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SubjectRe: [PATCH v5 00/10] drivers/perf: CPU PMU driver for Apple M1
On Tue, 08 Feb 2022 18:55:54 +0000,
Marc Zyngier <> 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.




Without deviation from the norm, progress is not possible.

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