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

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[ Upstream commit 7dd646cf74 ]

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@rivosinc.com
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Samuel Holland 2024-06-28 00:51:42 -07:00 committed by Greg Kroah-Hartman
parent 2c9127b4cd
commit be3ba37143
1 changed files with 1 additions and 1 deletions
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2
drivers/perf/riscv_pmu_sbi.c
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@ -502,7 +502,7 @@ 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)