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