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 int sysctl_softlockup_all_cpu_backtrace; 71 struct ctl_table; 72 extern int proc_watchdog(struct ctl_table *, int , 73 void __user *, size_t *, loff_t *); 74 extern int proc_nmi_watchdog(struct ctl_table *, int , 75 void __user *, size_t *, loff_t *); 76 extern int proc_soft_watchdog(struct ctl_table *, int , 77 void __user *, size_t *, loff_t *); 78 extern int proc_watchdog_thresh(struct ctl_table *, int , 79 void __user *, size_t *, loff_t *); 80 #endif 81 82 #ifdef CONFIG_HAVE_ACPI_APEI_NMI 83 #include <asm/nmi.h> 84 #endif 85 86 #endif 87