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numerous coalescer bug fixes + working unit test

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This commit is contained in:
Richard Yan
2023-05-07 02:31:28 -07:00
parent c783f147f9
commit 86e7d3d60d
2 changed files with 39 additions and 15 deletions
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19
src/main/scala/tilelink/Coalescing.scala
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@@ -79,7 +79,7 @@ object defaultConfig extends CoalescerConfig(
sizeEnum = DefaultInFlightTableSizeEnum,
numCoalReq = 1,
arbiterOutputs = 4,
bankStrideInBytes = 64 //Current L2 is strided by 512 bits
bankStrideInBytes = 64 // Current L2 is strided by 512 bits
)
class CoalescingUnit(config: CoalescerConfig)(implicit p: Parameters) extends LazyModule {
@@ -236,7 +236,7 @@ class CoalShiftQueue[T <: Data](gen: T, entries: Int, config: CoalescerConfig) e
c && !(io.invalidate.valid && i)
}.reduce(_ || _)
val syncedEnqValid = io.queue.enq.map(_.valid).reduce(_ || _)
val syncedDeqValid = io.queue.deq.map(_.valid).reduce(_ || _)
val syncedDeqValid = io.queue.deq.map(x => x.valid && !x.ready).reduce(_ || _) // valid and not fire
for (i <- 0 until config.numLanes) {
val enq = io.queue.enq(i)
@@ -312,7 +312,7 @@ class MonoCoalescer(coalLogSize: Int, windowT: CoalShiftQueue[ReqQueueEntry],
// number of entries matched with this leader lane's head.
// maximum is numLanes * queueDepth
val matchCount = Output(UInt(log2Ceil(config.numLanes * config.queueDepth + 1).W))
val coverageHits = Output(UInt((1 << config.maxCoalLogSize).W))
val coverageHits = Output(UInt((config.maxCoalLogSize - config.wordWidth + 1).W))
val canCoalesce = Output(Vec(config.numLanes, Bool()))
})
})
@@ -394,7 +394,7 @@ class MonoCoalescer(coalLogSize: Int, windowT: CoalShiftQueue[ReqQueueEntry],
def getOffsetSlice(addr: UInt) = addr(size - 1, config.wordWidth)
// 2-D table flattened to 1-D
val offsets = io.window.elts.flatMap(_.map(req => getOffsetSlice(req.address)))
val valids = io.window.mask.flatMap(_.asBools)
val valids = chosenMatches.flatMap(_.asBools)
// indicates for each word in the coalesced chunk whether it is accessed by
// any of the requests in the queue. e.g. if [ 1 1 1 1 ], all of the four
// words in the coalesced data coming back will be accessed by some request
@@ -454,7 +454,7 @@ class MultiCoalescer(windowT: CoalShiftQueue[ReqQueueEntry], coalReqT: ReqQueueE
x.zipWithIndex.map {
case (a, b) => (a, b.U)
}.reduce[(UInt, UInt)] { case ((a, i), (b, j)) =>
(Mux(a >= b, a, b), Mux(a >= b, i, j)) // TODO: tie-breaker
(Mux(a > b, a, b), Mux(a > b, i, j)) // > instead of >= here; want to use largest size
}._2
}
@@ -466,7 +466,7 @@ class MultiCoalescer(windowT: CoalShiftQueue[ReqQueueEntry], coalReqT: ReqQueueE
val chosenSizeIdx = Wire(UInt(log2Ceil(config.coalLogSizes.size).W))
val chosenValid = Wire(Bool())
// minimum 25% coverage
val minCoverage = 1.max(1 << ((config.maxCoalLogSize - 2) - 2))
val minCoverage = 1.max(1 << ((config.maxCoalLogSize - config.wordWidth) - 2))
when (normalizedHits.map(_ > minCoverage.U).reduce(_ || _)) {
chosenSizeIdx := argMax(normalizedHits)
@@ -1787,11 +1787,12 @@ class CoalArbiter(config: CoalescerConfig) (implicit p: Parameters) extends Lazy
log2Ceil(config.numOldSrcIds),
config.wordWidth,
log2Ceil(config.wordSizeInBytes)
)
)
val respCoalBundleT = new CoalescedResponseBundle(config)
lazy val module = new CoalArbiterImpl(this, config, nonCoalEntryT, coalEntryT, respNonCoalEntryT, respCoalBundleT)
lazy val module = new CoalArbiterImpl(
this, config, nonCoalEntryT, coalEntryT, respNonCoalEntryT, respCoalBundleT)
}
@@ -1804,7 +1805,7 @@ class CoalArbiterImpl(outer: CoalArbiter,
) extends LazyModuleImp(outer){
val io =IO(new Bundle {
val io = IO(new Bundle {
val nonCoalVec = Vec(config.numLanes, Flipped(Decoupled(nonCoalEntryT.cloneType)))
val coalVec = Vec(config.numCoalReq, Flipped(Decoupled(coalEntryT.cloneType)))
val respNonCoalVec = Vec(config.numLanes, Decoupled(respNonCoalEntryT.cloneType))