1 #ifndef __DRM_GEM_H__ 2 #define __DRM_GEM_H__ 3 4 /* 5 * GEM Graphics Execution Manager Driver Interfaces 6 * 7 * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas. 8 * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California. 9 * Copyright (c) 2009-2010, Code Aurora Forum. 10 * All rights reserved. 11 * Copyright © 2014 Intel Corporation 12 * Daniel Vetter <daniel.vetter@ffwll.ch> 13 * 14 * Author: Rickard E. (Rik) Faith <faith@valinux.com> 15 * Author: Gareth Hughes <gareth@valinux.com> 16 * 17 * Permission is hereby granted, free of charge, to any person obtaining a 18 * copy of this software and associated documentation files (the "Software"), 19 * to deal in the Software without restriction, including without limitation 20 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 21 * and/or sell copies of the Software, and to permit persons to whom the 22 * Software is furnished to do so, subject to the following conditions: 23 * 24 * The above copyright notice and this permission notice (including the next 25 * paragraph) shall be included in all copies or substantial portions of the 26 * Software. 27 * 28 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 29 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 30 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 31 * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR 32 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, 33 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR 34 * OTHER DEALINGS IN THE SOFTWARE. 35 */ 36 37 /** 38 * This structure defines the drm_mm memory object, which will be used by the 39 * DRM for its buffer objects. 40 */ 41 struct drm_gem_object { 42 /** Reference count of this object */ 43 struct kref refcount; 44 45 /** 46 * handle_count - gem file_priv handle count of this object 47 * 48 * Each handle also holds a reference. Note that when the handle_count 49 * drops to 0 any global names (e.g. the id in the flink namespace) will 50 * be cleared. 51 * 52 * Protected by dev->object_name_lock. 53 * */ 54 unsigned handle_count; 55 56 /** Related drm device */ 57 struct drm_device *dev; 58 59 /** File representing the shmem storage */ 60 struct file *filp; 61 62 /* Mapping info for this object */ 63 struct drm_vma_offset_node vma_node; 64 65 /** 66 * Size of the object, in bytes. Immutable over the object's 67 * lifetime. 68 */ 69 size_t size; 70 71 /** 72 * Global name for this object, starts at 1. 0 means unnamed. 73 * Access is covered by the object_name_lock in the related drm_device 74 */ 75 int name; 76 77 /** 78 * Memory domains. These monitor which caches contain read/write data 79 * related to the object. When transitioning from one set of domains 80 * to another, the driver is called to ensure that caches are suitably 81 * flushed and invalidated 82 */ 83 uint32_t read_domains; 84 uint32_t write_domain; 85 86 /** 87 * While validating an exec operation, the 88 * new read/write domain values are computed here. 89 * They will be transferred to the above values 90 * at the point that any cache flushing occurs 91 */ 92 uint32_t pending_read_domains; 93 uint32_t pending_write_domain; 94 95 /** 96 * dma_buf - dma buf associated with this GEM object 97 * 98 * Pointer to the dma-buf associated with this gem object (either 99 * through importing or exporting). We break the resulting reference 100 * loop when the last gem handle for this object is released. 101 * 102 * Protected by obj->object_name_lock 103 */ 104 struct dma_buf *dma_buf; 105 106 /** 107 * import_attach - dma buf attachment backing this object 108 * 109 * Any foreign dma_buf imported as a gem object has this set to the 110 * attachment point for the device. This is invariant over the lifetime 111 * of a gem object. 112 * 113 * The driver's ->gem_free_object callback is responsible for cleaning 114 * up the dma_buf attachment and references acquired at import time. 115 * 116 * Note that the drm gem/prime core does not depend upon drivers setting 117 * this field any more. So for drivers where this doesn't make sense 118 * (e.g. virtual devices or a displaylink behind an usb bus) they can 119 * simply leave it as NULL. 120 */ 121 struct dma_buf_attachment *import_attach; 122 }; 123 124 void drm_gem_object_release(struct drm_gem_object *obj); 125 void drm_gem_object_free(struct kref *kref); 126 int drm_gem_object_init(struct drm_device *dev, 127 struct drm_gem_object *obj, size_t size); 128 void drm_gem_private_object_init(struct drm_device *dev, 129 struct drm_gem_object *obj, size_t size); 130 void drm_gem_vm_open(struct vm_area_struct *vma); 131 void drm_gem_vm_close(struct vm_area_struct *vma); 132 int drm_gem_mmap_obj(struct drm_gem_object *obj, unsigned long obj_size, 133 struct vm_area_struct *vma); 134 int drm_gem_mmap(struct file *filp, struct vm_area_struct *vma); 135 136 static inline void 137 drm_gem_object_reference(struct drm_gem_object *obj) 138 { 139 kref_get(&obj->refcount); 140 } 141 142 static inline void 143 drm_gem_object_unreference(struct drm_gem_object *obj) 144 { 145 if (obj != NULL) 146 kref_put(&obj->refcount, drm_gem_object_free); 147 } 148 149 static inline void 150 drm_gem_object_unreference_unlocked(struct drm_gem_object *obj) 151 { 152 if (obj && !atomic_add_unless(&obj->refcount.refcount, -1, 1)) { 153 struct drm_device *dev = obj->dev; 154 155 mutex_lock(&dev->struct_mutex); 156 if (likely(atomic_dec_and_test(&obj->refcount.refcount))) 157 drm_gem_object_free(&obj->refcount); 158 mutex_unlock(&dev->struct_mutex); 159 } 160 } 161 162 int drm_gem_handle_create(struct drm_file *file_priv, 163 struct drm_gem_object *obj, 164 u32 *handlep); 165 int drm_gem_handle_delete(struct drm_file *filp, u32 handle); 166 167 168 void drm_gem_free_mmap_offset(struct drm_gem_object *obj); 169 int drm_gem_create_mmap_offset(struct drm_gem_object *obj); 170 int drm_gem_create_mmap_offset_size(struct drm_gem_object *obj, size_t size); 171 172 struct page **drm_gem_get_pages(struct drm_gem_object *obj); 173 void drm_gem_put_pages(struct drm_gem_object *obj, struct page **pages, 174 bool dirty, bool accessed); 175 176 struct drm_gem_object *drm_gem_object_lookup(struct drm_device *dev, 177 struct drm_file *filp, 178 u32 handle); 179 int drm_gem_dumb_destroy(struct drm_file *file, 180 struct drm_device *dev, 181 uint32_t handle); 182 183 #endif /* __DRM_GEM_H__ */ 184