xref: /openbmc/linux/include/linux/nmi.h (revision d7a3d85e)
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