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(ARCH_HAS_NMI_WATCHDOG) || defined(CONFIG_HARDLOCKUP_DETECTOR)
  18 #include <asm/nmi.h>
  19 extern void touch_nmi_watchdog(void);
  20 #else
  21 #ifdef CONFIG_XEN
  22 #include <asm/nmi.h>
  23 #endif
  24 static inline void touch_nmi_watchdog(void)
  25 {
  26         touch_softlockup_watchdog();
  27 }
  28 #endif
  29
  30 /*
  31  * Create trigger_all_cpu_backtrace() out of the arch-provided
  32  * base function. Return whether such support was available,
  33  * to allow calling code to fall back to some other mechanism:
  34  */
  35 #ifdef arch_trigger_all_cpu_backtrace
  36 static inline bool trigger_all_cpu_backtrace(void)
  37 {
  38         arch_trigger_all_cpu_backtrace();
  39
  40         return true;
  41 }
  42 #else
  43 static inline bool trigger_all_cpu_backtrace(void)
  44 {
  45         return false;
  46 }
  47 #endif
  48
  49 #ifdef CONFIG_LOCKUP_DETECTOR
  50 int hw_nmi_is_cpu_stuck(struct pt_regs *);
  51 u64 hw_nmi_get_sample_period(int watchdog_thresh);
  52 extern int watchdog_enabled;
  53 extern int watchdog_thresh;
  54 struct ctl_table;
  55 extern int proc_dowatchdog(struct ctl_table *, int ,
  56                            void __user *, size_t *, loff_t *);
  57 #endif
  58
  59 #endif