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                         drm_mm_put_block(bo->mem.mm_node);
 480                         bo->mem.mm_node = NULL;
 481                 }
 482                 spin_unlock(&glob->lru_lock);
 483
 484                 atomic_set(&bo->reserved, 0);
 485
 486                 while (put_count--)
 487                         kref_put(&bo->list_kref, ttm_bo_ref_bug);
 488
 489                 return 0;
 490         }
 491
 492         spin_lock(&glob->lru_lock);
 493         if (list_empty(&bo->ddestroy)) {
 494                 void *sync_obj = bo->sync_obj;
 495                 void *sync_obj_arg = bo->sync_obj_arg;
 496
 497                 kref_get(&bo->list_kref);
 498                 list_add_tail(&bo->ddestroy, &bdev->ddestroy);
 499                 spin_unlock(&glob->lru_lock);
 500                 spin_unlock(&bo->lock);
 501
 502                 if (sync_obj)
 503                         driver->sync_obj_flush(sync_obj, sync_obj_arg);
 504                 schedule_delayed_work(&bdev->wq,
 505                                       ((HZ / 100) < 1) ? 1 : HZ / 100);
 506                 ret = 0;
 507
 508         } else {
 509                 spin_unlock(&glob->lru_lock);
 510                 spin_unlock(&bo->lock);
 511                 ret = -EBUSY;
 512         }
 513
 514         return ret;
 515 }
 516
 517 /**
 518  * Traverse the delayed list, and call ttm_bo_cleanup_refs on all
 519  * encountered buffers.
 520  */
 521
 522 static int ttm_bo_delayed_delete(struct ttm_bo_device *bdev, bool remove_all)
 523 {
 524         struct ttm_bo_global *glob = bdev->glob;
 525         struct ttm_buffer_object *entry = NULL;
 526         int ret = 0;
 527
 528         spin_lock(&glob->lru_lock);
 529         if (list_empty(&bdev->ddestroy))
 530                 goto out_unlock;
 531
 532         entry = list_first_entry(&bdev->ddestroy,
 533                 struct ttm_buffer_object, ddestroy);
 534         kref_get(&entry->list_kref);
 535
 536         for (;;) {
 537                 struct ttm_buffer_object *nentry = NULL;
 538
 539                 if (entry->ddestroy.next != &bdev->ddestroy) {
 540                         nentry = list_first_entry(&entry->ddestroy,
 541                                 struct ttm_buffer_object, ddestroy);
 542                         kref_get(&nentry->list_kref);
 543                 }
 544
 545                 spin_unlock(&glob->lru_lock);
 546                 ret = ttm_bo_cleanup_refs(entry, remove_all);
 547                 kref_put(&entry->list_kref, ttm_bo_release_list);
 548                 entry = nentry;
 549
 550                 if (ret || !entry)
 551                         goto out;
 552
 553                 spin_lock(&glob->lru_lock);
 554                 if (list_empty(&entry->ddestroy))
 555                         break;
 556         }
 557
 558 out_unlock:
 559         spin_unlock(&glob->lru_lock);
 560 out:
 561         if (entry)
 562                 kref_put(&entry->list_kref, ttm_bo_release_list);
 563         return ret;
 564 }
 565
 566 static void ttm_bo_delayed_workqueue(struct work_struct *work)
 567 {
 568         struct ttm_bo_device *bdev =
 569             container_of(work, struct ttm_bo_device, wq.work);
 570
 571         if (ttm_bo_delayed_delete(bdev, false)) {
 572                 schedule_delayed_work(&bdev->wq,
 573                                       ((HZ / 100) < 1) ? 1 : HZ / 100);
 574         }
 575 }
 576
 577 static void ttm_bo_release(struct kref *kref)
 578 {
 579         struct ttm_buffer_object *bo =
 580             container_of(kref, struct ttm_buffer_object, kref);
 581         struct ttm_bo_device *bdev = bo->bdev;
 582
 583         if (likely(bo->vm_node != NULL)) {
 584                 rb_erase(&bo->vm_rb, &bdev->addr_space_rb);
 585                 drm_mm_put_block(bo->vm_node);
 586                 bo->vm_node = NULL;
 587         }
 588         write_unlock(&bdev->vm_lock);
 589         ttm_bo_cleanup_refs(bo, false);
 590         kref_put(&bo->list_kref, ttm_bo_release_list);
 591         write_lock(&bdev->vm_lock);
 592 }
 593
 594 void ttm_bo_unref(struct ttm_buffer_object **p_bo)
 595 {
 596         struct ttm_buffer_object *bo = *p_bo;
 597         struct ttm_bo_device *bdev = bo->bdev;
 598
 599         *p_bo = NULL;
 600         write_lock(&bdev->vm_lock);
 601         kref_put(&bo->kref, ttm_bo_release);
 602         write_unlock(&bdev->vm_lock);
 603 }
 604 EXPORT_SYMBOL(ttm_bo_unref);
 605
 606 int ttm_bo_lock_delayed_workqueue(struct ttm_bo_device *bdev)
 607 {
 608         return cancel_delayed_work_sync(&bdev->wq);
 609 }
 610 EXPORT_SYMBOL(ttm_bo_lock_delayed_workqueue);
 611
 612 void ttm_bo_unlock_delayed_workqueue(struct ttm_bo_device *bdev, int resched)
 613 {
 614         if (resched)
 615                 schedule_delayed_work(&bdev->wq,
 616                                       ((HZ / 100) < 1) ? 1 : HZ / 100);
 617 }
 618 EXPORT_SYMBOL(ttm_bo_unlock_delayed_workqueue);
 619
 620 static int ttm_bo_evict(struct ttm_buffer_object *bo, bool interruptible,
 621                         bool no_wait_reserve, bool no_wait_gpu)
 622 {
 623         struct ttm_bo_device *bdev = bo->bdev;
 624         struct ttm_bo_global *glob = bo->glob;
 625         struct ttm_mem_reg evict_mem;
 626         struct ttm_placement placement;
 627         int ret = 0;
 628
 629         spin_lock(&bo->lock);
 630         ret = ttm_bo_wait(bo, false, interruptible, no_wait_gpu);
 631         spin_unlock(&bo->lock);
 632
 633         if (unlikely(ret != 0)) {
 634                 if (ret != -ERESTARTSYS) {
 635                         printk(KERN_ERR TTM_PFX
 636                                "Failed to expire sync object before "
 637                                "buffer eviction.\n");
 638                 }
 639                 goto out;
 640         }
 641
 642         BUG_ON(!atomic_read(&bo->reserved));
 643
 644         evict_mem = bo->mem;
 645         evict_mem.mm_node = NULL;
 646         evict_mem.bus.io_reserved = false;
 647
 648         placement.fpfn = 0;
 649         placement.lpfn = 0;
 650         placement.num_placement = 0;
 651         placement.num_busy_placement = 0;
 652         bdev->driver->evict_flags(bo, &placement);
 653         ret = ttm_bo_mem_space(bo, &placement, &evict_mem, interruptible,
 654                                 no_wait_reserve, no_wait_gpu);
 655         if (ret) {
 656                 if (ret != -ERESTARTSYS) {
 657                         printk(KERN_ERR TTM_PFX
 658                                "Failed to find memory space for "
 659                                "buffer 0x%p eviction.\n", bo);
 660                         ttm_bo_mem_space_debug(bo, &placement);
 661                 }
 662                 goto out;
 663         }
 664
 665         ret = ttm_bo_handle_move_mem(bo, &evict_mem, true, interruptible,
 666                                      no_wait_reserve, no_wait_gpu);
 667         if (ret) {
 668                 if (ret != -ERESTARTSYS)
 669                         printk(KERN_ERR TTM_PFX "Buffer eviction failed\n");
 670                 spin_lock(&glob->lru_lock);
 671                 if (evict_mem.mm_node) {
 672                         drm_mm_put_block(evict_mem.mm_node);
 673                         evict_mem.mm_node = NULL;
 674                 }
 675                 spin_unlock(&glob->lru_lock);
 676                 goto out;
 677         }
 678         bo->evicted = true;
 679 out:
 680         return ret;
 681 }
 682
 683 static int ttm_mem_evict_first(struct ttm_bo_device *bdev,
 684                                 uint32_t mem_type,
 685                                 bool interruptible, bool no_wait_reserve,
 686                                 bool no_wait_gpu)
 687 {
 688         struct ttm_bo_global *glob = bdev->glob;
 689         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
 690         struct ttm_buffer_object *bo;
 691         int ret, put_count = 0;
 692
 693 retry:
 694         spin_lock(&glob->lru_lock);
 695         if (list_empty(&man->lru)) {
 696                 spin_unlock(&glob->lru_lock);
 697                 return -EBUSY;
 698         }
 699
 700         bo = list_first_entry(&man->lru, struct ttm_buffer_object, lru);
 701         kref_get(&bo->list_kref);
 702
 703         ret = ttm_bo_reserve_locked(bo, false, no_wait_reserve, false, 0);
 704
 705         if (unlikely(ret == -EBUSY)) {
 706                 spin_unlock(&glob->lru_lock);
 707                 if (likely(!no_wait_gpu))
 708                         ret = ttm_bo_wait_unreserved(bo, interruptible);
 709
 710                 kref_put(&bo->list_kref, ttm_bo_release_list);
 711
 712                 /**
 713                  * We *need* to retry after releasing the lru lock.
 714                  */
 715
 716                 if (unlikely(ret != 0))
 717                         return ret;
 718                 goto retry;
 719         }
 720
 721         put_count = ttm_bo_del_from_lru(bo);
 722         spin_unlock(&glob->lru_lock);
 723
 724         BUG_ON(ret != 0);
 725
 726         while (put_count--)
 727                 kref_put(&bo->list_kref, ttm_bo_ref_bug);
 728
 729         ret = ttm_bo_evict(bo, interruptible, no_wait_reserve, no_wait_gpu);
 730         ttm_bo_unreserve(bo);
 731
 732         kref_put(&bo->list_kref, ttm_bo_release_list);
 733         return ret;
 734 }
 735
 736 static int ttm_bo_man_get_node(struct ttm_buffer_object *bo,
 737                                 struct ttm_mem_type_manager *man,
 738                                 struct ttm_placement *placement,
 739                                 struct ttm_mem_reg *mem,
 740                                 struct drm_mm_node **node)
 741 {
 742         struct ttm_bo_global *glob = bo->glob;
 743         unsigned long lpfn;
 744         int ret;
 745
 746         lpfn = placement->lpfn;
 747         if (!lpfn)
 748                 lpfn = man->size;
 749         *node = NULL;
 750         do {
 751                 ret = drm_mm_pre_get(&man->manager);
 752                 if (unlikely(ret))
 753                         return ret;
 754
 755                 spin_lock(&glob->lru_lock);
 756                 *node = drm_mm_search_free_in_range(&man->manager,
 757                                         mem->num_pages, mem->page_alignment,
 758                                         placement->fpfn, lpfn, 1);
 759                 if (unlikely(*node == NULL)) {
 760                         spin_unlock(&glob->lru_lock);
 761                         return 0;
 762                 }
 763                 *node = drm_mm_get_block_atomic_range(*node, mem->num_pages,
 764                                                         mem->page_alignment,
 765                                                         placement->fpfn,
 766                                                         lpfn);
 767                 spin_unlock(&glob->lru_lock);
 768         } while (*node == NULL);
 769         return 0;
 770 }
 771
 772 /**
 773  * Repeatedly evict memory from the LRU for @mem_type until we create enough
 774  * space, or we've evicted everything and there isn't enough space.
 775  */
 776 static int ttm_bo_mem_force_space(struct ttm_buffer_object *bo,
 777                                         uint32_t mem_type,
 778                                         struct ttm_placement *placement,
 779                                         struct ttm_mem_reg *mem,
 780                                         bool interruptible,
 781                                         bool no_wait_reserve,
 782                                         bool no_wait_gpu)
 783 {
 784         struct ttm_bo_device *bdev = bo->bdev;
 785         struct ttm_bo_global *glob = bdev->glob;
 786         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
 787         struct drm_mm_node *node;
 788         int ret;
 789
 790         do {
 791                 ret = ttm_bo_man_get_node(bo, man, placement, mem, &node);
 792                 if (unlikely(ret != 0))
 793                         return ret;
 794                 if (node)
 795                         break;
 796                 spin_lock(&glob->lru_lock);
 797                 if (list_empty(&man->lru)) {
 798                         spin_unlock(&glob->lru_lock);
 799                         break;
 800                 }
 801                 spin_unlock(&glob->lru_lock);
 802                 ret = ttm_mem_evict_first(bdev, mem_type, interruptible,
 803                                                 no_wait_reserve, no_wait_gpu);
 804                 if (unlikely(ret != 0))
 805                         return ret;
 806         } while (1);
 807         if (node == NULL)
 808                 return -ENOMEM;
 809         mem->mm_node = node;
 810         mem->mem_type = mem_type;
 811         return 0;
 812 }
 813
 814 static uint32_t ttm_bo_select_caching(struct ttm_mem_type_manager *man,
 815                                       uint32_t cur_placement,
 816                                       uint32_t proposed_placement)
 817 {
 818         uint32_t caching = proposed_placement & TTM_PL_MASK_CACHING;
 819         uint32_t result = proposed_placement & ~TTM_PL_MASK_CACHING;
 820
 821         /**
 822          * Keep current caching if possible.
 823          */
 824
 825         if ((cur_placement & caching) != 0)
 826                 result |= (cur_placement & caching);
 827         else if ((man->default_caching & caching) != 0)
 828                 result |= man->default_caching;
 829         else if ((TTM_PL_FLAG_CACHED & caching) != 0)
 830                 result |= TTM_PL_FLAG_CACHED;
 831         else if ((TTM_PL_FLAG_WC & caching) != 0)
 832                 result |= TTM_PL_FLAG_WC;
 833         else if ((TTM_PL_FLAG_UNCACHED & caching) != 0)
 834                 result |= TTM_PL_FLAG_UNCACHED;
 835
 836         return result;
 837 }
 838
 839 static bool ttm_bo_mt_compatible(struct ttm_mem_type_manager *man,
 840                                  bool disallow_fixed,
 841                                  uint32_t mem_type,
 842                                  uint32_t proposed_placement,
 843                                  uint32_t *masked_placement)
 844 {
 845         uint32_t cur_flags = ttm_bo_type_flags(mem_type);
 846
 847         if ((man->flags & TTM_MEMTYPE_FLAG_FIXED) && disallow_fixed)
 848                 return false;
 849
 850         if ((cur_flags & proposed_placement & TTM_PL_MASK_MEM) == 0)
 851                 return false;
 852
 853         if ((proposed_placement & man->available_caching) == 0)
 854                 return false;
 855
 856         cur_flags |= (proposed_placement & man->available_caching);
 857
 858         *masked_placement = cur_flags;
 859         return true;
 860 }
 861
 862 /**
 863  * Creates space for memory region @mem according to its type.
 864  *
 865  * This function first searches for free space in compatible memory types in
 866  * the priority order defined by the driver.  If free space isn't found, then
 867  * ttm_bo_mem_force_space is attempted in priority order to evict and find
 868  * space.
 869  */
 870 int ttm_bo_mem_space(struct ttm_buffer_object *bo,
 871                         struct ttm_placement *placement,
 872                         struct ttm_mem_reg *mem,
 873                         bool interruptible, bool no_wait_reserve,
 874                         bool no_wait_gpu)
 875 {
 876         struct ttm_bo_device *bdev = bo->bdev;
 877         struct ttm_mem_type_manager *man;
 878         uint32_t mem_type = TTM_PL_SYSTEM;
 879         uint32_t cur_flags = 0;
 880         bool type_found = false;
 881         bool type_ok = false;
 882         bool has_erestartsys = false;
 883         struct drm_mm_node *node = NULL;
 884         int i, ret;
 885
 886         mem->mm_node = NULL;
 887         for (i = 0; i < placement->num_placement; ++i) {
 888                 ret = ttm_mem_type_from_flags(placement->placement[i],
 889                                                 &mem_type);
 890                 if (ret)
 891                         return ret;
 892                 man = &bdev->man[mem_type];
 893
 894                 type_ok = ttm_bo_mt_compatible(man,
 895                                                 bo->type == ttm_bo_type_user,
 896                                                 mem_type,
 897                                                 placement->placement[i],
 898                                                 &cur_flags);
 899
 900                 if (!type_ok)
 901                         continue;
 902
 903                 cur_flags = ttm_bo_select_caching(man, bo->mem.placement,
 904                                                   cur_flags);
 905                 /*
 906                  * Use the access and other non-mapping-related flag bits from
 907                  * the memory placement flags to the current flags
 908                  */
 909                 ttm_flag_masked(&cur_flags, placement->placement[i],
 910                                 ~TTM_PL_MASK_MEMTYPE);
 911
 912                 if (mem_type == TTM_PL_SYSTEM)
 913                         break;
 914
 915                 if (man->has_type && man->use_type) {
 916                         type_found = true;
 917                         ret = ttm_bo_man_get_node(bo, man, placement, mem,
 918                                                         &node);
 919                         if (unlikely(ret))
 920                                 return ret;
 921                 }
 922                 if (node)
 923                         break;
 924         }
 925
 926         if ((type_ok && (mem_type == TTM_PL_SYSTEM)) || node) {
 927                 mem->mm_node = node;
 928                 mem->mem_type = mem_type;
 929                 mem->placement = cur_flags;
 930                 return 0;
 931         }
 932
 933         if (!type_found)
 934                 return -EINVAL;
 935
 936         for (i = 0; i < placement->num_busy_placement; ++i) {
 937                 ret = ttm_mem_type_from_flags(placement->busy_placement[i],
 938                                                 &mem_type);
 939                 if (ret)
 940                         return ret;
 941                 man = &bdev->man[mem_type];
 942                 if (!man->has_type)
 943                         continue;
 944                 if (!ttm_bo_mt_compatible(man,
 945                                                 bo->type == ttm_bo_type_user,
 946                                                 mem_type,
 947                                                 placement->busy_placement[i],
 948                                                 &cur_flags))
 949                         continue;
 950
 951                 cur_flags = ttm_bo_select_caching(man, bo->mem.placement,
 952                                                   cur_flags);
 953                 /*
 954                  * Use the access and other non-mapping-related flag bits from
 955                  * the memory placement flags to the current flags
 956                  */
 957                 ttm_flag_masked(&cur_flags, placement->busy_placement[i],
 958                                 ~TTM_PL_MASK_MEMTYPE);
 959
 960
 961                 if (mem_type == TTM_PL_SYSTEM) {
 962                         mem->mem_type = mem_type;
 963                         mem->placement = cur_flags;
 964                         mem->mm_node = NULL;
 965                         return 0;
 966                 }
 967
 968                 ret = ttm_bo_mem_force_space(bo, mem_type, placement, mem,
 969                                                 interruptible, no_wait_reserve, no_wait_gpu);
 970                 if (ret == 0 && mem->mm_node) {
 971                         mem->placement = cur_flags;
 972                         return 0;
 973                 }
 974                 if (ret == -ERESTARTSYS)
 975                         has_erestartsys = true;
 976         }
 977         ret = (has_erestartsys) ? -ERESTARTSYS : -ENOMEM;
 978         return ret;
 979 }
 980 EXPORT_SYMBOL(ttm_bo_mem_space);
 981
 982 int ttm_bo_wait_cpu(struct ttm_buffer_object *bo, bool no_wait)
 983 {
 984         if ((atomic_read(&bo->cpu_writers) > 0) && no_wait)
 985                 return -EBUSY;
 986
 987         return wait_event_interruptible(bo->event_queue,
 988                                         atomic_read(&bo->cpu_writers) == 0);
 989 }
 990 EXPORT_SYMBOL(ttm_bo_wait_cpu);
 991
 992 int ttm_bo_move_buffer(struct ttm_buffer_object *bo,
 993                         struct ttm_placement *placement,
 994                         bool interruptible, bool no_wait_reserve,
 995                         bool no_wait_gpu)
 996 {
 997         struct ttm_bo_global *glob = bo->glob;
 998         int ret = 0;
 999         struct ttm_mem_reg mem;
1000
1001         BUG_ON(!atomic_read(&bo->reserved));
1002
1003         /*
1004          * FIXME: It's possible to pipeline buffer moves.
1005          * Have the driver move function wait for idle when necessary,
1006          * instead of doing it here.
1007          */
1008         spin_lock(&bo->lock);
1009         ret = ttm_bo_wait(bo, false, interruptible, no_wait_gpu);
1010         spin_unlock(&bo->lock);
1011         if (ret)
1012                 return ret;
1013         mem.num_pages = bo->num_pages;
1014         mem.size = mem.num_pages << PAGE_SHIFT;
1015         mem.page_alignment = bo->mem.page_alignment;
1016         mem.bus.io_reserved = false;
1017         /*
1018          * Determine where to move the buffer.
1019          */
1020         ret = ttm_bo_mem_space(bo, placement, &mem, interruptible, no_wait_reserve, no_wait_gpu);
1021         if (ret)
1022                 goto out_unlock;
1023         ret = ttm_bo_handle_move_mem(bo, &mem, false, interruptible, no_wait_reserve, no_wait_gpu);
1024 out_unlock:
1025         if (ret && mem.mm_node) {
1026                 spin_lock(&glob->lru_lock);
1027                 drm_mm_put_block(mem.mm_node);
1028                 spin_unlock(&glob->lru_lock);
1029         }
1030         return ret;
1031 }
1032
1033 static int ttm_bo_mem_compat(struct ttm_placement *placement,
1034                              struct ttm_mem_reg *mem)
1035 {
1036         int i;
1037         struct drm_mm_node *node = mem->mm_node;
1038
1039         if (node && placement->lpfn != 0 &&
1040             (node->start < placement->fpfn ||
1041              node->start + node->size > placement->lpfn))
1042                 return -1;
1043
1044         for (i = 0; i < placement->num_placement; i++) {
1045                 if ((placement->placement[i] & mem->placement &
1046                         TTM_PL_MASK_CACHING) &&
1047                         (placement->placement[i] & mem->placement &
1048                         TTM_PL_MASK_MEM))
1049                         return i;
1050         }
1051         return -1;
1052 }
1053
1054 int ttm_bo_validate(struct ttm_buffer_object *bo,
1055                         struct ttm_placement *placement,
1056                         bool interruptible, bool no_wait_reserve,
1057                         bool no_wait_gpu)
1058 {
1059         int ret;
1060
1061         BUG_ON(!atomic_read(&bo->reserved));
1062         /* Check that range is valid */
1063         if (placement->lpfn || placement->fpfn)
1064                 if (placement->fpfn > placement->lpfn ||
1065                         (placement->lpfn - placement->fpfn) < bo->num_pages)
1066                         return -EINVAL;
1067         /*
1068          * Check whether we need to move buffer.
1069          */
1070         ret = ttm_bo_mem_compat(placement, &bo->mem);
1071         if (ret < 0) {
1072                 ret = ttm_bo_move_buffer(bo, placement, interruptible, no_wait_reserve, no_wait_gpu);
1073                 if (ret)
1074                         return ret;
1075         } else {
1076                 /*
1077                  * Use the access and other non-mapping-related flag bits from
1078                  * the compatible memory placement flags to the active flags
1079                  */
1080                 ttm_flag_masked(&bo->mem.placement, placement->placement[ret],
1081                                 ~TTM_PL_MASK_MEMTYPE);
1082         }
1083         /*
1084          * We might need to add a TTM.
1085          */
1086         if (bo->mem.mem_type == TTM_PL_SYSTEM && bo->ttm == NULL) {
1087                 ret = ttm_bo_add_ttm(bo, true);
1088                 if (ret)
1089                         return ret;
1090         }
1091         return 0;
1092 }
1093 EXPORT_SYMBOL(ttm_bo_validate);
1094
1095 int ttm_bo_check_placement(struct ttm_buffer_object *bo,
1096                                 struct ttm_placement *placement)
1097 {
1098         int i;
1099
1100         if (placement->fpfn || placement->lpfn) {
1101                 if (bo->mem.num_pages > (placement->lpfn - placement->fpfn)) {
1102                         printk(KERN_ERR TTM_PFX "Page number range to small "
1103                                 "Need %lu pages, range is [%u, %u]\n",
1104                                 bo->mem.num_pages, placement->fpfn,
1105                                 placement->lpfn);
1106                         return -EINVAL;
1107                 }
1108         }
1109         for (i = 0; i < placement->num_placement; i++) {
1110                 if (!capable(CAP_SYS_ADMIN)) {
1111                         if (placement->placement[i] & TTM_PL_FLAG_NO_EVICT) {
1112                                 printk(KERN_ERR TTM_PFX "Need to be root to "
1113                                         "modify NO_EVICT status.\n");
1114                                 return -EINVAL;
1115                         }
1116                 }
1117         }
1118         for (i = 0; i < placement->num_busy_placement; i++) {
1119                 if (!capable(CAP_SYS_ADMIN)) {
1120                         if (placement->busy_placement[i] & TTM_PL_FLAG_NO_EVICT) {
1121                                 printk(KERN_ERR TTM_PFX "Need to be root to "
1122                                         "modify NO_EVICT status.\n");
1123                                 return -EINVAL;
1124                         }
1125                 }
1126         }
1127         return 0;
1128 }
1129
1130 int ttm_bo_init(struct ttm_bo_device *bdev,
1131                 struct ttm_buffer_object *bo,
1132                 unsigned long size,
1133                 enum ttm_bo_type type,
1134                 struct ttm_placement *placement,
1135                 uint32_t page_alignment,
1136                 unsigned long buffer_start,
1137                 bool interruptible,
1138                 struct file *persistant_swap_storage,
1139                 size_t acc_size,
1140                 void (*destroy) (struct ttm_buffer_object *))
1141 {
1142         int ret = 0;
1143         unsigned long num_pages;
1144
1145         size += buffer_start & ~PAGE_MASK;
1146         num_pages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
1147         if (num_pages == 0) {
1148                 printk(KERN_ERR TTM_PFX "Illegal buffer object size.\n");
1149                 return -EINVAL;
1150         }
1151         bo->destroy = destroy;
1152
1153         spin_lock_init(&bo->lock);
1154         kref_init(&bo->kref);
1155         kref_init(&bo->list_kref);
1156         atomic_set(&bo->cpu_writers, 0);
1157         atomic_set(&bo->reserved, 1);
1158         init_waitqueue_head(&bo->event_queue);
1159         INIT_LIST_HEAD(&bo->lru);
1160         INIT_LIST_HEAD(&bo->ddestroy);
1161         INIT_LIST_HEAD(&bo->swap);
1162         bo->bdev = bdev;
1163         bo->glob = bdev->glob;
1164         bo->type = type;
1165         bo->num_pages = num_pages;
1166         bo->mem.size = num_pages << PAGE_SHIFT;
1167         bo->mem.mem_type = TTM_PL_SYSTEM;
1168         bo->mem.num_pages = bo->num_pages;
1169         bo->mem.mm_node = NULL;
1170         bo->mem.page_alignment = page_alignment;
1171         bo->mem.bus.io_reserved = false;
1172         bo->buffer_start = buffer_start & PAGE_MASK;
1173         bo->priv_flags = 0;
1174         bo->mem.placement = (TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED);
1175         bo->seq_valid = false;
1176         bo->persistant_swap_storage = persistant_swap_storage;
1177         bo->acc_size = acc_size;
1178         atomic_inc(&bo->glob->bo_count);
1179
1180         ret = ttm_bo_check_placement(bo, placement);
1181         if (unlikely(ret != 0))
1182                 goto out_err;
1183
1184         /*
1185          * For ttm_bo_type_device buffers, allocate
1186          * address space from the device.
1187          */
1188         if (bo->type == ttm_bo_type_device) {
1189                 ret = ttm_bo_setup_vm(bo);
1190                 if (ret)
1191                         goto out_err;
1192         }
1193
1194         ret = ttm_bo_validate(bo, placement, interruptible, false, false);
1195         if (ret)
1196                 goto out_err;
1197
1198         ttm_bo_unreserve(bo);
1199         return 0;
1200
1201 out_err:
1202         ttm_bo_unreserve(bo);
1203         ttm_bo_unref(&bo);
1204
1205         return ret;
1206 }
1207 EXPORT_SYMBOL(ttm_bo_init);
1208
1209 static inline size_t ttm_bo_size(struct ttm_bo_global *glob,
1210                                  unsigned long num_pages)
1211 {
1212         size_t page_array_size = (num_pages * sizeof(void *) + PAGE_SIZE - 1) &
1213             PAGE_MASK;
1214
1215         return glob->ttm_bo_size + 2 * page_array_size;
1216 }
1217
1218 int ttm_bo_create(struct ttm_bo_device *bdev,
1219                         unsigned long size,
1220                         enum ttm_bo_type type,
1221                         struct ttm_placement *placement,
1222                         uint32_t page_alignment,
1223                         unsigned long buffer_start,
1224                         bool interruptible,
1225                         struct file *persistant_swap_storage,
1226                         struct ttm_buffer_object **p_bo)
1227 {
1228         struct ttm_buffer_object *bo;
1229         struct ttm_mem_global *mem_glob = bdev->glob->mem_glob;
1230         int ret;
1231
1232         size_t acc_size =
1233             ttm_bo_size(bdev->glob, (size + PAGE_SIZE - 1) >> PAGE_SHIFT);
1234         ret = ttm_mem_global_alloc(mem_glob, acc_size, false, false);
1235         if (unlikely(ret != 0))
1236                 return ret;
1237
1238         bo = kzalloc(sizeof(*bo), GFP_KERNEL);
1239
1240         if (unlikely(bo == NULL)) {
1241                 ttm_mem_global_free(mem_glob, acc_size);
1242                 return -ENOMEM;
1243         }
1244
1245         ret = ttm_bo_init(bdev, bo, size, type, placement, page_alignment,
1246                                 buffer_start, interruptible,
1247                                 persistant_swap_storage, acc_size, NULL);
1248         if (likely(ret == 0))
1249                 *p_bo = bo;
1250
1251         return ret;
1252 }
1253
1254 static int ttm_bo_force_list_clean(struct ttm_bo_device *bdev,
1255                                         unsigned mem_type, bool allow_errors)
1256 {
1257         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
1258         struct ttm_bo_global *glob = bdev->glob;
1259         int ret;
1260
1261         /*
1262          * Can't use standard list traversal since we're unlocking.
1263          */
1264
1265         spin_lock(&glob->lru_lock);
1266         while (!list_empty(&man->lru)) {
1267                 spin_unlock(&glob->lru_lock);
1268                 ret = ttm_mem_evict_first(bdev, mem_type, false, false, false);
1269                 if (ret) {
1270                         if (allow_errors) {
1271                                 return ret;
1272                         } else {
1273                                 printk(KERN_ERR TTM_PFX
1274                                         "Cleanup eviction failed\n");
1275                         }
1276                 }
1277                 spin_lock(&glob->lru_lock);
1278         }
1279         spin_unlock(&glob->lru_lock);
1280         return 0;
1281 }
1282
1283 int ttm_bo_clean_mm(struct ttm_bo_device *bdev, unsigned mem_type)
1284 {
1285         struct ttm_bo_global *glob = bdev->glob;
1286         struct ttm_mem_type_manager *man;
1287         int ret = -EINVAL;
1288
1289         if (mem_type >= TTM_NUM_MEM_TYPES) {
1290                 printk(KERN_ERR TTM_PFX "Illegal memory type %d\n", mem_type);
1291                 return ret;
1292         }
1293         man = &bdev->man[mem_type];
1294
1295         if (!man->has_type) {
1296                 printk(KERN_ERR TTM_PFX "Trying to take down uninitialized "
1297                        "memory manager type %u\n", mem_type);
1298                 return ret;
1299         }
1300
1301         man->use_type = false;
1302         man->has_type = false;
1303
1304         ret = 0;
1305         if (mem_type > 0) {
1306                 ttm_bo_force_list_clean(bdev, mem_type, false);
1307
1308                 spin_lock(&glob->lru_lock);
1309                 if (drm_mm_clean(&man->manager))
1310                         drm_mm_takedown(&man->manager);
1311                 else
1312                         ret = -EBUSY;
1313
1314                 spin_unlock(&glob->lru_lock);
1315         }
1316
1317         return ret;
1318 }
1319 EXPORT_SYMBOL(ttm_bo_clean_mm);
1320
1321 int ttm_bo_evict_mm(struct ttm_bo_device *bdev, unsigned mem_type)
1322 {
1323         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
1324
1325         if (mem_type == 0 || mem_type >= TTM_NUM_MEM_TYPES) {
1326                 printk(KERN_ERR TTM_PFX
1327                        "Illegal memory manager memory type %u.\n",
1328                        mem_type);
1329                 return -EINVAL;
1330         }
1331
1332         if (!man->has_type) {
1333                 printk(KERN_ERR TTM_PFX
1334                        "Memory type %u has not been initialized.\n",
1335                        mem_type);
1336                 return 0;
1337         }
1338
1339         return ttm_bo_force_list_clean(bdev, mem_type, true);
1340 }
1341 EXPORT_SYMBOL(ttm_bo_evict_mm);
1342
1343 int ttm_bo_init_mm(struct ttm_bo_device *bdev, unsigned type,
1344                         unsigned long p_size)
1345 {
1346         int ret = -EINVAL;
1347         struct ttm_mem_type_manager *man;
1348
1349         if (type >= TTM_NUM_MEM_TYPES) {
1350                 printk(KERN_ERR TTM_PFX "Illegal memory type %d\n", type);
1351                 return ret;
1352         }
1353
1354         man = &bdev->man[type];
1355         if (man->has_type) {
1356                 printk(KERN_ERR TTM_PFX
1357                        "Memory manager already initialized for type %d\n",
1358                        type);
1359                 return ret;
1360         }
1361
1362         ret = bdev->driver->init_mem_type(bdev, type, man);
1363         if (ret)
1364                 return ret;
1365
1366         ret = 0;
1367         if (type != TTM_PL_SYSTEM) {
1368                 if (!p_size) {
1369                         printk(KERN_ERR TTM_PFX
1370                                "Zero size memory manager type %d\n",
1371                                type);
1372                         return ret;
1373                 }
1374                 ret = drm_mm_init(&man->manager, 0, p_size);
1375                 if (ret)
1376                         return ret;
1377         }
1378         man->has_type = true;
1379         man->use_type = true;
1380         man->size = p_size;
1381
1382         INIT_LIST_HEAD(&man->lru);
1383
1384         return 0;
1385 }
1386 EXPORT_SYMBOL(ttm_bo_init_mm);
1387
1388 static void ttm_bo_global_kobj_release(struct kobject *kobj)
1389 {
1390         struct ttm_bo_global *glob =
1391                 container_of(kobj, struct ttm_bo_global, kobj);
1392
1393         ttm_mem_unregister_shrink(glob->mem_glob, &glob->shrink);
1394         __free_page(glob->dummy_read_page);
1395         kfree(glob);
1396 }
1397
1398 void ttm_bo_global_release(struct drm_global_reference *ref)
1399 {
1400         struct ttm_bo_global *glob = ref->object;
1401
1402         kobject_del(&glob->kobj);
1403         kobject_put(&glob->kobj);
1404 }
1405 EXPORT_SYMBOL(ttm_bo_global_release);
1406
1407 int ttm_bo_global_init(struct drm_global_reference *ref)
1408 {
1409         struct ttm_bo_global_ref *bo_ref =
1410                 container_of(ref, struct ttm_bo_global_ref, ref);
1411         struct ttm_bo_global *glob = ref->object;
1412         int ret;
1413
1414         mutex_init(&glob->device_list_mutex);
1415         spin_lock_init(&glob->lru_lock);
1416         glob->mem_glob = bo_ref->mem_glob;
1417         glob->dummy_read_page = alloc_page(__GFP_ZERO | GFP_DMA32);
1418
1419         if (unlikely(glob->dummy_read_page == NULL)) {
1420                 ret = -ENOMEM;
1421                 goto out_no_drp;
1422         }
1423
1424         INIT_LIST_HEAD(&glob->swap_lru);
1425         INIT_LIST_HEAD(&glob->device_list);
1426
1427         ttm_mem_init_shrink(&glob->shrink, ttm_bo_swapout);
1428         ret = ttm_mem_register_shrink(glob->mem_glob, &glob->shrink);
1429         if (unlikely(ret != 0)) {
1430                 printk(KERN_ERR TTM_PFX
1431                        "Could not register buffer object swapout.\n");
1432                 goto out_no_shrink;
1433         }
1434
1435         glob->ttm_bo_extra_size =
1436                 ttm_round_pot(sizeof(struct ttm_tt)) +
1437                 ttm_round_pot(sizeof(struct ttm_backend));
1438
1439         glob->ttm_bo_size = glob->ttm_bo_extra_size +
1440                 ttm_round_pot(sizeof(struct ttm_buffer_object));
1441
1442         atomic_set(&glob->bo_count, 0);
1443
1444         ret = kobject_init_and_add(
1445                 &glob->kobj, &ttm_bo_glob_kobj_type, ttm_get_kobj(), "buffer_objects");
1446         if (unlikely(ret != 0))
1447                 kobject_put(&glob->kobj);
1448         return ret;
1449 out_no_shrink:
1450         __free_page(glob->dummy_read_page);
1451 out_no_drp:
1452         kfree(glob);
1453         return ret;
1454 }
1455 EXPORT_SYMBOL(ttm_bo_global_init);
1456
1457
1458 int ttm_bo_device_release(struct ttm_bo_device *bdev)
1459 {
1460         int ret = 0;
1461         unsigned i = TTM_NUM_MEM_TYPES;
1462         struct ttm_mem_type_manager *man;
1463         struct ttm_bo_global *glob = bdev->glob;
1464
1465         while (i--) {
1466                 man = &bdev->man[i];
1467                 if (man->has_type) {
1468                         man->use_type = false;
1469                         if ((i != TTM_PL_SYSTEM) && ttm_bo_clean_mm(bdev, i)) {
1470                                 ret = -EBUSY;
1471                                 printk(KERN_ERR TTM_PFX
1472                                        "DRM memory manager type %d "
1473                                        "is not clean.\n", i);
1474                         }
1475                         man->has_type = false;
1476                 }
1477         }
1478
1479         mutex_lock(&glob->device_list_mutex);
1480         list_del(&bdev->device_list);
1481         mutex_unlock(&glob->device_list_mutex);
1482
1483         if (!cancel_delayed_work(&bdev->wq))
1484                 flush_scheduled_work();
1485
1486         while (ttm_bo_delayed_delete(bdev, true))
1487                 ;
1488
1489         spin_lock(&glob->lru_lock);
1490         if (list_empty(&bdev->ddestroy))
1491                 TTM_DEBUG("Delayed destroy list was clean\n");
1492
1493         if (list_empty(&bdev->man[0].lru))
1494                 TTM_DEBUG("Swap list was clean\n");
1495         spin_unlock(&glob->lru_lock);
1496
1497         BUG_ON(!drm_mm_clean(&bdev->addr_space_mm));
1498         write_lock(&bdev->vm_lock);
1499         drm_mm_takedown(&bdev->addr_space_mm);
1500         write_unlock(&bdev->vm_lock);
1501
1502         return ret;
1503 }
1504 EXPORT_SYMBOL(ttm_bo_device_release);
1505
1506 int ttm_bo_device_init(struct ttm_bo_device *bdev,
1507                        struct ttm_bo_global *glob,
1508                        struct ttm_bo_driver *driver,
1509                        uint64_t file_page_offset,
1510                        bool need_dma32)
1511 {
1512         int ret = -EINVAL;
1513
1514         rwlock_init(&bdev->vm_lock);
1515         bdev->driver = driver;
1516
1517         memset(bdev->man, 0, sizeof(bdev->man));
1518
1519         /*
1520          * Initialize the system memory buffer type.
1521          * Other types need to be driver / IOCTL initialized.
1522          */
1523         ret = ttm_bo_init_mm(bdev, TTM_PL_SYSTEM, 0);
1524         if (unlikely(ret != 0))
1525                 goto out_no_sys;
1526
1527         bdev->addr_space_rb = RB_ROOT;
1528         ret = drm_mm_init(&bdev->addr_space_mm, file_page_offset, 0x10000000);
1529         if (unlikely(ret != 0))
1530                 goto out_no_addr_mm;
1531
1532         INIT_DELAYED_WORK(&bdev->wq, ttm_bo_delayed_workqueue);
1533         bdev->nice_mode = true;
1534         INIT_LIST_HEAD(&bdev->ddestroy);
1535         bdev->dev_mapping = NULL;
1536         bdev->glob = glob;
1537         bdev->need_dma32 = need_dma32;
1538
1539         mutex_lock(&glob->device_list_mutex);
1540         list_add_tail(&bdev->device_list, &glob->device_list);
1541         mutex_unlock(&glob->device_list_mutex);
1542
1543         return 0;
1544 out_no_addr_mm:
1545         ttm_bo_clean_mm(bdev, 0);
1546 out_no_sys:
1547         return ret;
1548 }
1549 EXPORT_SYMBOL(ttm_bo_device_init);
1550
1551 /*
1552  * buffer object vm functions.
1553  */
1554
1555 bool ttm_mem_reg_is_pci(struct ttm_bo_device *bdev, struct ttm_mem_reg *mem)
1556 {
1557         struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
1558
1559         if (!(man->flags & TTM_MEMTYPE_FLAG_FIXED)) {
1560                 if (mem->mem_type == TTM_PL_SYSTEM)
1561                         return false;
1562
1563                 if (man->flags & TTM_MEMTYPE_FLAG_CMA)
1564                         return false;
1565
1566                 if (mem->placement & TTM_PL_FLAG_CACHED)
1567                         return false;
1568         }
1569         return true;
1570 }
1571
1572 void ttm_bo_unmap_virtual(struct ttm_buffer_object *bo)
1573 {
1574         struct ttm_bo_device *bdev = bo->bdev;
1575         loff_t offset = (loff_t) bo->addr_space_offset;
1576         loff_t holelen = ((loff_t) bo->mem.num_pages) << PAGE_SHIFT;
1577
1578         if (!bdev->dev_mapping)
1579                 return;
1580         unmap_mapping_range(bdev->dev_mapping, offset, holelen, 1);
1581         ttm_mem_io_free(bdev, &bo->mem);
1582 }
1583 EXPORT_SYMBOL(ttm_bo_unmap_virtual);
1584
1585 static void ttm_bo_vm_insert_rb(struct ttm_buffer_object *bo)
1586 {
1587         struct ttm_bo_device *bdev = bo->bdev;
1588         struct rb_node **cur = &bdev->addr_space_rb.rb_node;
1589         struct rb_node *parent = NULL;
1590         struct ttm_buffer_object *cur_bo;
1591         unsigned long offset = bo->vm_node->start;
1592         unsigned long cur_offset;
1593
1594         while (*cur) {
1595                 parent = *cur;
1596                 cur_bo = rb_entry(parent, struct ttm_buffer_object, vm_rb);
1597                 cur_offset = cur_bo->vm_node->start;
1598                 if (offset < cur_offset)
1599                         cur = &parent->rb_left;
1600                 else if (offset > cur_offset)
1601                         cur = &parent->rb_right;
1602                 else
1603                         BUG();
1604         }
1605
1606         rb_link_node(&bo->vm_rb, parent, cur);
1607         rb_insert_color(&bo->vm_rb, &bdev->addr_space_rb);
1608 }
1609
1610 /**
1611  * ttm_bo_setup_vm:
1612  *
1613  * @bo: the buffer to allocate address space for
1614  *
1615  * Allocate address space in the drm device so that applications
1616  * can mmap the buffer and access the contents. This only
1617  * applies to ttm_bo_type_device objects as others are not
1618  * placed in the drm device address space.
1619  */
1620
1621 static int ttm_bo_setup_vm(struct ttm_buffer_object *bo)
1622 {
1623         struct ttm_bo_device *bdev = bo->bdev;
1624         int ret;
1625
1626 retry_pre_get:
1627         ret = drm_mm_pre_get(&bdev->addr_space_mm);
1628         if (unlikely(ret != 0))
1629                 return ret;
1630
1631         write_lock(&bdev->vm_lock);
1632         bo->vm_node = drm_mm_search_free(&bdev->addr_space_mm,
1633                                          bo->mem.num_pages, 0, 0);
1634
1635         if (unlikely(bo->vm_node == NULL)) {
1636                 ret = -ENOMEM;
1637                 goto out_unlock;
1638         }
1639
1640         bo->vm_node = drm_mm_get_block_atomic(bo->vm_node,
1641                                               bo->mem.num_pages, 0);
1642
1643         if (unlikely(bo->vm_node == NULL)) {
1644                 write_unlock(&bdev->vm_lock);
1645                 goto retry_pre_get;
1646         }
1647
1648         ttm_bo_vm_insert_rb(bo);
1649         write_unlock(&bdev->vm_lock);
1650         bo->addr_space_offset = ((uint64_t) bo->vm_node->start) << PAGE_SHIFT;
1651
1652         return 0;
1653 out_unlock:
1654         write_unlock(&bdev->vm_lock);
1655         return ret;
1656 }
1657
1658 int ttm_bo_wait(struct ttm_buffer_object *bo,
1659                 bool lazy, bool interruptible, bool no_wait)
1660 {
1661         struct ttm_bo_driver *driver = bo->bdev->driver;
1662         void *sync_obj;
1663         void *sync_obj_arg;
1664         int ret = 0;
1665
1666         if (likely(bo->sync_obj == NULL))
1667                 return 0;
1668
1669         while (bo->sync_obj) {
1670
1671                 if (driver->sync_obj_signaled(bo->sync_obj, bo->sync_obj_arg)) {
1672                         void *tmp_obj = bo->sync_obj;
1673                         bo->sync_obj = NULL;
1674                         clear_bit(TTM_BO_PRIV_FLAG_MOVING, &bo->priv_flags);
1675                         spin_unlock(&bo->lock);
1676                         driver->sync_obj_unref(&tmp_obj);
1677                         spin_lock(&bo->lock);
1678                         continue;
1679                 }
1680
1681                 if (no_wait)
1682                         return -EBUSY;
1683
1684                 sync_obj = driver->sync_obj_ref(bo->sync_obj);
1685                 sync_obj_arg = bo->sync_obj_arg;
1686                 spin_unlock(&bo->lock);
1687                 ret = driver->sync_obj_wait(sync_obj, sync_obj_arg,
1688                                             lazy, interruptible);
1689                 if (unlikely(ret != 0)) {
1690                         driver->sync_obj_unref(&sync_obj);
1691                         spin_lock(&bo->lock);
1692                         return ret;
1693                 }
1694                 spin_lock(&bo->lock);
1695                 if (likely(bo->sync_obj == sync_obj &&
1696                            bo->sync_obj_arg == sync_obj_arg)) {
1697                         void *tmp_obj = bo->sync_obj;
1698                         bo->sync_obj = NULL;
1699                         clear_bit(TTM_BO_PRIV_FLAG_MOVING,
1700                                   &bo->priv_flags);
1701                         spin_unlock(&bo->lock);
1702                         driver->sync_obj_unref(&sync_obj);
1703                         driver->sync_obj_unref(&tmp_obj);
1704                         spin_lock(&bo->lock);
1705                 } else {
1706                         spin_unlock(&bo->lock);
1707                         driver->sync_obj_unref(&sync_obj);
1708                         spin_lock(&bo->lock);
1709                 }
1710         }
1711         return 0;
1712 }
1713 EXPORT_SYMBOL(ttm_bo_wait);
1714
1715 int ttm_bo_synccpu_write_grab(struct ttm_buffer_object *bo, bool no_wait)
1716 {
1717         int ret = 0;
1718
1719         /*
1720          * Using ttm_bo_reserve makes sure the lru lists are updated.
1721          */
1722
1723         ret = ttm_bo_reserve(bo, true, no_wait, false, 0);
1724         if (unlikely(ret != 0))
1725                 return ret;
1726         spin_lock(&bo->lock);
1727         ret = ttm_bo_wait(bo, false, true, no_wait);
1728         spin_unlock(&bo->lock);
1729         if (likely(ret == 0))
1730                 atomic_inc(&bo->cpu_writers);
1731         ttm_bo_unreserve(bo);
1732         return ret;
1733 }
1734 EXPORT_SYMBOL(ttm_bo_synccpu_write_grab);
1735
1736 void ttm_bo_synccpu_write_release(struct ttm_buffer_object *bo)
1737 {
1738         if (atomic_dec_and_test(&bo->cpu_writers))
1739                 wake_up_all(&bo->event_queue);
1740 }
1741 EXPORT_SYMBOL(ttm_bo_synccpu_write_release);
1742
1743 /**
1744  * A buffer object shrink method that tries to swap out the first
1745  * buffer object on the bo_global::swap_lru list.
1746  */
1747
1748 static int ttm_bo_swapout(struct ttm_mem_shrink *shrink)
1749 {
1750         struct ttm_bo_global *glob =
1751             container_of(shrink, struct ttm_bo_global, shrink);
1752         struct ttm_buffer_object *bo;
1753         int ret = -EBUSY;
1754         int put_count;
1755         uint32_t swap_placement = (TTM_PL_FLAG_CACHED | TTM_PL_FLAG_SYSTEM);
1756
1757         spin_lock(&glob->lru_lock);
1758         while (ret == -EBUSY) {
1759                 if (unlikely(list_empty(&glob->swap_lru))) {
1760                         spin_unlock(&glob->lru_lock);
1761                         return -EBUSY;
1762                 }
1763
1764                 bo = list_first_entry(&glob->swap_lru,
1765                                       struct ttm_buffer_object, swap);
1766                 kref_get(&bo->list_kref);
1767
1768                 /**
1769                  * Reserve buffer. Since we unlock while sleeping, we need
1770                  * to re-check that nobody removed us from the swap-list while
1771                  * we slept.
1772                  */
1773
1774                 ret = ttm_bo_reserve_locked(bo, false, true, false, 0);
1775                 if (unlikely(ret == -EBUSY)) {
1776                         spin_unlock(&glob->lru_lock);
1777                         ttm_bo_wait_unreserved(bo, false);
1778                         kref_put(&bo->list_kref, ttm_bo_release_list);
1779                         spin_lock(&glob->lru_lock);
1780                 }
1781         }
1782
1783         BUG_ON(ret != 0);
1784         put_count = ttm_bo_del_from_lru(bo);
1785         spin_unlock(&glob->lru_lock);
1786
1787         while (put_count--)
1788                 kref_put(&bo->list_kref, ttm_bo_ref_bug);
1789
1790         /**
1791          * Wait for GPU, then move to system cached.
1792          */
1793
1794         spin_lock(&bo->lock);
1795         ret = ttm_bo_wait(bo, false, false, false);
1796         spin_unlock(&bo->lock);
1797
1798         if (unlikely(ret != 0))
1799                 goto out;
1800
1801         if ((bo->mem.placement & swap_placement) != swap_placement) {
1802                 struct ttm_mem_reg evict_mem;
1803
1804                 evict_mem = bo->mem;
1805                 evict_mem.mm_node = NULL;
1806                 evict_mem.placement = TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED;
1807                 evict_mem.mem_type = TTM_PL_SYSTEM;
1808
1809                 ret = ttm_bo_handle_move_mem(bo, &evict_mem, true,
1810                                              false, false, false);
1811                 if (unlikely(ret != 0))
1812                         goto out;
1813         }
1814
1815         ttm_bo_unmap_virtual(bo);
1816
1817         /**
1818          * Swap out. Buffer will be swapped in again as soon as
1819          * anyone tries to access a ttm page.
1820          */
1821
1822         if (bo->bdev->driver->swap_notify)
1823                 bo->bdev->driver->swap_notify(bo);
1824
1825         ret = ttm_tt_swapout(bo->ttm, bo->persistant_swap_storage);
1826 out:
1827
1828         /**
1829          *
1830          * Unreserve without putting on LRU to avoid swapping out an
1831          * already swapped buffer.
1832          */
1833
1834         atomic_set(&bo->reserved, 0);
1835         wake_up_all(&bo->event_queue);
1836         kref_put(&bo->list_kref, ttm_bo_release_list);
1837         return ret;
1838 }
1839
1840 void ttm_bo_swapout_all(struct ttm_bo_device *bdev)
1841 {
1842         while (ttm_bo_swapout(&bdev->glob->shrink) == 0)
1843                 ;
1844 }
1845 EXPORT_SYMBOL(ttm_bo_swapout_all);