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 watchdog_enable_hardlockup_detector(bool val);
  29 extern bool watchdog_hardlockup_detector_is_enabled(void);
  30 #else
  31 static inline void watchdog_enable_hardlockup_detector(bool val)
  32 {
  33 }
  34 static 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
  46 static inline bool trigger_all_cpu_backtrace(void)
  47 {
  48         arch_trigger_all_cpu_backtrace(true);
  49
  50         return true;
  51 }
  52 static inline bool trigger_allbutself_cpu_backtrace(void)
  53 {
  54         arch_trigger_all_cpu_backtrace(false);
  55         return true;
  56 }
  57 #else
  58 static inline bool trigger_all_cpu_backtrace(void)
  59 {
  60         return false;
  61 }
  62 static inline bool trigger_allbutself_cpu_backtrace(void)
  63 {
  64         return false;
  65 }
  66 #endif
  67
  68 #ifdef CONFIG_LOCKUP_DETECTOR
  69 int hw_nmi_is_cpu_stuck(struct pt_regs *);
  70 u64 hw_nmi_get_sample_period(int watchdog_thresh);
  71 extern int watchdog_user_enabled;
  72 extern int watchdog_thresh;
  73 extern int sysctl_softlockup_all_cpu_backtrace;
  74 struct ctl_table;
  75 extern 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