riscv/rocket-chip
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fix some LLC control bugs

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This commit is contained in:
Andrew Waterman 2012-08-06 17:10:04 -07:00
parent e9c35b4923
commit 897a4e349b
1 changed files with 17 additions and 12 deletions
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29
rocket/src/main/scala/llc.scala
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@ -383,15 +383,20 @@ class DRAMSideLLC(sets: Int, ways: Int, outstanding: Int, tagLeaf: Mem[Bits], da
val repl_way = LFSR16(s2_valid)(log2Up(ways)-1, 0) val repl_way = LFSR16(s2_valid)(log2Up(ways)-1, 0)
val repl_tag = s2_tags(repl_way).toUFix val repl_tag = s2_tags(repl_way).toUFix
val setDirty = s2_valid && s2.rw && s2_hit && !s2_hit_dirty val setDirty = s2_valid && s2.rw && s2_hit && !s2_hit_dirty
stall_s1 := initialize || mshr.io.tag.valid || setDirty || s2_valid && !s2_hit || stall_s2 stall_s1 := initialize || stall_s2
tags.io.in.valid := (io.cpu.req_cmd.valid || replay_s1) && !stall_s1 || initialize || setDirty || mshr.io.tag.valid val tag_we = setDirty || mshr.io.tag.valid
tags.io.in.bits.addr := Mux(initialize, initCount, Mux(setDirty, s2.addr, Mux(mshr.io.tag.valid, mshr.io.tag.bits.addr, Mux(replay_s1, s1.addr, io.cpu.req_cmd.bits.addr)))(log2Up(sets)-1,0)) val tag_waddr = Mux(setDirty, s2.addr, mshr.io.tag.bits.addr)(log2Up(sets)-1,0)
tags.io.in.bits.rw := initialize || setDirty || mshr.io.tag.valid val tag_wdata = Cat(setDirty, Bool(true), Mux(setDirty, s2.addr, mshr.io.tag.bits.addr)(mshr.io.tag.bits.addr.width-1, mshr.io.tag.bits.addr.width-tagWidth))
tags.io.in.bits.wdata := Mux(initialize, UFix(0), Fill(ways, Cat(setDirty, Bool(true), Mux(setDirty, s2.addr, mshr.io.tag.bits.addr)(mshr.io.tag.bits.addr.width-1, mshr.io.tag.bits.addr.width-tagWidth)))) val tag_wway = Mux(setDirty, s2_hit_way, mshr.io.tag.bits.way)
tags.io.in.bits.wmask := FillInterleaved(metaWidth, Mux(initialize, Fix(-1, ways), UFixToOH(Mux(setDirty, s2_hit_way, mshr.io.tag.bits.way)))) tags.io.in.valid := (io.cpu.req_cmd.valid || replay_s1) && !stall_s1 || initialize || tag_we
tags.io.in.bits.addr := Mux(initialize, initCount, Mux(tag_we, tag_waddr, Mux(replay_s1, s1.addr, io.cpu.req_cmd.bits.addr)(log2Up(sets)-1,0)))
tags.io.in.bits.rw := initialize || tag_we
tags.io.in.bits.wdata := Mux(initialize, UFix(0), Fill(ways, tag_wdata))
tags.io.in.bits.wmask := FillInterleaved(metaWidth, Mux(initialize, Fix(-1, ways), UFixToOH(tag_wway)))
when (tag_we && Mux(stall_s2, s2.addr, s1.addr)(log2Up(sets)-1,0) === tag_waddr) { s2_tags(tag_wway) := tag_wdata }
mshr.io.cpu.valid := s2_valid && !s2_hit && !s2.rw mshr.io.cpu.valid := s2_valid && !s2_hit && !s2.rw && dataArb.io.in(1).ready && writeback.io.req(0).ready // stall_s2
mshr.io.cpu.bits := s2 mshr.io.cpu.bits := s2
mshr.io.repl_way := repl_way mshr.io.repl_way := repl_way
mshr.io.repl_dirty := repl_tag(tagWidth+1, tagWidth).andR mshr.io.repl_dirty := repl_tag(tagWidth+1, tagWidth).andR
@ -404,29 +409,29 @@ class DRAMSideLLC(sets: Int, ways: Int, outstanding: Int, tagLeaf: Mem[Bits], da
data.io.mem_resp_set := mshr.io.mem_resp_set data.io.mem_resp_set := mshr.io.mem_resp_set
data.io.mem_resp_way := mshr.io.mem_resp_way data.io.mem_resp_way := mshr.io.mem_resp_way
data.io.req_data.bits := io.cpu.req_data.bits data.io.req_data.bits := io.cpu.req_data.bits
data.io.req_data.valid := io.cpu.req_data.valid
writeback.io.req(0) <> data.io.writeback writeback.io.req(0) <> data.io.writeback
writeback.io.data(0) <> data.io.writeback_data writeback.io.data(0) <> data.io.writeback_data
writeback.io.req(1).valid := s2_valid && !s2_hit && s2.rw writeback.io.req(1).valid := s2_valid && !s2_hit && s2.rw && dataArb.io.in(1).ready && mshr.io.cpu.ready // stall_s2
writeback.io.req(1).bits := s2.addr writeback.io.req(1).bits := s2.addr
writeback.io.data(1).valid := io.cpu.req_data.valid writeback.io.data(1).valid := io.cpu.req_data.valid
writeback.io.data(1).bits := io.cpu.req_data.bits writeback.io.data(1).bits := io.cpu.req_data.bits
data.io.req_data.valid := io.cpu.req_data.valid && writeback.io.req(1).ready
memCmdArb.io.in(0) <> mshr.io.mem.req_cmd memCmdArb.io.in(0) <> mshr.io.mem.req_cmd
memCmdArb.io.in(1) <> writeback.io.mem.req_cmd memCmdArb.io.in(1) <> writeback.io.mem.req_cmd
dataArb.io.in(0) <> mshr.io.data dataArb.io.in(0) <> mshr.io.data
dataArb.io.in(1).valid := s2_valid && s2_hit dataArb.io.in(1).valid := s2_valid && s2_hit && writeback.io.req(0).ready && mshr.io.cpu.ready // stall_s2
dataArb.io.in(1).bits := s2 dataArb.io.in(1).bits := s2
dataArb.io.in(1).bits.way := s2_hit_way dataArb.io.in(1).bits.way := s2_hit_way
dataArb.io.in(1).bits.isWriteback := Bool(false) dataArb.io.in(1).bits.isWriteback := Bool(false)
stall_s2 := s2_valid && !Mux(s2_hit, dataArb.io.in(1).ready, Mux(s2.rw, writeback.io.req(1).ready, mshr.io.cpu.ready)) stall_s2 := s2_valid && !(dataArb.io.in(1).ready && writeback.io.req(0).ready && mshr.io.cpu.ready)
io.cpu.resp <> data.io.resp io.cpu.resp <> data.io.resp
io.cpu.req_cmd.ready := !stall_s1 && !replay_s1 io.cpu.req_cmd.ready := !stall_s1 && !replay_s1
io.cpu.req_data.ready := writeback.io.data(1).ready || data.io.req_data.ready && writeback.io.req(1).ready io.cpu.req_data.ready := writeback.io.data(1).ready || data.io.req_data.ready
io.mem.req_cmd <> memCmdArb.io.out io.mem.req_cmd <> memCmdArb.io.out
io.mem.req_data <> writeback.io.mem.req_data io.mem.req_data <> writeback.io.mem.req_data
} }