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1/**************************************************************************
2 *
3 * Copyright (c) 2006-2009 VMware, Inc., Palo Alto, CA., USA
4 * All Rights Reserved.
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a
7 * copy of this software and associated documentation files (the
8 * "Software"), to deal in the Software without restriction, including
9 * without limitation the rights to use, copy, modify, merge, publish,
10 * distribute, sub license, and/or sell copies of the Software, and to
11 * permit persons to whom the Software is furnished to do so, subject to
12 * the following conditions:
13 *
14 * The above copyright notice and this permission notice (including the
15 * next paragraph) shall be included in all copies or substantial portions
16 * of the Software.
17 *
18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
19 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
20 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
21 * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
22 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
23 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
24 * USE OR OTHER DEALINGS IN THE SOFTWARE.
25 *
26 **************************************************************************/
27/*
28 * Authors: Thomas Hellstrom <thellstrom-at-vmware-dot-com>
29 */
30
31#define pr_fmt(fmt) "[TTM] " fmt
32
33#include <drm/ttm/ttm_module.h>
34#include <drm/ttm/ttm_bo_driver.h>
35#include <drm/ttm/ttm_placement.h>
36#include <linux/jiffies.h>
37#include <linux/slab.h>
38#include <linux/sched.h>
39#include <linux/mm.h>
40#include <linux/file.h>
41#include <linux/module.h>
42#include <linux/atomic.h>
43#include <linux/reservation.h>
44
45#define TTM_ASSERT_LOCKED(param)
46#define TTM_DEBUG(fmt, arg...)
47#define TTM_BO_HASH_ORDER 13
48
49static int ttm_bo_swapout(struct ttm_mem_shrink *shrink);
50static void ttm_bo_global_kobj_release(struct kobject *kobj);
51
52static struct attribute ttm_bo_count = {
53 .name = "bo_count",
54 .mode = S_IRUGO
55};
56
57static inline int ttm_mem_type_from_place(const struct ttm_place *place,
58 uint32_t *mem_type)
59{
60 int i;
61
62 for (i = 0; i <= TTM_PL_PRIV5; i++)
63 if (place->flags & (1 << i)) {
64 *mem_type = i;
65 return 0;
66 }
67 return -EINVAL;
68}
69
70static void ttm_mem_type_debug(struct ttm_bo_device *bdev, int mem_type)
71{
72 struct ttm_mem_type_manager *man = &bdev->man[mem_type];
73
74 pr_err(" has_type: %d\n", man->has_type);
75 pr_err(" use_type: %d\n", man->use_type);
76 pr_err(" flags: 0x%08X\n", man->flags);
77 pr_err(" gpu_offset: 0x%08llX\n", man->gpu_offset);
78 pr_err(" size: %llu\n", man->size);
79 pr_err(" available_caching: 0x%08X\n", man->available_caching);
80 pr_err(" default_caching: 0x%08X\n", man->default_caching);
81 if (mem_type != TTM_PL_SYSTEM)
82 (*man->func->debug)(man, TTM_PFX);
83}
84
85static void ttm_bo_mem_space_debug(struct ttm_buffer_object *bo,
86 struct ttm_placement *placement)
87{
88 int i, ret, mem_type;
89
90 pr_err("No space for %p (%lu pages, %luK, %luM)\n",
91 bo, bo->mem.num_pages, bo->mem.size >> 10,
92 bo->mem.size >> 20);
93 for (i = 0; i < placement->num_placement; i++) {
94 ret = ttm_mem_type_from_place(&placement->placement[i],
95 &mem_type);
96 if (ret)
97 return;
98 pr_err(" placement[%d]=0x%08X (%d)\n",
99 i, placement->placement[i].flags, mem_type);
100 ttm_mem_type_debug(bo->bdev, mem_type);
101 }
102}
103
104static ssize_t ttm_bo_global_show(struct kobject *kobj,
105 struct attribute *attr,
106 char *buffer)
107{
108 struct ttm_bo_global *glob =
109 container_of(kobj, struct ttm_bo_global, kobj);
110
111 return snprintf(buffer, PAGE_SIZE, "%lu\n",
112 (unsigned long) atomic_read(&glob->bo_count));
113}
114
115static struct attribute *ttm_bo_global_attrs[] = {
116 &ttm_bo_count,
117 NULL
118};
119
120static const struct sysfs_ops ttm_bo_global_ops = {
121 .show = &ttm_bo_global_show
122};
123
124static struct kobj_type ttm_bo_glob_kobj_type = {
125 .release = &ttm_bo_global_kobj_release,
126 .sysfs_ops = &ttm_bo_global_ops,
127 .default_attrs = ttm_bo_global_attrs
128};
129
130
131static inline uint32_t ttm_bo_type_flags(unsigned type)
132{
133 return 1 << (type);
134}
135
136static void ttm_bo_release_list(struct kref *list_kref)
137{
138 struct ttm_buffer_object *bo =
139 container_of(list_kref, struct ttm_buffer_object, list_kref);
140 struct ttm_bo_device *bdev = bo->bdev;
141 size_t acc_size = bo->acc_size;
142
143 BUG_ON(atomic_read(&bo->list_kref.refcount));
144 BUG_ON(atomic_read(&bo->kref.refcount));
145 BUG_ON(atomic_read(&bo->cpu_writers));
146 BUG_ON(bo->mem.mm_node != NULL);
147 BUG_ON(!list_empty(&bo->lru));
148 BUG_ON(!list_empty(&bo->ddestroy));
149
150 if (bo->ttm)
151 ttm_tt_destroy(bo->ttm);
152 atomic_dec(&bo->glob->bo_count);
153 if (bo->resv == &bo->ttm_resv)
154 reservation_object_fini(&bo->ttm_resv);
155 mutex_destroy(&bo->wu_mutex);
156 if (bo->destroy)
157 bo->destroy(bo);
158 else {
159 kfree(bo);
160 }
161 ttm_mem_global_free(bdev->glob->mem_glob, acc_size);
162}
163
164void ttm_bo_add_to_lru(struct ttm_buffer_object *bo)
165{
166 struct ttm_bo_device *bdev = bo->bdev;
167 struct ttm_mem_type_manager *man;
168
169 lockdep_assert_held(&bo->resv->lock.base);
170
171 if (!(bo->mem.placement & TTM_PL_FLAG_NO_EVICT)) {
172
173 BUG_ON(!list_empty(&bo->lru));
174
175 man = &bdev->man[bo->mem.mem_type];
176 list_add_tail(&bo->lru, &man->lru);
177 kref_get(&bo->list_kref);
178
179 if (bo->ttm && !(bo->ttm->page_flags & TTM_PAGE_FLAG_SG)) {
180 list_add_tail(&bo->swap, &bo->glob->swap_lru);
181 kref_get(&bo->list_kref);
182 }
183 }
184}
185EXPORT_SYMBOL(ttm_bo_add_to_lru);
186
187int ttm_bo_del_from_lru(struct ttm_buffer_object *bo)
188{
189 int put_count = 0;
190
191 if (!list_empty(&bo->swap)) {
192 list_del_init(&bo->swap);
193 ++put_count;
194 }
195 if (!list_empty(&bo->lru)) {
196 list_del_init(&bo->lru);
197 ++put_count;
198 }
199
200 /*
201 * TODO: Add a driver hook to delete from
202 * driver-specific LRU's here.
203 */
204
205 return put_count;
206}
207
208static void ttm_bo_ref_bug(struct kref *list_kref)
209{
210 BUG();
211}
212
213void ttm_bo_list_ref_sub(struct ttm_buffer_object *bo, int count,
214 bool never_free)
215{
216 kref_sub(&bo->list_kref, count,
217 (never_free) ? ttm_bo_ref_bug : ttm_bo_release_list);
218}
219
220void ttm_bo_del_sub_from_lru(struct ttm_buffer_object *bo)
221{
222 int put_count;
223
224 spin_lock(&bo->glob->lru_lock);
225 put_count = ttm_bo_del_from_lru(bo);
226 spin_unlock(&bo->glob->lru_lock);
227 ttm_bo_list_ref_sub(bo, put_count, true);
228}
229EXPORT_SYMBOL(ttm_bo_del_sub_from_lru);
230
231void ttm_bo_move_to_lru_tail(struct ttm_buffer_object *bo)
232{
233 int put_count = 0;
234
235 lockdep_assert_held(&bo->resv->lock.base);
236
237 put_count = ttm_bo_del_from_lru(bo);
238 ttm_bo_list_ref_sub(bo, put_count, true);
239 ttm_bo_add_to_lru(bo);
240}
241EXPORT_SYMBOL(ttm_bo_move_to_lru_tail);
242
243/*
244 * Call bo->mutex locked.
245 */
246static int ttm_bo_add_ttm(struct ttm_buffer_object *bo, bool zero_alloc)
247{
248 struct ttm_bo_device *bdev = bo->bdev;
249 struct ttm_bo_global *glob = bo->glob;
250 int ret = 0;
251 uint32_t page_flags = 0;
252
253 TTM_ASSERT_LOCKED(&bo->mutex);
254 bo->ttm = NULL;
255
256 if (bdev->need_dma32)
257 page_flags |= TTM_PAGE_FLAG_DMA32;
258
259 switch (bo->type) {
260 case ttm_bo_type_device:
261 if (zero_alloc)
262 page_flags |= TTM_PAGE_FLAG_ZERO_ALLOC;
263 case ttm_bo_type_kernel:
264 bo->ttm = bdev->driver->ttm_tt_create(bdev, bo->num_pages << PAGE_SHIFT,
265 page_flags, glob->dummy_read_page);
266 if (unlikely(bo->ttm == NULL))
267 ret = -ENOMEM;
268 break;
269 case ttm_bo_type_sg:
270 bo->ttm = bdev->driver->ttm_tt_create(bdev, bo->num_pages << PAGE_SHIFT,
271 page_flags | TTM_PAGE_FLAG_SG,
272 glob->dummy_read_page);
273 if (unlikely(bo->ttm == NULL)) {
274 ret = -ENOMEM;
275 break;
276 }
277 bo->ttm->sg = bo->sg;
278 break;
279 default:
280 pr_err("Illegal buffer object type\n");
281 ret = -EINVAL;
282 break;
283 }
284
285 return ret;
286}
287
288static int ttm_bo_handle_move_mem(struct ttm_buffer_object *bo,
289 struct ttm_mem_reg *mem,
290 bool evict, bool interruptible,
291 bool no_wait_gpu)
292{
293 struct ttm_bo_device *bdev = bo->bdev;
294 bool old_is_pci = ttm_mem_reg_is_pci(bdev, &bo->mem);
295 bool new_is_pci = ttm_mem_reg_is_pci(bdev, mem);
296 struct ttm_mem_type_manager *old_man = &bdev->man[bo->mem.mem_type];
297 struct ttm_mem_type_manager *new_man = &bdev->man[mem->mem_type];
298 int ret = 0;
299
300 if (old_is_pci || new_is_pci ||
301 ((mem->placement & bo->mem.placement & TTM_PL_MASK_CACHING) == 0)) {
302 ret = ttm_mem_io_lock(old_man, true);
303 if (unlikely(ret != 0))
304 goto out_err;
305 ttm_bo_unmap_virtual_locked(bo);
306 ttm_mem_io_unlock(old_man);
307 }
308
309 /*
310 * Create and bind a ttm if required.
311 */
312
313 if (!(new_man->flags & TTM_MEMTYPE_FLAG_FIXED)) {
314 if (bo->ttm == NULL) {
315 bool zero = !(old_man->flags & TTM_MEMTYPE_FLAG_FIXED);
316 ret = ttm_bo_add_ttm(bo, zero);
317 if (ret)
318 goto out_err;
319 }
320
321 ret = ttm_tt_set_placement_caching(bo->ttm, mem->placement);
322 if (ret)
323 goto out_err;
324
325 if (mem->mem_type != TTM_PL_SYSTEM) {
326 ret = ttm_tt_bind(bo->ttm, mem);
327 if (ret)
328 goto out_err;
329 }
330
331 if (bo->mem.mem_type == TTM_PL_SYSTEM) {
332 if (bdev->driver->move_notify)
333 bdev->driver->move_notify(bo, mem);
334 bo->mem = *mem;
335 mem->mm_node = NULL;
336 goto moved;
337 }
338 }
339
340 if (bdev->driver->move_notify)
341 bdev->driver->move_notify(bo, mem);
342
343 if (!(old_man->flags & TTM_MEMTYPE_FLAG_FIXED) &&
344 !(new_man->flags & TTM_MEMTYPE_FLAG_FIXED))
345 ret = ttm_bo_move_ttm(bo, evict, no_wait_gpu, mem);
346 else if (bdev->driver->move)
347 ret = bdev->driver->move(bo, evict, interruptible,
348 no_wait_gpu, mem);
349 else
350 ret = ttm_bo_move_memcpy(bo, evict, no_wait_gpu, mem);
351
352 if (ret) {
353 if (bdev->driver->move_notify) {
354 struct ttm_mem_reg tmp_mem = *mem;
355 *mem = bo->mem;
356 bo->mem = tmp_mem;
357 bdev->driver->move_notify(bo, mem);
358 bo->mem = *mem;
359 *mem = tmp_mem;
360 }
361
362 goto out_err;
363 }
364
365moved:
366 if (bo->evicted) {
367 if (bdev->driver->invalidate_caches) {
368 ret = bdev->driver->invalidate_caches(bdev, bo->mem.placement);
369 if (ret)
370 pr_err("Can not flush read caches\n");
371 }
372 bo->evicted = false;
373 }
374
375 if (bo->mem.mm_node) {
376 bo->offset = (bo->mem.start << PAGE_SHIFT) +
377 bdev->man[bo->mem.mem_type].gpu_offset;
378 bo->cur_placement = bo->mem.placement;
379 } else
380 bo->offset = 0;
381
382 return 0;
383
384out_err:
385 new_man = &bdev->man[bo->mem.mem_type];
386 if ((new_man->flags & TTM_MEMTYPE_FLAG_FIXED) && bo->ttm) {
387 ttm_tt_unbind(bo->ttm);
388 ttm_tt_destroy(bo->ttm);
389 bo->ttm = NULL;
390 }
391
392 return ret;
393}
394
395/**
396 * Call bo::reserved.
397 * Will release GPU memory type usage on destruction.
398 * This is the place to put in driver specific hooks to release
399 * driver private resources.
400 * Will release the bo::reserved lock.
401 */
402
403static void ttm_bo_cleanup_memtype_use(struct ttm_buffer_object *bo)
404{
405 if (bo->bdev->driver->move_notify)
406 bo->bdev->driver->move_notify(bo, NULL);
407
408 if (bo->ttm) {
409 ttm_tt_unbind(bo->ttm);
410 ttm_tt_destroy(bo->ttm);
411 bo->ttm = NULL;
412 }
413 ttm_bo_mem_put(bo, &bo->mem);
414
415 ww_mutex_unlock (&bo->resv->lock);
416}
417
418static void ttm_bo_flush_all_fences(struct ttm_buffer_object *bo)
419{
420 struct reservation_object_list *fobj;
421 struct fence *fence;
422 int i;
423
424 fobj = reservation_object_get_list(bo->resv);
425 fence = reservation_object_get_excl(bo->resv);
426 if (fence && !fence->ops->signaled)
427 fence_enable_sw_signaling(fence);
428
429 for (i = 0; fobj && i < fobj->shared_count; ++i) {
430 fence = rcu_dereference_protected(fobj->shared[i],
431 reservation_object_held(bo->resv));
432
433 if (!fence->ops->signaled)
434 fence_enable_sw_signaling(fence);
435 }
436}
437
438static void ttm_bo_cleanup_refs_or_queue(struct ttm_buffer_object *bo)
439{
440 struct ttm_bo_device *bdev = bo->bdev;
441 struct ttm_bo_global *glob = bo->glob;
442 int put_count;
443 int ret;
444
445 spin_lock(&glob->lru_lock);
446 ret = __ttm_bo_reserve(bo, false, true, false, NULL);
447
448 if (!ret) {
449 if (!ttm_bo_wait(bo, false, false, true)) {
450 put_count = ttm_bo_del_from_lru(bo);
451
452 spin_unlock(&glob->lru_lock);
453 ttm_bo_cleanup_memtype_use(bo);
454
455 ttm_bo_list_ref_sub(bo, put_count, true);
456
457 return;
458 } else
459 ttm_bo_flush_all_fences(bo);
460
461 /*
462 * Make NO_EVICT bos immediately available to
463 * shrinkers, now that they are queued for
464 * destruction.
465 */
466 if (bo->mem.placement & TTM_PL_FLAG_NO_EVICT) {
467 bo->mem.placement &= ~TTM_PL_FLAG_NO_EVICT;
468 ttm_bo_add_to_lru(bo);
469 }
470
471 __ttm_bo_unreserve(bo);
472 }
473
474 kref_get(&bo->list_kref);
475 list_add_tail(&bo->ddestroy, &bdev->ddestroy);
476 spin_unlock(&glob->lru_lock);
477
478 schedule_delayed_work(&bdev->wq,
479 ((HZ / 100) < 1) ? 1 : HZ / 100);
480}
481
482/**
483 * function ttm_bo_cleanup_refs_and_unlock
484 * If bo idle, remove from delayed- and lru lists, and unref.
485 * If not idle, do nothing.
486 *
487 * Must be called with lru_lock and reservation held, this function
488 * will drop both before returning.
489 *
490 * @interruptible Any sleeps should occur interruptibly.
491 * @no_wait_gpu Never wait for gpu. Return -EBUSY instead.
492 */
493
494static int ttm_bo_cleanup_refs_and_unlock(struct ttm_buffer_object *bo,
495 bool interruptible,
496 bool no_wait_gpu)
497{
498 struct ttm_bo_global *glob = bo->glob;
499 int put_count;
500 int ret;
501
502 ret = ttm_bo_wait(bo, false, false, true);
503
504 if (ret && !no_wait_gpu) {
505 long lret;
506 ww_mutex_unlock(&bo->resv->lock);
507 spin_unlock(&glob->lru_lock);
508
509 lret = reservation_object_wait_timeout_rcu(bo->resv,
510 true,
511 interruptible,
512 30 * HZ);
513
514 if (lret < 0)
515 return lret;
516 else if (lret == 0)
517 return -EBUSY;
518
519 spin_lock(&glob->lru_lock);
520 ret = __ttm_bo_reserve(bo, false, true, false, NULL);
521
522 /*
523 * We raced, and lost, someone else holds the reservation now,
524 * and is probably busy in ttm_bo_cleanup_memtype_use.
525 *
526 * Even if it's not the case, because we finished waiting any
527 * delayed destruction would succeed, so just return success
528 * here.
529 */
530 if (ret) {
531 spin_unlock(&glob->lru_lock);
532 return 0;
533 }
534
535 /*
536 * remove sync_obj with ttm_bo_wait, the wait should be
537 * finished, and no new wait object should have been added.
538 */
539 ret = ttm_bo_wait(bo, false, false, true);
540 WARN_ON(ret);
541 }
542
543 if (ret || unlikely(list_empty(&bo->ddestroy))) {
544 __ttm_bo_unreserve(bo);
545 spin_unlock(&glob->lru_lock);
546 return ret;
547 }
548
549 put_count = ttm_bo_del_from_lru(bo);
550 list_del_init(&bo->ddestroy);
551 ++put_count;
552
553 spin_unlock(&glob->lru_lock);
554 ttm_bo_cleanup_memtype_use(bo);
555
556 ttm_bo_list_ref_sub(bo, put_count, true);
557
558 return 0;
559}
560
561/**
562 * Traverse the delayed list, and call ttm_bo_cleanup_refs on all
563 * encountered buffers.
564 */
565
566static int ttm_bo_delayed_delete(struct ttm_bo_device *bdev, bool remove_all)
567{
568 struct ttm_bo_global *glob = bdev->glob;
569 struct ttm_buffer_object *entry = NULL;
570 int ret = 0;
571
572 spin_lock(&glob->lru_lock);
573 if (list_empty(&bdev->ddestroy))
574 goto out_unlock;
575
576 entry = list_first_entry(&bdev->ddestroy,
577 struct ttm_buffer_object, ddestroy);
578 kref_get(&entry->list_kref);
579
580 for (;;) {
581 struct ttm_buffer_object *nentry = NULL;
582
583 if (entry->ddestroy.next != &bdev->ddestroy) {
584 nentry = list_first_entry(&entry->ddestroy,
585 struct ttm_buffer_object, ddestroy);
586 kref_get(&nentry->list_kref);
587 }
588
589 ret = __ttm_bo_reserve(entry, false, true, false, NULL);
590 if (remove_all && ret) {
591 spin_unlock(&glob->lru_lock);
592 ret = __ttm_bo_reserve(entry, false, false,
593 false, NULL);
594 spin_lock(&glob->lru_lock);
595 }
596
597 if (!ret)
598 ret = ttm_bo_cleanup_refs_and_unlock(entry, false,
599 !remove_all);
600 else
601 spin_unlock(&glob->lru_lock);
602
603 kref_put(&entry->list_kref, ttm_bo_release_list);
604 entry = nentry;
605
606 if (ret || !entry)
607 goto out;
608
609 spin_lock(&glob->lru_lock);
610 if (list_empty(&entry->ddestroy))
611 break;
612 }
613
614out_unlock:
615 spin_unlock(&glob->lru_lock);
616out:
617 if (entry)
618 kref_put(&entry->list_kref, ttm_bo_release_list);
619 return ret;
620}
621
622static void ttm_bo_delayed_workqueue(struct work_struct *work)
623{
624 struct ttm_bo_device *bdev =
625 container_of(work, struct ttm_bo_device, wq.work);
626
627 if (ttm_bo_delayed_delete(bdev, false)) {
628 schedule_delayed_work(&bdev->wq,
629 ((HZ / 100) < 1) ? 1 : HZ / 100);
630 }
631}
632
633static void ttm_bo_release(struct kref *kref)
634{
635 struct ttm_buffer_object *bo =
636 container_of(kref, struct ttm_buffer_object, kref);
637 struct ttm_bo_device *bdev = bo->bdev;
638 struct ttm_mem_type_manager *man = &bdev->man[bo->mem.mem_type];
639
640 drm_vma_offset_remove(&bdev->vma_manager, &bo->vma_node);
641 ttm_mem_io_lock(man, false);
642 ttm_mem_io_free_vm(bo);
643 ttm_mem_io_unlock(man);
644 ttm_bo_cleanup_refs_or_queue(bo);
645 kref_put(&bo->list_kref, ttm_bo_release_list);
646}
647
648void ttm_bo_unref(struct ttm_buffer_object **p_bo)
649{
650 struct ttm_buffer_object *bo = *p_bo;
651
652 *p_bo = NULL;
653 kref_put(&bo->kref, ttm_bo_release);
654}
655EXPORT_SYMBOL(ttm_bo_unref);
656
657int ttm_bo_lock_delayed_workqueue(struct ttm_bo_device *bdev)
658{
659 return cancel_delayed_work_sync(&bdev->wq);
660}
661EXPORT_SYMBOL(ttm_bo_lock_delayed_workqueue);
662
663void ttm_bo_unlock_delayed_workqueue(struct ttm_bo_device *bdev, int resched)
664{
665 if (resched)
666 schedule_delayed_work(&bdev->wq,
667 ((HZ / 100) < 1) ? 1 : HZ / 100);
668}
669EXPORT_SYMBOL(ttm_bo_unlock_delayed_workqueue);
670
671static int ttm_bo_evict(struct ttm_buffer_object *bo, bool interruptible,
672 bool no_wait_gpu)
673{
674 struct ttm_bo_device *bdev = bo->bdev;
675 struct ttm_mem_reg evict_mem;
676 struct ttm_placement placement;
677 int ret = 0;
678
679 ret = ttm_bo_wait(bo, false, interruptible, no_wait_gpu);
680
681 if (unlikely(ret != 0)) {
682 if (ret != -ERESTARTSYS) {
683 pr_err("Failed to expire sync object before buffer eviction\n");
684 }
685 goto out;
686 }
687
688 lockdep_assert_held(&bo->resv->lock.base);
689
690 evict_mem = bo->mem;
691 evict_mem.mm_node = NULL;
692 evict_mem.bus.io_reserved_vm = false;
693 evict_mem.bus.io_reserved_count = 0;
694
695 placement.num_placement = 0;
696 placement.num_busy_placement = 0;
697 bdev->driver->evict_flags(bo, &placement);
698 ret = ttm_bo_mem_space(bo, &placement, &evict_mem, interruptible,
699 no_wait_gpu);
700 if (ret) {
701 if (ret != -ERESTARTSYS) {
702 pr_err("Failed to find memory space for buffer 0x%p eviction\n",
703 bo);
704 ttm_bo_mem_space_debug(bo, &placement);
705 }
706 goto out;
707 }
708
709 ret = ttm_bo_handle_move_mem(bo, &evict_mem, true, interruptible,
710 no_wait_gpu);
711 if (ret) {
712 if (ret != -ERESTARTSYS)
713 pr_err("Buffer eviction failed\n");
714 ttm_bo_mem_put(bo, &evict_mem);
715 goto out;
716 }
717 bo->evicted = true;
718out:
719 return ret;
720}
721
722static int ttm_mem_evict_first(struct ttm_bo_device *bdev,
723 uint32_t mem_type,
724 const struct ttm_place *place,
725 bool interruptible,
726 bool no_wait_gpu)
727{
728 struct ttm_bo_global *glob = bdev->glob;
729 struct ttm_mem_type_manager *man = &bdev->man[mem_type];
730 struct ttm_buffer_object *bo;
731 int ret = -EBUSY, put_count;
732
733 spin_lock(&glob->lru_lock);
734 list_for_each_entry(bo, &man->lru, lru) {
735 ret = __ttm_bo_reserve(bo, false, true, false, NULL);
736 if (!ret) {
737 if (place && (place->fpfn || place->lpfn)) {
738 /* Don't evict this BO if it's outside of the
739 * requested placement range
740 */
741 if (place->fpfn >= (bo->mem.start + bo->mem.size) ||
742 (place->lpfn && place->lpfn <= bo->mem.start)) {
743 __ttm_bo_unreserve(bo);
744 ret = -EBUSY;
745 continue;
746 }
747 }
748
749 break;
750 }
751 }
752
753 if (ret) {
754 spin_unlock(&glob->lru_lock);
755 return ret;
756 }
757
758 kref_get(&bo->list_kref);
759
760 if (!list_empty(&bo->ddestroy)) {
761 ret = ttm_bo_cleanup_refs_and_unlock(bo, interruptible,
762 no_wait_gpu);
763 kref_put(&bo->list_kref, ttm_bo_release_list);
764 return ret;
765 }
766
767 put_count = ttm_bo_del_from_lru(bo);
768 spin_unlock(&glob->lru_lock);
769
770 BUG_ON(ret != 0);
771
772 ttm_bo_list_ref_sub(bo, put_count, true);
773
774 ret = ttm_bo_evict(bo, interruptible, no_wait_gpu);
775 ttm_bo_unreserve(bo);
776
777 kref_put(&bo->list_kref, ttm_bo_release_list);
778 return ret;
779}
780
781void ttm_bo_mem_put(struct ttm_buffer_object *bo, struct ttm_mem_reg *mem)
782{
783 struct ttm_mem_type_manager *man = &bo->bdev->man[mem->mem_type];
784
785 if (mem->mm_node)
786 (*man->func->put_node)(man, mem);
787}
788EXPORT_SYMBOL(ttm_bo_mem_put);
789
790/**
791 * Repeatedly evict memory from the LRU for @mem_type until we create enough
792 * space, or we've evicted everything and there isn't enough space.
793 */
794static int ttm_bo_mem_force_space(struct ttm_buffer_object *bo,
795 uint32_t mem_type,
796 const struct ttm_place *place,
797 struct ttm_mem_reg *mem,
798 bool interruptible,
799 bool no_wait_gpu)
800{
801 struct ttm_bo_device *bdev = bo->bdev;
802 struct ttm_mem_type_manager *man = &bdev->man[mem_type];
803 int ret;
804
805 do {
806 ret = (*man->func->get_node)(man, bo, place, mem);
807 if (unlikely(ret != 0))
808 return ret;
809 if (mem->mm_node)
810 break;
811 ret = ttm_mem_evict_first(bdev, mem_type, place,
812 interruptible, no_wait_gpu);
813 if (unlikely(ret != 0))
814 return ret;
815 } while (1);
816 if (mem->mm_node == NULL)
817 return -ENOMEM;
818 mem->mem_type = mem_type;
819 return 0;
820}
821
822static uint32_t ttm_bo_select_caching(struct ttm_mem_type_manager *man,
823 uint32_t cur_placement,
824 uint32_t proposed_placement)
825{
826 uint32_t caching = proposed_placement & TTM_PL_MASK_CACHING;
827 uint32_t result = proposed_placement & ~TTM_PL_MASK_CACHING;
828
829 /**
830 * Keep current caching if possible.
831 */
832
833 if ((cur_placement & caching) != 0)
834 result |= (cur_placement & caching);
835 else if ((man->default_caching & caching) != 0)
836 result |= man->default_caching;
837 else if ((TTM_PL_FLAG_CACHED & caching) != 0)
838 result |= TTM_PL_FLAG_CACHED;
839 else if ((TTM_PL_FLAG_WC & caching) != 0)
840 result |= TTM_PL_FLAG_WC;
841 else if ((TTM_PL_FLAG_UNCACHED & caching) != 0)
842 result |= TTM_PL_FLAG_UNCACHED;
843
844 return result;
845}
846
847static bool ttm_bo_mt_compatible(struct ttm_mem_type_manager *man,
848 uint32_t mem_type,
849 const struct ttm_place *place,
850 uint32_t *masked_placement)
851{
852 uint32_t cur_flags = ttm_bo_type_flags(mem_type);
853
854 if ((cur_flags & place->flags & TTM_PL_MASK_MEM) == 0)
855 return false;
856
857 if ((place->flags & man->available_caching) == 0)
858 return false;
859
860 cur_flags |= (place->flags & man->available_caching);
861
862 *masked_placement = cur_flags;
863 return true;
864}
865
866/**
867 * Creates space for memory region @mem according to its type.
868 *
869 * This function first searches for free space in compatible memory types in
870 * the priority order defined by the driver. If free space isn't found, then
871 * ttm_bo_mem_force_space is attempted in priority order to evict and find
872 * space.
873 */
874int ttm_bo_mem_space(struct ttm_buffer_object *bo,
875 struct ttm_placement *placement,
876 struct ttm_mem_reg *mem,
877 bool interruptible,
878 bool no_wait_gpu)
879{
880 struct ttm_bo_device *bdev = bo->bdev;
881 struct ttm_mem_type_manager *man;
882 uint32_t mem_type = TTM_PL_SYSTEM;
883 uint32_t cur_flags = 0;
884 bool type_found = false;
885 bool type_ok = false;
886 bool has_erestartsys = false;
887 int i, ret;
888
889 mem->mm_node = NULL;
890 for (i = 0; i < placement->num_placement; ++i) {
891 const struct ttm_place *place = &placement->placement[i];
892
893 ret = ttm_mem_type_from_place(place, &mem_type);
894 if (ret)
895 return ret;
896 man = &bdev->man[mem_type];
897 if (!man->has_type || !man->use_type)
898 continue;
899
900 type_ok = ttm_bo_mt_compatible(man, mem_type, place,
901 &cur_flags);
902
903 if (!type_ok)
904 continue;
905
906 type_found = true;
907 cur_flags = ttm_bo_select_caching(man, bo->mem.placement,
908 cur_flags);
909 /*
910 * Use the access and other non-mapping-related flag bits from
911 * the memory placement flags to the current flags
912 */
913 ttm_flag_masked(&cur_flags, place->flags,
914 ~TTM_PL_MASK_MEMTYPE);
915
916 if (mem_type == TTM_PL_SYSTEM)
917 break;
918
919 ret = (*man->func->get_node)(man, bo, place, mem);
920 if (unlikely(ret))
921 return ret;
922
923 if (mem->mm_node)
924 break;
925 }
926
927 if ((type_ok && (mem_type == TTM_PL_SYSTEM)) || mem->mm_node) {
928 mem->mem_type = mem_type;
929 mem->placement = cur_flags;
930 return 0;
931 }
932
933 for (i = 0; i < placement->num_busy_placement; ++i) {
934 const struct ttm_place *place = &placement->busy_placement[i];
935
936 ret = ttm_mem_type_from_place(place, &mem_type);
937 if (ret)
938 return ret;
939 man = &bdev->man[mem_type];
940 if (!man->has_type || !man->use_type)
941 continue;
942 if (!ttm_bo_mt_compatible(man, mem_type, place, &cur_flags))
943 continue;
944
945 type_found = true;
946 cur_flags = ttm_bo_select_caching(man, bo->mem.placement,
947 cur_flags);
948 /*
949 * Use the access and other non-mapping-related flag bits from
950 * the memory placement flags to the current flags
951 */
952 ttm_flag_masked(&cur_flags, place->flags,
953 ~TTM_PL_MASK_MEMTYPE);
954
955 if (mem_type == TTM_PL_SYSTEM) {
956 mem->mem_type = mem_type;
957 mem->placement = cur_flags;
958 mem->mm_node = NULL;
959 return 0;
960 }
961
962 ret = ttm_bo_mem_force_space(bo, mem_type, place, mem,
963 interruptible, no_wait_gpu);
964 if (ret == 0 && mem->mm_node) {
965 mem->placement = cur_flags;
966 return 0;
967 }
968 if (ret == -ERESTARTSYS)
969 has_erestartsys = true;
970 }
971
972 if (!type_found) {
973 printk(KERN_ERR TTM_PFX "No compatible memory type found.\n");
974 return -EINVAL;
975 }
976
977 return (has_erestartsys) ? -ERESTARTSYS : -ENOMEM;
978}
979EXPORT_SYMBOL(ttm_bo_mem_space);
980
981static int ttm_bo_move_buffer(struct ttm_buffer_object *bo,
982 struct ttm_placement *placement,
983 bool interruptible,
984 bool no_wait_gpu)
985{
986 int ret = 0;
987 struct ttm_mem_reg mem;
988
989 lockdep_assert_held(&bo->resv->lock.base);
990
991 /*
992 * FIXME: It's possible to pipeline buffer moves.
993 * Have the driver move function wait for idle when necessary,
994 * instead of doing it here.
995 */
996 ret = ttm_bo_wait(bo, false, interruptible, no_wait_gpu);
997 if (ret)
998 return ret;
999 mem.num_pages = bo->num_pages;
1000 mem.size = mem.num_pages << PAGE_SHIFT;
1001 mem.page_alignment = bo->mem.page_alignment;
1002 mem.bus.io_reserved_vm = false;
1003 mem.bus.io_reserved_count = 0;
1004 /*
1005 * Determine where to move the buffer.
1006 */
1007 ret = ttm_bo_mem_space(bo, placement, &mem,
1008 interruptible, no_wait_gpu);
1009 if (ret)
1010 goto out_unlock;
1011 ret = ttm_bo_handle_move_mem(bo, &mem, false,
1012 interruptible, no_wait_gpu);
1013out_unlock:
1014 if (ret && mem.mm_node)
1015 ttm_bo_mem_put(bo, &mem);
1016 return ret;
1017}
1018
1019static bool ttm_bo_mem_compat(struct ttm_placement *placement,
1020 struct ttm_mem_reg *mem,
1021 uint32_t *new_flags)
1022{
1023 int i;
1024
1025 for (i = 0; i < placement->num_placement; i++) {
1026 const struct ttm_place *heap = &placement->placement[i];
1027 if (mem->mm_node &&
1028 (mem->start < heap->fpfn ||
1029 (heap->lpfn != 0 && (mem->start + mem->num_pages) > heap->lpfn)))
1030 continue;
1031
1032 *new_flags = heap->flags;
1033 if ((*new_flags & mem->placement & TTM_PL_MASK_CACHING) &&
1034 (*new_flags & mem->placement & TTM_PL_MASK_MEM))
1035 return true;
1036 }
1037
1038 for (i = 0; i < placement->num_busy_placement; i++) {
1039 const struct ttm_place *heap = &placement->busy_placement[i];
1040 if (mem->mm_node &&
1041 (mem->start < heap->fpfn ||
1042 (heap->lpfn != 0 && (mem->start + mem->num_pages) > heap->lpfn)))
1043 continue;
1044
1045 *new_flags = heap->flags;
1046 if ((*new_flags & mem->placement & TTM_PL_MASK_CACHING) &&
1047 (*new_flags & mem->placement & TTM_PL_MASK_MEM))
1048 return true;
1049 }
1050
1051 return false;
1052}
1053
1054int ttm_bo_validate(struct ttm_buffer_object *bo,
1055 struct ttm_placement *placement,
1056 bool interruptible,
1057 bool no_wait_gpu)
1058{
1059 int ret;
1060 uint32_t new_flags;
1061
1062 lockdep_assert_held(&bo->resv->lock.base);
1063 /*
1064 * Check whether we need to move buffer.
1065 */
1066 if (!ttm_bo_mem_compat(placement, &bo->mem, &new_flags)) {
1067 ret = ttm_bo_move_buffer(bo, placement, interruptible,
1068 no_wait_gpu);
1069 if (ret)
1070 return ret;
1071 } else {
1072 /*
1073 * Use the access and other non-mapping-related flag bits from
1074 * the compatible memory placement flags to the active flags
1075 */
1076 ttm_flag_masked(&bo->mem.placement, new_flags,
1077 ~TTM_PL_MASK_MEMTYPE);
1078 }
1079 /*
1080 * We might need to add a TTM.
1081 */
1082 if (bo->mem.mem_type == TTM_PL_SYSTEM && bo->ttm == NULL) {
1083 ret = ttm_bo_add_ttm(bo, true);
1084 if (ret)
1085 return ret;
1086 }
1087 return 0;
1088}
1089EXPORT_SYMBOL(ttm_bo_validate);
1090
1091int ttm_bo_init(struct ttm_bo_device *bdev,
1092 struct ttm_buffer_object *bo,
1093 unsigned long size,
1094 enum ttm_bo_type type,
1095 struct ttm_placement *placement,
1096 uint32_t page_alignment,
1097 bool interruptible,
1098 struct file *persistent_swap_storage,
1099 size_t acc_size,
1100 struct sg_table *sg,
1101 struct reservation_object *resv,
1102 void (*destroy) (struct ttm_buffer_object *))
1103{
1104 int ret = 0;
1105 unsigned long num_pages;
1106 struct ttm_mem_global *mem_glob = bdev->glob->mem_glob;
1107 bool locked;
1108
1109 ret = ttm_mem_global_alloc(mem_glob, acc_size, false, false);
1110 if (ret) {
1111 pr_err("Out of kernel memory\n");
1112 if (destroy)
1113 (*destroy)(bo);
1114 else
1115 kfree(bo);
1116 return -ENOMEM;
1117 }
1118
1119 num_pages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
1120 if (num_pages == 0) {
1121 pr_err("Illegal buffer object size\n");
1122 if (destroy)
1123 (*destroy)(bo);
1124 else
1125 kfree(bo);
1126 ttm_mem_global_free(mem_glob, acc_size);
1127 return -EINVAL;
1128 }
1129 bo->destroy = destroy;
1130
1131 kref_init(&bo->kref);
1132 kref_init(&bo->list_kref);
1133 atomic_set(&bo->cpu_writers, 0);
1134 INIT_LIST_HEAD(&bo->lru);
1135 INIT_LIST_HEAD(&bo->ddestroy);
1136 INIT_LIST_HEAD(&bo->swap);
1137 INIT_LIST_HEAD(&bo->io_reserve_lru);
1138 mutex_init(&bo->wu_mutex);
1139 bo->bdev = bdev;
1140 bo->glob = bdev->glob;
1141 bo->type = type;
1142 bo->num_pages = num_pages;
1143 bo->mem.size = num_pages << PAGE_SHIFT;
1144 bo->mem.mem_type = TTM_PL_SYSTEM;
1145 bo->mem.num_pages = bo->num_pages;
1146 bo->mem.mm_node = NULL;
1147 bo->mem.page_alignment = page_alignment;
1148 bo->mem.bus.io_reserved_vm = false;
1149 bo->mem.bus.io_reserved_count = 0;
1150 bo->priv_flags = 0;
1151 bo->mem.placement = (TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED);
1152 bo->persistent_swap_storage = persistent_swap_storage;
1153 bo->acc_size = acc_size;
1154 bo->sg = sg;
1155 if (resv) {
1156 bo->resv = resv;
1157 lockdep_assert_held(&bo->resv->lock.base);
1158 } else {
1159 bo->resv = &bo->ttm_resv;
1160 reservation_object_init(&bo->ttm_resv);
1161 }
1162 atomic_inc(&bo->glob->bo_count);
1163 drm_vma_node_reset(&bo->vma_node);
1164
1165 /*
1166 * For ttm_bo_type_device buffers, allocate
1167 * address space from the device.
1168 */
1169 if (bo->type == ttm_bo_type_device ||
1170 bo->type == ttm_bo_type_sg)
1171 ret = drm_vma_offset_add(&bdev->vma_manager, &bo->vma_node,
1172 bo->mem.num_pages);
1173
1174 /* passed reservation objects should already be locked,
1175 * since otherwise lockdep will be angered in radeon.
1176 */
1177 if (!resv) {
1178 locked = ww_mutex_trylock(&bo->resv->lock);
1179 WARN_ON(!locked);
1180 }
1181
1182 if (likely(!ret))
1183 ret = ttm_bo_validate(bo, placement, interruptible, false);
1184
1185 if (!resv) {
1186 ttm_bo_unreserve(bo);
1187
1188 } else if (!(bo->mem.placement & TTM_PL_FLAG_NO_EVICT)) {
1189 spin_lock(&bo->glob->lru_lock);
1190 ttm_bo_add_to_lru(bo);
1191 spin_unlock(&bo->glob->lru_lock);
1192 }
1193
1194 if (unlikely(ret))
1195 ttm_bo_unref(&bo);
1196
1197 return ret;
1198}
1199EXPORT_SYMBOL(ttm_bo_init);
1200
1201size_t ttm_bo_acc_size(struct ttm_bo_device *bdev,
1202 unsigned long bo_size,
1203 unsigned struct_size)
1204{
1205 unsigned npages = (PAGE_ALIGN(bo_size)) >> PAGE_SHIFT;
1206 size_t size = 0;
1207
1208 size += ttm_round_pot(struct_size);
1209 size += PAGE_ALIGN(npages * sizeof(void *));
1210 size += ttm_round_pot(sizeof(struct ttm_tt));
1211 return size;
1212}
1213EXPORT_SYMBOL(ttm_bo_acc_size);
1214
1215size_t ttm_bo_dma_acc_size(struct ttm_bo_device *bdev,
1216 unsigned long bo_size,
1217 unsigned struct_size)
1218{
1219 unsigned npages = (PAGE_ALIGN(bo_size)) >> PAGE_SHIFT;
1220 size_t size = 0;
1221
1222 size += ttm_round_pot(struct_size);
1223 size += PAGE_ALIGN(npages * sizeof(void *));
1224 size += PAGE_ALIGN(npages * sizeof(dma_addr_t));
1225 size += ttm_round_pot(sizeof(struct ttm_dma_tt));
1226 return size;
1227}
1228EXPORT_SYMBOL(ttm_bo_dma_acc_size);
1229
1230int ttm_bo_create(struct ttm_bo_device *bdev,
1231 unsigned long size,
1232 enum ttm_bo_type type,
1233 struct ttm_placement *placement,
1234 uint32_t page_alignment,
1235 bool interruptible,
1236 struct file *persistent_swap_storage,
1237 struct ttm_buffer_object **p_bo)
1238{
1239 struct ttm_buffer_object *bo;
1240 size_t acc_size;
1241 int ret;
1242
1243 bo = kzalloc(sizeof(*bo), GFP_KERNEL);
1244 if (unlikely(bo == NULL))
1245 return -ENOMEM;
1246
1247 acc_size = ttm_bo_acc_size(bdev, size, sizeof(struct ttm_buffer_object));
1248 ret = ttm_bo_init(bdev, bo, size, type, placement, page_alignment,
1249 interruptible, persistent_swap_storage, acc_size,
1250 NULL, NULL, NULL);
1251 if (likely(ret == 0))
1252 *p_bo = bo;
1253
1254 return ret;
1255}
1256EXPORT_SYMBOL(ttm_bo_create);
1257
1258static int ttm_bo_force_list_clean(struct ttm_bo_device *bdev,
1259 unsigned mem_type, bool allow_errors)
1260{
1261 struct ttm_mem_type_manager *man = &bdev->man[mem_type];
1262 struct ttm_bo_global *glob = bdev->glob;
1263 int ret;
1264
1265 /*
1266 * Can't use standard list traversal since we're unlocking.
1267 */
1268
1269 spin_lock(&glob->lru_lock);
1270 while (!list_empty(&man->lru)) {
1271 spin_unlock(&glob->lru_lock);
1272 ret = ttm_mem_evict_first(bdev, mem_type, NULL, false, false);
1273 if (ret) {
1274 if (allow_errors) {
1275 return ret;
1276 } else {
1277 pr_err("Cleanup eviction failed\n");
1278 }
1279 }
1280 spin_lock(&glob->lru_lock);
1281 }
1282 spin_unlock(&glob->lru_lock);
1283 return 0;
1284}
1285
1286int ttm_bo_clean_mm(struct ttm_bo_device *bdev, unsigned mem_type)
1287{
1288 struct ttm_mem_type_manager *man;
1289 int ret = -EINVAL;
1290
1291 if (mem_type >= TTM_NUM_MEM_TYPES) {
1292 pr_err("Illegal memory type %d\n", mem_type);
1293 return ret;
1294 }
1295 man = &bdev->man[mem_type];
1296
1297 if (!man->has_type) {
1298 pr_err("Trying to take down uninitialized memory manager type %u\n",
1299 mem_type);
1300 return ret;
1301 }
1302
1303 man->use_type = false;
1304 man->has_type = false;
1305
1306 ret = 0;
1307 if (mem_type > 0) {
1308 ttm_bo_force_list_clean(bdev, mem_type, false);
1309
1310 ret = (*man->func->takedown)(man);
1311 }
1312
1313 return ret;
1314}
1315EXPORT_SYMBOL(ttm_bo_clean_mm);
1316
1317int ttm_bo_evict_mm(struct ttm_bo_device *bdev, unsigned mem_type)
1318{
1319 struct ttm_mem_type_manager *man = &bdev->man[mem_type];
1320
1321 if (mem_type == 0 || mem_type >= TTM_NUM_MEM_TYPES) {
1322 pr_err("Illegal memory manager memory type %u\n", mem_type);
1323 return -EINVAL;
1324 }
1325
1326 if (!man->has_type) {
1327 pr_err("Memory type %u has not been initialized\n", mem_type);
1328 return 0;
1329 }
1330
1331 return ttm_bo_force_list_clean(bdev, mem_type, true);
1332}
1333EXPORT_SYMBOL(ttm_bo_evict_mm);
1334
1335int ttm_bo_init_mm(struct ttm_bo_device *bdev, unsigned type,
1336 unsigned long p_size)
1337{
1338 int ret = -EINVAL;
1339 struct ttm_mem_type_manager *man;
1340
1341 BUG_ON(type >= TTM_NUM_MEM_TYPES);
1342 man = &bdev->man[type];
1343 BUG_ON(man->has_type);
1344 man->io_reserve_fastpath = true;
1345 man->use_io_reserve_lru = false;
1346 mutex_init(&man->io_reserve_mutex);
1347 INIT_LIST_HEAD(&man->io_reserve_lru);
1348
1349 ret = bdev->driver->init_mem_type(bdev, type, man);
1350 if (ret)
1351 return ret;
1352 man->bdev = bdev;
1353
1354 ret = 0;
1355 if (type != TTM_PL_SYSTEM) {
1356 ret = (*man->func->init)(man, p_size);
1357 if (ret)
1358 return ret;
1359 }
1360 man->has_type = true;
1361 man->use_type = true;
1362 man->size = p_size;
1363
1364 INIT_LIST_HEAD(&man->lru);
1365
1366 return 0;
1367}
1368EXPORT_SYMBOL(ttm_bo_init_mm);
1369
1370static void ttm_bo_global_kobj_release(struct kobject *kobj)
1371{
1372 struct ttm_bo_global *glob =
1373 container_of(kobj, struct ttm_bo_global, kobj);
1374
1375 ttm_mem_unregister_shrink(glob->mem_glob, &glob->shrink);
1376 __free_page(glob->dummy_read_page);
1377 kfree(glob);
1378}
1379
1380void ttm_bo_global_release(struct drm_global_reference *ref)
1381{
1382 struct ttm_bo_global *glob = ref->object;
1383
1384 kobject_del(&glob->kobj);
1385 kobject_put(&glob->kobj);
1386}
1387EXPORT_SYMBOL(ttm_bo_global_release);
1388
1389int ttm_bo_global_init(struct drm_global_reference *ref)
1390{
1391 struct ttm_bo_global_ref *bo_ref =
1392 container_of(ref, struct ttm_bo_global_ref, ref);
1393 struct ttm_bo_global *glob = ref->object;
1394 int ret;
1395
1396 mutex_init(&glob->device_list_mutex);
1397 spin_lock_init(&glob->lru_lock);
1398 glob->mem_glob = bo_ref->mem_glob;
1399 glob->dummy_read_page = alloc_page(__GFP_ZERO | GFP_DMA32);
1400
1401 if (unlikely(glob->dummy_read_page == NULL)) {
1402 ret = -ENOMEM;
1403 goto out_no_drp;
1404 }
1405
1406 INIT_LIST_HEAD(&glob->swap_lru);
1407 INIT_LIST_HEAD(&glob->device_list);
1408
1409 ttm_mem_init_shrink(&glob->shrink, ttm_bo_swapout);
1410 ret = ttm_mem_register_shrink(glob->mem_glob, &glob->shrink);
1411 if (unlikely(ret != 0)) {
1412 pr_err("Could not register buffer object swapout\n");
1413 goto out_no_shrink;
1414 }
1415
1416 atomic_set(&glob->bo_count, 0);
1417
1418 ret = kobject_init_and_add(
1419 &glob->kobj, &ttm_bo_glob_kobj_type, ttm_get_kobj(), "buffer_objects");
1420 if (unlikely(ret != 0))
1421 kobject_put(&glob->kobj);
1422 return ret;
1423out_no_shrink:
1424 __free_page(glob->dummy_read_page);
1425out_no_drp:
1426 kfree(glob);
1427 return ret;
1428}
1429EXPORT_SYMBOL(ttm_bo_global_init);
1430
1431
1432int ttm_bo_device_release(struct ttm_bo_device *bdev)
1433{
1434 int ret = 0;
1435 unsigned i = TTM_NUM_MEM_TYPES;
1436 struct ttm_mem_type_manager *man;
1437 struct ttm_bo_global *glob = bdev->glob;
1438
1439 while (i--) {
1440 man = &bdev->man[i];
1441 if (man->has_type) {
1442 man->use_type = false;
1443 if ((i != TTM_PL_SYSTEM) && ttm_bo_clean_mm(bdev, i)) {
1444 ret = -EBUSY;
1445 pr_err("DRM memory manager type %d is not clean\n",
1446 i);
1447 }
1448 man->has_type = false;
1449 }
1450 }
1451
1452 mutex_lock(&glob->device_list_mutex);
1453 list_del(&bdev->device_list);
1454 mutex_unlock(&glob->device_list_mutex);
1455
1456 cancel_delayed_work_sync(&bdev->wq);
1457
1458 while (ttm_bo_delayed_delete(bdev, true))
1459 ;
1460
1461 spin_lock(&glob->lru_lock);
1462 if (list_empty(&bdev->ddestroy))
1463 TTM_DEBUG("Delayed destroy list was clean\n");
1464
1465 if (list_empty(&bdev->man[0].lru))
1466 TTM_DEBUG("Swap list was clean\n");
1467 spin_unlock(&glob->lru_lock);
1468
1469 drm_vma_offset_manager_destroy(&bdev->vma_manager);
1470
1471 return ret;
1472}
1473EXPORT_SYMBOL(ttm_bo_device_release);
1474
1475int ttm_bo_device_init(struct ttm_bo_device *bdev,
1476 struct ttm_bo_global *glob,
1477 struct ttm_bo_driver *driver,
1478 struct address_space *mapping,
1479 uint64_t file_page_offset,
1480 bool need_dma32)
1481{
1482 int ret = -EINVAL;
1483
1484 bdev->driver = driver;
1485
1486 memset(bdev->man, 0, sizeof(bdev->man));
1487
1488 /*
1489 * Initialize the system memory buffer type.
1490 * Other types need to be driver / IOCTL initialized.
1491 */
1492 ret = ttm_bo_init_mm(bdev, TTM_PL_SYSTEM, 0);
1493 if (unlikely(ret != 0))
1494 goto out_no_sys;
1495
1496 drm_vma_offset_manager_init(&bdev->vma_manager, file_page_offset,
1497 0x10000000);
1498 INIT_DELAYED_WORK(&bdev->wq, ttm_bo_delayed_workqueue);
1499 INIT_LIST_HEAD(&bdev->ddestroy);
1500 bdev->dev_mapping = mapping;
1501 bdev->glob = glob;
1502 bdev->need_dma32 = need_dma32;
1503 bdev->val_seq = 0;
1504 mutex_lock(&glob->device_list_mutex);
1505 list_add_tail(&bdev->device_list, &glob->device_list);
1506 mutex_unlock(&glob->device_list_mutex);
1507
1508 return 0;
1509out_no_sys:
1510 return ret;
1511}
1512EXPORT_SYMBOL(ttm_bo_device_init);
1513
1514/*
1515 * buffer object vm functions.
1516 */
1517
1518bool ttm_mem_reg_is_pci(struct ttm_bo_device *bdev, struct ttm_mem_reg *mem)
1519{
1520 struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
1521
1522 if (!(man->flags & TTM_MEMTYPE_FLAG_FIXED)) {
1523 if (mem->mem_type == TTM_PL_SYSTEM)
1524 return false;
1525
1526 if (man->flags & TTM_MEMTYPE_FLAG_CMA)
1527 return false;
1528
1529 if (mem->placement & TTM_PL_FLAG_CACHED)
1530 return false;
1531 }
1532 return true;
1533}
1534
1535void ttm_bo_unmap_virtual_locked(struct ttm_buffer_object *bo)
1536{
1537 struct ttm_bo_device *bdev = bo->bdev;
1538
1539 drm_vma_node_unmap(&bo->vma_node, bdev->dev_mapping);
1540 ttm_mem_io_free_vm(bo);
1541}
1542
1543void ttm_bo_unmap_virtual(struct ttm_buffer_object *bo)
1544{
1545 struct ttm_bo_device *bdev = bo->bdev;
1546 struct ttm_mem_type_manager *man = &bdev->man[bo->mem.mem_type];
1547
1548 ttm_mem_io_lock(man, false);
1549 ttm_bo_unmap_virtual_locked(bo);
1550 ttm_mem_io_unlock(man);
1551}
1552
1553
1554EXPORT_SYMBOL(ttm_bo_unmap_virtual);
1555
1556int ttm_bo_wait(struct ttm_buffer_object *bo,
1557 bool lazy, bool interruptible, bool no_wait)
1558{
1559 struct reservation_object_list *fobj;
1560 struct reservation_object *resv;
1561 struct fence *excl;
1562 long timeout = 15 * HZ;
1563 int i;
1564
1565 resv = bo->resv;
1566 fobj = reservation_object_get_list(resv);
1567 excl = reservation_object_get_excl(resv);
1568 if (excl) {
1569 if (!fence_is_signaled(excl)) {
1570 if (no_wait)
1571 return -EBUSY;
1572
1573 timeout = fence_wait_timeout(excl,
1574 interruptible, timeout);
1575 }
1576 }
1577
1578 for (i = 0; fobj && timeout > 0 && i < fobj->shared_count; ++i) {
1579 struct fence *fence;
1580 fence = rcu_dereference_protected(fobj->shared[i],
1581 reservation_object_held(resv));
1582
1583 if (!fence_is_signaled(fence)) {
1584 if (no_wait)
1585 return -EBUSY;
1586
1587 timeout = fence_wait_timeout(fence,
1588 interruptible, timeout);
1589 }
1590 }
1591
1592 if (timeout < 0)
1593 return timeout;
1594
1595 if (timeout == 0)
1596 return -EBUSY;
1597
1598 reservation_object_add_excl_fence(resv, NULL);
1599 clear_bit(TTM_BO_PRIV_FLAG_MOVING, &bo->priv_flags);
1600 return 0;
1601}
1602EXPORT_SYMBOL(ttm_bo_wait);
1603
1604int ttm_bo_synccpu_write_grab(struct ttm_buffer_object *bo, bool no_wait)
1605{
1606 int ret = 0;
1607
1608 /*
1609 * Using ttm_bo_reserve makes sure the lru lists are updated.
1610 */
1611
1612 ret = ttm_bo_reserve(bo, true, no_wait, false, NULL);
1613 if (unlikely(ret != 0))
1614 return ret;
1615 ret = ttm_bo_wait(bo, false, true, no_wait);
1616 if (likely(ret == 0))
1617 atomic_inc(&bo->cpu_writers);
1618 ttm_bo_unreserve(bo);
1619 return ret;
1620}
1621EXPORT_SYMBOL(ttm_bo_synccpu_write_grab);
1622
1623void ttm_bo_synccpu_write_release(struct ttm_buffer_object *bo)
1624{
1625 atomic_dec(&bo->cpu_writers);
1626}
1627EXPORT_SYMBOL(ttm_bo_synccpu_write_release);
1628
1629/**
1630 * A buffer object shrink method that tries to swap out the first
1631 * buffer object on the bo_global::swap_lru list.
1632 */
1633
1634static int ttm_bo_swapout(struct ttm_mem_shrink *shrink)
1635{
1636 struct ttm_bo_global *glob =
1637 container_of(shrink, struct ttm_bo_global, shrink);
1638 struct ttm_buffer_object *bo;
1639 int ret = -EBUSY;
1640 int put_count;
1641 uint32_t swap_placement = (TTM_PL_FLAG_CACHED | TTM_PL_FLAG_SYSTEM);
1642
1643 spin_lock(&glob->lru_lock);
1644 list_for_each_entry(bo, &glob->swap_lru, swap) {
1645 ret = __ttm_bo_reserve(bo, false, true, false, NULL);
1646 if (!ret)
1647 break;
1648 }
1649
1650 if (ret) {
1651 spin_unlock(&glob->lru_lock);
1652 return ret;
1653 }
1654
1655 kref_get(&bo->list_kref);
1656
1657 if (!list_empty(&bo->ddestroy)) {
1658 ret = ttm_bo_cleanup_refs_and_unlock(bo, false, false);
1659 kref_put(&bo->list_kref, ttm_bo_release_list);
1660 return ret;
1661 }
1662
1663 put_count = ttm_bo_del_from_lru(bo);
1664 spin_unlock(&glob->lru_lock);
1665
1666 ttm_bo_list_ref_sub(bo, put_count, true);
1667
1668 /**
1669 * Wait for GPU, then move to system cached.
1670 */
1671
1672 ret = ttm_bo_wait(bo, false, false, false);
1673
1674 if (unlikely(ret != 0))
1675 goto out;
1676
1677 if ((bo->mem.placement & swap_placement) != swap_placement) {
1678 struct ttm_mem_reg evict_mem;
1679
1680 evict_mem = bo->mem;
1681 evict_mem.mm_node = NULL;
1682 evict_mem.placement = TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED;
1683 evict_mem.mem_type = TTM_PL_SYSTEM;
1684
1685 ret = ttm_bo_handle_move_mem(bo, &evict_mem, true,
1686 false, false);
1687 if (unlikely(ret != 0))
1688 goto out;
1689 }
1690
1691 ttm_bo_unmap_virtual(bo);
1692
1693 /**
1694 * Swap out. Buffer will be swapped in again as soon as
1695 * anyone tries to access a ttm page.
1696 */
1697
1698 if (bo->bdev->driver->swap_notify)
1699 bo->bdev->driver->swap_notify(bo);
1700
1701 ret = ttm_tt_swapout(bo->ttm, bo->persistent_swap_storage);
1702out:
1703
1704 /**
1705 *
1706 * Unreserve without putting on LRU to avoid swapping out an
1707 * already swapped buffer.
1708 */
1709
1710 __ttm_bo_unreserve(bo);
1711 kref_put(&bo->list_kref, ttm_bo_release_list);
1712 return ret;
1713}
1714
1715void ttm_bo_swapout_all(struct ttm_bo_device *bdev)
1716{
1717 while (ttm_bo_swapout(&bdev->glob->shrink) == 0)
1718 ;
1719}
1720EXPORT_SYMBOL(ttm_bo_swapout_all);
1721
1722/**
1723 * ttm_bo_wait_unreserved - interruptible wait for a buffer object to become
1724 * unreserved
1725 *
1726 * @bo: Pointer to buffer
1727 */
1728int ttm_bo_wait_unreserved(struct ttm_buffer_object *bo)
1729{
1730 int ret;
1731
1732 /*
1733 * In the absense of a wait_unlocked API,
1734 * Use the bo::wu_mutex to avoid triggering livelocks due to
1735 * concurrent use of this function. Note that this use of
1736 * bo::wu_mutex can go away if we change locking order to
1737 * mmap_sem -> bo::reserve.
1738 */
1739 ret = mutex_lock_interruptible(&bo->wu_mutex);
1740 if (unlikely(ret != 0))
1741 return -ERESTARTSYS;
1742 if (!ww_mutex_is_locked(&bo->resv->lock))
1743 goto out_unlock;
1744 ret = __ttm_bo_reserve(bo, true, false, false, NULL);
1745 if (unlikely(ret != 0))
1746 goto out_unlock;
1747 __ttm_bo_unreserve(bo);
1748
1749out_unlock:
1750 mutex_unlock(&bo->wu_mutex);
1751 return ret;
1752}
1/**************************************************************************
2 *
3 * Copyright (c) 2006-2009 VMware, Inc., Palo Alto, CA., USA
4 * All Rights Reserved.
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a
7 * copy of this software and associated documentation files (the
8 * "Software"), to deal in the Software without restriction, including
9 * without limitation the rights to use, copy, modify, merge, publish,
10 * distribute, sub license, and/or sell copies of the Software, and to
11 * permit persons to whom the Software is furnished to do so, subject to
12 * the following conditions:
13 *
14 * The above copyright notice and this permission notice (including the
15 * next paragraph) shall be included in all copies or substantial portions
16 * of the Software.
17 *
18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
19 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
20 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
21 * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
22 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
23 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
24 * USE OR OTHER DEALINGS IN THE SOFTWARE.
25 *
26 **************************************************************************/
27/*
28 * Authors: Thomas Hellstrom <thellstrom-at-vmware-dot-com>
29 */
30
31#define pr_fmt(fmt) "[TTM] " fmt
32
33#include "ttm/ttm_module.h"
34#include "ttm/ttm_bo_driver.h"
35#include "ttm/ttm_placement.h"
36#include <linux/jiffies.h>
37#include <linux/slab.h>
38#include <linux/sched.h>
39#include <linux/mm.h>
40#include <linux/file.h>
41#include <linux/module.h>
42#include <linux/atomic.h>
43
44#define TTM_ASSERT_LOCKED(param)
45#define TTM_DEBUG(fmt, arg...)
46#define TTM_BO_HASH_ORDER 13
47
48static int ttm_bo_setup_vm(struct ttm_buffer_object *bo);
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_flags(uint32_t flags, uint32_t *mem_type)
58{
59 int i;
60
61 for (i = 0; i <= TTM_PL_PRIV5; i++)
62 if (flags & (1 << i)) {
63 *mem_type = i;
64 return 0;
65 }
66 return -EINVAL;
67}
68
69static void ttm_mem_type_debug(struct ttm_bo_device *bdev, int mem_type)
70{
71 struct ttm_mem_type_manager *man = &bdev->man[mem_type];
72
73 pr_err(" has_type: %d\n", man->has_type);
74 pr_err(" use_type: %d\n", man->use_type);
75 pr_err(" flags: 0x%08X\n", man->flags);
76 pr_err(" gpu_offset: 0x%08lX\n", man->gpu_offset);
77 pr_err(" size: %llu\n", man->size);
78 pr_err(" available_caching: 0x%08X\n", man->available_caching);
79 pr_err(" default_caching: 0x%08X\n", man->default_caching);
80 if (mem_type != TTM_PL_SYSTEM)
81 (*man->func->debug)(man, TTM_PFX);
82}
83
84static void ttm_bo_mem_space_debug(struct ttm_buffer_object *bo,
85 struct ttm_placement *placement)
86{
87 int i, ret, mem_type;
88
89 pr_err("No space for %p (%lu pages, %luK, %luM)\n",
90 bo, bo->mem.num_pages, bo->mem.size >> 10,
91 bo->mem.size >> 20);
92 for (i = 0; i < placement->num_placement; i++) {
93 ret = ttm_mem_type_from_flags(placement->placement[i],
94 &mem_type);
95 if (ret)
96 return;
97 pr_err(" placement[%d]=0x%08X (%d)\n",
98 i, placement->placement[i], mem_type);
99 ttm_mem_type_debug(bo->bdev, mem_type);
100 }
101}
102
103static ssize_t ttm_bo_global_show(struct kobject *kobj,
104 struct attribute *attr,
105 char *buffer)
106{
107 struct ttm_bo_global *glob =
108 container_of(kobj, struct ttm_bo_global, kobj);
109
110 return snprintf(buffer, PAGE_SIZE, "%lu\n",
111 (unsigned long) atomic_read(&glob->bo_count));
112}
113
114static struct attribute *ttm_bo_global_attrs[] = {
115 &ttm_bo_count,
116 NULL
117};
118
119static const struct sysfs_ops ttm_bo_global_ops = {
120 .show = &ttm_bo_global_show
121};
122
123static struct kobj_type ttm_bo_glob_kobj_type = {
124 .release = &ttm_bo_global_kobj_release,
125 .sysfs_ops = &ttm_bo_global_ops,
126 .default_attrs = ttm_bo_global_attrs
127};
128
129
130static inline uint32_t ttm_bo_type_flags(unsigned type)
131{
132 return 1 << (type);
133}
134
135static void ttm_bo_release_list(struct kref *list_kref)
136{
137 struct ttm_buffer_object *bo =
138 container_of(list_kref, struct ttm_buffer_object, list_kref);
139 struct ttm_bo_device *bdev = bo->bdev;
140 size_t acc_size = bo->acc_size;
141
142 BUG_ON(atomic_read(&bo->list_kref.refcount));
143 BUG_ON(atomic_read(&bo->kref.refcount));
144 BUG_ON(atomic_read(&bo->cpu_writers));
145 BUG_ON(bo->sync_obj != NULL);
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->destroy)
154 bo->destroy(bo);
155 else {
156 kfree(bo);
157 }
158 ttm_mem_global_free(bdev->glob->mem_glob, acc_size);
159}
160
161int ttm_bo_wait_unreserved(struct ttm_buffer_object *bo, bool interruptible)
162{
163 if (interruptible) {
164 return wait_event_interruptible(bo->event_queue,
165 atomic_read(&bo->reserved) == 0);
166 } else {
167 wait_event(bo->event_queue, atomic_read(&bo->reserved) == 0);
168 return 0;
169 }
170}
171EXPORT_SYMBOL(ttm_bo_wait_unreserved);
172
173void ttm_bo_add_to_lru(struct ttm_buffer_object *bo)
174{
175 struct ttm_bo_device *bdev = bo->bdev;
176 struct ttm_mem_type_manager *man;
177
178 BUG_ON(!atomic_read(&bo->reserved));
179
180 if (!(bo->mem.placement & TTM_PL_FLAG_NO_EVICT)) {
181
182 BUG_ON(!list_empty(&bo->lru));
183
184 man = &bdev->man[bo->mem.mem_type];
185 list_add_tail(&bo->lru, &man->lru);
186 kref_get(&bo->list_kref);
187
188 if (bo->ttm != NULL) {
189 list_add_tail(&bo->swap, &bo->glob->swap_lru);
190 kref_get(&bo->list_kref);
191 }
192 }
193}
194
195int ttm_bo_del_from_lru(struct ttm_buffer_object *bo)
196{
197 int put_count = 0;
198
199 if (!list_empty(&bo->swap)) {
200 list_del_init(&bo->swap);
201 ++put_count;
202 }
203 if (!list_empty(&bo->lru)) {
204 list_del_init(&bo->lru);
205 ++put_count;
206 }
207
208 /*
209 * TODO: Add a driver hook to delete from
210 * driver-specific LRU's here.
211 */
212
213 return put_count;
214}
215
216int ttm_bo_reserve_locked(struct ttm_buffer_object *bo,
217 bool interruptible,
218 bool no_wait, bool use_sequence, uint32_t sequence)
219{
220 struct ttm_bo_global *glob = bo->glob;
221 int ret;
222
223 while (unlikely(atomic_cmpxchg(&bo->reserved, 0, 1) != 0)) {
224 /**
225 * Deadlock avoidance for multi-bo reserving.
226 */
227 if (use_sequence && bo->seq_valid) {
228 /**
229 * We've already reserved this one.
230 */
231 if (unlikely(sequence == bo->val_seq))
232 return -EDEADLK;
233 /**
234 * Already reserved by a thread that will not back
235 * off for us. We need to back off.
236 */
237 if (unlikely(sequence - bo->val_seq < (1 << 31)))
238 return -EAGAIN;
239 }
240
241 if (no_wait)
242 return -EBUSY;
243
244 spin_unlock(&glob->lru_lock);
245 ret = ttm_bo_wait_unreserved(bo, interruptible);
246 spin_lock(&glob->lru_lock);
247
248 if (unlikely(ret))
249 return ret;
250 }
251
252 if (use_sequence) {
253 /**
254 * Wake up waiters that may need to recheck for deadlock,
255 * if we decreased the sequence number.
256 */
257 if (unlikely((bo->val_seq - sequence < (1 << 31))
258 || !bo->seq_valid))
259 wake_up_all(&bo->event_queue);
260
261 bo->val_seq = sequence;
262 bo->seq_valid = true;
263 } else {
264 bo->seq_valid = false;
265 }
266
267 return 0;
268}
269EXPORT_SYMBOL(ttm_bo_reserve);
270
271static void ttm_bo_ref_bug(struct kref *list_kref)
272{
273 BUG();
274}
275
276void ttm_bo_list_ref_sub(struct ttm_buffer_object *bo, int count,
277 bool never_free)
278{
279 kref_sub(&bo->list_kref, count,
280 (never_free) ? ttm_bo_ref_bug : ttm_bo_release_list);
281}
282
283int ttm_bo_reserve(struct ttm_buffer_object *bo,
284 bool interruptible,
285 bool no_wait, bool use_sequence, uint32_t sequence)
286{
287 struct ttm_bo_global *glob = bo->glob;
288 int put_count = 0;
289 int ret;
290
291 spin_lock(&glob->lru_lock);
292 ret = ttm_bo_reserve_locked(bo, interruptible, no_wait, use_sequence,
293 sequence);
294 if (likely(ret == 0))
295 put_count = ttm_bo_del_from_lru(bo);
296 spin_unlock(&glob->lru_lock);
297
298 ttm_bo_list_ref_sub(bo, put_count, true);
299
300 return ret;
301}
302
303void ttm_bo_unreserve_locked(struct ttm_buffer_object *bo)
304{
305 ttm_bo_add_to_lru(bo);
306 atomic_set(&bo->reserved, 0);
307 wake_up_all(&bo->event_queue);
308}
309
310void ttm_bo_unreserve(struct ttm_buffer_object *bo)
311{
312 struct ttm_bo_global *glob = bo->glob;
313
314 spin_lock(&glob->lru_lock);
315 ttm_bo_unreserve_locked(bo);
316 spin_unlock(&glob->lru_lock);
317}
318EXPORT_SYMBOL(ttm_bo_unreserve);
319
320/*
321 * Call bo->mutex locked.
322 */
323static int ttm_bo_add_ttm(struct ttm_buffer_object *bo, bool zero_alloc)
324{
325 struct ttm_bo_device *bdev = bo->bdev;
326 struct ttm_bo_global *glob = bo->glob;
327 int ret = 0;
328 uint32_t page_flags = 0;
329
330 TTM_ASSERT_LOCKED(&bo->mutex);
331 bo->ttm = NULL;
332
333 if (bdev->need_dma32)
334 page_flags |= TTM_PAGE_FLAG_DMA32;
335
336 switch (bo->type) {
337 case ttm_bo_type_device:
338 if (zero_alloc)
339 page_flags |= TTM_PAGE_FLAG_ZERO_ALLOC;
340 case ttm_bo_type_kernel:
341 bo->ttm = bdev->driver->ttm_tt_create(bdev, bo->num_pages << PAGE_SHIFT,
342 page_flags, glob->dummy_read_page);
343 if (unlikely(bo->ttm == NULL))
344 ret = -ENOMEM;
345 break;
346 case ttm_bo_type_sg:
347 bo->ttm = bdev->driver->ttm_tt_create(bdev, bo->num_pages << PAGE_SHIFT,
348 page_flags | TTM_PAGE_FLAG_SG,
349 glob->dummy_read_page);
350 if (unlikely(bo->ttm == NULL)) {
351 ret = -ENOMEM;
352 break;
353 }
354 bo->ttm->sg = bo->sg;
355 break;
356 default:
357 pr_err("Illegal buffer object type\n");
358 ret = -EINVAL;
359 break;
360 }
361
362 return ret;
363}
364
365static int ttm_bo_handle_move_mem(struct ttm_buffer_object *bo,
366 struct ttm_mem_reg *mem,
367 bool evict, bool interruptible,
368 bool no_wait_reserve, bool no_wait_gpu)
369{
370 struct ttm_bo_device *bdev = bo->bdev;
371 bool old_is_pci = ttm_mem_reg_is_pci(bdev, &bo->mem);
372 bool new_is_pci = ttm_mem_reg_is_pci(bdev, mem);
373 struct ttm_mem_type_manager *old_man = &bdev->man[bo->mem.mem_type];
374 struct ttm_mem_type_manager *new_man = &bdev->man[mem->mem_type];
375 int ret = 0;
376
377 if (old_is_pci || new_is_pci ||
378 ((mem->placement & bo->mem.placement & TTM_PL_MASK_CACHING) == 0)) {
379 ret = ttm_mem_io_lock(old_man, true);
380 if (unlikely(ret != 0))
381 goto out_err;
382 ttm_bo_unmap_virtual_locked(bo);
383 ttm_mem_io_unlock(old_man);
384 }
385
386 /*
387 * Create and bind a ttm if required.
388 */
389
390 if (!(new_man->flags & TTM_MEMTYPE_FLAG_FIXED)) {
391 if (bo->ttm == NULL) {
392 bool zero = !(old_man->flags & TTM_MEMTYPE_FLAG_FIXED);
393 ret = ttm_bo_add_ttm(bo, zero);
394 if (ret)
395 goto out_err;
396 }
397
398 ret = ttm_tt_set_placement_caching(bo->ttm, mem->placement);
399 if (ret)
400 goto out_err;
401
402 if (mem->mem_type != TTM_PL_SYSTEM) {
403 ret = ttm_tt_bind(bo->ttm, mem);
404 if (ret)
405 goto out_err;
406 }
407
408 if (bo->mem.mem_type == TTM_PL_SYSTEM) {
409 if (bdev->driver->move_notify)
410 bdev->driver->move_notify(bo, mem);
411 bo->mem = *mem;
412 mem->mm_node = NULL;
413 goto moved;
414 }
415 }
416
417 if (bdev->driver->move_notify)
418 bdev->driver->move_notify(bo, mem);
419
420 if (!(old_man->flags & TTM_MEMTYPE_FLAG_FIXED) &&
421 !(new_man->flags & TTM_MEMTYPE_FLAG_FIXED))
422 ret = ttm_bo_move_ttm(bo, evict, no_wait_reserve, no_wait_gpu, mem);
423 else if (bdev->driver->move)
424 ret = bdev->driver->move(bo, evict, interruptible,
425 no_wait_reserve, no_wait_gpu, mem);
426 else
427 ret = ttm_bo_move_memcpy(bo, evict, no_wait_reserve, no_wait_gpu, mem);
428
429 if (ret) {
430 if (bdev->driver->move_notify) {
431 struct ttm_mem_reg tmp_mem = *mem;
432 *mem = bo->mem;
433 bo->mem = tmp_mem;
434 bdev->driver->move_notify(bo, mem);
435 bo->mem = *mem;
436 }
437
438 goto out_err;
439 }
440
441moved:
442 if (bo->evicted) {
443 ret = bdev->driver->invalidate_caches(bdev, bo->mem.placement);
444 if (ret)
445 pr_err("Can not flush read caches\n");
446 bo->evicted = false;
447 }
448
449 if (bo->mem.mm_node) {
450 bo->offset = (bo->mem.start << PAGE_SHIFT) +
451 bdev->man[bo->mem.mem_type].gpu_offset;
452 bo->cur_placement = bo->mem.placement;
453 } else
454 bo->offset = 0;
455
456 return 0;
457
458out_err:
459 new_man = &bdev->man[bo->mem.mem_type];
460 if ((new_man->flags & TTM_MEMTYPE_FLAG_FIXED) && bo->ttm) {
461 ttm_tt_unbind(bo->ttm);
462 ttm_tt_destroy(bo->ttm);
463 bo->ttm = NULL;
464 }
465
466 return ret;
467}
468
469/**
470 * Call bo::reserved.
471 * Will release GPU memory type usage on destruction.
472 * This is the place to put in driver specific hooks to release
473 * driver private resources.
474 * Will release the bo::reserved lock.
475 */
476
477static void ttm_bo_cleanup_memtype_use(struct ttm_buffer_object *bo)
478{
479 if (bo->bdev->driver->move_notify)
480 bo->bdev->driver->move_notify(bo, NULL);
481
482 if (bo->ttm) {
483 ttm_tt_unbind(bo->ttm);
484 ttm_tt_destroy(bo->ttm);
485 bo->ttm = NULL;
486 }
487 ttm_bo_mem_put(bo, &bo->mem);
488
489 atomic_set(&bo->reserved, 0);
490
491 /*
492 * Make processes trying to reserve really pick it up.
493 */
494 smp_mb__after_atomic_dec();
495 wake_up_all(&bo->event_queue);
496}
497
498static void ttm_bo_cleanup_refs_or_queue(struct ttm_buffer_object *bo)
499{
500 struct ttm_bo_device *bdev = bo->bdev;
501 struct ttm_bo_global *glob = bo->glob;
502 struct ttm_bo_driver *driver;
503 void *sync_obj = NULL;
504 void *sync_obj_arg;
505 int put_count;
506 int ret;
507
508 spin_lock(&bdev->fence_lock);
509 (void) ttm_bo_wait(bo, false, false, true);
510 if (!bo->sync_obj) {
511
512 spin_lock(&glob->lru_lock);
513
514 /**
515 * Lock inversion between bo:reserve and bdev::fence_lock here,
516 * but that's OK, since we're only trylocking.
517 */
518
519 ret = ttm_bo_reserve_locked(bo, false, true, false, 0);
520
521 if (unlikely(ret == -EBUSY))
522 goto queue;
523
524 spin_unlock(&bdev->fence_lock);
525 put_count = ttm_bo_del_from_lru(bo);
526
527 spin_unlock(&glob->lru_lock);
528 ttm_bo_cleanup_memtype_use(bo);
529
530 ttm_bo_list_ref_sub(bo, put_count, true);
531
532 return;
533 } else {
534 spin_lock(&glob->lru_lock);
535 }
536queue:
537 driver = bdev->driver;
538 if (bo->sync_obj)
539 sync_obj = driver->sync_obj_ref(bo->sync_obj);
540 sync_obj_arg = bo->sync_obj_arg;
541
542 kref_get(&bo->list_kref);
543 list_add_tail(&bo->ddestroy, &bdev->ddestroy);
544 spin_unlock(&glob->lru_lock);
545 spin_unlock(&bdev->fence_lock);
546
547 if (sync_obj) {
548 driver->sync_obj_flush(sync_obj, sync_obj_arg);
549 driver->sync_obj_unref(&sync_obj);
550 }
551 schedule_delayed_work(&bdev->wq,
552 ((HZ / 100) < 1) ? 1 : HZ / 100);
553}
554
555/**
556 * function ttm_bo_cleanup_refs
557 * If bo idle, remove from delayed- and lru lists, and unref.
558 * If not idle, do nothing.
559 *
560 * @interruptible Any sleeps should occur interruptibly.
561 * @no_wait_reserve Never wait for reserve. Return -EBUSY instead.
562 * @no_wait_gpu Never wait for gpu. Return -EBUSY instead.
563 */
564
565static int ttm_bo_cleanup_refs(struct ttm_buffer_object *bo,
566 bool interruptible,
567 bool no_wait_reserve,
568 bool no_wait_gpu)
569{
570 struct ttm_bo_device *bdev = bo->bdev;
571 struct ttm_bo_global *glob = bo->glob;
572 int put_count;
573 int ret = 0;
574
575retry:
576 spin_lock(&bdev->fence_lock);
577 ret = ttm_bo_wait(bo, false, interruptible, no_wait_gpu);
578 spin_unlock(&bdev->fence_lock);
579
580 if (unlikely(ret != 0))
581 return ret;
582
583 spin_lock(&glob->lru_lock);
584
585 if (unlikely(list_empty(&bo->ddestroy))) {
586 spin_unlock(&glob->lru_lock);
587 return 0;
588 }
589
590 ret = ttm_bo_reserve_locked(bo, interruptible,
591 no_wait_reserve, false, 0);
592
593 if (unlikely(ret != 0)) {
594 spin_unlock(&glob->lru_lock);
595 return ret;
596 }
597
598 /**
599 * We can re-check for sync object without taking
600 * the bo::lock since setting the sync object requires
601 * also bo::reserved. A busy object at this point may
602 * be caused by another thread recently starting an accelerated
603 * eviction.
604 */
605
606 if (unlikely(bo->sync_obj)) {
607 atomic_set(&bo->reserved, 0);
608 wake_up_all(&bo->event_queue);
609 spin_unlock(&glob->lru_lock);
610 goto retry;
611 }
612
613 put_count = ttm_bo_del_from_lru(bo);
614 list_del_init(&bo->ddestroy);
615 ++put_count;
616
617 spin_unlock(&glob->lru_lock);
618 ttm_bo_cleanup_memtype_use(bo);
619
620 ttm_bo_list_ref_sub(bo, put_count, true);
621
622 return 0;
623}
624
625/**
626 * Traverse the delayed list, and call ttm_bo_cleanup_refs on all
627 * encountered buffers.
628 */
629
630static int ttm_bo_delayed_delete(struct ttm_bo_device *bdev, bool remove_all)
631{
632 struct ttm_bo_global *glob = bdev->glob;
633 struct ttm_buffer_object *entry = NULL;
634 int ret = 0;
635
636 spin_lock(&glob->lru_lock);
637 if (list_empty(&bdev->ddestroy))
638 goto out_unlock;
639
640 entry = list_first_entry(&bdev->ddestroy,
641 struct ttm_buffer_object, ddestroy);
642 kref_get(&entry->list_kref);
643
644 for (;;) {
645 struct ttm_buffer_object *nentry = NULL;
646
647 if (entry->ddestroy.next != &bdev->ddestroy) {
648 nentry = list_first_entry(&entry->ddestroy,
649 struct ttm_buffer_object, ddestroy);
650 kref_get(&nentry->list_kref);
651 }
652
653 spin_unlock(&glob->lru_lock);
654 ret = ttm_bo_cleanup_refs(entry, false, !remove_all,
655 !remove_all);
656 kref_put(&entry->list_kref, ttm_bo_release_list);
657 entry = nentry;
658
659 if (ret || !entry)
660 goto out;
661
662 spin_lock(&glob->lru_lock);
663 if (list_empty(&entry->ddestroy))
664 break;
665 }
666
667out_unlock:
668 spin_unlock(&glob->lru_lock);
669out:
670 if (entry)
671 kref_put(&entry->list_kref, ttm_bo_release_list);
672 return ret;
673}
674
675static void ttm_bo_delayed_workqueue(struct work_struct *work)
676{
677 struct ttm_bo_device *bdev =
678 container_of(work, struct ttm_bo_device, wq.work);
679
680 if (ttm_bo_delayed_delete(bdev, false)) {
681 schedule_delayed_work(&bdev->wq,
682 ((HZ / 100) < 1) ? 1 : HZ / 100);
683 }
684}
685
686static void ttm_bo_release(struct kref *kref)
687{
688 struct ttm_buffer_object *bo =
689 container_of(kref, struct ttm_buffer_object, kref);
690 struct ttm_bo_device *bdev = bo->bdev;
691 struct ttm_mem_type_manager *man = &bdev->man[bo->mem.mem_type];
692
693 if (likely(bo->vm_node != NULL)) {
694 rb_erase(&bo->vm_rb, &bdev->addr_space_rb);
695 drm_mm_put_block(bo->vm_node);
696 bo->vm_node = NULL;
697 }
698 write_unlock(&bdev->vm_lock);
699 ttm_mem_io_lock(man, false);
700 ttm_mem_io_free_vm(bo);
701 ttm_mem_io_unlock(man);
702 ttm_bo_cleanup_refs_or_queue(bo);
703 kref_put(&bo->list_kref, ttm_bo_release_list);
704 write_lock(&bdev->vm_lock);
705}
706
707void ttm_bo_unref(struct ttm_buffer_object **p_bo)
708{
709 struct ttm_buffer_object *bo = *p_bo;
710 struct ttm_bo_device *bdev = bo->bdev;
711
712 *p_bo = NULL;
713 write_lock(&bdev->vm_lock);
714 kref_put(&bo->kref, ttm_bo_release);
715 write_unlock(&bdev->vm_lock);
716}
717EXPORT_SYMBOL(ttm_bo_unref);
718
719int ttm_bo_lock_delayed_workqueue(struct ttm_bo_device *bdev)
720{
721 return cancel_delayed_work_sync(&bdev->wq);
722}
723EXPORT_SYMBOL(ttm_bo_lock_delayed_workqueue);
724
725void ttm_bo_unlock_delayed_workqueue(struct ttm_bo_device *bdev, int resched)
726{
727 if (resched)
728 schedule_delayed_work(&bdev->wq,
729 ((HZ / 100) < 1) ? 1 : HZ / 100);
730}
731EXPORT_SYMBOL(ttm_bo_unlock_delayed_workqueue);
732
733static int ttm_bo_evict(struct ttm_buffer_object *bo, bool interruptible,
734 bool no_wait_reserve, bool no_wait_gpu)
735{
736 struct ttm_bo_device *bdev = bo->bdev;
737 struct ttm_mem_reg evict_mem;
738 struct ttm_placement placement;
739 int ret = 0;
740
741 spin_lock(&bdev->fence_lock);
742 ret = ttm_bo_wait(bo, false, interruptible, no_wait_gpu);
743 spin_unlock(&bdev->fence_lock);
744
745 if (unlikely(ret != 0)) {
746 if (ret != -ERESTARTSYS) {
747 pr_err("Failed to expire sync object before buffer eviction\n");
748 }
749 goto out;
750 }
751
752 BUG_ON(!atomic_read(&bo->reserved));
753
754 evict_mem = bo->mem;
755 evict_mem.mm_node = NULL;
756 evict_mem.bus.io_reserved_vm = false;
757 evict_mem.bus.io_reserved_count = 0;
758
759 placement.fpfn = 0;
760 placement.lpfn = 0;
761 placement.num_placement = 0;
762 placement.num_busy_placement = 0;
763 bdev->driver->evict_flags(bo, &placement);
764 ret = ttm_bo_mem_space(bo, &placement, &evict_mem, interruptible,
765 no_wait_reserve, no_wait_gpu);
766 if (ret) {
767 if (ret != -ERESTARTSYS) {
768 pr_err("Failed to find memory space for buffer 0x%p eviction\n",
769 bo);
770 ttm_bo_mem_space_debug(bo, &placement);
771 }
772 goto out;
773 }
774
775 ret = ttm_bo_handle_move_mem(bo, &evict_mem, true, interruptible,
776 no_wait_reserve, no_wait_gpu);
777 if (ret) {
778 if (ret != -ERESTARTSYS)
779 pr_err("Buffer eviction failed\n");
780 ttm_bo_mem_put(bo, &evict_mem);
781 goto out;
782 }
783 bo->evicted = true;
784out:
785 return ret;
786}
787
788static int ttm_mem_evict_first(struct ttm_bo_device *bdev,
789 uint32_t mem_type,
790 bool interruptible, bool no_wait_reserve,
791 bool no_wait_gpu)
792{
793 struct ttm_bo_global *glob = bdev->glob;
794 struct ttm_mem_type_manager *man = &bdev->man[mem_type];
795 struct ttm_buffer_object *bo;
796 int ret, put_count = 0;
797
798retry:
799 spin_lock(&glob->lru_lock);
800 if (list_empty(&man->lru)) {
801 spin_unlock(&glob->lru_lock);
802 return -EBUSY;
803 }
804
805 bo = list_first_entry(&man->lru, struct ttm_buffer_object, lru);
806 kref_get(&bo->list_kref);
807
808 if (!list_empty(&bo->ddestroy)) {
809 spin_unlock(&glob->lru_lock);
810 ret = ttm_bo_cleanup_refs(bo, interruptible,
811 no_wait_reserve, no_wait_gpu);
812 kref_put(&bo->list_kref, ttm_bo_release_list);
813
814 if (likely(ret == 0 || ret == -ERESTARTSYS))
815 return ret;
816
817 goto retry;
818 }
819
820 ret = ttm_bo_reserve_locked(bo, false, no_wait_reserve, false, 0);
821
822 if (unlikely(ret == -EBUSY)) {
823 spin_unlock(&glob->lru_lock);
824 if (likely(!no_wait_gpu))
825 ret = ttm_bo_wait_unreserved(bo, interruptible);
826
827 kref_put(&bo->list_kref, ttm_bo_release_list);
828
829 /**
830 * We *need* to retry after releasing the lru lock.
831 */
832
833 if (unlikely(ret != 0))
834 return ret;
835 goto retry;
836 }
837
838 put_count = ttm_bo_del_from_lru(bo);
839 spin_unlock(&glob->lru_lock);
840
841 BUG_ON(ret != 0);
842
843 ttm_bo_list_ref_sub(bo, put_count, true);
844
845 ret = ttm_bo_evict(bo, interruptible, no_wait_reserve, no_wait_gpu);
846 ttm_bo_unreserve(bo);
847
848 kref_put(&bo->list_kref, ttm_bo_release_list);
849 return ret;
850}
851
852void ttm_bo_mem_put(struct ttm_buffer_object *bo, struct ttm_mem_reg *mem)
853{
854 struct ttm_mem_type_manager *man = &bo->bdev->man[mem->mem_type];
855
856 if (mem->mm_node)
857 (*man->func->put_node)(man, mem);
858}
859EXPORT_SYMBOL(ttm_bo_mem_put);
860
861/**
862 * Repeatedly evict memory from the LRU for @mem_type until we create enough
863 * space, or we've evicted everything and there isn't enough space.
864 */
865static int ttm_bo_mem_force_space(struct ttm_buffer_object *bo,
866 uint32_t mem_type,
867 struct ttm_placement *placement,
868 struct ttm_mem_reg *mem,
869 bool interruptible,
870 bool no_wait_reserve,
871 bool no_wait_gpu)
872{
873 struct ttm_bo_device *bdev = bo->bdev;
874 struct ttm_mem_type_manager *man = &bdev->man[mem_type];
875 int ret;
876
877 do {
878 ret = (*man->func->get_node)(man, bo, placement, mem);
879 if (unlikely(ret != 0))
880 return ret;
881 if (mem->mm_node)
882 break;
883 ret = ttm_mem_evict_first(bdev, mem_type, interruptible,
884 no_wait_reserve, no_wait_gpu);
885 if (unlikely(ret != 0))
886 return ret;
887 } while (1);
888 if (mem->mm_node == NULL)
889 return -ENOMEM;
890 mem->mem_type = mem_type;
891 return 0;
892}
893
894static uint32_t ttm_bo_select_caching(struct ttm_mem_type_manager *man,
895 uint32_t cur_placement,
896 uint32_t proposed_placement)
897{
898 uint32_t caching = proposed_placement & TTM_PL_MASK_CACHING;
899 uint32_t result = proposed_placement & ~TTM_PL_MASK_CACHING;
900
901 /**
902 * Keep current caching if possible.
903 */
904
905 if ((cur_placement & caching) != 0)
906 result |= (cur_placement & caching);
907 else if ((man->default_caching & caching) != 0)
908 result |= man->default_caching;
909 else if ((TTM_PL_FLAG_CACHED & caching) != 0)
910 result |= TTM_PL_FLAG_CACHED;
911 else if ((TTM_PL_FLAG_WC & caching) != 0)
912 result |= TTM_PL_FLAG_WC;
913 else if ((TTM_PL_FLAG_UNCACHED & caching) != 0)
914 result |= TTM_PL_FLAG_UNCACHED;
915
916 return result;
917}
918
919static bool ttm_bo_mt_compatible(struct ttm_mem_type_manager *man,
920 uint32_t mem_type,
921 uint32_t proposed_placement,
922 uint32_t *masked_placement)
923{
924 uint32_t cur_flags = ttm_bo_type_flags(mem_type);
925
926 if ((cur_flags & proposed_placement & TTM_PL_MASK_MEM) == 0)
927 return false;
928
929 if ((proposed_placement & man->available_caching) == 0)
930 return false;
931
932 cur_flags |= (proposed_placement & man->available_caching);
933
934 *masked_placement = cur_flags;
935 return true;
936}
937
938/**
939 * Creates space for memory region @mem according to its type.
940 *
941 * This function first searches for free space in compatible memory types in
942 * the priority order defined by the driver. If free space isn't found, then
943 * ttm_bo_mem_force_space is attempted in priority order to evict and find
944 * space.
945 */
946int ttm_bo_mem_space(struct ttm_buffer_object *bo,
947 struct ttm_placement *placement,
948 struct ttm_mem_reg *mem,
949 bool interruptible, bool no_wait_reserve,
950 bool no_wait_gpu)
951{
952 struct ttm_bo_device *bdev = bo->bdev;
953 struct ttm_mem_type_manager *man;
954 uint32_t mem_type = TTM_PL_SYSTEM;
955 uint32_t cur_flags = 0;
956 bool type_found = false;
957 bool type_ok = false;
958 bool has_erestartsys = false;
959 int i, ret;
960
961 mem->mm_node = NULL;
962 for (i = 0; i < placement->num_placement; ++i) {
963 ret = ttm_mem_type_from_flags(placement->placement[i],
964 &mem_type);
965 if (ret)
966 return ret;
967 man = &bdev->man[mem_type];
968
969 type_ok = ttm_bo_mt_compatible(man,
970 mem_type,
971 placement->placement[i],
972 &cur_flags);
973
974 if (!type_ok)
975 continue;
976
977 cur_flags = ttm_bo_select_caching(man, bo->mem.placement,
978 cur_flags);
979 /*
980 * Use the access and other non-mapping-related flag bits from
981 * the memory placement flags to the current flags
982 */
983 ttm_flag_masked(&cur_flags, placement->placement[i],
984 ~TTM_PL_MASK_MEMTYPE);
985
986 if (mem_type == TTM_PL_SYSTEM)
987 break;
988
989 if (man->has_type && man->use_type) {
990 type_found = true;
991 ret = (*man->func->get_node)(man, bo, placement, mem);
992 if (unlikely(ret))
993 return ret;
994 }
995 if (mem->mm_node)
996 break;
997 }
998
999 if ((type_ok && (mem_type == TTM_PL_SYSTEM)) || mem->mm_node) {
1000 mem->mem_type = mem_type;
1001 mem->placement = cur_flags;
1002 return 0;
1003 }
1004
1005 if (!type_found)
1006 return -EINVAL;
1007
1008 for (i = 0; i < placement->num_busy_placement; ++i) {
1009 ret = ttm_mem_type_from_flags(placement->busy_placement[i],
1010 &mem_type);
1011 if (ret)
1012 return ret;
1013 man = &bdev->man[mem_type];
1014 if (!man->has_type)
1015 continue;
1016 if (!ttm_bo_mt_compatible(man,
1017 mem_type,
1018 placement->busy_placement[i],
1019 &cur_flags))
1020 continue;
1021
1022 cur_flags = ttm_bo_select_caching(man, bo->mem.placement,
1023 cur_flags);
1024 /*
1025 * Use the access and other non-mapping-related flag bits from
1026 * the memory placement flags to the current flags
1027 */
1028 ttm_flag_masked(&cur_flags, placement->busy_placement[i],
1029 ~TTM_PL_MASK_MEMTYPE);
1030
1031
1032 if (mem_type == TTM_PL_SYSTEM) {
1033 mem->mem_type = mem_type;
1034 mem->placement = cur_flags;
1035 mem->mm_node = NULL;
1036 return 0;
1037 }
1038
1039 ret = ttm_bo_mem_force_space(bo, mem_type, placement, mem,
1040 interruptible, no_wait_reserve, no_wait_gpu);
1041 if (ret == 0 && mem->mm_node) {
1042 mem->placement = cur_flags;
1043 return 0;
1044 }
1045 if (ret == -ERESTARTSYS)
1046 has_erestartsys = true;
1047 }
1048 ret = (has_erestartsys) ? -ERESTARTSYS : -ENOMEM;
1049 return ret;
1050}
1051EXPORT_SYMBOL(ttm_bo_mem_space);
1052
1053int ttm_bo_wait_cpu(struct ttm_buffer_object *bo, bool no_wait)
1054{
1055 if ((atomic_read(&bo->cpu_writers) > 0) && no_wait)
1056 return -EBUSY;
1057
1058 return wait_event_interruptible(bo->event_queue,
1059 atomic_read(&bo->cpu_writers) == 0);
1060}
1061EXPORT_SYMBOL(ttm_bo_wait_cpu);
1062
1063int ttm_bo_move_buffer(struct ttm_buffer_object *bo,
1064 struct ttm_placement *placement,
1065 bool interruptible, bool no_wait_reserve,
1066 bool no_wait_gpu)
1067{
1068 int ret = 0;
1069 struct ttm_mem_reg mem;
1070 struct ttm_bo_device *bdev = bo->bdev;
1071
1072 BUG_ON(!atomic_read(&bo->reserved));
1073
1074 /*
1075 * FIXME: It's possible to pipeline buffer moves.
1076 * Have the driver move function wait for idle when necessary,
1077 * instead of doing it here.
1078 */
1079 spin_lock(&bdev->fence_lock);
1080 ret = ttm_bo_wait(bo, false, interruptible, no_wait_gpu);
1081 spin_unlock(&bdev->fence_lock);
1082 if (ret)
1083 return ret;
1084 mem.num_pages = bo->num_pages;
1085 mem.size = mem.num_pages << PAGE_SHIFT;
1086 mem.page_alignment = bo->mem.page_alignment;
1087 mem.bus.io_reserved_vm = false;
1088 mem.bus.io_reserved_count = 0;
1089 /*
1090 * Determine where to move the buffer.
1091 */
1092 ret = ttm_bo_mem_space(bo, placement, &mem, interruptible, no_wait_reserve, no_wait_gpu);
1093 if (ret)
1094 goto out_unlock;
1095 ret = ttm_bo_handle_move_mem(bo, &mem, false, interruptible, no_wait_reserve, no_wait_gpu);
1096out_unlock:
1097 if (ret && mem.mm_node)
1098 ttm_bo_mem_put(bo, &mem);
1099 return ret;
1100}
1101
1102static int ttm_bo_mem_compat(struct ttm_placement *placement,
1103 struct ttm_mem_reg *mem)
1104{
1105 int i;
1106
1107 if (mem->mm_node && placement->lpfn != 0 &&
1108 (mem->start < placement->fpfn ||
1109 mem->start + mem->num_pages > placement->lpfn))
1110 return -1;
1111
1112 for (i = 0; i < placement->num_placement; i++) {
1113 if ((placement->placement[i] & mem->placement &
1114 TTM_PL_MASK_CACHING) &&
1115 (placement->placement[i] & mem->placement &
1116 TTM_PL_MASK_MEM))
1117 return i;
1118 }
1119 return -1;
1120}
1121
1122int ttm_bo_validate(struct ttm_buffer_object *bo,
1123 struct ttm_placement *placement,
1124 bool interruptible, bool no_wait_reserve,
1125 bool no_wait_gpu)
1126{
1127 int ret;
1128
1129 BUG_ON(!atomic_read(&bo->reserved));
1130 /* Check that range is valid */
1131 if (placement->lpfn || placement->fpfn)
1132 if (placement->fpfn > placement->lpfn ||
1133 (placement->lpfn - placement->fpfn) < bo->num_pages)
1134 return -EINVAL;
1135 /*
1136 * Check whether we need to move buffer.
1137 */
1138 ret = ttm_bo_mem_compat(placement, &bo->mem);
1139 if (ret < 0) {
1140 ret = ttm_bo_move_buffer(bo, placement, interruptible, no_wait_reserve, no_wait_gpu);
1141 if (ret)
1142 return ret;
1143 } else {
1144 /*
1145 * Use the access and other non-mapping-related flag bits from
1146 * the compatible memory placement flags to the active flags
1147 */
1148 ttm_flag_masked(&bo->mem.placement, placement->placement[ret],
1149 ~TTM_PL_MASK_MEMTYPE);
1150 }
1151 /*
1152 * We might need to add a TTM.
1153 */
1154 if (bo->mem.mem_type == TTM_PL_SYSTEM && bo->ttm == NULL) {
1155 ret = ttm_bo_add_ttm(bo, true);
1156 if (ret)
1157 return ret;
1158 }
1159 return 0;
1160}
1161EXPORT_SYMBOL(ttm_bo_validate);
1162
1163int ttm_bo_check_placement(struct ttm_buffer_object *bo,
1164 struct ttm_placement *placement)
1165{
1166 BUG_ON((placement->fpfn || placement->lpfn) &&
1167 (bo->mem.num_pages > (placement->lpfn - placement->fpfn)));
1168
1169 return 0;
1170}
1171
1172int ttm_bo_init(struct ttm_bo_device *bdev,
1173 struct ttm_buffer_object *bo,
1174 unsigned long size,
1175 enum ttm_bo_type type,
1176 struct ttm_placement *placement,
1177 uint32_t page_alignment,
1178 unsigned long buffer_start,
1179 bool interruptible,
1180 struct file *persistent_swap_storage,
1181 size_t acc_size,
1182 struct sg_table *sg,
1183 void (*destroy) (struct ttm_buffer_object *))
1184{
1185 int ret = 0;
1186 unsigned long num_pages;
1187 struct ttm_mem_global *mem_glob = bdev->glob->mem_glob;
1188
1189 ret = ttm_mem_global_alloc(mem_glob, acc_size, false, false);
1190 if (ret) {
1191 pr_err("Out of kernel memory\n");
1192 if (destroy)
1193 (*destroy)(bo);
1194 else
1195 kfree(bo);
1196 return -ENOMEM;
1197 }
1198
1199 size += buffer_start & ~PAGE_MASK;
1200 num_pages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
1201 if (num_pages == 0) {
1202 pr_err("Illegal buffer object size\n");
1203 if (destroy)
1204 (*destroy)(bo);
1205 else
1206 kfree(bo);
1207 ttm_mem_global_free(mem_glob, acc_size);
1208 return -EINVAL;
1209 }
1210 bo->destroy = destroy;
1211
1212 kref_init(&bo->kref);
1213 kref_init(&bo->list_kref);
1214 atomic_set(&bo->cpu_writers, 0);
1215 atomic_set(&bo->reserved, 1);
1216 init_waitqueue_head(&bo->event_queue);
1217 INIT_LIST_HEAD(&bo->lru);
1218 INIT_LIST_HEAD(&bo->ddestroy);
1219 INIT_LIST_HEAD(&bo->swap);
1220 INIT_LIST_HEAD(&bo->io_reserve_lru);
1221 bo->bdev = bdev;
1222 bo->glob = bdev->glob;
1223 bo->type = type;
1224 bo->num_pages = num_pages;
1225 bo->mem.size = num_pages << PAGE_SHIFT;
1226 bo->mem.mem_type = TTM_PL_SYSTEM;
1227 bo->mem.num_pages = bo->num_pages;
1228 bo->mem.mm_node = NULL;
1229 bo->mem.page_alignment = page_alignment;
1230 bo->mem.bus.io_reserved_vm = false;
1231 bo->mem.bus.io_reserved_count = 0;
1232 bo->buffer_start = buffer_start & PAGE_MASK;
1233 bo->priv_flags = 0;
1234 bo->mem.placement = (TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED);
1235 bo->seq_valid = false;
1236 bo->persistent_swap_storage = persistent_swap_storage;
1237 bo->acc_size = acc_size;
1238 bo->sg = sg;
1239 atomic_inc(&bo->glob->bo_count);
1240
1241 ret = ttm_bo_check_placement(bo, placement);
1242 if (unlikely(ret != 0))
1243 goto out_err;
1244
1245 /*
1246 * For ttm_bo_type_device buffers, allocate
1247 * address space from the device.
1248 */
1249 if (bo->type == ttm_bo_type_device ||
1250 bo->type == ttm_bo_type_sg) {
1251 ret = ttm_bo_setup_vm(bo);
1252 if (ret)
1253 goto out_err;
1254 }
1255
1256 ret = ttm_bo_validate(bo, placement, interruptible, false, false);
1257 if (ret)
1258 goto out_err;
1259
1260 ttm_bo_unreserve(bo);
1261 return 0;
1262
1263out_err:
1264 ttm_bo_unreserve(bo);
1265 ttm_bo_unref(&bo);
1266
1267 return ret;
1268}
1269EXPORT_SYMBOL(ttm_bo_init);
1270
1271size_t ttm_bo_acc_size(struct ttm_bo_device *bdev,
1272 unsigned long bo_size,
1273 unsigned struct_size)
1274{
1275 unsigned npages = (PAGE_ALIGN(bo_size)) >> PAGE_SHIFT;
1276 size_t size = 0;
1277
1278 size += ttm_round_pot(struct_size);
1279 size += PAGE_ALIGN(npages * sizeof(void *));
1280 size += ttm_round_pot(sizeof(struct ttm_tt));
1281 return size;
1282}
1283EXPORT_SYMBOL(ttm_bo_acc_size);
1284
1285size_t ttm_bo_dma_acc_size(struct ttm_bo_device *bdev,
1286 unsigned long bo_size,
1287 unsigned struct_size)
1288{
1289 unsigned npages = (PAGE_ALIGN(bo_size)) >> PAGE_SHIFT;
1290 size_t size = 0;
1291
1292 size += ttm_round_pot(struct_size);
1293 size += PAGE_ALIGN(npages * sizeof(void *));
1294 size += PAGE_ALIGN(npages * sizeof(dma_addr_t));
1295 size += ttm_round_pot(sizeof(struct ttm_dma_tt));
1296 return size;
1297}
1298EXPORT_SYMBOL(ttm_bo_dma_acc_size);
1299
1300int ttm_bo_create(struct ttm_bo_device *bdev,
1301 unsigned long size,
1302 enum ttm_bo_type type,
1303 struct ttm_placement *placement,
1304 uint32_t page_alignment,
1305 unsigned long buffer_start,
1306 bool interruptible,
1307 struct file *persistent_swap_storage,
1308 struct ttm_buffer_object **p_bo)
1309{
1310 struct ttm_buffer_object *bo;
1311 size_t acc_size;
1312 int ret;
1313
1314 bo = kzalloc(sizeof(*bo), GFP_KERNEL);
1315 if (unlikely(bo == NULL))
1316 return -ENOMEM;
1317
1318 acc_size = ttm_bo_acc_size(bdev, size, sizeof(struct ttm_buffer_object));
1319 ret = ttm_bo_init(bdev, bo, size, type, placement, page_alignment,
1320 buffer_start, interruptible,
1321 persistent_swap_storage, acc_size, NULL, NULL);
1322 if (likely(ret == 0))
1323 *p_bo = bo;
1324
1325 return ret;
1326}
1327EXPORT_SYMBOL(ttm_bo_create);
1328
1329static int ttm_bo_force_list_clean(struct ttm_bo_device *bdev,
1330 unsigned mem_type, bool allow_errors)
1331{
1332 struct ttm_mem_type_manager *man = &bdev->man[mem_type];
1333 struct ttm_bo_global *glob = bdev->glob;
1334 int ret;
1335
1336 /*
1337 * Can't use standard list traversal since we're unlocking.
1338 */
1339
1340 spin_lock(&glob->lru_lock);
1341 while (!list_empty(&man->lru)) {
1342 spin_unlock(&glob->lru_lock);
1343 ret = ttm_mem_evict_first(bdev, mem_type, false, false, false);
1344 if (ret) {
1345 if (allow_errors) {
1346 return ret;
1347 } else {
1348 pr_err("Cleanup eviction failed\n");
1349 }
1350 }
1351 spin_lock(&glob->lru_lock);
1352 }
1353 spin_unlock(&glob->lru_lock);
1354 return 0;
1355}
1356
1357int ttm_bo_clean_mm(struct ttm_bo_device *bdev, unsigned mem_type)
1358{
1359 struct ttm_mem_type_manager *man;
1360 int ret = -EINVAL;
1361
1362 if (mem_type >= TTM_NUM_MEM_TYPES) {
1363 pr_err("Illegal memory type %d\n", mem_type);
1364 return ret;
1365 }
1366 man = &bdev->man[mem_type];
1367
1368 if (!man->has_type) {
1369 pr_err("Trying to take down uninitialized memory manager type %u\n",
1370 mem_type);
1371 return ret;
1372 }
1373
1374 man->use_type = false;
1375 man->has_type = false;
1376
1377 ret = 0;
1378 if (mem_type > 0) {
1379 ttm_bo_force_list_clean(bdev, mem_type, false);
1380
1381 ret = (*man->func->takedown)(man);
1382 }
1383
1384 return ret;
1385}
1386EXPORT_SYMBOL(ttm_bo_clean_mm);
1387
1388int ttm_bo_evict_mm(struct ttm_bo_device *bdev, unsigned mem_type)
1389{
1390 struct ttm_mem_type_manager *man = &bdev->man[mem_type];
1391
1392 if (mem_type == 0 || mem_type >= TTM_NUM_MEM_TYPES) {
1393 pr_err("Illegal memory manager memory type %u\n", mem_type);
1394 return -EINVAL;
1395 }
1396
1397 if (!man->has_type) {
1398 pr_err("Memory type %u has not been initialized\n", mem_type);
1399 return 0;
1400 }
1401
1402 return ttm_bo_force_list_clean(bdev, mem_type, true);
1403}
1404EXPORT_SYMBOL(ttm_bo_evict_mm);
1405
1406int ttm_bo_init_mm(struct ttm_bo_device *bdev, unsigned type,
1407 unsigned long p_size)
1408{
1409 int ret = -EINVAL;
1410 struct ttm_mem_type_manager *man;
1411
1412 BUG_ON(type >= TTM_NUM_MEM_TYPES);
1413 man = &bdev->man[type];
1414 BUG_ON(man->has_type);
1415 man->io_reserve_fastpath = true;
1416 man->use_io_reserve_lru = false;
1417 mutex_init(&man->io_reserve_mutex);
1418 INIT_LIST_HEAD(&man->io_reserve_lru);
1419
1420 ret = bdev->driver->init_mem_type(bdev, type, man);
1421 if (ret)
1422 return ret;
1423 man->bdev = bdev;
1424
1425 ret = 0;
1426 if (type != TTM_PL_SYSTEM) {
1427 ret = (*man->func->init)(man, p_size);
1428 if (ret)
1429 return ret;
1430 }
1431 man->has_type = true;
1432 man->use_type = true;
1433 man->size = p_size;
1434
1435 INIT_LIST_HEAD(&man->lru);
1436
1437 return 0;
1438}
1439EXPORT_SYMBOL(ttm_bo_init_mm);
1440
1441static void ttm_bo_global_kobj_release(struct kobject *kobj)
1442{
1443 struct ttm_bo_global *glob =
1444 container_of(kobj, struct ttm_bo_global, kobj);
1445
1446 ttm_mem_unregister_shrink(glob->mem_glob, &glob->shrink);
1447 __free_page(glob->dummy_read_page);
1448 kfree(glob);
1449}
1450
1451void ttm_bo_global_release(struct drm_global_reference *ref)
1452{
1453 struct ttm_bo_global *glob = ref->object;
1454
1455 kobject_del(&glob->kobj);
1456 kobject_put(&glob->kobj);
1457}
1458EXPORT_SYMBOL(ttm_bo_global_release);
1459
1460int ttm_bo_global_init(struct drm_global_reference *ref)
1461{
1462 struct ttm_bo_global_ref *bo_ref =
1463 container_of(ref, struct ttm_bo_global_ref, ref);
1464 struct ttm_bo_global *glob = ref->object;
1465 int ret;
1466
1467 mutex_init(&glob->device_list_mutex);
1468 spin_lock_init(&glob->lru_lock);
1469 glob->mem_glob = bo_ref->mem_glob;
1470 glob->dummy_read_page = alloc_page(__GFP_ZERO | GFP_DMA32);
1471
1472 if (unlikely(glob->dummy_read_page == NULL)) {
1473 ret = -ENOMEM;
1474 goto out_no_drp;
1475 }
1476
1477 INIT_LIST_HEAD(&glob->swap_lru);
1478 INIT_LIST_HEAD(&glob->device_list);
1479
1480 ttm_mem_init_shrink(&glob->shrink, ttm_bo_swapout);
1481 ret = ttm_mem_register_shrink(glob->mem_glob, &glob->shrink);
1482 if (unlikely(ret != 0)) {
1483 pr_err("Could not register buffer object swapout\n");
1484 goto out_no_shrink;
1485 }
1486
1487 atomic_set(&glob->bo_count, 0);
1488
1489 ret = kobject_init_and_add(
1490 &glob->kobj, &ttm_bo_glob_kobj_type, ttm_get_kobj(), "buffer_objects");
1491 if (unlikely(ret != 0))
1492 kobject_put(&glob->kobj);
1493 return ret;
1494out_no_shrink:
1495 __free_page(glob->dummy_read_page);
1496out_no_drp:
1497 kfree(glob);
1498 return ret;
1499}
1500EXPORT_SYMBOL(ttm_bo_global_init);
1501
1502
1503int ttm_bo_device_release(struct ttm_bo_device *bdev)
1504{
1505 int ret = 0;
1506 unsigned i = TTM_NUM_MEM_TYPES;
1507 struct ttm_mem_type_manager *man;
1508 struct ttm_bo_global *glob = bdev->glob;
1509
1510 while (i--) {
1511 man = &bdev->man[i];
1512 if (man->has_type) {
1513 man->use_type = false;
1514 if ((i != TTM_PL_SYSTEM) && ttm_bo_clean_mm(bdev, i)) {
1515 ret = -EBUSY;
1516 pr_err("DRM memory manager type %d is not clean\n",
1517 i);
1518 }
1519 man->has_type = false;
1520 }
1521 }
1522
1523 mutex_lock(&glob->device_list_mutex);
1524 list_del(&bdev->device_list);
1525 mutex_unlock(&glob->device_list_mutex);
1526
1527 cancel_delayed_work_sync(&bdev->wq);
1528
1529 while (ttm_bo_delayed_delete(bdev, true))
1530 ;
1531
1532 spin_lock(&glob->lru_lock);
1533 if (list_empty(&bdev->ddestroy))
1534 TTM_DEBUG("Delayed destroy list was clean\n");
1535
1536 if (list_empty(&bdev->man[0].lru))
1537 TTM_DEBUG("Swap list was clean\n");
1538 spin_unlock(&glob->lru_lock);
1539
1540 BUG_ON(!drm_mm_clean(&bdev->addr_space_mm));
1541 write_lock(&bdev->vm_lock);
1542 drm_mm_takedown(&bdev->addr_space_mm);
1543 write_unlock(&bdev->vm_lock);
1544
1545 return ret;
1546}
1547EXPORT_SYMBOL(ttm_bo_device_release);
1548
1549int ttm_bo_device_init(struct ttm_bo_device *bdev,
1550 struct ttm_bo_global *glob,
1551 struct ttm_bo_driver *driver,
1552 uint64_t file_page_offset,
1553 bool need_dma32)
1554{
1555 int ret = -EINVAL;
1556
1557 rwlock_init(&bdev->vm_lock);
1558 bdev->driver = driver;
1559
1560 memset(bdev->man, 0, sizeof(bdev->man));
1561
1562 /*
1563 * Initialize the system memory buffer type.
1564 * Other types need to be driver / IOCTL initialized.
1565 */
1566 ret = ttm_bo_init_mm(bdev, TTM_PL_SYSTEM, 0);
1567 if (unlikely(ret != 0))
1568 goto out_no_sys;
1569
1570 bdev->addr_space_rb = RB_ROOT;
1571 ret = drm_mm_init(&bdev->addr_space_mm, file_page_offset, 0x10000000);
1572 if (unlikely(ret != 0))
1573 goto out_no_addr_mm;
1574
1575 INIT_DELAYED_WORK(&bdev->wq, ttm_bo_delayed_workqueue);
1576 bdev->nice_mode = true;
1577 INIT_LIST_HEAD(&bdev->ddestroy);
1578 bdev->dev_mapping = NULL;
1579 bdev->glob = glob;
1580 bdev->need_dma32 = need_dma32;
1581 bdev->val_seq = 0;
1582 spin_lock_init(&bdev->fence_lock);
1583 mutex_lock(&glob->device_list_mutex);
1584 list_add_tail(&bdev->device_list, &glob->device_list);
1585 mutex_unlock(&glob->device_list_mutex);
1586
1587 return 0;
1588out_no_addr_mm:
1589 ttm_bo_clean_mm(bdev, 0);
1590out_no_sys:
1591 return ret;
1592}
1593EXPORT_SYMBOL(ttm_bo_device_init);
1594
1595/*
1596 * buffer object vm functions.
1597 */
1598
1599bool ttm_mem_reg_is_pci(struct ttm_bo_device *bdev, struct ttm_mem_reg *mem)
1600{
1601 struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
1602
1603 if (!(man->flags & TTM_MEMTYPE_FLAG_FIXED)) {
1604 if (mem->mem_type == TTM_PL_SYSTEM)
1605 return false;
1606
1607 if (man->flags & TTM_MEMTYPE_FLAG_CMA)
1608 return false;
1609
1610 if (mem->placement & TTM_PL_FLAG_CACHED)
1611 return false;
1612 }
1613 return true;
1614}
1615
1616void ttm_bo_unmap_virtual_locked(struct ttm_buffer_object *bo)
1617{
1618 struct ttm_bo_device *bdev = bo->bdev;
1619 loff_t offset = (loff_t) bo->addr_space_offset;
1620 loff_t holelen = ((loff_t) bo->mem.num_pages) << PAGE_SHIFT;
1621
1622 if (!bdev->dev_mapping)
1623 return;
1624 unmap_mapping_range(bdev->dev_mapping, offset, holelen, 1);
1625 ttm_mem_io_free_vm(bo);
1626}
1627
1628void ttm_bo_unmap_virtual(struct ttm_buffer_object *bo)
1629{
1630 struct ttm_bo_device *bdev = bo->bdev;
1631 struct ttm_mem_type_manager *man = &bdev->man[bo->mem.mem_type];
1632
1633 ttm_mem_io_lock(man, false);
1634 ttm_bo_unmap_virtual_locked(bo);
1635 ttm_mem_io_unlock(man);
1636}
1637
1638
1639EXPORT_SYMBOL(ttm_bo_unmap_virtual);
1640
1641static void ttm_bo_vm_insert_rb(struct ttm_buffer_object *bo)
1642{
1643 struct ttm_bo_device *bdev = bo->bdev;
1644 struct rb_node **cur = &bdev->addr_space_rb.rb_node;
1645 struct rb_node *parent = NULL;
1646 struct ttm_buffer_object *cur_bo;
1647 unsigned long offset = bo->vm_node->start;
1648 unsigned long cur_offset;
1649
1650 while (*cur) {
1651 parent = *cur;
1652 cur_bo = rb_entry(parent, struct ttm_buffer_object, vm_rb);
1653 cur_offset = cur_bo->vm_node->start;
1654 if (offset < cur_offset)
1655 cur = &parent->rb_left;
1656 else if (offset > cur_offset)
1657 cur = &parent->rb_right;
1658 else
1659 BUG();
1660 }
1661
1662 rb_link_node(&bo->vm_rb, parent, cur);
1663 rb_insert_color(&bo->vm_rb, &bdev->addr_space_rb);
1664}
1665
1666/**
1667 * ttm_bo_setup_vm:
1668 *
1669 * @bo: the buffer to allocate address space for
1670 *
1671 * Allocate address space in the drm device so that applications
1672 * can mmap the buffer and access the contents. This only
1673 * applies to ttm_bo_type_device objects as others are not
1674 * placed in the drm device address space.
1675 */
1676
1677static int ttm_bo_setup_vm(struct ttm_buffer_object *bo)
1678{
1679 struct ttm_bo_device *bdev = bo->bdev;
1680 int ret;
1681
1682retry_pre_get:
1683 ret = drm_mm_pre_get(&bdev->addr_space_mm);
1684 if (unlikely(ret != 0))
1685 return ret;
1686
1687 write_lock(&bdev->vm_lock);
1688 bo->vm_node = drm_mm_search_free(&bdev->addr_space_mm,
1689 bo->mem.num_pages, 0, 0);
1690
1691 if (unlikely(bo->vm_node == NULL)) {
1692 ret = -ENOMEM;
1693 goto out_unlock;
1694 }
1695
1696 bo->vm_node = drm_mm_get_block_atomic(bo->vm_node,
1697 bo->mem.num_pages, 0);
1698
1699 if (unlikely(bo->vm_node == NULL)) {
1700 write_unlock(&bdev->vm_lock);
1701 goto retry_pre_get;
1702 }
1703
1704 ttm_bo_vm_insert_rb(bo);
1705 write_unlock(&bdev->vm_lock);
1706 bo->addr_space_offset = ((uint64_t) bo->vm_node->start) << PAGE_SHIFT;
1707
1708 return 0;
1709out_unlock:
1710 write_unlock(&bdev->vm_lock);
1711 return ret;
1712}
1713
1714int ttm_bo_wait(struct ttm_buffer_object *bo,
1715 bool lazy, bool interruptible, bool no_wait)
1716{
1717 struct ttm_bo_driver *driver = bo->bdev->driver;
1718 struct ttm_bo_device *bdev = bo->bdev;
1719 void *sync_obj;
1720 void *sync_obj_arg;
1721 int ret = 0;
1722
1723 if (likely(bo->sync_obj == NULL))
1724 return 0;
1725
1726 while (bo->sync_obj) {
1727
1728 if (driver->sync_obj_signaled(bo->sync_obj, bo->sync_obj_arg)) {
1729 void *tmp_obj = bo->sync_obj;
1730 bo->sync_obj = NULL;
1731 clear_bit(TTM_BO_PRIV_FLAG_MOVING, &bo->priv_flags);
1732 spin_unlock(&bdev->fence_lock);
1733 driver->sync_obj_unref(&tmp_obj);
1734 spin_lock(&bdev->fence_lock);
1735 continue;
1736 }
1737
1738 if (no_wait)
1739 return -EBUSY;
1740
1741 sync_obj = driver->sync_obj_ref(bo->sync_obj);
1742 sync_obj_arg = bo->sync_obj_arg;
1743 spin_unlock(&bdev->fence_lock);
1744 ret = driver->sync_obj_wait(sync_obj, sync_obj_arg,
1745 lazy, interruptible);
1746 if (unlikely(ret != 0)) {
1747 driver->sync_obj_unref(&sync_obj);
1748 spin_lock(&bdev->fence_lock);
1749 return ret;
1750 }
1751 spin_lock(&bdev->fence_lock);
1752 if (likely(bo->sync_obj == sync_obj &&
1753 bo->sync_obj_arg == sync_obj_arg)) {
1754 void *tmp_obj = bo->sync_obj;
1755 bo->sync_obj = NULL;
1756 clear_bit(TTM_BO_PRIV_FLAG_MOVING,
1757 &bo->priv_flags);
1758 spin_unlock(&bdev->fence_lock);
1759 driver->sync_obj_unref(&sync_obj);
1760 driver->sync_obj_unref(&tmp_obj);
1761 spin_lock(&bdev->fence_lock);
1762 } else {
1763 spin_unlock(&bdev->fence_lock);
1764 driver->sync_obj_unref(&sync_obj);
1765 spin_lock(&bdev->fence_lock);
1766 }
1767 }
1768 return 0;
1769}
1770EXPORT_SYMBOL(ttm_bo_wait);
1771
1772int ttm_bo_synccpu_write_grab(struct ttm_buffer_object *bo, bool no_wait)
1773{
1774 struct ttm_bo_device *bdev = bo->bdev;
1775 int ret = 0;
1776
1777 /*
1778 * Using ttm_bo_reserve makes sure the lru lists are updated.
1779 */
1780
1781 ret = ttm_bo_reserve(bo, true, no_wait, false, 0);
1782 if (unlikely(ret != 0))
1783 return ret;
1784 spin_lock(&bdev->fence_lock);
1785 ret = ttm_bo_wait(bo, false, true, no_wait);
1786 spin_unlock(&bdev->fence_lock);
1787 if (likely(ret == 0))
1788 atomic_inc(&bo->cpu_writers);
1789 ttm_bo_unreserve(bo);
1790 return ret;
1791}
1792EXPORT_SYMBOL(ttm_bo_synccpu_write_grab);
1793
1794void ttm_bo_synccpu_write_release(struct ttm_buffer_object *bo)
1795{
1796 if (atomic_dec_and_test(&bo->cpu_writers))
1797 wake_up_all(&bo->event_queue);
1798}
1799EXPORT_SYMBOL(ttm_bo_synccpu_write_release);
1800
1801/**
1802 * A buffer object shrink method that tries to swap out the first
1803 * buffer object on the bo_global::swap_lru list.
1804 */
1805
1806static int ttm_bo_swapout(struct ttm_mem_shrink *shrink)
1807{
1808 struct ttm_bo_global *glob =
1809 container_of(shrink, struct ttm_bo_global, shrink);
1810 struct ttm_buffer_object *bo;
1811 int ret = -EBUSY;
1812 int put_count;
1813 uint32_t swap_placement = (TTM_PL_FLAG_CACHED | TTM_PL_FLAG_SYSTEM);
1814
1815 spin_lock(&glob->lru_lock);
1816 while (ret == -EBUSY) {
1817 if (unlikely(list_empty(&glob->swap_lru))) {
1818 spin_unlock(&glob->lru_lock);
1819 return -EBUSY;
1820 }
1821
1822 bo = list_first_entry(&glob->swap_lru,
1823 struct ttm_buffer_object, swap);
1824 kref_get(&bo->list_kref);
1825
1826 if (!list_empty(&bo->ddestroy)) {
1827 spin_unlock(&glob->lru_lock);
1828 (void) ttm_bo_cleanup_refs(bo, false, false, false);
1829 kref_put(&bo->list_kref, ttm_bo_release_list);
1830 spin_lock(&glob->lru_lock);
1831 continue;
1832 }
1833
1834 /**
1835 * Reserve buffer. Since we unlock while sleeping, we need
1836 * to re-check that nobody removed us from the swap-list while
1837 * we slept.
1838 */
1839
1840 ret = ttm_bo_reserve_locked(bo, false, true, false, 0);
1841 if (unlikely(ret == -EBUSY)) {
1842 spin_unlock(&glob->lru_lock);
1843 ttm_bo_wait_unreserved(bo, false);
1844 kref_put(&bo->list_kref, ttm_bo_release_list);
1845 spin_lock(&glob->lru_lock);
1846 }
1847 }
1848
1849 BUG_ON(ret != 0);
1850 put_count = ttm_bo_del_from_lru(bo);
1851 spin_unlock(&glob->lru_lock);
1852
1853 ttm_bo_list_ref_sub(bo, put_count, true);
1854
1855 /**
1856 * Wait for GPU, then move to system cached.
1857 */
1858
1859 spin_lock(&bo->bdev->fence_lock);
1860 ret = ttm_bo_wait(bo, false, false, false);
1861 spin_unlock(&bo->bdev->fence_lock);
1862
1863 if (unlikely(ret != 0))
1864 goto out;
1865
1866 if ((bo->mem.placement & swap_placement) != swap_placement) {
1867 struct ttm_mem_reg evict_mem;
1868
1869 evict_mem = bo->mem;
1870 evict_mem.mm_node = NULL;
1871 evict_mem.placement = TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED;
1872 evict_mem.mem_type = TTM_PL_SYSTEM;
1873
1874 ret = ttm_bo_handle_move_mem(bo, &evict_mem, true,
1875 false, false, false);
1876 if (unlikely(ret != 0))
1877 goto out;
1878 }
1879
1880 ttm_bo_unmap_virtual(bo);
1881
1882 /**
1883 * Swap out. Buffer will be swapped in again as soon as
1884 * anyone tries to access a ttm page.
1885 */
1886
1887 if (bo->bdev->driver->swap_notify)
1888 bo->bdev->driver->swap_notify(bo);
1889
1890 ret = ttm_tt_swapout(bo->ttm, bo->persistent_swap_storage);
1891out:
1892
1893 /**
1894 *
1895 * Unreserve without putting on LRU to avoid swapping out an
1896 * already swapped buffer.
1897 */
1898
1899 atomic_set(&bo->reserved, 0);
1900 wake_up_all(&bo->event_queue);
1901 kref_put(&bo->list_kref, ttm_bo_release_list);
1902 return ret;
1903}
1904
1905void ttm_bo_swapout_all(struct ttm_bo_device *bdev)
1906{
1907 while (ttm_bo_swapout(&bdev->glob->shrink) == 0)
1908 ;
1909}
1910EXPORT_SYMBOL(ttm_bo_swapout_all);