Check cntr_mask before using pmccntr to ensure it's available. With a partitioned PMU, there may be instances where pmccntr is being used by the guest and will ba absent from cntr_mask.
Signed-off-by: Colton Lewis <[email protected]> --- drivers/perf/arm_pmuv3.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/perf/arm_pmuv3.c b/drivers/perf/arm_pmuv3.c index 1cceb1f614515..7ff3139dda893 100644 --- a/drivers/perf/arm_pmuv3.c +++ b/drivers/perf/arm_pmuv3.c @@ -993,6 +993,9 @@ static bool armv8pmu_can_use_pmccntr(struct pmu_hw_events *cpuc, if (evtype != ARMV8_PMUV3_PERFCTR_CPU_CYCLES) return false; + if (!test_bit(ARMV8_PMU_CYCLE_IDX, cpu_pmu->cntr_mask)) + return false; + /* * A CPU_CYCLES event with threshold counting cannot use PMCCNTR_EL0 * since it lacks threshold support. -- 2.54.0.545.g6539524ca2-goog
