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drivers/perf: arm_pmu: Handle 47 bit counters

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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 <marcan@marcan.st>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Signed-off-by: Will Deacon <will@kernel.org>
This commit is contained in:
Marc Zyngier 2022-02-08 18:56:03 +00:00 committed by Will Deacon
parent 47804aab73
commit 1280f12f56
2 changed files with 4 additions and 0 deletions
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2
drivers/perf/arm_pmu.c
View File

@ -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);
}

2
include/linux/perf/arm_pmu.h
View File

@ -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