1 /* 2 * Copyright (C) 2015 Etnaviv Project 3 * 4 * This program is free software; you can redistribute it and/or modify it 5 * under the terms of the GNU General Public License version 2 as published by 6 * the Free Software Foundation. 7 * 8 * This program is distributed in the hope that it will be useful, but WITHOUT 9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 11 * more details. 12 * 13 * You should have received a copy of the GNU General Public License along with 14 * this program. If not, see <http://www.gnu.org/licenses/>. 15 */ 16 17 #include <linux/spinlock.h> 18 #include <linux/shmem_fs.h> 19 20 #include "etnaviv_drv.h" 21 #include "etnaviv_gem.h" 22 #include "etnaviv_gpu.h" 23 #include "etnaviv_mmu.h" 24 25 static void etnaviv_gem_scatter_map(struct etnaviv_gem_object *etnaviv_obj) 26 { 27 struct drm_device *dev = etnaviv_obj->base.dev; 28 struct sg_table *sgt = etnaviv_obj->sgt; 29 30 /* 31 * For non-cached buffers, ensure the new pages are clean 32 * because display controller, GPU, etc. are not coherent. 33 */ 34 if (etnaviv_obj->flags & ETNA_BO_CACHE_MASK) 35 dma_map_sg(dev->dev, sgt->sgl, sgt->nents, DMA_BIDIRECTIONAL); 36 } 37 38 static void etnaviv_gem_scatterlist_unmap(struct etnaviv_gem_object *etnaviv_obj) 39 { 40 struct drm_device *dev = etnaviv_obj->base.dev; 41 struct sg_table *sgt = etnaviv_obj->sgt; 42 43 /* 44 * For non-cached buffers, ensure the new pages are clean 45 * because display controller, GPU, etc. are not coherent: 46 * 47 * WARNING: The DMA API does not support concurrent CPU 48 * and device access to the memory area. With BIDIRECTIONAL, 49 * we will clean the cache lines which overlap the region, 50 * and invalidate all cache lines (partially) contained in 51 * the region. 52 * 53 * If you have dirty data in the overlapping cache lines, 54 * that will corrupt the GPU-written data. If you have 55 * written into the remainder of the region, this can 56 * discard those writes. 57 */ 58 if (etnaviv_obj->flags & ETNA_BO_CACHE_MASK) 59 dma_unmap_sg(dev->dev, sgt->sgl, sgt->nents, DMA_BIDIRECTIONAL); 60 } 61 62 /* called with etnaviv_obj->lock held */ 63 static int etnaviv_gem_shmem_get_pages(struct etnaviv_gem_object *etnaviv_obj) 64 { 65 struct drm_device *dev = etnaviv_obj->base.dev; 66 struct page **p = drm_gem_get_pages(&etnaviv_obj->base); 67 68 if (IS_ERR(p)) { 69 dev_err(dev->dev, "could not get pages: %ld\n", PTR_ERR(p)); 70 return PTR_ERR(p); 71 } 72 73 etnaviv_obj->pages = p; 74 75 return 0; 76 } 77 78 static void put_pages(struct etnaviv_gem_object *etnaviv_obj) 79 { 80 if (etnaviv_obj->sgt) { 81 etnaviv_gem_scatterlist_unmap(etnaviv_obj); 82 sg_free_table(etnaviv_obj->sgt); 83 kfree(etnaviv_obj->sgt); 84 etnaviv_obj->sgt = NULL; 85 } 86 if (etnaviv_obj->pages) { 87 drm_gem_put_pages(&etnaviv_obj->base, etnaviv_obj->pages, 88 true, false); 89 90 etnaviv_obj->pages = NULL; 91 } 92 } 93 94 struct page **etnaviv_gem_get_pages(struct etnaviv_gem_object *etnaviv_obj) 95 { 96 int ret; 97 98 lockdep_assert_held(&etnaviv_obj->lock); 99 100 if (!etnaviv_obj->pages) { 101 ret = etnaviv_obj->ops->get_pages(etnaviv_obj); 102 if (ret < 0) 103 return ERR_PTR(ret); 104 } 105 106 if (!etnaviv_obj->sgt) { 107 struct drm_device *dev = etnaviv_obj->base.dev; 108 int npages = etnaviv_obj->base.size >> PAGE_SHIFT; 109 struct sg_table *sgt; 110 111 sgt = drm_prime_pages_to_sg(etnaviv_obj->pages, npages); 112 if (IS_ERR(sgt)) { 113 dev_err(dev->dev, "failed to allocate sgt: %ld\n", 114 PTR_ERR(sgt)); 115 return ERR_CAST(sgt); 116 } 117 118 etnaviv_obj->sgt = sgt; 119 120 etnaviv_gem_scatter_map(etnaviv_obj); 121 } 122 123 return etnaviv_obj->pages; 124 } 125 126 void etnaviv_gem_put_pages(struct etnaviv_gem_object *etnaviv_obj) 127 { 128 lockdep_assert_held(&etnaviv_obj->lock); 129 /* when we start tracking the pin count, then do something here */ 130 } 131 132 static int etnaviv_gem_mmap_obj(struct etnaviv_gem_object *etnaviv_obj, 133 struct vm_area_struct *vma) 134 { 135 pgprot_t vm_page_prot; 136 137 vma->vm_flags &= ~VM_PFNMAP; 138 vma->vm_flags |= VM_MIXEDMAP; 139 140 vm_page_prot = vm_get_page_prot(vma->vm_flags); 141 142 if (etnaviv_obj->flags & ETNA_BO_WC) { 143 vma->vm_page_prot = pgprot_writecombine(vm_page_prot); 144 } else if (etnaviv_obj->flags & ETNA_BO_UNCACHED) { 145 vma->vm_page_prot = pgprot_noncached(vm_page_prot); 146 } else { 147 /* 148 * Shunt off cached objs to shmem file so they have their own 149 * address_space (so unmap_mapping_range does what we want, 150 * in particular in the case of mmap'd dmabufs) 151 */ 152 fput(vma->vm_file); 153 get_file(etnaviv_obj->base.filp); 154 vma->vm_pgoff = 0; 155 vma->vm_file = etnaviv_obj->base.filp; 156 157 vma->vm_page_prot = vm_page_prot; 158 } 159 160 return 0; 161 } 162 163 int etnaviv_gem_mmap(struct file *filp, struct vm_area_struct *vma) 164 { 165 struct etnaviv_gem_object *obj; 166 int ret; 167 168 ret = drm_gem_mmap(filp, vma); 169 if (ret) { 170 DBG("mmap failed: %d", ret); 171 return ret; 172 } 173 174 obj = to_etnaviv_bo(vma->vm_private_data); 175 return obj->ops->mmap(obj, vma); 176 } 177 178 int etnaviv_gem_fault(struct vm_area_struct *vma, struct vm_fault *vmf) 179 { 180 struct drm_gem_object *obj = vma->vm_private_data; 181 struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj); 182 struct page **pages, *page; 183 pgoff_t pgoff; 184 int ret; 185 186 /* 187 * Make sure we don't parallel update on a fault, nor move or remove 188 * something from beneath our feet. Note that vm_insert_page() is 189 * specifically coded to take care of this, so we don't have to. 190 */ 191 ret = mutex_lock_interruptible(&etnaviv_obj->lock); 192 if (ret) 193 goto out; 194 195 /* make sure we have pages attached now */ 196 pages = etnaviv_gem_get_pages(etnaviv_obj); 197 mutex_unlock(&etnaviv_obj->lock); 198 199 if (IS_ERR(pages)) { 200 ret = PTR_ERR(pages); 201 goto out; 202 } 203 204 /* We don't use vmf->pgoff since that has the fake offset: */ 205 pgoff = ((unsigned long)vmf->virtual_address - 206 vma->vm_start) >> PAGE_SHIFT; 207 208 page = pages[pgoff]; 209 210 VERB("Inserting %p pfn %lx, pa %lx", vmf->virtual_address, 211 page_to_pfn(page), page_to_pfn(page) << PAGE_SHIFT); 212 213 ret = vm_insert_page(vma, (unsigned long)vmf->virtual_address, page); 214 215 out: 216 switch (ret) { 217 case -EAGAIN: 218 case 0: 219 case -ERESTARTSYS: 220 case -EINTR: 221 case -EBUSY: 222 /* 223 * EBUSY is ok: this just means that another thread 224 * already did the job. 225 */ 226 return VM_FAULT_NOPAGE; 227 case -ENOMEM: 228 return VM_FAULT_OOM; 229 default: 230 return VM_FAULT_SIGBUS; 231 } 232 } 233 234 int etnaviv_gem_mmap_offset(struct drm_gem_object *obj, u64 *offset) 235 { 236 int ret; 237 238 /* Make it mmapable */ 239 ret = drm_gem_create_mmap_offset(obj); 240 if (ret) 241 dev_err(obj->dev->dev, "could not allocate mmap offset\n"); 242 else 243 *offset = drm_vma_node_offset_addr(&obj->vma_node); 244 245 return ret; 246 } 247 248 static struct etnaviv_vram_mapping * 249 etnaviv_gem_get_vram_mapping(struct etnaviv_gem_object *obj, 250 struct etnaviv_iommu *mmu) 251 { 252 struct etnaviv_vram_mapping *mapping; 253 254 list_for_each_entry(mapping, &obj->vram_list, obj_node) { 255 if (mapping->mmu == mmu) 256 return mapping; 257 } 258 259 return NULL; 260 } 261 262 void etnaviv_gem_mapping_reference(struct etnaviv_vram_mapping *mapping) 263 { 264 struct etnaviv_gem_object *etnaviv_obj = mapping->object; 265 266 drm_gem_object_reference(&etnaviv_obj->base); 267 268 mutex_lock(&etnaviv_obj->lock); 269 WARN_ON(mapping->use == 0); 270 mapping->use += 1; 271 mutex_unlock(&etnaviv_obj->lock); 272 } 273 274 void etnaviv_gem_mapping_unreference(struct etnaviv_vram_mapping *mapping) 275 { 276 struct etnaviv_gem_object *etnaviv_obj = mapping->object; 277 278 mutex_lock(&etnaviv_obj->lock); 279 WARN_ON(mapping->use == 0); 280 mapping->use -= 1; 281 mutex_unlock(&etnaviv_obj->lock); 282 283 drm_gem_object_unreference_unlocked(&etnaviv_obj->base); 284 } 285 286 struct etnaviv_vram_mapping *etnaviv_gem_mapping_get( 287 struct drm_gem_object *obj, struct etnaviv_gpu *gpu) 288 { 289 struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj); 290 struct etnaviv_vram_mapping *mapping; 291 struct page **pages; 292 int ret = 0; 293 294 mutex_lock(&etnaviv_obj->lock); 295 mapping = etnaviv_gem_get_vram_mapping(etnaviv_obj, gpu->mmu); 296 if (mapping) { 297 /* 298 * Holding the object lock prevents the use count changing 299 * beneath us. If the use count is zero, the MMU might be 300 * reaping this object, so take the lock and re-check that 301 * the MMU owns this mapping to close this race. 302 */ 303 if (mapping->use == 0) { 304 mutex_lock(&gpu->mmu->lock); 305 if (mapping->mmu == gpu->mmu) 306 mapping->use += 1; 307 else 308 mapping = NULL; 309 mutex_unlock(&gpu->mmu->lock); 310 if (mapping) 311 goto out; 312 } else { 313 mapping->use += 1; 314 goto out; 315 } 316 } 317 318 pages = etnaviv_gem_get_pages(etnaviv_obj); 319 if (IS_ERR(pages)) { 320 ret = PTR_ERR(pages); 321 goto out; 322 } 323 324 /* 325 * See if we have a reaped vram mapping we can re-use before 326 * allocating a fresh mapping. 327 */ 328 mapping = etnaviv_gem_get_vram_mapping(etnaviv_obj, NULL); 329 if (!mapping) { 330 mapping = kzalloc(sizeof(*mapping), GFP_KERNEL); 331 if (!mapping) { 332 ret = -ENOMEM; 333 goto out; 334 } 335 336 INIT_LIST_HEAD(&mapping->scan_node); 337 mapping->object = etnaviv_obj; 338 } else { 339 list_del(&mapping->obj_node); 340 } 341 342 mapping->mmu = gpu->mmu; 343 mapping->use = 1; 344 345 ret = etnaviv_iommu_map_gem(gpu->mmu, etnaviv_obj, gpu->memory_base, 346 mapping); 347 if (ret < 0) 348 kfree(mapping); 349 else 350 list_add_tail(&mapping->obj_node, &etnaviv_obj->vram_list); 351 352 out: 353 mutex_unlock(&etnaviv_obj->lock); 354 355 if (ret) 356 return ERR_PTR(ret); 357 358 /* Take a reference on the object */ 359 drm_gem_object_reference(obj); 360 return mapping; 361 } 362 363 void *etnaviv_gem_vmap(struct drm_gem_object *obj) 364 { 365 struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj); 366 367 if (etnaviv_obj->vaddr) 368 return etnaviv_obj->vaddr; 369 370 mutex_lock(&etnaviv_obj->lock); 371 /* 372 * Need to check again, as we might have raced with another thread 373 * while waiting for the mutex. 374 */ 375 if (!etnaviv_obj->vaddr) 376 etnaviv_obj->vaddr = etnaviv_obj->ops->vmap(etnaviv_obj); 377 mutex_unlock(&etnaviv_obj->lock); 378 379 return etnaviv_obj->vaddr; 380 } 381 382 static void *etnaviv_gem_vmap_impl(struct etnaviv_gem_object *obj) 383 { 384 struct page **pages; 385 386 lockdep_assert_held(&obj->lock); 387 388 pages = etnaviv_gem_get_pages(obj); 389 if (IS_ERR(pages)) 390 return NULL; 391 392 return vmap(pages, obj->base.size >> PAGE_SHIFT, 393 VM_MAP, pgprot_writecombine(PAGE_KERNEL)); 394 } 395 396 static inline enum dma_data_direction etnaviv_op_to_dma_dir(u32 op) 397 { 398 if (op & ETNA_PREP_READ) 399 return DMA_FROM_DEVICE; 400 else if (op & ETNA_PREP_WRITE) 401 return DMA_TO_DEVICE; 402 else 403 return DMA_BIDIRECTIONAL; 404 } 405 406 int etnaviv_gem_cpu_prep(struct drm_gem_object *obj, u32 op, 407 struct timespec *timeout) 408 { 409 struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj); 410 struct drm_device *dev = obj->dev; 411 bool write = !!(op & ETNA_PREP_WRITE); 412 int ret; 413 414 if (op & ETNA_PREP_NOSYNC) { 415 if (!reservation_object_test_signaled_rcu(etnaviv_obj->resv, 416 write)) 417 return -EBUSY; 418 } else { 419 unsigned long remain = etnaviv_timeout_to_jiffies(timeout); 420 421 ret = reservation_object_wait_timeout_rcu(etnaviv_obj->resv, 422 write, true, remain); 423 if (ret <= 0) 424 return ret == 0 ? -ETIMEDOUT : ret; 425 } 426 427 if (etnaviv_obj->flags & ETNA_BO_CACHED) { 428 if (!etnaviv_obj->sgt) { 429 void *ret; 430 431 mutex_lock(&etnaviv_obj->lock); 432 ret = etnaviv_gem_get_pages(etnaviv_obj); 433 mutex_unlock(&etnaviv_obj->lock); 434 if (IS_ERR(ret)) 435 return PTR_ERR(ret); 436 } 437 438 dma_sync_sg_for_cpu(dev->dev, etnaviv_obj->sgt->sgl, 439 etnaviv_obj->sgt->nents, 440 etnaviv_op_to_dma_dir(op)); 441 etnaviv_obj->last_cpu_prep_op = op; 442 } 443 444 return 0; 445 } 446 447 int etnaviv_gem_cpu_fini(struct drm_gem_object *obj) 448 { 449 struct drm_device *dev = obj->dev; 450 struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj); 451 452 if (etnaviv_obj->flags & ETNA_BO_CACHED) { 453 /* fini without a prep is almost certainly a userspace error */ 454 WARN_ON(etnaviv_obj->last_cpu_prep_op == 0); 455 dma_sync_sg_for_device(dev->dev, etnaviv_obj->sgt->sgl, 456 etnaviv_obj->sgt->nents, 457 etnaviv_op_to_dma_dir(etnaviv_obj->last_cpu_prep_op)); 458 etnaviv_obj->last_cpu_prep_op = 0; 459 } 460 461 return 0; 462 } 463 464 int etnaviv_gem_wait_bo(struct etnaviv_gpu *gpu, struct drm_gem_object *obj, 465 struct timespec *timeout) 466 { 467 struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj); 468 469 return etnaviv_gpu_wait_obj_inactive(gpu, etnaviv_obj, timeout); 470 } 471 472 #ifdef CONFIG_DEBUG_FS 473 static void etnaviv_gem_describe_fence(struct fence *fence, 474 const char *type, struct seq_file *m) 475 { 476 if (!test_bit(FENCE_FLAG_SIGNALED_BIT, &fence->flags)) 477 seq_printf(m, "\t%9s: %s %s seq %u\n", 478 type, 479 fence->ops->get_driver_name(fence), 480 fence->ops->get_timeline_name(fence), 481 fence->seqno); 482 } 483 484 static void etnaviv_gem_describe(struct drm_gem_object *obj, struct seq_file *m) 485 { 486 struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj); 487 struct reservation_object *robj = etnaviv_obj->resv; 488 struct reservation_object_list *fobj; 489 struct fence *fence; 490 unsigned long off = drm_vma_node_start(&obj->vma_node); 491 492 seq_printf(m, "%08x: %c %2d (%2d) %08lx %p %zd\n", 493 etnaviv_obj->flags, is_active(etnaviv_obj) ? 'A' : 'I', 494 obj->name, obj->refcount.refcount.counter, 495 off, etnaviv_obj->vaddr, obj->size); 496 497 rcu_read_lock(); 498 fobj = rcu_dereference(robj->fence); 499 if (fobj) { 500 unsigned int i, shared_count = fobj->shared_count; 501 502 for (i = 0; i < shared_count; i++) { 503 fence = rcu_dereference(fobj->shared[i]); 504 etnaviv_gem_describe_fence(fence, "Shared", m); 505 } 506 } 507 508 fence = rcu_dereference(robj->fence_excl); 509 if (fence) 510 etnaviv_gem_describe_fence(fence, "Exclusive", m); 511 rcu_read_unlock(); 512 } 513 514 void etnaviv_gem_describe_objects(struct etnaviv_drm_private *priv, 515 struct seq_file *m) 516 { 517 struct etnaviv_gem_object *etnaviv_obj; 518 int count = 0; 519 size_t size = 0; 520 521 mutex_lock(&priv->gem_lock); 522 list_for_each_entry(etnaviv_obj, &priv->gem_list, gem_node) { 523 struct drm_gem_object *obj = &etnaviv_obj->base; 524 525 seq_puts(m, " "); 526 etnaviv_gem_describe(obj, m); 527 count++; 528 size += obj->size; 529 } 530 mutex_unlock(&priv->gem_lock); 531 532 seq_printf(m, "Total %d objects, %zu bytes\n", count, size); 533 } 534 #endif 535 536 static void etnaviv_gem_shmem_release(struct etnaviv_gem_object *etnaviv_obj) 537 { 538 vunmap(etnaviv_obj->vaddr); 539 put_pages(etnaviv_obj); 540 } 541 542 static const struct etnaviv_gem_ops etnaviv_gem_shmem_ops = { 543 .get_pages = etnaviv_gem_shmem_get_pages, 544 .release = etnaviv_gem_shmem_release, 545 .vmap = etnaviv_gem_vmap_impl, 546 .mmap = etnaviv_gem_mmap_obj, 547 }; 548 549 void etnaviv_gem_free_object(struct drm_gem_object *obj) 550 { 551 struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj); 552 struct etnaviv_vram_mapping *mapping, *tmp; 553 554 /* object should not be active */ 555 WARN_ON(is_active(etnaviv_obj)); 556 557 list_del(&etnaviv_obj->gem_node); 558 559 list_for_each_entry_safe(mapping, tmp, &etnaviv_obj->vram_list, 560 obj_node) { 561 struct etnaviv_iommu *mmu = mapping->mmu; 562 563 WARN_ON(mapping->use); 564 565 if (mmu) 566 etnaviv_iommu_unmap_gem(mmu, mapping); 567 568 list_del(&mapping->obj_node); 569 kfree(mapping); 570 } 571 572 drm_gem_free_mmap_offset(obj); 573 etnaviv_obj->ops->release(etnaviv_obj); 574 if (etnaviv_obj->resv == &etnaviv_obj->_resv) 575 reservation_object_fini(&etnaviv_obj->_resv); 576 drm_gem_object_release(obj); 577 578 kfree(etnaviv_obj); 579 } 580 581 int etnaviv_gem_obj_add(struct drm_device *dev, struct drm_gem_object *obj) 582 { 583 struct etnaviv_drm_private *priv = dev->dev_private; 584 struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj); 585 586 mutex_lock(&priv->gem_lock); 587 list_add_tail(&etnaviv_obj->gem_node, &priv->gem_list); 588 mutex_unlock(&priv->gem_lock); 589 590 return 0; 591 } 592 593 static int etnaviv_gem_new_impl(struct drm_device *dev, u32 size, u32 flags, 594 struct reservation_object *robj, const struct etnaviv_gem_ops *ops, 595 struct drm_gem_object **obj) 596 { 597 struct etnaviv_gem_object *etnaviv_obj; 598 unsigned sz = sizeof(*etnaviv_obj); 599 bool valid = true; 600 601 /* validate flags */ 602 switch (flags & ETNA_BO_CACHE_MASK) { 603 case ETNA_BO_UNCACHED: 604 case ETNA_BO_CACHED: 605 case ETNA_BO_WC: 606 break; 607 default: 608 valid = false; 609 } 610 611 if (!valid) { 612 dev_err(dev->dev, "invalid cache flag: %x\n", 613 (flags & ETNA_BO_CACHE_MASK)); 614 return -EINVAL; 615 } 616 617 etnaviv_obj = kzalloc(sz, GFP_KERNEL); 618 if (!etnaviv_obj) 619 return -ENOMEM; 620 621 etnaviv_obj->flags = flags; 622 etnaviv_obj->ops = ops; 623 if (robj) { 624 etnaviv_obj->resv = robj; 625 } else { 626 etnaviv_obj->resv = &etnaviv_obj->_resv; 627 reservation_object_init(&etnaviv_obj->_resv); 628 } 629 630 mutex_init(&etnaviv_obj->lock); 631 INIT_LIST_HEAD(&etnaviv_obj->vram_list); 632 633 *obj = &etnaviv_obj->base; 634 635 return 0; 636 } 637 638 static struct drm_gem_object *__etnaviv_gem_new(struct drm_device *dev, 639 u32 size, u32 flags) 640 { 641 struct drm_gem_object *obj = NULL; 642 int ret; 643 644 size = PAGE_ALIGN(size); 645 646 ret = etnaviv_gem_new_impl(dev, size, flags, NULL, 647 &etnaviv_gem_shmem_ops, &obj); 648 if (ret) 649 goto fail; 650 651 ret = drm_gem_object_init(dev, obj, size); 652 if (ret == 0) { 653 struct address_space *mapping; 654 655 /* 656 * Our buffers are kept pinned, so allocating them 657 * from the MOVABLE zone is a really bad idea, and 658 * conflicts with CMA. See coments above new_inode() 659 * why this is required _and_ expected if you're 660 * going to pin these pages. 661 */ 662 mapping = obj->filp->f_mapping; 663 mapping_set_gfp_mask(mapping, GFP_HIGHUSER); 664 } 665 666 if (ret) 667 goto fail; 668 669 return obj; 670 671 fail: 672 drm_gem_object_unreference_unlocked(obj); 673 return ERR_PTR(ret); 674 } 675 676 /* convenience method to construct a GEM buffer object, and userspace handle */ 677 int etnaviv_gem_new_handle(struct drm_device *dev, struct drm_file *file, 678 u32 size, u32 flags, u32 *handle) 679 { 680 struct drm_gem_object *obj; 681 int ret; 682 683 obj = __etnaviv_gem_new(dev, size, flags); 684 if (IS_ERR(obj)) 685 return PTR_ERR(obj); 686 687 ret = etnaviv_gem_obj_add(dev, obj); 688 if (ret < 0) { 689 drm_gem_object_unreference_unlocked(obj); 690 return ret; 691 } 692 693 ret = drm_gem_handle_create(file, obj, handle); 694 695 /* drop reference from allocate - handle holds it now */ 696 drm_gem_object_unreference_unlocked(obj); 697 698 return ret; 699 } 700 701 struct drm_gem_object *etnaviv_gem_new(struct drm_device *dev, 702 u32 size, u32 flags) 703 { 704 struct drm_gem_object *obj; 705 int ret; 706 707 obj = __etnaviv_gem_new(dev, size, flags); 708 if (IS_ERR(obj)) 709 return obj; 710 711 ret = etnaviv_gem_obj_add(dev, obj); 712 if (ret < 0) { 713 drm_gem_object_unreference_unlocked(obj); 714 return ERR_PTR(ret); 715 } 716 717 return obj; 718 } 719 720 int etnaviv_gem_new_private(struct drm_device *dev, size_t size, u32 flags, 721 struct reservation_object *robj, const struct etnaviv_gem_ops *ops, 722 struct etnaviv_gem_object **res) 723 { 724 struct drm_gem_object *obj; 725 int ret; 726 727 ret = etnaviv_gem_new_impl(dev, size, flags, robj, ops, &obj); 728 if (ret) 729 return ret; 730 731 drm_gem_private_object_init(dev, obj, size); 732 733 *res = to_etnaviv_bo(obj); 734 735 return 0; 736 } 737 738 struct get_pages_work { 739 struct work_struct work; 740 struct mm_struct *mm; 741 struct task_struct *task; 742 struct etnaviv_gem_object *etnaviv_obj; 743 }; 744 745 static struct page **etnaviv_gem_userptr_do_get_pages( 746 struct etnaviv_gem_object *etnaviv_obj, struct mm_struct *mm, struct task_struct *task) 747 { 748 int ret = 0, pinned, npages = etnaviv_obj->base.size >> PAGE_SHIFT; 749 struct page **pvec; 750 uintptr_t ptr; 751 752 pvec = drm_malloc_ab(npages, sizeof(struct page *)); 753 if (!pvec) 754 return ERR_PTR(-ENOMEM); 755 756 pinned = 0; 757 ptr = etnaviv_obj->userptr.ptr; 758 759 down_read(&mm->mmap_sem); 760 while (pinned < npages) { 761 ret = get_user_pages_remote(task, mm, ptr, npages - pinned, 762 !etnaviv_obj->userptr.ro, 0, 763 pvec + pinned, NULL); 764 if (ret < 0) 765 break; 766 767 ptr += ret * PAGE_SIZE; 768 pinned += ret; 769 } 770 up_read(&mm->mmap_sem); 771 772 if (ret < 0) { 773 release_pages(pvec, pinned, 0); 774 drm_free_large(pvec); 775 return ERR_PTR(ret); 776 } 777 778 return pvec; 779 } 780 781 static void __etnaviv_gem_userptr_get_pages(struct work_struct *_work) 782 { 783 struct get_pages_work *work = container_of(_work, typeof(*work), work); 784 struct etnaviv_gem_object *etnaviv_obj = work->etnaviv_obj; 785 struct page **pvec; 786 787 pvec = etnaviv_gem_userptr_do_get_pages(etnaviv_obj, work->mm, work->task); 788 789 mutex_lock(&etnaviv_obj->lock); 790 if (IS_ERR(pvec)) { 791 etnaviv_obj->userptr.work = ERR_CAST(pvec); 792 } else { 793 etnaviv_obj->userptr.work = NULL; 794 etnaviv_obj->pages = pvec; 795 } 796 797 mutex_unlock(&etnaviv_obj->lock); 798 drm_gem_object_unreference_unlocked(&etnaviv_obj->base); 799 800 mmput(work->mm); 801 put_task_struct(work->task); 802 kfree(work); 803 } 804 805 static int etnaviv_gem_userptr_get_pages(struct etnaviv_gem_object *etnaviv_obj) 806 { 807 struct page **pvec = NULL; 808 struct get_pages_work *work; 809 struct mm_struct *mm; 810 int ret, pinned, npages = etnaviv_obj->base.size >> PAGE_SHIFT; 811 812 if (etnaviv_obj->userptr.work) { 813 if (IS_ERR(etnaviv_obj->userptr.work)) { 814 ret = PTR_ERR(etnaviv_obj->userptr.work); 815 etnaviv_obj->userptr.work = NULL; 816 } else { 817 ret = -EAGAIN; 818 } 819 return ret; 820 } 821 822 mm = get_task_mm(etnaviv_obj->userptr.task); 823 pinned = 0; 824 if (mm == current->mm) { 825 pvec = drm_malloc_ab(npages, sizeof(struct page *)); 826 if (!pvec) { 827 mmput(mm); 828 return -ENOMEM; 829 } 830 831 pinned = __get_user_pages_fast(etnaviv_obj->userptr.ptr, npages, 832 !etnaviv_obj->userptr.ro, pvec); 833 if (pinned < 0) { 834 drm_free_large(pvec); 835 mmput(mm); 836 return pinned; 837 } 838 839 if (pinned == npages) { 840 etnaviv_obj->pages = pvec; 841 mmput(mm); 842 return 0; 843 } 844 } 845 846 release_pages(pvec, pinned, 0); 847 drm_free_large(pvec); 848 849 work = kmalloc(sizeof(*work), GFP_KERNEL); 850 if (!work) { 851 mmput(mm); 852 return -ENOMEM; 853 } 854 855 get_task_struct(current); 856 drm_gem_object_reference(&etnaviv_obj->base); 857 858 work->mm = mm; 859 work->task = current; 860 work->etnaviv_obj = etnaviv_obj; 861 862 etnaviv_obj->userptr.work = &work->work; 863 INIT_WORK(&work->work, __etnaviv_gem_userptr_get_pages); 864 865 etnaviv_queue_work(etnaviv_obj->base.dev, &work->work); 866 867 return -EAGAIN; 868 } 869 870 static void etnaviv_gem_userptr_release(struct etnaviv_gem_object *etnaviv_obj) 871 { 872 if (etnaviv_obj->sgt) { 873 etnaviv_gem_scatterlist_unmap(etnaviv_obj); 874 sg_free_table(etnaviv_obj->sgt); 875 kfree(etnaviv_obj->sgt); 876 } 877 if (etnaviv_obj->pages) { 878 int npages = etnaviv_obj->base.size >> PAGE_SHIFT; 879 880 release_pages(etnaviv_obj->pages, npages, 0); 881 drm_free_large(etnaviv_obj->pages); 882 } 883 put_task_struct(etnaviv_obj->userptr.task); 884 } 885 886 static int etnaviv_gem_userptr_mmap_obj(struct etnaviv_gem_object *etnaviv_obj, 887 struct vm_area_struct *vma) 888 { 889 return -EINVAL; 890 } 891 892 static const struct etnaviv_gem_ops etnaviv_gem_userptr_ops = { 893 .get_pages = etnaviv_gem_userptr_get_pages, 894 .release = etnaviv_gem_userptr_release, 895 .vmap = etnaviv_gem_vmap_impl, 896 .mmap = etnaviv_gem_userptr_mmap_obj, 897 }; 898 899 int etnaviv_gem_new_userptr(struct drm_device *dev, struct drm_file *file, 900 uintptr_t ptr, u32 size, u32 flags, u32 *handle) 901 { 902 struct etnaviv_gem_object *etnaviv_obj; 903 int ret; 904 905 ret = etnaviv_gem_new_private(dev, size, ETNA_BO_CACHED, NULL, 906 &etnaviv_gem_userptr_ops, &etnaviv_obj); 907 if (ret) 908 return ret; 909 910 etnaviv_obj->userptr.ptr = ptr; 911 etnaviv_obj->userptr.task = current; 912 etnaviv_obj->userptr.ro = !(flags & ETNA_USERPTR_WRITE); 913 get_task_struct(current); 914 915 ret = etnaviv_gem_obj_add(dev, &etnaviv_obj->base); 916 if (ret) 917 goto unreference; 918 919 ret = drm_gem_handle_create(file, &etnaviv_obj->base, handle); 920 unreference: 921 /* drop reference from allocate - handle holds it now */ 922 drm_gem_object_unreference_unlocked(&etnaviv_obj->base); 923 return ret; 924 } 925