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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
49static int ttm_bo_swapout(struct ttm_mem_shrink *shrink);
50static void ttm_bo_global_kobj_release(struct kobject *kobj);
51
52static struct attribute ttm_bo_count = {
53 .name = "bo_count",
54 .mode = S_IRUGO
55};
56
57static 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
70static 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
85static 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
104static 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
115static struct attribute *ttm_bo_global_attrs[] = {
116 &ttm_bo_count,
117 NULL
118};
119
120static const struct sysfs_ops ttm_bo_global_ops = {
121 .show = &ttm_bo_global_show
122};
123
124static 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
131static inline uint32_t ttm_bo_type_flags(unsigned type)
132{
133 return 1 << (type);
134}
135
136static 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
150 if (bo->ttm)
151 ttm_tt_destroy(bo->ttm);
152 atomic_dec(&bo->glob->bo_count);
153 if (bo->resv == &bo->ttm_resv)
154 reservation_object_fini(&bo->ttm_resv);
155 mutex_destroy(&bo->wu_mutex);
156 if (bo->destroy)
157 bo->destroy(bo);
158 else {
159 kfree(bo);
160 }
161 ttm_mem_global_free(bdev->glob->mem_glob, acc_size);
162}
163
164void ttm_bo_add_to_lru(struct ttm_buffer_object *bo)
165{
166 struct ttm_bo_device *bdev = bo->bdev;
167 struct ttm_mem_type_manager *man;
168
169 lockdep_assert_held(&bo->resv->lock.base);
170
171 if (!(bo->mem.placement & TTM_PL_FLAG_NO_EVICT)) {
172
173 BUG_ON(!list_empty(&bo->lru));
174
175 man = &bdev->man[bo->mem.mem_type];
176 list_add_tail(&bo->lru, &man->lru);
177 kref_get(&bo->list_kref);
178
179 if (bo->ttm && !(bo->ttm->page_flags & TTM_PAGE_FLAG_SG)) {
180 list_add_tail(&bo->swap, &bo->glob->swap_lru);
181 kref_get(&bo->list_kref);
182 }
183 }
184}
185EXPORT_SYMBOL(ttm_bo_add_to_lru);
186
187int 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
208static void ttm_bo_ref_bug(struct kref *list_kref)
209{
210 BUG();
211}
212
213void 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
220void 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}
229EXPORT_SYMBOL(ttm_bo_del_sub_from_lru);
230
231void 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}
241EXPORT_SYMBOL(ttm_bo_move_to_lru_tail);
242
243/*
244 * Call bo->mutex locked.
245 */
246static 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
288static 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, 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, 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, evict, 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, evict, 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, mem);
358 bo->mem = *mem;
359 *mem = tmp_mem;
360 }
361
362 goto out_err;
363 }
364
365moved:
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
384out_err:
385 new_man = &bdev->man[bo->mem.mem_type];
386 if ((new_man->flags & TTM_MEMTYPE_FLAG_FIXED) && bo->ttm) {
387 ttm_tt_unbind(bo->ttm);
388 ttm_tt_destroy(bo->ttm);
389 bo->ttm = NULL;
390 }
391
392 return ret;
393}
394
395/**
396 * Call bo::reserved.
397 * Will release GPU memory type usage on destruction.
398 * This is the place to put in driver specific hooks to release
399 * driver private resources.
400 * Will release the bo::reserved lock.
401 */
402
403static void ttm_bo_cleanup_memtype_use(struct ttm_buffer_object *bo)
404{
405 if (bo->bdev->driver->move_notify)
406 bo->bdev->driver->move_notify(bo, NULL);
407
408 if (bo->ttm) {
409 ttm_tt_unbind(bo->ttm);
410 ttm_tt_destroy(bo->ttm);
411 bo->ttm = NULL;
412 }
413 ttm_bo_mem_put(bo, &bo->mem);
414
415 ww_mutex_unlock (&bo->resv->lock);
416}
417
418static void ttm_bo_flush_all_fences(struct ttm_buffer_object *bo)
419{
420 struct reservation_object_list *fobj;
421 struct fence *fence;
422 int i;
423
424 fobj = reservation_object_get_list(bo->resv);
425 fence = reservation_object_get_excl(bo->resv);
426 if (fence && !fence->ops->signaled)
427 fence_enable_sw_signaling(fence);
428
429 for (i = 0; fobj && i < fobj->shared_count; ++i) {
430 fence = rcu_dereference_protected(fobj->shared[i],
431 reservation_object_held(bo->resv));
432
433 if (!fence->ops->signaled)
434 fence_enable_sw_signaling(fence);
435 }
436}
437
438static void ttm_bo_cleanup_refs_or_queue(struct ttm_buffer_object *bo)
439{
440 struct ttm_bo_device *bdev = bo->bdev;
441 struct ttm_bo_global *glob = bo->glob;
442 int put_count;
443 int ret;
444
445 spin_lock(&glob->lru_lock);
446 ret = __ttm_bo_reserve(bo, false, true, false, NULL);
447
448 if (!ret) {
449 if (!ttm_bo_wait(bo, false, false, true)) {
450 put_count = ttm_bo_del_from_lru(bo);
451
452 spin_unlock(&glob->lru_lock);
453 ttm_bo_cleanup_memtype_use(bo);
454
455 ttm_bo_list_ref_sub(bo, put_count, true);
456
457 return;
458 } else
459 ttm_bo_flush_all_fences(bo);
460
461 /*
462 * Make NO_EVICT bos immediately available to
463 * shrinkers, now that they are queued for
464 * destruction.
465 */
466 if (bo->mem.placement & TTM_PL_FLAG_NO_EVICT) {
467 bo->mem.placement &= ~TTM_PL_FLAG_NO_EVICT;
468 ttm_bo_add_to_lru(bo);
469 }
470
471 __ttm_bo_unreserve(bo);
472 }
473
474 kref_get(&bo->list_kref);
475 list_add_tail(&bo->ddestroy, &bdev->ddestroy);
476 spin_unlock(&glob->lru_lock);
477
478 schedule_delayed_work(&bdev->wq,
479 ((HZ / 100) < 1) ? 1 : HZ / 100);
480}
481
482/**
483 * function ttm_bo_cleanup_refs_and_unlock
484 * If bo idle, remove from delayed- and lru lists, and unref.
485 * If not idle, do nothing.
486 *
487 * Must be called with lru_lock and reservation held, this function
488 * will drop both before returning.
489 *
490 * @interruptible Any sleeps should occur interruptibly.
491 * @no_wait_gpu Never wait for gpu. Return -EBUSY instead.
492 */
493
494static int ttm_bo_cleanup_refs_and_unlock(struct ttm_buffer_object *bo,
495 bool interruptible,
496 bool no_wait_gpu)
497{
498 struct ttm_bo_global *glob = bo->glob;
499 int put_count;
500 int ret;
501
502 ret = ttm_bo_wait(bo, false, false, true);
503
504 if (ret && !no_wait_gpu) {
505 long lret;
506 ww_mutex_unlock(&bo->resv->lock);
507 spin_unlock(&glob->lru_lock);
508
509 lret = reservation_object_wait_timeout_rcu(bo->resv,
510 true,
511 interruptible,
512 30 * HZ);
513
514 if (lret < 0)
515 return lret;
516 else if (lret == 0)
517 return -EBUSY;
518
519 spin_lock(&glob->lru_lock);
520 ret = __ttm_bo_reserve(bo, false, true, false, NULL);
521
522 /*
523 * We raced, and lost, someone else holds the reservation now,
524 * and is probably busy in ttm_bo_cleanup_memtype_use.
525 *
526 * Even if it's not the case, because we finished waiting any
527 * delayed destruction would succeed, so just return success
528 * here.
529 */
530 if (ret) {
531 spin_unlock(&glob->lru_lock);
532 return 0;
533 }
534
535 /*
536 * remove sync_obj with ttm_bo_wait, the wait should be
537 * finished, and no new wait object should have been added.
538 */
539 ret = ttm_bo_wait(bo, false, false, true);
540 WARN_ON(ret);
541 }
542
543 if (ret || unlikely(list_empty(&bo->ddestroy))) {
544 __ttm_bo_unreserve(bo);
545 spin_unlock(&glob->lru_lock);
546 return ret;
547 }
548
549 put_count = ttm_bo_del_from_lru(bo);
550 list_del_init(&bo->ddestroy);
551 ++put_count;
552
553 spin_unlock(&glob->lru_lock);
554 ttm_bo_cleanup_memtype_use(bo);
555
556 ttm_bo_list_ref_sub(bo, put_count, true);
557
558 return 0;
559}
560
561/**
562 * Traverse the delayed list, and call ttm_bo_cleanup_refs on all
563 * encountered buffers.
564 */
565
566static int ttm_bo_delayed_delete(struct ttm_bo_device *bdev, bool remove_all)
567{
568 struct ttm_bo_global *glob = bdev->glob;
569 struct ttm_buffer_object *entry = NULL;
570 int ret = 0;
571
572 spin_lock(&glob->lru_lock);
573 if (list_empty(&bdev->ddestroy))
574 goto out_unlock;
575
576 entry = list_first_entry(&bdev->ddestroy,
577 struct ttm_buffer_object, ddestroy);
578 kref_get(&entry->list_kref);
579
580 for (;;) {
581 struct ttm_buffer_object *nentry = NULL;
582
583 if (entry->ddestroy.next != &bdev->ddestroy) {
584 nentry = list_first_entry(&entry->ddestroy,
585 struct ttm_buffer_object, ddestroy);
586 kref_get(&nentry->list_kref);
587 }
588
589 ret = __ttm_bo_reserve(entry, false, true, false, NULL);
590 if (remove_all && ret) {
591 spin_unlock(&glob->lru_lock);
592 ret = __ttm_bo_reserve(entry, false, false,
593 false, NULL);
594 spin_lock(&glob->lru_lock);
595 }
596
597 if (!ret)
598 ret = ttm_bo_cleanup_refs_and_unlock(entry, false,
599 !remove_all);
600 else
601 spin_unlock(&glob->lru_lock);
602
603 kref_put(&entry->list_kref, ttm_bo_release_list);
604 entry = nentry;
605
606 if (ret || !entry)
607 goto out;
608
609 spin_lock(&glob->lru_lock);
610 if (list_empty(&entry->ddestroy))
611 break;
612 }
613
614out_unlock:
615 spin_unlock(&glob->lru_lock);
616out:
617 if (entry)
618 kref_put(&entry->list_kref, ttm_bo_release_list);
619 return ret;
620}
621
622static void ttm_bo_delayed_workqueue(struct work_struct *work)
623{
624 struct ttm_bo_device *bdev =
625 container_of(work, struct ttm_bo_device, wq.work);
626
627 if (ttm_bo_delayed_delete(bdev, false)) {
628 schedule_delayed_work(&bdev->wq,
629 ((HZ / 100) < 1) ? 1 : HZ / 100);
630 }
631}
632
633static void ttm_bo_release(struct kref *kref)
634{
635 struct ttm_buffer_object *bo =
636 container_of(kref, struct ttm_buffer_object, kref);
637 struct ttm_bo_device *bdev = bo->bdev;
638 struct ttm_mem_type_manager *man = &bdev->man[bo->mem.mem_type];
639
640 drm_vma_offset_remove(&bdev->vma_manager, &bo->vma_node);
641 ttm_mem_io_lock(man, false);
642 ttm_mem_io_free_vm(bo);
643 ttm_mem_io_unlock(man);
644 ttm_bo_cleanup_refs_or_queue(bo);
645 kref_put(&bo->list_kref, ttm_bo_release_list);
646}
647
648void ttm_bo_unref(struct ttm_buffer_object **p_bo)
649{
650 struct ttm_buffer_object *bo = *p_bo;
651
652 *p_bo = NULL;
653 kref_put(&bo->kref, ttm_bo_release);
654}
655EXPORT_SYMBOL(ttm_bo_unref);
656
657int ttm_bo_lock_delayed_workqueue(struct ttm_bo_device *bdev)
658{
659 return cancel_delayed_work_sync(&bdev->wq);
660}
661EXPORT_SYMBOL(ttm_bo_lock_delayed_workqueue);
662
663void ttm_bo_unlock_delayed_workqueue(struct ttm_bo_device *bdev, int resched)
664{
665 if (resched)
666 schedule_delayed_work(&bdev->wq,
667 ((HZ / 100) < 1) ? 1 : HZ / 100);
668}
669EXPORT_SYMBOL(ttm_bo_unlock_delayed_workqueue);
670
671static int ttm_bo_evict(struct ttm_buffer_object *bo, bool interruptible,
672 bool no_wait_gpu)
673{
674 struct ttm_bo_device *bdev = bo->bdev;
675 struct ttm_mem_reg evict_mem;
676 struct ttm_placement placement;
677 int ret = 0;
678
679 ret = ttm_bo_wait(bo, false, interruptible, no_wait_gpu);
680
681 if (unlikely(ret != 0)) {
682 if (ret != -ERESTARTSYS) {
683 pr_err("Failed to expire sync object before buffer eviction\n");
684 }
685 goto out;
686 }
687
688 lockdep_assert_held(&bo->resv->lock.base);
689
690 evict_mem = bo->mem;
691 evict_mem.mm_node = NULL;
692 evict_mem.bus.io_reserved_vm = false;
693 evict_mem.bus.io_reserved_count = 0;
694
695 placement.num_placement = 0;
696 placement.num_busy_placement = 0;
697 bdev->driver->evict_flags(bo, &placement);
698 ret = ttm_bo_mem_space(bo, &placement, &evict_mem, interruptible,
699 no_wait_gpu);
700 if (ret) {
701 if (ret != -ERESTARTSYS) {
702 pr_err("Failed to find memory space for buffer 0x%p eviction\n",
703 bo);
704 ttm_bo_mem_space_debug(bo, &placement);
705 }
706 goto out;
707 }
708
709 ret = ttm_bo_handle_move_mem(bo, &evict_mem, true, interruptible,
710 no_wait_gpu);
711 if (ret) {
712 if (ret != -ERESTARTSYS)
713 pr_err("Buffer eviction failed\n");
714 ttm_bo_mem_put(bo, &evict_mem);
715 goto out;
716 }
717 bo->evicted = true;
718out:
719 return ret;
720}
721
722static 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
733 spin_lock(&glob->lru_lock);
734 list_for_each_entry(bo, &man->lru, lru) {
735 ret = __ttm_bo_reserve(bo, false, true, false, NULL);
736 if (!ret) {
737 if (place && (place->fpfn || place->lpfn)) {
738 /* Don't evict this BO if it's outside of the
739 * requested placement range
740 */
741 if (place->fpfn >= (bo->mem.start + bo->mem.size) ||
742 (place->lpfn && place->lpfn <= bo->mem.start)) {
743 __ttm_bo_unreserve(bo);
744 ret = -EBUSY;
745 continue;
746 }
747 }
748
749 break;
750 }
751 }
752
753 if (ret) {
754 spin_unlock(&glob->lru_lock);
755 return ret;
756 }
757
758 kref_get(&bo->list_kref);
759
760 if (!list_empty(&bo->ddestroy)) {
761 ret = ttm_bo_cleanup_refs_and_unlock(bo, interruptible,
762 no_wait_gpu);
763 kref_put(&bo->list_kref, ttm_bo_release_list);
764 return ret;
765 }
766
767 put_count = ttm_bo_del_from_lru(bo);
768 spin_unlock(&glob->lru_lock);
769
770 BUG_ON(ret != 0);
771
772 ttm_bo_list_ref_sub(bo, put_count, true);
773
774 ret = ttm_bo_evict(bo, interruptible, no_wait_gpu);
775 ttm_bo_unreserve(bo);
776
777 kref_put(&bo->list_kref, ttm_bo_release_list);
778 return ret;
779}
780
781void ttm_bo_mem_put(struct ttm_buffer_object *bo, struct ttm_mem_reg *mem)
782{
783 struct ttm_mem_type_manager *man = &bo->bdev->man[mem->mem_type];
784
785 if (mem->mm_node)
786 (*man->func->put_node)(man, mem);
787}
788EXPORT_SYMBOL(ttm_bo_mem_put);
789
790/**
791 * Repeatedly evict memory from the LRU for @mem_type until we create enough
792 * space, or we've evicted everything and there isn't enough space.
793 */
794static int ttm_bo_mem_force_space(struct ttm_buffer_object *bo,
795 uint32_t mem_type,
796 const struct ttm_place *place,
797 struct ttm_mem_reg *mem,
798 bool interruptible,
799 bool no_wait_gpu)
800{
801 struct ttm_bo_device *bdev = bo->bdev;
802 struct ttm_mem_type_manager *man = &bdev->man[mem_type];
803 int ret;
804
805 do {
806 ret = (*man->func->get_node)(man, bo, place, mem);
807 if (unlikely(ret != 0))
808 return ret;
809 if (mem->mm_node)
810 break;
811 ret = ttm_mem_evict_first(bdev, mem_type, place,
812 interruptible, no_wait_gpu);
813 if (unlikely(ret != 0))
814 return ret;
815 } while (1);
816 if (mem->mm_node == NULL)
817 return -ENOMEM;
818 mem->mem_type = mem_type;
819 return 0;
820}
821
822static uint32_t ttm_bo_select_caching(struct ttm_mem_type_manager *man,
823 uint32_t cur_placement,
824 uint32_t proposed_placement)
825{
826 uint32_t caching = proposed_placement & TTM_PL_MASK_CACHING;
827 uint32_t result = proposed_placement & ~TTM_PL_MASK_CACHING;
828
829 /**
830 * Keep current caching if possible.
831 */
832
833 if ((cur_placement & caching) != 0)
834 result |= (cur_placement & caching);
835 else if ((man->default_caching & caching) != 0)
836 result |= man->default_caching;
837 else if ((TTM_PL_FLAG_CACHED & caching) != 0)
838 result |= TTM_PL_FLAG_CACHED;
839 else if ((TTM_PL_FLAG_WC & caching) != 0)
840 result |= TTM_PL_FLAG_WC;
841 else if ((TTM_PL_FLAG_UNCACHED & caching) != 0)
842 result |= TTM_PL_FLAG_UNCACHED;
843
844 return result;
845}
846
847static bool ttm_bo_mt_compatible(struct ttm_mem_type_manager *man,
848 uint32_t mem_type,
849 const struct ttm_place *place,
850 uint32_t *masked_placement)
851{
852 uint32_t cur_flags = ttm_bo_type_flags(mem_type);
853
854 if ((cur_flags & place->flags & TTM_PL_MASK_MEM) == 0)
855 return false;
856
857 if ((place->flags & man->available_caching) == 0)
858 return false;
859
860 cur_flags |= (place->flags & man->available_caching);
861
862 *masked_placement = cur_flags;
863 return true;
864}
865
866/**
867 * Creates space for memory region @mem according to its type.
868 *
869 * This function first searches for free space in compatible memory types in
870 * the priority order defined by the driver. If free space isn't found, then
871 * ttm_bo_mem_force_space is attempted in priority order to evict and find
872 * space.
873 */
874int ttm_bo_mem_space(struct ttm_buffer_object *bo,
875 struct ttm_placement *placement,
876 struct ttm_mem_reg *mem,
877 bool interruptible,
878 bool no_wait_gpu)
879{
880 struct ttm_bo_device *bdev = bo->bdev;
881 struct ttm_mem_type_manager *man;
882 uint32_t mem_type = TTM_PL_SYSTEM;
883 uint32_t cur_flags = 0;
884 bool type_found = false;
885 bool type_ok = false;
886 bool has_erestartsys = false;
887 int i, ret;
888
889 mem->mm_node = NULL;
890 for (i = 0; i < placement->num_placement; ++i) {
891 const struct ttm_place *place = &placement->placement[i];
892
893 ret = ttm_mem_type_from_place(place, &mem_type);
894 if (ret)
895 return ret;
896 man = &bdev->man[mem_type];
897 if (!man->has_type || !man->use_type)
898 continue;
899
900 type_ok = ttm_bo_mt_compatible(man, mem_type, place,
901 &cur_flags);
902
903 if (!type_ok)
904 continue;
905
906 type_found = true;
907 cur_flags = ttm_bo_select_caching(man, bo->mem.placement,
908 cur_flags);
909 /*
910 * Use the access and other non-mapping-related flag bits from
911 * the memory placement flags to the current flags
912 */
913 ttm_flag_masked(&cur_flags, place->flags,
914 ~TTM_PL_MASK_MEMTYPE);
915
916 if (mem_type == TTM_PL_SYSTEM)
917 break;
918
919 ret = (*man->func->get_node)(man, bo, place, mem);
920 if (unlikely(ret))
921 return ret;
922
923 if (mem->mm_node)
924 break;
925 }
926
927 if ((type_ok && (mem_type == TTM_PL_SYSTEM)) || mem->mm_node) {
928 mem->mem_type = mem_type;
929 mem->placement = cur_flags;
930 return 0;
931 }
932
933 for (i = 0; i < placement->num_busy_placement; ++i) {
934 const struct ttm_place *place = &placement->busy_placement[i];
935
936 ret = ttm_mem_type_from_place(place, &mem_type);
937 if (ret)
938 return ret;
939 man = &bdev->man[mem_type];
940 if (!man->has_type || !man->use_type)
941 continue;
942 if (!ttm_bo_mt_compatible(man, mem_type, place, &cur_flags))
943 continue;
944
945 type_found = true;
946 cur_flags = ttm_bo_select_caching(man, bo->mem.placement,
947 cur_flags);
948 /*
949 * Use the access and other non-mapping-related flag bits from
950 * the memory placement flags to the current flags
951 */
952 ttm_flag_masked(&cur_flags, place->flags,
953 ~TTM_PL_MASK_MEMTYPE);
954
955 if (mem_type == TTM_PL_SYSTEM) {
956 mem->mem_type = mem_type;
957 mem->placement = cur_flags;
958 mem->mm_node = NULL;
959 return 0;
960 }
961
962 ret = ttm_bo_mem_force_space(bo, mem_type, place, mem,
963 interruptible, no_wait_gpu);
964 if (ret == 0 && mem->mm_node) {
965 mem->placement = cur_flags;
966 return 0;
967 }
968 if (ret == -ERESTARTSYS)
969 has_erestartsys = true;
970 }
971
972 if (!type_found) {
973 printk(KERN_ERR TTM_PFX "No compatible memory type found.\n");
974 return -EINVAL;
975 }
976
977 return (has_erestartsys) ? -ERESTARTSYS : -ENOMEM;
978}
979EXPORT_SYMBOL(ttm_bo_mem_space);
980
981static int ttm_bo_move_buffer(struct ttm_buffer_object *bo,
982 struct ttm_placement *placement,
983 bool interruptible,
984 bool no_wait_gpu)
985{
986 int ret = 0;
987 struct ttm_mem_reg mem;
988
989 lockdep_assert_held(&bo->resv->lock.base);
990
991 /*
992 * FIXME: It's possible to pipeline buffer moves.
993 * Have the driver move function wait for idle when necessary,
994 * instead of doing it here.
995 */
996 ret = ttm_bo_wait(bo, false, interruptible, no_wait_gpu);
997 if (ret)
998 return ret;
999 mem.num_pages = bo->num_pages;
1000 mem.size = mem.num_pages << PAGE_SHIFT;
1001 mem.page_alignment = bo->mem.page_alignment;
1002 mem.bus.io_reserved_vm = false;
1003 mem.bus.io_reserved_count = 0;
1004 /*
1005 * Determine where to move the buffer.
1006 */
1007 ret = ttm_bo_mem_space(bo, placement, &mem,
1008 interruptible, no_wait_gpu);
1009 if (ret)
1010 goto out_unlock;
1011 ret = ttm_bo_handle_move_mem(bo, &mem, false,
1012 interruptible, no_wait_gpu);
1013out_unlock:
1014 if (ret && mem.mm_node)
1015 ttm_bo_mem_put(bo, &mem);
1016 return ret;
1017}
1018
1019static bool ttm_bo_mem_compat(struct ttm_placement *placement,
1020 struct ttm_mem_reg *mem,
1021 uint32_t *new_flags)
1022{
1023 int i;
1024
1025 for (i = 0; i < placement->num_placement; i++) {
1026 const struct ttm_place *heap = &placement->placement[i];
1027 if (mem->mm_node &&
1028 (mem->start < heap->fpfn ||
1029 (heap->lpfn != 0 && (mem->start + mem->num_pages) > heap->lpfn)))
1030 continue;
1031
1032 *new_flags = heap->flags;
1033 if ((*new_flags & mem->placement & TTM_PL_MASK_CACHING) &&
1034 (*new_flags & mem->placement & TTM_PL_MASK_MEM))
1035 return true;
1036 }
1037
1038 for (i = 0; i < placement->num_busy_placement; i++) {
1039 const struct ttm_place *heap = &placement->busy_placement[i];
1040 if (mem->mm_node &&
1041 (mem->start < heap->fpfn ||
1042 (heap->lpfn != 0 && (mem->start + mem->num_pages) > heap->lpfn)))
1043 continue;
1044
1045 *new_flags = heap->flags;
1046 if ((*new_flags & mem->placement & TTM_PL_MASK_CACHING) &&
1047 (*new_flags & mem->placement & TTM_PL_MASK_MEM))
1048 return true;
1049 }
1050
1051 return false;
1052}
1053
1054int ttm_bo_validate(struct ttm_buffer_object *bo,
1055 struct ttm_placement *placement,
1056 bool interruptible,
1057 bool no_wait_gpu)
1058{
1059 int ret;
1060 uint32_t new_flags;
1061
1062 lockdep_assert_held(&bo->resv->lock.base);
1063 /*
1064 * Check whether we need to move buffer.
1065 */
1066 if (!ttm_bo_mem_compat(placement, &bo->mem, &new_flags)) {
1067 ret = ttm_bo_move_buffer(bo, placement, interruptible,
1068 no_wait_gpu);
1069 if (ret)
1070 return ret;
1071 } else {
1072 /*
1073 * Use the access and other non-mapping-related flag bits from
1074 * the compatible memory placement flags to the active flags
1075 */
1076 ttm_flag_masked(&bo->mem.placement, new_flags,
1077 ~TTM_PL_MASK_MEMTYPE);
1078 }
1079 /*
1080 * We might need to add a TTM.
1081 */
1082 if (bo->mem.mem_type == TTM_PL_SYSTEM && bo->ttm == NULL) {
1083 ret = ttm_bo_add_ttm(bo, true);
1084 if (ret)
1085 return ret;
1086 }
1087 return 0;
1088}
1089EXPORT_SYMBOL(ttm_bo_validate);
1090
1091int ttm_bo_init(struct ttm_bo_device *bdev,
1092 struct ttm_buffer_object *bo,
1093 unsigned long size,
1094 enum ttm_bo_type type,
1095 struct ttm_placement *placement,
1096 uint32_t page_alignment,
1097 bool interruptible,
1098 struct file *persistent_swap_storage,
1099 size_t acc_size,
1100 struct sg_table *sg,
1101 struct reservation_object *resv,
1102 void (*destroy) (struct ttm_buffer_object *))
1103{
1104 int ret = 0;
1105 unsigned long num_pages;
1106 struct ttm_mem_global *mem_glob = bdev->glob->mem_glob;
1107 bool locked;
1108
1109 ret = ttm_mem_global_alloc(mem_glob, acc_size, false, false);
1110 if (ret) {
1111 pr_err("Out of kernel memory\n");
1112 if (destroy)
1113 (*destroy)(bo);
1114 else
1115 kfree(bo);
1116 return -ENOMEM;
1117 }
1118
1119 num_pages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
1120 if (num_pages == 0) {
1121 pr_err("Illegal buffer object size\n");
1122 if (destroy)
1123 (*destroy)(bo);
1124 else
1125 kfree(bo);
1126 ttm_mem_global_free(mem_glob, acc_size);
1127 return -EINVAL;
1128 }
1129 bo->destroy = destroy;
1130
1131 kref_init(&bo->kref);
1132 kref_init(&bo->list_kref);
1133 atomic_set(&bo->cpu_writers, 0);
1134 INIT_LIST_HEAD(&bo->lru);
1135 INIT_LIST_HEAD(&bo->ddestroy);
1136 INIT_LIST_HEAD(&bo->swap);
1137 INIT_LIST_HEAD(&bo->io_reserve_lru);
1138 mutex_init(&bo->wu_mutex);
1139 bo->bdev = bdev;
1140 bo->glob = bdev->glob;
1141 bo->type = type;
1142 bo->num_pages = num_pages;
1143 bo->mem.size = num_pages << PAGE_SHIFT;
1144 bo->mem.mem_type = TTM_PL_SYSTEM;
1145 bo->mem.num_pages = bo->num_pages;
1146 bo->mem.mm_node = NULL;
1147 bo->mem.page_alignment = page_alignment;
1148 bo->mem.bus.io_reserved_vm = false;
1149 bo->mem.bus.io_reserved_count = 0;
1150 bo->priv_flags = 0;
1151 bo->mem.placement = (TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED);
1152 bo->persistent_swap_storage = persistent_swap_storage;
1153 bo->acc_size = acc_size;
1154 bo->sg = sg;
1155 if (resv) {
1156 bo->resv = resv;
1157 lockdep_assert_held(&bo->resv->lock.base);
1158 } else {
1159 bo->resv = &bo->ttm_resv;
1160 reservation_object_init(&bo->ttm_resv);
1161 }
1162 atomic_inc(&bo->glob->bo_count);
1163 drm_vma_node_reset(&bo->vma_node);
1164
1165 /*
1166 * For ttm_bo_type_device buffers, allocate
1167 * address space from the device.
1168 */
1169 if (bo->type == ttm_bo_type_device ||
1170 bo->type == ttm_bo_type_sg)
1171 ret = drm_vma_offset_add(&bdev->vma_manager, &bo->vma_node,
1172 bo->mem.num_pages);
1173
1174 /* passed reservation objects should already be locked,
1175 * since otherwise lockdep will be angered in radeon.
1176 */
1177 if (!resv) {
1178 locked = ww_mutex_trylock(&bo->resv->lock);
1179 WARN_ON(!locked);
1180 }
1181
1182 if (likely(!ret))
1183 ret = ttm_bo_validate(bo, placement, interruptible, false);
1184
1185 if (!resv) {
1186 ttm_bo_unreserve(bo);
1187
1188 } else if (!(bo->mem.placement & TTM_PL_FLAG_NO_EVICT)) {
1189 spin_lock(&bo->glob->lru_lock);
1190 ttm_bo_add_to_lru(bo);
1191 spin_unlock(&bo->glob->lru_lock);
1192 }
1193
1194 if (unlikely(ret))
1195 ttm_bo_unref(&bo);
1196
1197 return ret;
1198}
1199EXPORT_SYMBOL(ttm_bo_init);
1200
1201size_t ttm_bo_acc_size(struct ttm_bo_device *bdev,
1202 unsigned long bo_size,
1203 unsigned struct_size)
1204{
1205 unsigned npages = (PAGE_ALIGN(bo_size)) >> PAGE_SHIFT;
1206 size_t size = 0;
1207
1208 size += ttm_round_pot(struct_size);
1209 size += PAGE_ALIGN(npages * sizeof(void *));
1210 size += ttm_round_pot(sizeof(struct ttm_tt));
1211 return size;
1212}
1213EXPORT_SYMBOL(ttm_bo_acc_size);
1214
1215size_t ttm_bo_dma_acc_size(struct ttm_bo_device *bdev,
1216 unsigned long bo_size,
1217 unsigned struct_size)
1218{
1219 unsigned npages = (PAGE_ALIGN(bo_size)) >> PAGE_SHIFT;
1220 size_t size = 0;
1221
1222 size += ttm_round_pot(struct_size);
1223 size += PAGE_ALIGN(npages * sizeof(void *));
1224 size += PAGE_ALIGN(npages * sizeof(dma_addr_t));
1225 size += ttm_round_pot(sizeof(struct ttm_dma_tt));
1226 return size;
1227}
1228EXPORT_SYMBOL(ttm_bo_dma_acc_size);
1229
1230int ttm_bo_create(struct ttm_bo_device *bdev,
1231 unsigned long size,
1232 enum ttm_bo_type type,
1233 struct ttm_placement *placement,
1234 uint32_t page_alignment,
1235 bool interruptible,
1236 struct file *persistent_swap_storage,
1237 struct ttm_buffer_object **p_bo)
1238{
1239 struct ttm_buffer_object *bo;
1240 size_t acc_size;
1241 int ret;
1242
1243 bo = kzalloc(sizeof(*bo), GFP_KERNEL);
1244 if (unlikely(bo == NULL))
1245 return -ENOMEM;
1246
1247 acc_size = ttm_bo_acc_size(bdev, size, sizeof(struct ttm_buffer_object));
1248 ret = ttm_bo_init(bdev, bo, size, type, placement, page_alignment,
1249 interruptible, persistent_swap_storage, acc_size,
1250 NULL, NULL, NULL);
1251 if (likely(ret == 0))
1252 *p_bo = bo;
1253
1254 return ret;
1255}
1256EXPORT_SYMBOL(ttm_bo_create);
1257
1258static int ttm_bo_force_list_clean(struct ttm_bo_device *bdev,
1259 unsigned mem_type, bool allow_errors)
1260{
1261 struct ttm_mem_type_manager *man = &bdev->man[mem_type];
1262 struct ttm_bo_global *glob = bdev->glob;
1263 int ret;
1264
1265 /*
1266 * Can't use standard list traversal since we're unlocking.
1267 */
1268
1269 spin_lock(&glob->lru_lock);
1270 while (!list_empty(&man->lru)) {
1271 spin_unlock(&glob->lru_lock);
1272 ret = ttm_mem_evict_first(bdev, mem_type, NULL, false, false);
1273 if (ret) {
1274 if (allow_errors) {
1275 return ret;
1276 } else {
1277 pr_err("Cleanup eviction failed\n");
1278 }
1279 }
1280 spin_lock(&glob->lru_lock);
1281 }
1282 spin_unlock(&glob->lru_lock);
1283 return 0;
1284}
1285
1286int ttm_bo_clean_mm(struct ttm_bo_device *bdev, unsigned mem_type)
1287{
1288 struct ttm_mem_type_manager *man;
1289 int ret = -EINVAL;
1290
1291 if (mem_type >= TTM_NUM_MEM_TYPES) {
1292 pr_err("Illegal memory type %d\n", mem_type);
1293 return ret;
1294 }
1295 man = &bdev->man[mem_type];
1296
1297 if (!man->has_type) {
1298 pr_err("Trying to take down uninitialized memory manager type %u\n",
1299 mem_type);
1300 return ret;
1301 }
1302
1303 man->use_type = false;
1304 man->has_type = false;
1305
1306 ret = 0;
1307 if (mem_type > 0) {
1308 ttm_bo_force_list_clean(bdev, mem_type, false);
1309
1310 ret = (*man->func->takedown)(man);
1311 }
1312
1313 return ret;
1314}
1315EXPORT_SYMBOL(ttm_bo_clean_mm);
1316
1317int ttm_bo_evict_mm(struct ttm_bo_device *bdev, unsigned mem_type)
1318{
1319 struct ttm_mem_type_manager *man = &bdev->man[mem_type];
1320
1321 if (mem_type == 0 || mem_type >= TTM_NUM_MEM_TYPES) {
1322 pr_err("Illegal memory manager memory type %u\n", mem_type);
1323 return -EINVAL;
1324 }
1325
1326 if (!man->has_type) {
1327 pr_err("Memory type %u has not been initialized\n", mem_type);
1328 return 0;
1329 }
1330
1331 return ttm_bo_force_list_clean(bdev, mem_type, true);
1332}
1333EXPORT_SYMBOL(ttm_bo_evict_mm);
1334
1335int ttm_bo_init_mm(struct ttm_bo_device *bdev, unsigned type,
1336 unsigned long p_size)
1337{
1338 int ret = -EINVAL;
1339 struct ttm_mem_type_manager *man;
1340
1341 BUG_ON(type >= TTM_NUM_MEM_TYPES);
1342 man = &bdev->man[type];
1343 BUG_ON(man->has_type);
1344 man->io_reserve_fastpath = true;
1345 man->use_io_reserve_lru = false;
1346 mutex_init(&man->io_reserve_mutex);
1347 INIT_LIST_HEAD(&man->io_reserve_lru);
1348
1349 ret = bdev->driver->init_mem_type(bdev, type, man);
1350 if (ret)
1351 return ret;
1352 man->bdev = bdev;
1353
1354 ret = 0;
1355 if (type != TTM_PL_SYSTEM) {
1356 ret = (*man->func->init)(man, p_size);
1357 if (ret)
1358 return ret;
1359 }
1360 man->has_type = true;
1361 man->use_type = true;
1362 man->size = p_size;
1363
1364 INIT_LIST_HEAD(&man->lru);
1365
1366 return 0;
1367}
1368EXPORT_SYMBOL(ttm_bo_init_mm);
1369
1370static void ttm_bo_global_kobj_release(struct kobject *kobj)
1371{
1372 struct ttm_bo_global *glob =
1373 container_of(kobj, struct ttm_bo_global, kobj);
1374
1375 ttm_mem_unregister_shrink(glob->mem_glob, &glob->shrink);
1376 __free_page(glob->dummy_read_page);
1377 kfree(glob);
1378}
1379
1380void ttm_bo_global_release(struct drm_global_reference *ref)
1381{
1382 struct ttm_bo_global *glob = ref->object;
1383
1384 kobject_del(&glob->kobj);
1385 kobject_put(&glob->kobj);
1386}
1387EXPORT_SYMBOL(ttm_bo_global_release);
1388
1389int ttm_bo_global_init(struct drm_global_reference *ref)
1390{
1391 struct ttm_bo_global_ref *bo_ref =
1392 container_of(ref, struct ttm_bo_global_ref, ref);
1393 struct ttm_bo_global *glob = ref->object;
1394 int ret;
1395
1396 mutex_init(&glob->device_list_mutex);
1397 spin_lock_init(&glob->lru_lock);
1398 glob->mem_glob = bo_ref->mem_glob;
1399 glob->dummy_read_page = alloc_page(__GFP_ZERO | GFP_DMA32);
1400
1401 if (unlikely(glob->dummy_read_page == NULL)) {
1402 ret = -ENOMEM;
1403 goto out_no_drp;
1404 }
1405
1406 INIT_LIST_HEAD(&glob->swap_lru);
1407 INIT_LIST_HEAD(&glob->device_list);
1408
1409 ttm_mem_init_shrink(&glob->shrink, ttm_bo_swapout);
1410 ret = ttm_mem_register_shrink(glob->mem_glob, &glob->shrink);
1411 if (unlikely(ret != 0)) {
1412 pr_err("Could not register buffer object swapout\n");
1413 goto out_no_shrink;
1414 }
1415
1416 atomic_set(&glob->bo_count, 0);
1417
1418 ret = kobject_init_and_add(
1419 &glob->kobj, &ttm_bo_glob_kobj_type, ttm_get_kobj(), "buffer_objects");
1420 if (unlikely(ret != 0))
1421 kobject_put(&glob->kobj);
1422 return ret;
1423out_no_shrink:
1424 __free_page(glob->dummy_read_page);
1425out_no_drp:
1426 kfree(glob);
1427 return ret;
1428}
1429EXPORT_SYMBOL(ttm_bo_global_init);
1430
1431
1432int ttm_bo_device_release(struct ttm_bo_device *bdev)
1433{
1434 int ret = 0;
1435 unsigned i = TTM_NUM_MEM_TYPES;
1436 struct ttm_mem_type_manager *man;
1437 struct ttm_bo_global *glob = bdev->glob;
1438
1439 while (i--) {
1440 man = &bdev->man[i];
1441 if (man->has_type) {
1442 man->use_type = false;
1443 if ((i != TTM_PL_SYSTEM) && ttm_bo_clean_mm(bdev, i)) {
1444 ret = -EBUSY;
1445 pr_err("DRM memory manager type %d is not clean\n",
1446 i);
1447 }
1448 man->has_type = false;
1449 }
1450 }
1451
1452 mutex_lock(&glob->device_list_mutex);
1453 list_del(&bdev->device_list);
1454 mutex_unlock(&glob->device_list_mutex);
1455
1456 cancel_delayed_work_sync(&bdev->wq);
1457
1458 while (ttm_bo_delayed_delete(bdev, true))
1459 ;
1460
1461 spin_lock(&glob->lru_lock);
1462 if (list_empty(&bdev->ddestroy))
1463 TTM_DEBUG("Delayed destroy list was clean\n");
1464
1465 if (list_empty(&bdev->man[0].lru))
1466 TTM_DEBUG("Swap list was clean\n");
1467 spin_unlock(&glob->lru_lock);
1468
1469 drm_vma_offset_manager_destroy(&bdev->vma_manager);
1470
1471 return ret;
1472}
1473EXPORT_SYMBOL(ttm_bo_device_release);
1474
1475int ttm_bo_device_init(struct ttm_bo_device *bdev,
1476 struct ttm_bo_global *glob,
1477 struct ttm_bo_driver *driver,
1478 struct address_space *mapping,
1479 uint64_t file_page_offset,
1480 bool need_dma32)
1481{
1482 int ret = -EINVAL;
1483
1484 bdev->driver = driver;
1485
1486 memset(bdev->man, 0, sizeof(bdev->man));
1487
1488 /*
1489 * Initialize the system memory buffer type.
1490 * Other types need to be driver / IOCTL initialized.
1491 */
1492 ret = ttm_bo_init_mm(bdev, TTM_PL_SYSTEM, 0);
1493 if (unlikely(ret != 0))
1494 goto out_no_sys;
1495
1496 drm_vma_offset_manager_init(&bdev->vma_manager, file_page_offset,
1497 0x10000000);
1498 INIT_DELAYED_WORK(&bdev->wq, ttm_bo_delayed_workqueue);
1499 INIT_LIST_HEAD(&bdev->ddestroy);
1500 bdev->dev_mapping = mapping;
1501 bdev->glob = glob;
1502 bdev->need_dma32 = need_dma32;
1503 bdev->val_seq = 0;
1504 mutex_lock(&glob->device_list_mutex);
1505 list_add_tail(&bdev->device_list, &glob->device_list);
1506 mutex_unlock(&glob->device_list_mutex);
1507
1508 return 0;
1509out_no_sys:
1510 return ret;
1511}
1512EXPORT_SYMBOL(ttm_bo_device_init);
1513
1514/*
1515 * buffer object vm functions.
1516 */
1517
1518bool ttm_mem_reg_is_pci(struct ttm_bo_device *bdev, struct ttm_mem_reg *mem)
1519{
1520 struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
1521
1522 if (!(man->flags & TTM_MEMTYPE_FLAG_FIXED)) {
1523 if (mem->mem_type == TTM_PL_SYSTEM)
1524 return false;
1525
1526 if (man->flags & TTM_MEMTYPE_FLAG_CMA)
1527 return false;
1528
1529 if (mem->placement & TTM_PL_FLAG_CACHED)
1530 return false;
1531 }
1532 return true;
1533}
1534
1535void ttm_bo_unmap_virtual_locked(struct ttm_buffer_object *bo)
1536{
1537 struct ttm_bo_device *bdev = bo->bdev;
1538
1539 drm_vma_node_unmap(&bo->vma_node, bdev->dev_mapping);
1540 ttm_mem_io_free_vm(bo);
1541}
1542
1543void ttm_bo_unmap_virtual(struct ttm_buffer_object *bo)
1544{
1545 struct ttm_bo_device *bdev = bo->bdev;
1546 struct ttm_mem_type_manager *man = &bdev->man[bo->mem.mem_type];
1547
1548 ttm_mem_io_lock(man, false);
1549 ttm_bo_unmap_virtual_locked(bo);
1550 ttm_mem_io_unlock(man);
1551}
1552
1553
1554EXPORT_SYMBOL(ttm_bo_unmap_virtual);
1555
1556int ttm_bo_wait(struct ttm_buffer_object *bo,
1557 bool lazy, bool interruptible, bool no_wait)
1558{
1559 struct reservation_object_list *fobj;
1560 struct reservation_object *resv;
1561 struct fence *excl;
1562 long timeout = 15 * HZ;
1563 int i;
1564
1565 resv = bo->resv;
1566 fobj = reservation_object_get_list(resv);
1567 excl = reservation_object_get_excl(resv);
1568 if (excl) {
1569 if (!fence_is_signaled(excl)) {
1570 if (no_wait)
1571 return -EBUSY;
1572
1573 timeout = fence_wait_timeout(excl,
1574 interruptible, timeout);
1575 }
1576 }
1577
1578 for (i = 0; fobj && timeout > 0 && i < fobj->shared_count; ++i) {
1579 struct fence *fence;
1580 fence = rcu_dereference_protected(fobj->shared[i],
1581 reservation_object_held(resv));
1582
1583 if (!fence_is_signaled(fence)) {
1584 if (no_wait)
1585 return -EBUSY;
1586
1587 timeout = fence_wait_timeout(fence,
1588 interruptible, timeout);
1589 }
1590 }
1591
1592 if (timeout < 0)
1593 return timeout;
1594
1595 if (timeout == 0)
1596 return -EBUSY;
1597
1598 reservation_object_add_excl_fence(resv, NULL);
1599 clear_bit(TTM_BO_PRIV_FLAG_MOVING, &bo->priv_flags);
1600 return 0;
1601}
1602EXPORT_SYMBOL(ttm_bo_wait);
1603
1604int ttm_bo_synccpu_write_grab(struct ttm_buffer_object *bo, bool no_wait)
1605{
1606 int ret = 0;
1607
1608 /*
1609 * Using ttm_bo_reserve makes sure the lru lists are updated.
1610 */
1611
1612 ret = ttm_bo_reserve(bo, true, no_wait, false, NULL);
1613 if (unlikely(ret != 0))
1614 return ret;
1615 ret = ttm_bo_wait(bo, false, true, no_wait);
1616 if (likely(ret == 0))
1617 atomic_inc(&bo->cpu_writers);
1618 ttm_bo_unreserve(bo);
1619 return ret;
1620}
1621EXPORT_SYMBOL(ttm_bo_synccpu_write_grab);
1622
1623void ttm_bo_synccpu_write_release(struct ttm_buffer_object *bo)
1624{
1625 atomic_dec(&bo->cpu_writers);
1626}
1627EXPORT_SYMBOL(ttm_bo_synccpu_write_release);
1628
1629/**
1630 * A buffer object shrink method that tries to swap out the first
1631 * buffer object on the bo_global::swap_lru list.
1632 */
1633
1634static int ttm_bo_swapout(struct ttm_mem_shrink *shrink)
1635{
1636 struct ttm_bo_global *glob =
1637 container_of(shrink, struct ttm_bo_global, shrink);
1638 struct ttm_buffer_object *bo;
1639 int ret = -EBUSY;
1640 int put_count;
1641 uint32_t swap_placement = (TTM_PL_FLAG_CACHED | TTM_PL_FLAG_SYSTEM);
1642
1643 spin_lock(&glob->lru_lock);
1644 list_for_each_entry(bo, &glob->swap_lru, swap) {
1645 ret = __ttm_bo_reserve(bo, false, true, false, NULL);
1646 if (!ret)
1647 break;
1648 }
1649
1650 if (ret) {
1651 spin_unlock(&glob->lru_lock);
1652 return ret;
1653 }
1654
1655 kref_get(&bo->list_kref);
1656
1657 if (!list_empty(&bo->ddestroy)) {
1658 ret = ttm_bo_cleanup_refs_and_unlock(bo, false, false);
1659 kref_put(&bo->list_kref, ttm_bo_release_list);
1660 return ret;
1661 }
1662
1663 put_count = ttm_bo_del_from_lru(bo);
1664 spin_unlock(&glob->lru_lock);
1665
1666 ttm_bo_list_ref_sub(bo, put_count, true);
1667
1668 /**
1669 * Wait for GPU, then move to system cached.
1670 */
1671
1672 ret = ttm_bo_wait(bo, false, false, false);
1673
1674 if (unlikely(ret != 0))
1675 goto out;
1676
1677 if ((bo->mem.placement & swap_placement) != swap_placement) {
1678 struct ttm_mem_reg evict_mem;
1679
1680 evict_mem = bo->mem;
1681 evict_mem.mm_node = NULL;
1682 evict_mem.placement = TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED;
1683 evict_mem.mem_type = TTM_PL_SYSTEM;
1684
1685 ret = ttm_bo_handle_move_mem(bo, &evict_mem, true,
1686 false, false);
1687 if (unlikely(ret != 0))
1688 goto out;
1689 }
1690
1691 ttm_bo_unmap_virtual(bo);
1692
1693 /**
1694 * Swap out. Buffer will be swapped in again as soon as
1695 * anyone tries to access a ttm page.
1696 */
1697
1698 if (bo->bdev->driver->swap_notify)
1699 bo->bdev->driver->swap_notify(bo);
1700
1701 ret = ttm_tt_swapout(bo->ttm, bo->persistent_swap_storage);
1702out:
1703
1704 /**
1705 *
1706 * Unreserve without putting on LRU to avoid swapping out an
1707 * already swapped buffer.
1708 */
1709
1710 __ttm_bo_unreserve(bo);
1711 kref_put(&bo->list_kref, ttm_bo_release_list);
1712 return ret;
1713}
1714
1715void ttm_bo_swapout_all(struct ttm_bo_device *bdev)
1716{
1717 while (ttm_bo_swapout(&bdev->glob->shrink) == 0)
1718 ;
1719}
1720EXPORT_SYMBOL(ttm_bo_swapout_all);
1721
1722/**
1723 * ttm_bo_wait_unreserved - interruptible wait for a buffer object to become
1724 * unreserved
1725 *
1726 * @bo: Pointer to buffer
1727 */
1728int ttm_bo_wait_unreserved(struct ttm_buffer_object *bo)
1729{
1730 int ret;
1731
1732 /*
1733 * In the absense of a wait_unlocked API,
1734 * Use the bo::wu_mutex to avoid triggering livelocks due to
1735 * concurrent use of this function. Note that this use of
1736 * bo::wu_mutex can go away if we change locking order to
1737 * mmap_sem -> bo::reserve.
1738 */
1739 ret = mutex_lock_interruptible(&bo->wu_mutex);
1740 if (unlikely(ret != 0))
1741 return -ERESTARTSYS;
1742 if (!ww_mutex_is_locked(&bo->resv->lock))
1743 goto out_unlock;
1744 ret = __ttm_bo_reserve(bo, true, false, false, NULL);
1745 if (unlikely(ret != 0))
1746 goto out_unlock;
1747 __ttm_bo_unreserve(bo);
1748
1749out_unlock:
1750 mutex_unlock(&bo->wu_mutex);
1751 return ret;
1752}
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
49static int ttm_bo_swapout(struct ttm_mem_shrink *shrink);
50static void ttm_bo_global_kobj_release(struct kobject *kobj);
51
52static struct attribute ttm_bo_count = {
53 .name = "bo_count",
54 .mode = S_IRUGO
55};
56
57static 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
70static 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
85static 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
104static 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
115static struct attribute *ttm_bo_global_attrs[] = {
116 &ttm_bo_count,
117 NULL
118};
119
120static const struct sysfs_ops ttm_bo_global_ops = {
121 .show = &ttm_bo_global_show
122};
123
124static 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
131static inline uint32_t ttm_bo_type_flags(unsigned type)
132{
133 return 1 << (type);
134}
135
136static 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
163void ttm_bo_add_to_lru(struct ttm_buffer_object *bo)
164{
165 struct ttm_bo_device *bdev = bo->bdev;
166
167 lockdep_assert_held(&bo->resv->lock.base);
168
169 if (!(bo->mem.placement & TTM_PL_FLAG_NO_EVICT)) {
170
171 BUG_ON(!list_empty(&bo->lru));
172
173 list_add(&bo->lru, bdev->driver->lru_tail(bo));
174 kref_get(&bo->list_kref);
175
176 if (bo->ttm && !(bo->ttm->page_flags & TTM_PAGE_FLAG_SG)) {
177 list_add(&bo->swap, bdev->driver->swap_lru_tail(bo));
178 kref_get(&bo->list_kref);
179 }
180 }
181}
182EXPORT_SYMBOL(ttm_bo_add_to_lru);
183
184int ttm_bo_del_from_lru(struct ttm_buffer_object *bo)
185{
186 struct ttm_bo_device *bdev = bo->bdev;
187 int put_count = 0;
188
189 if (bdev->driver->lru_removal)
190 bdev->driver->lru_removal(bo);
191
192 if (!list_empty(&bo->swap)) {
193 list_del_init(&bo->swap);
194 ++put_count;
195 }
196 if (!list_empty(&bo->lru)) {
197 list_del_init(&bo->lru);
198 ++put_count;
199 }
200
201 return put_count;
202}
203
204static void ttm_bo_ref_bug(struct kref *list_kref)
205{
206 BUG();
207}
208
209void ttm_bo_list_ref_sub(struct ttm_buffer_object *bo, int count,
210 bool never_free)
211{
212 kref_sub(&bo->list_kref, count,
213 (never_free) ? ttm_bo_ref_bug : ttm_bo_release_list);
214}
215
216void ttm_bo_del_sub_from_lru(struct ttm_buffer_object *bo)
217{
218 int put_count;
219
220 spin_lock(&bo->glob->lru_lock);
221 put_count = ttm_bo_del_from_lru(bo);
222 spin_unlock(&bo->glob->lru_lock);
223 ttm_bo_list_ref_sub(bo, put_count, true);
224}
225EXPORT_SYMBOL(ttm_bo_del_sub_from_lru);
226
227void ttm_bo_move_to_lru_tail(struct ttm_buffer_object *bo)
228{
229 struct ttm_bo_device *bdev = bo->bdev;
230 int put_count = 0;
231
232 lockdep_assert_held(&bo->resv->lock.base);
233
234 if (bdev->driver->lru_removal)
235 bdev->driver->lru_removal(bo);
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}
241EXPORT_SYMBOL(ttm_bo_move_to_lru_tail);
242
243struct list_head *ttm_bo_default_lru_tail(struct ttm_buffer_object *bo)
244{
245 return bo->bdev->man[bo->mem.mem_type].lru.prev;
246}
247EXPORT_SYMBOL(ttm_bo_default_lru_tail);
248
249struct list_head *ttm_bo_default_swap_lru_tail(struct ttm_buffer_object *bo)
250{
251 return bo->glob->swap_lru.prev;
252}
253EXPORT_SYMBOL(ttm_bo_default_swap_lru_tail);
254
255/*
256 * Call bo->mutex locked.
257 */
258static int ttm_bo_add_ttm(struct ttm_buffer_object *bo, bool zero_alloc)
259{
260 struct ttm_bo_device *bdev = bo->bdev;
261 struct ttm_bo_global *glob = bo->glob;
262 int ret = 0;
263 uint32_t page_flags = 0;
264
265 TTM_ASSERT_LOCKED(&bo->mutex);
266 bo->ttm = NULL;
267
268 if (bdev->need_dma32)
269 page_flags |= TTM_PAGE_FLAG_DMA32;
270
271 switch (bo->type) {
272 case ttm_bo_type_device:
273 if (zero_alloc)
274 page_flags |= TTM_PAGE_FLAG_ZERO_ALLOC;
275 case ttm_bo_type_kernel:
276 bo->ttm = bdev->driver->ttm_tt_create(bdev, bo->num_pages << PAGE_SHIFT,
277 page_flags, glob->dummy_read_page);
278 if (unlikely(bo->ttm == NULL))
279 ret = -ENOMEM;
280 break;
281 case ttm_bo_type_sg:
282 bo->ttm = bdev->driver->ttm_tt_create(bdev, bo->num_pages << PAGE_SHIFT,
283 page_flags | TTM_PAGE_FLAG_SG,
284 glob->dummy_read_page);
285 if (unlikely(bo->ttm == NULL)) {
286 ret = -ENOMEM;
287 break;
288 }
289 bo->ttm->sg = bo->sg;
290 break;
291 default:
292 pr_err("Illegal buffer object type\n");
293 ret = -EINVAL;
294 break;
295 }
296
297 return ret;
298}
299
300static int ttm_bo_handle_move_mem(struct ttm_buffer_object *bo,
301 struct ttm_mem_reg *mem,
302 bool evict, bool interruptible,
303 bool no_wait_gpu)
304{
305 struct ttm_bo_device *bdev = bo->bdev;
306 bool old_is_pci = ttm_mem_reg_is_pci(bdev, &bo->mem);
307 bool new_is_pci = ttm_mem_reg_is_pci(bdev, mem);
308 struct ttm_mem_type_manager *old_man = &bdev->man[bo->mem.mem_type];
309 struct ttm_mem_type_manager *new_man = &bdev->man[mem->mem_type];
310 int ret = 0;
311
312 if (old_is_pci || new_is_pci ||
313 ((mem->placement & bo->mem.placement & TTM_PL_MASK_CACHING) == 0)) {
314 ret = ttm_mem_io_lock(old_man, true);
315 if (unlikely(ret != 0))
316 goto out_err;
317 ttm_bo_unmap_virtual_locked(bo);
318 ttm_mem_io_unlock(old_man);
319 }
320
321 /*
322 * Create and bind a ttm if required.
323 */
324
325 if (!(new_man->flags & TTM_MEMTYPE_FLAG_FIXED)) {
326 if (bo->ttm == NULL) {
327 bool zero = !(old_man->flags & TTM_MEMTYPE_FLAG_FIXED);
328 ret = ttm_bo_add_ttm(bo, zero);
329 if (ret)
330 goto out_err;
331 }
332
333 ret = ttm_tt_set_placement_caching(bo->ttm, mem->placement);
334 if (ret)
335 goto out_err;
336
337 if (mem->mem_type != TTM_PL_SYSTEM) {
338 ret = ttm_tt_bind(bo->ttm, mem);
339 if (ret)
340 goto out_err;
341 }
342
343 if (bo->mem.mem_type == TTM_PL_SYSTEM) {
344 if (bdev->driver->move_notify)
345 bdev->driver->move_notify(bo, mem);
346 bo->mem = *mem;
347 mem->mm_node = NULL;
348 goto moved;
349 }
350 }
351
352 if (bdev->driver->move_notify)
353 bdev->driver->move_notify(bo, mem);
354
355 if (!(old_man->flags & TTM_MEMTYPE_FLAG_FIXED) &&
356 !(new_man->flags & TTM_MEMTYPE_FLAG_FIXED))
357 ret = ttm_bo_move_ttm(bo, interruptible, no_wait_gpu, mem);
358 else if (bdev->driver->move)
359 ret = bdev->driver->move(bo, evict, interruptible,
360 no_wait_gpu, mem);
361 else
362 ret = ttm_bo_move_memcpy(bo, interruptible, no_wait_gpu, mem);
363
364 if (ret) {
365 if (bdev->driver->move_notify) {
366 struct ttm_mem_reg tmp_mem = *mem;
367 *mem = bo->mem;
368 bo->mem = tmp_mem;
369 bdev->driver->move_notify(bo, mem);
370 bo->mem = *mem;
371 *mem = tmp_mem;
372 }
373
374 goto out_err;
375 }
376
377moved:
378 if (bo->evicted) {
379 if (bdev->driver->invalidate_caches) {
380 ret = bdev->driver->invalidate_caches(bdev, bo->mem.placement);
381 if (ret)
382 pr_err("Can not flush read caches\n");
383 }
384 bo->evicted = false;
385 }
386
387 if (bo->mem.mm_node) {
388 bo->offset = (bo->mem.start << PAGE_SHIFT) +
389 bdev->man[bo->mem.mem_type].gpu_offset;
390 bo->cur_placement = bo->mem.placement;
391 } else
392 bo->offset = 0;
393
394 return 0;
395
396out_err:
397 new_man = &bdev->man[bo->mem.mem_type];
398 if (new_man->flags & TTM_MEMTYPE_FLAG_FIXED) {
399 ttm_tt_destroy(bo->ttm);
400 bo->ttm = NULL;
401 }
402
403 return ret;
404}
405
406/**
407 * Call bo::reserved.
408 * Will release GPU memory type usage on destruction.
409 * This is the place to put in driver specific hooks to release
410 * driver private resources.
411 * Will release the bo::reserved lock.
412 */
413
414static void ttm_bo_cleanup_memtype_use(struct ttm_buffer_object *bo)
415{
416 if (bo->bdev->driver->move_notify)
417 bo->bdev->driver->move_notify(bo, NULL);
418
419 ttm_tt_destroy(bo->ttm);
420 bo->ttm = NULL;
421 ttm_bo_mem_put(bo, &bo->mem);
422
423 ww_mutex_unlock (&bo->resv->lock);
424}
425
426static void ttm_bo_flush_all_fences(struct ttm_buffer_object *bo)
427{
428 struct reservation_object_list *fobj;
429 struct dma_fence *fence;
430 int i;
431
432 fobj = reservation_object_get_list(bo->resv);
433 fence = reservation_object_get_excl(bo->resv);
434 if (fence && !fence->ops->signaled)
435 dma_fence_enable_sw_signaling(fence);
436
437 for (i = 0; fobj && i < fobj->shared_count; ++i) {
438 fence = rcu_dereference_protected(fobj->shared[i],
439 reservation_object_held(bo->resv));
440
441 if (!fence->ops->signaled)
442 dma_fence_enable_sw_signaling(fence);
443 }
444}
445
446static void ttm_bo_cleanup_refs_or_queue(struct ttm_buffer_object *bo)
447{
448 struct ttm_bo_device *bdev = bo->bdev;
449 struct ttm_bo_global *glob = bo->glob;
450 int put_count;
451 int ret;
452
453 spin_lock(&glob->lru_lock);
454 ret = __ttm_bo_reserve(bo, false, true, NULL);
455
456 if (!ret) {
457 if (!ttm_bo_wait(bo, false, true)) {
458 put_count = ttm_bo_del_from_lru(bo);
459
460 spin_unlock(&glob->lru_lock);
461 ttm_bo_cleanup_memtype_use(bo);
462
463 ttm_bo_list_ref_sub(bo, put_count, true);
464
465 return;
466 } else
467 ttm_bo_flush_all_fences(bo);
468
469 /*
470 * Make NO_EVICT bos immediately available to
471 * shrinkers, now that they are queued for
472 * destruction.
473 */
474 if (bo->mem.placement & TTM_PL_FLAG_NO_EVICT) {
475 bo->mem.placement &= ~TTM_PL_FLAG_NO_EVICT;
476 ttm_bo_add_to_lru(bo);
477 }
478
479 __ttm_bo_unreserve(bo);
480 }
481
482 kref_get(&bo->list_kref);
483 list_add_tail(&bo->ddestroy, &bdev->ddestroy);
484 spin_unlock(&glob->lru_lock);
485
486 schedule_delayed_work(&bdev->wq,
487 ((HZ / 100) < 1) ? 1 : HZ / 100);
488}
489
490/**
491 * function ttm_bo_cleanup_refs_and_unlock
492 * If bo idle, remove from delayed- and lru lists, and unref.
493 * If not idle, do nothing.
494 *
495 * Must be called with lru_lock and reservation held, this function
496 * will drop both before returning.
497 *
498 * @interruptible Any sleeps should occur interruptibly.
499 * @no_wait_gpu Never wait for gpu. Return -EBUSY instead.
500 */
501
502static int ttm_bo_cleanup_refs_and_unlock(struct ttm_buffer_object *bo,
503 bool interruptible,
504 bool no_wait_gpu)
505{
506 struct ttm_bo_global *glob = bo->glob;
507 int put_count;
508 int ret;
509
510 ret = ttm_bo_wait(bo, false, true);
511
512 if (ret && !no_wait_gpu) {
513 long lret;
514 ww_mutex_unlock(&bo->resv->lock);
515 spin_unlock(&glob->lru_lock);
516
517 lret = reservation_object_wait_timeout_rcu(bo->resv,
518 true,
519 interruptible,
520 30 * HZ);
521
522 if (lret < 0)
523 return lret;
524 else if (lret == 0)
525 return -EBUSY;
526
527 spin_lock(&glob->lru_lock);
528 ret = __ttm_bo_reserve(bo, false, true, NULL);
529
530 /*
531 * We raced, and lost, someone else holds the reservation now,
532 * and is probably busy in ttm_bo_cleanup_memtype_use.
533 *
534 * Even if it's not the case, because we finished waiting any
535 * delayed destruction would succeed, so just return success
536 * here.
537 */
538 if (ret) {
539 spin_unlock(&glob->lru_lock);
540 return 0;
541 }
542
543 /*
544 * remove sync_obj with ttm_bo_wait, the wait should be
545 * finished, and no new wait object should have been added.
546 */
547 ret = ttm_bo_wait(bo, false, true);
548 WARN_ON(ret);
549 }
550
551 if (ret || unlikely(list_empty(&bo->ddestroy))) {
552 __ttm_bo_unreserve(bo);
553 spin_unlock(&glob->lru_lock);
554 return ret;
555 }
556
557 put_count = ttm_bo_del_from_lru(bo);
558 list_del_init(&bo->ddestroy);
559 ++put_count;
560
561 spin_unlock(&glob->lru_lock);
562 ttm_bo_cleanup_memtype_use(bo);
563
564 ttm_bo_list_ref_sub(bo, put_count, true);
565
566 return 0;
567}
568
569/**
570 * Traverse the delayed list, and call ttm_bo_cleanup_refs on all
571 * encountered buffers.
572 */
573
574static int ttm_bo_delayed_delete(struct ttm_bo_device *bdev, bool remove_all)
575{
576 struct ttm_bo_global *glob = bdev->glob;
577 struct ttm_buffer_object *entry = NULL;
578 int ret = 0;
579
580 spin_lock(&glob->lru_lock);
581 if (list_empty(&bdev->ddestroy))
582 goto out_unlock;
583
584 entry = list_first_entry(&bdev->ddestroy,
585 struct ttm_buffer_object, ddestroy);
586 kref_get(&entry->list_kref);
587
588 for (;;) {
589 struct ttm_buffer_object *nentry = NULL;
590
591 if (entry->ddestroy.next != &bdev->ddestroy) {
592 nentry = list_first_entry(&entry->ddestroy,
593 struct ttm_buffer_object, ddestroy);
594 kref_get(&nentry->list_kref);
595 }
596
597 ret = __ttm_bo_reserve(entry, false, true, NULL);
598 if (remove_all && ret) {
599 spin_unlock(&glob->lru_lock);
600 ret = __ttm_bo_reserve(entry, false, false, NULL);
601 spin_lock(&glob->lru_lock);
602 }
603
604 if (!ret)
605 ret = ttm_bo_cleanup_refs_and_unlock(entry, false,
606 !remove_all);
607 else
608 spin_unlock(&glob->lru_lock);
609
610 kref_put(&entry->list_kref, ttm_bo_release_list);
611 entry = nentry;
612
613 if (ret || !entry)
614 goto out;
615
616 spin_lock(&glob->lru_lock);
617 if (list_empty(&entry->ddestroy))
618 break;
619 }
620
621out_unlock:
622 spin_unlock(&glob->lru_lock);
623out:
624 if (entry)
625 kref_put(&entry->list_kref, ttm_bo_release_list);
626 return ret;
627}
628
629static void ttm_bo_delayed_workqueue(struct work_struct *work)
630{
631 struct ttm_bo_device *bdev =
632 container_of(work, struct ttm_bo_device, wq.work);
633
634 if (ttm_bo_delayed_delete(bdev, false)) {
635 schedule_delayed_work(&bdev->wq,
636 ((HZ / 100) < 1) ? 1 : HZ / 100);
637 }
638}
639
640static void ttm_bo_release(struct kref *kref)
641{
642 struct ttm_buffer_object *bo =
643 container_of(kref, struct ttm_buffer_object, kref);
644 struct ttm_bo_device *bdev = bo->bdev;
645 struct ttm_mem_type_manager *man = &bdev->man[bo->mem.mem_type];
646
647 drm_vma_offset_remove(&bdev->vma_manager, &bo->vma_node);
648 ttm_mem_io_lock(man, false);
649 ttm_mem_io_free_vm(bo);
650 ttm_mem_io_unlock(man);
651 ttm_bo_cleanup_refs_or_queue(bo);
652 kref_put(&bo->list_kref, ttm_bo_release_list);
653}
654
655void ttm_bo_unref(struct ttm_buffer_object **p_bo)
656{
657 struct ttm_buffer_object *bo = *p_bo;
658
659 *p_bo = NULL;
660 kref_put(&bo->kref, ttm_bo_release);
661}
662EXPORT_SYMBOL(ttm_bo_unref);
663
664int ttm_bo_lock_delayed_workqueue(struct ttm_bo_device *bdev)
665{
666 return cancel_delayed_work_sync(&bdev->wq);
667}
668EXPORT_SYMBOL(ttm_bo_lock_delayed_workqueue);
669
670void ttm_bo_unlock_delayed_workqueue(struct ttm_bo_device *bdev, int resched)
671{
672 if (resched)
673 schedule_delayed_work(&bdev->wq,
674 ((HZ / 100) < 1) ? 1 : HZ / 100);
675}
676EXPORT_SYMBOL(ttm_bo_unlock_delayed_workqueue);
677
678static int ttm_bo_evict(struct ttm_buffer_object *bo, bool interruptible,
679 bool no_wait_gpu)
680{
681 struct ttm_bo_device *bdev = bo->bdev;
682 struct ttm_mem_reg evict_mem;
683 struct ttm_placement placement;
684 int ret = 0;
685
686 lockdep_assert_held(&bo->resv->lock.base);
687
688 evict_mem = bo->mem;
689 evict_mem.mm_node = NULL;
690 evict_mem.bus.io_reserved_vm = false;
691 evict_mem.bus.io_reserved_count = 0;
692
693 placement.num_placement = 0;
694 placement.num_busy_placement = 0;
695 bdev->driver->evict_flags(bo, &placement);
696 ret = ttm_bo_mem_space(bo, &placement, &evict_mem, interruptible,
697 no_wait_gpu);
698 if (ret) {
699 if (ret != -ERESTARTSYS) {
700 pr_err("Failed to find memory space for buffer 0x%p eviction\n",
701 bo);
702 ttm_bo_mem_space_debug(bo, &placement);
703 }
704 goto out;
705 }
706
707 ret = ttm_bo_handle_move_mem(bo, &evict_mem, true, interruptible,
708 no_wait_gpu);
709 if (unlikely(ret)) {
710 if (ret != -ERESTARTSYS)
711 pr_err("Buffer eviction failed\n");
712 ttm_bo_mem_put(bo, &evict_mem);
713 goto out;
714 }
715 bo->evicted = true;
716out:
717 return ret;
718}
719
720bool ttm_bo_eviction_valuable(struct ttm_buffer_object *bo,
721 const struct ttm_place *place)
722{
723 /* Don't evict this BO if it's outside of the
724 * requested placement range
725 */
726 if (place->fpfn >= (bo->mem.start + bo->mem.size) ||
727 (place->lpfn && place->lpfn <= bo->mem.start))
728 return false;
729
730 return true;
731}
732EXPORT_SYMBOL(ttm_bo_eviction_valuable);
733
734static int ttm_mem_evict_first(struct ttm_bo_device *bdev,
735 uint32_t mem_type,
736 const struct ttm_place *place,
737 bool interruptible,
738 bool no_wait_gpu)
739{
740 struct ttm_bo_global *glob = bdev->glob;
741 struct ttm_mem_type_manager *man = &bdev->man[mem_type];
742 struct ttm_buffer_object *bo;
743 int ret = -EBUSY, put_count;
744
745 spin_lock(&glob->lru_lock);
746 list_for_each_entry(bo, &man->lru, lru) {
747 ret = __ttm_bo_reserve(bo, false, true, NULL);
748 if (ret)
749 continue;
750
751 if (place && !bdev->driver->eviction_valuable(bo, place)) {
752 __ttm_bo_unreserve(bo);
753 ret = -EBUSY;
754 continue;
755 }
756
757 break;
758 }
759
760 if (ret) {
761 spin_unlock(&glob->lru_lock);
762 return ret;
763 }
764
765 kref_get(&bo->list_kref);
766
767 if (!list_empty(&bo->ddestroy)) {
768 ret = ttm_bo_cleanup_refs_and_unlock(bo, interruptible,
769 no_wait_gpu);
770 kref_put(&bo->list_kref, ttm_bo_release_list);
771 return ret;
772 }
773
774 put_count = ttm_bo_del_from_lru(bo);
775 spin_unlock(&glob->lru_lock);
776
777 BUG_ON(ret != 0);
778
779 ttm_bo_list_ref_sub(bo, put_count, true);
780
781 ret = ttm_bo_evict(bo, interruptible, no_wait_gpu);
782 ttm_bo_unreserve(bo);
783
784 kref_put(&bo->list_kref, ttm_bo_release_list);
785 return ret;
786}
787
788void ttm_bo_mem_put(struct ttm_buffer_object *bo, struct ttm_mem_reg *mem)
789{
790 struct ttm_mem_type_manager *man = &bo->bdev->man[mem->mem_type];
791
792 if (mem->mm_node)
793 (*man->func->put_node)(man, mem);
794}
795EXPORT_SYMBOL(ttm_bo_mem_put);
796
797/**
798 * Add the last move fence to the BO and reserve a new shared slot.
799 */
800static int ttm_bo_add_move_fence(struct ttm_buffer_object *bo,
801 struct ttm_mem_type_manager *man,
802 struct ttm_mem_reg *mem)
803{
804 struct dma_fence *fence;
805 int ret;
806
807 spin_lock(&man->move_lock);
808 fence = dma_fence_get(man->move);
809 spin_unlock(&man->move_lock);
810
811 if (fence) {
812 reservation_object_add_shared_fence(bo->resv, fence);
813
814 ret = reservation_object_reserve_shared(bo->resv);
815 if (unlikely(ret))
816 return ret;
817
818 dma_fence_put(bo->moving);
819 bo->moving = fence;
820 }
821
822 return 0;
823}
824
825/**
826 * Repeatedly evict memory from the LRU for @mem_type until we create enough
827 * space, or we've evicted everything and there isn't enough space.
828 */
829static int ttm_bo_mem_force_space(struct ttm_buffer_object *bo,
830 uint32_t mem_type,
831 const struct ttm_place *place,
832 struct ttm_mem_reg *mem,
833 bool interruptible,
834 bool no_wait_gpu)
835{
836 struct ttm_bo_device *bdev = bo->bdev;
837 struct ttm_mem_type_manager *man = &bdev->man[mem_type];
838 int ret;
839
840 do {
841 ret = (*man->func->get_node)(man, bo, place, mem);
842 if (unlikely(ret != 0))
843 return ret;
844 if (mem->mm_node)
845 break;
846 ret = ttm_mem_evict_first(bdev, mem_type, place,
847 interruptible, no_wait_gpu);
848 if (unlikely(ret != 0))
849 return ret;
850 } while (1);
851 mem->mem_type = mem_type;
852 return ttm_bo_add_move_fence(bo, man, mem);
853}
854
855static uint32_t ttm_bo_select_caching(struct ttm_mem_type_manager *man,
856 uint32_t cur_placement,
857 uint32_t proposed_placement)
858{
859 uint32_t caching = proposed_placement & TTM_PL_MASK_CACHING;
860 uint32_t result = proposed_placement & ~TTM_PL_MASK_CACHING;
861
862 /**
863 * Keep current caching if possible.
864 */
865
866 if ((cur_placement & caching) != 0)
867 result |= (cur_placement & caching);
868 else if ((man->default_caching & caching) != 0)
869 result |= man->default_caching;
870 else if ((TTM_PL_FLAG_CACHED & caching) != 0)
871 result |= TTM_PL_FLAG_CACHED;
872 else if ((TTM_PL_FLAG_WC & caching) != 0)
873 result |= TTM_PL_FLAG_WC;
874 else if ((TTM_PL_FLAG_UNCACHED & caching) != 0)
875 result |= TTM_PL_FLAG_UNCACHED;
876
877 return result;
878}
879
880static bool ttm_bo_mt_compatible(struct ttm_mem_type_manager *man,
881 uint32_t mem_type,
882 const struct ttm_place *place,
883 uint32_t *masked_placement)
884{
885 uint32_t cur_flags = ttm_bo_type_flags(mem_type);
886
887 if ((cur_flags & place->flags & TTM_PL_MASK_MEM) == 0)
888 return false;
889
890 if ((place->flags & man->available_caching) == 0)
891 return false;
892
893 cur_flags |= (place->flags & man->available_caching);
894
895 *masked_placement = cur_flags;
896 return true;
897}
898
899/**
900 * Creates space for memory region @mem according to its type.
901 *
902 * This function first searches for free space in compatible memory types in
903 * the priority order defined by the driver. If free space isn't found, then
904 * ttm_bo_mem_force_space is attempted in priority order to evict and find
905 * space.
906 */
907int ttm_bo_mem_space(struct ttm_buffer_object *bo,
908 struct ttm_placement *placement,
909 struct ttm_mem_reg *mem,
910 bool interruptible,
911 bool no_wait_gpu)
912{
913 struct ttm_bo_device *bdev = bo->bdev;
914 struct ttm_mem_type_manager *man;
915 uint32_t mem_type = TTM_PL_SYSTEM;
916 uint32_t cur_flags = 0;
917 bool type_found = false;
918 bool type_ok = false;
919 bool has_erestartsys = false;
920 int i, ret;
921
922 ret = reservation_object_reserve_shared(bo->resv);
923 if (unlikely(ret))
924 return ret;
925
926 mem->mm_node = NULL;
927 for (i = 0; i < placement->num_placement; ++i) {
928 const struct ttm_place *place = &placement->placement[i];
929
930 ret = ttm_mem_type_from_place(place, &mem_type);
931 if (ret)
932 return ret;
933 man = &bdev->man[mem_type];
934 if (!man->has_type || !man->use_type)
935 continue;
936
937 type_ok = ttm_bo_mt_compatible(man, mem_type, place,
938 &cur_flags);
939
940 if (!type_ok)
941 continue;
942
943 type_found = true;
944 cur_flags = ttm_bo_select_caching(man, bo->mem.placement,
945 cur_flags);
946 /*
947 * Use the access and other non-mapping-related flag bits from
948 * the memory placement flags to the current flags
949 */
950 ttm_flag_masked(&cur_flags, place->flags,
951 ~TTM_PL_MASK_MEMTYPE);
952
953 if (mem_type == TTM_PL_SYSTEM)
954 break;
955
956 ret = (*man->func->get_node)(man, bo, place, mem);
957 if (unlikely(ret))
958 return ret;
959
960 if (mem->mm_node) {
961 ret = ttm_bo_add_move_fence(bo, man, mem);
962 if (unlikely(ret)) {
963 (*man->func->put_node)(man, mem);
964 return ret;
965 }
966 break;
967 }
968 }
969
970 if ((type_ok && (mem_type == TTM_PL_SYSTEM)) || mem->mm_node) {
971 mem->mem_type = mem_type;
972 mem->placement = cur_flags;
973 return 0;
974 }
975
976 for (i = 0; i < placement->num_busy_placement; ++i) {
977 const struct ttm_place *place = &placement->busy_placement[i];
978
979 ret = ttm_mem_type_from_place(place, &mem_type);
980 if (ret)
981 return ret;
982 man = &bdev->man[mem_type];
983 if (!man->has_type || !man->use_type)
984 continue;
985 if (!ttm_bo_mt_compatible(man, mem_type, place, &cur_flags))
986 continue;
987
988 type_found = true;
989 cur_flags = ttm_bo_select_caching(man, bo->mem.placement,
990 cur_flags);
991 /*
992 * Use the access and other non-mapping-related flag bits from
993 * the memory placement flags to the current flags
994 */
995 ttm_flag_masked(&cur_flags, place->flags,
996 ~TTM_PL_MASK_MEMTYPE);
997
998 if (mem_type == TTM_PL_SYSTEM) {
999 mem->mem_type = mem_type;
1000 mem->placement = cur_flags;
1001 mem->mm_node = NULL;
1002 return 0;
1003 }
1004
1005 ret = ttm_bo_mem_force_space(bo, mem_type, place, mem,
1006 interruptible, no_wait_gpu);
1007 if (ret == 0 && mem->mm_node) {
1008 mem->placement = cur_flags;
1009 return 0;
1010 }
1011 if (ret == -ERESTARTSYS)
1012 has_erestartsys = true;
1013 }
1014
1015 if (!type_found) {
1016 printk(KERN_ERR TTM_PFX "No compatible memory type found.\n");
1017 return -EINVAL;
1018 }
1019
1020 return (has_erestartsys) ? -ERESTARTSYS : -ENOMEM;
1021}
1022EXPORT_SYMBOL(ttm_bo_mem_space);
1023
1024static int ttm_bo_move_buffer(struct ttm_buffer_object *bo,
1025 struct ttm_placement *placement,
1026 bool interruptible,
1027 bool no_wait_gpu)
1028{
1029 int ret = 0;
1030 struct ttm_mem_reg mem;
1031
1032 lockdep_assert_held(&bo->resv->lock.base);
1033
1034 mem.num_pages = bo->num_pages;
1035 mem.size = mem.num_pages << PAGE_SHIFT;
1036 mem.page_alignment = bo->mem.page_alignment;
1037 mem.bus.io_reserved_vm = false;
1038 mem.bus.io_reserved_count = 0;
1039 /*
1040 * Determine where to move the buffer.
1041 */
1042 ret = ttm_bo_mem_space(bo, placement, &mem,
1043 interruptible, no_wait_gpu);
1044 if (ret)
1045 goto out_unlock;
1046 ret = ttm_bo_handle_move_mem(bo, &mem, false,
1047 interruptible, no_wait_gpu);
1048out_unlock:
1049 if (ret && mem.mm_node)
1050 ttm_bo_mem_put(bo, &mem);
1051 return ret;
1052}
1053
1054bool ttm_bo_mem_compat(struct ttm_placement *placement,
1055 struct ttm_mem_reg *mem,
1056 uint32_t *new_flags)
1057{
1058 int i;
1059
1060 for (i = 0; i < placement->num_placement; i++) {
1061 const struct ttm_place *heap = &placement->placement[i];
1062 if (mem->mm_node &&
1063 (mem->start < heap->fpfn ||
1064 (heap->lpfn != 0 && (mem->start + mem->num_pages) > heap->lpfn)))
1065 continue;
1066
1067 *new_flags = heap->flags;
1068 if ((*new_flags & mem->placement & TTM_PL_MASK_CACHING) &&
1069 (*new_flags & mem->placement & TTM_PL_MASK_MEM))
1070 return true;
1071 }
1072
1073 for (i = 0; i < placement->num_busy_placement; i++) {
1074 const struct ttm_place *heap = &placement->busy_placement[i];
1075 if (mem->mm_node &&
1076 (mem->start < heap->fpfn ||
1077 (heap->lpfn != 0 && (mem->start + mem->num_pages) > heap->lpfn)))
1078 continue;
1079
1080 *new_flags = heap->flags;
1081 if ((*new_flags & mem->placement & TTM_PL_MASK_CACHING) &&
1082 (*new_flags & mem->placement & TTM_PL_MASK_MEM))
1083 return true;
1084 }
1085
1086 return false;
1087}
1088EXPORT_SYMBOL(ttm_bo_mem_compat);
1089
1090int ttm_bo_validate(struct ttm_buffer_object *bo,
1091 struct ttm_placement *placement,
1092 bool interruptible,
1093 bool no_wait_gpu)
1094{
1095 int ret;
1096 uint32_t new_flags;
1097
1098 lockdep_assert_held(&bo->resv->lock.base);
1099 /*
1100 * Check whether we need to move buffer.
1101 */
1102 if (!ttm_bo_mem_compat(placement, &bo->mem, &new_flags)) {
1103 ret = ttm_bo_move_buffer(bo, placement, interruptible,
1104 no_wait_gpu);
1105 if (ret)
1106 return ret;
1107 } else {
1108 /*
1109 * Use the access and other non-mapping-related flag bits from
1110 * the compatible memory placement flags to the active flags
1111 */
1112 ttm_flag_masked(&bo->mem.placement, new_flags,
1113 ~TTM_PL_MASK_MEMTYPE);
1114 }
1115 /*
1116 * We might need to add a TTM.
1117 */
1118 if (bo->mem.mem_type == TTM_PL_SYSTEM && bo->ttm == NULL) {
1119 ret = ttm_bo_add_ttm(bo, true);
1120 if (ret)
1121 return ret;
1122 }
1123 return 0;
1124}
1125EXPORT_SYMBOL(ttm_bo_validate);
1126
1127int ttm_bo_init(struct ttm_bo_device *bdev,
1128 struct ttm_buffer_object *bo,
1129 unsigned long size,
1130 enum ttm_bo_type type,
1131 struct ttm_placement *placement,
1132 uint32_t page_alignment,
1133 bool interruptible,
1134 struct file *persistent_swap_storage,
1135 size_t acc_size,
1136 struct sg_table *sg,
1137 struct reservation_object *resv,
1138 void (*destroy) (struct ttm_buffer_object *))
1139{
1140 int ret = 0;
1141 unsigned long num_pages;
1142 struct ttm_mem_global *mem_glob = bdev->glob->mem_glob;
1143 bool locked;
1144
1145 ret = ttm_mem_global_alloc(mem_glob, acc_size, false, false);
1146 if (ret) {
1147 pr_err("Out of kernel memory\n");
1148 if (destroy)
1149 (*destroy)(bo);
1150 else
1151 kfree(bo);
1152 return -ENOMEM;
1153 }
1154
1155 num_pages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
1156 if (num_pages == 0) {
1157 pr_err("Illegal buffer object size\n");
1158 if (destroy)
1159 (*destroy)(bo);
1160 else
1161 kfree(bo);
1162 ttm_mem_global_free(mem_glob, acc_size);
1163 return -EINVAL;
1164 }
1165 bo->destroy = destroy;
1166
1167 kref_init(&bo->kref);
1168 kref_init(&bo->list_kref);
1169 atomic_set(&bo->cpu_writers, 0);
1170 INIT_LIST_HEAD(&bo->lru);
1171 INIT_LIST_HEAD(&bo->ddestroy);
1172 INIT_LIST_HEAD(&bo->swap);
1173 INIT_LIST_HEAD(&bo->io_reserve_lru);
1174 mutex_init(&bo->wu_mutex);
1175 bo->bdev = bdev;
1176 bo->glob = bdev->glob;
1177 bo->type = type;
1178 bo->num_pages = num_pages;
1179 bo->mem.size = num_pages << PAGE_SHIFT;
1180 bo->mem.mem_type = TTM_PL_SYSTEM;
1181 bo->mem.num_pages = bo->num_pages;
1182 bo->mem.mm_node = NULL;
1183 bo->mem.page_alignment = page_alignment;
1184 bo->mem.bus.io_reserved_vm = false;
1185 bo->mem.bus.io_reserved_count = 0;
1186 bo->moving = NULL;
1187 bo->mem.placement = (TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED);
1188 bo->persistent_swap_storage = persistent_swap_storage;
1189 bo->acc_size = acc_size;
1190 bo->sg = sg;
1191 if (resv) {
1192 bo->resv = resv;
1193 lockdep_assert_held(&bo->resv->lock.base);
1194 } else {
1195 bo->resv = &bo->ttm_resv;
1196 reservation_object_init(&bo->ttm_resv);
1197 }
1198 atomic_inc(&bo->glob->bo_count);
1199 drm_vma_node_reset(&bo->vma_node);
1200
1201 /*
1202 * For ttm_bo_type_device buffers, allocate
1203 * address space from the device.
1204 */
1205 if (bo->type == ttm_bo_type_device ||
1206 bo->type == ttm_bo_type_sg)
1207 ret = drm_vma_offset_add(&bdev->vma_manager, &bo->vma_node,
1208 bo->mem.num_pages);
1209
1210 /* passed reservation objects should already be locked,
1211 * since otherwise lockdep will be angered in radeon.
1212 */
1213 if (!resv) {
1214 locked = ww_mutex_trylock(&bo->resv->lock);
1215 WARN_ON(!locked);
1216 }
1217
1218 if (likely(!ret))
1219 ret = ttm_bo_validate(bo, placement, interruptible, false);
1220
1221 if (!resv) {
1222 ttm_bo_unreserve(bo);
1223
1224 } else if (!(bo->mem.placement & TTM_PL_FLAG_NO_EVICT)) {
1225 spin_lock(&bo->glob->lru_lock);
1226 ttm_bo_add_to_lru(bo);
1227 spin_unlock(&bo->glob->lru_lock);
1228 }
1229
1230 if (unlikely(ret))
1231 ttm_bo_unref(&bo);
1232
1233 return ret;
1234}
1235EXPORT_SYMBOL(ttm_bo_init);
1236
1237size_t ttm_bo_acc_size(struct ttm_bo_device *bdev,
1238 unsigned long bo_size,
1239 unsigned struct_size)
1240{
1241 unsigned npages = (PAGE_ALIGN(bo_size)) >> PAGE_SHIFT;
1242 size_t size = 0;
1243
1244 size += ttm_round_pot(struct_size);
1245 size += ttm_round_pot(npages * sizeof(void *));
1246 size += ttm_round_pot(sizeof(struct ttm_tt));
1247 return size;
1248}
1249EXPORT_SYMBOL(ttm_bo_acc_size);
1250
1251size_t ttm_bo_dma_acc_size(struct ttm_bo_device *bdev,
1252 unsigned long bo_size,
1253 unsigned struct_size)
1254{
1255 unsigned npages = (PAGE_ALIGN(bo_size)) >> PAGE_SHIFT;
1256 size_t size = 0;
1257
1258 size += ttm_round_pot(struct_size);
1259 size += ttm_round_pot(npages * (2*sizeof(void *) + sizeof(dma_addr_t)));
1260 size += ttm_round_pot(sizeof(struct ttm_dma_tt));
1261 return size;
1262}
1263EXPORT_SYMBOL(ttm_bo_dma_acc_size);
1264
1265int ttm_bo_create(struct ttm_bo_device *bdev,
1266 unsigned long size,
1267 enum ttm_bo_type type,
1268 struct ttm_placement *placement,
1269 uint32_t page_alignment,
1270 bool interruptible,
1271 struct file *persistent_swap_storage,
1272 struct ttm_buffer_object **p_bo)
1273{
1274 struct ttm_buffer_object *bo;
1275 size_t acc_size;
1276 int ret;
1277
1278 bo = kzalloc(sizeof(*bo), GFP_KERNEL);
1279 if (unlikely(bo == NULL))
1280 return -ENOMEM;
1281
1282 acc_size = ttm_bo_acc_size(bdev, size, sizeof(struct ttm_buffer_object));
1283 ret = ttm_bo_init(bdev, bo, size, type, placement, page_alignment,
1284 interruptible, persistent_swap_storage, acc_size,
1285 NULL, NULL, NULL);
1286 if (likely(ret == 0))
1287 *p_bo = bo;
1288
1289 return ret;
1290}
1291EXPORT_SYMBOL(ttm_bo_create);
1292
1293static int ttm_bo_force_list_clean(struct ttm_bo_device *bdev,
1294 unsigned mem_type, bool allow_errors)
1295{
1296 struct ttm_mem_type_manager *man = &bdev->man[mem_type];
1297 struct ttm_bo_global *glob = bdev->glob;
1298 struct dma_fence *fence;
1299 int ret;
1300
1301 /*
1302 * Can't use standard list traversal since we're unlocking.
1303 */
1304
1305 spin_lock(&glob->lru_lock);
1306 while (!list_empty(&man->lru)) {
1307 spin_unlock(&glob->lru_lock);
1308 ret = ttm_mem_evict_first(bdev, mem_type, NULL, false, false);
1309 if (ret) {
1310 if (allow_errors) {
1311 return ret;
1312 } else {
1313 pr_err("Cleanup eviction failed\n");
1314 }
1315 }
1316 spin_lock(&glob->lru_lock);
1317 }
1318 spin_unlock(&glob->lru_lock);
1319
1320 spin_lock(&man->move_lock);
1321 fence = dma_fence_get(man->move);
1322 spin_unlock(&man->move_lock);
1323
1324 if (fence) {
1325 ret = dma_fence_wait(fence, false);
1326 dma_fence_put(fence);
1327 if (ret) {
1328 if (allow_errors) {
1329 return ret;
1330 } else {
1331 pr_err("Cleanup eviction failed\n");
1332 }
1333 }
1334 }
1335
1336 return 0;
1337}
1338
1339int ttm_bo_clean_mm(struct ttm_bo_device *bdev, unsigned mem_type)
1340{
1341 struct ttm_mem_type_manager *man;
1342 int ret = -EINVAL;
1343
1344 if (mem_type >= TTM_NUM_MEM_TYPES) {
1345 pr_err("Illegal memory type %d\n", mem_type);
1346 return ret;
1347 }
1348 man = &bdev->man[mem_type];
1349
1350 if (!man->has_type) {
1351 pr_err("Trying to take down uninitialized memory manager type %u\n",
1352 mem_type);
1353 return ret;
1354 }
1355 dma_fence_put(man->move);
1356
1357 man->use_type = false;
1358 man->has_type = false;
1359
1360 ret = 0;
1361 if (mem_type > 0) {
1362 ttm_bo_force_list_clean(bdev, mem_type, false);
1363
1364 ret = (*man->func->takedown)(man);
1365 }
1366
1367 return ret;
1368}
1369EXPORT_SYMBOL(ttm_bo_clean_mm);
1370
1371int ttm_bo_evict_mm(struct ttm_bo_device *bdev, unsigned mem_type)
1372{
1373 struct ttm_mem_type_manager *man = &bdev->man[mem_type];
1374
1375 if (mem_type == 0 || mem_type >= TTM_NUM_MEM_TYPES) {
1376 pr_err("Illegal memory manager memory type %u\n", mem_type);
1377 return -EINVAL;
1378 }
1379
1380 if (!man->has_type) {
1381 pr_err("Memory type %u has not been initialized\n", mem_type);
1382 return 0;
1383 }
1384
1385 return ttm_bo_force_list_clean(bdev, mem_type, true);
1386}
1387EXPORT_SYMBOL(ttm_bo_evict_mm);
1388
1389int ttm_bo_init_mm(struct ttm_bo_device *bdev, unsigned type,
1390 unsigned long p_size)
1391{
1392 int ret = -EINVAL;
1393 struct ttm_mem_type_manager *man;
1394
1395 BUG_ON(type >= TTM_NUM_MEM_TYPES);
1396 man = &bdev->man[type];
1397 BUG_ON(man->has_type);
1398 man->io_reserve_fastpath = true;
1399 man->use_io_reserve_lru = false;
1400 mutex_init(&man->io_reserve_mutex);
1401 spin_lock_init(&man->move_lock);
1402 INIT_LIST_HEAD(&man->io_reserve_lru);
1403
1404 ret = bdev->driver->init_mem_type(bdev, type, man);
1405 if (ret)
1406 return ret;
1407 man->bdev = bdev;
1408
1409 ret = 0;
1410 if (type != TTM_PL_SYSTEM) {
1411 ret = (*man->func->init)(man, p_size);
1412 if (ret)
1413 return ret;
1414 }
1415 man->has_type = true;
1416 man->use_type = true;
1417 man->size = p_size;
1418
1419 INIT_LIST_HEAD(&man->lru);
1420 man->move = NULL;
1421
1422 return 0;
1423}
1424EXPORT_SYMBOL(ttm_bo_init_mm);
1425
1426static void ttm_bo_global_kobj_release(struct kobject *kobj)
1427{
1428 struct ttm_bo_global *glob =
1429 container_of(kobj, struct ttm_bo_global, kobj);
1430
1431 ttm_mem_unregister_shrink(glob->mem_glob, &glob->shrink);
1432 __free_page(glob->dummy_read_page);
1433 kfree(glob);
1434}
1435
1436void ttm_bo_global_release(struct drm_global_reference *ref)
1437{
1438 struct ttm_bo_global *glob = ref->object;
1439
1440 kobject_del(&glob->kobj);
1441 kobject_put(&glob->kobj);
1442}
1443EXPORT_SYMBOL(ttm_bo_global_release);
1444
1445int ttm_bo_global_init(struct drm_global_reference *ref)
1446{
1447 struct ttm_bo_global_ref *bo_ref =
1448 container_of(ref, struct ttm_bo_global_ref, ref);
1449 struct ttm_bo_global *glob = ref->object;
1450 int ret;
1451
1452 mutex_init(&glob->device_list_mutex);
1453 spin_lock_init(&glob->lru_lock);
1454 glob->mem_glob = bo_ref->mem_glob;
1455 glob->dummy_read_page = alloc_page(__GFP_ZERO | GFP_DMA32);
1456
1457 if (unlikely(glob->dummy_read_page == NULL)) {
1458 ret = -ENOMEM;
1459 goto out_no_drp;
1460 }
1461
1462 INIT_LIST_HEAD(&glob->swap_lru);
1463 INIT_LIST_HEAD(&glob->device_list);
1464
1465 ttm_mem_init_shrink(&glob->shrink, ttm_bo_swapout);
1466 ret = ttm_mem_register_shrink(glob->mem_glob, &glob->shrink);
1467 if (unlikely(ret != 0)) {
1468 pr_err("Could not register buffer object swapout\n");
1469 goto out_no_shrink;
1470 }
1471
1472 atomic_set(&glob->bo_count, 0);
1473
1474 ret = kobject_init_and_add(
1475 &glob->kobj, &ttm_bo_glob_kobj_type, ttm_get_kobj(), "buffer_objects");
1476 if (unlikely(ret != 0))
1477 kobject_put(&glob->kobj);
1478 return ret;
1479out_no_shrink:
1480 __free_page(glob->dummy_read_page);
1481out_no_drp:
1482 kfree(glob);
1483 return ret;
1484}
1485EXPORT_SYMBOL(ttm_bo_global_init);
1486
1487
1488int ttm_bo_device_release(struct ttm_bo_device *bdev)
1489{
1490 int ret = 0;
1491 unsigned i = TTM_NUM_MEM_TYPES;
1492 struct ttm_mem_type_manager *man;
1493 struct ttm_bo_global *glob = bdev->glob;
1494
1495 while (i--) {
1496 man = &bdev->man[i];
1497 if (man->has_type) {
1498 man->use_type = false;
1499 if ((i != TTM_PL_SYSTEM) && ttm_bo_clean_mm(bdev, i)) {
1500 ret = -EBUSY;
1501 pr_err("DRM memory manager type %d is not clean\n",
1502 i);
1503 }
1504 man->has_type = false;
1505 }
1506 }
1507
1508 mutex_lock(&glob->device_list_mutex);
1509 list_del(&bdev->device_list);
1510 mutex_unlock(&glob->device_list_mutex);
1511
1512 cancel_delayed_work_sync(&bdev->wq);
1513
1514 while (ttm_bo_delayed_delete(bdev, true))
1515 ;
1516
1517 spin_lock(&glob->lru_lock);
1518 if (list_empty(&bdev->ddestroy))
1519 TTM_DEBUG("Delayed destroy list was clean\n");
1520
1521 if (list_empty(&bdev->man[0].lru))
1522 TTM_DEBUG("Swap list was clean\n");
1523 spin_unlock(&glob->lru_lock);
1524
1525 drm_vma_offset_manager_destroy(&bdev->vma_manager);
1526
1527 return ret;
1528}
1529EXPORT_SYMBOL(ttm_bo_device_release);
1530
1531int ttm_bo_device_init(struct ttm_bo_device *bdev,
1532 struct ttm_bo_global *glob,
1533 struct ttm_bo_driver *driver,
1534 struct address_space *mapping,
1535 uint64_t file_page_offset,
1536 bool need_dma32)
1537{
1538 int ret = -EINVAL;
1539
1540 bdev->driver = driver;
1541
1542 memset(bdev->man, 0, sizeof(bdev->man));
1543
1544 /*
1545 * Initialize the system memory buffer type.
1546 * Other types need to be driver / IOCTL initialized.
1547 */
1548 ret = ttm_bo_init_mm(bdev, TTM_PL_SYSTEM, 0);
1549 if (unlikely(ret != 0))
1550 goto out_no_sys;
1551
1552 drm_vma_offset_manager_init(&bdev->vma_manager, file_page_offset,
1553 0x10000000);
1554 INIT_DELAYED_WORK(&bdev->wq, ttm_bo_delayed_workqueue);
1555 INIT_LIST_HEAD(&bdev->ddestroy);
1556 bdev->dev_mapping = mapping;
1557 bdev->glob = glob;
1558 bdev->need_dma32 = need_dma32;
1559 mutex_lock(&glob->device_list_mutex);
1560 list_add_tail(&bdev->device_list, &glob->device_list);
1561 mutex_unlock(&glob->device_list_mutex);
1562
1563 return 0;
1564out_no_sys:
1565 return ret;
1566}
1567EXPORT_SYMBOL(ttm_bo_device_init);
1568
1569/*
1570 * buffer object vm functions.
1571 */
1572
1573bool ttm_mem_reg_is_pci(struct ttm_bo_device *bdev, struct ttm_mem_reg *mem)
1574{
1575 struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
1576
1577 if (!(man->flags & TTM_MEMTYPE_FLAG_FIXED)) {
1578 if (mem->mem_type == TTM_PL_SYSTEM)
1579 return false;
1580
1581 if (man->flags & TTM_MEMTYPE_FLAG_CMA)
1582 return false;
1583
1584 if (mem->placement & TTM_PL_FLAG_CACHED)
1585 return false;
1586 }
1587 return true;
1588}
1589
1590void ttm_bo_unmap_virtual_locked(struct ttm_buffer_object *bo)
1591{
1592 struct ttm_bo_device *bdev = bo->bdev;
1593
1594 drm_vma_node_unmap(&bo->vma_node, bdev->dev_mapping);
1595 ttm_mem_io_free_vm(bo);
1596}
1597
1598void ttm_bo_unmap_virtual(struct ttm_buffer_object *bo)
1599{
1600 struct ttm_bo_device *bdev = bo->bdev;
1601 struct ttm_mem_type_manager *man = &bdev->man[bo->mem.mem_type];
1602
1603 ttm_mem_io_lock(man, false);
1604 ttm_bo_unmap_virtual_locked(bo);
1605 ttm_mem_io_unlock(man);
1606}
1607
1608
1609EXPORT_SYMBOL(ttm_bo_unmap_virtual);
1610
1611int ttm_bo_wait(struct ttm_buffer_object *bo,
1612 bool interruptible, bool no_wait)
1613{
1614 long timeout = 15 * HZ;
1615
1616 if (no_wait) {
1617 if (reservation_object_test_signaled_rcu(bo->resv, true))
1618 return 0;
1619 else
1620 return -EBUSY;
1621 }
1622
1623 timeout = reservation_object_wait_timeout_rcu(bo->resv, true,
1624 interruptible, timeout);
1625 if (timeout < 0)
1626 return timeout;
1627
1628 if (timeout == 0)
1629 return -EBUSY;
1630
1631 reservation_object_add_excl_fence(bo->resv, NULL);
1632 return 0;
1633}
1634EXPORT_SYMBOL(ttm_bo_wait);
1635
1636int ttm_bo_synccpu_write_grab(struct ttm_buffer_object *bo, bool no_wait)
1637{
1638 int ret = 0;
1639
1640 /*
1641 * Using ttm_bo_reserve makes sure the lru lists are updated.
1642 */
1643
1644 ret = ttm_bo_reserve(bo, true, no_wait, NULL);
1645 if (unlikely(ret != 0))
1646 return ret;
1647 ret = ttm_bo_wait(bo, true, no_wait);
1648 if (likely(ret == 0))
1649 atomic_inc(&bo->cpu_writers);
1650 ttm_bo_unreserve(bo);
1651 return ret;
1652}
1653EXPORT_SYMBOL(ttm_bo_synccpu_write_grab);
1654
1655void ttm_bo_synccpu_write_release(struct ttm_buffer_object *bo)
1656{
1657 atomic_dec(&bo->cpu_writers);
1658}
1659EXPORT_SYMBOL(ttm_bo_synccpu_write_release);
1660
1661/**
1662 * A buffer object shrink method that tries to swap out the first
1663 * buffer object on the bo_global::swap_lru list.
1664 */
1665
1666static int ttm_bo_swapout(struct ttm_mem_shrink *shrink)
1667{
1668 struct ttm_bo_global *glob =
1669 container_of(shrink, struct ttm_bo_global, shrink);
1670 struct ttm_buffer_object *bo;
1671 int ret = -EBUSY;
1672 int put_count;
1673
1674 spin_lock(&glob->lru_lock);
1675 list_for_each_entry(bo, &glob->swap_lru, swap) {
1676 ret = __ttm_bo_reserve(bo, false, true, NULL);
1677 if (!ret)
1678 break;
1679 }
1680
1681 if (ret) {
1682 spin_unlock(&glob->lru_lock);
1683 return ret;
1684 }
1685
1686 kref_get(&bo->list_kref);
1687
1688 if (!list_empty(&bo->ddestroy)) {
1689 ret = ttm_bo_cleanup_refs_and_unlock(bo, false, false);
1690 kref_put(&bo->list_kref, ttm_bo_release_list);
1691 return ret;
1692 }
1693
1694 put_count = ttm_bo_del_from_lru(bo);
1695 spin_unlock(&glob->lru_lock);
1696
1697 ttm_bo_list_ref_sub(bo, put_count, true);
1698
1699 /**
1700 * Move to system cached
1701 */
1702
1703 if (bo->mem.mem_type != TTM_PL_SYSTEM ||
1704 bo->ttm->caching_state != tt_cached) {
1705 struct ttm_mem_reg evict_mem;
1706
1707 evict_mem = bo->mem;
1708 evict_mem.mm_node = NULL;
1709 evict_mem.placement = TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED;
1710 evict_mem.mem_type = TTM_PL_SYSTEM;
1711
1712 ret = ttm_bo_handle_move_mem(bo, &evict_mem, true,
1713 false, false);
1714 if (unlikely(ret != 0))
1715 goto out;
1716 }
1717
1718 /**
1719 * Make sure BO is idle.
1720 */
1721
1722 ret = ttm_bo_wait(bo, false, false);
1723 if (unlikely(ret != 0))
1724 goto out;
1725
1726 ttm_bo_unmap_virtual(bo);
1727
1728 /**
1729 * Swap out. Buffer will be swapped in again as soon as
1730 * anyone tries to access a ttm page.
1731 */
1732
1733 if (bo->bdev->driver->swap_notify)
1734 bo->bdev->driver->swap_notify(bo);
1735
1736 ret = ttm_tt_swapout(bo->ttm, bo->persistent_swap_storage);
1737out:
1738
1739 /**
1740 *
1741 * Unreserve without putting on LRU to avoid swapping out an
1742 * already swapped buffer.
1743 */
1744
1745 __ttm_bo_unreserve(bo);
1746 kref_put(&bo->list_kref, ttm_bo_release_list);
1747 return ret;
1748}
1749
1750void ttm_bo_swapout_all(struct ttm_bo_device *bdev)
1751{
1752 while (ttm_bo_swapout(&bdev->glob->shrink) == 0)
1753 ;
1754}
1755EXPORT_SYMBOL(ttm_bo_swapout_all);
1756
1757/**
1758 * ttm_bo_wait_unreserved - interruptible wait for a buffer object to become
1759 * unreserved
1760 *
1761 * @bo: Pointer to buffer
1762 */
1763int ttm_bo_wait_unreserved(struct ttm_buffer_object *bo)
1764{
1765 int ret;
1766
1767 /*
1768 * In the absense of a wait_unlocked API,
1769 * Use the bo::wu_mutex to avoid triggering livelocks due to
1770 * concurrent use of this function. Note that this use of
1771 * bo::wu_mutex can go away if we change locking order to
1772 * mmap_sem -> bo::reserve.
1773 */
1774 ret = mutex_lock_interruptible(&bo->wu_mutex);
1775 if (unlikely(ret != 0))
1776 return -ERESTARTSYS;
1777 if (!ww_mutex_is_locked(&bo->resv->lock))
1778 goto out_unlock;
1779 ret = __ttm_bo_reserve(bo, true, false, NULL);
1780 if (unlikely(ret != 0))
1781 goto out_unlock;
1782 __ttm_bo_unreserve(bo);
1783
1784out_unlock:
1785 mutex_unlock(&bo->wu_mutex);
1786 return ret;
1787}