riscv/rocket-chip
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multibeat TL; passes all tests

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This commit is contained in:
Henry Cook
2014-12-07 03:09:54 -08:00
parent b7b2923bff
commit 72ea24283b
3 changed files with 52 additions and 113 deletions
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90
rocket/src/main/scala/nbdcache.scala
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@ -191,7 +191,6 @@ class MSHR(id: Int) extends L1HellaCacheModule {
val acquire_type = Reg(UInt())
val release_type = Reg(UInt())
val line_state = Reg(new ClientMetadata()(co))
val refill_count = Reg(UInt(width = log2Up(refillCycles))) // TODO: zero-width wire
val req = Reg(new MSHRReqInternal())
val req_cmd = io.req_bits.cmd
@ -199,9 +198,8 @@ class MSHR(id: Int) extends L1HellaCacheModule {
val idx_match = req_idx === io.req_bits.addr(untagBits-1,blockOffBits)
val sec_rdy = idx_match && (state === s_wb_req || state === s_wb_resp || state === s_meta_clear || (state === s_refill_req || state === s_refill_resp) && !co.needsTransactionOnSecondaryMiss(req_cmd, io.mem_req.bits))
require(isPow2(refillCycles))
val reply = io.mem_grant.valid && io.mem_grant.bits.payload.client_xact_id === UInt(id)
val refill_done = reply && (if(refillCycles > 1) refill_count.andR else Bool(true))
val (refill_cnt, refill_done) = Counter(reply && co.messageUpdatesDataArray(io.mem_grant.bits.payload), refillCycles) // TODO: Zero width?
val wb_done = reply && (state === s_wb_resp)
val meta_on_flush = co.clientMetadataOnFlush
@ -226,7 +224,7 @@ class MSHR(id: Int) extends L1HellaCacheModule {
when (state === s_refill_resp) {
when (refill_done) { state := s_meta_write_req }
when (reply) {
if(refillCycles > 1) refill_count := refill_count + UInt(1)
if(refillCycles > 1) refill_cnt := refill_cnt + UInt(1)
line_state := meta_on_grant
}
}
@ -242,13 +240,12 @@ class MSHR(id: Int) extends L1HellaCacheModule {
when (io.wb_req.fire()) { // s_wb_req
state := s_wb_resp
}
when (io.req_sec_val && io.req_sec_rdy) { // s_wb_req, s_wb_resp, s_refill_req
acquire_type := co.getAcquireTypeOnSecondaryMiss(req_cmd, meta_on_flush, io.mem_req.bits)
}
when (io.req_pri_val && io.req_pri_rdy) {
line_state := meta_on_flush
refill_count := UInt(0)
refill_cnt := UInt(0)
acquire_type := co.getAcquireTypeOnPrimaryMiss(req_cmd, meta_on_flush)
release_type := co.getReleaseTypeOnVoluntaryWriteback() //TODO downgrades etc
req := io.req_bits
@ -276,7 +273,7 @@ class MSHR(id: Int) extends L1HellaCacheModule {
io.idx_match := (state != s_invalid) && idx_match
io.mem_resp := req
io.mem_resp.addr := (if(refillCycles > 1) Cat(req_idx, refill_count) else req_idx) << rowOffBits
io.mem_resp.addr := (if(refillCycles > 1) Cat(req_idx, refill_cnt) else req_idx) << rowOffBits
io.tag := req.addr >> untagBits
io.req_pri_rdy := state === s_invalid
io.req_sec_rdy := sec_rdy && rpq.io.enq.ready
@ -351,7 +348,7 @@ class MSHRFile extends L1HellaCacheModule {
val memRespMux = Vec.fill(params(NMSHRs)){new DataWriteReq}
val meta_read_arb = Module(new Arbiter(new L1MetaReadReq, params(NMSHRs)))
val meta_write_arb = Module(new Arbiter(new L1MetaWriteReq, params(NMSHRs)))
val mem_req_arb = Module(new Arbiter(new Acquire, params(NMSHRs)))
val mem_req_arb = Module(new LockingArbiter(new Acquire, params(NMSHRs), outerDataBeats, co.messageHasData _))
val mem_finish_arb = Module(new Arbiter(new LogicalNetworkIO(new Finish), params(NMSHRs)))
val wb_req_arb = Module(new Arbiter(new WritebackReq, params(NMSHRs)))
val replay_arb = Module(new Arbiter(new ReplayInternal, params(NMSHRs)))
@ -430,7 +427,9 @@ class WritebackUnit extends L1HellaCacheModule {
val active = Reg(init=Bool(false))
val r1_data_req_fired = Reg(init=Bool(false))
val r2_data_req_fired = Reg(init=Bool(false))
val cnt = Reg(init = UInt(0, width = log2Up(refillCycles+1)))
val cnt = Reg(init = UInt(0, width = log2Up(refillCycles+1))) //TODO Zero width
val buf_v = (if(refillCyclesPerBeat > 1) Reg(init=Bits(0, width = refillCyclesPerBeat-1)) else Bits(1))
val beat_done = buf_v.andR
val req = Reg(new WritebackReq)
io.release.valid := false
@ -441,27 +440,22 @@ class WritebackUnit extends L1HellaCacheModule {
r1_data_req_fired := true
cnt := cnt + 1
}
if(refillCycles > 1) { // Coalescing buffer inserted
when (!r1_data_req_fired && !r2_data_req_fired && cnt === refillCycles) {
io.release.valid := true
active := !io.release.ready
}
} else { // No buffer, data released a cycle earlier
when (r2_data_req_fired) {
io.release.valid := true
when(!io.release.ready) {
r1_data_req_fired := false
r2_data_req_fired := false
cnt := UInt(0)
} .otherwise {
active := false
}
when (r2_data_req_fired) {
io.release.valid := beat_done
when(!io.release.ready) {
r1_data_req_fired := false
r2_data_req_fired := false
cnt := cnt - Mux[UInt](Bool(refillCycles > 1) && r1_data_req_fired, 2, 1)
} .elsewhen(beat_done) { if(refillCyclesPerBeat > 1) buf_v := 0 }
when(!r1_data_req_fired) {
active := cnt < UInt(refillCycles)
}
}
}
when (io.req.fire()) {
active := true
cnt := 0
if(refillCyclesPerBeat > 1) buf_v := 0
req := io.req.bits
}
@ -475,25 +469,23 @@ class WritebackUnit extends L1HellaCacheModule {
io.data_req.valid := fire
io.data_req.bits.way_en := req.way_en
if(refillCycles > 1) {
io.data_req.bits.addr := Cat(req.idx, cnt(log2Up(refillCycles)-1,0)) << rowOffBits
} else {
io.data_req.bits.addr := req.idx << rowOffBits
}
io.data_req.bits.addr := (if(refillCycles > 1) Cat(req.idx, cnt(log2Up(refillCycles)-1,0))
else req.idx) << rowOffBits
io.release.bits.r_type := req.r_type
io.release.bits.addr := Cat(req.tag, req.idx).toUInt
io.release.bits.client_xact_id := req.client_xact_id
if(refillCycles > 1) {
val data_buf = Reg(Bits())
when(active && r2_data_req_fired) {
data_buf := Cat(io.data_resp, data_buf(refillCycles*encRowBits-1, encRowBits))
}
io.release.bits.data := data_buf
} else {
io.release.bits.data := io.data_resp
}
io.release.bits.data :=
(if(refillCyclesPerBeat > 1) {
val data_buf = Reg(Bits())
when(active && r2_data_req_fired && !beat_done) {
data_buf := Cat(io.data_resp, data_buf((refillCyclesPerBeat-1)*encRowBits-1, encRowBits))
buf_v := (if(refillCyclesPerBeat > 2)
Cat(UInt(1), buf_v(refillCyclesPerBeat-2,1))
else UInt(1))
}
Cat(io.data_resp, data_buf)
} else { io.data_resp })
}
class ProbeUnit extends L1HellaCacheModule {
@ -551,8 +543,12 @@ class ProbeUnit extends L1HellaCacheModule {
}
io.req.ready := state === s_invalid
io.rep.valid := state === s_release && !(hit && co.needsWriteback(line_state))
io.rep.bits := Release(co.getReleaseTypeOnProbe(req, Mux(hit, line_state, co.clientMetadataOnFlush)), req.addr, req.client_xact_id)
io.rep.valid := state === s_release &&
!(hit && co.needsWriteback(line_state)) // Otherwise WBU will issue release
io.rep.bits := Release(co.getReleaseTypeOnProbe(req,
Mux(hit, line_state, co.clientMetadataOnFlush)),
req.addr,
req.client_xact_id)
io.meta_read.valid := state === s_meta_read
io.meta_read.bits.idx := req.addr
@ -878,8 +874,8 @@ class HellaCache extends L1HellaCacheModule {
metaReadArb.io.in(1) <> mshrs.io.meta_read
metaWriteArb.io.in(0) <> mshrs.io.meta_write
// probes
val releaseArb = Module(new Arbiter(new Release, 2))
// probes and releases
val releaseArb = Module(new LockingArbiter(new Release, 2, outerDataBeats, co.messageHasData _))
DecoupledLogicalNetworkIOWrapper(releaseArb.io.out) <> io.mem.release
val probe = DecoupledLogicalNetworkIOUnwrapper(io.mem.probe)
@ -895,11 +891,9 @@ class HellaCache extends L1HellaCacheModule {
// refills
def doRefill(g: Grant): Bool = co.messageUpdatesDataArray(g)
val refill = if(refillCycles > 1) {
val ser = Module(new FlowThroughSerializer(io.mem.grant.bits, refillCycles, doRefill))
ser.io.in <> io.mem.grant
ser.io.out
} else io.mem.grant
val ser = Module(new FlowThroughSerializer(io.mem.grant.bits, refillCyclesPerBeat, doRefill))
ser.io.in <> io.mem.grant
val refill = ser.io.out
mshrs.io.mem_grant.valid := refill.fire()
mshrs.io.mem_grant.bits := refill.bits
refill.ready := writeArb.io.in(1).ready || !doRefill(refill.bits.payload)