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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
45static void ttm_bo_global_kobj_release(struct kobject *kobj);
46
47static struct attribute ttm_bo_count = {
48 .name = "bo_count",
49 .mode = S_IRUGO
50};
51
52/* default destructor */
53static void ttm_bo_default_destroy(struct ttm_buffer_object *bo)
54{
55 kfree(bo);
56}
57
58static inline int ttm_mem_type_from_place(const struct ttm_place *place,
59 uint32_t *mem_type)
60{
61 int pos;
62
63 pos = ffs(place->flags & TTM_PL_MASK_MEM);
64 if (unlikely(!pos))
65 return -EINVAL;
66
67 *mem_type = pos - 1;
68 return 0;
69}
70
71static void ttm_mem_type_debug(struct ttm_bo_device *bdev, int mem_type)
72{
73 struct ttm_mem_type_manager *man = &bdev->man[mem_type];
74 struct drm_printer p = drm_debug_printer(TTM_PFX);
75
76 pr_err(" has_type: %d\n", man->has_type);
77 pr_err(" use_type: %d\n", man->use_type);
78 pr_err(" flags: 0x%08X\n", man->flags);
79 pr_err(" gpu_offset: 0x%08llX\n", man->gpu_offset);
80 pr_err(" size: %llu\n", man->size);
81 pr_err(" available_caching: 0x%08X\n", man->available_caching);
82 pr_err(" default_caching: 0x%08X\n", man->default_caching);
83 if (mem_type != TTM_PL_SYSTEM)
84 (*man->func->debug)(man, &p);
85}
86
87static void ttm_bo_mem_space_debug(struct ttm_buffer_object *bo,
88 struct ttm_placement *placement)
89{
90 int i, ret, mem_type;
91
92 pr_err("No space for %p (%lu pages, %luK, %luM)\n",
93 bo, bo->mem.num_pages, bo->mem.size >> 10,
94 bo->mem.size >> 20);
95 for (i = 0; i < placement->num_placement; i++) {
96 ret = ttm_mem_type_from_place(&placement->placement[i],
97 &mem_type);
98 if (ret)
99 return;
100 pr_err(" placement[%d]=0x%08X (%d)\n",
101 i, placement->placement[i].flags, mem_type);
102 ttm_mem_type_debug(bo->bdev, mem_type);
103 }
104}
105
106static ssize_t ttm_bo_global_show(struct kobject *kobj,
107 struct attribute *attr,
108 char *buffer)
109{
110 struct ttm_bo_global *glob =
111 container_of(kobj, struct ttm_bo_global, kobj);
112
113 return snprintf(buffer, PAGE_SIZE, "%d\n",
114 atomic_read(&glob->bo_count));
115}
116
117static struct attribute *ttm_bo_global_attrs[] = {
118 &ttm_bo_count,
119 NULL
120};
121
122static const struct sysfs_ops ttm_bo_global_ops = {
123 .show = &ttm_bo_global_show
124};
125
126static struct kobj_type ttm_bo_glob_kobj_type = {
127 .release = &ttm_bo_global_kobj_release,
128 .sysfs_ops = &ttm_bo_global_ops,
129 .default_attrs = ttm_bo_global_attrs
130};
131
132
133static inline uint32_t ttm_bo_type_flags(unsigned type)
134{
135 return 1 << (type);
136}
137
138static void ttm_bo_release_list(struct kref *list_kref)
139{
140 struct ttm_buffer_object *bo =
141 container_of(list_kref, struct ttm_buffer_object, list_kref);
142 struct ttm_bo_device *bdev = bo->bdev;
143 size_t acc_size = bo->acc_size;
144
145 BUG_ON(kref_read(&bo->list_kref));
146 BUG_ON(kref_read(&bo->kref));
147 BUG_ON(atomic_read(&bo->cpu_writers));
148 BUG_ON(bo->mem.mm_node != NULL);
149 BUG_ON(!list_empty(&bo->lru));
150 BUG_ON(!list_empty(&bo->ddestroy));
151 ttm_tt_destroy(bo->ttm);
152 atomic_dec(&bo->bdev->glob->bo_count);
153 dma_fence_put(bo->moving);
154 reservation_object_fini(&bo->ttm_resv);
155 mutex_destroy(&bo->wu_mutex);
156 bo->destroy(bo);
157 ttm_mem_global_free(bdev->glob->mem_glob, acc_size);
158}
159
160void ttm_bo_add_to_lru(struct ttm_buffer_object *bo)
161{
162 struct ttm_bo_device *bdev = bo->bdev;
163 struct ttm_mem_type_manager *man;
164
165 reservation_object_assert_held(bo->resv);
166
167 if (!(bo->mem.placement & TTM_PL_FLAG_NO_EVICT)) {
168 BUG_ON(!list_empty(&bo->lru));
169
170 man = &bdev->man[bo->mem.mem_type];
171 list_add_tail(&bo->lru, &man->lru[bo->priority]);
172 kref_get(&bo->list_kref);
173
174 if (bo->ttm && !(bo->ttm->page_flags &
175 (TTM_PAGE_FLAG_SG | TTM_PAGE_FLAG_SWAPPED))) {
176 list_add_tail(&bo->swap,
177 &bdev->glob->swap_lru[bo->priority]);
178 kref_get(&bo->list_kref);
179 }
180 }
181}
182EXPORT_SYMBOL(ttm_bo_add_to_lru);
183
184static void ttm_bo_ref_bug(struct kref *list_kref)
185{
186 BUG();
187}
188
189void ttm_bo_del_from_lru(struct ttm_buffer_object *bo)
190{
191 if (!list_empty(&bo->swap)) {
192 list_del_init(&bo->swap);
193 kref_put(&bo->list_kref, ttm_bo_ref_bug);
194 }
195 if (!list_empty(&bo->lru)) {
196 list_del_init(&bo->lru);
197 kref_put(&bo->list_kref, ttm_bo_ref_bug);
198 }
199
200 /*
201 * TODO: Add a driver hook to delete from
202 * driver-specific LRU's here.
203 */
204}
205
206void ttm_bo_del_sub_from_lru(struct ttm_buffer_object *bo)
207{
208 struct ttm_bo_global *glob = bo->bdev->glob;
209
210 spin_lock(&glob->lru_lock);
211 ttm_bo_del_from_lru(bo);
212 spin_unlock(&glob->lru_lock);
213}
214EXPORT_SYMBOL(ttm_bo_del_sub_from_lru);
215
216void ttm_bo_move_to_lru_tail(struct ttm_buffer_object *bo)
217{
218 reservation_object_assert_held(bo->resv);
219
220 ttm_bo_del_from_lru(bo);
221 ttm_bo_add_to_lru(bo);
222}
223EXPORT_SYMBOL(ttm_bo_move_to_lru_tail);
224
225static int ttm_bo_handle_move_mem(struct ttm_buffer_object *bo,
226 struct ttm_mem_reg *mem, bool evict,
227 struct ttm_operation_ctx *ctx)
228{
229 struct ttm_bo_device *bdev = bo->bdev;
230 bool old_is_pci = ttm_mem_reg_is_pci(bdev, &bo->mem);
231 bool new_is_pci = ttm_mem_reg_is_pci(bdev, mem);
232 struct ttm_mem_type_manager *old_man = &bdev->man[bo->mem.mem_type];
233 struct ttm_mem_type_manager *new_man = &bdev->man[mem->mem_type];
234 int ret = 0;
235
236 if (old_is_pci || new_is_pci ||
237 ((mem->placement & bo->mem.placement & TTM_PL_MASK_CACHING) == 0)) {
238 ret = ttm_mem_io_lock(old_man, true);
239 if (unlikely(ret != 0))
240 goto out_err;
241 ttm_bo_unmap_virtual_locked(bo);
242 ttm_mem_io_unlock(old_man);
243 }
244
245 /*
246 * Create and bind a ttm if required.
247 */
248
249 if (!(new_man->flags & TTM_MEMTYPE_FLAG_FIXED)) {
250 if (bo->ttm == NULL) {
251 bool zero = !(old_man->flags & TTM_MEMTYPE_FLAG_FIXED);
252 ret = ttm_tt_create(bo, zero);
253 if (ret)
254 goto out_err;
255 }
256
257 ret = ttm_tt_set_placement_caching(bo->ttm, mem->placement);
258 if (ret)
259 goto out_err;
260
261 if (mem->mem_type != TTM_PL_SYSTEM) {
262 ret = ttm_tt_bind(bo->ttm, mem, ctx);
263 if (ret)
264 goto out_err;
265 }
266
267 if (bo->mem.mem_type == TTM_PL_SYSTEM) {
268 if (bdev->driver->move_notify)
269 bdev->driver->move_notify(bo, evict, mem);
270 bo->mem = *mem;
271 mem->mm_node = NULL;
272 goto moved;
273 }
274 }
275
276 if (bdev->driver->move_notify)
277 bdev->driver->move_notify(bo, evict, mem);
278
279 if (!(old_man->flags & TTM_MEMTYPE_FLAG_FIXED) &&
280 !(new_man->flags & TTM_MEMTYPE_FLAG_FIXED))
281 ret = ttm_bo_move_ttm(bo, ctx, mem);
282 else if (bdev->driver->move)
283 ret = bdev->driver->move(bo, evict, ctx, mem);
284 else
285 ret = ttm_bo_move_memcpy(bo, ctx, mem);
286
287 if (ret) {
288 if (bdev->driver->move_notify) {
289 struct ttm_mem_reg tmp_mem = *mem;
290 *mem = bo->mem;
291 bo->mem = tmp_mem;
292 bdev->driver->move_notify(bo, false, mem);
293 bo->mem = *mem;
294 *mem = tmp_mem;
295 }
296
297 goto out_err;
298 }
299
300moved:
301 if (bo->evicted) {
302 if (bdev->driver->invalidate_caches) {
303 ret = bdev->driver->invalidate_caches(bdev, bo->mem.placement);
304 if (ret)
305 pr_err("Can not flush read caches\n");
306 }
307 bo->evicted = false;
308 }
309
310 if (bo->mem.mm_node)
311 bo->offset = (bo->mem.start << PAGE_SHIFT) +
312 bdev->man[bo->mem.mem_type].gpu_offset;
313 else
314 bo->offset = 0;
315
316 ctx->bytes_moved += bo->num_pages << PAGE_SHIFT;
317 return 0;
318
319out_err:
320 new_man = &bdev->man[bo->mem.mem_type];
321 if (new_man->flags & TTM_MEMTYPE_FLAG_FIXED) {
322 ttm_tt_destroy(bo->ttm);
323 bo->ttm = NULL;
324 }
325
326 return ret;
327}
328
329/**
330 * Call bo::reserved.
331 * Will release GPU memory type usage on destruction.
332 * This is the place to put in driver specific hooks to release
333 * driver private resources.
334 * Will release the bo::reserved lock.
335 */
336
337static void ttm_bo_cleanup_memtype_use(struct ttm_buffer_object *bo)
338{
339 if (bo->bdev->driver->move_notify)
340 bo->bdev->driver->move_notify(bo, false, NULL);
341
342 ttm_tt_destroy(bo->ttm);
343 bo->ttm = NULL;
344 ttm_bo_mem_put(bo, &bo->mem);
345}
346
347static int ttm_bo_individualize_resv(struct ttm_buffer_object *bo)
348{
349 int r;
350
351 if (bo->resv == &bo->ttm_resv)
352 return 0;
353
354 BUG_ON(!reservation_object_trylock(&bo->ttm_resv));
355
356 r = reservation_object_copy_fences(&bo->ttm_resv, bo->resv);
357 if (r)
358 reservation_object_unlock(&bo->ttm_resv);
359
360 return r;
361}
362
363static void ttm_bo_flush_all_fences(struct ttm_buffer_object *bo)
364{
365 struct reservation_object_list *fobj;
366 struct dma_fence *fence;
367 int i;
368
369 fobj = reservation_object_get_list(&bo->ttm_resv);
370 fence = reservation_object_get_excl(&bo->ttm_resv);
371 if (fence && !fence->ops->signaled)
372 dma_fence_enable_sw_signaling(fence);
373
374 for (i = 0; fobj && i < fobj->shared_count; ++i) {
375 fence = rcu_dereference_protected(fobj->shared[i],
376 reservation_object_held(bo->resv));
377
378 if (!fence->ops->signaled)
379 dma_fence_enable_sw_signaling(fence);
380 }
381}
382
383static void ttm_bo_cleanup_refs_or_queue(struct ttm_buffer_object *bo)
384{
385 struct ttm_bo_device *bdev = bo->bdev;
386 struct ttm_bo_global *glob = bdev->glob;
387 int ret;
388
389 ret = ttm_bo_individualize_resv(bo);
390 if (ret) {
391 /* Last resort, if we fail to allocate memory for the
392 * fences block for the BO to become idle
393 */
394 reservation_object_wait_timeout_rcu(bo->resv, true, false,
395 30 * HZ);
396 spin_lock(&glob->lru_lock);
397 goto error;
398 }
399
400 spin_lock(&glob->lru_lock);
401 ret = reservation_object_trylock(bo->resv) ? 0 : -EBUSY;
402 if (!ret) {
403 if (reservation_object_test_signaled_rcu(&bo->ttm_resv, true)) {
404 ttm_bo_del_from_lru(bo);
405 spin_unlock(&glob->lru_lock);
406 if (bo->resv != &bo->ttm_resv)
407 reservation_object_unlock(&bo->ttm_resv);
408
409 ttm_bo_cleanup_memtype_use(bo);
410 reservation_object_unlock(bo->resv);
411 return;
412 }
413
414 ttm_bo_flush_all_fences(bo);
415
416 /*
417 * Make NO_EVICT bos immediately available to
418 * shrinkers, now that they are queued for
419 * destruction.
420 */
421 if (bo->mem.placement & TTM_PL_FLAG_NO_EVICT) {
422 bo->mem.placement &= ~TTM_PL_FLAG_NO_EVICT;
423 ttm_bo_add_to_lru(bo);
424 }
425
426 reservation_object_unlock(bo->resv);
427 }
428 if (bo->resv != &bo->ttm_resv)
429 reservation_object_unlock(&bo->ttm_resv);
430
431error:
432 kref_get(&bo->list_kref);
433 list_add_tail(&bo->ddestroy, &bdev->ddestroy);
434 spin_unlock(&glob->lru_lock);
435
436 schedule_delayed_work(&bdev->wq,
437 ((HZ / 100) < 1) ? 1 : HZ / 100);
438}
439
440/**
441 * function ttm_bo_cleanup_refs
442 * If bo idle, remove from delayed- and lru lists, and unref.
443 * If not idle, do nothing.
444 *
445 * Must be called with lru_lock and reservation held, this function
446 * will drop the lru lock and optionally the reservation lock before returning.
447 *
448 * @interruptible Any sleeps should occur interruptibly.
449 * @no_wait_gpu Never wait for gpu. Return -EBUSY instead.
450 * @unlock_resv Unlock the reservation lock as well.
451 */
452
453static int ttm_bo_cleanup_refs(struct ttm_buffer_object *bo,
454 bool interruptible, bool no_wait_gpu,
455 bool unlock_resv)
456{
457 struct ttm_bo_global *glob = bo->bdev->glob;
458 struct reservation_object *resv;
459 int ret;
460
461 if (unlikely(list_empty(&bo->ddestroy)))
462 resv = bo->resv;
463 else
464 resv = &bo->ttm_resv;
465
466 if (reservation_object_test_signaled_rcu(resv, true))
467 ret = 0;
468 else
469 ret = -EBUSY;
470
471 if (ret && !no_wait_gpu) {
472 long lret;
473
474 if (unlock_resv)
475 reservation_object_unlock(bo->resv);
476 spin_unlock(&glob->lru_lock);
477
478 lret = reservation_object_wait_timeout_rcu(resv, true,
479 interruptible,
480 30 * HZ);
481
482 if (lret < 0)
483 return lret;
484 else if (lret == 0)
485 return -EBUSY;
486
487 spin_lock(&glob->lru_lock);
488 if (unlock_resv && !reservation_object_trylock(bo->resv)) {
489 /*
490 * We raced, and lost, someone else holds the reservation now,
491 * and is probably busy in ttm_bo_cleanup_memtype_use.
492 *
493 * Even if it's not the case, because we finished waiting any
494 * delayed destruction would succeed, so just return success
495 * here.
496 */
497 spin_unlock(&glob->lru_lock);
498 return 0;
499 }
500 ret = 0;
501 }
502
503 if (ret || unlikely(list_empty(&bo->ddestroy))) {
504 if (unlock_resv)
505 reservation_object_unlock(bo->resv);
506 spin_unlock(&glob->lru_lock);
507 return ret;
508 }
509
510 ttm_bo_del_from_lru(bo);
511 list_del_init(&bo->ddestroy);
512 kref_put(&bo->list_kref, ttm_bo_ref_bug);
513
514 spin_unlock(&glob->lru_lock);
515 ttm_bo_cleanup_memtype_use(bo);
516
517 if (unlock_resv)
518 reservation_object_unlock(bo->resv);
519
520 return 0;
521}
522
523/**
524 * Traverse the delayed list, and call ttm_bo_cleanup_refs on all
525 * encountered buffers.
526 */
527static bool ttm_bo_delayed_delete(struct ttm_bo_device *bdev, bool remove_all)
528{
529 struct ttm_bo_global *glob = bdev->glob;
530 struct list_head removed;
531 bool empty;
532
533 INIT_LIST_HEAD(&removed);
534
535 spin_lock(&glob->lru_lock);
536 while (!list_empty(&bdev->ddestroy)) {
537 struct ttm_buffer_object *bo;
538
539 bo = list_first_entry(&bdev->ddestroy, struct ttm_buffer_object,
540 ddestroy);
541 kref_get(&bo->list_kref);
542 list_move_tail(&bo->ddestroy, &removed);
543
544 if (remove_all || bo->resv != &bo->ttm_resv) {
545 spin_unlock(&glob->lru_lock);
546 reservation_object_lock(bo->resv, NULL);
547
548 spin_lock(&glob->lru_lock);
549 ttm_bo_cleanup_refs(bo, false, !remove_all, true);
550
551 } else if (reservation_object_trylock(bo->resv)) {
552 ttm_bo_cleanup_refs(bo, false, !remove_all, true);
553 } else {
554 spin_unlock(&glob->lru_lock);
555 }
556
557 kref_put(&bo->list_kref, ttm_bo_release_list);
558 spin_lock(&glob->lru_lock);
559 }
560 list_splice_tail(&removed, &bdev->ddestroy);
561 empty = list_empty(&bdev->ddestroy);
562 spin_unlock(&glob->lru_lock);
563
564 return empty;
565}
566
567static void ttm_bo_delayed_workqueue(struct work_struct *work)
568{
569 struct ttm_bo_device *bdev =
570 container_of(work, struct ttm_bo_device, wq.work);
571
572 if (!ttm_bo_delayed_delete(bdev, false))
573 schedule_delayed_work(&bdev->wq,
574 ((HZ / 100) < 1) ? 1 : HZ / 100);
575}
576
577static void ttm_bo_release(struct kref *kref)
578{
579 struct ttm_buffer_object *bo =
580 container_of(kref, struct ttm_buffer_object, kref);
581 struct ttm_bo_device *bdev = bo->bdev;
582 struct ttm_mem_type_manager *man = &bdev->man[bo->mem.mem_type];
583
584 drm_vma_offset_remove(&bdev->vma_manager, &bo->vma_node);
585 ttm_mem_io_lock(man, false);
586 ttm_mem_io_free_vm(bo);
587 ttm_mem_io_unlock(man);
588 ttm_bo_cleanup_refs_or_queue(bo);
589 kref_put(&bo->list_kref, ttm_bo_release_list);
590}
591
592void ttm_bo_unref(struct ttm_buffer_object **p_bo)
593{
594 struct ttm_buffer_object *bo = *p_bo;
595
596 *p_bo = NULL;
597 kref_put(&bo->kref, ttm_bo_release);
598}
599EXPORT_SYMBOL(ttm_bo_unref);
600
601int ttm_bo_lock_delayed_workqueue(struct ttm_bo_device *bdev)
602{
603 return cancel_delayed_work_sync(&bdev->wq);
604}
605EXPORT_SYMBOL(ttm_bo_lock_delayed_workqueue);
606
607void ttm_bo_unlock_delayed_workqueue(struct ttm_bo_device *bdev, int resched)
608{
609 if (resched)
610 schedule_delayed_work(&bdev->wq,
611 ((HZ / 100) < 1) ? 1 : HZ / 100);
612}
613EXPORT_SYMBOL(ttm_bo_unlock_delayed_workqueue);
614
615static int ttm_bo_evict(struct ttm_buffer_object *bo,
616 struct ttm_operation_ctx *ctx)
617{
618 struct ttm_bo_device *bdev = bo->bdev;
619 struct ttm_mem_reg evict_mem;
620 struct ttm_placement placement;
621 int ret = 0;
622
623 reservation_object_assert_held(bo->resv);
624
625 placement.num_placement = 0;
626 placement.num_busy_placement = 0;
627 bdev->driver->evict_flags(bo, &placement);
628
629 if (!placement.num_placement && !placement.num_busy_placement) {
630 ret = ttm_bo_pipeline_gutting(bo);
631 if (ret)
632 return ret;
633
634 return ttm_tt_create(bo, false);
635 }
636
637 evict_mem = bo->mem;
638 evict_mem.mm_node = NULL;
639 evict_mem.bus.io_reserved_vm = false;
640 evict_mem.bus.io_reserved_count = 0;
641
642 ret = ttm_bo_mem_space(bo, &placement, &evict_mem, ctx);
643 if (ret) {
644 if (ret != -ERESTARTSYS) {
645 pr_err("Failed to find memory space for buffer 0x%p eviction\n",
646 bo);
647 ttm_bo_mem_space_debug(bo, &placement);
648 }
649 goto out;
650 }
651
652 ret = ttm_bo_handle_move_mem(bo, &evict_mem, true, ctx);
653 if (unlikely(ret)) {
654 if (ret != -ERESTARTSYS)
655 pr_err("Buffer eviction failed\n");
656 ttm_bo_mem_put(bo, &evict_mem);
657 goto out;
658 }
659 bo->evicted = true;
660out:
661 return ret;
662}
663
664bool ttm_bo_eviction_valuable(struct ttm_buffer_object *bo,
665 const struct ttm_place *place)
666{
667 /* Don't evict this BO if it's outside of the
668 * requested placement range
669 */
670 if (place->fpfn >= (bo->mem.start + bo->mem.size) ||
671 (place->lpfn && place->lpfn <= bo->mem.start))
672 return false;
673
674 return true;
675}
676EXPORT_SYMBOL(ttm_bo_eviction_valuable);
677
678/**
679 * Check the target bo is allowable to be evicted or swapout, including cases:
680 *
681 * a. if share same reservation object with ctx->resv, have assumption
682 * reservation objects should already be locked, so not lock again and
683 * return true directly when either the opreation allow_reserved_eviction
684 * or the target bo already is in delayed free list;
685 *
686 * b. Otherwise, trylock it.
687 */
688static bool ttm_bo_evict_swapout_allowable(struct ttm_buffer_object *bo,
689 struct ttm_operation_ctx *ctx, bool *locked)
690{
691 bool ret = false;
692
693 *locked = false;
694 if (bo->resv == ctx->resv) {
695 reservation_object_assert_held(bo->resv);
696 if (ctx->flags & TTM_OPT_FLAG_ALLOW_RES_EVICT
697 || !list_empty(&bo->ddestroy))
698 ret = true;
699 } else {
700 *locked = reservation_object_trylock(bo->resv);
701 ret = *locked;
702 }
703
704 return ret;
705}
706
707static int ttm_mem_evict_first(struct ttm_bo_device *bdev,
708 uint32_t mem_type,
709 const struct ttm_place *place,
710 struct ttm_operation_ctx *ctx)
711{
712 struct ttm_bo_global *glob = bdev->glob;
713 struct ttm_mem_type_manager *man = &bdev->man[mem_type];
714 struct ttm_buffer_object *bo = NULL;
715 bool locked = false;
716 unsigned i;
717 int ret;
718
719 spin_lock(&glob->lru_lock);
720 for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i) {
721 list_for_each_entry(bo, &man->lru[i], lru) {
722 if (!ttm_bo_evict_swapout_allowable(bo, ctx, &locked))
723 continue;
724
725 if (place && !bdev->driver->eviction_valuable(bo,
726 place)) {
727 if (locked)
728 reservation_object_unlock(bo->resv);
729 continue;
730 }
731 break;
732 }
733
734 /* If the inner loop terminated early, we have our candidate */
735 if (&bo->lru != &man->lru[i])
736 break;
737
738 bo = NULL;
739 }
740
741 if (!bo) {
742 spin_unlock(&glob->lru_lock);
743 return -EBUSY;
744 }
745
746 kref_get(&bo->list_kref);
747
748 if (!list_empty(&bo->ddestroy)) {
749 ret = ttm_bo_cleanup_refs(bo, ctx->interruptible,
750 ctx->no_wait_gpu, locked);
751 kref_put(&bo->list_kref, ttm_bo_release_list);
752 return ret;
753 }
754
755 ttm_bo_del_from_lru(bo);
756 spin_unlock(&glob->lru_lock);
757
758 ret = ttm_bo_evict(bo, ctx);
759 if (locked) {
760 ttm_bo_unreserve(bo);
761 } else {
762 spin_lock(&glob->lru_lock);
763 ttm_bo_add_to_lru(bo);
764 spin_unlock(&glob->lru_lock);
765 }
766
767 kref_put(&bo->list_kref, ttm_bo_release_list);
768 return ret;
769}
770
771void ttm_bo_mem_put(struct ttm_buffer_object *bo, struct ttm_mem_reg *mem)
772{
773 struct ttm_mem_type_manager *man = &bo->bdev->man[mem->mem_type];
774
775 if (mem->mm_node)
776 (*man->func->put_node)(man, mem);
777}
778EXPORT_SYMBOL(ttm_bo_mem_put);
779
780/**
781 * Add the last move fence to the BO and reserve a new shared slot.
782 */
783static int ttm_bo_add_move_fence(struct ttm_buffer_object *bo,
784 struct ttm_mem_type_manager *man,
785 struct ttm_mem_reg *mem)
786{
787 struct dma_fence *fence;
788 int ret;
789
790 spin_lock(&man->move_lock);
791 fence = dma_fence_get(man->move);
792 spin_unlock(&man->move_lock);
793
794 if (fence) {
795 reservation_object_add_shared_fence(bo->resv, fence);
796
797 ret = reservation_object_reserve_shared(bo->resv);
798 if (unlikely(ret))
799 return ret;
800
801 dma_fence_put(bo->moving);
802 bo->moving = fence;
803 }
804
805 return 0;
806}
807
808/**
809 * Repeatedly evict memory from the LRU for @mem_type until we create enough
810 * space, or we've evicted everything and there isn't enough space.
811 */
812static int ttm_bo_mem_force_space(struct ttm_buffer_object *bo,
813 uint32_t mem_type,
814 const struct ttm_place *place,
815 struct ttm_mem_reg *mem,
816 struct ttm_operation_ctx *ctx)
817{
818 struct ttm_bo_device *bdev = bo->bdev;
819 struct ttm_mem_type_manager *man = &bdev->man[mem_type];
820 int ret;
821
822 do {
823 ret = (*man->func->get_node)(man, bo, place, mem);
824 if (unlikely(ret != 0))
825 return ret;
826 if (mem->mm_node)
827 break;
828 ret = ttm_mem_evict_first(bdev, mem_type, place, ctx);
829 if (unlikely(ret != 0))
830 return ret;
831 } while (1);
832 mem->mem_type = mem_type;
833 return ttm_bo_add_move_fence(bo, man, mem);
834}
835
836static uint32_t ttm_bo_select_caching(struct ttm_mem_type_manager *man,
837 uint32_t cur_placement,
838 uint32_t proposed_placement)
839{
840 uint32_t caching = proposed_placement & TTM_PL_MASK_CACHING;
841 uint32_t result = proposed_placement & ~TTM_PL_MASK_CACHING;
842
843 /**
844 * Keep current caching if possible.
845 */
846
847 if ((cur_placement & caching) != 0)
848 result |= (cur_placement & caching);
849 else if ((man->default_caching & caching) != 0)
850 result |= man->default_caching;
851 else if ((TTM_PL_FLAG_CACHED & caching) != 0)
852 result |= TTM_PL_FLAG_CACHED;
853 else if ((TTM_PL_FLAG_WC & caching) != 0)
854 result |= TTM_PL_FLAG_WC;
855 else if ((TTM_PL_FLAG_UNCACHED & caching) != 0)
856 result |= TTM_PL_FLAG_UNCACHED;
857
858 return result;
859}
860
861static bool ttm_bo_mt_compatible(struct ttm_mem_type_manager *man,
862 uint32_t mem_type,
863 const struct ttm_place *place,
864 uint32_t *masked_placement)
865{
866 uint32_t cur_flags = ttm_bo_type_flags(mem_type);
867
868 if ((cur_flags & place->flags & TTM_PL_MASK_MEM) == 0)
869 return false;
870
871 if ((place->flags & man->available_caching) == 0)
872 return false;
873
874 cur_flags |= (place->flags & man->available_caching);
875
876 *masked_placement = cur_flags;
877 return true;
878}
879
880/**
881 * Creates space for memory region @mem according to its type.
882 *
883 * This function first searches for free space in compatible memory types in
884 * the priority order defined by the driver. If free space isn't found, then
885 * ttm_bo_mem_force_space is attempted in priority order to evict and find
886 * space.
887 */
888int ttm_bo_mem_space(struct ttm_buffer_object *bo,
889 struct ttm_placement *placement,
890 struct ttm_mem_reg *mem,
891 struct ttm_operation_ctx *ctx)
892{
893 struct ttm_bo_device *bdev = bo->bdev;
894 struct ttm_mem_type_manager *man;
895 uint32_t mem_type = TTM_PL_SYSTEM;
896 uint32_t cur_flags = 0;
897 bool type_found = false;
898 bool type_ok = false;
899 bool has_erestartsys = false;
900 int i, ret;
901
902 ret = reservation_object_reserve_shared(bo->resv);
903 if (unlikely(ret))
904 return ret;
905
906 mem->mm_node = NULL;
907 for (i = 0; i < placement->num_placement; ++i) {
908 const struct ttm_place *place = &placement->placement[i];
909
910 ret = ttm_mem_type_from_place(place, &mem_type);
911 if (ret)
912 return ret;
913 man = &bdev->man[mem_type];
914 if (!man->has_type || !man->use_type)
915 continue;
916
917 type_ok = ttm_bo_mt_compatible(man, mem_type, place,
918 &cur_flags);
919
920 if (!type_ok)
921 continue;
922
923 type_found = true;
924 cur_flags = ttm_bo_select_caching(man, bo->mem.placement,
925 cur_flags);
926 /*
927 * Use the access and other non-mapping-related flag bits from
928 * the memory placement flags to the current flags
929 */
930 ttm_flag_masked(&cur_flags, place->flags,
931 ~TTM_PL_MASK_MEMTYPE);
932
933 if (mem_type == TTM_PL_SYSTEM)
934 break;
935
936 ret = (*man->func->get_node)(man, bo, place, mem);
937 if (unlikely(ret))
938 return ret;
939
940 if (mem->mm_node) {
941 ret = ttm_bo_add_move_fence(bo, man, mem);
942 if (unlikely(ret)) {
943 (*man->func->put_node)(man, mem);
944 return ret;
945 }
946 break;
947 }
948 }
949
950 if ((type_ok && (mem_type == TTM_PL_SYSTEM)) || mem->mm_node) {
951 mem->mem_type = mem_type;
952 mem->placement = cur_flags;
953 return 0;
954 }
955
956 for (i = 0; i < placement->num_busy_placement; ++i) {
957 const struct ttm_place *place = &placement->busy_placement[i];
958
959 ret = ttm_mem_type_from_place(place, &mem_type);
960 if (ret)
961 return ret;
962 man = &bdev->man[mem_type];
963 if (!man->has_type || !man->use_type)
964 continue;
965 if (!ttm_bo_mt_compatible(man, mem_type, place, &cur_flags))
966 continue;
967
968 type_found = true;
969 cur_flags = ttm_bo_select_caching(man, bo->mem.placement,
970 cur_flags);
971 /*
972 * Use the access and other non-mapping-related flag bits from
973 * the memory placement flags to the current flags
974 */
975 ttm_flag_masked(&cur_flags, place->flags,
976 ~TTM_PL_MASK_MEMTYPE);
977
978 if (mem_type == TTM_PL_SYSTEM) {
979 mem->mem_type = mem_type;
980 mem->placement = cur_flags;
981 mem->mm_node = NULL;
982 return 0;
983 }
984
985 ret = ttm_bo_mem_force_space(bo, mem_type, place, mem, ctx);
986 if (ret == 0 && mem->mm_node) {
987 mem->placement = cur_flags;
988 return 0;
989 }
990 if (ret == -ERESTARTSYS)
991 has_erestartsys = true;
992 }
993
994 if (!type_found) {
995 pr_err(TTM_PFX "No compatible memory type found\n");
996 return -EINVAL;
997 }
998
999 return (has_erestartsys) ? -ERESTARTSYS : -ENOMEM;
1000}
1001EXPORT_SYMBOL(ttm_bo_mem_space);
1002
1003static int ttm_bo_move_buffer(struct ttm_buffer_object *bo,
1004 struct ttm_placement *placement,
1005 struct ttm_operation_ctx *ctx)
1006{
1007 int ret = 0;
1008 struct ttm_mem_reg mem;
1009
1010 reservation_object_assert_held(bo->resv);
1011
1012 mem.num_pages = bo->num_pages;
1013 mem.size = mem.num_pages << PAGE_SHIFT;
1014 mem.page_alignment = bo->mem.page_alignment;
1015 mem.bus.io_reserved_vm = false;
1016 mem.bus.io_reserved_count = 0;
1017 /*
1018 * Determine where to move the buffer.
1019 */
1020 ret = ttm_bo_mem_space(bo, placement, &mem, ctx);
1021 if (ret)
1022 goto out_unlock;
1023 ret = ttm_bo_handle_move_mem(bo, &mem, false, ctx);
1024out_unlock:
1025 if (ret && mem.mm_node)
1026 ttm_bo_mem_put(bo, &mem);
1027 return ret;
1028}
1029
1030static bool ttm_bo_places_compat(const struct ttm_place *places,
1031 unsigned num_placement,
1032 struct ttm_mem_reg *mem,
1033 uint32_t *new_flags)
1034{
1035 unsigned i;
1036
1037 for (i = 0; i < num_placement; i++) {
1038 const struct ttm_place *heap = &places[i];
1039
1040 if (mem->mm_node && (mem->start < heap->fpfn ||
1041 (heap->lpfn != 0 && (mem->start + mem->num_pages) > heap->lpfn)))
1042 continue;
1043
1044 *new_flags = heap->flags;
1045 if ((*new_flags & mem->placement & TTM_PL_MASK_CACHING) &&
1046 (*new_flags & mem->placement & TTM_PL_MASK_MEM) &&
1047 (!(*new_flags & TTM_PL_FLAG_CONTIGUOUS) ||
1048 (mem->placement & TTM_PL_FLAG_CONTIGUOUS)))
1049 return true;
1050 }
1051 return false;
1052}
1053
1054bool ttm_bo_mem_compat(struct ttm_placement *placement,
1055 struct ttm_mem_reg *mem,
1056 uint32_t *new_flags)
1057{
1058 if (ttm_bo_places_compat(placement->placement, placement->num_placement,
1059 mem, new_flags))
1060 return true;
1061
1062 if ((placement->busy_placement != placement->placement ||
1063 placement->num_busy_placement > placement->num_placement) &&
1064 ttm_bo_places_compat(placement->busy_placement,
1065 placement->num_busy_placement,
1066 mem, new_flags))
1067 return true;
1068
1069 return false;
1070}
1071EXPORT_SYMBOL(ttm_bo_mem_compat);
1072
1073int ttm_bo_validate(struct ttm_buffer_object *bo,
1074 struct ttm_placement *placement,
1075 struct ttm_operation_ctx *ctx)
1076{
1077 int ret;
1078 uint32_t new_flags;
1079
1080 reservation_object_assert_held(bo->resv);
1081 /*
1082 * Check whether we need to move buffer.
1083 */
1084 if (!ttm_bo_mem_compat(placement, &bo->mem, &new_flags)) {
1085 ret = ttm_bo_move_buffer(bo, placement, ctx);
1086 if (ret)
1087 return ret;
1088 } else {
1089 /*
1090 * Use the access and other non-mapping-related flag bits from
1091 * the compatible memory placement flags to the active flags
1092 */
1093 ttm_flag_masked(&bo->mem.placement, new_flags,
1094 ~TTM_PL_MASK_MEMTYPE);
1095 }
1096 /*
1097 * We might need to add a TTM.
1098 */
1099 if (bo->mem.mem_type == TTM_PL_SYSTEM && bo->ttm == NULL) {
1100 ret = ttm_tt_create(bo, true);
1101 if (ret)
1102 return ret;
1103 }
1104 return 0;
1105}
1106EXPORT_SYMBOL(ttm_bo_validate);
1107
1108int ttm_bo_init_reserved(struct ttm_bo_device *bdev,
1109 struct ttm_buffer_object *bo,
1110 unsigned long size,
1111 enum ttm_bo_type type,
1112 struct ttm_placement *placement,
1113 uint32_t page_alignment,
1114 struct ttm_operation_ctx *ctx,
1115 size_t acc_size,
1116 struct sg_table *sg,
1117 struct reservation_object *resv,
1118 void (*destroy) (struct ttm_buffer_object *))
1119{
1120 int ret = 0;
1121 unsigned long num_pages;
1122 struct ttm_mem_global *mem_glob = bdev->glob->mem_glob;
1123 bool locked;
1124
1125 ret = ttm_mem_global_alloc(mem_glob, acc_size, ctx);
1126 if (ret) {
1127 pr_err("Out of kernel memory\n");
1128 if (destroy)
1129 (*destroy)(bo);
1130 else
1131 kfree(bo);
1132 return -ENOMEM;
1133 }
1134
1135 num_pages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
1136 if (num_pages == 0) {
1137 pr_err("Illegal buffer object size\n");
1138 if (destroy)
1139 (*destroy)(bo);
1140 else
1141 kfree(bo);
1142 ttm_mem_global_free(mem_glob, acc_size);
1143 return -EINVAL;
1144 }
1145 bo->destroy = destroy ? destroy : ttm_bo_default_destroy;
1146
1147 kref_init(&bo->kref);
1148 kref_init(&bo->list_kref);
1149 atomic_set(&bo->cpu_writers, 0);
1150 INIT_LIST_HEAD(&bo->lru);
1151 INIT_LIST_HEAD(&bo->ddestroy);
1152 INIT_LIST_HEAD(&bo->swap);
1153 INIT_LIST_HEAD(&bo->io_reserve_lru);
1154 mutex_init(&bo->wu_mutex);
1155 bo->bdev = bdev;
1156 bo->type = type;
1157 bo->num_pages = num_pages;
1158 bo->mem.size = num_pages << PAGE_SHIFT;
1159 bo->mem.mem_type = TTM_PL_SYSTEM;
1160 bo->mem.num_pages = bo->num_pages;
1161 bo->mem.mm_node = NULL;
1162 bo->mem.page_alignment = page_alignment;
1163 bo->mem.bus.io_reserved_vm = false;
1164 bo->mem.bus.io_reserved_count = 0;
1165 bo->moving = NULL;
1166 bo->mem.placement = (TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED);
1167 bo->acc_size = acc_size;
1168 bo->sg = sg;
1169 if (resv) {
1170 bo->resv = resv;
1171 reservation_object_assert_held(bo->resv);
1172 } else {
1173 bo->resv = &bo->ttm_resv;
1174 }
1175 reservation_object_init(&bo->ttm_resv);
1176 atomic_inc(&bo->bdev->glob->bo_count);
1177 drm_vma_node_reset(&bo->vma_node);
1178 bo->priority = 0;
1179
1180 /*
1181 * For ttm_bo_type_device buffers, allocate
1182 * address space from the device.
1183 */
1184 if (bo->type == ttm_bo_type_device ||
1185 bo->type == ttm_bo_type_sg)
1186 ret = drm_vma_offset_add(&bdev->vma_manager, &bo->vma_node,
1187 bo->mem.num_pages);
1188
1189 /* passed reservation objects should already be locked,
1190 * since otherwise lockdep will be angered in radeon.
1191 */
1192 if (!resv) {
1193 locked = reservation_object_trylock(bo->resv);
1194 WARN_ON(!locked);
1195 }
1196
1197 if (likely(!ret))
1198 ret = ttm_bo_validate(bo, placement, ctx);
1199
1200 if (unlikely(ret)) {
1201 if (!resv)
1202 ttm_bo_unreserve(bo);
1203
1204 ttm_bo_unref(&bo);
1205 return ret;
1206 }
1207
1208 if (resv && !(bo->mem.placement & TTM_PL_FLAG_NO_EVICT)) {
1209 spin_lock(&bdev->glob->lru_lock);
1210 ttm_bo_add_to_lru(bo);
1211 spin_unlock(&bdev->glob->lru_lock);
1212 }
1213
1214 return ret;
1215}
1216EXPORT_SYMBOL(ttm_bo_init_reserved);
1217
1218int ttm_bo_init(struct ttm_bo_device *bdev,
1219 struct ttm_buffer_object *bo,
1220 unsigned long size,
1221 enum ttm_bo_type type,
1222 struct ttm_placement *placement,
1223 uint32_t page_alignment,
1224 bool interruptible,
1225 size_t acc_size,
1226 struct sg_table *sg,
1227 struct reservation_object *resv,
1228 void (*destroy) (struct ttm_buffer_object *))
1229{
1230 struct ttm_operation_ctx ctx = { interruptible, false };
1231 int ret;
1232
1233 ret = ttm_bo_init_reserved(bdev, bo, size, type, placement,
1234 page_alignment, &ctx, acc_size,
1235 sg, resv, destroy);
1236 if (ret)
1237 return ret;
1238
1239 if (!resv)
1240 ttm_bo_unreserve(bo);
1241
1242 return 0;
1243}
1244EXPORT_SYMBOL(ttm_bo_init);
1245
1246size_t ttm_bo_acc_size(struct ttm_bo_device *bdev,
1247 unsigned long bo_size,
1248 unsigned struct_size)
1249{
1250 unsigned npages = (PAGE_ALIGN(bo_size)) >> PAGE_SHIFT;
1251 size_t size = 0;
1252
1253 size += ttm_round_pot(struct_size);
1254 size += ttm_round_pot(npages * sizeof(void *));
1255 size += ttm_round_pot(sizeof(struct ttm_tt));
1256 return size;
1257}
1258EXPORT_SYMBOL(ttm_bo_acc_size);
1259
1260size_t ttm_bo_dma_acc_size(struct ttm_bo_device *bdev,
1261 unsigned long bo_size,
1262 unsigned struct_size)
1263{
1264 unsigned npages = (PAGE_ALIGN(bo_size)) >> PAGE_SHIFT;
1265 size_t size = 0;
1266
1267 size += ttm_round_pot(struct_size);
1268 size += ttm_round_pot(npages * (2*sizeof(void *) + sizeof(dma_addr_t)));
1269 size += ttm_round_pot(sizeof(struct ttm_dma_tt));
1270 return size;
1271}
1272EXPORT_SYMBOL(ttm_bo_dma_acc_size);
1273
1274int ttm_bo_create(struct ttm_bo_device *bdev,
1275 unsigned long size,
1276 enum ttm_bo_type type,
1277 struct ttm_placement *placement,
1278 uint32_t page_alignment,
1279 bool interruptible,
1280 struct ttm_buffer_object **p_bo)
1281{
1282 struct ttm_buffer_object *bo;
1283 size_t acc_size;
1284 int ret;
1285
1286 bo = kzalloc(sizeof(*bo), GFP_KERNEL);
1287 if (unlikely(bo == NULL))
1288 return -ENOMEM;
1289
1290 acc_size = ttm_bo_acc_size(bdev, size, sizeof(struct ttm_buffer_object));
1291 ret = ttm_bo_init(bdev, bo, size, type, placement, page_alignment,
1292 interruptible, acc_size,
1293 NULL, NULL, NULL);
1294 if (likely(ret == 0))
1295 *p_bo = bo;
1296
1297 return ret;
1298}
1299EXPORT_SYMBOL(ttm_bo_create);
1300
1301static int ttm_bo_force_list_clean(struct ttm_bo_device *bdev,
1302 unsigned mem_type)
1303{
1304 struct ttm_operation_ctx ctx = {
1305 .interruptible = false,
1306 .no_wait_gpu = false,
1307 .flags = TTM_OPT_FLAG_FORCE_ALLOC
1308 };
1309 struct ttm_mem_type_manager *man = &bdev->man[mem_type];
1310 struct ttm_bo_global *glob = bdev->glob;
1311 struct dma_fence *fence;
1312 int ret;
1313 unsigned i;
1314
1315 /*
1316 * Can't use standard list traversal since we're unlocking.
1317 */
1318
1319 spin_lock(&glob->lru_lock);
1320 for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i) {
1321 while (!list_empty(&man->lru[i])) {
1322 spin_unlock(&glob->lru_lock);
1323 ret = ttm_mem_evict_first(bdev, mem_type, NULL, &ctx);
1324 if (ret)
1325 return ret;
1326 spin_lock(&glob->lru_lock);
1327 }
1328 }
1329 spin_unlock(&glob->lru_lock);
1330
1331 spin_lock(&man->move_lock);
1332 fence = dma_fence_get(man->move);
1333 spin_unlock(&man->move_lock);
1334
1335 if (fence) {
1336 ret = dma_fence_wait(fence, false);
1337 dma_fence_put(fence);
1338 if (ret)
1339 return ret;
1340 }
1341
1342 return 0;
1343}
1344
1345int ttm_bo_clean_mm(struct ttm_bo_device *bdev, unsigned mem_type)
1346{
1347 struct ttm_mem_type_manager *man;
1348 int ret = -EINVAL;
1349
1350 if (mem_type >= TTM_NUM_MEM_TYPES) {
1351 pr_err("Illegal memory type %d\n", mem_type);
1352 return ret;
1353 }
1354 man = &bdev->man[mem_type];
1355
1356 if (!man->has_type) {
1357 pr_err("Trying to take down uninitialized memory manager type %u\n",
1358 mem_type);
1359 return ret;
1360 }
1361
1362 man->use_type = false;
1363 man->has_type = false;
1364
1365 ret = 0;
1366 if (mem_type > 0) {
1367 ret = ttm_bo_force_list_clean(bdev, mem_type);
1368 if (ret) {
1369 pr_err("Cleanup eviction failed\n");
1370 return ret;
1371 }
1372
1373 ret = (*man->func->takedown)(man);
1374 }
1375
1376 dma_fence_put(man->move);
1377 man->move = NULL;
1378
1379 return ret;
1380}
1381EXPORT_SYMBOL(ttm_bo_clean_mm);
1382
1383int ttm_bo_evict_mm(struct ttm_bo_device *bdev, unsigned mem_type)
1384{
1385 struct ttm_mem_type_manager *man = &bdev->man[mem_type];
1386
1387 if (mem_type == 0 || mem_type >= TTM_NUM_MEM_TYPES) {
1388 pr_err("Illegal memory manager memory type %u\n", mem_type);
1389 return -EINVAL;
1390 }
1391
1392 if (!man->has_type) {
1393 pr_err("Memory type %u has not been initialized\n", mem_type);
1394 return 0;
1395 }
1396
1397 return ttm_bo_force_list_clean(bdev, mem_type);
1398}
1399EXPORT_SYMBOL(ttm_bo_evict_mm);
1400
1401int ttm_bo_init_mm(struct ttm_bo_device *bdev, unsigned type,
1402 unsigned long p_size)
1403{
1404 int ret;
1405 struct ttm_mem_type_manager *man;
1406 unsigned i;
1407
1408 BUG_ON(type >= TTM_NUM_MEM_TYPES);
1409 man = &bdev->man[type];
1410 BUG_ON(man->has_type);
1411 man->io_reserve_fastpath = true;
1412 man->use_io_reserve_lru = false;
1413 mutex_init(&man->io_reserve_mutex);
1414 spin_lock_init(&man->move_lock);
1415 INIT_LIST_HEAD(&man->io_reserve_lru);
1416
1417 ret = bdev->driver->init_mem_type(bdev, type, man);
1418 if (ret)
1419 return ret;
1420 man->bdev = bdev;
1421
1422 if (type != TTM_PL_SYSTEM) {
1423 ret = (*man->func->init)(man, p_size);
1424 if (ret)
1425 return ret;
1426 }
1427 man->has_type = true;
1428 man->use_type = true;
1429 man->size = p_size;
1430
1431 for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i)
1432 INIT_LIST_HEAD(&man->lru[i]);
1433 man->move = NULL;
1434
1435 return 0;
1436}
1437EXPORT_SYMBOL(ttm_bo_init_mm);
1438
1439static void ttm_bo_global_kobj_release(struct kobject *kobj)
1440{
1441 struct ttm_bo_global *glob =
1442 container_of(kobj, struct ttm_bo_global, kobj);
1443
1444 __free_page(glob->dummy_read_page);
1445 kfree(glob);
1446}
1447
1448void ttm_bo_global_release(struct drm_global_reference *ref)
1449{
1450 struct ttm_bo_global *glob = ref->object;
1451
1452 kobject_del(&glob->kobj);
1453 kobject_put(&glob->kobj);
1454}
1455EXPORT_SYMBOL(ttm_bo_global_release);
1456
1457int ttm_bo_global_init(struct drm_global_reference *ref)
1458{
1459 struct ttm_bo_global_ref *bo_ref =
1460 container_of(ref, struct ttm_bo_global_ref, ref);
1461 struct ttm_bo_global *glob = ref->object;
1462 int ret;
1463 unsigned i;
1464
1465 mutex_init(&glob->device_list_mutex);
1466 spin_lock_init(&glob->lru_lock);
1467 glob->mem_glob = bo_ref->mem_glob;
1468 glob->mem_glob->bo_glob = glob;
1469 glob->dummy_read_page = alloc_page(__GFP_ZERO | GFP_DMA32);
1470
1471 if (unlikely(glob->dummy_read_page == NULL)) {
1472 ret = -ENOMEM;
1473 goto out_no_drp;
1474 }
1475
1476 for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i)
1477 INIT_LIST_HEAD(&glob->swap_lru[i]);
1478 INIT_LIST_HEAD(&glob->device_list);
1479 atomic_set(&glob->bo_count, 0);
1480
1481 ret = kobject_init_and_add(
1482 &glob->kobj, &ttm_bo_glob_kobj_type, ttm_get_kobj(), "buffer_objects");
1483 if (unlikely(ret != 0))
1484 kobject_put(&glob->kobj);
1485 return ret;
1486out_no_drp:
1487 kfree(glob);
1488 return ret;
1489}
1490EXPORT_SYMBOL(ttm_bo_global_init);
1491
1492
1493int ttm_bo_device_release(struct ttm_bo_device *bdev)
1494{
1495 int ret = 0;
1496 unsigned i = TTM_NUM_MEM_TYPES;
1497 struct ttm_mem_type_manager *man;
1498 struct ttm_bo_global *glob = bdev->glob;
1499
1500 while (i--) {
1501 man = &bdev->man[i];
1502 if (man->has_type) {
1503 man->use_type = false;
1504 if ((i != TTM_PL_SYSTEM) && ttm_bo_clean_mm(bdev, i)) {
1505 ret = -EBUSY;
1506 pr_err("DRM memory manager type %d is not clean\n",
1507 i);
1508 }
1509 man->has_type = false;
1510 }
1511 }
1512
1513 mutex_lock(&glob->device_list_mutex);
1514 list_del(&bdev->device_list);
1515 mutex_unlock(&glob->device_list_mutex);
1516
1517 cancel_delayed_work_sync(&bdev->wq);
1518
1519 if (ttm_bo_delayed_delete(bdev, true))
1520 pr_debug("Delayed destroy list was clean\n");
1521
1522 spin_lock(&glob->lru_lock);
1523 for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i)
1524 if (list_empty(&bdev->man[0].lru[0]))
1525 pr_debug("Swap list %d was clean\n", i);
1526 spin_unlock(&glob->lru_lock);
1527
1528 drm_vma_offset_manager_destroy(&bdev->vma_manager);
1529
1530 return ret;
1531}
1532EXPORT_SYMBOL(ttm_bo_device_release);
1533
1534int ttm_bo_device_init(struct ttm_bo_device *bdev,
1535 struct ttm_bo_global *glob,
1536 struct ttm_bo_driver *driver,
1537 struct address_space *mapping,
1538 uint64_t file_page_offset,
1539 bool need_dma32)
1540{
1541 int ret = -EINVAL;
1542
1543 bdev->driver = driver;
1544
1545 memset(bdev->man, 0, sizeof(bdev->man));
1546
1547 /*
1548 * Initialize the system memory buffer type.
1549 * Other types need to be driver / IOCTL initialized.
1550 */
1551 ret = ttm_bo_init_mm(bdev, TTM_PL_SYSTEM, 0);
1552 if (unlikely(ret != 0))
1553 goto out_no_sys;
1554
1555 drm_vma_offset_manager_init(&bdev->vma_manager, file_page_offset,
1556 0x10000000);
1557 INIT_DELAYED_WORK(&bdev->wq, ttm_bo_delayed_workqueue);
1558 INIT_LIST_HEAD(&bdev->ddestroy);
1559 bdev->dev_mapping = mapping;
1560 bdev->glob = glob;
1561 bdev->need_dma32 = need_dma32;
1562 mutex_lock(&glob->device_list_mutex);
1563 list_add_tail(&bdev->device_list, &glob->device_list);
1564 mutex_unlock(&glob->device_list_mutex);
1565
1566 return 0;
1567out_no_sys:
1568 return ret;
1569}
1570EXPORT_SYMBOL(ttm_bo_device_init);
1571
1572/*
1573 * buffer object vm functions.
1574 */
1575
1576bool ttm_mem_reg_is_pci(struct ttm_bo_device *bdev, struct ttm_mem_reg *mem)
1577{
1578 struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
1579
1580 if (!(man->flags & TTM_MEMTYPE_FLAG_FIXED)) {
1581 if (mem->mem_type == TTM_PL_SYSTEM)
1582 return false;
1583
1584 if (man->flags & TTM_MEMTYPE_FLAG_CMA)
1585 return false;
1586
1587 if (mem->placement & TTM_PL_FLAG_CACHED)
1588 return false;
1589 }
1590 return true;
1591}
1592
1593void ttm_bo_unmap_virtual_locked(struct ttm_buffer_object *bo)
1594{
1595 struct ttm_bo_device *bdev = bo->bdev;
1596
1597 drm_vma_node_unmap(&bo->vma_node, bdev->dev_mapping);
1598 ttm_mem_io_free_vm(bo);
1599}
1600
1601void ttm_bo_unmap_virtual(struct ttm_buffer_object *bo)
1602{
1603 struct ttm_bo_device *bdev = bo->bdev;
1604 struct ttm_mem_type_manager *man = &bdev->man[bo->mem.mem_type];
1605
1606 ttm_mem_io_lock(man, false);
1607 ttm_bo_unmap_virtual_locked(bo);
1608 ttm_mem_io_unlock(man);
1609}
1610
1611
1612EXPORT_SYMBOL(ttm_bo_unmap_virtual);
1613
1614int ttm_bo_wait(struct ttm_buffer_object *bo,
1615 bool interruptible, bool no_wait)
1616{
1617 long timeout = 15 * HZ;
1618
1619 if (no_wait) {
1620 if (reservation_object_test_signaled_rcu(bo->resv, true))
1621 return 0;
1622 else
1623 return -EBUSY;
1624 }
1625
1626 timeout = reservation_object_wait_timeout_rcu(bo->resv, true,
1627 interruptible, timeout);
1628 if (timeout < 0)
1629 return timeout;
1630
1631 if (timeout == 0)
1632 return -EBUSY;
1633
1634 reservation_object_add_excl_fence(bo->resv, NULL);
1635 return 0;
1636}
1637EXPORT_SYMBOL(ttm_bo_wait);
1638
1639int ttm_bo_synccpu_write_grab(struct ttm_buffer_object *bo, bool no_wait)
1640{
1641 int ret = 0;
1642
1643 /*
1644 * Using ttm_bo_reserve makes sure the lru lists are updated.
1645 */
1646
1647 ret = ttm_bo_reserve(bo, true, no_wait, NULL);
1648 if (unlikely(ret != 0))
1649 return ret;
1650 ret = ttm_bo_wait(bo, true, no_wait);
1651 if (likely(ret == 0))
1652 atomic_inc(&bo->cpu_writers);
1653 ttm_bo_unreserve(bo);
1654 return ret;
1655}
1656EXPORT_SYMBOL(ttm_bo_synccpu_write_grab);
1657
1658void ttm_bo_synccpu_write_release(struct ttm_buffer_object *bo)
1659{
1660 atomic_dec(&bo->cpu_writers);
1661}
1662EXPORT_SYMBOL(ttm_bo_synccpu_write_release);
1663
1664/**
1665 * A buffer object shrink method that tries to swap out the first
1666 * buffer object on the bo_global::swap_lru list.
1667 */
1668int ttm_bo_swapout(struct ttm_bo_global *glob, struct ttm_operation_ctx *ctx)
1669{
1670 struct ttm_buffer_object *bo;
1671 int ret = -EBUSY;
1672 bool locked;
1673 unsigned i;
1674
1675 spin_lock(&glob->lru_lock);
1676 for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i) {
1677 list_for_each_entry(bo, &glob->swap_lru[i], swap) {
1678 if (ttm_bo_evict_swapout_allowable(bo, ctx, &locked)) {
1679 ret = 0;
1680 break;
1681 }
1682 }
1683 if (!ret)
1684 break;
1685 }
1686
1687 if (ret) {
1688 spin_unlock(&glob->lru_lock);
1689 return ret;
1690 }
1691
1692 kref_get(&bo->list_kref);
1693
1694 if (!list_empty(&bo->ddestroy)) {
1695 ret = ttm_bo_cleanup_refs(bo, false, false, locked);
1696 kref_put(&bo->list_kref, ttm_bo_release_list);
1697 return ret;
1698 }
1699
1700 ttm_bo_del_from_lru(bo);
1701 spin_unlock(&glob->lru_lock);
1702
1703 /**
1704 * Move to system cached
1705 */
1706
1707 if (bo->mem.mem_type != TTM_PL_SYSTEM ||
1708 bo->ttm->caching_state != tt_cached) {
1709 struct ttm_operation_ctx ctx = { false, false };
1710 struct ttm_mem_reg evict_mem;
1711
1712 evict_mem = bo->mem;
1713 evict_mem.mm_node = NULL;
1714 evict_mem.placement = TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED;
1715 evict_mem.mem_type = TTM_PL_SYSTEM;
1716
1717 ret = ttm_bo_handle_move_mem(bo, &evict_mem, true, &ctx);
1718 if (unlikely(ret != 0))
1719 goto out;
1720 }
1721
1722 /**
1723 * Make sure BO is idle.
1724 */
1725
1726 ret = ttm_bo_wait(bo, false, false);
1727 if (unlikely(ret != 0))
1728 goto out;
1729
1730 ttm_bo_unmap_virtual(bo);
1731
1732 /**
1733 * Swap out. Buffer will be swapped in again as soon as
1734 * anyone tries to access a ttm page.
1735 */
1736
1737 if (bo->bdev->driver->swap_notify)
1738 bo->bdev->driver->swap_notify(bo);
1739
1740 ret = ttm_tt_swapout(bo->ttm, bo->persistent_swap_storage);
1741out:
1742
1743 /**
1744 *
1745 * Unreserve without putting on LRU to avoid swapping out an
1746 * already swapped buffer.
1747 */
1748 if (locked)
1749 reservation_object_unlock(bo->resv);
1750 kref_put(&bo->list_kref, ttm_bo_release_list);
1751 return ret;
1752}
1753EXPORT_SYMBOL(ttm_bo_swapout);
1754
1755void ttm_bo_swapout_all(struct ttm_bo_device *bdev)
1756{
1757 struct ttm_operation_ctx ctx = {
1758 .interruptible = false,
1759 .no_wait_gpu = false
1760 };
1761
1762 while (ttm_bo_swapout(bdev->glob, &ctx) == 0)
1763 ;
1764}
1765EXPORT_SYMBOL(ttm_bo_swapout_all);
1766
1767/**
1768 * ttm_bo_wait_unreserved - interruptible wait for a buffer object to become
1769 * unreserved
1770 *
1771 * @bo: Pointer to buffer
1772 */
1773int ttm_bo_wait_unreserved(struct ttm_buffer_object *bo)
1774{
1775 int ret;
1776
1777 /*
1778 * In the absense of a wait_unlocked API,
1779 * Use the bo::wu_mutex to avoid triggering livelocks due to
1780 * concurrent use of this function. Note that this use of
1781 * bo::wu_mutex can go away if we change locking order to
1782 * mmap_sem -> bo::reserve.
1783 */
1784 ret = mutex_lock_interruptible(&bo->wu_mutex);
1785 if (unlikely(ret != 0))
1786 return -ERESTARTSYS;
1787 if (!ww_mutex_is_locked(&bo->resv->lock))
1788 goto out_unlock;
1789 ret = reservation_object_lock_interruptible(bo->resv, NULL);
1790 if (ret == -EINTR)
1791 ret = -ERESTARTSYS;
1792 if (unlikely(ret != 0))
1793 goto out_unlock;
1794 reservation_object_unlock(bo->resv);
1795
1796out_unlock:
1797 mutex_unlock(&bo->wu_mutex);
1798 return ret;
1799}