Re: [PATCH v5 19/22] KVM: riscv: selftests: Add SBI PMU extension definitions

Andrew Jones
2024-04-05T12:20:11Z

On Wed, Apr 03, 2024 at 01:04:48AM -0700, Atish Patra wrote:
> The SBI PMU extension definition is required for upcoming SBI PMU
> selftests.
>
> Reviewed-by: Anup Patel <anup@brainfault.org>
> Signed-off-by: Atish Patra <atishp@rivosinc.com>
> ---
> .../testing/selftests/kvm/include/riscv/sbi.h | 66 +++++++++++++++++++
> 1 file changed, 66 insertions(+)
>
> diff --git a/tools/testing/selftests/kvm/include/riscv/sbi.h b/tools/testing/selftests/kvm/include/riscv/sbi.h
> index ba04f2dec7b5..6675ca673c77 100644
> --- a/tools/testing/selftests/kvm/include/riscv/sbi.h
> +++ b/tools/testing/selftests/kvm/include/riscv/sbi.h
> @@ -29,17 +29,83 @@
> enum sbi_ext_id {
> SBI_EXT_BASE = 0x10,
> SBI_EXT_STA = 0x535441,
> + SBI_EXT_PMU = 0x504D55,
> };
>
> enum sbi_ext_base_fid {
> SBI_EXT_BASE_PROBE_EXT = 3,
> };
> +enum sbi_ext_pmu_fid {
> + SBI_EXT_PMU_NUM_COUNTERS = 0,
> + SBI_EXT_PMU_COUNTER_GET_INFO,
> + SBI_EXT_PMU_COUNTER_CFG_MATCH,
> + SBI_EXT_PMU_COUNTER_START,
> + SBI_EXT_PMU_COUNTER_STOP,
> + SBI_EXT_PMU_COUNTER_FW_READ,
> + SBI_EXT_PMU_COUNTER_FW_READ_HI,
> + SBI_EXT_PMU_SNAPSHOT_SET_SHMEM,
> +};
> +
> +union sbi_pmu_ctr_info {
> + unsigned long value;
> + struct {
> + unsigned long csr:12;
> + unsigned long width:6;
> +#if __riscv_xlen == 32
> + unsigned long reserved:13;
> +#else
> + unsigned long reserved:45;
> +#endif
> + unsigned long type:1;
> + };
> +};
>
> struct sbiret {
> long error;
> long value;
> };
>
> +/** General pmu event codes specified in SBI PMU extension */
> +enum sbi_pmu_hw_generic_events_t {
> + SBI_PMU_HW_NO_EVENT = 0,
> + SBI_PMU_HW_CPU_CYCLES = 1,
> + SBI_PMU_HW_INSTRUCTIONS = 2,
> + SBI_PMU_HW_CACHE_REFERENCES = 3,
> + SBI_PMU_HW_CACHE_MISSES = 4,
> + SBI_PMU_HW_BRANCH_INSTRUCTIONS = 5,
> + SBI_PMU_HW_BRANCH_MISSES = 6,
> + SBI_PMU_HW_BUS_CYCLES = 7,
> + SBI_PMU_HW_STALLED_CYCLES_FRONTEND = 8,
> + SBI_PMU_HW_STALLED_CYCLES_BACKEND = 9,
> + SBI_PMU_HW_REF_CPU_CYCLES = 10,
> +
> + SBI_PMU_HW_GENERAL_MAX,
> +};
> +
> +/* SBI PMU counter types */
> +enum sbi_pmu_ctr_type {
> + SBI_PMU_CTR_TYPE_HW = 0x0,
> + SBI_PMU_CTR_TYPE_FW,
> +};
> +
> +/* Flags defined for config matching function */
> +#define SBI_PMU_CFG_FLAG_SKIP_MATCH BIT(0)
> +#define SBI_PMU_CFG_FLAG_CLEAR_VALUE BIT(1)
> +#define SBI_PMU_CFG_FLAG_AUTO_START BIT(2)
> +#define SBI_PMU_CFG_FLAG_SET_VUINH BIT(3)
> +#define SBI_PMU_CFG_FLAG_SET_VSINH BIT(4)
> +#define SBI_PMU_CFG_FLAG_SET_UINH BIT(5)
> +#define SBI_PMU_CFG_FLAG_SET_SINH BIT(6)
> +#define SBI_PMU_CFG_FLAG_SET_MINH BIT(7)
> +
> +/* Flags defined for counter start function */
> +#define SBI_PMU_START_FLAG_SET_INIT_VALUE BIT(0)
> +#define SBI_PMU_START_FLAG_INIT_SNAPSHOT BIT(1)
> +
> +/* Flags defined for counter stop function */
> +#define SBI_PMU_STOP_FLAG_RESET BIT(0)
> +#define SBI_PMU_STOP_FLAG_TAKE_SNAPSHOT BIT(1)
> +
> struct sbiret sbi_ecall(int ext, int fid, unsigned long arg0,
> unsigned long arg1, unsigned long arg2,
> unsigned long arg3, unsigned long arg4,
> --
> 2.34.1
>

Reviewed-by: Andrew Jones <ajones@ventanamicro.com>