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