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 #ifdef ARCH_HAS_NMI_WATCHDOG
  18 #include <asm/nmi.h>
  19 extern void touch_nmi_watchdog(void);
  20 extern void acpi_nmi_disable(void);
  21 extern void acpi_nmi_enable(void);
  22 #else
  23 #ifndef CONFIG_NMI_WATCHDOG
  24 static inline void touch_nmi_watchdog(void)
  25 {
  26         touch_softlockup_watchdog();
  27 }
  28 #else
  29 extern void touch_nmi_watchdog(void);
  30 #endif
  31 static inline void acpi_nmi_disable(void) { }
  32 static inline void acpi_nmi_enable(void) { }
  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();
  44
  45         return true;
  46 }
  47 #else
  48 static inline bool trigger_all_cpu_backtrace(void)
  49 {
  50         return false;
  51 }
  52 #endif
  53
  54 #ifdef CONFIG_NMI_WATCHDOG
  55 int hw_nmi_is_cpu_stuck(struct pt_regs *);
  56 u64 hw_nmi_get_sample_period(void);
  57 extern int nmi_watchdog_enabled;
  58 struct ctl_table;
  59 extern int proc_nmi_enabled(struct ctl_table *, int ,
  60                         void __user *, size_t *, loff_t *);
  61 #endif
  62
  63 #endif