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