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 which has been added with 296 * drm_gem_handle_create(). If this is the last handle also cleans up linked 297 * resources like GEM names. 298 */ 299 int 300 drm_gem_handle_delete(struct drm_file *filp, u32 handle) 301 { 302 struct drm_device *dev; 303 struct drm_gem_object *obj; 304 305 /* This is gross. The idr system doesn't let us try a delete and 306 * return an error code. It just spews if you fail at deleting. 307 * So, we have to grab a lock around finding the object and then 308 * doing the delete on it and dropping the refcount, or the user 309 * could race us to double-decrement the refcount and cause a 310 * use-after-free later. Given the frequency of our handle lookups, 311 * we may want to use ida for number allocation and a hash table 312 * for the pointers, anyway. 313 */ 314 lockmgr(&filp->table_lock, LK_EXCLUSIVE); 315 316 /* Check if we currently have a reference on the object */ 317 obj = idr_find(&filp->object_idr, handle); 318 if (obj == NULL) { 319 lockmgr(&filp->table_lock, LK_RELEASE); 320 return -EINVAL; 321 } 322 dev = obj->dev; 323 324 /* Release reference and decrement refcount. */ 325 idr_remove(&filp->object_idr, handle); 326 lockmgr(&filp->table_lock, LK_RELEASE); 327 328 drm_gem_remove_prime_handles(obj, filp); 329 330 if (dev->driver->gem_close_object) 331 dev->driver->gem_close_object(obj, filp); 332 drm_gem_object_handle_unreference_unlocked(obj); 333 334 return 0; 335 } 336 EXPORT_SYMBOL(drm_gem_handle_delete); 337 338 /** 339 * drm_gem_dumb_destroy - dumb fb callback helper for gem based drivers 340 * @file: drm file-private structure to remove the dumb handle from 341 * @dev: corresponding drm_device 342 * @handle: the dumb handle to remove 343 * 344 * This implements the ->dumb_destroy kms driver callback for drivers which use 345 * gem to manage their backing storage. 346 */ 347 int drm_gem_dumb_destroy(struct drm_file *file, 348 struct drm_device *dev, 349 uint32_t handle) 350 { 351 return drm_gem_handle_delete(file, handle); 352 } 353 EXPORT_SYMBOL(drm_gem_dumb_destroy); 354 355 /** 356 * drm_gem_handle_create_tail - internal functions to create a handle 357 * @file_priv: drm file-private structure to register the handle for 358 * @obj: object to register 359 * @handlep: pointer to return the created handle to the caller 360 * 361 * This expects the dev->object_name_lock to be held already and will drop it 362 * before returning. Used to avoid races in establishing new handles when 363 * importing an object from either an flink name or a dma-buf. 364 * 365 * Handles must be release again through drm_gem_handle_delete(). This is done 366 * when userspace closes @file_priv for all attached handles, or through the 367 * GEM_CLOSE ioctl for individual handles. 368 */ 369 int 370 drm_gem_handle_create_tail(struct drm_file *file_priv, 371 struct drm_gem_object *obj, 372 u32 *handlep) 373 { 374 struct drm_device *dev = obj->dev; 375 int ret; 376 377 *handlep = 0; /* whack gcc warning */ 378 WARN_ON(!mutex_is_locked(&dev->object_name_lock)); 379 380 /* 381 * Get the user-visible handle using idr. Preload and perform 382 * allocation under our spinlock. 383 */ 384 idr_preload(GFP_KERNEL); 385 lockmgr(&file_priv->table_lock, LK_EXCLUSIVE); 386 387 ret = idr_alloc(&file_priv->object_idr, obj, 1, 0, GFP_NOWAIT); 388 drm_gem_object_reference(obj); 389 obj->handle_count++; 390 lockmgr(&file_priv->table_lock, LK_RELEASE); 391 idr_preload_end(); 392 mutex_unlock(&dev->object_name_lock); 393 if (ret < 0) { 394 drm_gem_object_handle_unreference_unlocked(obj); 395 return ret; 396 } 397 *handlep = ret; 398 399 #if 0 400 ret = drm_vma_node_allow(&obj->vma_node, file_priv->filp); 401 if (ret) { 402 drm_gem_handle_delete(file_priv, *handlep); 403 return ret; 404 } 405 #endif 406 407 if (dev->driver->gem_open_object) { 408 ret = dev->driver->gem_open_object(obj, file_priv); 409 if (ret) { 410 drm_gem_handle_delete(file_priv, *handlep); 411 return ret; 412 } 413 } 414 415 return 0; 416 } 417 418 /** 419 * drm_gem_handle_create - create a gem handle for an object 420 * @file_priv: drm file-private structure to register the handle for 421 * @obj: object to register 422 * @handlep: pionter to return the created handle to the caller 423 * 424 * Create a handle for this object. This adds a handle reference 425 * to the object, which includes a regular reference count. Callers 426 * will likely want to dereference the object afterwards. 427 */ 428 int drm_gem_handle_create(struct drm_file *file_priv, 429 struct drm_gem_object *obj, 430 u32 *handlep) 431 { 432 mutex_lock(&obj->dev->object_name_lock); 433 434 return drm_gem_handle_create_tail(file_priv, obj, handlep); 435 } 436 EXPORT_SYMBOL(drm_gem_handle_create); 437 438 /** 439 * drm_gem_free_mmap_offset - release a fake mmap offset for an object 440 * @obj: obj in question 441 * 442 * This routine frees fake offsets allocated by drm_gem_create_mmap_offset(). 443 */ 444 void 445 drm_gem_free_mmap_offset(struct drm_gem_object *obj) 446 { 447 struct drm_device *dev = obj->dev; 448 struct drm_gem_mm *mm = dev->mm_private; 449 struct drm_hash_item *list; 450 451 if (!obj->on_map) 452 return; 453 list = &obj->map_list; 454 455 drm_ht_remove_item(&mm->offset_hash, list); 456 free_unr(mm->idxunr, list->key); 457 obj->on_map = false; 458 459 drm_vma_offset_remove(&mm->vma_manager, &obj->vma_node); 460 } 461 EXPORT_SYMBOL(drm_gem_free_mmap_offset); 462 463 /** 464 * drm_gem_create_mmap_offset_size - create a fake mmap offset for an object 465 * @obj: obj in question 466 * @size: the virtual size 467 * 468 * GEM memory mapping works by handing back to userspace a fake mmap offset 469 * it can use in a subsequent mmap(2) call. The DRM core code then looks 470 * up the object based on the offset and sets up the various memory mapping 471 * structures. 472 * 473 * This routine allocates and attaches a fake offset for @obj, in cases where 474 * the virtual size differs from the physical size (ie. obj->size). Otherwise 475 * just use drm_gem_create_mmap_offset(). 476 */ 477 int 478 drm_gem_create_mmap_offset_size(struct drm_gem_object *obj, size_t size) 479 { 480 struct drm_device *dev = obj->dev; 481 struct drm_gem_mm *mm = dev->mm_private; 482 int ret = 0; 483 484 if (obj->on_map) 485 return (0); 486 487 obj->map_list.key = alloc_unr(mm->idxunr); 488 ret = drm_ht_insert_item(&mm->offset_hash, &obj->map_list); 489 if (ret != 0) { 490 DRM_ERROR("failed to add to map hash\n"); 491 free_unr(mm->idxunr, obj->map_list.key); 492 return (ret); 493 } 494 obj->on_map = true; 495 return 0; 496 497 return drm_vma_offset_add(&mm->vma_manager, &obj->vma_node, 498 size / PAGE_SIZE); 499 } 500 EXPORT_SYMBOL(drm_gem_create_mmap_offset_size); 501 502 /** 503 * drm_gem_create_mmap_offset - create a fake mmap offset for an object 504 * @obj: obj in question 505 * 506 * GEM memory mapping works by handing back to userspace a fake mmap offset 507 * it can use in a subsequent mmap(2) call. The DRM core code then looks 508 * up the object based on the offset and sets up the various memory mapping 509 * structures. 510 * 511 * This routine allocates and attaches a fake offset for @obj. 512 */ 513 int drm_gem_create_mmap_offset(struct drm_gem_object *obj) 514 { 515 return drm_gem_create_mmap_offset_size(obj, obj->size); 516 } 517 EXPORT_SYMBOL(drm_gem_create_mmap_offset); 518 519 /** 520 * drm_gem_object_lookup - look up a GEM object from it's handle 521 * @dev: DRM device 522 * @filp: DRM file private date 523 * @handle: userspace handle 524 * 525 * Returns: 526 * 527 * A reference to the object named by the handle if such exists on @filp, NULL 528 * otherwise. 529 */ 530 struct drm_gem_object * 531 drm_gem_object_lookup(struct drm_device *dev, struct drm_file *filp, 532 u32 handle) 533 { 534 struct drm_gem_object *obj; 535 536 lockmgr(&filp->table_lock, LK_EXCLUSIVE); 537 538 /* Check if we currently have a reference on the object */ 539 obj = idr_find(&filp->object_idr, handle); 540 if (obj == NULL) { 541 lockmgr(&filp->table_lock, LK_RELEASE); 542 return NULL; 543 } 544 545 drm_gem_object_reference(obj); 546 547 lockmgr(&filp->table_lock, LK_RELEASE); 548 549 return obj; 550 } 551 EXPORT_SYMBOL(drm_gem_object_lookup); 552 553 /** 554 * drm_gem_close_ioctl - implementation of the GEM_CLOSE ioctl 555 * @dev: drm_device 556 * @data: ioctl data 557 * @file_priv: drm file-private structure 558 * 559 * Releases the handle to an mm object. 560 */ 561 int 562 drm_gem_close_ioctl(struct drm_device *dev, void *data, 563 struct drm_file *file_priv) 564 { 565 struct drm_gem_close *args = data; 566 int ret; 567 568 if (!drm_core_check_feature(dev, DRIVER_GEM)) 569 return -ENODEV; 570 571 ret = drm_gem_handle_delete(file_priv, args->handle); 572 573 return ret; 574 } 575 576 /** 577 * Create a global name for an object, returning the name. 578 * 579 * Note that the name does not hold a reference; when the object 580 * is freed, the name goes away. 581 */ 582 int 583 drm_gem_flink_ioctl(struct drm_device *dev, void *data, 584 struct drm_file *file_priv) 585 { 586 struct drm_gem_flink *args = data; 587 struct drm_gem_object *obj; 588 int ret; 589 590 if (!drm_core_check_feature(dev, DRIVER_GEM)) 591 return -ENODEV; 592 593 obj = drm_gem_object_lookup(dev, file_priv, args->handle); 594 if (obj == NULL) 595 return -ENOENT; 596 597 idr_preload(GFP_KERNEL); 598 lockmgr(&dev->object_name_lock, LK_EXCLUSIVE); 599 /* prevent races with concurrent gem_close. */ 600 if (obj->handle_count == 0) { 601 ret = -ENOENT; 602 goto err; 603 } 604 605 if (!obj->name) { 606 ret = idr_alloc(&dev->object_name_idr, obj, 1, 0, GFP_NOWAIT); 607 if (ret < 0) 608 goto err; 609 610 obj->name = ret; 611 612 /* Allocate a reference for the name table. */ 613 drm_gem_object_reference(obj); 614 } 615 616 args->name = (uint64_t) obj->name; 617 ret = 0; 618 619 err: 620 lockmgr(&dev->object_name_lock, LK_RELEASE); 621 idr_preload_end(); 622 drm_gem_object_unreference_unlocked(obj); 623 return ret; 624 } 625 626 /** 627 * drm_gem_open - implementation of the GEM_OPEN ioctl 628 * @dev: drm_device 629 * @data: ioctl data 630 * @file_priv: drm file-private structure 631 * 632 * Open an object using the global name, returning a handle and the size. 633 * 634 * This handle (of course) holds a reference to the object, so the object 635 * will not go away until the handle is deleted. 636 */ 637 int 638 drm_gem_open_ioctl(struct drm_device *dev, void *data, 639 struct drm_file *file_priv) 640 { 641 struct drm_gem_open *args = data; 642 struct drm_gem_object *obj; 643 int ret; 644 u32 handle; 645 646 if (!drm_core_check_feature(dev, DRIVER_GEM)) 647 return -ENODEV; 648 649 lockmgr(&dev->object_name_lock, LK_EXCLUSIVE); 650 obj = idr_find(&dev->object_name_idr, (int) args->name); 651 if (obj) 652 drm_gem_object_reference(obj); 653 lockmgr(&dev->object_name_lock, LK_RELEASE); 654 if (!obj) 655 return -ENOENT; 656 657 ret = drm_gem_handle_create(file_priv, obj, &handle); 658 drm_gem_object_unreference_unlocked(obj); 659 if (ret) 660 return ret; 661 662 args->handle = handle; 663 args->size = obj->size; 664 665 return 0; 666 } 667 668 /** 669 * gem_gem_open - initalizes GEM file-private structures at devnode open time 670 * @dev: drm_device which is being opened by userspace 671 * @file_private: drm file-private structure to set up 672 * 673 * Called at device open time, sets up the structure for handling refcounting 674 * of mm objects. 675 */ 676 void 677 drm_gem_open(struct drm_device *dev, struct drm_file *file_private) 678 { 679 idr_init(&file_private->object_idr); 680 lockinit(&file_private->table_lock, "fptab", 0, LK_CANRECURSE); 681 } 682 683 /* 684 * Called at device close to release the file's 685 * handle references on objects. 686 */ 687 static int 688 drm_gem_object_release_handle(int id, void *ptr, void *data) 689 { 690 struct drm_file *file_priv = data; 691 struct drm_gem_object *obj = ptr; 692 struct drm_device *dev = obj->dev; 693 694 drm_gem_remove_prime_handles(obj, file_priv); 695 696 if (dev->driver->gem_close_object) 697 dev->driver->gem_close_object(obj, file_priv); 698 699 drm_gem_object_handle_unreference_unlocked(obj); 700 701 return 0; 702 } 703 704 /** 705 * drm_gem_release - release file-private GEM resources 706 * @dev: drm_device which is being closed by userspace 707 * @file_private: drm file-private structure to clean up 708 * 709 * Called at close time when the filp is going away. 710 * 711 * Releases any remaining references on objects by this filp. 712 */ 713 void 714 drm_gem_release(struct drm_device *dev, struct drm_file *file_private) 715 { 716 idr_for_each(&file_private->object_idr, 717 &drm_gem_object_release_handle, file_private); 718 idr_destroy(&file_private->object_idr); 719 } 720 721 void 722 drm_gem_object_release(struct drm_gem_object *obj) 723 { 724 725 /* 726 * obj->vm_obj can be NULL for private gem objects. 727 */ 728 vm_object_deallocate(obj->vm_obj); 729 } 730 EXPORT_SYMBOL(drm_gem_object_release); 731 732 /** 733 * drm_gem_object_free - free a GEM object 734 * @kref: kref of the object to free 735 * 736 * Called after the last reference to the object has been lost. 737 * Must be called holding struct_ mutex 738 * 739 * Frees the object 740 */ 741 void 742 drm_gem_object_free(struct kref *kref) 743 { 744 struct drm_gem_object *obj = 745 container_of(kref, struct drm_gem_object, refcount); 746 struct drm_device *dev = obj->dev; 747 748 WARN_ON(!mutex_is_locked(&dev->struct_mutex)); 749 750 if (dev->driver->gem_free_object != NULL) 751 dev->driver->gem_free_object(obj); 752 } 753 EXPORT_SYMBOL(drm_gem_object_free); 754 755 static struct drm_gem_object * 756 drm_gem_object_from_offset(struct drm_device *dev, vm_ooffset_t offset) 757 { 758 struct drm_gem_object *obj; 759 struct drm_gem_mm *mm = dev->mm_private; 760 struct drm_hash_item *hash; 761 762 if ((offset & DRM_GEM_MAPPING_MASK) != DRM_GEM_MAPPING_KEY) 763 return (NULL); 764 offset &= ~DRM_GEM_MAPPING_KEY; 765 766 if (drm_ht_find_item(&mm->offset_hash, DRM_GEM_MAPPING_IDX(offset), 767 &hash) != 0) { 768 return (NULL); 769 } 770 obj = container_of(hash, struct drm_gem_object, map_list); 771 return (obj); 772 } 773 774 int 775 drm_gem_mmap_single(struct drm_device *dev, vm_ooffset_t *offset, vm_size_t size, 776 struct vm_object **obj_res, int nprot) 777 { 778 struct drm_gem_object *gem_obj; 779 struct vm_object *vm_obj; 780 781 DRM_LOCK(dev); 782 gem_obj = drm_gem_object_from_offset(dev, *offset); 783 if (gem_obj == NULL) { 784 DRM_UNLOCK(dev); 785 return (ENODEV); 786 } 787 788 drm_gem_object_reference(gem_obj); 789 DRM_UNLOCK(dev); 790 vm_obj = cdev_pager_allocate(gem_obj, OBJT_MGTDEVICE, 791 dev->driver->gem_pager_ops, size, nprot, 792 DRM_GEM_MAPPING_MAPOFF(*offset), curthread->td_ucred); 793 if (vm_obj == NULL) { 794 drm_gem_object_unreference_unlocked(gem_obj); 795 return (EINVAL); 796 } 797 *offset = DRM_GEM_MAPPING_MAPOFF(*offset); 798 *obj_res = vm_obj; 799 return (0); 800 } 801