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David E. Garcia Porras
c5077d497d
Align the PMU extension implementation with the error codes required by the SBI v3.0 specification, chapter 11: - sbi_pmu_counter_start and sbi_pmu_counter_stop (secs 11.9-11.10, tables 39-42): the start_flags/stop_flags bits 2:(XLEN-1) are reserved and must be zero, so return SBI_ERR_INVALID_PARAM when any reserved flag bit is set. Introduce SBI_PMU_START_FLAGS_MASK and SBI_PMU_STOP_FLAGS_MASK for the valid bits of each function. - sbi_pmu_counter_start and sbi_pmu_counter_stop (tables 40 and 42): return SBI_ERR_ALREADY_STARTED / SBI_ERR_ALREADY_STOPPED when the set of counters includes a counter which is already started or stopped, instead of ignoring the error returned for each counter. - sbi_pmu_event_get_info (sec 11.14, table 47): the output word must indicate whether the event is supported, but firmware events were only matched against the hardware event map and were always reported as unsupported. Report a validated firmware event as supported. Signed-off-by: David E. Garcia Porras <david.garcia@aheadcomputing.com> Reviewed-by: Anup Patel <anup@brainfault.org> Link: https://lore.kernel.org/r/20260818210023.466462-4-david.garcia@aheadcomputing.com Signed-off-by: Anup Patel <anup@brainfault.org>