linux-kernel - Re: [PATCH V2 1/3] perf/x86: Add new event for AUX output counter index

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Date:   Mon, 5 Jul 2021 09:24:00 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Adrian Hunter <adrian.hunter@...el.com>
Cc:     Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>, Leo Yan <leo.yan@...aro.org>,
        Kan Liang <kan.liang@...ux.intel.com>, x86@...nel.org,
        linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH V2 1/3] perf/x86: Add new event for AUX output counter
 index

On Thu, Jul 01, 2021 at 04:17:30PM +0300, Adrian Hunter wrote:
> diff --git a/arch/x86/events/intel/core.c b/arch/x86/events/intel/core.c
> index e28892270c58..7a7c3b18acec 100644
> --- a/arch/x86/events/intel/core.c
> +++ b/arch/x86/events/intel/core.c
> @@ -2400,6 +2400,12 @@ static void intel_pmu_disable_event(struct perf_event *event)
>  		intel_pmu_pebs_disable(event);
>  }
>  
> +static void intel_pmu_assign_event(struct perf_event *event, int idx)
> +{
> +	if (is_pebs_pt(event))
> +		perf_report_aux_output_id(event, idx);
> +}
> +
>  static void intel_pmu_del_event(struct perf_event *event)
>  {
>  	if (needs_branch_stack(event))
> @@ -4596,6 +4602,7 @@ static __initconst const struct x86_pmu intel_pmu = {
>  	.enable_all		= intel_pmu_enable_all,
>  	.enable			= intel_pmu_enable_event,
>  	.disable		= intel_pmu_disable_event,
> +	.assign			= intel_pmu_assign_event,
>  	.add			= intel_pmu_add_event,
>  	.del			= intel_pmu_del_event,
>  	.read			= intel_pmu_read_event,

How about we only set that method (or clear it again) when
intel_cap.pebs_output_pt_available ?

Other than that, this looks good to me.