riscv/rocket-chip
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Prep in HellaCache for extracting MetaData to uncore

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This commit is contained in:
Henry Cook
2014-04-23 15:43:31 -07:00
parent 5c62cff2ce
commit f4d326b8d7
1 changed files with 23 additions and 16 deletions
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39
rocket/src/main/scala/nbdcache.scala
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@@ -45,6 +45,7 @@ case class DCacheConfig(val sets: Int, val ways: Int,
require(isPow2(ways)) // TODO: relax this
require(rowbits <= tl.dataBits)
require(lineaddrbits == tl.addrBits)
require(untagbits <= pgidxbits)
}
abstract trait DCacheBundle extends Bundle {
@@ -135,15 +136,18 @@ class MetaData(implicit val conf: DCacheConfig) extends DCacheBundle {
}
class MetaReadReq(implicit val conf: DCacheConfig) extends DCacheBundle {
val addr = UInt(width = conf.paddrbits)
val idx = Bits(width = conf.idxbits)
}
class MetaWriteReq(implicit val conf: DCacheConfig) extends DCacheBundle {
class MetaWriteReq(implicit conf: DCacheConfig) extends MetaReadReq()(conf) {
val way_en = Bits(width = conf.ways)
val idx = Bits(width = conf.idxbits)
val data = new MetaData()
}
class L1MetaReadReq(implicit conf: DCacheConfig) extends MetaReadReq()(conf) {
val tag = Bits(width = conf.tagbits)
}
class MSHR(id: Int)(implicit conf: DCacheConfig) extends Module {
implicit val (tl, ln) = (conf.tl, conf.tl.ln)
val io = new Bundle {
@@ -159,7 +163,7 @@ class MSHR(id: Int)(implicit conf: DCacheConfig) extends Module {
val mem_req = Decoupled(new Acquire)
val mem_resp = new DataWriteReq().asOutput
val meta_read = Decoupled(new MetaReadReq)
val meta_read = Decoupled(new L1MetaReadReq)
val meta_write = Decoupled(new MetaWriteReq)
val replay = Decoupled(new Replay)
val mem_grant = Valid(new LogicalNetworkIO(new Grant)).flip
@@ -287,7 +291,8 @@ class MSHR(id: Int)(implicit conf: DCacheConfig) extends Module {
io.mem_finish <> ackq.io.deq
io.meta_read.valid := state === s_drain_rpq
io.meta_read.bits.addr := io.mem_req.bits.addr << conf.offbits
io.meta_read.bits.idx := req_idx
io.meta_read.bits.tag := io.tag
io.replay.valid := state === s_drain_rpq && rpq.io.deq.valid
io.replay.bits := rpq.io.deq.bits
@@ -308,7 +313,7 @@ class MSHRFile(implicit conf: DCacheConfig) extends Module {
val mem_req = Decoupled(new Acquire)
val mem_resp = new DataWriteReq().asOutput
val meta_read = Decoupled(new MetaReadReq)
val meta_read = Decoupled(new L1MetaReadReq)
val meta_write = Decoupled(new MetaWriteReq)
val replay = Decoupled(new Replay)
val mem_grant = Valid(new LogicalNetworkIO(new Grant)).flip
@@ -332,7 +337,7 @@ class MSHRFile(implicit conf: DCacheConfig) extends Module {
val wbTagList = Vec.fill(conf.nmshr){Bits()}
val memRespMux = Vec.fill(conf.nmshr){new DataWriteReq}
val meta_read_arb = Module(new Arbiter(new MetaReadReq, conf.nmshr))
val meta_read_arb = Module(new Arbiter(new L1MetaReadReq, conf.nmshr))
val meta_write_arb = Module(new Arbiter(new MetaWriteReq, conf.nmshr))
val mem_req_arb = Module(new Arbiter(new Acquire, conf.nmshr))
val mem_finish_arb = Module(new Arbiter(new LogicalNetworkIO(new GrantAck), conf.nmshr))
@@ -406,7 +411,7 @@ class WritebackUnit(implicit conf: DCacheConfig) extends Module {
implicit val tl = conf.tl
val io = new Bundle {
val req = Decoupled(new WritebackReq()).flip
val meta_read = Decoupled(new MetaReadReq)
val meta_read = Decoupled(new L1MetaReadReq)
val data_req = Decoupled(new DataReadReq())
val data_resp = Bits(INPUT, conf.encrowbits)
val release = Decoupled(new Release)
@@ -455,7 +460,8 @@ class WritebackUnit(implicit conf: DCacheConfig) extends Module {
// We reissue the meta read as it sets up the muxing for s2_data_muxed
io.meta_read.valid := fire
io.meta_read.bits.addr := io.release.bits.addr << conf.offbits
io.meta_read.bits.idx := req.idx
io.meta_read.bits.tag := req.tag
io.data_req.valid := fire
io.data_req.bits.way_en := req.way_en
@@ -486,7 +492,7 @@ class ProbeUnit(implicit conf: DCacheConfig) extends Module {
val io = new Bundle {
val req = Decoupled(new InternalProbe).flip
val rep = Decoupled(new Release)
val meta_read = Decoupled(new MetaReadReq)
val meta_read = Decoupled(new L1MetaReadReq)
val meta_write = Decoupled(new MetaWriteReq)
val wb_req = Decoupled(new WritebackReq)
val way_en = Bits(INPUT, conf.ways)
@@ -541,7 +547,8 @@ class ProbeUnit(implicit conf: DCacheConfig) extends Module {
io.rep.bits := Release(tl.co.getReleaseTypeOnProbe(req, Mux(hit, line_state, tl.co.newStateOnFlush)), req.addr, req.client_xact_id, req.master_xact_id)
io.meta_read.valid := state === s_meta_read
io.meta_read.bits.addr := req.addr << conf.offbits
io.meta_read.bits.idx := req.addr
io.meta_read.bits.tag := req.addr >> conf.idxbits
io.meta_write.valid := state === s_meta_write
io.meta_write.bits.way_en := way_en
@@ -579,7 +586,7 @@ class MetaDataArray(implicit conf: DCacheConfig) extends Module {
val mask = Mux(rst, SInt(-1), io.write.bits.way_en)
tags.write(addr, Fill(conf.ways, data), FillInterleaved(metabits, mask))
}
val tag = tags(RegEnable(io.read.bits.addr >> conf.offbits, io.read.valid))
val tag = tags(RegEnable(io.read.bits.idx, io.read.valid))
for (w <- 0 until conf.ways) {
val m = tag(metabits*(w+1)-1, metabits*w)
@@ -775,11 +782,11 @@ class HellaCache(implicit conf: DCacheConfig) extends Module {
s1_req := io.cpu.req.bits
}
when (wb.io.meta_read.valid) {
s1_req := wb.io.meta_read.bits
s1_req.addr := Cat(wb.io.meta_read.bits.tag, wb.io.meta_read.bits.idx) << conf.offbits
s1_req.phys := Bool(true)
}
when (prober.io.meta_read.valid) {
s1_req := prober.io.meta_read.bits
s1_req.addr := Cat(prober.io.meta_read.bits.tag, prober.io.meta_read.bits.idx) << conf.offbits
s1_req.phys := Bool(true)
}
when (mshrs.io.replay.valid) {
@@ -833,7 +840,7 @@ class HellaCache(implicit conf: DCacheConfig) extends Module {
// tag read for new requests
metaReadArb.io.in(4).valid := io.cpu.req.valid
metaReadArb.io.in(4).bits.addr := io.cpu.req.bits.addr
metaReadArb.io.in(4).bits.idx := io.cpu.req.bits.addr >> conf.offbits
when (!metaReadArb.io.in(4).ready) { io.cpu.req.ready := Bool(false) }
// data read for new requests
@@ -844,7 +851,7 @@ class HellaCache(implicit conf: DCacheConfig) extends Module {
// recycled requests
metaReadArb.io.in(0).valid := s2_recycle
metaReadArb.io.in(0).bits.addr := s2_req.addr
metaReadArb.io.in(0).bits.idx := s2_req.addr >> conf.offbits
readArb.io.in(0).valid := s2_recycle
readArb.io.in(0).bits.addr := s2_req.addr
readArb.io.in(0).bits.way_en := SInt(-1)