linux-kernel - Re: [PATCH 1/3] perf vendor events: For the Neoverse N2

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Message-ID: <2e1a7a96-4ec6-e1f2-5bd4-133480391053@huawei.com>
Date:   Tue, 7 Dec 2021 09:57:41 +0000
From:   John Garry <john.garry@...wei.com>
To:     Andrew Kilroy <andrew.kilroy@....com>,
        <linux-kernel@...r.kernel.org>, <linux-perf-users@...r.kernel.org>,
        <acme@...nel.org>
CC:     Will Deacon <will@...nel.org>,
        Mathieu Poirier <mathieu.poirier@...aro.org>,
        Leo Yan <leo.yan@...aro.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>,
        "Namhyung Kim" <namhyung@...nel.org>,
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH 1/3] perf vendor events: For the Neoverse N2

On 03/12/2021 12:35, Andrew Kilroy wrote:
> Updates the common and microarch json file to add counters
> available in the Neoverse N2 chip, but should also apply to other ArmV8
> and ArmV9 cpus.  Specified in ArmV8 architecture reference manual
> 
>    https://developer.arm.com/documentation/ddi0487/gb/?lang=en
> 
> Some of the counters added to armv8-common-and-microarch.json are
> specified in the ArmV9 architecture reference manual supplement
> (issue A.a):
> 
>    https://developer.arm.com/documentation/ddi0608/aa
> 
> The additional ArmV9 counters are
> 
>    TRB_WRAP
>    TRCEXTOUT0
>    TRCEXTOUT1
>    TRCEXTOUT2
>    TRCEXTOUT3
>    CTI_TRIGOUT4
>    CTI_TRIGOUT5
>    CTI_TRIGOUT6
>    CTI_TRIGOUT7
> 
> This patch also adds files in pmu-events/arch/arm64/arm/neoverse-n2 for
> perf list to output the counter names in categories.
> 
> A subsequent patch renames armv8-common-and-microarch.json and
> armv8-recommended.json to reflect that counters for armv9 are being
> added.

This commentary should be in a cover letter. Please do that.

And did you consider just adding a armv9-common-and-microarch.json and
armv9-recommended.json instead of adding to and renaming the v8 version?
I know that it creates scattered definitions, but we already have that in
dividing the common and the recommended JSONs.

Thanks,
John