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