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arm-cci: Group writes to counter

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Add a helper to group the writes to PMU counter, this will be
used to delay setting the event period to pmu::pmu_enable()

Cc: Punit Agrawal <punit.agrawal@arm.com>
Acked-by: Olof Johansson <olof@lixom.net>
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>
This commit is contained in:
Suzuki K Poulose 2016-02-23 10:49:45 +00:00 committed by Will Deacon
parent 0f17380c1a
commit a53eb5c62f
1 changed files with 15 additions and 0 deletions
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15
drivers/bus/arm-cci.c
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@ -771,6 +771,21 @@ static void pmu_write_counter(struct perf_event *event, u32 value)
pmu_write_register(cci_pmu, value, idx, CCI_PMU_CNTR);
}
static void __maybe_unused
pmu_write_counters(struct cci_pmu *cci_pmu, unsigned long *mask)
{
int i;
struct cci_pmu_hw_events *cci_hw = &cci_pmu->hw_events;
for_each_set_bit(i, mask, cci_pmu->num_cntrs) {
struct perf_event *event = cci_hw->events[i];
if (WARN_ON(!event))
continue;
pmu_write_counter(event, local64_read(&event->hw.prev_count));
}
}
static u64 pmu_event_update(struct perf_event *event)
{
struct hw_perf_event *hwc = &event->hw;