diff options
| author | Eric Lin <eric.lin@sifive.com> | 2022-07-05 17:19:20 +0800 |
|---|---|---|
| committer | Will Deacon <will@kernel.org> | 2022-07-06 10:57:30 +0100 |
| commit | e9a023f2b73ac35ff5cfbefe8524c64d8173d65f (patch) | |
| tree | d32964f14942b5e6390e7af2e8dbe5caeca27b92 /drivers/perf/riscv_pmu.c | |
| parent | e500405dd15d956790859fa532c64d8186445372 (diff) | |
drivers/perf: riscv_pmu: Add riscv pmu pm notifier
Currently, when the CPU is doing suspend to ram, we don't
save pmu counter register and its content will be lost.
To ensure perf profiling is not affected by suspend to ram,
this patch is based on arm_pmu CPU_PM notifier and implements riscv
pmu pm notifier. In the pm notifier, we stop the counter and update
the counter value before suspend and start the counter after resume.
Signed-off-by: Eric Lin <eric.lin@sifive.com>
Link: https://lore.kernel.org/r/20220705091920.27432-1-eric.lin@sifive.com
Signed-off-by: Will Deacon <will@kernel.org>
Diffstat (limited to 'drivers/perf/riscv_pmu.c')
| -rw-r--r-- | drivers/perf/riscv_pmu.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/perf/riscv_pmu.c b/drivers/perf/riscv_pmu.c index b2b8d2074ed0..2c961839903d 100644 --- a/drivers/perf/riscv_pmu.c +++ b/drivers/perf/riscv_pmu.c @@ -121,7 +121,7 @@ u64 riscv_pmu_event_update(struct perf_event *event) return delta; } -static void riscv_pmu_stop(struct perf_event *event, int flags) +void riscv_pmu_stop(struct perf_event *event, int flags) { struct hw_perf_event *hwc = &event->hw; struct riscv_pmu *rvpmu = to_riscv_pmu(event->pmu); @@ -175,7 +175,7 @@ int riscv_pmu_event_set_period(struct perf_event *event) return overflow; } -static void riscv_pmu_start(struct perf_event *event, int flags) +void riscv_pmu_start(struct perf_event *event, int flags) { struct hw_perf_event *hwc = &event->hw; struct riscv_pmu *rvpmu = to_riscv_pmu(event->pmu); |