ttm_object.c revision c66f854338253e603a4fb6817069ee23eacf0ae3
1/************************************************************************** 2 * 3 * Copyright (c) 2009-2013 VMware, Inc., Palo Alto, CA., USA 4 * All Rights Reserved. 5 * 6 * Permission is hereby granted, free of charge, to any person obtaining a 7 * copy of this software and associated documentation files (the 8 * "Software"), to deal in the Software without restriction, including 9 * without limitation the rights to use, copy, modify, merge, publish, 10 * distribute, sub license, and/or sell copies of the Software, and to 11 * permit persons to whom the Software is furnished to do so, subject to 12 * the following conditions: 13 * 14 * The above copyright notice and this permission notice (including the 15 * next paragraph) shall be included in all copies or substantial portions 16 * of the Software. 17 * 18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 19 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 20 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL 21 * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, 22 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR 23 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE 24 * USE OR OTHER DEALINGS IN THE SOFTWARE. 25 * 26 **************************************************************************/ 27/* 28 * Authors: Thomas Hellstrom <thellstrom-at-vmware-dot-com> 29 * 30 * While no substantial code is shared, the prime code is inspired by 31 * drm_prime.c, with 32 * Authors: 33 * Dave Airlie <airlied@redhat.com> 34 * Rob Clark <rob.clark@linaro.org> 35 */ 36/** @file ttm_ref_object.c 37 * 38 * Base- and reference object implementation for the various 39 * ttm objects. Implements reference counting, minimal security checks 40 * and release on file close. 41 */ 42 43 44/** 45 * struct ttm_object_file 46 * 47 * @tdev: Pointer to the ttm_object_device. 48 * 49 * @lock: Lock that protects the ref_list list and the 50 * ref_hash hash tables. 51 * 52 * @ref_list: List of ttm_ref_objects to be destroyed at 53 * file release. 54 * 55 * @ref_hash: Hash tables of ref objects, one per ttm_ref_type, 56 * for fast lookup of ref objects given a base object. 57 */ 58 59#define pr_fmt(fmt) "[TTM] " fmt 60 61#include <drm/ttm/ttm_object.h> 62#include <drm/ttm/ttm_module.h> 63#include <linux/list.h> 64#include <linux/spinlock.h> 65#include <linux/slab.h> 66#include <linux/module.h> 67#include <linux/atomic.h> 68 69struct ttm_object_file { 70 struct ttm_object_device *tdev; 71 spinlock_t lock; 72 struct list_head ref_list; 73 struct drm_open_hash ref_hash[TTM_REF_NUM]; 74 struct kref refcount; 75}; 76 77/** 78 * struct ttm_object_device 79 * 80 * @object_lock: lock that protects the object_hash hash table. 81 * 82 * @object_hash: hash table for fast lookup of object global names. 83 * 84 * @object_count: Per device object count. 85 * 86 * This is the per-device data structure needed for ttm object management. 87 */ 88 89struct ttm_object_device { 90 spinlock_t object_lock; 91 struct drm_open_hash object_hash; 92 atomic_t object_count; 93 struct ttm_mem_global *mem_glob; 94 struct dma_buf_ops ops; 95 void (*dmabuf_release)(struct dma_buf *dma_buf); 96 size_t dma_buf_size; 97}; 98 99/** 100 * struct ttm_ref_object 101 * 102 * @hash: Hash entry for the per-file object reference hash. 103 * 104 * @head: List entry for the per-file list of ref-objects. 105 * 106 * @kref: Ref count. 107 * 108 * @obj: Base object this ref object is referencing. 109 * 110 * @ref_type: Type of ref object. 111 * 112 * This is similar to an idr object, but it also has a hash table entry 113 * that allows lookup with a pointer to the referenced object as a key. In 114 * that way, one can easily detect whether a base object is referenced by 115 * a particular ttm_object_file. It also carries a ref count to avoid creating 116 * multiple ref objects if a ttm_object_file references the same base 117 * object more than once. 118 */ 119 120struct ttm_ref_object { 121 struct rcu_head rcu_head; 122 struct drm_hash_item hash; 123 struct list_head head; 124 struct kref kref; 125 enum ttm_ref_type ref_type; 126 struct ttm_base_object *obj; 127 struct ttm_object_file *tfile; 128}; 129 130static void ttm_prime_dmabuf_release(struct dma_buf *dma_buf); 131 132static inline struct ttm_object_file * 133ttm_object_file_ref(struct ttm_object_file *tfile) 134{ 135 kref_get(&tfile->refcount); 136 return tfile; 137} 138 139static void ttm_object_file_destroy(struct kref *kref) 140{ 141 struct ttm_object_file *tfile = 142 container_of(kref, struct ttm_object_file, refcount); 143 144 kfree(tfile); 145} 146 147 148static inline void ttm_object_file_unref(struct ttm_object_file **p_tfile) 149{ 150 struct ttm_object_file *tfile = *p_tfile; 151 152 *p_tfile = NULL; 153 kref_put(&tfile->refcount, ttm_object_file_destroy); 154} 155 156 157int ttm_base_object_init(struct ttm_object_file *tfile, 158 struct ttm_base_object *base, 159 bool shareable, 160 enum ttm_object_type object_type, 161 void (*refcount_release) (struct ttm_base_object **), 162 void (*ref_obj_release) (struct ttm_base_object *, 163 enum ttm_ref_type ref_type)) 164{ 165 struct ttm_object_device *tdev = tfile->tdev; 166 int ret; 167 168 base->shareable = shareable; 169 base->tfile = ttm_object_file_ref(tfile); 170 base->refcount_release = refcount_release; 171 base->ref_obj_release = ref_obj_release; 172 base->object_type = object_type; 173 kref_init(&base->refcount); 174 spin_lock(&tdev->object_lock); 175 ret = drm_ht_just_insert_please_rcu(&tdev->object_hash, 176 &base->hash, 177 (unsigned long)base, 31, 0, 0); 178 spin_unlock(&tdev->object_lock); 179 if (unlikely(ret != 0)) 180 goto out_err0; 181 182 ret = ttm_ref_object_add(tfile, base, TTM_REF_USAGE, NULL); 183 if (unlikely(ret != 0)) 184 goto out_err1; 185 186 ttm_base_object_unref(&base); 187 188 return 0; 189out_err1: 190 spin_lock(&tdev->object_lock); 191 (void)drm_ht_remove_item_rcu(&tdev->object_hash, &base->hash); 192 spin_unlock(&tdev->object_lock); 193out_err0: 194 return ret; 195} 196EXPORT_SYMBOL(ttm_base_object_init); 197 198static void ttm_release_base(struct kref *kref) 199{ 200 struct ttm_base_object *base = 201 container_of(kref, struct ttm_base_object, refcount); 202 struct ttm_object_device *tdev = base->tfile->tdev; 203 204 spin_lock(&tdev->object_lock); 205 (void)drm_ht_remove_item_rcu(&tdev->object_hash, &base->hash); 206 spin_unlock(&tdev->object_lock); 207 208 /* 209 * Note: We don't use synchronize_rcu() here because it's far 210 * too slow. It's up to the user to free the object using 211 * call_rcu() or ttm_base_object_kfree(). 212 */ 213 214 ttm_object_file_unref(&base->tfile); 215 if (base->refcount_release) 216 base->refcount_release(&base); 217} 218 219void ttm_base_object_unref(struct ttm_base_object **p_base) 220{ 221 struct ttm_base_object *base = *p_base; 222 223 *p_base = NULL; 224 225 kref_put(&base->refcount, ttm_release_base); 226} 227EXPORT_SYMBOL(ttm_base_object_unref); 228 229struct ttm_base_object *ttm_base_object_lookup(struct ttm_object_file *tfile, 230 uint32_t key) 231{ 232 struct ttm_base_object *base = NULL; 233 struct drm_hash_item *hash; 234 struct drm_open_hash *ht = &tfile->ref_hash[TTM_REF_USAGE]; 235 int ret; 236 237 rcu_read_lock(); 238 ret = drm_ht_find_item_rcu(ht, key, &hash); 239 240 if (likely(ret == 0)) { 241 base = drm_hash_entry(hash, struct ttm_ref_object, hash)->obj; 242 if (!kref_get_unless_zero(&base->refcount)) 243 base = NULL; 244 } 245 rcu_read_unlock(); 246 247 return base; 248} 249EXPORT_SYMBOL(ttm_base_object_lookup); 250 251struct ttm_base_object * 252ttm_base_object_lookup_for_ref(struct ttm_object_device *tdev, uint32_t key) 253{ 254 struct ttm_base_object *base = NULL; 255 struct drm_hash_item *hash; 256 struct drm_open_hash *ht = &tdev->object_hash; 257 int ret; 258 259 rcu_read_lock(); 260 ret = drm_ht_find_item_rcu(ht, key, &hash); 261 262 if (likely(ret == 0)) { 263 base = drm_hash_entry(hash, struct ttm_base_object, hash); 264 if (!kref_get_unless_zero(&base->refcount)) 265 base = NULL; 266 } 267 rcu_read_unlock(); 268 269 return base; 270} 271EXPORT_SYMBOL(ttm_base_object_lookup_for_ref); 272 273int ttm_ref_object_add(struct ttm_object_file *tfile, 274 struct ttm_base_object *base, 275 enum ttm_ref_type ref_type, bool *existed) 276{ 277 struct drm_open_hash *ht = &tfile->ref_hash[ref_type]; 278 struct ttm_ref_object *ref; 279 struct drm_hash_item *hash; 280 struct ttm_mem_global *mem_glob = tfile->tdev->mem_glob; 281 int ret = -EINVAL; 282 283 if (base->tfile != tfile && !base->shareable) 284 return -EPERM; 285 286 if (existed != NULL) 287 *existed = true; 288 289 while (ret == -EINVAL) { 290 rcu_read_lock(); 291 ret = drm_ht_find_item_rcu(ht, base->hash.key, &hash); 292 293 if (ret == 0) { 294 ref = drm_hash_entry(hash, struct ttm_ref_object, hash); 295 if (kref_get_unless_zero(&ref->kref)) { 296 rcu_read_unlock(); 297 break; 298 } 299 } 300 301 rcu_read_unlock(); 302 ret = ttm_mem_global_alloc(mem_glob, sizeof(*ref), 303 false, false); 304 if (unlikely(ret != 0)) 305 return ret; 306 ref = kmalloc(sizeof(*ref), GFP_KERNEL); 307 if (unlikely(ref == NULL)) { 308 ttm_mem_global_free(mem_glob, sizeof(*ref)); 309 return -ENOMEM; 310 } 311 312 ref->hash.key = base->hash.key; 313 ref->obj = base; 314 ref->tfile = tfile; 315 ref->ref_type = ref_type; 316 kref_init(&ref->kref); 317 318 spin_lock(&tfile->lock); 319 ret = drm_ht_insert_item_rcu(ht, &ref->hash); 320 321 if (likely(ret == 0)) { 322 list_add_tail(&ref->head, &tfile->ref_list); 323 kref_get(&base->refcount); 324 spin_unlock(&tfile->lock); 325 if (existed != NULL) 326 *existed = false; 327 break; 328 } 329 330 spin_unlock(&tfile->lock); 331 BUG_ON(ret != -EINVAL); 332 333 ttm_mem_global_free(mem_glob, sizeof(*ref)); 334 kfree(ref); 335 } 336 337 return ret; 338} 339EXPORT_SYMBOL(ttm_ref_object_add); 340 341static void ttm_ref_object_release(struct kref *kref) 342{ 343 struct ttm_ref_object *ref = 344 container_of(kref, struct ttm_ref_object, kref); 345 struct ttm_base_object *base = ref->obj; 346 struct ttm_object_file *tfile = ref->tfile; 347 struct drm_open_hash *ht; 348 struct ttm_mem_global *mem_glob = tfile->tdev->mem_glob; 349 350 ht = &tfile->ref_hash[ref->ref_type]; 351 (void)drm_ht_remove_item_rcu(ht, &ref->hash); 352 list_del(&ref->head); 353 spin_unlock(&tfile->lock); 354 355 if (ref->ref_type != TTM_REF_USAGE && base->ref_obj_release) 356 base->ref_obj_release(base, ref->ref_type); 357 358 ttm_base_object_unref(&ref->obj); 359 ttm_mem_global_free(mem_glob, sizeof(*ref)); 360 kfree_rcu(ref, rcu_head); 361 spin_lock(&tfile->lock); 362} 363 364int ttm_ref_object_base_unref(struct ttm_object_file *tfile, 365 unsigned long key, enum ttm_ref_type ref_type) 366{ 367 struct drm_open_hash *ht = &tfile->ref_hash[ref_type]; 368 struct ttm_ref_object *ref; 369 struct drm_hash_item *hash; 370 int ret; 371 372 spin_lock(&tfile->lock); 373 ret = drm_ht_find_item(ht, key, &hash); 374 if (unlikely(ret != 0)) { 375 spin_unlock(&tfile->lock); 376 return -EINVAL; 377 } 378 ref = drm_hash_entry(hash, struct ttm_ref_object, hash); 379 kref_put(&ref->kref, ttm_ref_object_release); 380 spin_unlock(&tfile->lock); 381 return 0; 382} 383EXPORT_SYMBOL(ttm_ref_object_base_unref); 384 385void ttm_object_file_release(struct ttm_object_file **p_tfile) 386{ 387 struct ttm_ref_object *ref; 388 struct list_head *list; 389 unsigned int i; 390 struct ttm_object_file *tfile = *p_tfile; 391 392 *p_tfile = NULL; 393 spin_lock(&tfile->lock); 394 395 /* 396 * Since we release the lock within the loop, we have to 397 * restart it from the beginning each time. 398 */ 399 400 while (!list_empty(&tfile->ref_list)) { 401 list = tfile->ref_list.next; 402 ref = list_entry(list, struct ttm_ref_object, head); 403 ttm_ref_object_release(&ref->kref); 404 } 405 406 for (i = 0; i < TTM_REF_NUM; ++i) 407 drm_ht_remove(&tfile->ref_hash[i]); 408 409 spin_unlock(&tfile->lock); 410 ttm_object_file_unref(&tfile); 411} 412EXPORT_SYMBOL(ttm_object_file_release); 413 414struct ttm_object_file *ttm_object_file_init(struct ttm_object_device *tdev, 415 unsigned int hash_order) 416{ 417 struct ttm_object_file *tfile = kmalloc(sizeof(*tfile), GFP_KERNEL); 418 unsigned int i; 419 unsigned int j = 0; 420 int ret; 421 422 if (unlikely(tfile == NULL)) 423 return NULL; 424 425 spin_lock_init(&tfile->lock); 426 tfile->tdev = tdev; 427 kref_init(&tfile->refcount); 428 INIT_LIST_HEAD(&tfile->ref_list); 429 430 for (i = 0; i < TTM_REF_NUM; ++i) { 431 ret = drm_ht_create(&tfile->ref_hash[i], hash_order); 432 if (ret) { 433 j = i; 434 goto out_err; 435 } 436 } 437 438 return tfile; 439out_err: 440 for (i = 0; i < j; ++i) 441 drm_ht_remove(&tfile->ref_hash[i]); 442 443 kfree(tfile); 444 445 return NULL; 446} 447EXPORT_SYMBOL(ttm_object_file_init); 448 449struct ttm_object_device * 450ttm_object_device_init(struct ttm_mem_global *mem_glob, 451 unsigned int hash_order, 452 const struct dma_buf_ops *ops) 453{ 454 struct ttm_object_device *tdev = kmalloc(sizeof(*tdev), GFP_KERNEL); 455 int ret; 456 457 if (unlikely(tdev == NULL)) 458 return NULL; 459 460 tdev->mem_glob = mem_glob; 461 spin_lock_init(&tdev->object_lock); 462 atomic_set(&tdev->object_count, 0); 463 ret = drm_ht_create(&tdev->object_hash, hash_order); 464 if (ret != 0) 465 goto out_no_object_hash; 466 467 tdev->ops = *ops; 468 tdev->dmabuf_release = tdev->ops.release; 469 tdev->ops.release = ttm_prime_dmabuf_release; 470 tdev->dma_buf_size = ttm_round_pot(sizeof(struct dma_buf)) + 471 ttm_round_pot(sizeof(struct file)); 472 return tdev; 473 474out_no_object_hash: 475 kfree(tdev); 476 return NULL; 477} 478EXPORT_SYMBOL(ttm_object_device_init); 479 480void ttm_object_device_release(struct ttm_object_device **p_tdev) 481{ 482 struct ttm_object_device *tdev = *p_tdev; 483 484 *p_tdev = NULL; 485 486 spin_lock(&tdev->object_lock); 487 drm_ht_remove(&tdev->object_hash); 488 spin_unlock(&tdev->object_lock); 489 490 kfree(tdev); 491} 492EXPORT_SYMBOL(ttm_object_device_release); 493 494/** 495 * get_dma_buf_unless_doomed - get a dma_buf reference if possible. 496 * 497 * @dma_buf: Non-refcounted pointer to a struct dma-buf. 498 * 499 * Obtain a file reference from a lookup structure that doesn't refcount 500 * the file, but synchronizes with its release method to make sure it has 501 * not been freed yet. See for example kref_get_unless_zero documentation. 502 * Returns true if refcounting succeeds, false otherwise. 503 * 504 * Nobody really wants this as a public API yet, so let it mature here 505 * for some time... 506 */ 507static bool __must_check get_dma_buf_unless_doomed(struct dma_buf *dmabuf) 508{ 509 return atomic_long_inc_not_zero(&dmabuf->file->f_count) != 0L; 510} 511 512/** 513 * ttm_prime_refcount_release - refcount release method for a prime object. 514 * 515 * @p_base: Pointer to ttm_base_object pointer. 516 * 517 * This is a wrapper that calls the refcount_release founction of the 518 * underlying object. At the same time it cleans up the prime object. 519 * This function is called when all references to the base object we 520 * derive from are gone. 521 */ 522static void ttm_prime_refcount_release(struct ttm_base_object **p_base) 523{ 524 struct ttm_base_object *base = *p_base; 525 struct ttm_prime_object *prime; 526 527 *p_base = NULL; 528 prime = container_of(base, struct ttm_prime_object, base); 529 BUG_ON(prime->dma_buf != NULL); 530 mutex_destroy(&prime->mutex); 531 if (prime->refcount_release) 532 prime->refcount_release(&base); 533} 534 535/** 536 * ttm_prime_dmabuf_release - Release method for the dma-bufs we export 537 * 538 * @dma_buf: 539 * 540 * This function first calls the dma_buf release method the driver 541 * provides. Then it cleans up our dma_buf pointer used for lookup, 542 * and finally releases the reference the dma_buf has on our base 543 * object. 544 */ 545static void ttm_prime_dmabuf_release(struct dma_buf *dma_buf) 546{ 547 struct ttm_prime_object *prime = 548 (struct ttm_prime_object *) dma_buf->priv; 549 struct ttm_base_object *base = &prime->base; 550 struct ttm_object_device *tdev = base->tfile->tdev; 551 552 if (tdev->dmabuf_release) 553 tdev->dmabuf_release(dma_buf); 554 mutex_lock(&prime->mutex); 555 if (prime->dma_buf == dma_buf) 556 prime->dma_buf = NULL; 557 mutex_unlock(&prime->mutex); 558 ttm_mem_global_free(tdev->mem_glob, tdev->dma_buf_size); 559 ttm_base_object_unref(&base); 560} 561 562/** 563 * ttm_prime_fd_to_handle - Get a base object handle from a prime fd 564 * 565 * @tfile: A struct ttm_object_file identifying the caller. 566 * @fd: The prime / dmabuf fd. 567 * @handle: The returned handle. 568 * 569 * This function returns a handle to an object that previously exported 570 * a dma-buf. Note that we don't handle imports yet, because we simply 571 * have no consumers of that implementation. 572 */ 573int ttm_prime_fd_to_handle(struct ttm_object_file *tfile, 574 int fd, u32 *handle) 575{ 576 struct ttm_object_device *tdev = tfile->tdev; 577 struct dma_buf *dma_buf; 578 struct ttm_prime_object *prime; 579 struct ttm_base_object *base; 580 int ret; 581 582 dma_buf = dma_buf_get(fd); 583 if (IS_ERR(dma_buf)) 584 return PTR_ERR(dma_buf); 585 586 if (dma_buf->ops != &tdev->ops) 587 return -ENOSYS; 588 589 prime = (struct ttm_prime_object *) dma_buf->priv; 590 base = &prime->base; 591 *handle = base->hash.key; 592 ret = ttm_ref_object_add(tfile, base, TTM_REF_USAGE, NULL); 593 594 dma_buf_put(dma_buf); 595 596 return ret; 597} 598EXPORT_SYMBOL_GPL(ttm_prime_fd_to_handle); 599 600/** 601 * ttm_prime_handle_to_fd - Return a dma_buf fd from a ttm prime object 602 * 603 * @tfile: Struct ttm_object_file identifying the caller. 604 * @handle: Handle to the object we're exporting from. 605 * @flags: flags for dma-buf creation. We just pass them on. 606 * @prime_fd: The returned file descriptor. 607 * 608 */ 609int ttm_prime_handle_to_fd(struct ttm_object_file *tfile, 610 uint32_t handle, uint32_t flags, 611 int *prime_fd) 612{ 613 struct ttm_object_device *tdev = tfile->tdev; 614 struct ttm_base_object *base; 615 struct dma_buf *dma_buf; 616 struct ttm_prime_object *prime; 617 int ret; 618 619 base = ttm_base_object_lookup(tfile, handle); 620 if (unlikely(base == NULL || 621 base->object_type != ttm_prime_type)) { 622 ret = -ENOENT; 623 goto out_unref; 624 } 625 626 prime = container_of(base, struct ttm_prime_object, base); 627 if (unlikely(!base->shareable)) { 628 ret = -EPERM; 629 goto out_unref; 630 } 631 632 ret = mutex_lock_interruptible(&prime->mutex); 633 if (unlikely(ret != 0)) { 634 ret = -ERESTARTSYS; 635 goto out_unref; 636 } 637 638 dma_buf = prime->dma_buf; 639 if (!dma_buf || !get_dma_buf_unless_doomed(dma_buf)) { 640 641 /* 642 * Need to create a new dma_buf, with memory accounting. 643 */ 644 ret = ttm_mem_global_alloc(tdev->mem_glob, tdev->dma_buf_size, 645 false, true); 646 if (unlikely(ret != 0)) { 647 mutex_unlock(&prime->mutex); 648 goto out_unref; 649 } 650 651 dma_buf = dma_buf_export(prime, &tdev->ops, 652 prime->size, flags); 653 if (IS_ERR(dma_buf)) { 654 ret = PTR_ERR(dma_buf); 655 ttm_mem_global_free(tdev->mem_glob, 656 tdev->dma_buf_size); 657 mutex_unlock(&prime->mutex); 658 goto out_unref; 659 } 660 661 /* 662 * dma_buf has taken the base object reference 663 */ 664 base = NULL; 665 prime->dma_buf = dma_buf; 666 } 667 mutex_unlock(&prime->mutex); 668 669 ret = dma_buf_fd(dma_buf, flags); 670 if (ret >= 0) { 671 *prime_fd = ret; 672 ret = 0; 673 } else 674 dma_buf_put(dma_buf); 675 676out_unref: 677 if (base) 678 ttm_base_object_unref(&base); 679 return ret; 680} 681EXPORT_SYMBOL_GPL(ttm_prime_handle_to_fd); 682 683/** 684 * ttm_prime_object_init - Initialize a ttm_prime_object 685 * 686 * @tfile: struct ttm_object_file identifying the caller 687 * @size: The size of the dma_bufs we export. 688 * @prime: The object to be initialized. 689 * @shareable: See ttm_base_object_init 690 * @type: See ttm_base_object_init 691 * @refcount_release: See ttm_base_object_init 692 * @ref_obj_release: See ttm_base_object_init 693 * 694 * Initializes an object which is compatible with the drm_prime model 695 * for data sharing between processes and devices. 696 */ 697int ttm_prime_object_init(struct ttm_object_file *tfile, size_t size, 698 struct ttm_prime_object *prime, bool shareable, 699 enum ttm_object_type type, 700 void (*refcount_release) (struct ttm_base_object **), 701 void (*ref_obj_release) (struct ttm_base_object *, 702 enum ttm_ref_type ref_type)) 703{ 704 mutex_init(&prime->mutex); 705 prime->size = PAGE_ALIGN(size); 706 prime->real_type = type; 707 prime->dma_buf = NULL; 708 prime->refcount_release = refcount_release; 709 return ttm_base_object_init(tfile, &prime->base, shareable, 710 ttm_prime_type, 711 ttm_prime_refcount_release, 712 ref_obj_release); 713} 714EXPORT_SYMBOL(ttm_prime_object_init); 715