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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
44#define TTM_ASSERT_LOCKED(param)
45#define TTM_DEBUG(fmt, arg...)
46#define TTM_BO_HASH_ORDER 13
47
48static int ttm_bo_swapout(struct ttm_mem_shrink *shrink);
49static void ttm_bo_global_kobj_release(struct kobject *kobj);
50
51static struct attribute ttm_bo_count = {
52 .name = "bo_count",
53 .mode = S_IRUGO
54};
55
56static inline int ttm_mem_type_from_flags(uint32_t flags, uint32_t *mem_type)
57{
58 int i;
59
60 for (i = 0; i <= TTM_PL_PRIV5; i++)
61 if (flags & (1 << i)) {
62 *mem_type = i;
63 return 0;
64 }
65 return -EINVAL;
66}
67
68static void ttm_mem_type_debug(struct ttm_bo_device *bdev, int mem_type)
69{
70 struct ttm_mem_type_manager *man = &bdev->man[mem_type];
71
72 pr_err(" has_type: %d\n", man->has_type);
73 pr_err(" use_type: %d\n", man->use_type);
74 pr_err(" flags: 0x%08X\n", man->flags);
75 pr_err(" gpu_offset: 0x%08lX\n", man->gpu_offset);
76 pr_err(" size: %llu\n", man->size);
77 pr_err(" available_caching: 0x%08X\n", man->available_caching);
78 pr_err(" default_caching: 0x%08X\n", man->default_caching);
79 if (mem_type != TTM_PL_SYSTEM)
80 (*man->func->debug)(man, TTM_PFX);
81}
82
83static void ttm_bo_mem_space_debug(struct ttm_buffer_object *bo,
84 struct ttm_placement *placement)
85{
86 int i, ret, mem_type;
87
88 pr_err("No space for %p (%lu pages, %luK, %luM)\n",
89 bo, bo->mem.num_pages, bo->mem.size >> 10,
90 bo->mem.size >> 20);
91 for (i = 0; i < placement->num_placement; i++) {
92 ret = ttm_mem_type_from_flags(placement->placement[i],
93 &mem_type);
94 if (ret)
95 return;
96 pr_err(" placement[%d]=0x%08X (%d)\n",
97 i, placement->placement[i], mem_type);
98 ttm_mem_type_debug(bo->bdev, mem_type);
99 }
100}
101
102static ssize_t ttm_bo_global_show(struct kobject *kobj,
103 struct attribute *attr,
104 char *buffer)
105{
106 struct ttm_bo_global *glob =
107 container_of(kobj, struct ttm_bo_global, kobj);
108
109 return snprintf(buffer, PAGE_SIZE, "%lu\n",
110 (unsigned long) atomic_read(&glob->bo_count));
111}
112
113static struct attribute *ttm_bo_global_attrs[] = {
114 &ttm_bo_count,
115 NULL
116};
117
118static const struct sysfs_ops ttm_bo_global_ops = {
119 .show = &ttm_bo_global_show
120};
121
122static struct kobj_type ttm_bo_glob_kobj_type = {
123 .release = &ttm_bo_global_kobj_release,
124 .sysfs_ops = &ttm_bo_global_ops,
125 .default_attrs = ttm_bo_global_attrs
126};
127
128
129static inline uint32_t ttm_bo_type_flags(unsigned type)
130{
131 return 1 << (type);
132}
133
134static void ttm_bo_release_list(struct kref *list_kref)
135{
136 struct ttm_buffer_object *bo =
137 container_of(list_kref, struct ttm_buffer_object, list_kref);
138 struct ttm_bo_device *bdev = bo->bdev;
139 size_t acc_size = bo->acc_size;
140
141 BUG_ON(atomic_read(&bo->list_kref.refcount));
142 BUG_ON(atomic_read(&bo->kref.refcount));
143 BUG_ON(atomic_read(&bo->cpu_writers));
144 BUG_ON(bo->sync_obj != NULL);
145 BUG_ON(bo->mem.mm_node != NULL);
146 BUG_ON(!list_empty(&bo->lru));
147 BUG_ON(!list_empty(&bo->ddestroy));
148
149 if (bo->ttm)
150 ttm_tt_destroy(bo->ttm);
151 atomic_dec(&bo->glob->bo_count);
152 if (bo->resv == &bo->ttm_resv)
153 reservation_object_fini(&bo->ttm_resv);
154 mutex_destroy(&bo->wu_mutex);
155 if (bo->destroy)
156 bo->destroy(bo);
157 else {
158 kfree(bo);
159 }
160 ttm_mem_global_free(bdev->glob->mem_glob, acc_size);
161}
162
163void ttm_bo_add_to_lru(struct ttm_buffer_object *bo)
164{
165 struct ttm_bo_device *bdev = bo->bdev;
166 struct ttm_mem_type_manager *man;
167
168 lockdep_assert_held(&bo->resv->lock.base);
169
170 if (!(bo->mem.placement & TTM_PL_FLAG_NO_EVICT)) {
171
172 BUG_ON(!list_empty(&bo->lru));
173
174 man = &bdev->man[bo->mem.mem_type];
175 list_add_tail(&bo->lru, &man->lru);
176 kref_get(&bo->list_kref);
177
178 if (bo->ttm != NULL) {
179 list_add_tail(&bo->swap, &bo->glob->swap_lru);
180 kref_get(&bo->list_kref);
181 }
182 }
183}
184EXPORT_SYMBOL(ttm_bo_add_to_lru);
185
186int ttm_bo_del_from_lru(struct ttm_buffer_object *bo)
187{
188 int put_count = 0;
189
190 if (!list_empty(&bo->swap)) {
191 list_del_init(&bo->swap);
192 ++put_count;
193 }
194 if (!list_empty(&bo->lru)) {
195 list_del_init(&bo->lru);
196 ++put_count;
197 }
198
199 /*
200 * TODO: Add a driver hook to delete from
201 * driver-specific LRU's here.
202 */
203
204 return put_count;
205}
206
207static void ttm_bo_ref_bug(struct kref *list_kref)
208{
209 BUG();
210}
211
212void ttm_bo_list_ref_sub(struct ttm_buffer_object *bo, int count,
213 bool never_free)
214{
215 kref_sub(&bo->list_kref, count,
216 (never_free) ? ttm_bo_ref_bug : ttm_bo_release_list);
217}
218
219void ttm_bo_del_sub_from_lru(struct ttm_buffer_object *bo)
220{
221 int put_count;
222
223 spin_lock(&bo->glob->lru_lock);
224 put_count = ttm_bo_del_from_lru(bo);
225 spin_unlock(&bo->glob->lru_lock);
226 ttm_bo_list_ref_sub(bo, put_count, true);
227}
228EXPORT_SYMBOL(ttm_bo_del_sub_from_lru);
229
230/*
231 * Call bo->mutex locked.
232 */
233static int ttm_bo_add_ttm(struct ttm_buffer_object *bo, bool zero_alloc)
234{
235 struct ttm_bo_device *bdev = bo->bdev;
236 struct ttm_bo_global *glob = bo->glob;
237 int ret = 0;
238 uint32_t page_flags = 0;
239
240 TTM_ASSERT_LOCKED(&bo->mutex);
241 bo->ttm = NULL;
242
243 if (bdev->need_dma32)
244 page_flags |= TTM_PAGE_FLAG_DMA32;
245
246 switch (bo->type) {
247 case ttm_bo_type_device:
248 if (zero_alloc)
249 page_flags |= TTM_PAGE_FLAG_ZERO_ALLOC;
250 case ttm_bo_type_kernel:
251 bo->ttm = bdev->driver->ttm_tt_create(bdev, bo->num_pages << PAGE_SHIFT,
252 page_flags, glob->dummy_read_page);
253 if (unlikely(bo->ttm == NULL))
254 ret = -ENOMEM;
255 break;
256 case ttm_bo_type_sg:
257 bo->ttm = bdev->driver->ttm_tt_create(bdev, bo->num_pages << PAGE_SHIFT,
258 page_flags | TTM_PAGE_FLAG_SG,
259 glob->dummy_read_page);
260 if (unlikely(bo->ttm == NULL)) {
261 ret = -ENOMEM;
262 break;
263 }
264 bo->ttm->sg = bo->sg;
265 break;
266 default:
267 pr_err("Illegal buffer object type\n");
268 ret = -EINVAL;
269 break;
270 }
271
272 return ret;
273}
274
275static int ttm_bo_handle_move_mem(struct ttm_buffer_object *bo,
276 struct ttm_mem_reg *mem,
277 bool evict, bool interruptible,
278 bool no_wait_gpu)
279{
280 struct ttm_bo_device *bdev = bo->bdev;
281 bool old_is_pci = ttm_mem_reg_is_pci(bdev, &bo->mem);
282 bool new_is_pci = ttm_mem_reg_is_pci(bdev, mem);
283 struct ttm_mem_type_manager *old_man = &bdev->man[bo->mem.mem_type];
284 struct ttm_mem_type_manager *new_man = &bdev->man[mem->mem_type];
285 int ret = 0;
286
287 if (old_is_pci || new_is_pci ||
288 ((mem->placement & bo->mem.placement & TTM_PL_MASK_CACHING) == 0)) {
289 ret = ttm_mem_io_lock(old_man, true);
290 if (unlikely(ret != 0))
291 goto out_err;
292 ttm_bo_unmap_virtual_locked(bo);
293 ttm_mem_io_unlock(old_man);
294 }
295
296 /*
297 * Create and bind a ttm if required.
298 */
299
300 if (!(new_man->flags & TTM_MEMTYPE_FLAG_FIXED)) {
301 if (bo->ttm == NULL) {
302 bool zero = !(old_man->flags & TTM_MEMTYPE_FLAG_FIXED);
303 ret = ttm_bo_add_ttm(bo, zero);
304 if (ret)
305 goto out_err;
306 }
307
308 ret = ttm_tt_set_placement_caching(bo->ttm, mem->placement);
309 if (ret)
310 goto out_err;
311
312 if (mem->mem_type != TTM_PL_SYSTEM) {
313 ret = ttm_tt_bind(bo->ttm, mem);
314 if (ret)
315 goto out_err;
316 }
317
318 if (bo->mem.mem_type == TTM_PL_SYSTEM) {
319 if (bdev->driver->move_notify)
320 bdev->driver->move_notify(bo, mem);
321 bo->mem = *mem;
322 mem->mm_node = NULL;
323 goto moved;
324 }
325 }
326
327 if (bdev->driver->move_notify)
328 bdev->driver->move_notify(bo, mem);
329
330 if (!(old_man->flags & TTM_MEMTYPE_FLAG_FIXED) &&
331 !(new_man->flags & TTM_MEMTYPE_FLAG_FIXED))
332 ret = ttm_bo_move_ttm(bo, evict, no_wait_gpu, mem);
333 else if (bdev->driver->move)
334 ret = bdev->driver->move(bo, evict, interruptible,
335 no_wait_gpu, mem);
336 else
337 ret = ttm_bo_move_memcpy(bo, evict, no_wait_gpu, mem);
338
339 if (ret) {
340 if (bdev->driver->move_notify) {
341 struct ttm_mem_reg tmp_mem = *mem;
342 *mem = bo->mem;
343 bo->mem = tmp_mem;
344 bdev->driver->move_notify(bo, mem);
345 bo->mem = *mem;
346 *mem = tmp_mem;
347 }
348
349 goto out_err;
350 }
351
352moved:
353 if (bo->evicted) {
354 if (bdev->driver->invalidate_caches) {
355 ret = bdev->driver->invalidate_caches(bdev, bo->mem.placement);
356 if (ret)
357 pr_err("Can not flush read caches\n");
358 }
359 bo->evicted = false;
360 }
361
362 if (bo->mem.mm_node) {
363 bo->offset = (bo->mem.start << PAGE_SHIFT) +
364 bdev->man[bo->mem.mem_type].gpu_offset;
365 bo->cur_placement = bo->mem.placement;
366 } else
367 bo->offset = 0;
368
369 return 0;
370
371out_err:
372 new_man = &bdev->man[bo->mem.mem_type];
373 if ((new_man->flags & TTM_MEMTYPE_FLAG_FIXED) && bo->ttm) {
374 ttm_tt_unbind(bo->ttm);
375 ttm_tt_destroy(bo->ttm);
376 bo->ttm = NULL;
377 }
378
379 return ret;
380}
381
382/**
383 * Call bo::reserved.
384 * Will release GPU memory type usage on destruction.
385 * This is the place to put in driver specific hooks to release
386 * driver private resources.
387 * Will release the bo::reserved lock.
388 */
389
390static void ttm_bo_cleanup_memtype_use(struct ttm_buffer_object *bo)
391{
392 if (bo->bdev->driver->move_notify)
393 bo->bdev->driver->move_notify(bo, NULL);
394
395 if (bo->ttm) {
396 ttm_tt_unbind(bo->ttm);
397 ttm_tt_destroy(bo->ttm);
398 bo->ttm = NULL;
399 }
400 ttm_bo_mem_put(bo, &bo->mem);
401
402 ww_mutex_unlock (&bo->resv->lock);
403}
404
405static void ttm_bo_cleanup_refs_or_queue(struct ttm_buffer_object *bo)
406{
407 struct ttm_bo_device *bdev = bo->bdev;
408 struct ttm_bo_global *glob = bo->glob;
409 struct ttm_bo_driver *driver = bdev->driver;
410 void *sync_obj = NULL;
411 int put_count;
412 int ret;
413
414 spin_lock(&glob->lru_lock);
415 ret = __ttm_bo_reserve(bo, false, true, false, 0);
416
417 spin_lock(&bdev->fence_lock);
418 (void) ttm_bo_wait(bo, false, false, true);
419 if (!ret && !bo->sync_obj) {
420 spin_unlock(&bdev->fence_lock);
421 put_count = ttm_bo_del_from_lru(bo);
422
423 spin_unlock(&glob->lru_lock);
424 ttm_bo_cleanup_memtype_use(bo);
425
426 ttm_bo_list_ref_sub(bo, put_count, true);
427
428 return;
429 }
430 if (bo->sync_obj)
431 sync_obj = driver->sync_obj_ref(bo->sync_obj);
432 spin_unlock(&bdev->fence_lock);
433
434 if (!ret) {
435
436 /*
437 * Make NO_EVICT bos immediately available to
438 * shrinkers, now that they are queued for
439 * destruction.
440 */
441 if (bo->mem.placement & TTM_PL_FLAG_NO_EVICT) {
442 bo->mem.placement &= ~TTM_PL_FLAG_NO_EVICT;
443 ttm_bo_add_to_lru(bo);
444 }
445
446 __ttm_bo_unreserve(bo);
447 }
448
449 kref_get(&bo->list_kref);
450 list_add_tail(&bo->ddestroy, &bdev->ddestroy);
451 spin_unlock(&glob->lru_lock);
452
453 if (sync_obj) {
454 driver->sync_obj_flush(sync_obj);
455 driver->sync_obj_unref(&sync_obj);
456 }
457 schedule_delayed_work(&bdev->wq,
458 ((HZ / 100) < 1) ? 1 : HZ / 100);
459}
460
461/**
462 * function ttm_bo_cleanup_refs_and_unlock
463 * If bo idle, remove from delayed- and lru lists, and unref.
464 * If not idle, do nothing.
465 *
466 * Must be called with lru_lock and reservation held, this function
467 * will drop both before returning.
468 *
469 * @interruptible Any sleeps should occur interruptibly.
470 * @no_wait_gpu Never wait for gpu. Return -EBUSY instead.
471 */
472
473static int ttm_bo_cleanup_refs_and_unlock(struct ttm_buffer_object *bo,
474 bool interruptible,
475 bool no_wait_gpu)
476{
477 struct ttm_bo_device *bdev = bo->bdev;
478 struct ttm_bo_driver *driver = bdev->driver;
479 struct ttm_bo_global *glob = bo->glob;
480 int put_count;
481 int ret;
482
483 spin_lock(&bdev->fence_lock);
484 ret = ttm_bo_wait(bo, false, false, true);
485
486 if (ret && !no_wait_gpu) {
487 void *sync_obj;
488
489 /*
490 * Take a reference to the fence and unreserve,
491 * at this point the buffer should be dead, so
492 * no new sync objects can be attached.
493 */
494 sync_obj = driver->sync_obj_ref(bo->sync_obj);
495 spin_unlock(&bdev->fence_lock);
496
497 __ttm_bo_unreserve(bo);
498 spin_unlock(&glob->lru_lock);
499
500 ret = driver->sync_obj_wait(sync_obj, false, interruptible);
501 driver->sync_obj_unref(&sync_obj);
502 if (ret)
503 return ret;
504
505 /*
506 * remove sync_obj with ttm_bo_wait, the wait should be
507 * finished, and no new wait object should have been added.
508 */
509 spin_lock(&bdev->fence_lock);
510 ret = ttm_bo_wait(bo, false, false, true);
511 WARN_ON(ret);
512 spin_unlock(&bdev->fence_lock);
513 if (ret)
514 return ret;
515
516 spin_lock(&glob->lru_lock);
517 ret = __ttm_bo_reserve(bo, false, true, false, 0);
518
519 /*
520 * We raced, and lost, someone else holds the reservation now,
521 * and is probably busy in ttm_bo_cleanup_memtype_use.
522 *
523 * Even if it's not the case, because we finished waiting any
524 * delayed destruction would succeed, so just return success
525 * here.
526 */
527 if (ret) {
528 spin_unlock(&glob->lru_lock);
529 return 0;
530 }
531 } else
532 spin_unlock(&bdev->fence_lock);
533
534 if (ret || unlikely(list_empty(&bo->ddestroy))) {
535 __ttm_bo_unreserve(bo);
536 spin_unlock(&glob->lru_lock);
537 return ret;
538 }
539
540 put_count = ttm_bo_del_from_lru(bo);
541 list_del_init(&bo->ddestroy);
542 ++put_count;
543
544 spin_unlock(&glob->lru_lock);
545 ttm_bo_cleanup_memtype_use(bo);
546
547 ttm_bo_list_ref_sub(bo, put_count, true);
548
549 return 0;
550}
551
552/**
553 * Traverse the delayed list, and call ttm_bo_cleanup_refs on all
554 * encountered buffers.
555 */
556
557static int ttm_bo_delayed_delete(struct ttm_bo_device *bdev, bool remove_all)
558{
559 struct ttm_bo_global *glob = bdev->glob;
560 struct ttm_buffer_object *entry = NULL;
561 int ret = 0;
562
563 spin_lock(&glob->lru_lock);
564 if (list_empty(&bdev->ddestroy))
565 goto out_unlock;
566
567 entry = list_first_entry(&bdev->ddestroy,
568 struct ttm_buffer_object, ddestroy);
569 kref_get(&entry->list_kref);
570
571 for (;;) {
572 struct ttm_buffer_object *nentry = NULL;
573
574 if (entry->ddestroy.next != &bdev->ddestroy) {
575 nentry = list_first_entry(&entry->ddestroy,
576 struct ttm_buffer_object, ddestroy);
577 kref_get(&nentry->list_kref);
578 }
579
580 ret = __ttm_bo_reserve(entry, false, true, false, 0);
581 if (remove_all && ret) {
582 spin_unlock(&glob->lru_lock);
583 ret = __ttm_bo_reserve(entry, false, false,
584 false, 0);
585 spin_lock(&glob->lru_lock);
586 }
587
588 if (!ret)
589 ret = ttm_bo_cleanup_refs_and_unlock(entry, false,
590 !remove_all);
591 else
592 spin_unlock(&glob->lru_lock);
593
594 kref_put(&entry->list_kref, ttm_bo_release_list);
595 entry = nentry;
596
597 if (ret || !entry)
598 goto out;
599
600 spin_lock(&glob->lru_lock);
601 if (list_empty(&entry->ddestroy))
602 break;
603 }
604
605out_unlock:
606 spin_unlock(&glob->lru_lock);
607out:
608 if (entry)
609 kref_put(&entry->list_kref, ttm_bo_release_list);
610 return ret;
611}
612
613static void ttm_bo_delayed_workqueue(struct work_struct *work)
614{
615 struct ttm_bo_device *bdev =
616 container_of(work, struct ttm_bo_device, wq.work);
617
618 if (ttm_bo_delayed_delete(bdev, false)) {
619 schedule_delayed_work(&bdev->wq,
620 ((HZ / 100) < 1) ? 1 : HZ / 100);
621 }
622}
623
624static void ttm_bo_release(struct kref *kref)
625{
626 struct ttm_buffer_object *bo =
627 container_of(kref, struct ttm_buffer_object, kref);
628 struct ttm_bo_device *bdev = bo->bdev;
629 struct ttm_mem_type_manager *man = &bdev->man[bo->mem.mem_type];
630
631 drm_vma_offset_remove(&bdev->vma_manager, &bo->vma_node);
632 ttm_mem_io_lock(man, false);
633 ttm_mem_io_free_vm(bo);
634 ttm_mem_io_unlock(man);
635 ttm_bo_cleanup_refs_or_queue(bo);
636 kref_put(&bo->list_kref, ttm_bo_release_list);
637}
638
639void ttm_bo_unref(struct ttm_buffer_object **p_bo)
640{
641 struct ttm_buffer_object *bo = *p_bo;
642
643 *p_bo = NULL;
644 kref_put(&bo->kref, ttm_bo_release);
645}
646EXPORT_SYMBOL(ttm_bo_unref);
647
648int ttm_bo_lock_delayed_workqueue(struct ttm_bo_device *bdev)
649{
650 return cancel_delayed_work_sync(&bdev->wq);
651}
652EXPORT_SYMBOL(ttm_bo_lock_delayed_workqueue);
653
654void ttm_bo_unlock_delayed_workqueue(struct ttm_bo_device *bdev, int resched)
655{
656 if (resched)
657 schedule_delayed_work(&bdev->wq,
658 ((HZ / 100) < 1) ? 1 : HZ / 100);
659}
660EXPORT_SYMBOL(ttm_bo_unlock_delayed_workqueue);
661
662static int ttm_bo_evict(struct ttm_buffer_object *bo, bool interruptible,
663 bool no_wait_gpu)
664{
665 struct ttm_bo_device *bdev = bo->bdev;
666 struct ttm_mem_reg evict_mem;
667 struct ttm_placement placement;
668 int ret = 0;
669
670 spin_lock(&bdev->fence_lock);
671 ret = ttm_bo_wait(bo, false, interruptible, no_wait_gpu);
672 spin_unlock(&bdev->fence_lock);
673
674 if (unlikely(ret != 0)) {
675 if (ret != -ERESTARTSYS) {
676 pr_err("Failed to expire sync object before buffer eviction\n");
677 }
678 goto out;
679 }
680
681 lockdep_assert_held(&bo->resv->lock.base);
682
683 evict_mem = bo->mem;
684 evict_mem.mm_node = NULL;
685 evict_mem.bus.io_reserved_vm = false;
686 evict_mem.bus.io_reserved_count = 0;
687
688 placement.fpfn = 0;
689 placement.lpfn = 0;
690 placement.num_placement = 0;
691 placement.num_busy_placement = 0;
692 bdev->driver->evict_flags(bo, &placement);
693 ret = ttm_bo_mem_space(bo, &placement, &evict_mem, interruptible,
694 no_wait_gpu);
695 if (ret) {
696 if (ret != -ERESTARTSYS) {
697 pr_err("Failed to find memory space for buffer 0x%p eviction\n",
698 bo);
699 ttm_bo_mem_space_debug(bo, &placement);
700 }
701 goto out;
702 }
703
704 ret = ttm_bo_handle_move_mem(bo, &evict_mem, true, interruptible,
705 no_wait_gpu);
706 if (ret) {
707 if (ret != -ERESTARTSYS)
708 pr_err("Buffer eviction failed\n");
709 ttm_bo_mem_put(bo, &evict_mem);
710 goto out;
711 }
712 bo->evicted = true;
713out:
714 return ret;
715}
716
717static int ttm_mem_evict_first(struct ttm_bo_device *bdev,
718 uint32_t mem_type,
719 bool interruptible,
720 bool no_wait_gpu)
721{
722 struct ttm_bo_global *glob = bdev->glob;
723 struct ttm_mem_type_manager *man = &bdev->man[mem_type];
724 struct ttm_buffer_object *bo;
725 int ret = -EBUSY, put_count;
726
727 spin_lock(&glob->lru_lock);
728 list_for_each_entry(bo, &man->lru, lru) {
729 ret = __ttm_bo_reserve(bo, false, true, false, 0);
730 if (!ret)
731 break;
732 }
733
734 if (ret) {
735 spin_unlock(&glob->lru_lock);
736 return ret;
737 }
738
739 kref_get(&bo->list_kref);
740
741 if (!list_empty(&bo->ddestroy)) {
742 ret = ttm_bo_cleanup_refs_and_unlock(bo, interruptible,
743 no_wait_gpu);
744 kref_put(&bo->list_kref, ttm_bo_release_list);
745 return ret;
746 }
747
748 put_count = ttm_bo_del_from_lru(bo);
749 spin_unlock(&glob->lru_lock);
750
751 BUG_ON(ret != 0);
752
753 ttm_bo_list_ref_sub(bo, put_count, true);
754
755 ret = ttm_bo_evict(bo, interruptible, no_wait_gpu);
756 ttm_bo_unreserve(bo);
757
758 kref_put(&bo->list_kref, ttm_bo_release_list);
759 return ret;
760}
761
762void ttm_bo_mem_put(struct ttm_buffer_object *bo, struct ttm_mem_reg *mem)
763{
764 struct ttm_mem_type_manager *man = &bo->bdev->man[mem->mem_type];
765
766 if (mem->mm_node)
767 (*man->func->put_node)(man, mem);
768}
769EXPORT_SYMBOL(ttm_bo_mem_put);
770
771/**
772 * Repeatedly evict memory from the LRU for @mem_type until we create enough
773 * space, or we've evicted everything and there isn't enough space.
774 */
775static int ttm_bo_mem_force_space(struct ttm_buffer_object *bo,
776 uint32_t mem_type,
777 struct ttm_placement *placement,
778 struct ttm_mem_reg *mem,
779 bool interruptible,
780 bool no_wait_gpu)
781{
782 struct ttm_bo_device *bdev = bo->bdev;
783 struct ttm_mem_type_manager *man = &bdev->man[mem_type];
784 int ret;
785
786 do {
787 ret = (*man->func->get_node)(man, bo, placement, mem);
788 if (unlikely(ret != 0))
789 return ret;
790 if (mem->mm_node)
791 break;
792 ret = ttm_mem_evict_first(bdev, mem_type,
793 interruptible, no_wait_gpu);
794 if (unlikely(ret != 0))
795 return ret;
796 } while (1);
797 if (mem->mm_node == NULL)
798 return -ENOMEM;
799 mem->mem_type = mem_type;
800 return 0;
801}
802
803static uint32_t ttm_bo_select_caching(struct ttm_mem_type_manager *man,
804 uint32_t cur_placement,
805 uint32_t proposed_placement)
806{
807 uint32_t caching = proposed_placement & TTM_PL_MASK_CACHING;
808 uint32_t result = proposed_placement & ~TTM_PL_MASK_CACHING;
809
810 /**
811 * Keep current caching if possible.
812 */
813
814 if ((cur_placement & caching) != 0)
815 result |= (cur_placement & caching);
816 else if ((man->default_caching & caching) != 0)
817 result |= man->default_caching;
818 else if ((TTM_PL_FLAG_CACHED & caching) != 0)
819 result |= TTM_PL_FLAG_CACHED;
820 else if ((TTM_PL_FLAG_WC & caching) != 0)
821 result |= TTM_PL_FLAG_WC;
822 else if ((TTM_PL_FLAG_UNCACHED & caching) != 0)
823 result |= TTM_PL_FLAG_UNCACHED;
824
825 return result;
826}
827
828static bool ttm_bo_mt_compatible(struct ttm_mem_type_manager *man,
829 uint32_t mem_type,
830 uint32_t proposed_placement,
831 uint32_t *masked_placement)
832{
833 uint32_t cur_flags = ttm_bo_type_flags(mem_type);
834
835 if ((cur_flags & proposed_placement & TTM_PL_MASK_MEM) == 0)
836 return false;
837
838 if ((proposed_placement & man->available_caching) == 0)
839 return false;
840
841 cur_flags |= (proposed_placement & man->available_caching);
842
843 *masked_placement = cur_flags;
844 return true;
845}
846
847/**
848 * Creates space for memory region @mem according to its type.
849 *
850 * This function first searches for free space in compatible memory types in
851 * the priority order defined by the driver. If free space isn't found, then
852 * ttm_bo_mem_force_space is attempted in priority order to evict and find
853 * space.
854 */
855int ttm_bo_mem_space(struct ttm_buffer_object *bo,
856 struct ttm_placement *placement,
857 struct ttm_mem_reg *mem,
858 bool interruptible,
859 bool no_wait_gpu)
860{
861 struct ttm_bo_device *bdev = bo->bdev;
862 struct ttm_mem_type_manager *man;
863 uint32_t mem_type = TTM_PL_SYSTEM;
864 uint32_t cur_flags = 0;
865 bool type_found = false;
866 bool type_ok = false;
867 bool has_erestartsys = false;
868 int i, ret;
869
870 mem->mm_node = NULL;
871 for (i = 0; i < placement->num_placement; ++i) {
872 ret = ttm_mem_type_from_flags(placement->placement[i],
873 &mem_type);
874 if (ret)
875 return ret;
876 man = &bdev->man[mem_type];
877
878 type_ok = ttm_bo_mt_compatible(man,
879 mem_type,
880 placement->placement[i],
881 &cur_flags);
882
883 if (!type_ok)
884 continue;
885
886 cur_flags = ttm_bo_select_caching(man, bo->mem.placement,
887 cur_flags);
888 /*
889 * Use the access and other non-mapping-related flag bits from
890 * the memory placement flags to the current flags
891 */
892 ttm_flag_masked(&cur_flags, placement->placement[i],
893 ~TTM_PL_MASK_MEMTYPE);
894
895 if (mem_type == TTM_PL_SYSTEM)
896 break;
897
898 if (man->has_type && man->use_type) {
899 type_found = true;
900 ret = (*man->func->get_node)(man, bo, placement, mem);
901 if (unlikely(ret))
902 return ret;
903 }
904 if (mem->mm_node)
905 break;
906 }
907
908 if ((type_ok && (mem_type == TTM_PL_SYSTEM)) || mem->mm_node) {
909 mem->mem_type = mem_type;
910 mem->placement = cur_flags;
911 return 0;
912 }
913
914 if (!type_found)
915 return -EINVAL;
916
917 for (i = 0; i < placement->num_busy_placement; ++i) {
918 ret = ttm_mem_type_from_flags(placement->busy_placement[i],
919 &mem_type);
920 if (ret)
921 return ret;
922 man = &bdev->man[mem_type];
923 if (!man->has_type)
924 continue;
925 if (!ttm_bo_mt_compatible(man,
926 mem_type,
927 placement->busy_placement[i],
928 &cur_flags))
929 continue;
930
931 cur_flags = ttm_bo_select_caching(man, bo->mem.placement,
932 cur_flags);
933 /*
934 * Use the access and other non-mapping-related flag bits from
935 * the memory placement flags to the current flags
936 */
937 ttm_flag_masked(&cur_flags, placement->busy_placement[i],
938 ~TTM_PL_MASK_MEMTYPE);
939
940
941 if (mem_type == TTM_PL_SYSTEM) {
942 mem->mem_type = mem_type;
943 mem->placement = cur_flags;
944 mem->mm_node = NULL;
945 return 0;
946 }
947
948 ret = ttm_bo_mem_force_space(bo, mem_type, placement, mem,
949 interruptible, no_wait_gpu);
950 if (ret == 0 && mem->mm_node) {
951 mem->placement = cur_flags;
952 return 0;
953 }
954 if (ret == -ERESTARTSYS)
955 has_erestartsys = true;
956 }
957 ret = (has_erestartsys) ? -ERESTARTSYS : -ENOMEM;
958 return ret;
959}
960EXPORT_SYMBOL(ttm_bo_mem_space);
961
962static int ttm_bo_move_buffer(struct ttm_buffer_object *bo,
963 struct ttm_placement *placement,
964 bool interruptible,
965 bool no_wait_gpu)
966{
967 int ret = 0;
968 struct ttm_mem_reg mem;
969 struct ttm_bo_device *bdev = bo->bdev;
970
971 lockdep_assert_held(&bo->resv->lock.base);
972
973 /*
974 * FIXME: It's possible to pipeline buffer moves.
975 * Have the driver move function wait for idle when necessary,
976 * instead of doing it here.
977 */
978 spin_lock(&bdev->fence_lock);
979 ret = ttm_bo_wait(bo, false, interruptible, no_wait_gpu);
980 spin_unlock(&bdev->fence_lock);
981 if (ret)
982 return ret;
983 mem.num_pages = bo->num_pages;
984 mem.size = mem.num_pages << PAGE_SHIFT;
985 mem.page_alignment = bo->mem.page_alignment;
986 mem.bus.io_reserved_vm = false;
987 mem.bus.io_reserved_count = 0;
988 /*
989 * Determine where to move the buffer.
990 */
991 ret = ttm_bo_mem_space(bo, placement, &mem,
992 interruptible, no_wait_gpu);
993 if (ret)
994 goto out_unlock;
995 ret = ttm_bo_handle_move_mem(bo, &mem, false,
996 interruptible, no_wait_gpu);
997out_unlock:
998 if (ret && mem.mm_node)
999 ttm_bo_mem_put(bo, &mem);
1000 return ret;
1001}
1002
1003static bool ttm_bo_mem_compat(struct ttm_placement *placement,
1004 struct ttm_mem_reg *mem,
1005 uint32_t *new_flags)
1006{
1007 int i;
1008
1009 if (mem->mm_node && placement->lpfn != 0 &&
1010 (mem->start < placement->fpfn ||
1011 mem->start + mem->num_pages > placement->lpfn))
1012 return false;
1013
1014 for (i = 0; i < placement->num_placement; i++) {
1015 *new_flags = placement->placement[i];
1016 if ((*new_flags & mem->placement & TTM_PL_MASK_CACHING) &&
1017 (*new_flags & mem->placement & TTM_PL_MASK_MEM))
1018 return true;
1019 }
1020
1021 for (i = 0; i < placement->num_busy_placement; i++) {
1022 *new_flags = placement->busy_placement[i];
1023 if ((*new_flags & mem->placement & TTM_PL_MASK_CACHING) &&
1024 (*new_flags & mem->placement & TTM_PL_MASK_MEM))
1025 return true;
1026 }
1027
1028 return false;
1029}
1030
1031int ttm_bo_validate(struct ttm_buffer_object *bo,
1032 struct ttm_placement *placement,
1033 bool interruptible,
1034 bool no_wait_gpu)
1035{
1036 int ret;
1037 uint32_t new_flags;
1038
1039 lockdep_assert_held(&bo->resv->lock.base);
1040 /* Check that range is valid */
1041 if (placement->lpfn || placement->fpfn)
1042 if (placement->fpfn > placement->lpfn ||
1043 (placement->lpfn - placement->fpfn) < bo->num_pages)
1044 return -EINVAL;
1045 /*
1046 * Check whether we need to move buffer.
1047 */
1048 if (!ttm_bo_mem_compat(placement, &bo->mem, &new_flags)) {
1049 ret = ttm_bo_move_buffer(bo, placement, interruptible,
1050 no_wait_gpu);
1051 if (ret)
1052 return ret;
1053 } else {
1054 /*
1055 * Use the access and other non-mapping-related flag bits from
1056 * the compatible memory placement flags to the active flags
1057 */
1058 ttm_flag_masked(&bo->mem.placement, new_flags,
1059 ~TTM_PL_MASK_MEMTYPE);
1060 }
1061 /*
1062 * We might need to add a TTM.
1063 */
1064 if (bo->mem.mem_type == TTM_PL_SYSTEM && bo->ttm == NULL) {
1065 ret = ttm_bo_add_ttm(bo, true);
1066 if (ret)
1067 return ret;
1068 }
1069 return 0;
1070}
1071EXPORT_SYMBOL(ttm_bo_validate);
1072
1073int ttm_bo_check_placement(struct ttm_buffer_object *bo,
1074 struct ttm_placement *placement)
1075{
1076 BUG_ON((placement->fpfn || placement->lpfn) &&
1077 (bo->mem.num_pages > (placement->lpfn - placement->fpfn)));
1078
1079 return 0;
1080}
1081
1082int ttm_bo_init(struct ttm_bo_device *bdev,
1083 struct ttm_buffer_object *bo,
1084 unsigned long size,
1085 enum ttm_bo_type type,
1086 struct ttm_placement *placement,
1087 uint32_t page_alignment,
1088 bool interruptible,
1089 struct file *persistent_swap_storage,
1090 size_t acc_size,
1091 struct sg_table *sg,
1092 void (*destroy) (struct ttm_buffer_object *))
1093{
1094 int ret = 0;
1095 unsigned long num_pages;
1096 struct ttm_mem_global *mem_glob = bdev->glob->mem_glob;
1097 bool locked;
1098
1099 ret = ttm_mem_global_alloc(mem_glob, acc_size, false, false);
1100 if (ret) {
1101 pr_err("Out of kernel memory\n");
1102 if (destroy)
1103 (*destroy)(bo);
1104 else
1105 kfree(bo);
1106 return -ENOMEM;
1107 }
1108
1109 num_pages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
1110 if (num_pages == 0) {
1111 pr_err("Illegal buffer object size\n");
1112 if (destroy)
1113 (*destroy)(bo);
1114 else
1115 kfree(bo);
1116 ttm_mem_global_free(mem_glob, acc_size);
1117 return -EINVAL;
1118 }
1119 bo->destroy = destroy;
1120
1121 kref_init(&bo->kref);
1122 kref_init(&bo->list_kref);
1123 atomic_set(&bo->cpu_writers, 0);
1124 INIT_LIST_HEAD(&bo->lru);
1125 INIT_LIST_HEAD(&bo->ddestroy);
1126 INIT_LIST_HEAD(&bo->swap);
1127 INIT_LIST_HEAD(&bo->io_reserve_lru);
1128 mutex_init(&bo->wu_mutex);
1129 bo->bdev = bdev;
1130 bo->glob = bdev->glob;
1131 bo->type = type;
1132 bo->num_pages = num_pages;
1133 bo->mem.size = num_pages << PAGE_SHIFT;
1134 bo->mem.mem_type = TTM_PL_SYSTEM;
1135 bo->mem.num_pages = bo->num_pages;
1136 bo->mem.mm_node = NULL;
1137 bo->mem.page_alignment = page_alignment;
1138 bo->mem.bus.io_reserved_vm = false;
1139 bo->mem.bus.io_reserved_count = 0;
1140 bo->priv_flags = 0;
1141 bo->mem.placement = (TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED);
1142 bo->persistent_swap_storage = persistent_swap_storage;
1143 bo->acc_size = acc_size;
1144 bo->sg = sg;
1145 bo->resv = &bo->ttm_resv;
1146 reservation_object_init(bo->resv);
1147 atomic_inc(&bo->glob->bo_count);
1148 drm_vma_node_reset(&bo->vma_node);
1149
1150 ret = ttm_bo_check_placement(bo, placement);
1151
1152 /*
1153 * For ttm_bo_type_device buffers, allocate
1154 * address space from the device.
1155 */
1156 if (likely(!ret) &&
1157 (bo->type == ttm_bo_type_device ||
1158 bo->type == ttm_bo_type_sg))
1159 ret = drm_vma_offset_add(&bdev->vma_manager, &bo->vma_node,
1160 bo->mem.num_pages);
1161
1162 locked = ww_mutex_trylock(&bo->resv->lock);
1163 WARN_ON(!locked);
1164
1165 if (likely(!ret))
1166 ret = ttm_bo_validate(bo, placement, interruptible, false);
1167
1168 ttm_bo_unreserve(bo);
1169
1170 if (unlikely(ret))
1171 ttm_bo_unref(&bo);
1172
1173 return ret;
1174}
1175EXPORT_SYMBOL(ttm_bo_init);
1176
1177size_t ttm_bo_acc_size(struct ttm_bo_device *bdev,
1178 unsigned long bo_size,
1179 unsigned struct_size)
1180{
1181 unsigned npages = (PAGE_ALIGN(bo_size)) >> PAGE_SHIFT;
1182 size_t size = 0;
1183
1184 size += ttm_round_pot(struct_size);
1185 size += PAGE_ALIGN(npages * sizeof(void *));
1186 size += ttm_round_pot(sizeof(struct ttm_tt));
1187 return size;
1188}
1189EXPORT_SYMBOL(ttm_bo_acc_size);
1190
1191size_t ttm_bo_dma_acc_size(struct ttm_bo_device *bdev,
1192 unsigned long bo_size,
1193 unsigned struct_size)
1194{
1195 unsigned npages = (PAGE_ALIGN(bo_size)) >> PAGE_SHIFT;
1196 size_t size = 0;
1197
1198 size += ttm_round_pot(struct_size);
1199 size += PAGE_ALIGN(npages * sizeof(void *));
1200 size += PAGE_ALIGN(npages * sizeof(dma_addr_t));
1201 size += ttm_round_pot(sizeof(struct ttm_dma_tt));
1202 return size;
1203}
1204EXPORT_SYMBOL(ttm_bo_dma_acc_size);
1205
1206int ttm_bo_create(struct ttm_bo_device *bdev,
1207 unsigned long size,
1208 enum ttm_bo_type type,
1209 struct ttm_placement *placement,
1210 uint32_t page_alignment,
1211 bool interruptible,
1212 struct file *persistent_swap_storage,
1213 struct ttm_buffer_object **p_bo)
1214{
1215 struct ttm_buffer_object *bo;
1216 size_t acc_size;
1217 int ret;
1218
1219 bo = kzalloc(sizeof(*bo), GFP_KERNEL);
1220 if (unlikely(bo == NULL))
1221 return -ENOMEM;
1222
1223 acc_size = ttm_bo_acc_size(bdev, size, sizeof(struct ttm_buffer_object));
1224 ret = ttm_bo_init(bdev, bo, size, type, placement, page_alignment,
1225 interruptible, persistent_swap_storage, acc_size,
1226 NULL, NULL);
1227 if (likely(ret == 0))
1228 *p_bo = bo;
1229
1230 return ret;
1231}
1232EXPORT_SYMBOL(ttm_bo_create);
1233
1234static int ttm_bo_force_list_clean(struct ttm_bo_device *bdev,
1235 unsigned mem_type, bool allow_errors)
1236{
1237 struct ttm_mem_type_manager *man = &bdev->man[mem_type];
1238 struct ttm_bo_global *glob = bdev->glob;
1239 int ret;
1240
1241 /*
1242 * Can't use standard list traversal since we're unlocking.
1243 */
1244
1245 spin_lock(&glob->lru_lock);
1246 while (!list_empty(&man->lru)) {
1247 spin_unlock(&glob->lru_lock);
1248 ret = ttm_mem_evict_first(bdev, mem_type, false, false);
1249 if (ret) {
1250 if (allow_errors) {
1251 return ret;
1252 } else {
1253 pr_err("Cleanup eviction failed\n");
1254 }
1255 }
1256 spin_lock(&glob->lru_lock);
1257 }
1258 spin_unlock(&glob->lru_lock);
1259 return 0;
1260}
1261
1262int ttm_bo_clean_mm(struct ttm_bo_device *bdev, unsigned mem_type)
1263{
1264 struct ttm_mem_type_manager *man;
1265 int ret = -EINVAL;
1266
1267 if (mem_type >= TTM_NUM_MEM_TYPES) {
1268 pr_err("Illegal memory type %d\n", mem_type);
1269 return ret;
1270 }
1271 man = &bdev->man[mem_type];
1272
1273 if (!man->has_type) {
1274 pr_err("Trying to take down uninitialized memory manager type %u\n",
1275 mem_type);
1276 return ret;
1277 }
1278
1279 man->use_type = false;
1280 man->has_type = false;
1281
1282 ret = 0;
1283 if (mem_type > 0) {
1284 ttm_bo_force_list_clean(bdev, mem_type, false);
1285
1286 ret = (*man->func->takedown)(man);
1287 }
1288
1289 return ret;
1290}
1291EXPORT_SYMBOL(ttm_bo_clean_mm);
1292
1293int ttm_bo_evict_mm(struct ttm_bo_device *bdev, unsigned mem_type)
1294{
1295 struct ttm_mem_type_manager *man = &bdev->man[mem_type];
1296
1297 if (mem_type == 0 || mem_type >= TTM_NUM_MEM_TYPES) {
1298 pr_err("Illegal memory manager memory type %u\n", mem_type);
1299 return -EINVAL;
1300 }
1301
1302 if (!man->has_type) {
1303 pr_err("Memory type %u has not been initialized\n", mem_type);
1304 return 0;
1305 }
1306
1307 return ttm_bo_force_list_clean(bdev, mem_type, true);
1308}
1309EXPORT_SYMBOL(ttm_bo_evict_mm);
1310
1311int ttm_bo_init_mm(struct ttm_bo_device *bdev, unsigned type,
1312 unsigned long p_size)
1313{
1314 int ret = -EINVAL;
1315 struct ttm_mem_type_manager *man;
1316
1317 BUG_ON(type >= TTM_NUM_MEM_TYPES);
1318 man = &bdev->man[type];
1319 BUG_ON(man->has_type);
1320 man->io_reserve_fastpath = true;
1321 man->use_io_reserve_lru = false;
1322 mutex_init(&man->io_reserve_mutex);
1323 INIT_LIST_HEAD(&man->io_reserve_lru);
1324
1325 ret = bdev->driver->init_mem_type(bdev, type, man);
1326 if (ret)
1327 return ret;
1328 man->bdev = bdev;
1329
1330 ret = 0;
1331 if (type != TTM_PL_SYSTEM) {
1332 ret = (*man->func->init)(man, p_size);
1333 if (ret)
1334 return ret;
1335 }
1336 man->has_type = true;
1337 man->use_type = true;
1338 man->size = p_size;
1339
1340 INIT_LIST_HEAD(&man->lru);
1341
1342 return 0;
1343}
1344EXPORT_SYMBOL(ttm_bo_init_mm);
1345
1346static void ttm_bo_global_kobj_release(struct kobject *kobj)
1347{
1348 struct ttm_bo_global *glob =
1349 container_of(kobj, struct ttm_bo_global, kobj);
1350
1351 ttm_mem_unregister_shrink(glob->mem_glob, &glob->shrink);
1352 __free_page(glob->dummy_read_page);
1353 kfree(glob);
1354}
1355
1356void ttm_bo_global_release(struct drm_global_reference *ref)
1357{
1358 struct ttm_bo_global *glob = ref->object;
1359
1360 kobject_del(&glob->kobj);
1361 kobject_put(&glob->kobj);
1362}
1363EXPORT_SYMBOL(ttm_bo_global_release);
1364
1365int ttm_bo_global_init(struct drm_global_reference *ref)
1366{
1367 struct ttm_bo_global_ref *bo_ref =
1368 container_of(ref, struct ttm_bo_global_ref, ref);
1369 struct ttm_bo_global *glob = ref->object;
1370 int ret;
1371
1372 mutex_init(&glob->device_list_mutex);
1373 spin_lock_init(&glob->lru_lock);
1374 glob->mem_glob = bo_ref->mem_glob;
1375 glob->dummy_read_page = alloc_page(__GFP_ZERO | GFP_DMA32);
1376
1377 if (unlikely(glob->dummy_read_page == NULL)) {
1378 ret = -ENOMEM;
1379 goto out_no_drp;
1380 }
1381
1382 INIT_LIST_HEAD(&glob->swap_lru);
1383 INIT_LIST_HEAD(&glob->device_list);
1384
1385 ttm_mem_init_shrink(&glob->shrink, ttm_bo_swapout);
1386 ret = ttm_mem_register_shrink(glob->mem_glob, &glob->shrink);
1387 if (unlikely(ret != 0)) {
1388 pr_err("Could not register buffer object swapout\n");
1389 goto out_no_shrink;
1390 }
1391
1392 atomic_set(&glob->bo_count, 0);
1393
1394 ret = kobject_init_and_add(
1395 &glob->kobj, &ttm_bo_glob_kobj_type, ttm_get_kobj(), "buffer_objects");
1396 if (unlikely(ret != 0))
1397 kobject_put(&glob->kobj);
1398 return ret;
1399out_no_shrink:
1400 __free_page(glob->dummy_read_page);
1401out_no_drp:
1402 kfree(glob);
1403 return ret;
1404}
1405EXPORT_SYMBOL(ttm_bo_global_init);
1406
1407
1408int ttm_bo_device_release(struct ttm_bo_device *bdev)
1409{
1410 int ret = 0;
1411 unsigned i = TTM_NUM_MEM_TYPES;
1412 struct ttm_mem_type_manager *man;
1413 struct ttm_bo_global *glob = bdev->glob;
1414
1415 while (i--) {
1416 man = &bdev->man[i];
1417 if (man->has_type) {
1418 man->use_type = false;
1419 if ((i != TTM_PL_SYSTEM) && ttm_bo_clean_mm(bdev, i)) {
1420 ret = -EBUSY;
1421 pr_err("DRM memory manager type %d is not clean\n",
1422 i);
1423 }
1424 man->has_type = false;
1425 }
1426 }
1427
1428 mutex_lock(&glob->device_list_mutex);
1429 list_del(&bdev->device_list);
1430 mutex_unlock(&glob->device_list_mutex);
1431
1432 cancel_delayed_work_sync(&bdev->wq);
1433
1434 while (ttm_bo_delayed_delete(bdev, true))
1435 ;
1436
1437 spin_lock(&glob->lru_lock);
1438 if (list_empty(&bdev->ddestroy))
1439 TTM_DEBUG("Delayed destroy list was clean\n");
1440
1441 if (list_empty(&bdev->man[0].lru))
1442 TTM_DEBUG("Swap list was clean\n");
1443 spin_unlock(&glob->lru_lock);
1444
1445 drm_vma_offset_manager_destroy(&bdev->vma_manager);
1446
1447 return ret;
1448}
1449EXPORT_SYMBOL(ttm_bo_device_release);
1450
1451int ttm_bo_device_init(struct ttm_bo_device *bdev,
1452 struct ttm_bo_global *glob,
1453 struct ttm_bo_driver *driver,
1454 struct address_space *mapping,
1455 uint64_t file_page_offset,
1456 bool need_dma32)
1457{
1458 int ret = -EINVAL;
1459
1460 bdev->driver = driver;
1461
1462 memset(bdev->man, 0, sizeof(bdev->man));
1463
1464 /*
1465 * Initialize the system memory buffer type.
1466 * Other types need to be driver / IOCTL initialized.
1467 */
1468 ret = ttm_bo_init_mm(bdev, TTM_PL_SYSTEM, 0);
1469 if (unlikely(ret != 0))
1470 goto out_no_sys;
1471
1472 drm_vma_offset_manager_init(&bdev->vma_manager, file_page_offset,
1473 0x10000000);
1474 INIT_DELAYED_WORK(&bdev->wq, ttm_bo_delayed_workqueue);
1475 INIT_LIST_HEAD(&bdev->ddestroy);
1476 bdev->dev_mapping = mapping;
1477 bdev->glob = glob;
1478 bdev->need_dma32 = need_dma32;
1479 bdev->val_seq = 0;
1480 spin_lock_init(&bdev->fence_lock);
1481 mutex_lock(&glob->device_list_mutex);
1482 list_add_tail(&bdev->device_list, &glob->device_list);
1483 mutex_unlock(&glob->device_list_mutex);
1484
1485 return 0;
1486out_no_sys:
1487 return ret;
1488}
1489EXPORT_SYMBOL(ttm_bo_device_init);
1490
1491/*
1492 * buffer object vm functions.
1493 */
1494
1495bool ttm_mem_reg_is_pci(struct ttm_bo_device *bdev, struct ttm_mem_reg *mem)
1496{
1497 struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
1498
1499 if (!(man->flags & TTM_MEMTYPE_FLAG_FIXED)) {
1500 if (mem->mem_type == TTM_PL_SYSTEM)
1501 return false;
1502
1503 if (man->flags & TTM_MEMTYPE_FLAG_CMA)
1504 return false;
1505
1506 if (mem->placement & TTM_PL_FLAG_CACHED)
1507 return false;
1508 }
1509 return true;
1510}
1511
1512void ttm_bo_unmap_virtual_locked(struct ttm_buffer_object *bo)
1513{
1514 struct ttm_bo_device *bdev = bo->bdev;
1515
1516 drm_vma_node_unmap(&bo->vma_node, bdev->dev_mapping);
1517 ttm_mem_io_free_vm(bo);
1518}
1519
1520void ttm_bo_unmap_virtual(struct ttm_buffer_object *bo)
1521{
1522 struct ttm_bo_device *bdev = bo->bdev;
1523 struct ttm_mem_type_manager *man = &bdev->man[bo->mem.mem_type];
1524
1525 ttm_mem_io_lock(man, false);
1526 ttm_bo_unmap_virtual_locked(bo);
1527 ttm_mem_io_unlock(man);
1528}
1529
1530
1531EXPORT_SYMBOL(ttm_bo_unmap_virtual);
1532
1533
1534int ttm_bo_wait(struct ttm_buffer_object *bo,
1535 bool lazy, bool interruptible, bool no_wait)
1536{
1537 struct ttm_bo_driver *driver = bo->bdev->driver;
1538 struct ttm_bo_device *bdev = bo->bdev;
1539 void *sync_obj;
1540 int ret = 0;
1541
1542 if (likely(bo->sync_obj == NULL))
1543 return 0;
1544
1545 while (bo->sync_obj) {
1546
1547 if (driver->sync_obj_signaled(bo->sync_obj)) {
1548 void *tmp_obj = bo->sync_obj;
1549 bo->sync_obj = NULL;
1550 clear_bit(TTM_BO_PRIV_FLAG_MOVING, &bo->priv_flags);
1551 spin_unlock(&bdev->fence_lock);
1552 driver->sync_obj_unref(&tmp_obj);
1553 spin_lock(&bdev->fence_lock);
1554 continue;
1555 }
1556
1557 if (no_wait)
1558 return -EBUSY;
1559
1560 sync_obj = driver->sync_obj_ref(bo->sync_obj);
1561 spin_unlock(&bdev->fence_lock);
1562 ret = driver->sync_obj_wait(sync_obj,
1563 lazy, interruptible);
1564 if (unlikely(ret != 0)) {
1565 driver->sync_obj_unref(&sync_obj);
1566 spin_lock(&bdev->fence_lock);
1567 return ret;
1568 }
1569 spin_lock(&bdev->fence_lock);
1570 if (likely(bo->sync_obj == sync_obj)) {
1571 void *tmp_obj = bo->sync_obj;
1572 bo->sync_obj = NULL;
1573 clear_bit(TTM_BO_PRIV_FLAG_MOVING,
1574 &bo->priv_flags);
1575 spin_unlock(&bdev->fence_lock);
1576 driver->sync_obj_unref(&sync_obj);
1577 driver->sync_obj_unref(&tmp_obj);
1578 spin_lock(&bdev->fence_lock);
1579 } else {
1580 spin_unlock(&bdev->fence_lock);
1581 driver->sync_obj_unref(&sync_obj);
1582 spin_lock(&bdev->fence_lock);
1583 }
1584 }
1585 return 0;
1586}
1587EXPORT_SYMBOL(ttm_bo_wait);
1588
1589int ttm_bo_synccpu_write_grab(struct ttm_buffer_object *bo, bool no_wait)
1590{
1591 struct ttm_bo_device *bdev = bo->bdev;
1592 int ret = 0;
1593
1594 /*
1595 * Using ttm_bo_reserve makes sure the lru lists are updated.
1596 */
1597
1598 ret = ttm_bo_reserve(bo, true, no_wait, false, 0);
1599 if (unlikely(ret != 0))
1600 return ret;
1601 spin_lock(&bdev->fence_lock);
1602 ret = ttm_bo_wait(bo, false, true, no_wait);
1603 spin_unlock(&bdev->fence_lock);
1604 if (likely(ret == 0))
1605 atomic_inc(&bo->cpu_writers);
1606 ttm_bo_unreserve(bo);
1607 return ret;
1608}
1609EXPORT_SYMBOL(ttm_bo_synccpu_write_grab);
1610
1611void ttm_bo_synccpu_write_release(struct ttm_buffer_object *bo)
1612{
1613 atomic_dec(&bo->cpu_writers);
1614}
1615EXPORT_SYMBOL(ttm_bo_synccpu_write_release);
1616
1617/**
1618 * A buffer object shrink method that tries to swap out the first
1619 * buffer object on the bo_global::swap_lru list.
1620 */
1621
1622static int ttm_bo_swapout(struct ttm_mem_shrink *shrink)
1623{
1624 struct ttm_bo_global *glob =
1625 container_of(shrink, struct ttm_bo_global, shrink);
1626 struct ttm_buffer_object *bo;
1627 int ret = -EBUSY;
1628 int put_count;
1629 uint32_t swap_placement = (TTM_PL_FLAG_CACHED | TTM_PL_FLAG_SYSTEM);
1630
1631 spin_lock(&glob->lru_lock);
1632 list_for_each_entry(bo, &glob->swap_lru, swap) {
1633 ret = __ttm_bo_reserve(bo, false, true, false, 0);
1634 if (!ret)
1635 break;
1636 }
1637
1638 if (ret) {
1639 spin_unlock(&glob->lru_lock);
1640 return ret;
1641 }
1642
1643 kref_get(&bo->list_kref);
1644
1645 if (!list_empty(&bo->ddestroy)) {
1646 ret = ttm_bo_cleanup_refs_and_unlock(bo, false, false);
1647 kref_put(&bo->list_kref, ttm_bo_release_list);
1648 return ret;
1649 }
1650
1651 put_count = ttm_bo_del_from_lru(bo);
1652 spin_unlock(&glob->lru_lock);
1653
1654 ttm_bo_list_ref_sub(bo, put_count, true);
1655
1656 /**
1657 * Wait for GPU, then move to system cached.
1658 */
1659
1660 spin_lock(&bo->bdev->fence_lock);
1661 ret = ttm_bo_wait(bo, false, false, false);
1662 spin_unlock(&bo->bdev->fence_lock);
1663
1664 if (unlikely(ret != 0))
1665 goto out;
1666
1667 if ((bo->mem.placement & swap_placement) != swap_placement) {
1668 struct ttm_mem_reg evict_mem;
1669
1670 evict_mem = bo->mem;
1671 evict_mem.mm_node = NULL;
1672 evict_mem.placement = TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED;
1673 evict_mem.mem_type = TTM_PL_SYSTEM;
1674
1675 ret = ttm_bo_handle_move_mem(bo, &evict_mem, true,
1676 false, false);
1677 if (unlikely(ret != 0))
1678 goto out;
1679 }
1680
1681 ttm_bo_unmap_virtual(bo);
1682
1683 /**
1684 * Swap out. Buffer will be swapped in again as soon as
1685 * anyone tries to access a ttm page.
1686 */
1687
1688 if (bo->bdev->driver->swap_notify)
1689 bo->bdev->driver->swap_notify(bo);
1690
1691 ret = ttm_tt_swapout(bo->ttm, bo->persistent_swap_storage);
1692out:
1693
1694 /**
1695 *
1696 * Unreserve without putting on LRU to avoid swapping out an
1697 * already swapped buffer.
1698 */
1699
1700 __ttm_bo_unreserve(bo);
1701 kref_put(&bo->list_kref, ttm_bo_release_list);
1702 return ret;
1703}
1704
1705void ttm_bo_swapout_all(struct ttm_bo_device *bdev)
1706{
1707 while (ttm_bo_swapout(&bdev->glob->shrink) == 0)
1708 ;
1709}
1710EXPORT_SYMBOL(ttm_bo_swapout_all);
1711
1712/**
1713 * ttm_bo_wait_unreserved - interruptible wait for a buffer object to become
1714 * unreserved
1715 *
1716 * @bo: Pointer to buffer
1717 */
1718int ttm_bo_wait_unreserved(struct ttm_buffer_object *bo)
1719{
1720 int ret;
1721
1722 /*
1723 * In the absense of a wait_unlocked API,
1724 * Use the bo::wu_mutex to avoid triggering livelocks due to
1725 * concurrent use of this function. Note that this use of
1726 * bo::wu_mutex can go away if we change locking order to
1727 * mmap_sem -> bo::reserve.
1728 */
1729 ret = mutex_lock_interruptible(&bo->wu_mutex);
1730 if (unlikely(ret != 0))
1731 return -ERESTARTSYS;
1732 if (!ww_mutex_is_locked(&bo->resv->lock))
1733 goto out_unlock;
1734 ret = __ttm_bo_reserve(bo, true, false, false, NULL);
1735 if (unlikely(ret != 0))
1736 goto out_unlock;
1737 __ttm_bo_unreserve(bo);
1738
1739out_unlock:
1740 mutex_unlock(&bo->wu_mutex);
1741 return ret;
1742}