[PATCH v6 02/12] arm-cci: Group writes to counter
flat view
STALE3894d
From: suzuki.poulose@arm.com (Suzuki K. Poulose)
Date: 2016-01-25 11:21:32
Also in:
lkml
Subsystem:
the rest · Maintainer:
Linus Torvalds
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: Mark Rutland <mark.rutland@arm.com>
Cc: Punit Agrawal <redacted>
Signed-off-by: Suzuki K. Poulose <suzuki.poulose@arm.com>
---
Changes since V5:
- Use the prev_count from event->hw for the counter value, than
using a single value for all the counters.
---
drivers/bus/arm-cci.c | 15 +++++++++++++++
1 file changed, 15 insertions(+)
diff --git a/drivers/bus/arm-cci.c b/drivers/bus/arm-cci.c
index ee47e6b..936fa9b 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, (u32)local64_read(&event->hw.prev_count)); + } +} + static u64 pmu_event_update(struct perf_event *event) { struct hw_perf_event *hwc = &event->hw;
--
1.7.9.5