1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Copyright (C) 2015-2018 Etnaviv Project 4 */ 5 6 #include <drm/drm_prime.h> 7 #include <linux/dma-mapping.h> 8 #include <linux/shmem_fs.h> 9 #include <linux/spinlock.h> 10 #include <linux/vmalloc.h> 11 12 #include "etnaviv_drv.h" 13 #include "etnaviv_gem.h" 14 #include "etnaviv_gpu.h" 15 #include "etnaviv_mmu.h" 16 17 static struct lock_class_key etnaviv_shm_lock_class; 18 static struct lock_class_key etnaviv_userptr_lock_class; 19 20 static void etnaviv_gem_scatter_map(struct etnaviv_gem_object *etnaviv_obj) 21 { 22 struct drm_device *dev = etnaviv_obj->base.dev; 23 struct sg_table *sgt = etnaviv_obj->sgt; 24 25 /* 26 * For non-cached buffers, ensure the new pages are clean 27 * because display controller, GPU, etc. are not coherent. 28 */ 29 if (etnaviv_obj->flags & ETNA_BO_CACHE_MASK) 30 dma_map_sgtable(dev->dev, sgt, DMA_BIDIRECTIONAL, 0); 31 } 32 33 static void etnaviv_gem_scatterlist_unmap(struct etnaviv_gem_object *etnaviv_obj) 34 { 35 struct drm_device *dev = etnaviv_obj->base.dev; 36 struct sg_table *sgt = etnaviv_obj->sgt; 37 38 /* 39 * For non-cached buffers, ensure the new pages are clean 40 * because display controller, GPU, etc. are not coherent: 41 * 42 * WARNING: The DMA API does not support concurrent CPU 43 * and device access to the memory area. With BIDIRECTIONAL, 44 * we will clean the cache lines which overlap the region, 45 * and invalidate all cache lines (partially) contained in 46 * the region. 47 * 48 * If you have dirty data in the overlapping cache lines, 49 * that will corrupt the GPU-written data. If you have 50 * written into the remainder of the region, this can 51 * discard those writes. 52 */ 53 if (etnaviv_obj->flags & ETNA_BO_CACHE_MASK) 54 dma_unmap_sgtable(dev->dev, sgt, DMA_BIDIRECTIONAL, 0); 55 } 56 57 /* called with etnaviv_obj->lock held */ 58 static int etnaviv_gem_shmem_get_pages(struct etnaviv_gem_object *etnaviv_obj) 59 { 60 struct drm_device *dev = etnaviv_obj->base.dev; 61 struct page **p = drm_gem_get_pages(&etnaviv_obj->base); 62 63 if (IS_ERR(p)) { 64 dev_dbg(dev->dev, "could not get pages: %ld\n", PTR_ERR(p)); 65 return PTR_ERR(p); 66 } 67 68 etnaviv_obj->pages = p; 69 70 return 0; 71 } 72 73 static void put_pages(struct etnaviv_gem_object *etnaviv_obj) 74 { 75 if (etnaviv_obj->sgt) { 76 etnaviv_gem_scatterlist_unmap(etnaviv_obj); 77 sg_free_table(etnaviv_obj->sgt); 78 kfree(etnaviv_obj->sgt); 79 etnaviv_obj->sgt = NULL; 80 } 81 if (etnaviv_obj->pages) { 82 drm_gem_put_pages(&etnaviv_obj->base, etnaviv_obj->pages, 83 true, false); 84 85 etnaviv_obj->pages = NULL; 86 } 87 } 88 89 struct page **etnaviv_gem_get_pages(struct etnaviv_gem_object *etnaviv_obj) 90 { 91 int ret; 92 93 lockdep_assert_held(&etnaviv_obj->lock); 94 95 if (!etnaviv_obj->pages) { 96 ret = etnaviv_obj->ops->get_pages(etnaviv_obj); 97 if (ret < 0) 98 return ERR_PTR(ret); 99 } 100 101 if (!etnaviv_obj->sgt) { 102 struct drm_device *dev = etnaviv_obj->base.dev; 103 int npages = etnaviv_obj->base.size >> PAGE_SHIFT; 104 struct sg_table *sgt; 105 106 sgt = drm_prime_pages_to_sg(etnaviv_obj->base.dev, 107 etnaviv_obj->pages, npages); 108 if (IS_ERR(sgt)) { 109 dev_err(dev->dev, "failed to allocate sgt: %ld\n", 110 PTR_ERR(sgt)); 111 return ERR_CAST(sgt); 112 } 113 114 etnaviv_obj->sgt = sgt; 115 116 etnaviv_gem_scatter_map(etnaviv_obj); 117 } 118 119 return etnaviv_obj->pages; 120 } 121 122 void etnaviv_gem_put_pages(struct etnaviv_gem_object *etnaviv_obj) 123 { 124 lockdep_assert_held(&etnaviv_obj->lock); 125 /* when we start tracking the pin count, then do something here */ 126 } 127 128 static int etnaviv_gem_mmap_obj(struct etnaviv_gem_object *etnaviv_obj, 129 struct vm_area_struct *vma) 130 { 131 pgprot_t vm_page_prot; 132 133 vma->vm_flags &= ~VM_PFNMAP; 134 vma->vm_flags |= VM_MIXEDMAP; 135 136 vm_page_prot = vm_get_page_prot(vma->vm_flags); 137 138 if (etnaviv_obj->flags & ETNA_BO_WC) { 139 vma->vm_page_prot = pgprot_writecombine(vm_page_prot); 140 } else if (etnaviv_obj->flags & ETNA_BO_UNCACHED) { 141 vma->vm_page_prot = pgprot_noncached(vm_page_prot); 142 } else { 143 /* 144 * Shunt off cached objs to shmem file so they have their own 145 * address_space (so unmap_mapping_range does what we want, 146 * in particular in the case of mmap'd dmabufs) 147 */ 148 fput(vma->vm_file); 149 get_file(etnaviv_obj->base.filp); 150 vma->vm_pgoff = 0; 151 vma->vm_file = etnaviv_obj->base.filp; 152 153 vma->vm_page_prot = vm_page_prot; 154 } 155 156 return 0; 157 } 158 159 int etnaviv_gem_mmap(struct file *filp, struct vm_area_struct *vma) 160 { 161 struct etnaviv_gem_object *obj; 162 int ret; 163 164 ret = drm_gem_mmap(filp, vma); 165 if (ret) { 166 DBG("mmap failed: %d", ret); 167 return ret; 168 } 169 170 obj = to_etnaviv_bo(vma->vm_private_data); 171 return obj->ops->mmap(obj, vma); 172 } 173 174 vm_fault_t etnaviv_gem_fault(struct vm_fault *vmf) 175 { 176 struct vm_area_struct *vma = vmf->vma; 177 struct drm_gem_object *obj = vma->vm_private_data; 178 struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj); 179 struct page **pages, *page; 180 pgoff_t pgoff; 181 int err; 182 183 /* 184 * Make sure we don't parallel update on a fault, nor move or remove 185 * something from beneath our feet. Note that vmf_insert_page() is 186 * specifically coded to take care of this, so we don't have to. 187 */ 188 err = mutex_lock_interruptible(&etnaviv_obj->lock); 189 if (err) 190 return VM_FAULT_NOPAGE; 191 /* make sure we have pages attached now */ 192 pages = etnaviv_gem_get_pages(etnaviv_obj); 193 mutex_unlock(&etnaviv_obj->lock); 194 195 if (IS_ERR(pages)) { 196 err = PTR_ERR(pages); 197 return vmf_error(err); 198 } 199 200 /* We don't use vmf->pgoff since that has the fake offset: */ 201 pgoff = (vmf->address - vma->vm_start) >> PAGE_SHIFT; 202 203 page = pages[pgoff]; 204 205 VERB("Inserting %p pfn %lx, pa %lx", (void *)vmf->address, 206 page_to_pfn(page), page_to_pfn(page) << PAGE_SHIFT); 207 208 return vmf_insert_page(vma, vmf->address, page); 209 } 210 211 int etnaviv_gem_mmap_offset(struct drm_gem_object *obj, u64 *offset) 212 { 213 int ret; 214 215 /* Make it mmapable */ 216 ret = drm_gem_create_mmap_offset(obj); 217 if (ret) 218 dev_err(obj->dev->dev, "could not allocate mmap offset\n"); 219 else 220 *offset = drm_vma_node_offset_addr(&obj->vma_node); 221 222 return ret; 223 } 224 225 static struct etnaviv_vram_mapping * 226 etnaviv_gem_get_vram_mapping(struct etnaviv_gem_object *obj, 227 struct etnaviv_iommu_context *context) 228 { 229 struct etnaviv_vram_mapping *mapping; 230 231 list_for_each_entry(mapping, &obj->vram_list, obj_node) { 232 if (mapping->context == context) 233 return mapping; 234 } 235 236 return NULL; 237 } 238 239 void etnaviv_gem_mapping_unreference(struct etnaviv_vram_mapping *mapping) 240 { 241 struct etnaviv_gem_object *etnaviv_obj = mapping->object; 242 243 mutex_lock(&etnaviv_obj->lock); 244 WARN_ON(mapping->use == 0); 245 mapping->use -= 1; 246 mutex_unlock(&etnaviv_obj->lock); 247 248 drm_gem_object_put(&etnaviv_obj->base); 249 } 250 251 struct etnaviv_vram_mapping *etnaviv_gem_mapping_get( 252 struct drm_gem_object *obj, struct etnaviv_iommu_context *mmu_context, 253 u64 va) 254 { 255 struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj); 256 struct etnaviv_vram_mapping *mapping; 257 struct page **pages; 258 int ret = 0; 259 260 mutex_lock(&etnaviv_obj->lock); 261 mapping = etnaviv_gem_get_vram_mapping(etnaviv_obj, mmu_context); 262 if (mapping) { 263 /* 264 * Holding the object lock prevents the use count changing 265 * beneath us. If the use count is zero, the MMU might be 266 * reaping this object, so take the lock and re-check that 267 * the MMU owns this mapping to close this race. 268 */ 269 if (mapping->use == 0) { 270 mutex_lock(&mmu_context->lock); 271 if (mapping->context == mmu_context) 272 mapping->use += 1; 273 else 274 mapping = NULL; 275 mutex_unlock(&mmu_context->lock); 276 if (mapping) 277 goto out; 278 } else { 279 mapping->use += 1; 280 goto out; 281 } 282 } 283 284 pages = etnaviv_gem_get_pages(etnaviv_obj); 285 if (IS_ERR(pages)) { 286 ret = PTR_ERR(pages); 287 goto out; 288 } 289 290 /* 291 * See if we have a reaped vram mapping we can re-use before 292 * allocating a fresh mapping. 293 */ 294 mapping = etnaviv_gem_get_vram_mapping(etnaviv_obj, NULL); 295 if (!mapping) { 296 mapping = kzalloc(sizeof(*mapping), GFP_KERNEL); 297 if (!mapping) { 298 ret = -ENOMEM; 299 goto out; 300 } 301 302 INIT_LIST_HEAD(&mapping->scan_node); 303 mapping->object = etnaviv_obj; 304 } else { 305 list_del(&mapping->obj_node); 306 } 307 308 etnaviv_iommu_context_get(mmu_context); 309 mapping->context = mmu_context; 310 mapping->use = 1; 311 312 ret = etnaviv_iommu_map_gem(mmu_context, etnaviv_obj, 313 mmu_context->global->memory_base, 314 mapping, va); 315 if (ret < 0) { 316 etnaviv_iommu_context_put(mmu_context); 317 kfree(mapping); 318 } else { 319 list_add_tail(&mapping->obj_node, &etnaviv_obj->vram_list); 320 } 321 322 out: 323 mutex_unlock(&etnaviv_obj->lock); 324 325 if (ret) 326 return ERR_PTR(ret); 327 328 /* Take a reference on the object */ 329 drm_gem_object_get(obj); 330 return mapping; 331 } 332 333 void *etnaviv_gem_vmap(struct drm_gem_object *obj) 334 { 335 struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj); 336 337 if (etnaviv_obj->vaddr) 338 return etnaviv_obj->vaddr; 339 340 mutex_lock(&etnaviv_obj->lock); 341 /* 342 * Need to check again, as we might have raced with another thread 343 * while waiting for the mutex. 344 */ 345 if (!etnaviv_obj->vaddr) 346 etnaviv_obj->vaddr = etnaviv_obj->ops->vmap(etnaviv_obj); 347 mutex_unlock(&etnaviv_obj->lock); 348 349 return etnaviv_obj->vaddr; 350 } 351 352 static void *etnaviv_gem_vmap_impl(struct etnaviv_gem_object *obj) 353 { 354 struct page **pages; 355 356 lockdep_assert_held(&obj->lock); 357 358 pages = etnaviv_gem_get_pages(obj); 359 if (IS_ERR(pages)) 360 return NULL; 361 362 return vmap(pages, obj->base.size >> PAGE_SHIFT, 363 VM_MAP, pgprot_writecombine(PAGE_KERNEL)); 364 } 365 366 static inline enum dma_data_direction etnaviv_op_to_dma_dir(u32 op) 367 { 368 if (op & ETNA_PREP_READ) 369 return DMA_FROM_DEVICE; 370 else if (op & ETNA_PREP_WRITE) 371 return DMA_TO_DEVICE; 372 else 373 return DMA_BIDIRECTIONAL; 374 } 375 376 int etnaviv_gem_cpu_prep(struct drm_gem_object *obj, u32 op, 377 struct drm_etnaviv_timespec *timeout) 378 { 379 struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj); 380 struct drm_device *dev = obj->dev; 381 bool write = !!(op & ETNA_PREP_WRITE); 382 int ret; 383 384 if (!etnaviv_obj->sgt) { 385 void *ret; 386 387 mutex_lock(&etnaviv_obj->lock); 388 ret = etnaviv_gem_get_pages(etnaviv_obj); 389 mutex_unlock(&etnaviv_obj->lock); 390 if (IS_ERR(ret)) 391 return PTR_ERR(ret); 392 } 393 394 if (op & ETNA_PREP_NOSYNC) { 395 if (!dma_resv_test_signaled_rcu(obj->resv, 396 write)) 397 return -EBUSY; 398 } else { 399 unsigned long remain = etnaviv_timeout_to_jiffies(timeout); 400 401 ret = dma_resv_wait_timeout_rcu(obj->resv, 402 write, true, remain); 403 if (ret <= 0) 404 return ret == 0 ? -ETIMEDOUT : ret; 405 } 406 407 if (etnaviv_obj->flags & ETNA_BO_CACHED) { 408 dma_sync_sgtable_for_cpu(dev->dev, etnaviv_obj->sgt, 409 etnaviv_op_to_dma_dir(op)); 410 etnaviv_obj->last_cpu_prep_op = op; 411 } 412 413 return 0; 414 } 415 416 int etnaviv_gem_cpu_fini(struct drm_gem_object *obj) 417 { 418 struct drm_device *dev = obj->dev; 419 struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj); 420 421 if (etnaviv_obj->flags & ETNA_BO_CACHED) { 422 /* fini without a prep is almost certainly a userspace error */ 423 WARN_ON(etnaviv_obj->last_cpu_prep_op == 0); 424 dma_sync_sgtable_for_device(dev->dev, etnaviv_obj->sgt, 425 etnaviv_op_to_dma_dir(etnaviv_obj->last_cpu_prep_op)); 426 etnaviv_obj->last_cpu_prep_op = 0; 427 } 428 429 return 0; 430 } 431 432 int etnaviv_gem_wait_bo(struct etnaviv_gpu *gpu, struct drm_gem_object *obj, 433 struct drm_etnaviv_timespec *timeout) 434 { 435 struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj); 436 437 return etnaviv_gpu_wait_obj_inactive(gpu, etnaviv_obj, timeout); 438 } 439 440 #ifdef CONFIG_DEBUG_FS 441 static void etnaviv_gem_describe_fence(struct dma_fence *fence, 442 const char *type, struct seq_file *m) 443 { 444 if (!test_bit(DMA_FENCE_FLAG_SIGNALED_BIT, &fence->flags)) 445 seq_printf(m, "\t%9s: %s %s seq %llu\n", 446 type, 447 fence->ops->get_driver_name(fence), 448 fence->ops->get_timeline_name(fence), 449 fence->seqno); 450 } 451 452 static void etnaviv_gem_describe(struct drm_gem_object *obj, struct seq_file *m) 453 { 454 struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj); 455 struct dma_resv *robj = obj->resv; 456 struct dma_resv_list *fobj; 457 struct dma_fence *fence; 458 unsigned long off = drm_vma_node_start(&obj->vma_node); 459 460 seq_printf(m, "%08x: %c %2d (%2d) %08lx %p %zd\n", 461 etnaviv_obj->flags, is_active(etnaviv_obj) ? 'A' : 'I', 462 obj->name, kref_read(&obj->refcount), 463 off, etnaviv_obj->vaddr, obj->size); 464 465 rcu_read_lock(); 466 fobj = rcu_dereference(robj->fence); 467 if (fobj) { 468 unsigned int i, shared_count = fobj->shared_count; 469 470 for (i = 0; i < shared_count; i++) { 471 fence = rcu_dereference(fobj->shared[i]); 472 etnaviv_gem_describe_fence(fence, "Shared", m); 473 } 474 } 475 476 fence = rcu_dereference(robj->fence_excl); 477 if (fence) 478 etnaviv_gem_describe_fence(fence, "Exclusive", m); 479 rcu_read_unlock(); 480 } 481 482 void etnaviv_gem_describe_objects(struct etnaviv_drm_private *priv, 483 struct seq_file *m) 484 { 485 struct etnaviv_gem_object *etnaviv_obj; 486 int count = 0; 487 size_t size = 0; 488 489 mutex_lock(&priv->gem_lock); 490 list_for_each_entry(etnaviv_obj, &priv->gem_list, gem_node) { 491 struct drm_gem_object *obj = &etnaviv_obj->base; 492 493 seq_puts(m, " "); 494 etnaviv_gem_describe(obj, m); 495 count++; 496 size += obj->size; 497 } 498 mutex_unlock(&priv->gem_lock); 499 500 seq_printf(m, "Total %d objects, %zu bytes\n", count, size); 501 } 502 #endif 503 504 static void etnaviv_gem_shmem_release(struct etnaviv_gem_object *etnaviv_obj) 505 { 506 vunmap(etnaviv_obj->vaddr); 507 put_pages(etnaviv_obj); 508 } 509 510 static const struct etnaviv_gem_ops etnaviv_gem_shmem_ops = { 511 .get_pages = etnaviv_gem_shmem_get_pages, 512 .release = etnaviv_gem_shmem_release, 513 .vmap = etnaviv_gem_vmap_impl, 514 .mmap = etnaviv_gem_mmap_obj, 515 }; 516 517 void etnaviv_gem_free_object(struct drm_gem_object *obj) 518 { 519 struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj); 520 struct etnaviv_drm_private *priv = obj->dev->dev_private; 521 struct etnaviv_vram_mapping *mapping, *tmp; 522 523 /* object should not be active */ 524 WARN_ON(is_active(etnaviv_obj)); 525 526 mutex_lock(&priv->gem_lock); 527 list_del(&etnaviv_obj->gem_node); 528 mutex_unlock(&priv->gem_lock); 529 530 list_for_each_entry_safe(mapping, tmp, &etnaviv_obj->vram_list, 531 obj_node) { 532 struct etnaviv_iommu_context *context = mapping->context; 533 534 WARN_ON(mapping->use); 535 536 if (context) { 537 etnaviv_iommu_unmap_gem(context, mapping); 538 etnaviv_iommu_context_put(context); 539 } 540 541 list_del(&mapping->obj_node); 542 kfree(mapping); 543 } 544 545 drm_gem_free_mmap_offset(obj); 546 etnaviv_obj->ops->release(etnaviv_obj); 547 drm_gem_object_release(obj); 548 549 kfree(etnaviv_obj); 550 } 551 552 void etnaviv_gem_obj_add(struct drm_device *dev, struct drm_gem_object *obj) 553 { 554 struct etnaviv_drm_private *priv = dev->dev_private; 555 struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj); 556 557 mutex_lock(&priv->gem_lock); 558 list_add_tail(&etnaviv_obj->gem_node, &priv->gem_list); 559 mutex_unlock(&priv->gem_lock); 560 } 561 562 static int etnaviv_gem_new_impl(struct drm_device *dev, u32 size, u32 flags, 563 const struct etnaviv_gem_ops *ops, struct drm_gem_object **obj) 564 { 565 struct etnaviv_gem_object *etnaviv_obj; 566 unsigned sz = sizeof(*etnaviv_obj); 567 bool valid = true; 568 569 /* validate flags */ 570 switch (flags & ETNA_BO_CACHE_MASK) { 571 case ETNA_BO_UNCACHED: 572 case ETNA_BO_CACHED: 573 case ETNA_BO_WC: 574 break; 575 default: 576 valid = false; 577 } 578 579 if (!valid) { 580 dev_err(dev->dev, "invalid cache flag: %x\n", 581 (flags & ETNA_BO_CACHE_MASK)); 582 return -EINVAL; 583 } 584 585 etnaviv_obj = kzalloc(sz, GFP_KERNEL); 586 if (!etnaviv_obj) 587 return -ENOMEM; 588 589 etnaviv_obj->flags = flags; 590 etnaviv_obj->ops = ops; 591 592 mutex_init(&etnaviv_obj->lock); 593 INIT_LIST_HEAD(&etnaviv_obj->vram_list); 594 595 *obj = &etnaviv_obj->base; 596 597 return 0; 598 } 599 600 /* convenience method to construct a GEM buffer object, and userspace handle */ 601 int etnaviv_gem_new_handle(struct drm_device *dev, struct drm_file *file, 602 u32 size, u32 flags, u32 *handle) 603 { 604 struct etnaviv_drm_private *priv = dev->dev_private; 605 struct drm_gem_object *obj = NULL; 606 int ret; 607 608 size = PAGE_ALIGN(size); 609 610 ret = etnaviv_gem_new_impl(dev, size, flags, 611 &etnaviv_gem_shmem_ops, &obj); 612 if (ret) 613 goto fail; 614 615 lockdep_set_class(&to_etnaviv_bo(obj)->lock, &etnaviv_shm_lock_class); 616 617 ret = drm_gem_object_init(dev, obj, size); 618 if (ret) 619 goto fail; 620 621 /* 622 * Our buffers are kept pinned, so allocating them from the MOVABLE 623 * zone is a really bad idea, and conflicts with CMA. See comments 624 * above new_inode() why this is required _and_ expected if you're 625 * going to pin these pages. 626 */ 627 mapping_set_gfp_mask(obj->filp->f_mapping, priv->shm_gfp_mask); 628 629 etnaviv_gem_obj_add(dev, obj); 630 631 ret = drm_gem_handle_create(file, obj, handle); 632 633 /* drop reference from allocate - handle holds it now */ 634 fail: 635 drm_gem_object_put(obj); 636 637 return ret; 638 } 639 640 int etnaviv_gem_new_private(struct drm_device *dev, size_t size, u32 flags, 641 const struct etnaviv_gem_ops *ops, struct etnaviv_gem_object **res) 642 { 643 struct drm_gem_object *obj; 644 int ret; 645 646 ret = etnaviv_gem_new_impl(dev, size, flags, ops, &obj); 647 if (ret) 648 return ret; 649 650 drm_gem_private_object_init(dev, obj, size); 651 652 *res = to_etnaviv_bo(obj); 653 654 return 0; 655 } 656 657 static int etnaviv_gem_userptr_get_pages(struct etnaviv_gem_object *etnaviv_obj) 658 { 659 struct page **pvec = NULL; 660 struct etnaviv_gem_userptr *userptr = &etnaviv_obj->userptr; 661 int ret, pinned = 0, npages = etnaviv_obj->base.size >> PAGE_SHIFT; 662 663 might_lock_read(¤t->mm->mmap_lock); 664 665 if (userptr->mm != current->mm) 666 return -EPERM; 667 668 pvec = kvmalloc_array(npages, sizeof(struct page *), GFP_KERNEL); 669 if (!pvec) 670 return -ENOMEM; 671 672 do { 673 unsigned num_pages = npages - pinned; 674 uint64_t ptr = userptr->ptr + pinned * PAGE_SIZE; 675 struct page **pages = pvec + pinned; 676 677 ret = pin_user_pages_fast(ptr, num_pages, 678 !userptr->ro ? FOLL_WRITE : 0, pages); 679 if (ret < 0) { 680 unpin_user_pages(pvec, pinned); 681 kvfree(pvec); 682 return ret; 683 } 684 685 pinned += ret; 686 687 } while (pinned < npages); 688 689 etnaviv_obj->pages = pvec; 690 691 return 0; 692 } 693 694 static void etnaviv_gem_userptr_release(struct etnaviv_gem_object *etnaviv_obj) 695 { 696 if (etnaviv_obj->sgt) { 697 etnaviv_gem_scatterlist_unmap(etnaviv_obj); 698 sg_free_table(etnaviv_obj->sgt); 699 kfree(etnaviv_obj->sgt); 700 } 701 if (etnaviv_obj->pages) { 702 int npages = etnaviv_obj->base.size >> PAGE_SHIFT; 703 704 unpin_user_pages(etnaviv_obj->pages, npages); 705 kvfree(etnaviv_obj->pages); 706 } 707 } 708 709 static int etnaviv_gem_userptr_mmap_obj(struct etnaviv_gem_object *etnaviv_obj, 710 struct vm_area_struct *vma) 711 { 712 return -EINVAL; 713 } 714 715 static const struct etnaviv_gem_ops etnaviv_gem_userptr_ops = { 716 .get_pages = etnaviv_gem_userptr_get_pages, 717 .release = etnaviv_gem_userptr_release, 718 .vmap = etnaviv_gem_vmap_impl, 719 .mmap = etnaviv_gem_userptr_mmap_obj, 720 }; 721 722 int etnaviv_gem_new_userptr(struct drm_device *dev, struct drm_file *file, 723 uintptr_t ptr, u32 size, u32 flags, u32 *handle) 724 { 725 struct etnaviv_gem_object *etnaviv_obj; 726 int ret; 727 728 ret = etnaviv_gem_new_private(dev, size, ETNA_BO_CACHED, 729 &etnaviv_gem_userptr_ops, &etnaviv_obj); 730 if (ret) 731 return ret; 732 733 lockdep_set_class(&etnaviv_obj->lock, &etnaviv_userptr_lock_class); 734 735 etnaviv_obj->userptr.ptr = ptr; 736 etnaviv_obj->userptr.mm = current->mm; 737 etnaviv_obj->userptr.ro = !(flags & ETNA_USERPTR_WRITE); 738 739 etnaviv_gem_obj_add(dev, &etnaviv_obj->base); 740 741 ret = drm_gem_handle_create(file, &etnaviv_obj->base, handle); 742 743 /* drop reference from allocate - handle holds it now */ 744 drm_gem_object_put(&etnaviv_obj->base); 745 return ret; 746 } 747