drivers/gpu/drm/tegra/gem.c

   1 /*
   2  * NVIDIA Tegra DRM GEM helper functions
   3  *
   4  * Copyright (C) 2012 Sascha Hauer, Pengutronix
   5  * Copyright (C) 2013-2015 NVIDIA CORPORATION, All rights reserved.
   6  *
   7  * Based on the GEM/CMA helpers
   8  *
   9  * Copyright (c) 2011 Samsung Electronics Co., Ltd.
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License version 2 as
  13  * published by the Free Software Foundation.
  14  */
  15
  16 #include <linux/dma-buf.h>
  17 #include <linux/iommu.h>
  18 #include <drm/tegra_drm.h>
  19
  20 #include "drm.h"
  21 #include "gem.h"
  22
  23 static inline struct tegra_bo *host1x_to_tegra_bo(struct host1x_bo *bo)
  24 {
  25         return container_of(bo, struct tegra_bo, base);
  26 }
  27
  28 static void tegra_bo_put(struct host1x_bo *bo)
  29 {
  30         struct tegra_bo *obj = host1x_to_tegra_bo(bo);
  31
  32         drm_gem_object_unreference_unlocked(&obj->gem);
  33 }
  34
  35 static dma_addr_t tegra_bo_pin(struct host1x_bo *bo, struct sg_table **sgt)
  36 {
  37         struct tegra_bo *obj = host1x_to_tegra_bo(bo);
  38
  39         *sgt = obj->sgt;
  40
  41         return obj->paddr;
  42 }
  43
  44 static void tegra_bo_unpin(struct host1x_bo *bo, struct sg_table *sgt)
  45 {
  46 }
  47
  48 static void *tegra_bo_mmap(struct host1x_bo *bo)
  49 {
  50         struct tegra_bo *obj = host1x_to_tegra_bo(bo);
  51
  52         if (obj->vaddr)
  53                 return obj->vaddr;
  54         else if (obj->gem.import_attach)
  55                 return dma_buf_vmap(obj->gem.import_attach->dmabuf);
  56         else
  57                 return vmap(obj->pages, obj->num_pages, VM_MAP,
  58                             pgprot_writecombine(PAGE_KERNEL));
  59 }
  60
  61 static void tegra_bo_munmap(struct host1x_bo *bo, void *addr)
  62 {
  63         struct tegra_bo *obj = host1x_to_tegra_bo(bo);
  64
  65         if (obj->vaddr)
  66                 return;
  67         else if (obj->gem.import_attach)
  68                 dma_buf_vunmap(obj->gem.import_attach->dmabuf, addr);
  69         else
  70                 vunmap(addr);
  71 }
  72
  73 static void *tegra_bo_kmap(struct host1x_bo *bo, unsigned int page)
  74 {
  75         struct tegra_bo *obj = host1x_to_tegra_bo(bo);
  76
  77         if (obj->vaddr)
  78                 return obj->vaddr + page * PAGE_SIZE;
  79         else if (obj->gem.import_attach)
  80                 return dma_buf_kmap(obj->gem.import_attach->dmabuf, page);
  81         else
  82                 return vmap(obj->pages + page, 1, VM_MAP,
  83                             pgprot_writecombine(PAGE_KERNEL));
  84 }
  85
  86 static void tegra_bo_kunmap(struct host1x_bo *bo, unsigned int page,
  87                             void *addr)
  88 {
  89         struct tegra_bo *obj = host1x_to_tegra_bo(bo);
  90
  91         if (obj->vaddr)
  92                 return;
  93         else if (obj->gem.import_attach)
  94                 dma_buf_kunmap(obj->gem.import_attach->dmabuf, page, addr);
  95         else
  96                 vunmap(addr);
  97 }
  98
  99 static struct host1x_bo *tegra_bo_get(struct host1x_bo *bo)
 100 {
 101         struct tegra_bo *obj = host1x_to_tegra_bo(bo);
 102
 103         drm_gem_object_reference(&obj->gem);
 104
 105         return bo;
 106 }
 107
 108 static const struct host1x_bo_ops tegra_bo_ops = {
 109         .get = tegra_bo_get,
 110         .put = tegra_bo_put,
 111         .pin = tegra_bo_pin,
 112         .unpin = tegra_bo_unpin,
 113         .mmap = tegra_bo_mmap,
 114         .munmap = tegra_bo_munmap,
 115         .kmap = tegra_bo_kmap,
 116         .kunmap = tegra_bo_kunmap,
 117 };
 118
 119 static int tegra_bo_iommu_map(struct tegra_drm *tegra, struct tegra_bo *bo)
 120 {
 121         int prot = IOMMU_READ | IOMMU_WRITE;
 122         ssize_t err;
 123
 124         if (bo->mm)
 125                 return -EBUSY;
 126
 127         bo->mm = kzalloc(sizeof(*bo->mm), GFP_KERNEL);
 128         if (!bo->mm)
 129                 return -ENOMEM;
 130
 131         err = drm_mm_insert_node_generic(&tegra->mm, bo->mm, bo->gem.size,
 132                                          PAGE_SIZE, 0, 0, 0);
 133         if (err < 0) {
 134                 dev_err(tegra->drm->dev, "out of I/O virtual memory: %zd\n",
 135                         err);
 136                 goto free;
 137         }
 138
 139         bo->paddr = bo->mm->start;
 140
 141         err = iommu_map_sg(tegra->domain, bo->paddr, bo->sgt->sgl,
 142                            bo->sgt->nents, prot);
 143         if (err < 0) {
 144                 dev_err(tegra->drm->dev, "failed to map buffer: %zd\n", err);
 145                 goto remove;
 146         }
 147
 148         bo->size = err;
 149
 150         return 0;
 151
 152 remove:
 153         drm_mm_remove_node(bo->mm);
 154 free:
 155         kfree(bo->mm);
 156         return err;
 157 }
 158
 159 static int tegra_bo_iommu_unmap(struct tegra_drm *tegra, struct tegra_bo *bo)
 160 {
 161         if (!bo->mm)
 162                 return 0;
 163
 164         iommu_unmap(tegra->domain, bo->paddr, bo->size);
 165         drm_mm_remove_node(bo->mm);
 166         kfree(bo->mm);
 167
 168         return 0;
 169 }
 170
 171 static struct tegra_bo *tegra_bo_alloc_object(struct drm_device *drm,
 172                                               size_t size)
 173 {
 174         struct tegra_bo *bo;
 175         int err;
 176
 177         bo = kzalloc(sizeof(*bo), GFP_KERNEL);
 178         if (!bo)
 179                 return ERR_PTR(-ENOMEM);
 180
 181         host1x_bo_init(&bo->base, &tegra_bo_ops);
 182         size = round_up(size, PAGE_SIZE);
 183
 184         err = drm_gem_object_init(drm, &bo->gem, size);
 185         if (err < 0)
 186                 goto free;
 187
 188         err = drm_gem_create_mmap_offset(&bo->gem);
 189         if (err < 0)
 190                 goto release;
 191
 192         return bo;
 193
 194 release:
 195         drm_gem_object_release(&bo->gem);
 196 free:
 197         kfree(bo);
 198         return ERR_PTR(err);
 199 }
 200
 201 static void tegra_bo_free(struct drm_device *drm, struct tegra_bo *bo)
 202 {
 203         if (bo->pages) {
 204                 drm_gem_put_pages(&bo->gem, bo->pages, true, true);
 205                 sg_free_table(bo->sgt);
 206                 kfree(bo->sgt);
 207         } else if (bo->vaddr) {
 208                 dma_free_wc(drm->dev, bo->gem.size, bo->vaddr, bo->paddr);
 209         }
 210 }
 211
 212 static int tegra_bo_get_pages(struct drm_device *drm, struct tegra_bo *bo)
 213 {
 214         struct scatterlist *s;
 215         unsigned int i;
 216
 217         bo->pages = drm_gem_get_pages(&bo->gem);
 218         if (IS_ERR(bo->pages))
 219                 return PTR_ERR(bo->pages);
 220
 221         bo->num_pages = bo->gem.size >> PAGE_SHIFT;
 222
 223         bo->sgt = drm_prime_pages_to_sg(bo->pages, bo->num_pages);
 224         if (IS_ERR(bo->sgt))
 225                 goto put_pages;
 226
 227         /*
 228          * Fake up the SG table so that dma_sync_sg_for_device() can be used
 229          * to flush the pages associated with it.
 230          *
 231          * TODO: Replace this by drm_clflash_sg() once it can be implemented
 232          * without relying on symbols that are not exported.
 233          */
 234         for_each_sg(bo->sgt->sgl, s, bo->sgt->nents, i)
 235                 sg_dma_address(s) = sg_phys(s);
 236
 237         dma_sync_sg_for_device(drm->dev, bo->sgt->sgl, bo->sgt->nents,
 238                                DMA_TO_DEVICE);
 239
 240         return 0;
 241
 242 put_pages:
 243         drm_gem_put_pages(&bo->gem, bo->pages, false, false);
 244         return PTR_ERR(bo->sgt);
 245 }
 246
 247 static int tegra_bo_alloc(struct drm_device *drm, struct tegra_bo *bo)
 248 {
 249         struct tegra_drm *tegra = drm->dev_private;
 250         int err;
 251
 252         if (tegra->domain) {
 253                 err = tegra_bo_get_pages(drm, bo);
 254                 if (err < 0)
 255                         return err;
 256
 257                 err = tegra_bo_iommu_map(tegra, bo);
 258                 if (err < 0) {
 259                         tegra_bo_free(drm, bo);
 260                         return err;
 261                 }
 262         } else {
 263                 size_t size = bo->gem.size;
 264
 265                 bo->vaddr = dma_alloc_wc(drm->dev, size, &bo->paddr,
 266                                          GFP_KERNEL | __GFP_NOWARN);
 267                 if (!bo->vaddr) {
 268                         dev_err(drm->dev,
 269                                 "failed to allocate buffer of size %zu\n",
 270                                 size);
 271                         return -ENOMEM;
 272                 }
 273         }
 274
 275         return 0;
 276 }
 277
 278 struct tegra_bo *tegra_bo_create(struct drm_device *drm, size_t size,
 279                                  unsigned long flags)
 280 {
 281         struct tegra_bo *bo;
 282         int err;
 283
 284         bo = tegra_bo_alloc_object(drm, size);
 285         if (IS_ERR(bo))
 286                 return bo;
 287
 288         err = tegra_bo_alloc(drm, bo);
 289         if (err < 0)
 290                 goto release;
 291
 292         if (flags & DRM_TEGRA_GEM_CREATE_TILED)
 293                 bo->tiling.mode = TEGRA_BO_TILING_MODE_TILED;
 294
 295         if (flags & DRM_TEGRA_GEM_CREATE_BOTTOM_UP)
 296                 bo->flags |= TEGRA_BO_BOTTOM_UP;
 297
 298         return bo;
 299
 300 release:
 301         drm_gem_object_release(&bo->gem);
 302         kfree(bo);
 303         return ERR_PTR(err);
 304 }
 305
 306 struct tegra_bo *tegra_bo_create_with_handle(struct drm_file *file,
 307                                              struct drm_device *drm,
 308                                              size_t size,
 309                                              unsigned long flags,
 310                                              u32 *handle)
 311 {
 312         struct tegra_bo *bo;
 313         int err;
 314
 315         bo = tegra_bo_create(drm, size, flags);
 316         if (IS_ERR(bo))
 317                 return bo;
 318
 319         err = drm_gem_handle_create(file, &bo->gem, handle);
 320         if (err) {
 321                 tegra_bo_free_object(&bo->gem);
 322                 return ERR_PTR(err);
 323         }
 324
 325         drm_gem_object_unreference_unlocked(&bo->gem);
 326
 327         return bo;
 328 }
 329
 330 static struct tegra_bo *tegra_bo_import(struct drm_device *drm,
 331                                         struct dma_buf *buf)
 332 {
 333         struct tegra_drm *tegra = drm->dev_private;
 334         struct dma_buf_attachment *attach;
 335         struct tegra_bo *bo;
 336         int err;
 337
 338         bo = tegra_bo_alloc_object(drm, buf->size);
 339         if (IS_ERR(bo))
 340                 return bo;
 341
 342         attach = dma_buf_attach(buf, drm->dev);
 343         if (IS_ERR(attach)) {
 344                 err = PTR_ERR(attach);
 345                 goto free;
 346         }
 347
 348         get_dma_buf(buf);
 349
 350         bo->sgt = dma_buf_map_attachment(attach, DMA_TO_DEVICE);
 351         if (IS_ERR(bo->sgt)) {
 352                 err = PTR_ERR(bo->sgt);
 353                 goto detach;
 354         }
 355
 356         if (tegra->domain) {
 357                 err = tegra_bo_iommu_map(tegra, bo);
 358                 if (err < 0)
 359                         goto detach;
 360         } else {
 361                 if (bo->sgt->nents > 1) {
 362                         err = -EINVAL;
 363                         goto detach;
 364                 }
 365
 366                 bo->paddr = sg_dma_address(bo->sgt->sgl);
 367         }
 368
 369         bo->gem.import_attach = attach;
 370
 371         return bo;
 372
 373 detach:
 374         if (!IS_ERR_OR_NULL(bo->sgt))
 375                 dma_buf_unmap_attachment(attach, bo->sgt, DMA_TO_DEVICE);
 376
 377         dma_buf_detach(buf, attach);
 378         dma_buf_put(buf);
 379 free:
 380         drm_gem_object_release(&bo->gem);
 381         kfree(bo);
 382         return ERR_PTR(err);
 383 }
 384
 385 void tegra_bo_free_object(struct drm_gem_object *gem)
 386 {
 387         struct tegra_drm *tegra = gem->dev->dev_private;
 388         struct tegra_bo *bo = to_tegra_bo(gem);
 389
 390         if (tegra->domain)
 391                 tegra_bo_iommu_unmap(tegra, bo);
 392
 393         if (gem->import_attach) {
 394                 dma_buf_unmap_attachment(gem->import_attach, bo->sgt,
 395                                          DMA_TO_DEVICE);
 396                 drm_prime_gem_destroy(gem, NULL);
 397         } else {
 398                 tegra_bo_free(gem->dev, bo);
 399         }
 400
 401         drm_gem_object_release(gem);
 402         kfree(bo);
 403 }
 404
 405 int tegra_bo_dumb_create(struct drm_file *file, struct drm_device *drm,
 406                          struct drm_mode_create_dumb *args)
 407 {
 408         unsigned int min_pitch = DIV_ROUND_UP(args->width * args->bpp, 8);
 409         struct tegra_drm *tegra = drm->dev_private;
 410         struct tegra_bo *bo;
 411
 412         args->pitch = round_up(min_pitch, tegra->pitch_align);
 413         args->size = args->pitch * args->height;
 414
 415         bo = tegra_bo_create_with_handle(file, drm, args->size, 0,
 416                                          &args->handle);
 417         if (IS_ERR(bo))
 418                 return PTR_ERR(bo);
 419
 420         return 0;
 421 }
 422
 423 int tegra_bo_dumb_map_offset(struct drm_file *file, struct drm_device *drm,
 424                              u32 handle, u64 *offset)
 425 {
 426         struct drm_gem_object *gem;
 427         struct tegra_bo *bo;
 428
 429         gem = drm_gem_object_lookup(file, handle);
 430         if (!gem) {
 431                 dev_err(drm->dev, "failed to lookup GEM object\n");
 432                 return -EINVAL;
 433         }
 434
 435         bo = to_tegra_bo(gem);
 436
 437         *offset = drm_vma_node_offset_addr(&bo->gem.vma_node);
 438
 439         drm_gem_object_unreference_unlocked(gem);
 440
 441         return 0;
 442 }
 443
 444 static int tegra_bo_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
 445 {
 446         struct drm_gem_object *gem = vma->vm_private_data;
 447         struct tegra_bo *bo = to_tegra_bo(gem);
 448         struct page *page;
 449         pgoff_t offset;
 450         int err;
 451
 452         if (!bo->pages)
 453                 return VM_FAULT_SIGBUS;
 454
 455         offset = (vmf->address - vma->vm_start) >> PAGE_SHIFT;
 456         page = bo->pages[offset];
 457
 458         err = vm_insert_page(vma, vmf->address, page);
 459         switch (err) {
 460         case -EAGAIN:
 461         case 0:
 462         case -ERESTARTSYS:
 463         case -EINTR:
 464         case -EBUSY:
 465                 return VM_FAULT_NOPAGE;
 466
 467         case -ENOMEM:
 468                 return VM_FAULT_OOM;
 469         }
 470
 471         return VM_FAULT_SIGBUS;
 472 }
 473
 474 const struct vm_operations_struct tegra_bo_vm_ops = {
 475         .fault = tegra_bo_fault,
 476         .open = drm_gem_vm_open,
 477         .close = drm_gem_vm_close,
 478 };
 479
 480 int tegra_drm_mmap(struct file *file, struct vm_area_struct *vma)
 481 {
 482         struct drm_gem_object *gem;
 483         struct tegra_bo *bo;
 484         int ret;
 485
 486         ret = drm_gem_mmap(file, vma);
 487         if (ret)
 488                 return ret;
 489
 490         gem = vma->vm_private_data;
 491         bo = to_tegra_bo(gem);
 492
 493         if (!bo->pages) {
 494                 unsigned long vm_pgoff = vma->vm_pgoff;
 495
 496                 vma->vm_flags &= ~VM_PFNMAP;
 497                 vma->vm_pgoff = 0;
 498
 499                 ret = dma_mmap_wc(gem->dev->dev, vma, bo->vaddr, bo->paddr,
 500                                   gem->size);
 501                 if (ret) {
 502                         drm_gem_vm_close(vma);
 503                         return ret;
 504                 }
 505
 506                 vma->vm_pgoff = vm_pgoff;
 507         } else {
 508                 pgprot_t prot = vm_get_page_prot(vma->vm_flags);
 509
 510                 vma->vm_flags |= VM_MIXEDMAP;
 511                 vma->vm_flags &= ~VM_PFNMAP;
 512
 513                 vma->vm_page_prot = pgprot_writecombine(prot);
 514         }
 515
 516         return 0;
 517 }
 518
 519 static struct sg_table *
 520 tegra_gem_prime_map_dma_buf(struct dma_buf_attachment *attach,
 521                             enum dma_data_direction dir)
 522 {
 523         struct drm_gem_object *gem = attach->dmabuf->priv;
 524         struct tegra_bo *bo = to_tegra_bo(gem);
 525         struct sg_table *sgt;
 526
 527         sgt = kmalloc(sizeof(*sgt), GFP_KERNEL);
 528         if (!sgt)
 529                 return NULL;
 530
 531         if (bo->pages) {
 532                 struct scatterlist *sg;
 533                 unsigned int i;
 534
 535                 if (sg_alloc_table(sgt, bo->num_pages, GFP_KERNEL))
 536                         goto free;
 537
 538                 for_each_sg(sgt->sgl, sg, bo->num_pages, i)
 539                         sg_set_page(sg, bo->pages[i], PAGE_SIZE, 0);
 540
 541                 if (dma_map_sg(attach->dev, sgt->sgl, sgt->nents, dir) == 0)
 542                         goto free;
 543         } else {
 544                 if (sg_alloc_table(sgt, 1, GFP_KERNEL))
 545                         goto free;
 546
 547                 sg_dma_address(sgt->sgl) = bo->paddr;
 548                 sg_dma_len(sgt->sgl) = gem->size;
 549         }
 550
 551         return sgt;
 552
 553 free:
 554         sg_free_table(sgt);
 555         kfree(sgt);
 556         return NULL;
 557 }
 558
 559 static void tegra_gem_prime_unmap_dma_buf(struct dma_buf_attachment *attach,
 560                                           struct sg_table *sgt,
 561                                           enum dma_data_direction dir)
 562 {
 563         struct drm_gem_object *gem = attach->dmabuf->priv;
 564         struct tegra_bo *bo = to_tegra_bo(gem);
 565
 566         if (bo->pages)
 567                 dma_unmap_sg(attach->dev, sgt->sgl, sgt->nents, dir);
 568
 569         sg_free_table(sgt);
 570         kfree(sgt);
 571 }
 572
 573 static void tegra_gem_prime_release(struct dma_buf *buf)
 574 {
 575         drm_gem_dmabuf_release(buf);
 576 }
 577
 578 static void *tegra_gem_prime_kmap_atomic(struct dma_buf *buf,
 579                                          unsigned long page)
 580 {
 581         return NULL;
 582 }
 583
 584 static void tegra_gem_prime_kunmap_atomic(struct dma_buf *buf,
 585                                           unsigned long page,
 586                                           void *addr)
 587 {
 588 }
 589
 590 static void *tegra_gem_prime_kmap(struct dma_buf *buf, unsigned long page)
 591 {
 592         return NULL;
 593 }
 594
 595 static void tegra_gem_prime_kunmap(struct dma_buf *buf, unsigned long page,
 596                                    void *addr)
 597 {
 598 }
 599
 600 static int tegra_gem_prime_mmap(struct dma_buf *buf, struct vm_area_struct *vma)
 601 {
 602         return -EINVAL;
 603 }
 604
 605 static void *tegra_gem_prime_vmap(struct dma_buf *buf)
 606 {
 607         struct drm_gem_object *gem = buf->priv;
 608         struct tegra_bo *bo = to_tegra_bo(gem);
 609
 610         return bo->vaddr;
 611 }
 612
 613 static void tegra_gem_prime_vunmap(struct dma_buf *buf, void *vaddr)
 614 {
 615 }
 616
 617 static const struct dma_buf_ops tegra_gem_prime_dmabuf_ops = {
 618         .map_dma_buf = tegra_gem_prime_map_dma_buf,
 619         .unmap_dma_buf = tegra_gem_prime_unmap_dma_buf,
 620         .release = tegra_gem_prime_release,
 621         .kmap_atomic = tegra_gem_prime_kmap_atomic,
 622         .kunmap_atomic = tegra_gem_prime_kunmap_atomic,
 623         .kmap = tegra_gem_prime_kmap,
 624         .kunmap = tegra_gem_prime_kunmap,
 625         .mmap = tegra_gem_prime_mmap,
 626         .vmap = tegra_gem_prime_vmap,
 627         .vunmap = tegra_gem_prime_vunmap,
 628 };
 629
 630 struct dma_buf *tegra_gem_prime_export(struct drm_device *drm,
 631                                        struct drm_gem_object *gem,
 632                                        int flags)
 633 {
 634         DEFINE_DMA_BUF_EXPORT_INFO(exp_info);
 635
 636         exp_info.ops = &tegra_gem_prime_dmabuf_ops;
 637         exp_info.size = gem->size;
 638         exp_info.flags = flags;
 639         exp_info.priv = gem;
 640
 641         return drm_gem_dmabuf_export(drm, &exp_info);
 642 }
 643
 644 struct drm_gem_object *tegra_gem_prime_import(struct drm_device *drm,
 645                                               struct dma_buf *buf)
 646 {
 647         struct tegra_bo *bo;
 648
 649         if (buf->ops == &tegra_gem_prime_dmabuf_ops) {
 650                 struct drm_gem_object *gem = buf->priv;
 651
 652                 if (gem->dev == drm) {
 653                         drm_gem_object_reference(gem);
 654                         return gem;
 655                 }
 656         }
 657
 658         bo = tegra_bo_import(drm, buf);
 659         if (IS_ERR(bo))
 660                 return ERR_CAST(bo);
 661
 662         return &bo->gem;
 663 }