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         fbo->moving = NULL;
 477         drm_vma_node_reset(&fbo->vma_node);
 478         atomic_set(&fbo->cpu_writers, 0);
 479
 480         kref_init(&fbo->list_kref);
 481         kref_init(&fbo->kref);
 482         fbo->destroy = &ttm_transfered_destroy;
 483         fbo->acc_size = 0;
 484         fbo->resv = &fbo->ttm_resv;
 485         reservation_object_init(fbo->resv);
 486         ret = ww_mutex_trylock(&fbo->resv->lock);
 487         WARN_ON(!ret);
 488
 489         *new_obj = fbo;
 490         return 0;
 491 }
 492
 493 pgprot_t ttm_io_prot(uint32_t caching_flags, pgprot_t tmp)
 494 {
 495         /* Cached mappings need no adjustment */
 496         if (caching_flags & TTM_PL_FLAG_CACHED)
 497                 return tmp;
 498
 499 #if defined(__i386__) || defined(__x86_64__)
 500         if (caching_flags & TTM_PL_FLAG_WC)
 501                 tmp = pgprot_writecombine(tmp);
 502         else if (boot_cpu_data.x86 > 3)
 503                 tmp = pgprot_noncached(tmp);
 504 #endif
 505 #if defined(__ia64__) || defined(__arm__) || defined(__aarch64__) || \
 506     defined(__powerpc__)
 507         if (caching_flags & TTM_PL_FLAG_WC)
 508                 tmp = pgprot_writecombine(tmp);
 509         else
 510                 tmp = pgprot_noncached(tmp);
 511 #endif
 512 #if defined(__sparc__) || defined(__mips__)
 513         tmp = pgprot_noncached(tmp);
 514 #endif
 515         return tmp;
 516 }
 517 EXPORT_SYMBOL(ttm_io_prot);
 518
 519 static int ttm_bo_ioremap(struct ttm_buffer_object *bo,
 520                           unsigned long offset,
 521                           unsigned long size,
 522                           struct ttm_bo_kmap_obj *map)
 523 {
 524         struct ttm_mem_reg *mem = &bo->mem;
 525
 526         if (bo->mem.bus.addr) {
 527                 map->bo_kmap_type = ttm_bo_map_premapped;
 528                 map->virtual = (void *)(((u8 *)bo->mem.bus.addr) + offset);
 529         } else {
 530                 map->bo_kmap_type = ttm_bo_map_iomap;
 531                 if (mem->placement & TTM_PL_FLAG_WC)
 532                         map->virtual = ioremap_wc(bo->mem.bus.base + bo->mem.bus.offset + offset,
 533                                                   size);
 534                 else
 535                         map->virtual = ioremap_nocache(bo->mem.bus.base + bo->mem.bus.offset + offset,
 536                                                        size);
 537         }
 538         return (!map->virtual) ? -ENOMEM : 0;
 539 }
 540
 541 static int ttm_bo_kmap_ttm(struct ttm_buffer_object *bo,
 542                            unsigned long start_page,
 543                            unsigned long num_pages,
 544                            struct ttm_bo_kmap_obj *map)
 545 {
 546         struct ttm_mem_reg *mem = &bo->mem; pgprot_t prot;
 547         struct ttm_tt *ttm = bo->ttm;
 548         int ret;
 549
 550         BUG_ON(!ttm);
 551
 552         if (ttm->state == tt_unpopulated) {
 553                 ret = ttm->bdev->driver->ttm_tt_populate(ttm);
 554                 if (ret)
 555                         return ret;
 556         }
 557
 558         if (num_pages == 1 && (mem->placement & TTM_PL_FLAG_CACHED)) {
 559                 /*
 560                  * We're mapping a single page, and the desired
 561                  * page protection is consistent with the bo.
 562                  */
 563
 564                 map->bo_kmap_type = ttm_bo_map_kmap;
 565                 map->page = ttm->pages[start_page];
 566                 map->virtual = kmap(map->page);
 567         } else {
 568                 /*
 569                  * We need to use vmap to get the desired page protection
 570                  * or to make the buffer object look contiguous.
 571                  */
 572                 prot = 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                               struct fence *fence,
 648                               bool evict,
 649                               struct ttm_mem_reg *new_mem)
 650 {
 651         struct ttm_bo_device *bdev = bo->bdev;
 652         struct ttm_mem_type_manager *man = &bdev->man[new_mem->mem_type];
 653         struct ttm_mem_reg *old_mem = &bo->mem;
 654         int ret;
 655         struct ttm_buffer_object *ghost_obj;
 656
 657         reservation_object_add_excl_fence(bo->resv, fence);
 658         if (evict) {
 659                 ret = ttm_bo_wait(bo, false, false);
 660                 if (ret)
 661                         return ret;
 662
 663                 if (man->flags & TTM_MEMTYPE_FLAG_FIXED) {
 664                         ttm_tt_destroy(bo->ttm);
 665                         bo->ttm = NULL;
 666                 }
 667                 ttm_bo_free_old_node(bo);
 668         } else {
 669                 /**
 670                  * This should help pipeline ordinary buffer moves.
 671                  *
 672                  * Hang old buffer memory on a new buffer object,
 673                  * and leave it to be released when the GPU
 674                  * operation has completed.
 675                  */
 676
 677                 fence_put(bo->moving);
 678                 bo->moving = fence_get(fence);
 679
 680                 ret = ttm_buffer_object_transfer(bo, &ghost_obj);
 681                 if (ret)
 682                         return ret;
 683
 684                 reservation_object_add_excl_fence(ghost_obj->resv, fence);
 685
 686                 /**
 687                  * If we're not moving to fixed memory, the TTM object
 688                  * needs to stay alive. Otherwhise hang it on the ghost
 689                  * bo to be unbound and destroyed.
 690                  */
 691
 692                 if (!(man->flags & TTM_MEMTYPE_FLAG_FIXED))
 693                         ghost_obj->ttm = NULL;
 694                 else
 695                         bo->ttm = NULL;
 696
 697                 ttm_bo_unreserve(ghost_obj);
 698                 ttm_bo_unref(&ghost_obj);
 699         }
 700
 701         *old_mem = *new_mem;
 702         new_mem->mm_node = NULL;
 703
 704         return 0;
 705 }
 706 EXPORT_SYMBOL(ttm_bo_move_accel_cleanup);
 707
 708 int ttm_bo_pipeline_move(struct ttm_buffer_object *bo,
 709                          struct fence *fence, bool evict,
 710                          struct ttm_mem_reg *new_mem)
 711 {
 712         struct ttm_bo_device *bdev = bo->bdev;
 713         struct ttm_mem_reg *old_mem = &bo->mem;
 714
 715         struct ttm_mem_type_manager *from = &bdev->man[old_mem->mem_type];
 716         struct ttm_mem_type_manager *to = &bdev->man[new_mem->mem_type];
 717
 718         int ret;
 719
 720         reservation_object_add_excl_fence(bo->resv, fence);
 721
 722         if (!evict) {
 723                 struct ttm_buffer_object *ghost_obj;
 724
 725                 /**
 726                  * This should help pipeline ordinary buffer moves.
 727                  *
 728                  * Hang old buffer memory on a new buffer object,
 729                  * and leave it to be released when the GPU
 730                  * operation has completed.
 731                  */
 732
 733                 fence_put(bo->moving);
 734                 bo->moving = fence_get(fence);
 735
 736                 ret = ttm_buffer_object_transfer(bo, &ghost_obj);
 737                 if (ret)
 738                         return ret;
 739
 740                 reservation_object_add_excl_fence(ghost_obj->resv, fence);
 741
 742                 /**
 743                  * If we're not moving to fixed memory, the TTM object
 744                  * needs to stay alive. Otherwhise hang it on the ghost
 745                  * bo to be unbound and destroyed.
 746                  */
 747
 748                 if (!(to->flags & TTM_MEMTYPE_FLAG_FIXED))
 749                         ghost_obj->ttm = NULL;
 750                 else
 751                         bo->ttm = NULL;
 752
 753                 ttm_bo_unreserve(ghost_obj);
 754                 ttm_bo_unref(&ghost_obj);
 755
 756         } else if (from->flags & TTM_MEMTYPE_FLAG_FIXED) {
 757
 758                 /**
 759                  * BO doesn't have a TTM we need to bind/unbind. Just remember
 760                  * this eviction and free up the allocation
 761                  */
 762
 763                 spin_lock(&from->move_lock);
 764                 if (!from->move || fence_is_later(fence, from->move)) {
 765                         fence_put(from->move);
 766                         from->move = fence_get(fence);
 767                 }
 768                 spin_unlock(&from->move_lock);
 769
 770                 ttm_bo_free_old_node(bo);
 771
 772                 fence_put(bo->moving);
 773                 bo->moving = fence_get(fence);
 774
 775         } else {
 776                 /**
 777                  * Last resort, wait for the move to be completed.
 778                  *
 779                  * Should never happen in pratice.
 780                  */
 781
 782                 ret = ttm_bo_wait(bo, false, false);
 783                 if (ret)
 784                         return ret;
 785
 786                 if (to->flags & TTM_MEMTYPE_FLAG_FIXED) {
 787                         ttm_tt_destroy(bo->ttm);
 788                         bo->ttm = NULL;
 789                 }
 790                 ttm_bo_free_old_node(bo);
 791         }
 792
 793         *old_mem = *new_mem;
 794         new_mem->mm_node = NULL;
 795
 796         return 0;
 797 }
 798 EXPORT_SYMBOL(ttm_bo_pipeline_move);