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RISC-V: Update user page mapping only once during start
commit133a6d1fe7
upstream. 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:f5bfa23f57
("RISC-V: Add a perf core library for pmu drivers") Reviewed-by: Anup Patel <anup@brainfault.org> Signed-off-by: Atish Patra <atishp@rivosinc.com> Reviewed-by: Guo Ren <guoren@kernel.org> Cc: stable@vger.kernel.org Link: https://lore.kernel.org/r/20220711174632.4186047-3-atishp@rivosinc.com Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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2 changed files with 1 additions and 1 deletions
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@ -170,7 +170,6 @@ int riscv_pmu_event_set_period(struct perf_event *event)
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left = (max_period >> 1);
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local64_set(&hwc->prev_count, (u64)-left);
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perf_event_update_userpage(event);
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return overflow;
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}
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@ -542,6 +542,7 @@ static inline void pmu_sbi_start_overflow_mask(struct riscv_pmu *pmu,
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sbi_ecall(SBI_EXT_PMU, SBI_EXT_PMU_COUNTER_START, idx, 1,
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flag, init_val, 0, 0);
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#endif
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perf_event_update_userpage(event);
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}
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ctr_ovf_mask = ctr_ovf_mask >> 1;
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idx++;
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