Messages in this thread | | | Date | Mon, 07 Mar 2022 15:55:44 +0000 | From | Marc Zyngier <> | Subject | Re: [PATCH v5 00/10] drivers/perf: CPU PMU driver for Apple M1 |
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On Tue, 08 Feb 2022 18:55:54 +0000, Marc Zyngier <maz@kernel.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.
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