diff options
| author | Yicong Yang <yangyicong@hisilicon.com> | 2025-07-01 14:02:13 +0300 |
|---|---|---|
| committer | Will Deacon <will@kernel.org> | 2025-07-04 15:17:30 +0300 |
| commit | 60bc47b5a0b164082d448815d7db3066266aa3ed (patch) | |
| tree | 49037ceaa09b4317f10ba5a5c5139bd56f07b274 /include/linux | |
| parent | 19272b37aa4f83ca52bdf9c16d5d81bdd1354494 (diff) | |
| download | linux-60bc47b5a0b164082d448815d7db3066266aa3ed.tar.xz | |
watchdog/perf: Provide function for adjusting the event period
Architecture's using perf events for hard lockup detection needs to
convert the watchdog_thresh to the event's period, some architecture
for example arm64 perform this conversion using the CPU's maximum
frequency which will be acquired by cpufreq. However by the time
the lockup detector's initialized the cpufreq driver may not be
initialized, thus launch a watchdog with inaccurate period. Provide
a function hardlockup_detector_perf_adjust_period() to allowing
adjust the event period. Then architecture can update with more
accurate period if cpufreq is initialized.
Reviewed-by: Douglas Anderson <dianders@chromium.org>
Signed-off-by: Yicong Yang <yangyicong@hisilicon.com>
Link: https://lore.kernel.org/r/20250701110214.27242-2-yangyicong@huawei.com
Signed-off-by: Will Deacon <will@kernel.org>
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/nmi.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/nmi.h b/include/linux/nmi.h index e78fa535f61d..cf3c6ab408aa 100644 --- a/include/linux/nmi.h +++ b/include/linux/nmi.h @@ -103,10 +103,12 @@ void watchdog_hardlockup_check(unsigned int cpu, struct pt_regs *regs); extern void hardlockup_detector_perf_stop(void); extern void hardlockup_detector_perf_restart(void); extern void hardlockup_config_perf_event(const char *str); +extern void hardlockup_detector_perf_adjust_period(u64 period); #else static inline void hardlockup_detector_perf_stop(void) { } static inline void hardlockup_detector_perf_restart(void) { } static inline void hardlockup_config_perf_event(const char *str) { } +static inline void hardlockup_detector_perf_adjust_period(u64 period) { } #endif void watchdog_hardlockup_stop(void); |