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 #ifdef __NetBSD__
34 #include <sys/types.h>
35 #include <uvm/uvm_extern.h>
36 #include <uvm/uvm_object.h>
37 #endif
38
39 #include <drm/ttm/ttm_module.h>
40 #include <drm/ttm/ttm_bo_driver.h>
41 #include <drm/ttm/ttm_placement.h>
42 #include <linux/jiffies.h>
43 #include <linux/slab.h>
44 #include <linux/sched.h>
45 #include <linux/mm.h>
46 #include <linux/file.h>
47 #include <linux/module.h>
48 #include <linux/atomic.h>
49 #include <linux/printk.h>
50 #include <linux/export.h>
51
52 #define TTM_ASSERT_LOCKED(param)
53 #define TTM_DEBUG(fmt, arg...) do {} while (0)
54 #define TTM_BO_HASH_ORDER 13
55
56 static int ttm_bo_swapout(struct ttm_mem_shrink *shrink);
57 #ifndef __NetBSD__
58 static void ttm_bo_global_kobj_release(struct kobject *kobj);
59 #endif
60
61 #ifndef __NetBSD__ /* XXX sysfs */
62 static struct attribute ttm_bo_count = {
63 .name = "bo_count",
64 .mode = S_IRUGO
65 };
66 #endif
67
ttm_mem_type_from_flags(uint32_t flags,uint32_t * mem_type)68 static inline int ttm_mem_type_from_flags(uint32_t flags, uint32_t *mem_type)
69 {
70 int i;
71
72 for (i = 0; i <= TTM_PL_PRIV5; i++)
73 if (flags & (1 << i)) {
74 *mem_type = i;
75 return 0;
76 }
77 return -EINVAL;
78 }
79
ttm_mem_type_debug(struct ttm_bo_device * bdev,int mem_type)80 static void ttm_mem_type_debug(struct ttm_bo_device *bdev, int mem_type)
81 {
82 struct ttm_mem_type_manager *man = &bdev->man[mem_type];
83
84 pr_err(" has_type: %d\n", man->has_type);
85 pr_err(" use_type: %d\n", man->use_type);
86 pr_err(" flags: 0x%08X\n", man->flags);
87 pr_err(" gpu_offset: 0x%08lX\n", man->gpu_offset);
88 pr_err(" size: %"PRIu64"\n", man->size);
89 pr_err(" available_caching: 0x%08X\n", man->available_caching);
90 pr_err(" default_caching: 0x%08X\n", man->default_caching);
91 if (mem_type != TTM_PL_SYSTEM)
92 (*man->func->debug)(man, TTM_PFX);
93 }
94
ttm_bo_mem_space_debug(struct ttm_buffer_object * bo,struct ttm_placement * placement)95 static void ttm_bo_mem_space_debug(struct ttm_buffer_object *bo,
96 struct ttm_placement *placement)
97 {
98 int i, ret, mem_type;
99
100 pr_err("No space for %p (%lu pages, %luK, %luM)\n",
101 bo, bo->mem.num_pages, bo->mem.size >> 10,
102 bo->mem.size >> 20);
103 for (i = 0; i < placement->num_placement; i++) {
104 ret = ttm_mem_type_from_flags(placement->placement[i],
105 &mem_type);
106 if (ret)
107 return;
108 pr_err(" placement[%d]=0x%08X (%d)\n",
109 i, placement->placement[i], mem_type);
110 ttm_mem_type_debug(bo->bdev, mem_type);
111 }
112 }
113
114 #ifndef __NetBSD__ /* XXX sysfs */
ttm_bo_global_show(struct kobject * kobj,struct attribute * attr,char * buffer)115 static ssize_t ttm_bo_global_show(struct kobject *kobj,
116 struct attribute *attr,
117 char *buffer)
118 {
119 struct ttm_bo_global *glob =
120 container_of(kobj, struct ttm_bo_global, kobj);
121
122 return snprintf(buffer, PAGE_SIZE, "%lu\n",
123 (unsigned long) atomic_read(&glob->bo_count));
124 }
125
126 static struct attribute *ttm_bo_global_attrs[] = {
127 &ttm_bo_count,
128 NULL
129 };
130
131 static const struct sysfs_ops ttm_bo_global_ops = {
132 .show = &ttm_bo_global_show
133 };
134
135 static struct kobj_type ttm_bo_glob_kobj_type = {
136 .release = &ttm_bo_global_kobj_release,
137 .sysfs_ops = &ttm_bo_global_ops,
138 .default_attrs = ttm_bo_global_attrs
139 };
140 #endif /* __NetBSD__ */
141
142
ttm_bo_type_flags(unsigned type)143 static inline uint32_t ttm_bo_type_flags(unsigned type)
144 {
145 return 1 << (type);
146 }
147
ttm_bo_release_list(struct kref * list_kref)148 static void ttm_bo_release_list(struct kref *list_kref)
149 {
150 struct ttm_buffer_object *bo =
151 container_of(list_kref, struct ttm_buffer_object, list_kref);
152 struct ttm_bo_device *bdev = bo->bdev;
153 size_t acc_size = bo->acc_size;
154
155 BUG_ON(kref_referenced_p(&bo->list_kref));
156 BUG_ON(kref_referenced_p(&bo->kref));
157 BUG_ON(atomic_read(&bo->cpu_writers));
158 BUG_ON(bo->sync_obj != NULL);
159 BUG_ON(bo->mem.mm_node != NULL);
160 BUG_ON(!list_empty(&bo->lru));
161 BUG_ON(!list_empty(&bo->ddestroy));
162
163 if (bo->ttm)
164 ttm_tt_destroy(bo->ttm);
165 atomic_dec(&bo->glob->bo_count);
166 if (bo->resv == &bo->ttm_resv)
167 reservation_object_fini(&bo->ttm_resv);
168 #ifdef __NetBSD__
169 linux_mutex_destroy(&bo->wu_mutex);
170 #else
171 mutex_destroy(&bo->wu_mutex);
172 #endif
173 if (bo->destroy)
174 bo->destroy(bo);
175 else {
176 kfree(bo);
177 }
178 ttm_mem_global_free(bdev->glob->mem_glob, acc_size);
179 }
180
ttm_bo_add_to_lru(struct ttm_buffer_object * bo)181 void ttm_bo_add_to_lru(struct ttm_buffer_object *bo)
182 {
183 struct ttm_bo_device *bdev = bo->bdev;
184 struct ttm_mem_type_manager *man;
185
186 lockdep_assert_held(&bo->resv->lock.base);
187
188 if (!(bo->mem.placement & TTM_PL_FLAG_NO_EVICT)) {
189
190 BUG_ON(!list_empty(&bo->lru));
191
192 man = &bdev->man[bo->mem.mem_type];
193 list_add_tail(&bo->lru, &man->lru);
194 kref_get(&bo->list_kref);
195
196 if (bo->ttm != NULL) {
197 list_add_tail(&bo->swap, &bo->glob->swap_lru);
198 kref_get(&bo->list_kref);
199 }
200 }
201 }
202 EXPORT_SYMBOL(ttm_bo_add_to_lru);
203
ttm_bo_del_from_lru(struct ttm_buffer_object * bo)204 int ttm_bo_del_from_lru(struct ttm_buffer_object *bo)
205 {
206 int put_count = 0;
207
208 if (!list_empty(&bo->swap)) {
209 list_del_init(&bo->swap);
210 ++put_count;
211 }
212 if (!list_empty(&bo->lru)) {
213 list_del_init(&bo->lru);
214 ++put_count;
215 }
216
217 /*
218 * TODO: Add a driver hook to delete from
219 * driver-specific LRU's here.
220 */
221
222 return put_count;
223 }
224
ttm_bo_ref_bug(struct kref * list_kref)225 static void ttm_bo_ref_bug(struct kref *list_kref)
226 {
227 BUG();
228 }
229
ttm_bo_list_ref_sub(struct ttm_buffer_object * bo,int count,bool never_free)230 void ttm_bo_list_ref_sub(struct ttm_buffer_object *bo, int count,
231 bool never_free)
232 {
233 kref_sub(&bo->list_kref, count,
234 (never_free) ? ttm_bo_ref_bug : ttm_bo_release_list);
235 }
236
ttm_bo_del_sub_from_lru(struct ttm_buffer_object * bo)237 void ttm_bo_del_sub_from_lru(struct ttm_buffer_object *bo)
238 {
239 int put_count;
240
241 spin_lock(&bo->glob->lru_lock);
242 put_count = ttm_bo_del_from_lru(bo);
243 spin_unlock(&bo->glob->lru_lock);
244 ttm_bo_list_ref_sub(bo, put_count, true);
245 }
246 EXPORT_SYMBOL(ttm_bo_del_sub_from_lru);
247
248 /*
249 * Call bo->mutex locked.
250 */
ttm_bo_add_ttm(struct ttm_buffer_object * bo,bool zero_alloc)251 static int ttm_bo_add_ttm(struct ttm_buffer_object *bo, bool zero_alloc)
252 {
253 struct ttm_bo_device *bdev = bo->bdev;
254 struct ttm_bo_global *glob = bo->glob;
255 int ret = 0;
256 uint32_t page_flags = 0;
257
258 TTM_ASSERT_LOCKED(&bo->mutex);
259 bo->ttm = NULL;
260
261 if (bdev->need_dma32)
262 page_flags |= TTM_PAGE_FLAG_DMA32;
263
264 switch (bo->type) {
265 case ttm_bo_type_device:
266 if (zero_alloc)
267 page_flags |= TTM_PAGE_FLAG_ZERO_ALLOC;
268 case ttm_bo_type_kernel:
269 bo->ttm = bdev->driver->ttm_tt_create(bdev, bo->num_pages << PAGE_SHIFT,
270 page_flags, glob->dummy_read_page);
271 if (unlikely(bo->ttm == NULL))
272 ret = -ENOMEM;
273 break;
274 case ttm_bo_type_sg:
275 bo->ttm = bdev->driver->ttm_tt_create(bdev, bo->num_pages << PAGE_SHIFT,
276 page_flags | TTM_PAGE_FLAG_SG,
277 glob->dummy_read_page);
278 if (unlikely(bo->ttm == NULL)) {
279 ret = -ENOMEM;
280 break;
281 }
282 bo->ttm->sg = bo->sg;
283 break;
284 default:
285 pr_err("Illegal buffer object type\n");
286 ret = -EINVAL;
287 break;
288 }
289
290 #ifdef __NetBSD__
291 if (ret)
292 return ret;
293
294 /*
295 * XXX This is gross. We ought to do it the other way around:
296 * set the uao to have the main uvm object's lock. However,
297 * uvm_obj_setlock is not safe on uvm_aobjs.
298 */
299 mutex_obj_hold(bo->ttm->swap_storage->vmobjlock);
300 uvm_obj_setlock(&bo->uvmobj, bo->ttm->swap_storage->vmobjlock);
301 return 0;
302 #else
303 return ret;
304 #endif
305 }
306
ttm_bo_handle_move_mem(struct ttm_buffer_object * bo,struct ttm_mem_reg * mem,bool evict,bool interruptible,bool no_wait_gpu)307 static int ttm_bo_handle_move_mem(struct ttm_buffer_object *bo,
308 struct ttm_mem_reg *mem,
309 bool evict, bool interruptible,
310 bool no_wait_gpu)
311 {
312 struct ttm_bo_device *bdev = bo->bdev;
313 bool old_is_pci = ttm_mem_reg_is_pci(bdev, &bo->mem);
314 bool new_is_pci = ttm_mem_reg_is_pci(bdev, mem);
315 struct ttm_mem_type_manager *old_man = &bdev->man[bo->mem.mem_type];
316 struct ttm_mem_type_manager *new_man = &bdev->man[mem->mem_type];
317 int ret = 0;
318
319 if (old_is_pci || new_is_pci ||
320 ((mem->placement & bo->mem.placement & TTM_PL_MASK_CACHING) == 0)) {
321 ret = ttm_mem_io_lock(old_man, true);
322 if (unlikely(ret != 0))
323 goto out_err;
324 ttm_bo_unmap_virtual_locked(bo);
325 ttm_mem_io_unlock(old_man);
326 }
327
328 /*
329 * Create and bind a ttm if required.
330 */
331
332 if (!(new_man->flags & TTM_MEMTYPE_FLAG_FIXED)) {
333 if (bo->ttm == NULL) {
334 bool zero = !(old_man->flags & TTM_MEMTYPE_FLAG_FIXED);
335 ret = ttm_bo_add_ttm(bo, zero);
336 if (ret)
337 goto out_err;
338 }
339
340 ret = ttm_tt_set_placement_caching(bo->ttm, mem->placement);
341 if (ret)
342 goto out_err;
343
344 if (mem->mem_type != TTM_PL_SYSTEM) {
345 ret = ttm_tt_bind(bo->ttm, mem);
346 if (ret)
347 goto out_err;
348 }
349
350 if (bo->mem.mem_type == TTM_PL_SYSTEM) {
351 if (bdev->driver->move_notify)
352 bdev->driver->move_notify(bo, mem);
353 bo->mem = *mem;
354 mem->mm_node = NULL;
355 goto moved;
356 }
357 }
358
359 if (bdev->driver->move_notify)
360 bdev->driver->move_notify(bo, mem);
361
362 if (!(old_man->flags & TTM_MEMTYPE_FLAG_FIXED) &&
363 !(new_man->flags & TTM_MEMTYPE_FLAG_FIXED))
364 ret = ttm_bo_move_ttm(bo, evict, no_wait_gpu, mem);
365 else if (bdev->driver->move)
366 ret = bdev->driver->move(bo, evict, interruptible,
367 no_wait_gpu, mem);
368 else
369 ret = ttm_bo_move_memcpy(bo, evict, no_wait_gpu, mem);
370
371 if (ret) {
372 if (bdev->driver->move_notify) {
373 struct ttm_mem_reg tmp_mem = *mem;
374 *mem = bo->mem;
375 bo->mem = tmp_mem;
376 bdev->driver->move_notify(bo, mem);
377 bo->mem = *mem;
378 *mem = tmp_mem;
379 }
380
381 goto out_err;
382 }
383
384 moved:
385 if (bo->evicted) {
386 if (bdev->driver->invalidate_caches) {
387 ret = bdev->driver->invalidate_caches(bdev, bo->mem.placement);
388 if (ret)
389 pr_err("Can not flush read caches\n");
390 }
391 bo->evicted = false;
392 }
393
394 if (bo->mem.mm_node) {
395 bo->offset = (bo->mem.start << PAGE_SHIFT) +
396 bdev->man[bo->mem.mem_type].gpu_offset;
397 bo->cur_placement = bo->mem.placement;
398 } else
399 bo->offset = 0;
400
401 return 0;
402
403 out_err:
404 new_man = &bdev->man[bo->mem.mem_type];
405 if ((new_man->flags & TTM_MEMTYPE_FLAG_FIXED) && bo->ttm) {
406 ttm_tt_unbind(bo->ttm);
407 ttm_tt_destroy(bo->ttm);
408 bo->ttm = NULL;
409 }
410
411 return ret;
412 }
413
414 /**
415 * Call bo::reserved.
416 * Will release GPU memory type usage on destruction.
417 * This is the place to put in driver specific hooks to release
418 * driver private resources.
419 * Will release the bo::reserved lock.
420 */
421
ttm_bo_cleanup_memtype_use(struct ttm_buffer_object * bo)422 static void ttm_bo_cleanup_memtype_use(struct ttm_buffer_object *bo)
423 {
424 if (bo->bdev->driver->move_notify)
425 bo->bdev->driver->move_notify(bo, NULL);
426
427 if (bo->ttm) {
428 ttm_tt_unbind(bo->ttm);
429 ttm_tt_destroy(bo->ttm);
430 bo->ttm = NULL;
431 }
432 ttm_bo_mem_put(bo, &bo->mem);
433
434 ww_mutex_unlock (&bo->resv->lock);
435 }
436
ttm_bo_cleanup_refs_or_queue(struct ttm_buffer_object * bo)437 static void ttm_bo_cleanup_refs_or_queue(struct ttm_buffer_object *bo)
438 {
439 struct ttm_bo_device *bdev = bo->bdev;
440 struct ttm_bo_global *glob = bo->glob;
441 struct ttm_bo_driver *driver = bdev->driver;
442 void *sync_obj = NULL;
443 int put_count;
444 int ret;
445
446 spin_lock(&glob->lru_lock);
447 ret = __ttm_bo_reserve(bo, false, true, false, 0);
448
449 spin_lock(&bdev->fence_lock);
450 (void) ttm_bo_wait(bo, false, false, true);
451 if (!ret && !bo->sync_obj) {
452 spin_unlock(&bdev->fence_lock);
453 put_count = ttm_bo_del_from_lru(bo);
454
455 spin_unlock(&glob->lru_lock);
456 ttm_bo_cleanup_memtype_use(bo);
457
458 ttm_bo_list_ref_sub(bo, put_count, true);
459
460 return;
461 }
462 if (bo->sync_obj)
463 sync_obj = driver->sync_obj_ref(bo->sync_obj);
464 spin_unlock(&bdev->fence_lock);
465
466 if (!ret) {
467
468 /*
469 * Make NO_EVICT bos immediately available to
470 * shrinkers, now that they are queued for
471 * destruction.
472 */
473 if (bo->mem.placement & TTM_PL_FLAG_NO_EVICT) {
474 bo->mem.placement &= ~TTM_PL_FLAG_NO_EVICT;
475 ttm_bo_add_to_lru(bo);
476 }
477
478 __ttm_bo_unreserve(bo);
479 }
480
481 kref_get(&bo->list_kref);
482 list_add_tail(&bo->ddestroy, &bdev->ddestroy);
483 spin_unlock(&glob->lru_lock);
484
485 if (sync_obj) {
486 driver->sync_obj_flush(sync_obj);
487 driver->sync_obj_unref(&sync_obj);
488 }
489 schedule_delayed_work(&bdev->wq,
490 ((DRM_HZ / 100) < 1) ? 1 : DRM_HZ / 100);
491 }
492
493 /**
494 * function ttm_bo_cleanup_refs_and_unlock
495 * If bo idle, remove from delayed- and lru lists, and unref.
496 * If not idle, do nothing.
497 *
498 * Must be called with lru_lock and reservation held, this function
499 * will drop both before returning.
500 *
501 * @interruptible Any sleeps should occur interruptibly.
502 * @no_wait_gpu Never wait for gpu. Return -EBUSY instead.
503 */
504
ttm_bo_cleanup_refs_and_unlock(struct ttm_buffer_object * bo,bool interruptible,bool no_wait_gpu)505 static int ttm_bo_cleanup_refs_and_unlock(struct ttm_buffer_object *bo,
506 bool interruptible,
507 bool no_wait_gpu)
508 {
509 struct ttm_bo_device *bdev = bo->bdev;
510 struct ttm_bo_driver *driver = bdev->driver;
511 struct ttm_bo_global *glob = bo->glob;
512 int put_count;
513 int ret;
514
515 spin_lock(&bdev->fence_lock);
516 ret = ttm_bo_wait(bo, false, false, true);
517
518 if (ret && !no_wait_gpu) {
519 void *sync_obj;
520
521 /*
522 * Take a reference to the fence and unreserve,
523 * at this point the buffer should be dead, so
524 * no new sync objects can be attached.
525 */
526 sync_obj = driver->sync_obj_ref(bo->sync_obj);
527 spin_unlock(&bdev->fence_lock);
528
529 __ttm_bo_unreserve(bo);
530 spin_unlock(&glob->lru_lock);
531
532 ret = driver->sync_obj_wait(sync_obj, false, interruptible);
533 driver->sync_obj_unref(&sync_obj);
534 if (ret)
535 return ret;
536
537 /*
538 * remove sync_obj with ttm_bo_wait, the wait should be
539 * finished, and no new wait object should have been added.
540 */
541 spin_lock(&bdev->fence_lock);
542 ret = ttm_bo_wait(bo, false, false, true);
543 WARN_ON(ret);
544 spin_unlock(&bdev->fence_lock);
545 if (ret)
546 return ret;
547
548 spin_lock(&glob->lru_lock);
549 ret = __ttm_bo_reserve(bo, false, true, false, 0);
550
551 /*
552 * We raced, and lost, someone else holds the reservation now,
553 * and is probably busy in ttm_bo_cleanup_memtype_use.
554 *
555 * Even if it's not the case, because we finished waiting any
556 * delayed destruction would succeed, so just return success
557 * here.
558 */
559 if (ret) {
560 spin_unlock(&glob->lru_lock);
561 return 0;
562 }
563 } else
564 spin_unlock(&bdev->fence_lock);
565
566 if (ret || unlikely(list_empty(&bo->ddestroy))) {
567 __ttm_bo_unreserve(bo);
568 spin_unlock(&glob->lru_lock);
569 return ret;
570 }
571
572 put_count = ttm_bo_del_from_lru(bo);
573 list_del_init(&bo->ddestroy);
574 ++put_count;
575
576 spin_unlock(&glob->lru_lock);
577 ttm_bo_cleanup_memtype_use(bo);
578
579 ttm_bo_list_ref_sub(bo, put_count, true);
580
581 return 0;
582 }
583
584 /**
585 * Traverse the delayed list, and call ttm_bo_cleanup_refs on all
586 * encountered buffers.
587 */
588
ttm_bo_delayed_delete(struct ttm_bo_device * bdev,bool remove_all)589 static int ttm_bo_delayed_delete(struct ttm_bo_device *bdev, bool remove_all)
590 {
591 struct ttm_bo_global *glob = bdev->glob;
592 struct ttm_buffer_object *entry = NULL;
593 int ret = 0;
594
595 spin_lock(&glob->lru_lock);
596 if (list_empty(&bdev->ddestroy))
597 goto out_unlock;
598
599 entry = list_first_entry(&bdev->ddestroy,
600 struct ttm_buffer_object, ddestroy);
601 kref_get(&entry->list_kref);
602
603 for (;;) {
604 struct ttm_buffer_object *nentry = NULL;
605
606 if (entry->ddestroy.next != &bdev->ddestroy) {
607 nentry = list_first_entry(&entry->ddestroy,
608 struct ttm_buffer_object, ddestroy);
609 kref_get(&nentry->list_kref);
610 }
611
612 ret = __ttm_bo_reserve(entry, false, true, false, 0);
613 if (remove_all && ret) {
614 spin_unlock(&glob->lru_lock);
615 ret = __ttm_bo_reserve(entry, false, false,
616 false, 0);
617 spin_lock(&glob->lru_lock);
618 }
619
620 if (!ret)
621 ret = ttm_bo_cleanup_refs_and_unlock(entry, false,
622 !remove_all);
623 else
624 spin_unlock(&glob->lru_lock);
625
626 kref_put(&entry->list_kref, ttm_bo_release_list);
627 entry = nentry;
628
629 if (ret || !entry)
630 goto out;
631
632 spin_lock(&glob->lru_lock);
633 if (list_empty(&entry->ddestroy))
634 break;
635 }
636
637 out_unlock:
638 spin_unlock(&glob->lru_lock);
639 out:
640 if (entry)
641 kref_put(&entry->list_kref, ttm_bo_release_list);
642 return ret;
643 }
644
ttm_bo_delayed_workqueue(struct work_struct * work)645 static void ttm_bo_delayed_workqueue(struct work_struct *work)
646 {
647 struct ttm_bo_device *bdev =
648 container_of(work, struct ttm_bo_device, wq.work);
649
650 if (ttm_bo_delayed_delete(bdev, false)) {
651 schedule_delayed_work(&bdev->wq,
652 ((DRM_HZ / 100) < 1) ? 1 : DRM_HZ / 100);
653 }
654 }
655
ttm_bo_release(struct kref * kref)656 static void ttm_bo_release(struct kref *kref)
657 {
658 struct ttm_buffer_object *bo =
659 container_of(kref, struct ttm_buffer_object, kref);
660 struct ttm_bo_device *bdev = bo->bdev;
661 struct ttm_mem_type_manager *man = &bdev->man[bo->mem.mem_type];
662
663 #ifdef __NetBSD__
664 uvm_obj_destroy(&bo->uvmobj, true);
665 #endif
666 drm_vma_offset_remove(&bdev->vma_manager, &bo->vma_node);
667 #ifdef __NetBSD__
668 drm_vma_node_destroy(&bo->vma_node);
669 #endif
670 ttm_mem_io_lock(man, false);
671 ttm_mem_io_free_vm(bo);
672 ttm_mem_io_unlock(man);
673 ttm_bo_cleanup_refs_or_queue(bo);
674 kref_put(&bo->list_kref, ttm_bo_release_list);
675 }
676
ttm_bo_unref(struct ttm_buffer_object ** p_bo)677 void ttm_bo_unref(struct ttm_buffer_object **p_bo)
678 {
679 struct ttm_buffer_object *bo = *p_bo;
680
681 *p_bo = NULL;
682 kref_put(&bo->kref, ttm_bo_release);
683 }
684 EXPORT_SYMBOL(ttm_bo_unref);
685
ttm_bo_lock_delayed_workqueue(struct ttm_bo_device * bdev)686 int ttm_bo_lock_delayed_workqueue(struct ttm_bo_device *bdev)
687 {
688 return cancel_delayed_work_sync(&bdev->wq);
689 }
690 EXPORT_SYMBOL(ttm_bo_lock_delayed_workqueue);
691
ttm_bo_unlock_delayed_workqueue(struct ttm_bo_device * bdev,int resched)692 void ttm_bo_unlock_delayed_workqueue(struct ttm_bo_device *bdev, int resched)
693 {
694 if (resched)
695 schedule_delayed_work(&bdev->wq,
696 ((DRM_HZ / 100) < 1) ? 1 : DRM_HZ / 100);
697 }
698 EXPORT_SYMBOL(ttm_bo_unlock_delayed_workqueue);
699
ttm_bo_evict(struct ttm_buffer_object * bo,bool interruptible,bool no_wait_gpu)700 static int ttm_bo_evict(struct ttm_buffer_object *bo, bool interruptible,
701 bool no_wait_gpu)
702 {
703 struct ttm_bo_device *bdev = bo->bdev;
704 struct ttm_mem_reg evict_mem;
705 struct ttm_placement placement;
706 int ret = 0;
707
708 spin_lock(&bdev->fence_lock);
709 ret = ttm_bo_wait(bo, false, interruptible, no_wait_gpu);
710 spin_unlock(&bdev->fence_lock);
711
712 if (unlikely(ret != 0)) {
713 if (ret != -ERESTARTSYS) {
714 pr_err("Failed to expire sync object before buffer eviction\n");
715 }
716 goto out;
717 }
718
719 lockdep_assert_held(&bo->resv->lock.base);
720
721 evict_mem = bo->mem;
722 evict_mem.mm_node = NULL;
723 evict_mem.bus.io_reserved_vm = false;
724 evict_mem.bus.io_reserved_count = 0;
725
726 placement.fpfn = 0;
727 placement.lpfn = 0;
728 placement.num_placement = 0;
729 placement.num_busy_placement = 0;
730 bdev->driver->evict_flags(bo, &placement);
731 ret = ttm_bo_mem_space(bo, &placement, &evict_mem, interruptible,
732 no_wait_gpu);
733 if (ret) {
734 if (ret != -ERESTARTSYS) {
735 pr_err("Failed to find memory space for buffer 0x%p eviction\n",
736 bo);
737 ttm_bo_mem_space_debug(bo, &placement);
738 }
739 goto out;
740 }
741
742 ret = ttm_bo_handle_move_mem(bo, &evict_mem, true, interruptible,
743 no_wait_gpu);
744 if (ret) {
745 if (ret != -ERESTARTSYS)
746 pr_err("Buffer eviction failed\n");
747 ttm_bo_mem_put(bo, &evict_mem);
748 goto out;
749 }
750 bo->evicted = true;
751 out:
752 return ret;
753 }
754
ttm_mem_evict_first(struct ttm_bo_device * bdev,uint32_t mem_type,bool interruptible,bool no_wait_gpu)755 static int ttm_mem_evict_first(struct ttm_bo_device *bdev,
756 uint32_t mem_type,
757 bool interruptible,
758 bool no_wait_gpu)
759 {
760 struct ttm_bo_global *glob = bdev->glob;
761 struct ttm_mem_type_manager *man = &bdev->man[mem_type];
762 struct ttm_buffer_object *bo;
763 int ret = -EBUSY, put_count;
764
765 spin_lock(&glob->lru_lock);
766 list_for_each_entry(bo, &man->lru, lru) {
767 ret = __ttm_bo_reserve(bo, false, true, false, 0);
768 if (!ret)
769 break;
770 }
771
772 if (ret) {
773 spin_unlock(&glob->lru_lock);
774 return ret;
775 }
776
777 kref_get(&bo->list_kref);
778
779 if (!list_empty(&bo->ddestroy)) {
780 ret = ttm_bo_cleanup_refs_and_unlock(bo, interruptible,
781 no_wait_gpu);
782 kref_put(&bo->list_kref, ttm_bo_release_list);
783 return ret;
784 }
785
786 put_count = ttm_bo_del_from_lru(bo);
787 spin_unlock(&glob->lru_lock);
788
789 BUG_ON(ret != 0);
790
791 ttm_bo_list_ref_sub(bo, put_count, true);
792
793 ret = ttm_bo_evict(bo, interruptible, no_wait_gpu);
794 ttm_bo_unreserve(bo);
795
796 kref_put(&bo->list_kref, ttm_bo_release_list);
797 return ret;
798 }
799
ttm_bo_mem_put(struct ttm_buffer_object * bo,struct ttm_mem_reg * mem)800 void ttm_bo_mem_put(struct ttm_buffer_object *bo, struct ttm_mem_reg *mem)
801 {
802 struct ttm_mem_type_manager *man = &bo->bdev->man[mem->mem_type];
803
804 if (mem->mm_node)
805 (*man->func->put_node)(man, mem);
806 }
807 EXPORT_SYMBOL(ttm_bo_mem_put);
808
809 /**
810 * Repeatedly evict memory from the LRU for @mem_type until we create enough
811 * space, or we've evicted everything and there isn't enough space.
812 */
ttm_bo_mem_force_space(struct ttm_buffer_object * bo,uint32_t mem_type,struct ttm_placement * placement,struct ttm_mem_reg * mem,bool interruptible,bool no_wait_gpu)813 static int ttm_bo_mem_force_space(struct ttm_buffer_object *bo,
814 uint32_t mem_type,
815 struct ttm_placement *placement,
816 struct ttm_mem_reg *mem,
817 bool interruptible,
818 bool no_wait_gpu)
819 {
820 struct ttm_bo_device *bdev = bo->bdev;
821 struct ttm_mem_type_manager *man = &bdev->man[mem_type];
822 int ret;
823
824 do {
825 ret = (*man->func->get_node)(man, bo, placement, mem);
826 if (unlikely(ret != 0))
827 return ret;
828 if (mem->mm_node)
829 break;
830 ret = ttm_mem_evict_first(bdev, mem_type,
831 interruptible, no_wait_gpu);
832 if (unlikely(ret != 0))
833 return ret;
834 } while (1);
835 if (mem->mm_node == NULL)
836 return -ENOMEM;
837 mem->mem_type = mem_type;
838 return 0;
839 }
840
ttm_bo_select_caching(struct ttm_mem_type_manager * man,uint32_t cur_placement,uint32_t proposed_placement)841 static uint32_t ttm_bo_select_caching(struct ttm_mem_type_manager *man,
842 uint32_t cur_placement,
843 uint32_t proposed_placement)
844 {
845 uint32_t caching = proposed_placement & TTM_PL_MASK_CACHING;
846 uint32_t result = proposed_placement & ~TTM_PL_MASK_CACHING;
847
848 /**
849 * Keep current caching if possible.
850 */
851
852 if ((cur_placement & caching) != 0)
853 result |= (cur_placement & caching);
854 else if ((man->default_caching & caching) != 0)
855 result |= man->default_caching;
856 else if ((TTM_PL_FLAG_CACHED & caching) != 0)
857 result |= TTM_PL_FLAG_CACHED;
858 else if ((TTM_PL_FLAG_WC & caching) != 0)
859 result |= TTM_PL_FLAG_WC;
860 else if ((TTM_PL_FLAG_UNCACHED & caching) != 0)
861 result |= TTM_PL_FLAG_UNCACHED;
862
863 return result;
864 }
865
ttm_bo_mt_compatible(struct ttm_mem_type_manager * man,uint32_t mem_type,uint32_t proposed_placement,uint32_t * masked_placement)866 static bool ttm_bo_mt_compatible(struct ttm_mem_type_manager *man,
867 uint32_t mem_type,
868 uint32_t proposed_placement,
869 uint32_t *masked_placement)
870 {
871 uint32_t cur_flags = ttm_bo_type_flags(mem_type);
872
873 if ((cur_flags & proposed_placement & TTM_PL_MASK_MEM) == 0)
874 return false;
875
876 if ((proposed_placement & man->available_caching) == 0)
877 return false;
878
879 cur_flags |= (proposed_placement & man->available_caching);
880
881 *masked_placement = cur_flags;
882 return true;
883 }
884
885 /**
886 * Creates space for memory region @mem according to its type.
887 *
888 * This function first searches for free space in compatible memory types in
889 * the priority order defined by the driver. If free space isn't found, then
890 * ttm_bo_mem_force_space is attempted in priority order to evict and find
891 * space.
892 */
ttm_bo_mem_space(struct ttm_buffer_object * bo,struct ttm_placement * placement,struct ttm_mem_reg * mem,bool interruptible,bool no_wait_gpu)893 int ttm_bo_mem_space(struct ttm_buffer_object *bo,
894 struct ttm_placement *placement,
895 struct ttm_mem_reg *mem,
896 bool interruptible,
897 bool no_wait_gpu)
898 {
899 struct ttm_bo_device *bdev = bo->bdev;
900 struct ttm_mem_type_manager *man;
901 uint32_t mem_type = TTM_PL_SYSTEM;
902 uint32_t cur_flags = 0;
903 bool type_found = false;
904 bool type_ok = false;
905 bool has_erestartsys = false;
906 int i, ret;
907
908 mem->mm_node = NULL;
909 for (i = 0; i < placement->num_placement; ++i) {
910 ret = ttm_mem_type_from_flags(placement->placement[i],
911 &mem_type);
912 if (ret)
913 return ret;
914 man = &bdev->man[mem_type];
915
916 type_ok = ttm_bo_mt_compatible(man,
917 mem_type,
918 placement->placement[i],
919 &cur_flags);
920
921 if (!type_ok)
922 continue;
923
924 cur_flags = ttm_bo_select_caching(man, bo->mem.placement,
925 cur_flags);
926 /*
927 * Use the access and other non-mapping-related flag bits from
928 * the memory placement flags to the current flags
929 */
930 ttm_flag_masked(&cur_flags, placement->placement[i],
931 ~TTM_PL_MASK_MEMTYPE);
932
933 if (mem_type == TTM_PL_SYSTEM)
934 break;
935
936 if (man->has_type && man->use_type) {
937 type_found = true;
938 ret = (*man->func->get_node)(man, bo, placement, mem);
939 if (unlikely(ret))
940 return ret;
941 }
942 if (mem->mm_node)
943 break;
944 }
945
946 if ((type_ok && (mem_type == TTM_PL_SYSTEM)) || mem->mm_node) {
947 mem->mem_type = mem_type;
948 mem->placement = cur_flags;
949 return 0;
950 }
951
952 if (!type_found)
953 return -EINVAL;
954
955 for (i = 0; i < placement->num_busy_placement; ++i) {
956 ret = ttm_mem_type_from_flags(placement->busy_placement[i],
957 &mem_type);
958 if (ret)
959 return ret;
960 man = &bdev->man[mem_type];
961 if (!man->has_type)
962 continue;
963 if (!ttm_bo_mt_compatible(man,
964 mem_type,
965 placement->busy_placement[i],
966 &cur_flags))
967 continue;
968
969 cur_flags = ttm_bo_select_caching(man, bo->mem.placement,
970 cur_flags);
971 /*
972 * Use the access and other non-mapping-related flag bits from
973 * the memory placement flags to the current flags
974 */
975 ttm_flag_masked(&cur_flags, placement->busy_placement[i],
976 ~TTM_PL_MASK_MEMTYPE);
977
978
979 if (mem_type == TTM_PL_SYSTEM) {
980 mem->mem_type = mem_type;
981 mem->placement = cur_flags;
982 mem->mm_node = NULL;
983 return 0;
984 }
985
986 ret = ttm_bo_mem_force_space(bo, mem_type, placement, mem,
987 interruptible, no_wait_gpu);
988 if (ret == 0 && mem->mm_node) {
989 mem->placement = cur_flags;
990 return 0;
991 }
992 if (ret == -ERESTARTSYS)
993 has_erestartsys = true;
994 }
995 ret = (has_erestartsys) ? -ERESTARTSYS : -ENOMEM;
996 return ret;
997 }
998 EXPORT_SYMBOL(ttm_bo_mem_space);
999
ttm_bo_move_buffer(struct ttm_buffer_object * bo,struct ttm_placement * placement,bool interruptible,bool no_wait_gpu)1000 static int ttm_bo_move_buffer(struct ttm_buffer_object *bo,
1001 struct ttm_placement *placement,
1002 bool interruptible,
1003 bool no_wait_gpu)
1004 {
1005 int ret = 0;
1006 struct ttm_mem_reg mem;
1007 struct ttm_bo_device *bdev = bo->bdev;
1008
1009 lockdep_assert_held(&bo->resv->lock.base);
1010
1011 /*
1012 * FIXME: It's possible to pipeline buffer moves.
1013 * Have the driver move function wait for idle when necessary,
1014 * instead of doing it here.
1015 */
1016 spin_lock(&bdev->fence_lock);
1017 ret = ttm_bo_wait(bo, false, interruptible, no_wait_gpu);
1018 spin_unlock(&bdev->fence_lock);
1019 if (ret)
1020 return ret;
1021 mem.num_pages = bo->num_pages;
1022 mem.size = mem.num_pages << PAGE_SHIFT;
1023 mem.page_alignment = bo->mem.page_alignment;
1024 mem.bus.is_iomem = false;
1025 mem.bus.io_reserved_vm = false;
1026 mem.bus.io_reserved_count = 0;
1027 /*
1028 * Determine where to move the buffer.
1029 */
1030 ret = ttm_bo_mem_space(bo, placement, &mem,
1031 interruptible, no_wait_gpu);
1032 if (ret)
1033 goto out_unlock;
1034 ret = ttm_bo_handle_move_mem(bo, &mem, false,
1035 interruptible, no_wait_gpu);
1036 out_unlock:
1037 if (ret && mem.mm_node)
1038 ttm_bo_mem_put(bo, &mem);
1039 return ret;
1040 }
1041
ttm_bo_mem_compat(struct ttm_placement * placement,struct ttm_mem_reg * mem,uint32_t * new_flags)1042 static bool ttm_bo_mem_compat(struct ttm_placement *placement,
1043 struct ttm_mem_reg *mem,
1044 uint32_t *new_flags)
1045 {
1046 int i;
1047
1048 if (mem->mm_node && placement->lpfn != 0 &&
1049 (mem->start < placement->fpfn ||
1050 mem->start + mem->num_pages > placement->lpfn))
1051 return false;
1052
1053 for (i = 0; i < placement->num_placement; i++) {
1054 *new_flags = placement->placement[i];
1055 if ((*new_flags & mem->placement & TTM_PL_MASK_CACHING) &&
1056 (*new_flags & mem->placement & TTM_PL_MASK_MEM))
1057 return true;
1058 }
1059
1060 for (i = 0; i < placement->num_busy_placement; i++) {
1061 *new_flags = placement->busy_placement[i];
1062 if ((*new_flags & mem->placement & TTM_PL_MASK_CACHING) &&
1063 (*new_flags & mem->placement & TTM_PL_MASK_MEM))
1064 return true;
1065 }
1066
1067 return false;
1068 }
1069
ttm_bo_validate(struct ttm_buffer_object * bo,struct ttm_placement * placement,bool interruptible,bool no_wait_gpu)1070 int ttm_bo_validate(struct ttm_buffer_object *bo,
1071 struct ttm_placement *placement,
1072 bool interruptible,
1073 bool no_wait_gpu)
1074 {
1075 int ret;
1076 uint32_t new_flags;
1077
1078 lockdep_assert_held(&bo->resv->lock.base);
1079 /* Check that range is valid */
1080 if (placement->lpfn || placement->fpfn)
1081 if (placement->fpfn > placement->lpfn ||
1082 (placement->lpfn - placement->fpfn) < bo->num_pages)
1083 return -EINVAL;
1084 /*
1085 * Check whether we need to move buffer.
1086 */
1087 if (!ttm_bo_mem_compat(placement, &bo->mem, &new_flags)) {
1088 ret = ttm_bo_move_buffer(bo, placement, interruptible,
1089 no_wait_gpu);
1090 if (ret)
1091 return ret;
1092 } else {
1093 /*
1094 * Use the access and other non-mapping-related flag bits from
1095 * the compatible memory placement flags to the active flags
1096 */
1097 ttm_flag_masked(&bo->mem.placement, new_flags,
1098 ~TTM_PL_MASK_MEMTYPE);
1099 }
1100 /*
1101 * We might need to add a TTM.
1102 */
1103 if (bo->mem.mem_type == TTM_PL_SYSTEM && bo->ttm == NULL) {
1104 ret = ttm_bo_add_ttm(bo, true);
1105 if (ret)
1106 return ret;
1107 }
1108 return 0;
1109 }
1110 EXPORT_SYMBOL(ttm_bo_validate);
1111
ttm_bo_check_placement(struct ttm_buffer_object * bo,struct ttm_placement * placement)1112 int ttm_bo_check_placement(struct ttm_buffer_object *bo,
1113 struct ttm_placement *placement)
1114 {
1115 BUG_ON((placement->fpfn || placement->lpfn) &&
1116 (bo->mem.num_pages > (placement->lpfn - placement->fpfn)));
1117
1118 return 0;
1119 }
1120
ttm_bo_init(struct ttm_bo_device * bdev,struct ttm_buffer_object * bo,unsigned long size,enum ttm_bo_type type,struct ttm_placement * placement,uint32_t page_alignment,bool interruptible,struct file * persistent_swap_storage,size_t acc_size,struct sg_table * sg,void (* destroy)(struct ttm_buffer_object *))1121 int ttm_bo_init(struct ttm_bo_device *bdev,
1122 struct ttm_buffer_object *bo,
1123 unsigned long size,
1124 enum ttm_bo_type type,
1125 struct ttm_placement *placement,
1126 uint32_t page_alignment,
1127 bool interruptible,
1128 struct file *persistent_swap_storage,
1129 size_t acc_size,
1130 struct sg_table *sg,
1131 void (*destroy) (struct ttm_buffer_object *))
1132 {
1133 int ret = 0;
1134 unsigned long num_pages;
1135 struct ttm_mem_global *mem_glob = bdev->glob->mem_glob;
1136 bool locked;
1137
1138 ret = ttm_mem_global_alloc(mem_glob, acc_size, false, false);
1139 if (ret) {
1140 pr_err("Out of kernel memory\n");
1141 if (destroy)
1142 (*destroy)(bo);
1143 else
1144 kfree(bo);
1145 return -ENOMEM;
1146 }
1147
1148 num_pages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
1149 if (num_pages == 0) {
1150 pr_err("Illegal buffer object size\n");
1151 if (destroy)
1152 (*destroy)(bo);
1153 else
1154 kfree(bo);
1155 ttm_mem_global_free(mem_glob, acc_size);
1156 return -EINVAL;
1157 }
1158 bo->destroy = destroy;
1159
1160 kref_init(&bo->kref);
1161 kref_init(&bo->list_kref);
1162 atomic_set(&bo->cpu_writers, 0);
1163 INIT_LIST_HEAD(&bo->lru);
1164 INIT_LIST_HEAD(&bo->ddestroy);
1165 INIT_LIST_HEAD(&bo->swap);
1166 INIT_LIST_HEAD(&bo->io_reserve_lru);
1167 #ifdef __NetBSD__
1168 linux_mutex_init(&bo->wu_mutex);
1169 #else
1170 mutex_init(&bo->wu_mutex);
1171 #endif
1172 bo->bdev = bdev;
1173 bo->glob = bdev->glob;
1174 bo->type = type;
1175 bo->num_pages = num_pages;
1176 bo->mem.size = num_pages << PAGE_SHIFT;
1177 bo->mem.mem_type = TTM_PL_SYSTEM;
1178 bo->mem.num_pages = bo->num_pages;
1179 bo->mem.mm_node = NULL;
1180 bo->mem.page_alignment = page_alignment;
1181 bo->mem.bus.io_reserved_vm = false;
1182 bo->mem.bus.io_reserved_count = 0;
1183 bo->priv_flags = 0;
1184 bo->mem.placement = (TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED);
1185 bo->persistent_swap_storage = persistent_swap_storage;
1186 bo->acc_size = acc_size;
1187 bo->sg = sg;
1188 bo->resv = &bo->ttm_resv;
1189 reservation_object_init(bo->resv);
1190 atomic_inc(&bo->glob->bo_count);
1191 #ifdef __NetBSD__
1192 drm_vma_node_init(&bo->vma_node);
1193 uvm_obj_init(&bo->uvmobj, bdev->driver->ttm_uvm_ops, true, 1);
1194 #else
1195 drm_vma_node_reset(&bo->vma_node);
1196 #endif
1197
1198 ret = ttm_bo_check_placement(bo, placement);
1199
1200 /*
1201 * For ttm_bo_type_device buffers, allocate
1202 * address space from the device.
1203 */
1204 if (likely(!ret) &&
1205 (bo->type == ttm_bo_type_device ||
1206 bo->type == ttm_bo_type_sg))
1207 ret = drm_vma_offset_add(&bdev->vma_manager, &bo->vma_node,
1208 bo->mem.num_pages);
1209
1210 locked = ww_mutex_trylock(&bo->resv->lock);
1211 WARN_ON(!locked);
1212
1213 if (likely(!ret))
1214 ret = ttm_bo_validate(bo, placement, interruptible, false);
1215
1216 ttm_bo_unreserve(bo);
1217
1218 if (unlikely(ret))
1219 ttm_bo_unref(&bo);
1220
1221 return ret;
1222 }
1223 EXPORT_SYMBOL(ttm_bo_init);
1224
ttm_bo_acc_size(struct ttm_bo_device * bdev,unsigned long bo_size,unsigned struct_size)1225 size_t ttm_bo_acc_size(struct ttm_bo_device *bdev,
1226 unsigned long bo_size,
1227 unsigned struct_size)
1228 {
1229 unsigned npages = (PAGE_ALIGN(bo_size)) >> PAGE_SHIFT;
1230 size_t size = 0;
1231
1232 size += ttm_round_pot(struct_size);
1233 size += PAGE_ALIGN(npages * sizeof(void *));
1234 size += ttm_round_pot(sizeof(struct ttm_tt));
1235 return size;
1236 }
1237 EXPORT_SYMBOL(ttm_bo_acc_size);
1238
ttm_bo_dma_acc_size(struct ttm_bo_device * bdev,unsigned long bo_size,unsigned struct_size)1239 size_t ttm_bo_dma_acc_size(struct ttm_bo_device *bdev,
1240 unsigned long bo_size,
1241 unsigned struct_size)
1242 {
1243 unsigned npages = (PAGE_ALIGN(bo_size)) >> PAGE_SHIFT;
1244 size_t size = 0;
1245
1246 size += ttm_round_pot(struct_size);
1247 size += PAGE_ALIGN(npages * sizeof(void *));
1248 size += PAGE_ALIGN(npages * sizeof(dma_addr_t));
1249 size += ttm_round_pot(sizeof(struct ttm_dma_tt));
1250 return size;
1251 }
1252 EXPORT_SYMBOL(ttm_bo_dma_acc_size);
1253
ttm_bo_create(struct ttm_bo_device * bdev,unsigned long size,enum ttm_bo_type type,struct ttm_placement * placement,uint32_t page_alignment,bool interruptible,struct file * persistent_swap_storage,struct ttm_buffer_object ** p_bo)1254 int ttm_bo_create(struct ttm_bo_device *bdev,
1255 unsigned long size,
1256 enum ttm_bo_type type,
1257 struct ttm_placement *placement,
1258 uint32_t page_alignment,
1259 bool interruptible,
1260 struct file *persistent_swap_storage,
1261 struct ttm_buffer_object **p_bo)
1262 {
1263 struct ttm_buffer_object *bo;
1264 size_t acc_size;
1265 int ret;
1266
1267 bo = kzalloc(sizeof(*bo), GFP_KERNEL);
1268 if (unlikely(bo == NULL))
1269 return -ENOMEM;
1270
1271 acc_size = ttm_bo_acc_size(bdev, size, sizeof(struct ttm_buffer_object));
1272 ret = ttm_bo_init(bdev, bo, size, type, placement, page_alignment,
1273 interruptible, persistent_swap_storage, acc_size,
1274 NULL, NULL);
1275 if (likely(ret == 0))
1276 *p_bo = bo;
1277
1278 return ret;
1279 }
1280 EXPORT_SYMBOL(ttm_bo_create);
1281
ttm_bo_force_list_clean(struct ttm_bo_device * bdev,unsigned mem_type,bool allow_errors)1282 static int ttm_bo_force_list_clean(struct ttm_bo_device *bdev,
1283 unsigned mem_type, bool allow_errors)
1284 {
1285 struct ttm_mem_type_manager *man = &bdev->man[mem_type];
1286 struct ttm_bo_global *glob = bdev->glob;
1287 int ret;
1288
1289 /*
1290 * Can't use standard list traversal since we're unlocking.
1291 */
1292
1293 spin_lock(&glob->lru_lock);
1294 while (!list_empty(&man->lru)) {
1295 spin_unlock(&glob->lru_lock);
1296 ret = ttm_mem_evict_first(bdev, mem_type, false, false);
1297 if (ret) {
1298 if (allow_errors) {
1299 return ret;
1300 } else {
1301 pr_err("Cleanup eviction failed\n");
1302 }
1303 }
1304 spin_lock(&glob->lru_lock);
1305 }
1306 spin_unlock(&glob->lru_lock);
1307 return 0;
1308 }
1309
ttm_bo_clean_mm(struct ttm_bo_device * bdev,unsigned mem_type)1310 int ttm_bo_clean_mm(struct ttm_bo_device *bdev, unsigned mem_type)
1311 {
1312 struct ttm_mem_type_manager *man;
1313 int ret = -EINVAL;
1314
1315 if (mem_type >= TTM_NUM_MEM_TYPES) {
1316 pr_err("Illegal memory type %d\n", mem_type);
1317 return ret;
1318 }
1319 man = &bdev->man[mem_type];
1320
1321 if (!man->has_type) {
1322 pr_err("Trying to take down uninitialized memory manager type %u\n",
1323 mem_type);
1324 return ret;
1325 }
1326
1327 man->use_type = false;
1328 man->has_type = false;
1329
1330 ret = 0;
1331 if (mem_type > 0) {
1332 ttm_bo_force_list_clean(bdev, mem_type, false);
1333
1334 ret = (*man->func->takedown)(man);
1335 }
1336
1337 #ifdef __NetBSD__
1338 linux_mutex_destroy(&man->io_reserve_mutex);
1339 #else
1340 mutex_destroy(&man->io_reserve_mutex);
1341 #endif
1342
1343 return ret;
1344 }
1345 EXPORT_SYMBOL(ttm_bo_clean_mm);
1346
ttm_bo_evict_mm(struct ttm_bo_device * bdev,unsigned mem_type)1347 int ttm_bo_evict_mm(struct ttm_bo_device *bdev, unsigned mem_type)
1348 {
1349 struct ttm_mem_type_manager *man = &bdev->man[mem_type];
1350
1351 if (mem_type == 0 || mem_type >= TTM_NUM_MEM_TYPES) {
1352 pr_err("Illegal memory manager memory type %u\n", mem_type);
1353 return -EINVAL;
1354 }
1355
1356 if (!man->has_type) {
1357 pr_err("Memory type %u has not been initialized\n", mem_type);
1358 return 0;
1359 }
1360
1361 return ttm_bo_force_list_clean(bdev, mem_type, true);
1362 }
1363 EXPORT_SYMBOL(ttm_bo_evict_mm);
1364
ttm_bo_init_mm(struct ttm_bo_device * bdev,unsigned type,unsigned long p_size)1365 int ttm_bo_init_mm(struct ttm_bo_device *bdev, unsigned type,
1366 unsigned long p_size)
1367 {
1368 int ret = -EINVAL;
1369 struct ttm_mem_type_manager *man;
1370
1371 BUG_ON(type >= TTM_NUM_MEM_TYPES);
1372 man = &bdev->man[type];
1373 BUG_ON(man->has_type);
1374 man->io_reserve_fastpath = true;
1375 man->use_io_reserve_lru = false;
1376 #ifdef __NetBSD__
1377 linux_mutex_init(&man->io_reserve_mutex);
1378 #else
1379 mutex_init(&man->io_reserve_mutex);
1380 #endif
1381 INIT_LIST_HEAD(&man->io_reserve_lru);
1382
1383 ret = bdev->driver->init_mem_type(bdev, type, man);
1384 if (ret)
1385 return ret;
1386 man->bdev = bdev;
1387
1388 ret = 0;
1389 if (type != TTM_PL_SYSTEM) {
1390 ret = (*man->func->init)(man, p_size);
1391 if (ret)
1392 return ret;
1393 }
1394 man->has_type = true;
1395 man->use_type = true;
1396 man->size = p_size;
1397
1398 INIT_LIST_HEAD(&man->lru);
1399
1400 return 0;
1401 }
1402 EXPORT_SYMBOL(ttm_bo_init_mm);
1403
1404 #ifndef __NetBSD__
ttm_bo_global_kobj_release(struct kobject * kobj)1405 static void ttm_bo_global_kobj_release(struct kobject *kobj)
1406 {
1407 struct ttm_bo_global *glob =
1408 container_of(kobj, struct ttm_bo_global, kobj);
1409
1410 ttm_mem_unregister_shrink(glob->mem_glob, &glob->shrink);
1411 __free_page(glob->dummy_read_page);
1412 mutex_destroy(&glob->device_list_mutex);
1413 kfree(glob);
1414 }
1415 #endif
1416
ttm_bo_global_release(struct drm_global_reference * ref)1417 void ttm_bo_global_release(struct drm_global_reference *ref)
1418 {
1419 struct ttm_bo_global *glob = ref->object;
1420
1421 #ifdef __NetBSD__
1422 ttm_mem_unregister_shrink(glob->mem_glob, &glob->shrink);
1423 BUG_ON(glob->dummy_read_page != NULL);
1424 spin_lock_destroy(&glob->lru_lock);
1425 linux_mutex_destroy(&glob->device_list_mutex);
1426 kfree(glob);
1427 #else
1428 kobject_del(&glob->kobj);
1429 kobject_put(&glob->kobj);
1430 #endif
1431 }
1432 EXPORT_SYMBOL(ttm_bo_global_release);
1433
ttm_bo_global_init(struct drm_global_reference * ref)1434 int ttm_bo_global_init(struct drm_global_reference *ref)
1435 {
1436 struct ttm_bo_global_ref *bo_ref =
1437 container_of(ref, struct ttm_bo_global_ref, ref);
1438 struct ttm_bo_global *glob = ref->object;
1439 int ret;
1440
1441 #ifdef __NetBSD__
1442 linux_mutex_init(&glob->device_list_mutex);
1443 #else
1444 mutex_init(&glob->device_list_mutex);
1445 #endif
1446 spin_lock_init(&glob->lru_lock);
1447 glob->mem_glob = bo_ref->mem_glob;
1448 #ifdef __NetBSD__
1449 /* Only used by agp back end, will fix there. */
1450 /* XXX Fix agp back end to DTRT. */
1451 glob->dummy_read_page = NULL;
1452 #else
1453 glob->dummy_read_page = alloc_page(__GFP_ZERO | GFP_DMA32);
1454
1455 if (unlikely(glob->dummy_read_page == NULL)) {
1456 ret = -ENOMEM;
1457 goto out_no_drp;
1458 }
1459 #endif
1460
1461 INIT_LIST_HEAD(&glob->swap_lru);
1462 INIT_LIST_HEAD(&glob->device_list);
1463
1464 ttm_mem_init_shrink(&glob->shrink, ttm_bo_swapout);
1465 ret = ttm_mem_register_shrink(glob->mem_glob, &glob->shrink);
1466 if (unlikely(ret != 0)) {
1467 pr_err("Could not register buffer object swapout\n");
1468 goto out_no_shrink;
1469 }
1470
1471 atomic_set(&glob->bo_count, 0);
1472
1473 #ifdef __NetBSD__
1474 ret = 0;
1475 #else
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 #endif
1481 return ret;
1482 out_no_shrink:
1483 #ifndef __NetBSD__
1484 __free_page(glob->dummy_read_page);
1485 out_no_drp:
1486 #endif
1487 kfree(glob);
1488 return ret;
1489 }
1490 EXPORT_SYMBOL(ttm_bo_global_init);
1491
1492
ttm_bo_device_release(struct ttm_bo_device * bdev)1493 int ttm_bo_device_release(struct ttm_bo_device *bdev)
1494 {
1495 int ret = 0;
1496 unsigned i = TTM_NUM_MEM_TYPES;
1497 struct ttm_mem_type_manager *man;
1498 struct ttm_bo_global *glob = bdev->glob;
1499
1500 while (i--) {
1501 man = &bdev->man[i];
1502 if (man->has_type) {
1503 man->use_type = false;
1504 if ((i != TTM_PL_SYSTEM) && ttm_bo_clean_mm(bdev, i)) {
1505 ret = -EBUSY;
1506 pr_err("DRM memory manager type %d is not clean\n",
1507 i);
1508 }
1509 man->has_type = false;
1510 }
1511 }
1512
1513 mutex_lock(&glob->device_list_mutex);
1514 list_del(&bdev->device_list);
1515 mutex_unlock(&glob->device_list_mutex);
1516
1517 cancel_delayed_work_sync(&bdev->wq);
1518
1519 while (ttm_bo_delayed_delete(bdev, true))
1520 ;
1521
1522 spin_lock(&glob->lru_lock);
1523 if (list_empty(&bdev->ddestroy))
1524 TTM_DEBUG("Delayed destroy list was clean\n");
1525
1526 if (list_empty(&bdev->man[0].lru))
1527 TTM_DEBUG("Swap list was clean\n");
1528 spin_unlock(&glob->lru_lock);
1529
1530 drm_vma_offset_manager_destroy(&bdev->vma_manager);
1531
1532 return ret;
1533 }
1534 EXPORT_SYMBOL(ttm_bo_device_release);
1535
ttm_bo_device_init(struct ttm_bo_device * bdev,struct ttm_bo_global * glob,struct ttm_bo_driver * driver,bus_space_tag_t memt,bus_dma_tag_t dmat,uint64_t file_page_offset,bool need_dma32)1536 int ttm_bo_device_init(struct ttm_bo_device *bdev,
1537 struct ttm_bo_global *glob,
1538 struct ttm_bo_driver *driver,
1539 #ifdef __NetBSD__
1540 bus_space_tag_t memt,
1541 bus_dma_tag_t dmat,
1542 #else
1543 struct address_space *mapping,
1544 #endif
1545 uint64_t file_page_offset,
1546 bool need_dma32)
1547 {
1548 int ret = -EINVAL;
1549
1550 bdev->driver = driver;
1551
1552 memset(bdev->man, 0, sizeof(bdev->man));
1553
1554 /*
1555 * Initialize the system memory buffer type.
1556 * Other types need to be driver / IOCTL initialized.
1557 */
1558 ret = ttm_bo_init_mm(bdev, TTM_PL_SYSTEM, 0);
1559 if (unlikely(ret != 0))
1560 goto out_no_sys;
1561
1562 drm_vma_offset_manager_init(&bdev->vma_manager, file_page_offset,
1563 0x10000000);
1564 INIT_DELAYED_WORK(&bdev->wq, ttm_bo_delayed_workqueue);
1565 INIT_LIST_HEAD(&bdev->ddestroy);
1566 #ifdef __NetBSD__
1567 bdev->memt = memt;
1568 bdev->dmat = dmat;
1569 #else
1570 bdev->dev_mapping = mapping;
1571 #endif
1572 bdev->glob = glob;
1573 bdev->need_dma32 = need_dma32;
1574 bdev->val_seq = 0;
1575 spin_lock_init(&bdev->fence_lock);
1576 mutex_lock(&glob->device_list_mutex);
1577 list_add_tail(&bdev->device_list, &glob->device_list);
1578 mutex_unlock(&glob->device_list_mutex);
1579
1580 return 0;
1581 out_no_sys:
1582 return ret;
1583 }
1584 EXPORT_SYMBOL(ttm_bo_device_init);
1585
1586 /*
1587 * buffer object vm functions.
1588 */
1589
ttm_mem_reg_is_pci(struct ttm_bo_device * bdev,struct ttm_mem_reg * mem)1590 bool ttm_mem_reg_is_pci(struct ttm_bo_device *bdev, struct ttm_mem_reg *mem)
1591 {
1592 struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
1593
1594 if (!(man->flags & TTM_MEMTYPE_FLAG_FIXED)) {
1595 if (mem->mem_type == TTM_PL_SYSTEM)
1596 return false;
1597
1598 if (man->flags & TTM_MEMTYPE_FLAG_CMA)
1599 return false;
1600
1601 if (mem->placement & TTM_PL_FLAG_CACHED)
1602 return false;
1603 }
1604 return true;
1605 }
1606
ttm_bo_unmap_virtual_locked(struct ttm_buffer_object * bo)1607 void ttm_bo_unmap_virtual_locked(struct ttm_buffer_object *bo)
1608 {
1609 #ifndef __NetBSD__
1610 struct ttm_bo_device *bdev = bo->bdev;
1611 #endif
1612
1613 #ifdef __NetBSD__
1614 if (bo->mem.bus.is_iomem) {
1615 paddr_t start, end, pa;
1616
1617 KASSERTMSG((bo->mem.bus.base & (PAGE_SIZE - 1)) == 0,
1618 "bo bus base addr not page-aligned: %lx",
1619 bo->mem.bus.base);
1620 KASSERTMSG((bo->mem.bus.offset & (PAGE_SIZE - 1)) == 0,
1621 "bo bus offset not page-aligned: %lx",
1622 bo->mem.bus.offset);
1623 start = bo->mem.bus.base + bo->mem.bus.offset;
1624 KASSERT((bo->mem.bus.size & (PAGE_SIZE - 1)) == 0);
1625 end = start + bo->mem.bus.size;
1626
1627 for (pa = start; pa < end; pa += PAGE_SIZE)
1628 pmap_pv_protect(pa, VM_PROT_NONE);
1629 } else if (bo->ttm != NULL) {
1630 unsigned i;
1631
1632 mutex_enter(bo->uvmobj.vmobjlock);
1633 for (i = 0; i < bo->ttm->num_pages; i++)
1634 pmap_page_protect(&bo->ttm->pages[i]->p_vmp,
1635 VM_PROT_NONE);
1636 mutex_exit(bo->uvmobj.vmobjlock);
1637 }
1638 #else
1639 drm_vma_node_unmap(&bo->vma_node, bdev->dev_mapping);
1640 #endif
1641 ttm_mem_io_free_vm(bo);
1642 }
1643
ttm_bo_unmap_virtual(struct ttm_buffer_object * bo)1644 void ttm_bo_unmap_virtual(struct ttm_buffer_object *bo)
1645 {
1646 struct ttm_bo_device *bdev = bo->bdev;
1647 struct ttm_mem_type_manager *man = &bdev->man[bo->mem.mem_type];
1648
1649 ttm_mem_io_lock(man, false);
1650 ttm_bo_unmap_virtual_locked(bo);
1651 ttm_mem_io_unlock(man);
1652 }
1653
1654
1655 EXPORT_SYMBOL(ttm_bo_unmap_virtual);
1656
1657
ttm_bo_wait(struct ttm_buffer_object * bo,bool lazy,bool interruptible,bool no_wait)1658 int ttm_bo_wait(struct ttm_buffer_object *bo,
1659 bool lazy, bool interruptible, bool no_wait)
1660 {
1661 struct ttm_bo_driver *driver = bo->bdev->driver;
1662 struct ttm_bo_device *bdev = bo->bdev;
1663 void *sync_obj;
1664 int ret = 0;
1665
1666 if (likely(bo->sync_obj == NULL))
1667 return 0;
1668
1669 while (bo->sync_obj) {
1670
1671 if (driver->sync_obj_signaled(bo->sync_obj)) {
1672 void *tmp_obj = bo->sync_obj;
1673 bo->sync_obj = NULL;
1674 clear_bit(TTM_BO_PRIV_FLAG_MOVING, &bo->priv_flags);
1675 spin_unlock(&bdev->fence_lock);
1676 driver->sync_obj_unref(&tmp_obj);
1677 spin_lock(&bdev->fence_lock);
1678 continue;
1679 }
1680
1681 if (no_wait)
1682 return -EBUSY;
1683
1684 sync_obj = driver->sync_obj_ref(bo->sync_obj);
1685 spin_unlock(&bdev->fence_lock);
1686 ret = driver->sync_obj_wait(sync_obj,
1687 lazy, interruptible);
1688 if (unlikely(ret != 0)) {
1689 driver->sync_obj_unref(&sync_obj);
1690 spin_lock(&bdev->fence_lock);
1691 return ret;
1692 }
1693 spin_lock(&bdev->fence_lock);
1694 if (likely(bo->sync_obj == sync_obj)) {
1695 void *tmp_obj = bo->sync_obj;
1696 bo->sync_obj = NULL;
1697 clear_bit(TTM_BO_PRIV_FLAG_MOVING,
1698 &bo->priv_flags);
1699 spin_unlock(&bdev->fence_lock);
1700 driver->sync_obj_unref(&sync_obj);
1701 driver->sync_obj_unref(&tmp_obj);
1702 spin_lock(&bdev->fence_lock);
1703 } else {
1704 spin_unlock(&bdev->fence_lock);
1705 driver->sync_obj_unref(&sync_obj);
1706 spin_lock(&bdev->fence_lock);
1707 }
1708 }
1709 return 0;
1710 }
1711 EXPORT_SYMBOL(ttm_bo_wait);
1712
ttm_bo_synccpu_write_grab(struct ttm_buffer_object * bo,bool no_wait)1713 int ttm_bo_synccpu_write_grab(struct ttm_buffer_object *bo, bool no_wait)
1714 {
1715 struct ttm_bo_device *bdev = bo->bdev;
1716 int ret = 0;
1717
1718 /*
1719 * Using ttm_bo_reserve makes sure the lru lists are updated.
1720 */
1721
1722 ret = ttm_bo_reserve(bo, true, no_wait, false, 0);
1723 if (unlikely(ret != 0))
1724 return ret;
1725 spin_lock(&bdev->fence_lock);
1726 ret = ttm_bo_wait(bo, false, true, no_wait);
1727 spin_unlock(&bdev->fence_lock);
1728 if (likely(ret == 0))
1729 atomic_inc(&bo->cpu_writers);
1730 ttm_bo_unreserve(bo);
1731 return ret;
1732 }
1733 EXPORT_SYMBOL(ttm_bo_synccpu_write_grab);
1734
ttm_bo_synccpu_write_release(struct ttm_buffer_object * bo)1735 void ttm_bo_synccpu_write_release(struct ttm_buffer_object *bo)
1736 {
1737 atomic_dec(&bo->cpu_writers);
1738 }
1739 EXPORT_SYMBOL(ttm_bo_synccpu_write_release);
1740
1741 /**
1742 * A buffer object shrink method that tries to swap out the first
1743 * buffer object on the bo_global::swap_lru list.
1744 */
1745
ttm_bo_swapout(struct ttm_mem_shrink * shrink)1746 static int ttm_bo_swapout(struct ttm_mem_shrink *shrink)
1747 {
1748 struct ttm_bo_global *glob =
1749 container_of(shrink, struct ttm_bo_global, shrink);
1750 struct ttm_buffer_object *bo;
1751 int ret = -EBUSY;
1752 int put_count;
1753 uint32_t swap_placement = (TTM_PL_FLAG_CACHED | TTM_PL_FLAG_SYSTEM);
1754
1755 spin_lock(&glob->lru_lock);
1756 list_for_each_entry(bo, &glob->swap_lru, swap) {
1757 ret = __ttm_bo_reserve(bo, false, true, false, 0);
1758 if (!ret)
1759 break;
1760 }
1761
1762 if (ret) {
1763 spin_unlock(&glob->lru_lock);
1764 return ret;
1765 }
1766
1767 kref_get(&bo->list_kref);
1768
1769 if (!list_empty(&bo->ddestroy)) {
1770 ret = ttm_bo_cleanup_refs_and_unlock(bo, false, false);
1771 kref_put(&bo->list_kref, ttm_bo_release_list);
1772 return ret;
1773 }
1774
1775 put_count = ttm_bo_del_from_lru(bo);
1776 spin_unlock(&glob->lru_lock);
1777
1778 ttm_bo_list_ref_sub(bo, put_count, true);
1779
1780 /**
1781 * Wait for GPU, then move to system cached.
1782 */
1783
1784 spin_lock(&bo->bdev->fence_lock);
1785 ret = ttm_bo_wait(bo, false, false, false);
1786 spin_unlock(&bo->bdev->fence_lock);
1787
1788 if (unlikely(ret != 0))
1789 goto out;
1790
1791 if ((bo->mem.placement & swap_placement) != swap_placement) {
1792 struct ttm_mem_reg evict_mem;
1793
1794 evict_mem = bo->mem;
1795 evict_mem.mm_node = NULL;
1796 evict_mem.placement = TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED;
1797 evict_mem.mem_type = TTM_PL_SYSTEM;
1798
1799 ret = ttm_bo_handle_move_mem(bo, &evict_mem, true,
1800 false, false);
1801 if (unlikely(ret != 0))
1802 goto out;
1803 }
1804
1805 ttm_bo_unmap_virtual(bo);
1806
1807 /**
1808 * Swap out. Buffer will be swapped in again as soon as
1809 * anyone tries to access a ttm page.
1810 */
1811
1812 if (bo->bdev->driver->swap_notify)
1813 bo->bdev->driver->swap_notify(bo);
1814
1815 ret = ttm_tt_swapout(bo->ttm, bo->persistent_swap_storage);
1816 out:
1817
1818 /**
1819 *
1820 * Unreserve without putting on LRU to avoid swapping out an
1821 * already swapped buffer.
1822 */
1823
1824 __ttm_bo_unreserve(bo);
1825 kref_put(&bo->list_kref, ttm_bo_release_list);
1826 return ret;
1827 }
1828
ttm_bo_swapout_all(struct ttm_bo_device * bdev)1829 void ttm_bo_swapout_all(struct ttm_bo_device *bdev)
1830 {
1831 while (ttm_bo_swapout(&bdev->glob->shrink) == 0)
1832 ;
1833 }
1834 EXPORT_SYMBOL(ttm_bo_swapout_all);
1835
1836 /**
1837 * ttm_bo_wait_unreserved - interruptible wait for a buffer object to become
1838 * unreserved
1839 *
1840 * @bo: Pointer to buffer
1841 */
ttm_bo_wait_unreserved(struct ttm_buffer_object * bo)1842 int ttm_bo_wait_unreserved(struct ttm_buffer_object *bo)
1843 {
1844 int ret;
1845
1846 /*
1847 * In the absense of a wait_unlocked API,
1848 * Use the bo::wu_mutex to avoid triggering livelocks due to
1849 * concurrent use of this function. Note that this use of
1850 * bo::wu_mutex can go away if we change locking order to
1851 * mmap_sem -> bo::reserve.
1852 */
1853 ret = mutex_lock_interruptible(&bo->wu_mutex);
1854 if (unlikely(ret != 0))
1855 return -ERESTARTSYS;
1856 if (!ww_mutex_is_locked(&bo->resv->lock))
1857 goto out_unlock;
1858 ret = __ttm_bo_reserve(bo, true, false, false, NULL);
1859 if (unlikely(ret != 0))
1860 goto out_unlock;
1861 __ttm_bo_unreserve(bo);
1862
1863 out_unlock:
1864 mutex_unlock(&bo->wu_mutex);
1865 return ret;
1866 }
1867