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References: <20230126204444.2204061-1-zalbassam@google.com> <86fsbgyutf.wl-maz@kernel.org>
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From:   Zaid Al-Bassam <zalbassam@google.com>
Date:   Fri, 10 Feb 2023 11:58:36 -0500
Message-ID: <CALBRaFmj4Nvr=bjti+yCrRhtX61_aJhiCRDfbMJPLDhqVW8u1A@mail.gmail.com>
Subject: Re: [PATCH 0/8] perf: arm: Make PMUv3 driver available for aarch32
To:     Marc Zyngier <maz@kernel.org>
Cc:     Jesus Sanchez-Palencia <jesussanp@google.com>,
        Russell King <linux@armlinux.org.uk>,
        Catalin Marinas <catalin.marinas@arm.com>,
        Will Deacon <will@kernel.org>,
        Peter Zijlstra <peterz@infradead.org>,
        Ingo Molnar <mingo@redhat.com>,
        Arnaldo Carvalho de Melo <acme@kernel.org>,
        Mark Rutland <mark.rutland@arm.com>,
        Alexander Shishkin <alexander.shishkin@linux.intel.com>,
        Jiri Olsa <jolsa@kernel.org>,
        Namhyung Kim <namhyung@kernel.org>,
        James Morse <james.morse@arm.com>,
        Suzuki K Poulose <suzuki.poulose@arm.com>,
        Oliver Upton <oliver.upton@linux.dev>,
        Zenghui Yu <yuzenghui@huawei.com>,
        linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org,
        linux-perf-users@vger.kernel.org, kvmarm@lists.linux.dev,
        kvmarm@lists.cs.columbia.edu
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Thank you Marc for reviewing the change and fixing the issues, I have
picked up your patches and sent out v2. Tested on Cortex-A32.

Best Regards,
Zaid Al-Bassam


On Wed, Feb 8, 2023 at 11:40 AM Marc Zyngier <maz@kernel.org> wrote:
>
> On Thu, 26 Jan 2023 20:44:36 +0000,
> Zaid Al-Bassam <zalbassam@google.com> wrote:
> >
> > Currently, PMUv3 driver is only available for ARMv8 aarch64
> > platforms, ARMv8 running in aarch32 mode dont have access to
> > the driver. This is, especially, a problem for ARMv8 platforms
> > that only have aarch32 support, like the Cortex-A32.
>
> FWIW, I've pushed out my own interpretation of this series to [1],
> including the changes I suggested. The results seems to correctly work
> in a 32bit guest on a 64bit host, which is what I (used to) care
> about.
>
> Feel free to pick it up.
>
>         M.
>
> [1] https://git.kernel.org/pub/scm/linux/kernel/git/maz/arm-platforms.git/log/?h=arm/pmuv3
>
> --
> Without deviation from the norm, progress is not possible.