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1 | #ifndef __LINUX_SPINLOCK_H |
2 | #define __LINUX_SPINLOCK_H |
3 | |
4 | /* |
5 | * include/linux/spinlock.h - generic spinlock/rwlock declarations |
6 | * |
7 | * here's the role of the various spinlock/rwlock related include files: |
8 | * |
9 | * on SMP builds: |
10 | * |
11 | * asm/spinlock_types.h: contains the arch_spinlock_t/arch_rwlock_t and the |
12 | * initializers |
13 | * |
14 | * linux/spinlock_types.h: |
15 | * defines the generic type and initializers |
16 | * |
17 | * asm/spinlock.h: contains the arch_spin_*()/etc. lowlevel |
18 | * implementations, mostly inline assembly code |
19 | * |
20 | * (also included on UP-debug builds:) |
21 | * |
22 | * linux/spinlock_api_smp.h: |
23 | * contains the prototypes for the _spin_*() APIs. |
24 | * |
25 | * linux/spinlock.h: builds the final spin_*() APIs. |
26 | * |
27 | * on UP builds: |
28 | * |
29 | * linux/spinlock_type_up.h: |
30 | * contains the generic, simplified UP spinlock type. |
31 | * (which is an empty structure on non-debug builds) |
32 | * |
33 | * linux/spinlock_types.h: |
34 | * defines the generic type and initializers |
35 | * |
36 | * linux/spinlock_up.h: |
37 | * contains the arch_spin_*()/etc. version of UP |
38 | * builds. (which are NOPs on non-debug, non-preempt |
39 | * builds) |
40 | * |
41 | * (included on UP-non-debug builds:) |
42 | * |
43 | * linux/spinlock_api_up.h: |
44 | * builds the _spin_*() APIs. |
45 | * |
46 | * linux/spinlock.h: builds the final spin_*() APIs. |
47 | */ |
48 | |
49 | #include <linux/typecheck.h> |
50 | #include <linux/preempt.h> |
51 | #include <linux/linkage.h> |
52 | #include <linux/compiler.h> |
53 | #include <linux/irqflags.h> |
54 | #include <linux/thread_info.h> |
55 | #include <linux/kernel.h> |
56 | #include <linux/stringify.h> |
57 | #include <linux/bottom_half.h> |
58 | #include <asm/barrier.h> |
59 | |
60 | |
61 | /* |
62 | * Must define these before including other files, inline functions need them |
63 | */ |
64 | #define LOCK_SECTION_NAME ".text..lock."KBUILD_BASENAME |
65 | |
66 | #define LOCK_SECTION_START(extra) \ |
67 | ".subsection 1\n\t" \ |
68 | extra \ |
69 | ".ifndef " LOCK_SECTION_NAME "\n\t" \ |
70 | LOCK_SECTION_NAME ":\n\t" \ |
71 | ".endif\n" |
72 | |
73 | #define LOCK_SECTION_END \ |
74 | ".previous\n\t" |
75 | |
76 | #define __lockfunc __attribute__((section(".spinlock.text"))) |
77 | |
78 | /* |
79 | * Pull the arch_spinlock_t and arch_rwlock_t definitions: |
80 | */ |
81 | #include <linux/spinlock_types.h> |
82 | |
83 | /* |
84 | * Pull the arch_spin*() functions/declarations (UP-nondebug doesn't need them): |
85 | */ |
86 | #ifdef CONFIG_SMP |
87 | # include <asm/spinlock.h> |
88 | #else |
89 | # include <linux/spinlock_up.h> |
90 | #endif |
91 | |
92 | #ifdef CONFIG_DEBUG_SPINLOCK |
93 | extern void __raw_spin_lock_init(raw_spinlock_t *lock, const char *name, |
94 | struct lock_class_key *key); |
95 | # define raw_spin_lock_init(lock) \ |
96 | do { \ |
97 | static struct lock_class_key __key; \ |
98 | \ |
99 | __raw_spin_lock_init((lock), #lock, &__key); \ |
100 | } while (0) |
101 | |
102 | #else |
103 | # define raw_spin_lock_init(lock) \ |
104 | do { *(lock) = __RAW_SPIN_LOCK_UNLOCKED(lock); } while (0) |
105 | #endif |
106 | |
107 | #define raw_spin_is_locked(lock) arch_spin_is_locked(&(lock)->raw_lock) |
108 | |
109 | #ifdef CONFIG_GENERIC_LOCKBREAK |
110 | #define raw_spin_is_contended(lock) ((lock)->break_lock) |
111 | #else |
112 | |
113 | #ifdef arch_spin_is_contended |
114 | #define raw_spin_is_contended(lock) arch_spin_is_contended(&(lock)->raw_lock) |
115 | #else |
116 | #define raw_spin_is_contended(lock) (((void)(lock), 0)) |
117 | #endif /*arch_spin_is_contended*/ |
118 | #endif |
119 | |
120 | /* The lock does not imply full memory barrier. */ |
121 | #ifndef ARCH_HAS_SMP_MB_AFTER_LOCK |
122 | static inline void smp_mb__after_lock(void) { smp_mb(); } |
123 | #endif |
124 | |
125 | /** |
126 | * raw_spin_unlock_wait - wait until the spinlock gets unlocked |
127 | * @lock: the spinlock in question. |
128 | */ |
129 | #define raw_spin_unlock_wait(lock) arch_spin_unlock_wait(&(lock)->raw_lock) |
130 | |
131 | #ifdef CONFIG_DEBUG_SPINLOCK |
132 | extern void do_raw_spin_lock(raw_spinlock_t *lock) __acquires(lock); |
133 | #define do_raw_spin_lock_flags(lock, flags) do_raw_spin_lock(lock) |
134 | extern int do_raw_spin_trylock(raw_spinlock_t *lock); |
135 | extern void do_raw_spin_unlock(raw_spinlock_t *lock) __releases(lock); |
136 | #else |
137 | static inline void do_raw_spin_lock(raw_spinlock_t *lock) __acquires(lock) |
138 | { |
139 | __acquire(lock); |
140 | arch_spin_lock(&lock->raw_lock); |
141 | } |
142 | |
143 | static inline void |
144 | do_raw_spin_lock_flags(raw_spinlock_t *lock, unsigned long *flags) __acquires(lock) |
145 | { |
146 | __acquire(lock); |
147 | arch_spin_lock_flags(&lock->raw_lock, *flags); |
148 | } |
149 | |
150 | static inline int do_raw_spin_trylock(raw_spinlock_t *lock) |
151 | { |
152 | return arch_spin_trylock(&(lock)->raw_lock); |
153 | } |
154 | |
155 | static inline void do_raw_spin_unlock(raw_spinlock_t *lock) __releases(lock) |
156 | { |
157 | arch_spin_unlock(&lock->raw_lock); |
158 | __release(lock); |
159 | } |
160 | #endif |
161 | |
162 | /* |
163 | * Define the various spin_lock methods. Note we define these |
164 | * regardless of whether CONFIG_SMP or CONFIG_PREEMPT are set. The |
165 | * various methods are defined as nops in the case they are not |
166 | * required. |
167 | */ |
168 | #define raw_spin_trylock(lock) __cond_lock(lock, _raw_spin_trylock(lock)) |
169 | |
170 | #define raw_spin_lock(lock) _raw_spin_lock(lock) |
171 | |
172 | #ifdef CONFIG_DEBUG_LOCK_ALLOC |
173 | # define raw_spin_lock_nested(lock, subclass) \ |
174 | _raw_spin_lock_nested(lock, subclass) |
175 | |
176 | # define raw_spin_lock_nest_lock(lock, nest_lock) \ |
177 | do { \ |
178 | typecheck(struct lockdep_map *, &(nest_lock)->dep_map);\ |
179 | _raw_spin_lock_nest_lock(lock, &(nest_lock)->dep_map); \ |
180 | } while (0) |
181 | #else |
182 | # define raw_spin_lock_nested(lock, subclass) _raw_spin_lock(lock) |
183 | # define raw_spin_lock_nest_lock(lock, nest_lock) _raw_spin_lock(lock) |
184 | #endif |
185 | |
186 | #if defined(CONFIG_SMP) || defined(CONFIG_DEBUG_SPINLOCK) |
187 | |
188 | #define raw_spin_lock_irqsave(lock, flags) \ |
189 | do { \ |
190 | typecheck(unsigned long, flags); \ |
191 | flags = _raw_spin_lock_irqsave(lock); \ |
192 | } while (0) |
193 | |
194 | #ifdef CONFIG_DEBUG_LOCK_ALLOC |
195 | #define raw_spin_lock_irqsave_nested(lock, flags, subclass) \ |
196 | do { \ |
197 | typecheck(unsigned long, flags); \ |
198 | flags = _raw_spin_lock_irqsave_nested(lock, subclass); \ |
199 | } while (0) |
200 | #else |
201 | #define raw_spin_lock_irqsave_nested(lock, flags, subclass) \ |
202 | do { \ |
203 | typecheck(unsigned long, flags); \ |
204 | flags = _raw_spin_lock_irqsave(lock); \ |
205 | } while (0) |
206 | #endif |
207 | |
208 | #else |
209 | |
210 | #define raw_spin_lock_irqsave(lock, flags) \ |
211 | do { \ |
212 | typecheck(unsigned long, flags); \ |
213 | _raw_spin_lock_irqsave(lock, flags); \ |
214 | } while (0) |
215 | |
216 | #define raw_spin_lock_irqsave_nested(lock, flags, subclass) \ |
217 | raw_spin_lock_irqsave(lock, flags) |
218 | |
219 | #endif |
220 | |
221 | #define raw_spin_lock_irq(lock) _raw_spin_lock_irq(lock) |
222 | #define raw_spin_lock_bh(lock) _raw_spin_lock_bh(lock) |
223 | #define raw_spin_unlock(lock) _raw_spin_unlock(lock) |
224 | #define raw_spin_unlock_irq(lock) _raw_spin_unlock_irq(lock) |
225 | |
226 | #define raw_spin_unlock_irqrestore(lock, flags) \ |
227 | do { \ |
228 | typecheck(unsigned long, flags); \ |
229 | _raw_spin_unlock_irqrestore(lock, flags); \ |
230 | } while (0) |
231 | #define raw_spin_unlock_bh(lock) _raw_spin_unlock_bh(lock) |
232 | |
233 | #define raw_spin_trylock_bh(lock) \ |
234 | __cond_lock(lock, _raw_spin_trylock_bh(lock)) |
235 | |
236 | #define raw_spin_trylock_irq(lock) \ |
237 | ({ \ |
238 | local_irq_disable(); \ |
239 | raw_spin_trylock(lock) ? \ |
240 | 1 : ({ local_irq_enable(); 0; }); \ |
241 | }) |
242 | |
243 | #define raw_spin_trylock_irqsave(lock, flags) \ |
244 | ({ \ |
245 | local_irq_save(flags); \ |
246 | raw_spin_trylock(lock) ? \ |
247 | 1 : ({ local_irq_restore(flags); 0; }); \ |
248 | }) |
249 | |
250 | /** |
251 | * raw_spin_can_lock - would raw_spin_trylock() succeed? |
252 | * @lock: the spinlock in question. |
253 | */ |
254 | #define raw_spin_can_lock(lock) (!raw_spin_is_locked(lock)) |
255 | |
256 | /* Include rwlock functions */ |
257 | #include <linux/rwlock.h> |
258 | |
259 | /* |
260 | * Pull the _spin_*()/_read_*()/_write_*() functions/declarations: |
261 | */ |
262 | #if defined(CONFIG_SMP) || defined(CONFIG_DEBUG_SPINLOCK) |
263 | # include <linux/spinlock_api_smp.h> |
264 | #else |
265 | # include <linux/spinlock_api_up.h> |
266 | #endif |
267 | |
268 | /* |
269 | * Map the spin_lock functions to the raw variants for PREEMPT_RT=n |
270 | */ |
271 | |
272 | static inline raw_spinlock_t *spinlock_check(spinlock_t *lock) |
273 | { |
274 | return &lock->rlock; |
275 | } |
276 | |
277 | #define spin_lock_init(_lock) \ |
278 | do { \ |
279 | spinlock_check(_lock); \ |
280 | raw_spin_lock_init(&(_lock)->rlock); \ |
281 | } while (0) |
282 | |
283 | static inline void spin_lock(spinlock_t *lock) |
284 | { |
285 | raw_spin_lock(&lock->rlock); |
286 | } |
287 | |
288 | static inline void spin_lock_bh(spinlock_t *lock) |
289 | { |
290 | raw_spin_lock_bh(&lock->rlock); |
291 | } |
292 | |
293 | static inline int spin_trylock(spinlock_t *lock) |
294 | { |
295 | return raw_spin_trylock(&lock->rlock); |
296 | } |
297 | |
298 | #define spin_lock_nested(lock, subclass) \ |
299 | do { \ |
300 | raw_spin_lock_nested(spinlock_check(lock), subclass); \ |
301 | } while (0) |
302 | |
303 | #define spin_lock_nest_lock(lock, nest_lock) \ |
304 | do { \ |
305 | raw_spin_lock_nest_lock(spinlock_check(lock), nest_lock); \ |
306 | } while (0) |
307 | |
308 | static inline void spin_lock_irq(spinlock_t *lock) |
309 | { |
310 | raw_spin_lock_irq(&lock->rlock); |
311 | } |
312 | |
313 | #define spin_lock_irqsave(lock, flags) \ |
314 | do { \ |
315 | raw_spin_lock_irqsave(spinlock_check(lock), flags); \ |
316 | } while (0) |
317 | |
318 | #define spin_lock_irqsave_nested(lock, flags, subclass) \ |
319 | do { \ |
320 | raw_spin_lock_irqsave_nested(spinlock_check(lock), flags, subclass); \ |
321 | } while (0) |
322 | |
323 | static inline void spin_unlock(spinlock_t *lock) |
324 | { |
325 | raw_spin_unlock(&lock->rlock); |
326 | } |
327 | |
328 | static inline void spin_unlock_bh(spinlock_t *lock) |
329 | { |
330 | raw_spin_unlock_bh(&lock->rlock); |
331 | } |
332 | |
333 | static inline void spin_unlock_irq(spinlock_t *lock) |
334 | { |
335 | raw_spin_unlock_irq(&lock->rlock); |
336 | } |
337 | |
338 | static inline void spin_unlock_irqrestore(spinlock_t *lock, unsigned long flags) |
339 | { |
340 | raw_spin_unlock_irqrestore(&lock->rlock, flags); |
341 | } |
342 | |
343 | static inline int spin_trylock_bh(spinlock_t *lock) |
344 | { |
345 | return raw_spin_trylock_bh(&lock->rlock); |
346 | } |
347 | |
348 | static inline int spin_trylock_irq(spinlock_t *lock) |
349 | { |
350 | return raw_spin_trylock_irq(&lock->rlock); |
351 | } |
352 | |
353 | #define spin_trylock_irqsave(lock, flags) \ |
354 | ({ \ |
355 | raw_spin_trylock_irqsave(spinlock_check(lock), flags); \ |
356 | }) |
357 | |
358 | static inline void spin_unlock_wait(spinlock_t *lock) |
359 | { |
360 | raw_spin_unlock_wait(&lock->rlock); |
361 | } |
362 | |
363 | static inline int spin_is_locked(spinlock_t *lock) |
364 | { |
365 | return raw_spin_is_locked(&lock->rlock); |
366 | } |
367 | |
368 | static inline int spin_is_contended(spinlock_t *lock) |
369 | { |
370 | return raw_spin_is_contended(&lock->rlock); |
371 | } |
372 | |
373 | static inline int spin_can_lock(spinlock_t *lock) |
374 | { |
375 | return raw_spin_can_lock(&lock->rlock); |
376 | } |
377 | |
378 | #define assert_spin_locked(lock) assert_raw_spin_locked(&(lock)->rlock) |
379 | |
380 | /* |
381 | * Pull the atomic_t declaration: |
382 | * (asm-mips/atomic.h needs above definitions) |
383 | */ |
384 | #include <linux/atomic.h> |
385 | /** |
386 | * atomic_dec_and_lock - lock on reaching reference count zero |
387 | * @atomic: the atomic counter |
388 | * @lock: the spinlock in question |
389 | * |
390 | * Decrements @atomic by 1. If the result is 0, returns true and locks |
391 | * @lock. Returns false for all other cases. |
392 | */ |
393 | extern int _atomic_dec_and_lock(atomic_t *atomic, spinlock_t *lock); |
394 | #define atomic_dec_and_lock(atomic, lock) \ |
395 | __cond_lock(lock, _atomic_dec_and_lock(atomic, lock)) |
396 | |
397 | #endif /* __LINUX_SPINLOCK_H */ |
398 |
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