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| author | Suzuki K Poulose <suzuki.poulose@arm.com> | 2018-07-10 10:58:02 +0200 |
|---|---|---|
| committer | Will Deacon <will.deacon@arm.com> | 2018-07-10 19:19:02 +0200 |
| commit | 0c55d19c1659d3fc38dcecca8bdaf6eabda39a9d (patch) | |
| tree | e3f74ec75ccda43d4a44159f3bed3764560880dd /arch/arm64/kernel/perf_event.c | |
| parent | arm_pmu: Tidy up clear_event_idx call backs (diff) | |
| download | linux-0c55d19c1659d3fc38dcecca8bdaf6eabda39a9d.tar.xz linux-0c55d19c1659d3fc38dcecca8bdaf6eabda39a9d.zip | |
arm64: perf: Clean up armv8pmu_select_counter
armv8pmu_select_counter always returns the passed idx. So
let us make that void and get rid of the pointless checks.
Suggested-by: Mark Rutland <mark.rutland@arm.com>
Cc: Will Deacon <will.deacon@arm.com>
Acked-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Diffstat (limited to 'arch/arm64/kernel/perf_event.c')
| -rw-r--r-- | arch/arm64/kernel/perf_event.c | 29 |
1 files changed, 19 insertions, 10 deletions
diff --git a/arch/arm64/kernel/perf_event.c b/arch/arm64/kernel/perf_event.c index ac66851d4b13..bc014af59fb3 100644 --- a/arch/arm64/kernel/perf_event.c +++ b/arch/arm64/kernel/perf_event.c @@ -503,13 +503,17 @@ static inline int armv8pmu_counter_has_overflowed(u32 pmnc, int idx) return pmnc & BIT(ARMV8_IDX_TO_COUNTER(idx)); } -static inline int armv8pmu_select_counter(int idx) +static inline void armv8pmu_select_counter(int idx) { u32 counter = ARMV8_IDX_TO_COUNTER(idx); write_sysreg(counter, pmselr_el0); isb(); +} - return idx; +static inline u32 armv8pmu_read_evcntr(int idx) +{ + armv8pmu_select_counter(idx); + return read_sysreg(pmxevcntr_el0); } static inline u64 armv8pmu_read_counter(struct perf_event *event) @@ -524,12 +528,18 @@ static inline u64 armv8pmu_read_counter(struct perf_event *event) smp_processor_id(), idx); else if (idx == ARMV8_IDX_CYCLE_COUNTER) value = read_sysreg(pmccntr_el0); - else if (armv8pmu_select_counter(idx) == idx) - value = read_sysreg(pmxevcntr_el0); + else + value = armv8pmu_read_evcntr(idx); return value; } +static inline void armv8pmu_write_evcntr(int idx, u32 value) +{ + armv8pmu_select_counter(idx); + write_sysreg(value, pmxevcntr_el0); +} + static inline void armv8pmu_write_counter(struct perf_event *event, u64 value) { struct arm_pmu *cpu_pmu = to_arm_pmu(event->pmu); @@ -547,16 +557,15 @@ static inline void armv8pmu_write_counter(struct perf_event *event, u64 value) */ value |= 0xffffffff00000000ULL; write_sysreg(value, pmccntr_el0); - } else if (armv8pmu_select_counter(idx) == idx) - write_sysreg(value, pmxevcntr_el0); + } else + armv8pmu_write_evcntr(idx, value); } static inline void armv8pmu_write_evtype(int idx, u32 val) { - if (armv8pmu_select_counter(idx) == idx) { - val &= ARMV8_PMU_EVTYPE_MASK; - write_sysreg(val, pmxevtyper_el0); - } + armv8pmu_select_counter(idx); + val &= ARMV8_PMU_EVTYPE_MASK; + write_sysreg(val, pmxevtyper_el0); } static inline int armv8pmu_enable_counter(int idx) |