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 84