1 /* SPDX-License-Identifier: GPL-2.0 */ 1 /* SPDX-License-Identifier: GPL-2.0 */
2 /* 2 /*
3 * linux/include/linux/nmi.h 3 * linux/include/linux/nmi.h
4 */ 4 */
5 #ifndef LINUX_NMI_H 5 #ifndef LINUX_NMI_H
6 #define LINUX_NMI_H 6 #define LINUX_NMI_H
7 7
8 #include <linux/sched.h> 8 #include <linux/sched.h>
9 #include <asm/irq.h> 9 #include <asm/irq.h>
10 !! 10 #if defined(CONFIG_HAVE_NMI_WATCHDOG)
11 /* Arch specific watchdogs might need to share <<
12 #if defined(CONFIG_HARDLOCKUP_DETECTOR_ARCH) | <<
13 #include <asm/nmi.h> 11 #include <asm/nmi.h>
14 #endif 12 #endif
15 13
16 #ifdef CONFIG_LOCKUP_DETECTOR 14 #ifdef CONFIG_LOCKUP_DETECTOR
17 void lockup_detector_init(void); 15 void lockup_detector_init(void);
18 void lockup_detector_retry_init(void); <<
19 void lockup_detector_soft_poweroff(void); 16 void lockup_detector_soft_poweroff(void);
20 void lockup_detector_cleanup(void); 17 void lockup_detector_cleanup(void);
>> 18 bool is_hardlockup(void);
21 19
22 extern int watchdog_user_enabled; 20 extern int watchdog_user_enabled;
>> 21 extern int nmi_watchdog_user_enabled;
>> 22 extern int soft_watchdog_user_enabled;
23 extern int watchdog_thresh; 23 extern int watchdog_thresh;
24 extern unsigned long watchdog_enabled; 24 extern unsigned long watchdog_enabled;
25 25
26 extern struct cpumask watchdog_cpumask; 26 extern struct cpumask watchdog_cpumask;
27 extern unsigned long *watchdog_cpumask_bits; 27 extern unsigned long *watchdog_cpumask_bits;
28 #ifdef CONFIG_SMP 28 #ifdef CONFIG_SMP
29 extern int sysctl_softlockup_all_cpu_backtrace 29 extern int sysctl_softlockup_all_cpu_backtrace;
30 extern int sysctl_hardlockup_all_cpu_backtrace 30 extern int sysctl_hardlockup_all_cpu_backtrace;
31 #else 31 #else
32 #define sysctl_softlockup_all_cpu_backtrace 0 32 #define sysctl_softlockup_all_cpu_backtrace 0
33 #define sysctl_hardlockup_all_cpu_backtrace 0 33 #define sysctl_hardlockup_all_cpu_backtrace 0
34 #endif /* !CONFIG_SMP */ 34 #endif /* !CONFIG_SMP */
35 35
36 #else /* CONFIG_LOCKUP_DETECTOR */ 36 #else /* CONFIG_LOCKUP_DETECTOR */
37 static inline void lockup_detector_init(void) 37 static inline void lockup_detector_init(void) { }
38 static inline void lockup_detector_retry_init( <<
39 static inline void lockup_detector_soft_powero 38 static inline void lockup_detector_soft_poweroff(void) { }
40 static inline void lockup_detector_cleanup(voi 39 static inline void lockup_detector_cleanup(void) { }
41 #endif /* !CONFIG_LOCKUP_DETECTOR */ 40 #endif /* !CONFIG_LOCKUP_DETECTOR */
42 41
43 #ifdef CONFIG_SOFTLOCKUP_DETECTOR 42 #ifdef CONFIG_SOFTLOCKUP_DETECTOR
44 extern void touch_softlockup_watchdog_sched(vo 43 extern void touch_softlockup_watchdog_sched(void);
45 extern void touch_softlockup_watchdog(void); 44 extern void touch_softlockup_watchdog(void);
46 extern void touch_softlockup_watchdog_sync(voi 45 extern void touch_softlockup_watchdog_sync(void);
47 extern void touch_all_softlockup_watchdogs(voi 46 extern void touch_all_softlockup_watchdogs(void);
48 extern unsigned int softlockup_panic; 47 extern unsigned int softlockup_panic;
49 48
50 extern int lockup_detector_online_cpu(unsigned 49 extern int lockup_detector_online_cpu(unsigned int cpu);
51 extern int lockup_detector_offline_cpu(unsigne 50 extern int lockup_detector_offline_cpu(unsigned int cpu);
52 #else /* CONFIG_SOFTLOCKUP_DETECTOR */ 51 #else /* CONFIG_SOFTLOCKUP_DETECTOR */
53 static inline void touch_softlockup_watchdog_s 52 static inline void touch_softlockup_watchdog_sched(void) { }
54 static inline void touch_softlockup_watchdog(v 53 static inline void touch_softlockup_watchdog(void) { }
55 static inline void touch_softlockup_watchdog_s 54 static inline void touch_softlockup_watchdog_sync(void) { }
56 static inline void touch_all_softlockup_watchd 55 static inline void touch_all_softlockup_watchdogs(void) { }
57 56
58 #define lockup_detector_online_cpu NULL 57 #define lockup_detector_online_cpu NULL
59 #define lockup_detector_offline_cpu NULL 58 #define lockup_detector_offline_cpu NULL
60 #endif /* CONFIG_SOFTLOCKUP_DETECTOR */ 59 #endif /* CONFIG_SOFTLOCKUP_DETECTOR */
61 60
62 #ifdef CONFIG_DETECT_HUNG_TASK 61 #ifdef CONFIG_DETECT_HUNG_TASK
63 void reset_hung_task_detector(void); 62 void reset_hung_task_detector(void);
64 #else 63 #else
65 static inline void reset_hung_task_detector(vo 64 static inline void reset_hung_task_detector(void) { }
66 #endif 65 #endif
67 66
68 /* 67 /*
69 * The run state of the lockup detectors is co 68 * The run state of the lockup detectors is controlled by the content of the
70 * 'watchdog_enabled' variable. Each lockup de 69 * 'watchdog_enabled' variable. Each lockup detector has its dedicated bit -
71 * bit 0 for the hard lockup detector and bit 70 * bit 0 for the hard lockup detector and bit 1 for the soft lockup detector.
72 * 71 *
73 * 'watchdog_user_enabled', 'watchdog_hardlock !! 72 * 'watchdog_user_enabled', 'nmi_watchdog_user_enabled' and
74 * 'watchdog_softlockup_user_enabled' are vari !! 73 * 'soft_watchdog_user_enabled' are variables that are only used as an
75 * 'interface' between the parameters in /proc 74 * 'interface' between the parameters in /proc/sys/kernel and the internal
76 * state bits in 'watchdog_enabled'. The 'watc 75 * state bits in 'watchdog_enabled'. The 'watchdog_thresh' variable is
77 * handled differently because its value is no 76 * handled differently because its value is not boolean, and the lockup
78 * detectors are 'suspended' while 'watchdog_t 77 * detectors are 'suspended' while 'watchdog_thresh' is equal zero.
79 */ 78 */
80 #define WATCHDOG_HARDLOCKUP_ENABLED_BIT 0 !! 79 #define NMI_WATCHDOG_ENABLED_BIT 0
81 #define WATCHDOG_SOFTOCKUP_ENABLED_BIT 1 !! 80 #define SOFT_WATCHDOG_ENABLED_BIT 1
82 #define WATCHDOG_HARDLOCKUP_ENABLED (1 << !! 81 #define NMI_WATCHDOG_ENABLED (1 << NMI_WATCHDOG_ENABLED_BIT)
83 #define WATCHDOG_SOFTOCKUP_ENABLED (1 << !! 82 #define SOFT_WATCHDOG_ENABLED (1 << SOFT_WATCHDOG_ENABLED_BIT)
84 83
85 #if defined(CONFIG_HARDLOCKUP_DETECTOR) 84 #if defined(CONFIG_HARDLOCKUP_DETECTOR)
86 extern void hardlockup_detector_disable(void); 85 extern void hardlockup_detector_disable(void);
87 extern unsigned int hardlockup_panic; 86 extern unsigned int hardlockup_panic;
88 #else 87 #else
89 static inline void hardlockup_detector_disable 88 static inline void hardlockup_detector_disable(void) {}
90 #endif 89 #endif
91 90
92 /* Sparc64 has special implemetantion that is !! 91 #if defined(CONFIG_HAVE_NMI_WATCHDOG) || defined(CONFIG_HARDLOCKUP_DETECTOR)
93 #if defined(CONFIG_HARDLOCKUP_DETECTOR) || def !! 92 # define NMI_WATCHDOG_SYSCTL_PERM 0644
94 void arch_touch_nmi_watchdog(void); <<
95 #else 93 #else
96 static inline void arch_touch_nmi_watchdog(voi !! 94 # define NMI_WATCHDOG_SYSCTL_PERM 0444
97 #endif <<
98 <<
99 #if defined(CONFIG_HARDLOCKUP_DETECTOR_COUNTS_ <<
100 void watchdog_hardlockup_touch_cpu(unsigned in <<
101 void watchdog_hardlockup_check(unsigned int cp <<
102 #endif 95 #endif
103 96
104 #if defined(CONFIG_HARDLOCKUP_DETECTOR_PERF) 97 #if defined(CONFIG_HARDLOCKUP_DETECTOR_PERF)
>> 98 extern void arch_touch_nmi_watchdog(void);
105 extern void hardlockup_detector_perf_stop(void 99 extern void hardlockup_detector_perf_stop(void);
106 extern void hardlockup_detector_perf_restart(v 100 extern void hardlockup_detector_perf_restart(void);
>> 101 extern void hardlockup_detector_perf_disable(void);
>> 102 extern void hardlockup_detector_perf_enable(void);
107 extern void hardlockup_detector_perf_cleanup(v 103 extern void hardlockup_detector_perf_cleanup(void);
108 extern void hardlockup_config_perf_event(const !! 104 extern int hardlockup_detector_perf_init(void);
109 #else 105 #else
110 static inline void hardlockup_detector_perf_st 106 static inline void hardlockup_detector_perf_stop(void) { }
111 static inline void hardlockup_detector_perf_re 107 static inline void hardlockup_detector_perf_restart(void) { }
>> 108 static inline void hardlockup_detector_perf_disable(void) { }
>> 109 static inline void hardlockup_detector_perf_enable(void) { }
112 static inline void hardlockup_detector_perf_cl 110 static inline void hardlockup_detector_perf_cleanup(void) { }
113 static inline void hardlockup_config_perf_even !! 111 # if !defined(CONFIG_HAVE_NMI_WATCHDOG)
>> 112 static inline int hardlockup_detector_perf_init(void) { return -ENODEV; }
>> 113 static inline void arch_touch_nmi_watchdog(void) {}
>> 114 # else
>> 115 static inline int hardlockup_detector_perf_init(void) { return 0; }
>> 116 # endif
114 #endif 117 #endif
115 118
116 void watchdog_hardlockup_stop(void); !! 119 void watchdog_nmi_stop(void);
117 void watchdog_hardlockup_start(void); !! 120 void watchdog_nmi_start(void);
118 int watchdog_hardlockup_probe(void); !! 121 int watchdog_nmi_probe(void);
119 void watchdog_hardlockup_enable(unsigned int c !! 122 int watchdog_nmi_enable(unsigned int cpu);
120 void watchdog_hardlockup_disable(unsigned int !! 123 void watchdog_nmi_disable(unsigned int cpu);
121 124
122 void lockup_detector_reconfigure(void); 125 void lockup_detector_reconfigure(void);
123 126
124 #ifdef CONFIG_HARDLOCKUP_DETECTOR_BUDDY <<
125 void watchdog_buddy_check_hardlockup(int hrtim <<
126 #else <<
127 static inline void watchdog_buddy_check_hardlo <<
128 #endif <<
129 <<
130 /** 127 /**
131 * touch_nmi_watchdog - manually reset the har !! 128 * touch_nmi_watchdog - restart NMI watchdog timeout.
132 * 129 *
133 * If we support detecting hardlockups, touch_ !! 130 * If the architecture supports the NMI watchdog, touch_nmi_watchdog()
134 * used to pet the watchdog (reset the timeout !! 131 * may be used to reset the timeout - for code which intentionally
135 * intentionally disables interrupts for a lon !! 132 * disables interrupts for a long time. This call is stateless.
136 * <<
137 * Though this function has "nmi" in the name, <<
138 * not be backed by NMIs. This function will l <<
139 * touch_hardlockup_watchdog() in the future. <<
140 */ 133 */
141 static inline void touch_nmi_watchdog(void) 134 static inline void touch_nmi_watchdog(void)
142 { 135 {
143 /* <<
144 * Pass on to the hardlockup detector <<
145 * the hardlockup detector may not be <<
146 * and the arch_touch_nmi_watchdog() f <<
147 * in the future. <<
148 */ <<
149 arch_touch_nmi_watchdog(); 136 arch_touch_nmi_watchdog();
150 <<
151 touch_softlockup_watchdog(); 137 touch_softlockup_watchdog();
152 } 138 }
153 139
154 /* 140 /*
155 * Create trigger_all_cpu_backtrace() out of t 141 * Create trigger_all_cpu_backtrace() out of the arch-provided
156 * base function. Return whether such support 142 * base function. Return whether such support was available,
157 * to allow calling code to fall back to some 143 * to allow calling code to fall back to some other mechanism:
158 */ 144 */
159 #ifdef arch_trigger_cpumask_backtrace 145 #ifdef arch_trigger_cpumask_backtrace
160 static inline bool trigger_all_cpu_backtrace(v 146 static inline bool trigger_all_cpu_backtrace(void)
161 { 147 {
162 arch_trigger_cpumask_backtrace(cpu_onl !! 148 arch_trigger_cpumask_backtrace(cpu_online_mask, false);
163 return true; 149 return true;
164 } 150 }
165 151
166 static inline bool trigger_allbutcpu_cpu_backt !! 152 static inline bool trigger_allbutself_cpu_backtrace(void)
167 { 153 {
168 arch_trigger_cpumask_backtrace(cpu_onl !! 154 arch_trigger_cpumask_backtrace(cpu_online_mask, true);
169 return true; 155 return true;
170 } 156 }
171 157
172 static inline bool trigger_cpumask_backtrace(s 158 static inline bool trigger_cpumask_backtrace(struct cpumask *mask)
173 { 159 {
174 arch_trigger_cpumask_backtrace(mask, - !! 160 arch_trigger_cpumask_backtrace(mask, false);
175 return true; 161 return true;
176 } 162 }
177 163
178 static inline bool trigger_single_cpu_backtrac 164 static inline bool trigger_single_cpu_backtrace(int cpu)
179 { 165 {
180 arch_trigger_cpumask_backtrace(cpumask !! 166 arch_trigger_cpumask_backtrace(cpumask_of(cpu), false);
181 return true; 167 return true;
182 } 168 }
183 169
184 /* generic implementation */ 170 /* generic implementation */
185 void nmi_trigger_cpumask_backtrace(const cpuma 171 void nmi_trigger_cpumask_backtrace(const cpumask_t *mask,
186 int exclude !! 172 bool exclude_self,
187 void (*rais 173 void (*raise)(cpumask_t *mask));
188 bool nmi_cpu_backtrace(struct pt_regs *regs); 174 bool nmi_cpu_backtrace(struct pt_regs *regs);
189 175
190 #else 176 #else
191 static inline bool trigger_all_cpu_backtrace(v 177 static inline bool trigger_all_cpu_backtrace(void)
192 { 178 {
193 return false; 179 return false;
194 } 180 }
195 static inline bool trigger_allbutcpu_cpu_backt !! 181 static inline bool trigger_allbutself_cpu_backtrace(void)
196 { 182 {
197 return false; 183 return false;
198 } 184 }
199 static inline bool trigger_cpumask_backtrace(s 185 static inline bool trigger_cpumask_backtrace(struct cpumask *mask)
200 { 186 {
201 return false; 187 return false;
202 } 188 }
203 static inline bool trigger_single_cpu_backtrac 189 static inline bool trigger_single_cpu_backtrace(int cpu)
204 { 190 {
205 return false; 191 return false;
206 } 192 }
207 #endif 193 #endif
208 194
209 #ifdef CONFIG_HARDLOCKUP_DETECTOR_PERF 195 #ifdef CONFIG_HARDLOCKUP_DETECTOR_PERF
210 u64 hw_nmi_get_sample_period(int watchdog_thre 196 u64 hw_nmi_get_sample_period(int watchdog_thresh);
211 bool arch_perf_nmi_is_available(void); <<
212 #endif 197 #endif
213 198
214 #if defined(CONFIG_HARDLOCKUP_CHECK_TIMESTAMP) 199 #if defined(CONFIG_HARDLOCKUP_CHECK_TIMESTAMP) && \
215 defined(CONFIG_HARDLOCKUP_DETECTOR_PERF) !! 200 defined(CONFIG_HARDLOCKUP_DETECTOR)
216 void watchdog_update_hrtimer_threshold(u64 per 201 void watchdog_update_hrtimer_threshold(u64 period);
217 #else 202 #else
218 static inline void watchdog_update_hrtimer_thr 203 static inline void watchdog_update_hrtimer_threshold(u64 period) { }
219 #endif 204 #endif
220 205
>> 206 struct ctl_table;
>> 207 int proc_watchdog(struct ctl_table *, int, void *, size_t *, loff_t *);
>> 208 int proc_nmi_watchdog(struct ctl_table *, int , void *, size_t *, loff_t *);
>> 209 int proc_soft_watchdog(struct ctl_table *, int , void *, size_t *, loff_t *);
>> 210 int proc_watchdog_thresh(struct ctl_table *, int , void *, size_t *, loff_t *);
>> 211 int proc_watchdog_cpumask(struct ctl_table *, int, void *, size_t *, loff_t *);
>> 212
221 #ifdef CONFIG_HAVE_ACPI_APEI_NMI 213 #ifdef CONFIG_HAVE_ACPI_APEI_NMI
222 #include <asm/nmi.h> 214 #include <asm/nmi.h>
223 #endif <<
224 <<
225 #ifdef CONFIG_NMI_CHECK_CPU <<
226 void nmi_backtrace_stall_snap(const struct cpu <<
227 void nmi_backtrace_stall_check(const struct cp <<
228 #else <<
229 static inline void nmi_backtrace_stall_snap(co <<
230 static inline void nmi_backtrace_stall_check(c <<
231 #endif 215 #endif
232 216
233 #endif 217 #endif
234 218
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