1 /* 2 * Copyright © 2017 Red Hat 3 * 4 * Permission is hereby granted, free of charge, to any person obtaining a 5 * copy of this software and associated documentation files (the "Software"), 6 * to deal in the Software without restriction, including without limitation 7 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 8 * and/or sell copies of the Software, and to permit persons to whom the 9 * Software is furnished to do so, subject to the following conditions: 10 * 11 * The above copyright notice and this permission notice (including the next 12 * paragraph) shall be included in all copies or substantial portions of the 13 * Software. 14 * 15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS 21 * 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 31 /** 32 * struct drm_syncobj - sync object. 33 * 34 * This structure defines a generic sync object which wraps a dma fence. 35 */ 36 struct drm_syncobj { 37 /** 38 * @refcount: 39 * 40 * Reference count of this object. 41 */ 42 struct kref refcount; 43 /** 44 * @fence: 45 * NULL or a pointer to the fence bound to this object. 46 */ 47 struct dma_fence *fence; 48 /** 49 * @file: 50 * a file backing for this syncobj. 51 */ 52 struct file *file; 53 }; 54 55 void drm_syncobj_free(struct kref *kref); 56 57 /** 58 * drm_syncobj_get - acquire a syncobj reference 59 * @obj: sync object 60 * 61 * This acquires additional reference to @obj. It is illegal to call this 62 * without already holding a reference. No locks required. 63 */ 64 static inline void 65 drm_syncobj_get(struct drm_syncobj *obj) 66 { 67 kref_get(&obj->refcount); 68 } 69 70 /** 71 * drm_syncobj_put - release a reference to a sync object. 72 * @obj: sync object. 73 */ 74 static inline void 75 drm_syncobj_put(struct drm_syncobj *obj) 76 { 77 kref_put(&obj->refcount, drm_syncobj_free); 78 } 79 80 struct drm_syncobj *drm_syncobj_find(struct drm_file *file_private, 81 u32 handle); 82 void drm_syncobj_replace_fence(struct drm_syncobj *syncobj, 83 struct dma_fence *fence); 84 int drm_syncobj_find_fence(struct drm_file *file_private, 85 u32 handle, 86 struct dma_fence **fence); 87 void drm_syncobj_free(struct kref *kref); 88 89 #endif 90