Unverified Commit 7dd646cf authored by Samuel Holland's avatar Samuel Holland Committed by Palmer Dabbelt
Browse files

drivers/perf: riscv: Reset the counter to hpmevent mapping while starting cpus 



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: default avatarSamuel Holland <samuel.holland@sifive.com>
Signed-off-by: default avatarAtish Patra <atishp@rivosinc.com>
Link: https://lore.kernel.org/r/20240628-misc_perf_fixes-v4-2-e01cfddcf035@rivosinc.com


Signed-off-by: default avatarPalmer Dabbelt <palmer@rivosinc.com>
parent a3f24e83

drivers/perf/riscv_pmu_sbi.c

+1 −1
Original line number Diff line number Diff line
@@ -762,7 +762,7 @@ 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)