lib/Kconfig: make PRIME_NUMBERS not user selectable.
[sfrench/cifs-2.6.git] / drivers / gpu / drm / ttm / ttm_bo.c
1 /**************************************************************************
2  *
3  * Copyright (c) 2006-2009 VMware, Inc., Palo Alto, CA., USA
4  * All Rights Reserved.
5  *
6  * Permission is hereby granted, free of charge, to any person obtaining a
7  * copy of this software and associated documentation files (the
8  * "Software"), to deal in the Software without restriction, including
9  * without limitation the rights to use, copy, modify, merge, publish,
10  * distribute, sub license, and/or sell copies of the Software, and to
11  * permit persons to whom the Software is furnished to do so, subject to
12  * the following conditions:
13  *
14  * The above copyright notice and this permission notice (including the
15  * next paragraph) shall be included in all copies or substantial portions
16  * of the Software.
17  *
18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
19  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
20  * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
21  * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
22  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
23  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
24  * USE OR OTHER DEALINGS IN THE SOFTWARE.
25  *
26  **************************************************************************/
27 /*
28  * Authors: Thomas Hellstrom <thellstrom-at-vmware-dot-com>
29  */
30
31 #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 #include <linux/reservation.h>
44
45 #define TTM_ASSERT_LOCKED(param)
46 #define TTM_DEBUG(fmt, arg...)
47 #define TTM_BO_HASH_ORDER 13
48
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 pos;
61
62         pos = ffs(place->flags & TTM_PL_MASK_MEM);
63         if (unlikely(!pos))
64                 return -EINVAL;
65
66         *mem_type = pos - 1;
67         return 0;
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%08llX\n", man->gpu_offset);
78         pr_err("    size: %llu\n", 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 snprintf(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
131 static inline uint32_t ttm_bo_type_flags(unsigned type)
132 {
133         return 1 << (type);
134 }
135
136 static void ttm_bo_release_list(struct kref *list_kref)
137 {
138         struct ttm_buffer_object *bo =
139             container_of(list_kref, struct ttm_buffer_object, list_kref);
140         struct ttm_bo_device *bdev = bo->bdev;
141         size_t acc_size = bo->acc_size;
142
143         BUG_ON(atomic_read(&bo->list_kref.refcount));
144         BUG_ON(atomic_read(&bo->kref.refcount));
145         BUG_ON(atomic_read(&bo->cpu_writers));
146         BUG_ON(bo->mem.mm_node != NULL);
147         BUG_ON(!list_empty(&bo->lru));
148         BUG_ON(!list_empty(&bo->ddestroy));
149         ttm_tt_destroy(bo->ttm);
150         atomic_dec(&bo->glob->bo_count);
151         dma_fence_put(bo->moving);
152         if (bo->resv == &bo->ttm_resv)
153                 reservation_object_fini(&bo->ttm_resv);
154         mutex_destroy(&bo->wu_mutex);
155         if (bo->destroy)
156                 bo->destroy(bo);
157         else {
158                 kfree(bo);
159         }
160         ttm_mem_global_free(bdev->glob->mem_glob, acc_size);
161 }
162
163 void ttm_bo_add_to_lru(struct ttm_buffer_object *bo)
164 {
165         struct ttm_bo_device *bdev = bo->bdev;
166         struct ttm_mem_type_manager *man;
167
168         lockdep_assert_held(&bo->resv->lock.base);
169
170         if (!(bo->mem.placement & TTM_PL_FLAG_NO_EVICT)) {
171
172                 BUG_ON(!list_empty(&bo->lru));
173
174                 man = &bdev->man[bo->mem.mem_type];
175                 list_add_tail(&bo->lru, &man->lru[bo->priority]);
176                 kref_get(&bo->list_kref);
177
178                 if (bo->ttm && !(bo->ttm->page_flags & TTM_PAGE_FLAG_SG)) {
179                         list_add_tail(&bo->swap,
180                                       &bo->glob->swap_lru[bo->priority]);
181                         kref_get(&bo->list_kref);
182                 }
183         }
184 }
185 EXPORT_SYMBOL(ttm_bo_add_to_lru);
186
187 int ttm_bo_del_from_lru(struct ttm_buffer_object *bo)
188 {
189         int put_count = 0;
190
191         if (!list_empty(&bo->swap)) {
192                 list_del_init(&bo->swap);
193                 ++put_count;
194         }
195         if (!list_empty(&bo->lru)) {
196                 list_del_init(&bo->lru);
197                 ++put_count;
198         }
199
200         /*
201          * TODO: Add a driver hook to delete from
202          * driver-specific LRU's here.
203          */
204
205         return put_count;
206 }
207
208 static void ttm_bo_ref_bug(struct kref *list_kref)
209 {
210         BUG();
211 }
212
213 void ttm_bo_list_ref_sub(struct ttm_buffer_object *bo, int count,
214                          bool never_free)
215 {
216         kref_sub(&bo->list_kref, count,
217                  (never_free) ? ttm_bo_ref_bug : ttm_bo_release_list);
218 }
219
220 void ttm_bo_del_sub_from_lru(struct ttm_buffer_object *bo)
221 {
222         int put_count;
223
224         spin_lock(&bo->glob->lru_lock);
225         put_count = ttm_bo_del_from_lru(bo);
226         spin_unlock(&bo->glob->lru_lock);
227         ttm_bo_list_ref_sub(bo, put_count, true);
228 }
229 EXPORT_SYMBOL(ttm_bo_del_sub_from_lru);
230
231 void ttm_bo_move_to_lru_tail(struct ttm_buffer_object *bo)
232 {
233         int put_count = 0;
234
235         lockdep_assert_held(&bo->resv->lock.base);
236
237         put_count = ttm_bo_del_from_lru(bo);
238         ttm_bo_list_ref_sub(bo, put_count, true);
239         ttm_bo_add_to_lru(bo);
240 }
241 EXPORT_SYMBOL(ttm_bo_move_to_lru_tail);
242
243 /*
244  * Call bo->mutex locked.
245  */
246 static int ttm_bo_add_ttm(struct ttm_buffer_object *bo, bool zero_alloc)
247 {
248         struct ttm_bo_device *bdev = bo->bdev;
249         struct ttm_bo_global *glob = bo->glob;
250         int ret = 0;
251         uint32_t page_flags = 0;
252
253         TTM_ASSERT_LOCKED(&bo->mutex);
254         bo->ttm = NULL;
255
256         if (bdev->need_dma32)
257                 page_flags |= TTM_PAGE_FLAG_DMA32;
258
259         switch (bo->type) {
260         case ttm_bo_type_device:
261                 if (zero_alloc)
262                         page_flags |= TTM_PAGE_FLAG_ZERO_ALLOC;
263         case ttm_bo_type_kernel:
264                 bo->ttm = bdev->driver->ttm_tt_create(bdev, bo->num_pages << PAGE_SHIFT,
265                                                       page_flags, glob->dummy_read_page);
266                 if (unlikely(bo->ttm == NULL))
267                         ret = -ENOMEM;
268                 break;
269         case ttm_bo_type_sg:
270                 bo->ttm = bdev->driver->ttm_tt_create(bdev, bo->num_pages << PAGE_SHIFT,
271                                                       page_flags | TTM_PAGE_FLAG_SG,
272                                                       glob->dummy_read_page);
273                 if (unlikely(bo->ttm == NULL)) {
274                         ret = -ENOMEM;
275                         break;
276                 }
277                 bo->ttm->sg = bo->sg;
278                 break;
279         default:
280                 pr_err("Illegal buffer object type\n");
281                 ret = -EINVAL;
282                 break;
283         }
284
285         return ret;
286 }
287
288 static int ttm_bo_handle_move_mem(struct ttm_buffer_object *bo,
289                                   struct ttm_mem_reg *mem,
290                                   bool evict, bool interruptible,
291                                   bool no_wait_gpu)
292 {
293         struct ttm_bo_device *bdev = bo->bdev;
294         bool old_is_pci = ttm_mem_reg_is_pci(bdev, &bo->mem);
295         bool new_is_pci = ttm_mem_reg_is_pci(bdev, mem);
296         struct ttm_mem_type_manager *old_man = &bdev->man[bo->mem.mem_type];
297         struct ttm_mem_type_manager *new_man = &bdev->man[mem->mem_type];
298         int ret = 0;
299
300         if (old_is_pci || new_is_pci ||
301             ((mem->placement & bo->mem.placement & TTM_PL_MASK_CACHING) == 0)) {
302                 ret = ttm_mem_io_lock(old_man, true);
303                 if (unlikely(ret != 0))
304                         goto out_err;
305                 ttm_bo_unmap_virtual_locked(bo);
306                 ttm_mem_io_unlock(old_man);
307         }
308
309         /*
310          * Create and bind a ttm if required.
311          */
312
313         if (!(new_man->flags & TTM_MEMTYPE_FLAG_FIXED)) {
314                 if (bo->ttm == NULL) {
315                         bool zero = !(old_man->flags & TTM_MEMTYPE_FLAG_FIXED);
316                         ret = ttm_bo_add_ttm(bo, zero);
317                         if (ret)
318                                 goto out_err;
319                 }
320
321                 ret = ttm_tt_set_placement_caching(bo->ttm, mem->placement);
322                 if (ret)
323                         goto out_err;
324
325                 if (mem->mem_type != TTM_PL_SYSTEM) {
326                         ret = ttm_tt_bind(bo->ttm, mem);
327                         if (ret)
328                                 goto out_err;
329                 }
330
331                 if (bo->mem.mem_type == TTM_PL_SYSTEM) {
332                         if (bdev->driver->move_notify)
333                                 bdev->driver->move_notify(bo, evict, mem);
334                         bo->mem = *mem;
335                         mem->mm_node = NULL;
336                         goto moved;
337                 }
338         }
339
340         if (bdev->driver->move_notify)
341                 bdev->driver->move_notify(bo, evict, mem);
342
343         if (!(old_man->flags & TTM_MEMTYPE_FLAG_FIXED) &&
344             !(new_man->flags & TTM_MEMTYPE_FLAG_FIXED))
345                 ret = ttm_bo_move_ttm(bo, interruptible, no_wait_gpu, mem);
346         else if (bdev->driver->move)
347                 ret = bdev->driver->move(bo, evict, interruptible,
348                                          no_wait_gpu, mem);
349         else
350                 ret = ttm_bo_move_memcpy(bo, interruptible, no_wait_gpu, mem);
351
352         if (ret) {
353                 if (bdev->driver->move_notify) {
354                         struct ttm_mem_reg tmp_mem = *mem;
355                         *mem = bo->mem;
356                         bo->mem = tmp_mem;
357                         bdev->driver->move_notify(bo, false, mem);
358                         bo->mem = *mem;
359                         *mem = tmp_mem;
360                 }
361
362                 goto out_err;
363         }
364
365 moved:
366         if (bo->evicted) {
367                 if (bdev->driver->invalidate_caches) {
368                         ret = bdev->driver->invalidate_caches(bdev, bo->mem.placement);
369                         if (ret)
370                                 pr_err("Can not flush read caches\n");
371                 }
372                 bo->evicted = false;
373         }
374
375         if (bo->mem.mm_node) {
376                 bo->offset = (bo->mem.start << PAGE_SHIFT) +
377                     bdev->man[bo->mem.mem_type].gpu_offset;
378                 bo->cur_placement = bo->mem.placement;
379         } else
380                 bo->offset = 0;
381
382         return 0;
383
384 out_err:
385         new_man = &bdev->man[bo->mem.mem_type];
386         if (new_man->flags & TTM_MEMTYPE_FLAG_FIXED) {
387                 ttm_tt_destroy(bo->ttm);
388                 bo->ttm = NULL;
389         }
390
391         return ret;
392 }
393
394 /**
395  * Call bo::reserved.
396  * Will release GPU memory type usage on destruction.
397  * This is the place to put in driver specific hooks to release
398  * driver private resources.
399  * Will release the bo::reserved lock.
400  */
401
402 static void ttm_bo_cleanup_memtype_use(struct ttm_buffer_object *bo)
403 {
404         if (bo->bdev->driver->move_notify)
405                 bo->bdev->driver->move_notify(bo, false, NULL);
406
407         ttm_tt_destroy(bo->ttm);
408         bo->ttm = NULL;
409         ttm_bo_mem_put(bo, &bo->mem);
410
411         ww_mutex_unlock (&bo->resv->lock);
412 }
413
414 static void ttm_bo_flush_all_fences(struct ttm_buffer_object *bo)
415 {
416         struct reservation_object_list *fobj;
417         struct dma_fence *fence;
418         int i;
419
420         fobj = reservation_object_get_list(bo->resv);
421         fence = reservation_object_get_excl(bo->resv);
422         if (fence && !fence->ops->signaled)
423                 dma_fence_enable_sw_signaling(fence);
424
425         for (i = 0; fobj && i < fobj->shared_count; ++i) {
426                 fence = rcu_dereference_protected(fobj->shared[i],
427                                         reservation_object_held(bo->resv));
428
429                 if (!fence->ops->signaled)
430                         dma_fence_enable_sw_signaling(fence);
431         }
432 }
433
434 static void ttm_bo_cleanup_refs_or_queue(struct ttm_buffer_object *bo)
435 {
436         struct ttm_bo_device *bdev = bo->bdev;
437         struct ttm_bo_global *glob = bo->glob;
438         int put_count;
439         int ret;
440
441         spin_lock(&glob->lru_lock);
442         ret = __ttm_bo_reserve(bo, false, true, NULL);
443
444         if (!ret) {
445                 if (!ttm_bo_wait(bo, false, true)) {
446                         put_count = ttm_bo_del_from_lru(bo);
447
448                         spin_unlock(&glob->lru_lock);
449                         ttm_bo_cleanup_memtype_use(bo);
450
451                         ttm_bo_list_ref_sub(bo, put_count, true);
452
453                         return;
454                 } else
455                         ttm_bo_flush_all_fences(bo);
456
457                 /*
458                  * Make NO_EVICT bos immediately available to
459                  * shrinkers, now that they are queued for
460                  * destruction.
461                  */
462                 if (bo->mem.placement & TTM_PL_FLAG_NO_EVICT) {
463                         bo->mem.placement &= ~TTM_PL_FLAG_NO_EVICT;
464                         ttm_bo_add_to_lru(bo);
465                 }
466
467                 __ttm_bo_unreserve(bo);
468         }
469
470         kref_get(&bo->list_kref);
471         list_add_tail(&bo->ddestroy, &bdev->ddestroy);
472         spin_unlock(&glob->lru_lock);
473
474         schedule_delayed_work(&bdev->wq,
475                               ((HZ / 100) < 1) ? 1 : HZ / 100);
476 }
477
478 /**
479  * function ttm_bo_cleanup_refs_and_unlock
480  * If bo idle, remove from delayed- and lru lists, and unref.
481  * If not idle, do nothing.
482  *
483  * Must be called with lru_lock and reservation held, this function
484  * will drop both before returning.
485  *
486  * @interruptible         Any sleeps should occur interruptibly.
487  * @no_wait_gpu           Never wait for gpu. Return -EBUSY instead.
488  */
489
490 static int ttm_bo_cleanup_refs_and_unlock(struct ttm_buffer_object *bo,
491                                           bool interruptible,
492                                           bool no_wait_gpu)
493 {
494         struct ttm_bo_global *glob = bo->glob;
495         int put_count;
496         int ret;
497
498         ret = ttm_bo_wait(bo, false, true);
499
500         if (ret && !no_wait_gpu) {
501                 long lret;
502                 ww_mutex_unlock(&bo->resv->lock);
503                 spin_unlock(&glob->lru_lock);
504
505                 lret = reservation_object_wait_timeout_rcu(bo->resv,
506                                                            true,
507                                                            interruptible,
508                                                            30 * HZ);
509
510                 if (lret < 0)
511                         return lret;
512                 else if (lret == 0)
513                         return -EBUSY;
514
515                 spin_lock(&glob->lru_lock);
516                 ret = __ttm_bo_reserve(bo, false, true, NULL);
517
518                 /*
519                  * We raced, and lost, someone else holds the reservation now,
520                  * and is probably busy in ttm_bo_cleanup_memtype_use.
521                  *
522                  * Even if it's not the case, because we finished waiting any
523                  * delayed destruction would succeed, so just return success
524                  * here.
525                  */
526                 if (ret) {
527                         spin_unlock(&glob->lru_lock);
528                         return 0;
529                 }
530
531                 /*
532                  * remove sync_obj with ttm_bo_wait, the wait should be
533                  * finished, and no new wait object should have been added.
534                  */
535                 ret = ttm_bo_wait(bo, false, true);
536                 WARN_ON(ret);
537         }
538
539         if (ret || unlikely(list_empty(&bo->ddestroy))) {
540                 __ttm_bo_unreserve(bo);
541                 spin_unlock(&glob->lru_lock);
542                 return ret;
543         }
544
545         put_count = ttm_bo_del_from_lru(bo);
546         list_del_init(&bo->ddestroy);
547         ++put_count;
548
549         spin_unlock(&glob->lru_lock);
550         ttm_bo_cleanup_memtype_use(bo);
551
552         ttm_bo_list_ref_sub(bo, put_count, true);
553
554         return 0;
555 }
556
557 /**
558  * Traverse the delayed list, and call ttm_bo_cleanup_refs on all
559  * encountered buffers.
560  */
561
562 static int ttm_bo_delayed_delete(struct ttm_bo_device *bdev, bool remove_all)
563 {
564         struct ttm_bo_global *glob = bdev->glob;
565         struct ttm_buffer_object *entry = NULL;
566         int ret = 0;
567
568         spin_lock(&glob->lru_lock);
569         if (list_empty(&bdev->ddestroy))
570                 goto out_unlock;
571
572         entry = list_first_entry(&bdev->ddestroy,
573                 struct ttm_buffer_object, ddestroy);
574         kref_get(&entry->list_kref);
575
576         for (;;) {
577                 struct ttm_buffer_object *nentry = NULL;
578
579                 if (entry->ddestroy.next != &bdev->ddestroy) {
580                         nentry = list_first_entry(&entry->ddestroy,
581                                 struct ttm_buffer_object, ddestroy);
582                         kref_get(&nentry->list_kref);
583                 }
584
585                 ret = __ttm_bo_reserve(entry, false, true, NULL);
586                 if (remove_all && ret) {
587                         spin_unlock(&glob->lru_lock);
588                         ret = __ttm_bo_reserve(entry, false, false, NULL);
589                         spin_lock(&glob->lru_lock);
590                 }
591
592                 if (!ret)
593                         ret = ttm_bo_cleanup_refs_and_unlock(entry, false,
594                                                              !remove_all);
595                 else
596                         spin_unlock(&glob->lru_lock);
597
598                 kref_put(&entry->list_kref, ttm_bo_release_list);
599                 entry = nentry;
600
601                 if (ret || !entry)
602                         goto out;
603
604                 spin_lock(&glob->lru_lock);
605                 if (list_empty(&entry->ddestroy))
606                         break;
607         }
608
609 out_unlock:
610         spin_unlock(&glob->lru_lock);
611 out:
612         if (entry)
613                 kref_put(&entry->list_kref, ttm_bo_release_list);
614         return ret;
615 }
616
617 static void ttm_bo_delayed_workqueue(struct work_struct *work)
618 {
619         struct ttm_bo_device *bdev =
620             container_of(work, struct ttm_bo_device, wq.work);
621
622         if (ttm_bo_delayed_delete(bdev, false)) {
623                 schedule_delayed_work(&bdev->wq,
624                                       ((HZ / 100) < 1) ? 1 : HZ / 100);
625         }
626 }
627
628 static void ttm_bo_release(struct kref *kref)
629 {
630         struct ttm_buffer_object *bo =
631             container_of(kref, struct ttm_buffer_object, kref);
632         struct ttm_bo_device *bdev = bo->bdev;
633         struct ttm_mem_type_manager *man = &bdev->man[bo->mem.mem_type];
634
635         drm_vma_offset_remove(&bdev->vma_manager, &bo->vma_node);
636         ttm_mem_io_lock(man, false);
637         ttm_mem_io_free_vm(bo);
638         ttm_mem_io_unlock(man);
639         ttm_bo_cleanup_refs_or_queue(bo);
640         kref_put(&bo->list_kref, ttm_bo_release_list);
641 }
642
643 void ttm_bo_unref(struct ttm_buffer_object **p_bo)
644 {
645         struct ttm_buffer_object *bo = *p_bo;
646
647         *p_bo = NULL;
648         kref_put(&bo->kref, ttm_bo_release);
649 }
650 EXPORT_SYMBOL(ttm_bo_unref);
651
652 int ttm_bo_lock_delayed_workqueue(struct ttm_bo_device *bdev)
653 {
654         return cancel_delayed_work_sync(&bdev->wq);
655 }
656 EXPORT_SYMBOL(ttm_bo_lock_delayed_workqueue);
657
658 void ttm_bo_unlock_delayed_workqueue(struct ttm_bo_device *bdev, int resched)
659 {
660         if (resched)
661                 schedule_delayed_work(&bdev->wq,
662                                       ((HZ / 100) < 1) ? 1 : HZ / 100);
663 }
664 EXPORT_SYMBOL(ttm_bo_unlock_delayed_workqueue);
665
666 static int ttm_bo_evict(struct ttm_buffer_object *bo, bool interruptible,
667                         bool no_wait_gpu)
668 {
669         struct ttm_bo_device *bdev = bo->bdev;
670         struct ttm_mem_reg evict_mem;
671         struct ttm_placement placement;
672         int ret = 0;
673
674         lockdep_assert_held(&bo->resv->lock.base);
675
676         evict_mem = bo->mem;
677         evict_mem.mm_node = NULL;
678         evict_mem.bus.io_reserved_vm = false;
679         evict_mem.bus.io_reserved_count = 0;
680
681         placement.num_placement = 0;
682         placement.num_busy_placement = 0;
683         bdev->driver->evict_flags(bo, &placement);
684         ret = ttm_bo_mem_space(bo, &placement, &evict_mem, interruptible,
685                                 no_wait_gpu);
686         if (ret) {
687                 if (ret != -ERESTARTSYS) {
688                         pr_err("Failed to find memory space for buffer 0x%p eviction\n",
689                                bo);
690                         ttm_bo_mem_space_debug(bo, &placement);
691                 }
692                 goto out;
693         }
694
695         ret = ttm_bo_handle_move_mem(bo, &evict_mem, true, interruptible,
696                                      no_wait_gpu);
697         if (unlikely(ret)) {
698                 if (ret != -ERESTARTSYS)
699                         pr_err("Buffer eviction failed\n");
700                 ttm_bo_mem_put(bo, &evict_mem);
701                 goto out;
702         }
703         bo->evicted = true;
704 out:
705         return ret;
706 }
707
708 bool ttm_bo_eviction_valuable(struct ttm_buffer_object *bo,
709                               const struct ttm_place *place)
710 {
711         /* Don't evict this BO if it's outside of the
712          * requested placement range
713          */
714         if (place->fpfn >= (bo->mem.start + bo->mem.size) ||
715             (place->lpfn && place->lpfn <= bo->mem.start))
716                 return false;
717
718         return true;
719 }
720 EXPORT_SYMBOL(ttm_bo_eviction_valuable);
721
722 static int ttm_mem_evict_first(struct ttm_bo_device *bdev,
723                                 uint32_t mem_type,
724                                 const struct ttm_place *place,
725                                 bool interruptible,
726                                 bool no_wait_gpu)
727 {
728         struct ttm_bo_global *glob = bdev->glob;
729         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
730         struct ttm_buffer_object *bo;
731         int ret = -EBUSY, put_count;
732         unsigned i;
733
734         spin_lock(&glob->lru_lock);
735         for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i) {
736                 list_for_each_entry(bo, &man->lru[i], lru) {
737                         ret = __ttm_bo_reserve(bo, false, true, NULL);
738                         if (ret)
739                                 continue;
740
741                         if (place && !bdev->driver->eviction_valuable(bo,
742                                                                       place)) {
743                                 __ttm_bo_unreserve(bo);
744                                 ret = -EBUSY;
745                                 continue;
746                         }
747
748                         break;
749                 }
750
751                 if (!ret)
752                         break;
753         }
754
755         if (ret) {
756                 spin_unlock(&glob->lru_lock);
757                 return ret;
758         }
759
760         kref_get(&bo->list_kref);
761
762         if (!list_empty(&bo->ddestroy)) {
763                 ret = ttm_bo_cleanup_refs_and_unlock(bo, interruptible,
764                                                      no_wait_gpu);
765                 kref_put(&bo->list_kref, ttm_bo_release_list);
766                 return ret;
767         }
768
769         put_count = ttm_bo_del_from_lru(bo);
770         spin_unlock(&glob->lru_lock);
771
772         BUG_ON(ret != 0);
773
774         ttm_bo_list_ref_sub(bo, put_count, true);
775
776         ret = ttm_bo_evict(bo, interruptible, no_wait_gpu);
777         ttm_bo_unreserve(bo);
778
779         kref_put(&bo->list_kref, ttm_bo_release_list);
780         return ret;
781 }
782
783 void ttm_bo_mem_put(struct ttm_buffer_object *bo, struct ttm_mem_reg *mem)
784 {
785         struct ttm_mem_type_manager *man = &bo->bdev->man[mem->mem_type];
786
787         if (mem->mm_node)
788                 (*man->func->put_node)(man, mem);
789 }
790 EXPORT_SYMBOL(ttm_bo_mem_put);
791
792 /**
793  * Add the last move fence to the BO and reserve a new shared slot.
794  */
795 static int ttm_bo_add_move_fence(struct ttm_buffer_object *bo,
796                                  struct ttm_mem_type_manager *man,
797                                  struct ttm_mem_reg *mem)
798 {
799         struct dma_fence *fence;
800         int ret;
801
802         spin_lock(&man->move_lock);
803         fence = dma_fence_get(man->move);
804         spin_unlock(&man->move_lock);
805
806         if (fence) {
807                 reservation_object_add_shared_fence(bo->resv, fence);
808
809                 ret = reservation_object_reserve_shared(bo->resv);
810                 if (unlikely(ret))
811                         return ret;
812
813                 dma_fence_put(bo->moving);
814                 bo->moving = fence;
815         }
816
817         return 0;
818 }
819
820 /**
821  * Repeatedly evict memory from the LRU for @mem_type until we create enough
822  * space, or we've evicted everything and there isn't enough space.
823  */
824 static int ttm_bo_mem_force_space(struct ttm_buffer_object *bo,
825                                         uint32_t mem_type,
826                                         const struct ttm_place *place,
827                                         struct ttm_mem_reg *mem,
828                                         bool interruptible,
829                                         bool no_wait_gpu)
830 {
831         struct ttm_bo_device *bdev = bo->bdev;
832         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
833         int ret;
834
835         do {
836                 ret = (*man->func->get_node)(man, bo, place, mem);
837                 if (unlikely(ret != 0))
838                         return ret;
839                 if (mem->mm_node)
840                         break;
841                 ret = ttm_mem_evict_first(bdev, mem_type, place,
842                                           interruptible, no_wait_gpu);
843                 if (unlikely(ret != 0))
844                         return ret;
845         } while (1);
846         mem->mem_type = mem_type;
847         return ttm_bo_add_move_fence(bo, man, mem);
848 }
849
850 static uint32_t ttm_bo_select_caching(struct ttm_mem_type_manager *man,
851                                       uint32_t cur_placement,
852                                       uint32_t proposed_placement)
853 {
854         uint32_t caching = proposed_placement & TTM_PL_MASK_CACHING;
855         uint32_t result = proposed_placement & ~TTM_PL_MASK_CACHING;
856
857         /**
858          * Keep current caching if possible.
859          */
860
861         if ((cur_placement & caching) != 0)
862                 result |= (cur_placement & caching);
863         else if ((man->default_caching & caching) != 0)
864                 result |= man->default_caching;
865         else if ((TTM_PL_FLAG_CACHED & caching) != 0)
866                 result |= TTM_PL_FLAG_CACHED;
867         else if ((TTM_PL_FLAG_WC & caching) != 0)
868                 result |= TTM_PL_FLAG_WC;
869         else if ((TTM_PL_FLAG_UNCACHED & caching) != 0)
870                 result |= TTM_PL_FLAG_UNCACHED;
871
872         return result;
873 }
874
875 static bool ttm_bo_mt_compatible(struct ttm_mem_type_manager *man,
876                                  uint32_t mem_type,
877                                  const struct ttm_place *place,
878                                  uint32_t *masked_placement)
879 {
880         uint32_t cur_flags = ttm_bo_type_flags(mem_type);
881
882         if ((cur_flags & place->flags & TTM_PL_MASK_MEM) == 0)
883                 return false;
884
885         if ((place->flags & man->available_caching) == 0)
886                 return false;
887
888         cur_flags |= (place->flags & man->available_caching);
889
890         *masked_placement = cur_flags;
891         return true;
892 }
893
894 /**
895  * Creates space for memory region @mem according to its type.
896  *
897  * This function first searches for free space in compatible memory types in
898  * the priority order defined by the driver.  If free space isn't found, then
899  * ttm_bo_mem_force_space is attempted in priority order to evict and find
900  * space.
901  */
902 int ttm_bo_mem_space(struct ttm_buffer_object *bo,
903                         struct ttm_placement *placement,
904                         struct ttm_mem_reg *mem,
905                         bool interruptible,
906                         bool no_wait_gpu)
907 {
908         struct ttm_bo_device *bdev = bo->bdev;
909         struct ttm_mem_type_manager *man;
910         uint32_t mem_type = TTM_PL_SYSTEM;
911         uint32_t cur_flags = 0;
912         bool type_found = false;
913         bool type_ok = false;
914         bool has_erestartsys = false;
915         int i, ret;
916
917         ret = reservation_object_reserve_shared(bo->resv);
918         if (unlikely(ret))
919                 return ret;
920
921         mem->mm_node = NULL;
922         for (i = 0; i < placement->num_placement; ++i) {
923                 const struct ttm_place *place = &placement->placement[i];
924
925                 ret = ttm_mem_type_from_place(place, &mem_type);
926                 if (ret)
927                         return ret;
928                 man = &bdev->man[mem_type];
929                 if (!man->has_type || !man->use_type)
930                         continue;
931
932                 type_ok = ttm_bo_mt_compatible(man, mem_type, place,
933                                                 &cur_flags);
934
935                 if (!type_ok)
936                         continue;
937
938                 type_found = true;
939                 cur_flags = ttm_bo_select_caching(man, bo->mem.placement,
940                                                   cur_flags);
941                 /*
942                  * Use the access and other non-mapping-related flag bits from
943                  * the memory placement flags to the current flags
944                  */
945                 ttm_flag_masked(&cur_flags, place->flags,
946                                 ~TTM_PL_MASK_MEMTYPE);
947
948                 if (mem_type == TTM_PL_SYSTEM)
949                         break;
950
951                 ret = (*man->func->get_node)(man, bo, place, mem);
952                 if (unlikely(ret))
953                         return ret;
954
955                 if (mem->mm_node) {
956                         ret = ttm_bo_add_move_fence(bo, man, mem);
957                         if (unlikely(ret)) {
958                                 (*man->func->put_node)(man, mem);
959                                 return ret;
960                         }
961                         break;
962                 }
963         }
964
965         if ((type_ok && (mem_type == TTM_PL_SYSTEM)) || mem->mm_node) {
966                 mem->mem_type = mem_type;
967                 mem->placement = cur_flags;
968                 return 0;
969         }
970
971         for (i = 0; i < placement->num_busy_placement; ++i) {
972                 const struct ttm_place *place = &placement->busy_placement[i];
973
974                 ret = ttm_mem_type_from_place(place, &mem_type);
975                 if (ret)
976                         return ret;
977                 man = &bdev->man[mem_type];
978                 if (!man->has_type || !man->use_type)
979                         continue;
980                 if (!ttm_bo_mt_compatible(man, mem_type, place, &cur_flags))
981                         continue;
982
983                 type_found = true;
984                 cur_flags = ttm_bo_select_caching(man, bo->mem.placement,
985                                                   cur_flags);
986                 /*
987                  * Use the access and other non-mapping-related flag bits from
988                  * the memory placement flags to the current flags
989                  */
990                 ttm_flag_masked(&cur_flags, place->flags,
991                                 ~TTM_PL_MASK_MEMTYPE);
992
993                 if (mem_type == TTM_PL_SYSTEM) {
994                         mem->mem_type = mem_type;
995                         mem->placement = cur_flags;
996                         mem->mm_node = NULL;
997                         return 0;
998                 }
999
1000                 ret = ttm_bo_mem_force_space(bo, mem_type, place, mem,
1001                                                 interruptible, no_wait_gpu);
1002                 if (ret == 0 && mem->mm_node) {
1003                         mem->placement = cur_flags;
1004                         return 0;
1005                 }
1006                 if (ret == -ERESTARTSYS)
1007                         has_erestartsys = true;
1008         }
1009
1010         if (!type_found) {
1011                 printk(KERN_ERR TTM_PFX "No compatible memory type found.\n");
1012                 return -EINVAL;
1013         }
1014
1015         return (has_erestartsys) ? -ERESTARTSYS : -ENOMEM;
1016 }
1017 EXPORT_SYMBOL(ttm_bo_mem_space);
1018
1019 static int ttm_bo_move_buffer(struct ttm_buffer_object *bo,
1020                         struct ttm_placement *placement,
1021                         bool interruptible,
1022                         bool no_wait_gpu)
1023 {
1024         int ret = 0;
1025         struct ttm_mem_reg mem;
1026
1027         lockdep_assert_held(&bo->resv->lock.base);
1028
1029         mem.num_pages = bo->num_pages;
1030         mem.size = mem.num_pages << PAGE_SHIFT;
1031         mem.page_alignment = bo->mem.page_alignment;
1032         mem.bus.io_reserved_vm = false;
1033         mem.bus.io_reserved_count = 0;
1034         /*
1035          * Determine where to move the buffer.
1036          */
1037         ret = ttm_bo_mem_space(bo, placement, &mem,
1038                                interruptible, no_wait_gpu);
1039         if (ret)
1040                 goto out_unlock;
1041         ret = ttm_bo_handle_move_mem(bo, &mem, false,
1042                                      interruptible, no_wait_gpu);
1043 out_unlock:
1044         if (ret && mem.mm_node)
1045                 ttm_bo_mem_put(bo, &mem);
1046         return ret;
1047 }
1048
1049 bool ttm_bo_mem_compat(struct ttm_placement *placement,
1050                        struct ttm_mem_reg *mem,
1051                        uint32_t *new_flags)
1052 {
1053         int i;
1054
1055         for (i = 0; i < placement->num_placement; i++) {
1056                 const struct ttm_place *heap = &placement->placement[i];
1057                 if (mem->mm_node &&
1058                     (mem->start < heap->fpfn ||
1059                      (heap->lpfn != 0 && (mem->start + mem->num_pages) > heap->lpfn)))
1060                         continue;
1061
1062                 *new_flags = heap->flags;
1063                 if ((*new_flags & mem->placement & TTM_PL_MASK_CACHING) &&
1064                     (*new_flags & mem->placement & TTM_PL_MASK_MEM))
1065                         return true;
1066         }
1067
1068         for (i = 0; i < placement->num_busy_placement; i++) {
1069                 const struct ttm_place *heap = &placement->busy_placement[i];
1070                 if (mem->mm_node &&
1071                     (mem->start < heap->fpfn ||
1072                      (heap->lpfn != 0 && (mem->start + mem->num_pages) > heap->lpfn)))
1073                         continue;
1074
1075                 *new_flags = heap->flags;
1076                 if ((*new_flags & mem->placement & TTM_PL_MASK_CACHING) &&
1077                     (*new_flags & mem->placement & TTM_PL_MASK_MEM))
1078                         return true;
1079         }
1080
1081         return false;
1082 }
1083 EXPORT_SYMBOL(ttm_bo_mem_compat);
1084
1085 int ttm_bo_validate(struct ttm_buffer_object *bo,
1086                         struct ttm_placement *placement,
1087                         bool interruptible,
1088                         bool no_wait_gpu)
1089 {
1090         int ret;
1091         uint32_t new_flags;
1092
1093         lockdep_assert_held(&bo->resv->lock.base);
1094         /*
1095          * Check whether we need to move buffer.
1096          */
1097         if (!ttm_bo_mem_compat(placement, &bo->mem, &new_flags)) {
1098                 ret = ttm_bo_move_buffer(bo, placement, interruptible,
1099                                          no_wait_gpu);
1100                 if (ret)
1101                         return ret;
1102         } else {
1103                 /*
1104                  * Use the access and other non-mapping-related flag bits from
1105                  * the compatible memory placement flags to the active flags
1106                  */
1107                 ttm_flag_masked(&bo->mem.placement, new_flags,
1108                                 ~TTM_PL_MASK_MEMTYPE);
1109         }
1110         /*
1111          * We might need to add a TTM.
1112          */
1113         if (bo->mem.mem_type == TTM_PL_SYSTEM && bo->ttm == NULL) {
1114                 ret = ttm_bo_add_ttm(bo, true);
1115                 if (ret)
1116                         return ret;
1117         }
1118         return 0;
1119 }
1120 EXPORT_SYMBOL(ttm_bo_validate);
1121
1122 int ttm_bo_init(struct ttm_bo_device *bdev,
1123                 struct ttm_buffer_object *bo,
1124                 unsigned long size,
1125                 enum ttm_bo_type type,
1126                 struct ttm_placement *placement,
1127                 uint32_t page_alignment,
1128                 bool interruptible,
1129                 struct file *persistent_swap_storage,
1130                 size_t acc_size,
1131                 struct sg_table *sg,
1132                 struct reservation_object *resv,
1133                 void (*destroy) (struct ttm_buffer_object *))
1134 {
1135         int ret = 0;
1136         unsigned long num_pages;
1137         struct ttm_mem_global *mem_glob = bdev->glob->mem_glob;
1138         bool locked;
1139
1140         ret = ttm_mem_global_alloc(mem_glob, acc_size, false, false);
1141         if (ret) {
1142                 pr_err("Out of kernel memory\n");
1143                 if (destroy)
1144                         (*destroy)(bo);
1145                 else
1146                         kfree(bo);
1147                 return -ENOMEM;
1148         }
1149
1150         num_pages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
1151         if (num_pages == 0) {
1152                 pr_err("Illegal buffer object size\n");
1153                 if (destroy)
1154                         (*destroy)(bo);
1155                 else
1156                         kfree(bo);
1157                 ttm_mem_global_free(mem_glob, acc_size);
1158                 return -EINVAL;
1159         }
1160         bo->destroy = destroy;
1161
1162         kref_init(&bo->kref);
1163         kref_init(&bo->list_kref);
1164         atomic_set(&bo->cpu_writers, 0);
1165         INIT_LIST_HEAD(&bo->lru);
1166         INIT_LIST_HEAD(&bo->ddestroy);
1167         INIT_LIST_HEAD(&bo->swap);
1168         INIT_LIST_HEAD(&bo->io_reserve_lru);
1169         mutex_init(&bo->wu_mutex);
1170         bo->bdev = bdev;
1171         bo->glob = bdev->glob;
1172         bo->type = type;
1173         bo->num_pages = num_pages;
1174         bo->mem.size = num_pages << PAGE_SHIFT;
1175         bo->mem.mem_type = TTM_PL_SYSTEM;
1176         bo->mem.num_pages = bo->num_pages;
1177         bo->mem.mm_node = NULL;
1178         bo->mem.page_alignment = page_alignment;
1179         bo->mem.bus.io_reserved_vm = false;
1180         bo->mem.bus.io_reserved_count = 0;
1181         bo->moving = NULL;
1182         bo->mem.placement = (TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED);
1183         bo->persistent_swap_storage = persistent_swap_storage;
1184         bo->acc_size = acc_size;
1185         bo->sg = sg;
1186         if (resv) {
1187                 bo->resv = resv;
1188                 lockdep_assert_held(&bo->resv->lock.base);
1189         } else {
1190                 bo->resv = &bo->ttm_resv;
1191                 reservation_object_init(&bo->ttm_resv);
1192         }
1193         atomic_inc(&bo->glob->bo_count);
1194         drm_vma_node_reset(&bo->vma_node);
1195         bo->priority = 0;
1196
1197         /*
1198          * For ttm_bo_type_device buffers, allocate
1199          * address space from the device.
1200          */
1201         if (bo->type == ttm_bo_type_device ||
1202             bo->type == ttm_bo_type_sg)
1203                 ret = drm_vma_offset_add(&bdev->vma_manager, &bo->vma_node,
1204                                          bo->mem.num_pages);
1205
1206         /* passed reservation objects should already be locked,
1207          * since otherwise lockdep will be angered in radeon.
1208          */
1209         if (!resv) {
1210                 locked = ww_mutex_trylock(&bo->resv->lock);
1211                 WARN_ON(!locked);
1212         }
1213
1214         if (likely(!ret))
1215                 ret = ttm_bo_validate(bo, placement, interruptible, false);
1216
1217         if (!resv) {
1218                 ttm_bo_unreserve(bo);
1219
1220         } else if (!(bo->mem.placement & TTM_PL_FLAG_NO_EVICT)) {
1221                 spin_lock(&bo->glob->lru_lock);
1222                 ttm_bo_add_to_lru(bo);
1223                 spin_unlock(&bo->glob->lru_lock);
1224         }
1225
1226         if (unlikely(ret))
1227                 ttm_bo_unref(&bo);
1228
1229         return ret;
1230 }
1231 EXPORT_SYMBOL(ttm_bo_init);
1232
1233 size_t ttm_bo_acc_size(struct ttm_bo_device *bdev,
1234                        unsigned long bo_size,
1235                        unsigned struct_size)
1236 {
1237         unsigned npages = (PAGE_ALIGN(bo_size)) >> PAGE_SHIFT;
1238         size_t size = 0;
1239
1240         size += ttm_round_pot(struct_size);
1241         size += ttm_round_pot(npages * sizeof(void *));
1242         size += ttm_round_pot(sizeof(struct ttm_tt));
1243         return size;
1244 }
1245 EXPORT_SYMBOL(ttm_bo_acc_size);
1246
1247 size_t ttm_bo_dma_acc_size(struct ttm_bo_device *bdev,
1248                            unsigned long bo_size,
1249                            unsigned struct_size)
1250 {
1251         unsigned npages = (PAGE_ALIGN(bo_size)) >> PAGE_SHIFT;
1252         size_t size = 0;
1253
1254         size += ttm_round_pot(struct_size);
1255         size += ttm_round_pot(npages * (2*sizeof(void *) + sizeof(dma_addr_t)));
1256         size += ttm_round_pot(sizeof(struct ttm_dma_tt));
1257         return size;
1258 }
1259 EXPORT_SYMBOL(ttm_bo_dma_acc_size);
1260
1261 int ttm_bo_create(struct ttm_bo_device *bdev,
1262                         unsigned long size,
1263                         enum ttm_bo_type type,
1264                         struct ttm_placement *placement,
1265                         uint32_t page_alignment,
1266                         bool interruptible,
1267                         struct file *persistent_swap_storage,
1268                         struct ttm_buffer_object **p_bo)
1269 {
1270         struct ttm_buffer_object *bo;
1271         size_t acc_size;
1272         int ret;
1273
1274         bo = kzalloc(sizeof(*bo), GFP_KERNEL);
1275         if (unlikely(bo == NULL))
1276                 return -ENOMEM;
1277
1278         acc_size = ttm_bo_acc_size(bdev, size, sizeof(struct ttm_buffer_object));
1279         ret = ttm_bo_init(bdev, bo, size, type, placement, page_alignment,
1280                           interruptible, persistent_swap_storage, acc_size,
1281                           NULL, NULL, NULL);
1282         if (likely(ret == 0))
1283                 *p_bo = bo;
1284
1285         return ret;
1286 }
1287 EXPORT_SYMBOL(ttm_bo_create);
1288
1289 static int ttm_bo_force_list_clean(struct ttm_bo_device *bdev,
1290                                    unsigned mem_type)
1291 {
1292         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
1293         struct ttm_bo_global *glob = bdev->glob;
1294         struct dma_fence *fence;
1295         int ret;
1296         unsigned i;
1297
1298         /*
1299          * Can't use standard list traversal since we're unlocking.
1300          */
1301
1302         spin_lock(&glob->lru_lock);
1303         for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i) {
1304                 while (!list_empty(&man->lru[i])) {
1305                         spin_unlock(&glob->lru_lock);
1306                         ret = ttm_mem_evict_first(bdev, mem_type, NULL, false, false);
1307                         if (ret)
1308                                 return ret;
1309                         spin_lock(&glob->lru_lock);
1310                 }
1311         }
1312         spin_unlock(&glob->lru_lock);
1313
1314         spin_lock(&man->move_lock);
1315         fence = dma_fence_get(man->move);
1316         spin_unlock(&man->move_lock);
1317
1318         if (fence) {
1319                 ret = dma_fence_wait(fence, false);
1320                 dma_fence_put(fence);
1321                 if (ret)
1322                         return ret;
1323         }
1324
1325         return 0;
1326 }
1327
1328 int ttm_bo_clean_mm(struct ttm_bo_device *bdev, unsigned mem_type)
1329 {
1330         struct ttm_mem_type_manager *man;
1331         int ret = -EINVAL;
1332
1333         if (mem_type >= TTM_NUM_MEM_TYPES) {
1334                 pr_err("Illegal memory type %d\n", mem_type);
1335                 return ret;
1336         }
1337         man = &bdev->man[mem_type];
1338
1339         if (!man->has_type) {
1340                 pr_err("Trying to take down uninitialized memory manager type %u\n",
1341                        mem_type);
1342                 return ret;
1343         }
1344         dma_fence_put(man->move);
1345
1346         man->use_type = false;
1347         man->has_type = false;
1348
1349         ret = 0;
1350         if (mem_type > 0) {
1351                 ret = ttm_bo_force_list_clean(bdev, mem_type);
1352                 if (ret) {
1353                         pr_err("Cleanup eviction failed\n");
1354                         return ret;
1355                 }
1356
1357                 ret = (*man->func->takedown)(man);
1358         }
1359
1360         return ret;
1361 }
1362 EXPORT_SYMBOL(ttm_bo_clean_mm);
1363
1364 int ttm_bo_evict_mm(struct ttm_bo_device *bdev, unsigned mem_type)
1365 {
1366         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
1367
1368         if (mem_type == 0 || mem_type >= TTM_NUM_MEM_TYPES) {
1369                 pr_err("Illegal memory manager memory type %u\n", mem_type);
1370                 return -EINVAL;
1371         }
1372
1373         if (!man->has_type) {
1374                 pr_err("Memory type %u has not been initialized\n", mem_type);
1375                 return 0;
1376         }
1377
1378         return ttm_bo_force_list_clean(bdev, mem_type);
1379 }
1380 EXPORT_SYMBOL(ttm_bo_evict_mm);
1381
1382 int ttm_bo_init_mm(struct ttm_bo_device *bdev, unsigned type,
1383                         unsigned long p_size)
1384 {
1385         int ret = -EINVAL;
1386         struct ttm_mem_type_manager *man;
1387         unsigned i;
1388
1389         BUG_ON(type >= TTM_NUM_MEM_TYPES);
1390         man = &bdev->man[type];
1391         BUG_ON(man->has_type);
1392         man->io_reserve_fastpath = true;
1393         man->use_io_reserve_lru = false;
1394         mutex_init(&man->io_reserve_mutex);
1395         spin_lock_init(&man->move_lock);
1396         INIT_LIST_HEAD(&man->io_reserve_lru);
1397
1398         ret = bdev->driver->init_mem_type(bdev, type, man);
1399         if (ret)
1400                 return ret;
1401         man->bdev = bdev;
1402
1403         ret = 0;
1404         if (type != TTM_PL_SYSTEM) {
1405                 ret = (*man->func->init)(man, p_size);
1406                 if (ret)
1407                         return ret;
1408         }
1409         man->has_type = true;
1410         man->use_type = true;
1411         man->size = p_size;
1412
1413         for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i)
1414                 INIT_LIST_HEAD(&man->lru[i]);
1415         man->move = NULL;
1416
1417         return 0;
1418 }
1419 EXPORT_SYMBOL(ttm_bo_init_mm);
1420
1421 static void ttm_bo_global_kobj_release(struct kobject *kobj)
1422 {
1423         struct ttm_bo_global *glob =
1424                 container_of(kobj, struct ttm_bo_global, kobj);
1425
1426         ttm_mem_unregister_shrink(glob->mem_glob, &glob->shrink);
1427         __free_page(glob->dummy_read_page);
1428         kfree(glob);
1429 }
1430
1431 void ttm_bo_global_release(struct drm_global_reference *ref)
1432 {
1433         struct ttm_bo_global *glob = ref->object;
1434
1435         kobject_del(&glob->kobj);
1436         kobject_put(&glob->kobj);
1437 }
1438 EXPORT_SYMBOL(ttm_bo_global_release);
1439
1440 int ttm_bo_global_init(struct drm_global_reference *ref)
1441 {
1442         struct ttm_bo_global_ref *bo_ref =
1443                 container_of(ref, struct ttm_bo_global_ref, ref);
1444         struct ttm_bo_global *glob = ref->object;
1445         int ret;
1446         unsigned i;
1447
1448         mutex_init(&glob->device_list_mutex);
1449         spin_lock_init(&glob->lru_lock);
1450         glob->mem_glob = bo_ref->mem_glob;
1451         glob->dummy_read_page = alloc_page(__GFP_ZERO | GFP_DMA32);
1452
1453         if (unlikely(glob->dummy_read_page == NULL)) {
1454                 ret = -ENOMEM;
1455                 goto out_no_drp;
1456         }
1457
1458         for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i)
1459                 INIT_LIST_HEAD(&glob->swap_lru[i]);
1460         INIT_LIST_HEAD(&glob->device_list);
1461
1462         ttm_mem_init_shrink(&glob->shrink, ttm_bo_swapout);
1463         ret = ttm_mem_register_shrink(glob->mem_glob, &glob->shrink);
1464         if (unlikely(ret != 0)) {
1465                 pr_err("Could not register buffer object swapout\n");
1466                 goto out_no_shrink;
1467         }
1468
1469         atomic_set(&glob->bo_count, 0);
1470
1471         ret = kobject_init_and_add(
1472                 &glob->kobj, &ttm_bo_glob_kobj_type, ttm_get_kobj(), "buffer_objects");
1473         if (unlikely(ret != 0))
1474                 kobject_put(&glob->kobj);
1475         return ret;
1476 out_no_shrink:
1477         __free_page(glob->dummy_read_page);
1478 out_no_drp:
1479         kfree(glob);
1480         return ret;
1481 }
1482 EXPORT_SYMBOL(ttm_bo_global_init);
1483
1484
1485 int ttm_bo_device_release(struct ttm_bo_device *bdev)
1486 {
1487         int ret = 0;
1488         unsigned i = TTM_NUM_MEM_TYPES;
1489         struct ttm_mem_type_manager *man;
1490         struct ttm_bo_global *glob = bdev->glob;
1491
1492         while (i--) {
1493                 man = &bdev->man[i];
1494                 if (man->has_type) {
1495                         man->use_type = false;
1496                         if ((i != TTM_PL_SYSTEM) && ttm_bo_clean_mm(bdev, i)) {
1497                                 ret = -EBUSY;
1498                                 pr_err("DRM memory manager type %d is not clean\n",
1499                                        i);
1500                         }
1501                         man->has_type = false;
1502                 }
1503         }
1504
1505         mutex_lock(&glob->device_list_mutex);
1506         list_del(&bdev->device_list);
1507         mutex_unlock(&glob->device_list_mutex);
1508
1509         cancel_delayed_work_sync(&bdev->wq);
1510
1511         while (ttm_bo_delayed_delete(bdev, true))
1512                 ;
1513
1514         spin_lock(&glob->lru_lock);
1515         if (list_empty(&bdev->ddestroy))
1516                 TTM_DEBUG("Delayed destroy list was clean\n");
1517
1518         for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i)
1519                 if (list_empty(&bdev->man[0].lru[0]))
1520                         TTM_DEBUG("Swap list %d was clean\n", i);
1521         spin_unlock(&glob->lru_lock);
1522
1523         drm_vma_offset_manager_destroy(&bdev->vma_manager);
1524
1525         return ret;
1526 }
1527 EXPORT_SYMBOL(ttm_bo_device_release);
1528
1529 int ttm_bo_device_init(struct ttm_bo_device *bdev,
1530                        struct ttm_bo_global *glob,
1531                        struct ttm_bo_driver *driver,
1532                        struct address_space *mapping,
1533                        uint64_t file_page_offset,
1534                        bool need_dma32)
1535 {
1536         int ret = -EINVAL;
1537
1538         bdev->driver = driver;
1539
1540         memset(bdev->man, 0, sizeof(bdev->man));
1541
1542         /*
1543          * Initialize the system memory buffer type.
1544          * Other types need to be driver / IOCTL initialized.
1545          */
1546         ret = ttm_bo_init_mm(bdev, TTM_PL_SYSTEM, 0);
1547         if (unlikely(ret != 0))
1548                 goto out_no_sys;
1549
1550         drm_vma_offset_manager_init(&bdev->vma_manager, file_page_offset,
1551                                     0x10000000);
1552         INIT_DELAYED_WORK(&bdev->wq, ttm_bo_delayed_workqueue);
1553         INIT_LIST_HEAD(&bdev->ddestroy);
1554         bdev->dev_mapping = mapping;
1555         bdev->glob = glob;
1556         bdev->need_dma32 = need_dma32;
1557         mutex_lock(&glob->device_list_mutex);
1558         list_add_tail(&bdev->device_list, &glob->device_list);
1559         mutex_unlock(&glob->device_list_mutex);
1560
1561         return 0;
1562 out_no_sys:
1563         return ret;
1564 }
1565 EXPORT_SYMBOL(ttm_bo_device_init);
1566
1567 /*
1568  * buffer object vm functions.
1569  */
1570
1571 bool ttm_mem_reg_is_pci(struct ttm_bo_device *bdev, struct ttm_mem_reg *mem)
1572 {
1573         struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
1574
1575         if (!(man->flags & TTM_MEMTYPE_FLAG_FIXED)) {
1576                 if (mem->mem_type == TTM_PL_SYSTEM)
1577                         return false;
1578
1579                 if (man->flags & TTM_MEMTYPE_FLAG_CMA)
1580                         return false;
1581
1582                 if (mem->placement & TTM_PL_FLAG_CACHED)
1583                         return false;
1584         }
1585         return true;
1586 }
1587
1588 void ttm_bo_unmap_virtual_locked(struct ttm_buffer_object *bo)
1589 {
1590         struct ttm_bo_device *bdev = bo->bdev;
1591
1592         drm_vma_node_unmap(&bo->vma_node, bdev->dev_mapping);
1593         ttm_mem_io_free_vm(bo);
1594 }
1595
1596 void ttm_bo_unmap_virtual(struct ttm_buffer_object *bo)
1597 {
1598         struct ttm_bo_device *bdev = bo->bdev;
1599         struct ttm_mem_type_manager *man = &bdev->man[bo->mem.mem_type];
1600
1601         ttm_mem_io_lock(man, false);
1602         ttm_bo_unmap_virtual_locked(bo);
1603         ttm_mem_io_unlock(man);
1604 }
1605
1606
1607 EXPORT_SYMBOL(ttm_bo_unmap_virtual);
1608
1609 int ttm_bo_wait(struct ttm_buffer_object *bo,
1610                 bool interruptible, bool no_wait)
1611 {
1612         long timeout = 15 * HZ;
1613
1614         if (no_wait) {
1615                 if (reservation_object_test_signaled_rcu(bo->resv, true))
1616                         return 0;
1617                 else
1618                         return -EBUSY;
1619         }
1620
1621         timeout = reservation_object_wait_timeout_rcu(bo->resv, true,
1622                                                       interruptible, timeout);
1623         if (timeout < 0)
1624                 return timeout;
1625
1626         if (timeout == 0)
1627                 return -EBUSY;
1628
1629         reservation_object_add_excl_fence(bo->resv, NULL);
1630         return 0;
1631 }
1632 EXPORT_SYMBOL(ttm_bo_wait);
1633
1634 int ttm_bo_synccpu_write_grab(struct ttm_buffer_object *bo, bool no_wait)
1635 {
1636         int ret = 0;
1637
1638         /*
1639          * Using ttm_bo_reserve makes sure the lru lists are updated.
1640          */
1641
1642         ret = ttm_bo_reserve(bo, true, no_wait, NULL);
1643         if (unlikely(ret != 0))
1644                 return ret;
1645         ret = ttm_bo_wait(bo, true, no_wait);
1646         if (likely(ret == 0))
1647                 atomic_inc(&bo->cpu_writers);
1648         ttm_bo_unreserve(bo);
1649         return ret;
1650 }
1651 EXPORT_SYMBOL(ttm_bo_synccpu_write_grab);
1652
1653 void ttm_bo_synccpu_write_release(struct ttm_buffer_object *bo)
1654 {
1655         atomic_dec(&bo->cpu_writers);
1656 }
1657 EXPORT_SYMBOL(ttm_bo_synccpu_write_release);
1658
1659 /**
1660  * A buffer object shrink method that tries to swap out the first
1661  * buffer object on the bo_global::swap_lru list.
1662  */
1663
1664 static int ttm_bo_swapout(struct ttm_mem_shrink *shrink)
1665 {
1666         struct ttm_bo_global *glob =
1667             container_of(shrink, struct ttm_bo_global, shrink);
1668         struct ttm_buffer_object *bo;
1669         int ret = -EBUSY;
1670         int put_count;
1671         unsigned i;
1672
1673         spin_lock(&glob->lru_lock);
1674         for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i) {
1675                 list_for_each_entry(bo, &glob->swap_lru[i], swap) {
1676                         ret = __ttm_bo_reserve(bo, false, true, NULL);
1677                         if (!ret)
1678                                 break;
1679                 }
1680                 if (!ret)
1681                         break;
1682         }
1683
1684         if (ret) {
1685                 spin_unlock(&glob->lru_lock);
1686                 return ret;
1687         }
1688
1689         kref_get(&bo->list_kref);
1690
1691         if (!list_empty(&bo->ddestroy)) {
1692                 ret = ttm_bo_cleanup_refs_and_unlock(bo, false, false);
1693                 kref_put(&bo->list_kref, ttm_bo_release_list);
1694                 return ret;
1695         }
1696
1697         put_count = ttm_bo_del_from_lru(bo);
1698         spin_unlock(&glob->lru_lock);
1699
1700         ttm_bo_list_ref_sub(bo, put_count, true);
1701
1702         /**
1703          * Move to system cached
1704          */
1705
1706         if (bo->mem.mem_type != TTM_PL_SYSTEM ||
1707             bo->ttm->caching_state != tt_cached) {
1708                 struct ttm_mem_reg evict_mem;
1709
1710                 evict_mem = bo->mem;
1711                 evict_mem.mm_node = NULL;
1712                 evict_mem.placement = TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED;
1713                 evict_mem.mem_type = TTM_PL_SYSTEM;
1714
1715                 ret = ttm_bo_handle_move_mem(bo, &evict_mem, true,
1716                                              false, false);
1717                 if (unlikely(ret != 0))
1718                         goto out;
1719         }
1720
1721         /**
1722          * Make sure BO is idle.
1723          */
1724
1725         ret = ttm_bo_wait(bo, false, false);
1726         if (unlikely(ret != 0))
1727                 goto out;
1728
1729         ttm_bo_unmap_virtual(bo);
1730
1731         /**
1732          * Swap out. Buffer will be swapped in again as soon as
1733          * anyone tries to access a ttm page.
1734          */
1735
1736         if (bo->bdev->driver->swap_notify)
1737                 bo->bdev->driver->swap_notify(bo);
1738
1739         ret = ttm_tt_swapout(bo->ttm, bo->persistent_swap_storage);
1740 out:
1741
1742         /**
1743          *
1744          * Unreserve without putting on LRU to avoid swapping out an
1745          * already swapped buffer.
1746          */
1747
1748         __ttm_bo_unreserve(bo);
1749         kref_put(&bo->list_kref, ttm_bo_release_list);
1750         return ret;
1751 }
1752
1753 void ttm_bo_swapout_all(struct ttm_bo_device *bdev)
1754 {
1755         while (ttm_bo_swapout(&bdev->glob->shrink) == 0)
1756                 ;
1757 }
1758 EXPORT_SYMBOL(ttm_bo_swapout_all);
1759
1760 /**
1761  * ttm_bo_wait_unreserved - interruptible wait for a buffer object to become
1762  * unreserved
1763  *
1764  * @bo: Pointer to buffer
1765  */
1766 int ttm_bo_wait_unreserved(struct ttm_buffer_object *bo)
1767 {
1768         int ret;
1769
1770         /*
1771          * In the absense of a wait_unlocked API,
1772          * Use the bo::wu_mutex to avoid triggering livelocks due to
1773          * concurrent use of this function. Note that this use of
1774          * bo::wu_mutex can go away if we change locking order to
1775          * mmap_sem -> bo::reserve.
1776          */
1777         ret = mutex_lock_interruptible(&bo->wu_mutex);
1778         if (unlikely(ret != 0))
1779                 return -ERESTARTSYS;
1780         if (!ww_mutex_is_locked(&bo->resv->lock))
1781                 goto out_unlock;
1782         ret = __ttm_bo_reserve(bo, true, false, NULL);
1783         if (unlikely(ret != 0))
1784                 goto out_unlock;
1785         __ttm_bo_unreserve(bo);
1786
1787 out_unlock:
1788         mutex_unlock(&bo->wu_mutex);
1789         return ret;
1790 }