| /* SPDX-License-Identifier: GPL-2.0 */ |
| /* |
| * linux/include/linux/nmi.h |
| */ |
| #ifndef LINUX_NMI_H |
| #define LINUX_NMI_H |
| |
| #include <linux/sched.h> |
| #include <asm/irq.h> |
| #if defined(CONFIG_HAVE_NMI_WATCHDOG) |
| #include <asm/nmi.h> |
| #endif |
| |
| #ifdef CONFIG_LOCKUP_DETECTOR |
| void lockup_detector_init(void); |
| void lockup_detector_soft_poweroff(void); |
| void lockup_detector_cleanup(void); |
| bool is_hardlockup(void); |
| |
| extern int watchdog_user_enabled; |
| extern int nmi_watchdog_user_enabled; |
| extern int soft_watchdog_user_enabled; |
| extern int watchdog_thresh; |
| extern unsigned long watchdog_enabled; |
| |
| extern struct cpumask watchdog_cpumask; |
| extern unsigned long *watchdog_cpumask_bits; |
| #ifdef CONFIG_SMP |
| extern int sysctl_softlockup_all_cpu_backtrace; |
| extern int sysctl_hardlockup_all_cpu_backtrace; |
| #else |
| #define sysctl_softlockup_all_cpu_backtrace 0 |
| #define sysctl_hardlockup_all_cpu_backtrace 0 |
| #endif /* !CONFIG_SMP */ |
| |
| #else /* CONFIG_LOCKUP_DETECTOR */ |
| static inline void lockup_detector_init(void) { } |
| static inline void lockup_detector_soft_poweroff(void) { } |
| static inline void lockup_detector_cleanup(void) { } |
| #endif /* !CONFIG_LOCKUP_DETECTOR */ |
| |
| #ifdef CONFIG_SOFTLOCKUP_DETECTOR |
| extern void touch_softlockup_watchdog_sched(void); |
| extern void touch_softlockup_watchdog(void); |
| extern void touch_softlockup_watchdog_sync(void); |
| extern void touch_all_softlockup_watchdogs(void); |
| extern unsigned int softlockup_panic; |
| |
| extern int lockup_detector_online_cpu(unsigned int cpu); |
| extern int lockup_detector_offline_cpu(unsigned int cpu); |
| #else /* CONFIG_SOFTLOCKUP_DETECTOR */ |
| static inline void touch_softlockup_watchdog_sched(void) { } |
| static inline void touch_softlockup_watchdog(void) { } |
| static inline void touch_softlockup_watchdog_sync(void) { } |
| static inline void touch_all_softlockup_watchdogs(void) { } |
| |
| #define lockup_detector_online_cpu NULL |
| #define lockup_detector_offline_cpu NULL |
| #endif /* CONFIG_SOFTLOCKUP_DETECTOR */ |
| |
| #ifdef CONFIG_DETECT_HUNG_TASK |
| void reset_hung_task_detector(void); |
| #else |
| static inline void reset_hung_task_detector(void) { } |
| #endif |
| |
| /* |
| * The run state of the lockup detectors is controlled by the content of the |
| * 'watchdog_enabled' variable. Each lockup detector has its dedicated bit - |
| * bit 0 for the hard lockup detector and bit 1 for the soft lockup detector. |
| * |
| * 'watchdog_user_enabled', 'nmi_watchdog_user_enabled' and |
| * 'soft_watchdog_user_enabled' are variables that are only used as an |
| * 'interface' between the parameters in /proc/sys/kernel and the internal |
| * state bits in 'watchdog_enabled'. The 'watchdog_thresh' variable is |
| * handled differently because its value is not boolean, and the lockup |
| * detectors are 'suspended' while 'watchdog_thresh' is equal zero. |
| */ |
| #define NMI_WATCHDOG_ENABLED_BIT 0 |
| #define SOFT_WATCHDOG_ENABLED_BIT 1 |
| #define NMI_WATCHDOG_ENABLED (1 << NMI_WATCHDOG_ENABLED_BIT) |
| #define SOFT_WATCHDOG_ENABLED (1 << SOFT_WATCHDOG_ENABLED_BIT) |
| |
| #if defined(CONFIG_HARDLOCKUP_DETECTOR) |
| extern void hardlockup_detector_disable(void); |
| extern unsigned int hardlockup_panic; |
| #else |
| static inline void hardlockup_detector_disable(void) {} |
| #endif |
| |
| #if defined(CONFIG_HAVE_NMI_WATCHDOG) || defined(CONFIG_HARDLOCKUP_DETECTOR) |
| # define NMI_WATCHDOG_SYSCTL_PERM 0644 |
| #else |
| # define NMI_WATCHDOG_SYSCTL_PERM 0444 |
| #endif |
| |
| #if defined(CONFIG_HARDLOCKUP_DETECTOR_PERF) |
| extern void arch_touch_nmi_watchdog(void); |
| extern void hardlockup_detector_perf_stop(void); |
| extern void hardlockup_detector_perf_restart(void); |
| extern void hardlockup_detector_perf_disable(void); |
| extern void hardlockup_detector_perf_enable(void); |
| extern void hardlockup_detector_perf_cleanup(void); |
| extern int hardlockup_detector_perf_init(void); |
| #else |
| static inline void hardlockup_detector_perf_stop(void) { } |
| static inline void hardlockup_detector_perf_restart(void) { } |
| static inline void hardlockup_detector_perf_disable(void) { } |
| static inline void hardlockup_detector_perf_enable(void) { } |
| static inline void hardlockup_detector_perf_cleanup(void) { } |
| # if !defined(CONFIG_HAVE_NMI_WATCHDOG) |
| static inline int hardlockup_detector_perf_init(void) { return -ENODEV; } |
| static inline void arch_touch_nmi_watchdog(void) {} |
| # else |
| static inline int hardlockup_detector_perf_init(void) { return 0; } |
| # endif |
| #endif |
| |
| void watchdog_nmi_stop(void); |
| void watchdog_nmi_start(void); |
| int watchdog_nmi_probe(void); |
| int watchdog_nmi_enable(unsigned int cpu); |
| void watchdog_nmi_disable(unsigned int cpu); |
| |
| /** |
| * touch_nmi_watchdog - restart NMI watchdog timeout. |
| * |
| * If the architecture supports the NMI watchdog, touch_nmi_watchdog() |
| * may be used to reset the timeout - for code which intentionally |
| * disables interrupts for a long time. This call is stateless. |
| */ |
| static inline void touch_nmi_watchdog(void) |
| { |
| arch_touch_nmi_watchdog(); |
| touch_softlockup_watchdog(); |
| } |
| |
| /* |
| * Create trigger_all_cpu_backtrace() out of the arch-provided |
| * base function. Return whether such support was available, |
| * to allow calling code to fall back to some other mechanism: |
| */ |
| #ifdef arch_trigger_cpumask_backtrace |
| static inline bool trigger_all_cpu_backtrace(void) |
| { |
| arch_trigger_cpumask_backtrace(cpu_online_mask, false); |
| return true; |
| } |
| |
| static inline bool trigger_allbutself_cpu_backtrace(void) |
| { |
| arch_trigger_cpumask_backtrace(cpu_online_mask, true); |
| return true; |
| } |
| |
| static inline bool trigger_cpumask_backtrace(struct cpumask *mask) |
| { |
| arch_trigger_cpumask_backtrace(mask, false); |
| return true; |
| } |
| |
| static inline bool trigger_single_cpu_backtrace(int cpu) |
| { |
| arch_trigger_cpumask_backtrace(cpumask_of(cpu), false); |
| return true; |
| } |
| |
| /* generic implementation */ |
| void nmi_trigger_cpumask_backtrace(const cpumask_t *mask, |
| bool exclude_self, |
| void (*raise)(cpumask_t *mask)); |
| bool nmi_cpu_backtrace(struct pt_regs *regs); |
| |
| #else |
| static inline bool trigger_all_cpu_backtrace(void) |
| { |
| return false; |
| } |
| static inline bool trigger_allbutself_cpu_backtrace(void) |
| { |
| return false; |
| } |
| static inline bool trigger_cpumask_backtrace(struct cpumask *mask) |
| { |
| return false; |
| } |
| static inline bool trigger_single_cpu_backtrace(int cpu) |
| { |
| return false; |
| } |
| #endif |
| |
| #ifdef CONFIG_HARDLOCKUP_DETECTOR_PERF |
| u64 hw_nmi_get_sample_period(int watchdog_thresh); |
| #endif |
| |
| #if defined(CONFIG_HARDLOCKUP_CHECK_TIMESTAMP) && \ |
| defined(CONFIG_HARDLOCKUP_DETECTOR) |
| void watchdog_update_hrtimer_threshold(u64 period); |
| #else |
| static inline void watchdog_update_hrtimer_threshold(u64 period) { } |
| #endif |
| |
| struct ctl_table; |
| int proc_watchdog(struct ctl_table *, int, void *, size_t *, loff_t *); |
| int proc_nmi_watchdog(struct ctl_table *, int , void *, size_t *, loff_t *); |
| int proc_soft_watchdog(struct ctl_table *, int , void *, size_t *, loff_t *); |
| int proc_watchdog_thresh(struct ctl_table *, int , void *, size_t *, loff_t *); |
| int proc_watchdog_cpumask(struct ctl_table *, int, void *, size_t *, loff_t *); |
| |
| #ifdef CONFIG_HAVE_ACPI_APEI_NMI |
| #include <asm/nmi.h> |
| #endif |
| |
| #endif |