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tilelink2 Monitor: detect if sources are mishandled

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This commit is contained in:
Wesley W. Terpstra 2016-09-20 19:09:48 -07:00
parent 3f3defb130
commit 69a1f8cd1f
1 changed files with 31 additions and 1 deletions
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32
src/main/scala/uncore/tilelink2/Monitor.scala
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@ -422,10 +422,40 @@ object TLMonitor
legalizeIrrevocable(bundle.e, edge)
}
def legalizeSourceUnique(bundle: TLBundle, edge: TLEdge)(implicit sourceInfo: SourceInfo) {
val inflight = RegInit(Vec.fill(edge.client.endSourceId)(Bool(false)))
val a_counter = RegInit(UInt(0, width = log2Up(edge.maxTransfer)))
val a_beats1 = edge.numBeats1(bundle.a.bits)
val a_first = a_counter === UInt(0)
val a_last = a_counter === UInt(1) || a_beats1 === UInt(0)
val d_counter = RegInit(UInt(0, width = log2Up(edge.maxTransfer)))
val d_beats1 = edge.numBeats1(bundle.d.bits)
val d_first = d_counter === UInt(0)
val d_last = d_counter === UInt(1) || d_beats1 === UInt(0)
val bypass = bundle.a.bits.source === bundle.d.bits.source
val a_bypass = bypass && bundle.d.valid && d_last
val d_bypass = bypass && bundle.a.valid && a_last
when (bundle.a.fire()) {
a_counter := Mux(a_first, a_beats1, a_counter - UInt(1))
when (a_last) { inflight(bundle.a.bits.source) := Bool(true) }
assert(a_bypass || !inflight(bundle.a.bits.source), "'A' channel re-used a source ID" + extra)
}
when (bundle.d.fire() && bundle.d.bits.opcode =/= TLMessages.ReleaseAck) {
d_counter := Mux(d_first, d_beats1, d_counter - UInt(1))
when (d_last) { inflight(bundle.d.bits.source) := Bool(false) }
assert(d_bypass || inflight(bundle.d.bits.source), "'D' channel acknowledged for nothing inflight" + extra)
}
}
def legalize(bundle: TLBundle, edge: TLEdge)(implicit sourceInfo: SourceInfo) {
legalizeFormat (bundle, edge)
legalizeMultibeat (bundle, edge)
legalizeIrrevocable(bundle, edge)
// !!! validate source uniqueness
legalizeSourceUnique(bundle, edge)
}
}