1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * NVIDIA Tegra DRM GEM helper functions 4 * 5 * Copyright (C) 2012 Sascha Hauer, Pengutronix 6 * Copyright (C) 2013-2015 NVIDIA CORPORATION, All rights reserved. 7 * 8 * Based on the GEM/CMA helpers 9 * 10 * Copyright (c) 2011 Samsung Electronics Co., Ltd. 11 */ 12 13 #include <linux/dma-buf.h> 14 #include <linux/iommu.h> 15 #include <linux/module.h> 16 17 #include <drm/drm_drv.h> 18 #include <drm/drm_prime.h> 19 #include <drm/tegra_drm.h> 20 21 #include "drm.h" 22 #include "gem.h" 23 24 MODULE_IMPORT_NS(DMA_BUF); 25 26 static unsigned int sg_dma_count_chunks(struct scatterlist *sgl, unsigned int nents) 27 { 28 dma_addr_t next = ~(dma_addr_t)0; 29 unsigned int count = 0, i; 30 struct scatterlist *s; 31 32 for_each_sg(sgl, s, nents, i) { 33 /* sg_dma_address(s) is only valid for entries that have sg_dma_len(s) != 0. */ 34 if (!sg_dma_len(s)) 35 continue; 36 37 if (sg_dma_address(s) != next) { 38 next = sg_dma_address(s) + sg_dma_len(s); 39 count++; 40 } 41 } 42 43 return count; 44 } 45 46 static inline unsigned int sgt_dma_count_chunks(struct sg_table *sgt) 47 { 48 return sg_dma_count_chunks(sgt->sgl, sgt->nents); 49 } 50 51 static void tegra_bo_put(struct host1x_bo *bo) 52 { 53 struct tegra_bo *obj = host1x_to_tegra_bo(bo); 54 55 drm_gem_object_put(&obj->gem); 56 } 57 58 static struct host1x_bo_mapping *tegra_bo_pin(struct device *dev, struct host1x_bo *bo, 59 enum dma_data_direction direction) 60 { 61 struct tegra_bo *obj = host1x_to_tegra_bo(bo); 62 struct drm_gem_object *gem = &obj->gem; 63 struct host1x_bo_mapping *map; 64 int err; 65 66 map = kzalloc(sizeof(*map), GFP_KERNEL); 67 if (!map) 68 return ERR_PTR(-ENOMEM); 69 70 kref_init(&map->ref); 71 map->bo = host1x_bo_get(bo); 72 map->direction = direction; 73 map->dev = dev; 74 75 /* 76 * Imported buffers need special treatment to satisfy the semantics of DMA-BUF. 77 */ 78 if (gem->import_attach) { 79 struct dma_buf *buf = gem->import_attach->dmabuf; 80 81 map->attach = dma_buf_attach(buf, dev); 82 if (IS_ERR(map->attach)) { 83 err = PTR_ERR(map->attach); 84 goto free; 85 } 86 87 map->sgt = dma_buf_map_attachment(map->attach, direction); 88 if (IS_ERR(map->sgt)) { 89 dma_buf_detach(buf, map->attach); 90 err = PTR_ERR(map->sgt); 91 map->sgt = NULL; 92 goto free; 93 } 94 95 err = sgt_dma_count_chunks(map->sgt); 96 map->size = gem->size; 97 98 goto out; 99 } 100 101 /* 102 * If we don't have a mapping for this buffer yet, return an SG table 103 * so that host1x can do the mapping for us via the DMA API. 104 */ 105 map->sgt = kzalloc(sizeof(*map->sgt), GFP_KERNEL); 106 if (!map->sgt) { 107 err = -ENOMEM; 108 goto free; 109 } 110 111 if (obj->pages) { 112 /* 113 * If the buffer object was allocated from the explicit IOMMU 114 * API code paths, construct an SG table from the pages. 115 */ 116 err = sg_alloc_table_from_pages(map->sgt, obj->pages, obj->num_pages, 0, gem->size, 117 GFP_KERNEL); 118 if (err < 0) 119 goto free; 120 } else { 121 /* 122 * If the buffer object had no pages allocated and if it was 123 * not imported, it had to be allocated with the DMA API, so 124 * the DMA API helper can be used. 125 */ 126 err = dma_get_sgtable(dev, map->sgt, obj->vaddr, obj->iova, gem->size); 127 if (err < 0) 128 goto free; 129 } 130 131 err = dma_map_sgtable(dev, map->sgt, direction, 0); 132 if (err) 133 goto free_sgt; 134 135 out: 136 /* 137 * If we've manually mapped the buffer object through the IOMMU, make sure to return the 138 * existing IOVA address of our mapping. 139 */ 140 if (!obj->mm) { 141 map->phys = sg_dma_address(map->sgt->sgl); 142 map->chunks = err; 143 } else { 144 map->phys = obj->iova; 145 map->chunks = 1; 146 } 147 148 map->size = gem->size; 149 150 return map; 151 152 free_sgt: 153 sg_free_table(map->sgt); 154 free: 155 kfree(map->sgt); 156 kfree(map); 157 return ERR_PTR(err); 158 } 159 160 static void tegra_bo_unpin(struct host1x_bo_mapping *map) 161 { 162 if (map->attach) { 163 dma_buf_unmap_attachment(map->attach, map->sgt, map->direction); 164 dma_buf_detach(map->attach->dmabuf, map->attach); 165 } else { 166 dma_unmap_sgtable(map->dev, map->sgt, map->direction, 0); 167 sg_free_table(map->sgt); 168 kfree(map->sgt); 169 } 170 171 host1x_bo_put(map->bo); 172 kfree(map); 173 } 174 175 static void *tegra_bo_mmap(struct host1x_bo *bo) 176 { 177 struct tegra_bo *obj = host1x_to_tegra_bo(bo); 178 struct iosys_map map; 179 int ret; 180 181 if (obj->vaddr) { 182 return obj->vaddr; 183 } else if (obj->gem.import_attach) { 184 ret = dma_buf_vmap(obj->gem.import_attach->dmabuf, &map); 185 return ret ? NULL : map.vaddr; 186 } else { 187 return vmap(obj->pages, obj->num_pages, VM_MAP, 188 pgprot_writecombine(PAGE_KERNEL)); 189 } 190 } 191 192 static void tegra_bo_munmap(struct host1x_bo *bo, void *addr) 193 { 194 struct tegra_bo *obj = host1x_to_tegra_bo(bo); 195 struct iosys_map map = IOSYS_MAP_INIT_VADDR(addr); 196 197 if (obj->vaddr) 198 return; 199 else if (obj->gem.import_attach) 200 dma_buf_vunmap(obj->gem.import_attach->dmabuf, &map); 201 else 202 vunmap(addr); 203 } 204 205 static struct host1x_bo *tegra_bo_get(struct host1x_bo *bo) 206 { 207 struct tegra_bo *obj = host1x_to_tegra_bo(bo); 208 209 drm_gem_object_get(&obj->gem); 210 211 return bo; 212 } 213 214 static const struct host1x_bo_ops tegra_bo_ops = { 215 .get = tegra_bo_get, 216 .put = tegra_bo_put, 217 .pin = tegra_bo_pin, 218 .unpin = tegra_bo_unpin, 219 .mmap = tegra_bo_mmap, 220 .munmap = tegra_bo_munmap, 221 }; 222 223 static int tegra_bo_iommu_map(struct tegra_drm *tegra, struct tegra_bo *bo) 224 { 225 int prot = IOMMU_READ | IOMMU_WRITE; 226 int err; 227 228 if (bo->mm) 229 return -EBUSY; 230 231 bo->mm = kzalloc(sizeof(*bo->mm), GFP_KERNEL); 232 if (!bo->mm) 233 return -ENOMEM; 234 235 mutex_lock(&tegra->mm_lock); 236 237 err = drm_mm_insert_node_generic(&tegra->mm, 238 bo->mm, bo->gem.size, PAGE_SIZE, 0, 0); 239 if (err < 0) { 240 dev_err(tegra->drm->dev, "out of I/O virtual memory: %d\n", 241 err); 242 goto unlock; 243 } 244 245 bo->iova = bo->mm->start; 246 247 bo->size = iommu_map_sgtable(tegra->domain, bo->iova, bo->sgt, prot); 248 if (!bo->size) { 249 dev_err(tegra->drm->dev, "failed to map buffer\n"); 250 err = -ENOMEM; 251 goto remove; 252 } 253 254 mutex_unlock(&tegra->mm_lock); 255 256 return 0; 257 258 remove: 259 drm_mm_remove_node(bo->mm); 260 unlock: 261 mutex_unlock(&tegra->mm_lock); 262 kfree(bo->mm); 263 return err; 264 } 265 266 static int tegra_bo_iommu_unmap(struct tegra_drm *tegra, struct tegra_bo *bo) 267 { 268 if (!bo->mm) 269 return 0; 270 271 mutex_lock(&tegra->mm_lock); 272 iommu_unmap(tegra->domain, bo->iova, bo->size); 273 drm_mm_remove_node(bo->mm); 274 mutex_unlock(&tegra->mm_lock); 275 276 kfree(bo->mm); 277 278 return 0; 279 } 280 281 static const struct drm_gem_object_funcs tegra_gem_object_funcs = { 282 .free = tegra_bo_free_object, 283 .export = tegra_gem_prime_export, 284 .vm_ops = &tegra_bo_vm_ops, 285 }; 286 287 static struct tegra_bo *tegra_bo_alloc_object(struct drm_device *drm, 288 size_t size) 289 { 290 struct tegra_bo *bo; 291 int err; 292 293 bo = kzalloc(sizeof(*bo), GFP_KERNEL); 294 if (!bo) 295 return ERR_PTR(-ENOMEM); 296 297 bo->gem.funcs = &tegra_gem_object_funcs; 298 299 host1x_bo_init(&bo->base, &tegra_bo_ops); 300 size = round_up(size, PAGE_SIZE); 301 302 err = drm_gem_object_init(drm, &bo->gem, size); 303 if (err < 0) 304 goto free; 305 306 err = drm_gem_create_mmap_offset(&bo->gem); 307 if (err < 0) 308 goto release; 309 310 return bo; 311 312 release: 313 drm_gem_object_release(&bo->gem); 314 free: 315 kfree(bo); 316 return ERR_PTR(err); 317 } 318 319 static void tegra_bo_free(struct drm_device *drm, struct tegra_bo *bo) 320 { 321 if (bo->pages) { 322 dma_unmap_sgtable(drm->dev, bo->sgt, DMA_FROM_DEVICE, 0); 323 drm_gem_put_pages(&bo->gem, bo->pages, true, true); 324 sg_free_table(bo->sgt); 325 kfree(bo->sgt); 326 } else if (bo->vaddr) { 327 dma_free_wc(drm->dev, bo->gem.size, bo->vaddr, bo->iova); 328 } 329 } 330 331 static int tegra_bo_get_pages(struct drm_device *drm, struct tegra_bo *bo) 332 { 333 int err; 334 335 bo->pages = drm_gem_get_pages(&bo->gem); 336 if (IS_ERR(bo->pages)) 337 return PTR_ERR(bo->pages); 338 339 bo->num_pages = bo->gem.size >> PAGE_SHIFT; 340 341 bo->sgt = drm_prime_pages_to_sg(bo->gem.dev, bo->pages, bo->num_pages); 342 if (IS_ERR(bo->sgt)) { 343 err = PTR_ERR(bo->sgt); 344 goto put_pages; 345 } 346 347 err = dma_map_sgtable(drm->dev, bo->sgt, DMA_FROM_DEVICE, 0); 348 if (err) 349 goto free_sgt; 350 351 return 0; 352 353 free_sgt: 354 sg_free_table(bo->sgt); 355 kfree(bo->sgt); 356 put_pages: 357 drm_gem_put_pages(&bo->gem, bo->pages, false, false); 358 return err; 359 } 360 361 static int tegra_bo_alloc(struct drm_device *drm, struct tegra_bo *bo) 362 { 363 struct tegra_drm *tegra = drm->dev_private; 364 int err; 365 366 if (tegra->domain) { 367 err = tegra_bo_get_pages(drm, bo); 368 if (err < 0) 369 return err; 370 371 err = tegra_bo_iommu_map(tegra, bo); 372 if (err < 0) { 373 tegra_bo_free(drm, bo); 374 return err; 375 } 376 } else { 377 size_t size = bo->gem.size; 378 379 bo->vaddr = dma_alloc_wc(drm->dev, size, &bo->iova, 380 GFP_KERNEL | __GFP_NOWARN); 381 if (!bo->vaddr) { 382 dev_err(drm->dev, 383 "failed to allocate buffer of size %zu\n", 384 size); 385 return -ENOMEM; 386 } 387 } 388 389 return 0; 390 } 391 392 struct tegra_bo *tegra_bo_create(struct drm_device *drm, size_t size, 393 unsigned long flags) 394 { 395 struct tegra_bo *bo; 396 int err; 397 398 bo = tegra_bo_alloc_object(drm, size); 399 if (IS_ERR(bo)) 400 return bo; 401 402 err = tegra_bo_alloc(drm, bo); 403 if (err < 0) 404 goto release; 405 406 if (flags & DRM_TEGRA_GEM_CREATE_TILED) 407 bo->tiling.mode = TEGRA_BO_TILING_MODE_TILED; 408 409 if (flags & DRM_TEGRA_GEM_CREATE_BOTTOM_UP) 410 bo->flags |= TEGRA_BO_BOTTOM_UP; 411 412 return bo; 413 414 release: 415 drm_gem_object_release(&bo->gem); 416 kfree(bo); 417 return ERR_PTR(err); 418 } 419 420 struct tegra_bo *tegra_bo_create_with_handle(struct drm_file *file, 421 struct drm_device *drm, 422 size_t size, 423 unsigned long flags, 424 u32 *handle) 425 { 426 struct tegra_bo *bo; 427 int err; 428 429 bo = tegra_bo_create(drm, size, flags); 430 if (IS_ERR(bo)) 431 return bo; 432 433 err = drm_gem_handle_create(file, &bo->gem, handle); 434 if (err) { 435 tegra_bo_free_object(&bo->gem); 436 return ERR_PTR(err); 437 } 438 439 drm_gem_object_put(&bo->gem); 440 441 return bo; 442 } 443 444 static struct tegra_bo *tegra_bo_import(struct drm_device *drm, 445 struct dma_buf *buf) 446 { 447 struct tegra_drm *tegra = drm->dev_private; 448 struct dma_buf_attachment *attach; 449 struct tegra_bo *bo; 450 int err; 451 452 bo = tegra_bo_alloc_object(drm, buf->size); 453 if (IS_ERR(bo)) 454 return bo; 455 456 attach = dma_buf_attach(buf, drm->dev); 457 if (IS_ERR(attach)) { 458 err = PTR_ERR(attach); 459 goto free; 460 } 461 462 get_dma_buf(buf); 463 464 bo->sgt = dma_buf_map_attachment(attach, DMA_TO_DEVICE); 465 if (IS_ERR(bo->sgt)) { 466 err = PTR_ERR(bo->sgt); 467 goto detach; 468 } 469 470 if (tegra->domain) { 471 err = tegra_bo_iommu_map(tegra, bo); 472 if (err < 0) 473 goto detach; 474 } 475 476 bo->gem.import_attach = attach; 477 478 return bo; 479 480 detach: 481 if (!IS_ERR_OR_NULL(bo->sgt)) 482 dma_buf_unmap_attachment(attach, bo->sgt, DMA_TO_DEVICE); 483 484 dma_buf_detach(buf, attach); 485 dma_buf_put(buf); 486 free: 487 drm_gem_object_release(&bo->gem); 488 kfree(bo); 489 return ERR_PTR(err); 490 } 491 492 void tegra_bo_free_object(struct drm_gem_object *gem) 493 { 494 struct tegra_drm *tegra = gem->dev->dev_private; 495 struct host1x_bo_mapping *mapping, *tmp; 496 struct tegra_bo *bo = to_tegra_bo(gem); 497 498 /* remove all mappings of this buffer object from any caches */ 499 list_for_each_entry_safe(mapping, tmp, &bo->base.mappings, list) { 500 if (mapping->cache) 501 host1x_bo_unpin(mapping); 502 else 503 dev_err(gem->dev->dev, "mapping %p stale for device %s\n", mapping, 504 dev_name(mapping->dev)); 505 } 506 507 if (tegra->domain) 508 tegra_bo_iommu_unmap(tegra, bo); 509 510 if (gem->import_attach) { 511 dma_buf_unmap_attachment(gem->import_attach, bo->sgt, 512 DMA_TO_DEVICE); 513 drm_prime_gem_destroy(gem, NULL); 514 } else { 515 tegra_bo_free(gem->dev, bo); 516 } 517 518 drm_gem_object_release(gem); 519 kfree(bo); 520 } 521 522 int tegra_bo_dumb_create(struct drm_file *file, struct drm_device *drm, 523 struct drm_mode_create_dumb *args) 524 { 525 unsigned int min_pitch = DIV_ROUND_UP(args->width * args->bpp, 8); 526 struct tegra_drm *tegra = drm->dev_private; 527 struct tegra_bo *bo; 528 529 args->pitch = round_up(min_pitch, tegra->pitch_align); 530 args->size = args->pitch * args->height; 531 532 bo = tegra_bo_create_with_handle(file, drm, args->size, 0, 533 &args->handle); 534 if (IS_ERR(bo)) 535 return PTR_ERR(bo); 536 537 return 0; 538 } 539 540 static vm_fault_t tegra_bo_fault(struct vm_fault *vmf) 541 { 542 struct vm_area_struct *vma = vmf->vma; 543 struct drm_gem_object *gem = vma->vm_private_data; 544 struct tegra_bo *bo = to_tegra_bo(gem); 545 struct page *page; 546 pgoff_t offset; 547 548 if (!bo->pages) 549 return VM_FAULT_SIGBUS; 550 551 offset = (vmf->address - vma->vm_start) >> PAGE_SHIFT; 552 page = bo->pages[offset]; 553 554 return vmf_insert_page(vma, vmf->address, page); 555 } 556 557 const struct vm_operations_struct tegra_bo_vm_ops = { 558 .fault = tegra_bo_fault, 559 .open = drm_gem_vm_open, 560 .close = drm_gem_vm_close, 561 }; 562 563 int __tegra_gem_mmap(struct drm_gem_object *gem, struct vm_area_struct *vma) 564 { 565 struct tegra_bo *bo = to_tegra_bo(gem); 566 567 if (!bo->pages) { 568 unsigned long vm_pgoff = vma->vm_pgoff; 569 int err; 570 571 /* 572 * Clear the VM_PFNMAP flag that was set by drm_gem_mmap(), 573 * and set the vm_pgoff (used as a fake buffer offset by DRM) 574 * to 0 as we want to map the whole buffer. 575 */ 576 vma->vm_flags &= ~VM_PFNMAP; 577 vma->vm_pgoff = 0; 578 579 err = dma_mmap_wc(gem->dev->dev, vma, bo->vaddr, bo->iova, 580 gem->size); 581 if (err < 0) { 582 drm_gem_vm_close(vma); 583 return err; 584 } 585 586 vma->vm_pgoff = vm_pgoff; 587 } else { 588 pgprot_t prot = vm_get_page_prot(vma->vm_flags); 589 590 vma->vm_flags |= VM_MIXEDMAP; 591 vma->vm_flags &= ~VM_PFNMAP; 592 593 vma->vm_page_prot = pgprot_writecombine(prot); 594 } 595 596 return 0; 597 } 598 599 int tegra_drm_mmap(struct file *file, struct vm_area_struct *vma) 600 { 601 struct drm_gem_object *gem; 602 int err; 603 604 err = drm_gem_mmap(file, vma); 605 if (err < 0) 606 return err; 607 608 gem = vma->vm_private_data; 609 610 return __tegra_gem_mmap(gem, vma); 611 } 612 613 static struct sg_table * 614 tegra_gem_prime_map_dma_buf(struct dma_buf_attachment *attach, 615 enum dma_data_direction dir) 616 { 617 struct drm_gem_object *gem = attach->dmabuf->priv; 618 struct tegra_bo *bo = to_tegra_bo(gem); 619 struct sg_table *sgt; 620 621 sgt = kmalloc(sizeof(*sgt), GFP_KERNEL); 622 if (!sgt) 623 return NULL; 624 625 if (bo->pages) { 626 if (sg_alloc_table_from_pages(sgt, bo->pages, bo->num_pages, 627 0, gem->size, GFP_KERNEL) < 0) 628 goto free; 629 } else { 630 if (dma_get_sgtable(attach->dev, sgt, bo->vaddr, bo->iova, 631 gem->size) < 0) 632 goto free; 633 } 634 635 if (dma_map_sgtable(attach->dev, sgt, dir, 0)) 636 goto free; 637 638 return sgt; 639 640 free: 641 sg_free_table(sgt); 642 kfree(sgt); 643 return NULL; 644 } 645 646 static void tegra_gem_prime_unmap_dma_buf(struct dma_buf_attachment *attach, 647 struct sg_table *sgt, 648 enum dma_data_direction dir) 649 { 650 struct drm_gem_object *gem = attach->dmabuf->priv; 651 struct tegra_bo *bo = to_tegra_bo(gem); 652 653 if (bo->pages) 654 dma_unmap_sgtable(attach->dev, sgt, dir, 0); 655 656 sg_free_table(sgt); 657 kfree(sgt); 658 } 659 660 static void tegra_gem_prime_release(struct dma_buf *buf) 661 { 662 drm_gem_dmabuf_release(buf); 663 } 664 665 static int tegra_gem_prime_begin_cpu_access(struct dma_buf *buf, 666 enum dma_data_direction direction) 667 { 668 struct drm_gem_object *gem = buf->priv; 669 struct tegra_bo *bo = to_tegra_bo(gem); 670 struct drm_device *drm = gem->dev; 671 672 if (bo->pages) 673 dma_sync_sgtable_for_cpu(drm->dev, bo->sgt, DMA_FROM_DEVICE); 674 675 return 0; 676 } 677 678 static int tegra_gem_prime_end_cpu_access(struct dma_buf *buf, 679 enum dma_data_direction direction) 680 { 681 struct drm_gem_object *gem = buf->priv; 682 struct tegra_bo *bo = to_tegra_bo(gem); 683 struct drm_device *drm = gem->dev; 684 685 if (bo->pages) 686 dma_sync_sgtable_for_device(drm->dev, bo->sgt, DMA_TO_DEVICE); 687 688 return 0; 689 } 690 691 static int tegra_gem_prime_mmap(struct dma_buf *buf, struct vm_area_struct *vma) 692 { 693 struct drm_gem_object *gem = buf->priv; 694 int err; 695 696 err = drm_gem_mmap_obj(gem, gem->size, vma); 697 if (err < 0) 698 return err; 699 700 return __tegra_gem_mmap(gem, vma); 701 } 702 703 static int tegra_gem_prime_vmap(struct dma_buf *buf, struct iosys_map *map) 704 { 705 struct drm_gem_object *gem = buf->priv; 706 struct tegra_bo *bo = to_tegra_bo(gem); 707 708 iosys_map_set_vaddr(map, bo->vaddr); 709 710 return 0; 711 } 712 713 static void tegra_gem_prime_vunmap(struct dma_buf *buf, struct iosys_map *map) 714 { 715 } 716 717 static const struct dma_buf_ops tegra_gem_prime_dmabuf_ops = { 718 .map_dma_buf = tegra_gem_prime_map_dma_buf, 719 .unmap_dma_buf = tegra_gem_prime_unmap_dma_buf, 720 .release = tegra_gem_prime_release, 721 .begin_cpu_access = tegra_gem_prime_begin_cpu_access, 722 .end_cpu_access = tegra_gem_prime_end_cpu_access, 723 .mmap = tegra_gem_prime_mmap, 724 .vmap = tegra_gem_prime_vmap, 725 .vunmap = tegra_gem_prime_vunmap, 726 }; 727 728 struct dma_buf *tegra_gem_prime_export(struct drm_gem_object *gem, 729 int flags) 730 { 731 DEFINE_DMA_BUF_EXPORT_INFO(exp_info); 732 733 exp_info.exp_name = KBUILD_MODNAME; 734 exp_info.owner = gem->dev->driver->fops->owner; 735 exp_info.ops = &tegra_gem_prime_dmabuf_ops; 736 exp_info.size = gem->size; 737 exp_info.flags = flags; 738 exp_info.priv = gem; 739 740 return drm_gem_dmabuf_export(gem->dev, &exp_info); 741 } 742 743 struct drm_gem_object *tegra_gem_prime_import(struct drm_device *drm, 744 struct dma_buf *buf) 745 { 746 struct tegra_bo *bo; 747 748 if (buf->ops == &tegra_gem_prime_dmabuf_ops) { 749 struct drm_gem_object *gem = buf->priv; 750 751 if (gem->dev == drm) { 752 drm_gem_object_get(gem); 753 return gem; 754 } 755 } 756 757 bo = tegra_bo_import(drm, buf); 758 if (IS_ERR(bo)) 759 return ERR_CAST(bo); 760 761 return &bo->gem; 762 } 763 764 struct host1x_bo *tegra_gem_lookup(struct drm_file *file, u32 handle) 765 { 766 struct drm_gem_object *gem; 767 struct tegra_bo *bo; 768 769 gem = drm_gem_object_lookup(file, handle); 770 if (!gem) 771 return NULL; 772 773 bo = to_tegra_bo(gem); 774 return &bo->base; 775 } 776