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>
19extern void touch_nmi_watchdog(void);
20#else
21static inline void touch_nmi_watchdog(void)
22{
23	touch_softlockup_watchdog();
24}
25#endif
26
27#if defined(CONFIG_HARDLOCKUP_DETECTOR)
28extern void hardlockup_detector_disable(void);
29#else
30static 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
41static inline bool trigger_all_cpu_backtrace(void)
42{
43	arch_trigger_all_cpu_backtrace(true);
44
45	return true;
46}
47static inline bool trigger_allbutself_cpu_backtrace(void)
48{
49	arch_trigger_all_cpu_backtrace(false);
50	return true;
51}
52#else
53static inline bool trigger_all_cpu_backtrace(void)
54{
55	return false;
56}
57static inline bool trigger_allbutself_cpu_backtrace(void)
58{
59	return false;
60}
61#endif
62
63#ifdef CONFIG_LOCKUP_DETECTOR
64int hw_nmi_is_cpu_stuck(struct pt_regs *);
65u64 hw_nmi_get_sample_period(int watchdog_thresh);
66extern int nmi_watchdog_enabled;
67extern int soft_watchdog_enabled;
68extern int watchdog_user_enabled;
69extern int watchdog_thresh;
70extern int sysctl_softlockup_all_cpu_backtrace;
71struct ctl_table;
72extern int proc_watchdog(struct ctl_table *, int ,
73			 void __user *, size_t *, loff_t *);
74extern int proc_nmi_watchdog(struct ctl_table *, int ,
75			     void __user *, size_t *, loff_t *);
76extern int proc_soft_watchdog(struct ctl_table *, int ,
77			      void __user *, size_t *, loff_t *);
78extern 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