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authorSuzuki K Poulose <suzuki.poulose@arm.com>2016-02-23 13:49:45 +0300
committerWill Deacon <will.deacon@arm.com>2016-03-01 02:23:16 +0300
commita53eb5c62f214a72e00775126a3bbd11579e2969 (patch)
treed1eee20fa55221dd3edeaabde0aa220ee9c38417 /drivers/bus
parent0f17380c1aae80fe0f2fa495cb627ba750b693de (diff)
downloadlinux-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.c15
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;