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lib: sbi: Fix counter index calculation for SBI_PMU_CFG_FLAG_SKIP_MATCH
As per the SBI specification, we should "unconditionally select the first counter from the set of counters specified by the counter_idx_base and counter_idx_mask", so implement this behaviour. Suggested-by: Atish Patra <atishp@atishpatra.org> Signed-off-by: Alexandre Ghiti <alexghiti@rivosinc.com> Reviewed-by: Atish Patra <atishp@rivosinc.com>
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1 changed files with 7 additions and 2 deletions
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@ -736,10 +736,15 @@ int sbi_pmu_ctr_cfg_match(unsigned long cidx_base, unsigned long cidx_mask,
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/* The caller wants to skip the match because it already knows the
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* counter idx for the given event. Verify that the counter idx
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* is still valid.
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* As per the specification, we should "unconditionally select
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* the first counter from the set of counters specified by the
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* counter_idx_base and counter_idx_mask".
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*/
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if (active_events[hartid][cidx_base] == SBI_PMU_EVENT_IDX_INVALID)
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unsigned long cidx_first = cidx_base + sbi_ffs(cidx_mask);
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if (active_events[hartid][cidx_first] == SBI_PMU_EVENT_IDX_INVALID)
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return SBI_EINVAL;
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ctr_idx = cidx_base;
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ctr_idx = cidx_first;
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goto skip_match;
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}
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