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 /* find current process's drm_file from filelist. */ 333 list_for_each_entry(file_priv, &drm_dev->filelist, lhead) 334 if (file_priv->filp == filp) 335 return file_priv; 336 337 WARN_ON(1); 338 339 return ERR_PTR(-EFAULT); 340 } 341 342 static int exynos_drm_gem_mmap_buffer(struct file *filp, 343 struct vm_area_struct *vma) 344 { 345 struct drm_gem_object *obj = filp->private_data; 346 struct exynos_drm_gem_obj *exynos_gem_obj = to_exynos_gem_obj(obj); 347 struct drm_device *drm_dev = obj->dev; 348 struct exynos_drm_gem_buf *buffer; 349 struct drm_file *file_priv; 350 unsigned long vm_size; 351 int ret; 352 353 DRM_DEBUG_KMS("%s\n", __FILE__); 354 355 vma->vm_flags |= VM_IO | VM_DONTEXPAND | VM_DONTDUMP; 356 vma->vm_private_data = obj; 357 vma->vm_ops = drm_dev->driver->gem_vm_ops; 358 359 /* restore it to driver's fops. */ 360 filp->f_op = fops_get(drm_dev->driver->fops); 361 362 file_priv = exynos_drm_find_drm_file(drm_dev, filp); 363 if (IS_ERR(file_priv)) 364 return PTR_ERR(file_priv); 365 366 /* restore it to drm_file. */ 367 filp->private_data = file_priv; 368 369 update_vm_cache_attr(exynos_gem_obj, vma); 370 371 vm_size = vma->vm_end - vma->vm_start; 372 373 /* 374 * a buffer contains information to physically continuous memory 375 * allocated by user request or at framebuffer creation. 376 */ 377 buffer = exynos_gem_obj->buffer; 378 379 /* check if user-requested size is valid. */ 380 if (vm_size > buffer->size) 381 return -EINVAL; 382 383 ret = dma_mmap_attrs(drm_dev->dev, vma, buffer->pages, 384 buffer->dma_addr, buffer->size, 385 &buffer->dma_attrs); 386 if (ret < 0) { 387 DRM_ERROR("failed to mmap.\n"); 388 return ret; 389 } 390 391 /* 392 * take a reference to this mapping of the object. And this reference 393 * is unreferenced by the corresponding vm_close call. 394 */ 395 drm_gem_object_reference(obj); 396 397 drm_vm_open_locked(drm_dev, vma); 398 399 return 0; 400 } 401 402 static const struct file_operations exynos_drm_gem_fops = { 403 .mmap = exynos_drm_gem_mmap_buffer, 404 }; 405 406 int exynos_drm_gem_mmap_ioctl(struct drm_device *dev, void *data, 407 struct drm_file *file_priv) 408 { 409 struct drm_exynos_gem_mmap *args = data; 410 struct drm_gem_object *obj; 411 unsigned int addr; 412 413 DRM_DEBUG_KMS("%s\n", __FILE__); 414 415 if (!(dev->driver->driver_features & DRIVER_GEM)) { 416 DRM_ERROR("does not support GEM.\n"); 417 return -ENODEV; 418 } 419 420 obj = drm_gem_object_lookup(dev, file_priv, args->handle); 421 if (!obj) { 422 DRM_ERROR("failed to lookup gem object.\n"); 423 return -EINVAL; 424 } 425 426 /* 427 * We have to use gem object and its fops for specific mmaper, 428 * but vm_mmap() can deliver only filp. So we have to change 429 * filp->f_op and filp->private_data temporarily, then restore 430 * again. So it is important to keep lock until restoration the 431 * settings to prevent others from misuse of filp->f_op or 432 * filp->private_data. 433 */ 434 mutex_lock(&dev->struct_mutex); 435 436 /* 437 * Set specific mmper's fops. And it will be restored by 438 * exynos_drm_gem_mmap_buffer to dev->driver->fops. 439 * This is used to call specific mapper temporarily. 440 */ 441 file_priv->filp->f_op = &exynos_drm_gem_fops; 442 443 /* 444 * Set gem object to private_data so that specific mmaper 445 * can get the gem object. And it will be restored by 446 * exynos_drm_gem_mmap_buffer to drm_file. 447 */ 448 file_priv->filp->private_data = obj; 449 450 addr = vm_mmap(file_priv->filp, 0, args->size, 451 PROT_READ | PROT_WRITE, MAP_SHARED, 0); 452 453 drm_gem_object_unreference(obj); 454 455 if (IS_ERR((void *)addr)) { 456 /* check filp->f_op, filp->private_data are restored */ 457 if (file_priv->filp->f_op == &exynos_drm_gem_fops) { 458 file_priv->filp->f_op = fops_get(dev->driver->fops); 459 file_priv->filp->private_data = file_priv; 460 } 461 mutex_unlock(&dev->struct_mutex); 462 return PTR_ERR((void *)addr); 463 } 464 465 mutex_unlock(&dev->struct_mutex); 466 467 args->mapped = addr; 468 469 DRM_DEBUG_KMS("mapped = 0x%lx\n", (unsigned long)args->mapped); 470 471 return 0; 472 } 473 474 int exynos_drm_gem_get_ioctl(struct drm_device *dev, void *data, 475 struct drm_file *file_priv) 476 { struct exynos_drm_gem_obj *exynos_gem_obj; 477 struct drm_exynos_gem_info *args = data; 478 struct drm_gem_object *obj; 479 480 mutex_lock(&dev->struct_mutex); 481 482 obj = drm_gem_object_lookup(dev, file_priv, args->handle); 483 if (!obj) { 484 DRM_ERROR("failed to lookup gem object.\n"); 485 mutex_unlock(&dev->struct_mutex); 486 return -EINVAL; 487 } 488 489 exynos_gem_obj = to_exynos_gem_obj(obj); 490 491 args->flags = exynos_gem_obj->flags; 492 args->size = exynos_gem_obj->size; 493 494 drm_gem_object_unreference(obj); 495 mutex_unlock(&dev->struct_mutex); 496 497 return 0; 498 } 499 500 struct vm_area_struct *exynos_gem_get_vma(struct vm_area_struct *vma) 501 { 502 struct vm_area_struct *vma_copy; 503 504 vma_copy = kmalloc(sizeof(*vma_copy), GFP_KERNEL); 505 if (!vma_copy) 506 return NULL; 507 508 if (vma->vm_ops && vma->vm_ops->open) 509 vma->vm_ops->open(vma); 510 511 if (vma->vm_file) 512 get_file(vma->vm_file); 513 514 memcpy(vma_copy, vma, sizeof(*vma)); 515 516 vma_copy->vm_mm = NULL; 517 vma_copy->vm_next = NULL; 518 vma_copy->vm_prev = NULL; 519 520 return vma_copy; 521 } 522 523 void exynos_gem_put_vma(struct vm_area_struct *vma) 524 { 525 if (!vma) 526 return; 527 528 if (vma->vm_ops && vma->vm_ops->close) 529 vma->vm_ops->close(vma); 530 531 if (vma->vm_file) 532 fput(vma->vm_file); 533 534 kfree(vma); 535 } 536 537 int exynos_gem_get_pages_from_userptr(unsigned long start, 538 unsigned int npages, 539 struct page **pages, 540 struct vm_area_struct *vma) 541 { 542 int get_npages; 543 544 /* the memory region mmaped with VM_PFNMAP. */ 545 if (vma_is_io(vma)) { 546 unsigned int i; 547 548 for (i = 0; i < npages; ++i, start += PAGE_SIZE) { 549 unsigned long pfn; 550 int ret = follow_pfn(vma, start, &pfn); 551 if (ret) 552 return ret; 553 554 pages[i] = pfn_to_page(pfn); 555 } 556 557 if (i != npages) { 558 DRM_ERROR("failed to get user_pages.\n"); 559 return -EINVAL; 560 } 561 562 return 0; 563 } 564 565 get_npages = get_user_pages(current, current->mm, start, 566 npages, 1, 1, pages, NULL); 567 get_npages = max(get_npages, 0); 568 if (get_npages != npages) { 569 DRM_ERROR("failed to get user_pages.\n"); 570 while (get_npages) 571 put_page(pages[--get_npages]); 572 return -EFAULT; 573 } 574 575 return 0; 576 } 577 578 void exynos_gem_put_pages_to_userptr(struct page **pages, 579 unsigned int npages, 580 struct vm_area_struct *vma) 581 { 582 if (!vma_is_io(vma)) { 583 unsigned int i; 584 585 for (i = 0; i < npages; i++) { 586 set_page_dirty_lock(pages[i]); 587 588 /* 589 * undo the reference we took when populating 590 * the table. 591 */ 592 put_page(pages[i]); 593 } 594 } 595 } 596 597 int exynos_gem_map_sgt_with_dma(struct drm_device *drm_dev, 598 struct sg_table *sgt, 599 enum dma_data_direction dir) 600 { 601 int nents; 602 603 mutex_lock(&drm_dev->struct_mutex); 604 605 nents = dma_map_sg(drm_dev->dev, sgt->sgl, sgt->nents, dir); 606 if (!nents) { 607 DRM_ERROR("failed to map sgl with dma.\n"); 608 mutex_unlock(&drm_dev->struct_mutex); 609 return nents; 610 } 611 612 mutex_unlock(&drm_dev->struct_mutex); 613 return 0; 614 } 615 616 void exynos_gem_unmap_sgt_from_dma(struct drm_device *drm_dev, 617 struct sg_table *sgt, 618 enum dma_data_direction dir) 619 { 620 dma_unmap_sg(drm_dev->dev, sgt->sgl, sgt->nents, dir); 621 } 622 623 int exynos_drm_gem_init_object(struct drm_gem_object *obj) 624 { 625 DRM_DEBUG_KMS("%s\n", __FILE__); 626 627 return 0; 628 } 629 630 void exynos_drm_gem_free_object(struct drm_gem_object *obj) 631 { 632 struct exynos_drm_gem_obj *exynos_gem_obj; 633 struct exynos_drm_gem_buf *buf; 634 635 DRM_DEBUG_KMS("%s\n", __FILE__); 636 637 exynos_gem_obj = to_exynos_gem_obj(obj); 638 buf = exynos_gem_obj->buffer; 639 640 if (obj->import_attach) 641 drm_prime_gem_destroy(obj, buf->sgt); 642 643 exynos_drm_gem_destroy(to_exynos_gem_obj(obj)); 644 } 645 646 int exynos_drm_gem_dumb_create(struct drm_file *file_priv, 647 struct drm_device *dev, 648 struct drm_mode_create_dumb *args) 649 { 650 struct exynos_drm_gem_obj *exynos_gem_obj; 651 int ret; 652 653 DRM_DEBUG_KMS("%s\n", __FILE__); 654 655 /* 656 * alocate memory to be used for framebuffer. 657 * - this callback would be called by user application 658 * with DRM_IOCTL_MODE_CREATE_DUMB command. 659 */ 660 661 args->pitch = args->width * ((args->bpp + 7) / 8); 662 args->size = args->pitch * args->height; 663 664 exynos_gem_obj = exynos_drm_gem_create(dev, args->flags, args->size); 665 if (IS_ERR(exynos_gem_obj)) 666 return PTR_ERR(exynos_gem_obj); 667 668 ret = exynos_drm_gem_handle_create(&exynos_gem_obj->base, file_priv, 669 &args->handle); 670 if (ret) { 671 exynos_drm_gem_destroy(exynos_gem_obj); 672 return ret; 673 } 674 675 return 0; 676 } 677 678 int exynos_drm_gem_dumb_map_offset(struct drm_file *file_priv, 679 struct drm_device *dev, uint32_t handle, 680 uint64_t *offset) 681 { 682 struct drm_gem_object *obj; 683 int ret = 0; 684 685 DRM_DEBUG_KMS("%s\n", __FILE__); 686 687 mutex_lock(&dev->struct_mutex); 688 689 /* 690 * get offset of memory allocated for drm framebuffer. 691 * - this callback would be called by user application 692 * with DRM_IOCTL_MODE_MAP_DUMB command. 693 */ 694 695 obj = drm_gem_object_lookup(dev, file_priv, handle); 696 if (!obj) { 697 DRM_ERROR("failed to lookup gem object.\n"); 698 ret = -EINVAL; 699 goto unlock; 700 } 701 702 if (!obj->map_list.map) { 703 ret = drm_gem_create_mmap_offset(obj); 704 if (ret) 705 goto out; 706 } 707 708 *offset = (u64)obj->map_list.hash.key << PAGE_SHIFT; 709 DRM_DEBUG_KMS("offset = 0x%lx\n", (unsigned long)*offset); 710 711 out: 712 drm_gem_object_unreference(obj); 713 unlock: 714 mutex_unlock(&dev->struct_mutex); 715 return ret; 716 } 717 718 int exynos_drm_gem_dumb_destroy(struct drm_file *file_priv, 719 struct drm_device *dev, 720 unsigned int handle) 721 { 722 int ret; 723 724 DRM_DEBUG_KMS("%s\n", __FILE__); 725 726 /* 727 * obj->refcount and obj->handle_count are decreased and 728 * if both them are 0 then exynos_drm_gem_free_object() 729 * would be called by callback to release resources. 730 */ 731 ret = drm_gem_handle_delete(file_priv, handle); 732 if (ret < 0) { 733 DRM_ERROR("failed to delete drm_gem_handle.\n"); 734 return ret; 735 } 736 737 return 0; 738 } 739 740 int exynos_drm_gem_fault(struct vm_area_struct *vma, struct vm_fault *vmf) 741 { 742 struct drm_gem_object *obj = vma->vm_private_data; 743 struct drm_device *dev = obj->dev; 744 unsigned long f_vaddr; 745 pgoff_t page_offset; 746 int ret; 747 748 page_offset = ((unsigned long)vmf->virtual_address - 749 vma->vm_start) >> PAGE_SHIFT; 750 f_vaddr = (unsigned long)vmf->virtual_address; 751 752 mutex_lock(&dev->struct_mutex); 753 754 ret = exynos_drm_gem_map_buf(obj, vma, f_vaddr, page_offset); 755 if (ret < 0) 756 DRM_ERROR("failed to map a buffer with user.\n"); 757 758 mutex_unlock(&dev->struct_mutex); 759 760 return convert_to_vm_err_msg(ret); 761 } 762 763 int exynos_drm_gem_mmap(struct file *filp, struct vm_area_struct *vma) 764 { 765 struct exynos_drm_gem_obj *exynos_gem_obj; 766 struct drm_gem_object *obj; 767 int ret; 768 769 DRM_DEBUG_KMS("%s\n", __FILE__); 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