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 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 *mmu)
 226 {
 227         struct etnaviv_vram_mapping *mapping;
 228
 229         list_for_each_entry(mapping, &obj->vram_list, obj_node) {
 230                 if (mapping->mmu == mmu)
 231                         return mapping;
 232         }
 233
 234         return NULL;
 235 }
 236
 237 void etnaviv_gem_mapping_reference(struct etnaviv_vram_mapping *mapping)
 238 {
 239         struct etnaviv_gem_object *etnaviv_obj = mapping->object;
 240
 241         drm_gem_object_get(&etnaviv_obj->base);
 242
 243         mutex_lock(&etnaviv_obj->lock);
 244         WARN_ON(mapping->use == 0);
 245         mapping->use += 1;
 246         mutex_unlock(&etnaviv_obj->lock);
 247 }
 248
 249 void etnaviv_gem_mapping_unreference(struct etnaviv_vram_mapping *mapping)
 250 {
 251         struct etnaviv_gem_object *etnaviv_obj = mapping->object;
 252
 253         mutex_lock(&etnaviv_obj->lock);
 254         WARN_ON(mapping->use == 0);
 255         mapping->use -= 1;
 256         mutex_unlock(&etnaviv_obj->lock);
 257
 258         drm_gem_object_put_unlocked(&etnaviv_obj->base);
 259 }
 260
 261 struct etnaviv_vram_mapping *etnaviv_gem_mapping_get(
 262         struct drm_gem_object *obj, struct etnaviv_gpu *gpu)
 263 {
 264         struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
 265         struct etnaviv_vram_mapping *mapping;
 266         struct page **pages;
 267         int ret = 0;
 268
 269         mutex_lock(&etnaviv_obj->lock);
 270         mapping = etnaviv_gem_get_vram_mapping(etnaviv_obj, gpu->mmu);
 271         if (mapping) {
 272                 /*
 273                  * Holding the object lock prevents the use count changing
 274                  * beneath us.  If the use count is zero, the MMU might be
 275                  * reaping this object, so take the lock and re-check that
 276                  * the MMU owns this mapping to close this race.
 277                  */
 278                 if (mapping->use == 0) {
 279                         mutex_lock(&gpu->mmu->lock);
 280                         if (mapping->mmu == gpu->mmu)
 281                                 mapping->use += 1;
 282                         else
 283                                 mapping = NULL;
 284                         mutex_unlock(&gpu->mmu->lock);
 285                         if (mapping)
 286                                 goto out;
 287                 } else {
 288                         mapping->use += 1;
 289                         goto out;
 290                 }
 291         }
 292
 293         pages = etnaviv_gem_get_pages(etnaviv_obj);
 294         if (IS_ERR(pages)) {
 295                 ret = PTR_ERR(pages);
 296                 goto out;
 297         }
 298
 299         /*
 300          * See if we have a reaped vram mapping we can re-use before
 301          * allocating a fresh mapping.
 302          */
 303         mapping = etnaviv_gem_get_vram_mapping(etnaviv_obj, NULL);
 304         if (!mapping) {
 305                 mapping = kzalloc(sizeof(*mapping), GFP_KERNEL);
 306                 if (!mapping) {
 307                         ret = -ENOMEM;
 308                         goto out;
 309                 }
 310
 311                 INIT_LIST_HEAD(&mapping->scan_node);
 312                 mapping->object = etnaviv_obj;
 313         } else {
 314                 list_del(&mapping->obj_node);
 315         }
 316
 317         mapping->mmu = gpu->mmu;
 318         mapping->use = 1;
 319
 320         ret = etnaviv_iommu_map_gem(gpu->mmu, etnaviv_obj, gpu->memory_base,
 321                                     mapping);
 322         if (ret < 0)
 323                 kfree(mapping);
 324         else
 325                 list_add_tail(&mapping->obj_node, &etnaviv_obj->vram_list);
 326
 327 out:
 328         mutex_unlock(&etnaviv_obj->lock);
 329
 330         if (ret)
 331                 return ERR_PTR(ret);
 332
 333         /* Take a reference on the object */
 334         drm_gem_object_get(obj);
 335         return mapping;
 336 }
 337
 338 void *etnaviv_gem_vmap(struct drm_gem_object *obj)
 339 {
 340         struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
 341
 342         if (etnaviv_obj->vaddr)
 343                 return etnaviv_obj->vaddr;
 344
 345         mutex_lock(&etnaviv_obj->lock);
 346         /*
 347          * Need to check again, as we might have raced with another thread
 348          * while waiting for the mutex.
 349          */
 350         if (!etnaviv_obj->vaddr)
 351                 etnaviv_obj->vaddr = etnaviv_obj->ops->vmap(etnaviv_obj);
 352         mutex_unlock(&etnaviv_obj->lock);
 353
 354         return etnaviv_obj->vaddr;
 355 }
 356
 357 static void *etnaviv_gem_vmap_impl(struct etnaviv_gem_object *obj)
 358 {
 359         struct page **pages;
 360
 361         lockdep_assert_held(&obj->lock);
 362
 363         pages = etnaviv_gem_get_pages(obj);
 364         if (IS_ERR(pages))
 365                 return NULL;
 366
 367         return vmap(pages, obj->base.size >> PAGE_SHIFT,
 368                         VM_MAP, pgprot_writecombine(PAGE_KERNEL));
 369 }
 370
 371 static inline enum dma_data_direction etnaviv_op_to_dma_dir(u32 op)
 372 {
 373         if (op & ETNA_PREP_READ)
 374                 return DMA_FROM_DEVICE;
 375         else if (op & ETNA_PREP_WRITE)
 376                 return DMA_TO_DEVICE;
 377         else
 378                 return DMA_BIDIRECTIONAL;
 379 }
 380
 381 int etnaviv_gem_cpu_prep(struct drm_gem_object *obj, u32 op,
 382                 struct timespec *timeout)
 383 {
 384         struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
 385         struct drm_device *dev = obj->dev;
 386         bool write = !!(op & ETNA_PREP_WRITE);
 387         int ret;
 388
 389         if (!etnaviv_obj->sgt) {
 390                 void *ret;
 391
 392                 mutex_lock(&etnaviv_obj->lock);
 393                 ret = etnaviv_gem_get_pages(etnaviv_obj);
 394                 mutex_unlock(&etnaviv_obj->lock);
 395                 if (IS_ERR(ret))
 396                         return PTR_ERR(ret);
 397         }
 398
 399         if (op & ETNA_PREP_NOSYNC) {
 400                 if (!reservation_object_test_signaled_rcu(etnaviv_obj->resv,
 401                                                           write))
 402                         return -EBUSY;
 403         } else {
 404                 unsigned long remain = etnaviv_timeout_to_jiffies(timeout);
 405
 406                 ret = reservation_object_wait_timeout_rcu(etnaviv_obj->resv,
 407                                                           write, true, remain);
 408                 if (ret <= 0)
 409                         return ret == 0 ? -ETIMEDOUT : ret;
 410         }
 411
 412         if (etnaviv_obj->flags & ETNA_BO_CACHED) {
 413                 dma_sync_sg_for_cpu(dev->dev, etnaviv_obj->sgt->sgl,
 414                                     etnaviv_obj->sgt->nents,
 415                                     etnaviv_op_to_dma_dir(op));
 416                 etnaviv_obj->last_cpu_prep_op = op;
 417         }
 418
 419         return 0;
 420 }
 421
 422 int etnaviv_gem_cpu_fini(struct drm_gem_object *obj)
 423 {
 424         struct drm_device *dev = obj->dev;
 425         struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
 426
 427         if (etnaviv_obj->flags & ETNA_BO_CACHED) {
 428                 /* fini without a prep is almost certainly a userspace error */
 429                 WARN_ON(etnaviv_obj->last_cpu_prep_op == 0);
 430                 dma_sync_sg_for_device(dev->dev, etnaviv_obj->sgt->sgl,
 431                         etnaviv_obj->sgt->nents,
 432                         etnaviv_op_to_dma_dir(etnaviv_obj->last_cpu_prep_op));
 433                 etnaviv_obj->last_cpu_prep_op = 0;
 434         }
 435
 436         return 0;
 437 }
 438
 439 int etnaviv_gem_wait_bo(struct etnaviv_gpu *gpu, struct drm_gem_object *obj,
 440         struct timespec *timeout)
 441 {
 442         struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
 443
 444         return etnaviv_gpu_wait_obj_inactive(gpu, etnaviv_obj, timeout);
 445 }
 446
 447 #ifdef CONFIG_DEBUG_FS
 448 static void etnaviv_gem_describe_fence(struct dma_fence *fence,
 449         const char *type, struct seq_file *m)
 450 {
 451         if (!test_bit(DMA_FENCE_FLAG_SIGNALED_BIT, &fence->flags))
 452                 seq_printf(m, "\t%9s: %s %s seq %llu\n",
 453                            type,
 454                            fence->ops->get_driver_name(fence),
 455                            fence->ops->get_timeline_name(fence),
 456                            fence->seqno);
 457 }
 458
 459 static void etnaviv_gem_describe(struct drm_gem_object *obj, struct seq_file *m)
 460 {
 461         struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
 462         struct reservation_object *robj = etnaviv_obj->resv;
 463         struct reservation_object_list *fobj;
 464         struct dma_fence *fence;
 465         unsigned long off = drm_vma_node_start(&obj->vma_node);
 466
 467         seq_printf(m, "%08x: %c %2d (%2d) %08lx %p %zd\n",
 468                         etnaviv_obj->flags, is_active(etnaviv_obj) ? 'A' : 'I',
 469                         obj->name, kref_read(&obj->refcount),
 470                         off, etnaviv_obj->vaddr, obj->size);
 471
 472         rcu_read_lock();
 473         fobj = rcu_dereference(robj->fence);
 474         if (fobj) {
 475                 unsigned int i, shared_count = fobj->shared_count;
 476
 477                 for (i = 0; i < shared_count; i++) {
 478                         fence = rcu_dereference(fobj->shared[i]);
 479                         etnaviv_gem_describe_fence(fence, "Shared", m);
 480                 }
 481         }
 482
 483         fence = rcu_dereference(robj->fence_excl);
 484         if (fence)
 485                 etnaviv_gem_describe_fence(fence, "Exclusive", m);
 486         rcu_read_unlock();
 487 }
 488
 489 void etnaviv_gem_describe_objects(struct etnaviv_drm_private *priv,
 490         struct seq_file *m)
 491 {
 492         struct etnaviv_gem_object *etnaviv_obj;
 493         int count = 0;
 494         size_t size = 0;
 495
 496         mutex_lock(&priv->gem_lock);
 497         list_for_each_entry(etnaviv_obj, &priv->gem_list, gem_node) {
 498                 struct drm_gem_object *obj = &etnaviv_obj->base;
 499
 500                 seq_puts(m, "   ");
 501                 etnaviv_gem_describe(obj, m);
 502                 count++;
 503                 size += obj->size;
 504         }
 505         mutex_unlock(&priv->gem_lock);
 506
 507         seq_printf(m, "Total %d objects, %zu bytes\n", count, size);
 508 }
 509 #endif
 510
 511 static void etnaviv_gem_shmem_release(struct etnaviv_gem_object *etnaviv_obj)
 512 {
 513         vunmap(etnaviv_obj->vaddr);
 514         put_pages(etnaviv_obj);
 515 }
 516
 517 static const struct etnaviv_gem_ops etnaviv_gem_shmem_ops = {
 518         .get_pages = etnaviv_gem_shmem_get_pages,
 519         .release = etnaviv_gem_shmem_release,
 520         .vmap = etnaviv_gem_vmap_impl,
 521         .mmap = etnaviv_gem_mmap_obj,
 522 };
 523
 524 void etnaviv_gem_free_object(struct drm_gem_object *obj)
 525 {
 526         struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
 527         struct etnaviv_drm_private *priv = obj->dev->dev_private;
 528         struct etnaviv_vram_mapping *mapping, *tmp;
 529
 530         /* object should not be active */
 531         WARN_ON(is_active(etnaviv_obj));
 532
 533         mutex_lock(&priv->gem_lock);
 534         list_del(&etnaviv_obj->gem_node);
 535         mutex_unlock(&priv->gem_lock);
 536
 537         list_for_each_entry_safe(mapping, tmp, &etnaviv_obj->vram_list,
 538                                  obj_node) {
 539                 struct etnaviv_iommu *mmu = mapping->mmu;
 540
 541                 WARN_ON(mapping->use);
 542
 543                 if (mmu)
 544                         etnaviv_iommu_unmap_gem(mmu, mapping);
 545
 546                 list_del(&mapping->obj_node);
 547                 kfree(mapping);
 548         }
 549
 550         drm_gem_free_mmap_offset(obj);
 551         etnaviv_obj->ops->release(etnaviv_obj);
 552         if (etnaviv_obj->resv == &etnaviv_obj->_resv)
 553                 reservation_object_fini(&etnaviv_obj->_resv);
 554         drm_gem_object_release(obj);
 555
 556         kfree(etnaviv_obj);
 557 }
 558
 559 void etnaviv_gem_obj_add(struct drm_device *dev, struct drm_gem_object *obj)
 560 {
 561         struct etnaviv_drm_private *priv = dev->dev_private;
 562         struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
 563
 564         mutex_lock(&priv->gem_lock);
 565         list_add_tail(&etnaviv_obj->gem_node, &priv->gem_list);
 566         mutex_unlock(&priv->gem_lock);
 567 }
 568
 569 static int etnaviv_gem_new_impl(struct drm_device *dev, u32 size, u32 flags,
 570         struct reservation_object *robj, const struct etnaviv_gem_ops *ops,
 571         struct drm_gem_object **obj)
 572 {
 573         struct etnaviv_gem_object *etnaviv_obj;
 574         unsigned sz = sizeof(*etnaviv_obj);
 575         bool valid = true;
 576
 577         /* validate flags */
 578         switch (flags & ETNA_BO_CACHE_MASK) {
 579         case ETNA_BO_UNCACHED:
 580         case ETNA_BO_CACHED:
 581         case ETNA_BO_WC:
 582                 break;
 583         default:
 584                 valid = false;
 585         }
 586
 587         if (!valid) {
 588                 dev_err(dev->dev, "invalid cache flag: %x\n",
 589                         (flags & ETNA_BO_CACHE_MASK));
 590                 return -EINVAL;
 591         }
 592
 593         etnaviv_obj = kzalloc(sz, GFP_KERNEL);
 594         if (!etnaviv_obj)
 595                 return -ENOMEM;
 596
 597         etnaviv_obj->flags = flags;
 598         etnaviv_obj->ops = ops;
 599         if (robj) {
 600                 etnaviv_obj->resv = robj;
 601         } else {
 602                 etnaviv_obj->resv = &etnaviv_obj->_resv;
 603                 reservation_object_init(&etnaviv_obj->_resv);
 604         }
 605
 606         mutex_init(&etnaviv_obj->lock);
 607         INIT_LIST_HEAD(&etnaviv_obj->vram_list);
 608
 609         *obj = &etnaviv_obj->base;
 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 drm_gem_object *obj = NULL;
 619         int ret;
 620
 621         size = PAGE_ALIGN(size);
 622
 623         ret = etnaviv_gem_new_impl(dev, size, flags, NULL,
 624                                    &etnaviv_gem_shmem_ops, &obj);
 625         if (ret)
 626                 goto fail;
 627
 628         lockdep_set_class(&to_etnaviv_bo(obj)->lock, &etnaviv_shm_lock_class);
 629
 630         ret = drm_gem_object_init(dev, obj, size);
 631         if (ret == 0) {
 632                 struct address_space *mapping;
 633
 634                 /*
 635                  * Our buffers are kept pinned, so allocating them
 636                  * from the MOVABLE zone is a really bad idea, and
 637                  * conflicts with CMA. See comments above new_inode()
 638                  * why this is required _and_ expected if you're
 639                  * going to pin these pages.
 640                  */
 641                 mapping = obj->filp->f_mapping;
 642                 mapping_set_gfp_mask(mapping, GFP_HIGHUSER |
 643                                      __GFP_RETRY_MAYFAIL | __GFP_NOWARN);
 644         }
 645
 646         if (ret)
 647                 goto fail;
 648
 649         etnaviv_gem_obj_add(dev, obj);
 650
 651         ret = drm_gem_handle_create(file, obj, handle);
 652
 653         /* drop reference from allocate - handle holds it now */
 654 fail:
 655         drm_gem_object_put_unlocked(obj);
 656
 657         return ret;
 658 }
 659
 660 int etnaviv_gem_new_private(struct drm_device *dev, size_t size, u32 flags,
 661         struct reservation_object *robj, const struct etnaviv_gem_ops *ops,
 662         struct etnaviv_gem_object **res)
 663 {
 664         struct drm_gem_object *obj;
 665         int ret;
 666
 667         ret = etnaviv_gem_new_impl(dev, size, flags, robj, ops, &obj);
 668         if (ret)
 669                 return ret;
 670
 671         drm_gem_private_object_init(dev, obj, size);
 672
 673         *res = to_etnaviv_bo(obj);
 674
 675         return 0;
 676 }
 677
 678 static int etnaviv_gem_userptr_get_pages(struct etnaviv_gem_object *etnaviv_obj)
 679 {
 680         struct page **pvec = NULL;
 681         struct etnaviv_gem_userptr *userptr = &etnaviv_obj->userptr;
 682         int ret, pinned = 0, npages = etnaviv_obj->base.size >> PAGE_SHIFT;
 683
 684         might_lock_read(&current->mm->mmap_sem);
 685
 686         if (userptr->mm != current->mm)
 687                 return -EPERM;
 688
 689         pvec = kvmalloc_array(npages, sizeof(struct page *), GFP_KERNEL);
 690         if (!pvec)
 691                 return -ENOMEM;
 692
 693         do {
 694                 unsigned num_pages = npages - pinned;
 695                 uint64_t ptr = userptr->ptr + pinned * PAGE_SIZE;
 696                 struct page **pages = pvec + pinned;
 697
 698                 ret = get_user_pages_fast(ptr, num_pages,
 699                                           !userptr->ro ? FOLL_WRITE : 0, pages);
 700                 if (ret < 0) {
 701                         release_pages(pvec, pinned);
 702                         kvfree(pvec);
 703                         return ret;
 704                 }
 705
 706                 pinned += ret;
 707
 708         } while (pinned < npages);
 709
 710         etnaviv_obj->pages = pvec;
 711
 712         return 0;
 713 }
 714
 715 static void etnaviv_gem_userptr_release(struct etnaviv_gem_object *etnaviv_obj)
 716 {
 717         if (etnaviv_obj->sgt) {
 718                 etnaviv_gem_scatterlist_unmap(etnaviv_obj);
 719                 sg_free_table(etnaviv_obj->sgt);
 720                 kfree(etnaviv_obj->sgt);
 721         }
 722         if (etnaviv_obj->pages) {
 723                 int npages = etnaviv_obj->base.size >> PAGE_SHIFT;
 724
 725                 release_pages(etnaviv_obj->pages, npages);
 726                 kvfree(etnaviv_obj->pages);
 727         }
 728 }
 729
 730 static int etnaviv_gem_userptr_mmap_obj(struct etnaviv_gem_object *etnaviv_obj,
 731                 struct vm_area_struct *vma)
 732 {
 733         return -EINVAL;
 734 }
 735
 736 static const struct etnaviv_gem_ops etnaviv_gem_userptr_ops = {
 737         .get_pages = etnaviv_gem_userptr_get_pages,
 738         .release = etnaviv_gem_userptr_release,
 739         .vmap = etnaviv_gem_vmap_impl,
 740         .mmap = etnaviv_gem_userptr_mmap_obj,
 741 };
 742
 743 int etnaviv_gem_new_userptr(struct drm_device *dev, struct drm_file *file,
 744         uintptr_t ptr, u32 size, u32 flags, u32 *handle)
 745 {
 746         struct etnaviv_gem_object *etnaviv_obj;
 747         int ret;
 748
 749         ret = etnaviv_gem_new_private(dev, size, ETNA_BO_CACHED, NULL,
 750                                       &etnaviv_gem_userptr_ops, &etnaviv_obj);
 751         if (ret)
 752                 return ret;
 753
 754         lockdep_set_class(&etnaviv_obj->lock, &etnaviv_userptr_lock_class);
 755
 756         etnaviv_obj->userptr.ptr = ptr;
 757         etnaviv_obj->userptr.mm = current->mm;
 758         etnaviv_obj->userptr.ro = !(flags & ETNA_USERPTR_WRITE);
 759
 760         etnaviv_gem_obj_add(dev, &etnaviv_obj->base);
 761
 762         ret = drm_gem_handle_create(file, &etnaviv_obj->base, handle);
 763
 764         /* drop reference from allocate - handle holds it now */
 765         drm_gem_object_put_unlocked(&etnaviv_obj->base);
 766         return ret;
 767 }