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