drivers/gpu/drm/exynos/exynos_drm_gem.c

   1 /* exynos_drm_gem.c
   2  *
   3  * Copyright (c) 2011 Samsung Electronics Co., Ltd.
   4  * Author: Inki Dae <inki.dae@samsung.com>
   5  *
   6  * This program is free software; you can redistribute  it and/or modify it
   7  * under  the terms of  the GNU General  Public License as published by the
   8  * Free Software Foundation;  either version 2 of the  License, or (at your
   9  * option) any later version.
  10  */
  11
  12 #include <drm/drmP.h>
  13
  14 #include <linux/shmem_fs.h>
  15 #include <drm/exynos_drm.h>
  16
  17 #include "exynos_drm_drv.h"
  18 #include "exynos_drm_gem.h"
  19 #include "exynos_drm_buf.h"
  20
  21 static unsigned int convert_to_vm_err_msg(int msg)
  22 {
  23         unsigned int out_msg;
  24
  25         switch (msg) {
  26         case 0:
  27         case -ERESTARTSYS:
  28         case -EINTR:
  29                 out_msg = VM_FAULT_NOPAGE;
  30                 break;
  31
  32         case -ENOMEM:
  33                 out_msg = VM_FAULT_OOM;
  34                 break;
  35
  36         default:
  37                 out_msg = VM_FAULT_SIGBUS;
  38                 break;
  39         }
  40
  41         return out_msg;
  42 }
  43
  44 static int check_gem_flags(unsigned int flags)
  45 {
  46         if (flags & ~(EXYNOS_BO_MASK)) {
  47                 DRM_ERROR("invalid flags.\n");
  48                 return -EINVAL;
  49         }
  50
  51         return 0;
  52 }
  53
  54 static void update_vm_cache_attr(struct exynos_drm_gem_obj *obj,
  55                                         struct vm_area_struct *vma)
  56 {
  57         DRM_DEBUG_KMS("flags = 0x%x\n", obj->flags);
  58
  59         /* non-cachable as default. */
  60         if (obj->flags & EXYNOS_BO_CACHABLE)
  61                 vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
  62         else if (obj->flags & EXYNOS_BO_WC)
  63                 vma->vm_page_prot =
  64                         pgprot_writecombine(vm_get_page_prot(vma->vm_flags));
  65         else
  66                 vma->vm_page_prot =
  67                         pgprot_noncached(vm_get_page_prot(vma->vm_flags));
  68 }
  69
  70 static unsigned long roundup_gem_size(unsigned long size, unsigned int flags)
  71 {
  72         /* TODO */
  73
  74         return roundup(size, PAGE_SIZE);
  75 }
  76
  77 static int exynos_drm_gem_map_buf(struct drm_gem_object *obj,
  78                                         struct vm_area_struct *vma,
  79                                         unsigned long f_vaddr,
  80                                         pgoff_t page_offset)
  81 {
  82         struct exynos_drm_gem_obj *exynos_gem_obj = to_exynos_gem_obj(obj);
  83         struct exynos_drm_gem_buf *buf = exynos_gem_obj->buffer;
  84         struct scatterlist *sgl;
  85         unsigned long pfn;
  86         int i;
  87
  88         if (!buf->sgt)
  89                 return -EINTR;
  90
  91         if (page_offset >= (buf->size >> PAGE_SHIFT)) {
  92                 DRM_ERROR("invalid page offset\n");
  93                 return -EINVAL;
  94         }
  95
  96         sgl = buf->sgt->sgl;
  97         for_each_sg(buf->sgt->sgl, sgl, buf->sgt->nents, i) {
  98                 if (page_offset < (sgl->length >> PAGE_SHIFT))
  99                         break;
 100                 page_offset -=  (sgl->length >> PAGE_SHIFT);
 101         }
 102
 103         pfn = __phys_to_pfn(sg_phys(sgl)) + page_offset;
 104
 105         return vm_insert_mixed(vma, f_vaddr, pfn);
 106 }
 107
 108 static int exynos_drm_gem_handle_create(struct drm_gem_object *obj,
 109                                         struct drm_file *file_priv,
 110                                         unsigned int *handle)
 111 {
 112         int ret;
 113
 114         /*
 115          * allocate a id of idr table where the obj is registered
 116          * and handle has the id what user can see.
 117          */
 118         ret = drm_gem_handle_create(file_priv, obj, handle);
 119         if (ret)
 120                 return ret;
 121
 122         DRM_DEBUG_KMS("gem handle = 0x%x\n", *handle);
 123
 124         /* drop reference from allocate - handle holds it now. */
 125         drm_gem_object_unreference_unlocked(obj);
 126
 127         return 0;
 128 }
 129
 130 void exynos_drm_gem_destroy(struct exynos_drm_gem_obj *exynos_gem_obj)
 131 {
 132         struct drm_gem_object *obj;
 133         struct exynos_drm_gem_buf *buf;
 134
 135         DRM_DEBUG_KMS("%s\n", __FILE__);
 136
 137         obj = &exynos_gem_obj->base;
 138         buf = exynos_gem_obj->buffer;
 139
 140         DRM_DEBUG_KMS("handle count = %d\n", atomic_read(&obj->handle_count));
 141
 142         /*
 143          * do not release memory region from exporter.
 144          *
 145          * the region will be released by exporter
 146          * once dmabuf's refcount becomes 0.
 147          */
 148         if (obj->import_attach)
 149                 goto out;
 150
 151         exynos_drm_free_buf(obj->dev, exynos_gem_obj->flags, buf);
 152
 153 out:
 154         exynos_drm_fini_buf(obj->dev, buf);
 155         exynos_gem_obj->buffer = NULL;
 156
 157         if (obj->map_list.map)
 158                 drm_gem_free_mmap_offset(obj);
 159
 160         /* release file pointer to gem object. */
 161         drm_gem_object_release(obj);
 162
 163         kfree(exynos_gem_obj);
 164         exynos_gem_obj = NULL;
 165 }
 166
 167 struct exynos_drm_gem_obj *exynos_drm_gem_init(struct drm_device *dev,
 168                                                       unsigned long size)
 169 {
 170         struct exynos_drm_gem_obj *exynos_gem_obj;
 171         struct drm_gem_object *obj;
 172         int ret;
 173
 174         exynos_gem_obj = kzalloc(sizeof(*exynos_gem_obj), GFP_KERNEL);
 175         if (!exynos_gem_obj) {
 176                 DRM_ERROR("failed to allocate exynos gem object\n");
 177                 return NULL;
 178         }
 179
 180         exynos_gem_obj->size = size;
 181         obj = &exynos_gem_obj->base;
 182
 183         ret = drm_gem_object_init(dev, obj, size);
 184         if (ret < 0) {
 185                 DRM_ERROR("failed to initialize gem object\n");
 186                 kfree(exynos_gem_obj);
 187                 return NULL;
 188         }
 189
 190         DRM_DEBUG_KMS("created file object = 0x%x\n", (unsigned int)obj->filp);
 191
 192         return exynos_gem_obj;
 193 }
 194
 195 struct exynos_drm_gem_obj *exynos_drm_gem_create(struct drm_device *dev,
 196                                                 unsigned int flags,
 197                                                 unsigned long size)
 198 {
 199         struct exynos_drm_gem_obj *exynos_gem_obj;
 200         struct exynos_drm_gem_buf *buf;
 201         int ret;
 202
 203         if (!size) {
 204                 DRM_ERROR("invalid size.\n");
 205                 return ERR_PTR(-EINVAL);
 206         }
 207
 208         size = roundup_gem_size(size, flags);
 209         DRM_DEBUG_KMS("%s\n", __FILE__);
 210
 211         ret = check_gem_flags(flags);
 212         if (ret)
 213                 return ERR_PTR(ret);
 214
 215         buf = exynos_drm_init_buf(dev, size);
 216         if (!buf)
 217                 return ERR_PTR(-ENOMEM);
 218
 219         exynos_gem_obj = exynos_drm_gem_init(dev, size);
 220         if (!exynos_gem_obj) {
 221                 ret = -ENOMEM;
 222                 goto err_fini_buf;
 223         }
 224
 225         exynos_gem_obj->buffer = buf;
 226
 227         /* set memory type and cache attribute from user side. */
 228         exynos_gem_obj->flags = flags;
 229
 230         ret = exynos_drm_alloc_buf(dev, buf, flags);
 231         if (ret < 0) {
 232                 drm_gem_object_release(&exynos_gem_obj->base);
 233                 goto err_fini_buf;
 234         }
 235
 236         return exynos_gem_obj;
 237
 238 err_fini_buf:
 239         exynos_drm_fini_buf(dev, buf);
 240         return ERR_PTR(ret);
 241 }
 242
 243 int exynos_drm_gem_create_ioctl(struct drm_device *dev, void *data,
 244                                 struct drm_file *file_priv)
 245 {
 246         struct drm_exynos_gem_create *args = data;
 247         struct exynos_drm_gem_obj *exynos_gem_obj;
 248         int ret;
 249
 250         DRM_DEBUG_KMS("%s\n", __FILE__);
 251
 252         exynos_gem_obj = exynos_drm_gem_create(dev, args->flags, args->size);
 253         if (IS_ERR(exynos_gem_obj))
 254                 return PTR_ERR(exynos_gem_obj);
 255
 256         ret = exynos_drm_gem_handle_create(&exynos_gem_obj->base, file_priv,
 257                         &args->handle);
 258         if (ret) {
 259                 exynos_drm_gem_destroy(exynos_gem_obj);
 260                 return ret;
 261         }
 262
 263         return 0;
 264 }
 265
 266 dma_addr_t *exynos_drm_gem_get_dma_addr(struct drm_device *dev,
 267                                         unsigned int gem_handle,
 268                                         struct drm_file *filp)
 269 {
 270         struct exynos_drm_gem_obj *exynos_gem_obj;
 271         struct drm_gem_object *obj;
 272
 273         obj = drm_gem_object_lookup(dev, filp, gem_handle);
 274         if (!obj) {
 275                 DRM_ERROR("failed to lookup gem object.\n");
 276                 return ERR_PTR(-EINVAL);
 277         }
 278
 279         exynos_gem_obj = to_exynos_gem_obj(obj);
 280
 281         return &exynos_gem_obj->buffer->dma_addr;
 282 }
 283
 284 void exynos_drm_gem_put_dma_addr(struct drm_device *dev,
 285                                         unsigned int gem_handle,
 286                                         struct drm_file *filp)
 287 {
 288         struct exynos_drm_gem_obj *exynos_gem_obj;
 289         struct drm_gem_object *obj;
 290
 291         obj = drm_gem_object_lookup(dev, filp, gem_handle);
 292         if (!obj) {
 293                 DRM_ERROR("failed to lookup gem object.\n");
 294                 return;
 295         }
 296
 297         exynos_gem_obj = to_exynos_gem_obj(obj);
 298
 299         drm_gem_object_unreference_unlocked(obj);
 300
 301         /*
 302          * decrease obj->refcount one more time because we has already
 303          * increased it at exynos_drm_gem_get_dma_addr().
 304          */
 305         drm_gem_object_unreference_unlocked(obj);
 306 }
 307
 308 int exynos_drm_gem_map_offset_ioctl(struct drm_device *dev, void *data,
 309                                     struct drm_file *file_priv)
 310 {
 311         struct drm_exynos_gem_map_off *args = data;
 312
 313         DRM_DEBUG_KMS("%s\n", __FILE__);
 314
 315         DRM_DEBUG_KMS("handle = 0x%x, offset = 0x%lx\n",
 316                         args->handle, (unsigned long)args->offset);
 317
 318         if (!(dev->driver->driver_features & DRIVER_GEM)) {
 319                 DRM_ERROR("does not support GEM.\n");
 320                 return -ENODEV;
 321         }
 322
 323         return exynos_drm_gem_dumb_map_offset(file_priv, dev, args->handle,
 324                         &args->offset);
 325 }
 326
 327 static struct drm_file *exynos_drm_find_drm_file(struct drm_device *drm_dev,
 328                                                         struct file *filp)
 329 {
 330         struct drm_file *file_priv;
 331
 332         mutex_lock(&drm_dev->struct_mutex);
 333
 334         /* find current process's drm_file from filelist. */
 335         list_for_each_entry(file_priv, &drm_dev->filelist, lhead) {
 336                 if (file_priv->filp == filp) {
 337                         mutex_unlock(&drm_dev->struct_mutex);
 338                         return file_priv;
 339                 }
 340         }
 341
 342         mutex_unlock(&drm_dev->struct_mutex);
 343         WARN_ON(1);
 344
 345         return ERR_PTR(-EFAULT);
 346 }
 347
 348 static int exynos_drm_gem_mmap_buffer(struct file *filp,
 349                                       struct vm_area_struct *vma)
 350 {
 351         struct drm_gem_object *obj = filp->private_data;
 352         struct exynos_drm_gem_obj *exynos_gem_obj = to_exynos_gem_obj(obj);
 353         struct drm_device *drm_dev = obj->dev;
 354         struct exynos_drm_gem_buf *buffer;
 355         struct drm_file *file_priv;
 356         unsigned long vm_size;
 357         int ret;
 358
 359         DRM_DEBUG_KMS("%s\n", __FILE__);
 360
 361         vma->vm_flags |= VM_IO | VM_DONTEXPAND | VM_DONTDUMP;
 362         vma->vm_private_data = obj;
 363         vma->vm_ops = drm_dev->driver->gem_vm_ops;
 364
 365         /* restore it to driver's fops. */
 366         filp->f_op = fops_get(drm_dev->driver->fops);
 367
 368         file_priv = exynos_drm_find_drm_file(drm_dev, filp);
 369         if (IS_ERR(file_priv))
 370                 return PTR_ERR(file_priv);
 371
 372         /* restore it to drm_file. */
 373         filp->private_data = file_priv;
 374
 375         update_vm_cache_attr(exynos_gem_obj, vma);
 376
 377         vm_size = vma->vm_end - vma->vm_start;
 378
 379         /*
 380          * a buffer contains information to physically continuous memory
 381          * allocated by user request or at framebuffer creation.
 382          */
 383         buffer = exynos_gem_obj->buffer;
 384
 385         /* check if user-requested size is valid. */
 386         if (vm_size > buffer->size)
 387                 return -EINVAL;
 388
 389         ret = dma_mmap_attrs(drm_dev->dev, vma, buffer->pages,
 390                                 buffer->dma_addr, buffer->size,
 391                                 &buffer->dma_attrs);
 392         if (ret < 0) {
 393                 DRM_ERROR("failed to mmap.\n");
 394                 return ret;
 395         }
 396
 397         /*
 398          * take a reference to this mapping of the object. And this reference
 399          * is unreferenced by the corresponding vm_close call.
 400          */
 401         drm_gem_object_reference(obj);
 402
 403         mutex_lock(&drm_dev->struct_mutex);
 404         drm_vm_open_locked(drm_dev, vma);
 405         mutex_unlock(&drm_dev->struct_mutex);
 406
 407         return 0;
 408 }
 409
 410 static const struct file_operations exynos_drm_gem_fops = {
 411         .mmap = exynos_drm_gem_mmap_buffer,
 412 };
 413
 414 int exynos_drm_gem_mmap_ioctl(struct drm_device *dev, void *data,
 415                               struct drm_file *file_priv)
 416 {
 417         struct drm_exynos_gem_mmap *args = data;
 418         struct drm_gem_object *obj;
 419         unsigned int addr;
 420
 421         DRM_DEBUG_KMS("%s\n", __FILE__);
 422
 423         if (!(dev->driver->driver_features & DRIVER_GEM)) {
 424                 DRM_ERROR("does not support GEM.\n");
 425                 return -ENODEV;
 426         }
 427
 428         obj = drm_gem_object_lookup(dev, file_priv, args->handle);
 429         if (!obj) {
 430                 DRM_ERROR("failed to lookup gem object.\n");
 431                 return -EINVAL;
 432         }
 433
 434         /*
 435          * Set specific mmper's fops. And it will be restored by
 436          * exynos_drm_gem_mmap_buffer to dev->driver->fops.
 437          * This is used to call specific mapper temporarily.
 438          */
 439         file_priv->filp->f_op = &exynos_drm_gem_fops;
 440
 441         /*
 442          * Set gem object to private_data so that specific mmaper
 443          * can get the gem object. And it will be restored by
 444          * exynos_drm_gem_mmap_buffer to drm_file.
 445          */
 446         file_priv->filp->private_data = obj;
 447
 448         addr = vm_mmap(file_priv->filp, 0, args->size,
 449                         PROT_READ | PROT_WRITE, MAP_SHARED, 0);
 450
 451         drm_gem_object_unreference_unlocked(obj);
 452
 453         if (IS_ERR((void *)addr)) {
 454                 file_priv->filp->private_data = file_priv;
 455                 return PTR_ERR((void *)addr);
 456         }
 457
 458         args->mapped = addr;
 459
 460         DRM_DEBUG_KMS("mapped = 0x%lx\n", (unsigned long)args->mapped);
 461
 462         return 0;
 463 }
 464
 465 int exynos_drm_gem_get_ioctl(struct drm_device *dev, void *data,
 466                                       struct drm_file *file_priv)
 467 {       struct exynos_drm_gem_obj *exynos_gem_obj;
 468         struct drm_exynos_gem_info *args = data;
 469         struct drm_gem_object *obj;
 470
 471         mutex_lock(&dev->struct_mutex);
 472
 473         obj = drm_gem_object_lookup(dev, file_priv, args->handle);
 474         if (!obj) {
 475                 DRM_ERROR("failed to lookup gem object.\n");
 476                 mutex_unlock(&dev->struct_mutex);
 477                 return -EINVAL;
 478         }
 479
 480         exynos_gem_obj = to_exynos_gem_obj(obj);
 481
 482         args->flags = exynos_gem_obj->flags;
 483         args->size = exynos_gem_obj->size;
 484
 485         drm_gem_object_unreference(obj);
 486         mutex_unlock(&dev->struct_mutex);
 487
 488         return 0;
 489 }
 490
 491 struct vm_area_struct *exynos_gem_get_vma(struct vm_area_struct *vma)
 492 {
 493         struct vm_area_struct *vma_copy;
 494
 495         vma_copy = kmalloc(sizeof(*vma_copy), GFP_KERNEL);
 496         if (!vma_copy)
 497                 return NULL;
 498
 499         if (vma->vm_ops && vma->vm_ops->open)
 500                 vma->vm_ops->open(vma);
 501
 502         if (vma->vm_file)
 503                 get_file(vma->vm_file);
 504
 505         memcpy(vma_copy, vma, sizeof(*vma));
 506
 507         vma_copy->vm_mm = NULL;
 508         vma_copy->vm_next = NULL;
 509         vma_copy->vm_prev = NULL;
 510
 511         return vma_copy;
 512 }
 513
 514 void exynos_gem_put_vma(struct vm_area_struct *vma)
 515 {
 516         if (!vma)
 517                 return;
 518
 519         if (vma->vm_ops && vma->vm_ops->close)
 520                 vma->vm_ops->close(vma);
 521
 522         if (vma->vm_file)
 523                 fput(vma->vm_file);
 524
 525         kfree(vma);
 526 }
 527
 528 int exynos_gem_get_pages_from_userptr(unsigned long start,
 529                                                 unsigned int npages,
 530                                                 struct page **pages,
 531                                                 struct vm_area_struct *vma)
 532 {
 533         int get_npages;
 534
 535         /* the memory region mmaped with VM_PFNMAP. */
 536         if (vma_is_io(vma)) {
 537                 unsigned int i;
 538
 539                 for (i = 0; i < npages; ++i, start += PAGE_SIZE) {
 540                         unsigned long pfn;
 541                         int ret = follow_pfn(vma, start, &pfn);
 542                         if (ret)
 543                                 return ret;
 544
 545                         pages[i] = pfn_to_page(pfn);
 546                 }
 547
 548                 if (i != npages) {
 549                         DRM_ERROR("failed to get user_pages.\n");
 550                         return -EINVAL;
 551                 }
 552
 553                 return 0;
 554         }
 555
 556         get_npages = get_user_pages(current, current->mm, start,
 557                                         npages, 1, 1, pages, NULL);
 558         get_npages = max(get_npages, 0);
 559         if (get_npages != npages) {
 560                 DRM_ERROR("failed to get user_pages.\n");
 561                 while (get_npages)
 562                         put_page(pages[--get_npages]);
 563                 return -EFAULT;
 564         }
 565
 566         return 0;
 567 }
 568
 569 void exynos_gem_put_pages_to_userptr(struct page **pages,
 570                                         unsigned int npages,
 571                                         struct vm_area_struct *vma)
 572 {
 573         if (!vma_is_io(vma)) {
 574                 unsigned int i;
 575
 576                 for (i = 0; i < npages; i++) {
 577                         set_page_dirty_lock(pages[i]);
 578
 579                         /*
 580                          * undo the reference we took when populating
 581                          * the table.
 582                          */
 583                         put_page(pages[i]);
 584                 }
 585         }
 586 }
 587
 588 int exynos_gem_map_sgt_with_dma(struct drm_device *drm_dev,
 589                                 struct sg_table *sgt,
 590                                 enum dma_data_direction dir)
 591 {
 592         int nents;
 593
 594         mutex_lock(&drm_dev->struct_mutex);
 595
 596         nents = dma_map_sg(drm_dev->dev, sgt->sgl, sgt->nents, dir);
 597         if (!nents) {
 598                 DRM_ERROR("failed to map sgl with dma.\n");
 599                 mutex_unlock(&drm_dev->struct_mutex);
 600                 return nents;
 601         }
 602
 603         mutex_unlock(&drm_dev->struct_mutex);
 604         return 0;
 605 }
 606
 607 void exynos_gem_unmap_sgt_from_dma(struct drm_device *drm_dev,
 608                                 struct sg_table *sgt,
 609                                 enum dma_data_direction dir)
 610 {
 611         dma_unmap_sg(drm_dev->dev, sgt->sgl, sgt->nents, dir);
 612 }
 613
 614 int exynos_drm_gem_init_object(struct drm_gem_object *obj)
 615 {
 616         DRM_DEBUG_KMS("%s\n", __FILE__);
 617
 618         return 0;
 619 }
 620
 621 void exynos_drm_gem_free_object(struct drm_gem_object *obj)
 622 {
 623         struct exynos_drm_gem_obj *exynos_gem_obj;
 624         struct exynos_drm_gem_buf *buf;
 625
 626         DRM_DEBUG_KMS("%s\n", __FILE__);
 627
 628         exynos_gem_obj = to_exynos_gem_obj(obj);
 629         buf = exynos_gem_obj->buffer;
 630
 631         if (obj->import_attach)
 632                 drm_prime_gem_destroy(obj, buf->sgt);
 633
 634         exynos_drm_gem_destroy(to_exynos_gem_obj(obj));
 635 }
 636
 637 int exynos_drm_gem_dumb_create(struct drm_file *file_priv,
 638                                struct drm_device *dev,
 639                                struct drm_mode_create_dumb *args)
 640 {
 641         struct exynos_drm_gem_obj *exynos_gem_obj;
 642         int ret;
 643
 644         DRM_DEBUG_KMS("%s\n", __FILE__);
 645
 646         /*
 647          * alocate memory to be used for framebuffer.
 648          * - this callback would be called by user application
 649          *      with DRM_IOCTL_MODE_CREATE_DUMB command.
 650          */
 651
 652         args->pitch = args->width * ((args->bpp + 7) / 8);
 653         args->size = args->pitch * args->height;
 654
 655         exynos_gem_obj = exynos_drm_gem_create(dev, args->flags, args->size);
 656         if (IS_ERR(exynos_gem_obj))
 657                 return PTR_ERR(exynos_gem_obj);
 658
 659         ret = exynos_drm_gem_handle_create(&exynos_gem_obj->base, file_priv,
 660                         &args->handle);
 661         if (ret) {
 662                 exynos_drm_gem_destroy(exynos_gem_obj);
 663                 return ret;
 664         }
 665
 666         return 0;
 667 }
 668
 669 int exynos_drm_gem_dumb_map_offset(struct drm_file *file_priv,
 670                                    struct drm_device *dev, uint32_t handle,
 671                                    uint64_t *offset)
 672 {
 673         struct drm_gem_object *obj;
 674         int ret = 0;
 675
 676         DRM_DEBUG_KMS("%s\n", __FILE__);
 677
 678         mutex_lock(&dev->struct_mutex);
 679
 680         /*
 681          * get offset of memory allocated for drm framebuffer.
 682          * - this callback would be called by user application
 683          *      with DRM_IOCTL_MODE_MAP_DUMB command.
 684          */
 685
 686         obj = drm_gem_object_lookup(dev, file_priv, handle);
 687         if (!obj) {
 688                 DRM_ERROR("failed to lookup gem object.\n");
 689                 ret = -EINVAL;
 690                 goto unlock;
 691         }
 692
 693         if (!obj->map_list.map) {
 694                 ret = drm_gem_create_mmap_offset(obj);
 695                 if (ret)
 696                         goto out;
 697         }
 698
 699         *offset = (u64)obj->map_list.hash.key << PAGE_SHIFT;
 700         DRM_DEBUG_KMS("offset = 0x%lx\n", (unsigned long)*offset);
 701
 702 out:
 703         drm_gem_object_unreference(obj);
 704 unlock:
 705         mutex_unlock(&dev->struct_mutex);
 706         return ret;
 707 }
 708
 709 int exynos_drm_gem_dumb_destroy(struct drm_file *file_priv,
 710                                 struct drm_device *dev,
 711                                 unsigned int handle)
 712 {
 713         int ret;
 714
 715         DRM_DEBUG_KMS("%s\n", __FILE__);
 716
 717         /*
 718          * obj->refcount and obj->handle_count are decreased and
 719          * if both them are 0 then exynos_drm_gem_free_object()
 720          * would be called by callback to release resources.
 721          */
 722         ret = drm_gem_handle_delete(file_priv, handle);
 723         if (ret < 0) {
 724                 DRM_ERROR("failed to delete drm_gem_handle.\n");
 725                 return ret;
 726         }
 727
 728         return 0;
 729 }
 730
 731 int exynos_drm_gem_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
 732 {
 733         struct drm_gem_object *obj = vma->vm_private_data;
 734         struct drm_device *dev = obj->dev;
 735         unsigned long f_vaddr;
 736         pgoff_t page_offset;
 737         int ret;
 738
 739         page_offset = ((unsigned long)vmf->virtual_address -
 740                         vma->vm_start) >> PAGE_SHIFT;
 741         f_vaddr = (unsigned long)vmf->virtual_address;
 742
 743         mutex_lock(&dev->struct_mutex);
 744
 745         ret = exynos_drm_gem_map_buf(obj, vma, f_vaddr, page_offset);
 746         if (ret < 0)
 747                 DRM_ERROR("failed to map a buffer with user.\n");
 748
 749         mutex_unlock(&dev->struct_mutex);
 750
 751         return convert_to_vm_err_msg(ret);
 752 }
 753
 754 int exynos_drm_gem_mmap(struct file *filp, struct vm_area_struct *vma)
 755 {
 756         struct exynos_drm_gem_obj *exynos_gem_obj;
 757         struct drm_gem_object *obj;
 758         int ret;
 759
 760         DRM_DEBUG_KMS("%s\n", __FILE__);
 761
 762         /* set vm_area_struct. */
 763         ret = drm_gem_mmap(filp, vma);
 764         if (ret < 0) {
 765                 DRM_ERROR("failed to mmap.\n");
 766                 return ret;
 767         }
 768
 769         obj = vma->vm_private_data;
 770         exynos_gem_obj = to_exynos_gem_obj(obj);
 771
 772         ret = check_gem_flags(exynos_gem_obj->flags);
 773         if (ret) {
 774                 drm_gem_vm_close(vma);
 775                 drm_gem_free_mmap_offset(obj);
 776                 return ret;
 777         }
 778
 779         vma->vm_flags &= ~VM_PFNMAP;
 780         vma->vm_flags |= VM_MIXEDMAP;
 781
 782         update_vm_cache_attr(exynos_gem_obj, vma);
 783
 784         return ret;
 785 }