drivers/gpu/drm/ttm/ttm_bo_util.c

   1 /**************************************************************************
   2  *
   3  * Copyright (c) 2007-2009 VMware, Inc., Palo Alto, CA., USA
   4  * All Rights Reserved.
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * copy of this software and associated documentation files (the
   8  * "Software"), to deal in the Software without restriction, including
   9  * without limitation the rights to use, copy, modify, merge, publish,
  10  * distribute, sub license, and/or sell copies of the Software, and to
  11  * permit persons to whom the Software is furnished to do so, subject to
  12  * the following conditions:
  13  *
  14  * The above copyright notice and this permission notice (including the
  15  * next paragraph) shall be included in all copies or substantial portions
  16  * of the Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  19  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  20  * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
  21  * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
  22  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
  23  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
  24  * USE OR OTHER DEALINGS IN THE SOFTWARE.
  25  *
  26  **************************************************************************/
  27 /*
  28  * Authors: Thomas Hellstrom <thellstrom-at-vmware-dot-com>
  29  */
  30
  31 #include <drm/ttm/ttm_bo_driver.h>
  32 #include <drm/ttm/ttm_placement.h>
  33 #include <drm/drm_vma_manager.h>
  34 #include <linux/io.h>
  35 #include <linux/highmem.h>
  36 #include <linux/wait.h>
  37 #include <linux/slab.h>
  38 #include <linux/vmalloc.h>
  39 #include <linux/module.h>
  40
  41 void ttm_bo_free_old_node(struct ttm_buffer_object *bo)
  42 {
  43         ttm_bo_mem_put(bo, &bo->mem);
  44 }
  45
  46 int ttm_bo_move_ttm(struct ttm_buffer_object *bo,
  47                     bool evict,
  48                     bool no_wait_gpu, struct ttm_mem_reg *new_mem)
  49 {
  50         struct ttm_tt *ttm = bo->ttm;
  51         struct ttm_mem_reg *old_mem = &bo->mem;
  52         int ret;
  53
  54         if (old_mem->mem_type != TTM_PL_SYSTEM) {
  55                 ttm_tt_unbind(ttm);
  56                 ttm_bo_free_old_node(bo);
  57                 ttm_flag_masked(&old_mem->placement, TTM_PL_FLAG_SYSTEM,
  58                                 TTM_PL_MASK_MEM);
  59                 old_mem->mem_type = TTM_PL_SYSTEM;
  60         }
  61
  62         ret = ttm_tt_set_placement_caching(ttm, new_mem->placement);
  63         if (unlikely(ret != 0))
  64                 return ret;
  65
  66         if (new_mem->mem_type != TTM_PL_SYSTEM) {
  67                 ret = ttm_tt_bind(ttm, new_mem);
  68                 if (unlikely(ret != 0))
  69                         return ret;
  70         }
  71
  72         *old_mem = *new_mem;
  73         new_mem->mm_node = NULL;
  74
  75         return 0;
  76 }
  77 EXPORT_SYMBOL(ttm_bo_move_ttm);
  78
  79 int ttm_mem_io_lock(struct ttm_mem_type_manager *man, bool interruptible)
  80 {
  81         if (likely(man->io_reserve_fastpath))
  82                 return 0;
  83
  84         if (interruptible)
  85                 return mutex_lock_interruptible(&man->io_reserve_mutex);
  86
  87         mutex_lock(&man->io_reserve_mutex);
  88         return 0;
  89 }
  90 EXPORT_SYMBOL(ttm_mem_io_lock);
  91
  92 void ttm_mem_io_unlock(struct ttm_mem_type_manager *man)
  93 {
  94         if (likely(man->io_reserve_fastpath))
  95                 return;
  96
  97         mutex_unlock(&man->io_reserve_mutex);
  98 }
  99 EXPORT_SYMBOL(ttm_mem_io_unlock);
 100
 101 static int ttm_mem_io_evict(struct ttm_mem_type_manager *man)
 102 {
 103         struct ttm_buffer_object *bo;
 104
 105         if (!man->use_io_reserve_lru || list_empty(&man->io_reserve_lru))
 106                 return -EAGAIN;
 107
 108         bo = list_first_entry(&man->io_reserve_lru,
 109                               struct ttm_buffer_object,
 110                               io_reserve_lru);
 111         list_del_init(&bo->io_reserve_lru);
 112         ttm_bo_unmap_virtual_locked(bo);
 113
 114         return 0;
 115 }
 116
 117
 118 int ttm_mem_io_reserve(struct ttm_bo_device *bdev,
 119                        struct ttm_mem_reg *mem)
 120 {
 121         struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
 122         int ret = 0;
 123
 124         if (!bdev->driver->io_mem_reserve)
 125                 return 0;
 126         if (likely(man->io_reserve_fastpath))
 127                 return bdev->driver->io_mem_reserve(bdev, mem);
 128
 129         if (bdev->driver->io_mem_reserve &&
 130             mem->bus.io_reserved_count++ == 0) {
 131 retry:
 132                 ret = bdev->driver->io_mem_reserve(bdev, mem);
 133                 if (ret == -EAGAIN) {
 134                         ret = ttm_mem_io_evict(man);
 135                         if (ret == 0)
 136                                 goto retry;
 137                 }
 138         }
 139         return ret;
 140 }
 141 EXPORT_SYMBOL(ttm_mem_io_reserve);
 142
 143 void ttm_mem_io_free(struct ttm_bo_device *bdev,
 144                      struct ttm_mem_reg *mem)
 145 {
 146         struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
 147
 148         if (likely(man->io_reserve_fastpath))
 149                 return;
 150
 151         if (bdev->driver->io_mem_reserve &&
 152             --mem->bus.io_reserved_count == 0 &&
 153             bdev->driver->io_mem_free)
 154                 bdev->driver->io_mem_free(bdev, mem);
 155
 156 }
 157 EXPORT_SYMBOL(ttm_mem_io_free);
 158
 159 int ttm_mem_io_reserve_vm(struct ttm_buffer_object *bo)
 160 {
 161         struct ttm_mem_reg *mem = &bo->mem;
 162         int ret;
 163
 164         if (!mem->bus.io_reserved_vm) {
 165                 struct ttm_mem_type_manager *man =
 166                         &bo->bdev->man[mem->mem_type];
 167
 168                 ret = ttm_mem_io_reserve(bo->bdev, mem);
 169                 if (unlikely(ret != 0))
 170                         return ret;
 171                 mem->bus.io_reserved_vm = true;
 172                 if (man->use_io_reserve_lru)
 173                         list_add_tail(&bo->io_reserve_lru,
 174                                       &man->io_reserve_lru);
 175         }
 176         return 0;
 177 }
 178
 179 void ttm_mem_io_free_vm(struct ttm_buffer_object *bo)
 180 {
 181         struct ttm_mem_reg *mem = &bo->mem;
 182
 183         if (mem->bus.io_reserved_vm) {
 184                 mem->bus.io_reserved_vm = false;
 185                 list_del_init(&bo->io_reserve_lru);
 186                 ttm_mem_io_free(bo->bdev, mem);
 187         }
 188 }
 189
 190 static int ttm_mem_reg_ioremap(struct ttm_bo_device *bdev, struct ttm_mem_reg *mem,
 191                         void **virtual)
 192 {
 193         struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
 194         int ret;
 195         void *addr;
 196
 197         *virtual = NULL;
 198         (void) ttm_mem_io_lock(man, false);
 199         ret = ttm_mem_io_reserve(bdev, mem);
 200         ttm_mem_io_unlock(man);
 201         if (ret || !mem->bus.is_iomem)
 202                 return ret;
 203
 204         if (mem->bus.addr) {
 205                 addr = mem->bus.addr;
 206         } else {
 207                 if (mem->placement & TTM_PL_FLAG_WC)
 208                         addr = ioremap_wc(mem->bus.base + mem->bus.offset, mem->bus.size);
 209                 else
 210                         addr = ioremap_nocache(mem->bus.base + mem->bus.offset, mem->bus.size);
 211                 if (!addr) {
 212                         (void) ttm_mem_io_lock(man, false);
 213                         ttm_mem_io_free(bdev, mem);
 214                         ttm_mem_io_unlock(man);
 215                         return -ENOMEM;
 216                 }
 217         }
 218         *virtual = addr;
 219         return 0;
 220 }
 221
 222 static void ttm_mem_reg_iounmap(struct ttm_bo_device *bdev, struct ttm_mem_reg *mem,
 223                          void *virtual)
 224 {
 225         struct ttm_mem_type_manager *man;
 226
 227         man = &bdev->man[mem->mem_type];
 228
 229         if (virtual && mem->bus.addr == NULL)
 230                 iounmap(virtual);
 231         (void) ttm_mem_io_lock(man, false);
 232         ttm_mem_io_free(bdev, mem);
 233         ttm_mem_io_unlock(man);
 234 }
 235
 236 static int ttm_copy_io_page(void *dst, void *src, unsigned long page)
 237 {
 238         uint32_t *dstP =
 239             (uint32_t *) ((unsigned long)dst + (page << PAGE_SHIFT));
 240         uint32_t *srcP =
 241             (uint32_t *) ((unsigned long)src + (page << PAGE_SHIFT));
 242
 243         int i;
 244         for (i = 0; i < PAGE_SIZE / sizeof(uint32_t); ++i)
 245                 iowrite32(ioread32(srcP++), dstP++);
 246         return 0;
 247 }
 248
 249 static int ttm_copy_io_ttm_page(struct ttm_tt *ttm, void *src,
 250                                 unsigned long page,
 251                                 pgprot_t prot)
 252 {
 253         struct page *d = ttm->pages[page];
 254         void *dst;
 255
 256         if (!d)
 257                 return -ENOMEM;
 258
 259         src = (void *)((unsigned long)src + (page << PAGE_SHIFT));
 260
 261 #ifdef CONFIG_X86
 262         dst = kmap_atomic_prot(d, prot);
 263 #else
 264         if (pgprot_val(prot) != pgprot_val(PAGE_KERNEL))
 265                 dst = vmap(&d, 1, 0, prot);
 266         else
 267                 dst = kmap(d);
 268 #endif
 269         if (!dst)
 270                 return -ENOMEM;
 271
 272         memcpy_fromio(dst, src, PAGE_SIZE);
 273
 274 #ifdef CONFIG_X86
 275         kunmap_atomic(dst);
 276 #else
 277         if (pgprot_val(prot) != pgprot_val(PAGE_KERNEL))
 278                 vunmap(dst);
 279         else
 280                 kunmap(d);
 281 #endif
 282
 283         return 0;
 284 }
 285
 286 static int ttm_copy_ttm_io_page(struct ttm_tt *ttm, void *dst,
 287                                 unsigned long page,
 288                                 pgprot_t prot)
 289 {
 290         struct page *s = ttm->pages[page];
 291         void *src;
 292
 293         if (!s)
 294                 return -ENOMEM;
 295
 296         dst = (void *)((unsigned long)dst + (page << PAGE_SHIFT));
 297 #ifdef CONFIG_X86
 298         src = kmap_atomic_prot(s, prot);
 299 #else
 300         if (pgprot_val(prot) != pgprot_val(PAGE_KERNEL))
 301                 src = vmap(&s, 1, 0, prot);
 302         else
 303                 src = kmap(s);
 304 #endif
 305         if (!src)
 306                 return -ENOMEM;
 307
 308         memcpy_toio(dst, src, PAGE_SIZE);
 309
 310 #ifdef CONFIG_X86
 311         kunmap_atomic(src);
 312 #else
 313         if (pgprot_val(prot) != pgprot_val(PAGE_KERNEL))
 314                 vunmap(src);
 315         else
 316                 kunmap(s);
 317 #endif
 318
 319         return 0;
 320 }
 321
 322 int ttm_bo_move_memcpy(struct ttm_buffer_object *bo,
 323                        bool evict, bool no_wait_gpu,
 324                        struct ttm_mem_reg *new_mem)
 325 {
 326         struct ttm_bo_device *bdev = bo->bdev;
 327         struct ttm_mem_type_manager *man = &bdev->man[new_mem->mem_type];
 328         struct ttm_tt *ttm = bo->ttm;
 329         struct ttm_mem_reg *old_mem = &bo->mem;
 330         struct ttm_mem_reg old_copy = *old_mem;
 331         void *old_iomap;
 332         void *new_iomap;
 333         int ret;
 334         unsigned long i;
 335         unsigned long page;
 336         unsigned long add = 0;
 337         int dir;
 338
 339         ret = ttm_mem_reg_ioremap(bdev, old_mem, &old_iomap);
 340         if (ret)
 341                 return ret;
 342         ret = ttm_mem_reg_ioremap(bdev, new_mem, &new_iomap);
 343         if (ret)
 344                 goto out;
 345
 346         /*
 347          * Single TTM move. NOP.
 348          */
 349         if (old_iomap == NULL && new_iomap == NULL)
 350                 goto out2;
 351
 352         /*
 353          * Don't move nonexistent data. Clear destination instead.
 354          */
 355         if (old_iomap == NULL &&
 356             (ttm == NULL || (ttm->state == tt_unpopulated &&
 357                              !(ttm->page_flags & TTM_PAGE_FLAG_SWAPPED)))) {
 358                 memset_io(new_iomap, 0, new_mem->num_pages*PAGE_SIZE);
 359                 goto out2;
 360         }
 361
 362         /*
 363          * TTM might be null for moves within the same region.
 364          */
 365         if (ttm && ttm->state == tt_unpopulated) {
 366                 ret = ttm->bdev->driver->ttm_tt_populate(ttm);
 367                 if (ret)
 368                         goto out1;
 369         }
 370
 371         add = 0;
 372         dir = 1;
 373
 374         if ((old_mem->mem_type == new_mem->mem_type) &&
 375             (new_mem->start < old_mem->start + old_mem->size)) {
 376                 dir = -1;
 377                 add = new_mem->num_pages - 1;
 378         }
 379
 380         for (i = 0; i < new_mem->num_pages; ++i) {
 381                 page = i * dir + add;
 382                 if (old_iomap == NULL) {
 383                         pgprot_t prot = ttm_io_prot(old_mem->placement,
 384                                                     PAGE_KERNEL);
 385                         ret = ttm_copy_ttm_io_page(ttm, new_iomap, page,
 386                                                    prot);
 387                 } else if (new_iomap == NULL) {
 388                         pgprot_t prot = ttm_io_prot(new_mem->placement,
 389                                                     PAGE_KERNEL);
 390                         ret = ttm_copy_io_ttm_page(ttm, old_iomap, page,
 391                                                    prot);
 392                 } else
 393                         ret = ttm_copy_io_page(new_iomap, old_iomap, page);
 394                 if (ret)
 395                         goto out1;
 396         }
 397         mb();
 398 out2:
 399         old_copy = *old_mem;
 400         *old_mem = *new_mem;
 401         new_mem->mm_node = NULL;
 402
 403         if ((man->flags & TTM_MEMTYPE_FLAG_FIXED) && (ttm != NULL)) {
 404                 ttm_tt_unbind(ttm);
 405                 ttm_tt_destroy(ttm);
 406                 bo->ttm = NULL;
 407         }
 408
 409 out1:
 410         ttm_mem_reg_iounmap(bdev, old_mem, new_iomap);
 411 out:
 412         ttm_mem_reg_iounmap(bdev, &old_copy, old_iomap);
 413
 414         /*
 415          * On error, keep the mm node!
 416          */
 417         if (!ret)
 418                 ttm_bo_mem_put(bo, &old_copy);
 419         return ret;
 420 }
 421 EXPORT_SYMBOL(ttm_bo_move_memcpy);
 422
 423 static void ttm_transfered_destroy(struct ttm_buffer_object *bo)
 424 {
 425         kfree(bo);
 426 }
 427
 428 /**
 429  * ttm_buffer_object_transfer
 430  *
 431  * @bo: A pointer to a struct ttm_buffer_object.
 432  * @new_obj: A pointer to a pointer to a newly created ttm_buffer_object,
 433  * holding the data of @bo with the old placement.
 434  *
 435  * This is a utility function that may be called after an accelerated move
 436  * has been scheduled. A new buffer object is created as a placeholder for
 437  * the old data while it's being copied. When that buffer object is idle,
 438  * it can be destroyed, releasing the space of the old placement.
 439  * Returns:
 440  * !0: Failure.
 441  */
 442
 443 static int ttm_buffer_object_transfer(struct ttm_buffer_object *bo,
 444                                       struct ttm_buffer_object **new_obj)
 445 {
 446         struct ttm_buffer_object *fbo;
 447         struct ttm_bo_device *bdev = bo->bdev;
 448         struct ttm_bo_driver *driver = bdev->driver;
 449         int ret;
 450
 451         fbo = kmalloc(sizeof(*fbo), GFP_KERNEL);
 452         if (!fbo)
 453                 return -ENOMEM;
 454
 455         *fbo = *bo;
 456
 457         /**
 458          * Fix up members that we shouldn't copy directly:
 459          * TODO: Explicit member copy would probably be better here.
 460          */
 461
 462         INIT_LIST_HEAD(&fbo->ddestroy);
 463         INIT_LIST_HEAD(&fbo->lru);
 464         INIT_LIST_HEAD(&fbo->swap);
 465         INIT_LIST_HEAD(&fbo->io_reserve_lru);
 466         drm_vma_node_reset(&fbo->vma_node);
 467         atomic_set(&fbo->cpu_writers, 0);
 468
 469         spin_lock(&bdev->fence_lock);
 470         if (bo->sync_obj)
 471                 fbo->sync_obj = driver->sync_obj_ref(bo->sync_obj);
 472         else
 473                 fbo->sync_obj = NULL;
 474         spin_unlock(&bdev->fence_lock);
 475         kref_init(&fbo->list_kref);
 476         kref_init(&fbo->kref);
 477         fbo->destroy = &ttm_transfered_destroy;
 478         fbo->acc_size = 0;
 479         fbo->resv = &fbo->ttm_resv;
 480         reservation_object_init(fbo->resv);
 481         ret = ww_mutex_trylock(&fbo->resv->lock);
 482         WARN_ON(!ret);
 483
 484         *new_obj = fbo;
 485         return 0;
 486 }
 487
 488 pgprot_t ttm_io_prot(uint32_t caching_flags, pgprot_t tmp)
 489 {
 490 #if defined(__i386__) || defined(__x86_64__)
 491         if (caching_flags & TTM_PL_FLAG_WC)
 492                 tmp = pgprot_writecombine(tmp);
 493         else if (boot_cpu_data.x86 > 3)
 494                 tmp = pgprot_noncached(tmp);
 495
 496 #elif defined(__powerpc__)
 497         if (!(caching_flags & TTM_PL_FLAG_CACHED)) {
 498                 pgprot_val(tmp) |= _PAGE_NO_CACHE;
 499                 if (caching_flags & TTM_PL_FLAG_UNCACHED)
 500                         pgprot_val(tmp) |= _PAGE_GUARDED;
 501         }
 502 #endif
 503 #if defined(__ia64__)
 504         if (caching_flags & TTM_PL_FLAG_WC)
 505                 tmp = pgprot_writecombine(tmp);
 506         else
 507                 tmp = pgprot_noncached(tmp);
 508 #endif
 509 #if defined(__sparc__) || defined(__mips__)
 510         if (!(caching_flags & TTM_PL_FLAG_CACHED))
 511                 tmp = pgprot_noncached(tmp);
 512 #endif
 513         return tmp;
 514 }
 515 EXPORT_SYMBOL(ttm_io_prot);
 516
 517 static int ttm_bo_ioremap(struct ttm_buffer_object *bo,
 518                           unsigned long offset,
 519                           unsigned long size,
 520                           struct ttm_bo_kmap_obj *map)
 521 {
 522         struct ttm_mem_reg *mem = &bo->mem;
 523
 524         if (bo->mem.bus.addr) {
 525                 map->bo_kmap_type = ttm_bo_map_premapped;
 526                 map->virtual = (void *)(((u8 *)bo->mem.bus.addr) + offset);
 527         } else {
 528                 map->bo_kmap_type = ttm_bo_map_iomap;
 529                 if (mem->placement & TTM_PL_FLAG_WC)
 530                         map->virtual = ioremap_wc(bo->mem.bus.base + bo->mem.bus.offset + offset,
 531                                                   size);
 532                 else
 533                         map->virtual = ioremap_nocache(bo->mem.bus.base + bo->mem.bus.offset + offset,
 534                                                        size);
 535         }
 536         return (!map->virtual) ? -ENOMEM : 0;
 537 }
 538
 539 static int ttm_bo_kmap_ttm(struct ttm_buffer_object *bo,
 540                            unsigned long start_page,
 541                            unsigned long num_pages,
 542                            struct ttm_bo_kmap_obj *map)
 543 {
 544         struct ttm_mem_reg *mem = &bo->mem; pgprot_t prot;
 545         struct ttm_tt *ttm = bo->ttm;
 546         int ret;
 547
 548         BUG_ON(!ttm);
 549
 550         if (ttm->state == tt_unpopulated) {
 551                 ret = ttm->bdev->driver->ttm_tt_populate(ttm);
 552                 if (ret)
 553                         return ret;
 554         }
 555
 556         if (num_pages == 1 && (mem->placement & TTM_PL_FLAG_CACHED)) {
 557                 /*
 558                  * We're mapping a single page, and the desired
 559                  * page protection is consistent with the bo.
 560                  */
 561
 562                 map->bo_kmap_type = ttm_bo_map_kmap;
 563                 map->page = ttm->pages[start_page];
 564                 map->virtual = kmap(map->page);
 565         } else {
 566                 /*
 567                  * We need to use vmap to get the desired page protection
 568                  * or to make the buffer object look contiguous.
 569                  */
 570                 prot = (mem->placement & TTM_PL_FLAG_CACHED) ?
 571                         PAGE_KERNEL :
 572                         ttm_io_prot(mem->placement, PAGE_KERNEL);
 573                 map->bo_kmap_type = ttm_bo_map_vmap;
 574                 map->virtual = vmap(ttm->pages + start_page, num_pages,
 575                                     0, prot);
 576         }
 577         return (!map->virtual) ? -ENOMEM : 0;
 578 }
 579
 580 int ttm_bo_kmap(struct ttm_buffer_object *bo,
 581                 unsigned long start_page, unsigned long num_pages,
 582                 struct ttm_bo_kmap_obj *map)
 583 {
 584         struct ttm_mem_type_manager *man =
 585                 &bo->bdev->man[bo->mem.mem_type];
 586         unsigned long offset, size;
 587         int ret;
 588
 589         BUG_ON(!list_empty(&bo->swap));
 590         map->virtual = NULL;
 591         map->bo = bo;
 592         if (num_pages > bo->num_pages)
 593                 return -EINVAL;
 594         if (start_page > bo->num_pages)
 595                 return -EINVAL;
 596 #if 0
 597         if (num_pages > 1 && !capable(CAP_SYS_ADMIN))
 598                 return -EPERM;
 599 #endif
 600         (void) ttm_mem_io_lock(man, false);
 601         ret = ttm_mem_io_reserve(bo->bdev, &bo->mem);
 602         ttm_mem_io_unlock(man);
 603         if (ret)
 604                 return ret;
 605         if (!bo->mem.bus.is_iomem) {
 606                 return ttm_bo_kmap_ttm(bo, start_page, num_pages, map);
 607         } else {
 608                 offset = start_page << PAGE_SHIFT;
 609                 size = num_pages << PAGE_SHIFT;
 610                 return ttm_bo_ioremap(bo, offset, size, map);
 611         }
 612 }
 613 EXPORT_SYMBOL(ttm_bo_kmap);
 614
 615 void ttm_bo_kunmap(struct ttm_bo_kmap_obj *map)
 616 {
 617         struct ttm_buffer_object *bo = map->bo;
 618         struct ttm_mem_type_manager *man =
 619                 &bo->bdev->man[bo->mem.mem_type];
 620
 621         if (!map->virtual)
 622                 return;
 623         switch (map->bo_kmap_type) {
 624         case ttm_bo_map_iomap:
 625                 iounmap(map->virtual);
 626                 break;
 627         case ttm_bo_map_vmap:
 628                 vunmap(map->virtual);
 629                 break;
 630         case ttm_bo_map_kmap:
 631                 kunmap(map->page);
 632                 break;
 633         case ttm_bo_map_premapped:
 634                 break;
 635         default:
 636                 BUG();
 637         }
 638         (void) ttm_mem_io_lock(man, false);
 639         ttm_mem_io_free(map->bo->bdev, &map->bo->mem);
 640         ttm_mem_io_unlock(man);
 641         map->virtual = NULL;
 642         map->page = NULL;
 643 }
 644 EXPORT_SYMBOL(ttm_bo_kunmap);
 645
 646 int ttm_bo_move_accel_cleanup(struct ttm_buffer_object *bo,
 647                               void *sync_obj,
 648                               bool evict,
 649                               bool no_wait_gpu,
 650                               struct ttm_mem_reg *new_mem)
 651 {
 652         struct ttm_bo_device *bdev = bo->bdev;
 653         struct ttm_bo_driver *driver = bdev->driver;
 654         struct ttm_mem_type_manager *man = &bdev->man[new_mem->mem_type];
 655         struct ttm_mem_reg *old_mem = &bo->mem;
 656         int ret;
 657         struct ttm_buffer_object *ghost_obj;
 658         void *tmp_obj = NULL;
 659
 660         spin_lock(&bdev->fence_lock);
 661         if (bo->sync_obj) {
 662                 tmp_obj = bo->sync_obj;
 663                 bo->sync_obj = NULL;
 664         }
 665         bo->sync_obj = driver->sync_obj_ref(sync_obj);
 666         if (evict) {
 667                 ret = ttm_bo_wait(bo, false, false, false);
 668                 spin_unlock(&bdev->fence_lock);
 669                 if (tmp_obj)
 670                         driver->sync_obj_unref(&tmp_obj);
 671                 if (ret)
 672                         return ret;
 673
 674                 if ((man->flags & TTM_MEMTYPE_FLAG_FIXED) &&
 675                     (bo->ttm != NULL)) {
 676                         ttm_tt_unbind(bo->ttm);
 677                         ttm_tt_destroy(bo->ttm);
 678                         bo->ttm = NULL;
 679                 }
 680                 ttm_bo_free_old_node(bo);
 681         } else {
 682                 /**
 683                  * This should help pipeline ordinary buffer moves.
 684                  *
 685                  * Hang old buffer memory on a new buffer object,
 686                  * and leave it to be released when the GPU
 687                  * operation has completed.
 688                  */
 689
 690                 set_bit(TTM_BO_PRIV_FLAG_MOVING, &bo->priv_flags);
 691                 spin_unlock(&bdev->fence_lock);
 692                 if (tmp_obj)
 693                         driver->sync_obj_unref(&tmp_obj);
 694
 695                 ret = ttm_buffer_object_transfer(bo, &ghost_obj);
 696                 if (ret)
 697                         return ret;
 698
 699                 /**
 700                  * If we're not moving to fixed memory, the TTM object
 701                  * needs to stay alive. Otherwhise hang it on the ghost
 702                  * bo to be unbound and destroyed.
 703                  */
 704
 705                 if (!(man->flags & TTM_MEMTYPE_FLAG_FIXED))
 706                         ghost_obj->ttm = NULL;
 707                 else
 708                         bo->ttm = NULL;
 709
 710                 ttm_bo_unreserve(ghost_obj);
 711                 ttm_bo_unref(&ghost_obj);
 712         }
 713
 714         *old_mem = *new_mem;
 715         new_mem->mm_node = NULL;
 716
 717         return 0;
 718 }
 719 EXPORT_SYMBOL(ttm_bo_move_accel_cleanup);