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                 drm_gem_put_pages(&bo->gem, bo->pages, true, true);
 207                 sg_free_table(bo->sgt);
 208                 kfree(bo->sgt);
 209         } else if (bo->vaddr) {
 210                 dma_free_wc(drm->dev, bo->gem.size, bo->vaddr, bo->paddr);
 211         }
 212 }
 213
 214 static int tegra_bo_get_pages(struct drm_device *drm, struct tegra_bo *bo)
 215 {
 216         struct scatterlist *s;
 217         unsigned int i;
 218
 219         bo->pages = drm_gem_get_pages(&bo->gem);
 220         if (IS_ERR(bo->pages))
 221                 return PTR_ERR(bo->pages);
 222
 223         bo->num_pages = bo->gem.size >> PAGE_SHIFT;
 224
 225         bo->sgt = drm_prime_pages_to_sg(bo->pages, bo->num_pages);
 226         if (IS_ERR(bo->sgt))
 227                 goto put_pages;
 228
 229         /*
 230          * Fake up the SG table so that dma_sync_sg_for_device() can be used
 231          * to flush the pages associated with it.
 232          *
 233          * TODO: Replace this by drm_clflash_sg() once it can be implemented
 234          * without relying on symbols that are not exported.
 235          */
 236         for_each_sg(bo->sgt->sgl, s, bo->sgt->nents, i)
 237                 sg_dma_address(s) = sg_phys(s);
 238
 239         dma_sync_sg_for_device(drm->dev, bo->sgt->sgl, bo->sgt->nents,
 240                                DMA_TO_DEVICE);
 241
 242         return 0;
 243
 244 put_pages:
 245         drm_gem_put_pages(&bo->gem, bo->pages, false, false);
 246         return PTR_ERR(bo->sgt);
 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 int 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         int err;
 433
 434         if (!bo->pages)
 435                 return VM_FAULT_SIGBUS;
 436
 437         offset = (vmf->address - vma->vm_start) >> PAGE_SHIFT;
 438         page = bo->pages[offset];
 439
 440         err = vm_insert_page(vma, vmf->address, page);
 441         switch (err) {
 442         case -EAGAIN:
 443         case 0:
 444         case -ERESTARTSYS:
 445         case -EINTR:
 446         case -EBUSY:
 447                 return VM_FAULT_NOPAGE;
 448
 449         case -ENOMEM:
 450                 return VM_FAULT_OOM;
 451         }
 452
 453         return VM_FAULT_SIGBUS;
 454 }
 455
 456 const struct vm_operations_struct tegra_bo_vm_ops = {
 457         .fault = tegra_bo_fault,
 458         .open = drm_gem_vm_open,
 459         .close = drm_gem_vm_close,
 460 };
 461
 462 static int tegra_gem_mmap(struct drm_gem_object *gem,
 463                           struct vm_area_struct *vma)
 464 {
 465         struct tegra_bo *bo = to_tegra_bo(gem);
 466
 467         if (!bo->pages) {
 468                 unsigned long vm_pgoff = vma->vm_pgoff;
 469                 int err;
 470
 471                 /*
 472                  * Clear the VM_PFNMAP flag that was set by drm_gem_mmap(),
 473                  * and set the vm_pgoff (used as a fake buffer offset by DRM)
 474                  * to 0 as we want to map the whole buffer.
 475                  */
 476                 vma->vm_flags &= ~VM_PFNMAP;
 477                 vma->vm_pgoff = 0;
 478
 479                 err = dma_mmap_wc(gem->dev->dev, vma, bo->vaddr, bo->paddr,
 480                                   gem->size);
 481                 if (err < 0) {
 482                         drm_gem_vm_close(vma);
 483                         return err;
 484                 }
 485
 486                 vma->vm_pgoff = vm_pgoff;
 487         } else {
 488                 pgprot_t prot = vm_get_page_prot(vma->vm_flags);
 489
 490                 vma->vm_flags |= VM_MIXEDMAP;
 491                 vma->vm_flags &= ~VM_PFNMAP;
 492
 493                 vma->vm_page_prot = pgprot_writecombine(prot);
 494         }
 495
 496         return 0;
 497 }
 498
 499 int tegra_drm_mmap(struct file *file, struct vm_area_struct *vma)
 500 {
 501         struct drm_gem_object *gem;
 502         int err;
 503
 504         err = drm_gem_mmap(file, vma);
 505         if (err < 0)
 506                 return err;
 507
 508         gem = vma->vm_private_data;
 509
 510         return tegra_gem_mmap(gem, vma);
 511 }
 512
 513 static struct sg_table *
 514 tegra_gem_prime_map_dma_buf(struct dma_buf_attachment *attach,
 515                             enum dma_data_direction dir)
 516 {
 517         struct drm_gem_object *gem = attach->dmabuf->priv;
 518         struct tegra_bo *bo = to_tegra_bo(gem);
 519         struct sg_table *sgt;
 520
 521         sgt = kmalloc(sizeof(*sgt), GFP_KERNEL);
 522         if (!sgt)
 523                 return NULL;
 524
 525         if (bo->pages) {
 526                 struct scatterlist *sg;
 527                 unsigned int i;
 528
 529                 if (sg_alloc_table(sgt, bo->num_pages, GFP_KERNEL))
 530                         goto free;
 531
 532                 for_each_sg(sgt->sgl, sg, bo->num_pages, i)
 533                         sg_set_page(sg, bo->pages[i], PAGE_SIZE, 0);
 534
 535                 if (dma_map_sg(attach->dev, sgt->sgl, sgt->nents, dir) == 0)
 536                         goto free;
 537         } else {
 538                 if (sg_alloc_table(sgt, 1, GFP_KERNEL))
 539                         goto free;
 540
 541                 sg_dma_address(sgt->sgl) = bo->paddr;
 542                 sg_dma_len(sgt->sgl) = gem->size;
 543         }
 544
 545         return sgt;
 546
 547 free:
 548         sg_free_table(sgt);
 549         kfree(sgt);
 550         return NULL;
 551 }
 552
 553 static void tegra_gem_prime_unmap_dma_buf(struct dma_buf_attachment *attach,
 554                                           struct sg_table *sgt,
 555                                           enum dma_data_direction dir)
 556 {
 557         struct drm_gem_object *gem = attach->dmabuf->priv;
 558         struct tegra_bo *bo = to_tegra_bo(gem);
 559
 560         if (bo->pages)
 561                 dma_unmap_sg(attach->dev, sgt->sgl, sgt->nents, dir);
 562
 563         sg_free_table(sgt);
 564         kfree(sgt);
 565 }
 566
 567 static void tegra_gem_prime_release(struct dma_buf *buf)
 568 {
 569         drm_gem_dmabuf_release(buf);
 570 }
 571
 572 static void *tegra_gem_prime_kmap_atomic(struct dma_buf *buf,
 573                                          unsigned long page)
 574 {
 575         return NULL;
 576 }
 577
 578 static void tegra_gem_prime_kunmap_atomic(struct dma_buf *buf,
 579                                           unsigned long page,
 580                                           void *addr)
 581 {
 582 }
 583
 584 static void *tegra_gem_prime_kmap(struct dma_buf *buf, unsigned long page)
 585 {
 586         return NULL;
 587 }
 588
 589 static void tegra_gem_prime_kunmap(struct dma_buf *buf, unsigned long page,
 590                                    void *addr)
 591 {
 592 }
 593
 594 static int tegra_gem_prime_mmap(struct dma_buf *buf, struct vm_area_struct *vma)
 595 {
 596         struct drm_gem_object *gem = buf->priv;
 597         int err;
 598
 599         err = drm_gem_mmap_obj(gem, gem->size, vma);
 600         if (err < 0)
 601                 return err;
 602
 603         return tegra_gem_mmap(gem, vma);
 604 }
 605
 606 static void *tegra_gem_prime_vmap(struct dma_buf *buf)
 607 {
 608         struct drm_gem_object *gem = buf->priv;
 609         struct tegra_bo *bo = to_tegra_bo(gem);
 610
 611         return bo->vaddr;
 612 }
 613
 614 static void tegra_gem_prime_vunmap(struct dma_buf *buf, void *vaddr)
 615 {
 616 }
 617
 618 static const struct dma_buf_ops tegra_gem_prime_dmabuf_ops = {
 619         .map_dma_buf = tegra_gem_prime_map_dma_buf,
 620         .unmap_dma_buf = tegra_gem_prime_unmap_dma_buf,
 621         .release = tegra_gem_prime_release,
 622         .map_atomic = tegra_gem_prime_kmap_atomic,
 623         .unmap_atomic = tegra_gem_prime_kunmap_atomic,
 624         .map = tegra_gem_prime_kmap,
 625         .unmap = tegra_gem_prime_kunmap,
 626         .mmap = tegra_gem_prime_mmap,
 627         .vmap = tegra_gem_prime_vmap,
 628         .vunmap = tegra_gem_prime_vunmap,
 629 };
 630
 631 struct dma_buf *tegra_gem_prime_export(struct drm_device *drm,
 632                                        struct drm_gem_object *gem,
 633                                        int flags)
 634 {
 635         DEFINE_DMA_BUF_EXPORT_INFO(exp_info);
 636
 637         exp_info.ops = &tegra_gem_prime_dmabuf_ops;
 638         exp_info.size = gem->size;
 639         exp_info.flags = flags;
 640         exp_info.priv = gem;
 641
 642         return drm_gem_dmabuf_export(drm, &exp_info);
 643 }
 644
 645 struct drm_gem_object *tegra_gem_prime_import(struct drm_device *drm,
 646                                               struct dma_buf *buf)
 647 {
 648         struct tegra_bo *bo;
 649
 650         if (buf->ops == &tegra_gem_prime_dmabuf_ops) {
 651                 struct drm_gem_object *gem = buf->priv;
 652
 653                 if (gem->dev == drm) {
 654                         drm_gem_object_get(gem);
 655                         return gem;
 656                 }
 657         }
 658
 659         bo = tegra_bo_import(drm, buf);
 660         if (IS_ERR(bo))
 661                 return ERR_CAST(bo);
 662
 663         return &bo->gem;
 664 }