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 <linux/spinlock.h>
   7 #include <linux/shmem_fs.h>
   8 #include <linux/sched/mm.h>
   9 #include <linux/sched/task.h>
  10
  11 #include "etnaviv_drv.h"
  12 #include "etnaviv_gem.h"
  13 #include "etnaviv_gpu.h"
  14 #include "etnaviv_mmu.h"
  15
  16 static struct lock_class_key etnaviv_shm_lock_class;
  17 static struct lock_class_key etnaviv_userptr_lock_class;
  18
  19 static void etnaviv_gem_scatter_map(struct etnaviv_gem_object *etnaviv_obj)
  20 {
  21         struct drm_device *dev = etnaviv_obj->base.dev;
  22         struct sg_table *sgt = etnaviv_obj->sgt;
  23
  24         /*
  25          * For non-cached buffers, ensure the new pages are clean
  26          * because display controller, GPU, etc. are not coherent.
  27          */
  28         if (etnaviv_obj->flags & ETNA_BO_CACHE_MASK)
  29                 dma_map_sg(dev->dev, sgt->sgl, sgt->nents, DMA_BIDIRECTIONAL);
  30 }
  31
  32 static void etnaviv_gem_scatterlist_unmap(struct etnaviv_gem_object *etnaviv_obj)
  33 {
  34         struct drm_device *dev = etnaviv_obj->base.dev;
  35         struct sg_table *sgt = etnaviv_obj->sgt;
  36
  37         /*
  38          * For non-cached buffers, ensure the new pages are clean
  39          * because display controller, GPU, etc. are not coherent:
  40          *
  41          * WARNING: The DMA API does not support concurrent CPU
  42          * and device access to the memory area.  With BIDIRECTIONAL,
  43          * we will clean the cache lines which overlap the region,
  44          * and invalidate all cache lines (partially) contained in
  45          * the region.
  46          *
  47          * If you have dirty data in the overlapping cache lines,
  48          * that will corrupt the GPU-written data.  If you have
  49          * written into the remainder of the region, this can
  50          * discard those writes.
  51          */
  52         if (etnaviv_obj->flags & ETNA_BO_CACHE_MASK)
  53                 dma_unmap_sg(dev->dev, sgt->sgl, sgt->nents, DMA_BIDIRECTIONAL);
  54 }
  55
  56 /* called with etnaviv_obj->lock held */
  57 static int etnaviv_gem_shmem_get_pages(struct etnaviv_gem_object *etnaviv_obj)
  58 {
  59         struct drm_device *dev = etnaviv_obj->base.dev;
  60         struct page **p = drm_gem_get_pages(&etnaviv_obj->base);
  61
  62         if (IS_ERR(p)) {
  63                 dev_dbg(dev->dev, "could not get pages: %ld\n", PTR_ERR(p));
  64                 return PTR_ERR(p);
  65         }
  66
  67         etnaviv_obj->pages = p;
  68
  69         return 0;
  70 }
  71
  72 static void put_pages(struct etnaviv_gem_object *etnaviv_obj)
  73 {
  74         if (etnaviv_obj->sgt) {
  75                 etnaviv_gem_scatterlist_unmap(etnaviv_obj);
  76                 sg_free_table(etnaviv_obj->sgt);
  77                 kfree(etnaviv_obj->sgt);
  78                 etnaviv_obj->sgt = NULL;
  79         }
  80         if (etnaviv_obj->pages) {
  81                 drm_gem_put_pages(&etnaviv_obj->base, etnaviv_obj->pages,
  82                                   true, false);
  83
  84                 etnaviv_obj->pages = NULL;
  85         }
  86 }
  87
  88 struct page **etnaviv_gem_get_pages(struct etnaviv_gem_object *etnaviv_obj)
  89 {
  90         int ret;
  91
  92         lockdep_assert_held(&etnaviv_obj->lock);
  93
  94         if (!etnaviv_obj->pages) {
  95                 ret = etnaviv_obj->ops->get_pages(etnaviv_obj);
  96                 if (ret < 0)
  97                         return ERR_PTR(ret);
  98         }
  99
 100         if (!etnaviv_obj->sgt) {
 101                 struct drm_device *dev = etnaviv_obj->base.dev;
 102                 int npages = etnaviv_obj->base.size >> PAGE_SHIFT;
 103                 struct sg_table *sgt;
 104
 105                 sgt = drm_prime_pages_to_sg(etnaviv_obj->pages, npages);
 106                 if (IS_ERR(sgt)) {
 107                         dev_err(dev->dev, "failed to allocate sgt: %ld\n",
 108                                 PTR_ERR(sgt));
 109                         return ERR_CAST(sgt);
 110                 }
 111
 112                 etnaviv_obj->sgt = sgt;
 113
 114                 etnaviv_gem_scatter_map(etnaviv_obj);
 115         }
 116
 117         return etnaviv_obj->pages;
 118 }
 119
 120 void etnaviv_gem_put_pages(struct etnaviv_gem_object *etnaviv_obj)
 121 {
 122         lockdep_assert_held(&etnaviv_obj->lock);
 123         /* when we start tracking the pin count, then do something here */
 124 }
 125
 126 static int etnaviv_gem_mmap_obj(struct etnaviv_gem_object *etnaviv_obj,
 127                 struct vm_area_struct *vma)
 128 {
 129         pgprot_t vm_page_prot;
 130
 131         vma->vm_flags &= ~VM_PFNMAP;
 132         vma->vm_flags |= VM_MIXEDMAP;
 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                 fput(vma->vm_file);
 147                 get_file(etnaviv_obj->base.filp);
 148                 vma->vm_pgoff = 0;
 149                 vma->vm_file  = etnaviv_obj->base.filp;
 150
 151                 vma->vm_page_prot = vm_page_prot;
 152         }
 153
 154         return 0;
 155 }
 156
 157 int etnaviv_gem_mmap(struct file *filp, struct vm_area_struct *vma)
 158 {
 159         struct etnaviv_gem_object *obj;
 160         int ret;
 161
 162         ret = drm_gem_mmap(filp, vma);
 163         if (ret) {
 164                 DBG("mmap failed: %d", ret);
 165                 return ret;
 166         }
 167
 168         obj = to_etnaviv_bo(vma->vm_private_data);
 169         return obj->ops->mmap(obj, vma);
 170 }
 171
 172 int etnaviv_gem_fault(struct vm_fault *vmf)
 173 {
 174         struct vm_area_struct *vma = vmf->vma;
 175         struct drm_gem_object *obj = vma->vm_private_data;
 176         struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
 177         struct page **pages, *page;
 178         pgoff_t pgoff;
 179         int ret;
 180
 181         /*
 182          * Make sure we don't parallel update on a fault, nor move or remove
 183          * something from beneath our feet.  Note that vm_insert_page() is
 184          * specifically coded to take care of this, so we don't have to.
 185          */
 186         ret = mutex_lock_interruptible(&etnaviv_obj->lock);
 187         if (ret)
 188                 goto out;
 189
 190         /* make sure we have pages attached now */
 191         pages = etnaviv_gem_get_pages(etnaviv_obj);
 192         mutex_unlock(&etnaviv_obj->lock);
 193
 194         if (IS_ERR(pages)) {
 195                 ret = PTR_ERR(pages);
 196                 goto out;
 197         }
 198
 199         /* We don't use vmf->pgoff since that has the fake offset: */
 200         pgoff = (vmf->address - vma->vm_start) >> PAGE_SHIFT;
 201
 202         page = pages[pgoff];
 203
 204         VERB("Inserting %p pfn %lx, pa %lx", (void *)vmf->address,
 205              page_to_pfn(page), page_to_pfn(page) << PAGE_SHIFT);
 206
 207         ret = vm_insert_page(vma, vmf->address, page);
 208
 209 out:
 210         switch (ret) {
 211         case -EAGAIN:
 212         case 0:
 213         case -ERESTARTSYS:
 214         case -EINTR:
 215         case -EBUSY:
 216                 /*
 217                  * EBUSY is ok: this just means that another thread
 218                  * already did the job.
 219                  */
 220                 return VM_FAULT_NOPAGE;
 221         case -ENOMEM:
 222                 return VM_FAULT_OOM;
 223         default:
 224                 return VM_FAULT_SIGBUS;
 225         }
 226 }
 227
 228 int etnaviv_gem_mmap_offset(struct drm_gem_object *obj, u64 *offset)
 229 {
 230         int ret;
 231
 232         /* Make it mmapable */
 233         ret = drm_gem_create_mmap_offset(obj);
 234         if (ret)
 235                 dev_err(obj->dev->dev, "could not allocate mmap offset\n");
 236         else
 237                 *offset = drm_vma_node_offset_addr(&obj->vma_node);
 238
 239         return ret;
 240 }
 241
 242 static struct etnaviv_vram_mapping *
 243 etnaviv_gem_get_vram_mapping(struct etnaviv_gem_object *obj,
 244                              struct etnaviv_iommu *mmu)
 245 {
 246         struct etnaviv_vram_mapping *mapping;
 247
 248         list_for_each_entry(mapping, &obj->vram_list, obj_node) {
 249                 if (mapping->mmu == mmu)
 250                         return mapping;
 251         }
 252
 253         return NULL;
 254 }
 255
 256 void etnaviv_gem_mapping_reference(struct etnaviv_vram_mapping *mapping)
 257 {
 258         struct etnaviv_gem_object *etnaviv_obj = mapping->object;
 259
 260         drm_gem_object_get(&etnaviv_obj->base);
 261
 262         mutex_lock(&etnaviv_obj->lock);
 263         WARN_ON(mapping->use == 0);
 264         mapping->use += 1;
 265         mutex_unlock(&etnaviv_obj->lock);
 266 }
 267
 268 void etnaviv_gem_mapping_unreference(struct etnaviv_vram_mapping *mapping)
 269 {
 270         struct etnaviv_gem_object *etnaviv_obj = mapping->object;
 271
 272         mutex_lock(&etnaviv_obj->lock);
 273         WARN_ON(mapping->use == 0);
 274         mapping->use -= 1;
 275         mutex_unlock(&etnaviv_obj->lock);
 276
 277         drm_gem_object_put_unlocked(&etnaviv_obj->base);
 278 }
 279
 280 struct etnaviv_vram_mapping *etnaviv_gem_mapping_get(
 281         struct drm_gem_object *obj, struct etnaviv_gpu *gpu)
 282 {
 283         struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
 284         struct etnaviv_vram_mapping *mapping;
 285         struct page **pages;
 286         int ret = 0;
 287
 288         mutex_lock(&etnaviv_obj->lock);
 289         mapping = etnaviv_gem_get_vram_mapping(etnaviv_obj, gpu->mmu);
 290         if (mapping) {
 291                 /*
 292                  * Holding the object lock prevents the use count changing
 293                  * beneath us.  If the use count is zero, the MMU might be
 294                  * reaping this object, so take the lock and re-check that
 295                  * the MMU owns this mapping to close this race.
 296                  */
 297                 if (mapping->use == 0) {
 298                         mutex_lock(&gpu->mmu->lock);
 299                         if (mapping->mmu == gpu->mmu)
 300                                 mapping->use += 1;
 301                         else
 302                                 mapping = NULL;
 303                         mutex_unlock(&gpu->mmu->lock);
 304                         if (mapping)
 305                                 goto out;
 306                 } else {
 307                         mapping->use += 1;
 308                         goto out;
 309                 }
 310         }
 311
 312         pages = etnaviv_gem_get_pages(etnaviv_obj);
 313         if (IS_ERR(pages)) {
 314                 ret = PTR_ERR(pages);
 315                 goto out;
 316         }
 317
 318         /*
 319          * See if we have a reaped vram mapping we can re-use before
 320          * allocating a fresh mapping.
 321          */
 322         mapping = etnaviv_gem_get_vram_mapping(etnaviv_obj, NULL);
 323         if (!mapping) {
 324                 mapping = kzalloc(sizeof(*mapping), GFP_KERNEL);
 325                 if (!mapping) {
 326                         ret = -ENOMEM;
 327                         goto out;
 328                 }
 329
 330                 INIT_LIST_HEAD(&mapping->scan_node);
 331                 mapping->object = etnaviv_obj;
 332         } else {
 333                 list_del(&mapping->obj_node);
 334         }
 335
 336         mapping->mmu = gpu->mmu;
 337         mapping->use = 1;
 338
 339         ret = etnaviv_iommu_map_gem(gpu->mmu, etnaviv_obj, gpu->memory_base,
 340                                     mapping);
 341         if (ret < 0)
 342                 kfree(mapping);
 343         else
 344                 list_add_tail(&mapping->obj_node, &etnaviv_obj->vram_list);
 345
 346 out:
 347         mutex_unlock(&etnaviv_obj->lock);
 348
 349         if (ret)
 350                 return ERR_PTR(ret);
 351
 352         /* Take a reference on the object */
 353         drm_gem_object_get(obj);
 354         return mapping;
 355 }
 356
 357 void *etnaviv_gem_vmap(struct drm_gem_object *obj)
 358 {
 359         struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
 360
 361         if (etnaviv_obj->vaddr)
 362                 return etnaviv_obj->vaddr;
 363
 364         mutex_lock(&etnaviv_obj->lock);
 365         /*
 366          * Need to check again, as we might have raced with another thread
 367          * while waiting for the mutex.
 368          */
 369         if (!etnaviv_obj->vaddr)
 370                 etnaviv_obj->vaddr = etnaviv_obj->ops->vmap(etnaviv_obj);
 371         mutex_unlock(&etnaviv_obj->lock);
 372
 373         return etnaviv_obj->vaddr;
 374 }
 375
 376 static void *etnaviv_gem_vmap_impl(struct etnaviv_gem_object *obj)
 377 {
 378         struct page **pages;
 379
 380         lockdep_assert_held(&obj->lock);
 381
 382         pages = etnaviv_gem_get_pages(obj);
 383         if (IS_ERR(pages))
 384                 return NULL;
 385
 386         return vmap(pages, obj->base.size >> PAGE_SHIFT,
 387                         VM_MAP, pgprot_writecombine(PAGE_KERNEL));
 388 }
 389
 390 static inline enum dma_data_direction etnaviv_op_to_dma_dir(u32 op)
 391 {
 392         if (op & ETNA_PREP_READ)
 393                 return DMA_FROM_DEVICE;
 394         else if (op & ETNA_PREP_WRITE)
 395                 return DMA_TO_DEVICE;
 396         else
 397                 return DMA_BIDIRECTIONAL;
 398 }
 399
 400 int etnaviv_gem_cpu_prep(struct drm_gem_object *obj, u32 op,
 401                 struct timespec *timeout)
 402 {
 403         struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
 404         struct drm_device *dev = obj->dev;
 405         bool write = !!(op & ETNA_PREP_WRITE);
 406         int ret;
 407
 408         if (!etnaviv_obj->sgt) {
 409                 void *ret;
 410
 411                 mutex_lock(&etnaviv_obj->lock);
 412                 ret = etnaviv_gem_get_pages(etnaviv_obj);
 413                 mutex_unlock(&etnaviv_obj->lock);
 414                 if (IS_ERR(ret))
 415                         return PTR_ERR(ret);
 416         }
 417
 418         if (op & ETNA_PREP_NOSYNC) {
 419                 if (!reservation_object_test_signaled_rcu(etnaviv_obj->resv,
 420                                                           write))
 421                         return -EBUSY;
 422         } else {
 423                 unsigned long remain = etnaviv_timeout_to_jiffies(timeout);
 424
 425                 ret = reservation_object_wait_timeout_rcu(etnaviv_obj->resv,
 426                                                           write, true, remain);
 427                 if (ret <= 0)
 428                         return ret == 0 ? -ETIMEDOUT : ret;
 429         }
 430
 431         if (etnaviv_obj->flags & ETNA_BO_CACHED) {
 432                 dma_sync_sg_for_cpu(dev->dev, etnaviv_obj->sgt->sgl,
 433                                     etnaviv_obj->sgt->nents,
 434                                     etnaviv_op_to_dma_dir(op));
 435                 etnaviv_obj->last_cpu_prep_op = op;
 436         }
 437
 438         return 0;
 439 }
 440
 441 int etnaviv_gem_cpu_fini(struct drm_gem_object *obj)
 442 {
 443         struct drm_device *dev = obj->dev;
 444         struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
 445
 446         if (etnaviv_obj->flags & ETNA_BO_CACHED) {
 447                 /* fini without a prep is almost certainly a userspace error */
 448                 WARN_ON(etnaviv_obj->last_cpu_prep_op == 0);
 449                 dma_sync_sg_for_device(dev->dev, etnaviv_obj->sgt->sgl,
 450                         etnaviv_obj->sgt->nents,
 451                         etnaviv_op_to_dma_dir(etnaviv_obj->last_cpu_prep_op));
 452                 etnaviv_obj->last_cpu_prep_op = 0;
 453         }
 454
 455         return 0;
 456 }
 457
 458 int etnaviv_gem_wait_bo(struct etnaviv_gpu *gpu, struct drm_gem_object *obj,
 459         struct timespec *timeout)
 460 {
 461         struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
 462
 463         return etnaviv_gpu_wait_obj_inactive(gpu, etnaviv_obj, timeout);
 464 }
 465
 466 #ifdef CONFIG_DEBUG_FS
 467 static void etnaviv_gem_describe_fence(struct dma_fence *fence,
 468         const char *type, struct seq_file *m)
 469 {
 470         if (!test_bit(DMA_FENCE_FLAG_SIGNALED_BIT, &fence->flags))
 471                 seq_printf(m, "\t%9s: %s %s seq %u\n",
 472                            type,
 473                            fence->ops->get_driver_name(fence),
 474                            fence->ops->get_timeline_name(fence),
 475                            fence->seqno);
 476 }
 477
 478 static void etnaviv_gem_describe(struct drm_gem_object *obj, struct seq_file *m)
 479 {
 480         struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
 481         struct reservation_object *robj = etnaviv_obj->resv;
 482         struct reservation_object_list *fobj;
 483         struct dma_fence *fence;
 484         unsigned long off = drm_vma_node_start(&obj->vma_node);
 485
 486         seq_printf(m, "%08x: %c %2d (%2d) %08lx %p %zd\n",
 487                         etnaviv_obj->flags, is_active(etnaviv_obj) ? 'A' : 'I',
 488                         obj->name, kref_read(&obj->refcount),
 489                         off, etnaviv_obj->vaddr, obj->size);
 490
 491         rcu_read_lock();
 492         fobj = rcu_dereference(robj->fence);
 493         if (fobj) {
 494                 unsigned int i, shared_count = fobj->shared_count;
 495
 496                 for (i = 0; i < shared_count; i++) {
 497                         fence = rcu_dereference(fobj->shared[i]);
 498                         etnaviv_gem_describe_fence(fence, "Shared", m);
 499                 }
 500         }
 501
 502         fence = rcu_dereference(robj->fence_excl);
 503         if (fence)
 504                 etnaviv_gem_describe_fence(fence, "Exclusive", m);
 505         rcu_read_unlock();
 506 }
 507
 508 void etnaviv_gem_describe_objects(struct etnaviv_drm_private *priv,
 509         struct seq_file *m)
 510 {
 511         struct etnaviv_gem_object *etnaviv_obj;
 512         int count = 0;
 513         size_t size = 0;
 514
 515         mutex_lock(&priv->gem_lock);
 516         list_for_each_entry(etnaviv_obj, &priv->gem_list, gem_node) {
 517                 struct drm_gem_object *obj = &etnaviv_obj->base;
 518
 519                 seq_puts(m, "   ");
 520                 etnaviv_gem_describe(obj, m);
 521                 count++;
 522                 size += obj->size;
 523         }
 524         mutex_unlock(&priv->gem_lock);
 525
 526         seq_printf(m, "Total %d objects, %zu bytes\n", count, size);
 527 }
 528 #endif
 529
 530 static void etnaviv_gem_shmem_release(struct etnaviv_gem_object *etnaviv_obj)
 531 {
 532         vunmap(etnaviv_obj->vaddr);
 533         put_pages(etnaviv_obj);
 534 }
 535
 536 static const struct etnaviv_gem_ops etnaviv_gem_shmem_ops = {
 537         .get_pages = etnaviv_gem_shmem_get_pages,
 538         .release = etnaviv_gem_shmem_release,
 539         .vmap = etnaviv_gem_vmap_impl,
 540         .mmap = etnaviv_gem_mmap_obj,
 541 };
 542
 543 void etnaviv_gem_free_object(struct drm_gem_object *obj)
 544 {
 545         struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
 546         struct etnaviv_drm_private *priv = obj->dev->dev_private;
 547         struct etnaviv_vram_mapping *mapping, *tmp;
 548
 549         /* object should not be active */
 550         WARN_ON(is_active(etnaviv_obj));
 551
 552         mutex_lock(&priv->gem_lock);
 553         list_del(&etnaviv_obj->gem_node);
 554         mutex_unlock(&priv->gem_lock);
 555
 556         list_for_each_entry_safe(mapping, tmp, &etnaviv_obj->vram_list,
 557                                  obj_node) {
 558                 struct etnaviv_iommu *mmu = mapping->mmu;
 559
 560                 WARN_ON(mapping->use);
 561
 562                 if (mmu)
 563                         etnaviv_iommu_unmap_gem(mmu, mapping);
 564
 565                 list_del(&mapping->obj_node);
 566                 kfree(mapping);
 567         }
 568
 569         drm_gem_free_mmap_offset(obj);
 570         etnaviv_obj->ops->release(etnaviv_obj);
 571         if (etnaviv_obj->resv == &etnaviv_obj->_resv)
 572                 reservation_object_fini(&etnaviv_obj->_resv);
 573         drm_gem_object_release(obj);
 574
 575         kfree(etnaviv_obj);
 576 }
 577
 578 void etnaviv_gem_obj_add(struct drm_device *dev, struct drm_gem_object *obj)
 579 {
 580         struct etnaviv_drm_private *priv = dev->dev_private;
 581         struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
 582
 583         mutex_lock(&priv->gem_lock);
 584         list_add_tail(&etnaviv_obj->gem_node, &priv->gem_list);
 585         mutex_unlock(&priv->gem_lock);
 586 }
 587
 588 static int etnaviv_gem_new_impl(struct drm_device *dev, u32 size, u32 flags,
 589         struct reservation_object *robj, const struct etnaviv_gem_ops *ops,
 590         struct drm_gem_object **obj)
 591 {
 592         struct etnaviv_gem_object *etnaviv_obj;
 593         unsigned sz = sizeof(*etnaviv_obj);
 594         bool valid = true;
 595
 596         /* validate flags */
 597         switch (flags & ETNA_BO_CACHE_MASK) {
 598         case ETNA_BO_UNCACHED:
 599         case ETNA_BO_CACHED:
 600         case ETNA_BO_WC:
 601                 break;
 602         default:
 603                 valid = false;
 604         }
 605
 606         if (!valid) {
 607                 dev_err(dev->dev, "invalid cache flag: %x\n",
 608                         (flags & ETNA_BO_CACHE_MASK));
 609                 return -EINVAL;
 610         }
 611
 612         etnaviv_obj = kzalloc(sz, GFP_KERNEL);
 613         if (!etnaviv_obj)
 614                 return -ENOMEM;
 615
 616         etnaviv_obj->flags = flags;
 617         etnaviv_obj->ops = ops;
 618         if (robj) {
 619                 etnaviv_obj->resv = robj;
 620         } else {
 621                 etnaviv_obj->resv = &etnaviv_obj->_resv;
 622                 reservation_object_init(&etnaviv_obj->_resv);
 623         }
 624
 625         mutex_init(&etnaviv_obj->lock);
 626         INIT_LIST_HEAD(&etnaviv_obj->vram_list);
 627
 628         *obj = &etnaviv_obj->base;
 629
 630         return 0;
 631 }
 632
 633 /* convenience method to construct a GEM buffer object, and userspace handle */
 634 int etnaviv_gem_new_handle(struct drm_device *dev, struct drm_file *file,
 635         u32 size, u32 flags, u32 *handle)
 636 {
 637         struct drm_gem_object *obj = NULL;
 638         int ret;
 639
 640         size = PAGE_ALIGN(size);
 641
 642         ret = etnaviv_gem_new_impl(dev, size, flags, NULL,
 643                                    &etnaviv_gem_shmem_ops, &obj);
 644         if (ret)
 645                 goto fail;
 646
 647         lockdep_set_class(&to_etnaviv_bo(obj)->lock, &etnaviv_shm_lock_class);
 648
 649         ret = drm_gem_object_init(dev, obj, size);
 650         if (ret == 0) {
 651                 struct address_space *mapping;
 652
 653                 /*
 654                  * Our buffers are kept pinned, so allocating them
 655                  * from the MOVABLE zone is a really bad idea, and
 656                  * conflicts with CMA. See comments above new_inode()
 657                  * why this is required _and_ expected if you're
 658                  * going to pin these pages.
 659                  */
 660                 mapping = obj->filp->f_mapping;
 661                 mapping_set_gfp_mask(mapping, GFP_HIGHUSER |
 662                                      __GFP_RETRY_MAYFAIL | __GFP_NOWARN);
 663         }
 664
 665         if (ret)
 666                 goto fail;
 667
 668         etnaviv_gem_obj_add(dev, obj);
 669
 670         ret = drm_gem_handle_create(file, obj, handle);
 671
 672         /* drop reference from allocate - handle holds it now */
 673 fail:
 674         drm_gem_object_put_unlocked(obj);
 675
 676         return ret;
 677 }
 678
 679 int etnaviv_gem_new_private(struct drm_device *dev, size_t size, u32 flags,
 680         struct reservation_object *robj, const struct etnaviv_gem_ops *ops,
 681         struct etnaviv_gem_object **res)
 682 {
 683         struct drm_gem_object *obj;
 684         int ret;
 685
 686         ret = etnaviv_gem_new_impl(dev, size, flags, robj, ops, &obj);
 687         if (ret)
 688                 return ret;
 689
 690         drm_gem_private_object_init(dev, obj, size);
 691
 692         *res = to_etnaviv_bo(obj);
 693
 694         return 0;
 695 }
 696
 697 static int etnaviv_gem_userptr_get_pages(struct etnaviv_gem_object *etnaviv_obj)
 698 {
 699         struct page **pvec = NULL;
 700         struct etnaviv_gem_userptr *userptr = &etnaviv_obj->userptr;
 701         int ret, pinned = 0, npages = etnaviv_obj->base.size >> PAGE_SHIFT;
 702
 703         might_lock_read(&current->mm->mmap_sem);
 704
 705         if (userptr->mm != current->mm)
 706                 return -EPERM;
 707
 708         pvec = kvmalloc_array(npages, sizeof(struct page *), GFP_KERNEL);
 709         if (!pvec)
 710                 return -ENOMEM;
 711
 712         do {
 713                 unsigned num_pages = npages - pinned;
 714                 uint64_t ptr = userptr->ptr + pinned * PAGE_SIZE;
 715                 struct page **pages = pvec + pinned;
 716
 717                 ret = get_user_pages_fast(ptr, num_pages,
 718                                           !userptr->ro ? FOLL_WRITE : 0, pages);
 719                 if (ret < 0) {
 720                         release_pages(pvec, pinned);
 721                         kvfree(pvec);
 722                         return ret;
 723                 }
 724
 725                 pinned += ret;
 726
 727         } while (pinned < npages);
 728
 729         etnaviv_obj->pages = pvec;
 730
 731         return 0;
 732 }
 733
 734 static void etnaviv_gem_userptr_release(struct etnaviv_gem_object *etnaviv_obj)
 735 {
 736         if (etnaviv_obj->sgt) {
 737                 etnaviv_gem_scatterlist_unmap(etnaviv_obj);
 738                 sg_free_table(etnaviv_obj->sgt);
 739                 kfree(etnaviv_obj->sgt);
 740         }
 741         if (etnaviv_obj->pages) {
 742                 int npages = etnaviv_obj->base.size >> PAGE_SHIFT;
 743
 744                 release_pages(etnaviv_obj->pages, npages);
 745                 kvfree(etnaviv_obj->pages);
 746         }
 747 }
 748
 749 static int etnaviv_gem_userptr_mmap_obj(struct etnaviv_gem_object *etnaviv_obj,
 750                 struct vm_area_struct *vma)
 751 {
 752         return -EINVAL;
 753 }
 754
 755 static const struct etnaviv_gem_ops etnaviv_gem_userptr_ops = {
 756         .get_pages = etnaviv_gem_userptr_get_pages,
 757         .release = etnaviv_gem_userptr_release,
 758         .vmap = etnaviv_gem_vmap_impl,
 759         .mmap = etnaviv_gem_userptr_mmap_obj,
 760 };
 761
 762 int etnaviv_gem_new_userptr(struct drm_device *dev, struct drm_file *file,
 763         uintptr_t ptr, u32 size, u32 flags, u32 *handle)
 764 {
 765         struct etnaviv_gem_object *etnaviv_obj;
 766         int ret;
 767
 768         ret = etnaviv_gem_new_private(dev, size, ETNA_BO_CACHED, NULL,
 769                                       &etnaviv_gem_userptr_ops, &etnaviv_obj);
 770         if (ret)
 771                 return ret;
 772
 773         lockdep_set_class(&etnaviv_obj->lock, &etnaviv_userptr_lock_class);
 774
 775         etnaviv_obj->userptr.ptr = ptr;
 776         etnaviv_obj->userptr.mm = current->mm;
 777         etnaviv_obj->userptr.ro = !(flags & ETNA_USERPTR_WRITE);
 778
 779         etnaviv_gem_obj_add(dev, &etnaviv_obj->base);
 780
 781         ret = drm_gem_handle_create(file, &etnaviv_obj->base, handle);
 782
 783         /* drop reference from allocate - handle holds it now */
 784         drm_gem_object_put_unlocked(&etnaviv_obj->base);
 785         return ret;
 786 }