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