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 vma->vm_pgoff = 0; 149 vma_set_file(vma, etnaviv_obj->base.filp); 150 151 vma->vm_page_prot = vm_page_prot; 152 } 153 154 return 0; 155 } 156 157 int etnaviv_gem_mmap(struct file *filp, struct vm_area_struct *vma) 158 { 159 struct etnaviv_gem_object *obj; 160 int ret; 161 162 ret = drm_gem_mmap(filp, vma); 163 if (ret) { 164 DBG("mmap failed: %d", ret); 165 return ret; 166 } 167 168 obj = to_etnaviv_bo(vma->vm_private_data); 169 return obj->ops->mmap(obj, vma); 170 } 171 172 static vm_fault_t etnaviv_gem_fault(struct vm_fault *vmf) 173 { 174 struct vm_area_struct *vma = vmf->vma; 175 struct drm_gem_object *obj = vma->vm_private_data; 176 struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj); 177 struct page **pages, *page; 178 pgoff_t pgoff; 179 int err; 180 181 /* 182 * Make sure we don't parallel update on a fault, nor move or remove 183 * something from beneath our feet. Note that vmf_insert_page() is 184 * specifically coded to take care of this, so we don't have to. 185 */ 186 err = mutex_lock_interruptible(&etnaviv_obj->lock); 187 if (err) 188 return VM_FAULT_NOPAGE; 189 /* make sure we have pages attached now */ 190 pages = etnaviv_gem_get_pages(etnaviv_obj); 191 mutex_unlock(&etnaviv_obj->lock); 192 193 if (IS_ERR(pages)) { 194 err = PTR_ERR(pages); 195 return vmf_error(err); 196 } 197 198 /* We don't use vmf->pgoff since that has the fake offset: */ 199 pgoff = (vmf->address - vma->vm_start) >> PAGE_SHIFT; 200 201 page = pages[pgoff]; 202 203 VERB("Inserting %p pfn %lx, pa %lx", (void *)vmf->address, 204 page_to_pfn(page), page_to_pfn(page) << PAGE_SHIFT); 205 206 return vmf_insert_page(vma, vmf->address, page); 207 } 208 209 int etnaviv_gem_mmap_offset(struct drm_gem_object *obj, u64 *offset) 210 { 211 int ret; 212 213 /* Make it mmapable */ 214 ret = drm_gem_create_mmap_offset(obj); 215 if (ret) 216 dev_err(obj->dev->dev, "could not allocate mmap offset\n"); 217 else 218 *offset = drm_vma_node_offset_addr(&obj->vma_node); 219 220 return ret; 221 } 222 223 static struct etnaviv_vram_mapping * 224 etnaviv_gem_get_vram_mapping(struct etnaviv_gem_object *obj, 225 struct etnaviv_iommu_context *context) 226 { 227 struct etnaviv_vram_mapping *mapping; 228 229 list_for_each_entry(mapping, &obj->vram_list, obj_node) { 230 if (mapping->context == context) 231 return mapping; 232 } 233 234 return NULL; 235 } 236 237 void etnaviv_gem_mapping_unreference(struct etnaviv_vram_mapping *mapping) 238 { 239 struct etnaviv_gem_object *etnaviv_obj = mapping->object; 240 241 mutex_lock(&etnaviv_obj->lock); 242 WARN_ON(mapping->use == 0); 243 mapping->use -= 1; 244 mutex_unlock(&etnaviv_obj->lock); 245 246 drm_gem_object_put(&etnaviv_obj->base); 247 } 248 249 struct etnaviv_vram_mapping *etnaviv_gem_mapping_get( 250 struct drm_gem_object *obj, struct etnaviv_iommu_context *mmu_context, 251 u64 va) 252 { 253 struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj); 254 struct etnaviv_vram_mapping *mapping; 255 struct page **pages; 256 int ret = 0; 257 258 mutex_lock(&etnaviv_obj->lock); 259 mapping = etnaviv_gem_get_vram_mapping(etnaviv_obj, mmu_context); 260 if (mapping) { 261 /* 262 * Holding the object lock prevents the use count changing 263 * beneath us. If the use count is zero, the MMU might be 264 * reaping this object, so take the lock and re-check that 265 * the MMU owns this mapping to close this race. 266 */ 267 if (mapping->use == 0) { 268 mutex_lock(&mmu_context->lock); 269 if (mapping->context == mmu_context) 270 mapping->use += 1; 271 else 272 mapping = NULL; 273 mutex_unlock(&mmu_context->lock); 274 if (mapping) 275 goto out; 276 } else { 277 mapping->use += 1; 278 goto out; 279 } 280 } 281 282 pages = etnaviv_gem_get_pages(etnaviv_obj); 283 if (IS_ERR(pages)) { 284 ret = PTR_ERR(pages); 285 goto out; 286 } 287 288 /* 289 * See if we have a reaped vram mapping we can re-use before 290 * allocating a fresh mapping. 291 */ 292 mapping = etnaviv_gem_get_vram_mapping(etnaviv_obj, NULL); 293 if (!mapping) { 294 mapping = kzalloc(sizeof(*mapping), GFP_KERNEL); 295 if (!mapping) { 296 ret = -ENOMEM; 297 goto out; 298 } 299 300 INIT_LIST_HEAD(&mapping->scan_node); 301 mapping->object = etnaviv_obj; 302 } else { 303 list_del(&mapping->obj_node); 304 } 305 306 etnaviv_iommu_context_get(mmu_context); 307 mapping->context = mmu_context; 308 mapping->use = 1; 309 310 ret = etnaviv_iommu_map_gem(mmu_context, etnaviv_obj, 311 mmu_context->global->memory_base, 312 mapping, va); 313 if (ret < 0) { 314 etnaviv_iommu_context_put(mmu_context); 315 kfree(mapping); 316 } else { 317 list_add_tail(&mapping->obj_node, &etnaviv_obj->vram_list); 318 } 319 320 out: 321 mutex_unlock(&etnaviv_obj->lock); 322 323 if (ret) 324 return ERR_PTR(ret); 325 326 /* Take a reference on the object */ 327 drm_gem_object_get(obj); 328 return mapping; 329 } 330 331 void *etnaviv_gem_vmap(struct drm_gem_object *obj) 332 { 333 struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj); 334 335 if (etnaviv_obj->vaddr) 336 return etnaviv_obj->vaddr; 337 338 mutex_lock(&etnaviv_obj->lock); 339 /* 340 * Need to check again, as we might have raced with another thread 341 * while waiting for the mutex. 342 */ 343 if (!etnaviv_obj->vaddr) 344 etnaviv_obj->vaddr = etnaviv_obj->ops->vmap(etnaviv_obj); 345 mutex_unlock(&etnaviv_obj->lock); 346 347 return etnaviv_obj->vaddr; 348 } 349 350 static void *etnaviv_gem_vmap_impl(struct etnaviv_gem_object *obj) 351 { 352 struct page **pages; 353 354 lockdep_assert_held(&obj->lock); 355 356 pages = etnaviv_gem_get_pages(obj); 357 if (IS_ERR(pages)) 358 return NULL; 359 360 return vmap(pages, obj->base.size >> PAGE_SHIFT, 361 VM_MAP, pgprot_writecombine(PAGE_KERNEL)); 362 } 363 364 static inline enum dma_data_direction etnaviv_op_to_dma_dir(u32 op) 365 { 366 if (op & ETNA_PREP_READ) 367 return DMA_FROM_DEVICE; 368 else if (op & ETNA_PREP_WRITE) 369 return DMA_TO_DEVICE; 370 else 371 return DMA_BIDIRECTIONAL; 372 } 373 374 int etnaviv_gem_cpu_prep(struct drm_gem_object *obj, u32 op, 375 struct drm_etnaviv_timespec *timeout) 376 { 377 struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj); 378 struct drm_device *dev = obj->dev; 379 bool write = !!(op & ETNA_PREP_WRITE); 380 int ret; 381 382 if (!etnaviv_obj->sgt) { 383 void *ret; 384 385 mutex_lock(&etnaviv_obj->lock); 386 ret = etnaviv_gem_get_pages(etnaviv_obj); 387 mutex_unlock(&etnaviv_obj->lock); 388 if (IS_ERR(ret)) 389 return PTR_ERR(ret); 390 } 391 392 if (op & ETNA_PREP_NOSYNC) { 393 if (!dma_resv_test_signaled_rcu(obj->resv, 394 write)) 395 return -EBUSY; 396 } else { 397 unsigned long remain = etnaviv_timeout_to_jiffies(timeout); 398 399 ret = dma_resv_wait_timeout_rcu(obj->resv, 400 write, true, remain); 401 if (ret <= 0) 402 return ret == 0 ? -ETIMEDOUT : ret; 403 } 404 405 if (etnaviv_obj->flags & ETNA_BO_CACHED) { 406 dma_sync_sgtable_for_cpu(dev->dev, etnaviv_obj->sgt, 407 etnaviv_op_to_dma_dir(op)); 408 etnaviv_obj->last_cpu_prep_op = op; 409 } 410 411 return 0; 412 } 413 414 int etnaviv_gem_cpu_fini(struct drm_gem_object *obj) 415 { 416 struct drm_device *dev = obj->dev; 417 struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj); 418 419 if (etnaviv_obj->flags & ETNA_BO_CACHED) { 420 /* fini without a prep is almost certainly a userspace error */ 421 WARN_ON(etnaviv_obj->last_cpu_prep_op == 0); 422 dma_sync_sgtable_for_device(dev->dev, etnaviv_obj->sgt, 423 etnaviv_op_to_dma_dir(etnaviv_obj->last_cpu_prep_op)); 424 etnaviv_obj->last_cpu_prep_op = 0; 425 } 426 427 return 0; 428 } 429 430 int etnaviv_gem_wait_bo(struct etnaviv_gpu *gpu, struct drm_gem_object *obj, 431 struct drm_etnaviv_timespec *timeout) 432 { 433 struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj); 434 435 return etnaviv_gpu_wait_obj_inactive(gpu, etnaviv_obj, timeout); 436 } 437 438 #ifdef CONFIG_DEBUG_FS 439 static void etnaviv_gem_describe_fence(struct dma_fence *fence, 440 const char *type, struct seq_file *m) 441 { 442 if (!test_bit(DMA_FENCE_FLAG_SIGNALED_BIT, &fence->flags)) 443 seq_printf(m, "\t%9s: %s %s seq %llu\n", 444 type, 445 fence->ops->get_driver_name(fence), 446 fence->ops->get_timeline_name(fence), 447 fence->seqno); 448 } 449 450 static void etnaviv_gem_describe(struct drm_gem_object *obj, struct seq_file *m) 451 { 452 struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj); 453 struct dma_resv *robj = obj->resv; 454 struct dma_resv_list *fobj; 455 struct dma_fence *fence; 456 unsigned long off = drm_vma_node_start(&obj->vma_node); 457 458 seq_printf(m, "%08x: %c %2d (%2d) %08lx %p %zd\n", 459 etnaviv_obj->flags, is_active(etnaviv_obj) ? 'A' : 'I', 460 obj->name, kref_read(&obj->refcount), 461 off, etnaviv_obj->vaddr, obj->size); 462 463 rcu_read_lock(); 464 fobj = rcu_dereference(robj->fence); 465 if (fobj) { 466 unsigned int i, shared_count = fobj->shared_count; 467 468 for (i = 0; i < shared_count; i++) { 469 fence = rcu_dereference(fobj->shared[i]); 470 etnaviv_gem_describe_fence(fence, "Shared", m); 471 } 472 } 473 474 fence = rcu_dereference(robj->fence_excl); 475 if (fence) 476 etnaviv_gem_describe_fence(fence, "Exclusive", m); 477 rcu_read_unlock(); 478 } 479 480 void etnaviv_gem_describe_objects(struct etnaviv_drm_private *priv, 481 struct seq_file *m) 482 { 483 struct etnaviv_gem_object *etnaviv_obj; 484 int count = 0; 485 size_t size = 0; 486 487 mutex_lock(&priv->gem_lock); 488 list_for_each_entry(etnaviv_obj, &priv->gem_list, gem_node) { 489 struct drm_gem_object *obj = &etnaviv_obj->base; 490 491 seq_puts(m, " "); 492 etnaviv_gem_describe(obj, m); 493 count++; 494 size += obj->size; 495 } 496 mutex_unlock(&priv->gem_lock); 497 498 seq_printf(m, "Total %d objects, %zu bytes\n", count, size); 499 } 500 #endif 501 502 static void etnaviv_gem_shmem_release(struct etnaviv_gem_object *etnaviv_obj) 503 { 504 vunmap(etnaviv_obj->vaddr); 505 put_pages(etnaviv_obj); 506 } 507 508 static const struct etnaviv_gem_ops etnaviv_gem_shmem_ops = { 509 .get_pages = etnaviv_gem_shmem_get_pages, 510 .release = etnaviv_gem_shmem_release, 511 .vmap = etnaviv_gem_vmap_impl, 512 .mmap = etnaviv_gem_mmap_obj, 513 }; 514 515 void etnaviv_gem_free_object(struct drm_gem_object *obj) 516 { 517 struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj); 518 struct etnaviv_drm_private *priv = obj->dev->dev_private; 519 struct etnaviv_vram_mapping *mapping, *tmp; 520 521 /* object should not be active */ 522 WARN_ON(is_active(etnaviv_obj)); 523 524 mutex_lock(&priv->gem_lock); 525 list_del(&etnaviv_obj->gem_node); 526 mutex_unlock(&priv->gem_lock); 527 528 list_for_each_entry_safe(mapping, tmp, &etnaviv_obj->vram_list, 529 obj_node) { 530 struct etnaviv_iommu_context *context = mapping->context; 531 532 WARN_ON(mapping->use); 533 534 if (context) { 535 etnaviv_iommu_unmap_gem(context, mapping); 536 etnaviv_iommu_context_put(context); 537 } 538 539 list_del(&mapping->obj_node); 540 kfree(mapping); 541 } 542 543 drm_gem_free_mmap_offset(obj); 544 etnaviv_obj->ops->release(etnaviv_obj); 545 drm_gem_object_release(obj); 546 547 kfree(etnaviv_obj); 548 } 549 550 void etnaviv_gem_obj_add(struct drm_device *dev, struct drm_gem_object *obj) 551 { 552 struct etnaviv_drm_private *priv = dev->dev_private; 553 struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj); 554 555 mutex_lock(&priv->gem_lock); 556 list_add_tail(&etnaviv_obj->gem_node, &priv->gem_list); 557 mutex_unlock(&priv->gem_lock); 558 } 559 560 static const struct vm_operations_struct vm_ops = { 561 .fault = etnaviv_gem_fault, 562 .open = drm_gem_vm_open, 563 .close = drm_gem_vm_close, 564 }; 565 566 static const struct drm_gem_object_funcs etnaviv_gem_object_funcs = { 567 .free = etnaviv_gem_free_object, 568 .pin = etnaviv_gem_prime_pin, 569 .unpin = etnaviv_gem_prime_unpin, 570 .get_sg_table = etnaviv_gem_prime_get_sg_table, 571 .vmap = etnaviv_gem_prime_vmap, 572 .vm_ops = &vm_ops, 573 }; 574 575 static int etnaviv_gem_new_impl(struct drm_device *dev, u32 size, u32 flags, 576 const struct etnaviv_gem_ops *ops, struct drm_gem_object **obj) 577 { 578 struct etnaviv_gem_object *etnaviv_obj; 579 unsigned sz = sizeof(*etnaviv_obj); 580 bool valid = true; 581 582 /* validate flags */ 583 switch (flags & ETNA_BO_CACHE_MASK) { 584 case ETNA_BO_UNCACHED: 585 case ETNA_BO_CACHED: 586 case ETNA_BO_WC: 587 break; 588 default: 589 valid = false; 590 } 591 592 if (!valid) { 593 dev_err(dev->dev, "invalid cache flag: %x\n", 594 (flags & ETNA_BO_CACHE_MASK)); 595 return -EINVAL; 596 } 597 598 etnaviv_obj = kzalloc(sz, GFP_KERNEL); 599 if (!etnaviv_obj) 600 return -ENOMEM; 601 602 etnaviv_obj->flags = flags; 603 etnaviv_obj->ops = ops; 604 605 mutex_init(&etnaviv_obj->lock); 606 INIT_LIST_HEAD(&etnaviv_obj->vram_list); 607 608 *obj = &etnaviv_obj->base; 609 (*obj)->funcs = &etnaviv_gem_object_funcs; 610 611 return 0; 612 } 613 614 /* convenience method to construct a GEM buffer object, and userspace handle */ 615 int etnaviv_gem_new_handle(struct drm_device *dev, struct drm_file *file, 616 u32 size, u32 flags, u32 *handle) 617 { 618 struct etnaviv_drm_private *priv = dev->dev_private; 619 struct drm_gem_object *obj = NULL; 620 int ret; 621 622 size = PAGE_ALIGN(size); 623 624 ret = etnaviv_gem_new_impl(dev, size, flags, 625 &etnaviv_gem_shmem_ops, &obj); 626 if (ret) 627 goto fail; 628 629 lockdep_set_class(&to_etnaviv_bo(obj)->lock, &etnaviv_shm_lock_class); 630 631 ret = drm_gem_object_init(dev, obj, size); 632 if (ret) 633 goto fail; 634 635 /* 636 * Our buffers are kept pinned, so allocating them from the MOVABLE 637 * zone is a really bad idea, and conflicts with CMA. See comments 638 * above new_inode() why this is required _and_ expected if you're 639 * going to pin these pages. 640 */ 641 mapping_set_gfp_mask(obj->filp->f_mapping, priv->shm_gfp_mask); 642 643 etnaviv_gem_obj_add(dev, obj); 644 645 ret = drm_gem_handle_create(file, obj, handle); 646 647 /* drop reference from allocate - handle holds it now */ 648 fail: 649 drm_gem_object_put(obj); 650 651 return ret; 652 } 653 654 int etnaviv_gem_new_private(struct drm_device *dev, size_t size, u32 flags, 655 const struct etnaviv_gem_ops *ops, struct etnaviv_gem_object **res) 656 { 657 struct drm_gem_object *obj; 658 int ret; 659 660 ret = etnaviv_gem_new_impl(dev, size, flags, ops, &obj); 661 if (ret) 662 return ret; 663 664 drm_gem_private_object_init(dev, obj, size); 665 666 *res = to_etnaviv_bo(obj); 667 668 return 0; 669 } 670 671 static int etnaviv_gem_userptr_get_pages(struct etnaviv_gem_object *etnaviv_obj) 672 { 673 struct page **pvec = NULL; 674 struct etnaviv_gem_userptr *userptr = &etnaviv_obj->userptr; 675 int ret, pinned = 0, npages = etnaviv_obj->base.size >> PAGE_SHIFT; 676 677 might_lock_read(¤t->mm->mmap_lock); 678 679 if (userptr->mm != current->mm) 680 return -EPERM; 681 682 pvec = kvmalloc_array(npages, sizeof(struct page *), GFP_KERNEL); 683 if (!pvec) 684 return -ENOMEM; 685 686 do { 687 unsigned num_pages = npages - pinned; 688 uint64_t ptr = userptr->ptr + pinned * PAGE_SIZE; 689 struct page **pages = pvec + pinned; 690 691 ret = pin_user_pages_fast(ptr, num_pages, 692 !userptr->ro ? FOLL_WRITE : 0, pages); 693 if (ret < 0) { 694 unpin_user_pages(pvec, pinned); 695 kvfree(pvec); 696 return ret; 697 } 698 699 pinned += ret; 700 701 } while (pinned < npages); 702 703 etnaviv_obj->pages = pvec; 704 705 return 0; 706 } 707 708 static void etnaviv_gem_userptr_release(struct etnaviv_gem_object *etnaviv_obj) 709 { 710 if (etnaviv_obj->sgt) { 711 etnaviv_gem_scatterlist_unmap(etnaviv_obj); 712 sg_free_table(etnaviv_obj->sgt); 713 kfree(etnaviv_obj->sgt); 714 } 715 if (etnaviv_obj->pages) { 716 int npages = etnaviv_obj->base.size >> PAGE_SHIFT; 717 718 unpin_user_pages(etnaviv_obj->pages, npages); 719 kvfree(etnaviv_obj->pages); 720 } 721 } 722 723 static int etnaviv_gem_userptr_mmap_obj(struct etnaviv_gem_object *etnaviv_obj, 724 struct vm_area_struct *vma) 725 { 726 return -EINVAL; 727 } 728 729 static const struct etnaviv_gem_ops etnaviv_gem_userptr_ops = { 730 .get_pages = etnaviv_gem_userptr_get_pages, 731 .release = etnaviv_gem_userptr_release, 732 .vmap = etnaviv_gem_vmap_impl, 733 .mmap = etnaviv_gem_userptr_mmap_obj, 734 }; 735 736 int etnaviv_gem_new_userptr(struct drm_device *dev, struct drm_file *file, 737 uintptr_t ptr, u32 size, u32 flags, u32 *handle) 738 { 739 struct etnaviv_gem_object *etnaviv_obj; 740 int ret; 741 742 ret = etnaviv_gem_new_private(dev, size, ETNA_BO_CACHED, 743 &etnaviv_gem_userptr_ops, &etnaviv_obj); 744 if (ret) 745 return ret; 746 747 lockdep_set_class(&etnaviv_obj->lock, &etnaviv_userptr_lock_class); 748 749 etnaviv_obj->userptr.ptr = ptr; 750 etnaviv_obj->userptr.mm = current->mm; 751 etnaviv_obj->userptr.ro = !(flags & ETNA_USERPTR_WRITE); 752 753 etnaviv_gem_obj_add(dev, &etnaviv_obj->base); 754 755 ret = drm_gem_handle_create(file, &etnaviv_obj->base, handle); 756 757 /* drop reference from allocate - handle holds it now */ 758 drm_gem_object_put(&etnaviv_obj->base); 759 return ret; 760 } 761