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                 unsigned int npages = etnaviv_obj->base.size >> PAGE_SHIFT;
 104                 struct sg_table *sgt;
 105
 106                 sgt = drm_prime_pages_to_sg(dev, etnaviv_obj->pages, npages);
 107                 if (IS_ERR(sgt)) {
 108                         dev_err(dev->dev, "failed to allocate sgt: %ld\n",
 109                                 PTR_ERR(sgt));
 110                         return ERR_CAST(sgt);
 111                 }
 112
 113                 etnaviv_obj->sgt = sgt;
 114
 115                 etnaviv_gem_scatter_map(etnaviv_obj);
 116         }
 117
 118         return etnaviv_obj->pages;
 119 }
 120
 121 void etnaviv_gem_put_pages(struct etnaviv_gem_object *etnaviv_obj)
 122 {
 123         lockdep_assert_held(&etnaviv_obj->lock);
 124         /* when we start tracking the pin count, then do something here */
 125 }
 126
 127 static int etnaviv_gem_mmap_obj(struct etnaviv_gem_object *etnaviv_obj,
 128                 struct vm_area_struct *vma)
 129 {
 130         pgprot_t vm_page_prot;
 131
 132         vm_flags_set(vma, VM_PFNMAP | VM_DONTEXPAND | VM_DONTDUMP);
 133
 134         vm_page_prot = vm_get_page_prot(vma->vm_flags);
 135
 136         if (etnaviv_obj->flags & ETNA_BO_WC) {
 137                 vma->vm_page_prot = pgprot_writecombine(vm_page_prot);
 138         } else if (etnaviv_obj->flags & ETNA_BO_UNCACHED) {
 139                 vma->vm_page_prot = pgprot_noncached(vm_page_prot);
 140         } else {
 141                 /*
 142                  * Shunt off cached objs to shmem file so they have their own
 143                  * address_space (so unmap_mapping_range does what we want,
 144                  * in particular in the case of mmap'd dmabufs)
 145                  */
 146                 vma->vm_pgoff = 0;
 147                 vma_set_file(vma, etnaviv_obj->base.filp);
 148
 149                 vma->vm_page_prot = vm_page_prot;
 150         }
 151
 152         return 0;
 153 }
 154
 155 static int etnaviv_gem_mmap(struct drm_gem_object *obj, struct vm_area_struct *vma)
 156 {
 157         struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
 158
 159         return etnaviv_obj->ops->mmap(etnaviv_obj, vma);
 160 }
 161
 162 static vm_fault_t etnaviv_gem_fault(struct vm_fault *vmf)
 163 {
 164         struct vm_area_struct *vma = vmf->vma;
 165         struct drm_gem_object *obj = vma->vm_private_data;
 166         struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
 167         struct page **pages;
 168         unsigned long pfn;
 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         pfn = page_to_pfn(pages[pgoff]);
 193
 194         VERB("Inserting %p pfn %lx, pa %lx", (void *)vmf->address,
 195              pfn, pfn << PAGE_SHIFT);
 196
 197         return vmf_insert_pfn(vma, vmf->address, pfn);
 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                                 if (va && mapping->iova != va) {
 262                                         etnaviv_iommu_reap_mapping(mapping);
 263                                         mapping = NULL;
 264                                 } else {
 265                                         mapping->use += 1;
 266                                 }
 267                         else
 268                                 mapping = NULL;
 269                         mutex_unlock(&mmu_context->lock);
 270                         if (mapping)
 271                                 goto out;
 272                 } else {
 273                         mapping->use += 1;
 274                         goto out;
 275                 }
 276         }
 277
 278         pages = etnaviv_gem_get_pages(etnaviv_obj);
 279         if (IS_ERR(pages)) {
 280                 ret = PTR_ERR(pages);
 281                 goto out;
 282         }
 283
 284         /*
 285          * See if we have a reaped vram mapping we can re-use before
 286          * allocating a fresh mapping.
 287          */
 288         mapping = etnaviv_gem_get_vram_mapping(etnaviv_obj, NULL);
 289         if (!mapping) {
 290                 mapping = kzalloc(sizeof(*mapping), GFP_KERNEL);
 291                 if (!mapping) {
 292                         ret = -ENOMEM;
 293                         goto out;
 294                 }
 295
 296                 INIT_LIST_HEAD(&mapping->scan_node);
 297                 mapping->object = etnaviv_obj;
 298         } else {
 299                 list_del(&mapping->obj_node);
 300         }
 301
 302         mapping->use = 1;
 303
 304         ret = etnaviv_iommu_map_gem(mmu_context, etnaviv_obj,
 305                                     mmu_context->global->memory_base,
 306                                     mapping, va);
 307         if (ret < 0)
 308                 kfree(mapping);
 309         else
 310                 list_add_tail(&mapping->obj_node, &etnaviv_obj->vram_list);
 311
 312 out:
 313         mutex_unlock(&etnaviv_obj->lock);
 314
 315         if (ret)
 316                 return ERR_PTR(ret);
 317
 318         /* Take a reference on the object */
 319         drm_gem_object_get(obj);
 320         return mapping;
 321 }
 322
 323 void *etnaviv_gem_vmap(struct drm_gem_object *obj)
 324 {
 325         struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
 326
 327         if (etnaviv_obj->vaddr)
 328                 return etnaviv_obj->vaddr;
 329
 330         mutex_lock(&etnaviv_obj->lock);
 331         /*
 332          * Need to check again, as we might have raced with another thread
 333          * while waiting for the mutex.
 334          */
 335         if (!etnaviv_obj->vaddr)
 336                 etnaviv_obj->vaddr = etnaviv_obj->ops->vmap(etnaviv_obj);
 337         mutex_unlock(&etnaviv_obj->lock);
 338
 339         return etnaviv_obj->vaddr;
 340 }
 341
 342 static void *etnaviv_gem_vmap_impl(struct etnaviv_gem_object *obj)
 343 {
 344         struct page **pages;
 345
 346         lockdep_assert_held(&obj->lock);
 347
 348         pages = etnaviv_gem_get_pages(obj);
 349         if (IS_ERR(pages))
 350                 return NULL;
 351
 352         return vmap(pages, obj->base.size >> PAGE_SHIFT,
 353                         VM_MAP, pgprot_writecombine(PAGE_KERNEL));
 354 }
 355
 356 static inline enum dma_data_direction etnaviv_op_to_dma_dir(u32 op)
 357 {
 358         op &= ETNA_PREP_READ | ETNA_PREP_WRITE;
 359
 360         if (op == ETNA_PREP_READ)
 361                 return DMA_FROM_DEVICE;
 362         else if (op == ETNA_PREP_WRITE)
 363                 return DMA_TO_DEVICE;
 364         else
 365                 return DMA_BIDIRECTIONAL;
 366 }
 367
 368 int etnaviv_gem_cpu_prep(struct drm_gem_object *obj, u32 op,
 369                 struct drm_etnaviv_timespec *timeout)
 370 {
 371         struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
 372         struct drm_device *dev = obj->dev;
 373         bool write = !!(op & ETNA_PREP_WRITE);
 374         int ret;
 375
 376         if (!etnaviv_obj->sgt) {
 377                 void *ret;
 378
 379                 mutex_lock(&etnaviv_obj->lock);
 380                 ret = etnaviv_gem_get_pages(etnaviv_obj);
 381                 mutex_unlock(&etnaviv_obj->lock);
 382                 if (IS_ERR(ret))
 383                         return PTR_ERR(ret);
 384         }
 385
 386         if (op & ETNA_PREP_NOSYNC) {
 387                 if (!dma_resv_test_signaled(obj->resv,
 388                                             dma_resv_usage_rw(write)))
 389                         return -EBUSY;
 390         } else {
 391                 unsigned long remain = etnaviv_timeout_to_jiffies(timeout);
 392
 393                 ret = dma_resv_wait_timeout(obj->resv, dma_resv_usage_rw(write),
 394                                             true, remain);
 395                 if (ret <= 0)
 396                         return ret == 0 ? -ETIMEDOUT : ret;
 397         }
 398
 399         if (etnaviv_obj->flags & ETNA_BO_CACHED) {
 400                 dma_sync_sgtable_for_cpu(dev->dev, etnaviv_obj->sgt,
 401                                          etnaviv_op_to_dma_dir(op));
 402                 etnaviv_obj->last_cpu_prep_op = op;
 403         }
 404
 405         return 0;
 406 }
 407
 408 int etnaviv_gem_cpu_fini(struct drm_gem_object *obj)
 409 {
 410         struct drm_device *dev = obj->dev;
 411         struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
 412
 413         if (etnaviv_obj->flags & ETNA_BO_CACHED) {
 414                 /* fini without a prep is almost certainly a userspace error */
 415                 WARN_ON(etnaviv_obj->last_cpu_prep_op == 0);
 416                 dma_sync_sgtable_for_device(dev->dev, etnaviv_obj->sgt,
 417                         etnaviv_op_to_dma_dir(etnaviv_obj->last_cpu_prep_op));
 418                 etnaviv_obj->last_cpu_prep_op = 0;
 419         }
 420
 421         return 0;
 422 }
 423
 424 int etnaviv_gem_wait_bo(struct etnaviv_gpu *gpu, struct drm_gem_object *obj,
 425         struct drm_etnaviv_timespec *timeout)
 426 {
 427         struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
 428
 429         return etnaviv_gpu_wait_obj_inactive(gpu, etnaviv_obj, timeout);
 430 }
 431
 432 #ifdef CONFIG_DEBUG_FS
 433 static void etnaviv_gem_describe(struct drm_gem_object *obj, struct seq_file *m)
 434 {
 435         struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
 436         struct dma_resv *robj = obj->resv;
 437         unsigned long off = drm_vma_node_start(&obj->vma_node);
 438         int r;
 439
 440         seq_printf(m, "%08x: %c %2d (%2d) %08lx %p %zd\n",
 441                         etnaviv_obj->flags, is_active(etnaviv_obj) ? 'A' : 'I',
 442                         obj->name, kref_read(&obj->refcount),
 443                         off, etnaviv_obj->vaddr, obj->size);
 444
 445         r = dma_resv_lock(robj, NULL);
 446         if (r)
 447                 return;
 448
 449         dma_resv_describe(robj, m);
 450         dma_resv_unlock(robj);
 451 }
 452
 453 void etnaviv_gem_describe_objects(struct etnaviv_drm_private *priv,
 454         struct seq_file *m)
 455 {
 456         struct etnaviv_gem_object *etnaviv_obj;
 457         int count = 0;
 458         size_t size = 0;
 459
 460         mutex_lock(&priv->gem_lock);
 461         list_for_each_entry(etnaviv_obj, &priv->gem_list, gem_node) {
 462                 struct drm_gem_object *obj = &etnaviv_obj->base;
 463
 464                 seq_puts(m, "   ");
 465                 etnaviv_gem_describe(obj, m);
 466                 count++;
 467                 size += obj->size;
 468         }
 469         mutex_unlock(&priv->gem_lock);
 470
 471         seq_printf(m, "Total %d objects, %zu bytes\n", count, size);
 472 }
 473 #endif
 474
 475 static void etnaviv_gem_shmem_release(struct etnaviv_gem_object *etnaviv_obj)
 476 {
 477         vunmap(etnaviv_obj->vaddr);
 478         put_pages(etnaviv_obj);
 479 }
 480
 481 static const struct etnaviv_gem_ops etnaviv_gem_shmem_ops = {
 482         .get_pages = etnaviv_gem_shmem_get_pages,
 483         .release = etnaviv_gem_shmem_release,
 484         .vmap = etnaviv_gem_vmap_impl,
 485         .mmap = etnaviv_gem_mmap_obj,
 486 };
 487
 488 void etnaviv_gem_free_object(struct drm_gem_object *obj)
 489 {
 490         struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
 491         struct etnaviv_drm_private *priv = obj->dev->dev_private;
 492         struct etnaviv_vram_mapping *mapping, *tmp;
 493
 494         /* object should not be active */
 495         WARN_ON(is_active(etnaviv_obj));
 496
 497         mutex_lock(&priv->gem_lock);
 498         list_del(&etnaviv_obj->gem_node);
 499         mutex_unlock(&priv->gem_lock);
 500
 501         list_for_each_entry_safe(mapping, tmp, &etnaviv_obj->vram_list,
 502                                  obj_node) {
 503                 struct etnaviv_iommu_context *context = mapping->context;
 504
 505                 WARN_ON(mapping->use);
 506
 507                 if (context)
 508                         etnaviv_iommu_unmap_gem(context, mapping);
 509
 510                 list_del(&mapping->obj_node);
 511                 kfree(mapping);
 512         }
 513
 514         etnaviv_obj->ops->release(etnaviv_obj);
 515         drm_gem_object_release(obj);
 516
 517         kfree(etnaviv_obj);
 518 }
 519
 520 void etnaviv_gem_obj_add(struct drm_device *dev, struct drm_gem_object *obj)
 521 {
 522         struct etnaviv_drm_private *priv = dev->dev_private;
 523         struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
 524
 525         mutex_lock(&priv->gem_lock);
 526         list_add_tail(&etnaviv_obj->gem_node, &priv->gem_list);
 527         mutex_unlock(&priv->gem_lock);
 528 }
 529
 530 static const struct vm_operations_struct vm_ops = {
 531         .fault = etnaviv_gem_fault,
 532         .open = drm_gem_vm_open,
 533         .close = drm_gem_vm_close,
 534 };
 535
 536 static const struct drm_gem_object_funcs etnaviv_gem_object_funcs = {
 537         .free = etnaviv_gem_free_object,
 538         .pin = etnaviv_gem_prime_pin,
 539         .unpin = etnaviv_gem_prime_unpin,
 540         .get_sg_table = etnaviv_gem_prime_get_sg_table,
 541         .vmap = etnaviv_gem_prime_vmap,
 542         .mmap = etnaviv_gem_mmap,
 543         .vm_ops = &vm_ops,
 544 };
 545
 546 static int etnaviv_gem_new_impl(struct drm_device *dev, u32 flags,
 547         const struct etnaviv_gem_ops *ops, struct drm_gem_object **obj)
 548 {
 549         struct etnaviv_gem_object *etnaviv_obj;
 550         unsigned sz = sizeof(*etnaviv_obj);
 551         bool valid = true;
 552
 553         /* validate flags */
 554         switch (flags & ETNA_BO_CACHE_MASK) {
 555         case ETNA_BO_UNCACHED:
 556         case ETNA_BO_CACHED:
 557         case ETNA_BO_WC:
 558                 break;
 559         default:
 560                 valid = false;
 561         }
 562
 563         if (!valid) {
 564                 dev_err(dev->dev, "invalid cache flag: %x\n",
 565                         (flags & ETNA_BO_CACHE_MASK));
 566                 return -EINVAL;
 567         }
 568
 569         etnaviv_obj = kzalloc(sz, GFP_KERNEL);
 570         if (!etnaviv_obj)
 571                 return -ENOMEM;
 572
 573         etnaviv_obj->flags = flags;
 574         etnaviv_obj->ops = ops;
 575
 576         mutex_init(&etnaviv_obj->lock);
 577         INIT_LIST_HEAD(&etnaviv_obj->vram_list);
 578
 579         *obj = &etnaviv_obj->base;
 580         (*obj)->funcs = &etnaviv_gem_object_funcs;
 581
 582         return 0;
 583 }
 584
 585 /* convenience method to construct a GEM buffer object, and userspace handle */
 586 int etnaviv_gem_new_handle(struct drm_device *dev, struct drm_file *file,
 587         u32 size, u32 flags, u32 *handle)
 588 {
 589         struct etnaviv_drm_private *priv = dev->dev_private;
 590         struct drm_gem_object *obj = NULL;
 591         int ret;
 592
 593         size = PAGE_ALIGN(size);
 594
 595         ret = etnaviv_gem_new_impl(dev, flags, &etnaviv_gem_shmem_ops, &obj);
 596         if (ret)
 597                 goto fail;
 598
 599         lockdep_set_class(&to_etnaviv_bo(obj)->lock, &etnaviv_shm_lock_class);
 600
 601         ret = drm_gem_object_init(dev, obj, size);
 602         if (ret)
 603                 goto fail;
 604
 605         /*
 606          * Our buffers are kept pinned, so allocating them from the MOVABLE
 607          * zone is a really bad idea, and conflicts with CMA. See comments
 608          * above new_inode() why this is required _and_ expected if you're
 609          * going to pin these pages.
 610          */
 611         mapping_set_gfp_mask(obj->filp->f_mapping, priv->shm_gfp_mask);
 612
 613         etnaviv_gem_obj_add(dev, obj);
 614
 615         ret = drm_gem_handle_create(file, obj, handle);
 616
 617         /* drop reference from allocate - handle holds it now */
 618 fail:
 619         drm_gem_object_put(obj);
 620
 621         return ret;
 622 }
 623
 624 int etnaviv_gem_new_private(struct drm_device *dev, size_t size, u32 flags,
 625         const struct etnaviv_gem_ops *ops, struct etnaviv_gem_object **res)
 626 {
 627         struct drm_gem_object *obj;
 628         int ret;
 629
 630         ret = etnaviv_gem_new_impl(dev, flags, ops, &obj);
 631         if (ret)
 632                 return ret;
 633
 634         drm_gem_private_object_init(dev, obj, size);
 635
 636         *res = to_etnaviv_bo(obj);
 637
 638         return 0;
 639 }
 640
 641 static int etnaviv_gem_userptr_get_pages(struct etnaviv_gem_object *etnaviv_obj)
 642 {
 643         struct page **pvec = NULL;
 644         struct etnaviv_gem_userptr *userptr = &etnaviv_obj->userptr;
 645         int ret, pinned = 0, npages = etnaviv_obj->base.size >> PAGE_SHIFT;
 646         unsigned int gup_flags = FOLL_LONGTERM;
 647
 648         might_lock_read(&current->mm->mmap_lock);
 649
 650         if (userptr->mm != current->mm)
 651                 return -EPERM;
 652
 653         pvec = kvmalloc_array(npages, sizeof(struct page *), GFP_KERNEL);
 654         if (!pvec)
 655                 return -ENOMEM;
 656
 657         if (!userptr->ro)
 658                 gup_flags |= FOLL_WRITE;
 659
 660         do {
 661                 unsigned num_pages = npages - pinned;
 662                 uint64_t ptr = userptr->ptr + pinned * PAGE_SIZE;
 663                 struct page **pages = pvec + pinned;
 664
 665                 ret = pin_user_pages_fast(ptr, num_pages, gup_flags, pages);
 666                 if (ret < 0) {
 667                         unpin_user_pages(pvec, pinned);
 668                         kvfree(pvec);
 669                         return ret;
 670                 }
 671
 672                 pinned += ret;
 673
 674         } while (pinned < npages);
 675
 676         etnaviv_obj->pages = pvec;
 677
 678         return 0;
 679 }
 680
 681 static void etnaviv_gem_userptr_release(struct etnaviv_gem_object *etnaviv_obj)
 682 {
 683         if (etnaviv_obj->sgt) {
 684                 etnaviv_gem_scatterlist_unmap(etnaviv_obj);
 685                 sg_free_table(etnaviv_obj->sgt);
 686                 kfree(etnaviv_obj->sgt);
 687         }
 688         if (etnaviv_obj->pages) {
 689                 int npages = etnaviv_obj->base.size >> PAGE_SHIFT;
 690
 691                 unpin_user_pages(etnaviv_obj->pages, npages);
 692                 kvfree(etnaviv_obj->pages);
 693         }
 694 }
 695
 696 static int etnaviv_gem_userptr_mmap_obj(struct etnaviv_gem_object *etnaviv_obj,
 697                 struct vm_area_struct *vma)
 698 {
 699         return -EINVAL;
 700 }
 701
 702 static const struct etnaviv_gem_ops etnaviv_gem_userptr_ops = {
 703         .get_pages = etnaviv_gem_userptr_get_pages,
 704         .release = etnaviv_gem_userptr_release,
 705         .vmap = etnaviv_gem_vmap_impl,
 706         .mmap = etnaviv_gem_userptr_mmap_obj,
 707 };
 708
 709 int etnaviv_gem_new_userptr(struct drm_device *dev, struct drm_file *file,
 710         uintptr_t ptr, u32 size, u32 flags, u32 *handle)
 711 {
 712         struct etnaviv_gem_object *etnaviv_obj;
 713         int ret;
 714
 715         ret = etnaviv_gem_new_private(dev, size, ETNA_BO_CACHED,
 716                                       &etnaviv_gem_userptr_ops, &etnaviv_obj);
 717         if (ret)
 718                 return ret;
 719
 720         lockdep_set_class(&etnaviv_obj->lock, &etnaviv_userptr_lock_class);
 721
 722         etnaviv_obj->userptr.ptr = ptr;
 723         etnaviv_obj->userptr.mm = current->mm;
 724         etnaviv_obj->userptr.ro = !(flags & ETNA_USERPTR_WRITE);
 725
 726         etnaviv_gem_obj_add(dev, &etnaviv_obj->base);
 727
 728         ret = drm_gem_handle_create(file, &etnaviv_obj->base, handle);
 729
 730         /* drop reference from allocate - handle holds it now */
 731         drm_gem_object_put(&etnaviv_obj->base);
 732         return ret;
 733 }