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_cpumask_backtrace
  39static inline bool trigger_all_cpu_backtrace(void)
  40{
  41        arch_trigger_cpumask_backtrace(cpu_online_mask, false);
  42        return true;
  43}
  44
  45static inline bool trigger_allbutself_cpu_backtrace(void)
  46{
  47        arch_trigger_cpumask_backtrace(cpu_online_mask, true);
  48        return true;
  49}
  50
  51static inline bool trigger_cpumask_backtrace(struct cpumask *mask)
  52{
  53        arch_trigger_cpumask_backtrace(mask, false);
  54        return true;
  55}
  56
  57static inline bool trigger_single_cpu_backtrace(int cpu)
  58{
  59        arch_trigger_cpumask_backtrace(cpumask_of(cpu), false);
  60        return true;
  61}
  62
  63/* generic implementation */
  64void nmi_trigger_cpumask_backtrace(const cpumask_t *mask,
  65                                   bool exclude_self,
  66                                   void (*raise)(cpumask_t *mask));
  67bool nmi_cpu_backtrace(struct pt_regs *regs);
  68
  69#else
  70static inline bool trigger_all_cpu_backtrace(void)
  71{
  72        return false;
  73}
  74static inline bool trigger_allbutself_cpu_backtrace(void)
  75{
  76        return false;
  77}
  78static inline bool trigger_cpumask_backtrace(struct cpumask *mask)
  79{
  80        return false;
  81}
  82static inline bool trigger_single_cpu_backtrace(int cpu)
  83{
  84        return false;
  85}
  86#endif
  87
  88#ifdef CONFIG_LOCKUP_DETECTOR
  89u64 hw_nmi_get_sample_period(int watchdog_thresh);
  90extern int nmi_watchdog_enabled;
  91extern int soft_watchdog_enabled;
  92extern int watchdog_user_enabled;
  93extern int watchdog_thresh;
  94extern unsigned long *watchdog_cpumask_bits;
  95extern int sysctl_softlockup_all_cpu_backtrace;
  96extern int sysctl_hardlockup_all_cpu_backtrace;
  97struct ctl_table;
  98extern int proc_watchdog(struct ctl_table *, int ,
  99                         void __user *, size_t *, loff_t *);
 100extern int proc_nmi_watchdog(struct ctl_table *, int ,
 101                             void __user *, size_t *, loff_t *);
 102extern int proc_soft_watchdog(struct ctl_table *, int ,
 103                              void __user *, size_t *, loff_t *);
 104extern int proc_watchdog_thresh(struct ctl_table *, int ,
 105                                void __user *, size_t *, loff_t *);
 106extern int proc_watchdog_cpumask(struct ctl_table *, int,
 107                                 void __user *, size_t *, loff_t *);
 108extern int lockup_detector_suspend(void);
 109extern void lockup_detector_resume(void);
 110#else
 111static inline int lockup_detector_suspend(void)
 112{
 113        return 0;
 114}
 115
 116static inline void lockup_detector_resume(void)
 117{
 118}
 119#endif
 120
 121#ifdef CONFIG_HAVE_ACPI_APEI_NMI
 122#include <asm/nmi.h>
 123#endif
 124
 125#endif
 126