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 /*
  28  * Create trigger_all_cpu_backtrace() out of the arch-provided
  29  * base function. Return whether such support was available,
  30  * to allow calling code to fall back to some other mechanism:
  31  */
  32 #ifdef arch_trigger_all_cpu_backtrace
  33 static inline bool trigger_all_cpu_backtrace(void)
  34 {
  35         arch_trigger_all_cpu_backtrace(true);
  36
  37         return true;
  38 }
  39 static inline bool trigger_allbutself_cpu_backtrace(void)
  40 {
  41         arch_trigger_all_cpu_backtrace(false);
  42         return true;
  43 }
  44 #else
  45 static inline bool trigger_all_cpu_backtrace(void)
  46 {
  47         return false;
  48 }
  49 static inline bool trigger_allbutself_cpu_backtrace(void)
  50 {
  51         return false;
  52 }
  53 #endif
  54
  55 #ifdef CONFIG_LOCKUP_DETECTOR
  56 int hw_nmi_is_cpu_stuck(struct pt_regs *);
  57 u64 hw_nmi_get_sample_period(int watchdog_thresh);
  58 extern int watchdog_user_enabled;
  59 extern int watchdog_thresh;
  60 extern int sysctl_softlockup_all_cpu_backtrace;
  61 struct ctl_table;
  62 extern int proc_dowatchdog(struct ctl_table *, int ,
  63                            void __user *, size_t *, loff_t *);
  64 #endif
  65
  66 #ifdef CONFIG_HAVE_ACPI_APEI_NMI
  67 #include <asm/nmi.h>
  68 #endif
  69
  70 #endif