On Tue, 08 Feb 2022 18:55:54 +0000, Marc Zyngier <maz@xxxxxxxxxx> 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.
