Messages in this thread | | | Subject | Re: [PATCH v2 7/8] drivers/perf: arm_pmu: Handle 47 bit counters | From | Hector Martin <> | Date | Sun, 12 Dec 2021 16:26:18 +0900 |
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On 01/12/2021 22.49, Marc Zyngier wrote: > 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 >
Reviewed-by: Hector Martin <marcan@marcan.st>
-- Hector Martin (marcan@marcan.st) Public Key: https://mrcn.st/pub
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