include/linux/nmi.h

Source file repositories/reference/linux-study-clean/include/linux/nmi.h

File Facts

System
Linux kernel
Corpus path
include/linux/nmi.h
Extension
.h
Size
7602 bytes
Lines
234
Domain
Core OS
Bucket
Core Kernel Interface
Inferred role
Core OS: implementation source
Status
source implementation candidate

Why This File Exists

Core operating-system implementation surface: boot, tasks, memory, VFS, syscall-facing interfaces, synchronization, credentials, and isolation.

Dependency Surface

Detected Declarations

Annotated Snippet

static inline void lockup_detector_init(void) { }
static inline void lockup_detector_retry_init(void) { }
static inline void lockup_detector_soft_poweroff(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', 'watchdog_hardlockup_user_enabled' and
 * 'watchdog_softlockup_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 WATCHDOG_HARDLOCKUP_ENABLED_BIT  0
#define WATCHDOG_SOFTOCKUP_ENABLED_BIT   1
#define WATCHDOG_HARDLOCKUP_ENABLED     (1 << WATCHDOG_HARDLOCKUP_ENABLED_BIT)
#define WATCHDOG_SOFTOCKUP_ENABLED      (1 << WATCHDOG_SOFTOCKUP_ENABLED_BIT)

#if defined(CONFIG_HARDLOCKUP_DETECTOR)
extern void hardlockup_detector_disable(void);
extern unsigned int hardlockup_panic;
extern unsigned long hardlockup_si_mask;
#else
static inline void hardlockup_detector_disable(void) {}
#endif

/* Sparc64 has special implemetantion that is always enabled. */
#if defined(CONFIG_HARDLOCKUP_DETECTOR) || defined(CONFIG_HARDLOCKUP_DETECTOR_SPARC64)
void arch_touch_nmi_watchdog(void);
#else
static inline void arch_touch_nmi_watchdog(void) { }
#endif

#if defined(CONFIG_HARDLOCKUP_DETECTOR_COUNTS_HRTIMER)
void watchdog_hardlockup_touch_cpu(unsigned int cpu);
void watchdog_hardlockup_check(unsigned int cpu, struct pt_regs *regs);
#endif

#if defined(CONFIG_HARDLOCKUP_DETECTOR_PERF)
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);
void watchdog_hardlockup_start(void);
int watchdog_hardlockup_probe(void);
void watchdog_hardlockup_enable(unsigned int cpu);
void watchdog_hardlockup_disable(unsigned int cpu);

void lockup_detector_reconfigure(void);

#ifdef CONFIG_HARDLOCKUP_DETECTOR_BUDDY
void watchdog_buddy_check_hardlockup(int hrtimer_interrupts);
#else

Annotation

Implementation Notes