drivers/gpu/drm/ttm/ttm_bo.c

   1 /**************************************************************************
   2  *
   3  * Copyright (c) 2006-2009 VMware, Inc., Palo Alto, CA., USA
   4  * All Rights Reserved.
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * copy of this software and associated documentation files (the
   8  * "Software"), to deal in the Software without restriction, including
   9  * without limitation the rights to use, copy, modify, merge, publish,
  10  * distribute, sub license, and/or sell copies of the Software, and to
  11  * permit persons to whom the Software is furnished to do so, subject to
  12  * the following conditions:
  13  *
  14  * The above copyright notice and this permission notice (including the
  15  * next paragraph) shall be included in all copies or substantial portions
  16  * of the Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  19  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  20  * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
  21  * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
  22  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
  23  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
  24  * USE OR OTHER DEALINGS IN THE SOFTWARE.
  25  *
  26  **************************************************************************/
  27 /*
  28  * Authors: Thomas Hellstrom <thellstrom-at-vmware-dot-com>
  29  */
  30
  31 #include "ttm/ttm_module.h"
  32 #include "ttm/ttm_bo_driver.h"
  33 #include "ttm/ttm_placement.h"
  34 #include <linux/jiffies.h>
  35 #include <linux/slab.h>
  36 #include <linux/sched.h>
  37 #include <linux/mm.h>
  38 #include <linux/file.h>
  39 #include <linux/module.h>
  40
  41 #define TTM_ASSERT_LOCKED(param)
  42 #define TTM_DEBUG(fmt, arg...)
  43 #define TTM_BO_HASH_ORDER 13
  44
  45 static int ttm_bo_setup_vm(struct ttm_buffer_object *bo);
  46 static void ttm_bo_unmap_virtual(struct ttm_buffer_object *bo);
  47 static int ttm_bo_swapout(struct ttm_mem_shrink *shrink);
  48
  49 static inline uint32_t ttm_bo_type_flags(unsigned type)
  50 {
  51         return 1 << (type);
  52 }
  53
  54 static void ttm_bo_release_list(struct kref *list_kref)
  55 {
  56         struct ttm_buffer_object *bo =
  57             container_of(list_kref, struct ttm_buffer_object, list_kref);
  58         struct ttm_bo_device *bdev = bo->bdev;
  59
  60         BUG_ON(atomic_read(&bo->list_kref.refcount));
  61         BUG_ON(atomic_read(&bo->kref.refcount));
  62         BUG_ON(atomic_read(&bo->cpu_writers));
  63         BUG_ON(bo->sync_obj != NULL);
  64         BUG_ON(bo->mem.mm_node != NULL);
  65         BUG_ON(!list_empty(&bo->lru));
  66         BUG_ON(!list_empty(&bo->ddestroy));
  67
  68         if (bo->ttm)
  69                 ttm_tt_destroy(bo->ttm);
  70         if (bo->destroy)
  71                 bo->destroy(bo);
  72         else {
  73                 ttm_mem_global_free(bdev->mem_glob, bo->acc_size, false);
  74                 kfree(bo);
  75         }
  76 }
  77
  78 int ttm_bo_wait_unreserved(struct ttm_buffer_object *bo, bool interruptible)
  79 {
  80
  81         if (interruptible) {
  82                 int ret = 0;
  83
  84                 ret = wait_event_interruptible(bo->event_queue,
  85                                                atomic_read(&bo->reserved) == 0);
  86                 if (unlikely(ret != 0))
  87                         return -ERESTART;
  88         } else {
  89                 wait_event(bo->event_queue, atomic_read(&bo->reserved) == 0);
  90         }
  91         return 0;
  92 }
  93
  94 static void ttm_bo_add_to_lru(struct ttm_buffer_object *bo)
  95 {
  96         struct ttm_bo_device *bdev = bo->bdev;
  97         struct ttm_mem_type_manager *man;
  98
  99         BUG_ON(!atomic_read(&bo->reserved));
 100
 101         if (!(bo->mem.placement & TTM_PL_FLAG_NO_EVICT)) {
 102
 103                 BUG_ON(!list_empty(&bo->lru));
 104
 105                 man = &bdev->man[bo->mem.mem_type];
 106                 list_add_tail(&bo->lru, &man->lru);
 107                 kref_get(&bo->list_kref);
 108
 109                 if (bo->ttm != NULL) {
 110                         list_add_tail(&bo->swap, &bdev->swap_lru);
 111                         kref_get(&bo->list_kref);
 112                 }
 113         }
 114 }
 115
 116 /**
 117  * Call with the lru_lock held.
 118  */
 119
 120 static int ttm_bo_del_from_lru(struct ttm_buffer_object *bo)
 121 {
 122         int put_count = 0;
 123
 124         if (!list_empty(&bo->swap)) {
 125                 list_del_init(&bo->swap);
 126                 ++put_count;
 127         }
 128         if (!list_empty(&bo->lru)) {
 129                 list_del_init(&bo->lru);
 130                 ++put_count;
 131         }
 132
 133         /*
 134          * TODO: Add a driver hook to delete from
 135          * driver-specific LRU's here.
 136          */
 137
 138         return put_count;
 139 }
 140
 141 int ttm_bo_reserve_locked(struct ttm_buffer_object *bo,
 142                           bool interruptible,
 143                           bool no_wait, bool use_sequence, uint32_t sequence)
 144 {
 145         struct ttm_bo_device *bdev = bo->bdev;
 146         int ret;
 147
 148         while (unlikely(atomic_cmpxchg(&bo->reserved, 0, 1) != 0)) {
 149                 if (use_sequence && bo->seq_valid &&
 150                         (sequence - bo->val_seq < (1 << 31))) {
 151                         return -EAGAIN;
 152                 }
 153
 154                 if (no_wait)
 155                         return -EBUSY;
 156
 157                 spin_unlock(&bdev->lru_lock);
 158                 ret = ttm_bo_wait_unreserved(bo, interruptible);
 159                 spin_lock(&bdev->lru_lock);
 160
 161                 if (unlikely(ret))
 162                         return ret;
 163         }
 164
 165         if (use_sequence) {
 166                 bo->val_seq = sequence;
 167                 bo->seq_valid = true;
 168         } else {
 169                 bo->seq_valid = false;
 170         }
 171
 172         return 0;
 173 }
 174 EXPORT_SYMBOL(ttm_bo_reserve);
 175
 176 static void ttm_bo_ref_bug(struct kref *list_kref)
 177 {
 178         BUG();
 179 }
 180
 181 int ttm_bo_reserve(struct ttm_buffer_object *bo,
 182                    bool interruptible,
 183                    bool no_wait, bool use_sequence, uint32_t sequence)
 184 {
 185         struct ttm_bo_device *bdev = bo->bdev;
 186         int put_count = 0;
 187         int ret;
 188
 189         spin_lock(&bdev->lru_lock);
 190         ret = ttm_bo_reserve_locked(bo, interruptible, no_wait, use_sequence,
 191                                     sequence);
 192         if (likely(ret == 0))
 193                 put_count = ttm_bo_del_from_lru(bo);
 194         spin_unlock(&bdev->lru_lock);
 195
 196         while (put_count--)
 197                 kref_put(&bo->list_kref, ttm_bo_ref_bug);
 198
 199         return ret;
 200 }
 201
 202 void ttm_bo_unreserve(struct ttm_buffer_object *bo)
 203 {
 204         struct ttm_bo_device *bdev = bo->bdev;
 205
 206         spin_lock(&bdev->lru_lock);
 207         ttm_bo_add_to_lru(bo);
 208         atomic_set(&bo->reserved, 0);
 209         wake_up_all(&bo->event_queue);
 210         spin_unlock(&bdev->lru_lock);
 211 }
 212 EXPORT_SYMBOL(ttm_bo_unreserve);
 213
 214 /*
 215  * Call bo->mutex locked.
 216  */
 217
 218 static int ttm_bo_add_ttm(struct ttm_buffer_object *bo, bool zero_alloc)
 219 {
 220         struct ttm_bo_device *bdev = bo->bdev;
 221         int ret = 0;
 222         uint32_t page_flags = 0;
 223
 224         TTM_ASSERT_LOCKED(&bo->mutex);
 225         bo->ttm = NULL;
 226
 227         switch (bo->type) {
 228         case ttm_bo_type_device:
 229                 if (zero_alloc)
 230                         page_flags |= TTM_PAGE_FLAG_ZERO_ALLOC;
 231         case ttm_bo_type_kernel:
 232                 bo->ttm = ttm_tt_create(bdev, bo->num_pages << PAGE_SHIFT,
 233                                         page_flags, bdev->dummy_read_page);
 234                 if (unlikely(bo->ttm == NULL))
 235                         ret = -ENOMEM;
 236                 break;
 237         case ttm_bo_type_user:
 238                 bo->ttm = ttm_tt_create(bdev, bo->num_pages << PAGE_SHIFT,
 239                                         page_flags | TTM_PAGE_FLAG_USER,
 240                                         bdev->dummy_read_page);
 241                 if (unlikely(bo->ttm == NULL))
 242                         ret = -ENOMEM;
 243                 break;
 244
 245                 ret = ttm_tt_set_user(bo->ttm, current,
 246                                       bo->buffer_start, bo->num_pages);
 247                 if (unlikely(ret != 0))
 248                         ttm_tt_destroy(bo->ttm);
 249                 break;
 250         default:
 251                 printk(KERN_ERR TTM_PFX "Illegal buffer object type\n");
 252                 ret = -EINVAL;
 253                 break;
 254         }
 255
 256         return ret;
 257 }
 258
 259 static int ttm_bo_handle_move_mem(struct ttm_buffer_object *bo,
 260                                   struct ttm_mem_reg *mem,
 261                                   bool evict, bool interruptible, bool no_wait)
 262 {
 263         struct ttm_bo_device *bdev = bo->bdev;
 264         bool old_is_pci = ttm_mem_reg_is_pci(bdev, &bo->mem);
 265         bool new_is_pci = ttm_mem_reg_is_pci(bdev, mem);
 266         struct ttm_mem_type_manager *old_man = &bdev->man[bo->mem.mem_type];
 267         struct ttm_mem_type_manager *new_man = &bdev->man[mem->mem_type];
 268         int ret = 0;
 269
 270         if (old_is_pci || new_is_pci ||
 271             ((mem->placement & bo->mem.placement & TTM_PL_MASK_CACHING) == 0))
 272                 ttm_bo_unmap_virtual(bo);
 273
 274         /*
 275          * Create and bind a ttm if required.
 276          */
 277
 278         if (!(new_man->flags & TTM_MEMTYPE_FLAG_FIXED) && (bo->ttm == NULL)) {
 279                 ret = ttm_bo_add_ttm(bo, false);
 280                 if (ret)
 281                         goto out_err;
 282
 283                 ret = ttm_tt_set_placement_caching(bo->ttm, mem->placement);
 284                 if (ret)
 285                         return ret;
 286
 287                 if (mem->mem_type != TTM_PL_SYSTEM) {
 288                         ret = ttm_tt_bind(bo->ttm, mem);
 289                         if (ret)
 290                                 goto out_err;
 291                 }
 292
 293                 if (bo->mem.mem_type == TTM_PL_SYSTEM) {
 294
 295                         struct ttm_mem_reg *old_mem = &bo->mem;
 296                         uint32_t save_flags = old_mem->placement;
 297
 298                         *old_mem = *mem;
 299                         mem->mm_node = NULL;
 300                         ttm_flag_masked(&save_flags, mem->placement,
 301                                         TTM_PL_MASK_MEMTYPE);
 302                         goto moved;
 303                 }
 304
 305         }
 306
 307         if (!(old_man->flags & TTM_MEMTYPE_FLAG_FIXED) &&
 308             !(new_man->flags & TTM_MEMTYPE_FLAG_FIXED))
 309                 ret = ttm_bo_move_ttm(bo, evict, no_wait, mem);
 310         else if (bdev->driver->move)
 311                 ret = bdev->driver->move(bo, evict, interruptible,
 312                                          no_wait, mem);
 313         else
 314                 ret = ttm_bo_move_memcpy(bo, evict, no_wait, mem);
 315
 316         if (ret)
 317                 goto out_err;
 318
 319 moved:
 320         if (bo->evicted) {
 321                 ret = bdev->driver->invalidate_caches(bdev, bo->mem.placement);
 322                 if (ret)
 323                         printk(KERN_ERR TTM_PFX "Can not flush read caches\n");
 324                 bo->evicted = false;
 325         }
 326
 327         if (bo->mem.mm_node) {
 328                 spin_lock(&bo->lock);
 329                 bo->offset = (bo->mem.mm_node->start << PAGE_SHIFT) +
 330                     bdev->man[bo->mem.mem_type].gpu_offset;
 331                 bo->cur_placement = bo->mem.placement;
 332                 spin_unlock(&bo->lock);
 333         }
 334
 335         return 0;
 336
 337 out_err:
 338         new_man = &bdev->man[bo->mem.mem_type];
 339         if ((new_man->flags & TTM_MEMTYPE_FLAG_FIXED) && bo->ttm) {
 340                 ttm_tt_unbind(bo->ttm);
 341                 ttm_tt_destroy(bo->ttm);
 342                 bo->ttm = NULL;
 343         }
 344
 345         return ret;
 346 }
 347
 348 /**
 349  * If bo idle, remove from delayed- and lru lists, and unref.
 350  * If not idle, and already on delayed list, do nothing.
 351  * If not idle, and not on delayed list, put on delayed list,
 352  *   up the list_kref and schedule a delayed list check.
 353  */
 354
 355 static int ttm_bo_cleanup_refs(struct ttm_buffer_object *bo, bool remove_all)
 356 {
 357         struct ttm_bo_device *bdev = bo->bdev;
 358         struct ttm_bo_driver *driver = bdev->driver;
 359         int ret;
 360
 361         spin_lock(&bo->lock);
 362         (void) ttm_bo_wait(bo, false, false, !remove_all);
 363
 364         if (!bo->sync_obj) {
 365                 int put_count;
 366
 367                 spin_unlock(&bo->lock);
 368
 369                 spin_lock(&bdev->lru_lock);
 370                 ret = ttm_bo_reserve_locked(bo, false, false, false, 0);
 371                 BUG_ON(ret);
 372                 if (bo->ttm)
 373                         ttm_tt_unbind(bo->ttm);
 374
 375                 if (!list_empty(&bo->ddestroy)) {
 376                         list_del_init(&bo->ddestroy);
 377                         kref_put(&bo->list_kref, ttm_bo_ref_bug);
 378                 }
 379                 if (bo->mem.mm_node) {
 380                         drm_mm_put_block(bo->mem.mm_node);
 381                         bo->mem.mm_node = NULL;
 382                 }
 383                 put_count = ttm_bo_del_from_lru(bo);
 384                 spin_unlock(&bdev->lru_lock);
 385
 386                 atomic_set(&bo->reserved, 0);
 387
 388                 while (put_count--)
 389                         kref_put(&bo->list_kref, ttm_bo_release_list);
 390
 391                 return 0;
 392         }
 393
 394         spin_lock(&bdev->lru_lock);
 395         if (list_empty(&bo->ddestroy)) {
 396                 void *sync_obj = bo->sync_obj;
 397                 void *sync_obj_arg = bo->sync_obj_arg;
 398
 399                 kref_get(&bo->list_kref);
 400                 list_add_tail(&bo->ddestroy, &bdev->ddestroy);
 401                 spin_unlock(&bdev->lru_lock);
 402                 spin_unlock(&bo->lock);
 403
 404                 if (sync_obj)
 405                         driver->sync_obj_flush(sync_obj, sync_obj_arg);
 406                 schedule_delayed_work(&bdev->wq,
 407                                       ((HZ / 100) < 1) ? 1 : HZ / 100);
 408                 ret = 0;
 409
 410         } else {
 411                 spin_unlock(&bdev->lru_lock);
 412                 spin_unlock(&bo->lock);
 413                 ret = -EBUSY;
 414         }
 415
 416         return ret;
 417 }
 418
 419 /**
 420  * Traverse the delayed list, and call ttm_bo_cleanup_refs on all
 421  * encountered buffers.
 422  */
 423
 424 static int ttm_bo_delayed_delete(struct ttm_bo_device *bdev, bool remove_all)
 425 {
 426         struct ttm_buffer_object *entry, *nentry;
 427         struct list_head *list, *next;
 428         int ret;
 429
 430         spin_lock(&bdev->lru_lock);
 431         list_for_each_safe(list, next, &bdev->ddestroy) {
 432                 entry = list_entry(list, struct ttm_buffer_object, ddestroy);
 433                 nentry = NULL;
 434
 435                 /*
 436                  * Protect the next list entry from destruction while we
 437                  * unlock the lru_lock.
 438                  */
 439
 440                 if (next != &bdev->ddestroy) {
 441                         nentry = list_entry(next, struct ttm_buffer_object,
 442                                             ddestroy);
 443                         kref_get(&nentry->list_kref);
 444                 }
 445                 kref_get(&entry->list_kref);
 446
 447                 spin_unlock(&bdev->lru_lock);
 448                 ret = ttm_bo_cleanup_refs(entry, remove_all);
 449                 kref_put(&entry->list_kref, ttm_bo_release_list);
 450
 451                 spin_lock(&bdev->lru_lock);
 452                 if (nentry) {
 453                         bool next_onlist = !list_empty(next);
 454                         spin_unlock(&bdev->lru_lock);
 455                         kref_put(&nentry->list_kref, ttm_bo_release_list);
 456                         spin_lock(&bdev->lru_lock);
 457                         /*
 458                          * Someone might have raced us and removed the
 459                          * next entry from the list. We don't bother restarting
 460                          * list traversal.
 461                          */
 462
 463                         if (!next_onlist)
 464                                 break;
 465                 }
 466                 if (ret)
 467                         break;
 468         }
 469         ret = !list_empty(&bdev->ddestroy);
 470         spin_unlock(&bdev->lru_lock);
 471
 472         return ret;
 473 }
 474
 475 static void ttm_bo_delayed_workqueue(struct work_struct *work)
 476 {
 477         struct ttm_bo_device *bdev =
 478             container_of(work, struct ttm_bo_device, wq.work);
 479
 480         if (ttm_bo_delayed_delete(bdev, false)) {
 481                 schedule_delayed_work(&bdev->wq,
 482                                       ((HZ / 100) < 1) ? 1 : HZ / 100);
 483         }
 484 }
 485
 486 static void ttm_bo_release(struct kref *kref)
 487 {
 488         struct ttm_buffer_object *bo =
 489             container_of(kref, struct ttm_buffer_object, kref);
 490         struct ttm_bo_device *bdev = bo->bdev;
 491
 492         if (likely(bo->vm_node != NULL)) {
 493                 rb_erase(&bo->vm_rb, &bdev->addr_space_rb);
 494                 drm_mm_put_block(bo->vm_node);
 495                 bo->vm_node = NULL;
 496         }
 497         write_unlock(&bdev->vm_lock);
 498         ttm_bo_cleanup_refs(bo, false);
 499         kref_put(&bo->list_kref, ttm_bo_release_list);
 500         write_lock(&bdev->vm_lock);
 501 }
 502
 503 void ttm_bo_unref(struct ttm_buffer_object **p_bo)
 504 {
 505         struct ttm_buffer_object *bo = *p_bo;
 506         struct ttm_bo_device *bdev = bo->bdev;
 507
 508         *p_bo = NULL;
 509         write_lock(&bdev->vm_lock);
 510         kref_put(&bo->kref, ttm_bo_release);
 511         write_unlock(&bdev->vm_lock);
 512 }
 513 EXPORT_SYMBOL(ttm_bo_unref);
 514
 515 static int ttm_bo_evict(struct ttm_buffer_object *bo, unsigned mem_type,
 516                         bool interruptible, bool no_wait)
 517 {
 518         int ret = 0;
 519         struct ttm_bo_device *bdev = bo->bdev;
 520         struct ttm_mem_reg evict_mem;
 521         uint32_t proposed_placement;
 522
 523         if (bo->mem.mem_type != mem_type)
 524                 goto out;
 525
 526         spin_lock(&bo->lock);
 527         ret = ttm_bo_wait(bo, false, interruptible, no_wait);
 528         spin_unlock(&bo->lock);
 529
 530         if (ret && ret != -ERESTART) {
 531                 printk(KERN_ERR TTM_PFX "Failed to expire sync object before "
 532                        "buffer eviction.\n");
 533                 goto out;
 534         }
 535
 536         BUG_ON(!atomic_read(&bo->reserved));
 537
 538         evict_mem = bo->mem;
 539         evict_mem.mm_node = NULL;
 540
 541         proposed_placement = bdev->driver->evict_flags(bo);
 542
 543         ret = ttm_bo_mem_space(bo, proposed_placement,
 544                                &evict_mem, interruptible, no_wait);
 545         if (unlikely(ret != 0 && ret != -ERESTART))
 546                 ret = ttm_bo_mem_space(bo, TTM_PL_FLAG_SYSTEM,
 547                                        &evict_mem, interruptible, no_wait);
 548
 549         if (ret) {
 550                 if (ret != -ERESTART)
 551                         printk(KERN_ERR TTM_PFX
 552                                "Failed to find memory space for "
 553                                "buffer 0x%p eviction.\n", bo);
 554                 goto out;
 555         }
 556
 557         ret = ttm_bo_handle_move_mem(bo, &evict_mem, true, interruptible,
 558                                      no_wait);
 559         if (ret) {
 560                 if (ret != -ERESTART)
 561                         printk(KERN_ERR TTM_PFX "Buffer eviction failed\n");
 562                 goto out;
 563         }
 564
 565         spin_lock(&bdev->lru_lock);
 566         if (evict_mem.mm_node) {
 567                 drm_mm_put_block(evict_mem.mm_node);
 568                 evict_mem.mm_node = NULL;
 569         }
 570         spin_unlock(&bdev->lru_lock);
 571         bo->evicted = true;
 572 out:
 573         return ret;
 574 }
 575
 576 /**
 577  * Repeatedly evict memory from the LRU for @mem_type until we create enough
 578  * space, or we've evicted everything and there isn't enough space.
 579  */
 580 static int ttm_bo_mem_force_space(struct ttm_bo_device *bdev,
 581                                   struct ttm_mem_reg *mem,
 582                                   uint32_t mem_type,
 583                                   bool interruptible, bool no_wait)
 584 {
 585         struct drm_mm_node *node;
 586         struct ttm_buffer_object *entry;
 587         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
 588         struct list_head *lru;
 589         unsigned long num_pages = mem->num_pages;
 590         int put_count = 0;
 591         int ret;
 592
 593 retry_pre_get:
 594         ret = drm_mm_pre_get(&man->manager);
 595         if (unlikely(ret != 0))
 596                 return ret;
 597
 598         spin_lock(&bdev->lru_lock);
 599         do {
 600                 node = drm_mm_search_free(&man->manager, num_pages,
 601                                           mem->page_alignment, 1);
 602                 if (node)
 603                         break;
 604
 605                 lru = &man->lru;
 606                 if (list_empty(lru))
 607                         break;
 608
 609                 entry = list_first_entry(lru, struct ttm_buffer_object, lru);
 610                 kref_get(&entry->list_kref);
 611
 612                 ret =
 613                     ttm_bo_reserve_locked(entry, interruptible, no_wait,
 614                                           false, 0);
 615
 616                 if (likely(ret == 0))
 617                         put_count = ttm_bo_del_from_lru(entry);
 618
 619                 spin_unlock(&bdev->lru_lock);
 620
 621                 if (unlikely(ret != 0))
 622                         return ret;
 623
 624                 while (put_count--)
 625                         kref_put(&entry->list_kref, ttm_bo_ref_bug);
 626
 627                 ret = ttm_bo_evict(entry, mem_type, interruptible, no_wait);
 628
 629                 ttm_bo_unreserve(entry);
 630
 631                 kref_put(&entry->list_kref, ttm_bo_release_list);
 632                 if (ret)
 633                         return ret;
 634
 635                 spin_lock(&bdev->lru_lock);
 636         } while (1);
 637
 638         if (!node) {
 639                 spin_unlock(&bdev->lru_lock);
 640                 return -ENOMEM;
 641         }
 642
 643         node = drm_mm_get_block_atomic(node, num_pages, mem->page_alignment);
 644         if (unlikely(!node)) {
 645                 spin_unlock(&bdev->lru_lock);
 646                 goto retry_pre_get;
 647         }
 648
 649         spin_unlock(&bdev->lru_lock);
 650         mem->mm_node = node;
 651         mem->mem_type = mem_type;
 652         return 0;
 653 }
 654
 655 static bool ttm_bo_mt_compatible(struct ttm_mem_type_manager *man,
 656                                  bool disallow_fixed,
 657                                  uint32_t mem_type,
 658                                  uint32_t mask, uint32_t *res_mask)
 659 {
 660         uint32_t cur_flags = ttm_bo_type_flags(mem_type);
 661
 662         if ((man->flags & TTM_MEMTYPE_FLAG_FIXED) && disallow_fixed)
 663                 return false;
 664
 665         if ((cur_flags & mask & TTM_PL_MASK_MEM) == 0)
 666                 return false;
 667
 668         if ((mask & man->available_caching) == 0)
 669                 return false;
 670         if (mask & man->default_caching)
 671                 cur_flags |= man->default_caching;
 672         else if (mask & TTM_PL_FLAG_CACHED)
 673                 cur_flags |= TTM_PL_FLAG_CACHED;
 674         else if (mask & TTM_PL_FLAG_WC)
 675                 cur_flags |= TTM_PL_FLAG_WC;
 676         else
 677                 cur_flags |= TTM_PL_FLAG_UNCACHED;
 678
 679         *res_mask = cur_flags;
 680         return true;
 681 }
 682
 683 /**
 684  * Creates space for memory region @mem according to its type.
 685  *
 686  * This function first searches for free space in compatible memory types in
 687  * the priority order defined by the driver.  If free space isn't found, then
 688  * ttm_bo_mem_force_space is attempted in priority order to evict and find
 689  * space.
 690  */
 691 int ttm_bo_mem_space(struct ttm_buffer_object *bo,
 692                      uint32_t proposed_placement,
 693                      struct ttm_mem_reg *mem,
 694                      bool interruptible, bool no_wait)
 695 {
 696         struct ttm_bo_device *bdev = bo->bdev;
 697         struct ttm_mem_type_manager *man;
 698
 699         uint32_t num_prios = bdev->driver->num_mem_type_prio;
 700         const uint32_t *prios = bdev->driver->mem_type_prio;
 701         uint32_t i;
 702         uint32_t mem_type = TTM_PL_SYSTEM;
 703         uint32_t cur_flags = 0;
 704         bool type_found = false;
 705         bool type_ok = false;
 706         bool has_eagain = false;
 707         struct drm_mm_node *node = NULL;
 708         int ret;
 709
 710         mem->mm_node = NULL;
 711         for (i = 0; i < num_prios; ++i) {
 712                 mem_type = prios[i];
 713                 man = &bdev->man[mem_type];
 714
 715                 type_ok = ttm_bo_mt_compatible(man,
 716                                                bo->type == ttm_bo_type_user,
 717                                                mem_type, proposed_placement,
 718                                                &cur_flags);
 719
 720                 if (!type_ok)
 721                         continue;
 722
 723                 if (mem_type == TTM_PL_SYSTEM)
 724                         break;
 725
 726                 if (man->has_type && man->use_type) {
 727                         type_found = true;
 728                         do {
 729                                 ret = drm_mm_pre_get(&man->manager);
 730                                 if (unlikely(ret))
 731                                         return ret;
 732
 733                                 spin_lock(&bdev->lru_lock);
 734                                 node = drm_mm_search_free(&man->manager,
 735                                                           mem->num_pages,
 736                                                           mem->page_alignment,
 737                                                           1);
 738                                 if (unlikely(!node)) {
 739                                         spin_unlock(&bdev->lru_lock);
 740                                         break;
 741                                 }
 742                                 node = drm_mm_get_block_atomic(node,
 743                                                                mem->num_pages,
 744                                                                mem->
 745                                                                page_alignment);
 746                                 spin_unlock(&bdev->lru_lock);
 747                         } while (!node);
 748                 }
 749                 if (node)
 750                         break;
 751         }
 752
 753         if ((type_ok && (mem_type == TTM_PL_SYSTEM)) || node) {
 754                 mem->mm_node = node;
 755                 mem->mem_type = mem_type;
 756                 mem->placement = cur_flags;
 757                 return 0;
 758         }
 759
 760         if (!type_found)
 761                 return -EINVAL;
 762
 763         num_prios = bdev->driver->num_mem_busy_prio;
 764         prios = bdev->driver->mem_busy_prio;
 765
 766         for (i = 0; i < num_prios; ++i) {
 767                 mem_type = prios[i];
 768                 man = &bdev->man[mem_type];
 769
 770                 if (!man->has_type)
 771                         continue;
 772
 773                 if (!ttm_bo_mt_compatible(man,
 774                                           bo->type == ttm_bo_type_user,
 775                                           mem_type,
 776                                           proposed_placement, &cur_flags))
 777                         continue;
 778
 779                 ret = ttm_bo_mem_force_space(bdev, mem, mem_type,
 780                                              interruptible, no_wait);
 781
 782                 if (ret == 0 && mem->mm_node) {
 783                         mem->placement = cur_flags;
 784                         return 0;
 785                 }
 786
 787                 if (ret == -ERESTART)
 788                         has_eagain = true;
 789         }
 790
 791         ret = (has_eagain) ? -ERESTART : -ENOMEM;
 792         return ret;
 793 }
 794 EXPORT_SYMBOL(ttm_bo_mem_space);
 795
 796 int ttm_bo_wait_cpu(struct ttm_buffer_object *bo, bool no_wait)
 797 {
 798         int ret = 0;
 799
 800         if ((atomic_read(&bo->cpu_writers) > 0) && no_wait)
 801                 return -EBUSY;
 802
 803         ret = wait_event_interruptible(bo->event_queue,
 804                                        atomic_read(&bo->cpu_writers) == 0);
 805
 806         if (ret == -ERESTARTSYS)
 807                 ret = -ERESTART;
 808
 809         return ret;
 810 }
 811
 812 int ttm_bo_move_buffer(struct ttm_buffer_object *bo,
 813                        uint32_t proposed_placement,
 814                        bool interruptible, bool no_wait)
 815 {
 816         struct ttm_bo_device *bdev = bo->bdev;
 817         int ret = 0;
 818         struct ttm_mem_reg mem;
 819
 820         BUG_ON(!atomic_read(&bo->reserved));
 821
 822         /*
 823          * FIXME: It's possible to pipeline buffer moves.
 824          * Have the driver move function wait for idle when necessary,
 825          * instead of doing it here.
 826          */
 827
 828         spin_lock(&bo->lock);
 829         ret = ttm_bo_wait(bo, false, interruptible, no_wait);
 830         spin_unlock(&bo->lock);
 831
 832         if (ret)
 833                 return ret;
 834
 835         mem.num_pages = bo->num_pages;
 836         mem.size = mem.num_pages << PAGE_SHIFT;
 837         mem.page_alignment = bo->mem.page_alignment;
 838
 839         /*
 840          * Determine where to move the buffer.
 841          */
 842
 843         ret = ttm_bo_mem_space(bo, proposed_placement, &mem,
 844                                interruptible, no_wait);
 845         if (ret)
 846                 goto out_unlock;
 847
 848         ret = ttm_bo_handle_move_mem(bo, &mem, false, interruptible, no_wait);
 849
 850 out_unlock:
 851         if (ret && mem.mm_node) {
 852                 spin_lock(&bdev->lru_lock);
 853                 drm_mm_put_block(mem.mm_node);
 854                 spin_unlock(&bdev->lru_lock);
 855         }
 856         return ret;
 857 }
 858
 859 static int ttm_bo_mem_compat(uint32_t proposed_placement,
 860                              struct ttm_mem_reg *mem)
 861 {
 862         if ((proposed_placement & mem->placement & TTM_PL_MASK_MEM) == 0)
 863                 return 0;
 864         if ((proposed_placement & mem->placement & TTM_PL_MASK_CACHING) == 0)
 865                 return 0;
 866
 867         return 1;
 868 }
 869
 870 int ttm_buffer_object_validate(struct ttm_buffer_object *bo,
 871                                uint32_t proposed_placement,
 872                                bool interruptible, bool no_wait)
 873 {
 874         int ret;
 875
 876         BUG_ON(!atomic_read(&bo->reserved));
 877         bo->proposed_placement = proposed_placement;
 878
 879         TTM_DEBUG("Proposed placement 0x%08lx, Old flags 0x%08lx\n",
 880                   (unsigned long)proposed_placement,
 881                   (unsigned long)bo->mem.placement);
 882
 883         /*
 884          * Check whether we need to move buffer.
 885          */
 886
 887         if (!ttm_bo_mem_compat(bo->proposed_placement, &bo->mem)) {
 888                 ret = ttm_bo_move_buffer(bo, bo->proposed_placement,
 889                                          interruptible, no_wait);
 890                 if (ret) {
 891                         if (ret != -ERESTART)
 892                                 printk(KERN_ERR TTM_PFX
 893                                        "Failed moving buffer. "
 894                                        "Proposed placement 0x%08x\n",
 895                                        bo->proposed_placement);
 896                         if (ret == -ENOMEM)
 897                                 printk(KERN_ERR TTM_PFX
 898                                        "Out of aperture space or "
 899                                        "DRM memory quota.\n");
 900                         return ret;
 901                 }
 902         }
 903
 904         /*
 905          * We might need to add a TTM.
 906          */
 907
 908         if (bo->mem.mem_type == TTM_PL_SYSTEM && bo->ttm == NULL) {
 909                 ret = ttm_bo_add_ttm(bo, true);
 910                 if (ret)
 911                         return ret;
 912         }
 913         /*
 914          * Validation has succeeded, move the access and other
 915          * non-mapping-related flag bits from the proposed flags to
 916          * the active flags
 917          */
 918
 919         ttm_flag_masked(&bo->mem.placement, bo->proposed_placement,
 920                         ~TTM_PL_MASK_MEMTYPE);
 921
 922         return 0;
 923 }
 924 EXPORT_SYMBOL(ttm_buffer_object_validate);
 925
 926 int
 927 ttm_bo_check_placement(struct ttm_buffer_object *bo,
 928                        uint32_t set_flags, uint32_t clr_flags)
 929 {
 930         uint32_t new_mask = set_flags | clr_flags;
 931
 932         if ((bo->type == ttm_bo_type_user) &&
 933             (clr_flags & TTM_PL_FLAG_CACHED)) {
 934                 printk(KERN_ERR TTM_PFX
 935                        "User buffers require cache-coherent memory.\n");
 936                 return -EINVAL;
 937         }
 938
 939         if (!capable(CAP_SYS_ADMIN)) {
 940                 if (new_mask & TTM_PL_FLAG_NO_EVICT) {
 941                         printk(KERN_ERR TTM_PFX "Need to be root to modify"
 942                                " NO_EVICT status.\n");
 943                         return -EINVAL;
 944                 }
 945
 946                 if ((clr_flags & bo->mem.placement & TTM_PL_MASK_MEMTYPE) &&
 947                     (bo->mem.placement & TTM_PL_FLAG_NO_EVICT)) {
 948                         printk(KERN_ERR TTM_PFX
 949                                "Incompatible memory specification"
 950                                " for NO_EVICT buffer.\n");
 951                         return -EINVAL;
 952                 }
 953         }
 954         return 0;
 955 }
 956
 957 int ttm_buffer_object_init(struct ttm_bo_device *bdev,
 958                            struct ttm_buffer_object *bo,
 959                            unsigned long size,
 960                            enum ttm_bo_type type,
 961                            uint32_t flags,
 962                            uint32_t page_alignment,
 963                            unsigned long buffer_start,
 964                            bool interruptible,
 965                            struct file *persistant_swap_storage,
 966                            size_t acc_size,
 967                            void (*destroy) (struct ttm_buffer_object *))
 968 {
 969         int ret = 0;
 970         unsigned long num_pages;
 971
 972         size += buffer_start & ~PAGE_MASK;
 973         num_pages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
 974         if (num_pages == 0) {
 975                 printk(KERN_ERR TTM_PFX "Illegal buffer object size.\n");
 976                 return -EINVAL;
 977         }
 978         bo->destroy = destroy;
 979
 980         spin_lock_init(&bo->lock);
 981         kref_init(&bo->kref);
 982         kref_init(&bo->list_kref);
 983         atomic_set(&bo->cpu_writers, 0);
 984         atomic_set(&bo->reserved, 1);
 985         init_waitqueue_head(&bo->event_queue);
 986         INIT_LIST_HEAD(&bo->lru);
 987         INIT_LIST_HEAD(&bo->ddestroy);
 988         INIT_LIST_HEAD(&bo->swap);
 989         bo->bdev = bdev;
 990         bo->type = type;
 991         bo->num_pages = num_pages;
 992         bo->mem.mem_type = TTM_PL_SYSTEM;
 993         bo->mem.num_pages = bo->num_pages;
 994         bo->mem.mm_node = NULL;
 995         bo->mem.page_alignment = page_alignment;
 996         bo->buffer_start = buffer_start & PAGE_MASK;
 997         bo->priv_flags = 0;
 998         bo->mem.placement = (TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED);
 999         bo->seq_valid = false;
1000         bo->persistant_swap_storage = persistant_swap_storage;
1001         bo->acc_size = acc_size;
1002
1003         ret = ttm_bo_check_placement(bo, flags, 0ULL);
1004         if (unlikely(ret != 0))
1005                 goto out_err;
1006
1007         /*
1008          * If no caching attributes are set, accept any form of caching.
1009          */
1010
1011         if ((flags & TTM_PL_MASK_CACHING) == 0)
1012                 flags |= TTM_PL_MASK_CACHING;
1013
1014         /*
1015          * For ttm_bo_type_device buffers, allocate
1016          * address space from the device.
1017          */
1018
1019         if (bo->type == ttm_bo_type_device) {
1020                 ret = ttm_bo_setup_vm(bo);
1021                 if (ret)
1022                         goto out_err;
1023         }
1024
1025         ret = ttm_buffer_object_validate(bo, flags, interruptible, false);
1026         if (ret)
1027                 goto out_err;
1028
1029         ttm_bo_unreserve(bo);
1030         return 0;
1031
1032 out_err:
1033         ttm_bo_unreserve(bo);
1034         ttm_bo_unref(&bo);
1035
1036         return ret;
1037 }
1038 EXPORT_SYMBOL(ttm_buffer_object_init);
1039
1040 static inline size_t ttm_bo_size(struct ttm_bo_device *bdev,
1041                                  unsigned long num_pages)
1042 {
1043         size_t page_array_size = (num_pages * sizeof(void *) + PAGE_SIZE - 1) &
1044             PAGE_MASK;
1045
1046         return bdev->ttm_bo_size + 2 * page_array_size;
1047 }
1048
1049 int ttm_buffer_object_create(struct ttm_bo_device *bdev,
1050                              unsigned long size,
1051                              enum ttm_bo_type type,
1052                              uint32_t flags,
1053                              uint32_t page_alignment,
1054                              unsigned long buffer_start,
1055                              bool interruptible,
1056                              struct file *persistant_swap_storage,
1057                              struct ttm_buffer_object **p_bo)
1058 {
1059         struct ttm_buffer_object *bo;
1060         int ret;
1061         struct ttm_mem_global *mem_glob = bdev->mem_glob;
1062
1063         size_t acc_size =
1064             ttm_bo_size(bdev, (size + PAGE_SIZE - 1) >> PAGE_SHIFT);
1065         ret = ttm_mem_global_alloc(mem_glob, acc_size, false, false, false);
1066         if (unlikely(ret != 0))
1067                 return ret;
1068
1069         bo = kzalloc(sizeof(*bo), GFP_KERNEL);
1070
1071         if (unlikely(bo == NULL)) {
1072                 ttm_mem_global_free(mem_glob, acc_size, false);
1073                 return -ENOMEM;
1074         }
1075
1076         ret = ttm_buffer_object_init(bdev, bo, size, type, flags,
1077                                      page_alignment, buffer_start,
1078                                      interruptible,
1079                                      persistant_swap_storage, acc_size, NULL);
1080         if (likely(ret == 0))
1081                 *p_bo = bo;
1082
1083         return ret;
1084 }
1085
1086 static int ttm_bo_leave_list(struct ttm_buffer_object *bo,
1087                              uint32_t mem_type, bool allow_errors)
1088 {
1089         int ret;
1090
1091         spin_lock(&bo->lock);
1092         ret = ttm_bo_wait(bo, false, false, false);
1093         spin_unlock(&bo->lock);
1094
1095         if (ret && allow_errors)
1096                 goto out;
1097
1098         if (bo->mem.mem_type == mem_type)
1099                 ret = ttm_bo_evict(bo, mem_type, false, false);
1100
1101         if (ret) {
1102                 if (allow_errors) {
1103                         goto out;
1104                 } else {
1105                         ret = 0;
1106                         printk(KERN_ERR TTM_PFX "Cleanup eviction failed\n");
1107                 }
1108         }
1109
1110 out:
1111         return ret;
1112 }
1113
1114 static int ttm_bo_force_list_clean(struct ttm_bo_device *bdev,
1115                                    struct list_head *head,
1116                                    unsigned mem_type, bool allow_errors)
1117 {
1118         struct ttm_buffer_object *entry;
1119         int ret;
1120         int put_count;
1121
1122         /*
1123          * Can't use standard list traversal since we're unlocking.
1124          */
1125
1126         spin_lock(&bdev->lru_lock);
1127
1128         while (!list_empty(head)) {
1129                 entry = list_first_entry(head, struct ttm_buffer_object, lru);
1130                 kref_get(&entry->list_kref);
1131                 ret = ttm_bo_reserve_locked(entry, false, false, false, 0);
1132                 put_count = ttm_bo_del_from_lru(entry);
1133                 spin_unlock(&bdev->lru_lock);
1134                 while (put_count--)
1135                         kref_put(&entry->list_kref, ttm_bo_ref_bug);
1136                 BUG_ON(ret);
1137                 ret = ttm_bo_leave_list(entry, mem_type, allow_errors);
1138                 ttm_bo_unreserve(entry);
1139                 kref_put(&entry->list_kref, ttm_bo_release_list);
1140                 spin_lock(&bdev->lru_lock);
1141         }
1142
1143         spin_unlock(&bdev->lru_lock);
1144
1145         return 0;
1146 }
1147
1148 int ttm_bo_clean_mm(struct ttm_bo_device *bdev, unsigned mem_type)
1149 {
1150         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
1151         int ret = -EINVAL;
1152
1153         if (mem_type >= TTM_NUM_MEM_TYPES) {
1154                 printk(KERN_ERR TTM_PFX "Illegal memory type %d\n", mem_type);
1155                 return ret;
1156         }
1157
1158         if (!man->has_type) {
1159                 printk(KERN_ERR TTM_PFX "Trying to take down uninitialized "
1160                        "memory manager type %u\n", mem_type);
1161                 return ret;
1162         }
1163
1164         man->use_type = false;
1165         man->has_type = false;
1166
1167         ret = 0;
1168         if (mem_type > 0) {
1169                 ttm_bo_force_list_clean(bdev, &man->lru, mem_type, false);
1170
1171                 spin_lock(&bdev->lru_lock);
1172                 if (drm_mm_clean(&man->manager))
1173                         drm_mm_takedown(&man->manager);
1174                 else
1175                         ret = -EBUSY;
1176
1177                 spin_unlock(&bdev->lru_lock);
1178         }
1179
1180         return ret;
1181 }
1182 EXPORT_SYMBOL(ttm_bo_clean_mm);
1183
1184 int ttm_bo_evict_mm(struct ttm_bo_device *bdev, unsigned mem_type)
1185 {
1186         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
1187
1188         if (mem_type == 0 || mem_type >= TTM_NUM_MEM_TYPES) {
1189                 printk(KERN_ERR TTM_PFX
1190                        "Illegal memory manager memory type %u.\n",
1191                        mem_type);
1192                 return -EINVAL;
1193         }
1194
1195         if (!man->has_type) {
1196                 printk(KERN_ERR TTM_PFX
1197                        "Memory type %u has not been initialized.\n",
1198                        mem_type);
1199                 return 0;
1200         }
1201
1202         return ttm_bo_force_list_clean(bdev, &man->lru, mem_type, true);
1203 }
1204 EXPORT_SYMBOL(ttm_bo_evict_mm);
1205
1206 int ttm_bo_init_mm(struct ttm_bo_device *bdev, unsigned type,
1207                    unsigned long p_offset, unsigned long p_size)
1208 {
1209         int ret = -EINVAL;
1210         struct ttm_mem_type_manager *man;
1211
1212         if (type >= TTM_NUM_MEM_TYPES) {
1213                 printk(KERN_ERR TTM_PFX "Illegal memory type %d\n", type);
1214                 return ret;
1215         }
1216
1217         man = &bdev->man[type];
1218         if (man->has_type) {
1219                 printk(KERN_ERR TTM_PFX
1220                        "Memory manager already initialized for type %d\n",
1221                        type);
1222                 return ret;
1223         }
1224
1225         ret = bdev->driver->init_mem_type(bdev, type, man);
1226         if (ret)
1227                 return ret;
1228
1229         ret = 0;
1230         if (type != TTM_PL_SYSTEM) {
1231                 if (!p_size) {
1232                         printk(KERN_ERR TTM_PFX
1233                                "Zero size memory manager type %d\n",
1234                                type);
1235                         return ret;
1236                 }
1237                 ret = drm_mm_init(&man->manager, p_offset, p_size);
1238                 if (ret)
1239                         return ret;
1240         }
1241         man->has_type = true;
1242         man->use_type = true;
1243         man->size = p_size;
1244
1245         INIT_LIST_HEAD(&man->lru);
1246
1247         return 0;
1248 }
1249 EXPORT_SYMBOL(ttm_bo_init_mm);
1250
1251 int ttm_bo_device_release(struct ttm_bo_device *bdev)
1252 {
1253         int ret = 0;
1254         unsigned i = TTM_NUM_MEM_TYPES;
1255         struct ttm_mem_type_manager *man;
1256
1257         while (i--) {
1258                 man = &bdev->man[i];
1259                 if (man->has_type) {
1260                         man->use_type = false;
1261                         if ((i != TTM_PL_SYSTEM) && ttm_bo_clean_mm(bdev, i)) {
1262                                 ret = -EBUSY;
1263                                 printk(KERN_ERR TTM_PFX
1264                                        "DRM memory manager type %d "
1265                                        "is not clean.\n", i);
1266                         }
1267                         man->has_type = false;
1268                 }
1269         }
1270
1271         if (!cancel_delayed_work(&bdev->wq))
1272                 flush_scheduled_work();
1273
1274         while (ttm_bo_delayed_delete(bdev, true))
1275                 ;
1276
1277         spin_lock(&bdev->lru_lock);
1278         if (list_empty(&bdev->ddestroy))
1279                 TTM_DEBUG("Delayed destroy list was clean\n");
1280
1281         if (list_empty(&bdev->man[0].lru))
1282                 TTM_DEBUG("Swap list was clean\n");
1283         spin_unlock(&bdev->lru_lock);
1284
1285         ttm_mem_unregister_shrink(bdev->mem_glob, &bdev->shrink);
1286         BUG_ON(!drm_mm_clean(&bdev->addr_space_mm));
1287         write_lock(&bdev->vm_lock);
1288         drm_mm_takedown(&bdev->addr_space_mm);
1289         write_unlock(&bdev->vm_lock);
1290
1291         __free_page(bdev->dummy_read_page);
1292         return ret;
1293 }
1294 EXPORT_SYMBOL(ttm_bo_device_release);
1295
1296 /*
1297  * This function is intended to be called on drm driver load.
1298  * If you decide to call it from firstopen, you must protect the call
1299  * from a potentially racing ttm_bo_driver_finish in lastclose.
1300  * (This may happen on X server restart).
1301  */
1302
1303 int ttm_bo_device_init(struct ttm_bo_device *bdev,
1304                        struct ttm_mem_global *mem_glob,
1305                        struct ttm_bo_driver *driver, uint64_t file_page_offset)
1306 {
1307         int ret = -EINVAL;
1308
1309         bdev->dummy_read_page = NULL;
1310         rwlock_init(&bdev->vm_lock);
1311         spin_lock_init(&bdev->lru_lock);
1312
1313         bdev->driver = driver;
1314         bdev->mem_glob = mem_glob;
1315
1316         memset(bdev->man, 0, sizeof(bdev->man));
1317
1318         bdev->dummy_read_page = alloc_page(__GFP_ZERO | GFP_DMA32);
1319         if (unlikely(bdev->dummy_read_page == NULL)) {
1320                 ret = -ENOMEM;
1321                 goto out_err0;
1322         }
1323
1324         /*
1325          * Initialize the system memory buffer type.
1326          * Other types need to be driver / IOCTL initialized.
1327          */
1328         ret = ttm_bo_init_mm(bdev, TTM_PL_SYSTEM, 0, 0);
1329         if (unlikely(ret != 0))
1330                 goto out_err1;
1331
1332         bdev->addr_space_rb = RB_ROOT;
1333         ret = drm_mm_init(&bdev->addr_space_mm, file_page_offset, 0x10000000);
1334         if (unlikely(ret != 0))
1335                 goto out_err2;
1336
1337         INIT_DELAYED_WORK(&bdev->wq, ttm_bo_delayed_workqueue);
1338         bdev->nice_mode = true;
1339         INIT_LIST_HEAD(&bdev->ddestroy);
1340         INIT_LIST_HEAD(&bdev->swap_lru);
1341         bdev->dev_mapping = NULL;
1342         ttm_mem_init_shrink(&bdev->shrink, ttm_bo_swapout);
1343         ret = ttm_mem_register_shrink(mem_glob, &bdev->shrink);
1344         if (unlikely(ret != 0)) {
1345                 printk(KERN_ERR TTM_PFX
1346                        "Could not register buffer object swapout.\n");
1347                 goto out_err2;
1348         }
1349
1350         bdev->ttm_bo_extra_size =
1351                 ttm_round_pot(sizeof(struct ttm_tt)) +
1352                 ttm_round_pot(sizeof(struct ttm_backend));
1353
1354         bdev->ttm_bo_size = bdev->ttm_bo_extra_size +
1355                 ttm_round_pot(sizeof(struct ttm_buffer_object));
1356
1357         return 0;
1358 out_err2:
1359         ttm_bo_clean_mm(bdev, 0);
1360 out_err1:
1361         __free_page(bdev->dummy_read_page);
1362 out_err0:
1363         return ret;
1364 }
1365 EXPORT_SYMBOL(ttm_bo_device_init);
1366
1367 /*
1368  * buffer object vm functions.
1369  */
1370
1371 bool ttm_mem_reg_is_pci(struct ttm_bo_device *bdev, struct ttm_mem_reg *mem)
1372 {
1373         struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
1374
1375         if (!(man->flags & TTM_MEMTYPE_FLAG_FIXED)) {
1376                 if (mem->mem_type == TTM_PL_SYSTEM)
1377                         return false;
1378
1379                 if (man->flags & TTM_MEMTYPE_FLAG_CMA)
1380                         return false;
1381
1382                 if (mem->placement & TTM_PL_FLAG_CACHED)
1383                         return false;
1384         }
1385         return true;
1386 }
1387
1388 int ttm_bo_pci_offset(struct ttm_bo_device *bdev,
1389                       struct ttm_mem_reg *mem,
1390                       unsigned long *bus_base,
1391                       unsigned long *bus_offset, unsigned long *bus_size)
1392 {
1393         struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
1394
1395         *bus_size = 0;
1396         if (!(man->flags & TTM_MEMTYPE_FLAG_MAPPABLE))
1397                 return -EINVAL;
1398
1399         if (ttm_mem_reg_is_pci(bdev, mem)) {
1400                 *bus_offset = mem->mm_node->start << PAGE_SHIFT;
1401                 *bus_size = mem->num_pages << PAGE_SHIFT;
1402                 *bus_base = man->io_offset;
1403         }
1404
1405         return 0;
1406 }
1407
1408 void ttm_bo_unmap_virtual(struct ttm_buffer_object *bo)
1409 {
1410         struct ttm_bo_device *bdev = bo->bdev;
1411         loff_t offset = (loff_t) bo->addr_space_offset;
1412         loff_t holelen = ((loff_t) bo->mem.num_pages) << PAGE_SHIFT;
1413
1414         if (!bdev->dev_mapping)
1415                 return;
1416
1417         unmap_mapping_range(bdev->dev_mapping, offset, holelen, 1);
1418 }
1419
1420 static void ttm_bo_vm_insert_rb(struct ttm_buffer_object *bo)
1421 {
1422         struct ttm_bo_device *bdev = bo->bdev;
1423         struct rb_node **cur = &bdev->addr_space_rb.rb_node;
1424         struct rb_node *parent = NULL;
1425         struct ttm_buffer_object *cur_bo;
1426         unsigned long offset = bo->vm_node->start;
1427         unsigned long cur_offset;
1428
1429         while (*cur) {
1430                 parent = *cur;
1431                 cur_bo = rb_entry(parent, struct ttm_buffer_object, vm_rb);
1432                 cur_offset = cur_bo->vm_node->start;
1433                 if (offset < cur_offset)
1434                         cur = &parent->rb_left;
1435                 else if (offset > cur_offset)
1436                         cur = &parent->rb_right;
1437                 else
1438                         BUG();
1439         }
1440
1441         rb_link_node(&bo->vm_rb, parent, cur);
1442         rb_insert_color(&bo->vm_rb, &bdev->addr_space_rb);
1443 }
1444
1445 /**
1446  * ttm_bo_setup_vm:
1447  *
1448  * @bo: the buffer to allocate address space for
1449  *
1450  * Allocate address space in the drm device so that applications
1451  * can mmap the buffer and access the contents. This only
1452  * applies to ttm_bo_type_device objects as others are not
1453  * placed in the drm device address space.
1454  */
1455
1456 static int ttm_bo_setup_vm(struct ttm_buffer_object *bo)
1457 {
1458         struct ttm_bo_device *bdev = bo->bdev;
1459         int ret;
1460
1461 retry_pre_get:
1462         ret = drm_mm_pre_get(&bdev->addr_space_mm);
1463         if (unlikely(ret != 0))
1464                 return ret;
1465
1466         write_lock(&bdev->vm_lock);
1467         bo->vm_node = drm_mm_search_free(&bdev->addr_space_mm,
1468                                          bo->mem.num_pages, 0, 0);
1469
1470         if (unlikely(bo->vm_node == NULL)) {
1471                 ret = -ENOMEM;
1472                 goto out_unlock;
1473         }
1474
1475         bo->vm_node = drm_mm_get_block_atomic(bo->vm_node,
1476                                               bo->mem.num_pages, 0);
1477
1478         if (unlikely(bo->vm_node == NULL)) {
1479                 write_unlock(&bdev->vm_lock);
1480                 goto retry_pre_get;
1481         }
1482
1483         ttm_bo_vm_insert_rb(bo);
1484         write_unlock(&bdev->vm_lock);
1485         bo->addr_space_offset = ((uint64_t) bo->vm_node->start) << PAGE_SHIFT;
1486
1487         return 0;
1488 out_unlock:
1489         write_unlock(&bdev->vm_lock);
1490         return ret;
1491 }
1492
1493 int ttm_bo_wait(struct ttm_buffer_object *bo,
1494                 bool lazy, bool interruptible, bool no_wait)
1495 {
1496         struct ttm_bo_driver *driver = bo->bdev->driver;
1497         void *sync_obj;
1498         void *sync_obj_arg;
1499         int ret = 0;
1500
1501         if (likely(bo->sync_obj == NULL))
1502                 return 0;
1503
1504         while (bo->sync_obj) {
1505
1506                 if (driver->sync_obj_signaled(bo->sync_obj, bo->sync_obj_arg)) {
1507                         void *tmp_obj = bo->sync_obj;
1508                         bo->sync_obj = NULL;
1509                         clear_bit(TTM_BO_PRIV_FLAG_MOVING, &bo->priv_flags);
1510                         spin_unlock(&bo->lock);
1511                         driver->sync_obj_unref(&tmp_obj);
1512                         spin_lock(&bo->lock);
1513                         continue;
1514                 }
1515
1516                 if (no_wait)
1517                         return -EBUSY;
1518
1519                 sync_obj = driver->sync_obj_ref(bo->sync_obj);
1520                 sync_obj_arg = bo->sync_obj_arg;
1521                 spin_unlock(&bo->lock);
1522                 ret = driver->sync_obj_wait(sync_obj, sync_obj_arg,
1523                                             lazy, interruptible);
1524                 if (unlikely(ret != 0)) {
1525                         driver->sync_obj_unref(&sync_obj);
1526                         spin_lock(&bo->lock);
1527                         return ret;
1528                 }
1529                 spin_lock(&bo->lock);
1530                 if (likely(bo->sync_obj == sync_obj &&
1531                            bo->sync_obj_arg == sync_obj_arg)) {
1532                         void *tmp_obj = bo->sync_obj;
1533                         bo->sync_obj = NULL;
1534                         clear_bit(TTM_BO_PRIV_FLAG_MOVING,
1535                                   &bo->priv_flags);
1536                         spin_unlock(&bo->lock);
1537                         driver->sync_obj_unref(&sync_obj);
1538                         driver->sync_obj_unref(&tmp_obj);
1539                         spin_lock(&bo->lock);
1540                 }
1541         }
1542         return 0;
1543 }
1544 EXPORT_SYMBOL(ttm_bo_wait);
1545
1546 void ttm_bo_unblock_reservation(struct ttm_buffer_object *bo)
1547 {
1548         atomic_set(&bo->reserved, 0);
1549         wake_up_all(&bo->event_queue);
1550 }
1551
1552 int ttm_bo_block_reservation(struct ttm_buffer_object *bo, bool interruptible,
1553                              bool no_wait)
1554 {
1555         int ret;
1556
1557         while (unlikely(atomic_cmpxchg(&bo->reserved, 0, 1) != 0)) {
1558                 if (no_wait)
1559                         return -EBUSY;
1560                 else if (interruptible) {
1561                         ret = wait_event_interruptible
1562                             (bo->event_queue, atomic_read(&bo->reserved) == 0);
1563                         if (unlikely(ret != 0))
1564                                 return -ERESTART;
1565                 } else {
1566                         wait_event(bo->event_queue,
1567                                    atomic_read(&bo->reserved) == 0);
1568                 }
1569         }
1570         return 0;
1571 }
1572
1573 int ttm_bo_synccpu_write_grab(struct ttm_buffer_object *bo, bool no_wait)
1574 {
1575         int ret = 0;
1576
1577         /*
1578          * Using ttm_bo_reserve instead of ttm_bo_block_reservation
1579          * makes sure the lru lists are updated.
1580          */
1581
1582         ret = ttm_bo_reserve(bo, true, no_wait, false, 0);
1583         if (unlikely(ret != 0))
1584                 return ret;
1585         spin_lock(&bo->lock);
1586         ret = ttm_bo_wait(bo, false, true, no_wait);
1587         spin_unlock(&bo->lock);
1588         if (likely(ret == 0))
1589                 atomic_inc(&bo->cpu_writers);
1590         ttm_bo_unreserve(bo);
1591         return ret;
1592 }
1593
1594 void ttm_bo_synccpu_write_release(struct ttm_buffer_object *bo)
1595 {
1596         if (atomic_dec_and_test(&bo->cpu_writers))
1597                 wake_up_all(&bo->event_queue);
1598 }
1599
1600 /**
1601  * A buffer object shrink method that tries to swap out the first
1602  * buffer object on the bo_global::swap_lru list.
1603  */
1604
1605 static int ttm_bo_swapout(struct ttm_mem_shrink *shrink)
1606 {
1607         struct ttm_bo_device *bdev =
1608             container_of(shrink, struct ttm_bo_device, shrink);
1609         struct ttm_buffer_object *bo;
1610         int ret = -EBUSY;
1611         int put_count;
1612         uint32_t swap_placement = (TTM_PL_FLAG_CACHED | TTM_PL_FLAG_SYSTEM);
1613
1614         spin_lock(&bdev->lru_lock);
1615         while (ret == -EBUSY) {
1616                 if (unlikely(list_empty(&bdev->swap_lru))) {
1617                         spin_unlock(&bdev->lru_lock);
1618                         return -EBUSY;
1619                 }
1620
1621                 bo = list_first_entry(&bdev->swap_lru,
1622                                       struct ttm_buffer_object, swap);
1623                 kref_get(&bo->list_kref);
1624
1625                 /**
1626                  * Reserve buffer. Since we unlock while sleeping, we need
1627                  * to re-check that nobody removed us from the swap-list while
1628                  * we slept.
1629                  */
1630
1631                 ret = ttm_bo_reserve_locked(bo, false, true, false, 0);
1632                 if (unlikely(ret == -EBUSY)) {
1633                         spin_unlock(&bdev->lru_lock);
1634                         ttm_bo_wait_unreserved(bo, false);
1635                         kref_put(&bo->list_kref, ttm_bo_release_list);
1636                         spin_lock(&bdev->lru_lock);
1637                 }
1638         }
1639
1640         BUG_ON(ret != 0);
1641         put_count = ttm_bo_del_from_lru(bo);
1642         spin_unlock(&bdev->lru_lock);
1643
1644         while (put_count--)
1645                 kref_put(&bo->list_kref, ttm_bo_ref_bug);
1646
1647         /**
1648          * Wait for GPU, then move to system cached.
1649          */
1650
1651         spin_lock(&bo->lock);
1652         ret = ttm_bo_wait(bo, false, false, false);
1653         spin_unlock(&bo->lock);
1654
1655         if (unlikely(ret != 0))
1656                 goto out;
1657
1658         if ((bo->mem.placement & swap_placement) != swap_placement) {
1659                 struct ttm_mem_reg evict_mem;
1660
1661                 evict_mem = bo->mem;
1662                 evict_mem.mm_node = NULL;
1663                 evict_mem.placement = TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED;
1664                 evict_mem.mem_type = TTM_PL_SYSTEM;
1665
1666                 ret = ttm_bo_handle_move_mem(bo, &evict_mem, true,
1667                                              false, false);
1668                 if (unlikely(ret != 0))
1669                         goto out;
1670         }
1671
1672         ttm_bo_unmap_virtual(bo);
1673
1674         /**
1675          * Swap out. Buffer will be swapped in again as soon as
1676          * anyone tries to access a ttm page.
1677          */
1678
1679         ret = ttm_tt_swapout(bo->ttm, bo->persistant_swap_storage);
1680 out:
1681
1682         /**
1683          *
1684          * Unreserve without putting on LRU to avoid swapping out an
1685          * already swapped buffer.
1686          */
1687
1688         atomic_set(&bo->reserved, 0);
1689         wake_up_all(&bo->event_queue);
1690         kref_put(&bo->list_kref, ttm_bo_release_list);
1691         return ret;
1692 }
1693
1694 void ttm_bo_swapout_all(struct ttm_bo_device *bdev)
1695 {
1696         while (ttm_bo_swapout(&bdev->shrink) == 0)
1697                 ;
1698 }