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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * linux/include/linux/nmi.h
3 */
4#ifndef LINUX_NMI_H
5#define LINUX_NMI_H
6
Michal Schmidt99384062006-09-29 01:59:03 -07007#include <linux/sched.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -07008#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 */
Cong Wangd314d742012-03-23 15:01:51 -070017#if defined(CONFIG_HAVE_NMI_WATCHDOG) || defined(CONFIG_HARDLOCKUP_DETECTOR)
Andrew Mortonbb81a092006-12-07 02:14:01 +010018#include <asm/nmi.h>
Don Zickus96a84c22010-11-29 17:07:16 -050019extern void touch_nmi_watchdog(void);
20#else
Ingo Molnar5d0e6002007-02-13 13:26:24 +010021static inline void touch_nmi_watchdog(void)
22{
23 touch_softlockup_watchdog();
24}
Don Zickus96a84c22010-11-29 17:07:16 -050025#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -070026
Ulrich Obergfell6e7458a2014-10-13 15:55:35 -070027#if defined(CONFIG_HARDLOCKUP_DETECTOR)
28extern void watchdog_enable_hardlockup_detector(bool val);
29extern bool watchdog_hardlockup_detector_is_enabled(void);
30#else
31static inline void watchdog_enable_hardlockup_detector(bool val)
32{
33}
34static inline bool watchdog_hardlockup_detector_is_enabled(void)
35{
36 return true;
37}
38#endif
39
Ingo Molnar47cab6a2009-08-03 09:31:54 +020040/*
41 * Create trigger_all_cpu_backtrace() out of the arch-provided
42 * base function. Return whether such support was available,
43 * to allow calling code to fall back to some other mechanism:
44 */
45#ifdef arch_trigger_all_cpu_backtrace
46static inline bool trigger_all_cpu_backtrace(void)
47{
Aaron Tomlinf3aca3d2014-06-23 13:22:05 -070048 arch_trigger_all_cpu_backtrace(true);
Ingo Molnar47cab6a2009-08-03 09:31:54 +020049
50 return true;
51}
Aaron Tomlinf3aca3d2014-06-23 13:22:05 -070052static inline bool trigger_allbutself_cpu_backtrace(void)
53{
54 arch_trigger_all_cpu_backtrace(false);
55 return true;
56}
Ingo Molnar47cab6a2009-08-03 09:31:54 +020057#else
58static inline bool trigger_all_cpu_backtrace(void)
59{
60 return false;
61}
Aaron Tomlinf3aca3d2014-06-23 13:22:05 -070062static inline bool trigger_allbutself_cpu_backtrace(void)
63{
64 return false;
65}
Andrew Mortonbb81a092006-12-07 02:14:01 +010066#endif
67
Don Zickus58687ac2010-05-07 17:11:44 -040068#ifdef CONFIG_LOCKUP_DETECTOR
Don Zickus84e478c2010-02-05 21:47:05 -050069int hw_nmi_is_cpu_stuck(struct pt_regs *);
Mandeep Singh Baines4eec42f2011-05-22 22:10:23 -070070u64 hw_nmi_get_sample_period(int watchdog_thresh);
Frederic Weisbecker3c00ea82013-05-19 20:45:15 +020071extern int watchdog_user_enabled;
Mandeep Singh Baines586692a2011-05-22 22:10:22 -070072extern int watchdog_thresh;
Aaron Tomlined235872014-06-23 13:22:05 -070073extern int sysctl_softlockup_all_cpu_backtrace;
Don Zickus504d7cf2010-02-12 17:19:19 -050074struct ctl_table;
Mandeep Singh Baines586692a2011-05-22 22:10:22 -070075extern int proc_dowatchdog(struct ctl_table *, int ,
76 void __user *, size_t *, loff_t *);
Don Zickus84e478c2010-02-05 21:47:05 -050077#endif
78
Tomasz Nowicki44a69f62014-07-22 11:20:12 +020079#ifdef CONFIG_HAVE_ACPI_APEI_NMI
80#include <asm/nmi.h>
81#endif
82
Linus Torvalds1da177e2005-04-16 15:20:36 -070083#endif