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, npages);
  58         if (ret) {
  59                 drm_free_large(p);
  60                 return ERR_PTR(ret);
  61         }
  62
  63         paddr = physaddr(obj);
  64         for (i = 0; i < npages; i++) {
  65                 p[i] = phys_to_page(paddr);
  66                 paddr += PAGE_SIZE;
  67         }
  68
  69         return p;
  70 }
  71
  72 /* called with dev->struct_mutex held */
  73 static struct page **get_pages(struct drm_gem_object *obj)
  74 {
  75         struct msm_gem_object *msm_obj = to_msm_bo(obj);
  76
  77         if (!msm_obj->pages) {
  78                 struct drm_device *dev = obj->dev;
  79                 struct page **p;
  80                 int npages = obj->size >> PAGE_SHIFT;
  81
  82                 if (use_pages(obj))
  83                         p = drm_gem_get_pages(obj);
  84                 else
  85                         p = get_pages_vram(obj, npages);
  86
  87                 if (IS_ERR(p)) {
  88                         dev_err(dev->dev, "could not get pages: %ld\n",
  89                                         PTR_ERR(p));
  90                         return p;
  91                 }
  92
  93                 msm_obj->sgt = drm_prime_pages_to_sg(p, npages);
  94                 if (IS_ERR(msm_obj->sgt)) {
  95                         dev_err(dev->dev, "failed to allocate sgt\n");
  96                         return ERR_CAST(msm_obj->sgt);
  97                 }
  98
  99                 msm_obj->pages = p;
 100
 101                 /* For non-cached buffers, ensure the new pages are clean
 102                  * because display controller, GPU, etc. are not coherent:
 103                  */
 104                 if (msm_obj->flags & (MSM_BO_WC|MSM_BO_UNCACHED))
 105                         dma_map_sg(dev->dev, msm_obj->sgt->sgl,
 106                                         msm_obj->sgt->nents, DMA_BIDIRECTIONAL);
 107         }
 108
 109         return msm_obj->pages;
 110 }
 111
 112 static void put_pages(struct drm_gem_object *obj)
 113 {
 114         struct msm_gem_object *msm_obj = to_msm_bo(obj);
 115
 116         if (msm_obj->pages) {
 117                 /* For non-cached buffers, ensure the new pages are clean
 118                  * because display controller, GPU, etc. are not coherent:
 119                  */
 120                 if (msm_obj->flags & (MSM_BO_WC|MSM_BO_UNCACHED))
 121                         dma_unmap_sg(obj->dev->dev, msm_obj->sgt->sgl,
 122                                         msm_obj->sgt->nents, DMA_BIDIRECTIONAL);
 123                 sg_free_table(msm_obj->sgt);
 124                 kfree(msm_obj->sgt);
 125
 126                 if (use_pages(obj))
 127                         drm_gem_put_pages(obj, msm_obj->pages, true, false);
 128                 else {
 129                         drm_mm_remove_node(msm_obj->vram_node);
 130                         drm_free_large(msm_obj->pages);
 131                 }
 132
 133                 msm_obj->pages = NULL;
 134         }
 135 }
 136
 137 struct page **msm_gem_get_pages(struct drm_gem_object *obj)
 138 {
 139         struct drm_device *dev = obj->dev;
 140         struct page **p;
 141         mutex_lock(&dev->struct_mutex);
 142         p = get_pages(obj);
 143         mutex_unlock(&dev->struct_mutex);
 144         return p;
 145 }
 146
 147 void msm_gem_put_pages(struct drm_gem_object *obj)
 148 {
 149         /* when we start tracking the pin count, then do something here */
 150 }
 151
 152 int msm_gem_mmap_obj(struct drm_gem_object *obj,
 153                 struct vm_area_struct *vma)
 154 {
 155         struct msm_gem_object *msm_obj = to_msm_bo(obj);
 156
 157         vma->vm_flags &= ~VM_PFNMAP;
 158         vma->vm_flags |= VM_MIXEDMAP;
 159
 160         if (msm_obj->flags & MSM_BO_WC) {
 161                 vma->vm_page_prot = pgprot_writecombine(vm_get_page_prot(vma->vm_flags));
 162         } else if (msm_obj->flags & MSM_BO_UNCACHED) {
 163                 vma->vm_page_prot = pgprot_noncached(vm_get_page_prot(vma->vm_flags));
 164         } else {
 165                 /*
 166                  * Shunt off cached objs to shmem file so they have their own
 167                  * address_space (so unmap_mapping_range does what we want,
 168                  * in particular in the case of mmap'd dmabufs)
 169                  */
 170                 fput(vma->vm_file);
 171                 get_file(obj->filp);
 172                 vma->vm_pgoff = 0;
 173                 vma->vm_file  = obj->filp;
 174
 175                 vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
 176         }
 177
 178         return 0;
 179 }
 180
 181 int msm_gem_mmap(struct file *filp, struct vm_area_struct *vma)
 182 {
 183         int ret;
 184
 185         ret = drm_gem_mmap(filp, vma);
 186         if (ret) {
 187                 DBG("mmap failed: %d", ret);
 188                 return ret;
 189         }
 190
 191         return msm_gem_mmap_obj(vma->vm_private_data, vma);
 192 }
 193
 194 int msm_gem_fault(struct vm_fault *vmf)
 195 {
 196         struct vm_area_struct *vma = vmf->vma;
 197         struct drm_gem_object *obj = vma->vm_private_data;
 198         struct drm_device *dev = obj->dev;
 199         struct msm_drm_private *priv = dev->dev_private;
 200         struct page **pages;
 201         unsigned long pfn;
 202         pgoff_t pgoff;
 203         int ret;
 204
 205         /* This should only happen if userspace tries to pass a mmap'd
 206          * but unfaulted gem bo vaddr into submit ioctl, triggering
 207          * a page fault while struct_mutex is already held.  This is
 208          * not a valid use-case so just bail.
 209          */
 210         if (priv->struct_mutex_task == current)
 211                 return VM_FAULT_SIGBUS;
 212
 213         /* Make sure we don't parallel update on a fault, nor move or remove
 214          * something from beneath our feet
 215          */
 216         ret = mutex_lock_interruptible(&dev->struct_mutex);
 217         if (ret)
 218                 goto out;
 219
 220         /* make sure we have pages attached now */
 221         pages = get_pages(obj);
 222         if (IS_ERR(pages)) {
 223                 ret = PTR_ERR(pages);
 224                 goto out_unlock;
 225         }
 226
 227         /* We don't use vmf->pgoff since that has the fake offset: */
 228         pgoff = (vmf->address - vma->vm_start) >> PAGE_SHIFT;
 229
 230         pfn = page_to_pfn(pages[pgoff]);
 231
 232         VERB("Inserting %p pfn %lx, pa %lx", (void *)vmf->address,
 233                         pfn, pfn << PAGE_SHIFT);
 234
 235         ret = vm_insert_mixed(vma, vmf->address, __pfn_to_pfn_t(pfn, PFN_DEV));
 236
 237 out_unlock:
 238         mutex_unlock(&dev->struct_mutex);
 239 out:
 240         switch (ret) {
 241         case -EAGAIN:
 242         case 0:
 243         case -ERESTARTSYS:
 244         case -EINTR:
 245         case -EBUSY:
 246                 /*
 247                  * EBUSY is ok: this just means that another thread
 248                  * already did the job.
 249                  */
 250                 return VM_FAULT_NOPAGE;
 251         case -ENOMEM:
 252                 return VM_FAULT_OOM;
 253         default:
 254                 return VM_FAULT_SIGBUS;
 255         }
 256 }
 257
 258 /** get mmap offset */
 259 static uint64_t mmap_offset(struct drm_gem_object *obj)
 260 {
 261         struct drm_device *dev = obj->dev;
 262         int ret;
 263
 264         WARN_ON(!mutex_is_locked(&dev->struct_mutex));
 265
 266         /* Make it mmapable */
 267         ret = drm_gem_create_mmap_offset(obj);
 268
 269         if (ret) {
 270                 dev_err(dev->dev, "could not allocate mmap offset\n");
 271                 return 0;
 272         }
 273
 274         return drm_vma_node_offset_addr(&obj->vma_node);
 275 }
 276
 277 uint64_t msm_gem_mmap_offset(struct drm_gem_object *obj)
 278 {
 279         uint64_t offset;
 280         mutex_lock(&obj->dev->struct_mutex);
 281         offset = mmap_offset(obj);
 282         mutex_unlock(&obj->dev->struct_mutex);
 283         return offset;
 284 }
 285
 286 static void
 287 put_iova(struct drm_gem_object *obj)
 288 {
 289         struct drm_device *dev = obj->dev;
 290         struct msm_drm_private *priv = obj->dev->dev_private;
 291         struct msm_gem_object *msm_obj = to_msm_bo(obj);
 292         int id;
 293
 294         WARN_ON(!mutex_is_locked(&dev->struct_mutex));
 295
 296         for (id = 0; id < ARRAY_SIZE(msm_obj->domain); id++) {
 297                 if (!priv->aspace[id])
 298                         continue;
 299                 msm_gem_unmap_vma(priv->aspace[id],
 300                                 &msm_obj->domain[id], msm_obj->sgt);
 301         }
 302 }
 303
 304 /* should be called under struct_mutex.. although it can be called
 305  * from atomic context without struct_mutex to acquire an extra
 306  * iova ref if you know one is already held.
 307  *
 308  * That means when I do eventually need to add support for unpinning
 309  * the refcnt counter needs to be atomic_t.
 310  */
 311 int msm_gem_get_iova_locked(struct drm_gem_object *obj, int id,
 312                 uint64_t *iova)
 313 {
 314         struct msm_gem_object *msm_obj = to_msm_bo(obj);
 315         int ret = 0;
 316
 317         if (!msm_obj->domain[id].iova) {
 318                 struct msm_drm_private *priv = obj->dev->dev_private;
 319                 struct page **pages = get_pages(obj);
 320
 321                 if (IS_ERR(pages))
 322                         return PTR_ERR(pages);
 323
 324                 if (iommu_present(&platform_bus_type)) {
 325                         ret = msm_gem_map_vma(priv->aspace[id], &msm_obj->domain[id],
 326                                         msm_obj->sgt, obj->size >> PAGE_SHIFT);
 327                 } else {
 328                         msm_obj->domain[id].iova = physaddr(obj);
 329                 }
 330         }
 331
 332         if (!ret)
 333                 *iova = msm_obj->domain[id].iova;
 334
 335         return ret;
 336 }
 337
 338 /* get iova, taking a reference.  Should have a matching put */
 339 int msm_gem_get_iova(struct drm_gem_object *obj, int id, uint64_t *iova)
 340 {
 341         struct msm_gem_object *msm_obj = to_msm_bo(obj);
 342         int ret;
 343
 344         /* this is safe right now because we don't unmap until the
 345          * bo is deleted:
 346          */
 347         if (msm_obj->domain[id].iova) {
 348                 *iova = msm_obj->domain[id].iova;
 349                 return 0;
 350         }
 351
 352         mutex_lock(&obj->dev->struct_mutex);
 353         ret = msm_gem_get_iova_locked(obj, id, iova);
 354         mutex_unlock(&obj->dev->struct_mutex);
 355         return ret;
 356 }
 357
 358 /* get iova without taking a reference, used in places where you have
 359  * already done a 'msm_gem_get_iova()'.
 360  */
 361 uint64_t msm_gem_iova(struct drm_gem_object *obj, int id)
 362 {
 363         struct msm_gem_object *msm_obj = to_msm_bo(obj);
 364         WARN_ON(!msm_obj->domain[id].iova);
 365         return msm_obj->domain[id].iova;
 366 }
 367
 368 void msm_gem_put_iova(struct drm_gem_object *obj, int id)
 369 {
 370         // XXX TODO ..
 371         // NOTE: probably don't need a _locked() version.. we wouldn't
 372         // normally unmap here, but instead just mark that it could be
 373         // unmapped (if the iova refcnt drops to zero), but then later
 374         // if another _get_iova_locked() fails we can start unmapping
 375         // things that are no longer needed..
 376 }
 377
 378 int msm_gem_dumb_create(struct drm_file *file, struct drm_device *dev,
 379                 struct drm_mode_create_dumb *args)
 380 {
 381         args->pitch = align_pitch(args->width, args->bpp);
 382         args->size  = PAGE_ALIGN(args->pitch * args->height);
 383         return msm_gem_new_handle(dev, file, args->size,
 384                         MSM_BO_SCANOUT | MSM_BO_WC, &args->handle);
 385 }
 386
 387 int msm_gem_dumb_map_offset(struct drm_file *file, struct drm_device *dev,
 388                 uint32_t handle, uint64_t *offset)
 389 {
 390         struct drm_gem_object *obj;
 391         int ret = 0;
 392
 393         /* GEM does all our handle to object mapping */
 394         obj = drm_gem_object_lookup(file, handle);
 395         if (obj == NULL) {
 396                 ret = -ENOENT;
 397                 goto fail;
 398         }
 399
 400         *offset = msm_gem_mmap_offset(obj);
 401
 402         drm_gem_object_unreference_unlocked(obj);
 403
 404 fail:
 405         return ret;
 406 }
 407
 408 void *msm_gem_get_vaddr_locked(struct drm_gem_object *obj)
 409 {
 410         struct msm_gem_object *msm_obj = to_msm_bo(obj);
 411         WARN_ON(!mutex_is_locked(&obj->dev->struct_mutex));
 412         if (!msm_obj->vaddr) {
 413                 struct page **pages = get_pages(obj);
 414                 if (IS_ERR(pages))
 415                         return ERR_CAST(pages);
 416                 msm_obj->vaddr = vmap(pages, obj->size >> PAGE_SHIFT,
 417                                 VM_MAP, pgprot_writecombine(PAGE_KERNEL));
 418                 if (msm_obj->vaddr == NULL)
 419                         return ERR_PTR(-ENOMEM);
 420         }
 421         msm_obj->vmap_count++;
 422         return msm_obj->vaddr;
 423 }
 424
 425 void *msm_gem_get_vaddr(struct drm_gem_object *obj)
 426 {
 427         void *ret;
 428         mutex_lock(&obj->dev->struct_mutex);
 429         ret = msm_gem_get_vaddr_locked(obj);
 430         mutex_unlock(&obj->dev->struct_mutex);
 431         return ret;
 432 }
 433
 434 void msm_gem_put_vaddr_locked(struct drm_gem_object *obj)
 435 {
 436         struct msm_gem_object *msm_obj = to_msm_bo(obj);
 437         WARN_ON(!mutex_is_locked(&obj->dev->struct_mutex));
 438         WARN_ON(msm_obj->vmap_count < 1);
 439         msm_obj->vmap_count--;
 440 }
 441
 442 void msm_gem_put_vaddr(struct drm_gem_object *obj)
 443 {
 444         mutex_lock(&obj->dev->struct_mutex);
 445         msm_gem_put_vaddr_locked(obj);
 446         mutex_unlock(&obj->dev->struct_mutex);
 447 }
 448
 449 /* Update madvise status, returns true if not purged, else
 450  * false or -errno.
 451  */
 452 int msm_gem_madvise(struct drm_gem_object *obj, unsigned madv)
 453 {
 454         struct msm_gem_object *msm_obj = to_msm_bo(obj);
 455
 456         WARN_ON(!mutex_is_locked(&obj->dev->struct_mutex));
 457
 458         if (msm_obj->madv != __MSM_MADV_PURGED)
 459                 msm_obj->madv = madv;
 460
 461         return (msm_obj->madv != __MSM_MADV_PURGED);
 462 }
 463
 464 void msm_gem_purge(struct drm_gem_object *obj)
 465 {
 466         struct drm_device *dev = obj->dev;
 467         struct msm_gem_object *msm_obj = to_msm_bo(obj);
 468
 469         WARN_ON(!mutex_is_locked(&dev->struct_mutex));
 470         WARN_ON(!is_purgeable(msm_obj));
 471         WARN_ON(obj->import_attach);
 472
 473         put_iova(obj);
 474
 475         msm_gem_vunmap(obj);
 476
 477         put_pages(obj);
 478
 479         msm_obj->madv = __MSM_MADV_PURGED;
 480
 481         drm_vma_node_unmap(&obj->vma_node, dev->anon_inode->i_mapping);
 482         drm_gem_free_mmap_offset(obj);
 483
 484         /* Our goal here is to return as much of the memory as
 485          * is possible back to the system as we are called from OOM.
 486          * To do this we must instruct the shmfs to drop all of its
 487          * backing pages, *now*.
 488          */
 489         shmem_truncate_range(file_inode(obj->filp), 0, (loff_t)-1);
 490
 491         invalidate_mapping_pages(file_inode(obj->filp)->i_mapping,
 492                         0, (loff_t)-1);
 493 }
 494
 495 void msm_gem_vunmap(struct drm_gem_object *obj)
 496 {
 497         struct msm_gem_object *msm_obj = to_msm_bo(obj);
 498
 499         if (!msm_obj->vaddr || WARN_ON(!is_vunmapable(msm_obj)))
 500                 return;
 501
 502         vunmap(msm_obj->vaddr);
 503         msm_obj->vaddr = NULL;
 504 }
 505
 506 /* must be called before _move_to_active().. */
 507 int msm_gem_sync_object(struct drm_gem_object *obj,
 508                 struct msm_fence_context *fctx, bool exclusive)
 509 {
 510         struct msm_gem_object *msm_obj = to_msm_bo(obj);
 511         struct reservation_object_list *fobj;
 512         struct dma_fence *fence;
 513         int i, ret;
 514
 515         if (!exclusive) {
 516                 /* NOTE: _reserve_shared() must happen before _add_shared_fence(),
 517                  * which makes this a slightly strange place to call it.  OTOH this
 518                  * is a convenient can-fail point to hook it in.  (And similar to
 519                  * how etnaviv and nouveau handle this.)
 520                  */
 521                 ret = reservation_object_reserve_shared(msm_obj->resv);
 522                 if (ret)
 523                         return ret;
 524         }
 525
 526         fobj = reservation_object_get_list(msm_obj->resv);
 527         if (!fobj || (fobj->shared_count == 0)) {
 528                 fence = reservation_object_get_excl(msm_obj->resv);
 529                 /* don't need to wait on our own fences, since ring is fifo */
 530                 if (fence && (fence->context != fctx->context)) {
 531                         ret = dma_fence_wait(fence, true);
 532                         if (ret)
 533                                 return ret;
 534                 }
 535         }
 536
 537         if (!exclusive || !fobj)
 538                 return 0;
 539
 540         for (i = 0; i < fobj->shared_count; i++) {
 541                 fence = rcu_dereference_protected(fobj->shared[i],
 542                                                 reservation_object_held(msm_obj->resv));
 543                 if (fence->context != fctx->context) {
 544                         ret = dma_fence_wait(fence, true);
 545                         if (ret)
 546                                 return ret;
 547                 }
 548         }
 549
 550         return 0;
 551 }
 552
 553 void msm_gem_move_to_active(struct drm_gem_object *obj,
 554                 struct msm_gpu *gpu, bool exclusive, struct dma_fence *fence)
 555 {
 556         struct msm_gem_object *msm_obj = to_msm_bo(obj);
 557         WARN_ON(msm_obj->madv != MSM_MADV_WILLNEED);
 558         msm_obj->gpu = gpu;
 559         if (exclusive)
 560                 reservation_object_add_excl_fence(msm_obj->resv, fence);
 561         else
 562                 reservation_object_add_shared_fence(msm_obj->resv, fence);
 563         list_del_init(&msm_obj->mm_list);
 564         list_add_tail(&msm_obj->mm_list, &gpu->active_list);
 565 }
 566
 567 void msm_gem_move_to_inactive(struct drm_gem_object *obj)
 568 {
 569         struct drm_device *dev = obj->dev;
 570         struct msm_drm_private *priv = dev->dev_private;
 571         struct msm_gem_object *msm_obj = to_msm_bo(obj);
 572
 573         WARN_ON(!mutex_is_locked(&dev->struct_mutex));
 574
 575         msm_obj->gpu = NULL;
 576         list_del_init(&msm_obj->mm_list);
 577         list_add_tail(&msm_obj->mm_list, &priv->inactive_list);
 578 }
 579
 580 int msm_gem_cpu_prep(struct drm_gem_object *obj, uint32_t op, ktime_t *timeout)
 581 {
 582         struct msm_gem_object *msm_obj = to_msm_bo(obj);
 583         bool write = !!(op & MSM_PREP_WRITE);
 584         unsigned long remain =
 585                 op & MSM_PREP_NOSYNC ? 0 : timeout_to_jiffies(timeout);
 586         long ret;
 587
 588         ret = reservation_object_wait_timeout_rcu(msm_obj->resv, write,
 589                                                   true,  remain);
 590         if (ret == 0)
 591                 return remain == 0 ? -EBUSY : -ETIMEDOUT;
 592         else if (ret < 0)
 593                 return ret;
 594
 595         /* TODO cache maintenance */
 596
 597         return 0;
 598 }
 599
 600 int msm_gem_cpu_fini(struct drm_gem_object *obj)
 601 {
 602         /* TODO cache maintenance */
 603         return 0;
 604 }
 605
 606 #ifdef CONFIG_DEBUG_FS
 607 static void describe_fence(struct dma_fence *fence, const char *type,
 608                 struct seq_file *m)
 609 {
 610         if (!dma_fence_is_signaled(fence))
 611                 seq_printf(m, "\t%9s: %s %s seq %u\n", type,
 612                                 fence->ops->get_driver_name(fence),
 613                                 fence->ops->get_timeline_name(fence),
 614                                 fence->seqno);
 615 }
 616
 617 void msm_gem_describe(struct drm_gem_object *obj, struct seq_file *m)
 618 {
 619         struct msm_gem_object *msm_obj = to_msm_bo(obj);
 620         struct reservation_object *robj = msm_obj->resv;
 621         struct reservation_object_list *fobj;
 622         struct msm_drm_private *priv = obj->dev->dev_private;
 623         struct dma_fence *fence;
 624         uint64_t off = drm_vma_node_start(&obj->vma_node);
 625         const char *madv;
 626         unsigned id;
 627
 628         WARN_ON(!mutex_is_locked(&obj->dev->struct_mutex));
 629
 630         switch (msm_obj->madv) {
 631         case __MSM_MADV_PURGED:
 632                 madv = " purged";
 633                 break;
 634         case MSM_MADV_DONTNEED:
 635                 madv = " purgeable";
 636                 break;
 637         case MSM_MADV_WILLNEED:
 638         default:
 639                 madv = "";
 640                 break;
 641         }
 642
 643         seq_printf(m, "%08x: %c %2d (%2d) %08llx %p\t",
 644                         msm_obj->flags, is_active(msm_obj) ? 'A' : 'I',
 645                         obj->name, kref_read(&obj->refcount),
 646                         off, msm_obj->vaddr);
 647
 648         for (id = 0; id < priv->num_aspaces; id++)
 649                 seq_printf(m, " %08llx", msm_obj->domain[id].iova);
 650
 651         seq_printf(m, " %zu%s\n", obj->size, madv);
 652
 653         rcu_read_lock();
 654         fobj = rcu_dereference(robj->fence);
 655         if (fobj) {
 656                 unsigned int i, shared_count = fobj->shared_count;
 657
 658                 for (i = 0; i < shared_count; i++) {
 659                         fence = rcu_dereference(fobj->shared[i]);
 660                         describe_fence(fence, "Shared", m);
 661                 }
 662         }
 663
 664         fence = rcu_dereference(robj->fence_excl);
 665         if (fence)
 666                 describe_fence(fence, "Exclusive", m);
 667         rcu_read_unlock();
 668 }
 669
 670 void msm_gem_describe_objects(struct list_head *list, struct seq_file *m)
 671 {
 672         struct msm_gem_object *msm_obj;
 673         int count = 0;
 674         size_t size = 0;
 675
 676         list_for_each_entry(msm_obj, list, mm_list) {
 677                 struct drm_gem_object *obj = &msm_obj->base;
 678                 seq_printf(m, "   ");
 679                 msm_gem_describe(obj, m);
 680                 count++;
 681                 size += obj->size;
 682         }
 683
 684         seq_printf(m, "Total %d objects, %zu bytes\n", count, size);
 685 }
 686 #endif
 687
 688 void msm_gem_free_object(struct drm_gem_object *obj)
 689 {
 690         struct drm_device *dev = obj->dev;
 691         struct msm_gem_object *msm_obj = to_msm_bo(obj);
 692
 693         WARN_ON(!mutex_is_locked(&dev->struct_mutex));
 694
 695         /* object should not be on active list: */
 696         WARN_ON(is_active(msm_obj));
 697
 698         list_del(&msm_obj->mm_list);
 699
 700         put_iova(obj);
 701
 702         if (obj->import_attach) {
 703                 if (msm_obj->vaddr)
 704                         dma_buf_vunmap(obj->import_attach->dmabuf, msm_obj->vaddr);
 705
 706                 /* Don't drop the pages for imported dmabuf, as they are not
 707                  * ours, just free the array we allocated:
 708                  */
 709                 if (msm_obj->pages)
 710                         drm_free_large(msm_obj->pages);
 711
 712                 drm_prime_gem_destroy(obj, msm_obj->sgt);
 713         } else {
 714                 msm_gem_vunmap(obj);
 715                 put_pages(obj);
 716         }
 717
 718         if (msm_obj->resv == &msm_obj->_resv)
 719                 reservation_object_fini(msm_obj->resv);
 720
 721         drm_gem_object_release(obj);
 722
 723         kfree(msm_obj);
 724 }
 725
 726 /* convenience method to construct a GEM buffer object, and userspace handle */
 727 int msm_gem_new_handle(struct drm_device *dev, struct drm_file *file,
 728                 uint32_t size, uint32_t flags, uint32_t *handle)
 729 {
 730         struct drm_gem_object *obj;
 731         int ret;
 732
 733         ret = mutex_lock_interruptible(&dev->struct_mutex);
 734         if (ret)
 735                 return ret;
 736
 737         obj = msm_gem_new(dev, size, flags);
 738
 739         mutex_unlock(&dev->struct_mutex);
 740
 741         if (IS_ERR(obj))
 742                 return PTR_ERR(obj);
 743
 744         ret = drm_gem_handle_create(file, obj, handle);
 745
 746         /* drop reference from allocate - handle holds it now */
 747         drm_gem_object_unreference_unlocked(obj);
 748
 749         return ret;
 750 }
 751
 752 static int msm_gem_new_impl(struct drm_device *dev,
 753                 uint32_t size, uint32_t flags,
 754                 struct reservation_object *resv,
 755                 struct drm_gem_object **obj)
 756 {
 757         struct msm_drm_private *priv = dev->dev_private;
 758         struct msm_gem_object *msm_obj;
 759         bool use_vram = false;
 760
 761         switch (flags & MSM_BO_CACHE_MASK) {
 762         case MSM_BO_UNCACHED:
 763         case MSM_BO_CACHED:
 764         case MSM_BO_WC:
 765                 break;
 766         default:
 767                 dev_err(dev->dev, "invalid cache flag: %x\n",
 768                                 (flags & MSM_BO_CACHE_MASK));
 769                 return -EINVAL;
 770         }
 771
 772         if (!iommu_present(&platform_bus_type))
 773                 use_vram = true;
 774         else if ((flags & MSM_BO_STOLEN) && priv->vram.size)
 775                 use_vram = true;
 776
 777         if (WARN_ON(use_vram && !priv->vram.size))
 778                 return -EINVAL;
 779
 780         msm_obj = kzalloc(sizeof(*msm_obj), GFP_KERNEL);
 781         if (!msm_obj)
 782                 return -ENOMEM;
 783
 784         if (use_vram)
 785                 msm_obj->vram_node = &msm_obj->domain[0].node;
 786
 787         msm_obj->flags = flags;
 788         msm_obj->madv = MSM_MADV_WILLNEED;
 789
 790         if (resv) {
 791                 msm_obj->resv = resv;
 792         } else {
 793                 msm_obj->resv = &msm_obj->_resv;
 794                 reservation_object_init(msm_obj->resv);
 795         }
 796
 797         INIT_LIST_HEAD(&msm_obj->submit_entry);
 798         list_add_tail(&msm_obj->mm_list, &priv->inactive_list);
 799
 800         *obj = &msm_obj->base;
 801
 802         return 0;
 803 }
 804
 805 struct drm_gem_object *msm_gem_new(struct drm_device *dev,
 806                 uint32_t size, uint32_t flags)
 807 {
 808         struct drm_gem_object *obj = NULL;
 809         int ret;
 810
 811         WARN_ON(!mutex_is_locked(&dev->struct_mutex));
 812
 813         size = PAGE_ALIGN(size);
 814
 815         /* Disallow zero sized objects as they make the underlying
 816          * infrastructure grumpy
 817          */
 818         if (size == 0)
 819                 return ERR_PTR(-EINVAL);
 820
 821         ret = msm_gem_new_impl(dev, size, flags, NULL, &obj);
 822         if (ret)
 823                 goto fail;
 824
 825         if (use_pages(obj)) {
 826                 ret = drm_gem_object_init(dev, obj, size);
 827                 if (ret)
 828                         goto fail;
 829         } else {
 830                 drm_gem_private_object_init(dev, obj, size);
 831         }
 832
 833         return obj;
 834
 835 fail:
 836         drm_gem_object_unreference(obj);
 837         return ERR_PTR(ret);
 838 }
 839
 840 struct drm_gem_object *msm_gem_import(struct drm_device *dev,
 841                 struct dma_buf *dmabuf, struct sg_table *sgt)
 842 {
 843         struct msm_gem_object *msm_obj;
 844         struct drm_gem_object *obj;
 845         uint32_t size;
 846         int ret, npages;
 847
 848         /* if we don't have IOMMU, don't bother pretending we can import: */
 849         if (!iommu_present(&platform_bus_type)) {
 850                 dev_err(dev->dev, "cannot import without IOMMU\n");
 851                 return ERR_PTR(-EINVAL);
 852         }
 853
 854         size = PAGE_ALIGN(dmabuf->size);
 855
 856         ret = msm_gem_new_impl(dev, size, MSM_BO_WC, dmabuf->resv, &obj);
 857         if (ret)
 858                 goto fail;
 859
 860         drm_gem_private_object_init(dev, obj, size);
 861
 862         npages = size / PAGE_SIZE;
 863
 864         msm_obj = to_msm_bo(obj);
 865         msm_obj->sgt = sgt;
 866         msm_obj->pages = drm_malloc_ab(npages, sizeof(struct page *));
 867         if (!msm_obj->pages) {
 868                 ret = -ENOMEM;
 869                 goto fail;
 870         }
 871
 872         ret = drm_prime_sg_to_page_addr_arrays(sgt, msm_obj->pages, NULL, npages);
 873         if (ret)
 874                 goto fail;
 875
 876         return obj;
 877
 878 fail:
 879         drm_gem_object_unreference_unlocked(obj);
 880         return ERR_PTR(ret);
 881 }