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tilelink2: WidthWidget and Fragmenter no longer erase latency

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This commit is contained in:
Wesley W. Terpstra 2016-10-12 21:11:32 -07:00
parent 200cf3dd13
commit 54b73aef57
3 changed files with 6 additions and 8 deletions
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6
src/main/scala/uncore/tilelink2/Buffer.scala
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@ -5,7 +5,7 @@ package uncore.tilelink2
import Chisel._ import Chisel._
import chisel3.internal.sourceinfo.SourceInfo import chisel3.internal.sourceinfo.SourceInfo
import diplomacy._ import diplomacy._
import scala.math.max import scala.math.{min,max}
// pipe is only used if a queue has depth = 1 // pipe is only used if a queue has depth = 1
class TLBuffer(a: Int = 2, b: Int = 2, c: Int = 2, d: Int = 2, e: Int = 2, pipe: Boolean = true) extends LazyModule class TLBuffer(a: Int = 2, b: Int = 2, c: Int = 2, d: Int = 2, e: Int = 2, pipe: Boolean = true) extends LazyModule
@ -17,8 +17,8 @@ class TLBuffer(a: Int = 2, b: Int = 2, c: Int = 2, d: Int = 2, e: Int = 2, pipe:
require (e >= 0) require (e >= 0)
val node = TLAdapterNode( val node = TLAdapterNode(
clientFn = { seq => seq(0).copy(minLatency = seq(0).minLatency + max(1,b) + max(1,c)) }, clientFn = { seq => seq(0).copy(minLatency = seq(0).minLatency + min(1,b) + min(1,c)) },
managerFn = { seq => seq(0).copy(minLatency = seq(0).minLatency + max(1,a) + max(1,d)) }) managerFn = { seq => seq(0).copy(minLatency = seq(0).minLatency + min(1,a) + min(1,d)) })
lazy val module = new LazyModuleImp(this) { lazy val module = new LazyModuleImp(this) {
val io = new Bundle { val io = new Bundle {

3
src/main/scala/uncore/tilelink2/Fragmenter.scala
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@ -39,10 +39,9 @@ class TLFragmenter(minSize: Int, maxSize: Int, alwaysMin: Boolean = false) exten
def mapClient(c: TLClientParameters) = c.copy( def mapClient(c: TLClientParameters) = c.copy(
sourceId = IdRange(c.sourceId.start << fragmentBits, c.sourceId.end << fragmentBits)) sourceId = IdRange(c.sourceId.start << fragmentBits, c.sourceId.end << fragmentBits))
// Because the Fragmenter stalls inner A while serving outer, it can wipe away inner latency
val node = TLAdapterNode( val node = TLAdapterNode(
clientFn = { case Seq(c) => c.copy(clients = c.clients.map(mapClient)) }, clientFn = { case Seq(c) => c.copy(clients = c.clients.map(mapClient)) },
managerFn = { case Seq(m) => m.copy(managers = m.managers.map(mapManager), minLatency = 0) }) managerFn = { case Seq(m) => m.copy(managers = m.managers.map(mapManager)) })
lazy val module = new LazyModuleImp(this) { lazy val module = new LazyModuleImp(this) {
val io = new Bundle { val io = new Bundle {

5
src/main/scala/uncore/tilelink2/WidthWidget.scala
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@ -10,10 +10,9 @@ import scala.math.{min,max}
// innBeatBytes => the new client-facing bus width // innBeatBytes => the new client-facing bus width
class TLWidthWidget(innerBeatBytes: Int) extends LazyModule class TLWidthWidget(innerBeatBytes: Int) extends LazyModule
{ {
// Because we stall the request while sending beats, atomics can overlap => minLatency=0
val node = TLAdapterNode( val node = TLAdapterNode(
clientFn = { case Seq(c) => c.copy(minLatency = 0) }, clientFn = { case Seq(c) => c },
managerFn = { case Seq(m) => m.copy(minLatency = 0, beatBytes = innerBeatBytes) }) managerFn = { case Seq(m) => m.copy(beatBytes = innerBeatBytes) })
lazy val module = new LazyModuleImp(this) { lazy val module = new LazyModuleImp(this) {
val io = new Bundle { val io = new Bundle {