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