drivers/gpu/drm/ttm/ttm_bo.c

   1 /**************************************************************************
   2  *
   3  * Copyright (c) 2006-2009 VMware, Inc., Palo Alto, CA., USA
   4  * All Rights Reserved.
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * copy of this software and associated documentation files (the
   8  * "Software"), to deal in the Software without restriction, including
   9  * without limitation the rights to use, copy, modify, merge, publish,
  10  * distribute, sub license, and/or sell copies of the Software, and to
  11  * permit persons to whom the Software is furnished to do so, subject to
  12  * the following conditions:
  13  *
  14  * The above copyright notice and this permission notice (including the
  15  * next paragraph) shall be included in all copies or substantial portions
  16  * of the Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  19  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  20  * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
  21  * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
  22  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
  23  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
  24  * USE OR OTHER DEALINGS IN THE SOFTWARE.
  25  *
  26  **************************************************************************/
  27 /*
  28  * Authors: Thomas Hellstrom <thellstrom-at-vmware-dot-com>
  29  */
  30
  31 #include "ttm/ttm_module.h"
  32 #include "ttm/ttm_bo_driver.h"
  33 #include "ttm/ttm_placement.h"
  34 #include <linux/jiffies.h>
  35 #include <linux/slab.h>
  36 #include <linux/sched.h>
  37 #include <linux/mm.h>
  38 #include <linux/file.h>
  39 #include <linux/module.h>
  40 #include <asm/atomic.h>
  41
  42 #define TTM_ASSERT_LOCKED(param)
  43 #define TTM_DEBUG(fmt, arg...)
  44 #define TTM_BO_HASH_ORDER 13
  45
  46 static int ttm_bo_setup_vm(struct ttm_buffer_object *bo);
  47 static int ttm_bo_swapout(struct ttm_mem_shrink *shrink);
  48 static void ttm_bo_global_kobj_release(struct kobject *kobj);
  49
  50 static struct attribute ttm_bo_count = {
  51         .name = "bo_count",
  52         .mode = S_IRUGO
  53 };
  54
  55 static inline int ttm_mem_type_from_flags(uint32_t flags, uint32_t *mem_type)
  56 {
  57         int i;
  58
  59         for (i = 0; i <= TTM_PL_PRIV5; i++)
  60                 if (flags & (1 << i)) {
  61                         *mem_type = i;
  62                         return 0;
  63                 }
  64         return -EINVAL;
  65 }
  66
  67 static void ttm_mem_type_debug(struct ttm_bo_device *bdev, int mem_type)
  68 {
  69         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
  70
  71         printk(KERN_ERR TTM_PFX "    has_type: %d\n", man->has_type);
  72         printk(KERN_ERR TTM_PFX "    use_type: %d\n", man->use_type);
  73         printk(KERN_ERR TTM_PFX "    flags: 0x%08X\n", man->flags);
  74         printk(KERN_ERR TTM_PFX "    gpu_offset: 0x%08lX\n", man->gpu_offset);
  75         printk(KERN_ERR TTM_PFX "    size: %llu\n", man->size);
  76         printk(KERN_ERR TTM_PFX "    available_caching: 0x%08X\n",
  77                 man->available_caching);
  78         printk(KERN_ERR TTM_PFX "    default_caching: 0x%08X\n",
  79                 man->default_caching);
  80         if (mem_type != TTM_PL_SYSTEM)
  81                 (*man->func->debug)(man, TTM_PFX);
  82 }
  83
  84 static void ttm_bo_mem_space_debug(struct ttm_buffer_object *bo,
  85                                         struct ttm_placement *placement)
  86 {
  87         int i, ret, mem_type;
  88
  89         printk(KERN_ERR TTM_PFX "No space for %p (%lu pages, %luK, %luM)\n",
  90                 bo, bo->mem.num_pages, bo->mem.size >> 10,
  91                 bo->mem.size >> 20);
  92         for (i = 0; i < placement->num_placement; i++) {
  93                 ret = ttm_mem_type_from_flags(placement->placement[i],
  94                                                 &mem_type);
  95                 if (ret)
  96                         return;
  97                 printk(KERN_ERR TTM_PFX "  placement[%d]=0x%08X (%d)\n",
  98                         i, placement->placement[i], mem_type);
  99                 ttm_mem_type_debug(bo->bdev, mem_type);
 100         }
 101 }
 102
 103 static ssize_t ttm_bo_global_show(struct kobject *kobj,
 104                                   struct attribute *attr,
 105                                   char *buffer)
 106 {
 107         struct ttm_bo_global *glob =
 108                 container_of(kobj, struct ttm_bo_global, kobj);
 109
 110         return snprintf(buffer, PAGE_SIZE, "%lu\n",
 111                         (unsigned long) atomic_read(&glob->bo_count));
 112 }
 113
 114 static struct attribute *ttm_bo_global_attrs[] = {
 115         &ttm_bo_count,
 116         NULL
 117 };
 118
 119 static const struct sysfs_ops ttm_bo_global_ops = {
 120         .show = &ttm_bo_global_show
 121 };
 122
 123 static struct kobj_type ttm_bo_glob_kobj_type  = {
 124         .release = &ttm_bo_global_kobj_release,
 125         .sysfs_ops = &ttm_bo_global_ops,
 126         .default_attrs = ttm_bo_global_attrs
 127 };
 128
 129
 130 static inline uint32_t ttm_bo_type_flags(unsigned type)
 131 {
 132         return 1 << (type);
 133 }
 134
 135 static void ttm_bo_release_list(struct kref *list_kref)
 136 {
 137         struct ttm_buffer_object *bo =
 138             container_of(list_kref, struct ttm_buffer_object, list_kref);
 139         struct ttm_bo_device *bdev = bo->bdev;
 140
 141         BUG_ON(atomic_read(&bo->list_kref.refcount));
 142         BUG_ON(atomic_read(&bo->kref.refcount));
 143         BUG_ON(atomic_read(&bo->cpu_writers));
 144         BUG_ON(bo->sync_obj != NULL);
 145         BUG_ON(bo->mem.mm_node != NULL);
 146         BUG_ON(!list_empty(&bo->lru));
 147         BUG_ON(!list_empty(&bo->ddestroy));
 148
 149         if (bo->ttm)
 150                 ttm_tt_destroy(bo->ttm);
 151         atomic_dec(&bo->glob->bo_count);
 152         if (bo->destroy)
 153                 bo->destroy(bo);
 154         else {
 155                 ttm_mem_global_free(bdev->glob->mem_glob, bo->acc_size);
 156                 kfree(bo);
 157         }
 158 }
 159
 160 int ttm_bo_wait_unreserved(struct ttm_buffer_object *bo, bool interruptible)
 161 {
 162         if (interruptible) {
 163                 return wait_event_interruptible(bo->event_queue,
 164                                                atomic_read(&bo->reserved) == 0);
 165         } else {
 166                 wait_event(bo->event_queue, atomic_read(&bo->reserved) == 0);
 167                 return 0;
 168         }
 169 }
 170 EXPORT_SYMBOL(ttm_bo_wait_unreserved);
 171
 172 void ttm_bo_add_to_lru(struct ttm_buffer_object *bo)
 173 {
 174         struct ttm_bo_device *bdev = bo->bdev;
 175         struct ttm_mem_type_manager *man;
 176
 177         BUG_ON(!atomic_read(&bo->reserved));
 178
 179         if (!(bo->mem.placement & TTM_PL_FLAG_NO_EVICT)) {
 180
 181                 BUG_ON(!list_empty(&bo->lru));
 182
 183                 man = &bdev->man[bo->mem.mem_type];
 184                 list_add_tail(&bo->lru, &man->lru);
 185                 kref_get(&bo->list_kref);
 186
 187                 if (bo->ttm != NULL) {
 188                         list_add_tail(&bo->swap, &bo->glob->swap_lru);
 189                         kref_get(&bo->list_kref);
 190                 }
 191         }
 192 }
 193
 194 int ttm_bo_del_from_lru(struct ttm_buffer_object *bo)
 195 {
 196         int put_count = 0;
 197
 198         if (!list_empty(&bo->swap)) {
 199                 list_del_init(&bo->swap);
 200                 ++put_count;
 201         }
 202         if (!list_empty(&bo->lru)) {
 203                 list_del_init(&bo->lru);
 204                 ++put_count;
 205         }
 206
 207         /*
 208          * TODO: Add a driver hook to delete from
 209          * driver-specific LRU's here.
 210          */
 211
 212         return put_count;
 213 }
 214
 215 int ttm_bo_reserve_locked(struct ttm_buffer_object *bo,
 216                           bool interruptible,
 217                           bool no_wait, bool use_sequence, uint32_t sequence)
 218 {
 219         struct ttm_bo_global *glob = bo->glob;
 220         int ret;
 221
 222         while (unlikely(atomic_cmpxchg(&bo->reserved, 0, 1) != 0)) {
 223                 /**
 224                  * Deadlock avoidance for multi-bo reserving.
 225                  */
 226                 if (use_sequence && bo->seq_valid) {
 227                         /**
 228                          * We've already reserved this one.
 229                          */
 230                         if (unlikely(sequence == bo->val_seq))
 231                                 return -EDEADLK;
 232                         /**
 233                          * Already reserved by a thread that will not back
 234                          * off for us. We need to back off.
 235                          */
 236                         if (unlikely(sequence - bo->val_seq < (1 << 31)))
 237                                 return -EAGAIN;
 238                 }
 239
 240                 if (no_wait)
 241                         return -EBUSY;
 242
 243                 spin_unlock(&glob->lru_lock);
 244                 ret = ttm_bo_wait_unreserved(bo, interruptible);
 245                 spin_lock(&glob->lru_lock);
 246
 247                 if (unlikely(ret))
 248                         return ret;
 249         }
 250
 251         if (use_sequence) {
 252                 /**
 253                  * Wake up waiters that may need to recheck for deadlock,
 254                  * if we decreased the sequence number.
 255                  */
 256                 if (unlikely((bo->val_seq - sequence < (1 << 31))
 257                              || !bo->seq_valid))
 258                         wake_up_all(&bo->event_queue);
 259
 260                 bo->val_seq = sequence;
 261                 bo->seq_valid = true;
 262         } else {
 263                 bo->seq_valid = false;
 264         }
 265
 266         return 0;
 267 }
 268 EXPORT_SYMBOL(ttm_bo_reserve);
 269
 270 static void ttm_bo_ref_bug(struct kref *list_kref)
 271 {
 272         BUG();
 273 }
 274
 275 void ttm_bo_list_ref_sub(struct ttm_buffer_object *bo, int count,
 276                          bool never_free)
 277 {
 278         kref_sub(&bo->list_kref, count,
 279                  (never_free) ? ttm_bo_ref_bug : ttm_bo_release_list);
 280 }
 281
 282 int ttm_bo_reserve(struct ttm_buffer_object *bo,
 283                    bool interruptible,
 284                    bool no_wait, bool use_sequence, uint32_t sequence)
 285 {
 286         struct ttm_bo_global *glob = bo->glob;
 287         int put_count = 0;
 288         int ret;
 289
 290         spin_lock(&glob->lru_lock);
 291         ret = ttm_bo_reserve_locked(bo, interruptible, no_wait, use_sequence,
 292                                     sequence);
 293         if (likely(ret == 0))
 294                 put_count = ttm_bo_del_from_lru(bo);
 295         spin_unlock(&glob->lru_lock);
 296
 297         ttm_bo_list_ref_sub(bo, put_count, true);
 298
 299         return ret;
 300 }
 301
 302 void ttm_bo_unreserve_locked(struct ttm_buffer_object *bo)
 303 {
 304         ttm_bo_add_to_lru(bo);
 305         atomic_set(&bo->reserved, 0);
 306         wake_up_all(&bo->event_queue);
 307 }
 308
 309 void ttm_bo_unreserve(struct ttm_buffer_object *bo)
 310 {
 311         struct ttm_bo_global *glob = bo->glob;
 312
 313         spin_lock(&glob->lru_lock);
 314         ttm_bo_unreserve_locked(bo);
 315         spin_unlock(&glob->lru_lock);
 316 }
 317 EXPORT_SYMBOL(ttm_bo_unreserve);
 318
 319 /*
 320  * Call bo->mutex locked.
 321  */
 322 static int ttm_bo_add_ttm(struct ttm_buffer_object *bo, bool zero_alloc)
 323 {
 324         struct ttm_bo_device *bdev = bo->bdev;
 325         struct ttm_bo_global *glob = bo->glob;
 326         int ret = 0;
 327         uint32_t page_flags = 0;
 328
 329         TTM_ASSERT_LOCKED(&bo->mutex);
 330         bo->ttm = NULL;
 331
 332         if (bdev->need_dma32)
 333                 page_flags |= TTM_PAGE_FLAG_DMA32;
 334
 335         switch (bo->type) {
 336         case ttm_bo_type_device:
 337                 if (zero_alloc)
 338                         page_flags |= TTM_PAGE_FLAG_ZERO_ALLOC;
 339         case ttm_bo_type_kernel:
 340                 bo->ttm = ttm_tt_create(bdev, bo->num_pages << PAGE_SHIFT,
 341                                         page_flags, glob->dummy_read_page);
 342                 if (unlikely(bo->ttm == NULL))
 343                         ret = -ENOMEM;
 344                 break;
 345         case ttm_bo_type_user:
 346                 bo->ttm = ttm_tt_create(bdev, bo->num_pages << PAGE_SHIFT,
 347                                         page_flags | TTM_PAGE_FLAG_USER,
 348                                         glob->dummy_read_page);
 349                 if (unlikely(bo->ttm == NULL)) {
 350                         ret = -ENOMEM;
 351                         break;
 352                 }
 353
 354                 ret = ttm_tt_set_user(bo->ttm, current,
 355                                       bo->buffer_start, bo->num_pages);
 356                 if (unlikely(ret != 0))
 357                         ttm_tt_destroy(bo->ttm);
 358                 break;
 359         default:
 360                 printk(KERN_ERR TTM_PFX "Illegal buffer object type\n");
 361                 ret = -EINVAL;
 362                 break;
 363         }
 364
 365         return ret;
 366 }
 367
 368 static int ttm_bo_handle_move_mem(struct ttm_buffer_object *bo,
 369                                   struct ttm_mem_reg *mem,
 370                                   bool evict, bool interruptible,
 371                                   bool no_wait_reserve, bool no_wait_gpu)
 372 {
 373         struct ttm_bo_device *bdev = bo->bdev;
 374         bool old_is_pci = ttm_mem_reg_is_pci(bdev, &bo->mem);
 375         bool new_is_pci = ttm_mem_reg_is_pci(bdev, mem);
 376         struct ttm_mem_type_manager *old_man = &bdev->man[bo->mem.mem_type];
 377         struct ttm_mem_type_manager *new_man = &bdev->man[mem->mem_type];
 378         int ret = 0;
 379
 380         if (old_is_pci || new_is_pci ||
 381             ((mem->placement & bo->mem.placement & TTM_PL_MASK_CACHING) == 0)) {
 382                 ret = ttm_mem_io_lock(old_man, true);
 383                 if (unlikely(ret != 0))
 384                         goto out_err;
 385                 ttm_bo_unmap_virtual_locked(bo);
 386                 ttm_mem_io_unlock(old_man);
 387         }
 388
 389         /*
 390          * Create and bind a ttm if required.
 391          */
 392
 393         if (!(new_man->flags & TTM_MEMTYPE_FLAG_FIXED) && (bo->ttm == NULL)) {
 394                 ret = ttm_bo_add_ttm(bo, false);
 395                 if (ret)
 396                         goto out_err;
 397
 398                 ret = ttm_tt_set_placement_caching(bo->ttm, mem->placement);
 399                 if (ret)
 400                         goto out_err;
 401
 402                 if (mem->mem_type != TTM_PL_SYSTEM) {
 403                         ret = ttm_tt_bind(bo->ttm, mem);
 404                         if (ret)
 405                                 goto out_err;
 406                 }
 407
 408                 if (bo->mem.mem_type == TTM_PL_SYSTEM) {
 409                         bo->mem = *mem;
 410                         mem->mm_node = NULL;
 411                         goto moved;
 412                 }
 413
 414         }
 415
 416         if (bdev->driver->move_notify)
 417                 bdev->driver->move_notify(bo, mem);
 418
 419         if (!(old_man->flags & TTM_MEMTYPE_FLAG_FIXED) &&
 420             !(new_man->flags & TTM_MEMTYPE_FLAG_FIXED))
 421                 ret = ttm_bo_move_ttm(bo, evict, no_wait_reserve, no_wait_gpu, mem);
 422         else if (bdev->driver->move)
 423                 ret = bdev->driver->move(bo, evict, interruptible,
 424                                          no_wait_reserve, no_wait_gpu, mem);
 425         else
 426                 ret = ttm_bo_move_memcpy(bo, evict, no_wait_reserve, no_wait_gpu, mem);
 427
 428         if (ret)
 429                 goto out_err;
 430
 431 moved:
 432         if (bo->evicted) {
 433                 ret = bdev->driver->invalidate_caches(bdev, bo->mem.placement);
 434                 if (ret)
 435                         printk(KERN_ERR TTM_PFX "Can not flush read caches\n");
 436                 bo->evicted = false;
 437         }
 438
 439         if (bo->mem.mm_node) {
 440                 bo->offset = (bo->mem.start << PAGE_SHIFT) +
 441                     bdev->man[bo->mem.mem_type].gpu_offset;
 442                 bo->cur_placement = bo->mem.placement;
 443         } else
 444                 bo->offset = 0;
 445
 446         return 0;
 447
 448 out_err:
 449         new_man = &bdev->man[bo->mem.mem_type];
 450         if ((new_man->flags & TTM_MEMTYPE_FLAG_FIXED) && bo->ttm) {
 451                 ttm_tt_unbind(bo->ttm);
 452                 ttm_tt_destroy(bo->ttm);
 453                 bo->ttm = NULL;
 454         }
 455
 456         return ret;
 457 }
 458
 459 /**
 460  * Call bo::reserved.
 461  * Will release GPU memory type usage on destruction.
 462  * This is the place to put in driver specific hooks to release
 463  * driver private resources.
 464  * Will release the bo::reserved lock.
 465  */
 466
 467 static void ttm_bo_cleanup_memtype_use(struct ttm_buffer_object *bo)
 468 {
 469         if (bo->ttm) {
 470                 ttm_tt_unbind(bo->ttm);
 471                 ttm_tt_destroy(bo->ttm);
 472                 bo->ttm = NULL;
 473         }
 474         ttm_bo_mem_put(bo, &bo->mem);
 475
 476         atomic_set(&bo->reserved, 0);
 477
 478         /*
 479          * Make processes trying to reserve really pick it up.
 480          */
 481         smp_mb__after_atomic_dec();
 482         wake_up_all(&bo->event_queue);
 483 }
 484
 485 static void ttm_bo_cleanup_refs_or_queue(struct ttm_buffer_object *bo)
 486 {
 487         struct ttm_bo_device *bdev = bo->bdev;
 488         struct ttm_bo_global *glob = bo->glob;
 489         struct ttm_bo_driver *driver;
 490         void *sync_obj = NULL;
 491         void *sync_obj_arg;
 492         int put_count;
 493         int ret;
 494
 495         spin_lock(&bdev->fence_lock);
 496         (void) ttm_bo_wait(bo, false, false, true);
 497         if (!bo->sync_obj) {
 498
 499                 spin_lock(&glob->lru_lock);
 500
 501                 /**
 502                  * Lock inversion between bo:reserve and bdev::fence_lock here,
 503                  * but that's OK, since we're only trylocking.
 504                  */
 505
 506                 ret = ttm_bo_reserve_locked(bo, false, true, false, 0);
 507
 508                 if (unlikely(ret == -EBUSY))
 509                         goto queue;
 510
 511                 spin_unlock(&bdev->fence_lock);
 512                 put_count = ttm_bo_del_from_lru(bo);
 513
 514                 spin_unlock(&glob->lru_lock);
 515                 ttm_bo_cleanup_memtype_use(bo);
 516
 517                 ttm_bo_list_ref_sub(bo, put_count, true);
 518
 519                 return;
 520         } else {
 521                 spin_lock(&glob->lru_lock);
 522         }
 523 queue:
 524         driver = bdev->driver;
 525         if (bo->sync_obj)
 526                 sync_obj = driver->sync_obj_ref(bo->sync_obj);
 527         sync_obj_arg = bo->sync_obj_arg;
 528
 529         kref_get(&bo->list_kref);
 530         list_add_tail(&bo->ddestroy, &bdev->ddestroy);
 531         spin_unlock(&glob->lru_lock);
 532         spin_unlock(&bdev->fence_lock);
 533
 534         if (sync_obj) {
 535                 driver->sync_obj_flush(sync_obj, sync_obj_arg);
 536                 driver->sync_obj_unref(&sync_obj);
 537         }
 538         schedule_delayed_work(&bdev->wq,
 539                               ((HZ / 100) < 1) ? 1 : HZ / 100);
 540 }
 541
 542 /**
 543  * function ttm_bo_cleanup_refs
 544  * If bo idle, remove from delayed- and lru lists, and unref.
 545  * If not idle, do nothing.
 546  *
 547  * @interruptible         Any sleeps should occur interruptibly.
 548  * @no_wait_reserve       Never wait for reserve. Return -EBUSY instead.
 549  * @no_wait_gpu           Never wait for gpu. Return -EBUSY instead.
 550  */
 551
 552 static int ttm_bo_cleanup_refs(struct ttm_buffer_object *bo,
 553                                bool interruptible,
 554                                bool no_wait_reserve,
 555                                bool no_wait_gpu)
 556 {
 557         struct ttm_bo_device *bdev = bo->bdev;
 558         struct ttm_bo_global *glob = bo->glob;
 559         int put_count;
 560         int ret = 0;
 561
 562 retry:
 563         spin_lock(&bdev->fence_lock);
 564         ret = ttm_bo_wait(bo, false, interruptible, no_wait_gpu);
 565         spin_unlock(&bdev->fence_lock);
 566
 567         if (unlikely(ret != 0))
 568                 return ret;
 569
 570         spin_lock(&glob->lru_lock);
 571         ret = ttm_bo_reserve_locked(bo, interruptible,
 572                                     no_wait_reserve, false, 0);
 573
 574         if (unlikely(ret != 0) || list_empty(&bo->ddestroy)) {
 575                 spin_unlock(&glob->lru_lock);
 576                 return ret;
 577         }
 578
 579         /**
 580          * We can re-check for sync object without taking
 581          * the bo::lock since setting the sync object requires
 582          * also bo::reserved. A busy object at this point may
 583          * be caused by another thread recently starting an accelerated
 584          * eviction.
 585          */
 586
 587         if (unlikely(bo->sync_obj)) {
 588                 atomic_set(&bo->reserved, 0);
 589                 wake_up_all(&bo->event_queue);
 590                 spin_unlock(&glob->lru_lock);
 591                 goto retry;
 592         }
 593
 594         put_count = ttm_bo_del_from_lru(bo);
 595         list_del_init(&bo->ddestroy);
 596         ++put_count;
 597
 598         spin_unlock(&glob->lru_lock);
 599         ttm_bo_cleanup_memtype_use(bo);
 600
 601         ttm_bo_list_ref_sub(bo, put_count, true);
 602
 603         return 0;
 604 }
 605
 606 /**
 607  * Traverse the delayed list, and call ttm_bo_cleanup_refs on all
 608  * encountered buffers.
 609  */
 610
 611 static int ttm_bo_delayed_delete(struct ttm_bo_device *bdev, bool remove_all)
 612 {
 613         struct ttm_bo_global *glob = bdev->glob;
 614         struct ttm_buffer_object *entry = NULL;
 615         int ret = 0;
 616
 617         spin_lock(&glob->lru_lock);
 618         if (list_empty(&bdev->ddestroy))
 619                 goto out_unlock;
 620
 621         entry = list_first_entry(&bdev->ddestroy,
 622                 struct ttm_buffer_object, ddestroy);
 623         kref_get(&entry->list_kref);
 624
 625         for (;;) {
 626                 struct ttm_buffer_object *nentry = NULL;
 627
 628                 if (entry->ddestroy.next != &bdev->ddestroy) {
 629                         nentry = list_first_entry(&entry->ddestroy,
 630                                 struct ttm_buffer_object, ddestroy);
 631                         kref_get(&nentry->list_kref);
 632                 }
 633
 634                 spin_unlock(&glob->lru_lock);
 635                 ret = ttm_bo_cleanup_refs(entry, false, !remove_all,
 636                                           !remove_all);
 637                 kref_put(&entry->list_kref, ttm_bo_release_list);
 638                 entry = nentry;
 639
 640                 if (ret || !entry)
 641                         goto out;
 642
 643                 spin_lock(&glob->lru_lock);
 644                 if (list_empty(&entry->ddestroy))
 645                         break;
 646         }
 647
 648 out_unlock:
 649         spin_unlock(&glob->lru_lock);
 650 out:
 651         if (entry)
 652                 kref_put(&entry->list_kref, ttm_bo_release_list);
 653         return ret;
 654 }
 655
 656 static void ttm_bo_delayed_workqueue(struct work_struct *work)
 657 {
 658         struct ttm_bo_device *bdev =
 659             container_of(work, struct ttm_bo_device, wq.work);
 660
 661         if (ttm_bo_delayed_delete(bdev, false)) {
 662                 schedule_delayed_work(&bdev->wq,
 663                                       ((HZ / 100) < 1) ? 1 : HZ / 100);
 664         }
 665 }
 666
 667 static void ttm_bo_release(struct kref *kref)
 668 {
 669         struct ttm_buffer_object *bo =
 670             container_of(kref, struct ttm_buffer_object, kref);
 671         struct ttm_bo_device *bdev = bo->bdev;
 672         struct ttm_mem_type_manager *man = &bdev->man[bo->mem.mem_type];
 673
 674         if (likely(bo->vm_node != NULL)) {
 675                 rb_erase(&bo->vm_rb, &bdev->addr_space_rb);
 676                 drm_mm_put_block(bo->vm_node);
 677                 bo->vm_node = NULL;
 678         }
 679         write_unlock(&bdev->vm_lock);
 680         ttm_mem_io_lock(man, false);
 681         ttm_mem_io_free_vm(bo);
 682         ttm_mem_io_unlock(man);
 683         ttm_bo_cleanup_refs_or_queue(bo);
 684         kref_put(&bo->list_kref, ttm_bo_release_list);
 685         write_lock(&bdev->vm_lock);
 686 }
 687
 688 void ttm_bo_unref(struct ttm_buffer_object **p_bo)
 689 {
 690         struct ttm_buffer_object *bo = *p_bo;
 691         struct ttm_bo_device *bdev = bo->bdev;
 692
 693         *p_bo = NULL;
 694         write_lock(&bdev->vm_lock);
 695         kref_put(&bo->kref, ttm_bo_release);
 696         write_unlock(&bdev->vm_lock);
 697 }
 698 EXPORT_SYMBOL(ttm_bo_unref);
 699
 700 int ttm_bo_lock_delayed_workqueue(struct ttm_bo_device *bdev)
 701 {
 702         return cancel_delayed_work_sync(&bdev->wq);
 703 }
 704 EXPORT_SYMBOL(ttm_bo_lock_delayed_workqueue);
 705
 706 void ttm_bo_unlock_delayed_workqueue(struct ttm_bo_device *bdev, int resched)
 707 {
 708         if (resched)
 709                 schedule_delayed_work(&bdev->wq,
 710                                       ((HZ / 100) < 1) ? 1 : HZ / 100);
 711 }
 712 EXPORT_SYMBOL(ttm_bo_unlock_delayed_workqueue);
 713
 714 static int ttm_bo_evict(struct ttm_buffer_object *bo, bool interruptible,
 715                         bool no_wait_reserve, bool no_wait_gpu)
 716 {
 717         struct ttm_bo_device *bdev = bo->bdev;
 718         struct ttm_mem_reg evict_mem;
 719         struct ttm_placement placement;
 720         int ret = 0;
 721
 722         spin_lock(&bdev->fence_lock);
 723         ret = ttm_bo_wait(bo, false, interruptible, no_wait_gpu);
 724         spin_unlock(&bdev->fence_lock);
 725
 726         if (unlikely(ret != 0)) {
 727                 if (ret != -ERESTARTSYS) {
 728                         printk(KERN_ERR TTM_PFX
 729                                "Failed to expire sync object before "
 730                                "buffer eviction.\n");
 731                 }
 732                 goto out;
 733         }
 734
 735         BUG_ON(!atomic_read(&bo->reserved));
 736
 737         evict_mem = bo->mem;
 738         evict_mem.mm_node = NULL;
 739         evict_mem.bus.io_reserved_vm = false;
 740         evict_mem.bus.io_reserved_count = 0;
 741
 742         placement.fpfn = 0;
 743         placement.lpfn = 0;
 744         placement.num_placement = 0;
 745         placement.num_busy_placement = 0;
 746         bdev->driver->evict_flags(bo, &placement);
 747         ret = ttm_bo_mem_space(bo, &placement, &evict_mem, interruptible,
 748                                 no_wait_reserve, no_wait_gpu);
 749         if (ret) {
 750                 if (ret != -ERESTARTSYS) {
 751                         printk(KERN_ERR TTM_PFX
 752                                "Failed to find memory space for "
 753                                "buffer 0x%p eviction.\n", bo);
 754                         ttm_bo_mem_space_debug(bo, &placement);
 755                 }
 756                 goto out;
 757         }
 758
 759         ret = ttm_bo_handle_move_mem(bo, &evict_mem, true, interruptible,
 760                                      no_wait_reserve, no_wait_gpu);
 761         if (ret) {
 762                 if (ret != -ERESTARTSYS)
 763                         printk(KERN_ERR TTM_PFX "Buffer eviction failed\n");
 764                 ttm_bo_mem_put(bo, &evict_mem);
 765                 goto out;
 766         }
 767         bo->evicted = true;
 768 out:
 769         return ret;
 770 }
 771
 772 static int ttm_mem_evict_first(struct ttm_bo_device *bdev,
 773                                 uint32_t mem_type,
 774                                 bool interruptible, bool no_wait_reserve,
 775                                 bool no_wait_gpu)
 776 {
 777         struct ttm_bo_global *glob = bdev->glob;
 778         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
 779         struct ttm_buffer_object *bo;
 780         int ret, put_count = 0;
 781
 782 retry:
 783         spin_lock(&glob->lru_lock);
 784         if (list_empty(&man->lru)) {
 785                 spin_unlock(&glob->lru_lock);
 786                 return -EBUSY;
 787         }
 788
 789         bo = list_first_entry(&man->lru, struct ttm_buffer_object, lru);
 790         kref_get(&bo->list_kref);
 791
 792         if (!list_empty(&bo->ddestroy)) {
 793                 spin_unlock(&glob->lru_lock);
 794                 ret = ttm_bo_cleanup_refs(bo, interruptible,
 795                                           no_wait_reserve, no_wait_gpu);
 796                 kref_put(&bo->list_kref, ttm_bo_release_list);
 797
 798                 if (likely(ret == 0 || ret == -ERESTARTSYS))
 799                         return ret;
 800
 801                 goto retry;
 802         }
 803
 804         ret = ttm_bo_reserve_locked(bo, false, no_wait_reserve, false, 0);
 805
 806         if (unlikely(ret == -EBUSY)) {
 807                 spin_unlock(&glob->lru_lock);
 808                 if (likely(!no_wait_gpu))
 809                         ret = ttm_bo_wait_unreserved(bo, interruptible);
 810
 811                 kref_put(&bo->list_kref, ttm_bo_release_list);
 812
 813                 /**
 814                  * We *need* to retry after releasing the lru lock.
 815                  */
 816
 817                 if (unlikely(ret != 0))
 818                         return ret;
 819                 goto retry;
 820         }
 821
 822         put_count = ttm_bo_del_from_lru(bo);
 823         spin_unlock(&glob->lru_lock);
 824
 825         BUG_ON(ret != 0);
 826
 827         ttm_bo_list_ref_sub(bo, put_count, true);
 828
 829         ret = ttm_bo_evict(bo, interruptible, no_wait_reserve, no_wait_gpu);
 830         ttm_bo_unreserve(bo);
 831
 832         kref_put(&bo->list_kref, ttm_bo_release_list);
 833         return ret;
 834 }
 835
 836 void ttm_bo_mem_put(struct ttm_buffer_object *bo, struct ttm_mem_reg *mem)
 837 {
 838         struct ttm_mem_type_manager *man = &bo->bdev->man[mem->mem_type];
 839
 840         if (mem->mm_node)
 841                 (*man->func->put_node)(man, mem);
 842 }
 843 EXPORT_SYMBOL(ttm_bo_mem_put);
 844
 845 /**
 846  * Repeatedly evict memory from the LRU for @mem_type until we create enough
 847  * space, or we've evicted everything and there isn't enough space.
 848  */
 849 static int ttm_bo_mem_force_space(struct ttm_buffer_object *bo,
 850                                         uint32_t mem_type,
 851                                         struct ttm_placement *placement,
 852                                         struct ttm_mem_reg *mem,
 853                                         bool interruptible,
 854                                         bool no_wait_reserve,
 855                                         bool no_wait_gpu)
 856 {
 857         struct ttm_bo_device *bdev = bo->bdev;
 858         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
 859         int ret;
 860
 861         do {
 862                 ret = (*man->func->get_node)(man, bo, placement, mem);
 863                 if (unlikely(ret != 0))
 864                         return ret;
 865                 if (mem->mm_node)
 866                         break;
 867                 ret = ttm_mem_evict_first(bdev, mem_type, interruptible,
 868                                                 no_wait_reserve, no_wait_gpu);
 869                 if (unlikely(ret != 0))
 870                         return ret;
 871         } while (1);
 872         if (mem->mm_node == NULL)
 873                 return -ENOMEM;
 874         mem->mem_type = mem_type;
 875         return 0;
 876 }
 877
 878 static uint32_t ttm_bo_select_caching(struct ttm_mem_type_manager *man,
 879                                       uint32_t cur_placement,
 880                                       uint32_t proposed_placement)
 881 {
 882         uint32_t caching = proposed_placement & TTM_PL_MASK_CACHING;
 883         uint32_t result = proposed_placement & ~TTM_PL_MASK_CACHING;
 884
 885         /**
 886          * Keep current caching if possible.
 887          */
 888
 889         if ((cur_placement & caching) != 0)
 890                 result |= (cur_placement & caching);
 891         else if ((man->default_caching & caching) != 0)
 892                 result |= man->default_caching;
 893         else if ((TTM_PL_FLAG_CACHED & caching) != 0)
 894                 result |= TTM_PL_FLAG_CACHED;
 895         else if ((TTM_PL_FLAG_WC & caching) != 0)
 896                 result |= TTM_PL_FLAG_WC;
 897         else if ((TTM_PL_FLAG_UNCACHED & caching) != 0)
 898                 result |= TTM_PL_FLAG_UNCACHED;
 899
 900         return result;
 901 }
 902
 903 static bool ttm_bo_mt_compatible(struct ttm_mem_type_manager *man,
 904                                  bool disallow_fixed,
 905                                  uint32_t mem_type,
 906                                  uint32_t proposed_placement,
 907                                  uint32_t *masked_placement)
 908 {
 909         uint32_t cur_flags = ttm_bo_type_flags(mem_type);
 910
 911         if ((man->flags & TTM_MEMTYPE_FLAG_FIXED) && disallow_fixed)
 912                 return false;
 913
 914         if ((cur_flags & proposed_placement & TTM_PL_MASK_MEM) == 0)
 915                 return false;
 916
 917         if ((proposed_placement & man->available_caching) == 0)
 918                 return false;
 919
 920         cur_flags |= (proposed_placement & man->available_caching);
 921
 922         *masked_placement = cur_flags;
 923         return true;
 924 }
 925
 926 /**
 927  * Creates space for memory region @mem according to its type.
 928  *
 929  * This function first searches for free space in compatible memory types in
 930  * the priority order defined by the driver.  If free space isn't found, then
 931  * ttm_bo_mem_force_space is attempted in priority order to evict and find
 932  * space.
 933  */
 934 int ttm_bo_mem_space(struct ttm_buffer_object *bo,
 935                         struct ttm_placement *placement,
 936                         struct ttm_mem_reg *mem,
 937                         bool interruptible, bool no_wait_reserve,
 938                         bool no_wait_gpu)
 939 {
 940         struct ttm_bo_device *bdev = bo->bdev;
 941         struct ttm_mem_type_manager *man;
 942         uint32_t mem_type = TTM_PL_SYSTEM;
 943         uint32_t cur_flags = 0;
 944         bool type_found = false;
 945         bool type_ok = false;
 946         bool has_erestartsys = false;
 947         int i, ret;
 948
 949         mem->mm_node = NULL;
 950         for (i = 0; i < placement->num_placement; ++i) {
 951                 ret = ttm_mem_type_from_flags(placement->placement[i],
 952                                                 &mem_type);
 953                 if (ret)
 954                         return ret;
 955                 man = &bdev->man[mem_type];
 956
 957                 type_ok = ttm_bo_mt_compatible(man,
 958                                                 bo->type == ttm_bo_type_user,
 959                                                 mem_type,
 960                                                 placement->placement[i],
 961                                                 &cur_flags);
 962
 963                 if (!type_ok)
 964                         continue;
 965
 966                 cur_flags = ttm_bo_select_caching(man, bo->mem.placement,
 967                                                   cur_flags);
 968                 /*
 969                  * Use the access and other non-mapping-related flag bits from
 970                  * the memory placement flags to the current flags
 971                  */
 972                 ttm_flag_masked(&cur_flags, placement->placement[i],
 973                                 ~TTM_PL_MASK_MEMTYPE);
 974
 975                 if (mem_type == TTM_PL_SYSTEM)
 976                         break;
 977
 978                 if (man->has_type && man->use_type) {
 979                         type_found = true;
 980                         ret = (*man->func->get_node)(man, bo, placement, mem);
 981                         if (unlikely(ret))
 982                                 return ret;
 983                 }
 984                 if (mem->mm_node)
 985                         break;
 986         }
 987
 988         if ((type_ok && (mem_type == TTM_PL_SYSTEM)) || mem->mm_node) {
 989                 mem->mem_type = mem_type;
 990                 mem->placement = cur_flags;
 991                 return 0;
 992         }
 993
 994         if (!type_found)
 995                 return -EINVAL;
 996
 997         for (i = 0; i < placement->num_busy_placement; ++i) {
 998                 ret = ttm_mem_type_from_flags(placement->busy_placement[i],
 999                                                 &mem_type);
1000                 if (ret)
1001                         return ret;
1002                 man = &bdev->man[mem_type];
1003                 if (!man->has_type)
1004                         continue;
1005                 if (!ttm_bo_mt_compatible(man,
1006                                                 bo->type == ttm_bo_type_user,
1007                                                 mem_type,
1008                                                 placement->busy_placement[i],
1009                                                 &cur_flags))
1010                         continue;
1011
1012                 cur_flags = ttm_bo_select_caching(man, bo->mem.placement,
1013                                                   cur_flags);
1014                 /*
1015                  * Use the access and other non-mapping-related flag bits from
1016                  * the memory placement flags to the current flags
1017                  */
1018                 ttm_flag_masked(&cur_flags, placement->busy_placement[i],
1019                                 ~TTM_PL_MASK_MEMTYPE);
1020
1021
1022                 if (mem_type == TTM_PL_SYSTEM) {
1023                         mem->mem_type = mem_type;
1024                         mem->placement = cur_flags;
1025                         mem->mm_node = NULL;
1026                         return 0;
1027                 }
1028
1029                 ret = ttm_bo_mem_force_space(bo, mem_type, placement, mem,
1030                                                 interruptible, no_wait_reserve, no_wait_gpu);
1031                 if (ret == 0 && mem->mm_node) {
1032                         mem->placement = cur_flags;
1033                         return 0;
1034                 }
1035                 if (ret == -ERESTARTSYS)
1036                         has_erestartsys = true;
1037         }
1038         ret = (has_erestartsys) ? -ERESTARTSYS : -ENOMEM;
1039         return ret;
1040 }
1041 EXPORT_SYMBOL(ttm_bo_mem_space);
1042
1043 int ttm_bo_wait_cpu(struct ttm_buffer_object *bo, bool no_wait)
1044 {
1045         if ((atomic_read(&bo->cpu_writers) > 0) && no_wait)
1046                 return -EBUSY;
1047
1048         return wait_event_interruptible(bo->event_queue,
1049                                         atomic_read(&bo->cpu_writers) == 0);
1050 }
1051 EXPORT_SYMBOL(ttm_bo_wait_cpu);
1052
1053 int ttm_bo_move_buffer(struct ttm_buffer_object *bo,
1054                         struct ttm_placement *placement,
1055                         bool interruptible, bool no_wait_reserve,
1056                         bool no_wait_gpu)
1057 {
1058         int ret = 0;
1059         struct ttm_mem_reg mem;
1060         struct ttm_bo_device *bdev = bo->bdev;
1061
1062         BUG_ON(!atomic_read(&bo->reserved));
1063
1064         /*
1065          * FIXME: It's possible to pipeline buffer moves.
1066          * Have the driver move function wait for idle when necessary,
1067          * instead of doing it here.
1068          */
1069         spin_lock(&bdev->fence_lock);
1070         ret = ttm_bo_wait(bo, false, interruptible, no_wait_gpu);
1071         spin_unlock(&bdev->fence_lock);
1072         if (ret)
1073                 return ret;
1074         mem.num_pages = bo->num_pages;
1075         mem.size = mem.num_pages << PAGE_SHIFT;
1076         mem.page_alignment = bo->mem.page_alignment;
1077         mem.bus.io_reserved_vm = false;
1078         mem.bus.io_reserved_count = 0;
1079         /*
1080          * Determine where to move the buffer.
1081          */
1082         ret = ttm_bo_mem_space(bo, placement, &mem, interruptible, no_wait_reserve, no_wait_gpu);
1083         if (ret)
1084                 goto out_unlock;
1085         ret = ttm_bo_handle_move_mem(bo, &mem, false, interruptible, no_wait_reserve, no_wait_gpu);
1086 out_unlock:
1087         if (ret && mem.mm_node)
1088                 ttm_bo_mem_put(bo, &mem);
1089         return ret;
1090 }
1091
1092 static int ttm_bo_mem_compat(struct ttm_placement *placement,
1093                              struct ttm_mem_reg *mem)
1094 {
1095         int i;
1096
1097         if (mem->mm_node && placement->lpfn != 0 &&
1098             (mem->start < placement->fpfn ||
1099              mem->start + mem->num_pages > placement->lpfn))
1100                 return -1;
1101
1102         for (i = 0; i < placement->num_placement; i++) {
1103                 if ((placement->placement[i] & mem->placement &
1104                         TTM_PL_MASK_CACHING) &&
1105                         (placement->placement[i] & mem->placement &
1106                         TTM_PL_MASK_MEM))
1107                         return i;
1108         }
1109         return -1;
1110 }
1111
1112 int ttm_bo_validate(struct ttm_buffer_object *bo,
1113                         struct ttm_placement *placement,
1114                         bool interruptible, bool no_wait_reserve,
1115                         bool no_wait_gpu)
1116 {
1117         int ret;
1118
1119         BUG_ON(!atomic_read(&bo->reserved));
1120         /* Check that range is valid */
1121         if (placement->lpfn || placement->fpfn)
1122                 if (placement->fpfn > placement->lpfn ||
1123                         (placement->lpfn - placement->fpfn) < bo->num_pages)
1124                         return -EINVAL;
1125         /*
1126          * Check whether we need to move buffer.
1127          */
1128         ret = ttm_bo_mem_compat(placement, &bo->mem);
1129         if (ret < 0) {
1130                 ret = ttm_bo_move_buffer(bo, placement, interruptible, no_wait_reserve, no_wait_gpu);
1131                 if (ret)
1132                         return ret;
1133         } else {
1134                 /*
1135                  * Use the access and other non-mapping-related flag bits from
1136                  * the compatible memory placement flags to the active flags
1137                  */
1138                 ttm_flag_masked(&bo->mem.placement, placement->placement[ret],
1139                                 ~TTM_PL_MASK_MEMTYPE);
1140         }
1141         /*
1142          * We might need to add a TTM.
1143          */
1144         if (bo->mem.mem_type == TTM_PL_SYSTEM && bo->ttm == NULL) {
1145                 ret = ttm_bo_add_ttm(bo, true);
1146                 if (ret)
1147                         return ret;
1148         }
1149         return 0;
1150 }
1151 EXPORT_SYMBOL(ttm_bo_validate);
1152
1153 int ttm_bo_check_placement(struct ttm_buffer_object *bo,
1154                                 struct ttm_placement *placement)
1155 {
1156         BUG_ON((placement->fpfn || placement->lpfn) &&
1157                (bo->mem.num_pages > (placement->lpfn - placement->fpfn)));
1158
1159         return 0;
1160 }
1161
1162 int ttm_bo_init(struct ttm_bo_device *bdev,
1163                 struct ttm_buffer_object *bo,
1164                 unsigned long size,
1165                 enum ttm_bo_type type,
1166                 struct ttm_placement *placement,
1167                 uint32_t page_alignment,
1168                 unsigned long buffer_start,
1169                 bool interruptible,
1170                 struct file *persistant_swap_storage,
1171                 size_t acc_size,
1172                 void (*destroy) (struct ttm_buffer_object *))
1173 {
1174         int ret = 0;
1175         unsigned long num_pages;
1176
1177         size += buffer_start & ~PAGE_MASK;
1178         num_pages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
1179         if (num_pages == 0) {
1180                 printk(KERN_ERR TTM_PFX "Illegal buffer object size.\n");
1181                 if (destroy)
1182                         (*destroy)(bo);
1183                 else
1184                         kfree(bo);
1185                 return -EINVAL;
1186         }
1187         bo->destroy = destroy;
1188
1189         kref_init(&bo->kref);
1190         kref_init(&bo->list_kref);
1191         atomic_set(&bo->cpu_writers, 0);
1192         atomic_set(&bo->reserved, 1);
1193         init_waitqueue_head(&bo->event_queue);
1194         INIT_LIST_HEAD(&bo->lru);
1195         INIT_LIST_HEAD(&bo->ddestroy);
1196         INIT_LIST_HEAD(&bo->swap);
1197         INIT_LIST_HEAD(&bo->io_reserve_lru);
1198         bo->bdev = bdev;
1199         bo->glob = bdev->glob;
1200         bo->type = type;
1201         bo->num_pages = num_pages;
1202         bo->mem.size = num_pages << PAGE_SHIFT;
1203         bo->mem.mem_type = TTM_PL_SYSTEM;
1204         bo->mem.num_pages = bo->num_pages;
1205         bo->mem.mm_node = NULL;
1206         bo->mem.page_alignment = page_alignment;
1207         bo->mem.bus.io_reserved_vm = false;
1208         bo->mem.bus.io_reserved_count = 0;
1209         bo->buffer_start = buffer_start & PAGE_MASK;
1210         bo->priv_flags = 0;
1211         bo->mem.placement = (TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED);
1212         bo->seq_valid = false;
1213         bo->persistant_swap_storage = persistant_swap_storage;
1214         bo->acc_size = acc_size;
1215         atomic_inc(&bo->glob->bo_count);
1216
1217         ret = ttm_bo_check_placement(bo, placement);
1218         if (unlikely(ret != 0))
1219                 goto out_err;
1220
1221         /*
1222          * For ttm_bo_type_device buffers, allocate
1223          * address space from the device.
1224          */
1225         if (bo->type == ttm_bo_type_device) {
1226                 ret = ttm_bo_setup_vm(bo);
1227                 if (ret)
1228                         goto out_err;
1229         }
1230
1231         ret = ttm_bo_validate(bo, placement, interruptible, false, false);
1232         if (ret)
1233                 goto out_err;
1234
1235         ttm_bo_unreserve(bo);
1236         return 0;
1237
1238 out_err:
1239         ttm_bo_unreserve(bo);
1240         ttm_bo_unref(&bo);
1241
1242         return ret;
1243 }
1244 EXPORT_SYMBOL(ttm_bo_init);
1245
1246 static inline size_t ttm_bo_size(struct ttm_bo_global *glob,
1247                                  unsigned long num_pages)
1248 {
1249         size_t page_array_size = (num_pages * sizeof(void *) + PAGE_SIZE - 1) &
1250             PAGE_MASK;
1251
1252         return glob->ttm_bo_size + 2 * page_array_size;
1253 }
1254
1255 int ttm_bo_create(struct ttm_bo_device *bdev,
1256                         unsigned long size,
1257                         enum ttm_bo_type type,
1258                         struct ttm_placement *placement,
1259                         uint32_t page_alignment,
1260                         unsigned long buffer_start,
1261                         bool interruptible,
1262                         struct file *persistant_swap_storage,
1263                         struct ttm_buffer_object **p_bo)
1264 {
1265         struct ttm_buffer_object *bo;
1266         struct ttm_mem_global *mem_glob = bdev->glob->mem_glob;
1267         int ret;
1268
1269         size_t acc_size =
1270             ttm_bo_size(bdev->glob, (size + PAGE_SIZE - 1) >> PAGE_SHIFT);
1271         ret = ttm_mem_global_alloc(mem_glob, acc_size, false, false);
1272         if (unlikely(ret != 0))
1273                 return ret;
1274
1275         bo = kzalloc(sizeof(*bo), GFP_KERNEL);
1276
1277         if (unlikely(bo == NULL)) {
1278                 ttm_mem_global_free(mem_glob, acc_size);
1279                 return -ENOMEM;
1280         }
1281
1282         ret = ttm_bo_init(bdev, bo, size, type, placement, page_alignment,
1283                                 buffer_start, interruptible,
1284                                 persistant_swap_storage, acc_size, NULL);
1285         if (likely(ret == 0))
1286                 *p_bo = bo;
1287
1288         return ret;
1289 }
1290
1291 static int ttm_bo_force_list_clean(struct ttm_bo_device *bdev,
1292                                         unsigned mem_type, bool allow_errors)
1293 {
1294         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
1295         struct ttm_bo_global *glob = bdev->glob;
1296         int ret;
1297
1298         /*
1299          * Can't use standard list traversal since we're unlocking.
1300          */
1301
1302         spin_lock(&glob->lru_lock);
1303         while (!list_empty(&man->lru)) {
1304                 spin_unlock(&glob->lru_lock);
1305                 ret = ttm_mem_evict_first(bdev, mem_type, false, false, false);
1306                 if (ret) {
1307                         if (allow_errors) {
1308                                 return ret;
1309                         } else {
1310                                 printk(KERN_ERR TTM_PFX
1311                                         "Cleanup eviction failed\n");
1312                         }
1313                 }
1314                 spin_lock(&glob->lru_lock);
1315         }
1316         spin_unlock(&glob->lru_lock);
1317         return 0;
1318 }
1319
1320 int ttm_bo_clean_mm(struct ttm_bo_device *bdev, unsigned mem_type)
1321 {
1322         struct ttm_mem_type_manager *man;
1323         int ret = -EINVAL;
1324
1325         if (mem_type >= TTM_NUM_MEM_TYPES) {
1326                 printk(KERN_ERR TTM_PFX "Illegal memory type %d\n", mem_type);
1327                 return ret;
1328         }
1329         man = &bdev->man[mem_type];
1330
1331         if (!man->has_type) {
1332                 printk(KERN_ERR TTM_PFX "Trying to take down uninitialized "
1333                        "memory manager type %u\n", mem_type);
1334                 return ret;
1335         }
1336
1337         man->use_type = false;
1338         man->has_type = false;
1339
1340         ret = 0;
1341         if (mem_type > 0) {
1342                 ttm_bo_force_list_clean(bdev, mem_type, false);
1343
1344                 ret = (*man->func->takedown)(man);
1345         }
1346
1347         return ret;
1348 }
1349 EXPORT_SYMBOL(ttm_bo_clean_mm);
1350
1351 int ttm_bo_evict_mm(struct ttm_bo_device *bdev, unsigned mem_type)
1352 {
1353         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
1354
1355         if (mem_type == 0 || mem_type >= TTM_NUM_MEM_TYPES) {
1356                 printk(KERN_ERR TTM_PFX
1357                        "Illegal memory manager memory type %u.\n",
1358                        mem_type);
1359                 return -EINVAL;
1360         }
1361
1362         if (!man->has_type) {
1363                 printk(KERN_ERR TTM_PFX
1364                        "Memory type %u has not been initialized.\n",
1365                        mem_type);
1366                 return 0;
1367         }
1368
1369         return ttm_bo_force_list_clean(bdev, mem_type, true);
1370 }
1371 EXPORT_SYMBOL(ttm_bo_evict_mm);
1372
1373 int ttm_bo_init_mm(struct ttm_bo_device *bdev, unsigned type,
1374                         unsigned long p_size)
1375 {
1376         int ret = -EINVAL;
1377         struct ttm_mem_type_manager *man;
1378
1379         BUG_ON(type >= TTM_NUM_MEM_TYPES);
1380         man = &bdev->man[type];
1381         BUG_ON(man->has_type);
1382         man->io_reserve_fastpath = true;
1383         man->use_io_reserve_lru = false;
1384         mutex_init(&man->io_reserve_mutex);
1385         INIT_LIST_HEAD(&man->io_reserve_lru);
1386
1387         ret = bdev->driver->init_mem_type(bdev, type, man);
1388         if (ret)
1389                 return ret;
1390         man->bdev = bdev;
1391
1392         ret = 0;
1393         if (type != TTM_PL_SYSTEM) {
1394                 ret = (*man->func->init)(man, p_size);
1395                 if (ret)
1396                         return ret;
1397         }
1398         man->has_type = true;
1399         man->use_type = true;
1400         man->size = p_size;
1401
1402         INIT_LIST_HEAD(&man->lru);
1403
1404         return 0;
1405 }
1406 EXPORT_SYMBOL(ttm_bo_init_mm);
1407
1408 static void ttm_bo_global_kobj_release(struct kobject *kobj)
1409 {
1410         struct ttm_bo_global *glob =
1411                 container_of(kobj, struct ttm_bo_global, kobj);
1412
1413         ttm_mem_unregister_shrink(glob->mem_glob, &glob->shrink);
1414         __free_page(glob->dummy_read_page);
1415         kfree(glob);
1416 }
1417
1418 void ttm_bo_global_release(struct drm_global_reference *ref)
1419 {
1420         struct ttm_bo_global *glob = ref->object;
1421
1422         kobject_del(&glob->kobj);
1423         kobject_put(&glob->kobj);
1424 }
1425 EXPORT_SYMBOL(ttm_bo_global_release);
1426
1427 int ttm_bo_global_init(struct drm_global_reference *ref)
1428 {
1429         struct ttm_bo_global_ref *bo_ref =
1430                 container_of(ref, struct ttm_bo_global_ref, ref);
1431         struct ttm_bo_global *glob = ref->object;
1432         int ret;
1433
1434         mutex_init(&glob->device_list_mutex);
1435         spin_lock_init(&glob->lru_lock);
1436         glob->mem_glob = bo_ref->mem_glob;
1437         glob->dummy_read_page = alloc_page(__GFP_ZERO | GFP_DMA32);
1438
1439         if (unlikely(glob->dummy_read_page == NULL)) {
1440                 ret = -ENOMEM;
1441                 goto out_no_drp;
1442         }
1443
1444         INIT_LIST_HEAD(&glob->swap_lru);
1445         INIT_LIST_HEAD(&glob->device_list);
1446
1447         ttm_mem_init_shrink(&glob->shrink, ttm_bo_swapout);
1448         ret = ttm_mem_register_shrink(glob->mem_glob, &glob->shrink);
1449         if (unlikely(ret != 0)) {
1450                 printk(KERN_ERR TTM_PFX
1451                        "Could not register buffer object swapout.\n");
1452                 goto out_no_shrink;
1453         }
1454
1455         glob->ttm_bo_extra_size =
1456                 ttm_round_pot(sizeof(struct ttm_tt)) +
1457                 ttm_round_pot(sizeof(struct ttm_backend));
1458
1459         glob->ttm_bo_size = glob->ttm_bo_extra_size +
1460                 ttm_round_pot(sizeof(struct ttm_buffer_object));
1461
1462         atomic_set(&glob->bo_count, 0);
1463
1464         ret = kobject_init_and_add(
1465                 &glob->kobj, &ttm_bo_glob_kobj_type, ttm_get_kobj(), "buffer_objects");
1466         if (unlikely(ret != 0))
1467                 kobject_put(&glob->kobj);
1468         return ret;
1469 out_no_shrink:
1470         __free_page(glob->dummy_read_page);
1471 out_no_drp:
1472         kfree(glob);
1473         return ret;
1474 }
1475 EXPORT_SYMBOL(ttm_bo_global_init);
1476
1477
1478 int ttm_bo_device_release(struct ttm_bo_device *bdev)
1479 {
1480         int ret = 0;
1481         unsigned i = TTM_NUM_MEM_TYPES;
1482         struct ttm_mem_type_manager *man;
1483         struct ttm_bo_global *glob = bdev->glob;
1484
1485         while (i--) {
1486                 man = &bdev->man[i];
1487                 if (man->has_type) {
1488                         man->use_type = false;
1489                         if ((i != TTM_PL_SYSTEM) && ttm_bo_clean_mm(bdev, i)) {
1490                                 ret = -EBUSY;
1491                                 printk(KERN_ERR TTM_PFX
1492                                        "DRM memory manager type %d "
1493                                        "is not clean.\n", i);
1494                         }
1495                         man->has_type = false;
1496                 }
1497         }
1498
1499         mutex_lock(&glob->device_list_mutex);
1500         list_del(&bdev->device_list);
1501         mutex_unlock(&glob->device_list_mutex);
1502
1503         cancel_delayed_work_sync(&bdev->wq);
1504
1505         while (ttm_bo_delayed_delete(bdev, true))
1506                 ;
1507
1508         spin_lock(&glob->lru_lock);
1509         if (list_empty(&bdev->ddestroy))
1510                 TTM_DEBUG("Delayed destroy list was clean\n");
1511
1512         if (list_empty(&bdev->man[0].lru))
1513                 TTM_DEBUG("Swap list was clean\n");
1514         spin_unlock(&glob->lru_lock);
1515
1516         BUG_ON(!drm_mm_clean(&bdev->addr_space_mm));
1517         write_lock(&bdev->vm_lock);
1518         drm_mm_takedown(&bdev->addr_space_mm);
1519         write_unlock(&bdev->vm_lock);
1520
1521         return ret;
1522 }
1523 EXPORT_SYMBOL(ttm_bo_device_release);
1524
1525 int ttm_bo_device_init(struct ttm_bo_device *bdev,
1526                        struct ttm_bo_global *glob,
1527                        struct ttm_bo_driver *driver,
1528                        uint64_t file_page_offset,
1529                        bool need_dma32)
1530 {
1531         int ret = -EINVAL;
1532
1533         rwlock_init(&bdev->vm_lock);
1534         bdev->driver = driver;
1535
1536         memset(bdev->man, 0, sizeof(bdev->man));
1537
1538         /*
1539          * Initialize the system memory buffer type.
1540          * Other types need to be driver / IOCTL initialized.
1541          */
1542         ret = ttm_bo_init_mm(bdev, TTM_PL_SYSTEM, 0);
1543         if (unlikely(ret != 0))
1544                 goto out_no_sys;
1545
1546         bdev->addr_space_rb = RB_ROOT;
1547         ret = drm_mm_init(&bdev->addr_space_mm, file_page_offset, 0x10000000);
1548         if (unlikely(ret != 0))
1549                 goto out_no_addr_mm;
1550
1551         INIT_DELAYED_WORK(&bdev->wq, ttm_bo_delayed_workqueue);
1552         bdev->nice_mode = true;
1553         INIT_LIST_HEAD(&bdev->ddestroy);
1554         bdev->dev_mapping = NULL;
1555         bdev->glob = glob;
1556         bdev->need_dma32 = need_dma32;
1557         bdev->val_seq = 0;
1558         spin_lock_init(&bdev->fence_lock);
1559         mutex_lock(&glob->device_list_mutex);
1560         list_add_tail(&bdev->device_list, &glob->device_list);
1561         mutex_unlock(&glob->device_list_mutex);
1562
1563         return 0;
1564 out_no_addr_mm:
1565         ttm_bo_clean_mm(bdev, 0);
1566 out_no_sys:
1567         return ret;
1568 }
1569 EXPORT_SYMBOL(ttm_bo_device_init);
1570
1571 /*
1572  * buffer object vm functions.
1573  */
1574
1575 bool ttm_mem_reg_is_pci(struct ttm_bo_device *bdev, struct ttm_mem_reg *mem)
1576 {
1577         struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
1578
1579         if (!(man->flags & TTM_MEMTYPE_FLAG_FIXED)) {
1580                 if (mem->mem_type == TTM_PL_SYSTEM)
1581                         return false;
1582
1583                 if (man->flags & TTM_MEMTYPE_FLAG_CMA)
1584                         return false;
1585
1586                 if (mem->placement & TTM_PL_FLAG_CACHED)
1587                         return false;
1588         }
1589         return true;
1590 }
1591
1592 void ttm_bo_unmap_virtual_locked(struct ttm_buffer_object *bo)
1593 {
1594         struct ttm_bo_device *bdev = bo->bdev;
1595         loff_t offset = (loff_t) bo->addr_space_offset;
1596         loff_t holelen = ((loff_t) bo->mem.num_pages) << PAGE_SHIFT;
1597
1598         if (!bdev->dev_mapping)
1599                 return;
1600         unmap_mapping_range(bdev->dev_mapping, offset, holelen, 1);
1601         ttm_mem_io_free_vm(bo);
1602 }
1603
1604 void ttm_bo_unmap_virtual(struct ttm_buffer_object *bo)
1605 {
1606         struct ttm_bo_device *bdev = bo->bdev;
1607         struct ttm_mem_type_manager *man = &bdev->man[bo->mem.mem_type];
1608
1609         ttm_mem_io_lock(man, false);
1610         ttm_bo_unmap_virtual_locked(bo);
1611         ttm_mem_io_unlock(man);
1612 }
1613
1614
1615 EXPORT_SYMBOL(ttm_bo_unmap_virtual);
1616
1617 static void ttm_bo_vm_insert_rb(struct ttm_buffer_object *bo)
1618 {
1619         struct ttm_bo_device *bdev = bo->bdev;
1620         struct rb_node **cur = &bdev->addr_space_rb.rb_node;
1621         struct rb_node *parent = NULL;
1622         struct ttm_buffer_object *cur_bo;
1623         unsigned long offset = bo->vm_node->start;
1624         unsigned long cur_offset;
1625
1626         while (*cur) {
1627                 parent = *cur;
1628                 cur_bo = rb_entry(parent, struct ttm_buffer_object, vm_rb);
1629                 cur_offset = cur_bo->vm_node->start;
1630                 if (offset < cur_offset)
1631                         cur = &parent->rb_left;
1632                 else if (offset > cur_offset)
1633                         cur = &parent->rb_right;
1634                 else
1635                         BUG();
1636         }
1637
1638         rb_link_node(&bo->vm_rb, parent, cur);
1639         rb_insert_color(&bo->vm_rb, &bdev->addr_space_rb);
1640 }
1641
1642 /**
1643  * ttm_bo_setup_vm:
1644  *
1645  * @bo: the buffer to allocate address space for
1646  *
1647  * Allocate address space in the drm device so that applications
1648  * can mmap the buffer and access the contents. This only
1649  * applies to ttm_bo_type_device objects as others are not
1650  * placed in the drm device address space.
1651  */
1652
1653 static int ttm_bo_setup_vm(struct ttm_buffer_object *bo)
1654 {
1655         struct ttm_bo_device *bdev = bo->bdev;
1656         int ret;
1657
1658 retry_pre_get:
1659         ret = drm_mm_pre_get(&bdev->addr_space_mm);
1660         if (unlikely(ret != 0))
1661                 return ret;
1662
1663         write_lock(&bdev->vm_lock);
1664         bo->vm_node = drm_mm_search_free(&bdev->addr_space_mm,
1665                                          bo->mem.num_pages, 0, 0);
1666
1667         if (unlikely(bo->vm_node == NULL)) {
1668                 ret = -ENOMEM;
1669                 goto out_unlock;
1670         }
1671
1672         bo->vm_node = drm_mm_get_block_atomic(bo->vm_node,
1673                                               bo->mem.num_pages, 0);
1674
1675         if (unlikely(bo->vm_node == NULL)) {
1676                 write_unlock(&bdev->vm_lock);
1677                 goto retry_pre_get;
1678         }
1679
1680         ttm_bo_vm_insert_rb(bo);
1681         write_unlock(&bdev->vm_lock);
1682         bo->addr_space_offset = ((uint64_t) bo->vm_node->start) << PAGE_SHIFT;
1683
1684         return 0;
1685 out_unlock:
1686         write_unlock(&bdev->vm_lock);
1687         return ret;
1688 }
1689
1690 int ttm_bo_wait(struct ttm_buffer_object *bo,
1691                 bool lazy, bool interruptible, bool no_wait)
1692 {
1693         struct ttm_bo_driver *driver = bo->bdev->driver;
1694         struct ttm_bo_device *bdev = bo->bdev;
1695         void *sync_obj;
1696         void *sync_obj_arg;
1697         int ret = 0;
1698
1699         if (likely(bo->sync_obj == NULL))
1700                 return 0;
1701
1702         while (bo->sync_obj) {
1703
1704                 if (driver->sync_obj_signaled(bo->sync_obj, bo->sync_obj_arg)) {
1705                         void *tmp_obj = bo->sync_obj;
1706                         bo->sync_obj = NULL;
1707                         clear_bit(TTM_BO_PRIV_FLAG_MOVING, &bo->priv_flags);
1708                         spin_unlock(&bdev->fence_lock);
1709                         driver->sync_obj_unref(&tmp_obj);
1710                         spin_lock(&bdev->fence_lock);
1711                         continue;
1712                 }
1713
1714                 if (no_wait)
1715                         return -EBUSY;
1716
1717                 sync_obj = driver->sync_obj_ref(bo->sync_obj);
1718                 sync_obj_arg = bo->sync_obj_arg;
1719                 spin_unlock(&bdev->fence_lock);
1720                 ret = driver->sync_obj_wait(sync_obj, sync_obj_arg,
1721                                             lazy, interruptible);
1722                 if (unlikely(ret != 0)) {
1723                         driver->sync_obj_unref(&sync_obj);
1724                         spin_lock(&bdev->fence_lock);
1725                         return ret;
1726                 }
1727                 spin_lock(&bdev->fence_lock);
1728                 if (likely(bo->sync_obj == sync_obj &&
1729                            bo->sync_obj_arg == sync_obj_arg)) {
1730                         void *tmp_obj = bo->sync_obj;
1731                         bo->sync_obj = NULL;
1732                         clear_bit(TTM_BO_PRIV_FLAG_MOVING,
1733                                   &bo->priv_flags);
1734                         spin_unlock(&bdev->fence_lock);
1735                         driver->sync_obj_unref(&sync_obj);
1736                         driver->sync_obj_unref(&tmp_obj);
1737                         spin_lock(&bdev->fence_lock);
1738                 } else {
1739                         spin_unlock(&bdev->fence_lock);
1740                         driver->sync_obj_unref(&sync_obj);
1741                         spin_lock(&bdev->fence_lock);
1742                 }
1743         }
1744         return 0;
1745 }
1746 EXPORT_SYMBOL(ttm_bo_wait);
1747
1748 int ttm_bo_synccpu_write_grab(struct ttm_buffer_object *bo, bool no_wait)
1749 {
1750         struct ttm_bo_device *bdev = bo->bdev;
1751         int ret = 0;
1752
1753         /*
1754          * Using ttm_bo_reserve makes sure the lru lists are updated.
1755          */
1756
1757         ret = ttm_bo_reserve(bo, true, no_wait, false, 0);
1758         if (unlikely(ret != 0))
1759                 return ret;
1760         spin_lock(&bdev->fence_lock);
1761         ret = ttm_bo_wait(bo, false, true, no_wait);
1762         spin_unlock(&bdev->fence_lock);
1763         if (likely(ret == 0))
1764                 atomic_inc(&bo->cpu_writers);
1765         ttm_bo_unreserve(bo);
1766         return ret;
1767 }
1768 EXPORT_SYMBOL(ttm_bo_synccpu_write_grab);
1769
1770 void ttm_bo_synccpu_write_release(struct ttm_buffer_object *bo)
1771 {
1772         if (atomic_dec_and_test(&bo->cpu_writers))
1773                 wake_up_all(&bo->event_queue);
1774 }
1775 EXPORT_SYMBOL(ttm_bo_synccpu_write_release);
1776
1777 /**
1778  * A buffer object shrink method that tries to swap out the first
1779  * buffer object on the bo_global::swap_lru list.
1780  */
1781
1782 static int ttm_bo_swapout(struct ttm_mem_shrink *shrink)
1783 {
1784         struct ttm_bo_global *glob =
1785             container_of(shrink, struct ttm_bo_global, shrink);
1786         struct ttm_buffer_object *bo;
1787         int ret = -EBUSY;
1788         int put_count;
1789         uint32_t swap_placement = (TTM_PL_FLAG_CACHED | TTM_PL_FLAG_SYSTEM);
1790
1791         spin_lock(&glob->lru_lock);
1792         while (ret == -EBUSY) {
1793                 if (unlikely(list_empty(&glob->swap_lru))) {
1794                         spin_unlock(&glob->lru_lock);
1795                         return -EBUSY;
1796                 }
1797
1798                 bo = list_first_entry(&glob->swap_lru,
1799                                       struct ttm_buffer_object, swap);
1800                 kref_get(&bo->list_kref);
1801
1802                 if (!list_empty(&bo->ddestroy)) {
1803                         spin_unlock(&glob->lru_lock);
1804                         (void) ttm_bo_cleanup_refs(bo, false, false, false);
1805                         kref_put(&bo->list_kref, ttm_bo_release_list);
1806                         continue;
1807                 }
1808
1809                 /**
1810                  * Reserve buffer. Since we unlock while sleeping, we need
1811                  * to re-check that nobody removed us from the swap-list while
1812                  * we slept.
1813                  */
1814
1815                 ret = ttm_bo_reserve_locked(bo, false, true, false, 0);
1816                 if (unlikely(ret == -EBUSY)) {
1817                         spin_unlock(&glob->lru_lock);
1818                         ttm_bo_wait_unreserved(bo, false);
1819                         kref_put(&bo->list_kref, ttm_bo_release_list);
1820                         spin_lock(&glob->lru_lock);
1821                 }
1822         }
1823
1824         BUG_ON(ret != 0);
1825         put_count = ttm_bo_del_from_lru(bo);
1826         spin_unlock(&glob->lru_lock);
1827
1828         ttm_bo_list_ref_sub(bo, put_count, true);
1829
1830         /**
1831          * Wait for GPU, then move to system cached.
1832          */
1833
1834         spin_lock(&bo->bdev->fence_lock);
1835         ret = ttm_bo_wait(bo, false, false, false);
1836         spin_unlock(&bo->bdev->fence_lock);
1837
1838         if (unlikely(ret != 0))
1839                 goto out;
1840
1841         if ((bo->mem.placement & swap_placement) != swap_placement) {
1842                 struct ttm_mem_reg evict_mem;
1843
1844                 evict_mem = bo->mem;
1845                 evict_mem.mm_node = NULL;
1846                 evict_mem.placement = TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED;
1847                 evict_mem.mem_type = TTM_PL_SYSTEM;
1848
1849                 ret = ttm_bo_handle_move_mem(bo, &evict_mem, true,
1850                                              false, false, false);
1851                 if (unlikely(ret != 0))
1852                         goto out;
1853         }
1854
1855         ttm_bo_unmap_virtual(bo);
1856
1857         /**
1858          * Swap out. Buffer will be swapped in again as soon as
1859          * anyone tries to access a ttm page.
1860          */
1861
1862         if (bo->bdev->driver->swap_notify)
1863                 bo->bdev->driver->swap_notify(bo);
1864
1865         ret = ttm_tt_swapout(bo->ttm, bo->persistant_swap_storage);
1866 out:
1867
1868         /**
1869          *
1870          * Unreserve without putting on LRU to avoid swapping out an
1871          * already swapped buffer.
1872          */
1873
1874         atomic_set(&bo->reserved, 0);
1875         wake_up_all(&bo->event_queue);
1876         kref_put(&bo->list_kref, ttm_bo_release_list);
1877         return ret;
1878 }
1879
1880 void ttm_bo_swapout_all(struct ttm_bo_device *bdev)
1881 {
1882         while (ttm_bo_swapout(&bdev->glob->shrink) == 0)
1883                 ;
1884 }
1885 EXPORT_SYMBOL(ttm_bo_swapout_all);