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/*
28 * Create trigger_all_cpu_backtrace() out of the arch-provided
29 * base function. Return whether such support was available,
30 * to allow calling code to fall back to some other mechanism:
31 */
32#ifdef arch_trigger_all_cpu_backtrace
33static inline bool trigger_all_cpu_backtrace(void)
34{
35	arch_trigger_all_cpu_backtrace();
 
 
36
 
 
 
37	return true;
38}
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
39#else
40static inline bool trigger_all_cpu_backtrace(void)
41{
42	return false;
43}
 
 
 
 
 
 
 
 
 
 
 
 
44#endif
45
46#ifdef CONFIG_LOCKUP_DETECTOR
47int hw_nmi_is_cpu_stuck(struct pt_regs *);
48u64 hw_nmi_get_sample_period(int watchdog_thresh);
49extern int watchdog_user_enabled;
50extern int watchdog_thresh;
 
 
 
 
 
 
 
51struct ctl_table;
52extern int proc_dowatchdog(struct ctl_table *, int ,
53			   void __user *, size_t *, loff_t *);
 
 
 
 
 
 
 
 
 
 
 
54#endif
55
56#endif

  1/* SPDX-License-Identifier: GPL-2.0 */
  2/*
  3 *  linux/include/linux/nmi.h
  4 */
  5#ifndef LINUX_NMI_H
  6#define LINUX_NMI_H
  7
  8#include <linux/sched.h>
  9#include <asm/irq.h>
 10#if defined(CONFIG_HAVE_NMI_WATCHDOG)
 11#include <asm/nmi.h>
 12#endif
 13
 14#ifdef CONFIG_LOCKUP_DETECTOR
 15void lockup_detector_init(void);
 16void lockup_detector_soft_poweroff(void);
 17void lockup_detector_cleanup(void);
 18bool is_hardlockup(void);
 19
 20extern int watchdog_user_enabled;
 21extern int nmi_watchdog_user_enabled;
 22extern int soft_watchdog_user_enabled;
 23extern int watchdog_thresh;
 24extern unsigned long watchdog_enabled;
 25
 26extern struct cpumask watchdog_cpumask;
 27extern unsigned long *watchdog_cpumask_bits;
 28#ifdef CONFIG_SMP
 29extern int sysctl_softlockup_all_cpu_backtrace;
 30extern int sysctl_hardlockup_all_cpu_backtrace;
 31#else
 32#define sysctl_softlockup_all_cpu_backtrace 0
 33#define sysctl_hardlockup_all_cpu_backtrace 0
 34#endif /* !CONFIG_SMP */
 35
 36#else /* CONFIG_LOCKUP_DETECTOR */
 37static inline void lockup_detector_init(void) { }
 38static inline void lockup_detector_soft_poweroff(void) { }
 39static inline void lockup_detector_cleanup(void) { }
 40#endif /* !CONFIG_LOCKUP_DETECTOR */
 41
 42#ifdef CONFIG_SOFTLOCKUP_DETECTOR
 43extern void touch_softlockup_watchdog_sched(void);
 44extern void touch_softlockup_watchdog(void);
 45extern void touch_softlockup_watchdog_sync(void);
 46extern void touch_all_softlockup_watchdogs(void);
 47extern unsigned int  softlockup_panic;
 48#else
 49static inline void touch_softlockup_watchdog_sched(void) { }
 50static inline void touch_softlockup_watchdog(void) { }
 51static inline void touch_softlockup_watchdog_sync(void) { }
 52static inline void touch_all_softlockup_watchdogs(void) { }
 53#endif
 54
 55#ifdef CONFIG_DETECT_HUNG_TASK
 56void reset_hung_task_detector(void);
 57#else
 58static inline void reset_hung_task_detector(void) { }
 59#endif
 60
 61/*
 62 * The run state of the lockup detectors is controlled by the content of the
 63 * 'watchdog_enabled' variable. Each lockup detector has its dedicated bit -
 64 * bit 0 for the hard lockup detector and bit 1 for the soft lockup detector.
 65 *
 66 * 'watchdog_user_enabled', 'nmi_watchdog_user_enabled' and
 67 * 'soft_watchdog_user_enabled' are variables that are only used as an
 68 * 'interface' between the parameters in /proc/sys/kernel and the internal
 69 * state bits in 'watchdog_enabled'. The 'watchdog_thresh' variable is
 70 * handled differently because its value is not boolean, and the lockup
 71 * detectors are 'suspended' while 'watchdog_thresh' is equal zero.
 72 */
 73#define NMI_WATCHDOG_ENABLED_BIT   0
 74#define SOFT_WATCHDOG_ENABLED_BIT  1
 75#define NMI_WATCHDOG_ENABLED      (1 << NMI_WATCHDOG_ENABLED_BIT)
 76#define SOFT_WATCHDOG_ENABLED     (1 << SOFT_WATCHDOG_ENABLED_BIT)
 77
 78#if defined(CONFIG_HARDLOCKUP_DETECTOR)
 79extern void hardlockup_detector_disable(void);
 80extern unsigned int hardlockup_panic;
 81#else
 82static inline void hardlockup_detector_disable(void) {}
 83#endif
 84
 85#if defined(CONFIG_HAVE_NMI_WATCHDOG) || defined(CONFIG_HARDLOCKUP_DETECTOR)
 86# define NMI_WATCHDOG_SYSCTL_PERM	0644
 87#else
 88# define NMI_WATCHDOG_SYSCTL_PERM	0444
 89#endif
 90
 91#if defined(CONFIG_HARDLOCKUP_DETECTOR_PERF)
 92extern void arch_touch_nmi_watchdog(void);
 93extern void hardlockup_detector_perf_stop(void);
 94extern void hardlockup_detector_perf_restart(void);
 95extern void hardlockup_detector_perf_disable(void);
 96extern void hardlockup_detector_perf_enable(void);
 97extern void hardlockup_detector_perf_cleanup(void);
 98extern int hardlockup_detector_perf_init(void);
 99#else
100static inline void hardlockup_detector_perf_stop(void) { }
101static inline void hardlockup_detector_perf_restart(void) { }
102static inline void hardlockup_detector_perf_disable(void) { }
103static inline void hardlockup_detector_perf_enable(void) { }
104static inline void hardlockup_detector_perf_cleanup(void) { }
105# if !defined(CONFIG_HAVE_NMI_WATCHDOG)
106static inline int hardlockup_detector_perf_init(void) { return -ENODEV; }
107static inline void arch_touch_nmi_watchdog(void) {}
108# else
109static inline int hardlockup_detector_perf_init(void) { return 0; }
110# endif
111#endif
112
113void watchdog_nmi_stop(void);
114void watchdog_nmi_start(void);
115int watchdog_nmi_probe(void);
116
117/**
118 * touch_nmi_watchdog - restart NMI watchdog timeout.
119 *
120 * If the architecture supports the NMI watchdog, touch_nmi_watchdog()
121 * may be used to reset the timeout - for code which intentionally
122 * disables interrupts for a long time. This call is stateless.
123 */
 
 
 
 
124static inline void touch_nmi_watchdog(void)
125{
126	arch_touch_nmi_watchdog();
127	touch_softlockup_watchdog();
128}
 
129
130/*
131 * Create trigger_all_cpu_backtrace() out of the arch-provided
132 * base function. Return whether such support was available,
133 * to allow calling code to fall back to some other mechanism:
134 */
135#ifdef arch_trigger_cpumask_backtrace
136static inline bool trigger_all_cpu_backtrace(void)
137{
138	arch_trigger_cpumask_backtrace(cpu_online_mask, false);
139	return true;
140}
141
142static inline bool trigger_allbutself_cpu_backtrace(void)
143{
144	arch_trigger_cpumask_backtrace(cpu_online_mask, true);
145	return true;
146}
147
148static inline bool trigger_cpumask_backtrace(struct cpumask *mask)
149{
150	arch_trigger_cpumask_backtrace(mask, false);
151	return true;
152}
153
154static inline bool trigger_single_cpu_backtrace(int cpu)
155{
156	arch_trigger_cpumask_backtrace(cpumask_of(cpu), false);
157	return true;
158}
159
160/* generic implementation */
161void nmi_trigger_cpumask_backtrace(const cpumask_t *mask,
162				   bool exclude_self,
163				   void (*raise)(cpumask_t *mask));
164bool nmi_cpu_backtrace(struct pt_regs *regs);
165
166#else
167static inline bool trigger_all_cpu_backtrace(void)
168{
169	return false;
170}
171static inline bool trigger_allbutself_cpu_backtrace(void)
172{
173	return false;
174}
175static inline bool trigger_cpumask_backtrace(struct cpumask *mask)
176{
177	return false;
178}
179static inline bool trigger_single_cpu_backtrace(int cpu)
180{
181	return false;
182}
183#endif
184
185#ifdef CONFIG_HARDLOCKUP_DETECTOR_PERF
 
186u64 hw_nmi_get_sample_period(int watchdog_thresh);
187#endif
188
189#if defined(CONFIG_HARDLOCKUP_CHECK_TIMESTAMP) && \
190    defined(CONFIG_HARDLOCKUP_DETECTOR)
191void watchdog_update_hrtimer_threshold(u64 period);
192#else
193static inline void watchdog_update_hrtimer_threshold(u64 period) { }
194#endif
195
196struct ctl_table;
197extern int proc_watchdog(struct ctl_table *, int ,
198			 void __user *, size_t *, loff_t *);
199extern int proc_nmi_watchdog(struct ctl_table *, int ,
200			     void __user *, size_t *, loff_t *);
201extern int proc_soft_watchdog(struct ctl_table *, int ,
202			      void __user *, size_t *, loff_t *);
203extern int proc_watchdog_thresh(struct ctl_table *, int ,
204				void __user *, size_t *, loff_t *);
205extern int proc_watchdog_cpumask(struct ctl_table *, int,
206				 void __user *, size_t *, loff_t *);
207
208#ifdef CONFIG_HAVE_ACPI_APEI_NMI
209#include <asm/nmi.h>
210#endif
211
212#endif