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 <linux/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                         /**
 228                          * We've already reserved this one.
 229                          */
 230                         if (unlikely(sequence == bo->val_seq))
 231                                 return -EDEADLK;
 232                         /**
 233                          * Already reserved by a thread that will not back
 234                          * off for us. We need to back off.
 235                          */
 236                         if (unlikely(sequence - bo->val_seq < (1 << 31)))
 237                                 return -EAGAIN;
 238                 }
 239
 240                 if (no_wait)
 241                         return -EBUSY;
 242
 243                 spin_unlock(&glob->lru_lock);
 244                 ret = ttm_bo_wait_unreserved(bo, interruptible);
 245                 spin_lock(&glob->lru_lock);
 246
 247                 if (unlikely(ret))
 248                         return ret;
 249         }
 250
 251         if (use_sequence) {
 252                 /**
 253                  * Wake up waiters that may need to recheck for deadlock,
 254                  * if we decreased the sequence number.
 255                  */
 256                 if (unlikely((bo->val_seq - sequence < (1 << 31))
 257                              || !bo->seq_valid))
 258                         wake_up_all(&bo->event_queue);
 259
 260                 bo->val_seq = sequence;
 261                 bo->seq_valid = true;
 262         } else {
 263                 bo->seq_valid = false;
 264         }
 265
 266         return 0;
 267 }
 268 EXPORT_SYMBOL(ttm_bo_reserve);
 269
 270 static void ttm_bo_ref_bug(struct kref *list_kref)
 271 {
 272         BUG();
 273 }
 274
 275 void ttm_bo_list_ref_sub(struct ttm_buffer_object *bo, int count,
 276                          bool never_free)
 277 {
 278         kref_sub(&bo->list_kref, count,
 279                  (never_free) ? ttm_bo_ref_bug : ttm_bo_release_list);
 280 }
 281
 282 int ttm_bo_reserve(struct ttm_buffer_object *bo,
 283                    bool interruptible,
 284                    bool no_wait, bool use_sequence, uint32_t sequence)
 285 {
 286         struct ttm_bo_global *glob = bo->glob;
 287         int put_count = 0;
 288         int ret;
 289
 290         spin_lock(&glob->lru_lock);
 291         ret = ttm_bo_reserve_locked(bo, interruptible, no_wait, use_sequence,
 292                                     sequence);
 293         if (likely(ret == 0))
 294                 put_count = ttm_bo_del_from_lru(bo);
 295         spin_unlock(&glob->lru_lock);
 296
 297         ttm_bo_list_ref_sub(bo, put_count, true);
 298
 299         return ret;
 300 }
 301
 302 void ttm_bo_unreserve_locked(struct ttm_buffer_object *bo)
 303 {
 304         ttm_bo_add_to_lru(bo);
 305         atomic_set(&bo->reserved, 0);
 306         wake_up_all(&bo->event_queue);
 307 }
 308
 309 void ttm_bo_unreserve(struct ttm_buffer_object *bo)
 310 {
 311         struct ttm_bo_global *glob = bo->glob;
 312
 313         spin_lock(&glob->lru_lock);
 314         ttm_bo_unreserve_locked(bo);
 315         spin_unlock(&glob->lru_lock);
 316 }
 317 EXPORT_SYMBOL(ttm_bo_unreserve);
 318
 319 /*
 320  * Call bo->mutex locked.
 321  */
 322 static int ttm_bo_add_ttm(struct ttm_buffer_object *bo, bool zero_alloc)
 323 {
 324         struct ttm_bo_device *bdev = bo->bdev;
 325         struct ttm_bo_global *glob = bo->glob;
 326         int ret = 0;
 327         uint32_t page_flags = 0;
 328
 329         TTM_ASSERT_LOCKED(&bo->mutex);
 330         bo->ttm = NULL;
 331
 332         if (bdev->need_dma32)
 333                 page_flags |= TTM_PAGE_FLAG_DMA32;
 334
 335         switch (bo->type) {
 336         case ttm_bo_type_device:
 337                 if (zero_alloc)
 338                         page_flags |= TTM_PAGE_FLAG_ZERO_ALLOC;
 339         case ttm_bo_type_kernel:
 340                 bo->ttm = ttm_tt_create(bdev, bo->num_pages << PAGE_SHIFT,
 341                                         page_flags, glob->dummy_read_page);
 342                 if (unlikely(bo->ttm == NULL))
 343                         ret = -ENOMEM;
 344                 break;
 345         default:
 346                 printk(KERN_ERR TTM_PFX "Illegal buffer object type\n");
 347                 ret = -EINVAL;
 348                 break;
 349         }
 350
 351         return ret;
 352 }
 353
 354 static int ttm_bo_handle_move_mem(struct ttm_buffer_object *bo,
 355                                   struct ttm_mem_reg *mem,
 356                                   bool evict, bool interruptible,
 357                                   bool no_wait_reserve, bool no_wait_gpu)
 358 {
 359         struct ttm_bo_device *bdev = bo->bdev;
 360         bool old_is_pci = ttm_mem_reg_is_pci(bdev, &bo->mem);
 361         bool new_is_pci = ttm_mem_reg_is_pci(bdev, mem);
 362         struct ttm_mem_type_manager *old_man = &bdev->man[bo->mem.mem_type];
 363         struct ttm_mem_type_manager *new_man = &bdev->man[mem->mem_type];
 364         int ret = 0;
 365
 366         if (old_is_pci || new_is_pci ||
 367             ((mem->placement & bo->mem.placement & TTM_PL_MASK_CACHING) == 0)) {
 368                 ret = ttm_mem_io_lock(old_man, true);
 369                 if (unlikely(ret != 0))
 370                         goto out_err;
 371                 ttm_bo_unmap_virtual_locked(bo);
 372                 ttm_mem_io_unlock(old_man);
 373         }
 374
 375         /*
 376          * Create and bind a ttm if required.
 377          */
 378
 379         if (!(new_man->flags & TTM_MEMTYPE_FLAG_FIXED)) {
 380                 if (bo->ttm == NULL) {
 381                         bool zero = !(old_man->flags & TTM_MEMTYPE_FLAG_FIXED);
 382                         ret = ttm_bo_add_ttm(bo, zero);
 383                         if (ret)
 384                                 goto out_err;
 385                 }
 386
 387                 ret = ttm_tt_set_placement_caching(bo->ttm, mem->placement);
 388                 if (ret)
 389                         goto out_err;
 390
 391                 if (mem->mem_type != TTM_PL_SYSTEM) {
 392                         ret = ttm_tt_bind(bo->ttm, mem);
 393                         if (ret)
 394                                 goto out_err;
 395                 }
 396
 397                 if (bo->mem.mem_type == TTM_PL_SYSTEM) {
 398                         if (bdev->driver->move_notify)
 399                                 bdev->driver->move_notify(bo, mem);
 400                         bo->mem = *mem;
 401                         mem->mm_node = NULL;
 402                         goto moved;
 403                 }
 404         }
 405
 406         if (bdev->driver->move_notify)
 407                 bdev->driver->move_notify(bo, mem);
 408
 409         if (!(old_man->flags & TTM_MEMTYPE_FLAG_FIXED) &&
 410             !(new_man->flags & TTM_MEMTYPE_FLAG_FIXED))
 411                 ret = ttm_bo_move_ttm(bo, evict, no_wait_reserve, no_wait_gpu, mem);
 412         else if (bdev->driver->move)
 413                 ret = bdev->driver->move(bo, evict, interruptible,
 414                                          no_wait_reserve, no_wait_gpu, mem);
 415         else
 416                 ret = ttm_bo_move_memcpy(bo, evict, no_wait_reserve, no_wait_gpu, mem);
 417
 418         if (ret)
 419                 goto out_err;
 420
 421 moved:
 422         if (bo->evicted) {
 423                 ret = bdev->driver->invalidate_caches(bdev, bo->mem.placement);
 424                 if (ret)
 425                         printk(KERN_ERR TTM_PFX "Can not flush read caches\n");
 426                 bo->evicted = false;
 427         }
 428
 429         if (bo->mem.mm_node) {
 430                 bo->offset = (bo->mem.start << PAGE_SHIFT) +
 431                     bdev->man[bo->mem.mem_type].gpu_offset;
 432                 bo->cur_placement = bo->mem.placement;
 433         } else
 434                 bo->offset = 0;
 435
 436         return 0;
 437
 438 out_err:
 439         new_man = &bdev->man[bo->mem.mem_type];
 440         if ((new_man->flags & TTM_MEMTYPE_FLAG_FIXED) && bo->ttm) {
 441                 ttm_tt_unbind(bo->ttm);
 442                 ttm_tt_destroy(bo->ttm);
 443                 bo->ttm = NULL;
 444         }
 445
 446         return ret;
 447 }
 448
 449 /**
 450  * Call bo::reserved.
 451  * Will release GPU memory type usage on destruction.
 452  * This is the place to put in driver specific hooks to release
 453  * driver private resources.
 454  * Will release the bo::reserved lock.
 455  */
 456
 457 static void ttm_bo_cleanup_memtype_use(struct ttm_buffer_object *bo)
 458 {
 459         if (bo->ttm) {
 460                 ttm_tt_unbind(bo->ttm);
 461                 ttm_tt_destroy(bo->ttm);
 462                 bo->ttm = NULL;
 463         }
 464         ttm_bo_mem_put(bo, &bo->mem);
 465
 466         atomic_set(&bo->reserved, 0);
 467
 468         /*
 469          * Make processes trying to reserve really pick it up.
 470          */
 471         smp_mb__after_atomic_dec();
 472         wake_up_all(&bo->event_queue);
 473 }
 474
 475 static void ttm_bo_cleanup_refs_or_queue(struct ttm_buffer_object *bo)
 476 {
 477         struct ttm_bo_device *bdev = bo->bdev;
 478         struct ttm_bo_global *glob = bo->glob;
 479         struct ttm_bo_driver *driver;
 480         void *sync_obj = NULL;
 481         void *sync_obj_arg;
 482         int put_count;
 483         int ret;
 484
 485         spin_lock(&bdev->fence_lock);
 486         (void) ttm_bo_wait(bo, false, false, true);
 487         if (!bo->sync_obj) {
 488
 489                 spin_lock(&glob->lru_lock);
 490
 491                 /**
 492                  * Lock inversion between bo:reserve and bdev::fence_lock here,
 493                  * but that's OK, since we're only trylocking.
 494                  */
 495
 496                 ret = ttm_bo_reserve_locked(bo, false, true, false, 0);
 497
 498                 if (unlikely(ret == -EBUSY))
 499                         goto queue;
 500
 501                 spin_unlock(&bdev->fence_lock);
 502                 put_count = ttm_bo_del_from_lru(bo);
 503
 504                 spin_unlock(&glob->lru_lock);
 505                 ttm_bo_cleanup_memtype_use(bo);
 506
 507                 ttm_bo_list_ref_sub(bo, put_count, true);
 508
 509                 return;
 510         } else {
 511                 spin_lock(&glob->lru_lock);
 512         }
 513 queue:
 514         driver = bdev->driver;
 515         if (bo->sync_obj)
 516                 sync_obj = driver->sync_obj_ref(bo->sync_obj);
 517         sync_obj_arg = bo->sync_obj_arg;
 518
 519         kref_get(&bo->list_kref);
 520         list_add_tail(&bo->ddestroy, &bdev->ddestroy);
 521         spin_unlock(&glob->lru_lock);
 522         spin_unlock(&bdev->fence_lock);
 523
 524         if (sync_obj) {
 525                 driver->sync_obj_flush(sync_obj, sync_obj_arg);
 526                 driver->sync_obj_unref(&sync_obj);
 527         }
 528         schedule_delayed_work(&bdev->wq,
 529                               ((HZ / 100) < 1) ? 1 : HZ / 100);
 530 }
 531
 532 /**
 533  * function ttm_bo_cleanup_refs
 534  * If bo idle, remove from delayed- and lru lists, and unref.
 535  * If not idle, do nothing.
 536  *
 537  * @interruptible         Any sleeps should occur interruptibly.
 538  * @no_wait_reserve       Never wait for reserve. Return -EBUSY instead.
 539  * @no_wait_gpu           Never wait for gpu. Return -EBUSY instead.
 540  */
 541
 542 static int ttm_bo_cleanup_refs(struct ttm_buffer_object *bo,
 543                                bool interruptible,
 544                                bool no_wait_reserve,
 545                                bool no_wait_gpu)
 546 {
 547         struct ttm_bo_device *bdev = bo->bdev;
 548         struct ttm_bo_global *glob = bo->glob;
 549         int put_count;
 550         int ret = 0;
 551
 552 retry:
 553         spin_lock(&bdev->fence_lock);
 554         ret = ttm_bo_wait(bo, false, interruptible, no_wait_gpu);
 555         spin_unlock(&bdev->fence_lock);
 556
 557         if (unlikely(ret != 0))
 558                 return ret;
 559
 560         spin_lock(&glob->lru_lock);
 561         ret = ttm_bo_reserve_locked(bo, interruptible,
 562                                     no_wait_reserve, false, 0);
 563
 564         if (unlikely(ret != 0) || list_empty(&bo->ddestroy)) {
 565                 spin_unlock(&glob->lru_lock);
 566                 return ret;
 567         }
 568
 569         /**
 570          * We can re-check for sync object without taking
 571          * the bo::lock since setting the sync object requires
 572          * also bo::reserved. A busy object at this point may
 573          * be caused by another thread recently starting an accelerated
 574          * eviction.
 575          */
 576
 577         if (unlikely(bo->sync_obj)) {
 578                 atomic_set(&bo->reserved, 0);
 579                 wake_up_all(&bo->event_queue);
 580                 spin_unlock(&glob->lru_lock);
 581                 goto retry;
 582         }
 583
 584         put_count = ttm_bo_del_from_lru(bo);
 585         list_del_init(&bo->ddestroy);
 586         ++put_count;
 587
 588         spin_unlock(&glob->lru_lock);
 589         ttm_bo_cleanup_memtype_use(bo);
 590
 591         ttm_bo_list_ref_sub(bo, put_count, true);
 592
 593         return 0;
 594 }
 595
 596 /**
 597  * Traverse the delayed list, and call ttm_bo_cleanup_refs on all
 598  * encountered buffers.
 599  */
 600
 601 static int ttm_bo_delayed_delete(struct ttm_bo_device *bdev, bool remove_all)
 602 {
 603         struct ttm_bo_global *glob = bdev->glob;
 604         struct ttm_buffer_object *entry = NULL;
 605         int ret = 0;
 606
 607         spin_lock(&glob->lru_lock);
 608         if (list_empty(&bdev->ddestroy))
 609                 goto out_unlock;
 610
 611         entry = list_first_entry(&bdev->ddestroy,
 612                 struct ttm_buffer_object, ddestroy);
 613         kref_get(&entry->list_kref);
 614
 615         for (;;) {
 616                 struct ttm_buffer_object *nentry = NULL;
 617
 618                 if (entry->ddestroy.next != &bdev->ddestroy) {
 619                         nentry = list_first_entry(&entry->ddestroy,
 620                                 struct ttm_buffer_object, ddestroy);
 621                         kref_get(&nentry->list_kref);
 622                 }
 623
 624                 spin_unlock(&glob->lru_lock);
 625                 ret = ttm_bo_cleanup_refs(entry, false, !remove_all,
 626                                           !remove_all);
 627                 kref_put(&entry->list_kref, ttm_bo_release_list);
 628                 entry = nentry;
 629
 630                 if (ret || !entry)
 631                         goto out;
 632
 633                 spin_lock(&glob->lru_lock);
 634                 if (list_empty(&entry->ddestroy))
 635                         break;
 636         }
 637
 638 out_unlock:
 639         spin_unlock(&glob->lru_lock);
 640 out:
 641         if (entry)
 642                 kref_put(&entry->list_kref, ttm_bo_release_list);
 643         return ret;
 644 }
 645
 646 static void ttm_bo_delayed_workqueue(struct work_struct *work)
 647 {
 648         struct ttm_bo_device *bdev =
 649             container_of(work, struct ttm_bo_device, wq.work);
 650
 651         if (ttm_bo_delayed_delete(bdev, false)) {
 652                 schedule_delayed_work(&bdev->wq,
 653                                       ((HZ / 100) < 1) ? 1 : HZ / 100);
 654         }
 655 }
 656
 657 static void ttm_bo_release(struct kref *kref)
 658 {
 659         struct ttm_buffer_object *bo =
 660             container_of(kref, struct ttm_buffer_object, kref);
 661         struct ttm_bo_device *bdev = bo->bdev;
 662         struct ttm_mem_type_manager *man = &bdev->man[bo->mem.mem_type];
 663
 664         if (likely(bo->vm_node != NULL)) {
 665                 rb_erase(&bo->vm_rb, &bdev->addr_space_rb);
 666                 drm_mm_put_block(bo->vm_node);
 667                 bo->vm_node = NULL;
 668         }
 669         write_unlock(&bdev->vm_lock);
 670         ttm_mem_io_lock(man, false);
 671         ttm_mem_io_free_vm(bo);
 672         ttm_mem_io_unlock(man);
 673         ttm_bo_cleanup_refs_or_queue(bo);
 674         kref_put(&bo->list_kref, ttm_bo_release_list);
 675         write_lock(&bdev->vm_lock);
 676 }
 677
 678 void ttm_bo_unref(struct ttm_buffer_object **p_bo)
 679 {
 680         struct ttm_buffer_object *bo = *p_bo;
 681         struct ttm_bo_device *bdev = bo->bdev;
 682
 683         *p_bo = NULL;
 684         write_lock(&bdev->vm_lock);
 685         kref_put(&bo->kref, ttm_bo_release);
 686         write_unlock(&bdev->vm_lock);
 687 }
 688 EXPORT_SYMBOL(ttm_bo_unref);
 689
 690 int ttm_bo_lock_delayed_workqueue(struct ttm_bo_device *bdev)
 691 {
 692         return cancel_delayed_work_sync(&bdev->wq);
 693 }
 694 EXPORT_SYMBOL(ttm_bo_lock_delayed_workqueue);
 695
 696 void ttm_bo_unlock_delayed_workqueue(struct ttm_bo_device *bdev, int resched)
 697 {
 698         if (resched)
 699                 schedule_delayed_work(&bdev->wq,
 700                                       ((HZ / 100) < 1) ? 1 : HZ / 100);
 701 }
 702 EXPORT_SYMBOL(ttm_bo_unlock_delayed_workqueue);
 703
 704 static int ttm_bo_evict(struct ttm_buffer_object *bo, bool interruptible,
 705                         bool no_wait_reserve, bool no_wait_gpu)
 706 {
 707         struct ttm_bo_device *bdev = bo->bdev;
 708         struct ttm_mem_reg evict_mem;
 709         struct ttm_placement placement;
 710         int ret = 0;
 711
 712         spin_lock(&bdev->fence_lock);
 713         ret = ttm_bo_wait(bo, false, interruptible, no_wait_gpu);
 714         spin_unlock(&bdev->fence_lock);
 715
 716         if (unlikely(ret != 0)) {
 717                 if (ret != -ERESTARTSYS) {
 718                         printk(KERN_ERR TTM_PFX
 719                                "Failed to expire sync object before "
 720                                "buffer eviction.\n");
 721                 }
 722                 goto out;
 723         }
 724
 725         BUG_ON(!atomic_read(&bo->reserved));
 726
 727         evict_mem = bo->mem;
 728         evict_mem.mm_node = NULL;
 729         evict_mem.bus.io_reserved_vm = false;
 730         evict_mem.bus.io_reserved_count = 0;
 731
 732         placement.fpfn = 0;
 733         placement.lpfn = 0;
 734         placement.num_placement = 0;
 735         placement.num_busy_placement = 0;
 736         bdev->driver->evict_flags(bo, &placement);
 737         ret = ttm_bo_mem_space(bo, &placement, &evict_mem, interruptible,
 738                                 no_wait_reserve, no_wait_gpu);
 739         if (ret) {
 740                 if (ret != -ERESTARTSYS) {
 741                         printk(KERN_ERR TTM_PFX
 742                                "Failed to find memory space for "
 743                                "buffer 0x%p eviction.\n", bo);
 744                         ttm_bo_mem_space_debug(bo, &placement);
 745                 }
 746                 goto out;
 747         }
 748
 749         ret = ttm_bo_handle_move_mem(bo, &evict_mem, true, interruptible,
 750                                      no_wait_reserve, no_wait_gpu);
 751         if (ret) {
 752                 if (ret != -ERESTARTSYS)
 753                         printk(KERN_ERR TTM_PFX "Buffer eviction failed\n");
 754                 ttm_bo_mem_put(bo, &evict_mem);
 755                 goto out;
 756         }
 757         bo->evicted = true;
 758 out:
 759         return ret;
 760 }
 761
 762 static int ttm_mem_evict_first(struct ttm_bo_device *bdev,
 763                                 uint32_t mem_type,
 764                                 bool interruptible, bool no_wait_reserve,
 765                                 bool no_wait_gpu)
 766 {
 767         struct ttm_bo_global *glob = bdev->glob;
 768         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
 769         struct ttm_buffer_object *bo;
 770         int ret, put_count = 0;
 771
 772 retry:
 773         spin_lock(&glob->lru_lock);
 774         if (list_empty(&man->lru)) {
 775                 spin_unlock(&glob->lru_lock);
 776                 return -EBUSY;
 777         }
 778
 779         bo = list_first_entry(&man->lru, struct ttm_buffer_object, lru);
 780         kref_get(&bo->list_kref);
 781
 782         if (!list_empty(&bo->ddestroy)) {
 783                 spin_unlock(&glob->lru_lock);
 784                 ret = ttm_bo_cleanup_refs(bo, interruptible,
 785                                           no_wait_reserve, no_wait_gpu);
 786                 kref_put(&bo->list_kref, ttm_bo_release_list);
 787
 788                 if (likely(ret == 0 || ret == -ERESTARTSYS))
 789                         return ret;
 790
 791                 goto retry;
 792         }
 793
 794         ret = ttm_bo_reserve_locked(bo, false, no_wait_reserve, false, 0);
 795
 796         if (unlikely(ret == -EBUSY)) {
 797                 spin_unlock(&glob->lru_lock);
 798                 if (likely(!no_wait_gpu))
 799                         ret = ttm_bo_wait_unreserved(bo, interruptible);
 800
 801                 kref_put(&bo->list_kref, ttm_bo_release_list);
 802
 803                 /**
 804                  * We *need* to retry after releasing the lru lock.
 805                  */
 806
 807                 if (unlikely(ret != 0))
 808                         return ret;
 809                 goto retry;
 810         }
 811
 812         put_count = ttm_bo_del_from_lru(bo);
 813         spin_unlock(&glob->lru_lock);
 814
 815         BUG_ON(ret != 0);
 816
 817         ttm_bo_list_ref_sub(bo, put_count, true);
 818
 819         ret = ttm_bo_evict(bo, interruptible, no_wait_reserve, no_wait_gpu);
 820         ttm_bo_unreserve(bo);
 821
 822         kref_put(&bo->list_kref, ttm_bo_release_list);
 823         return ret;
 824 }
 825
 826 void ttm_bo_mem_put(struct ttm_buffer_object *bo, struct ttm_mem_reg *mem)
 827 {
 828         struct ttm_mem_type_manager *man = &bo->bdev->man[mem->mem_type];
 829
 830         if (mem->mm_node)
 831                 (*man->func->put_node)(man, mem);
 832 }
 833 EXPORT_SYMBOL(ttm_bo_mem_put);
 834
 835 /**
 836  * Repeatedly evict memory from the LRU for @mem_type until we create enough
 837  * space, or we've evicted everything and there isn't enough space.
 838  */
 839 static int ttm_bo_mem_force_space(struct ttm_buffer_object *bo,
 840                                         uint32_t mem_type,
 841                                         struct ttm_placement *placement,
 842                                         struct ttm_mem_reg *mem,
 843                                         bool interruptible,
 844                                         bool no_wait_reserve,
 845                                         bool no_wait_gpu)
 846 {
 847         struct ttm_bo_device *bdev = bo->bdev;
 848         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
 849         int ret;
 850
 851         do {
 852                 ret = (*man->func->get_node)(man, bo, placement, mem);
 853                 if (unlikely(ret != 0))
 854                         return ret;
 855                 if (mem->mm_node)
 856                         break;
 857                 ret = ttm_mem_evict_first(bdev, mem_type, interruptible,
 858                                                 no_wait_reserve, no_wait_gpu);
 859                 if (unlikely(ret != 0))
 860                         return ret;
 861         } while (1);
 862         if (mem->mm_node == NULL)
 863                 return -ENOMEM;
 864         mem->mem_type = mem_type;
 865         return 0;
 866 }
 867
 868 static uint32_t ttm_bo_select_caching(struct ttm_mem_type_manager *man,
 869                                       uint32_t cur_placement,
 870                                       uint32_t proposed_placement)
 871 {
 872         uint32_t caching = proposed_placement & TTM_PL_MASK_CACHING;
 873         uint32_t result = proposed_placement & ~TTM_PL_MASK_CACHING;
 874
 875         /**
 876          * Keep current caching if possible.
 877          */
 878
 879         if ((cur_placement & caching) != 0)
 880                 result |= (cur_placement & caching);
 881         else if ((man->default_caching & caching) != 0)
 882                 result |= man->default_caching;
 883         else if ((TTM_PL_FLAG_CACHED & caching) != 0)
 884                 result |= TTM_PL_FLAG_CACHED;
 885         else if ((TTM_PL_FLAG_WC & caching) != 0)
 886                 result |= TTM_PL_FLAG_WC;
 887         else if ((TTM_PL_FLAG_UNCACHED & caching) != 0)
 888                 result |= TTM_PL_FLAG_UNCACHED;
 889
 890         return result;
 891 }
 892
 893 static bool ttm_bo_mt_compatible(struct ttm_mem_type_manager *man,
 894                                  uint32_t mem_type,
 895                                  uint32_t proposed_placement,
 896                                  uint32_t *masked_placement)
 897 {
 898         uint32_t cur_flags = ttm_bo_type_flags(mem_type);
 899
 900         if ((cur_flags & proposed_placement & TTM_PL_MASK_MEM) == 0)
 901                 return false;
 902
 903         if ((proposed_placement & man->available_caching) == 0)
 904                 return false;
 905
 906         cur_flags |= (proposed_placement & man->available_caching);
 907
 908         *masked_placement = cur_flags;
 909         return true;
 910 }
 911
 912 /**
 913  * Creates space for memory region @mem according to its type.
 914  *
 915  * This function first searches for free space in compatible memory types in
 916  * the priority order defined by the driver.  If free space isn't found, then
 917  * ttm_bo_mem_force_space is attempted in priority order to evict and find
 918  * space.
 919  */
 920 int ttm_bo_mem_space(struct ttm_buffer_object *bo,
 921                         struct ttm_placement *placement,
 922                         struct ttm_mem_reg *mem,
 923                         bool interruptible, bool no_wait_reserve,
 924                         bool no_wait_gpu)
 925 {
 926         struct ttm_bo_device *bdev = bo->bdev;
 927         struct ttm_mem_type_manager *man;
 928         uint32_t mem_type = TTM_PL_SYSTEM;
 929         uint32_t cur_flags = 0;
 930         bool type_found = false;
 931         bool type_ok = false;
 932         bool has_erestartsys = false;
 933         int i, ret;
 934
 935         mem->mm_node = NULL;
 936         for (i = 0; i < placement->num_placement; ++i) {
 937                 ret = ttm_mem_type_from_flags(placement->placement[i],
 938                                                 &mem_type);
 939                 if (ret)
 940                         return ret;
 941                 man = &bdev->man[mem_type];
 942
 943                 type_ok = ttm_bo_mt_compatible(man,
 944                                                 mem_type,
 945                                                 placement->placement[i],
 946                                                 &cur_flags);
 947
 948                 if (!type_ok)
 949                         continue;
 950
 951                 cur_flags = ttm_bo_select_caching(man, bo->mem.placement,
 952                                                   cur_flags);
 953                 /*
 954                  * Use the access and other non-mapping-related flag bits from
 955                  * the memory placement flags to the current flags
 956                  */
 957                 ttm_flag_masked(&cur_flags, placement->placement[i],
 958                                 ~TTM_PL_MASK_MEMTYPE);
 959
 960                 if (mem_type == TTM_PL_SYSTEM)
 961                         break;
 962
 963                 if (man->has_type && man->use_type) {
 964                         type_found = true;
 965                         ret = (*man->func->get_node)(man, bo, placement, mem);
 966                         if (unlikely(ret))
 967                                 return ret;
 968                 }
 969                 if (mem->mm_node)
 970                         break;
 971         }
 972
 973         if ((type_ok && (mem_type == TTM_PL_SYSTEM)) || mem->mm_node) {
 974                 mem->mem_type = mem_type;
 975                 mem->placement = cur_flags;
 976                 return 0;
 977         }
 978
 979         if (!type_found)
 980                 return -EINVAL;
 981
 982         for (i = 0; i < placement->num_busy_placement; ++i) {
 983                 ret = ttm_mem_type_from_flags(placement->busy_placement[i],
 984                                                 &mem_type);
 985                 if (ret)
 986                         return ret;
 987                 man = &bdev->man[mem_type];
 988                 if (!man->has_type)
 989                         continue;
 990                 if (!ttm_bo_mt_compatible(man,
 991                                                 mem_type,
 992                                                 placement->busy_placement[i],
 993                                                 &cur_flags))
 994                         continue;
 995
 996                 cur_flags = ttm_bo_select_caching(man, bo->mem.placement,
 997                                                   cur_flags);
 998                 /*
 999                  * Use the access and other non-mapping-related flag bits from
1000                  * the memory placement flags to the current flags
1001                  */
1002                 ttm_flag_masked(&cur_flags, placement->busy_placement[i],
1003                                 ~TTM_PL_MASK_MEMTYPE);
1004
1005
1006                 if (mem_type == TTM_PL_SYSTEM) {
1007                         mem->mem_type = mem_type;
1008                         mem->placement = cur_flags;
1009                         mem->mm_node = NULL;
1010                         return 0;
1011                 }
1012
1013                 ret = ttm_bo_mem_force_space(bo, mem_type, placement, mem,
1014                                                 interruptible, no_wait_reserve, no_wait_gpu);
1015                 if (ret == 0 && mem->mm_node) {
1016                         mem->placement = cur_flags;
1017                         return 0;
1018                 }
1019                 if (ret == -ERESTARTSYS)
1020                         has_erestartsys = true;
1021         }
1022         ret = (has_erestartsys) ? -ERESTARTSYS : -ENOMEM;
1023         return ret;
1024 }
1025 EXPORT_SYMBOL(ttm_bo_mem_space);
1026
1027 int ttm_bo_wait_cpu(struct ttm_buffer_object *bo, bool no_wait)
1028 {
1029         if ((atomic_read(&bo->cpu_writers) > 0) && no_wait)
1030                 return -EBUSY;
1031
1032         return wait_event_interruptible(bo->event_queue,
1033                                         atomic_read(&bo->cpu_writers) == 0);
1034 }
1035 EXPORT_SYMBOL(ttm_bo_wait_cpu);
1036
1037 int ttm_bo_move_buffer(struct ttm_buffer_object *bo,
1038                         struct ttm_placement *placement,
1039                         bool interruptible, bool no_wait_reserve,
1040                         bool no_wait_gpu)
1041 {
1042         int ret = 0;
1043         struct ttm_mem_reg mem;
1044         struct ttm_bo_device *bdev = bo->bdev;
1045
1046         BUG_ON(!atomic_read(&bo->reserved));
1047
1048         /*
1049          * FIXME: It's possible to pipeline buffer moves.
1050          * Have the driver move function wait for idle when necessary,
1051          * instead of doing it here.
1052          */
1053         spin_lock(&bdev->fence_lock);
1054         ret = ttm_bo_wait(bo, false, interruptible, no_wait_gpu);
1055         spin_unlock(&bdev->fence_lock);
1056         if (ret)
1057                 return ret;
1058         mem.num_pages = bo->num_pages;
1059         mem.size = mem.num_pages << PAGE_SHIFT;
1060         mem.page_alignment = bo->mem.page_alignment;
1061         mem.bus.io_reserved_vm = false;
1062         mem.bus.io_reserved_count = 0;
1063         /*
1064          * Determine where to move the buffer.
1065          */
1066         ret = ttm_bo_mem_space(bo, placement, &mem, interruptible, no_wait_reserve, no_wait_gpu);
1067         if (ret)
1068                 goto out_unlock;
1069         ret = ttm_bo_handle_move_mem(bo, &mem, false, interruptible, no_wait_reserve, no_wait_gpu);
1070 out_unlock:
1071         if (ret && mem.mm_node)
1072                 ttm_bo_mem_put(bo, &mem);
1073         return ret;
1074 }
1075
1076 static int ttm_bo_mem_compat(struct ttm_placement *placement,
1077                              struct ttm_mem_reg *mem)
1078 {
1079         int i;
1080
1081         if (mem->mm_node && placement->lpfn != 0 &&
1082             (mem->start < placement->fpfn ||
1083              mem->start + mem->num_pages > placement->lpfn))
1084                 return -1;
1085
1086         for (i = 0; i < placement->num_placement; i++) {
1087                 if ((placement->placement[i] & mem->placement &
1088                         TTM_PL_MASK_CACHING) &&
1089                         (placement->placement[i] & mem->placement &
1090                         TTM_PL_MASK_MEM))
1091                         return i;
1092         }
1093         return -1;
1094 }
1095
1096 int ttm_bo_validate(struct ttm_buffer_object *bo,
1097                         struct ttm_placement *placement,
1098                         bool interruptible, bool no_wait_reserve,
1099                         bool no_wait_gpu)
1100 {
1101         int ret;
1102
1103         BUG_ON(!atomic_read(&bo->reserved));
1104         /* Check that range is valid */
1105         if (placement->lpfn || placement->fpfn)
1106                 if (placement->fpfn > placement->lpfn ||
1107                         (placement->lpfn - placement->fpfn) < bo->num_pages)
1108                         return -EINVAL;
1109         /*
1110          * Check whether we need to move buffer.
1111          */
1112         ret = ttm_bo_mem_compat(placement, &bo->mem);
1113         if (ret < 0) {
1114                 ret = ttm_bo_move_buffer(bo, placement, interruptible, no_wait_reserve, no_wait_gpu);
1115                 if (ret)
1116                         return ret;
1117         } else {
1118                 /*
1119                  * Use the access and other non-mapping-related flag bits from
1120                  * the compatible memory placement flags to the active flags
1121                  */
1122                 ttm_flag_masked(&bo->mem.placement, placement->placement[ret],
1123                                 ~TTM_PL_MASK_MEMTYPE);
1124         }
1125         /*
1126          * We might need to add a TTM.
1127          */
1128         if (bo->mem.mem_type == TTM_PL_SYSTEM && bo->ttm == NULL) {
1129                 ret = ttm_bo_add_ttm(bo, true);
1130                 if (ret)
1131                         return ret;
1132         }
1133         return 0;
1134 }
1135 EXPORT_SYMBOL(ttm_bo_validate);
1136
1137 int ttm_bo_check_placement(struct ttm_buffer_object *bo,
1138                                 struct ttm_placement *placement)
1139 {
1140         BUG_ON((placement->fpfn || placement->lpfn) &&
1141                (bo->mem.num_pages > (placement->lpfn - placement->fpfn)));
1142
1143         return 0;
1144 }
1145
1146 int ttm_bo_init(struct ttm_bo_device *bdev,
1147                 struct ttm_buffer_object *bo,
1148                 unsigned long size,
1149                 enum ttm_bo_type type,
1150                 struct ttm_placement *placement,
1151                 uint32_t page_alignment,
1152                 unsigned long buffer_start,
1153                 bool interruptible,
1154                 struct file *persistent_swap_storage,
1155                 size_t acc_size,
1156                 void (*destroy) (struct ttm_buffer_object *))
1157 {
1158         int ret = 0;
1159         unsigned long num_pages;
1160
1161         size += buffer_start & ~PAGE_MASK;
1162         num_pages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
1163         if (num_pages == 0) {
1164                 printk(KERN_ERR TTM_PFX "Illegal buffer object size.\n");
1165                 if (destroy)
1166                         (*destroy)(bo);
1167                 else
1168                         kfree(bo);
1169                 return -EINVAL;
1170         }
1171         bo->destroy = destroy;
1172
1173         kref_init(&bo->kref);
1174         kref_init(&bo->list_kref);
1175         atomic_set(&bo->cpu_writers, 0);
1176         atomic_set(&bo->reserved, 1);
1177         init_waitqueue_head(&bo->event_queue);
1178         INIT_LIST_HEAD(&bo->lru);
1179         INIT_LIST_HEAD(&bo->ddestroy);
1180         INIT_LIST_HEAD(&bo->swap);
1181         INIT_LIST_HEAD(&bo->io_reserve_lru);
1182         bo->bdev = bdev;
1183         bo->glob = bdev->glob;
1184         bo->type = type;
1185         bo->num_pages = num_pages;
1186         bo->mem.size = num_pages << PAGE_SHIFT;
1187         bo->mem.mem_type = TTM_PL_SYSTEM;
1188         bo->mem.num_pages = bo->num_pages;
1189         bo->mem.mm_node = NULL;
1190         bo->mem.page_alignment = page_alignment;
1191         bo->mem.bus.io_reserved_vm = false;
1192         bo->mem.bus.io_reserved_count = 0;
1193         bo->buffer_start = buffer_start & PAGE_MASK;
1194         bo->priv_flags = 0;
1195         bo->mem.placement = (TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED);
1196         bo->seq_valid = false;
1197         bo->persistent_swap_storage = persistent_swap_storage;
1198         bo->acc_size = acc_size;
1199         atomic_inc(&bo->glob->bo_count);
1200
1201         ret = ttm_bo_check_placement(bo, placement);
1202         if (unlikely(ret != 0))
1203                 goto out_err;
1204
1205         /*
1206          * For ttm_bo_type_device buffers, allocate
1207          * address space from the device.
1208          */
1209         if (bo->type == ttm_bo_type_device) {
1210                 ret = ttm_bo_setup_vm(bo);
1211                 if (ret)
1212                         goto out_err;
1213         }
1214
1215         ret = ttm_bo_validate(bo, placement, interruptible, false, false);
1216         if (ret)
1217                 goto out_err;
1218
1219         ttm_bo_unreserve(bo);
1220         return 0;
1221
1222 out_err:
1223         ttm_bo_unreserve(bo);
1224         ttm_bo_unref(&bo);
1225
1226         return ret;
1227 }
1228 EXPORT_SYMBOL(ttm_bo_init);
1229
1230 static inline size_t ttm_bo_size(struct ttm_bo_global *glob,
1231                                  unsigned long num_pages)
1232 {
1233         size_t page_array_size = (num_pages * sizeof(void *) + PAGE_SIZE - 1) &
1234             PAGE_MASK;
1235
1236         return glob->ttm_bo_size + 2 * page_array_size;
1237 }
1238
1239 int ttm_bo_create(struct ttm_bo_device *bdev,
1240                         unsigned long size,
1241                         enum ttm_bo_type type,
1242                         struct ttm_placement *placement,
1243                         uint32_t page_alignment,
1244                         unsigned long buffer_start,
1245                         bool interruptible,
1246                         struct file *persistent_swap_storage,
1247                         struct ttm_buffer_object **p_bo)
1248 {
1249         struct ttm_buffer_object *bo;
1250         struct ttm_mem_global *mem_glob = bdev->glob->mem_glob;
1251         int ret;
1252
1253         size_t acc_size =
1254             ttm_bo_size(bdev->glob, (size + PAGE_SIZE - 1) >> PAGE_SHIFT);
1255         ret = ttm_mem_global_alloc(mem_glob, acc_size, false, false);
1256         if (unlikely(ret != 0))
1257                 return ret;
1258
1259         bo = kzalloc(sizeof(*bo), GFP_KERNEL);
1260
1261         if (unlikely(bo == NULL)) {
1262                 ttm_mem_global_free(mem_glob, acc_size);
1263                 return -ENOMEM;
1264         }
1265
1266         ret = ttm_bo_init(bdev, bo, size, type, placement, page_alignment,
1267                                 buffer_start, interruptible,
1268                                 persistent_swap_storage, acc_size, NULL);
1269         if (likely(ret == 0))
1270                 *p_bo = bo;
1271
1272         return ret;
1273 }
1274 EXPORT_SYMBOL(ttm_bo_create);
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         BUG_ON(type >= TTM_NUM_MEM_TYPES);
1365         man = &bdev->man[type];
1366         BUG_ON(man->has_type);
1367         man->io_reserve_fastpath = true;
1368         man->use_io_reserve_lru = false;
1369         mutex_init(&man->io_reserve_mutex);
1370         INIT_LIST_HEAD(&man->io_reserve_lru);
1371
1372         ret = bdev->driver->init_mem_type(bdev, type, man);
1373         if (ret)
1374                 return ret;
1375         man->bdev = bdev;
1376
1377         ret = 0;
1378         if (type != TTM_PL_SYSTEM) {
1379                 ret = (*man->func->init)(man, p_size);
1380                 if (ret)
1381                         return ret;
1382         }
1383         man->has_type = true;
1384         man->use_type = true;
1385         man->size = p_size;
1386
1387         INIT_LIST_HEAD(&man->lru);
1388
1389         return 0;
1390 }
1391 EXPORT_SYMBOL(ttm_bo_init_mm);
1392
1393 static void ttm_bo_global_kobj_release(struct kobject *kobj)
1394 {
1395         struct ttm_bo_global *glob =
1396                 container_of(kobj, struct ttm_bo_global, kobj);
1397
1398         ttm_mem_unregister_shrink(glob->mem_glob, &glob->shrink);
1399         __free_page(glob->dummy_read_page);
1400         kfree(glob);
1401 }
1402
1403 void ttm_bo_global_release(struct drm_global_reference *ref)
1404 {
1405         struct ttm_bo_global *glob = ref->object;
1406
1407         kobject_del(&glob->kobj);
1408         kobject_put(&glob->kobj);
1409 }
1410 EXPORT_SYMBOL(ttm_bo_global_release);
1411
1412 int ttm_bo_global_init(struct drm_global_reference *ref)
1413 {
1414         struct ttm_bo_global_ref *bo_ref =
1415                 container_of(ref, struct ttm_bo_global_ref, ref);
1416         struct ttm_bo_global *glob = ref->object;
1417         int ret;
1418
1419         mutex_init(&glob->device_list_mutex);
1420         spin_lock_init(&glob->lru_lock);
1421         glob->mem_glob = bo_ref->mem_glob;
1422         glob->dummy_read_page = alloc_page(__GFP_ZERO | GFP_DMA32);
1423
1424         if (unlikely(glob->dummy_read_page == NULL)) {
1425                 ret = -ENOMEM;
1426                 goto out_no_drp;
1427         }
1428
1429         INIT_LIST_HEAD(&glob->swap_lru);
1430         INIT_LIST_HEAD(&glob->device_list);
1431
1432         ttm_mem_init_shrink(&glob->shrink, ttm_bo_swapout);
1433         ret = ttm_mem_register_shrink(glob->mem_glob, &glob->shrink);
1434         if (unlikely(ret != 0)) {
1435                 printk(KERN_ERR TTM_PFX
1436                        "Could not register buffer object swapout.\n");
1437                 goto out_no_shrink;
1438         }
1439
1440         glob->ttm_bo_extra_size =
1441                 ttm_round_pot(sizeof(struct ttm_tt)) +
1442                 ttm_round_pot(sizeof(struct ttm_backend));
1443
1444         glob->ttm_bo_size = glob->ttm_bo_extra_size +
1445                 ttm_round_pot(sizeof(struct ttm_buffer_object));
1446
1447         atomic_set(&glob->bo_count, 0);
1448
1449         ret = kobject_init_and_add(
1450                 &glob->kobj, &ttm_bo_glob_kobj_type, ttm_get_kobj(), "buffer_objects");
1451         if (unlikely(ret != 0))
1452                 kobject_put(&glob->kobj);
1453         return ret;
1454 out_no_shrink:
1455         __free_page(glob->dummy_read_page);
1456 out_no_drp:
1457         kfree(glob);
1458         return ret;
1459 }
1460 EXPORT_SYMBOL(ttm_bo_global_init);
1461
1462
1463 int ttm_bo_device_release(struct ttm_bo_device *bdev)
1464 {
1465         int ret = 0;
1466         unsigned i = TTM_NUM_MEM_TYPES;
1467         struct ttm_mem_type_manager *man;
1468         struct ttm_bo_global *glob = bdev->glob;
1469
1470         while (i--) {
1471                 man = &bdev->man[i];
1472                 if (man->has_type) {
1473                         man->use_type = false;
1474                         if ((i != TTM_PL_SYSTEM) && ttm_bo_clean_mm(bdev, i)) {
1475                                 ret = -EBUSY;
1476                                 printk(KERN_ERR TTM_PFX
1477                                        "DRM memory manager type %d "
1478                                        "is not clean.\n", i);
1479                         }
1480                         man->has_type = false;
1481                 }
1482         }
1483
1484         mutex_lock(&glob->device_list_mutex);
1485         list_del(&bdev->device_list);
1486         mutex_unlock(&glob->device_list_mutex);
1487
1488         cancel_delayed_work_sync(&bdev->wq);
1489
1490         while (ttm_bo_delayed_delete(bdev, true))
1491                 ;
1492
1493         spin_lock(&glob->lru_lock);
1494         if (list_empty(&bdev->ddestroy))
1495                 TTM_DEBUG("Delayed destroy list was clean\n");
1496
1497         if (list_empty(&bdev->man[0].lru))
1498                 TTM_DEBUG("Swap list was clean\n");
1499         spin_unlock(&glob->lru_lock);
1500
1501         BUG_ON(!drm_mm_clean(&bdev->addr_space_mm));
1502         write_lock(&bdev->vm_lock);
1503         drm_mm_takedown(&bdev->addr_space_mm);
1504         write_unlock(&bdev->vm_lock);
1505
1506         return ret;
1507 }
1508 EXPORT_SYMBOL(ttm_bo_device_release);
1509
1510 int ttm_bo_device_init(struct ttm_bo_device *bdev,
1511                        struct ttm_bo_global *glob,
1512                        struct ttm_bo_driver *driver,
1513                        uint64_t file_page_offset,
1514                        bool need_dma32)
1515 {
1516         int ret = -EINVAL;
1517
1518         rwlock_init(&bdev->vm_lock);
1519         bdev->driver = driver;
1520
1521         memset(bdev->man, 0, sizeof(bdev->man));
1522
1523         /*
1524          * Initialize the system memory buffer type.
1525          * Other types need to be driver / IOCTL initialized.
1526          */
1527         ret = ttm_bo_init_mm(bdev, TTM_PL_SYSTEM, 0);
1528         if (unlikely(ret != 0))
1529                 goto out_no_sys;
1530
1531         bdev->addr_space_rb = RB_ROOT;
1532         ret = drm_mm_init(&bdev->addr_space_mm, file_page_offset, 0x10000000);
1533         if (unlikely(ret != 0))
1534                 goto out_no_addr_mm;
1535
1536         INIT_DELAYED_WORK(&bdev->wq, ttm_bo_delayed_workqueue);
1537         bdev->nice_mode = true;
1538         INIT_LIST_HEAD(&bdev->ddestroy);
1539         bdev->dev_mapping = NULL;
1540         bdev->glob = glob;
1541         bdev->need_dma32 = need_dma32;
1542         bdev->val_seq = 0;
1543         spin_lock_init(&bdev->fence_lock);
1544         mutex_lock(&glob->device_list_mutex);
1545         list_add_tail(&bdev->device_list, &glob->device_list);
1546         mutex_unlock(&glob->device_list_mutex);
1547
1548         return 0;
1549 out_no_addr_mm:
1550         ttm_bo_clean_mm(bdev, 0);
1551 out_no_sys:
1552         return ret;
1553 }
1554 EXPORT_SYMBOL(ttm_bo_device_init);
1555
1556 /*
1557  * buffer object vm functions.
1558  */
1559
1560 bool ttm_mem_reg_is_pci(struct ttm_bo_device *bdev, struct ttm_mem_reg *mem)
1561 {
1562         struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
1563
1564         if (!(man->flags & TTM_MEMTYPE_FLAG_FIXED)) {
1565                 if (mem->mem_type == TTM_PL_SYSTEM)
1566                         return false;
1567
1568                 if (man->flags & TTM_MEMTYPE_FLAG_CMA)
1569                         return false;
1570
1571                 if (mem->placement & TTM_PL_FLAG_CACHED)
1572                         return false;
1573         }
1574         return true;
1575 }
1576
1577 void ttm_bo_unmap_virtual_locked(struct ttm_buffer_object *bo)
1578 {
1579         struct ttm_bo_device *bdev = bo->bdev;
1580         loff_t offset = (loff_t) bo->addr_space_offset;
1581         loff_t holelen = ((loff_t) bo->mem.num_pages) << PAGE_SHIFT;
1582
1583         if (!bdev->dev_mapping)
1584                 return;
1585         unmap_mapping_range(bdev->dev_mapping, offset, holelen, 1);
1586         ttm_mem_io_free_vm(bo);
1587 }
1588
1589 void ttm_bo_unmap_virtual(struct ttm_buffer_object *bo)
1590 {
1591         struct ttm_bo_device *bdev = bo->bdev;
1592         struct ttm_mem_type_manager *man = &bdev->man[bo->mem.mem_type];
1593
1594         ttm_mem_io_lock(man, false);
1595         ttm_bo_unmap_virtual_locked(bo);
1596         ttm_mem_io_unlock(man);
1597 }
1598
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         struct ttm_bo_device *bdev = bo->bdev;
1680         void *sync_obj;
1681         void *sync_obj_arg;
1682         int ret = 0;
1683
1684         if (likely(bo->sync_obj == NULL))
1685                 return 0;
1686
1687         while (bo->sync_obj) {
1688
1689                 if (driver->sync_obj_signaled(bo->sync_obj, bo->sync_obj_arg)) {
1690                         void *tmp_obj = bo->sync_obj;
1691                         bo->sync_obj = NULL;
1692                         clear_bit(TTM_BO_PRIV_FLAG_MOVING, &bo->priv_flags);
1693                         spin_unlock(&bdev->fence_lock);
1694                         driver->sync_obj_unref(&tmp_obj);
1695                         spin_lock(&bdev->fence_lock);
1696                         continue;
1697                 }
1698
1699                 if (no_wait)
1700                         return -EBUSY;
1701
1702                 sync_obj = driver->sync_obj_ref(bo->sync_obj);
1703                 sync_obj_arg = bo->sync_obj_arg;
1704                 spin_unlock(&bdev->fence_lock);
1705                 ret = driver->sync_obj_wait(sync_obj, sync_obj_arg,
1706                                             lazy, interruptible);
1707                 if (unlikely(ret != 0)) {
1708                         driver->sync_obj_unref(&sync_obj);
1709                         spin_lock(&bdev->fence_lock);
1710                         return ret;
1711                 }
1712                 spin_lock(&bdev->fence_lock);
1713                 if (likely(bo->sync_obj == sync_obj &&
1714                            bo->sync_obj_arg == sync_obj_arg)) {
1715                         void *tmp_obj = bo->sync_obj;
1716                         bo->sync_obj = NULL;
1717                         clear_bit(TTM_BO_PRIV_FLAG_MOVING,
1718                                   &bo->priv_flags);
1719                         spin_unlock(&bdev->fence_lock);
1720                         driver->sync_obj_unref(&sync_obj);
1721                         driver->sync_obj_unref(&tmp_obj);
1722                         spin_lock(&bdev->fence_lock);
1723                 } else {
1724                         spin_unlock(&bdev->fence_lock);
1725                         driver->sync_obj_unref(&sync_obj);
1726                         spin_lock(&bdev->fence_lock);
1727                 }
1728         }
1729         return 0;
1730 }
1731 EXPORT_SYMBOL(ttm_bo_wait);
1732
1733 int ttm_bo_synccpu_write_grab(struct ttm_buffer_object *bo, bool no_wait)
1734 {
1735         struct ttm_bo_device *bdev = bo->bdev;
1736         int ret = 0;
1737
1738         /*
1739          * Using ttm_bo_reserve makes sure the lru lists are updated.
1740          */
1741
1742         ret = ttm_bo_reserve(bo, true, no_wait, false, 0);
1743         if (unlikely(ret != 0))
1744                 return ret;
1745         spin_lock(&bdev->fence_lock);
1746         ret = ttm_bo_wait(bo, false, true, no_wait);
1747         spin_unlock(&bdev->fence_lock);
1748         if (likely(ret == 0))
1749                 atomic_inc(&bo->cpu_writers);
1750         ttm_bo_unreserve(bo);
1751         return ret;
1752 }
1753 EXPORT_SYMBOL(ttm_bo_synccpu_write_grab);
1754
1755 void ttm_bo_synccpu_write_release(struct ttm_buffer_object *bo)
1756 {
1757         if (atomic_dec_and_test(&bo->cpu_writers))
1758                 wake_up_all(&bo->event_queue);
1759 }
1760 EXPORT_SYMBOL(ttm_bo_synccpu_write_release);
1761
1762 /**
1763  * A buffer object shrink method that tries to swap out the first
1764  * buffer object on the bo_global::swap_lru list.
1765  */
1766
1767 static int ttm_bo_swapout(struct ttm_mem_shrink *shrink)
1768 {
1769         struct ttm_bo_global *glob =
1770             container_of(shrink, struct ttm_bo_global, shrink);
1771         struct ttm_buffer_object *bo;
1772         int ret = -EBUSY;
1773         int put_count;
1774         uint32_t swap_placement = (TTM_PL_FLAG_CACHED | TTM_PL_FLAG_SYSTEM);
1775
1776         spin_lock(&glob->lru_lock);
1777         while (ret == -EBUSY) {
1778                 if (unlikely(list_empty(&glob->swap_lru))) {
1779                         spin_unlock(&glob->lru_lock);
1780                         return -EBUSY;
1781                 }
1782
1783                 bo = list_first_entry(&glob->swap_lru,
1784                                       struct ttm_buffer_object, swap);
1785                 kref_get(&bo->list_kref);
1786
1787                 if (!list_empty(&bo->ddestroy)) {
1788                         spin_unlock(&glob->lru_lock);
1789                         (void) ttm_bo_cleanup_refs(bo, false, false, false);
1790                         kref_put(&bo->list_kref, ttm_bo_release_list);
1791                         continue;
1792                 }
1793
1794                 /**
1795                  * Reserve buffer. Since we unlock while sleeping, we need
1796                  * to re-check that nobody removed us from the swap-list while
1797                  * we slept.
1798                  */
1799
1800                 ret = ttm_bo_reserve_locked(bo, false, true, false, 0);
1801                 if (unlikely(ret == -EBUSY)) {
1802                         spin_unlock(&glob->lru_lock);
1803                         ttm_bo_wait_unreserved(bo, false);
1804                         kref_put(&bo->list_kref, ttm_bo_release_list);
1805                         spin_lock(&glob->lru_lock);
1806                 }
1807         }
1808
1809         BUG_ON(ret != 0);
1810         put_count = ttm_bo_del_from_lru(bo);
1811         spin_unlock(&glob->lru_lock);
1812
1813         ttm_bo_list_ref_sub(bo, put_count, true);
1814
1815         /**
1816          * Wait for GPU, then move to system cached.
1817          */
1818
1819         spin_lock(&bo->bdev->fence_lock);
1820         ret = ttm_bo_wait(bo, false, false, false);
1821         spin_unlock(&bo->bdev->fence_lock);
1822
1823         if (unlikely(ret != 0))
1824                 goto out;
1825
1826         if ((bo->mem.placement & swap_placement) != swap_placement) {
1827                 struct ttm_mem_reg evict_mem;
1828
1829                 evict_mem = bo->mem;
1830                 evict_mem.mm_node = NULL;
1831                 evict_mem.placement = TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED;
1832                 evict_mem.mem_type = TTM_PL_SYSTEM;
1833
1834                 ret = ttm_bo_handle_move_mem(bo, &evict_mem, true,
1835                                              false, false, false);
1836                 if (unlikely(ret != 0))
1837                         goto out;
1838         }
1839
1840         ttm_bo_unmap_virtual(bo);
1841
1842         /**
1843          * Swap out. Buffer will be swapped in again as soon as
1844          * anyone tries to access a ttm page.
1845          */
1846
1847         if (bo->bdev->driver->swap_notify)
1848                 bo->bdev->driver->swap_notify(bo);
1849
1850         ret = ttm_tt_swapout(bo->ttm, bo->persistent_swap_storage);
1851 out:
1852
1853         /**
1854          *
1855          * Unreserve without putting on LRU to avoid swapping out an
1856          * already swapped buffer.
1857          */
1858
1859         atomic_set(&bo->reserved, 0);
1860         wake_up_all(&bo->event_queue);
1861         kref_put(&bo->list_kref, ttm_bo_release_list);
1862         return ret;
1863 }
1864
1865 void ttm_bo_swapout_all(struct ttm_bo_device *bdev)
1866 {
1867         while (ttm_bo_swapout(&bdev->glob->shrink) == 0)
1868                 ;
1869 }
1870 EXPORT_SYMBOL(ttm_bo_swapout_all);