1 /* 2 * NVIDIA Tegra DRM GEM helper functions 3 * 4 * Copyright (C) 2012 Sascha Hauer, Pengutronix 5 * Copyright (C) 2013-2015 NVIDIA CORPORATION, All rights reserved. 6 * 7 * Based on the GEM/CMA helpers 8 * 9 * Copyright (c) 2011 Samsung Electronics Co., Ltd. 10 * 11 * This program is free software; you can redistribute it and/or modify 12 * it under the terms of the GNU General Public License version 2 as 13 * published by the Free Software Foundation. 14 */ 15 16 #include <linux/dma-buf.h> 17 #include <linux/iommu.h> 18 #include <drm/tegra_drm.h> 19 20 #include "drm.h" 21 #include "gem.h" 22 23 static inline struct tegra_bo *host1x_to_tegra_bo(struct host1x_bo *bo) 24 { 25 return container_of(bo, struct tegra_bo, base); 26 } 27 28 static void tegra_bo_put(struct host1x_bo *bo) 29 { 30 struct tegra_bo *obj = host1x_to_tegra_bo(bo); 31 32 drm_gem_object_unreference_unlocked(&obj->gem); 33 } 34 35 static dma_addr_t tegra_bo_pin(struct host1x_bo *bo, struct sg_table **sgt) 36 { 37 struct tegra_bo *obj = host1x_to_tegra_bo(bo); 38 39 *sgt = obj->sgt; 40 41 return obj->paddr; 42 } 43 44 static void tegra_bo_unpin(struct host1x_bo *bo, struct sg_table *sgt) 45 { 46 } 47 48 static void *tegra_bo_mmap(struct host1x_bo *bo) 49 { 50 struct tegra_bo *obj = host1x_to_tegra_bo(bo); 51 52 if (obj->vaddr) 53 return obj->vaddr; 54 else if (obj->gem.import_attach) 55 return dma_buf_vmap(obj->gem.import_attach->dmabuf); 56 else 57 return vmap(obj->pages, obj->num_pages, VM_MAP, 58 pgprot_writecombine(PAGE_KERNEL)); 59 } 60 61 static void tegra_bo_munmap(struct host1x_bo *bo, void *addr) 62 { 63 struct tegra_bo *obj = host1x_to_tegra_bo(bo); 64 65 if (obj->vaddr) 66 return; 67 else if (obj->gem.import_attach) 68 dma_buf_vunmap(obj->gem.import_attach->dmabuf, addr); 69 else 70 vunmap(addr); 71 } 72 73 static void *tegra_bo_kmap(struct host1x_bo *bo, unsigned int page) 74 { 75 struct tegra_bo *obj = host1x_to_tegra_bo(bo); 76 77 if (obj->vaddr) 78 return obj->vaddr + page * PAGE_SIZE; 79 else if (obj->gem.import_attach) 80 return dma_buf_kmap(obj->gem.import_attach->dmabuf, page); 81 else 82 return vmap(obj->pages + page, 1, VM_MAP, 83 pgprot_writecombine(PAGE_KERNEL)); 84 } 85 86 static void tegra_bo_kunmap(struct host1x_bo *bo, unsigned int page, 87 void *addr) 88 { 89 struct tegra_bo *obj = host1x_to_tegra_bo(bo); 90 91 if (obj->vaddr) 92 return; 93 else if (obj->gem.import_attach) 94 dma_buf_kunmap(obj->gem.import_attach->dmabuf, page, addr); 95 else 96 vunmap(addr); 97 } 98 99 static struct host1x_bo *tegra_bo_get(struct host1x_bo *bo) 100 { 101 struct tegra_bo *obj = host1x_to_tegra_bo(bo); 102 103 drm_gem_object_reference(&obj->gem); 104 105 return bo; 106 } 107 108 static const struct host1x_bo_ops tegra_bo_ops = { 109 .get = tegra_bo_get, 110 .put = tegra_bo_put, 111 .pin = tegra_bo_pin, 112 .unpin = tegra_bo_unpin, 113 .mmap = tegra_bo_mmap, 114 .munmap = tegra_bo_munmap, 115 .kmap = tegra_bo_kmap, 116 .kunmap = tegra_bo_kunmap, 117 }; 118 119 static int tegra_bo_iommu_map(struct tegra_drm *tegra, struct tegra_bo *bo) 120 { 121 int prot = IOMMU_READ | IOMMU_WRITE; 122 ssize_t err; 123 124 if (bo->mm) 125 return -EBUSY; 126 127 bo->mm = kzalloc(sizeof(*bo->mm), GFP_KERNEL); 128 if (!bo->mm) 129 return -ENOMEM; 130 131 mutex_lock(&tegra->mm_lock); 132 133 err = drm_mm_insert_node_generic(&tegra->mm, 134 bo->mm, bo->gem.size, PAGE_SIZE, 0, 0); 135 if (err < 0) { 136 dev_err(tegra->drm->dev, "out of I/O virtual memory: %zd\n", 137 err); 138 goto unlock; 139 } 140 141 bo->paddr = bo->mm->start; 142 143 err = iommu_map_sg(tegra->domain, bo->paddr, bo->sgt->sgl, 144 bo->sgt->nents, prot); 145 if (err < 0) { 146 dev_err(tegra->drm->dev, "failed to map buffer: %zd\n", err); 147 goto remove; 148 } 149 150 bo->size = err; 151 152 mutex_unlock(&tegra->mm_lock); 153 154 return 0; 155 156 remove: 157 drm_mm_remove_node(bo->mm); 158 unlock: 159 mutex_unlock(&tegra->mm_lock); 160 kfree(bo->mm); 161 return err; 162 } 163 164 static int tegra_bo_iommu_unmap(struct tegra_drm *tegra, struct tegra_bo *bo) 165 { 166 if (!bo->mm) 167 return 0; 168 169 mutex_lock(&tegra->mm_lock); 170 iommu_unmap(tegra->domain, bo->paddr, bo->size); 171 drm_mm_remove_node(bo->mm); 172 mutex_unlock(&tegra->mm_lock); 173 174 kfree(bo->mm); 175 176 return 0; 177 } 178 179 static struct tegra_bo *tegra_bo_alloc_object(struct drm_device *drm, 180 size_t size) 181 { 182 struct tegra_bo *bo; 183 int err; 184 185 bo = kzalloc(sizeof(*bo), GFP_KERNEL); 186 if (!bo) 187 return ERR_PTR(-ENOMEM); 188 189 host1x_bo_init(&bo->base, &tegra_bo_ops); 190 size = round_up(size, PAGE_SIZE); 191 192 err = drm_gem_object_init(drm, &bo->gem, size); 193 if (err < 0) 194 goto free; 195 196 err = drm_gem_create_mmap_offset(&bo->gem); 197 if (err < 0) 198 goto release; 199 200 return bo; 201 202 release: 203 drm_gem_object_release(&bo->gem); 204 free: 205 kfree(bo); 206 return ERR_PTR(err); 207 } 208 209 static void tegra_bo_free(struct drm_device *drm, struct tegra_bo *bo) 210 { 211 if (bo->pages) { 212 drm_gem_put_pages(&bo->gem, bo->pages, true, true); 213 sg_free_table(bo->sgt); 214 kfree(bo->sgt); 215 } else if (bo->vaddr) { 216 dma_free_wc(drm->dev, bo->gem.size, bo->vaddr, bo->paddr); 217 } 218 } 219 220 static int tegra_bo_get_pages(struct drm_device *drm, struct tegra_bo *bo) 221 { 222 struct scatterlist *s; 223 unsigned int i; 224 225 bo->pages = drm_gem_get_pages(&bo->gem); 226 if (IS_ERR(bo->pages)) 227 return PTR_ERR(bo->pages); 228 229 bo->num_pages = bo->gem.size >> PAGE_SHIFT; 230 231 bo->sgt = drm_prime_pages_to_sg(bo->pages, bo->num_pages); 232 if (IS_ERR(bo->sgt)) 233 goto put_pages; 234 235 /* 236 * Fake up the SG table so that dma_sync_sg_for_device() can be used 237 * to flush the pages associated with it. 238 * 239 * TODO: Replace this by drm_clflash_sg() once it can be implemented 240 * without relying on symbols that are not exported. 241 */ 242 for_each_sg(bo->sgt->sgl, s, bo->sgt->nents, i) 243 sg_dma_address(s) = sg_phys(s); 244 245 dma_sync_sg_for_device(drm->dev, bo->sgt->sgl, bo->sgt->nents, 246 DMA_TO_DEVICE); 247 248 return 0; 249 250 put_pages: 251 drm_gem_put_pages(&bo->gem, bo->pages, false, false); 252 return PTR_ERR(bo->sgt); 253 } 254 255 static int tegra_bo_alloc(struct drm_device *drm, struct tegra_bo *bo) 256 { 257 struct tegra_drm *tegra = drm->dev_private; 258 int err; 259 260 if (tegra->domain) { 261 err = tegra_bo_get_pages(drm, bo); 262 if (err < 0) 263 return err; 264 265 err = tegra_bo_iommu_map(tegra, bo); 266 if (err < 0) { 267 tegra_bo_free(drm, bo); 268 return err; 269 } 270 } else { 271 size_t size = bo->gem.size; 272 273 bo->vaddr = dma_alloc_wc(drm->dev, size, &bo->paddr, 274 GFP_KERNEL | __GFP_NOWARN); 275 if (!bo->vaddr) { 276 dev_err(drm->dev, 277 "failed to allocate buffer of size %zu\n", 278 size); 279 return -ENOMEM; 280 } 281 } 282 283 return 0; 284 } 285 286 struct tegra_bo *tegra_bo_create(struct drm_device *drm, size_t size, 287 unsigned long flags) 288 { 289 struct tegra_bo *bo; 290 int err; 291 292 bo = tegra_bo_alloc_object(drm, size); 293 if (IS_ERR(bo)) 294 return bo; 295 296 err = tegra_bo_alloc(drm, bo); 297 if (err < 0) 298 goto release; 299 300 if (flags & DRM_TEGRA_GEM_CREATE_TILED) 301 bo->tiling.mode = TEGRA_BO_TILING_MODE_TILED; 302 303 if (flags & DRM_TEGRA_GEM_CREATE_BOTTOM_UP) 304 bo->flags |= TEGRA_BO_BOTTOM_UP; 305 306 return bo; 307 308 release: 309 drm_gem_object_release(&bo->gem); 310 kfree(bo); 311 return ERR_PTR(err); 312 } 313 314 struct tegra_bo *tegra_bo_create_with_handle(struct drm_file *file, 315 struct drm_device *drm, 316 size_t size, 317 unsigned long flags, 318 u32 *handle) 319 { 320 struct tegra_bo *bo; 321 int err; 322 323 bo = tegra_bo_create(drm, size, flags); 324 if (IS_ERR(bo)) 325 return bo; 326 327 err = drm_gem_handle_create(file, &bo->gem, handle); 328 if (err) { 329 tegra_bo_free_object(&bo->gem); 330 return ERR_PTR(err); 331 } 332 333 drm_gem_object_unreference_unlocked(&bo->gem); 334 335 return bo; 336 } 337 338 static struct tegra_bo *tegra_bo_import(struct drm_device *drm, 339 struct dma_buf *buf) 340 { 341 struct tegra_drm *tegra = drm->dev_private; 342 struct dma_buf_attachment *attach; 343 struct tegra_bo *bo; 344 int err; 345 346 bo = tegra_bo_alloc_object(drm, buf->size); 347 if (IS_ERR(bo)) 348 return bo; 349 350 attach = dma_buf_attach(buf, drm->dev); 351 if (IS_ERR(attach)) { 352 err = PTR_ERR(attach); 353 goto free; 354 } 355 356 get_dma_buf(buf); 357 358 bo->sgt = dma_buf_map_attachment(attach, DMA_TO_DEVICE); 359 if (IS_ERR(bo->sgt)) { 360 err = PTR_ERR(bo->sgt); 361 goto detach; 362 } 363 364 if (tegra->domain) { 365 err = tegra_bo_iommu_map(tegra, bo); 366 if (err < 0) 367 goto detach; 368 } else { 369 if (bo->sgt->nents > 1) { 370 err = -EINVAL; 371 goto detach; 372 } 373 374 bo->paddr = sg_dma_address(bo->sgt->sgl); 375 } 376 377 bo->gem.import_attach = attach; 378 379 return bo; 380 381 detach: 382 if (!IS_ERR_OR_NULL(bo->sgt)) 383 dma_buf_unmap_attachment(attach, bo->sgt, DMA_TO_DEVICE); 384 385 dma_buf_detach(buf, attach); 386 dma_buf_put(buf); 387 free: 388 drm_gem_object_release(&bo->gem); 389 kfree(bo); 390 return ERR_PTR(err); 391 } 392 393 void tegra_bo_free_object(struct drm_gem_object *gem) 394 { 395 struct tegra_drm *tegra = gem->dev->dev_private; 396 struct tegra_bo *bo = to_tegra_bo(gem); 397 398 if (tegra->domain) 399 tegra_bo_iommu_unmap(tegra, bo); 400 401 if (gem->import_attach) { 402 dma_buf_unmap_attachment(gem->import_attach, bo->sgt, 403 DMA_TO_DEVICE); 404 drm_prime_gem_destroy(gem, NULL); 405 } else { 406 tegra_bo_free(gem->dev, bo); 407 } 408 409 drm_gem_object_release(gem); 410 kfree(bo); 411 } 412 413 int tegra_bo_dumb_create(struct drm_file *file, struct drm_device *drm, 414 struct drm_mode_create_dumb *args) 415 { 416 unsigned int min_pitch = DIV_ROUND_UP(args->width * args->bpp, 8); 417 struct tegra_drm *tegra = drm->dev_private; 418 struct tegra_bo *bo; 419 420 args->pitch = round_up(min_pitch, tegra->pitch_align); 421 args->size = args->pitch * args->height; 422 423 bo = tegra_bo_create_with_handle(file, drm, args->size, 0, 424 &args->handle); 425 if (IS_ERR(bo)) 426 return PTR_ERR(bo); 427 428 return 0; 429 } 430 431 int tegra_bo_dumb_map_offset(struct drm_file *file, struct drm_device *drm, 432 u32 handle, u64 *offset) 433 { 434 struct drm_gem_object *gem; 435 struct tegra_bo *bo; 436 437 gem = drm_gem_object_lookup(file, handle); 438 if (!gem) { 439 dev_err(drm->dev, "failed to lookup GEM object\n"); 440 return -EINVAL; 441 } 442 443 bo = to_tegra_bo(gem); 444 445 *offset = drm_vma_node_offset_addr(&bo->gem.vma_node); 446 447 drm_gem_object_unreference_unlocked(gem); 448 449 return 0; 450 } 451 452 static int tegra_bo_fault(struct vm_fault *vmf) 453 { 454 struct vm_area_struct *vma = vmf->vma; 455 struct drm_gem_object *gem = vma->vm_private_data; 456 struct tegra_bo *bo = to_tegra_bo(gem); 457 struct page *page; 458 pgoff_t offset; 459 int err; 460 461 if (!bo->pages) 462 return VM_FAULT_SIGBUS; 463 464 offset = (vmf->address - vma->vm_start) >> PAGE_SHIFT; 465 page = bo->pages[offset]; 466 467 err = vm_insert_page(vma, vmf->address, page); 468 switch (err) { 469 case -EAGAIN: 470 case 0: 471 case -ERESTARTSYS: 472 case -EINTR: 473 case -EBUSY: 474 return VM_FAULT_NOPAGE; 475 476 case -ENOMEM: 477 return VM_FAULT_OOM; 478 } 479 480 return VM_FAULT_SIGBUS; 481 } 482 483 const struct vm_operations_struct tegra_bo_vm_ops = { 484 .fault = tegra_bo_fault, 485 .open = drm_gem_vm_open, 486 .close = drm_gem_vm_close, 487 }; 488 489 int tegra_drm_mmap(struct file *file, struct vm_area_struct *vma) 490 { 491 struct drm_gem_object *gem; 492 struct tegra_bo *bo; 493 int ret; 494 495 ret = drm_gem_mmap(file, vma); 496 if (ret) 497 return ret; 498 499 gem = vma->vm_private_data; 500 bo = to_tegra_bo(gem); 501 502 if (!bo->pages) { 503 unsigned long vm_pgoff = vma->vm_pgoff; 504 505 vma->vm_flags &= ~VM_PFNMAP; 506 vma->vm_pgoff = 0; 507 508 ret = dma_mmap_wc(gem->dev->dev, vma, bo->vaddr, bo->paddr, 509 gem->size); 510 if (ret) { 511 drm_gem_vm_close(vma); 512 return ret; 513 } 514 515 vma->vm_pgoff = vm_pgoff; 516 } else { 517 pgprot_t prot = vm_get_page_prot(vma->vm_flags); 518 519 vma->vm_flags |= VM_MIXEDMAP; 520 vma->vm_flags &= ~VM_PFNMAP; 521 522 vma->vm_page_prot = pgprot_writecombine(prot); 523 } 524 525 return 0; 526 } 527 528 static struct sg_table * 529 tegra_gem_prime_map_dma_buf(struct dma_buf_attachment *attach, 530 enum dma_data_direction dir) 531 { 532 struct drm_gem_object *gem = attach->dmabuf->priv; 533 struct tegra_bo *bo = to_tegra_bo(gem); 534 struct sg_table *sgt; 535 536 sgt = kmalloc(sizeof(*sgt), GFP_KERNEL); 537 if (!sgt) 538 return NULL; 539 540 if (bo->pages) { 541 struct scatterlist *sg; 542 unsigned int i; 543 544 if (sg_alloc_table(sgt, bo->num_pages, GFP_KERNEL)) 545 goto free; 546 547 for_each_sg(sgt->sgl, sg, bo->num_pages, i) 548 sg_set_page(sg, bo->pages[i], PAGE_SIZE, 0); 549 550 if (dma_map_sg(attach->dev, sgt->sgl, sgt->nents, dir) == 0) 551 goto free; 552 } else { 553 if (sg_alloc_table(sgt, 1, GFP_KERNEL)) 554 goto free; 555 556 sg_dma_address(sgt->sgl) = bo->paddr; 557 sg_dma_len(sgt->sgl) = gem->size; 558 } 559 560 return sgt; 561 562 free: 563 sg_free_table(sgt); 564 kfree(sgt); 565 return NULL; 566 } 567 568 static void tegra_gem_prime_unmap_dma_buf(struct dma_buf_attachment *attach, 569 struct sg_table *sgt, 570 enum dma_data_direction dir) 571 { 572 struct drm_gem_object *gem = attach->dmabuf->priv; 573 struct tegra_bo *bo = to_tegra_bo(gem); 574 575 if (bo->pages) 576 dma_unmap_sg(attach->dev, sgt->sgl, sgt->nents, dir); 577 578 sg_free_table(sgt); 579 kfree(sgt); 580 } 581 582 static void tegra_gem_prime_release(struct dma_buf *buf) 583 { 584 drm_gem_dmabuf_release(buf); 585 } 586 587 static void *tegra_gem_prime_kmap_atomic(struct dma_buf *buf, 588 unsigned long page) 589 { 590 return NULL; 591 } 592 593 static void tegra_gem_prime_kunmap_atomic(struct dma_buf *buf, 594 unsigned long page, 595 void *addr) 596 { 597 } 598 599 static void *tegra_gem_prime_kmap(struct dma_buf *buf, unsigned long page) 600 { 601 return NULL; 602 } 603 604 static void tegra_gem_prime_kunmap(struct dma_buf *buf, unsigned long page, 605 void *addr) 606 { 607 } 608 609 static int tegra_gem_prime_mmap(struct dma_buf *buf, struct vm_area_struct *vma) 610 { 611 return -EINVAL; 612 } 613 614 static void *tegra_gem_prime_vmap(struct dma_buf *buf) 615 { 616 struct drm_gem_object *gem = buf->priv; 617 struct tegra_bo *bo = to_tegra_bo(gem); 618 619 return bo->vaddr; 620 } 621 622 static void tegra_gem_prime_vunmap(struct dma_buf *buf, void *vaddr) 623 { 624 } 625 626 static const struct dma_buf_ops tegra_gem_prime_dmabuf_ops = { 627 .map_dma_buf = tegra_gem_prime_map_dma_buf, 628 .unmap_dma_buf = tegra_gem_prime_unmap_dma_buf, 629 .release = tegra_gem_prime_release, 630 .map_atomic = tegra_gem_prime_kmap_atomic, 631 .unmap_atomic = tegra_gem_prime_kunmap_atomic, 632 .map = tegra_gem_prime_kmap, 633 .unmap = tegra_gem_prime_kunmap, 634 .mmap = tegra_gem_prime_mmap, 635 .vmap = tegra_gem_prime_vmap, 636 .vunmap = tegra_gem_prime_vunmap, 637 }; 638 639 struct dma_buf *tegra_gem_prime_export(struct drm_device *drm, 640 struct drm_gem_object *gem, 641 int flags) 642 { 643 DEFINE_DMA_BUF_EXPORT_INFO(exp_info); 644 645 exp_info.ops = &tegra_gem_prime_dmabuf_ops; 646 exp_info.size = gem->size; 647 exp_info.flags = flags; 648 exp_info.priv = gem; 649 650 return drm_gem_dmabuf_export(drm, &exp_info); 651 } 652 653 struct drm_gem_object *tegra_gem_prime_import(struct drm_device *drm, 654 struct dma_buf *buf) 655 { 656 struct tegra_bo *bo; 657 658 if (buf->ops == &tegra_gem_prime_dmabuf_ops) { 659 struct drm_gem_object *gem = buf->priv; 660 661 if (gem->dev == drm) { 662 drm_gem_object_reference(gem); 663 return gem; 664 } 665 } 666 667 bo = tegra_bo_import(drm, buf); 668 if (IS_ERR(bo)) 669 return ERR_CAST(bo); 670 671 return &bo->gem; 672 } 673