linux-kernel - Re: [PATCH v5 6/7] drivers/perf: Add support for ARMv8.2 Statistical Profiling Extension

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Message-Id: <20171024034251.81e01386b8074683a40d31e1@arm.com>
Date:   Tue, 24 Oct 2017 03:42:51 -0500
From:   Kim Phillips <kim.phillips@....com>
To:     Arnaldo Carvalho de Melo <acme@...hat.com>
Cc:     Will Deacon <will.deacon@....com>,
        <linux-arm-kernel@...ts.infradead.org>, <marc.zyngier@....com>,
        <mark.rutland@....com>, <tglx@...utronix.de>,
        <peterz@...radead.org>, <alexander.shishkin@...ux.intel.com>,
        <robh@...nel.org>, <suzuki.poulose@....com>, <pawel.moll@....com>,
        <mathieu.poirier@...aro.org>, <mingo@...hat.com>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v5 6/7] drivers/perf: Add support for ARMv8.2
 Statistical Profiling Extension

On Mon, 2 Oct 2017 18:35:24 -0500
Kim Phillips <kim.phillips@....com> wrote:

> On Mon, 2 Oct 2017 13:49:30 -0300
> Arnaldo Carvalho de Melo <acme@...hat.com> wrote:
> > I'm all for more informative messages, and if you guys agree on how to
> > provide the info in a way that combined with logic in evsel.c, I'd say
> > do what Will suggested, post a patch series and include usage examples,
> > before and after.
> 
> I'll figure out how to get the PMU in evsel.c's strerror fn, and give it
> another shot.  I don't think it'll be a big problem for the SPE driver
> itself, it's just some of the other drivers have long lists of reasons
> to return -EXXXX, and I don't think evsel.c's strerror fn should be
> able to handle all that.

See this example for the arm-ccn driver:

http://lists.infradead.org/pipermail/linux-arm-kernel/2017-October/538924.html

Please follow up on that thread.

Thanks,

Kim