[PATCH v2 7/8] drivers/perf: arm_pmu: Handle 47 bit counters
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STALE1774d
SUPERSEDED
From: Marc Zyngier <maz@kernel.org>
Date: 2021-12-01 13:50:40
Also in:
linux-arm-kernel, lkml
Subsystem:
arm pmu profiling and debugging, the rest · Maintainers:
Will Deacon, Mark Rutland, Linus Torvalds
Revision v2 of 5 in this series.
Revisions (5)
The current ARM PMU framework can only deal with 32 or 64bit counters. Teach it about a 47bit flavour. Yes, this is odd. Signed-off-by: Marc Zyngier <maz@kernel.org> --- drivers/perf/arm_pmu.c | 2 ++ include/linux/perf/arm_pmu.h | 2 ++ 2 files changed, 4 insertions(+)
diff --git a/drivers/perf/arm_pmu.c b/drivers/perf/arm_pmu.c
index 295cc7952d0e..0a9ed1a061ac 100644
--- a/drivers/perf/arm_pmu.c
+++ b/drivers/perf/arm_pmu.c@@ -109,6 +109,8 @@ static inline u64 arm_pmu_event_max_period(struct perf_event *event) { if (event->hw.flags & ARMPMU_EVT_64BIT) return GENMASK_ULL(63, 0); + else if (event->hw.flags & ARMPMU_EVT_47BIT) + return GENMASK_ULL(46, 0); else return GENMASK_ULL(31, 0); }
diff --git a/include/linux/perf/arm_pmu.h b/include/linux/perf/arm_pmu.h
index 2512e2f9cd4e..0407a38b470a 100644
--- a/include/linux/perf/arm_pmu.h
+++ b/include/linux/perf/arm_pmu.h@@ -26,6 +26,8 @@ */ /* Event uses a 64bit counter */ #define ARMPMU_EVT_64BIT 1 +/* Event uses a 47bit counter */ +#define ARMPMU_EVT_47BIT 2 #define HW_OP_UNSUPPORTED 0xFFFF #define C(_x) PERF_COUNT_HW_CACHE_##_x
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2.30.2