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