From c56e0e6a9e0da8c48d6836e7ee6c97bc54d755c6 Mon Sep 17 00:00:00 2001 From: Samuel Holland Date: Fri, 28 Jun 2024 00:51:42 -0700 Subject: [PATCH] drivers/perf: riscv: Reset the counter to hpmevent mapping while starting cpus BugLink: https://bugs.launchpad.net/bugs/2078304 [ Upstream commit 7dd646cf745c34d31e7ed2a52265e9ca8308f58f ] Currently, we stop all the counters while a new cpu is brought online. However, the hpmevent to counter mappings are not reset. The firmware may have some stale encoding in their mapping structure which may lead to undesirable results. We have not encountered such scenario though. Signed-off-by: Samuel Holland Signed-off-by: Atish Patra Link: https://lore.kernel.org/r/20240628-misc_perf_fixes-v4-2-e01cfddcf035@rivosinc.com Signed-off-by: Palmer Dabbelt Signed-off-by: Sasha Levin Signed-off-by: Portia Stephens Signed-off-by: Stefan Bader --- drivers/perf/riscv_pmu_sbi.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/perf/riscv_pmu_sbi.c b/drivers/perf/riscv_pmu_sbi.c index 452aab49db1e..e30f1d530780 100644 --- a/drivers/perf/riscv_pmu_sbi.c +++ b/drivers/perf/riscv_pmu_sbi.c @@ -611,7 +611,7 @@ static inline void pmu_sbi_stop_all(struct riscv_pmu *pmu) * which may include counters that are not enabled yet. */ sbi_ecall(SBI_EXT_PMU, SBI_EXT_PMU_COUNTER_STOP, - 0, pmu->cmask, 0, 0, 0, 0); + 0, pmu->cmask, SBI_PMU_STOP_FLAG_RESET, 0, 0, 0); } static inline void pmu_sbi_stop_hw_ctrs(struct riscv_pmu *pmu)