linux-kernel - Re: [PATCH v4 7/8] perf: Add perf_event

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Message-ID: <Y941O6eVNfpS3F5b@hirez.programming.kicks-ass.net>
Date:   Sat, 4 Feb 2023 11:36:43 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Rob Herring <robh@...nel.org>
Cc:     Will Deacon <will@...nel.org>, Mark Rutland <mark.rutland@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        Marc Zyngier <maz@...nel.org>,
        James Morse <james.morse@....com>,
        Alexandru Elisei <alexandru.elisei@....com>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        Oliver Upton <oliver.upton@...ux.dev>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Mark Brown <broonie@...nel.org>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        kvmarm@...ts.linux.dev, linux-perf-users@...r.kernel.org,
        James Clark <james.clark@....com>
Subject: Re: [PATCH v4 7/8] perf: Add perf_event_attr::config3

On Mon, Jan 09, 2023 at 01:26:23PM -0600, Rob Herring wrote:
> Arm SPEv1.2 adds another 64-bits of event filtering control. As the
> existing perf_event_attr::configN fields are all used up for SPE PMU, an
> additional field is needed. Add a new 'config3' field.
> 
> Tested-by: James Clark <james.clark@....com>
> Signed-off-by: Rob Herring <robh@...nel.org>
> ---
> There's still an unresolved discussion about validating 'config3' with
> the options laid out here[1].
> 
> v4:
>  - Rebase on v6.2-rc1
> v3:
>  - No change
> v2:
>  - Drop tools/ side update
> 
> [1] https://lore.kernel.org/all/Y49ttrv6W5k3ZNYw@FVFF77S0Q05N.cambridge.arm.com/
> ---
>  include/uapi/linux/perf_event.h | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/include/uapi/linux/perf_event.h b/include/uapi/linux/perf_event.h
> index ccb7f5dad59b..37675437b768 100644
> --- a/include/uapi/linux/perf_event.h
> +++ b/include/uapi/linux/perf_event.h
> @@ -374,6 +374,7 @@ enum perf_event_read_format {
>  #define PERF_ATTR_SIZE_VER5	112	/* add: aux_watermark */
>  #define PERF_ATTR_SIZE_VER6	120	/* add: aux_sample_size */
>  #define PERF_ATTR_SIZE_VER7	128	/* add: sig_data */
> +#define PERF_ATTR_SIZE_VER8	136	/* add: config3 */
>  
>  /*
>   * Hardware event_id to monitor via a performance monitoring event:
> @@ -515,6 +516,8 @@ struct perf_event_attr {
>  	 * truncated accordingly on 32 bit architectures.
>  	 */
>  	__u64	sig_data;
> +
> +	__u64	config3; /* extension of config2 */
>  };

Yeah, that was bound to happen I suppose..

Acked-by: Peter Zijlstra (Intel) <peterz@...radead.org>