1 /* exynos_drm_gem.c 2 * 3 * Copyright (c) 2011 Samsung Electronics Co., Ltd. 4 * Author: Inki Dae <inki.dae@samsung.com> 5 * 6 * This program is free software; you can redistribute it and/or modify it 7 * under the terms of the GNU General Public License as published by the 8 * Free Software Foundation; either version 2 of the License, or (at your 9 * option) any later version. 10 */ 11 12 #include <drm/drmP.h> 13 14 #include <linux/shmem_fs.h> 15 #include <drm/exynos_drm.h> 16 17 #include "exynos_drm_drv.h" 18 #include "exynos_drm_gem.h" 19 #include "exynos_drm_buf.h" 20 21 static unsigned int convert_to_vm_err_msg(int msg) 22 { 23 unsigned int out_msg; 24 25 switch (msg) { 26 case 0: 27 case -ERESTARTSYS: 28 case -EINTR: 29 out_msg = VM_FAULT_NOPAGE; 30 break; 31 32 case -ENOMEM: 33 out_msg = VM_FAULT_OOM; 34 break; 35 36 default: 37 out_msg = VM_FAULT_SIGBUS; 38 break; 39 } 40 41 return out_msg; 42 } 43 44 static int check_gem_flags(unsigned int flags) 45 { 46 if (flags & ~(EXYNOS_BO_MASK)) { 47 DRM_ERROR("invalid flags.\n"); 48 return -EINVAL; 49 } 50 51 return 0; 52 } 53 54 static void update_vm_cache_attr(struct exynos_drm_gem_obj *obj, 55 struct vm_area_struct *vma) 56 { 57 DRM_DEBUG_KMS("flags = 0x%x\n", obj->flags); 58 59 /* non-cachable as default. */ 60 if (obj->flags & EXYNOS_BO_CACHABLE) 61 vma->vm_page_prot = vm_get_page_prot(vma->vm_flags); 62 else if (obj->flags & EXYNOS_BO_WC) 63 vma->vm_page_prot = 64 pgprot_writecombine(vm_get_page_prot(vma->vm_flags)); 65 else 66 vma->vm_page_prot = 67 pgprot_noncached(vm_get_page_prot(vma->vm_flags)); 68 } 69 70 static unsigned long roundup_gem_size(unsigned long size, unsigned int flags) 71 { 72 /* TODO */ 73 74 return roundup(size, PAGE_SIZE); 75 } 76 77 static int exynos_drm_gem_map_buf(struct drm_gem_object *obj, 78 struct vm_area_struct *vma, 79 unsigned long f_vaddr, 80 pgoff_t page_offset) 81 { 82 struct exynos_drm_gem_obj *exynos_gem_obj = to_exynos_gem_obj(obj); 83 struct exynos_drm_gem_buf *buf = exynos_gem_obj->buffer; 84 struct scatterlist *sgl; 85 unsigned long pfn; 86 int i; 87 88 if (!buf->sgt) 89 return -EINTR; 90 91 if (page_offset >= (buf->size >> PAGE_SHIFT)) { 92 DRM_ERROR("invalid page offset\n"); 93 return -EINVAL; 94 } 95 96 sgl = buf->sgt->sgl; 97 for_each_sg(buf->sgt->sgl, sgl, buf->sgt->nents, i) { 98 if (page_offset < (sgl->length >> PAGE_SHIFT)) 99 break; 100 page_offset -= (sgl->length >> PAGE_SHIFT); 101 } 102 103 pfn = __phys_to_pfn(sg_phys(sgl)) + page_offset; 104 105 return vm_insert_mixed(vma, f_vaddr, pfn); 106 } 107 108 static int exynos_drm_gem_handle_create(struct drm_gem_object *obj, 109 struct drm_file *file_priv, 110 unsigned int *handle) 111 { 112 int ret; 113 114 /* 115 * allocate a id of idr table where the obj is registered 116 * and handle has the id what user can see. 117 */ 118 ret = drm_gem_handle_create(file_priv, obj, handle); 119 if (ret) 120 return ret; 121 122 DRM_DEBUG_KMS("gem handle = 0x%x\n", *handle); 123 124 /* drop reference from allocate - handle holds it now. */ 125 drm_gem_object_unreference_unlocked(obj); 126 127 return 0; 128 } 129 130 void exynos_drm_gem_destroy(struct exynos_drm_gem_obj *exynos_gem_obj) 131 { 132 struct drm_gem_object *obj; 133 struct exynos_drm_gem_buf *buf; 134 135 DRM_DEBUG_KMS("%s\n", __FILE__); 136 137 obj = &exynos_gem_obj->base; 138 buf = exynos_gem_obj->buffer; 139 140 DRM_DEBUG_KMS("handle count = %d\n", atomic_read(&obj->handle_count)); 141 142 /* 143 * do not release memory region from exporter. 144 * 145 * the region will be released by exporter 146 * once dmabuf's refcount becomes 0. 147 */ 148 if (obj->import_attach) 149 goto out; 150 151 exynos_drm_free_buf(obj->dev, exynos_gem_obj->flags, buf); 152 153 out: 154 exynos_drm_fini_buf(obj->dev, buf); 155 exynos_gem_obj->buffer = NULL; 156 157 if (obj->map_list.map) 158 drm_gem_free_mmap_offset(obj); 159 160 /* release file pointer to gem object. */ 161 drm_gem_object_release(obj); 162 163 kfree(exynos_gem_obj); 164 exynos_gem_obj = NULL; 165 } 166 167 struct exynos_drm_gem_obj *exynos_drm_gem_init(struct drm_device *dev, 168 unsigned long size) 169 { 170 struct exynos_drm_gem_obj *exynos_gem_obj; 171 struct drm_gem_object *obj; 172 int ret; 173 174 exynos_gem_obj = kzalloc(sizeof(*exynos_gem_obj), GFP_KERNEL); 175 if (!exynos_gem_obj) { 176 DRM_ERROR("failed to allocate exynos gem object\n"); 177 return NULL; 178 } 179 180 exynos_gem_obj->size = size; 181 obj = &exynos_gem_obj->base; 182 183 ret = drm_gem_object_init(dev, obj, size); 184 if (ret < 0) { 185 DRM_ERROR("failed to initialize gem object\n"); 186 kfree(exynos_gem_obj); 187 return NULL; 188 } 189 190 DRM_DEBUG_KMS("created file object = 0x%x\n", (unsigned int)obj->filp); 191 192 return exynos_gem_obj; 193 } 194 195 struct exynos_drm_gem_obj *exynos_drm_gem_create(struct drm_device *dev, 196 unsigned int flags, 197 unsigned long size) 198 { 199 struct exynos_drm_gem_obj *exynos_gem_obj; 200 struct exynos_drm_gem_buf *buf; 201 int ret; 202 203 if (!size) { 204 DRM_ERROR("invalid size.\n"); 205 return ERR_PTR(-EINVAL); 206 } 207 208 size = roundup_gem_size(size, flags); 209 DRM_DEBUG_KMS("%s\n", __FILE__); 210 211 ret = check_gem_flags(flags); 212 if (ret) 213 return ERR_PTR(ret); 214 215 buf = exynos_drm_init_buf(dev, size); 216 if (!buf) 217 return ERR_PTR(-ENOMEM); 218 219 exynos_gem_obj = exynos_drm_gem_init(dev, size); 220 if (!exynos_gem_obj) { 221 ret = -ENOMEM; 222 goto err_fini_buf; 223 } 224 225 exynos_gem_obj->buffer = buf; 226 227 /* set memory type and cache attribute from user side. */ 228 exynos_gem_obj->flags = flags; 229 230 ret = exynos_drm_alloc_buf(dev, buf, flags); 231 if (ret < 0) { 232 drm_gem_object_release(&exynos_gem_obj->base); 233 goto err_fini_buf; 234 } 235 236 return exynos_gem_obj; 237 238 err_fini_buf: 239 exynos_drm_fini_buf(dev, buf); 240 return ERR_PTR(ret); 241 } 242 243 int exynos_drm_gem_create_ioctl(struct drm_device *dev, void *data, 244 struct drm_file *file_priv) 245 { 246 struct drm_exynos_gem_create *args = data; 247 struct exynos_drm_gem_obj *exynos_gem_obj; 248 int ret; 249 250 DRM_DEBUG_KMS("%s\n", __FILE__); 251 252 exynos_gem_obj = exynos_drm_gem_create(dev, args->flags, args->size); 253 if (IS_ERR(exynos_gem_obj)) 254 return PTR_ERR(exynos_gem_obj); 255 256 ret = exynos_drm_gem_handle_create(&exynos_gem_obj->base, file_priv, 257 &args->handle); 258 if (ret) { 259 exynos_drm_gem_destroy(exynos_gem_obj); 260 return ret; 261 } 262 263 return 0; 264 } 265 266 dma_addr_t *exynos_drm_gem_get_dma_addr(struct drm_device *dev, 267 unsigned int gem_handle, 268 struct drm_file *filp) 269 { 270 struct exynos_drm_gem_obj *exynos_gem_obj; 271 struct drm_gem_object *obj; 272 273 obj = drm_gem_object_lookup(dev, filp, gem_handle); 274 if (!obj) { 275 DRM_ERROR("failed to lookup gem object.\n"); 276 return ERR_PTR(-EINVAL); 277 } 278 279 exynos_gem_obj = to_exynos_gem_obj(obj); 280 281 return &exynos_gem_obj->buffer->dma_addr; 282 } 283 284 void exynos_drm_gem_put_dma_addr(struct drm_device *dev, 285 unsigned int gem_handle, 286 struct drm_file *filp) 287 { 288 struct exynos_drm_gem_obj *exynos_gem_obj; 289 struct drm_gem_object *obj; 290 291 obj = drm_gem_object_lookup(dev, filp, gem_handle); 292 if (!obj) { 293 DRM_ERROR("failed to lookup gem object.\n"); 294 return; 295 } 296 297 exynos_gem_obj = to_exynos_gem_obj(obj); 298 299 drm_gem_object_unreference_unlocked(obj); 300 301 /* 302 * decrease obj->refcount one more time because we has already 303 * increased it at exynos_drm_gem_get_dma_addr(). 304 */ 305 drm_gem_object_unreference_unlocked(obj); 306 } 307 308 int exynos_drm_gem_map_offset_ioctl(struct drm_device *dev, void *data, 309 struct drm_file *file_priv) 310 { 311 struct drm_exynos_gem_map_off *args = data; 312 313 DRM_DEBUG_KMS("%s\n", __FILE__); 314 315 DRM_DEBUG_KMS("handle = 0x%x, offset = 0x%lx\n", 316 args->handle, (unsigned long)args->offset); 317 318 if (!(dev->driver->driver_features & DRIVER_GEM)) { 319 DRM_ERROR("does not support GEM.\n"); 320 return -ENODEV; 321 } 322 323 return exynos_drm_gem_dumb_map_offset(file_priv, dev, args->handle, 324 &args->offset); 325 } 326 327 static struct drm_file *exynos_drm_find_drm_file(struct drm_device *drm_dev, 328 struct file *filp) 329 { 330 struct drm_file *file_priv; 331 332 mutex_lock(&drm_dev->struct_mutex); 333 334 /* find current process's drm_file from filelist. */ 335 list_for_each_entry(file_priv, &drm_dev->filelist, lhead) { 336 if (file_priv->filp == filp) { 337 mutex_unlock(&drm_dev->struct_mutex); 338 return file_priv; 339 } 340 } 341 342 mutex_unlock(&drm_dev->struct_mutex); 343 WARN_ON(1); 344 345 return ERR_PTR(-EFAULT); 346 } 347 348 static int exynos_drm_gem_mmap_buffer(struct file *filp, 349 struct vm_area_struct *vma) 350 { 351 struct drm_gem_object *obj = filp->private_data; 352 struct exynos_drm_gem_obj *exynos_gem_obj = to_exynos_gem_obj(obj); 353 struct drm_device *drm_dev = obj->dev; 354 struct exynos_drm_gem_buf *buffer; 355 struct drm_file *file_priv; 356 unsigned long vm_size; 357 int ret; 358 359 DRM_DEBUG_KMS("%s\n", __FILE__); 360 361 vma->vm_flags |= VM_IO | VM_DONTEXPAND | VM_DONTDUMP; 362 vma->vm_private_data = obj; 363 vma->vm_ops = drm_dev->driver->gem_vm_ops; 364 365 /* restore it to driver's fops. */ 366 filp->f_op = fops_get(drm_dev->driver->fops); 367 368 file_priv = exynos_drm_find_drm_file(drm_dev, filp); 369 if (IS_ERR(file_priv)) 370 return PTR_ERR(file_priv); 371 372 /* restore it to drm_file. */ 373 filp->private_data = file_priv; 374 375 update_vm_cache_attr(exynos_gem_obj, vma); 376 377 vm_size = vma->vm_end - vma->vm_start; 378 379 /* 380 * a buffer contains information to physically continuous memory 381 * allocated by user request or at framebuffer creation. 382 */ 383 buffer = exynos_gem_obj->buffer; 384 385 /* check if user-requested size is valid. */ 386 if (vm_size > buffer->size) 387 return -EINVAL; 388 389 ret = dma_mmap_attrs(drm_dev->dev, vma, buffer->pages, 390 buffer->dma_addr, buffer->size, 391 &buffer->dma_attrs); 392 if (ret < 0) { 393 DRM_ERROR("failed to mmap.\n"); 394 return ret; 395 } 396 397 /* 398 * take a reference to this mapping of the object. And this reference 399 * is unreferenced by the corresponding vm_close call. 400 */ 401 drm_gem_object_reference(obj); 402 403 mutex_lock(&drm_dev->struct_mutex); 404 drm_vm_open_locked(drm_dev, vma); 405 mutex_unlock(&drm_dev->struct_mutex); 406 407 return 0; 408 } 409 410 static const struct file_operations exynos_drm_gem_fops = { 411 .mmap = exynos_drm_gem_mmap_buffer, 412 }; 413 414 int exynos_drm_gem_mmap_ioctl(struct drm_device *dev, void *data, 415 struct drm_file *file_priv) 416 { 417 struct drm_exynos_gem_mmap *args = data; 418 struct drm_gem_object *obj; 419 unsigned int addr; 420 421 DRM_DEBUG_KMS("%s\n", __FILE__); 422 423 if (!(dev->driver->driver_features & DRIVER_GEM)) { 424 DRM_ERROR("does not support GEM.\n"); 425 return -ENODEV; 426 } 427 428 obj = drm_gem_object_lookup(dev, file_priv, args->handle); 429 if (!obj) { 430 DRM_ERROR("failed to lookup gem object.\n"); 431 return -EINVAL; 432 } 433 434 /* 435 * Set specific mmper's fops. And it will be restored by 436 * exynos_drm_gem_mmap_buffer to dev->driver->fops. 437 * This is used to call specific mapper temporarily. 438 */ 439 file_priv->filp->f_op = &exynos_drm_gem_fops; 440 441 /* 442 * Set gem object to private_data so that specific mmaper 443 * can get the gem object. And it will be restored by 444 * exynos_drm_gem_mmap_buffer to drm_file. 445 */ 446 file_priv->filp->private_data = obj; 447 448 addr = vm_mmap(file_priv->filp, 0, args->size, 449 PROT_READ | PROT_WRITE, MAP_SHARED, 0); 450 451 drm_gem_object_unreference_unlocked(obj); 452 453 if (IS_ERR((void *)addr)) { 454 file_priv->filp->private_data = file_priv; 455 return PTR_ERR((void *)addr); 456 } 457 458 args->mapped = addr; 459 460 DRM_DEBUG_KMS("mapped = 0x%lx\n", (unsigned long)args->mapped); 461 462 return 0; 463 } 464 465 int exynos_drm_gem_get_ioctl(struct drm_device *dev, void *data, 466 struct drm_file *file_priv) 467 { struct exynos_drm_gem_obj *exynos_gem_obj; 468 struct drm_exynos_gem_info *args = data; 469 struct drm_gem_object *obj; 470 471 mutex_lock(&dev->struct_mutex); 472 473 obj = drm_gem_object_lookup(dev, file_priv, args->handle); 474 if (!obj) { 475 DRM_ERROR("failed to lookup gem object.\n"); 476 mutex_unlock(&dev->struct_mutex); 477 return -EINVAL; 478 } 479 480 exynos_gem_obj = to_exynos_gem_obj(obj); 481 482 args->flags = exynos_gem_obj->flags; 483 args->size = exynos_gem_obj->size; 484 485 drm_gem_object_unreference(obj); 486 mutex_unlock(&dev->struct_mutex); 487 488 return 0; 489 } 490 491 struct vm_area_struct *exynos_gem_get_vma(struct vm_area_struct *vma) 492 { 493 struct vm_area_struct *vma_copy; 494 495 vma_copy = kmalloc(sizeof(*vma_copy), GFP_KERNEL); 496 if (!vma_copy) 497 return NULL; 498 499 if (vma->vm_ops && vma->vm_ops->open) 500 vma->vm_ops->open(vma); 501 502 if (vma->vm_file) 503 get_file(vma->vm_file); 504 505 memcpy(vma_copy, vma, sizeof(*vma)); 506 507 vma_copy->vm_mm = NULL; 508 vma_copy->vm_next = NULL; 509 vma_copy->vm_prev = NULL; 510 511 return vma_copy; 512 } 513 514 void exynos_gem_put_vma(struct vm_area_struct *vma) 515 { 516 if (!vma) 517 return; 518 519 if (vma->vm_ops && vma->vm_ops->close) 520 vma->vm_ops->close(vma); 521 522 if (vma->vm_file) 523 fput(vma->vm_file); 524 525 kfree(vma); 526 } 527 528 int exynos_gem_get_pages_from_userptr(unsigned long start, 529 unsigned int npages, 530 struct page **pages, 531 struct vm_area_struct *vma) 532 { 533 int get_npages; 534 535 /* the memory region mmaped with VM_PFNMAP. */ 536 if (vma_is_io(vma)) { 537 unsigned int i; 538 539 for (i = 0; i < npages; ++i, start += PAGE_SIZE) { 540 unsigned long pfn; 541 int ret = follow_pfn(vma, start, &pfn); 542 if (ret) 543 return ret; 544 545 pages[i] = pfn_to_page(pfn); 546 } 547 548 if (i != npages) { 549 DRM_ERROR("failed to get user_pages.\n"); 550 return -EINVAL; 551 } 552 553 return 0; 554 } 555 556 get_npages = get_user_pages(current, current->mm, start, 557 npages, 1, 1, pages, NULL); 558 get_npages = max(get_npages, 0); 559 if (get_npages != npages) { 560 DRM_ERROR("failed to get user_pages.\n"); 561 while (get_npages) 562 put_page(pages[--get_npages]); 563 return -EFAULT; 564 } 565 566 return 0; 567 } 568 569 void exynos_gem_put_pages_to_userptr(struct page **pages, 570 unsigned int npages, 571 struct vm_area_struct *vma) 572 { 573 if (!vma_is_io(vma)) { 574 unsigned int i; 575 576 for (i = 0; i < npages; i++) { 577 set_page_dirty_lock(pages[i]); 578 579 /* 580 * undo the reference we took when populating 581 * the table. 582 */ 583 put_page(pages[i]); 584 } 585 } 586 } 587 588 int exynos_gem_map_sgt_with_dma(struct drm_device *drm_dev, 589 struct sg_table *sgt, 590 enum dma_data_direction dir) 591 { 592 int nents; 593 594 mutex_lock(&drm_dev->struct_mutex); 595 596 nents = dma_map_sg(drm_dev->dev, sgt->sgl, sgt->nents, dir); 597 if (!nents) { 598 DRM_ERROR("failed to map sgl with dma.\n"); 599 mutex_unlock(&drm_dev->struct_mutex); 600 return nents; 601 } 602 603 mutex_unlock(&drm_dev->struct_mutex); 604 return 0; 605 } 606 607 void exynos_gem_unmap_sgt_from_dma(struct drm_device *drm_dev, 608 struct sg_table *sgt, 609 enum dma_data_direction dir) 610 { 611 dma_unmap_sg(drm_dev->dev, sgt->sgl, sgt->nents, dir); 612 } 613 614 int exynos_drm_gem_init_object(struct drm_gem_object *obj) 615 { 616 DRM_DEBUG_KMS("%s\n", __FILE__); 617 618 return 0; 619 } 620 621 void exynos_drm_gem_free_object(struct drm_gem_object *obj) 622 { 623 struct exynos_drm_gem_obj *exynos_gem_obj; 624 struct exynos_drm_gem_buf *buf; 625 626 DRM_DEBUG_KMS("%s\n", __FILE__); 627 628 exynos_gem_obj = to_exynos_gem_obj(obj); 629 buf = exynos_gem_obj->buffer; 630 631 if (obj->import_attach) 632 drm_prime_gem_destroy(obj, buf->sgt); 633 634 exynos_drm_gem_destroy(to_exynos_gem_obj(obj)); 635 } 636 637 int exynos_drm_gem_dumb_create(struct drm_file *file_priv, 638 struct drm_device *dev, 639 struct drm_mode_create_dumb *args) 640 { 641 struct exynos_drm_gem_obj *exynos_gem_obj; 642 int ret; 643 644 DRM_DEBUG_KMS("%s\n", __FILE__); 645 646 /* 647 * alocate memory to be used for framebuffer. 648 * - this callback would be called by user application 649 * with DRM_IOCTL_MODE_CREATE_DUMB command. 650 */ 651 652 args->pitch = args->width * ((args->bpp + 7) / 8); 653 args->size = args->pitch * args->height; 654 655 exynos_gem_obj = exynos_drm_gem_create(dev, args->flags, args->size); 656 if (IS_ERR(exynos_gem_obj)) 657 return PTR_ERR(exynos_gem_obj); 658 659 ret = exynos_drm_gem_handle_create(&exynos_gem_obj->base, file_priv, 660 &args->handle); 661 if (ret) { 662 exynos_drm_gem_destroy(exynos_gem_obj); 663 return ret; 664 } 665 666 return 0; 667 } 668 669 int exynos_drm_gem_dumb_map_offset(struct drm_file *file_priv, 670 struct drm_device *dev, uint32_t handle, 671 uint64_t *offset) 672 { 673 struct drm_gem_object *obj; 674 int ret = 0; 675 676 DRM_DEBUG_KMS("%s\n", __FILE__); 677 678 mutex_lock(&dev->struct_mutex); 679 680 /* 681 * get offset of memory allocated for drm framebuffer. 682 * - this callback would be called by user application 683 * with DRM_IOCTL_MODE_MAP_DUMB command. 684 */ 685 686 obj = drm_gem_object_lookup(dev, file_priv, handle); 687 if (!obj) { 688 DRM_ERROR("failed to lookup gem object.\n"); 689 ret = -EINVAL; 690 goto unlock; 691 } 692 693 if (!obj->map_list.map) { 694 ret = drm_gem_create_mmap_offset(obj); 695 if (ret) 696 goto out; 697 } 698 699 *offset = (u64)obj->map_list.hash.key << PAGE_SHIFT; 700 DRM_DEBUG_KMS("offset = 0x%lx\n", (unsigned long)*offset); 701 702 out: 703 drm_gem_object_unreference(obj); 704 unlock: 705 mutex_unlock(&dev->struct_mutex); 706 return ret; 707 } 708 709 int exynos_drm_gem_dumb_destroy(struct drm_file *file_priv, 710 struct drm_device *dev, 711 unsigned int handle) 712 { 713 int ret; 714 715 DRM_DEBUG_KMS("%s\n", __FILE__); 716 717 /* 718 * obj->refcount and obj->handle_count are decreased and 719 * if both them are 0 then exynos_drm_gem_free_object() 720 * would be called by callback to release resources. 721 */ 722 ret = drm_gem_handle_delete(file_priv, handle); 723 if (ret < 0) { 724 DRM_ERROR("failed to delete drm_gem_handle.\n"); 725 return ret; 726 } 727 728 return 0; 729 } 730 731 int exynos_drm_gem_fault(struct vm_area_struct *vma, struct vm_fault *vmf) 732 { 733 struct drm_gem_object *obj = vma->vm_private_data; 734 struct drm_device *dev = obj->dev; 735 unsigned long f_vaddr; 736 pgoff_t page_offset; 737 int ret; 738 739 page_offset = ((unsigned long)vmf->virtual_address - 740 vma->vm_start) >> PAGE_SHIFT; 741 f_vaddr = (unsigned long)vmf->virtual_address; 742 743 mutex_lock(&dev->struct_mutex); 744 745 ret = exynos_drm_gem_map_buf(obj, vma, f_vaddr, page_offset); 746 if (ret < 0) 747 DRM_ERROR("failed to map a buffer with user.\n"); 748 749 mutex_unlock(&dev->struct_mutex); 750 751 return convert_to_vm_err_msg(ret); 752 } 753 754 int exynos_drm_gem_mmap(struct file *filp, struct vm_area_struct *vma) 755 { 756 struct exynos_drm_gem_obj *exynos_gem_obj; 757 struct drm_gem_object *obj; 758 int ret; 759 760 DRM_DEBUG_KMS("%s\n", __FILE__); 761 762 /* set vm_area_struct. */ 763 ret = drm_gem_mmap(filp, vma); 764 if (ret < 0) { 765 DRM_ERROR("failed to mmap.\n"); 766 return ret; 767 } 768 769 obj = vma->vm_private_data; 770 exynos_gem_obj = to_exynos_gem_obj(obj); 771 772 ret = check_gem_flags(exynos_gem_obj->flags); 773 if (ret) { 774 drm_gem_vm_close(vma); 775 drm_gem_free_mmap_offset(obj); 776 return ret; 777 } 778 779 vma->vm_flags &= ~VM_PFNMAP; 780 vma->vm_flags |= VM_MIXEDMAP; 781 782 update_vm_cache_attr(exynos_gem_obj, vma); 783 784 return ret; 785 } 786