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->pages = p;
  95
  96                 msm_obj->sgt = drm_prime_pages_to_sg(p, npages);
  97                 if (IS_ERR(msm_obj->sgt)) {
  98                         void *ptr = ERR_CAST(msm_obj->sgt);
  99
 100                         dev_err(dev->dev, "failed to allocate sgt\n");
 101                         msm_obj->sgt = NULL;
 102                         return ptr;
 103                 }
 104
 105                 /* For non-cached buffers, ensure the new pages are clean
 106                  * because display controller, GPU, etc. are not coherent:
 107                  */
 108                 if (msm_obj->flags & (MSM_BO_WC|MSM_BO_UNCACHED))
 109                         dma_map_sg(dev->dev, msm_obj->sgt->sgl,
 110                                         msm_obj->sgt->nents, DMA_BIDIRECTIONAL);
 111         }
 112
 113         return msm_obj->pages;
 114 }
 115
 116 static void put_pages(struct drm_gem_object *obj)
 117 {
 118         struct msm_gem_object *msm_obj = to_msm_bo(obj);
 119
 120         if (msm_obj->pages) {
 121                 if (msm_obj->sgt) {
 122                         /* For non-cached buffers, ensure the new
 123                          * pages are clean because display controller,
 124                          * GPU, etc. are not coherent:
 125                          */
 126                         if (msm_obj->flags & (MSM_BO_WC|MSM_BO_UNCACHED))
 127                                 dma_unmap_sg(obj->dev->dev, msm_obj->sgt->sgl,
 128                                              msm_obj->sgt->nents,
 129                                              DMA_BIDIRECTIONAL);
 130
 131                         sg_free_table(msm_obj->sgt);
 132                         kfree(msm_obj->sgt);
 133                 }
 134
 135                 if (use_pages(obj))
 136                         drm_gem_put_pages(obj, msm_obj->pages, true, false);
 137                 else {
 138                         drm_mm_remove_node(msm_obj->vram_node);
 139                         drm_free_large(msm_obj->pages);
 140                 }
 141
 142                 msm_obj->pages = NULL;
 143         }
 144 }
 145
 146 struct page **msm_gem_get_pages(struct drm_gem_object *obj)
 147 {
 148         struct drm_device *dev = obj->dev;
 149         struct page **p;
 150         mutex_lock(&dev->struct_mutex);
 151         p = get_pages(obj);
 152         mutex_unlock(&dev->struct_mutex);
 153         return p;
 154 }
 155
 156 void msm_gem_put_pages(struct drm_gem_object *obj)
 157 {
 158         /* when we start tracking the pin count, then do something here */
 159 }
 160
 161 int msm_gem_mmap_obj(struct drm_gem_object *obj,
 162                 struct vm_area_struct *vma)
 163 {
 164         struct msm_gem_object *msm_obj = to_msm_bo(obj);
 165
 166         vma->vm_flags &= ~VM_PFNMAP;
 167         vma->vm_flags |= VM_MIXEDMAP;
 168
 169         if (msm_obj->flags & MSM_BO_WC) {
 170                 vma->vm_page_prot = pgprot_writecombine(vm_get_page_prot(vma->vm_flags));
 171         } else if (msm_obj->flags & MSM_BO_UNCACHED) {
 172                 vma->vm_page_prot = pgprot_noncached(vm_get_page_prot(vma->vm_flags));
 173         } else {
 174                 /*
 175                  * Shunt off cached objs to shmem file so they have their own
 176                  * address_space (so unmap_mapping_range does what we want,
 177                  * in particular in the case of mmap'd dmabufs)
 178                  */
 179                 fput(vma->vm_file);
 180                 get_file(obj->filp);
 181                 vma->vm_pgoff = 0;
 182                 vma->vm_file  = obj->filp;
 183
 184                 vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
 185         }
 186
 187         return 0;
 188 }
 189
 190 int msm_gem_mmap(struct file *filp, struct vm_area_struct *vma)
 191 {
 192         int ret;
 193
 194         ret = drm_gem_mmap(filp, vma);
 195         if (ret) {
 196                 DBG("mmap failed: %d", ret);
 197                 return ret;
 198         }
 199
 200         return msm_gem_mmap_obj(vma->vm_private_data, vma);
 201 }
 202
 203 int msm_gem_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
 204 {
 205         struct drm_gem_object *obj = vma->vm_private_data;
 206         struct drm_device *dev = obj->dev;
 207         struct msm_drm_private *priv = dev->dev_private;
 208         struct page **pages;
 209         unsigned long pfn;
 210         pgoff_t pgoff;
 211         int ret;
 212
 213         /* This should only happen if userspace tries to pass a mmap'd
 214          * but unfaulted gem bo vaddr into submit ioctl, triggering
 215          * a page fault while struct_mutex is already held.  This is
 216          * not a valid use-case so just bail.
 217          */
 218         if (priv->struct_mutex_task == current)
 219                 return VM_FAULT_SIGBUS;
 220
 221         /* Make sure we don't parallel update on a fault, nor move or remove
 222          * something from beneath our feet
 223          */
 224         ret = mutex_lock_interruptible(&dev->struct_mutex);
 225         if (ret)
 226                 goto out;
 227
 228         /* make sure we have pages attached now */
 229         pages = get_pages(obj);
 230         if (IS_ERR(pages)) {
 231                 ret = PTR_ERR(pages);
 232                 goto out_unlock;
 233         }
 234
 235         /* We don't use vmf->pgoff since that has the fake offset: */
 236         pgoff = ((unsigned long)vmf->virtual_address -
 237                         vma->vm_start) >> PAGE_SHIFT;
 238
 239         pfn = page_to_pfn(pages[pgoff]);
 240
 241         VERB("Inserting %p pfn %lx, pa %lx", vmf->virtual_address,
 242                         pfn, pfn << PAGE_SHIFT);
 243
 244         ret = vm_insert_mixed(vma, (unsigned long)vmf->virtual_address,
 245                         __pfn_to_pfn_t(pfn, PFN_DEV));
 246
 247 out_unlock:
 248         mutex_unlock(&dev->struct_mutex);
 249 out:
 250         switch (ret) {
 251         case -EAGAIN:
 252         case 0:
 253         case -ERESTARTSYS:
 254         case -EINTR:
 255         case -EBUSY:
 256                 /*
 257                  * EBUSY is ok: this just means that another thread
 258                  * already did the job.
 259                  */
 260                 return VM_FAULT_NOPAGE;
 261         case -ENOMEM:
 262                 return VM_FAULT_OOM;
 263         default:
 264                 return VM_FAULT_SIGBUS;
 265         }
 266 }
 267
 268 /** get mmap offset */
 269 static uint64_t mmap_offset(struct drm_gem_object *obj)
 270 {
 271         struct drm_device *dev = obj->dev;
 272         int ret;
 273
 274         WARN_ON(!mutex_is_locked(&dev->struct_mutex));
 275
 276         /* Make it mmapable */
 277         ret = drm_gem_create_mmap_offset(obj);
 278
 279         if (ret) {
 280                 dev_err(dev->dev, "could not allocate mmap offset\n");
 281                 return 0;
 282         }
 283
 284         return drm_vma_node_offset_addr(&obj->vma_node);
 285 }
 286
 287 uint64_t msm_gem_mmap_offset(struct drm_gem_object *obj)
 288 {
 289         uint64_t offset;
 290         mutex_lock(&obj->dev->struct_mutex);
 291         offset = mmap_offset(obj);
 292         mutex_unlock(&obj->dev->struct_mutex);
 293         return offset;
 294 }
 295
 296 static void
 297 put_iova(struct drm_gem_object *obj)
 298 {
 299         struct drm_device *dev = obj->dev;
 300         struct msm_drm_private *priv = obj->dev->dev_private;
 301         struct msm_gem_object *msm_obj = to_msm_bo(obj);
 302         int id;
 303
 304         WARN_ON(!mutex_is_locked(&dev->struct_mutex));
 305
 306         for (id = 0; id < ARRAY_SIZE(msm_obj->domain); id++) {
 307                 struct msm_mmu *mmu = priv->mmus[id];
 308                 if (mmu && msm_obj->domain[id].iova) {
 309                         uint32_t offset = msm_obj->domain[id].iova;
 310                         mmu->funcs->unmap(mmu, offset, msm_obj->sgt, obj->size);
 311                         msm_obj->domain[id].iova = 0;
 312                 }
 313         }
 314 }
 315
 316 /* should be called under struct_mutex.. although it can be called
 317  * from atomic context without struct_mutex to acquire an extra
 318  * iova ref if you know one is already held.
 319  *
 320  * That means when I do eventually need to add support for unpinning
 321  * the refcnt counter needs to be atomic_t.
 322  */
 323 int msm_gem_get_iova_locked(struct drm_gem_object *obj, int id,
 324                 uint32_t *iova)
 325 {
 326         struct msm_gem_object *msm_obj = to_msm_bo(obj);
 327         int ret = 0;
 328
 329         if (!msm_obj->domain[id].iova) {
 330                 struct msm_drm_private *priv = obj->dev->dev_private;
 331                 struct page **pages = get_pages(obj);
 332
 333                 if (IS_ERR(pages))
 334                         return PTR_ERR(pages);
 335
 336                 if (iommu_present(&platform_bus_type)) {
 337                         struct msm_mmu *mmu = priv->mmus[id];
 338                         uint32_t offset;
 339
 340                         if (WARN_ON(!mmu))
 341                                 return -EINVAL;
 342
 343                         offset = (uint32_t)mmap_offset(obj);
 344                         ret = mmu->funcs->map(mmu, offset, msm_obj->sgt,
 345                                         obj->size, IOMMU_READ | IOMMU_WRITE);
 346                         msm_obj->domain[id].iova = offset;
 347                 } else {
 348                         msm_obj->domain[id].iova = physaddr(obj);
 349                 }
 350         }
 351
 352         if (!ret)
 353                 *iova = msm_obj->domain[id].iova;
 354
 355         return ret;
 356 }
 357
 358 /* get iova, taking a reference.  Should have a matching put */
 359 int msm_gem_get_iova(struct drm_gem_object *obj, int id, uint32_t *iova)
 360 {
 361         struct msm_gem_object *msm_obj = to_msm_bo(obj);
 362         int ret;
 363
 364         /* this is safe right now because we don't unmap until the
 365          * bo is deleted:
 366          */
 367         if (msm_obj->domain[id].iova) {
 368                 *iova = msm_obj->domain[id].iova;
 369                 return 0;
 370         }
 371
 372         mutex_lock(&obj->dev->struct_mutex);
 373         ret = msm_gem_get_iova_locked(obj, id, iova);
 374         mutex_unlock(&obj->dev->struct_mutex);
 375         return ret;
 376 }
 377
 378 /* get iova without taking a reference, used in places where you have
 379  * already done a 'msm_gem_get_iova()'.
 380  */
 381 uint32_t msm_gem_iova(struct drm_gem_object *obj, int id)
 382 {
 383         struct msm_gem_object *msm_obj = to_msm_bo(obj);
 384         WARN_ON(!msm_obj->domain[id].iova);
 385         return msm_obj->domain[id].iova;
 386 }
 387
 388 void msm_gem_put_iova(struct drm_gem_object *obj, int id)
 389 {
 390         // XXX TODO ..
 391         // NOTE: probably don't need a _locked() version.. we wouldn't
 392         // normally unmap here, but instead just mark that it could be
 393         // unmapped (if the iova refcnt drops to zero), but then later
 394         // if another _get_iova_locked() fails we can start unmapping
 395         // things that are no longer needed..
 396 }
 397
 398 int msm_gem_dumb_create(struct drm_file *file, struct drm_device *dev,
 399                 struct drm_mode_create_dumb *args)
 400 {
 401         args->pitch = align_pitch(args->width, args->bpp);
 402         args->size  = PAGE_ALIGN(args->pitch * args->height);
 403         return msm_gem_new_handle(dev, file, args->size,
 404                         MSM_BO_SCANOUT | MSM_BO_WC, &args->handle);
 405 }
 406
 407 int msm_gem_dumb_map_offset(struct drm_file *file, struct drm_device *dev,
 408                 uint32_t handle, uint64_t *offset)
 409 {
 410         struct drm_gem_object *obj;
 411         int ret = 0;
 412
 413         /* GEM does all our handle to object mapping */
 414         obj = drm_gem_object_lookup(file, handle);
 415         if (obj == NULL) {
 416                 ret = -ENOENT;
 417                 goto fail;
 418         }
 419
 420         *offset = msm_gem_mmap_offset(obj);
 421
 422         drm_gem_object_unreference_unlocked(obj);
 423
 424 fail:
 425         return ret;
 426 }
 427
 428 void *msm_gem_get_vaddr_locked(struct drm_gem_object *obj)
 429 {
 430         struct msm_gem_object *msm_obj = to_msm_bo(obj);
 431         WARN_ON(!mutex_is_locked(&obj->dev->struct_mutex));
 432         if (!msm_obj->vaddr) {
 433                 struct page **pages = get_pages(obj);
 434                 if (IS_ERR(pages))
 435                         return ERR_CAST(pages);
 436                 msm_obj->vaddr = vmap(pages, obj->size >> PAGE_SHIFT,
 437                                 VM_MAP, pgprot_writecombine(PAGE_KERNEL));
 438                 if (msm_obj->vaddr == NULL)
 439                         return ERR_PTR(-ENOMEM);
 440         }
 441         msm_obj->vmap_count++;
 442         return msm_obj->vaddr;
 443 }
 444
 445 void *msm_gem_get_vaddr(struct drm_gem_object *obj)
 446 {
 447         void *ret;
 448         mutex_lock(&obj->dev->struct_mutex);
 449         ret = msm_gem_get_vaddr_locked(obj);
 450         mutex_unlock(&obj->dev->struct_mutex);
 451         return ret;
 452 }
 453
 454 void msm_gem_put_vaddr_locked(struct drm_gem_object *obj)
 455 {
 456         struct msm_gem_object *msm_obj = to_msm_bo(obj);
 457         WARN_ON(!mutex_is_locked(&obj->dev->struct_mutex));
 458         WARN_ON(msm_obj->vmap_count < 1);
 459         msm_obj->vmap_count--;
 460 }
 461
 462 void msm_gem_put_vaddr(struct drm_gem_object *obj)
 463 {
 464         mutex_lock(&obj->dev->struct_mutex);
 465         msm_gem_put_vaddr_locked(obj);
 466         mutex_unlock(&obj->dev->struct_mutex);
 467 }
 468
 469 /* Update madvise status, returns true if not purged, else
 470  * false or -errno.
 471  */
 472 int msm_gem_madvise(struct drm_gem_object *obj, unsigned madv)
 473 {
 474         struct msm_gem_object *msm_obj = to_msm_bo(obj);
 475
 476         WARN_ON(!mutex_is_locked(&obj->dev->struct_mutex));
 477
 478         if (msm_obj->madv != __MSM_MADV_PURGED)
 479                 msm_obj->madv = madv;
 480
 481         return (msm_obj->madv != __MSM_MADV_PURGED);
 482 }
 483
 484 void msm_gem_purge(struct drm_gem_object *obj)
 485 {
 486         struct drm_device *dev = obj->dev;
 487         struct msm_gem_object *msm_obj = to_msm_bo(obj);
 488
 489         WARN_ON(!mutex_is_locked(&dev->struct_mutex));
 490         WARN_ON(!is_purgeable(msm_obj));
 491         WARN_ON(obj->import_attach);
 492
 493         put_iova(obj);
 494
 495         msm_gem_vunmap(obj);
 496
 497         put_pages(obj);
 498
 499         msm_obj->madv = __MSM_MADV_PURGED;
 500
 501         drm_vma_node_unmap(&obj->vma_node, dev->anon_inode->i_mapping);
 502         drm_gem_free_mmap_offset(obj);
 503
 504         /* Our goal here is to return as much of the memory as
 505          * is possible back to the system as we are called from OOM.
 506          * To do this we must instruct the shmfs to drop all of its
 507          * backing pages, *now*.
 508          */
 509         shmem_truncate_range(file_inode(obj->filp), 0, (loff_t)-1);
 510
 511         invalidate_mapping_pages(file_inode(obj->filp)->i_mapping,
 512                         0, (loff_t)-1);
 513 }
 514
 515 void msm_gem_vunmap(struct drm_gem_object *obj)
 516 {
 517         struct msm_gem_object *msm_obj = to_msm_bo(obj);
 518
 519         if (!msm_obj->vaddr || WARN_ON(!is_vunmapable(msm_obj)))
 520                 return;
 521
 522         vunmap(msm_obj->vaddr);
 523         msm_obj->vaddr = NULL;
 524 }
 525
 526 /* must be called before _move_to_active().. */
 527 int msm_gem_sync_object(struct drm_gem_object *obj,
 528                 struct msm_fence_context *fctx, bool exclusive)
 529 {
 530         struct msm_gem_object *msm_obj = to_msm_bo(obj);
 531         struct reservation_object_list *fobj;
 532         struct fence *fence;
 533         int i, ret;
 534
 535         if (!exclusive) {
 536                 /* NOTE: _reserve_shared() must happen before _add_shared_fence(),
 537                  * which makes this a slightly strange place to call it.  OTOH this
 538                  * is a convenient can-fail point to hook it in.  (And similar to
 539                  * how etnaviv and nouveau handle this.)
 540                  */
 541                 ret = reservation_object_reserve_shared(msm_obj->resv);
 542                 if (ret)
 543                         return ret;
 544         }
 545
 546         fobj = reservation_object_get_list(msm_obj->resv);
 547         if (!fobj || (fobj->shared_count == 0)) {
 548                 fence = reservation_object_get_excl(msm_obj->resv);
 549                 /* don't need to wait on our own fences, since ring is fifo */
 550                 if (fence && (fence->context != fctx->context)) {
 551                         ret = fence_wait(fence, true);
 552                         if (ret)
 553                                 return ret;
 554                 }
 555         }
 556
 557         if (!exclusive || !fobj)
 558                 return 0;
 559
 560         for (i = 0; i < fobj->shared_count; i++) {
 561                 fence = rcu_dereference_protected(fobj->shared[i],
 562                                                 reservation_object_held(msm_obj->resv));
 563                 if (fence->context != fctx->context) {
 564                         ret = fence_wait(fence, true);
 565                         if (ret)
 566                                 return ret;
 567                 }
 568         }
 569
 570         return 0;
 571 }
 572
 573 void msm_gem_move_to_active(struct drm_gem_object *obj,
 574                 struct msm_gpu *gpu, bool exclusive, struct fence *fence)
 575 {
 576         struct msm_gem_object *msm_obj = to_msm_bo(obj);
 577         WARN_ON(msm_obj->madv != MSM_MADV_WILLNEED);
 578         msm_obj->gpu = gpu;
 579         if (exclusive)
 580                 reservation_object_add_excl_fence(msm_obj->resv, fence);
 581         else
 582                 reservation_object_add_shared_fence(msm_obj->resv, fence);
 583         list_del_init(&msm_obj->mm_list);
 584         list_add_tail(&msm_obj->mm_list, &gpu->active_list);
 585 }
 586
 587 void msm_gem_move_to_inactive(struct drm_gem_object *obj)
 588 {
 589         struct drm_device *dev = obj->dev;
 590         struct msm_drm_private *priv = dev->dev_private;
 591         struct msm_gem_object *msm_obj = to_msm_bo(obj);
 592
 593         WARN_ON(!mutex_is_locked(&dev->struct_mutex));
 594
 595         msm_obj->gpu = NULL;
 596         list_del_init(&msm_obj->mm_list);
 597         list_add_tail(&msm_obj->mm_list, &priv->inactive_list);
 598 }
 599
 600 int msm_gem_cpu_prep(struct drm_gem_object *obj, uint32_t op, ktime_t *timeout)
 601 {
 602         struct msm_gem_object *msm_obj = to_msm_bo(obj);
 603         bool write = !!(op & MSM_PREP_WRITE);
 604         unsigned long remain =
 605                 op & MSM_PREP_NOSYNC ? 0 : timeout_to_jiffies(timeout);
 606         long ret;
 607
 608         ret = reservation_object_wait_timeout_rcu(msm_obj->resv, write,
 609                                                   true,  remain);
 610         if (ret == 0)
 611                 return remain == 0 ? -EBUSY : -ETIMEDOUT;
 612         else if (ret < 0)
 613                 return ret;
 614
 615         /* TODO cache maintenance */
 616
 617         return 0;
 618 }
 619
 620 int msm_gem_cpu_fini(struct drm_gem_object *obj)
 621 {
 622         /* TODO cache maintenance */
 623         return 0;
 624 }
 625
 626 #ifdef CONFIG_DEBUG_FS
 627 static void describe_fence(struct fence *fence, const char *type,
 628                 struct seq_file *m)
 629 {
 630         if (!fence_is_signaled(fence))
 631                 seq_printf(m, "\t%9s: %s %s seq %u\n", type,
 632                                 fence->ops->get_driver_name(fence),
 633                                 fence->ops->get_timeline_name(fence),
 634                                 fence->seqno);
 635 }
 636
 637 void msm_gem_describe(struct drm_gem_object *obj, struct seq_file *m)
 638 {
 639         struct msm_gem_object *msm_obj = to_msm_bo(obj);
 640         struct reservation_object *robj = msm_obj->resv;
 641         struct reservation_object_list *fobj;
 642         struct fence *fence;
 643         uint64_t off = drm_vma_node_start(&obj->vma_node);
 644         const char *madv;
 645
 646         WARN_ON(!mutex_is_locked(&obj->dev->struct_mutex));
 647
 648         switch (msm_obj->madv) {
 649         case __MSM_MADV_PURGED:
 650                 madv = " purged";
 651                 break;
 652         case MSM_MADV_DONTNEED:
 653                 madv = " purgeable";
 654                 break;
 655         case MSM_MADV_WILLNEED:
 656         default:
 657                 madv = "";
 658                 break;
 659         }
 660
 661         seq_printf(m, "%08x: %c %2d (%2d) %08llx %p %zu%s\n",
 662                         msm_obj->flags, is_active(msm_obj) ? 'A' : 'I',
 663                         obj->name, obj->refcount.refcount.counter,
 664                         off, msm_obj->vaddr, obj->size, madv);
 665
 666         rcu_read_lock();
 667         fobj = rcu_dereference(robj->fence);
 668         if (fobj) {
 669                 unsigned int i, shared_count = fobj->shared_count;
 670
 671                 for (i = 0; i < shared_count; i++) {
 672                         fence = rcu_dereference(fobj->shared[i]);
 673                         describe_fence(fence, "Shared", m);
 674                 }
 675         }
 676
 677         fence = rcu_dereference(robj->fence_excl);
 678         if (fence)
 679                 describe_fence(fence, "Exclusive", m);
 680         rcu_read_unlock();
 681 }
 682
 683 void msm_gem_describe_objects(struct list_head *list, struct seq_file *m)
 684 {
 685         struct msm_gem_object *msm_obj;
 686         int count = 0;
 687         size_t size = 0;
 688
 689         list_for_each_entry(msm_obj, list, mm_list) {
 690                 struct drm_gem_object *obj = &msm_obj->base;
 691                 seq_printf(m, "   ");
 692                 msm_gem_describe(obj, m);
 693                 count++;
 694                 size += obj->size;
 695         }
 696
 697         seq_printf(m, "Total %d objects, %zu bytes\n", count, size);
 698 }
 699 #endif
 700
 701 void msm_gem_free_object(struct drm_gem_object *obj)
 702 {
 703         struct drm_device *dev = obj->dev;
 704         struct msm_gem_object *msm_obj = to_msm_bo(obj);
 705
 706         WARN_ON(!mutex_is_locked(&dev->struct_mutex));
 707
 708         /* object should not be on active list: */
 709         WARN_ON(is_active(msm_obj));
 710
 711         list_del(&msm_obj->mm_list);
 712
 713         put_iova(obj);
 714
 715         if (obj->import_attach) {
 716                 if (msm_obj->vaddr)
 717                         dma_buf_vunmap(obj->import_attach->dmabuf, msm_obj->vaddr);
 718
 719                 /* Don't drop the pages for imported dmabuf, as they are not
 720                  * ours, just free the array we allocated:
 721                  */
 722                 if (msm_obj->pages)
 723                         drm_free_large(msm_obj->pages);
 724
 725                 drm_prime_gem_destroy(obj, msm_obj->sgt);
 726         } else {
 727                 msm_gem_vunmap(obj);
 728                 put_pages(obj);
 729         }
 730
 731         if (msm_obj->resv == &msm_obj->_resv)
 732                 reservation_object_fini(msm_obj->resv);
 733
 734         drm_gem_object_release(obj);
 735
 736         kfree(msm_obj);
 737 }
 738
 739 /* convenience method to construct a GEM buffer object, and userspace handle */
 740 int msm_gem_new_handle(struct drm_device *dev, struct drm_file *file,
 741                 uint32_t size, uint32_t flags, uint32_t *handle)
 742 {
 743         struct drm_gem_object *obj;
 744         int ret;
 745
 746         ret = mutex_lock_interruptible(&dev->struct_mutex);
 747         if (ret)
 748                 return ret;
 749
 750         obj = msm_gem_new(dev, size, flags);
 751
 752         mutex_unlock(&dev->struct_mutex);
 753
 754         if (IS_ERR(obj))
 755                 return PTR_ERR(obj);
 756
 757         ret = drm_gem_handle_create(file, obj, handle);
 758
 759         /* drop reference from allocate - handle holds it now */
 760         drm_gem_object_unreference_unlocked(obj);
 761
 762         return ret;
 763 }
 764
 765 static int msm_gem_new_impl(struct drm_device *dev,
 766                 uint32_t size, uint32_t flags,
 767                 struct reservation_object *resv,
 768                 struct drm_gem_object **obj)
 769 {
 770         struct msm_drm_private *priv = dev->dev_private;
 771         struct msm_gem_object *msm_obj;
 772         unsigned sz;
 773         bool use_vram = false;
 774
 775         WARN_ON(!mutex_is_locked(&dev->struct_mutex));
 776
 777         switch (flags & MSM_BO_CACHE_MASK) {
 778         case MSM_BO_UNCACHED:
 779         case MSM_BO_CACHED:
 780         case MSM_BO_WC:
 781                 break;
 782         default:
 783                 dev_err(dev->dev, "invalid cache flag: %x\n",
 784                                 (flags & MSM_BO_CACHE_MASK));
 785                 return -EINVAL;
 786         }
 787
 788         if (!iommu_present(&platform_bus_type))
 789                 use_vram = true;
 790         else if ((flags & MSM_BO_STOLEN) && priv->vram.size)
 791                 use_vram = true;
 792
 793         if (WARN_ON(use_vram && !priv->vram.size))
 794                 return -EINVAL;
 795
 796         sz = sizeof(*msm_obj);
 797         if (use_vram)
 798                 sz += sizeof(struct drm_mm_node);
 799
 800         msm_obj = kzalloc(sz, GFP_KERNEL);
 801         if (!msm_obj)
 802                 return -ENOMEM;
 803
 804         if (use_vram)
 805                 msm_obj->vram_node = (void *)&msm_obj[1];
 806
 807         msm_obj->flags = flags;
 808         msm_obj->madv = MSM_MADV_WILLNEED;
 809
 810         if (resv) {
 811                 msm_obj->resv = resv;
 812         } else {
 813                 msm_obj->resv = &msm_obj->_resv;
 814                 reservation_object_init(msm_obj->resv);
 815         }
 816
 817         INIT_LIST_HEAD(&msm_obj->submit_entry);
 818         list_add_tail(&msm_obj->mm_list, &priv->inactive_list);
 819
 820         *obj = &msm_obj->base;
 821
 822         return 0;
 823 }
 824
 825 struct drm_gem_object *msm_gem_new(struct drm_device *dev,
 826                 uint32_t size, uint32_t flags)
 827 {
 828         struct drm_gem_object *obj = NULL;
 829         int ret;
 830
 831         WARN_ON(!mutex_is_locked(&dev->struct_mutex));
 832
 833         size = PAGE_ALIGN(size);
 834
 835         ret = msm_gem_new_impl(dev, size, flags, NULL, &obj);
 836         if (ret)
 837                 goto fail;
 838
 839         if (use_pages(obj)) {
 840                 ret = drm_gem_object_init(dev, obj, size);
 841                 if (ret)
 842                         goto fail;
 843         } else {
 844                 drm_gem_private_object_init(dev, obj, size);
 845         }
 846
 847         return obj;
 848
 849 fail:
 850         drm_gem_object_unreference(obj);
 851         return ERR_PTR(ret);
 852 }
 853
 854 struct drm_gem_object *msm_gem_import(struct drm_device *dev,
 855                 struct dma_buf *dmabuf, struct sg_table *sgt)
 856 {
 857         struct msm_gem_object *msm_obj;
 858         struct drm_gem_object *obj;
 859         uint32_t size;
 860         int ret, npages;
 861
 862         /* if we don't have IOMMU, don't bother pretending we can import: */
 863         if (!iommu_present(&platform_bus_type)) {
 864                 dev_err(dev->dev, "cannot import without IOMMU\n");
 865                 return ERR_PTR(-EINVAL);
 866         }
 867
 868         size = PAGE_ALIGN(dmabuf->size);
 869
 870         /* Take mutex so we can modify the inactive list in msm_gem_new_impl */
 871         mutex_lock(&dev->struct_mutex);
 872         ret = msm_gem_new_impl(dev, size, MSM_BO_WC, dmabuf->resv, &obj);
 873         mutex_unlock(&dev->struct_mutex);
 874
 875         if (ret)
 876                 goto fail;
 877
 878         drm_gem_private_object_init(dev, obj, size);
 879
 880         npages = size / PAGE_SIZE;
 881
 882         msm_obj = to_msm_bo(obj);
 883         msm_obj->sgt = sgt;
 884         msm_obj->pages = drm_malloc_ab(npages, sizeof(struct page *));
 885         if (!msm_obj->pages) {
 886                 ret = -ENOMEM;
 887                 goto fail;
 888         }
 889
 890         ret = drm_prime_sg_to_page_addr_arrays(sgt, msm_obj->pages, NULL, npages);
 891         if (ret)
 892                 goto fail;
 893
 894         return obj;
 895
 896 fail:
 897         drm_gem_object_unreference_unlocked(obj);
 898         return ERR_PTR(ret);
 899 }