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_prime.h> 20 #include <drm/tegra_drm.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(sizeof(*map), GFP_KERNEL); 68 if (!map) 69 return ERR_PTR(-ENOMEM); 70 71 kref_init(&map->ref); 72 map->bo = host1x_bo_get(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 (gem->import_attach) { 80 struct dma_buf *buf = gem->import_attach->dmabuf; 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(sizeof(*map->sgt), GFP_KERNEL); 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 host1x_bo_put(map->bo); 174 kfree(map); 175 } 176 177 static void *tegra_bo_mmap(struct host1x_bo *bo) 178 { 179 struct tegra_bo *obj = host1x_to_tegra_bo(bo); 180 struct iosys_map map; 181 int ret; 182 183 if (obj->vaddr) 184 return obj->vaddr; 185 186 if (obj->gem.import_attach) { 187 ret = dma_buf_vmap_unlocked(obj->gem.import_attach->dmabuf, &map); 188 return ret ? NULL : map.vaddr; 189 } 190 191 return vmap(obj->pages, obj->num_pages, VM_MAP, pgprot_writecombine(PAGE_KERNEL)); 192 } 193 194 static void tegra_bo_munmap(struct host1x_bo *bo, void *addr) 195 { 196 struct tegra_bo *obj = host1x_to_tegra_bo(bo); 197 struct iosys_map map = IOSYS_MAP_INIT_VADDR(addr); 198 199 if (obj->vaddr) 200 return; 201 202 if (obj->gem.import_attach) 203 return dma_buf_vunmap_unlocked(obj->gem.import_attach->dmabuf, &map); 204 205 vunmap(addr); 206 } 207 208 static struct host1x_bo *tegra_bo_get(struct host1x_bo *bo) 209 { 210 struct tegra_bo *obj = host1x_to_tegra_bo(bo); 211 212 drm_gem_object_get(&obj->gem); 213 214 return bo; 215 } 216 217 static const struct host1x_bo_ops tegra_bo_ops = { 218 .get = tegra_bo_get, 219 .put = tegra_bo_put, 220 .pin = tegra_bo_pin, 221 .unpin = tegra_bo_unpin, 222 .mmap = tegra_bo_mmap, 223 .munmap = tegra_bo_munmap, 224 }; 225 226 static int tegra_bo_iommu_map(struct tegra_drm *tegra, struct tegra_bo *bo) 227 { 228 int prot = IOMMU_READ | IOMMU_WRITE; 229 int err; 230 231 if (bo->mm) 232 return -EBUSY; 233 234 bo->mm = kzalloc(sizeof(*bo->mm), GFP_KERNEL); 235 if (!bo->mm) 236 return -ENOMEM; 237 238 mutex_lock(&tegra->mm_lock); 239 240 err = drm_mm_insert_node_generic(&tegra->mm, 241 bo->mm, bo->gem.size, PAGE_SIZE, 0, 0); 242 if (err < 0) { 243 dev_err(tegra->drm->dev, "out of I/O virtual memory: %d\n", 244 err); 245 goto unlock; 246 } 247 248 bo->iova = bo->mm->start; 249 250 bo->size = iommu_map_sgtable(tegra->domain, bo->iova, bo->sgt, prot); 251 if (!bo->size) { 252 dev_err(tegra->drm->dev, "failed to map buffer\n"); 253 err = -ENOMEM; 254 goto remove; 255 } 256 257 mutex_unlock(&tegra->mm_lock); 258 259 return 0; 260 261 remove: 262 drm_mm_remove_node(bo->mm); 263 unlock: 264 mutex_unlock(&tegra->mm_lock); 265 kfree(bo->mm); 266 return err; 267 } 268 269 static int tegra_bo_iommu_unmap(struct tegra_drm *tegra, struct tegra_bo *bo) 270 { 271 if (!bo->mm) 272 return 0; 273 274 mutex_lock(&tegra->mm_lock); 275 iommu_unmap(tegra->domain, bo->iova, bo->size); 276 drm_mm_remove_node(bo->mm); 277 mutex_unlock(&tegra->mm_lock); 278 279 kfree(bo->mm); 280 281 return 0; 282 } 283 284 static const struct drm_gem_object_funcs tegra_gem_object_funcs = { 285 .free = tegra_bo_free_object, 286 .export = tegra_gem_prime_export, 287 .vm_ops = &tegra_bo_vm_ops, 288 }; 289 290 static struct tegra_bo *tegra_bo_alloc_object(struct drm_device *drm, 291 size_t size) 292 { 293 struct tegra_bo *bo; 294 int err; 295 296 bo = kzalloc(sizeof(*bo), GFP_KERNEL); 297 if (!bo) 298 return ERR_PTR(-ENOMEM); 299 300 bo->gem.funcs = &tegra_gem_object_funcs; 301 302 host1x_bo_init(&bo->base, &tegra_bo_ops); 303 size = round_up(size, PAGE_SIZE); 304 305 err = drm_gem_object_init(drm, &bo->gem, size); 306 if (err < 0) 307 goto free; 308 309 err = drm_gem_create_mmap_offset(&bo->gem); 310 if (err < 0) 311 goto release; 312 313 return bo; 314 315 release: 316 drm_gem_object_release(&bo->gem); 317 free: 318 kfree(bo); 319 return ERR_PTR(err); 320 } 321 322 static void tegra_bo_free(struct drm_device *drm, struct tegra_bo *bo) 323 { 324 if (bo->pages) { 325 dma_unmap_sgtable(drm->dev, bo->sgt, DMA_FROM_DEVICE, 0); 326 drm_gem_put_pages(&bo->gem, bo->pages, true, true); 327 sg_free_table(bo->sgt); 328 kfree(bo->sgt); 329 } else if (bo->vaddr) { 330 dma_free_wc(drm->dev, bo->gem.size, bo->vaddr, bo->iova); 331 } 332 } 333 334 static int tegra_bo_get_pages(struct drm_device *drm, struct tegra_bo *bo) 335 { 336 int err; 337 338 bo->pages = drm_gem_get_pages(&bo->gem); 339 if (IS_ERR(bo->pages)) 340 return PTR_ERR(bo->pages); 341 342 bo->num_pages = bo->gem.size >> PAGE_SHIFT; 343 344 bo->sgt = drm_prime_pages_to_sg(bo->gem.dev, bo->pages, bo->num_pages); 345 if (IS_ERR(bo->sgt)) { 346 err = PTR_ERR(bo->sgt); 347 goto put_pages; 348 } 349 350 err = dma_map_sgtable(drm->dev, bo->sgt, DMA_FROM_DEVICE, 0); 351 if (err) 352 goto free_sgt; 353 354 return 0; 355 356 free_sgt: 357 sg_free_table(bo->sgt); 358 kfree(bo->sgt); 359 put_pages: 360 drm_gem_put_pages(&bo->gem, bo->pages, false, false); 361 return err; 362 } 363 364 static int tegra_bo_alloc(struct drm_device *drm, struct tegra_bo *bo) 365 { 366 struct tegra_drm *tegra = drm->dev_private; 367 int err; 368 369 if (tegra->domain) { 370 err = tegra_bo_get_pages(drm, bo); 371 if (err < 0) 372 return err; 373 374 err = tegra_bo_iommu_map(tegra, bo); 375 if (err < 0) { 376 tegra_bo_free(drm, bo); 377 return err; 378 } 379 } else { 380 size_t size = bo->gem.size; 381 382 bo->vaddr = dma_alloc_wc(drm->dev, size, &bo->iova, 383 GFP_KERNEL | __GFP_NOWARN); 384 if (!bo->vaddr) { 385 dev_err(drm->dev, 386 "failed to allocate buffer of size %zu\n", 387 size); 388 return -ENOMEM; 389 } 390 } 391 392 return 0; 393 } 394 395 struct tegra_bo *tegra_bo_create(struct drm_device *drm, size_t size, 396 unsigned long flags) 397 { 398 struct tegra_bo *bo; 399 int err; 400 401 bo = tegra_bo_alloc_object(drm, size); 402 if (IS_ERR(bo)) 403 return bo; 404 405 err = tegra_bo_alloc(drm, bo); 406 if (err < 0) 407 goto release; 408 409 if (flags & DRM_TEGRA_GEM_CREATE_TILED) 410 bo->tiling.mode = TEGRA_BO_TILING_MODE_TILED; 411 412 if (flags & DRM_TEGRA_GEM_CREATE_BOTTOM_UP) 413 bo->flags |= TEGRA_BO_BOTTOM_UP; 414 415 return bo; 416 417 release: 418 drm_gem_object_release(&bo->gem); 419 kfree(bo); 420 return ERR_PTR(err); 421 } 422 423 struct tegra_bo *tegra_bo_create_with_handle(struct drm_file *file, 424 struct drm_device *drm, 425 size_t size, 426 unsigned long flags, 427 u32 *handle) 428 { 429 struct tegra_bo *bo; 430 int err; 431 432 bo = tegra_bo_create(drm, size, flags); 433 if (IS_ERR(bo)) 434 return bo; 435 436 err = drm_gem_handle_create(file, &bo->gem, handle); 437 if (err) { 438 tegra_bo_free_object(&bo->gem); 439 return ERR_PTR(err); 440 } 441 442 drm_gem_object_put(&bo->gem); 443 444 return bo; 445 } 446 447 static struct tegra_bo *tegra_bo_import(struct drm_device *drm, 448 struct dma_buf *buf) 449 { 450 struct tegra_drm *tegra = drm->dev_private; 451 struct dma_buf_attachment *attach; 452 struct tegra_bo *bo; 453 int err; 454 455 bo = tegra_bo_alloc_object(drm, buf->size); 456 if (IS_ERR(bo)) 457 return bo; 458 459 attach = dma_buf_attach(buf, drm->dev); 460 if (IS_ERR(attach)) { 461 err = PTR_ERR(attach); 462 goto free; 463 } 464 465 get_dma_buf(buf); 466 467 bo->sgt = dma_buf_map_attachment_unlocked(attach, DMA_TO_DEVICE); 468 if (IS_ERR(bo->sgt)) { 469 err = PTR_ERR(bo->sgt); 470 goto detach; 471 } 472 473 if (tegra->domain) { 474 err = tegra_bo_iommu_map(tegra, bo); 475 if (err < 0) 476 goto detach; 477 } 478 479 bo->gem.import_attach = attach; 480 481 return bo; 482 483 detach: 484 if (!IS_ERR_OR_NULL(bo->sgt)) 485 dma_buf_unmap_attachment_unlocked(attach, bo->sgt, DMA_TO_DEVICE); 486 487 dma_buf_detach(buf, attach); 488 dma_buf_put(buf); 489 free: 490 drm_gem_object_release(&bo->gem); 491 kfree(bo); 492 return ERR_PTR(err); 493 } 494 495 void tegra_bo_free_object(struct drm_gem_object *gem) 496 { 497 struct tegra_drm *tegra = gem->dev->dev_private; 498 struct host1x_bo_mapping *mapping, *tmp; 499 struct tegra_bo *bo = to_tegra_bo(gem); 500 501 /* remove all mappings of this buffer object from any caches */ 502 list_for_each_entry_safe(mapping, tmp, &bo->base.mappings, list) { 503 if (mapping->cache) 504 host1x_bo_unpin(mapping); 505 else 506 dev_err(gem->dev->dev, "mapping %p stale for device %s\n", mapping, 507 dev_name(mapping->dev)); 508 } 509 510 if (tegra->domain) 511 tegra_bo_iommu_unmap(tegra, bo); 512 513 if (gem->import_attach) { 514 dma_buf_unmap_attachment_unlocked(gem->import_attach, bo->sgt, 515 DMA_TO_DEVICE); 516 drm_prime_gem_destroy(gem, NULL); 517 } else { 518 tegra_bo_free(gem->dev, bo); 519 } 520 521 drm_gem_object_release(gem); 522 kfree(bo); 523 } 524 525 int tegra_bo_dumb_create(struct drm_file *file, struct drm_device *drm, 526 struct drm_mode_create_dumb *args) 527 { 528 unsigned int min_pitch = DIV_ROUND_UP(args->width * args->bpp, 8); 529 struct tegra_drm *tegra = drm->dev_private; 530 struct tegra_bo *bo; 531 532 args->pitch = round_up(min_pitch, tegra->pitch_align); 533 args->size = args->pitch * args->height; 534 535 bo = tegra_bo_create_with_handle(file, drm, args->size, 0, 536 &args->handle); 537 if (IS_ERR(bo)) 538 return PTR_ERR(bo); 539 540 return 0; 541 } 542 543 static vm_fault_t tegra_bo_fault(struct vm_fault *vmf) 544 { 545 struct vm_area_struct *vma = vmf->vma; 546 struct drm_gem_object *gem = vma->vm_private_data; 547 struct tegra_bo *bo = to_tegra_bo(gem); 548 struct page *page; 549 pgoff_t offset; 550 551 if (!bo->pages) 552 return VM_FAULT_SIGBUS; 553 554 offset = (vmf->address - vma->vm_start) >> PAGE_SHIFT; 555 page = bo->pages[offset]; 556 557 return vmf_insert_page(vma, vmf->address, page); 558 } 559 560 const struct vm_operations_struct tegra_bo_vm_ops = { 561 .fault = tegra_bo_fault, 562 .open = drm_gem_vm_open, 563 .close = drm_gem_vm_close, 564 }; 565 566 int __tegra_gem_mmap(struct drm_gem_object *gem, struct vm_area_struct *vma) 567 { 568 struct tegra_bo *bo = to_tegra_bo(gem); 569 570 if (!bo->pages) { 571 unsigned long vm_pgoff = vma->vm_pgoff; 572 int err; 573 574 /* 575 * Clear the VM_PFNMAP flag that was set by drm_gem_mmap(), 576 * and set the vm_pgoff (used as a fake buffer offset by DRM) 577 * to 0 as we want to map the whole buffer. 578 */ 579 vm_flags_clear(vma, VM_PFNMAP); 580 vma->vm_pgoff = 0; 581 582 err = dma_mmap_wc(gem->dev->dev, vma, bo->vaddr, bo->iova, 583 gem->size); 584 if (err < 0) { 585 drm_gem_vm_close(vma); 586 return err; 587 } 588 589 vma->vm_pgoff = vm_pgoff; 590 } else { 591 pgprot_t prot = vm_get_page_prot(vma->vm_flags); 592 593 vm_flags_mod(vma, VM_MIXEDMAP, VM_PFNMAP); 594 595 vma->vm_page_prot = pgprot_writecombine(prot); 596 } 597 598 return 0; 599 } 600 601 int tegra_drm_mmap(struct file *file, struct vm_area_struct *vma) 602 { 603 struct drm_gem_object *gem; 604 int err; 605 606 err = drm_gem_mmap(file, vma); 607 if (err < 0) 608 return err; 609 610 gem = vma->vm_private_data; 611 612 return __tegra_gem_mmap(gem, vma); 613 } 614 615 static struct sg_table * 616 tegra_gem_prime_map_dma_buf(struct dma_buf_attachment *attach, 617 enum dma_data_direction dir) 618 { 619 struct drm_gem_object *gem = attach->dmabuf->priv; 620 struct tegra_bo *bo = to_tegra_bo(gem); 621 struct sg_table *sgt; 622 623 sgt = kmalloc(sizeof(*sgt), GFP_KERNEL); 624 if (!sgt) 625 return NULL; 626 627 if (bo->pages) { 628 if (sg_alloc_table_from_pages(sgt, bo->pages, bo->num_pages, 629 0, gem->size, GFP_KERNEL) < 0) 630 goto free; 631 } else { 632 if (dma_get_sgtable(attach->dev, sgt, bo->vaddr, bo->iova, 633 gem->size) < 0) 634 goto free; 635 } 636 637 if (dma_map_sgtable(attach->dev, sgt, dir, 0)) 638 goto free; 639 640 return sgt; 641 642 free: 643 sg_free_table(sgt); 644 kfree(sgt); 645 return NULL; 646 } 647 648 static void tegra_gem_prime_unmap_dma_buf(struct dma_buf_attachment *attach, 649 struct sg_table *sgt, 650 enum dma_data_direction dir) 651 { 652 struct drm_gem_object *gem = attach->dmabuf->priv; 653 struct tegra_bo *bo = to_tegra_bo(gem); 654 655 if (bo->pages) 656 dma_unmap_sgtable(attach->dev, sgt, dir, 0); 657 658 sg_free_table(sgt); 659 kfree(sgt); 660 } 661 662 static void tegra_gem_prime_release(struct dma_buf *buf) 663 { 664 drm_gem_dmabuf_release(buf); 665 } 666 667 static int tegra_gem_prime_begin_cpu_access(struct dma_buf *buf, 668 enum dma_data_direction direction) 669 { 670 struct drm_gem_object *gem = buf->priv; 671 struct tegra_bo *bo = to_tegra_bo(gem); 672 struct drm_device *drm = gem->dev; 673 674 if (bo->pages) 675 dma_sync_sgtable_for_cpu(drm->dev, bo->sgt, DMA_FROM_DEVICE); 676 677 return 0; 678 } 679 680 static int tegra_gem_prime_end_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_device(drm->dev, bo->sgt, DMA_TO_DEVICE); 689 690 return 0; 691 } 692 693 static int tegra_gem_prime_mmap(struct dma_buf *buf, struct vm_area_struct *vma) 694 { 695 struct drm_gem_object *gem = buf->priv; 696 int err; 697 698 err = drm_gem_mmap_obj(gem, gem->size, vma); 699 if (err < 0) 700 return err; 701 702 return __tegra_gem_mmap(gem, vma); 703 } 704 705 static int tegra_gem_prime_vmap(struct dma_buf *buf, struct iosys_map *map) 706 { 707 struct drm_gem_object *gem = buf->priv; 708 struct tegra_bo *bo = to_tegra_bo(gem); 709 void *vaddr; 710 711 vaddr = tegra_bo_mmap(&bo->base); 712 if (IS_ERR(vaddr)) 713 return PTR_ERR(vaddr); 714 715 iosys_map_set_vaddr(map, vaddr); 716 717 return 0; 718 } 719 720 static void tegra_gem_prime_vunmap(struct dma_buf *buf, struct iosys_map *map) 721 { 722 struct drm_gem_object *gem = buf->priv; 723 struct tegra_bo *bo = to_tegra_bo(gem); 724 725 tegra_bo_munmap(&bo->base, map->vaddr); 726 } 727 728 static const struct dma_buf_ops tegra_gem_prime_dmabuf_ops = { 729 .map_dma_buf = tegra_gem_prime_map_dma_buf, 730 .unmap_dma_buf = tegra_gem_prime_unmap_dma_buf, 731 .release = tegra_gem_prime_release, 732 .begin_cpu_access = tegra_gem_prime_begin_cpu_access, 733 .end_cpu_access = tegra_gem_prime_end_cpu_access, 734 .mmap = tegra_gem_prime_mmap, 735 .vmap = tegra_gem_prime_vmap, 736 .vunmap = tegra_gem_prime_vunmap, 737 }; 738 739 struct dma_buf *tegra_gem_prime_export(struct drm_gem_object *gem, 740 int flags) 741 { 742 DEFINE_DMA_BUF_EXPORT_INFO(exp_info); 743 744 exp_info.exp_name = KBUILD_MODNAME; 745 exp_info.owner = gem->dev->driver->fops->owner; 746 exp_info.ops = &tegra_gem_prime_dmabuf_ops; 747 exp_info.size = gem->size; 748 exp_info.flags = flags; 749 exp_info.priv = gem; 750 751 return drm_gem_dmabuf_export(gem->dev, &exp_info); 752 } 753 754 struct drm_gem_object *tegra_gem_prime_import(struct drm_device *drm, 755 struct dma_buf *buf) 756 { 757 struct tegra_bo *bo; 758 759 if (buf->ops == &tegra_gem_prime_dmabuf_ops) { 760 struct drm_gem_object *gem = buf->priv; 761 762 if (gem->dev == drm) { 763 drm_gem_object_get(gem); 764 return gem; 765 } 766 } 767 768 bo = tegra_bo_import(drm, buf); 769 if (IS_ERR(bo)) 770 return ERR_CAST(bo); 771 772 return &bo->gem; 773 } 774 775 struct host1x_bo *tegra_gem_lookup(struct drm_file *file, u32 handle) 776 { 777 struct drm_gem_object *gem; 778 struct tegra_bo *bo; 779 780 gem = drm_gem_object_lookup(file, handle); 781 if (!gem) 782 return NULL; 783 784 bo = to_tegra_bo(gem); 785 return &bo->base; 786 } 787