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 int ttm_bo_swapout(struct ttm_mem_shrink *shrink);
  47 static void ttm_bo_global_kobj_release(struct kobject *kobj);
  48
  49 static struct attribute ttm_bo_count = {
  50         .name = "bo_count",
  51         .mode = S_IRUGO
  52 };
  53
  54 static inline int ttm_mem_type_from_flags(uint32_t flags, uint32_t *mem_type)
  55 {
  56         int i;
  57
  58         for (i = 0; i <= TTM_PL_PRIV5; i++)
  59                 if (flags & (1 << i)) {
  60                         *mem_type = i;
  61                         return 0;
  62                 }
  63         return -EINVAL;
  64 }
  65
  66 static void ttm_mem_type_debug(struct ttm_bo_device *bdev, int mem_type)
  67 {
  68         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
  69
  70         printk(KERN_ERR TTM_PFX "    has_type: %d\n", man->has_type);
  71         printk(KERN_ERR TTM_PFX "    use_type: %d\n", man->use_type);
  72         printk(KERN_ERR TTM_PFX "    flags: 0x%08X\n", man->flags);
  73         printk(KERN_ERR TTM_PFX "    gpu_offset: 0x%08lX\n", man->gpu_offset);
  74         printk(KERN_ERR TTM_PFX "    size: %llu\n", man->size);
  75         printk(KERN_ERR TTM_PFX "    available_caching: 0x%08X\n",
  76                 man->available_caching);
  77         printk(KERN_ERR TTM_PFX "    default_caching: 0x%08X\n",
  78                 man->default_caching);
  79         if (mem_type != TTM_PL_SYSTEM)
  80                 (*man->func->debug)(man, TTM_PFX);
  81 }
  82
  83 static void ttm_bo_mem_space_debug(struct ttm_buffer_object *bo,
  84                                         struct ttm_placement *placement)
  85 {
  86         int i, ret, mem_type;
  87
  88         printk(KERN_ERR TTM_PFX "No space for %p (%lu pages, %luK, %luM)\n",
  89                 bo, bo->mem.num_pages, bo->mem.size >> 10,
  90                 bo->mem.size >> 20);
  91         for (i = 0; i < placement->num_placement; i++) {
  92                 ret = ttm_mem_type_from_flags(placement->placement[i],
  93                                                 &mem_type);
  94                 if (ret)
  95                         return;
  96                 printk(KERN_ERR TTM_PFX "  placement[%d]=0x%08X (%d)\n",
  97                         i, placement->placement[i], mem_type);
  98                 ttm_mem_type_debug(bo->bdev, mem_type);
  99         }
 100 }
 101
 102 static ssize_t ttm_bo_global_show(struct kobject *kobj,
 103                                   struct attribute *attr,
 104                                   char *buffer)
 105 {
 106         struct ttm_bo_global *glob =
 107                 container_of(kobj, struct ttm_bo_global, kobj);
 108
 109         return snprintf(buffer, PAGE_SIZE, "%lu\n",
 110                         (unsigned long) atomic_read(&glob->bo_count));
 111 }
 112
 113 static struct attribute *ttm_bo_global_attrs[] = {
 114         &ttm_bo_count,
 115         NULL
 116 };
 117
 118 static const struct sysfs_ops ttm_bo_global_ops = {
 119         .show = &ttm_bo_global_show
 120 };
 121
 122 static struct kobj_type ttm_bo_glob_kobj_type  = {
 123         .release = &ttm_bo_global_kobj_release,
 124         .sysfs_ops = &ttm_bo_global_ops,
 125         .default_attrs = ttm_bo_global_attrs
 126 };
 127
 128
 129 static inline uint32_t ttm_bo_type_flags(unsigned type)
 130 {
 131         return 1 << (type);
 132 }
 133
 134 static void ttm_bo_release_list(struct kref *list_kref)
 135 {
 136         struct ttm_buffer_object *bo =
 137             container_of(list_kref, struct ttm_buffer_object, list_kref);
 138         struct ttm_bo_device *bdev = bo->bdev;
 139
 140         BUG_ON(atomic_read(&bo->list_kref.refcount));
 141         BUG_ON(atomic_read(&bo->kref.refcount));
 142         BUG_ON(atomic_read(&bo->cpu_writers));
 143         BUG_ON(bo->sync_obj != NULL);
 144         BUG_ON(bo->mem.mm_node != NULL);
 145         BUG_ON(!list_empty(&bo->lru));
 146         BUG_ON(!list_empty(&bo->ddestroy));
 147
 148         if (bo->ttm)
 149                 ttm_tt_destroy(bo->ttm);
 150         atomic_dec(&bo->glob->bo_count);
 151         if (bo->destroy)
 152                 bo->destroy(bo);
 153         else {
 154                 ttm_mem_global_free(bdev->glob->mem_glob, bo->acc_size);
 155                 kfree(bo);
 156         }
 157 }
 158
 159 int ttm_bo_wait_unreserved(struct ttm_buffer_object *bo, bool interruptible)
 160 {
 161         if (interruptible) {
 162                 return wait_event_interruptible(bo->event_queue,
 163                                                atomic_read(&bo->reserved) == 0);
 164         } else {
 165                 wait_event(bo->event_queue, atomic_read(&bo->reserved) == 0);
 166                 return 0;
 167         }
 168 }
 169 EXPORT_SYMBOL(ttm_bo_wait_unreserved);
 170
 171 static void ttm_bo_add_to_lru(struct ttm_buffer_object *bo)
 172 {
 173         struct ttm_bo_device *bdev = bo->bdev;
 174         struct ttm_mem_type_manager *man;
 175
 176         BUG_ON(!atomic_read(&bo->reserved));
 177
 178         if (!(bo->mem.placement & TTM_PL_FLAG_NO_EVICT)) {
 179
 180                 BUG_ON(!list_empty(&bo->lru));
 181
 182                 man = &bdev->man[bo->mem.mem_type];
 183                 list_add_tail(&bo->lru, &man->lru);
 184                 kref_get(&bo->list_kref);
 185
 186                 if (bo->ttm != NULL) {
 187                         list_add_tail(&bo->swap, &bo->glob->swap_lru);
 188                         kref_get(&bo->list_kref);
 189                 }
 190         }
 191 }
 192
 193 /**
 194  * Call with the lru_lock held.
 195  */
 196
 197 static int ttm_bo_del_from_lru(struct ttm_buffer_object *bo)
 198 {
 199         int put_count = 0;
 200
 201         if (!list_empty(&bo->swap)) {
 202                 list_del_init(&bo->swap);
 203                 ++put_count;
 204         }
 205         if (!list_empty(&bo->lru)) {
 206                 list_del_init(&bo->lru);
 207                 ++put_count;
 208         }
 209
 210         /*
 211          * TODO: Add a driver hook to delete from
 212          * driver-specific LRU's here.
 213          */
 214
 215         return put_count;
 216 }
 217
 218 int ttm_bo_reserve_locked(struct ttm_buffer_object *bo,
 219                           bool interruptible,
 220                           bool no_wait, bool use_sequence, uint32_t sequence)
 221 {
 222         struct ttm_bo_global *glob = bo->glob;
 223         int ret;
 224
 225         while (unlikely(atomic_cmpxchg(&bo->reserved, 0, 1) != 0)) {
 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                 bo->val_seq = sequence;
 244                 bo->seq_valid = true;
 245         } else {
 246                 bo->seq_valid = false;
 247         }
 248
 249         return 0;
 250 }
 251 EXPORT_SYMBOL(ttm_bo_reserve);
 252
 253 static void ttm_bo_ref_bug(struct kref *list_kref)
 254 {
 255         BUG();
 256 }
 257
 258 int ttm_bo_reserve(struct ttm_buffer_object *bo,
 259                    bool interruptible,
 260                    bool no_wait, bool use_sequence, uint32_t sequence)
 261 {
 262         struct ttm_bo_global *glob = bo->glob;
 263         int put_count = 0;
 264         int ret;
 265
 266         spin_lock(&glob->lru_lock);
 267         ret = ttm_bo_reserve_locked(bo, interruptible, no_wait, use_sequence,
 268                                     sequence);
 269         if (likely(ret == 0))
 270                 put_count = ttm_bo_del_from_lru(bo);
 271         spin_unlock(&glob->lru_lock);
 272
 273         while (put_count--)
 274                 kref_put(&bo->list_kref, ttm_bo_ref_bug);
 275
 276         return ret;
 277 }
 278
 279 void ttm_bo_unreserve(struct ttm_buffer_object *bo)
 280 {
 281         struct ttm_bo_global *glob = bo->glob;
 282
 283         spin_lock(&glob->lru_lock);
 284         ttm_bo_add_to_lru(bo);
 285         atomic_set(&bo->reserved, 0);
 286         wake_up_all(&bo->event_queue);
 287         spin_unlock(&glob->lru_lock);
 288 }
 289 EXPORT_SYMBOL(ttm_bo_unreserve);
 290
 291 /*
 292  * Call bo->mutex locked.
 293  */
 294 static int ttm_bo_add_ttm(struct ttm_buffer_object *bo, bool zero_alloc)
 295 {
 296         struct ttm_bo_device *bdev = bo->bdev;
 297         struct ttm_bo_global *glob = bo->glob;
 298         int ret = 0;
 299         uint32_t page_flags = 0;
 300
 301         TTM_ASSERT_LOCKED(&bo->mutex);
 302         bo->ttm = NULL;
 303
 304         if (bdev->need_dma32)
 305                 page_flags |= TTM_PAGE_FLAG_DMA32;
 306
 307         switch (bo->type) {
 308         case ttm_bo_type_device:
 309                 if (zero_alloc)
 310                         page_flags |= TTM_PAGE_FLAG_ZERO_ALLOC;
 311         case ttm_bo_type_kernel:
 312                 bo->ttm = ttm_tt_create(bdev, bo->num_pages << PAGE_SHIFT,
 313                                         page_flags, glob->dummy_read_page);
 314                 if (unlikely(bo->ttm == NULL))
 315                         ret = -ENOMEM;
 316                 break;
 317         case ttm_bo_type_user:
 318                 bo->ttm = ttm_tt_create(bdev, bo->num_pages << PAGE_SHIFT,
 319                                         page_flags | TTM_PAGE_FLAG_USER,
 320                                         glob->dummy_read_page);
 321                 if (unlikely(bo->ttm == NULL)) {
 322                         ret = -ENOMEM;
 323                         break;
 324                 }
 325
 326                 ret = ttm_tt_set_user(bo->ttm, current,
 327                                       bo->buffer_start, bo->num_pages);
 328                 if (unlikely(ret != 0))
 329                         ttm_tt_destroy(bo->ttm);
 330                 break;
 331         default:
 332                 printk(KERN_ERR TTM_PFX "Illegal buffer object type\n");
 333                 ret = -EINVAL;
 334                 break;
 335         }
 336
 337         return ret;
 338 }
 339
 340 static int ttm_bo_handle_move_mem(struct ttm_buffer_object *bo,
 341                                   struct ttm_mem_reg *mem,
 342                                   bool evict, bool interruptible,
 343                                   bool no_wait_reserve, bool no_wait_gpu)
 344 {
 345         struct ttm_bo_device *bdev = bo->bdev;
 346         bool old_is_pci = ttm_mem_reg_is_pci(bdev, &bo->mem);
 347         bool new_is_pci = ttm_mem_reg_is_pci(bdev, mem);
 348         struct ttm_mem_type_manager *old_man = &bdev->man[bo->mem.mem_type];
 349         struct ttm_mem_type_manager *new_man = &bdev->man[mem->mem_type];
 350         int ret = 0;
 351
 352         if (old_is_pci || new_is_pci ||
 353             ((mem->placement & bo->mem.placement & TTM_PL_MASK_CACHING) == 0))
 354                 ttm_bo_unmap_virtual(bo);
 355
 356         /*
 357          * Create and bind a ttm if required.
 358          */
 359
 360         if (!(new_man->flags & TTM_MEMTYPE_FLAG_FIXED) && (bo->ttm == NULL)) {
 361                 ret = ttm_bo_add_ttm(bo, false);
 362                 if (ret)
 363                         goto out_err;
 364
 365                 ret = ttm_tt_set_placement_caching(bo->ttm, mem->placement);
 366                 if (ret)
 367                         goto out_err;
 368
 369                 if (mem->mem_type != TTM_PL_SYSTEM) {
 370                         ret = ttm_tt_bind(bo->ttm, mem);
 371                         if (ret)
 372                                 goto out_err;
 373                 }
 374
 375                 if (bo->mem.mem_type == TTM_PL_SYSTEM) {
 376                         bo->mem = *mem;
 377                         mem->mm_node = NULL;
 378                         goto moved;
 379                 }
 380
 381         }
 382
 383         if (bdev->driver->move_notify)
 384                 bdev->driver->move_notify(bo, mem);
 385
 386         if (!(old_man->flags & TTM_MEMTYPE_FLAG_FIXED) &&
 387             !(new_man->flags & TTM_MEMTYPE_FLAG_FIXED))
 388                 ret = ttm_bo_move_ttm(bo, evict, no_wait_reserve, no_wait_gpu, mem);
 389         else if (bdev->driver->move)
 390                 ret = bdev->driver->move(bo, evict, interruptible,
 391                                          no_wait_reserve, no_wait_gpu, mem);
 392         else
 393                 ret = ttm_bo_move_memcpy(bo, evict, no_wait_reserve, no_wait_gpu, mem);
 394
 395         if (ret)
 396                 goto out_err;
 397
 398 moved:
 399         if (bo->evicted) {
 400                 ret = bdev->driver->invalidate_caches(bdev, bo->mem.placement);
 401                 if (ret)
 402                         printk(KERN_ERR TTM_PFX "Can not flush read caches\n");
 403                 bo->evicted = false;
 404         }
 405
 406         if (bo->mem.mm_node) {
 407                 spin_lock(&bo->lock);
 408                 bo->offset = (bo->mem.start << PAGE_SHIFT) +
 409                     bdev->man[bo->mem.mem_type].gpu_offset;
 410                 bo->cur_placement = bo->mem.placement;
 411                 spin_unlock(&bo->lock);
 412         } else
 413                 bo->offset = 0;
 414
 415         return 0;
 416
 417 out_err:
 418         new_man = &bdev->man[bo->mem.mem_type];
 419         if ((new_man->flags & TTM_MEMTYPE_FLAG_FIXED) && bo->ttm) {
 420                 ttm_tt_unbind(bo->ttm);
 421                 ttm_tt_destroy(bo->ttm);
 422                 bo->ttm = NULL;
 423         }
 424
 425         return ret;
 426 }
 427
 428 /**
 429  * Call bo::reserved.
 430  * Will release GPU memory type usage on destruction.
 431  * This is the place to put in driver specific hooks to release
 432  * driver private resources.
 433  * Will release the bo::reserved lock.
 434  */
 435
 436 static void ttm_bo_cleanup_memtype_use(struct ttm_buffer_object *bo)
 437 {
 438         if (bo->ttm) {
 439                 ttm_tt_unbind(bo->ttm);
 440                 ttm_tt_destroy(bo->ttm);
 441                 bo->ttm = NULL;
 442         }
 443
 444         ttm_bo_mem_put(bo, &bo->mem);
 445
 446         atomic_set(&bo->reserved, 0);
 447         wake_up_all(&bo->event_queue);
 448 }
 449
 450 static void ttm_bo_cleanup_refs_or_queue(struct ttm_buffer_object *bo)
 451 {
 452         struct ttm_bo_device *bdev = bo->bdev;
 453         struct ttm_bo_global *glob = bo->glob;
 454         struct ttm_bo_driver *driver;
 455         void *sync_obj;
 456         void *sync_obj_arg;
 457         int put_count;
 458         int ret;
 459
 460         spin_lock(&bo->lock);
 461         (void) ttm_bo_wait(bo, false, false, true);
 462         if (!bo->sync_obj) {
 463
 464                 spin_lock(&glob->lru_lock);
 465
 466                 /**
 467                  * Lock inversion between bo::reserve and bo::lock here,
 468                  * but that's OK, since we're only trylocking.
 469                  */
 470
 471                 ret = ttm_bo_reserve_locked(bo, false, true, false, 0);
 472
 473                 if (unlikely(ret == -EBUSY))
 474                         goto queue;
 475
 476                 spin_unlock(&bo->lock);
 477                 put_count = ttm_bo_del_from_lru(bo);
 478
 479                 spin_unlock(&glob->lru_lock);
 480                 ttm_bo_cleanup_memtype_use(bo);
 481
 482                 while (put_count--)
 483                         kref_put(&bo->list_kref, ttm_bo_ref_bug);
 484
 485                 return;
 486         } else {
 487                 spin_lock(&glob->lru_lock);
 488         }
 489 queue:
 490         sync_obj = bo->sync_obj;
 491         sync_obj_arg = bo->sync_obj_arg;
 492         driver = bdev->driver;
 493
 494         kref_get(&bo->list_kref);
 495         list_add_tail(&bo->ddestroy, &bdev->ddestroy);
 496         spin_unlock(&glob->lru_lock);
 497         spin_unlock(&bo->lock);
 498
 499         if (sync_obj)
 500                 driver->sync_obj_flush(sync_obj, sync_obj_arg);
 501         schedule_delayed_work(&bdev->wq,
 502                               ((HZ / 100) < 1) ? 1 : HZ / 100);
 503 }
 504
 505 /**
 506  * function ttm_bo_cleanup_refs
 507  * If bo idle, remove from delayed- and lru lists, and unref.
 508  * If not idle, do nothing.
 509  *
 510  * @interruptible         Any sleeps should occur interruptibly.
 511  * @no_wait_reserve       Never wait for reserve. Return -EBUSY instead.
 512  * @no_wait_gpu           Never wait for gpu. Return -EBUSY instead.
 513  */
 514
 515 static int ttm_bo_cleanup_refs(struct ttm_buffer_object *bo,
 516                                bool interruptible,
 517                                bool no_wait_reserve,
 518                                bool no_wait_gpu)
 519 {
 520         struct ttm_bo_global *glob = bo->glob;
 521         int put_count;
 522         int ret = 0;
 523
 524 retry:
 525         spin_lock(&bo->lock);
 526         ret = ttm_bo_wait(bo, false, interruptible, no_wait_gpu);
 527         spin_unlock(&bo->lock);
 528
 529         if (unlikely(ret != 0))
 530                 return ret;
 531
 532         spin_lock(&glob->lru_lock);
 533         ret = ttm_bo_reserve_locked(bo, interruptible,
 534                                     no_wait_reserve, false, 0);
 535
 536         if (unlikely(ret != 0) || list_empty(&bo->ddestroy)) {
 537                 spin_unlock(&glob->lru_lock);
 538                 return ret;
 539         }
 540
 541         /**
 542          * We can re-check for sync object without taking
 543          * the bo::lock since setting the sync object requires
 544          * also bo::reserved. A busy object at this point may
 545          * be caused by another thread recently starting an accelerated
 546          * eviction.
 547          */
 548
 549         if (unlikely(bo->sync_obj)) {
 550                 atomic_set(&bo->reserved, 0);
 551                 wake_up_all(&bo->event_queue);
 552                 spin_unlock(&glob->lru_lock);
 553                 goto retry;
 554         }
 555
 556         put_count = ttm_bo_del_from_lru(bo);
 557         list_del_init(&bo->ddestroy);
 558         ++put_count;
 559
 560         spin_unlock(&glob->lru_lock);
 561         ttm_bo_cleanup_memtype_use(bo);
 562
 563         while (put_count--)
 564                 kref_put(&bo->list_kref, ttm_bo_ref_bug);
 565
 566         return 0;
 567 }
 568
 569 /**
 570  * Traverse the delayed list, and call ttm_bo_cleanup_refs on all
 571  * encountered buffers.
 572  */
 573
 574 static int ttm_bo_delayed_delete(struct ttm_bo_device *bdev, bool remove_all)
 575 {
 576         struct ttm_bo_global *glob = bdev->glob;
 577         struct ttm_buffer_object *entry = NULL;
 578         int ret = 0;
 579
 580         spin_lock(&glob->lru_lock);
 581         if (list_empty(&bdev->ddestroy))
 582                 goto out_unlock;
 583
 584         entry = list_first_entry(&bdev->ddestroy,
 585                 struct ttm_buffer_object, ddestroy);
 586         kref_get(&entry->list_kref);
 587
 588         for (;;) {
 589                 struct ttm_buffer_object *nentry = NULL;
 590
 591                 if (entry->ddestroy.next != &bdev->ddestroy) {
 592                         nentry = list_first_entry(&entry->ddestroy,
 593                                 struct ttm_buffer_object, ddestroy);
 594                         kref_get(&nentry->list_kref);
 595                 }
 596
 597                 spin_unlock(&glob->lru_lock);
 598                 ret = ttm_bo_cleanup_refs(entry, false, !remove_all,
 599                                           !remove_all);
 600                 kref_put(&entry->list_kref, ttm_bo_release_list);
 601                 entry = nentry;
 602
 603                 if (ret || !entry)
 604                         goto out;
 605
 606                 spin_lock(&glob->lru_lock);
 607                 if (list_empty(&entry->ddestroy))
 608                         break;
 609         }
 610
 611 out_unlock:
 612         spin_unlock(&glob->lru_lock);
 613 out:
 614         if (entry)
 615                 kref_put(&entry->list_kref, ttm_bo_release_list);
 616         return ret;
 617 }
 618
 619 static void ttm_bo_delayed_workqueue(struct work_struct *work)
 620 {
 621         struct ttm_bo_device *bdev =
 622             container_of(work, struct ttm_bo_device, wq.work);
 623
 624         if (ttm_bo_delayed_delete(bdev, false)) {
 625                 schedule_delayed_work(&bdev->wq,
 626                                       ((HZ / 100) < 1) ? 1 : HZ / 100);
 627         }
 628 }
 629
 630 static void ttm_bo_release(struct kref *kref)
 631 {
 632         struct ttm_buffer_object *bo =
 633             container_of(kref, struct ttm_buffer_object, kref);
 634         struct ttm_bo_device *bdev = bo->bdev;
 635
 636         if (likely(bo->vm_node != NULL)) {
 637                 rb_erase(&bo->vm_rb, &bdev->addr_space_rb);
 638                 drm_mm_put_block(bo->vm_node);
 639                 bo->vm_node = NULL;
 640         }
 641         write_unlock(&bdev->vm_lock);
 642         ttm_bo_cleanup_refs_or_queue(bo);
 643         kref_put(&bo->list_kref, ttm_bo_release_list);
 644         write_lock(&bdev->vm_lock);
 645 }
 646
 647 void ttm_bo_unref(struct ttm_buffer_object **p_bo)
 648 {
 649         struct ttm_buffer_object *bo = *p_bo;
 650         struct ttm_bo_device *bdev = bo->bdev;
 651
 652         *p_bo = NULL;
 653         write_lock(&bdev->vm_lock);
 654         kref_put(&bo->kref, ttm_bo_release);
 655         write_unlock(&bdev->vm_lock);
 656 }
 657 EXPORT_SYMBOL(ttm_bo_unref);
 658
 659 int ttm_bo_lock_delayed_workqueue(struct ttm_bo_device *bdev)
 660 {
 661         return cancel_delayed_work_sync(&bdev->wq);
 662 }
 663 EXPORT_SYMBOL(ttm_bo_lock_delayed_workqueue);
 664
 665 void ttm_bo_unlock_delayed_workqueue(struct ttm_bo_device *bdev, int resched)
 666 {
 667         if (resched)
 668                 schedule_delayed_work(&bdev->wq,
 669                                       ((HZ / 100) < 1) ? 1 : HZ / 100);
 670 }
 671 EXPORT_SYMBOL(ttm_bo_unlock_delayed_workqueue);
 672
 673 static int ttm_bo_evict(struct ttm_buffer_object *bo, bool interruptible,
 674                         bool no_wait_reserve, bool no_wait_gpu)
 675 {
 676         struct ttm_bo_device *bdev = bo->bdev;
 677         struct ttm_mem_reg evict_mem;
 678         struct ttm_placement placement;
 679         int ret = 0;
 680
 681         spin_lock(&bo->lock);
 682         ret = ttm_bo_wait(bo, false, interruptible, no_wait_gpu);
 683         spin_unlock(&bo->lock);
 684
 685         if (unlikely(ret != 0)) {
 686                 if (ret != -ERESTARTSYS) {
 687                         printk(KERN_ERR TTM_PFX
 688                                "Failed to expire sync object before "
 689                                "buffer eviction.\n");
 690                 }
 691                 goto out;
 692         }
 693
 694         BUG_ON(!atomic_read(&bo->reserved));
 695
 696         evict_mem = bo->mem;
 697         evict_mem.mm_node = NULL;
 698         evict_mem.bus.io_reserved = false;
 699
 700         placement.fpfn = 0;
 701         placement.lpfn = 0;
 702         placement.num_placement = 0;
 703         placement.num_busy_placement = 0;
 704         bdev->driver->evict_flags(bo, &placement);
 705         ret = ttm_bo_mem_space(bo, &placement, &evict_mem, interruptible,
 706                                 no_wait_reserve, no_wait_gpu);
 707         if (ret) {
 708                 if (ret != -ERESTARTSYS) {
 709                         printk(KERN_ERR TTM_PFX
 710                                "Failed to find memory space for "
 711                                "buffer 0x%p eviction.\n", bo);
 712                         ttm_bo_mem_space_debug(bo, &placement);
 713                 }
 714                 goto out;
 715         }
 716
 717         ret = ttm_bo_handle_move_mem(bo, &evict_mem, true, interruptible,
 718                                      no_wait_reserve, no_wait_gpu);
 719         if (ret) {
 720                 if (ret != -ERESTARTSYS)
 721                         printk(KERN_ERR TTM_PFX "Buffer eviction failed\n");
 722                 ttm_bo_mem_put(bo, &evict_mem);
 723                 goto out;
 724         }
 725         bo->evicted = true;
 726 out:
 727         return ret;
 728 }
 729
 730 static int ttm_mem_evict_first(struct ttm_bo_device *bdev,
 731                                 uint32_t mem_type,
 732                                 bool interruptible, bool no_wait_reserve,
 733                                 bool no_wait_gpu)
 734 {
 735         struct ttm_bo_global *glob = bdev->glob;
 736         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
 737         struct ttm_buffer_object *bo;
 738         int ret, put_count = 0;
 739
 740 retry:
 741         spin_lock(&glob->lru_lock);
 742         if (list_empty(&man->lru)) {
 743                 spin_unlock(&glob->lru_lock);
 744                 return -EBUSY;
 745         }
 746
 747         bo = list_first_entry(&man->lru, struct ttm_buffer_object, lru);
 748         kref_get(&bo->list_kref);
 749
 750         if (!list_empty(&bo->ddestroy)) {
 751                 spin_unlock(&glob->lru_lock);
 752                 ret = ttm_bo_cleanup_refs(bo, interruptible,
 753                                           no_wait_reserve, no_wait_gpu);
 754                 kref_put(&bo->list_kref, ttm_bo_release_list);
 755
 756                 if (likely(ret == 0 || ret == -ERESTARTSYS))
 757                         return ret;
 758
 759                 goto retry;
 760         }
 761
 762         ret = ttm_bo_reserve_locked(bo, false, no_wait_reserve, false, 0);
 763
 764         if (unlikely(ret == -EBUSY)) {
 765                 spin_unlock(&glob->lru_lock);
 766                 if (likely(!no_wait_gpu))
 767                         ret = ttm_bo_wait_unreserved(bo, interruptible);
 768
 769                 kref_put(&bo->list_kref, ttm_bo_release_list);
 770
 771                 /**
 772                  * We *need* to retry after releasing the lru lock.
 773                  */
 774
 775                 if (unlikely(ret != 0))
 776                         return ret;
 777                 goto retry;
 778         }
 779
 780         put_count = ttm_bo_del_from_lru(bo);
 781         spin_unlock(&glob->lru_lock);
 782
 783         BUG_ON(ret != 0);
 784
 785         while (put_count--)
 786                 kref_put(&bo->list_kref, ttm_bo_ref_bug);
 787
 788         ret = ttm_bo_evict(bo, interruptible, no_wait_reserve, no_wait_gpu);
 789         ttm_bo_unreserve(bo);
 790
 791         kref_put(&bo->list_kref, ttm_bo_release_list);
 792         return ret;
 793 }
 794
 795 void ttm_bo_mem_put(struct ttm_buffer_object *bo, struct ttm_mem_reg *mem)
 796 {
 797         struct ttm_mem_type_manager *man = &bo->bdev->man[mem->mem_type];
 798
 799         if (mem->mm_node)
 800                 (*man->func->put_node)(man, mem);
 801 }
 802 EXPORT_SYMBOL(ttm_bo_mem_put);
 803
 804 /**
 805  * Repeatedly evict memory from the LRU for @mem_type until we create enough
 806  * space, or we've evicted everything and there isn't enough space.
 807  */
 808 static int ttm_bo_mem_force_space(struct ttm_buffer_object *bo,
 809                                         uint32_t mem_type,
 810                                         struct ttm_placement *placement,
 811                                         struct ttm_mem_reg *mem,
 812                                         bool interruptible,
 813                                         bool no_wait_reserve,
 814                                         bool no_wait_gpu)
 815 {
 816         struct ttm_bo_device *bdev = bo->bdev;
 817         struct ttm_bo_global *glob = bdev->glob;
 818         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
 819         int ret;
 820
 821         do {
 822                 ret = (*man->func->get_node)(man, bo, placement, mem);
 823                 if (unlikely(ret != 0))
 824                         return ret;
 825                 if (mem->mm_node)
 826                         break;
 827                 spin_lock(&glob->lru_lock);
 828                 if (list_empty(&man->lru)) {
 829                         spin_unlock(&glob->lru_lock);
 830                         break;
 831                 }
 832                 spin_unlock(&glob->lru_lock);
 833                 ret = ttm_mem_evict_first(bdev, mem_type, interruptible,
 834                                                 no_wait_reserve, no_wait_gpu);
 835                 if (unlikely(ret != 0))
 836                         return ret;
 837         } while (1);
 838         if (mem->mm_node == NULL)
 839                 return -ENOMEM;
 840         mem->mem_type = mem_type;
 841         return 0;
 842 }
 843
 844 static uint32_t ttm_bo_select_caching(struct ttm_mem_type_manager *man,
 845                                       uint32_t cur_placement,
 846                                       uint32_t proposed_placement)
 847 {
 848         uint32_t caching = proposed_placement & TTM_PL_MASK_CACHING;
 849         uint32_t result = proposed_placement & ~TTM_PL_MASK_CACHING;
 850
 851         /**
 852          * Keep current caching if possible.
 853          */
 854
 855         if ((cur_placement & caching) != 0)
 856                 result |= (cur_placement & caching);
 857         else if ((man->default_caching & caching) != 0)
 858                 result |= man->default_caching;
 859         else if ((TTM_PL_FLAG_CACHED & caching) != 0)
 860                 result |= TTM_PL_FLAG_CACHED;
 861         else if ((TTM_PL_FLAG_WC & caching) != 0)
 862                 result |= TTM_PL_FLAG_WC;
 863         else if ((TTM_PL_FLAG_UNCACHED & caching) != 0)
 864                 result |= TTM_PL_FLAG_UNCACHED;
 865
 866         return result;
 867 }
 868
 869 static bool ttm_bo_mt_compatible(struct ttm_mem_type_manager *man,
 870                                  bool disallow_fixed,
 871                                  uint32_t mem_type,
 872                                  uint32_t proposed_placement,
 873                                  uint32_t *masked_placement)
 874 {
 875         uint32_t cur_flags = ttm_bo_type_flags(mem_type);
 876
 877         if ((man->flags & TTM_MEMTYPE_FLAG_FIXED) && disallow_fixed)
 878                 return false;
 879
 880         if ((cur_flags & proposed_placement & TTM_PL_MASK_MEM) == 0)
 881                 return false;
 882
 883         if ((proposed_placement & man->available_caching) == 0)
 884                 return false;
 885
 886         cur_flags |= (proposed_placement & man->available_caching);
 887
 888         *masked_placement = cur_flags;
 889         return true;
 890 }
 891
 892 /**
 893  * Creates space for memory region @mem according to its type.
 894  *
 895  * This function first searches for free space in compatible memory types in
 896  * the priority order defined by the driver.  If free space isn't found, then
 897  * ttm_bo_mem_force_space is attempted in priority order to evict and find
 898  * space.
 899  */
 900 int ttm_bo_mem_space(struct ttm_buffer_object *bo,
 901                         struct ttm_placement *placement,
 902                         struct ttm_mem_reg *mem,
 903                         bool interruptible, bool no_wait_reserve,
 904                         bool no_wait_gpu)
 905 {
 906         struct ttm_bo_device *bdev = bo->bdev;
 907         struct ttm_mem_type_manager *man;
 908         uint32_t mem_type = TTM_PL_SYSTEM;
 909         uint32_t cur_flags = 0;
 910         bool type_found = false;
 911         bool type_ok = false;
 912         bool has_erestartsys = false;
 913         int i, ret;
 914
 915         mem->mm_node = NULL;
 916         for (i = 0; i < placement->num_placement; ++i) {
 917                 ret = ttm_mem_type_from_flags(placement->placement[i],
 918                                                 &mem_type);
 919                 if (ret)
 920                         return ret;
 921                 man = &bdev->man[mem_type];
 922
 923                 type_ok = ttm_bo_mt_compatible(man,
 924                                                 bo->type == ttm_bo_type_user,
 925                                                 mem_type,
 926                                                 placement->placement[i],
 927                                                 &cur_flags);
 928
 929                 if (!type_ok)
 930                         continue;
 931
 932                 cur_flags = ttm_bo_select_caching(man, bo->mem.placement,
 933                                                   cur_flags);
 934                 /*
 935                  * Use the access and other non-mapping-related flag bits from
 936                  * the memory placement flags to the current flags
 937                  */
 938                 ttm_flag_masked(&cur_flags, placement->placement[i],
 939                                 ~TTM_PL_MASK_MEMTYPE);
 940
 941                 if (mem_type == TTM_PL_SYSTEM)
 942                         break;
 943
 944                 if (man->has_type && man->use_type) {
 945                         type_found = true;
 946                         ret = (*man->func->get_node)(man, bo, placement, mem);
 947                         if (unlikely(ret))
 948                                 return ret;
 949                 }
 950                 if (mem->mm_node)
 951                         break;
 952         }
 953
 954         if ((type_ok && (mem_type == TTM_PL_SYSTEM)) || mem->mm_node) {
 955                 mem->mem_type = mem_type;
 956                 mem->placement = cur_flags;
 957                 return 0;
 958         }
 959
 960         if (!type_found)
 961                 return -EINVAL;
 962
 963         for (i = 0; i < placement->num_busy_placement; ++i) {
 964                 ret = ttm_mem_type_from_flags(placement->busy_placement[i],
 965                                                 &mem_type);
 966                 if (ret)
 967                         return ret;
 968                 man = &bdev->man[mem_type];
 969                 if (!man->has_type)
 970                         continue;
 971                 if (!ttm_bo_mt_compatible(man,
 972                                                 bo->type == ttm_bo_type_user,
 973                                                 mem_type,
 974                                                 placement->busy_placement[i],
 975                                                 &cur_flags))
 976                         continue;
 977
 978                 cur_flags = ttm_bo_select_caching(man, bo->mem.placement,
 979                                                   cur_flags);
 980                 /*
 981                  * Use the access and other non-mapping-related flag bits from
 982                  * the memory placement flags to the current flags
 983                  */
 984                 ttm_flag_masked(&cur_flags, placement->busy_placement[i],
 985                                 ~TTM_PL_MASK_MEMTYPE);
 986
 987
 988                 if (mem_type == TTM_PL_SYSTEM) {
 989                         mem->mem_type = mem_type;
 990                         mem->placement = cur_flags;
 991                         mem->mm_node = NULL;
 992                         return 0;
 993                 }
 994
 995                 ret = ttm_bo_mem_force_space(bo, mem_type, placement, mem,
 996                                                 interruptible, no_wait_reserve, no_wait_gpu);
 997                 if (ret == 0 && mem->mm_node) {
 998                         mem->placement = cur_flags;
 999                         return 0;
1000                 }
1001                 if (ret == -ERESTARTSYS)
1002                         has_erestartsys = true;
1003         }
1004         ret = (has_erestartsys) ? -ERESTARTSYS : -ENOMEM;
1005         return ret;
1006 }
1007 EXPORT_SYMBOL(ttm_bo_mem_space);
1008
1009 int ttm_bo_wait_cpu(struct ttm_buffer_object *bo, bool no_wait)
1010 {
1011         if ((atomic_read(&bo->cpu_writers) > 0) && no_wait)
1012                 return -EBUSY;
1013
1014         return wait_event_interruptible(bo->event_queue,
1015                                         atomic_read(&bo->cpu_writers) == 0);
1016 }
1017 EXPORT_SYMBOL(ttm_bo_wait_cpu);
1018
1019 int ttm_bo_move_buffer(struct ttm_buffer_object *bo,
1020                         struct ttm_placement *placement,
1021                         bool interruptible, bool no_wait_reserve,
1022                         bool no_wait_gpu)
1023 {
1024         int ret = 0;
1025         struct ttm_mem_reg mem;
1026
1027         BUG_ON(!atomic_read(&bo->reserved));
1028
1029         /*
1030          * FIXME: It's possible to pipeline buffer moves.
1031          * Have the driver move function wait for idle when necessary,
1032          * instead of doing it here.
1033          */
1034         spin_lock(&bo->lock);
1035         ret = ttm_bo_wait(bo, false, interruptible, no_wait_gpu);
1036         spin_unlock(&bo->lock);
1037         if (ret)
1038                 return ret;
1039         mem.num_pages = bo->num_pages;
1040         mem.size = mem.num_pages << PAGE_SHIFT;
1041         mem.page_alignment = bo->mem.page_alignment;
1042         mem.bus.io_reserved = false;
1043         /*
1044          * Determine where to move the buffer.
1045          */
1046         ret = ttm_bo_mem_space(bo, placement, &mem, interruptible, no_wait_reserve, no_wait_gpu);
1047         if (ret)
1048                 goto out_unlock;
1049         ret = ttm_bo_handle_move_mem(bo, &mem, false, interruptible, no_wait_reserve, no_wait_gpu);
1050 out_unlock:
1051         if (ret && mem.mm_node)
1052                 ttm_bo_mem_put(bo, &mem);
1053         return ret;
1054 }
1055
1056 static int ttm_bo_mem_compat(struct ttm_placement *placement,
1057                              struct ttm_mem_reg *mem)
1058 {
1059         int i;
1060
1061         if (mem->mm_node && placement->lpfn != 0 &&
1062             (mem->start < placement->fpfn ||
1063              mem->start + mem->num_pages > placement->lpfn))
1064                 return -1;
1065
1066         for (i = 0; i < placement->num_placement; i++) {
1067                 if ((placement->placement[i] & mem->placement &
1068                         TTM_PL_MASK_CACHING) &&
1069                         (placement->placement[i] & mem->placement &
1070                         TTM_PL_MASK_MEM))
1071                         return i;
1072         }
1073         return -1;
1074 }
1075
1076 int ttm_bo_validate(struct ttm_buffer_object *bo,
1077                         struct ttm_placement *placement,
1078                         bool interruptible, bool no_wait_reserve,
1079                         bool no_wait_gpu)
1080 {
1081         int ret;
1082
1083         BUG_ON(!atomic_read(&bo->reserved));
1084         /* Check that range is valid */
1085         if (placement->lpfn || placement->fpfn)
1086                 if (placement->fpfn > placement->lpfn ||
1087                         (placement->lpfn - placement->fpfn) < bo->num_pages)
1088                         return -EINVAL;
1089         /*
1090          * Check whether we need to move buffer.
1091          */
1092         ret = ttm_bo_mem_compat(placement, &bo->mem);
1093         if (ret < 0) {
1094                 ret = ttm_bo_move_buffer(bo, placement, interruptible, no_wait_reserve, no_wait_gpu);
1095                 if (ret)
1096                         return ret;
1097         } else {
1098                 /*
1099                  * Use the access and other non-mapping-related flag bits from
1100                  * the compatible memory placement flags to the active flags
1101                  */
1102                 ttm_flag_masked(&bo->mem.placement, placement->placement[ret],
1103                                 ~TTM_PL_MASK_MEMTYPE);
1104         }
1105         /*
1106          * We might need to add a TTM.
1107          */
1108         if (bo->mem.mem_type == TTM_PL_SYSTEM && bo->ttm == NULL) {
1109                 ret = ttm_bo_add_ttm(bo, true);
1110                 if (ret)
1111                         return ret;
1112         }
1113         return 0;
1114 }
1115 EXPORT_SYMBOL(ttm_bo_validate);
1116
1117 int ttm_bo_check_placement(struct ttm_buffer_object *bo,
1118                                 struct ttm_placement *placement)
1119 {
1120         int i;
1121
1122         if (placement->fpfn || placement->lpfn) {
1123                 if (bo->mem.num_pages > (placement->lpfn - placement->fpfn)) {
1124                         printk(KERN_ERR TTM_PFX "Page number range to small "
1125                                 "Need %lu pages, range is [%u, %u]\n",
1126                                 bo->mem.num_pages, placement->fpfn,
1127                                 placement->lpfn);
1128                         return -EINVAL;
1129                 }
1130         }
1131         for (i = 0; i < placement->num_placement; i++) {
1132                 if (!capable(CAP_SYS_ADMIN)) {
1133                         if (placement->placement[i] & TTM_PL_FLAG_NO_EVICT) {
1134                                 printk(KERN_ERR TTM_PFX "Need to be root to "
1135                                         "modify NO_EVICT status.\n");
1136                                 return -EINVAL;
1137                         }
1138                 }
1139         }
1140         for (i = 0; i < placement->num_busy_placement; i++) {
1141                 if (!capable(CAP_SYS_ADMIN)) {
1142                         if (placement->busy_placement[i] & TTM_PL_FLAG_NO_EVICT) {
1143                                 printk(KERN_ERR TTM_PFX "Need to be root to "
1144                                         "modify NO_EVICT status.\n");
1145                                 return -EINVAL;
1146                         }
1147                 }
1148         }
1149         return 0;
1150 }
1151
1152 int ttm_bo_init(struct ttm_bo_device *bdev,
1153                 struct ttm_buffer_object *bo,
1154                 unsigned long size,
1155                 enum ttm_bo_type type,
1156                 struct ttm_placement *placement,
1157                 uint32_t page_alignment,
1158                 unsigned long buffer_start,
1159                 bool interruptible,
1160                 struct file *persistant_swap_storage,
1161                 size_t acc_size,
1162                 void (*destroy) (struct ttm_buffer_object *))
1163 {
1164         int ret = 0;
1165         unsigned long num_pages;
1166
1167         size += buffer_start & ~PAGE_MASK;
1168         num_pages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
1169         if (num_pages == 0) {
1170                 printk(KERN_ERR TTM_PFX "Illegal buffer object size.\n");
1171                 return -EINVAL;
1172         }
1173         bo->destroy = destroy;
1174
1175         spin_lock_init(&bo->lock);
1176         kref_init(&bo->kref);
1177         kref_init(&bo->list_kref);
1178         atomic_set(&bo->cpu_writers, 0);
1179         atomic_set(&bo->reserved, 1);
1180         init_waitqueue_head(&bo->event_queue);
1181         INIT_LIST_HEAD(&bo->lru);
1182         INIT_LIST_HEAD(&bo->ddestroy);
1183         INIT_LIST_HEAD(&bo->swap);
1184         bo->bdev = bdev;
1185         bo->glob = bdev->glob;
1186         bo->type = type;
1187         bo->num_pages = num_pages;
1188         bo->mem.size = num_pages << PAGE_SHIFT;
1189         bo->mem.mem_type = TTM_PL_SYSTEM;
1190         bo->mem.num_pages = bo->num_pages;
1191         bo->mem.mm_node = NULL;
1192         bo->mem.page_alignment = page_alignment;
1193         bo->mem.bus.io_reserved = false;
1194         bo->buffer_start = buffer_start & PAGE_MASK;
1195         bo->priv_flags = 0;
1196         bo->mem.placement = (TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED);
1197         bo->seq_valid = false;
1198         bo->persistant_swap_storage = persistant_swap_storage;
1199         bo->acc_size = acc_size;
1200         atomic_inc(&bo->glob->bo_count);
1201
1202         ret = ttm_bo_check_placement(bo, placement);
1203         if (unlikely(ret != 0))
1204                 goto out_err;
1205
1206         /*
1207          * For ttm_bo_type_device buffers, allocate
1208          * address space from the device.
1209          */
1210         if (bo->type == ttm_bo_type_device) {
1211                 ret = ttm_bo_setup_vm(bo);
1212                 if (ret)
1213                         goto out_err;
1214         }
1215
1216         ret = ttm_bo_validate(bo, placement, interruptible, false, false);
1217         if (ret)
1218                 goto out_err;
1219
1220         ttm_bo_unreserve(bo);
1221         return 0;
1222
1223 out_err:
1224         ttm_bo_unreserve(bo);
1225         ttm_bo_unref(&bo);
1226
1227         return ret;
1228 }
1229 EXPORT_SYMBOL(ttm_bo_init);
1230
1231 static inline size_t ttm_bo_size(struct ttm_bo_global *glob,
1232                                  unsigned long num_pages)
1233 {
1234         size_t page_array_size = (num_pages * sizeof(void *) + PAGE_SIZE - 1) &
1235             PAGE_MASK;
1236
1237         return glob->ttm_bo_size + 2 * page_array_size;
1238 }
1239
1240 int ttm_bo_create(struct ttm_bo_device *bdev,
1241                         unsigned long size,
1242                         enum ttm_bo_type type,
1243                         struct ttm_placement *placement,
1244                         uint32_t page_alignment,
1245                         unsigned long buffer_start,
1246                         bool interruptible,
1247                         struct file *persistant_swap_storage,
1248                         struct ttm_buffer_object **p_bo)
1249 {
1250         struct ttm_buffer_object *bo;
1251         struct ttm_mem_global *mem_glob = bdev->glob->mem_glob;
1252         int ret;
1253
1254         size_t acc_size =
1255             ttm_bo_size(bdev->glob, (size + PAGE_SIZE - 1) >> PAGE_SHIFT);
1256         ret = ttm_mem_global_alloc(mem_glob, acc_size, false, false);
1257         if (unlikely(ret != 0))
1258                 return ret;
1259
1260         bo = kzalloc(sizeof(*bo), GFP_KERNEL);
1261
1262         if (unlikely(bo == NULL)) {
1263                 ttm_mem_global_free(mem_glob, acc_size);
1264                 return -ENOMEM;
1265         }
1266
1267         ret = ttm_bo_init(bdev, bo, size, type, placement, page_alignment,
1268                                 buffer_start, interruptible,
1269                                 persistant_swap_storage, acc_size, NULL);
1270         if (likely(ret == 0))
1271                 *p_bo = bo;
1272
1273         return ret;
1274 }
1275
1276 static int ttm_bo_force_list_clean(struct ttm_bo_device *bdev,
1277                                         unsigned mem_type, bool allow_errors)
1278 {
1279         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
1280         struct ttm_bo_global *glob = bdev->glob;
1281         int ret;
1282
1283         /*
1284          * Can't use standard list traversal since we're unlocking.
1285          */
1286
1287         spin_lock(&glob->lru_lock);
1288         while (!list_empty(&man->lru)) {
1289                 spin_unlock(&glob->lru_lock);
1290                 ret = ttm_mem_evict_first(bdev, mem_type, false, false, false);
1291                 if (ret) {
1292                         if (allow_errors) {
1293                                 return ret;
1294                         } else {
1295                                 printk(KERN_ERR TTM_PFX
1296                                         "Cleanup eviction failed\n");
1297                         }
1298                 }
1299                 spin_lock(&glob->lru_lock);
1300         }
1301         spin_unlock(&glob->lru_lock);
1302         return 0;
1303 }
1304
1305 int ttm_bo_clean_mm(struct ttm_bo_device *bdev, unsigned mem_type)
1306 {
1307         struct ttm_mem_type_manager *man;
1308         int ret = -EINVAL;
1309
1310         if (mem_type >= TTM_NUM_MEM_TYPES) {
1311                 printk(KERN_ERR TTM_PFX "Illegal memory type %d\n", mem_type);
1312                 return ret;
1313         }
1314         man = &bdev->man[mem_type];
1315
1316         if (!man->has_type) {
1317                 printk(KERN_ERR TTM_PFX "Trying to take down uninitialized "
1318                        "memory manager type %u\n", mem_type);
1319                 return ret;
1320         }
1321
1322         man->use_type = false;
1323         man->has_type = false;
1324
1325         ret = 0;
1326         if (mem_type > 0) {
1327                 ttm_bo_force_list_clean(bdev, mem_type, false);
1328
1329                 ret = (*man->func->takedown)(man);
1330         }
1331
1332         return ret;
1333 }
1334 EXPORT_SYMBOL(ttm_bo_clean_mm);
1335
1336 int ttm_bo_evict_mm(struct ttm_bo_device *bdev, unsigned mem_type)
1337 {
1338         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
1339
1340         if (mem_type == 0 || mem_type >= TTM_NUM_MEM_TYPES) {
1341                 printk(KERN_ERR TTM_PFX
1342                        "Illegal memory manager memory type %u.\n",
1343                        mem_type);
1344                 return -EINVAL;
1345         }
1346
1347         if (!man->has_type) {
1348                 printk(KERN_ERR TTM_PFX
1349                        "Memory type %u has not been initialized.\n",
1350                        mem_type);
1351                 return 0;
1352         }
1353
1354         return ttm_bo_force_list_clean(bdev, mem_type, true);
1355 }
1356 EXPORT_SYMBOL(ttm_bo_evict_mm);
1357
1358 int ttm_bo_init_mm(struct ttm_bo_device *bdev, unsigned type,
1359                         unsigned long p_size)
1360 {
1361         int ret = -EINVAL;
1362         struct ttm_mem_type_manager *man;
1363
1364         if (type >= TTM_NUM_MEM_TYPES) {
1365                 printk(KERN_ERR TTM_PFX "Illegal memory type %d\n", type);
1366                 return ret;
1367         }
1368
1369         man = &bdev->man[type];
1370         if (man->has_type) {
1371                 printk(KERN_ERR TTM_PFX
1372                        "Memory manager already initialized for type %d\n",
1373                        type);
1374                 return ret;
1375         }
1376
1377         ret = bdev->driver->init_mem_type(bdev, type, man);
1378         if (ret)
1379                 return ret;
1380         man->bdev = bdev;
1381
1382         ret = 0;
1383         if (type != TTM_PL_SYSTEM) {
1384                 if (!p_size) {
1385                         printk(KERN_ERR TTM_PFX
1386                                "Zero size memory manager type %d\n",
1387                                type);
1388                         return ret;
1389                 }
1390
1391                 ret = (*man->func->init)(man, p_size);
1392                 if (ret)
1393                         return ret;
1394         }
1395         man->has_type = true;
1396         man->use_type = true;
1397         man->size = p_size;
1398
1399         INIT_LIST_HEAD(&man->lru);
1400
1401         return 0;
1402 }
1403 EXPORT_SYMBOL(ttm_bo_init_mm);
1404
1405 static void ttm_bo_global_kobj_release(struct kobject *kobj)
1406 {
1407         struct ttm_bo_global *glob =
1408                 container_of(kobj, struct ttm_bo_global, kobj);
1409
1410         ttm_mem_unregister_shrink(glob->mem_glob, &glob->shrink);
1411         __free_page(glob->dummy_read_page);
1412         kfree(glob);
1413 }
1414
1415 void ttm_bo_global_release(struct drm_global_reference *ref)
1416 {
1417         struct ttm_bo_global *glob = ref->object;
1418
1419         kobject_del(&glob->kobj);
1420         kobject_put(&glob->kobj);
1421 }
1422 EXPORT_SYMBOL(ttm_bo_global_release);
1423
1424 int ttm_bo_global_init(struct drm_global_reference *ref)
1425 {
1426         struct ttm_bo_global_ref *bo_ref =
1427                 container_of(ref, struct ttm_bo_global_ref, ref);
1428         struct ttm_bo_global *glob = ref->object;
1429         int ret;
1430
1431         mutex_init(&glob->device_list_mutex);
1432         spin_lock_init(&glob->lru_lock);
1433         glob->mem_glob = bo_ref->mem_glob;
1434         glob->dummy_read_page = alloc_page(__GFP_ZERO | GFP_DMA32);
1435
1436         if (unlikely(glob->dummy_read_page == NULL)) {
1437                 ret = -ENOMEM;
1438                 goto out_no_drp;
1439         }
1440
1441         INIT_LIST_HEAD(&glob->swap_lru);
1442         INIT_LIST_HEAD(&glob->device_list);
1443
1444         ttm_mem_init_shrink(&glob->shrink, ttm_bo_swapout);
1445         ret = ttm_mem_register_shrink(glob->mem_glob, &glob->shrink);
1446         if (unlikely(ret != 0)) {
1447                 printk(KERN_ERR TTM_PFX
1448                        "Could not register buffer object swapout.\n");
1449                 goto out_no_shrink;
1450         }
1451
1452         glob->ttm_bo_extra_size =
1453                 ttm_round_pot(sizeof(struct ttm_tt)) +
1454                 ttm_round_pot(sizeof(struct ttm_backend));
1455
1456         glob->ttm_bo_size = glob->ttm_bo_extra_size +
1457                 ttm_round_pot(sizeof(struct ttm_buffer_object));
1458
1459         atomic_set(&glob->bo_count, 0);
1460
1461         ret = kobject_init_and_add(
1462                 &glob->kobj, &ttm_bo_glob_kobj_type, ttm_get_kobj(), "buffer_objects");
1463         if (unlikely(ret != 0))
1464                 kobject_put(&glob->kobj);
1465         return ret;
1466 out_no_shrink:
1467         __free_page(glob->dummy_read_page);
1468 out_no_drp:
1469         kfree(glob);
1470         return ret;
1471 }
1472 EXPORT_SYMBOL(ttm_bo_global_init);
1473
1474
1475 int ttm_bo_device_release(struct ttm_bo_device *bdev)
1476 {
1477         int ret = 0;
1478         unsigned i = TTM_NUM_MEM_TYPES;
1479         struct ttm_mem_type_manager *man;
1480         struct ttm_bo_global *glob = bdev->glob;
1481
1482         while (i--) {
1483                 man = &bdev->man[i];
1484                 if (man->has_type) {
1485                         man->use_type = false;
1486                         if ((i != TTM_PL_SYSTEM) && ttm_bo_clean_mm(bdev, i)) {
1487                                 ret = -EBUSY;
1488                                 printk(KERN_ERR TTM_PFX
1489                                        "DRM memory manager type %d "
1490                                        "is not clean.\n", i);
1491                         }
1492                         man->has_type = false;
1493                 }
1494         }
1495
1496         mutex_lock(&glob->device_list_mutex);
1497         list_del(&bdev->device_list);
1498         mutex_unlock(&glob->device_list_mutex);
1499
1500         if (!cancel_delayed_work(&bdev->wq))
1501                 flush_scheduled_work();
1502
1503         while (ttm_bo_delayed_delete(bdev, true))
1504                 ;
1505
1506         spin_lock(&glob->lru_lock);
1507         if (list_empty(&bdev->ddestroy))
1508                 TTM_DEBUG("Delayed destroy list was clean\n");
1509
1510         if (list_empty(&bdev->man[0].lru))
1511                 TTM_DEBUG("Swap list was clean\n");
1512         spin_unlock(&glob->lru_lock);
1513
1514         BUG_ON(!drm_mm_clean(&bdev->addr_space_mm));
1515         write_lock(&bdev->vm_lock);
1516         drm_mm_takedown(&bdev->addr_space_mm);
1517         write_unlock(&bdev->vm_lock);
1518
1519         return ret;
1520 }
1521 EXPORT_SYMBOL(ttm_bo_device_release);
1522
1523 int ttm_bo_device_init(struct ttm_bo_device *bdev,
1524                        struct ttm_bo_global *glob,
1525                        struct ttm_bo_driver *driver,
1526                        uint64_t file_page_offset,
1527                        bool need_dma32)
1528 {
1529         int ret = -EINVAL;
1530
1531         rwlock_init(&bdev->vm_lock);
1532         bdev->driver = driver;
1533
1534         memset(bdev->man, 0, sizeof(bdev->man));
1535
1536         /*
1537          * Initialize the system memory buffer type.
1538          * Other types need to be driver / IOCTL initialized.
1539          */
1540         ret = ttm_bo_init_mm(bdev, TTM_PL_SYSTEM, 0);
1541         if (unlikely(ret != 0))
1542                 goto out_no_sys;
1543
1544         bdev->addr_space_rb = RB_ROOT;
1545         ret = drm_mm_init(&bdev->addr_space_mm, file_page_offset, 0x10000000);
1546         if (unlikely(ret != 0))
1547                 goto out_no_addr_mm;
1548
1549         INIT_DELAYED_WORK(&bdev->wq, ttm_bo_delayed_workqueue);
1550         bdev->nice_mode = true;
1551         INIT_LIST_HEAD(&bdev->ddestroy);
1552         bdev->dev_mapping = NULL;
1553         bdev->glob = glob;
1554         bdev->need_dma32 = need_dma32;
1555
1556         mutex_lock(&glob->device_list_mutex);
1557         list_add_tail(&bdev->device_list, &glob->device_list);
1558         mutex_unlock(&glob->device_list_mutex);
1559
1560         return 0;
1561 out_no_addr_mm:
1562         ttm_bo_clean_mm(bdev, 0);
1563 out_no_sys:
1564         return ret;
1565 }
1566 EXPORT_SYMBOL(ttm_bo_device_init);
1567
1568 /*
1569  * buffer object vm functions.
1570  */
1571
1572 bool ttm_mem_reg_is_pci(struct ttm_bo_device *bdev, struct ttm_mem_reg *mem)
1573 {
1574         struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
1575
1576         if (!(man->flags & TTM_MEMTYPE_FLAG_FIXED)) {
1577                 if (mem->mem_type == TTM_PL_SYSTEM)
1578                         return false;
1579
1580                 if (man->flags & TTM_MEMTYPE_FLAG_CMA)
1581                         return false;
1582
1583                 if (mem->placement & TTM_PL_FLAG_CACHED)
1584                         return false;
1585         }
1586         return true;
1587 }
1588
1589 void ttm_bo_unmap_virtual(struct ttm_buffer_object *bo)
1590 {
1591         struct ttm_bo_device *bdev = bo->bdev;
1592         loff_t offset = (loff_t) bo->addr_space_offset;
1593         loff_t holelen = ((loff_t) bo->mem.num_pages) << PAGE_SHIFT;
1594
1595         if (!bdev->dev_mapping)
1596                 return;
1597         unmap_mapping_range(bdev->dev_mapping, offset, holelen, 1);
1598         ttm_mem_io_free(bdev, &bo->mem);
1599 }
1600 EXPORT_SYMBOL(ttm_bo_unmap_virtual);
1601
1602 static void ttm_bo_vm_insert_rb(struct ttm_buffer_object *bo)
1603 {
1604         struct ttm_bo_device *bdev = bo->bdev;
1605         struct rb_node **cur = &bdev->addr_space_rb.rb_node;
1606         struct rb_node *parent = NULL;
1607         struct ttm_buffer_object *cur_bo;
1608         unsigned long offset = bo->vm_node->start;
1609         unsigned long cur_offset;
1610
1611         while (*cur) {
1612                 parent = *cur;
1613                 cur_bo = rb_entry(parent, struct ttm_buffer_object, vm_rb);
1614                 cur_offset = cur_bo->vm_node->start;
1615                 if (offset < cur_offset)
1616                         cur = &parent->rb_left;
1617                 else if (offset > cur_offset)
1618                         cur = &parent->rb_right;
1619                 else
1620                         BUG();
1621         }
1622
1623         rb_link_node(&bo->vm_rb, parent, cur);
1624         rb_insert_color(&bo->vm_rb, &bdev->addr_space_rb);
1625 }
1626
1627 /**
1628  * ttm_bo_setup_vm:
1629  *
1630  * @bo: the buffer to allocate address space for
1631  *
1632  * Allocate address space in the drm device so that applications
1633  * can mmap the buffer and access the contents. This only
1634  * applies to ttm_bo_type_device objects as others are not
1635  * placed in the drm device address space.
1636  */
1637
1638 static int ttm_bo_setup_vm(struct ttm_buffer_object *bo)
1639 {
1640         struct ttm_bo_device *bdev = bo->bdev;
1641         int ret;
1642
1643 retry_pre_get:
1644         ret = drm_mm_pre_get(&bdev->addr_space_mm);
1645         if (unlikely(ret != 0))
1646                 return ret;
1647
1648         write_lock(&bdev->vm_lock);
1649         bo->vm_node = drm_mm_search_free(&bdev->addr_space_mm,
1650                                          bo->mem.num_pages, 0, 0);
1651
1652         if (unlikely(bo->vm_node == NULL)) {
1653                 ret = -ENOMEM;
1654                 goto out_unlock;
1655         }
1656
1657         bo->vm_node = drm_mm_get_block_atomic(bo->vm_node,
1658                                               bo->mem.num_pages, 0);
1659
1660         if (unlikely(bo->vm_node == NULL)) {
1661                 write_unlock(&bdev->vm_lock);
1662                 goto retry_pre_get;
1663         }
1664
1665         ttm_bo_vm_insert_rb(bo);
1666         write_unlock(&bdev->vm_lock);
1667         bo->addr_space_offset = ((uint64_t) bo->vm_node->start) << PAGE_SHIFT;
1668
1669         return 0;
1670 out_unlock:
1671         write_unlock(&bdev->vm_lock);
1672         return ret;
1673 }
1674
1675 int ttm_bo_wait(struct ttm_buffer_object *bo,
1676                 bool lazy, bool interruptible, bool no_wait)
1677 {
1678         struct ttm_bo_driver *driver = bo->bdev->driver;
1679         void *sync_obj;
1680         void *sync_obj_arg;
1681         int ret = 0;
1682
1683         if (likely(bo->sync_obj == NULL))
1684                 return 0;
1685
1686         while (bo->sync_obj) {
1687
1688                 if (driver->sync_obj_signaled(bo->sync_obj, bo->sync_obj_arg)) {
1689                         void *tmp_obj = bo->sync_obj;
1690                         bo->sync_obj = NULL;
1691                         clear_bit(TTM_BO_PRIV_FLAG_MOVING, &bo->priv_flags);
1692                         spin_unlock(&bo->lock);
1693                         driver->sync_obj_unref(&tmp_obj);
1694                         spin_lock(&bo->lock);
1695                         continue;
1696                 }
1697
1698                 if (no_wait)
1699                         return -EBUSY;
1700
1701                 sync_obj = driver->sync_obj_ref(bo->sync_obj);
1702                 sync_obj_arg = bo->sync_obj_arg;
1703                 spin_unlock(&bo->lock);
1704                 ret = driver->sync_obj_wait(sync_obj, sync_obj_arg,
1705                                             lazy, interruptible);
1706                 if (unlikely(ret != 0)) {
1707                         driver->sync_obj_unref(&sync_obj);
1708                         spin_lock(&bo->lock);
1709                         return ret;
1710                 }
1711                 spin_lock(&bo->lock);
1712                 if (likely(bo->sync_obj == sync_obj &&
1713                            bo->sync_obj_arg == sync_obj_arg)) {
1714                         void *tmp_obj = bo->sync_obj;
1715                         bo->sync_obj = NULL;
1716                         clear_bit(TTM_BO_PRIV_FLAG_MOVING,
1717                                   &bo->priv_flags);
1718                         spin_unlock(&bo->lock);
1719                         driver->sync_obj_unref(&sync_obj);
1720                         driver->sync_obj_unref(&tmp_obj);
1721                         spin_lock(&bo->lock);
1722                 } else {
1723                         spin_unlock(&bo->lock);
1724                         driver->sync_obj_unref(&sync_obj);
1725                         spin_lock(&bo->lock);
1726                 }
1727         }
1728         return 0;
1729 }
1730 EXPORT_SYMBOL(ttm_bo_wait);
1731
1732 int ttm_bo_synccpu_write_grab(struct ttm_buffer_object *bo, bool no_wait)
1733 {
1734         int ret = 0;
1735
1736         /*
1737          * Using ttm_bo_reserve makes sure the lru lists are updated.
1738          */
1739
1740         ret = ttm_bo_reserve(bo, true, no_wait, false, 0);
1741         if (unlikely(ret != 0))
1742                 return ret;
1743         spin_lock(&bo->lock);
1744         ret = ttm_bo_wait(bo, false, true, no_wait);
1745         spin_unlock(&bo->lock);
1746         if (likely(ret == 0))
1747                 atomic_inc(&bo->cpu_writers);
1748         ttm_bo_unreserve(bo);
1749         return ret;
1750 }
1751 EXPORT_SYMBOL(ttm_bo_synccpu_write_grab);
1752
1753 void ttm_bo_synccpu_write_release(struct ttm_buffer_object *bo)
1754 {
1755         if (atomic_dec_and_test(&bo->cpu_writers))
1756                 wake_up_all(&bo->event_queue);
1757 }
1758 EXPORT_SYMBOL(ttm_bo_synccpu_write_release);
1759
1760 /**
1761  * A buffer object shrink method that tries to swap out the first
1762  * buffer object on the bo_global::swap_lru list.
1763  */
1764
1765 static int ttm_bo_swapout(struct ttm_mem_shrink *shrink)
1766 {
1767         struct ttm_bo_global *glob =
1768             container_of(shrink, struct ttm_bo_global, shrink);
1769         struct ttm_buffer_object *bo;
1770         int ret = -EBUSY;
1771         int put_count;
1772         uint32_t swap_placement = (TTM_PL_FLAG_CACHED | TTM_PL_FLAG_SYSTEM);
1773
1774         spin_lock(&glob->lru_lock);
1775         while (ret == -EBUSY) {
1776                 if (unlikely(list_empty(&glob->swap_lru))) {
1777                         spin_unlock(&glob->lru_lock);
1778                         return -EBUSY;
1779                 }
1780
1781                 bo = list_first_entry(&glob->swap_lru,
1782                                       struct ttm_buffer_object, swap);
1783                 kref_get(&bo->list_kref);
1784
1785                 if (!list_empty(&bo->ddestroy)) {
1786                         spin_unlock(&glob->lru_lock);
1787                         (void) ttm_bo_cleanup_refs(bo, false, false, false);
1788                         kref_put(&bo->list_kref, ttm_bo_release_list);
1789                         continue;
1790                 }
1791
1792                 /**
1793                  * Reserve buffer. Since we unlock while sleeping, we need
1794                  * to re-check that nobody removed us from the swap-list while
1795                  * we slept.
1796                  */
1797
1798                 ret = ttm_bo_reserve_locked(bo, false, true, false, 0);
1799                 if (unlikely(ret == -EBUSY)) {
1800                         spin_unlock(&glob->lru_lock);
1801                         ttm_bo_wait_unreserved(bo, false);
1802                         kref_put(&bo->list_kref, ttm_bo_release_list);
1803                         spin_lock(&glob->lru_lock);
1804                 }
1805         }
1806
1807         BUG_ON(ret != 0);
1808         put_count = ttm_bo_del_from_lru(bo);
1809         spin_unlock(&glob->lru_lock);
1810
1811         while (put_count--)
1812                 kref_put(&bo->list_kref, ttm_bo_ref_bug);
1813
1814         /**
1815          * Wait for GPU, then move to system cached.
1816          */
1817
1818         spin_lock(&bo->lock);
1819         ret = ttm_bo_wait(bo, false, false, false);
1820         spin_unlock(&bo->lock);
1821
1822         if (unlikely(ret != 0))
1823                 goto out;
1824
1825         if ((bo->mem.placement & swap_placement) != swap_placement) {
1826                 struct ttm_mem_reg evict_mem;
1827
1828                 evict_mem = bo->mem;
1829                 evict_mem.mm_node = NULL;
1830                 evict_mem.placement = TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED;
1831                 evict_mem.mem_type = TTM_PL_SYSTEM;
1832
1833                 ret = ttm_bo_handle_move_mem(bo, &evict_mem, true,
1834                                              false, false, false);
1835                 if (unlikely(ret != 0))
1836                         goto out;
1837         }
1838
1839         ttm_bo_unmap_virtual(bo);
1840
1841         /**
1842          * Swap out. Buffer will be swapped in again as soon as
1843          * anyone tries to access a ttm page.
1844          */
1845
1846         if (bo->bdev->driver->swap_notify)
1847                 bo->bdev->driver->swap_notify(bo);
1848
1849         ret = ttm_tt_swapout(bo->ttm, bo->persistant_swap_storage);
1850 out:
1851
1852         /**
1853          *
1854          * Unreserve without putting on LRU to avoid swapping out an
1855          * already swapped buffer.
1856          */
1857
1858         atomic_set(&bo->reserved, 0);
1859         wake_up_all(&bo->event_queue);
1860         kref_put(&bo->list_kref, ttm_bo_release_list);
1861         return ret;
1862 }
1863
1864 void ttm_bo_swapout_all(struct ttm_bo_device *bdev)
1865 {
1866         while (ttm_bo_swapout(&bdev->glob->shrink) == 0)
1867                 ;
1868 }
1869 EXPORT_SYMBOL(ttm_bo_swapout_all);