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Re: [PATCH v10 04/12] target/riscv: pmu: Make number of counters configu
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From: |
Atish Kumar Patra |
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Subject: |
Re: [PATCH v10 04/12] target/riscv: pmu: Make number of counters configurable |
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Date: |
Tue, 5 Jul 2022 00:51:12 -0700 |
On Mon, Jul 4, 2022 at 5:38 PM Weiwei Li <liweiwei@iscas.ac.cn> wrote:
>
>
> 在 2022/7/4 下午11:26, Weiwei Li 写道:
> >
> > 在 2022/6/21 上午7:15, Atish Patra 写道:
> >> The RISC-V privilege specification provides flexibility to implement
> >> any number of counters from 29 programmable counters. However, the QEMU
> >> implements all the counters.
> >>
> >> Make it configurable through pmu config parameter which now will
> >> indicate
> >> how many programmable counters should be implemented by the cpu.
> >>
> >> Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
> >> Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
> >> Signed-off-by: Atish Patra <atish.patra@wdc.com>
> >> Signed-off-by: Atish Patra <atishp@rivosinc.com>
> >> ---
> >> target/riscv/cpu.c | 3 +-
> >> target/riscv/cpu.h | 2 +-
> >> target/riscv/csr.c | 94 ++++++++++++++++++++++++++++++----------------
> >> 3 files changed, 63 insertions(+), 36 deletions(-)
> >>
> >> diff --git a/target/riscv/cpu.c b/target/riscv/cpu.c
> >> index 1b57b3c43980..d12c6dc630ca 100644
> >> --- a/target/riscv/cpu.c
> >> +++ b/target/riscv/cpu.c
> >> @@ -851,7 +851,6 @@ static void riscv_cpu_init(Object *obj)
> >> {
> >> RISCVCPU *cpu = RISCV_CPU(obj);
> >> - cpu->cfg.ext_pmu = true;
> >> cpu->cfg.ext_ifencei = true;
> >> cpu->cfg.ext_icsr = true;
> >> cpu->cfg.mmu = true;
> >> @@ -879,7 +878,7 @@ static Property riscv_cpu_extensions[] = {
> >> DEFINE_PROP_BOOL("u", RISCVCPU, cfg.ext_u, true),
> >> DEFINE_PROP_BOOL("v", RISCVCPU, cfg.ext_v, false),
> >> DEFINE_PROP_BOOL("h", RISCVCPU, cfg.ext_h, true),
> >> - DEFINE_PROP_BOOL("pmu", RISCVCPU, cfg.ext_pmu, true),
> >> + DEFINE_PROP_UINT8("pmu-num", RISCVCPU, cfg.pmu_num, 16),
> >
> > I think It's better to add a check on cfg.pmu_num to <= 29.
> >
> OK, I find this check in the following patch.
> >> DEFINE_PROP_BOOL("Zifencei", RISCVCPU, cfg.ext_ifencei, true),
> >> DEFINE_PROP_BOOL("Zicsr", RISCVCPU, cfg.ext_icsr, true),
> >> DEFINE_PROP_BOOL("Zfh", RISCVCPU, cfg.ext_zfh, false),
> >> diff --git a/target/riscv/cpu.h b/target/riscv/cpu.h
> >> index 252c30a55d78..ffee54ea5c27 100644
> >> --- a/target/riscv/cpu.h
> >> +++ b/target/riscv/cpu.h
> >> @@ -397,7 +397,6 @@ struct RISCVCPUConfig {
> >> bool ext_zksed;
> >> bool ext_zksh;
> >> bool ext_zkt;
> >> - bool ext_pmu;
> >> bool ext_ifencei;
> >> bool ext_icsr;
> >> bool ext_svinval;
> >> @@ -421,6 +420,7 @@ struct RISCVCPUConfig {
> >> /* Vendor-specific custom extensions */
> >> bool ext_XVentanaCondOps;
> >> + uint8_t pmu_num;
> >> char *priv_spec;
> >> char *user_spec;
> >> char *bext_spec;
> >> diff --git a/target/riscv/csr.c b/target/riscv/csr.c
> >> index 0ca05c77883c..b4a8e15f498f 100644
> >> --- a/target/riscv/csr.c
> >> +++ b/target/riscv/csr.c
> >> @@ -73,9 +73,17 @@ static RISCVException ctr(CPURISCVState *env, int
> >> csrno)
> >> CPUState *cs = env_cpu(env);
> >> RISCVCPU *cpu = RISCV_CPU(cs);
> >> int ctr_index;
> >> + int base_csrno = CSR_HPMCOUNTER3;
> >> + bool rv32 = riscv_cpu_mxl(env) == MXL_RV32 ? true : false;
> >> - if (!cpu->cfg.ext_pmu) {
> >> - /* The PMU extension is not enabled */
> >> + if (rv32 && csrno >= CSR_CYCLEH) {
> >> + /* Offset for RV32 hpmcounternh counters */
> >> + base_csrno += 0x80;
> >> + }
> >> + ctr_index = csrno - base_csrno;
> >> +
> >> + if (!cpu->cfg.pmu_num || ctr_index >= (cpu->cfg.pmu_num)) {
> >> + /* No counter is enabled in PMU or the counter is out of
> >> range */
> >
> > I seems unnecessary to add '!cpu->cfg.pmu_num ' here, 'ctr_index >=
> > (cpu->cfg.pmu_num)' is true
The check is improved in the following patches as well.
> Typo. I -> It
> >
> > when cpu->cfg.pmu_num is zero if the problem for base_csrno is fixed.
> >
> > Ragards,
> >
> > Weiwei Li
> >
> >> return RISCV_EXCP_ILLEGAL_INST;
> >> }
> >> @@ -103,7 +111,7 @@ static RISCVException ctr(CPURISCVState *env,
> >> int csrno)
> >> }
> >> break;
> >> }
> >> - if (riscv_cpu_mxl(env) == MXL_RV32) {
> >> + if (rv32) {
> >> switch (csrno) {
> >> case CSR_CYCLEH:
> >> if (!get_field(env->mcounteren, COUNTEREN_CY)) {
> >> @@ -158,7 +166,7 @@ static RISCVException ctr(CPURISCVState *env, int
> >> csrno)
> >> }
> >> break;
> >> }
> >> - if (riscv_cpu_mxl(env) == MXL_RV32) {
> >> + if (rv32) {
> >> switch (csrno) {
> >> case CSR_CYCLEH:
> >> if (!get_field(env->hcounteren, COUNTEREN_CY) &&
> >> @@ -202,6 +210,26 @@ static RISCVException ctr32(CPURISCVState *env,
> >> int csrno)
> >> }
> >> #if !defined(CONFIG_USER_ONLY)
> >> +static RISCVException mctr(CPURISCVState *env, int csrno)
> >> +{
> >> + CPUState *cs = env_cpu(env);
> >> + RISCVCPU *cpu = RISCV_CPU(cs);
> >> + int ctr_index;
> >> + int base_csrno = CSR_MHPMCOUNTER3;
> >> +
> >> + if ((riscv_cpu_mxl(env) == MXL_RV32) && csrno >= CSR_MCYCLEH) {
> >> + /* Offset for RV32 mhpmcounternh counters */
> >> + base_csrno += 0x80;
> >> + }
> >> + ctr_index = csrno - base_csrno;
> >> + if (!cpu->cfg.pmu_num || ctr_index >= cpu->cfg.pmu_num) {
> >> + /* The PMU is not enabled or counter is out of range*/
> >> + return RISCV_EXCP_ILLEGAL_INST;
> >> + }
> >> +
> >> + return RISCV_EXCP_NONE;
> >> +}
> >> +
> >> static RISCVException any(CPURISCVState *env, int csrno)
> >> {
> >> return RISCV_EXCP_NONE;
> >> @@ -3687,35 +3715,35 @@ riscv_csr_operations csr_ops[CSR_TABLE_SIZE] = {
> >> [CSR_HPMCOUNTER30] = { "hpmcounter30", ctr, read_zero },
> >> [CSR_HPMCOUNTER31] = { "hpmcounter31", ctr, read_zero },
> >> - [CSR_MHPMCOUNTER3] = { "mhpmcounter3", any, read_zero },
> >> - [CSR_MHPMCOUNTER4] = { "mhpmcounter4", any, read_zero },
> >> - [CSR_MHPMCOUNTER5] = { "mhpmcounter5", any, read_zero },
> >> - [CSR_MHPMCOUNTER6] = { "mhpmcounter6", any, read_zero },
> >> - [CSR_MHPMCOUNTER7] = { "mhpmcounter7", any, read_zero },
> >> - [CSR_MHPMCOUNTER8] = { "mhpmcounter8", any, read_zero },
> >> - [CSR_MHPMCOUNTER9] = { "mhpmcounter9", any, read_zero },
> >> - [CSR_MHPMCOUNTER10] = { "mhpmcounter10", any, read_zero },
> >> - [CSR_MHPMCOUNTER11] = { "mhpmcounter11", any, read_zero },
> >> - [CSR_MHPMCOUNTER12] = { "mhpmcounter12", any, read_zero },
> >> - [CSR_MHPMCOUNTER13] = { "mhpmcounter13", any, read_zero },
> >> - [CSR_MHPMCOUNTER14] = { "mhpmcounter14", any, read_zero },
> >> - [CSR_MHPMCOUNTER15] = { "mhpmcounter15", any, read_zero },
> >> - [CSR_MHPMCOUNTER16] = { "mhpmcounter16", any, read_zero },
> >> - [CSR_MHPMCOUNTER17] = { "mhpmcounter17", any, read_zero },
> >> - [CSR_MHPMCOUNTER18] = { "mhpmcounter18", any, read_zero },
> >> - [CSR_MHPMCOUNTER19] = { "mhpmcounter19", any, read_zero },
> >> - [CSR_MHPMCOUNTER20] = { "mhpmcounter20", any, read_zero },
> >> - [CSR_MHPMCOUNTER21] = { "mhpmcounter21", any, read_zero },
> >> - [CSR_MHPMCOUNTER22] = { "mhpmcounter22", any, read_zero },
> >> - [CSR_MHPMCOUNTER23] = { "mhpmcounter23", any, read_zero },
> >> - [CSR_MHPMCOUNTER24] = { "mhpmcounter24", any, read_zero },
> >> - [CSR_MHPMCOUNTER25] = { "mhpmcounter25", any, read_zero },
> >> - [CSR_MHPMCOUNTER26] = { "mhpmcounter26", any, read_zero },
> >> - [CSR_MHPMCOUNTER27] = { "mhpmcounter27", any, read_zero },
> >> - [CSR_MHPMCOUNTER28] = { "mhpmcounter28", any, read_zero },
> >> - [CSR_MHPMCOUNTER29] = { "mhpmcounter29", any, read_zero },
> >> - [CSR_MHPMCOUNTER30] = { "mhpmcounter30", any, read_zero },
> >> - [CSR_MHPMCOUNTER31] = { "mhpmcounter31", any, read_zero },
> >> + [CSR_MHPMCOUNTER3] = { "mhpmcounter3", mctr, read_zero },
> >> + [CSR_MHPMCOUNTER4] = { "mhpmcounter4", mctr, read_zero },
> >> + [CSR_MHPMCOUNTER5] = { "mhpmcounter5", mctr, read_zero },
> >> + [CSR_MHPMCOUNTER6] = { "mhpmcounter6", mctr, read_zero },
> >> + [CSR_MHPMCOUNTER7] = { "mhpmcounter7", mctr, read_zero },
> >> + [CSR_MHPMCOUNTER8] = { "mhpmcounter8", mctr, read_zero },
> >> + [CSR_MHPMCOUNTER9] = { "mhpmcounter9", mctr, read_zero },
> >> + [CSR_MHPMCOUNTER10] = { "mhpmcounter10", mctr, read_zero },
> >> + [CSR_MHPMCOUNTER11] = { "mhpmcounter11", mctr, read_zero },
> >> + [CSR_MHPMCOUNTER12] = { "mhpmcounter12", mctr, read_zero },
> >> + [CSR_MHPMCOUNTER13] = { "mhpmcounter13", mctr, read_zero },
> >> + [CSR_MHPMCOUNTER14] = { "mhpmcounter14", mctr, read_zero },
> >> + [CSR_MHPMCOUNTER15] = { "mhpmcounter15", mctr, read_zero },
> >> + [CSR_MHPMCOUNTER16] = { "mhpmcounter16", mctr, read_zero },
> >> + [CSR_MHPMCOUNTER17] = { "mhpmcounter17", mctr, read_zero },
> >> + [CSR_MHPMCOUNTER18] = { "mhpmcounter18", mctr, read_zero },
> >> + [CSR_MHPMCOUNTER19] = { "mhpmcounter19", mctr, read_zero },
> >> + [CSR_MHPMCOUNTER20] = { "mhpmcounter20", mctr, read_zero },
> >> + [CSR_MHPMCOUNTER21] = { "mhpmcounter21", mctr, read_zero },
> >> + [CSR_MHPMCOUNTER22] = { "mhpmcounter22", mctr, read_zero },
> >> + [CSR_MHPMCOUNTER23] = { "mhpmcounter23", mctr, read_zero },
> >> + [CSR_MHPMCOUNTER24] = { "mhpmcounter24", mctr, read_zero },
> >> + [CSR_MHPMCOUNTER25] = { "mhpmcounter25", mctr, read_zero },
> >> + [CSR_MHPMCOUNTER26] = { "mhpmcounter26", mctr, read_zero },
> >> + [CSR_MHPMCOUNTER27] = { "mhpmcounter27", mctr, read_zero },
> >> + [CSR_MHPMCOUNTER28] = { "mhpmcounter28", mctr, read_zero },
> >> + [CSR_MHPMCOUNTER29] = { "mhpmcounter29", mctr, read_zero },
> >> + [CSR_MHPMCOUNTER30] = { "mhpmcounter30", mctr, read_zero },
> >> + [CSR_MHPMCOUNTER31] = { "mhpmcounter31", mctr, read_zero },
> >> [CSR_MHPMEVENT3] = { "mhpmevent3", any, read_zero },
> >> [CSR_MHPMEVENT4] = { "mhpmevent4", any, read_zero },
> >
>