aboutsummaryrefslogtreecommitdiff
path: root/include/linux/spinlock_api_smp.h
blob: 7a7e18fc2415e86c4a9fea767a0e43a001b51bcd (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
#ifndef __LINUX_SPINLOCK_API_SMP_H
#define __LINUX_SPINLOCK_API_SMP_H

#ifndef __LINUX_SPINLOCK_H
# error "please don't include this file directly"
#endif

/*
 * include/linux/spinlock_api_smp.h
 *
 * spinlock API declarations on SMP (and debug)
 * (implemented in kernel/spinlock.c)
 *
 * portions Copyright 2005, Red Hat, Inc., Ingo Molnar
 * Released under the General Public License (GPL).
 */

int in_lock_functions(unsigned long addr);

#define assert_spin_locked(x)	BUG_ON(!spin_is_locked(x))

void __lockfunc _spin_lock(spinlock_t *lock)		__acquires(lock);
void __lockfunc _spin_lock_nested(spinlock_t *lock, int subclass)
							__acquires(lock);
void __lockfunc _spin_lock_nest_lock(spinlock_t *lock, struct lockdep_map *map)
							__acquires(lock);
void __lockfunc _read_lock(rwlock_t *lock)		__acquires(lock);
void __lockfunc _write_lock(rwlock_t *lock)		__acquires(lock);
void __lockfunc _spin_lock_bh(spinlock_t *lock)		__acquires(lock);
void __lockfunc _read_lock_bh(rwlock_t *lock)		__acquires(lock);
void __lockfunc _write_lock_bh(rwlock_t *lock)		__acquires(lock);
void __lockfunc _spin_lock_irq(spinlock_t *lock)	__acquires(lock);
void __lockfunc _read_lock_irq(rwlock_t *lock)		__acquires(lock);
void __lockfunc _write_lock_irq(rwlock_t *lock)		__acquires(lock);
unsigned long __lockfunc _spin_lock_irqsave(spinlock_t *lock)
							__acquires(lock);
unsigned long __lockfunc _spin_lock_irqsave_nested(spinlock_t *lock, int subclass)
							__acquires(lock);
unsigned long __lockfunc _read_lock_irqsave(rwlock_t *lock)
							__acquires(lock);
unsigned long __lockfunc _write_lock_irqsave(rwlock_t *lock)
							__acquires(lock);
int __lockfunc _spin_trylock(spinlock_t *lock);
int __lockfunc _read_trylock(rwlock_t *lock);
int __lockfunc _write_trylock(rwlock_t *lock);
int __lockfunc _spin_trylock_bh(spinlock_t *lock);
void __lockfunc _spin_unlock(spinlock_t *lock)		__releases(lock);
void __lockfunc _read_unlock(rwlock_t *lock)		__releases(lock);
void __lockfunc _write_unlock(rwlock_t *lock)		__releases(lock);
void __lockfunc _spin_unlock_bh(spinlock_t *lock)	__releases(lock);
void __lockfunc _read_unlock_bh(rwlock_t *lock)		__releases(lock);
void __lockfunc _write_unlock_bh(rwlock_t *lock)	__releases(lock);
void __lockfunc _spin_unlock_irq(spinlock_t *lock)	__releases(lock);
void __lockfunc _read_unlock_irq(rwlock_t *lock)	__releases(lock);
void __lockfunc _write_unlock_irq(rwlock_t *lock)	__releases(lock);
void __lockfunc _spin_unlock_irqrestore(spinlock_t *lock, unsigned long flags)
							__releases(lock);
void __lockfunc _read_unlock_irqrestore(rwlock_t *lock, unsigned long flags)
							__releases(lock);
void __lockfunc _write_unlock_irqrestore(rwlock_t *lock, unsigned long flags)
							__releases(lock);

/*
 * We inline the unlock functions in the nondebug case:
 */
#if !defined(CONFIG_DEBUG_SPINLOCK) && !defined(CONFIG_PREEMPT)
#define __always_inline__spin_unlock
#define __always_inline__read_unlock
#define __always_inline__write_unlock
#define __always_inline__spin_unlock_irq
#define __always_inline__read_unlock_irq
#define __always_inline__write_unlock_irq
#endif

#ifndef CONFIG_DEBUG_SPINLOCK
#ifndef CONFIG_GENERIC_LOCKBREAK

#ifdef __always_inline__spin_lock
#define _spin_lock(lock) __spin_lock(lock)
#endif

#ifdef __always_inline__read_lock
#define _read_lock(lock) __read_lock(lock)
#endif

#ifdef __always_inline__write_lock
#define _write_lock(lock) __write_lock(lock)
#endif

#ifdef __always_inline__spin_lock_bh
#define _spin_lock_bh(lock) __spin_lock_bh(lock)
#endif

#ifdef __always_inline__read_lock_bh
#define _read_lock_bh(lock) __read_lock_bh(lock)
#endif

#ifdef __always_inline__write_lock_bh
#define _write_lock_bh(lock) __write_lock_bh(lock)
#endif

#ifdef __always_inline__spin_lock_irq
#define _spin_lock_irq(lock) __spin_lock_irq(lock)
#endif

#ifdef __always_inline__read_lock_irq
#define _read_lock_irq(lock) __read_lock_irq(lock)
#endif

#ifdef __always_inline__write_lock_irq
#define _write_lock_irq(lock) __write_lock_irq(lock)
#endif

#ifdef __always_inline__spin_lock_irqsave
#define _spin_lock_irqsave(lock) __spin_lock_irqsave(lock)
#endif

#ifdef __always_inline__read_lock_irqsave
#define _read_lock_irqsave(lock) __read_lock_irqsave(lock)
#endif

#ifdef __always_inline__write_lock_irqsave
#define _write_lock_irqsave(lock) __write_lock_irqsave(lock)
#endif

#endif /* !CONFIG_GENERIC_LOCKBREAK */

#ifdef __always_inline__spin_trylock
#define _spin_trylock(lock) __spin_trylock(lock)
#endif

#ifdef __always_inline__read_trylock
#define _read_trylock(lock) __read_trylock(lock)
#endif

#ifdef __always_inline__write_trylock
#define _write_trylock(lock) __write_trylock(lock)
#endif

#ifdef __always_inline__spin_trylock_bh
#define _spin_trylock_bh(lock) __spin_trylock_bh(lock)
#endif

#ifdef __always_inline__spin_unlock
#define _spin_unlock(lock) __spin_unlock(lock)
#endif

#ifdef __always_inline__read_unlock
#define _read_unlock(lock) __read_unlock(lock)
#endif

#ifdef __always_inline__write_unlock
#define _write_unlock(lock) __write_unlock(lock)
#endif

#ifdef __always_inline__spin_unlock_bh
#define _spin_unlock_bh(lock) __spin_unlock_bh(lock)
#endif

#ifdef __always_inline__read_unlock_bh
#define _read_unlock_bh(lock) __read_unlock_bh(lock)
#endif

#ifdef __always_inline__write_unlock_bh
#define _write_unlock_bh(lock) __write_unlock_bh(lock)
#endif

#ifdef __always_inline__spin_unlock_irq
#define _spin_unlock_irq(lock) __spin_unlock_irq(lock)
#endif

#ifdef __always_inline__read_unlock_irq
#define _read_unlock_irq(lock) __read_unlock_irq(lock)
#endif

#ifdef __always_inline__write_unlock_irq
#define _write_unlock_irq(lock) __write_unlock_irq(lock)
#endif

#ifdef __always_inline__spin_unlock_irqrestore
#define _spin_unlock_irqrestore(lock, flags) __spin_unlock_irqrestore(lock, flags)
#endif

#ifdef __always_inline__read_unlock_irqrestore
#define _read_unlock_irqrestore(lock, flags) __read_unlock_irqrestore(lock, flags)
#endif

#ifdef __always_inline__write_unlock_irqrestore
#define _write_unlock_irqrestore(lock, flags) __write_unlock_irqrestore(lock, flags)
#endif

#endif /* CONFIG_DEBUG_SPINLOCK */

static inline int __spin_trylock(spinlock_t *lock)
{
	preempt_disable();
	if (_raw_spin_trylock(lock)) {
		spin_acquire(&lock->dep_map, 0, 1, _RET_IP_);
		return 1;
	}
	preempt_enable();
	return 0;
}

static inline int __read_trylock(rwlock_t *lock)
{
	preempt_disable();
	if (_raw_read_trylock(lock)) {
		rwlock_acquire_read(&lock->dep_map, 0, 1, _RET_IP_);
		return 1;
	}
	preempt_enable();
	return 0;
}

static inline int __write_trylock(rwlock_t *lock)
{
	preempt_disable();
	if (_raw_write_trylock(lock)) {
		rwlock_acquire(&lock->dep_map, 0, 1, _RET_IP_);
		return 1;
	}
	preempt_enable();
	return 0;
}

/*
 * If lockdep is enabled then we use the non-preemption spin-ops
 * even on CONFIG_PREEMPT, because lockdep assumes that interrupts are
 * not re-enabled during lock-acquire (which the preempt-spin-ops do):
 */
#if !defined(CONFIG_GENERIC_LOCKBREAK) || defined(CONFIG_DEBUG_LOCK_ALLOC)

static inline void __read_lock(rwlock_t *lock)
{
	preempt_disable();
	rwlock_acquire_read(&lock->dep_map, 0, 0, _RET_IP_);
	LOCK_CONTENDED(lock, _raw_read_trylock, _raw_read_lock);
}

static inline unsigned long __spin_lock_irqsave(spinlock_t *lock)
{
	unsigned long flags;

	local_irq_save(flags);
	preempt_disable();
	spin_acquire(&lock->dep_map, 0, 0, _RET_IP_);
	/*
	 * On lockdep we dont want the hand-coded irq-enable of
	 * _raw_spin_lock_flags() code, because lockdep assumes
	 * that interrupts are not re-enabled during lock-acquire:
	 */
#ifdef CONFIG_LOCKDEP
	LOCK_CONTENDED(lock, _raw_spin_trylock, _raw_spin_lock);
#else
	_raw_spin_lock_flags(lock, &flags);
#endif
	return flags;
}

static inline void __spin_lock_irq(spinlock_t *lock)
{
	local_irq_disable();
	preempt_disable();
	spin_acquire(&lock->dep_map, 0, 0, _RET_IP_);
	LOCK_CONTENDED(lock, _raw_spin_trylock, _raw_spin_lock);
}

static inline void __spin_lock_bh(spinlock_t *lock)
{
	local_bh_disable();
	preempt_disable();
	spin_acquire(&lock->dep_map, 0, 0, _RET_IP_);
	LOCK_CONTENDED(lock, _raw_spin_trylock, _raw_spin_lock);
}

static inline unsigned long __read_lock_irqsave(rwlock_t *lock)
{
	unsigned long flags;

	local_irq_save(flags);
	preempt_disable();
	rwlock_acquire_read(&lock->dep_map, 0, 0, _RET_IP_);
	LOCK_CONTENDED_FLAGS(lock, _raw_read_trylock, _raw_read_lock,
			     _raw_read_lock_flags, &flags);
	return flags;
}

static inline void __read_lock_irq(rwlock_t *lock)
{
	local_irq_disable();
	preempt_disable();
	rwlock_acquire_read(&lock->dep_map, 0, 0, _RET_IP_);
	LOCK_CONTENDED(lock, _raw_read_trylock, _raw_read_lock);
}

static inline void __read_lock_bh(rwlock_t *lock)
{
	local_bh_disable();
	preempt_disable();
	rwlock_acquire_read(&lock->dep_map, 0, 0, _RET_IP_);
	LOCK_CONTENDED(lock, _raw_read_trylock, _raw_read_lock);
}

static inline unsigned long __write_lock_irqsave(rwlock_t *lock)
{
	unsigned long flags;

	local_irq_save(flags);
	preempt_disable();
	rwlock_acquire(&lock->dep_map, 0, 0, _RET_IP_);
	LOCK_CONTENDED_FLAGS(lock, _raw_write_trylock, _raw_write_lock,
			     _raw_write_lock_flags, &flags);
	return flags;
}

static inline void __write_lock_irq(rwlock_t *lock)
{
	local_irq_disable();
	preempt_disable();
	rwlock_acquire(&lock->dep_map, 0, 0, _RET_IP_);
	LOCK_CONTENDED(lock, _raw_write_trylock, _raw_write_lock);
}

static inline void __write_lock_bh(rwlock_t *lock)
{
	local_bh_disable();
	preempt_disable();
	rwlock_acquire(&lock->dep_map, 0, 0, _RET_IP_);
	LOCK_CONTENDED(lock, _raw_write_trylock, _raw_write_lock);
}

static inline void __spin_lock(spinlock_t *lock)
{
	preempt_disable();
	spin_acquire(&lock->dep_map, 0, 0, _RET_IP_);
	LOCK_CONTENDED(lock, _raw_spin_trylock, _raw_spin_lock);
}

static inline void __write_lock(rwlock_t *lock)
{
	preempt_disable();
	rwlock_acquire(&lock->dep_map, 0, 0, _RET_IP_);
	LOCK_CONTENDED(lock, _raw_write_trylock, _raw_write_lock);
}

#endif /* CONFIG_PREEMPT */

static inline void __spin_unlock(spinlock_t *lock)
{
	spin_release(&lock->dep_map, 1, _RET_IP_);
	_raw_spin_unlock(lock);
	preempt_enable();
}

static inline void __write_unlock(rwlock_t *lock)
{
	rwlock_release(&lock->dep_map, 1, _RET_IP_);
	_raw_write_unlock(lock);
	preempt_enable();
}

static inline void __read_unlock(rwlock_t *lock)
{
	rwlock_release(&lock->dep_map, 1, _RET_IP_);
	_raw_read_unlock(lock);
	preempt_enable();
}

static inline void __spin_unlock_irqrestore(spinlock_t *lock,
					    unsigned long flags)
{
	spin_release(&lock->dep_map, 1, _RET_IP_);
	_raw_spin_unlock(lock);
	local_irq_restore(flags);
	preempt_enable();
}

static inline void __spin_unlock_irq(spinlock_t *lock)
{
	spin_release(&lock->dep_map, 1, _RET_IP_);
	_raw_spin_unlock(lock);
	local_irq_enable();
	preempt_enable();
}

static inline void __spin_unlock_bh(spinlock_t *lock)
{
	spin_release(&lock->dep_map, 1, _RET_IP_);
	_raw_spin_unlock(lock);
	preempt_enable_no_resched();
	local_bh_enable_ip((unsigned long)__builtin_return_address(0));
}

static inline void __read_unlock_irqrestore(rwlock_t *lock, unsigned long flags)
{
	rwlock_release(&lock->dep_map, 1, _RET_IP_);
	_raw_read_unlock(lock);
	local_irq_restore(flags);
	preempt_enable();
}

static inline void __read_unlock_irq(rwlock_t *lock)
{
	rwlock_release(&lock->dep_map, 1, _RET_IP_);
	_raw_read_unlock(lock);
	local_irq_enable();
	preempt_enable();
}

static inline void __read_unlock_bh(rwlock_t *lock)
{
	rwlock_release(&lock->dep_map, 1, _RET_IP_);
	_raw_read_unlock(lock);
	preempt_enable_no_resched();
	local_bh_enable_ip((unsigned long)__builtin_return_address(0));
}

static inline void __write_unlock_irqrestore(rwlock_t *lock,
					     unsigned long flags)
{
	rwlock_release(&lock->dep_map, 1, _RET_IP_);
	_raw_write_unlock(lock);
	local_irq_restore(flags);
	preempt_enable();
}

static inline void __write_unlock_irq(rwlock_t *lock)
{
	rwlock_release(&lock->dep_map, 1, _RET_IP_);
	_raw_write_unlock(lock);
	local_irq_enable();
	preempt_enable();
}

static inline void __write_unlock_bh(rwlock_t *lock)
{
	rwlock_release(&lock->dep_map, 1, _RET_IP_);
	_raw_write_unlock(lock);
	preempt_enable_no_resched();
	local_bh_enable_ip((unsigned long)__builtin_return_address(0));
}

static inline int __spin_trylock_bh(spinlock_t *lock)
{
	local_bh_disable();
	preempt_disable();
	if (_raw_spin_trylock(lock)) {
		spin_acquire(&lock->dep_map, 0, 1, _RET_IP_);
		return 1;
	}
	preempt_enable_no_resched();
	local_bh_enable_ip((unsigned long)__builtin_return_address(0));
	return 0;
}

#endif /* __LINUX_SPINLOCK_API_SMP_H */