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 } 817