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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/* SPDX-License-Identifier: GPL-2.0 OR MIT */
2/**************************************************************************
3 *
4 * Copyright (c) 2006-2009 VMware, Inc., Palo Alto, CA., USA
5 * All Rights Reserved.
6 *
7 * Permission is hereby granted, free of charge, to any person obtaining a
8 * copy of this software and associated documentation files (the
9 * "Software"), to deal in the Software without restriction, including
10 * without limitation the rights to use, copy, modify, merge, publish,
11 * distribute, sub license, and/or sell copies of the Software, and to
12 * permit persons to whom the Software is furnished to do so, subject to
13 * the following conditions:
14 *
15 * The above copyright notice and this permission notice (including the
16 * next paragraph) shall be included in all copies or substantial portions
17 * of the Software.
18 *
19 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
20 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
21 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
22 * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
23 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
24 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
25 * USE OR OTHER DEALINGS IN THE SOFTWARE.
26 *
27 **************************************************************************/
28/*
29 * Authors: Thomas Hellstrom <thellstrom-at-vmware-dot-com>
30 */
31
32#define pr_fmt(fmt) "[TTM] " fmt
33
34#include <drm/ttm/ttm_module.h>
35#include <drm/ttm/ttm_bo_driver.h>
36#include <drm/ttm/ttm_placement.h>
37#include <linux/jiffies.h>
38#include <linux/slab.h>
39#include <linux/sched.h>
40#include <linux/mm.h>
41#include <linux/file.h>
42#include <linux/module.h>
43#include <linux/atomic.h>
44#include <linux/dma-resv.h>
45
46static void ttm_bo_global_kobj_release(struct kobject *kobj);
47
48/**
49 * ttm_global_mutex - protecting the global BO state
50 */
51DEFINE_MUTEX(ttm_global_mutex);
52unsigned ttm_bo_glob_use_count;
53struct ttm_bo_global ttm_bo_glob;
54EXPORT_SYMBOL(ttm_bo_glob);
55
56static struct attribute ttm_bo_count = {
57 .name = "bo_count",
58 .mode = S_IRUGO
59};
60
61/* default destructor */
62static void ttm_bo_default_destroy(struct ttm_buffer_object *bo)
63{
64 kfree(bo);
65}
66
67static inline int ttm_mem_type_from_place(const struct ttm_place *place,
68 uint32_t *mem_type)
69{
70 int pos;
71
72 pos = ffs(place->flags & TTM_PL_MASK_MEM);
73 if (unlikely(!pos))
74 return -EINVAL;
75
76 *mem_type = pos - 1;
77 return 0;
78}
79
80static void ttm_mem_type_debug(struct ttm_bo_device *bdev, struct drm_printer *p,
81 int mem_type)
82{
83 struct ttm_mem_type_manager *man = &bdev->man[mem_type];
84
85 drm_printf(p, " has_type: %d\n", man->has_type);
86 drm_printf(p, " use_type: %d\n", man->use_type);
87 drm_printf(p, " flags: 0x%08X\n", man->flags);
88 drm_printf(p, " size: %llu\n", man->size);
89 drm_printf(p, " available_caching: 0x%08X\n", man->available_caching);
90 drm_printf(p, " default_caching: 0x%08X\n", man->default_caching);
91 if (mem_type != TTM_PL_SYSTEM)
92 (*man->func->debug)(man, p);
93}
94
95static void ttm_bo_mem_space_debug(struct ttm_buffer_object *bo,
96 struct ttm_placement *placement)
97{
98 struct drm_printer p = drm_debug_printer(TTM_PFX);
99 int i, ret, mem_type;
100
101 drm_printf(&p, "No space for %p (%lu pages, %luK, %luM)\n",
102 bo, bo->mem.num_pages, bo->mem.size >> 10,
103 bo->mem.size >> 20);
104 for (i = 0; i < placement->num_placement; i++) {
105 ret = ttm_mem_type_from_place(&placement->placement[i],
106 &mem_type);
107 if (ret)
108 return;
109 drm_printf(&p, " placement[%d]=0x%08X (%d)\n",
110 i, placement->placement[i].flags, mem_type);
111 ttm_mem_type_debug(bo->bdev, &p, mem_type);
112 }
113}
114
115static ssize_t ttm_bo_global_show(struct kobject *kobj,
116 struct attribute *attr,
117 char *buffer)
118{
119 struct ttm_bo_global *glob =
120 container_of(kobj, struct ttm_bo_global, kobj);
121
122 return snprintf(buffer, PAGE_SIZE, "%d\n",
123 atomic_read(&glob->bo_count));
124}
125
126static struct attribute *ttm_bo_global_attrs[] = {
127 &ttm_bo_count,
128 NULL
129};
130
131static const struct sysfs_ops ttm_bo_global_ops = {
132 .show = &ttm_bo_global_show
133};
134
135static struct kobj_type ttm_bo_glob_kobj_type = {
136 .release = &ttm_bo_global_kobj_release,
137 .sysfs_ops = &ttm_bo_global_ops,
138 .default_attrs = ttm_bo_global_attrs
139};
140
141
142static inline uint32_t ttm_bo_type_flags(unsigned type)
143{
144 return 1 << (type);
145}
146
147static void ttm_bo_add_mem_to_lru(struct ttm_buffer_object *bo,
148 struct ttm_mem_reg *mem)
149{
150 struct ttm_bo_device *bdev = bo->bdev;
151 struct ttm_mem_type_manager *man;
152
153 if (!list_empty(&bo->lru))
154 return;
155
156 if (mem->placement & TTM_PL_FLAG_NO_EVICT)
157 return;
158
159 man = &bdev->man[mem->mem_type];
160 list_add_tail(&bo->lru, &man->lru[bo->priority]);
161
162 if (!(man->flags & TTM_MEMTYPE_FLAG_FIXED) && bo->ttm &&
163 !(bo->ttm->page_flags & (TTM_PAGE_FLAG_SG |
164 TTM_PAGE_FLAG_SWAPPED))) {
165 list_add_tail(&bo->swap, &ttm_bo_glob.swap_lru[bo->priority]);
166 }
167}
168
169static void ttm_bo_del_from_lru(struct ttm_buffer_object *bo)
170{
171 struct ttm_bo_device *bdev = bo->bdev;
172 bool notify = false;
173
174 if (!list_empty(&bo->swap)) {
175 list_del_init(&bo->swap);
176 notify = true;
177 }
178 if (!list_empty(&bo->lru)) {
179 list_del_init(&bo->lru);
180 notify = true;
181 }
182
183 if (notify && bdev->driver->del_from_lru_notify)
184 bdev->driver->del_from_lru_notify(bo);
185}
186
187static void ttm_bo_bulk_move_set_pos(struct ttm_lru_bulk_move_pos *pos,
188 struct ttm_buffer_object *bo)
189{
190 if (!pos->first)
191 pos->first = bo;
192 pos->last = bo;
193}
194
195void ttm_bo_move_to_lru_tail(struct ttm_buffer_object *bo,
196 struct ttm_lru_bulk_move *bulk)
197{
198 dma_resv_assert_held(bo->base.resv);
199
200 ttm_bo_del_from_lru(bo);
201 ttm_bo_add_mem_to_lru(bo, &bo->mem);
202
203 if (bulk && !(bo->mem.placement & TTM_PL_FLAG_NO_EVICT)) {
204 switch (bo->mem.mem_type) {
205 case TTM_PL_TT:
206 ttm_bo_bulk_move_set_pos(&bulk->tt[bo->priority], bo);
207 break;
208
209 case TTM_PL_VRAM:
210 ttm_bo_bulk_move_set_pos(&bulk->vram[bo->priority], bo);
211 break;
212 }
213 if (bo->ttm && !(bo->ttm->page_flags &
214 (TTM_PAGE_FLAG_SG | TTM_PAGE_FLAG_SWAPPED)))
215 ttm_bo_bulk_move_set_pos(&bulk->swap[bo->priority], bo);
216 }
217}
218EXPORT_SYMBOL(ttm_bo_move_to_lru_tail);
219
220void ttm_bo_bulk_move_lru_tail(struct ttm_lru_bulk_move *bulk)
221{
222 unsigned i;
223
224 for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i) {
225 struct ttm_lru_bulk_move_pos *pos = &bulk->tt[i];
226 struct ttm_mem_type_manager *man;
227
228 if (!pos->first)
229 continue;
230
231 dma_resv_assert_held(pos->first->base.resv);
232 dma_resv_assert_held(pos->last->base.resv);
233
234 man = &pos->first->bdev->man[TTM_PL_TT];
235 list_bulk_move_tail(&man->lru[i], &pos->first->lru,
236 &pos->last->lru);
237 }
238
239 for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i) {
240 struct ttm_lru_bulk_move_pos *pos = &bulk->vram[i];
241 struct ttm_mem_type_manager *man;
242
243 if (!pos->first)
244 continue;
245
246 dma_resv_assert_held(pos->first->base.resv);
247 dma_resv_assert_held(pos->last->base.resv);
248
249 man = &pos->first->bdev->man[TTM_PL_VRAM];
250 list_bulk_move_tail(&man->lru[i], &pos->first->lru,
251 &pos->last->lru);
252 }
253
254 for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i) {
255 struct ttm_lru_bulk_move_pos *pos = &bulk->swap[i];
256 struct list_head *lru;
257
258 if (!pos->first)
259 continue;
260
261 dma_resv_assert_held(pos->first->base.resv);
262 dma_resv_assert_held(pos->last->base.resv);
263
264 lru = &ttm_bo_glob.swap_lru[i];
265 list_bulk_move_tail(lru, &pos->first->swap, &pos->last->swap);
266 }
267}
268EXPORT_SYMBOL(ttm_bo_bulk_move_lru_tail);
269
270static int ttm_bo_handle_move_mem(struct ttm_buffer_object *bo,
271 struct ttm_mem_reg *mem, bool evict,
272 struct ttm_operation_ctx *ctx)
273{
274 struct ttm_bo_device *bdev = bo->bdev;
275 struct ttm_mem_type_manager *old_man = &bdev->man[bo->mem.mem_type];
276 struct ttm_mem_type_manager *new_man = &bdev->man[mem->mem_type];
277 int ret;
278
279 ret = ttm_mem_io_lock(old_man, true);
280 if (unlikely(ret != 0))
281 goto out_err;
282 ttm_bo_unmap_virtual_locked(bo);
283 ttm_mem_io_unlock(old_man);
284
285 /*
286 * Create and bind a ttm if required.
287 */
288
289 if (!(new_man->flags & TTM_MEMTYPE_FLAG_FIXED)) {
290 if (bo->ttm == NULL) {
291 bool zero = !(old_man->flags & TTM_MEMTYPE_FLAG_FIXED);
292 ret = ttm_tt_create(bo, zero);
293 if (ret)
294 goto out_err;
295 }
296
297 ret = ttm_tt_set_placement_caching(bo->ttm, mem->placement);
298 if (ret)
299 goto out_err;
300
301 if (mem->mem_type != TTM_PL_SYSTEM) {
302 ret = ttm_tt_bind(bo->ttm, mem, ctx);
303 if (ret)
304 goto out_err;
305 }
306
307 if (bo->mem.mem_type == TTM_PL_SYSTEM) {
308 if (bdev->driver->move_notify)
309 bdev->driver->move_notify(bo, evict, mem);
310 bo->mem = *mem;
311 goto moved;
312 }
313 }
314
315 if (bdev->driver->move_notify)
316 bdev->driver->move_notify(bo, evict, mem);
317
318 if (!(old_man->flags & TTM_MEMTYPE_FLAG_FIXED) &&
319 !(new_man->flags & TTM_MEMTYPE_FLAG_FIXED))
320 ret = ttm_bo_move_ttm(bo, ctx, mem);
321 else if (bdev->driver->move)
322 ret = bdev->driver->move(bo, evict, ctx, mem);
323 else
324 ret = ttm_bo_move_memcpy(bo, ctx, mem);
325
326 if (ret) {
327 if (bdev->driver->move_notify) {
328 swap(*mem, bo->mem);
329 bdev->driver->move_notify(bo, false, mem);
330 swap(*mem, bo->mem);
331 }
332
333 goto out_err;
334 }
335
336moved:
337 bo->evicted = false;
338
339 ctx->bytes_moved += bo->num_pages << PAGE_SHIFT;
340 return 0;
341
342out_err:
343 new_man = &bdev->man[bo->mem.mem_type];
344 if (new_man->flags & TTM_MEMTYPE_FLAG_FIXED) {
345 ttm_tt_destroy(bo->ttm);
346 bo->ttm = NULL;
347 }
348
349 return ret;
350}
351
352/**
353 * Call bo::reserved.
354 * Will release GPU memory type usage on destruction.
355 * This is the place to put in driver specific hooks to release
356 * driver private resources.
357 * Will release the bo::reserved lock.
358 */
359
360static void ttm_bo_cleanup_memtype_use(struct ttm_buffer_object *bo)
361{
362 if (bo->bdev->driver->move_notify)
363 bo->bdev->driver->move_notify(bo, false, NULL);
364
365 ttm_tt_destroy(bo->ttm);
366 bo->ttm = NULL;
367 ttm_bo_mem_put(bo, &bo->mem);
368}
369
370static int ttm_bo_individualize_resv(struct ttm_buffer_object *bo)
371{
372 int r;
373
374 if (bo->base.resv == &bo->base._resv)
375 return 0;
376
377 BUG_ON(!dma_resv_trylock(&bo->base._resv));
378
379 r = dma_resv_copy_fences(&bo->base._resv, bo->base.resv);
380 dma_resv_unlock(&bo->base._resv);
381 if (r)
382 return r;
383
384 if (bo->type != ttm_bo_type_sg) {
385 /* This works because the BO is about to be destroyed and nobody
386 * reference it any more. The only tricky case is the trylock on
387 * the resv object while holding the lru_lock.
388 */
389 spin_lock(&ttm_bo_glob.lru_lock);
390 bo->base.resv = &bo->base._resv;
391 spin_unlock(&ttm_bo_glob.lru_lock);
392 }
393
394 return r;
395}
396
397static void ttm_bo_flush_all_fences(struct ttm_buffer_object *bo)
398{
399 struct dma_resv *resv = &bo->base._resv;
400 struct dma_resv_list *fobj;
401 struct dma_fence *fence;
402 int i;
403
404 rcu_read_lock();
405 fobj = rcu_dereference(resv->fence);
406 fence = rcu_dereference(resv->fence_excl);
407 if (fence && !fence->ops->signaled)
408 dma_fence_enable_sw_signaling(fence);
409
410 for (i = 0; fobj && i < fobj->shared_count; ++i) {
411 fence = rcu_dereference(fobj->shared[i]);
412
413 if (!fence->ops->signaled)
414 dma_fence_enable_sw_signaling(fence);
415 }
416 rcu_read_unlock();
417}
418
419/**
420 * function ttm_bo_cleanup_refs
421 * If bo idle, remove from lru lists, and unref.
422 * If not idle, block if possible.
423 *
424 * Must be called with lru_lock and reservation held, this function
425 * will drop the lru lock and optionally the reservation lock before returning.
426 *
427 * @interruptible Any sleeps should occur interruptibly.
428 * @no_wait_gpu Never wait for gpu. Return -EBUSY instead.
429 * @unlock_resv Unlock the reservation lock as well.
430 */
431
432static int ttm_bo_cleanup_refs(struct ttm_buffer_object *bo,
433 bool interruptible, bool no_wait_gpu,
434 bool unlock_resv)
435{
436 struct dma_resv *resv = &bo->base._resv;
437 int ret;
438
439 if (dma_resv_test_signaled_rcu(resv, true))
440 ret = 0;
441 else
442 ret = -EBUSY;
443
444 if (ret && !no_wait_gpu) {
445 long lret;
446
447 if (unlock_resv)
448 dma_resv_unlock(bo->base.resv);
449 spin_unlock(&ttm_bo_glob.lru_lock);
450
451 lret = dma_resv_wait_timeout_rcu(resv, true, interruptible,
452 30 * HZ);
453
454 if (lret < 0)
455 return lret;
456 else if (lret == 0)
457 return -EBUSY;
458
459 spin_lock(&ttm_bo_glob.lru_lock);
460 if (unlock_resv && !dma_resv_trylock(bo->base.resv)) {
461 /*
462 * We raced, and lost, someone else holds the reservation now,
463 * and is probably busy in ttm_bo_cleanup_memtype_use.
464 *
465 * Even if it's not the case, because we finished waiting any
466 * delayed destruction would succeed, so just return success
467 * here.
468 */
469 spin_unlock(&ttm_bo_glob.lru_lock);
470 return 0;
471 }
472 ret = 0;
473 }
474
475 if (ret || unlikely(list_empty(&bo->ddestroy))) {
476 if (unlock_resv)
477 dma_resv_unlock(bo->base.resv);
478 spin_unlock(&ttm_bo_glob.lru_lock);
479 return ret;
480 }
481
482 ttm_bo_del_from_lru(bo);
483 list_del_init(&bo->ddestroy);
484 spin_unlock(&ttm_bo_glob.lru_lock);
485 ttm_bo_cleanup_memtype_use(bo);
486
487 if (unlock_resv)
488 dma_resv_unlock(bo->base.resv);
489
490 ttm_bo_put(bo);
491
492 return 0;
493}
494
495/**
496 * Traverse the delayed list, and call ttm_bo_cleanup_refs on all
497 * encountered buffers.
498 */
499static bool ttm_bo_delayed_delete(struct ttm_bo_device *bdev, bool remove_all)
500{
501 struct ttm_bo_global *glob = &ttm_bo_glob;
502 struct list_head removed;
503 bool empty;
504
505 INIT_LIST_HEAD(&removed);
506
507 spin_lock(&glob->lru_lock);
508 while (!list_empty(&bdev->ddestroy)) {
509 struct ttm_buffer_object *bo;
510
511 bo = list_first_entry(&bdev->ddestroy, struct ttm_buffer_object,
512 ddestroy);
513 list_move_tail(&bo->ddestroy, &removed);
514 if (!ttm_bo_get_unless_zero(bo))
515 continue;
516
517 if (remove_all || bo->base.resv != &bo->base._resv) {
518 spin_unlock(&glob->lru_lock);
519 dma_resv_lock(bo->base.resv, NULL);
520
521 spin_lock(&glob->lru_lock);
522 ttm_bo_cleanup_refs(bo, false, !remove_all, true);
523
524 } else if (dma_resv_trylock(bo->base.resv)) {
525 ttm_bo_cleanup_refs(bo, false, !remove_all, true);
526 } else {
527 spin_unlock(&glob->lru_lock);
528 }
529
530 ttm_bo_put(bo);
531 spin_lock(&glob->lru_lock);
532 }
533 list_splice_tail(&removed, &bdev->ddestroy);
534 empty = list_empty(&bdev->ddestroy);
535 spin_unlock(&glob->lru_lock);
536
537 return empty;
538}
539
540static void ttm_bo_delayed_workqueue(struct work_struct *work)
541{
542 struct ttm_bo_device *bdev =
543 container_of(work, struct ttm_bo_device, wq.work);
544
545 if (!ttm_bo_delayed_delete(bdev, false))
546 schedule_delayed_work(&bdev->wq,
547 ((HZ / 100) < 1) ? 1 : HZ / 100);
548}
549
550static void ttm_bo_release(struct kref *kref)
551{
552 struct ttm_buffer_object *bo =
553 container_of(kref, struct ttm_buffer_object, kref);
554 struct ttm_bo_device *bdev = bo->bdev;
555 struct ttm_mem_type_manager *man = &bdev->man[bo->mem.mem_type];
556 size_t acc_size = bo->acc_size;
557 int ret;
558
559 if (!bo->deleted) {
560 ret = ttm_bo_individualize_resv(bo);
561 if (ret) {
562 /* Last resort, if we fail to allocate memory for the
563 * fences block for the BO to become idle
564 */
565 dma_resv_wait_timeout_rcu(bo->base.resv, true, false,
566 30 * HZ);
567 }
568
569 if (bo->bdev->driver->release_notify)
570 bo->bdev->driver->release_notify(bo);
571
572 drm_vma_offset_remove(bdev->vma_manager, &bo->base.vma_node);
573 ttm_mem_io_lock(man, false);
574 ttm_mem_io_free_vm(bo);
575 ttm_mem_io_unlock(man);
576 }
577
578 if (!dma_resv_test_signaled_rcu(bo->base.resv, true) ||
579 !dma_resv_trylock(bo->base.resv)) {
580 /* The BO is not idle, resurrect it for delayed destroy */
581 ttm_bo_flush_all_fences(bo);
582 bo->deleted = true;
583
584 spin_lock(&ttm_bo_glob.lru_lock);
585
586 /*
587 * Make NO_EVICT bos immediately available to
588 * shrinkers, now that they are queued for
589 * destruction.
590 */
591 if (bo->mem.placement & TTM_PL_FLAG_NO_EVICT) {
592 bo->mem.placement &= ~TTM_PL_FLAG_NO_EVICT;
593 ttm_bo_del_from_lru(bo);
594 ttm_bo_add_mem_to_lru(bo, &bo->mem);
595 }
596
597 kref_init(&bo->kref);
598 list_add_tail(&bo->ddestroy, &bdev->ddestroy);
599 spin_unlock(&ttm_bo_glob.lru_lock);
600
601 schedule_delayed_work(&bdev->wq,
602 ((HZ / 100) < 1) ? 1 : HZ / 100);
603 return;
604 }
605
606 spin_lock(&ttm_bo_glob.lru_lock);
607 ttm_bo_del_from_lru(bo);
608 list_del(&bo->ddestroy);
609 spin_unlock(&ttm_bo_glob.lru_lock);
610
611 ttm_bo_cleanup_memtype_use(bo);
612 dma_resv_unlock(bo->base.resv);
613
614 atomic_dec(&ttm_bo_glob.bo_count);
615 dma_fence_put(bo->moving);
616 if (!ttm_bo_uses_embedded_gem_object(bo))
617 dma_resv_fini(&bo->base._resv);
618 bo->destroy(bo);
619 ttm_mem_global_free(&ttm_mem_glob, acc_size);
620}
621
622void ttm_bo_put(struct ttm_buffer_object *bo)
623{
624 kref_put(&bo->kref, ttm_bo_release);
625}
626EXPORT_SYMBOL(ttm_bo_put);
627
628int ttm_bo_lock_delayed_workqueue(struct ttm_bo_device *bdev)
629{
630 return cancel_delayed_work_sync(&bdev->wq);
631}
632EXPORT_SYMBOL(ttm_bo_lock_delayed_workqueue);
633
634void ttm_bo_unlock_delayed_workqueue(struct ttm_bo_device *bdev, int resched)
635{
636 if (resched)
637 schedule_delayed_work(&bdev->wq,
638 ((HZ / 100) < 1) ? 1 : HZ / 100);
639}
640EXPORT_SYMBOL(ttm_bo_unlock_delayed_workqueue);
641
642static int ttm_bo_evict(struct ttm_buffer_object *bo,
643 struct ttm_operation_ctx *ctx)
644{
645 struct ttm_bo_device *bdev = bo->bdev;
646 struct ttm_mem_reg evict_mem;
647 struct ttm_placement placement;
648 int ret = 0;
649
650 dma_resv_assert_held(bo->base.resv);
651
652 placement.num_placement = 0;
653 placement.num_busy_placement = 0;
654 bdev->driver->evict_flags(bo, &placement);
655
656 if (!placement.num_placement && !placement.num_busy_placement) {
657 ret = ttm_bo_pipeline_gutting(bo);
658 if (ret)
659 return ret;
660
661 return ttm_tt_create(bo, false);
662 }
663
664 evict_mem = bo->mem;
665 evict_mem.mm_node = NULL;
666 evict_mem.bus.io_reserved_vm = false;
667 evict_mem.bus.io_reserved_count = 0;
668
669 ret = ttm_bo_mem_space(bo, &placement, &evict_mem, ctx);
670 if (ret) {
671 if (ret != -ERESTARTSYS) {
672 pr_err("Failed to find memory space for buffer 0x%p eviction\n",
673 bo);
674 ttm_bo_mem_space_debug(bo, &placement);
675 }
676 goto out;
677 }
678
679 ret = ttm_bo_handle_move_mem(bo, &evict_mem, true, ctx);
680 if (unlikely(ret)) {
681 if (ret != -ERESTARTSYS)
682 pr_err("Buffer eviction failed\n");
683 ttm_bo_mem_put(bo, &evict_mem);
684 goto out;
685 }
686 bo->evicted = true;
687out:
688 return ret;
689}
690
691bool ttm_bo_eviction_valuable(struct ttm_buffer_object *bo,
692 const struct ttm_place *place)
693{
694 /* Don't evict this BO if it's outside of the
695 * requested placement range
696 */
697 if (place->fpfn >= (bo->mem.start + bo->mem.size) ||
698 (place->lpfn && place->lpfn <= bo->mem.start))
699 return false;
700
701 return true;
702}
703EXPORT_SYMBOL(ttm_bo_eviction_valuable);
704
705/**
706 * Check the target bo is allowable to be evicted or swapout, including cases:
707 *
708 * a. if share same reservation object with ctx->resv, have assumption
709 * reservation objects should already be locked, so not lock again and
710 * return true directly when either the opreation allow_reserved_eviction
711 * or the target bo already is in delayed free list;
712 *
713 * b. Otherwise, trylock it.
714 */
715static bool ttm_bo_evict_swapout_allowable(struct ttm_buffer_object *bo,
716 struct ttm_operation_ctx *ctx, bool *locked, bool *busy)
717{
718 bool ret = false;
719
720 if (bo->base.resv == ctx->resv) {
721 dma_resv_assert_held(bo->base.resv);
722 if (ctx->flags & TTM_OPT_FLAG_ALLOW_RES_EVICT)
723 ret = true;
724 *locked = false;
725 if (busy)
726 *busy = false;
727 } else {
728 ret = dma_resv_trylock(bo->base.resv);
729 *locked = ret;
730 if (busy)
731 *busy = !ret;
732 }
733
734 return ret;
735}
736
737/**
738 * ttm_mem_evict_wait_busy - wait for a busy BO to become available
739 *
740 * @busy_bo: BO which couldn't be locked with trylock
741 * @ctx: operation context
742 * @ticket: acquire ticket
743 *
744 * Try to lock a busy buffer object to avoid failing eviction.
745 */
746static int ttm_mem_evict_wait_busy(struct ttm_buffer_object *busy_bo,
747 struct ttm_operation_ctx *ctx,
748 struct ww_acquire_ctx *ticket)
749{
750 int r;
751
752 if (!busy_bo || !ticket)
753 return -EBUSY;
754
755 if (ctx->interruptible)
756 r = dma_resv_lock_interruptible(busy_bo->base.resv,
757 ticket);
758 else
759 r = dma_resv_lock(busy_bo->base.resv, ticket);
760
761 /*
762 * TODO: It would be better to keep the BO locked until allocation is at
763 * least tried one more time, but that would mean a much larger rework
764 * of TTM.
765 */
766 if (!r)
767 dma_resv_unlock(busy_bo->base.resv);
768
769 return r == -EDEADLK ? -EBUSY : r;
770}
771
772static int ttm_mem_evict_first(struct ttm_bo_device *bdev,
773 uint32_t mem_type,
774 const struct ttm_place *place,
775 struct ttm_operation_ctx *ctx,
776 struct ww_acquire_ctx *ticket)
777{
778 struct ttm_buffer_object *bo = NULL, *busy_bo = NULL;
779 struct ttm_mem_type_manager *man = &bdev->man[mem_type];
780 bool locked = false;
781 unsigned i;
782 int ret;
783
784 spin_lock(&ttm_bo_glob.lru_lock);
785 for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i) {
786 list_for_each_entry(bo, &man->lru[i], lru) {
787 bool busy;
788
789 if (!ttm_bo_evict_swapout_allowable(bo, ctx, &locked,
790 &busy)) {
791 if (busy && !busy_bo && ticket !=
792 dma_resv_locking_ctx(bo->base.resv))
793 busy_bo = bo;
794 continue;
795 }
796
797 if (place && !bdev->driver->eviction_valuable(bo,
798 place)) {
799 if (locked)
800 dma_resv_unlock(bo->base.resv);
801 continue;
802 }
803 if (!ttm_bo_get_unless_zero(bo)) {
804 if (locked)
805 dma_resv_unlock(bo->base.resv);
806 continue;
807 }
808 break;
809 }
810
811 /* If the inner loop terminated early, we have our candidate */
812 if (&bo->lru != &man->lru[i])
813 break;
814
815 bo = NULL;
816 }
817
818 if (!bo) {
819 if (busy_bo && !ttm_bo_get_unless_zero(busy_bo))
820 busy_bo = NULL;
821 spin_unlock(&ttm_bo_glob.lru_lock);
822 ret = ttm_mem_evict_wait_busy(busy_bo, ctx, ticket);
823 if (busy_bo)
824 ttm_bo_put(busy_bo);
825 return ret;
826 }
827
828 if (bo->deleted) {
829 ret = ttm_bo_cleanup_refs(bo, ctx->interruptible,
830 ctx->no_wait_gpu, locked);
831 ttm_bo_put(bo);
832 return ret;
833 }
834
835 spin_unlock(&ttm_bo_glob.lru_lock);
836
837 ret = ttm_bo_evict(bo, ctx);
838 if (locked)
839 ttm_bo_unreserve(bo);
840
841 ttm_bo_put(bo);
842 return ret;
843}
844
845static int ttm_bo_mem_get(struct ttm_buffer_object *bo,
846 const struct ttm_place *place,
847 struct ttm_mem_reg *mem)
848{
849 struct ttm_mem_type_manager *man = &bo->bdev->man[mem->mem_type];
850
851 mem->mm_node = NULL;
852 if (!man->func || !man->func->get_node)
853 return 0;
854
855 return man->func->get_node(man, bo, place, mem);
856}
857
858void ttm_bo_mem_put(struct ttm_buffer_object *bo, struct ttm_mem_reg *mem)
859{
860 struct ttm_mem_type_manager *man = &bo->bdev->man[mem->mem_type];
861
862 if (!man->func || !man->func->put_node)
863 return;
864
865 man->func->put_node(man, mem);
866 mem->mm_node = NULL;
867 mem->mem_type = TTM_PL_SYSTEM;
868}
869EXPORT_SYMBOL(ttm_bo_mem_put);
870
871/**
872 * Add the last move fence to the BO and reserve a new shared slot.
873 */
874static int ttm_bo_add_move_fence(struct ttm_buffer_object *bo,
875 struct ttm_mem_type_manager *man,
876 struct ttm_mem_reg *mem,
877 bool no_wait_gpu)
878{
879 struct dma_fence *fence;
880 int ret;
881
882 spin_lock(&man->move_lock);
883 fence = dma_fence_get(man->move);
884 spin_unlock(&man->move_lock);
885
886 if (!fence)
887 return 0;
888
889 if (no_wait_gpu) {
890 dma_fence_put(fence);
891 return -EBUSY;
892 }
893
894 dma_resv_add_shared_fence(bo->base.resv, fence);
895
896 ret = dma_resv_reserve_shared(bo->base.resv, 1);
897 if (unlikely(ret)) {
898 dma_fence_put(fence);
899 return ret;
900 }
901
902 dma_fence_put(bo->moving);
903 bo->moving = fence;
904 return 0;
905}
906
907/**
908 * Repeatedly evict memory from the LRU for @mem_type until we create enough
909 * space, or we've evicted everything and there isn't enough space.
910 */
911static int ttm_bo_mem_force_space(struct ttm_buffer_object *bo,
912 const struct ttm_place *place,
913 struct ttm_mem_reg *mem,
914 struct ttm_operation_ctx *ctx)
915{
916 struct ttm_bo_device *bdev = bo->bdev;
917 struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
918 struct ww_acquire_ctx *ticket;
919 int ret;
920
921 ticket = dma_resv_locking_ctx(bo->base.resv);
922 do {
923 ret = ttm_bo_mem_get(bo, place, mem);
924 if (likely(!ret))
925 break;
926 if (unlikely(ret != -ENOSPC))
927 return ret;
928 ret = ttm_mem_evict_first(bdev, mem->mem_type, place, ctx,
929 ticket);
930 if (unlikely(ret != 0))
931 return ret;
932 } while (1);
933
934 return ttm_bo_add_move_fence(bo, man, mem, ctx->no_wait_gpu);
935}
936
937static uint32_t ttm_bo_select_caching(struct ttm_mem_type_manager *man,
938 uint32_t cur_placement,
939 uint32_t proposed_placement)
940{
941 uint32_t caching = proposed_placement & TTM_PL_MASK_CACHING;
942 uint32_t result = proposed_placement & ~TTM_PL_MASK_CACHING;
943
944 /**
945 * Keep current caching if possible.
946 */
947
948 if ((cur_placement & caching) != 0)
949 result |= (cur_placement & caching);
950 else if ((man->default_caching & caching) != 0)
951 result |= man->default_caching;
952 else if ((TTM_PL_FLAG_CACHED & caching) != 0)
953 result |= TTM_PL_FLAG_CACHED;
954 else if ((TTM_PL_FLAG_WC & caching) != 0)
955 result |= TTM_PL_FLAG_WC;
956 else if ((TTM_PL_FLAG_UNCACHED & caching) != 0)
957 result |= TTM_PL_FLAG_UNCACHED;
958
959 return result;
960}
961
962static bool ttm_bo_mt_compatible(struct ttm_mem_type_manager *man,
963 uint32_t mem_type,
964 const struct ttm_place *place,
965 uint32_t *masked_placement)
966{
967 uint32_t cur_flags = ttm_bo_type_flags(mem_type);
968
969 if ((cur_flags & place->flags & TTM_PL_MASK_MEM) == 0)
970 return false;
971
972 if ((place->flags & man->available_caching) == 0)
973 return false;
974
975 cur_flags |= (place->flags & man->available_caching);
976
977 *masked_placement = cur_flags;
978 return true;
979}
980
981/**
982 * ttm_bo_mem_placement - check if placement is compatible
983 * @bo: BO to find memory for
984 * @place: where to search
985 * @mem: the memory object to fill in
986 * @ctx: operation context
987 *
988 * Check if placement is compatible and fill in mem structure.
989 * Returns -EBUSY if placement won't work or negative error code.
990 * 0 when placement can be used.
991 */
992static int ttm_bo_mem_placement(struct ttm_buffer_object *bo,
993 const struct ttm_place *place,
994 struct ttm_mem_reg *mem,
995 struct ttm_operation_ctx *ctx)
996{
997 struct ttm_bo_device *bdev = bo->bdev;
998 uint32_t mem_type = TTM_PL_SYSTEM;
999 struct ttm_mem_type_manager *man;
1000 uint32_t cur_flags = 0;
1001 int ret;
1002
1003 ret = ttm_mem_type_from_place(place, &mem_type);
1004 if (ret)
1005 return ret;
1006
1007 man = &bdev->man[mem_type];
1008 if (!man->has_type || !man->use_type)
1009 return -EBUSY;
1010
1011 if (!ttm_bo_mt_compatible(man, mem_type, place, &cur_flags))
1012 return -EBUSY;
1013
1014 cur_flags = ttm_bo_select_caching(man, bo->mem.placement, cur_flags);
1015 /*
1016 * Use the access and other non-mapping-related flag bits from
1017 * the memory placement flags to the current flags
1018 */
1019 ttm_flag_masked(&cur_flags, place->flags, ~TTM_PL_MASK_MEMTYPE);
1020
1021 mem->mem_type = mem_type;
1022 mem->placement = cur_flags;
1023
1024 spin_lock(&ttm_bo_glob.lru_lock);
1025 ttm_bo_del_from_lru(bo);
1026 ttm_bo_add_mem_to_lru(bo, mem);
1027 spin_unlock(&ttm_bo_glob.lru_lock);
1028
1029 return 0;
1030}
1031
1032/**
1033 * Creates space for memory region @mem according to its type.
1034 *
1035 * This function first searches for free space in compatible memory types in
1036 * the priority order defined by the driver. If free space isn't found, then
1037 * ttm_bo_mem_force_space is attempted in priority order to evict and find
1038 * space.
1039 */
1040int ttm_bo_mem_space(struct ttm_buffer_object *bo,
1041 struct ttm_placement *placement,
1042 struct ttm_mem_reg *mem,
1043 struct ttm_operation_ctx *ctx)
1044{
1045 struct ttm_bo_device *bdev = bo->bdev;
1046 bool type_found = false;
1047 int i, ret;
1048
1049 ret = dma_resv_reserve_shared(bo->base.resv, 1);
1050 if (unlikely(ret))
1051 return ret;
1052
1053 for (i = 0; i < placement->num_placement; ++i) {
1054 const struct ttm_place *place = &placement->placement[i];
1055 struct ttm_mem_type_manager *man;
1056
1057 ret = ttm_bo_mem_placement(bo, place, mem, ctx);
1058 if (ret == -EBUSY)
1059 continue;
1060 if (ret)
1061 goto error;
1062
1063 type_found = true;
1064 ret = ttm_bo_mem_get(bo, place, mem);
1065 if (ret == -ENOSPC)
1066 continue;
1067 if (unlikely(ret))
1068 goto error;
1069
1070 man = &bdev->man[mem->mem_type];
1071 ret = ttm_bo_add_move_fence(bo, man, mem, ctx->no_wait_gpu);
1072 if (unlikely(ret)) {
1073 ttm_bo_mem_put(bo, mem);
1074 if (ret == -EBUSY)
1075 continue;
1076
1077 goto error;
1078 }
1079 return 0;
1080 }
1081
1082 for (i = 0; i < placement->num_busy_placement; ++i) {
1083 const struct ttm_place *place = &placement->busy_placement[i];
1084
1085 ret = ttm_bo_mem_placement(bo, place, mem, ctx);
1086 if (ret == -EBUSY)
1087 continue;
1088 if (ret)
1089 goto error;
1090
1091 type_found = true;
1092 ret = ttm_bo_mem_force_space(bo, place, mem, ctx);
1093 if (likely(!ret))
1094 return 0;
1095
1096 if (ret && ret != -EBUSY)
1097 goto error;
1098 }
1099
1100 ret = -ENOMEM;
1101 if (!type_found) {
1102 pr_err(TTM_PFX "No compatible memory type found\n");
1103 ret = -EINVAL;
1104 }
1105
1106error:
1107 if (bo->mem.mem_type == TTM_PL_SYSTEM && !list_empty(&bo->lru)) {
1108 spin_lock(&ttm_bo_glob.lru_lock);
1109 ttm_bo_move_to_lru_tail(bo, NULL);
1110 spin_unlock(&ttm_bo_glob.lru_lock);
1111 }
1112
1113 return ret;
1114}
1115EXPORT_SYMBOL(ttm_bo_mem_space);
1116
1117static int ttm_bo_move_buffer(struct ttm_buffer_object *bo,
1118 struct ttm_placement *placement,
1119 struct ttm_operation_ctx *ctx)
1120{
1121 int ret = 0;
1122 struct ttm_mem_reg mem;
1123
1124 dma_resv_assert_held(bo->base.resv);
1125
1126 mem.num_pages = bo->num_pages;
1127 mem.size = mem.num_pages << PAGE_SHIFT;
1128 mem.page_alignment = bo->mem.page_alignment;
1129 mem.bus.io_reserved_vm = false;
1130 mem.bus.io_reserved_count = 0;
1131 mem.mm_node = NULL;
1132
1133 /*
1134 * Determine where to move the buffer.
1135 */
1136 ret = ttm_bo_mem_space(bo, placement, &mem, ctx);
1137 if (ret)
1138 goto out_unlock;
1139 ret = ttm_bo_handle_move_mem(bo, &mem, false, ctx);
1140out_unlock:
1141 if (ret)
1142 ttm_bo_mem_put(bo, &mem);
1143 return ret;
1144}
1145
1146static bool ttm_bo_places_compat(const struct ttm_place *places,
1147 unsigned num_placement,
1148 struct ttm_mem_reg *mem,
1149 uint32_t *new_flags)
1150{
1151 unsigned i;
1152
1153 for (i = 0; i < num_placement; i++) {
1154 const struct ttm_place *heap = &places[i];
1155
1156 if ((mem->start < heap->fpfn ||
1157 (heap->lpfn != 0 && (mem->start + mem->num_pages) > heap->lpfn)))
1158 continue;
1159
1160 *new_flags = heap->flags;
1161 if ((*new_flags & mem->placement & TTM_PL_MASK_CACHING) &&
1162 (*new_flags & mem->placement & TTM_PL_MASK_MEM) &&
1163 (!(*new_flags & TTM_PL_FLAG_CONTIGUOUS) ||
1164 (mem->placement & TTM_PL_FLAG_CONTIGUOUS)))
1165 return true;
1166 }
1167 return false;
1168}
1169
1170bool ttm_bo_mem_compat(struct ttm_placement *placement,
1171 struct ttm_mem_reg *mem,
1172 uint32_t *new_flags)
1173{
1174 if (ttm_bo_places_compat(placement->placement, placement->num_placement,
1175 mem, new_flags))
1176 return true;
1177
1178 if ((placement->busy_placement != placement->placement ||
1179 placement->num_busy_placement > placement->num_placement) &&
1180 ttm_bo_places_compat(placement->busy_placement,
1181 placement->num_busy_placement,
1182 mem, new_flags))
1183 return true;
1184
1185 return false;
1186}
1187EXPORT_SYMBOL(ttm_bo_mem_compat);
1188
1189int ttm_bo_validate(struct ttm_buffer_object *bo,
1190 struct ttm_placement *placement,
1191 struct ttm_operation_ctx *ctx)
1192{
1193 int ret;
1194 uint32_t new_flags;
1195
1196 dma_resv_assert_held(bo->base.resv);
1197
1198 /*
1199 * Remove the backing store if no placement is given.
1200 */
1201 if (!placement->num_placement && !placement->num_busy_placement) {
1202 ret = ttm_bo_pipeline_gutting(bo);
1203 if (ret)
1204 return ret;
1205
1206 return ttm_tt_create(bo, false);
1207 }
1208
1209 /*
1210 * Check whether we need to move buffer.
1211 */
1212 if (!ttm_bo_mem_compat(placement, &bo->mem, &new_flags)) {
1213 ret = ttm_bo_move_buffer(bo, placement, ctx);
1214 if (ret)
1215 return ret;
1216 } else {
1217 /*
1218 * Use the access and other non-mapping-related flag bits from
1219 * the compatible memory placement flags to the active flags
1220 */
1221 ttm_flag_masked(&bo->mem.placement, new_flags,
1222 ~TTM_PL_MASK_MEMTYPE);
1223 }
1224 /*
1225 * We might need to add a TTM.
1226 */
1227 if (bo->mem.mem_type == TTM_PL_SYSTEM && bo->ttm == NULL) {
1228 ret = ttm_tt_create(bo, true);
1229 if (ret)
1230 return ret;
1231 }
1232 return 0;
1233}
1234EXPORT_SYMBOL(ttm_bo_validate);
1235
1236int ttm_bo_init_reserved(struct ttm_bo_device *bdev,
1237 struct ttm_buffer_object *bo,
1238 unsigned long size,
1239 enum ttm_bo_type type,
1240 struct ttm_placement *placement,
1241 uint32_t page_alignment,
1242 struct ttm_operation_ctx *ctx,
1243 size_t acc_size,
1244 struct sg_table *sg,
1245 struct dma_resv *resv,
1246 void (*destroy) (struct ttm_buffer_object *))
1247{
1248 struct ttm_mem_global *mem_glob = &ttm_mem_glob;
1249 int ret = 0;
1250 unsigned long num_pages;
1251 bool locked;
1252
1253 ret = ttm_mem_global_alloc(mem_glob, acc_size, ctx);
1254 if (ret) {
1255 pr_err("Out of kernel memory\n");
1256 if (destroy)
1257 (*destroy)(bo);
1258 else
1259 kfree(bo);
1260 return -ENOMEM;
1261 }
1262
1263 num_pages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
1264 if (num_pages == 0) {
1265 pr_err("Illegal buffer object size\n");
1266 if (destroy)
1267 (*destroy)(bo);
1268 else
1269 kfree(bo);
1270 ttm_mem_global_free(mem_glob, acc_size);
1271 return -EINVAL;
1272 }
1273 bo->destroy = destroy ? destroy : ttm_bo_default_destroy;
1274
1275 kref_init(&bo->kref);
1276 INIT_LIST_HEAD(&bo->lru);
1277 INIT_LIST_HEAD(&bo->ddestroy);
1278 INIT_LIST_HEAD(&bo->swap);
1279 INIT_LIST_HEAD(&bo->io_reserve_lru);
1280 bo->bdev = bdev;
1281 bo->type = type;
1282 bo->num_pages = num_pages;
1283 bo->mem.size = num_pages << PAGE_SHIFT;
1284 bo->mem.mem_type = TTM_PL_SYSTEM;
1285 bo->mem.num_pages = bo->num_pages;
1286 bo->mem.mm_node = NULL;
1287 bo->mem.page_alignment = page_alignment;
1288 bo->mem.bus.io_reserved_vm = false;
1289 bo->mem.bus.io_reserved_count = 0;
1290 bo->moving = NULL;
1291 bo->mem.placement = (TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED);
1292 bo->acc_size = acc_size;
1293 bo->sg = sg;
1294 if (resv) {
1295 bo->base.resv = resv;
1296 dma_resv_assert_held(bo->base.resv);
1297 } else {
1298 bo->base.resv = &bo->base._resv;
1299 }
1300 if (!ttm_bo_uses_embedded_gem_object(bo)) {
1301 /*
1302 * bo.gem is not initialized, so we have to setup the
1303 * struct elements we want use regardless.
1304 */
1305 dma_resv_init(&bo->base._resv);
1306 drm_vma_node_reset(&bo->base.vma_node);
1307 }
1308 atomic_inc(&ttm_bo_glob.bo_count);
1309
1310 /*
1311 * For ttm_bo_type_device buffers, allocate
1312 * address space from the device.
1313 */
1314 if (bo->type == ttm_bo_type_device ||
1315 bo->type == ttm_bo_type_sg)
1316 ret = drm_vma_offset_add(bdev->vma_manager, &bo->base.vma_node,
1317 bo->mem.num_pages);
1318
1319 /* passed reservation objects should already be locked,
1320 * since otherwise lockdep will be angered in radeon.
1321 */
1322 if (!resv) {
1323 locked = dma_resv_trylock(bo->base.resv);
1324 WARN_ON(!locked);
1325 }
1326
1327 if (likely(!ret))
1328 ret = ttm_bo_validate(bo, placement, ctx);
1329
1330 if (unlikely(ret)) {
1331 if (!resv)
1332 ttm_bo_unreserve(bo);
1333
1334 ttm_bo_put(bo);
1335 return ret;
1336 }
1337
1338 spin_lock(&ttm_bo_glob.lru_lock);
1339 ttm_bo_move_to_lru_tail(bo, NULL);
1340 spin_unlock(&ttm_bo_glob.lru_lock);
1341
1342 return ret;
1343}
1344EXPORT_SYMBOL(ttm_bo_init_reserved);
1345
1346int ttm_bo_init(struct ttm_bo_device *bdev,
1347 struct ttm_buffer_object *bo,
1348 unsigned long size,
1349 enum ttm_bo_type type,
1350 struct ttm_placement *placement,
1351 uint32_t page_alignment,
1352 bool interruptible,
1353 size_t acc_size,
1354 struct sg_table *sg,
1355 struct dma_resv *resv,
1356 void (*destroy) (struct ttm_buffer_object *))
1357{
1358 struct ttm_operation_ctx ctx = { interruptible, false };
1359 int ret;
1360
1361 ret = ttm_bo_init_reserved(bdev, bo, size, type, placement,
1362 page_alignment, &ctx, acc_size,
1363 sg, resv, destroy);
1364 if (ret)
1365 return ret;
1366
1367 if (!resv)
1368 ttm_bo_unreserve(bo);
1369
1370 return 0;
1371}
1372EXPORT_SYMBOL(ttm_bo_init);
1373
1374size_t ttm_bo_acc_size(struct ttm_bo_device *bdev,
1375 unsigned long bo_size,
1376 unsigned struct_size)
1377{
1378 unsigned npages = (PAGE_ALIGN(bo_size)) >> PAGE_SHIFT;
1379 size_t size = 0;
1380
1381 size += ttm_round_pot(struct_size);
1382 size += ttm_round_pot(npages * sizeof(void *));
1383 size += ttm_round_pot(sizeof(struct ttm_tt));
1384 return size;
1385}
1386EXPORT_SYMBOL(ttm_bo_acc_size);
1387
1388size_t ttm_bo_dma_acc_size(struct ttm_bo_device *bdev,
1389 unsigned long bo_size,
1390 unsigned struct_size)
1391{
1392 unsigned npages = (PAGE_ALIGN(bo_size)) >> PAGE_SHIFT;
1393 size_t size = 0;
1394
1395 size += ttm_round_pot(struct_size);
1396 size += ttm_round_pot(npages * (2*sizeof(void *) + sizeof(dma_addr_t)));
1397 size += ttm_round_pot(sizeof(struct ttm_dma_tt));
1398 return size;
1399}
1400EXPORT_SYMBOL(ttm_bo_dma_acc_size);
1401
1402int ttm_bo_create(struct ttm_bo_device *bdev,
1403 unsigned long size,
1404 enum ttm_bo_type type,
1405 struct ttm_placement *placement,
1406 uint32_t page_alignment,
1407 bool interruptible,
1408 struct ttm_buffer_object **p_bo)
1409{
1410 struct ttm_buffer_object *bo;
1411 size_t acc_size;
1412 int ret;
1413
1414 bo = kzalloc(sizeof(*bo), GFP_KERNEL);
1415 if (unlikely(bo == NULL))
1416 return -ENOMEM;
1417
1418 acc_size = ttm_bo_acc_size(bdev, size, sizeof(struct ttm_buffer_object));
1419 ret = ttm_bo_init(bdev, bo, size, type, placement, page_alignment,
1420 interruptible, acc_size,
1421 NULL, NULL, NULL);
1422 if (likely(ret == 0))
1423 *p_bo = bo;
1424
1425 return ret;
1426}
1427EXPORT_SYMBOL(ttm_bo_create);
1428
1429static int ttm_bo_force_list_clean(struct ttm_bo_device *bdev,
1430 unsigned mem_type)
1431{
1432 struct ttm_operation_ctx ctx = {
1433 .interruptible = false,
1434 .no_wait_gpu = false,
1435 .flags = TTM_OPT_FLAG_FORCE_ALLOC
1436 };
1437 struct ttm_mem_type_manager *man = &bdev->man[mem_type];
1438 struct ttm_bo_global *glob = &ttm_bo_glob;
1439 struct dma_fence *fence;
1440 int ret;
1441 unsigned i;
1442
1443 /*
1444 * Can't use standard list traversal since we're unlocking.
1445 */
1446
1447 spin_lock(&glob->lru_lock);
1448 for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i) {
1449 while (!list_empty(&man->lru[i])) {
1450 spin_unlock(&glob->lru_lock);
1451 ret = ttm_mem_evict_first(bdev, mem_type, NULL, &ctx,
1452 NULL);
1453 if (ret)
1454 return ret;
1455 spin_lock(&glob->lru_lock);
1456 }
1457 }
1458 spin_unlock(&glob->lru_lock);
1459
1460 spin_lock(&man->move_lock);
1461 fence = dma_fence_get(man->move);
1462 spin_unlock(&man->move_lock);
1463
1464 if (fence) {
1465 ret = dma_fence_wait(fence, false);
1466 dma_fence_put(fence);
1467 if (ret)
1468 return ret;
1469 }
1470
1471 return 0;
1472}
1473
1474int ttm_bo_clean_mm(struct ttm_bo_device *bdev, unsigned mem_type)
1475{
1476 struct ttm_mem_type_manager *man;
1477 int ret = -EINVAL;
1478
1479 if (mem_type >= TTM_NUM_MEM_TYPES) {
1480 pr_err("Illegal memory type %d\n", mem_type);
1481 return ret;
1482 }
1483 man = &bdev->man[mem_type];
1484
1485 if (!man->has_type) {
1486 pr_err("Trying to take down uninitialized memory manager type %u\n",
1487 mem_type);
1488 return ret;
1489 }
1490
1491 man->use_type = false;
1492 man->has_type = false;
1493
1494 ret = 0;
1495 if (mem_type > 0) {
1496 ret = ttm_bo_force_list_clean(bdev, mem_type);
1497 if (ret) {
1498 pr_err("Cleanup eviction failed\n");
1499 return ret;
1500 }
1501
1502 ret = (*man->func->takedown)(man);
1503 }
1504
1505 dma_fence_put(man->move);
1506 man->move = NULL;
1507
1508 return ret;
1509}
1510EXPORT_SYMBOL(ttm_bo_clean_mm);
1511
1512int ttm_bo_evict_mm(struct ttm_bo_device *bdev, unsigned mem_type)
1513{
1514 struct ttm_mem_type_manager *man = &bdev->man[mem_type];
1515
1516 if (mem_type == 0 || mem_type >= TTM_NUM_MEM_TYPES) {
1517 pr_err("Illegal memory manager memory type %u\n", mem_type);
1518 return -EINVAL;
1519 }
1520
1521 if (!man->has_type) {
1522 pr_err("Memory type %u has not been initialized\n", mem_type);
1523 return 0;
1524 }
1525
1526 return ttm_bo_force_list_clean(bdev, mem_type);
1527}
1528EXPORT_SYMBOL(ttm_bo_evict_mm);
1529
1530int ttm_bo_init_mm(struct ttm_bo_device *bdev, unsigned type,
1531 unsigned long p_size)
1532{
1533 int ret;
1534 struct ttm_mem_type_manager *man;
1535 unsigned i;
1536
1537 BUG_ON(type >= TTM_NUM_MEM_TYPES);
1538 man = &bdev->man[type];
1539 BUG_ON(man->has_type);
1540 man->use_io_reserve_lru = false;
1541 mutex_init(&man->io_reserve_mutex);
1542 spin_lock_init(&man->move_lock);
1543 INIT_LIST_HEAD(&man->io_reserve_lru);
1544
1545 ret = bdev->driver->init_mem_type(bdev, type, man);
1546 if (ret)
1547 return ret;
1548 man->bdev = bdev;
1549
1550 if (type != TTM_PL_SYSTEM) {
1551 ret = (*man->func->init)(man, p_size);
1552 if (ret)
1553 return ret;
1554 }
1555 man->has_type = true;
1556 man->use_type = true;
1557 man->size = p_size;
1558
1559 for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i)
1560 INIT_LIST_HEAD(&man->lru[i]);
1561 man->move = NULL;
1562
1563 return 0;
1564}
1565EXPORT_SYMBOL(ttm_bo_init_mm);
1566
1567static void ttm_bo_global_kobj_release(struct kobject *kobj)
1568{
1569 struct ttm_bo_global *glob =
1570 container_of(kobj, struct ttm_bo_global, kobj);
1571
1572 __free_page(glob->dummy_read_page);
1573}
1574
1575static void ttm_bo_global_release(void)
1576{
1577 struct ttm_bo_global *glob = &ttm_bo_glob;
1578
1579 mutex_lock(&ttm_global_mutex);
1580 if (--ttm_bo_glob_use_count > 0)
1581 goto out;
1582
1583 kobject_del(&glob->kobj);
1584 kobject_put(&glob->kobj);
1585 ttm_mem_global_release(&ttm_mem_glob);
1586 memset(glob, 0, sizeof(*glob));
1587out:
1588 mutex_unlock(&ttm_global_mutex);
1589}
1590
1591static int ttm_bo_global_init(void)
1592{
1593 struct ttm_bo_global *glob = &ttm_bo_glob;
1594 int ret = 0;
1595 unsigned i;
1596
1597 mutex_lock(&ttm_global_mutex);
1598 if (++ttm_bo_glob_use_count > 1)
1599 goto out;
1600
1601 ret = ttm_mem_global_init(&ttm_mem_glob);
1602 if (ret)
1603 goto out;
1604
1605 spin_lock_init(&glob->lru_lock);
1606 glob->dummy_read_page = alloc_page(__GFP_ZERO | GFP_DMA32);
1607
1608 if (unlikely(glob->dummy_read_page == NULL)) {
1609 ret = -ENOMEM;
1610 goto out;
1611 }
1612
1613 for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i)
1614 INIT_LIST_HEAD(&glob->swap_lru[i]);
1615 INIT_LIST_HEAD(&glob->device_list);
1616 atomic_set(&glob->bo_count, 0);
1617
1618 ret = kobject_init_and_add(
1619 &glob->kobj, &ttm_bo_glob_kobj_type, ttm_get_kobj(), "buffer_objects");
1620 if (unlikely(ret != 0))
1621 kobject_put(&glob->kobj);
1622out:
1623 mutex_unlock(&ttm_global_mutex);
1624 return ret;
1625}
1626
1627int ttm_bo_device_release(struct ttm_bo_device *bdev)
1628{
1629 struct ttm_bo_global *glob = &ttm_bo_glob;
1630 int ret = 0;
1631 unsigned i = TTM_NUM_MEM_TYPES;
1632 struct ttm_mem_type_manager *man;
1633
1634 while (i--) {
1635 man = &bdev->man[i];
1636 if (man->has_type) {
1637 man->use_type = false;
1638 if ((i != TTM_PL_SYSTEM) && ttm_bo_clean_mm(bdev, i)) {
1639 ret = -EBUSY;
1640 pr_err("DRM memory manager type %d is not clean\n",
1641 i);
1642 }
1643 man->has_type = false;
1644 }
1645 }
1646
1647 mutex_lock(&ttm_global_mutex);
1648 list_del(&bdev->device_list);
1649 mutex_unlock(&ttm_global_mutex);
1650
1651 cancel_delayed_work_sync(&bdev->wq);
1652
1653 if (ttm_bo_delayed_delete(bdev, true))
1654 pr_debug("Delayed destroy list was clean\n");
1655
1656 spin_lock(&glob->lru_lock);
1657 for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i)
1658 if (list_empty(&bdev->man[0].lru[0]))
1659 pr_debug("Swap list %d was clean\n", i);
1660 spin_unlock(&glob->lru_lock);
1661
1662 if (!ret)
1663 ttm_bo_global_release();
1664
1665 return ret;
1666}
1667EXPORT_SYMBOL(ttm_bo_device_release);
1668
1669int ttm_bo_device_init(struct ttm_bo_device *bdev,
1670 struct ttm_bo_driver *driver,
1671 struct address_space *mapping,
1672 struct drm_vma_offset_manager *vma_manager,
1673 bool need_dma32)
1674{
1675 struct ttm_bo_global *glob = &ttm_bo_glob;
1676 int ret;
1677
1678 if (WARN_ON(vma_manager == NULL))
1679 return -EINVAL;
1680
1681 ret = ttm_bo_global_init();
1682 if (ret)
1683 return ret;
1684
1685 bdev->driver = driver;
1686
1687 memset(bdev->man, 0, sizeof(bdev->man));
1688
1689 /*
1690 * Initialize the system memory buffer type.
1691 * Other types need to be driver / IOCTL initialized.
1692 */
1693 ret = ttm_bo_init_mm(bdev, TTM_PL_SYSTEM, 0);
1694 if (unlikely(ret != 0))
1695 goto out_no_sys;
1696
1697 bdev->vma_manager = vma_manager;
1698 INIT_DELAYED_WORK(&bdev->wq, ttm_bo_delayed_workqueue);
1699 INIT_LIST_HEAD(&bdev->ddestroy);
1700 bdev->dev_mapping = mapping;
1701 bdev->need_dma32 = need_dma32;
1702 mutex_lock(&ttm_global_mutex);
1703 list_add_tail(&bdev->device_list, &glob->device_list);
1704 mutex_unlock(&ttm_global_mutex);
1705
1706 return 0;
1707out_no_sys:
1708 ttm_bo_global_release();
1709 return ret;
1710}
1711EXPORT_SYMBOL(ttm_bo_device_init);
1712
1713/*
1714 * buffer object vm functions.
1715 */
1716
1717void ttm_bo_unmap_virtual_locked(struct ttm_buffer_object *bo)
1718{
1719 struct ttm_bo_device *bdev = bo->bdev;
1720
1721 drm_vma_node_unmap(&bo->base.vma_node, bdev->dev_mapping);
1722 ttm_mem_io_free_vm(bo);
1723}
1724
1725void ttm_bo_unmap_virtual(struct ttm_buffer_object *bo)
1726{
1727 struct ttm_bo_device *bdev = bo->bdev;
1728 struct ttm_mem_type_manager *man = &bdev->man[bo->mem.mem_type];
1729
1730 ttm_mem_io_lock(man, false);
1731 ttm_bo_unmap_virtual_locked(bo);
1732 ttm_mem_io_unlock(man);
1733}
1734
1735
1736EXPORT_SYMBOL(ttm_bo_unmap_virtual);
1737
1738int ttm_bo_wait(struct ttm_buffer_object *bo,
1739 bool interruptible, bool no_wait)
1740{
1741 long timeout = 15 * HZ;
1742
1743 if (no_wait) {
1744 if (dma_resv_test_signaled_rcu(bo->base.resv, true))
1745 return 0;
1746 else
1747 return -EBUSY;
1748 }
1749
1750 timeout = dma_resv_wait_timeout_rcu(bo->base.resv, true,
1751 interruptible, timeout);
1752 if (timeout < 0)
1753 return timeout;
1754
1755 if (timeout == 0)
1756 return -EBUSY;
1757
1758 dma_resv_add_excl_fence(bo->base.resv, NULL);
1759 return 0;
1760}
1761EXPORT_SYMBOL(ttm_bo_wait);
1762
1763/**
1764 * A buffer object shrink method that tries to swap out the first
1765 * buffer object on the bo_global::swap_lru list.
1766 */
1767int ttm_bo_swapout(struct ttm_bo_global *glob, struct ttm_operation_ctx *ctx)
1768{
1769 struct ttm_buffer_object *bo;
1770 int ret = -EBUSY;
1771 bool locked;
1772 unsigned i;
1773
1774 spin_lock(&glob->lru_lock);
1775 for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i) {
1776 list_for_each_entry(bo, &glob->swap_lru[i], swap) {
1777 if (!ttm_bo_evict_swapout_allowable(bo, ctx, &locked,
1778 NULL))
1779 continue;
1780
1781 if (!ttm_bo_get_unless_zero(bo)) {
1782 if (locked)
1783 dma_resv_unlock(bo->base.resv);
1784 continue;
1785 }
1786
1787 ret = 0;
1788 break;
1789 }
1790 if (!ret)
1791 break;
1792 }
1793
1794 if (ret) {
1795 spin_unlock(&glob->lru_lock);
1796 return ret;
1797 }
1798
1799 if (bo->deleted) {
1800 ret = ttm_bo_cleanup_refs(bo, false, false, locked);
1801 ttm_bo_put(bo);
1802 return ret;
1803 }
1804
1805 ttm_bo_del_from_lru(bo);
1806 spin_unlock(&glob->lru_lock);
1807
1808 /**
1809 * Move to system cached
1810 */
1811
1812 if (bo->mem.mem_type != TTM_PL_SYSTEM ||
1813 bo->ttm->caching_state != tt_cached) {
1814 struct ttm_operation_ctx ctx = { false, false };
1815 struct ttm_mem_reg evict_mem;
1816
1817 evict_mem = bo->mem;
1818 evict_mem.mm_node = NULL;
1819 evict_mem.placement = TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED;
1820 evict_mem.mem_type = TTM_PL_SYSTEM;
1821
1822 ret = ttm_bo_handle_move_mem(bo, &evict_mem, true, &ctx);
1823 if (unlikely(ret != 0))
1824 goto out;
1825 }
1826
1827 /**
1828 * Make sure BO is idle.
1829 */
1830
1831 ret = ttm_bo_wait(bo, false, false);
1832 if (unlikely(ret != 0))
1833 goto out;
1834
1835 ttm_bo_unmap_virtual(bo);
1836
1837 /**
1838 * Swap out. Buffer will be swapped in again as soon as
1839 * anyone tries to access a ttm page.
1840 */
1841
1842 if (bo->bdev->driver->swap_notify)
1843 bo->bdev->driver->swap_notify(bo);
1844
1845 ret = ttm_tt_swapout(bo->ttm, bo->persistent_swap_storage);
1846out:
1847
1848 /**
1849 *
1850 * Unreserve without putting on LRU to avoid swapping out an
1851 * already swapped buffer.
1852 */
1853 if (locked)
1854 dma_resv_unlock(bo->base.resv);
1855 ttm_bo_put(bo);
1856 return ret;
1857}
1858EXPORT_SYMBOL(ttm_bo_swapout);
1859
1860void ttm_bo_swapout_all(void)
1861{
1862 struct ttm_operation_ctx ctx = {
1863 .interruptible = false,
1864 .no_wait_gpu = false
1865 };
1866
1867 while (ttm_bo_swapout(&ttm_bo_glob, &ctx) == 0);
1868}
1869EXPORT_SYMBOL(ttm_bo_swapout_all);