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