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