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