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 /* Notes:
  31  *
  32  * We store bo pointer in drm_mm_node struct so we know which bo own a
  33  * specific node. There is no protection on the pointer, thus to make
  34  * sure things don't go berserk you have to access this pointer while
  35  * holding the global lru lock and make sure anytime you free a node you
  36  * reset the pointer to NULL.
  37  */
  38
  39 #include "ttm/ttm_module.h"
  40 #include "ttm/ttm_bo_driver.h"
  41 #include "ttm/ttm_placement.h"
  42 #include <linux/jiffies.h>
  43 #include <linux/slab.h>
  44 #include <linux/sched.h>
  45 #include <linux/mm.h>
  46 #include <linux/file.h>
  47 #include <linux/module.h>
  48
  49 #define TTM_ASSERT_LOCKED(param)
  50 #define TTM_DEBUG(fmt, arg...)
  51 #define TTM_BO_HASH_ORDER 13
  52
  53 static int ttm_bo_setup_vm(struct ttm_buffer_object *bo);
  54 static int ttm_bo_swapout(struct ttm_mem_shrink *shrink);
  55 static void ttm_bo_global_kobj_release(struct kobject *kobj);
  56
  57 static struct attribute ttm_bo_count = {
  58         .name = "bo_count",
  59         .mode = S_IRUGO
  60 };
  61
  62 static inline int ttm_mem_type_from_flags(uint32_t flags, uint32_t *mem_type)
  63 {
  64         int i;
  65
  66         for (i = 0; i <= TTM_PL_PRIV5; i++)
  67                 if (flags & (1 << i)) {
  68                         *mem_type = i;
  69                         return 0;
  70                 }
  71         return -EINVAL;
  72 }
  73
  74 static void ttm_mem_type_debug(struct ttm_bo_device *bdev, int mem_type)
  75 {
  76         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
  77
  78         printk(KERN_ERR TTM_PFX "    has_type: %d\n", man->has_type);
  79         printk(KERN_ERR TTM_PFX "    use_type: %d\n", man->use_type);
  80         printk(KERN_ERR TTM_PFX "    flags: 0x%08X\n", man->flags);
  81         printk(KERN_ERR TTM_PFX "    gpu_offset: 0x%08lX\n", man->gpu_offset);
  82         printk(KERN_ERR TTM_PFX "    size: %llu\n", man->size);
  83         printk(KERN_ERR TTM_PFX "    available_caching: 0x%08X\n",
  84                 man->available_caching);
  85         printk(KERN_ERR TTM_PFX "    default_caching: 0x%08X\n",
  86                 man->default_caching);
  87         if (mem_type != TTM_PL_SYSTEM) {
  88                 spin_lock(&bdev->glob->lru_lock);
  89                 drm_mm_debug_table(&man->manager, TTM_PFX);
  90                 spin_unlock(&bdev->glob->lru_lock);
  91         }
  92 }
  93
  94 static void ttm_bo_mem_space_debug(struct ttm_buffer_object *bo,
  95                                         struct ttm_placement *placement)
  96 {
  97         int i, ret, mem_type;
  98
  99         printk(KERN_ERR TTM_PFX "No space for %p (%lu pages, %luK, %luM)\n",
 100                 bo, bo->mem.num_pages, bo->mem.size >> 10,
 101                 bo->mem.size >> 20);
 102         for (i = 0; i < placement->num_placement; i++) {
 103                 ret = ttm_mem_type_from_flags(placement->placement[i],
 104                                                 &mem_type);
 105                 if (ret)
 106                         return;
 107                 printk(KERN_ERR TTM_PFX "  placement[%d]=0x%08X (%d)\n",
 108                         i, placement->placement[i], mem_type);
 109                 ttm_mem_type_debug(bo->bdev, mem_type);
 110         }
 111 }
 112
 113 static ssize_t ttm_bo_global_show(struct kobject *kobj,
 114                                   struct attribute *attr,
 115                                   char *buffer)
 116 {
 117         struct ttm_bo_global *glob =
 118                 container_of(kobj, struct ttm_bo_global, kobj);
 119
 120         return snprintf(buffer, PAGE_SIZE, "%lu\n",
 121                         (unsigned long) atomic_read(&glob->bo_count));
 122 }
 123
 124 static struct attribute *ttm_bo_global_attrs[] = {
 125         &ttm_bo_count,
 126         NULL
 127 };
 128
 129 static const struct sysfs_ops ttm_bo_global_ops = {
 130         .show = &ttm_bo_global_show
 131 };
 132
 133 static struct kobj_type ttm_bo_glob_kobj_type  = {
 134         .release = &ttm_bo_global_kobj_release,
 135         .sysfs_ops = &ttm_bo_global_ops,
 136         .default_attrs = ttm_bo_global_attrs
 137 };
 138
 139
 140 static inline uint32_t ttm_bo_type_flags(unsigned type)
 141 {
 142         return 1 << (type);
 143 }
 144
 145 static void ttm_bo_release_list(struct kref *list_kref)
 146 {
 147         struct ttm_buffer_object *bo =
 148             container_of(list_kref, struct ttm_buffer_object, list_kref);
 149         struct ttm_bo_device *bdev = bo->bdev;
 150
 151         BUG_ON(atomic_read(&bo->list_kref.refcount));
 152         BUG_ON(atomic_read(&bo->kref.refcount));
 153         BUG_ON(atomic_read(&bo->cpu_writers));
 154         BUG_ON(bo->sync_obj != NULL);
 155         BUG_ON(bo->mem.mm_node != NULL);
 156         BUG_ON(!list_empty(&bo->lru));
 157         BUG_ON(!list_empty(&bo->ddestroy));
 158
 159         if (bo->ttm)
 160                 ttm_tt_destroy(bo->ttm);
 161         atomic_dec(&bo->glob->bo_count);
 162         if (bo->destroy)
 163                 bo->destroy(bo);
 164         else {
 165                 ttm_mem_global_free(bdev->glob->mem_glob, bo->acc_size);
 166                 kfree(bo);
 167         }
 168 }
 169
 170 int ttm_bo_wait_unreserved(struct ttm_buffer_object *bo, bool interruptible)
 171 {
 172
 173         if (interruptible) {
 174                 int ret = 0;
 175
 176                 ret = wait_event_interruptible(bo->event_queue,
 177                                                atomic_read(&bo->reserved) == 0);
 178                 if (unlikely(ret != 0))
 179                         return ret;
 180         } else {
 181                 wait_event(bo->event_queue, atomic_read(&bo->reserved) == 0);
 182         }
 183         return 0;
 184 }
 185 EXPORT_SYMBOL(ttm_bo_wait_unreserved);
 186
 187 static void ttm_bo_add_to_lru(struct ttm_buffer_object *bo)
 188 {
 189         struct ttm_bo_device *bdev = bo->bdev;
 190         struct ttm_mem_type_manager *man;
 191
 192         BUG_ON(!atomic_read(&bo->reserved));
 193
 194         if (!(bo->mem.placement & TTM_PL_FLAG_NO_EVICT)) {
 195
 196                 BUG_ON(!list_empty(&bo->lru));
 197
 198                 man = &bdev->man[bo->mem.mem_type];
 199                 list_add_tail(&bo->lru, &man->lru);
 200                 kref_get(&bo->list_kref);
 201
 202                 if (bo->ttm != NULL) {
 203                         list_add_tail(&bo->swap, &bo->glob->swap_lru);
 204                         kref_get(&bo->list_kref);
 205                 }
 206         }
 207 }
 208
 209 /**
 210  * Call with the lru_lock held.
 211  */
 212
 213 static int ttm_bo_del_from_lru(struct ttm_buffer_object *bo)
 214 {
 215         int put_count = 0;
 216
 217         if (!list_empty(&bo->swap)) {
 218                 list_del_init(&bo->swap);
 219                 ++put_count;
 220         }
 221         if (!list_empty(&bo->lru)) {
 222                 list_del_init(&bo->lru);
 223                 ++put_count;
 224         }
 225
 226         /*
 227          * TODO: Add a driver hook to delete from
 228          * driver-specific LRU's here.
 229          */
 230
 231         return put_count;
 232 }
 233
 234 int ttm_bo_reserve_locked(struct ttm_buffer_object *bo,
 235                           bool interruptible,
 236                           bool no_wait, bool use_sequence, uint32_t sequence)
 237 {
 238         struct ttm_bo_global *glob = bo->glob;
 239         int ret;
 240
 241         while (unlikely(atomic_cmpxchg(&bo->reserved, 0, 1) != 0)) {
 242                 if (use_sequence && bo->seq_valid &&
 243                         (sequence - bo->val_seq < (1 << 31))) {
 244                         return -EAGAIN;
 245                 }
 246
 247                 if (no_wait)
 248                         return -EBUSY;
 249
 250                 spin_unlock(&glob->lru_lock);
 251                 ret = ttm_bo_wait_unreserved(bo, interruptible);
 252                 spin_lock(&glob->lru_lock);
 253
 254                 if (unlikely(ret))
 255                         return ret;
 256         }
 257
 258         if (use_sequence) {
 259                 bo->val_seq = sequence;
 260                 bo->seq_valid = true;
 261         } else {
 262                 bo->seq_valid = false;
 263         }
 264
 265         return 0;
 266 }
 267 EXPORT_SYMBOL(ttm_bo_reserve);
 268
 269 static void ttm_bo_ref_bug(struct kref *list_kref)
 270 {
 271         BUG();
 272 }
 273
 274 int ttm_bo_reserve(struct ttm_buffer_object *bo,
 275                    bool interruptible,
 276                    bool no_wait, bool use_sequence, uint32_t sequence)
 277 {
 278         struct ttm_bo_global *glob = bo->glob;
 279         int put_count = 0;
 280         int ret;
 281
 282         spin_lock(&glob->lru_lock);
 283         ret = ttm_bo_reserve_locked(bo, interruptible, no_wait, use_sequence,
 284                                     sequence);
 285         if (likely(ret == 0))
 286                 put_count = ttm_bo_del_from_lru(bo);
 287         spin_unlock(&glob->lru_lock);
 288
 289         while (put_count--)
 290                 kref_put(&bo->list_kref, ttm_bo_ref_bug);
 291
 292         return ret;
 293 }
 294
 295 void ttm_bo_unreserve(struct ttm_buffer_object *bo)
 296 {
 297         struct ttm_bo_global *glob = bo->glob;
 298
 299         spin_lock(&glob->lru_lock);
 300         ttm_bo_add_to_lru(bo);
 301         atomic_set(&bo->reserved, 0);
 302         wake_up_all(&bo->event_queue);
 303         spin_unlock(&glob->lru_lock);
 304 }
 305 EXPORT_SYMBOL(ttm_bo_unreserve);
 306
 307 /*
 308  * Call bo->mutex locked.
 309  */
 310 static int ttm_bo_add_ttm(struct ttm_buffer_object *bo, bool zero_alloc)
 311 {
 312         struct ttm_bo_device *bdev = bo->bdev;
 313         struct ttm_bo_global *glob = bo->glob;
 314         int ret = 0;
 315         uint32_t page_flags = 0;
 316
 317         TTM_ASSERT_LOCKED(&bo->mutex);
 318         bo->ttm = NULL;
 319
 320         if (bdev->need_dma32)
 321                 page_flags |= TTM_PAGE_FLAG_DMA32;
 322
 323         switch (bo->type) {
 324         case ttm_bo_type_device:
 325                 if (zero_alloc)
 326                         page_flags |= TTM_PAGE_FLAG_ZERO_ALLOC;
 327         case ttm_bo_type_kernel:
 328                 bo->ttm = ttm_tt_create(bdev, bo->num_pages << PAGE_SHIFT,
 329                                         page_flags, glob->dummy_read_page);
 330                 if (unlikely(bo->ttm == NULL))
 331                         ret = -ENOMEM;
 332                 break;
 333         case ttm_bo_type_user:
 334                 bo->ttm = ttm_tt_create(bdev, bo->num_pages << PAGE_SHIFT,
 335                                         page_flags | TTM_PAGE_FLAG_USER,
 336                                         glob->dummy_read_page);
 337                 if (unlikely(bo->ttm == NULL)) {
 338                         ret = -ENOMEM;
 339                         break;
 340                 }
 341
 342                 ret = ttm_tt_set_user(bo->ttm, current,
 343                                       bo->buffer_start, bo->num_pages);
 344                 if (unlikely(ret != 0))
 345                         ttm_tt_destroy(bo->ttm);
 346                 break;
 347         default:
 348                 printk(KERN_ERR TTM_PFX "Illegal buffer object type\n");
 349                 ret = -EINVAL;
 350                 break;
 351         }
 352
 353         return ret;
 354 }
 355
 356 static int ttm_bo_handle_move_mem(struct ttm_buffer_object *bo,
 357                                   struct ttm_mem_reg *mem,
 358                                   bool evict, bool interruptible,
 359                                   bool no_wait_reserve, bool no_wait_gpu)
 360 {
 361         struct ttm_bo_device *bdev = bo->bdev;
 362         bool old_is_pci = ttm_mem_reg_is_pci(bdev, &bo->mem);
 363         bool new_is_pci = ttm_mem_reg_is_pci(bdev, mem);
 364         struct ttm_mem_type_manager *old_man = &bdev->man[bo->mem.mem_type];
 365         struct ttm_mem_type_manager *new_man = &bdev->man[mem->mem_type];
 366         int ret = 0;
 367
 368         if (old_is_pci || new_is_pci ||
 369             ((mem->placement & bo->mem.placement & TTM_PL_MASK_CACHING) == 0))
 370                 ttm_bo_unmap_virtual(bo);
 371
 372         /*
 373          * Create and bind a ttm if required.
 374          */
 375
 376         if (!(new_man->flags & TTM_MEMTYPE_FLAG_FIXED) && (bo->ttm == NULL)) {
 377                 ret = ttm_bo_add_ttm(bo, false);
 378                 if (ret)
 379                         goto out_err;
 380
 381                 ret = ttm_tt_set_placement_caching(bo->ttm, mem->placement);
 382                 if (ret)
 383                         goto out_err;
 384
 385                 if (mem->mem_type != TTM_PL_SYSTEM) {
 386                         ret = ttm_tt_bind(bo->ttm, mem);
 387                         if (ret)
 388                                 goto out_err;
 389                 }
 390
 391                 if (bo->mem.mem_type == TTM_PL_SYSTEM) {
 392                         bo->mem = *mem;
 393                         mem->mm_node = NULL;
 394                         goto moved;
 395                 }
 396
 397         }
 398
 399         if (bdev->driver->move_notify)
 400                 bdev->driver->move_notify(bo, mem);
 401
 402         if (!(old_man->flags & TTM_MEMTYPE_FLAG_FIXED) &&
 403             !(new_man->flags & TTM_MEMTYPE_FLAG_FIXED))
 404                 ret = ttm_bo_move_ttm(bo, evict, no_wait_reserve, no_wait_gpu, mem);
 405         else if (bdev->driver->move)
 406                 ret = bdev->driver->move(bo, evict, interruptible,
 407                                          no_wait_reserve, no_wait_gpu, mem);
 408         else
 409                 ret = ttm_bo_move_memcpy(bo, evict, no_wait_reserve, no_wait_gpu, mem);
 410
 411         if (ret)
 412                 goto out_err;
 413
 414 moved:
 415         if (bo->evicted) {
 416                 ret = bdev->driver->invalidate_caches(bdev, bo->mem.placement);
 417                 if (ret)
 418                         printk(KERN_ERR TTM_PFX "Can not flush read caches\n");
 419                 bo->evicted = false;
 420         }
 421
 422         if (bo->mem.mm_node) {
 423                 spin_lock(&bo->lock);
 424                 bo->offset = (bo->mem.mm_node->start << PAGE_SHIFT) +
 425                     bdev->man[bo->mem.mem_type].gpu_offset;
 426                 bo->cur_placement = bo->mem.placement;
 427                 spin_unlock(&bo->lock);
 428         } else
 429                 bo->offset = 0;
 430
 431         return 0;
 432
 433 out_err:
 434         new_man = &bdev->man[bo->mem.mem_type];
 435         if ((new_man->flags & TTM_MEMTYPE_FLAG_FIXED) && bo->ttm) {
 436                 ttm_tt_unbind(bo->ttm);
 437                 ttm_tt_destroy(bo->ttm);
 438                 bo->ttm = NULL;
 439         }
 440
 441         return ret;
 442 }
 443
 444 /**
 445  * Call bo::reserved and with the lru lock held.
 446  * Will release GPU memory type usage on destruction.
 447  * This is the place to put in driver specific hooks.
 448  * Will release the bo::reserved lock and the
 449  * lru lock on exit.
 450  */
 451
 452 static void ttm_bo_cleanup_memtype_use(struct ttm_buffer_object *bo)
 453 {
 454         struct ttm_bo_global *glob = bo->glob;
 455
 456         if (bo->ttm) {
 457
 458                 /**
 459                  * Release the lru_lock, since we don't want to have
 460                  * an atomic requirement on ttm_tt[unbind|destroy].
 461                  */
 462
 463                 spin_unlock(&glob->lru_lock);
 464                 ttm_tt_unbind(bo->ttm);
 465                 ttm_tt_destroy(bo->ttm);
 466                 bo->ttm = NULL;
 467                 spin_lock(&glob->lru_lock);
 468         }
 469
 470         if (bo->mem.mm_node) {
 471                 drm_mm_put_block(bo->mem.mm_node);
 472                 bo->mem.mm_node = NULL;
 473         }
 474
 475         atomic_set(&bo->reserved, 0);
 476         wake_up_all(&bo->event_queue);
 477         spin_unlock(&glob->lru_lock);
 478 }
 479
 480
 481 /**
 482  * If bo idle, remove from delayed- and lru lists, and unref.
 483  * If not idle, and already on delayed list, do nothing.
 484  * If not idle, and not on delayed list, put on delayed list,
 485  *   up the list_kref and schedule a delayed list check.
 486  */
 487
 488 static int ttm_bo_cleanup_refs(struct ttm_buffer_object *bo, bool remove_all)
 489 {
 490         struct ttm_bo_device *bdev = bo->bdev;
 491         struct ttm_bo_global *glob = bo->glob;
 492         struct ttm_bo_driver *driver = bdev->driver;
 493         int ret;
 494
 495         spin_lock(&bo->lock);
 496 retry:
 497         (void) ttm_bo_wait(bo, false, false, !remove_all);
 498
 499         if (!bo->sync_obj) {
 500                 int put_count;
 501
 502                 spin_unlock(&bo->lock);
 503
 504                 spin_lock(&glob->lru_lock);
 505                 ret = ttm_bo_reserve_locked(bo, false, !remove_all, false, 0);
 506
 507                 /**
 508                  * Someone else has the object reserved. Bail and retry.
 509                  */
 510
 511                 if (unlikely(ret == -EBUSY)) {
 512                         spin_unlock(&glob->lru_lock);
 513                         spin_lock(&bo->lock);
 514                         goto requeue;
 515                 }
 516
 517                 /**
 518                  * We can re-check for sync object without taking
 519                  * the bo::lock since setting the sync object requires
 520                  * also bo::reserved. A busy object at this point may
 521                  * be caused by another thread starting an accelerated
 522                  * eviction.
 523                  */
 524
 525                 if (unlikely(bo->sync_obj)) {
 526                         atomic_set(&bo->reserved, 0);
 527                         wake_up_all(&bo->event_queue);
 528                         spin_unlock(&glob->lru_lock);
 529                         spin_lock(&bo->lock);
 530                         if (remove_all)
 531                                 goto retry;
 532                         else
 533                                 goto requeue;
 534                 }
 535
 536                 put_count = ttm_bo_del_from_lru(bo);
 537
 538                 if (!list_empty(&bo->ddestroy)) {
 539                         list_del_init(&bo->ddestroy);
 540                         ++put_count;
 541                 }
 542
 543                 ttm_bo_cleanup_memtype_use(bo);
 544
 545                 while (put_count--)
 546                         kref_put(&bo->list_kref, ttm_bo_ref_bug);
 547
 548                 return 0;
 549         }
 550 requeue:
 551         spin_lock(&glob->lru_lock);
 552         if (list_empty(&bo->ddestroy)) {
 553                 void *sync_obj = bo->sync_obj;
 554                 void *sync_obj_arg = bo->sync_obj_arg;
 555
 556                 kref_get(&bo->list_kref);
 557                 list_add_tail(&bo->ddestroy, &bdev->ddestroy);
 558                 spin_unlock(&glob->lru_lock);
 559                 spin_unlock(&bo->lock);
 560
 561                 if (sync_obj)
 562                         driver->sync_obj_flush(sync_obj, sync_obj_arg);
 563                 schedule_delayed_work(&bdev->wq,
 564                                       ((HZ / 100) < 1) ? 1 : HZ / 100);
 565                 ret = 0;
 566
 567         } else {
 568                 spin_unlock(&glob->lru_lock);
 569                 spin_unlock(&bo->lock);
 570                 ret = -EBUSY;
 571         }
 572
 573         return ret;
 574 }
 575
 576 /**
 577  * Traverse the delayed list, and call ttm_bo_cleanup_refs on all
 578  * encountered buffers.
 579  */
 580
 581 static int ttm_bo_delayed_delete(struct ttm_bo_device *bdev, bool remove_all)
 582 {
 583         struct ttm_bo_global *glob = bdev->glob;
 584         struct ttm_buffer_object *entry = NULL;
 585         int ret = 0;
 586
 587         spin_lock(&glob->lru_lock);
 588         if (list_empty(&bdev->ddestroy))
 589                 goto out_unlock;
 590
 591         entry = list_first_entry(&bdev->ddestroy,
 592                 struct ttm_buffer_object, ddestroy);
 593         kref_get(&entry->list_kref);
 594
 595         for (;;) {
 596                 struct ttm_buffer_object *nentry = NULL;
 597
 598                 if (entry->ddestroy.next != &bdev->ddestroy) {
 599                         nentry = list_first_entry(&entry->ddestroy,
 600                                 struct ttm_buffer_object, ddestroy);
 601                         kref_get(&nentry->list_kref);
 602                 }
 603
 604                 spin_unlock(&glob->lru_lock);
 605                 ret = ttm_bo_cleanup_refs(entry, remove_all);
 606                 kref_put(&entry->list_kref, ttm_bo_release_list);
 607                 entry = nentry;
 608
 609                 if (ret || !entry)
 610                         goto out;
 611
 612                 spin_lock(&glob->lru_lock);
 613                 if (list_empty(&entry->ddestroy))
 614                         break;
 615         }
 616
 617 out_unlock:
 618         spin_unlock(&glob->lru_lock);
 619 out:
 620         if (entry)
 621                 kref_put(&entry->list_kref, ttm_bo_release_list);
 622         return ret;
 623 }
 624
 625 static void ttm_bo_delayed_workqueue(struct work_struct *work)
 626 {
 627         struct ttm_bo_device *bdev =
 628             container_of(work, struct ttm_bo_device, wq.work);
 629
 630         if (ttm_bo_delayed_delete(bdev, false)) {
 631                 schedule_delayed_work(&bdev->wq,
 632                                       ((HZ / 100) < 1) ? 1 : HZ / 100);
 633         }
 634 }
 635
 636 static void ttm_bo_release(struct kref *kref)
 637 {
 638         struct ttm_buffer_object *bo =
 639             container_of(kref, struct ttm_buffer_object, kref);
 640         struct ttm_bo_device *bdev = bo->bdev;
 641
 642         if (likely(bo->vm_node != NULL)) {
 643                 rb_erase(&bo->vm_rb, &bdev->addr_space_rb);
 644                 drm_mm_put_block(bo->vm_node);
 645                 bo->vm_node = NULL;
 646         }
 647         write_unlock(&bdev->vm_lock);
 648         ttm_bo_cleanup_refs(bo, false);
 649         kref_put(&bo->list_kref, ttm_bo_release_list);
 650         write_lock(&bdev->vm_lock);
 651 }
 652
 653 void ttm_bo_unref(struct ttm_buffer_object **p_bo)
 654 {
 655         struct ttm_buffer_object *bo = *p_bo;
 656         struct ttm_bo_device *bdev = bo->bdev;
 657
 658         *p_bo = NULL;
 659         write_lock(&bdev->vm_lock);
 660         kref_put(&bo->kref, ttm_bo_release);
 661         write_unlock(&bdev->vm_lock);
 662 }
 663 EXPORT_SYMBOL(ttm_bo_unref);
 664
 665 int ttm_bo_lock_delayed_workqueue(struct ttm_bo_device *bdev)
 666 {
 667         return cancel_delayed_work_sync(&bdev->wq);
 668 }
 669 EXPORT_SYMBOL(ttm_bo_lock_delayed_workqueue);
 670
 671 void ttm_bo_unlock_delayed_workqueue(struct ttm_bo_device *bdev, int resched)
 672 {
 673         if (resched)
 674                 schedule_delayed_work(&bdev->wq,
 675                                       ((HZ / 100) < 1) ? 1 : HZ / 100);
 676 }
 677 EXPORT_SYMBOL(ttm_bo_unlock_delayed_workqueue);
 678
 679 static int ttm_bo_evict(struct ttm_buffer_object *bo, bool interruptible,
 680                         bool no_wait_reserve, bool no_wait_gpu)
 681 {
 682         struct ttm_bo_device *bdev = bo->bdev;
 683         struct ttm_bo_global *glob = bo->glob;
 684         struct ttm_mem_reg evict_mem;
 685         struct ttm_placement placement;
 686         int ret = 0;
 687
 688         spin_lock(&bo->lock);
 689         ret = ttm_bo_wait(bo, false, interruptible, no_wait_gpu);
 690         spin_unlock(&bo->lock);
 691
 692         if (unlikely(ret != 0)) {
 693                 if (ret != -ERESTARTSYS) {
 694                         printk(KERN_ERR TTM_PFX
 695                                "Failed to expire sync object before "
 696                                "buffer eviction.\n");
 697                 }
 698                 goto out;
 699         }
 700
 701         BUG_ON(!atomic_read(&bo->reserved));
 702
 703         evict_mem = bo->mem;
 704         evict_mem.mm_node = NULL;
 705         evict_mem.bus.io_reserved = false;
 706
 707         placement.fpfn = 0;
 708         placement.lpfn = 0;
 709         placement.num_placement = 0;
 710         placement.num_busy_placement = 0;
 711         bdev->driver->evict_flags(bo, &placement);
 712         ret = ttm_bo_mem_space(bo, &placement, &evict_mem, interruptible,
 713                                 no_wait_reserve, no_wait_gpu);
 714         if (ret) {
 715                 if (ret != -ERESTARTSYS) {
 716                         printk(KERN_ERR TTM_PFX
 717                                "Failed to find memory space for "
 718                                "buffer 0x%p eviction.\n", bo);
 719                         ttm_bo_mem_space_debug(bo, &placement);
 720                 }
 721                 goto out;
 722         }
 723
 724         ret = ttm_bo_handle_move_mem(bo, &evict_mem, true, interruptible,
 725                                      no_wait_reserve, no_wait_gpu);
 726         if (ret) {
 727                 if (ret != -ERESTARTSYS)
 728                         printk(KERN_ERR TTM_PFX "Buffer eviction failed\n");
 729                 spin_lock(&glob->lru_lock);
 730                 if (evict_mem.mm_node) {
 731                         drm_mm_put_block(evict_mem.mm_node);
 732                         evict_mem.mm_node = NULL;
 733                 }
 734                 spin_unlock(&glob->lru_lock);
 735                 goto out;
 736         }
 737         bo->evicted = true;
 738 out:
 739         return ret;
 740 }
 741
 742 static int ttm_mem_evict_first(struct ttm_bo_device *bdev,
 743                                 uint32_t mem_type,
 744                                 bool interruptible, bool no_wait_reserve,
 745                                 bool no_wait_gpu)
 746 {
 747         struct ttm_bo_global *glob = bdev->glob;
 748         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
 749         struct ttm_buffer_object *bo;
 750         int ret, put_count = 0;
 751
 752 retry:
 753         spin_lock(&glob->lru_lock);
 754         if (list_empty(&man->lru)) {
 755                 spin_unlock(&glob->lru_lock);
 756                 return -EBUSY;
 757         }
 758
 759         bo = list_first_entry(&man->lru, struct ttm_buffer_object, lru);
 760         kref_get(&bo->list_kref);
 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 static int ttm_bo_man_get_node(struct ttm_buffer_object *bo,
 796                                 struct ttm_mem_type_manager *man,
 797                                 struct ttm_placement *placement,
 798                                 struct ttm_mem_reg *mem,
 799                                 struct drm_mm_node **node)
 800 {
 801         struct ttm_bo_global *glob = bo->glob;
 802         unsigned long lpfn;
 803         int ret;
 804
 805         lpfn = placement->lpfn;
 806         if (!lpfn)
 807                 lpfn = man->size;
 808         *node = NULL;
 809         do {
 810                 ret = drm_mm_pre_get(&man->manager);
 811                 if (unlikely(ret))
 812                         return ret;
 813
 814                 spin_lock(&glob->lru_lock);
 815                 *node = drm_mm_search_free_in_range(&man->manager,
 816                                         mem->num_pages, mem->page_alignment,
 817                                         placement->fpfn, lpfn, 1);
 818                 if (unlikely(*node == NULL)) {
 819                         spin_unlock(&glob->lru_lock);
 820                         return 0;
 821                 }
 822                 *node = drm_mm_get_block_atomic_range(*node, mem->num_pages,
 823                                                         mem->page_alignment,
 824                                                         placement->fpfn,
 825                                                         lpfn);
 826                 spin_unlock(&glob->lru_lock);
 827         } while (*node == NULL);
 828         return 0;
 829 }
 830
 831 /**
 832  * Repeatedly evict memory from the LRU for @mem_type until we create enough
 833  * space, or we've evicted everything and there isn't enough space.
 834  */
 835 static int ttm_bo_mem_force_space(struct ttm_buffer_object *bo,
 836                                         uint32_t mem_type,
 837                                         struct ttm_placement *placement,
 838                                         struct ttm_mem_reg *mem,
 839                                         bool interruptible,
 840                                         bool no_wait_reserve,
 841                                         bool no_wait_gpu)
 842 {
 843         struct ttm_bo_device *bdev = bo->bdev;
 844         struct ttm_bo_global *glob = bdev->glob;
 845         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
 846         struct drm_mm_node *node;
 847         int ret;
 848
 849         do {
 850                 ret = ttm_bo_man_get_node(bo, man, placement, mem, &node);
 851                 if (unlikely(ret != 0))
 852                         return ret;
 853                 if (node)
 854                         break;
 855                 spin_lock(&glob->lru_lock);
 856                 if (list_empty(&man->lru)) {
 857                         spin_unlock(&glob->lru_lock);
 858                         break;
 859                 }
 860                 spin_unlock(&glob->lru_lock);
 861                 ret = ttm_mem_evict_first(bdev, mem_type, interruptible,
 862                                                 no_wait_reserve, no_wait_gpu);
 863                 if (unlikely(ret != 0))
 864                         return ret;
 865         } while (1);
 866         if (node == NULL)
 867                 return -ENOMEM;
 868         mem->mm_node = node;
 869         mem->mem_type = mem_type;
 870         return 0;
 871 }
 872
 873 static uint32_t ttm_bo_select_caching(struct ttm_mem_type_manager *man,
 874                                       uint32_t cur_placement,
 875                                       uint32_t proposed_placement)
 876 {
 877         uint32_t caching = proposed_placement & TTM_PL_MASK_CACHING;
 878         uint32_t result = proposed_placement & ~TTM_PL_MASK_CACHING;
 879
 880         /**
 881          * Keep current caching if possible.
 882          */
 883
 884         if ((cur_placement & caching) != 0)
 885                 result |= (cur_placement & caching);
 886         else if ((man->default_caching & caching) != 0)
 887                 result |= man->default_caching;
 888         else if ((TTM_PL_FLAG_CACHED & caching) != 0)
 889                 result |= TTM_PL_FLAG_CACHED;
 890         else if ((TTM_PL_FLAG_WC & caching) != 0)
 891                 result |= TTM_PL_FLAG_WC;
 892         else if ((TTM_PL_FLAG_UNCACHED & caching) != 0)
 893                 result |= TTM_PL_FLAG_UNCACHED;
 894
 895         return result;
 896 }
 897
 898 static bool ttm_bo_mt_compatible(struct ttm_mem_type_manager *man,
 899                                  bool disallow_fixed,
 900                                  uint32_t mem_type,
 901                                  uint32_t proposed_placement,
 902                                  uint32_t *masked_placement)
 903 {
 904         uint32_t cur_flags = ttm_bo_type_flags(mem_type);
 905
 906         if ((man->flags & TTM_MEMTYPE_FLAG_FIXED) && disallow_fixed)
 907                 return false;
 908
 909         if ((cur_flags & proposed_placement & TTM_PL_MASK_MEM) == 0)
 910                 return false;
 911
 912         if ((proposed_placement & man->available_caching) == 0)
 913                 return false;
 914
 915         cur_flags |= (proposed_placement & man->available_caching);
 916
 917         *masked_placement = cur_flags;
 918         return true;
 919 }
 920
 921 /**
 922  * Creates space for memory region @mem according to its type.
 923  *
 924  * This function first searches for free space in compatible memory types in
 925  * the priority order defined by the driver.  If free space isn't found, then
 926  * ttm_bo_mem_force_space is attempted in priority order to evict and find
 927  * space.
 928  */
 929 int ttm_bo_mem_space(struct ttm_buffer_object *bo,
 930                         struct ttm_placement *placement,
 931                         struct ttm_mem_reg *mem,
 932                         bool interruptible, bool no_wait_reserve,
 933                         bool no_wait_gpu)
 934 {
 935         struct ttm_bo_device *bdev = bo->bdev;
 936         struct ttm_mem_type_manager *man;
 937         uint32_t mem_type = TTM_PL_SYSTEM;
 938         uint32_t cur_flags = 0;
 939         bool type_found = false;
 940         bool type_ok = false;
 941         bool has_erestartsys = false;
 942         struct drm_mm_node *node = NULL;
 943         int i, ret;
 944
 945         mem->mm_node = NULL;
 946         for (i = 0; i < placement->num_placement; ++i) {
 947                 ret = ttm_mem_type_from_flags(placement->placement[i],
 948                                                 &mem_type);
 949                 if (ret)
 950                         return ret;
 951                 man = &bdev->man[mem_type];
 952
 953                 type_ok = ttm_bo_mt_compatible(man,
 954                                                 bo->type == ttm_bo_type_user,
 955                                                 mem_type,
 956                                                 placement->placement[i],
 957                                                 &cur_flags);
 958
 959                 if (!type_ok)
 960                         continue;
 961
 962                 cur_flags = ttm_bo_select_caching(man, bo->mem.placement,
 963                                                   cur_flags);
 964                 /*
 965                  * Use the access and other non-mapping-related flag bits from
 966                  * the memory placement flags to the current flags
 967                  */
 968                 ttm_flag_masked(&cur_flags, placement->placement[i],
 969                                 ~TTM_PL_MASK_MEMTYPE);
 970
 971                 if (mem_type == TTM_PL_SYSTEM)
 972                         break;
 973
 974                 if (man->has_type && man->use_type) {
 975                         type_found = true;
 976                         ret = ttm_bo_man_get_node(bo, man, placement, mem,
 977                                                         &node);
 978                         if (unlikely(ret))
 979                                 return ret;
 980                 }
 981                 if (node)
 982                         break;
 983         }
 984
 985         if ((type_ok && (mem_type == TTM_PL_SYSTEM)) || node) {
 986                 mem->mm_node = node;
 987                 mem->mem_type = mem_type;
 988                 mem->placement = cur_flags;
 989                 return 0;
 990         }
 991
 992         if (!type_found)
 993                 return -EINVAL;
 994
 995         for (i = 0; i < placement->num_busy_placement; ++i) {
 996                 ret = ttm_mem_type_from_flags(placement->busy_placement[i],
 997                                                 &mem_type);
 998                 if (ret)
 999                         return ret;
1000                 man = &bdev->man[mem_type];
1001                 if (!man->has_type)
1002                         continue;
1003                 if (!ttm_bo_mt_compatible(man,
1004                                                 bo->type == ttm_bo_type_user,
1005                                                 mem_type,
1006                                                 placement->busy_placement[i],
1007                                                 &cur_flags))
1008                         continue;
1009
1010                 cur_flags = ttm_bo_select_caching(man, bo->mem.placement,
1011                                                   cur_flags);
1012                 /*
1013                  * Use the access and other non-mapping-related flag bits from
1014                  * the memory placement flags to the current flags
1015                  */
1016                 ttm_flag_masked(&cur_flags, placement->busy_placement[i],
1017                                 ~TTM_PL_MASK_MEMTYPE);
1018
1019
1020                 if (mem_type == TTM_PL_SYSTEM) {
1021                         mem->mem_type = mem_type;
1022                         mem->placement = cur_flags;
1023                         mem->mm_node = NULL;
1024                         return 0;
1025                 }
1026
1027                 ret = ttm_bo_mem_force_space(bo, mem_type, placement, mem,
1028                                                 interruptible, no_wait_reserve, no_wait_gpu);
1029                 if (ret == 0 && mem->mm_node) {
1030                         mem->placement = cur_flags;
1031                         return 0;
1032                 }
1033                 if (ret == -ERESTARTSYS)
1034                         has_erestartsys = true;
1035         }
1036         ret = (has_erestartsys) ? -ERESTARTSYS : -ENOMEM;
1037         return ret;
1038 }
1039 EXPORT_SYMBOL(ttm_bo_mem_space);
1040
1041 int ttm_bo_wait_cpu(struct ttm_buffer_object *bo, bool no_wait)
1042 {
1043         if ((atomic_read(&bo->cpu_writers) > 0) && no_wait)
1044                 return -EBUSY;
1045
1046         return wait_event_interruptible(bo->event_queue,
1047                                         atomic_read(&bo->cpu_writers) == 0);
1048 }
1049 EXPORT_SYMBOL(ttm_bo_wait_cpu);
1050
1051 int ttm_bo_move_buffer(struct ttm_buffer_object *bo,
1052                         struct ttm_placement *placement,
1053                         bool interruptible, bool no_wait_reserve,
1054                         bool no_wait_gpu)
1055 {
1056         struct ttm_bo_global *glob = bo->glob;
1057         int ret = 0;
1058         struct ttm_mem_reg mem;
1059
1060         BUG_ON(!atomic_read(&bo->reserved));
1061
1062         /*
1063          * FIXME: It's possible to pipeline buffer moves.
1064          * Have the driver move function wait for idle when necessary,
1065          * instead of doing it here.
1066          */
1067         spin_lock(&bo->lock);
1068         ret = ttm_bo_wait(bo, false, interruptible, no_wait_gpu);
1069         spin_unlock(&bo->lock);
1070         if (ret)
1071                 return ret;
1072         mem.num_pages = bo->num_pages;
1073         mem.size = mem.num_pages << PAGE_SHIFT;
1074         mem.page_alignment = bo->mem.page_alignment;
1075         mem.bus.io_reserved = false;
1076         /*
1077          * Determine where to move the buffer.
1078          */
1079         ret = ttm_bo_mem_space(bo, placement, &mem, interruptible, no_wait_reserve, no_wait_gpu);
1080         if (ret)
1081                 goto out_unlock;
1082         ret = ttm_bo_handle_move_mem(bo, &mem, false, interruptible, no_wait_reserve, no_wait_gpu);
1083 out_unlock:
1084         if (ret && mem.mm_node) {
1085                 spin_lock(&glob->lru_lock);
1086                 drm_mm_put_block(mem.mm_node);
1087                 spin_unlock(&glob->lru_lock);
1088         }
1089         return ret;
1090 }
1091
1092 static int ttm_bo_mem_compat(struct ttm_placement *placement,
1093                              struct ttm_mem_reg *mem)
1094 {
1095         int i;
1096         struct drm_mm_node *node = mem->mm_node;
1097
1098         if (node && placement->lpfn != 0 &&
1099             (node->start < placement->fpfn ||
1100              node->start + node->size > placement->lpfn))
1101                 return -1;
1102
1103         for (i = 0; i < placement->num_placement; i++) {
1104                 if ((placement->placement[i] & mem->placement &
1105                         TTM_PL_MASK_CACHING) &&
1106                         (placement->placement[i] & mem->placement &
1107                         TTM_PL_MASK_MEM))
1108                         return i;
1109         }
1110         return -1;
1111 }
1112
1113 int ttm_bo_validate(struct ttm_buffer_object *bo,
1114                         struct ttm_placement *placement,
1115                         bool interruptible, bool no_wait_reserve,
1116                         bool no_wait_gpu)
1117 {
1118         int ret;
1119
1120         BUG_ON(!atomic_read(&bo->reserved));
1121         /* Check that range is valid */
1122         if (placement->lpfn || placement->fpfn)
1123                 if (placement->fpfn > placement->lpfn ||
1124                         (placement->lpfn - placement->fpfn) < bo->num_pages)
1125                         return -EINVAL;
1126         /*
1127          * Check whether we need to move buffer.
1128          */
1129         ret = ttm_bo_mem_compat(placement, &bo->mem);
1130         if (ret < 0) {
1131                 ret = ttm_bo_move_buffer(bo, placement, interruptible, no_wait_reserve, no_wait_gpu);
1132                 if (ret)
1133                         return ret;
1134         } else {
1135                 /*
1136                  * Use the access and other non-mapping-related flag bits from
1137                  * the compatible memory placement flags to the active flags
1138                  */
1139                 ttm_flag_masked(&bo->mem.placement, placement->placement[ret],
1140                                 ~TTM_PL_MASK_MEMTYPE);
1141         }
1142         /*
1143          * We might need to add a TTM.
1144          */
1145         if (bo->mem.mem_type == TTM_PL_SYSTEM && bo->ttm == NULL) {
1146                 ret = ttm_bo_add_ttm(bo, true);
1147                 if (ret)
1148                         return ret;
1149         }
1150         return 0;
1151 }
1152 EXPORT_SYMBOL(ttm_bo_validate);
1153
1154 int ttm_bo_check_placement(struct ttm_buffer_object *bo,
1155                                 struct ttm_placement *placement)
1156 {
1157         int i;
1158
1159         if (placement->fpfn || placement->lpfn) {
1160                 if (bo->mem.num_pages > (placement->lpfn - placement->fpfn)) {
1161                         printk(KERN_ERR TTM_PFX "Page number range to small "
1162                                 "Need %lu pages, range is [%u, %u]\n",
1163                                 bo->mem.num_pages, placement->fpfn,
1164                                 placement->lpfn);
1165                         return -EINVAL;
1166                 }
1167         }
1168         for (i = 0; i < placement->num_placement; i++) {
1169                 if (!capable(CAP_SYS_ADMIN)) {
1170                         if (placement->placement[i] & TTM_PL_FLAG_NO_EVICT) {
1171                                 printk(KERN_ERR TTM_PFX "Need to be root to "
1172                                         "modify NO_EVICT status.\n");
1173                                 return -EINVAL;
1174                         }
1175                 }
1176         }
1177         for (i = 0; i < placement->num_busy_placement; i++) {
1178                 if (!capable(CAP_SYS_ADMIN)) {
1179                         if (placement->busy_placement[i] & TTM_PL_FLAG_NO_EVICT) {
1180                                 printk(KERN_ERR TTM_PFX "Need to be root to "
1181                                         "modify NO_EVICT status.\n");
1182                                 return -EINVAL;
1183                         }
1184                 }
1185         }
1186         return 0;
1187 }
1188
1189 int ttm_bo_init(struct ttm_bo_device *bdev,
1190                 struct ttm_buffer_object *bo,
1191                 unsigned long size,
1192                 enum ttm_bo_type type,
1193                 struct ttm_placement *placement,
1194                 uint32_t page_alignment,
1195                 unsigned long buffer_start,
1196                 bool interruptible,
1197                 struct file *persistant_swap_storage,
1198                 size_t acc_size,
1199                 void (*destroy) (struct ttm_buffer_object *))
1200 {
1201         int ret = 0;
1202         unsigned long num_pages;
1203
1204         size += buffer_start & ~PAGE_MASK;
1205         num_pages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
1206         if (num_pages == 0) {
1207                 printk(KERN_ERR TTM_PFX "Illegal buffer object size.\n");
1208                 return -EINVAL;
1209         }
1210         bo->destroy = destroy;
1211
1212         spin_lock_init(&bo->lock);
1213         kref_init(&bo->kref);
1214         kref_init(&bo->list_kref);
1215         atomic_set(&bo->cpu_writers, 0);
1216         atomic_set(&bo->reserved, 1);
1217         init_waitqueue_head(&bo->event_queue);
1218         INIT_LIST_HEAD(&bo->lru);
1219         INIT_LIST_HEAD(&bo->ddestroy);
1220         INIT_LIST_HEAD(&bo->swap);
1221         bo->bdev = bdev;
1222         bo->glob = bdev->glob;
1223         bo->type = type;
1224         bo->num_pages = num_pages;
1225         bo->mem.size = num_pages << PAGE_SHIFT;
1226         bo->mem.mem_type = TTM_PL_SYSTEM;
1227         bo->mem.num_pages = bo->num_pages;
1228         bo->mem.mm_node = NULL;
1229         bo->mem.page_alignment = page_alignment;
1230         bo->mem.bus.io_reserved = false;
1231         bo->buffer_start = buffer_start & PAGE_MASK;
1232         bo->priv_flags = 0;
1233         bo->mem.placement = (TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED);
1234         bo->seq_valid = false;
1235         bo->persistant_swap_storage = persistant_swap_storage;
1236         bo->acc_size = acc_size;
1237         atomic_inc(&bo->glob->bo_count);
1238
1239         ret = ttm_bo_check_placement(bo, placement);
1240         if (unlikely(ret != 0))
1241                 goto out_err;
1242
1243         /*
1244          * For ttm_bo_type_device buffers, allocate
1245          * address space from the device.
1246          */
1247         if (bo->type == ttm_bo_type_device) {
1248                 ret = ttm_bo_setup_vm(bo);
1249                 if (ret)
1250                         goto out_err;
1251         }
1252
1253         ret = ttm_bo_validate(bo, placement, interruptible, false, false);
1254         if (ret)
1255                 goto out_err;
1256
1257         ttm_bo_unreserve(bo);
1258         return 0;
1259
1260 out_err:
1261         ttm_bo_unreserve(bo);
1262         ttm_bo_unref(&bo);
1263
1264         return ret;
1265 }
1266 EXPORT_SYMBOL(ttm_bo_init);
1267
1268 static inline size_t ttm_bo_size(struct ttm_bo_global *glob,
1269                                  unsigned long num_pages)
1270 {
1271         size_t page_array_size = (num_pages * sizeof(void *) + PAGE_SIZE - 1) &
1272             PAGE_MASK;
1273
1274         return glob->ttm_bo_size + 2 * page_array_size;
1275 }
1276
1277 int ttm_bo_create(struct ttm_bo_device *bdev,
1278                         unsigned long size,
1279                         enum ttm_bo_type type,
1280                         struct ttm_placement *placement,
1281                         uint32_t page_alignment,
1282                         unsigned long buffer_start,
1283                         bool interruptible,
1284                         struct file *persistant_swap_storage,
1285                         struct ttm_buffer_object **p_bo)
1286 {
1287         struct ttm_buffer_object *bo;
1288         struct ttm_mem_global *mem_glob = bdev->glob->mem_glob;
1289         int ret;
1290
1291         size_t acc_size =
1292             ttm_bo_size(bdev->glob, (size + PAGE_SIZE - 1) >> PAGE_SHIFT);
1293         ret = ttm_mem_global_alloc(mem_glob, acc_size, false, false);
1294         if (unlikely(ret != 0))
1295                 return ret;
1296
1297         bo = kzalloc(sizeof(*bo), GFP_KERNEL);
1298
1299         if (unlikely(bo == NULL)) {
1300                 ttm_mem_global_free(mem_glob, acc_size);
1301                 return -ENOMEM;
1302         }
1303
1304         ret = ttm_bo_init(bdev, bo, size, type, placement, page_alignment,
1305                                 buffer_start, interruptible,
1306                                 persistant_swap_storage, acc_size, NULL);
1307         if (likely(ret == 0))
1308                 *p_bo = bo;
1309
1310         return ret;
1311 }
1312
1313 static int ttm_bo_force_list_clean(struct ttm_bo_device *bdev,
1314                                         unsigned mem_type, bool allow_errors)
1315 {
1316         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
1317         struct ttm_bo_global *glob = bdev->glob;
1318         int ret;
1319
1320         /*
1321          * Can't use standard list traversal since we're unlocking.
1322          */
1323
1324         spin_lock(&glob->lru_lock);
1325         while (!list_empty(&man->lru)) {
1326                 spin_unlock(&glob->lru_lock);
1327                 ret = ttm_mem_evict_first(bdev, mem_type, false, false, false);
1328                 if (ret) {
1329                         if (allow_errors) {
1330                                 return ret;
1331                         } else {
1332                                 printk(KERN_ERR TTM_PFX
1333                                         "Cleanup eviction failed\n");
1334                         }
1335                 }
1336                 spin_lock(&glob->lru_lock);
1337         }
1338         spin_unlock(&glob->lru_lock);
1339         return 0;
1340 }
1341
1342 int ttm_bo_clean_mm(struct ttm_bo_device *bdev, unsigned mem_type)
1343 {
1344         struct ttm_bo_global *glob = bdev->glob;
1345         struct ttm_mem_type_manager *man;
1346         int ret = -EINVAL;
1347
1348         if (mem_type >= TTM_NUM_MEM_TYPES) {
1349                 printk(KERN_ERR TTM_PFX "Illegal memory type %d\n", mem_type);
1350                 return ret;
1351         }
1352         man = &bdev->man[mem_type];
1353
1354         if (!man->has_type) {
1355                 printk(KERN_ERR TTM_PFX "Trying to take down uninitialized "
1356                        "memory manager type %u\n", mem_type);
1357                 return ret;
1358         }
1359
1360         man->use_type = false;
1361         man->has_type = false;
1362
1363         ret = 0;
1364         if (mem_type > 0) {
1365                 ttm_bo_force_list_clean(bdev, mem_type, false);
1366
1367                 spin_lock(&glob->lru_lock);
1368                 if (drm_mm_clean(&man->manager))
1369                         drm_mm_takedown(&man->manager);
1370                 else
1371                         ret = -EBUSY;
1372
1373                 spin_unlock(&glob->lru_lock);
1374         }
1375
1376         return ret;
1377 }
1378 EXPORT_SYMBOL(ttm_bo_clean_mm);
1379
1380 int ttm_bo_evict_mm(struct ttm_bo_device *bdev, unsigned mem_type)
1381 {
1382         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
1383
1384         if (mem_type == 0 || mem_type >= TTM_NUM_MEM_TYPES) {
1385                 printk(KERN_ERR TTM_PFX
1386                        "Illegal memory manager memory type %u.\n",
1387                        mem_type);
1388                 return -EINVAL;
1389         }
1390
1391         if (!man->has_type) {
1392                 printk(KERN_ERR TTM_PFX
1393                        "Memory type %u has not been initialized.\n",
1394                        mem_type);
1395                 return 0;
1396         }
1397
1398         return ttm_bo_force_list_clean(bdev, mem_type, true);
1399 }
1400 EXPORT_SYMBOL(ttm_bo_evict_mm);
1401
1402 int ttm_bo_init_mm(struct ttm_bo_device *bdev, unsigned type,
1403                         unsigned long p_size)
1404 {
1405         int ret = -EINVAL;
1406         struct ttm_mem_type_manager *man;
1407
1408         if (type >= TTM_NUM_MEM_TYPES) {
1409                 printk(KERN_ERR TTM_PFX "Illegal memory type %d\n", type);
1410                 return ret;
1411         }
1412
1413         man = &bdev->man[type];
1414         if (man->has_type) {
1415                 printk(KERN_ERR TTM_PFX
1416                        "Memory manager already initialized for type %d\n",
1417                        type);
1418                 return ret;
1419         }
1420
1421         ret = bdev->driver->init_mem_type(bdev, type, man);
1422         if (ret)
1423                 return ret;
1424
1425         ret = 0;
1426         if (type != TTM_PL_SYSTEM) {
1427                 if (!p_size) {
1428                         printk(KERN_ERR TTM_PFX
1429                                "Zero size memory manager type %d\n",
1430                                type);
1431                         return ret;
1432                 }
1433                 ret = drm_mm_init(&man->manager, 0, p_size);
1434                 if (ret)
1435                         return ret;
1436         }
1437         man->has_type = true;
1438         man->use_type = true;
1439         man->size = p_size;
1440
1441         INIT_LIST_HEAD(&man->lru);
1442
1443         return 0;
1444 }
1445 EXPORT_SYMBOL(ttm_bo_init_mm);
1446
1447 static void ttm_bo_global_kobj_release(struct kobject *kobj)
1448 {
1449         struct ttm_bo_global *glob =
1450                 container_of(kobj, struct ttm_bo_global, kobj);
1451
1452         ttm_mem_unregister_shrink(glob->mem_glob, &glob->shrink);
1453         __free_page(glob->dummy_read_page);
1454         kfree(glob);
1455 }
1456
1457 void ttm_bo_global_release(struct drm_global_reference *ref)
1458 {
1459         struct ttm_bo_global *glob = ref->object;
1460
1461         kobject_del(&glob->kobj);
1462         kobject_put(&glob->kobj);
1463 }
1464 EXPORT_SYMBOL(ttm_bo_global_release);
1465
1466 int ttm_bo_global_init(struct drm_global_reference *ref)
1467 {
1468         struct ttm_bo_global_ref *bo_ref =
1469                 container_of(ref, struct ttm_bo_global_ref, ref);
1470         struct ttm_bo_global *glob = ref->object;
1471         int ret;
1472
1473         mutex_init(&glob->device_list_mutex);
1474         spin_lock_init(&glob->lru_lock);
1475         glob->mem_glob = bo_ref->mem_glob;
1476         glob->dummy_read_page = alloc_page(__GFP_ZERO | GFP_DMA32);
1477
1478         if (unlikely(glob->dummy_read_page == NULL)) {
1479                 ret = -ENOMEM;
1480                 goto out_no_drp;
1481         }
1482
1483         INIT_LIST_HEAD(&glob->swap_lru);
1484         INIT_LIST_HEAD(&glob->device_list);
1485
1486         ttm_mem_init_shrink(&glob->shrink, ttm_bo_swapout);
1487         ret = ttm_mem_register_shrink(glob->mem_glob, &glob->shrink);
1488         if (unlikely(ret != 0)) {
1489                 printk(KERN_ERR TTM_PFX
1490                        "Could not register buffer object swapout.\n");
1491                 goto out_no_shrink;
1492         }
1493
1494         glob->ttm_bo_extra_size =
1495                 ttm_round_pot(sizeof(struct ttm_tt)) +
1496                 ttm_round_pot(sizeof(struct ttm_backend));
1497
1498         glob->ttm_bo_size = glob->ttm_bo_extra_size +
1499                 ttm_round_pot(sizeof(struct ttm_buffer_object));
1500
1501         atomic_set(&glob->bo_count, 0);
1502
1503         ret = kobject_init_and_add(
1504                 &glob->kobj, &ttm_bo_glob_kobj_type, ttm_get_kobj(), "buffer_objects");
1505         if (unlikely(ret != 0))
1506                 kobject_put(&glob->kobj);
1507         return ret;
1508 out_no_shrink:
1509         __free_page(glob->dummy_read_page);
1510 out_no_drp:
1511         kfree(glob);
1512         return ret;
1513 }
1514 EXPORT_SYMBOL(ttm_bo_global_init);
1515
1516
1517 int ttm_bo_device_release(struct ttm_bo_device *bdev)
1518 {
1519         int ret = 0;
1520         unsigned i = TTM_NUM_MEM_TYPES;
1521         struct ttm_mem_type_manager *man;
1522         struct ttm_bo_global *glob = bdev->glob;
1523
1524         while (i--) {
1525                 man = &bdev->man[i];
1526                 if (man->has_type) {
1527                         man->use_type = false;
1528                         if ((i != TTM_PL_SYSTEM) && ttm_bo_clean_mm(bdev, i)) {
1529                                 ret = -EBUSY;
1530                                 printk(KERN_ERR TTM_PFX
1531                                        "DRM memory manager type %d "
1532                                        "is not clean.\n", i);
1533                         }
1534                         man->has_type = false;
1535                 }
1536         }
1537
1538         mutex_lock(&glob->device_list_mutex);
1539         list_del(&bdev->device_list);
1540         mutex_unlock(&glob->device_list_mutex);
1541
1542         if (!cancel_delayed_work(&bdev->wq))
1543                 flush_scheduled_work();
1544
1545         while (ttm_bo_delayed_delete(bdev, true))
1546                 ;
1547
1548         spin_lock(&glob->lru_lock);
1549         if (list_empty(&bdev->ddestroy))
1550                 TTM_DEBUG("Delayed destroy list was clean\n");
1551
1552         if (list_empty(&bdev->man[0].lru))
1553                 TTM_DEBUG("Swap list was clean\n");
1554         spin_unlock(&glob->lru_lock);
1555
1556         BUG_ON(!drm_mm_clean(&bdev->addr_space_mm));
1557         write_lock(&bdev->vm_lock);
1558         drm_mm_takedown(&bdev->addr_space_mm);
1559         write_unlock(&bdev->vm_lock);
1560
1561         return ret;
1562 }
1563 EXPORT_SYMBOL(ttm_bo_device_release);
1564
1565 int ttm_bo_device_init(struct ttm_bo_device *bdev,
1566                        struct ttm_bo_global *glob,
1567                        struct ttm_bo_driver *driver,
1568                        uint64_t file_page_offset,
1569                        bool need_dma32)
1570 {
1571         int ret = -EINVAL;
1572
1573         rwlock_init(&bdev->vm_lock);
1574         bdev->driver = driver;
1575
1576         memset(bdev->man, 0, sizeof(bdev->man));
1577
1578         /*
1579          * Initialize the system memory buffer type.
1580          * Other types need to be driver / IOCTL initialized.
1581          */
1582         ret = ttm_bo_init_mm(bdev, TTM_PL_SYSTEM, 0);
1583         if (unlikely(ret != 0))
1584                 goto out_no_sys;
1585
1586         bdev->addr_space_rb = RB_ROOT;
1587         ret = drm_mm_init(&bdev->addr_space_mm, file_page_offset, 0x10000000);
1588         if (unlikely(ret != 0))
1589                 goto out_no_addr_mm;
1590
1591         INIT_DELAYED_WORK(&bdev->wq, ttm_bo_delayed_workqueue);
1592         bdev->nice_mode = true;
1593         INIT_LIST_HEAD(&bdev->ddestroy);
1594         bdev->dev_mapping = NULL;
1595         bdev->glob = glob;
1596         bdev->need_dma32 = need_dma32;
1597
1598         mutex_lock(&glob->device_list_mutex);
1599         list_add_tail(&bdev->device_list, &glob->device_list);
1600         mutex_unlock(&glob->device_list_mutex);
1601
1602         return 0;
1603 out_no_addr_mm:
1604         ttm_bo_clean_mm(bdev, 0);
1605 out_no_sys:
1606         return ret;
1607 }
1608 EXPORT_SYMBOL(ttm_bo_device_init);
1609
1610 /*
1611  * buffer object vm functions.
1612  */
1613
1614 bool ttm_mem_reg_is_pci(struct ttm_bo_device *bdev, struct ttm_mem_reg *mem)
1615 {
1616         struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
1617
1618         if (!(man->flags & TTM_MEMTYPE_FLAG_FIXED)) {
1619                 if (mem->mem_type == TTM_PL_SYSTEM)
1620                         return false;
1621
1622                 if (man->flags & TTM_MEMTYPE_FLAG_CMA)
1623                         return false;
1624
1625                 if (mem->placement & TTM_PL_FLAG_CACHED)
1626                         return false;
1627         }
1628         return true;
1629 }
1630
1631 void ttm_bo_unmap_virtual(struct ttm_buffer_object *bo)
1632 {
1633         struct ttm_bo_device *bdev = bo->bdev;
1634         loff_t offset = (loff_t) bo->addr_space_offset;
1635         loff_t holelen = ((loff_t) bo->mem.num_pages) << PAGE_SHIFT;
1636
1637         if (!bdev->dev_mapping)
1638                 return;
1639         unmap_mapping_range(bdev->dev_mapping, offset, holelen, 1);
1640         ttm_mem_io_free(bdev, &bo->mem);
1641 }
1642 EXPORT_SYMBOL(ttm_bo_unmap_virtual);
1643
1644 static void ttm_bo_vm_insert_rb(struct ttm_buffer_object *bo)
1645 {
1646         struct ttm_bo_device *bdev = bo->bdev;
1647         struct rb_node **cur = &bdev->addr_space_rb.rb_node;
1648         struct rb_node *parent = NULL;
1649         struct ttm_buffer_object *cur_bo;
1650         unsigned long offset = bo->vm_node->start;
1651         unsigned long cur_offset;
1652
1653         while (*cur) {
1654                 parent = *cur;
1655                 cur_bo = rb_entry(parent, struct ttm_buffer_object, vm_rb);
1656                 cur_offset = cur_bo->vm_node->start;
1657                 if (offset < cur_offset)
1658                         cur = &parent->rb_left;
1659                 else if (offset > cur_offset)
1660                         cur = &parent->rb_right;
1661                 else
1662                         BUG();
1663         }
1664
1665         rb_link_node(&bo->vm_rb, parent, cur);
1666         rb_insert_color(&bo->vm_rb, &bdev->addr_space_rb);
1667 }
1668
1669 /**
1670  * ttm_bo_setup_vm:
1671  *
1672  * @bo: the buffer to allocate address space for
1673  *
1674  * Allocate address space in the drm device so that applications
1675  * can mmap the buffer and access the contents. This only
1676  * applies to ttm_bo_type_device objects as others are not
1677  * placed in the drm device address space.
1678  */
1679
1680 static int ttm_bo_setup_vm(struct ttm_buffer_object *bo)
1681 {
1682         struct ttm_bo_device *bdev = bo->bdev;
1683         int ret;
1684
1685 retry_pre_get:
1686         ret = drm_mm_pre_get(&bdev->addr_space_mm);
1687         if (unlikely(ret != 0))
1688                 return ret;
1689
1690         write_lock(&bdev->vm_lock);
1691         bo->vm_node = drm_mm_search_free(&bdev->addr_space_mm,
1692                                          bo->mem.num_pages, 0, 0);
1693
1694         if (unlikely(bo->vm_node == NULL)) {
1695                 ret = -ENOMEM;
1696                 goto out_unlock;
1697         }
1698
1699         bo->vm_node = drm_mm_get_block_atomic(bo->vm_node,
1700                                               bo->mem.num_pages, 0);
1701
1702         if (unlikely(bo->vm_node == NULL)) {
1703                 write_unlock(&bdev->vm_lock);
1704                 goto retry_pre_get;
1705         }
1706
1707         ttm_bo_vm_insert_rb(bo);
1708         write_unlock(&bdev->vm_lock);
1709         bo->addr_space_offset = ((uint64_t) bo->vm_node->start) << PAGE_SHIFT;
1710
1711         return 0;
1712 out_unlock:
1713         write_unlock(&bdev->vm_lock);
1714         return ret;
1715 }
1716
1717 int ttm_bo_wait(struct ttm_buffer_object *bo,
1718                 bool lazy, bool interruptible, bool no_wait)
1719 {
1720         struct ttm_bo_driver *driver = bo->bdev->driver;
1721         void *sync_obj;
1722         void *sync_obj_arg;
1723         int ret = 0;
1724
1725         if (likely(bo->sync_obj == NULL))
1726                 return 0;
1727
1728         while (bo->sync_obj) {
1729
1730                 if (driver->sync_obj_signaled(bo->sync_obj, bo->sync_obj_arg)) {
1731                         void *tmp_obj = bo->sync_obj;
1732                         bo->sync_obj = NULL;
1733                         clear_bit(TTM_BO_PRIV_FLAG_MOVING, &bo->priv_flags);
1734                         spin_unlock(&bo->lock);
1735                         driver->sync_obj_unref(&tmp_obj);
1736                         spin_lock(&bo->lock);
1737                         continue;
1738                 }
1739
1740                 if (no_wait)
1741                         return -EBUSY;
1742
1743                 sync_obj = driver->sync_obj_ref(bo->sync_obj);
1744                 sync_obj_arg = bo->sync_obj_arg;
1745                 spin_unlock(&bo->lock);
1746                 ret = driver->sync_obj_wait(sync_obj, sync_obj_arg,
1747                                             lazy, interruptible);
1748                 if (unlikely(ret != 0)) {
1749                         driver->sync_obj_unref(&sync_obj);
1750                         spin_lock(&bo->lock);
1751                         return ret;
1752                 }
1753                 spin_lock(&bo->lock);
1754                 if (likely(bo->sync_obj == sync_obj &&
1755                            bo->sync_obj_arg == sync_obj_arg)) {
1756                         void *tmp_obj = bo->sync_obj;
1757                         bo->sync_obj = NULL;
1758                         clear_bit(TTM_BO_PRIV_FLAG_MOVING,
1759                                   &bo->priv_flags);
1760                         spin_unlock(&bo->lock);
1761                         driver->sync_obj_unref(&sync_obj);
1762                         driver->sync_obj_unref(&tmp_obj);
1763                         spin_lock(&bo->lock);
1764                 } else {
1765                         spin_unlock(&bo->lock);
1766                         driver->sync_obj_unref(&sync_obj);
1767                         spin_lock(&bo->lock);
1768                 }
1769         }
1770         return 0;
1771 }
1772 EXPORT_SYMBOL(ttm_bo_wait);
1773
1774 int ttm_bo_synccpu_write_grab(struct ttm_buffer_object *bo, bool no_wait)
1775 {
1776         int ret = 0;
1777
1778         /*
1779          * Using ttm_bo_reserve makes sure the lru lists are updated.
1780          */
1781
1782         ret = ttm_bo_reserve(bo, true, no_wait, false, 0);
1783         if (unlikely(ret != 0))
1784                 return ret;
1785         spin_lock(&bo->lock);
1786         ret = ttm_bo_wait(bo, false, true, no_wait);
1787         spin_unlock(&bo->lock);
1788         if (likely(ret == 0))
1789                 atomic_inc(&bo->cpu_writers);
1790         ttm_bo_unreserve(bo);
1791         return ret;
1792 }
1793 EXPORT_SYMBOL(ttm_bo_synccpu_write_grab);
1794
1795 void ttm_bo_synccpu_write_release(struct ttm_buffer_object *bo)
1796 {
1797         if (atomic_dec_and_test(&bo->cpu_writers))
1798                 wake_up_all(&bo->event_queue);
1799 }
1800 EXPORT_SYMBOL(ttm_bo_synccpu_write_release);
1801
1802 /**
1803  * A buffer object shrink method that tries to swap out the first
1804  * buffer object on the bo_global::swap_lru list.
1805  */
1806
1807 static int ttm_bo_swapout(struct ttm_mem_shrink *shrink)
1808 {
1809         struct ttm_bo_global *glob =
1810             container_of(shrink, struct ttm_bo_global, shrink);
1811         struct ttm_buffer_object *bo;
1812         int ret = -EBUSY;
1813         int put_count;
1814         uint32_t swap_placement = (TTM_PL_FLAG_CACHED | TTM_PL_FLAG_SYSTEM);
1815
1816         spin_lock(&glob->lru_lock);
1817         while (ret == -EBUSY) {
1818                 if (unlikely(list_empty(&glob->swap_lru))) {
1819                         spin_unlock(&glob->lru_lock);
1820                         return -EBUSY;
1821                 }
1822
1823                 bo = list_first_entry(&glob->swap_lru,
1824                                       struct ttm_buffer_object, swap);
1825                 kref_get(&bo->list_kref);
1826
1827                 /**
1828                  * Reserve buffer. Since we unlock while sleeping, we need
1829                  * to re-check that nobody removed us from the swap-list while
1830                  * we slept.
1831                  */
1832
1833                 ret = ttm_bo_reserve_locked(bo, false, true, false, 0);
1834                 if (unlikely(ret == -EBUSY)) {
1835                         spin_unlock(&glob->lru_lock);
1836                         ttm_bo_wait_unreserved(bo, false);
1837                         kref_put(&bo->list_kref, ttm_bo_release_list);
1838                         spin_lock(&glob->lru_lock);
1839                 }
1840         }
1841
1842         BUG_ON(ret != 0);
1843         put_count = ttm_bo_del_from_lru(bo);
1844         spin_unlock(&glob->lru_lock);
1845
1846         while (put_count--)
1847                 kref_put(&bo->list_kref, ttm_bo_ref_bug);
1848
1849         /**
1850          * Wait for GPU, then move to system cached.
1851          */
1852
1853         spin_lock(&bo->lock);
1854         ret = ttm_bo_wait(bo, false, false, false);
1855         spin_unlock(&bo->lock);
1856
1857         if (unlikely(ret != 0))
1858                 goto out;
1859
1860         if ((bo->mem.placement & swap_placement) != swap_placement) {
1861                 struct ttm_mem_reg evict_mem;
1862
1863                 evict_mem = bo->mem;
1864                 evict_mem.mm_node = NULL;
1865                 evict_mem.placement = TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED;
1866                 evict_mem.mem_type = TTM_PL_SYSTEM;
1867
1868                 ret = ttm_bo_handle_move_mem(bo, &evict_mem, true,
1869                                              false, false, false);
1870                 if (unlikely(ret != 0))
1871                         goto out;
1872         }
1873
1874         ttm_bo_unmap_virtual(bo);
1875
1876         /**
1877          * Swap out. Buffer will be swapped in again as soon as
1878          * anyone tries to access a ttm page.
1879          */
1880
1881         if (bo->bdev->driver->swap_notify)
1882                 bo->bdev->driver->swap_notify(bo);
1883
1884         ret = ttm_tt_swapout(bo->ttm, bo->persistant_swap_storage);
1885 out:
1886
1887         /**
1888          *
1889          * Unreserve without putting on LRU to avoid swapping out an
1890          * already swapped buffer.
1891          */
1892
1893         atomic_set(&bo->reserved, 0);
1894         wake_up_all(&bo->event_queue);
1895         kref_put(&bo->list_kref, ttm_bo_release_list);
1896         return ret;
1897 }
1898
1899 void ttm_bo_swapout_all(struct ttm_bo_device *bdev)
1900 {
1901         while (ttm_bo_swapout(&bdev->glob->shrink) == 0)
1902                 ;
1903 }
1904 EXPORT_SYMBOL(ttm_bo_swapout_all);