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->context = etnaviv_iommu_context_get(mmu_context);
 298         mapping->use = 1;
 299
 300         ret = etnaviv_iommu_map_gem(mmu_context, etnaviv_obj,
 301                                     mmu_context->global->memory_base,
 302                                     mapping, va);
 303         if (ret < 0) {
 304                 etnaviv_iommu_context_put(mmu_context);
 305                 kfree(mapping);
 306         } else {
 307                 list_add_tail(&mapping->obj_node, &etnaviv_obj->vram_list);
 308         }
 309
 310 out:
 311         mutex_unlock(&etnaviv_obj->lock);
 312
 313         if (ret)
 314                 return ERR_PTR(ret);
 315
 316         /* Take a reference on the object */
 317         drm_gem_object_get(obj);
 318         return mapping;
 319 }
 320
 321 void *etnaviv_gem_vmap(struct drm_gem_object *obj)
 322 {
 323         struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
 324
 325         if (etnaviv_obj->vaddr)
 326                 return etnaviv_obj->vaddr;
 327
 328         mutex_lock(&etnaviv_obj->lock);
 329         /*
 330          * Need to check again, as we might have raced with another thread
 331          * while waiting for the mutex.
 332          */
 333         if (!etnaviv_obj->vaddr)
 334                 etnaviv_obj->vaddr = etnaviv_obj->ops->vmap(etnaviv_obj);
 335         mutex_unlock(&etnaviv_obj->lock);
 336
 337         return etnaviv_obj->vaddr;
 338 }
 339
 340 static void *etnaviv_gem_vmap_impl(struct etnaviv_gem_object *obj)
 341 {
 342         struct page **pages;
 343
 344         lockdep_assert_held(&obj->lock);
 345
 346         pages = etnaviv_gem_get_pages(obj);
 347         if (IS_ERR(pages))
 348                 return NULL;
 349
 350         return vmap(pages, obj->base.size >> PAGE_SHIFT,
 351                         VM_MAP, pgprot_writecombine(PAGE_KERNEL));
 352 }
 353
 354 static inline enum dma_data_direction etnaviv_op_to_dma_dir(u32 op)
 355 {
 356         if (op & ETNA_PREP_READ)
 357                 return DMA_FROM_DEVICE;
 358         else if (op & ETNA_PREP_WRITE)
 359                 return DMA_TO_DEVICE;
 360         else
 361                 return DMA_BIDIRECTIONAL;
 362 }
 363
 364 int etnaviv_gem_cpu_prep(struct drm_gem_object *obj, u32 op,
 365                 struct drm_etnaviv_timespec *timeout)
 366 {
 367         struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
 368         struct drm_device *dev = obj->dev;
 369         bool write = !!(op & ETNA_PREP_WRITE);
 370         int ret;
 371
 372         if (!etnaviv_obj->sgt) {
 373                 void *ret;
 374
 375                 mutex_lock(&etnaviv_obj->lock);
 376                 ret = etnaviv_gem_get_pages(etnaviv_obj);
 377                 mutex_unlock(&etnaviv_obj->lock);
 378                 if (IS_ERR(ret))
 379                         return PTR_ERR(ret);
 380         }
 381
 382         if (op & ETNA_PREP_NOSYNC) {
 383                 if (!dma_resv_test_signaled(obj->resv, write))
 384                         return -EBUSY;
 385         } else {
 386                 unsigned long remain = etnaviv_timeout_to_jiffies(timeout);
 387
 388                 ret = dma_resv_wait_timeout(obj->resv, write, true, remain);
 389                 if (ret <= 0)
 390                         return ret == 0 ? -ETIMEDOUT : ret;
 391         }
 392
 393         if (etnaviv_obj->flags & ETNA_BO_CACHED) {
 394                 dma_sync_sgtable_for_cpu(dev->dev, etnaviv_obj->sgt,
 395                                          etnaviv_op_to_dma_dir(op));
 396                 etnaviv_obj->last_cpu_prep_op = op;
 397         }
 398
 399         return 0;
 400 }
 401
 402 int etnaviv_gem_cpu_fini(struct drm_gem_object *obj)
 403 {
 404         struct drm_device *dev = obj->dev;
 405         struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
 406
 407         if (etnaviv_obj->flags & ETNA_BO_CACHED) {
 408                 /* fini without a prep is almost certainly a userspace error */
 409                 WARN_ON(etnaviv_obj->last_cpu_prep_op == 0);
 410                 dma_sync_sgtable_for_device(dev->dev, etnaviv_obj->sgt,
 411                         etnaviv_op_to_dma_dir(etnaviv_obj->last_cpu_prep_op));
 412                 etnaviv_obj->last_cpu_prep_op = 0;
 413         }
 414
 415         return 0;
 416 }
 417
 418 int etnaviv_gem_wait_bo(struct etnaviv_gpu *gpu, struct drm_gem_object *obj,
 419         struct drm_etnaviv_timespec *timeout)
 420 {
 421         struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
 422
 423         return etnaviv_gpu_wait_obj_inactive(gpu, etnaviv_obj, timeout);
 424 }
 425
 426 #ifdef CONFIG_DEBUG_FS
 427 static void etnaviv_gem_describe_fence(struct dma_fence *fence,
 428         const char *type, struct seq_file *m)
 429 {
 430         if (!test_bit(DMA_FENCE_FLAG_SIGNALED_BIT, &fence->flags))
 431                 seq_printf(m, "\t%9s: %s %s seq %llu\n",
 432                            type,
 433                            fence->ops->get_driver_name(fence),
 434                            fence->ops->get_timeline_name(fence),
 435                            fence->seqno);
 436 }
 437
 438 static void etnaviv_gem_describe(struct drm_gem_object *obj, struct seq_file *m)
 439 {
 440         struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
 441         struct dma_resv *robj = obj->resv;
 442         struct dma_resv_list *fobj;
 443         struct dma_fence *fence;
 444         unsigned long off = drm_vma_node_start(&obj->vma_node);
 445
 446         seq_printf(m, "%08x: %c %2d (%2d) %08lx %p %zd\n",
 447                         etnaviv_obj->flags, is_active(etnaviv_obj) ? 'A' : 'I',
 448                         obj->name, kref_read(&obj->refcount),
 449                         off, etnaviv_obj->vaddr, obj->size);
 450
 451         rcu_read_lock();
 452         fobj = dma_resv_shared_list(robj);
 453         if (fobj) {
 454                 unsigned int i, shared_count = fobj->shared_count;
 455
 456                 for (i = 0; i < shared_count; i++) {
 457                         fence = rcu_dereference(fobj->shared[i]);
 458                         etnaviv_gem_describe_fence(fence, "Shared", m);
 459                 }
 460         }
 461
 462         fence = dma_resv_excl_fence(robj);
 463         if (fence)
 464                 etnaviv_gem_describe_fence(fence, "Exclusive", m);
 465         rcu_read_unlock();
 466 }
 467
 468 void etnaviv_gem_describe_objects(struct etnaviv_drm_private *priv,
 469         struct seq_file *m)
 470 {
 471         struct etnaviv_gem_object *etnaviv_obj;
 472         int count = 0;
 473         size_t size = 0;
 474
 475         mutex_lock(&priv->gem_lock);
 476         list_for_each_entry(etnaviv_obj, &priv->gem_list, gem_node) {
 477                 struct drm_gem_object *obj = &etnaviv_obj->base;
 478
 479                 seq_puts(m, "   ");
 480                 etnaviv_gem_describe(obj, m);
 481                 count++;
 482                 size += obj->size;
 483         }
 484         mutex_unlock(&priv->gem_lock);
 485
 486         seq_printf(m, "Total %d objects, %zu bytes\n", count, size);
 487 }
 488 #endif
 489
 490 static void etnaviv_gem_shmem_release(struct etnaviv_gem_object *etnaviv_obj)
 491 {
 492         vunmap(etnaviv_obj->vaddr);
 493         put_pages(etnaviv_obj);
 494 }
 495
 496 static const struct etnaviv_gem_ops etnaviv_gem_shmem_ops = {
 497         .get_pages = etnaviv_gem_shmem_get_pages,
 498         .release = etnaviv_gem_shmem_release,
 499         .vmap = etnaviv_gem_vmap_impl,
 500         .mmap = etnaviv_gem_mmap_obj,
 501 };
 502
 503 void etnaviv_gem_free_object(struct drm_gem_object *obj)
 504 {
 505         struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
 506         struct etnaviv_drm_private *priv = obj->dev->dev_private;
 507         struct etnaviv_vram_mapping *mapping, *tmp;
 508
 509         /* object should not be active */
 510         WARN_ON(is_active(etnaviv_obj));
 511
 512         mutex_lock(&priv->gem_lock);
 513         list_del(&etnaviv_obj->gem_node);
 514         mutex_unlock(&priv->gem_lock);
 515
 516         list_for_each_entry_safe(mapping, tmp, &etnaviv_obj->vram_list,
 517                                  obj_node) {
 518                 struct etnaviv_iommu_context *context = mapping->context;
 519
 520                 WARN_ON(mapping->use);
 521
 522                 if (context) {
 523                         etnaviv_iommu_unmap_gem(context, mapping);
 524                         etnaviv_iommu_context_put(context);
 525                 }
 526
 527                 list_del(&mapping->obj_node);
 528                 kfree(mapping);
 529         }
 530
 531         drm_gem_free_mmap_offset(obj);
 532         etnaviv_obj->ops->release(etnaviv_obj);
 533         drm_gem_object_release(obj);
 534
 535         kfree(etnaviv_obj);
 536 }
 537
 538 void etnaviv_gem_obj_add(struct drm_device *dev, struct drm_gem_object *obj)
 539 {
 540         struct etnaviv_drm_private *priv = dev->dev_private;
 541         struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
 542
 543         mutex_lock(&priv->gem_lock);
 544         list_add_tail(&etnaviv_obj->gem_node, &priv->gem_list);
 545         mutex_unlock(&priv->gem_lock);
 546 }
 547
 548 static const struct vm_operations_struct vm_ops = {
 549         .fault = etnaviv_gem_fault,
 550         .open = drm_gem_vm_open,
 551         .close = drm_gem_vm_close,
 552 };
 553
 554 static const struct drm_gem_object_funcs etnaviv_gem_object_funcs = {
 555         .free = etnaviv_gem_free_object,
 556         .pin = etnaviv_gem_prime_pin,
 557         .unpin = etnaviv_gem_prime_unpin,
 558         .get_sg_table = etnaviv_gem_prime_get_sg_table,
 559         .vmap = etnaviv_gem_prime_vmap,
 560         .mmap = etnaviv_gem_mmap,
 561         .vm_ops = &vm_ops,
 562 };
 563
 564 static int etnaviv_gem_new_impl(struct drm_device *dev, u32 size, u32 flags,
 565         const struct etnaviv_gem_ops *ops, struct drm_gem_object **obj)
 566 {
 567         struct etnaviv_gem_object *etnaviv_obj;
 568         unsigned sz = sizeof(*etnaviv_obj);
 569         bool valid = true;
 570
 571         /* validate flags */
 572         switch (flags & ETNA_BO_CACHE_MASK) {
 573         case ETNA_BO_UNCACHED:
 574         case ETNA_BO_CACHED:
 575         case ETNA_BO_WC:
 576                 break;
 577         default:
 578                 valid = false;
 579         }
 580
 581         if (!valid) {
 582                 dev_err(dev->dev, "invalid cache flag: %x\n",
 583                         (flags & ETNA_BO_CACHE_MASK));
 584                 return -EINVAL;
 585         }
 586
 587         etnaviv_obj = kzalloc(sz, GFP_KERNEL);
 588         if (!etnaviv_obj)
 589                 return -ENOMEM;
 590
 591         etnaviv_obj->flags = flags;
 592         etnaviv_obj->ops = ops;
 593
 594         mutex_init(&etnaviv_obj->lock);
 595         INIT_LIST_HEAD(&etnaviv_obj->vram_list);
 596
 597         *obj = &etnaviv_obj->base;
 598         (*obj)->funcs = &etnaviv_gem_object_funcs;
 599
 600         return 0;
 601 }
 602
 603 /* convenience method to construct a GEM buffer object, and userspace handle */
 604 int etnaviv_gem_new_handle(struct drm_device *dev, struct drm_file *file,
 605         u32 size, u32 flags, u32 *handle)
 606 {
 607         struct etnaviv_drm_private *priv = dev->dev_private;
 608         struct drm_gem_object *obj = NULL;
 609         int ret;
 610
 611         size = PAGE_ALIGN(size);
 612
 613         ret = etnaviv_gem_new_impl(dev, size, flags,
 614                                    &etnaviv_gem_shmem_ops, &obj);
 615         if (ret)
 616                 goto fail;
 617
 618         lockdep_set_class(&to_etnaviv_bo(obj)->lock, &etnaviv_shm_lock_class);
 619
 620         ret = drm_gem_object_init(dev, obj, size);
 621         if (ret)
 622                 goto fail;
 623
 624         /*
 625          * Our buffers are kept pinned, so allocating them from the MOVABLE
 626          * zone is a really bad idea, and conflicts with CMA. See comments
 627          * above new_inode() why this is required _and_ expected if you're
 628          * going to pin these pages.
 629          */
 630         mapping_set_gfp_mask(obj->filp->f_mapping, priv->shm_gfp_mask);
 631
 632         etnaviv_gem_obj_add(dev, obj);
 633
 634         ret = drm_gem_handle_create(file, obj, handle);
 635
 636         /* drop reference from allocate - handle holds it now */
 637 fail:
 638         drm_gem_object_put(obj);
 639
 640         return ret;
 641 }
 642
 643 int etnaviv_gem_new_private(struct drm_device *dev, size_t size, u32 flags,
 644         const struct etnaviv_gem_ops *ops, struct etnaviv_gem_object **res)
 645 {
 646         struct drm_gem_object *obj;
 647         int ret;
 648
 649         ret = etnaviv_gem_new_impl(dev, size, flags, ops, &obj);
 650         if (ret)
 651                 return ret;
 652
 653         drm_gem_private_object_init(dev, obj, size);
 654
 655         *res = to_etnaviv_bo(obj);
 656
 657         return 0;
 658 }
 659
 660 static int etnaviv_gem_userptr_get_pages(struct etnaviv_gem_object *etnaviv_obj)
 661 {
 662         struct page **pvec = NULL;
 663         struct etnaviv_gem_userptr *userptr = &etnaviv_obj->userptr;
 664         int ret, pinned = 0, npages = etnaviv_obj->base.size >> PAGE_SHIFT;
 665
 666         might_lock_read(&current->mm->mmap_lock);
 667
 668         if (userptr->mm != current->mm)
 669                 return -EPERM;
 670
 671         pvec = kvmalloc_array(npages, sizeof(struct page *), GFP_KERNEL);
 672         if (!pvec)
 673                 return -ENOMEM;
 674
 675         do {
 676                 unsigned num_pages = npages - pinned;
 677                 uint64_t ptr = userptr->ptr + pinned * PAGE_SIZE;
 678                 struct page **pages = pvec + pinned;
 679
 680                 ret = pin_user_pages_fast(ptr, num_pages,
 681                                           FOLL_WRITE | FOLL_FORCE | FOLL_LONGTERM,
 682                                           pages);
 683                 if (ret < 0) {
 684                         unpin_user_pages(pvec, pinned);
 685                         kvfree(pvec);
 686                         return ret;
 687                 }
 688
 689                 pinned += ret;
 690
 691         } while (pinned < npages);
 692
 693         etnaviv_obj->pages = pvec;
 694
 695         return 0;
 696 }
 697
 698 static void etnaviv_gem_userptr_release(struct etnaviv_gem_object *etnaviv_obj)
 699 {
 700         if (etnaviv_obj->sgt) {
 701                 etnaviv_gem_scatterlist_unmap(etnaviv_obj);
 702                 sg_free_table(etnaviv_obj->sgt);
 703                 kfree(etnaviv_obj->sgt);
 704         }
 705         if (etnaviv_obj->pages) {
 706                 int npages = etnaviv_obj->base.size >> PAGE_SHIFT;
 707
 708                 unpin_user_pages(etnaviv_obj->pages, npages);
 709                 kvfree(etnaviv_obj->pages);
 710         }
 711 }
 712
 713 static int etnaviv_gem_userptr_mmap_obj(struct etnaviv_gem_object *etnaviv_obj,
 714                 struct vm_area_struct *vma)
 715 {
 716         return -EINVAL;
 717 }
 718
 719 static const struct etnaviv_gem_ops etnaviv_gem_userptr_ops = {
 720         .get_pages = etnaviv_gem_userptr_get_pages,
 721         .release = etnaviv_gem_userptr_release,
 722         .vmap = etnaviv_gem_vmap_impl,
 723         .mmap = etnaviv_gem_userptr_mmap_obj,
 724 };
 725
 726 int etnaviv_gem_new_userptr(struct drm_device *dev, struct drm_file *file,
 727         uintptr_t ptr, u32 size, u32 flags, u32 *handle)
 728 {
 729         struct etnaviv_gem_object *etnaviv_obj;
 730         int ret;
 731
 732         ret = etnaviv_gem_new_private(dev, size, ETNA_BO_CACHED,
 733                                       &etnaviv_gem_userptr_ops, &etnaviv_obj);
 734         if (ret)
 735                 return ret;
 736
 737         lockdep_set_class(&etnaviv_obj->lock, &etnaviv_userptr_lock_class);
 738
 739         etnaviv_obj->userptr.ptr = ptr;
 740         etnaviv_obj->userptr.mm = current->mm;
 741         etnaviv_obj->userptr.ro = !(flags & ETNA_USERPTR_WRITE);
 742
 743         etnaviv_gem_obj_add(dev, &etnaviv_obj->base);
 744
 745         ret = drm_gem_handle_create(file, &etnaviv_obj->base, handle);
 746
 747         /* drop reference from allocate - handle holds it now */
 748         drm_gem_object_put(&etnaviv_obj->base);
 749         return ret;
 750 }