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_sg(dev->dev, sgt->sgl, sgt->nents, DMA_BIDIRECTIONAL); 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_sg(dev->dev, sgt->sgl, sgt->nents, DMA_BIDIRECTIONAL); 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->pages, npages); 107 if (IS_ERR(sgt)) { 108 dev_err(dev->dev, "failed to allocate sgt: %ld\n", 109 PTR_ERR(sgt)); 110 return ERR_CAST(sgt); 111 } 112 113 etnaviv_obj->sgt = sgt; 114 115 etnaviv_gem_scatter_map(etnaviv_obj); 116 } 117 118 return etnaviv_obj->pages; 119 } 120 121 void etnaviv_gem_put_pages(struct etnaviv_gem_object *etnaviv_obj) 122 { 123 lockdep_assert_held(&etnaviv_obj->lock); 124 /* when we start tracking the pin count, then do something here */ 125 } 126 127 static int etnaviv_gem_mmap_obj(struct etnaviv_gem_object *etnaviv_obj, 128 struct vm_area_struct *vma) 129 { 130 pgprot_t vm_page_prot; 131 132 vma->vm_flags &= ~VM_PFNMAP; 133 vma->vm_flags |= VM_MIXEDMAP; 134 135 vm_page_prot = vm_get_page_prot(vma->vm_flags); 136 137 if (etnaviv_obj->flags & ETNA_BO_WC) { 138 vma->vm_page_prot = pgprot_writecombine(vm_page_prot); 139 } else if (etnaviv_obj->flags & ETNA_BO_UNCACHED) { 140 vma->vm_page_prot = pgprot_noncached(vm_page_prot); 141 } else { 142 /* 143 * Shunt off cached objs to shmem file so they have their own 144 * address_space (so unmap_mapping_range does what we want, 145 * in particular in the case of mmap'd dmabufs) 146 */ 147 fput(vma->vm_file); 148 get_file(etnaviv_obj->base.filp); 149 vma->vm_pgoff = 0; 150 vma->vm_file = etnaviv_obj->base.filp; 151 152 vma->vm_page_prot = vm_page_prot; 153 } 154 155 return 0; 156 } 157 158 int etnaviv_gem_mmap(struct file *filp, struct vm_area_struct *vma) 159 { 160 struct etnaviv_gem_object *obj; 161 int ret; 162 163 ret = drm_gem_mmap(filp, vma); 164 if (ret) { 165 DBG("mmap failed: %d", ret); 166 return ret; 167 } 168 169 obj = to_etnaviv_bo(vma->vm_private_data); 170 return obj->ops->mmap(obj, vma); 171 } 172 173 vm_fault_t etnaviv_gem_fault(struct vm_fault *vmf) 174 { 175 struct vm_area_struct *vma = vmf->vma; 176 struct drm_gem_object *obj = vma->vm_private_data; 177 struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj); 178 struct page **pages, *page; 179 pgoff_t pgoff; 180 int err; 181 182 /* 183 * Make sure we don't parallel update on a fault, nor move or remove 184 * something from beneath our feet. Note that vmf_insert_page() is 185 * specifically coded to take care of this, so we don't have to. 186 */ 187 err = mutex_lock_interruptible(&etnaviv_obj->lock); 188 if (err) 189 return VM_FAULT_NOPAGE; 190 /* make sure we have pages attached now */ 191 pages = etnaviv_gem_get_pages(etnaviv_obj); 192 mutex_unlock(&etnaviv_obj->lock); 193 194 if (IS_ERR(pages)) { 195 err = PTR_ERR(pages); 196 return vmf_error(err); 197 } 198 199 /* We don't use vmf->pgoff since that has the fake offset: */ 200 pgoff = (vmf->address - vma->vm_start) >> PAGE_SHIFT; 201 202 page = pages[pgoff]; 203 204 VERB("Inserting %p pfn %lx, pa %lx", (void *)vmf->address, 205 page_to_pfn(page), page_to_pfn(page) << PAGE_SHIFT); 206 207 return vmf_insert_page(vma, vmf->address, page); 208 } 209 210 int etnaviv_gem_mmap_offset(struct drm_gem_object *obj, u64 *offset) 211 { 212 int ret; 213 214 /* Make it mmapable */ 215 ret = drm_gem_create_mmap_offset(obj); 216 if (ret) 217 dev_err(obj->dev->dev, "could not allocate mmap offset\n"); 218 else 219 *offset = drm_vma_node_offset_addr(&obj->vma_node); 220 221 return ret; 222 } 223 224 static struct etnaviv_vram_mapping * 225 etnaviv_gem_get_vram_mapping(struct etnaviv_gem_object *obj, 226 struct etnaviv_iommu_context *context) 227 { 228 struct etnaviv_vram_mapping *mapping; 229 230 list_for_each_entry(mapping, &obj->vram_list, obj_node) { 231 if (mapping->context == context) 232 return mapping; 233 } 234 235 return NULL; 236 } 237 238 void etnaviv_gem_mapping_unreference(struct etnaviv_vram_mapping *mapping) 239 { 240 struct etnaviv_gem_object *etnaviv_obj = mapping->object; 241 242 mutex_lock(&etnaviv_obj->lock); 243 WARN_ON(mapping->use == 0); 244 mapping->use -= 1; 245 mutex_unlock(&etnaviv_obj->lock); 246 247 drm_gem_object_put_unlocked(&etnaviv_obj->base); 248 } 249 250 struct etnaviv_vram_mapping *etnaviv_gem_mapping_get( 251 struct drm_gem_object *obj, struct etnaviv_iommu_context *mmu_context, 252 u64 va) 253 { 254 struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj); 255 struct etnaviv_vram_mapping *mapping; 256 struct page **pages; 257 int ret = 0; 258 259 mutex_lock(&etnaviv_obj->lock); 260 mapping = etnaviv_gem_get_vram_mapping(etnaviv_obj, mmu_context); 261 if (mapping) { 262 /* 263 * Holding the object lock prevents the use count changing 264 * beneath us. If the use count is zero, the MMU might be 265 * reaping this object, so take the lock and re-check that 266 * the MMU owns this mapping to close this race. 267 */ 268 if (mapping->use == 0) { 269 mutex_lock(&mmu_context->lock); 270 if (mapping->context == mmu_context) 271 mapping->use += 1; 272 else 273 mapping = NULL; 274 mutex_unlock(&mmu_context->lock); 275 if (mapping) 276 goto out; 277 } else { 278 mapping->use += 1; 279 goto out; 280 } 281 } 282 283 pages = etnaviv_gem_get_pages(etnaviv_obj); 284 if (IS_ERR(pages)) { 285 ret = PTR_ERR(pages); 286 goto out; 287 } 288 289 /* 290 * See if we have a reaped vram mapping we can re-use before 291 * allocating a fresh mapping. 292 */ 293 mapping = etnaviv_gem_get_vram_mapping(etnaviv_obj, NULL); 294 if (!mapping) { 295 mapping = kzalloc(sizeof(*mapping), GFP_KERNEL); 296 if (!mapping) { 297 ret = -ENOMEM; 298 goto out; 299 } 300 301 INIT_LIST_HEAD(&mapping->scan_node); 302 mapping->object = etnaviv_obj; 303 } else { 304 list_del(&mapping->obj_node); 305 } 306 307 etnaviv_iommu_context_get(mmu_context); 308 mapping->context = mmu_context; 309 mapping->use = 1; 310 311 ret = etnaviv_iommu_map_gem(mmu_context, etnaviv_obj, 312 mmu_context->global->memory_base, 313 mapping, va); 314 if (ret < 0) { 315 etnaviv_iommu_context_put(mmu_context); 316 kfree(mapping); 317 } else { 318 list_add_tail(&mapping->obj_node, &etnaviv_obj->vram_list); 319 } 320 321 out: 322 mutex_unlock(&etnaviv_obj->lock); 323 324 if (ret) 325 return ERR_PTR(ret); 326 327 /* Take a reference on the object */ 328 drm_gem_object_get(obj); 329 return mapping; 330 } 331 332 void *etnaviv_gem_vmap(struct drm_gem_object *obj) 333 { 334 struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj); 335 336 if (etnaviv_obj->vaddr) 337 return etnaviv_obj->vaddr; 338 339 mutex_lock(&etnaviv_obj->lock); 340 /* 341 * Need to check again, as we might have raced with another thread 342 * while waiting for the mutex. 343 */ 344 if (!etnaviv_obj->vaddr) 345 etnaviv_obj->vaddr = etnaviv_obj->ops->vmap(etnaviv_obj); 346 mutex_unlock(&etnaviv_obj->lock); 347 348 return etnaviv_obj->vaddr; 349 } 350 351 static void *etnaviv_gem_vmap_impl(struct etnaviv_gem_object *obj) 352 { 353 struct page **pages; 354 355 lockdep_assert_held(&obj->lock); 356 357 pages = etnaviv_gem_get_pages(obj); 358 if (IS_ERR(pages)) 359 return NULL; 360 361 return vmap(pages, obj->base.size >> PAGE_SHIFT, 362 VM_MAP, pgprot_writecombine(PAGE_KERNEL)); 363 } 364 365 static inline enum dma_data_direction etnaviv_op_to_dma_dir(u32 op) 366 { 367 if (op & ETNA_PREP_READ) 368 return DMA_FROM_DEVICE; 369 else if (op & ETNA_PREP_WRITE) 370 return DMA_TO_DEVICE; 371 else 372 return DMA_BIDIRECTIONAL; 373 } 374 375 int etnaviv_gem_cpu_prep(struct drm_gem_object *obj, u32 op, 376 struct drm_etnaviv_timespec *timeout) 377 { 378 struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj); 379 struct drm_device *dev = obj->dev; 380 bool write = !!(op & ETNA_PREP_WRITE); 381 int ret; 382 383 if (!etnaviv_obj->sgt) { 384 void *ret; 385 386 mutex_lock(&etnaviv_obj->lock); 387 ret = etnaviv_gem_get_pages(etnaviv_obj); 388 mutex_unlock(&etnaviv_obj->lock); 389 if (IS_ERR(ret)) 390 return PTR_ERR(ret); 391 } 392 393 if (op & ETNA_PREP_NOSYNC) { 394 if (!dma_resv_test_signaled_rcu(obj->resv, 395 write)) 396 return -EBUSY; 397 } else { 398 unsigned long remain = etnaviv_timeout_to_jiffies(timeout); 399 400 ret = dma_resv_wait_timeout_rcu(obj->resv, 401 write, true, remain); 402 if (ret <= 0) 403 return ret == 0 ? -ETIMEDOUT : ret; 404 } 405 406 if (etnaviv_obj->flags & ETNA_BO_CACHED) { 407 dma_sync_sg_for_cpu(dev->dev, etnaviv_obj->sgt->sgl, 408 etnaviv_obj->sgt->nents, 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_sg_for_device(dev->dev, etnaviv_obj->sgt->sgl, 425 etnaviv_obj->sgt->nents, 426 etnaviv_op_to_dma_dir(etnaviv_obj->last_cpu_prep_op)); 427 etnaviv_obj->last_cpu_prep_op = 0; 428 } 429 430 return 0; 431 } 432 433 int etnaviv_gem_wait_bo(struct etnaviv_gpu *gpu, struct drm_gem_object *obj, 434 struct drm_etnaviv_timespec *timeout) 435 { 436 struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj); 437 438 return etnaviv_gpu_wait_obj_inactive(gpu, etnaviv_obj, timeout); 439 } 440 441 #ifdef CONFIG_DEBUG_FS 442 static void etnaviv_gem_describe_fence(struct dma_fence *fence, 443 const char *type, struct seq_file *m) 444 { 445 if (!test_bit(DMA_FENCE_FLAG_SIGNALED_BIT, &fence->flags)) 446 seq_printf(m, "\t%9s: %s %s seq %llu\n", 447 type, 448 fence->ops->get_driver_name(fence), 449 fence->ops->get_timeline_name(fence), 450 fence->seqno); 451 } 452 453 static void etnaviv_gem_describe(struct drm_gem_object *obj, struct seq_file *m) 454 { 455 struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj); 456 struct dma_resv *robj = obj->resv; 457 struct dma_resv_list *fobj; 458 struct dma_fence *fence; 459 unsigned long off = drm_vma_node_start(&obj->vma_node); 460 461 seq_printf(m, "%08x: %c %2d (%2d) %08lx %p %zd\n", 462 etnaviv_obj->flags, is_active(etnaviv_obj) ? 'A' : 'I', 463 obj->name, kref_read(&obj->refcount), 464 off, etnaviv_obj->vaddr, obj->size); 465 466 rcu_read_lock(); 467 fobj = rcu_dereference(robj->fence); 468 if (fobj) { 469 unsigned int i, shared_count = fobj->shared_count; 470 471 for (i = 0; i < shared_count; i++) { 472 fence = rcu_dereference(fobj->shared[i]); 473 etnaviv_gem_describe_fence(fence, "Shared", m); 474 } 475 } 476 477 fence = rcu_dereference(robj->fence_excl); 478 if (fence) 479 etnaviv_gem_describe_fence(fence, "Exclusive", m); 480 rcu_read_unlock(); 481 } 482 483 void etnaviv_gem_describe_objects(struct etnaviv_drm_private *priv, 484 struct seq_file *m) 485 { 486 struct etnaviv_gem_object *etnaviv_obj; 487 int count = 0; 488 size_t size = 0; 489 490 mutex_lock(&priv->gem_lock); 491 list_for_each_entry(etnaviv_obj, &priv->gem_list, gem_node) { 492 struct drm_gem_object *obj = &etnaviv_obj->base; 493 494 seq_puts(m, " "); 495 etnaviv_gem_describe(obj, m); 496 count++; 497 size += obj->size; 498 } 499 mutex_unlock(&priv->gem_lock); 500 501 seq_printf(m, "Total %d objects, %zu bytes\n", count, size); 502 } 503 #endif 504 505 static void etnaviv_gem_shmem_release(struct etnaviv_gem_object *etnaviv_obj) 506 { 507 vunmap(etnaviv_obj->vaddr); 508 put_pages(etnaviv_obj); 509 } 510 511 static const struct etnaviv_gem_ops etnaviv_gem_shmem_ops = { 512 .get_pages = etnaviv_gem_shmem_get_pages, 513 .release = etnaviv_gem_shmem_release, 514 .vmap = etnaviv_gem_vmap_impl, 515 .mmap = etnaviv_gem_mmap_obj, 516 }; 517 518 void etnaviv_gem_free_object(struct drm_gem_object *obj) 519 { 520 struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj); 521 struct etnaviv_drm_private *priv = obj->dev->dev_private; 522 struct etnaviv_vram_mapping *mapping, *tmp; 523 524 /* object should not be active */ 525 WARN_ON(is_active(etnaviv_obj)); 526 527 mutex_lock(&priv->gem_lock); 528 list_del(&etnaviv_obj->gem_node); 529 mutex_unlock(&priv->gem_lock); 530 531 list_for_each_entry_safe(mapping, tmp, &etnaviv_obj->vram_list, 532 obj_node) { 533 struct etnaviv_iommu_context *context = mapping->context; 534 535 WARN_ON(mapping->use); 536 537 if (context) { 538 etnaviv_iommu_unmap_gem(context, mapping); 539 etnaviv_iommu_context_put(context); 540 } 541 542 list_del(&mapping->obj_node); 543 kfree(mapping); 544 } 545 546 drm_gem_free_mmap_offset(obj); 547 etnaviv_obj->ops->release(etnaviv_obj); 548 drm_gem_object_release(obj); 549 550 kfree(etnaviv_obj); 551 } 552 553 void etnaviv_gem_obj_add(struct drm_device *dev, struct drm_gem_object *obj) 554 { 555 struct etnaviv_drm_private *priv = dev->dev_private; 556 struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj); 557 558 mutex_lock(&priv->gem_lock); 559 list_add_tail(&etnaviv_obj->gem_node, &priv->gem_list); 560 mutex_unlock(&priv->gem_lock); 561 } 562 563 static int etnaviv_gem_new_impl(struct drm_device *dev, u32 size, u32 flags, 564 const struct etnaviv_gem_ops *ops, struct drm_gem_object **obj) 565 { 566 struct etnaviv_gem_object *etnaviv_obj; 567 unsigned sz = sizeof(*etnaviv_obj); 568 bool valid = true; 569 570 /* validate flags */ 571 switch (flags & ETNA_BO_CACHE_MASK) { 572 case ETNA_BO_UNCACHED: 573 case ETNA_BO_CACHED: 574 case ETNA_BO_WC: 575 break; 576 default: 577 valid = false; 578 } 579 580 if (!valid) { 581 dev_err(dev->dev, "invalid cache flag: %x\n", 582 (flags & ETNA_BO_CACHE_MASK)); 583 return -EINVAL; 584 } 585 586 etnaviv_obj = kzalloc(sz, GFP_KERNEL); 587 if (!etnaviv_obj) 588 return -ENOMEM; 589 590 etnaviv_obj->flags = flags; 591 etnaviv_obj->ops = ops; 592 593 mutex_init(&etnaviv_obj->lock); 594 INIT_LIST_HEAD(&etnaviv_obj->vram_list); 595 596 *obj = &etnaviv_obj->base; 597 598 return 0; 599 } 600 601 /* convenience method to construct a GEM buffer object, and userspace handle */ 602 int etnaviv_gem_new_handle(struct drm_device *dev, struct drm_file *file, 603 u32 size, u32 flags, u32 *handle) 604 { 605 struct etnaviv_drm_private *priv = dev->dev_private; 606 struct drm_gem_object *obj = NULL; 607 int ret; 608 609 size = PAGE_ALIGN(size); 610 611 ret = etnaviv_gem_new_impl(dev, size, flags, 612 &etnaviv_gem_shmem_ops, &obj); 613 if (ret) 614 goto fail; 615 616 lockdep_set_class(&to_etnaviv_bo(obj)->lock, &etnaviv_shm_lock_class); 617 618 ret = drm_gem_object_init(dev, obj, size); 619 if (ret) 620 goto fail; 621 622 /* 623 * Our buffers are kept pinned, so allocating them from the MOVABLE 624 * zone is a really bad idea, and conflicts with CMA. See comments 625 * above new_inode() why this is required _and_ expected if you're 626 * going to pin these pages. 627 */ 628 mapping_set_gfp_mask(obj->filp->f_mapping, priv->shm_gfp_mask); 629 630 etnaviv_gem_obj_add(dev, obj); 631 632 ret = drm_gem_handle_create(file, obj, handle); 633 634 /* drop reference from allocate - handle holds it now */ 635 fail: 636 drm_gem_object_put_unlocked(obj); 637 638 return ret; 639 } 640 641 int etnaviv_gem_new_private(struct drm_device *dev, size_t size, u32 flags, 642 const struct etnaviv_gem_ops *ops, struct etnaviv_gem_object **res) 643 { 644 struct drm_gem_object *obj; 645 int ret; 646 647 ret = etnaviv_gem_new_impl(dev, size, flags, ops, &obj); 648 if (ret) 649 return ret; 650 651 drm_gem_private_object_init(dev, obj, size); 652 653 *res = to_etnaviv_bo(obj); 654 655 return 0; 656 } 657 658 static int etnaviv_gem_userptr_get_pages(struct etnaviv_gem_object *etnaviv_obj) 659 { 660 struct page **pvec = NULL; 661 struct etnaviv_gem_userptr *userptr = &etnaviv_obj->userptr; 662 int ret, pinned = 0, npages = etnaviv_obj->base.size >> PAGE_SHIFT; 663 664 might_lock_read(¤t->mm->mmap_sem); 665 666 if (userptr->mm != current->mm) 667 return -EPERM; 668 669 pvec = kvmalloc_array(npages, sizeof(struct page *), GFP_KERNEL); 670 if (!pvec) 671 return -ENOMEM; 672 673 do { 674 unsigned num_pages = npages - pinned; 675 uint64_t ptr = userptr->ptr + pinned * PAGE_SIZE; 676 struct page **pages = pvec + pinned; 677 678 ret = get_user_pages_fast(ptr, num_pages, 679 !userptr->ro ? FOLL_WRITE : 0, pages); 680 if (ret < 0) { 681 release_pages(pvec, pinned); 682 kvfree(pvec); 683 return ret; 684 } 685 686 pinned += ret; 687 688 } while (pinned < npages); 689 690 etnaviv_obj->pages = pvec; 691 692 return 0; 693 } 694 695 static void etnaviv_gem_userptr_release(struct etnaviv_gem_object *etnaviv_obj) 696 { 697 if (etnaviv_obj->sgt) { 698 etnaviv_gem_scatterlist_unmap(etnaviv_obj); 699 sg_free_table(etnaviv_obj->sgt); 700 kfree(etnaviv_obj->sgt); 701 } 702 if (etnaviv_obj->pages) { 703 int npages = etnaviv_obj->base.size >> PAGE_SHIFT; 704 705 release_pages(etnaviv_obj->pages, npages); 706 kvfree(etnaviv_obj->pages); 707 } 708 } 709 710 static int etnaviv_gem_userptr_mmap_obj(struct etnaviv_gem_object *etnaviv_obj, 711 struct vm_area_struct *vma) 712 { 713 return -EINVAL; 714 } 715 716 static const struct etnaviv_gem_ops etnaviv_gem_userptr_ops = { 717 .get_pages = etnaviv_gem_userptr_get_pages, 718 .release = etnaviv_gem_userptr_release, 719 .vmap = etnaviv_gem_vmap_impl, 720 .mmap = etnaviv_gem_userptr_mmap_obj, 721 }; 722 723 int etnaviv_gem_new_userptr(struct drm_device *dev, struct drm_file *file, 724 uintptr_t ptr, u32 size, u32 flags, u32 *handle) 725 { 726 struct etnaviv_gem_object *etnaviv_obj; 727 int ret; 728 729 ret = etnaviv_gem_new_private(dev, size, ETNA_BO_CACHED, 730 &etnaviv_gem_userptr_ops, &etnaviv_obj); 731 if (ret) 732 return ret; 733 734 lockdep_set_class(&etnaviv_obj->lock, &etnaviv_userptr_lock_class); 735 736 etnaviv_obj->userptr.ptr = ptr; 737 etnaviv_obj->userptr.mm = current->mm; 738 etnaviv_obj->userptr.ro = !(flags & ETNA_USERPTR_WRITE); 739 740 etnaviv_gem_obj_add(dev, &etnaviv_obj->base); 741 742 ret = drm_gem_handle_create(file, &etnaviv_obj->base, handle); 743 744 /* drop reference from allocate - handle holds it now */ 745 drm_gem_object_put_unlocked(&etnaviv_obj->base); 746 return ret; 747 } 748