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