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- /* 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);
- void lockup_detector_reconfigure(void);
- /**
- * 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_PERF)
- 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
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