drm/ttm: Use Linux kobjects
[dragonfly.git] / sys / dev / 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 #define pr_fmt(fmt) "[TTM] " fmt
32
33 #include <drm/ttm/ttm_module.h>
34 #include <drm/ttm/ttm_bo_driver.h>
35 #include <drm/ttm/ttm_placement.h>
36 #include <linux/jiffies.h>
37 #include <linux/slab.h>
38 #include <linux/sched.h>
39 #include <linux/mm.h>
40 #include <linux/file.h>
41 #include <linux/module.h>
42 #include <linux/atomic.h>
43
44 #define TTM_ASSERT_LOCKED(param)        do { } while (0)
45 #define TTM_DEBUG(fmt, arg...)          do { } while (0)
46 #define TTM_BO_HASH_ORDER 13
47
48 static int ttm_bo_setup_vm(struct ttm_buffer_object *bo);
49 static int ttm_bo_swapout(struct ttm_mem_shrink *shrink);
50 static void ttm_bo_global_kobj_release(struct kobject *kobj);
51
52 static struct attribute ttm_bo_count = {
53         .name = "bo_count",
54         .mode = S_IRUGO
55 };
56
57 static inline int ttm_mem_type_from_place(const struct ttm_place *place,
58                                           uint32_t *mem_type)
59 {
60         int i;
61
62         for (i = 0; i <= TTM_PL_PRIV5; i++)
63                 if (place->flags & (1 << i)) {
64                         *mem_type = i;
65                         return 0;
66                 }
67         return -EINVAL;
68 }
69
70 static void ttm_mem_type_debug(struct ttm_bo_device *bdev, int mem_type)
71 {
72         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
73
74         pr_err("    has_type: %d\n", man->has_type);
75         pr_err("    use_type: %d\n", man->use_type);
76         pr_err("    flags: 0x%08X\n", man->flags);
77         pr_err("    gpu_offset: 0x%08lX\n", man->gpu_offset);
78         pr_err("    size: %ju\n", (uintmax_t)man->size);
79         pr_err("    available_caching: 0x%08X\n", man->available_caching);
80         pr_err("    default_caching: 0x%08X\n", man->default_caching);
81         if (mem_type != TTM_PL_SYSTEM)
82                 (*man->func->debug)(man, TTM_PFX);
83 }
84
85 static void ttm_bo_mem_space_debug(struct ttm_buffer_object *bo,
86                                         struct ttm_placement *placement)
87 {
88         int i, ret, mem_type;
89
90         pr_err("No space for %p (%lu pages, %luK, %luM)\n",
91                bo, bo->mem.num_pages, bo->mem.size >> 10,
92                bo->mem.size >> 20);
93         for (i = 0; i < placement->num_placement; i++) {
94                 ret = ttm_mem_type_from_place(&placement->placement[i],
95                                                 &mem_type);
96                 if (ret)
97                         return;
98                 pr_err("  placement[%d]=0x%08X (%d)\n",
99                        i, placement->placement[i].flags, mem_type);
100                 ttm_mem_type_debug(bo->bdev, mem_type);
101         }
102 }
103
104 static ssize_t ttm_bo_global_show(struct kobject *kobj,
105                                   struct attribute *attr,
106                                   char *buffer)
107 {
108         struct ttm_bo_global *glob =
109                 container_of(kobj, struct ttm_bo_global, kobj);
110
111         return ksnprintf(buffer, PAGE_SIZE, "%lu\n",
112                         (unsigned long) atomic_read(&glob->bo_count));
113 }
114
115 static struct attribute *ttm_bo_global_attrs[] = {
116         &ttm_bo_count,
117         NULL
118 };
119
120 static const struct sysfs_ops ttm_bo_global_ops = {
121         .show = &ttm_bo_global_show
122 };
123
124 static struct kobj_type ttm_bo_glob_kobj_type  = {
125         .release = &ttm_bo_global_kobj_release,
126         .sysfs_ops = &ttm_bo_global_ops,
127         .default_attrs = ttm_bo_global_attrs
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         size_t acc_size = bo->acc_size;
141
142         BUG_ON(atomic_read(&bo->list_kref.refcount));
143         BUG_ON(atomic_read(&bo->kref.refcount));
144         BUG_ON(atomic_read(&bo->cpu_writers));
145         BUG_ON(bo->sync_obj != NULL);
146         BUG_ON(bo->mem.mm_node != NULL);
147         BUG_ON(!list_empty(&bo->lru));
148         BUG_ON(!list_empty(&bo->ddestroy));
149
150         if (bo->ttm)
151                 ttm_tt_destroy(bo->ttm);
152         atomic_dec(&bo->glob->bo_count);
153         if (bo->destroy)
154                 bo->destroy(bo);
155         else {
156                 kfree(bo);
157         }
158         ttm_mem_global_free(bdev->glob->mem_glob, acc_size);
159 }
160
161 static int ttm_bo_wait_unreserved(struct ttm_buffer_object *bo,
162                                   bool interruptible)
163 {
164         if (interruptible) {
165                 return wait_event_interruptible(bo->event_queue,
166                                                !ttm_bo_is_reserved(bo));
167         } else {
168                 wait_event(bo->event_queue, !ttm_bo_is_reserved(bo));
169                 return 0;
170         }
171 }
172
173 void ttm_bo_add_to_lru(struct ttm_buffer_object *bo)
174 {
175         struct ttm_bo_device *bdev = bo->bdev;
176         struct ttm_mem_type_manager *man;
177
178         BUG_ON(!ttm_bo_is_reserved(bo));
179
180         if (!(bo->mem.placement & TTM_PL_FLAG_NO_EVICT)) {
181
182                 BUG_ON(!list_empty(&bo->lru));
183
184                 man = &bdev->man[bo->mem.mem_type];
185                 list_add_tail(&bo->lru, &man->lru);
186                 kref_get(&bo->list_kref);
187
188                 if (bo->ttm != NULL) {
189                         list_add_tail(&bo->swap, &bo->glob->swap_lru);
190                         kref_get(&bo->list_kref);
191                 }
192         }
193 }
194
195 int ttm_bo_del_from_lru(struct ttm_buffer_object *bo)
196 {
197         int put_count = 0;
198
199         if (!list_empty(&bo->swap)) {
200                 list_del_init(&bo->swap);
201                 ++put_count;
202         }
203         if (!list_empty(&bo->lru)) {
204                 list_del_init(&bo->lru);
205                 ++put_count;
206         }
207
208         /*
209          * TODO: Add a driver hook to delete from
210          * driver-specific LRU's here.
211          */
212
213         return put_count;
214 }
215
216 int ttm_bo_reserve_nolru(struct ttm_buffer_object *bo,
217                           bool interruptible,
218                           bool no_wait, bool use_ticket,
219                           struct ww_acquire_ctx *ticket)
220 {
221         int ret;
222
223         while (unlikely(atomic_xchg(&bo->reserved, 1) != 0)) {
224                 /**
225                  * Deadlock avoidance for multi-bo reserving.
226                  */
227                 if (use_ticket && bo->seq_valid) {
228                         /**
229                          * We've already reserved this one.
230                          */
231                         if (unlikely(ticket->stamp == bo->val_seq))
232                                 return -EDEADLK;
233                         /**
234                          * Already reserved by a thread that will not back
235                          * off for us. We need to back off.
236                          */
237                         if (unlikely(ticket->stamp - bo->val_seq <= LONG_MAX))
238                                 return -EAGAIN;
239                 }
240
241                 if (no_wait)
242                         return -EBUSY;
243
244                 ret = ttm_bo_wait_unreserved(bo, interruptible);
245
246                 if (unlikely(ret))
247                         return ret;
248         }
249
250         if (use_ticket) {
251                 bool wake_up = false;
252
253                 /**
254                  * Wake up waiters that may need to recheck for deadlock,
255                  * if we decreased the sequence number.
256                  */
257                 if (unlikely((bo->val_seq - ticket->stamp <= LONG_MAX)
258                              || !bo->seq_valid))
259                         wake_up = true;
260
261                 /*
262                  * In the worst case with memory ordering these values can be
263                  * seen in the wrong order. However since we call wake_up_all
264                  * in that case, this will hopefully not pose a problem,
265                  * and the worst case would only cause someone to accidentally
266                  * hit -EAGAIN in ttm_bo_reserve when they see old value of
267                  * val_seq. However this would only happen if seq_valid was
268                  * written before val_seq was, and just means some slightly
269                  * increased cpu usage
270                  */
271                 bo->val_seq = ticket->stamp;
272                 bo->seq_valid = true;
273                 if (wake_up)
274                         wake_up_all(&bo->event_queue);
275         } else {
276                 bo->seq_valid = false;
277         }
278
279         return 0;
280 }
281 EXPORT_SYMBOL(ttm_bo_reserve);
282
283 static void ttm_bo_ref_bug(struct kref *list_kref)
284 {
285         BUG();
286 }
287
288 void ttm_bo_list_ref_sub(struct ttm_buffer_object *bo, int count,
289                          bool never_free)
290 {
291         kref_sub(&bo->list_kref, count,
292                  (never_free) ? ttm_bo_ref_bug : ttm_bo_release_list);
293 }
294
295 int ttm_bo_reserve(struct ttm_buffer_object *bo,
296                    bool interruptible,
297                    bool no_wait, bool use_ticket,
298                    struct ww_acquire_ctx *ticket)
299 {
300         struct ttm_bo_global *glob = bo->glob;
301         int put_count = 0;
302         int ret;
303
304         ret = ttm_bo_reserve_nolru(bo, interruptible, no_wait, use_ticket,
305                                     ticket);
306         if (likely(ret == 0)) {
307                 lockmgr(&glob->lru_lock, LK_EXCLUSIVE);
308                 put_count = ttm_bo_del_from_lru(bo);
309                 lockmgr(&glob->lru_lock, LK_RELEASE);
310                 ttm_bo_list_ref_sub(bo, put_count, true);
311         }
312
313         return ret;
314 }
315
316 int ttm_bo_reserve_slowpath_nolru(struct ttm_buffer_object *bo,
317                                   bool interruptible,
318                                   struct ww_acquire_ctx *ticket)
319 {
320         bool wake_up = false;
321         int ret;
322
323         while (unlikely(atomic_xchg(&bo->reserved, 1) != 0)) {
324                 WARN_ON(bo->seq_valid && ticket->stamp == bo->val_seq);
325
326                 ret = ttm_bo_wait_unreserved(bo, interruptible);
327
328                 if (unlikely(ret))
329                         return ret;
330         }
331
332         if (bo->val_seq - ticket->stamp < LONG_MAX || !bo->seq_valid)
333                 wake_up = true;
334
335         /**
336          * Wake up waiters that may need to recheck for deadlock,
337          * if we decreased the sequence number.
338          */
339         bo->val_seq = ticket->stamp;
340         bo->seq_valid = true;
341         if (wake_up)
342                 wake_up_all(&bo->event_queue);
343
344         return 0;
345 }
346
347 int ttm_bo_reserve_slowpath(struct ttm_buffer_object *bo,
348                             bool interruptible, struct ww_acquire_ctx *ticket)
349 {
350         struct ttm_bo_global *glob = bo->glob;
351         int put_count, ret;
352
353         ret = ttm_bo_reserve_slowpath_nolru(bo, interruptible, ticket);
354         if (likely(!ret)) {
355                 lockmgr(&glob->lru_lock, LK_EXCLUSIVE);
356                 put_count = ttm_bo_del_from_lru(bo);
357                 lockmgr(&glob->lru_lock, LK_RELEASE);
358                 ttm_bo_list_ref_sub(bo, put_count, true);
359         }
360         return ret;
361 }
362 EXPORT_SYMBOL(ttm_bo_reserve_slowpath);
363
364 /*
365  * Must interlock with event_queue to avoid race against
366  * wait_event_common() which can cause wait_event_common()
367  * to become stuck.
368  */
369 static void
370 ttm_bo_unreserve_core(struct ttm_buffer_object *bo)
371 {
372         lockmgr(&bo->event_queue.lock, LK_EXCLUSIVE);
373         atomic_set(&bo->reserved, 0);
374         lockmgr(&bo->event_queue.lock, LK_RELEASE);
375         wake_up_all(&bo->event_queue);
376 }
377
378 void ttm_bo_unreserve_ticket_locked(struct ttm_buffer_object *bo, struct ww_acquire_ctx *ticket)
379 {
380         ttm_bo_add_to_lru(bo);
381         ttm_bo_unreserve_core(bo);
382 }
383
384 void ttm_bo_unreserve(struct ttm_buffer_object *bo)
385 {
386         struct ttm_bo_global *glob = bo->glob;
387
388         lockmgr(&glob->lru_lock, LK_EXCLUSIVE);
389         ttm_bo_unreserve_ticket_locked(bo, NULL);
390         lockmgr(&glob->lru_lock, LK_RELEASE);
391 }
392 EXPORT_SYMBOL(ttm_bo_unreserve);
393
394 void ttm_bo_unreserve_ticket(struct ttm_buffer_object *bo, struct ww_acquire_ctx *ticket)
395 {
396         struct ttm_bo_global *glob = bo->glob;
397
398         lockmgr(&glob->lru_lock, LK_EXCLUSIVE);
399         ttm_bo_unreserve_ticket_locked(bo, ticket);
400         lockmgr(&glob->lru_lock, LK_RELEASE);
401 }
402 EXPORT_SYMBOL(ttm_bo_unreserve_ticket);
403
404 /*
405  * Call bo->mutex locked.
406  */
407 static int ttm_bo_add_ttm(struct ttm_buffer_object *bo, bool zero_alloc)
408 {
409         struct ttm_bo_device *bdev = bo->bdev;
410         struct ttm_bo_global *glob = bo->glob;
411         int ret = 0;
412         uint32_t page_flags = 0;
413
414         TTM_ASSERT_LOCKED(&bo->mutex);
415         bo->ttm = NULL;
416
417         if (bdev->need_dma32)
418                 page_flags |= TTM_PAGE_FLAG_DMA32;
419
420         switch (bo->type) {
421         case ttm_bo_type_device:
422                 if (zero_alloc)
423                         page_flags |= TTM_PAGE_FLAG_ZERO_ALLOC;
424         case ttm_bo_type_kernel:
425                 bo->ttm = bdev->driver->ttm_tt_create(bdev, bo->num_pages << PAGE_SHIFT,
426                                                       page_flags, glob->dummy_read_page);
427                 if (unlikely(bo->ttm == NULL))
428                         ret = -ENOMEM;
429                 break;
430         case ttm_bo_type_sg:
431                 bo->ttm = bdev->driver->ttm_tt_create(bdev, bo->num_pages << PAGE_SHIFT,
432                                                       page_flags | TTM_PAGE_FLAG_SG,
433                                                       glob->dummy_read_page);
434                 if (unlikely(bo->ttm == NULL)) {
435                         ret = -ENOMEM;
436                         break;
437                 }
438                 bo->ttm->sg = bo->sg;
439                 break;
440         default:
441                 pr_err("Illegal buffer object type\n");
442                 ret = -EINVAL;
443                 break;
444         }
445
446         return ret;
447 }
448
449 static int ttm_bo_handle_move_mem(struct ttm_buffer_object *bo,
450                                   struct ttm_mem_reg *mem,
451                                   bool evict, bool interruptible,
452                                   bool no_wait_gpu)
453 {
454         struct ttm_bo_device *bdev = bo->bdev;
455         bool old_is_pci = ttm_mem_reg_is_pci(bdev, &bo->mem);
456         bool new_is_pci = ttm_mem_reg_is_pci(bdev, mem);
457         struct ttm_mem_type_manager *old_man = &bdev->man[bo->mem.mem_type];
458         struct ttm_mem_type_manager *new_man = &bdev->man[mem->mem_type];
459         int ret = 0;
460
461         if (old_is_pci || new_is_pci ||
462             ((mem->placement & bo->mem.placement & TTM_PL_MASK_CACHING) == 0)) {
463                 ret = ttm_mem_io_lock(old_man, true);
464                 if (unlikely(ret != 0))
465                         goto out_err;
466                 ttm_bo_unmap_virtual_locked(bo);
467                 ttm_mem_io_unlock(old_man);
468         }
469
470         /*
471          * Create and bind a ttm if required.
472          */
473
474         if (!(new_man->flags & TTM_MEMTYPE_FLAG_FIXED)) {
475                 if (bo->ttm == NULL) {
476                         bool zero = !(old_man->flags & TTM_MEMTYPE_FLAG_FIXED);
477                         ret = ttm_bo_add_ttm(bo, zero);
478                         if (ret)
479                                 goto out_err;
480                 }
481
482                 ret = ttm_tt_set_placement_caching(bo->ttm, mem->placement);
483                 if (ret)
484                         goto out_err;
485
486                 if (mem->mem_type != TTM_PL_SYSTEM) {
487                         ret = ttm_tt_bind(bo->ttm, mem);
488                         if (ret)
489                                 goto out_err;
490                 }
491
492                 if (bo->mem.mem_type == TTM_PL_SYSTEM) {
493                         if (bdev->driver->move_notify)
494                                 bdev->driver->move_notify(bo, mem);
495                         bo->mem = *mem;
496                         mem->mm_node = NULL;
497                         goto moved;
498                 }
499         }
500
501         if (bdev->driver->move_notify)
502                 bdev->driver->move_notify(bo, mem);
503
504         if (!(old_man->flags & TTM_MEMTYPE_FLAG_FIXED) &&
505             !(new_man->flags & TTM_MEMTYPE_FLAG_FIXED))
506                 ret = ttm_bo_move_ttm(bo, evict, no_wait_gpu, mem);
507         else if (bdev->driver->move)
508                 ret = bdev->driver->move(bo, evict, interruptible,
509                                          no_wait_gpu, mem);
510         else
511                 ret = ttm_bo_move_memcpy(bo, evict, no_wait_gpu, mem);
512
513         if (ret) {
514                 if (bdev->driver->move_notify) {
515                         struct ttm_mem_reg tmp_mem = *mem;
516                         *mem = bo->mem;
517                         bo->mem = tmp_mem;
518                         bdev->driver->move_notify(bo, mem);
519                         bo->mem = *mem;
520                         *mem = tmp_mem;
521                 }
522
523                 goto out_err;
524         }
525
526 moved:
527         if (bo->evicted) {
528                 ret = bdev->driver->invalidate_caches(bdev, bo->mem.placement);
529                 if (ret)
530                         pr_err("Can not flush read caches\n");
531                 bo->evicted = false;
532         }
533
534         if (bo->mem.mm_node) {
535                 bo->offset = (bo->mem.start << PAGE_SHIFT) +
536                     bdev->man[bo->mem.mem_type].gpu_offset;
537                 bo->cur_placement = bo->mem.placement;
538         } else
539                 bo->offset = 0;
540
541         return 0;
542
543 out_err:
544         new_man = &bdev->man[bo->mem.mem_type];
545         if ((new_man->flags & TTM_MEMTYPE_FLAG_FIXED) && bo->ttm) {
546                 ttm_tt_unbind(bo->ttm);
547                 ttm_tt_destroy(bo->ttm);
548                 bo->ttm = NULL;
549         }
550
551         return ret;
552 }
553
554 /**
555  * Call bo::reserved.
556  * Will release GPU memory type usage on destruction.
557  * This is the place to put in driver specific hooks to release
558  * driver private resources.
559  * Will release the bo::reserved lock.
560  */
561
562 static void ttm_bo_cleanup_memtype_use(struct ttm_buffer_object *bo)
563 {
564         if (bo->bdev->driver->move_notify)
565                 bo->bdev->driver->move_notify(bo, NULL);
566
567         if (bo->ttm) {
568                 ttm_tt_unbind(bo->ttm);
569                 ttm_tt_destroy(bo->ttm);
570                 bo->ttm = NULL;
571         }
572         ttm_bo_mem_put(bo, &bo->mem);
573         ttm_bo_unreserve_core(bo);
574
575         /*
576          * Since the final reference to this bo may not be dropped by
577          * the current task we have to put a memory barrier here to make
578          * sure the changes done in this function are always visible.
579          *
580          * This function only needs protection against the final kref_put.
581          */
582         cpu_mfence();
583 }
584
585 static void ttm_bo_cleanup_refs_or_queue(struct ttm_buffer_object *bo)
586 {
587         struct ttm_bo_device *bdev = bo->bdev;
588         struct ttm_bo_global *glob = bo->glob;
589         struct ttm_bo_driver *driver = bdev->driver;
590         void *sync_obj = NULL;
591         int put_count;
592         int ret;
593
594         lockmgr(&glob->lru_lock, LK_EXCLUSIVE);
595         ret = ttm_bo_reserve_nolru(bo, false, true, false, 0);
596
597         lockmgr(&bdev->fence_lock, LK_EXCLUSIVE);
598         (void) ttm_bo_wait(bo, false, false, true);
599         if (!ret && !bo->sync_obj) {
600                 lockmgr(&bdev->fence_lock, LK_RELEASE);
601                 put_count = ttm_bo_del_from_lru(bo);
602
603                 lockmgr(&glob->lru_lock, LK_RELEASE);
604                 ttm_bo_cleanup_memtype_use(bo);
605
606                 ttm_bo_list_ref_sub(bo, put_count, true);
607
608                 return;
609         }
610         if (bo->sync_obj)
611                 sync_obj = driver->sync_obj_ref(bo->sync_obj);
612         lockmgr(&bdev->fence_lock, LK_RELEASE);
613
614         if (!ret) {
615
616                 /*
617                  * Make NO_EVICT bos immediately available to
618                  * shrinkers, now that they are queued for
619                  * destruction.
620                  */
621                 if (bo->mem.placement & TTM_PL_FLAG_NO_EVICT) {
622                         bo->mem.placement &= ~TTM_PL_FLAG_NO_EVICT;
623                         ttm_bo_add_to_lru(bo);
624                 }
625
626                 ttm_bo_unreserve_core(bo);
627         }
628
629         kref_get(&bo->list_kref);
630         list_add_tail(&bo->ddestroy, &bdev->ddestroy);
631         lockmgr(&glob->lru_lock, LK_RELEASE);
632
633         if (sync_obj) {
634                 driver->sync_obj_flush(sync_obj);
635                 driver->sync_obj_unref(&sync_obj);
636         }
637         schedule_delayed_work(&bdev->wq,
638                               ((hz / 100) < 1) ? 1 : hz / 100);
639 }
640
641 /**
642  * function ttm_bo_cleanup_refs_and_unlock
643  * If bo idle, remove from delayed- and lru lists, and unref.
644  * If not idle, do nothing.
645  *
646  * Must be called with lru_lock and reservation held, this function
647  * will drop both before returning.
648  *
649  * @interruptible         Any sleeps should occur interruptibly.
650  * @no_wait_gpu           Never wait for gpu. Return -EBUSY instead.
651  */
652
653 static int ttm_bo_cleanup_refs_and_unlock(struct ttm_buffer_object *bo,
654                                           bool interruptible,
655                                           bool no_wait_gpu)
656 {
657         struct ttm_bo_device *bdev = bo->bdev;
658         struct ttm_bo_driver *driver = bdev->driver;
659         struct ttm_bo_global *glob = bo->glob;
660         int put_count;
661         int ret;
662
663         lockmgr(&bdev->fence_lock, LK_EXCLUSIVE);
664         ret = ttm_bo_wait(bo, false, false, true);
665
666         if (ret && !no_wait_gpu) {
667                 void *sync_obj;
668
669                 /*
670                  * Take a reference to the fence and unreserve,
671                  * at this point the buffer should be dead, so
672                  * no new sync objects can be attached.
673                  */
674                 sync_obj = driver->sync_obj_ref(bo->sync_obj);
675                 lockmgr(&bdev->fence_lock, LK_RELEASE);
676
677                 ttm_bo_unreserve_core(bo);
678                 lockmgr(&glob->lru_lock, LK_RELEASE);
679
680                 ret = driver->sync_obj_wait(sync_obj, false, interruptible);
681                 driver->sync_obj_unref(&sync_obj);
682                 if (ret)
683                         return ret;
684
685                 /*
686                  * remove sync_obj with ttm_bo_wait, the wait should be
687                  * finished, and no new wait object should have been added.
688                  */
689                 lockmgr(&bdev->fence_lock, LK_EXCLUSIVE);
690                 ret = ttm_bo_wait(bo, false, false, true);
691                 WARN_ON(ret);
692                 lockmgr(&bdev->fence_lock, LK_RELEASE);
693                 if (ret)
694                         return ret;
695
696                 lockmgr(&glob->lru_lock, LK_EXCLUSIVE);
697                 ret = ttm_bo_reserve_nolru(bo, false, true, false, 0);
698
699                 /*
700                  * We raced, and lost, someone else holds the reservation now,
701                  * and is probably busy in ttm_bo_cleanup_memtype_use.
702                  *
703                  * Even if it's not the case, because we finished waiting any
704                  * delayed destruction would succeed, so just return success
705                  * here.
706                  */
707                 if (ret) {
708                         lockmgr(&glob->lru_lock, LK_RELEASE);
709                         return 0;
710                 }
711         } else
712                 lockmgr(&bdev->fence_lock, LK_RELEASE);
713
714         if (ret || unlikely(list_empty(&bo->ddestroy))) {
715                 ttm_bo_unreserve_core(bo);
716                 lockmgr(&glob->lru_lock, LK_RELEASE);
717                 return ret;
718         }
719
720         put_count = ttm_bo_del_from_lru(bo);
721         list_del_init(&bo->ddestroy);
722         ++put_count;
723
724         lockmgr(&glob->lru_lock, LK_RELEASE);
725         ttm_bo_cleanup_memtype_use(bo);
726
727         ttm_bo_list_ref_sub(bo, put_count, true);
728
729         return 0;
730 }
731
732 /**
733  * Traverse the delayed list, and call ttm_bo_cleanup_refs on all
734  * encountered buffers.
735  */
736
737 static int ttm_bo_delayed_delete(struct ttm_bo_device *bdev, bool remove_all)
738 {
739         struct ttm_bo_global *glob = bdev->glob;
740         struct ttm_buffer_object *entry = NULL;
741         int ret = 0;
742
743         lockmgr(&glob->lru_lock, LK_EXCLUSIVE);
744         if (list_empty(&bdev->ddestroy))
745                 goto out_unlock;
746
747         entry = list_first_entry(&bdev->ddestroy,
748                 struct ttm_buffer_object, ddestroy);
749         kref_get(&entry->list_kref);
750
751         for (;;) {
752                 struct ttm_buffer_object *nentry = NULL;
753
754                 if (entry->ddestroy.next != &bdev->ddestroy) {
755                         nentry = list_first_entry(&entry->ddestroy,
756                                 struct ttm_buffer_object, ddestroy);
757                         kref_get(&nentry->list_kref);
758                 }
759
760                 ret = ttm_bo_reserve_nolru(entry, false, true, false, 0);
761                 if (remove_all && ret) {
762                         lockmgr(&glob->lru_lock, LK_RELEASE);
763                         ret = ttm_bo_reserve_nolru(entry, false, false,
764                                                    false, 0);
765                         lockmgr(&glob->lru_lock, LK_EXCLUSIVE);
766                 }
767
768                 if (!ret)
769                         ret = ttm_bo_cleanup_refs_and_unlock(entry, false,
770                                                              !remove_all);
771                 else
772                         lockmgr(&glob->lru_lock, LK_RELEASE);
773
774                 kref_put(&entry->list_kref, ttm_bo_release_list);
775                 entry = nentry;
776
777                 if (ret || !entry)
778                         goto out;
779
780                 lockmgr(&glob->lru_lock, LK_EXCLUSIVE);
781                 if (list_empty(&entry->ddestroy))
782                         break;
783         }
784
785 out_unlock:
786         lockmgr(&glob->lru_lock, LK_RELEASE);
787 out:
788         if (entry)
789                 kref_put(&entry->list_kref, ttm_bo_release_list);
790         return ret;
791 }
792
793 static void ttm_bo_delayed_workqueue(struct work_struct *work)
794 {
795         struct ttm_bo_device *bdev =
796             container_of(work, struct ttm_bo_device, wq.work);
797
798         if (ttm_bo_delayed_delete(bdev, false)) {
799                 schedule_delayed_work(&bdev->wq,
800                                       ((hz / 100) < 1) ? 1 : hz / 100);
801         }
802 }
803
804 /*
805  * NOTE: bdev->vm_lock already held on call, this function release it.
806  */
807 static void ttm_bo_release(struct kref *kref)
808 {
809         struct ttm_buffer_object *bo =
810             container_of(kref, struct ttm_buffer_object, kref);
811         struct ttm_bo_device *bdev = bo->bdev;
812         struct ttm_mem_type_manager *man = &bdev->man[bo->mem.mem_type];
813         int release_active;
814
815         if (atomic_read(&bo->kref.refcount) > 0) {
816                 lockmgr(&bdev->vm_lock, LK_RELEASE);
817                 return;
818         }
819         if (likely(bo->vm_node != NULL)) {
820                 RB_REMOVE(ttm_bo_device_buffer_objects,
821                                 &bdev->addr_space_rb, bo);
822                 drm_mm_put_block(bo->vm_node);
823                 bo->vm_node = NULL;
824         }
825
826         /*
827          * Should we clean up our implied list_kref?  Because ttm_bo_release()
828          * can be called reentrantly due to races (this may not be true any
829          * more with the lock management changes in the deref), it is possible
830          * to get here twice, but there's only one list_kref ref to drop and
831          * in the other path 'bo' can be kfree()d by another thread the
832          * instant we release our lock.
833          */
834         release_active = test_bit(TTM_BO_PRIV_FLAG_ACTIVE, &bo->priv_flags);
835         if (release_active) {
836                 clear_bit(TTM_BO_PRIV_FLAG_ACTIVE, &bo->priv_flags);
837                 lockmgr(&bdev->vm_lock, LK_RELEASE);
838                 ttm_mem_io_lock(man, false);
839                 ttm_mem_io_free_vm(bo);
840                 ttm_mem_io_unlock(man);
841                 ttm_bo_cleanup_refs_or_queue(bo);
842                 kref_put(&bo->list_kref, ttm_bo_release_list);
843         } else {
844                 lockmgr(&bdev->vm_lock, LK_RELEASE);
845         }
846 }
847
848 void ttm_bo_unref(struct ttm_buffer_object **p_bo)
849 {
850         struct ttm_buffer_object *bo = *p_bo;
851         struct ttm_bo_device *bdev = bo->bdev;
852
853         *p_bo = NULL;
854         lockmgr(&bdev->vm_lock, LK_EXCLUSIVE);
855         if (kref_put(&bo->kref, ttm_bo_release) == 0)
856                 lockmgr(&bdev->vm_lock, LK_RELEASE);
857 }
858 EXPORT_SYMBOL(ttm_bo_unref);
859
860 int ttm_bo_lock_delayed_workqueue(struct ttm_bo_device *bdev)
861 {
862         return cancel_delayed_work_sync(&bdev->wq);
863 }
864 EXPORT_SYMBOL(ttm_bo_lock_delayed_workqueue);
865
866 void ttm_bo_unlock_delayed_workqueue(struct ttm_bo_device *bdev, int resched)
867 {
868         if (resched)
869                 schedule_delayed_work(&bdev->wq,
870                                       ((hz / 100) < 1) ? 1 : hz / 100);
871 }
872 EXPORT_SYMBOL(ttm_bo_unlock_delayed_workqueue);
873
874 static int ttm_bo_evict(struct ttm_buffer_object *bo, bool interruptible,
875                         bool no_wait_gpu)
876 {
877         struct ttm_bo_device *bdev = bo->bdev;
878         struct ttm_mem_reg evict_mem;
879         struct ttm_placement placement;
880         int ret = 0;
881
882         lockmgr(&bdev->fence_lock, LK_EXCLUSIVE);
883         ret = ttm_bo_wait(bo, false, interruptible, no_wait_gpu);
884         lockmgr(&bdev->fence_lock, LK_RELEASE);
885
886         if (unlikely(ret != 0)) {
887                 if (ret != -ERESTARTSYS) {
888                         pr_err("Failed to expire sync object before buffer eviction\n");
889                 }
890                 goto out;
891         }
892
893         BUG_ON(!ttm_bo_is_reserved(bo));
894
895         evict_mem = bo->mem;
896         evict_mem.mm_node = NULL;
897         evict_mem.bus.io_reserved_vm = false;
898         evict_mem.bus.io_reserved_count = 0;
899
900         placement.num_placement = 0;
901         placement.num_busy_placement = 0;
902         bdev->driver->evict_flags(bo, &placement);
903         ret = ttm_bo_mem_space(bo, &placement, &evict_mem, interruptible,
904                                 no_wait_gpu);
905         if (ret) {
906                 if (ret != -ERESTARTSYS) {
907                         pr_err("Failed to find memory space for buffer 0x%p eviction\n",
908                                bo);
909                         ttm_bo_mem_space_debug(bo, &placement);
910                 }
911                 goto out;
912         }
913
914         ret = ttm_bo_handle_move_mem(bo, &evict_mem, true, interruptible,
915                                      no_wait_gpu);
916         if (ret) {
917                 if (ret != -ERESTARTSYS)
918                         pr_err("Buffer eviction failed\n");
919                 ttm_bo_mem_put(bo, &evict_mem);
920                 goto out;
921         }
922         bo->evicted = true;
923 out:
924         return ret;
925 }
926
927 static int ttm_mem_evict_first(struct ttm_bo_device *bdev,
928                                 uint32_t mem_type,
929                                 bool interruptible,
930                                 bool no_wait_gpu)
931 {
932         struct ttm_bo_global *glob = bdev->glob;
933         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
934         struct ttm_buffer_object *bo;
935         int ret = -EBUSY, put_count;
936
937         lockmgr(&glob->lru_lock, LK_EXCLUSIVE);
938         list_for_each_entry(bo, &man->lru, lru) {
939                 ret = ttm_bo_reserve_nolru(bo, false, true, false, 0);
940                 if (!ret)
941                         break;
942         }
943
944         if (ret) {
945                 lockmgr(&glob->lru_lock, LK_RELEASE);
946                 return ret;
947         }
948
949         kref_get(&bo->list_kref);
950
951         if (!list_empty(&bo->ddestroy)) {
952                 ret = ttm_bo_cleanup_refs_and_unlock(bo, interruptible,
953                                                      no_wait_gpu);
954                 kref_put(&bo->list_kref, ttm_bo_release_list);
955                 return ret;
956         }
957
958         put_count = ttm_bo_del_from_lru(bo);
959         lockmgr(&glob->lru_lock, LK_RELEASE);
960
961         BUG_ON(ret != 0);
962
963         ttm_bo_list_ref_sub(bo, put_count, true);
964
965         ret = ttm_bo_evict(bo, interruptible, no_wait_gpu);
966         ttm_bo_unreserve(bo);
967
968         kref_put(&bo->list_kref, ttm_bo_release_list);
969         return ret;
970 }
971
972 void ttm_bo_mem_put(struct ttm_buffer_object *bo, struct ttm_mem_reg *mem)
973 {
974         struct ttm_mem_type_manager *man = &bo->bdev->man[mem->mem_type];
975
976         if (mem->mm_node)
977                 (*man->func->put_node)(man, mem);
978 }
979 EXPORT_SYMBOL(ttm_bo_mem_put);
980
981 /**
982  * Repeatedly evict memory from the LRU for @mem_type until we create enough
983  * space, or we've evicted everything and there isn't enough space.
984  */
985 static int ttm_bo_mem_force_space(struct ttm_buffer_object *bo,
986                                         uint32_t mem_type,
987                                         const struct ttm_place *place,
988                                         struct ttm_mem_reg *mem,
989                                         bool interruptible,
990                                         bool no_wait_gpu)
991 {
992         struct ttm_bo_device *bdev = bo->bdev;
993         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
994         int ret;
995
996         do {
997                 ret = (*man->func->get_node)(man, bo, place, mem);
998                 if (unlikely(ret != 0))
999                         return ret;
1000                 if (mem->mm_node)
1001                         break;
1002                 ret = ttm_mem_evict_first(bdev, mem_type,
1003                                           interruptible, no_wait_gpu);
1004                 if (unlikely(ret != 0))
1005                         return ret;
1006         } while (1);
1007         if (mem->mm_node == NULL)
1008                 return -ENOMEM;
1009         mem->mem_type = mem_type;
1010         return 0;
1011 }
1012
1013 static uint32_t ttm_bo_select_caching(struct ttm_mem_type_manager *man,
1014                                       uint32_t cur_placement,
1015                                       uint32_t proposed_placement)
1016 {
1017         uint32_t caching = proposed_placement & TTM_PL_MASK_CACHING;
1018         uint32_t result = proposed_placement & ~TTM_PL_MASK_CACHING;
1019
1020         /**
1021          * Keep current caching if possible.
1022          */
1023
1024         if ((cur_placement & caching) != 0)
1025                 result |= (cur_placement & caching);
1026         else if ((man->default_caching & caching) != 0)
1027                 result |= man->default_caching;
1028         else if ((TTM_PL_FLAG_CACHED & caching) != 0)
1029                 result |= TTM_PL_FLAG_CACHED;
1030         else if ((TTM_PL_FLAG_WC & caching) != 0)
1031                 result |= TTM_PL_FLAG_WC;
1032         else if ((TTM_PL_FLAG_UNCACHED & caching) != 0)
1033                 result |= TTM_PL_FLAG_UNCACHED;
1034
1035         return result;
1036 }
1037
1038 static bool ttm_bo_mt_compatible(struct ttm_mem_type_manager *man,
1039                                  uint32_t mem_type,
1040                                  const struct ttm_place *place,
1041                                  uint32_t *masked_placement)
1042 {
1043         uint32_t cur_flags = ttm_bo_type_flags(mem_type);
1044
1045         if ((cur_flags & place->flags & TTM_PL_MASK_MEM) == 0)
1046                 return false;
1047
1048         if ((place->flags & man->available_caching) == 0)
1049                 return false;
1050
1051         cur_flags |= (place->flags & man->available_caching);
1052
1053         *masked_placement = cur_flags;
1054         return true;
1055 }
1056
1057 /**
1058  * Creates space for memory region @mem according to its type.
1059  *
1060  * This function first searches for free space in compatible memory types in
1061  * the priority order defined by the driver.  If free space isn't found, then
1062  * ttm_bo_mem_force_space is attempted in priority order to evict and find
1063  * space.
1064  */
1065 int ttm_bo_mem_space(struct ttm_buffer_object *bo,
1066                         struct ttm_placement *placement,
1067                         struct ttm_mem_reg *mem,
1068                         bool interruptible,
1069                         bool no_wait_gpu)
1070 {
1071         struct ttm_bo_device *bdev = bo->bdev;
1072         struct ttm_mem_type_manager *man;
1073         uint32_t mem_type = TTM_PL_SYSTEM;
1074         uint32_t cur_flags = 0;
1075         bool type_found = false;
1076         bool type_ok = false;
1077         bool has_erestartsys = false;
1078         int i, ret;
1079
1080         mem->mm_node = NULL;
1081         for (i = 0; i < placement->num_placement; ++i) {
1082                 const struct ttm_place *place = &placement->placement[i];
1083
1084                 ret = ttm_mem_type_from_place(place, &mem_type);
1085                 if (ret)
1086                         return ret;
1087                 man = &bdev->man[mem_type];
1088
1089                 type_ok = ttm_bo_mt_compatible(man, mem_type, place,
1090                                                 &cur_flags);
1091
1092                 if (!type_ok)
1093                         continue;
1094
1095                 cur_flags = ttm_bo_select_caching(man, bo->mem.placement,
1096                                                   cur_flags);
1097                 /*
1098                  * Use the access and other non-mapping-related flag bits from
1099                  * the memory placement flags to the current flags
1100                  */
1101                 ttm_flag_masked(&cur_flags, place->flags,
1102                                 ~TTM_PL_MASK_MEMTYPE);
1103
1104                 if (mem_type == TTM_PL_SYSTEM)
1105                         break;
1106
1107                 if (man->has_type && man->use_type) {
1108                         type_found = true;
1109                         ret = (*man->func->get_node)(man, bo, place, mem);
1110                         if (unlikely(ret))
1111                                 return ret;
1112                 }
1113                 if (mem->mm_node)
1114                         break;
1115         }
1116
1117         if ((type_ok && (mem_type == TTM_PL_SYSTEM)) || mem->mm_node) {
1118                 mem->mem_type = mem_type;
1119                 mem->placement = cur_flags;
1120                 return 0;
1121         }
1122
1123         if (!type_found)
1124                 return -EINVAL;
1125
1126         for (i = 0; i < placement->num_busy_placement; ++i) {
1127                 const struct ttm_place *place = &placement->busy_placement[i];
1128
1129                 ret = ttm_mem_type_from_place(place, &mem_type);
1130                 if (ret)
1131                         return ret;
1132                 man = &bdev->man[mem_type];
1133                 if (!man->has_type)
1134                         continue;
1135                 if (!ttm_bo_mt_compatible(man, mem_type, place, &cur_flags))
1136                         continue;
1137
1138                 cur_flags = ttm_bo_select_caching(man, bo->mem.placement,
1139                                                   cur_flags);
1140                 /*
1141                  * Use the access and other non-mapping-related flag bits from
1142                  * the memory placement flags to the current flags
1143                  */
1144                 ttm_flag_masked(&cur_flags, place->flags,
1145                                 ~TTM_PL_MASK_MEMTYPE);
1146
1147                 if (mem_type == TTM_PL_SYSTEM) {
1148                         mem->mem_type = mem_type;
1149                         mem->placement = cur_flags;
1150                         mem->mm_node = NULL;
1151                         return 0;
1152                 }
1153
1154                 ret = ttm_bo_mem_force_space(bo, mem_type, place, mem,
1155                                                 interruptible, no_wait_gpu);
1156                 if (ret == 0 && mem->mm_node) {
1157                         mem->placement = cur_flags;
1158                         return 0;
1159                 }
1160                 if (ret == -ERESTARTSYS)
1161                         has_erestartsys = true;
1162         }
1163         ret = (has_erestartsys) ? -ERESTARTSYS : -ENOMEM;
1164         return ret;
1165 }
1166 EXPORT_SYMBOL(ttm_bo_mem_space);
1167
1168 static int ttm_bo_move_buffer(struct ttm_buffer_object *bo,
1169                         struct ttm_placement *placement,
1170                         bool interruptible,
1171                         bool no_wait_gpu)
1172 {
1173         int ret = 0;
1174         struct ttm_mem_reg mem;
1175         struct ttm_bo_device *bdev = bo->bdev;
1176
1177         BUG_ON(!ttm_bo_is_reserved(bo));
1178
1179         /*
1180          * FIXME: It's possible to pipeline buffer moves.
1181          * Have the driver move function wait for idle when necessary,
1182          * instead of doing it here.
1183          */
1184         lockmgr(&bdev->fence_lock, LK_EXCLUSIVE);
1185         ret = ttm_bo_wait(bo, false, interruptible, no_wait_gpu);
1186         lockmgr(&bdev->fence_lock, LK_RELEASE);
1187         if (ret)
1188                 return ret;
1189         mem.num_pages = bo->num_pages;
1190         mem.size = mem.num_pages << PAGE_SHIFT;
1191         mem.page_alignment = bo->mem.page_alignment;
1192         mem.bus.io_reserved_vm = false;
1193         mem.bus.io_reserved_count = 0;
1194         /*
1195          * Determine where to move the buffer.
1196          */
1197         ret = ttm_bo_mem_space(bo, placement, &mem,
1198                                interruptible, no_wait_gpu);
1199         if (ret)
1200                 goto out_unlock;
1201         ret = ttm_bo_handle_move_mem(bo, &mem, false,
1202                                      interruptible, no_wait_gpu);
1203 out_unlock:
1204         if (ret && mem.mm_node)
1205                 ttm_bo_mem_put(bo, &mem);
1206         return ret;
1207 }
1208
1209 static bool ttm_bo_mem_compat(struct ttm_placement *placement,
1210                               struct ttm_mem_reg *mem,
1211                               uint32_t *new_flags)
1212 {
1213         int i;
1214
1215         for (i = 0; i < placement->num_placement; i++) {
1216                 const struct ttm_place *heap = &placement->placement[i];
1217                 if (mem->mm_node &&
1218                     (mem->start < heap->fpfn ||
1219                      (heap->lpfn != 0 && (mem->start + mem->num_pages) > heap->lpfn)))
1220                         continue;
1221
1222                 *new_flags = heap->flags;
1223                 if ((*new_flags & mem->placement & TTM_PL_MASK_CACHING) &&
1224                     (*new_flags & mem->placement & TTM_PL_MASK_MEM))
1225                         return true;
1226         }
1227
1228         for (i = 0; i < placement->num_busy_placement; i++) {
1229                 const struct ttm_place *heap = &placement->busy_placement[i];
1230                 if (mem->mm_node &&
1231                     (mem->start < heap->fpfn ||
1232                      (heap->lpfn != 0 && (mem->start + mem->num_pages) > heap->lpfn)))
1233                         continue;
1234
1235                 *new_flags = heap->flags;
1236                 if ((*new_flags & mem->placement & TTM_PL_MASK_CACHING) &&
1237                     (*new_flags & mem->placement & TTM_PL_MASK_MEM))
1238                         return true;
1239         }
1240
1241         return false;
1242 }
1243
1244 int ttm_bo_validate(struct ttm_buffer_object *bo,
1245                         struct ttm_placement *placement,
1246                         bool interruptible,
1247                         bool no_wait_gpu)
1248 {
1249         int ret;
1250         uint32_t new_flags;
1251
1252         BUG_ON(!ttm_bo_is_reserved(bo));
1253         /*
1254          * Check whether we need to move buffer.
1255          */
1256         if (!ttm_bo_mem_compat(placement, &bo->mem, &new_flags)) {
1257                 ret = ttm_bo_move_buffer(bo, placement, interruptible,
1258                                          no_wait_gpu);
1259                 if (ret)
1260                         return ret;
1261         } else {
1262                 /*
1263                  * Use the access and other non-mapping-related flag bits from
1264                  * the compatible memory placement flags to the active flags
1265                  */
1266                 ttm_flag_masked(&bo->mem.placement, new_flags,
1267                                 ~TTM_PL_MASK_MEMTYPE);
1268         }
1269         /*
1270          * We might need to add a TTM.
1271          */
1272         if (bo->mem.mem_type == TTM_PL_SYSTEM && bo->ttm == NULL) {
1273                 ret = ttm_bo_add_ttm(bo, true);
1274                 if (ret)
1275                         return ret;
1276         }
1277         return 0;
1278 }
1279 EXPORT_SYMBOL(ttm_bo_validate);
1280
1281 int ttm_bo_init(struct ttm_bo_device *bdev,
1282                 struct ttm_buffer_object *bo,
1283                 unsigned long size,
1284                 enum ttm_bo_type type,
1285                 struct ttm_placement *placement,
1286                 uint32_t page_alignment,
1287                 bool interruptible,
1288                 struct vm_object *persistent_swap_storage,
1289                 size_t acc_size,
1290                 struct sg_table *sg,
1291                 void (*destroy) (struct ttm_buffer_object *))
1292 {
1293         int ret = 0;
1294         unsigned long num_pages;
1295         struct ttm_mem_global *mem_glob = bdev->glob->mem_glob;
1296
1297         ret = ttm_mem_global_alloc(mem_glob, acc_size, false, false);
1298         if (ret) {
1299                 pr_err("Out of kernel memory\n");
1300                 if (destroy)
1301                         (*destroy)(bo);
1302                 else
1303                         kfree(bo);
1304                 return -ENOMEM;
1305         }
1306
1307         num_pages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
1308         if (num_pages == 0) {
1309                 pr_err("Illegal buffer object size\n");
1310                 if (destroy)
1311                         (*destroy)(bo);
1312                 else
1313                         kfree(bo);
1314                 ttm_mem_global_free(mem_glob, acc_size);
1315                 return -EINVAL;
1316         }
1317         bo->destroy = destroy;
1318
1319         kref_init(&bo->kref);
1320         kref_init(&bo->list_kref);
1321         atomic_set(&bo->cpu_writers, 0);
1322         atomic_set(&bo->reserved, 1);
1323         init_waitqueue_head(&bo->event_queue);
1324         INIT_LIST_HEAD(&bo->lru);
1325         INIT_LIST_HEAD(&bo->ddestroy);
1326         INIT_LIST_HEAD(&bo->swap);
1327         INIT_LIST_HEAD(&bo->io_reserve_lru);
1328         /*bzero(&bo->vm_rb, sizeof(bo->vm_rb));*/
1329         bo->bdev = bdev;
1330         bo->glob = bdev->glob;
1331         bo->type = type;
1332         bo->num_pages = num_pages;
1333         bo->mem.size = num_pages << PAGE_SHIFT;
1334         bo->mem.mem_type = TTM_PL_SYSTEM;
1335         bo->mem.num_pages = bo->num_pages;
1336         bo->mem.mm_node = NULL;
1337         bo->mem.page_alignment = page_alignment;
1338         bo->mem.bus.io_reserved_vm = false;
1339         bo->mem.bus.io_reserved_count = 0;
1340         bo->priv_flags = 0;
1341         bo->mem.placement = (TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED);
1342         bo->seq_valid = false;
1343         bo->persistent_swap_storage = persistent_swap_storage;
1344         bo->acc_size = acc_size;
1345         bo->sg = sg;
1346         atomic_inc(&bo->glob->bo_count);
1347
1348         /*
1349          * Mirror ref from kref_init() for list_kref.
1350          */
1351         set_bit(TTM_BO_PRIV_FLAG_ACTIVE, &bo->priv_flags);
1352
1353         /*
1354          * For ttm_bo_type_device buffers, allocate
1355          * address space from the device.
1356          */
1357         if (bo->type == ttm_bo_type_device ||
1358             bo->type == ttm_bo_type_sg) {
1359                 ret = ttm_bo_setup_vm(bo);
1360                 if (ret)
1361                         goto out_err;
1362         }
1363
1364         ret = ttm_bo_validate(bo, placement, interruptible, false);
1365         if (ret)
1366                 goto out_err;
1367
1368         ttm_bo_unreserve(bo);
1369         return 0;
1370
1371 out_err:
1372         ttm_bo_unreserve(bo);
1373         ttm_bo_unref(&bo);
1374
1375         return ret;
1376 }
1377 EXPORT_SYMBOL(ttm_bo_init);
1378
1379 size_t ttm_bo_acc_size(struct ttm_bo_device *bdev,
1380                        unsigned long bo_size,
1381                        unsigned struct_size)
1382 {
1383         unsigned npages = (PAGE_ALIGN(bo_size)) >> PAGE_SHIFT;
1384         size_t size = 0;
1385
1386         size += ttm_round_pot(struct_size);
1387         size += PAGE_ALIGN(npages * sizeof(void *));
1388         size += ttm_round_pot(sizeof(struct ttm_tt));
1389         return size;
1390 }
1391 EXPORT_SYMBOL(ttm_bo_acc_size);
1392
1393 size_t ttm_bo_dma_acc_size(struct ttm_bo_device *bdev,
1394                            unsigned long bo_size,
1395                            unsigned struct_size)
1396 {
1397         unsigned npages = (PAGE_ALIGN(bo_size)) >> PAGE_SHIFT;
1398         size_t size = 0;
1399
1400         size += ttm_round_pot(struct_size);
1401         size += PAGE_ALIGN(npages * sizeof(void *));
1402         size += PAGE_ALIGN(npages * sizeof(dma_addr_t));
1403         size += ttm_round_pot(sizeof(struct ttm_dma_tt));
1404         return size;
1405 }
1406 EXPORT_SYMBOL(ttm_bo_dma_acc_size);
1407
1408 int ttm_bo_create(struct ttm_bo_device *bdev,
1409                         unsigned long size,
1410                         enum ttm_bo_type type,
1411                         struct ttm_placement *placement,
1412                         uint32_t page_alignment,
1413                         bool interruptible,
1414                         struct vm_object *persistent_swap_storage,
1415                         struct ttm_buffer_object **p_bo)
1416 {
1417         struct ttm_buffer_object *bo;
1418         size_t acc_size;
1419         int ret;
1420
1421         *p_bo = NULL;
1422         bo = kzalloc(sizeof(*bo), GFP_KERNEL);
1423         if (unlikely(bo == NULL))
1424                 return -ENOMEM;
1425
1426         acc_size = ttm_bo_acc_size(bdev, size, sizeof(struct ttm_buffer_object));
1427         ret = ttm_bo_init(bdev, bo, size, type, placement, page_alignment,
1428                           interruptible, persistent_swap_storage, acc_size,
1429                           NULL, NULL);
1430         if (likely(ret == 0))
1431                 *p_bo = bo;
1432
1433         return ret;
1434 }
1435 EXPORT_SYMBOL(ttm_bo_create);
1436
1437 static int ttm_bo_force_list_clean(struct ttm_bo_device *bdev,
1438                                         unsigned mem_type, bool allow_errors)
1439 {
1440         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
1441         struct ttm_bo_global *glob = bdev->glob;
1442         int ret;
1443
1444         /*
1445          * Can't use standard list traversal since we're unlocking.
1446          */
1447
1448         lockmgr(&glob->lru_lock, LK_EXCLUSIVE);
1449         while (!list_empty(&man->lru)) {
1450                 lockmgr(&glob->lru_lock, LK_RELEASE);
1451                 ret = ttm_mem_evict_first(bdev, mem_type, false, false);
1452                 if (ret) {
1453                         if (allow_errors) {
1454                                 return ret;
1455                         } else {
1456                                 pr_err("Cleanup eviction failed\n");
1457                         }
1458                 }
1459                 lockmgr(&glob->lru_lock, LK_EXCLUSIVE);
1460         }
1461         lockmgr(&glob->lru_lock, LK_RELEASE);
1462         return 0;
1463 }
1464
1465 int ttm_bo_clean_mm(struct ttm_bo_device *bdev, unsigned mem_type)
1466 {
1467         struct ttm_mem_type_manager *man;
1468         int ret = -EINVAL;
1469
1470         if (mem_type >= TTM_NUM_MEM_TYPES) {
1471                 pr_err("Illegal memory type %d\n", mem_type);
1472                 return ret;
1473         }
1474         man = &bdev->man[mem_type];
1475
1476         if (!man->has_type) {
1477                 pr_err("Trying to take down uninitialized memory manager type %u\n",
1478                        mem_type);
1479                 return ret;
1480         }
1481
1482         man->use_type = false;
1483         man->has_type = false;
1484
1485         ret = 0;
1486         if (mem_type > 0) {
1487                 ttm_bo_force_list_clean(bdev, mem_type, false);
1488
1489                 ret = (*man->func->takedown)(man);
1490         }
1491
1492         return ret;
1493 }
1494 EXPORT_SYMBOL(ttm_bo_clean_mm);
1495
1496 int ttm_bo_evict_mm(struct ttm_bo_device *bdev, unsigned mem_type)
1497 {
1498         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
1499
1500         if (mem_type == 0 || mem_type >= TTM_NUM_MEM_TYPES) {
1501                 pr_err("Illegal memory manager memory type %u\n", mem_type);
1502                 return -EINVAL;
1503         }
1504
1505         if (!man->has_type) {
1506                 pr_err("Memory type %u has not been initialized\n", mem_type);
1507                 return 0;
1508         }
1509
1510         return ttm_bo_force_list_clean(bdev, mem_type, true);
1511 }
1512 EXPORT_SYMBOL(ttm_bo_evict_mm);
1513
1514 int ttm_bo_init_mm(struct ttm_bo_device *bdev, unsigned type,
1515                         unsigned long p_size)
1516 {
1517         int ret = -EINVAL;
1518         struct ttm_mem_type_manager *man;
1519
1520         BUG_ON(type >= TTM_NUM_MEM_TYPES);
1521         man = &bdev->man[type];
1522         BUG_ON(man->has_type);
1523         man->io_reserve_fastpath = true;
1524         man->use_io_reserve_lru = false;
1525         lockinit(&man->io_reserve_mutex, "ttmman", 0, LK_CANRECURSE);
1526         INIT_LIST_HEAD(&man->io_reserve_lru);
1527
1528         ret = bdev->driver->init_mem_type(bdev, type, man);
1529         if (ret)
1530                 return ret;
1531         man->bdev = bdev;
1532
1533         ret = 0;
1534         if (type != TTM_PL_SYSTEM) {
1535                 ret = (*man->func->init)(man, p_size);
1536                 if (ret)
1537                         return ret;
1538         }
1539         man->has_type = true;
1540         man->use_type = true;
1541         man->size = p_size;
1542
1543         INIT_LIST_HEAD(&man->lru);
1544
1545         return 0;
1546 }
1547 EXPORT_SYMBOL(ttm_bo_init_mm);
1548
1549 static void ttm_bo_global_kobj_release(struct kobject *kobj)
1550 {
1551         struct ttm_bo_global *glob =
1552                 container_of(kobj, struct ttm_bo_global, kobj);
1553
1554         ttm_mem_unregister_shrink(glob->mem_glob, &glob->shrink);
1555         __free_page(glob->dummy_read_page);
1556         kfree(glob);
1557 }
1558
1559 void ttm_bo_global_release(struct drm_global_reference *ref)
1560 {
1561         struct ttm_bo_global *glob = ref->object;
1562
1563         kobject_del(&glob->kobj);
1564         kobject_put(&glob->kobj);
1565 }
1566 EXPORT_SYMBOL(ttm_bo_global_release);
1567
1568 int ttm_bo_global_init(struct drm_global_reference *ref)
1569 {
1570         struct ttm_bo_global_ref *bo_ref =
1571                 container_of(ref, struct ttm_bo_global_ref, ref);
1572         struct ttm_bo_global *glob = ref->object;
1573         int ret;
1574
1575         lockinit(&glob->device_list_mutex, "ttmdlm", 0, LK_CANRECURSE);
1576         lockinit(&glob->lru_lock, "ttmlru", 0, LK_CANRECURSE);
1577         glob->mem_glob = bo_ref->mem_glob;
1578         glob->dummy_read_page = (struct page *)vm_page_alloc_contig(
1579             0, VM_MAX_ADDRESS, PAGE_SIZE, 0, 1*PAGE_SIZE, VM_MEMATTR_UNCACHEABLE);
1580
1581         if (unlikely(glob->dummy_read_page == NULL)) {
1582                 ret = -ENOMEM;
1583                 goto out_no_drp;
1584         }
1585
1586         INIT_LIST_HEAD(&glob->swap_lru);
1587         INIT_LIST_HEAD(&glob->device_list);
1588
1589         ttm_mem_init_shrink(&glob->shrink, ttm_bo_swapout);
1590         ret = ttm_mem_register_shrink(glob->mem_glob, &glob->shrink);
1591         if (unlikely(ret != 0)) {
1592                 pr_err("Could not register buffer object swapout\n");
1593                 goto out_no_shrink;
1594         }
1595
1596         atomic_set(&glob->bo_count, 0);
1597
1598         ret = kobject_init_and_add(
1599                 &glob->kobj, &ttm_bo_glob_kobj_type, ttm_get_kobj(), "buffer_objects");
1600         if (unlikely(ret != 0))
1601                 kobject_put(&glob->kobj);
1602         return ret;
1603 out_no_shrink:
1604         __free_page(glob->dummy_read_page);
1605 out_no_drp:
1606         kfree(glob);
1607         return ret;
1608 }
1609 EXPORT_SYMBOL(ttm_bo_global_init);
1610
1611
1612 int ttm_bo_device_release(struct ttm_bo_device *bdev)
1613 {
1614         int ret = 0;
1615         unsigned i = TTM_NUM_MEM_TYPES;
1616         struct ttm_mem_type_manager *man;
1617         struct ttm_bo_global *glob = bdev->glob;
1618
1619         while (i--) {
1620                 man = &bdev->man[i];
1621                 if (man->has_type) {
1622                         man->use_type = false;
1623                         if ((i != TTM_PL_SYSTEM) && ttm_bo_clean_mm(bdev, i)) {
1624                                 ret = -EBUSY;
1625                                 pr_err("DRM memory manager type %d is not clean\n",
1626                                        i);
1627                         }
1628                         man->has_type = false;
1629                 }
1630         }
1631
1632         lockmgr(&glob->device_list_mutex, LK_EXCLUSIVE);
1633         list_del(&bdev->device_list);
1634         lockmgr(&glob->device_list_mutex, LK_RELEASE);
1635
1636         cancel_delayed_work_sync(&bdev->wq);
1637
1638         while (ttm_bo_delayed_delete(bdev, true))
1639                 ;
1640
1641         lockmgr(&glob->lru_lock, LK_EXCLUSIVE);
1642         if (list_empty(&bdev->ddestroy))
1643                 TTM_DEBUG("Delayed destroy list was clean\n");
1644
1645         if (list_empty(&bdev->man[0].lru))
1646                 TTM_DEBUG("Swap list was clean\n");
1647         lockmgr(&glob->lru_lock, LK_RELEASE);
1648
1649         BUG_ON(!drm_mm_clean(&bdev->addr_space_mm));
1650         lockmgr(&bdev->vm_lock, LK_EXCLUSIVE);
1651         drm_mm_takedown(&bdev->addr_space_mm);
1652         lockmgr(&bdev->vm_lock, LK_RELEASE);
1653
1654         return ret;
1655 }
1656 EXPORT_SYMBOL(ttm_bo_device_release);
1657
1658 int ttm_bo_device_init(struct ttm_bo_device *bdev,
1659                        struct ttm_bo_global *glob,
1660                        struct ttm_bo_driver *driver,
1661                        uint64_t file_page_offset,
1662                        bool need_dma32)
1663 {
1664         int ret = -EINVAL;
1665
1666         lockinit(&bdev->vm_lock, "ttmvml", 0, LK_CANRECURSE);
1667         bdev->driver = driver;
1668
1669         memset(bdev->man, 0, sizeof(bdev->man));
1670
1671         /*
1672          * Initialize the system memory buffer type.
1673          * Other types need to be driver / IOCTL initialized.
1674          */
1675         ret = ttm_bo_init_mm(bdev, TTM_PL_SYSTEM, 0);
1676         if (unlikely(ret != 0))
1677                 goto out_no_sys;
1678
1679         RB_INIT(&bdev->addr_space_rb);
1680         drm_mm_init(&bdev->addr_space_mm, file_page_offset, 0x10000000);
1681
1682         INIT_DELAYED_WORK(&bdev->wq, ttm_bo_delayed_workqueue);
1683         INIT_LIST_HEAD(&bdev->ddestroy);
1684         bdev->dev_mapping = NULL;
1685         bdev->glob = glob;
1686         bdev->need_dma32 = need_dma32;
1687         bdev->val_seq = 0;
1688         lockinit(&bdev->fence_lock, "ttmfence", 0, LK_CANRECURSE);
1689         lockmgr(&glob->device_list_mutex, LK_EXCLUSIVE);
1690         list_add_tail(&bdev->device_list, &glob->device_list);
1691         lockmgr(&glob->device_list_mutex, LK_RELEASE);
1692
1693         return 0;
1694 out_no_sys:
1695         return ret;
1696 }
1697 EXPORT_SYMBOL(ttm_bo_device_init);
1698
1699 /*
1700  * buffer object vm functions.
1701  */
1702
1703 bool ttm_mem_reg_is_pci(struct ttm_bo_device *bdev, struct ttm_mem_reg *mem)
1704 {
1705         struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
1706
1707         if (!(man->flags & TTM_MEMTYPE_FLAG_FIXED)) {
1708                 if (mem->mem_type == TTM_PL_SYSTEM)
1709                         return false;
1710
1711                 if (man->flags & TTM_MEMTYPE_FLAG_CMA)
1712                         return false;
1713
1714                 if (mem->placement & TTM_PL_FLAG_CACHED)
1715                         return false;
1716         }
1717         return true;
1718 }
1719
1720 void ttm_bo_unmap_virtual_locked(struct ttm_buffer_object *bo)
1721 {
1722
1723         ttm_bo_release_mmap(bo);
1724         ttm_mem_io_free_vm(bo);
1725 }
1726
1727 void ttm_bo_unmap_virtual(struct ttm_buffer_object *bo)
1728 {
1729         struct ttm_bo_device *bdev = bo->bdev;
1730         struct ttm_mem_type_manager *man = &bdev->man[bo->mem.mem_type];
1731
1732         ttm_mem_io_lock(man, false);
1733         ttm_bo_unmap_virtual_locked(bo);
1734         ttm_mem_io_unlock(man);
1735 }
1736
1737
1738 EXPORT_SYMBOL(ttm_bo_unmap_virtual);
1739
1740 static void ttm_bo_vm_insert_rb(struct ttm_buffer_object *bo)
1741 {
1742         struct ttm_bo_device *bdev = bo->bdev;
1743
1744         /* The caller acquired bdev->vm_lock. */
1745         RB_INSERT(ttm_bo_device_buffer_objects, &bdev->addr_space_rb, bo);
1746 }
1747
1748 /**
1749  * ttm_bo_setup_vm:
1750  *
1751  * @bo: the buffer to allocate address space for
1752  *
1753  * Allocate address space in the drm device so that applications
1754  * can mmap the buffer and access the contents. This only
1755  * applies to ttm_bo_type_device objects as others are not
1756  * placed in the drm device address space.
1757  */
1758
1759 static int ttm_bo_setup_vm(struct ttm_buffer_object *bo)
1760 {
1761         struct ttm_bo_device *bdev = bo->bdev;
1762         int ret;
1763
1764 retry_pre_get:
1765         ret = drm_mm_pre_get(&bdev->addr_space_mm);
1766         if (unlikely(ret != 0))
1767                 return ret;
1768
1769         lockmgr(&bdev->vm_lock, LK_EXCLUSIVE);
1770         bo->vm_node = drm_mm_search_free(&bdev->addr_space_mm,
1771                                          bo->mem.num_pages, 0, 0);
1772
1773         if (unlikely(bo->vm_node == NULL)) {
1774                 ret = -ENOMEM;
1775                 goto out_unlock;
1776         }
1777
1778         bo->vm_node = drm_mm_get_block_atomic(bo->vm_node,
1779                                               bo->mem.num_pages, 0);
1780
1781         if (unlikely(bo->vm_node == NULL)) {
1782                 lockmgr(&bdev->vm_lock, LK_RELEASE);
1783                 goto retry_pre_get;
1784         }
1785
1786         ttm_bo_vm_insert_rb(bo);
1787         lockmgr(&bdev->vm_lock, LK_RELEASE);
1788         bo->addr_space_offset = ((uint64_t) bo->vm_node->start) << PAGE_SHIFT;
1789
1790         return 0;
1791 out_unlock:
1792         lockmgr(&bdev->vm_lock, LK_RELEASE);
1793         return ret;
1794 }
1795
1796 int ttm_bo_wait(struct ttm_buffer_object *bo,
1797                 bool lazy, bool interruptible, bool no_wait)
1798 {
1799         struct ttm_bo_driver *driver = bo->bdev->driver;
1800         struct ttm_bo_device *bdev = bo->bdev;
1801         void *sync_obj;
1802         int ret = 0;
1803
1804         if (likely(bo->sync_obj == NULL))
1805                 return 0;
1806
1807         while (bo->sync_obj) {
1808
1809                 if (driver->sync_obj_signaled(bo->sync_obj)) {
1810                         void *tmp_obj = bo->sync_obj;
1811                         bo->sync_obj = NULL;
1812                         clear_bit(TTM_BO_PRIV_FLAG_MOVING, &bo->priv_flags);
1813                         lockmgr(&bdev->fence_lock, LK_RELEASE);
1814                         driver->sync_obj_unref(&tmp_obj);
1815                         lockmgr(&bdev->fence_lock, LK_EXCLUSIVE);
1816                         continue;
1817                 }
1818
1819                 if (no_wait)
1820                         return -EBUSY;
1821
1822                 sync_obj = driver->sync_obj_ref(bo->sync_obj);
1823                 lockmgr(&bdev->fence_lock, LK_RELEASE);
1824                 ret = driver->sync_obj_wait(sync_obj,
1825                                             lazy, interruptible);
1826                 if (unlikely(ret != 0)) {
1827                         driver->sync_obj_unref(&sync_obj);
1828                         lockmgr(&bdev->fence_lock, LK_EXCLUSIVE);
1829                         return ret;
1830                 }
1831                 lockmgr(&bdev->fence_lock, LK_EXCLUSIVE);
1832                 if (likely(bo->sync_obj == sync_obj)) {
1833                         void *tmp_obj = bo->sync_obj;
1834                         bo->sync_obj = NULL;
1835                         clear_bit(TTM_BO_PRIV_FLAG_MOVING,
1836                                   &bo->priv_flags);
1837                         lockmgr(&bdev->fence_lock, LK_RELEASE);
1838                         driver->sync_obj_unref(&sync_obj);
1839                         driver->sync_obj_unref(&tmp_obj);
1840                         lockmgr(&bdev->fence_lock, LK_EXCLUSIVE);
1841                 } else {
1842                         lockmgr(&bdev->fence_lock, LK_RELEASE);
1843                         driver->sync_obj_unref(&sync_obj);
1844                         lockmgr(&bdev->fence_lock, LK_EXCLUSIVE);
1845                 }
1846         }
1847         return 0;
1848 }
1849 EXPORT_SYMBOL(ttm_bo_wait);
1850
1851 int ttm_bo_synccpu_write_grab(struct ttm_buffer_object *bo, bool no_wait)
1852 {
1853         struct ttm_bo_device *bdev = bo->bdev;
1854         int ret = 0;
1855
1856         /*
1857          * Using ttm_bo_reserve makes sure the lru lists are updated.
1858          */
1859
1860         ret = ttm_bo_reserve(bo, true, no_wait, false, 0);
1861         if (unlikely(ret != 0))
1862                 return ret;
1863         lockmgr(&bdev->fence_lock, LK_EXCLUSIVE);
1864         ret = ttm_bo_wait(bo, false, true, no_wait);
1865         lockmgr(&bdev->fence_lock, LK_RELEASE);
1866         if (likely(ret == 0))
1867                 atomic_inc(&bo->cpu_writers);
1868         ttm_bo_unreserve(bo);
1869         return ret;
1870 }
1871 EXPORT_SYMBOL(ttm_bo_synccpu_write_grab);
1872
1873 void ttm_bo_synccpu_write_release(struct ttm_buffer_object *bo)
1874 {
1875         atomic_dec(&bo->cpu_writers);
1876 }
1877 EXPORT_SYMBOL(ttm_bo_synccpu_write_release);
1878
1879 /**
1880  * A buffer object shrink method that tries to swap out the first
1881  * buffer object on the bo_global::swap_lru list.
1882  */
1883
1884 static int ttm_bo_swapout(struct ttm_mem_shrink *shrink)
1885 {
1886         struct ttm_bo_global *glob =
1887             container_of(shrink, struct ttm_bo_global, shrink);
1888         struct ttm_buffer_object *bo;
1889         int ret = -EBUSY;
1890         int put_count;
1891         uint32_t swap_placement = (TTM_PL_FLAG_CACHED | TTM_PL_FLAG_SYSTEM);
1892
1893         lockmgr(&glob->lru_lock, LK_EXCLUSIVE);
1894         list_for_each_entry(bo, &glob->swap_lru, swap) {
1895                 ret = ttm_bo_reserve_nolru(bo, false, true, false, 0);
1896                 if (!ret)
1897                         break;
1898         }
1899
1900         if (ret) {
1901                 lockmgr(&glob->lru_lock, LK_RELEASE);
1902                 return ret;
1903         }
1904
1905         kref_get(&bo->list_kref);
1906
1907         if (!list_empty(&bo->ddestroy)) {
1908                 ret = ttm_bo_cleanup_refs_and_unlock(bo, false, false);
1909                 kref_put(&bo->list_kref, ttm_bo_release_list);
1910                 return ret;
1911         }
1912
1913         put_count = ttm_bo_del_from_lru(bo);
1914         lockmgr(&glob->lru_lock, LK_RELEASE);
1915
1916         ttm_bo_list_ref_sub(bo, put_count, true);
1917
1918         /**
1919          * Wait for GPU, then move to system cached.
1920          */
1921
1922         lockmgr(&bo->bdev->fence_lock, LK_EXCLUSIVE);
1923         ret = ttm_bo_wait(bo, false, false, false);
1924         lockmgr(&bo->bdev->fence_lock, LK_RELEASE);
1925
1926         if (unlikely(ret != 0))
1927                 goto out;
1928
1929         if ((bo->mem.placement & swap_placement) != swap_placement) {
1930                 struct ttm_mem_reg evict_mem;
1931
1932                 evict_mem = bo->mem;
1933                 evict_mem.mm_node = NULL;
1934                 evict_mem.placement = TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED;
1935                 evict_mem.mem_type = TTM_PL_SYSTEM;
1936
1937                 ret = ttm_bo_handle_move_mem(bo, &evict_mem, true,
1938                                              false, false);
1939                 if (unlikely(ret != 0))
1940                         goto out;
1941         }
1942
1943         ttm_bo_unmap_virtual(bo);
1944
1945         /**
1946          * Swap out. Buffer will be swapped in again as soon as
1947          * anyone tries to access a ttm page.
1948          */
1949
1950         if (bo->bdev->driver->swap_notify)
1951                 bo->bdev->driver->swap_notify(bo);
1952
1953         ret = ttm_tt_swapout(bo->ttm, bo->persistent_swap_storage);
1954 out:
1955
1956         /**
1957          *
1958          * Unreserve without putting on LRU to avoid swapping out an
1959          * already swapped buffer.
1960          */
1961
1962         ttm_bo_unreserve_core(bo);
1963         kref_put(&bo->list_kref, ttm_bo_release_list);
1964         return ret;
1965 }
1966
1967 void ttm_bo_swapout_all(struct ttm_bo_device *bdev)
1968 {
1969         while (ttm_bo_swapout(&bdev->glob->shrink) == 0)
1970                 ;
1971 }
1972 EXPORT_SYMBOL(ttm_bo_swapout_all);