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1/*2 * Copyright © 2017 Red Hat3 *4 * Permission is hereby granted, free of charge, to any person obtaining a5 * copy of this software and associated documentation files (the "Software"),6 * to deal in the Software without restriction, including without limitation7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,8 * and/or sell copies of the Software, and to permit persons to whom the9 * Software is furnished to do so, subject to the following conditions:10 *11 * The above copyright notice and this permission notice (including the next12 * paragraph) shall be included in all copies or substantial portions of the13 * Software.14 *15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS21 * IN THE SOFTWARE.22 *23 * Authors:24 *25 */26#ifndef __DRM_SYNCOBJ_H__27#define __DRM_SYNCOBJ_H__28 29#include <linux/dma-fence.h>30#include <linux/dma-fence-chain.h>31 32struct drm_file;33 34/**35 * struct drm_syncobj - sync object.36 *37 * This structure defines a generic sync object which wraps a &dma_fence.38 */39struct drm_syncobj {40 /**41 * @refcount: Reference count of this object.42 */43 struct kref refcount;44 /**45 * @fence:46 * NULL or a pointer to the fence bound to this object.47 *48 * This field should not be used directly. Use drm_syncobj_fence_get()49 * and drm_syncobj_replace_fence() instead.50 */51 struct dma_fence __rcu *fence;52 /**53 * @cb_list: List of callbacks to call when the &fence gets replaced.54 */55 struct list_head cb_list;56 /**57 * @ev_fd_list: List of registered eventfd.58 */59 struct list_head ev_fd_list;60 /**61 * @lock: Protects &cb_list and &ev_fd_list, and write-locks &fence.62 */63 spinlock_t lock;64 /**65 * @file: A file backing for this syncobj.66 */67 struct file *file;68};69 70void drm_syncobj_free(struct kref *kref);71 72/**73 * drm_syncobj_get - acquire a syncobj reference74 * @obj: sync object75 *76 * This acquires an additional reference to @obj. It is illegal to call this77 * without already holding a reference. No locks required.78 */79static inline void80drm_syncobj_get(struct drm_syncobj *obj)81{82 kref_get(&obj->refcount);83}84 85/**86 * drm_syncobj_put - release a reference to a sync object.87 * @obj: sync object.88 */89static inline void90drm_syncobj_put(struct drm_syncobj *obj)91{92 kref_put(&obj->refcount, drm_syncobj_free);93}94 95/**96 * drm_syncobj_fence_get - get a reference to a fence in a sync object97 * @syncobj: sync object.98 *99 * This acquires additional reference to &drm_syncobj.fence contained in @obj,100 * if not NULL. It is illegal to call this without already holding a reference.101 * No locks required.102 *103 * Returns:104 * Either the fence of @obj or NULL if there's none.105 */106static inline struct dma_fence *107drm_syncobj_fence_get(struct drm_syncobj *syncobj)108{109 struct dma_fence *fence;110 111 rcu_read_lock();112 fence = dma_fence_get_rcu_safe(&syncobj->fence);113 rcu_read_unlock();114 115 return fence;116}117 118struct drm_syncobj *drm_syncobj_find(struct drm_file *file_private,119 u32 handle);120void drm_syncobj_add_point(struct drm_syncobj *syncobj,121 struct dma_fence_chain *chain,122 struct dma_fence *fence,123 uint64_t point);124void drm_syncobj_replace_fence(struct drm_syncobj *syncobj,125 struct dma_fence *fence);126int drm_syncobj_find_fence(struct drm_file *file_private,127 u32 handle, u64 point, u64 flags,128 struct dma_fence **fence);129void drm_syncobj_free(struct kref *kref);130int drm_syncobj_create(struct drm_syncobj **out_syncobj, uint32_t flags,131 struct dma_fence *fence);132int drm_syncobj_get_handle(struct drm_file *file_private,133 struct drm_syncobj *syncobj, u32 *handle);134int drm_syncobj_get_fd(struct drm_syncobj *syncobj, int *p_fd);135 136#endif137