diff options
Diffstat (limited to 'drivers/perf/arm_pmu.c')
| -rw-r--r-- | drivers/perf/arm_pmu.c | 16 |
1 files changed, 12 insertions, 4 deletions
diff --git a/drivers/perf/arm_pmu.c b/drivers/perf/arm_pmu.c index a6347d487635..6ddc00da5373 100644 --- a/drivers/perf/arm_pmu.c +++ b/drivers/perf/arm_pmu.c @@ -28,6 +28,11 @@ static DEFINE_PER_CPU(struct arm_pmu *, cpu_armpmu); static DEFINE_PER_CPU(int, cpu_irq); +static inline u64 arm_pmu_max_period(void) +{ + return (1ULL << 32) - 1; +} + static int armpmu_map_cache_event(const unsigned (*cache_map) [PERF_COUNT_HW_CACHE_MAX] @@ -114,8 +119,10 @@ int armpmu_event_set_period(struct perf_event *event) struct hw_perf_event *hwc = &event->hw; s64 left = local64_read(&hwc->period_left); s64 period = hwc->sample_period; + u64 max_period; int ret = 0; + max_period = arm_pmu_max_period(); if (unlikely(left <= -period)) { left = period; local64_set(&hwc->period_left, left); @@ -136,8 +143,8 @@ int armpmu_event_set_period(struct perf_event *event) * effect we are reducing max_period to account for * interrupt latency (and we are being very conservative). */ - if (left > (armpmu->max_period >> 1)) - left = armpmu->max_period >> 1; + if (left > (max_period >> 1)) + left = (max_period >> 1); local64_set(&hwc->prev_count, (u64)-left); @@ -153,6 +160,7 @@ u64 armpmu_event_update(struct perf_event *event) struct arm_pmu *armpmu = to_arm_pmu(event->pmu); struct hw_perf_event *hwc = &event->hw; u64 delta, prev_raw_count, new_raw_count; + u64 max_period = arm_pmu_max_period(); again: prev_raw_count = local64_read(&hwc->prev_count); @@ -162,7 +170,7 @@ again: new_raw_count) != prev_raw_count) goto again; - delta = (new_raw_count - prev_raw_count) & armpmu->max_period; + delta = (new_raw_count - prev_raw_count) & max_period; local64_add(delta, &event->count); local64_sub(delta, &hwc->period_left); @@ -402,7 +410,7 @@ __hw_perf_event_init(struct perf_event *event) * is far less likely to overtake the previous one unless * you have some serious IRQ latency issues. */ - hwc->sample_period = armpmu->max_period >> 1; + hwc->sample_period = arm_pmu_max_period() >> 1; hwc->last_period = hwc->sample_period; local64_set(&hwc->period_left, hwc->sample_period); } |