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 obj = &exynos_gem_obj->base; 136 buf = exynos_gem_obj->buffer; 137 138 DRM_DEBUG_KMS("handle count = %d\n", atomic_read(&obj->handle_count)); 139 140 /* 141 * do not release memory region from exporter. 142 * 143 * the region will be released by exporter 144 * once dmabuf's refcount becomes 0. 145 */ 146 if (obj->import_attach) 147 goto out; 148 149 exynos_drm_free_buf(obj->dev, exynos_gem_obj->flags, buf); 150 151 out: 152 exynos_drm_fini_buf(obj->dev, buf); 153 exynos_gem_obj->buffer = NULL; 154 155 if (obj->map_list.map) 156 drm_gem_free_mmap_offset(obj); 157 158 /* release file pointer to gem object. */ 159 drm_gem_object_release(obj); 160 161 kfree(exynos_gem_obj); 162 exynos_gem_obj = NULL; 163 } 164 165 unsigned long exynos_drm_gem_get_size(struct drm_device *dev, 166 unsigned int gem_handle, 167 struct drm_file *file_priv) 168 { 169 struct exynos_drm_gem_obj *exynos_gem_obj; 170 struct drm_gem_object *obj; 171 172 obj = drm_gem_object_lookup(dev, file_priv, gem_handle); 173 if (!obj) { 174 DRM_ERROR("failed to lookup gem object.\n"); 175 return 0; 176 } 177 178 exynos_gem_obj = to_exynos_gem_obj(obj); 179 180 drm_gem_object_unreference_unlocked(obj); 181 182 return exynos_gem_obj->buffer->size; 183 } 184 185 186 struct exynos_drm_gem_obj *exynos_drm_gem_init(struct drm_device *dev, 187 unsigned long size) 188 { 189 struct exynos_drm_gem_obj *exynos_gem_obj; 190 struct drm_gem_object *obj; 191 int ret; 192 193 exynos_gem_obj = kzalloc(sizeof(*exynos_gem_obj), GFP_KERNEL); 194 if (!exynos_gem_obj) { 195 DRM_ERROR("failed to allocate exynos gem object\n"); 196 return NULL; 197 } 198 199 exynos_gem_obj->size = size; 200 obj = &exynos_gem_obj->base; 201 202 ret = drm_gem_object_init(dev, obj, size); 203 if (ret < 0) { 204 DRM_ERROR("failed to initialize gem object\n"); 205 kfree(exynos_gem_obj); 206 return NULL; 207 } 208 209 DRM_DEBUG_KMS("created file object = 0x%x\n", (unsigned int)obj->filp); 210 211 return exynos_gem_obj; 212 } 213 214 struct exynos_drm_gem_obj *exynos_drm_gem_create(struct drm_device *dev, 215 unsigned int flags, 216 unsigned long size) 217 { 218 struct exynos_drm_gem_obj *exynos_gem_obj; 219 struct exynos_drm_gem_buf *buf; 220 int ret; 221 222 if (!size) { 223 DRM_ERROR("invalid size.\n"); 224 return ERR_PTR(-EINVAL); 225 } 226 227 size = roundup_gem_size(size, flags); 228 229 ret = check_gem_flags(flags); 230 if (ret) 231 return ERR_PTR(ret); 232 233 buf = exynos_drm_init_buf(dev, size); 234 if (!buf) 235 return ERR_PTR(-ENOMEM); 236 237 exynos_gem_obj = exynos_drm_gem_init(dev, size); 238 if (!exynos_gem_obj) { 239 ret = -ENOMEM; 240 goto err_fini_buf; 241 } 242 243 exynos_gem_obj->buffer = buf; 244 245 /* set memory type and cache attribute from user side. */ 246 exynos_gem_obj->flags = flags; 247 248 ret = exynos_drm_alloc_buf(dev, buf, flags); 249 if (ret < 0) 250 goto err_gem_fini; 251 252 return exynos_gem_obj; 253 254 err_gem_fini: 255 drm_gem_object_release(&exynos_gem_obj->base); 256 kfree(exynos_gem_obj); 257 err_fini_buf: 258 exynos_drm_fini_buf(dev, buf); 259 return ERR_PTR(ret); 260 } 261 262 int exynos_drm_gem_create_ioctl(struct drm_device *dev, void *data, 263 struct drm_file *file_priv) 264 { 265 struct drm_exynos_gem_create *args = data; 266 struct exynos_drm_gem_obj *exynos_gem_obj; 267 int ret; 268 269 exynos_gem_obj = exynos_drm_gem_create(dev, args->flags, args->size); 270 if (IS_ERR(exynos_gem_obj)) 271 return PTR_ERR(exynos_gem_obj); 272 273 ret = exynos_drm_gem_handle_create(&exynos_gem_obj->base, file_priv, 274 &args->handle); 275 if (ret) { 276 exynos_drm_gem_destroy(exynos_gem_obj); 277 return ret; 278 } 279 280 return 0; 281 } 282 283 dma_addr_t *exynos_drm_gem_get_dma_addr(struct drm_device *dev, 284 unsigned int gem_handle, 285 struct drm_file *filp) 286 { 287 struct exynos_drm_gem_obj *exynos_gem_obj; 288 struct drm_gem_object *obj; 289 290 obj = drm_gem_object_lookup(dev, filp, gem_handle); 291 if (!obj) { 292 DRM_ERROR("failed to lookup gem object.\n"); 293 return ERR_PTR(-EINVAL); 294 } 295 296 exynos_gem_obj = to_exynos_gem_obj(obj); 297 298 return &exynos_gem_obj->buffer->dma_addr; 299 } 300 301 void exynos_drm_gem_put_dma_addr(struct drm_device *dev, 302 unsigned int gem_handle, 303 struct drm_file *filp) 304 { 305 struct exynos_drm_gem_obj *exynos_gem_obj; 306 struct drm_gem_object *obj; 307 308 obj = drm_gem_object_lookup(dev, filp, gem_handle); 309 if (!obj) { 310 DRM_ERROR("failed to lookup gem object.\n"); 311 return; 312 } 313 314 exynos_gem_obj = to_exynos_gem_obj(obj); 315 316 drm_gem_object_unreference_unlocked(obj); 317 318 /* 319 * decrease obj->refcount one more time because we has already 320 * increased it at exynos_drm_gem_get_dma_addr(). 321 */ 322 drm_gem_object_unreference_unlocked(obj); 323 } 324 325 int exynos_drm_gem_map_offset_ioctl(struct drm_device *dev, void *data, 326 struct drm_file *file_priv) 327 { 328 struct drm_exynos_gem_map_off *args = data; 329 330 DRM_DEBUG_KMS("handle = 0x%x, offset = 0x%lx\n", 331 args->handle, (unsigned long)args->offset); 332 333 if (!(dev->driver->driver_features & DRIVER_GEM)) { 334 DRM_ERROR("does not support GEM.\n"); 335 return -ENODEV; 336 } 337 338 return exynos_drm_gem_dumb_map_offset(file_priv, dev, args->handle, 339 &args->offset); 340 } 341 342 static struct drm_file *exynos_drm_find_drm_file(struct drm_device *drm_dev, 343 struct file *filp) 344 { 345 struct drm_file *file_priv; 346 347 /* find current process's drm_file from filelist. */ 348 list_for_each_entry(file_priv, &drm_dev->filelist, lhead) 349 if (file_priv->filp == filp) 350 return file_priv; 351 352 WARN_ON(1); 353 354 return ERR_PTR(-EFAULT); 355 } 356 357 static int exynos_drm_gem_mmap_buffer(struct file *filp, 358 struct vm_area_struct *vma) 359 { 360 struct drm_gem_object *obj = filp->private_data; 361 struct exynos_drm_gem_obj *exynos_gem_obj = to_exynos_gem_obj(obj); 362 struct drm_device *drm_dev = obj->dev; 363 struct exynos_drm_gem_buf *buffer; 364 struct drm_file *file_priv; 365 unsigned long vm_size; 366 int ret; 367 368 vma->vm_flags |= VM_IO | VM_DONTEXPAND | VM_DONTDUMP; 369 vma->vm_private_data = obj; 370 vma->vm_ops = drm_dev->driver->gem_vm_ops; 371 372 /* restore it to driver's fops. */ 373 filp->f_op = fops_get(drm_dev->driver->fops); 374 375 file_priv = exynos_drm_find_drm_file(drm_dev, filp); 376 if (IS_ERR(file_priv)) 377 return PTR_ERR(file_priv); 378 379 /* restore it to drm_file. */ 380 filp->private_data = file_priv; 381 382 update_vm_cache_attr(exynos_gem_obj, vma); 383 384 vm_size = vma->vm_end - vma->vm_start; 385 386 /* 387 * a buffer contains information to physically continuous memory 388 * allocated by user request or at framebuffer creation. 389 */ 390 buffer = exynos_gem_obj->buffer; 391 392 /* check if user-requested size is valid. */ 393 if (vm_size > buffer->size) 394 return -EINVAL; 395 396 ret = dma_mmap_attrs(drm_dev->dev, vma, buffer->pages, 397 buffer->dma_addr, buffer->size, 398 &buffer->dma_attrs); 399 if (ret < 0) { 400 DRM_ERROR("failed to mmap.\n"); 401 return ret; 402 } 403 404 /* 405 * take a reference to this mapping of the object. And this reference 406 * is unreferenced by the corresponding vm_close call. 407 */ 408 drm_gem_object_reference(obj); 409 410 drm_vm_open_locked(drm_dev, vma); 411 412 return 0; 413 } 414 415 static const struct file_operations exynos_drm_gem_fops = { 416 .mmap = exynos_drm_gem_mmap_buffer, 417 }; 418 419 int exynos_drm_gem_mmap_ioctl(struct drm_device *dev, void *data, 420 struct drm_file *file_priv) 421 { 422 struct drm_exynos_gem_mmap *args = data; 423 struct drm_gem_object *obj; 424 unsigned long addr; 425 426 if (!(dev->driver->driver_features & DRIVER_GEM)) { 427 DRM_ERROR("does not support GEM.\n"); 428 return -ENODEV; 429 } 430 431 obj = drm_gem_object_lookup(dev, file_priv, args->handle); 432 if (!obj) { 433 DRM_ERROR("failed to lookup gem object.\n"); 434 return -EINVAL; 435 } 436 437 /* 438 * We have to use gem object and its fops for specific mmaper, 439 * but vm_mmap() can deliver only filp. So we have to change 440 * filp->f_op and filp->private_data temporarily, then restore 441 * again. So it is important to keep lock until restoration the 442 * settings to prevent others from misuse of filp->f_op or 443 * filp->private_data. 444 */ 445 mutex_lock(&dev->struct_mutex); 446 447 /* 448 * Set specific mmper's fops. And it will be restored by 449 * exynos_drm_gem_mmap_buffer to dev->driver->fops. 450 * This is used to call specific mapper temporarily. 451 */ 452 file_priv->filp->f_op = &exynos_drm_gem_fops; 453 454 /* 455 * Set gem object to private_data so that specific mmaper 456 * can get the gem object. And it will be restored by 457 * exynos_drm_gem_mmap_buffer to drm_file. 458 */ 459 file_priv->filp->private_data = obj; 460 461 addr = vm_mmap(file_priv->filp, 0, args->size, 462 PROT_READ | PROT_WRITE, MAP_SHARED, 0); 463 464 drm_gem_object_unreference(obj); 465 466 if (IS_ERR_VALUE(addr)) { 467 /* check filp->f_op, filp->private_data are restored */ 468 if (file_priv->filp->f_op == &exynos_drm_gem_fops) { 469 file_priv->filp->f_op = fops_get(dev->driver->fops); 470 file_priv->filp->private_data = file_priv; 471 } 472 mutex_unlock(&dev->struct_mutex); 473 return (int)addr; 474 } 475 476 mutex_unlock(&dev->struct_mutex); 477 478 args->mapped = addr; 479 480 DRM_DEBUG_KMS("mapped = 0x%lx\n", (unsigned long)args->mapped); 481 482 return 0; 483 } 484 485 int exynos_drm_gem_get_ioctl(struct drm_device *dev, void *data, 486 struct drm_file *file_priv) 487 { struct exynos_drm_gem_obj *exynos_gem_obj; 488 struct drm_exynos_gem_info *args = data; 489 struct drm_gem_object *obj; 490 491 mutex_lock(&dev->struct_mutex); 492 493 obj = drm_gem_object_lookup(dev, file_priv, args->handle); 494 if (!obj) { 495 DRM_ERROR("failed to lookup gem object.\n"); 496 mutex_unlock(&dev->struct_mutex); 497 return -EINVAL; 498 } 499 500 exynos_gem_obj = to_exynos_gem_obj(obj); 501 502 args->flags = exynos_gem_obj->flags; 503 args->size = exynos_gem_obj->size; 504 505 drm_gem_object_unreference(obj); 506 mutex_unlock(&dev->struct_mutex); 507 508 return 0; 509 } 510 511 struct vm_area_struct *exynos_gem_get_vma(struct vm_area_struct *vma) 512 { 513 struct vm_area_struct *vma_copy; 514 515 vma_copy = kmalloc(sizeof(*vma_copy), GFP_KERNEL); 516 if (!vma_copy) 517 return NULL; 518 519 if (vma->vm_ops && vma->vm_ops->open) 520 vma->vm_ops->open(vma); 521 522 if (vma->vm_file) 523 get_file(vma->vm_file); 524 525 memcpy(vma_copy, vma, sizeof(*vma)); 526 527 vma_copy->vm_mm = NULL; 528 vma_copy->vm_next = NULL; 529 vma_copy->vm_prev = NULL; 530 531 return vma_copy; 532 } 533 534 void exynos_gem_put_vma(struct vm_area_struct *vma) 535 { 536 if (!vma) 537 return; 538 539 if (vma->vm_ops && vma->vm_ops->close) 540 vma->vm_ops->close(vma); 541 542 if (vma->vm_file) 543 fput(vma->vm_file); 544 545 kfree(vma); 546 } 547 548 int exynos_gem_get_pages_from_userptr(unsigned long start, 549 unsigned int npages, 550 struct page **pages, 551 struct vm_area_struct *vma) 552 { 553 int get_npages; 554 555 /* the memory region mmaped with VM_PFNMAP. */ 556 if (vma_is_io(vma)) { 557 unsigned int i; 558 559 for (i = 0; i < npages; ++i, start += PAGE_SIZE) { 560 unsigned long pfn; 561 int ret = follow_pfn(vma, start, &pfn); 562 if (ret) 563 return ret; 564 565 pages[i] = pfn_to_page(pfn); 566 } 567 568 if (i != npages) { 569 DRM_ERROR("failed to get user_pages.\n"); 570 return -EINVAL; 571 } 572 573 return 0; 574 } 575 576 get_npages = get_user_pages(current, current->mm, start, 577 npages, 1, 1, pages, NULL); 578 get_npages = max(get_npages, 0); 579 if (get_npages != npages) { 580 DRM_ERROR("failed to get user_pages.\n"); 581 while (get_npages) 582 put_page(pages[--get_npages]); 583 return -EFAULT; 584 } 585 586 return 0; 587 } 588 589 void exynos_gem_put_pages_to_userptr(struct page **pages, 590 unsigned int npages, 591 struct vm_area_struct *vma) 592 { 593 if (!vma_is_io(vma)) { 594 unsigned int i; 595 596 for (i = 0; i < npages; i++) { 597 set_page_dirty_lock(pages[i]); 598 599 /* 600 * undo the reference we took when populating 601 * the table. 602 */ 603 put_page(pages[i]); 604 } 605 } 606 } 607 608 int exynos_gem_map_sgt_with_dma(struct drm_device *drm_dev, 609 struct sg_table *sgt, 610 enum dma_data_direction dir) 611 { 612 int nents; 613 614 mutex_lock(&drm_dev->struct_mutex); 615 616 nents = dma_map_sg(drm_dev->dev, sgt->sgl, sgt->nents, dir); 617 if (!nents) { 618 DRM_ERROR("failed to map sgl with dma.\n"); 619 mutex_unlock(&drm_dev->struct_mutex); 620 return nents; 621 } 622 623 mutex_unlock(&drm_dev->struct_mutex); 624 return 0; 625 } 626 627 void exynos_gem_unmap_sgt_from_dma(struct drm_device *drm_dev, 628 struct sg_table *sgt, 629 enum dma_data_direction dir) 630 { 631 dma_unmap_sg(drm_dev->dev, sgt->sgl, sgt->nents, dir); 632 } 633 634 int exynos_drm_gem_init_object(struct drm_gem_object *obj) 635 { 636 return 0; 637 } 638 639 void exynos_drm_gem_free_object(struct drm_gem_object *obj) 640 { 641 struct exynos_drm_gem_obj *exynos_gem_obj; 642 struct exynos_drm_gem_buf *buf; 643 644 exynos_gem_obj = to_exynos_gem_obj(obj); 645 buf = exynos_gem_obj->buffer; 646 647 if (obj->import_attach) 648 drm_prime_gem_destroy(obj, buf->sgt); 649 650 exynos_drm_gem_destroy(to_exynos_gem_obj(obj)); 651 } 652 653 int exynos_drm_gem_dumb_create(struct drm_file *file_priv, 654 struct drm_device *dev, 655 struct drm_mode_create_dumb *args) 656 { 657 struct exynos_drm_gem_obj *exynos_gem_obj; 658 int ret; 659 660 /* 661 * alocate memory to be used for framebuffer. 662 * - this callback would be called by user application 663 * with DRM_IOCTL_MODE_CREATE_DUMB command. 664 */ 665 666 args->pitch = args->width * ((args->bpp + 7) / 8); 667 args->size = args->pitch * args->height; 668 669 exynos_gem_obj = exynos_drm_gem_create(dev, EXYNOS_BO_CONTIG | 670 EXYNOS_BO_WC, args->size); 671 if (IS_ERR(exynos_gem_obj)) 672 return PTR_ERR(exynos_gem_obj); 673 674 ret = exynos_drm_gem_handle_create(&exynos_gem_obj->base, file_priv, 675 &args->handle); 676 if (ret) { 677 exynos_drm_gem_destroy(exynos_gem_obj); 678 return ret; 679 } 680 681 return 0; 682 } 683 684 int exynos_drm_gem_dumb_map_offset(struct drm_file *file_priv, 685 struct drm_device *dev, uint32_t handle, 686 uint64_t *offset) 687 { 688 struct drm_gem_object *obj; 689 int ret = 0; 690 691 mutex_lock(&dev->struct_mutex); 692 693 /* 694 * get offset of memory allocated for drm framebuffer. 695 * - this callback would be called by user application 696 * with DRM_IOCTL_MODE_MAP_DUMB command. 697 */ 698 699 obj = drm_gem_object_lookup(dev, file_priv, handle); 700 if (!obj) { 701 DRM_ERROR("failed to lookup gem object.\n"); 702 ret = -EINVAL; 703 goto unlock; 704 } 705 706 if (!obj->map_list.map) { 707 ret = drm_gem_create_mmap_offset(obj); 708 if (ret) 709 goto out; 710 } 711 712 *offset = (u64)obj->map_list.hash.key << PAGE_SHIFT; 713 DRM_DEBUG_KMS("offset = 0x%lx\n", (unsigned long)*offset); 714 715 out: 716 drm_gem_object_unreference(obj); 717 unlock: 718 mutex_unlock(&dev->struct_mutex); 719 return ret; 720 } 721 722 int exynos_drm_gem_dumb_destroy(struct drm_file *file_priv, 723 struct drm_device *dev, 724 unsigned int handle) 725 { 726 int ret; 727 728 /* 729 * obj->refcount and obj->handle_count are decreased and 730 * if both them are 0 then exynos_drm_gem_free_object() 731 * would be called by callback to release resources. 732 */ 733 ret = drm_gem_handle_delete(file_priv, handle); 734 if (ret < 0) { 735 DRM_ERROR("failed to delete drm_gem_handle.\n"); 736 return ret; 737 } 738 739 return 0; 740 } 741 742 int exynos_drm_gem_fault(struct vm_area_struct *vma, struct vm_fault *vmf) 743 { 744 struct drm_gem_object *obj = vma->vm_private_data; 745 struct drm_device *dev = obj->dev; 746 unsigned long f_vaddr; 747 pgoff_t page_offset; 748 int ret; 749 750 page_offset = ((unsigned long)vmf->virtual_address - 751 vma->vm_start) >> PAGE_SHIFT; 752 f_vaddr = (unsigned long)vmf->virtual_address; 753 754 mutex_lock(&dev->struct_mutex); 755 756 ret = exynos_drm_gem_map_buf(obj, vma, f_vaddr, page_offset); 757 if (ret < 0) 758 DRM_ERROR("failed to map a buffer with user.\n"); 759 760 mutex_unlock(&dev->struct_mutex); 761 762 return convert_to_vm_err_msg(ret); 763 } 764 765 int exynos_drm_gem_mmap(struct file *filp, struct vm_area_struct *vma) 766 { 767 struct exynos_drm_gem_obj *exynos_gem_obj; 768 struct drm_gem_object *obj; 769 int ret; 770 771 /* set vm_area_struct. */ 772 ret = drm_gem_mmap(filp, vma); 773 if (ret < 0) { 774 DRM_ERROR("failed to mmap.\n"); 775 return ret; 776 } 777 778 obj = vma->vm_private_data; 779 exynos_gem_obj = to_exynos_gem_obj(obj); 780 781 ret = check_gem_flags(exynos_gem_obj->flags); 782 if (ret) { 783 drm_gem_vm_close(vma); 784 drm_gem_free_mmap_offset(obj); 785 return ret; 786 } 787 788 vma->vm_flags &= ~VM_PFNMAP; 789 vma->vm_flags |= VM_MIXEDMAP; 790 791 update_vm_cache_attr(exynos_gem_obj, vma); 792 793 return ret; 794 } 795