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 static void
 280 put_iova(struct drm_gem_object *obj)
 281 {
 282         struct drm_device *dev = obj->dev;
 283         struct msm_drm_private *priv = obj->dev->dev_private;
 284         struct msm_gem_object *msm_obj = to_msm_bo(obj);
 285         int id;
 286
 287         WARN_ON(!mutex_is_locked(&dev->struct_mutex));
 288
 289         for (id = 0; id < ARRAY_SIZE(msm_obj->domain); id++) {
 290                 struct msm_mmu *mmu = priv->mmus[id];
 291                 if (mmu && msm_obj->domain[id].iova) {
 292                         uint32_t offset = msm_obj->domain[id].iova;
 293                         mmu->funcs->unmap(mmu, offset, msm_obj->sgt, obj->size);
 294                         msm_obj->domain[id].iova = 0;
 295                 }
 296         }
 297 }
 298
 299 /* should be called under struct_mutex.. although it can be called
 300  * from atomic context without struct_mutex to acquire an extra
 301  * iova ref if you know one is already held.
 302  *
 303  * That means when I do eventually need to add support for unpinning
 304  * the refcnt counter needs to be atomic_t.
 305  */
 306 int msm_gem_get_iova_locked(struct drm_gem_object *obj, int id,
 307                 uint32_t *iova)
 308 {
 309         struct msm_gem_object *msm_obj = to_msm_bo(obj);
 310         int ret = 0;
 311
 312         if (!msm_obj->domain[id].iova) {
 313                 struct msm_drm_private *priv = obj->dev->dev_private;
 314                 struct page **pages = get_pages(obj);
 315
 316                 if (IS_ERR(pages))
 317                         return PTR_ERR(pages);
 318
 319                 if (iommu_present(&platform_bus_type)) {
 320                         struct msm_mmu *mmu = priv->mmus[id];
 321                         uint32_t offset;
 322
 323                         if (WARN_ON(!mmu))
 324                                 return -EINVAL;
 325
 326                         offset = (uint32_t)mmap_offset(obj);
 327                         ret = mmu->funcs->map(mmu, offset, msm_obj->sgt,
 328                                         obj->size, IOMMU_READ | IOMMU_WRITE);
 329                         msm_obj->domain[id].iova = offset;
 330                 } else {
 331                         msm_obj->domain[id].iova = physaddr(obj);
 332                 }
 333         }
 334
 335         if (!ret)
 336                 *iova = msm_obj->domain[id].iova;
 337
 338         return ret;
 339 }
 340
 341 /* get iova, taking a reference.  Should have a matching put */
 342 int msm_gem_get_iova(struct drm_gem_object *obj, int id, uint32_t *iova)
 343 {
 344         struct msm_gem_object *msm_obj = to_msm_bo(obj);
 345         int ret;
 346
 347         /* this is safe right now because we don't unmap until the
 348          * bo is deleted:
 349          */
 350         if (msm_obj->domain[id].iova) {
 351                 *iova = msm_obj->domain[id].iova;
 352                 return 0;
 353         }
 354
 355         mutex_lock(&obj->dev->struct_mutex);
 356         ret = msm_gem_get_iova_locked(obj, id, iova);
 357         mutex_unlock(&obj->dev->struct_mutex);
 358         return ret;
 359 }
 360
 361 /* get iova without taking a reference, used in places where you have
 362  * already done a 'msm_gem_get_iova()'.
 363  */
 364 uint32_t msm_gem_iova(struct drm_gem_object *obj, int id)
 365 {
 366         struct msm_gem_object *msm_obj = to_msm_bo(obj);
 367         WARN_ON(!msm_obj->domain[id].iova);
 368         return msm_obj->domain[id].iova;
 369 }
 370
 371 void msm_gem_put_iova(struct drm_gem_object *obj, int id)
 372 {
 373         // XXX TODO ..
 374         // NOTE: probably don't need a _locked() version.. we wouldn't
 375         // normally unmap here, but instead just mark that it could be
 376         // unmapped (if the iova refcnt drops to zero), but then later
 377         // if another _get_iova_locked() fails we can start unmapping
 378         // things that are no longer needed..
 379 }
 380
 381 int msm_gem_dumb_create(struct drm_file *file, struct drm_device *dev,
 382                 struct drm_mode_create_dumb *args)
 383 {
 384         args->pitch = align_pitch(args->width, args->bpp);
 385         args->size  = PAGE_ALIGN(args->pitch * args->height);
 386         return msm_gem_new_handle(dev, file, args->size,
 387                         MSM_BO_SCANOUT | MSM_BO_WC, &args->handle);
 388 }
 389
 390 int msm_gem_dumb_map_offset(struct drm_file *file, struct drm_device *dev,
 391                 uint32_t handle, uint64_t *offset)
 392 {
 393         struct drm_gem_object *obj;
 394         int ret = 0;
 395
 396         /* GEM does all our handle to object mapping */
 397         obj = drm_gem_object_lookup(file, handle);
 398         if (obj == NULL) {
 399                 ret = -ENOENT;
 400                 goto fail;
 401         }
 402
 403         *offset = msm_gem_mmap_offset(obj);
 404
 405         drm_gem_object_unreference_unlocked(obj);
 406
 407 fail:
 408         return ret;
 409 }
 410
 411 void *msm_gem_get_vaddr_locked(struct drm_gem_object *obj)
 412 {
 413         struct msm_gem_object *msm_obj = to_msm_bo(obj);
 414         WARN_ON(!mutex_is_locked(&obj->dev->struct_mutex));
 415         if (!msm_obj->vaddr) {
 416                 struct page **pages = get_pages(obj);
 417                 if (IS_ERR(pages))
 418                         return ERR_CAST(pages);
 419                 msm_obj->vaddr = vmap(pages, obj->size >> PAGE_SHIFT,
 420                                 VM_MAP, pgprot_writecombine(PAGE_KERNEL));
 421                 if (msm_obj->vaddr == NULL)
 422                         return ERR_PTR(-ENOMEM);
 423         }
 424         msm_obj->vmap_count++;
 425         return msm_obj->vaddr;
 426 }
 427
 428 void *msm_gem_get_vaddr(struct drm_gem_object *obj)
 429 {
 430         void *ret;
 431         mutex_lock(&obj->dev->struct_mutex);
 432         ret = msm_gem_get_vaddr_locked(obj);
 433         mutex_unlock(&obj->dev->struct_mutex);
 434         return ret;
 435 }
 436
 437 void msm_gem_put_vaddr_locked(struct drm_gem_object *obj)
 438 {
 439         struct msm_gem_object *msm_obj = to_msm_bo(obj);
 440         WARN_ON(!mutex_is_locked(&obj->dev->struct_mutex));
 441         WARN_ON(msm_obj->vmap_count < 1);
 442         msm_obj->vmap_count--;
 443 }
 444
 445 void msm_gem_put_vaddr(struct drm_gem_object *obj)
 446 {
 447         mutex_lock(&obj->dev->struct_mutex);
 448         msm_gem_put_vaddr_locked(obj);
 449         mutex_unlock(&obj->dev->struct_mutex);
 450 }
 451
 452 /* Update madvise status, returns true if not purged, else
 453  * false or -errno.
 454  */
 455 int msm_gem_madvise(struct drm_gem_object *obj, unsigned madv)
 456 {
 457         struct msm_gem_object *msm_obj = to_msm_bo(obj);
 458
 459         WARN_ON(!mutex_is_locked(&obj->dev->struct_mutex));
 460
 461         if (msm_obj->madv != __MSM_MADV_PURGED)
 462                 msm_obj->madv = madv;
 463
 464         return (msm_obj->madv != __MSM_MADV_PURGED);
 465 }
 466
 467 void msm_gem_purge(struct drm_gem_object *obj)
 468 {
 469         struct drm_device *dev = obj->dev;
 470         struct msm_gem_object *msm_obj = to_msm_bo(obj);
 471
 472         WARN_ON(!mutex_is_locked(&dev->struct_mutex));
 473         WARN_ON(!is_purgeable(msm_obj));
 474         WARN_ON(obj->import_attach);
 475
 476         put_iova(obj);
 477
 478         msm_gem_vunmap(obj);
 479
 480         put_pages(obj);
 481
 482         msm_obj->madv = __MSM_MADV_PURGED;
 483
 484         drm_vma_node_unmap(&obj->vma_node, dev->anon_inode->i_mapping);
 485         drm_gem_free_mmap_offset(obj);
 486
 487         /* Our goal here is to return as much of the memory as
 488          * is possible back to the system as we are called from OOM.
 489          * To do this we must instruct the shmfs to drop all of its
 490          * backing pages, *now*.
 491          */
 492         shmem_truncate_range(file_inode(obj->filp), 0, (loff_t)-1);
 493
 494         invalidate_mapping_pages(file_inode(obj->filp)->i_mapping,
 495                         0, (loff_t)-1);
 496 }
 497
 498 void msm_gem_vunmap(struct drm_gem_object *obj)
 499 {
 500         struct msm_gem_object *msm_obj = to_msm_bo(obj);
 501
 502         if (!msm_obj->vaddr || WARN_ON(!is_vunmapable(msm_obj)))
 503                 return;
 504
 505         vunmap(msm_obj->vaddr);
 506         msm_obj->vaddr = NULL;
 507 }
 508
 509 /* must be called before _move_to_active().. */
 510 int msm_gem_sync_object(struct drm_gem_object *obj,
 511                 struct msm_fence_context *fctx, bool exclusive)
 512 {
 513         struct msm_gem_object *msm_obj = to_msm_bo(obj);
 514         struct reservation_object_list *fobj;
 515         struct fence *fence;
 516         int i, ret;
 517
 518         if (!exclusive) {
 519                 /* NOTE: _reserve_shared() must happen before _add_shared_fence(),
 520                  * which makes this a slightly strange place to call it.  OTOH this
 521                  * is a convenient can-fail point to hook it in.  (And similar to
 522                  * how etnaviv and nouveau handle this.)
 523                  */
 524                 ret = reservation_object_reserve_shared(msm_obj->resv);
 525                 if (ret)
 526                         return ret;
 527         }
 528
 529         fobj = reservation_object_get_list(msm_obj->resv);
 530         if (!fobj || (fobj->shared_count == 0)) {
 531                 fence = reservation_object_get_excl(msm_obj->resv);
 532                 /* don't need to wait on our own fences, since ring is fifo */
 533                 if (fence && (fence->context != fctx->context)) {
 534                         ret = fence_wait(fence, true);
 535                         if (ret)
 536                                 return ret;
 537                 }
 538         }
 539
 540         if (!exclusive || !fobj)
 541                 return 0;
 542
 543         for (i = 0; i < fobj->shared_count; i++) {
 544                 fence = rcu_dereference_protected(fobj->shared[i],
 545                                                 reservation_object_held(msm_obj->resv));
 546                 if (fence->context != fctx->context) {
 547                         ret = fence_wait(fence, true);
 548                         if (ret)
 549                                 return ret;
 550                 }
 551         }
 552
 553         return 0;
 554 }
 555
 556 void msm_gem_move_to_active(struct drm_gem_object *obj,
 557                 struct msm_gpu *gpu, bool exclusive, struct fence *fence)
 558 {
 559         struct msm_gem_object *msm_obj = to_msm_bo(obj);
 560         WARN_ON(msm_obj->madv != MSM_MADV_WILLNEED);
 561         msm_obj->gpu = gpu;
 562         if (exclusive)
 563                 reservation_object_add_excl_fence(msm_obj->resv, fence);
 564         else
 565                 reservation_object_add_shared_fence(msm_obj->resv, fence);
 566         list_del_init(&msm_obj->mm_list);
 567         list_add_tail(&msm_obj->mm_list, &gpu->active_list);
 568 }
 569
 570 void msm_gem_move_to_inactive(struct drm_gem_object *obj)
 571 {
 572         struct drm_device *dev = obj->dev;
 573         struct msm_drm_private *priv = dev->dev_private;
 574         struct msm_gem_object *msm_obj = to_msm_bo(obj);
 575
 576         WARN_ON(!mutex_is_locked(&dev->struct_mutex));
 577
 578         msm_obj->gpu = NULL;
 579         list_del_init(&msm_obj->mm_list);
 580         list_add_tail(&msm_obj->mm_list, &priv->inactive_list);
 581 }
 582
 583 int msm_gem_cpu_prep(struct drm_gem_object *obj, uint32_t op, ktime_t *timeout)
 584 {
 585         struct msm_gem_object *msm_obj = to_msm_bo(obj);
 586         bool write = !!(op & MSM_PREP_WRITE);
 587
 588         if (op & MSM_PREP_NOSYNC) {
 589                 if (!reservation_object_test_signaled_rcu(msm_obj->resv, write))
 590                         return -EBUSY;
 591         } else {
 592                 int ret;
 593
 594                 ret = reservation_object_wait_timeout_rcu(msm_obj->resv, write,
 595                                 true, timeout_to_jiffies(timeout));
 596                 if (ret <= 0)
 597                         return ret == 0 ? -ETIMEDOUT : ret;
 598         }
 599
 600         /* TODO cache maintenance */
 601
 602         return 0;
 603 }
 604
 605 int msm_gem_cpu_fini(struct drm_gem_object *obj)
 606 {
 607         /* TODO cache maintenance */
 608         return 0;
 609 }
 610
 611 #ifdef CONFIG_DEBUG_FS
 612 static void describe_fence(struct fence *fence, const char *type,
 613                 struct seq_file *m)
 614 {
 615         if (!fence_is_signaled(fence))
 616                 seq_printf(m, "\t%9s: %s %s seq %u\n", type,
 617                                 fence->ops->get_driver_name(fence),
 618                                 fence->ops->get_timeline_name(fence),
 619                                 fence->seqno);
 620 }
 621
 622 void msm_gem_describe(struct drm_gem_object *obj, struct seq_file *m)
 623 {
 624         struct msm_gem_object *msm_obj = to_msm_bo(obj);
 625         struct reservation_object *robj = msm_obj->resv;
 626         struct reservation_object_list *fobj;
 627         struct fence *fence;
 628         uint64_t off = drm_vma_node_start(&obj->vma_node);
 629         const char *madv;
 630
 631         WARN_ON(!mutex_is_locked(&obj->dev->struct_mutex));
 632
 633         switch (msm_obj->madv) {
 634         case __MSM_MADV_PURGED:
 635                 madv = " purged";
 636                 break;
 637         case MSM_MADV_DONTNEED:
 638                 madv = " purgeable";
 639                 break;
 640         case MSM_MADV_WILLNEED:
 641         default:
 642                 madv = "";
 643                 break;
 644         }
 645
 646         seq_printf(m, "%08x: %c %2d (%2d) %08llx %p %zu%s\n",
 647                         msm_obj->flags, is_active(msm_obj) ? 'A' : 'I',
 648                         obj->name, obj->refcount.refcount.counter,
 649                         off, msm_obj->vaddr, obj->size, madv);
 650
 651         rcu_read_lock();
 652         fobj = rcu_dereference(robj->fence);
 653         if (fobj) {
 654                 unsigned int i, shared_count = fobj->shared_count;
 655
 656                 for (i = 0; i < shared_count; i++) {
 657                         fence = rcu_dereference(fobj->shared[i]);
 658                         describe_fence(fence, "Shared", m);
 659                 }
 660         }
 661
 662         fence = rcu_dereference(robj->fence_excl);
 663         if (fence)
 664                 describe_fence(fence, "Exclusive", m);
 665         rcu_read_unlock();
 666 }
 667
 668 void msm_gem_describe_objects(struct list_head *list, struct seq_file *m)
 669 {
 670         struct msm_gem_object *msm_obj;
 671         int count = 0;
 672         size_t size = 0;
 673
 674         list_for_each_entry(msm_obj, list, mm_list) {
 675                 struct drm_gem_object *obj = &msm_obj->base;
 676                 seq_printf(m, "   ");
 677                 msm_gem_describe(obj, m);
 678                 count++;
 679                 size += obj->size;
 680         }
 681
 682         seq_printf(m, "Total %d objects, %zu bytes\n", count, size);
 683 }
 684 #endif
 685
 686 void msm_gem_free_object(struct drm_gem_object *obj)
 687 {
 688         struct drm_device *dev = obj->dev;
 689         struct msm_gem_object *msm_obj = to_msm_bo(obj);
 690
 691         WARN_ON(!mutex_is_locked(&dev->struct_mutex));
 692
 693         /* object should not be on active list: */
 694         WARN_ON(is_active(msm_obj));
 695
 696         list_del(&msm_obj->mm_list);
 697
 698         put_iova(obj);
 699
 700         if (obj->import_attach) {
 701                 if (msm_obj->vaddr)
 702                         dma_buf_vunmap(obj->import_attach->dmabuf, msm_obj->vaddr);
 703
 704                 /* Don't drop the pages for imported dmabuf, as they are not
 705                  * ours, just free the array we allocated:
 706                  */
 707                 if (msm_obj->pages)
 708                         drm_free_large(msm_obj->pages);
 709
 710                 drm_prime_gem_destroy(obj, msm_obj->sgt);
 711         } else {
 712                 msm_gem_vunmap(obj);
 713                 put_pages(obj);
 714         }
 715
 716         if (msm_obj->resv == &msm_obj->_resv)
 717                 reservation_object_fini(msm_obj->resv);
 718
 719         drm_gem_object_release(obj);
 720
 721         kfree(msm_obj);
 722 }
 723
 724 /* convenience method to construct a GEM buffer object, and userspace handle */
 725 int msm_gem_new_handle(struct drm_device *dev, struct drm_file *file,
 726                 uint32_t size, uint32_t flags, uint32_t *handle)
 727 {
 728         struct drm_gem_object *obj;
 729         int ret;
 730
 731         ret = mutex_lock_interruptible(&dev->struct_mutex);
 732         if (ret)
 733                 return ret;
 734
 735         obj = msm_gem_new(dev, size, flags);
 736
 737         mutex_unlock(&dev->struct_mutex);
 738
 739         if (IS_ERR(obj))
 740                 return PTR_ERR(obj);
 741
 742         ret = drm_gem_handle_create(file, obj, handle);
 743
 744         /* drop reference from allocate - handle holds it now */
 745         drm_gem_object_unreference_unlocked(obj);
 746
 747         return ret;
 748 }
 749
 750 static int msm_gem_new_impl(struct drm_device *dev,
 751                 uint32_t size, uint32_t flags,
 752                 struct reservation_object *resv,
 753                 struct drm_gem_object **obj)
 754 {
 755         struct msm_drm_private *priv = dev->dev_private;
 756         struct msm_gem_object *msm_obj;
 757         unsigned sz;
 758         bool use_vram = false;
 759
 760         switch (flags & MSM_BO_CACHE_MASK) {
 761         case MSM_BO_UNCACHED:
 762         case MSM_BO_CACHED:
 763         case MSM_BO_WC:
 764                 break;
 765         default:
 766                 dev_err(dev->dev, "invalid cache flag: %x\n",
 767                                 (flags & MSM_BO_CACHE_MASK));
 768                 return -EINVAL;
 769         }
 770
 771         if (!iommu_present(&platform_bus_type))
 772                 use_vram = true;
 773         else if ((flags & MSM_BO_STOLEN) && priv->vram.size)
 774                 use_vram = true;
 775
 776         if (WARN_ON(use_vram && !priv->vram.size))
 777                 return -EINVAL;
 778
 779         sz = sizeof(*msm_obj);
 780         if (use_vram)
 781                 sz += sizeof(struct drm_mm_node);
 782
 783         msm_obj = kzalloc(sz, GFP_KERNEL);
 784         if (!msm_obj)
 785                 return -ENOMEM;
 786
 787         if (use_vram)
 788                 msm_obj->vram_node = (void *)&msm_obj[1];
 789
 790         msm_obj->flags = flags;
 791         msm_obj->madv = MSM_MADV_WILLNEED;
 792
 793         if (resv) {
 794                 msm_obj->resv = resv;
 795         } else {
 796                 msm_obj->resv = &msm_obj->_resv;
 797                 reservation_object_init(msm_obj->resv);
 798         }
 799
 800         INIT_LIST_HEAD(&msm_obj->submit_entry);
 801         list_add_tail(&msm_obj->mm_list, &priv->inactive_list);
 802
 803         *obj = &msm_obj->base;
 804
 805         return 0;
 806 }
 807
 808 struct drm_gem_object *msm_gem_new(struct drm_device *dev,
 809                 uint32_t size, uint32_t flags)
 810 {
 811         struct drm_gem_object *obj = NULL;
 812         int ret;
 813
 814         WARN_ON(!mutex_is_locked(&dev->struct_mutex));
 815
 816         size = PAGE_ALIGN(size);
 817
 818         ret = msm_gem_new_impl(dev, size, flags, NULL, &obj);
 819         if (ret)
 820                 goto fail;
 821
 822         if (use_pages(obj)) {
 823                 ret = drm_gem_object_init(dev, obj, size);
 824                 if (ret)
 825                         goto fail;
 826         } else {
 827                 drm_gem_private_object_init(dev, obj, size);
 828         }
 829
 830         return obj;
 831
 832 fail:
 833         drm_gem_object_unreference(obj);
 834         return ERR_PTR(ret);
 835 }
 836
 837 struct drm_gem_object *msm_gem_import(struct drm_device *dev,
 838                 struct dma_buf *dmabuf, struct sg_table *sgt)
 839 {
 840         struct msm_gem_object *msm_obj;
 841         struct drm_gem_object *obj;
 842         uint32_t size;
 843         int ret, npages;
 844
 845         /* if we don't have IOMMU, don't bother pretending we can import: */
 846         if (!iommu_present(&platform_bus_type)) {
 847                 dev_err(dev->dev, "cannot import without IOMMU\n");
 848                 return ERR_PTR(-EINVAL);
 849         }
 850
 851         size = PAGE_ALIGN(dmabuf->size);
 852
 853         ret = msm_gem_new_impl(dev, size, MSM_BO_WC, dmabuf->resv, &obj);
 854         if (ret)
 855                 goto fail;
 856
 857         drm_gem_private_object_init(dev, obj, size);
 858
 859         npages = size / PAGE_SIZE;
 860
 861         msm_obj = to_msm_bo(obj);
 862         msm_obj->sgt = sgt;
 863         msm_obj->pages = drm_malloc_ab(npages, sizeof(struct page *));
 864         if (!msm_obj->pages) {
 865                 ret = -ENOMEM;
 866                 goto fail;
 867         }
 868
 869         ret = drm_prime_sg_to_page_addr_arrays(sgt, msm_obj->pages, NULL, npages);
 870         if (ret)
 871                 goto fail;
 872
 873         return obj;
 874
 875 fail:
 876         drm_gem_object_unreference_unlocked(obj);
 877         return ERR_PTR(ret);
 878 }