[PATCH V6 7/7] drivers: perf: arm_pmu: Enable branch stack sampling event
James Clark
james.clark at arm.com
Thu Dec 8 03:43:49 PST 2022
On 08/12/2022 08:44, Anshuman Khandual wrote:
> Now that all the required pieces are already in place, just enable the perf
> branch stack sampling event on supported platforms, removing the gate which
> blocks it unconditionally in armpmu_event_init(). Instead a quick probe can
> be initiated first via arm_pmu_branch_stack_supported().
>
All the issues from the previous versions seem to be resolved now:
Tested-by: James Clark <james.clark at arm.com>
> Cc: Catalin Marinas <catalin.marinas at arm.com>
> Cc: Mark Rutland <mark.rutland at arm.com>
> Cc: Will Deacon <will at kernel.org>
> Cc: linux-kernel at vger.kernel.org
> Cc: linux-arm-kernel at lists.infradead.org
> Signed-off-by: Anshuman Khandual <anshuman.khandual at arm.com>
> ---
> drivers/perf/arm_pmu.c | 3 +--
> 1 file changed, 1 insertion(+), 2 deletions(-)
>
> diff --git a/drivers/perf/arm_pmu.c b/drivers/perf/arm_pmu.c
> index 66880a4bb248..52a93b9bcbda 100644
> --- a/drivers/perf/arm_pmu.c
> +++ b/drivers/perf/arm_pmu.c
> @@ -510,8 +510,7 @@ static int armpmu_event_init(struct perf_event *event)
> !cpumask_test_cpu(event->cpu, &armpmu->supported_cpus))
> return -ENOENT;
>
> - /* does not support taken branch sampling */
> - if (has_branch_stack(event))
> + if (has_branch_stack(event) && !arm_pmu_branch_stack_supported(armpmu))
> return -EOPNOTSUPP;
>
> if (armpmu->map_event(event) == -ENOENT)
More information about the linux-arm-kernel
mailing list