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 unsigned long exynos_drm_gem_get_size(struct drm_device *dev,
 168                                                 unsigned int gem_handle,
 169                                                 struct drm_file *file_priv)
 170 {
 171         struct exynos_drm_gem_obj *exynos_gem_obj;
 172         struct drm_gem_object *obj;
 173
 174         obj = drm_gem_object_lookup(dev, file_priv, gem_handle);
 175         if (!obj) {
 176                 DRM_ERROR("failed to lookup gem object.\n");
 177                 return 0;
 178         }
 179
 180         exynos_gem_obj = to_exynos_gem_obj(obj);
 181
 182         drm_gem_object_unreference_unlocked(obj);
 183
 184         return exynos_gem_obj->buffer->size;
 185 }
 186
 187
 188 struct exynos_drm_gem_obj *exynos_drm_gem_init(struct drm_device *dev,
 189                                                       unsigned long size)
 190 {
 191         struct exynos_drm_gem_obj *exynos_gem_obj;
 192         struct drm_gem_object *obj;
 193         int ret;
 194
 195         exynos_gem_obj = kzalloc(sizeof(*exynos_gem_obj), GFP_KERNEL);
 196         if (!exynos_gem_obj) {
 197                 DRM_ERROR("failed to allocate exynos gem object\n");
 198                 return NULL;
 199         }
 200
 201         exynos_gem_obj->size = size;
 202         obj = &exynos_gem_obj->base;
 203
 204         ret = drm_gem_object_init(dev, obj, size);
 205         if (ret < 0) {
 206                 DRM_ERROR("failed to initialize gem object\n");
 207                 kfree(exynos_gem_obj);
 208                 return NULL;
 209         }
 210
 211         DRM_DEBUG_KMS("created file object = 0x%x\n", (unsigned int)obj->filp);
 212
 213         return exynos_gem_obj;
 214 }
 215
 216 struct exynos_drm_gem_obj *exynos_drm_gem_create(struct drm_device *dev,
 217                                                 unsigned int flags,
 218                                                 unsigned long size)
 219 {
 220         struct exynos_drm_gem_obj *exynos_gem_obj;
 221         struct exynos_drm_gem_buf *buf;
 222         int ret;
 223
 224         if (!size) {
 225                 DRM_ERROR("invalid size.\n");
 226                 return ERR_PTR(-EINVAL);
 227         }
 228
 229         size = roundup_gem_size(size, flags);
 230         DRM_DEBUG_KMS("%s\n", __FILE__);
 231
 232         ret = check_gem_flags(flags);
 233         if (ret)
 234                 return ERR_PTR(ret);
 235
 236         buf = exynos_drm_init_buf(dev, size);
 237         if (!buf)
 238                 return ERR_PTR(-ENOMEM);
 239
 240         exynos_gem_obj = exynos_drm_gem_init(dev, size);
 241         if (!exynos_gem_obj) {
 242                 ret = -ENOMEM;
 243                 goto err_fini_buf;
 244         }
 245
 246         exynos_gem_obj->buffer = buf;
 247
 248         /* set memory type and cache attribute from user side. */
 249         exynos_gem_obj->flags = flags;
 250
 251         ret = exynos_drm_alloc_buf(dev, buf, flags);
 252         if (ret < 0) {
 253                 drm_gem_object_release(&exynos_gem_obj->base);
 254                 goto err_fini_buf;
 255         }
 256
 257         return exynos_gem_obj;
 258
 259 err_fini_buf:
 260         exynos_drm_fini_buf(dev, buf);
 261         return ERR_PTR(ret);
 262 }
 263
 264 int exynos_drm_gem_create_ioctl(struct drm_device *dev, void *data,
 265                                 struct drm_file *file_priv)
 266 {
 267         struct drm_exynos_gem_create *args = data;
 268         struct exynos_drm_gem_obj *exynos_gem_obj;
 269         int ret;
 270
 271         DRM_DEBUG_KMS("%s\n", __FILE__);
 272
 273         exynos_gem_obj = exynos_drm_gem_create(dev, args->flags, args->size);
 274         if (IS_ERR(exynos_gem_obj))
 275                 return PTR_ERR(exynos_gem_obj);
 276
 277         ret = exynos_drm_gem_handle_create(&exynos_gem_obj->base, file_priv,
 278                         &args->handle);
 279         if (ret) {
 280                 exynos_drm_gem_destroy(exynos_gem_obj);
 281                 return ret;
 282         }
 283
 284         return 0;
 285 }
 286
 287 dma_addr_t *exynos_drm_gem_get_dma_addr(struct drm_device *dev,
 288                                         unsigned int gem_handle,
 289                                         struct drm_file *filp)
 290 {
 291         struct exynos_drm_gem_obj *exynos_gem_obj;
 292         struct drm_gem_object *obj;
 293
 294         obj = drm_gem_object_lookup(dev, filp, gem_handle);
 295         if (!obj) {
 296                 DRM_ERROR("failed to lookup gem object.\n");
 297                 return ERR_PTR(-EINVAL);
 298         }
 299
 300         exynos_gem_obj = to_exynos_gem_obj(obj);
 301
 302         return &exynos_gem_obj->buffer->dma_addr;
 303 }
 304
 305 void exynos_drm_gem_put_dma_addr(struct drm_device *dev,
 306                                         unsigned int gem_handle,
 307                                         struct drm_file *filp)
 308 {
 309         struct exynos_drm_gem_obj *exynos_gem_obj;
 310         struct drm_gem_object *obj;
 311
 312         obj = drm_gem_object_lookup(dev, filp, gem_handle);
 313         if (!obj) {
 314                 DRM_ERROR("failed to lookup gem object.\n");
 315                 return;
 316         }
 317
 318         exynos_gem_obj = to_exynos_gem_obj(obj);
 319
 320         drm_gem_object_unreference_unlocked(obj);
 321
 322         /*
 323          * decrease obj->refcount one more time because we has already
 324          * increased it at exynos_drm_gem_get_dma_addr().
 325          */
 326         drm_gem_object_unreference_unlocked(obj);
 327 }
 328
 329 int exynos_drm_gem_map_offset_ioctl(struct drm_device *dev, void *data,
 330                                     struct drm_file *file_priv)
 331 {
 332         struct drm_exynos_gem_map_off *args = data;
 333
 334         DRM_DEBUG_KMS("%s\n", __FILE__);
 335
 336         DRM_DEBUG_KMS("handle = 0x%x, offset = 0x%lx\n",
 337                         args->handle, (unsigned long)args->offset);
 338
 339         if (!(dev->driver->driver_features & DRIVER_GEM)) {
 340                 DRM_ERROR("does not support GEM.\n");
 341                 return -ENODEV;
 342         }
 343
 344         return exynos_drm_gem_dumb_map_offset(file_priv, dev, args->handle,
 345                         &args->offset);
 346 }
 347
 348 static struct drm_file *exynos_drm_find_drm_file(struct drm_device *drm_dev,
 349                                                         struct file *filp)
 350 {
 351         struct drm_file *file_priv;
 352
 353         /* find current process's drm_file from filelist. */
 354         list_for_each_entry(file_priv, &drm_dev->filelist, lhead)
 355                 if (file_priv->filp == filp)
 356                         return file_priv;
 357
 358         WARN_ON(1);
 359
 360         return ERR_PTR(-EFAULT);
 361 }
 362
 363 static int exynos_drm_gem_mmap_buffer(struct file *filp,
 364                                       struct vm_area_struct *vma)
 365 {
 366         struct drm_gem_object *obj = filp->private_data;
 367         struct exynos_drm_gem_obj *exynos_gem_obj = to_exynos_gem_obj(obj);
 368         struct drm_device *drm_dev = obj->dev;
 369         struct exynos_drm_gem_buf *buffer;
 370         struct drm_file *file_priv;
 371         unsigned long vm_size;
 372         int ret;
 373
 374         DRM_DEBUG_KMS("%s\n", __FILE__);
 375
 376         vma->vm_flags |= VM_IO | VM_DONTEXPAND | VM_DONTDUMP;
 377         vma->vm_private_data = obj;
 378         vma->vm_ops = drm_dev->driver->gem_vm_ops;
 379
 380         /* restore it to driver's fops. */
 381         filp->f_op = fops_get(drm_dev->driver->fops);
 382
 383         file_priv = exynos_drm_find_drm_file(drm_dev, filp);
 384         if (IS_ERR(file_priv))
 385                 return PTR_ERR(file_priv);
 386
 387         /* restore it to drm_file. */
 388         filp->private_data = file_priv;
 389
 390         update_vm_cache_attr(exynos_gem_obj, vma);
 391
 392         vm_size = vma->vm_end - vma->vm_start;
 393
 394         /*
 395          * a buffer contains information to physically continuous memory
 396          * allocated by user request or at framebuffer creation.
 397          */
 398         buffer = exynos_gem_obj->buffer;
 399
 400         /* check if user-requested size is valid. */
 401         if (vm_size > buffer->size)
 402                 return -EINVAL;
 403
 404         ret = dma_mmap_attrs(drm_dev->dev, vma, buffer->pages,
 405                                 buffer->dma_addr, buffer->size,
 406                                 &buffer->dma_attrs);
 407         if (ret < 0) {
 408                 DRM_ERROR("failed to mmap.\n");
 409                 return ret;
 410         }
 411
 412         /*
 413          * take a reference to this mapping of the object. And this reference
 414          * is unreferenced by the corresponding vm_close call.
 415          */
 416         drm_gem_object_reference(obj);
 417
 418         drm_vm_open_locked(drm_dev, vma);
 419
 420         return 0;
 421 }
 422
 423 static const struct file_operations exynos_drm_gem_fops = {
 424         .mmap = exynos_drm_gem_mmap_buffer,
 425 };
 426
 427 int exynos_drm_gem_mmap_ioctl(struct drm_device *dev, void *data,
 428                               struct drm_file *file_priv)
 429 {
 430         struct drm_exynos_gem_mmap *args = data;
 431         struct drm_gem_object *obj;
 432         unsigned int addr;
 433
 434         DRM_DEBUG_KMS("%s\n", __FILE__);
 435
 436         if (!(dev->driver->driver_features & DRIVER_GEM)) {
 437                 DRM_ERROR("does not support GEM.\n");
 438                 return -ENODEV;
 439         }
 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                 return -EINVAL;
 445         }
 446
 447         /*
 448          * We have to use gem object and its fops for specific mmaper,
 449          * but vm_mmap() can deliver only filp. So we have to change
 450          * filp->f_op and filp->private_data temporarily, then restore
 451          * again. So it is important to keep lock until restoration the
 452          * settings to prevent others from misuse of filp->f_op or
 453          * filp->private_data.
 454          */
 455         mutex_lock(&dev->struct_mutex);
 456
 457         /*
 458          * Set specific mmper's fops. And it will be restored by
 459          * exynos_drm_gem_mmap_buffer to dev->driver->fops.
 460          * This is used to call specific mapper temporarily.
 461          */
 462         file_priv->filp->f_op = &exynos_drm_gem_fops;
 463
 464         /*
 465          * Set gem object to private_data so that specific mmaper
 466          * can get the gem object. And it will be restored by
 467          * exynos_drm_gem_mmap_buffer to drm_file.
 468          */
 469         file_priv->filp->private_data = obj;
 470
 471         addr = vm_mmap(file_priv->filp, 0, args->size,
 472                         PROT_READ | PROT_WRITE, MAP_SHARED, 0);
 473
 474         drm_gem_object_unreference(obj);
 475
 476         if (IS_ERR((void *)addr)) {
 477                 /* check filp->f_op, filp->private_data are restored */
 478                 if (file_priv->filp->f_op == &exynos_drm_gem_fops) {
 479                         file_priv->filp->f_op = fops_get(dev->driver->fops);
 480                         file_priv->filp->private_data = file_priv;
 481                 }
 482                 mutex_unlock(&dev->struct_mutex);
 483                 return PTR_ERR((void *)addr);
 484         }
 485
 486         mutex_unlock(&dev->struct_mutex);
 487
 488         args->mapped = addr;
 489
 490         DRM_DEBUG_KMS("mapped = 0x%lx\n", (unsigned long)args->mapped);
 491
 492         return 0;
 493 }
 494
 495 int exynos_drm_gem_get_ioctl(struct drm_device *dev, void *data,
 496                                       struct drm_file *file_priv)
 497 {       struct exynos_drm_gem_obj *exynos_gem_obj;
 498         struct drm_exynos_gem_info *args = data;
 499         struct drm_gem_object *obj;
 500
 501         mutex_lock(&dev->struct_mutex);
 502
 503         obj = drm_gem_object_lookup(dev, file_priv, args->handle);
 504         if (!obj) {
 505                 DRM_ERROR("failed to lookup gem object.\n");
 506                 mutex_unlock(&dev->struct_mutex);
 507                 return -EINVAL;
 508         }
 509
 510         exynos_gem_obj = to_exynos_gem_obj(obj);
 511
 512         args->flags = exynos_gem_obj->flags;
 513         args->size = exynos_gem_obj->size;
 514
 515         drm_gem_object_unreference(obj);
 516         mutex_unlock(&dev->struct_mutex);
 517
 518         return 0;
 519 }
 520
 521 struct vm_area_struct *exynos_gem_get_vma(struct vm_area_struct *vma)
 522 {
 523         struct vm_area_struct *vma_copy;
 524
 525         vma_copy = kmalloc(sizeof(*vma_copy), GFP_KERNEL);
 526         if (!vma_copy)
 527                 return NULL;
 528
 529         if (vma->vm_ops && vma->vm_ops->open)
 530                 vma->vm_ops->open(vma);
 531
 532         if (vma->vm_file)
 533                 get_file(vma->vm_file);
 534
 535         memcpy(vma_copy, vma, sizeof(*vma));
 536
 537         vma_copy->vm_mm = NULL;
 538         vma_copy->vm_next = NULL;
 539         vma_copy->vm_prev = NULL;
 540
 541         return vma_copy;
 542 }
 543
 544 void exynos_gem_put_vma(struct vm_area_struct *vma)
 545 {
 546         if (!vma)
 547                 return;
 548
 549         if (vma->vm_ops && vma->vm_ops->close)
 550                 vma->vm_ops->close(vma);
 551
 552         if (vma->vm_file)
 553                 fput(vma->vm_file);
 554
 555         kfree(vma);
 556 }
 557
 558 int exynos_gem_get_pages_from_userptr(unsigned long start,
 559                                                 unsigned int npages,
 560                                                 struct page **pages,
 561                                                 struct vm_area_struct *vma)
 562 {
 563         int get_npages;
 564
 565         /* the memory region mmaped with VM_PFNMAP. */
 566         if (vma_is_io(vma)) {
 567                 unsigned int i;
 568
 569                 for (i = 0; i < npages; ++i, start += PAGE_SIZE) {
 570                         unsigned long pfn;
 571                         int ret = follow_pfn(vma, start, &pfn);
 572                         if (ret)
 573                                 return ret;
 574
 575                         pages[i] = pfn_to_page(pfn);
 576                 }
 577
 578                 if (i != npages) {
 579                         DRM_ERROR("failed to get user_pages.\n");
 580                         return -EINVAL;
 581                 }
 582
 583                 return 0;
 584         }
 585
 586         get_npages = get_user_pages(current, current->mm, start,
 587                                         npages, 1, 1, pages, NULL);
 588         get_npages = max(get_npages, 0);
 589         if (get_npages != npages) {
 590                 DRM_ERROR("failed to get user_pages.\n");
 591                 while (get_npages)
 592                         put_page(pages[--get_npages]);
 593                 return -EFAULT;
 594         }
 595
 596         return 0;
 597 }
 598
 599 void exynos_gem_put_pages_to_userptr(struct page **pages,
 600                                         unsigned int npages,
 601                                         struct vm_area_struct *vma)
 602 {
 603         if (!vma_is_io(vma)) {
 604                 unsigned int i;
 605
 606                 for (i = 0; i < npages; i++) {
 607                         set_page_dirty_lock(pages[i]);
 608
 609                         /*
 610                          * undo the reference we took when populating
 611                          * the table.
 612                          */
 613                         put_page(pages[i]);
 614                 }
 615         }
 616 }
 617
 618 int exynos_gem_map_sgt_with_dma(struct drm_device *drm_dev,
 619                                 struct sg_table *sgt,
 620                                 enum dma_data_direction dir)
 621 {
 622         int nents;
 623
 624         mutex_lock(&drm_dev->struct_mutex);
 625
 626         nents = dma_map_sg(drm_dev->dev, sgt->sgl, sgt->nents, dir);
 627         if (!nents) {
 628                 DRM_ERROR("failed to map sgl with dma.\n");
 629                 mutex_unlock(&drm_dev->struct_mutex);
 630                 return nents;
 631         }
 632
 633         mutex_unlock(&drm_dev->struct_mutex);
 634         return 0;
 635 }
 636
 637 void exynos_gem_unmap_sgt_from_dma(struct drm_device *drm_dev,
 638                                 struct sg_table *sgt,
 639                                 enum dma_data_direction dir)
 640 {
 641         dma_unmap_sg(drm_dev->dev, sgt->sgl, sgt->nents, dir);
 642 }
 643
 644 int exynos_drm_gem_init_object(struct drm_gem_object *obj)
 645 {
 646         DRM_DEBUG_KMS("%s\n", __FILE__);
 647
 648         return 0;
 649 }
 650
 651 void exynos_drm_gem_free_object(struct drm_gem_object *obj)
 652 {
 653         struct exynos_drm_gem_obj *exynos_gem_obj;
 654         struct exynos_drm_gem_buf *buf;
 655
 656         DRM_DEBUG_KMS("%s\n", __FILE__);
 657
 658         exynos_gem_obj = to_exynos_gem_obj(obj);
 659         buf = exynos_gem_obj->buffer;
 660
 661         if (obj->import_attach)
 662                 drm_prime_gem_destroy(obj, buf->sgt);
 663
 664         exynos_drm_gem_destroy(to_exynos_gem_obj(obj));
 665 }
 666
 667 int exynos_drm_gem_dumb_create(struct drm_file *file_priv,
 668                                struct drm_device *dev,
 669                                struct drm_mode_create_dumb *args)
 670 {
 671         struct exynos_drm_gem_obj *exynos_gem_obj;
 672         int ret;
 673
 674         DRM_DEBUG_KMS("%s\n", __FILE__);
 675
 676         /*
 677          * alocate memory to be used for framebuffer.
 678          * - this callback would be called by user application
 679          *      with DRM_IOCTL_MODE_CREATE_DUMB command.
 680          */
 681
 682         args->pitch = args->width * ((args->bpp + 7) / 8);
 683         args->size = args->pitch * args->height;
 684
 685         exynos_gem_obj = exynos_drm_gem_create(dev, EXYNOS_BO_CONTIG |
 686                                                 EXYNOS_BO_WC, args->size);
 687         if (IS_ERR(exynos_gem_obj))
 688                 return PTR_ERR(exynos_gem_obj);
 689
 690         ret = exynos_drm_gem_handle_create(&exynos_gem_obj->base, file_priv,
 691                         &args->handle);
 692         if (ret) {
 693                 exynos_drm_gem_destroy(exynos_gem_obj);
 694                 return ret;
 695         }
 696
 697         return 0;
 698 }
 699
 700 int exynos_drm_gem_dumb_map_offset(struct drm_file *file_priv,
 701                                    struct drm_device *dev, uint32_t handle,
 702                                    uint64_t *offset)
 703 {
 704         struct drm_gem_object *obj;
 705         int ret = 0;
 706
 707         DRM_DEBUG_KMS("%s\n", __FILE__);
 708
 709         mutex_lock(&dev->struct_mutex);
 710
 711         /*
 712          * get offset of memory allocated for drm framebuffer.
 713          * - this callback would be called by user application
 714          *      with DRM_IOCTL_MODE_MAP_DUMB command.
 715          */
 716
 717         obj = drm_gem_object_lookup(dev, file_priv, handle);
 718         if (!obj) {
 719                 DRM_ERROR("failed to lookup gem object.\n");
 720                 ret = -EINVAL;
 721                 goto unlock;
 722         }
 723
 724         if (!obj->map_list.map) {
 725                 ret = drm_gem_create_mmap_offset(obj);
 726                 if (ret)
 727                         goto out;
 728         }
 729
 730         *offset = (u64)obj->map_list.hash.key << PAGE_SHIFT;
 731         DRM_DEBUG_KMS("offset = 0x%lx\n", (unsigned long)*offset);
 732
 733 out:
 734         drm_gem_object_unreference(obj);
 735 unlock:
 736         mutex_unlock(&dev->struct_mutex);
 737         return ret;
 738 }
 739
 740 int exynos_drm_gem_dumb_destroy(struct drm_file *file_priv,
 741                                 struct drm_device *dev,
 742                                 unsigned int handle)
 743 {
 744         int ret;
 745
 746         DRM_DEBUG_KMS("%s\n", __FILE__);
 747
 748         /*
 749          * obj->refcount and obj->handle_count are decreased and
 750          * if both them are 0 then exynos_drm_gem_free_object()
 751          * would be called by callback to release resources.
 752          */
 753         ret = drm_gem_handle_delete(file_priv, handle);
 754         if (ret < 0) {
 755                 DRM_ERROR("failed to delete drm_gem_handle.\n");
 756                 return ret;
 757         }
 758
 759         return 0;
 760 }
 761
 762 int exynos_drm_gem_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
 763 {
 764         struct drm_gem_object *obj = vma->vm_private_data;
 765         struct drm_device *dev = obj->dev;
 766         unsigned long f_vaddr;
 767         pgoff_t page_offset;
 768         int ret;
 769
 770         page_offset = ((unsigned long)vmf->virtual_address -
 771                         vma->vm_start) >> PAGE_SHIFT;
 772         f_vaddr = (unsigned long)vmf->virtual_address;
 773
 774         mutex_lock(&dev->struct_mutex);
 775
 776         ret = exynos_drm_gem_map_buf(obj, vma, f_vaddr, page_offset);
 777         if (ret < 0)
 778                 DRM_ERROR("failed to map a buffer with user.\n");
 779
 780         mutex_unlock(&dev->struct_mutex);
 781
 782         return convert_to_vm_err_msg(ret);
 783 }
 784
 785 int exynos_drm_gem_mmap(struct file *filp, struct vm_area_struct *vma)
 786 {
 787         struct exynos_drm_gem_obj *exynos_gem_obj;
 788         struct drm_gem_object *obj;
 789         int ret;
 790
 791         DRM_DEBUG_KMS("%s\n", __FILE__);
 792
 793         /* set vm_area_struct. */
 794         ret = drm_gem_mmap(filp, vma);
 795         if (ret < 0) {
 796                 DRM_ERROR("failed to mmap.\n");
 797                 return ret;
 798         }
 799
 800         obj = vma->vm_private_data;
 801         exynos_gem_obj = to_exynos_gem_obj(obj);
 802
 803         ret = check_gem_flags(exynos_gem_obj->flags);
 804         if (ret) {
 805                 drm_gem_vm_close(vma);
 806                 drm_gem_free_mmap_offset(obj);
 807                 return ret;
 808         }
 809
 810         vma->vm_flags &= ~VM_PFNMAP;
 811         vma->vm_flags |= VM_MIXEDMAP;
 812
 813         update_vm_cache_attr(exynos_gem_obj, vma);
 814
 815         return ret;
 816 }