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For D$, use source 0 through N-1 for MMIO, not 1 through N 

This makes the code a bit cleaner.
This commit is contained in:
Andrew Waterman 2017-03-23 13:07:14 -07:00
parent 3951e57789
commit 0538dc77ce
2 changed files with 7 additions and 9 deletions
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15
src/main/scala/rocket/DCache.scala
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@ -87,9 +87,8 @@ class DCacheModule(outer: DCache) extends HellaCacheModule(outer) {
io.cpu.req.ready := (release_state === s_ready) && !cached_grant_wait && !s1_nack
// I/O MSHRs
val mmioOffset = if (outer.scratch().isDefined) 0 else 1
val uncachedInFlight = Seq.fill(maxUncachedInFlight) { RegInit(Bool(false)) }
val uncachedReqs = Seq.fill(maxUncachedInFlight) { Reg(new HellaCacheReq) }
val uncachedInFlight = Seq.fill(cacheParams.nMMIOs) { RegInit(Bool(false)) }
val uncachedReqs = Seq.fill(cacheParams.nMMIOs) { Reg(new HellaCacheReq) }
// hit initiation path
dataArb.io.in(3).valid := io.cpu.req.valid && isRead(io.cpu.req.bits.cmd)
@ -251,13 +250,13 @@ class DCacheModule(outer: DCache) extends HellaCacheModule(outer) {
metaWriteArb.io.in(0).bits.data.tag := s2_req.addr(paddrBits-1, untagBits)
// Prepare a TileLink request message that initiates a transaction
val a_source = PriorityEncoder(~uncachedInFlight.asUInt << mmioOffset) // skip the MSHR
val a_source = PriorityEncoder(~uncachedInFlight.asUInt) // skip the MSHR
val acquire_address = s2_req_block_addr
val access_address = s2_req.addr
val a_size = s2_req.typ(MT_SZ-2, 0)
val a_data = Fill(beatWords, pstore1_storegen.data)
val acquire = if (edge.manager.anySupportAcquireB) {
edge.Acquire(UInt(0), acquire_address, lgCacheBlockBytes, s2_grow_param)._2 // Cacheability checked by tlb
edge.Acquire(UInt(cacheParams.nMMIOs), acquire_address, lgCacheBlockBytes, s2_grow_param)._2 // Cacheability checked by tlb
} else {
Wire(new TLBundleA(edge.bundle))
}
@ -285,7 +284,7 @@ class DCacheModule(outer: DCache) extends HellaCacheModule(outer) {
tl_out.a.bits := Mux(!s2_uncached, acquire, Mux(!s2_write, get, Mux(!pstore1_amo, put, atomics)))
// Set pending bits for outstanding TileLink transaction
val a_sel = UIntToOH(a_source, maxUncachedInFlight+mmioOffset) >> mmioOffset
val a_sel = UIntToOH(a_source, cacheParams.nMMIOs)
when (tl_out.a.fire()) {
when (s2_uncached) {
(a_sel.toBools zip (uncachedInFlight zip uncachedReqs)) foreach { case (s, (f, r)) =>
@ -312,7 +311,7 @@ class DCacheModule(outer: DCache) extends HellaCacheModule(outer) {
assert(cached_grant_wait, "A GrantData was unexpected by the dcache.")
when(d_last) { cached_grant_wait := false }
} .elsewhen (grantIsUncached) {
val d_sel = UIntToOH(tl_out.d.bits.source, maxUncachedInFlight+mmioOffset) >> mmioOffset
val d_sel = UIntToOH(tl_out.d.bits.source, cacheParams.nMMIOs)
val req = Mux1H(d_sel, uncachedReqs)
(d_sel.toBools zip uncachedInFlight) foreach { case (s, f) =>
when (s && d_last) {
@ -390,7 +389,7 @@ class DCacheModule(outer: DCache) extends HellaCacheModule(outer) {
val voluntaryReleaseMessage = if (edge.manager.anySupportAcquireB) {
edge.Release(
fromSource = UInt(maxUncachedInFlight - 1),
fromSource = UInt(cacheParams.nMMIOs - 1),
toAddress = probe_bits.address,
lgSize = lgCacheBlockBytes,
shrinkPermissions = s2_shrink_param,

1
src/main/scala/rocket/HellaCache.scala
View File

@ -60,7 +60,6 @@ trait HasL1HellaCacheParameters extends HasL1CacheParameters with HasCoreParamet
def encRowBits = encDataBits*rowWords
def lrscCycles = 32 // ISA requires 16-insn LRSC sequences to succeed
def nIOMSHRs = cacheParams.nMMIOs
def maxUncachedInFlight = cacheParams.nMMIOs
def dataScratchpadSize = cacheParams.dataScratchpadBytes
require(rowBits >= coreDataBits, s"rowBits($rowBits) < coreDataBits($coreDataBits)")