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 #include <linux/kref.h> 38 #include <linux/reservation.h> 39 40 #include <drm/drm_vma_manager.h> 41 42 struct drm_gem_object; 43 44 /** 45 * struct drm_gem_object_funcs - GEM object functions 46 */ 47 struct drm_gem_object_funcs { 48 /** 49 * @free: 50 * 51 * Deconstructor for drm_gem_objects. 52 * 53 * This callback is mandatory. 54 */ 55 void (*free)(struct drm_gem_object *obj); 56 57 /** 58 * @open: 59 * 60 * Called upon GEM handle creation. 61 * 62 * This callback is optional. 63 */ 64 int (*open)(struct drm_gem_object *obj, struct drm_file *file); 65 66 /** 67 * @close: 68 * 69 * Called upon GEM handle release. 70 * 71 * This callback is optional. 72 */ 73 void (*close)(struct drm_gem_object *obj, struct drm_file *file); 74 75 /** 76 * @print_info: 77 * 78 * If driver subclasses struct &drm_gem_object, it can implement this 79 * optional hook for printing additional driver specific info. 80 * 81 * drm_printf_indent() should be used in the callback passing it the 82 * indent argument. 83 * 84 * This callback is called from drm_gem_print_info(). 85 * 86 * This callback is optional. 87 */ 88 void (*print_info)(struct drm_printer *p, unsigned int indent, 89 const struct drm_gem_object *obj); 90 91 /** 92 * @export: 93 * 94 * Export backing buffer as a &dma_buf. 95 * If this is not set drm_gem_prime_export() is used. 96 * 97 * This callback is optional. 98 */ 99 struct dma_buf *(*export)(struct drm_gem_object *obj, int flags); 100 101 /** 102 * @pin: 103 * 104 * Pin backing buffer in memory. 105 * 106 * This callback is optional. 107 */ 108 int (*pin)(struct drm_gem_object *obj); 109 110 /** 111 * @unpin: 112 * 113 * Unpin backing buffer. 114 * 115 * This callback is optional. 116 */ 117 void (*unpin)(struct drm_gem_object *obj); 118 119 /** 120 * @get_sg_table: 121 * 122 * Returns a Scatter-Gather table representation of the buffer. 123 * Used when exporting a buffer. 124 * 125 * This callback is mandatory if buffer export is supported. 126 */ 127 struct sg_table *(*get_sg_table)(struct drm_gem_object *obj); 128 129 /** 130 * @vmap: 131 * 132 * Returns a virtual address for the buffer. 133 * 134 * This callback is optional. 135 */ 136 void *(*vmap)(struct drm_gem_object *obj); 137 138 /** 139 * @vunmap: 140 * 141 * Releases the the address previously returned by @vmap. 142 * 143 * This callback is optional. 144 */ 145 void (*vunmap)(struct drm_gem_object *obj, void *vaddr); 146 147 /** 148 * @vm_ops: 149 * 150 * Virtual memory operations used with mmap. 151 * 152 * This is optional but necessary for mmap support. 153 */ 154 const struct vm_operations_struct *vm_ops; 155 }; 156 157 /** 158 * struct drm_gem_object - GEM buffer object 159 * 160 * This structure defines the generic parts for GEM buffer objects, which are 161 * mostly around handling mmap and userspace handles. 162 * 163 * Buffer objects are often abbreviated to BO. 164 */ 165 struct drm_gem_object { 166 /** 167 * @refcount: 168 * 169 * Reference count of this object 170 * 171 * Please use drm_gem_object_get() to acquire and drm_gem_object_put() 172 * or drm_gem_object_put_unlocked() to release a reference to a GEM 173 * buffer object. 174 */ 175 struct kref refcount; 176 177 /** 178 * @handle_count: 179 * 180 * This is the GEM file_priv handle count of this object. 181 * 182 * Each handle also holds a reference. Note that when the handle_count 183 * drops to 0 any global names (e.g. the id in the flink namespace) will 184 * be cleared. 185 * 186 * Protected by &drm_device.object_name_lock. 187 */ 188 unsigned handle_count; 189 190 /** 191 * @dev: DRM dev this object belongs to. 192 */ 193 struct drm_device *dev; 194 195 /** 196 * @filp: 197 * 198 * SHMEM file node used as backing storage for swappable buffer objects. 199 * GEM also supports driver private objects with driver-specific backing 200 * storage (contiguous CMA memory, special reserved blocks). In this 201 * case @filp is NULL. 202 */ 203 struct file *filp; 204 205 /** 206 * @vma_node: 207 * 208 * Mapping info for this object to support mmap. Drivers are supposed to 209 * allocate the mmap offset using drm_gem_create_mmap_offset(). The 210 * offset itself can be retrieved using drm_vma_node_offset_addr(). 211 * 212 * Memory mapping itself is handled by drm_gem_mmap(), which also checks 213 * that userspace is allowed to access the object. 214 */ 215 struct drm_vma_offset_node vma_node; 216 217 /** 218 * @size: 219 * 220 * Size of the object, in bytes. Immutable over the object's 221 * lifetime. 222 */ 223 size_t size; 224 225 /** 226 * @name: 227 * 228 * Global name for this object, starts at 1. 0 means unnamed. 229 * Access is covered by &drm_device.object_name_lock. This is used by 230 * the GEM_FLINK and GEM_OPEN ioctls. 231 */ 232 int name; 233 234 /** 235 * @dma_buf: 236 * 237 * dma-buf associated with this GEM object. 238 * 239 * Pointer to the dma-buf associated with this gem object (either 240 * through importing or exporting). We break the resulting reference 241 * loop when the last gem handle for this object is released. 242 * 243 * Protected by &drm_device.object_name_lock. 244 */ 245 struct dma_buf *dma_buf; 246 247 /** 248 * @import_attach: 249 * 250 * dma-buf attachment backing this object. 251 * 252 * Any foreign dma_buf imported as a gem object has this set to the 253 * attachment point for the device. This is invariant over the lifetime 254 * of a gem object. 255 * 256 * The &drm_driver.gem_free_object callback is responsible for cleaning 257 * up the dma_buf attachment and references acquired at import time. 258 * 259 * Note that the drm gem/prime core does not depend upon drivers setting 260 * this field any more. So for drivers where this doesn't make sense 261 * (e.g. virtual devices or a displaylink behind an usb bus) they can 262 * simply leave it as NULL. 263 */ 264 struct dma_buf_attachment *import_attach; 265 266 /** 267 * @resv: 268 * 269 * Pointer to reservation object associated with the this GEM object. 270 * 271 * Normally (@resv == &@_resv) except for imported GEM objects. 272 */ 273 struct reservation_object *resv; 274 275 /** 276 * @_resv: 277 * 278 * A reservation object for this GEM object. 279 * 280 * This is unused for imported GEM objects. 281 */ 282 struct reservation_object _resv; 283 284 /** 285 * @funcs: 286 * 287 * Optional GEM object functions. If this is set, it will be used instead of the 288 * corresponding &drm_driver GEM callbacks. 289 * 290 * New drivers should use this. 291 * 292 */ 293 const struct drm_gem_object_funcs *funcs; 294 }; 295 296 /** 297 * DEFINE_DRM_GEM_FOPS() - macro to generate file operations for GEM drivers 298 * @name: name for the generated structure 299 * 300 * This macro autogenerates a suitable &struct file_operations for GEM based 301 * drivers, which can be assigned to &drm_driver.fops. Note that this structure 302 * cannot be shared between drivers, because it contains a reference to the 303 * current module using THIS_MODULE. 304 * 305 * Note that the declaration is already marked as static - if you need a 306 * non-static version of this you're probably doing it wrong and will break the 307 * THIS_MODULE reference by accident. 308 */ 309 #define DEFINE_DRM_GEM_FOPS(name) \ 310 static const struct file_operations name = {\ 311 .owner = THIS_MODULE,\ 312 .open = drm_open,\ 313 .release = drm_release,\ 314 .unlocked_ioctl = drm_ioctl,\ 315 .compat_ioctl = drm_compat_ioctl,\ 316 .poll = drm_poll,\ 317 .read = drm_read,\ 318 .llseek = noop_llseek,\ 319 .mmap = drm_gem_mmap,\ 320 } 321 322 void drm_gem_object_release(struct drm_gem_object *obj); 323 void drm_gem_object_free(struct kref *kref); 324 int drm_gem_object_init(struct drm_device *dev, 325 struct drm_gem_object *obj, size_t size); 326 void drm_gem_private_object_init(struct drm_device *dev, 327 struct drm_gem_object *obj, size_t size); 328 void drm_gem_vm_open(struct vm_area_struct *vma); 329 void drm_gem_vm_close(struct vm_area_struct *vma); 330 int drm_gem_mmap_obj(struct drm_gem_object *obj, unsigned long obj_size, 331 struct vm_area_struct *vma); 332 int drm_gem_mmap(struct file *filp, struct vm_area_struct *vma); 333 334 /** 335 * drm_gem_object_get - acquire a GEM buffer object reference 336 * @obj: GEM buffer object 337 * 338 * This function acquires an additional reference to @obj. It is illegal to 339 * call this without already holding a reference. No locks required. 340 */ 341 static inline void drm_gem_object_get(struct drm_gem_object *obj) 342 { 343 kref_get(&obj->refcount); 344 } 345 346 /** 347 * __drm_gem_object_put - raw function to release a GEM buffer object reference 348 * @obj: GEM buffer object 349 * 350 * This function is meant to be used by drivers which are not encumbered with 351 * &drm_device.struct_mutex legacy locking and which are using the 352 * gem_free_object_unlocked callback. It avoids all the locking checks and 353 * locking overhead of drm_gem_object_put() and drm_gem_object_put_unlocked(). 354 * 355 * Drivers should never call this directly in their code. Instead they should 356 * wrap it up into a ``driver_gem_object_put(struct driver_gem_object *obj)`` 357 * wrapper function, and use that. Shared code should never call this, to 358 * avoid breaking drivers by accident which still depend upon 359 * &drm_device.struct_mutex locking. 360 */ 361 static inline void 362 __drm_gem_object_put(struct drm_gem_object *obj) 363 { 364 kref_put(&obj->refcount, drm_gem_object_free); 365 } 366 367 void drm_gem_object_put_unlocked(struct drm_gem_object *obj); 368 void drm_gem_object_put(struct drm_gem_object *obj); 369 370 int drm_gem_handle_create(struct drm_file *file_priv, 371 struct drm_gem_object *obj, 372 u32 *handlep); 373 int drm_gem_handle_delete(struct drm_file *filp, u32 handle); 374 375 376 void drm_gem_free_mmap_offset(struct drm_gem_object *obj); 377 int drm_gem_create_mmap_offset(struct drm_gem_object *obj); 378 int drm_gem_create_mmap_offset_size(struct drm_gem_object *obj, size_t size); 379 380 struct page **drm_gem_get_pages(struct drm_gem_object *obj); 381 void drm_gem_put_pages(struct drm_gem_object *obj, struct page **pages, 382 bool dirty, bool accessed); 383 384 int drm_gem_objects_lookup(struct drm_file *filp, void __user *bo_handles, 385 int count, struct drm_gem_object ***objs_out); 386 struct drm_gem_object *drm_gem_object_lookup(struct drm_file *filp, u32 handle); 387 long drm_gem_reservation_object_wait(struct drm_file *filep, u32 handle, 388 bool wait_all, unsigned long timeout); 389 int drm_gem_lock_reservations(struct drm_gem_object **objs, int count, 390 struct ww_acquire_ctx *acquire_ctx); 391 void drm_gem_unlock_reservations(struct drm_gem_object **objs, int count, 392 struct ww_acquire_ctx *acquire_ctx); 393 int drm_gem_fence_array_add(struct xarray *fence_array, 394 struct dma_fence *fence); 395 int drm_gem_fence_array_add_implicit(struct xarray *fence_array, 396 struct drm_gem_object *obj, 397 bool write); 398 int drm_gem_dumb_map_offset(struct drm_file *file, struct drm_device *dev, 399 u32 handle, u64 *offset); 400 int drm_gem_dumb_destroy(struct drm_file *file, 401 struct drm_device *dev, 402 uint32_t handle); 403 404 #endif /* __DRM_GEM_H__ */ 405