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

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Message-ID: <Ya90lK/PqJDIrXlB@kernel.org>
Date:   Tue, 7 Dec 2021 11:49:56 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Andrew Kilroy <andrew.kilroy@....com>
Cc:     John Garry <john.garry@...wei.com>, linux-kernel@...r.kernel.org,
        linux-perf-users@...r.kernel.org, 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

Em Tue, Dec 07, 2021 at 12:13:16PM +0000, Andrew Kilroy escreveu:
> 
> 
> On 07/12/2021 09:57, John Garry wrote:
> > 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.
> > 
> 
> I considered it, but I wasn't sure what was preferable.  I thought I'd get
> some feedback.  Do you consider the separation important?  Any particular
> reason?

Applied the second patch, waiting for a conclusion to this discussion to
pick the other two patches.

- Arnaldo