48 void ttm_lock_init(struct ttm_lock *lock)  in ttm_lock_init()  argument
50 	mtx_init(&lock->lock, "ttmlk", NULL, MTX_DEF);  in ttm_lock_init()
51 	lock->rw = 0;  in ttm_lock_init()
52 	lock->flags = 0;  in ttm_lock_init()
53 	lock->kill_takers = false;  in ttm_lock_init()
54 	lock->signal = SIGKILL;  in ttm_lock_init()
68 void ttm_read_unlock(struct ttm_lock *lock)  in ttm_read_unlock()  argument
70 	mtx_lock(&lock->lock);  in ttm_read_unlock()
71 	if (--lock->rw == 0)  in ttm_read_unlock()
72 		wakeup(lock);  in ttm_read_unlock()
73 	mtx_unlock(&lock->lock);  in ttm_read_unlock()
76 static bool __ttm_read_lock(struct ttm_lock *lock)  in __ttm_read_lock()  argument
80 	if (unlikely(lock->kill_takers)) {  in __ttm_read_lock()
81 		ttm_lock_send_sig(lock->signal);  in __ttm_read_lock()
84 	if (lock->rw >= 0 && lock->flags == 0) {  in __ttm_read_lock()
85 		++lock->rw;  in __ttm_read_lock()
92 ttm_read_lock(struct ttm_lock *lock, bool interruptible)  in ttm_read_lock()  argument
105 	mtx_lock(&lock->lock);  in ttm_read_lock()
106 	while (!__ttm_read_lock(lock)) {  in ttm_read_lock()
107 		ret = -msleep(lock, &lock->lock, flags, wmsg, 0);  in ttm_read_lock()
116 static bool __ttm_read_trylock(struct ttm_lock *lock, bool *locked)  in __ttm_read_trylock()  argument
122 	if (unlikely(lock->kill_takers)) {  in __ttm_read_trylock()
123 		ttm_lock_send_sig(lock->signal);  in __ttm_read_trylock()
126 	if (lock->rw >= 0 && lock->flags == 0) {  in __ttm_read_trylock()
127 		++lock->rw;  in __ttm_read_trylock()
130 	} else if (lock->flags == 0) {  in __ttm_read_trylock()
137 int ttm_read_trylock(struct ttm_lock *lock, bool interruptible)  in ttm_read_trylock()  argument
151 	mtx_lock(&lock->lock);  in ttm_read_trylock()
152 	while (!__ttm_read_trylock(lock, &locked)) {  in ttm_read_trylock()
153 		ret = -msleep(lock, &lock->lock, flags, wmsg, 0);  in ttm_read_trylock()
160 	mtx_unlock(&lock->lock);  in ttm_read_trylock()
165 void ttm_write_unlock(struct ttm_lock *lock)  in ttm_write_unlock()  argument
167 	mtx_lock(&lock->lock);  in ttm_write_unlock()
168 	lock->rw = 0;  in ttm_write_unlock()
169 	wakeup(lock);  in ttm_write_unlock()
170 	mtx_unlock(&lock->lock);  in ttm_write_unlock()
173 static bool __ttm_write_lock(struct ttm_lock *lock)  in __ttm_write_lock()  argument
177 	if (unlikely(lock->kill_takers)) {  in __ttm_write_lock()
178 		ttm_lock_send_sig(lock->signal);  in __ttm_write_lock()
181 	if (lock->rw == 0 && ((lock->flags & ~TTM_WRITE_LOCK_PENDING) == 0)) {  in __ttm_write_lock()
182 		lock->rw = -1;  in __ttm_write_lock()
183 		lock->flags &= ~TTM_WRITE_LOCK_PENDING;  in __ttm_write_lock()
186 		lock->flags |= TTM_WRITE_LOCK_PENDING;  in __ttm_write_lock()
192 ttm_write_lock(struct ttm_lock *lock, bool interruptible)  in ttm_write_lock()  argument
205 	mtx_lock(&lock->lock);  in ttm_write_lock()
207 	while (!__ttm_write_lock(lock)) {  in ttm_write_lock()
208 		ret = -msleep(lock, &lock->lock, flags, wmsg, 0);  in ttm_write_lock()
212 			lock->flags &= ~TTM_WRITE_LOCK_PENDING;  in ttm_write_lock()
213 			wakeup(lock);  in ttm_write_lock()
217 	mtx_unlock(&lock->lock);  in ttm_write_lock()
222 void ttm_write_lock_downgrade(struct ttm_lock *lock)  in ttm_write_lock_downgrade()  argument
224 	mtx_lock(&lock->lock);  in ttm_write_lock_downgrade()
225 	lock->rw = 1;  in ttm_write_lock_downgrade()
226 	wakeup(lock);  in ttm_write_lock_downgrade()
227 	mtx_unlock(&lock->lock);  in ttm_write_lock_downgrade()
230 static int __ttm_vt_unlock(struct ttm_lock *lock)  in __ttm_vt_unlock()  argument
234 	mtx_lock(&lock->lock);  in __ttm_vt_unlock()
235 	if (unlikely(!(lock->flags & TTM_VT_LOCK)))  in __ttm_vt_unlock()
237 	lock->flags &= ~TTM_VT_LOCK;  in __ttm_vt_unlock()
238 	wakeup(lock);  in __ttm_vt_unlock()
239 	mtx_unlock(&lock->lock);  in __ttm_vt_unlock()
247 	struct ttm_lock *lock = container_of(base, struct ttm_lock, base);  in ttm_vt_lock_remove()  local
251 	ret = __ttm_vt_unlock(lock);  in ttm_vt_lock_remove()
255 static bool __ttm_vt_lock(struct ttm_lock *lock)  in __ttm_vt_lock()  argument
259 	if (lock->rw == 0) {  in __ttm_vt_lock()
260 		lock->flags &= ~TTM_VT_LOCK_PENDING;  in __ttm_vt_lock()
261 		lock->flags |= TTM_VT_LOCK;  in __ttm_vt_lock()
264 		lock->flags |= TTM_VT_LOCK_PENDING;  in __ttm_vt_lock()
269 int ttm_vt_lock(struct ttm_lock *lock,  in ttm_vt_lock()  argument
284 	mtx_lock(&lock->lock);  in ttm_vt_lock()
285 	while (!__ttm_vt_lock(lock)) {  in ttm_vt_lock()
286 		ret = -msleep(lock, &lock->lock, flags, wmsg, 0);  in ttm_vt_lock()
290 			lock->flags &= ~TTM_VT_LOCK_PENDING;  in ttm_vt_lock()
291 			wakeup(lock);  in ttm_vt_lock()
302 	ret = ttm_base_object_init(tfile, &lock->base, false,  in ttm_vt_lock()
305 		(void)__ttm_vt_unlock(lock);  in ttm_vt_lock()
307 		lock->vt_holder = tfile;  in ttm_vt_lock()
312 int ttm_vt_unlock(struct ttm_lock *lock)  in ttm_vt_unlock()  argument
314 	return ttm_ref_object_base_unref(lock->vt_holder,  in ttm_vt_unlock()
315 					 lock->base.hash.key, TTM_REF_USAGE);  in ttm_vt_unlock()
318 void ttm_suspend_unlock(struct ttm_lock *lock)  in ttm_suspend_unlock()  argument
320 	mtx_lock(&lock->lock);  in ttm_suspend_unlock()
321 	lock->flags &= ~TTM_SUSPEND_LOCK;  in ttm_suspend_unlock()
322 	wakeup(lock);  in ttm_suspend_unlock()
323 	mtx_unlock(&lock->lock);  in ttm_suspend_unlock()
326 static bool __ttm_suspend_lock(struct ttm_lock *lock)  in __ttm_suspend_lock()  argument
330 	if (lock->rw == 0) {  in __ttm_suspend_lock()
331 		lock->flags &= ~TTM_SUSPEND_LOCK_PENDING;  in __ttm_suspend_lock()
332 		lock->flags |= TTM_SUSPEND_LOCK;  in __ttm_suspend_lock()
335 		lock->flags |= TTM_SUSPEND_LOCK_PENDING;  in __ttm_suspend_lock()
340 void ttm_suspend_lock(struct ttm_lock *lock)  in ttm_suspend_lock()  argument
342 	mtx_lock(&lock->lock);  in ttm_suspend_lock()
343 	while (!__ttm_suspend_lock(lock))  in ttm_suspend_lock()
344 		msleep(lock, &lock->lock, 0, "ttms", 0);  in ttm_suspend_lock()
345 	mtx_unlock(&lock->lock);  in ttm_suspend_lock()