drivers/gpu/drm/ttm/ttm_bo.c

   1 /**************************************************************************
   2  *
   3  * Copyright (c) 2006-2009 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 "ttm/ttm_module.h"
  32 #include "ttm/ttm_bo_driver.h"
  33 #include "ttm/ttm_placement.h"
  34 #include <linux/jiffies.h>
  35 #include <linux/slab.h>
  36 #include <linux/sched.h>
  37 #include <linux/mm.h>
  38 #include <linux/file.h>
  39 #include <linux/module.h>
  40
  41 #define TTM_ASSERT_LOCKED(param)
  42 #define TTM_DEBUG(fmt, arg...)
  43 #define TTM_BO_HASH_ORDER 13
  44
  45 static int ttm_bo_setup_vm(struct ttm_buffer_object *bo);
  46 static void ttm_bo_unmap_virtual(struct ttm_buffer_object *bo);
  47 static int ttm_bo_swapout(struct ttm_mem_shrink *shrink);
  48
  49 static inline uint32_t ttm_bo_type_flags(unsigned type)
  50 {
  51         return 1 << (type);
  52 }
  53
  54 static void ttm_bo_release_list(struct kref *list_kref)
  55 {
  56         struct ttm_buffer_object *bo =
  57             container_of(list_kref, struct ttm_buffer_object, list_kref);
  58         struct ttm_bo_device *bdev = bo->bdev;
  59
  60         BUG_ON(atomic_read(&bo->list_kref.refcount));
  61         BUG_ON(atomic_read(&bo->kref.refcount));
  62         BUG_ON(atomic_read(&bo->cpu_writers));
  63         BUG_ON(bo->sync_obj != NULL);
  64         BUG_ON(bo->mem.mm_node != NULL);
  65         BUG_ON(!list_empty(&bo->lru));
  66         BUG_ON(!list_empty(&bo->ddestroy));
  67
  68         if (bo->ttm)
  69                 ttm_tt_destroy(bo->ttm);
  70         if (bo->destroy)
  71                 bo->destroy(bo);
  72         else {
  73                 ttm_mem_global_free(bdev->mem_glob, bo->acc_size, false);
  74                 kfree(bo);
  75         }
  76 }
  77
  78 int ttm_bo_wait_unreserved(struct ttm_buffer_object *bo, bool interruptible)
  79 {
  80
  81         if (interruptible) {
  82                 int ret = 0;
  83
  84                 ret = wait_event_interruptible(bo->event_queue,
  85                                                atomic_read(&bo->reserved) == 0);
  86                 if (unlikely(ret != 0))
  87                         return -ERESTART;
  88         } else {
  89                 wait_event(bo->event_queue, atomic_read(&bo->reserved) == 0);
  90         }
  91         return 0;
  92 }
  93
  94 static void ttm_bo_add_to_lru(struct ttm_buffer_object *bo)
  95 {
  96         struct ttm_bo_device *bdev = bo->bdev;
  97         struct ttm_mem_type_manager *man;
  98
  99         BUG_ON(!atomic_read(&bo->reserved));
 100
 101         if (!(bo->mem.placement & TTM_PL_FLAG_NO_EVICT)) {
 102
 103                 BUG_ON(!list_empty(&bo->lru));
 104
 105                 man = &bdev->man[bo->mem.mem_type];
 106                 list_add_tail(&bo->lru, &man->lru);
 107                 kref_get(&bo->list_kref);
 108
 109                 if (bo->ttm != NULL) {
 110                         list_add_tail(&bo->swap, &bdev->swap_lru);
 111                         kref_get(&bo->list_kref);
 112                 }
 113         }
 114 }
 115
 116 /**
 117  * Call with the lru_lock held.
 118  */
 119
 120 static int ttm_bo_del_from_lru(struct ttm_buffer_object *bo)
 121 {
 122         int put_count = 0;
 123
 124         if (!list_empty(&bo->swap)) {
 125                 list_del_init(&bo->swap);
 126                 ++put_count;
 127         }
 128         if (!list_empty(&bo->lru)) {
 129                 list_del_init(&bo->lru);
 130                 ++put_count;
 131         }
 132
 133         /*
 134          * TODO: Add a driver hook to delete from
 135          * driver-specific LRU's here.
 136          */
 137
 138         return put_count;
 139 }
 140
 141 int ttm_bo_reserve_locked(struct ttm_buffer_object *bo,
 142                           bool interruptible,
 143                           bool no_wait, bool use_sequence, uint32_t sequence)
 144 {
 145         struct ttm_bo_device *bdev = bo->bdev;
 146         int ret;
 147
 148         while (unlikely(atomic_cmpxchg(&bo->reserved, 0, 1) != 0)) {
 149                 if (use_sequence && bo->seq_valid &&
 150                         (sequence - bo->val_seq < (1 << 31))) {
 151                         return -EAGAIN;
 152                 }
 153
 154                 if (no_wait)
 155                         return -EBUSY;
 156
 157                 spin_unlock(&bdev->lru_lock);
 158                 ret = ttm_bo_wait_unreserved(bo, interruptible);
 159                 spin_lock(&bdev->lru_lock);
 160
 161                 if (unlikely(ret))
 162                         return ret;
 163         }
 164
 165         if (use_sequence) {
 166                 bo->val_seq = sequence;
 167                 bo->seq_valid = true;
 168         } else {
 169                 bo->seq_valid = false;
 170         }
 171
 172         return 0;
 173 }
 174 EXPORT_SYMBOL(ttm_bo_reserve);
 175
 176 static void ttm_bo_ref_bug(struct kref *list_kref)
 177 {
 178         BUG();
 179 }
 180
 181 int ttm_bo_reserve(struct ttm_buffer_object *bo,
 182                    bool interruptible,
 183                    bool no_wait, bool use_sequence, uint32_t sequence)
 184 {
 185         struct ttm_bo_device *bdev = bo->bdev;
 186         int put_count = 0;
 187         int ret;
 188
 189         spin_lock(&bdev->lru_lock);
 190         ret = ttm_bo_reserve_locked(bo, interruptible, no_wait, use_sequence,
 191                                     sequence);
 192         if (likely(ret == 0))
 193                 put_count = ttm_bo_del_from_lru(bo);
 194         spin_unlock(&bdev->lru_lock);
 195
 196         while (put_count--)
 197                 kref_put(&bo->list_kref, ttm_bo_ref_bug);
 198
 199         return ret;
 200 }
 201
 202 void ttm_bo_unreserve(struct ttm_buffer_object *bo)
 203 {
 204         struct ttm_bo_device *bdev = bo->bdev;
 205
 206         spin_lock(&bdev->lru_lock);
 207         ttm_bo_add_to_lru(bo);
 208         atomic_set(&bo->reserved, 0);
 209         wake_up_all(&bo->event_queue);
 210         spin_unlock(&bdev->lru_lock);
 211 }
 212 EXPORT_SYMBOL(ttm_bo_unreserve);
 213
 214 /*
 215  * Call bo->mutex locked.
 216  */
 217
 218 static int ttm_bo_add_ttm(struct ttm_buffer_object *bo, bool zero_alloc)
 219 {
 220         struct ttm_bo_device *bdev = bo->bdev;
 221         int ret = 0;
 222         uint32_t page_flags = 0;
 223
 224         TTM_ASSERT_LOCKED(&bo->mutex);
 225         bo->ttm = NULL;
 226
 227         switch (bo->type) {
 228         case ttm_bo_type_device:
 229                 if (zero_alloc)
 230                         page_flags |= TTM_PAGE_FLAG_ZERO_ALLOC;
 231         case ttm_bo_type_kernel:
 232                 bo->ttm = ttm_tt_create(bdev, bo->num_pages << PAGE_SHIFT,
 233                                         page_flags, bdev->dummy_read_page);
 234                 if (unlikely(bo->ttm == NULL))
 235                         ret = -ENOMEM;
 236                 break;
 237         case ttm_bo_type_user:
 238                 bo->ttm = ttm_tt_create(bdev, bo->num_pages << PAGE_SHIFT,
 239                                         page_flags | TTM_PAGE_FLAG_USER,
 240                                         bdev->dummy_read_page);
 241                 if (unlikely(bo->ttm == NULL))
 242                         ret = -ENOMEM;
 243                 break;
 244
 245                 ret = ttm_tt_set_user(bo->ttm, current,
 246                                       bo->buffer_start, bo->num_pages);
 247                 if (unlikely(ret != 0))
 248                         ttm_tt_destroy(bo->ttm);
 249                 break;
 250         default:
 251                 printk(KERN_ERR TTM_PFX "Illegal buffer object type\n");
 252                 ret = -EINVAL;
 253                 break;
 254         }
 255
 256         return ret;
 257 }
 258
 259 static int ttm_bo_handle_move_mem(struct ttm_buffer_object *bo,
 260                                   struct ttm_mem_reg *mem,
 261                                   bool evict, bool interruptible, bool no_wait)
 262 {
 263         struct ttm_bo_device *bdev = bo->bdev;
 264         bool old_is_pci = ttm_mem_reg_is_pci(bdev, &bo->mem);
 265         bool new_is_pci = ttm_mem_reg_is_pci(bdev, mem);
 266         struct ttm_mem_type_manager *old_man = &bdev->man[bo->mem.mem_type];
 267         struct ttm_mem_type_manager *new_man = &bdev->man[mem->mem_type];
 268         int ret = 0;
 269
 270         if (old_is_pci || new_is_pci ||
 271             ((mem->placement & bo->mem.placement & TTM_PL_MASK_CACHING) == 0))
 272                 ttm_bo_unmap_virtual(bo);
 273
 274         /*
 275          * Create and bind a ttm if required.
 276          */
 277
 278         if (!(new_man->flags & TTM_MEMTYPE_FLAG_FIXED) && (bo->ttm == NULL)) {
 279                 ret = ttm_bo_add_ttm(bo, false);
 280                 if (ret)
 281                         goto out_err;
 282
 283                 ret = ttm_tt_set_placement_caching(bo->ttm, mem->placement);
 284                 if (ret)
 285                         goto out_err;
 286
 287                 if (mem->mem_type != TTM_PL_SYSTEM) {
 288                         ret = ttm_tt_bind(bo->ttm, mem);
 289                         if (ret)
 290                                 goto out_err;
 291                 }
 292
 293                 if (bo->mem.mem_type == TTM_PL_SYSTEM) {
 294
 295                         struct ttm_mem_reg *old_mem = &bo->mem;
 296                         uint32_t save_flags = old_mem->placement;
 297
 298                         *old_mem = *mem;
 299                         mem->mm_node = NULL;
 300                         ttm_flag_masked(&save_flags, mem->placement,
 301                                         TTM_PL_MASK_MEMTYPE);
 302                         goto moved;
 303                 }
 304
 305         }
 306
 307         if (!(old_man->flags & TTM_MEMTYPE_FLAG_FIXED) &&
 308             !(new_man->flags & TTM_MEMTYPE_FLAG_FIXED))
 309                 ret = ttm_bo_move_ttm(bo, evict, no_wait, mem);
 310         else if (bdev->driver->move)
 311                 ret = bdev->driver->move(bo, evict, interruptible,
 312                                          no_wait, mem);
 313         else
 314                 ret = ttm_bo_move_memcpy(bo, evict, no_wait, mem);
 315
 316         if (ret)
 317                 goto out_err;
 318
 319 moved:
 320         if (bo->evicted) {
 321                 ret = bdev->driver->invalidate_caches(bdev, bo->mem.placement);
 322                 if (ret)
 323                         printk(KERN_ERR TTM_PFX "Can not flush read caches\n");
 324                 bo->evicted = false;
 325         }
 326
 327         if (bo->mem.mm_node) {
 328                 spin_lock(&bo->lock);
 329                 bo->offset = (bo->mem.mm_node->start << PAGE_SHIFT) +
 330                     bdev->man[bo->mem.mem_type].gpu_offset;
 331                 bo->cur_placement = bo->mem.placement;
 332                 spin_unlock(&bo->lock);
 333         }
 334
 335         return 0;
 336
 337 out_err:
 338         new_man = &bdev->man[bo->mem.mem_type];
 339         if ((new_man->flags & TTM_MEMTYPE_FLAG_FIXED) && bo->ttm) {
 340                 ttm_tt_unbind(bo->ttm);
 341                 ttm_tt_destroy(bo->ttm);
 342                 bo->ttm = NULL;
 343         }
 344
 345         return ret;
 346 }
 347
 348 /**
 349  * If bo idle, remove from delayed- and lru lists, and unref.
 350  * If not idle, and already on delayed list, do nothing.
 351  * If not idle, and not on delayed list, put on delayed list,
 352  *   up the list_kref and schedule a delayed list check.
 353  */
 354
 355 static int ttm_bo_cleanup_refs(struct ttm_buffer_object *bo, bool remove_all)
 356 {
 357         struct ttm_bo_device *bdev = bo->bdev;
 358         struct ttm_bo_driver *driver = bdev->driver;
 359         int ret;
 360
 361         spin_lock(&bo->lock);
 362         (void) ttm_bo_wait(bo, false, false, !remove_all);
 363
 364         if (!bo->sync_obj) {
 365                 int put_count;
 366
 367                 spin_unlock(&bo->lock);
 368
 369                 spin_lock(&bdev->lru_lock);
 370                 ret = ttm_bo_reserve_locked(bo, false, false, false, 0);
 371                 BUG_ON(ret);
 372                 if (bo->ttm)
 373                         ttm_tt_unbind(bo->ttm);
 374
 375                 if (!list_empty(&bo->ddestroy)) {
 376                         list_del_init(&bo->ddestroy);
 377                         kref_put(&bo->list_kref, ttm_bo_ref_bug);
 378                 }
 379                 if (bo->mem.mm_node) {
 380                         drm_mm_put_block(bo->mem.mm_node);
 381                         bo->mem.mm_node = NULL;
 382                 }
 383                 put_count = ttm_bo_del_from_lru(bo);
 384                 spin_unlock(&bdev->lru_lock);
 385
 386                 atomic_set(&bo->reserved, 0);
 387
 388                 while (put_count--)
 389                         kref_put(&bo->list_kref, ttm_bo_release_list);
 390
 391                 return 0;
 392         }
 393
 394         spin_lock(&bdev->lru_lock);
 395         if (list_empty(&bo->ddestroy)) {
 396                 void *sync_obj = bo->sync_obj;
 397                 void *sync_obj_arg = bo->sync_obj_arg;
 398
 399                 kref_get(&bo->list_kref);
 400                 list_add_tail(&bo->ddestroy, &bdev->ddestroy);
 401                 spin_unlock(&bdev->lru_lock);
 402                 spin_unlock(&bo->lock);
 403
 404                 if (sync_obj)
 405                         driver->sync_obj_flush(sync_obj, sync_obj_arg);
 406                 schedule_delayed_work(&bdev->wq,
 407                                       ((HZ / 100) < 1) ? 1 : HZ / 100);
 408                 ret = 0;
 409
 410         } else {
 411                 spin_unlock(&bdev->lru_lock);
 412                 spin_unlock(&bo->lock);
 413                 ret = -EBUSY;
 414         }
 415
 416         return ret;
 417 }
 418
 419 /**
 420  * Traverse the delayed list, and call ttm_bo_cleanup_refs on all
 421  * encountered buffers.
 422  */
 423
 424 static int ttm_bo_delayed_delete(struct ttm_bo_device *bdev, bool remove_all)
 425 {
 426         struct ttm_buffer_object *entry, *nentry;
 427         struct list_head *list, *next;
 428         int ret;
 429
 430         spin_lock(&bdev->lru_lock);
 431         list_for_each_safe(list, next, &bdev->ddestroy) {
 432                 entry = list_entry(list, struct ttm_buffer_object, ddestroy);
 433                 nentry = NULL;
 434
 435                 /*
 436                  * Protect the next list entry from destruction while we
 437                  * unlock the lru_lock.
 438                  */
 439
 440                 if (next != &bdev->ddestroy) {
 441                         nentry = list_entry(next, struct ttm_buffer_object,
 442                                             ddestroy);
 443                         kref_get(&nentry->list_kref);
 444                 }
 445                 kref_get(&entry->list_kref);
 446
 447                 spin_unlock(&bdev->lru_lock);
 448                 ret = ttm_bo_cleanup_refs(entry, remove_all);
 449                 kref_put(&entry->list_kref, ttm_bo_release_list);
 450
 451                 spin_lock(&bdev->lru_lock);
 452                 if (nentry) {
 453                         bool next_onlist = !list_empty(next);
 454                         spin_unlock(&bdev->lru_lock);
 455                         kref_put(&nentry->list_kref, ttm_bo_release_list);
 456                         spin_lock(&bdev->lru_lock);
 457                         /*
 458                          * Someone might have raced us and removed the
 459                          * next entry from the list. We don't bother restarting
 460                          * list traversal.
 461                          */
 462
 463                         if (!next_onlist)
 464                                 break;
 465                 }
 466                 if (ret)
 467                         break;
 468         }
 469         ret = !list_empty(&bdev->ddestroy);
 470         spin_unlock(&bdev->lru_lock);
 471
 472         return ret;
 473 }
 474
 475 static void ttm_bo_delayed_workqueue(struct work_struct *work)
 476 {
 477         struct ttm_bo_device *bdev =
 478             container_of(work, struct ttm_bo_device, wq.work);
 479
 480         if (ttm_bo_delayed_delete(bdev, false)) {
 481                 schedule_delayed_work(&bdev->wq,
 482                                       ((HZ / 100) < 1) ? 1 : HZ / 100);
 483         }
 484 }
 485
 486 static void ttm_bo_release(struct kref *kref)
 487 {
 488         struct ttm_buffer_object *bo =
 489             container_of(kref, struct ttm_buffer_object, kref);
 490         struct ttm_bo_device *bdev = bo->bdev;
 491
 492         if (likely(bo->vm_node != NULL)) {
 493                 rb_erase(&bo->vm_rb, &bdev->addr_space_rb);
 494                 drm_mm_put_block(bo->vm_node);
 495                 bo->vm_node = NULL;
 496         }
 497         write_unlock(&bdev->vm_lock);
 498         ttm_bo_cleanup_refs(bo, false);
 499         kref_put(&bo->list_kref, ttm_bo_release_list);
 500         write_lock(&bdev->vm_lock);
 501 }
 502
 503 void ttm_bo_unref(struct ttm_buffer_object **p_bo)
 504 {
 505         struct ttm_buffer_object *bo = *p_bo;
 506         struct ttm_bo_device *bdev = bo->bdev;
 507
 508         *p_bo = NULL;
 509         write_lock(&bdev->vm_lock);
 510         kref_put(&bo->kref, ttm_bo_release);
 511         write_unlock(&bdev->vm_lock);
 512 }
 513 EXPORT_SYMBOL(ttm_bo_unref);
 514
 515 static int ttm_bo_evict(struct ttm_buffer_object *bo, unsigned mem_type,
 516                         bool interruptible, bool no_wait)
 517 {
 518         int ret = 0;
 519         struct ttm_bo_device *bdev = bo->bdev;
 520         struct ttm_mem_reg evict_mem;
 521         uint32_t proposed_placement;
 522
 523         if (bo->mem.mem_type != mem_type)
 524                 goto out;
 525
 526         spin_lock(&bo->lock);
 527         ret = ttm_bo_wait(bo, false, interruptible, no_wait);
 528         spin_unlock(&bo->lock);
 529
 530         if (unlikely(ret != 0)) {
 531                 if (ret != -ERESTART) {
 532                         printk(KERN_ERR TTM_PFX
 533                                "Failed to expire sync object before "
 534                                "buffer eviction.\n");
 535                 }
 536                 goto out;
 537         }
 538
 539         BUG_ON(!atomic_read(&bo->reserved));
 540
 541         evict_mem = bo->mem;
 542         evict_mem.mm_node = NULL;
 543
 544         proposed_placement = bdev->driver->evict_flags(bo);
 545
 546         ret = ttm_bo_mem_space(bo, proposed_placement,
 547                                &evict_mem, interruptible, no_wait);
 548         if (unlikely(ret != 0 && ret != -ERESTART))
 549                 ret = ttm_bo_mem_space(bo, TTM_PL_FLAG_SYSTEM,
 550                                        &evict_mem, interruptible, no_wait);
 551
 552         if (ret) {
 553                 if (ret != -ERESTART)
 554                         printk(KERN_ERR TTM_PFX
 555                                "Failed to find memory space for "
 556                                "buffer 0x%p eviction.\n", bo);
 557                 goto out;
 558         }
 559
 560         ret = ttm_bo_handle_move_mem(bo, &evict_mem, true, interruptible,
 561                                      no_wait);
 562         if (ret) {
 563                 if (ret != -ERESTART)
 564                         printk(KERN_ERR TTM_PFX "Buffer eviction failed\n");
 565                 goto out;
 566         }
 567
 568         spin_lock(&bdev->lru_lock);
 569         if (evict_mem.mm_node) {
 570                 drm_mm_put_block(evict_mem.mm_node);
 571                 evict_mem.mm_node = NULL;
 572         }
 573         spin_unlock(&bdev->lru_lock);
 574         bo->evicted = true;
 575 out:
 576         return ret;
 577 }
 578
 579 /**
 580  * Repeatedly evict memory from the LRU for @mem_type until we create enough
 581  * space, or we've evicted everything and there isn't enough space.
 582  */
 583 static int ttm_bo_mem_force_space(struct ttm_bo_device *bdev,
 584                                   struct ttm_mem_reg *mem,
 585                                   uint32_t mem_type,
 586                                   bool interruptible, bool no_wait)
 587 {
 588         struct drm_mm_node *node;
 589         struct ttm_buffer_object *entry;
 590         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
 591         struct list_head *lru;
 592         unsigned long num_pages = mem->num_pages;
 593         int put_count = 0;
 594         int ret;
 595
 596 retry_pre_get:
 597         ret = drm_mm_pre_get(&man->manager);
 598         if (unlikely(ret != 0))
 599                 return ret;
 600
 601         spin_lock(&bdev->lru_lock);
 602         do {
 603                 node = drm_mm_search_free(&man->manager, num_pages,
 604                                           mem->page_alignment, 1);
 605                 if (node)
 606                         break;
 607
 608                 lru = &man->lru;
 609                 if (list_empty(lru))
 610                         break;
 611
 612                 entry = list_first_entry(lru, struct ttm_buffer_object, lru);
 613                 kref_get(&entry->list_kref);
 614
 615                 ret =
 616                     ttm_bo_reserve_locked(entry, interruptible, no_wait,
 617                                           false, 0);
 618
 619                 if (likely(ret == 0))
 620                         put_count = ttm_bo_del_from_lru(entry);
 621
 622                 spin_unlock(&bdev->lru_lock);
 623
 624                 if (unlikely(ret != 0))
 625                         return ret;
 626
 627                 while (put_count--)
 628                         kref_put(&entry->list_kref, ttm_bo_ref_bug);
 629
 630                 ret = ttm_bo_evict(entry, mem_type, interruptible, no_wait);
 631
 632                 ttm_bo_unreserve(entry);
 633
 634                 kref_put(&entry->list_kref, ttm_bo_release_list);
 635                 if (ret)
 636                         return ret;
 637
 638                 spin_lock(&bdev->lru_lock);
 639         } while (1);
 640
 641         if (!node) {
 642                 spin_unlock(&bdev->lru_lock);
 643                 return -ENOMEM;
 644         }
 645
 646         node = drm_mm_get_block_atomic(node, num_pages, mem->page_alignment);
 647         if (unlikely(!node)) {
 648                 spin_unlock(&bdev->lru_lock);
 649                 goto retry_pre_get;
 650         }
 651
 652         spin_unlock(&bdev->lru_lock);
 653         mem->mm_node = node;
 654         mem->mem_type = mem_type;
 655         return 0;
 656 }
 657
 658 static bool ttm_bo_mt_compatible(struct ttm_mem_type_manager *man,
 659                                  bool disallow_fixed,
 660                                  uint32_t mem_type,
 661                                  uint32_t mask, uint32_t *res_mask)
 662 {
 663         uint32_t cur_flags = ttm_bo_type_flags(mem_type);
 664
 665         if ((man->flags & TTM_MEMTYPE_FLAG_FIXED) && disallow_fixed)
 666                 return false;
 667
 668         if ((cur_flags & mask & TTM_PL_MASK_MEM) == 0)
 669                 return false;
 670
 671         if ((mask & man->available_caching) == 0)
 672                 return false;
 673         if (mask & man->default_caching)
 674                 cur_flags |= man->default_caching;
 675         else if (mask & TTM_PL_FLAG_CACHED)
 676                 cur_flags |= TTM_PL_FLAG_CACHED;
 677         else if (mask & TTM_PL_FLAG_WC)
 678                 cur_flags |= TTM_PL_FLAG_WC;
 679         else
 680                 cur_flags |= TTM_PL_FLAG_UNCACHED;
 681
 682         *res_mask = cur_flags;
 683         return true;
 684 }
 685
 686 /**
 687  * Creates space for memory region @mem according to its type.
 688  *
 689  * This function first searches for free space in compatible memory types in
 690  * the priority order defined by the driver.  If free space isn't found, then
 691  * ttm_bo_mem_force_space is attempted in priority order to evict and find
 692  * space.
 693  */
 694 int ttm_bo_mem_space(struct ttm_buffer_object *bo,
 695                      uint32_t proposed_placement,
 696                      struct ttm_mem_reg *mem,
 697                      bool interruptible, bool no_wait)
 698 {
 699         struct ttm_bo_device *bdev = bo->bdev;
 700         struct ttm_mem_type_manager *man;
 701
 702         uint32_t num_prios = bdev->driver->num_mem_type_prio;
 703         const uint32_t *prios = bdev->driver->mem_type_prio;
 704         uint32_t i;
 705         uint32_t mem_type = TTM_PL_SYSTEM;
 706         uint32_t cur_flags = 0;
 707         bool type_found = false;
 708         bool type_ok = false;
 709         bool has_eagain = false;
 710         struct drm_mm_node *node = NULL;
 711         int ret;
 712
 713         mem->mm_node = NULL;
 714         for (i = 0; i < num_prios; ++i) {
 715                 mem_type = prios[i];
 716                 man = &bdev->man[mem_type];
 717
 718                 type_ok = ttm_bo_mt_compatible(man,
 719                                                bo->type == ttm_bo_type_user,
 720                                                mem_type, proposed_placement,
 721                                                &cur_flags);
 722
 723                 if (!type_ok)
 724                         continue;
 725
 726                 if (mem_type == TTM_PL_SYSTEM)
 727                         break;
 728
 729                 if (man->has_type && man->use_type) {
 730                         type_found = true;
 731                         do {
 732                                 ret = drm_mm_pre_get(&man->manager);
 733                                 if (unlikely(ret))
 734                                         return ret;
 735
 736                                 spin_lock(&bdev->lru_lock);
 737                                 node = drm_mm_search_free(&man->manager,
 738                                                           mem->num_pages,
 739                                                           mem->page_alignment,
 740                                                           1);
 741                                 if (unlikely(!node)) {
 742                                         spin_unlock(&bdev->lru_lock);
 743                                         break;
 744                                 }
 745                                 node = drm_mm_get_block_atomic(node,
 746                                                                mem->num_pages,
 747                                                                mem->
 748                                                                page_alignment);
 749                                 spin_unlock(&bdev->lru_lock);
 750                         } while (!node);
 751                 }
 752                 if (node)
 753                         break;
 754         }
 755
 756         if ((type_ok && (mem_type == TTM_PL_SYSTEM)) || node) {
 757                 mem->mm_node = node;
 758                 mem->mem_type = mem_type;
 759                 mem->placement = cur_flags;
 760                 return 0;
 761         }
 762
 763         if (!type_found)
 764                 return -EINVAL;
 765
 766         num_prios = bdev->driver->num_mem_busy_prio;
 767         prios = bdev->driver->mem_busy_prio;
 768
 769         for (i = 0; i < num_prios; ++i) {
 770                 mem_type = prios[i];
 771                 man = &bdev->man[mem_type];
 772
 773                 if (!man->has_type)
 774                         continue;
 775
 776                 if (!ttm_bo_mt_compatible(man,
 777                                           bo->type == ttm_bo_type_user,
 778                                           mem_type,
 779                                           proposed_placement, &cur_flags))
 780                         continue;
 781
 782                 ret = ttm_bo_mem_force_space(bdev, mem, mem_type,
 783                                              interruptible, no_wait);
 784
 785                 if (ret == 0 && mem->mm_node) {
 786                         mem->placement = cur_flags;
 787                         return 0;
 788                 }
 789
 790                 if (ret == -ERESTART)
 791                         has_eagain = true;
 792         }
 793
 794         ret = (has_eagain) ? -ERESTART : -ENOMEM;
 795         return ret;
 796 }
 797 EXPORT_SYMBOL(ttm_bo_mem_space);
 798
 799 int ttm_bo_wait_cpu(struct ttm_buffer_object *bo, bool no_wait)
 800 {
 801         int ret = 0;
 802
 803         if ((atomic_read(&bo->cpu_writers) > 0) && no_wait)
 804                 return -EBUSY;
 805
 806         ret = wait_event_interruptible(bo->event_queue,
 807                                        atomic_read(&bo->cpu_writers) == 0);
 808
 809         if (ret == -ERESTARTSYS)
 810                 ret = -ERESTART;
 811
 812         return ret;
 813 }
 814
 815 int ttm_bo_move_buffer(struct ttm_buffer_object *bo,
 816                        uint32_t proposed_placement,
 817                        bool interruptible, bool no_wait)
 818 {
 819         struct ttm_bo_device *bdev = bo->bdev;
 820         int ret = 0;
 821         struct ttm_mem_reg mem;
 822
 823         BUG_ON(!atomic_read(&bo->reserved));
 824
 825         /*
 826          * FIXME: It's possible to pipeline buffer moves.
 827          * Have the driver move function wait for idle when necessary,
 828          * instead of doing it here.
 829          */
 830
 831         spin_lock(&bo->lock);
 832         ret = ttm_bo_wait(bo, false, interruptible, no_wait);
 833         spin_unlock(&bo->lock);
 834
 835         if (ret)
 836                 return ret;
 837
 838         mem.num_pages = bo->num_pages;
 839         mem.size = mem.num_pages << PAGE_SHIFT;
 840         mem.page_alignment = bo->mem.page_alignment;
 841
 842         /*
 843          * Determine where to move the buffer.
 844          */
 845
 846         ret = ttm_bo_mem_space(bo, proposed_placement, &mem,
 847                                interruptible, no_wait);
 848         if (ret)
 849                 goto out_unlock;
 850
 851         ret = ttm_bo_handle_move_mem(bo, &mem, false, interruptible, no_wait);
 852
 853 out_unlock:
 854         if (ret && mem.mm_node) {
 855                 spin_lock(&bdev->lru_lock);
 856                 drm_mm_put_block(mem.mm_node);
 857                 spin_unlock(&bdev->lru_lock);
 858         }
 859         return ret;
 860 }
 861
 862 static int ttm_bo_mem_compat(uint32_t proposed_placement,
 863                              struct ttm_mem_reg *mem)
 864 {
 865         if ((proposed_placement & mem->placement & TTM_PL_MASK_MEM) == 0)
 866                 return 0;
 867         if ((proposed_placement & mem->placement & TTM_PL_MASK_CACHING) == 0)
 868                 return 0;
 869
 870         return 1;
 871 }
 872
 873 int ttm_buffer_object_validate(struct ttm_buffer_object *bo,
 874                                uint32_t proposed_placement,
 875                                bool interruptible, bool no_wait)
 876 {
 877         int ret;
 878
 879         BUG_ON(!atomic_read(&bo->reserved));
 880         bo->proposed_placement = proposed_placement;
 881
 882         TTM_DEBUG("Proposed placement 0x%08lx, Old flags 0x%08lx\n",
 883                   (unsigned long)proposed_placement,
 884                   (unsigned long)bo->mem.placement);
 885
 886         /*
 887          * Check whether we need to move buffer.
 888          */
 889
 890         if (!ttm_bo_mem_compat(bo->proposed_placement, &bo->mem)) {
 891                 ret = ttm_bo_move_buffer(bo, bo->proposed_placement,
 892                                          interruptible, no_wait);
 893                 if (ret) {
 894                         if (ret != -ERESTART)
 895                                 printk(KERN_ERR TTM_PFX
 896                                        "Failed moving buffer. "
 897                                        "Proposed placement 0x%08x\n",
 898                                        bo->proposed_placement);
 899                         if (ret == -ENOMEM)
 900                                 printk(KERN_ERR TTM_PFX
 901                                        "Out of aperture space or "
 902                                        "DRM memory quota.\n");
 903                         return ret;
 904                 }
 905         }
 906
 907         /*
 908          * We might need to add a TTM.
 909          */
 910
 911         if (bo->mem.mem_type == TTM_PL_SYSTEM && bo->ttm == NULL) {
 912                 ret = ttm_bo_add_ttm(bo, true);
 913                 if (ret)
 914                         return ret;
 915         }
 916         /*
 917          * Validation has succeeded, move the access and other
 918          * non-mapping-related flag bits from the proposed flags to
 919          * the active flags
 920          */
 921
 922         ttm_flag_masked(&bo->mem.placement, bo->proposed_placement,
 923                         ~TTM_PL_MASK_MEMTYPE);
 924
 925         return 0;
 926 }
 927 EXPORT_SYMBOL(ttm_buffer_object_validate);
 928
 929 int
 930 ttm_bo_check_placement(struct ttm_buffer_object *bo,
 931                        uint32_t set_flags, uint32_t clr_flags)
 932 {
 933         uint32_t new_mask = set_flags | clr_flags;
 934
 935         if ((bo->type == ttm_bo_type_user) &&
 936             (clr_flags & TTM_PL_FLAG_CACHED)) {
 937                 printk(KERN_ERR TTM_PFX
 938                        "User buffers require cache-coherent memory.\n");
 939                 return -EINVAL;
 940         }
 941
 942         if (!capable(CAP_SYS_ADMIN)) {
 943                 if (new_mask & TTM_PL_FLAG_NO_EVICT) {
 944                         printk(KERN_ERR TTM_PFX "Need to be root to modify"
 945                                " NO_EVICT status.\n");
 946                         return -EINVAL;
 947                 }
 948
 949                 if ((clr_flags & bo->mem.placement & TTM_PL_MASK_MEMTYPE) &&
 950                     (bo->mem.placement & TTM_PL_FLAG_NO_EVICT)) {
 951                         printk(KERN_ERR TTM_PFX
 952                                "Incompatible memory specification"
 953                                " for NO_EVICT buffer.\n");
 954                         return -EINVAL;
 955                 }
 956         }
 957         return 0;
 958 }
 959
 960 int ttm_buffer_object_init(struct ttm_bo_device *bdev,
 961                            struct ttm_buffer_object *bo,
 962                            unsigned long size,
 963                            enum ttm_bo_type type,
 964                            uint32_t flags,
 965                            uint32_t page_alignment,
 966                            unsigned long buffer_start,
 967                            bool interruptible,
 968                            struct file *persistant_swap_storage,
 969                            size_t acc_size,
 970                            void (*destroy) (struct ttm_buffer_object *))
 971 {
 972         int ret = 0;
 973         unsigned long num_pages;
 974
 975         size += buffer_start & ~PAGE_MASK;
 976         num_pages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
 977         if (num_pages == 0) {
 978                 printk(KERN_ERR TTM_PFX "Illegal buffer object size.\n");
 979                 return -EINVAL;
 980         }
 981         bo->destroy = destroy;
 982
 983         spin_lock_init(&bo->lock);
 984         kref_init(&bo->kref);
 985         kref_init(&bo->list_kref);
 986         atomic_set(&bo->cpu_writers, 0);
 987         atomic_set(&bo->reserved, 1);
 988         init_waitqueue_head(&bo->event_queue);
 989         INIT_LIST_HEAD(&bo->lru);
 990         INIT_LIST_HEAD(&bo->ddestroy);
 991         INIT_LIST_HEAD(&bo->swap);
 992         bo->bdev = bdev;
 993         bo->type = type;
 994         bo->num_pages = num_pages;
 995         bo->mem.mem_type = TTM_PL_SYSTEM;
 996         bo->mem.num_pages = bo->num_pages;
 997         bo->mem.mm_node = NULL;
 998         bo->mem.page_alignment = page_alignment;
 999         bo->buffer_start = buffer_start & PAGE_MASK;
1000         bo->priv_flags = 0;
1001         bo->mem.placement = (TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED);
1002         bo->seq_valid = false;
1003         bo->persistant_swap_storage = persistant_swap_storage;
1004         bo->acc_size = acc_size;
1005
1006         ret = ttm_bo_check_placement(bo, flags, 0ULL);
1007         if (unlikely(ret != 0))
1008                 goto out_err;
1009
1010         /*
1011          * If no caching attributes are set, accept any form of caching.
1012          */
1013
1014         if ((flags & TTM_PL_MASK_CACHING) == 0)
1015                 flags |= TTM_PL_MASK_CACHING;
1016
1017         /*
1018          * For ttm_bo_type_device buffers, allocate
1019          * address space from the device.
1020          */
1021
1022         if (bo->type == ttm_bo_type_device) {
1023                 ret = ttm_bo_setup_vm(bo);
1024                 if (ret)
1025                         goto out_err;
1026         }
1027
1028         ret = ttm_buffer_object_validate(bo, flags, interruptible, false);
1029         if (ret)
1030                 goto out_err;
1031
1032         ttm_bo_unreserve(bo);
1033         return 0;
1034
1035 out_err:
1036         ttm_bo_unreserve(bo);
1037         ttm_bo_unref(&bo);
1038
1039         return ret;
1040 }
1041 EXPORT_SYMBOL(ttm_buffer_object_init);
1042
1043 static inline size_t ttm_bo_size(struct ttm_bo_device *bdev,
1044                                  unsigned long num_pages)
1045 {
1046         size_t page_array_size = (num_pages * sizeof(void *) + PAGE_SIZE - 1) &
1047             PAGE_MASK;
1048
1049         return bdev->ttm_bo_size + 2 * page_array_size;
1050 }
1051
1052 int ttm_buffer_object_create(struct ttm_bo_device *bdev,
1053                              unsigned long size,
1054                              enum ttm_bo_type type,
1055                              uint32_t flags,
1056                              uint32_t page_alignment,
1057                              unsigned long buffer_start,
1058                              bool interruptible,
1059                              struct file *persistant_swap_storage,
1060                              struct ttm_buffer_object **p_bo)
1061 {
1062         struct ttm_buffer_object *bo;
1063         int ret;
1064         struct ttm_mem_global *mem_glob = bdev->mem_glob;
1065
1066         size_t acc_size =
1067             ttm_bo_size(bdev, (size + PAGE_SIZE - 1) >> PAGE_SHIFT);
1068         ret = ttm_mem_global_alloc(mem_glob, acc_size, false, false, false);
1069         if (unlikely(ret != 0))
1070                 return ret;
1071
1072         bo = kzalloc(sizeof(*bo), GFP_KERNEL);
1073
1074         if (unlikely(bo == NULL)) {
1075                 ttm_mem_global_free(mem_glob, acc_size, false);
1076                 return -ENOMEM;
1077         }
1078
1079         ret = ttm_buffer_object_init(bdev, bo, size, type, flags,
1080                                      page_alignment, buffer_start,
1081                                      interruptible,
1082                                      persistant_swap_storage, acc_size, NULL);
1083         if (likely(ret == 0))
1084                 *p_bo = bo;
1085
1086         return ret;
1087 }
1088
1089 static int ttm_bo_leave_list(struct ttm_buffer_object *bo,
1090                              uint32_t mem_type, bool allow_errors)
1091 {
1092         int ret;
1093
1094         spin_lock(&bo->lock);
1095         ret = ttm_bo_wait(bo, false, false, false);
1096         spin_unlock(&bo->lock);
1097
1098         if (ret && allow_errors)
1099                 goto out;
1100
1101         if (bo->mem.mem_type == mem_type)
1102                 ret = ttm_bo_evict(bo, mem_type, false, false);
1103
1104         if (ret) {
1105                 if (allow_errors) {
1106                         goto out;
1107                 } else {
1108                         ret = 0;
1109                         printk(KERN_ERR TTM_PFX "Cleanup eviction failed\n");
1110                 }
1111         }
1112
1113 out:
1114         return ret;
1115 }
1116
1117 static int ttm_bo_force_list_clean(struct ttm_bo_device *bdev,
1118                                    struct list_head *head,
1119                                    unsigned mem_type, bool allow_errors)
1120 {
1121         struct ttm_buffer_object *entry;
1122         int ret;
1123         int put_count;
1124
1125         /*
1126          * Can't use standard list traversal since we're unlocking.
1127          */
1128
1129         spin_lock(&bdev->lru_lock);
1130
1131         while (!list_empty(head)) {
1132                 entry = list_first_entry(head, struct ttm_buffer_object, lru);
1133                 kref_get(&entry->list_kref);
1134                 ret = ttm_bo_reserve_locked(entry, false, false, false, 0);
1135                 put_count = ttm_bo_del_from_lru(entry);
1136                 spin_unlock(&bdev->lru_lock);
1137                 while (put_count--)
1138                         kref_put(&entry->list_kref, ttm_bo_ref_bug);
1139                 BUG_ON(ret);
1140                 ret = ttm_bo_leave_list(entry, mem_type, allow_errors);
1141                 ttm_bo_unreserve(entry);
1142                 kref_put(&entry->list_kref, ttm_bo_release_list);
1143                 spin_lock(&bdev->lru_lock);
1144         }
1145
1146         spin_unlock(&bdev->lru_lock);
1147
1148         return 0;
1149 }
1150
1151 int ttm_bo_clean_mm(struct ttm_bo_device *bdev, unsigned mem_type)
1152 {
1153         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
1154         int ret = -EINVAL;
1155
1156         if (mem_type >= TTM_NUM_MEM_TYPES) {
1157                 printk(KERN_ERR TTM_PFX "Illegal memory type %d\n", mem_type);
1158                 return ret;
1159         }
1160
1161         if (!man->has_type) {
1162                 printk(KERN_ERR TTM_PFX "Trying to take down uninitialized "
1163                        "memory manager type %u\n", mem_type);
1164                 return ret;
1165         }
1166
1167         man->use_type = false;
1168         man->has_type = false;
1169
1170         ret = 0;
1171         if (mem_type > 0) {
1172                 ttm_bo_force_list_clean(bdev, &man->lru, mem_type, false);
1173
1174                 spin_lock(&bdev->lru_lock);
1175                 if (drm_mm_clean(&man->manager))
1176                         drm_mm_takedown(&man->manager);
1177                 else
1178                         ret = -EBUSY;
1179
1180                 spin_unlock(&bdev->lru_lock);
1181         }
1182
1183         return ret;
1184 }
1185 EXPORT_SYMBOL(ttm_bo_clean_mm);
1186
1187 int ttm_bo_evict_mm(struct ttm_bo_device *bdev, unsigned mem_type)
1188 {
1189         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
1190
1191         if (mem_type == 0 || mem_type >= TTM_NUM_MEM_TYPES) {
1192                 printk(KERN_ERR TTM_PFX
1193                        "Illegal memory manager memory type %u.\n",
1194                        mem_type);
1195                 return -EINVAL;
1196         }
1197
1198         if (!man->has_type) {
1199                 printk(KERN_ERR TTM_PFX
1200                        "Memory type %u has not been initialized.\n",
1201                        mem_type);
1202                 return 0;
1203         }
1204
1205         return ttm_bo_force_list_clean(bdev, &man->lru, mem_type, true);
1206 }
1207 EXPORT_SYMBOL(ttm_bo_evict_mm);
1208
1209 int ttm_bo_init_mm(struct ttm_bo_device *bdev, unsigned type,
1210                    unsigned long p_offset, unsigned long p_size)
1211 {
1212         int ret = -EINVAL;
1213         struct ttm_mem_type_manager *man;
1214
1215         if (type >= TTM_NUM_MEM_TYPES) {
1216                 printk(KERN_ERR TTM_PFX "Illegal memory type %d\n", type);
1217                 return ret;
1218         }
1219
1220         man = &bdev->man[type];
1221         if (man->has_type) {
1222                 printk(KERN_ERR TTM_PFX
1223                        "Memory manager already initialized for type %d\n",
1224                        type);
1225                 return ret;
1226         }
1227
1228         ret = bdev->driver->init_mem_type(bdev, type, man);
1229         if (ret)
1230                 return ret;
1231
1232         ret = 0;
1233         if (type != TTM_PL_SYSTEM) {
1234                 if (!p_size) {
1235                         printk(KERN_ERR TTM_PFX
1236                                "Zero size memory manager type %d\n",
1237                                type);
1238                         return ret;
1239                 }
1240                 ret = drm_mm_init(&man->manager, p_offset, p_size);
1241                 if (ret)
1242                         return ret;
1243         }
1244         man->has_type = true;
1245         man->use_type = true;
1246         man->size = p_size;
1247
1248         INIT_LIST_HEAD(&man->lru);
1249
1250         return 0;
1251 }
1252 EXPORT_SYMBOL(ttm_bo_init_mm);
1253
1254 int ttm_bo_device_release(struct ttm_bo_device *bdev)
1255 {
1256         int ret = 0;
1257         unsigned i = TTM_NUM_MEM_TYPES;
1258         struct ttm_mem_type_manager *man;
1259
1260         while (i--) {
1261                 man = &bdev->man[i];
1262                 if (man->has_type) {
1263                         man->use_type = false;
1264                         if ((i != TTM_PL_SYSTEM) && ttm_bo_clean_mm(bdev, i)) {
1265                                 ret = -EBUSY;
1266                                 printk(KERN_ERR TTM_PFX
1267                                        "DRM memory manager type %d "
1268                                        "is not clean.\n", i);
1269                         }
1270                         man->has_type = false;
1271                 }
1272         }
1273
1274         if (!cancel_delayed_work(&bdev->wq))
1275                 flush_scheduled_work();
1276
1277         while (ttm_bo_delayed_delete(bdev, true))
1278                 ;
1279
1280         spin_lock(&bdev->lru_lock);
1281         if (list_empty(&bdev->ddestroy))
1282                 TTM_DEBUG("Delayed destroy list was clean\n");
1283
1284         if (list_empty(&bdev->man[0].lru))
1285                 TTM_DEBUG("Swap list was clean\n");
1286         spin_unlock(&bdev->lru_lock);
1287
1288         ttm_mem_unregister_shrink(bdev->mem_glob, &bdev->shrink);
1289         BUG_ON(!drm_mm_clean(&bdev->addr_space_mm));
1290         write_lock(&bdev->vm_lock);
1291         drm_mm_takedown(&bdev->addr_space_mm);
1292         write_unlock(&bdev->vm_lock);
1293
1294         __free_page(bdev->dummy_read_page);
1295         return ret;
1296 }
1297 EXPORT_SYMBOL(ttm_bo_device_release);
1298
1299 /*
1300  * This function is intended to be called on drm driver load.
1301  * If you decide to call it from firstopen, you must protect the call
1302  * from a potentially racing ttm_bo_driver_finish in lastclose.
1303  * (This may happen on X server restart).
1304  */
1305
1306 int ttm_bo_device_init(struct ttm_bo_device *bdev,
1307                        struct ttm_mem_global *mem_glob,
1308                        struct ttm_bo_driver *driver, uint64_t file_page_offset)
1309 {
1310         int ret = -EINVAL;
1311
1312         bdev->dummy_read_page = NULL;
1313         rwlock_init(&bdev->vm_lock);
1314         spin_lock_init(&bdev->lru_lock);
1315
1316         bdev->driver = driver;
1317         bdev->mem_glob = mem_glob;
1318
1319         memset(bdev->man, 0, sizeof(bdev->man));
1320
1321         bdev->dummy_read_page = alloc_page(__GFP_ZERO | GFP_DMA32);
1322         if (unlikely(bdev->dummy_read_page == NULL)) {
1323                 ret = -ENOMEM;
1324                 goto out_err0;
1325         }
1326
1327         /*
1328          * Initialize the system memory buffer type.
1329          * Other types need to be driver / IOCTL initialized.
1330          */
1331         ret = ttm_bo_init_mm(bdev, TTM_PL_SYSTEM, 0, 0);
1332         if (unlikely(ret != 0))
1333                 goto out_err1;
1334
1335         bdev->addr_space_rb = RB_ROOT;
1336         ret = drm_mm_init(&bdev->addr_space_mm, file_page_offset, 0x10000000);
1337         if (unlikely(ret != 0))
1338                 goto out_err2;
1339
1340         INIT_DELAYED_WORK(&bdev->wq, ttm_bo_delayed_workqueue);
1341         bdev->nice_mode = true;
1342         INIT_LIST_HEAD(&bdev->ddestroy);
1343         INIT_LIST_HEAD(&bdev->swap_lru);
1344         bdev->dev_mapping = NULL;
1345         ttm_mem_init_shrink(&bdev->shrink, ttm_bo_swapout);
1346         ret = ttm_mem_register_shrink(mem_glob, &bdev->shrink);
1347         if (unlikely(ret != 0)) {
1348                 printk(KERN_ERR TTM_PFX
1349                        "Could not register buffer object swapout.\n");
1350                 goto out_err2;
1351         }
1352
1353         bdev->ttm_bo_extra_size =
1354                 ttm_round_pot(sizeof(struct ttm_tt)) +
1355                 ttm_round_pot(sizeof(struct ttm_backend));
1356
1357         bdev->ttm_bo_size = bdev->ttm_bo_extra_size +
1358                 ttm_round_pot(sizeof(struct ttm_buffer_object));
1359
1360         return 0;
1361 out_err2:
1362         ttm_bo_clean_mm(bdev, 0);
1363 out_err1:
1364         __free_page(bdev->dummy_read_page);
1365 out_err0:
1366         return ret;
1367 }
1368 EXPORT_SYMBOL(ttm_bo_device_init);
1369
1370 /*
1371  * buffer object vm functions.
1372  */
1373
1374 bool ttm_mem_reg_is_pci(struct ttm_bo_device *bdev, struct ttm_mem_reg *mem)
1375 {
1376         struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
1377
1378         if (!(man->flags & TTM_MEMTYPE_FLAG_FIXED)) {
1379                 if (mem->mem_type == TTM_PL_SYSTEM)
1380                         return false;
1381
1382                 if (man->flags & TTM_MEMTYPE_FLAG_CMA)
1383                         return false;
1384
1385                 if (mem->placement & TTM_PL_FLAG_CACHED)
1386                         return false;
1387         }
1388         return true;
1389 }
1390
1391 int ttm_bo_pci_offset(struct ttm_bo_device *bdev,
1392                       struct ttm_mem_reg *mem,
1393                       unsigned long *bus_base,
1394                       unsigned long *bus_offset, unsigned long *bus_size)
1395 {
1396         struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
1397
1398         *bus_size = 0;
1399         if (!(man->flags & TTM_MEMTYPE_FLAG_MAPPABLE))
1400                 return -EINVAL;
1401
1402         if (ttm_mem_reg_is_pci(bdev, mem)) {
1403                 *bus_offset = mem->mm_node->start << PAGE_SHIFT;
1404                 *bus_size = mem->num_pages << PAGE_SHIFT;
1405                 *bus_base = man->io_offset;
1406         }
1407
1408         return 0;
1409 }
1410
1411 void ttm_bo_unmap_virtual(struct ttm_buffer_object *bo)
1412 {
1413         struct ttm_bo_device *bdev = bo->bdev;
1414         loff_t offset = (loff_t) bo->addr_space_offset;
1415         loff_t holelen = ((loff_t) bo->mem.num_pages) << PAGE_SHIFT;
1416
1417         if (!bdev->dev_mapping)
1418                 return;
1419
1420         unmap_mapping_range(bdev->dev_mapping, offset, holelen, 1);
1421 }
1422
1423 static void ttm_bo_vm_insert_rb(struct ttm_buffer_object *bo)
1424 {
1425         struct ttm_bo_device *bdev = bo->bdev;
1426         struct rb_node **cur = &bdev->addr_space_rb.rb_node;
1427         struct rb_node *parent = NULL;
1428         struct ttm_buffer_object *cur_bo;
1429         unsigned long offset = bo->vm_node->start;
1430         unsigned long cur_offset;
1431
1432         while (*cur) {
1433                 parent = *cur;
1434                 cur_bo = rb_entry(parent, struct ttm_buffer_object, vm_rb);
1435                 cur_offset = cur_bo->vm_node->start;
1436                 if (offset < cur_offset)
1437                         cur = &parent->rb_left;
1438                 else if (offset > cur_offset)
1439                         cur = &parent->rb_right;
1440                 else
1441                         BUG();
1442         }
1443
1444         rb_link_node(&bo->vm_rb, parent, cur);
1445         rb_insert_color(&bo->vm_rb, &bdev->addr_space_rb);
1446 }
1447
1448 /**
1449  * ttm_bo_setup_vm:
1450  *
1451  * @bo: the buffer to allocate address space for
1452  *
1453  * Allocate address space in the drm device so that applications
1454  * can mmap the buffer and access the contents. This only
1455  * applies to ttm_bo_type_device objects as others are not
1456  * placed in the drm device address space.
1457  */
1458
1459 static int ttm_bo_setup_vm(struct ttm_buffer_object *bo)
1460 {
1461         struct ttm_bo_device *bdev = bo->bdev;
1462         int ret;
1463
1464 retry_pre_get:
1465         ret = drm_mm_pre_get(&bdev->addr_space_mm);
1466         if (unlikely(ret != 0))
1467                 return ret;
1468
1469         write_lock(&bdev->vm_lock);
1470         bo->vm_node = drm_mm_search_free(&bdev->addr_space_mm,
1471                                          bo->mem.num_pages, 0, 0);
1472
1473         if (unlikely(bo->vm_node == NULL)) {
1474                 ret = -ENOMEM;
1475                 goto out_unlock;
1476         }
1477
1478         bo->vm_node = drm_mm_get_block_atomic(bo->vm_node,
1479                                               bo->mem.num_pages, 0);
1480
1481         if (unlikely(bo->vm_node == NULL)) {
1482                 write_unlock(&bdev->vm_lock);
1483                 goto retry_pre_get;
1484         }
1485
1486         ttm_bo_vm_insert_rb(bo);
1487         write_unlock(&bdev->vm_lock);
1488         bo->addr_space_offset = ((uint64_t) bo->vm_node->start) << PAGE_SHIFT;
1489
1490         return 0;
1491 out_unlock:
1492         write_unlock(&bdev->vm_lock);
1493         return ret;
1494 }
1495
1496 int ttm_bo_wait(struct ttm_buffer_object *bo,
1497                 bool lazy, bool interruptible, bool no_wait)
1498 {
1499         struct ttm_bo_driver *driver = bo->bdev->driver;
1500         void *sync_obj;
1501         void *sync_obj_arg;
1502         int ret = 0;
1503
1504         if (likely(bo->sync_obj == NULL))
1505                 return 0;
1506
1507         while (bo->sync_obj) {
1508
1509                 if (driver->sync_obj_signaled(bo->sync_obj, bo->sync_obj_arg)) {
1510                         void *tmp_obj = bo->sync_obj;
1511                         bo->sync_obj = NULL;
1512                         clear_bit(TTM_BO_PRIV_FLAG_MOVING, &bo->priv_flags);
1513                         spin_unlock(&bo->lock);
1514                         driver->sync_obj_unref(&tmp_obj);
1515                         spin_lock(&bo->lock);
1516                         continue;
1517                 }
1518
1519                 if (no_wait)
1520                         return -EBUSY;
1521
1522                 sync_obj = driver->sync_obj_ref(bo->sync_obj);
1523                 sync_obj_arg = bo->sync_obj_arg;
1524                 spin_unlock(&bo->lock);
1525                 ret = driver->sync_obj_wait(sync_obj, sync_obj_arg,
1526                                             lazy, interruptible);
1527                 if (unlikely(ret != 0)) {
1528                         driver->sync_obj_unref(&sync_obj);
1529                         spin_lock(&bo->lock);
1530                         return ret;
1531                 }
1532                 spin_lock(&bo->lock);
1533                 if (likely(bo->sync_obj == sync_obj &&
1534                            bo->sync_obj_arg == sync_obj_arg)) {
1535                         void *tmp_obj = bo->sync_obj;
1536                         bo->sync_obj = NULL;
1537                         clear_bit(TTM_BO_PRIV_FLAG_MOVING,
1538                                   &bo->priv_flags);
1539                         spin_unlock(&bo->lock);
1540                         driver->sync_obj_unref(&sync_obj);
1541                         driver->sync_obj_unref(&tmp_obj);
1542                         spin_lock(&bo->lock);
1543                 }
1544         }
1545         return 0;
1546 }
1547 EXPORT_SYMBOL(ttm_bo_wait);
1548
1549 void ttm_bo_unblock_reservation(struct ttm_buffer_object *bo)
1550 {
1551         atomic_set(&bo->reserved, 0);
1552         wake_up_all(&bo->event_queue);
1553 }
1554
1555 int ttm_bo_block_reservation(struct ttm_buffer_object *bo, bool interruptible,
1556                              bool no_wait)
1557 {
1558         int ret;
1559
1560         while (unlikely(atomic_cmpxchg(&bo->reserved, 0, 1) != 0)) {
1561                 if (no_wait)
1562                         return -EBUSY;
1563                 else if (interruptible) {
1564                         ret = wait_event_interruptible
1565                             (bo->event_queue, atomic_read(&bo->reserved) == 0);
1566                         if (unlikely(ret != 0))
1567                                 return -ERESTART;
1568                 } else {
1569                         wait_event(bo->event_queue,
1570                                    atomic_read(&bo->reserved) == 0);
1571                 }
1572         }
1573         return 0;
1574 }
1575
1576 int ttm_bo_synccpu_write_grab(struct ttm_buffer_object *bo, bool no_wait)
1577 {
1578         int ret = 0;
1579
1580         /*
1581          * Using ttm_bo_reserve instead of ttm_bo_block_reservation
1582          * makes sure the lru lists are updated.
1583          */
1584
1585         ret = ttm_bo_reserve(bo, true, no_wait, false, 0);
1586         if (unlikely(ret != 0))
1587                 return ret;
1588         spin_lock(&bo->lock);
1589         ret = ttm_bo_wait(bo, false, true, no_wait);
1590         spin_unlock(&bo->lock);
1591         if (likely(ret == 0))
1592                 atomic_inc(&bo->cpu_writers);
1593         ttm_bo_unreserve(bo);
1594         return ret;
1595 }
1596
1597 void ttm_bo_synccpu_write_release(struct ttm_buffer_object *bo)
1598 {
1599         if (atomic_dec_and_test(&bo->cpu_writers))
1600                 wake_up_all(&bo->event_queue);
1601 }
1602
1603 /**
1604  * A buffer object shrink method that tries to swap out the first
1605  * buffer object on the bo_global::swap_lru list.
1606  */
1607
1608 static int ttm_bo_swapout(struct ttm_mem_shrink *shrink)
1609 {
1610         struct ttm_bo_device *bdev =
1611             container_of(shrink, struct ttm_bo_device, shrink);
1612         struct ttm_buffer_object *bo;
1613         int ret = -EBUSY;
1614         int put_count;
1615         uint32_t swap_placement = (TTM_PL_FLAG_CACHED | TTM_PL_FLAG_SYSTEM);
1616
1617         spin_lock(&bdev->lru_lock);
1618         while (ret == -EBUSY) {
1619                 if (unlikely(list_empty(&bdev->swap_lru))) {
1620                         spin_unlock(&bdev->lru_lock);
1621                         return -EBUSY;
1622                 }
1623
1624                 bo = list_first_entry(&bdev->swap_lru,
1625                                       struct ttm_buffer_object, swap);
1626                 kref_get(&bo->list_kref);
1627
1628                 /**
1629                  * Reserve buffer. Since we unlock while sleeping, we need
1630                  * to re-check that nobody removed us from the swap-list while
1631                  * we slept.
1632                  */
1633
1634                 ret = ttm_bo_reserve_locked(bo, false, true, false, 0);
1635                 if (unlikely(ret == -EBUSY)) {
1636                         spin_unlock(&bdev->lru_lock);
1637                         ttm_bo_wait_unreserved(bo, false);
1638                         kref_put(&bo->list_kref, ttm_bo_release_list);
1639                         spin_lock(&bdev->lru_lock);
1640                 }
1641         }
1642
1643         BUG_ON(ret != 0);
1644         put_count = ttm_bo_del_from_lru(bo);
1645         spin_unlock(&bdev->lru_lock);
1646
1647         while (put_count--)
1648                 kref_put(&bo->list_kref, ttm_bo_ref_bug);
1649
1650         /**
1651          * Wait for GPU, then move to system cached.
1652          */
1653
1654         spin_lock(&bo->lock);
1655         ret = ttm_bo_wait(bo, false, false, false);
1656         spin_unlock(&bo->lock);
1657
1658         if (unlikely(ret != 0))
1659                 goto out;
1660
1661         if ((bo->mem.placement & swap_placement) != swap_placement) {
1662                 struct ttm_mem_reg evict_mem;
1663
1664                 evict_mem = bo->mem;
1665                 evict_mem.mm_node = NULL;
1666                 evict_mem.placement = TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED;
1667                 evict_mem.mem_type = TTM_PL_SYSTEM;
1668
1669                 ret = ttm_bo_handle_move_mem(bo, &evict_mem, true,
1670                                              false, false);
1671                 if (unlikely(ret != 0))
1672                         goto out;
1673         }
1674
1675         ttm_bo_unmap_virtual(bo);
1676
1677         /**
1678          * Swap out. Buffer will be swapped in again as soon as
1679          * anyone tries to access a ttm page.
1680          */
1681
1682         ret = ttm_tt_swapout(bo->ttm, bo->persistant_swap_storage);
1683 out:
1684
1685         /**
1686          *
1687          * Unreserve without putting on LRU to avoid swapping out an
1688          * already swapped buffer.
1689          */
1690
1691         atomic_set(&bo->reserved, 0);
1692         wake_up_all(&bo->event_queue);
1693         kref_put(&bo->list_kref, ttm_bo_release_list);
1694         return ret;
1695 }
1696
1697 void ttm_bo_swapout_all(struct ttm_bo_device *bdev)
1698 {
1699         while (ttm_bo_swapout(&bdev->shrink) == 0)
1700                 ;
1701 }