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