linux-kernel - Re: [PATCH 03/12] perf/x86/intel: Add perf core PMU support for Sapphire Rapids

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Message-ID: <YBAqnSlLUpBHOWRY@hirez.programming.kicks-ass.net>
Date:   Tue, 26 Jan 2021 15:43:41 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     kan.liang@...ux.intel.com
Cc:     acme@...nel.org, mingo@...nel.org, linux-kernel@...r.kernel.org,
        eranian@...gle.com, namhyung@...nel.org, jolsa@...hat.com,
        ak@...ux.intel.com, yao.jin@...ux.intel.com
Subject: Re: [PATCH 03/12] perf/x86/intel: Add perf core PMU support for
 Sapphire Rapids

On Tue, Jan 19, 2021 at 12:38:22PM -0800, kan.liang@...ux.intel.com wrote:
> @@ -2319,6 +2474,17 @@ static void __icl_update_topdown_event(struct perf_event *event,
>  {
>  	u64 delta, last = 0;
>  
> +	/*
> +	 * Although the unsupported topdown events are not exposed to users,
> +	 * users may mistakenly use the unsupported events via RAW format.
> +	 * For example, using L2 topdown event, cpu/event=0x00,umask=0x84/,
> +	 * on Ice Lake. In this case, the scheduler follows the unknown
> +	 * event handling and assigns a GP counter to the event.
> +	 * Check the case, and avoid updating unsupported events.
> +	 */
> +	if (event->hw.idx < INTEL_PMC_IDX_FIXED)
> +		return;
> +
>  	delta = icl_get_topdown_value(event, slots, metrics);
>  	if (last_slots)
>  		last = icl_get_topdown_value(event, last_slots, last_metrics);

Is this a separate patch?