drivers/gpu/drm/tegra/gem.c

   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 struct host1x_bo *tegra_bo_get(struct host1x_bo *bo)
 150 {
 151         struct tegra_bo *obj = host1x_to_tegra_bo(bo);
 152
 153         drm_gem_object_get(&obj->gem);
 154
 155         return bo;
 156 }
 157
 158 static const struct host1x_bo_ops tegra_bo_ops = {
 159         .get = tegra_bo_get,
 160         .put = tegra_bo_put,
 161         .pin = tegra_bo_pin,
 162         .unpin = tegra_bo_unpin,
 163         .mmap = tegra_bo_mmap,
 164         .munmap = tegra_bo_munmap,
 165 };
 166
 167 static int tegra_bo_iommu_map(struct tegra_drm *tegra, struct tegra_bo *bo)
 168 {
 169         int prot = IOMMU_READ | IOMMU_WRITE;
 170         int err;
 171
 172         if (bo->mm)
 173                 return -EBUSY;
 174
 175         bo->mm = kzalloc(sizeof(*bo->mm), GFP_KERNEL);
 176         if (!bo->mm)
 177                 return -ENOMEM;
 178
 179         mutex_lock(&tegra->mm_lock);
 180
 181         err = drm_mm_insert_node_generic(&tegra->mm,
 182                                          bo->mm, bo->gem.size, PAGE_SIZE, 0, 0);
 183         if (err < 0) {
 184                 dev_err(tegra->drm->dev, "out of I/O virtual memory: %d\n",
 185                         err);
 186                 goto unlock;
 187         }
 188
 189         bo->iova = bo->mm->start;
 190
 191         bo->size = iommu_map_sg(tegra->domain, bo->iova, bo->sgt->sgl,
 192                                 bo->sgt->nents, prot);
 193         if (!bo->size) {
 194                 dev_err(tegra->drm->dev, "failed to map buffer\n");
 195                 err = -ENOMEM;
 196                 goto remove;
 197         }
 198
 199         mutex_unlock(&tegra->mm_lock);
 200
 201         return 0;
 202
 203 remove:
 204         drm_mm_remove_node(bo->mm);
 205 unlock:
 206         mutex_unlock(&tegra->mm_lock);
 207         kfree(bo->mm);
 208         return err;
 209 }
 210
 211 static int tegra_bo_iommu_unmap(struct tegra_drm *tegra, struct tegra_bo *bo)
 212 {
 213         if (!bo->mm)
 214                 return 0;
 215
 216         mutex_lock(&tegra->mm_lock);
 217         iommu_unmap(tegra->domain, bo->iova, bo->size);
 218         drm_mm_remove_node(bo->mm);
 219         mutex_unlock(&tegra->mm_lock);
 220
 221         kfree(bo->mm);
 222
 223         return 0;
 224 }
 225
 226 static struct tegra_bo *tegra_bo_alloc_object(struct drm_device *drm,
 227                                               size_t size)
 228 {
 229         struct tegra_bo *bo;
 230         int err;
 231
 232         bo = kzalloc(sizeof(*bo), GFP_KERNEL);
 233         if (!bo)
 234                 return ERR_PTR(-ENOMEM);
 235
 236         host1x_bo_init(&bo->base, &tegra_bo_ops);
 237         size = round_up(size, PAGE_SIZE);
 238
 239         err = drm_gem_object_init(drm, &bo->gem, size);
 240         if (err < 0)
 241                 goto free;
 242
 243         err = drm_gem_create_mmap_offset(&bo->gem);
 244         if (err < 0)
 245                 goto release;
 246
 247         return bo;
 248
 249 release:
 250         drm_gem_object_release(&bo->gem);
 251 free:
 252         kfree(bo);
 253         return ERR_PTR(err);
 254 }
 255
 256 static void tegra_bo_free(struct drm_device *drm, struct tegra_bo *bo)
 257 {
 258         if (bo->pages) {
 259                 dma_unmap_sg(drm->dev, bo->sgt->sgl, bo->sgt->nents,
 260                              DMA_FROM_DEVICE);
 261                 drm_gem_put_pages(&bo->gem, bo->pages, true, true);
 262                 sg_free_table(bo->sgt);
 263                 kfree(bo->sgt);
 264         } else if (bo->vaddr) {
 265                 dma_free_wc(drm->dev, bo->gem.size, bo->vaddr, bo->iova);
 266         }
 267 }
 268
 269 static int tegra_bo_get_pages(struct drm_device *drm, struct tegra_bo *bo)
 270 {
 271         int err;
 272
 273         bo->pages = drm_gem_get_pages(&bo->gem);
 274         if (IS_ERR(bo->pages))
 275                 return PTR_ERR(bo->pages);
 276
 277         bo->num_pages = bo->gem.size >> PAGE_SHIFT;
 278
 279         bo->sgt = drm_prime_pages_to_sg(bo->pages, bo->num_pages);
 280         if (IS_ERR(bo->sgt)) {
 281                 err = PTR_ERR(bo->sgt);
 282                 goto put_pages;
 283         }
 284
 285         err = dma_map_sg(drm->dev, bo->sgt->sgl, bo->sgt->nents,
 286                          DMA_FROM_DEVICE);
 287         if (err == 0) {
 288                 err = -EFAULT;
 289                 goto free_sgt;
 290         }
 291
 292         return 0;
 293
 294 free_sgt:
 295         sg_free_table(bo->sgt);
 296         kfree(bo->sgt);
 297 put_pages:
 298         drm_gem_put_pages(&bo->gem, bo->pages, false, false);
 299         return err;
 300 }
 301
 302 static int tegra_bo_alloc(struct drm_device *drm, struct tegra_bo *bo)
 303 {
 304         struct tegra_drm *tegra = drm->dev_private;
 305         int err;
 306
 307         if (tegra->domain) {
 308                 err = tegra_bo_get_pages(drm, bo);
 309                 if (err < 0)
 310                         return err;
 311
 312                 err = tegra_bo_iommu_map(tegra, bo);
 313                 if (err < 0) {
 314                         tegra_bo_free(drm, bo);
 315                         return err;
 316                 }
 317         } else {
 318                 size_t size = bo->gem.size;
 319
 320                 bo->vaddr = dma_alloc_wc(drm->dev, size, &bo->iova,
 321                                          GFP_KERNEL | __GFP_NOWARN);
 322                 if (!bo->vaddr) {
 323                         dev_err(drm->dev,
 324                                 "failed to allocate buffer of size %zu\n",
 325                                 size);
 326                         return -ENOMEM;
 327                 }
 328         }
 329
 330         return 0;
 331 }
 332
 333 struct tegra_bo *tegra_bo_create(struct drm_device *drm, size_t size,
 334                                  unsigned long flags)
 335 {
 336         struct tegra_bo *bo;
 337         int err;
 338
 339         bo = tegra_bo_alloc_object(drm, size);
 340         if (IS_ERR(bo))
 341                 return bo;
 342
 343         err = tegra_bo_alloc(drm, bo);
 344         if (err < 0)
 345                 goto release;
 346
 347         if (flags & DRM_TEGRA_GEM_CREATE_TILED)
 348                 bo->tiling.mode = TEGRA_BO_TILING_MODE_TILED;
 349
 350         if (flags & DRM_TEGRA_GEM_CREATE_BOTTOM_UP)
 351                 bo->flags |= TEGRA_BO_BOTTOM_UP;
 352
 353         return bo;
 354
 355 release:
 356         drm_gem_object_release(&bo->gem);
 357         kfree(bo);
 358         return ERR_PTR(err);
 359 }
 360
 361 struct tegra_bo *tegra_bo_create_with_handle(struct drm_file *file,
 362                                              struct drm_device *drm,
 363                                              size_t size,
 364                                              unsigned long flags,
 365                                              u32 *handle)
 366 {
 367         struct tegra_bo *bo;
 368         int err;
 369
 370         bo = tegra_bo_create(drm, size, flags);
 371         if (IS_ERR(bo))
 372                 return bo;
 373
 374         err = drm_gem_handle_create(file, &bo->gem, handle);
 375         if (err) {
 376                 tegra_bo_free_object(&bo->gem);
 377                 return ERR_PTR(err);
 378         }
 379
 380         drm_gem_object_put_unlocked(&bo->gem);
 381
 382         return bo;
 383 }
 384
 385 static struct tegra_bo *tegra_bo_import(struct drm_device *drm,
 386                                         struct dma_buf *buf)
 387 {
 388         struct tegra_drm *tegra = drm->dev_private;
 389         struct dma_buf_attachment *attach;
 390         struct tegra_bo *bo;
 391         int err;
 392
 393         bo = tegra_bo_alloc_object(drm, buf->size);
 394         if (IS_ERR(bo))
 395                 return bo;
 396
 397         attach = dma_buf_attach(buf, drm->dev);
 398         if (IS_ERR(attach)) {
 399                 err = PTR_ERR(attach);
 400                 goto free;
 401         }
 402
 403         get_dma_buf(buf);
 404
 405         bo->sgt = dma_buf_map_attachment(attach, DMA_TO_DEVICE);
 406         if (IS_ERR(bo->sgt)) {
 407                 err = PTR_ERR(bo->sgt);
 408                 goto detach;
 409         }
 410
 411         if (tegra->domain) {
 412                 err = tegra_bo_iommu_map(tegra, bo);
 413                 if (err < 0)
 414                         goto detach;
 415         }
 416
 417         bo->gem.import_attach = attach;
 418
 419         return bo;
 420
 421 detach:
 422         if (!IS_ERR_OR_NULL(bo->sgt))
 423                 dma_buf_unmap_attachment(attach, bo->sgt, DMA_TO_DEVICE);
 424
 425         dma_buf_detach(buf, attach);
 426         dma_buf_put(buf);
 427 free:
 428         drm_gem_object_release(&bo->gem);
 429         kfree(bo);
 430         return ERR_PTR(err);
 431 }
 432
 433 void tegra_bo_free_object(struct drm_gem_object *gem)
 434 {
 435         struct tegra_drm *tegra = gem->dev->dev_private;
 436         struct tegra_bo *bo = to_tegra_bo(gem);
 437
 438         if (tegra->domain)
 439                 tegra_bo_iommu_unmap(tegra, bo);
 440
 441         if (gem->import_attach) {
 442                 dma_buf_unmap_attachment(gem->import_attach, bo->sgt,
 443                                          DMA_TO_DEVICE);
 444                 drm_prime_gem_destroy(gem, NULL);
 445         } else {
 446                 tegra_bo_free(gem->dev, bo);
 447         }
 448
 449         drm_gem_object_release(gem);
 450         kfree(bo);
 451 }
 452
 453 int tegra_bo_dumb_create(struct drm_file *file, struct drm_device *drm,
 454                          struct drm_mode_create_dumb *args)
 455 {
 456         unsigned int min_pitch = DIV_ROUND_UP(args->width * args->bpp, 8);
 457         struct tegra_drm *tegra = drm->dev_private;
 458         struct tegra_bo *bo;
 459
 460         args->pitch = round_up(min_pitch, tegra->pitch_align);
 461         args->size = args->pitch * args->height;
 462
 463         bo = tegra_bo_create_with_handle(file, drm, args->size, 0,
 464                                          &args->handle);
 465         if (IS_ERR(bo))
 466                 return PTR_ERR(bo);
 467
 468         return 0;
 469 }
 470
 471 static vm_fault_t tegra_bo_fault(struct vm_fault *vmf)
 472 {
 473         struct vm_area_struct *vma = vmf->vma;
 474         struct drm_gem_object *gem = vma->vm_private_data;
 475         struct tegra_bo *bo = to_tegra_bo(gem);
 476         struct page *page;
 477         pgoff_t offset;
 478
 479         if (!bo->pages)
 480                 return VM_FAULT_SIGBUS;
 481
 482         offset = (vmf->address - vma->vm_start) >> PAGE_SHIFT;
 483         page = bo->pages[offset];
 484
 485         return vmf_insert_page(vma, vmf->address, page);
 486 }
 487
 488 const struct vm_operations_struct tegra_bo_vm_ops = {
 489         .fault = tegra_bo_fault,
 490         .open = drm_gem_vm_open,
 491         .close = drm_gem_vm_close,
 492 };
 493
 494 int __tegra_gem_mmap(struct drm_gem_object *gem, struct vm_area_struct *vma)
 495 {
 496         struct tegra_bo *bo = to_tegra_bo(gem);
 497
 498         if (!bo->pages) {
 499                 unsigned long vm_pgoff = vma->vm_pgoff;
 500                 int err;
 501
 502                 /*
 503                  * Clear the VM_PFNMAP flag that was set by drm_gem_mmap(),
 504                  * and set the vm_pgoff (used as a fake buffer offset by DRM)
 505                  * to 0 as we want to map the whole buffer.
 506                  */
 507                 vma->vm_flags &= ~VM_PFNMAP;
 508                 vma->vm_pgoff = 0;
 509
 510                 err = dma_mmap_wc(gem->dev->dev, vma, bo->vaddr, bo->iova,
 511                                   gem->size);
 512                 if (err < 0) {
 513                         drm_gem_vm_close(vma);
 514                         return err;
 515                 }
 516
 517                 vma->vm_pgoff = vm_pgoff;
 518         } else {
 519                 pgprot_t prot = vm_get_page_prot(vma->vm_flags);
 520
 521                 vma->vm_flags |= VM_MIXEDMAP;
 522                 vma->vm_flags &= ~VM_PFNMAP;
 523
 524                 vma->vm_page_prot = pgprot_writecombine(prot);
 525         }
 526
 527         return 0;
 528 }
 529
 530 int tegra_drm_mmap(struct file *file, struct vm_area_struct *vma)
 531 {
 532         struct drm_gem_object *gem;
 533         int err;
 534
 535         err = drm_gem_mmap(file, vma);
 536         if (err < 0)
 537                 return err;
 538
 539         gem = vma->vm_private_data;
 540
 541         return __tegra_gem_mmap(gem, vma);
 542 }
 543
 544 static struct sg_table *
 545 tegra_gem_prime_map_dma_buf(struct dma_buf_attachment *attach,
 546                             enum dma_data_direction dir)
 547 {
 548         struct drm_gem_object *gem = attach->dmabuf->priv;
 549         struct tegra_bo *bo = to_tegra_bo(gem);
 550         struct sg_table *sgt;
 551
 552         sgt = kmalloc(sizeof(*sgt), GFP_KERNEL);
 553         if (!sgt)
 554                 return NULL;
 555
 556         if (bo->pages) {
 557                 if (sg_alloc_table_from_pages(sgt, bo->pages, bo->num_pages,
 558                                               0, gem->size, GFP_KERNEL) < 0)
 559                         goto free;
 560         } else {
 561                 if (dma_get_sgtable(attach->dev, sgt, bo->vaddr, bo->iova,
 562                                     gem->size) < 0)
 563                         goto free;
 564         }
 565
 566         if (dma_map_sg(attach->dev, sgt->sgl, sgt->nents, dir) == 0)
 567                 goto free;
 568
 569         return sgt;
 570
 571 free:
 572         sg_free_table(sgt);
 573         kfree(sgt);
 574         return NULL;
 575 }
 576
 577 static void tegra_gem_prime_unmap_dma_buf(struct dma_buf_attachment *attach,
 578                                           struct sg_table *sgt,
 579                                           enum dma_data_direction dir)
 580 {
 581         struct drm_gem_object *gem = attach->dmabuf->priv;
 582         struct tegra_bo *bo = to_tegra_bo(gem);
 583
 584         if (bo->pages)
 585                 dma_unmap_sg(attach->dev, sgt->sgl, sgt->nents, dir);
 586
 587         sg_free_table(sgt);
 588         kfree(sgt);
 589 }
 590
 591 static void tegra_gem_prime_release(struct dma_buf *buf)
 592 {
 593         drm_gem_dmabuf_release(buf);
 594 }
 595
 596 static int tegra_gem_prime_begin_cpu_access(struct dma_buf *buf,
 597                                             enum dma_data_direction direction)
 598 {
 599         struct drm_gem_object *gem = buf->priv;
 600         struct tegra_bo *bo = to_tegra_bo(gem);
 601         struct drm_device *drm = gem->dev;
 602
 603         if (bo->pages)
 604                 dma_sync_sg_for_cpu(drm->dev, bo->sgt->sgl, bo->sgt->nents,
 605                                     DMA_FROM_DEVICE);
 606
 607         return 0;
 608 }
 609
 610 static int tegra_gem_prime_end_cpu_access(struct dma_buf *buf,
 611                                           enum dma_data_direction direction)
 612 {
 613         struct drm_gem_object *gem = buf->priv;
 614         struct tegra_bo *bo = to_tegra_bo(gem);
 615         struct drm_device *drm = gem->dev;
 616
 617         if (bo->pages)
 618                 dma_sync_sg_for_device(drm->dev, bo->sgt->sgl, bo->sgt->nents,
 619                                        DMA_TO_DEVICE);
 620
 621         return 0;
 622 }
 623
 624 static int tegra_gem_prime_mmap(struct dma_buf *buf, struct vm_area_struct *vma)
 625 {
 626         struct drm_gem_object *gem = buf->priv;
 627         int err;
 628
 629         err = drm_gem_mmap_obj(gem, gem->size, vma);
 630         if (err < 0)
 631                 return err;
 632
 633         return __tegra_gem_mmap(gem, vma);
 634 }
 635
 636 static void *tegra_gem_prime_vmap(struct dma_buf *buf)
 637 {
 638         struct drm_gem_object *gem = buf->priv;
 639         struct tegra_bo *bo = to_tegra_bo(gem);
 640
 641         return bo->vaddr;
 642 }
 643
 644 static void tegra_gem_prime_vunmap(struct dma_buf *buf, void *vaddr)
 645 {
 646 }
 647
 648 static const struct dma_buf_ops tegra_gem_prime_dmabuf_ops = {
 649         .map_dma_buf = tegra_gem_prime_map_dma_buf,
 650         .unmap_dma_buf = tegra_gem_prime_unmap_dma_buf,
 651         .release = tegra_gem_prime_release,
 652         .begin_cpu_access = tegra_gem_prime_begin_cpu_access,
 653         .end_cpu_access = tegra_gem_prime_end_cpu_access,
 654         .mmap = tegra_gem_prime_mmap,
 655         .vmap = tegra_gem_prime_vmap,
 656         .vunmap = tegra_gem_prime_vunmap,
 657 };
 658
 659 struct dma_buf *tegra_gem_prime_export(struct drm_gem_object *gem,
 660                                        int flags)
 661 {
 662         DEFINE_DMA_BUF_EXPORT_INFO(exp_info);
 663
 664         exp_info.exp_name = KBUILD_MODNAME;
 665         exp_info.owner = gem->dev->driver->fops->owner;
 666         exp_info.ops = &tegra_gem_prime_dmabuf_ops;
 667         exp_info.size = gem->size;
 668         exp_info.flags = flags;
 669         exp_info.priv = gem;
 670
 671         return drm_gem_dmabuf_export(gem->dev, &exp_info);
 672 }
 673
 674 struct drm_gem_object *tegra_gem_prime_import(struct drm_device *drm,
 675                                               struct dma_buf *buf)
 676 {
 677         struct tegra_bo *bo;
 678
 679         if (buf->ops == &tegra_gem_prime_dmabuf_ops) {
 680                 struct drm_gem_object *gem = buf->priv;
 681
 682                 if (gem->dev == drm) {
 683                         drm_gem_object_get(gem);
 684                         return gem;
 685                 }
 686         }
 687
 688         bo = tegra_bo_import(drm, buf);
 689         if (IS_ERR(bo))
 690                 return ERR_CAST(bo);
 691
 692         return &bo->gem;
 693 }