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TOMOYO Linux Cross Reference
Linux/kernel/locking/spinlock.c

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  1 /*
  2  * Copyright (2004) Linus Torvalds
  3  *
  4  * Author: Zwane Mwaikambo <zwane@fsmlabs.com>
  5  *
  6  * Copyright (2004, 2005) Ingo Molnar
  7  *
  8  * This file contains the spinlock/rwlock implementations for the
  9  * SMP and the DEBUG_SPINLOCK cases. (UP-nondebug inlines them)
 10  *
 11  * Note that some architectures have special knowledge about the
 12  * stack frames of these functions in their profile_pc. If you
 13  * change anything significant here that could change the stack
 14  * frame contact the architecture maintainers.
 15  */
 16 
 17 #include <linux/linkage.h>
 18 #include <linux/preempt.h>
 19 #include <linux/spinlock.h>
 20 #include <linux/interrupt.h>
 21 #include <linux/debug_locks.h>
 22 #include <linux/export.h>
 23 
 24 /*
 25  * If lockdep is enabled then we use the non-preemption spin-ops
 26  * even on CONFIG_PREEMPT, because lockdep assumes that interrupts are
 27  * not re-enabled during lock-acquire (which the preempt-spin-ops do):
 28  */
 29 #if !defined(CONFIG_GENERIC_LOCKBREAK) || defined(CONFIG_DEBUG_LOCK_ALLOC)
 30 /*
 31  * The __lock_function inlines are taken from
 32  * include/linux/spinlock_api_smp.h
 33  */
 34 #else
 35 #define raw_read_can_lock(l)    read_can_lock(l)
 36 #define raw_write_can_lock(l)   write_can_lock(l)
 37 
 38 /*
 39  * Some architectures can relax in favour of the CPU owning the lock.
 40  */
 41 #ifndef arch_read_relax
 42 # define arch_read_relax(l)     cpu_relax()
 43 #endif
 44 #ifndef arch_write_relax
 45 # define arch_write_relax(l)    cpu_relax()
 46 #endif
 47 #ifndef arch_spin_relax
 48 # define arch_spin_relax(l)     cpu_relax()
 49 #endif
 50 
 51 /*
 52  * We build the __lock_function inlines here. They are too large for
 53  * inlining all over the place, but here is only one user per function
 54  * which embedds them into the calling _lock_function below.
 55  *
 56  * This could be a long-held lock. We both prepare to spin for a long
 57  * time (making _this_ CPU preemptable if possible), and we also signal
 58  * towards that other CPU that it should break the lock ASAP.
 59  */
 60 #define BUILD_LOCK_OPS(op, locktype)                                    \
 61 void __lockfunc __raw_##op##_lock(locktype##_t *lock)                   \
 62 {                                                                       \
 63         for (;;) {                                                      \
 64                 preempt_disable();                                      \
 65                 if (likely(do_raw_##op##_trylock(lock)))                \
 66                         break;                                          \
 67                 preempt_enable();                                       \
 68                                                                         \
 69                 if (!(lock)->break_lock)                                \
 70                         (lock)->break_lock = 1;                         \
 71                 while (!raw_##op##_can_lock(lock) && (lock)->break_lock)\
 72                         arch_##op##_relax(&lock->raw_lock);             \
 73         }                                                               \
 74         (lock)->break_lock = 0;                                         \
 75 }                                                                       \
 76                                                                         \
 77 unsigned long __lockfunc __raw_##op##_lock_irqsave(locktype##_t *lock)  \
 78 {                                                                       \
 79         unsigned long flags;                                            \
 80                                                                         \
 81         for (;;) {                                                      \
 82                 preempt_disable();                                      \
 83                 local_irq_save(flags);                                  \
 84                 if (likely(do_raw_##op##_trylock(lock)))                \
 85                         break;                                          \
 86                 local_irq_restore(flags);                               \
 87                 preempt_enable();                                       \
 88                                                                         \
 89                 if (!(lock)->break_lock)                                \
 90                         (lock)->break_lock = 1;                         \
 91                 while (!raw_##op##_can_lock(lock) && (lock)->break_lock)\
 92                         arch_##op##_relax(&lock->raw_lock);             \
 93         }                                                               \
 94         (lock)->break_lock = 0;                                         \
 95         return flags;                                                   \
 96 }                                                                       \
 97                                                                         \
 98 void __lockfunc __raw_##op##_lock_irq(locktype##_t *lock)               \
 99 {                                                                       \
100         _raw_##op##_lock_irqsave(lock);                                 \
101 }                                                                       \
102                                                                         \
103 void __lockfunc __raw_##op##_lock_bh(locktype##_t *lock)                \
104 {                                                                       \
105         unsigned long flags;                                            \
106                                                                         \
107         /*                                                      */      \
108         /* Careful: we must exclude softirqs too, hence the     */      \
109         /* irq-disabling. We use the generic preemption-aware   */      \
110         /* function:                                            */      \
111         /**/                                                            \
112         flags = _raw_##op##_lock_irqsave(lock);                         \
113         local_bh_disable();                                             \
114         local_irq_restore(flags);                                       \
115 }                                                                       \
116 
117 /*
118  * Build preemption-friendly versions of the following
119  * lock-spinning functions:
120  *
121  *         __[spin|read|write]_lock()
122  *         __[spin|read|write]_lock_irq()
123  *         __[spin|read|write]_lock_irqsave()
124  *         __[spin|read|write]_lock_bh()
125  */
126 BUILD_LOCK_OPS(spin, raw_spinlock);
127 BUILD_LOCK_OPS(read, rwlock);
128 BUILD_LOCK_OPS(write, rwlock);
129 
130 #endif
131 
132 #ifndef CONFIG_INLINE_SPIN_TRYLOCK
133 int __lockfunc _raw_spin_trylock(raw_spinlock_t *lock)
134 {
135         return __raw_spin_trylock(lock);
136 }
137 EXPORT_SYMBOL(_raw_spin_trylock);
138 #endif
139 
140 #ifndef CONFIG_INLINE_SPIN_TRYLOCK_BH
141 int __lockfunc _raw_spin_trylock_bh(raw_spinlock_t *lock)
142 {
143         return __raw_spin_trylock_bh(lock);
144 }
145 EXPORT_SYMBOL(_raw_spin_trylock_bh);
146 #endif
147 
148 #ifndef CONFIG_INLINE_SPIN_LOCK
149 void __lockfunc _raw_spin_lock(raw_spinlock_t *lock)
150 {
151         __raw_spin_lock(lock);
152 }
153 EXPORT_SYMBOL(_raw_spin_lock);
154 #endif
155 
156 #ifndef CONFIG_INLINE_SPIN_LOCK_IRQSAVE
157 unsigned long __lockfunc _raw_spin_lock_irqsave(raw_spinlock_t *lock)
158 {
159         return __raw_spin_lock_irqsave(lock);
160 }
161 EXPORT_SYMBOL(_raw_spin_lock_irqsave);
162 #endif
163 
164 #ifndef CONFIG_INLINE_SPIN_LOCK_IRQ
165 void __lockfunc _raw_spin_lock_irq(raw_spinlock_t *lock)
166 {
167         __raw_spin_lock_irq(lock);
168 }
169 EXPORT_SYMBOL(_raw_spin_lock_irq);
170 #endif
171 
172 #ifndef CONFIG_INLINE_SPIN_LOCK_BH
173 void __lockfunc _raw_spin_lock_bh(raw_spinlock_t *lock)
174 {
175         __raw_spin_lock_bh(lock);
176 }
177 EXPORT_SYMBOL(_raw_spin_lock_bh);
178 #endif
179 
180 #ifdef CONFIG_UNINLINE_SPIN_UNLOCK
181 void __lockfunc _raw_spin_unlock(raw_spinlock_t *lock)
182 {
183         __raw_spin_unlock(lock);
184 }
185 EXPORT_SYMBOL(_raw_spin_unlock);
186 #endif
187 
188 #ifndef CONFIG_INLINE_SPIN_UNLOCK_IRQRESTORE
189 void __lockfunc _raw_spin_unlock_irqrestore(raw_spinlock_t *lock, unsigned long flags)
190 {
191         __raw_spin_unlock_irqrestore(lock, flags);
192 }
193 EXPORT_SYMBOL(_raw_spin_unlock_irqrestore);
194 #endif
195 
196 #ifndef CONFIG_INLINE_SPIN_UNLOCK_IRQ
197 void __lockfunc _raw_spin_unlock_irq(raw_spinlock_t *lock)
198 {
199         __raw_spin_unlock_irq(lock);
200 }
201 EXPORT_SYMBOL(_raw_spin_unlock_irq);
202 #endif
203 
204 #ifndef CONFIG_INLINE_SPIN_UNLOCK_BH
205 void __lockfunc _raw_spin_unlock_bh(raw_spinlock_t *lock)
206 {
207         __raw_spin_unlock_bh(lock);
208 }
209 EXPORT_SYMBOL(_raw_spin_unlock_bh);
210 #endif
211 
212 #ifndef CONFIG_INLINE_READ_TRYLOCK
213 int __lockfunc _raw_read_trylock(rwlock_t *lock)
214 {
215         return __raw_read_trylock(lock);
216 }
217 EXPORT_SYMBOL(_raw_read_trylock);
218 #endif
219 
220 #ifndef CONFIG_INLINE_READ_LOCK
221 void __lockfunc _raw_read_lock(rwlock_t *lock)
222 {
223         __raw_read_lock(lock);
224 }
225 EXPORT_SYMBOL(_raw_read_lock);
226 #endif
227 
228 #ifndef CONFIG_INLINE_READ_LOCK_IRQSAVE
229 unsigned long __lockfunc _raw_read_lock_irqsave(rwlock_t *lock)
230 {
231         return __raw_read_lock_irqsave(lock);
232 }
233 EXPORT_SYMBOL(_raw_read_lock_irqsave);
234 #endif
235 
236 #ifndef CONFIG_INLINE_READ_LOCK_IRQ
237 void __lockfunc _raw_read_lock_irq(rwlock_t *lock)
238 {
239         __raw_read_lock_irq(lock);
240 }
241 EXPORT_SYMBOL(_raw_read_lock_irq);
242 #endif
243 
244 #ifndef CONFIG_INLINE_READ_LOCK_BH
245 void __lockfunc _raw_read_lock_bh(rwlock_t *lock)
246 {
247         __raw_read_lock_bh(lock);
248 }
249 EXPORT_SYMBOL(_raw_read_lock_bh);
250 #endif
251 
252 #ifndef CONFIG_INLINE_READ_UNLOCK
253 void __lockfunc _raw_read_unlock(rwlock_t *lock)
254 {
255         __raw_read_unlock(lock);
256 }
257 EXPORT_SYMBOL(_raw_read_unlock);
258 #endif
259 
260 #ifndef CONFIG_INLINE_READ_UNLOCK_IRQRESTORE
261 void __lockfunc _raw_read_unlock_irqrestore(rwlock_t *lock, unsigned long flags)
262 {
263         __raw_read_unlock_irqrestore(lock, flags);
264 }
265 EXPORT_SYMBOL(_raw_read_unlock_irqrestore);
266 #endif
267 
268 #ifndef CONFIG_INLINE_READ_UNLOCK_IRQ
269 void __lockfunc _raw_read_unlock_irq(rwlock_t *lock)
270 {
271         __raw_read_unlock_irq(lock);
272 }
273 EXPORT_SYMBOL(_raw_read_unlock_irq);
274 #endif
275 
276 #ifndef CONFIG_INLINE_READ_UNLOCK_BH
277 void __lockfunc _raw_read_unlock_bh(rwlock_t *lock)
278 {
279         __raw_read_unlock_bh(lock);
280 }
281 EXPORT_SYMBOL(_raw_read_unlock_bh);
282 #endif
283 
284 #ifndef CONFIG_INLINE_WRITE_TRYLOCK
285 int __lockfunc _raw_write_trylock(rwlock_t *lock)
286 {
287         return __raw_write_trylock(lock);
288 }
289 EXPORT_SYMBOL(_raw_write_trylock);
290 #endif
291 
292 #ifndef CONFIG_INLINE_WRITE_LOCK
293 void __lockfunc _raw_write_lock(rwlock_t *lock)
294 {
295         __raw_write_lock(lock);
296 }
297 EXPORT_SYMBOL(_raw_write_lock);
298 #endif
299 
300 #ifndef CONFIG_INLINE_WRITE_LOCK_IRQSAVE
301 unsigned long __lockfunc _raw_write_lock_irqsave(rwlock_t *lock)
302 {
303         return __raw_write_lock_irqsave(lock);
304 }
305 EXPORT_SYMBOL(_raw_write_lock_irqsave);
306 #endif
307 
308 #ifndef CONFIG_INLINE_WRITE_LOCK_IRQ
309 void __lockfunc _raw_write_lock_irq(rwlock_t *lock)
310 {
311         __raw_write_lock_irq(lock);
312 }
313 EXPORT_SYMBOL(_raw_write_lock_irq);
314 #endif
315 
316 #ifndef CONFIG_INLINE_WRITE_LOCK_BH
317 void __lockfunc _raw_write_lock_bh(rwlock_t *lock)
318 {
319         __raw_write_lock_bh(lock);
320 }
321 EXPORT_SYMBOL(_raw_write_lock_bh);
322 #endif
323 
324 #ifndef CONFIG_INLINE_WRITE_UNLOCK
325 void __lockfunc _raw_write_unlock(rwlock_t *lock)
326 {
327         __raw_write_unlock(lock);
328 }
329 EXPORT_SYMBOL(_raw_write_unlock);
330 #endif
331 
332 #ifndef CONFIG_INLINE_WRITE_UNLOCK_IRQRESTORE
333 void __lockfunc _raw_write_unlock_irqrestore(rwlock_t *lock, unsigned long flags)
334 {
335         __raw_write_unlock_irqrestore(lock, flags);
336 }
337 EXPORT_SYMBOL(_raw_write_unlock_irqrestore);
338 #endif
339 
340 #ifndef CONFIG_INLINE_WRITE_UNLOCK_IRQ
341 void __lockfunc _raw_write_unlock_irq(rwlock_t *lock)
342 {
343         __raw_write_unlock_irq(lock);
344 }
345 EXPORT_SYMBOL(_raw_write_unlock_irq);
346 #endif
347 
348 #ifndef CONFIG_INLINE_WRITE_UNLOCK_BH
349 void __lockfunc _raw_write_unlock_bh(rwlock_t *lock)
350 {
351         __raw_write_unlock_bh(lock);
352 }
353 EXPORT_SYMBOL(_raw_write_unlock_bh);
354 #endif
355 
356 #ifdef CONFIG_DEBUG_LOCK_ALLOC
357 
358 void __lockfunc _raw_spin_lock_nested(raw_spinlock_t *lock, int subclass)
359 {
360         preempt_disable();
361         spin_acquire(&lock->dep_map, subclass, 0, _RET_IP_);
362         LOCK_CONTENDED(lock, do_raw_spin_trylock, do_raw_spin_lock);
363 }
364 EXPORT_SYMBOL(_raw_spin_lock_nested);
365 
366 unsigned long __lockfunc _raw_spin_lock_irqsave_nested(raw_spinlock_t *lock,
367                                                    int subclass)
368 {
369         unsigned long flags;
370 
371         local_irq_save(flags);
372         preempt_disable();
373         spin_acquire(&lock->dep_map, subclass, 0, _RET_IP_);
374         LOCK_CONTENDED_FLAGS(lock, do_raw_spin_trylock, do_raw_spin_lock,
375                                 do_raw_spin_lock_flags, &flags);
376         return flags;
377 }
378 EXPORT_SYMBOL(_raw_spin_lock_irqsave_nested);
379 
380 void __lockfunc _raw_spin_lock_nest_lock(raw_spinlock_t *lock,
381                                      struct lockdep_map *nest_lock)
382 {
383         preempt_disable();
384         spin_acquire_nest(&lock->dep_map, 0, 0, nest_lock, _RET_IP_);
385         LOCK_CONTENDED(lock, do_raw_spin_trylock, do_raw_spin_lock);
386 }
387 EXPORT_SYMBOL(_raw_spin_lock_nest_lock);
388 
389 #endif
390 
391 notrace int in_lock_functions(unsigned long addr)
392 {
393         /* Linker adds these: start and end of __lockfunc functions */
394         extern char __lock_text_start[], __lock_text_end[];
395 
396         return addr >= (unsigned long)__lock_text_start
397         && addr < (unsigned long)__lock_text_end;
398 }
399 EXPORT_SYMBOL(in_lock_functions);
400 

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