[PATCH v1 1/2] perf arm-spe: Support multiple Arm SPE PMUs

[Ian Rogers]

On Sun, Jun 23, 2024 at 6:34 AM Leo Yan <leo.yan at arm.com> wrote:
>
> A platform can have more than one Arm SPE PMU. For example, a system
> with multiple clusters may have each cluster enabled with its own Arm
> SPE instance. In such case, the PMU devices will be named 'arm_spe_0',
> 'arm_spe_1', and so on.
>
> Currently, the tool only supports 'arm_spe_0'. This commit extends
> support to multiple Arm SPE PMUs by detecting the substring 'arm_spe'.
>
> Signed-off-by: Leo Yan <leo.yan at arm.com>
> ---
>  tools/perf/arch/arm/util/pmu.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/tools/perf/arch/arm/util/pmu.c b/tools/perf/arch/arm/util/pmu.c
> index 8b7cb68ba1a8..29cfa1e427ed 100644
> --- a/tools/perf/arch/arm/util/pmu.c
> +++ b/tools/perf/arch/arm/util/pmu.c
> @@ -27,7 +27,7 @@ void perf_pmu__arch_init(struct perf_pmu *pmu __maybe_unused)
>                 pmu->selectable = true;
>                 pmu->is_uncore = false;
>                 pmu->perf_event_attr_init_default = arm_spe_pmu_default_config;
> -               if (!strcmp(pmu->name, "arm_spe_0"))
> +               if (strstr(pmu->name, "arm_spe"))

Why not use strstarts?

Thanks,
Ian


>                         pmu->mem_events = perf_mem_events_arm;
>         } else if (strstarts(pmu->name, HISI_PTT_PMU_NAME)) {
>                 pmu->selectable = true;
> --
> 2.34.1
>