diff options
| author | Atish Patra <atishp@rivosinc.com> | 2023-02-05 04:15:02 +0300 |
|---|---|---|
| committer | Anup Patel <anup@brainfault.org> | 2023-02-07 18:05:31 +0300 |
| commit | 585e351ff359c032ea7ab48d999b252ba09f8051 (patch) | |
| tree | 044d4851b92f96f89b686c3b2c597d4c3304dc80 /include/linux/perf | |
| parent | cdeb59bbf19f456253fd257c744b8383f972cf1e (diff) | |
| download | linux-585e351ff359c032ea7ab48d999b252ba09f8051.tar.xz | |
perf: RISC-V: Define helper functions expose hpm counter width and count
KVM module needs to know how many hardware counters and the counter
width that the platform supports. Otherwise, it will not be able to show
optimal value of virtual counters to the guest. The virtual hardware
counters also need to have the same width as the logical hardware
counters for simplicity. However, there shouldn't be mapping between
virtual hardware counters and logical hardware counters. As we don't
support hetergeneous harts or counters with different width as of now,
the implementation relies on the counter width of the first available
programmable counter.
Reviewed-by: Anup Patel <anup@brainfault.org>
Reviewed-by: Andrew Jones <ajones@ventanamicro.com>
Signed-off-by: Atish Patra <atishp@rivosinc.com>
Signed-off-by: Anup Patel <anup@brainfault.org>
Diffstat (limited to 'include/linux/perf')
| -rw-r--r-- | include/linux/perf/riscv_pmu.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/include/linux/perf/riscv_pmu.h b/include/linux/perf/riscv_pmu.h index e17e86ad6f3a..a1c3f7771481 100644 --- a/include/linux/perf/riscv_pmu.h +++ b/include/linux/perf/riscv_pmu.h @@ -73,6 +73,9 @@ void riscv_pmu_legacy_skip_init(void); static inline void riscv_pmu_legacy_skip_init(void) {}; #endif struct riscv_pmu *riscv_pmu_alloc(void); +#ifdef CONFIG_RISCV_PMU_SBI +int riscv_pmu_get_hpm_info(u32 *hw_ctr_width, u32 *num_hw_ctr); +#endif #endif /* CONFIG_RISCV_PMU */ |