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