openhcl/aarch64: pmu reported via DT on kernel 6.12 seems to be missing something
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Description
I see the following with the 6.12 OpenHCL kernel:
[kmsg]: [0.031884] armv8-pmu pmu: hw perfevents: no irqs for PMU, sampling events not supported
[kmsg]: [0.032059] hw perfevents: enabled with armv8_pmuv3 PMU driver, 6 (0,8000001f) counters available
the sampling events not supported leads me to believe perf won't work, but it needs further investigation in the kernel what else needs to be specified in dt versus when we describe this in ACPI.
In the Linux direct 6.1, no such samping events not supported print exists, but it's unclear if perf actually works in 6.1 as I didn't try it.
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Research direction
Start by comparing the OpenHCL kernel 6.12 device-tree PMU description with how PMU details are described through ACPI. Reproduce the armv8-pmu messages and investigate whether perf sampling works; done means identifying any missing device-tree specification and confirming the corrected behavior.
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Assessment
- Tech stack
- linux
- Domain
- operating-systems
- Issue type
- Bug
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Stale
- Clarity
- Needs clarification
- Newbie friendliness
- 32/100