2 * linux/include/linux/nmi.h
7 #include <linux/sched.h>
9 #if defined(CONFIG_HAVE_NMI_WATCHDOG)
13 #ifdef CONFIG_LOCKUP_DETECTOR
14 void lockup_detector_init(void);
15 void lockup_detector_soft_poweroff(void);
16 void lockup_detector_cleanup(void);
17 bool is_hardlockup(void);
19 extern int watchdog_user_enabled
;
20 extern int nmi_watchdog_user_enabled
;
21 extern int soft_watchdog_user_enabled
;
22 extern int watchdog_thresh
;
23 extern unsigned long watchdog_enabled
;
25 extern struct cpumask watchdog_cpumask
;
26 extern unsigned long *watchdog_cpumask_bits
;
28 extern int sysctl_softlockup_all_cpu_backtrace
;
29 extern int sysctl_hardlockup_all_cpu_backtrace
;
31 #define sysctl_softlockup_all_cpu_backtrace 0
32 #define sysctl_hardlockup_all_cpu_backtrace 0
33 #endif /* !CONFIG_SMP */
35 #else /* CONFIG_LOCKUP_DETECTOR */
36 static inline void lockup_detector_init(void) { }
37 static inline void lockup_detector_soft_poweroff(void) { }
38 static inline void lockup_detector_cleanup(void) { }
39 #endif /* !CONFIG_LOCKUP_DETECTOR */
41 #ifdef CONFIG_SOFTLOCKUP_DETECTOR
42 extern void touch_softlockup_watchdog_sched(void);
43 extern void touch_softlockup_watchdog(void);
44 extern void touch_softlockup_watchdog_sync(void);
45 extern void touch_all_softlockup_watchdogs(void);
46 extern unsigned int softlockup_panic
;
48 static inline void touch_softlockup_watchdog_sched(void) { }
49 static inline void touch_softlockup_watchdog(void) { }
50 static inline void touch_softlockup_watchdog_sync(void) { }
51 static inline void touch_all_softlockup_watchdogs(void) { }
54 #ifdef CONFIG_DETECT_HUNG_TASK
55 void reset_hung_task_detector(void);
57 static inline void reset_hung_task_detector(void) { }
61 * The run state of the lockup detectors is controlled by the content of the
62 * 'watchdog_enabled' variable. Each lockup detector has its dedicated bit -
63 * bit 0 for the hard lockup detector and bit 1 for the soft lockup detector.
65 * 'watchdog_user_enabled', 'nmi_watchdog_user_enabled' and
66 * 'soft_watchdog_user_enabled' are variables that are only used as an
67 * 'interface' between the parameters in /proc/sys/kernel and the internal
68 * state bits in 'watchdog_enabled'. The 'watchdog_thresh' variable is
69 * handled differently because its value is not boolean, and the lockup
70 * detectors are 'suspended' while 'watchdog_thresh' is equal zero.
72 #define NMI_WATCHDOG_ENABLED_BIT 0
73 #define SOFT_WATCHDOG_ENABLED_BIT 1
74 #define NMI_WATCHDOG_ENABLED (1 << NMI_WATCHDOG_ENABLED_BIT)
75 #define SOFT_WATCHDOG_ENABLED (1 << SOFT_WATCHDOG_ENABLED_BIT)
77 #if defined(CONFIG_HARDLOCKUP_DETECTOR)
78 extern void hardlockup_detector_disable(void);
79 extern unsigned int hardlockup_panic
;
81 static inline void hardlockup_detector_disable(void) {}
84 #if defined(CONFIG_HAVE_NMI_WATCHDOG) || defined(CONFIG_HARDLOCKUP_DETECTOR)
85 # define NMI_WATCHDOG_SYSCTL_PERM 0644
87 # define NMI_WATCHDOG_SYSCTL_PERM 0444
90 #if defined(CONFIG_HARDLOCKUP_DETECTOR_PERF)
91 extern void arch_touch_nmi_watchdog(void);
92 extern void hardlockup_detector_perf_stop(void);
93 extern void hardlockup_detector_perf_restart(void);
94 extern void hardlockup_detector_perf_disable(void);
95 extern void hardlockup_detector_perf_enable(void);
96 extern void hardlockup_detector_perf_cleanup(void);
97 extern int hardlockup_detector_perf_init(void);
99 static inline void hardlockup_detector_perf_stop(void) { }
100 static inline void hardlockup_detector_perf_restart(void) { }
101 static inline void hardlockup_detector_perf_disable(void) { }
102 static inline void hardlockup_detector_perf_enable(void) { }
103 static inline void hardlockup_detector_perf_cleanup(void) { }
104 # if !defined(CONFIG_HAVE_NMI_WATCHDOG)
105 static inline int hardlockup_detector_perf_init(void) { return -ENODEV
; }
106 static inline void arch_touch_nmi_watchdog(void) {}
108 static inline int hardlockup_detector_perf_init(void) { return 0; }
112 void watchdog_nmi_stop(void);
113 void watchdog_nmi_start(void);
114 int watchdog_nmi_probe(void);
117 * touch_nmi_watchdog - restart NMI watchdog timeout.
119 * If the architecture supports the NMI watchdog, touch_nmi_watchdog()
120 * may be used to reset the timeout - for code which intentionally
121 * disables interrupts for a long time. This call is stateless.
123 static inline void touch_nmi_watchdog(void)
125 arch_touch_nmi_watchdog();
126 touch_softlockup_watchdog();
130 * Create trigger_all_cpu_backtrace() out of the arch-provided
131 * base function. Return whether such support was available,
132 * to allow calling code to fall back to some other mechanism:
134 #ifdef arch_trigger_cpumask_backtrace
135 static inline bool trigger_all_cpu_backtrace(void)
137 arch_trigger_cpumask_backtrace(cpu_online_mask
, false);
141 static inline bool trigger_allbutself_cpu_backtrace(void)
143 arch_trigger_cpumask_backtrace(cpu_online_mask
, true);
147 static inline bool trigger_cpumask_backtrace(struct cpumask
*mask
)
149 arch_trigger_cpumask_backtrace(mask
, false);
153 static inline bool trigger_single_cpu_backtrace(int cpu
)
155 arch_trigger_cpumask_backtrace(cpumask_of(cpu
), false);
159 /* generic implementation */
160 void nmi_trigger_cpumask_backtrace(const cpumask_t
*mask
,
162 void (*raise
)(cpumask_t
*mask
));
163 bool nmi_cpu_backtrace(struct pt_regs
*regs
);
166 static inline bool trigger_all_cpu_backtrace(void)
170 static inline bool trigger_allbutself_cpu_backtrace(void)
174 static inline bool trigger_cpumask_backtrace(struct cpumask
*mask
)
178 static inline bool trigger_single_cpu_backtrace(int cpu
)
184 #ifdef CONFIG_HARDLOCKUP_DETECTOR_PERF
185 u64
hw_nmi_get_sample_period(int watchdog_thresh
);
188 #if defined(CONFIG_HARDLOCKUP_CHECK_TIMESTAMP) && \
189 defined(CONFIG_HARDLOCKUP_DETECTOR)
190 void watchdog_update_hrtimer_threshold(u64 period
);
192 static inline void watchdog_update_hrtimer_threshold(u64 period
) { }
196 extern int proc_watchdog(struct ctl_table
*, int ,
197 void __user
*, size_t *, loff_t
*);
198 extern int proc_nmi_watchdog(struct ctl_table
*, int ,
199 void __user
*, size_t *, loff_t
*);
200 extern int proc_soft_watchdog(struct ctl_table
*, int ,
201 void __user
*, size_t *, loff_t
*);
202 extern int proc_watchdog_thresh(struct ctl_table
*, int ,
203 void __user
*, size_t *, loff_t
*);
204 extern int proc_watchdog_cpumask(struct ctl_table
*, int,
205 void __user
*, size_t *, loff_t
*);
207 #ifdef CONFIG_HAVE_ACPI_APEI_NMI