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tilelink2 HintHandler: delay answers to help TL1 legacy clients

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This commit is contained in:
Wesley W. Terpstra 2016-10-28 15:07:35 -07:00
parent 72a7948ad2
commit 043ed48c8c
1 changed files with 5 additions and 5 deletions
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10
src/main/scala/uncore/tilelink2/HintHandler.scala
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@ -2,6 +2,7 @@
package uncore.tilelink2
import scala.math.min
import Chisel._
import chisel3.internal.sourceinfo.SourceInfo
import diplomacy._
@ -9,10 +10,9 @@ import diplomacy._
// Acks Hints for managers that don't support them or Acks all Hints if !passthrough
class TLHintHandler(supportManagers: Boolean = true, supportClients: Boolean = false, passthrough: Boolean = true) extends LazyModule
{
// HintAcks can come back combinationally => minLatency=0
val node = TLAdapterNode(
clientFn = { case Seq(c) => if (!supportClients) c else c.copy(minLatency = 0, clients = c.clients .map(_.copy(supportsHint = TransferSizes(1, c.maxTransfer)))) },
managerFn = { case Seq(m) => if (!supportManagers) m else m.copy(minLatency = 0, managers = m.managers.map(_.copy(supportsHint = TransferSizes(1, m.maxTransfer)))) })
clientFn = { case Seq(c) => if (!supportClients) c else c.copy(minLatency = min(1, c.minLatency), clients = c.clients .map(_.copy(supportsHint = TransferSizes(1, c.maxTransfer)))) },
managerFn = { case Seq(m) => if (!supportManagers) m else m.copy(minLatency = min(1, m.minLatency), managers = m.managers.map(_.copy(supportsHint = TransferSizes(1, m.maxTransfer)))) })
lazy val module = new LazyModuleImp(this) {
val io = new Bundle {
@ -46,7 +46,7 @@ class TLHintHandler(supportManagers: Boolean = true, supportClients: Boolean = f
hint.bits := edgeIn.HintAck(in.a.bits, edgeOut.manager.findIdStartFast(address))
out.a.bits := in.a.bits
TLArbiter(TLArbiter.lowestIndexFirst)(in.d, (edgeOut.numBeats1(out.d.bits), out.d), (UInt(0), hint))
TLArbiter(TLArbiter.lowestIndexFirst)(in.d, (edgeOut.numBeats1(out.d.bits), out.d), (UInt(0), Queue(hint, 1)))
} else {
out.a.valid := in.a.valid
in.a.ready := out.a.ready
@ -69,7 +69,7 @@ class TLHintHandler(supportManagers: Boolean = true, supportClients: Boolean = f
hint.bits := edgeOut.HintAck(out.b.bits)
in.b.bits := out.b.bits
TLArbiter(TLArbiter.lowestIndexFirst)(out.c, (edgeIn.numBeats1(in.c.bits), in.c), (UInt(0), hint))
TLArbiter(TLArbiter.lowestIndexFirst)(out.c, (edgeIn.numBeats1(in.c.bits), in.c), (UInt(0), Queue(hint, 1)))
} else if (bce) {
in.b.valid := out.b.valid
out.b.ready := in.b.ready