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 * struct drm_gem_object - GEM buffer object 39 * 40 * This structure defines the generic parts for GEM buffer objects, which are 41 * mostly around handling mmap and userspace handles. 42 * 43 * Buffer objects are often abbreviated to BO. 44 */ 45 struct drm_gem_object { 46 /** 47 * @refcount: 48 * 49 * Reference count of this object 50 * 51 * Please use drm_gem_object_reference() to acquire and 52 * drm_gem_object_unreference() or drm_gem_object_unreference_unlocked() 53 * to release a reference to a GEM buffer object. 54 */ 55 struct kref refcount; 56 57 /** 58 * @handle_count: 59 * 60 * This is the GEM file_priv handle count of this object. 61 * 62 * Each handle also holds a reference. Note that when the handle_count 63 * drops to 0 any global names (e.g. the id in the flink namespace) will 64 * be cleared. 65 * 66 * Protected by &drm_device.object_name_lock. 67 */ 68 unsigned handle_count; 69 70 /** 71 * @dev: DRM dev this object belongs to. 72 */ 73 struct drm_device *dev; 74 75 /** 76 * @filp: 77 * 78 * SHMEM file node used as backing storage for swappable buffer objects. 79 * GEM also supports driver private objects with driver-specific backing 80 * storage (contiguous CMA memory, special reserved blocks). In this 81 * case @filp is NULL. 82 */ 83 struct file *filp; 84 85 /** 86 * @vma_node: 87 * 88 * Mapping info for this object to support mmap. Drivers are supposed to 89 * allocate the mmap offset using drm_gem_create_mmap_offset(). The 90 * offset itself can be retrieved using drm_vma_node_offset_addr(). 91 * 92 * Memory mapping itself is handled by drm_gem_mmap(), which also checks 93 * that userspace is allowed to access the object. 94 */ 95 struct drm_vma_offset_node vma_node; 96 97 /** 98 * @size: 99 * 100 * Size of the object, in bytes. Immutable over the object's 101 * lifetime. 102 */ 103 size_t size; 104 105 /** 106 * @name: 107 * 108 * Global name for this object, starts at 1. 0 means unnamed. 109 * Access is covered by &drm_device.object_name_lock. This is used by 110 * the GEM_FLINK and GEM_OPEN ioctls. 111 */ 112 int name; 113 114 /** 115 * @read_domains: 116 * 117 * Read memory domains. These monitor which caches contain read/write data 118 * related to the object. When transitioning from one set of domains 119 * to another, the driver is called to ensure that caches are suitably 120 * flushed and invalidated. 121 */ 122 uint32_t read_domains; 123 124 /** 125 * @write_domain: Corresponding unique write memory domain. 126 */ 127 uint32_t write_domain; 128 129 /** 130 * @pending_read_domains: 131 * 132 * While validating an exec operation, the 133 * new read/write domain values are computed here. 134 * They will be transferred to the above values 135 * at the point that any cache flushing occurs 136 */ 137 uint32_t pending_read_domains; 138 139 /** 140 * @pending_write_domain: Write domain similar to @pending_read_domains. 141 */ 142 uint32_t pending_write_domain; 143 144 /** 145 * @dma_buf: 146 * 147 * dma-buf associated with this GEM object. 148 * 149 * Pointer to the dma-buf associated with this gem object (either 150 * through importing or exporting). We break the resulting reference 151 * loop when the last gem handle for this object is released. 152 * 153 * Protected by &drm_device.object_name_lock. 154 */ 155 struct dma_buf *dma_buf; 156 157 /** 158 * @import_attach: 159 * 160 * dma-buf attachment backing this object. 161 * 162 * Any foreign dma_buf imported as a gem object has this set to the 163 * attachment point for the device. This is invariant over the lifetime 164 * of a gem object. 165 * 166 * The &drm_driver.gem_free_object callback is responsible for cleaning 167 * up the dma_buf attachment and references acquired at import time. 168 * 169 * Note that the drm gem/prime core does not depend upon drivers setting 170 * this field any more. So for drivers where this doesn't make sense 171 * (e.g. virtual devices or a displaylink behind an usb bus) they can 172 * simply leave it as NULL. 173 */ 174 struct dma_buf_attachment *import_attach; 175 }; 176 177 void drm_gem_object_release(struct drm_gem_object *obj); 178 void drm_gem_object_free(struct kref *kref); 179 int drm_gem_object_init(struct drm_device *dev, 180 struct drm_gem_object *obj, size_t size); 181 void drm_gem_private_object_init(struct drm_device *dev, 182 struct drm_gem_object *obj, size_t size); 183 void drm_gem_vm_open(struct vm_area_struct *vma); 184 void drm_gem_vm_close(struct vm_area_struct *vma); 185 int drm_gem_mmap_obj(struct drm_gem_object *obj, unsigned long obj_size, 186 struct vm_area_struct *vma); 187 int drm_gem_mmap(struct file *filp, struct vm_area_struct *vma); 188 189 /** 190 * drm_gem_object_reference - acquire a GEM BO reference 191 * @obj: GEM buffer object 192 * 193 * This acquires additional reference to @obj. It is illegal to call this 194 * without already holding a reference. No locks required. 195 */ 196 static inline void 197 drm_gem_object_reference(struct drm_gem_object *obj) 198 { 199 kref_get(&obj->refcount); 200 } 201 202 /** 203 * __drm_gem_object_unreference - raw function to release a GEM BO reference 204 * @obj: GEM buffer object 205 * 206 * This function is meant to be used by drivers which are not encumbered with 207 * &drm_device.struct_mutex legacy locking and which are using the 208 * gem_free_object_unlocked callback. It avoids all the locking checks and 209 * locking overhead of drm_gem_object_unreference() and 210 * drm_gem_object_unreference_unlocked(). 211 * 212 * Drivers should never call this directly in their code. Instead they should 213 * wrap it up into a ``driver_gem_object_unreference(struct driver_gem_object 214 * *obj)`` wrapper function, and use that. Shared code should never call this, to 215 * avoid breaking drivers by accident which still depend upon 216 * &drm_device.struct_mutex locking. 217 */ 218 static inline void 219 __drm_gem_object_unreference(struct drm_gem_object *obj) 220 { 221 kref_put(&obj->refcount, drm_gem_object_free); 222 } 223 224 void drm_gem_object_unreference_unlocked(struct drm_gem_object *obj); 225 void drm_gem_object_unreference(struct drm_gem_object *obj); 226 227 int drm_gem_handle_create(struct drm_file *file_priv, 228 struct drm_gem_object *obj, 229 u32 *handlep); 230 int drm_gem_handle_delete(struct drm_file *filp, u32 handle); 231 232 233 void drm_gem_free_mmap_offset(struct drm_gem_object *obj); 234 int drm_gem_create_mmap_offset(struct drm_gem_object *obj); 235 int drm_gem_create_mmap_offset_size(struct drm_gem_object *obj, size_t size); 236 237 struct page **drm_gem_get_pages(struct drm_gem_object *obj); 238 void drm_gem_put_pages(struct drm_gem_object *obj, struct page **pages, 239 bool dirty, bool accessed); 240 241 struct drm_gem_object *drm_gem_object_lookup(struct drm_file *filp, u32 handle); 242 int drm_gem_dumb_destroy(struct drm_file *file, 243 struct drm_device *dev, 244 uint32_t handle); 245 246 #endif /* __DRM_GEM_H__ */ 247