Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * linux/include/linux/nmi.h | |
3 | */ | |
4 | #ifndef LINUX_NMI_H | |
5 | #define LINUX_NMI_H | |
6 | ||
9938406a | 7 | #include <linux/sched.h> |
1da177e4 | 8 | #include <asm/irq.h> |
f2e0cff8 NP |
9 | #if defined(CONFIG_HAVE_NMI_WATCHDOG) |
10 | #include <asm/nmi.h> | |
11 | #endif | |
1da177e4 | 12 | |
d151b27d | 13 | #ifdef CONFIG_LOCKUP_DETECTOR |
05a4a952 NP |
14 | void lockup_detector_init(void); |
15 | #else | |
16 | static inline void lockup_detector_init(void) | |
17 | { | |
18 | } | |
19 | #endif | |
20 | ||
21 | #ifdef CONFIG_SOFTLOCKUP_DETECTOR | |
d151b27d IM |
22 | extern void touch_softlockup_watchdog_sched(void); |
23 | extern void touch_softlockup_watchdog(void); | |
24 | extern void touch_softlockup_watchdog_sync(void); | |
25 | extern void touch_all_softlockup_watchdogs(void); | |
d151b27d | 26 | extern unsigned int softlockup_panic; |
05a4a952 NP |
27 | extern int soft_watchdog_enabled; |
28 | extern atomic_t watchdog_park_in_progress; | |
d151b27d IM |
29 | #else |
30 | static inline void touch_softlockup_watchdog_sched(void) | |
31 | { | |
32 | } | |
33 | static inline void touch_softlockup_watchdog(void) | |
34 | { | |
35 | } | |
36 | static inline void touch_softlockup_watchdog_sync(void) | |
37 | { | |
38 | } | |
39 | static inline void touch_all_softlockup_watchdogs(void) | |
40 | { | |
41 | } | |
d151b27d IM |
42 | #endif |
43 | ||
44 | #ifdef CONFIG_DETECT_HUNG_TASK | |
45 | void reset_hung_task_detector(void); | |
46 | #else | |
47 | static inline void reset_hung_task_detector(void) | |
48 | { | |
49 | } | |
50 | #endif | |
51 | ||
249e52e3 BM |
52 | /* |
53 | * The run state of the lockup detectors is controlled by the content of the | |
54 | * 'watchdog_enabled' variable. Each lockup detector has its dedicated bit - | |
55 | * bit 0 for the hard lockup detector and bit 1 for the soft lockup detector. | |
56 | * | |
57 | * 'watchdog_user_enabled', 'nmi_watchdog_enabled' and 'soft_watchdog_enabled' | |
58 | * are variables that are only used as an 'interface' between the parameters | |
59 | * in /proc/sys/kernel and the internal state bits in 'watchdog_enabled'. The | |
60 | * 'watchdog_thresh' variable is handled differently because its value is not | |
61 | * boolean, and the lockup detectors are 'suspended' while 'watchdog_thresh' | |
62 | * is equal zero. | |
63 | */ | |
64 | #define NMI_WATCHDOG_ENABLED_BIT 0 | |
65 | #define SOFT_WATCHDOG_ENABLED_BIT 1 | |
66 | #define NMI_WATCHDOG_ENABLED (1 << NMI_WATCHDOG_ENABLED_BIT) | |
67 | #define SOFT_WATCHDOG_ENABLED (1 << SOFT_WATCHDOG_ENABLED_BIT) | |
68 | ||
f2e0cff8 NP |
69 | #if defined(CONFIG_HARDLOCKUP_DETECTOR) |
70 | extern void hardlockup_detector_disable(void); | |
05a4a952 | 71 | extern unsigned int hardlockup_panic; |
f2e0cff8 NP |
72 | #else |
73 | static inline void hardlockup_detector_disable(void) {} | |
74 | #endif | |
75 | ||
05a4a952 | 76 | #if defined(CONFIG_HARDLOCKUP_DETECTOR_PERF) |
f2e0cff8 NP |
77 | extern void arch_touch_nmi_watchdog(void); |
78 | #else | |
05a4a952 | 79 | #if !defined(CONFIG_HAVE_NMI_WATCHDOG) |
f2e0cff8 NP |
80 | static inline void arch_touch_nmi_watchdog(void) {} |
81 | #endif | |
05a4a952 | 82 | #endif |
f2e0cff8 | 83 | |
1da177e4 LT |
84 | /** |
85 | * touch_nmi_watchdog - restart NMI watchdog timeout. | |
86 | * | |
87 | * If the architecture supports the NMI watchdog, touch_nmi_watchdog() | |
88 | * may be used to reset the timeout - for code which intentionally | |
89 | * disables interrupts for a long time. This call is stateless. | |
90 | */ | |
5d0e600d IM |
91 | static inline void touch_nmi_watchdog(void) |
92 | { | |
f2e0cff8 | 93 | arch_touch_nmi_watchdog(); |
5d0e600d IM |
94 | touch_softlockup_watchdog(); |
95 | } | |
6e7458a6 | 96 | |
47cab6a7 IM |
97 | /* |
98 | * Create trigger_all_cpu_backtrace() out of the arch-provided | |
99 | * base function. Return whether such support was available, | |
100 | * to allow calling code to fall back to some other mechanism: | |
101 | */ | |
9a01c3ed | 102 | #ifdef arch_trigger_cpumask_backtrace |
47cab6a7 IM |
103 | static inline bool trigger_all_cpu_backtrace(void) |
104 | { | |
9a01c3ed | 105 | arch_trigger_cpumask_backtrace(cpu_online_mask, false); |
47cab6a7 IM |
106 | return true; |
107 | } | |
9a01c3ed | 108 | |
f3aca3d0 AT |
109 | static inline bool trigger_allbutself_cpu_backtrace(void) |
110 | { | |
9a01c3ed CM |
111 | arch_trigger_cpumask_backtrace(cpu_online_mask, true); |
112 | return true; | |
113 | } | |
114 | ||
115 | static inline bool trigger_cpumask_backtrace(struct cpumask *mask) | |
116 | { | |
117 | arch_trigger_cpumask_backtrace(mask, false); | |
118 | return true; | |
119 | } | |
120 | ||
121 | static inline bool trigger_single_cpu_backtrace(int cpu) | |
122 | { | |
123 | arch_trigger_cpumask_backtrace(cpumask_of(cpu), false); | |
f3aca3d0 AT |
124 | return true; |
125 | } | |
b2c0b2cb RK |
126 | |
127 | /* generic implementation */ | |
9a01c3ed CM |
128 | void nmi_trigger_cpumask_backtrace(const cpumask_t *mask, |
129 | bool exclude_self, | |
b2c0b2cb RK |
130 | void (*raise)(cpumask_t *mask)); |
131 | bool nmi_cpu_backtrace(struct pt_regs *regs); | |
132 | ||
47cab6a7 IM |
133 | #else |
134 | static inline bool trigger_all_cpu_backtrace(void) | |
135 | { | |
136 | return false; | |
137 | } | |
f3aca3d0 AT |
138 | static inline bool trigger_allbutself_cpu_backtrace(void) |
139 | { | |
140 | return false; | |
141 | } | |
9a01c3ed CM |
142 | static inline bool trigger_cpumask_backtrace(struct cpumask *mask) |
143 | { | |
144 | return false; | |
145 | } | |
146 | static inline bool trigger_single_cpu_backtrace(int cpu) | |
147 | { | |
148 | return false; | |
149 | } | |
bb81a09e AM |
150 | #endif |
151 | ||
05a4a952 | 152 | #ifdef CONFIG_HARDLOCKUP_DETECTOR_PERF |
4eec42f3 | 153 | u64 hw_nmi_get_sample_period(int watchdog_thresh); |
05a4a952 NP |
154 | #endif |
155 | ||
156 | #ifdef CONFIG_LOCKUP_DETECTOR | |
84d56e66 | 157 | extern int nmi_watchdog_enabled; |
3c00ea82 | 158 | extern int watchdog_user_enabled; |
586692a5 | 159 | extern int watchdog_thresh; |
249e52e3 | 160 | extern unsigned long watchdog_enabled; |
05a4a952 | 161 | extern struct cpumask watchdog_cpumask; |
fe4ba3c3 | 162 | extern unsigned long *watchdog_cpumask_bits; |
05a4a952 | 163 | extern int __read_mostly watchdog_suspended; |
249e52e3 | 164 | #ifdef CONFIG_SMP |
ed235875 | 165 | extern int sysctl_softlockup_all_cpu_backtrace; |
55537871 | 166 | extern int sysctl_hardlockup_all_cpu_backtrace; |
249e52e3 BM |
167 | #else |
168 | #define sysctl_softlockup_all_cpu_backtrace 0 | |
169 | #define sysctl_hardlockup_all_cpu_backtrace 0 | |
170 | #endif | |
171 | extern bool is_hardlockup(void); | |
504d7cf1 | 172 | struct ctl_table; |
83a80a39 UO |
173 | extern int proc_watchdog(struct ctl_table *, int , |
174 | void __user *, size_t *, loff_t *); | |
175 | extern int proc_nmi_watchdog(struct ctl_table *, int , | |
176 | void __user *, size_t *, loff_t *); | |
177 | extern int proc_soft_watchdog(struct ctl_table *, int , | |
178 | void __user *, size_t *, loff_t *); | |
179 | extern int proc_watchdog_thresh(struct ctl_table *, int , | |
180 | void __user *, size_t *, loff_t *); | |
fe4ba3c3 CM |
181 | extern int proc_watchdog_cpumask(struct ctl_table *, int, |
182 | void __user *, size_t *, loff_t *); | |
ec6a9066 UO |
183 | extern int lockup_detector_suspend(void); |
184 | extern void lockup_detector_resume(void); | |
999bbe49 | 185 | #else |
ec6a9066 | 186 | static inline int lockup_detector_suspend(void) |
999bbe49 UO |
187 | { |
188 | return 0; | |
189 | } | |
190 | ||
ec6a9066 | 191 | static inline void lockup_detector_resume(void) |
999bbe49 UO |
192 | { |
193 | } | |
84e478c6 DZ |
194 | #endif |
195 | ||
44a69f61 TN |
196 | #ifdef CONFIG_HAVE_ACPI_APEI_NMI |
197 | #include <asm/nmi.h> | |
198 | #endif | |
199 | ||
1da177e4 | 200 | #endif |