riscv/rocket-chip
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Filled out 4 state coherence functions for cache

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This commit is contained in:
Henry Cook 2012-03-02 21:58:50 -08:00
parent 00989c58bd
commit 35f97bf858
2 changed files with 27 additions and 19 deletions
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44
rocket/src/main/scala/coherence.scala
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@ -156,16 +156,26 @@ trait FourStateCoherence extends CoherencePolicy {
def newStateOnWriteback() = tileInvalid
def newStateOnFlush() = tileInvalid
def newStateOnHit(cmd: Bits, state: UFix): UFix = {
val (read, write) = cpuCmdToRW(cmd)
Mux(write, tileExclusiveDirty, state)
}
def newStateOnTransactionRep(incoming: TransactionReply, outstanding: TransactionInit): UFix = {
MuxLookup(incoming.t_type, tileInvalid, Array(
X_READ_SHARED -> tileShared,
X_READ_EXCLUSIVE -> Mux(outstanding.t_type === X_READ_EXCLUSIVE, tileExclusiveDirty, tileExclusiveClean),
X_READ_EXCLUSIVE_ACK -> tileExclusiveDirty,
X_READ_UNCACHED -> tileInvalid,
X_WRITE_UNCACHED -> tileInvalid
))
}
def needsSecondaryXact(cmd: Bits, outstanding: TransactionInit): Bool = {
val (read, write) = cpuCmdToRW(cmd)
(read && (outstanding.t_type === X_READ_UNCACHED || outstanding.t_type === X_WRITE_UNCACHED)) ||
(write && (outstanding.t_type != X_READ_EXCLUSIVE))
}
// TODO: New funcs as compared to incoherent protocol:
def newState(cmd: Bits, state: UFix): UFix
def newStateOnHit(cmd: Bits, state: UFix): UFix
def newStateOnPrimaryMiss(cmd: Bits): UFix
def newStateOnSecondaryMiss(cmd: Bits, state: UFix): UFix
def needsSecondaryXact (cmd: Bits, outstanding: TransactionInit): Bool
def newStateOnProbe (incoming: ProbeRequest, state: UFix): Bits = {
def newStateOnProbeReq(incoming: ProbeRequest, state: UFix): Bits = {
MuxLookup(incoming.p_type, state, Array(
probeInvalidate -> tileInvalid,
probeDowngrade -> tileShared,
@ -174,26 +184,26 @@ trait FourStateCoherence extends CoherencePolicy {
}
def replyTypeHasData (reply: TransactionReply): Bool = {
(reply.t_type != X_WRITE_UNCACHED)
(reply.t_type != X_WRITE_UNCACHED && reply.t_type != X_READ_EXCLUSIVE_ACK)
}
}
class XactTracker(id: Int) extends Component with CoherencePolicy {
val io = new Bundle {
val alloc_req = (new ioDecoupled) { new TrackerAllocReq() }.flip
val p_data = (new ioPipe) { new TrackerProbeData() }
val alloc_req = (new ioDecoupled) { new TrackerAllocReq }.flip
val p_data = (new ioPipe) { new TrackerProbeData }
val can_alloc = Bool(INPUT)
val xact_finish = Bool(INPUT)
val p_rep_cnt_dec = Bits(NTILES, INPUT)
val p_req_cnt_inc = Bits(NTILES, INPUT)
val p_rep_data = (new ioDecoupled) { new ProbeReplyData() }.flip
val x_init_data = (new ioDecoupled) { new TransactionInitData() }.flip
val p_rep_data = (new ioDecoupled) { new ProbeReplyData }.flip
val x_init_data = (new ioDecoupled) { new TransactionInitData }.flip
val sent_x_rep_ack = Bool(INPUT)
val mem_req_cmd = (new ioDecoupled) { new MemReqCmd() }
val mem_req_data = (new ioDecoupled) { new MemData() }
val mem_req_cmd = (new ioDecoupled) { new MemReqCmd }
val mem_req_data = (new ioDecoupled) { new MemData }
val mem_req_lock = Bool(OUTPUT)
val probe_req = (new ioDecoupled) { new ProbeRequest() }
val probe_req = (new ioDecoupled) { new ProbeRequest }
val busy = Bool(OUTPUT)
val addr = Bits(PADDR_BITS, OUTPUT)
val init_tile_id = Bits(TILE_ID_BITS, OUTPUT)

2
rocket/src/main/scala/nbdcache.scala
View File

@ -605,8 +605,6 @@ abstract class HellaCache extends Component {
def newStateOnWriteback(): UFix
def newStateOnFlush(): UFix
def newStateOnHit(cmd: Bits, state: UFix): UFix
def newStateOnPrimaryMiss(cmd: Bits): UFix
def newStateOnSecondaryMiss(cmd: Bits, state: UFix): UFix
}
class HellaCacheUniproc extends HellaCache with ThreeStateIncoherence {