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perf/arm_dsu: Allow standard cycles events 

Since we do not use the divide-by-64 option, there should be no
significant difference between the dedicated cycle counter and the
standard cycles event. Since using the latter on DSU-120 now has
the side-effect of allowing multiple cycles events to be scheduled
simultaneously (beneficial for multiple cycle-based metrics), there
seems little reason not to allow the same on older DSUs as well.

Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Will Deacon <will@kernel.org>
master
Robin Murphy 2025-12-15 13:05:00 +00:00 committed by Will Deacon
parent 85c0dbd8b6
commit 79448fa1f4
1 changed files with 2 additions and 3 deletions
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5
drivers/perf/arm_dsu_pmu.c
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@ -284,9 +284,8 @@ static int dsu_pmu_get_event_idx(struct dsu_hw_events *hw_events,
unsigned long *used_mask = hw_events->used_mask;
if (evtype == DSU_PMU_EVT_CYCLES && dsu_pmu->has_pmccntr) {
if (test_and_set_bit(DSU_PMU_IDX_CYCLE_COUNTER, used_mask))
return -EAGAIN;
return DSU_PMU_IDX_CYCLE_COUNTER;
if (!test_and_set_bit(DSU_PMU_IDX_CYCLE_COUNTER, used_mask))
return DSU_PMU_IDX_CYCLE_COUNTER;
}
idx = find_first_zero_bit(used_mask, dsu_pmu->num_counters);