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Groups > linux.kernel > #1340537

[PATCH 03/13] 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: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Suzuki K. Poulose <suzuki.poulose@arm.com>
---
 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 5fb1c06..6a76ac7 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;
-- 
1.7.9.5

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Thread

[PATCH 00/13] arm-cci: PMU driver updates for 4.6 Suzuki K Poulose <suzuki.poulose@arm.com> - 2016-02-23 12:00 +0100
  [PATCH 05/13] arm-cci: Delay PMU counter writes to pmu::pmu_enable Suzuki K Poulose <suzuki.poulose@arm.com> - 2016-02-23 12:00 +0100
  [PATCH 07/13] arm-cci: Get the status of a counter Suzuki K Poulose <suzuki.poulose@arm.com> - 2016-02-23 12:00 +0100
  [PATCH 03/13] arm-cci: Group writes to counter Suzuki K Poulose <suzuki.poulose@arm.com> - 2016-02-23 12:00 +0100
  [PATCH 06/13] arm-cci: write_counter: Remove redundant check Suzuki K Poulose <suzuki.poulose@arm.com> - 2016-02-23 12:00 +0100
  [PATCH 09/13] arm-cci: Add helper to enable PMU without synchornising counters Suzuki K Poulose <suzuki.poulose@arm.com> - 2016-02-23 12:00 +0100
  [PATCH 08/13] arm-cci: Add routines to save/restore all counters Suzuki K Poulose <suzuki.poulose@arm.com> - 2016-02-23 12:00 +0100
  [PATCH 11/13] arm-cci: CCI-500: Work around PMU counter writes Suzuki K Poulose <suzuki.poulose@arm.com> - 2016-02-23 12:00 +0100
  Re: [PATCH 00/13] arm-cci: PMU driver updates for 4.6 Will Deacon <will.deacon@arm.com> - 2016-02-23 12:50 +0100
    Re: [PATCH 00/13] arm-cci: PMU driver updates for 4.6 "Suzuki K. Poulose" <Suzuki.Poulose@arm.com> - 2016-02-23 15:00 +0100
      Re: [PATCH 00/13] arm-cci: PMU driver updates for 4.6 Olof Johansson <olof@lixom.net> - 2016-02-24 18:00 +0100
        Re: [PATCH 00/13] arm-cci: PMU driver updates for 4.6 Will Deacon <will.deacon@arm.com> - 2016-02-24 18:20 +0100
          Re: [PATCH 00/13] arm-cci: PMU driver updates for 4.6 Olof Johansson <olof@lixom.net> - 2016-02-24 19:50 +0100
            Re: [PATCH 00/13] arm-cci: PMU driver updates for 4.6 Will Deacon <will.deacon@arm.com> - 2016-02-26 17:50 +0100

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