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10#ifndef __LINUX_LOCKDEP_H
11#define __LINUX_LOCKDEP_H
12
13struct task_struct;
14struct lockdep_map;
15
16
17extern int prove_locking;
18extern int lock_stat;
19
20#define MAX_LOCKDEP_SUBCLASSES 8UL
21
22#include <linux/types.h>
23
24#ifdef CONFIG_LOCKDEP
25
26#include <linux/linkage.h>
27#include <linux/list.h>
28#include <linux/debug_locks.h>
29#include <linux/stacktrace.h>
30
31
32
33
34
35#define XXX_LOCK_USAGE_STATES (1+2*4)
36
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43
44
45
46#define NR_LOCKDEP_CACHING_CLASSES 2
47
48
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50
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52
53
54
55struct lockdep_subclass_key {
56 char __one_byte;
57} __attribute__ ((__packed__));
58
59
60struct lock_class_key {
61 union {
62 struct hlist_node hash_entry;
63 struct lockdep_subclass_key subkeys[MAX_LOCKDEP_SUBCLASSES];
64 };
65};
66
67extern struct lock_class_key __lockdep_no_validate__;
68
69struct lock_trace;
70
71#define LOCKSTAT_POINTS 4
72
73
74
75
76
77struct lock_class {
78
79
80
81 struct hlist_node hash_entry;
82
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85
86
87
88 struct list_head lock_entry;
89
90
91
92
93
94
95 struct list_head locks_after, locks_before;
96
97 const struct lockdep_subclass_key *key;
98 unsigned int subclass;
99 unsigned int dep_gen_id;
100
101
102
103
104 unsigned long usage_mask;
105 const struct lock_trace *usage_traces[XXX_LOCK_USAGE_STATES];
106
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109
110
111 int name_version;
112 const char *name;
113
114#ifdef CONFIG_LOCK_STAT
115 unsigned long contention_point[LOCKSTAT_POINTS];
116 unsigned long contending_point[LOCKSTAT_POINTS];
117#endif
118} __no_randomize_layout;
119
120#ifdef CONFIG_LOCK_STAT
121struct lock_time {
122 s64 min;
123 s64 max;
124 s64 total;
125 unsigned long nr;
126};
127
128enum bounce_type {
129 bounce_acquired_write,
130 bounce_acquired_read,
131 bounce_contended_write,
132 bounce_contended_read,
133 nr_bounce_types,
134
135 bounce_acquired = bounce_acquired_write,
136 bounce_contended = bounce_contended_write,
137};
138
139struct lock_class_stats {
140 unsigned long contention_point[LOCKSTAT_POINTS];
141 unsigned long contending_point[LOCKSTAT_POINTS];
142 struct lock_time read_waittime;
143 struct lock_time write_waittime;
144 struct lock_time read_holdtime;
145 struct lock_time write_holdtime;
146 unsigned long bounces[nr_bounce_types];
147};
148
149struct lock_class_stats lock_stats(struct lock_class *class);
150void clear_lock_stats(struct lock_class *class);
151#endif
152
153
154
155
156
157struct lockdep_map {
158 struct lock_class_key *key;
159 struct lock_class *class_cache[NR_LOCKDEP_CACHING_CLASSES];
160 const char *name;
161#ifdef CONFIG_LOCK_STAT
162 int cpu;
163 unsigned long ip;
164#endif
165};
166
167static inline void lockdep_copy_map(struct lockdep_map *to,
168 struct lockdep_map *from)
169{
170 int i;
171
172 *to = *from;
173
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179
180
181 for (i = 0; i < NR_LOCKDEP_CACHING_CLASSES; i++)
182 to->class_cache[i] = NULL;
183}
184
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187
188
189struct lock_list {
190 struct list_head entry;
191 struct lock_class *class;
192 struct lock_class *links_to;
193 const struct lock_trace *trace;
194 int distance;
195
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198
199
200 struct lock_list *parent;
201};
202
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210
211
212struct lock_chain {
213
214 unsigned int irq_context : 2,
215 depth : 6,
216 base : 24;
217
218 struct hlist_node entry;
219 u64 chain_key;
220};
221
222#define MAX_LOCKDEP_KEYS_BITS 13
223#define MAX_LOCKDEP_KEYS (1UL << MAX_LOCKDEP_KEYS_BITS)
224#define INITIAL_CHAIN_KEY -1
225
226struct held_lock {
227
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240
241 u64 prev_chain_key;
242 unsigned long acquire_ip;
243 struct lockdep_map *instance;
244 struct lockdep_map *nest_lock;
245#ifdef CONFIG_LOCK_STAT
246 u64 waittime_stamp;
247 u64 holdtime_stamp;
248#endif
249
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253
254 unsigned int class_idx:MAX_LOCKDEP_KEYS_BITS;
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267
268 unsigned int irq_context:2;
269 unsigned int trylock:1;
270
271 unsigned int read:2;
272 unsigned int check:1;
273 unsigned int hardirqs_off:1;
274 unsigned int references:12;
275 unsigned int pin_count;
276};
277
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279
280
281extern void lockdep_init(void);
282extern void lockdep_reset(void);
283extern void lockdep_reset_lock(struct lockdep_map *lock);
284extern void lockdep_free_key_range(void *start, unsigned long size);
285extern asmlinkage void lockdep_sys_exit(void);
286extern void lockdep_set_selftest_task(struct task_struct *task);
287
288extern void lockdep_init_task(struct task_struct *task);
289
290extern void lockdep_off(void);
291extern void lockdep_on(void);
292
293extern void lockdep_register_key(struct lock_class_key *key);
294extern void lockdep_unregister_key(struct lock_class_key *key);
295
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300
301
302extern void lockdep_init_map(struct lockdep_map *lock, const char *name,
303 struct lock_class_key *key, int subclass);
304
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310
311#define lockdep_set_class(lock, key) \
312 lockdep_init_map(&(lock)->dep_map, #key, key, 0)
313#define lockdep_set_class_and_name(lock, key, name) \
314 lockdep_init_map(&(lock)->dep_map, name, key, 0)
315#define lockdep_set_class_and_subclass(lock, key, sub) \
316 lockdep_init_map(&(lock)->dep_map, #key, key, sub)
317#define lockdep_set_subclass(lock, sub) \
318 lockdep_init_map(&(lock)->dep_map, #lock, \
319 (lock)->dep_map.key, sub)
320
321#define lockdep_set_novalidate_class(lock) \
322 lockdep_set_class_and_name(lock, &__lockdep_no_validate__, #lock)
323
324
325
326#define lockdep_match_class(lock, key) lockdep_match_key(&(lock)->dep_map, key)
327
328static inline int lockdep_match_key(struct lockdep_map *lock,
329 struct lock_class_key *key)
330{
331 return lock->key == key;
332}
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347
348extern void lock_acquire(struct lockdep_map *lock, unsigned int subclass,
349 int trylock, int read, int check,
350 struct lockdep_map *nest_lock, unsigned long ip);
351
352extern void lock_release(struct lockdep_map *lock, unsigned long ip);
353
354
355
356
357extern int lock_is_held_type(const struct lockdep_map *lock, int read);
358
359static inline int lock_is_held(const struct lockdep_map *lock)
360{
361 return lock_is_held_type(lock, -1);
362}
363
364#define lockdep_is_held(lock) lock_is_held(&(lock)->dep_map)
365#define lockdep_is_held_type(lock, r) lock_is_held_type(&(lock)->dep_map, (r))
366
367extern void lock_set_class(struct lockdep_map *lock, const char *name,
368 struct lock_class_key *key, unsigned int subclass,
369 unsigned long ip);
370
371static inline void lock_set_subclass(struct lockdep_map *lock,
372 unsigned int subclass, unsigned long ip)
373{
374 lock_set_class(lock, lock->name, lock->key, subclass, ip);
375}
376
377extern void lock_downgrade(struct lockdep_map *lock, unsigned long ip);
378
379struct pin_cookie { unsigned int val; };
380
381#define NIL_COOKIE (struct pin_cookie){ .val = 0U, }
382
383extern struct pin_cookie lock_pin_lock(struct lockdep_map *lock);
384extern void lock_repin_lock(struct lockdep_map *lock, struct pin_cookie);
385extern void lock_unpin_lock(struct lockdep_map *lock, struct pin_cookie);
386
387#define lockdep_depth(tsk) (debug_locks ? (tsk)->lockdep_depth : 0)
388
389#define lockdep_assert_held(l) do { \
390 WARN_ON(debug_locks && !lockdep_is_held(l)); \
391 } while (0)
392
393#define lockdep_assert_held_write(l) do { \
394 WARN_ON(debug_locks && !lockdep_is_held_type(l, 0)); \
395 } while (0)
396
397#define lockdep_assert_held_read(l) do { \
398 WARN_ON(debug_locks && !lockdep_is_held_type(l, 1)); \
399 } while (0)
400
401#define lockdep_assert_held_once(l) do { \
402 WARN_ON_ONCE(debug_locks && !lockdep_is_held(l)); \
403 } while (0)
404
405#define lockdep_recursing(tsk) ((tsk)->lockdep_recursion)
406
407#define lockdep_pin_lock(l) lock_pin_lock(&(l)->dep_map)
408#define lockdep_repin_lock(l,c) lock_repin_lock(&(l)->dep_map, (c))
409#define lockdep_unpin_lock(l,c) lock_unpin_lock(&(l)->dep_map, (c))
410
411#else
412
413static inline void lockdep_init_task(struct task_struct *task)
414{
415}
416
417static inline void lockdep_off(void)
418{
419}
420
421static inline void lockdep_on(void)
422{
423}
424
425static inline void lockdep_set_selftest_task(struct task_struct *task)
426{
427}
428
429# define lock_acquire(l, s, t, r, c, n, i) do { } while (0)
430# define lock_release(l, i) do { } while (0)
431# define lock_downgrade(l, i) do { } while (0)
432# define lock_set_class(l, n, k, s, i) do { } while (0)
433# define lock_set_subclass(l, s, i) do { } while (0)
434# define lockdep_init() do { } while (0)
435# define lockdep_init_map(lock, name, key, sub) \
436 do { (void)(name); (void)(key); } while (0)
437# define lockdep_set_class(lock, key) do { (void)(key); } while (0)
438# define lockdep_set_class_and_name(lock, key, name) \
439 do { (void)(key); (void)(name); } while (0)
440#define lockdep_set_class_and_subclass(lock, key, sub) \
441 do { (void)(key); } while (0)
442#define lockdep_set_subclass(lock, sub) do { } while (0)
443
444#define lockdep_set_novalidate_class(lock) do { } while (0)
445
446
447
448
449
450
451
452# define lockdep_reset() do { debug_locks = 1; } while (0)
453# define lockdep_free_key_range(start, size) do { } while (0)
454# define lockdep_sys_exit() do { } while (0)
455
456
457
458struct lock_class_key { };
459
460static inline void lockdep_register_key(struct lock_class_key *key)
461{
462}
463
464static inline void lockdep_unregister_key(struct lock_class_key *key)
465{
466}
467
468
469
470
471struct lockdep_map { };
472
473#define lockdep_depth(tsk) (0)
474
475#define lockdep_is_held_type(l, r) (1)
476
477#define lockdep_assert_held(l) do { (void)(l); } while (0)
478#define lockdep_assert_held_write(l) do { (void)(l); } while (0)
479#define lockdep_assert_held_read(l) do { (void)(l); } while (0)
480#define lockdep_assert_held_once(l) do { (void)(l); } while (0)
481
482#define lockdep_recursing(tsk) (0)
483
484struct pin_cookie { };
485
486#define NIL_COOKIE (struct pin_cookie){ }
487
488#define lockdep_pin_lock(l) ({ struct pin_cookie cookie = { }; cookie; })
489#define lockdep_repin_lock(l, c) do { (void)(l); (void)(c); } while (0)
490#define lockdep_unpin_lock(l, c) do { (void)(l); (void)(c); } while (0)
491
492#endif
493
494enum xhlock_context_t {
495 XHLOCK_HARD,
496 XHLOCK_SOFT,
497 XHLOCK_CTX_NR,
498};
499
500#define lockdep_init_map_crosslock(m, n, k, s) do {} while (0)
501
502
503
504
505#define STATIC_LOCKDEP_MAP_INIT(_name, _key) \
506 { .name = (_name), .key = (void *)(_key), }
507
508static inline void lockdep_invariant_state(bool force) {}
509static inline void lockdep_free_task(struct task_struct *task) {}
510
511#ifdef CONFIG_LOCK_STAT
512
513extern void lock_contended(struct lockdep_map *lock, unsigned long ip);
514extern void lock_acquired(struct lockdep_map *lock, unsigned long ip);
515
516#define LOCK_CONTENDED(_lock, try, lock) \
517do { \
518 if (!try(_lock)) { \
519 lock_contended(&(_lock)->dep_map, _RET_IP_); \
520 lock(_lock); \
521 } \
522 lock_acquired(&(_lock)->dep_map, _RET_IP_); \
523} while (0)
524
525#define LOCK_CONTENDED_RETURN(_lock, try, lock) \
526({ \
527 int ____err = 0; \
528 if (!try(_lock)) { \
529 lock_contended(&(_lock)->dep_map, _RET_IP_); \
530 ____err = lock(_lock); \
531 } \
532 if (!____err) \
533 lock_acquired(&(_lock)->dep_map, _RET_IP_); \
534 ____err; \
535})
536
537#else
538
539#define lock_contended(lockdep_map, ip) do {} while (0)
540#define lock_acquired(lockdep_map, ip) do {} while (0)
541
542#define LOCK_CONTENDED(_lock, try, lock) \
543 lock(_lock)
544
545#define LOCK_CONTENDED_RETURN(_lock, try, lock) \
546 lock(_lock)
547
548#endif
549
550#ifdef CONFIG_LOCKDEP
551
552
553
554
555
556
557#define LOCK_CONTENDED_FLAGS(_lock, try, lock, lockfl, flags) \
558 LOCK_CONTENDED((_lock), (try), (lock))
559
560#else
561
562#define LOCK_CONTENDED_FLAGS(_lock, try, lock, lockfl, flags) \
563 lockfl((_lock), (flags))
564
565#endif
566
567#ifdef CONFIG_PROVE_LOCKING
568extern void print_irqtrace_events(struct task_struct *curr);
569#else
570static inline void print_irqtrace_events(struct task_struct *curr)
571{
572}
573#endif
574
575
576
577
578
579
580#define SINGLE_DEPTH_NESTING 1
581
582
583
584
585
586
587#define lock_acquire_exclusive(l, s, t, n, i) lock_acquire(l, s, t, 0, 1, n, i)
588#define lock_acquire_shared(l, s, t, n, i) lock_acquire(l, s, t, 1, 1, n, i)
589#define lock_acquire_shared_recursive(l, s, t, n, i) lock_acquire(l, s, t, 2, 1, n, i)
590
591#define spin_acquire(l, s, t, i) lock_acquire_exclusive(l, s, t, NULL, i)
592#define spin_acquire_nest(l, s, t, n, i) lock_acquire_exclusive(l, s, t, n, i)
593#define spin_release(l, i) lock_release(l, i)
594
595#define rwlock_acquire(l, s, t, i) lock_acquire_exclusive(l, s, t, NULL, i)
596#define rwlock_acquire_read(l, s, t, i) lock_acquire_shared_recursive(l, s, t, NULL, i)
597#define rwlock_release(l, i) lock_release(l, i)
598
599#define seqcount_acquire(l, s, t, i) lock_acquire_exclusive(l, s, t, NULL, i)
600#define seqcount_acquire_read(l, s, t, i) lock_acquire_shared_recursive(l, s, t, NULL, i)
601#define seqcount_release(l, i) lock_release(l, i)
602
603#define mutex_acquire(l, s, t, i) lock_acquire_exclusive(l, s, t, NULL, i)
604#define mutex_acquire_nest(l, s, t, n, i) lock_acquire_exclusive(l, s, t, n, i)
605#define mutex_release(l, i) lock_release(l, i)
606
607#define rwsem_acquire(l, s, t, i) lock_acquire_exclusive(l, s, t, NULL, i)
608#define rwsem_acquire_nest(l, s, t, n, i) lock_acquire_exclusive(l, s, t, n, i)
609#define rwsem_acquire_read(l, s, t, i) lock_acquire_shared(l, s, t, NULL, i)
610#define rwsem_release(l, i) lock_release(l, i)
611
612#define lock_map_acquire(l) lock_acquire_exclusive(l, 0, 0, NULL, _THIS_IP_)
613#define lock_map_acquire_read(l) lock_acquire_shared_recursive(l, 0, 0, NULL, _THIS_IP_)
614#define lock_map_acquire_tryread(l) lock_acquire_shared_recursive(l, 0, 1, NULL, _THIS_IP_)
615#define lock_map_release(l) lock_release(l, _THIS_IP_)
616
617#ifdef CONFIG_PROVE_LOCKING
618# define might_lock(lock) \
619do { \
620 typecheck(struct lockdep_map *, &(lock)->dep_map); \
621 lock_acquire(&(lock)->dep_map, 0, 0, 0, 1, NULL, _THIS_IP_); \
622 lock_release(&(lock)->dep_map, _THIS_IP_); \
623} while (0)
624# define might_lock_read(lock) \
625do { \
626 typecheck(struct lockdep_map *, &(lock)->dep_map); \
627 lock_acquire(&(lock)->dep_map, 0, 0, 1, 1, NULL, _THIS_IP_); \
628 lock_release(&(lock)->dep_map, _THIS_IP_); \
629} while (0)
630# define might_lock_nested(lock, subclass) \
631do { \
632 typecheck(struct lockdep_map *, &(lock)->dep_map); \
633 lock_acquire(&(lock)->dep_map, subclass, 0, 1, 1, NULL, \
634 _THIS_IP_); \
635 lock_release(&(lock)->dep_map, _THIS_IP_); \
636} while (0)
637
638#define lockdep_assert_irqs_enabled() do { \
639 WARN_ONCE(debug_locks && !current->lockdep_recursion && \
640 !current->hardirqs_enabled, \
641 "IRQs not enabled as expected\n"); \
642 } while (0)
643
644#define lockdep_assert_irqs_disabled() do { \
645 WARN_ONCE(debug_locks && !current->lockdep_recursion && \
646 current->hardirqs_enabled, \
647 "IRQs not disabled as expected\n"); \
648 } while (0)
649
650#define lockdep_assert_in_irq() do { \
651 WARN_ONCE(debug_locks && !current->lockdep_recursion && \
652 !current->hardirq_context, \
653 "Not in hardirq as expected\n"); \
654 } while (0)
655
656#else
657# define might_lock(lock) do { } while (0)
658# define might_lock_read(lock) do { } while (0)
659# define might_lock_nested(lock, subclass) do { } while (0)
660# define lockdep_assert_irqs_enabled() do { } while (0)
661# define lockdep_assert_irqs_disabled() do { } while (0)
662# define lockdep_assert_in_irq() do { } while (0)
663#endif
664
665#ifdef CONFIG_LOCKDEP
666void lockdep_rcu_suspicious(const char *file, const int line, const char *s);
667#else
668static inline void
669lockdep_rcu_suspicious(const char *file, const int line, const char *s)
670{
671}
672#endif
673
674#endif
675