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 {
  32 }
  33 #endif
  34
  35 /*
  36  * Create trigger_all_cpu_backtrace() out of the arch-provided
  37  * base function. Return whether such support was available,
  38  * to allow calling code to fall back to some other mechanism:
  39  */
  40 #ifdef arch_trigger_all_cpu_backtrace
  41 static inline bool trigger_all_cpu_backtrace(void)
  42 {
  43         arch_trigger_all_cpu_backtrace(true);
  44
  45         return true;
  46 }
  47 static inline bool trigger_allbutself_cpu_backtrace(void)
  48 {
  49         arch_trigger_all_cpu_backtrace(false);
  50         return true;
  51 }
  52 #else
  53 static inline bool trigger_all_cpu_backtrace(void)
  54 {
  55         return false;
  56 }
  57 static inline bool trigger_allbutself_cpu_backtrace(void)
  58 {
  59         return false;
  60 }
  61 #endif
  62
  63 #ifdef CONFIG_LOCKUP_DETECTOR
  64 int hw_nmi_is_cpu_stuck(struct pt_regs *);
  65 u64 hw_nmi_get_sample_period(int watchdog_thresh);
  66 extern int nmi_watchdog_enabled;
  67 extern int soft_watchdog_enabled;
  68 extern int watchdog_user_enabled;
  69 extern int watchdog_thresh;
  70 extern unsigned long *watchdog_cpumask_bits;
  71 extern int sysctl_softlockup_all_cpu_backtrace;
  72 struct ctl_table;
  73 extern int proc_watchdog(struct ctl_table *, int ,
  74                          void __user *, size_t *, loff_t *);
  75 extern int proc_nmi_watchdog(struct ctl_table *, int ,
  76                              void __user *, size_t *, loff_t *);
  77 extern int proc_soft_watchdog(struct ctl_table *, int ,
  78                               void __user *, size_t *, loff_t *);
  79 extern int proc_watchdog_thresh(struct ctl_table *, int ,
  80                                 void __user *, size_t *, loff_t *);
  81 extern int proc_watchdog_cpumask(struct ctl_table *, int,
  82                                  void __user *, size_t *, loff_t *);
  83 #endif
  84
  85 #ifdef CONFIG_HAVE_ACPI_APEI_NMI
  86 #include <asm/nmi.h>
  87 #endif
  88
  89 #endif