diff options
| author | Atish Patra <atishp@rivosinc.com> | 2025-09-09 00:03:23 -0700 |
|---|---|---|
| committer | Anup Patel <anup@brainfault.org> | 2025-09-16 11:49:31 +0530 |
| commit | adffbd06d0036a1f2d8424ecc22d37ca38709012 (patch) | |
| tree | fb6e1f4106c880a92801977eb49ce5f5ee519e00 /arch | |
| parent | RISC-V: KVM: Add support for Raw event v2 (diff) | |
| download | linux-adffbd06d0036a1f2d8424ecc22d37ca38709012.tar.gz linux-adffbd06d0036a1f2d8424ecc22d37ca38709012.zip | |
drivers/perf: riscv: Implement PMU event info function
With the new SBI PMU event info function, we can query the availability
of the all standard SBI PMU events at boot time with a single ecall.
This improves the bootime by avoiding making an SBI call for each
standard PMU event. Since this function is defined only in SBI v3.0,
invoke this only if the underlying SBI implementation is v3.0 or higher.
Signed-off-by: Atish Patra <atishp@rivosinc.com>
Reviewed-by: Anup Patel <anup@brainfault.org>
Acked-by: Paul Walmsley <pjw@kernel.org>
Link: https://lore.kernel.org/r/20250909-pmu_event_info-v6-4-d8f80cacb884@rivosinc.com
Signed-off-by: Anup Patel <anup@brainfault.org>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/riscv/include/asm/sbi.h | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/arch/riscv/include/asm/sbi.h b/arch/riscv/include/asm/sbi.h index b0c41ef56968..5ca7cebc13cc 100644 --- a/arch/riscv/include/asm/sbi.h +++ b/arch/riscv/include/asm/sbi.h @@ -136,6 +136,7 @@ enum sbi_ext_pmu_fid { SBI_EXT_PMU_COUNTER_FW_READ, SBI_EXT_PMU_COUNTER_FW_READ_HI, SBI_EXT_PMU_SNAPSHOT_SET_SHMEM, + SBI_EXT_PMU_EVENT_GET_INFO, }; union sbi_pmu_ctr_info { @@ -159,6 +160,14 @@ struct riscv_pmu_snapshot_data { u64 reserved[447]; }; +struct riscv_pmu_event_info { + u32 event_idx; + u32 output; + u64 event_data; +}; + +#define RISCV_PMU_EVENT_INFO_OUTPUT_MASK 0x01 + #define RISCV_PMU_RAW_EVENT_MASK GENMASK_ULL(47, 0) #define RISCV_PMU_PLAT_FW_EVENT_MASK GENMASK_ULL(61, 0) /* SBI v3.0 allows extended hpmeventX width value */ |