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>
  19 extern void touch_nmi_watchdog(void);
  20 #else
  21 static inline void touch_nmi_watchdog(void)
  22 {
  23         touch_softlockup_watchdog();
  24 }
  25 #endif
  26
  27 #if defined(CONFIG_HARDLOCKUP_DETECTOR)
  28 extern void hardlockup_detector_disable(void);
  29 #else
  30 static 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
  39 static inline bool trigger_all_cpu_backtrace(void)
  40 {
  41         arch_trigger_cpumask_backtrace(cpu_online_mask, false);
  42         return true;
  43 }
  44
  45 static inline bool trigger_allbutself_cpu_backtrace(void)
  46 {
  47         arch_trigger_cpumask_backtrace(cpu_online_mask, true);
  48         return true;
  49 }
  50
  51 static inline bool trigger_cpumask_backtrace(struct cpumask *mask)
  52 {
  53         arch_trigger_cpumask_backtrace(mask, false);
  54         return true;
  55 }
  56
  57 static 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 */
  64 void nmi_trigger_cpumask_backtrace(const cpumask_t *mask,
  65                                    bool exclude_self,
  66                                    void (*raise)(cpumask_t *mask));
  67 bool nmi_cpu_backtrace(struct pt_regs *regs);
  68
  69 #else
  70 static inline bool trigger_all_cpu_backtrace(void)
  71 {
  72         return false;
  73 }
  74 static inline bool trigger_allbutself_cpu_backtrace(void)
  75 {
  76         return false;
  77 }
  78 static inline bool trigger_cpumask_backtrace(struct cpumask *mask)
  79 {
  80         return false;
  81 }
  82 static inline bool trigger_single_cpu_backtrace(int cpu)
  83 {
  84         return false;
  85 }
  86 #endif
  87
  88 #ifdef CONFIG_LOCKUP_DETECTOR
  89 u64 hw_nmi_get_sample_period(int watchdog_thresh);
  90 extern int nmi_watchdog_enabled;
  91 extern int soft_watchdog_enabled;
  92 extern int watchdog_user_enabled;
  93 extern int watchdog_thresh;
  94 extern unsigned long *watchdog_cpumask_bits;
  95 extern int sysctl_softlockup_all_cpu_backtrace;
  96 extern int sysctl_hardlockup_all_cpu_backtrace;
  97 struct ctl_table;
  98 extern int proc_watchdog(struct ctl_table *, int ,
  99                          void __user *, size_t *, loff_t *);
 100 extern int proc_nmi_watchdog(struct ctl_table *, int ,
 101                              void __user *, size_t *, loff_t *);
 102 extern int proc_soft_watchdog(struct ctl_table *, int ,
 103                               void __user *, size_t *, loff_t *);
 104 extern int proc_watchdog_thresh(struct ctl_table *, int ,
 105                                 void __user *, size_t *, loff_t *);
 106 extern int proc_watchdog_cpumask(struct ctl_table *, int,
 107                                  void __user *, size_t *, loff_t *);
 108 extern int lockup_detector_suspend(void);
 109 extern void lockup_detector_resume(void);
 110 #else
 111 static inline int lockup_detector_suspend(void)
 112 {
 113         return 0;
 114 }
 115
 116 static 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