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 exynos_drm_gem_obj *exynos_gem_obj;
 305         struct drm_gem_object *obj;
 306
 307         obj = drm_gem_object_lookup(dev, filp, gem_handle);
 308         if (!obj) {
 309                 DRM_ERROR("failed to lookup gem object.\n");
 310                 return;
 311         }
 312
 313         exynos_gem_obj = to_exynos_gem_obj(obj);
 314
 315         drm_gem_object_unreference_unlocked(obj);
 316
 317         /*
 318          * decrease obj->refcount one more time because we has already
 319          * increased it at exynos_drm_gem_get_dma_addr().
 320          */
 321         drm_gem_object_unreference_unlocked(obj);
 322 }
 323
 324 int exynos_drm_gem_map_offset_ioctl(struct drm_device *dev, void *data,
 325                                     struct drm_file *file_priv)
 326 {
 327         struct drm_exynos_gem_map_off *args = data;
 328
 329         DRM_DEBUG_KMS("handle = 0x%x, offset = 0x%lx\n",
 330                         args->handle, (unsigned long)args->offset);
 331
 332         if (!(dev->driver->driver_features & DRIVER_GEM)) {
 333                 DRM_ERROR("does not support GEM.\n");
 334                 return -ENODEV;
 335         }
 336
 337         return exynos_drm_gem_dumb_map_offset(file_priv, dev, args->handle,
 338                         &args->offset);
 339 }
 340
 341 int exynos_drm_gem_mmap_buffer(struct file *filp,
 342                                       struct vm_area_struct *vma)
 343 {
 344         struct drm_gem_object *obj = filp->private_data;
 345         struct exynos_drm_gem_obj *exynos_gem_obj = to_exynos_gem_obj(obj);
 346         struct drm_device *drm_dev = obj->dev;
 347         struct exynos_drm_gem_buf *buffer;
 348         unsigned long vm_size;
 349         int ret;
 350
 351         WARN_ON(!mutex_is_locked(&obj->dev->struct_mutex));
 352
 353         vma->vm_flags |= VM_IO | VM_DONTEXPAND | VM_DONTDUMP;
 354         vma->vm_private_data = obj;
 355         vma->vm_ops = drm_dev->driver->gem_vm_ops;
 356
 357         update_vm_cache_attr(exynos_gem_obj, vma);
 358
 359         vm_size = vma->vm_end - vma->vm_start;
 360
 361         /*
 362          * a buffer contains information to physically continuous memory
 363          * allocated by user request or at framebuffer creation.
 364          */
 365         buffer = exynos_gem_obj->buffer;
 366
 367         /* check if user-requested size is valid. */
 368         if (vm_size > buffer->size)
 369                 return -EINVAL;
 370
 371         ret = dma_mmap_attrs(drm_dev->dev, vma, buffer->pages,
 372                                 buffer->dma_addr, buffer->size,
 373                                 &buffer->dma_attrs);
 374         if (ret < 0) {
 375                 DRM_ERROR("failed to mmap.\n");
 376                 return ret;
 377         }
 378
 379         /*
 380          * take a reference to this mapping of the object. And this reference
 381          * is unreferenced by the corresponding vm_close call.
 382          */
 383         drm_gem_object_reference(obj);
 384
 385         drm_vm_open_locked(drm_dev, vma);
 386
 387         return 0;
 388 }
 389
 390 int exynos_drm_gem_mmap_ioctl(struct drm_device *dev, void *data,
 391                               struct drm_file *file_priv)
 392 {
 393         struct drm_exynos_file_private *exynos_file_priv;
 394         struct drm_exynos_gem_mmap *args = data;
 395         struct drm_gem_object *obj;
 396         struct file *anon_filp;
 397         unsigned long addr;
 398
 399         if (!(dev->driver->driver_features & DRIVER_GEM)) {
 400                 DRM_ERROR("does not support GEM.\n");
 401                 return -ENODEV;
 402         }
 403
 404         mutex_lock(&dev->struct_mutex);
 405
 406         obj = drm_gem_object_lookup(dev, file_priv, args->handle);
 407         if (!obj) {
 408                 DRM_ERROR("failed to lookup gem object.\n");
 409                 mutex_unlock(&dev->struct_mutex);
 410                 return -EINVAL;
 411         }
 412
 413         exynos_file_priv = file_priv->driver_priv;
 414         anon_filp = exynos_file_priv->anon_filp;
 415         anon_filp->private_data = obj;
 416
 417         addr = vm_mmap(anon_filp, 0, args->size, PROT_READ | PROT_WRITE,
 418                         MAP_SHARED, 0);
 419
 420         drm_gem_object_unreference(obj);
 421
 422         if (IS_ERR_VALUE(addr)) {
 423                 mutex_unlock(&dev->struct_mutex);
 424                 return (int)addr;
 425         }
 426
 427         mutex_unlock(&dev->struct_mutex);
 428
 429         args->mapped = addr;
 430
 431         DRM_DEBUG_KMS("mapped = 0x%lx\n", (unsigned long)args->mapped);
 432
 433         return 0;
 434 }
 435
 436 int exynos_drm_gem_get_ioctl(struct drm_device *dev, void *data,
 437                                       struct drm_file *file_priv)
 438 {       struct exynos_drm_gem_obj *exynos_gem_obj;
 439         struct drm_exynos_gem_info *args = data;
 440         struct drm_gem_object *obj;
 441
 442         mutex_lock(&dev->struct_mutex);
 443
 444         obj = drm_gem_object_lookup(dev, file_priv, args->handle);
 445         if (!obj) {
 446                 DRM_ERROR("failed to lookup gem object.\n");
 447                 mutex_unlock(&dev->struct_mutex);
 448                 return -EINVAL;
 449         }
 450
 451         exynos_gem_obj = to_exynos_gem_obj(obj);
 452
 453         args->flags = exynos_gem_obj->flags;
 454         args->size = exynos_gem_obj->size;
 455
 456         drm_gem_object_unreference(obj);
 457         mutex_unlock(&dev->struct_mutex);
 458
 459         return 0;
 460 }
 461
 462 struct vm_area_struct *exynos_gem_get_vma(struct vm_area_struct *vma)
 463 {
 464         struct vm_area_struct *vma_copy;
 465
 466         vma_copy = kmalloc(sizeof(*vma_copy), GFP_KERNEL);
 467         if (!vma_copy)
 468                 return NULL;
 469
 470         if (vma->vm_ops && vma->vm_ops->open)
 471                 vma->vm_ops->open(vma);
 472
 473         if (vma->vm_file)
 474                 get_file(vma->vm_file);
 475
 476         memcpy(vma_copy, vma, sizeof(*vma));
 477
 478         vma_copy->vm_mm = NULL;
 479         vma_copy->vm_next = NULL;
 480         vma_copy->vm_prev = NULL;
 481
 482         return vma_copy;
 483 }
 484
 485 void exynos_gem_put_vma(struct vm_area_struct *vma)
 486 {
 487         if (!vma)
 488                 return;
 489
 490         if (vma->vm_ops && vma->vm_ops->close)
 491                 vma->vm_ops->close(vma);
 492
 493         if (vma->vm_file)
 494                 fput(vma->vm_file);
 495
 496         kfree(vma);
 497 }
 498
 499 int exynos_gem_get_pages_from_userptr(unsigned long start,
 500                                                 unsigned int npages,
 501                                                 struct page **pages,
 502                                                 struct vm_area_struct *vma)
 503 {
 504         int get_npages;
 505
 506         /* the memory region mmaped with VM_PFNMAP. */
 507         if (vma_is_io(vma)) {
 508                 unsigned int i;
 509
 510                 for (i = 0; i < npages; ++i, start += PAGE_SIZE) {
 511                         unsigned long pfn;
 512                         int ret = follow_pfn(vma, start, &pfn);
 513                         if (ret)
 514                                 return ret;
 515
 516                         pages[i] = pfn_to_page(pfn);
 517                 }
 518
 519                 if (i != npages) {
 520                         DRM_ERROR("failed to get user_pages.\n");
 521                         return -EINVAL;
 522                 }
 523
 524                 return 0;
 525         }
 526
 527         get_npages = get_user_pages(current, current->mm, start,
 528                                         npages, 1, 1, pages, NULL);
 529         get_npages = max(get_npages, 0);
 530         if (get_npages != npages) {
 531                 DRM_ERROR("failed to get user_pages.\n");
 532                 while (get_npages)
 533                         put_page(pages[--get_npages]);
 534                 return -EFAULT;
 535         }
 536
 537         return 0;
 538 }
 539
 540 void exynos_gem_put_pages_to_userptr(struct page **pages,
 541                                         unsigned int npages,
 542                                         struct vm_area_struct *vma)
 543 {
 544         if (!vma_is_io(vma)) {
 545                 unsigned int i;
 546
 547                 for (i = 0; i < npages; i++) {
 548                         set_page_dirty_lock(pages[i]);
 549
 550                         /*
 551                          * undo the reference we took when populating
 552                          * the table.
 553                          */
 554                         put_page(pages[i]);
 555                 }
 556         }
 557 }
 558
 559 int exynos_gem_map_sgt_with_dma(struct drm_device *drm_dev,
 560                                 struct sg_table *sgt,
 561                                 enum dma_data_direction dir)
 562 {
 563         int nents;
 564
 565         mutex_lock(&drm_dev->struct_mutex);
 566
 567         nents = dma_map_sg(drm_dev->dev, sgt->sgl, sgt->nents, dir);
 568         if (!nents) {
 569                 DRM_ERROR("failed to map sgl with dma.\n");
 570                 mutex_unlock(&drm_dev->struct_mutex);
 571                 return nents;
 572         }
 573
 574         mutex_unlock(&drm_dev->struct_mutex);
 575         return 0;
 576 }
 577
 578 void exynos_gem_unmap_sgt_from_dma(struct drm_device *drm_dev,
 579                                 struct sg_table *sgt,
 580                                 enum dma_data_direction dir)
 581 {
 582         dma_unmap_sg(drm_dev->dev, sgt->sgl, sgt->nents, dir);
 583 }
 584
 585 void exynos_drm_gem_free_object(struct drm_gem_object *obj)
 586 {
 587         struct exynos_drm_gem_obj *exynos_gem_obj;
 588         struct exynos_drm_gem_buf *buf;
 589
 590         exynos_gem_obj = to_exynos_gem_obj(obj);
 591         buf = exynos_gem_obj->buffer;
 592
 593         if (obj->import_attach)
 594                 drm_prime_gem_destroy(obj, buf->sgt);
 595
 596         exynos_drm_gem_destroy(to_exynos_gem_obj(obj));
 597 }
 598
 599 int exynos_drm_gem_dumb_create(struct drm_file *file_priv,
 600                                struct drm_device *dev,
 601                                struct drm_mode_create_dumb *args)
 602 {
 603         struct exynos_drm_gem_obj *exynos_gem_obj;
 604         int ret;
 605
 606         /*
 607          * alocate memory to be used for framebuffer.
 608          * - this callback would be called by user application
 609          *      with DRM_IOCTL_MODE_CREATE_DUMB command.
 610          */
 611
 612         args->pitch = args->width * ((args->bpp + 7) / 8);
 613         args->size = args->pitch * args->height;
 614
 615         exynos_gem_obj = exynos_drm_gem_create(dev, EXYNOS_BO_CONTIG |
 616                                                 EXYNOS_BO_WC, args->size);
 617         /*
 618          * If physically contiguous memory allocation fails and if IOMMU is
 619          * supported then try to get buffer from non physically contiguous
 620          * memory area.
 621          */
 622         if (IS_ERR(exynos_gem_obj) && is_drm_iommu_supported(dev)) {
 623                 dev_warn(dev->dev, "contiguous FB allocation failed, falling back to non-contiguous\n");
 624                 exynos_gem_obj = exynos_drm_gem_create(dev,
 625                                         EXYNOS_BO_NONCONTIG | EXYNOS_BO_WC,
 626                                         args->size);
 627         }
 628
 629         if (IS_ERR(exynos_gem_obj))
 630                 return PTR_ERR(exynos_gem_obj);
 631
 632         ret = exynos_drm_gem_handle_create(&exynos_gem_obj->base, file_priv,
 633                         &args->handle);
 634         if (ret) {
 635                 exynos_drm_gem_destroy(exynos_gem_obj);
 636                 return ret;
 637         }
 638
 639         return 0;
 640 }
 641
 642 int exynos_drm_gem_dumb_map_offset(struct drm_file *file_priv,
 643                                    struct drm_device *dev, uint32_t handle,
 644                                    uint64_t *offset)
 645 {
 646         struct drm_gem_object *obj;
 647         int ret = 0;
 648
 649         mutex_lock(&dev->struct_mutex);
 650
 651         /*
 652          * get offset of memory allocated for drm framebuffer.
 653          * - this callback would be called by user application
 654          *      with DRM_IOCTL_MODE_MAP_DUMB command.
 655          */
 656
 657         obj = drm_gem_object_lookup(dev, file_priv, handle);
 658         if (!obj) {
 659                 DRM_ERROR("failed to lookup gem object.\n");
 660                 ret = -EINVAL;
 661                 goto unlock;
 662         }
 663
 664         ret = drm_gem_create_mmap_offset(obj);
 665         if (ret)
 666                 goto out;
 667
 668         *offset = drm_vma_node_offset_addr(&obj->vma_node);
 669         DRM_DEBUG_KMS("offset = 0x%lx\n", (unsigned long)*offset);
 670
 671 out:
 672         drm_gem_object_unreference(obj);
 673 unlock:
 674         mutex_unlock(&dev->struct_mutex);
 675         return ret;
 676 }
 677
 678 int exynos_drm_gem_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
 679 {
 680         struct drm_gem_object *obj = vma->vm_private_data;
 681         struct drm_device *dev = obj->dev;
 682         unsigned long f_vaddr;
 683         pgoff_t page_offset;
 684         int ret;
 685
 686         page_offset = ((unsigned long)vmf->virtual_address -
 687                         vma->vm_start) >> PAGE_SHIFT;
 688         f_vaddr = (unsigned long)vmf->virtual_address;
 689
 690         mutex_lock(&dev->struct_mutex);
 691
 692         ret = exynos_drm_gem_map_buf(obj, vma, f_vaddr, page_offset);
 693         if (ret < 0)
 694                 DRM_ERROR("failed to map a buffer with user.\n");
 695
 696         mutex_unlock(&dev->struct_mutex);
 697
 698         return convert_to_vm_err_msg(ret);
 699 }
 700
 701 int exynos_drm_gem_mmap(struct file *filp, struct vm_area_struct *vma)
 702 {
 703         struct exynos_drm_gem_obj *exynos_gem_obj;
 704         struct drm_gem_object *obj;
 705         int ret;
 706
 707         /* set vm_area_struct. */
 708         ret = drm_gem_mmap(filp, vma);
 709         if (ret < 0) {
 710                 DRM_ERROR("failed to mmap.\n");
 711                 return ret;
 712         }
 713
 714         obj = vma->vm_private_data;
 715         exynos_gem_obj = to_exynos_gem_obj(obj);
 716
 717         ret = check_gem_flags(exynos_gem_obj->flags);
 718         if (ret) {
 719                 drm_gem_vm_close(vma);
 720                 drm_gem_free_mmap_offset(obj);
 721                 return ret;
 722         }
 723
 724         vma->vm_flags &= ~VM_PFNMAP;
 725         vma->vm_flags |= VM_MIXEDMAP;
 726
 727         update_vm_cache_attr(exynos_gem_obj, vma);
 728
 729         return ret;
 730 }