46  * Take the heavyweight lock.
48  * \param lock lock pointer.
50  * \return one if the lock is held, or zero otherwise.
52  * Attempt to mark the lock as held by the given context, via the \p cmpxchg instruction.
59 	volatile unsigned int *lock = &lock_data->hw_lock->lock;  in drm_lock_take()  local
63 		old = *lock;  in drm_lock_take()
71 		prev = cmpxchg(lock, old, new);  in drm_lock_take()
78 				DRM_ERROR("%d holds heavyweight lock\n",  in drm_lock_take()
86 		/* Have lock */  in drm_lock_take()
93  * This takes a lock forcibly and hands it to context.	Should ONLY be used
94  * inside *_unlock to give lock to kernel before calling *_dma_schedule.
97  * \param lock lock pointer.
101  * Resets the lock file pointer.
102  * Marks the lock as held by the given context, via the \p cmpxchg instruction.
108 	volatile unsigned int *lock = &lock_data->hw_lock->lock;  in drm_lock_transfer()  local
112 		old = *lock;  in drm_lock_transfer()
114 		prev = cmpxchg(lock, old, new);  in drm_lock_transfer()
123 	volatile unsigned int *lock = &lock_data->hw_lock->lock;  in drm_legacy_lock_free()  local
135 		old = *lock;  in drm_legacy_lock_free()
137 		prev = cmpxchg(lock, old, new);  in drm_legacy_lock_free()
141 		DRM_ERROR("%d freed heavyweight lock held by %d\n",  in drm_legacy_lock_free()
150  * Lock ioctl.
158  * Add the current task to the lock wait queue, and attempt to take to lock.
164 	struct drm_lock *lock = data;  in drm_legacy_lock()  local
173 	if (lock->context == DRM_KERNEL_CONTEXT) {  in drm_legacy_lock()
175 			  task_pid_nr(current), lock->context);  in drm_legacy_lock()
179 	DRM_DEBUG("%d (pid %d) requests lock (0x%08x), flags = 0x%08x\n",  in drm_legacy_lock()
180 		  lock->context, task_pid_nr(current),  in drm_legacy_lock()
181 		  master->lock.hw_lock ? master->lock.hw_lock->lock : -1,  in drm_legacy_lock()
182 		  lock->flags);  in drm_legacy_lock()
184 	add_wait_queue(&master->lock.lock_queue, &entry);  in drm_legacy_lock()
185 	spin_lock_bh(&master->lock.spinlock);  in drm_legacy_lock()
186 	master->lock.user_waiters++;  in drm_legacy_lock()
187 	spin_unlock_bh(&master->lock.spinlock);  in drm_legacy_lock()
191 		if (!master->lock.hw_lock) {  in drm_legacy_lock()
197 		if (drm_lock_take(&master->lock, lock->context)) {  in drm_legacy_lock()
198 			master->lock.file_priv = file_priv;  in drm_legacy_lock()
199 			master->lock.lock_time = jiffies;  in drm_legacy_lock()
200 			break;	/* Got lock */  in drm_legacy_lock()
212 	spin_lock_bh(&master->lock.spinlock);  in drm_legacy_lock()
213 	master->lock.user_waiters--;  in drm_legacy_lock()
214 	spin_unlock_bh(&master->lock.spinlock);  in drm_legacy_lock()
216 	remove_wait_queue(&master->lock.lock_queue, &entry);  in drm_legacy_lock()
218 	DRM_DEBUG("%d %s\n", lock->context,  in drm_legacy_lock()
219 		  ret ? "interrupted" : "has lock");  in drm_legacy_lock()
226 		dev->sigdata.context = lock->context;  in drm_legacy_lock()
227 		dev->sigdata.lock = master->lock.hw_lock;  in drm_legacy_lock()
230 	if (dev->driver->dma_quiescent && (lock->flags & _DRM_LOCK_QUIESCENT))  in drm_legacy_lock()
234 				  lock->context);  in drm_legacy_lock()
251  * Transfer and free the lock.
255 	struct drm_lock *lock = data;  in drm_legacy_unlock()  local
261 	if (lock->context == DRM_KERNEL_CONTEXT) {  in drm_legacy_unlock()
263 			  task_pid_nr(current), lock->context);  in drm_legacy_unlock()
267 	if (drm_legacy_lock_free(&master->lock, lock->context)) {  in drm_legacy_unlock()
275  * This function returns immediately and takes the hw lock
279  * This guarantees that the kernel will _eventually_ have the lock _unless_ it is held
280  * by a blocked process. (In the latter case an explicit wait for the hardware lock would cause
309 	volatile unsigned int *lock = &lock_data->hw_lock->lock;  in drm_legacy_idlelock_release()  local
315 				old = *lock;  in drm_legacy_idlelock_release()
316 				prev = cmpxchg(lock, old, DRM_KERNEL_CONTEXT);  in drm_legacy_idlelock_release()
330 	return (file_priv->lock_count && master->lock.hw_lock &&  in drm_legacy_i_have_hw_lock()
331 		_DRM_LOCK_IS_HELD(master->lock.hw_lock->lock) &&  in drm_legacy_i_have_hw_lock()
332 		master->lock.file_priv == file_priv);  in drm_legacy_i_have_hw_lock()
339 	/* if the master has gone away we can't do anything with the lock */  in drm_legacy_lock_release()
344 		DRM_DEBUG("File %p released, freeing lock for context %d\n",  in drm_legacy_lock_release()
345 			  filp, _DRM_LOCKING_CONTEXT(file_priv->master->lock.hw_lock->lock));  in drm_legacy_lock_release()
346 		drm_legacy_lock_free(&file_priv->master->lock,  in drm_legacy_lock_release()
347 				     _DRM_LOCKING_CONTEXT(file_priv->master->lock.hw_lock->lock));  in drm_legacy_lock_release()