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 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 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         if (old_iomap == NULL && new_iomap == NULL)
 347                 goto out2;
 348         if (old_iomap == NULL && ttm == NULL)
 349                 goto out2;
 350
 351         if (ttm->state == tt_unpopulated) {
 352                 ret = ttm->bdev->driver->ttm_tt_populate(ttm);
 353                 if (ret) {
 354                         /* if we fail here don't nuke the mm node
 355                          * as the bo still owns it */
 356                         old_copy.mm_node = NULL;
 357                         goto out1;
 358                 }
 359         }
 360
 361         add = 0;
 362         dir = 1;
 363
 364         if ((old_mem->mem_type == new_mem->mem_type) &&
 365             (new_mem->start < old_mem->start + old_mem->size)) {
 366                 dir = -1;
 367                 add = new_mem->num_pages - 1;
 368         }
 369
 370         for (i = 0; i < new_mem->num_pages; ++i) {
 371                 page = i * dir + add;
 372                 if (old_iomap == NULL) {
 373                         pgprot_t prot = ttm_io_prot(old_mem->placement,
 374                                                     PAGE_KERNEL);
 375                         ret = ttm_copy_ttm_io_page(ttm, new_iomap, page,
 376                                                    prot);
 377                 } else if (new_iomap == NULL) {
 378                         pgprot_t prot = ttm_io_prot(new_mem->placement,
 379                                                     PAGE_KERNEL);
 380                         ret = ttm_copy_io_ttm_page(ttm, old_iomap, page,
 381                                                    prot);
 382                 } else
 383                         ret = ttm_copy_io_page(new_iomap, old_iomap, page);
 384                 if (ret) {
 385                         /* failing here, means keep old copy as-is */
 386                         old_copy.mm_node = NULL;
 387                         goto out1;
 388                 }
 389         }
 390         mb();
 391 out2:
 392         old_copy = *old_mem;
 393         *old_mem = *new_mem;
 394         new_mem->mm_node = NULL;
 395
 396         if ((man->flags & TTM_MEMTYPE_FLAG_FIXED) && (ttm != NULL)) {
 397                 ttm_tt_unbind(ttm);
 398                 ttm_tt_destroy(ttm);
 399                 bo->ttm = NULL;
 400         }
 401
 402 out1:
 403         ttm_mem_reg_iounmap(bdev, old_mem, new_iomap);
 404 out:
 405         ttm_mem_reg_iounmap(bdev, &old_copy, old_iomap);
 406         ttm_bo_mem_put(bo, &old_copy);
 407         return ret;
 408 }
 409 EXPORT_SYMBOL(ttm_bo_move_memcpy);
 410
 411 static void ttm_transfered_destroy(struct ttm_buffer_object *bo)
 412 {
 413         kfree(bo);
 414 }
 415
 416 /**
 417  * ttm_buffer_object_transfer
 418  *
 419  * @bo: A pointer to a struct ttm_buffer_object.
 420  * @new_obj: A pointer to a pointer to a newly created ttm_buffer_object,
 421  * holding the data of @bo with the old placement.
 422  *
 423  * This is a utility function that may be called after an accelerated move
 424  * has been scheduled. A new buffer object is created as a placeholder for
 425  * the old data while it's being copied. When that buffer object is idle,
 426  * it can be destroyed, releasing the space of the old placement.
 427  * Returns:
 428  * !0: Failure.
 429  */
 430
 431 static int ttm_buffer_object_transfer(struct ttm_buffer_object *bo,
 432                                       struct ttm_buffer_object **new_obj)
 433 {
 434         struct ttm_buffer_object *fbo;
 435         struct ttm_bo_device *bdev = bo->bdev;
 436         struct ttm_bo_driver *driver = bdev->driver;
 437         int ret;
 438
 439         fbo = kmalloc(sizeof(*fbo), GFP_KERNEL);
 440         if (!fbo)
 441                 return -ENOMEM;
 442
 443         *fbo = *bo;
 444
 445         /**
 446          * Fix up members that we shouldn't copy directly:
 447          * TODO: Explicit member copy would probably be better here.
 448          */
 449
 450         INIT_LIST_HEAD(&fbo->ddestroy);
 451         INIT_LIST_HEAD(&fbo->lru);
 452         INIT_LIST_HEAD(&fbo->swap);
 453         INIT_LIST_HEAD(&fbo->io_reserve_lru);
 454         drm_vma_node_reset(&fbo->vma_node);
 455         atomic_set(&fbo->cpu_writers, 0);
 456
 457         spin_lock(&bdev->fence_lock);
 458         if (bo->sync_obj)
 459                 fbo->sync_obj = driver->sync_obj_ref(bo->sync_obj);
 460         else
 461                 fbo->sync_obj = NULL;
 462         spin_unlock(&bdev->fence_lock);
 463         kref_init(&fbo->list_kref);
 464         kref_init(&fbo->kref);
 465         fbo->destroy = &ttm_transfered_destroy;
 466         fbo->acc_size = 0;
 467         fbo->resv = &fbo->ttm_resv;
 468         reservation_object_init(fbo->resv);
 469         ret = ww_mutex_trylock(&fbo->resv->lock);
 470         WARN_ON(!ret);
 471
 472         *new_obj = fbo;
 473         return 0;
 474 }
 475
 476 pgprot_t ttm_io_prot(uint32_t caching_flags, pgprot_t tmp)
 477 {
 478 #if defined(__i386__) || defined(__x86_64__)
 479         if (caching_flags & TTM_PL_FLAG_WC)
 480                 tmp = pgprot_writecombine(tmp);
 481         else if (boot_cpu_data.x86 > 3)
 482                 tmp = pgprot_noncached(tmp);
 483
 484 #elif defined(__powerpc__)
 485         if (!(caching_flags & TTM_PL_FLAG_CACHED)) {
 486                 pgprot_val(tmp) |= _PAGE_NO_CACHE;
 487                 if (caching_flags & TTM_PL_FLAG_UNCACHED)
 488                         pgprot_val(tmp) |= _PAGE_GUARDED;
 489         }
 490 #endif
 491 #if defined(__ia64__)
 492         if (caching_flags & TTM_PL_FLAG_WC)
 493                 tmp = pgprot_writecombine(tmp);
 494         else
 495                 tmp = pgprot_noncached(tmp);
 496 #endif
 497 #if defined(__sparc__) || defined(__mips__)
 498         if (!(caching_flags & TTM_PL_FLAG_CACHED))
 499                 tmp = pgprot_noncached(tmp);
 500 #endif
 501         return tmp;
 502 }
 503 EXPORT_SYMBOL(ttm_io_prot);
 504
 505 static int ttm_bo_ioremap(struct ttm_buffer_object *bo,
 506                           unsigned long offset,
 507                           unsigned long size,
 508                           struct ttm_bo_kmap_obj *map)
 509 {
 510         struct ttm_mem_reg *mem = &bo->mem;
 511
 512         if (bo->mem.bus.addr) {
 513                 map->bo_kmap_type = ttm_bo_map_premapped;
 514                 map->virtual = (void *)(((u8 *)bo->mem.bus.addr) + offset);
 515         } else {
 516                 map->bo_kmap_type = ttm_bo_map_iomap;
 517                 if (mem->placement & TTM_PL_FLAG_WC)
 518                         map->virtual = ioremap_wc(bo->mem.bus.base + bo->mem.bus.offset + offset,
 519                                                   size);
 520                 else
 521                         map->virtual = ioremap_nocache(bo->mem.bus.base + bo->mem.bus.offset + offset,
 522                                                        size);
 523         }
 524         return (!map->virtual) ? -ENOMEM : 0;
 525 }
 526
 527 static int ttm_bo_kmap_ttm(struct ttm_buffer_object *bo,
 528                            unsigned long start_page,
 529                            unsigned long num_pages,
 530                            struct ttm_bo_kmap_obj *map)
 531 {
 532         struct ttm_mem_reg *mem = &bo->mem; pgprot_t prot;
 533         struct ttm_tt *ttm = bo->ttm;
 534         int ret;
 535
 536         BUG_ON(!ttm);
 537
 538         if (ttm->state == tt_unpopulated) {
 539                 ret = ttm->bdev->driver->ttm_tt_populate(ttm);
 540                 if (ret)
 541                         return ret;
 542         }
 543
 544         if (num_pages == 1 && (mem->placement & TTM_PL_FLAG_CACHED)) {
 545                 /*
 546                  * We're mapping a single page, and the desired
 547                  * page protection is consistent with the bo.
 548                  */
 549
 550                 map->bo_kmap_type = ttm_bo_map_kmap;
 551                 map->page = ttm->pages[start_page];
 552                 map->virtual = kmap(map->page);
 553         } else {
 554                 /*
 555                  * We need to use vmap to get the desired page protection
 556                  * or to make the buffer object look contiguous.
 557                  */
 558                 prot = (mem->placement & TTM_PL_FLAG_CACHED) ?
 559                         PAGE_KERNEL :
 560                         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 && !DRM_SUSER(DRM_CURPROC))
 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                               void *sync_obj,
 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_bo_driver *driver = bdev->driver;
 642         struct ttm_mem_type_manager *man = &bdev->man[new_mem->mem_type];
 643         struct ttm_mem_reg *old_mem = &bo->mem;
 644         int ret;
 645         struct ttm_buffer_object *ghost_obj;
 646         void *tmp_obj = NULL;
 647
 648         spin_lock(&bdev->fence_lock);
 649         if (bo->sync_obj) {
 650                 tmp_obj = bo->sync_obj;
 651                 bo->sync_obj = NULL;
 652         }
 653         bo->sync_obj = driver->sync_obj_ref(sync_obj);
 654         if (evict) {
 655                 ret = ttm_bo_wait(bo, false, false, false);
 656                 spin_unlock(&bdev->fence_lock);
 657                 if (tmp_obj)
 658                         driver->sync_obj_unref(&tmp_obj);
 659                 if (ret)
 660                         return ret;
 661
 662                 if ((man->flags & TTM_MEMTYPE_FLAG_FIXED) &&
 663                     (bo->ttm != NULL)) {
 664                         ttm_tt_unbind(bo->ttm);
 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                 set_bit(TTM_BO_PRIV_FLAG_MOVING, &bo->priv_flags);
 679                 spin_unlock(&bdev->fence_lock);
 680                 if (tmp_obj)
 681                         driver->sync_obj_unref(&tmp_obj);
 682
 683                 ret = ttm_buffer_object_transfer(bo, &ghost_obj);
 684                 if (ret)
 685                         return ret;
 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);