LXR linux/include/linux/nmi.h

   1/*
   2 *  linux/include/linux/nmi.h
   3 */
   4#ifndef LINUX_NMI_H
   5#define LINUX_NMI_H
   6
   7#include <linux/sched.h>
   8#include <asm/irq.h>
   9
  10/**
  11 * touch_nmi_watchdog - restart NMI watchdog timeout.
  12 * 
  13 * If the architecture supports the NMI watchdog, touch_nmi_watchdog()
  14 * may be used to reset the timeout - for code which intentionally
  15 * disables interrupts for a long time. This call is stateless.
  16 */
  17#if defined(CONFIG_HAVE_NMI_WATCHDOG) || defined(CONFIG_HARDLOCKUP_DETECTOR)
  18#include <asm/nmi.h>
  19extern void touch_nmi_watchdog(void);
  20#else
  21static inline void touch_nmi_watchdog(void)
  22{
  23        touch_softlockup_watchdog();
  24}
  25#endif
  26
  27#if defined(CONFIG_HARDLOCKUP_DETECTOR)
  28extern void watchdog_enable_hardlockup_detector(bool val);
  29extern bool watchdog_hardlockup_detector_is_enabled(void);
  30#else
  31static inline void watchdog_enable_hardlockup_detector(bool val)
  32{
  33}
  34static inline bool watchdog_hardlockup_detector_is_enabled(void)
  35{
  36        return true;
  37}
  38#endif
  39
  40/*
  41 * Create trigger_all_cpu_backtrace() out of the arch-provided
  42 * base function. Return whether such support was available,
  43 * to allow calling code to fall back to some other mechanism:
  44 */
  45#ifdef arch_trigger_all_cpu_backtrace
  46static inline bool trigger_all_cpu_backtrace(void)
  47{
  48        arch_trigger_all_cpu_backtrace(true);
  49
  50        return true;
  51}
  52static inline bool trigger_allbutself_cpu_backtrace(void)
  53{
  54        arch_trigger_all_cpu_backtrace(false);
  55        return true;
  56}
  57#else
  58static inline bool trigger_all_cpu_backtrace(void)
  59{
  60        return false;
  61}
  62static inline bool trigger_allbutself_cpu_backtrace(void)
  63{
  64        return false;
  65}
  66#endif
  67
  68#ifdef CONFIG_LOCKUP_DETECTOR
  69int hw_nmi_is_cpu_stuck(struct pt_regs *);
  70u64 hw_nmi_get_sample_period(int watchdog_thresh);
  71extern int watchdog_user_enabled;
  72extern int watchdog_thresh;
  73extern int sysctl_softlockup_all_cpu_backtrace;
  74struct ctl_table;
  75extern int proc_dowatchdog(struct ctl_table *, int ,
  76                           void __user *, size_t *, loff_t *);
  77#endif
  78
  79#ifdef CONFIG_HAVE_ACPI_APEI_NMI
  80#include <asm/nmi.h>
  81#endif
  82
  83#endif
  84