riscv/rocket-chip
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Add performance counter facility

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This commit is contained in:
Andrew Waterman
2017-03-09 00:28:19 -08:00
parent e57ee2692d
commit 4f8f05d635
10 changed files with 132 additions and 15 deletions
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33
src/main/scala/rocket/CSR.scala
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@@ -124,14 +124,23 @@ object CSR
}
val firstCtr = CSRs.cycle
val firstCtrH = CSRs.cycleh
val firstHPC = CSRs.hpmcounter3
val firstHPCH = CSRs.hpmcounter3h
val firstHPE = CSRs.mhpmevent3
val firstMHPC = CSRs.mhpmcounter3
val firstMHPCH = CSRs.mhpmcounter3h
val firstHPM = 3
val nCtr = 32
val nHPM = nCtr - firstHPM
}
class PerfCounterIO(implicit p: Parameters) extends CoreBundle
with HasRocketCoreParameters {
val eventSel = UInt(OUTPUT, xLen)
val inc = UInt(INPUT, log2Ceil(1+retireWidth))
}
class CSRFileIO(implicit p: Parameters) extends CoreBundle
with HasRocketCoreParameters {
val interrupts = new TileInterrupts().asInput
@@ -174,10 +183,10 @@ class CSRFileIO(implicit p: Parameters) extends CoreBundle
val interrupt = Bool(OUTPUT)
val interrupt_cause = UInt(OUTPUT, xLen)
val bp = Vec(nBreakpoints, new BP).asOutput
val events = Vec(nPerfEvents, Bool()).asInput
val counters = Vec(nPerfCounters, new PerfCounterIO)
}
class CSRFile(implicit p: Parameters) extends CoreModule()(p)
class CSRFile(perfEventSets: EventSets = new EventSets(Seq()))(implicit p: Parameters) extends CoreModule()(p)
with HasRocketCoreParameters {
val io = new CSRFileIO
@@ -258,8 +267,9 @@ class CSRFile(implicit p: Parameters) extends CoreModule()(p)
val reg_instret = WideCounter(64, io.retire)
val reg_cycle = if (enableCommitLog) reg_instret else WideCounter(64)
val reg_hpmevent = Seq.fill(nPerfCounters)(if (nPerfEvents > 1) Reg(UInt(width = log2Ceil(nPerfEvents))) else UInt(0))
val reg_hpmcounter = reg_hpmevent.map(e => WideCounter(64, ((UInt(0) +: io.events): Seq[UInt])(e)))
val reg_hpmevent = io.counters.map(c => Reg(init = UInt(0, xLen)))
(io.counters zip reg_hpmevent) foreach { case (c, e) => c.eventSel := e }
val reg_hpmcounter = io.counters.map(c => WideCounter(40, c.inc, reset = false))
val hpm_mask = reg_mcounteren & Mux((!usingVM).B || reg_mstatus.prv === PRV.S, delegable_counters.U, reg_scounteren)
val mip = Wire(init=reg_mip)
@@ -339,6 +349,10 @@ class CSRFile(implicit p: Parameters) extends CoreModule()(p)
read_mapping += (i + CSR.firstHPE) -> e // mhpmeventN
read_mapping += (i + CSR.firstMHPC) -> c // mhpmcounterN
if (usingUser) read_mapping += (i + CSR.firstHPC) -> c // hpmcounterN
if (xLen == 32) {
read_mapping += (i + CSR.firstMHPCH) -> c // mhpmcounterNh
if (usingUser) read_mapping += (i + CSR.firstHPCH) -> c // hpmcounterNh
}
}
if (usingVM) {
@@ -407,7 +421,7 @@ class CSRFile(implicit p: Parameters) extends CoreModule()(p)
io.decode.read_illegal := effective_prv < io.decode.csr(9,8) ||
!read_mapping.keys.map(io.decode.csr === _).reduce(_||_) ||
io.decode.csr === CSRs.sptbr && !allow_sfence_vma ||
io.decode.csr >= CSR.firstCtr && io.decode.csr < CSR.firstCtr + CSR.nCtr && effective_prv <= PRV.S && hpm_mask(io.decode.csr(log2Ceil(CSR.firstCtr)-1,0)) ||
(io.decode.csr.inRange(CSR.firstCtr, CSR.firstCtr + CSR.nCtr) || io.decode.csr.inRange(CSR.firstCtrH, CSR.firstCtrH + CSR.nCtr)) && effective_prv <= PRV.S && hpm_mask(io.decode.csr(log2Ceil(CSR.firstCtr)-1,0)) ||
Bool(usingDebug) && !reg_debug && debug_csrs.keys.map(io.decode.csr === _).reduce(_||_) ||
Bool(usingFPU) && fp_csrs.keys.map(io.decode.csr === _).reduce(_||_) && io.decode.fp_illegal
io.decode.write_illegal := io.decode.csr(11,10).andR
@@ -561,8 +575,7 @@ class CSRFile(implicit p: Parameters) extends CoreModule()(p)
for (((e, c), i) <- (reg_hpmevent zip reg_hpmcounter) zipWithIndex) {
writeCounter(i + CSR.firstMHPC, c, wdata)
if (nPerfEvents > 1)
when (decoded_addr(i + CSR.firstHPE)) { e := wdata }
when (decoded_addr(i + CSR.firstHPE)) { e := perfEventSets.maskEventSelector(wdata) }
}
writeCounter(CSRs.mcycle, reg_cycle, wdata)
writeCounter(CSRs.minstret, reg_instret, wdata)
@@ -688,10 +701,10 @@ class CSRFile(implicit p: Parameters) extends CoreModule()(p)
def writeCounter(lo: Int, ctr: WideCounter, wdata: UInt) = {
if (xLen == 32) {
val hi = lo + CSRs.mcycleh - CSRs.mcycle
when (decoded_addr(lo)) { ctr := Cat(ctr(63, 32), wdata) }
when (decoded_addr(hi)) { ctr := Cat(wdata, ctr(31, 0)) }
when (decoded_addr(lo)) { ctr := Cat(ctr(ctr.getWidth-1, 32), wdata) }
when (decoded_addr(hi)) { ctr := Cat(wdata(ctr.getWidth-33, 0), ctr(31, 0)) }
} else {
when (decoded_addr(lo)) { ctr := wdata }
when (decoded_addr(lo)) { ctr := wdata(ctr.getWidth-1, 0) }
}
}
def formEPC(x: UInt) = ~(~x | Cat(!reg_misa('c'-'a'), UInt(1)))