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tilelink2 SourceShrinker: handle degenerate cases for free

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This commit is contained in:
Wesley W. Terpstra 2016-11-22 22:01:43 -08:00
parent 1e7d597fd3
commit 1d3cad3671
1 changed files with 30 additions and 23 deletions
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7
src/main/scala/uncore/tilelink2/SourceShrinker.scala
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@ -9,6 +9,8 @@ import scala.math.{min,max}
class TLSourceShrinker(maxInFlight: Int) extends LazyModule
{
require (maxInFlight > 0)
private val client = TLClientParameters(sourceId = IdRange(0, maxInFlight))
val node = TLAdapterNode(
// We erase all client information since we crush the source Ids
@ -37,6 +39,10 @@ class TLSourceShrinker(maxInFlight: Int) extends LazyModule
in.c.ready := Bool(true)
in.e.ready := Bool(true)
if (maxInFlight >= edgeIn.client.endSourceId) {
out.a <> in.a
in.d <> out.d
} else {
// State tracking
val sourceIdMap = Mem(maxInFlight, in.a.bits.source)
val allocated = RegInit(UInt(0, width = maxInFlight))
@ -66,6 +72,7 @@ class TLSourceShrinker(maxInFlight: Int) extends LazyModule
val free_id = Mux(free, UIntToOH(out.d.bits.source), UInt(0))
allocated := (allocated | alloc_id) & ~free_id
}
}
}
object TLSourceShrinker