/* * Copyright © 2017 Red Hat * * Permission is hereby granted, free of charge, to any person obtaining a * copy of this software and associated documentation files (the "Software"), * to deal in the Software without restriction, including without limitation * the rights to use, copy, modify, merge, publish, distribute, sublicense, * and/or sell copies of the Software, and to permit persons to whom the * Software is furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice (including the next * paragraph) shall be included in all copies or substantial portions of the * Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS * IN THE SOFTWARE. * * Authors: * */#ifndef __DRM_SYNCOBJ_H__#define __DRM_SYNCOBJ_H__ #include "linux/dma-fence.h" struct drm_syncobj_cb; /** * struct drm_syncobj - sync object. * * This structure defines a generic sync object which wraps a &dma_fence. */struct drm_syncobj {	/**	 * @refcount: Reference count of this object.	 */	struct kref refcount;	/**	 * @fence:	 * NULL or a pointer to the fence bound to this object.	 *	 * This field should not be used directly. Use drm_syncobj_fence_get()	 * and drm_syncobj_replace_fence() instead.	 */	struct dma_fence __rcu *fence;	/**	 * @cb_list: List of callbacks to call when the &fence gets replaced.	 */	struct list_head cb_list;	/**	 * @lock: Protects &cb_list and write-locks &fence.	 */	spinlock_t lock;	/**	 * @file: A file backing for this syncobj.	 */	struct file *file;}; typedef void (*drm_syncobj_func_t)(struct drm_syncobj *syncobj,				   struct drm_syncobj_cb *cb); /** * struct drm_syncobj_cb - callback for drm_syncobj_add_callback * @node: used by drm_syncob_add_callback to append this struct to *	  &drm_syncobj.cb_list * @func: drm_syncobj_func_t to call * * This struct will be initialized by drm_syncobj_add_callback, additional * data can be passed along by embedding drm_syncobj_cb in another struct. * The callback will get called the next time drm_syncobj_replace_fence is * called. */struct drm_syncobj_cb {	struct list_head node;	drm_syncobj_func_t func;}; void drm_syncobj_free(struct kref *kref); /** * drm_syncobj_get - acquire a syncobj reference * @obj: sync object * * This acquires an additional reference to @obj. It is illegal to call this * without already holding a reference. No locks required. */static inline voiddrm_syncobj_get(struct drm_syncobj *obj){	kref_get(&obj->refcount);} /** * drm_syncobj_put - release a reference to a sync object. * @obj: sync object. */static inline voiddrm_syncobj_put(struct drm_syncobj *obj){	kref_put(&obj->refcount, drm_syncobj_free);} /** * drm_syncobj_fence_get - get a reference to a fence in a sync object * @syncobj: sync object. * * This acquires additional reference to &drm_syncobj.fence contained in @obj, * if not NULL. It is illegal to call this without already holding a reference. * No locks required. * * Returns: * Either the fence of @obj or NULL if there's none. */static inline struct dma_fence *drm_syncobj_fence_get(struct drm_syncobj *syncobj){	struct dma_fence *fence; 	rcu_read_lock();	fence = dma_fence_get_rcu_safe(&syncobj->fence);	rcu_read_unlock(); 	return fence;} struct drm_syncobj *drm_syncobj_find(struct drm_file *file_private,				     u32 handle);void drm_syncobj_replace_fence(struct drm_syncobj *syncobj, u64 point,			       struct dma_fence *fence);int drm_syncobj_find_fence(struct drm_file *file_private,			   u32 handle, u64 point,			   struct dma_fence **fence);void drm_syncobj_free(struct kref *kref);int drm_syncobj_create(struct drm_syncobj **out_syncobj, uint32_t flags,		       struct dma_fence *fence);int drm_syncobj_get_handle(struct drm_file *file_private,			   struct drm_syncobj *syncobj, u32 *handle);int drm_syncobj_get_fd(struct drm_syncobj *syncobj, int *p_fd); #endif