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_PFNMAP;
 134         vma->vm_flags |= VM_MIXEDMAP;
 135
 136         vm_page_prot = vm_get_page_prot(vma->vm_flags);
 137
 138         if (etnaviv_obj->flags & ETNA_BO_WC) {
 139                 vma->vm_page_prot = pgprot_writecombine(vm_page_prot);
 140         } else if (etnaviv_obj->flags & ETNA_BO_UNCACHED) {
 141                 vma->vm_page_prot = pgprot_noncached(vm_page_prot);
 142         } else {
 143                 /*
 144                  * Shunt off cached objs to shmem file so they have their own
 145                  * address_space (so unmap_mapping_range does what we want,
 146                  * in particular in the case of mmap'd dmabufs)
 147                  */
 148                 vma->vm_pgoff = 0;
 149                 vma_set_file(vma, 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 static vm_fault_t 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 err;
 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 vmf_insert_page() is
 184          * specifically coded to take care of this, so we don't have to.
 185          */
 186         err = mutex_lock_interruptible(&etnaviv_obj->lock);
 187         if (err)
 188                 return VM_FAULT_NOPAGE;
 189         /* make sure we have pages attached now */
 190         pages = etnaviv_gem_get_pages(etnaviv_obj);
 191         mutex_unlock(&etnaviv_obj->lock);
 192
 193         if (IS_ERR(pages)) {
 194                 err = PTR_ERR(pages);
 195                 return vmf_error(err);
 196         }
 197
 198         /* We don't use vmf->pgoff since that has the fake offset: */
 199         pgoff = (vmf->address - vma->vm_start) >> PAGE_SHIFT;
 200
 201         page = pages[pgoff];
 202
 203         VERB("Inserting %p pfn %lx, pa %lx", (void *)vmf->address,
 204              page_to_pfn(page), page_to_pfn(page) << PAGE_SHIFT);
 205
 206         return vmf_insert_page(vma, vmf->address, page);
 207 }
 208
 209 int etnaviv_gem_mmap_offset(struct drm_gem_object *obj, u64 *offset)
 210 {
 211         int ret;
 212
 213         /* Make it mmapable */
 214         ret = drm_gem_create_mmap_offset(obj);
 215         if (ret)
 216                 dev_err(obj->dev->dev, "could not allocate mmap offset\n");
 217         else
 218                 *offset = drm_vma_node_offset_addr(&obj->vma_node);
 219
 220         return ret;
 221 }
 222
 223 static struct etnaviv_vram_mapping *
 224 etnaviv_gem_get_vram_mapping(struct etnaviv_gem_object *obj,
 225                              struct etnaviv_iommu_context *context)
 226 {
 227         struct etnaviv_vram_mapping *mapping;
 228
 229         list_for_each_entry(mapping, &obj->vram_list, obj_node) {
 230                 if (mapping->context == context)
 231                         return mapping;
 232         }
 233
 234         return NULL;
 235 }
 236
 237 void etnaviv_gem_mapping_unreference(struct etnaviv_vram_mapping *mapping)
 238 {
 239         struct etnaviv_gem_object *etnaviv_obj = mapping->object;
 240
 241         mutex_lock(&etnaviv_obj->lock);
 242         WARN_ON(mapping->use == 0);
 243         mapping->use -= 1;
 244         mutex_unlock(&etnaviv_obj->lock);
 245
 246         drm_gem_object_put(&etnaviv_obj->base);
 247 }
 248
 249 struct etnaviv_vram_mapping *etnaviv_gem_mapping_get(
 250         struct drm_gem_object *obj, struct etnaviv_iommu_context *mmu_context,
 251         u64 va)
 252 {
 253         struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
 254         struct etnaviv_vram_mapping *mapping;
 255         struct page **pages;
 256         int ret = 0;
 257
 258         mutex_lock(&etnaviv_obj->lock);
 259         mapping = etnaviv_gem_get_vram_mapping(etnaviv_obj, mmu_context);
 260         if (mapping) {
 261                 /*
 262                  * Holding the object lock prevents the use count changing
 263                  * beneath us.  If the use count is zero, the MMU might be
 264                  * reaping this object, so take the lock and re-check that
 265                  * the MMU owns this mapping to close this race.
 266                  */
 267                 if (mapping->use == 0) {
 268                         mutex_lock(&mmu_context->lock);
 269                         if (mapping->context == mmu_context)
 270                                 mapping->use += 1;
 271                         else
 272                                 mapping = NULL;
 273                         mutex_unlock(&mmu_context->lock);
 274                         if (mapping)
 275                                 goto out;
 276                 } else {
 277                         mapping->use += 1;
 278                         goto out;
 279                 }
 280         }
 281
 282         pages = etnaviv_gem_get_pages(etnaviv_obj);
 283         if (IS_ERR(pages)) {
 284                 ret = PTR_ERR(pages);
 285                 goto out;
 286         }
 287
 288         /*
 289          * See if we have a reaped vram mapping we can re-use before
 290          * allocating a fresh mapping.
 291          */
 292         mapping = etnaviv_gem_get_vram_mapping(etnaviv_obj, NULL);
 293         if (!mapping) {
 294                 mapping = kzalloc(sizeof(*mapping), GFP_KERNEL);
 295                 if (!mapping) {
 296                         ret = -ENOMEM;
 297                         goto out;
 298                 }
 299
 300                 INIT_LIST_HEAD(&mapping->scan_node);
 301                 mapping->object = etnaviv_obj;
 302         } else {
 303                 list_del(&mapping->obj_node);
 304         }
 305
 306         etnaviv_iommu_context_get(mmu_context);
 307         mapping->context = mmu_context;
 308         mapping->use = 1;
 309
 310         ret = etnaviv_iommu_map_gem(mmu_context, etnaviv_obj,
 311                                     mmu_context->global->memory_base,
 312                                     mapping, va);
 313         if (ret < 0) {
 314                 etnaviv_iommu_context_put(mmu_context);
 315                 kfree(mapping);
 316         } else {
 317                 list_add_tail(&mapping->obj_node, &etnaviv_obj->vram_list);
 318         }
 319
 320 out:
 321         mutex_unlock(&etnaviv_obj->lock);
 322
 323         if (ret)
 324                 return ERR_PTR(ret);
 325
 326         /* Take a reference on the object */
 327         drm_gem_object_get(obj);
 328         return mapping;
 329 }
 330
 331 void *etnaviv_gem_vmap(struct drm_gem_object *obj)
 332 {
 333         struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
 334
 335         if (etnaviv_obj->vaddr)
 336                 return etnaviv_obj->vaddr;
 337
 338         mutex_lock(&etnaviv_obj->lock);
 339         /*
 340          * Need to check again, as we might have raced with another thread
 341          * while waiting for the mutex.
 342          */
 343         if (!etnaviv_obj->vaddr)
 344                 etnaviv_obj->vaddr = etnaviv_obj->ops->vmap(etnaviv_obj);
 345         mutex_unlock(&etnaviv_obj->lock);
 346
 347         return etnaviv_obj->vaddr;
 348 }
 349
 350 static void *etnaviv_gem_vmap_impl(struct etnaviv_gem_object *obj)
 351 {
 352         struct page **pages;
 353
 354         lockdep_assert_held(&obj->lock);
 355
 356         pages = etnaviv_gem_get_pages(obj);
 357         if (IS_ERR(pages))
 358                 return NULL;
 359
 360         return vmap(pages, obj->base.size >> PAGE_SHIFT,
 361                         VM_MAP, pgprot_writecombine(PAGE_KERNEL));
 362 }
 363
 364 static inline enum dma_data_direction etnaviv_op_to_dma_dir(u32 op)
 365 {
 366         if (op & ETNA_PREP_READ)
 367                 return DMA_FROM_DEVICE;
 368         else if (op & ETNA_PREP_WRITE)
 369                 return DMA_TO_DEVICE;
 370         else
 371                 return DMA_BIDIRECTIONAL;
 372 }
 373
 374 int etnaviv_gem_cpu_prep(struct drm_gem_object *obj, u32 op,
 375                 struct drm_etnaviv_timespec *timeout)
 376 {
 377         struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
 378         struct drm_device *dev = obj->dev;
 379         bool write = !!(op & ETNA_PREP_WRITE);
 380         int ret;
 381
 382         if (!etnaviv_obj->sgt) {
 383                 void *ret;
 384
 385                 mutex_lock(&etnaviv_obj->lock);
 386                 ret = etnaviv_gem_get_pages(etnaviv_obj);
 387                 mutex_unlock(&etnaviv_obj->lock);
 388                 if (IS_ERR(ret))
 389                         return PTR_ERR(ret);
 390         }
 391
 392         if (op & ETNA_PREP_NOSYNC) {
 393                 if (!dma_resv_test_signaled_rcu(obj->resv,
 394                                                           write))
 395                         return -EBUSY;
 396         } else {
 397                 unsigned long remain = etnaviv_timeout_to_jiffies(timeout);
 398
 399                 ret = dma_resv_wait_timeout_rcu(obj->resv,
 400                                                           write, true, remain);
 401                 if (ret <= 0)
 402                         return ret == 0 ? -ETIMEDOUT : ret;
 403         }
 404
 405         if (etnaviv_obj->flags & ETNA_BO_CACHED) {
 406                 dma_sync_sgtable_for_cpu(dev->dev, etnaviv_obj->sgt,
 407                                          etnaviv_op_to_dma_dir(op));
 408                 etnaviv_obj->last_cpu_prep_op = op;
 409         }
 410
 411         return 0;
 412 }
 413
 414 int etnaviv_gem_cpu_fini(struct drm_gem_object *obj)
 415 {
 416         struct drm_device *dev = obj->dev;
 417         struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
 418
 419         if (etnaviv_obj->flags & ETNA_BO_CACHED) {
 420                 /* fini without a prep is almost certainly a userspace error */
 421                 WARN_ON(etnaviv_obj->last_cpu_prep_op == 0);
 422                 dma_sync_sgtable_for_device(dev->dev, etnaviv_obj->sgt,
 423                         etnaviv_op_to_dma_dir(etnaviv_obj->last_cpu_prep_op));
 424                 etnaviv_obj->last_cpu_prep_op = 0;
 425         }
 426
 427         return 0;
 428 }
 429
 430 int etnaviv_gem_wait_bo(struct etnaviv_gpu *gpu, struct drm_gem_object *obj,
 431         struct drm_etnaviv_timespec *timeout)
 432 {
 433         struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
 434
 435         return etnaviv_gpu_wait_obj_inactive(gpu, etnaviv_obj, timeout);
 436 }
 437
 438 #ifdef CONFIG_DEBUG_FS
 439 static void etnaviv_gem_describe_fence(struct dma_fence *fence,
 440         const char *type, struct seq_file *m)
 441 {
 442         if (!test_bit(DMA_FENCE_FLAG_SIGNALED_BIT, &fence->flags))
 443                 seq_printf(m, "\t%9s: %s %s seq %llu\n",
 444                            type,
 445                            fence->ops->get_driver_name(fence),
 446                            fence->ops->get_timeline_name(fence),
 447                            fence->seqno);
 448 }
 449
 450 static void etnaviv_gem_describe(struct drm_gem_object *obj, struct seq_file *m)
 451 {
 452         struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
 453         struct dma_resv *robj = obj->resv;
 454         struct dma_resv_list *fobj;
 455         struct dma_fence *fence;
 456         unsigned long off = drm_vma_node_start(&obj->vma_node);
 457
 458         seq_printf(m, "%08x: %c %2d (%2d) %08lx %p %zd\n",
 459                         etnaviv_obj->flags, is_active(etnaviv_obj) ? 'A' : 'I',
 460                         obj->name, kref_read(&obj->refcount),
 461                         off, etnaviv_obj->vaddr, obj->size);
 462
 463         rcu_read_lock();
 464         fobj = rcu_dereference(robj->fence);
 465         if (fobj) {
 466                 unsigned int i, shared_count = fobj->shared_count;
 467
 468                 for (i = 0; i < shared_count; i++) {
 469                         fence = rcu_dereference(fobj->shared[i]);
 470                         etnaviv_gem_describe_fence(fence, "Shared", m);
 471                 }
 472         }
 473
 474         fence = rcu_dereference(robj->fence_excl);
 475         if (fence)
 476                 etnaviv_gem_describe_fence(fence, "Exclusive", m);
 477         rcu_read_unlock();
 478 }
 479
 480 void etnaviv_gem_describe_objects(struct etnaviv_drm_private *priv,
 481         struct seq_file *m)
 482 {
 483         struct etnaviv_gem_object *etnaviv_obj;
 484         int count = 0;
 485         size_t size = 0;
 486
 487         mutex_lock(&priv->gem_lock);
 488         list_for_each_entry(etnaviv_obj, &priv->gem_list, gem_node) {
 489                 struct drm_gem_object *obj = &etnaviv_obj->base;
 490
 491                 seq_puts(m, "   ");
 492                 etnaviv_gem_describe(obj, m);
 493                 count++;
 494                 size += obj->size;
 495         }
 496         mutex_unlock(&priv->gem_lock);
 497
 498         seq_printf(m, "Total %d objects, %zu bytes\n", count, size);
 499 }
 500 #endif
 501
 502 static void etnaviv_gem_shmem_release(struct etnaviv_gem_object *etnaviv_obj)
 503 {
 504         vunmap(etnaviv_obj->vaddr);
 505         put_pages(etnaviv_obj);
 506 }
 507
 508 static const struct etnaviv_gem_ops etnaviv_gem_shmem_ops = {
 509         .get_pages = etnaviv_gem_shmem_get_pages,
 510         .release = etnaviv_gem_shmem_release,
 511         .vmap = etnaviv_gem_vmap_impl,
 512         .mmap = etnaviv_gem_mmap_obj,
 513 };
 514
 515 void etnaviv_gem_free_object(struct drm_gem_object *obj)
 516 {
 517         struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
 518         struct etnaviv_drm_private *priv = obj->dev->dev_private;
 519         struct etnaviv_vram_mapping *mapping, *tmp;
 520
 521         /* object should not be active */
 522         WARN_ON(is_active(etnaviv_obj));
 523
 524         mutex_lock(&priv->gem_lock);
 525         list_del(&etnaviv_obj->gem_node);
 526         mutex_unlock(&priv->gem_lock);
 527
 528         list_for_each_entry_safe(mapping, tmp, &etnaviv_obj->vram_list,
 529                                  obj_node) {
 530                 struct etnaviv_iommu_context *context = mapping->context;
 531
 532                 WARN_ON(mapping->use);
 533
 534                 if (context) {
 535                         etnaviv_iommu_unmap_gem(context, mapping);
 536                         etnaviv_iommu_context_put(context);
 537                 }
 538
 539                 list_del(&mapping->obj_node);
 540                 kfree(mapping);
 541         }
 542
 543         drm_gem_free_mmap_offset(obj);
 544         etnaviv_obj->ops->release(etnaviv_obj);
 545         drm_gem_object_release(obj);
 546
 547         kfree(etnaviv_obj);
 548 }
 549
 550 void etnaviv_gem_obj_add(struct drm_device *dev, struct drm_gem_object *obj)
 551 {
 552         struct etnaviv_drm_private *priv = dev->dev_private;
 553         struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
 554
 555         mutex_lock(&priv->gem_lock);
 556         list_add_tail(&etnaviv_obj->gem_node, &priv->gem_list);
 557         mutex_unlock(&priv->gem_lock);
 558 }
 559
 560 static const struct vm_operations_struct vm_ops = {
 561         .fault = etnaviv_gem_fault,
 562         .open = drm_gem_vm_open,
 563         .close = drm_gem_vm_close,
 564 };
 565
 566 static const struct drm_gem_object_funcs etnaviv_gem_object_funcs = {
 567         .free = etnaviv_gem_free_object,
 568         .pin = etnaviv_gem_prime_pin,
 569         .unpin = etnaviv_gem_prime_unpin,
 570         .get_sg_table = etnaviv_gem_prime_get_sg_table,
 571         .vmap = etnaviv_gem_prime_vmap,
 572         .vm_ops = &vm_ops,
 573 };
 574
 575 static int etnaviv_gem_new_impl(struct drm_device *dev, u32 size, u32 flags,
 576         const struct etnaviv_gem_ops *ops, struct drm_gem_object **obj)
 577 {
 578         struct etnaviv_gem_object *etnaviv_obj;
 579         unsigned sz = sizeof(*etnaviv_obj);
 580         bool valid = true;
 581
 582         /* validate flags */
 583         switch (flags & ETNA_BO_CACHE_MASK) {
 584         case ETNA_BO_UNCACHED:
 585         case ETNA_BO_CACHED:
 586         case ETNA_BO_WC:
 587                 break;
 588         default:
 589                 valid = false;
 590         }
 591
 592         if (!valid) {
 593                 dev_err(dev->dev, "invalid cache flag: %x\n",
 594                         (flags & ETNA_BO_CACHE_MASK));
 595                 return -EINVAL;
 596         }
 597
 598         etnaviv_obj = kzalloc(sz, GFP_KERNEL);
 599         if (!etnaviv_obj)
 600                 return -ENOMEM;
 601
 602         etnaviv_obj->flags = flags;
 603         etnaviv_obj->ops = ops;
 604
 605         mutex_init(&etnaviv_obj->lock);
 606         INIT_LIST_HEAD(&etnaviv_obj->vram_list);
 607
 608         *obj = &etnaviv_obj->base;
 609         (*obj)->funcs = &etnaviv_gem_object_funcs;
 610
 611         return 0;
 612 }
 613
 614 /* convenience method to construct a GEM buffer object, and userspace handle */
 615 int etnaviv_gem_new_handle(struct drm_device *dev, struct drm_file *file,
 616         u32 size, u32 flags, u32 *handle)
 617 {
 618         struct etnaviv_drm_private *priv = dev->dev_private;
 619         struct drm_gem_object *obj = NULL;
 620         int ret;
 621
 622         size = PAGE_ALIGN(size);
 623
 624         ret = etnaviv_gem_new_impl(dev, size, flags,
 625                                    &etnaviv_gem_shmem_ops, &obj);
 626         if (ret)
 627                 goto fail;
 628
 629         lockdep_set_class(&to_etnaviv_bo(obj)->lock, &etnaviv_shm_lock_class);
 630
 631         ret = drm_gem_object_init(dev, obj, size);
 632         if (ret)
 633                 goto fail;
 634
 635         /*
 636          * Our buffers are kept pinned, so allocating them from the MOVABLE
 637          * zone is a really bad idea, and conflicts with CMA. See comments
 638          * above new_inode() why this is required _and_ expected if you're
 639          * going to pin these pages.
 640          */
 641         mapping_set_gfp_mask(obj->filp->f_mapping, priv->shm_gfp_mask);
 642
 643         etnaviv_gem_obj_add(dev, obj);
 644
 645         ret = drm_gem_handle_create(file, obj, handle);
 646
 647         /* drop reference from allocate - handle holds it now */
 648 fail:
 649         drm_gem_object_put(obj);
 650
 651         return ret;
 652 }
 653
 654 int etnaviv_gem_new_private(struct drm_device *dev, size_t size, u32 flags,
 655         const struct etnaviv_gem_ops *ops, struct etnaviv_gem_object **res)
 656 {
 657         struct drm_gem_object *obj;
 658         int ret;
 659
 660         ret = etnaviv_gem_new_impl(dev, size, flags, ops, &obj);
 661         if (ret)
 662                 return ret;
 663
 664         drm_gem_private_object_init(dev, obj, size);
 665
 666         *res = to_etnaviv_bo(obj);
 667
 668         return 0;
 669 }
 670
 671 static int etnaviv_gem_userptr_get_pages(struct etnaviv_gem_object *etnaviv_obj)
 672 {
 673         struct page **pvec = NULL;
 674         struct etnaviv_gem_userptr *userptr = &etnaviv_obj->userptr;
 675         int ret, pinned = 0, npages = etnaviv_obj->base.size >> PAGE_SHIFT;
 676
 677         might_lock_read(&current->mm->mmap_lock);
 678
 679         if (userptr->mm != current->mm)
 680                 return -EPERM;
 681
 682         pvec = kvmalloc_array(npages, sizeof(struct page *), GFP_KERNEL);
 683         if (!pvec)
 684                 return -ENOMEM;
 685
 686         do {
 687                 unsigned num_pages = npages - pinned;
 688                 uint64_t ptr = userptr->ptr + pinned * PAGE_SIZE;
 689                 struct page **pages = pvec + pinned;
 690
 691                 ret = pin_user_pages_fast(ptr, num_pages,
 692                                           !userptr->ro ? FOLL_WRITE : 0, pages);
 693                 if (ret < 0) {
 694                         unpin_user_pages(pvec, pinned);
 695                         kvfree(pvec);
 696                         return ret;
 697                 }
 698
 699                 pinned += ret;
 700
 701         } while (pinned < npages);
 702
 703         etnaviv_obj->pages = pvec;
 704
 705         return 0;
 706 }
 707
 708 static void etnaviv_gem_userptr_release(struct etnaviv_gem_object *etnaviv_obj)
 709 {
 710         if (etnaviv_obj->sgt) {
 711                 etnaviv_gem_scatterlist_unmap(etnaviv_obj);
 712                 sg_free_table(etnaviv_obj->sgt);
 713                 kfree(etnaviv_obj->sgt);
 714         }
 715         if (etnaviv_obj->pages) {
 716                 int npages = etnaviv_obj->base.size >> PAGE_SHIFT;
 717
 718                 unpin_user_pages(etnaviv_obj->pages, npages);
 719                 kvfree(etnaviv_obj->pages);
 720         }
 721 }
 722
 723 static int etnaviv_gem_userptr_mmap_obj(struct etnaviv_gem_object *etnaviv_obj,
 724                 struct vm_area_struct *vma)
 725 {
 726         return -EINVAL;
 727 }
 728
 729 static const struct etnaviv_gem_ops etnaviv_gem_userptr_ops = {
 730         .get_pages = etnaviv_gem_userptr_get_pages,
 731         .release = etnaviv_gem_userptr_release,
 732         .vmap = etnaviv_gem_vmap_impl,
 733         .mmap = etnaviv_gem_userptr_mmap_obj,
 734 };
 735
 736 int etnaviv_gem_new_userptr(struct drm_device *dev, struct drm_file *file,
 737         uintptr_t ptr, u32 size, u32 flags, u32 *handle)
 738 {
 739         struct etnaviv_gem_object *etnaviv_obj;
 740         int ret;
 741
 742         ret = etnaviv_gem_new_private(dev, size, ETNA_BO_CACHED,
 743                                       &etnaviv_gem_userptr_ops, &etnaviv_obj);
 744         if (ret)
 745                 return ret;
 746
 747         lockdep_set_class(&etnaviv_obj->lock, &etnaviv_userptr_lock_class);
 748
 749         etnaviv_obj->userptr.ptr = ptr;
 750         etnaviv_obj->userptr.mm = current->mm;
 751         etnaviv_obj->userptr.ro = !(flags & ETNA_USERPTR_WRITE);
 752
 753         etnaviv_gem_obj_add(dev, &etnaviv_obj->base);
 754
 755         ret = drm_gem_handle_create(file, &etnaviv_obj->base, handle);
 756
 757         /* drop reference from allocate - handle holds it now */
 758         drm_gem_object_put(&etnaviv_obj->base);
 759         return ret;
 760 }