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