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TLBroadcast: support non-FIFO devices (#482)

This commit is contained in:
Wesley W. Terpstra 2016-12-05 22:10:37 -08:00 committed by Henry Cook
parent 3c9718ec8f
commit fbfa15efea
1 changed files with 14 additions and 8 deletions
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22
src/main/scala/uncore/tilelink2/Broadcast.scala
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@ -87,6 +87,8 @@ class TLBroadcast(lineBytes: Int, numTrackers: Int = 4, bufferless: Boolean = fa
val d_normal = Wire(in.d)
val d_trackerOH = Vec(trackers.map { t => !t.idle && t.source === d_normal.bits.source }).asUInt
assert (!out.d.valid || !d_drop || out.d.bits.opcode === TLMessages.AccessAck)
out.d.ready := d_normal.ready || d_drop
d_normal.valid := out.d.valid && !d_drop
d_normal.bits := out.d.bits // truncates source
@ -102,6 +104,7 @@ class TLBroadcast(lineBytes: Int, numTrackers: Int = 4, bufferless: Boolean = fa
val d_last = edgeIn.last(d_normal)
(trackers zip d_trackerOH.toBools) foreach { case (tracker, select) =>
tracker.d_last := select && d_normal.fire() && d_response && d_last
tracker.probedack := select && out.d.fire() && d_drop
}
// Incoming C can be:
@ -114,12 +117,12 @@ class TLBroadcast(lineBytes: Int, numTrackers: Int = 4, bufferless: Boolean = fa
val c_probeackdata = in.c.bits.opcode === TLMessages.ProbeAckData
val c_releasedata = in.c.bits.opcode === TLMessages.ReleaseData
val c_release = in.c.bits.opcode === TLMessages.Release
val c_trackerOH = trackers.map { t => t.line === (in.c.bits.address >> lineShift) }
val c_trackerSrc = Mux1H(c_trackerOH, trackers.map { _.source })
// Decrement the tracker's outstanding probe counter
val c_decrement = in.c.fire() && (c_probeack || c_probeackdata)
val c_last = edgeIn.last(in.c)
trackers foreach { tracker =>
tracker.probeack := c_decrement && c_last && tracker.line === (in.c.bits.address >> lineShift)
(trackers zip c_trackerOH) foreach { case (tracker, select) =>
tracker.probenack := in.c.fire() && c_probeack && select
}
val releaseack = Wire(in.d)
@ -131,8 +134,9 @@ class TLBroadcast(lineBytes: Int, numTrackers: Int = 4, bufferless: Boolean = fa
releaseack.bits := edgeIn.ReleaseAck(in.c.bits.address, UInt(0), in.c.bits.source, in.c.bits.size)
val put_what = Mux(c_releasedata, TRANSFORM_B, DROP)
val put_who = Mux(c_releasedata, in.c.bits.source, c_trackerSrc)
putfull.valid := in.c.valid && (c_probeackdata || c_releasedata)
putfull.bits := edgeOut.Put(Cat(put_what, in.c.bits.source), in.c.bits.address, in.c.bits.size, in.c.bits.data)._2
putfull.bits := edgeOut.Put(Cat(put_what, put_who), in.c.bits.address, in.c.bits.size, in.c.bits.data)._2
// Combine ReleaseAck or the modified D
TLArbiter.lowest(edgeOut, in.d, releaseack, d_normal)
@ -207,7 +211,8 @@ class TLBroadcastTracker(id: Int, lineBytes: Int, probeCountBits: Int, bufferles
val in_a = Decoupled(new TLBundleA(edgeIn.bundle)).flip
val out_a = Decoupled(new TLBundleA(edgeOut.bundle))
val probe = UInt(INPUT, width = probeCountBits)
val probeack = Bool(INPUT)
val probenack = Bool(INPUT)
val probedack = Bool(INPUT)
val d_last = Bool(INPUT)
val e_last = Bool(INPUT)
val source = UInt(OUTPUT) // the source awaiting D response
@ -246,9 +251,10 @@ class TLBroadcastTracker(id: Int, lineBytes: Int, probeCountBits: Int, bufferles
assert (!idle)
idle := Bool(true)
}
when (io.probeack) {
when (io.probenack || io.probedack) {
assert (count > UInt(0))
count := count - UInt(1)
count := count - Mux(io.probenack && io.probedack, UInt(2), UInt(1))
}
io.idle := idle