1 /* exynos_drm_gem.c 2 * 3 * Copyright (c) 2011 Samsung Electronics Co., Ltd. 4 * Author: Inki Dae <inki.dae@samsung.com> 5 * 6 * Permission is hereby granted, free of charge, to any person obtaining a 7 * copy of this software and associated documentation files (the "Software"), 8 * to deal in the Software without restriction, including without limitation 9 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 10 * and/or sell copies of the Software, and to permit persons to whom the 11 * Software is furnished to do so, subject to the following conditions: 12 * 13 * The above copyright notice and this permission notice (including the next 14 * paragraph) shall be included in all copies or substantial portions of the 15 * Software. 16 * 17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 20 * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR 21 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, 22 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR 23 * OTHER DEALINGS IN THE SOFTWARE. 24 */ 25 26 #include <drm/drmP.h> 27 28 #include <linux/shmem_fs.h> 29 #include <drm/exynos_drm.h> 30 31 #include "exynos_drm_drv.h" 32 #include "exynos_drm_gem.h" 33 #include "exynos_drm_buf.h" 34 35 static unsigned int convert_to_vm_err_msg(int msg) 36 { 37 unsigned int out_msg; 38 39 switch (msg) { 40 case 0: 41 case -ERESTARTSYS: 42 case -EINTR: 43 out_msg = VM_FAULT_NOPAGE; 44 break; 45 46 case -ENOMEM: 47 out_msg = VM_FAULT_OOM; 48 break; 49 50 default: 51 out_msg = VM_FAULT_SIGBUS; 52 break; 53 } 54 55 return out_msg; 56 } 57 58 static int check_gem_flags(unsigned int flags) 59 { 60 if (flags & ~(EXYNOS_BO_MASK)) { 61 DRM_ERROR("invalid flags.\n"); 62 return -EINVAL; 63 } 64 65 return 0; 66 } 67 68 static void update_vm_cache_attr(struct exynos_drm_gem_obj *obj, 69 struct vm_area_struct *vma) 70 { 71 DRM_DEBUG_KMS("flags = 0x%x\n", obj->flags); 72 73 /* non-cachable as default. */ 74 if (obj->flags & EXYNOS_BO_CACHABLE) 75 vma->vm_page_prot = vm_get_page_prot(vma->vm_flags); 76 else if (obj->flags & EXYNOS_BO_WC) 77 vma->vm_page_prot = 78 pgprot_writecombine(vm_get_page_prot(vma->vm_flags)); 79 else 80 vma->vm_page_prot = 81 pgprot_noncached(vm_get_page_prot(vma->vm_flags)); 82 } 83 84 static unsigned long roundup_gem_size(unsigned long size, unsigned int flags) 85 { 86 if (!IS_NONCONTIG_BUFFER(flags)) { 87 if (size >= SZ_1M) 88 return roundup(size, SECTION_SIZE); 89 else if (size >= SZ_64K) 90 return roundup(size, SZ_64K); 91 else 92 goto out; 93 } 94 out: 95 return roundup(size, PAGE_SIZE); 96 } 97 98 struct page **exynos_gem_get_pages(struct drm_gem_object *obj, 99 gfp_t gfpmask) 100 { 101 struct page *p, **pages; 102 int i, npages; 103 104 npages = obj->size >> PAGE_SHIFT; 105 106 pages = drm_malloc_ab(npages, sizeof(struct page *)); 107 if (pages == NULL) 108 return ERR_PTR(-ENOMEM); 109 110 for (i = 0; i < npages; i++) { 111 p = alloc_page(gfpmask); 112 if (IS_ERR(p)) 113 goto fail; 114 pages[i] = p; 115 } 116 117 return pages; 118 119 fail: 120 while (--i) 121 __free_page(pages[i]); 122 123 drm_free_large(pages); 124 return ERR_CAST(p); 125 } 126 127 static void exynos_gem_put_pages(struct drm_gem_object *obj, 128 struct page **pages) 129 { 130 int npages; 131 132 npages = obj->size >> PAGE_SHIFT; 133 134 while (--npages >= 0) 135 __free_page(pages[npages]); 136 137 drm_free_large(pages); 138 } 139 140 static int exynos_drm_gem_map_pages(struct drm_gem_object *obj, 141 struct vm_area_struct *vma, 142 unsigned long f_vaddr, 143 pgoff_t page_offset) 144 { 145 struct exynos_drm_gem_obj *exynos_gem_obj = to_exynos_gem_obj(obj); 146 struct exynos_drm_gem_buf *buf = exynos_gem_obj->buffer; 147 unsigned long pfn; 148 149 if (exynos_gem_obj->flags & EXYNOS_BO_NONCONTIG) { 150 if (!buf->pages) 151 return -EINTR; 152 153 pfn = page_to_pfn(buf->pages[page_offset++]); 154 } else 155 pfn = (buf->dma_addr >> PAGE_SHIFT) + page_offset; 156 157 return vm_insert_mixed(vma, f_vaddr, pfn); 158 } 159 160 static int exynos_drm_gem_get_pages(struct drm_gem_object *obj) 161 { 162 struct exynos_drm_gem_obj *exynos_gem_obj = to_exynos_gem_obj(obj); 163 struct exynos_drm_gem_buf *buf = exynos_gem_obj->buffer; 164 struct scatterlist *sgl; 165 struct page **pages; 166 unsigned int npages, i = 0; 167 int ret; 168 169 if (buf->pages) { 170 DRM_DEBUG_KMS("already allocated.\n"); 171 return -EINVAL; 172 } 173 174 pages = exynos_gem_get_pages(obj, GFP_HIGHUSER_MOVABLE); 175 if (IS_ERR(pages)) { 176 DRM_ERROR("failed to get pages.\n"); 177 return PTR_ERR(pages); 178 } 179 180 npages = obj->size >> PAGE_SHIFT; 181 buf->page_size = PAGE_SIZE; 182 183 buf->sgt = kzalloc(sizeof(struct sg_table), GFP_KERNEL); 184 if (!buf->sgt) { 185 DRM_ERROR("failed to allocate sg table.\n"); 186 ret = -ENOMEM; 187 goto err; 188 } 189 190 ret = sg_alloc_table(buf->sgt, npages, GFP_KERNEL); 191 if (ret < 0) { 192 DRM_ERROR("failed to initialize sg table.\n"); 193 ret = -EFAULT; 194 goto err1; 195 } 196 197 sgl = buf->sgt->sgl; 198 199 /* set all pages to sg list. */ 200 while (i < npages) { 201 sg_set_page(sgl, pages[i], PAGE_SIZE, 0); 202 sg_dma_address(sgl) = page_to_phys(pages[i]); 203 i++; 204 sgl = sg_next(sgl); 205 } 206 207 /* add some codes for UNCACHED type here. TODO */ 208 209 buf->pages = pages; 210 return ret; 211 err1: 212 kfree(buf->sgt); 213 buf->sgt = NULL; 214 err: 215 exynos_gem_put_pages(obj, pages); 216 return ret; 217 218 } 219 220 static void exynos_drm_gem_put_pages(struct drm_gem_object *obj) 221 { 222 struct exynos_drm_gem_obj *exynos_gem_obj = to_exynos_gem_obj(obj); 223 struct exynos_drm_gem_buf *buf = exynos_gem_obj->buffer; 224 225 /* 226 * if buffer typs is EXYNOS_BO_NONCONTIG then release all pages 227 * allocated at gem fault handler. 228 */ 229 sg_free_table(buf->sgt); 230 kfree(buf->sgt); 231 buf->sgt = NULL; 232 233 exynos_gem_put_pages(obj, buf->pages); 234 buf->pages = NULL; 235 236 /* add some codes for UNCACHED type here. TODO */ 237 } 238 239 static int exynos_drm_gem_handle_create(struct drm_gem_object *obj, 240 struct drm_file *file_priv, 241 unsigned int *handle) 242 { 243 int ret; 244 245 /* 246 * allocate a id of idr table where the obj is registered 247 * and handle has the id what user can see. 248 */ 249 ret = drm_gem_handle_create(file_priv, obj, handle); 250 if (ret) 251 return ret; 252 253 DRM_DEBUG_KMS("gem handle = 0x%x\n", *handle); 254 255 /* drop reference from allocate - handle holds it now. */ 256 drm_gem_object_unreference_unlocked(obj); 257 258 return 0; 259 } 260 261 void exynos_drm_gem_destroy(struct exynos_drm_gem_obj *exynos_gem_obj) 262 { 263 struct drm_gem_object *obj; 264 struct exynos_drm_gem_buf *buf; 265 266 DRM_DEBUG_KMS("%s\n", __FILE__); 267 268 obj = &exynos_gem_obj->base; 269 buf = exynos_gem_obj->buffer; 270 271 DRM_DEBUG_KMS("handle count = %d\n", atomic_read(&obj->handle_count)); 272 273 if (!buf->pages) 274 return; 275 276 /* 277 * do not release memory region from exporter. 278 * 279 * the region will be released by exporter 280 * once dmabuf's refcount becomes 0. 281 */ 282 if (obj->import_attach) 283 goto out; 284 285 if (exynos_gem_obj->flags & EXYNOS_BO_NONCONTIG) 286 exynos_drm_gem_put_pages(obj); 287 else 288 exynos_drm_free_buf(obj->dev, exynos_gem_obj->flags, buf); 289 290 out: 291 exynos_drm_fini_buf(obj->dev, buf); 292 exynos_gem_obj->buffer = NULL; 293 294 if (obj->map_list.map) 295 drm_gem_free_mmap_offset(obj); 296 297 /* release file pointer to gem object. */ 298 drm_gem_object_release(obj); 299 300 kfree(exynos_gem_obj); 301 exynos_gem_obj = NULL; 302 } 303 304 struct exynos_drm_gem_obj *exynos_drm_gem_init(struct drm_device *dev, 305 unsigned long size) 306 { 307 struct exynos_drm_gem_obj *exynos_gem_obj; 308 struct drm_gem_object *obj; 309 int ret; 310 311 exynos_gem_obj = kzalloc(sizeof(*exynos_gem_obj), GFP_KERNEL); 312 if (!exynos_gem_obj) { 313 DRM_ERROR("failed to allocate exynos gem object\n"); 314 return NULL; 315 } 316 317 exynos_gem_obj->size = size; 318 obj = &exynos_gem_obj->base; 319 320 ret = drm_gem_object_init(dev, obj, size); 321 if (ret < 0) { 322 DRM_ERROR("failed to initialize gem object\n"); 323 kfree(exynos_gem_obj); 324 return NULL; 325 } 326 327 DRM_DEBUG_KMS("created file object = 0x%x\n", (unsigned int)obj->filp); 328 329 return exynos_gem_obj; 330 } 331 332 struct exynos_drm_gem_obj *exynos_drm_gem_create(struct drm_device *dev, 333 unsigned int flags, 334 unsigned long size) 335 { 336 struct exynos_drm_gem_obj *exynos_gem_obj; 337 struct exynos_drm_gem_buf *buf; 338 int ret; 339 340 if (!size) { 341 DRM_ERROR("invalid size.\n"); 342 return ERR_PTR(-EINVAL); 343 } 344 345 size = roundup_gem_size(size, flags); 346 DRM_DEBUG_KMS("%s\n", __FILE__); 347 348 ret = check_gem_flags(flags); 349 if (ret) 350 return ERR_PTR(ret); 351 352 buf = exynos_drm_init_buf(dev, size); 353 if (!buf) 354 return ERR_PTR(-ENOMEM); 355 356 exynos_gem_obj = exynos_drm_gem_init(dev, size); 357 if (!exynos_gem_obj) { 358 ret = -ENOMEM; 359 goto err_fini_buf; 360 } 361 362 exynos_gem_obj->buffer = buf; 363 364 /* set memory type and cache attribute from user side. */ 365 exynos_gem_obj->flags = flags; 366 367 /* 368 * allocate all pages as desired size if user wants to allocate 369 * physically non-continuous memory. 370 */ 371 if (flags & EXYNOS_BO_NONCONTIG) { 372 ret = exynos_drm_gem_get_pages(&exynos_gem_obj->base); 373 if (ret < 0) { 374 drm_gem_object_release(&exynos_gem_obj->base); 375 goto err_fini_buf; 376 } 377 } else { 378 ret = exynos_drm_alloc_buf(dev, buf, flags); 379 if (ret < 0) { 380 drm_gem_object_release(&exynos_gem_obj->base); 381 goto err_fini_buf; 382 } 383 } 384 385 return exynos_gem_obj; 386 387 err_fini_buf: 388 exynos_drm_fini_buf(dev, buf); 389 return ERR_PTR(ret); 390 } 391 392 int exynos_drm_gem_create_ioctl(struct drm_device *dev, void *data, 393 struct drm_file *file_priv) 394 { 395 struct drm_exynos_gem_create *args = data; 396 struct exynos_drm_gem_obj *exynos_gem_obj; 397 int ret; 398 399 DRM_DEBUG_KMS("%s\n", __FILE__); 400 401 exynos_gem_obj = exynos_drm_gem_create(dev, args->flags, args->size); 402 if (IS_ERR(exynos_gem_obj)) 403 return PTR_ERR(exynos_gem_obj); 404 405 ret = exynos_drm_gem_handle_create(&exynos_gem_obj->base, file_priv, 406 &args->handle); 407 if (ret) { 408 exynos_drm_gem_destroy(exynos_gem_obj); 409 return ret; 410 } 411 412 return 0; 413 } 414 415 void *exynos_drm_gem_get_dma_addr(struct drm_device *dev, 416 unsigned int gem_handle, 417 struct drm_file *file_priv) 418 { 419 struct exynos_drm_gem_obj *exynos_gem_obj; 420 struct drm_gem_object *obj; 421 422 obj = drm_gem_object_lookup(dev, file_priv, gem_handle); 423 if (!obj) { 424 DRM_ERROR("failed to lookup gem object.\n"); 425 return ERR_PTR(-EINVAL); 426 } 427 428 exynos_gem_obj = to_exynos_gem_obj(obj); 429 430 if (exynos_gem_obj->flags & EXYNOS_BO_NONCONTIG) { 431 DRM_DEBUG_KMS("not support NONCONTIG type.\n"); 432 drm_gem_object_unreference_unlocked(obj); 433 434 /* TODO */ 435 return ERR_PTR(-EINVAL); 436 } 437 438 return &exynos_gem_obj->buffer->dma_addr; 439 } 440 441 void exynos_drm_gem_put_dma_addr(struct drm_device *dev, 442 unsigned int gem_handle, 443 struct drm_file *file_priv) 444 { 445 struct exynos_drm_gem_obj *exynos_gem_obj; 446 struct drm_gem_object *obj; 447 448 obj = drm_gem_object_lookup(dev, file_priv, gem_handle); 449 if (!obj) { 450 DRM_ERROR("failed to lookup gem object.\n"); 451 return; 452 } 453 454 exynos_gem_obj = to_exynos_gem_obj(obj); 455 456 if (exynos_gem_obj->flags & EXYNOS_BO_NONCONTIG) { 457 DRM_DEBUG_KMS("not support NONCONTIG type.\n"); 458 drm_gem_object_unreference_unlocked(obj); 459 460 /* TODO */ 461 return; 462 } 463 464 drm_gem_object_unreference_unlocked(obj); 465 466 /* 467 * decrease obj->refcount one more time because we has already 468 * increased it at exynos_drm_gem_get_dma_addr(). 469 */ 470 drm_gem_object_unreference_unlocked(obj); 471 } 472 473 int exynos_drm_gem_map_offset_ioctl(struct drm_device *dev, void *data, 474 struct drm_file *file_priv) 475 { 476 struct drm_exynos_gem_map_off *args = data; 477 478 DRM_DEBUG_KMS("%s\n", __FILE__); 479 480 DRM_DEBUG_KMS("handle = 0x%x, offset = 0x%lx\n", 481 args->handle, (unsigned long)args->offset); 482 483 if (!(dev->driver->driver_features & DRIVER_GEM)) { 484 DRM_ERROR("does not support GEM.\n"); 485 return -ENODEV; 486 } 487 488 return exynos_drm_gem_dumb_map_offset(file_priv, dev, args->handle, 489 &args->offset); 490 } 491 492 static int exynos_drm_gem_mmap_buffer(struct file *filp, 493 struct vm_area_struct *vma) 494 { 495 struct drm_gem_object *obj = filp->private_data; 496 struct exynos_drm_gem_obj *exynos_gem_obj = to_exynos_gem_obj(obj); 497 struct exynos_drm_gem_buf *buffer; 498 unsigned long pfn, vm_size, usize, uaddr = vma->vm_start; 499 int ret; 500 501 DRM_DEBUG_KMS("%s\n", __FILE__); 502 503 vma->vm_flags |= VM_IO | VM_DONTEXPAND | VM_DONTDUMP; 504 505 update_vm_cache_attr(exynos_gem_obj, vma); 506 507 vm_size = usize = vma->vm_end - vma->vm_start; 508 509 /* 510 * a buffer contains information to physically continuous memory 511 * allocated by user request or at framebuffer creation. 512 */ 513 buffer = exynos_gem_obj->buffer; 514 515 /* check if user-requested size is valid. */ 516 if (vm_size > buffer->size) 517 return -EINVAL; 518 519 if (exynos_gem_obj->flags & EXYNOS_BO_NONCONTIG) { 520 int i = 0; 521 522 if (!buffer->pages) 523 return -EINVAL; 524 525 vma->vm_flags |= VM_MIXEDMAP; 526 527 do { 528 ret = vm_insert_page(vma, uaddr, buffer->pages[i++]); 529 if (ret) { 530 DRM_ERROR("failed to remap user space.\n"); 531 return ret; 532 } 533 534 uaddr += PAGE_SIZE; 535 usize -= PAGE_SIZE; 536 } while (usize > 0); 537 } else { 538 /* 539 * get page frame number to physical memory to be mapped 540 * to user space. 541 */ 542 pfn = ((unsigned long)exynos_gem_obj->buffer->dma_addr) >> 543 PAGE_SHIFT; 544 545 DRM_DEBUG_KMS("pfn = 0x%lx\n", pfn); 546 547 if (remap_pfn_range(vma, vma->vm_start, pfn, vm_size, 548 vma->vm_page_prot)) { 549 DRM_ERROR("failed to remap pfn range.\n"); 550 return -EAGAIN; 551 } 552 } 553 554 return 0; 555 } 556 557 static const struct file_operations exynos_drm_gem_fops = { 558 .mmap = exynos_drm_gem_mmap_buffer, 559 }; 560 561 int exynos_drm_gem_mmap_ioctl(struct drm_device *dev, void *data, 562 struct drm_file *file_priv) 563 { 564 struct drm_exynos_gem_mmap *args = data; 565 struct drm_gem_object *obj; 566 unsigned int addr; 567 568 DRM_DEBUG_KMS("%s\n", __FILE__); 569 570 if (!(dev->driver->driver_features & DRIVER_GEM)) { 571 DRM_ERROR("does not support GEM.\n"); 572 return -ENODEV; 573 } 574 575 obj = drm_gem_object_lookup(dev, file_priv, args->handle); 576 if (!obj) { 577 DRM_ERROR("failed to lookup gem object.\n"); 578 return -EINVAL; 579 } 580 581 obj->filp->f_op = &exynos_drm_gem_fops; 582 obj->filp->private_data = obj; 583 584 addr = vm_mmap(obj->filp, 0, args->size, 585 PROT_READ | PROT_WRITE, MAP_SHARED, 0); 586 587 drm_gem_object_unreference_unlocked(obj); 588 589 if (IS_ERR((void *)addr)) 590 return PTR_ERR((void *)addr); 591 592 args->mapped = addr; 593 594 DRM_DEBUG_KMS("mapped = 0x%lx\n", (unsigned long)args->mapped); 595 596 return 0; 597 } 598 599 int exynos_drm_gem_get_ioctl(struct drm_device *dev, void *data, 600 struct drm_file *file_priv) 601 { struct exynos_drm_gem_obj *exynos_gem_obj; 602 struct drm_exynos_gem_info *args = data; 603 struct drm_gem_object *obj; 604 605 mutex_lock(&dev->struct_mutex); 606 607 obj = drm_gem_object_lookup(dev, file_priv, args->handle); 608 if (!obj) { 609 DRM_ERROR("failed to lookup gem object.\n"); 610 mutex_unlock(&dev->struct_mutex); 611 return -EINVAL; 612 } 613 614 exynos_gem_obj = to_exynos_gem_obj(obj); 615 616 args->flags = exynos_gem_obj->flags; 617 args->size = exynos_gem_obj->size; 618 619 drm_gem_object_unreference(obj); 620 mutex_unlock(&dev->struct_mutex); 621 622 return 0; 623 } 624 625 int exynos_drm_gem_init_object(struct drm_gem_object *obj) 626 { 627 DRM_DEBUG_KMS("%s\n", __FILE__); 628 629 return 0; 630 } 631 632 void exynos_drm_gem_free_object(struct drm_gem_object *obj) 633 { 634 struct exynos_drm_gem_obj *exynos_gem_obj; 635 struct exynos_drm_gem_buf *buf; 636 637 DRM_DEBUG_KMS("%s\n", __FILE__); 638 639 exynos_gem_obj = to_exynos_gem_obj(obj); 640 buf = exynos_gem_obj->buffer; 641 642 if (obj->import_attach) 643 drm_prime_gem_destroy(obj, buf->sgt); 644 645 exynos_drm_gem_destroy(to_exynos_gem_obj(obj)); 646 } 647 648 int exynos_drm_gem_dumb_create(struct drm_file *file_priv, 649 struct drm_device *dev, 650 struct drm_mode_create_dumb *args) 651 { 652 struct exynos_drm_gem_obj *exynos_gem_obj; 653 int ret; 654 655 DRM_DEBUG_KMS("%s\n", __FILE__); 656 657 /* 658 * alocate memory to be used for framebuffer. 659 * - this callback would be called by user application 660 * with DRM_IOCTL_MODE_CREATE_DUMB command. 661 */ 662 663 args->pitch = args->width * ((args->bpp + 7) / 8); 664 args->size = args->pitch * args->height; 665 666 exynos_gem_obj = exynos_drm_gem_create(dev, args->flags, args->size); 667 if (IS_ERR(exynos_gem_obj)) 668 return PTR_ERR(exynos_gem_obj); 669 670 ret = exynos_drm_gem_handle_create(&exynos_gem_obj->base, file_priv, 671 &args->handle); 672 if (ret) { 673 exynos_drm_gem_destroy(exynos_gem_obj); 674 return ret; 675 } 676 677 return 0; 678 } 679 680 int exynos_drm_gem_dumb_map_offset(struct drm_file *file_priv, 681 struct drm_device *dev, uint32_t handle, 682 uint64_t *offset) 683 { 684 struct drm_gem_object *obj; 685 int ret = 0; 686 687 DRM_DEBUG_KMS("%s\n", __FILE__); 688 689 mutex_lock(&dev->struct_mutex); 690 691 /* 692 * get offset of memory allocated for drm framebuffer. 693 * - this callback would be called by user application 694 * with DRM_IOCTL_MODE_MAP_DUMB command. 695 */ 696 697 obj = drm_gem_object_lookup(dev, file_priv, handle); 698 if (!obj) { 699 DRM_ERROR("failed to lookup gem object.\n"); 700 ret = -EINVAL; 701 goto unlock; 702 } 703 704 if (!obj->map_list.map) { 705 ret = drm_gem_create_mmap_offset(obj); 706 if (ret) 707 goto out; 708 } 709 710 *offset = (u64)obj->map_list.hash.key << PAGE_SHIFT; 711 DRM_DEBUG_KMS("offset = 0x%lx\n", (unsigned long)*offset); 712 713 out: 714 drm_gem_object_unreference(obj); 715 unlock: 716 mutex_unlock(&dev->struct_mutex); 717 return ret; 718 } 719 720 int exynos_drm_gem_dumb_destroy(struct drm_file *file_priv, 721 struct drm_device *dev, 722 unsigned int handle) 723 { 724 int ret; 725 726 DRM_DEBUG_KMS("%s\n", __FILE__); 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_pages(obj, vma, f_vaddr, page_offset); 757 if (ret < 0) 758 DRM_ERROR("failed to map pages.\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 DRM_DEBUG_KMS("%s\n", __FILE__); 772 773 /* set vm_area_struct. */ 774 ret = drm_gem_mmap(filp, vma); 775 if (ret < 0) { 776 DRM_ERROR("failed to mmap.\n"); 777 return ret; 778 } 779 780 obj = vma->vm_private_data; 781 exynos_gem_obj = to_exynos_gem_obj(obj); 782 783 ret = check_gem_flags(exynos_gem_obj->flags); 784 if (ret) { 785 drm_gem_vm_close(vma); 786 drm_gem_free_mmap_offset(obj); 787 return ret; 788 } 789 790 vma->vm_flags &= ~VM_PFNMAP; 791 vma->vm_flags |= VM_MIXEDMAP; 792 793 update_vm_cache_attr(exynos_gem_obj, vma); 794 795 return ret; 796 } 797