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_unreference_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_reference(&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         ssize_t 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: %zd\n",
 132                         err);
 133                 goto unlock;
 134         }
 135
 136         bo->paddr = bo->mm->start;
 137
 138         err = iommu_map_sg(tegra->domain, bo->paddr, bo->sgt->sgl,
 139                            bo->sgt->nents, prot);
 140         if (err < 0) {
 141                 dev_err(tegra->drm->dev, "failed to map buffer: %zd\n", err);
 142                 goto remove;
 143         }
 144
 145         bo->size = err;
 146
 147         mutex_unlock(&tegra->mm_lock);
 148
 149         return 0;
 150
 151 remove:
 152         drm_mm_remove_node(bo->mm);
 153 unlock:
 154         mutex_unlock(&tegra->mm_lock);
 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         mutex_lock(&tegra->mm_lock);
 165         iommu_unmap(tegra->domain, bo->paddr, bo->size);
 166         drm_mm_remove_node(bo->mm);
 167         mutex_unlock(&tegra->mm_lock);
 168
 169         kfree(bo->mm);
 170
 171         return 0;
 172 }
 173
 174 static struct tegra_bo *tegra_bo_alloc_object(struct drm_device *drm,
 175                                               size_t size)
 176 {
 177         struct tegra_bo *bo;
 178         int err;
 179
 180         bo = kzalloc(sizeof(*bo), GFP_KERNEL);
 181         if (!bo)
 182                 return ERR_PTR(-ENOMEM);
 183
 184         host1x_bo_init(&bo->base, &tegra_bo_ops);
 185         size = round_up(size, PAGE_SIZE);
 186
 187         err = drm_gem_object_init(drm, &bo->gem, size);
 188         if (err < 0)
 189                 goto free;
 190
 191         err = drm_gem_create_mmap_offset(&bo->gem);
 192         if (err < 0)
 193                 goto release;
 194
 195         return bo;
 196
 197 release:
 198         drm_gem_object_release(&bo->gem);
 199 free:
 200         kfree(bo);
 201         return ERR_PTR(err);
 202 }
 203
 204 static void tegra_bo_free(struct drm_device *drm, struct tegra_bo *bo)
 205 {
 206         if (bo->pages) {
 207                 drm_gem_put_pages(&bo->gem, bo->pages, true, true);
 208                 sg_free_table(bo->sgt);
 209                 kfree(bo->sgt);
 210         } else if (bo->vaddr) {
 211                 dma_free_wc(drm->dev, bo->gem.size, bo->vaddr, bo->paddr);
 212         }
 213 }
 214
 215 static int tegra_bo_get_pages(struct drm_device *drm, struct tegra_bo *bo)
 216 {
 217         struct scatterlist *s;
 218         unsigned int i;
 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                 goto put_pages;
 229
 230         /*
 231          * Fake up the SG table so that dma_sync_sg_for_device() can be used
 232          * to flush the pages associated with it.
 233          *
 234          * TODO: Replace this by drm_clflash_sg() once it can be implemented
 235          * without relying on symbols that are not exported.
 236          */
 237         for_each_sg(bo->sgt->sgl, s, bo->sgt->nents, i)
 238                 sg_dma_address(s) = sg_phys(s);
 239
 240         dma_sync_sg_for_device(drm->dev, bo->sgt->sgl, bo->sgt->nents,
 241                                DMA_TO_DEVICE);
 242
 243         return 0;
 244
 245 put_pages:
 246         drm_gem_put_pages(&bo->gem, bo->pages, false, false);
 247         return PTR_ERR(bo->sgt);
 248 }
 249
 250 static int tegra_bo_alloc(struct drm_device *drm, struct tegra_bo *bo)
 251 {
 252         struct tegra_drm *tegra = drm->dev_private;
 253         int err;
 254
 255         if (tegra->domain) {
 256                 err = tegra_bo_get_pages(drm, bo);
 257                 if (err < 0)
 258                         return err;
 259
 260                 err = tegra_bo_iommu_map(tegra, bo);
 261                 if (err < 0) {
 262                         tegra_bo_free(drm, bo);
 263                         return err;
 264                 }
 265         } else {
 266                 size_t size = bo->gem.size;
 267
 268                 bo->vaddr = dma_alloc_wc(drm->dev, size, &bo->paddr,
 269                                          GFP_KERNEL | __GFP_NOWARN);
 270                 if (!bo->vaddr) {
 271                         dev_err(drm->dev,
 272                                 "failed to allocate buffer of size %zu\n",
 273                                 size);
 274                         return -ENOMEM;
 275                 }
 276         }
 277
 278         return 0;
 279 }
 280
 281 struct tegra_bo *tegra_bo_create(struct drm_device *drm, size_t size,
 282                                  unsigned long flags)
 283 {
 284         struct tegra_bo *bo;
 285         int err;
 286
 287         bo = tegra_bo_alloc_object(drm, size);
 288         if (IS_ERR(bo))
 289                 return bo;
 290
 291         err = tegra_bo_alloc(drm, bo);
 292         if (err < 0)
 293                 goto release;
 294
 295         if (flags & DRM_TEGRA_GEM_CREATE_TILED)
 296                 bo->tiling.mode = TEGRA_BO_TILING_MODE_TILED;
 297
 298         if (flags & DRM_TEGRA_GEM_CREATE_BOTTOM_UP)
 299                 bo->flags |= TEGRA_BO_BOTTOM_UP;
 300
 301         return bo;
 302
 303 release:
 304         drm_gem_object_release(&bo->gem);
 305         kfree(bo);
 306         return ERR_PTR(err);
 307 }
 308
 309 struct tegra_bo *tegra_bo_create_with_handle(struct drm_file *file,
 310                                              struct drm_device *drm,
 311                                              size_t size,
 312                                              unsigned long flags,
 313                                              u32 *handle)
 314 {
 315         struct tegra_bo *bo;
 316         int err;
 317
 318         bo = tegra_bo_create(drm, size, flags);
 319         if (IS_ERR(bo))
 320                 return bo;
 321
 322         err = drm_gem_handle_create(file, &bo->gem, handle);
 323         if (err) {
 324                 tegra_bo_free_object(&bo->gem);
 325                 return ERR_PTR(err);
 326         }
 327
 328         drm_gem_object_unreference_unlocked(&bo->gem);
 329
 330         return bo;
 331 }
 332
 333 static struct tegra_bo *tegra_bo_import(struct drm_device *drm,
 334                                         struct dma_buf *buf)
 335 {
 336         struct tegra_drm *tegra = drm->dev_private;
 337         struct dma_buf_attachment *attach;
 338         struct tegra_bo *bo;
 339         int err;
 340
 341         bo = tegra_bo_alloc_object(drm, buf->size);
 342         if (IS_ERR(bo))
 343                 return bo;
 344
 345         attach = dma_buf_attach(buf, drm->dev);
 346         if (IS_ERR(attach)) {
 347                 err = PTR_ERR(attach);
 348                 goto free;
 349         }
 350
 351         get_dma_buf(buf);
 352
 353         bo->sgt = dma_buf_map_attachment(attach, DMA_TO_DEVICE);
 354         if (IS_ERR(bo->sgt)) {
 355                 err = PTR_ERR(bo->sgt);
 356                 goto detach;
 357         }
 358
 359         if (tegra->domain) {
 360                 err = tegra_bo_iommu_map(tegra, bo);
 361                 if (err < 0)
 362                         goto detach;
 363         } else {
 364                 if (bo->sgt->nents > 1) {
 365                         err = -EINVAL;
 366                         goto detach;
 367                 }
 368
 369                 bo->paddr = sg_dma_address(bo->sgt->sgl);
 370         }
 371
 372         bo->gem.import_attach = attach;
 373
 374         return bo;
 375
 376 detach:
 377         if (!IS_ERR_OR_NULL(bo->sgt))
 378                 dma_buf_unmap_attachment(attach, bo->sgt, DMA_TO_DEVICE);
 379
 380         dma_buf_detach(buf, attach);
 381         dma_buf_put(buf);
 382 free:
 383         drm_gem_object_release(&bo->gem);
 384         kfree(bo);
 385         return ERR_PTR(err);
 386 }
 387
 388 void tegra_bo_free_object(struct drm_gem_object *gem)
 389 {
 390         struct tegra_drm *tegra = gem->dev->dev_private;
 391         struct tegra_bo *bo = to_tegra_bo(gem);
 392
 393         if (tegra->domain)
 394                 tegra_bo_iommu_unmap(tegra, bo);
 395
 396         if (gem->import_attach) {
 397                 dma_buf_unmap_attachment(gem->import_attach, bo->sgt,
 398                                          DMA_TO_DEVICE);
 399                 drm_prime_gem_destroy(gem, NULL);
 400         } else {
 401                 tegra_bo_free(gem->dev, bo);
 402         }
 403
 404         drm_gem_object_release(gem);
 405         kfree(bo);
 406 }
 407
 408 int tegra_bo_dumb_create(struct drm_file *file, struct drm_device *drm,
 409                          struct drm_mode_create_dumb *args)
 410 {
 411         unsigned int min_pitch = DIV_ROUND_UP(args->width * args->bpp, 8);
 412         struct tegra_drm *tegra = drm->dev_private;
 413         struct tegra_bo *bo;
 414
 415         args->pitch = round_up(min_pitch, tegra->pitch_align);
 416         args->size = args->pitch * args->height;
 417
 418         bo = tegra_bo_create_with_handle(file, drm, args->size, 0,
 419                                          &args->handle);
 420         if (IS_ERR(bo))
 421                 return PTR_ERR(bo);
 422
 423         return 0;
 424 }
 425
 426 int tegra_bo_dumb_map_offset(struct drm_file *file, struct drm_device *drm,
 427                              u32 handle, u64 *offset)
 428 {
 429         struct drm_gem_object *gem;
 430         struct tegra_bo *bo;
 431
 432         gem = drm_gem_object_lookup(file, handle);
 433         if (!gem) {
 434                 dev_err(drm->dev, "failed to lookup GEM object\n");
 435                 return -EINVAL;
 436         }
 437
 438         bo = to_tegra_bo(gem);
 439
 440         *offset = drm_vma_node_offset_addr(&bo->gem.vma_node);
 441
 442         drm_gem_object_unreference_unlocked(gem);
 443
 444         return 0;
 445 }
 446
 447 static int tegra_bo_fault(struct vm_fault *vmf)
 448 {
 449         struct vm_area_struct *vma = vmf->vma;
 450         struct drm_gem_object *gem = vma->vm_private_data;
 451         struct tegra_bo *bo = to_tegra_bo(gem);
 452         struct page *page;
 453         pgoff_t offset;
 454         int err;
 455
 456         if (!bo->pages)
 457                 return VM_FAULT_SIGBUS;
 458
 459         offset = (vmf->address - vma->vm_start) >> PAGE_SHIFT;
 460         page = bo->pages[offset];
 461
 462         err = vm_insert_page(vma, vmf->address, page);
 463         switch (err) {
 464         case -EAGAIN:
 465         case 0:
 466         case -ERESTARTSYS:
 467         case -EINTR:
 468         case -EBUSY:
 469                 return VM_FAULT_NOPAGE;
 470
 471         case -ENOMEM:
 472                 return VM_FAULT_OOM;
 473         }
 474
 475         return VM_FAULT_SIGBUS;
 476 }
 477
 478 const struct vm_operations_struct tegra_bo_vm_ops = {
 479         .fault = tegra_bo_fault,
 480         .open = drm_gem_vm_open,
 481         .close = drm_gem_vm_close,
 482 };
 483
 484 int tegra_drm_mmap(struct file *file, struct vm_area_struct *vma)
 485 {
 486         struct drm_gem_object *gem;
 487         struct tegra_bo *bo;
 488         int ret;
 489
 490         ret = drm_gem_mmap(file, vma);
 491         if (ret)
 492                 return ret;
 493
 494         gem = vma->vm_private_data;
 495         bo = to_tegra_bo(gem);
 496
 497         if (!bo->pages) {
 498                 unsigned long vm_pgoff = vma->vm_pgoff;
 499
 500                 vma->vm_flags &= ~VM_PFNMAP;
 501                 vma->vm_pgoff = 0;
 502
 503                 ret = dma_mmap_wc(gem->dev->dev, vma, bo->vaddr, bo->paddr,
 504                                   gem->size);
 505                 if (ret) {
 506                         drm_gem_vm_close(vma);
 507                         return ret;
 508                 }
 509
 510                 vma->vm_pgoff = vm_pgoff;
 511         } else {
 512                 pgprot_t prot = vm_get_page_prot(vma->vm_flags);
 513
 514                 vma->vm_flags |= VM_MIXEDMAP;
 515                 vma->vm_flags &= ~VM_PFNMAP;
 516
 517                 vma->vm_page_prot = pgprot_writecombine(prot);
 518         }
 519
 520         return 0;
 521 }
 522
 523 static struct sg_table *
 524 tegra_gem_prime_map_dma_buf(struct dma_buf_attachment *attach,
 525                             enum dma_data_direction dir)
 526 {
 527         struct drm_gem_object *gem = attach->dmabuf->priv;
 528         struct tegra_bo *bo = to_tegra_bo(gem);
 529         struct sg_table *sgt;
 530
 531         sgt = kmalloc(sizeof(*sgt), GFP_KERNEL);
 532         if (!sgt)
 533                 return NULL;
 534
 535         if (bo->pages) {
 536                 struct scatterlist *sg;
 537                 unsigned int i;
 538
 539                 if (sg_alloc_table(sgt, bo->num_pages, GFP_KERNEL))
 540                         goto free;
 541
 542                 for_each_sg(sgt->sgl, sg, bo->num_pages, i)
 543                         sg_set_page(sg, bo->pages[i], PAGE_SIZE, 0);
 544
 545                 if (dma_map_sg(attach->dev, sgt->sgl, sgt->nents, dir) == 0)
 546                         goto free;
 547         } else {
 548                 if (sg_alloc_table(sgt, 1, GFP_KERNEL))
 549                         goto free;
 550
 551                 sg_dma_address(sgt->sgl) = bo->paddr;
 552                 sg_dma_len(sgt->sgl) = gem->size;
 553         }
 554
 555         return sgt;
 556
 557 free:
 558         sg_free_table(sgt);
 559         kfree(sgt);
 560         return NULL;
 561 }
 562
 563 static void tegra_gem_prime_unmap_dma_buf(struct dma_buf_attachment *attach,
 564                                           struct sg_table *sgt,
 565                                           enum dma_data_direction dir)
 566 {
 567         struct drm_gem_object *gem = attach->dmabuf->priv;
 568         struct tegra_bo *bo = to_tegra_bo(gem);
 569
 570         if (bo->pages)
 571                 dma_unmap_sg(attach->dev, sgt->sgl, sgt->nents, dir);
 572
 573         sg_free_table(sgt);
 574         kfree(sgt);
 575 }
 576
 577 static void tegra_gem_prime_release(struct dma_buf *buf)
 578 {
 579         drm_gem_dmabuf_release(buf);
 580 }
 581
 582 static void *tegra_gem_prime_kmap_atomic(struct dma_buf *buf,
 583                                          unsigned long page)
 584 {
 585         return NULL;
 586 }
 587
 588 static void tegra_gem_prime_kunmap_atomic(struct dma_buf *buf,
 589                                           unsigned long page,
 590                                           void *addr)
 591 {
 592 }
 593
 594 static void *tegra_gem_prime_kmap(struct dma_buf *buf, unsigned long page)
 595 {
 596         return NULL;
 597 }
 598
 599 static void tegra_gem_prime_kunmap(struct dma_buf *buf, unsigned long page,
 600                                    void *addr)
 601 {
 602 }
 603
 604 static int tegra_gem_prime_mmap(struct dma_buf *buf, struct vm_area_struct *vma)
 605 {
 606         return -EINVAL;
 607 }
 608
 609 static void *tegra_gem_prime_vmap(struct dma_buf *buf)
 610 {
 611         struct drm_gem_object *gem = buf->priv;
 612         struct tegra_bo *bo = to_tegra_bo(gem);
 613
 614         return bo->vaddr;
 615 }
 616
 617 static void tegra_gem_prime_vunmap(struct dma_buf *buf, void *vaddr)
 618 {
 619 }
 620
 621 static const struct dma_buf_ops tegra_gem_prime_dmabuf_ops = {
 622         .map_dma_buf = tegra_gem_prime_map_dma_buf,
 623         .unmap_dma_buf = tegra_gem_prime_unmap_dma_buf,
 624         .release = tegra_gem_prime_release,
 625         .map_atomic = tegra_gem_prime_kmap_atomic,
 626         .unmap_atomic = tegra_gem_prime_kunmap_atomic,
 627         .map = tegra_gem_prime_kmap,
 628         .unmap = tegra_gem_prime_kunmap,
 629         .mmap = tegra_gem_prime_mmap,
 630         .vmap = tegra_gem_prime_vmap,
 631         .vunmap = tegra_gem_prime_vunmap,
 632 };
 633
 634 struct dma_buf *tegra_gem_prime_export(struct drm_device *drm,
 635                                        struct drm_gem_object *gem,
 636                                        int flags)
 637 {
 638         DEFINE_DMA_BUF_EXPORT_INFO(exp_info);
 639
 640         exp_info.ops = &tegra_gem_prime_dmabuf_ops;
 641         exp_info.size = gem->size;
 642         exp_info.flags = flags;
 643         exp_info.priv = gem;
 644
 645         return drm_gem_dmabuf_export(drm, &exp_info);
 646 }
 647
 648 struct drm_gem_object *tegra_gem_prime_import(struct drm_device *drm,
 649                                               struct dma_buf *buf)
 650 {
 651         struct tegra_bo *bo;
 652
 653         if (buf->ops == &tegra_gem_prime_dmabuf_ops) {
 654                 struct drm_gem_object *gem = buf->priv;
 655
 656                 if (gem->dev == drm) {
 657                         drm_gem_object_reference(gem);
 658                         return gem;
 659                 }
 660         }
 661
 662         bo = tegra_bo_import(drm, buf);
 663         if (IS_ERR(bo))
 664                 return ERR_CAST(bo);
 665
 666         return &bo->gem;
 667 }