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