From: Robin Murphy Date: Mon, 15 Dec 2025 13:05:00 +0000 (+0000) Subject: perf/arm_dsu: Allow standard cycles events X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=79448fa1f495c3e3b7119e53bedc3cce273aa95f;p=thirdparty%2Fkernel%2Flinux.git 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 Signed-off-by: Will Deacon --- diff --git a/drivers/perf/arm_dsu_pmu.c b/drivers/perf/arm_dsu_pmu.c index 56c592f0dae3a..32b0dd7c693b3 100644 --- a/drivers/perf/arm_dsu_pmu.c +++ b/drivers/perf/arm_dsu_pmu.c @@ -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);