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 #include <asm/atomic.h>
  41
  42 #define TTM_ASSERT_LOCKED(param)
  43 #define TTM_DEBUG(fmt, arg...)
  44 #define TTM_BO_HASH_ORDER 13
  45
  46 static int ttm_bo_setup_vm(struct ttm_buffer_object *bo);
  47 static int ttm_bo_swapout(struct ttm_mem_shrink *shrink);
  48 static void ttm_bo_global_kobj_release(struct kobject *kobj);
  49
  50 static struct attribute ttm_bo_count = {
  51         .name = "bo_count",
  52         .mode = S_IRUGO
  53 };
  54
  55 static inline int ttm_mem_type_from_flags(uint32_t flags, uint32_t *mem_type)
  56 {
  57         int i;
  58
  59         for (i = 0; i <= TTM_PL_PRIV5; i++)
  60                 if (flags & (1 << i)) {
  61                         *mem_type = i;
  62                         return 0;
  63                 }
  64         return -EINVAL;
  65 }
  66
  67 static void ttm_mem_type_debug(struct ttm_bo_device *bdev, int mem_type)
  68 {
  69         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
  70
  71         printk(KERN_ERR TTM_PFX "    has_type: %d\n", man->has_type);
  72         printk(KERN_ERR TTM_PFX "    use_type: %d\n", man->use_type);
  73         printk(KERN_ERR TTM_PFX "    flags: 0x%08X\n", man->flags);
  74         printk(KERN_ERR TTM_PFX "    gpu_offset: 0x%08lX\n", man->gpu_offset);
  75         printk(KERN_ERR TTM_PFX "    size: %llu\n", man->size);
  76         printk(KERN_ERR TTM_PFX "    available_caching: 0x%08X\n",
  77                 man->available_caching);
  78         printk(KERN_ERR TTM_PFX "    default_caching: 0x%08X\n",
  79                 man->default_caching);
  80         if (mem_type != TTM_PL_SYSTEM)
  81                 (*man->func->debug)(man, TTM_PFX);
  82 }
  83
  84 static void ttm_bo_mem_space_debug(struct ttm_buffer_object *bo,
  85                                         struct ttm_placement *placement)
  86 {
  87         int i, ret, mem_type;
  88
  89         printk(KERN_ERR TTM_PFX "No space for %p (%lu pages, %luK, %luM)\n",
  90                 bo, bo->mem.num_pages, bo->mem.size >> 10,
  91                 bo->mem.size >> 20);
  92         for (i = 0; i < placement->num_placement; i++) {
  93                 ret = ttm_mem_type_from_flags(placement->placement[i],
  94                                                 &mem_type);
  95                 if (ret)
  96                         return;
  97                 printk(KERN_ERR TTM_PFX "  placement[%d]=0x%08X (%d)\n",
  98                         i, placement->placement[i], mem_type);
  99                 ttm_mem_type_debug(bo->bdev, mem_type);
 100         }
 101 }
 102
 103 static ssize_t ttm_bo_global_show(struct kobject *kobj,
 104                                   struct attribute *attr,
 105                                   char *buffer)
 106 {
 107         struct ttm_bo_global *glob =
 108                 container_of(kobj, struct ttm_bo_global, kobj);
 109
 110         return snprintf(buffer, PAGE_SIZE, "%lu\n",
 111                         (unsigned long) atomic_read(&glob->bo_count));
 112 }
 113
 114 static struct attribute *ttm_bo_global_attrs[] = {
 115         &ttm_bo_count,
 116         NULL
 117 };
 118
 119 static const struct sysfs_ops ttm_bo_global_ops = {
 120         .show = &ttm_bo_global_show
 121 };
 122
 123 static struct kobj_type ttm_bo_glob_kobj_type  = {
 124         .release = &ttm_bo_global_kobj_release,
 125         .sysfs_ops = &ttm_bo_global_ops,
 126         .default_attrs = ttm_bo_global_attrs
 127 };
 128
 129
 130 static inline uint32_t ttm_bo_type_flags(unsigned type)
 131 {
 132         return 1 << (type);
 133 }
 134
 135 static void ttm_bo_release_list(struct kref *list_kref)
 136 {
 137         struct ttm_buffer_object *bo =
 138             container_of(list_kref, struct ttm_buffer_object, list_kref);
 139         struct ttm_bo_device *bdev = bo->bdev;
 140
 141         BUG_ON(atomic_read(&bo->list_kref.refcount));
 142         BUG_ON(atomic_read(&bo->kref.refcount));
 143         BUG_ON(atomic_read(&bo->cpu_writers));
 144         BUG_ON(bo->sync_obj != NULL);
 145         BUG_ON(bo->mem.mm_node != NULL);
 146         BUG_ON(!list_empty(&bo->lru));
 147         BUG_ON(!list_empty(&bo->ddestroy));
 148
 149         if (bo->ttm)
 150                 ttm_tt_destroy(bo->ttm);
 151         atomic_dec(&bo->glob->bo_count);
 152         if (bo->destroy)
 153                 bo->destroy(bo);
 154         else {
 155                 ttm_mem_global_free(bdev->glob->mem_glob, bo->acc_size);
 156                 kfree(bo);
 157         }
 158 }
 159
 160 int ttm_bo_wait_unreserved(struct ttm_buffer_object *bo, bool interruptible)
 161 {
 162         if (interruptible) {
 163                 return wait_event_interruptible(bo->event_queue,
 164                                                atomic_read(&bo->reserved) == 0);
 165         } else {
 166                 wait_event(bo->event_queue, atomic_read(&bo->reserved) == 0);
 167                 return 0;
 168         }
 169 }
 170 EXPORT_SYMBOL(ttm_bo_wait_unreserved);
 171
 172 void ttm_bo_add_to_lru(struct ttm_buffer_object *bo)
 173 {
 174         struct ttm_bo_device *bdev = bo->bdev;
 175         struct ttm_mem_type_manager *man;
 176
 177         BUG_ON(!atomic_read(&bo->reserved));
 178
 179         if (!(bo->mem.placement & TTM_PL_FLAG_NO_EVICT)) {
 180
 181                 BUG_ON(!list_empty(&bo->lru));
 182
 183                 man = &bdev->man[bo->mem.mem_type];
 184                 list_add_tail(&bo->lru, &man->lru);
 185                 kref_get(&bo->list_kref);
 186
 187                 if (bo->ttm != NULL) {
 188                         list_add_tail(&bo->swap, &bo->glob->swap_lru);
 189                         kref_get(&bo->list_kref);
 190                 }
 191         }
 192 }
 193
 194 int ttm_bo_del_from_lru(struct ttm_buffer_object *bo)
 195 {
 196         int put_count = 0;
 197
 198         if (!list_empty(&bo->swap)) {
 199                 list_del_init(&bo->swap);
 200                 ++put_count;
 201         }
 202         if (!list_empty(&bo->lru)) {
 203                 list_del_init(&bo->lru);
 204                 ++put_count;
 205         }
 206
 207         /*
 208          * TODO: Add a driver hook to delete from
 209          * driver-specific LRU's here.
 210          */
 211
 212         return put_count;
 213 }
 214
 215 int ttm_bo_reserve_locked(struct ttm_buffer_object *bo,
 216                           bool interruptible,
 217                           bool no_wait, bool use_sequence, uint32_t sequence)
 218 {
 219         struct ttm_bo_global *glob = bo->glob;
 220         int ret;
 221
 222         while (unlikely(atomic_cmpxchg(&bo->reserved, 0, 1) != 0)) {
 223                 /**
 224                  * Deadlock avoidance for multi-bo reserving.
 225                  */
 226                 if (use_sequence && bo->seq_valid &&
 227                         (sequence - bo->val_seq < (1 << 31))) {
 228                         return -EAGAIN;
 229                 }
 230
 231                 if (no_wait)
 232                         return -EBUSY;
 233
 234                 spin_unlock(&glob->lru_lock);
 235                 ret = ttm_bo_wait_unreserved(bo, interruptible);
 236                 spin_lock(&glob->lru_lock);
 237
 238                 if (unlikely(ret))
 239                         return ret;
 240         }
 241
 242         if (use_sequence) {
 243                 /**
 244                  * Wake up waiters that may need to recheck for deadlock,
 245                  * if we decreased the sequence number.
 246                  */
 247                 if (unlikely((bo->val_seq - sequence < (1 << 31))
 248                              || !bo->seq_valid))
 249                         wake_up_all(&bo->event_queue);
 250
 251                 bo->val_seq = sequence;
 252                 bo->seq_valid = true;
 253         } else {
 254                 bo->seq_valid = false;
 255         }
 256
 257         return 0;
 258 }
 259 EXPORT_SYMBOL(ttm_bo_reserve);
 260
 261 static void ttm_bo_ref_bug(struct kref *list_kref)
 262 {
 263         BUG();
 264 }
 265
 266 void ttm_bo_list_ref_sub(struct ttm_buffer_object *bo, int count,
 267                          bool never_free)
 268 {
 269         while (count--)
 270                 kref_put(&bo->list_kref,
 271                          (never_free || (count >= 0)) ? ttm_bo_ref_bug :
 272                          ttm_bo_release_list);
 273 }
 274
 275 int ttm_bo_reserve(struct ttm_buffer_object *bo,
 276                    bool interruptible,
 277                    bool no_wait, bool use_sequence, uint32_t sequence)
 278 {
 279         struct ttm_bo_global *glob = bo->glob;
 280         int put_count = 0;
 281         int ret;
 282
 283         spin_lock(&glob->lru_lock);
 284         ret = ttm_bo_reserve_locked(bo, interruptible, no_wait, use_sequence,
 285                                     sequence);
 286         if (likely(ret == 0))
 287                 put_count = ttm_bo_del_from_lru(bo);
 288         spin_unlock(&glob->lru_lock);
 289
 290         ttm_bo_list_ref_sub(bo, put_count, true);
 291
 292         return ret;
 293 }
 294
 295 void ttm_bo_unreserve(struct ttm_buffer_object *bo)
 296 {
 297         struct ttm_bo_global *glob = bo->glob;
 298
 299         spin_lock(&glob->lru_lock);
 300         ttm_bo_add_to_lru(bo);
 301         atomic_set(&bo->reserved, 0);
 302         wake_up_all(&bo->event_queue);
 303         spin_unlock(&glob->lru_lock);
 304 }
 305 EXPORT_SYMBOL(ttm_bo_unreserve);
 306
 307 /*
 308  * Call bo->mutex locked.
 309  */
 310 static int ttm_bo_add_ttm(struct ttm_buffer_object *bo, bool zero_alloc)
 311 {
 312         struct ttm_bo_device *bdev = bo->bdev;
 313         struct ttm_bo_global *glob = bo->glob;
 314         int ret = 0;
 315         uint32_t page_flags = 0;
 316
 317         TTM_ASSERT_LOCKED(&bo->mutex);
 318         bo->ttm = NULL;
 319
 320         if (bdev->need_dma32)
 321                 page_flags |= TTM_PAGE_FLAG_DMA32;
 322
 323         switch (bo->type) {
 324         case ttm_bo_type_device:
 325                 if (zero_alloc)
 326                         page_flags |= TTM_PAGE_FLAG_ZERO_ALLOC;
 327         case ttm_bo_type_kernel:
 328                 bo->ttm = ttm_tt_create(bdev, bo->num_pages << PAGE_SHIFT,
 329                                         page_flags, glob->dummy_read_page);
 330                 if (unlikely(bo->ttm == NULL))
 331                         ret = -ENOMEM;
 332                 break;
 333         case ttm_bo_type_user:
 334                 bo->ttm = ttm_tt_create(bdev, bo->num_pages << PAGE_SHIFT,
 335                                         page_flags | TTM_PAGE_FLAG_USER,
 336                                         glob->dummy_read_page);
 337                 if (unlikely(bo->ttm == NULL)) {
 338                         ret = -ENOMEM;
 339                         break;
 340                 }
 341
 342                 ret = ttm_tt_set_user(bo->ttm, current,
 343                                       bo->buffer_start, bo->num_pages);
 344                 if (unlikely(ret != 0))
 345                         ttm_tt_destroy(bo->ttm);
 346                 break;
 347         default:
 348                 printk(KERN_ERR TTM_PFX "Illegal buffer object type\n");
 349                 ret = -EINVAL;
 350                 break;
 351         }
 352
 353         return ret;
 354 }
 355
 356 static int ttm_bo_handle_move_mem(struct ttm_buffer_object *bo,
 357                                   struct ttm_mem_reg *mem,
 358                                   bool evict, bool interruptible,
 359                                   bool no_wait_reserve, bool no_wait_gpu)
 360 {
 361         struct ttm_bo_device *bdev = bo->bdev;
 362         bool old_is_pci = ttm_mem_reg_is_pci(bdev, &bo->mem);
 363         bool new_is_pci = ttm_mem_reg_is_pci(bdev, mem);
 364         struct ttm_mem_type_manager *old_man = &bdev->man[bo->mem.mem_type];
 365         struct ttm_mem_type_manager *new_man = &bdev->man[mem->mem_type];
 366         int ret = 0;
 367
 368         if (old_is_pci || new_is_pci ||
 369             ((mem->placement & bo->mem.placement & TTM_PL_MASK_CACHING) == 0))
 370                 ttm_bo_unmap_virtual(bo);
 371
 372         /*
 373          * Create and bind a ttm if required.
 374          */
 375
 376         if (!(new_man->flags & TTM_MEMTYPE_FLAG_FIXED) && (bo->ttm == NULL)) {
 377                 ret = ttm_bo_add_ttm(bo, false);
 378                 if (ret)
 379                         goto out_err;
 380
 381                 ret = ttm_tt_set_placement_caching(bo->ttm, mem->placement);
 382                 if (ret)
 383                         goto out_err;
 384
 385                 if (mem->mem_type != TTM_PL_SYSTEM) {
 386                         ret = ttm_tt_bind(bo->ttm, mem);
 387                         if (ret)
 388                                 goto out_err;
 389                 }
 390
 391                 if (bo->mem.mem_type == TTM_PL_SYSTEM) {
 392                         bo->mem = *mem;
 393                         mem->mm_node = NULL;
 394                         goto moved;
 395                 }
 396
 397         }
 398
 399         if (bdev->driver->move_notify)
 400                 bdev->driver->move_notify(bo, mem);
 401
 402         if (!(old_man->flags & TTM_MEMTYPE_FLAG_FIXED) &&
 403             !(new_man->flags & TTM_MEMTYPE_FLAG_FIXED))
 404                 ret = ttm_bo_move_ttm(bo, evict, no_wait_reserve, no_wait_gpu, mem);
 405         else if (bdev->driver->move)
 406                 ret = bdev->driver->move(bo, evict, interruptible,
 407                                          no_wait_reserve, no_wait_gpu, mem);
 408         else
 409                 ret = ttm_bo_move_memcpy(bo, evict, no_wait_reserve, no_wait_gpu, mem);
 410
 411         if (ret)
 412                 goto out_err;
 413
 414 moved:
 415         if (bo->evicted) {
 416                 ret = bdev->driver->invalidate_caches(bdev, bo->mem.placement);
 417                 if (ret)
 418                         printk(KERN_ERR TTM_PFX "Can not flush read caches\n");
 419                 bo->evicted = false;
 420         }
 421
 422         if (bo->mem.mm_node) {
 423                 spin_lock(&bo->lock);
 424                 bo->offset = (bo->mem.start << PAGE_SHIFT) +
 425                     bdev->man[bo->mem.mem_type].gpu_offset;
 426                 bo->cur_placement = bo->mem.placement;
 427                 spin_unlock(&bo->lock);
 428         } else
 429                 bo->offset = 0;
 430
 431         return 0;
 432
 433 out_err:
 434         new_man = &bdev->man[bo->mem.mem_type];
 435         if ((new_man->flags & TTM_MEMTYPE_FLAG_FIXED) && bo->ttm) {
 436                 ttm_tt_unbind(bo->ttm);
 437                 ttm_tt_destroy(bo->ttm);
 438                 bo->ttm = NULL;
 439         }
 440
 441         return ret;
 442 }
 443
 444 /**
 445  * Call bo::reserved.
 446  * Will release GPU memory type usage on destruction.
 447  * This is the place to put in driver specific hooks to release
 448  * driver private resources.
 449  * Will release the bo::reserved lock.
 450  */
 451
 452 static void ttm_bo_cleanup_memtype_use(struct ttm_buffer_object *bo)
 453 {
 454         if (bo->ttm) {
 455                 ttm_tt_unbind(bo->ttm);
 456                 ttm_tt_destroy(bo->ttm);
 457                 bo->ttm = NULL;
 458         }
 459
 460         ttm_bo_mem_put(bo, &bo->mem);
 461
 462         atomic_set(&bo->reserved, 0);
 463
 464         /*
 465          * Make processes trying to reserve really pick it up.
 466          */
 467         smp_mb__after_atomic_dec();
 468         wake_up_all(&bo->event_queue);
 469 }
 470
 471 static void ttm_bo_cleanup_refs_or_queue(struct ttm_buffer_object *bo)
 472 {
 473         struct ttm_bo_device *bdev = bo->bdev;
 474         struct ttm_bo_global *glob = bo->glob;
 475         struct ttm_bo_driver *driver;
 476         void *sync_obj = NULL;
 477         void *sync_obj_arg;
 478         int put_count;
 479         int ret;
 480
 481         spin_lock(&bo->lock);
 482         (void) ttm_bo_wait(bo, false, false, true);
 483         if (!bo->sync_obj) {
 484
 485                 spin_lock(&glob->lru_lock);
 486
 487                 /**
 488                  * Lock inversion between bo::reserve and bo::lock here,
 489                  * but that's OK, since we're only trylocking.
 490                  */
 491
 492                 ret = ttm_bo_reserve_locked(bo, false, true, false, 0);
 493
 494                 if (unlikely(ret == -EBUSY))
 495                         goto queue;
 496
 497                 spin_unlock(&bo->lock);
 498                 put_count = ttm_bo_del_from_lru(bo);
 499
 500                 spin_unlock(&glob->lru_lock);
 501                 ttm_bo_cleanup_memtype_use(bo);
 502
 503                 ttm_bo_list_ref_sub(bo, put_count, true);
 504
 505                 return;
 506         } else {
 507                 spin_lock(&glob->lru_lock);
 508         }
 509 queue:
 510         driver = bdev->driver;
 511         if (bo->sync_obj)
 512                 sync_obj = driver->sync_obj_ref(bo->sync_obj);
 513         sync_obj_arg = bo->sync_obj_arg;
 514
 515         kref_get(&bo->list_kref);
 516         list_add_tail(&bo->ddestroy, &bdev->ddestroy);
 517         spin_unlock(&glob->lru_lock);
 518         spin_unlock(&bo->lock);
 519
 520         if (sync_obj) {
 521                 driver->sync_obj_flush(sync_obj, sync_obj_arg);
 522                 driver->sync_obj_unref(&sync_obj);
 523         }
 524         schedule_delayed_work(&bdev->wq,
 525                               ((HZ / 100) < 1) ? 1 : HZ / 100);
 526 }
 527
 528 /**
 529  * function ttm_bo_cleanup_refs
 530  * If bo idle, remove from delayed- and lru lists, and unref.
 531  * If not idle, do nothing.
 532  *
 533  * @interruptible         Any sleeps should occur interruptibly.
 534  * @no_wait_reserve       Never wait for reserve. Return -EBUSY instead.
 535  * @no_wait_gpu           Never wait for gpu. Return -EBUSY instead.
 536  */
 537
 538 static int ttm_bo_cleanup_refs(struct ttm_buffer_object *bo,
 539                                bool interruptible,
 540                                bool no_wait_reserve,
 541                                bool no_wait_gpu)
 542 {
 543         struct ttm_bo_global *glob = bo->glob;
 544         int put_count;
 545         int ret = 0;
 546
 547 retry:
 548         spin_lock(&bo->lock);
 549         ret = ttm_bo_wait(bo, false, interruptible, no_wait_gpu);
 550         spin_unlock(&bo->lock);
 551
 552         if (unlikely(ret != 0))
 553                 return ret;
 554
 555         spin_lock(&glob->lru_lock);
 556         ret = ttm_bo_reserve_locked(bo, interruptible,
 557                                     no_wait_reserve, false, 0);
 558
 559         if (unlikely(ret != 0) || list_empty(&bo->ddestroy)) {
 560                 spin_unlock(&glob->lru_lock);
 561                 return ret;
 562         }
 563
 564         /**
 565          * We can re-check for sync object without taking
 566          * the bo::lock since setting the sync object requires
 567          * also bo::reserved. A busy object at this point may
 568          * be caused by another thread recently starting an accelerated
 569          * eviction.
 570          */
 571
 572         if (unlikely(bo->sync_obj)) {
 573                 atomic_set(&bo->reserved, 0);
 574                 wake_up_all(&bo->event_queue);
 575                 spin_unlock(&glob->lru_lock);
 576                 goto retry;
 577         }
 578
 579         put_count = ttm_bo_del_from_lru(bo);
 580         list_del_init(&bo->ddestroy);
 581         ++put_count;
 582
 583         spin_unlock(&glob->lru_lock);
 584         ttm_bo_cleanup_memtype_use(bo);
 585
 586         ttm_bo_list_ref_sub(bo, put_count, true);
 587
 588         return 0;
 589 }
 590
 591 /**
 592  * Traverse the delayed list, and call ttm_bo_cleanup_refs on all
 593  * encountered buffers.
 594  */
 595
 596 static int ttm_bo_delayed_delete(struct ttm_bo_device *bdev, bool remove_all)
 597 {
 598         struct ttm_bo_global *glob = bdev->glob;
 599         struct ttm_buffer_object *entry = NULL;
 600         int ret = 0;
 601
 602         spin_lock(&glob->lru_lock);
 603         if (list_empty(&bdev->ddestroy))
 604                 goto out_unlock;
 605
 606         entry = list_first_entry(&bdev->ddestroy,
 607                 struct ttm_buffer_object, ddestroy);
 608         kref_get(&entry->list_kref);
 609
 610         for (;;) {
 611                 struct ttm_buffer_object *nentry = NULL;
 612
 613                 if (entry->ddestroy.next != &bdev->ddestroy) {
 614                         nentry = list_first_entry(&entry->ddestroy,
 615                                 struct ttm_buffer_object, ddestroy);
 616                         kref_get(&nentry->list_kref);
 617                 }
 618
 619                 spin_unlock(&glob->lru_lock);
 620                 ret = ttm_bo_cleanup_refs(entry, false, !remove_all,
 621                                           !remove_all);
 622                 kref_put(&entry->list_kref, ttm_bo_release_list);
 623                 entry = nentry;
 624
 625                 if (ret || !entry)
 626                         goto out;
 627
 628                 spin_lock(&glob->lru_lock);
 629                 if (list_empty(&entry->ddestroy))
 630                         break;
 631         }
 632
 633 out_unlock:
 634         spin_unlock(&glob->lru_lock);
 635 out:
 636         if (entry)
 637                 kref_put(&entry->list_kref, ttm_bo_release_list);
 638         return ret;
 639 }
 640
 641 static void ttm_bo_delayed_workqueue(struct work_struct *work)
 642 {
 643         struct ttm_bo_device *bdev =
 644             container_of(work, struct ttm_bo_device, wq.work);
 645
 646         if (ttm_bo_delayed_delete(bdev, false)) {
 647                 schedule_delayed_work(&bdev->wq,
 648                                       ((HZ / 100) < 1) ? 1 : HZ / 100);
 649         }
 650 }
 651
 652 static void ttm_bo_release(struct kref *kref)
 653 {
 654         struct ttm_buffer_object *bo =
 655             container_of(kref, struct ttm_buffer_object, kref);
 656         struct ttm_bo_device *bdev = bo->bdev;
 657
 658         if (likely(bo->vm_node != NULL)) {
 659                 rb_erase(&bo->vm_rb, &bdev->addr_space_rb);
 660                 drm_mm_put_block(bo->vm_node);
 661                 bo->vm_node = NULL;
 662         }
 663         write_unlock(&bdev->vm_lock);
 664         ttm_bo_cleanup_refs_or_queue(bo);
 665         kref_put(&bo->list_kref, ttm_bo_release_list);
 666         write_lock(&bdev->vm_lock);
 667 }
 668
 669 void ttm_bo_unref(struct ttm_buffer_object **p_bo)
 670 {
 671         struct ttm_buffer_object *bo = *p_bo;
 672         struct ttm_bo_device *bdev = bo->bdev;
 673
 674         *p_bo = NULL;
 675         write_lock(&bdev->vm_lock);
 676         kref_put(&bo->kref, ttm_bo_release);
 677         write_unlock(&bdev->vm_lock);
 678 }
 679 EXPORT_SYMBOL(ttm_bo_unref);
 680
 681 int ttm_bo_lock_delayed_workqueue(struct ttm_bo_device *bdev)
 682 {
 683         return cancel_delayed_work_sync(&bdev->wq);
 684 }
 685 EXPORT_SYMBOL(ttm_bo_lock_delayed_workqueue);
 686
 687 void ttm_bo_unlock_delayed_workqueue(struct ttm_bo_device *bdev, int resched)
 688 {
 689         if (resched)
 690                 schedule_delayed_work(&bdev->wq,
 691                                       ((HZ / 100) < 1) ? 1 : HZ / 100);
 692 }
 693 EXPORT_SYMBOL(ttm_bo_unlock_delayed_workqueue);
 694
 695 static int ttm_bo_evict(struct ttm_buffer_object *bo, bool interruptible,
 696                         bool no_wait_reserve, bool no_wait_gpu)
 697 {
 698         struct ttm_bo_device *bdev = bo->bdev;
 699         struct ttm_mem_reg evict_mem;
 700         struct ttm_placement placement;
 701         int ret = 0;
 702
 703         spin_lock(&bo->lock);
 704         ret = ttm_bo_wait(bo, false, interruptible, no_wait_gpu);
 705         spin_unlock(&bo->lock);
 706
 707         if (unlikely(ret != 0)) {
 708                 if (ret != -ERESTARTSYS) {
 709                         printk(KERN_ERR TTM_PFX
 710                                "Failed to expire sync object before "
 711                                "buffer eviction.\n");
 712                 }
 713                 goto out;
 714         }
 715
 716         BUG_ON(!atomic_read(&bo->reserved));
 717
 718         evict_mem = bo->mem;
 719         evict_mem.mm_node = NULL;
 720         evict_mem.bus.io_reserved = false;
 721
 722         placement.fpfn = 0;
 723         placement.lpfn = 0;
 724         placement.num_placement = 0;
 725         placement.num_busy_placement = 0;
 726         bdev->driver->evict_flags(bo, &placement);
 727         ret = ttm_bo_mem_space(bo, &placement, &evict_mem, interruptible,
 728                                 no_wait_reserve, no_wait_gpu);
 729         if (ret) {
 730                 if (ret != -ERESTARTSYS) {
 731                         printk(KERN_ERR TTM_PFX
 732                                "Failed to find memory space for "
 733                                "buffer 0x%p eviction.\n", bo);
 734                         ttm_bo_mem_space_debug(bo, &placement);
 735                 }
 736                 goto out;
 737         }
 738
 739         ret = ttm_bo_handle_move_mem(bo, &evict_mem, true, interruptible,
 740                                      no_wait_reserve, no_wait_gpu);
 741         if (ret) {
 742                 if (ret != -ERESTARTSYS)
 743                         printk(KERN_ERR TTM_PFX "Buffer eviction failed\n");
 744                 ttm_bo_mem_put(bo, &evict_mem);
 745                 goto out;
 746         }
 747         bo->evicted = true;
 748 out:
 749         return ret;
 750 }
 751
 752 static int ttm_mem_evict_first(struct ttm_bo_device *bdev,
 753                                 uint32_t mem_type,
 754                                 bool interruptible, bool no_wait_reserve,
 755                                 bool no_wait_gpu)
 756 {
 757         struct ttm_bo_global *glob = bdev->glob;
 758         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
 759         struct ttm_buffer_object *bo;
 760         int ret, put_count = 0;
 761
 762 retry:
 763         spin_lock(&glob->lru_lock);
 764         if (list_empty(&man->lru)) {
 765                 spin_unlock(&glob->lru_lock);
 766                 return -EBUSY;
 767         }
 768
 769         bo = list_first_entry(&man->lru, struct ttm_buffer_object, lru);
 770         kref_get(&bo->list_kref);
 771
 772         if (!list_empty(&bo->ddestroy)) {
 773                 spin_unlock(&glob->lru_lock);
 774                 ret = ttm_bo_cleanup_refs(bo, interruptible,
 775                                           no_wait_reserve, no_wait_gpu);
 776                 kref_put(&bo->list_kref, ttm_bo_release_list);
 777
 778                 if (likely(ret == 0 || ret == -ERESTARTSYS))
 779                         return ret;
 780
 781                 goto retry;
 782         }
 783
 784         ret = ttm_bo_reserve_locked(bo, false, no_wait_reserve, false, 0);
 785
 786         if (unlikely(ret == -EBUSY)) {
 787                 spin_unlock(&glob->lru_lock);
 788                 if (likely(!no_wait_gpu))
 789                         ret = ttm_bo_wait_unreserved(bo, interruptible);
 790
 791                 kref_put(&bo->list_kref, ttm_bo_release_list);
 792
 793                 /**
 794                  * We *need* to retry after releasing the lru lock.
 795                  */
 796
 797                 if (unlikely(ret != 0))
 798                         return ret;
 799                 goto retry;
 800         }
 801
 802         put_count = ttm_bo_del_from_lru(bo);
 803         spin_unlock(&glob->lru_lock);
 804
 805         BUG_ON(ret != 0);
 806
 807         ttm_bo_list_ref_sub(bo, put_count, true);
 808
 809         ret = ttm_bo_evict(bo, interruptible, no_wait_reserve, no_wait_gpu);
 810         ttm_bo_unreserve(bo);
 811
 812         kref_put(&bo->list_kref, ttm_bo_release_list);
 813         return ret;
 814 }
 815
 816 void ttm_bo_mem_put(struct ttm_buffer_object *bo, struct ttm_mem_reg *mem)
 817 {
 818         struct ttm_mem_type_manager *man = &bo->bdev->man[mem->mem_type];
 819
 820         if (mem->mm_node)
 821                 (*man->func->put_node)(man, mem);
 822 }
 823 EXPORT_SYMBOL(ttm_bo_mem_put);
 824
 825 /**
 826  * Repeatedly evict memory from the LRU for @mem_type until we create enough
 827  * space, or we've evicted everything and there isn't enough space.
 828  */
 829 static int ttm_bo_mem_force_space(struct ttm_buffer_object *bo,
 830                                         uint32_t mem_type,
 831                                         struct ttm_placement *placement,
 832                                         struct ttm_mem_reg *mem,
 833                                         bool interruptible,
 834                                         bool no_wait_reserve,
 835                                         bool no_wait_gpu)
 836 {
 837         struct ttm_bo_device *bdev = bo->bdev;
 838         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
 839         int ret;
 840
 841         do {
 842                 ret = (*man->func->get_node)(man, bo, placement, mem);
 843                 if (unlikely(ret != 0))
 844                         return ret;
 845                 if (mem->mm_node)
 846                         break;
 847                 ret = ttm_mem_evict_first(bdev, mem_type, interruptible,
 848                                                 no_wait_reserve, no_wait_gpu);
 849                 if (unlikely(ret != 0))
 850                         return ret;
 851         } while (1);
 852         if (mem->mm_node == NULL)
 853                 return -ENOMEM;
 854         mem->mem_type = mem_type;
 855         return 0;
 856 }
 857
 858 static uint32_t ttm_bo_select_caching(struct ttm_mem_type_manager *man,
 859                                       uint32_t cur_placement,
 860                                       uint32_t proposed_placement)
 861 {
 862         uint32_t caching = proposed_placement & TTM_PL_MASK_CACHING;
 863         uint32_t result = proposed_placement & ~TTM_PL_MASK_CACHING;
 864
 865         /**
 866          * Keep current caching if possible.
 867          */
 868
 869         if ((cur_placement & caching) != 0)
 870                 result |= (cur_placement & caching);
 871         else if ((man->default_caching & caching) != 0)
 872                 result |= man->default_caching;
 873         else if ((TTM_PL_FLAG_CACHED & caching) != 0)
 874                 result |= TTM_PL_FLAG_CACHED;
 875         else if ((TTM_PL_FLAG_WC & caching) != 0)
 876                 result |= TTM_PL_FLAG_WC;
 877         else if ((TTM_PL_FLAG_UNCACHED & caching) != 0)
 878                 result |= TTM_PL_FLAG_UNCACHED;
 879
 880         return result;
 881 }
 882
 883 static bool ttm_bo_mt_compatible(struct ttm_mem_type_manager *man,
 884                                  bool disallow_fixed,
 885                                  uint32_t mem_type,
 886                                  uint32_t proposed_placement,
 887                                  uint32_t *masked_placement)
 888 {
 889         uint32_t cur_flags = ttm_bo_type_flags(mem_type);
 890
 891         if ((man->flags & TTM_MEMTYPE_FLAG_FIXED) && disallow_fixed)
 892                 return false;
 893
 894         if ((cur_flags & proposed_placement & TTM_PL_MASK_MEM) == 0)
 895                 return false;
 896
 897         if ((proposed_placement & man->available_caching) == 0)
 898                 return false;
 899
 900         cur_flags |= (proposed_placement & man->available_caching);
 901
 902         *masked_placement = cur_flags;
 903         return true;
 904 }
 905
 906 /**
 907  * Creates space for memory region @mem according to its type.
 908  *
 909  * This function first searches for free space in compatible memory types in
 910  * the priority order defined by the driver.  If free space isn't found, then
 911  * ttm_bo_mem_force_space is attempted in priority order to evict and find
 912  * space.
 913  */
 914 int ttm_bo_mem_space(struct ttm_buffer_object *bo,
 915                         struct ttm_placement *placement,
 916                         struct ttm_mem_reg *mem,
 917                         bool interruptible, bool no_wait_reserve,
 918                         bool no_wait_gpu)
 919 {
 920         struct ttm_bo_device *bdev = bo->bdev;
 921         struct ttm_mem_type_manager *man;
 922         uint32_t mem_type = TTM_PL_SYSTEM;
 923         uint32_t cur_flags = 0;
 924         bool type_found = false;
 925         bool type_ok = false;
 926         bool has_erestartsys = false;
 927         int i, ret;
 928
 929         mem->mm_node = NULL;
 930         for (i = 0; i < placement->num_placement; ++i) {
 931                 ret = ttm_mem_type_from_flags(placement->placement[i],
 932                                                 &mem_type);
 933                 if (ret)
 934                         return ret;
 935                 man = &bdev->man[mem_type];
 936
 937                 type_ok = ttm_bo_mt_compatible(man,
 938                                                 bo->type == ttm_bo_type_user,
 939                                                 mem_type,
 940                                                 placement->placement[i],
 941                                                 &cur_flags);
 942
 943                 if (!type_ok)
 944                         continue;
 945
 946                 cur_flags = ttm_bo_select_caching(man, bo->mem.placement,
 947                                                   cur_flags);
 948                 /*
 949                  * Use the access and other non-mapping-related flag bits from
 950                  * the memory placement flags to the current flags
 951                  */
 952                 ttm_flag_masked(&cur_flags, placement->placement[i],
 953                                 ~TTM_PL_MASK_MEMTYPE);
 954
 955                 if (mem_type == TTM_PL_SYSTEM)
 956                         break;
 957
 958                 if (man->has_type && man->use_type) {
 959                         type_found = true;
 960                         ret = (*man->func->get_node)(man, bo, placement, mem);
 961                         if (unlikely(ret))
 962                                 return ret;
 963                 }
 964                 if (mem->mm_node)
 965                         break;
 966         }
 967
 968         if ((type_ok && (mem_type == TTM_PL_SYSTEM)) || mem->mm_node) {
 969                 mem->mem_type = mem_type;
 970                 mem->placement = cur_flags;
 971                 return 0;
 972         }
 973
 974         if (!type_found)
 975                 return -EINVAL;
 976
 977         for (i = 0; i < placement->num_busy_placement; ++i) {
 978                 ret = ttm_mem_type_from_flags(placement->busy_placement[i],
 979                                                 &mem_type);
 980                 if (ret)
 981                         return ret;
 982                 man = &bdev->man[mem_type];
 983                 if (!man->has_type)
 984                         continue;
 985                 if (!ttm_bo_mt_compatible(man,
 986                                                 bo->type == ttm_bo_type_user,
 987                                                 mem_type,
 988                                                 placement->busy_placement[i],
 989                                                 &cur_flags))
 990                         continue;
 991
 992                 cur_flags = ttm_bo_select_caching(man, bo->mem.placement,
 993                                                   cur_flags);
 994                 /*
 995                  * Use the access and other non-mapping-related flag bits from
 996                  * the memory placement flags to the current flags
 997                  */
 998                 ttm_flag_masked(&cur_flags, placement->busy_placement[i],
 999                                 ~TTM_PL_MASK_MEMTYPE);
1000
1001
1002                 if (mem_type == TTM_PL_SYSTEM) {
1003                         mem->mem_type = mem_type;
1004                         mem->placement = cur_flags;
1005                         mem->mm_node = NULL;
1006                         return 0;
1007                 }
1008
1009                 ret = ttm_bo_mem_force_space(bo, mem_type, placement, mem,
1010                                                 interruptible, no_wait_reserve, no_wait_gpu);
1011                 if (ret == 0 && mem->mm_node) {
1012                         mem->placement = cur_flags;
1013                         return 0;
1014                 }
1015                 if (ret == -ERESTARTSYS)
1016                         has_erestartsys = true;
1017         }
1018         ret = (has_erestartsys) ? -ERESTARTSYS : -ENOMEM;
1019         return ret;
1020 }
1021 EXPORT_SYMBOL(ttm_bo_mem_space);
1022
1023 int ttm_bo_wait_cpu(struct ttm_buffer_object *bo, bool no_wait)
1024 {
1025         if ((atomic_read(&bo->cpu_writers) > 0) && no_wait)
1026                 return -EBUSY;
1027
1028         return wait_event_interruptible(bo->event_queue,
1029                                         atomic_read(&bo->cpu_writers) == 0);
1030 }
1031 EXPORT_SYMBOL(ttm_bo_wait_cpu);
1032
1033 int ttm_bo_move_buffer(struct ttm_buffer_object *bo,
1034                         struct ttm_placement *placement,
1035                         bool interruptible, bool no_wait_reserve,
1036                         bool no_wait_gpu)
1037 {
1038         int ret = 0;
1039         struct ttm_mem_reg mem;
1040
1041         BUG_ON(!atomic_read(&bo->reserved));
1042
1043         /*
1044          * FIXME: It's possible to pipeline buffer moves.
1045          * Have the driver move function wait for idle when necessary,
1046          * instead of doing it here.
1047          */
1048         spin_lock(&bo->lock);
1049         ret = ttm_bo_wait(bo, false, interruptible, no_wait_gpu);
1050         spin_unlock(&bo->lock);
1051         if (ret)
1052                 return ret;
1053         mem.num_pages = bo->num_pages;
1054         mem.size = mem.num_pages << PAGE_SHIFT;
1055         mem.page_alignment = bo->mem.page_alignment;
1056         mem.bus.io_reserved = false;
1057         /*
1058          * Determine where to move the buffer.
1059          */
1060         ret = ttm_bo_mem_space(bo, placement, &mem, interruptible, no_wait_reserve, no_wait_gpu);
1061         if (ret)
1062                 goto out_unlock;
1063         ret = ttm_bo_handle_move_mem(bo, &mem, false, interruptible, no_wait_reserve, no_wait_gpu);
1064 out_unlock:
1065         if (ret && mem.mm_node)
1066                 ttm_bo_mem_put(bo, &mem);
1067         return ret;
1068 }
1069
1070 static int ttm_bo_mem_compat(struct ttm_placement *placement,
1071                              struct ttm_mem_reg *mem)
1072 {
1073         int i;
1074
1075         if (mem->mm_node && placement->lpfn != 0 &&
1076             (mem->start < placement->fpfn ||
1077              mem->start + mem->num_pages > placement->lpfn))
1078                 return -1;
1079
1080         for (i = 0; i < placement->num_placement; i++) {
1081                 if ((placement->placement[i] & mem->placement &
1082                         TTM_PL_MASK_CACHING) &&
1083                         (placement->placement[i] & mem->placement &
1084                         TTM_PL_MASK_MEM))
1085                         return i;
1086         }
1087         return -1;
1088 }
1089
1090 int ttm_bo_validate(struct ttm_buffer_object *bo,
1091                         struct ttm_placement *placement,
1092                         bool interruptible, bool no_wait_reserve,
1093                         bool no_wait_gpu)
1094 {
1095         int ret;
1096
1097         BUG_ON(!atomic_read(&bo->reserved));
1098         /* Check that range is valid */
1099         if (placement->lpfn || placement->fpfn)
1100                 if (placement->fpfn > placement->lpfn ||
1101                         (placement->lpfn - placement->fpfn) < bo->num_pages)
1102                         return -EINVAL;
1103         /*
1104          * Check whether we need to move buffer.
1105          */
1106         ret = ttm_bo_mem_compat(placement, &bo->mem);
1107         if (ret < 0) {
1108                 ret = ttm_bo_move_buffer(bo, placement, interruptible, no_wait_reserve, no_wait_gpu);
1109                 if (ret)
1110                         return ret;
1111         } else {
1112                 /*
1113                  * Use the access and other non-mapping-related flag bits from
1114                  * the compatible memory placement flags to the active flags
1115                  */
1116                 ttm_flag_masked(&bo->mem.placement, placement->placement[ret],
1117                                 ~TTM_PL_MASK_MEMTYPE);
1118         }
1119         /*
1120          * We might need to add a TTM.
1121          */
1122         if (bo->mem.mem_type == TTM_PL_SYSTEM && bo->ttm == NULL) {
1123                 ret = ttm_bo_add_ttm(bo, true);
1124                 if (ret)
1125                         return ret;
1126         }
1127         return 0;
1128 }
1129 EXPORT_SYMBOL(ttm_bo_validate);
1130
1131 int ttm_bo_check_placement(struct ttm_buffer_object *bo,
1132                                 struct ttm_placement *placement)
1133 {
1134         BUG_ON((placement->fpfn || placement->lpfn) &&
1135                (bo->mem.num_pages > (placement->lpfn - placement->fpfn)));
1136
1137         return 0;
1138 }
1139
1140 int ttm_bo_init(struct ttm_bo_device *bdev,
1141                 struct ttm_buffer_object *bo,
1142                 unsigned long size,
1143                 enum ttm_bo_type type,
1144                 struct ttm_placement *placement,
1145                 uint32_t page_alignment,
1146                 unsigned long buffer_start,
1147                 bool interruptible,
1148                 struct file *persistant_swap_storage,
1149                 size_t acc_size,
1150                 void (*destroy) (struct ttm_buffer_object *))
1151 {
1152         int ret = 0;
1153         unsigned long num_pages;
1154
1155         size += buffer_start & ~PAGE_MASK;
1156         num_pages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
1157         if (num_pages == 0) {
1158                 printk(KERN_ERR TTM_PFX "Illegal buffer object size.\n");
1159                 if (destroy)
1160                         (*destroy)(bo);
1161                 else
1162                         kfree(bo);
1163                 return -EINVAL;
1164         }
1165         bo->destroy = destroy;
1166
1167         spin_lock_init(&bo->lock);
1168         kref_init(&bo->kref);
1169         kref_init(&bo->list_kref);
1170         atomic_set(&bo->cpu_writers, 0);
1171         atomic_set(&bo->reserved, 1);
1172         init_waitqueue_head(&bo->event_queue);
1173         INIT_LIST_HEAD(&bo->lru);
1174         INIT_LIST_HEAD(&bo->ddestroy);
1175         INIT_LIST_HEAD(&bo->swap);
1176         bo->bdev = bdev;
1177         bo->glob = bdev->glob;
1178         bo->type = type;
1179         bo->num_pages = num_pages;
1180         bo->mem.size = num_pages << PAGE_SHIFT;
1181         bo->mem.mem_type = TTM_PL_SYSTEM;
1182         bo->mem.num_pages = bo->num_pages;
1183         bo->mem.mm_node = NULL;
1184         bo->mem.page_alignment = page_alignment;
1185         bo->mem.bus.io_reserved = false;
1186         bo->buffer_start = buffer_start & PAGE_MASK;
1187         bo->priv_flags = 0;
1188         bo->mem.placement = (TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED);
1189         bo->seq_valid = false;
1190         bo->persistant_swap_storage = persistant_swap_storage;
1191         bo->acc_size = acc_size;
1192         atomic_inc(&bo->glob->bo_count);
1193
1194         ret = ttm_bo_check_placement(bo, placement);
1195         if (unlikely(ret != 0))
1196                 goto out_err;
1197
1198         /*
1199          * For ttm_bo_type_device buffers, allocate
1200          * address space from the device.
1201          */
1202         if (bo->type == ttm_bo_type_device) {
1203                 ret = ttm_bo_setup_vm(bo);
1204                 if (ret)
1205                         goto out_err;
1206         }
1207
1208         ret = ttm_bo_validate(bo, placement, interruptible, false, false);
1209         if (ret)
1210                 goto out_err;
1211
1212         ttm_bo_unreserve(bo);
1213         return 0;
1214
1215 out_err:
1216         ttm_bo_unreserve(bo);
1217         ttm_bo_unref(&bo);
1218
1219         return ret;
1220 }
1221 EXPORT_SYMBOL(ttm_bo_init);
1222
1223 static inline size_t ttm_bo_size(struct ttm_bo_global *glob,
1224                                  unsigned long num_pages)
1225 {
1226         size_t page_array_size = (num_pages * sizeof(void *) + PAGE_SIZE - 1) &
1227             PAGE_MASK;
1228
1229         return glob->ttm_bo_size + 2 * page_array_size;
1230 }
1231
1232 int ttm_bo_create(struct ttm_bo_device *bdev,
1233                         unsigned long size,
1234                         enum ttm_bo_type type,
1235                         struct ttm_placement *placement,
1236                         uint32_t page_alignment,
1237                         unsigned long buffer_start,
1238                         bool interruptible,
1239                         struct file *persistant_swap_storage,
1240                         struct ttm_buffer_object **p_bo)
1241 {
1242         struct ttm_buffer_object *bo;
1243         struct ttm_mem_global *mem_glob = bdev->glob->mem_glob;
1244         int ret;
1245
1246         size_t acc_size =
1247             ttm_bo_size(bdev->glob, (size + PAGE_SIZE - 1) >> PAGE_SHIFT);
1248         ret = ttm_mem_global_alloc(mem_glob, acc_size, false, false);
1249         if (unlikely(ret != 0))
1250                 return ret;
1251
1252         bo = kzalloc(sizeof(*bo), GFP_KERNEL);
1253
1254         if (unlikely(bo == NULL)) {
1255                 ttm_mem_global_free(mem_glob, acc_size);
1256                 return -ENOMEM;
1257         }
1258
1259         ret = ttm_bo_init(bdev, bo, size, type, placement, page_alignment,
1260                                 buffer_start, interruptible,
1261                                 persistant_swap_storage, acc_size, NULL);
1262         if (likely(ret == 0))
1263                 *p_bo = bo;
1264
1265         return ret;
1266 }
1267
1268 static int ttm_bo_force_list_clean(struct ttm_bo_device *bdev,
1269                                         unsigned mem_type, bool allow_errors)
1270 {
1271         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
1272         struct ttm_bo_global *glob = bdev->glob;
1273         int ret;
1274
1275         /*
1276          * Can't use standard list traversal since we're unlocking.
1277          */
1278
1279         spin_lock(&glob->lru_lock);
1280         while (!list_empty(&man->lru)) {
1281                 spin_unlock(&glob->lru_lock);
1282                 ret = ttm_mem_evict_first(bdev, mem_type, false, false, false);
1283                 if (ret) {
1284                         if (allow_errors) {
1285                                 return ret;
1286                         } else {
1287                                 printk(KERN_ERR TTM_PFX
1288                                         "Cleanup eviction failed\n");
1289                         }
1290                 }
1291                 spin_lock(&glob->lru_lock);
1292         }
1293         spin_unlock(&glob->lru_lock);
1294         return 0;
1295 }
1296
1297 int ttm_bo_clean_mm(struct ttm_bo_device *bdev, unsigned mem_type)
1298 {
1299         struct ttm_mem_type_manager *man;
1300         int ret = -EINVAL;
1301
1302         if (mem_type >= TTM_NUM_MEM_TYPES) {
1303                 printk(KERN_ERR TTM_PFX "Illegal memory type %d\n", mem_type);
1304                 return ret;
1305         }
1306         man = &bdev->man[mem_type];
1307
1308         if (!man->has_type) {
1309                 printk(KERN_ERR TTM_PFX "Trying to take down uninitialized "
1310                        "memory manager type %u\n", mem_type);
1311                 return ret;
1312         }
1313
1314         man->use_type = false;
1315         man->has_type = false;
1316
1317         ret = 0;
1318         if (mem_type > 0) {
1319                 ttm_bo_force_list_clean(bdev, mem_type, false);
1320
1321                 ret = (*man->func->takedown)(man);
1322         }
1323
1324         return ret;
1325 }
1326 EXPORT_SYMBOL(ttm_bo_clean_mm);
1327
1328 int ttm_bo_evict_mm(struct ttm_bo_device *bdev, unsigned mem_type)
1329 {
1330         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
1331
1332         if (mem_type == 0 || mem_type >= TTM_NUM_MEM_TYPES) {
1333                 printk(KERN_ERR TTM_PFX
1334                        "Illegal memory manager memory type %u.\n",
1335                        mem_type);
1336                 return -EINVAL;
1337         }
1338
1339         if (!man->has_type) {
1340                 printk(KERN_ERR TTM_PFX
1341                        "Memory type %u has not been initialized.\n",
1342                        mem_type);
1343                 return 0;
1344         }
1345
1346         return ttm_bo_force_list_clean(bdev, mem_type, true);
1347 }
1348 EXPORT_SYMBOL(ttm_bo_evict_mm);
1349
1350 int ttm_bo_init_mm(struct ttm_bo_device *bdev, unsigned type,
1351                         unsigned long p_size)
1352 {
1353         int ret = -EINVAL;
1354         struct ttm_mem_type_manager *man;
1355
1356         BUG_ON(type >= TTM_NUM_MEM_TYPES);
1357         man = &bdev->man[type];
1358         BUG_ON(man->has_type);
1359
1360         ret = bdev->driver->init_mem_type(bdev, type, man);
1361         if (ret)
1362                 return ret;
1363         man->bdev = bdev;
1364
1365         ret = 0;
1366         if (type != TTM_PL_SYSTEM) {
1367                 ret = (*man->func->init)(man, p_size);
1368                 if (ret)
1369                         return ret;
1370         }
1371         man->has_type = true;
1372         man->use_type = true;
1373         man->size = p_size;
1374
1375         INIT_LIST_HEAD(&man->lru);
1376
1377         return 0;
1378 }
1379 EXPORT_SYMBOL(ttm_bo_init_mm);
1380
1381 static void ttm_bo_global_kobj_release(struct kobject *kobj)
1382 {
1383         struct ttm_bo_global *glob =
1384                 container_of(kobj, struct ttm_bo_global, kobj);
1385
1386         ttm_mem_unregister_shrink(glob->mem_glob, &glob->shrink);
1387         __free_page(glob->dummy_read_page);
1388         kfree(glob);
1389 }
1390
1391 void ttm_bo_global_release(struct drm_global_reference *ref)
1392 {
1393         struct ttm_bo_global *glob = ref->object;
1394
1395         kobject_del(&glob->kobj);
1396         kobject_put(&glob->kobj);
1397 }
1398 EXPORT_SYMBOL(ttm_bo_global_release);
1399
1400 int ttm_bo_global_init(struct drm_global_reference *ref)
1401 {
1402         struct ttm_bo_global_ref *bo_ref =
1403                 container_of(ref, struct ttm_bo_global_ref, ref);
1404         struct ttm_bo_global *glob = ref->object;
1405         int ret;
1406
1407         mutex_init(&glob->device_list_mutex);
1408         spin_lock_init(&glob->lru_lock);
1409         glob->mem_glob = bo_ref->mem_glob;
1410         glob->dummy_read_page = alloc_page(__GFP_ZERO | GFP_DMA32);
1411
1412         if (unlikely(glob->dummy_read_page == NULL)) {
1413                 ret = -ENOMEM;
1414                 goto out_no_drp;
1415         }
1416
1417         INIT_LIST_HEAD(&glob->swap_lru);
1418         INIT_LIST_HEAD(&glob->device_list);
1419
1420         ttm_mem_init_shrink(&glob->shrink, ttm_bo_swapout);
1421         ret = ttm_mem_register_shrink(glob->mem_glob, &glob->shrink);
1422         if (unlikely(ret != 0)) {
1423                 printk(KERN_ERR TTM_PFX
1424                        "Could not register buffer object swapout.\n");
1425                 goto out_no_shrink;
1426         }
1427
1428         glob->ttm_bo_extra_size =
1429                 ttm_round_pot(sizeof(struct ttm_tt)) +
1430                 ttm_round_pot(sizeof(struct ttm_backend));
1431
1432         glob->ttm_bo_size = glob->ttm_bo_extra_size +
1433                 ttm_round_pot(sizeof(struct ttm_buffer_object));
1434
1435         atomic_set(&glob->bo_count, 0);
1436
1437         ret = kobject_init_and_add(
1438                 &glob->kobj, &ttm_bo_glob_kobj_type, ttm_get_kobj(), "buffer_objects");
1439         if (unlikely(ret != 0))
1440                 kobject_put(&glob->kobj);
1441         return ret;
1442 out_no_shrink:
1443         __free_page(glob->dummy_read_page);
1444 out_no_drp:
1445         kfree(glob);
1446         return ret;
1447 }
1448 EXPORT_SYMBOL(ttm_bo_global_init);
1449
1450
1451 int ttm_bo_device_release(struct ttm_bo_device *bdev)
1452 {
1453         int ret = 0;
1454         unsigned i = TTM_NUM_MEM_TYPES;
1455         struct ttm_mem_type_manager *man;
1456         struct ttm_bo_global *glob = bdev->glob;
1457
1458         while (i--) {
1459                 man = &bdev->man[i];
1460                 if (man->has_type) {
1461                         man->use_type = false;
1462                         if ((i != TTM_PL_SYSTEM) && ttm_bo_clean_mm(bdev, i)) {
1463                                 ret = -EBUSY;
1464                                 printk(KERN_ERR TTM_PFX
1465                                        "DRM memory manager type %d "
1466                                        "is not clean.\n", i);
1467                         }
1468                         man->has_type = false;
1469                 }
1470         }
1471
1472         mutex_lock(&glob->device_list_mutex);
1473         list_del(&bdev->device_list);
1474         mutex_unlock(&glob->device_list_mutex);
1475
1476         if (!cancel_delayed_work(&bdev->wq))
1477                 flush_scheduled_work();
1478
1479         while (ttm_bo_delayed_delete(bdev, true))
1480                 ;
1481
1482         spin_lock(&glob->lru_lock);
1483         if (list_empty(&bdev->ddestroy))
1484                 TTM_DEBUG("Delayed destroy list was clean\n");
1485
1486         if (list_empty(&bdev->man[0].lru))
1487                 TTM_DEBUG("Swap list was clean\n");
1488         spin_unlock(&glob->lru_lock);
1489
1490         BUG_ON(!drm_mm_clean(&bdev->addr_space_mm));
1491         write_lock(&bdev->vm_lock);
1492         drm_mm_takedown(&bdev->addr_space_mm);
1493         write_unlock(&bdev->vm_lock);
1494
1495         return ret;
1496 }
1497 EXPORT_SYMBOL(ttm_bo_device_release);
1498
1499 int ttm_bo_device_init(struct ttm_bo_device *bdev,
1500                        struct ttm_bo_global *glob,
1501                        struct ttm_bo_driver *driver,
1502                        uint64_t file_page_offset,
1503                        bool need_dma32)
1504 {
1505         int ret = -EINVAL;
1506
1507         rwlock_init(&bdev->vm_lock);
1508         bdev->driver = driver;
1509
1510         memset(bdev->man, 0, sizeof(bdev->man));
1511
1512         /*
1513          * Initialize the system memory buffer type.
1514          * Other types need to be driver / IOCTL initialized.
1515          */
1516         ret = ttm_bo_init_mm(bdev, TTM_PL_SYSTEM, 0);
1517         if (unlikely(ret != 0))
1518                 goto out_no_sys;
1519
1520         bdev->addr_space_rb = RB_ROOT;
1521         ret = drm_mm_init(&bdev->addr_space_mm, file_page_offset, 0x10000000);
1522         if (unlikely(ret != 0))
1523                 goto out_no_addr_mm;
1524
1525         INIT_DELAYED_WORK(&bdev->wq, ttm_bo_delayed_workqueue);
1526         bdev->nice_mode = true;
1527         INIT_LIST_HEAD(&bdev->ddestroy);
1528         bdev->dev_mapping = NULL;
1529         bdev->glob = glob;
1530         bdev->need_dma32 = need_dma32;
1531
1532         mutex_lock(&glob->device_list_mutex);
1533         list_add_tail(&bdev->device_list, &glob->device_list);
1534         mutex_unlock(&glob->device_list_mutex);
1535
1536         return 0;
1537 out_no_addr_mm:
1538         ttm_bo_clean_mm(bdev, 0);
1539 out_no_sys:
1540         return ret;
1541 }
1542 EXPORT_SYMBOL(ttm_bo_device_init);
1543
1544 /*
1545  * buffer object vm functions.
1546  */
1547
1548 bool ttm_mem_reg_is_pci(struct ttm_bo_device *bdev, struct ttm_mem_reg *mem)
1549 {
1550         struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
1551
1552         if (!(man->flags & TTM_MEMTYPE_FLAG_FIXED)) {
1553                 if (mem->mem_type == TTM_PL_SYSTEM)
1554                         return false;
1555
1556                 if (man->flags & TTM_MEMTYPE_FLAG_CMA)
1557                         return false;
1558
1559                 if (mem->placement & TTM_PL_FLAG_CACHED)
1560                         return false;
1561         }
1562         return true;
1563 }
1564
1565 void ttm_bo_unmap_virtual(struct ttm_buffer_object *bo)
1566 {
1567         struct ttm_bo_device *bdev = bo->bdev;
1568         loff_t offset = (loff_t) bo->addr_space_offset;
1569         loff_t holelen = ((loff_t) bo->mem.num_pages) << PAGE_SHIFT;
1570
1571         if (!bdev->dev_mapping)
1572                 return;
1573         unmap_mapping_range(bdev->dev_mapping, offset, holelen, 1);
1574         ttm_mem_io_free(bdev, &bo->mem);
1575 }
1576 EXPORT_SYMBOL(ttm_bo_unmap_virtual);
1577
1578 static void ttm_bo_vm_insert_rb(struct ttm_buffer_object *bo)
1579 {
1580         struct ttm_bo_device *bdev = bo->bdev;
1581         struct rb_node **cur = &bdev->addr_space_rb.rb_node;
1582         struct rb_node *parent = NULL;
1583         struct ttm_buffer_object *cur_bo;
1584         unsigned long offset = bo->vm_node->start;
1585         unsigned long cur_offset;
1586
1587         while (*cur) {
1588                 parent = *cur;
1589                 cur_bo = rb_entry(parent, struct ttm_buffer_object, vm_rb);
1590                 cur_offset = cur_bo->vm_node->start;
1591                 if (offset < cur_offset)
1592                         cur = &parent->rb_left;
1593                 else if (offset > cur_offset)
1594                         cur = &parent->rb_right;
1595                 else
1596                         BUG();
1597         }
1598
1599         rb_link_node(&bo->vm_rb, parent, cur);
1600         rb_insert_color(&bo->vm_rb, &bdev->addr_space_rb);
1601 }
1602
1603 /**
1604  * ttm_bo_setup_vm:
1605  *
1606  * @bo: the buffer to allocate address space for
1607  *
1608  * Allocate address space in the drm device so that applications
1609  * can mmap the buffer and access the contents. This only
1610  * applies to ttm_bo_type_device objects as others are not
1611  * placed in the drm device address space.
1612  */
1613
1614 static int ttm_bo_setup_vm(struct ttm_buffer_object *bo)
1615 {
1616         struct ttm_bo_device *bdev = bo->bdev;
1617         int ret;
1618
1619 retry_pre_get:
1620         ret = drm_mm_pre_get(&bdev->addr_space_mm);
1621         if (unlikely(ret != 0))
1622                 return ret;
1623
1624         write_lock(&bdev->vm_lock);
1625         bo->vm_node = drm_mm_search_free(&bdev->addr_space_mm,
1626                                          bo->mem.num_pages, 0, 0);
1627
1628         if (unlikely(bo->vm_node == NULL)) {
1629                 ret = -ENOMEM;
1630                 goto out_unlock;
1631         }
1632
1633         bo->vm_node = drm_mm_get_block_atomic(bo->vm_node,
1634                                               bo->mem.num_pages, 0);
1635
1636         if (unlikely(bo->vm_node == NULL)) {
1637                 write_unlock(&bdev->vm_lock);
1638                 goto retry_pre_get;
1639         }
1640
1641         ttm_bo_vm_insert_rb(bo);
1642         write_unlock(&bdev->vm_lock);
1643         bo->addr_space_offset = ((uint64_t) bo->vm_node->start) << PAGE_SHIFT;
1644
1645         return 0;
1646 out_unlock:
1647         write_unlock(&bdev->vm_lock);
1648         return ret;
1649 }
1650
1651 int ttm_bo_wait(struct ttm_buffer_object *bo,
1652                 bool lazy, bool interruptible, bool no_wait)
1653 {
1654         struct ttm_bo_driver *driver = bo->bdev->driver;
1655         void *sync_obj;
1656         void *sync_obj_arg;
1657         int ret = 0;
1658
1659         if (likely(bo->sync_obj == NULL))
1660                 return 0;
1661
1662         while (bo->sync_obj) {
1663
1664                 if (driver->sync_obj_signaled(bo->sync_obj, bo->sync_obj_arg)) {
1665                         void *tmp_obj = bo->sync_obj;
1666                         bo->sync_obj = NULL;
1667                         clear_bit(TTM_BO_PRIV_FLAG_MOVING, &bo->priv_flags);
1668                         spin_unlock(&bo->lock);
1669                         driver->sync_obj_unref(&tmp_obj);
1670                         spin_lock(&bo->lock);
1671                         continue;
1672                 }
1673
1674                 if (no_wait)
1675                         return -EBUSY;
1676
1677                 sync_obj = driver->sync_obj_ref(bo->sync_obj);
1678                 sync_obj_arg = bo->sync_obj_arg;
1679                 spin_unlock(&bo->lock);
1680                 ret = driver->sync_obj_wait(sync_obj, sync_obj_arg,
1681                                             lazy, interruptible);
1682                 if (unlikely(ret != 0)) {
1683                         driver->sync_obj_unref(&sync_obj);
1684                         spin_lock(&bo->lock);
1685                         return ret;
1686                 }
1687                 spin_lock(&bo->lock);
1688                 if (likely(bo->sync_obj == sync_obj &&
1689                            bo->sync_obj_arg == sync_obj_arg)) {
1690                         void *tmp_obj = bo->sync_obj;
1691                         bo->sync_obj = NULL;
1692                         clear_bit(TTM_BO_PRIV_FLAG_MOVING,
1693                                   &bo->priv_flags);
1694                         spin_unlock(&bo->lock);
1695                         driver->sync_obj_unref(&sync_obj);
1696                         driver->sync_obj_unref(&tmp_obj);
1697                         spin_lock(&bo->lock);
1698                 } else {
1699                         spin_unlock(&bo->lock);
1700                         driver->sync_obj_unref(&sync_obj);
1701                         spin_lock(&bo->lock);
1702                 }
1703         }
1704         return 0;
1705 }
1706 EXPORT_SYMBOL(ttm_bo_wait);
1707
1708 int ttm_bo_synccpu_write_grab(struct ttm_buffer_object *bo, bool no_wait)
1709 {
1710         int ret = 0;
1711
1712         /*
1713          * Using ttm_bo_reserve makes sure the lru lists are updated.
1714          */
1715
1716         ret = ttm_bo_reserve(bo, true, no_wait, false, 0);
1717         if (unlikely(ret != 0))
1718                 return ret;
1719         spin_lock(&bo->lock);
1720         ret = ttm_bo_wait(bo, false, true, no_wait);
1721         spin_unlock(&bo->lock);
1722         if (likely(ret == 0))
1723                 atomic_inc(&bo->cpu_writers);
1724         ttm_bo_unreserve(bo);
1725         return ret;
1726 }
1727 EXPORT_SYMBOL(ttm_bo_synccpu_write_grab);
1728
1729 void ttm_bo_synccpu_write_release(struct ttm_buffer_object *bo)
1730 {
1731         if (atomic_dec_and_test(&bo->cpu_writers))
1732                 wake_up_all(&bo->event_queue);
1733 }
1734 EXPORT_SYMBOL(ttm_bo_synccpu_write_release);
1735
1736 /**
1737  * A buffer object shrink method that tries to swap out the first
1738  * buffer object on the bo_global::swap_lru list.
1739  */
1740
1741 static int ttm_bo_swapout(struct ttm_mem_shrink *shrink)
1742 {
1743         struct ttm_bo_global *glob =
1744             container_of(shrink, struct ttm_bo_global, shrink);
1745         struct ttm_buffer_object *bo;
1746         int ret = -EBUSY;
1747         int put_count;
1748         uint32_t swap_placement = (TTM_PL_FLAG_CACHED | TTM_PL_FLAG_SYSTEM);
1749
1750         spin_lock(&glob->lru_lock);
1751         while (ret == -EBUSY) {
1752                 if (unlikely(list_empty(&glob->swap_lru))) {
1753                         spin_unlock(&glob->lru_lock);
1754                         return -EBUSY;
1755                 }
1756
1757                 bo = list_first_entry(&glob->swap_lru,
1758                                       struct ttm_buffer_object, swap);
1759                 kref_get(&bo->list_kref);
1760
1761                 if (!list_empty(&bo->ddestroy)) {
1762                         spin_unlock(&glob->lru_lock);
1763                         (void) ttm_bo_cleanup_refs(bo, false, false, false);
1764                         kref_put(&bo->list_kref, ttm_bo_release_list);
1765                         continue;
1766                 }
1767
1768                 /**
1769                  * Reserve buffer. Since we unlock while sleeping, we need
1770                  * to re-check that nobody removed us from the swap-list while
1771                  * we slept.
1772                  */
1773
1774                 ret = ttm_bo_reserve_locked(bo, false, true, false, 0);
1775                 if (unlikely(ret == -EBUSY)) {
1776                         spin_unlock(&glob->lru_lock);
1777                         ttm_bo_wait_unreserved(bo, false);
1778                         kref_put(&bo->list_kref, ttm_bo_release_list);
1779                         spin_lock(&glob->lru_lock);
1780                 }
1781         }
1782
1783         BUG_ON(ret != 0);
1784         put_count = ttm_bo_del_from_lru(bo);
1785         spin_unlock(&glob->lru_lock);
1786
1787         ttm_bo_list_ref_sub(bo, put_count, true);
1788
1789         /**
1790          * Wait for GPU, then move to system cached.
1791          */
1792
1793         spin_lock(&bo->lock);
1794         ret = ttm_bo_wait(bo, false, false, false);
1795         spin_unlock(&bo->lock);
1796
1797         if (unlikely(ret != 0))
1798                 goto out;
1799
1800         if ((bo->mem.placement & swap_placement) != swap_placement) {
1801                 struct ttm_mem_reg evict_mem;
1802
1803                 evict_mem = bo->mem;
1804                 evict_mem.mm_node = NULL;
1805                 evict_mem.placement = TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED;
1806                 evict_mem.mem_type = TTM_PL_SYSTEM;
1807
1808                 ret = ttm_bo_handle_move_mem(bo, &evict_mem, true,
1809                                              false, false, false);
1810                 if (unlikely(ret != 0))
1811                         goto out;
1812         }
1813
1814         ttm_bo_unmap_virtual(bo);
1815
1816         /**
1817          * Swap out. Buffer will be swapped in again as soon as
1818          * anyone tries to access a ttm page.
1819          */
1820
1821         if (bo->bdev->driver->swap_notify)
1822                 bo->bdev->driver->swap_notify(bo);
1823
1824         ret = ttm_tt_swapout(bo->ttm, bo->persistant_swap_storage);
1825 out:
1826
1827         /**
1828          *
1829          * Unreserve without putting on LRU to avoid swapping out an
1830          * already swapped buffer.
1831          */
1832
1833         atomic_set(&bo->reserved, 0);
1834         wake_up_all(&bo->event_queue);
1835         kref_put(&bo->list_kref, ttm_bo_release_list);
1836         return ret;
1837 }
1838
1839 void ttm_bo_swapout_all(struct ttm_bo_device *bdev)
1840 {
1841         while (ttm_bo_swapout(&bdev->glob->shrink) == 0)
1842                 ;
1843 }
1844 EXPORT_SYMBOL(ttm_bo_swapout_all);