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_all_cpu_backtrace
  39 static inline bool trigger_all_cpu_backtrace(void)
  40 {
  41         arch_trigger_all_cpu_backtrace(true);
  42
  43         return true;
  44 }
  45 static inline bool trigger_allbutself_cpu_backtrace(void)
  46 {
  47         arch_trigger_all_cpu_backtrace(false);
  48         return true;
  49 }
  50
  51 /* generic implementation */
  52 void nmi_trigger_all_cpu_backtrace(bool include_self,
  53                                    void (*raise)(cpumask_t *mask));
  54 bool nmi_cpu_backtrace(struct pt_regs *regs);
  55
  56 #else
  57 static inline bool trigger_all_cpu_backtrace(void)
  58 {
  59         return false;
  60 }
  61 static inline bool trigger_allbutself_cpu_backtrace(void)
  62 {
  63         return false;
  64 }
  65 #endif
  66
  67 #ifdef CONFIG_LOCKUP_DETECTOR
  68 int hw_nmi_is_cpu_stuck(struct pt_regs *);
  69 u64 hw_nmi_get_sample_period(int watchdog_thresh);
  70 extern int nmi_watchdog_enabled;
  71 extern int soft_watchdog_enabled;
  72 extern int watchdog_user_enabled;
  73 extern int watchdog_thresh;
  74 extern unsigned long *watchdog_cpumask_bits;
  75 extern int sysctl_softlockup_all_cpu_backtrace;
  76 extern int sysctl_hardlockup_all_cpu_backtrace;
  77 struct ctl_table;
  78 extern int proc_watchdog(struct ctl_table *, int ,
  79                          void __user *, size_t *, loff_t *);
  80 extern int proc_nmi_watchdog(struct ctl_table *, int ,
  81                              void __user *, size_t *, loff_t *);
  82 extern int proc_soft_watchdog(struct ctl_table *, int ,
  83                               void __user *, size_t *, loff_t *);
  84 extern int proc_watchdog_thresh(struct ctl_table *, int ,
  85                                 void __user *, size_t *, loff_t *);
  86 extern int proc_watchdog_cpumask(struct ctl_table *, int,
  87                                  void __user *, size_t *, loff_t *);
  88 extern int lockup_detector_suspend(void);
  89 extern void lockup_detector_resume(void);
  90 #else
  91 static inline int lockup_detector_suspend(void)
  92 {
  93         return 0;
  94 }
  95
  96 static inline void lockup_detector_resume(void)
  97 {
  98 }
  99 #endif
 100
 101 #ifdef CONFIG_HAVE_ACPI_APEI_NMI
 102 #include <asm/nmi.h>
 103 #endif
 104
 105 #endif