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->filp = 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->filp = 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 /* 215 * Note: obj->dma_buf can't disappear as long as we still hold a 216 * handle reference in obj->handle_count. 217 */ 218 mutex_lock(&filp->prime.lock); 219 #if 0 220 if (obj->dma_buf) { 221 drm_prime_remove_buf_handle_locked(&filp->prime, 222 obj->dma_buf); 223 } 224 #endif 225 mutex_unlock(&filp->prime.lock); 226 } 227 228 /** 229 * drm_gem_object_handle_free - release resources bound to userspace handles 230 * @obj: GEM object to clean up. 231 * 232 * Called after the last handle to the object has been closed 233 * 234 * Removes any name for the object. Note that this must be 235 * called before drm_gem_object_free or we'll be touching 236 * freed memory 237 */ 238 static void drm_gem_object_handle_free(struct drm_gem_object *obj) 239 { 240 struct drm_device *dev = obj->dev; 241 242 /* Remove any name for this object */ 243 if (obj->name) { 244 idr_remove(&dev->object_name_idr, obj->name); 245 obj->name = 0; 246 } 247 } 248 249 static void drm_gem_object_exported_dma_buf_free(struct drm_gem_object *obj) 250 { 251 #if 0 252 /* Unbreak the reference cycle if we have an exported dma_buf. */ 253 if (obj->dma_buf) { 254 dma_buf_put(obj->dma_buf); 255 obj->dma_buf = NULL; 256 } 257 #endif 258 } 259 260 static void 261 drm_gem_object_handle_unreference_unlocked(struct drm_gem_object *obj) 262 { 263 struct drm_device *dev = obj->dev; 264 bool final = false; 265 266 if (WARN_ON(obj->handle_count == 0)) 267 return; 268 269 /* 270 * Must bump handle count first as this may be the last 271 * ref, in which case the object would disappear before we 272 * checked for a name 273 */ 274 275 mutex_lock(&dev->object_name_lock); 276 if (--obj->handle_count == 0) { 277 drm_gem_object_handle_free(obj); 278 drm_gem_object_exported_dma_buf_free(obj); 279 final = true; 280 } 281 mutex_unlock(&dev->object_name_lock); 282 283 if (final) 284 drm_gem_object_unreference_unlocked(obj); 285 } 286 287 /* 288 * Called at device or object close to release the file's 289 * handle references on objects. 290 */ 291 static int 292 drm_gem_object_release_handle(int id, void *ptr, void *data) 293 { 294 struct drm_file *file_priv = data; 295 struct drm_gem_object *obj = ptr; 296 struct drm_device *dev = obj->dev; 297 298 if (drm_core_check_feature(dev, DRIVER_PRIME)) 299 drm_gem_remove_prime_handles(obj, file_priv); 300 drm_vma_node_revoke(&obj->vma_node, file_priv->filp); 301 302 if (dev->driver->gem_close_object) 303 dev->driver->gem_close_object(obj, file_priv); 304 305 drm_gem_object_handle_unreference_unlocked(obj); 306 307 return 0; 308 } 309 310 /** 311 * drm_gem_handle_delete - deletes the given file-private handle 312 * @filp: drm file-private structure to use for the handle look up 313 * @handle: userspace handle to delete 314 * 315 * Removes the GEM handle from the @filp lookup table which has been added with 316 * drm_gem_handle_create(). If this is the last handle also cleans up linked 317 * resources like GEM names. 318 */ 319 int 320 drm_gem_handle_delete(struct drm_file *filp, u32 handle) 321 { 322 struct drm_device *dev; 323 struct drm_gem_object *obj; 324 325 /* This is gross. The idr system doesn't let us try a delete and 326 * return an error code. It just spews if you fail at deleting. 327 * So, we have to grab a lock around finding the object and then 328 * doing the delete on it and dropping the refcount, or the user 329 * could race us to double-decrement the refcount and cause a 330 * use-after-free later. Given the frequency of our handle lookups, 331 * we may want to use ida for number allocation and a hash table 332 * for the pointers, anyway. 333 */ 334 lockmgr(&filp->table_lock, LK_EXCLUSIVE); 335 336 /* Check if we currently have a reference on the object */ 337 obj = idr_find(&filp->object_idr, handle); 338 if (obj == NULL) { 339 lockmgr(&filp->table_lock, LK_RELEASE); 340 return -EINVAL; 341 } 342 dev = obj->dev; 343 344 /* Release reference and decrement refcount. */ 345 idr_remove(&filp->object_idr, handle); 346 lockmgr(&filp->table_lock, LK_RELEASE); 347 348 drm_gem_remove_prime_handles(obj, filp); 349 350 if (dev->driver->gem_close_object) 351 dev->driver->gem_close_object(obj, filp); 352 drm_gem_object_handle_unreference_unlocked(obj); 353 354 return 0; 355 } 356 EXPORT_SYMBOL(drm_gem_handle_delete); 357 358 /** 359 * drm_gem_dumb_destroy - dumb fb callback helper for gem based drivers 360 * @file: drm file-private structure to remove the dumb handle from 361 * @dev: corresponding drm_device 362 * @handle: the dumb handle to remove 363 * 364 * This implements the ->dumb_destroy kms driver callback for drivers which use 365 * gem to manage their backing storage. 366 */ 367 int drm_gem_dumb_destroy(struct drm_file *file, 368 struct drm_device *dev, 369 uint32_t handle) 370 { 371 return drm_gem_handle_delete(file, handle); 372 } 373 EXPORT_SYMBOL(drm_gem_dumb_destroy); 374 375 /** 376 * drm_gem_handle_create_tail - internal functions to create a handle 377 * @file_priv: drm file-private structure to register the handle for 378 * @obj: object to register 379 * @handlep: pointer to return the created handle to the caller 380 * 381 * This expects the dev->object_name_lock to be held already and will drop it 382 * before returning. Used to avoid races in establishing new handles when 383 * importing an object from either an flink name or a dma-buf. 384 * 385 * Handles must be release again through drm_gem_handle_delete(). This is done 386 * when userspace closes @file_priv for all attached handles, or through the 387 * GEM_CLOSE ioctl for individual handles. 388 */ 389 int 390 drm_gem_handle_create_tail(struct drm_file *file_priv, 391 struct drm_gem_object *obj, 392 u32 *handlep) 393 { 394 struct drm_device *dev = obj->dev; 395 int ret; 396 397 *handlep = 0; /* whack gcc warning */ 398 WARN_ON(!mutex_is_locked(&dev->object_name_lock)); 399 400 /* 401 * Get the user-visible handle using idr. Preload and perform 402 * allocation under our spinlock. 403 */ 404 idr_preload(GFP_KERNEL); 405 lockmgr(&file_priv->table_lock, LK_EXCLUSIVE); 406 407 ret = idr_alloc(&file_priv->object_idr, obj, 1, 0, GFP_NOWAIT); 408 drm_gem_object_reference(obj); 409 obj->handle_count++; 410 lockmgr(&file_priv->table_lock, LK_RELEASE); 411 idr_preload_end(); 412 mutex_unlock(&dev->object_name_lock); 413 if (ret < 0) { 414 drm_gem_object_handle_unreference_unlocked(obj); 415 return ret; 416 } 417 *handlep = ret; 418 419 #if 0 420 ret = drm_vma_node_allow(&obj->vma_node, file_priv->filp); 421 if (ret) { 422 drm_gem_handle_delete(file_priv, *handlep); 423 return ret; 424 } 425 #endif 426 427 if (dev->driver->gem_open_object) { 428 ret = dev->driver->gem_open_object(obj, file_priv); 429 if (ret) { 430 drm_gem_handle_delete(file_priv, *handlep); 431 return ret; 432 } 433 } 434 435 return 0; 436 } 437 438 /** 439 * drm_gem_handle_create - create a gem handle for an object 440 * @file_priv: drm file-private structure to register the handle for 441 * @obj: object to register 442 * @handlep: pionter to return the created handle to the caller 443 * 444 * Create a handle for this object. This adds a handle reference 445 * to the object, which includes a regular reference count. Callers 446 * will likely want to dereference the object afterwards. 447 */ 448 int drm_gem_handle_create(struct drm_file *file_priv, 449 struct drm_gem_object *obj, 450 u32 *handlep) 451 { 452 mutex_lock(&obj->dev->object_name_lock); 453 454 return drm_gem_handle_create_tail(file_priv, obj, handlep); 455 } 456 EXPORT_SYMBOL(drm_gem_handle_create); 457 458 /** 459 * drm_gem_free_mmap_offset - release a fake mmap offset for an object 460 * @obj: obj in question 461 * 462 * This routine frees fake offsets allocated by drm_gem_create_mmap_offset(). 463 * 464 * Note that drm_gem_object_release() already calls this function, so drivers 465 * don't have to take care of releasing the mmap offset themselves when freeing 466 * the GEM object. 467 */ 468 void 469 drm_gem_free_mmap_offset(struct drm_gem_object *obj) 470 { 471 struct drm_device *dev = obj->dev; 472 struct drm_gem_mm *mm = dev->mm_private; 473 struct drm_hash_item *list; 474 475 if (!obj->on_map) 476 return; 477 list = &obj->map_list; 478 479 drm_ht_remove_item(&mm->offset_hash, list); 480 free_unr(mm->idxunr, list->key); 481 obj->on_map = false; 482 483 drm_vma_offset_remove(&mm->vma_manager, &obj->vma_node); 484 } 485 EXPORT_SYMBOL(drm_gem_free_mmap_offset); 486 487 /** 488 * drm_gem_create_mmap_offset_size - create a fake mmap offset for an object 489 * @obj: obj in question 490 * @size: the virtual size 491 * 492 * GEM memory mapping works by handing back to userspace a fake mmap offset 493 * it can use in a subsequent mmap(2) call. The DRM core code then looks 494 * up the object based on the offset and sets up the various memory mapping 495 * structures. 496 * 497 * This routine allocates and attaches a fake offset for @obj, in cases where 498 * the virtual size differs from the physical size (ie. obj->size). Otherwise 499 * just use drm_gem_create_mmap_offset(). 500 * 501 * This function is idempotent and handles an already allocated mmap offset 502 * transparently. Drivers do not need to check for this case. 503 */ 504 int 505 drm_gem_create_mmap_offset_size(struct drm_gem_object *obj, size_t size) 506 { 507 struct drm_device *dev = obj->dev; 508 struct drm_gem_mm *mm = dev->mm_private; 509 int ret = 0; 510 511 if (obj->on_map) 512 return (0); 513 514 obj->map_list.key = alloc_unr(mm->idxunr); 515 ret = drm_ht_insert_item(&mm->offset_hash, &obj->map_list); 516 if (ret != 0) { 517 DRM_ERROR("failed to add to map hash\n"); 518 free_unr(mm->idxunr, obj->map_list.key); 519 return (ret); 520 } 521 obj->on_map = true; 522 return 0; 523 524 return drm_vma_offset_add(&mm->vma_manager, &obj->vma_node, 525 size / PAGE_SIZE); 526 } 527 EXPORT_SYMBOL(drm_gem_create_mmap_offset_size); 528 529 /** 530 * drm_gem_create_mmap_offset - create a fake mmap offset for an object 531 * @obj: obj in question 532 * 533 * GEM memory mapping works by handing back to userspace a fake mmap offset 534 * it can use in a subsequent mmap(2) call. The DRM core code then looks 535 * up the object based on the offset and sets up the various memory mapping 536 * structures. 537 * 538 * This routine allocates and attaches a fake offset for @obj. 539 * 540 * Drivers can call drm_gem_free_mmap_offset() before freeing @obj to release 541 * the fake offset again. 542 */ 543 int drm_gem_create_mmap_offset(struct drm_gem_object *obj) 544 { 545 return drm_gem_create_mmap_offset_size(obj, obj->size); 546 } 547 EXPORT_SYMBOL(drm_gem_create_mmap_offset); 548 549 /** 550 * drm_gem_object_lookup - look up a GEM object from it's handle 551 * @dev: DRM device 552 * @filp: DRM file private date 553 * @handle: userspace handle 554 * 555 * Returns: 556 * 557 * A reference to the object named by the handle if such exists on @filp, NULL 558 * otherwise. 559 */ 560 struct drm_gem_object * 561 drm_gem_object_lookup(struct drm_file *filp, u32 handle) 562 { 563 struct drm_gem_object *obj; 564 565 lockmgr(&filp->table_lock, LK_EXCLUSIVE); 566 567 /* Check if we currently have a reference on the object */ 568 obj = idr_find(&filp->object_idr, handle); 569 if (obj == NULL) { 570 lockmgr(&filp->table_lock, LK_RELEASE); 571 return NULL; 572 } 573 574 drm_gem_object_reference(obj); 575 576 lockmgr(&filp->table_lock, LK_RELEASE); 577 578 return obj; 579 } 580 EXPORT_SYMBOL(drm_gem_object_lookup); 581 582 /** 583 * drm_gem_close_ioctl - implementation of the GEM_CLOSE ioctl 584 * @dev: drm_device 585 * @data: ioctl data 586 * @file_priv: drm file-private structure 587 * 588 * Releases the handle to an mm object. 589 */ 590 int 591 drm_gem_close_ioctl(struct drm_device *dev, void *data, 592 struct drm_file *file_priv) 593 { 594 struct drm_gem_close *args = data; 595 int ret; 596 597 if (!drm_core_check_feature(dev, DRIVER_GEM)) 598 return -ENODEV; 599 600 ret = drm_gem_handle_delete(file_priv, args->handle); 601 602 return ret; 603 } 604 605 /** 606 * Create a global name for an object, returning the name. 607 * 608 * Note that the name does not hold a reference; when the object 609 * is freed, the name goes away. 610 */ 611 int 612 drm_gem_flink_ioctl(struct drm_device *dev, void *data, 613 struct drm_file *file_priv) 614 { 615 struct drm_gem_flink *args = data; 616 struct drm_gem_object *obj; 617 int ret; 618 619 if (!drm_core_check_feature(dev, DRIVER_GEM)) 620 return -ENODEV; 621 622 obj = drm_gem_object_lookup(file_priv, args->handle); 623 if (obj == NULL) 624 return -ENOENT; 625 626 idr_preload(GFP_KERNEL); 627 lockmgr(&dev->object_name_lock, LK_EXCLUSIVE); 628 /* prevent races with concurrent gem_close. */ 629 if (obj->handle_count == 0) { 630 ret = -ENOENT; 631 goto err; 632 } 633 634 if (!obj->name) { 635 ret = idr_alloc(&dev->object_name_idr, obj, 1, 0, GFP_NOWAIT); 636 if (ret < 0) 637 goto err; 638 639 obj->name = ret; 640 641 /* Allocate a reference for the name table. */ 642 drm_gem_object_reference(obj); 643 } 644 645 args->name = (uint64_t) obj->name; 646 ret = 0; 647 648 err: 649 lockmgr(&dev->object_name_lock, LK_RELEASE); 650 idr_preload_end(); 651 drm_gem_object_unreference_unlocked(obj); 652 return ret; 653 } 654 655 /** 656 * drm_gem_open - implementation of the GEM_OPEN ioctl 657 * @dev: drm_device 658 * @data: ioctl data 659 * @file_priv: drm file-private structure 660 * 661 * Open an object using the global name, returning a handle and the size. 662 * 663 * This handle (of course) holds a reference to the object, so the object 664 * will not go away until the handle is deleted. 665 */ 666 int 667 drm_gem_open_ioctl(struct drm_device *dev, void *data, 668 struct drm_file *file_priv) 669 { 670 struct drm_gem_open *args = data; 671 struct drm_gem_object *obj; 672 int ret; 673 u32 handle; 674 675 if (!drm_core_check_feature(dev, DRIVER_GEM)) 676 return -ENODEV; 677 678 lockmgr(&dev->object_name_lock, LK_EXCLUSIVE); 679 obj = idr_find(&dev->object_name_idr, (int) args->name); 680 if (obj) 681 drm_gem_object_reference(obj); 682 lockmgr(&dev->object_name_lock, LK_RELEASE); 683 if (!obj) 684 return -ENOENT; 685 686 ret = drm_gem_handle_create(file_priv, obj, &handle); 687 drm_gem_object_unreference_unlocked(obj); 688 if (ret) 689 return ret; 690 691 args->handle = handle; 692 args->size = obj->size; 693 694 return 0; 695 } 696 697 /** 698 * gem_gem_open - initalizes GEM file-private structures at devnode open time 699 * @dev: drm_device which is being opened by userspace 700 * @file_private: drm file-private structure to set up 701 * 702 * Called at device open time, sets up the structure for handling refcounting 703 * of mm objects. 704 */ 705 void 706 drm_gem_open(struct drm_device *dev, struct drm_file *file_private) 707 { 708 idr_init(&file_private->object_idr); 709 lockinit(&file_private->table_lock, "fptab", 0, LK_CANRECURSE); 710 } 711 712 /** 713 * drm_gem_release - release file-private GEM resources 714 * @dev: drm_device which is being closed by userspace 715 * @file_private: drm file-private structure to clean up 716 * 717 * Called at close time when the filp is going away. 718 * 719 * Releases any remaining references on objects by this filp. 720 */ 721 void 722 drm_gem_release(struct drm_device *dev, struct drm_file *file_private) 723 { 724 idr_for_each(&file_private->object_idr, 725 &drm_gem_object_release_handle, file_private); 726 idr_destroy(&file_private->object_idr); 727 } 728 729 /** 730 * drm_gem_object_release - release GEM buffer object resources 731 * @obj: GEM buffer object 732 * 733 * This releases any structures and resources used by @obj and is the invers of 734 * drm_gem_object_init(). 735 */ 736 void 737 drm_gem_object_release(struct drm_gem_object *obj) 738 { 739 740 /* 741 * obj->vm_obj can be NULL for private gem objects. 742 */ 743 vm_object_deallocate(obj->filp); 744 } 745 EXPORT_SYMBOL(drm_gem_object_release); 746 747 /** 748 * drm_gem_object_free - free a GEM object 749 * @kref: kref of the object to free 750 * 751 * Called after the last reference to the object has been lost. 752 * Must be called holding struct_ mutex 753 * 754 * Frees the object 755 */ 756 void 757 drm_gem_object_free(struct kref *kref) 758 { 759 struct drm_gem_object *obj = 760 container_of(kref, struct drm_gem_object, refcount); 761 struct drm_device *dev = obj->dev; 762 763 WARN_ON(!mutex_is_locked(&dev->struct_mutex)); 764 765 if (dev->driver->gem_free_object != NULL) 766 dev->driver->gem_free_object(obj); 767 } 768 EXPORT_SYMBOL(drm_gem_object_free); 769 770 static struct drm_gem_object * 771 drm_gem_object_from_offset(struct drm_device *dev, vm_ooffset_t offset) 772 { 773 struct drm_gem_object *obj; 774 struct drm_gem_mm *mm = dev->mm_private; 775 struct drm_hash_item *hash; 776 777 if ((offset & DRM_GEM_MAPPING_MASK) != DRM_GEM_MAPPING_KEY) 778 return (NULL); 779 offset &= ~DRM_GEM_MAPPING_KEY; 780 781 if (drm_ht_find_item(&mm->offset_hash, DRM_GEM_MAPPING_IDX(offset), 782 &hash) != 0) { 783 return (NULL); 784 } 785 obj = container_of(hash, struct drm_gem_object, map_list); 786 return (obj); 787 } 788 789 int 790 drm_gem_mmap_single(struct drm_device *dev, vm_ooffset_t *offset, vm_size_t size, 791 struct vm_object **obj_res, int nprot) 792 { 793 struct drm_gem_object *gem_obj; 794 struct vm_object *vm_obj; 795 796 DRM_LOCK(dev); 797 gem_obj = drm_gem_object_from_offset(dev, *offset); 798 if (gem_obj == NULL) { 799 DRM_UNLOCK(dev); 800 return (ENODEV); 801 } 802 803 drm_gem_object_reference(gem_obj); 804 DRM_UNLOCK(dev); 805 vm_obj = cdev_pager_allocate(gem_obj, OBJT_MGTDEVICE, 806 dev->driver->gem_vm_ops, size, nprot, 807 DRM_GEM_MAPPING_MAPOFF(*offset), curthread->td_ucred); 808 if (vm_obj == NULL) { 809 drm_gem_object_unreference_unlocked(gem_obj); 810 return (EINVAL); 811 } 812 *offset = DRM_GEM_MAPPING_MAPOFF(*offset); 813 *obj_res = vm_obj; 814 return (0); 815 } 816