From mboxrd@z Thu Jan 1 00:00:00 1970 From: suzuki.poulose@arm.com (Suzuki K. Poulose) Date: Mon, 25 Jan 2016 11:21:07 +0000 Subject: [PATCH v6 02/12] arm-cci: Group writes to counter In-Reply-To: <1453720877-24962-1-git-send-email-suzuki.poulose@arm.com> References: <1453720877-24962-1-git-send-email-suzuki.poulose@arm.com> Message-ID: <1453720877-24962-3-git-send-email-suzuki.poulose@arm.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org 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 Cc: Punit Agrawal Signed-off-by: Suzuki K. Poulose --- 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