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 #include <linux/sched/mm.h> 20 #include <linux/sched/task.h> 21 22 #include "etnaviv_drv.h" 23 #include "etnaviv_gem.h" 24 #include "etnaviv_gpu.h" 25 #include "etnaviv_mmu.h" 26 27 static void etnaviv_gem_scatter_map(struct etnaviv_gem_object *etnaviv_obj) 28 { 29 struct drm_device *dev = etnaviv_obj->base.dev; 30 struct sg_table *sgt = etnaviv_obj->sgt; 31 32 /* 33 * For non-cached buffers, ensure the new pages are clean 34 * because display controller, GPU, etc. are not coherent. 35 */ 36 if (etnaviv_obj->flags & ETNA_BO_CACHE_MASK) 37 dma_map_sg(dev->dev, sgt->sgl, sgt->nents, DMA_BIDIRECTIONAL); 38 } 39 40 static void etnaviv_gem_scatterlist_unmap(struct etnaviv_gem_object *etnaviv_obj) 41 { 42 struct drm_device *dev = etnaviv_obj->base.dev; 43 struct sg_table *sgt = etnaviv_obj->sgt; 44 45 /* 46 * For non-cached buffers, ensure the new pages are clean 47 * because display controller, GPU, etc. are not coherent: 48 * 49 * WARNING: The DMA API does not support concurrent CPU 50 * and device access to the memory area. With BIDIRECTIONAL, 51 * we will clean the cache lines which overlap the region, 52 * and invalidate all cache lines (partially) contained in 53 * the region. 54 * 55 * If you have dirty data in the overlapping cache lines, 56 * that will corrupt the GPU-written data. If you have 57 * written into the remainder of the region, this can 58 * discard those writes. 59 */ 60 if (etnaviv_obj->flags & ETNA_BO_CACHE_MASK) 61 dma_unmap_sg(dev->dev, sgt->sgl, sgt->nents, DMA_BIDIRECTIONAL); 62 } 63 64 /* called with etnaviv_obj->lock held */ 65 static int etnaviv_gem_shmem_get_pages(struct etnaviv_gem_object *etnaviv_obj) 66 { 67 struct drm_device *dev = etnaviv_obj->base.dev; 68 struct page **p = drm_gem_get_pages(&etnaviv_obj->base); 69 70 if (IS_ERR(p)) { 71 dev_dbg(dev->dev, "could not get pages: %ld\n", PTR_ERR(p)); 72 return PTR_ERR(p); 73 } 74 75 etnaviv_obj->pages = p; 76 77 return 0; 78 } 79 80 static void put_pages(struct etnaviv_gem_object *etnaviv_obj) 81 { 82 if (etnaviv_obj->sgt) { 83 etnaviv_gem_scatterlist_unmap(etnaviv_obj); 84 sg_free_table(etnaviv_obj->sgt); 85 kfree(etnaviv_obj->sgt); 86 etnaviv_obj->sgt = NULL; 87 } 88 if (etnaviv_obj->pages) { 89 drm_gem_put_pages(&etnaviv_obj->base, etnaviv_obj->pages, 90 true, false); 91 92 etnaviv_obj->pages = NULL; 93 } 94 } 95 96 struct page **etnaviv_gem_get_pages(struct etnaviv_gem_object *etnaviv_obj) 97 { 98 int ret; 99 100 lockdep_assert_held(&etnaviv_obj->lock); 101 102 if (!etnaviv_obj->pages) { 103 ret = etnaviv_obj->ops->get_pages(etnaviv_obj); 104 if (ret < 0) 105 return ERR_PTR(ret); 106 } 107 108 if (!etnaviv_obj->sgt) { 109 struct drm_device *dev = etnaviv_obj->base.dev; 110 int npages = etnaviv_obj->base.size >> PAGE_SHIFT; 111 struct sg_table *sgt; 112 113 sgt = drm_prime_pages_to_sg(etnaviv_obj->pages, npages); 114 if (IS_ERR(sgt)) { 115 dev_err(dev->dev, "failed to allocate sgt: %ld\n", 116 PTR_ERR(sgt)); 117 return ERR_CAST(sgt); 118 } 119 120 etnaviv_obj->sgt = sgt; 121 122 etnaviv_gem_scatter_map(etnaviv_obj); 123 } 124 125 return etnaviv_obj->pages; 126 } 127 128 void etnaviv_gem_put_pages(struct etnaviv_gem_object *etnaviv_obj) 129 { 130 lockdep_assert_held(&etnaviv_obj->lock); 131 /* when we start tracking the pin count, then do something here */ 132 } 133 134 static int etnaviv_gem_mmap_obj(struct etnaviv_gem_object *etnaviv_obj, 135 struct vm_area_struct *vma) 136 { 137 pgprot_t vm_page_prot; 138 139 vma->vm_flags &= ~VM_PFNMAP; 140 vma->vm_flags |= VM_MIXEDMAP; 141 142 vm_page_prot = vm_get_page_prot(vma->vm_flags); 143 144 if (etnaviv_obj->flags & ETNA_BO_WC) { 145 vma->vm_page_prot = pgprot_writecombine(vm_page_prot); 146 } else if (etnaviv_obj->flags & ETNA_BO_UNCACHED) { 147 vma->vm_page_prot = pgprot_noncached(vm_page_prot); 148 } else { 149 /* 150 * Shunt off cached objs to shmem file so they have their own 151 * address_space (so unmap_mapping_range does what we want, 152 * in particular in the case of mmap'd dmabufs) 153 */ 154 fput(vma->vm_file); 155 get_file(etnaviv_obj->base.filp); 156 vma->vm_pgoff = 0; 157 vma->vm_file = etnaviv_obj->base.filp; 158 159 vma->vm_page_prot = vm_page_prot; 160 } 161 162 return 0; 163 } 164 165 int etnaviv_gem_mmap(struct file *filp, struct vm_area_struct *vma) 166 { 167 struct etnaviv_gem_object *obj; 168 int ret; 169 170 ret = drm_gem_mmap(filp, vma); 171 if (ret) { 172 DBG("mmap failed: %d", ret); 173 return ret; 174 } 175 176 obj = to_etnaviv_bo(vma->vm_private_data); 177 return obj->ops->mmap(obj, vma); 178 } 179 180 int etnaviv_gem_fault(struct vm_fault *vmf) 181 { 182 struct vm_area_struct *vma = vmf->vma; 183 struct drm_gem_object *obj = vma->vm_private_data; 184 struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj); 185 struct page **pages, *page; 186 pgoff_t pgoff; 187 int ret; 188 189 /* 190 * Make sure we don't parallel update on a fault, nor move or remove 191 * something from beneath our feet. Note that vm_insert_page() is 192 * specifically coded to take care of this, so we don't have to. 193 */ 194 ret = mutex_lock_interruptible(&etnaviv_obj->lock); 195 if (ret) 196 goto out; 197 198 /* make sure we have pages attached now */ 199 pages = etnaviv_gem_get_pages(etnaviv_obj); 200 mutex_unlock(&etnaviv_obj->lock); 201 202 if (IS_ERR(pages)) { 203 ret = PTR_ERR(pages); 204 goto out; 205 } 206 207 /* We don't use vmf->pgoff since that has the fake offset: */ 208 pgoff = (vmf->address - vma->vm_start) >> PAGE_SHIFT; 209 210 page = pages[pgoff]; 211 212 VERB("Inserting %p pfn %lx, pa %lx", (void *)vmf->address, 213 page_to_pfn(page), page_to_pfn(page) << PAGE_SHIFT); 214 215 ret = vm_insert_page(vma, vmf->address, page); 216 217 out: 218 switch (ret) { 219 case -EAGAIN: 220 case 0: 221 case -ERESTARTSYS: 222 case -EINTR: 223 case -EBUSY: 224 /* 225 * EBUSY is ok: this just means that another thread 226 * already did the job. 227 */ 228 return VM_FAULT_NOPAGE; 229 case -ENOMEM: 230 return VM_FAULT_OOM; 231 default: 232 return VM_FAULT_SIGBUS; 233 } 234 } 235 236 int etnaviv_gem_mmap_offset(struct drm_gem_object *obj, u64 *offset) 237 { 238 int ret; 239 240 /* Make it mmapable */ 241 ret = drm_gem_create_mmap_offset(obj); 242 if (ret) 243 dev_err(obj->dev->dev, "could not allocate mmap offset\n"); 244 else 245 *offset = drm_vma_node_offset_addr(&obj->vma_node); 246 247 return ret; 248 } 249 250 static struct etnaviv_vram_mapping * 251 etnaviv_gem_get_vram_mapping(struct etnaviv_gem_object *obj, 252 struct etnaviv_iommu *mmu) 253 { 254 struct etnaviv_vram_mapping *mapping; 255 256 list_for_each_entry(mapping, &obj->vram_list, obj_node) { 257 if (mapping->mmu == mmu) 258 return mapping; 259 } 260 261 return NULL; 262 } 263 264 void etnaviv_gem_mapping_reference(struct etnaviv_vram_mapping *mapping) 265 { 266 struct etnaviv_gem_object *etnaviv_obj = mapping->object; 267 268 drm_gem_object_get(&etnaviv_obj->base); 269 270 mutex_lock(&etnaviv_obj->lock); 271 WARN_ON(mapping->use == 0); 272 mapping->use += 1; 273 mutex_unlock(&etnaviv_obj->lock); 274 } 275 276 void etnaviv_gem_mapping_unreference(struct etnaviv_vram_mapping *mapping) 277 { 278 struct etnaviv_gem_object *etnaviv_obj = mapping->object; 279 280 mutex_lock(&etnaviv_obj->lock); 281 WARN_ON(mapping->use == 0); 282 mapping->use -= 1; 283 mutex_unlock(&etnaviv_obj->lock); 284 285 drm_gem_object_put_unlocked(&etnaviv_obj->base); 286 } 287 288 struct etnaviv_vram_mapping *etnaviv_gem_mapping_get( 289 struct drm_gem_object *obj, struct etnaviv_gpu *gpu) 290 { 291 struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj); 292 struct etnaviv_vram_mapping *mapping; 293 struct page **pages; 294 int ret = 0; 295 296 mutex_lock(&etnaviv_obj->lock); 297 mapping = etnaviv_gem_get_vram_mapping(etnaviv_obj, gpu->mmu); 298 if (mapping) { 299 /* 300 * Holding the object lock prevents the use count changing 301 * beneath us. If the use count is zero, the MMU might be 302 * reaping this object, so take the lock and re-check that 303 * the MMU owns this mapping to close this race. 304 */ 305 if (mapping->use == 0) { 306 mutex_lock(&gpu->mmu->lock); 307 if (mapping->mmu == gpu->mmu) 308 mapping->use += 1; 309 else 310 mapping = NULL; 311 mutex_unlock(&gpu->mmu->lock); 312 if (mapping) 313 goto out; 314 } else { 315 mapping->use += 1; 316 goto out; 317 } 318 } 319 320 pages = etnaviv_gem_get_pages(etnaviv_obj); 321 if (IS_ERR(pages)) { 322 ret = PTR_ERR(pages); 323 goto out; 324 } 325 326 /* 327 * See if we have a reaped vram mapping we can re-use before 328 * allocating a fresh mapping. 329 */ 330 mapping = etnaviv_gem_get_vram_mapping(etnaviv_obj, NULL); 331 if (!mapping) { 332 mapping = kzalloc(sizeof(*mapping), GFP_KERNEL); 333 if (!mapping) { 334 ret = -ENOMEM; 335 goto out; 336 } 337 338 INIT_LIST_HEAD(&mapping->scan_node); 339 mapping->object = etnaviv_obj; 340 } else { 341 list_del(&mapping->obj_node); 342 } 343 344 mapping->mmu = gpu->mmu; 345 mapping->use = 1; 346 347 ret = etnaviv_iommu_map_gem(gpu->mmu, etnaviv_obj, gpu->memory_base, 348 mapping); 349 if (ret < 0) 350 kfree(mapping); 351 else 352 list_add_tail(&mapping->obj_node, &etnaviv_obj->vram_list); 353 354 out: 355 mutex_unlock(&etnaviv_obj->lock); 356 357 if (ret) 358 return ERR_PTR(ret); 359 360 /* Take a reference on the object */ 361 drm_gem_object_get(obj); 362 return mapping; 363 } 364 365 void *etnaviv_gem_vmap(struct drm_gem_object *obj) 366 { 367 struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj); 368 369 if (etnaviv_obj->vaddr) 370 return etnaviv_obj->vaddr; 371 372 mutex_lock(&etnaviv_obj->lock); 373 /* 374 * Need to check again, as we might have raced with another thread 375 * while waiting for the mutex. 376 */ 377 if (!etnaviv_obj->vaddr) 378 etnaviv_obj->vaddr = etnaviv_obj->ops->vmap(etnaviv_obj); 379 mutex_unlock(&etnaviv_obj->lock); 380 381 return etnaviv_obj->vaddr; 382 } 383 384 static void *etnaviv_gem_vmap_impl(struct etnaviv_gem_object *obj) 385 { 386 struct page **pages; 387 388 lockdep_assert_held(&obj->lock); 389 390 pages = etnaviv_gem_get_pages(obj); 391 if (IS_ERR(pages)) 392 return NULL; 393 394 return vmap(pages, obj->base.size >> PAGE_SHIFT, 395 VM_MAP, pgprot_writecombine(PAGE_KERNEL)); 396 } 397 398 static inline enum dma_data_direction etnaviv_op_to_dma_dir(u32 op) 399 { 400 if (op & ETNA_PREP_READ) 401 return DMA_FROM_DEVICE; 402 else if (op & ETNA_PREP_WRITE) 403 return DMA_TO_DEVICE; 404 else 405 return DMA_BIDIRECTIONAL; 406 } 407 408 int etnaviv_gem_cpu_prep(struct drm_gem_object *obj, u32 op, 409 struct timespec *timeout) 410 { 411 struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj); 412 struct drm_device *dev = obj->dev; 413 bool write = !!(op & ETNA_PREP_WRITE); 414 int ret; 415 416 if (!etnaviv_obj->sgt) { 417 void *ret; 418 419 mutex_lock(&etnaviv_obj->lock); 420 ret = etnaviv_gem_get_pages(etnaviv_obj); 421 mutex_unlock(&etnaviv_obj->lock); 422 if (IS_ERR(ret)) 423 return PTR_ERR(ret); 424 } 425 426 if (op & ETNA_PREP_NOSYNC) { 427 if (!reservation_object_test_signaled_rcu(etnaviv_obj->resv, 428 write)) 429 return -EBUSY; 430 } else { 431 unsigned long remain = etnaviv_timeout_to_jiffies(timeout); 432 433 ret = reservation_object_wait_timeout_rcu(etnaviv_obj->resv, 434 write, true, remain); 435 if (ret <= 0) 436 return ret == 0 ? -ETIMEDOUT : ret; 437 } 438 439 if (etnaviv_obj->flags & ETNA_BO_CACHED) { 440 dma_sync_sg_for_cpu(dev->dev, etnaviv_obj->sgt->sgl, 441 etnaviv_obj->sgt->nents, 442 etnaviv_op_to_dma_dir(op)); 443 etnaviv_obj->last_cpu_prep_op = op; 444 } 445 446 return 0; 447 } 448 449 int etnaviv_gem_cpu_fini(struct drm_gem_object *obj) 450 { 451 struct drm_device *dev = obj->dev; 452 struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj); 453 454 if (etnaviv_obj->flags & ETNA_BO_CACHED) { 455 /* fini without a prep is almost certainly a userspace error */ 456 WARN_ON(etnaviv_obj->last_cpu_prep_op == 0); 457 dma_sync_sg_for_device(dev->dev, etnaviv_obj->sgt->sgl, 458 etnaviv_obj->sgt->nents, 459 etnaviv_op_to_dma_dir(etnaviv_obj->last_cpu_prep_op)); 460 etnaviv_obj->last_cpu_prep_op = 0; 461 } 462 463 return 0; 464 } 465 466 int etnaviv_gem_wait_bo(struct etnaviv_gpu *gpu, struct drm_gem_object *obj, 467 struct timespec *timeout) 468 { 469 struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj); 470 471 return etnaviv_gpu_wait_obj_inactive(gpu, etnaviv_obj, timeout); 472 } 473 474 #ifdef CONFIG_DEBUG_FS 475 static void etnaviv_gem_describe_fence(struct dma_fence *fence, 476 const char *type, struct seq_file *m) 477 { 478 if (!test_bit(DMA_FENCE_FLAG_SIGNALED_BIT, &fence->flags)) 479 seq_printf(m, "\t%9s: %s %s seq %u\n", 480 type, 481 fence->ops->get_driver_name(fence), 482 fence->ops->get_timeline_name(fence), 483 fence->seqno); 484 } 485 486 static void etnaviv_gem_describe(struct drm_gem_object *obj, struct seq_file *m) 487 { 488 struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj); 489 struct reservation_object *robj = etnaviv_obj->resv; 490 struct reservation_object_list *fobj; 491 struct dma_fence *fence; 492 unsigned long off = drm_vma_node_start(&obj->vma_node); 493 494 seq_printf(m, "%08x: %c %2d (%2d) %08lx %p %zd\n", 495 etnaviv_obj->flags, is_active(etnaviv_obj) ? 'A' : 'I', 496 obj->name, kref_read(&obj->refcount), 497 off, etnaviv_obj->vaddr, obj->size); 498 499 rcu_read_lock(); 500 fobj = rcu_dereference(robj->fence); 501 if (fobj) { 502 unsigned int i, shared_count = fobj->shared_count; 503 504 for (i = 0; i < shared_count; i++) { 505 fence = rcu_dereference(fobj->shared[i]); 506 etnaviv_gem_describe_fence(fence, "Shared", m); 507 } 508 } 509 510 fence = rcu_dereference(robj->fence_excl); 511 if (fence) 512 etnaviv_gem_describe_fence(fence, "Exclusive", m); 513 rcu_read_unlock(); 514 } 515 516 void etnaviv_gem_describe_objects(struct etnaviv_drm_private *priv, 517 struct seq_file *m) 518 { 519 struct etnaviv_gem_object *etnaviv_obj; 520 int count = 0; 521 size_t size = 0; 522 523 mutex_lock(&priv->gem_lock); 524 list_for_each_entry(etnaviv_obj, &priv->gem_list, gem_node) { 525 struct drm_gem_object *obj = &etnaviv_obj->base; 526 527 seq_puts(m, " "); 528 etnaviv_gem_describe(obj, m); 529 count++; 530 size += obj->size; 531 } 532 mutex_unlock(&priv->gem_lock); 533 534 seq_printf(m, "Total %d objects, %zu bytes\n", count, size); 535 } 536 #endif 537 538 static void etnaviv_gem_shmem_release(struct etnaviv_gem_object *etnaviv_obj) 539 { 540 vunmap(etnaviv_obj->vaddr); 541 put_pages(etnaviv_obj); 542 } 543 544 static const struct etnaviv_gem_ops etnaviv_gem_shmem_ops = { 545 .get_pages = etnaviv_gem_shmem_get_pages, 546 .release = etnaviv_gem_shmem_release, 547 .vmap = etnaviv_gem_vmap_impl, 548 .mmap = etnaviv_gem_mmap_obj, 549 }; 550 551 void etnaviv_gem_free_object(struct drm_gem_object *obj) 552 { 553 struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj); 554 struct etnaviv_vram_mapping *mapping, *tmp; 555 556 /* object should not be active */ 557 WARN_ON(is_active(etnaviv_obj)); 558 559 list_del(&etnaviv_obj->gem_node); 560 561 list_for_each_entry_safe(mapping, tmp, &etnaviv_obj->vram_list, 562 obj_node) { 563 struct etnaviv_iommu *mmu = mapping->mmu; 564 565 WARN_ON(mapping->use); 566 567 if (mmu) 568 etnaviv_iommu_unmap_gem(mmu, mapping); 569 570 list_del(&mapping->obj_node); 571 kfree(mapping); 572 } 573 574 drm_gem_free_mmap_offset(obj); 575 etnaviv_obj->ops->release(etnaviv_obj); 576 if (etnaviv_obj->resv == &etnaviv_obj->_resv) 577 reservation_object_fini(&etnaviv_obj->_resv); 578 drm_gem_object_release(obj); 579 580 kfree(etnaviv_obj); 581 } 582 583 int etnaviv_gem_obj_add(struct drm_device *dev, struct drm_gem_object *obj) 584 { 585 struct etnaviv_drm_private *priv = dev->dev_private; 586 struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj); 587 588 mutex_lock(&priv->gem_lock); 589 list_add_tail(&etnaviv_obj->gem_node, &priv->gem_list); 590 mutex_unlock(&priv->gem_lock); 591 592 return 0; 593 } 594 595 static int etnaviv_gem_new_impl(struct drm_device *dev, u32 size, u32 flags, 596 struct reservation_object *robj, const struct etnaviv_gem_ops *ops, 597 struct drm_gem_object **obj) 598 { 599 struct etnaviv_gem_object *etnaviv_obj; 600 unsigned sz = sizeof(*etnaviv_obj); 601 bool valid = true; 602 603 /* validate flags */ 604 switch (flags & ETNA_BO_CACHE_MASK) { 605 case ETNA_BO_UNCACHED: 606 case ETNA_BO_CACHED: 607 case ETNA_BO_WC: 608 break; 609 default: 610 valid = false; 611 } 612 613 if (!valid) { 614 dev_err(dev->dev, "invalid cache flag: %x\n", 615 (flags & ETNA_BO_CACHE_MASK)); 616 return -EINVAL; 617 } 618 619 etnaviv_obj = kzalloc(sz, GFP_KERNEL); 620 if (!etnaviv_obj) 621 return -ENOMEM; 622 623 etnaviv_obj->flags = flags; 624 etnaviv_obj->ops = ops; 625 if (robj) { 626 etnaviv_obj->resv = robj; 627 } else { 628 etnaviv_obj->resv = &etnaviv_obj->_resv; 629 reservation_object_init(&etnaviv_obj->_resv); 630 } 631 632 mutex_init(&etnaviv_obj->lock); 633 INIT_LIST_HEAD(&etnaviv_obj->vram_list); 634 635 *obj = &etnaviv_obj->base; 636 637 return 0; 638 } 639 640 static struct drm_gem_object *__etnaviv_gem_new(struct drm_device *dev, 641 u32 size, u32 flags) 642 { 643 struct drm_gem_object *obj = NULL; 644 int ret; 645 646 size = PAGE_ALIGN(size); 647 648 ret = etnaviv_gem_new_impl(dev, size, flags, NULL, 649 &etnaviv_gem_shmem_ops, &obj); 650 if (ret) 651 goto fail; 652 653 ret = drm_gem_object_init(dev, obj, size); 654 if (ret == 0) { 655 struct address_space *mapping; 656 657 /* 658 * Our buffers are kept pinned, so allocating them 659 * from the MOVABLE zone is a really bad idea, and 660 * conflicts with CMA. See coments above new_inode() 661 * why this is required _and_ expected if you're 662 * going to pin these pages. 663 */ 664 mapping = obj->filp->f_mapping; 665 mapping_set_gfp_mask(mapping, GFP_HIGHUSER | 666 __GFP_RETRY_MAYFAIL | __GFP_NOWARN); 667 } 668 669 if (ret) 670 goto fail; 671 672 return obj; 673 674 fail: 675 drm_gem_object_put_unlocked(obj); 676 return ERR_PTR(ret); 677 } 678 679 /* convenience method to construct a GEM buffer object, and userspace handle */ 680 int etnaviv_gem_new_handle(struct drm_device *dev, struct drm_file *file, 681 u32 size, u32 flags, u32 *handle) 682 { 683 struct drm_gem_object *obj; 684 int ret; 685 686 obj = __etnaviv_gem_new(dev, size, flags); 687 if (IS_ERR(obj)) 688 return PTR_ERR(obj); 689 690 ret = etnaviv_gem_obj_add(dev, obj); 691 if (ret < 0) { 692 drm_gem_object_put_unlocked(obj); 693 return ret; 694 } 695 696 ret = drm_gem_handle_create(file, obj, handle); 697 698 /* drop reference from allocate - handle holds it now */ 699 drm_gem_object_put_unlocked(obj); 700 701 return ret; 702 } 703 704 struct drm_gem_object *etnaviv_gem_new(struct drm_device *dev, 705 u32 size, u32 flags) 706 { 707 struct drm_gem_object *obj; 708 int ret; 709 710 obj = __etnaviv_gem_new(dev, size, flags); 711 if (IS_ERR(obj)) 712 return obj; 713 714 ret = etnaviv_gem_obj_add(dev, obj); 715 if (ret < 0) { 716 drm_gem_object_put_unlocked(obj); 717 return ERR_PTR(ret); 718 } 719 720 return obj; 721 } 722 723 int etnaviv_gem_new_private(struct drm_device *dev, size_t size, u32 flags, 724 struct reservation_object *robj, const struct etnaviv_gem_ops *ops, 725 struct etnaviv_gem_object **res) 726 { 727 struct drm_gem_object *obj; 728 int ret; 729 730 ret = etnaviv_gem_new_impl(dev, size, flags, robj, ops, &obj); 731 if (ret) 732 return ret; 733 734 drm_gem_private_object_init(dev, obj, size); 735 736 *res = to_etnaviv_bo(obj); 737 738 return 0; 739 } 740 741 struct get_pages_work { 742 struct work_struct work; 743 struct mm_struct *mm; 744 struct task_struct *task; 745 struct etnaviv_gem_object *etnaviv_obj; 746 }; 747 748 static struct page **etnaviv_gem_userptr_do_get_pages( 749 struct etnaviv_gem_object *etnaviv_obj, struct mm_struct *mm, struct task_struct *task) 750 { 751 int ret = 0, pinned, npages = etnaviv_obj->base.size >> PAGE_SHIFT; 752 struct page **pvec; 753 uintptr_t ptr; 754 unsigned int flags = 0; 755 756 pvec = kvmalloc_array(npages, sizeof(struct page *), GFP_KERNEL); 757 if (!pvec) 758 return ERR_PTR(-ENOMEM); 759 760 if (!etnaviv_obj->userptr.ro) 761 flags |= FOLL_WRITE; 762 763 pinned = 0; 764 ptr = etnaviv_obj->userptr.ptr; 765 766 down_read(&mm->mmap_sem); 767 while (pinned < npages) { 768 ret = get_user_pages_remote(task, mm, ptr, npages - pinned, 769 flags, pvec + pinned, NULL, NULL); 770 if (ret < 0) 771 break; 772 773 ptr += ret * PAGE_SIZE; 774 pinned += ret; 775 } 776 up_read(&mm->mmap_sem); 777 778 if (ret < 0) { 779 release_pages(pvec, pinned, 0); 780 kvfree(pvec); 781 return ERR_PTR(ret); 782 } 783 784 return pvec; 785 } 786 787 static void __etnaviv_gem_userptr_get_pages(struct work_struct *_work) 788 { 789 struct get_pages_work *work = container_of(_work, typeof(*work), work); 790 struct etnaviv_gem_object *etnaviv_obj = work->etnaviv_obj; 791 struct page **pvec; 792 793 pvec = etnaviv_gem_userptr_do_get_pages(etnaviv_obj, work->mm, work->task); 794 795 mutex_lock(&etnaviv_obj->lock); 796 if (IS_ERR(pvec)) { 797 etnaviv_obj->userptr.work = ERR_CAST(pvec); 798 } else { 799 etnaviv_obj->userptr.work = NULL; 800 etnaviv_obj->pages = pvec; 801 } 802 803 mutex_unlock(&etnaviv_obj->lock); 804 drm_gem_object_put_unlocked(&etnaviv_obj->base); 805 806 mmput(work->mm); 807 put_task_struct(work->task); 808 kfree(work); 809 } 810 811 static int etnaviv_gem_userptr_get_pages(struct etnaviv_gem_object *etnaviv_obj) 812 { 813 struct page **pvec = NULL; 814 struct get_pages_work *work; 815 struct mm_struct *mm; 816 int ret, pinned, npages = etnaviv_obj->base.size >> PAGE_SHIFT; 817 818 if (etnaviv_obj->userptr.work) { 819 if (IS_ERR(etnaviv_obj->userptr.work)) { 820 ret = PTR_ERR(etnaviv_obj->userptr.work); 821 etnaviv_obj->userptr.work = NULL; 822 } else { 823 ret = -EAGAIN; 824 } 825 return ret; 826 } 827 828 mm = get_task_mm(etnaviv_obj->userptr.task); 829 pinned = 0; 830 if (mm == current->mm) { 831 pvec = kvmalloc_array(npages, sizeof(struct page *), GFP_KERNEL); 832 if (!pvec) { 833 mmput(mm); 834 return -ENOMEM; 835 } 836 837 pinned = __get_user_pages_fast(etnaviv_obj->userptr.ptr, npages, 838 !etnaviv_obj->userptr.ro, pvec); 839 if (pinned < 0) { 840 kvfree(pvec); 841 mmput(mm); 842 return pinned; 843 } 844 845 if (pinned == npages) { 846 etnaviv_obj->pages = pvec; 847 mmput(mm); 848 return 0; 849 } 850 } 851 852 release_pages(pvec, pinned, 0); 853 kvfree(pvec); 854 855 work = kmalloc(sizeof(*work), GFP_KERNEL); 856 if (!work) { 857 mmput(mm); 858 return -ENOMEM; 859 } 860 861 get_task_struct(current); 862 drm_gem_object_get(&etnaviv_obj->base); 863 864 work->mm = mm; 865 work->task = current; 866 work->etnaviv_obj = etnaviv_obj; 867 868 etnaviv_obj->userptr.work = &work->work; 869 INIT_WORK(&work->work, __etnaviv_gem_userptr_get_pages); 870 871 etnaviv_queue_work(etnaviv_obj->base.dev, &work->work); 872 873 return -EAGAIN; 874 } 875 876 static void etnaviv_gem_userptr_release(struct etnaviv_gem_object *etnaviv_obj) 877 { 878 if (etnaviv_obj->sgt) { 879 etnaviv_gem_scatterlist_unmap(etnaviv_obj); 880 sg_free_table(etnaviv_obj->sgt); 881 kfree(etnaviv_obj->sgt); 882 } 883 if (etnaviv_obj->pages) { 884 int npages = etnaviv_obj->base.size >> PAGE_SHIFT; 885 886 release_pages(etnaviv_obj->pages, npages, 0); 887 kvfree(etnaviv_obj->pages); 888 } 889 put_task_struct(etnaviv_obj->userptr.task); 890 } 891 892 static int etnaviv_gem_userptr_mmap_obj(struct etnaviv_gem_object *etnaviv_obj, 893 struct vm_area_struct *vma) 894 { 895 return -EINVAL; 896 } 897 898 static const struct etnaviv_gem_ops etnaviv_gem_userptr_ops = { 899 .get_pages = etnaviv_gem_userptr_get_pages, 900 .release = etnaviv_gem_userptr_release, 901 .vmap = etnaviv_gem_vmap_impl, 902 .mmap = etnaviv_gem_userptr_mmap_obj, 903 }; 904 905 int etnaviv_gem_new_userptr(struct drm_device *dev, struct drm_file *file, 906 uintptr_t ptr, u32 size, u32 flags, u32 *handle) 907 { 908 struct etnaviv_gem_object *etnaviv_obj; 909 int ret; 910 911 ret = etnaviv_gem_new_private(dev, size, ETNA_BO_CACHED, NULL, 912 &etnaviv_gem_userptr_ops, &etnaviv_obj); 913 if (ret) 914 return ret; 915 916 etnaviv_obj->userptr.ptr = ptr; 917 etnaviv_obj->userptr.task = current; 918 etnaviv_obj->userptr.ro = !(flags & ETNA_USERPTR_WRITE); 919 get_task_struct(current); 920 921 ret = etnaviv_gem_obj_add(dev, &etnaviv_obj->base); 922 if (ret) 923 goto unreference; 924 925 ret = drm_gem_handle_create(file, &etnaviv_obj->base, handle); 926 unreference: 927 /* drop reference from allocate - handle holds it now */ 928 drm_gem_object_put_unlocked(&etnaviv_obj->base); 929 return ret; 930 } 931