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 ssize_t ttm_bo_global_show(struct kobject *kobj,
  63                                   struct attribute *attr,
  64                                   char *buffer)
  65 {
  66         struct ttm_bo_global *glob =
  67                 container_of(kobj, struct ttm_bo_global, kobj);
  68
  69         return snprintf(buffer, PAGE_SIZE, "%lu\n",
  70                         (unsigned long) atomic_read(&glob->bo_count));
  71 }
  72
  73 static struct attribute *ttm_bo_global_attrs[] = {
  74         &ttm_bo_count,
  75         NULL
  76 };
  77
  78 static struct sysfs_ops ttm_bo_global_ops = {
  79         .show = &ttm_bo_global_show
  80 };
  81
  82 static struct kobj_type ttm_bo_glob_kobj_type  = {
  83         .release = &ttm_bo_global_kobj_release,
  84         .sysfs_ops = &ttm_bo_global_ops,
  85         .default_attrs = ttm_bo_global_attrs
  86 };
  87
  88
  89 static inline uint32_t ttm_bo_type_flags(unsigned type)
  90 {
  91         return 1 << (type);
  92 }
  93
  94 static void ttm_bo_release_list(struct kref *list_kref)
  95 {
  96         struct ttm_buffer_object *bo =
  97             container_of(list_kref, struct ttm_buffer_object, list_kref);
  98         struct ttm_bo_device *bdev = bo->bdev;
  99
 100         BUG_ON(atomic_read(&bo->list_kref.refcount));
 101         BUG_ON(atomic_read(&bo->kref.refcount));
 102         BUG_ON(atomic_read(&bo->cpu_writers));
 103         BUG_ON(bo->sync_obj != NULL);
 104         BUG_ON(bo->mem.mm_node != NULL);
 105         BUG_ON(!list_empty(&bo->lru));
 106         BUG_ON(!list_empty(&bo->ddestroy));
 107
 108         if (bo->ttm)
 109                 ttm_tt_destroy(bo->ttm);
 110         atomic_dec(&bo->glob->bo_count);
 111         if (bo->destroy)
 112                 bo->destroy(bo);
 113         else {
 114                 ttm_mem_global_free(bdev->glob->mem_glob, bo->acc_size);
 115                 kfree(bo);
 116         }
 117 }
 118
 119 int ttm_bo_wait_unreserved(struct ttm_buffer_object *bo, bool interruptible)
 120 {
 121
 122         if (interruptible) {
 123                 int ret = 0;
 124
 125                 ret = wait_event_interruptible(bo->event_queue,
 126                                                atomic_read(&bo->reserved) == 0);
 127                 if (unlikely(ret != 0))
 128                         return -ERESTART;
 129         } else {
 130                 wait_event(bo->event_queue, atomic_read(&bo->reserved) == 0);
 131         }
 132         return 0;
 133 }
 134
 135 static void ttm_bo_add_to_lru(struct ttm_buffer_object *bo)
 136 {
 137         struct ttm_bo_device *bdev = bo->bdev;
 138         struct ttm_mem_type_manager *man;
 139
 140         BUG_ON(!atomic_read(&bo->reserved));
 141
 142         if (!(bo->mem.placement & TTM_PL_FLAG_NO_EVICT)) {
 143
 144                 BUG_ON(!list_empty(&bo->lru));
 145
 146                 man = &bdev->man[bo->mem.mem_type];
 147                 list_add_tail(&bo->lru, &man->lru);
 148                 kref_get(&bo->list_kref);
 149
 150                 if (bo->ttm != NULL) {
 151                         list_add_tail(&bo->swap, &bo->glob->swap_lru);
 152                         kref_get(&bo->list_kref);
 153                 }
 154         }
 155 }
 156
 157 /**
 158  * Call with the lru_lock held.
 159  */
 160
 161 static int ttm_bo_del_from_lru(struct ttm_buffer_object *bo)
 162 {
 163         int put_count = 0;
 164
 165         if (!list_empty(&bo->swap)) {
 166                 list_del_init(&bo->swap);
 167                 ++put_count;
 168         }
 169         if (!list_empty(&bo->lru)) {
 170                 list_del_init(&bo->lru);
 171                 ++put_count;
 172         }
 173
 174         /*
 175          * TODO: Add a driver hook to delete from
 176          * driver-specific LRU's here.
 177          */
 178
 179         return put_count;
 180 }
 181
 182 int ttm_bo_reserve_locked(struct ttm_buffer_object *bo,
 183                           bool interruptible,
 184                           bool no_wait, bool use_sequence, uint32_t sequence)
 185 {
 186         struct ttm_bo_global *glob = bo->glob;
 187         int ret;
 188
 189         while (unlikely(atomic_cmpxchg(&bo->reserved, 0, 1) != 0)) {
 190                 if (use_sequence && bo->seq_valid &&
 191                         (sequence - bo->val_seq < (1 << 31))) {
 192                         return -EAGAIN;
 193                 }
 194
 195                 if (no_wait)
 196                         return -EBUSY;
 197
 198                 spin_unlock(&glob->lru_lock);
 199                 ret = ttm_bo_wait_unreserved(bo, interruptible);
 200                 spin_lock(&glob->lru_lock);
 201
 202                 if (unlikely(ret))
 203                         return ret;
 204         }
 205
 206         if (use_sequence) {
 207                 bo->val_seq = sequence;
 208                 bo->seq_valid = true;
 209         } else {
 210                 bo->seq_valid = false;
 211         }
 212
 213         return 0;
 214 }
 215 EXPORT_SYMBOL(ttm_bo_reserve);
 216
 217 static void ttm_bo_ref_bug(struct kref *list_kref)
 218 {
 219         BUG();
 220 }
 221
 222 int ttm_bo_reserve(struct ttm_buffer_object *bo,
 223                    bool interruptible,
 224                    bool no_wait, bool use_sequence, uint32_t sequence)
 225 {
 226         struct ttm_bo_global *glob = bo->glob;
 227         int put_count = 0;
 228         int ret;
 229
 230         spin_lock(&glob->lru_lock);
 231         ret = ttm_bo_reserve_locked(bo, interruptible, no_wait, use_sequence,
 232                                     sequence);
 233         if (likely(ret == 0))
 234                 put_count = ttm_bo_del_from_lru(bo);
 235         spin_unlock(&glob->lru_lock);
 236
 237         while (put_count--)
 238                 kref_put(&bo->list_kref, ttm_bo_ref_bug);
 239
 240         return ret;
 241 }
 242
 243 void ttm_bo_unreserve(struct ttm_buffer_object *bo)
 244 {
 245         struct ttm_bo_global *glob = bo->glob;
 246
 247         spin_lock(&glob->lru_lock);
 248         ttm_bo_add_to_lru(bo);
 249         atomic_set(&bo->reserved, 0);
 250         wake_up_all(&bo->event_queue);
 251         spin_unlock(&glob->lru_lock);
 252 }
 253 EXPORT_SYMBOL(ttm_bo_unreserve);
 254
 255 /*
 256  * Call bo->mutex locked.
 257  */
 258 static int ttm_bo_add_ttm(struct ttm_buffer_object *bo, bool zero_alloc)
 259 {
 260         struct ttm_bo_device *bdev = bo->bdev;
 261         struct ttm_bo_global *glob = bo->glob;
 262         int ret = 0;
 263         uint32_t page_flags = 0;
 264
 265         TTM_ASSERT_LOCKED(&bo->mutex);
 266         bo->ttm = NULL;
 267
 268         if (bdev->need_dma32)
 269                 page_flags |= TTM_PAGE_FLAG_DMA32;
 270
 271         switch (bo->type) {
 272         case ttm_bo_type_device:
 273                 if (zero_alloc)
 274                         page_flags |= TTM_PAGE_FLAG_ZERO_ALLOC;
 275         case ttm_bo_type_kernel:
 276                 bo->ttm = ttm_tt_create(bdev, bo->num_pages << PAGE_SHIFT,
 277                                         page_flags, glob->dummy_read_page);
 278                 if (unlikely(bo->ttm == NULL))
 279                         ret = -ENOMEM;
 280                 break;
 281         case ttm_bo_type_user:
 282                 bo->ttm = ttm_tt_create(bdev, bo->num_pages << PAGE_SHIFT,
 283                                         page_flags | TTM_PAGE_FLAG_USER,
 284                                         glob->dummy_read_page);
 285                 if (unlikely(bo->ttm == NULL)) {
 286                         ret = -ENOMEM;
 287                         break;
 288                 }
 289
 290                 ret = ttm_tt_set_user(bo->ttm, current,
 291                                       bo->buffer_start, bo->num_pages);
 292                 if (unlikely(ret != 0))
 293                         ttm_tt_destroy(bo->ttm);
 294                 break;
 295         default:
 296                 printk(KERN_ERR TTM_PFX "Illegal buffer object type\n");
 297                 ret = -EINVAL;
 298                 break;
 299         }
 300
 301         return ret;
 302 }
 303
 304 static int ttm_bo_handle_move_mem(struct ttm_buffer_object *bo,
 305                                   struct ttm_mem_reg *mem,
 306                                   bool evict, bool interruptible, bool no_wait)
 307 {
 308         struct ttm_bo_device *bdev = bo->bdev;
 309         bool old_is_pci = ttm_mem_reg_is_pci(bdev, &bo->mem);
 310         bool new_is_pci = ttm_mem_reg_is_pci(bdev, mem);
 311         struct ttm_mem_type_manager *old_man = &bdev->man[bo->mem.mem_type];
 312         struct ttm_mem_type_manager *new_man = &bdev->man[mem->mem_type];
 313         int ret = 0;
 314
 315         if (old_is_pci || new_is_pci ||
 316             ((mem->placement & bo->mem.placement & TTM_PL_MASK_CACHING) == 0))
 317                 ttm_bo_unmap_virtual(bo);
 318
 319         /*
 320          * Create and bind a ttm if required.
 321          */
 322
 323         if (!(new_man->flags & TTM_MEMTYPE_FLAG_FIXED) && (bo->ttm == NULL)) {
 324                 ret = ttm_bo_add_ttm(bo, false);
 325                 if (ret)
 326                         goto out_err;
 327
 328                 ret = ttm_tt_set_placement_caching(bo->ttm, mem->placement);
 329                 if (ret)
 330                         goto out_err;
 331
 332                 if (mem->mem_type != TTM_PL_SYSTEM) {
 333                         ret = ttm_tt_bind(bo->ttm, mem);
 334                         if (ret)
 335                                 goto out_err;
 336                 }
 337
 338                 if (bo->mem.mem_type == TTM_PL_SYSTEM) {
 339                         bo->mem = *mem;
 340                         mem->mm_node = NULL;
 341                         goto moved;
 342                 }
 343
 344         }
 345
 346         if (bdev->driver->move_notify)
 347                 bdev->driver->move_notify(bo, mem);
 348
 349         if (!(old_man->flags & TTM_MEMTYPE_FLAG_FIXED) &&
 350             !(new_man->flags & TTM_MEMTYPE_FLAG_FIXED))
 351                 ret = ttm_bo_move_ttm(bo, evict, no_wait, mem);
 352         else if (bdev->driver->move)
 353                 ret = bdev->driver->move(bo, evict, interruptible,
 354                                          no_wait, mem);
 355         else
 356                 ret = ttm_bo_move_memcpy(bo, evict, no_wait, mem);
 357
 358         if (ret)
 359                 goto out_err;
 360
 361 moved:
 362         if (bo->evicted) {
 363                 ret = bdev->driver->invalidate_caches(bdev, bo->mem.placement);
 364                 if (ret)
 365                         printk(KERN_ERR TTM_PFX "Can not flush read caches\n");
 366                 bo->evicted = false;
 367         }
 368
 369         if (bo->mem.mm_node) {
 370                 spin_lock(&bo->lock);
 371                 bo->offset = (bo->mem.mm_node->start << PAGE_SHIFT) +
 372                     bdev->man[bo->mem.mem_type].gpu_offset;
 373                 bo->cur_placement = bo->mem.placement;
 374                 spin_unlock(&bo->lock);
 375         }
 376
 377         return 0;
 378
 379 out_err:
 380         new_man = &bdev->man[bo->mem.mem_type];
 381         if ((new_man->flags & TTM_MEMTYPE_FLAG_FIXED) && bo->ttm) {
 382                 ttm_tt_unbind(bo->ttm);
 383                 ttm_tt_destroy(bo->ttm);
 384                 bo->ttm = NULL;
 385         }
 386
 387         return ret;
 388 }
 389
 390 /**
 391  * If bo idle, remove from delayed- and lru lists, and unref.
 392  * If not idle, and already on delayed list, do nothing.
 393  * If not idle, and not on delayed list, put on delayed list,
 394  *   up the list_kref and schedule a delayed list check.
 395  */
 396
 397 static int ttm_bo_cleanup_refs(struct ttm_buffer_object *bo, bool remove_all)
 398 {
 399         struct ttm_bo_device *bdev = bo->bdev;
 400         struct ttm_bo_global *glob = bo->glob;
 401         struct ttm_bo_driver *driver = bdev->driver;
 402         int ret;
 403
 404         spin_lock(&bo->lock);
 405         (void) ttm_bo_wait(bo, false, false, !remove_all);
 406
 407         if (!bo->sync_obj) {
 408                 int put_count;
 409
 410                 spin_unlock(&bo->lock);
 411
 412                 spin_lock(&glob->lru_lock);
 413                 ret = ttm_bo_reserve_locked(bo, false, false, false, 0);
 414                 BUG_ON(ret);
 415                 if (bo->ttm)
 416                         ttm_tt_unbind(bo->ttm);
 417
 418                 if (!list_empty(&bo->ddestroy)) {
 419                         list_del_init(&bo->ddestroy);
 420                         kref_put(&bo->list_kref, ttm_bo_ref_bug);
 421                 }
 422                 if (bo->mem.mm_node) {
 423                         bo->mem.mm_node->private = NULL;
 424                         drm_mm_put_block(bo->mem.mm_node);
 425                         bo->mem.mm_node = NULL;
 426                 }
 427                 put_count = ttm_bo_del_from_lru(bo);
 428                 spin_unlock(&glob->lru_lock);
 429
 430                 atomic_set(&bo->reserved, 0);
 431
 432                 while (put_count--)
 433                         kref_put(&bo->list_kref, ttm_bo_release_list);
 434
 435                 return 0;
 436         }
 437
 438         spin_lock(&glob->lru_lock);
 439         if (list_empty(&bo->ddestroy)) {
 440                 void *sync_obj = bo->sync_obj;
 441                 void *sync_obj_arg = bo->sync_obj_arg;
 442
 443                 kref_get(&bo->list_kref);
 444                 list_add_tail(&bo->ddestroy, &bdev->ddestroy);
 445                 spin_unlock(&glob->lru_lock);
 446                 spin_unlock(&bo->lock);
 447
 448                 if (sync_obj)
 449                         driver->sync_obj_flush(sync_obj, sync_obj_arg);
 450                 schedule_delayed_work(&bdev->wq,
 451                                       ((HZ / 100) < 1) ? 1 : HZ / 100);
 452                 ret = 0;
 453
 454         } else {
 455                 spin_unlock(&glob->lru_lock);
 456                 spin_unlock(&bo->lock);
 457                 ret = -EBUSY;
 458         }
 459
 460         return ret;
 461 }
 462
 463 /**
 464  * Traverse the delayed list, and call ttm_bo_cleanup_refs on all
 465  * encountered buffers.
 466  */
 467
 468 static int ttm_bo_delayed_delete(struct ttm_bo_device *bdev, bool remove_all)
 469 {
 470         struct ttm_bo_global *glob = bdev->glob;
 471         struct ttm_buffer_object *entry, *nentry;
 472         struct list_head *list, *next;
 473         int ret;
 474
 475         spin_lock(&glob->lru_lock);
 476         list_for_each_safe(list, next, &bdev->ddestroy) {
 477                 entry = list_entry(list, struct ttm_buffer_object, ddestroy);
 478                 nentry = NULL;
 479
 480                 /*
 481                  * Protect the next list entry from destruction while we
 482                  * unlock the lru_lock.
 483                  */
 484
 485                 if (next != &bdev->ddestroy) {
 486                         nentry = list_entry(next, struct ttm_buffer_object,
 487                                             ddestroy);
 488                         kref_get(&nentry->list_kref);
 489                 }
 490                 kref_get(&entry->list_kref);
 491
 492                 spin_unlock(&glob->lru_lock);
 493                 ret = ttm_bo_cleanup_refs(entry, remove_all);
 494                 kref_put(&entry->list_kref, ttm_bo_release_list);
 495
 496                 spin_lock(&glob->lru_lock);
 497                 if (nentry) {
 498                         bool next_onlist = !list_empty(next);
 499                         spin_unlock(&glob->lru_lock);
 500                         kref_put(&nentry->list_kref, ttm_bo_release_list);
 501                         spin_lock(&glob->lru_lock);
 502                         /*
 503                          * Someone might have raced us and removed the
 504                          * next entry from the list. We don't bother restarting
 505                          * list traversal.
 506                          */
 507
 508                         if (!next_onlist)
 509                                 break;
 510                 }
 511                 if (ret)
 512                         break;
 513         }
 514         ret = !list_empty(&bdev->ddestroy);
 515         spin_unlock(&glob->lru_lock);
 516
 517         return ret;
 518 }
 519
 520 static void ttm_bo_delayed_workqueue(struct work_struct *work)
 521 {
 522         struct ttm_bo_device *bdev =
 523             container_of(work, struct ttm_bo_device, wq.work);
 524
 525         if (ttm_bo_delayed_delete(bdev, false)) {
 526                 schedule_delayed_work(&bdev->wq,
 527                                       ((HZ / 100) < 1) ? 1 : HZ / 100);
 528         }
 529 }
 530
 531 static void ttm_bo_release(struct kref *kref)
 532 {
 533         struct ttm_buffer_object *bo =
 534             container_of(kref, struct ttm_buffer_object, kref);
 535         struct ttm_bo_device *bdev = bo->bdev;
 536
 537         if (likely(bo->vm_node != NULL)) {
 538                 rb_erase(&bo->vm_rb, &bdev->addr_space_rb);
 539                 drm_mm_put_block(bo->vm_node);
 540                 bo->vm_node = NULL;
 541         }
 542         write_unlock(&bdev->vm_lock);
 543         ttm_bo_cleanup_refs(bo, false);
 544         kref_put(&bo->list_kref, ttm_bo_release_list);
 545         write_lock(&bdev->vm_lock);
 546 }
 547
 548 void ttm_bo_unref(struct ttm_buffer_object **p_bo)
 549 {
 550         struct ttm_buffer_object *bo = *p_bo;
 551         struct ttm_bo_device *bdev = bo->bdev;
 552
 553         *p_bo = NULL;
 554         write_lock(&bdev->vm_lock);
 555         kref_put(&bo->kref, ttm_bo_release);
 556         write_unlock(&bdev->vm_lock);
 557 }
 558 EXPORT_SYMBOL(ttm_bo_unref);
 559
 560 static int ttm_bo_evict(struct ttm_buffer_object *bo, bool interruptible,
 561                         bool no_wait)
 562 {
 563         struct ttm_bo_device *bdev = bo->bdev;
 564         struct ttm_bo_global *glob = bo->glob;
 565         struct ttm_mem_reg evict_mem;
 566         struct ttm_placement placement;
 567         int ret = 0;
 568
 569         spin_lock(&bo->lock);
 570         ret = ttm_bo_wait(bo, false, interruptible, no_wait);
 571         spin_unlock(&bo->lock);
 572
 573         if (unlikely(ret != 0)) {
 574                 if (ret != -ERESTART) {
 575                         printk(KERN_ERR TTM_PFX
 576                                "Failed to expire sync object before "
 577                                "buffer eviction.\n");
 578                 }
 579                 goto out;
 580         }
 581
 582         BUG_ON(!atomic_read(&bo->reserved));
 583
 584         evict_mem = bo->mem;
 585         evict_mem.mm_node = NULL;
 586
 587         bdev->driver->evict_flags(bo, &placement);
 588         ret = ttm_bo_mem_space(bo, &placement, &evict_mem, interruptible,
 589                                 no_wait);
 590         if (ret) {
 591                 if (ret != -ERESTART)
 592                         printk(KERN_ERR TTM_PFX
 593                                "Failed to find memory space for "
 594                                "buffer 0x%p eviction.\n", bo);
 595                 goto out;
 596         }
 597
 598         ret = ttm_bo_handle_move_mem(bo, &evict_mem, true, interruptible,
 599                                      no_wait);
 600         if (ret) {
 601                 if (ret != -ERESTART)
 602                         printk(KERN_ERR TTM_PFX "Buffer eviction failed\n");
 603                 spin_lock(&glob->lru_lock);
 604                 if (evict_mem.mm_node) {
 605                         evict_mem.mm_node->private = NULL;
 606                         drm_mm_put_block(evict_mem.mm_node);
 607                         evict_mem.mm_node = NULL;
 608                 }
 609                 spin_unlock(&glob->lru_lock);
 610                 goto out;
 611         }
 612         bo->evicted = true;
 613 out:
 614         return ret;
 615 }
 616
 617 static int ttm_mem_evict_first(struct ttm_bo_device *bdev,
 618                                 uint32_t mem_type,
 619                                 bool interruptible, bool no_wait)
 620 {
 621         struct ttm_bo_global *glob = bdev->glob;
 622         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
 623         struct ttm_buffer_object *bo;
 624         int ret, put_count = 0;
 625
 626         spin_lock(&glob->lru_lock);
 627         bo = list_first_entry(&man->lru, struct ttm_buffer_object, lru);
 628         kref_get(&bo->list_kref);
 629         ret = ttm_bo_reserve_locked(bo, interruptible, no_wait, false, 0);
 630         if (likely(ret == 0))
 631                 put_count = ttm_bo_del_from_lru(bo);
 632         spin_unlock(&glob->lru_lock);
 633         if (unlikely(ret != 0))
 634                 return ret;
 635         while (put_count--)
 636                 kref_put(&bo->list_kref, ttm_bo_ref_bug);
 637         ret = ttm_bo_evict(bo, interruptible, no_wait);
 638         ttm_bo_unreserve(bo);
 639         kref_put(&bo->list_kref, ttm_bo_release_list);
 640         return ret;
 641 }
 642
 643 static int ttm_bo_man_get_node(struct ttm_buffer_object *bo,
 644                                 struct ttm_mem_type_manager *man,
 645                                 struct ttm_placement *placement,
 646                                 struct ttm_mem_reg *mem,
 647                                 struct drm_mm_node **node)
 648 {
 649         struct ttm_bo_global *glob = bo->glob;
 650         unsigned long lpfn;
 651         int ret;
 652
 653         lpfn = placement->lpfn;
 654         if (!lpfn)
 655                 lpfn = man->size;
 656         *node = NULL;
 657         do {
 658                 ret = drm_mm_pre_get(&man->manager);
 659                 if (unlikely(ret))
 660                         return ret;
 661
 662                 spin_lock(&glob->lru_lock);
 663                 *node = drm_mm_search_free_in_range(&man->manager,
 664                                         mem->num_pages, mem->page_alignment,
 665                                         placement->fpfn, lpfn, 1);
 666                 if (unlikely(*node == NULL)) {
 667                         spin_unlock(&glob->lru_lock);
 668                         return 0;
 669                 }
 670                 *node = drm_mm_get_block_atomic_range(*node, mem->num_pages,
 671                                                         mem->page_alignment,
 672                                                         placement->fpfn,
 673                                                         lpfn);
 674                 spin_unlock(&glob->lru_lock);
 675         } while (*node == NULL);
 676         return 0;
 677 }
 678
 679 /**
 680  * Repeatedly evict memory from the LRU for @mem_type until we create enough
 681  * space, or we've evicted everything and there isn't enough space.
 682  */
 683 static int ttm_bo_mem_force_space(struct ttm_buffer_object *bo,
 684                                         uint32_t mem_type,
 685                                         struct ttm_placement *placement,
 686                                         struct ttm_mem_reg *mem,
 687                                         bool interruptible, bool no_wait)
 688 {
 689         struct ttm_bo_device *bdev = bo->bdev;
 690         struct ttm_bo_global *glob = bdev->glob;
 691         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
 692         struct drm_mm_node *node;
 693         int ret;
 694
 695         do {
 696                 ret = ttm_bo_man_get_node(bo, man, placement, mem, &node);
 697                 if (unlikely(ret != 0))
 698                         return ret;
 699                 if (node)
 700                         break;
 701                 spin_lock(&glob->lru_lock);
 702                 if (list_empty(&man->lru)) {
 703                         spin_unlock(&glob->lru_lock);
 704                         break;
 705                 }
 706                 spin_unlock(&glob->lru_lock);
 707                 ret = ttm_mem_evict_first(bdev, mem_type, interruptible,
 708                                                 no_wait);
 709                 if (unlikely(ret != 0))
 710                         return ret;
 711         } while (1);
 712         if (node == NULL)
 713                 return -ENOMEM;
 714         mem->mm_node = node;
 715         mem->mem_type = mem_type;
 716         return 0;
 717 }
 718
 719 static uint32_t ttm_bo_select_caching(struct ttm_mem_type_manager *man,
 720                                       uint32_t cur_placement,
 721                                       uint32_t proposed_placement)
 722 {
 723         uint32_t caching = proposed_placement & TTM_PL_MASK_CACHING;
 724         uint32_t result = proposed_placement & ~TTM_PL_MASK_CACHING;
 725
 726         /**
 727          * Keep current caching if possible.
 728          */
 729
 730         if ((cur_placement & caching) != 0)
 731                 result |= (cur_placement & caching);
 732         else if ((man->default_caching & caching) != 0)
 733                 result |= man->default_caching;
 734         else if ((TTM_PL_FLAG_CACHED & caching) != 0)
 735                 result |= TTM_PL_FLAG_CACHED;
 736         else if ((TTM_PL_FLAG_WC & caching) != 0)
 737                 result |= TTM_PL_FLAG_WC;
 738         else if ((TTM_PL_FLAG_UNCACHED & caching) != 0)
 739                 result |= TTM_PL_FLAG_UNCACHED;
 740
 741         return result;
 742 }
 743
 744 static bool ttm_bo_mt_compatible(struct ttm_mem_type_manager *man,
 745                                  bool disallow_fixed,
 746                                  uint32_t mem_type,
 747                                  uint32_t proposed_placement,
 748                                  uint32_t *masked_placement)
 749 {
 750         uint32_t cur_flags = ttm_bo_type_flags(mem_type);
 751
 752         if ((man->flags & TTM_MEMTYPE_FLAG_FIXED) && disallow_fixed)
 753                 return false;
 754
 755         if ((cur_flags & proposed_placement & TTM_PL_MASK_MEM) == 0)
 756                 return false;
 757
 758         if ((proposed_placement & man->available_caching) == 0)
 759                 return false;
 760
 761         cur_flags |= (proposed_placement & man->available_caching);
 762
 763         *masked_placement = cur_flags;
 764         return true;
 765 }
 766
 767 static inline int ttm_mem_type_from_flags(uint32_t flags, uint32_t *mem_type)
 768 {
 769         int i;
 770
 771         for (i = 0; i <= TTM_PL_PRIV5; i++)
 772                 if (flags & (1 << i)) {
 773                         *mem_type = i;
 774                         return 0;
 775                 }
 776         return -EINVAL;
 777 }
 778
 779 /**
 780  * Creates space for memory region @mem according to its type.
 781  *
 782  * This function first searches for free space in compatible memory types in
 783  * the priority order defined by the driver.  If free space isn't found, then
 784  * ttm_bo_mem_force_space is attempted in priority order to evict and find
 785  * space.
 786  */
 787 int ttm_bo_mem_space(struct ttm_buffer_object *bo,
 788                         struct ttm_placement *placement,
 789                         struct ttm_mem_reg *mem,
 790                         bool interruptible, bool no_wait)
 791 {
 792         struct ttm_bo_device *bdev = bo->bdev;
 793         struct ttm_mem_type_manager *man;
 794         uint32_t mem_type = TTM_PL_SYSTEM;
 795         uint32_t cur_flags = 0;
 796         bool type_found = false;
 797         bool type_ok = false;
 798         bool has_eagain = false;
 799         struct drm_mm_node *node = NULL;
 800         int i, ret;
 801
 802         mem->mm_node = NULL;
 803         for (i = 0; i <= placement->num_placement; ++i) {
 804                 ret = ttm_mem_type_from_flags(placement->placement[i],
 805                                                 &mem_type);
 806                 if (ret)
 807                         return ret;
 808                 man = &bdev->man[mem_type];
 809
 810                 type_ok = ttm_bo_mt_compatible(man,
 811                                                 bo->type == ttm_bo_type_user,
 812                                                 mem_type,
 813                                                 placement->placement[i],
 814                                                 &cur_flags);
 815
 816                 if (!type_ok)
 817                         continue;
 818
 819                 cur_flags = ttm_bo_select_caching(man, bo->mem.placement,
 820                                                   cur_flags);
 821                 /*
 822                  * Use the access and other non-mapping-related flag bits from
 823                  * the memory placement flags to the current flags
 824                  */
 825                 ttm_flag_masked(&cur_flags, placement->placement[i],
 826                                 ~TTM_PL_MASK_MEMTYPE);
 827
 828                 if (mem_type == TTM_PL_SYSTEM)
 829                         break;
 830
 831                 if (man->has_type && man->use_type) {
 832                         type_found = true;
 833                         ret = ttm_bo_man_get_node(bo, man, placement, mem,
 834                                                         &node);
 835                         if (unlikely(ret))
 836                                 return ret;
 837                 }
 838                 if (node)
 839                         break;
 840         }
 841
 842         if ((type_ok && (mem_type == TTM_PL_SYSTEM)) || node) {
 843                 mem->mm_node = node;
 844                 mem->mem_type = mem_type;
 845                 mem->placement = cur_flags;
 846                 if (node)
 847                         node->private = bo;
 848                 return 0;
 849         }
 850
 851         if (!type_found)
 852                 return -EINVAL;
 853
 854         for (i = 0; i <= placement->num_busy_placement; ++i) {
 855                 ret = ttm_mem_type_from_flags(placement->placement[i],
 856                                                 &mem_type);
 857                 if (ret)
 858                         return ret;
 859                 man = &bdev->man[mem_type];
 860                 if (!man->has_type)
 861                         continue;
 862                 if (!ttm_bo_mt_compatible(man,
 863                                                 bo->type == ttm_bo_type_user,
 864                                                 mem_type,
 865                                                 placement->placement[i],
 866                                                 &cur_flags))
 867                         continue;
 868
 869                 cur_flags = ttm_bo_select_caching(man, bo->mem.placement,
 870                                                   cur_flags);
 871                 /*
 872                  * Use the access and other non-mapping-related flag bits from
 873                  * the memory placement flags to the current flags
 874                  */
 875                 ttm_flag_masked(&cur_flags, placement->placement[i],
 876                                 ~TTM_PL_MASK_MEMTYPE);
 877
 878                 ret = ttm_bo_mem_force_space(bo, mem_type, placement, mem,
 879                                                 interruptible, no_wait);
 880                 if (ret == 0 && mem->mm_node) {
 881                         mem->placement = cur_flags;
 882                         mem->mm_node->private = bo;
 883                         return 0;
 884                 }
 885                 if (ret == -ERESTART)
 886                         has_eagain = true;
 887         }
 888         ret = (has_eagain) ? -ERESTART : -ENOMEM;
 889         return ret;
 890 }
 891 EXPORT_SYMBOL(ttm_bo_mem_space);
 892
 893 int ttm_bo_wait_cpu(struct ttm_buffer_object *bo, bool no_wait)
 894 {
 895         int ret = 0;
 896
 897         if ((atomic_read(&bo->cpu_writers) > 0) && no_wait)
 898                 return -EBUSY;
 899
 900         ret = wait_event_interruptible(bo->event_queue,
 901                                        atomic_read(&bo->cpu_writers) == 0);
 902
 903         if (ret == -ERESTARTSYS)
 904                 ret = -ERESTART;
 905
 906         return ret;
 907 }
 908
 909 int ttm_bo_move_buffer(struct ttm_buffer_object *bo,
 910                         struct ttm_placement *placement,
 911                         bool interruptible, bool no_wait)
 912 {
 913         struct ttm_bo_global *glob = bo->glob;
 914         int ret = 0;
 915         struct ttm_mem_reg mem;
 916
 917         BUG_ON(!atomic_read(&bo->reserved));
 918
 919         /*
 920          * FIXME: It's possible to pipeline buffer moves.
 921          * Have the driver move function wait for idle when necessary,
 922          * instead of doing it here.
 923          */
 924         spin_lock(&bo->lock);
 925         ret = ttm_bo_wait(bo, false, interruptible, no_wait);
 926         spin_unlock(&bo->lock);
 927         if (ret)
 928                 return ret;
 929         mem.num_pages = bo->num_pages;
 930         mem.size = mem.num_pages << PAGE_SHIFT;
 931         mem.page_alignment = bo->mem.page_alignment;
 932         /*
 933          * Determine where to move the buffer.
 934          */
 935         ret = ttm_bo_mem_space(bo, placement, &mem, interruptible, no_wait);
 936         if (ret)
 937                 goto out_unlock;
 938         ret = ttm_bo_handle_move_mem(bo, &mem, false, interruptible, no_wait);
 939 out_unlock:
 940         if (ret && mem.mm_node) {
 941                 spin_lock(&glob->lru_lock);
 942                 mem.mm_node->private = NULL;
 943                 drm_mm_put_block(mem.mm_node);
 944                 spin_unlock(&glob->lru_lock);
 945         }
 946         return ret;
 947 }
 948
 949 static int ttm_bo_mem_compat(struct ttm_placement *placement,
 950                              struct ttm_mem_reg *mem)
 951 {
 952         int i;
 953
 954         for (i = 0; i < placement->num_placement; i++) {
 955                 if ((placement->placement[i] & mem->placement &
 956                         TTM_PL_MASK_CACHING) &&
 957                         (placement->placement[i] & mem->placement &
 958                         TTM_PL_MASK_MEM))
 959                         return i;
 960         }
 961         return -1;
 962 }
 963
 964 int ttm_buffer_object_validate(struct ttm_buffer_object *bo,
 965                                 struct ttm_placement *placement,
 966                                 bool interruptible, bool no_wait)
 967 {
 968         int ret;
 969
 970         BUG_ON(!atomic_read(&bo->reserved));
 971         /* Check that range is valid */
 972         if (placement->lpfn || placement->fpfn)
 973                 if (placement->fpfn > placement->lpfn ||
 974                         (placement->lpfn - placement->fpfn) < bo->num_pages)
 975                         return -EINVAL;
 976         /*
 977          * Check whether we need to move buffer.
 978          */
 979         ret = ttm_bo_mem_compat(placement, &bo->mem);
 980         if (ret < 0) {
 981                 ret = ttm_bo_move_buffer(bo, placement, interruptible, no_wait);
 982                 if (ret)
 983                         return ret;
 984         } else {
 985                 /*
 986                  * Use the access and other non-mapping-related flag bits from
 987                  * the compatible memory placement flags to the active flags
 988                  */
 989                 ttm_flag_masked(&bo->mem.placement, placement->placement[ret],
 990                                 ~TTM_PL_MASK_MEMTYPE);
 991         }
 992         /*
 993          * We might need to add a TTM.
 994          */
 995         if (bo->mem.mem_type == TTM_PL_SYSTEM && bo->ttm == NULL) {
 996                 ret = ttm_bo_add_ttm(bo, true);
 997                 if (ret)
 998                         return ret;
 999         }
1000         return 0;
1001 }
1002 EXPORT_SYMBOL(ttm_buffer_object_validate);
1003
1004 int
1005 ttm_bo_check_placement(struct ttm_buffer_object *bo,
1006                        uint32_t set_flags, uint32_t clr_flags)
1007 {
1008         uint32_t new_mask = set_flags | clr_flags;
1009
1010         if ((bo->type == ttm_bo_type_user) &&
1011             (clr_flags & TTM_PL_FLAG_CACHED)) {
1012                 printk(KERN_ERR TTM_PFX
1013                        "User buffers require cache-coherent memory.\n");
1014                 return -EINVAL;
1015         }
1016
1017         if (!capable(CAP_SYS_ADMIN)) {
1018                 if (new_mask & TTM_PL_FLAG_NO_EVICT) {
1019                         printk(KERN_ERR TTM_PFX "Need to be root to modify"
1020                                " NO_EVICT status.\n");
1021                         return -EINVAL;
1022                 }
1023
1024                 if ((clr_flags & bo->mem.placement & TTM_PL_MASK_MEMTYPE) &&
1025                     (bo->mem.placement & TTM_PL_FLAG_NO_EVICT)) {
1026                         printk(KERN_ERR TTM_PFX
1027                                "Incompatible memory specification"
1028                                " for NO_EVICT buffer.\n");
1029                         return -EINVAL;
1030                 }
1031         }
1032         return 0;
1033 }
1034
1035 int ttm_buffer_object_init(struct ttm_bo_device *bdev,
1036                            struct ttm_buffer_object *bo,
1037                            unsigned long size,
1038                            enum ttm_bo_type type,
1039                            uint32_t flags,
1040                            uint32_t page_alignment,
1041                            unsigned long buffer_start,
1042                            bool interruptible,
1043                            struct file *persistant_swap_storage,
1044                            size_t acc_size,
1045                            void (*destroy) (struct ttm_buffer_object *))
1046 {
1047         int i, c, ret = 0;
1048         unsigned long num_pages;
1049         uint32_t placements[8];
1050         struct ttm_placement placement;
1051
1052         size += buffer_start & ~PAGE_MASK;
1053         num_pages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
1054         if (num_pages == 0) {
1055                 printk(KERN_ERR TTM_PFX "Illegal buffer object size.\n");
1056                 return -EINVAL;
1057         }
1058         bo->destroy = destroy;
1059
1060         spin_lock_init(&bo->lock);
1061         kref_init(&bo->kref);
1062         kref_init(&bo->list_kref);
1063         atomic_set(&bo->cpu_writers, 0);
1064         atomic_set(&bo->reserved, 1);
1065         init_waitqueue_head(&bo->event_queue);
1066         INIT_LIST_HEAD(&bo->lru);
1067         INIT_LIST_HEAD(&bo->ddestroy);
1068         INIT_LIST_HEAD(&bo->swap);
1069         bo->bdev = bdev;
1070         bo->glob = bdev->glob;
1071         bo->type = type;
1072         bo->num_pages = num_pages;
1073         bo->mem.mem_type = TTM_PL_SYSTEM;
1074         bo->mem.num_pages = bo->num_pages;
1075         bo->mem.mm_node = NULL;
1076         bo->mem.page_alignment = page_alignment;
1077         bo->buffer_start = buffer_start & PAGE_MASK;
1078         bo->priv_flags = 0;
1079         bo->mem.placement = (TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED);
1080         bo->seq_valid = false;
1081         bo->persistant_swap_storage = persistant_swap_storage;
1082         bo->acc_size = acc_size;
1083         atomic_inc(&bo->glob->bo_count);
1084
1085         ret = ttm_bo_check_placement(bo, flags, 0ULL);
1086         if (unlikely(ret != 0))
1087                 goto out_err;
1088
1089         /*
1090          * If no caching attributes are set, accept any form of caching.
1091          */
1092
1093         if ((flags & TTM_PL_MASK_CACHING) == 0)
1094                 flags |= TTM_PL_MASK_CACHING;
1095
1096         /*
1097          * For ttm_bo_type_device buffers, allocate
1098          * address space from the device.
1099          */
1100
1101         if (bo->type == ttm_bo_type_device) {
1102                 ret = ttm_bo_setup_vm(bo);
1103                 if (ret)
1104                         goto out_err;
1105         }
1106
1107         placement.fpfn = 0;
1108         placement.lpfn = 0;
1109         for (i = 0, c = 0; i <= TTM_PL_PRIV5; i++)
1110                 if (flags & (1 << i))
1111                         placements[c++] = (flags & ~TTM_PL_MASK_MEM) | (1 << i);
1112         placement.placement = placements;
1113         placement.num_placement = c;
1114         placement.busy_placement = placements;
1115         placement.num_busy_placement = c;
1116         ret = ttm_buffer_object_validate(bo, &placement, interruptible, false);
1117         if (ret)
1118                 goto out_err;
1119
1120         ttm_bo_unreserve(bo);
1121         return 0;
1122
1123 out_err:
1124         ttm_bo_unreserve(bo);
1125         ttm_bo_unref(&bo);
1126
1127         return ret;
1128 }
1129 EXPORT_SYMBOL(ttm_buffer_object_init);
1130
1131 static inline size_t ttm_bo_size(struct ttm_bo_global *glob,
1132                                  unsigned long num_pages)
1133 {
1134         size_t page_array_size = (num_pages * sizeof(void *) + PAGE_SIZE - 1) &
1135             PAGE_MASK;
1136
1137         return glob->ttm_bo_size + 2 * page_array_size;
1138 }
1139
1140 int ttm_buffer_object_create(struct ttm_bo_device *bdev,
1141                              unsigned long size,
1142                              enum ttm_bo_type type,
1143                              uint32_t flags,
1144                              uint32_t page_alignment,
1145                              unsigned long buffer_start,
1146                              bool interruptible,
1147                              struct file *persistant_swap_storage,
1148                              struct ttm_buffer_object **p_bo)
1149 {
1150         struct ttm_buffer_object *bo;
1151         struct ttm_mem_global *mem_glob = bdev->glob->mem_glob;
1152         int ret;
1153
1154         size_t acc_size =
1155             ttm_bo_size(bdev->glob, (size + PAGE_SIZE - 1) >> PAGE_SHIFT);
1156         ret = ttm_mem_global_alloc(mem_glob, acc_size, false, false);
1157         if (unlikely(ret != 0))
1158                 return ret;
1159
1160         bo = kzalloc(sizeof(*bo), GFP_KERNEL);
1161
1162         if (unlikely(bo == NULL)) {
1163                 ttm_mem_global_free(mem_glob, acc_size);
1164                 return -ENOMEM;
1165         }
1166
1167         ret = ttm_buffer_object_init(bdev, bo, size, type, flags,
1168                                      page_alignment, buffer_start,
1169                                      interruptible,
1170                                      persistant_swap_storage, acc_size, NULL);
1171         if (likely(ret == 0))
1172                 *p_bo = bo;
1173
1174         return ret;
1175 }
1176
1177 static int ttm_bo_force_list_clean(struct ttm_bo_device *bdev,
1178                                         unsigned mem_type, bool allow_errors)
1179 {
1180         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
1181         struct ttm_bo_global *glob = bdev->glob;
1182         int ret;
1183
1184         /*
1185          * Can't use standard list traversal since we're unlocking.
1186          */
1187
1188         spin_lock(&glob->lru_lock);
1189         while (!list_empty(&man->lru)) {
1190                 spin_unlock(&glob->lru_lock);
1191                 ret = ttm_mem_evict_first(bdev, mem_type, false, false);
1192                 if (ret) {
1193                         if (allow_errors) {
1194                                 return ret;
1195                         } else {
1196                                 printk(KERN_ERR TTM_PFX
1197                                         "Cleanup eviction failed\n");
1198                         }
1199                 }
1200                 spin_lock(&glob->lru_lock);
1201         }
1202         spin_unlock(&glob->lru_lock);
1203         return 0;
1204 }
1205
1206 int ttm_bo_clean_mm(struct ttm_bo_device *bdev, unsigned mem_type)
1207 {
1208         struct ttm_bo_global *glob = bdev->glob;
1209         struct ttm_mem_type_manager *man;
1210         int ret = -EINVAL;
1211
1212         if (mem_type >= TTM_NUM_MEM_TYPES) {
1213                 printk(KERN_ERR TTM_PFX "Illegal memory type %d\n", mem_type);
1214                 return ret;
1215         }
1216         man = &bdev->man[mem_type];
1217
1218         if (!man->has_type) {
1219                 printk(KERN_ERR TTM_PFX "Trying to take down uninitialized "
1220                        "memory manager type %u\n", mem_type);
1221                 return ret;
1222         }
1223
1224         man->use_type = false;
1225         man->has_type = false;
1226
1227         ret = 0;
1228         if (mem_type > 0) {
1229                 ttm_bo_force_list_clean(bdev, mem_type, false);
1230
1231                 spin_lock(&glob->lru_lock);
1232                 if (drm_mm_clean(&man->manager))
1233                         drm_mm_takedown(&man->manager);
1234                 else
1235                         ret = -EBUSY;
1236
1237                 spin_unlock(&glob->lru_lock);
1238         }
1239
1240         return ret;
1241 }
1242 EXPORT_SYMBOL(ttm_bo_clean_mm);
1243
1244 int ttm_bo_evict_mm(struct ttm_bo_device *bdev, unsigned mem_type)
1245 {
1246         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
1247
1248         if (mem_type == 0 || mem_type >= TTM_NUM_MEM_TYPES) {
1249                 printk(KERN_ERR TTM_PFX
1250                        "Illegal memory manager memory type %u.\n",
1251                        mem_type);
1252                 return -EINVAL;
1253         }
1254
1255         if (!man->has_type) {
1256                 printk(KERN_ERR TTM_PFX
1257                        "Memory type %u has not been initialized.\n",
1258                        mem_type);
1259                 return 0;
1260         }
1261
1262         return ttm_bo_force_list_clean(bdev, mem_type, true);
1263 }
1264 EXPORT_SYMBOL(ttm_bo_evict_mm);
1265
1266 int ttm_bo_init_mm(struct ttm_bo_device *bdev, unsigned type,
1267                         unsigned long p_size)
1268 {
1269         int ret = -EINVAL;
1270         struct ttm_mem_type_manager *man;
1271
1272         if (type >= TTM_NUM_MEM_TYPES) {
1273                 printk(KERN_ERR TTM_PFX "Illegal memory type %d\n", type);
1274                 return ret;
1275         }
1276
1277         man = &bdev->man[type];
1278         if (man->has_type) {
1279                 printk(KERN_ERR TTM_PFX
1280                        "Memory manager already initialized for type %d\n",
1281                        type);
1282                 return ret;
1283         }
1284
1285         ret = bdev->driver->init_mem_type(bdev, type, man);
1286         if (ret)
1287                 return ret;
1288
1289         ret = 0;
1290         if (type != TTM_PL_SYSTEM) {
1291                 if (!p_size) {
1292                         printk(KERN_ERR TTM_PFX
1293                                "Zero size memory manager type %d\n",
1294                                type);
1295                         return ret;
1296                 }
1297                 ret = drm_mm_init(&man->manager, 0, p_size);
1298                 if (ret)
1299                         return ret;
1300         }
1301         man->has_type = true;
1302         man->use_type = true;
1303         man->size = p_size;
1304
1305         INIT_LIST_HEAD(&man->lru);
1306
1307         return 0;
1308 }
1309 EXPORT_SYMBOL(ttm_bo_init_mm);
1310
1311 static void ttm_bo_global_kobj_release(struct kobject *kobj)
1312 {
1313         struct ttm_bo_global *glob =
1314                 container_of(kobj, struct ttm_bo_global, kobj);
1315
1316         ttm_mem_unregister_shrink(glob->mem_glob, &glob->shrink);
1317         __free_page(glob->dummy_read_page);
1318         kfree(glob);
1319 }
1320
1321 void ttm_bo_global_release(struct ttm_global_reference *ref)
1322 {
1323         struct ttm_bo_global *glob = ref->object;
1324
1325         kobject_del(&glob->kobj);
1326         kobject_put(&glob->kobj);
1327 }
1328 EXPORT_SYMBOL(ttm_bo_global_release);
1329
1330 int ttm_bo_global_init(struct ttm_global_reference *ref)
1331 {
1332         struct ttm_bo_global_ref *bo_ref =
1333                 container_of(ref, struct ttm_bo_global_ref, ref);
1334         struct ttm_bo_global *glob = ref->object;
1335         int ret;
1336
1337         mutex_init(&glob->device_list_mutex);
1338         spin_lock_init(&glob->lru_lock);
1339         glob->mem_glob = bo_ref->mem_glob;
1340         glob->dummy_read_page = alloc_page(__GFP_ZERO | GFP_DMA32);
1341
1342         if (unlikely(glob->dummy_read_page == NULL)) {
1343                 ret = -ENOMEM;
1344                 goto out_no_drp;
1345         }
1346
1347         INIT_LIST_HEAD(&glob->swap_lru);
1348         INIT_LIST_HEAD(&glob->device_list);
1349
1350         ttm_mem_init_shrink(&glob->shrink, ttm_bo_swapout);
1351         ret = ttm_mem_register_shrink(glob->mem_glob, &glob->shrink);
1352         if (unlikely(ret != 0)) {
1353                 printk(KERN_ERR TTM_PFX
1354                        "Could not register buffer object swapout.\n");
1355                 goto out_no_shrink;
1356         }
1357
1358         glob->ttm_bo_extra_size =
1359                 ttm_round_pot(sizeof(struct ttm_tt)) +
1360                 ttm_round_pot(sizeof(struct ttm_backend));
1361
1362         glob->ttm_bo_size = glob->ttm_bo_extra_size +
1363                 ttm_round_pot(sizeof(struct ttm_buffer_object));
1364
1365         atomic_set(&glob->bo_count, 0);
1366
1367         kobject_init(&glob->kobj, &ttm_bo_glob_kobj_type);
1368         ret = kobject_add(&glob->kobj, ttm_get_kobj(), "buffer_objects");
1369         if (unlikely(ret != 0))
1370                 kobject_put(&glob->kobj);
1371         return ret;
1372 out_no_shrink:
1373         __free_page(glob->dummy_read_page);
1374 out_no_drp:
1375         kfree(glob);
1376         return ret;
1377 }
1378 EXPORT_SYMBOL(ttm_bo_global_init);
1379
1380
1381 int ttm_bo_device_release(struct ttm_bo_device *bdev)
1382 {
1383         int ret = 0;
1384         unsigned i = TTM_NUM_MEM_TYPES;
1385         struct ttm_mem_type_manager *man;
1386         struct ttm_bo_global *glob = bdev->glob;
1387
1388         while (i--) {
1389                 man = &bdev->man[i];
1390                 if (man->has_type) {
1391                         man->use_type = false;
1392                         if ((i != TTM_PL_SYSTEM) && ttm_bo_clean_mm(bdev, i)) {
1393                                 ret = -EBUSY;
1394                                 printk(KERN_ERR TTM_PFX
1395                                        "DRM memory manager type %d "
1396                                        "is not clean.\n", i);
1397                         }
1398                         man->has_type = false;
1399                 }
1400         }
1401
1402         mutex_lock(&glob->device_list_mutex);
1403         list_del(&bdev->device_list);
1404         mutex_unlock(&glob->device_list_mutex);
1405
1406         if (!cancel_delayed_work(&bdev->wq))
1407                 flush_scheduled_work();
1408
1409         while (ttm_bo_delayed_delete(bdev, true))
1410                 ;
1411
1412         spin_lock(&glob->lru_lock);
1413         if (list_empty(&bdev->ddestroy))
1414                 TTM_DEBUG("Delayed destroy list was clean\n");
1415
1416         if (list_empty(&bdev->man[0].lru))
1417                 TTM_DEBUG("Swap list was clean\n");
1418         spin_unlock(&glob->lru_lock);
1419
1420         BUG_ON(!drm_mm_clean(&bdev->addr_space_mm));
1421         write_lock(&bdev->vm_lock);
1422         drm_mm_takedown(&bdev->addr_space_mm);
1423         write_unlock(&bdev->vm_lock);
1424
1425         return ret;
1426 }
1427 EXPORT_SYMBOL(ttm_bo_device_release);
1428
1429 int ttm_bo_device_init(struct ttm_bo_device *bdev,
1430                        struct ttm_bo_global *glob,
1431                        struct ttm_bo_driver *driver,
1432                        uint64_t file_page_offset,
1433                        bool need_dma32)
1434 {
1435         int ret = -EINVAL;
1436
1437         rwlock_init(&bdev->vm_lock);
1438         bdev->driver = driver;
1439
1440         memset(bdev->man, 0, sizeof(bdev->man));
1441
1442         /*
1443          * Initialize the system memory buffer type.
1444          * Other types need to be driver / IOCTL initialized.
1445          */
1446         ret = ttm_bo_init_mm(bdev, TTM_PL_SYSTEM, 0);
1447         if (unlikely(ret != 0))
1448                 goto out_no_sys;
1449
1450         bdev->addr_space_rb = RB_ROOT;
1451         ret = drm_mm_init(&bdev->addr_space_mm, file_page_offset, 0x10000000);
1452         if (unlikely(ret != 0))
1453                 goto out_no_addr_mm;
1454
1455         INIT_DELAYED_WORK(&bdev->wq, ttm_bo_delayed_workqueue);
1456         bdev->nice_mode = true;
1457         INIT_LIST_HEAD(&bdev->ddestroy);
1458         bdev->dev_mapping = NULL;
1459         bdev->glob = glob;
1460         bdev->need_dma32 = need_dma32;
1461
1462         mutex_lock(&glob->device_list_mutex);
1463         list_add_tail(&bdev->device_list, &glob->device_list);
1464         mutex_unlock(&glob->device_list_mutex);
1465
1466         return 0;
1467 out_no_addr_mm:
1468         ttm_bo_clean_mm(bdev, 0);
1469 out_no_sys:
1470         return ret;
1471 }
1472 EXPORT_SYMBOL(ttm_bo_device_init);
1473
1474 /*
1475  * buffer object vm functions.
1476  */
1477
1478 bool ttm_mem_reg_is_pci(struct ttm_bo_device *bdev, struct ttm_mem_reg *mem)
1479 {
1480         struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
1481
1482         if (!(man->flags & TTM_MEMTYPE_FLAG_FIXED)) {
1483                 if (mem->mem_type == TTM_PL_SYSTEM)
1484                         return false;
1485
1486                 if (man->flags & TTM_MEMTYPE_FLAG_CMA)
1487                         return false;
1488
1489                 if (mem->placement & TTM_PL_FLAG_CACHED)
1490                         return false;
1491         }
1492         return true;
1493 }
1494
1495 int ttm_bo_pci_offset(struct ttm_bo_device *bdev,
1496                       struct ttm_mem_reg *mem,
1497                       unsigned long *bus_base,
1498                       unsigned long *bus_offset, unsigned long *bus_size)
1499 {
1500         struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
1501
1502         *bus_size = 0;
1503         if (!(man->flags & TTM_MEMTYPE_FLAG_MAPPABLE))
1504                 return -EINVAL;
1505
1506         if (ttm_mem_reg_is_pci(bdev, mem)) {
1507                 *bus_offset = mem->mm_node->start << PAGE_SHIFT;
1508                 *bus_size = mem->num_pages << PAGE_SHIFT;
1509                 *bus_base = man->io_offset;
1510         }
1511
1512         return 0;
1513 }
1514
1515 void ttm_bo_unmap_virtual(struct ttm_buffer_object *bo)
1516 {
1517         struct ttm_bo_device *bdev = bo->bdev;
1518         loff_t offset = (loff_t) bo->addr_space_offset;
1519         loff_t holelen = ((loff_t) bo->mem.num_pages) << PAGE_SHIFT;
1520
1521         if (!bdev->dev_mapping)
1522                 return;
1523
1524         unmap_mapping_range(bdev->dev_mapping, offset, holelen, 1);
1525 }
1526 EXPORT_SYMBOL(ttm_bo_unmap_virtual);
1527
1528 static void ttm_bo_vm_insert_rb(struct ttm_buffer_object *bo)
1529 {
1530         struct ttm_bo_device *bdev = bo->bdev;
1531         struct rb_node **cur = &bdev->addr_space_rb.rb_node;
1532         struct rb_node *parent = NULL;
1533         struct ttm_buffer_object *cur_bo;
1534         unsigned long offset = bo->vm_node->start;
1535         unsigned long cur_offset;
1536
1537         while (*cur) {
1538                 parent = *cur;
1539                 cur_bo = rb_entry(parent, struct ttm_buffer_object, vm_rb);
1540                 cur_offset = cur_bo->vm_node->start;
1541                 if (offset < cur_offset)
1542                         cur = &parent->rb_left;
1543                 else if (offset > cur_offset)
1544                         cur = &parent->rb_right;
1545                 else
1546                         BUG();
1547         }
1548
1549         rb_link_node(&bo->vm_rb, parent, cur);
1550         rb_insert_color(&bo->vm_rb, &bdev->addr_space_rb);
1551 }
1552
1553 /**
1554  * ttm_bo_setup_vm:
1555  *
1556  * @bo: the buffer to allocate address space for
1557  *
1558  * Allocate address space in the drm device so that applications
1559  * can mmap the buffer and access the contents. This only
1560  * applies to ttm_bo_type_device objects as others are not
1561  * placed in the drm device address space.
1562  */
1563
1564 static int ttm_bo_setup_vm(struct ttm_buffer_object *bo)
1565 {
1566         struct ttm_bo_device *bdev = bo->bdev;
1567         int ret;
1568
1569 retry_pre_get:
1570         ret = drm_mm_pre_get(&bdev->addr_space_mm);
1571         if (unlikely(ret != 0))
1572                 return ret;
1573
1574         write_lock(&bdev->vm_lock);
1575         bo->vm_node = drm_mm_search_free(&bdev->addr_space_mm,
1576                                          bo->mem.num_pages, 0, 0);
1577
1578         if (unlikely(bo->vm_node == NULL)) {
1579                 ret = -ENOMEM;
1580                 goto out_unlock;
1581         }
1582
1583         bo->vm_node = drm_mm_get_block_atomic(bo->vm_node,
1584                                               bo->mem.num_pages, 0);
1585
1586         if (unlikely(bo->vm_node == NULL)) {
1587                 write_unlock(&bdev->vm_lock);
1588                 goto retry_pre_get;
1589         }
1590
1591         ttm_bo_vm_insert_rb(bo);
1592         write_unlock(&bdev->vm_lock);
1593         bo->addr_space_offset = ((uint64_t) bo->vm_node->start) << PAGE_SHIFT;
1594
1595         return 0;
1596 out_unlock:
1597         write_unlock(&bdev->vm_lock);
1598         return ret;
1599 }
1600
1601 int ttm_bo_wait(struct ttm_buffer_object *bo,
1602                 bool lazy, bool interruptible, bool no_wait)
1603 {
1604         struct ttm_bo_driver *driver = bo->bdev->driver;
1605         void *sync_obj;
1606         void *sync_obj_arg;
1607         int ret = 0;
1608
1609         if (likely(bo->sync_obj == NULL))
1610                 return 0;
1611
1612         while (bo->sync_obj) {
1613
1614                 if (driver->sync_obj_signaled(bo->sync_obj, bo->sync_obj_arg)) {
1615                         void *tmp_obj = bo->sync_obj;
1616                         bo->sync_obj = NULL;
1617                         clear_bit(TTM_BO_PRIV_FLAG_MOVING, &bo->priv_flags);
1618                         spin_unlock(&bo->lock);
1619                         driver->sync_obj_unref(&tmp_obj);
1620                         spin_lock(&bo->lock);
1621                         continue;
1622                 }
1623
1624                 if (no_wait)
1625                         return -EBUSY;
1626
1627                 sync_obj = driver->sync_obj_ref(bo->sync_obj);
1628                 sync_obj_arg = bo->sync_obj_arg;
1629                 spin_unlock(&bo->lock);
1630                 ret = driver->sync_obj_wait(sync_obj, sync_obj_arg,
1631                                             lazy, interruptible);
1632                 if (unlikely(ret != 0)) {
1633                         driver->sync_obj_unref(&sync_obj);
1634                         spin_lock(&bo->lock);
1635                         return ret;
1636                 }
1637                 spin_lock(&bo->lock);
1638                 if (likely(bo->sync_obj == sync_obj &&
1639                            bo->sync_obj_arg == sync_obj_arg)) {
1640                         void *tmp_obj = bo->sync_obj;
1641                         bo->sync_obj = NULL;
1642                         clear_bit(TTM_BO_PRIV_FLAG_MOVING,
1643                                   &bo->priv_flags);
1644                         spin_unlock(&bo->lock);
1645                         driver->sync_obj_unref(&sync_obj);
1646                         driver->sync_obj_unref(&tmp_obj);
1647                         spin_lock(&bo->lock);
1648                 } else {
1649                         spin_unlock(&bo->lock);
1650                         driver->sync_obj_unref(&sync_obj);
1651                         spin_lock(&bo->lock);
1652                 }
1653         }
1654         return 0;
1655 }
1656 EXPORT_SYMBOL(ttm_bo_wait);
1657
1658 void ttm_bo_unblock_reservation(struct ttm_buffer_object *bo)
1659 {
1660         atomic_set(&bo->reserved, 0);
1661         wake_up_all(&bo->event_queue);
1662 }
1663
1664 int ttm_bo_block_reservation(struct ttm_buffer_object *bo, bool interruptible,
1665                              bool no_wait)
1666 {
1667         int ret;
1668
1669         while (unlikely(atomic_cmpxchg(&bo->reserved, 0, 1) != 0)) {
1670                 if (no_wait)
1671                         return -EBUSY;
1672                 else if (interruptible) {
1673                         ret = wait_event_interruptible
1674                             (bo->event_queue, atomic_read(&bo->reserved) == 0);
1675                         if (unlikely(ret != 0))
1676                                 return -ERESTART;
1677                 } else {
1678                         wait_event(bo->event_queue,
1679                                    atomic_read(&bo->reserved) == 0);
1680                 }
1681         }
1682         return 0;
1683 }
1684
1685 int ttm_bo_synccpu_write_grab(struct ttm_buffer_object *bo, bool no_wait)
1686 {
1687         int ret = 0;
1688
1689         /*
1690          * Using ttm_bo_reserve instead of ttm_bo_block_reservation
1691          * makes sure the lru lists are updated.
1692          */
1693
1694         ret = ttm_bo_reserve(bo, true, no_wait, false, 0);
1695         if (unlikely(ret != 0))
1696                 return ret;
1697         spin_lock(&bo->lock);
1698         ret = ttm_bo_wait(bo, false, true, no_wait);
1699         spin_unlock(&bo->lock);
1700         if (likely(ret == 0))
1701                 atomic_inc(&bo->cpu_writers);
1702         ttm_bo_unreserve(bo);
1703         return ret;
1704 }
1705
1706 void ttm_bo_synccpu_write_release(struct ttm_buffer_object *bo)
1707 {
1708         if (atomic_dec_and_test(&bo->cpu_writers))
1709                 wake_up_all(&bo->event_queue);
1710 }
1711
1712 /**
1713  * A buffer object shrink method that tries to swap out the first
1714  * buffer object on the bo_global::swap_lru list.
1715  */
1716
1717 static int ttm_bo_swapout(struct ttm_mem_shrink *shrink)
1718 {
1719         struct ttm_bo_global *glob =
1720             container_of(shrink, struct ttm_bo_global, shrink);
1721         struct ttm_buffer_object *bo;
1722         int ret = -EBUSY;
1723         int put_count;
1724         uint32_t swap_placement = (TTM_PL_FLAG_CACHED | TTM_PL_FLAG_SYSTEM);
1725
1726         spin_lock(&glob->lru_lock);
1727         while (ret == -EBUSY) {
1728                 if (unlikely(list_empty(&glob->swap_lru))) {
1729                         spin_unlock(&glob->lru_lock);
1730                         return -EBUSY;
1731                 }
1732
1733                 bo = list_first_entry(&glob->swap_lru,
1734                                       struct ttm_buffer_object, swap);
1735                 kref_get(&bo->list_kref);
1736
1737                 /**
1738                  * Reserve buffer. Since we unlock while sleeping, we need
1739                  * to re-check that nobody removed us from the swap-list while
1740                  * we slept.
1741                  */
1742
1743                 ret = ttm_bo_reserve_locked(bo, false, true, false, 0);
1744                 if (unlikely(ret == -EBUSY)) {
1745                         spin_unlock(&glob->lru_lock);
1746                         ttm_bo_wait_unreserved(bo, false);
1747                         kref_put(&bo->list_kref, ttm_bo_release_list);
1748                         spin_lock(&glob->lru_lock);
1749                 }
1750         }
1751
1752         BUG_ON(ret != 0);
1753         put_count = ttm_bo_del_from_lru(bo);
1754         spin_unlock(&glob->lru_lock);
1755
1756         while (put_count--)
1757                 kref_put(&bo->list_kref, ttm_bo_ref_bug);
1758
1759         /**
1760          * Wait for GPU, then move to system cached.
1761          */
1762
1763         spin_lock(&bo->lock);
1764         ret = ttm_bo_wait(bo, false, false, false);
1765         spin_unlock(&bo->lock);
1766
1767         if (unlikely(ret != 0))
1768                 goto out;
1769
1770         if ((bo->mem.placement & swap_placement) != swap_placement) {
1771                 struct ttm_mem_reg evict_mem;
1772
1773                 evict_mem = bo->mem;
1774                 evict_mem.mm_node = NULL;
1775                 evict_mem.placement = TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED;
1776                 evict_mem.mem_type = TTM_PL_SYSTEM;
1777
1778                 ret = ttm_bo_handle_move_mem(bo, &evict_mem, true,
1779                                              false, false);
1780                 if (unlikely(ret != 0))
1781                         goto out;
1782         }
1783
1784         ttm_bo_unmap_virtual(bo);
1785
1786         /**
1787          * Swap out. Buffer will be swapped in again as soon as
1788          * anyone tries to access a ttm page.
1789          */
1790
1791         ret = ttm_tt_swapout(bo->ttm, bo->persistant_swap_storage);
1792 out:
1793
1794         /**
1795          *
1796          * Unreserve without putting on LRU to avoid swapping out an
1797          * already swapped buffer.
1798          */
1799
1800         atomic_set(&bo->reserved, 0);
1801         wake_up_all(&bo->event_queue);
1802         kref_put(&bo->list_kref, ttm_bo_release_list);
1803         return ret;
1804 }
1805
1806 void ttm_bo_swapout_all(struct ttm_bo_device *bdev)
1807 {
1808         while (ttm_bo_swapout(&bdev->glob->shrink) == 0)
1809                 ;
1810 }