drivers/gpu/drm/ttm/ttm_bo.c

   1 /**************************************************************************
   2  *
   3  * Copyright (c) 2006-2009 VMware, Inc., Palo Alto, CA., USA
   4  * All Rights Reserved.
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * copy of this software and associated documentation files (the
   8  * "Software"), to deal in the Software without restriction, including
   9  * without limitation the rights to use, copy, modify, merge, publish,
  10  * distribute, sub license, and/or sell copies of the Software, and to
  11  * permit persons to whom the Software is furnished to do so, subject to
  12  * the following conditions:
  13  *
  14  * The above copyright notice and this permission notice (including the
  15  * next paragraph) shall be included in all copies or substantial portions
  16  * of the Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  19  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  20  * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
  21  * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
  22  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
  23  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
  24  * USE OR OTHER DEALINGS IN THE SOFTWARE.
  25  *
  26  **************************************************************************/
  27 /*
  28  * Authors: Thomas Hellstrom <thellstrom-at-vmware-dot-com>
  29  */
  30
  31 #include "ttm/ttm_module.h"
  32 #include "ttm/ttm_bo_driver.h"
  33 #include "ttm/ttm_placement.h"
  34 #include <linux/jiffies.h>
  35 #include <linux/slab.h>
  36 #include <linux/sched.h>
  37 #include <linux/mm.h>
  38 #include <linux/file.h>
  39 #include <linux/module.h>
  40 #include <asm/atomic.h>
  41
  42 #define TTM_ASSERT_LOCKED(param)
  43 #define TTM_DEBUG(fmt, arg...)
  44 #define TTM_BO_HASH_ORDER 13
  45
  46 static int ttm_bo_setup_vm(struct ttm_buffer_object *bo);
  47 static int ttm_bo_swapout(struct ttm_mem_shrink *shrink);
  48 static void ttm_bo_global_kobj_release(struct kobject *kobj);
  49
  50 static struct attribute ttm_bo_count = {
  51         .name = "bo_count",
  52         .mode = S_IRUGO
  53 };
  54
  55 static inline int ttm_mem_type_from_flags(uint32_t flags, uint32_t *mem_type)
  56 {
  57         int i;
  58
  59         for (i = 0; i <= TTM_PL_PRIV5; i++)
  60                 if (flags & (1 << i)) {
  61                         *mem_type = i;
  62                         return 0;
  63                 }
  64         return -EINVAL;
  65 }
  66
  67 static void ttm_mem_type_debug(struct ttm_bo_device *bdev, int mem_type)
  68 {
  69         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
  70
  71         printk(KERN_ERR TTM_PFX "    has_type: %d\n", man->has_type);
  72         printk(KERN_ERR TTM_PFX "    use_type: %d\n", man->use_type);
  73         printk(KERN_ERR TTM_PFX "    flags: 0x%08X\n", man->flags);
  74         printk(KERN_ERR TTM_PFX "    gpu_offset: 0x%08lX\n", man->gpu_offset);
  75         printk(KERN_ERR TTM_PFX "    size: %llu\n", man->size);
  76         printk(KERN_ERR TTM_PFX "    available_caching: 0x%08X\n",
  77                 man->available_caching);
  78         printk(KERN_ERR TTM_PFX "    default_caching: 0x%08X\n",
  79                 man->default_caching);
  80         if (mem_type != TTM_PL_SYSTEM)
  81                 (*man->func->debug)(man, TTM_PFX);
  82 }
  83
  84 static void ttm_bo_mem_space_debug(struct ttm_buffer_object *bo,
  85                                         struct ttm_placement *placement)
  86 {
  87         int i, ret, mem_type;
  88
  89         printk(KERN_ERR TTM_PFX "No space for %p (%lu pages, %luK, %luM)\n",
  90                 bo, bo->mem.num_pages, bo->mem.size >> 10,
  91                 bo->mem.size >> 20);
  92         for (i = 0; i < placement->num_placement; i++) {
  93                 ret = ttm_mem_type_from_flags(placement->placement[i],
  94                                                 &mem_type);
  95                 if (ret)
  96                         return;
  97                 printk(KERN_ERR TTM_PFX "  placement[%d]=0x%08X (%d)\n",
  98                         i, placement->placement[i], mem_type);
  99                 ttm_mem_type_debug(bo->bdev, mem_type);
 100         }
 101 }
 102
 103 static ssize_t ttm_bo_global_show(struct kobject *kobj,
 104                                   struct attribute *attr,
 105                                   char *buffer)
 106 {
 107         struct ttm_bo_global *glob =
 108                 container_of(kobj, struct ttm_bo_global, kobj);
 109
 110         return snprintf(buffer, PAGE_SIZE, "%lu\n",
 111                         (unsigned long) atomic_read(&glob->bo_count));
 112 }
 113
 114 static struct attribute *ttm_bo_global_attrs[] = {
 115         &ttm_bo_count,
 116         NULL
 117 };
 118
 119 static const struct sysfs_ops ttm_bo_global_ops = {
 120         .show = &ttm_bo_global_show
 121 };
 122
 123 static struct kobj_type ttm_bo_glob_kobj_type  = {
 124         .release = &ttm_bo_global_kobj_release,
 125         .sysfs_ops = &ttm_bo_global_ops,
 126         .default_attrs = ttm_bo_global_attrs
 127 };
 128
 129
 130 static inline uint32_t ttm_bo_type_flags(unsigned type)
 131 {
 132         return 1 << (type);
 133 }
 134
 135 static void ttm_bo_release_list(struct kref *list_kref)
 136 {
 137         struct ttm_buffer_object *bo =
 138             container_of(list_kref, struct ttm_buffer_object, list_kref);
 139         struct ttm_bo_device *bdev = bo->bdev;
 140
 141         BUG_ON(atomic_read(&bo->list_kref.refcount));
 142         BUG_ON(atomic_read(&bo->kref.refcount));
 143         BUG_ON(atomic_read(&bo->cpu_writers));
 144         BUG_ON(bo->sync_obj != NULL);
 145         BUG_ON(bo->mem.mm_node != NULL);
 146         BUG_ON(!list_empty(&bo->lru));
 147         BUG_ON(!list_empty(&bo->ddestroy));
 148
 149         if (bo->ttm)
 150                 ttm_tt_destroy(bo->ttm);
 151         atomic_dec(&bo->glob->bo_count);
 152         if (bo->destroy)
 153                 bo->destroy(bo);
 154         else {
 155                 ttm_mem_global_free(bdev->glob->mem_glob, bo->acc_size);
 156                 kfree(bo);
 157         }
 158 }
 159
 160 int ttm_bo_wait_unreserved(struct ttm_buffer_object *bo, bool interruptible)
 161 {
 162         if (interruptible) {
 163                 return wait_event_interruptible(bo->event_queue,
 164                                                atomic_read(&bo->reserved) == 0);
 165         } else {
 166                 wait_event(bo->event_queue, atomic_read(&bo->reserved) == 0);
 167                 return 0;
 168         }
 169 }
 170 EXPORT_SYMBOL(ttm_bo_wait_unreserved);
 171
 172 static void ttm_bo_add_to_lru(struct ttm_buffer_object *bo)
 173 {
 174         struct ttm_bo_device *bdev = bo->bdev;
 175         struct ttm_mem_type_manager *man;
 176
 177         BUG_ON(!atomic_read(&bo->reserved));
 178
 179         if (!(bo->mem.placement & TTM_PL_FLAG_NO_EVICT)) {
 180
 181                 BUG_ON(!list_empty(&bo->lru));
 182
 183                 man = &bdev->man[bo->mem.mem_type];
 184                 list_add_tail(&bo->lru, &man->lru);
 185                 kref_get(&bo->list_kref);
 186
 187                 if (bo->ttm != NULL) {
 188                         list_add_tail(&bo->swap, &bo->glob->swap_lru);
 189                         kref_get(&bo->list_kref);
 190                 }
 191         }
 192 }
 193
 194 /**
 195  * Call with the lru_lock held.
 196  */
 197
 198 static int ttm_bo_del_from_lru(struct ttm_buffer_object *bo)
 199 {
 200         int put_count = 0;
 201
 202         if (!list_empty(&bo->swap)) {
 203                 list_del_init(&bo->swap);
 204                 ++put_count;
 205         }
 206         if (!list_empty(&bo->lru)) {
 207                 list_del_init(&bo->lru);
 208                 ++put_count;
 209         }
 210
 211         /*
 212          * TODO: Add a driver hook to delete from
 213          * driver-specific LRU's here.
 214          */
 215
 216         return put_count;
 217 }
 218
 219 int ttm_bo_reserve_locked(struct ttm_buffer_object *bo,
 220                           bool interruptible,
 221                           bool no_wait, bool use_sequence, uint32_t sequence)
 222 {
 223         struct ttm_bo_global *glob = bo->glob;
 224         int ret;
 225
 226         while (unlikely(atomic_cmpxchg(&bo->reserved, 0, 1) != 0)) {
 227                 if (use_sequence && bo->seq_valid &&
 228                         (sequence - bo->val_seq < (1 << 31))) {
 229                         return -EAGAIN;
 230                 }
 231
 232                 if (no_wait)
 233                         return -EBUSY;
 234
 235                 spin_unlock(&glob->lru_lock);
 236                 ret = ttm_bo_wait_unreserved(bo, interruptible);
 237                 spin_lock(&glob->lru_lock);
 238
 239                 if (unlikely(ret))
 240                         return ret;
 241         }
 242
 243         if (use_sequence) {
 244                 bo->val_seq = sequence;
 245                 bo->seq_valid = true;
 246         } else {
 247                 bo->seq_valid = false;
 248         }
 249
 250         return 0;
 251 }
 252 EXPORT_SYMBOL(ttm_bo_reserve);
 253
 254 static void ttm_bo_ref_bug(struct kref *list_kref)
 255 {
 256         BUG();
 257 }
 258
 259 int ttm_bo_reserve(struct ttm_buffer_object *bo,
 260                    bool interruptible,
 261                    bool no_wait, bool use_sequence, uint32_t sequence)
 262 {
 263         struct ttm_bo_global *glob = bo->glob;
 264         int put_count = 0;
 265         int ret;
 266
 267         spin_lock(&glob->lru_lock);
 268         ret = ttm_bo_reserve_locked(bo, interruptible, no_wait, use_sequence,
 269                                     sequence);
 270         if (likely(ret == 0))
 271                 put_count = ttm_bo_del_from_lru(bo);
 272         spin_unlock(&glob->lru_lock);
 273
 274         while (put_count--)
 275                 kref_put(&bo->list_kref, ttm_bo_ref_bug);
 276
 277         return ret;
 278 }
 279
 280 void ttm_bo_unreserve(struct ttm_buffer_object *bo)
 281 {
 282         struct ttm_bo_global *glob = bo->glob;
 283
 284         spin_lock(&glob->lru_lock);
 285         ttm_bo_add_to_lru(bo);
 286         atomic_set(&bo->reserved, 0);
 287         wake_up_all(&bo->event_queue);
 288         spin_unlock(&glob->lru_lock);
 289 }
 290 EXPORT_SYMBOL(ttm_bo_unreserve);
 291
 292 /*
 293  * Call bo->mutex locked.
 294  */
 295 static int ttm_bo_add_ttm(struct ttm_buffer_object *bo, bool zero_alloc)
 296 {
 297         struct ttm_bo_device *bdev = bo->bdev;
 298         struct ttm_bo_global *glob = bo->glob;
 299         int ret = 0;
 300         uint32_t page_flags = 0;
 301
 302         TTM_ASSERT_LOCKED(&bo->mutex);
 303         bo->ttm = NULL;
 304
 305         if (bdev->need_dma32)
 306                 page_flags |= TTM_PAGE_FLAG_DMA32;
 307
 308         switch (bo->type) {
 309         case ttm_bo_type_device:
 310                 if (zero_alloc)
 311                         page_flags |= TTM_PAGE_FLAG_ZERO_ALLOC;
 312         case ttm_bo_type_kernel:
 313                 bo->ttm = ttm_tt_create(bdev, bo->num_pages << PAGE_SHIFT,
 314                                         page_flags, glob->dummy_read_page);
 315                 if (unlikely(bo->ttm == NULL))
 316                         ret = -ENOMEM;
 317                 break;
 318         case ttm_bo_type_user:
 319                 bo->ttm = ttm_tt_create(bdev, bo->num_pages << PAGE_SHIFT,
 320                                         page_flags | TTM_PAGE_FLAG_USER,
 321                                         glob->dummy_read_page);
 322                 if (unlikely(bo->ttm == NULL)) {
 323                         ret = -ENOMEM;
 324                         break;
 325                 }
 326
 327                 ret = ttm_tt_set_user(bo->ttm, current,
 328                                       bo->buffer_start, bo->num_pages);
 329                 if (unlikely(ret != 0))
 330                         ttm_tt_destroy(bo->ttm);
 331                 break;
 332         default:
 333                 printk(KERN_ERR TTM_PFX "Illegal buffer object type\n");
 334                 ret = -EINVAL;
 335                 break;
 336         }
 337
 338         return ret;
 339 }
 340
 341 static int ttm_bo_handle_move_mem(struct ttm_buffer_object *bo,
 342                                   struct ttm_mem_reg *mem,
 343                                   bool evict, bool interruptible,
 344                                   bool no_wait_reserve, bool no_wait_gpu)
 345 {
 346         struct ttm_bo_device *bdev = bo->bdev;
 347         bool old_is_pci = ttm_mem_reg_is_pci(bdev, &bo->mem);
 348         bool new_is_pci = ttm_mem_reg_is_pci(bdev, mem);
 349         struct ttm_mem_type_manager *old_man = &bdev->man[bo->mem.mem_type];
 350         struct ttm_mem_type_manager *new_man = &bdev->man[mem->mem_type];
 351         int ret = 0;
 352
 353         if (old_is_pci || new_is_pci ||
 354             ((mem->placement & bo->mem.placement & TTM_PL_MASK_CACHING) == 0))
 355                 ttm_bo_unmap_virtual(bo);
 356
 357         /*
 358          * Create and bind a ttm if required.
 359          */
 360
 361         if (!(new_man->flags & TTM_MEMTYPE_FLAG_FIXED) && (bo->ttm == NULL)) {
 362                 ret = ttm_bo_add_ttm(bo, false);
 363                 if (ret)
 364                         goto out_err;
 365
 366                 ret = ttm_tt_set_placement_caching(bo->ttm, mem->placement);
 367                 if (ret)
 368                         goto out_err;
 369
 370                 if (mem->mem_type != TTM_PL_SYSTEM) {
 371                         ret = ttm_tt_bind(bo->ttm, mem);
 372                         if (ret)
 373                                 goto out_err;
 374                 }
 375
 376                 if (bo->mem.mem_type == TTM_PL_SYSTEM) {
 377                         bo->mem = *mem;
 378                         mem->mm_node = NULL;
 379                         goto moved;
 380                 }
 381
 382         }
 383
 384         if (bdev->driver->move_notify)
 385                 bdev->driver->move_notify(bo, mem);
 386
 387         if (!(old_man->flags & TTM_MEMTYPE_FLAG_FIXED) &&
 388             !(new_man->flags & TTM_MEMTYPE_FLAG_FIXED))
 389                 ret = ttm_bo_move_ttm(bo, evict, no_wait_reserve, no_wait_gpu, mem);
 390         else if (bdev->driver->move)
 391                 ret = bdev->driver->move(bo, evict, interruptible,
 392                                          no_wait_reserve, no_wait_gpu, mem);
 393         else
 394                 ret = ttm_bo_move_memcpy(bo, evict, no_wait_reserve, no_wait_gpu, mem);
 395
 396         if (ret)
 397                 goto out_err;
 398
 399 moved:
 400         if (bo->evicted) {
 401                 ret = bdev->driver->invalidate_caches(bdev, bo->mem.placement);
 402                 if (ret)
 403                         printk(KERN_ERR TTM_PFX "Can not flush read caches\n");
 404                 bo->evicted = false;
 405         }
 406
 407         if (bo->mem.mm_node) {
 408                 spin_lock(&bo->lock);
 409                 bo->offset = (bo->mem.start << PAGE_SHIFT) +
 410                     bdev->man[bo->mem.mem_type].gpu_offset;
 411                 bo->cur_placement = bo->mem.placement;
 412                 spin_unlock(&bo->lock);
 413         } else
 414                 bo->offset = 0;
 415
 416         return 0;
 417
 418 out_err:
 419         new_man = &bdev->man[bo->mem.mem_type];
 420         if ((new_man->flags & TTM_MEMTYPE_FLAG_FIXED) && bo->ttm) {
 421                 ttm_tt_unbind(bo->ttm);
 422                 ttm_tt_destroy(bo->ttm);
 423                 bo->ttm = NULL;
 424         }
 425
 426         return ret;
 427 }
 428
 429 /**
 430  * Call bo::reserved.
 431  * Will release GPU memory type usage on destruction.
 432  * This is the place to put in driver specific hooks to release
 433  * driver private resources.
 434  * Will release the bo::reserved lock.
 435  */
 436
 437 static void ttm_bo_cleanup_memtype_use(struct ttm_buffer_object *bo)
 438 {
 439         if (bo->ttm) {
 440                 ttm_tt_unbind(bo->ttm);
 441                 ttm_tt_destroy(bo->ttm);
 442                 bo->ttm = NULL;
 443         }
 444
 445         ttm_bo_mem_put(bo, &bo->mem);
 446
 447         atomic_set(&bo->reserved, 0);
 448
 449         /*
 450          * Make processes trying to reserve really pick it up.
 451          */
 452         smp_mb__after_atomic_dec();
 453         wake_up_all(&bo->event_queue);
 454 }
 455
 456 static void ttm_bo_cleanup_refs_or_queue(struct ttm_buffer_object *bo)
 457 {
 458         struct ttm_bo_device *bdev = bo->bdev;
 459         struct ttm_bo_global *glob = bo->glob;
 460         struct ttm_bo_driver *driver;
 461         void *sync_obj = NULL;
 462         void *sync_obj_arg;
 463         int put_count;
 464         int ret;
 465
 466         spin_lock(&bo->lock);
 467         (void) ttm_bo_wait(bo, false, false, true);
 468         if (!bo->sync_obj) {
 469
 470                 spin_lock(&glob->lru_lock);
 471
 472                 /**
 473                  * Lock inversion between bo::reserve and bo::lock here,
 474                  * but that's OK, since we're only trylocking.
 475                  */
 476
 477                 ret = ttm_bo_reserve_locked(bo, false, true, false, 0);
 478
 479                 if (unlikely(ret == -EBUSY))
 480                         goto queue;
 481
 482                 spin_unlock(&bo->lock);
 483                 put_count = ttm_bo_del_from_lru(bo);
 484
 485                 spin_unlock(&glob->lru_lock);
 486                 ttm_bo_cleanup_memtype_use(bo);
 487
 488                 while (put_count--)
 489                         kref_put(&bo->list_kref, ttm_bo_ref_bug);
 490
 491                 return;
 492         } else {
 493                 spin_lock(&glob->lru_lock);
 494         }
 495 queue:
 496         driver = bdev->driver;
 497         if (bo->sync_obj)
 498                 sync_obj = driver->sync_obj_ref(bo->sync_obj);
 499         sync_obj_arg = bo->sync_obj_arg;
 500
 501         kref_get(&bo->list_kref);
 502         list_add_tail(&bo->ddestroy, &bdev->ddestroy);
 503         spin_unlock(&glob->lru_lock);
 504         spin_unlock(&bo->lock);
 505
 506         if (sync_obj) {
 507                 driver->sync_obj_flush(sync_obj, sync_obj_arg);
 508                 driver->sync_obj_unref(&sync_obj);
 509         }
 510         schedule_delayed_work(&bdev->wq,
 511                               ((HZ / 100) < 1) ? 1 : HZ / 100);
 512 }
 513
 514 /**
 515  * function ttm_bo_cleanup_refs
 516  * If bo idle, remove from delayed- and lru lists, and unref.
 517  * If not idle, do nothing.
 518  *
 519  * @interruptible         Any sleeps should occur interruptibly.
 520  * @no_wait_reserve       Never wait for reserve. Return -EBUSY instead.
 521  * @no_wait_gpu           Never wait for gpu. Return -EBUSY instead.
 522  */
 523
 524 static int ttm_bo_cleanup_refs(struct ttm_buffer_object *bo,
 525                                bool interruptible,
 526                                bool no_wait_reserve,
 527                                bool no_wait_gpu)
 528 {
 529         struct ttm_bo_global *glob = bo->glob;
 530         int put_count;
 531         int ret = 0;
 532
 533 retry:
 534         spin_lock(&bo->lock);
 535         ret = ttm_bo_wait(bo, false, interruptible, no_wait_gpu);
 536         spin_unlock(&bo->lock);
 537
 538         if (unlikely(ret != 0))
 539                 return ret;
 540
 541         spin_lock(&glob->lru_lock);
 542         ret = ttm_bo_reserve_locked(bo, interruptible,
 543                                     no_wait_reserve, false, 0);
 544
 545         if (unlikely(ret != 0) || list_empty(&bo->ddestroy)) {
 546                 spin_unlock(&glob->lru_lock);
 547                 return ret;
 548         }
 549
 550         /**
 551          * We can re-check for sync object without taking
 552          * the bo::lock since setting the sync object requires
 553          * also bo::reserved. A busy object at this point may
 554          * be caused by another thread recently starting an accelerated
 555          * eviction.
 556          */
 557
 558         if (unlikely(bo->sync_obj)) {
 559                 atomic_set(&bo->reserved, 0);
 560                 wake_up_all(&bo->event_queue);
 561                 spin_unlock(&glob->lru_lock);
 562                 goto retry;
 563         }
 564
 565         put_count = ttm_bo_del_from_lru(bo);
 566         list_del_init(&bo->ddestroy);
 567         ++put_count;
 568
 569         spin_unlock(&glob->lru_lock);
 570         ttm_bo_cleanup_memtype_use(bo);
 571
 572         while (put_count--)
 573                 kref_put(&bo->list_kref, ttm_bo_ref_bug);
 574
 575         return 0;
 576 }
 577
 578 /**
 579  * Traverse the delayed list, and call ttm_bo_cleanup_refs on all
 580  * encountered buffers.
 581  */
 582
 583 static int ttm_bo_delayed_delete(struct ttm_bo_device *bdev, bool remove_all)
 584 {
 585         struct ttm_bo_global *glob = bdev->glob;
 586         struct ttm_buffer_object *entry = NULL;
 587         int ret = 0;
 588
 589         spin_lock(&glob->lru_lock);
 590         if (list_empty(&bdev->ddestroy))
 591                 goto out_unlock;
 592
 593         entry = list_first_entry(&bdev->ddestroy,
 594                 struct ttm_buffer_object, ddestroy);
 595         kref_get(&entry->list_kref);
 596
 597         for (;;) {
 598                 struct ttm_buffer_object *nentry = NULL;
 599
 600                 if (entry->ddestroy.next != &bdev->ddestroy) {
 601                         nentry = list_first_entry(&entry->ddestroy,
 602                                 struct ttm_buffer_object, ddestroy);
 603                         kref_get(&nentry->list_kref);
 604                 }
 605
 606                 spin_unlock(&glob->lru_lock);
 607                 ret = ttm_bo_cleanup_refs(entry, false, !remove_all,
 608                                           !remove_all);
 609                 kref_put(&entry->list_kref, ttm_bo_release_list);
 610                 entry = nentry;
 611
 612                 if (ret || !entry)
 613                         goto out;
 614
 615                 spin_lock(&glob->lru_lock);
 616                 if (list_empty(&entry->ddestroy))
 617                         break;
 618         }
 619
 620 out_unlock:
 621         spin_unlock(&glob->lru_lock);
 622 out:
 623         if (entry)
 624                 kref_put(&entry->list_kref, ttm_bo_release_list);
 625         return ret;
 626 }
 627
 628 static void ttm_bo_delayed_workqueue(struct work_struct *work)
 629 {
 630         struct ttm_bo_device *bdev =
 631             container_of(work, struct ttm_bo_device, wq.work);
 632
 633         if (ttm_bo_delayed_delete(bdev, false)) {
 634                 schedule_delayed_work(&bdev->wq,
 635                                       ((HZ / 100) < 1) ? 1 : HZ / 100);
 636         }
 637 }
 638
 639 static void ttm_bo_release(struct kref *kref)
 640 {
 641         struct ttm_buffer_object *bo =
 642             container_of(kref, struct ttm_buffer_object, kref);
 643         struct ttm_bo_device *bdev = bo->bdev;
 644
 645         if (likely(bo->vm_node != NULL)) {
 646                 rb_erase(&bo->vm_rb, &bdev->addr_space_rb);
 647                 drm_mm_put_block(bo->vm_node);
 648                 bo->vm_node = NULL;
 649         }
 650         write_unlock(&bdev->vm_lock);
 651         ttm_bo_cleanup_refs_or_queue(bo);
 652         kref_put(&bo->list_kref, ttm_bo_release_list);
 653         write_lock(&bdev->vm_lock);
 654 }
 655
 656 void ttm_bo_unref(struct ttm_buffer_object **p_bo)
 657 {
 658         struct ttm_buffer_object *bo = *p_bo;
 659         struct ttm_bo_device *bdev = bo->bdev;
 660
 661         *p_bo = NULL;
 662         write_lock(&bdev->vm_lock);
 663         kref_put(&bo->kref, ttm_bo_release);
 664         write_unlock(&bdev->vm_lock);
 665 }
 666 EXPORT_SYMBOL(ttm_bo_unref);
 667
 668 int ttm_bo_lock_delayed_workqueue(struct ttm_bo_device *bdev)
 669 {
 670         return cancel_delayed_work_sync(&bdev->wq);
 671 }
 672 EXPORT_SYMBOL(ttm_bo_lock_delayed_workqueue);
 673
 674 void ttm_bo_unlock_delayed_workqueue(struct ttm_bo_device *bdev, int resched)
 675 {
 676         if (resched)
 677                 schedule_delayed_work(&bdev->wq,
 678                                       ((HZ / 100) < 1) ? 1 : HZ / 100);
 679 }
 680 EXPORT_SYMBOL(ttm_bo_unlock_delayed_workqueue);
 681
 682 static int ttm_bo_evict(struct ttm_buffer_object *bo, bool interruptible,
 683                         bool no_wait_reserve, bool no_wait_gpu)
 684 {
 685         struct ttm_bo_device *bdev = bo->bdev;
 686         struct ttm_mem_reg evict_mem;
 687         struct ttm_placement placement;
 688         int ret = 0;
 689
 690         spin_lock(&bo->lock);
 691         ret = ttm_bo_wait(bo, false, interruptible, no_wait_gpu);
 692         spin_unlock(&bo->lock);
 693
 694         if (unlikely(ret != 0)) {
 695                 if (ret != -ERESTARTSYS) {
 696                         printk(KERN_ERR TTM_PFX
 697                                "Failed to expire sync object before "
 698                                "buffer eviction.\n");
 699                 }
 700                 goto out;
 701         }
 702
 703         BUG_ON(!atomic_read(&bo->reserved));
 704
 705         evict_mem = bo->mem;
 706         evict_mem.mm_node = NULL;
 707         evict_mem.bus.io_reserved = false;
 708
 709         placement.fpfn = 0;
 710         placement.lpfn = 0;
 711         placement.num_placement = 0;
 712         placement.num_busy_placement = 0;
 713         bdev->driver->evict_flags(bo, &placement);
 714         ret = ttm_bo_mem_space(bo, &placement, &evict_mem, interruptible,
 715                                 no_wait_reserve, no_wait_gpu);
 716         if (ret) {
 717                 if (ret != -ERESTARTSYS) {
 718                         printk(KERN_ERR TTM_PFX
 719                                "Failed to find memory space for "
 720                                "buffer 0x%p eviction.\n", bo);
 721                         ttm_bo_mem_space_debug(bo, &placement);
 722                 }
 723                 goto out;
 724         }
 725
 726         ret = ttm_bo_handle_move_mem(bo, &evict_mem, true, interruptible,
 727                                      no_wait_reserve, no_wait_gpu);
 728         if (ret) {
 729                 if (ret != -ERESTARTSYS)
 730                         printk(KERN_ERR TTM_PFX "Buffer eviction failed\n");
 731                 ttm_bo_mem_put(bo, &evict_mem);
 732                 goto out;
 733         }
 734         bo->evicted = true;
 735 out:
 736         return ret;
 737 }
 738
 739 static int ttm_mem_evict_first(struct ttm_bo_device *bdev,
 740                                 uint32_t mem_type,
 741                                 bool interruptible, bool no_wait_reserve,
 742                                 bool no_wait_gpu)
 743 {
 744         struct ttm_bo_global *glob = bdev->glob;
 745         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
 746         struct ttm_buffer_object *bo;
 747         int ret, put_count = 0;
 748
 749 retry:
 750         spin_lock(&glob->lru_lock);
 751         if (list_empty(&man->lru)) {
 752                 spin_unlock(&glob->lru_lock);
 753                 return -EBUSY;
 754         }
 755
 756         bo = list_first_entry(&man->lru, struct ttm_buffer_object, lru);
 757         kref_get(&bo->list_kref);
 758
 759         if (!list_empty(&bo->ddestroy)) {
 760                 spin_unlock(&glob->lru_lock);
 761                 ret = ttm_bo_cleanup_refs(bo, interruptible,
 762                                           no_wait_reserve, no_wait_gpu);
 763                 kref_put(&bo->list_kref, ttm_bo_release_list);
 764
 765                 if (likely(ret == 0 || ret == -ERESTARTSYS))
 766                         return ret;
 767
 768                 goto retry;
 769         }
 770
 771         ret = ttm_bo_reserve_locked(bo, false, no_wait_reserve, false, 0);
 772
 773         if (unlikely(ret == -EBUSY)) {
 774                 spin_unlock(&glob->lru_lock);
 775                 if (likely(!no_wait_gpu))
 776                         ret = ttm_bo_wait_unreserved(bo, interruptible);
 777
 778                 kref_put(&bo->list_kref, ttm_bo_release_list);
 779
 780                 /**
 781                  * We *need* to retry after releasing the lru lock.
 782                  */
 783
 784                 if (unlikely(ret != 0))
 785                         return ret;
 786                 goto retry;
 787         }
 788
 789         put_count = ttm_bo_del_from_lru(bo);
 790         spin_unlock(&glob->lru_lock);
 791
 792         BUG_ON(ret != 0);
 793
 794         while (put_count--)
 795                 kref_put(&bo->list_kref, ttm_bo_ref_bug);
 796
 797         ret = ttm_bo_evict(bo, interruptible, no_wait_reserve, no_wait_gpu);
 798         ttm_bo_unreserve(bo);
 799
 800         kref_put(&bo->list_kref, ttm_bo_release_list);
 801         return ret;
 802 }
 803
 804 void ttm_bo_mem_put(struct ttm_buffer_object *bo, struct ttm_mem_reg *mem)
 805 {
 806         struct ttm_mem_type_manager *man = &bo->bdev->man[mem->mem_type];
 807
 808         if (mem->mm_node)
 809                 (*man->func->put_node)(man, mem);
 810 }
 811 EXPORT_SYMBOL(ttm_bo_mem_put);
 812
 813 /**
 814  * Repeatedly evict memory from the LRU for @mem_type until we create enough
 815  * space, or we've evicted everything and there isn't enough space.
 816  */
 817 static int ttm_bo_mem_force_space(struct ttm_buffer_object *bo,
 818                                         uint32_t mem_type,
 819                                         struct ttm_placement *placement,
 820                                         struct ttm_mem_reg *mem,
 821                                         bool interruptible,
 822                                         bool no_wait_reserve,
 823                                         bool no_wait_gpu)
 824 {
 825         struct ttm_bo_device *bdev = bo->bdev;
 826         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
 827         int ret;
 828
 829         do {
 830                 ret = (*man->func->get_node)(man, bo, placement, mem);
 831                 if (unlikely(ret != 0))
 832                         return ret;
 833                 if (mem->mm_node)
 834                         break;
 835                 ret = ttm_mem_evict_first(bdev, mem_type, interruptible,
 836                                                 no_wait_reserve, no_wait_gpu);
 837                 if (unlikely(ret != 0))
 838                         return ret;
 839         } while (1);
 840         if (mem->mm_node == NULL)
 841                 return -ENOMEM;
 842         mem->mem_type = mem_type;
 843         return 0;
 844 }
 845
 846 static uint32_t ttm_bo_select_caching(struct ttm_mem_type_manager *man,
 847                                       uint32_t cur_placement,
 848                                       uint32_t proposed_placement)
 849 {
 850         uint32_t caching = proposed_placement & TTM_PL_MASK_CACHING;
 851         uint32_t result = proposed_placement & ~TTM_PL_MASK_CACHING;
 852
 853         /**
 854          * Keep current caching if possible.
 855          */
 856
 857         if ((cur_placement & caching) != 0)
 858                 result |= (cur_placement & caching);
 859         else if ((man->default_caching & caching) != 0)
 860                 result |= man->default_caching;
 861         else if ((TTM_PL_FLAG_CACHED & caching) != 0)
 862                 result |= TTM_PL_FLAG_CACHED;
 863         else if ((TTM_PL_FLAG_WC & caching) != 0)
 864                 result |= TTM_PL_FLAG_WC;
 865         else if ((TTM_PL_FLAG_UNCACHED & caching) != 0)
 866                 result |= TTM_PL_FLAG_UNCACHED;
 867
 868         return result;
 869 }
 870
 871 static bool ttm_bo_mt_compatible(struct ttm_mem_type_manager *man,
 872                                  bool disallow_fixed,
 873                                  uint32_t mem_type,
 874                                  uint32_t proposed_placement,
 875                                  uint32_t *masked_placement)
 876 {
 877         uint32_t cur_flags = ttm_bo_type_flags(mem_type);
 878
 879         if ((man->flags & TTM_MEMTYPE_FLAG_FIXED) && disallow_fixed)
 880                 return false;
 881
 882         if ((cur_flags & proposed_placement & TTM_PL_MASK_MEM) == 0)
 883                 return false;
 884
 885         if ((proposed_placement & man->available_caching) == 0)
 886                 return false;
 887
 888         cur_flags |= (proposed_placement & man->available_caching);
 889
 890         *masked_placement = cur_flags;
 891         return true;
 892 }
 893
 894 /**
 895  * Creates space for memory region @mem according to its type.
 896  *
 897  * This function first searches for free space in compatible memory types in
 898  * the priority order defined by the driver.  If free space isn't found, then
 899  * ttm_bo_mem_force_space is attempted in priority order to evict and find
 900  * space.
 901  */
 902 int ttm_bo_mem_space(struct ttm_buffer_object *bo,
 903                         struct ttm_placement *placement,
 904                         struct ttm_mem_reg *mem,
 905                         bool interruptible, bool no_wait_reserve,
 906                         bool no_wait_gpu)
 907 {
 908         struct ttm_bo_device *bdev = bo->bdev;
 909         struct ttm_mem_type_manager *man;
 910         uint32_t mem_type = TTM_PL_SYSTEM;
 911         uint32_t cur_flags = 0;
 912         bool type_found = false;
 913         bool type_ok = false;
 914         bool has_erestartsys = false;
 915         int i, ret;
 916
 917         mem->mm_node = NULL;
 918         for (i = 0; i < placement->num_placement; ++i) {
 919                 ret = ttm_mem_type_from_flags(placement->placement[i],
 920                                                 &mem_type);
 921                 if (ret)
 922                         return ret;
 923                 man = &bdev->man[mem_type];
 924
 925                 type_ok = ttm_bo_mt_compatible(man,
 926                                                 bo->type == ttm_bo_type_user,
 927                                                 mem_type,
 928                                                 placement->placement[i],
 929                                                 &cur_flags);
 930
 931                 if (!type_ok)
 932                         continue;
 933
 934                 cur_flags = ttm_bo_select_caching(man, bo->mem.placement,
 935                                                   cur_flags);
 936                 /*
 937                  * Use the access and other non-mapping-related flag bits from
 938                  * the memory placement flags to the current flags
 939                  */
 940                 ttm_flag_masked(&cur_flags, placement->placement[i],
 941                                 ~TTM_PL_MASK_MEMTYPE);
 942
 943                 if (mem_type == TTM_PL_SYSTEM)
 944                         break;
 945
 946                 if (man->has_type && man->use_type) {
 947                         type_found = true;
 948                         ret = (*man->func->get_node)(man, bo, placement, mem);
 949                         if (unlikely(ret))
 950                                 return ret;
 951                 }
 952                 if (mem->mm_node)
 953                         break;
 954         }
 955
 956         if ((type_ok && (mem_type == TTM_PL_SYSTEM)) || mem->mm_node) {
 957                 mem->mem_type = mem_type;
 958                 mem->placement = cur_flags;
 959                 return 0;
 960         }
 961
 962         if (!type_found)
 963                 return -EINVAL;
 964
 965         for (i = 0; i < placement->num_busy_placement; ++i) {
 966                 ret = ttm_mem_type_from_flags(placement->busy_placement[i],
 967                                                 &mem_type);
 968                 if (ret)
 969                         return ret;
 970                 man = &bdev->man[mem_type];
 971                 if (!man->has_type)
 972                         continue;
 973                 if (!ttm_bo_mt_compatible(man,
 974                                                 bo->type == ttm_bo_type_user,
 975                                                 mem_type,
 976                                                 placement->busy_placement[i],
 977                                                 &cur_flags))
 978                         continue;
 979
 980                 cur_flags = ttm_bo_select_caching(man, bo->mem.placement,
 981                                                   cur_flags);
 982                 /*
 983                  * Use the access and other non-mapping-related flag bits from
 984                  * the memory placement flags to the current flags
 985                  */
 986                 ttm_flag_masked(&cur_flags, placement->busy_placement[i],
 987                                 ~TTM_PL_MASK_MEMTYPE);
 988
 989
 990                 if (mem_type == TTM_PL_SYSTEM) {
 991                         mem->mem_type = mem_type;
 992                         mem->placement = cur_flags;
 993                         mem->mm_node = NULL;
 994                         return 0;
 995                 }
 996
 997                 ret = ttm_bo_mem_force_space(bo, mem_type, placement, mem,
 998                                                 interruptible, no_wait_reserve, no_wait_gpu);
 999                 if (ret == 0 && mem->mm_node) {
1000                         mem->placement = cur_flags;
1001                         return 0;
1002                 }
1003                 if (ret == -ERESTARTSYS)
1004                         has_erestartsys = true;
1005         }
1006         ret = (has_erestartsys) ? -ERESTARTSYS : -ENOMEM;
1007         return ret;
1008 }
1009 EXPORT_SYMBOL(ttm_bo_mem_space);
1010
1011 int ttm_bo_wait_cpu(struct ttm_buffer_object *bo, bool no_wait)
1012 {
1013         if ((atomic_read(&bo->cpu_writers) > 0) && no_wait)
1014                 return -EBUSY;
1015
1016         return wait_event_interruptible(bo->event_queue,
1017                                         atomic_read(&bo->cpu_writers) == 0);
1018 }
1019 EXPORT_SYMBOL(ttm_bo_wait_cpu);
1020
1021 int ttm_bo_move_buffer(struct ttm_buffer_object *bo,
1022                         struct ttm_placement *placement,
1023                         bool interruptible, bool no_wait_reserve,
1024                         bool no_wait_gpu)
1025 {
1026         int ret = 0;
1027         struct ttm_mem_reg mem;
1028
1029         BUG_ON(!atomic_read(&bo->reserved));
1030
1031         /*
1032          * FIXME: It's possible to pipeline buffer moves.
1033          * Have the driver move function wait for idle when necessary,
1034          * instead of doing it here.
1035          */
1036         spin_lock(&bo->lock);
1037         ret = ttm_bo_wait(bo, false, interruptible, no_wait_gpu);
1038         spin_unlock(&bo->lock);
1039         if (ret)
1040                 return ret;
1041         mem.num_pages = bo->num_pages;
1042         mem.size = mem.num_pages << PAGE_SHIFT;
1043         mem.page_alignment = bo->mem.page_alignment;
1044         mem.bus.io_reserved = false;
1045         /*
1046          * Determine where to move the buffer.
1047          */
1048         ret = ttm_bo_mem_space(bo, placement, &mem, interruptible, no_wait_reserve, no_wait_gpu);
1049         if (ret)
1050                 goto out_unlock;
1051         ret = ttm_bo_handle_move_mem(bo, &mem, false, interruptible, no_wait_reserve, no_wait_gpu);
1052 out_unlock:
1053         if (ret && mem.mm_node)
1054                 ttm_bo_mem_put(bo, &mem);
1055         return ret;
1056 }
1057
1058 static int ttm_bo_mem_compat(struct ttm_placement *placement,
1059                              struct ttm_mem_reg *mem)
1060 {
1061         int i;
1062
1063         if (mem->mm_node && placement->lpfn != 0 &&
1064             (mem->start < placement->fpfn ||
1065              mem->start + mem->num_pages > placement->lpfn))
1066                 return -1;
1067
1068         for (i = 0; i < placement->num_placement; i++) {
1069                 if ((placement->placement[i] & mem->placement &
1070                         TTM_PL_MASK_CACHING) &&
1071                         (placement->placement[i] & mem->placement &
1072                         TTM_PL_MASK_MEM))
1073                         return i;
1074         }
1075         return -1;
1076 }
1077
1078 int ttm_bo_validate(struct ttm_buffer_object *bo,
1079                         struct ttm_placement *placement,
1080                         bool interruptible, bool no_wait_reserve,
1081                         bool no_wait_gpu)
1082 {
1083         int ret;
1084
1085         BUG_ON(!atomic_read(&bo->reserved));
1086         /* Check that range is valid */
1087         if (placement->lpfn || placement->fpfn)
1088                 if (placement->fpfn > placement->lpfn ||
1089                         (placement->lpfn - placement->fpfn) < bo->num_pages)
1090                         return -EINVAL;
1091         /*
1092          * Check whether we need to move buffer.
1093          */
1094         ret = ttm_bo_mem_compat(placement, &bo->mem);
1095         if (ret < 0) {
1096                 ret = ttm_bo_move_buffer(bo, placement, interruptible, no_wait_reserve, no_wait_gpu);
1097                 if (ret)
1098                         return ret;
1099         } else {
1100                 /*
1101                  * Use the access and other non-mapping-related flag bits from
1102                  * the compatible memory placement flags to the active flags
1103                  */
1104                 ttm_flag_masked(&bo->mem.placement, placement->placement[ret],
1105                                 ~TTM_PL_MASK_MEMTYPE);
1106         }
1107         /*
1108          * We might need to add a TTM.
1109          */
1110         if (bo->mem.mem_type == TTM_PL_SYSTEM && bo->ttm == NULL) {
1111                 ret = ttm_bo_add_ttm(bo, true);
1112                 if (ret)
1113                         return ret;
1114         }
1115         return 0;
1116 }
1117 EXPORT_SYMBOL(ttm_bo_validate);
1118
1119 int ttm_bo_check_placement(struct ttm_buffer_object *bo,
1120                                 struct ttm_placement *placement)
1121 {
1122         BUG_ON((placement->fpfn || placement->lpfn) &&
1123                (bo->mem.num_pages > (placement->lpfn - placement->fpfn)));
1124
1125         return 0;
1126 }
1127
1128 int ttm_bo_init(struct ttm_bo_device *bdev,
1129                 struct ttm_buffer_object *bo,
1130                 unsigned long size,
1131                 enum ttm_bo_type type,
1132                 struct ttm_placement *placement,
1133                 uint32_t page_alignment,
1134                 unsigned long buffer_start,
1135                 bool interruptible,
1136                 struct file *persistant_swap_storage,
1137                 size_t acc_size,
1138                 void (*destroy) (struct ttm_buffer_object *))
1139 {
1140         int ret = 0;
1141         unsigned long num_pages;
1142
1143         size += buffer_start & ~PAGE_MASK;
1144         num_pages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
1145         if (num_pages == 0) {
1146                 printk(KERN_ERR TTM_PFX "Illegal buffer object size.\n");
1147                 if (destroy)
1148                         (*destroy)(bo);
1149                 else
1150                         kfree(bo);
1151                 return -EINVAL;
1152         }
1153         bo->destroy = destroy;
1154
1155         spin_lock_init(&bo->lock);
1156         kref_init(&bo->kref);
1157         kref_init(&bo->list_kref);
1158         atomic_set(&bo->cpu_writers, 0);
1159         atomic_set(&bo->reserved, 1);
1160         init_waitqueue_head(&bo->event_queue);
1161         INIT_LIST_HEAD(&bo->lru);
1162         INIT_LIST_HEAD(&bo->ddestroy);
1163         INIT_LIST_HEAD(&bo->swap);
1164         bo->bdev = bdev;
1165         bo->glob = bdev->glob;
1166         bo->type = type;
1167         bo->num_pages = num_pages;
1168         bo->mem.size = num_pages << PAGE_SHIFT;
1169         bo->mem.mem_type = TTM_PL_SYSTEM;
1170         bo->mem.num_pages = bo->num_pages;
1171         bo->mem.mm_node = NULL;
1172         bo->mem.page_alignment = page_alignment;
1173         bo->mem.bus.io_reserved = false;
1174         bo->buffer_start = buffer_start & PAGE_MASK;
1175         bo->priv_flags = 0;
1176         bo->mem.placement = (TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED);
1177         bo->seq_valid = false;
1178         bo->persistant_swap_storage = persistant_swap_storage;
1179         bo->acc_size = acc_size;
1180         atomic_inc(&bo->glob->bo_count);
1181
1182         ret = ttm_bo_check_placement(bo, placement);
1183         if (unlikely(ret != 0))
1184                 goto out_err;
1185
1186         /*
1187          * For ttm_bo_type_device buffers, allocate
1188          * address space from the device.
1189          */
1190         if (bo->type == ttm_bo_type_device) {
1191                 ret = ttm_bo_setup_vm(bo);
1192                 if (ret)
1193                         goto out_err;
1194         }
1195
1196         ret = ttm_bo_validate(bo, placement, interruptible, false, false);
1197         if (ret)
1198                 goto out_err;
1199
1200         ttm_bo_unreserve(bo);
1201         return 0;
1202
1203 out_err:
1204         ttm_bo_unreserve(bo);
1205         ttm_bo_unref(&bo);
1206
1207         return ret;
1208 }
1209 EXPORT_SYMBOL(ttm_bo_init);
1210
1211 static inline size_t ttm_bo_size(struct ttm_bo_global *glob,
1212                                  unsigned long num_pages)
1213 {
1214         size_t page_array_size = (num_pages * sizeof(void *) + PAGE_SIZE - 1) &
1215             PAGE_MASK;
1216
1217         return glob->ttm_bo_size + 2 * page_array_size;
1218 }
1219
1220 int ttm_bo_create(struct ttm_bo_device *bdev,
1221                         unsigned long size,
1222                         enum ttm_bo_type type,
1223                         struct ttm_placement *placement,
1224                         uint32_t page_alignment,
1225                         unsigned long buffer_start,
1226                         bool interruptible,
1227                         struct file *persistant_swap_storage,
1228                         struct ttm_buffer_object **p_bo)
1229 {
1230         struct ttm_buffer_object *bo;
1231         struct ttm_mem_global *mem_glob = bdev->glob->mem_glob;
1232         int ret;
1233
1234         size_t acc_size =
1235             ttm_bo_size(bdev->glob, (size + PAGE_SIZE - 1) >> PAGE_SHIFT);
1236         ret = ttm_mem_global_alloc(mem_glob, acc_size, false, false);
1237         if (unlikely(ret != 0))
1238                 return ret;
1239
1240         bo = kzalloc(sizeof(*bo), GFP_KERNEL);
1241
1242         if (unlikely(bo == NULL)) {
1243                 ttm_mem_global_free(mem_glob, acc_size);
1244                 return -ENOMEM;
1245         }
1246
1247         ret = ttm_bo_init(bdev, bo, size, type, placement, page_alignment,
1248                                 buffer_start, interruptible,
1249                                 persistant_swap_storage, acc_size, NULL);
1250         if (likely(ret == 0))
1251                 *p_bo = bo;
1252
1253         return ret;
1254 }
1255
1256 static int ttm_bo_force_list_clean(struct ttm_bo_device *bdev,
1257                                         unsigned mem_type, bool allow_errors)
1258 {
1259         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
1260         struct ttm_bo_global *glob = bdev->glob;
1261         int ret;
1262
1263         /*
1264          * Can't use standard list traversal since we're unlocking.
1265          */
1266
1267         spin_lock(&glob->lru_lock);
1268         while (!list_empty(&man->lru)) {
1269                 spin_unlock(&glob->lru_lock);
1270                 ret = ttm_mem_evict_first(bdev, mem_type, false, false, false);
1271                 if (ret) {
1272                         if (allow_errors) {
1273                                 return ret;
1274                         } else {
1275                                 printk(KERN_ERR TTM_PFX
1276                                         "Cleanup eviction failed\n");
1277                         }
1278                 }
1279                 spin_lock(&glob->lru_lock);
1280         }
1281         spin_unlock(&glob->lru_lock);
1282         return 0;
1283 }
1284
1285 int ttm_bo_clean_mm(struct ttm_bo_device *bdev, unsigned mem_type)
1286 {
1287         struct ttm_mem_type_manager *man;
1288         int ret = -EINVAL;
1289
1290         if (mem_type >= TTM_NUM_MEM_TYPES) {
1291                 printk(KERN_ERR TTM_PFX "Illegal memory type %d\n", mem_type);
1292                 return ret;
1293         }
1294         man = &bdev->man[mem_type];
1295
1296         if (!man->has_type) {
1297                 printk(KERN_ERR TTM_PFX "Trying to take down uninitialized "
1298                        "memory manager type %u\n", mem_type);
1299                 return ret;
1300         }
1301
1302         man->use_type = false;
1303         man->has_type = false;
1304
1305         ret = 0;
1306         if (mem_type > 0) {
1307                 ttm_bo_force_list_clean(bdev, mem_type, false);
1308
1309                 ret = (*man->func->takedown)(man);
1310         }
1311
1312         return ret;
1313 }
1314 EXPORT_SYMBOL(ttm_bo_clean_mm);
1315
1316 int ttm_bo_evict_mm(struct ttm_bo_device *bdev, unsigned mem_type)
1317 {
1318         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
1319
1320         if (mem_type == 0 || mem_type >= TTM_NUM_MEM_TYPES) {
1321                 printk(KERN_ERR TTM_PFX
1322                        "Illegal memory manager memory type %u.\n",
1323                        mem_type);
1324                 return -EINVAL;
1325         }
1326
1327         if (!man->has_type) {
1328                 printk(KERN_ERR TTM_PFX
1329                        "Memory type %u has not been initialized.\n",
1330                        mem_type);
1331                 return 0;
1332         }
1333
1334         return ttm_bo_force_list_clean(bdev, mem_type, true);
1335 }
1336 EXPORT_SYMBOL(ttm_bo_evict_mm);
1337
1338 int ttm_bo_init_mm(struct ttm_bo_device *bdev, unsigned type,
1339                         unsigned long p_size)
1340 {
1341         int ret = -EINVAL;
1342         struct ttm_mem_type_manager *man;
1343
1344         BUG_ON(type >= TTM_NUM_MEM_TYPES);
1345         man = &bdev->man[type];
1346         BUG_ON(man->has_type);
1347
1348         ret = bdev->driver->init_mem_type(bdev, type, man);
1349         if (ret)
1350                 return ret;
1351         man->bdev = bdev;
1352
1353         ret = 0;
1354         if (type != TTM_PL_SYSTEM) {
1355                 ret = (*man->func->init)(man, p_size);
1356                 if (ret)
1357                         return ret;
1358         }
1359         man->has_type = true;
1360         man->use_type = true;
1361         man->size = p_size;
1362
1363         INIT_LIST_HEAD(&man->lru);
1364
1365         return 0;
1366 }
1367 EXPORT_SYMBOL(ttm_bo_init_mm);
1368
1369 static void ttm_bo_global_kobj_release(struct kobject *kobj)
1370 {
1371         struct ttm_bo_global *glob =
1372                 container_of(kobj, struct ttm_bo_global, kobj);
1373
1374         ttm_mem_unregister_shrink(glob->mem_glob, &glob->shrink);
1375         __free_page(glob->dummy_read_page);
1376         kfree(glob);
1377 }
1378
1379 void ttm_bo_global_release(struct drm_global_reference *ref)
1380 {
1381         struct ttm_bo_global *glob = ref->object;
1382
1383         kobject_del(&glob->kobj);
1384         kobject_put(&glob->kobj);
1385 }
1386 EXPORT_SYMBOL(ttm_bo_global_release);
1387
1388 int ttm_bo_global_init(struct drm_global_reference *ref)
1389 {
1390         struct ttm_bo_global_ref *bo_ref =
1391                 container_of(ref, struct ttm_bo_global_ref, ref);
1392         struct ttm_bo_global *glob = ref->object;
1393         int ret;
1394
1395         mutex_init(&glob->device_list_mutex);
1396         spin_lock_init(&glob->lru_lock);
1397         glob->mem_glob = bo_ref->mem_glob;
1398         glob->dummy_read_page = alloc_page(__GFP_ZERO | GFP_DMA32);
1399
1400         if (unlikely(glob->dummy_read_page == NULL)) {
1401                 ret = -ENOMEM;
1402                 goto out_no_drp;
1403         }
1404
1405         INIT_LIST_HEAD(&glob->swap_lru);
1406         INIT_LIST_HEAD(&glob->device_list);
1407
1408         ttm_mem_init_shrink(&glob->shrink, ttm_bo_swapout);
1409         ret = ttm_mem_register_shrink(glob->mem_glob, &glob->shrink);
1410         if (unlikely(ret != 0)) {
1411                 printk(KERN_ERR TTM_PFX
1412                        "Could not register buffer object swapout.\n");
1413                 goto out_no_shrink;
1414         }
1415
1416         glob->ttm_bo_extra_size =
1417                 ttm_round_pot(sizeof(struct ttm_tt)) +
1418                 ttm_round_pot(sizeof(struct ttm_backend));
1419
1420         glob->ttm_bo_size = glob->ttm_bo_extra_size +
1421                 ttm_round_pot(sizeof(struct ttm_buffer_object));
1422
1423         atomic_set(&glob->bo_count, 0);
1424
1425         ret = kobject_init_and_add(
1426                 &glob->kobj, &ttm_bo_glob_kobj_type, ttm_get_kobj(), "buffer_objects");
1427         if (unlikely(ret != 0))
1428                 kobject_put(&glob->kobj);
1429         return ret;
1430 out_no_shrink:
1431         __free_page(glob->dummy_read_page);
1432 out_no_drp:
1433         kfree(glob);
1434         return ret;
1435 }
1436 EXPORT_SYMBOL(ttm_bo_global_init);
1437
1438
1439 int ttm_bo_device_release(struct ttm_bo_device *bdev)
1440 {
1441         int ret = 0;
1442         unsigned i = TTM_NUM_MEM_TYPES;
1443         struct ttm_mem_type_manager *man;
1444         struct ttm_bo_global *glob = bdev->glob;
1445
1446         while (i--) {
1447                 man = &bdev->man[i];
1448                 if (man->has_type) {
1449                         man->use_type = false;
1450                         if ((i != TTM_PL_SYSTEM) && ttm_bo_clean_mm(bdev, i)) {
1451                                 ret = -EBUSY;
1452                                 printk(KERN_ERR TTM_PFX
1453                                        "DRM memory manager type %d "
1454                                        "is not clean.\n", i);
1455                         }
1456                         man->has_type = false;
1457                 }
1458         }
1459
1460         mutex_lock(&glob->device_list_mutex);
1461         list_del(&bdev->device_list);
1462         mutex_unlock(&glob->device_list_mutex);
1463
1464         if (!cancel_delayed_work(&bdev->wq))
1465                 flush_scheduled_work();
1466
1467         while (ttm_bo_delayed_delete(bdev, true))
1468                 ;
1469
1470         spin_lock(&glob->lru_lock);
1471         if (list_empty(&bdev->ddestroy))
1472                 TTM_DEBUG("Delayed destroy list was clean\n");
1473
1474         if (list_empty(&bdev->man[0].lru))
1475                 TTM_DEBUG("Swap list was clean\n");
1476         spin_unlock(&glob->lru_lock);
1477
1478         BUG_ON(!drm_mm_clean(&bdev->addr_space_mm));
1479         write_lock(&bdev->vm_lock);
1480         drm_mm_takedown(&bdev->addr_space_mm);
1481         write_unlock(&bdev->vm_lock);
1482
1483         return ret;
1484 }
1485 EXPORT_SYMBOL(ttm_bo_device_release);
1486
1487 int ttm_bo_device_init(struct ttm_bo_device *bdev,
1488                        struct ttm_bo_global *glob,
1489                        struct ttm_bo_driver *driver,
1490                        uint64_t file_page_offset,
1491                        bool need_dma32)
1492 {
1493         int ret = -EINVAL;
1494
1495         rwlock_init(&bdev->vm_lock);
1496         bdev->driver = driver;
1497
1498         memset(bdev->man, 0, sizeof(bdev->man));
1499
1500         /*
1501          * Initialize the system memory buffer type.
1502          * Other types need to be driver / IOCTL initialized.
1503          */
1504         ret = ttm_bo_init_mm(bdev, TTM_PL_SYSTEM, 0);
1505         if (unlikely(ret != 0))
1506                 goto out_no_sys;
1507
1508         bdev->addr_space_rb = RB_ROOT;
1509         ret = drm_mm_init(&bdev->addr_space_mm, file_page_offset, 0x10000000);
1510         if (unlikely(ret != 0))
1511                 goto out_no_addr_mm;
1512
1513         INIT_DELAYED_WORK(&bdev->wq, ttm_bo_delayed_workqueue);
1514         bdev->nice_mode = true;
1515         INIT_LIST_HEAD(&bdev->ddestroy);
1516         bdev->dev_mapping = NULL;
1517         bdev->glob = glob;
1518         bdev->need_dma32 = need_dma32;
1519
1520         mutex_lock(&glob->device_list_mutex);
1521         list_add_tail(&bdev->device_list, &glob->device_list);
1522         mutex_unlock(&glob->device_list_mutex);
1523
1524         return 0;
1525 out_no_addr_mm:
1526         ttm_bo_clean_mm(bdev, 0);
1527 out_no_sys:
1528         return ret;
1529 }
1530 EXPORT_SYMBOL(ttm_bo_device_init);
1531
1532 /*
1533  * buffer object vm functions.
1534  */
1535
1536 bool ttm_mem_reg_is_pci(struct ttm_bo_device *bdev, struct ttm_mem_reg *mem)
1537 {
1538         struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
1539
1540         if (!(man->flags & TTM_MEMTYPE_FLAG_FIXED)) {
1541                 if (mem->mem_type == TTM_PL_SYSTEM)
1542                         return false;
1543
1544                 if (man->flags & TTM_MEMTYPE_FLAG_CMA)
1545                         return false;
1546
1547                 if (mem->placement & TTM_PL_FLAG_CACHED)
1548                         return false;
1549         }
1550         return true;
1551 }
1552
1553 void ttm_bo_unmap_virtual(struct ttm_buffer_object *bo)
1554 {
1555         struct ttm_bo_device *bdev = bo->bdev;
1556         loff_t offset = (loff_t) bo->addr_space_offset;
1557         loff_t holelen = ((loff_t) bo->mem.num_pages) << PAGE_SHIFT;
1558
1559         if (!bdev->dev_mapping)
1560                 return;
1561         unmap_mapping_range(bdev->dev_mapping, offset, holelen, 1);
1562         ttm_mem_io_free(bdev, &bo->mem);
1563 }
1564 EXPORT_SYMBOL(ttm_bo_unmap_virtual);
1565
1566 static void ttm_bo_vm_insert_rb(struct ttm_buffer_object *bo)
1567 {
1568         struct ttm_bo_device *bdev = bo->bdev;
1569         struct rb_node **cur = &bdev->addr_space_rb.rb_node;
1570         struct rb_node *parent = NULL;
1571         struct ttm_buffer_object *cur_bo;
1572         unsigned long offset = bo->vm_node->start;
1573         unsigned long cur_offset;
1574
1575         while (*cur) {
1576                 parent = *cur;
1577                 cur_bo = rb_entry(parent, struct ttm_buffer_object, vm_rb);
1578                 cur_offset = cur_bo->vm_node->start;
1579                 if (offset < cur_offset)
1580                         cur = &parent->rb_left;
1581                 else if (offset > cur_offset)
1582                         cur = &parent->rb_right;
1583                 else
1584                         BUG();
1585         }
1586
1587         rb_link_node(&bo->vm_rb, parent, cur);
1588         rb_insert_color(&bo->vm_rb, &bdev->addr_space_rb);
1589 }
1590
1591 /**
1592  * ttm_bo_setup_vm:
1593  *
1594  * @bo: the buffer to allocate address space for
1595  *
1596  * Allocate address space in the drm device so that applications
1597  * can mmap the buffer and access the contents. This only
1598  * applies to ttm_bo_type_device objects as others are not
1599  * placed in the drm device address space.
1600  */
1601
1602 static int ttm_bo_setup_vm(struct ttm_buffer_object *bo)
1603 {
1604         struct ttm_bo_device *bdev = bo->bdev;
1605         int ret;
1606
1607 retry_pre_get:
1608         ret = drm_mm_pre_get(&bdev->addr_space_mm);
1609         if (unlikely(ret != 0))
1610                 return ret;
1611
1612         write_lock(&bdev->vm_lock);
1613         bo->vm_node = drm_mm_search_free(&bdev->addr_space_mm,
1614                                          bo->mem.num_pages, 0, 0);
1615
1616         if (unlikely(bo->vm_node == NULL)) {
1617                 ret = -ENOMEM;
1618                 goto out_unlock;
1619         }
1620
1621         bo->vm_node = drm_mm_get_block_atomic(bo->vm_node,
1622                                               bo->mem.num_pages, 0);
1623
1624         if (unlikely(bo->vm_node == NULL)) {
1625                 write_unlock(&bdev->vm_lock);
1626                 goto retry_pre_get;
1627         }
1628
1629         ttm_bo_vm_insert_rb(bo);
1630         write_unlock(&bdev->vm_lock);
1631         bo->addr_space_offset = ((uint64_t) bo->vm_node->start) << PAGE_SHIFT;
1632
1633         return 0;
1634 out_unlock:
1635         write_unlock(&bdev->vm_lock);
1636         return ret;
1637 }
1638
1639 int ttm_bo_wait(struct ttm_buffer_object *bo,
1640                 bool lazy, bool interruptible, bool no_wait)
1641 {
1642         struct ttm_bo_driver *driver = bo->bdev->driver;
1643         void *sync_obj;
1644         void *sync_obj_arg;
1645         int ret = 0;
1646
1647         if (likely(bo->sync_obj == NULL))
1648                 return 0;
1649
1650         while (bo->sync_obj) {
1651
1652                 if (driver->sync_obj_signaled(bo->sync_obj, bo->sync_obj_arg)) {
1653                         void *tmp_obj = bo->sync_obj;
1654                         bo->sync_obj = NULL;
1655                         clear_bit(TTM_BO_PRIV_FLAG_MOVING, &bo->priv_flags);
1656                         spin_unlock(&bo->lock);
1657                         driver->sync_obj_unref(&tmp_obj);
1658                         spin_lock(&bo->lock);
1659                         continue;
1660                 }
1661
1662                 if (no_wait)
1663                         return -EBUSY;
1664
1665                 sync_obj = driver->sync_obj_ref(bo->sync_obj);
1666                 sync_obj_arg = bo->sync_obj_arg;
1667                 spin_unlock(&bo->lock);
1668                 ret = driver->sync_obj_wait(sync_obj, sync_obj_arg,
1669                                             lazy, interruptible);
1670                 if (unlikely(ret != 0)) {
1671                         driver->sync_obj_unref(&sync_obj);
1672                         spin_lock(&bo->lock);
1673                         return ret;
1674                 }
1675                 spin_lock(&bo->lock);
1676                 if (likely(bo->sync_obj == sync_obj &&
1677                            bo->sync_obj_arg == sync_obj_arg)) {
1678                         void *tmp_obj = bo->sync_obj;
1679                         bo->sync_obj = NULL;
1680                         clear_bit(TTM_BO_PRIV_FLAG_MOVING,
1681                                   &bo->priv_flags);
1682                         spin_unlock(&bo->lock);
1683                         driver->sync_obj_unref(&sync_obj);
1684                         driver->sync_obj_unref(&tmp_obj);
1685                         spin_lock(&bo->lock);
1686                 } else {
1687                         spin_unlock(&bo->lock);
1688                         driver->sync_obj_unref(&sync_obj);
1689                         spin_lock(&bo->lock);
1690                 }
1691         }
1692         return 0;
1693 }
1694 EXPORT_SYMBOL(ttm_bo_wait);
1695
1696 int ttm_bo_synccpu_write_grab(struct ttm_buffer_object *bo, bool no_wait)
1697 {
1698         int ret = 0;
1699
1700         /*
1701          * Using ttm_bo_reserve makes sure the lru lists are updated.
1702          */
1703
1704         ret = ttm_bo_reserve(bo, true, no_wait, false, 0);
1705         if (unlikely(ret != 0))
1706                 return ret;
1707         spin_lock(&bo->lock);
1708         ret = ttm_bo_wait(bo, false, true, no_wait);
1709         spin_unlock(&bo->lock);
1710         if (likely(ret == 0))
1711                 atomic_inc(&bo->cpu_writers);
1712         ttm_bo_unreserve(bo);
1713         return ret;
1714 }
1715 EXPORT_SYMBOL(ttm_bo_synccpu_write_grab);
1716
1717 void ttm_bo_synccpu_write_release(struct ttm_buffer_object *bo)
1718 {
1719         if (atomic_dec_and_test(&bo->cpu_writers))
1720                 wake_up_all(&bo->event_queue);
1721 }
1722 EXPORT_SYMBOL(ttm_bo_synccpu_write_release);
1723
1724 /**
1725  * A buffer object shrink method that tries to swap out the first
1726  * buffer object on the bo_global::swap_lru list.
1727  */
1728
1729 static int ttm_bo_swapout(struct ttm_mem_shrink *shrink)
1730 {
1731         struct ttm_bo_global *glob =
1732             container_of(shrink, struct ttm_bo_global, shrink);
1733         struct ttm_buffer_object *bo;
1734         int ret = -EBUSY;
1735         int put_count;
1736         uint32_t swap_placement = (TTM_PL_FLAG_CACHED | TTM_PL_FLAG_SYSTEM);
1737
1738         spin_lock(&glob->lru_lock);
1739         while (ret == -EBUSY) {
1740                 if (unlikely(list_empty(&glob->swap_lru))) {
1741                         spin_unlock(&glob->lru_lock);
1742                         return -EBUSY;
1743                 }
1744
1745                 bo = list_first_entry(&glob->swap_lru,
1746                                       struct ttm_buffer_object, swap);
1747                 kref_get(&bo->list_kref);
1748
1749                 if (!list_empty(&bo->ddestroy)) {
1750                         spin_unlock(&glob->lru_lock);
1751                         (void) ttm_bo_cleanup_refs(bo, false, false, false);
1752                         kref_put(&bo->list_kref, ttm_bo_release_list);
1753                         continue;
1754                 }
1755
1756                 /**
1757                  * Reserve buffer. Since we unlock while sleeping, we need
1758                  * to re-check that nobody removed us from the swap-list while
1759                  * we slept.
1760                  */
1761
1762                 ret = ttm_bo_reserve_locked(bo, false, true, false, 0);
1763                 if (unlikely(ret == -EBUSY)) {
1764                         spin_unlock(&glob->lru_lock);
1765                         ttm_bo_wait_unreserved(bo, false);
1766                         kref_put(&bo->list_kref, ttm_bo_release_list);
1767                         spin_lock(&glob->lru_lock);
1768                 }
1769         }
1770
1771         BUG_ON(ret != 0);
1772         put_count = ttm_bo_del_from_lru(bo);
1773         spin_unlock(&glob->lru_lock);
1774
1775         while (put_count--)
1776                 kref_put(&bo->list_kref, ttm_bo_ref_bug);
1777
1778         /**
1779          * Wait for GPU, then move to system cached.
1780          */
1781
1782         spin_lock(&bo->lock);
1783         ret = ttm_bo_wait(bo, false, false, false);
1784         spin_unlock(&bo->lock);
1785
1786         if (unlikely(ret != 0))
1787                 goto out;
1788
1789         if ((bo->mem.placement & swap_placement) != swap_placement) {
1790                 struct ttm_mem_reg evict_mem;
1791
1792                 evict_mem = bo->mem;
1793                 evict_mem.mm_node = NULL;
1794                 evict_mem.placement = TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED;
1795                 evict_mem.mem_type = TTM_PL_SYSTEM;
1796
1797                 ret = ttm_bo_handle_move_mem(bo, &evict_mem, true,
1798                                              false, false, false);
1799                 if (unlikely(ret != 0))
1800                         goto out;
1801         }
1802
1803         ttm_bo_unmap_virtual(bo);
1804
1805         /**
1806          * Swap out. Buffer will be swapped in again as soon as
1807          * anyone tries to access a ttm page.
1808          */
1809
1810         if (bo->bdev->driver->swap_notify)
1811                 bo->bdev->driver->swap_notify(bo);
1812
1813         ret = ttm_tt_swapout(bo->ttm, bo->persistant_swap_storage);
1814 out:
1815
1816         /**
1817          *
1818          * Unreserve without putting on LRU to avoid swapping out an
1819          * already swapped buffer.
1820          */
1821
1822         atomic_set(&bo->reserved, 0);
1823         wake_up_all(&bo->event_queue);
1824         kref_put(&bo->list_kref, ttm_bo_release_list);
1825         return ret;
1826 }
1827
1828 void ttm_bo_swapout_all(struct ttm_bo_device *bdev)
1829 {
1830         while (ttm_bo_swapout(&bdev->glob->shrink) == 0)
1831                 ;
1832 }
1833 EXPORT_SYMBOL(ttm_bo_swapout_all);