xref: /openbmc/linux/include/linux/nmi.h (revision a2cce7a9)
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 #endif
32 
33 /*
34  * Create trigger_all_cpu_backtrace() out of the arch-provided
35  * base function. Return whether such support was available,
36  * to allow calling code to fall back to some other mechanism:
37  */
38 #ifdef arch_trigger_all_cpu_backtrace
39 static inline bool trigger_all_cpu_backtrace(void)
40 {
41 	arch_trigger_all_cpu_backtrace(true);
42 
43 	return true;
44 }
45 static inline bool trigger_allbutself_cpu_backtrace(void)
46 {
47 	arch_trigger_all_cpu_backtrace(false);
48 	return true;
49 }
50 
51 /* generic implementation */
52 void nmi_trigger_all_cpu_backtrace(bool include_self,
53 				   void (*raise)(cpumask_t *mask));
54 bool nmi_cpu_backtrace(struct pt_regs *regs);
55 
56 #else
57 static inline bool trigger_all_cpu_backtrace(void)
58 {
59 	return false;
60 }
61 static inline bool trigger_allbutself_cpu_backtrace(void)
62 {
63 	return false;
64 }
65 #endif
66 
67 #ifdef CONFIG_LOCKUP_DETECTOR
68 int hw_nmi_is_cpu_stuck(struct pt_regs *);
69 u64 hw_nmi_get_sample_period(int watchdog_thresh);
70 extern int nmi_watchdog_enabled;
71 extern int soft_watchdog_enabled;
72 extern int watchdog_user_enabled;
73 extern int watchdog_thresh;
74 extern unsigned long *watchdog_cpumask_bits;
75 extern int sysctl_softlockup_all_cpu_backtrace;
76 struct ctl_table;
77 extern int proc_watchdog(struct ctl_table *, int ,
78 			 void __user *, size_t *, loff_t *);
79 extern int proc_nmi_watchdog(struct ctl_table *, int ,
80 			     void __user *, size_t *, loff_t *);
81 extern int proc_soft_watchdog(struct ctl_table *, int ,
82 			      void __user *, size_t *, loff_t *);
83 extern int proc_watchdog_thresh(struct ctl_table *, int ,
84 				void __user *, size_t *, loff_t *);
85 extern int proc_watchdog_cpumask(struct ctl_table *, int,
86 				 void __user *, size_t *, loff_t *);
87 extern int lockup_detector_suspend(void);
88 extern void lockup_detector_resume(void);
89 #else
90 static inline int lockup_detector_suspend(void)
91 {
92 	return 0;
93 }
94 
95 static inline void lockup_detector_resume(void)
96 {
97 }
98 #endif
99 
100 #ifdef CONFIG_HAVE_ACPI_APEI_NMI
101 #include <asm/nmi.h>
102 #endif
103 
104 #endif
105