drivers/gpu/drm/etnaviv/etnaviv_gem.c

   1 /*
   2  * Copyright (C) 2015 Etnaviv Project
   3  *
   4  * This program is free software; you can redistribute it and/or modify it
   5  * under the terms of the GNU General Public License version 2 as published by
   6  * the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope that it will be useful, but WITHOUT
   9  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  10  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  11  * more details.
  12  *
  13  * You should have received a copy of the GNU General Public License along with
  14  * this program.  If not, see <http://www.gnu.org/licenses/>.
  15  */
  16
  17 #include <linux/spinlock.h>
  18 #include <linux/shmem_fs.h>
  19
  20 #include "etnaviv_drv.h"
  21 #include "etnaviv_gem.h"
  22 #include "etnaviv_gpu.h"
  23 #include "etnaviv_mmu.h"
  24
  25 static void etnaviv_gem_scatter_map(struct etnaviv_gem_object *etnaviv_obj)
  26 {
  27         struct drm_device *dev = etnaviv_obj->base.dev;
  28         struct sg_table *sgt = etnaviv_obj->sgt;
  29
  30         /*
  31          * For non-cached buffers, ensure the new pages are clean
  32          * because display controller, GPU, etc. are not coherent.
  33          */
  34         if (etnaviv_obj->flags & ETNA_BO_CACHE_MASK)
  35                 dma_map_sg(dev->dev, sgt->sgl, sgt->nents, DMA_BIDIRECTIONAL);
  36 }
  37
  38 static void etnaviv_gem_scatterlist_unmap(struct etnaviv_gem_object *etnaviv_obj)
  39 {
  40         struct drm_device *dev = etnaviv_obj->base.dev;
  41         struct sg_table *sgt = etnaviv_obj->sgt;
  42
  43         /*
  44          * For non-cached buffers, ensure the new pages are clean
  45          * because display controller, GPU, etc. are not coherent:
  46          *
  47          * WARNING: The DMA API does not support concurrent CPU
  48          * and device access to the memory area.  With BIDIRECTIONAL,
  49          * we will clean the cache lines which overlap the region,
  50          * and invalidate all cache lines (partially) contained in
  51          * the region.
  52          *
  53          * If you have dirty data in the overlapping cache lines,
  54          * that will corrupt the GPU-written data.  If you have
  55          * written into the remainder of the region, this can
  56          * discard those writes.
  57          */
  58         if (etnaviv_obj->flags & ETNA_BO_CACHE_MASK)
  59                 dma_unmap_sg(dev->dev, sgt->sgl, sgt->nents, DMA_BIDIRECTIONAL);
  60 }
  61
  62 /* called with etnaviv_obj->lock held */
  63 static int etnaviv_gem_shmem_get_pages(struct etnaviv_gem_object *etnaviv_obj)
  64 {
  65         struct drm_device *dev = etnaviv_obj->base.dev;
  66         struct page **p = drm_gem_get_pages(&etnaviv_obj->base);
  67
  68         if (IS_ERR(p)) {
  69                 dev_err(dev->dev, "could not get pages: %ld\n", PTR_ERR(p));
  70                 return PTR_ERR(p);
  71         }
  72
  73         etnaviv_obj->pages = p;
  74
  75         return 0;
  76 }
  77
  78 static void put_pages(struct etnaviv_gem_object *etnaviv_obj)
  79 {
  80         if (etnaviv_obj->sgt) {
  81                 etnaviv_gem_scatterlist_unmap(etnaviv_obj);
  82                 sg_free_table(etnaviv_obj->sgt);
  83                 kfree(etnaviv_obj->sgt);
  84                 etnaviv_obj->sgt = NULL;
  85         }
  86         if (etnaviv_obj->pages) {
  87                 drm_gem_put_pages(&etnaviv_obj->base, etnaviv_obj->pages,
  88                                   true, false);
  89
  90                 etnaviv_obj->pages = NULL;
  91         }
  92 }
  93
  94 struct page **etnaviv_gem_get_pages(struct etnaviv_gem_object *etnaviv_obj)
  95 {
  96         int ret;
  97
  98         lockdep_assert_held(&etnaviv_obj->lock);
  99
 100         if (!etnaviv_obj->pages) {
 101                 ret = etnaviv_obj->ops->get_pages(etnaviv_obj);
 102                 if (ret < 0)
 103                         return ERR_PTR(ret);
 104         }
 105
 106         if (!etnaviv_obj->sgt) {
 107                 struct drm_device *dev = etnaviv_obj->base.dev;
 108                 int npages = etnaviv_obj->base.size >> PAGE_SHIFT;
 109                 struct sg_table *sgt;
 110
 111                 sgt = drm_prime_pages_to_sg(etnaviv_obj->pages, npages);
 112                 if (IS_ERR(sgt)) {
 113                         dev_err(dev->dev, "failed to allocate sgt: %ld\n",
 114                                 PTR_ERR(sgt));
 115                         return ERR_CAST(sgt);
 116                 }
 117
 118                 etnaviv_obj->sgt = sgt;
 119
 120                 etnaviv_gem_scatter_map(etnaviv_obj);
 121         }
 122
 123         return etnaviv_obj->pages;
 124 }
 125
 126 void etnaviv_gem_put_pages(struct etnaviv_gem_object *etnaviv_obj)
 127 {
 128         lockdep_assert_held(&etnaviv_obj->lock);
 129         /* when we start tracking the pin count, then do something here */
 130 }
 131
 132 static int etnaviv_gem_mmap_obj(struct drm_gem_object *obj,
 133                 struct vm_area_struct *vma)
 134 {
 135         struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
 136         pgprot_t vm_page_prot;
 137
 138         vma->vm_flags &= ~VM_PFNMAP;
 139         vma->vm_flags |= VM_MIXEDMAP;
 140
 141         vm_page_prot = vm_get_page_prot(vma->vm_flags);
 142
 143         if (etnaviv_obj->flags & ETNA_BO_WC) {
 144                 vma->vm_page_prot = pgprot_writecombine(vm_page_prot);
 145         } else if (etnaviv_obj->flags & ETNA_BO_UNCACHED) {
 146                 vma->vm_page_prot = pgprot_noncached(vm_page_prot);
 147         } else {
 148                 /*
 149                  * Shunt off cached objs to shmem file so they have their own
 150                  * address_space (so unmap_mapping_range does what we want,
 151                  * in particular in the case of mmap'd dmabufs)
 152                  */
 153                 fput(vma->vm_file);
 154                 get_file(obj->filp);
 155                 vma->vm_pgoff = 0;
 156                 vma->vm_file  = obj->filp;
 157
 158                 vma->vm_page_prot = vm_page_prot;
 159         }
 160
 161         return 0;
 162 }
 163
 164 int etnaviv_gem_mmap(struct file *filp, struct vm_area_struct *vma)
 165 {
 166         struct etnaviv_gem_object *obj;
 167         int ret;
 168
 169         ret = drm_gem_mmap(filp, vma);
 170         if (ret) {
 171                 DBG("mmap failed: %d", ret);
 172                 return ret;
 173         }
 174
 175         obj = to_etnaviv_bo(vma->vm_private_data);
 176         return etnaviv_gem_mmap_obj(vma->vm_private_data, vma);
 177 }
 178
 179 int etnaviv_gem_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
 180 {
 181         struct drm_gem_object *obj = vma->vm_private_data;
 182         struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
 183         struct page **pages, *page;
 184         pgoff_t pgoff;
 185         int ret;
 186
 187         /*
 188          * Make sure we don't parallel update on a fault, nor move or remove
 189          * something from beneath our feet.  Note that vm_insert_page() is
 190          * specifically coded to take care of this, so we don't have to.
 191          */
 192         ret = mutex_lock_interruptible(&etnaviv_obj->lock);
 193         if (ret)
 194                 goto out;
 195
 196         /* make sure we have pages attached now */
 197         pages = etnaviv_gem_get_pages(etnaviv_obj);
 198         mutex_unlock(&etnaviv_obj->lock);
 199
 200         if (IS_ERR(pages)) {
 201                 ret = PTR_ERR(pages);
 202                 goto out;
 203         }
 204
 205         /* We don't use vmf->pgoff since that has the fake offset: */
 206         pgoff = ((unsigned long)vmf->virtual_address -
 207                         vma->vm_start) >> PAGE_SHIFT;
 208
 209         page = pages[pgoff];
 210
 211         VERB("Inserting %p pfn %lx, pa %lx", vmf->virtual_address,
 212              page_to_pfn(page), page_to_pfn(page) << PAGE_SHIFT);
 213
 214         ret = vm_insert_page(vma, (unsigned long)vmf->virtual_address, page);
 215
 216 out:
 217         switch (ret) {
 218         case -EAGAIN:
 219         case 0:
 220         case -ERESTARTSYS:
 221         case -EINTR:
 222         case -EBUSY:
 223                 /*
 224                  * EBUSY is ok: this just means that another thread
 225                  * already did the job.
 226                  */
 227                 return VM_FAULT_NOPAGE;
 228         case -ENOMEM:
 229                 return VM_FAULT_OOM;
 230         default:
 231                 return VM_FAULT_SIGBUS;
 232         }
 233 }
 234
 235 int etnaviv_gem_mmap_offset(struct drm_gem_object *obj, u64 *offset)
 236 {
 237         int ret;
 238
 239         /* Make it mmapable */
 240         ret = drm_gem_create_mmap_offset(obj);
 241         if (ret)
 242                 dev_err(obj->dev->dev, "could not allocate mmap offset\n");
 243         else
 244                 *offset = drm_vma_node_offset_addr(&obj->vma_node);
 245
 246         return ret;
 247 }
 248
 249 static struct etnaviv_vram_mapping *
 250 etnaviv_gem_get_vram_mapping(struct etnaviv_gem_object *obj,
 251                              struct etnaviv_iommu *mmu)
 252 {
 253         struct etnaviv_vram_mapping *mapping;
 254
 255         list_for_each_entry(mapping, &obj->vram_list, obj_node) {
 256                 if (mapping->mmu == mmu)
 257                         return mapping;
 258         }
 259
 260         return NULL;
 261 }
 262
 263 int etnaviv_gem_get_iova(struct etnaviv_gpu *gpu,
 264         struct drm_gem_object *obj, u32 *iova)
 265 {
 266         struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
 267         struct etnaviv_vram_mapping *mapping;
 268         struct page **pages;
 269         int ret = 0;
 270
 271         mutex_lock(&etnaviv_obj->lock);
 272         mapping = etnaviv_gem_get_vram_mapping(etnaviv_obj, gpu->mmu);
 273         if (mapping) {
 274                 /*
 275                  * Holding the object lock prevents the use count changing
 276                  * beneath us.  If the use count is zero, the MMU might be
 277                  * reaping this object, so take the lock and re-check that
 278                  * the MMU owns this mapping to close this race.
 279                  */
 280                 if (mapping->use == 0) {
 281                         mutex_lock(&gpu->mmu->lock);
 282                         if (mapping->mmu == gpu->mmu)
 283                                 mapping->use += 1;
 284                         else
 285                                 mapping = NULL;
 286                         mutex_unlock(&gpu->mmu->lock);
 287                         if (mapping)
 288                                 goto out;
 289                 } else {
 290                         mapping->use += 1;
 291                         goto out;
 292                 }
 293         }
 294
 295         pages = etnaviv_gem_get_pages(etnaviv_obj);
 296         if (IS_ERR(pages)) {
 297                 ret = PTR_ERR(pages);
 298                 goto out;
 299         }
 300
 301         /*
 302          * See if we have a reaped vram mapping we can re-use before
 303          * allocating a fresh mapping.
 304          */
 305         mapping = etnaviv_gem_get_vram_mapping(etnaviv_obj, NULL);
 306         if (!mapping) {
 307                 mapping = kzalloc(sizeof(*mapping), GFP_KERNEL);
 308                 if (!mapping)
 309                         return -ENOMEM;
 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                 /* Take a reference on the object */
 332                 drm_gem_object_reference(obj);
 333                 *iova = mapping->iova;
 334         }
 335
 336         return ret;
 337 }
 338
 339 void etnaviv_gem_put_iova(struct etnaviv_gpu *gpu, struct drm_gem_object *obj)
 340 {
 341         struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
 342         struct etnaviv_vram_mapping *mapping;
 343
 344         mutex_lock(&etnaviv_obj->lock);
 345         mapping = etnaviv_gem_get_vram_mapping(etnaviv_obj, gpu->mmu);
 346
 347         WARN_ON(mapping->use == 0);
 348         mapping->use -= 1;
 349         mutex_unlock(&etnaviv_obj->lock);
 350
 351         drm_gem_object_unreference_unlocked(obj);
 352 }
 353
 354 void *etnaviv_gem_vaddr(struct drm_gem_object *obj)
 355 {
 356         struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
 357
 358         mutex_lock(&etnaviv_obj->lock);
 359         if (!etnaviv_obj->vaddr) {
 360                 struct page **pages = etnaviv_gem_get_pages(etnaviv_obj);
 361
 362                 if (IS_ERR(pages))
 363                         return ERR_CAST(pages);
 364
 365                 etnaviv_obj->vaddr = vmap(pages, obj->size >> PAGE_SHIFT,
 366                                 VM_MAP, pgprot_writecombine(PAGE_KERNEL));
 367         }
 368         mutex_unlock(&etnaviv_obj->lock);
 369
 370         return etnaviv_obj->vaddr;
 371 }
 372
 373 static inline enum dma_data_direction etnaviv_op_to_dma_dir(u32 op)
 374 {
 375         if (op & ETNA_PREP_READ)
 376                 return DMA_FROM_DEVICE;
 377         else if (op & ETNA_PREP_WRITE)
 378                 return DMA_TO_DEVICE;
 379         else
 380                 return DMA_BIDIRECTIONAL;
 381 }
 382
 383 int etnaviv_gem_cpu_prep(struct drm_gem_object *obj, u32 op,
 384                 struct timespec *timeout)
 385 {
 386         struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
 387         struct drm_device *dev = obj->dev;
 388         bool write = !!(op & ETNA_PREP_WRITE);
 389         int ret;
 390
 391         if (op & ETNA_PREP_NOSYNC) {
 392                 if (!reservation_object_test_signaled_rcu(etnaviv_obj->resv,
 393                                                           write))
 394                         return -EBUSY;
 395         } else {
 396                 unsigned long remain = etnaviv_timeout_to_jiffies(timeout);
 397
 398                 ret = reservation_object_wait_timeout_rcu(etnaviv_obj->resv,
 399                                                           write, true, remain);
 400                 if (ret <= 0)
 401                         return ret == 0 ? -ETIMEDOUT : ret;
 402         }
 403
 404         if (etnaviv_obj->flags & ETNA_BO_CACHED) {
 405                 if (!etnaviv_obj->sgt) {
 406                         void *ret;
 407
 408                         mutex_lock(&etnaviv_obj->lock);
 409                         ret = etnaviv_gem_get_pages(etnaviv_obj);
 410                         mutex_unlock(&etnaviv_obj->lock);
 411                         if (IS_ERR(ret))
 412                                 return PTR_ERR(ret);
 413                 }
 414
 415                 dma_sync_sg_for_cpu(dev->dev, etnaviv_obj->sgt->sgl,
 416                                     etnaviv_obj->sgt->nents,
 417                                     etnaviv_op_to_dma_dir(op));
 418                 etnaviv_obj->last_cpu_prep_op = op;
 419         }
 420
 421         return 0;
 422 }
 423
 424 int etnaviv_gem_cpu_fini(struct drm_gem_object *obj)
 425 {
 426         struct drm_device *dev = obj->dev;
 427         struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
 428
 429         if (etnaviv_obj->flags & ETNA_BO_CACHED) {
 430                 /* fini without a prep is almost certainly a userspace error */
 431                 WARN_ON(etnaviv_obj->last_cpu_prep_op == 0);
 432                 dma_sync_sg_for_device(dev->dev, etnaviv_obj->sgt->sgl,
 433                         etnaviv_obj->sgt->nents,
 434                         etnaviv_op_to_dma_dir(etnaviv_obj->last_cpu_prep_op));
 435                 etnaviv_obj->last_cpu_prep_op = 0;
 436         }
 437
 438         return 0;
 439 }
 440
 441 int etnaviv_gem_wait_bo(struct etnaviv_gpu *gpu, struct drm_gem_object *obj,
 442         struct timespec *timeout)
 443 {
 444         struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
 445
 446         return etnaviv_gpu_wait_obj_inactive(gpu, etnaviv_obj, timeout);
 447 }
 448
 449 #ifdef CONFIG_DEBUG_FS
 450 static void etnaviv_gem_describe_fence(struct fence *fence,
 451         const char *type, struct seq_file *m)
 452 {
 453         if (!test_bit(FENCE_FLAG_SIGNALED_BIT, &fence->flags))
 454                 seq_printf(m, "\t%9s: %s %s seq %u\n",
 455                            type,
 456                            fence->ops->get_driver_name(fence),
 457                            fence->ops->get_timeline_name(fence),
 458                            fence->seqno);
 459 }
 460
 461 static void etnaviv_gem_describe(struct drm_gem_object *obj, struct seq_file *m)
 462 {
 463         struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
 464         struct reservation_object *robj = etnaviv_obj->resv;
 465         struct reservation_object_list *fobj;
 466         struct fence *fence;
 467         unsigned long off = drm_vma_node_start(&obj->vma_node);
 468
 469         seq_printf(m, "%08x: %c %2d (%2d) %08lx %p %zd\n",
 470                         etnaviv_obj->flags, is_active(etnaviv_obj) ? 'A' : 'I',
 471                         obj->name, obj->refcount.refcount.counter,
 472                         off, etnaviv_obj->vaddr, obj->size);
 473
 474         rcu_read_lock();
 475         fobj = rcu_dereference(robj->fence);
 476         if (fobj) {
 477                 unsigned int i, shared_count = fobj->shared_count;
 478
 479                 for (i = 0; i < shared_count; i++) {
 480                         fence = rcu_dereference(fobj->shared[i]);
 481                         etnaviv_gem_describe_fence(fence, "Shared", m);
 482                 }
 483         }
 484
 485         fence = rcu_dereference(robj->fence_excl);
 486         if (fence)
 487                 etnaviv_gem_describe_fence(fence, "Exclusive", m);
 488         rcu_read_unlock();
 489 }
 490
 491 void etnaviv_gem_describe_objects(struct etnaviv_drm_private *priv,
 492         struct seq_file *m)
 493 {
 494         struct etnaviv_gem_object *etnaviv_obj;
 495         int count = 0;
 496         size_t size = 0;
 497
 498         mutex_lock(&priv->gem_lock);
 499         list_for_each_entry(etnaviv_obj, &priv->gem_list, gem_node) {
 500                 struct drm_gem_object *obj = &etnaviv_obj->base;
 501
 502                 seq_puts(m, "   ");
 503                 etnaviv_gem_describe(obj, m);
 504                 count++;
 505                 size += obj->size;
 506         }
 507         mutex_unlock(&priv->gem_lock);
 508
 509         seq_printf(m, "Total %d objects, %zu bytes\n", count, size);
 510 }
 511 #endif
 512
 513 static void etnaviv_gem_shmem_release(struct etnaviv_gem_object *etnaviv_obj)
 514 {
 515         if (etnaviv_obj->vaddr)
 516                 vunmap(etnaviv_obj->vaddr);
 517         put_pages(etnaviv_obj);
 518 }
 519
 520 static const struct etnaviv_gem_ops etnaviv_gem_shmem_ops = {
 521         .get_pages = etnaviv_gem_shmem_get_pages,
 522         .release = etnaviv_gem_shmem_release,
 523 };
 524
 525 void etnaviv_gem_free_object(struct drm_gem_object *obj)
 526 {
 527         struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
 528         struct etnaviv_vram_mapping *mapping, *tmp;
 529
 530         /* object should not be active */
 531         WARN_ON(is_active(etnaviv_obj));
 532
 533         list_del(&etnaviv_obj->gem_node);
 534
 535         list_for_each_entry_safe(mapping, tmp, &etnaviv_obj->vram_list,
 536                                  obj_node) {
 537                 struct etnaviv_iommu *mmu = mapping->mmu;
 538
 539                 WARN_ON(mapping->use);
 540
 541                 if (mmu)
 542                         etnaviv_iommu_unmap_gem(mmu, mapping);
 543
 544                 list_del(&mapping->obj_node);
 545                 kfree(mapping);
 546         }
 547
 548         drm_gem_free_mmap_offset(obj);
 549         etnaviv_obj->ops->release(etnaviv_obj);
 550         if (etnaviv_obj->resv == &etnaviv_obj->_resv)
 551                 reservation_object_fini(&etnaviv_obj->_resv);
 552         drm_gem_object_release(obj);
 553
 554         kfree(etnaviv_obj);
 555 }
 556
 557 int etnaviv_gem_obj_add(struct drm_device *dev, struct drm_gem_object *obj)
 558 {
 559         struct etnaviv_drm_private *priv = dev->dev_private;
 560         struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
 561
 562         mutex_lock(&priv->gem_lock);
 563         list_add_tail(&etnaviv_obj->gem_node, &priv->gem_list);
 564         mutex_unlock(&priv->gem_lock);
 565
 566         return 0;
 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 static struct drm_gem_object *__etnaviv_gem_new(struct drm_device *dev,
 615                 u32 size, u32 flags)
 616 {
 617         struct drm_gem_object *obj = NULL;
 618         int ret;
 619
 620         size = PAGE_ALIGN(size);
 621
 622         ret = etnaviv_gem_new_impl(dev, size, flags, NULL,
 623                                    &etnaviv_gem_shmem_ops, &obj);
 624         if (ret)
 625                 goto fail;
 626
 627         ret = drm_gem_object_init(dev, obj, size);
 628         if (ret == 0) {
 629                 struct address_space *mapping;
 630
 631                 /*
 632                  * Our buffers are kept pinned, so allocating them
 633                  * from the MOVABLE zone is a really bad idea, and
 634                  * conflicts with CMA.  See coments above new_inode()
 635                  * why this is required _and_ expected if you're
 636                  * going to pin these pages.
 637                  */
 638                 mapping = file_inode(obj->filp)->i_mapping;
 639                 mapping_set_gfp_mask(mapping, GFP_HIGHUSER);
 640         }
 641
 642         if (ret)
 643                 goto fail;
 644
 645         return obj;
 646
 647 fail:
 648         if (obj)
 649                 drm_gem_object_unreference_unlocked(obj);
 650
 651         return ERR_PTR(ret);
 652 }
 653
 654 /* convenience method to construct a GEM buffer object, and userspace handle */
 655 int etnaviv_gem_new_handle(struct drm_device *dev, struct drm_file *file,
 656                 u32 size, u32 flags, u32 *handle)
 657 {
 658         struct drm_gem_object *obj;
 659         int ret;
 660
 661         obj = __etnaviv_gem_new(dev, size, flags);
 662         if (IS_ERR(obj))
 663                 return PTR_ERR(obj);
 664
 665         ret = etnaviv_gem_obj_add(dev, obj);
 666         if (ret < 0) {
 667                 drm_gem_object_unreference_unlocked(obj);
 668                 return ret;
 669         }
 670
 671         ret = drm_gem_handle_create(file, obj, handle);
 672
 673         /* drop reference from allocate - handle holds it now */
 674         drm_gem_object_unreference_unlocked(obj);
 675
 676         return ret;
 677 }
 678
 679 struct drm_gem_object *etnaviv_gem_new(struct drm_device *dev,
 680                 u32 size, u32 flags)
 681 {
 682         struct drm_gem_object *obj;
 683         int ret;
 684
 685         obj = __etnaviv_gem_new(dev, size, flags);
 686         if (IS_ERR(obj))
 687                 return obj;
 688
 689         ret = etnaviv_gem_obj_add(dev, obj);
 690         if (ret < 0) {
 691                 drm_gem_object_unreference_unlocked(obj);
 692                 return ERR_PTR(ret);
 693         }
 694
 695         return obj;
 696 }
 697
 698 int etnaviv_gem_new_private(struct drm_device *dev, size_t size, u32 flags,
 699         struct reservation_object *robj, const struct etnaviv_gem_ops *ops,
 700         struct etnaviv_gem_object **res)
 701 {
 702         struct drm_gem_object *obj;
 703         int ret;
 704
 705         ret = etnaviv_gem_new_impl(dev, size, flags, robj, ops, &obj);
 706         if (ret)
 707                 return ret;
 708
 709         drm_gem_private_object_init(dev, obj, size);
 710
 711         *res = to_etnaviv_bo(obj);
 712
 713         return 0;
 714 }
 715
 716 struct get_pages_work {
 717         struct work_struct work;
 718         struct mm_struct *mm;
 719         struct task_struct *task;
 720         struct etnaviv_gem_object *etnaviv_obj;
 721 };
 722
 723 static struct page **etnaviv_gem_userptr_do_get_pages(
 724         struct etnaviv_gem_object *etnaviv_obj, struct mm_struct *mm, struct task_struct *task)
 725 {
 726         int ret = 0, pinned, npages = etnaviv_obj->base.size >> PAGE_SHIFT;
 727         struct page **pvec;
 728         uintptr_t ptr;
 729
 730         pvec = drm_malloc_ab(npages, sizeof(struct page *));
 731         if (!pvec)
 732                 return ERR_PTR(-ENOMEM);
 733
 734         pinned = 0;
 735         ptr = etnaviv_obj->userptr.ptr;
 736
 737         down_read(&mm->mmap_sem);
 738         while (pinned < npages) {
 739                 ret = get_user_pages(task, mm, ptr, npages - pinned,
 740                                      !etnaviv_obj->userptr.ro, 0,
 741                                      pvec + pinned, NULL);
 742                 if (ret < 0)
 743                         break;
 744
 745                 ptr += ret * PAGE_SIZE;
 746                 pinned += ret;
 747         }
 748         up_read(&mm->mmap_sem);
 749
 750         if (ret < 0) {
 751                 release_pages(pvec, pinned, 0);
 752                 drm_free_large(pvec);
 753                 return ERR_PTR(ret);
 754         }
 755
 756         return pvec;
 757 }
 758
 759 static void __etnaviv_gem_userptr_get_pages(struct work_struct *_work)
 760 {
 761         struct get_pages_work *work = container_of(_work, typeof(*work), work);
 762         struct etnaviv_gem_object *etnaviv_obj = work->etnaviv_obj;
 763         struct page **pvec;
 764
 765         pvec = etnaviv_gem_userptr_do_get_pages(etnaviv_obj, work->mm, work->task);
 766
 767         mutex_lock(&etnaviv_obj->lock);
 768         if (IS_ERR(pvec)) {
 769                 etnaviv_obj->userptr.work = ERR_CAST(pvec);
 770         } else {
 771                 etnaviv_obj->userptr.work = NULL;
 772                 etnaviv_obj->pages = pvec;
 773         }
 774
 775         mutex_unlock(&etnaviv_obj->lock);
 776         drm_gem_object_unreference_unlocked(&etnaviv_obj->base);
 777
 778         mmput(work->mm);
 779         put_task_struct(work->task);
 780         kfree(work);
 781 }
 782
 783 static int etnaviv_gem_userptr_get_pages(struct etnaviv_gem_object *etnaviv_obj)
 784 {
 785         struct page **pvec = NULL;
 786         struct get_pages_work *work;
 787         struct mm_struct *mm;
 788         int ret, pinned, npages = etnaviv_obj->base.size >> PAGE_SHIFT;
 789
 790         if (etnaviv_obj->userptr.work) {
 791                 if (IS_ERR(etnaviv_obj->userptr.work)) {
 792                         ret = PTR_ERR(etnaviv_obj->userptr.work);
 793                         etnaviv_obj->userptr.work = NULL;
 794                 } else {
 795                         ret = -EAGAIN;
 796                 }
 797                 return ret;
 798         }
 799
 800         mm = get_task_mm(etnaviv_obj->userptr.task);
 801         pinned = 0;
 802         if (mm == current->mm) {
 803                 pvec = drm_malloc_ab(npages, sizeof(struct page *));
 804                 if (!pvec) {
 805                         mmput(mm);
 806                         return -ENOMEM;
 807                 }
 808
 809                 pinned = __get_user_pages_fast(etnaviv_obj->userptr.ptr, npages,
 810                                                !etnaviv_obj->userptr.ro, pvec);
 811                 if (pinned < 0) {
 812                         drm_free_large(pvec);
 813                         mmput(mm);
 814                         return pinned;
 815                 }
 816
 817                 if (pinned == npages) {
 818                         etnaviv_obj->pages = pvec;
 819                         mmput(mm);
 820                         return 0;
 821                 }
 822         }
 823
 824         release_pages(pvec, pinned, 0);
 825         drm_free_large(pvec);
 826
 827         work = kmalloc(sizeof(*work), GFP_KERNEL);
 828         if (!work) {
 829                 mmput(mm);
 830                 return -ENOMEM;
 831         }
 832
 833         get_task_struct(current);
 834         drm_gem_object_reference(&etnaviv_obj->base);
 835
 836         work->mm = mm;
 837         work->task = current;
 838         work->etnaviv_obj = etnaviv_obj;
 839
 840         etnaviv_obj->userptr.work = &work->work;
 841         INIT_WORK(&work->work, __etnaviv_gem_userptr_get_pages);
 842
 843         etnaviv_queue_work(etnaviv_obj->base.dev, &work->work);
 844
 845         return -EAGAIN;
 846 }
 847
 848 static void etnaviv_gem_userptr_release(struct etnaviv_gem_object *etnaviv_obj)
 849 {
 850         if (etnaviv_obj->sgt) {
 851                 etnaviv_gem_scatterlist_unmap(etnaviv_obj);
 852                 sg_free_table(etnaviv_obj->sgt);
 853                 kfree(etnaviv_obj->sgt);
 854         }
 855         if (etnaviv_obj->pages) {
 856                 int npages = etnaviv_obj->base.size >> PAGE_SHIFT;
 857
 858                 release_pages(etnaviv_obj->pages, npages, 0);
 859                 drm_free_large(etnaviv_obj->pages);
 860         }
 861         put_task_struct(etnaviv_obj->userptr.task);
 862 }
 863
 864 static const struct etnaviv_gem_ops etnaviv_gem_userptr_ops = {
 865         .get_pages = etnaviv_gem_userptr_get_pages,
 866         .release = etnaviv_gem_userptr_release,
 867 };
 868
 869 int etnaviv_gem_new_userptr(struct drm_device *dev, struct drm_file *file,
 870         uintptr_t ptr, u32 size, u32 flags, u32 *handle)
 871 {
 872         struct etnaviv_gem_object *etnaviv_obj;
 873         int ret;
 874
 875         ret = etnaviv_gem_new_private(dev, size, ETNA_BO_CACHED, NULL,
 876                                       &etnaviv_gem_userptr_ops, &etnaviv_obj);
 877         if (ret)
 878                 return ret;
 879
 880         etnaviv_obj->userptr.ptr = ptr;
 881         etnaviv_obj->userptr.task = current;
 882         etnaviv_obj->userptr.ro = !(flags & ETNA_USERPTR_WRITE);
 883         get_task_struct(current);
 884
 885         ret = etnaviv_gem_obj_add(dev, &etnaviv_obj->base);
 886         if (ret) {
 887                 drm_gem_object_unreference_unlocked(&etnaviv_obj->base);
 888                 return ret;
 889         }
 890
 891         ret = drm_gem_handle_create(file, &etnaviv_obj->base, handle);
 892
 893         /* drop reference from allocate - handle holds it now */
 894         drm_gem_object_unreference_unlocked(&etnaviv_obj->base);
 895
 896         return ret;
 897 }