root/drivers/gpu/drm/etnaviv/etnaviv_gem.c

DEFINITIONS

1. etnaviv_gem_scatter_map
2. etnaviv_gem_scatterlist_unmap
3. etnaviv_gem_shmem_get_pages
4. put_pages
5. etnaviv_gem_get_pages
6. etnaviv_gem_put_pages
7. etnaviv_gem_mmap_obj
8. etnaviv_gem_mmap
9. etnaviv_gem_fault
10. etnaviv_gem_mmap_offset
11. etnaviv_gem_get_vram_mapping
12. etnaviv_gem_mapping_unreference
13. etnaviv_gem_mapping_get
14. etnaviv_gem_vmap
15. etnaviv_gem_vmap_impl
16. etnaviv_op_to_dma_dir
17. etnaviv_gem_cpu_prep
18. etnaviv_gem_cpu_fini
19. etnaviv_gem_wait_bo
20. etnaviv_gem_describe_fence
21. etnaviv_gem_describe
22. etnaviv_gem_describe_objects
23. etnaviv_gem_shmem_release
24. etnaviv_gem_free_object
25. etnaviv_gem_obj_add
26. etnaviv_gem_new_impl
27. etnaviv_gem_new_handle
28. etnaviv_gem_new_private
29. etnaviv_gem_userptr_get_pages
30. etnaviv_gem_userptr_release
31. etnaviv_gem_userptr_mmap_obj
32. etnaviv_gem_new_userptr

   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_sg(dev->dev, sgt->sgl, sgt->nents, DMA_BIDIRECTIONAL);
  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_sg(dev->dev, sgt->sgl, sgt->nents, DMA_BIDIRECTIONAL);
  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->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         vma->vm_flags &= ~VM_PFNMAP;
 133         vma->vm_flags |= VM_MIXEDMAP;
 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                 fput(vma->vm_file);
 148                 get_file(etnaviv_obj->base.filp);
 149                 vma->vm_pgoff = 0;
 150                 vma->vm_file  = etnaviv_obj->base.filp;
 151 
 152                 vma->vm_page_prot = vm_page_prot;
 153         }
 154 
 155         return 0;
 156 }
 157 
 158 int etnaviv_gem_mmap(struct file *filp, struct vm_area_struct *vma)
 159 {
 160         struct etnaviv_gem_object *obj;
 161         int ret;
 162 
 163         ret = drm_gem_mmap(filp, vma);
 164         if (ret) {
 165                 DBG("mmap failed: %d", ret);
 166                 return ret;
 167         }
 168 
 169         obj = to_etnaviv_bo(vma->vm_private_data);
 170         return obj->ops->mmap(obj, vma);
 171 }
 172 
 173 vm_fault_t etnaviv_gem_fault(struct vm_fault *vmf)
 174 {
 175         struct vm_area_struct *vma = vmf->vma;
 176         struct drm_gem_object *obj = vma->vm_private_data;
 177         struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
 178         struct page **pages, *page;
 179         pgoff_t pgoff;
 180         int err;
 181 
 182         /*
 183          * Make sure we don't parallel update on a fault, nor move or remove
 184          * something from beneath our feet.  Note that vmf_insert_page() is
 185          * specifically coded to take care of this, so we don't have to.
 186          */
 187         err = mutex_lock_interruptible(&etnaviv_obj->lock);
 188         if (err)
 189                 return VM_FAULT_NOPAGE;
 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                 err = PTR_ERR(pages);
 196                 return vmf_error(err);
 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         return vmf_insert_page(vma, vmf->address, page);
 208 }
 209 
 210 int etnaviv_gem_mmap_offset(struct drm_gem_object *obj, u64 *offset)
 211 {
 212         int ret;
 213 
 214         /* Make it mmapable */
 215         ret = drm_gem_create_mmap_offset(obj);
 216         if (ret)
 217                 dev_err(obj->dev->dev, "could not allocate mmap offset\n");
 218         else
 219                 *offset = drm_vma_node_offset_addr(&obj->vma_node);
 220 
 221         return ret;
 222 }
 223 
 224 static struct etnaviv_vram_mapping *
 225 etnaviv_gem_get_vram_mapping(struct etnaviv_gem_object *obj,
 226                              struct etnaviv_iommu_context *context)
 227 {
 228         struct etnaviv_vram_mapping *mapping;
 229 
 230         list_for_each_entry(mapping, &obj->vram_list, obj_node) {
 231                 if (mapping->context == context)
 232                         return mapping;
 233         }
 234 
 235         return NULL;
 236 }
 237 
 238 void etnaviv_gem_mapping_unreference(struct etnaviv_vram_mapping *mapping)
 239 {
 240         struct etnaviv_gem_object *etnaviv_obj = mapping->object;
 241 
 242         mutex_lock(&etnaviv_obj->lock);
 243         WARN_ON(mapping->use == 0);
 244         mapping->use -= 1;
 245         mutex_unlock(&etnaviv_obj->lock);
 246 
 247         drm_gem_object_put_unlocked(&etnaviv_obj->base);
 248 }
 249 
 250 struct etnaviv_vram_mapping *etnaviv_gem_mapping_get(
 251         struct drm_gem_object *obj, struct etnaviv_iommu_context *mmu_context,
 252         u64 va)
 253 {
 254         struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
 255         struct etnaviv_vram_mapping *mapping;
 256         struct page **pages;
 257         int ret = 0;
 258 
 259         mutex_lock(&etnaviv_obj->lock);
 260         mapping = etnaviv_gem_get_vram_mapping(etnaviv_obj, mmu_context);
 261         if (mapping) {
 262                 /*
 263                  * Holding the object lock prevents the use count changing
 264                  * beneath us.  If the use count is zero, the MMU might be
 265                  * reaping this object, so take the lock and re-check that
 266                  * the MMU owns this mapping to close this race.
 267                  */
 268                 if (mapping->use == 0) {
 269                         mutex_lock(&mmu_context->lock);
 270                         if (mapping->context == mmu_context)
 271                                 mapping->use += 1;
 272                         else
 273                                 mapping = NULL;
 274                         mutex_unlock(&mmu_context->lock);
 275                         if (mapping)
 276                                 goto out;
 277                 } else {
 278                         mapping->use += 1;
 279                         goto out;
 280                 }
 281         }
 282 
 283         pages = etnaviv_gem_get_pages(etnaviv_obj);
 284         if (IS_ERR(pages)) {
 285                 ret = PTR_ERR(pages);
 286                 goto out;
 287         }
 288 
 289         /*
 290          * See if we have a reaped vram mapping we can re-use before
 291          * allocating a fresh mapping.
 292          */
 293         mapping = etnaviv_gem_get_vram_mapping(etnaviv_obj, NULL);
 294         if (!mapping) {
 295                 mapping = kzalloc(sizeof(*mapping), GFP_KERNEL);
 296                 if (!mapping) {
 297                         ret = -ENOMEM;
 298                         goto out;
 299                 }
 300 
 301                 INIT_LIST_HEAD(&mapping->scan_node);
 302                 mapping->object = etnaviv_obj;
 303         } else {
 304                 list_del(&mapping->obj_node);
 305         }
 306 
 307         etnaviv_iommu_context_get(mmu_context);
 308         mapping->context = mmu_context;
 309         mapping->use = 1;
 310 
 311         ret = etnaviv_iommu_map_gem(mmu_context, etnaviv_obj,
 312                                     mmu_context->global->memory_base,
 313                                     mapping, va);
 314         if (ret < 0) {
 315                 etnaviv_iommu_context_put(mmu_context);
 316                 kfree(mapping);
 317         } else {
 318                 list_add_tail(&mapping->obj_node, &etnaviv_obj->vram_list);
 319         }
 320 
 321 out:
 322         mutex_unlock(&etnaviv_obj->lock);
 323 
 324         if (ret)
 325                 return ERR_PTR(ret);
 326 
 327         /* Take a reference on the object */
 328         drm_gem_object_get(obj);
 329         return mapping;
 330 }
 331 
 332 void *etnaviv_gem_vmap(struct drm_gem_object *obj)
 333 {
 334         struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
 335 
 336         if (etnaviv_obj->vaddr)
 337                 return etnaviv_obj->vaddr;
 338 
 339         mutex_lock(&etnaviv_obj->lock);
 340         /*
 341          * Need to check again, as we might have raced with another thread
 342          * while waiting for the mutex.
 343          */
 344         if (!etnaviv_obj->vaddr)
 345                 etnaviv_obj->vaddr = etnaviv_obj->ops->vmap(etnaviv_obj);
 346         mutex_unlock(&etnaviv_obj->lock);
 347 
 348         return etnaviv_obj->vaddr;
 349 }
 350 
 351 static void *etnaviv_gem_vmap_impl(struct etnaviv_gem_object *obj)
 352 {
 353         struct page **pages;
 354 
 355         lockdep_assert_held(&obj->lock);
 356 
 357         pages = etnaviv_gem_get_pages(obj);
 358         if (IS_ERR(pages))
 359                 return NULL;
 360 
 361         return vmap(pages, obj->base.size >> PAGE_SHIFT,
 362                         VM_MAP, pgprot_writecombine(PAGE_KERNEL));
 363 }
 364 
 365 static inline enum dma_data_direction etnaviv_op_to_dma_dir(u32 op)
 366 {
 367         if (op & ETNA_PREP_READ)
 368                 return DMA_FROM_DEVICE;
 369         else if (op & ETNA_PREP_WRITE)
 370                 return DMA_TO_DEVICE;
 371         else
 372                 return DMA_BIDIRECTIONAL;
 373 }
 374 
 375 int etnaviv_gem_cpu_prep(struct drm_gem_object *obj, u32 op,
 376                 struct timespec *timeout)
 377 {
 378         struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
 379         struct drm_device *dev = obj->dev;
 380         bool write = !!(op & ETNA_PREP_WRITE);
 381         int ret;
 382 
 383         if (!etnaviv_obj->sgt) {
 384                 void *ret;
 385 
 386                 mutex_lock(&etnaviv_obj->lock);
 387                 ret = etnaviv_gem_get_pages(etnaviv_obj);
 388                 mutex_unlock(&etnaviv_obj->lock);
 389                 if (IS_ERR(ret))
 390                         return PTR_ERR(ret);
 391         }
 392 
 393         if (op & ETNA_PREP_NOSYNC) {
 394                 if (!dma_resv_test_signaled_rcu(obj->resv,
 395                                                           write))
 396                         return -EBUSY;
 397         } else {
 398                 unsigned long remain = etnaviv_timeout_to_jiffies(timeout);
 399 
 400                 ret = dma_resv_wait_timeout_rcu(obj->resv,
 401                                                           write, true, remain);
 402                 if (ret <= 0)
 403                         return ret == 0 ? -ETIMEDOUT : ret;
 404         }
 405 
 406         if (etnaviv_obj->flags & ETNA_BO_CACHED) {
 407                 dma_sync_sg_for_cpu(dev->dev, etnaviv_obj->sgt->sgl,
 408                                     etnaviv_obj->sgt->nents,
 409                                     etnaviv_op_to_dma_dir(op));
 410                 etnaviv_obj->last_cpu_prep_op = op;
 411         }
 412 
 413         return 0;
 414 }
 415 
 416 int etnaviv_gem_cpu_fini(struct drm_gem_object *obj)
 417 {
 418         struct drm_device *dev = obj->dev;
 419         struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
 420 
 421         if (etnaviv_obj->flags & ETNA_BO_CACHED) {
 422                 /* fini without a prep is almost certainly a userspace error */
 423                 WARN_ON(etnaviv_obj->last_cpu_prep_op == 0);
 424                 dma_sync_sg_for_device(dev->dev, etnaviv_obj->sgt->sgl,
 425                         etnaviv_obj->sgt->nents,
 426                         etnaviv_op_to_dma_dir(etnaviv_obj->last_cpu_prep_op));
 427                 etnaviv_obj->last_cpu_prep_op = 0;
 428         }
 429 
 430         return 0;
 431 }
 432 
 433 int etnaviv_gem_wait_bo(struct etnaviv_gpu *gpu, struct drm_gem_object *obj,
 434         struct timespec *timeout)
 435 {
 436         struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
 437 
 438         return etnaviv_gpu_wait_obj_inactive(gpu, etnaviv_obj, timeout);
 439 }
 440 
 441 #ifdef CONFIG_DEBUG_FS
 442 static void etnaviv_gem_describe_fence(struct dma_fence *fence,
 443         const char *type, struct seq_file *m)
 444 {
 445         if (!test_bit(DMA_FENCE_FLAG_SIGNALED_BIT, &fence->flags))
 446                 seq_printf(m, "\t%9s: %s %s seq %llu\n",
 447                            type,
 448                            fence->ops->get_driver_name(fence),
 449                            fence->ops->get_timeline_name(fence),
 450                            fence->seqno);
 451 }
 452 
 453 static void etnaviv_gem_describe(struct drm_gem_object *obj, struct seq_file *m)
 454 {
 455         struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
 456         struct dma_resv *robj = obj->resv;
 457         struct dma_resv_list *fobj;
 458         struct dma_fence *fence;
 459         unsigned long off = drm_vma_node_start(&obj->vma_node);
 460 
 461         seq_printf(m, "%08x: %c %2d (%2d) %08lx %p %zd\n",
 462                         etnaviv_obj->flags, is_active(etnaviv_obj) ? 'A' : 'I',
 463                         obj->name, kref_read(&obj->refcount),
 464                         off, etnaviv_obj->vaddr, obj->size);
 465 
 466         rcu_read_lock();
 467         fobj = rcu_dereference(robj->fence);
 468         if (fobj) {
 469                 unsigned int i, shared_count = fobj->shared_count;
 470 
 471                 for (i = 0; i < shared_count; i++) {
 472                         fence = rcu_dereference(fobj->shared[i]);
 473                         etnaviv_gem_describe_fence(fence, "Shared", m);
 474                 }
 475         }
 476 
 477         fence = rcu_dereference(robj->fence_excl);
 478         if (fence)
 479                 etnaviv_gem_describe_fence(fence, "Exclusive", m);
 480         rcu_read_unlock();
 481 }
 482 
 483 void etnaviv_gem_describe_objects(struct etnaviv_drm_private *priv,
 484         struct seq_file *m)
 485 {
 486         struct etnaviv_gem_object *etnaviv_obj;
 487         int count = 0;
 488         size_t size = 0;
 489 
 490         mutex_lock(&priv->gem_lock);
 491         list_for_each_entry(etnaviv_obj, &priv->gem_list, gem_node) {
 492                 struct drm_gem_object *obj = &etnaviv_obj->base;
 493 
 494                 seq_puts(m, "   ");
 495                 etnaviv_gem_describe(obj, m);
 496                 count++;
 497                 size += obj->size;
 498         }
 499         mutex_unlock(&priv->gem_lock);
 500 
 501         seq_printf(m, "Total %d objects, %zu bytes\n", count, size);
 502 }
 503 #endif
 504 
 505 static void etnaviv_gem_shmem_release(struct etnaviv_gem_object *etnaviv_obj)
 506 {
 507         vunmap(etnaviv_obj->vaddr);
 508         put_pages(etnaviv_obj);
 509 }
 510 
 511 static const struct etnaviv_gem_ops etnaviv_gem_shmem_ops = {
 512         .get_pages = etnaviv_gem_shmem_get_pages,
 513         .release = etnaviv_gem_shmem_release,
 514         .vmap = etnaviv_gem_vmap_impl,
 515         .mmap = etnaviv_gem_mmap_obj,
 516 };
 517 
 518 void etnaviv_gem_free_object(struct drm_gem_object *obj)
 519 {
 520         struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
 521         struct etnaviv_drm_private *priv = obj->dev->dev_private;
 522         struct etnaviv_vram_mapping *mapping, *tmp;
 523 
 524         /* object should not be active */
 525         WARN_ON(is_active(etnaviv_obj));
 526 
 527         mutex_lock(&priv->gem_lock);
 528         list_del(&etnaviv_obj->gem_node);
 529         mutex_unlock(&priv->gem_lock);
 530 
 531         list_for_each_entry_safe(mapping, tmp, &etnaviv_obj->vram_list,
 532                                  obj_node) {
 533                 struct etnaviv_iommu_context *context = mapping->context;
 534 
 535                 WARN_ON(mapping->use);
 536 
 537                 if (context) {
 538                         etnaviv_iommu_unmap_gem(context, mapping);
 539                         etnaviv_iommu_context_put(context);
 540                 }
 541 
 542                 list_del(&mapping->obj_node);
 543                 kfree(mapping);
 544         }
 545 
 546         drm_gem_free_mmap_offset(obj);
 547         etnaviv_obj->ops->release(etnaviv_obj);
 548         drm_gem_object_release(obj);
 549 
 550         kfree(etnaviv_obj);
 551 }
 552 
 553 void etnaviv_gem_obj_add(struct drm_device *dev, struct drm_gem_object *obj)
 554 {
 555         struct etnaviv_drm_private *priv = dev->dev_private;
 556         struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
 557 
 558         mutex_lock(&priv->gem_lock);
 559         list_add_tail(&etnaviv_obj->gem_node, &priv->gem_list);
 560         mutex_unlock(&priv->gem_lock);
 561 }
 562 
 563 static int etnaviv_gem_new_impl(struct drm_device *dev, u32 size, u32 flags,
 564         const struct etnaviv_gem_ops *ops, struct drm_gem_object **obj)
 565 {
 566         struct etnaviv_gem_object *etnaviv_obj;
 567         unsigned sz = sizeof(*etnaviv_obj);
 568         bool valid = true;
 569 
 570         /* validate flags */
 571         switch (flags & ETNA_BO_CACHE_MASK) {
 572         case ETNA_BO_UNCACHED:
 573         case ETNA_BO_CACHED:
 574         case ETNA_BO_WC:
 575                 break;
 576         default:
 577                 valid = false;
 578         }
 579 
 580         if (!valid) {
 581                 dev_err(dev->dev, "invalid cache flag: %x\n",
 582                         (flags & ETNA_BO_CACHE_MASK));
 583                 return -EINVAL;
 584         }
 585 
 586         etnaviv_obj = kzalloc(sz, GFP_KERNEL);
 587         if (!etnaviv_obj)
 588                 return -ENOMEM;
 589 
 590         etnaviv_obj->flags = flags;
 591         etnaviv_obj->ops = ops;
 592 
 593         mutex_init(&etnaviv_obj->lock);
 594         INIT_LIST_HEAD(&etnaviv_obj->vram_list);
 595 
 596         *obj = &etnaviv_obj->base;
 597 
 598         return 0;
 599 }
 600 
 601 /* convenience method to construct a GEM buffer object, and userspace handle */
 602 int etnaviv_gem_new_handle(struct drm_device *dev, struct drm_file *file,
 603         u32 size, u32 flags, u32 *handle)
 604 {
 605         struct drm_gem_object *obj = NULL;
 606         int ret;
 607 
 608         size = PAGE_ALIGN(size);
 609 
 610         ret = etnaviv_gem_new_impl(dev, size, flags,
 611                                    &etnaviv_gem_shmem_ops, &obj);
 612         if (ret)
 613                 goto fail;
 614 
 615         lockdep_set_class(&to_etnaviv_bo(obj)->lock, &etnaviv_shm_lock_class);
 616 
 617         ret = drm_gem_object_init(dev, obj, size);
 618         if (ret)
 619                 goto fail;
 620 
 621         /*
 622          * Our buffers are kept pinned, so allocating them from the MOVABLE
 623          * zone is a really bad idea, and conflicts with CMA. See comments
 624          * above new_inode() why this is required _and_ expected if you're
 625          * going to pin these pages.
 626          */
 627         mapping_set_gfp_mask(obj->filp->f_mapping, GFP_HIGHUSER |
 628                              __GFP_RETRY_MAYFAIL | __GFP_NOWARN);
 629 
 630         etnaviv_gem_obj_add(dev, obj);
 631 
 632         ret = drm_gem_handle_create(file, obj, handle);
 633 
 634         /* drop reference from allocate - handle holds it now */
 635 fail:
 636         drm_gem_object_put_unlocked(obj);
 637 
 638         return ret;
 639 }
 640 
 641 int etnaviv_gem_new_private(struct drm_device *dev, size_t size, u32 flags,
 642         const struct etnaviv_gem_ops *ops, struct etnaviv_gem_object **res)
 643 {
 644         struct drm_gem_object *obj;
 645         int ret;
 646 
 647         ret = etnaviv_gem_new_impl(dev, size, flags, ops, &obj);
 648         if (ret)
 649                 return ret;
 650 
 651         drm_gem_private_object_init(dev, obj, size);
 652 
 653         *res = to_etnaviv_bo(obj);
 654 
 655         return 0;
 656 }
 657 
 658 static int etnaviv_gem_userptr_get_pages(struct etnaviv_gem_object *etnaviv_obj)
 659 {
 660         struct page **pvec = NULL;
 661         struct etnaviv_gem_userptr *userptr = &etnaviv_obj->userptr;
 662         int ret, pinned = 0, npages = etnaviv_obj->base.size >> PAGE_SHIFT;
 663 
 664         might_lock_read(&current->mm->mmap_sem);
 665 
 666         if (userptr->mm != current->mm)
 667                 return -EPERM;
 668 
 669         pvec = kvmalloc_array(npages, sizeof(struct page *), GFP_KERNEL);
 670         if (!pvec)
 671                 return -ENOMEM;
 672 
 673         do {
 674                 unsigned num_pages = npages - pinned;
 675                 uint64_t ptr = userptr->ptr + pinned * PAGE_SIZE;
 676                 struct page **pages = pvec + pinned;
 677 
 678                 ret = get_user_pages_fast(ptr, num_pages,
 679                                           !userptr->ro ? FOLL_WRITE : 0, pages);
 680                 if (ret < 0) {
 681                         release_pages(pvec, pinned);
 682                         kvfree(pvec);
 683                         return ret;
 684                 }
 685 
 686                 pinned += ret;
 687 
 688         } while (pinned < npages);
 689 
 690         etnaviv_obj->pages = pvec;
 691 
 692         return 0;
 693 }
 694 
 695 static void etnaviv_gem_userptr_release(struct etnaviv_gem_object *etnaviv_obj)
 696 {
 697         if (etnaviv_obj->sgt) {
 698                 etnaviv_gem_scatterlist_unmap(etnaviv_obj);
 699                 sg_free_table(etnaviv_obj->sgt);
 700                 kfree(etnaviv_obj->sgt);
 701         }
 702         if (etnaviv_obj->pages) {
 703                 int npages = etnaviv_obj->base.size >> PAGE_SHIFT;
 704 
 705                 release_pages(etnaviv_obj->pages, npages);
 706                 kvfree(etnaviv_obj->pages);
 707         }
 708 }
 709 
 710 static int etnaviv_gem_userptr_mmap_obj(struct etnaviv_gem_object *etnaviv_obj,
 711                 struct vm_area_struct *vma)
 712 {
 713         return -EINVAL;
 714 }
 715 
 716 static const struct etnaviv_gem_ops etnaviv_gem_userptr_ops = {
 717         .get_pages = etnaviv_gem_userptr_get_pages,
 718         .release = etnaviv_gem_userptr_release,
 719         .vmap = etnaviv_gem_vmap_impl,
 720         .mmap = etnaviv_gem_userptr_mmap_obj,
 721 };
 722 
 723 int etnaviv_gem_new_userptr(struct drm_device *dev, struct drm_file *file,
 724         uintptr_t ptr, u32 size, u32 flags, u32 *handle)
 725 {
 726         struct etnaviv_gem_object *etnaviv_obj;
 727         int ret;
 728 
 729         ret = etnaviv_gem_new_private(dev, size, ETNA_BO_CACHED,
 730                                       &etnaviv_gem_userptr_ops, &etnaviv_obj);
 731         if (ret)
 732                 return ret;
 733 
 734         lockdep_set_class(&etnaviv_obj->lock, &etnaviv_userptr_lock_class);
 735 
 736         etnaviv_obj->userptr.ptr = ptr;
 737         etnaviv_obj->userptr.mm = current->mm;
 738         etnaviv_obj->userptr.ro = !(flags & ETNA_USERPTR_WRITE);
 739 
 740         etnaviv_gem_obj_add(dev, &etnaviv_obj->base);
 741 
 742         ret = drm_gem_handle_create(file, &etnaviv_obj->base, handle);
 743 
 744         /* drop reference from allocate - handle holds it now */
 745         drm_gem_object_put_unlocked(&etnaviv_obj->base);
 746         return ret;
 747 }