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drivers/perf: arm_spe: Expose saturating counter to 16-bit

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In order to acquire more accurate latency, Armv8.8[1] has defined the
CountSize field to 16-bit saturating counters when it's 0b0011.

Let's support this new feature and expose its to user under sysfs.

[1] https://developer.arm.com/documentation/ddi0487/latest

Cc: Will Deacon <will@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Shaokun Zhang <zhangshaokun@hisilicon.com>
Link: https://lore.kernel.org/r/20220429063307.63251-1-zhangshaokun@hisilicon.com
Signed-off-by: Will Deacon <will@kernel.org>
This commit is contained in:
Shaokun Zhang 2022-04-29 14:33:07 +08:00 committed by Will Deacon
parent 23760a0144
commit 47a9ed88a4
1 changed files with 3 additions and 0 deletions
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3
drivers/perf/arm_spe_pmu.c
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@ -1035,6 +1035,9 @@ static void __arm_spe_pmu_dev_probe(void *info)
fallthrough;
case 2:
spe_pmu->counter_sz = 12;
break;
case 3:
spe_pmu->counter_sz = 16;
}
dev_info(dev,