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| author | Suzuki K Poulose <suzuki.poulose@arm.com> | 2016-02-23 10:49:45 +0000 |
|---|---|---|
| committer | Will Deacon <will.deacon@arm.com> | 2016-02-29 23:23:16 +0000 |
| commit | a53eb5c62f214a72e00775126a3bbd11579e2969 (patch) | |
| tree | d1eee20fa55221dd3edeaabde0aa220ee9c38417 /drivers/bus | |
| parent | 0f17380c1aae80fe0f2fa495cb627ba750b693de (diff) | |
| download | linux-a53eb5c62f214a72e00775126a3bbd11579e2969.tar.gz linux-a53eb5c62f214a72e00775126a3bbd11579e2969.tar.xz | |
arm-cci: Group writes to counter
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>
Diffstat (limited to 'drivers/bus')
| -rw-r--r-- | drivers/bus/arm-cci.c | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/drivers/bus/arm-cci.c b/drivers/bus/arm-cci.c index 5fb1c06e0020..6a76ac76fb8b 100644 --- a/drivers/bus/arm-cci.c +++ b/drivers/bus/arm-cci.c @@ -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; |