@@ -170,7 +170,6 @@ int riscv_pmu_event_set_period(struct perf_event *event)
left = (max_period >> 1);
local64_set(&hwc->prev_count, (u64)-left);
- perf_event_update_userpage(event);
return overflow;
}
@@ -527,6 +527,7 @@ static inline void pmu_sbi_start_overflow_mask(struct riscv_pmu *pmu,
init_val = local64_read(&hwc->prev_count) & max_period;
sbi_ecall(SBI_EXT_PMU, SBI_EXT_PMU_COUNTER_START, idx, 1,
flag, init_val, init_val >> 32, 0);
+ perf_event_update_userpage(event);
}
ctr_ovf_mask = ctr_ovf_mask >> 1;
idx++;
Currently, riscv_pmu_event_set_period updates the userpage mapping. However, the caller of riscv_pmu_event_set_period should update the userpage mapping because the counter can not be updated/started from set_period function in counter overflow path. Invoke the perf_event_update_userpage at the caller so that it doesn't get invoked twice during counter start path. Fixes: f5bfa23f576f ("RISC-V: Add a perf core library for pmu drivers") Signed-off-by: Atish Patra <atishp@rivosinc.com> --- drivers/perf/riscv_pmu.c | 1 - drivers/perf/riscv_pmu_sbi.c | 1 + 2 files changed, 1 insertion(+), 1 deletion(-)