Fix MMIO bug: replay_next wasn't set
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742c05d6a7
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4aef567a80
@ -55,9 +55,7 @@ class HellaCacheArbiter(n: Int)(implicit p: Parameters) extends Module
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resp.bits := io.mem.resp.bits
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resp.bits.tag := io.mem.resp.bits.tag >> log2Up(n)
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io.requestor(i).replay_next.valid := io.mem.replay_next.valid &&
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io.mem.replay_next.bits(log2Up(n)-1,0) === UInt(i)
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io.requestor(i).replay_next.bits := io.mem.replay_next.bits >> log2Up(n)
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io.requestor(i).replay_next := io.mem.replay_next
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}
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}
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@ -100,7 +100,7 @@ class HellaCacheIO(implicit p: Parameters) extends CoreBundle()(p) {
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val s2_nack = Bool(INPUT) // req from two cycles ago is rejected
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val resp = Valid(new HellaCacheResp).flip
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val replay_next = Valid(Bits(width = coreDCacheReqTagBits)).flip
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val replay_next = Bool(INPUT)
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val xcpt = (new HellaCacheExceptions).asInput
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val invalidate_lr = Bool(OUTPUT)
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val ordered = Bool(INPUT)
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@ -157,6 +157,7 @@ class IOMSHR(id: Int)(implicit p: Parameters) extends L1HellaCacheModule()(p) {
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val grant = Valid(new GrantFromSrc).flip
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val finish = Decoupled(new FinishToDst)
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val resp = Decoupled(new HellaCacheResp)
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val replay_next = Bool(OUTPUT)
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}
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def wordFromBeat(addr: UInt, dat: UInt) = {
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@ -210,6 +211,7 @@ class IOMSHR(id: Int)(implicit p: Parameters) extends L1HellaCacheModule()(p) {
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io.acquire.valid := (state === s_acquire)
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io.acquire.bits := Mux(isRead(req.cmd), get_acquire, put_acquire)
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io.replay_next := (state === s_grant) || io.resp.valid && !io.resp.ready
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io.resp.valid := (state === s_resp)
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io.resp.bits := req
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io.resp.bits.has_data := isRead(req.cmd)
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@ -418,6 +420,7 @@ class MSHRFile(implicit p: Parameters) extends L1HellaCacheModule()(p) {
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val probe_rdy = Bool(OUTPUT)
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val fence_rdy = Bool(OUTPUT)
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val replay_next = Bool(OUTPUT)
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}
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// determine if the request is cacheable or not
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@ -501,6 +504,7 @@ class MSHRFile(implicit p: Parameters) extends L1HellaCacheModule()(p) {
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val resp_arb = Module(new Arbiter(new HellaCacheResp, nIOMSHRs))
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var mmio_rdy = Bool(false)
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io.replay_next := Bool(false)
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for (i <- 0 until nIOMSHRs) {
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val id = nMSHRs + i
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@ -522,6 +526,7 @@ class MSHRFile(implicit p: Parameters) extends L1HellaCacheModule()(p) {
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resp_arb.io.in(i) <> mshr.io.resp
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when (!mshr.io.req.ready) { io.fence_rdy := Bool(false) }
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when (mshr.io.replay_next) { io.replay_next := Bool(true) }
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}
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mmio_alloc_arb.io.out.ready := io.req.valid && !cacheable
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@ -1086,8 +1091,7 @@ class HellaCache(implicit p: Parameters) extends L1HellaCacheModule()(p) {
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io.cpu.resp := Mux(mshrs.io.resp.ready, uncache_resp, cache_resp)
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io.cpu.resp.bits.data_word_bypass := loadgen.wordData
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io.cpu.ordered := mshrs.io.fence_rdy && !s1_valid && !s2_valid
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io.cpu.replay_next.valid := s1_replay && s1_read
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io.cpu.replay_next.bits := s1_req.tag
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io.cpu.replay_next := (s1_replay && s1_read) || mshrs.io.replay_next
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}
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// exposes a sane decoupled request interface
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@ -352,7 +352,7 @@ class Rocket(implicit p: Parameters) extends CoreModule()(p) {
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(mem_reg_valid && mem_ctrl.mem && io.dmem.xcpt.pf.st, UInt(Causes.fault_store)),
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(mem_reg_valid && mem_ctrl.mem && io.dmem.xcpt.pf.ld, UInt(Causes.fault_load))))
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val dcache_kill_mem = mem_reg_valid && mem_ctrl.wxd && io.dmem.replay_next.valid // structural hazard on writeback port
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val dcache_kill_mem = mem_reg_valid && mem_ctrl.wxd && io.dmem.replay_next // structural hazard on writeback port
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val fpu_kill_mem = mem_reg_valid && mem_ctrl.fp && io.fpu.nack_mem
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val replay_mem = dcache_kill_mem || mem_reg_replay || fpu_kill_mem
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val killm_common = dcache_kill_mem || take_pc_wb || mem_reg_xcpt || !mem_reg_valid
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