46 void ttm_lock_init(struct ttm_lock *lock)  in ttm_lock_init()  argument
48 	spin_lock_init(&lock->lock);  in ttm_lock_init()
49 	init_waitqueue_head(&lock->queue);  in ttm_lock_init()
50 	lock->rw = 0;  in ttm_lock_init()
51 	lock->flags = 0;  in ttm_lock_init()
52 	lock->kill_takers = false;  in ttm_lock_init()
53 	lock->signal = SIGKILL;  in ttm_lock_init()
57 void ttm_read_unlock(struct ttm_lock *lock)  in ttm_read_unlock()  argument
59 	spin_lock(&lock->lock);  in ttm_read_unlock()
60 	if (--lock->rw == 0)  in ttm_read_unlock()
61 		wake_up_all(&lock->queue);  in ttm_read_unlock()
62 	spin_unlock(&lock->lock);  in ttm_read_unlock()
66 static bool __ttm_read_lock(struct ttm_lock *lock)  in __ttm_read_lock()  argument
70 	spin_lock(&lock->lock);  in __ttm_read_lock()
71 	if (unlikely(lock->kill_takers)) {  in __ttm_read_lock()
72 		send_sig(lock->signal, current, 0);  in __ttm_read_lock()
73 		spin_unlock(&lock->lock);  in __ttm_read_lock()
76 	if (lock->rw >= 0 && lock->flags == 0) {  in __ttm_read_lock()
77 		++lock->rw;  in __ttm_read_lock()
80 	spin_unlock(&lock->lock);  in __ttm_read_lock()
84 int ttm_read_lock(struct ttm_lock *lock, bool interruptible)  in ttm_read_lock()  argument
89 		ret = wait_event_interruptible(lock->queue,  in ttm_read_lock()
90 					       __ttm_read_lock(lock));  in ttm_read_lock()
92 		wait_event(lock->queue, __ttm_read_lock(lock));  in ttm_read_lock()
97 static bool __ttm_read_trylock(struct ttm_lock *lock, bool *locked)  in __ttm_read_trylock()  argument
103 	spin_lock(&lock->lock);  in __ttm_read_trylock()
104 	if (unlikely(lock->kill_takers)) {  in __ttm_read_trylock()
105 		send_sig(lock->signal, current, 0);  in __ttm_read_trylock()
106 		spin_unlock(&lock->lock);  in __ttm_read_trylock()
109 	if (lock->rw >= 0 && lock->flags == 0) {  in __ttm_read_trylock()
110 		++lock->rw;  in __ttm_read_trylock()
113 	} else if (lock->flags == 0) {  in __ttm_read_trylock()
116 	spin_unlock(&lock->lock);  in __ttm_read_trylock()
121 int ttm_read_trylock(struct ttm_lock *lock, bool interruptible)  in ttm_read_trylock()  argument
128 			(lock->queue, __ttm_read_trylock(lock, &locked));  in ttm_read_trylock()
130 		wait_event(lock->queue, __ttm_read_trylock(lock, &locked));  in ttm_read_trylock()
140 void ttm_write_unlock(struct ttm_lock *lock)  in ttm_write_unlock()  argument
142 	spin_lock(&lock->lock);  in ttm_write_unlock()
143 	lock->rw = 0;  in ttm_write_unlock()
144 	wake_up_all(&lock->queue);  in ttm_write_unlock()
145 	spin_unlock(&lock->lock);  in ttm_write_unlock()
149 static bool __ttm_write_lock(struct ttm_lock *lock)  in __ttm_write_lock()  argument
153 	spin_lock(&lock->lock);  in __ttm_write_lock()
154 	if (unlikely(lock->kill_takers)) {  in __ttm_write_lock()
155 		send_sig(lock->signal, current, 0);  in __ttm_write_lock()
156 		spin_unlock(&lock->lock);  in __ttm_write_lock()
159 	if (lock->rw == 0 && ((lock->flags & ~TTM_WRITE_LOCK_PENDING) == 0)) {  in __ttm_write_lock()
160 		lock->rw = -1;  in __ttm_write_lock()
161 		lock->flags &= ~TTM_WRITE_LOCK_PENDING;  in __ttm_write_lock()
164 		lock->flags |= TTM_WRITE_LOCK_PENDING;  in __ttm_write_lock()
166 	spin_unlock(&lock->lock);  in __ttm_write_lock()
170 int ttm_write_lock(struct ttm_lock *lock, bool interruptible)  in ttm_write_lock()  argument
175 		ret = wait_event_interruptible(lock->queue,  in ttm_write_lock()
176 					       __ttm_write_lock(lock));  in ttm_write_lock()
178 			spin_lock(&lock->lock);  in ttm_write_lock()
179 			lock->flags &= ~TTM_WRITE_LOCK_PENDING;  in ttm_write_lock()
180 			wake_up_all(&lock->queue);  in ttm_write_lock()
181 			spin_unlock(&lock->lock);  in ttm_write_lock()
184 		wait_event(lock->queue, __ttm_write_lock(lock));  in ttm_write_lock()
190 static int __ttm_vt_unlock(struct ttm_lock *lock)  in __ttm_vt_unlock()  argument
194 	spin_lock(&lock->lock);  in __ttm_vt_unlock()
195 	if (unlikely(!(lock->flags & TTM_VT_LOCK)))  in __ttm_vt_unlock()
197 	lock->flags &= ~TTM_VT_LOCK;  in __ttm_vt_unlock()
198 	wake_up_all(&lock->queue);  in __ttm_vt_unlock()
199 	spin_unlock(&lock->lock);  in __ttm_vt_unlock()
207 	struct ttm_lock *lock = container_of(base, struct ttm_lock, base);  in ttm_vt_lock_remove()  local
211 	ret = __ttm_vt_unlock(lock);  in ttm_vt_lock_remove()
215 static bool __ttm_vt_lock(struct ttm_lock *lock)  in __ttm_vt_lock()  argument
219 	spin_lock(&lock->lock);  in __ttm_vt_lock()
220 	if (lock->rw == 0) {  in __ttm_vt_lock()
221 		lock->flags &= ~TTM_VT_LOCK_PENDING;  in __ttm_vt_lock()
222 		lock->flags |= TTM_VT_LOCK;  in __ttm_vt_lock()
225 		lock->flags |= TTM_VT_LOCK_PENDING;  in __ttm_vt_lock()
227 	spin_unlock(&lock->lock);  in __ttm_vt_lock()
231 int ttm_vt_lock(struct ttm_lock *lock,  in ttm_vt_lock()  argument
238 		ret = wait_event_interruptible(lock->queue,  in ttm_vt_lock()
239 					       __ttm_vt_lock(lock));  in ttm_vt_lock()
241 			spin_lock(&lock->lock);  in ttm_vt_lock()
242 			lock->flags &= ~TTM_VT_LOCK_PENDING;  in ttm_vt_lock()
243 			wake_up_all(&lock->queue);  in ttm_vt_lock()
244 			spin_unlock(&lock->lock);  in ttm_vt_lock()
248 		wait_event(lock->queue, __ttm_vt_lock(lock));  in ttm_vt_lock()
252 	 * make sure the lock is released if the client dies  in ttm_vt_lock()
256 	ret = ttm_base_object_init(tfile, &lock->base, false,  in ttm_vt_lock()
259 		(void)__ttm_vt_unlock(lock);  in ttm_vt_lock()
261 		lock->vt_holder = tfile;  in ttm_vt_lock()
267 int ttm_vt_unlock(struct ttm_lock *lock)  in ttm_vt_unlock()  argument
269 	return ttm_ref_object_base_unref(lock->vt_holder,  in ttm_vt_unlock()
270 					 lock->base.hash.key, TTM_REF_USAGE);  in ttm_vt_unlock()
274 void ttm_suspend_unlock(struct ttm_lock *lock)  in ttm_suspend_unlock()  argument
276 	spin_lock(&lock->lock);  in ttm_suspend_unlock()
277 	lock->flags &= ~TTM_SUSPEND_LOCK;  in ttm_suspend_unlock()
278 	wake_up_all(&lock->queue);  in ttm_suspend_unlock()
279 	spin_unlock(&lock->lock);  in ttm_suspend_unlock()
283 static bool __ttm_suspend_lock(struct ttm_lock *lock)  in __ttm_suspend_lock()  argument
287 	spin_lock(&lock->lock);  in __ttm_suspend_lock()
288 	if (lock->rw == 0) {  in __ttm_suspend_lock()
289 		lock->flags &= ~TTM_SUSPEND_LOCK_PENDING;  in __ttm_suspend_lock()
290 		lock->flags |= TTM_SUSPEND_LOCK;  in __ttm_suspend_lock()
293 		lock->flags |= TTM_SUSPEND_LOCK_PENDING;  in __ttm_suspend_lock()
295 	spin_unlock(&lock->lock);  in __ttm_suspend_lock()
299 void ttm_suspend_lock(struct ttm_lock *lock)  in ttm_suspend_lock()  argument
301 	wait_event(lock->queue, __ttm_suspend_lock(lock));  in ttm_suspend_lock()