diff options
Diffstat (limited to 'drivers/perf/riscv_pmu.c')
| -rw-r--r-- | drivers/perf/riscv_pmu.c | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/drivers/perf/riscv_pmu.c b/drivers/perf/riscv_pmu.c index 432ad2e80ce3..80c052e93f9e 100644 --- a/drivers/perf/riscv_pmu.c +++ b/drivers/perf/riscv_pmu.c @@ -38,7 +38,15 @@ void arch_perf_update_userpage(struct perf_event *event, userpg->cap_user_time_short = 0; userpg->cap_user_rdpmc = riscv_perf_user_access(event); - userpg->pmc_width = 64; +#ifdef CONFIG_RISCV_PMU + /* + * The counters are 64-bit but the priv spec doesn't mandate all the + * bits to be implemented: that's why, counter width can vary based on + * the cpu vendor. + */ + if (userpg->cap_user_rdpmc) + userpg->pmc_width = to_riscv_pmu(event->pmu)->ctr_get_width(event->hw.idx) + 1; +#endif do { rd = sched_clock_read_begin(&seq); |