linux-kernel - Re: [PATCH v5 00/10] drivers/perf: CPU PMU driver for Apple M1

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Date:   Mon, 07 Mar 2022 15:55:44 +0000
From:   Marc Zyngier <maz@...nel.org>
To:     Will Deacon <will@...nel.org>,
        linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     Mark Rutland <mark.rutland@....com>,
        Hector Martin <marcan@...can.st>,
        Sven Peter <sven@...npeter.dev>,
        Alyssa Rosenzweig <alyssa@...enzweig.io>,
        Rob Herring <robh+dt@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Dougall <dougallj@...il.com>, kernel-team@...roid.com
Subject: Re: [PATCH v5 00/10] drivers/perf: CPU PMU driver for Apple M1

On Tue, 08 Feb 2022 18:55:54 +0000,
Marc Zyngier <maz@...nel.org> wrote:
> 
> The M1 SoC embeds a per-CPU PMU that has a very different programming
> interface compared to the architected PMUv3 that is normally present
> on standard implementations.
> 
> This small series adds a driver for this HW by leveraging the arm_pmu
> infrastructure, resulting in a rather simple driver.
> 
> Of course, we know next to nothing about the actual events this PMU
> counts, aside from CPU cycles and instructions. Everything else is
> undocumented (though as Dougall pointed out, someone could extract the
> relevant information from a macOS install if they wanted -- I don't).
> I'm looking at allowing the perf userspace tool to load the event
> descriptions at runtime, which would probably help.

[...]

FWIW, I have created two branches:

- [1] has the full series
- [2] has the irqchip/DT prefix of [1]

Both branches are stable, and I expect [2] to be used as a shared
branch between the irqchip and perf trees.

Thanks,

	M.

[1] https://git.kernel.org/pub/scm/linux/kernel/git/maz/arm-platforms.git/log/?h=hack/m1-pmu
[2] https://git.kernel.org/pub/scm/linux/kernel/git/maz/arm-platforms.git/log/?h=irq/aic-pmu

-- 
Without deviation from the norm, progress is not possible.