Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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linux
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#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
39static inline bool trigger_all_cpu_backtrace(void)
40{
41 arch_trigger_all_cpu_backtrace(true);
42
43 return true;
44}
45static inline bool trigger_allbutself_cpu_backtrace(void)
46{
47 arch_trigger_all_cpu_backtrace(false);
48 return true;
49}
50
51/* generic implementation */
52void nmi_trigger_all_cpu_backtrace(bool include_self,
53 void (*raise)(cpumask_t *mask));
54bool nmi_cpu_backtrace(struct pt_regs *regs);
55
56#else
57static inline bool trigger_all_cpu_backtrace(void)
58{
59 return false;
60}
61static inline bool trigger_allbutself_cpu_backtrace(void)
62{
63 return false;
64}
65#endif
66
67#ifdef CONFIG_LOCKUP_DETECTOR
68int hw_nmi_is_cpu_stuck(struct pt_regs *);
69u64 hw_nmi_get_sample_period(int watchdog_thresh);
70extern int nmi_watchdog_enabled;
71extern int soft_watchdog_enabled;
72extern int watchdog_user_enabled;
73extern int watchdog_thresh;
74extern unsigned long *watchdog_cpumask_bits;
75extern int sysctl_softlockup_all_cpu_backtrace;
76struct ctl_table;
77extern int proc_watchdog(struct ctl_table *, int ,
78 void __user *, size_t *, loff_t *);
79extern int proc_nmi_watchdog(struct ctl_table *, int ,
80 void __user *, size_t *, loff_t *);
81extern int proc_soft_watchdog(struct ctl_table *, int ,
82 void __user *, size_t *, loff_t *);
83extern int proc_watchdog_thresh(struct ctl_table *, int ,
84 void __user *, size_t *, loff_t *);
85extern int proc_watchdog_cpumask(struct ctl_table *, int,
86 void __user *, size_t *, loff_t *);
87extern int lockup_detector_suspend(void);
88extern void lockup_detector_resume(void);
89#else
90static inline int lockup_detector_suspend(void)
91{
92 return 0;
93}
94
95static 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