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