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