drivers/gpu/drm/ttm/ttm_bo.c

   1 /**************************************************************************
   2  *
   3  * Copyright (c) 2006-2009 VMware, Inc., Palo Alto, CA., USA
   4  * All Rights Reserved.
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * copy of this software and associated documentation files (the
   8  * "Software"), to deal in the Software without restriction, including
   9  * without limitation the rights to use, copy, modify, merge, publish,
  10  * distribute, sub license, and/or sell copies of the Software, and to
  11  * permit persons to whom the Software is furnished to do so, subject to
  12  * the following conditions:
  13  *
  14  * The above copyright notice and this permission notice (including the
  15  * next paragraph) shall be included in all copies or substantial portions
  16  * of the Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  19  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  20  * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
  21  * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
  22  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
  23  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
  24  * USE OR OTHER DEALINGS IN THE SOFTWARE.
  25  *
  26  **************************************************************************/
  27 /*
  28  * Authors: Thomas Hellstrom <thellstrom-at-vmware-dot-com>
  29  */
  30 /* Notes:
  31  *
  32  * We store bo pointer in drm_mm_node struct so we know which bo own a
  33  * specific node. There is no protection on the pointer, thus to make
  34  * sure things don't go berserk you have to access this pointer while
  35  * holding the global lru lock and make sure anytime you free a node you
  36  * reset the pointer to NULL.
  37  */
  38
  39 #include "ttm/ttm_module.h"
  40 #include "ttm/ttm_bo_driver.h"
  41 #include "ttm/ttm_placement.h"
  42 #include <linux/jiffies.h>
  43 #include <linux/slab.h>
  44 #include <linux/sched.h>
  45 #include <linux/mm.h>
  46 #include <linux/file.h>
  47 #include <linux/module.h>
  48
  49 #define TTM_ASSERT_LOCKED(param)
  50 #define TTM_DEBUG(fmt, arg...)
  51 #define TTM_BO_HASH_ORDER 13
  52
  53 static int ttm_bo_setup_vm(struct ttm_buffer_object *bo);
  54 static int ttm_bo_swapout(struct ttm_mem_shrink *shrink);
  55 static void ttm_bo_global_kobj_release(struct kobject *kobj);
  56
  57 static struct attribute ttm_bo_count = {
  58         .name = "bo_count",
  59         .mode = S_IRUGO
  60 };
  61
  62 static inline int ttm_mem_type_from_flags(uint32_t flags, uint32_t *mem_type)
  63 {
  64         int i;
  65
  66         for (i = 0; i <= TTM_PL_PRIV5; i++)
  67                 if (flags & (1 << i)) {
  68                         *mem_type = i;
  69                         return 0;
  70                 }
  71         return -EINVAL;
  72 }
  73
  74 static void ttm_mem_type_debug(struct ttm_bo_device *bdev, int mem_type)
  75 {
  76         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
  77
  78         printk(KERN_ERR TTM_PFX "    has_type: %d\n", man->has_type);
  79         printk(KERN_ERR TTM_PFX "    use_type: %d\n", man->use_type);
  80         printk(KERN_ERR TTM_PFX "    flags: 0x%08X\n", man->flags);
  81         printk(KERN_ERR TTM_PFX "    gpu_offset: 0x%08lX\n", man->gpu_offset);
  82         printk(KERN_ERR TTM_PFX "    size: %llu\n", man->size);
  83         printk(KERN_ERR TTM_PFX "    available_caching: 0x%08X\n",
  84                 man->available_caching);
  85         printk(KERN_ERR TTM_PFX "    default_caching: 0x%08X\n",
  86                 man->default_caching);
  87         if (mem_type != TTM_PL_SYSTEM) {
  88                 spin_lock(&bdev->glob->lru_lock);
  89                 drm_mm_debug_table(&man->manager, TTM_PFX);
  90                 spin_unlock(&bdev->glob->lru_lock);
  91         }
  92 }
  93
  94 static void ttm_bo_mem_space_debug(struct ttm_buffer_object *bo,
  95                                         struct ttm_placement *placement)
  96 {
  97         int i, ret, mem_type;
  98
  99         printk(KERN_ERR TTM_PFX "No space for %p (%lu pages, %luK, %luM)\n",
 100                 bo, bo->mem.num_pages, bo->mem.size >> 10,
 101                 bo->mem.size >> 20);
 102         for (i = 0; i < placement->num_placement; i++) {
 103                 ret = ttm_mem_type_from_flags(placement->placement[i],
 104                                                 &mem_type);
 105                 if (ret)
 106                         return;
 107                 printk(KERN_ERR TTM_PFX "  placement[%d]=0x%08X (%d)\n",
 108                         i, placement->placement[i], mem_type);
 109                 ttm_mem_type_debug(bo->bdev, mem_type);
 110         }
 111 }
 112
 113 static ssize_t ttm_bo_global_show(struct kobject *kobj,
 114                                   struct attribute *attr,
 115                                   char *buffer)
 116 {
 117         struct ttm_bo_global *glob =
 118                 container_of(kobj, struct ttm_bo_global, kobj);
 119
 120         return snprintf(buffer, PAGE_SIZE, "%lu\n",
 121                         (unsigned long) atomic_read(&glob->bo_count));
 122 }
 123
 124 static struct attribute *ttm_bo_global_attrs[] = {
 125         &ttm_bo_count,
 126         NULL
 127 };
 128
 129 static const struct sysfs_ops ttm_bo_global_ops = {
 130         .show = &ttm_bo_global_show
 131 };
 132
 133 static struct kobj_type ttm_bo_glob_kobj_type  = {
 134         .release = &ttm_bo_global_kobj_release,
 135         .sysfs_ops = &ttm_bo_global_ops,
 136         .default_attrs = ttm_bo_global_attrs
 137 };
 138
 139
 140 static inline uint32_t ttm_bo_type_flags(unsigned type)
 141 {
 142         return 1 << (type);
 143 }
 144
 145 static void ttm_bo_release_list(struct kref *list_kref)
 146 {
 147         struct ttm_buffer_object *bo =
 148             container_of(list_kref, struct ttm_buffer_object, list_kref);
 149         struct ttm_bo_device *bdev = bo->bdev;
 150
 151         BUG_ON(atomic_read(&bo->list_kref.refcount));
 152         BUG_ON(atomic_read(&bo->kref.refcount));
 153         BUG_ON(atomic_read(&bo->cpu_writers));
 154         BUG_ON(bo->sync_obj != NULL);
 155         BUG_ON(bo->mem.mm_node != NULL);
 156         BUG_ON(!list_empty(&bo->lru));
 157         BUG_ON(!list_empty(&bo->ddestroy));
 158
 159         if (bo->ttm)
 160                 ttm_tt_destroy(bo->ttm);
 161         atomic_dec(&bo->glob->bo_count);
 162         if (bo->destroy)
 163                 bo->destroy(bo);
 164         else {
 165                 ttm_mem_global_free(bdev->glob->mem_glob, bo->acc_size);
 166                 kfree(bo);
 167         }
 168 }
 169
 170 int ttm_bo_wait_unreserved(struct ttm_buffer_object *bo, bool interruptible)
 171 {
 172
 173         if (interruptible) {
 174                 int ret = 0;
 175
 176                 ret = wait_event_interruptible(bo->event_queue,
 177                                                atomic_read(&bo->reserved) == 0);
 178                 if (unlikely(ret != 0))
 179                         return ret;
 180         } else {
 181                 wait_event(bo->event_queue, atomic_read(&bo->reserved) == 0);
 182         }
 183         return 0;
 184 }
 185 EXPORT_SYMBOL(ttm_bo_wait_unreserved);
 186
 187 static void ttm_bo_add_to_lru(struct ttm_buffer_object *bo)
 188 {
 189         struct ttm_bo_device *bdev = bo->bdev;
 190         struct ttm_mem_type_manager *man;
 191
 192         BUG_ON(!atomic_read(&bo->reserved));
 193
 194         if (!(bo->mem.placement & TTM_PL_FLAG_NO_EVICT)) {
 195
 196                 BUG_ON(!list_empty(&bo->lru));
 197
 198                 man = &bdev->man[bo->mem.mem_type];
 199                 list_add_tail(&bo->lru, &man->lru);
 200                 kref_get(&bo->list_kref);
 201
 202                 if (bo->ttm != NULL) {
 203                         list_add_tail(&bo->swap, &bo->glob->swap_lru);
 204                         kref_get(&bo->list_kref);
 205                 }
 206         }
 207 }
 208
 209 /**
 210  * Call with the lru_lock held.
 211  */
 212
 213 static int ttm_bo_del_from_lru(struct ttm_buffer_object *bo)
 214 {
 215         int put_count = 0;
 216
 217         if (!list_empty(&bo->swap)) {
 218                 list_del_init(&bo->swap);
 219                 ++put_count;
 220         }
 221         if (!list_empty(&bo->lru)) {
 222                 list_del_init(&bo->lru);
 223                 ++put_count;
 224         }
 225
 226         /*
 227          * TODO: Add a driver hook to delete from
 228          * driver-specific LRU's here.
 229          */
 230
 231         return put_count;
 232 }
 233
 234 int ttm_bo_reserve_locked(struct ttm_buffer_object *bo,
 235                           bool interruptible,
 236                           bool no_wait, bool use_sequence, uint32_t sequence)
 237 {
 238         struct ttm_bo_global *glob = bo->glob;
 239         int ret;
 240
 241         while (unlikely(atomic_cmpxchg(&bo->reserved, 0, 1) != 0)) {
 242                 if (use_sequence && bo->seq_valid &&
 243                         (sequence - bo->val_seq < (1 << 31))) {
 244                         return -EAGAIN;
 245                 }
 246
 247                 if (no_wait)
 248                         return -EBUSY;
 249
 250                 spin_unlock(&glob->lru_lock);
 251                 ret = ttm_bo_wait_unreserved(bo, interruptible);
 252                 spin_lock(&glob->lru_lock);
 253
 254                 if (unlikely(ret))
 255                         return ret;
 256         }
 257
 258         if (use_sequence) {
 259                 bo->val_seq = sequence;
 260                 bo->seq_valid = true;
 261         } else {
 262                 bo->seq_valid = false;
 263         }
 264
 265         return 0;
 266 }
 267 EXPORT_SYMBOL(ttm_bo_reserve);
 268
 269 static void ttm_bo_ref_bug(struct kref *list_kref)
 270 {
 271         BUG();
 272 }
 273
 274 int ttm_bo_reserve(struct ttm_buffer_object *bo,
 275                    bool interruptible,
 276                    bool no_wait, bool use_sequence, uint32_t sequence)
 277 {
 278         struct ttm_bo_global *glob = bo->glob;
 279         int put_count = 0;
 280         int ret;
 281
 282         spin_lock(&glob->lru_lock);
 283         ret = ttm_bo_reserve_locked(bo, interruptible, no_wait, use_sequence,
 284                                     sequence);
 285         if (likely(ret == 0))
 286                 put_count = ttm_bo_del_from_lru(bo);
 287         spin_unlock(&glob->lru_lock);
 288
 289         while (put_count--)
 290                 kref_put(&bo->list_kref, ttm_bo_ref_bug);
 291
 292         return ret;
 293 }
 294
 295 void ttm_bo_unreserve(struct ttm_buffer_object *bo)
 296 {
 297         struct ttm_bo_global *glob = bo->glob;
 298
 299         spin_lock(&glob->lru_lock);
 300         ttm_bo_add_to_lru(bo);
 301         atomic_set(&bo->reserved, 0);
 302         wake_up_all(&bo->event_queue);
 303         spin_unlock(&glob->lru_lock);
 304 }
 305 EXPORT_SYMBOL(ttm_bo_unreserve);
 306
 307 /*
 308  * Call bo->mutex locked.
 309  */
 310 static int ttm_bo_add_ttm(struct ttm_buffer_object *bo, bool zero_alloc)
 311 {
 312         struct ttm_bo_device *bdev = bo->bdev;
 313         struct ttm_bo_global *glob = bo->glob;
 314         int ret = 0;
 315         uint32_t page_flags = 0;
 316
 317         TTM_ASSERT_LOCKED(&bo->mutex);
 318         bo->ttm = NULL;
 319
 320         if (bdev->need_dma32)
 321                 page_flags |= TTM_PAGE_FLAG_DMA32;
 322
 323         switch (bo->type) {
 324         case ttm_bo_type_device:
 325                 if (zero_alloc)
 326                         page_flags |= TTM_PAGE_FLAG_ZERO_ALLOC;
 327         case ttm_bo_type_kernel:
 328                 bo->ttm = ttm_tt_create(bdev, bo->num_pages << PAGE_SHIFT,
 329                                         page_flags, glob->dummy_read_page);
 330                 if (unlikely(bo->ttm == NULL))
 331                         ret = -ENOMEM;
 332                 break;
 333         case ttm_bo_type_user:
 334                 bo->ttm = ttm_tt_create(bdev, bo->num_pages << PAGE_SHIFT,
 335                                         page_flags | TTM_PAGE_FLAG_USER,
 336                                         glob->dummy_read_page);
 337                 if (unlikely(bo->ttm == NULL)) {
 338                         ret = -ENOMEM;
 339                         break;
 340                 }
 341
 342                 ret = ttm_tt_set_user(bo->ttm, current,
 343                                       bo->buffer_start, bo->num_pages);
 344                 if (unlikely(ret != 0))
 345                         ttm_tt_destroy(bo->ttm);
 346                 break;
 347         default:
 348                 printk(KERN_ERR TTM_PFX "Illegal buffer object type\n");
 349                 ret = -EINVAL;
 350                 break;
 351         }
 352
 353         return ret;
 354 }
 355
 356 static int ttm_bo_handle_move_mem(struct ttm_buffer_object *bo,
 357                                   struct ttm_mem_reg *mem,
 358                                   bool evict, bool interruptible,
 359                                   bool no_wait_reserve, bool no_wait_gpu)
 360 {
 361         struct ttm_bo_device *bdev = bo->bdev;
 362         bool old_is_pci = ttm_mem_reg_is_pci(bdev, &bo->mem);
 363         bool new_is_pci = ttm_mem_reg_is_pci(bdev, mem);
 364         struct ttm_mem_type_manager *old_man = &bdev->man[bo->mem.mem_type];
 365         struct ttm_mem_type_manager *new_man = &bdev->man[mem->mem_type];
 366         int ret = 0;
 367
 368         if (old_is_pci || new_is_pci ||
 369             ((mem->placement & bo->mem.placement & TTM_PL_MASK_CACHING) == 0))
 370                 ttm_bo_unmap_virtual(bo);
 371
 372         /*
 373          * Create and bind a ttm if required.
 374          */
 375
 376         if (!(new_man->flags & TTM_MEMTYPE_FLAG_FIXED) && (bo->ttm == NULL)) {
 377                 ret = ttm_bo_add_ttm(bo, false);
 378                 if (ret)
 379                         goto out_err;
 380
 381                 ret = ttm_tt_set_placement_caching(bo->ttm, mem->placement);
 382                 if (ret)
 383                         goto out_err;
 384
 385                 if (mem->mem_type != TTM_PL_SYSTEM) {
 386                         ret = ttm_tt_bind(bo->ttm, mem);
 387                         if (ret)
 388                                 goto out_err;
 389                 }
 390
 391                 if (bo->mem.mem_type == TTM_PL_SYSTEM) {
 392                         bo->mem = *mem;
 393                         mem->mm_node = NULL;
 394                         goto moved;
 395                 }
 396
 397         }
 398
 399         if (bdev->driver->move_notify)
 400                 bdev->driver->move_notify(bo, mem);
 401
 402         if (!(old_man->flags & TTM_MEMTYPE_FLAG_FIXED) &&
 403             !(new_man->flags & TTM_MEMTYPE_FLAG_FIXED))
 404                 ret = ttm_bo_move_ttm(bo, evict, no_wait_reserve, no_wait_gpu, mem);
 405         else if (bdev->driver->move)
 406                 ret = bdev->driver->move(bo, evict, interruptible,
 407                                          no_wait_reserve, no_wait_gpu, mem);
 408         else
 409                 ret = ttm_bo_move_memcpy(bo, evict, no_wait_reserve, no_wait_gpu, mem);
 410
 411         if (ret)
 412                 goto out_err;
 413
 414 moved:
 415         if (bo->evicted) {
 416                 ret = bdev->driver->invalidate_caches(bdev, bo->mem.placement);
 417                 if (ret)
 418                         printk(KERN_ERR TTM_PFX "Can not flush read caches\n");
 419                 bo->evicted = false;
 420         }
 421
 422         if (bo->mem.mm_node) {
 423                 spin_lock(&bo->lock);
 424                 bo->offset = (bo->mem.mm_node->start << PAGE_SHIFT) +
 425                     bdev->man[bo->mem.mem_type].gpu_offset;
 426                 bo->cur_placement = bo->mem.placement;
 427                 spin_unlock(&bo->lock);
 428         } else
 429                 bo->offset = 0;
 430
 431         return 0;
 432
 433 out_err:
 434         new_man = &bdev->man[bo->mem.mem_type];
 435         if ((new_man->flags & TTM_MEMTYPE_FLAG_FIXED) && bo->ttm) {
 436                 ttm_tt_unbind(bo->ttm);
 437                 ttm_tt_destroy(bo->ttm);
 438                 bo->ttm = NULL;
 439         }
 440
 441         return ret;
 442 }
 443
 444 /**
 445  * If bo idle, remove from delayed- and lru lists, and unref.
 446  * If not idle, and already on delayed list, do nothing.
 447  * If not idle, and not on delayed list, put on delayed list,
 448  *   up the list_kref and schedule a delayed list check.
 449  */
 450
 451 static int ttm_bo_cleanup_refs(struct ttm_buffer_object *bo, bool remove_all)
 452 {
 453         struct ttm_bo_device *bdev = bo->bdev;
 454         struct ttm_bo_global *glob = bo->glob;
 455         struct ttm_bo_driver *driver = bdev->driver;
 456         int ret;
 457
 458         spin_lock(&bo->lock);
 459         (void) ttm_bo_wait(bo, false, false, !remove_all);
 460
 461         if (!bo->sync_obj) {
 462                 int put_count;
 463
 464                 spin_unlock(&bo->lock);
 465
 466                 spin_lock(&glob->lru_lock);
 467                 put_count = ttm_bo_del_from_lru(bo);
 468
 469                 ret = ttm_bo_reserve_locked(bo, false, false, false, 0);
 470                 BUG_ON(ret);
 471                 if (bo->ttm)
 472                         ttm_tt_unbind(bo->ttm);
 473
 474                 if (!list_empty(&bo->ddestroy)) {
 475                         list_del_init(&bo->ddestroy);
 476                         ++put_count;
 477                 }
 478                 if (bo->mem.mm_node) {
 479                         bo->mem.mm_node->private = NULL;
 480                         drm_mm_put_block(bo->mem.mm_node);
 481                         bo->mem.mm_node = NULL;
 482                 }
 483                 spin_unlock(&glob->lru_lock);
 484
 485                 atomic_set(&bo->reserved, 0);
 486
 487                 while (put_count--)
 488                         kref_put(&bo->list_kref, ttm_bo_ref_bug);
 489
 490                 return 0;
 491         }
 492
 493         spin_lock(&glob->lru_lock);
 494         if (list_empty(&bo->ddestroy)) {
 495                 void *sync_obj = bo->sync_obj;
 496                 void *sync_obj_arg = bo->sync_obj_arg;
 497
 498                 kref_get(&bo->list_kref);
 499                 list_add_tail(&bo->ddestroy, &bdev->ddestroy);
 500                 spin_unlock(&glob->lru_lock);
 501                 spin_unlock(&bo->lock);
 502
 503                 if (sync_obj)
 504                         driver->sync_obj_flush(sync_obj, sync_obj_arg);
 505                 schedule_delayed_work(&bdev->wq,
 506                                       ((HZ / 100) < 1) ? 1 : HZ / 100);
 507                 ret = 0;
 508
 509         } else {
 510                 spin_unlock(&glob->lru_lock);
 511                 spin_unlock(&bo->lock);
 512                 ret = -EBUSY;
 513         }
 514
 515         return ret;
 516 }
 517
 518 /**
 519  * Traverse the delayed list, and call ttm_bo_cleanup_refs on all
 520  * encountered buffers.
 521  */
 522
 523 static int ttm_bo_delayed_delete(struct ttm_bo_device *bdev, bool remove_all)
 524 {
 525         struct ttm_bo_global *glob = bdev->glob;
 526         struct ttm_buffer_object *entry = NULL;
 527         int ret = 0;
 528
 529         spin_lock(&glob->lru_lock);
 530         if (list_empty(&bdev->ddestroy))
 531                 goto out_unlock;
 532
 533         entry = list_first_entry(&bdev->ddestroy,
 534                 struct ttm_buffer_object, ddestroy);
 535         kref_get(&entry->list_kref);
 536
 537         for (;;) {
 538                 struct ttm_buffer_object *nentry = NULL;
 539
 540                 if (entry->ddestroy.next != &bdev->ddestroy) {
 541                         nentry = list_first_entry(&entry->ddestroy,
 542                                 struct ttm_buffer_object, ddestroy);
 543                         kref_get(&nentry->list_kref);
 544                 }
 545
 546                 spin_unlock(&glob->lru_lock);
 547                 ret = ttm_bo_cleanup_refs(entry, remove_all);
 548                 kref_put(&entry->list_kref, ttm_bo_release_list);
 549                 entry = nentry;
 550
 551                 if (ret || !entry)
 552                         goto out;
 553
 554                 spin_lock(&glob->lru_lock);
 555                 if (list_empty(&entry->ddestroy))
 556                         break;
 557         }
 558
 559 out_unlock:
 560         spin_unlock(&glob->lru_lock);
 561 out:
 562         if (entry)
 563                 kref_put(&entry->list_kref, ttm_bo_release_list);
 564         return ret;
 565 }
 566
 567 static void ttm_bo_delayed_workqueue(struct work_struct *work)
 568 {
 569         struct ttm_bo_device *bdev =
 570             container_of(work, struct ttm_bo_device, wq.work);
 571
 572         if (ttm_bo_delayed_delete(bdev, false)) {
 573                 schedule_delayed_work(&bdev->wq,
 574                                       ((HZ / 100) < 1) ? 1 : HZ / 100);
 575         }
 576 }
 577
 578 static void ttm_bo_release(struct kref *kref)
 579 {
 580         struct ttm_buffer_object *bo =
 581             container_of(kref, struct ttm_buffer_object, kref);
 582         struct ttm_bo_device *bdev = bo->bdev;
 583
 584         if (likely(bo->vm_node != NULL)) {
 585                 rb_erase(&bo->vm_rb, &bdev->addr_space_rb);
 586                 drm_mm_put_block(bo->vm_node);
 587                 bo->vm_node = NULL;
 588         }
 589         write_unlock(&bdev->vm_lock);
 590         ttm_bo_cleanup_refs(bo, false);
 591         kref_put(&bo->list_kref, ttm_bo_release_list);
 592         write_lock(&bdev->vm_lock);
 593 }
 594
 595 void ttm_bo_unref(struct ttm_buffer_object **p_bo)
 596 {
 597         struct ttm_buffer_object *bo = *p_bo;
 598         struct ttm_bo_device *bdev = bo->bdev;
 599
 600         *p_bo = NULL;
 601         write_lock(&bdev->vm_lock);
 602         kref_put(&bo->kref, ttm_bo_release);
 603         write_unlock(&bdev->vm_lock);
 604 }
 605 EXPORT_SYMBOL(ttm_bo_unref);
 606
 607 int ttm_bo_lock_delayed_workqueue(struct ttm_bo_device *bdev)
 608 {
 609         return cancel_delayed_work_sync(&bdev->wq);
 610 }
 611 EXPORT_SYMBOL(ttm_bo_lock_delayed_workqueue);
 612
 613 void ttm_bo_unlock_delayed_workqueue(struct ttm_bo_device *bdev, int resched)
 614 {
 615         if (resched)
 616                 schedule_delayed_work(&bdev->wq,
 617                                       ((HZ / 100) < 1) ? 1 : HZ / 100);
 618 }
 619 EXPORT_SYMBOL(ttm_bo_unlock_delayed_workqueue);
 620
 621 static int ttm_bo_evict(struct ttm_buffer_object *bo, bool interruptible,
 622                         bool no_wait_reserve, bool no_wait_gpu)
 623 {
 624         struct ttm_bo_device *bdev = bo->bdev;
 625         struct ttm_bo_global *glob = bo->glob;
 626         struct ttm_mem_reg evict_mem;
 627         struct ttm_placement placement;
 628         int ret = 0;
 629
 630         spin_lock(&bo->lock);
 631         ret = ttm_bo_wait(bo, false, interruptible, no_wait_gpu);
 632         spin_unlock(&bo->lock);
 633
 634         if (unlikely(ret != 0)) {
 635                 if (ret != -ERESTARTSYS) {
 636                         printk(KERN_ERR TTM_PFX
 637                                "Failed to expire sync object before "
 638                                "buffer eviction.\n");
 639                 }
 640                 goto out;
 641         }
 642
 643         BUG_ON(!atomic_read(&bo->reserved));
 644
 645         evict_mem = bo->mem;
 646         evict_mem.mm_node = NULL;
 647         evict_mem.bus.io_reserved = false;
 648
 649         placement.fpfn = 0;
 650         placement.lpfn = 0;
 651         placement.num_placement = 0;
 652         placement.num_busy_placement = 0;
 653         bdev->driver->evict_flags(bo, &placement);
 654         ret = ttm_bo_mem_space(bo, &placement, &evict_mem, interruptible,
 655                                 no_wait_reserve, no_wait_gpu);
 656         if (ret) {
 657                 if (ret != -ERESTARTSYS) {
 658                         printk(KERN_ERR TTM_PFX
 659                                "Failed to find memory space for "
 660                                "buffer 0x%p eviction.\n", bo);
 661                         ttm_bo_mem_space_debug(bo, &placement);
 662                 }
 663                 goto out;
 664         }
 665
 666         ret = ttm_bo_handle_move_mem(bo, &evict_mem, true, interruptible,
 667                                      no_wait_reserve, no_wait_gpu);
 668         if (ret) {
 669                 if (ret != -ERESTARTSYS)
 670                         printk(KERN_ERR TTM_PFX "Buffer eviction failed\n");
 671                 spin_lock(&glob->lru_lock);
 672                 if (evict_mem.mm_node) {
 673                         evict_mem.mm_node->private = NULL;
 674                         drm_mm_put_block(evict_mem.mm_node);
 675                         evict_mem.mm_node = NULL;
 676                 }
 677                 spin_unlock(&glob->lru_lock);
 678                 goto out;
 679         }
 680         bo->evicted = true;
 681 out:
 682         return ret;
 683 }
 684
 685 static int ttm_mem_evict_first(struct ttm_bo_device *bdev,
 686                                 uint32_t mem_type,
 687                                 bool interruptible, bool no_wait_reserve,
 688                                 bool no_wait_gpu)
 689 {
 690         struct ttm_bo_global *glob = bdev->glob;
 691         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
 692         struct ttm_buffer_object *bo;
 693         int ret, put_count = 0;
 694
 695 retry:
 696         spin_lock(&glob->lru_lock);
 697         if (list_empty(&man->lru)) {
 698                 spin_unlock(&glob->lru_lock);
 699                 return -EBUSY;
 700         }
 701
 702         bo = list_first_entry(&man->lru, struct ttm_buffer_object, lru);
 703         kref_get(&bo->list_kref);
 704
 705         ret = ttm_bo_reserve_locked(bo, false, no_wait_reserve, false, 0);
 706
 707         if (unlikely(ret == -EBUSY)) {
 708                 spin_unlock(&glob->lru_lock);
 709                 if (likely(!no_wait_gpu))
 710                         ret = ttm_bo_wait_unreserved(bo, interruptible);
 711
 712                 kref_put(&bo->list_kref, ttm_bo_release_list);
 713
 714                 /**
 715                  * We *need* to retry after releasing the lru lock.
 716                  */
 717
 718                 if (unlikely(ret != 0))
 719                         return ret;
 720                 goto retry;
 721         }
 722
 723         put_count = ttm_bo_del_from_lru(bo);
 724         spin_unlock(&glob->lru_lock);
 725
 726         BUG_ON(ret != 0);
 727
 728         while (put_count--)
 729                 kref_put(&bo->list_kref, ttm_bo_ref_bug);
 730
 731         ret = ttm_bo_evict(bo, interruptible, no_wait_reserve, no_wait_gpu);
 732         ttm_bo_unreserve(bo);
 733
 734         kref_put(&bo->list_kref, ttm_bo_release_list);
 735         return ret;
 736 }
 737
 738 static int ttm_bo_man_get_node(struct ttm_buffer_object *bo,
 739                                 struct ttm_mem_type_manager *man,
 740                                 struct ttm_placement *placement,
 741                                 struct ttm_mem_reg *mem,
 742                                 struct drm_mm_node **node)
 743 {
 744         struct ttm_bo_global *glob = bo->glob;
 745         unsigned long lpfn;
 746         int ret;
 747
 748         lpfn = placement->lpfn;
 749         if (!lpfn)
 750                 lpfn = man->size;
 751         *node = NULL;
 752         do {
 753                 ret = drm_mm_pre_get(&man->manager);
 754                 if (unlikely(ret))
 755                         return ret;
 756
 757                 spin_lock(&glob->lru_lock);
 758                 *node = drm_mm_search_free_in_range(&man->manager,
 759                                         mem->num_pages, mem->page_alignment,
 760                                         placement->fpfn, lpfn, 1);
 761                 if (unlikely(*node == NULL)) {
 762                         spin_unlock(&glob->lru_lock);
 763                         return 0;
 764                 }
 765                 *node = drm_mm_get_block_atomic_range(*node, mem->num_pages,
 766                                                         mem->page_alignment,
 767                                                         placement->fpfn,
 768                                                         lpfn);
 769                 spin_unlock(&glob->lru_lock);
 770         } while (*node == NULL);
 771         return 0;
 772 }
 773
 774 /**
 775  * Repeatedly evict memory from the LRU for @mem_type until we create enough
 776  * space, or we've evicted everything and there isn't enough space.
 777  */
 778 static int ttm_bo_mem_force_space(struct ttm_buffer_object *bo,
 779                                         uint32_t mem_type,
 780                                         struct ttm_placement *placement,
 781                                         struct ttm_mem_reg *mem,
 782                                         bool interruptible,
 783                                         bool no_wait_reserve,
 784                                         bool no_wait_gpu)
 785 {
 786         struct ttm_bo_device *bdev = bo->bdev;
 787         struct ttm_bo_global *glob = bdev->glob;
 788         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
 789         struct drm_mm_node *node;
 790         int ret;
 791
 792         do {
 793                 ret = ttm_bo_man_get_node(bo, man, placement, mem, &node);
 794                 if (unlikely(ret != 0))
 795                         return ret;
 796                 if (node)
 797                         break;
 798                 spin_lock(&glob->lru_lock);
 799                 if (list_empty(&man->lru)) {
 800                         spin_unlock(&glob->lru_lock);
 801                         break;
 802                 }
 803                 spin_unlock(&glob->lru_lock);
 804                 ret = ttm_mem_evict_first(bdev, mem_type, interruptible,
 805                                                 no_wait_reserve, no_wait_gpu);
 806                 if (unlikely(ret != 0))
 807                         return ret;
 808         } while (1);
 809         if (node == NULL)
 810                 return -ENOMEM;
 811         mem->mm_node = node;
 812         mem->mem_type = mem_type;
 813         return 0;
 814 }
 815
 816 static uint32_t ttm_bo_select_caching(struct ttm_mem_type_manager *man,
 817                                       uint32_t cur_placement,
 818                                       uint32_t proposed_placement)
 819 {
 820         uint32_t caching = proposed_placement & TTM_PL_MASK_CACHING;
 821         uint32_t result = proposed_placement & ~TTM_PL_MASK_CACHING;
 822
 823         /**
 824          * Keep current caching if possible.
 825          */
 826
 827         if ((cur_placement & caching) != 0)
 828                 result |= (cur_placement & caching);
 829         else if ((man->default_caching & caching) != 0)
 830                 result |= man->default_caching;
 831         else if ((TTM_PL_FLAG_CACHED & caching) != 0)
 832                 result |= TTM_PL_FLAG_CACHED;
 833         else if ((TTM_PL_FLAG_WC & caching) != 0)
 834                 result |= TTM_PL_FLAG_WC;
 835         else if ((TTM_PL_FLAG_UNCACHED & caching) != 0)
 836                 result |= TTM_PL_FLAG_UNCACHED;
 837
 838         return result;
 839 }
 840
 841 static bool ttm_bo_mt_compatible(struct ttm_mem_type_manager *man,
 842                                  bool disallow_fixed,
 843                                  uint32_t mem_type,
 844                                  uint32_t proposed_placement,
 845                                  uint32_t *masked_placement)
 846 {
 847         uint32_t cur_flags = ttm_bo_type_flags(mem_type);
 848
 849         if ((man->flags & TTM_MEMTYPE_FLAG_FIXED) && disallow_fixed)
 850                 return false;
 851
 852         if ((cur_flags & proposed_placement & TTM_PL_MASK_MEM) == 0)
 853                 return false;
 854
 855         if ((proposed_placement & man->available_caching) == 0)
 856                 return false;
 857
 858         cur_flags |= (proposed_placement & man->available_caching);
 859
 860         *masked_placement = cur_flags;
 861         return true;
 862 }
 863
 864 /**
 865  * Creates space for memory region @mem according to its type.
 866  *
 867  * This function first searches for free space in compatible memory types in
 868  * the priority order defined by the driver.  If free space isn't found, then
 869  * ttm_bo_mem_force_space is attempted in priority order to evict and find
 870  * space.
 871  */
 872 int ttm_bo_mem_space(struct ttm_buffer_object *bo,
 873                         struct ttm_placement *placement,
 874                         struct ttm_mem_reg *mem,
 875                         bool interruptible, bool no_wait_reserve,
 876                         bool no_wait_gpu)
 877 {
 878         struct ttm_bo_device *bdev = bo->bdev;
 879         struct ttm_mem_type_manager *man;
 880         uint32_t mem_type = TTM_PL_SYSTEM;
 881         uint32_t cur_flags = 0;
 882         bool type_found = false;
 883         bool type_ok = false;
 884         bool has_erestartsys = false;
 885         struct drm_mm_node *node = NULL;
 886         int i, ret;
 887
 888         mem->mm_node = NULL;
 889         for (i = 0; i < placement->num_placement; ++i) {
 890                 ret = ttm_mem_type_from_flags(placement->placement[i],
 891                                                 &mem_type);
 892                 if (ret)
 893                         return ret;
 894                 man = &bdev->man[mem_type];
 895
 896                 type_ok = ttm_bo_mt_compatible(man,
 897                                                 bo->type == ttm_bo_type_user,
 898                                                 mem_type,
 899                                                 placement->placement[i],
 900                                                 &cur_flags);
 901
 902                 if (!type_ok)
 903                         continue;
 904
 905                 cur_flags = ttm_bo_select_caching(man, bo->mem.placement,
 906                                                   cur_flags);
 907                 /*
 908                  * Use the access and other non-mapping-related flag bits from
 909                  * the memory placement flags to the current flags
 910                  */
 911                 ttm_flag_masked(&cur_flags, placement->placement[i],
 912                                 ~TTM_PL_MASK_MEMTYPE);
 913
 914                 if (mem_type == TTM_PL_SYSTEM)
 915                         break;
 916
 917                 if (man->has_type && man->use_type) {
 918                         type_found = true;
 919                         ret = ttm_bo_man_get_node(bo, man, placement, mem,
 920                                                         &node);
 921                         if (unlikely(ret))
 922                                 return ret;
 923                 }
 924                 if (node)
 925                         break;
 926         }
 927
 928         if ((type_ok && (mem_type == TTM_PL_SYSTEM)) || node) {
 929                 mem->mm_node = node;
 930                 mem->mem_type = mem_type;
 931                 mem->placement = cur_flags;
 932                 if (node)
 933                         node->private = bo;
 934                 return 0;
 935         }
 936
 937         if (!type_found)
 938                 return -EINVAL;
 939
 940         for (i = 0; i < placement->num_busy_placement; ++i) {
 941                 ret = ttm_mem_type_from_flags(placement->busy_placement[i],
 942                                                 &mem_type);
 943                 if (ret)
 944                         return ret;
 945                 man = &bdev->man[mem_type];
 946                 if (!man->has_type)
 947                         continue;
 948                 if (!ttm_bo_mt_compatible(man,
 949                                                 bo->type == ttm_bo_type_user,
 950                                                 mem_type,
 951                                                 placement->busy_placement[i],
 952                                                 &cur_flags))
 953                         continue;
 954
 955                 cur_flags = ttm_bo_select_caching(man, bo->mem.placement,
 956                                                   cur_flags);
 957                 /*
 958                  * Use the access and other non-mapping-related flag bits from
 959                  * the memory placement flags to the current flags
 960                  */
 961                 ttm_flag_masked(&cur_flags, placement->busy_placement[i],
 962                                 ~TTM_PL_MASK_MEMTYPE);
 963
 964
 965                 if (mem_type == TTM_PL_SYSTEM) {
 966                         mem->mem_type = mem_type;
 967                         mem->placement = cur_flags;
 968                         mem->mm_node = NULL;
 969                         return 0;
 970                 }
 971
 972                 ret = ttm_bo_mem_force_space(bo, mem_type, placement, mem,
 973                                                 interruptible, no_wait_reserve, no_wait_gpu);
 974                 if (ret == 0 && mem->mm_node) {
 975                         mem->placement = cur_flags;
 976                         mem->mm_node->private = bo;
 977                         return 0;
 978                 }
 979                 if (ret == -ERESTARTSYS)
 980                         has_erestartsys = true;
 981         }
 982         ret = (has_erestartsys) ? -ERESTARTSYS : -ENOMEM;
 983         return ret;
 984 }
 985 EXPORT_SYMBOL(ttm_bo_mem_space);
 986
 987 int ttm_bo_wait_cpu(struct ttm_buffer_object *bo, bool no_wait)
 988 {
 989         if ((atomic_read(&bo->cpu_writers) > 0) && no_wait)
 990                 return -EBUSY;
 991
 992         return wait_event_interruptible(bo->event_queue,
 993                                         atomic_read(&bo->cpu_writers) == 0);
 994 }
 995 EXPORT_SYMBOL(ttm_bo_wait_cpu);
 996
 997 int ttm_bo_move_buffer(struct ttm_buffer_object *bo,
 998                         struct ttm_placement *placement,
 999                         bool interruptible, bool no_wait_reserve,
1000                         bool no_wait_gpu)
1001 {
1002         struct ttm_bo_global *glob = bo->glob;
1003         int ret = 0;
1004         struct ttm_mem_reg mem;
1005
1006         BUG_ON(!atomic_read(&bo->reserved));
1007
1008         /*
1009          * FIXME: It's possible to pipeline buffer moves.
1010          * Have the driver move function wait for idle when necessary,
1011          * instead of doing it here.
1012          */
1013         spin_lock(&bo->lock);
1014         ret = ttm_bo_wait(bo, false, interruptible, no_wait_gpu);
1015         spin_unlock(&bo->lock);
1016         if (ret)
1017                 return ret;
1018         mem.num_pages = bo->num_pages;
1019         mem.size = mem.num_pages << PAGE_SHIFT;
1020         mem.page_alignment = bo->mem.page_alignment;
1021         mem.bus.io_reserved = false;
1022         /*
1023          * Determine where to move the buffer.
1024          */
1025         ret = ttm_bo_mem_space(bo, placement, &mem, interruptible, no_wait_reserve, no_wait_gpu);
1026         if (ret)
1027                 goto out_unlock;
1028         ret = ttm_bo_handle_move_mem(bo, &mem, false, interruptible, no_wait_reserve, no_wait_gpu);
1029 out_unlock:
1030         if (ret && mem.mm_node) {
1031                 spin_lock(&glob->lru_lock);
1032                 mem.mm_node->private = NULL;
1033                 drm_mm_put_block(mem.mm_node);
1034                 spin_unlock(&glob->lru_lock);
1035         }
1036         return ret;
1037 }
1038
1039 static int ttm_bo_mem_compat(struct ttm_placement *placement,
1040                              struct ttm_mem_reg *mem)
1041 {
1042         int i;
1043         struct drm_mm_node *node = mem->mm_node;
1044
1045         if (node && placement->lpfn != 0 &&
1046             (node->start < placement->fpfn ||
1047              node->start + node->size > placement->lpfn))
1048                 return -1;
1049
1050         for (i = 0; i < placement->num_placement; i++) {
1051                 if ((placement->placement[i] & mem->placement &
1052                         TTM_PL_MASK_CACHING) &&
1053                         (placement->placement[i] & mem->placement &
1054                         TTM_PL_MASK_MEM))
1055                         return i;
1056         }
1057         return -1;
1058 }
1059
1060 int ttm_bo_validate(struct ttm_buffer_object *bo,
1061                         struct ttm_placement *placement,
1062                         bool interruptible, bool no_wait_reserve,
1063                         bool no_wait_gpu)
1064 {
1065         int ret;
1066
1067         BUG_ON(!atomic_read(&bo->reserved));
1068         /* Check that range is valid */
1069         if (placement->lpfn || placement->fpfn)
1070                 if (placement->fpfn > placement->lpfn ||
1071                         (placement->lpfn - placement->fpfn) < bo->num_pages)
1072                         return -EINVAL;
1073         /*
1074          * Check whether we need to move buffer.
1075          */
1076         ret = ttm_bo_mem_compat(placement, &bo->mem);
1077         if (ret < 0) {
1078                 ret = ttm_bo_move_buffer(bo, placement, interruptible, no_wait_reserve, no_wait_gpu);
1079                 if (ret)
1080                         return ret;
1081         } else {
1082                 /*
1083                  * Use the access and other non-mapping-related flag bits from
1084                  * the compatible memory placement flags to the active flags
1085                  */
1086                 ttm_flag_masked(&bo->mem.placement, placement->placement[ret],
1087                                 ~TTM_PL_MASK_MEMTYPE);
1088         }
1089         /*
1090          * We might need to add a TTM.
1091          */
1092         if (bo->mem.mem_type == TTM_PL_SYSTEM && bo->ttm == NULL) {
1093                 ret = ttm_bo_add_ttm(bo, true);
1094                 if (ret)
1095                         return ret;
1096         }
1097         return 0;
1098 }
1099 EXPORT_SYMBOL(ttm_bo_validate);
1100
1101 int ttm_bo_check_placement(struct ttm_buffer_object *bo,
1102                                 struct ttm_placement *placement)
1103 {
1104         int i;
1105
1106         if (placement->fpfn || placement->lpfn) {
1107                 if (bo->mem.num_pages > (placement->lpfn - placement->fpfn)) {
1108                         printk(KERN_ERR TTM_PFX "Page number range to small "
1109                                 "Need %lu pages, range is [%u, %u]\n",
1110                                 bo->mem.num_pages, placement->fpfn,
1111                                 placement->lpfn);
1112                         return -EINVAL;
1113                 }
1114         }
1115         for (i = 0; i < placement->num_placement; i++) {
1116                 if (!capable(CAP_SYS_ADMIN)) {
1117                         if (placement->placement[i] & TTM_PL_FLAG_NO_EVICT) {
1118                                 printk(KERN_ERR TTM_PFX "Need to be root to "
1119                                         "modify NO_EVICT status.\n");
1120                                 return -EINVAL;
1121                         }
1122                 }
1123         }
1124         for (i = 0; i < placement->num_busy_placement; i++) {
1125                 if (!capable(CAP_SYS_ADMIN)) {
1126                         if (placement->busy_placement[i] & TTM_PL_FLAG_NO_EVICT) {
1127                                 printk(KERN_ERR TTM_PFX "Need to be root to "
1128                                         "modify NO_EVICT status.\n");
1129                                 return -EINVAL;
1130                         }
1131                 }
1132         }
1133         return 0;
1134 }
1135
1136 int ttm_bo_init(struct ttm_bo_device *bdev,
1137                 struct ttm_buffer_object *bo,
1138                 unsigned long size,
1139                 enum ttm_bo_type type,
1140                 struct ttm_placement *placement,
1141                 uint32_t page_alignment,
1142                 unsigned long buffer_start,
1143                 bool interruptible,
1144                 struct file *persistant_swap_storage,
1145                 size_t acc_size,
1146                 void (*destroy) (struct ttm_buffer_object *))
1147 {
1148         int ret = 0;
1149         unsigned long num_pages;
1150
1151         size += buffer_start & ~PAGE_MASK;
1152         num_pages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
1153         if (num_pages == 0) {
1154                 printk(KERN_ERR TTM_PFX "Illegal buffer object size.\n");
1155                 return -EINVAL;
1156         }
1157         bo->destroy = destroy;
1158
1159         spin_lock_init(&bo->lock);
1160         kref_init(&bo->kref);
1161         kref_init(&bo->list_kref);
1162         atomic_set(&bo->cpu_writers, 0);
1163         atomic_set(&bo->reserved, 1);
1164         init_waitqueue_head(&bo->event_queue);
1165         INIT_LIST_HEAD(&bo->lru);
1166         INIT_LIST_HEAD(&bo->ddestroy);
1167         INIT_LIST_HEAD(&bo->swap);
1168         bo->bdev = bdev;
1169         bo->glob = bdev->glob;
1170         bo->type = type;
1171         bo->num_pages = num_pages;
1172         bo->mem.size = num_pages << PAGE_SHIFT;
1173         bo->mem.mem_type = TTM_PL_SYSTEM;
1174         bo->mem.num_pages = bo->num_pages;
1175         bo->mem.mm_node = NULL;
1176         bo->mem.page_alignment = page_alignment;
1177         bo->mem.bus.io_reserved = false;
1178         bo->buffer_start = buffer_start & PAGE_MASK;
1179         bo->priv_flags = 0;
1180         bo->mem.placement = (TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED);
1181         bo->seq_valid = false;
1182         bo->persistant_swap_storage = persistant_swap_storage;
1183         bo->acc_size = acc_size;
1184         atomic_inc(&bo->glob->bo_count);
1185
1186         ret = ttm_bo_check_placement(bo, placement);
1187         if (unlikely(ret != 0))
1188                 goto out_err;
1189
1190         /*
1191          * For ttm_bo_type_device buffers, allocate
1192          * address space from the device.
1193          */
1194         if (bo->type == ttm_bo_type_device) {
1195                 ret = ttm_bo_setup_vm(bo);
1196                 if (ret)
1197                         goto out_err;
1198         }
1199
1200         ret = ttm_bo_validate(bo, placement, interruptible, false, false);
1201         if (ret)
1202                 goto out_err;
1203
1204         ttm_bo_unreserve(bo);
1205         return 0;
1206
1207 out_err:
1208         ttm_bo_unreserve(bo);
1209         ttm_bo_unref(&bo);
1210
1211         return ret;
1212 }
1213 EXPORT_SYMBOL(ttm_bo_init);
1214
1215 static inline size_t ttm_bo_size(struct ttm_bo_global *glob,
1216                                  unsigned long num_pages)
1217 {
1218         size_t page_array_size = (num_pages * sizeof(void *) + PAGE_SIZE - 1) &
1219             PAGE_MASK;
1220
1221         return glob->ttm_bo_size + 2 * page_array_size;
1222 }
1223
1224 int ttm_bo_create(struct ttm_bo_device *bdev,
1225                         unsigned long size,
1226                         enum ttm_bo_type type,
1227                         struct ttm_placement *placement,
1228                         uint32_t page_alignment,
1229                         unsigned long buffer_start,
1230                         bool interruptible,
1231                         struct file *persistant_swap_storage,
1232                         struct ttm_buffer_object **p_bo)
1233 {
1234         struct ttm_buffer_object *bo;
1235         struct ttm_mem_global *mem_glob = bdev->glob->mem_glob;
1236         int ret;
1237
1238         size_t acc_size =
1239             ttm_bo_size(bdev->glob, (size + PAGE_SIZE - 1) >> PAGE_SHIFT);
1240         ret = ttm_mem_global_alloc(mem_glob, acc_size, false, false);
1241         if (unlikely(ret != 0))
1242                 return ret;
1243
1244         bo = kzalloc(sizeof(*bo), GFP_KERNEL);
1245
1246         if (unlikely(bo == NULL)) {
1247                 ttm_mem_global_free(mem_glob, acc_size);
1248                 return -ENOMEM;
1249         }
1250
1251         ret = ttm_bo_init(bdev, bo, size, type, placement, page_alignment,
1252                                 buffer_start, interruptible,
1253                                 persistant_swap_storage, acc_size, NULL);
1254         if (likely(ret == 0))
1255                 *p_bo = bo;
1256
1257         return ret;
1258 }
1259
1260 static int ttm_bo_force_list_clean(struct ttm_bo_device *bdev,
1261                                         unsigned mem_type, bool allow_errors)
1262 {
1263         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
1264         struct ttm_bo_global *glob = bdev->glob;
1265         int ret;
1266
1267         /*
1268          * Can't use standard list traversal since we're unlocking.
1269          */
1270
1271         spin_lock(&glob->lru_lock);
1272         while (!list_empty(&man->lru)) {
1273                 spin_unlock(&glob->lru_lock);
1274                 ret = ttm_mem_evict_first(bdev, mem_type, false, false, false);
1275                 if (ret) {
1276                         if (allow_errors) {
1277                                 return ret;
1278                         } else {
1279                                 printk(KERN_ERR TTM_PFX
1280                                         "Cleanup eviction failed\n");
1281                         }
1282                 }
1283                 spin_lock(&glob->lru_lock);
1284         }
1285         spin_unlock(&glob->lru_lock);
1286         return 0;
1287 }
1288
1289 int ttm_bo_clean_mm(struct ttm_bo_device *bdev, unsigned mem_type)
1290 {
1291         struct ttm_bo_global *glob = bdev->glob;
1292         struct ttm_mem_type_manager *man;
1293         int ret = -EINVAL;
1294
1295         if (mem_type >= TTM_NUM_MEM_TYPES) {
1296                 printk(KERN_ERR TTM_PFX "Illegal memory type %d\n", mem_type);
1297                 return ret;
1298         }
1299         man = &bdev->man[mem_type];
1300
1301         if (!man->has_type) {
1302                 printk(KERN_ERR TTM_PFX "Trying to take down uninitialized "
1303                        "memory manager type %u\n", mem_type);
1304                 return ret;
1305         }
1306
1307         man->use_type = false;
1308         man->has_type = false;
1309
1310         ret = 0;
1311         if (mem_type > 0) {
1312                 ttm_bo_force_list_clean(bdev, mem_type, false);
1313
1314                 spin_lock(&glob->lru_lock);
1315                 if (drm_mm_clean(&man->manager))
1316                         drm_mm_takedown(&man->manager);
1317                 else
1318                         ret = -EBUSY;
1319
1320                 spin_unlock(&glob->lru_lock);
1321         }
1322
1323         return ret;
1324 }
1325 EXPORT_SYMBOL(ttm_bo_clean_mm);
1326
1327 int ttm_bo_evict_mm(struct ttm_bo_device *bdev, unsigned mem_type)
1328 {
1329         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
1330
1331         if (mem_type == 0 || mem_type >= TTM_NUM_MEM_TYPES) {
1332                 printk(KERN_ERR TTM_PFX
1333                        "Illegal memory manager memory type %u.\n",
1334                        mem_type);
1335                 return -EINVAL;
1336         }
1337
1338         if (!man->has_type) {
1339                 printk(KERN_ERR TTM_PFX
1340                        "Memory type %u has not been initialized.\n",
1341                        mem_type);
1342                 return 0;
1343         }
1344
1345         return ttm_bo_force_list_clean(bdev, mem_type, true);
1346 }
1347 EXPORT_SYMBOL(ttm_bo_evict_mm);
1348
1349 int ttm_bo_init_mm(struct ttm_bo_device *bdev, unsigned type,
1350                         unsigned long p_size)
1351 {
1352         int ret = -EINVAL;
1353         struct ttm_mem_type_manager *man;
1354
1355         if (type >= TTM_NUM_MEM_TYPES) {
1356                 printk(KERN_ERR TTM_PFX "Illegal memory type %d\n", type);
1357                 return ret;
1358         }
1359
1360         man = &bdev->man[type];
1361         if (man->has_type) {
1362                 printk(KERN_ERR TTM_PFX
1363                        "Memory manager already initialized for type %d\n",
1364                        type);
1365                 return ret;
1366         }
1367
1368         ret = bdev->driver->init_mem_type(bdev, type, man);
1369         if (ret)
1370                 return ret;
1371
1372         ret = 0;
1373         if (type != TTM_PL_SYSTEM) {
1374                 if (!p_size) {
1375                         printk(KERN_ERR TTM_PFX
1376                                "Zero size memory manager type %d\n",
1377                                type);
1378                         return ret;
1379                 }
1380                 ret = drm_mm_init(&man->manager, 0, p_size);
1381                 if (ret)
1382                         return ret;
1383         }
1384         man->has_type = true;
1385         man->use_type = true;
1386         man->size = p_size;
1387
1388         INIT_LIST_HEAD(&man->lru);
1389
1390         return 0;
1391 }
1392 EXPORT_SYMBOL(ttm_bo_init_mm);
1393
1394 static void ttm_bo_global_kobj_release(struct kobject *kobj)
1395 {
1396         struct ttm_bo_global *glob =
1397                 container_of(kobj, struct ttm_bo_global, kobj);
1398
1399         ttm_mem_unregister_shrink(glob->mem_glob, &glob->shrink);
1400         __free_page(glob->dummy_read_page);
1401         kfree(glob);
1402 }
1403
1404 void ttm_bo_global_release(struct ttm_global_reference *ref)
1405 {
1406         struct ttm_bo_global *glob = ref->object;
1407
1408         kobject_del(&glob->kobj);
1409         kobject_put(&glob->kobj);
1410 }
1411 EXPORT_SYMBOL(ttm_bo_global_release);
1412
1413 int ttm_bo_global_init(struct ttm_global_reference *ref)
1414 {
1415         struct ttm_bo_global_ref *bo_ref =
1416                 container_of(ref, struct ttm_bo_global_ref, ref);
1417         struct ttm_bo_global *glob = ref->object;
1418         int ret;
1419
1420         mutex_init(&glob->device_list_mutex);
1421         spin_lock_init(&glob->lru_lock);
1422         glob->mem_glob = bo_ref->mem_glob;
1423         glob->dummy_read_page = alloc_page(__GFP_ZERO | GFP_DMA32);
1424
1425         if (unlikely(glob->dummy_read_page == NULL)) {
1426                 ret = -ENOMEM;
1427                 goto out_no_drp;
1428         }
1429
1430         INIT_LIST_HEAD(&glob->swap_lru);
1431         INIT_LIST_HEAD(&glob->device_list);
1432
1433         ttm_mem_init_shrink(&glob->shrink, ttm_bo_swapout);
1434         ret = ttm_mem_register_shrink(glob->mem_glob, &glob->shrink);
1435         if (unlikely(ret != 0)) {
1436                 printk(KERN_ERR TTM_PFX
1437                        "Could not register buffer object swapout.\n");
1438                 goto out_no_shrink;
1439         }
1440
1441         glob->ttm_bo_extra_size =
1442                 ttm_round_pot(sizeof(struct ttm_tt)) +
1443                 ttm_round_pot(sizeof(struct ttm_backend));
1444
1445         glob->ttm_bo_size = glob->ttm_bo_extra_size +
1446                 ttm_round_pot(sizeof(struct ttm_buffer_object));
1447
1448         atomic_set(&glob->bo_count, 0);
1449
1450         ret = kobject_init_and_add(
1451                 &glob->kobj, &ttm_bo_glob_kobj_type, ttm_get_kobj(), "buffer_objects");
1452         if (unlikely(ret != 0))
1453                 kobject_put(&glob->kobj);
1454         return ret;
1455 out_no_shrink:
1456         __free_page(glob->dummy_read_page);
1457 out_no_drp:
1458         kfree(glob);
1459         return ret;
1460 }
1461 EXPORT_SYMBOL(ttm_bo_global_init);
1462
1463
1464 int ttm_bo_device_release(struct ttm_bo_device *bdev)
1465 {
1466         int ret = 0;
1467         unsigned i = TTM_NUM_MEM_TYPES;
1468         struct ttm_mem_type_manager *man;
1469         struct ttm_bo_global *glob = bdev->glob;
1470
1471         while (i--) {
1472                 man = &bdev->man[i];
1473                 if (man->has_type) {
1474                         man->use_type = false;
1475                         if ((i != TTM_PL_SYSTEM) && ttm_bo_clean_mm(bdev, i)) {
1476                                 ret = -EBUSY;
1477                                 printk(KERN_ERR TTM_PFX
1478                                        "DRM memory manager type %d "
1479                                        "is not clean.\n", i);
1480                         }
1481                         man->has_type = false;
1482                 }
1483         }
1484
1485         mutex_lock(&glob->device_list_mutex);
1486         list_del(&bdev->device_list);
1487         mutex_unlock(&glob->device_list_mutex);
1488
1489         if (!cancel_delayed_work(&bdev->wq))
1490                 flush_scheduled_work();
1491
1492         while (ttm_bo_delayed_delete(bdev, true))
1493                 ;
1494
1495         spin_lock(&glob->lru_lock);
1496         if (list_empty(&bdev->ddestroy))
1497                 TTM_DEBUG("Delayed destroy list was clean\n");
1498
1499         if (list_empty(&bdev->man[0].lru))
1500                 TTM_DEBUG("Swap list was clean\n");
1501         spin_unlock(&glob->lru_lock);
1502
1503         BUG_ON(!drm_mm_clean(&bdev->addr_space_mm));
1504         write_lock(&bdev->vm_lock);
1505         drm_mm_takedown(&bdev->addr_space_mm);
1506         write_unlock(&bdev->vm_lock);
1507
1508         return ret;
1509 }
1510 EXPORT_SYMBOL(ttm_bo_device_release);
1511
1512 int ttm_bo_device_init(struct ttm_bo_device *bdev,
1513                        struct ttm_bo_global *glob,
1514                        struct ttm_bo_driver *driver,
1515                        uint64_t file_page_offset,
1516                        bool need_dma32)
1517 {
1518         int ret = -EINVAL;
1519
1520         rwlock_init(&bdev->vm_lock);
1521         bdev->driver = driver;
1522
1523         memset(bdev->man, 0, sizeof(bdev->man));
1524
1525         /*
1526          * Initialize the system memory buffer type.
1527          * Other types need to be driver / IOCTL initialized.
1528          */
1529         ret = ttm_bo_init_mm(bdev, TTM_PL_SYSTEM, 0);
1530         if (unlikely(ret != 0))
1531                 goto out_no_sys;
1532
1533         bdev->addr_space_rb = RB_ROOT;
1534         ret = drm_mm_init(&bdev->addr_space_mm, file_page_offset, 0x10000000);
1535         if (unlikely(ret != 0))
1536                 goto out_no_addr_mm;
1537
1538         INIT_DELAYED_WORK(&bdev->wq, ttm_bo_delayed_workqueue);
1539         bdev->nice_mode = true;
1540         INIT_LIST_HEAD(&bdev->ddestroy);
1541         bdev->dev_mapping = NULL;
1542         bdev->glob = glob;
1543         bdev->need_dma32 = need_dma32;
1544
1545         mutex_lock(&glob->device_list_mutex);
1546         list_add_tail(&bdev->device_list, &glob->device_list);
1547         mutex_unlock(&glob->device_list_mutex);
1548
1549         return 0;
1550 out_no_addr_mm:
1551         ttm_bo_clean_mm(bdev, 0);
1552 out_no_sys:
1553         return ret;
1554 }
1555 EXPORT_SYMBOL(ttm_bo_device_init);
1556
1557 /*
1558  * buffer object vm functions.
1559  */
1560
1561 bool ttm_mem_reg_is_pci(struct ttm_bo_device *bdev, struct ttm_mem_reg *mem)
1562 {
1563         struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
1564
1565         if (!(man->flags & TTM_MEMTYPE_FLAG_FIXED)) {
1566                 if (mem->mem_type == TTM_PL_SYSTEM)
1567                         return false;
1568
1569                 if (man->flags & TTM_MEMTYPE_FLAG_CMA)
1570                         return false;
1571
1572                 if (mem->placement & TTM_PL_FLAG_CACHED)
1573                         return false;
1574         }
1575         return true;
1576 }
1577
1578 void ttm_bo_unmap_virtual(struct ttm_buffer_object *bo)
1579 {
1580         struct ttm_bo_device *bdev = bo->bdev;
1581         loff_t offset = (loff_t) bo->addr_space_offset;
1582         loff_t holelen = ((loff_t) bo->mem.num_pages) << PAGE_SHIFT;
1583
1584         if (!bdev->dev_mapping)
1585                 return;
1586         unmap_mapping_range(bdev->dev_mapping, offset, holelen, 1);
1587         ttm_mem_io_free(bdev, &bo->mem);
1588 }
1589 EXPORT_SYMBOL(ttm_bo_unmap_virtual);
1590
1591 static void ttm_bo_vm_insert_rb(struct ttm_buffer_object *bo)
1592 {
1593         struct ttm_bo_device *bdev = bo->bdev;
1594         struct rb_node **cur = &bdev->addr_space_rb.rb_node;
1595         struct rb_node *parent = NULL;
1596         struct ttm_buffer_object *cur_bo;
1597         unsigned long offset = bo->vm_node->start;
1598         unsigned long cur_offset;
1599
1600         while (*cur) {
1601                 parent = *cur;
1602                 cur_bo = rb_entry(parent, struct ttm_buffer_object, vm_rb);
1603                 cur_offset = cur_bo->vm_node->start;
1604                 if (offset < cur_offset)
1605                         cur = &parent->rb_left;
1606                 else if (offset > cur_offset)
1607                         cur = &parent->rb_right;
1608                 else
1609                         BUG();
1610         }
1611
1612         rb_link_node(&bo->vm_rb, parent, cur);
1613         rb_insert_color(&bo->vm_rb, &bdev->addr_space_rb);
1614 }
1615
1616 /**
1617  * ttm_bo_setup_vm:
1618  *
1619  * @bo: the buffer to allocate address space for
1620  *
1621  * Allocate address space in the drm device so that applications
1622  * can mmap the buffer and access the contents. This only
1623  * applies to ttm_bo_type_device objects as others are not
1624  * placed in the drm device address space.
1625  */
1626
1627 static int ttm_bo_setup_vm(struct ttm_buffer_object *bo)
1628 {
1629         struct ttm_bo_device *bdev = bo->bdev;
1630         int ret;
1631
1632 retry_pre_get:
1633         ret = drm_mm_pre_get(&bdev->addr_space_mm);
1634         if (unlikely(ret != 0))
1635                 return ret;
1636
1637         write_lock(&bdev->vm_lock);
1638         bo->vm_node = drm_mm_search_free(&bdev->addr_space_mm,
1639                                          bo->mem.num_pages, 0, 0);
1640
1641         if (unlikely(bo->vm_node == NULL)) {
1642                 ret = -ENOMEM;
1643                 goto out_unlock;
1644         }
1645
1646         bo->vm_node = drm_mm_get_block_atomic(bo->vm_node,
1647                                               bo->mem.num_pages, 0);
1648
1649         if (unlikely(bo->vm_node == NULL)) {
1650                 write_unlock(&bdev->vm_lock);
1651                 goto retry_pre_get;
1652         }
1653
1654         ttm_bo_vm_insert_rb(bo);
1655         write_unlock(&bdev->vm_lock);
1656         bo->addr_space_offset = ((uint64_t) bo->vm_node->start) << PAGE_SHIFT;
1657
1658         return 0;
1659 out_unlock:
1660         write_unlock(&bdev->vm_lock);
1661         return ret;
1662 }
1663
1664 int ttm_bo_wait(struct ttm_buffer_object *bo,
1665                 bool lazy, bool interruptible, bool no_wait)
1666 {
1667         struct ttm_bo_driver *driver = bo->bdev->driver;
1668         void *sync_obj;
1669         void *sync_obj_arg;
1670         int ret = 0;
1671
1672         if (likely(bo->sync_obj == NULL))
1673                 return 0;
1674
1675         while (bo->sync_obj) {
1676
1677                 if (driver->sync_obj_signaled(bo->sync_obj, bo->sync_obj_arg)) {
1678                         void *tmp_obj = bo->sync_obj;
1679                         bo->sync_obj = NULL;
1680                         clear_bit(TTM_BO_PRIV_FLAG_MOVING, &bo->priv_flags);
1681                         spin_unlock(&bo->lock);
1682                         driver->sync_obj_unref(&tmp_obj);
1683                         spin_lock(&bo->lock);
1684                         continue;
1685                 }
1686
1687                 if (no_wait)
1688                         return -EBUSY;
1689
1690                 sync_obj = driver->sync_obj_ref(bo->sync_obj);
1691                 sync_obj_arg = bo->sync_obj_arg;
1692                 spin_unlock(&bo->lock);
1693                 ret = driver->sync_obj_wait(sync_obj, sync_obj_arg,
1694                                             lazy, interruptible);
1695                 if (unlikely(ret != 0)) {
1696                         driver->sync_obj_unref(&sync_obj);
1697                         spin_lock(&bo->lock);
1698                         return ret;
1699                 }
1700                 spin_lock(&bo->lock);
1701                 if (likely(bo->sync_obj == sync_obj &&
1702                            bo->sync_obj_arg == sync_obj_arg)) {
1703                         void *tmp_obj = bo->sync_obj;
1704                         bo->sync_obj = NULL;
1705                         clear_bit(TTM_BO_PRIV_FLAG_MOVING,
1706                                   &bo->priv_flags);
1707                         spin_unlock(&bo->lock);
1708                         driver->sync_obj_unref(&sync_obj);
1709                         driver->sync_obj_unref(&tmp_obj);
1710                         spin_lock(&bo->lock);
1711                 } else {
1712                         spin_unlock(&bo->lock);
1713                         driver->sync_obj_unref(&sync_obj);
1714                         spin_lock(&bo->lock);
1715                 }
1716         }
1717         return 0;
1718 }
1719 EXPORT_SYMBOL(ttm_bo_wait);
1720
1721 int ttm_bo_synccpu_write_grab(struct ttm_buffer_object *bo, bool no_wait)
1722 {
1723         int ret = 0;
1724
1725         /*
1726          * Using ttm_bo_reserve makes sure the lru lists are updated.
1727          */
1728
1729         ret = ttm_bo_reserve(bo, true, no_wait, false, 0);
1730         if (unlikely(ret != 0))
1731                 return ret;
1732         spin_lock(&bo->lock);
1733         ret = ttm_bo_wait(bo, false, true, no_wait);
1734         spin_unlock(&bo->lock);
1735         if (likely(ret == 0))
1736                 atomic_inc(&bo->cpu_writers);
1737         ttm_bo_unreserve(bo);
1738         return ret;
1739 }
1740 EXPORT_SYMBOL(ttm_bo_synccpu_write_grab);
1741
1742 void ttm_bo_synccpu_write_release(struct ttm_buffer_object *bo)
1743 {
1744         if (atomic_dec_and_test(&bo->cpu_writers))
1745                 wake_up_all(&bo->event_queue);
1746 }
1747 EXPORT_SYMBOL(ttm_bo_synccpu_write_release);
1748
1749 /**
1750  * A buffer object shrink method that tries to swap out the first
1751  * buffer object on the bo_global::swap_lru list.
1752  */
1753
1754 static int ttm_bo_swapout(struct ttm_mem_shrink *shrink)
1755 {
1756         struct ttm_bo_global *glob =
1757             container_of(shrink, struct ttm_bo_global, shrink);
1758         struct ttm_buffer_object *bo;
1759         int ret = -EBUSY;
1760         int put_count;
1761         uint32_t swap_placement = (TTM_PL_FLAG_CACHED | TTM_PL_FLAG_SYSTEM);
1762
1763         spin_lock(&glob->lru_lock);
1764         while (ret == -EBUSY) {
1765                 if (unlikely(list_empty(&glob->swap_lru))) {
1766                         spin_unlock(&glob->lru_lock);
1767                         return -EBUSY;
1768                 }
1769
1770                 bo = list_first_entry(&glob->swap_lru,
1771                                       struct ttm_buffer_object, swap);
1772                 kref_get(&bo->list_kref);
1773
1774                 /**
1775                  * Reserve buffer. Since we unlock while sleeping, we need
1776                  * to re-check that nobody removed us from the swap-list while
1777                  * we slept.
1778                  */
1779
1780                 ret = ttm_bo_reserve_locked(bo, false, true, false, 0);
1781                 if (unlikely(ret == -EBUSY)) {
1782                         spin_unlock(&glob->lru_lock);
1783                         ttm_bo_wait_unreserved(bo, false);
1784                         kref_put(&bo->list_kref, ttm_bo_release_list);
1785                         spin_lock(&glob->lru_lock);
1786                 }
1787         }
1788
1789         BUG_ON(ret != 0);
1790         put_count = ttm_bo_del_from_lru(bo);
1791         spin_unlock(&glob->lru_lock);
1792
1793         while (put_count--)
1794                 kref_put(&bo->list_kref, ttm_bo_ref_bug);
1795
1796         /**
1797          * Wait for GPU, then move to system cached.
1798          */
1799
1800         spin_lock(&bo->lock);
1801         ret = ttm_bo_wait(bo, false, false, false);
1802         spin_unlock(&bo->lock);
1803
1804         if (unlikely(ret != 0))
1805                 goto out;
1806
1807         if ((bo->mem.placement & swap_placement) != swap_placement) {
1808                 struct ttm_mem_reg evict_mem;
1809
1810                 evict_mem = bo->mem;
1811                 evict_mem.mm_node = NULL;
1812                 evict_mem.placement = TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED;
1813                 evict_mem.mem_type = TTM_PL_SYSTEM;
1814
1815                 ret = ttm_bo_handle_move_mem(bo, &evict_mem, true,
1816                                              false, false, false);
1817                 if (unlikely(ret != 0))
1818                         goto out;
1819         }
1820
1821         ttm_bo_unmap_virtual(bo);
1822
1823         /**
1824          * Swap out. Buffer will be swapped in again as soon as
1825          * anyone tries to access a ttm page.
1826          */
1827
1828         if (bo->bdev->driver->swap_notify)
1829                 bo->bdev->driver->swap_notify(bo);
1830
1831         ret = ttm_tt_swapout(bo->ttm, bo->persistant_swap_storage);
1832 out:
1833
1834         /**
1835          *
1836          * Unreserve without putting on LRU to avoid swapping out an
1837          * already swapped buffer.
1838          */
1839
1840         atomic_set(&bo->reserved, 0);
1841         wake_up_all(&bo->event_queue);
1842         kref_put(&bo->list_kref, ttm_bo_release_list);
1843         return ret;
1844 }
1845
1846 void ttm_bo_swapout_all(struct ttm_bo_device *bdev)
1847 {
1848         while (ttm_bo_swapout(&bdev->glob->shrink) == 0)
1849                 ;
1850 }
1851 EXPORT_SYMBOL(ttm_bo_swapout_all);