| 1 | /*- |
| 2 | * Copyright (c) 2011 The FreeBSD Foundation |
| 3 | * All rights reserved. |
| 4 | * |
| 5 | * This software was developed by Konstantin Belousov under sponsorship from |
| 6 | * the FreeBSD Foundation. |
| 7 | * |
| 8 | * Redistribution and use in source and binary forms, with or without |
| 9 | * modification, are permitted provided that the following conditions |
| 10 | * are met: |
| 11 | * 1. Redistributions of source code must retain the above copyright |
| 12 | * notice, this list of conditions and the following disclaimer. |
| 13 | * 2. Redistributions in binary form must reproduce the above copyright |
| 14 | * notice, this list of conditions and the following disclaimer in the |
| 15 | * documentation and/or other materials provided with the distribution. |
| 16 | * |
| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND |
| 18 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 19 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 20 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
| 21 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 22 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 23 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 24 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 25 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 26 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 27 | * SUCH DAMAGE. |
| 28 | * |
| 29 | * $FreeBSD: head/sys/dev/drm2/drm_gem.c 247835 2013-03-05 09:49:34Z kib $" |
| 30 | */ |
| 31 | |
| 32 | #include "opt_vm.h" |
| 33 | |
| 34 | #include <sys/param.h> |
| 35 | #include <sys/systm.h> |
| 36 | #include <sys/limits.h> |
| 37 | #include <sys/lock.h> |
| 38 | #include <sys/mutex.h> |
| 39 | #include <sys/conf.h> |
| 40 | |
| 41 | #include <vm/vm.h> |
| 42 | #include <vm/vm_page.h> |
| 43 | |
| 44 | #include <drm/drmP.h> |
| 45 | |
| 46 | /* |
| 47 | * We make up offsets for buffer objects so we can recognize them at |
| 48 | * mmap time. |
| 49 | */ |
| 50 | |
| 51 | /* pgoff in mmap is an unsigned long, so we need to make sure that |
| 52 | * the faked up offset will fit |
| 53 | */ |
| 54 | |
| 55 | #if ULONG_MAX == UINT64_MAX |
| 56 | #define DRM_FILE_PAGE_OFFSET_START ((0xFFFFFFFFUL >> PAGE_SHIFT) + 1) |
| 57 | #define DRM_FILE_PAGE_OFFSET_SIZE ((0xFFFFFFFFUL >> PAGE_SHIFT) * 16) |
| 58 | #else |
| 59 | #define DRM_FILE_PAGE_OFFSET_START ((0xFFFFFFFUL >> PAGE_SHIFT) + 1) |
| 60 | #define DRM_FILE_PAGE_OFFSET_SIZE ((0xFFFFFFFUL >> PAGE_SHIFT) * 16) |
| 61 | #endif |
| 62 | |
| 63 | /** |
| 64 | * Initialize the GEM device fields |
| 65 | */ |
| 66 | |
| 67 | int |
| 68 | drm_gem_init(struct drm_device *dev) |
| 69 | { |
| 70 | struct drm_gem_mm *mm; |
| 71 | |
| 72 | lockinit(&dev->object_name_lock, "objnam", 0, LK_CANRECURSE); |
| 73 | idr_init(&dev->object_name_idr); |
| 74 | |
| 75 | mm = kmalloc(sizeof(*mm), DRM_MEM_DRIVER, M_WAITOK); |
| 76 | if (!mm) { |
| 77 | DRM_ERROR("out of memory\n"); |
| 78 | return -ENOMEM; |
| 79 | } |
| 80 | |
| 81 | dev->mm_private = mm; |
| 82 | |
| 83 | if (drm_ht_create(&mm->offset_hash, 12)) { |
| 84 | drm_free(mm, DRM_MEM_DRIVER); |
| 85 | return -ENOMEM; |
| 86 | } |
| 87 | |
| 88 | mm->idxunr = new_unrhdr(0, DRM_GEM_MAX_IDX, NULL); |
| 89 | return 0; |
| 90 | } |
| 91 | |
| 92 | void |
| 93 | drm_gem_destroy(struct drm_device *dev) |
| 94 | { |
| 95 | struct drm_gem_mm *mm = dev->mm_private; |
| 96 | |
| 97 | drm_ht_remove(&mm->offset_hash); |
| 98 | delete_unrhdr(mm->idxunr); |
| 99 | drm_free(mm, DRM_MEM_DRIVER); |
| 100 | dev->mm_private = NULL; |
| 101 | } |
| 102 | |
| 103 | /** |
| 104 | * Initialize an already allocated GEM object of the specified size with |
| 105 | * shmfs backing store. |
| 106 | */ |
| 107 | int drm_gem_object_init(struct drm_device *dev, |
| 108 | struct drm_gem_object *obj, size_t size) |
| 109 | { |
| 110 | |
| 111 | KASSERT((size & (PAGE_SIZE - 1)) == 0, |
| 112 | ("Bad size %ju", (uintmax_t)size)); |
| 113 | |
| 114 | obj->dev = dev; |
| 115 | obj->vm_obj = default_pager_alloc(NULL, size, |
| 116 | VM_PROT_READ | VM_PROT_WRITE, 0); |
| 117 | |
| 118 | kref_init(&obj->refcount); |
| 119 | atomic_set(&obj->handle_count, 0); |
| 120 | obj->size = size; |
| 121 | |
| 122 | return (0); |
| 123 | } |
| 124 | |
| 125 | /** |
| 126 | * Initialize an already allocated GEM object of the specified size with |
| 127 | * no GEM provided backing store. Instead the caller is responsible for |
| 128 | * backing the object and handling it. |
| 129 | */ |
| 130 | int drm_gem_private_object_init(struct drm_device *dev, |
| 131 | struct drm_gem_object *obj, size_t size) |
| 132 | { |
| 133 | |
| 134 | KASSERT((size & (PAGE_SIZE - 1)) == 0, |
| 135 | ("Bad size %ju", (uintmax_t)size)); |
| 136 | |
| 137 | obj->dev = dev; |
| 138 | obj->vm_obj = NULL; |
| 139 | |
| 140 | kref_init(&obj->refcount); |
| 141 | atomic_set(&obj->handle_count, 0); |
| 142 | obj->size = size; |
| 143 | |
| 144 | return (0); |
| 145 | } |
| 146 | |
| 147 | |
| 148 | struct drm_gem_object * |
| 149 | drm_gem_object_alloc(struct drm_device *dev, size_t size) |
| 150 | { |
| 151 | struct drm_gem_object *obj; |
| 152 | |
| 153 | obj = kmalloc(sizeof(*obj), DRM_MEM_DRIVER, M_WAITOK | M_ZERO); |
| 154 | if (drm_gem_object_init(dev, obj, size) != 0) |
| 155 | goto free; |
| 156 | |
| 157 | if (dev->driver->gem_init_object != NULL && |
| 158 | dev->driver->gem_init_object(obj) != 0) |
| 159 | goto dealloc; |
| 160 | return (obj); |
| 161 | dealloc: |
| 162 | vm_object_deallocate(obj->vm_obj); |
| 163 | free: |
| 164 | drm_free(obj, DRM_MEM_DRIVER); |
| 165 | return (NULL); |
| 166 | } |
| 167 | |
| 168 | /** |
| 169 | * Called after the last reference to the object has been lost. |
| 170 | * Must be called holding struct_ mutex |
| 171 | * |
| 172 | * Frees the object |
| 173 | */ |
| 174 | void |
| 175 | drm_gem_object_free(struct kref *kref) |
| 176 | { |
| 177 | struct drm_gem_object *obj = (struct drm_gem_object *) kref; |
| 178 | struct drm_device *dev = obj->dev; |
| 179 | |
| 180 | DRM_LOCK_ASSERT(dev); |
| 181 | if (dev->driver->gem_free_object != NULL) |
| 182 | dev->driver->gem_free_object(obj); |
| 183 | } |
| 184 | |
| 185 | static void drm_gem_object_ref_bug(struct kref *list_kref) |
| 186 | { |
| 187 | panic("BUG"); |
| 188 | } |
| 189 | |
| 190 | /** |
| 191 | * Called after the last handle to the object has been closed |
| 192 | * |
| 193 | * Removes any name for the object. Note that this must be |
| 194 | * called before drm_gem_object_free or we'll be touching |
| 195 | * freed memory |
| 196 | */ |
| 197 | void drm_gem_object_handle_free(struct drm_gem_object *obj) |
| 198 | { |
| 199 | struct drm_device *dev = obj->dev; |
| 200 | |
| 201 | /* Remove any name for this object */ |
| 202 | lockmgr(&dev->object_name_lock, LK_EXCLUSIVE); |
| 203 | if (obj->name) { |
| 204 | idr_remove(&dev->object_name_idr, obj->name); |
| 205 | obj->name = 0; |
| 206 | lockmgr(&dev->object_name_lock, LK_RELEASE); |
| 207 | /* |
| 208 | * The object name held a reference to this object, drop |
| 209 | * that now. |
| 210 | * |
| 211 | * This cannot be the last reference, since the handle holds one too. |
| 212 | */ |
| 213 | kref_put(&obj->refcount, drm_gem_object_ref_bug); |
| 214 | } else |
| 215 | lockmgr(&dev->object_name_lock, LK_RELEASE); |
| 216 | |
| 217 | } |
| 218 | |
| 219 | /** |
| 220 | * Removes the mapping from handle to filp for this object. |
| 221 | */ |
| 222 | int |
| 223 | drm_gem_handle_delete(struct drm_file *filp, u32 handle) |
| 224 | { |
| 225 | struct drm_device *dev; |
| 226 | struct drm_gem_object *obj; |
| 227 | |
| 228 | /* This is gross. The idr system doesn't let us try a delete and |
| 229 | * return an error code. It just spews if you fail at deleting. |
| 230 | * So, we have to grab a lock around finding the object and then |
| 231 | * doing the delete on it and dropping the refcount, or the user |
| 232 | * could race us to double-decrement the refcount and cause a |
| 233 | * use-after-free later. Given the frequency of our handle lookups, |
| 234 | * we may want to use ida for number allocation and a hash table |
| 235 | * for the pointers, anyway. |
| 236 | */ |
| 237 | lockmgr(&filp->table_lock, LK_EXCLUSIVE); |
| 238 | |
| 239 | /* Check if we currently have a reference on the object */ |
| 240 | obj = idr_find(&filp->object_idr, handle); |
| 241 | if (obj == NULL) { |
| 242 | lockmgr(&filp->table_lock, LK_RELEASE); |
| 243 | return -EINVAL; |
| 244 | } |
| 245 | dev = obj->dev; |
| 246 | |
| 247 | /* Release reference and decrement refcount. */ |
| 248 | idr_remove(&filp->object_idr, handle); |
| 249 | lockmgr(&filp->table_lock, LK_RELEASE); |
| 250 | |
| 251 | if (dev->driver->gem_close_object) |
| 252 | dev->driver->gem_close_object(obj, filp); |
| 253 | drm_gem_object_handle_unreference_unlocked(obj); |
| 254 | |
| 255 | return 0; |
| 256 | } |
| 257 | |
| 258 | /** |
| 259 | * Create a handle for this object. This adds a handle reference |
| 260 | * to the object, which includes a regular reference count. Callers |
| 261 | * will likely want to dereference the object afterwards. |
| 262 | */ |
| 263 | int |
| 264 | drm_gem_handle_create(struct drm_file *file_priv, |
| 265 | struct drm_gem_object *obj, |
| 266 | u32 *handlep) |
| 267 | { |
| 268 | struct drm_device *dev = obj->dev; |
| 269 | int ret; |
| 270 | |
| 271 | /* |
| 272 | * Get the user-visible handle using idr. |
| 273 | */ |
| 274 | again: |
| 275 | /* ensure there is space available to allocate a handle */ |
| 276 | if (idr_pre_get(&file_priv->object_idr, GFP_KERNEL) == 0) |
| 277 | return -ENOMEM; |
| 278 | |
| 279 | /* do the allocation under our spinlock */ |
| 280 | lockmgr(&file_priv->table_lock, LK_EXCLUSIVE); |
| 281 | ret = idr_get_new_above(&file_priv->object_idr, obj, 1, (int *)handlep); |
| 282 | lockmgr(&file_priv->table_lock, LK_RELEASE); |
| 283 | if (ret == -EAGAIN) |
| 284 | goto again; |
| 285 | else if (ret) |
| 286 | return ret; |
| 287 | |
| 288 | drm_gem_object_handle_reference(obj); |
| 289 | |
| 290 | if (dev->driver->gem_open_object) { |
| 291 | ret = dev->driver->gem_open_object(obj, file_priv); |
| 292 | if (ret) { |
| 293 | drm_gem_handle_delete(file_priv, *handlep); |
| 294 | return ret; |
| 295 | } |
| 296 | } |
| 297 | |
| 298 | return 0; |
| 299 | } |
| 300 | |
| 301 | /** Returns a reference to the object named by the handle. */ |
| 302 | struct drm_gem_object * |
| 303 | drm_gem_object_lookup(struct drm_device *dev, struct drm_file *filp, |
| 304 | u32 handle) |
| 305 | { |
| 306 | struct drm_gem_object *obj; |
| 307 | |
| 308 | lockmgr(&filp->table_lock, LK_EXCLUSIVE); |
| 309 | |
| 310 | /* Check if we currently have a reference on the object */ |
| 311 | obj = idr_find(&filp->object_idr, handle); |
| 312 | if (obj == NULL) { |
| 313 | lockmgr(&filp->table_lock, LK_RELEASE); |
| 314 | return NULL; |
| 315 | } |
| 316 | |
| 317 | drm_gem_object_reference(obj); |
| 318 | |
| 319 | lockmgr(&filp->table_lock, LK_RELEASE); |
| 320 | |
| 321 | return obj; |
| 322 | } |
| 323 | |
| 324 | int |
| 325 | drm_gem_close_ioctl(struct drm_device *dev, void *data, |
| 326 | struct drm_file *file_priv) |
| 327 | { |
| 328 | struct drm_gem_close *args; |
| 329 | |
| 330 | if (!drm_core_check_feature(dev, DRIVER_GEM)) |
| 331 | return (ENODEV); |
| 332 | args = data; |
| 333 | |
| 334 | return (drm_gem_handle_delete(file_priv, args->handle)); |
| 335 | } |
| 336 | |
| 337 | /** |
| 338 | * Create a global name for an object, returning the name. |
| 339 | * |
| 340 | * Note that the name does not hold a reference; when the object |
| 341 | * is freed, the name goes away. |
| 342 | */ |
| 343 | int |
| 344 | drm_gem_flink_ioctl(struct drm_device *dev, void *data, |
| 345 | struct drm_file *file_priv) |
| 346 | { |
| 347 | struct drm_gem_flink *args = data; |
| 348 | struct drm_gem_object *obj; |
| 349 | int ret; |
| 350 | |
| 351 | if (!drm_core_check_feature(dev, DRIVER_GEM)) |
| 352 | return -ENODEV; |
| 353 | |
| 354 | obj = drm_gem_object_lookup(dev, file_priv, args->handle); |
| 355 | if (obj == NULL) |
| 356 | return -ENOENT; |
| 357 | |
| 358 | again: |
| 359 | if (idr_pre_get(&dev->object_name_idr, GFP_KERNEL) == 0) { |
| 360 | ret = -ENOMEM; |
| 361 | goto err; |
| 362 | } |
| 363 | |
| 364 | lockmgr(&dev->object_name_lock, LK_EXCLUSIVE); |
| 365 | if (!obj->name) { |
| 366 | ret = idr_get_new_above(&dev->object_name_idr, obj, 1, |
| 367 | &obj->name); |
| 368 | args->name = (uint64_t) obj->name; |
| 369 | lockmgr(&dev->object_name_lock, LK_RELEASE); |
| 370 | |
| 371 | if (ret == -EAGAIN) |
| 372 | goto again; |
| 373 | else if (ret) |
| 374 | goto err; |
| 375 | |
| 376 | /* Allocate a reference for the name table. */ |
| 377 | drm_gem_object_reference(obj); |
| 378 | } else { |
| 379 | args->name = (uint64_t) obj->name; |
| 380 | lockmgr(&dev->object_name_lock, LK_RELEASE); |
| 381 | ret = 0; |
| 382 | } |
| 383 | |
| 384 | err: |
| 385 | drm_gem_object_unreference_unlocked(obj); |
| 386 | return ret; |
| 387 | } |
| 388 | |
| 389 | /** |
| 390 | * Open an object using the global name, returning a handle and the size. |
| 391 | * |
| 392 | * This handle (of course) holds a reference to the object, so the object |
| 393 | * will not go away until the handle is deleted. |
| 394 | */ |
| 395 | int |
| 396 | drm_gem_open_ioctl(struct drm_device *dev, void *data, |
| 397 | struct drm_file *file_priv) |
| 398 | { |
| 399 | struct drm_gem_open *args = data; |
| 400 | struct drm_gem_object *obj; |
| 401 | int ret; |
| 402 | u32 handle; |
| 403 | |
| 404 | #if 0 |
| 405 | if (!drm_core_check_feature(dev, DRIVER_GEM)) |
| 406 | #endif |
| 407 | if (!(dev->driver->driver_features & DRIVER_GEM)) |
| 408 | return -ENODEV; |
| 409 | |
| 410 | lockmgr(&dev->object_name_lock, LK_EXCLUSIVE); |
| 411 | obj = idr_find(&dev->object_name_idr, (int) args->name); |
| 412 | if (obj) |
| 413 | drm_gem_object_reference(obj); |
| 414 | lockmgr(&dev->object_name_lock, LK_RELEASE); |
| 415 | if (!obj) |
| 416 | return -ENOENT; |
| 417 | |
| 418 | ret = drm_gem_handle_create(file_priv, obj, &handle); |
| 419 | drm_gem_object_unreference_unlocked(obj); |
| 420 | if (ret) |
| 421 | return ret; |
| 422 | |
| 423 | args->handle = handle; |
| 424 | args->size = obj->size; |
| 425 | |
| 426 | return 0; |
| 427 | } |
| 428 | |
| 429 | /** |
| 430 | * Called at device open time, sets up the structure for handling refcounting |
| 431 | * of mm objects. |
| 432 | */ |
| 433 | void |
| 434 | drm_gem_open(struct drm_device *dev, struct drm_file *file_private) |
| 435 | { |
| 436 | idr_init(&file_private->object_idr); |
| 437 | lockinit(&file_private->table_lock, "fptab", 0, LK_CANRECURSE); |
| 438 | } |
| 439 | |
| 440 | /** |
| 441 | * Called at device close to release the file's |
| 442 | * handle references on objects. |
| 443 | */ |
| 444 | static int |
| 445 | drm_gem_object_release_handle(int id, void *ptr, void *data) |
| 446 | { |
| 447 | struct drm_file *file_priv = data; |
| 448 | struct drm_gem_object *obj = ptr; |
| 449 | struct drm_device *dev = obj->dev; |
| 450 | |
| 451 | if (dev->driver->gem_close_object) |
| 452 | dev->driver->gem_close_object(obj, file_priv); |
| 453 | |
| 454 | drm_gem_object_handle_unreference_unlocked(obj); |
| 455 | |
| 456 | return 0; |
| 457 | } |
| 458 | |
| 459 | void |
| 460 | drm_gem_object_release(struct drm_gem_object *obj) |
| 461 | { |
| 462 | |
| 463 | /* |
| 464 | * obj->vm_obj can be NULL for private gem objects. |
| 465 | */ |
| 466 | vm_object_deallocate(obj->vm_obj); |
| 467 | } |
| 468 | |
| 469 | /** |
| 470 | * Called at close time when the filp is going away. |
| 471 | * |
| 472 | * Releases any remaining references on objects by this filp. |
| 473 | */ |
| 474 | void |
| 475 | drm_gem_release(struct drm_device *dev, struct drm_file *file_private) |
| 476 | { |
| 477 | idr_for_each(&file_private->object_idr, |
| 478 | &drm_gem_object_release_handle, file_private); |
| 479 | |
| 480 | idr_remove_all(&file_private->object_idr); |
| 481 | idr_destroy(&file_private->object_idr); |
| 482 | } |
| 483 | |
| 484 | static struct drm_gem_object * |
| 485 | drm_gem_object_from_offset(struct drm_device *dev, vm_ooffset_t offset) |
| 486 | { |
| 487 | struct drm_gem_object *obj; |
| 488 | struct drm_gem_mm *mm; |
| 489 | struct drm_hash_item *map_list; |
| 490 | |
| 491 | if ((offset & DRM_GEM_MAPPING_MASK) != DRM_GEM_MAPPING_KEY) |
| 492 | return (NULL); |
| 493 | offset &= ~DRM_GEM_MAPPING_KEY; |
| 494 | mm = dev->mm_private; |
| 495 | if (drm_ht_find_item(&mm->offset_hash, DRM_GEM_MAPPING_IDX(offset), |
| 496 | &map_list) != 0) { |
| 497 | DRM_DEBUG("drm_gem_object_from_offset: offset 0x%jx obj not found\n", |
| 498 | (uintmax_t)offset); |
| 499 | return (NULL); |
| 500 | } |
| 501 | obj = container_of(map_list, struct drm_gem_object, map_list); |
| 502 | return (obj); |
| 503 | } |
| 504 | |
| 505 | int |
| 506 | drm_gem_create_mmap_offset(struct drm_gem_object *obj) |
| 507 | { |
| 508 | struct drm_device *dev; |
| 509 | struct drm_gem_mm *mm; |
| 510 | int ret; |
| 511 | |
| 512 | if (obj->on_map) |
| 513 | return (0); |
| 514 | dev = obj->dev; |
| 515 | mm = dev->mm_private; |
| 516 | ret = 0; |
| 517 | |
| 518 | obj->map_list.key = alloc_unr(mm->idxunr); |
| 519 | ret = drm_ht_insert_item(&mm->offset_hash, &obj->map_list); |
| 520 | if (ret != 0) { |
| 521 | DRM_ERROR("failed to add to map hash\n"); |
| 522 | free_unr(mm->idxunr, obj->map_list.key); |
| 523 | return (ret); |
| 524 | } |
| 525 | obj->on_map = true; |
| 526 | return (0); |
| 527 | } |
| 528 | |
| 529 | void |
| 530 | drm_gem_free_mmap_offset(struct drm_gem_object *obj) |
| 531 | { |
| 532 | struct drm_hash_item *list; |
| 533 | struct drm_gem_mm *mm; |
| 534 | |
| 535 | if (!obj->on_map) |
| 536 | return; |
| 537 | mm = obj->dev->mm_private; |
| 538 | list = &obj->map_list; |
| 539 | |
| 540 | drm_ht_remove_item(&mm->offset_hash, list); |
| 541 | free_unr(mm->idxunr, list->key); |
| 542 | obj->on_map = false; |
| 543 | } |
| 544 | |
| 545 | int |
| 546 | drm_gem_mmap_single(struct drm_device *dev, vm_ooffset_t *offset, vm_size_t size, |
| 547 | struct vm_object **obj_res, int nprot) |
| 548 | { |
| 549 | struct drm_gem_object *gem_obj; |
| 550 | struct vm_object *vm_obj; |
| 551 | |
| 552 | DRM_LOCK(dev); |
| 553 | gem_obj = drm_gem_object_from_offset(dev, *offset); |
| 554 | if (gem_obj == NULL) { |
| 555 | DRM_UNLOCK(dev); |
| 556 | return (ENODEV); |
| 557 | } |
| 558 | drm_gem_object_reference(gem_obj); |
| 559 | DRM_UNLOCK(dev); |
| 560 | vm_obj = cdev_pager_allocate(gem_obj, OBJT_MGTDEVICE, |
| 561 | dev->driver->gem_pager_ops, size, nprot, |
| 562 | DRM_GEM_MAPPING_MAPOFF(*offset), curthread->td_ucred); |
| 563 | if (vm_obj == NULL) { |
| 564 | drm_gem_object_unreference_unlocked(gem_obj); |
| 565 | return (EINVAL); |
| 566 | } |
| 567 | *offset = DRM_GEM_MAPPING_MAPOFF(*offset); |
| 568 | *obj_res = vm_obj; |
| 569 | return (0); |
| 570 | } |
| 571 | |
| 572 | void |
| 573 | drm_gem_pager_dtr(void *handle) |
| 574 | { |
| 575 | struct drm_gem_object *obj; |
| 576 | struct drm_device *dev; |
| 577 | |
| 578 | obj = handle; |
| 579 | dev = obj->dev; |
| 580 | |
| 581 | DRM_LOCK(dev); |
| 582 | drm_gem_free_mmap_offset(obj); |
| 583 | drm_gem_object_unreference(obj); |
| 584 | DRM_UNLOCK(dev); |
| 585 | } |