1 /* 2 * Copyright © 2008 Intel Corporation 3 * 4 * Permission is hereby granted, free of charge, to any person obtaining a 5 * copy of this software and associated documentation files (the "Software"), 6 * to deal in the Software without restriction, including without limitation 7 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 8 * and/or sell copies of the Software, and to permit persons to whom the 9 * Software is furnished to do so, subject to the following conditions: 10 * 11 * The above copyright notice and this permission notice (including the next 12 * paragraph) shall be included in all copies or substantial portions of the 13 * Software. 14 * 15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS 21 * IN THE SOFTWARE. 22 * 23 * Authors: 24 * Eric Anholt <eric@anholt.net> 25 * 26 */ 27 /*- 28 * Copyright (c) 2011 The FreeBSD Foundation 29 * All rights reserved. 30 * 31 * This software was developed by Konstantin Belousov under sponsorship from 32 * the FreeBSD Foundation. 33 * 34 * Redistribution and use in source and binary forms, with or without 35 * modification, are permitted provided that the following conditions 36 * are met: 37 * 1. Redistributions of source code must retain the above copyright 38 * notice, this list of conditions and the following disclaimer. 39 * 2. Redistributions in binary form must reproduce the above copyright 40 * notice, this list of conditions and the following disclaimer in the 41 * documentation and/or other materials provided with the distribution. 42 * 43 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 44 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 45 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 46 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 47 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 48 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 49 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 50 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 51 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 52 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 53 * SUCH DAMAGE. 54 */ 55 56 #include "opt_vm.h" 57 58 #include <sys/param.h> 59 #include <sys/systm.h> 60 #include <sys/limits.h> 61 #include <sys/lock.h> 62 #include <sys/mutex.h> 63 #include <sys/conf.h> 64 65 #include <vm/vm.h> 66 #include <vm/vm_page.h> 67 68 #include <linux/types.h> 69 #include <linux/mm.h> 70 #include <linux/module.h> 71 #include <drm/drmP.h> 72 #include <drm/drm_vma_manager.h> 73 #include <drm/drm_gem.h> 74 #include "drm_internal.h" 75 76 /** @file drm_gem.c 77 * 78 * This file provides some of the base ioctls and library routines for 79 * the graphics memory manager implemented by each device driver. 80 * 81 * Because various devices have different requirements in terms of 82 * synchronization and migration strategies, implementing that is left up to 83 * the driver, and all that the general API provides should be generic -- 84 * allocating objects, reading/writing data with the cpu, freeing objects. 85 * Even there, platform-dependent optimizations for reading/writing data with 86 * the CPU mean we'll likely hook those out to driver-specific calls. However, 87 * the DRI2 implementation wants to have at least allocate/mmap be generic. 88 * 89 * The goal was to have swap-backed object allocation managed through 90 * struct file. However, file descriptors as handles to a struct file have 91 * two major failings: 92 * - Process limits prevent more than 1024 or so being used at a time by 93 * default. 94 * - Inability to allocate high fds will aggravate the X Server's select() 95 * handling, and likely that of many GL client applications as well. 96 * 97 * This led to a plan of using our own integer IDs (called handles, following 98 * DRM terminology) to mimic fds, and implement the fd syscalls we need as 99 * ioctls. The objects themselves will still include the struct file so 100 * that we can transition to fds if the required kernel infrastructure shows 101 * up at a later date, and as our interface with shmfs for memory allocation. 102 */ 103 104 /* 105 * We make up offsets for buffer objects so we can recognize them at 106 * mmap time. 107 */ 108 109 /* pgoff in mmap is an unsigned long, so we need to make sure that 110 * the faked up offset will fit 111 */ 112 113 #if BITS_PER_LONG == 64 114 #define DRM_FILE_PAGE_OFFSET_START ((0xFFFFFFFFUL >> PAGE_SHIFT) + 1) 115 #define DRM_FILE_PAGE_OFFSET_SIZE ((0xFFFFFFFFUL >> PAGE_SHIFT) * 16) 116 #else 117 #define DRM_FILE_PAGE_OFFSET_START ((0xFFFFFFFUL >> PAGE_SHIFT) + 1) 118 #define DRM_FILE_PAGE_OFFSET_SIZE ((0xFFFFFFFUL >> PAGE_SHIFT) * 16) 119 #endif 120 121 /** 122 * drm_gem_init - Initialize the GEM device fields 123 * @dev: drm_devic structure to initialize 124 */ 125 int 126 drm_gem_init(struct drm_device *dev) 127 { 128 struct drm_gem_mm *mm; 129 130 lockinit(&dev->object_name_lock, "objnam", 0, LK_CANRECURSE); 131 idr_init(&dev->object_name_idr); 132 133 mm = kzalloc(sizeof(struct drm_gem_mm), GFP_KERNEL); 134 if (!mm) { 135 DRM_ERROR("out of memory\n"); 136 return -ENOMEM; 137 } 138 139 dev->mm_private = mm; 140 141 if (drm_ht_create(&mm->offset_hash, 12)) { 142 kfree(mm); 143 return -ENOMEM; 144 } 145 146 mm->idxunr = new_unrhdr(0, DRM_GEM_MAX_IDX, NULL); 147 drm_mm_init(&mm->offset_manager, DRM_FILE_PAGE_OFFSET_START, 148 DRM_FILE_PAGE_OFFSET_SIZE); 149 drm_vma_offset_manager_init(&mm->vma_manager, 150 DRM_FILE_PAGE_OFFSET_START, 151 DRM_FILE_PAGE_OFFSET_SIZE); 152 153 return 0; 154 } 155 156 void 157 drm_gem_destroy(struct drm_device *dev) 158 { 159 struct drm_gem_mm *mm = dev->mm_private; 160 161 drm_mm_takedown(&mm->offset_manager); 162 drm_ht_remove(&mm->offset_hash); 163 164 drm_vma_offset_manager_destroy(&mm->vma_manager); 165 delete_unrhdr(mm->idxunr); 166 kfree(mm); 167 dev->mm_private = NULL; 168 } 169 170 /** 171 * Initialize an already allocated GEM object of the specified size with 172 * shmfs backing store. 173 */ 174 int drm_gem_object_init(struct drm_device *dev, 175 struct drm_gem_object *obj, size_t size) 176 { 177 drm_gem_private_object_init(dev, obj, size); 178 179 obj->vm_obj = default_pager_alloc(NULL, size, 180 VM_PROT_READ | VM_PROT_WRITE, 0); 181 182 return 0; 183 } 184 EXPORT_SYMBOL(drm_gem_object_init); 185 186 /** 187 * drm_gem_object_init - initialize an allocated private GEM object 188 * @dev: drm_device the object should be initialized for 189 * @obj: drm_gem_object to initialize 190 * @size: object size 191 * 192 * Initialize an already allocated GEM object of the specified size with 193 * no GEM provided backing store. Instead the caller is responsible for 194 * backing the object and handling it. 195 */ 196 void drm_gem_private_object_init(struct drm_device *dev, 197 struct drm_gem_object *obj, size_t size) 198 { 199 BUG_ON((size & (PAGE_SIZE - 1)) != 0); 200 201 obj->dev = dev; 202 obj->vm_obj = NULL; 203 204 kref_init(&obj->refcount); 205 obj->handle_count = 0; 206 obj->size = size; 207 drm_vma_node_reset(&obj->vma_node); 208 } 209 EXPORT_SYMBOL(drm_gem_private_object_init); 210 211 static void 212 drm_gem_remove_prime_handles(struct drm_gem_object *obj, struct drm_file *filp) 213 { 214 #if 0 215 if (obj->import_attach) { 216 drm_prime_remove_buf_handle(&filp->prime, 217 obj->import_attach->dmabuf); 218 } 219 if (obj->export_dma_buf) { 220 drm_prime_remove_buf_handle(&filp->prime, 221 obj->export_dma_buf); 222 } 223 #endif 224 } 225 226 static void drm_gem_object_ref_bug(struct kref *list_kref) 227 { 228 BUG(); 229 } 230 231 /** 232 * drm_gem_object_free - release resources bound to userspace handles 233 * @obj: GEM object to clean up. 234 * 235 * Called after the last handle to the object has been closed 236 * 237 * Removes any name for the object. Note that this must be 238 * called before drm_gem_object_free or we'll be touching 239 * freed memory 240 */ 241 static void drm_gem_object_handle_free(struct drm_gem_object *obj) 242 { 243 struct drm_device *dev = obj->dev; 244 245 /* Remove any name for this object */ 246 if (obj->name) { 247 idr_remove(&dev->object_name_idr, obj->name); 248 obj->name = 0; 249 /* 250 * The object name held a reference to this object, drop 251 * that now. 252 * 253 * This cannot be the last reference, since the handle holds one too. 254 */ 255 kref_put(&obj->refcount, drm_gem_object_ref_bug); 256 } 257 } 258 259 #if 0 260 static void drm_gem_object_exported_dma_buf_free(struct drm_gem_object *obj) 261 { 262 /* Unbreak the reference cycle if we have an exported dma_buf. */ 263 if (obj->dma_buf) { 264 dma_buf_put(obj->dma_buf); 265 obj->dma_buf = NULL; 266 } 267 } 268 #endif 269 270 static void 271 drm_gem_object_handle_unreference_unlocked(struct drm_gem_object *obj) 272 { 273 if (WARN_ON(obj->handle_count == 0)) 274 return; 275 276 /* 277 * Must bump handle count first as this may be the last 278 * ref, in which case the object would disappear before we 279 * checked for a name 280 */ 281 282 mutex_lock(&obj->dev->object_name_lock); 283 if (--obj->handle_count == 0) 284 drm_gem_object_handle_free(obj); 285 mutex_unlock(&obj->dev->object_name_lock); 286 287 drm_gem_object_unreference_unlocked(obj); 288 } 289 290 /** 291 * drm_gem_handle_delete - deletes the given file-private handle 292 * @filp: drm file-private structure to use for the handle look up 293 * @handle: userspace handle to delete 294 * 295 * Removes the GEM handle from the @filp lookup table and if this is the last 296 * handle also cleans up linked resources like GEM names. 297 */ 298 int 299 drm_gem_handle_delete(struct drm_file *filp, u32 handle) 300 { 301 struct drm_device *dev; 302 struct drm_gem_object *obj; 303 304 /* This is gross. The idr system doesn't let us try a delete and 305 * return an error code. It just spews if you fail at deleting. 306 * So, we have to grab a lock around finding the object and then 307 * doing the delete on it and dropping the refcount, or the user 308 * could race us to double-decrement the refcount and cause a 309 * use-after-free later. Given the frequency of our handle lookups, 310 * we may want to use ida for number allocation and a hash table 311 * for the pointers, anyway. 312 */ 313 lockmgr(&filp->table_lock, LK_EXCLUSIVE); 314 315 /* Check if we currently have a reference on the object */ 316 obj = idr_find(&filp->object_idr, handle); 317 if (obj == NULL) { 318 lockmgr(&filp->table_lock, LK_RELEASE); 319 return -EINVAL; 320 } 321 dev = obj->dev; 322 323 /* Release reference and decrement refcount. */ 324 idr_remove(&filp->object_idr, handle); 325 lockmgr(&filp->table_lock, LK_RELEASE); 326 327 drm_gem_remove_prime_handles(obj, filp); 328 329 if (dev->driver->gem_close_object) 330 dev->driver->gem_close_object(obj, filp); 331 drm_gem_object_handle_unreference_unlocked(obj); 332 333 return 0; 334 } 335 EXPORT_SYMBOL(drm_gem_handle_delete); 336 337 /** 338 * drm_gem_dumb_destroy - dumb fb callback helper for gem based drivers 339 * @file: drm file-private structure to remove the dumb handle from 340 * @dev: corresponding drm_device 341 * @handle: the dumb handle to remove 342 * 343 * This implements the ->dumb_destroy kms driver callback for drivers which use 344 * gem to manage their backing storage. 345 */ 346 int drm_gem_dumb_destroy(struct drm_file *file, 347 struct drm_device *dev, 348 uint32_t handle) 349 { 350 return drm_gem_handle_delete(file, handle); 351 } 352 EXPORT_SYMBOL(drm_gem_dumb_destroy); 353 354 /** 355 * drm_gem_handle_create_tail - internal functions to create a handle 356 * @file_priv: drm file-private structure to register the handle for 357 * @obj: object to register 358 * @handlep: pointer to return the created handle to the caller 359 * 360 * This expects the dev->object_name_lock to be held already and will drop it 361 * before returning. Used to avoid races in establishing new handles when 362 * importing an object from either an flink name or a dma-buf. 363 */ 364 int 365 drm_gem_handle_create_tail(struct drm_file *file_priv, 366 struct drm_gem_object *obj, 367 u32 *handlep) 368 { 369 struct drm_device *dev = obj->dev; 370 int ret; 371 372 WARN_ON(!mutex_is_locked(&dev->object_name_lock)); 373 374 /* 375 * Get the user-visible handle using idr. Preload and perform 376 * allocation under our spinlock. 377 */ 378 idr_preload(GFP_KERNEL); 379 lockmgr(&file_priv->table_lock, LK_EXCLUSIVE); 380 381 ret = idr_alloc(&file_priv->object_idr, obj, 1, 0, GFP_NOWAIT); 382 drm_gem_object_reference(obj); 383 obj->handle_count++; 384 lockmgr(&file_priv->table_lock, LK_RELEASE); 385 idr_preload_end(); 386 mutex_unlock(&dev->object_name_lock); 387 if (ret < 0) { 388 drm_gem_object_handle_unreference_unlocked(obj); 389 return ret; 390 } 391 *handlep = ret; 392 393 #if 0 394 ret = drm_vma_node_allow(&obj->vma_node, file_priv->filp); 395 if (ret) { 396 drm_gem_handle_delete(file_priv, *handlep); 397 return ret; 398 } 399 #endif 400 401 if (dev->driver->gem_open_object) { 402 ret = dev->driver->gem_open_object(obj, file_priv); 403 if (ret) { 404 drm_gem_handle_delete(file_priv, *handlep); 405 return ret; 406 } 407 } 408 409 return 0; 410 } 411 412 /** 413 * drm_gem_handle_create - create a gem handle for an object 414 * @file_priv: drm file-private structure to register the handle for 415 * @obj: object to register 416 * @handlep: pionter to return the created handle to the caller 417 * 418 * Create a handle for this object. This adds a handle reference 419 * to the object, which includes a regular reference count. Callers 420 * will likely want to dereference the object afterwards. 421 */ 422 int drm_gem_handle_create(struct drm_file *file_priv, 423 struct drm_gem_object *obj, 424 u32 *handlep) 425 { 426 mutex_lock(&obj->dev->object_name_lock); 427 428 return drm_gem_handle_create_tail(file_priv, obj, handlep); 429 } 430 EXPORT_SYMBOL(drm_gem_handle_create); 431 432 /** 433 * drm_gem_free_mmap_offset - release a fake mmap offset for an object 434 * @obj: obj in question 435 * 436 * This routine frees fake offsets allocated by drm_gem_create_mmap_offset(). 437 */ 438 void 439 drm_gem_free_mmap_offset(struct drm_gem_object *obj) 440 { 441 struct drm_device *dev = obj->dev; 442 struct drm_gem_mm *mm = dev->mm_private; 443 struct drm_hash_item *list; 444 445 if (!obj->on_map) 446 return; 447 list = &obj->map_list; 448 449 drm_ht_remove_item(&mm->offset_hash, list); 450 free_unr(mm->idxunr, list->key); 451 obj->on_map = false; 452 453 drm_vma_offset_remove(&mm->vma_manager, &obj->vma_node); 454 } 455 EXPORT_SYMBOL(drm_gem_free_mmap_offset); 456 457 /** 458 * drm_gem_create_mmap_offset_size - create a fake mmap offset for an object 459 * @obj: obj in question 460 * @size: the virtual size 461 * 462 * GEM memory mapping works by handing back to userspace a fake mmap offset 463 * it can use in a subsequent mmap(2) call. The DRM core code then looks 464 * up the object based on the offset and sets up the various memory mapping 465 * structures. 466 * 467 * This routine allocates and attaches a fake offset for @obj, in cases where 468 * the virtual size differs from the physical size (ie. obj->size). Otherwise 469 * just use drm_gem_create_mmap_offset(). 470 */ 471 int 472 drm_gem_create_mmap_offset_size(struct drm_gem_object *obj, size_t size) 473 { 474 struct drm_device *dev = obj->dev; 475 struct drm_gem_mm *mm = dev->mm_private; 476 int ret = 0; 477 478 if (obj->on_map) 479 return (0); 480 481 obj->map_list.key = alloc_unr(mm->idxunr); 482 ret = drm_ht_insert_item(&mm->offset_hash, &obj->map_list); 483 if (ret != 0) { 484 DRM_ERROR("failed to add to map hash\n"); 485 free_unr(mm->idxunr, obj->map_list.key); 486 return (ret); 487 } 488 obj->on_map = true; 489 return 0; 490 491 return drm_vma_offset_add(&mm->vma_manager, &obj->vma_node, 492 size / PAGE_SIZE); 493 } 494 EXPORT_SYMBOL(drm_gem_create_mmap_offset_size); 495 496 /** 497 * drm_gem_create_mmap_offset - create a fake mmap offset for an object 498 * @obj: obj in question 499 * 500 * GEM memory mapping works by handing back to userspace a fake mmap offset 501 * it can use in a subsequent mmap(2) call. The DRM core code then looks 502 * up the object based on the offset and sets up the various memory mapping 503 * structures. 504 * 505 * This routine allocates and attaches a fake offset for @obj. 506 */ 507 int drm_gem_create_mmap_offset(struct drm_gem_object *obj) 508 { 509 return drm_gem_create_mmap_offset_size(obj, obj->size); 510 } 511 EXPORT_SYMBOL(drm_gem_create_mmap_offset); 512 513 /** Returns a reference to the object named by the handle. */ 514 struct drm_gem_object * 515 drm_gem_object_lookup(struct drm_device *dev, struct drm_file *filp, 516 u32 handle) 517 { 518 struct drm_gem_object *obj; 519 520 lockmgr(&filp->table_lock, LK_EXCLUSIVE); 521 522 /* Check if we currently have a reference on the object */ 523 obj = idr_find(&filp->object_idr, handle); 524 if (obj == NULL) { 525 lockmgr(&filp->table_lock, LK_RELEASE); 526 return NULL; 527 } 528 529 drm_gem_object_reference(obj); 530 531 lockmgr(&filp->table_lock, LK_RELEASE); 532 533 return obj; 534 } 535 EXPORT_SYMBOL(drm_gem_object_lookup); 536 537 /** 538 * drm_gem_close_ioctl - implementation of the GEM_CLOSE ioctl 539 * @dev: drm_device 540 * @data: ioctl data 541 * @file_priv: drm file-private structure 542 * 543 * Releases the handle to an mm object. 544 */ 545 int 546 drm_gem_close_ioctl(struct drm_device *dev, void *data, 547 struct drm_file *file_priv) 548 { 549 struct drm_gem_close *args = data; 550 int ret; 551 552 if (!drm_core_check_feature(dev, DRIVER_GEM)) 553 return -ENODEV; 554 555 ret = drm_gem_handle_delete(file_priv, args->handle); 556 557 return ret; 558 } 559 560 /** 561 * Create a global name for an object, returning the name. 562 * 563 * Note that the name does not hold a reference; when the object 564 * is freed, the name goes away. 565 */ 566 int 567 drm_gem_flink_ioctl(struct drm_device *dev, void *data, 568 struct drm_file *file_priv) 569 { 570 struct drm_gem_flink *args = data; 571 struct drm_gem_object *obj; 572 int ret; 573 574 if (!drm_core_check_feature(dev, DRIVER_GEM)) 575 return -ENODEV; 576 577 obj = drm_gem_object_lookup(dev, file_priv, args->handle); 578 if (obj == NULL) 579 return -ENOENT; 580 581 idr_preload(GFP_KERNEL); 582 lockmgr(&dev->object_name_lock, LK_EXCLUSIVE); 583 /* prevent races with concurrent gem_close. */ 584 if (obj->handle_count == 0) { 585 ret = -ENOENT; 586 goto err; 587 } 588 589 if (!obj->name) { 590 ret = idr_alloc(&dev->object_name_idr, obj, 1, 0, GFP_NOWAIT); 591 if (ret < 0) 592 goto err; 593 594 obj->name = ret; 595 596 /* Allocate a reference for the name table. */ 597 drm_gem_object_reference(obj); 598 } 599 600 args->name = (uint64_t) obj->name; 601 ret = 0; 602 603 err: 604 lockmgr(&dev->object_name_lock, LK_RELEASE); 605 idr_preload_end(); 606 drm_gem_object_unreference_unlocked(obj); 607 return ret; 608 } 609 610 /** 611 * drm_gem_open - implementation of the GEM_OPEN ioctl 612 * @dev: drm_device 613 * @data: ioctl data 614 * @file_priv: drm file-private structure 615 * 616 * Open an object using the global name, returning a handle and the size. 617 * 618 * This handle (of course) holds a reference to the object, so the object 619 * will not go away until the handle is deleted. 620 */ 621 int 622 drm_gem_open_ioctl(struct drm_device *dev, void *data, 623 struct drm_file *file_priv) 624 { 625 struct drm_gem_open *args = data; 626 struct drm_gem_object *obj; 627 int ret; 628 u32 handle; 629 630 if (!drm_core_check_feature(dev, DRIVER_GEM)) 631 return -ENODEV; 632 633 lockmgr(&dev->object_name_lock, LK_EXCLUSIVE); 634 obj = idr_find(&dev->object_name_idr, (int) args->name); 635 if (obj) 636 drm_gem_object_reference(obj); 637 lockmgr(&dev->object_name_lock, LK_RELEASE); 638 if (!obj) 639 return -ENOENT; 640 641 ret = drm_gem_handle_create(file_priv, obj, &handle); 642 drm_gem_object_unreference_unlocked(obj); 643 if (ret) 644 return ret; 645 646 args->handle = handle; 647 args->size = obj->size; 648 649 return 0; 650 } 651 652 /** 653 * gem_gem_open - initalizes GEM file-private structures at devnode open time 654 * @dev: drm_device which is being opened by userspace 655 * @file_private: drm file-private structure to set up 656 * 657 * Called at device open time, sets up the structure for handling refcounting 658 * of mm objects. 659 */ 660 void 661 drm_gem_open(struct drm_device *dev, struct drm_file *file_private) 662 { 663 idr_init(&file_private->object_idr); 664 lockinit(&file_private->table_lock, "fptab", 0, LK_CANRECURSE); 665 } 666 667 /* 668 * Called at device close to release the file's 669 * handle references on objects. 670 */ 671 static int 672 drm_gem_object_release_handle(int id, void *ptr, void *data) 673 { 674 struct drm_file *file_priv = data; 675 struct drm_gem_object *obj = ptr; 676 struct drm_device *dev = obj->dev; 677 678 drm_gem_remove_prime_handles(obj, file_priv); 679 680 if (dev->driver->gem_close_object) 681 dev->driver->gem_close_object(obj, file_priv); 682 683 drm_gem_object_handle_unreference_unlocked(obj); 684 685 return 0; 686 } 687 688 /** 689 * drm_gem_release - release file-private GEM resources 690 * @dev: drm_device which is being closed by userspace 691 * @file_private: drm file-private structure to clean up 692 * 693 * Called at close time when the filp is going away. 694 * 695 * Releases any remaining references on objects by this filp. 696 */ 697 void 698 drm_gem_release(struct drm_device *dev, struct drm_file *file_private) 699 { 700 idr_for_each(&file_private->object_idr, 701 &drm_gem_object_release_handle, file_private); 702 idr_destroy(&file_private->object_idr); 703 } 704 705 void 706 drm_gem_object_release(struct drm_gem_object *obj) 707 { 708 709 /* 710 * obj->vm_obj can be NULL for private gem objects. 711 */ 712 vm_object_deallocate(obj->vm_obj); 713 } 714 EXPORT_SYMBOL(drm_gem_object_release); 715 716 /** 717 * drm_gem_object_free - free a GEM object 718 * @kref: kref of the object to free 719 * 720 * Called after the last reference to the object has been lost. 721 * Must be called holding struct_ mutex 722 * 723 * Frees the object 724 */ 725 void 726 drm_gem_object_free(struct kref *kref) 727 { 728 struct drm_gem_object *obj = (struct drm_gem_object *) kref; 729 struct drm_device *dev = obj->dev; 730 731 WARN_ON(!mutex_is_locked(&dev->struct_mutex)); 732 733 if (dev->driver->gem_free_object != NULL) 734 dev->driver->gem_free_object(obj); 735 } 736 EXPORT_SYMBOL(drm_gem_object_free); 737 738 static struct drm_gem_object * 739 drm_gem_object_from_offset(struct drm_device *dev, vm_ooffset_t offset) 740 { 741 struct drm_gem_object *obj; 742 struct drm_gem_mm *mm = dev->mm_private; 743 struct drm_hash_item *hash; 744 745 if ((offset & DRM_GEM_MAPPING_MASK) != DRM_GEM_MAPPING_KEY) 746 return (NULL); 747 offset &= ~DRM_GEM_MAPPING_KEY; 748 749 if (drm_ht_find_item(&mm->offset_hash, DRM_GEM_MAPPING_IDX(offset), 750 &hash) != 0) { 751 return (NULL); 752 } 753 obj = container_of(hash, struct drm_gem_object, map_list); 754 return (obj); 755 } 756 757 int 758 drm_gem_mmap_single(struct drm_device *dev, vm_ooffset_t *offset, vm_size_t size, 759 struct vm_object **obj_res, int nprot) 760 { 761 struct drm_gem_object *gem_obj; 762 struct vm_object *vm_obj; 763 764 DRM_LOCK(dev); 765 gem_obj = drm_gem_object_from_offset(dev, *offset); 766 if (gem_obj == NULL) { 767 DRM_UNLOCK(dev); 768 return (ENODEV); 769 } 770 771 drm_gem_object_reference(gem_obj); 772 DRM_UNLOCK(dev); 773 vm_obj = cdev_pager_allocate(gem_obj, OBJT_MGTDEVICE, 774 dev->driver->gem_pager_ops, size, nprot, 775 DRM_GEM_MAPPING_MAPOFF(*offset), curthread->td_ucred); 776 if (vm_obj == NULL) { 777 drm_gem_object_unreference_unlocked(gem_obj); 778 return (EINVAL); 779 } 780 *offset = DRM_GEM_MAPPING_MAPOFF(*offset); 781 *obj_res = vm_obj; 782 return (0); 783 } 784