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fix ID mapper to disallow two in-flight requests with the same inner ID

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This commit is contained in:
Howard Mao 2016-07-05 17:19:35 -07:00
parent af76837970
commit b105076996
1 changed files with 35 additions and 40 deletions
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73
uncore/src/main/scala/converters/Nasti.scala
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@ -6,8 +6,10 @@ import uncore.tilelink._
import uncore.constants._
import cde.Parameters
class IdMapper(val inIdBits: Int, val outIdBits: Int)
class IdMapper(val inIdBits: Int, val outIdBits: Int,
val forceMapping: Boolean = false)
(implicit val p: Parameters) extends Module {
val io = new Bundle {
val req = new Bundle {
val valid = Bool(INPUT)
@ -18,51 +20,44 @@ class IdMapper(val inIdBits: Int, val outIdBits: Int)
val resp = new Bundle {
val valid = Bool(INPUT)
val matches = Bool(OUTPUT)
val out_id = UInt(INPUT, inIdBits)
val in_id = UInt(OUTPUT, outIdBits)
val out_id = UInt(INPUT, outIdBits)
val in_id = UInt(OUTPUT, inIdBits)
}
}
val maxInXacts = 1 << inIdBits
if (inIdBits <= outIdBits) {
if (inIdBits <= outIdBits && !forceMapping) {
io.req.ready := Bool(true)
io.req.out_id := io.req.in_id
io.resp.matches := Bool(true)
io.resp.in_id := io.resp.out_id
} else if (outIdBits <= 2) {
val nQueues = 1 << outIdBits
val entriesPerQueue = (maxInXacts - 1) / nQueues + 1
val (req_out_id, req_out_flip) = Counter(io.req.valid && io.req.ready, nQueues)
io.req.ready := Bool(false)
io.resp.matches := Bool(false)
io.resp.in_id := UInt(0)
io.req.out_id := req_out_id
for (i <- 0 until nQueues) {
val queue = Module(new Queue(UInt(width = inIdBits), entriesPerQueue))
queue.io.enq.valid := io.req.valid && req_out_id === UInt(i)
queue.io.enq.bits := io.req.in_id
when (req_out_id === UInt(i)) { io.req.ready := queue.io.enq.ready }
queue.io.deq.ready := io.resp.valid && io.resp.out_id === UInt(i)
when (io.resp.out_id === UInt(i)) {
io.resp.matches := queue.io.deq.valid
io.resp.in_id := queue.io.deq.bits
}
}
} else {
val maxOutId = 1 << outIdBits
val (req_out_id, req_nasti_flip) = Counter(io.req.valid && io.req.ready, maxOutId)
val roq = Module(new ReorderQueue(
UInt(width = inIdBits), outIdBits, maxInXacts))
roq.io.enq.valid := io.req.valid
roq.io.enq.bits.data := io.req.in_id
roq.io.enq.bits.tag := req_out_id
io.req.ready := roq.io.enq.ready
io.req.out_id := req_out_id
roq.io.deq.valid := io.resp.valid
roq.io.deq.tag := io.resp.out_id
io.resp.in_id := roq.io.deq.data
io.resp.matches := roq.io.deq.matches
val nInXacts = 1 << inIdBits
val nOutXacts = 1 << outIdBits
val out_id_free = Reg(init = Vec.fill(nOutXacts){Bool(true)})
val next_out_id = PriorityEncoder(out_id_free)
val id_mapping = Reg(Vec(nInXacts, UInt(0, outIdBits)))
val id_valid = Reg(init = Vec.fill(nOutXacts){Bool(false)})
val req_fire = io.req.valid && io.req.ready
when (req_fire) {
out_id_free(io.req.out_id) := Bool(false)
id_valid(io.req.in_id) := Bool(true)
id_mapping(io.req.in_id) := io.req.out_id
}
when (io.resp.valid) {
out_id_free(io.resp.out_id) := Bool(true)
id_valid(io.resp.in_id) := Bool(false)
}
io.req.ready := out_id_free.reduce(_ || _) && !id_valid(io.req.in_id)
io.req.out_id := next_out_id
val id_matches = id_mapping.map(_ === io.resp.out_id)
val id_matches_valid = id_matches.zip(id_valid).map { case (m, v) => m && v }
io.resp.matches := id_matches_valid.reduce(_ || _)
io.resp.in_id := PriorityEncoder(id_matches_valid)
}
}
@ -309,8 +304,8 @@ class TileLinkIONastiIOConverter(implicit p: Parameters) extends TLModule()(p)
"NASTI write transaction cannot convert to TileLInk")
val put_count = Reg(init = UInt(0, tlBeatAddrBits))
val get_id_mapper = Module(new IdMapper(nastiXIdBits, tlClientXactIdBits))
val put_id_mapper = Module(new IdMapper(nastiXIdBits, tlClientXactIdBits))
val get_id_mapper = Module(new IdMapper(nastiXIdBits, tlClientXactIdBits, true))
val put_id_mapper = Module(new IdMapper(nastiXIdBits, tlClientXactIdBits, true))
when (io.nasti.aw.fire()) {
aw_req := io.nasti.aw.bits