riscv/rocket-chip
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Grant bugfixes and more comments

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This commit is contained in:
Henry Cook
2015-04-13 15:57:06 -07:00
parent 3cf1778c92
commit 90f800d87d
2 changed files with 19 additions and 9 deletions
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25
uncore/src/main/scala/cache.scala
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@ -577,7 +577,7 @@ class L2VoluntaryReleaseTracker(trackerId: Int, bankId: Int) extends L2XactTrack
}
}
is(s_inner_grant) {
io.inner.grant.valid := Bool(true)
io.inner.grant.valid := !collect_irel_data
when(io.inner.grant.ready) {
state := Mux(io.ignt().requiresAck(), s_inner_finish, s_idle)
}
@ -587,6 +587,10 @@ class L2VoluntaryReleaseTracker(trackerId: Int, bankId: Int) extends L2XactTrack
when(io.inner.finish.valid) { state := s_idle }
}
}
// Checks for illegal behavior
assert(!(state === s_meta_resp && io.meta.resp.valid && !io.meta.resp.bits.tag_match),
"VoluntaryReleaseTracker accepted Release for a block not resident in this cache!")
}
@ -748,8 +752,7 @@ class L2AcquireTracker(trackerId: Int, bankId: Int) extends L2XactTracker {
updatePendingCohWhen(io.inner.release.fire(), pending_coh_on_irel)
mergeDataInner(io.inner.release)
// The following subtrascation handles misses or coherence permission
// upgrades by initiating a new transaction in the outer memory:
// 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
// to make an appropriate custom Acquire, otherwise we copy over the
@ -804,12 +807,17 @@ class L2AcquireTracker(trackerId: Int, bankId: Int) extends L2XactTracker {
pending_coh.inner.onGrant(
outgoing = io.ignt(),
dst = io.inner.grant.bits.header.dst),
pending_coh.outer)
Mux(ognt_data_done,
pending_coh_on_ognt.outer,
pending_coh.outer))
updatePendingCohWhen(io.inner.grant.fire(), pending_coh_on_ignt)
// We must wait for as many Finishes as we sent Grants
io.inner.finish.ready := state === s_busy
// We read from the the cache at this level if data wasn't written back or refilled.
// We may merge Gets, requiring further beats to be read.
// If ECC requires a full writemask, we'll read out data on partial writes as well.
pending_reads := (pending_reads &
dropPendingBit(io.data.read) &
dropPendingBitWhenBeatHasData(io.inner.release) &
@ -829,6 +837,8 @@ class L2AcquireTracker(trackerId: Int, bankId: Int) extends L2XactTracker {
addPendingBitInternal(io.data.read)
mergeDataInternal(io.data.resp)
// We write data to the cache at this level if it was Put here with allocate flag,
// written back dirty, or refilled from outer memory.
pending_writes := (pending_writes & dropPendingBit(io.data.write)) |
addPendingBitWhenBeatHasData(io.inner.acquire) |
addPendingBitWhenBeatHasData(io.inner.release) |
@ -883,11 +893,11 @@ class L2AcquireTracker(trackerId: Int, bankId: Int) extends L2XactTracker {
xact_src := io.inner.acquire.bits.header.src
xact := io.iacq()
xact.data := UInt(0)
pending_puts := Mux(
pending_puts := Mux( // Make sure to collect all data from a PutBlock
io.iacq().isBuiltInType(Acquire.putBlockType),
dropPendingBitWhenBeatHasData(io.inner.acquire),
UInt(0))
pending_reads := Mux(
pending_reads := Mux( // GetBlocks and custom types read all beats
io.iacq().isBuiltInType(Acquire.getBlockType) || !io.iacq().isBuiltInType(),
SInt(-1, width = innerDataBeats),
(addPendingBitWhenBeatIsGetOrAtomic(io.inner.acquire) |
@ -932,8 +942,7 @@ class L2AcquireTracker(trackerId: Int, bankId: Int) extends L2XactTracker {
when(state === s_wb_resp && io.wb.resp.valid) {
// If we're overwriting the whole block in a last level cache we can
// just do it without fetching any data from memory
val skip_outer_acquire = Bool(isLastLevelCache) &&
xact.isBuiltInType(Acquire.putBlockType)
val skip_outer_acquire = Bool(isLastLevelCache) && xact.isBuiltInType(Acquire.putBlockType)
state := Mux(!skip_outer_acquire, s_outer_acquire, s_busy)
}
when(state === s_inner_probe && !(pending_iprbs.orR || pending_irels)) {