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SourceShrinker improvements (#1197)

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* SourceShrinker: preserve FIFO guarantees of slaves

* tilelink: document that Releases can use TtoT, BtoB, and NtoN

TtoT is needed for write-through caches.
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Wesley W. Terpstra 2018-01-17 18:02:19 -08:00 committed by GitHub
parent 338e453a91
commit 5854fb5f7c
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2 changed files with 3 additions and 3 deletions
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2
src/main/scala/tilelink/Bundles.scala
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@ -76,7 +76,7 @@ object TLPermissions
def BtoN = UInt(2, cWidth) def BtoN = UInt(2, cWidth)
def isShrink(x: UInt) = x <= BtoN def isShrink(x: UInt) = x <= BtoN
// Report types (ProbeAck) // Report types (ProbeAck, Release)
def TtoT = UInt(3, cWidth) def TtoT = UInt(3, cWidth)
def BtoB = UInt(4, cWidth) def BtoB = UInt(4, cWidth)
def NtoN = UInt(5, cWidth) def NtoN = UInt(5, cWidth)

4
src/main/scala/tilelink/SourceShrinker.scala
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@ -18,8 +18,8 @@ class TLSourceShrinker(maxInFlight: Int)(implicit p: Parameters) extends LazyMod
sourceId = IdRange(0, maxInFlight)) sourceId = IdRange(0, maxInFlight))
val node = TLAdapterNode( val node = TLAdapterNode(
// We erase all client information since we crush the source Ids // We erase all client information since we crush the source Ids
clientFn = { _ => TLClientPortParameters(clients = Seq(client)) }, clientFn = { cp => TLClientPortParameters(clients = Seq(client.copy(requestFifo = cp.clients.exists(_.requestFifo)))) },
managerFn = { mp => mp.copy(managers = mp.managers.map(_.copy(fifoId = None))) }) managerFn = { mp => mp.copy(managers = mp.managers.map(m => m.copy(fifoId = if (maxInFlight==1) Some(0) else m.fifoId))) })
lazy val module = new LazyModuleImp(this) { lazy val module = new LazyModuleImp(this) {
(node.in zip node.out) foreach { case ((in, edgeIn), (out, edgeOut)) => (node.in zip node.out) foreach { case ((in, edgeIn), (out, edgeOut)) =>