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 drm_gem_object *obj; 305 306 obj = drm_gem_object_lookup(dev, filp, gem_handle); 307 if (!obj) { 308 DRM_ERROR("failed to lookup gem object.\n"); 309 return; 310 } 311 312 drm_gem_object_unreference_unlocked(obj); 313 314 /* 315 * decrease obj->refcount one more time because we has already 316 * increased it at exynos_drm_gem_get_dma_addr(). 317 */ 318 drm_gem_object_unreference_unlocked(obj); 319 } 320 321 int exynos_drm_gem_map_offset_ioctl(struct drm_device *dev, void *data, 322 struct drm_file *file_priv) 323 { 324 struct drm_exynos_gem_map_off *args = data; 325 326 DRM_DEBUG_KMS("handle = 0x%x, offset = 0x%lx\n", 327 args->handle, (unsigned long)args->offset); 328 329 if (!(dev->driver->driver_features & DRIVER_GEM)) { 330 DRM_ERROR("does not support GEM.\n"); 331 return -ENODEV; 332 } 333 334 return exynos_drm_gem_dumb_map_offset(file_priv, dev, args->handle, 335 &args->offset); 336 } 337 338 int exynos_drm_gem_mmap_buffer(struct file *filp, 339 struct vm_area_struct *vma) 340 { 341 struct drm_gem_object *obj = filp->private_data; 342 struct exynos_drm_gem_obj *exynos_gem_obj = to_exynos_gem_obj(obj); 343 struct drm_device *drm_dev = obj->dev; 344 struct exynos_drm_gem_buf *buffer; 345 unsigned long vm_size; 346 int ret; 347 348 WARN_ON(!mutex_is_locked(&obj->dev->struct_mutex)); 349 350 vma->vm_flags |= VM_IO | VM_DONTEXPAND | VM_DONTDUMP; 351 vma->vm_private_data = obj; 352 vma->vm_ops = drm_dev->driver->gem_vm_ops; 353 354 update_vm_cache_attr(exynos_gem_obj, vma); 355 356 vm_size = vma->vm_end - vma->vm_start; 357 358 /* 359 * a buffer contains information to physically continuous memory 360 * allocated by user request or at framebuffer creation. 361 */ 362 buffer = exynos_gem_obj->buffer; 363 364 /* check if user-requested size is valid. */ 365 if (vm_size > buffer->size) 366 return -EINVAL; 367 368 ret = dma_mmap_attrs(drm_dev->dev, vma, buffer->pages, 369 buffer->dma_addr, buffer->size, 370 &buffer->dma_attrs); 371 if (ret < 0) { 372 DRM_ERROR("failed to mmap.\n"); 373 return ret; 374 } 375 376 /* 377 * take a reference to this mapping of the object. And this reference 378 * is unreferenced by the corresponding vm_close call. 379 */ 380 drm_gem_object_reference(obj); 381 382 drm_vm_open_locked(drm_dev, vma); 383 384 return 0; 385 } 386 387 int exynos_drm_gem_mmap_ioctl(struct drm_device *dev, void *data, 388 struct drm_file *file_priv) 389 { 390 struct drm_exynos_file_private *exynos_file_priv; 391 struct drm_exynos_gem_mmap *args = data; 392 struct drm_gem_object *obj; 393 struct file *anon_filp; 394 unsigned long addr; 395 396 if (!(dev->driver->driver_features & DRIVER_GEM)) { 397 DRM_ERROR("does not support GEM.\n"); 398 return -ENODEV; 399 } 400 401 mutex_lock(&dev->struct_mutex); 402 403 obj = drm_gem_object_lookup(dev, file_priv, args->handle); 404 if (!obj) { 405 DRM_ERROR("failed to lookup gem object.\n"); 406 mutex_unlock(&dev->struct_mutex); 407 return -EINVAL; 408 } 409 410 exynos_file_priv = file_priv->driver_priv; 411 anon_filp = exynos_file_priv->anon_filp; 412 anon_filp->private_data = obj; 413 414 addr = vm_mmap(anon_filp, 0, args->size, PROT_READ | PROT_WRITE, 415 MAP_SHARED, 0); 416 417 drm_gem_object_unreference(obj); 418 419 if (IS_ERR_VALUE(addr)) { 420 mutex_unlock(&dev->struct_mutex); 421 return (int)addr; 422 } 423 424 mutex_unlock(&dev->struct_mutex); 425 426 args->mapped = addr; 427 428 DRM_DEBUG_KMS("mapped = 0x%lx\n", (unsigned long)args->mapped); 429 430 return 0; 431 } 432 433 int exynos_drm_gem_get_ioctl(struct drm_device *dev, void *data, 434 struct drm_file *file_priv) 435 { struct exynos_drm_gem_obj *exynos_gem_obj; 436 struct drm_exynos_gem_info *args = data; 437 struct drm_gem_object *obj; 438 439 mutex_lock(&dev->struct_mutex); 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 mutex_unlock(&dev->struct_mutex); 445 return -EINVAL; 446 } 447 448 exynos_gem_obj = to_exynos_gem_obj(obj); 449 450 args->flags = exynos_gem_obj->flags; 451 args->size = exynos_gem_obj->size; 452 453 drm_gem_object_unreference(obj); 454 mutex_unlock(&dev->struct_mutex); 455 456 return 0; 457 } 458 459 struct vm_area_struct *exynos_gem_get_vma(struct vm_area_struct *vma) 460 { 461 struct vm_area_struct *vma_copy; 462 463 vma_copy = kmalloc(sizeof(*vma_copy), GFP_KERNEL); 464 if (!vma_copy) 465 return NULL; 466 467 if (vma->vm_ops && vma->vm_ops->open) 468 vma->vm_ops->open(vma); 469 470 if (vma->vm_file) 471 get_file(vma->vm_file); 472 473 memcpy(vma_copy, vma, sizeof(*vma)); 474 475 vma_copy->vm_mm = NULL; 476 vma_copy->vm_next = NULL; 477 vma_copy->vm_prev = NULL; 478 479 return vma_copy; 480 } 481 482 void exynos_gem_put_vma(struct vm_area_struct *vma) 483 { 484 if (!vma) 485 return; 486 487 if (vma->vm_ops && vma->vm_ops->close) 488 vma->vm_ops->close(vma); 489 490 if (vma->vm_file) 491 fput(vma->vm_file); 492 493 kfree(vma); 494 } 495 496 int exynos_gem_get_pages_from_userptr(unsigned long start, 497 unsigned int npages, 498 struct page **pages, 499 struct vm_area_struct *vma) 500 { 501 int get_npages; 502 503 /* the memory region mmaped with VM_PFNMAP. */ 504 if (vma_is_io(vma)) { 505 unsigned int i; 506 507 for (i = 0; i < npages; ++i, start += PAGE_SIZE) { 508 unsigned long pfn; 509 int ret = follow_pfn(vma, start, &pfn); 510 if (ret) 511 return ret; 512 513 pages[i] = pfn_to_page(pfn); 514 } 515 516 if (i != npages) { 517 DRM_ERROR("failed to get user_pages.\n"); 518 return -EINVAL; 519 } 520 521 return 0; 522 } 523 524 get_npages = get_user_pages(current, current->mm, start, 525 npages, 1, 1, pages, NULL); 526 get_npages = max(get_npages, 0); 527 if (get_npages != npages) { 528 DRM_ERROR("failed to get user_pages.\n"); 529 while (get_npages) 530 put_page(pages[--get_npages]); 531 return -EFAULT; 532 } 533 534 return 0; 535 } 536 537 void exynos_gem_put_pages_to_userptr(struct page **pages, 538 unsigned int npages, 539 struct vm_area_struct *vma) 540 { 541 if (!vma_is_io(vma)) { 542 unsigned int i; 543 544 for (i = 0; i < npages; i++) { 545 set_page_dirty_lock(pages[i]); 546 547 /* 548 * undo the reference we took when populating 549 * the table. 550 */ 551 put_page(pages[i]); 552 } 553 } 554 } 555 556 int exynos_gem_map_sgt_with_dma(struct drm_device *drm_dev, 557 struct sg_table *sgt, 558 enum dma_data_direction dir) 559 { 560 int nents; 561 562 mutex_lock(&drm_dev->struct_mutex); 563 564 nents = dma_map_sg(drm_dev->dev, sgt->sgl, sgt->nents, dir); 565 if (!nents) { 566 DRM_ERROR("failed to map sgl with dma.\n"); 567 mutex_unlock(&drm_dev->struct_mutex); 568 return nents; 569 } 570 571 mutex_unlock(&drm_dev->struct_mutex); 572 return 0; 573 } 574 575 void exynos_gem_unmap_sgt_from_dma(struct drm_device *drm_dev, 576 struct sg_table *sgt, 577 enum dma_data_direction dir) 578 { 579 dma_unmap_sg(drm_dev->dev, sgt->sgl, sgt->nents, dir); 580 } 581 582 void exynos_drm_gem_free_object(struct drm_gem_object *obj) 583 { 584 struct exynos_drm_gem_obj *exynos_gem_obj; 585 struct exynos_drm_gem_buf *buf; 586 587 exynos_gem_obj = to_exynos_gem_obj(obj); 588 buf = exynos_gem_obj->buffer; 589 590 if (obj->import_attach) 591 drm_prime_gem_destroy(obj, buf->sgt); 592 593 exynos_drm_gem_destroy(to_exynos_gem_obj(obj)); 594 } 595 596 int exynos_drm_gem_dumb_create(struct drm_file *file_priv, 597 struct drm_device *dev, 598 struct drm_mode_create_dumb *args) 599 { 600 struct exynos_drm_gem_obj *exynos_gem_obj; 601 int ret; 602 603 /* 604 * allocate memory to be used for framebuffer. 605 * - this callback would be called by user application 606 * with DRM_IOCTL_MODE_CREATE_DUMB command. 607 */ 608 609 args->pitch = args->width * ((args->bpp + 7) / 8); 610 args->size = args->pitch * args->height; 611 612 if (is_drm_iommu_supported(dev)) { 613 exynos_gem_obj = exynos_drm_gem_create(dev, 614 EXYNOS_BO_NONCONTIG | EXYNOS_BO_WC, 615 args->size); 616 } else { 617 exynos_gem_obj = exynos_drm_gem_create(dev, 618 EXYNOS_BO_CONTIG | EXYNOS_BO_WC, 619 args->size); 620 } 621 622 if (IS_ERR(exynos_gem_obj)) { 623 dev_warn(dev->dev, "FB allocation failed.\n"); 624 return PTR_ERR(exynos_gem_obj); 625 } 626 627 ret = exynos_drm_gem_handle_create(&exynos_gem_obj->base, file_priv, 628 &args->handle); 629 if (ret) { 630 exynos_drm_gem_destroy(exynos_gem_obj); 631 return ret; 632 } 633 634 return 0; 635 } 636 637 int exynos_drm_gem_dumb_map_offset(struct drm_file *file_priv, 638 struct drm_device *dev, uint32_t handle, 639 uint64_t *offset) 640 { 641 struct drm_gem_object *obj; 642 int ret = 0; 643 644 mutex_lock(&dev->struct_mutex); 645 646 /* 647 * get offset of memory allocated for drm framebuffer. 648 * - this callback would be called by user application 649 * with DRM_IOCTL_MODE_MAP_DUMB command. 650 */ 651 652 obj = drm_gem_object_lookup(dev, file_priv, handle); 653 if (!obj) { 654 DRM_ERROR("failed to lookup gem object.\n"); 655 ret = -EINVAL; 656 goto unlock; 657 } 658 659 ret = drm_gem_create_mmap_offset(obj); 660 if (ret) 661 goto out; 662 663 *offset = drm_vma_node_offset_addr(&obj->vma_node); 664 DRM_DEBUG_KMS("offset = 0x%lx\n", (unsigned long)*offset); 665 666 out: 667 drm_gem_object_unreference(obj); 668 unlock: 669 mutex_unlock(&dev->struct_mutex); 670 return ret; 671 } 672 673 int exynos_drm_gem_fault(struct vm_area_struct *vma, struct vm_fault *vmf) 674 { 675 struct drm_gem_object *obj = vma->vm_private_data; 676 struct drm_device *dev = obj->dev; 677 unsigned long f_vaddr; 678 pgoff_t page_offset; 679 int ret; 680 681 page_offset = ((unsigned long)vmf->virtual_address - 682 vma->vm_start) >> PAGE_SHIFT; 683 f_vaddr = (unsigned long)vmf->virtual_address; 684 685 mutex_lock(&dev->struct_mutex); 686 687 ret = exynos_drm_gem_map_buf(obj, vma, f_vaddr, page_offset); 688 if (ret < 0) 689 DRM_ERROR("failed to map a buffer with user.\n"); 690 691 mutex_unlock(&dev->struct_mutex); 692 693 return convert_to_vm_err_msg(ret); 694 } 695 696 int exynos_drm_gem_mmap(struct file *filp, struct vm_area_struct *vma) 697 { 698 struct exynos_drm_gem_obj *exynos_gem_obj; 699 struct drm_gem_object *obj; 700 int ret; 701 702 /* set vm_area_struct. */ 703 ret = drm_gem_mmap(filp, vma); 704 if (ret < 0) { 705 DRM_ERROR("failed to mmap.\n"); 706 return ret; 707 } 708 709 obj = vma->vm_private_data; 710 exynos_gem_obj = to_exynos_gem_obj(obj); 711 712 ret = check_gem_flags(exynos_gem_obj->flags); 713 if (ret) { 714 drm_gem_vm_close(vma); 715 drm_gem_free_mmap_offset(obj); 716 return ret; 717 } 718 719 vma->vm_flags &= ~VM_PFNMAP; 720 vma->vm_flags |= VM_MIXEDMAP; 721 722 update_vm_cache_attr(exynos_gem_obj, vma); 723 724 return ret; 725 } 726