadata
@ -716,11 +717,19 @@ class L2AcquireTracker(trackerId: Int)(implicit p: Parameters) extends L2XactTra
// built-in Acquire from the inner TL to the outer TL
io.outer.acquire.valid := state === s_outer_acquire &&
(xact.allocate() || !pending_puts(oacq_data_idx))
io.outer.acquire.bits := Mux(xact.allocate(), xact_old_meta.coh.outer, ClientMetadata.onReset)
.makeAcquire(
io.outer.acquire.bits := Mux(xact.allocate(),
xact_old_meta.coh.outer.makeAcquire(
client_xact_id = UInt(0),
addr_block = xact.addr_block,
op_code = xact.op_code())
op_code = xact.op_code()),
Acquire(
is_builtin_type = Bool(true),
a_type = xact.a_type,
client_xact_id = UInt(0),
addr_block = xact.addr_block,
addr_beat = xact.addr_beat,
union = xact.union)(outerParams))
io.oacq().data := xact.data_buffer(oacq_data_idx)
// Handle the response from outer memory
@ -792,7 +801,8 @@ class L2AcquireTracker(trackerId: Int)(implicit p: Parameters) extends L2XactTra
pending_writes := (pending_writes & dropPendingBit(io.data.write)) |
addPendingBitWhenBeatHasDataAndAllocs(io.inner.acquire) |
addPendingBitWhenBeatHasData(io.inner.release) |
addPendingBitWhenBeatHasData(io.outer.grant)
(Fill(refillCycles, xact.allocate()) &
addPendingBitWhenBeatHasData(io.outer.grant))
val curr_write_beat = PriorityEncoder(pending_writes)
io.data.write.valid := state === s_busy &&
pending_writes.orR &&
@ -807,7 +817,7 @@ class L2AcquireTracker(trackerId: Int)(implicit p: Parameters) extends L2XactTra
io.data.write.bits.data := xact.data_buffer(curr_write_beat)
// End a transaction by updating the block metadata
io.meta.write.valid := state === s_meta_write
io.meta.write.valid := (state === s_meta_write) && pending_meta_write
io.meta.write.bits.id := UInt(trackerId)
io.meta.write.bits.idx := xact.addr_block(idxMSB,idxLSB)
io.meta.write.bits.way_en := xact_way_en
@ -864,7 +874,9 @@ class L2AcquireTracker(trackerId: Int)(implicit p: Parameters) extends L2XactTra
(coh.outer.requiresVoluntaryWriteback() ||
coh.inner.requiresProbesOnVoluntaryWriteback())
val needs_inner_probes = tag_match && coh.inner.requiresProbes(xact)
when(!tag_match || is_hit && pending_coh_on_hit != coh) { pending_meta_write := Bool(true) }
val should_update_meta = !tag_match && xact.allocate() ||
is_hit && pending_coh_on_hit != coh
when (should_update_meta) { pending_meta_write := Bool(true) }
pending_coh := Mux(is_hit, pending_coh_on_hit, Mux(tag_match, coh, pending_coh_on_miss))
when (needs_inner_probes) {
val full_sharers = coh.inner.full()