drivers/gpu/drm/etnaviv/etnaviv_gem.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (C) 2015-2018 Etnaviv Project
   4  */
   5
   6 #include <drm/drm_prime.h>
   7 #include <linux/dma-mapping.h>
   8 #include <linux/shmem_fs.h>
   9 #include <linux/spinlock.h>
  10 #include <linux/vmalloc.h>
  11
  12 #include "etnaviv_drv.h"
  13 #include "etnaviv_gem.h"
  14 #include "etnaviv_gpu.h"
  15 #include "etnaviv_mmu.h"
  16
  17 static struct lock_class_key etnaviv_shm_lock_class;
  18 static struct lock_class_key etnaviv_userptr_lock_class;
  19
  20 static void etnaviv_gem_scatter_map(struct etnaviv_gem_object *etnaviv_obj)
  21 {
  22         struct drm_device *dev = etnaviv_obj->base.dev;
  23         struct sg_table *sgt = etnaviv_obj->sgt;
  24
  25         /*
  26          * For non-cached buffers, ensure the new pages are clean
  27          * because display controller, GPU, etc. are not coherent.
  28          */
  29         if (etnaviv_obj->flags & ETNA_BO_CACHE_MASK)
  30                 dma_map_sgtable(dev->dev, sgt, DMA_BIDIRECTIONAL, 0);
  31 }
  32
  33 static void etnaviv_gem_scatterlist_unmap(struct etnaviv_gem_object *etnaviv_obj)
  34 {
  35         struct drm_device *dev = etnaviv_obj->base.dev;
  36         struct sg_table *sgt = etnaviv_obj->sgt;
  37
  38         /*
  39          * For non-cached buffers, ensure the new pages are clean
  40          * because display controller, GPU, etc. are not coherent:
  41          *
  42          * WARNING: The DMA API does not support concurrent CPU
  43          * and device access to the memory area.  With BIDIRECTIONAL,
  44          * we will clean the cache lines which overlap the region,
  45          * and invalidate all cache lines (partially) contained in
  46          * the region.
  47          *
  48          * If you have dirty data in the overlapping cache lines,
  49          * that will corrupt the GPU-written data.  If you have
  50          * written into the remainder of the region, this can
  51          * discard those writes.
  52          */
  53         if (etnaviv_obj->flags & ETNA_BO_CACHE_MASK)
  54                 dma_unmap_sgtable(dev->dev, sgt, DMA_BIDIRECTIONAL, 0);
  55 }
  56
  57 /* called with etnaviv_obj->lock held */
  58 static int etnaviv_gem_shmem_get_pages(struct etnaviv_gem_object *etnaviv_obj)
  59 {
  60         struct drm_device *dev = etnaviv_obj->base.dev;
  61         struct page **p = drm_gem_get_pages(&etnaviv_obj->base);
  62
  63         if (IS_ERR(p)) {
  64                 dev_dbg(dev->dev, "could not get pages: %ld\n", PTR_ERR(p));
  65                 return PTR_ERR(p);
  66         }
  67
  68         etnaviv_obj->pages = p;
  69
  70         return 0;
  71 }
  72
  73 static void put_pages(struct etnaviv_gem_object *etnaviv_obj)
  74 {
  75         if (etnaviv_obj->sgt) {
  76                 etnaviv_gem_scatterlist_unmap(etnaviv_obj);
  77                 sg_free_table(etnaviv_obj->sgt);
  78                 kfree(etnaviv_obj->sgt);
  79                 etnaviv_obj->sgt = NULL;
  80         }
  81         if (etnaviv_obj->pages) {
  82                 drm_gem_put_pages(&etnaviv_obj->base, etnaviv_obj->pages,
  83                                   true, false);
  84
  85                 etnaviv_obj->pages = NULL;
  86         }
  87 }
  88
  89 struct page **etnaviv_gem_get_pages(struct etnaviv_gem_object *etnaviv_obj)
  90 {
  91         int ret;
  92
  93         lockdep_assert_held(&etnaviv_obj->lock);
  94
  95         if (!etnaviv_obj->pages) {
  96                 ret = etnaviv_obj->ops->get_pages(etnaviv_obj);
  97                 if (ret < 0)
  98                         return ERR_PTR(ret);
  99         }
 100
 101         if (!etnaviv_obj->sgt) {
 102                 struct drm_device *dev = etnaviv_obj->base.dev;
 103                 int npages = etnaviv_obj->base.size >> PAGE_SHIFT;
 104                 struct sg_table *sgt;
 105
 106                 sgt = drm_prime_pages_to_sg(etnaviv_obj->base.dev,
 107                                             etnaviv_obj->pages, npages);
 108                 if (IS_ERR(sgt)) {
 109                         dev_err(dev->dev, "failed to allocate sgt: %ld\n",
 110                                 PTR_ERR(sgt));
 111                         return ERR_CAST(sgt);
 112                 }
 113
 114                 etnaviv_obj->sgt = sgt;
 115
 116                 etnaviv_gem_scatter_map(etnaviv_obj);
 117         }
 118
 119         return etnaviv_obj->pages;
 120 }
 121
 122 void etnaviv_gem_put_pages(struct etnaviv_gem_object *etnaviv_obj)
 123 {
 124         lockdep_assert_held(&etnaviv_obj->lock);
 125         /* when we start tracking the pin count, then do something here */
 126 }
 127
 128 static int etnaviv_gem_mmap_obj(struct etnaviv_gem_object *etnaviv_obj,
 129                 struct vm_area_struct *vma)
 130 {
 131         pgprot_t vm_page_prot;
 132
 133         vma->vm_flags &= ~VM_PFNMAP;
 134         vma->vm_flags |= VM_MIXEDMAP;
 135
 136         vm_page_prot = vm_get_page_prot(vma->vm_flags);
 137
 138         if (etnaviv_obj->flags & ETNA_BO_WC) {
 139                 vma->vm_page_prot = pgprot_writecombine(vm_page_prot);
 140         } else if (etnaviv_obj->flags & ETNA_BO_UNCACHED) {
 141                 vma->vm_page_prot = pgprot_noncached(vm_page_prot);
 142         } else {
 143                 /*
 144                  * Shunt off cached objs to shmem file so they have their own
 145                  * address_space (so unmap_mapping_range does what we want,
 146                  * in particular in the case of mmap'd dmabufs)
 147                  */
 148                 fput(vma->vm_file);
 149                 get_file(etnaviv_obj->base.filp);
 150                 vma->vm_pgoff = 0;
 151                 vma->vm_file  = etnaviv_obj->base.filp;
 152
 153                 vma->vm_page_prot = vm_page_prot;
 154         }
 155
 156         return 0;
 157 }
 158
 159 int etnaviv_gem_mmap(struct file *filp, struct vm_area_struct *vma)
 160 {
 161         struct etnaviv_gem_object *obj;
 162         int ret;
 163
 164         ret = drm_gem_mmap(filp, vma);
 165         if (ret) {
 166                 DBG("mmap failed: %d", ret);
 167                 return ret;
 168         }
 169
 170         obj = to_etnaviv_bo(vma->vm_private_data);
 171         return obj->ops->mmap(obj, vma);
 172 }
 173
 174 static vm_fault_t etnaviv_gem_fault(struct vm_fault *vmf)
 175 {
 176         struct vm_area_struct *vma = vmf->vma;
 177         struct drm_gem_object *obj = vma->vm_private_data;
 178         struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
 179         struct page **pages, *page;
 180         pgoff_t pgoff;
 181         int err;
 182
 183         /*
 184          * Make sure we don't parallel update on a fault, nor move or remove
 185          * something from beneath our feet.  Note that vmf_insert_page() is
 186          * specifically coded to take care of this, so we don't have to.
 187          */
 188         err = mutex_lock_interruptible(&etnaviv_obj->lock);
 189         if (err)
 190                 return VM_FAULT_NOPAGE;
 191         /* make sure we have pages attached now */
 192         pages = etnaviv_gem_get_pages(etnaviv_obj);
 193         mutex_unlock(&etnaviv_obj->lock);
 194
 195         if (IS_ERR(pages)) {
 196                 err = PTR_ERR(pages);
 197                 return vmf_error(err);
 198         }
 199
 200         /* We don't use vmf->pgoff since that has the fake offset: */
 201         pgoff = (vmf->address - vma->vm_start) >> PAGE_SHIFT;
 202
 203         page = pages[pgoff];
 204
 205         VERB("Inserting %p pfn %lx, pa %lx", (void *)vmf->address,
 206              page_to_pfn(page), page_to_pfn(page) << PAGE_SHIFT);
 207
 208         return vmf_insert_page(vma, vmf->address, page);
 209 }
 210
 211 int etnaviv_gem_mmap_offset(struct drm_gem_object *obj, u64 *offset)
 212 {
 213         int ret;
 214
 215         /* Make it mmapable */
 216         ret = drm_gem_create_mmap_offset(obj);
 217         if (ret)
 218                 dev_err(obj->dev->dev, "could not allocate mmap offset\n");
 219         else
 220                 *offset = drm_vma_node_offset_addr(&obj->vma_node);
 221
 222         return ret;
 223 }
 224
 225 static struct etnaviv_vram_mapping *
 226 etnaviv_gem_get_vram_mapping(struct etnaviv_gem_object *obj,
 227                              struct etnaviv_iommu_context *context)
 228 {
 229         struct etnaviv_vram_mapping *mapping;
 230
 231         list_for_each_entry(mapping, &obj->vram_list, obj_node) {
 232                 if (mapping->context == context)
 233                         return mapping;
 234         }
 235
 236         return NULL;
 237 }
 238
 239 void etnaviv_gem_mapping_unreference(struct etnaviv_vram_mapping *mapping)
 240 {
 241         struct etnaviv_gem_object *etnaviv_obj = mapping->object;
 242
 243         mutex_lock(&etnaviv_obj->lock);
 244         WARN_ON(mapping->use == 0);
 245         mapping->use -= 1;
 246         mutex_unlock(&etnaviv_obj->lock);
 247
 248         drm_gem_object_put(&etnaviv_obj->base);
 249 }
 250
 251 struct etnaviv_vram_mapping *etnaviv_gem_mapping_get(
 252         struct drm_gem_object *obj, struct etnaviv_iommu_context *mmu_context,
 253         u64 va)
 254 {
 255         struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
 256         struct etnaviv_vram_mapping *mapping;
 257         struct page **pages;
 258         int ret = 0;
 259
 260         mutex_lock(&etnaviv_obj->lock);
 261         mapping = etnaviv_gem_get_vram_mapping(etnaviv_obj, mmu_context);
 262         if (mapping) {
 263                 /*
 264                  * Holding the object lock prevents the use count changing
 265                  * beneath us.  If the use count is zero, the MMU might be
 266                  * reaping this object, so take the lock and re-check that
 267                  * the MMU owns this mapping to close this race.
 268                  */
 269                 if (mapping->use == 0) {
 270                         mutex_lock(&mmu_context->lock);
 271                         if (mapping->context == mmu_context)
 272                                 mapping->use += 1;
 273                         else
 274                                 mapping = NULL;
 275                         mutex_unlock(&mmu_context->lock);
 276                         if (mapping)
 277                                 goto out;
 278                 } else {
 279                         mapping->use += 1;
 280                         goto out;
 281                 }
 282         }
 283
 284         pages = etnaviv_gem_get_pages(etnaviv_obj);
 285         if (IS_ERR(pages)) {
 286                 ret = PTR_ERR(pages);
 287                 goto out;
 288         }
 289
 290         /*
 291          * See if we have a reaped vram mapping we can re-use before
 292          * allocating a fresh mapping.
 293          */
 294         mapping = etnaviv_gem_get_vram_mapping(etnaviv_obj, NULL);
 295         if (!mapping) {
 296                 mapping = kzalloc(sizeof(*mapping), GFP_KERNEL);
 297                 if (!mapping) {
 298                         ret = -ENOMEM;
 299                         goto out;
 300                 }
 301
 302                 INIT_LIST_HEAD(&mapping->scan_node);
 303                 mapping->object = etnaviv_obj;
 304         } else {
 305                 list_del(&mapping->obj_node);
 306         }
 307
 308         etnaviv_iommu_context_get(mmu_context);
 309         mapping->context = mmu_context;
 310         mapping->use = 1;
 311
 312         ret = etnaviv_iommu_map_gem(mmu_context, etnaviv_obj,
 313                                     mmu_context->global->memory_base,
 314                                     mapping, va);
 315         if (ret < 0) {
 316                 etnaviv_iommu_context_put(mmu_context);
 317                 kfree(mapping);
 318         } else {
 319                 list_add_tail(&mapping->obj_node, &etnaviv_obj->vram_list);
 320         }
 321
 322 out:
 323         mutex_unlock(&etnaviv_obj->lock);
 324
 325         if (ret)
 326                 return ERR_PTR(ret);
 327
 328         /* Take a reference on the object */
 329         drm_gem_object_get(obj);
 330         return mapping;
 331 }
 332
 333 void *etnaviv_gem_vmap(struct drm_gem_object *obj)
 334 {
 335         struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
 336
 337         if (etnaviv_obj->vaddr)
 338                 return etnaviv_obj->vaddr;
 339
 340         mutex_lock(&etnaviv_obj->lock);
 341         /*
 342          * Need to check again, as we might have raced with another thread
 343          * while waiting for the mutex.
 344          */
 345         if (!etnaviv_obj->vaddr)
 346                 etnaviv_obj->vaddr = etnaviv_obj->ops->vmap(etnaviv_obj);
 347         mutex_unlock(&etnaviv_obj->lock);
 348
 349         return etnaviv_obj->vaddr;
 350 }
 351
 352 static void *etnaviv_gem_vmap_impl(struct etnaviv_gem_object *obj)
 353 {
 354         struct page **pages;
 355
 356         lockdep_assert_held(&obj->lock);
 357
 358         pages = etnaviv_gem_get_pages(obj);
 359         if (IS_ERR(pages))
 360                 return NULL;
 361
 362         return vmap(pages, obj->base.size >> PAGE_SHIFT,
 363                         VM_MAP, pgprot_writecombine(PAGE_KERNEL));
 364 }
 365
 366 static inline enum dma_data_direction etnaviv_op_to_dma_dir(u32 op)
 367 {
 368         if (op & ETNA_PREP_READ)
 369                 return DMA_FROM_DEVICE;
 370         else if (op & ETNA_PREP_WRITE)
 371                 return DMA_TO_DEVICE;
 372         else
 373                 return DMA_BIDIRECTIONAL;
 374 }
 375
 376 int etnaviv_gem_cpu_prep(struct drm_gem_object *obj, u32 op,
 377                 struct drm_etnaviv_timespec *timeout)
 378 {
 379         struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
 380         struct drm_device *dev = obj->dev;
 381         bool write = !!(op & ETNA_PREP_WRITE);
 382         int ret;
 383
 384         if (!etnaviv_obj->sgt) {
 385                 void *ret;
 386
 387                 mutex_lock(&etnaviv_obj->lock);
 388                 ret = etnaviv_gem_get_pages(etnaviv_obj);
 389                 mutex_unlock(&etnaviv_obj->lock);
 390                 if (IS_ERR(ret))
 391                         return PTR_ERR(ret);
 392         }
 393
 394         if (op & ETNA_PREP_NOSYNC) {
 395                 if (!dma_resv_test_signaled_rcu(obj->resv,
 396                                                           write))
 397                         return -EBUSY;
 398         } else {
 399                 unsigned long remain = etnaviv_timeout_to_jiffies(timeout);
 400
 401                 ret = dma_resv_wait_timeout_rcu(obj->resv,
 402                                                           write, true, remain);
 403                 if (ret <= 0)
 404                         return ret == 0 ? -ETIMEDOUT : ret;
 405         }
 406
 407         if (etnaviv_obj->flags & ETNA_BO_CACHED) {
 408                 dma_sync_sgtable_for_cpu(dev->dev, etnaviv_obj->sgt,
 409                                          etnaviv_op_to_dma_dir(op));
 410                 etnaviv_obj->last_cpu_prep_op = op;
 411         }
 412
 413         return 0;
 414 }
 415
 416 int etnaviv_gem_cpu_fini(struct drm_gem_object *obj)
 417 {
 418         struct drm_device *dev = obj->dev;
 419         struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
 420
 421         if (etnaviv_obj->flags & ETNA_BO_CACHED) {
 422                 /* fini without a prep is almost certainly a userspace error */
 423                 WARN_ON(etnaviv_obj->last_cpu_prep_op == 0);
 424                 dma_sync_sgtable_for_device(dev->dev, etnaviv_obj->sgt,
 425                         etnaviv_op_to_dma_dir(etnaviv_obj->last_cpu_prep_op));
 426                 etnaviv_obj->last_cpu_prep_op = 0;
 427         }
 428
 429         return 0;
 430 }
 431
 432 int etnaviv_gem_wait_bo(struct etnaviv_gpu *gpu, struct drm_gem_object *obj,
 433         struct drm_etnaviv_timespec *timeout)
 434 {
 435         struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
 436
 437         return etnaviv_gpu_wait_obj_inactive(gpu, etnaviv_obj, timeout);
 438 }
 439
 440 #ifdef CONFIG_DEBUG_FS
 441 static void etnaviv_gem_describe_fence(struct dma_fence *fence,
 442         const char *type, struct seq_file *m)
 443 {
 444         if (!test_bit(DMA_FENCE_FLAG_SIGNALED_BIT, &fence->flags))
 445                 seq_printf(m, "\t%9s: %s %s seq %llu\n",
 446                            type,
 447                            fence->ops->get_driver_name(fence),
 448                            fence->ops->get_timeline_name(fence),
 449                            fence->seqno);
 450 }
 451
 452 static void etnaviv_gem_describe(struct drm_gem_object *obj, struct seq_file *m)
 453 {
 454         struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
 455         struct dma_resv *robj = obj->resv;
 456         struct dma_resv_list *fobj;
 457         struct dma_fence *fence;
 458         unsigned long off = drm_vma_node_start(&obj->vma_node);
 459
 460         seq_printf(m, "%08x: %c %2d (%2d) %08lx %p %zd\n",
 461                         etnaviv_obj->flags, is_active(etnaviv_obj) ? 'A' : 'I',
 462                         obj->name, kref_read(&obj->refcount),
 463                         off, etnaviv_obj->vaddr, obj->size);
 464
 465         rcu_read_lock();
 466         fobj = rcu_dereference(robj->fence);
 467         if (fobj) {
 468                 unsigned int i, shared_count = fobj->shared_count;
 469
 470                 for (i = 0; i < shared_count; i++) {
 471                         fence = rcu_dereference(fobj->shared[i]);
 472                         etnaviv_gem_describe_fence(fence, "Shared", m);
 473                 }
 474         }
 475
 476         fence = rcu_dereference(robj->fence_excl);
 477         if (fence)
 478                 etnaviv_gem_describe_fence(fence, "Exclusive", m);
 479         rcu_read_unlock();
 480 }
 481
 482 void etnaviv_gem_describe_objects(struct etnaviv_drm_private *priv,
 483         struct seq_file *m)
 484 {
 485         struct etnaviv_gem_object *etnaviv_obj;
 486         int count = 0;
 487         size_t size = 0;
 488
 489         mutex_lock(&priv->gem_lock);
 490         list_for_each_entry(etnaviv_obj, &priv->gem_list, gem_node) {
 491                 struct drm_gem_object *obj = &etnaviv_obj->base;
 492
 493                 seq_puts(m, "   ");
 494                 etnaviv_gem_describe(obj, m);
 495                 count++;
 496                 size += obj->size;
 497         }
 498         mutex_unlock(&priv->gem_lock);
 499
 500         seq_printf(m, "Total %d objects, %zu bytes\n", count, size);
 501 }
 502 #endif
 503
 504 static void etnaviv_gem_shmem_release(struct etnaviv_gem_object *etnaviv_obj)
 505 {
 506         vunmap(etnaviv_obj->vaddr);
 507         put_pages(etnaviv_obj);
 508 }
 509
 510 static const struct etnaviv_gem_ops etnaviv_gem_shmem_ops = {
 511         .get_pages = etnaviv_gem_shmem_get_pages,
 512         .release = etnaviv_gem_shmem_release,
 513         .vmap = etnaviv_gem_vmap_impl,
 514         .mmap = etnaviv_gem_mmap_obj,
 515 };
 516
 517 void etnaviv_gem_free_object(struct drm_gem_object *obj)
 518 {
 519         struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
 520         struct etnaviv_drm_private *priv = obj->dev->dev_private;
 521         struct etnaviv_vram_mapping *mapping, *tmp;
 522
 523         /* object should not be active */
 524         WARN_ON(is_active(etnaviv_obj));
 525
 526         mutex_lock(&priv->gem_lock);
 527         list_del(&etnaviv_obj->gem_node);
 528         mutex_unlock(&priv->gem_lock);
 529
 530         list_for_each_entry_safe(mapping, tmp, &etnaviv_obj->vram_list,
 531                                  obj_node) {
 532                 struct etnaviv_iommu_context *context = mapping->context;
 533
 534                 WARN_ON(mapping->use);
 535
 536                 if (context) {
 537                         etnaviv_iommu_unmap_gem(context, mapping);
 538                         etnaviv_iommu_context_put(context);
 539                 }
 540
 541                 list_del(&mapping->obj_node);
 542                 kfree(mapping);
 543         }
 544
 545         drm_gem_free_mmap_offset(obj);
 546         etnaviv_obj->ops->release(etnaviv_obj);
 547         drm_gem_object_release(obj);
 548
 549         kfree(etnaviv_obj);
 550 }
 551
 552 void etnaviv_gem_obj_add(struct drm_device *dev, struct drm_gem_object *obj)
 553 {
 554         struct etnaviv_drm_private *priv = dev->dev_private;
 555         struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
 556
 557         mutex_lock(&priv->gem_lock);
 558         list_add_tail(&etnaviv_obj->gem_node, &priv->gem_list);
 559         mutex_unlock(&priv->gem_lock);
 560 }
 561
 562 static const struct vm_operations_struct vm_ops = {
 563         .fault = etnaviv_gem_fault,
 564         .open = drm_gem_vm_open,
 565         .close = drm_gem_vm_close,
 566 };
 567
 568 static const struct drm_gem_object_funcs etnaviv_gem_object_funcs = {
 569         .free = etnaviv_gem_free_object,
 570         .pin = etnaviv_gem_prime_pin,
 571         .unpin = etnaviv_gem_prime_unpin,
 572         .get_sg_table = etnaviv_gem_prime_get_sg_table,
 573         .vmap = etnaviv_gem_prime_vmap,
 574         .vunmap = etnaviv_gem_prime_vunmap,
 575         .vm_ops = &vm_ops,
 576 };
 577
 578 static int etnaviv_gem_new_impl(struct drm_device *dev, u32 size, u32 flags,
 579         const struct etnaviv_gem_ops *ops, struct drm_gem_object **obj)
 580 {
 581         struct etnaviv_gem_object *etnaviv_obj;
 582         unsigned sz = sizeof(*etnaviv_obj);
 583         bool valid = true;
 584
 585         /* validate flags */
 586         switch (flags & ETNA_BO_CACHE_MASK) {
 587         case ETNA_BO_UNCACHED:
 588         case ETNA_BO_CACHED:
 589         case ETNA_BO_WC:
 590                 break;
 591         default:
 592                 valid = false;
 593         }
 594
 595         if (!valid) {
 596                 dev_err(dev->dev, "invalid cache flag: %x\n",
 597                         (flags & ETNA_BO_CACHE_MASK));
 598                 return -EINVAL;
 599         }
 600
 601         etnaviv_obj = kzalloc(sz, GFP_KERNEL);
 602         if (!etnaviv_obj)
 603                 return -ENOMEM;
 604
 605         etnaviv_obj->flags = flags;
 606         etnaviv_obj->ops = ops;
 607
 608         mutex_init(&etnaviv_obj->lock);
 609         INIT_LIST_HEAD(&etnaviv_obj->vram_list);
 610
 611         *obj = &etnaviv_obj->base;
 612         (*obj)->funcs = &etnaviv_gem_object_funcs;
 613
 614         return 0;
 615 }
 616
 617 /* convenience method to construct a GEM buffer object, and userspace handle */
 618 int etnaviv_gem_new_handle(struct drm_device *dev, struct drm_file *file,
 619         u32 size, u32 flags, u32 *handle)
 620 {
 621         struct etnaviv_drm_private *priv = dev->dev_private;
 622         struct drm_gem_object *obj = NULL;
 623         int ret;
 624
 625         size = PAGE_ALIGN(size);
 626
 627         ret = etnaviv_gem_new_impl(dev, size, flags,
 628                                    &etnaviv_gem_shmem_ops, &obj);
 629         if (ret)
 630                 goto fail;
 631
 632         lockdep_set_class(&to_etnaviv_bo(obj)->lock, &etnaviv_shm_lock_class);
 633
 634         ret = drm_gem_object_init(dev, obj, size);
 635         if (ret)
 636                 goto fail;
 637
 638         /*
 639          * Our buffers are kept pinned, so allocating them from the MOVABLE
 640          * zone is a really bad idea, and conflicts with CMA. See comments
 641          * above new_inode() why this is required _and_ expected if you're
 642          * going to pin these pages.
 643          */
 644         mapping_set_gfp_mask(obj->filp->f_mapping, priv->shm_gfp_mask);
 645
 646         etnaviv_gem_obj_add(dev, obj);
 647
 648         ret = drm_gem_handle_create(file, obj, handle);
 649
 650         /* drop reference from allocate - handle holds it now */
 651 fail:
 652         drm_gem_object_put(obj);
 653
 654         return ret;
 655 }
 656
 657 int etnaviv_gem_new_private(struct drm_device *dev, size_t size, u32 flags,
 658         const struct etnaviv_gem_ops *ops, struct etnaviv_gem_object **res)
 659 {
 660         struct drm_gem_object *obj;
 661         int ret;
 662
 663         ret = etnaviv_gem_new_impl(dev, size, flags, ops, &obj);
 664         if (ret)
 665                 return ret;
 666
 667         drm_gem_private_object_init(dev, obj, size);
 668
 669         *res = to_etnaviv_bo(obj);
 670
 671         return 0;
 672 }
 673
 674 static int etnaviv_gem_userptr_get_pages(struct etnaviv_gem_object *etnaviv_obj)
 675 {
 676         struct page **pvec = NULL;
 677         struct etnaviv_gem_userptr *userptr = &etnaviv_obj->userptr;
 678         int ret, pinned = 0, npages = etnaviv_obj->base.size >> PAGE_SHIFT;
 679
 680         might_lock_read(&current->mm->mmap_lock);
 681
 682         if (userptr->mm != current->mm)
 683                 return -EPERM;
 684
 685         pvec = kvmalloc_array(npages, sizeof(struct page *), GFP_KERNEL);
 686         if (!pvec)
 687                 return -ENOMEM;
 688
 689         do {
 690                 unsigned num_pages = npages - pinned;
 691                 uint64_t ptr = userptr->ptr + pinned * PAGE_SIZE;
 692                 struct page **pages = pvec + pinned;
 693
 694                 ret = pin_user_pages_fast(ptr, num_pages,
 695                                           !userptr->ro ? FOLL_WRITE : 0, pages);
 696                 if (ret < 0) {
 697                         unpin_user_pages(pvec, pinned);
 698                         kvfree(pvec);
 699                         return ret;
 700                 }
 701
 702                 pinned += ret;
 703
 704         } while (pinned < npages);
 705
 706         etnaviv_obj->pages = pvec;
 707
 708         return 0;
 709 }
 710
 711 static void etnaviv_gem_userptr_release(struct etnaviv_gem_object *etnaviv_obj)
 712 {
 713         if (etnaviv_obj->sgt) {
 714                 etnaviv_gem_scatterlist_unmap(etnaviv_obj);
 715                 sg_free_table(etnaviv_obj->sgt);
 716                 kfree(etnaviv_obj->sgt);
 717         }
 718         if (etnaviv_obj->pages) {
 719                 int npages = etnaviv_obj->base.size >> PAGE_SHIFT;
 720
 721                 unpin_user_pages(etnaviv_obj->pages, npages);
 722                 kvfree(etnaviv_obj->pages);
 723         }
 724 }
 725
 726 static int etnaviv_gem_userptr_mmap_obj(struct etnaviv_gem_object *etnaviv_obj,
 727                 struct vm_area_struct *vma)
 728 {
 729         return -EINVAL;
 730 }
 731
 732 static const struct etnaviv_gem_ops etnaviv_gem_userptr_ops = {
 733         .get_pages = etnaviv_gem_userptr_get_pages,
 734         .release = etnaviv_gem_userptr_release,
 735         .vmap = etnaviv_gem_vmap_impl,
 736         .mmap = etnaviv_gem_userptr_mmap_obj,
 737 };
 738
 739 int etnaviv_gem_new_userptr(struct drm_device *dev, struct drm_file *file,
 740         uintptr_t ptr, u32 size, u32 flags, u32 *handle)
 741 {
 742         struct etnaviv_gem_object *etnaviv_obj;
 743         int ret;
 744
 745         ret = etnaviv_gem_new_private(dev, size, ETNA_BO_CACHED,
 746                                       &etnaviv_gem_userptr_ops, &etnaviv_obj);
 747         if (ret)
 748                 return ret;
 749
 750         lockdep_set_class(&etnaviv_obj->lock, &etnaviv_userptr_lock_class);
 751
 752         etnaviv_obj->userptr.ptr = ptr;
 753         etnaviv_obj->userptr.mm = current->mm;
 754         etnaviv_obj->userptr.ro = !(flags & ETNA_USERPTR_WRITE);
 755
 756         etnaviv_gem_obj_add(dev, &etnaviv_obj->base);
 757
 758         ret = drm_gem_handle_create(file, &etnaviv_obj->base, handle);
 759
 760         /* drop reference from allocate - handle holds it now */
 761         drm_gem_object_put(&etnaviv_obj->base);
 762         return ret;
 763 }