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 #include <linux/vmalloc.h> 17 18 #include <drm/drm_drv.h> 19 #include <drm/drm_dumb_buffers.h> 20 #include <drm/drm_prime.h> 21 22 #include "drm.h" 23 #include "gem.h" 24 25 MODULE_IMPORT_NS("DMA_BUF"); 26 27 static unsigned int sg_dma_count_chunks(struct scatterlist *sgl, unsigned int nents) 28 { 29 dma_addr_t next = ~(dma_addr_t)0; 30 unsigned int count = 0, i; 31 struct scatterlist *s; 32 33 for_each_sg(sgl, s, nents, i) { 34 /* sg_dma_address(s) is only valid for entries that have sg_dma_len(s) != 0. */ 35 if (!sg_dma_len(s)) 36 continue; 37 38 if (sg_dma_address(s) != next) { 39 next = sg_dma_address(s) + sg_dma_len(s); 40 count++; 41 } 42 } 43 44 return count; 45 } 46 47 static inline unsigned int sgt_dma_count_chunks(struct sg_table *sgt) 48 { 49 return sg_dma_count_chunks(sgt->sgl, sgt->nents); 50 } 51 52 static void tegra_bo_put(struct host1x_bo *bo) 53 { 54 struct tegra_bo *obj = host1x_to_tegra_bo(bo); 55 56 drm_gem_object_put(&obj->gem); 57 } 58 59 static struct host1x_bo_mapping *tegra_bo_pin(struct device *dev, struct host1x_bo *bo, 60 enum dma_data_direction direction) 61 { 62 struct tegra_bo *obj = host1x_to_tegra_bo(bo); 63 struct drm_gem_object *gem = &obj->gem; 64 struct host1x_bo_mapping *map; 65 int err; 66 67 map = kzalloc_obj(*map); 68 if (!map) 69 return ERR_PTR(-ENOMEM); 70 71 kref_init(&map->ref); 72 map->bo = bo; 73 map->direction = direction; 74 map->dev = dev; 75 76 /* 77 * Imported buffers need special treatment to satisfy the semantics of DMA-BUF. 78 */ 79 if (obj->dma_buf) { 80 struct dma_buf *buf = obj->dma_buf; 81 82 map->attach = dma_buf_attach(buf, dev); 83 if (IS_ERR(map->attach)) { 84 err = PTR_ERR(map->attach); 85 goto free; 86 } 87 88 map->sgt = dma_buf_map_attachment_unlocked(map->attach, direction); 89 if (IS_ERR(map->sgt)) { 90 dma_buf_detach(buf, map->attach); 91 err = PTR_ERR(map->sgt); 92 map->sgt = NULL; 93 goto free; 94 } 95 96 err = sgt_dma_count_chunks(map->sgt); 97 map->size = gem->size; 98 99 goto out; 100 } 101 102 /* 103 * If we don't have a mapping for this buffer yet, return an SG table 104 * so that host1x can do the mapping for us via the DMA API. 105 */ 106 map->sgt = kzalloc_obj(*map->sgt); 107 if (!map->sgt) { 108 err = -ENOMEM; 109 goto free; 110 } 111 112 if (obj->pages) { 113 /* 114 * If the buffer object was allocated from the explicit IOMMU 115 * API code paths, construct an SG table from the pages. 116 */ 117 err = sg_alloc_table_from_pages(map->sgt, obj->pages, obj->num_pages, 0, gem->size, 118 GFP_KERNEL); 119 if (err < 0) 120 goto free; 121 } else { 122 /* 123 * If the buffer object had no pages allocated and if it was 124 * not imported, it had to be allocated with the DMA API, so 125 * the DMA API helper can be used. 126 */ 127 err = dma_get_sgtable(dev, map->sgt, obj->vaddr, obj->iova, gem->size); 128 if (err < 0) 129 goto free; 130 } 131 132 err = dma_map_sgtable(dev, map->sgt, direction, 0); 133 if (err) 134 goto free_sgt; 135 136 out: 137 /* 138 * If we've manually mapped the buffer object through the IOMMU, make sure to return the 139 * existing IOVA address of our mapping. 140 */ 141 if (!obj->mm) { 142 map->phys = sg_dma_address(map->sgt->sgl); 143 map->chunks = err; 144 } else { 145 map->phys = obj->iova; 146 map->chunks = 1; 147 } 148 149 map->size = gem->size; 150 151 return map; 152 153 free_sgt: 154 sg_free_table(map->sgt); 155 free: 156 kfree(map->sgt); 157 kfree(map); 158 return ERR_PTR(err); 159 } 160 161 static void tegra_bo_unpin(struct host1x_bo_mapping *map) 162 { 163 if (map->attach) { 164 dma_buf_unmap_attachment_unlocked(map->attach, map->sgt, 165 map->direction); 166 dma_buf_detach(map->attach->dmabuf, map->attach); 167 } else { 168 dma_unmap_sgtable(map->dev, map->sgt, map->direction, 0); 169 sg_free_table(map->sgt); 170 kfree(map->sgt); 171 } 172 173 kfree(map); 174 } 175 176 static void *tegra_bo_mmap(struct host1x_bo *bo) 177 { 178 struct tegra_bo *obj = host1x_to_tegra_bo(bo); 179 struct iosys_map map = { 0 }; 180 void *vaddr; 181 int ret; 182 183 if (obj->vaddr) 184 return obj->vaddr; 185 186 if (obj->dma_buf) { 187 ret = dma_buf_vmap_unlocked(obj->dma_buf, &map); 188 if (ret < 0) 189 return ERR_PTR(ret); 190 191 return map.vaddr; 192 } 193 194 vaddr = vmap(obj->pages, obj->num_pages, VM_MAP, 195 pgprot_writecombine(PAGE_KERNEL)); 196 if (!vaddr) 197 return ERR_PTR(-ENOMEM); 198 199 return vaddr; 200 } 201 202 static void tegra_bo_munmap(struct host1x_bo *bo, void *addr) 203 { 204 struct tegra_bo *obj = host1x_to_tegra_bo(bo); 205 struct iosys_map map = IOSYS_MAP_INIT_VADDR(addr); 206 207 if (obj->vaddr) 208 return; 209 210 if (obj->dma_buf) 211 return dma_buf_vunmap_unlocked(obj->dma_buf, &map); 212 213 vunmap(addr); 214 } 215 216 static struct host1x_bo *tegra_bo_get(struct host1x_bo *bo) 217 { 218 struct tegra_bo *obj = host1x_to_tegra_bo(bo); 219 220 drm_gem_object_get(&obj->gem); 221 222 return bo; 223 } 224 225 static const struct host1x_bo_ops tegra_bo_ops = { 226 .get = tegra_bo_get, 227 .put = tegra_bo_put, 228 .pin = tegra_bo_pin, 229 .unpin = tegra_bo_unpin, 230 .mmap = tegra_bo_mmap, 231 .munmap = tegra_bo_munmap, 232 }; 233 234 static int tegra_bo_iommu_map(struct tegra_drm *tegra, struct tegra_bo *bo) 235 { 236 int prot = IOMMU_READ | IOMMU_WRITE; 237 ssize_t size; 238 int err; 239 240 if (bo->mm) 241 return -EBUSY; 242 243 bo->mm = kzalloc_obj(*bo->mm); 244 if (!bo->mm) 245 return -ENOMEM; 246 247 mutex_lock(&tegra->mm_lock); 248 249 err = drm_mm_insert_node_generic(&tegra->mm, 250 bo->mm, bo->gem.size, PAGE_SIZE, 0, 0); 251 if (err < 0) { 252 dev_err(tegra->drm->dev, "out of I/O virtual memory: %d\n", 253 err); 254 goto unlock; 255 } 256 257 bo->iova = bo->mm->start; 258 259 size = iommu_map_sgtable(tegra->domain, bo->iova, bo->sgt, prot); 260 if (size < 0) { 261 dev_err(tegra->drm->dev, "failed to map buffer\n"); 262 err = size; 263 goto remove; 264 } 265 266 bo->size = size; 267 268 mutex_unlock(&tegra->mm_lock); 269 270 return 0; 271 272 remove: 273 drm_mm_remove_node(bo->mm); 274 unlock: 275 mutex_unlock(&tegra->mm_lock); 276 kfree(bo->mm); 277 return err; 278 } 279 280 static int tegra_bo_iommu_unmap(struct tegra_drm *tegra, struct tegra_bo *bo) 281 { 282 if (!bo->mm) 283 return 0; 284 285 mutex_lock(&tegra->mm_lock); 286 iommu_unmap(tegra->domain, bo->iova, bo->size); 287 drm_mm_remove_node(bo->mm); 288 mutex_unlock(&tegra->mm_lock); 289 290 kfree(bo->mm); 291 292 return 0; 293 } 294 295 static const struct drm_gem_object_funcs tegra_gem_object_funcs = { 296 .free = tegra_bo_free_object, 297 .export = tegra_gem_prime_export, 298 .vm_ops = &tegra_bo_vm_ops, 299 }; 300 301 static struct tegra_bo *tegra_bo_alloc_object(struct drm_device *drm, 302 size_t size) 303 { 304 struct tegra_bo *bo; 305 int err; 306 307 bo = kzalloc_obj(*bo); 308 if (!bo) 309 return ERR_PTR(-ENOMEM); 310 311 bo->gem.funcs = &tegra_gem_object_funcs; 312 313 host1x_bo_init(&bo->base, &tegra_bo_ops); 314 size = round_up(size, PAGE_SIZE); 315 316 err = drm_gem_object_init(drm, &bo->gem, size); 317 if (err < 0) 318 goto free; 319 320 err = drm_gem_create_mmap_offset(&bo->gem); 321 if (err < 0) 322 goto release; 323 324 return bo; 325 326 release: 327 drm_gem_object_release(&bo->gem); 328 free: 329 kfree(bo); 330 return ERR_PTR(err); 331 } 332 333 static void tegra_bo_free(struct drm_device *drm, struct tegra_bo *bo) 334 { 335 if (bo->pages) { 336 dma_unmap_sgtable(drm->dev, bo->sgt, DMA_FROM_DEVICE, 0); 337 drm_gem_put_pages(&bo->gem, bo->pages, true, true); 338 sg_free_table(bo->sgt); 339 kfree(bo->sgt); 340 } else if (bo->vaddr) { 341 dma_free_wc(drm->dev, bo->gem.size, bo->vaddr, bo->iova); 342 } 343 } 344 345 static int tegra_bo_get_pages(struct drm_device *drm, struct tegra_bo *bo) 346 { 347 int err; 348 349 bo->pages = drm_gem_get_pages(&bo->gem); 350 if (IS_ERR(bo->pages)) 351 return PTR_ERR(bo->pages); 352 353 bo->num_pages = bo->gem.size >> PAGE_SHIFT; 354 355 bo->sgt = drm_prime_pages_to_sg(bo->gem.dev, bo->pages, bo->num_pages); 356 if (IS_ERR(bo->sgt)) { 357 err = PTR_ERR(bo->sgt); 358 goto put_pages; 359 } 360 361 err = dma_map_sgtable(drm->dev, bo->sgt, DMA_FROM_DEVICE, 0); 362 if (err) 363 goto free_sgt; 364 365 return 0; 366 367 free_sgt: 368 sg_free_table(bo->sgt); 369 kfree(bo->sgt); 370 put_pages: 371 drm_gem_put_pages(&bo->gem, bo->pages, false, false); 372 return err; 373 } 374 375 static int tegra_bo_alloc(struct drm_device *drm, struct tegra_bo *bo) 376 { 377 struct tegra_drm *tegra = drm->dev_private; 378 int err; 379 380 if (tegra->domain) { 381 err = tegra_bo_get_pages(drm, bo); 382 if (err < 0) 383 return err; 384 385 err = tegra_bo_iommu_map(tegra, bo); 386 if (err < 0) { 387 tegra_bo_free(drm, bo); 388 return err; 389 } 390 } else { 391 size_t size = bo->gem.size; 392 393 bo->vaddr = dma_alloc_wc(drm->dev, size, &bo->iova, 394 GFP_KERNEL | __GFP_NOWARN); 395 if (!bo->vaddr) { 396 dev_err(drm->dev, 397 "failed to allocate buffer of size %zu\n", 398 size); 399 return -ENOMEM; 400 } 401 } 402 403 return 0; 404 } 405 406 struct tegra_bo *tegra_bo_create(struct drm_device *drm, size_t size, 407 unsigned long flags) 408 { 409 struct tegra_bo *bo; 410 int err; 411 412 bo = tegra_bo_alloc_object(drm, size); 413 if (IS_ERR(bo)) 414 return bo; 415 416 err = tegra_bo_alloc(drm, bo); 417 if (err < 0) 418 goto release; 419 420 if (flags & DRM_TEGRA_GEM_CREATE_TILED) 421 bo->tiling.mode = TEGRA_BO_TILING_MODE_TILED; 422 423 if (flags & DRM_TEGRA_GEM_CREATE_BOTTOM_UP) 424 bo->flags |= TEGRA_BO_BOTTOM_UP; 425 426 return bo; 427 428 release: 429 drm_gem_object_release(&bo->gem); 430 kfree(bo); 431 return ERR_PTR(err); 432 } 433 434 struct tegra_bo *tegra_bo_create_with_handle(struct drm_file *file, 435 struct drm_device *drm, 436 size_t size, 437 unsigned long flags, 438 u32 *handle) 439 { 440 struct tegra_bo *bo; 441 int err; 442 443 bo = tegra_bo_create(drm, size, flags); 444 if (IS_ERR(bo)) 445 return bo; 446 447 err = drm_gem_handle_create(file, &bo->gem, handle); 448 if (err) { 449 tegra_bo_free_object(&bo->gem); 450 return ERR_PTR(err); 451 } 452 453 drm_gem_object_put(&bo->gem); 454 455 return bo; 456 } 457 458 static struct tegra_bo *tegra_bo_import(struct drm_device *drm, 459 struct dma_buf *buf) 460 { 461 struct tegra_drm *tegra = drm->dev_private; 462 struct dma_buf_attachment *attach; 463 struct tegra_bo *bo; 464 int err; 465 466 bo = tegra_bo_alloc_object(drm, buf->size); 467 if (IS_ERR(bo)) 468 return bo; 469 470 /* 471 * If we need to use IOMMU API to map the dma-buf into the internally managed 472 * domain, map it first to the DRM device to get an sgt. 473 */ 474 if (tegra->domain) { 475 attach = dma_buf_attach(buf, drm->dev); 476 if (IS_ERR(attach)) { 477 err = PTR_ERR(attach); 478 goto free; 479 } 480 481 bo->sgt = dma_buf_map_attachment_unlocked(attach, DMA_TO_DEVICE); 482 if (IS_ERR(bo->sgt)) { 483 err = PTR_ERR(bo->sgt); 484 goto detach; 485 } 486 487 err = tegra_bo_iommu_map(tegra, bo); 488 if (err < 0) 489 goto detach; 490 491 bo->gem.import_attach = attach; 492 } 493 494 get_dma_buf(buf); 495 bo->dma_buf = buf; 496 497 return bo; 498 499 detach: 500 if (!IS_ERR_OR_NULL(bo->sgt)) 501 dma_buf_unmap_attachment_unlocked(attach, bo->sgt, DMA_TO_DEVICE); 502 503 dma_buf_detach(buf, attach); 504 dma_buf_put(buf); 505 free: 506 drm_gem_object_release(&bo->gem); 507 kfree(bo); 508 return ERR_PTR(err); 509 } 510 511 void tegra_bo_free_object(struct drm_gem_object *gem) 512 { 513 struct tegra_drm *tegra = gem->dev->dev_private; 514 struct tegra_bo *bo = to_tegra_bo(gem); 515 516 host1x_bo_clear_cached_mappings(&bo->base); 517 518 if (tegra->domain) { 519 tegra_bo_iommu_unmap(tegra, bo); 520 521 if (drm_gem_is_imported(gem)) { 522 dma_buf_unmap_attachment_unlocked(gem->import_attach, bo->sgt, 523 DMA_TO_DEVICE); 524 dma_buf_detach(gem->import_attach->dmabuf, gem->import_attach); 525 } 526 } 527 528 tegra_bo_free(gem->dev, bo); 529 530 if (bo->dma_buf) 531 dma_buf_put(bo->dma_buf); 532 533 drm_gem_object_release(gem); 534 kfree(bo); 535 } 536 537 int tegra_bo_dumb_create(struct drm_file *file, struct drm_device *drm, 538 struct drm_mode_create_dumb *args) 539 { 540 struct tegra_drm *tegra = drm->dev_private; 541 struct tegra_bo *bo; 542 int ret; 543 544 ret = drm_mode_size_dumb(drm, args, tegra->pitch_align, 0); 545 if (ret) 546 return ret; 547 548 bo = tegra_bo_create_with_handle(file, drm, args->size, 0, 549 &args->handle); 550 if (IS_ERR(bo)) 551 return PTR_ERR(bo); 552 553 return 0; 554 } 555 556 static vm_fault_t tegra_bo_fault(struct vm_fault *vmf) 557 { 558 struct vm_area_struct *vma = vmf->vma; 559 struct drm_gem_object *gem = vma->vm_private_data; 560 struct tegra_bo *bo = to_tegra_bo(gem); 561 struct page *page; 562 pgoff_t offset; 563 564 if (!bo->pages) 565 return VM_FAULT_SIGBUS; 566 567 offset = (vmf->address - vma->vm_start) >> PAGE_SHIFT; 568 page = bo->pages[offset]; 569 570 return vmf_insert_page(vma, vmf->address, page); 571 } 572 573 const struct vm_operations_struct tegra_bo_vm_ops = { 574 .fault = tegra_bo_fault, 575 .open = drm_gem_vm_open, 576 .close = drm_gem_vm_close, 577 }; 578 579 int __tegra_gem_mmap(struct drm_gem_object *gem, struct vm_area_struct *vma) 580 { 581 struct tegra_bo *bo = to_tegra_bo(gem); 582 583 if (!bo->pages) { 584 unsigned long vm_pgoff = vma->vm_pgoff; 585 int err; 586 587 /* 588 * Clear the VM_PFNMAP flag that was set by drm_gem_mmap(), 589 * and set the vm_pgoff (used as a fake buffer offset by DRM) 590 * to 0 as we want to map the whole buffer. 591 */ 592 vm_flags_clear(vma, VM_PFNMAP); 593 vma->vm_pgoff = 0; 594 595 err = dma_mmap_wc(gem->dev->dev, vma, bo->vaddr, bo->iova, 596 gem->size); 597 if (err < 0) { 598 drm_gem_vm_close(vma); 599 return err; 600 } 601 602 vma->vm_pgoff = vm_pgoff; 603 } else { 604 pgprot_t prot = vm_get_page_prot(vma->vm_flags); 605 606 vm_flags_mod(vma, VM_MIXEDMAP, VM_PFNMAP); 607 608 vma->vm_page_prot = pgprot_writecombine(prot); 609 } 610 611 return 0; 612 } 613 614 int tegra_drm_mmap(struct file *file, struct vm_area_struct *vma) 615 { 616 struct drm_gem_object *gem; 617 int err; 618 619 err = drm_gem_mmap(file, vma); 620 if (err < 0) 621 return err; 622 623 gem = vma->vm_private_data; 624 625 return __tegra_gem_mmap(gem, vma); 626 } 627 628 static struct sg_table * 629 tegra_gem_prime_map_dma_buf(struct dma_buf_attachment *attach, 630 enum dma_data_direction dir) 631 { 632 struct drm_gem_object *gem = attach->dmabuf->priv; 633 struct tegra_bo *bo = to_tegra_bo(gem); 634 struct sg_table *sgt; 635 636 sgt = kmalloc_obj(*sgt); 637 if (!sgt) 638 return NULL; 639 640 if (bo->pages) { 641 if (sg_alloc_table_from_pages(sgt, bo->pages, bo->num_pages, 642 0, gem->size, GFP_KERNEL) < 0) 643 goto free; 644 } else { 645 if (dma_get_sgtable(attach->dev, sgt, bo->vaddr, bo->iova, 646 gem->size) < 0) 647 goto free; 648 } 649 650 if (dma_map_sgtable(attach->dev, sgt, dir, 0)) 651 goto free; 652 653 return sgt; 654 655 free: 656 sg_free_table(sgt); 657 kfree(sgt); 658 return NULL; 659 } 660 661 static void tegra_gem_prime_unmap_dma_buf(struct dma_buf_attachment *attach, 662 struct sg_table *sgt, 663 enum dma_data_direction dir) 664 { 665 struct drm_gem_object *gem = attach->dmabuf->priv; 666 struct tegra_bo *bo = to_tegra_bo(gem); 667 668 if (bo->pages) 669 dma_unmap_sgtable(attach->dev, sgt, dir, 0); 670 671 sg_free_table(sgt); 672 kfree(sgt); 673 } 674 675 static void tegra_gem_prime_release(struct dma_buf *buf) 676 { 677 drm_gem_dmabuf_release(buf); 678 } 679 680 static int tegra_gem_prime_begin_cpu_access(struct dma_buf *buf, 681 enum dma_data_direction direction) 682 { 683 struct drm_gem_object *gem = buf->priv; 684 struct tegra_bo *bo = to_tegra_bo(gem); 685 struct drm_device *drm = gem->dev; 686 687 if (bo->pages) 688 dma_sync_sgtable_for_cpu(drm->dev, bo->sgt, DMA_FROM_DEVICE); 689 690 return 0; 691 } 692 693 static int tegra_gem_prime_end_cpu_access(struct dma_buf *buf, 694 enum dma_data_direction direction) 695 { 696 struct drm_gem_object *gem = buf->priv; 697 struct tegra_bo *bo = to_tegra_bo(gem); 698 struct drm_device *drm = gem->dev; 699 700 if (bo->pages) 701 dma_sync_sgtable_for_device(drm->dev, bo->sgt, DMA_TO_DEVICE); 702 703 return 0; 704 } 705 706 static int tegra_gem_prime_mmap(struct dma_buf *buf, struct vm_area_struct *vma) 707 { 708 struct drm_gem_object *gem = buf->priv; 709 int err; 710 711 err = drm_gem_mmap_obj(gem, gem->size, vma); 712 if (err < 0) 713 return err; 714 715 return __tegra_gem_mmap(gem, vma); 716 } 717 718 static int tegra_gem_prime_vmap(struct dma_buf *buf, struct iosys_map *map) 719 { 720 struct drm_gem_object *gem = buf->priv; 721 struct tegra_bo *bo = to_tegra_bo(gem); 722 void *vaddr; 723 724 vaddr = tegra_bo_mmap(&bo->base); 725 if (IS_ERR(vaddr)) 726 return PTR_ERR(vaddr); 727 728 iosys_map_set_vaddr(map, vaddr); 729 730 return 0; 731 } 732 733 static void tegra_gem_prime_vunmap(struct dma_buf *buf, struct iosys_map *map) 734 { 735 struct drm_gem_object *gem = buf->priv; 736 struct tegra_bo *bo = to_tegra_bo(gem); 737 738 tegra_bo_munmap(&bo->base, map->vaddr); 739 } 740 741 static const struct dma_buf_ops tegra_gem_prime_dmabuf_ops = { 742 .map_dma_buf = tegra_gem_prime_map_dma_buf, 743 .unmap_dma_buf = tegra_gem_prime_unmap_dma_buf, 744 .release = tegra_gem_prime_release, 745 .begin_cpu_access = tegra_gem_prime_begin_cpu_access, 746 .end_cpu_access = tegra_gem_prime_end_cpu_access, 747 .mmap = tegra_gem_prime_mmap, 748 .vmap = tegra_gem_prime_vmap, 749 .vunmap = tegra_gem_prime_vunmap, 750 }; 751 752 struct dma_buf *tegra_gem_prime_export(struct drm_gem_object *gem, 753 int flags) 754 { 755 DEFINE_DMA_BUF_EXPORT_INFO(exp_info); 756 757 exp_info.exp_name = KBUILD_MODNAME; 758 exp_info.owner = gem->dev->driver->fops->owner; 759 exp_info.ops = &tegra_gem_prime_dmabuf_ops; 760 exp_info.size = gem->size; 761 exp_info.flags = flags; 762 exp_info.priv = gem; 763 764 return drm_gem_dmabuf_export(gem->dev, &exp_info); 765 } 766 767 struct drm_gem_object *tegra_gem_prime_import(struct drm_device *drm, 768 struct dma_buf *buf) 769 { 770 struct tegra_bo *bo; 771 772 if (buf->ops == &tegra_gem_prime_dmabuf_ops) { 773 struct drm_gem_object *gem = buf->priv; 774 775 if (gem->dev == drm) { 776 drm_gem_object_get(gem); 777 return gem; 778 } 779 } 780 781 bo = tegra_bo_import(drm, buf); 782 if (IS_ERR(bo)) 783 return ERR_CAST(bo); 784 785 return &bo->gem; 786 } 787 788 struct host1x_bo *tegra_gem_lookup(struct drm_file *file, u32 handle) 789 { 790 struct drm_gem_object *gem; 791 struct tegra_bo *bo; 792 793 gem = drm_gem_object_lookup(file, handle); 794 if (!gem) 795 return NULL; 796 797 bo = to_tegra_bo(gem); 798 return &bo->base; 799 } 800