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 #include <linux/reservation.h>
  41
  42 void ttm_bo_free_old_node(struct ttm_buffer_object *bo)
  43 {
  44         ttm_bo_mem_put(bo, &bo->mem);
  45 }
  46
  47 int ttm_bo_move_ttm(struct ttm_buffer_object *bo,
  48                     bool interruptible, bool no_wait_gpu,
  49                     struct ttm_mem_reg *new_mem)
  50 {
  51         struct ttm_tt *ttm = bo->ttm;
  52         struct ttm_mem_reg *old_mem = &bo->mem;
  53         int ret;
  54
  55         if (old_mem->mem_type != TTM_PL_SYSTEM) {
  56                 ret = ttm_bo_wait(bo, interruptible, no_wait_gpu);
  57
  58                 if (unlikely(ret != 0)) {
  59                         if (ret != -ERESTARTSYS)
  60                                 pr_err("Failed to expire sync object before unbinding TTM\n");
  61                         return ret;
  62                 }
  63
  64                 ttm_tt_unbind(ttm);
  65                 ttm_bo_free_old_node(bo);
  66                 ttm_flag_masked(&old_mem->placement, TTM_PL_FLAG_SYSTEM,
  67                                 TTM_PL_MASK_MEM);
  68                 old_mem->mem_type = TTM_PL_SYSTEM;
  69         }
  70
  71         ret = ttm_tt_set_placement_caching(ttm, new_mem->placement);
  72         if (unlikely(ret != 0))
  73                 return ret;
  74
  75         if (new_mem->mem_type != TTM_PL_SYSTEM) {
  76                 ret = ttm_tt_bind(ttm, new_mem);
  77                 if (unlikely(ret != 0))
  78                         return ret;
  79         }
  80
  81         *old_mem = *new_mem;
  82         new_mem->mm_node = NULL;
  83
  84         return 0;
  85 }
  86 EXPORT_SYMBOL(ttm_bo_move_ttm);
  87
  88 int ttm_mem_io_lock(struct ttm_mem_type_manager *man, bool interruptible)
  89 {
  90         if (likely(man->io_reserve_fastpath))
  91                 return 0;
  92
  93         if (interruptible)
  94                 return mutex_lock_interruptible(&man->io_reserve_mutex);
  95
  96         mutex_lock(&man->io_reserve_mutex);
  97         return 0;
  98 }
  99 EXPORT_SYMBOL(ttm_mem_io_lock);
 100
 101 void ttm_mem_io_unlock(struct ttm_mem_type_manager *man)
 102 {
 103         if (likely(man->io_reserve_fastpath))
 104                 return;
 105
 106         mutex_unlock(&man->io_reserve_mutex);
 107 }
 108 EXPORT_SYMBOL(ttm_mem_io_unlock);
 109
 110 static int ttm_mem_io_evict(struct ttm_mem_type_manager *man)
 111 {
 112         struct ttm_buffer_object *bo;
 113
 114         if (!man->use_io_reserve_lru || list_empty(&man->io_reserve_lru))
 115                 return -EAGAIN;
 116
 117         bo = list_first_entry(&man->io_reserve_lru,
 118                               struct ttm_buffer_object,
 119                               io_reserve_lru);
 120         list_del_init(&bo->io_reserve_lru);
 121         ttm_bo_unmap_virtual_locked(bo);
 122
 123         return 0;
 124 }
 125
 126
 127 int ttm_mem_io_reserve(struct ttm_bo_device *bdev,
 128                        struct ttm_mem_reg *mem)
 129 {
 130         struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
 131         int ret = 0;
 132
 133         if (!bdev->driver->io_mem_reserve)
 134                 return 0;
 135         if (likely(man->io_reserve_fastpath))
 136                 return bdev->driver->io_mem_reserve(bdev, mem);
 137
 138         if (bdev->driver->io_mem_reserve &&
 139             mem->bus.io_reserved_count++ == 0) {
 140 retry:
 141                 ret = bdev->driver->io_mem_reserve(bdev, mem);
 142                 if (ret == -EAGAIN) {
 143                         ret = ttm_mem_io_evict(man);
 144                         if (ret == 0)
 145                                 goto retry;
 146                 }
 147         }
 148         return ret;
 149 }
 150 EXPORT_SYMBOL(ttm_mem_io_reserve);
 151
 152 void ttm_mem_io_free(struct ttm_bo_device *bdev,
 153                      struct ttm_mem_reg *mem)
 154 {
 155         struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
 156
 157         if (likely(man->io_reserve_fastpath))
 158                 return;
 159
 160         if (bdev->driver->io_mem_reserve &&
 161             --mem->bus.io_reserved_count == 0 &&
 162             bdev->driver->io_mem_free)
 163                 bdev->driver->io_mem_free(bdev, mem);
 164
 165 }
 166 EXPORT_SYMBOL(ttm_mem_io_free);
 167
 168 int ttm_mem_io_reserve_vm(struct ttm_buffer_object *bo)
 169 {
 170         struct ttm_mem_reg *mem = &bo->mem;
 171         int ret;
 172
 173         if (!mem->bus.io_reserved_vm) {
 174                 struct ttm_mem_type_manager *man =
 175                         &bo->bdev->man[mem->mem_type];
 176
 177                 ret = ttm_mem_io_reserve(bo->bdev, mem);
 178                 if (unlikely(ret != 0))
 179                         return ret;
 180                 mem->bus.io_reserved_vm = true;
 181                 if (man->use_io_reserve_lru)
 182                         list_add_tail(&bo->io_reserve_lru,
 183                                       &man->io_reserve_lru);
 184         }
 185         return 0;
 186 }
 187
 188 void ttm_mem_io_free_vm(struct ttm_buffer_object *bo)
 189 {
 190         struct ttm_mem_reg *mem = &bo->mem;
 191
 192         if (mem->bus.io_reserved_vm) {
 193                 mem->bus.io_reserved_vm = false;
 194                 list_del_init(&bo->io_reserve_lru);
 195                 ttm_mem_io_free(bo->bdev, mem);
 196         }
 197 }
 198
 199 static int ttm_mem_reg_ioremap(struct ttm_bo_device *bdev, struct ttm_mem_reg *mem,
 200                         void **virtual)
 201 {
 202         struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
 203         int ret;
 204         void *addr;
 205
 206         *virtual = NULL;
 207         (void) ttm_mem_io_lock(man, false);
 208         ret = ttm_mem_io_reserve(bdev, mem);
 209         ttm_mem_io_unlock(man);
 210         if (ret || !mem->bus.is_iomem)
 211                 return ret;
 212
 213         if (mem->bus.addr) {
 214                 addr = mem->bus.addr;
 215         } else {
 216                 if (mem->placement & TTM_PL_FLAG_WC)
 217                         addr = ioremap_wc(mem->bus.base + mem->bus.offset, mem->bus.size);
 218                 else
 219                         addr = ioremap_nocache(mem->bus.base + mem->bus.offset, mem->bus.size);
 220                 if (!addr) {
 221                         (void) ttm_mem_io_lock(man, false);
 222                         ttm_mem_io_free(bdev, mem);
 223                         ttm_mem_io_unlock(man);
 224                         return -ENOMEM;
 225                 }
 226         }
 227         *virtual = addr;
 228         return 0;
 229 }
 230
 231 static void ttm_mem_reg_iounmap(struct ttm_bo_device *bdev, struct ttm_mem_reg *mem,
 232                          void *virtual)
 233 {
 234         struct ttm_mem_type_manager *man;
 235
 236         man = &bdev->man[mem->mem_type];
 237
 238         if (virtual && mem->bus.addr == NULL)
 239                 iounmap(virtual);
 240         (void) ttm_mem_io_lock(man, false);
 241         ttm_mem_io_free(bdev, mem);
 242         ttm_mem_io_unlock(man);
 243 }
 244
 245 static int ttm_copy_io_page(void *dst, void *src, unsigned long page)
 246 {
 247         uint32_t *dstP =
 248             (uint32_t *) ((unsigned long)dst + (page << PAGE_SHIFT));
 249         uint32_t *srcP =
 250             (uint32_t *) ((unsigned long)src + (page << PAGE_SHIFT));
 251
 252         int i;
 253         for (i = 0; i < PAGE_SIZE / sizeof(uint32_t); ++i)
 254                 iowrite32(ioread32(srcP++), dstP++);
 255         return 0;
 256 }
 257
 258 static int ttm_copy_io_ttm_page(struct ttm_tt *ttm, void *src,
 259                                 unsigned long page,
 260                                 pgprot_t prot)
 261 {
 262         struct page *d = ttm->pages[page];
 263         void *dst;
 264
 265         if (!d)
 266                 return -ENOMEM;
 267
 268         src = (void *)((unsigned long)src + (page << PAGE_SHIFT));
 269
 270 #ifdef CONFIG_X86
 271         dst = kmap_atomic_prot(d, prot);
 272 #else
 273         if (pgprot_val(prot) != pgprot_val(PAGE_KERNEL))
 274                 dst = vmap(&d, 1, 0, prot);
 275         else
 276                 dst = kmap(d);
 277 #endif
 278         if (!dst)
 279                 return -ENOMEM;
 280
 281         memcpy_fromio(dst, src, PAGE_SIZE);
 282
 283 #ifdef CONFIG_X86
 284         kunmap_atomic(dst);
 285 #else
 286         if (pgprot_val(prot) != pgprot_val(PAGE_KERNEL))
 287                 vunmap(dst);
 288         else
 289                 kunmap(d);
 290 #endif
 291
 292         return 0;
 293 }
 294
 295 static int ttm_copy_ttm_io_page(struct ttm_tt *ttm, void *dst,
 296                                 unsigned long page,
 297                                 pgprot_t prot)
 298 {
 299         struct page *s = ttm->pages[page];
 300         void *src;
 301
 302         if (!s)
 303                 return -ENOMEM;
 304
 305         dst = (void *)((unsigned long)dst + (page << PAGE_SHIFT));
 306 #ifdef CONFIG_X86
 307         src = kmap_atomic_prot(s, prot);
 308 #else
 309         if (pgprot_val(prot) != pgprot_val(PAGE_KERNEL))
 310                 src = vmap(&s, 1, 0, prot);
 311         else
 312                 src = kmap(s);
 313 #endif
 314         if (!src)
 315                 return -ENOMEM;
 316
 317         memcpy_toio(dst, src, PAGE_SIZE);
 318
 319 #ifdef CONFIG_X86
 320         kunmap_atomic(src);
 321 #else
 322         if (pgprot_val(prot) != pgprot_val(PAGE_KERNEL))
 323                 vunmap(src);
 324         else
 325                 kunmap(s);
 326 #endif
 327
 328         return 0;
 329 }
 330
 331 int ttm_bo_move_memcpy(struct ttm_buffer_object *bo,
 332                        bool interruptible, bool no_wait_gpu,
 333                        struct ttm_mem_reg *new_mem)
 334 {
 335         struct ttm_bo_device *bdev = bo->bdev;
 336         struct ttm_mem_type_manager *man = &bdev->man[new_mem->mem_type];
 337         struct ttm_tt *ttm = bo->ttm;
 338         struct ttm_mem_reg *old_mem = &bo->mem;
 339         struct ttm_mem_reg old_copy = *old_mem;
 340         void *old_iomap;
 341         void *new_iomap;
 342         int ret;
 343         unsigned long i;
 344         unsigned long page;
 345         unsigned long add = 0;
 346         int dir;
 347
 348         ret = ttm_bo_wait(bo, interruptible, no_wait_gpu);
 349         if (ret)
 350                 return ret;
 351
 352         ret = ttm_mem_reg_ioremap(bdev, old_mem, &old_iomap);
 353         if (ret)
 354                 return ret;
 355         ret = ttm_mem_reg_ioremap(bdev, new_mem, &new_iomap);
 356         if (ret)
 357                 goto out;
 358
 359         /*
 360          * Single TTM move. NOP.
 361          */
 362         if (old_iomap == NULL && new_iomap == NULL)
 363                 goto out2;
 364
 365         /*
 366          * Don't move nonexistent data. Clear destination instead.
 367          */
 368         if (old_iomap == NULL &&
 369             (ttm == NULL || (ttm->state == tt_unpopulated &&
 370                              !(ttm->page_flags & TTM_PAGE_FLAG_SWAPPED)))) {
 371                 memset_io(new_iomap, 0, new_mem->num_pages*PAGE_SIZE);
 372                 goto out2;
 373         }
 374
 375         /*
 376          * TTM might be null for moves within the same region.
 377          */
 378         if (ttm && ttm->state == tt_unpopulated) {
 379                 ret = ttm->bdev->driver->ttm_tt_populate(ttm);
 380                 if (ret)
 381                         goto out1;
 382         }
 383
 384         add = 0;
 385         dir = 1;
 386
 387         if ((old_mem->mem_type == new_mem->mem_type) &&
 388             (new_mem->start < old_mem->start + old_mem->size)) {
 389                 dir = -1;
 390                 add = new_mem->num_pages - 1;
 391         }
 392
 393         for (i = 0; i < new_mem->num_pages; ++i) {
 394                 page = i * dir + add;
 395                 if (old_iomap == NULL) {
 396                         pgprot_t prot = ttm_io_prot(old_mem->placement,
 397                                                     PAGE_KERNEL);
 398                         ret = ttm_copy_ttm_io_page(ttm, new_iomap, page,
 399                                                    prot);
 400                 } else if (new_iomap == NULL) {
 401                         pgprot_t prot = ttm_io_prot(new_mem->placement,
 402                                                     PAGE_KERNEL);
 403                         ret = ttm_copy_io_ttm_page(ttm, old_iomap, page,
 404                                                    prot);
 405                 } else
 406                         ret = ttm_copy_io_page(new_iomap, old_iomap, page);
 407                 if (ret)
 408                         goto out1;
 409         }
 410         mb();
 411 out2:
 412         old_copy = *old_mem;
 413         *old_mem = *new_mem;
 414         new_mem->mm_node = NULL;
 415
 416         if (man->flags & TTM_MEMTYPE_FLAG_FIXED) {
 417                 ttm_tt_destroy(ttm);
 418                 bo->ttm = NULL;
 419         }
 420
 421 out1:
 422         ttm_mem_reg_iounmap(bdev, old_mem, new_iomap);
 423 out:
 424         ttm_mem_reg_iounmap(bdev, &old_copy, old_iomap);
 425
 426         /*
 427          * On error, keep the mm node!
 428          */
 429         if (!ret)
 430                 ttm_bo_mem_put(bo, &old_copy);
 431         return ret;
 432 }
 433 EXPORT_SYMBOL(ttm_bo_move_memcpy);
 434
 435 static void ttm_transfered_destroy(struct ttm_buffer_object *bo)
 436 {
 437         kfree(bo);
 438 }
 439
 440 /**
 441  * ttm_buffer_object_transfer
 442  *
 443  * @bo: A pointer to a struct ttm_buffer_object.
 444  * @new_obj: A pointer to a pointer to a newly created ttm_buffer_object,
 445  * holding the data of @bo with the old placement.
 446  *
 447  * This is a utility function that may be called after an accelerated move
 448  * has been scheduled. A new buffer object is created as a placeholder for
 449  * the old data while it's being copied. When that buffer object is idle,
 450  * it can be destroyed, releasing the space of the old placement.
 451  * Returns:
 452  * !0: Failure.
 453  */
 454
 455 static int ttm_buffer_object_transfer(struct ttm_buffer_object *bo,
 456                                       struct ttm_buffer_object **new_obj)
 457 {
 458         struct ttm_buffer_object *fbo;
 459         int ret;
 460
 461         fbo = kmalloc(sizeof(*fbo), GFP_KERNEL);
 462         if (!fbo)
 463                 return -ENOMEM;
 464
 465         *fbo = *bo;
 466
 467         /**
 468          * Fix up members that we shouldn't copy directly:
 469          * TODO: Explicit member copy would probably be better here.
 470          */
 471
 472         INIT_LIST_HEAD(&fbo->ddestroy);
 473         INIT_LIST_HEAD(&fbo->lru);
 474         INIT_LIST_HEAD(&fbo->swap);
 475         INIT_LIST_HEAD(&fbo->io_reserve_lru);
 476         mutex_init(&fbo->wu_mutex);
 477         fbo->moving = NULL;
 478         drm_vma_node_reset(&fbo->vma_node);
 479         atomic_set(&fbo->cpu_writers, 0);
 480
 481         kref_init(&fbo->list_kref);
 482         kref_init(&fbo->kref);
 483         fbo->destroy = &ttm_transfered_destroy;
 484         fbo->acc_size = 0;
 485         fbo->resv = &fbo->ttm_resv;
 486         reservation_object_init(fbo->resv);
 487         ret = ww_mutex_trylock(&fbo->resv->lock);
 488         WARN_ON(!ret);
 489
 490         *new_obj = fbo;
 491         return 0;
 492 }
 493
 494 pgprot_t ttm_io_prot(uint32_t caching_flags, pgprot_t tmp)
 495 {
 496         /* Cached mappings need no adjustment */
 497         if (caching_flags & TTM_PL_FLAG_CACHED)
 498                 return tmp;
 499
 500 #if defined(__i386__) || defined(__x86_64__)
 501         if (caching_flags & TTM_PL_FLAG_WC)
 502                 tmp = pgprot_writecombine(tmp);
 503         else if (boot_cpu_data.x86 > 3)
 504                 tmp = pgprot_noncached(tmp);
 505 #endif
 506 #if defined(__ia64__) || defined(__arm__) || defined(__aarch64__) || \
 507     defined(__powerpc__)
 508         if (caching_flags & TTM_PL_FLAG_WC)
 509                 tmp = pgprot_writecombine(tmp);
 510         else
 511                 tmp = pgprot_noncached(tmp);
 512 #endif
 513 #if defined(__sparc__) || defined(__mips__)
 514         tmp = pgprot_noncached(tmp);
 515 #endif
 516         return tmp;
 517 }
 518 EXPORT_SYMBOL(ttm_io_prot);
 519
 520 static int ttm_bo_ioremap(struct ttm_buffer_object *bo,
 521                           unsigned long offset,
 522                           unsigned long size,
 523                           struct ttm_bo_kmap_obj *map)
 524 {
 525         struct ttm_mem_reg *mem = &bo->mem;
 526
 527         if (bo->mem.bus.addr) {
 528                 map->bo_kmap_type = ttm_bo_map_premapped;
 529                 map->virtual = (void *)(((u8 *)bo->mem.bus.addr) + offset);
 530         } else {
 531                 map->bo_kmap_type = ttm_bo_map_iomap;
 532                 if (mem->placement & TTM_PL_FLAG_WC)
 533                         map->virtual = ioremap_wc(bo->mem.bus.base + bo->mem.bus.offset + offset,
 534                                                   size);
 535                 else
 536                         map->virtual = ioremap_nocache(bo->mem.bus.base + bo->mem.bus.offset + offset,
 537                                                        size);
 538         }
 539         return (!map->virtual) ? -ENOMEM : 0;
 540 }
 541
 542 static int ttm_bo_kmap_ttm(struct ttm_buffer_object *bo,
 543                            unsigned long start_page,
 544                            unsigned long num_pages,
 545                            struct ttm_bo_kmap_obj *map)
 546 {
 547         struct ttm_mem_reg *mem = &bo->mem; pgprot_t prot;
 548         struct ttm_tt *ttm = bo->ttm;
 549         int ret;
 550
 551         BUG_ON(!ttm);
 552
 553         if (ttm->state == tt_unpopulated) {
 554                 ret = ttm->bdev->driver->ttm_tt_populate(ttm);
 555                 if (ret)
 556                         return ret;
 557         }
 558
 559         if (num_pages == 1 && (mem->placement & TTM_PL_FLAG_CACHED)) {
 560                 /*
 561                  * We're mapping a single page, and the desired
 562                  * page protection is consistent with the bo.
 563                  */
 564
 565                 map->bo_kmap_type = ttm_bo_map_kmap;
 566                 map->page = ttm->pages[start_page];
 567                 map->virtual = kmap(map->page);
 568         } else {
 569                 /*
 570                  * We need to use vmap to get the desired page protection
 571                  * or to make the buffer object look contiguous.
 572                  */
 573                 prot = ttm_io_prot(mem->placement, PAGE_KERNEL);
 574                 map->bo_kmap_type = ttm_bo_map_vmap;
 575                 map->virtual = vmap(ttm->pages + start_page, num_pages,
 576                                     0, prot);
 577         }
 578         return (!map->virtual) ? -ENOMEM : 0;
 579 }
 580
 581 int ttm_bo_kmap(struct ttm_buffer_object *bo,
 582                 unsigned long start_page, unsigned long num_pages,
 583                 struct ttm_bo_kmap_obj *map)
 584 {
 585         struct ttm_mem_type_manager *man =
 586                 &bo->bdev->man[bo->mem.mem_type];
 587         unsigned long offset, size;
 588         int ret;
 589
 590         BUG_ON(!list_empty(&bo->swap));
 591         map->virtual = NULL;
 592         map->bo = bo;
 593         if (num_pages > bo->num_pages)
 594                 return -EINVAL;
 595         if (start_page > bo->num_pages)
 596                 return -EINVAL;
 597 #if 0
 598         if (num_pages > 1 && !capable(CAP_SYS_ADMIN))
 599                 return -EPERM;
 600 #endif
 601         (void) ttm_mem_io_lock(man, false);
 602         ret = ttm_mem_io_reserve(bo->bdev, &bo->mem);
 603         ttm_mem_io_unlock(man);
 604         if (ret)
 605                 return ret;
 606         if (!bo->mem.bus.is_iomem) {
 607                 return ttm_bo_kmap_ttm(bo, start_page, num_pages, map);
 608         } else {
 609                 offset = start_page << PAGE_SHIFT;
 610                 size = num_pages << PAGE_SHIFT;
 611                 return ttm_bo_ioremap(bo, offset, size, map);
 612         }
 613 }
 614 EXPORT_SYMBOL(ttm_bo_kmap);
 615
 616 void ttm_bo_kunmap(struct ttm_bo_kmap_obj *map)
 617 {
 618         struct ttm_buffer_object *bo = map->bo;
 619         struct ttm_mem_type_manager *man =
 620                 &bo->bdev->man[bo->mem.mem_type];
 621
 622         if (!map->virtual)
 623                 return;
 624         switch (map->bo_kmap_type) {
 625         case ttm_bo_map_iomap:
 626                 iounmap(map->virtual);
 627                 break;
 628         case ttm_bo_map_vmap:
 629                 vunmap(map->virtual);
 630                 break;
 631         case ttm_bo_map_kmap:
 632                 kunmap(map->page);
 633                 break;
 634         case ttm_bo_map_premapped:
 635                 break;
 636         default:
 637                 BUG();
 638         }
 639         (void) ttm_mem_io_lock(man, false);
 640         ttm_mem_io_free(map->bo->bdev, &map->bo->mem);
 641         ttm_mem_io_unlock(man);
 642         map->virtual = NULL;
 643         map->page = NULL;
 644 }
 645 EXPORT_SYMBOL(ttm_bo_kunmap);
 646
 647 int ttm_bo_move_accel_cleanup(struct ttm_buffer_object *bo,
 648                               struct fence *fence,
 649                               bool evict,
 650                               struct ttm_mem_reg *new_mem)
 651 {
 652         struct ttm_bo_device *bdev = bo->bdev;
 653         struct ttm_mem_type_manager *man = &bdev->man[new_mem->mem_type];
 654         struct ttm_mem_reg *old_mem = &bo->mem;
 655         int ret;
 656         struct ttm_buffer_object *ghost_obj;
 657
 658         reservation_object_add_excl_fence(bo->resv, fence);
 659         if (evict) {
 660                 ret = ttm_bo_wait(bo, false, false);
 661                 if (ret)
 662                         return ret;
 663
 664                 if (man->flags & TTM_MEMTYPE_FLAG_FIXED) {
 665                         ttm_tt_destroy(bo->ttm);
 666                         bo->ttm = NULL;
 667                 }
 668                 ttm_bo_free_old_node(bo);
 669         } else {
 670                 /**
 671                  * This should help pipeline ordinary buffer moves.
 672                  *
 673                  * Hang old buffer memory on a new buffer object,
 674                  * and leave it to be released when the GPU
 675                  * operation has completed.
 676                  */
 677
 678                 fence_put(bo->moving);
 679                 bo->moving = fence_get(fence);
 680
 681                 ret = ttm_buffer_object_transfer(bo, &ghost_obj);
 682                 if (ret)
 683                         return ret;
 684
 685                 reservation_object_add_excl_fence(ghost_obj->resv, fence);
 686
 687                 /**
 688                  * If we're not moving to fixed memory, the TTM object
 689                  * needs to stay alive. Otherwhise hang it on the ghost
 690                  * bo to be unbound and destroyed.
 691                  */
 692
 693                 if (!(man->flags & TTM_MEMTYPE_FLAG_FIXED))
 694                         ghost_obj->ttm = NULL;
 695                 else
 696                         bo->ttm = NULL;
 697
 698                 ttm_bo_unreserve(ghost_obj);
 699                 ttm_bo_unref(&ghost_obj);
 700         }
 701
 702         *old_mem = *new_mem;
 703         new_mem->mm_node = NULL;
 704
 705         return 0;
 706 }
 707 EXPORT_SYMBOL(ttm_bo_move_accel_cleanup);
 708
 709 int ttm_bo_pipeline_move(struct ttm_buffer_object *bo,
 710                          struct fence *fence, bool evict,
 711                          struct ttm_mem_reg *new_mem)
 712 {
 713         struct ttm_bo_device *bdev = bo->bdev;
 714         struct ttm_mem_reg *old_mem = &bo->mem;
 715
 716         struct ttm_mem_type_manager *from = &bdev->man[old_mem->mem_type];
 717         struct ttm_mem_type_manager *to = &bdev->man[new_mem->mem_type];
 718
 719         int ret;
 720
 721         reservation_object_add_excl_fence(bo->resv, fence);
 722
 723         if (!evict) {
 724                 struct ttm_buffer_object *ghost_obj;
 725
 726                 /**
 727                  * This should help pipeline ordinary buffer moves.
 728                  *
 729                  * Hang old buffer memory on a new buffer object,
 730                  * and leave it to be released when the GPU
 731                  * operation has completed.
 732                  */
 733
 734                 fence_put(bo->moving);
 735                 bo->moving = fence_get(fence);
 736
 737                 ret = ttm_buffer_object_transfer(bo, &ghost_obj);
 738                 if (ret)
 739                         return ret;
 740
 741                 reservation_object_add_excl_fence(ghost_obj->resv, fence);
 742
 743                 /**
 744                  * If we're not moving to fixed memory, the TTM object
 745                  * needs to stay alive. Otherwhise hang it on the ghost
 746                  * bo to be unbound and destroyed.
 747                  */
 748
 749                 if (!(to->flags & TTM_MEMTYPE_FLAG_FIXED))
 750                         ghost_obj->ttm = NULL;
 751                 else
 752                         bo->ttm = NULL;
 753
 754                 ttm_bo_unreserve(ghost_obj);
 755                 ttm_bo_unref(&ghost_obj);
 756
 757         } else if (from->flags & TTM_MEMTYPE_FLAG_FIXED) {
 758
 759                 /**
 760                  * BO doesn't have a TTM we need to bind/unbind. Just remember
 761                  * this eviction and free up the allocation
 762                  */
 763
 764                 spin_lock(&from->move_lock);
 765                 if (!from->move || fence_is_later(fence, from->move)) {
 766                         fence_put(from->move);
 767                         from->move = fence_get(fence);
 768                 }
 769                 spin_unlock(&from->move_lock);
 770
 771                 ttm_bo_free_old_node(bo);
 772
 773                 fence_put(bo->moving);
 774                 bo->moving = fence_get(fence);
 775
 776         } else {
 777                 /**
 778                  * Last resort, wait for the move to be completed.
 779                  *
 780                  * Should never happen in pratice.
 781                  */
 782
 783                 ret = ttm_bo_wait(bo, false, false);
 784                 if (ret)
 785                         return ret;
 786
 787                 if (to->flags & TTM_MEMTYPE_FLAG_FIXED) {
 788                         ttm_tt_destroy(bo->ttm);
 789                         bo->ttm = NULL;
 790                 }
 791                 ttm_bo_free_old_node(bo);
 792         }
 793
 794         *old_mem = *new_mem;
 795         new_mem->mm_node = NULL;
 796
 797         return 0;
 798 }
 799 EXPORT_SYMBOL(ttm_bo_pipeline_move);