drivers/gpu/drm/msm/msm_gem.c

   1 /*
   2  * Copyright (C) 2013 Red Hat
   3  * Author: Rob Clark <robdclark@gmail.com>
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 as published by
   7  * the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  12  * more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along with
  15  * this program.  If not, see <http://www.gnu.org/licenses/>.
  16  */
  17
  18 #include <linux/spinlock.h>
  19 #include <linux/shmem_fs.h>
  20 #include <linux/dma-buf.h>
  21 #include <linux/pfn_t.h>
  22
  23 #include "msm_drv.h"
  24 #include "msm_fence.h"
  25 #include "msm_gem.h"
  26 #include "msm_gpu.h"
  27 #include "msm_mmu.h"
  28
  29 static dma_addr_t physaddr(struct drm_gem_object *obj)
  30 {
  31         struct msm_gem_object *msm_obj = to_msm_bo(obj);
  32         struct msm_drm_private *priv = obj->dev->dev_private;
  33         return (((dma_addr_t)msm_obj->vram_node->start) << PAGE_SHIFT) +
  34                         priv->vram.paddr;
  35 }
  36
  37 static bool use_pages(struct drm_gem_object *obj)
  38 {
  39         struct msm_gem_object *msm_obj = to_msm_bo(obj);
  40         return !msm_obj->vram_node;
  41 }
  42
  43 /* allocate pages from VRAM carveout, used when no IOMMU: */
  44 static struct page **get_pages_vram(struct drm_gem_object *obj,
  45                 int npages)
  46 {
  47         struct msm_gem_object *msm_obj = to_msm_bo(obj);
  48         struct msm_drm_private *priv = obj->dev->dev_private;
  49         dma_addr_t paddr;
  50         struct page **p;
  51         int ret, i;
  52
  53         p = drm_malloc_ab(npages, sizeof(struct page *));
  54         if (!p)
  55                 return ERR_PTR(-ENOMEM);
  56
  57         ret = drm_mm_insert_node(&priv->vram.mm, msm_obj->vram_node,
  58                         npages, 0, DRM_MM_SEARCH_DEFAULT);
  59         if (ret) {
  60                 drm_free_large(p);
  61                 return ERR_PTR(ret);
  62         }
  63
  64         paddr = physaddr(obj);
  65         for (i = 0; i < npages; i++) {
  66                 p[i] = phys_to_page(paddr);
  67                 paddr += PAGE_SIZE;
  68         }
  69
  70         return p;
  71 }
  72
  73 /* called with dev->struct_mutex held */
  74 static struct page **get_pages(struct drm_gem_object *obj)
  75 {
  76         struct msm_gem_object *msm_obj = to_msm_bo(obj);
  77
  78         if (!msm_obj->pages) {
  79                 struct drm_device *dev = obj->dev;
  80                 struct page **p;
  81                 int npages = obj->size >> PAGE_SHIFT;
  82
  83                 if (use_pages(obj))
  84                         p = drm_gem_get_pages(obj);
  85                 else
  86                         p = get_pages_vram(obj, npages);
  87
  88                 if (IS_ERR(p)) {
  89                         dev_err(dev->dev, "could not get pages: %ld\n",
  90                                         PTR_ERR(p));
  91                         return p;
  92                 }
  93
  94                 msm_obj->sgt = drm_prime_pages_to_sg(p, npages);
  95                 if (IS_ERR(msm_obj->sgt)) {
  96                         dev_err(dev->dev, "failed to allocate sgt\n");
  97                         return ERR_CAST(msm_obj->sgt);
  98                 }
  99
 100                 msm_obj->pages = p;
 101
 102                 /* For non-cached buffers, ensure the new pages are clean
 103                  * because display controller, GPU, etc. are not coherent:
 104                  */
 105                 if (msm_obj->flags & (MSM_BO_WC|MSM_BO_UNCACHED))
 106                         dma_map_sg(dev->dev, msm_obj->sgt->sgl,
 107                                         msm_obj->sgt->nents, DMA_BIDIRECTIONAL);
 108         }
 109
 110         return msm_obj->pages;
 111 }
 112
 113 static void put_pages(struct drm_gem_object *obj)
 114 {
 115         struct msm_gem_object *msm_obj = to_msm_bo(obj);
 116
 117         if (msm_obj->pages) {
 118                 /* For non-cached buffers, ensure the new pages are clean
 119                  * because display controller, GPU, etc. are not coherent:
 120                  */
 121                 if (msm_obj->flags & (MSM_BO_WC|MSM_BO_UNCACHED))
 122                         dma_unmap_sg(obj->dev->dev, msm_obj->sgt->sgl,
 123                                         msm_obj->sgt->nents, DMA_BIDIRECTIONAL);
 124                 sg_free_table(msm_obj->sgt);
 125                 kfree(msm_obj->sgt);
 126
 127                 if (use_pages(obj))
 128                         drm_gem_put_pages(obj, msm_obj->pages, true, false);
 129                 else {
 130                         drm_mm_remove_node(msm_obj->vram_node);
 131                         drm_free_large(msm_obj->pages);
 132                 }
 133
 134                 msm_obj->pages = NULL;
 135         }
 136 }
 137
 138 struct page **msm_gem_get_pages(struct drm_gem_object *obj)
 139 {
 140         struct drm_device *dev = obj->dev;
 141         struct page **p;
 142         mutex_lock(&dev->struct_mutex);
 143         p = get_pages(obj);
 144         mutex_unlock(&dev->struct_mutex);
 145         return p;
 146 }
 147
 148 void msm_gem_put_pages(struct drm_gem_object *obj)
 149 {
 150         /* when we start tracking the pin count, then do something here */
 151 }
 152
 153 int msm_gem_mmap_obj(struct drm_gem_object *obj,
 154                 struct vm_area_struct *vma)
 155 {
 156         struct msm_gem_object *msm_obj = to_msm_bo(obj);
 157
 158         vma->vm_flags &= ~VM_PFNMAP;
 159         vma->vm_flags |= VM_MIXEDMAP;
 160
 161         if (msm_obj->flags & MSM_BO_WC) {
 162                 vma->vm_page_prot = pgprot_writecombine(vm_get_page_prot(vma->vm_flags));
 163         } else if (msm_obj->flags & MSM_BO_UNCACHED) {
 164                 vma->vm_page_prot = pgprot_noncached(vm_get_page_prot(vma->vm_flags));
 165         } else {
 166                 /*
 167                  * Shunt off cached objs to shmem file so they have their own
 168                  * address_space (so unmap_mapping_range does what we want,
 169                  * in particular in the case of mmap'd dmabufs)
 170                  */
 171                 fput(vma->vm_file);
 172                 get_file(obj->filp);
 173                 vma->vm_pgoff = 0;
 174                 vma->vm_file  = obj->filp;
 175
 176                 vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
 177         }
 178
 179         return 0;
 180 }
 181
 182 int msm_gem_mmap(struct file *filp, struct vm_area_struct *vma)
 183 {
 184         int ret;
 185
 186         ret = drm_gem_mmap(filp, vma);
 187         if (ret) {
 188                 DBG("mmap failed: %d", ret);
 189                 return ret;
 190         }
 191
 192         return msm_gem_mmap_obj(vma->vm_private_data, vma);
 193 }
 194
 195 int msm_gem_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
 196 {
 197         struct drm_gem_object *obj = vma->vm_private_data;
 198         struct drm_device *dev = obj->dev;
 199         struct page **pages;
 200         unsigned long pfn;
 201         pgoff_t pgoff;
 202         int ret;
 203
 204         /* Make sure we don't parallel update on a fault, nor move or remove
 205          * something from beneath our feet
 206          */
 207         ret = mutex_lock_interruptible(&dev->struct_mutex);
 208         if (ret)
 209                 goto out;
 210
 211         /* make sure we have pages attached now */
 212         pages = get_pages(obj);
 213         if (IS_ERR(pages)) {
 214                 ret = PTR_ERR(pages);
 215                 goto out_unlock;
 216         }
 217
 218         /* We don't use vmf->pgoff since that has the fake offset: */
 219         pgoff = ((unsigned long)vmf->virtual_address -
 220                         vma->vm_start) >> PAGE_SHIFT;
 221
 222         pfn = page_to_pfn(pages[pgoff]);
 223
 224         VERB("Inserting %p pfn %lx, pa %lx", vmf->virtual_address,
 225                         pfn, pfn << PAGE_SHIFT);
 226
 227         ret = vm_insert_mixed(vma, (unsigned long)vmf->virtual_address,
 228                         __pfn_to_pfn_t(pfn, PFN_DEV));
 229
 230 out_unlock:
 231         mutex_unlock(&dev->struct_mutex);
 232 out:
 233         switch (ret) {
 234         case -EAGAIN:
 235         case 0:
 236         case -ERESTARTSYS:
 237         case -EINTR:
 238         case -EBUSY:
 239                 /*
 240                  * EBUSY is ok: this just means that another thread
 241                  * already did the job.
 242                  */
 243                 return VM_FAULT_NOPAGE;
 244         case -ENOMEM:
 245                 return VM_FAULT_OOM;
 246         default:
 247                 return VM_FAULT_SIGBUS;
 248         }
 249 }
 250
 251 /** get mmap offset */
 252 static uint64_t mmap_offset(struct drm_gem_object *obj)
 253 {
 254         struct drm_device *dev = obj->dev;
 255         int ret;
 256
 257         WARN_ON(!mutex_is_locked(&dev->struct_mutex));
 258
 259         /* Make it mmapable */
 260         ret = drm_gem_create_mmap_offset(obj);
 261
 262         if (ret) {
 263                 dev_err(dev->dev, "could not allocate mmap offset\n");
 264                 return 0;
 265         }
 266
 267         return drm_vma_node_offset_addr(&obj->vma_node);
 268 }
 269
 270 uint64_t msm_gem_mmap_offset(struct drm_gem_object *obj)
 271 {
 272         uint64_t offset;
 273         mutex_lock(&obj->dev->struct_mutex);
 274         offset = mmap_offset(obj);
 275         mutex_unlock(&obj->dev->struct_mutex);
 276         return offset;
 277 }
 278
 279 /* should be called under struct_mutex.. although it can be called
 280  * from atomic context without struct_mutex to acquire an extra
 281  * iova ref if you know one is already held.
 282  *
 283  * That means when I do eventually need to add support for unpinning
 284  * the refcnt counter needs to be atomic_t.
 285  */
 286 int msm_gem_get_iova_locked(struct drm_gem_object *obj, int id,
 287                 uint32_t *iova)
 288 {
 289         struct msm_gem_object *msm_obj = to_msm_bo(obj);
 290         int ret = 0;
 291
 292         if (!msm_obj->domain[id].iova) {
 293                 struct msm_drm_private *priv = obj->dev->dev_private;
 294                 struct page **pages = get_pages(obj);
 295
 296                 if (IS_ERR(pages))
 297                         return PTR_ERR(pages);
 298
 299                 if (iommu_present(&platform_bus_type)) {
 300                         struct msm_mmu *mmu = priv->mmus[id];
 301                         uint32_t offset;
 302
 303                         if (WARN_ON(!mmu))
 304                                 return -EINVAL;
 305
 306                         offset = (uint32_t)mmap_offset(obj);
 307                         ret = mmu->funcs->map(mmu, offset, msm_obj->sgt,
 308                                         obj->size, IOMMU_READ | IOMMU_WRITE);
 309                         msm_obj->domain[id].iova = offset;
 310                 } else {
 311                         msm_obj->domain[id].iova = physaddr(obj);
 312                 }
 313         }
 314
 315         if (!ret)
 316                 *iova = msm_obj->domain[id].iova;
 317
 318         return ret;
 319 }
 320
 321 /* get iova, taking a reference.  Should have a matching put */
 322 int msm_gem_get_iova(struct drm_gem_object *obj, int id, uint32_t *iova)
 323 {
 324         struct msm_gem_object *msm_obj = to_msm_bo(obj);
 325         int ret;
 326
 327         /* this is safe right now because we don't unmap until the
 328          * bo is deleted:
 329          */
 330         if (msm_obj->domain[id].iova) {
 331                 *iova = msm_obj->domain[id].iova;
 332                 return 0;
 333         }
 334
 335         mutex_lock(&obj->dev->struct_mutex);
 336         ret = msm_gem_get_iova_locked(obj, id, iova);
 337         mutex_unlock(&obj->dev->struct_mutex);
 338         return ret;
 339 }
 340
 341 /* get iova without taking a reference, used in places where you have
 342  * already done a 'msm_gem_get_iova()'.
 343  */
 344 uint32_t msm_gem_iova(struct drm_gem_object *obj, int id)
 345 {
 346         struct msm_gem_object *msm_obj = to_msm_bo(obj);
 347         WARN_ON(!msm_obj->domain[id].iova);
 348         return msm_obj->domain[id].iova;
 349 }
 350
 351 void msm_gem_put_iova(struct drm_gem_object *obj, int id)
 352 {
 353         // XXX TODO ..
 354         // NOTE: probably don't need a _locked() version.. we wouldn't
 355         // normally unmap here, but instead just mark that it could be
 356         // unmapped (if the iova refcnt drops to zero), but then later
 357         // if another _get_iova_locked() fails we can start unmapping
 358         // things that are no longer needed..
 359 }
 360
 361 int msm_gem_dumb_create(struct drm_file *file, struct drm_device *dev,
 362                 struct drm_mode_create_dumb *args)
 363 {
 364         args->pitch = align_pitch(args->width, args->bpp);
 365         args->size  = PAGE_ALIGN(args->pitch * args->height);
 366         return msm_gem_new_handle(dev, file, args->size,
 367                         MSM_BO_SCANOUT | MSM_BO_WC, &args->handle);
 368 }
 369
 370 int msm_gem_dumb_map_offset(struct drm_file *file, struct drm_device *dev,
 371                 uint32_t handle, uint64_t *offset)
 372 {
 373         struct drm_gem_object *obj;
 374         int ret = 0;
 375
 376         /* GEM does all our handle to object mapping */
 377         obj = drm_gem_object_lookup(file, handle);
 378         if (obj == NULL) {
 379                 ret = -ENOENT;
 380                 goto fail;
 381         }
 382
 383         *offset = msm_gem_mmap_offset(obj);
 384
 385         drm_gem_object_unreference_unlocked(obj);
 386
 387 fail:
 388         return ret;
 389 }
 390
 391 void *msm_gem_vaddr_locked(struct drm_gem_object *obj)
 392 {
 393         struct msm_gem_object *msm_obj = to_msm_bo(obj);
 394         WARN_ON(!mutex_is_locked(&obj->dev->struct_mutex));
 395         if (!msm_obj->vaddr) {
 396                 struct page **pages = get_pages(obj);
 397                 if (IS_ERR(pages))
 398                         return ERR_CAST(pages);
 399                 msm_obj->vaddr = vmap(pages, obj->size >> PAGE_SHIFT,
 400                                 VM_MAP, pgprot_writecombine(PAGE_KERNEL));
 401         }
 402         return msm_obj->vaddr;
 403 }
 404
 405 void *msm_gem_vaddr(struct drm_gem_object *obj)
 406 {
 407         void *ret;
 408         mutex_lock(&obj->dev->struct_mutex);
 409         ret = msm_gem_vaddr_locked(obj);
 410         mutex_unlock(&obj->dev->struct_mutex);
 411         return ret;
 412 }
 413
 414 /* must be called before _move_to_active().. */
 415 int msm_gem_sync_object(struct drm_gem_object *obj,
 416                 struct msm_fence_context *fctx, bool exclusive)
 417 {
 418         struct msm_gem_object *msm_obj = to_msm_bo(obj);
 419         struct reservation_object_list *fobj;
 420         struct fence *fence;
 421         int i, ret;
 422
 423         if (!exclusive) {
 424                 /* NOTE: _reserve_shared() must happen before _add_shared_fence(),
 425                  * which makes this a slightly strange place to call it.  OTOH this
 426                  * is a convenient can-fail point to hook it in.  (And similar to
 427                  * how etnaviv and nouveau handle this.)
 428                  */
 429                 ret = reservation_object_reserve_shared(msm_obj->resv);
 430                 if (ret)
 431                         return ret;
 432         }
 433
 434         fobj = reservation_object_get_list(msm_obj->resv);
 435         if (!fobj || (fobj->shared_count == 0)) {
 436                 fence = reservation_object_get_excl(msm_obj->resv);
 437                 /* don't need to wait on our own fences, since ring is fifo */
 438                 if (fence && (fence->context != fctx->context)) {
 439                         ret = fence_wait(fence, true);
 440                         if (ret)
 441                                 return ret;
 442                 }
 443         }
 444
 445         if (!exclusive || !fobj)
 446                 return 0;
 447
 448         for (i = 0; i < fobj->shared_count; i++) {
 449                 fence = rcu_dereference_protected(fobj->shared[i],
 450                                                 reservation_object_held(msm_obj->resv));
 451                 if (fence->context != fctx->context) {
 452                         ret = fence_wait(fence, true);
 453                         if (ret)
 454                                 return ret;
 455                 }
 456         }
 457
 458         return 0;
 459 }
 460
 461 void msm_gem_move_to_active(struct drm_gem_object *obj,
 462                 struct msm_gpu *gpu, bool exclusive, struct fence *fence)
 463 {
 464         struct msm_gem_object *msm_obj = to_msm_bo(obj);
 465         msm_obj->gpu = gpu;
 466         if (exclusive)
 467                 reservation_object_add_excl_fence(msm_obj->resv, fence);
 468         else
 469                 reservation_object_add_shared_fence(msm_obj->resv, fence);
 470         list_del_init(&msm_obj->mm_list);
 471         list_add_tail(&msm_obj->mm_list, &gpu->active_list);
 472 }
 473
 474 void msm_gem_move_to_inactive(struct drm_gem_object *obj)
 475 {
 476         struct drm_device *dev = obj->dev;
 477         struct msm_drm_private *priv = dev->dev_private;
 478         struct msm_gem_object *msm_obj = to_msm_bo(obj);
 479
 480         WARN_ON(!mutex_is_locked(&dev->struct_mutex));
 481
 482         msm_obj->gpu = NULL;
 483         list_del_init(&msm_obj->mm_list);
 484         list_add_tail(&msm_obj->mm_list, &priv->inactive_list);
 485 }
 486
 487 int msm_gem_cpu_prep(struct drm_gem_object *obj, uint32_t op, ktime_t *timeout)
 488 {
 489         struct msm_gem_object *msm_obj = to_msm_bo(obj);
 490         bool write = !!(op & MSM_PREP_WRITE);
 491
 492         if (op & MSM_PREP_NOSYNC) {
 493                 if (!reservation_object_test_signaled_rcu(msm_obj->resv, write))
 494                         return -EBUSY;
 495         } else {
 496                 int ret;
 497
 498                 ret = reservation_object_wait_timeout_rcu(msm_obj->resv, write,
 499                                 true, timeout_to_jiffies(timeout));
 500                 if (ret <= 0)
 501                         return ret == 0 ? -ETIMEDOUT : ret;
 502         }
 503
 504         /* TODO cache maintenance */
 505
 506         return 0;
 507 }
 508
 509 int msm_gem_cpu_fini(struct drm_gem_object *obj)
 510 {
 511         /* TODO cache maintenance */
 512         return 0;
 513 }
 514
 515 #ifdef CONFIG_DEBUG_FS
 516 static void describe_fence(struct fence *fence, const char *type,
 517                 struct seq_file *m)
 518 {
 519         if (!fence_is_signaled(fence))
 520                 seq_printf(m, "\t%9s: %s %s seq %u\n", type,
 521                                 fence->ops->get_driver_name(fence),
 522                                 fence->ops->get_timeline_name(fence),
 523                                 fence->seqno);
 524 }
 525
 526 void msm_gem_describe(struct drm_gem_object *obj, struct seq_file *m)
 527 {
 528         struct msm_gem_object *msm_obj = to_msm_bo(obj);
 529         struct reservation_object *robj = msm_obj->resv;
 530         struct reservation_object_list *fobj;
 531         struct fence *fence;
 532         uint64_t off = drm_vma_node_start(&obj->vma_node);
 533
 534         WARN_ON(!mutex_is_locked(&obj->dev->struct_mutex));
 535
 536         seq_printf(m, "%08x: %c %2d (%2d) %08llx %p %zu\n",
 537                         msm_obj->flags, is_active(msm_obj) ? 'A' : 'I',
 538                         obj->name, obj->refcount.refcount.counter,
 539                         off, msm_obj->vaddr, obj->size);
 540
 541         rcu_read_lock();
 542         fobj = rcu_dereference(robj->fence);
 543         if (fobj) {
 544                 unsigned int i, shared_count = fobj->shared_count;
 545
 546                 for (i = 0; i < shared_count; i++) {
 547                         fence = rcu_dereference(fobj->shared[i]);
 548                         describe_fence(fence, "Shared", m);
 549                 }
 550         }
 551
 552         fence = rcu_dereference(robj->fence_excl);
 553         if (fence)
 554                 describe_fence(fence, "Exclusive", m);
 555         rcu_read_unlock();
 556 }
 557
 558 void msm_gem_describe_objects(struct list_head *list, struct seq_file *m)
 559 {
 560         struct msm_gem_object *msm_obj;
 561         int count = 0;
 562         size_t size = 0;
 563
 564         list_for_each_entry(msm_obj, list, mm_list) {
 565                 struct drm_gem_object *obj = &msm_obj->base;
 566                 seq_printf(m, "   ");
 567                 msm_gem_describe(obj, m);
 568                 count++;
 569                 size += obj->size;
 570         }
 571
 572         seq_printf(m, "Total %d objects, %zu bytes\n", count, size);
 573 }
 574 #endif
 575
 576 void msm_gem_free_object(struct drm_gem_object *obj)
 577 {
 578         struct drm_device *dev = obj->dev;
 579         struct msm_drm_private *priv = obj->dev->dev_private;
 580         struct msm_gem_object *msm_obj = to_msm_bo(obj);
 581         int id;
 582
 583         WARN_ON(!mutex_is_locked(&dev->struct_mutex));
 584
 585         /* object should not be on active list: */
 586         WARN_ON(is_active(msm_obj));
 587
 588         list_del(&msm_obj->mm_list);
 589
 590         for (id = 0; id < ARRAY_SIZE(msm_obj->domain); id++) {
 591                 struct msm_mmu *mmu = priv->mmus[id];
 592                 if (mmu && msm_obj->domain[id].iova) {
 593                         uint32_t offset = msm_obj->domain[id].iova;
 594                         mmu->funcs->unmap(mmu, offset, msm_obj->sgt, obj->size);
 595                 }
 596         }
 597
 598         if (obj->import_attach) {
 599                 if (msm_obj->vaddr)
 600                         dma_buf_vunmap(obj->import_attach->dmabuf, msm_obj->vaddr);
 601
 602                 /* Don't drop the pages for imported dmabuf, as they are not
 603                  * ours, just free the array we allocated:
 604                  */
 605                 if (msm_obj->pages)
 606                         drm_free_large(msm_obj->pages);
 607
 608                 drm_prime_gem_destroy(obj, msm_obj->sgt);
 609         } else {
 610                 vunmap(msm_obj->vaddr);
 611                 put_pages(obj);
 612         }
 613
 614         if (msm_obj->resv == &msm_obj->_resv)
 615                 reservation_object_fini(msm_obj->resv);
 616
 617         drm_gem_object_release(obj);
 618
 619         kfree(msm_obj);
 620 }
 621
 622 /* convenience method to construct a GEM buffer object, and userspace handle */
 623 int msm_gem_new_handle(struct drm_device *dev, struct drm_file *file,
 624                 uint32_t size, uint32_t flags, uint32_t *handle)
 625 {
 626         struct drm_gem_object *obj;
 627         int ret;
 628
 629         ret = mutex_lock_interruptible(&dev->struct_mutex);
 630         if (ret)
 631                 return ret;
 632
 633         obj = msm_gem_new(dev, size, flags);
 634
 635         mutex_unlock(&dev->struct_mutex);
 636
 637         if (IS_ERR(obj))
 638                 return PTR_ERR(obj);
 639
 640         ret = drm_gem_handle_create(file, obj, handle);
 641
 642         /* drop reference from allocate - handle holds it now */
 643         drm_gem_object_unreference_unlocked(obj);
 644
 645         return ret;
 646 }
 647
 648 static int msm_gem_new_impl(struct drm_device *dev,
 649                 uint32_t size, uint32_t flags,
 650                 struct reservation_object *resv,
 651                 struct drm_gem_object **obj)
 652 {
 653         struct msm_drm_private *priv = dev->dev_private;
 654         struct msm_gem_object *msm_obj;
 655         unsigned sz;
 656         bool use_vram = false;
 657
 658         switch (flags & MSM_BO_CACHE_MASK) {
 659         case MSM_BO_UNCACHED:
 660         case MSM_BO_CACHED:
 661         case MSM_BO_WC:
 662                 break;
 663         default:
 664                 dev_err(dev->dev, "invalid cache flag: %x\n",
 665                                 (flags & MSM_BO_CACHE_MASK));
 666                 return -EINVAL;
 667         }
 668
 669         if (!iommu_present(&platform_bus_type))
 670                 use_vram = true;
 671         else if ((flags & MSM_BO_STOLEN) && priv->vram.size)
 672                 use_vram = true;
 673
 674         if (WARN_ON(use_vram && !priv->vram.size))
 675                 return -EINVAL;
 676
 677         sz = sizeof(*msm_obj);
 678         if (use_vram)
 679                 sz += sizeof(struct drm_mm_node);
 680
 681         msm_obj = kzalloc(sz, GFP_KERNEL);
 682         if (!msm_obj)
 683                 return -ENOMEM;
 684
 685         if (use_vram)
 686                 msm_obj->vram_node = (void *)&msm_obj[1];
 687
 688         msm_obj->flags = flags;
 689
 690         if (resv) {
 691                 msm_obj->resv = resv;
 692         } else {
 693                 msm_obj->resv = &msm_obj->_resv;
 694                 reservation_object_init(msm_obj->resv);
 695         }
 696
 697         INIT_LIST_HEAD(&msm_obj->submit_entry);
 698         list_add_tail(&msm_obj->mm_list, &priv->inactive_list);
 699
 700         *obj = &msm_obj->base;
 701
 702         return 0;
 703 }
 704
 705 struct drm_gem_object *msm_gem_new(struct drm_device *dev,
 706                 uint32_t size, uint32_t flags)
 707 {
 708         struct drm_gem_object *obj = NULL;
 709         int ret;
 710
 711         WARN_ON(!mutex_is_locked(&dev->struct_mutex));
 712
 713         size = PAGE_ALIGN(size);
 714
 715         ret = msm_gem_new_impl(dev, size, flags, NULL, &obj);
 716         if (ret)
 717                 goto fail;
 718
 719         if (use_pages(obj)) {
 720                 ret = drm_gem_object_init(dev, obj, size);
 721                 if (ret)
 722                         goto fail;
 723         } else {
 724                 drm_gem_private_object_init(dev, obj, size);
 725         }
 726
 727         return obj;
 728
 729 fail:
 730         if (obj)
 731                 drm_gem_object_unreference(obj);
 732
 733         return ERR_PTR(ret);
 734 }
 735
 736 struct drm_gem_object *msm_gem_import(struct drm_device *dev,
 737                 struct dma_buf *dmabuf, struct sg_table *sgt)
 738 {
 739         struct msm_gem_object *msm_obj;
 740         struct drm_gem_object *obj;
 741         uint32_t size;
 742         int ret, npages;
 743
 744         /* if we don't have IOMMU, don't bother pretending we can import: */
 745         if (!iommu_present(&platform_bus_type)) {
 746                 dev_err(dev->dev, "cannot import without IOMMU\n");
 747                 return ERR_PTR(-EINVAL);
 748         }
 749
 750         size = PAGE_ALIGN(dmabuf->size);
 751
 752         ret = msm_gem_new_impl(dev, size, MSM_BO_WC, dmabuf->resv, &obj);
 753         if (ret)
 754                 goto fail;
 755
 756         drm_gem_private_object_init(dev, obj, size);
 757
 758         npages = size / PAGE_SIZE;
 759
 760         msm_obj = to_msm_bo(obj);
 761         msm_obj->sgt = sgt;
 762         msm_obj->pages = drm_malloc_ab(npages, sizeof(struct page *));
 763         if (!msm_obj->pages) {
 764                 ret = -ENOMEM;
 765                 goto fail;
 766         }
 767
 768         ret = drm_prime_sg_to_page_addr_arrays(sgt, msm_obj->pages, NULL, npages);
 769         if (ret)
 770                 goto fail;
 771
 772         return obj;
 773
 774 fail:
 775         if (obj)
 776                 drm_gem_object_unreference_unlocked(obj);
 777
 778         return ERR_PTR(ret);
 779 }