drivers/gpu/drm/etnaviv/etnaviv_gem.c

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