include/drm/drm_modeset_lock.h

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27 #include <linux/types.h> /* stackdepot.h is not self-contained */
34  * struct drm_modeset_acquire_ctx - locking context (see ww_acquire_ctx)
36  * @contended: used internally for -EDEADLK handling
38  * @locked: list of held locks
43  * ctx.  And if any lock fxn returns -EDEADLK, it must backoff and
52 	 * drm_modeset_backoff() which drops locks and slow-locks the
66 	struct list_head locked;  member
78  * struct drm_modeset_lock - used for locking modeset resources.
80  * @head: used to hold its place on &drm_atomi_state.locked list when
92 	 * Resources that are locked as part of an atomic update are added
109  * drm_modeset_lock_fini - cleanup lock
114 	WARN_ON(!list_empty(&lock->head));  in drm_modeset_lock_fini()
118  * drm_modeset_is_locked - equivalent to mutex_is_locked()
123 	return ww_mutex_is_locked(&lock->mutex);  in drm_modeset_is_locked()
127  * drm_modeset_lock_assert_held - equivalent to lockdep_assert_held()
132 	lockdep_assert_held(&lock->mutex.base);  in drm_modeset_lock_assert_held()
152  * DRM_MODESET_LOCK_ALL_BEGIN - Helper to acquire modeset locks
177 		mutex_lock(&dev->mode_config.mutex);			\
185  * DRM_MODESET_LOCK_ALL_END - Helper to release and cleanup modeset locks
191  * if ret is -EDEADLK.
197  * ret will be untouched unless it is -EDEADLK on entry. That means that if you
205 	if (ret == -EDEADLK) {						\
213 		mutex_unlock(&dev->mode_config.mutex);