From 1280f12f56a15abde23503ba876343e5f201c9c2 Mon Sep 17 00:00:00 2001 From: Marc Zyngier Date: Tue, 8 Feb 2022 18:56:03 +0000 Subject: [PATCH] drivers/perf: arm_pmu: Handle 47 bit counters The current ARM PMU framework can only deal with 32 or 64bit counters. Teach it about a 47bit flavour. Yes, this is odd. Reviewed-by: Hector Martin Signed-off-by: Marc Zyngier Signed-off-by: Will Deacon --- 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 295cc79..0a9ed1a 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 2512e2f..0407a38 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 -- 2.7.4