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 hardlockup_detector_disable(void);
  29#else
  30static inline void hardlockup_detector_disable(void) {}
  31#endif
  32
  33/*
  34 * Create trigger_all_cpu_backtrace() out of the arch-provided
  35 * base function. Return whether such support was available,
  36 * to allow calling code to fall back to some other mechanism:
  37 */
  38#ifdef arch_trigger_all_cpu_backtrace
  39static inline bool trigger_all_cpu_backtrace(void)
  40{
  41        arch_trigger_all_cpu_backtrace(true);
  42
  43        return true;
  44}
  45static inline bool trigger_allbutself_cpu_backtrace(void)
  46{
  47        arch_trigger_all_cpu_backtrace(false);
  48        return true;
  49}
  50
  51/* generic implementation */
  52void nmi_trigger_all_cpu_backtrace(bool include_self,
  53                                   void (*raise)(cpumask_t *mask));
  54bool nmi_cpu_backtrace(struct pt_regs *regs);
  55
  56#else
  57static inline bool trigger_all_cpu_backtrace(void)
  58{
  59        return false;
  60}
  61static inline bool trigger_allbutself_cpu_backtrace(void)
  62{
  63        return false;
  64}
  65#endif
  66
  67#ifdef CONFIG_LOCKUP_DETECTOR
  68u64 hw_nmi_get_sample_period(int watchdog_thresh);
  69extern int nmi_watchdog_enabled;
  70extern int soft_watchdog_enabled;
  71extern int watchdog_user_enabled;
  72extern int watchdog_thresh;
  73extern unsigned long *watchdog_cpumask_bits;
  74extern int sysctl_softlockup_all_cpu_backtrace;
  75extern int sysctl_hardlockup_all_cpu_backtrace;
  76struct ctl_table;
  77extern int proc_watchdog(struct ctl_table *, int ,
  78                         void __user *, size_t *, loff_t *);
  79extern int proc_nmi_watchdog(struct ctl_table *, int ,
  80                             void __user *, size_t *, loff_t *);
  81extern int proc_soft_watchdog(struct ctl_table *, int ,
  82                              void __user *, size_t *, loff_t *);
  83extern int proc_watchdog_thresh(struct ctl_table *, int ,
  84                                void __user *, size_t *, loff_t *);
  85extern int proc_watchdog_cpumask(struct ctl_table *, int,
  86                                 void __user *, size_t *, loff_t *);
  87extern int lockup_detector_suspend(void);
  88extern void lockup_detector_resume(void);
  89#else
  90static inline int lockup_detector_suspend(void)
  91{
  92        return 0;
  93}
  94
  95static inline void lockup_detector_resume(void)
  96{
  97}
  98#endif
  99
 100#ifdef CONFIG_HAVE_ACPI_APEI_NMI
 101#include <asm/nmi.h>
 102#endif
 103
 104#endif
 105