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 #include <linux/sched/mm.h>
  20 #include <linux/sched/task.h>
  21
  22 #include "etnaviv_drv.h"
  23 #include "etnaviv_gem.h"
  24 #include "etnaviv_gpu.h"
  25 #include "etnaviv_mmu.h"
  26
  27 static void etnaviv_gem_scatter_map(struct etnaviv_gem_object *etnaviv_obj)
  28 {
  29         struct drm_device *dev = etnaviv_obj->base.dev;
  30         struct sg_table *sgt = etnaviv_obj->sgt;
  31
  32         /*
  33          * For non-cached buffers, ensure the new pages are clean
  34          * because display controller, GPU, etc. are not coherent.
  35          */
  36         if (etnaviv_obj->flags & ETNA_BO_CACHE_MASK)
  37                 dma_map_sg(dev->dev, sgt->sgl, sgt->nents, DMA_BIDIRECTIONAL);
  38 }
  39
  40 static void etnaviv_gem_scatterlist_unmap(struct etnaviv_gem_object *etnaviv_obj)
  41 {
  42         struct drm_device *dev = etnaviv_obj->base.dev;
  43         struct sg_table *sgt = etnaviv_obj->sgt;
  44
  45         /*
  46          * For non-cached buffers, ensure the new pages are clean
  47          * because display controller, GPU, etc. are not coherent:
  48          *
  49          * WARNING: The DMA API does not support concurrent CPU
  50          * and device access to the memory area.  With BIDIRECTIONAL,
  51          * we will clean the cache lines which overlap the region,
  52          * and invalidate all cache lines (partially) contained in
  53          * the region.
  54          *
  55          * If you have dirty data in the overlapping cache lines,
  56          * that will corrupt the GPU-written data.  If you have
  57          * written into the remainder of the region, this can
  58          * discard those writes.
  59          */
  60         if (etnaviv_obj->flags & ETNA_BO_CACHE_MASK)
  61                 dma_unmap_sg(dev->dev, sgt->sgl, sgt->nents, DMA_BIDIRECTIONAL);
  62 }
  63
  64 /* called with etnaviv_obj->lock held */
  65 static int etnaviv_gem_shmem_get_pages(struct etnaviv_gem_object *etnaviv_obj)
  66 {
  67         struct drm_device *dev = etnaviv_obj->base.dev;
  68         struct page **p = drm_gem_get_pages(&etnaviv_obj->base);
  69
  70         if (IS_ERR(p)) {
  71                 dev_dbg(dev->dev, "could not get pages: %ld\n", PTR_ERR(p));
  72                 return PTR_ERR(p);
  73         }
  74
  75         etnaviv_obj->pages = p;
  76
  77         return 0;
  78 }
  79
  80 static void put_pages(struct etnaviv_gem_object *etnaviv_obj)
  81 {
  82         if (etnaviv_obj->sgt) {
  83                 etnaviv_gem_scatterlist_unmap(etnaviv_obj);
  84                 sg_free_table(etnaviv_obj->sgt);
  85                 kfree(etnaviv_obj->sgt);
  86                 etnaviv_obj->sgt = NULL;
  87         }
  88         if (etnaviv_obj->pages) {
  89                 drm_gem_put_pages(&etnaviv_obj->base, etnaviv_obj->pages,
  90                                   true, false);
  91
  92                 etnaviv_obj->pages = NULL;
  93         }
  94 }
  95
  96 struct page **etnaviv_gem_get_pages(struct etnaviv_gem_object *etnaviv_obj)
  97 {
  98         int ret;
  99
 100         lockdep_assert_held(&etnaviv_obj->lock);
 101
 102         if (!etnaviv_obj->pages) {
 103                 ret = etnaviv_obj->ops->get_pages(etnaviv_obj);
 104                 if (ret < 0)
 105                         return ERR_PTR(ret);
 106         }
 107
 108         if (!etnaviv_obj->sgt) {
 109                 struct drm_device *dev = etnaviv_obj->base.dev;
 110                 int npages = etnaviv_obj->base.size >> PAGE_SHIFT;
 111                 struct sg_table *sgt;
 112
 113                 sgt = drm_prime_pages_to_sg(etnaviv_obj->pages, npages);
 114                 if (IS_ERR(sgt)) {
 115                         dev_err(dev->dev, "failed to allocate sgt: %ld\n",
 116                                 PTR_ERR(sgt));
 117                         return ERR_CAST(sgt);
 118                 }
 119
 120                 etnaviv_obj->sgt = sgt;
 121
 122                 etnaviv_gem_scatter_map(etnaviv_obj);
 123         }
 124
 125         return etnaviv_obj->pages;
 126 }
 127
 128 void etnaviv_gem_put_pages(struct etnaviv_gem_object *etnaviv_obj)
 129 {
 130         lockdep_assert_held(&etnaviv_obj->lock);
 131         /* when we start tracking the pin count, then do something here */
 132 }
 133
 134 static int etnaviv_gem_mmap_obj(struct etnaviv_gem_object *etnaviv_obj,
 135                 struct vm_area_struct *vma)
 136 {
 137         pgprot_t vm_page_prot;
 138
 139         vma->vm_flags &= ~VM_PFNMAP;
 140         vma->vm_flags |= VM_MIXEDMAP;
 141
 142         vm_page_prot = vm_get_page_prot(vma->vm_flags);
 143
 144         if (etnaviv_obj->flags & ETNA_BO_WC) {
 145                 vma->vm_page_prot = pgprot_writecombine(vm_page_prot);
 146         } else if (etnaviv_obj->flags & ETNA_BO_UNCACHED) {
 147                 vma->vm_page_prot = pgprot_noncached(vm_page_prot);
 148         } else {
 149                 /*
 150                  * Shunt off cached objs to shmem file so they have their own
 151                  * address_space (so unmap_mapping_range does what we want,
 152                  * in particular in the case of mmap'd dmabufs)
 153                  */
 154                 fput(vma->vm_file);
 155                 get_file(etnaviv_obj->base.filp);
 156                 vma->vm_pgoff = 0;
 157                 vma->vm_file  = etnaviv_obj->base.filp;
 158
 159                 vma->vm_page_prot = vm_page_prot;
 160         }
 161
 162         return 0;
 163 }
 164
 165 int etnaviv_gem_mmap(struct file *filp, struct vm_area_struct *vma)
 166 {
 167         struct etnaviv_gem_object *obj;
 168         int ret;
 169
 170         ret = drm_gem_mmap(filp, vma);
 171         if (ret) {
 172                 DBG("mmap failed: %d", ret);
 173                 return ret;
 174         }
 175
 176         obj = to_etnaviv_bo(vma->vm_private_data);
 177         return obj->ops->mmap(obj, vma);
 178 }
 179
 180 int etnaviv_gem_fault(struct vm_fault *vmf)
 181 {
 182         struct vm_area_struct *vma = vmf->vma;
 183         struct drm_gem_object *obj = vma->vm_private_data;
 184         struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
 185         struct page **pages, *page;
 186         pgoff_t pgoff;
 187         int ret;
 188
 189         /*
 190          * Make sure we don't parallel update on a fault, nor move or remove
 191          * something from beneath our feet.  Note that vm_insert_page() is
 192          * specifically coded to take care of this, so we don't have to.
 193          */
 194         ret = mutex_lock_interruptible(&etnaviv_obj->lock);
 195         if (ret)
 196                 goto out;
 197
 198         /* make sure we have pages attached now */
 199         pages = etnaviv_gem_get_pages(etnaviv_obj);
 200         mutex_unlock(&etnaviv_obj->lock);
 201
 202         if (IS_ERR(pages)) {
 203                 ret = PTR_ERR(pages);
 204                 goto out;
 205         }
 206
 207         /* We don't use vmf->pgoff since that has the fake offset: */
 208         pgoff = (vmf->address - vma->vm_start) >> PAGE_SHIFT;
 209
 210         page = pages[pgoff];
 211
 212         VERB("Inserting %p pfn %lx, pa %lx", (void *)vmf->address,
 213              page_to_pfn(page), page_to_pfn(page) << PAGE_SHIFT);
 214
 215         ret = vm_insert_page(vma, vmf->address, page);
 216
 217 out:
 218         switch (ret) {
 219         case -EAGAIN:
 220         case 0:
 221         case -ERESTARTSYS:
 222         case -EINTR:
 223         case -EBUSY:
 224                 /*
 225                  * EBUSY is ok: this just means that another thread
 226                  * already did the job.
 227                  */
 228                 return VM_FAULT_NOPAGE;
 229         case -ENOMEM:
 230                 return VM_FAULT_OOM;
 231         default:
 232                 return VM_FAULT_SIGBUS;
 233         }
 234 }
 235
 236 int etnaviv_gem_mmap_offset(struct drm_gem_object *obj, u64 *offset)
 237 {
 238         int ret;
 239
 240         /* Make it mmapable */
 241         ret = drm_gem_create_mmap_offset(obj);
 242         if (ret)
 243                 dev_err(obj->dev->dev, "could not allocate mmap offset\n");
 244         else
 245                 *offset = drm_vma_node_offset_addr(&obj->vma_node);
 246
 247         return ret;
 248 }
 249
 250 static struct etnaviv_vram_mapping *
 251 etnaviv_gem_get_vram_mapping(struct etnaviv_gem_object *obj,
 252                              struct etnaviv_iommu *mmu)
 253 {
 254         struct etnaviv_vram_mapping *mapping;
 255
 256         list_for_each_entry(mapping, &obj->vram_list, obj_node) {
 257                 if (mapping->mmu == mmu)
 258                         return mapping;
 259         }
 260
 261         return NULL;
 262 }
 263
 264 void etnaviv_gem_mapping_reference(struct etnaviv_vram_mapping *mapping)
 265 {
 266         struct etnaviv_gem_object *etnaviv_obj = mapping->object;
 267
 268         drm_gem_object_get(&etnaviv_obj->base);
 269
 270         mutex_lock(&etnaviv_obj->lock);
 271         WARN_ON(mapping->use == 0);
 272         mapping->use += 1;
 273         mutex_unlock(&etnaviv_obj->lock);
 274 }
 275
 276 void etnaviv_gem_mapping_unreference(struct etnaviv_vram_mapping *mapping)
 277 {
 278         struct etnaviv_gem_object *etnaviv_obj = mapping->object;
 279
 280         mutex_lock(&etnaviv_obj->lock);
 281         WARN_ON(mapping->use == 0);
 282         mapping->use -= 1;
 283         mutex_unlock(&etnaviv_obj->lock);
 284
 285         drm_gem_object_put_unlocked(&etnaviv_obj->base);
 286 }
 287
 288 struct etnaviv_vram_mapping *etnaviv_gem_mapping_get(
 289         struct drm_gem_object *obj, struct etnaviv_gpu *gpu)
 290 {
 291         struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
 292         struct etnaviv_vram_mapping *mapping;
 293         struct page **pages;
 294         int ret = 0;
 295
 296         mutex_lock(&etnaviv_obj->lock);
 297         mapping = etnaviv_gem_get_vram_mapping(etnaviv_obj, gpu->mmu);
 298         if (mapping) {
 299                 /*
 300                  * Holding the object lock prevents the use count changing
 301                  * beneath us.  If the use count is zero, the MMU might be
 302                  * reaping this object, so take the lock and re-check that
 303                  * the MMU owns this mapping to close this race.
 304                  */
 305                 if (mapping->use == 0) {
 306                         mutex_lock(&gpu->mmu->lock);
 307                         if (mapping->mmu == gpu->mmu)
 308                                 mapping->use += 1;
 309                         else
 310                                 mapping = NULL;
 311                         mutex_unlock(&gpu->mmu->lock);
 312                         if (mapping)
 313                                 goto out;
 314                 } else {
 315                         mapping->use += 1;
 316                         goto out;
 317                 }
 318         }
 319
 320         pages = etnaviv_gem_get_pages(etnaviv_obj);
 321         if (IS_ERR(pages)) {
 322                 ret = PTR_ERR(pages);
 323                 goto out;
 324         }
 325
 326         /*
 327          * See if we have a reaped vram mapping we can re-use before
 328          * allocating a fresh mapping.
 329          */
 330         mapping = etnaviv_gem_get_vram_mapping(etnaviv_obj, NULL);
 331         if (!mapping) {
 332                 mapping = kzalloc(sizeof(*mapping), GFP_KERNEL);
 333                 if (!mapping) {
 334                         ret = -ENOMEM;
 335                         goto out;
 336                 }
 337
 338                 INIT_LIST_HEAD(&mapping->scan_node);
 339                 mapping->object = etnaviv_obj;
 340         } else {
 341                 list_del(&mapping->obj_node);
 342         }
 343
 344         mapping->mmu = gpu->mmu;
 345         mapping->use = 1;
 346
 347         ret = etnaviv_iommu_map_gem(gpu->mmu, etnaviv_obj, gpu->memory_base,
 348                                     mapping);
 349         if (ret < 0)
 350                 kfree(mapping);
 351         else
 352                 list_add_tail(&mapping->obj_node, &etnaviv_obj->vram_list);
 353
 354 out:
 355         mutex_unlock(&etnaviv_obj->lock);
 356
 357         if (ret)
 358                 return ERR_PTR(ret);
 359
 360         /* Take a reference on the object */
 361         drm_gem_object_get(obj);
 362         return mapping;
 363 }
 364
 365 void *etnaviv_gem_vmap(struct drm_gem_object *obj)
 366 {
 367         struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
 368
 369         if (etnaviv_obj->vaddr)
 370                 return etnaviv_obj->vaddr;
 371
 372         mutex_lock(&etnaviv_obj->lock);
 373         /*
 374          * Need to check again, as we might have raced with another thread
 375          * while waiting for the mutex.
 376          */
 377         if (!etnaviv_obj->vaddr)
 378                 etnaviv_obj->vaddr = etnaviv_obj->ops->vmap(etnaviv_obj);
 379         mutex_unlock(&etnaviv_obj->lock);
 380
 381         return etnaviv_obj->vaddr;
 382 }
 383
 384 static void *etnaviv_gem_vmap_impl(struct etnaviv_gem_object *obj)
 385 {
 386         struct page **pages;
 387
 388         lockdep_assert_held(&obj->lock);
 389
 390         pages = etnaviv_gem_get_pages(obj);
 391         if (IS_ERR(pages))
 392                 return NULL;
 393
 394         return vmap(pages, obj->base.size >> PAGE_SHIFT,
 395                         VM_MAP, pgprot_writecombine(PAGE_KERNEL));
 396 }
 397
 398 static inline enum dma_data_direction etnaviv_op_to_dma_dir(u32 op)
 399 {
 400         if (op & ETNA_PREP_READ)
 401                 return DMA_FROM_DEVICE;
 402         else if (op & ETNA_PREP_WRITE)
 403                 return DMA_TO_DEVICE;
 404         else
 405                 return DMA_BIDIRECTIONAL;
 406 }
 407
 408 int etnaviv_gem_cpu_prep(struct drm_gem_object *obj, u32 op,
 409                 struct timespec *timeout)
 410 {
 411         struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
 412         struct drm_device *dev = obj->dev;
 413         bool write = !!(op & ETNA_PREP_WRITE);
 414         int ret;
 415
 416         if (!etnaviv_obj->sgt) {
 417                 void *ret;
 418
 419                 mutex_lock(&etnaviv_obj->lock);
 420                 ret = etnaviv_gem_get_pages(etnaviv_obj);
 421                 mutex_unlock(&etnaviv_obj->lock);
 422                 if (IS_ERR(ret))
 423                         return PTR_ERR(ret);
 424         }
 425
 426         if (op & ETNA_PREP_NOSYNC) {
 427                 if (!reservation_object_test_signaled_rcu(etnaviv_obj->resv,
 428                                                           write))
 429                         return -EBUSY;
 430         } else {
 431                 unsigned long remain = etnaviv_timeout_to_jiffies(timeout);
 432
 433                 ret = reservation_object_wait_timeout_rcu(etnaviv_obj->resv,
 434                                                           write, true, remain);
 435                 if (ret <= 0)
 436                         return ret == 0 ? -ETIMEDOUT : ret;
 437         }
 438
 439         if (etnaviv_obj->flags & ETNA_BO_CACHED) {
 440                 dma_sync_sg_for_cpu(dev->dev, etnaviv_obj->sgt->sgl,
 441                                     etnaviv_obj->sgt->nents,
 442                                     etnaviv_op_to_dma_dir(op));
 443                 etnaviv_obj->last_cpu_prep_op = op;
 444         }
 445
 446         return 0;
 447 }
 448
 449 int etnaviv_gem_cpu_fini(struct drm_gem_object *obj)
 450 {
 451         struct drm_device *dev = obj->dev;
 452         struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
 453
 454         if (etnaviv_obj->flags & ETNA_BO_CACHED) {
 455                 /* fini without a prep is almost certainly a userspace error */
 456                 WARN_ON(etnaviv_obj->last_cpu_prep_op == 0);
 457                 dma_sync_sg_for_device(dev->dev, etnaviv_obj->sgt->sgl,
 458                         etnaviv_obj->sgt->nents,
 459                         etnaviv_op_to_dma_dir(etnaviv_obj->last_cpu_prep_op));
 460                 etnaviv_obj->last_cpu_prep_op = 0;
 461         }
 462
 463         return 0;
 464 }
 465
 466 int etnaviv_gem_wait_bo(struct etnaviv_gpu *gpu, struct drm_gem_object *obj,
 467         struct timespec *timeout)
 468 {
 469         struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
 470
 471         return etnaviv_gpu_wait_obj_inactive(gpu, etnaviv_obj, timeout);
 472 }
 473
 474 #ifdef CONFIG_DEBUG_FS
 475 static void etnaviv_gem_describe_fence(struct dma_fence *fence,
 476         const char *type, struct seq_file *m)
 477 {
 478         if (!test_bit(DMA_FENCE_FLAG_SIGNALED_BIT, &fence->flags))
 479                 seq_printf(m, "\t%9s: %s %s seq %u\n",
 480                            type,
 481                            fence->ops->get_driver_name(fence),
 482                            fence->ops->get_timeline_name(fence),
 483                            fence->seqno);
 484 }
 485
 486 static void etnaviv_gem_describe(struct drm_gem_object *obj, struct seq_file *m)
 487 {
 488         struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
 489         struct reservation_object *robj = etnaviv_obj->resv;
 490         struct reservation_object_list *fobj;
 491         struct dma_fence *fence;
 492         unsigned long off = drm_vma_node_start(&obj->vma_node);
 493
 494         seq_printf(m, "%08x: %c %2d (%2d) %08lx %p %zd\n",
 495                         etnaviv_obj->flags, is_active(etnaviv_obj) ? 'A' : 'I',
 496                         obj->name, kref_read(&obj->refcount),
 497                         off, etnaviv_obj->vaddr, obj->size);
 498
 499         rcu_read_lock();
 500         fobj = rcu_dereference(robj->fence);
 501         if (fobj) {
 502                 unsigned int i, shared_count = fobj->shared_count;
 503
 504                 for (i = 0; i < shared_count; i++) {
 505                         fence = rcu_dereference(fobj->shared[i]);
 506                         etnaviv_gem_describe_fence(fence, "Shared", m);
 507                 }
 508         }
 509
 510         fence = rcu_dereference(robj->fence_excl);
 511         if (fence)
 512                 etnaviv_gem_describe_fence(fence, "Exclusive", m);
 513         rcu_read_unlock();
 514 }
 515
 516 void etnaviv_gem_describe_objects(struct etnaviv_drm_private *priv,
 517         struct seq_file *m)
 518 {
 519         struct etnaviv_gem_object *etnaviv_obj;
 520         int count = 0;
 521         size_t size = 0;
 522
 523         mutex_lock(&priv->gem_lock);
 524         list_for_each_entry(etnaviv_obj, &priv->gem_list, gem_node) {
 525                 struct drm_gem_object *obj = &etnaviv_obj->base;
 526
 527                 seq_puts(m, "   ");
 528                 etnaviv_gem_describe(obj, m);
 529                 count++;
 530                 size += obj->size;
 531         }
 532         mutex_unlock(&priv->gem_lock);
 533
 534         seq_printf(m, "Total %d objects, %zu bytes\n", count, size);
 535 }
 536 #endif
 537
 538 static void etnaviv_gem_shmem_release(struct etnaviv_gem_object *etnaviv_obj)
 539 {
 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         .mmap = etnaviv_gem_mmap_obj,
 549 };
 550
 551 void etnaviv_gem_free_object(struct drm_gem_object *obj)
 552 {
 553         struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
 554         struct etnaviv_drm_private *priv = obj->dev->dev_private;
 555         struct etnaviv_vram_mapping *mapping, *tmp;
 556
 557         /* object should not be active */
 558         WARN_ON(is_active(etnaviv_obj));
 559
 560         mutex_lock(&priv->gem_lock);
 561         list_del(&etnaviv_obj->gem_node);
 562         mutex_unlock(&priv->gem_lock);
 563
 564         list_for_each_entry_safe(mapping, tmp, &etnaviv_obj->vram_list,
 565                                  obj_node) {
 566                 struct etnaviv_iommu *mmu = mapping->mmu;
 567
 568                 WARN_ON(mapping->use);
 569
 570                 if (mmu)
 571                         etnaviv_iommu_unmap_gem(mmu, mapping);
 572
 573                 list_del(&mapping->obj_node);
 574                 kfree(mapping);
 575         }
 576
 577         drm_gem_free_mmap_offset(obj);
 578         etnaviv_obj->ops->release(etnaviv_obj);
 579         if (etnaviv_obj->resv == &etnaviv_obj->_resv)
 580                 reservation_object_fini(&etnaviv_obj->_resv);
 581         drm_gem_object_release(obj);
 582
 583         kfree(etnaviv_obj);
 584 }
 585
 586 int etnaviv_gem_obj_add(struct drm_device *dev, struct drm_gem_object *obj)
 587 {
 588         struct etnaviv_drm_private *priv = dev->dev_private;
 589         struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
 590
 591         mutex_lock(&priv->gem_lock);
 592         list_add_tail(&etnaviv_obj->gem_node, &priv->gem_list);
 593         mutex_unlock(&priv->gem_lock);
 594
 595         return 0;
 596 }
 597
 598 static int etnaviv_gem_new_impl(struct drm_device *dev, u32 size, u32 flags,
 599         struct reservation_object *robj, const struct etnaviv_gem_ops *ops,
 600         struct drm_gem_object **obj)
 601 {
 602         struct etnaviv_gem_object *etnaviv_obj;
 603         unsigned sz = sizeof(*etnaviv_obj);
 604         bool valid = true;
 605
 606         /* validate flags */
 607         switch (flags & ETNA_BO_CACHE_MASK) {
 608         case ETNA_BO_UNCACHED:
 609         case ETNA_BO_CACHED:
 610         case ETNA_BO_WC:
 611                 break;
 612         default:
 613                 valid = false;
 614         }
 615
 616         if (!valid) {
 617                 dev_err(dev->dev, "invalid cache flag: %x\n",
 618                         (flags & ETNA_BO_CACHE_MASK));
 619                 return -EINVAL;
 620         }
 621
 622         etnaviv_obj = kzalloc(sz, GFP_KERNEL);
 623         if (!etnaviv_obj)
 624                 return -ENOMEM;
 625
 626         etnaviv_obj->flags = flags;
 627         etnaviv_obj->ops = ops;
 628         if (robj) {
 629                 etnaviv_obj->resv = robj;
 630         } else {
 631                 etnaviv_obj->resv = &etnaviv_obj->_resv;
 632                 reservation_object_init(&etnaviv_obj->_resv);
 633         }
 634
 635         mutex_init(&etnaviv_obj->lock);
 636         INIT_LIST_HEAD(&etnaviv_obj->vram_list);
 637
 638         *obj = &etnaviv_obj->base;
 639
 640         return 0;
 641 }
 642
 643 static struct drm_gem_object *__etnaviv_gem_new(struct drm_device *dev,
 644                 u32 size, u32 flags)
 645 {
 646         struct drm_gem_object *obj = NULL;
 647         int ret;
 648
 649         size = PAGE_ALIGN(size);
 650
 651         ret = etnaviv_gem_new_impl(dev, size, flags, NULL,
 652                                    &etnaviv_gem_shmem_ops, &obj);
 653         if (ret)
 654                 goto fail;
 655
 656         ret = drm_gem_object_init(dev, obj, size);
 657         if (ret == 0) {
 658                 struct address_space *mapping;
 659
 660                 /*
 661                  * Our buffers are kept pinned, so allocating them
 662                  * from the MOVABLE zone is a really bad idea, and
 663                  * conflicts with CMA.  See coments above new_inode()
 664                  * why this is required _and_ expected if you're
 665                  * going to pin these pages.
 666                  */
 667                 mapping = obj->filp->f_mapping;
 668                 mapping_set_gfp_mask(mapping, GFP_HIGHUSER |
 669                                      __GFP_RETRY_MAYFAIL | __GFP_NOWARN);
 670         }
 671
 672         if (ret)
 673                 goto fail;
 674
 675         return obj;
 676
 677 fail:
 678         drm_gem_object_put_unlocked(obj);
 679         return ERR_PTR(ret);
 680 }
 681
 682 /* convenience method to construct a GEM buffer object, and userspace handle */
 683 int etnaviv_gem_new_handle(struct drm_device *dev, struct drm_file *file,
 684                 u32 size, u32 flags, u32 *handle)
 685 {
 686         struct drm_gem_object *obj;
 687         int ret;
 688
 689         obj = __etnaviv_gem_new(dev, size, flags);
 690         if (IS_ERR(obj))
 691                 return PTR_ERR(obj);
 692
 693         ret = etnaviv_gem_obj_add(dev, obj);
 694         if (ret < 0) {
 695                 drm_gem_object_put_unlocked(obj);
 696                 return ret;
 697         }
 698
 699         ret = drm_gem_handle_create(file, obj, handle);
 700
 701         /* drop reference from allocate - handle holds it now */
 702         drm_gem_object_put_unlocked(obj);
 703
 704         return ret;
 705 }
 706
 707 struct drm_gem_object *etnaviv_gem_new(struct drm_device *dev,
 708                 u32 size, u32 flags)
 709 {
 710         struct drm_gem_object *obj;
 711         int ret;
 712
 713         obj = __etnaviv_gem_new(dev, size, flags);
 714         if (IS_ERR(obj))
 715                 return obj;
 716
 717         ret = etnaviv_gem_obj_add(dev, obj);
 718         if (ret < 0) {
 719                 drm_gem_object_put_unlocked(obj);
 720                 return ERR_PTR(ret);
 721         }
 722
 723         return obj;
 724 }
 725
 726 int etnaviv_gem_new_private(struct drm_device *dev, size_t size, u32 flags,
 727         struct reservation_object *robj, const struct etnaviv_gem_ops *ops,
 728         struct etnaviv_gem_object **res)
 729 {
 730         struct drm_gem_object *obj;
 731         int ret;
 732
 733         ret = etnaviv_gem_new_impl(dev, size, flags, robj, ops, &obj);
 734         if (ret)
 735                 return ret;
 736
 737         drm_gem_private_object_init(dev, obj, size);
 738
 739         *res = to_etnaviv_bo(obj);
 740
 741         return 0;
 742 }
 743
 744 struct get_pages_work {
 745         struct work_struct work;
 746         struct mm_struct *mm;
 747         struct task_struct *task;
 748         struct etnaviv_gem_object *etnaviv_obj;
 749 };
 750
 751 static struct page **etnaviv_gem_userptr_do_get_pages(
 752         struct etnaviv_gem_object *etnaviv_obj, struct mm_struct *mm, struct task_struct *task)
 753 {
 754         int ret = 0, pinned, npages = etnaviv_obj->base.size >> PAGE_SHIFT;
 755         struct page **pvec;
 756         uintptr_t ptr;
 757         unsigned int flags = 0;
 758
 759         pvec = kvmalloc_array(npages, sizeof(struct page *), GFP_KERNEL);
 760         if (!pvec)
 761                 return ERR_PTR(-ENOMEM);
 762
 763         if (!etnaviv_obj->userptr.ro)
 764                 flags |= FOLL_WRITE;
 765
 766         pinned = 0;
 767         ptr = etnaviv_obj->userptr.ptr;
 768
 769         down_read(&mm->mmap_sem);
 770         while (pinned < npages) {
 771                 ret = get_user_pages_remote(task, mm, ptr, npages - pinned,
 772                                             flags, pvec + pinned, NULL, NULL);
 773                 if (ret < 0)
 774                         break;
 775
 776                 ptr += ret * PAGE_SIZE;
 777                 pinned += ret;
 778         }
 779         up_read(&mm->mmap_sem);
 780
 781         if (ret < 0) {
 782                 release_pages(pvec, pinned, 0);
 783                 kvfree(pvec);
 784                 return ERR_PTR(ret);
 785         }
 786
 787         return pvec;
 788 }
 789
 790 static void __etnaviv_gem_userptr_get_pages(struct work_struct *_work)
 791 {
 792         struct get_pages_work *work = container_of(_work, typeof(*work), work);
 793         struct etnaviv_gem_object *etnaviv_obj = work->etnaviv_obj;
 794         struct page **pvec;
 795
 796         pvec = etnaviv_gem_userptr_do_get_pages(etnaviv_obj, work->mm, work->task);
 797
 798         mutex_lock(&etnaviv_obj->lock);
 799         if (IS_ERR(pvec)) {
 800                 etnaviv_obj->userptr.work = ERR_CAST(pvec);
 801         } else {
 802                 etnaviv_obj->userptr.work = NULL;
 803                 etnaviv_obj->pages = pvec;
 804         }
 805
 806         mutex_unlock(&etnaviv_obj->lock);
 807         drm_gem_object_put_unlocked(&etnaviv_obj->base);
 808
 809         mmput(work->mm);
 810         put_task_struct(work->task);
 811         kfree(work);
 812 }
 813
 814 static int etnaviv_gem_userptr_get_pages(struct etnaviv_gem_object *etnaviv_obj)
 815 {
 816         struct page **pvec = NULL;
 817         struct get_pages_work *work;
 818         struct mm_struct *mm;
 819         int ret, pinned, npages = etnaviv_obj->base.size >> PAGE_SHIFT;
 820
 821         if (etnaviv_obj->userptr.work) {
 822                 if (IS_ERR(etnaviv_obj->userptr.work)) {
 823                         ret = PTR_ERR(etnaviv_obj->userptr.work);
 824                         etnaviv_obj->userptr.work = NULL;
 825                 } else {
 826                         ret = -EAGAIN;
 827                 }
 828                 return ret;
 829         }
 830
 831         mm = get_task_mm(etnaviv_obj->userptr.task);
 832         pinned = 0;
 833         if (mm == current->mm) {
 834                 pvec = kvmalloc_array(npages, sizeof(struct page *), GFP_KERNEL);
 835                 if (!pvec) {
 836                         mmput(mm);
 837                         return -ENOMEM;
 838                 }
 839
 840                 pinned = __get_user_pages_fast(etnaviv_obj->userptr.ptr, npages,
 841                                                !etnaviv_obj->userptr.ro, pvec);
 842                 if (pinned < 0) {
 843                         kvfree(pvec);
 844                         mmput(mm);
 845                         return pinned;
 846                 }
 847
 848                 if (pinned == npages) {
 849                         etnaviv_obj->pages = pvec;
 850                         mmput(mm);
 851                         return 0;
 852                 }
 853         }
 854
 855         release_pages(pvec, pinned, 0);
 856         kvfree(pvec);
 857
 858         work = kmalloc(sizeof(*work), GFP_KERNEL);
 859         if (!work) {
 860                 mmput(mm);
 861                 return -ENOMEM;
 862         }
 863
 864         get_task_struct(current);
 865         drm_gem_object_get(&etnaviv_obj->base);
 866
 867         work->mm = mm;
 868         work->task = current;
 869         work->etnaviv_obj = etnaviv_obj;
 870
 871         etnaviv_obj->userptr.work = &work->work;
 872         INIT_WORK(&work->work, __etnaviv_gem_userptr_get_pages);
 873
 874         etnaviv_queue_work(etnaviv_obj->base.dev, &work->work);
 875
 876         return -EAGAIN;
 877 }
 878
 879 static void etnaviv_gem_userptr_release(struct etnaviv_gem_object *etnaviv_obj)
 880 {
 881         if (etnaviv_obj->sgt) {
 882                 etnaviv_gem_scatterlist_unmap(etnaviv_obj);
 883                 sg_free_table(etnaviv_obj->sgt);
 884                 kfree(etnaviv_obj->sgt);
 885         }
 886         if (etnaviv_obj->pages) {
 887                 int npages = etnaviv_obj->base.size >> PAGE_SHIFT;
 888
 889                 release_pages(etnaviv_obj->pages, npages, 0);
 890                 kvfree(etnaviv_obj->pages);
 891         }
 892         put_task_struct(etnaviv_obj->userptr.task);
 893 }
 894
 895 static int etnaviv_gem_userptr_mmap_obj(struct etnaviv_gem_object *etnaviv_obj,
 896                 struct vm_area_struct *vma)
 897 {
 898         return -EINVAL;
 899 }
 900
 901 static const struct etnaviv_gem_ops etnaviv_gem_userptr_ops = {
 902         .get_pages = etnaviv_gem_userptr_get_pages,
 903         .release = etnaviv_gem_userptr_release,
 904         .vmap = etnaviv_gem_vmap_impl,
 905         .mmap = etnaviv_gem_userptr_mmap_obj,
 906 };
 907
 908 int etnaviv_gem_new_userptr(struct drm_device *dev, struct drm_file *file,
 909         uintptr_t ptr, u32 size, u32 flags, u32 *handle)
 910 {
 911         struct etnaviv_gem_object *etnaviv_obj;
 912         int ret;
 913
 914         ret = etnaviv_gem_new_private(dev, size, ETNA_BO_CACHED, NULL,
 915                                       &etnaviv_gem_userptr_ops, &etnaviv_obj);
 916         if (ret)
 917                 return ret;
 918
 919         etnaviv_obj->userptr.ptr = ptr;
 920         etnaviv_obj->userptr.task = current;
 921         etnaviv_obj->userptr.ro = !(flags & ETNA_USERPTR_WRITE);
 922         get_task_struct(current);
 923
 924         ret = etnaviv_gem_obj_add(dev, &etnaviv_obj->base);
 925         if (ret)
 926                 goto unreference;
 927
 928         ret = drm_gem_handle_create(file, &etnaviv_obj->base, handle);
 929 unreference:
 930         /* drop reference from allocate - handle holds it now */
 931         drm_gem_object_put_unlocked(&etnaviv_obj->base);
 932         return ret;
 933 }