diff options
Diffstat (limited to 'include/linux/nmi.h')
| -rw-r--r-- | include/linux/nmi.h | 217 |
1 files changed, 217 insertions, 0 deletions
diff --git a/include/linux/nmi.h b/include/linux/nmi.h new file mode 100644 index 000000000..0db377ff8 --- /dev/null +++ b/include/linux/nmi.h @@ -0,0 +1,217 @@ +/* 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 |