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 void etnaviv_gem_mapping_reference(struct etnaviv_vram_mapping *mapping)
 264 {
 265         struct etnaviv_gem_object *etnaviv_obj = mapping->object;
 266
 267         drm_gem_object_reference(&etnaviv_obj->base);
 268
 269         mutex_lock(&etnaviv_obj->lock);
 270         WARN_ON(mapping->use == 0);
 271         mapping->use += 1;
 272         mutex_unlock(&etnaviv_obj->lock);
 273 }
 274
 275 void etnaviv_gem_mapping_unreference(struct etnaviv_vram_mapping *mapping)
 276 {
 277         struct etnaviv_gem_object *etnaviv_obj = mapping->object;
 278
 279         mutex_lock(&etnaviv_obj->lock);
 280         WARN_ON(mapping->use == 0);
 281         mapping->use -= 1;
 282         mutex_unlock(&etnaviv_obj->lock);
 283
 284         drm_gem_object_unreference_unlocked(&etnaviv_obj->base);
 285 }
 286
 287 struct etnaviv_vram_mapping *etnaviv_gem_mapping_get(
 288         struct drm_gem_object *obj, struct etnaviv_gpu *gpu)
 289 {
 290         struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
 291         struct etnaviv_vram_mapping *mapping;
 292         struct page **pages;
 293         int ret = 0;
 294
 295         mutex_lock(&etnaviv_obj->lock);
 296         mapping = etnaviv_gem_get_vram_mapping(etnaviv_obj, gpu->mmu);
 297         if (mapping) {
 298                 /*
 299                  * Holding the object lock prevents the use count changing
 300                  * beneath us.  If the use count is zero, the MMU might be
 301                  * reaping this object, so take the lock and re-check that
 302                  * the MMU owns this mapping to close this race.
 303                  */
 304                 if (mapping->use == 0) {
 305                         mutex_lock(&gpu->mmu->lock);
 306                         if (mapping->mmu == gpu->mmu)
 307                                 mapping->use += 1;
 308                         else
 309                                 mapping = NULL;
 310                         mutex_unlock(&gpu->mmu->lock);
 311                         if (mapping)
 312                                 goto out;
 313                 } else {
 314                         mapping->use += 1;
 315                         goto out;
 316                 }
 317         }
 318
 319         pages = etnaviv_gem_get_pages(etnaviv_obj);
 320         if (IS_ERR(pages)) {
 321                 ret = PTR_ERR(pages);
 322                 goto out;
 323         }
 324
 325         /*
 326          * See if we have a reaped vram mapping we can re-use before
 327          * allocating a fresh mapping.
 328          */
 329         mapping = etnaviv_gem_get_vram_mapping(etnaviv_obj, NULL);
 330         if (!mapping) {
 331                 mapping = kzalloc(sizeof(*mapping), GFP_KERNEL);
 332                 if (!mapping) {
 333                         ret = -ENOMEM;
 334                         goto out;
 335                 }
 336
 337                 INIT_LIST_HEAD(&mapping->scan_node);
 338                 mapping->object = etnaviv_obj;
 339         } else {
 340                 list_del(&mapping->obj_node);
 341         }
 342
 343         mapping->mmu = gpu->mmu;
 344         mapping->use = 1;
 345
 346         ret = etnaviv_iommu_map_gem(gpu->mmu, etnaviv_obj, gpu->memory_base,
 347                                     mapping);
 348         if (ret < 0)
 349                 kfree(mapping);
 350         else
 351                 list_add_tail(&mapping->obj_node, &etnaviv_obj->vram_list);
 352
 353 out:
 354         mutex_unlock(&etnaviv_obj->lock);
 355
 356         if (ret)
 357                 return ERR_PTR(ret);
 358
 359         /* Take a reference on the object */
 360         drm_gem_object_reference(obj);
 361         return mapping;
 362 }
 363
 364 void *etnaviv_gem_vmap(struct drm_gem_object *obj)
 365 {
 366         struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
 367
 368         if (etnaviv_obj->vaddr)
 369                 return etnaviv_obj->vaddr;
 370
 371         mutex_lock(&etnaviv_obj->lock);
 372         /*
 373          * Need to check again, as we might have raced with another thread
 374          * while waiting for the mutex.
 375          */
 376         if (!etnaviv_obj->vaddr)
 377                 etnaviv_obj->vaddr = etnaviv_obj->ops->vmap(etnaviv_obj);
 378         mutex_unlock(&etnaviv_obj->lock);
 379
 380         return etnaviv_obj->vaddr;
 381 }
 382
 383 static void *etnaviv_gem_vmap_impl(struct etnaviv_gem_object *obj)
 384 {
 385         struct page **pages;
 386
 387         lockdep_assert_held(&obj->lock);
 388
 389         pages = etnaviv_gem_get_pages(obj);
 390         if (IS_ERR(pages))
 391                 return NULL;
 392
 393         return vmap(pages, obj->base.size >> PAGE_SHIFT,
 394                         VM_MAP, pgprot_writecombine(PAGE_KERNEL));
 395 }
 396
 397 static inline enum dma_data_direction etnaviv_op_to_dma_dir(u32 op)
 398 {
 399         if (op & ETNA_PREP_READ)
 400                 return DMA_FROM_DEVICE;
 401         else if (op & ETNA_PREP_WRITE)
 402                 return DMA_TO_DEVICE;
 403         else
 404                 return DMA_BIDIRECTIONAL;
 405 }
 406
 407 int etnaviv_gem_cpu_prep(struct drm_gem_object *obj, u32 op,
 408                 struct timespec *timeout)
 409 {
 410         struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
 411         struct drm_device *dev = obj->dev;
 412         bool write = !!(op & ETNA_PREP_WRITE);
 413         int ret;
 414
 415         if (op & ETNA_PREP_NOSYNC) {
 416                 if (!reservation_object_test_signaled_rcu(etnaviv_obj->resv,
 417                                                           write))
 418                         return -EBUSY;
 419         } else {
 420                 unsigned long remain = etnaviv_timeout_to_jiffies(timeout);
 421
 422                 ret = reservation_object_wait_timeout_rcu(etnaviv_obj->resv,
 423                                                           write, true, remain);
 424                 if (ret <= 0)
 425                         return ret == 0 ? -ETIMEDOUT : ret;
 426         }
 427
 428         if (etnaviv_obj->flags & ETNA_BO_CACHED) {
 429                 if (!etnaviv_obj->sgt) {
 430                         void *ret;
 431
 432                         mutex_lock(&etnaviv_obj->lock);
 433                         ret = etnaviv_gem_get_pages(etnaviv_obj);
 434                         mutex_unlock(&etnaviv_obj->lock);
 435                         if (IS_ERR(ret))
 436                                 return PTR_ERR(ret);
 437                 }
 438
 439                 dma_sync_sg_for_cpu(dev->dev, etnaviv_obj->sgt->sgl,
 440                                     etnaviv_obj->sgt->nents,
 441                                     etnaviv_op_to_dma_dir(op));
 442                 etnaviv_obj->last_cpu_prep_op = op;
 443         }
 444
 445         return 0;
 446 }
 447
 448 int etnaviv_gem_cpu_fini(struct drm_gem_object *obj)
 449 {
 450         struct drm_device *dev = obj->dev;
 451         struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
 452
 453         if (etnaviv_obj->flags & ETNA_BO_CACHED) {
 454                 /* fini without a prep is almost certainly a userspace error */
 455                 WARN_ON(etnaviv_obj->last_cpu_prep_op == 0);
 456                 dma_sync_sg_for_device(dev->dev, etnaviv_obj->sgt->sgl,
 457                         etnaviv_obj->sgt->nents,
 458                         etnaviv_op_to_dma_dir(etnaviv_obj->last_cpu_prep_op));
 459                 etnaviv_obj->last_cpu_prep_op = 0;
 460         }
 461
 462         return 0;
 463 }
 464
 465 int etnaviv_gem_wait_bo(struct etnaviv_gpu *gpu, struct drm_gem_object *obj,
 466         struct timespec *timeout)
 467 {
 468         struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
 469
 470         return etnaviv_gpu_wait_obj_inactive(gpu, etnaviv_obj, timeout);
 471 }
 472
 473 #ifdef CONFIG_DEBUG_FS
 474 static void etnaviv_gem_describe_fence(struct fence *fence,
 475         const char *type, struct seq_file *m)
 476 {
 477         if (!test_bit(FENCE_FLAG_SIGNALED_BIT, &fence->flags))
 478                 seq_printf(m, "\t%9s: %s %s seq %u\n",
 479                            type,
 480                            fence->ops->get_driver_name(fence),
 481                            fence->ops->get_timeline_name(fence),
 482                            fence->seqno);
 483 }
 484
 485 static void etnaviv_gem_describe(struct drm_gem_object *obj, struct seq_file *m)
 486 {
 487         struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
 488         struct reservation_object *robj = etnaviv_obj->resv;
 489         struct reservation_object_list *fobj;
 490         struct fence *fence;
 491         unsigned long off = drm_vma_node_start(&obj->vma_node);
 492
 493         seq_printf(m, "%08x: %c %2d (%2d) %08lx %p %zd\n",
 494                         etnaviv_obj->flags, is_active(etnaviv_obj) ? 'A' : 'I',
 495                         obj->name, obj->refcount.refcount.counter,
 496                         off, etnaviv_obj->vaddr, obj->size);
 497
 498         rcu_read_lock();
 499         fobj = rcu_dereference(robj->fence);
 500         if (fobj) {
 501                 unsigned int i, shared_count = fobj->shared_count;
 502
 503                 for (i = 0; i < shared_count; i++) {
 504                         fence = rcu_dereference(fobj->shared[i]);
 505                         etnaviv_gem_describe_fence(fence, "Shared", m);
 506                 }
 507         }
 508
 509         fence = rcu_dereference(robj->fence_excl);
 510         if (fence)
 511                 etnaviv_gem_describe_fence(fence, "Exclusive", m);
 512         rcu_read_unlock();
 513 }
 514
 515 void etnaviv_gem_describe_objects(struct etnaviv_drm_private *priv,
 516         struct seq_file *m)
 517 {
 518         struct etnaviv_gem_object *etnaviv_obj;
 519         int count = 0;
 520         size_t size = 0;
 521
 522         mutex_lock(&priv->gem_lock);
 523         list_for_each_entry(etnaviv_obj, &priv->gem_list, gem_node) {
 524                 struct drm_gem_object *obj = &etnaviv_obj->base;
 525
 526                 seq_puts(m, "   ");
 527                 etnaviv_gem_describe(obj, m);
 528                 count++;
 529                 size += obj->size;
 530         }
 531         mutex_unlock(&priv->gem_lock);
 532
 533         seq_printf(m, "Total %d objects, %zu bytes\n", count, size);
 534 }
 535 #endif
 536
 537 static void etnaviv_gem_shmem_release(struct etnaviv_gem_object *etnaviv_obj)
 538 {
 539         if (etnaviv_obj->vaddr)
 540                 vunmap(etnaviv_obj->vaddr);
 541         put_pages(etnaviv_obj);
 542 }
 543
 544 static const struct etnaviv_gem_ops etnaviv_gem_shmem_ops = {
 545         .get_pages = etnaviv_gem_shmem_get_pages,
 546         .release = etnaviv_gem_shmem_release,
 547         .vmap = etnaviv_gem_vmap_impl,
 548 };
 549
 550 void etnaviv_gem_free_object(struct drm_gem_object *obj)
 551 {
 552         struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
 553         struct etnaviv_vram_mapping *mapping, *tmp;
 554
 555         /* object should not be active */
 556         WARN_ON(is_active(etnaviv_obj));
 557
 558         list_del(&etnaviv_obj->gem_node);
 559
 560         list_for_each_entry_safe(mapping, tmp, &etnaviv_obj->vram_list,
 561                                  obj_node) {
 562                 struct etnaviv_iommu *mmu = mapping->mmu;
 563
 564                 WARN_ON(mapping->use);
 565
 566                 if (mmu)
 567                         etnaviv_iommu_unmap_gem(mmu, mapping);
 568
 569                 list_del(&mapping->obj_node);
 570                 kfree(mapping);
 571         }
 572
 573         drm_gem_free_mmap_offset(obj);
 574         etnaviv_obj->ops->release(etnaviv_obj);
 575         if (etnaviv_obj->resv == &etnaviv_obj->_resv)
 576                 reservation_object_fini(&etnaviv_obj->_resv);
 577         drm_gem_object_release(obj);
 578
 579         kfree(etnaviv_obj);
 580 }
 581
 582 int etnaviv_gem_obj_add(struct drm_device *dev, struct drm_gem_object *obj)
 583 {
 584         struct etnaviv_drm_private *priv = dev->dev_private;
 585         struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
 586
 587         mutex_lock(&priv->gem_lock);
 588         list_add_tail(&etnaviv_obj->gem_node, &priv->gem_list);
 589         mutex_unlock(&priv->gem_lock);
 590
 591         return 0;
 592 }
 593
 594 static int etnaviv_gem_new_impl(struct drm_device *dev, u32 size, u32 flags,
 595         struct reservation_object *robj, const struct etnaviv_gem_ops *ops,
 596         struct drm_gem_object **obj)
 597 {
 598         struct etnaviv_gem_object *etnaviv_obj;
 599         unsigned sz = sizeof(*etnaviv_obj);
 600         bool valid = true;
 601
 602         /* validate flags */
 603         switch (flags & ETNA_BO_CACHE_MASK) {
 604         case ETNA_BO_UNCACHED:
 605         case ETNA_BO_CACHED:
 606         case ETNA_BO_WC:
 607                 break;
 608         default:
 609                 valid = false;
 610         }
 611
 612         if (!valid) {
 613                 dev_err(dev->dev, "invalid cache flag: %x\n",
 614                         (flags & ETNA_BO_CACHE_MASK));
 615                 return -EINVAL;
 616         }
 617
 618         etnaviv_obj = kzalloc(sz, GFP_KERNEL);
 619         if (!etnaviv_obj)
 620                 return -ENOMEM;
 621
 622         etnaviv_obj->flags = flags;
 623         etnaviv_obj->ops = ops;
 624         if (robj) {
 625                 etnaviv_obj->resv = robj;
 626         } else {
 627                 etnaviv_obj->resv = &etnaviv_obj->_resv;
 628                 reservation_object_init(&etnaviv_obj->_resv);
 629         }
 630
 631         mutex_init(&etnaviv_obj->lock);
 632         INIT_LIST_HEAD(&etnaviv_obj->vram_list);
 633
 634         *obj = &etnaviv_obj->base;
 635
 636         return 0;
 637 }
 638
 639 static struct drm_gem_object *__etnaviv_gem_new(struct drm_device *dev,
 640                 u32 size, u32 flags)
 641 {
 642         struct drm_gem_object *obj = NULL;
 643         int ret;
 644
 645         size = PAGE_ALIGN(size);
 646
 647         ret = etnaviv_gem_new_impl(dev, size, flags, NULL,
 648                                    &etnaviv_gem_shmem_ops, &obj);
 649         if (ret)
 650                 goto fail;
 651
 652         ret = drm_gem_object_init(dev, obj, size);
 653         if (ret == 0) {
 654                 struct address_space *mapping;
 655
 656                 /*
 657                  * Our buffers are kept pinned, so allocating them
 658                  * from the MOVABLE zone is a really bad idea, and
 659                  * conflicts with CMA.  See coments above new_inode()
 660                  * why this is required _and_ expected if you're
 661                  * going to pin these pages.
 662                  */
 663                 mapping = file_inode(obj->filp)->i_mapping;
 664                 mapping_set_gfp_mask(mapping, GFP_HIGHUSER);
 665         }
 666
 667         if (ret)
 668                 goto fail;
 669
 670         return obj;
 671
 672 fail:
 673         if (obj)
 674                 drm_gem_object_unreference_unlocked(obj);
 675
 676         return ERR_PTR(ret);
 677 }
 678
 679 /* convenience method to construct a GEM buffer object, and userspace handle */
 680 int etnaviv_gem_new_handle(struct drm_device *dev, struct drm_file *file,
 681                 u32 size, u32 flags, u32 *handle)
 682 {
 683         struct drm_gem_object *obj;
 684         int ret;
 685
 686         obj = __etnaviv_gem_new(dev, size, flags);
 687         if (IS_ERR(obj))
 688                 return PTR_ERR(obj);
 689
 690         ret = etnaviv_gem_obj_add(dev, obj);
 691         if (ret < 0) {
 692                 drm_gem_object_unreference_unlocked(obj);
 693                 return ret;
 694         }
 695
 696         ret = drm_gem_handle_create(file, obj, handle);
 697
 698         /* drop reference from allocate - handle holds it now */
 699         drm_gem_object_unreference_unlocked(obj);
 700
 701         return ret;
 702 }
 703
 704 struct drm_gem_object *etnaviv_gem_new(struct drm_device *dev,
 705                 u32 size, u32 flags)
 706 {
 707         struct drm_gem_object *obj;
 708         int ret;
 709
 710         obj = __etnaviv_gem_new(dev, size, flags);
 711         if (IS_ERR(obj))
 712                 return obj;
 713
 714         ret = etnaviv_gem_obj_add(dev, obj);
 715         if (ret < 0) {
 716                 drm_gem_object_unreference_unlocked(obj);
 717                 return ERR_PTR(ret);
 718         }
 719
 720         return obj;
 721 }
 722
 723 int etnaviv_gem_new_private(struct drm_device *dev, size_t size, u32 flags,
 724         struct reservation_object *robj, const struct etnaviv_gem_ops *ops,
 725         struct etnaviv_gem_object **res)
 726 {
 727         struct drm_gem_object *obj;
 728         int ret;
 729
 730         ret = etnaviv_gem_new_impl(dev, size, flags, robj, ops, &obj);
 731         if (ret)
 732                 return ret;
 733
 734         drm_gem_private_object_init(dev, obj, size);
 735
 736         *res = to_etnaviv_bo(obj);
 737
 738         return 0;
 739 }
 740
 741 struct get_pages_work {
 742         struct work_struct work;
 743         struct mm_struct *mm;
 744         struct task_struct *task;
 745         struct etnaviv_gem_object *etnaviv_obj;
 746 };
 747
 748 static struct page **etnaviv_gem_userptr_do_get_pages(
 749         struct etnaviv_gem_object *etnaviv_obj, struct mm_struct *mm, struct task_struct *task)
 750 {
 751         int ret = 0, pinned, npages = etnaviv_obj->base.size >> PAGE_SHIFT;
 752         struct page **pvec;
 753         uintptr_t ptr;
 754
 755         pvec = drm_malloc_ab(npages, sizeof(struct page *));
 756         if (!pvec)
 757                 return ERR_PTR(-ENOMEM);
 758
 759         pinned = 0;
 760         ptr = etnaviv_obj->userptr.ptr;
 761
 762         down_read(&mm->mmap_sem);
 763         while (pinned < npages) {
 764                 ret = get_user_pages_remote(task, mm, ptr, npages - pinned,
 765                                             !etnaviv_obj->userptr.ro, 0,
 766                                             pvec + pinned, NULL);
 767                 if (ret < 0)
 768                         break;
 769
 770                 ptr += ret * PAGE_SIZE;
 771                 pinned += ret;
 772         }
 773         up_read(&mm->mmap_sem);
 774
 775         if (ret < 0) {
 776                 release_pages(pvec, pinned, 0);
 777                 drm_free_large(pvec);
 778                 return ERR_PTR(ret);
 779         }
 780
 781         return pvec;
 782 }
 783
 784 static void __etnaviv_gem_userptr_get_pages(struct work_struct *_work)
 785 {
 786         struct get_pages_work *work = container_of(_work, typeof(*work), work);
 787         struct etnaviv_gem_object *etnaviv_obj = work->etnaviv_obj;
 788         struct page **pvec;
 789
 790         pvec = etnaviv_gem_userptr_do_get_pages(etnaviv_obj, work->mm, work->task);
 791
 792         mutex_lock(&etnaviv_obj->lock);
 793         if (IS_ERR(pvec)) {
 794                 etnaviv_obj->userptr.work = ERR_CAST(pvec);
 795         } else {
 796                 etnaviv_obj->userptr.work = NULL;
 797                 etnaviv_obj->pages = pvec;
 798         }
 799
 800         mutex_unlock(&etnaviv_obj->lock);
 801         drm_gem_object_unreference_unlocked(&etnaviv_obj->base);
 802
 803         mmput(work->mm);
 804         put_task_struct(work->task);
 805         kfree(work);
 806 }
 807
 808 static int etnaviv_gem_userptr_get_pages(struct etnaviv_gem_object *etnaviv_obj)
 809 {
 810         struct page **pvec = NULL;
 811         struct get_pages_work *work;
 812         struct mm_struct *mm;
 813         int ret, pinned, npages = etnaviv_obj->base.size >> PAGE_SHIFT;
 814
 815         if (etnaviv_obj->userptr.work) {
 816                 if (IS_ERR(etnaviv_obj->userptr.work)) {
 817                         ret = PTR_ERR(etnaviv_obj->userptr.work);
 818                         etnaviv_obj->userptr.work = NULL;
 819                 } else {
 820                         ret = -EAGAIN;
 821                 }
 822                 return ret;
 823         }
 824
 825         mm = get_task_mm(etnaviv_obj->userptr.task);
 826         pinned = 0;
 827         if (mm == current->mm) {
 828                 pvec = drm_malloc_ab(npages, sizeof(struct page *));
 829                 if (!pvec) {
 830                         mmput(mm);
 831                         return -ENOMEM;
 832                 }
 833
 834                 pinned = __get_user_pages_fast(etnaviv_obj->userptr.ptr, npages,
 835                                                !etnaviv_obj->userptr.ro, pvec);
 836                 if (pinned < 0) {
 837                         drm_free_large(pvec);
 838                         mmput(mm);
 839                         return pinned;
 840                 }
 841
 842                 if (pinned == npages) {
 843                         etnaviv_obj->pages = pvec;
 844                         mmput(mm);
 845                         return 0;
 846                 }
 847         }
 848
 849         release_pages(pvec, pinned, 0);
 850         drm_free_large(pvec);
 851
 852         work = kmalloc(sizeof(*work), GFP_KERNEL);
 853         if (!work) {
 854                 mmput(mm);
 855                 return -ENOMEM;
 856         }
 857
 858         get_task_struct(current);
 859         drm_gem_object_reference(&etnaviv_obj->base);
 860
 861         work->mm = mm;
 862         work->task = current;
 863         work->etnaviv_obj = etnaviv_obj;
 864
 865         etnaviv_obj->userptr.work = &work->work;
 866         INIT_WORK(&work->work, __etnaviv_gem_userptr_get_pages);
 867
 868         etnaviv_queue_work(etnaviv_obj->base.dev, &work->work);
 869
 870         return -EAGAIN;
 871 }
 872
 873 static void etnaviv_gem_userptr_release(struct etnaviv_gem_object *etnaviv_obj)
 874 {
 875         if (etnaviv_obj->sgt) {
 876                 etnaviv_gem_scatterlist_unmap(etnaviv_obj);
 877                 sg_free_table(etnaviv_obj->sgt);
 878                 kfree(etnaviv_obj->sgt);
 879         }
 880         if (etnaviv_obj->pages) {
 881                 int npages = etnaviv_obj->base.size >> PAGE_SHIFT;
 882
 883                 release_pages(etnaviv_obj->pages, npages, 0);
 884                 drm_free_large(etnaviv_obj->pages);
 885         }
 886         put_task_struct(etnaviv_obj->userptr.task);
 887 }
 888
 889 static const struct etnaviv_gem_ops etnaviv_gem_userptr_ops = {
 890         .get_pages = etnaviv_gem_userptr_get_pages,
 891         .release = etnaviv_gem_userptr_release,
 892         .vmap = etnaviv_gem_vmap_impl,
 893 };
 894
 895 int etnaviv_gem_new_userptr(struct drm_device *dev, struct drm_file *file,
 896         uintptr_t ptr, u32 size, u32 flags, u32 *handle)
 897 {
 898         struct etnaviv_gem_object *etnaviv_obj;
 899         int ret;
 900
 901         ret = etnaviv_gem_new_private(dev, size, ETNA_BO_CACHED, NULL,
 902                                       &etnaviv_gem_userptr_ops, &etnaviv_obj);
 903         if (ret)
 904                 return ret;
 905
 906         etnaviv_obj->userptr.ptr = ptr;
 907         etnaviv_obj->userptr.task = current;
 908         etnaviv_obj->userptr.ro = !(flags & ETNA_USERPTR_WRITE);
 909         get_task_struct(current);
 910
 911         ret = etnaviv_gem_obj_add(dev, &etnaviv_obj->base);
 912         if (ret) {
 913                 drm_gem_object_unreference_unlocked(&etnaviv_obj->base);
 914                 return ret;
 915         }
 916
 917         ret = drm_gem_handle_create(file, &etnaviv_obj->base, handle);
 918
 919         /* drop reference from allocate - handle holds it now */
 920         drm_gem_object_unreference_unlocked(&etnaviv_obj->base);
 921
 922         return ret;
 923 }