diff options
| author | Shaokun Zhang <zhangshaokun@hisilicon.com> | 2022-04-29 14:33:07 +0800 |
|---|---|---|
| committer | Will Deacon <will@kernel.org> | 2022-05-06 15:10:00 +0100 |
| commit | 47a9ed88a4fc6c67ea7f1d65df28d2eb6a89bbbb (patch) | |
| tree | 5993c7accc9614d970136fb235153ba8fe4b8606 | |
| parent | 23760a0144173ef398522fbcc1dbe79521b5caf9 (diff) | |
| download | linux-47a9ed88a4fc6c67ea7f1d65df28d2eb6a89bbbb.tar.bz2 | |
drivers/perf: arm_spe: Expose saturating counter to 16-bit
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>
| -rw-r--r-- | drivers/perf/arm_spe_pmu.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/perf/arm_spe_pmu.c b/drivers/perf/arm_spe_pmu.c index d44bcc29d99c..db670b265897 100644 --- a/drivers/perf/arm_spe_pmu.c +++ b/drivers/perf/arm_spe_pmu.c @@ -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, |