1 /* 2 * Copyright (C) 2013 Red Hat 3 * Author: Rob Clark <robdclark@gmail.com> 4 * 5 * This program is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 as published by 7 * the Free Software Foundation. 8 * 9 * This program is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 12 * more details. 13 * 14 * You should have received a copy of the GNU General Public License along with 15 * this program. If not, see <http://www.gnu.org/licenses/>. 16 */ 17 18 #include <linux/spinlock.h> 19 #include <linux/shmem_fs.h> 20 #include <linux/dma-buf.h> 21 #include <linux/pfn_t.h> 22 23 #include "msm_drv.h" 24 #include "msm_fence.h" 25 #include "msm_gem.h" 26 #include "msm_gpu.h" 27 #include "msm_mmu.h" 28 29 static dma_addr_t physaddr(struct drm_gem_object *obj) 30 { 31 struct msm_gem_object *msm_obj = to_msm_bo(obj); 32 struct msm_drm_private *priv = obj->dev->dev_private; 33 return (((dma_addr_t)msm_obj->vram_node->start) << PAGE_SHIFT) + 34 priv->vram.paddr; 35 } 36 37 static bool use_pages(struct drm_gem_object *obj) 38 { 39 struct msm_gem_object *msm_obj = to_msm_bo(obj); 40 return !msm_obj->vram_node; 41 } 42 43 /* allocate pages from VRAM carveout, used when no IOMMU: */ 44 static struct page **get_pages_vram(struct drm_gem_object *obj, 45 int npages) 46 { 47 struct msm_gem_object *msm_obj = to_msm_bo(obj); 48 struct msm_drm_private *priv = obj->dev->dev_private; 49 dma_addr_t paddr; 50 struct page **p; 51 int ret, i; 52 53 p = drm_malloc_ab(npages, sizeof(struct page *)); 54 if (!p) 55 return ERR_PTR(-ENOMEM); 56 57 ret = drm_mm_insert_node(&priv->vram.mm, msm_obj->vram_node, 58 npages, 0, DRM_MM_SEARCH_DEFAULT); 59 if (ret) { 60 drm_free_large(p); 61 return ERR_PTR(ret); 62 } 63 64 paddr = physaddr(obj); 65 for (i = 0; i < npages; i++) { 66 p[i] = phys_to_page(paddr); 67 paddr += PAGE_SIZE; 68 } 69 70 return p; 71 } 72 73 /* called with dev->struct_mutex held */ 74 static struct page **get_pages(struct drm_gem_object *obj) 75 { 76 struct msm_gem_object *msm_obj = to_msm_bo(obj); 77 78 if (!msm_obj->pages) { 79 struct drm_device *dev = obj->dev; 80 struct page **p; 81 int npages = obj->size >> PAGE_SHIFT; 82 83 if (use_pages(obj)) 84 p = drm_gem_get_pages(obj); 85 else 86 p = get_pages_vram(obj, npages); 87 88 if (IS_ERR(p)) { 89 dev_err(dev->dev, "could not get pages: %ld\n", 90 PTR_ERR(p)); 91 return p; 92 } 93 94 msm_obj->sgt = drm_prime_pages_to_sg(p, npages); 95 if (IS_ERR(msm_obj->sgt)) { 96 dev_err(dev->dev, "failed to allocate sgt\n"); 97 return ERR_CAST(msm_obj->sgt); 98 } 99 100 msm_obj->pages = p; 101 102 /* For non-cached buffers, ensure the new pages are clean 103 * because display controller, GPU, etc. are not coherent: 104 */ 105 if (msm_obj->flags & (MSM_BO_WC|MSM_BO_UNCACHED)) 106 dma_map_sg(dev->dev, msm_obj->sgt->sgl, 107 msm_obj->sgt->nents, DMA_BIDIRECTIONAL); 108 } 109 110 return msm_obj->pages; 111 } 112 113 static void put_pages(struct drm_gem_object *obj) 114 { 115 struct msm_gem_object *msm_obj = to_msm_bo(obj); 116 117 if (msm_obj->pages) { 118 /* For non-cached buffers, ensure the new pages are clean 119 * because display controller, GPU, etc. are not coherent: 120 */ 121 if (msm_obj->flags & (MSM_BO_WC|MSM_BO_UNCACHED)) 122 dma_unmap_sg(obj->dev->dev, msm_obj->sgt->sgl, 123 msm_obj->sgt->nents, DMA_BIDIRECTIONAL); 124 sg_free_table(msm_obj->sgt); 125 kfree(msm_obj->sgt); 126 127 if (use_pages(obj)) 128 drm_gem_put_pages(obj, msm_obj->pages, true, false); 129 else { 130 drm_mm_remove_node(msm_obj->vram_node); 131 drm_free_large(msm_obj->pages); 132 } 133 134 msm_obj->pages = NULL; 135 } 136 } 137 138 struct page **msm_gem_get_pages(struct drm_gem_object *obj) 139 { 140 struct drm_device *dev = obj->dev; 141 struct page **p; 142 mutex_lock(&dev->struct_mutex); 143 p = get_pages(obj); 144 mutex_unlock(&dev->struct_mutex); 145 return p; 146 } 147 148 void msm_gem_put_pages(struct drm_gem_object *obj) 149 { 150 /* when we start tracking the pin count, then do something here */ 151 } 152 153 int msm_gem_mmap_obj(struct drm_gem_object *obj, 154 struct vm_area_struct *vma) 155 { 156 struct msm_gem_object *msm_obj = to_msm_bo(obj); 157 158 vma->vm_flags &= ~VM_PFNMAP; 159 vma->vm_flags |= VM_MIXEDMAP; 160 161 if (msm_obj->flags & MSM_BO_WC) { 162 vma->vm_page_prot = pgprot_writecombine(vm_get_page_prot(vma->vm_flags)); 163 } else if (msm_obj->flags & MSM_BO_UNCACHED) { 164 vma->vm_page_prot = pgprot_noncached(vm_get_page_prot(vma->vm_flags)); 165 } else { 166 /* 167 * Shunt off cached objs to shmem file so they have their own 168 * address_space (so unmap_mapping_range does what we want, 169 * in particular in the case of mmap'd dmabufs) 170 */ 171 fput(vma->vm_file); 172 get_file(obj->filp); 173 vma->vm_pgoff = 0; 174 vma->vm_file = obj->filp; 175 176 vma->vm_page_prot = vm_get_page_prot(vma->vm_flags); 177 } 178 179 return 0; 180 } 181 182 int msm_gem_mmap(struct file *filp, struct vm_area_struct *vma) 183 { 184 int ret; 185 186 ret = drm_gem_mmap(filp, vma); 187 if (ret) { 188 DBG("mmap failed: %d", ret); 189 return ret; 190 } 191 192 return msm_gem_mmap_obj(vma->vm_private_data, vma); 193 } 194 195 int msm_gem_fault(struct vm_area_struct *vma, struct vm_fault *vmf) 196 { 197 struct drm_gem_object *obj = vma->vm_private_data; 198 struct drm_device *dev = obj->dev; 199 struct page **pages; 200 unsigned long pfn; 201 pgoff_t pgoff; 202 int ret; 203 204 /* Make sure we don't parallel update on a fault, nor move or remove 205 * something from beneath our feet 206 */ 207 ret = mutex_lock_interruptible(&dev->struct_mutex); 208 if (ret) 209 goto out; 210 211 /* make sure we have pages attached now */ 212 pages = get_pages(obj); 213 if (IS_ERR(pages)) { 214 ret = PTR_ERR(pages); 215 goto out_unlock; 216 } 217 218 /* We don't use vmf->pgoff since that has the fake offset: */ 219 pgoff = ((unsigned long)vmf->virtual_address - 220 vma->vm_start) >> PAGE_SHIFT; 221 222 pfn = page_to_pfn(pages[pgoff]); 223 224 VERB("Inserting %p pfn %lx, pa %lx", vmf->virtual_address, 225 pfn, pfn << PAGE_SHIFT); 226 227 ret = vm_insert_mixed(vma, (unsigned long)vmf->virtual_address, 228 __pfn_to_pfn_t(pfn, PFN_DEV)); 229 230 out_unlock: 231 mutex_unlock(&dev->struct_mutex); 232 out: 233 switch (ret) { 234 case -EAGAIN: 235 case 0: 236 case -ERESTARTSYS: 237 case -EINTR: 238 case -EBUSY: 239 /* 240 * EBUSY is ok: this just means that another thread 241 * already did the job. 242 */ 243 return VM_FAULT_NOPAGE; 244 case -ENOMEM: 245 return VM_FAULT_OOM; 246 default: 247 return VM_FAULT_SIGBUS; 248 } 249 } 250 251 /** get mmap offset */ 252 static uint64_t mmap_offset(struct drm_gem_object *obj) 253 { 254 struct drm_device *dev = obj->dev; 255 int ret; 256 257 WARN_ON(!mutex_is_locked(&dev->struct_mutex)); 258 259 /* Make it mmapable */ 260 ret = drm_gem_create_mmap_offset(obj); 261 262 if (ret) { 263 dev_err(dev->dev, "could not allocate mmap offset\n"); 264 return 0; 265 } 266 267 return drm_vma_node_offset_addr(&obj->vma_node); 268 } 269 270 uint64_t msm_gem_mmap_offset(struct drm_gem_object *obj) 271 { 272 uint64_t offset; 273 mutex_lock(&obj->dev->struct_mutex); 274 offset = mmap_offset(obj); 275 mutex_unlock(&obj->dev->struct_mutex); 276 return offset; 277 } 278 279 /* should be called under struct_mutex.. although it can be called 280 * from atomic context without struct_mutex to acquire an extra 281 * iova ref if you know one is already held. 282 * 283 * That means when I do eventually need to add support for unpinning 284 * the refcnt counter needs to be atomic_t. 285 */ 286 int msm_gem_get_iova_locked(struct drm_gem_object *obj, int id, 287 uint32_t *iova) 288 { 289 struct msm_gem_object *msm_obj = to_msm_bo(obj); 290 int ret = 0; 291 292 if (!msm_obj->domain[id].iova) { 293 struct msm_drm_private *priv = obj->dev->dev_private; 294 struct page **pages = get_pages(obj); 295 296 if (IS_ERR(pages)) 297 return PTR_ERR(pages); 298 299 if (iommu_present(&platform_bus_type)) { 300 struct msm_mmu *mmu = priv->mmus[id]; 301 uint32_t offset; 302 303 if (WARN_ON(!mmu)) 304 return -EINVAL; 305 306 offset = (uint32_t)mmap_offset(obj); 307 ret = mmu->funcs->map(mmu, offset, msm_obj->sgt, 308 obj->size, IOMMU_READ | IOMMU_WRITE); 309 msm_obj->domain[id].iova = offset; 310 } else { 311 msm_obj->domain[id].iova = physaddr(obj); 312 } 313 } 314 315 if (!ret) 316 *iova = msm_obj->domain[id].iova; 317 318 return ret; 319 } 320 321 /* get iova, taking a reference. Should have a matching put */ 322 int msm_gem_get_iova(struct drm_gem_object *obj, int id, uint32_t *iova) 323 { 324 struct msm_gem_object *msm_obj = to_msm_bo(obj); 325 int ret; 326 327 /* this is safe right now because we don't unmap until the 328 * bo is deleted: 329 */ 330 if (msm_obj->domain[id].iova) { 331 *iova = msm_obj->domain[id].iova; 332 return 0; 333 } 334 335 mutex_lock(&obj->dev->struct_mutex); 336 ret = msm_gem_get_iova_locked(obj, id, iova); 337 mutex_unlock(&obj->dev->struct_mutex); 338 return ret; 339 } 340 341 /* get iova without taking a reference, used in places where you have 342 * already done a 'msm_gem_get_iova()'. 343 */ 344 uint32_t msm_gem_iova(struct drm_gem_object *obj, int id) 345 { 346 struct msm_gem_object *msm_obj = to_msm_bo(obj); 347 WARN_ON(!msm_obj->domain[id].iova); 348 return msm_obj->domain[id].iova; 349 } 350 351 void msm_gem_put_iova(struct drm_gem_object *obj, int id) 352 { 353 // XXX TODO .. 354 // NOTE: probably don't need a _locked() version.. we wouldn't 355 // normally unmap here, but instead just mark that it could be 356 // unmapped (if the iova refcnt drops to zero), but then later 357 // if another _get_iova_locked() fails we can start unmapping 358 // things that are no longer needed.. 359 } 360 361 int msm_gem_dumb_create(struct drm_file *file, struct drm_device *dev, 362 struct drm_mode_create_dumb *args) 363 { 364 args->pitch = align_pitch(args->width, args->bpp); 365 args->size = PAGE_ALIGN(args->pitch * args->height); 366 return msm_gem_new_handle(dev, file, args->size, 367 MSM_BO_SCANOUT | MSM_BO_WC, &args->handle); 368 } 369 370 int msm_gem_dumb_map_offset(struct drm_file *file, struct drm_device *dev, 371 uint32_t handle, uint64_t *offset) 372 { 373 struct drm_gem_object *obj; 374 int ret = 0; 375 376 /* GEM does all our handle to object mapping */ 377 obj = drm_gem_object_lookup(file, handle); 378 if (obj == NULL) { 379 ret = -ENOENT; 380 goto fail; 381 } 382 383 *offset = msm_gem_mmap_offset(obj); 384 385 drm_gem_object_unreference_unlocked(obj); 386 387 fail: 388 return ret; 389 } 390 391 void *msm_gem_vaddr_locked(struct drm_gem_object *obj) 392 { 393 struct msm_gem_object *msm_obj = to_msm_bo(obj); 394 WARN_ON(!mutex_is_locked(&obj->dev->struct_mutex)); 395 if (!msm_obj->vaddr) { 396 struct page **pages = get_pages(obj); 397 if (IS_ERR(pages)) 398 return ERR_CAST(pages); 399 msm_obj->vaddr = vmap(pages, obj->size >> PAGE_SHIFT, 400 VM_MAP, pgprot_writecombine(PAGE_KERNEL)); 401 if (msm_obj->vaddr == NULL) 402 return ERR_PTR(-ENOMEM); 403 } 404 return msm_obj->vaddr; 405 } 406 407 void *msm_gem_vaddr(struct drm_gem_object *obj) 408 { 409 void *ret; 410 mutex_lock(&obj->dev->struct_mutex); 411 ret = msm_gem_vaddr_locked(obj); 412 mutex_unlock(&obj->dev->struct_mutex); 413 return ret; 414 } 415 416 /* must be called before _move_to_active().. */ 417 int msm_gem_sync_object(struct drm_gem_object *obj, 418 struct msm_fence_context *fctx, bool exclusive) 419 { 420 struct msm_gem_object *msm_obj = to_msm_bo(obj); 421 struct reservation_object_list *fobj; 422 struct fence *fence; 423 int i, ret; 424 425 if (!exclusive) { 426 /* NOTE: _reserve_shared() must happen before _add_shared_fence(), 427 * which makes this a slightly strange place to call it. OTOH this 428 * is a convenient can-fail point to hook it in. (And similar to 429 * how etnaviv and nouveau handle this.) 430 */ 431 ret = reservation_object_reserve_shared(msm_obj->resv); 432 if (ret) 433 return ret; 434 } 435 436 fobj = reservation_object_get_list(msm_obj->resv); 437 if (!fobj || (fobj->shared_count == 0)) { 438 fence = reservation_object_get_excl(msm_obj->resv); 439 /* don't need to wait on our own fences, since ring is fifo */ 440 if (fence && (fence->context != fctx->context)) { 441 ret = fence_wait(fence, true); 442 if (ret) 443 return ret; 444 } 445 } 446 447 if (!exclusive || !fobj) 448 return 0; 449 450 for (i = 0; i < fobj->shared_count; i++) { 451 fence = rcu_dereference_protected(fobj->shared[i], 452 reservation_object_held(msm_obj->resv)); 453 if (fence->context != fctx->context) { 454 ret = fence_wait(fence, true); 455 if (ret) 456 return ret; 457 } 458 } 459 460 return 0; 461 } 462 463 void msm_gem_move_to_active(struct drm_gem_object *obj, 464 struct msm_gpu *gpu, bool exclusive, struct fence *fence) 465 { 466 struct msm_gem_object *msm_obj = to_msm_bo(obj); 467 msm_obj->gpu = gpu; 468 if (exclusive) 469 reservation_object_add_excl_fence(msm_obj->resv, fence); 470 else 471 reservation_object_add_shared_fence(msm_obj->resv, fence); 472 list_del_init(&msm_obj->mm_list); 473 list_add_tail(&msm_obj->mm_list, &gpu->active_list); 474 } 475 476 void msm_gem_move_to_inactive(struct drm_gem_object *obj) 477 { 478 struct drm_device *dev = obj->dev; 479 struct msm_drm_private *priv = dev->dev_private; 480 struct msm_gem_object *msm_obj = to_msm_bo(obj); 481 482 WARN_ON(!mutex_is_locked(&dev->struct_mutex)); 483 484 msm_obj->gpu = NULL; 485 list_del_init(&msm_obj->mm_list); 486 list_add_tail(&msm_obj->mm_list, &priv->inactive_list); 487 } 488 489 int msm_gem_cpu_prep(struct drm_gem_object *obj, uint32_t op, ktime_t *timeout) 490 { 491 struct msm_gem_object *msm_obj = to_msm_bo(obj); 492 bool write = !!(op & MSM_PREP_WRITE); 493 494 if (op & MSM_PREP_NOSYNC) { 495 if (!reservation_object_test_signaled_rcu(msm_obj->resv, write)) 496 return -EBUSY; 497 } else { 498 int ret; 499 500 ret = reservation_object_wait_timeout_rcu(msm_obj->resv, write, 501 true, timeout_to_jiffies(timeout)); 502 if (ret <= 0) 503 return ret == 0 ? -ETIMEDOUT : ret; 504 } 505 506 /* TODO cache maintenance */ 507 508 return 0; 509 } 510 511 int msm_gem_cpu_fini(struct drm_gem_object *obj) 512 { 513 /* TODO cache maintenance */ 514 return 0; 515 } 516 517 #ifdef CONFIG_DEBUG_FS 518 static void describe_fence(struct fence *fence, const char *type, 519 struct seq_file *m) 520 { 521 if (!fence_is_signaled(fence)) 522 seq_printf(m, "\t%9s: %s %s seq %u\n", type, 523 fence->ops->get_driver_name(fence), 524 fence->ops->get_timeline_name(fence), 525 fence->seqno); 526 } 527 528 void msm_gem_describe(struct drm_gem_object *obj, struct seq_file *m) 529 { 530 struct msm_gem_object *msm_obj = to_msm_bo(obj); 531 struct reservation_object *robj = msm_obj->resv; 532 struct reservation_object_list *fobj; 533 struct fence *fence; 534 uint64_t off = drm_vma_node_start(&obj->vma_node); 535 536 WARN_ON(!mutex_is_locked(&obj->dev->struct_mutex)); 537 538 seq_printf(m, "%08x: %c %2d (%2d) %08llx %p %zu\n", 539 msm_obj->flags, is_active(msm_obj) ? 'A' : 'I', 540 obj->name, obj->refcount.refcount.counter, 541 off, msm_obj->vaddr, obj->size); 542 543 rcu_read_lock(); 544 fobj = rcu_dereference(robj->fence); 545 if (fobj) { 546 unsigned int i, shared_count = fobj->shared_count; 547 548 for (i = 0; i < shared_count; i++) { 549 fence = rcu_dereference(fobj->shared[i]); 550 describe_fence(fence, "Shared", m); 551 } 552 } 553 554 fence = rcu_dereference(robj->fence_excl); 555 if (fence) 556 describe_fence(fence, "Exclusive", m); 557 rcu_read_unlock(); 558 } 559 560 void msm_gem_describe_objects(struct list_head *list, struct seq_file *m) 561 { 562 struct msm_gem_object *msm_obj; 563 int count = 0; 564 size_t size = 0; 565 566 list_for_each_entry(msm_obj, list, mm_list) { 567 struct drm_gem_object *obj = &msm_obj->base; 568 seq_printf(m, " "); 569 msm_gem_describe(obj, m); 570 count++; 571 size += obj->size; 572 } 573 574 seq_printf(m, "Total %d objects, %zu bytes\n", count, size); 575 } 576 #endif 577 578 void msm_gem_free_object(struct drm_gem_object *obj) 579 { 580 struct drm_device *dev = obj->dev; 581 struct msm_drm_private *priv = obj->dev->dev_private; 582 struct msm_gem_object *msm_obj = to_msm_bo(obj); 583 int id; 584 585 WARN_ON(!mutex_is_locked(&dev->struct_mutex)); 586 587 /* object should not be on active list: */ 588 WARN_ON(is_active(msm_obj)); 589 590 list_del(&msm_obj->mm_list); 591 592 for (id = 0; id < ARRAY_SIZE(msm_obj->domain); id++) { 593 struct msm_mmu *mmu = priv->mmus[id]; 594 if (mmu && msm_obj->domain[id].iova) { 595 uint32_t offset = msm_obj->domain[id].iova; 596 mmu->funcs->unmap(mmu, offset, msm_obj->sgt, obj->size); 597 } 598 } 599 600 if (obj->import_attach) { 601 if (msm_obj->vaddr) 602 dma_buf_vunmap(obj->import_attach->dmabuf, msm_obj->vaddr); 603 604 /* Don't drop the pages for imported dmabuf, as they are not 605 * ours, just free the array we allocated: 606 */ 607 if (msm_obj->pages) 608 drm_free_large(msm_obj->pages); 609 610 drm_prime_gem_destroy(obj, msm_obj->sgt); 611 } else { 612 vunmap(msm_obj->vaddr); 613 put_pages(obj); 614 } 615 616 if (msm_obj->resv == &msm_obj->_resv) 617 reservation_object_fini(msm_obj->resv); 618 619 drm_gem_object_release(obj); 620 621 kfree(msm_obj); 622 } 623 624 /* convenience method to construct a GEM buffer object, and userspace handle */ 625 int msm_gem_new_handle(struct drm_device *dev, struct drm_file *file, 626 uint32_t size, uint32_t flags, uint32_t *handle) 627 { 628 struct drm_gem_object *obj; 629 int ret; 630 631 ret = mutex_lock_interruptible(&dev->struct_mutex); 632 if (ret) 633 return ret; 634 635 obj = msm_gem_new(dev, size, flags); 636 637 mutex_unlock(&dev->struct_mutex); 638 639 if (IS_ERR(obj)) 640 return PTR_ERR(obj); 641 642 ret = drm_gem_handle_create(file, obj, handle); 643 644 /* drop reference from allocate - handle holds it now */ 645 drm_gem_object_unreference_unlocked(obj); 646 647 return ret; 648 } 649 650 static int msm_gem_new_impl(struct drm_device *dev, 651 uint32_t size, uint32_t flags, 652 struct reservation_object *resv, 653 struct drm_gem_object **obj) 654 { 655 struct msm_drm_private *priv = dev->dev_private; 656 struct msm_gem_object *msm_obj; 657 unsigned sz; 658 bool use_vram = false; 659 660 switch (flags & MSM_BO_CACHE_MASK) { 661 case MSM_BO_UNCACHED: 662 case MSM_BO_CACHED: 663 case MSM_BO_WC: 664 break; 665 default: 666 dev_err(dev->dev, "invalid cache flag: %x\n", 667 (flags & MSM_BO_CACHE_MASK)); 668 return -EINVAL; 669 } 670 671 if (!iommu_present(&platform_bus_type)) 672 use_vram = true; 673 else if ((flags & MSM_BO_STOLEN) && priv->vram.size) 674 use_vram = true; 675 676 if (WARN_ON(use_vram && !priv->vram.size)) 677 return -EINVAL; 678 679 sz = sizeof(*msm_obj); 680 if (use_vram) 681 sz += sizeof(struct drm_mm_node); 682 683 msm_obj = kzalloc(sz, GFP_KERNEL); 684 if (!msm_obj) 685 return -ENOMEM; 686 687 if (use_vram) 688 msm_obj->vram_node = (void *)&msm_obj[1]; 689 690 msm_obj->flags = flags; 691 692 if (resv) { 693 msm_obj->resv = resv; 694 } else { 695 msm_obj->resv = &msm_obj->_resv; 696 reservation_object_init(msm_obj->resv); 697 } 698 699 INIT_LIST_HEAD(&msm_obj->submit_entry); 700 list_add_tail(&msm_obj->mm_list, &priv->inactive_list); 701 702 *obj = &msm_obj->base; 703 704 return 0; 705 } 706 707 struct drm_gem_object *msm_gem_new(struct drm_device *dev, 708 uint32_t size, uint32_t flags) 709 { 710 struct drm_gem_object *obj = NULL; 711 int ret; 712 713 WARN_ON(!mutex_is_locked(&dev->struct_mutex)); 714 715 size = PAGE_ALIGN(size); 716 717 ret = msm_gem_new_impl(dev, size, flags, NULL, &obj); 718 if (ret) 719 goto fail; 720 721 if (use_pages(obj)) { 722 ret = drm_gem_object_init(dev, obj, size); 723 if (ret) 724 goto fail; 725 } else { 726 drm_gem_private_object_init(dev, obj, size); 727 } 728 729 return obj; 730 731 fail: 732 if (obj) 733 drm_gem_object_unreference(obj); 734 735 return ERR_PTR(ret); 736 } 737 738 struct drm_gem_object *msm_gem_import(struct drm_device *dev, 739 struct dma_buf *dmabuf, struct sg_table *sgt) 740 { 741 struct msm_gem_object *msm_obj; 742 struct drm_gem_object *obj; 743 uint32_t size; 744 int ret, npages; 745 746 /* if we don't have IOMMU, don't bother pretending we can import: */ 747 if (!iommu_present(&platform_bus_type)) { 748 dev_err(dev->dev, "cannot import without IOMMU\n"); 749 return ERR_PTR(-EINVAL); 750 } 751 752 size = PAGE_ALIGN(dmabuf->size); 753 754 ret = msm_gem_new_impl(dev, size, MSM_BO_WC, dmabuf->resv, &obj); 755 if (ret) 756 goto fail; 757 758 drm_gem_private_object_init(dev, obj, size); 759 760 npages = size / PAGE_SIZE; 761 762 msm_obj = to_msm_bo(obj); 763 msm_obj->sgt = sgt; 764 msm_obj->pages = drm_malloc_ab(npages, sizeof(struct page *)); 765 if (!msm_obj->pages) { 766 ret = -ENOMEM; 767 goto fail; 768 } 769 770 ret = drm_prime_sg_to_page_addr_arrays(sgt, msm_obj->pages, NULL, npages); 771 if (ret) 772 goto fail; 773 774 return obj; 775 776 fail: 777 if (obj) 778 drm_gem_object_unreference_unlocked(obj); 779 780 return ERR_PTR(ret); 781 } 782