6.6-stable review patch. If anyone has any objections, please let me know.
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From: Samuel Holland samuel.holland@sifive.com
[ 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 samuel.holland@sifive.com Signed-off-by: Atish Patra atishp@rivosinc.com Link: https://lore.kernel.org/r/20240628-misc_perf_fixes-v4-2-e01cfddcf035@rivosin... Signed-off-by: Palmer Dabbelt palmer@rivosinc.com Signed-off-by: Sasha Levin sashal@kernel.org --- 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 d80b4b09152df..ae16ecb15f2d9 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)