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                 (*man->func->debug)(man, TTM_PFX);
  89 }
  90
  91 static void ttm_bo_mem_space_debug(struct ttm_buffer_object *bo,
  92                                         struct ttm_placement *placement)
  93 {
  94         int i, ret, mem_type;
  95
  96         printk(KERN_ERR TTM_PFX "No space for %p (%lu pages, %luK, %luM)\n",
  97                 bo, bo->mem.num_pages, bo->mem.size >> 10,
  98                 bo->mem.size >> 20);
  99         for (i = 0; i < placement->num_placement; i++) {
 100                 ret = ttm_mem_type_from_flags(placement->placement[i],
 101                                                 &mem_type);
 102                 if (ret)
 103                         return;
 104                 printk(KERN_ERR TTM_PFX "  placement[%d]=0x%08X (%d)\n",
 105                         i, placement->placement[i], mem_type);
 106                 ttm_mem_type_debug(bo->bdev, mem_type);
 107         }
 108 }
 109
 110 static ssize_t ttm_bo_global_show(struct kobject *kobj,
 111                                   struct attribute *attr,
 112                                   char *buffer)
 113 {
 114         struct ttm_bo_global *glob =
 115                 container_of(kobj, struct ttm_bo_global, kobj);
 116
 117         return snprintf(buffer, PAGE_SIZE, "%lu\n",
 118                         (unsigned long) atomic_read(&glob->bo_count));
 119 }
 120
 121 static struct attribute *ttm_bo_global_attrs[] = {
 122         &ttm_bo_count,
 123         NULL
 124 };
 125
 126 static const struct sysfs_ops ttm_bo_global_ops = {
 127         .show = &ttm_bo_global_show
 128 };
 129
 130 static struct kobj_type ttm_bo_glob_kobj_type  = {
 131         .release = &ttm_bo_global_kobj_release,
 132         .sysfs_ops = &ttm_bo_global_ops,
 133         .default_attrs = ttm_bo_global_attrs
 134 };
 135
 136
 137 static inline uint32_t ttm_bo_type_flags(unsigned type)
 138 {
 139         return 1 << (type);
 140 }
 141
 142 static void ttm_bo_release_list(struct kref *list_kref)
 143 {
 144         struct ttm_buffer_object *bo =
 145             container_of(list_kref, struct ttm_buffer_object, list_kref);
 146         struct ttm_bo_device *bdev = bo->bdev;
 147
 148         BUG_ON(atomic_read(&bo->list_kref.refcount));
 149         BUG_ON(atomic_read(&bo->kref.refcount));
 150         BUG_ON(atomic_read(&bo->cpu_writers));
 151         BUG_ON(bo->sync_obj != NULL);
 152         BUG_ON(bo->mem.mm_node != NULL);
 153         BUG_ON(!list_empty(&bo->lru));
 154         BUG_ON(!list_empty(&bo->ddestroy));
 155
 156         if (bo->ttm)
 157                 ttm_tt_destroy(bo->ttm);
 158         atomic_dec(&bo->glob->bo_count);
 159         if (bo->destroy)
 160                 bo->destroy(bo);
 161         else {
 162                 ttm_mem_global_free(bdev->glob->mem_glob, bo->acc_size);
 163                 kfree(bo);
 164         }
 165 }
 166
 167 int ttm_bo_wait_unreserved(struct ttm_buffer_object *bo, bool interruptible)
 168 {
 169
 170         if (interruptible) {
 171                 int ret = 0;
 172
 173                 ret = wait_event_interruptible(bo->event_queue,
 174                                                atomic_read(&bo->reserved) == 0);
 175                 if (unlikely(ret != 0))
 176                         return ret;
 177         } else {
 178                 wait_event(bo->event_queue, atomic_read(&bo->reserved) == 0);
 179         }
 180         return 0;
 181 }
 182 EXPORT_SYMBOL(ttm_bo_wait_unreserved);
 183
 184 static void ttm_bo_add_to_lru(struct ttm_buffer_object *bo)
 185 {
 186         struct ttm_bo_device *bdev = bo->bdev;
 187         struct ttm_mem_type_manager *man;
 188
 189         BUG_ON(!atomic_read(&bo->reserved));
 190
 191         if (!(bo->mem.placement & TTM_PL_FLAG_NO_EVICT)) {
 192
 193                 BUG_ON(!list_empty(&bo->lru));
 194
 195                 man = &bdev->man[bo->mem.mem_type];
 196                 list_add_tail(&bo->lru, &man->lru);
 197                 kref_get(&bo->list_kref);
 198
 199                 if (bo->ttm != NULL) {
 200                         list_add_tail(&bo->swap, &bo->glob->swap_lru);
 201                         kref_get(&bo->list_kref);
 202                 }
 203         }
 204 }
 205
 206 /**
 207  * Call with the lru_lock held.
 208  */
 209
 210 static int ttm_bo_del_from_lru(struct ttm_buffer_object *bo)
 211 {
 212         int put_count = 0;
 213
 214         if (!list_empty(&bo->swap)) {
 215                 list_del_init(&bo->swap);
 216                 ++put_count;
 217         }
 218         if (!list_empty(&bo->lru)) {
 219                 list_del_init(&bo->lru);
 220                 ++put_count;
 221         }
 222
 223         /*
 224          * TODO: Add a driver hook to delete from
 225          * driver-specific LRU's here.
 226          */
 227
 228         return put_count;
 229 }
 230
 231 int ttm_bo_reserve_locked(struct ttm_buffer_object *bo,
 232                           bool interruptible,
 233                           bool no_wait, bool use_sequence, uint32_t sequence)
 234 {
 235         struct ttm_bo_global *glob = bo->glob;
 236         int ret;
 237
 238         while (unlikely(atomic_cmpxchg(&bo->reserved, 0, 1) != 0)) {
 239                 if (use_sequence && bo->seq_valid &&
 240                         (sequence - bo->val_seq < (1 << 31))) {
 241                         return -EAGAIN;
 242                 }
 243
 244                 if (no_wait)
 245                         return -EBUSY;
 246
 247                 spin_unlock(&glob->lru_lock);
 248                 ret = ttm_bo_wait_unreserved(bo, interruptible);
 249                 spin_lock(&glob->lru_lock);
 250
 251                 if (unlikely(ret))
 252                         return ret;
 253         }
 254
 255         if (use_sequence) {
 256                 bo->val_seq = sequence;
 257                 bo->seq_valid = true;
 258         } else {
 259                 bo->seq_valid = false;
 260         }
 261
 262         return 0;
 263 }
 264 EXPORT_SYMBOL(ttm_bo_reserve);
 265
 266 static void ttm_bo_ref_bug(struct kref *list_kref)
 267 {
 268         BUG();
 269 }
 270
 271 int ttm_bo_reserve(struct ttm_buffer_object *bo,
 272                    bool interruptible,
 273                    bool no_wait, bool use_sequence, uint32_t sequence)
 274 {
 275         struct ttm_bo_global *glob = bo->glob;
 276         int put_count = 0;
 277         int ret;
 278
 279         spin_lock(&glob->lru_lock);
 280         ret = ttm_bo_reserve_locked(bo, interruptible, no_wait, use_sequence,
 281                                     sequence);
 282         if (likely(ret == 0))
 283                 put_count = ttm_bo_del_from_lru(bo);
 284         spin_unlock(&glob->lru_lock);
 285
 286         while (put_count--)
 287                 kref_put(&bo->list_kref, ttm_bo_ref_bug);
 288
 289         return ret;
 290 }
 291
 292 void ttm_bo_unreserve(struct ttm_buffer_object *bo)
 293 {
 294         struct ttm_bo_global *glob = bo->glob;
 295
 296         spin_lock(&glob->lru_lock);
 297         ttm_bo_add_to_lru(bo);
 298         atomic_set(&bo->reserved, 0);
 299         wake_up_all(&bo->event_queue);
 300         spin_unlock(&glob->lru_lock);
 301 }
 302 EXPORT_SYMBOL(ttm_bo_unreserve);
 303
 304 /*
 305  * Call bo->mutex locked.
 306  */
 307 static int ttm_bo_add_ttm(struct ttm_buffer_object *bo, bool zero_alloc)
 308 {
 309         struct ttm_bo_device *bdev = bo->bdev;
 310         struct ttm_bo_global *glob = bo->glob;
 311         int ret = 0;
 312         uint32_t page_flags = 0;
 313
 314         TTM_ASSERT_LOCKED(&bo->mutex);
 315         bo->ttm = NULL;
 316
 317         if (bdev->need_dma32)
 318                 page_flags |= TTM_PAGE_FLAG_DMA32;
 319
 320         switch (bo->type) {
 321         case ttm_bo_type_device:
 322                 if (zero_alloc)
 323                         page_flags |= TTM_PAGE_FLAG_ZERO_ALLOC;
 324         case ttm_bo_type_kernel:
 325                 bo->ttm = ttm_tt_create(bdev, bo->num_pages << PAGE_SHIFT,
 326                                         page_flags, glob->dummy_read_page);
 327                 if (unlikely(bo->ttm == NULL))
 328                         ret = -ENOMEM;
 329                 break;
 330         case ttm_bo_type_user:
 331                 bo->ttm = ttm_tt_create(bdev, bo->num_pages << PAGE_SHIFT,
 332                                         page_flags | TTM_PAGE_FLAG_USER,
 333                                         glob->dummy_read_page);
 334                 if (unlikely(bo->ttm == NULL)) {
 335                         ret = -ENOMEM;
 336                         break;
 337                 }
 338
 339                 ret = ttm_tt_set_user(bo->ttm, current,
 340                                       bo->buffer_start, bo->num_pages);
 341                 if (unlikely(ret != 0))
 342                         ttm_tt_destroy(bo->ttm);
 343                 break;
 344         default:
 345                 printk(KERN_ERR TTM_PFX "Illegal buffer object type\n");
 346                 ret = -EINVAL;
 347                 break;
 348         }
 349
 350         return ret;
 351 }
 352
 353 static int ttm_bo_handle_move_mem(struct ttm_buffer_object *bo,
 354                                   struct ttm_mem_reg *mem,
 355                                   bool evict, bool interruptible,
 356                                   bool no_wait_reserve, bool no_wait_gpu)
 357 {
 358         struct ttm_bo_device *bdev = bo->bdev;
 359         bool old_is_pci = ttm_mem_reg_is_pci(bdev, &bo->mem);
 360         bool new_is_pci = ttm_mem_reg_is_pci(bdev, mem);
 361         struct ttm_mem_type_manager *old_man = &bdev->man[bo->mem.mem_type];
 362         struct ttm_mem_type_manager *new_man = &bdev->man[mem->mem_type];
 363         int ret = 0;
 364
 365         if (old_is_pci || new_is_pci ||
 366             ((mem->placement & bo->mem.placement & TTM_PL_MASK_CACHING) == 0))
 367                 ttm_bo_unmap_virtual(bo);
 368
 369         /*
 370          * Create and bind a ttm if required.
 371          */
 372
 373         if (!(new_man->flags & TTM_MEMTYPE_FLAG_FIXED) && (bo->ttm == NULL)) {
 374                 ret = ttm_bo_add_ttm(bo, false);
 375                 if (ret)
 376                         goto out_err;
 377
 378                 ret = ttm_tt_set_placement_caching(bo->ttm, mem->placement);
 379                 if (ret)
 380                         goto out_err;
 381
 382                 if (mem->mem_type != TTM_PL_SYSTEM) {
 383                         ret = ttm_tt_bind(bo->ttm, mem);
 384                         if (ret)
 385                                 goto out_err;
 386                 }
 387
 388                 if (bo->mem.mem_type == TTM_PL_SYSTEM) {
 389                         bo->mem = *mem;
 390                         mem->mm_node = NULL;
 391                         goto moved;
 392                 }
 393
 394         }
 395
 396         if (bdev->driver->move_notify)
 397                 bdev->driver->move_notify(bo, mem);
 398
 399         if (!(old_man->flags & TTM_MEMTYPE_FLAG_FIXED) &&
 400             !(new_man->flags & TTM_MEMTYPE_FLAG_FIXED))
 401                 ret = ttm_bo_move_ttm(bo, evict, no_wait_reserve, no_wait_gpu, mem);
 402         else if (bdev->driver->move)
 403                 ret = bdev->driver->move(bo, evict, interruptible,
 404                                          no_wait_reserve, no_wait_gpu, mem);
 405         else
 406                 ret = ttm_bo_move_memcpy(bo, evict, no_wait_reserve, no_wait_gpu, mem);
 407
 408         if (ret)
 409                 goto out_err;
 410
 411 moved:
 412         if (bo->evicted) {
 413                 ret = bdev->driver->invalidate_caches(bdev, bo->mem.placement);
 414                 if (ret)
 415                         printk(KERN_ERR TTM_PFX "Can not flush read caches\n");
 416                 bo->evicted = false;
 417         }
 418
 419         if (bo->mem.mm_node) {
 420                 spin_lock(&bo->lock);
 421                 bo->offset = (bo->mem.start << PAGE_SHIFT) +
 422                     bdev->man[bo->mem.mem_type].gpu_offset;
 423                 bo->cur_placement = bo->mem.placement;
 424                 spin_unlock(&bo->lock);
 425         } else
 426                 bo->offset = 0;
 427
 428         return 0;
 429
 430 out_err:
 431         new_man = &bdev->man[bo->mem.mem_type];
 432         if ((new_man->flags & TTM_MEMTYPE_FLAG_FIXED) && bo->ttm) {
 433                 ttm_tt_unbind(bo->ttm);
 434                 ttm_tt_destroy(bo->ttm);
 435                 bo->ttm = NULL;
 436         }
 437
 438         return ret;
 439 }
 440
 441 /**
 442  * Call bo::reserved and with the lru lock held.
 443  * Will release GPU memory type usage on destruction.
 444  * This is the place to put in driver specific hooks.
 445  * Will release the bo::reserved lock and the
 446  * lru lock on exit.
 447  */
 448
 449 static void ttm_bo_cleanup_memtype_use(struct ttm_buffer_object *bo)
 450 {
 451         struct ttm_bo_global *glob = bo->glob;
 452
 453         if (bo->ttm) {
 454
 455                 /**
 456                  * Release the lru_lock, since we don't want to have
 457                  * an atomic requirement on ttm_tt[unbind|destroy].
 458                  */
 459
 460                 spin_unlock(&glob->lru_lock);
 461                 ttm_tt_unbind(bo->ttm);
 462                 ttm_tt_destroy(bo->ttm);
 463                 bo->ttm = NULL;
 464                 spin_lock(&glob->lru_lock);
 465         }
 466
 467         ttm_bo_mem_put_locked(bo, &bo->mem);
 468
 469         atomic_set(&bo->reserved, 0);
 470         wake_up_all(&bo->event_queue);
 471         spin_unlock(&glob->lru_lock);
 472 }
 473
 474
 475 /**
 476  * If bo idle, remove from delayed- and lru lists, and unref.
 477  * If not idle, and already on delayed list, do nothing.
 478  * If not idle, and not on delayed list, put on delayed list,
 479  *   up the list_kref and schedule a delayed list check.
 480  */
 481
 482 static int ttm_bo_cleanup_refs(struct ttm_buffer_object *bo, bool remove_all)
 483 {
 484         struct ttm_bo_device *bdev = bo->bdev;
 485         struct ttm_bo_global *glob = bo->glob;
 486         struct ttm_bo_driver *driver = bdev->driver;
 487         int ret;
 488
 489         spin_lock(&bo->lock);
 490 retry:
 491         (void) ttm_bo_wait(bo, false, false, !remove_all);
 492
 493         if (!bo->sync_obj) {
 494                 int put_count;
 495
 496                 spin_unlock(&bo->lock);
 497
 498                 spin_lock(&glob->lru_lock);
 499                 ret = ttm_bo_reserve_locked(bo, false, !remove_all, false, 0);
 500
 501                 /**
 502                  * Someone else has the object reserved. Bail and retry.
 503                  */
 504
 505                 if (unlikely(ret == -EBUSY)) {
 506                         spin_unlock(&glob->lru_lock);
 507                         spin_lock(&bo->lock);
 508                         goto requeue;
 509                 }
 510
 511                 /**
 512                  * We can re-check for sync object without taking
 513                  * the bo::lock since setting the sync object requires
 514                  * also bo::reserved. A busy object at this point may
 515                  * be caused by another thread starting an accelerated
 516                  * eviction.
 517                  */
 518
 519                 if (unlikely(bo->sync_obj)) {
 520                         atomic_set(&bo->reserved, 0);
 521                         wake_up_all(&bo->event_queue);
 522                         spin_unlock(&glob->lru_lock);
 523                         spin_lock(&bo->lock);
 524                         if (remove_all)
 525                                 goto retry;
 526                         else
 527                                 goto requeue;
 528                 }
 529
 530                 put_count = ttm_bo_del_from_lru(bo);
 531
 532                 if (!list_empty(&bo->ddestroy)) {
 533                         list_del_init(&bo->ddestroy);
 534                         ++put_count;
 535                 }
 536
 537                 ttm_bo_cleanup_memtype_use(bo);
 538
 539                 while (put_count--)
 540                         kref_put(&bo->list_kref, ttm_bo_ref_bug);
 541
 542                 return 0;
 543         }
 544 requeue:
 545         spin_lock(&glob->lru_lock);
 546         if (list_empty(&bo->ddestroy)) {
 547                 void *sync_obj = bo->sync_obj;
 548                 void *sync_obj_arg = bo->sync_obj_arg;
 549
 550                 kref_get(&bo->list_kref);
 551                 list_add_tail(&bo->ddestroy, &bdev->ddestroy);
 552                 spin_unlock(&glob->lru_lock);
 553                 spin_unlock(&bo->lock);
 554
 555                 if (sync_obj)
 556                         driver->sync_obj_flush(sync_obj, sync_obj_arg);
 557                 schedule_delayed_work(&bdev->wq,
 558                                       ((HZ / 100) < 1) ? 1 : HZ / 100);
 559                 ret = 0;
 560
 561         } else {
 562                 spin_unlock(&glob->lru_lock);
 563                 spin_unlock(&bo->lock);
 564                 ret = -EBUSY;
 565         }
 566
 567         return ret;
 568 }
 569
 570 /**
 571  * Traverse the delayed list, and call ttm_bo_cleanup_refs on all
 572  * encountered buffers.
 573  */
 574
 575 static int ttm_bo_delayed_delete(struct ttm_bo_device *bdev, bool remove_all)
 576 {
 577         struct ttm_bo_global *glob = bdev->glob;
 578         struct ttm_buffer_object *entry = NULL;
 579         int ret = 0;
 580
 581         spin_lock(&glob->lru_lock);
 582         if (list_empty(&bdev->ddestroy))
 583                 goto out_unlock;
 584
 585         entry = list_first_entry(&bdev->ddestroy,
 586                 struct ttm_buffer_object, ddestroy);
 587         kref_get(&entry->list_kref);
 588
 589         for (;;) {
 590                 struct ttm_buffer_object *nentry = NULL;
 591
 592                 if (entry->ddestroy.next != &bdev->ddestroy) {
 593                         nentry = list_first_entry(&entry->ddestroy,
 594                                 struct ttm_buffer_object, ddestroy);
 595                         kref_get(&nentry->list_kref);
 596                 }
 597
 598                 spin_unlock(&glob->lru_lock);
 599                 ret = ttm_bo_cleanup_refs(entry, remove_all);
 600                 kref_put(&entry->list_kref, ttm_bo_release_list);
 601                 entry = nentry;
 602
 603                 if (ret || !entry)
 604                         goto out;
 605
 606                 spin_lock(&glob->lru_lock);
 607                 if (list_empty(&entry->ddestroy))
 608                         break;
 609         }
 610
 611 out_unlock:
 612         spin_unlock(&glob->lru_lock);
 613 out:
 614         if (entry)
 615                 kref_put(&entry->list_kref, ttm_bo_release_list);
 616         return ret;
 617 }
 618
 619 static void ttm_bo_delayed_workqueue(struct work_struct *work)
 620 {
 621         struct ttm_bo_device *bdev =
 622             container_of(work, struct ttm_bo_device, wq.work);
 623
 624         if (ttm_bo_delayed_delete(bdev, false)) {
 625                 schedule_delayed_work(&bdev->wq,
 626                                       ((HZ / 100) < 1) ? 1 : HZ / 100);
 627         }
 628 }
 629
 630 static void ttm_bo_release(struct kref *kref)
 631 {
 632         struct ttm_buffer_object *bo =
 633             container_of(kref, struct ttm_buffer_object, kref);
 634         struct ttm_bo_device *bdev = bo->bdev;
 635
 636         if (likely(bo->vm_node != NULL)) {
 637                 rb_erase(&bo->vm_rb, &bdev->addr_space_rb);
 638                 drm_mm_put_block(bo->vm_node);
 639                 bo->vm_node = NULL;
 640         }
 641         write_unlock(&bdev->vm_lock);
 642         ttm_bo_cleanup_refs(bo, false);
 643         kref_put(&bo->list_kref, ttm_bo_release_list);
 644         write_lock(&bdev->vm_lock);
 645 }
 646
 647 void ttm_bo_unref(struct ttm_buffer_object **p_bo)
 648 {
 649         struct ttm_buffer_object *bo = *p_bo;
 650         struct ttm_bo_device *bdev = bo->bdev;
 651
 652         *p_bo = NULL;
 653         write_lock(&bdev->vm_lock);
 654         kref_put(&bo->kref, ttm_bo_release);
 655         write_unlock(&bdev->vm_lock);
 656 }
 657 EXPORT_SYMBOL(ttm_bo_unref);
 658
 659 int ttm_bo_lock_delayed_workqueue(struct ttm_bo_device *bdev)
 660 {
 661         return cancel_delayed_work_sync(&bdev->wq);
 662 }
 663 EXPORT_SYMBOL(ttm_bo_lock_delayed_workqueue);
 664
 665 void ttm_bo_unlock_delayed_workqueue(struct ttm_bo_device *bdev, int resched)
 666 {
 667         if (resched)
 668                 schedule_delayed_work(&bdev->wq,
 669                                       ((HZ / 100) < 1) ? 1 : HZ / 100);
 670 }
 671 EXPORT_SYMBOL(ttm_bo_unlock_delayed_workqueue);
 672
 673 static int ttm_bo_evict(struct ttm_buffer_object *bo, bool interruptible,
 674                         bool no_wait_reserve, bool no_wait_gpu)
 675 {
 676         struct ttm_bo_device *bdev = bo->bdev;
 677         struct ttm_mem_reg evict_mem;
 678         struct ttm_placement placement;
 679         int ret = 0;
 680
 681         spin_lock(&bo->lock);
 682         ret = ttm_bo_wait(bo, false, interruptible, no_wait_gpu);
 683         spin_unlock(&bo->lock);
 684
 685         if (unlikely(ret != 0)) {
 686                 if (ret != -ERESTARTSYS) {
 687                         printk(KERN_ERR TTM_PFX
 688                                "Failed to expire sync object before "
 689                                "buffer eviction.\n");
 690                 }
 691                 goto out;
 692         }
 693
 694         BUG_ON(!atomic_read(&bo->reserved));
 695
 696         evict_mem = bo->mem;
 697         evict_mem.mm_node = NULL;
 698         evict_mem.bus.io_reserved = false;
 699
 700         placement.fpfn = 0;
 701         placement.lpfn = 0;
 702         placement.num_placement = 0;
 703         placement.num_busy_placement = 0;
 704         bdev->driver->evict_flags(bo, &placement);
 705         ret = ttm_bo_mem_space(bo, &placement, &evict_mem, interruptible,
 706                                 no_wait_reserve, no_wait_gpu);
 707         if (ret) {
 708                 if (ret != -ERESTARTSYS) {
 709                         printk(KERN_ERR TTM_PFX
 710                                "Failed to find memory space for "
 711                                "buffer 0x%p eviction.\n", bo);
 712                         ttm_bo_mem_space_debug(bo, &placement);
 713                 }
 714                 goto out;
 715         }
 716
 717         ret = ttm_bo_handle_move_mem(bo, &evict_mem, true, interruptible,
 718                                      no_wait_reserve, no_wait_gpu);
 719         if (ret) {
 720                 if (ret != -ERESTARTSYS)
 721                         printk(KERN_ERR TTM_PFX "Buffer eviction failed\n");
 722                 ttm_bo_mem_put(bo, &evict_mem);
 723                 goto out;
 724         }
 725         bo->evicted = true;
 726 out:
 727         return ret;
 728 }
 729
 730 static int ttm_mem_evict_first(struct ttm_bo_device *bdev,
 731                                 uint32_t mem_type,
 732                                 bool interruptible, bool no_wait_reserve,
 733                                 bool no_wait_gpu)
 734 {
 735         struct ttm_bo_global *glob = bdev->glob;
 736         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
 737         struct ttm_buffer_object *bo;
 738         int ret, put_count = 0;
 739
 740 retry:
 741         spin_lock(&glob->lru_lock);
 742         if (list_empty(&man->lru)) {
 743                 spin_unlock(&glob->lru_lock);
 744                 return -EBUSY;
 745         }
 746
 747         bo = list_first_entry(&man->lru, struct ttm_buffer_object, lru);
 748         kref_get(&bo->list_kref);
 749
 750         ret = ttm_bo_reserve_locked(bo, false, no_wait_reserve, false, 0);
 751
 752         if (unlikely(ret == -EBUSY)) {
 753                 spin_unlock(&glob->lru_lock);
 754                 if (likely(!no_wait_gpu))
 755                         ret = ttm_bo_wait_unreserved(bo, interruptible);
 756
 757                 kref_put(&bo->list_kref, ttm_bo_release_list);
 758
 759                 /**
 760                  * We *need* to retry after releasing the lru lock.
 761                  */
 762
 763                 if (unlikely(ret != 0))
 764                         return ret;
 765                 goto retry;
 766         }
 767
 768         put_count = ttm_bo_del_from_lru(bo);
 769         spin_unlock(&glob->lru_lock);
 770
 771         BUG_ON(ret != 0);
 772
 773         while (put_count--)
 774                 kref_put(&bo->list_kref, ttm_bo_ref_bug);
 775
 776         ret = ttm_bo_evict(bo, interruptible, no_wait_reserve, no_wait_gpu);
 777         ttm_bo_unreserve(bo);
 778
 779         kref_put(&bo->list_kref, ttm_bo_release_list);
 780         return ret;
 781 }
 782
 783 void ttm_bo_mem_put(struct ttm_buffer_object *bo, struct ttm_mem_reg *mem)
 784 {
 785         struct ttm_mem_type_manager *man = &bo->bdev->man[mem->mem_type];
 786
 787         if (mem->mm_node)
 788                 (*man->func->put_node)(man, mem);
 789 }
 790 EXPORT_SYMBOL(ttm_bo_mem_put);
 791
 792 void ttm_bo_mem_put_locked(struct ttm_buffer_object *bo, struct ttm_mem_reg *mem)
 793 {
 794         struct ttm_mem_type_manager *man = &bo->bdev->man[mem->mem_type];
 795
 796         if (mem->mm_node)
 797                 (*man->func->put_node_locked)(man, mem);
 798 }
 799 EXPORT_SYMBOL(ttm_bo_mem_put_locked);
 800
 801 /**
 802  * Repeatedly evict memory from the LRU for @mem_type until we create enough
 803  * space, or we've evicted everything and there isn't enough space.
 804  */
 805 static int ttm_bo_mem_force_space(struct ttm_buffer_object *bo,
 806                                         uint32_t mem_type,
 807                                         struct ttm_placement *placement,
 808                                         struct ttm_mem_reg *mem,
 809                                         bool interruptible,
 810                                         bool no_wait_reserve,
 811                                         bool no_wait_gpu)
 812 {
 813         struct ttm_bo_device *bdev = bo->bdev;
 814         struct ttm_bo_global *glob = bdev->glob;
 815         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
 816         int ret;
 817
 818         do {
 819                 ret = (*man->func->get_node)(man, bo, placement, mem);
 820                 if (unlikely(ret != 0))
 821                         return ret;
 822                 if (mem->mm_node)
 823                         break;
 824                 spin_lock(&glob->lru_lock);
 825                 if (list_empty(&man->lru)) {
 826                         spin_unlock(&glob->lru_lock);
 827                         break;
 828                 }
 829                 spin_unlock(&glob->lru_lock);
 830                 ret = ttm_mem_evict_first(bdev, mem_type, interruptible,
 831                                                 no_wait_reserve, no_wait_gpu);
 832                 if (unlikely(ret != 0))
 833                         return ret;
 834         } while (1);
 835         if (mem->mm_node == NULL)
 836                 return -ENOMEM;
 837         mem->mem_type = mem_type;
 838         return 0;
 839 }
 840
 841 static uint32_t ttm_bo_select_caching(struct ttm_mem_type_manager *man,
 842                                       uint32_t cur_placement,
 843                                       uint32_t proposed_placement)
 844 {
 845         uint32_t caching = proposed_placement & TTM_PL_MASK_CACHING;
 846         uint32_t result = proposed_placement & ~TTM_PL_MASK_CACHING;
 847
 848         /**
 849          * Keep current caching if possible.
 850          */
 851
 852         if ((cur_placement & caching) != 0)
 853                 result |= (cur_placement & caching);
 854         else if ((man->default_caching & caching) != 0)
 855                 result |= man->default_caching;
 856         else if ((TTM_PL_FLAG_CACHED & caching) != 0)
 857                 result |= TTM_PL_FLAG_CACHED;
 858         else if ((TTM_PL_FLAG_WC & caching) != 0)
 859                 result |= TTM_PL_FLAG_WC;
 860         else if ((TTM_PL_FLAG_UNCACHED & caching) != 0)
 861                 result |= TTM_PL_FLAG_UNCACHED;
 862
 863         return result;
 864 }
 865
 866 static bool ttm_bo_mt_compatible(struct ttm_mem_type_manager *man,
 867                                  bool disallow_fixed,
 868                                  uint32_t mem_type,
 869                                  uint32_t proposed_placement,
 870                                  uint32_t *masked_placement)
 871 {
 872         uint32_t cur_flags = ttm_bo_type_flags(mem_type);
 873
 874         if ((man->flags & TTM_MEMTYPE_FLAG_FIXED) && disallow_fixed)
 875                 return false;
 876
 877         if ((cur_flags & proposed_placement & TTM_PL_MASK_MEM) == 0)
 878                 return false;
 879
 880         if ((proposed_placement & man->available_caching) == 0)
 881                 return false;
 882
 883         cur_flags |= (proposed_placement & man->available_caching);
 884
 885         *masked_placement = cur_flags;
 886         return true;
 887 }
 888
 889 /**
 890  * Creates space for memory region @mem according to its type.
 891  *
 892  * This function first searches for free space in compatible memory types in
 893  * the priority order defined by the driver.  If free space isn't found, then
 894  * ttm_bo_mem_force_space is attempted in priority order to evict and find
 895  * space.
 896  */
 897 int ttm_bo_mem_space(struct ttm_buffer_object *bo,
 898                         struct ttm_placement *placement,
 899                         struct ttm_mem_reg *mem,
 900                         bool interruptible, bool no_wait_reserve,
 901                         bool no_wait_gpu)
 902 {
 903         struct ttm_bo_device *bdev = bo->bdev;
 904         struct ttm_mem_type_manager *man;
 905         uint32_t mem_type = TTM_PL_SYSTEM;
 906         uint32_t cur_flags = 0;
 907         bool type_found = false;
 908         bool type_ok = false;
 909         bool has_erestartsys = false;
 910         int i, ret;
 911
 912         mem->mm_node = NULL;
 913         for (i = 0; i < placement->num_placement; ++i) {
 914                 ret = ttm_mem_type_from_flags(placement->placement[i],
 915                                                 &mem_type);
 916                 if (ret)
 917                         return ret;
 918                 man = &bdev->man[mem_type];
 919
 920                 type_ok = ttm_bo_mt_compatible(man,
 921                                                 bo->type == ttm_bo_type_user,
 922                                                 mem_type,
 923                                                 placement->placement[i],
 924                                                 &cur_flags);
 925
 926                 if (!type_ok)
 927                         continue;
 928
 929                 cur_flags = ttm_bo_select_caching(man, bo->mem.placement,
 930                                                   cur_flags);
 931                 /*
 932                  * Use the access and other non-mapping-related flag bits from
 933                  * the memory placement flags to the current flags
 934                  */
 935                 ttm_flag_masked(&cur_flags, placement->placement[i],
 936                                 ~TTM_PL_MASK_MEMTYPE);
 937
 938                 if (mem_type == TTM_PL_SYSTEM)
 939                         break;
 940
 941                 if (man->has_type && man->use_type) {
 942                         type_found = true;
 943                         ret = (*man->func->get_node)(man, bo, placement, mem);
 944                         if (unlikely(ret))
 945                                 return ret;
 946                 }
 947                 if (mem->mm_node)
 948                         break;
 949         }
 950
 951         if ((type_ok && (mem_type == TTM_PL_SYSTEM)) || mem->mm_node) {
 952                 mem->mem_type = mem_type;
 953                 mem->placement = cur_flags;
 954                 return 0;
 955         }
 956
 957         if (!type_found)
 958                 return -EINVAL;
 959
 960         for (i = 0; i < placement->num_busy_placement; ++i) {
 961                 ret = ttm_mem_type_from_flags(placement->busy_placement[i],
 962                                                 &mem_type);
 963                 if (ret)
 964                         return ret;
 965                 man = &bdev->man[mem_type];
 966                 if (!man->has_type)
 967                         continue;
 968                 if (!ttm_bo_mt_compatible(man,
 969                                                 bo->type == ttm_bo_type_user,
 970                                                 mem_type,
 971                                                 placement->busy_placement[i],
 972                                                 &cur_flags))
 973                         continue;
 974
 975                 cur_flags = ttm_bo_select_caching(man, bo->mem.placement,
 976                                                   cur_flags);
 977                 /*
 978                  * Use the access and other non-mapping-related flag bits from
 979                  * the memory placement flags to the current flags
 980                  */
 981                 ttm_flag_masked(&cur_flags, placement->busy_placement[i],
 982                                 ~TTM_PL_MASK_MEMTYPE);
 983
 984
 985                 if (mem_type == TTM_PL_SYSTEM) {
 986                         mem->mem_type = mem_type;
 987                         mem->placement = cur_flags;
 988                         mem->mm_node = NULL;
 989                         return 0;
 990                 }
 991
 992                 ret = ttm_bo_mem_force_space(bo, mem_type, placement, mem,
 993                                                 interruptible, no_wait_reserve, no_wait_gpu);
 994                 if (ret == 0 && mem->mm_node) {
 995                         mem->placement = cur_flags;
 996                         return 0;
 997                 }
 998                 if (ret == -ERESTARTSYS)
 999                         has_erestartsys = true;
1000         }
1001         ret = (has_erestartsys) ? -ERESTARTSYS : -ENOMEM;
1002         return ret;
1003 }
1004 EXPORT_SYMBOL(ttm_bo_mem_space);
1005
1006 int ttm_bo_wait_cpu(struct ttm_buffer_object *bo, bool no_wait)
1007 {
1008         if ((atomic_read(&bo->cpu_writers) > 0) && no_wait)
1009                 return -EBUSY;
1010
1011         return wait_event_interruptible(bo->event_queue,
1012                                         atomic_read(&bo->cpu_writers) == 0);
1013 }
1014 EXPORT_SYMBOL(ttm_bo_wait_cpu);
1015
1016 int ttm_bo_move_buffer(struct ttm_buffer_object *bo,
1017                         struct ttm_placement *placement,
1018                         bool interruptible, bool no_wait_reserve,
1019                         bool no_wait_gpu)
1020 {
1021         int ret = 0;
1022         struct ttm_mem_reg mem;
1023
1024         BUG_ON(!atomic_read(&bo->reserved));
1025
1026         /*
1027          * FIXME: It's possible to pipeline buffer moves.
1028          * Have the driver move function wait for idle when necessary,
1029          * instead of doing it here.
1030          */
1031         spin_lock(&bo->lock);
1032         ret = ttm_bo_wait(bo, false, interruptible, no_wait_gpu);
1033         spin_unlock(&bo->lock);
1034         if (ret)
1035                 return ret;
1036         mem.num_pages = bo->num_pages;
1037         mem.size = mem.num_pages << PAGE_SHIFT;
1038         mem.page_alignment = bo->mem.page_alignment;
1039         mem.bus.io_reserved = false;
1040         /*
1041          * Determine where to move the buffer.
1042          */
1043         ret = ttm_bo_mem_space(bo, placement, &mem, interruptible, no_wait_reserve, no_wait_gpu);
1044         if (ret)
1045                 goto out_unlock;
1046         ret = ttm_bo_handle_move_mem(bo, &mem, false, interruptible, no_wait_reserve, no_wait_gpu);
1047 out_unlock:
1048         if (ret && mem.mm_node)
1049                 ttm_bo_mem_put(bo, &mem);
1050         return ret;
1051 }
1052
1053 static int ttm_bo_mem_compat(struct ttm_placement *placement,
1054                              struct ttm_mem_reg *mem)
1055 {
1056         int i;
1057
1058         if (mem->mm_node && placement->lpfn != 0 &&
1059             (mem->start < placement->fpfn ||
1060              mem->start + mem->num_pages > placement->lpfn))
1061                 return -1;
1062
1063         for (i = 0; i < placement->num_placement; i++) {
1064                 if ((placement->placement[i] & mem->placement &
1065                         TTM_PL_MASK_CACHING) &&
1066                         (placement->placement[i] & mem->placement &
1067                         TTM_PL_MASK_MEM))
1068                         return i;
1069         }
1070         return -1;
1071 }
1072
1073 int ttm_bo_validate(struct ttm_buffer_object *bo,
1074                         struct ttm_placement *placement,
1075                         bool interruptible, bool no_wait_reserve,
1076                         bool no_wait_gpu)
1077 {
1078         int ret;
1079
1080         BUG_ON(!atomic_read(&bo->reserved));
1081         /* Check that range is valid */
1082         if (placement->lpfn || placement->fpfn)
1083                 if (placement->fpfn > placement->lpfn ||
1084                         (placement->lpfn - placement->fpfn) < bo->num_pages)
1085                         return -EINVAL;
1086         /*
1087          * Check whether we need to move buffer.
1088          */
1089         ret = ttm_bo_mem_compat(placement, &bo->mem);
1090         if (ret < 0) {
1091                 ret = ttm_bo_move_buffer(bo, placement, interruptible, no_wait_reserve, no_wait_gpu);
1092                 if (ret)
1093                         return ret;
1094         } else {
1095                 /*
1096                  * Use the access and other non-mapping-related flag bits from
1097                  * the compatible memory placement flags to the active flags
1098                  */
1099                 ttm_flag_masked(&bo->mem.placement, placement->placement[ret],
1100                                 ~TTM_PL_MASK_MEMTYPE);
1101         }
1102         /*
1103          * We might need to add a TTM.
1104          */
1105         if (bo->mem.mem_type == TTM_PL_SYSTEM && bo->ttm == NULL) {
1106                 ret = ttm_bo_add_ttm(bo, true);
1107                 if (ret)
1108                         return ret;
1109         }
1110         return 0;
1111 }
1112 EXPORT_SYMBOL(ttm_bo_validate);
1113
1114 int ttm_bo_check_placement(struct ttm_buffer_object *bo,
1115                                 struct ttm_placement *placement)
1116 {
1117         int i;
1118
1119         if (placement->fpfn || placement->lpfn) {
1120                 if (bo->mem.num_pages > (placement->lpfn - placement->fpfn)) {
1121                         printk(KERN_ERR TTM_PFX "Page number range to small "
1122                                 "Need %lu pages, range is [%u, %u]\n",
1123                                 bo->mem.num_pages, placement->fpfn,
1124                                 placement->lpfn);
1125                         return -EINVAL;
1126                 }
1127         }
1128         for (i = 0; i < placement->num_placement; i++) {
1129                 if (!capable(CAP_SYS_ADMIN)) {
1130                         if (placement->placement[i] & TTM_PL_FLAG_NO_EVICT) {
1131                                 printk(KERN_ERR TTM_PFX "Need to be root to "
1132                                         "modify NO_EVICT status.\n");
1133                                 return -EINVAL;
1134                         }
1135                 }
1136         }
1137         for (i = 0; i < placement->num_busy_placement; i++) {
1138                 if (!capable(CAP_SYS_ADMIN)) {
1139                         if (placement->busy_placement[i] & TTM_PL_FLAG_NO_EVICT) {
1140                                 printk(KERN_ERR TTM_PFX "Need to be root to "
1141                                         "modify NO_EVICT status.\n");
1142                                 return -EINVAL;
1143                         }
1144                 }
1145         }
1146         return 0;
1147 }
1148
1149 int ttm_bo_init(struct ttm_bo_device *bdev,
1150                 struct ttm_buffer_object *bo,
1151                 unsigned long size,
1152                 enum ttm_bo_type type,
1153                 struct ttm_placement *placement,
1154                 uint32_t page_alignment,
1155                 unsigned long buffer_start,
1156                 bool interruptible,
1157                 struct file *persistant_swap_storage,
1158                 size_t acc_size,
1159                 void (*destroy) (struct ttm_buffer_object *))
1160 {
1161         int ret = 0;
1162         unsigned long num_pages;
1163
1164         size += buffer_start & ~PAGE_MASK;
1165         num_pages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
1166         if (num_pages == 0) {
1167                 printk(KERN_ERR TTM_PFX "Illegal buffer object size.\n");
1168                 return -EINVAL;
1169         }
1170         bo->destroy = destroy;
1171
1172         spin_lock_init(&bo->lock);
1173         kref_init(&bo->kref);
1174         kref_init(&bo->list_kref);
1175         atomic_set(&bo->cpu_writers, 0);
1176         atomic_set(&bo->reserved, 1);
1177         init_waitqueue_head(&bo->event_queue);
1178         INIT_LIST_HEAD(&bo->lru);
1179         INIT_LIST_HEAD(&bo->ddestroy);
1180         INIT_LIST_HEAD(&bo->swap);
1181         bo->bdev = bdev;
1182         bo->glob = bdev->glob;
1183         bo->type = type;
1184         bo->num_pages = num_pages;
1185         bo->mem.size = num_pages << PAGE_SHIFT;
1186         bo->mem.mem_type = TTM_PL_SYSTEM;
1187         bo->mem.num_pages = bo->num_pages;
1188         bo->mem.mm_node = NULL;
1189         bo->mem.page_alignment = page_alignment;
1190         bo->mem.bus.io_reserved = false;
1191         bo->buffer_start = buffer_start & PAGE_MASK;
1192         bo->priv_flags = 0;
1193         bo->mem.placement = (TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED);
1194         bo->seq_valid = false;
1195         bo->persistant_swap_storage = persistant_swap_storage;
1196         bo->acc_size = acc_size;
1197         atomic_inc(&bo->glob->bo_count);
1198
1199         ret = ttm_bo_check_placement(bo, placement);
1200         if (unlikely(ret != 0))
1201                 goto out_err;
1202
1203         /*
1204          * For ttm_bo_type_device buffers, allocate
1205          * address space from the device.
1206          */
1207         if (bo->type == ttm_bo_type_device) {
1208                 ret = ttm_bo_setup_vm(bo);
1209                 if (ret)
1210                         goto out_err;
1211         }
1212
1213         ret = ttm_bo_validate(bo, placement, interruptible, false, false);
1214         if (ret)
1215                 goto out_err;
1216
1217         ttm_bo_unreserve(bo);
1218         return 0;
1219
1220 out_err:
1221         ttm_bo_unreserve(bo);
1222         ttm_bo_unref(&bo);
1223
1224         return ret;
1225 }
1226 EXPORT_SYMBOL(ttm_bo_init);
1227
1228 static inline size_t ttm_bo_size(struct ttm_bo_global *glob,
1229                                  unsigned long num_pages)
1230 {
1231         size_t page_array_size = (num_pages * sizeof(void *) + PAGE_SIZE - 1) &
1232             PAGE_MASK;
1233
1234         return glob->ttm_bo_size + 2 * page_array_size;
1235 }
1236
1237 int ttm_bo_create(struct ttm_bo_device *bdev,
1238                         unsigned long size,
1239                         enum ttm_bo_type type,
1240                         struct ttm_placement *placement,
1241                         uint32_t page_alignment,
1242                         unsigned long buffer_start,
1243                         bool interruptible,
1244                         struct file *persistant_swap_storage,
1245                         struct ttm_buffer_object **p_bo)
1246 {
1247         struct ttm_buffer_object *bo;
1248         struct ttm_mem_global *mem_glob = bdev->glob->mem_glob;
1249         int ret;
1250
1251         size_t acc_size =
1252             ttm_bo_size(bdev->glob, (size + PAGE_SIZE - 1) >> PAGE_SHIFT);
1253         ret = ttm_mem_global_alloc(mem_glob, acc_size, false, false);
1254         if (unlikely(ret != 0))
1255                 return ret;
1256
1257         bo = kzalloc(sizeof(*bo), GFP_KERNEL);
1258
1259         if (unlikely(bo == NULL)) {
1260                 ttm_mem_global_free(mem_glob, acc_size);
1261                 return -ENOMEM;
1262         }
1263
1264         ret = ttm_bo_init(bdev, bo, size, type, placement, page_alignment,
1265                                 buffer_start, interruptible,
1266                                 persistant_swap_storage, acc_size, NULL);
1267         if (likely(ret == 0))
1268                 *p_bo = bo;
1269
1270         return ret;
1271 }
1272
1273 static int ttm_bo_force_list_clean(struct ttm_bo_device *bdev,
1274                                         unsigned mem_type, bool allow_errors)
1275 {
1276         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
1277         struct ttm_bo_global *glob = bdev->glob;
1278         int ret;
1279
1280         /*
1281          * Can't use standard list traversal since we're unlocking.
1282          */
1283
1284         spin_lock(&glob->lru_lock);
1285         while (!list_empty(&man->lru)) {
1286                 spin_unlock(&glob->lru_lock);
1287                 ret = ttm_mem_evict_first(bdev, mem_type, false, false, false);
1288                 if (ret) {
1289                         if (allow_errors) {
1290                                 return ret;
1291                         } else {
1292                                 printk(KERN_ERR TTM_PFX
1293                                         "Cleanup eviction failed\n");
1294                         }
1295                 }
1296                 spin_lock(&glob->lru_lock);
1297         }
1298         spin_unlock(&glob->lru_lock);
1299         return 0;
1300 }
1301
1302 int ttm_bo_clean_mm(struct ttm_bo_device *bdev, unsigned mem_type)
1303 {
1304         struct ttm_mem_type_manager *man;
1305         int ret = -EINVAL;
1306
1307         if (mem_type >= TTM_NUM_MEM_TYPES) {
1308                 printk(KERN_ERR TTM_PFX "Illegal memory type %d\n", mem_type);
1309                 return ret;
1310         }
1311         man = &bdev->man[mem_type];
1312
1313         if (!man->has_type) {
1314                 printk(KERN_ERR TTM_PFX "Trying to take down uninitialized "
1315                        "memory manager type %u\n", mem_type);
1316                 return ret;
1317         }
1318
1319         man->use_type = false;
1320         man->has_type = false;
1321
1322         ret = 0;
1323         if (mem_type > 0) {
1324                 ttm_bo_force_list_clean(bdev, mem_type, false);
1325
1326                 ret = (*man->func->takedown)(man);
1327         }
1328
1329         return ret;
1330 }
1331 EXPORT_SYMBOL(ttm_bo_clean_mm);
1332
1333 int ttm_bo_evict_mm(struct ttm_bo_device *bdev, unsigned mem_type)
1334 {
1335         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
1336
1337         if (mem_type == 0 || mem_type >= TTM_NUM_MEM_TYPES) {
1338                 printk(KERN_ERR TTM_PFX
1339                        "Illegal memory manager memory type %u.\n",
1340                        mem_type);
1341                 return -EINVAL;
1342         }
1343
1344         if (!man->has_type) {
1345                 printk(KERN_ERR TTM_PFX
1346                        "Memory type %u has not been initialized.\n",
1347                        mem_type);
1348                 return 0;
1349         }
1350
1351         return ttm_bo_force_list_clean(bdev, mem_type, true);
1352 }
1353 EXPORT_SYMBOL(ttm_bo_evict_mm);
1354
1355 int ttm_bo_init_mm(struct ttm_bo_device *bdev, unsigned type,
1356                         unsigned long p_size)
1357 {
1358         int ret = -EINVAL;
1359         struct ttm_mem_type_manager *man;
1360
1361         if (type >= TTM_NUM_MEM_TYPES) {
1362                 printk(KERN_ERR TTM_PFX "Illegal memory type %d\n", type);
1363                 return ret;
1364         }
1365
1366         man = &bdev->man[type];
1367         if (man->has_type) {
1368                 printk(KERN_ERR TTM_PFX
1369                        "Memory manager already initialized for type %d\n",
1370                        type);
1371                 return ret;
1372         }
1373
1374         ret = bdev->driver->init_mem_type(bdev, type, man);
1375         if (ret)
1376                 return ret;
1377         man->bdev = bdev;
1378
1379         ret = 0;
1380         if (type != TTM_PL_SYSTEM) {
1381                 if (!p_size) {
1382                         printk(KERN_ERR TTM_PFX
1383                                "Zero size memory manager type %d\n",
1384                                type);
1385                         return ret;
1386                 }
1387
1388                 ret = (*man->func->init)(man, p_size);
1389                 if (ret)
1390                         return ret;
1391         }
1392         man->has_type = true;
1393         man->use_type = true;
1394         man->size = p_size;
1395
1396         INIT_LIST_HEAD(&man->lru);
1397
1398         return 0;
1399 }
1400 EXPORT_SYMBOL(ttm_bo_init_mm);
1401
1402 static void ttm_bo_global_kobj_release(struct kobject *kobj)
1403 {
1404         struct ttm_bo_global *glob =
1405                 container_of(kobj, struct ttm_bo_global, kobj);
1406
1407         ttm_mem_unregister_shrink(glob->mem_glob, &glob->shrink);
1408         __free_page(glob->dummy_read_page);
1409         kfree(glob);
1410 }
1411
1412 void ttm_bo_global_release(struct drm_global_reference *ref)
1413 {
1414         struct ttm_bo_global *glob = ref->object;
1415
1416         kobject_del(&glob->kobj);
1417         kobject_put(&glob->kobj);
1418 }
1419 EXPORT_SYMBOL(ttm_bo_global_release);
1420
1421 int ttm_bo_global_init(struct drm_global_reference *ref)
1422 {
1423         struct ttm_bo_global_ref *bo_ref =
1424                 container_of(ref, struct ttm_bo_global_ref, ref);
1425         struct ttm_bo_global *glob = ref->object;
1426         int ret;
1427
1428         mutex_init(&glob->device_list_mutex);
1429         spin_lock_init(&glob->lru_lock);
1430         glob->mem_glob = bo_ref->mem_glob;
1431         glob->dummy_read_page = alloc_page(__GFP_ZERO | GFP_DMA32);
1432
1433         if (unlikely(glob->dummy_read_page == NULL)) {
1434                 ret = -ENOMEM;
1435                 goto out_no_drp;
1436         }
1437
1438         INIT_LIST_HEAD(&glob->swap_lru);
1439         INIT_LIST_HEAD(&glob->device_list);
1440
1441         ttm_mem_init_shrink(&glob->shrink, ttm_bo_swapout);
1442         ret = ttm_mem_register_shrink(glob->mem_glob, &glob->shrink);
1443         if (unlikely(ret != 0)) {
1444                 printk(KERN_ERR TTM_PFX
1445                        "Could not register buffer object swapout.\n");
1446                 goto out_no_shrink;
1447         }
1448
1449         glob->ttm_bo_extra_size =
1450                 ttm_round_pot(sizeof(struct ttm_tt)) +
1451                 ttm_round_pot(sizeof(struct ttm_backend));
1452
1453         glob->ttm_bo_size = glob->ttm_bo_extra_size +
1454                 ttm_round_pot(sizeof(struct ttm_buffer_object));
1455
1456         atomic_set(&glob->bo_count, 0);
1457
1458         ret = kobject_init_and_add(
1459                 &glob->kobj, &ttm_bo_glob_kobj_type, ttm_get_kobj(), "buffer_objects");
1460         if (unlikely(ret != 0))
1461                 kobject_put(&glob->kobj);
1462         return ret;
1463 out_no_shrink:
1464         __free_page(glob->dummy_read_page);
1465 out_no_drp:
1466         kfree(glob);
1467         return ret;
1468 }
1469 EXPORT_SYMBOL(ttm_bo_global_init);
1470
1471
1472 int ttm_bo_device_release(struct ttm_bo_device *bdev)
1473 {
1474         int ret = 0;
1475         unsigned i = TTM_NUM_MEM_TYPES;
1476         struct ttm_mem_type_manager *man;
1477         struct ttm_bo_global *glob = bdev->glob;
1478
1479         while (i--) {
1480                 man = &bdev->man[i];
1481                 if (man->has_type) {
1482                         man->use_type = false;
1483                         if ((i != TTM_PL_SYSTEM) && ttm_bo_clean_mm(bdev, i)) {
1484                                 ret = -EBUSY;
1485                                 printk(KERN_ERR TTM_PFX
1486                                        "DRM memory manager type %d "
1487                                        "is not clean.\n", i);
1488                         }
1489                         man->has_type = false;
1490                 }
1491         }
1492
1493         mutex_lock(&glob->device_list_mutex);
1494         list_del(&bdev->device_list);
1495         mutex_unlock(&glob->device_list_mutex);
1496
1497         if (!cancel_delayed_work(&bdev->wq))
1498                 flush_scheduled_work();
1499
1500         while (ttm_bo_delayed_delete(bdev, true))
1501                 ;
1502
1503         spin_lock(&glob->lru_lock);
1504         if (list_empty(&bdev->ddestroy))
1505                 TTM_DEBUG("Delayed destroy list was clean\n");
1506
1507         if (list_empty(&bdev->man[0].lru))
1508                 TTM_DEBUG("Swap list was clean\n");
1509         spin_unlock(&glob->lru_lock);
1510
1511         BUG_ON(!drm_mm_clean(&bdev->addr_space_mm));
1512         write_lock(&bdev->vm_lock);
1513         drm_mm_takedown(&bdev->addr_space_mm);
1514         write_unlock(&bdev->vm_lock);
1515
1516         return ret;
1517 }
1518 EXPORT_SYMBOL(ttm_bo_device_release);
1519
1520 int ttm_bo_device_init(struct ttm_bo_device *bdev,
1521                        struct ttm_bo_global *glob,
1522                        struct ttm_bo_driver *driver,
1523                        uint64_t file_page_offset,
1524                        bool need_dma32)
1525 {
1526         int ret = -EINVAL;
1527
1528         rwlock_init(&bdev->vm_lock);
1529         bdev->driver = driver;
1530
1531         memset(bdev->man, 0, sizeof(bdev->man));
1532
1533         /*
1534          * Initialize the system memory buffer type.
1535          * Other types need to be driver / IOCTL initialized.
1536          */
1537         ret = ttm_bo_init_mm(bdev, TTM_PL_SYSTEM, 0);
1538         if (unlikely(ret != 0))
1539                 goto out_no_sys;
1540
1541         bdev->addr_space_rb = RB_ROOT;
1542         ret = drm_mm_init(&bdev->addr_space_mm, file_page_offset, 0x10000000);
1543         if (unlikely(ret != 0))
1544                 goto out_no_addr_mm;
1545
1546         INIT_DELAYED_WORK(&bdev->wq, ttm_bo_delayed_workqueue);
1547         bdev->nice_mode = true;
1548         INIT_LIST_HEAD(&bdev->ddestroy);
1549         bdev->dev_mapping = NULL;
1550         bdev->glob = glob;
1551         bdev->need_dma32 = need_dma32;
1552
1553         mutex_lock(&glob->device_list_mutex);
1554         list_add_tail(&bdev->device_list, &glob->device_list);
1555         mutex_unlock(&glob->device_list_mutex);
1556
1557         return 0;
1558 out_no_addr_mm:
1559         ttm_bo_clean_mm(bdev, 0);
1560 out_no_sys:
1561         return ret;
1562 }
1563 EXPORT_SYMBOL(ttm_bo_device_init);
1564
1565 /*
1566  * buffer object vm functions.
1567  */
1568
1569 bool ttm_mem_reg_is_pci(struct ttm_bo_device *bdev, struct ttm_mem_reg *mem)
1570 {
1571         struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
1572
1573         if (!(man->flags & TTM_MEMTYPE_FLAG_FIXED)) {
1574                 if (mem->mem_type == TTM_PL_SYSTEM)
1575                         return false;
1576
1577                 if (man->flags & TTM_MEMTYPE_FLAG_CMA)
1578                         return false;
1579
1580                 if (mem->placement & TTM_PL_FLAG_CACHED)
1581                         return false;
1582         }
1583         return true;
1584 }
1585
1586 void ttm_bo_unmap_virtual(struct ttm_buffer_object *bo)
1587 {
1588         struct ttm_bo_device *bdev = bo->bdev;
1589         loff_t offset = (loff_t) bo->addr_space_offset;
1590         loff_t holelen = ((loff_t) bo->mem.num_pages) << PAGE_SHIFT;
1591
1592         if (!bdev->dev_mapping)
1593                 return;
1594         unmap_mapping_range(bdev->dev_mapping, offset, holelen, 1);
1595         ttm_mem_io_free(bdev, &bo->mem);
1596 }
1597 EXPORT_SYMBOL(ttm_bo_unmap_virtual);
1598
1599 static void ttm_bo_vm_insert_rb(struct ttm_buffer_object *bo)
1600 {
1601         struct ttm_bo_device *bdev = bo->bdev;
1602         struct rb_node **cur = &bdev->addr_space_rb.rb_node;
1603         struct rb_node *parent = NULL;
1604         struct ttm_buffer_object *cur_bo;
1605         unsigned long offset = bo->vm_node->start;
1606         unsigned long cur_offset;
1607
1608         while (*cur) {
1609                 parent = *cur;
1610                 cur_bo = rb_entry(parent, struct ttm_buffer_object, vm_rb);
1611                 cur_offset = cur_bo->vm_node->start;
1612                 if (offset < cur_offset)
1613                         cur = &parent->rb_left;
1614                 else if (offset > cur_offset)
1615                         cur = &parent->rb_right;
1616                 else
1617                         BUG();
1618         }
1619
1620         rb_link_node(&bo->vm_rb, parent, cur);
1621         rb_insert_color(&bo->vm_rb, &bdev->addr_space_rb);
1622 }
1623
1624 /**
1625  * ttm_bo_setup_vm:
1626  *
1627  * @bo: the buffer to allocate address space for
1628  *
1629  * Allocate address space in the drm device so that applications
1630  * can mmap the buffer and access the contents. This only
1631  * applies to ttm_bo_type_device objects as others are not
1632  * placed in the drm device address space.
1633  */
1634
1635 static int ttm_bo_setup_vm(struct ttm_buffer_object *bo)
1636 {
1637         struct ttm_bo_device *bdev = bo->bdev;
1638         int ret;
1639
1640 retry_pre_get:
1641         ret = drm_mm_pre_get(&bdev->addr_space_mm);
1642         if (unlikely(ret != 0))
1643                 return ret;
1644
1645         write_lock(&bdev->vm_lock);
1646         bo->vm_node = drm_mm_search_free(&bdev->addr_space_mm,
1647                                          bo->mem.num_pages, 0, 0);
1648
1649         if (unlikely(bo->vm_node == NULL)) {
1650                 ret = -ENOMEM;
1651                 goto out_unlock;
1652         }
1653
1654         bo->vm_node = drm_mm_get_block_atomic(bo->vm_node,
1655                                               bo->mem.num_pages, 0);
1656
1657         if (unlikely(bo->vm_node == NULL)) {
1658                 write_unlock(&bdev->vm_lock);
1659                 goto retry_pre_get;
1660         }
1661
1662         ttm_bo_vm_insert_rb(bo);
1663         write_unlock(&bdev->vm_lock);
1664         bo->addr_space_offset = ((uint64_t) bo->vm_node->start) << PAGE_SHIFT;
1665
1666         return 0;
1667 out_unlock:
1668         write_unlock(&bdev->vm_lock);
1669         return ret;
1670 }
1671
1672 int ttm_bo_wait(struct ttm_buffer_object *bo,
1673                 bool lazy, bool interruptible, bool no_wait)
1674 {
1675         struct ttm_bo_driver *driver = bo->bdev->driver;
1676         void *sync_obj;
1677         void *sync_obj_arg;
1678         int ret = 0;
1679
1680         if (likely(bo->sync_obj == NULL))
1681                 return 0;
1682
1683         while (bo->sync_obj) {
1684
1685                 if (driver->sync_obj_signaled(bo->sync_obj, bo->sync_obj_arg)) {
1686                         void *tmp_obj = bo->sync_obj;
1687                         bo->sync_obj = NULL;
1688                         clear_bit(TTM_BO_PRIV_FLAG_MOVING, &bo->priv_flags);
1689                         spin_unlock(&bo->lock);
1690                         driver->sync_obj_unref(&tmp_obj);
1691                         spin_lock(&bo->lock);
1692                         continue;
1693                 }
1694
1695                 if (no_wait)
1696                         return -EBUSY;
1697
1698                 sync_obj = driver->sync_obj_ref(bo->sync_obj);
1699                 sync_obj_arg = bo->sync_obj_arg;
1700                 spin_unlock(&bo->lock);
1701                 ret = driver->sync_obj_wait(sync_obj, sync_obj_arg,
1702                                             lazy, interruptible);
1703                 if (unlikely(ret != 0)) {
1704                         driver->sync_obj_unref(&sync_obj);
1705                         spin_lock(&bo->lock);
1706                         return ret;
1707                 }
1708                 spin_lock(&bo->lock);
1709                 if (likely(bo->sync_obj == sync_obj &&
1710                            bo->sync_obj_arg == sync_obj_arg)) {
1711                         void *tmp_obj = bo->sync_obj;
1712                         bo->sync_obj = NULL;
1713                         clear_bit(TTM_BO_PRIV_FLAG_MOVING,
1714                                   &bo->priv_flags);
1715                         spin_unlock(&bo->lock);
1716                         driver->sync_obj_unref(&sync_obj);
1717                         driver->sync_obj_unref(&tmp_obj);
1718                         spin_lock(&bo->lock);
1719                 } else {
1720                         spin_unlock(&bo->lock);
1721                         driver->sync_obj_unref(&sync_obj);
1722                         spin_lock(&bo->lock);
1723                 }
1724         }
1725         return 0;
1726 }
1727 EXPORT_SYMBOL(ttm_bo_wait);
1728
1729 int ttm_bo_synccpu_write_grab(struct ttm_buffer_object *bo, bool no_wait)
1730 {
1731         int ret = 0;
1732
1733         /*
1734          * Using ttm_bo_reserve makes sure the lru lists are updated.
1735          */
1736
1737         ret = ttm_bo_reserve(bo, true, no_wait, false, 0);
1738         if (unlikely(ret != 0))
1739                 return ret;
1740         spin_lock(&bo->lock);
1741         ret = ttm_bo_wait(bo, false, true, no_wait);
1742         spin_unlock(&bo->lock);
1743         if (likely(ret == 0))
1744                 atomic_inc(&bo->cpu_writers);
1745         ttm_bo_unreserve(bo);
1746         return ret;
1747 }
1748 EXPORT_SYMBOL(ttm_bo_synccpu_write_grab);
1749
1750 void ttm_bo_synccpu_write_release(struct ttm_buffer_object *bo)
1751 {
1752         if (atomic_dec_and_test(&bo->cpu_writers))
1753                 wake_up_all(&bo->event_queue);
1754 }
1755 EXPORT_SYMBOL(ttm_bo_synccpu_write_release);
1756
1757 /**
1758  * A buffer object shrink method that tries to swap out the first
1759  * buffer object on the bo_global::swap_lru list.
1760  */
1761
1762 static int ttm_bo_swapout(struct ttm_mem_shrink *shrink)
1763 {
1764         struct ttm_bo_global *glob =
1765             container_of(shrink, struct ttm_bo_global, shrink);
1766         struct ttm_buffer_object *bo;
1767         int ret = -EBUSY;
1768         int put_count;
1769         uint32_t swap_placement = (TTM_PL_FLAG_CACHED | TTM_PL_FLAG_SYSTEM);
1770
1771         spin_lock(&glob->lru_lock);
1772         while (ret == -EBUSY) {
1773                 if (unlikely(list_empty(&glob->swap_lru))) {
1774                         spin_unlock(&glob->lru_lock);
1775                         return -EBUSY;
1776                 }
1777
1778                 bo = list_first_entry(&glob->swap_lru,
1779                                       struct ttm_buffer_object, swap);
1780                 kref_get(&bo->list_kref);
1781
1782                 /**
1783                  * Reserve buffer. Since we unlock while sleeping, we need
1784                  * to re-check that nobody removed us from the swap-list while
1785                  * we slept.
1786                  */
1787
1788                 ret = ttm_bo_reserve_locked(bo, false, true, false, 0);
1789                 if (unlikely(ret == -EBUSY)) {
1790                         spin_unlock(&glob->lru_lock);
1791                         ttm_bo_wait_unreserved(bo, false);
1792                         kref_put(&bo->list_kref, ttm_bo_release_list);
1793                         spin_lock(&glob->lru_lock);
1794                 }
1795         }
1796
1797         BUG_ON(ret != 0);
1798         put_count = ttm_bo_del_from_lru(bo);
1799         spin_unlock(&glob->lru_lock);
1800
1801         while (put_count--)
1802                 kref_put(&bo->list_kref, ttm_bo_ref_bug);
1803
1804         /**
1805          * Wait for GPU, then move to system cached.
1806          */
1807
1808         spin_lock(&bo->lock);
1809         ret = ttm_bo_wait(bo, false, false, false);
1810         spin_unlock(&bo->lock);
1811
1812         if (unlikely(ret != 0))
1813                 goto out;
1814
1815         if ((bo->mem.placement & swap_placement) != swap_placement) {
1816                 struct ttm_mem_reg evict_mem;
1817
1818                 evict_mem = bo->mem;
1819                 evict_mem.mm_node = NULL;
1820                 evict_mem.placement = TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED;
1821                 evict_mem.mem_type = TTM_PL_SYSTEM;
1822
1823                 ret = ttm_bo_handle_move_mem(bo, &evict_mem, true,
1824                                              false, false, false);
1825                 if (unlikely(ret != 0))
1826                         goto out;
1827         }
1828
1829         ttm_bo_unmap_virtual(bo);
1830
1831         /**
1832          * Swap out. Buffer will be swapped in again as soon as
1833          * anyone tries to access a ttm page.
1834          */
1835
1836         if (bo->bdev->driver->swap_notify)
1837                 bo->bdev->driver->swap_notify(bo);
1838
1839         ret = ttm_tt_swapout(bo->ttm, bo->persistant_swap_storage);
1840 out:
1841
1842         /**
1843          *
1844          * Unreserve without putting on LRU to avoid swapping out an
1845          * already swapped buffer.
1846          */
1847
1848         atomic_set(&bo->reserved, 0);
1849         wake_up_all(&bo->event_queue);
1850         kref_put(&bo->list_kref, ttm_bo_release_list);
1851         return ret;
1852 }
1853
1854 void ttm_bo_swapout_all(struct ttm_bo_device *bdev)
1855 {
1856         while (ttm_bo_swapout(&bdev->glob->shrink) == 0)
1857                 ;
1858 }
1859 EXPORT_SYMBOL(ttm_bo_swapout_all);