change D$ to use FourStateCoherence protocol
instead of ThreeStateIncoherence.
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@ -121,17 +121,18 @@ trait ThreeStateIncoherence extends CoherencePolicy {
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Mux(write, tileDirty, Mux(read, Mux(state === tileDirty, tileDirty, tileClean), state))
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}
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def newStateOnHit(cmd: Bits, state: UFix): UFix = newState(cmd, state)
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def newStateOnPrimaryMiss(cmd: Bits): UFix = newState(cmd, tileInvalid)
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def newStateOnSecondaryMiss(cmd: Bits, state: UFix): UFix = {
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def newTransactionOnPrimaryMiss(cmd: Bits, state: UFix): UFix = {
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val (read, write) = cpuCmdToRW(cmd)
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Mux(write, tileDirty, state)
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Mux(write, X_INIT_READ_EXCLUSIVE, X_INIT_READ_SHARED)
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}
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def newTransactionOnMiss(cmd: Bits, state: UFix): UFix = X_INIT_READ_EXCLUSIVE
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def newStateOnTransactionRep(cmd: Bits, incoming: TransactionReply, outstanding: TransactionInit): UFix = {
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def newTransactionOnSecondaryMiss(cmd: Bits, state: UFix, outstanding: TransactionInit): UFix = {
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val (read, write) = cpuCmdToRW(cmd)
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Mux(write, tileDirty, tileClean)
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}
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Mux(write, X_INIT_READ_EXCLUSIVE, outstanding.t_type)
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}
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def needsSecondaryXact(cmd: Bits, outstanding: TransactionInit): Bool = Bool(false)
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def newStateOnTransactionRep(incoming: TransactionReply, outstanding: TransactionInit): UFix = {
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Mux(outstanding.t_type === X_INIT_READ_EXCLUSIVE, tileDirty, tileClean)
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}
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def newStateOnProbeReq(incoming: ProbeRequest, state: UFix): Bits = state
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def probeReplyHasData (reply: ProbeReply): Bool = Bool(false)
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def transactionInitHasData (init: TransactionInit): Bool = (init.t_type != X_INIT_WRITE_UNCACHED)
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@ -166,11 +167,20 @@ trait FourStateCoherence extends CoherencePolicy {
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val (read, write) = cpuCmdToRW(cmd)
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Mux(write, tileExclusiveDirty, state)
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}
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def newTransactionOnMiss(cmd: Bits, state: UFix): UFix = {
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def newTransactionOnPrimaryMiss(cmd: Bits, state: UFix): UFix = {
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val (read, write) = cpuCmdToRW(cmd)
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Mux(write, X_INIT_READ_EXCLUSIVE, X_INIT_READ_SHARED)
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}
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def newStateOnTransactionRep(cmd: Bits, incoming: TransactionReply, outstanding: TransactionInit): UFix = {
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def newTransactionOnSecondaryMiss(cmd: Bits, state: UFix, outstanding: TransactionInit): UFix = {
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val (read, write) = cpuCmdToRW(cmd)
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Mux(write, X_INIT_READ_EXCLUSIVE, outstanding.t_type)
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}
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def needsSecondaryXact(cmd: Bits, outstanding: TransactionInit): Bool = {
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val (read, write) = cpuCmdToRW(cmd)
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(read && (outstanding.t_type === X_INIT_READ_UNCACHED || outstanding.t_type === X_INIT_WRITE_UNCACHED)) ||
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(write && (outstanding.t_type != X_INIT_READ_EXCLUSIVE))
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}
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def newStateOnTransactionRep(incoming: TransactionReply, outstanding: TransactionInit): UFix = {
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MuxLookup(incoming.t_type, tileInvalid, Array(
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X_REP_READ_SHARED -> tileShared,
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X_REP_READ_EXCLUSIVE -> Mux(outstanding.t_type === X_INIT_READ_EXCLUSIVE, tileExclusiveDirty, tileExclusiveClean),
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@ -179,11 +189,6 @@ trait FourStateCoherence extends CoherencePolicy {
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X_REP_WRITE_UNCACHED -> tileInvalid
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))
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}
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def needsSecondaryXact(cmd: Bits, outstanding: TransactionInit): Bool = {
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val (read, write) = cpuCmdToRW(cmd)
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(read && (outstanding.t_type === X_INIT_READ_UNCACHED || outstanding.t_type === X_INIT_WRITE_UNCACHED)) ||
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(write && (outstanding.t_type != X_INIT_READ_EXCLUSIVE))
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}
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def newStateOnProbeReq(incoming: ProbeRequest, state: UFix): Bits = {
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MuxLookup(incoming.p_type, state, Array(
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@ -163,7 +163,7 @@ class MetaArrayArrayReq extends Bundle {
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val way_en = Bits(width = NWAYS)
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}
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class MSHR(id: Int) extends Component with ThreeStateIncoherence {
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class MSHR(id: Int) extends Component with FourStateCoherence {
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val io = new Bundle {
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val req_pri_val = Bool(INPUT)
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val req_pri_rdy = Bool(OUTPUT)
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@ -187,6 +187,7 @@ class MSHR(id: Int) extends Component with ThreeStateIncoherence {
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}
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val valid = Reg(resetVal = Bool(false))
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val xact_type = Reg { UFix() }
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val state = Reg { UFix() }
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val requested = Reg { Bool() }
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val refilled = Reg { Bool() }
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@ -196,10 +197,8 @@ class MSHR(id: Int) extends Component with ThreeStateIncoherence {
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val way_oh_ = Reg { Bits() }
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val req_cmd = io.req_bits.cmd
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val req_load = (req_cmd === M_XRD) || (req_cmd === M_PFR)
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val req_use_rpq = (req_cmd != M_PFR) && (req_cmd != M_PFW)
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val next_state = Mux(io.req_sec_val && io.req_sec_rdy, newStateOnSecondaryMiss(req_cmd, state), state)
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val sec_rdy = io.idx_match && !refilled && (needsWriteback(state) || !requested || req_load)
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val sec_rdy = io.idx_match && !refilled && !((requested || io.mem_req.ready) && needsSecondaryXact(req_cmd, io.mem_req.bits))
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val rpq = (new queue(NRPQ)) { new RPQEntry }
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rpq.io.enq.valid := (io.req_pri_val && io.req_pri_rdy || io.req_sec_val && sec_rdy) && req_use_rpq
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@ -213,9 +212,28 @@ class MSHR(id: Int) extends Component with ThreeStateIncoherence {
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finish_q.io.enq.valid := refill_done
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finish_q.io.enq.bits := io.mem_rep.bits.global_xact_id
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when (io.mem_req.valid && io.mem_req.ready) {
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requested := Bool(true)
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}
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when (io.mem_abort.valid && io.mem_abort.bits.tile_xact_id === UFix(id)) {
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requested := Bool(false)
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}
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when (io.mem_rep.valid && io.mem_rep.bits.tile_xact_id === UFix(id)) {
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refill_count := refill_count + UFix(1)
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state := newStateOnTransactionRep(io.mem_rep.bits, io.mem_req.bits)
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}
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when (refill_done) {
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refilled := Bool(true)
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}
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when (io.meta_req.valid && io.meta_req.ready) {
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valid := Bool(false)
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}
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when (io.req_sec_val && io.req_sec_rdy) {
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xact_type := newTransactionOnSecondaryMiss(req_cmd, newStateOnFlush(), io.mem_req.bits)
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}
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when (io.req_pri_val && io.req_pri_rdy) {
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valid := Bool(true)
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state := newStateOnPrimaryMiss(req_cmd)
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xact_type := newTransactionOnPrimaryMiss(req_cmd, newStateOnFlush())
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requested := Bool(false)
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refilled := Bool(false)
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refill_count := UFix(0)
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@ -223,24 +241,6 @@ class MSHR(id: Int) extends Component with ThreeStateIncoherence {
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idx_ := io.req_bits.idx
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way_oh_ := io.req_bits.way_oh
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}
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.otherwise {
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when (io.mem_req.valid && io.mem_req.ready) {
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requested := Bool(true)
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}
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when (io.mem_abort.valid && io.mem_abort.bits.tile_xact_id === UFix(id)) {
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requested := Bool(false)
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}
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when (io.mem_rep.valid && io.mem_rep.bits.tile_xact_id === UFix(id)) {
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refill_count := refill_count + UFix(1)
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}
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when (refill_done) {
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refilled := Bool(true)
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}
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when (io.meta_req.valid && io.meta_req.ready) {
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valid := Bool(false)
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}
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state := next_state
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}
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io.idx_match := valid && (idx_ === io.req_bits.idx)
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io.idx := idx_
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@ -258,7 +258,7 @@ class MSHR(id: Int) extends Component with ThreeStateIncoherence {
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io.meta_req.bits.way_en := way_oh_
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io.mem_req.valid := valid && !requested
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io.mem_req.bits.t_type := Mux(needsWriteback(next_state), X_INIT_READ_EXCLUSIVE, X_INIT_READ_SHARED)
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io.mem_req.bits.t_type := xact_type
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io.mem_req.bits.address := Cat(ppn, idx_).toUFix
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io.mem_req.bits.tile_xact_id := Bits(id)
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io.mem_finish <> finish_q.io.deq
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@ -449,7 +449,7 @@ class WritebackUnit extends Component {
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io.mem_finish <> finish_q.io.deq
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}
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class FlushUnit(lines: Int) extends Component with ThreeStateIncoherence{
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class FlushUnit(lines: Int) extends Component with FourStateCoherence{
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val io = new Bundle {
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val req = (new ioDecoupled) { Bits(width = DCACHE_TAG_BITS) }.flip
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val resp = (new ioDecoupled) { Bits(width = DCACHE_TAG_BITS) }
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@ -667,7 +667,7 @@ abstract class HellaCache extends Component {
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def newStateOnHit(cmd: Bits, state: UFix): UFix
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}
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class HellaCacheUniproc extends HellaCache with ThreeStateIncoherence {
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class HellaCacheUniproc extends HellaCache with FourStateCoherence {
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val io = new Bundle {
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val cpu = new ioDmem()
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val mem = new ioTileLink
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