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). My hope is that this driver will help people to explore the event space and propose possible interpretations for these events using reproducible test cases. * From v1 [1]: - Added a few comments clarifying the event mapping to counters - Spelling fixes - Collected Acks from Rob [1] https://lore.kernel.org/r/20211113115429.4027571-1-maz@xxxxxxxxxx Marc Zyngier (8): dt-bindings: arm-pmu: Document Apple PMU compatible strings dt-bindings: apple,aic: Add CPU PMU per-cpu pseudo-interrupts irqchip/apple-aic: Add cpumasks for E and P cores irqchip/apple-aic: Wire PMU interrupts irqchip/apple-aic: Move PMU-specific registers to their own include file arm64: apple: t8301: Add PMU nodes drivers/perf: arm_pmu: Handle 47 bit counters drivers/perf: Add Apple icestorm/firestorm CPU PMU driver .../devicetree/bindings/arm/pmu.yaml | 2 + .../interrupt-controller/apple,aic.yaml | 2 + arch/arm64/boot/dts/apple/t8103.dtsi | 12 + arch/arm64/include/asm/apple_m1_pmu.h | 64 ++ drivers/irqchip/irq-apple-aic.c | 59 +- drivers/perf/Kconfig | 7 + drivers/perf/Makefile | 1 + drivers/perf/apple_m1_cpu_pmu.c | 637 ++++++++++++++++++ drivers/perf/arm_pmu.c | 2 + .../interrupt-controller/apple-aic.h | 2 + include/linux/perf/arm_pmu.h | 2 + 11 files changed, 768 insertions(+), 22 deletions(-) create mode 100644 arch/arm64/include/asm/apple_m1_pmu.h create mode 100644 drivers/perf/apple_m1_cpu_pmu.c -- 2.30.2
