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 = { 0 }; 181 int ret; 182 183 if (obj->vaddr) { 184 return obj->vaddr; 185 } else if (obj->gem.import_attach) { 186 ret = dma_buf_vmap_unlocked(obj->gem.import_attach->dmabuf, &map); 187 return ret ? NULL : map.vaddr; 188 } else { 189 return vmap(obj->pages, obj->num_pages, VM_MAP, 190 pgprot_writecombine(PAGE_KERNEL)); 191 } 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 else if (obj->gem.import_attach) 202 dma_buf_vunmap_unlocked(obj->gem.import_attach->dmabuf, &map); 203 else 204 vunmap(addr); 205 } 206 207 static struct host1x_bo *tegra_bo_get(struct host1x_bo *bo) 208 { 209 struct tegra_bo *obj = host1x_to_tegra_bo(bo); 210 211 drm_gem_object_get(&obj->gem); 212 213 return bo; 214 } 215 216 static const struct host1x_bo_ops tegra_bo_ops = { 217 .get = tegra_bo_get, 218 .put = tegra_bo_put, 219 .pin = tegra_bo_pin, 220 .unpin = tegra_bo_unpin, 221 .mmap = tegra_bo_mmap, 222 .munmap = tegra_bo_munmap, 223 }; 224 225 static int tegra_bo_iommu_map(struct tegra_drm *tegra, struct tegra_bo *bo) 226 { 227 int prot = IOMMU_READ | IOMMU_WRITE; 228 int err; 229 230 if (bo->mm) 231 return -EBUSY; 232 233 bo->mm = kzalloc(sizeof(*bo->mm), GFP_KERNEL); 234 if (!bo->mm) 235 return -ENOMEM; 236 237 mutex_lock(&tegra->mm_lock); 238 239 err = drm_mm_insert_node_generic(&tegra->mm, 240 bo->mm, bo->gem.size, PAGE_SIZE, 0, 0); 241 if (err < 0) { 242 dev_err(tegra->drm->dev, "out of I/O virtual memory: %d\n", 243 err); 244 goto unlock; 245 } 246 247 bo->iova = bo->mm->start; 248 249 bo->size = iommu_map_sgtable(tegra->domain, bo->iova, bo->sgt, prot); 250 if (!bo->size) { 251 dev_err(tegra->drm->dev, "failed to map buffer\n"); 252 err = -ENOMEM; 253 goto remove; 254 } 255 256 mutex_unlock(&tegra->mm_lock); 257 258 return 0; 259 260 remove: 261 drm_mm_remove_node(bo->mm); 262 unlock: 263 mutex_unlock(&tegra->mm_lock); 264 kfree(bo->mm); 265 return err; 266 } 267 268 static int tegra_bo_iommu_unmap(struct tegra_drm *tegra, struct tegra_bo *bo) 269 { 270 if (!bo->mm) 271 return 0; 272 273 mutex_lock(&tegra->mm_lock); 274 iommu_unmap(tegra->domain, bo->iova, bo->size); 275 drm_mm_remove_node(bo->mm); 276 mutex_unlock(&tegra->mm_lock); 277 278 kfree(bo->mm); 279 280 return 0; 281 } 282 283 static const struct drm_gem_object_funcs tegra_gem_object_funcs = { 284 .free = tegra_bo_free_object, 285 .export = tegra_gem_prime_export, 286 .vm_ops = &tegra_bo_vm_ops, 287 }; 288 289 static struct tegra_bo *tegra_bo_alloc_object(struct drm_device *drm, 290 size_t size) 291 { 292 struct tegra_bo *bo; 293 int err; 294 295 bo = kzalloc(sizeof(*bo), GFP_KERNEL); 296 if (!bo) 297 return ERR_PTR(-ENOMEM); 298 299 bo->gem.funcs = &tegra_gem_object_funcs; 300 301 host1x_bo_init(&bo->base, &tegra_bo_ops); 302 size = round_up(size, PAGE_SIZE); 303 304 err = drm_gem_object_init(drm, &bo->gem, size); 305 if (err < 0) 306 goto free; 307 308 err = drm_gem_create_mmap_offset(&bo->gem); 309 if (err < 0) 310 goto release; 311 312 return bo; 313 314 release: 315 drm_gem_object_release(&bo->gem); 316 free: 317 kfree(bo); 318 return ERR_PTR(err); 319 } 320 321 static void tegra_bo_free(struct drm_device *drm, struct tegra_bo *bo) 322 { 323 if (bo->pages) { 324 dma_unmap_sgtable(drm->dev, bo->sgt, DMA_FROM_DEVICE, 0); 325 drm_gem_put_pages(&bo->gem, bo->pages, true, true); 326 sg_free_table(bo->sgt); 327 kfree(bo->sgt); 328 } else if (bo->vaddr) { 329 dma_free_wc(drm->dev, bo->gem.size, bo->vaddr, bo->iova); 330 } 331 } 332 333 static int tegra_bo_get_pages(struct drm_device *drm, struct tegra_bo *bo) 334 { 335 int err; 336 337 bo->pages = drm_gem_get_pages(&bo->gem); 338 if (IS_ERR(bo->pages)) 339 return PTR_ERR(bo->pages); 340 341 bo->num_pages = bo->gem.size >> PAGE_SHIFT; 342 343 bo->sgt = drm_prime_pages_to_sg(bo->gem.dev, bo->pages, bo->num_pages); 344 if (IS_ERR(bo->sgt)) { 345 err = PTR_ERR(bo->sgt); 346 goto put_pages; 347 } 348 349 err = dma_map_sgtable(drm->dev, bo->sgt, DMA_FROM_DEVICE, 0); 350 if (err) 351 goto free_sgt; 352 353 return 0; 354 355 free_sgt: 356 sg_free_table(bo->sgt); 357 kfree(bo->sgt); 358 put_pages: 359 drm_gem_put_pages(&bo->gem, bo->pages, false, false); 360 return err; 361 } 362 363 static int tegra_bo_alloc(struct drm_device *drm, struct tegra_bo *bo) 364 { 365 struct tegra_drm *tegra = drm->dev_private; 366 int err; 367 368 if (tegra->domain) { 369 err = tegra_bo_get_pages(drm, bo); 370 if (err < 0) 371 return err; 372 373 err = tegra_bo_iommu_map(tegra, bo); 374 if (err < 0) { 375 tegra_bo_free(drm, bo); 376 return err; 377 } 378 } else { 379 size_t size = bo->gem.size; 380 381 bo->vaddr = dma_alloc_wc(drm->dev, size, &bo->iova, 382 GFP_KERNEL | __GFP_NOWARN); 383 if (!bo->vaddr) { 384 dev_err(drm->dev, 385 "failed to allocate buffer of size %zu\n", 386 size); 387 return -ENOMEM; 388 } 389 } 390 391 return 0; 392 } 393 394 struct tegra_bo *tegra_bo_create(struct drm_device *drm, size_t size, 395 unsigned long flags) 396 { 397 struct tegra_bo *bo; 398 int err; 399 400 bo = tegra_bo_alloc_object(drm, size); 401 if (IS_ERR(bo)) 402 return bo; 403 404 err = tegra_bo_alloc(drm, bo); 405 if (err < 0) 406 goto release; 407 408 if (flags & DRM_TEGRA_GEM_CREATE_TILED) 409 bo->tiling.mode = TEGRA_BO_TILING_MODE_TILED; 410 411 if (flags & DRM_TEGRA_GEM_CREATE_BOTTOM_UP) 412 bo->flags |= TEGRA_BO_BOTTOM_UP; 413 414 return bo; 415 416 release: 417 drm_gem_object_release(&bo->gem); 418 kfree(bo); 419 return ERR_PTR(err); 420 } 421 422 struct tegra_bo *tegra_bo_create_with_handle(struct drm_file *file, 423 struct drm_device *drm, 424 size_t size, 425 unsigned long flags, 426 u32 *handle) 427 { 428 struct tegra_bo *bo; 429 int err; 430 431 bo = tegra_bo_create(drm, size, flags); 432 if (IS_ERR(bo)) 433 return bo; 434 435 err = drm_gem_handle_create(file, &bo->gem, handle); 436 if (err) { 437 tegra_bo_free_object(&bo->gem); 438 return ERR_PTR(err); 439 } 440 441 drm_gem_object_put(&bo->gem); 442 443 return bo; 444 } 445 446 static struct tegra_bo *tegra_bo_import(struct drm_device *drm, 447 struct dma_buf *buf) 448 { 449 struct tegra_drm *tegra = drm->dev_private; 450 struct dma_buf_attachment *attach; 451 struct tegra_bo *bo; 452 int err; 453 454 bo = tegra_bo_alloc_object(drm, buf->size); 455 if (IS_ERR(bo)) 456 return bo; 457 458 attach = dma_buf_attach(buf, drm->dev); 459 if (IS_ERR(attach)) { 460 err = PTR_ERR(attach); 461 goto free; 462 } 463 464 get_dma_buf(buf); 465 466 bo->sgt = dma_buf_map_attachment_unlocked(attach, DMA_TO_DEVICE); 467 if (IS_ERR(bo->sgt)) { 468 err = PTR_ERR(bo->sgt); 469 goto detach; 470 } 471 472 if (tegra->domain) { 473 err = tegra_bo_iommu_map(tegra, bo); 474 if (err < 0) 475 goto detach; 476 } 477 478 bo->gem.import_attach = attach; 479 480 return bo; 481 482 detach: 483 if (!IS_ERR_OR_NULL(bo->sgt)) 484 dma_buf_unmap_attachment_unlocked(attach, bo->sgt, DMA_TO_DEVICE); 485 486 dma_buf_detach(buf, attach); 487 dma_buf_put(buf); 488 free: 489 drm_gem_object_release(&bo->gem); 490 kfree(bo); 491 return ERR_PTR(err); 492 } 493 494 void tegra_bo_free_object(struct drm_gem_object *gem) 495 { 496 struct tegra_drm *tegra = gem->dev->dev_private; 497 struct host1x_bo_mapping *mapping, *tmp; 498 struct tegra_bo *bo = to_tegra_bo(gem); 499 500 /* remove all mappings of this buffer object from any caches */ 501 list_for_each_entry_safe(mapping, tmp, &bo->base.mappings, list) { 502 if (mapping->cache) 503 host1x_bo_unpin(mapping); 504 else 505 dev_err(gem->dev->dev, "mapping %p stale for device %s\n", mapping, 506 dev_name(mapping->dev)); 507 } 508 509 if (tegra->domain) 510 tegra_bo_iommu_unmap(tegra, bo); 511 512 if (gem->import_attach) { 513 dma_buf_unmap_attachment_unlocked(gem->import_attach, bo->sgt, 514 DMA_TO_DEVICE); 515 drm_prime_gem_destroy(gem, NULL); 516 } else { 517 tegra_bo_free(gem->dev, bo); 518 } 519 520 drm_gem_object_release(gem); 521 kfree(bo); 522 } 523 524 int tegra_bo_dumb_create(struct drm_file *file, struct drm_device *drm, 525 struct drm_mode_create_dumb *args) 526 { 527 unsigned int min_pitch = DIV_ROUND_UP(args->width * args->bpp, 8); 528 struct tegra_drm *tegra = drm->dev_private; 529 struct tegra_bo *bo; 530 531 args->pitch = round_up(min_pitch, tegra->pitch_align); 532 args->size = args->pitch * args->height; 533 534 bo = tegra_bo_create_with_handle(file, drm, args->size, 0, 535 &args->handle); 536 if (IS_ERR(bo)) 537 return PTR_ERR(bo); 538 539 return 0; 540 } 541 542 static vm_fault_t tegra_bo_fault(struct vm_fault *vmf) 543 { 544 struct vm_area_struct *vma = vmf->vma; 545 struct drm_gem_object *gem = vma->vm_private_data; 546 struct tegra_bo *bo = to_tegra_bo(gem); 547 struct page *page; 548 pgoff_t offset; 549 550 if (!bo->pages) 551 return VM_FAULT_SIGBUS; 552 553 offset = (vmf->address - vma->vm_start) >> PAGE_SHIFT; 554 page = bo->pages[offset]; 555 556 return vmf_insert_page(vma, vmf->address, page); 557 } 558 559 const struct vm_operations_struct tegra_bo_vm_ops = { 560 .fault = tegra_bo_fault, 561 .open = drm_gem_vm_open, 562 .close = drm_gem_vm_close, 563 }; 564 565 int __tegra_gem_mmap(struct drm_gem_object *gem, struct vm_area_struct *vma) 566 { 567 struct tegra_bo *bo = to_tegra_bo(gem); 568 569 if (!bo->pages) { 570 unsigned long vm_pgoff = vma->vm_pgoff; 571 int err; 572 573 /* 574 * Clear the VM_PFNMAP flag that was set by drm_gem_mmap(), 575 * and set the vm_pgoff (used as a fake buffer offset by DRM) 576 * to 0 as we want to map the whole buffer. 577 */ 578 vm_flags_clear(vma, VM_PFNMAP); 579 vma->vm_pgoff = 0; 580 581 err = dma_mmap_wc(gem->dev->dev, vma, bo->vaddr, bo->iova, 582 gem->size); 583 if (err < 0) { 584 drm_gem_vm_close(vma); 585 return err; 586 } 587 588 vma->vm_pgoff = vm_pgoff; 589 } else { 590 pgprot_t prot = vm_get_page_prot(vma->vm_flags); 591 592 vm_flags_mod(vma, VM_MIXEDMAP, VM_PFNMAP); 593 594 vma->vm_page_prot = pgprot_writecombine(prot); 595 } 596 597 return 0; 598 } 599 600 int tegra_drm_mmap(struct file *file, struct vm_area_struct *vma) 601 { 602 struct drm_gem_object *gem; 603 int err; 604 605 err = drm_gem_mmap(file, vma); 606 if (err < 0) 607 return err; 608 609 gem = vma->vm_private_data; 610 611 return __tegra_gem_mmap(gem, vma); 612 } 613 614 static struct sg_table * 615 tegra_gem_prime_map_dma_buf(struct dma_buf_attachment *attach, 616 enum dma_data_direction dir) 617 { 618 struct drm_gem_object *gem = attach->dmabuf->priv; 619 struct tegra_bo *bo = to_tegra_bo(gem); 620 struct sg_table *sgt; 621 622 sgt = kmalloc(sizeof(*sgt), GFP_KERNEL); 623 if (!sgt) 624 return NULL; 625 626 if (bo->pages) { 627 if (sg_alloc_table_from_pages(sgt, bo->pages, bo->num_pages, 628 0, gem->size, GFP_KERNEL) < 0) 629 goto free; 630 } else { 631 if (dma_get_sgtable(attach->dev, sgt, bo->vaddr, bo->iova, 632 gem->size) < 0) 633 goto free; 634 } 635 636 if (dma_map_sgtable(attach->dev, sgt, dir, 0)) 637 goto free; 638 639 return sgt; 640 641 free: 642 sg_free_table(sgt); 643 kfree(sgt); 644 return NULL; 645 } 646 647 static void tegra_gem_prime_unmap_dma_buf(struct dma_buf_attachment *attach, 648 struct sg_table *sgt, 649 enum dma_data_direction dir) 650 { 651 struct drm_gem_object *gem = attach->dmabuf->priv; 652 struct tegra_bo *bo = to_tegra_bo(gem); 653 654 if (bo->pages) 655 dma_unmap_sgtable(attach->dev, sgt, dir, 0); 656 657 sg_free_table(sgt); 658 kfree(sgt); 659 } 660 661 static void tegra_gem_prime_release(struct dma_buf *buf) 662 { 663 drm_gem_dmabuf_release(buf); 664 } 665 666 static int tegra_gem_prime_begin_cpu_access(struct dma_buf *buf, 667 enum dma_data_direction direction) 668 { 669 struct drm_gem_object *gem = buf->priv; 670 struct tegra_bo *bo = to_tegra_bo(gem); 671 struct drm_device *drm = gem->dev; 672 673 if (bo->pages) 674 dma_sync_sgtable_for_cpu(drm->dev, bo->sgt, DMA_FROM_DEVICE); 675 676 return 0; 677 } 678 679 static int tegra_gem_prime_end_cpu_access(struct dma_buf *buf, 680 enum dma_data_direction direction) 681 { 682 struct drm_gem_object *gem = buf->priv; 683 struct tegra_bo *bo = to_tegra_bo(gem); 684 struct drm_device *drm = gem->dev; 685 686 if (bo->pages) 687 dma_sync_sgtable_for_device(drm->dev, bo->sgt, DMA_TO_DEVICE); 688 689 return 0; 690 } 691 692 static int tegra_gem_prime_mmap(struct dma_buf *buf, struct vm_area_struct *vma) 693 { 694 struct drm_gem_object *gem = buf->priv; 695 int err; 696 697 err = drm_gem_mmap_obj(gem, gem->size, vma); 698 if (err < 0) 699 return err; 700 701 return __tegra_gem_mmap(gem, vma); 702 } 703 704 static int tegra_gem_prime_vmap(struct dma_buf *buf, struct iosys_map *map) 705 { 706 struct drm_gem_object *gem = buf->priv; 707 struct tegra_bo *bo = to_tegra_bo(gem); 708 void *vaddr; 709 710 vaddr = tegra_bo_mmap(&bo->base); 711 if (IS_ERR(vaddr)) 712 return PTR_ERR(vaddr); 713 714 iosys_map_set_vaddr(map, vaddr); 715 716 return 0; 717 } 718 719 static void tegra_gem_prime_vunmap(struct dma_buf *buf, struct iosys_map *map) 720 { 721 struct drm_gem_object *gem = buf->priv; 722 struct tegra_bo *bo = to_tegra_bo(gem); 723 724 tegra_bo_munmap(&bo->base, map->vaddr); 725 } 726 727 static const struct dma_buf_ops tegra_gem_prime_dmabuf_ops = { 728 .map_dma_buf = tegra_gem_prime_map_dma_buf, 729 .unmap_dma_buf = tegra_gem_prime_unmap_dma_buf, 730 .release = tegra_gem_prime_release, 731 .begin_cpu_access = tegra_gem_prime_begin_cpu_access, 732 .end_cpu_access = tegra_gem_prime_end_cpu_access, 733 .mmap = tegra_gem_prime_mmap, 734 .vmap = tegra_gem_prime_vmap, 735 .vunmap = tegra_gem_prime_vunmap, 736 }; 737 738 struct dma_buf *tegra_gem_prime_export(struct drm_gem_object *gem, 739 int flags) 740 { 741 DEFINE_DMA_BUF_EXPORT_INFO(exp_info); 742 743 exp_info.exp_name = KBUILD_MODNAME; 744 exp_info.owner = gem->dev->driver->fops->owner; 745 exp_info.ops = &tegra_gem_prime_dmabuf_ops; 746 exp_info.size = gem->size; 747 exp_info.flags = flags; 748 exp_info.priv = gem; 749 750 return drm_gem_dmabuf_export(gem->dev, &exp_info); 751 } 752 753 struct drm_gem_object *tegra_gem_prime_import(struct drm_device *drm, 754 struct dma_buf *buf) 755 { 756 struct tegra_bo *bo; 757 758 if (buf->ops == &tegra_gem_prime_dmabuf_ops) { 759 struct drm_gem_object *gem = buf->priv; 760 761 if (gem->dev == drm) { 762 drm_gem_object_get(gem); 763 return gem; 764 } 765 } 766 767 bo = tegra_bo_import(drm, buf); 768 if (IS_ERR(bo)) 769 return ERR_CAST(bo); 770 771 return &bo->gem; 772 } 773 774 struct host1x_bo *tegra_gem_lookup(struct drm_file *file, u32 handle) 775 { 776 struct drm_gem_object *gem; 777 struct tegra_bo *bo; 778 779 gem = drm_gem_object_lookup(file, handle); 780 if (!gem) 781 return NULL; 782 783 bo = to_tegra_bo(gem); 784 return &bo->base; 785 } 786