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Merge branch 'x86-apic-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git...
[deliverable/linux.git] / drivers / gpu / drm / ttm / ttm_bo.c
1 /**************************************************************************
2 *
3 * Copyright (c) 2006-2009 VMware, Inc., Palo Alto, CA., USA
4 * All Rights Reserved.
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a
7 * copy of this software and associated documentation files (the
8 * "Software"), to deal in the Software without restriction, including
9 * without limitation the rights to use, copy, modify, merge, publish,
10 * distribute, sub license, and/or sell copies of the Software, and to
11 * permit persons to whom the Software is furnished to do so, subject to
12 * the following conditions:
13 *
14 * The above copyright notice and this permission notice (including the
15 * next paragraph) shall be included in all copies or substantial portions
16 * of the Software.
17 *
18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
19 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
20 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
21 * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
22 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
23 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
24 * USE OR OTHER DEALINGS IN THE SOFTWARE.
25 *
26 **************************************************************************/
27 /*
28 * Authors: Thomas Hellstrom <thellstrom-at-vmware-dot-com>
29 */
30
31 #define pr_fmt(fmt) "[TTM] " fmt
32
33 #include <drm/ttm/ttm_module.h>
34 #include <drm/ttm/ttm_bo_driver.h>
35 #include <drm/ttm/ttm_placement.h>
36 #include <linux/jiffies.h>
37 #include <linux/slab.h>
38 #include <linux/sched.h>
39 #include <linux/mm.h>
40 #include <linux/file.h>
41 #include <linux/module.h>
42 #include <linux/atomic.h>
43
44 #define TTM_ASSERT_LOCKED(param)
45 #define TTM_DEBUG(fmt, arg...)
46 #define TTM_BO_HASH_ORDER 13
47
48 static int ttm_bo_swapout(struct ttm_mem_shrink *shrink);
49 static void ttm_bo_global_kobj_release(struct kobject *kobj);
50
51 static struct attribute ttm_bo_count = {
52 .name = "bo_count",
53 .mode = S_IRUGO
54 };
55
56 static inline int ttm_mem_type_from_flags(uint32_t flags, uint32_t *mem_type)
57 {
58 int i;
59
60 for (i = 0; i <= TTM_PL_PRIV5; i++)
61 if (flags & (1 << i)) {
62 *mem_type = i;
63 return 0;
64 }
65 return -EINVAL;
66 }
67
68 static void ttm_mem_type_debug(struct ttm_bo_device *bdev, int mem_type)
69 {
70 struct ttm_mem_type_manager *man = &bdev->man[mem_type];
71
72 pr_err(" has_type: %d\n", man->has_type);
73 pr_err(" use_type: %d\n", man->use_type);
74 pr_err(" flags: 0x%08X\n", man->flags);
75 pr_err(" gpu_offset: 0x%08lX\n", man->gpu_offset);
76 pr_err(" size: %llu\n", man->size);
77 pr_err(" available_caching: 0x%08X\n", man->available_caching);
78 pr_err(" default_caching: 0x%08X\n", man->default_caching);
79 if (mem_type != TTM_PL_SYSTEM)
80 (*man->func->debug)(man, TTM_PFX);
81 }
82
83 static void ttm_bo_mem_space_debug(struct ttm_buffer_object *bo,
84 struct ttm_placement *placement)
85 {
86 int i, ret, mem_type;
87
88 pr_err("No space for %p (%lu pages, %luK, %luM)\n",
89 bo, bo->mem.num_pages, bo->mem.size >> 10,
90 bo->mem.size >> 20);
91 for (i = 0; i < placement->num_placement; i++) {
92 ret = ttm_mem_type_from_flags(placement->placement[i],
93 &mem_type);
94 if (ret)
95 return;
96 pr_err(" placement[%d]=0x%08X (%d)\n",
97 i, placement->placement[i], mem_type);
98 ttm_mem_type_debug(bo->bdev, mem_type);
99 }
100 }
101
102 static ssize_t ttm_bo_global_show(struct kobject *kobj,
103 struct attribute *attr,
104 char *buffer)
105 {
106 struct ttm_bo_global *glob =
107 container_of(kobj, struct ttm_bo_global, kobj);
108
109 return snprintf(buffer, PAGE_SIZE, "%lu\n",
110 (unsigned long) atomic_read(&glob->bo_count));
111 }
112
113 static struct attribute *ttm_bo_global_attrs[] = {
114 &ttm_bo_count,
115 NULL
116 };
117
118 static const struct sysfs_ops ttm_bo_global_ops = {
119 .show = &ttm_bo_global_show
120 };
121
122 static struct kobj_type ttm_bo_glob_kobj_type = {
123 .release = &ttm_bo_global_kobj_release,
124 .sysfs_ops = &ttm_bo_global_ops,
125 .default_attrs = ttm_bo_global_attrs
126 };
127
128
129 static inline uint32_t ttm_bo_type_flags(unsigned type)
130 {
131 return 1 << (type);
132 }
133
134 static void ttm_bo_release_list(struct kref *list_kref)
135 {
136 struct ttm_buffer_object *bo =
137 container_of(list_kref, struct ttm_buffer_object, list_kref);
138 struct ttm_bo_device *bdev = bo->bdev;
139 size_t acc_size = bo->acc_size;
140
141 BUG_ON(atomic_read(&bo->list_kref.refcount));
142 BUG_ON(atomic_read(&bo->kref.refcount));
143 BUG_ON(atomic_read(&bo->cpu_writers));
144 BUG_ON(bo->sync_obj != NULL);
145 BUG_ON(bo->mem.mm_node != NULL);
146 BUG_ON(!list_empty(&bo->lru));
147 BUG_ON(!list_empty(&bo->ddestroy));
148
149 if (bo->ttm)
150 ttm_tt_destroy(bo->ttm);
151 atomic_dec(&bo->glob->bo_count);
152 if (bo->resv == &bo->ttm_resv)
153 reservation_object_fini(&bo->ttm_resv);
154 mutex_destroy(&bo->wu_mutex);
155 if (bo->destroy)
156 bo->destroy(bo);
157 else {
158 kfree(bo);
159 }
160 ttm_mem_global_free(bdev->glob->mem_glob, acc_size);
161 }
162
163 void ttm_bo_add_to_lru(struct ttm_buffer_object *bo)
164 {
165 struct ttm_bo_device *bdev = bo->bdev;
166 struct ttm_mem_type_manager *man;
167
168 lockdep_assert_held(&bo->resv->lock.base);
169
170 if (!(bo->mem.placement & TTM_PL_FLAG_NO_EVICT)) {
171
172 BUG_ON(!list_empty(&bo->lru));
173
174 man = &bdev->man[bo->mem.mem_type];
175 list_add_tail(&bo->lru, &man->lru);
176 kref_get(&bo->list_kref);
177
178 if (bo->ttm != NULL) {
179 list_add_tail(&bo->swap, &bo->glob->swap_lru);
180 kref_get(&bo->list_kref);
181 }
182 }
183 }
184 EXPORT_SYMBOL(ttm_bo_add_to_lru);
185
186 int ttm_bo_del_from_lru(struct ttm_buffer_object *bo)
187 {
188 int put_count = 0;
189
190 if (!list_empty(&bo->swap)) {
191 list_del_init(&bo->swap);
192 ++put_count;
193 }
194 if (!list_empty(&bo->lru)) {
195 list_del_init(&bo->lru);
196 ++put_count;
197 }
198
199 /*
200 * TODO: Add a driver hook to delete from
201 * driver-specific LRU's here.
202 */
203
204 return put_count;
205 }
206
207 static void ttm_bo_ref_bug(struct kref *list_kref)
208 {
209 BUG();
210 }
211
212 void ttm_bo_list_ref_sub(struct ttm_buffer_object *bo, int count,
213 bool never_free)
214 {
215 kref_sub(&bo->list_kref, count,
216 (never_free) ? ttm_bo_ref_bug : ttm_bo_release_list);
217 }
218
219 void ttm_bo_del_sub_from_lru(struct ttm_buffer_object *bo)
220 {
221 int put_count;
222
223 spin_lock(&bo->glob->lru_lock);
224 put_count = ttm_bo_del_from_lru(bo);
225 spin_unlock(&bo->glob->lru_lock);
226 ttm_bo_list_ref_sub(bo, put_count, true);
227 }
228 EXPORT_SYMBOL(ttm_bo_del_sub_from_lru);
229
230 /*
231 * Call bo->mutex locked.
232 */
233 static int ttm_bo_add_ttm(struct ttm_buffer_object *bo, bool zero_alloc)
234 {
235 struct ttm_bo_device *bdev = bo->bdev;
236 struct ttm_bo_global *glob = bo->glob;
237 int ret = 0;
238 uint32_t page_flags = 0;
239
240 TTM_ASSERT_LOCKED(&bo->mutex);
241 bo->ttm = NULL;
242
243 if (bdev->need_dma32)
244 page_flags |= TTM_PAGE_FLAG_DMA32;
245
246 switch (bo->type) {
247 case ttm_bo_type_device:
248 if (zero_alloc)
249 page_flags |= TTM_PAGE_FLAG_ZERO_ALLOC;
250 case ttm_bo_type_kernel:
251 bo->ttm = bdev->driver->ttm_tt_create(bdev, bo->num_pages << PAGE_SHIFT,
252 page_flags, glob->dummy_read_page);
253 if (unlikely(bo->ttm == NULL))
254 ret = -ENOMEM;
255 break;
256 case ttm_bo_type_sg:
257 bo->ttm = bdev->driver->ttm_tt_create(bdev, bo->num_pages << PAGE_SHIFT,
258 page_flags | TTM_PAGE_FLAG_SG,
259 glob->dummy_read_page);
260 if (unlikely(bo->ttm == NULL)) {
261 ret = -ENOMEM;
262 break;
263 }
264 bo->ttm->sg = bo->sg;
265 break;
266 default:
267 pr_err("Illegal buffer object type\n");
268 ret = -EINVAL;
269 break;
270 }
271
272 return ret;
273 }
274
275 static int ttm_bo_handle_move_mem(struct ttm_buffer_object *bo,
276 struct ttm_mem_reg *mem,
277 bool evict, bool interruptible,
278 bool no_wait_gpu)
279 {
280 struct ttm_bo_device *bdev = bo->bdev;
281 bool old_is_pci = ttm_mem_reg_is_pci(bdev, &bo->mem);
282 bool new_is_pci = ttm_mem_reg_is_pci(bdev, mem);
283 struct ttm_mem_type_manager *old_man = &bdev->man[bo->mem.mem_type];
284 struct ttm_mem_type_manager *new_man = &bdev->man[mem->mem_type];
285 int ret = 0;
286
287 if (old_is_pci || new_is_pci ||
288 ((mem->placement & bo->mem.placement & TTM_PL_MASK_CACHING) == 0)) {
289 ret = ttm_mem_io_lock(old_man, true);
290 if (unlikely(ret != 0))
291 goto out_err;
292 ttm_bo_unmap_virtual_locked(bo);
293 ttm_mem_io_unlock(old_man);
294 }
295
296 /*
297 * Create and bind a ttm if required.
298 */
299
300 if (!(new_man->flags & TTM_MEMTYPE_FLAG_FIXED)) {
301 if (bo->ttm == NULL) {
302 bool zero = !(old_man->flags & TTM_MEMTYPE_FLAG_FIXED);
303 ret = ttm_bo_add_ttm(bo, zero);
304 if (ret)
305 goto out_err;
306 }
307
308 ret = ttm_tt_set_placement_caching(bo->ttm, mem->placement);
309 if (ret)
310 goto out_err;
311
312 if (mem->mem_type != TTM_PL_SYSTEM) {
313 ret = ttm_tt_bind(bo->ttm, mem);
314 if (ret)
315 goto out_err;
316 }
317
318 if (bo->mem.mem_type == TTM_PL_SYSTEM) {
319 if (bdev->driver->move_notify)
320 bdev->driver->move_notify(bo, mem);
321 bo->mem = *mem;
322 mem->mm_node = NULL;
323 goto moved;
324 }
325 }
326
327 if (bdev->driver->move_notify)
328 bdev->driver->move_notify(bo, mem);
329
330 if (!(old_man->flags & TTM_MEMTYPE_FLAG_FIXED) &&
331 !(new_man->flags & TTM_MEMTYPE_FLAG_FIXED))
332 ret = ttm_bo_move_ttm(bo, evict, no_wait_gpu, mem);
333 else if (bdev->driver->move)
334 ret = bdev->driver->move(bo, evict, interruptible,
335 no_wait_gpu, mem);
336 else
337 ret = ttm_bo_move_memcpy(bo, evict, no_wait_gpu, mem);
338
339 if (ret) {
340 if (bdev->driver->move_notify) {
341 struct ttm_mem_reg tmp_mem = *mem;
342 *mem = bo->mem;
343 bo->mem = tmp_mem;
344 bdev->driver->move_notify(bo, mem);
345 bo->mem = *mem;
346 *mem = tmp_mem;
347 }
348
349 goto out_err;
350 }
351
352 moved:
353 if (bo->evicted) {
354 if (bdev->driver->invalidate_caches) {
355 ret = bdev->driver->invalidate_caches(bdev, bo->mem.placement);
356 if (ret)
357 pr_err("Can not flush read caches\n");
358 }
359 bo->evicted = false;
360 }
361
362 if (bo->mem.mm_node) {
363 bo->offset = (bo->mem.start << PAGE_SHIFT) +
364 bdev->man[bo->mem.mem_type].gpu_offset;
365 bo->cur_placement = bo->mem.placement;
366 } else
367 bo->offset = 0;
368
369 return 0;
370
371 out_err:
372 new_man = &bdev->man[bo->mem.mem_type];
373 if ((new_man->flags & TTM_MEMTYPE_FLAG_FIXED) && bo->ttm) {
374 ttm_tt_unbind(bo->ttm);
375 ttm_tt_destroy(bo->ttm);
376 bo->ttm = NULL;
377 }
378
379 return ret;
380 }
381
382 /**
383 * Call bo::reserved.
384 * Will release GPU memory type usage on destruction.
385 * This is the place to put in driver specific hooks to release
386 * driver private resources.
387 * Will release the bo::reserved lock.
388 */
389
390 static void ttm_bo_cleanup_memtype_use(struct ttm_buffer_object *bo)
391 {
392 if (bo->bdev->driver->move_notify)
393 bo->bdev->driver->move_notify(bo, NULL);
394
395 if (bo->ttm) {
396 ttm_tt_unbind(bo->ttm);
397 ttm_tt_destroy(bo->ttm);
398 bo->ttm = NULL;
399 }
400 ttm_bo_mem_put(bo, &bo->mem);
401
402 ww_mutex_unlock (&bo->resv->lock);
403 }
404
405 static void ttm_bo_cleanup_refs_or_queue(struct ttm_buffer_object *bo)
406 {
407 struct ttm_bo_device *bdev = bo->bdev;
408 struct ttm_bo_global *glob = bo->glob;
409 struct ttm_bo_driver *driver = bdev->driver;
410 void *sync_obj = NULL;
411 int put_count;
412 int ret;
413
414 spin_lock(&glob->lru_lock);
415 ret = __ttm_bo_reserve(bo, false, true, false, NULL);
416
417 spin_lock(&bdev->fence_lock);
418 (void) ttm_bo_wait(bo, false, false, true);
419 if (!ret && !bo->sync_obj) {
420 spin_unlock(&bdev->fence_lock);
421 put_count = ttm_bo_del_from_lru(bo);
422
423 spin_unlock(&glob->lru_lock);
424 ttm_bo_cleanup_memtype_use(bo);
425
426 ttm_bo_list_ref_sub(bo, put_count, true);
427
428 return;
429 }
430 if (bo->sync_obj)
431 sync_obj = driver->sync_obj_ref(bo->sync_obj);
432 spin_unlock(&bdev->fence_lock);
433
434 if (!ret) {
435
436 /*
437 * Make NO_EVICT bos immediately available to
438 * shrinkers, now that they are queued for
439 * destruction.
440 */
441 if (bo->mem.placement & TTM_PL_FLAG_NO_EVICT) {
442 bo->mem.placement &= ~TTM_PL_FLAG_NO_EVICT;
443 ttm_bo_add_to_lru(bo);
444 }
445
446 __ttm_bo_unreserve(bo);
447 }
448
449 kref_get(&bo->list_kref);
450 list_add_tail(&bo->ddestroy, &bdev->ddestroy);
451 spin_unlock(&glob->lru_lock);
452
453 if (sync_obj) {
454 driver->sync_obj_flush(sync_obj);
455 driver->sync_obj_unref(&sync_obj);
456 }
457 schedule_delayed_work(&bdev->wq,
458 ((HZ / 100) < 1) ? 1 : HZ / 100);
459 }
460
461 /**
462 * function ttm_bo_cleanup_refs_and_unlock
463 * If bo idle, remove from delayed- and lru lists, and unref.
464 * If not idle, do nothing.
465 *
466 * Must be called with lru_lock and reservation held, this function
467 * will drop both before returning.
468 *
469 * @interruptible Any sleeps should occur interruptibly.
470 * @no_wait_gpu Never wait for gpu. Return -EBUSY instead.
471 */
472
473 static int ttm_bo_cleanup_refs_and_unlock(struct ttm_buffer_object *bo,
474 bool interruptible,
475 bool no_wait_gpu)
476 {
477 struct ttm_bo_device *bdev = bo->bdev;
478 struct ttm_bo_driver *driver = bdev->driver;
479 struct ttm_bo_global *glob = bo->glob;
480 int put_count;
481 int ret;
482
483 spin_lock(&bdev->fence_lock);
484 ret = ttm_bo_wait(bo, false, false, true);
485
486 if (ret && !no_wait_gpu) {
487 void *sync_obj;
488
489 /*
490 * Take a reference to the fence and unreserve,
491 * at this point the buffer should be dead, so
492 * no new sync objects can be attached.
493 */
494 sync_obj = driver->sync_obj_ref(bo->sync_obj);
495 spin_unlock(&bdev->fence_lock);
496
497 __ttm_bo_unreserve(bo);
498 spin_unlock(&glob->lru_lock);
499
500 ret = driver->sync_obj_wait(sync_obj, false, interruptible);
501 driver->sync_obj_unref(&sync_obj);
502 if (ret)
503 return ret;
504
505 /*
506 * remove sync_obj with ttm_bo_wait, the wait should be
507 * finished, and no new wait object should have been added.
508 */
509 spin_lock(&bdev->fence_lock);
510 ret = ttm_bo_wait(bo, false, false, true);
511 WARN_ON(ret);
512 spin_unlock(&bdev->fence_lock);
513 if (ret)
514 return ret;
515
516 spin_lock(&glob->lru_lock);
517 ret = __ttm_bo_reserve(bo, false, true, false, NULL);
518
519 /*
520 * We raced, and lost, someone else holds the reservation now,
521 * and is probably busy in ttm_bo_cleanup_memtype_use.
522 *
523 * Even if it's not the case, because we finished waiting any
524 * delayed destruction would succeed, so just return success
525 * here.
526 */
527 if (ret) {
528 spin_unlock(&glob->lru_lock);
529 return 0;
530 }
531 } else
532 spin_unlock(&bdev->fence_lock);
533
534 if (ret || unlikely(list_empty(&bo->ddestroy))) {
535 __ttm_bo_unreserve(bo);
536 spin_unlock(&glob->lru_lock);
537 return ret;
538 }
539
540 put_count = ttm_bo_del_from_lru(bo);
541 list_del_init(&bo->ddestroy);
542 ++put_count;
543
544 spin_unlock(&glob->lru_lock);
545 ttm_bo_cleanup_memtype_use(bo);
546
547 ttm_bo_list_ref_sub(bo, put_count, true);
548
549 return 0;
550 }
551
552 /**
553 * Traverse the delayed list, and call ttm_bo_cleanup_refs on all
554 * encountered buffers.
555 */
556
557 static int ttm_bo_delayed_delete(struct ttm_bo_device *bdev, bool remove_all)
558 {
559 struct ttm_bo_global *glob = bdev->glob;
560 struct ttm_buffer_object *entry = NULL;
561 int ret = 0;
562
563 spin_lock(&glob->lru_lock);
564 if (list_empty(&bdev->ddestroy))
565 goto out_unlock;
566
567 entry = list_first_entry(&bdev->ddestroy,
568 struct ttm_buffer_object, ddestroy);
569 kref_get(&entry->list_kref);
570
571 for (;;) {
572 struct ttm_buffer_object *nentry = NULL;
573
574 if (entry->ddestroy.next != &bdev->ddestroy) {
575 nentry = list_first_entry(&entry->ddestroy,
576 struct ttm_buffer_object, ddestroy);
577 kref_get(&nentry->list_kref);
578 }
579
580 ret = __ttm_bo_reserve(entry, false, true, false, NULL);
581 if (remove_all && ret) {
582 spin_unlock(&glob->lru_lock);
583 ret = __ttm_bo_reserve(entry, false, false,
584 false, NULL);
585 spin_lock(&glob->lru_lock);
586 }
587
588 if (!ret)
589 ret = ttm_bo_cleanup_refs_and_unlock(entry, false,
590 !remove_all);
591 else
592 spin_unlock(&glob->lru_lock);
593
594 kref_put(&entry->list_kref, ttm_bo_release_list);
595 entry = nentry;
596
597 if (ret || !entry)
598 goto out;
599
600 spin_lock(&glob->lru_lock);
601 if (list_empty(&entry->ddestroy))
602 break;
603 }
604
605 out_unlock:
606 spin_unlock(&glob->lru_lock);
607 out:
608 if (entry)
609 kref_put(&entry->list_kref, ttm_bo_release_list);
610 return ret;
611 }
612
613 static void ttm_bo_delayed_workqueue(struct work_struct *work)
614 {
615 struct ttm_bo_device *bdev =
616 container_of(work, struct ttm_bo_device, wq.work);
617
618 if (ttm_bo_delayed_delete(bdev, false)) {
619 schedule_delayed_work(&bdev->wq,
620 ((HZ / 100) < 1) ? 1 : HZ / 100);
621 }
622 }
623
624 static void ttm_bo_release(struct kref *kref)
625 {
626 struct ttm_buffer_object *bo =
627 container_of(kref, struct ttm_buffer_object, kref);
628 struct ttm_bo_device *bdev = bo->bdev;
629 struct ttm_mem_type_manager *man = &bdev->man[bo->mem.mem_type];
630
631 drm_vma_offset_remove(&bdev->vma_manager, &bo->vma_node);
632 ttm_mem_io_lock(man, false);
633 ttm_mem_io_free_vm(bo);
634 ttm_mem_io_unlock(man);
635 ttm_bo_cleanup_refs_or_queue(bo);
636 kref_put(&bo->list_kref, ttm_bo_release_list);
637 }
638
639 void ttm_bo_unref(struct ttm_buffer_object **p_bo)
640 {
641 struct ttm_buffer_object *bo = *p_bo;
642
643 *p_bo = NULL;
644 kref_put(&bo->kref, ttm_bo_release);
645 }
646 EXPORT_SYMBOL(ttm_bo_unref);
647
648 int ttm_bo_lock_delayed_workqueue(struct ttm_bo_device *bdev)
649 {
650 return cancel_delayed_work_sync(&bdev->wq);
651 }
652 EXPORT_SYMBOL(ttm_bo_lock_delayed_workqueue);
653
654 void ttm_bo_unlock_delayed_workqueue(struct ttm_bo_device *bdev, int resched)
655 {
656 if (resched)
657 schedule_delayed_work(&bdev->wq,
658 ((HZ / 100) < 1) ? 1 : HZ / 100);
659 }
660 EXPORT_SYMBOL(ttm_bo_unlock_delayed_workqueue);
661
662 static int ttm_bo_evict(struct ttm_buffer_object *bo, bool interruptible,
663 bool no_wait_gpu)
664 {
665 struct ttm_bo_device *bdev = bo->bdev;
666 struct ttm_mem_reg evict_mem;
667 struct ttm_placement placement;
668 int ret = 0;
669
670 spin_lock(&bdev->fence_lock);
671 ret = ttm_bo_wait(bo, false, interruptible, no_wait_gpu);
672 spin_unlock(&bdev->fence_lock);
673
674 if (unlikely(ret != 0)) {
675 if (ret != -ERESTARTSYS) {
676 pr_err("Failed to expire sync object before buffer eviction\n");
677 }
678 goto out;
679 }
680
681 lockdep_assert_held(&bo->resv->lock.base);
682
683 evict_mem = bo->mem;
684 evict_mem.mm_node = NULL;
685 evict_mem.bus.io_reserved_vm = false;
686 evict_mem.bus.io_reserved_count = 0;
687
688 placement.fpfn = 0;
689 placement.lpfn = 0;
690 placement.num_placement = 0;
691 placement.num_busy_placement = 0;
692 bdev->driver->evict_flags(bo, &placement);
693 ret = ttm_bo_mem_space(bo, &placement, &evict_mem, interruptible,
694 no_wait_gpu);
695 if (ret) {
696 if (ret != -ERESTARTSYS) {
697 pr_err("Failed to find memory space for buffer 0x%p eviction\n",
698 bo);
699 ttm_bo_mem_space_debug(bo, &placement);
700 }
701 goto out;
702 }
703
704 ret = ttm_bo_handle_move_mem(bo, &evict_mem, true, interruptible,
705 no_wait_gpu);
706 if (ret) {
707 if (ret != -ERESTARTSYS)
708 pr_err("Buffer eviction failed\n");
709 ttm_bo_mem_put(bo, &evict_mem);
710 goto out;
711 }
712 bo->evicted = true;
713 out:
714 return ret;
715 }
716
717 static int ttm_mem_evict_first(struct ttm_bo_device *bdev,
718 uint32_t mem_type,
719 bool interruptible,
720 bool no_wait_gpu)
721 {
722 struct ttm_bo_global *glob = bdev->glob;
723 struct ttm_mem_type_manager *man = &bdev->man[mem_type];
724 struct ttm_buffer_object *bo;
725 int ret = -EBUSY, put_count;
726
727 spin_lock(&glob->lru_lock);
728 list_for_each_entry(bo, &man->lru, lru) {
729 ret = __ttm_bo_reserve(bo, false, true, false, NULL);
730 if (!ret)
731 break;
732 }
733
734 if (ret) {
735 spin_unlock(&glob->lru_lock);
736 return ret;
737 }
738
739 kref_get(&bo->list_kref);
740
741 if (!list_empty(&bo->ddestroy)) {
742 ret = ttm_bo_cleanup_refs_and_unlock(bo, interruptible,
743 no_wait_gpu);
744 kref_put(&bo->list_kref, ttm_bo_release_list);
745 return ret;
746 }
747
748 put_count = ttm_bo_del_from_lru(bo);
749 spin_unlock(&glob->lru_lock);
750
751 BUG_ON(ret != 0);
752
753 ttm_bo_list_ref_sub(bo, put_count, true);
754
755 ret = ttm_bo_evict(bo, interruptible, no_wait_gpu);
756 ttm_bo_unreserve(bo);
757
758 kref_put(&bo->list_kref, ttm_bo_release_list);
759 return ret;
760 }
761
762 void ttm_bo_mem_put(struct ttm_buffer_object *bo, struct ttm_mem_reg *mem)
763 {
764 struct ttm_mem_type_manager *man = &bo->bdev->man[mem->mem_type];
765
766 if (mem->mm_node)
767 (*man->func->put_node)(man, mem);
768 }
769 EXPORT_SYMBOL(ttm_bo_mem_put);
770
771 /**
772 * Repeatedly evict memory from the LRU for @mem_type until we create enough
773 * space, or we've evicted everything and there isn't enough space.
774 */
775 static int ttm_bo_mem_force_space(struct ttm_buffer_object *bo,
776 uint32_t mem_type,
777 struct ttm_placement *placement,
778 struct ttm_mem_reg *mem,
779 bool interruptible,
780 bool no_wait_gpu)
781 {
782 struct ttm_bo_device *bdev = bo->bdev;
783 struct ttm_mem_type_manager *man = &bdev->man[mem_type];
784 int ret;
785
786 do {
787 ret = (*man->func->get_node)(man, bo, placement, 0, mem);
788 if (unlikely(ret != 0))
789 return ret;
790 if (mem->mm_node)
791 break;
792 ret = ttm_mem_evict_first(bdev, mem_type,
793 interruptible, no_wait_gpu);
794 if (unlikely(ret != 0))
795 return ret;
796 } while (1);
797 if (mem->mm_node == NULL)
798 return -ENOMEM;
799 mem->mem_type = mem_type;
800 return 0;
801 }
802
803 static uint32_t ttm_bo_select_caching(struct ttm_mem_type_manager *man,
804 uint32_t cur_placement,
805 uint32_t proposed_placement)
806 {
807 uint32_t caching = proposed_placement & TTM_PL_MASK_CACHING;
808 uint32_t result = proposed_placement & ~TTM_PL_MASK_CACHING;
809
810 /**
811 * Keep current caching if possible.
812 */
813
814 if ((cur_placement & caching) != 0)
815 result |= (cur_placement & caching);
816 else if ((man->default_caching & caching) != 0)
817 result |= man->default_caching;
818 else if ((TTM_PL_FLAG_CACHED & caching) != 0)
819 result |= TTM_PL_FLAG_CACHED;
820 else if ((TTM_PL_FLAG_WC & caching) != 0)
821 result |= TTM_PL_FLAG_WC;
822 else if ((TTM_PL_FLAG_UNCACHED & caching) != 0)
823 result |= TTM_PL_FLAG_UNCACHED;
824
825 return result;
826 }
827
828 static bool ttm_bo_mt_compatible(struct ttm_mem_type_manager *man,
829 uint32_t mem_type,
830 uint32_t proposed_placement,
831 uint32_t *masked_placement)
832 {
833 uint32_t cur_flags = ttm_bo_type_flags(mem_type);
834
835 if ((cur_flags & proposed_placement & TTM_PL_MASK_MEM) == 0)
836 return false;
837
838 if ((proposed_placement & man->available_caching) == 0)
839 return false;
840
841 cur_flags |= (proposed_placement & man->available_caching);
842
843 *masked_placement = cur_flags;
844 return true;
845 }
846
847 /**
848 * Creates space for memory region @mem according to its type.
849 *
850 * This function first searches for free space in compatible memory types in
851 * the priority order defined by the driver. If free space isn't found, then
852 * ttm_bo_mem_force_space is attempted in priority order to evict and find
853 * space.
854 */
855 int ttm_bo_mem_space(struct ttm_buffer_object *bo,
856 struct ttm_placement *placement,
857 struct ttm_mem_reg *mem,
858 bool interruptible,
859 bool no_wait_gpu)
860 {
861 struct ttm_bo_device *bdev = bo->bdev;
862 struct ttm_mem_type_manager *man;
863 uint32_t mem_type = TTM_PL_SYSTEM;
864 uint32_t cur_flags = 0;
865 bool type_found = false;
866 bool type_ok = false;
867 bool has_erestartsys = false;
868 int i, ret;
869
870 mem->mm_node = NULL;
871 for (i = 0; i < placement->num_placement; ++i) {
872 ret = ttm_mem_type_from_flags(placement->placement[i],
873 &mem_type);
874 if (ret)
875 return ret;
876 man = &bdev->man[mem_type];
877
878 type_ok = ttm_bo_mt_compatible(man,
879 mem_type,
880 placement->placement[i],
881 &cur_flags);
882
883 if (!type_ok)
884 continue;
885
886 cur_flags = ttm_bo_select_caching(man, bo->mem.placement,
887 cur_flags);
888 /*
889 * Use the access and other non-mapping-related flag bits from
890 * the memory placement flags to the current flags
891 */
892 ttm_flag_masked(&cur_flags, placement->placement[i],
893 ~TTM_PL_MASK_MEMTYPE);
894
895 if (mem_type == TTM_PL_SYSTEM)
896 break;
897
898 if (man->has_type && man->use_type) {
899 type_found = true;
900 ret = (*man->func->get_node)(man, bo, placement,
901 cur_flags, mem);
902 if (unlikely(ret))
903 return ret;
904 }
905 if (mem->mm_node)
906 break;
907 }
908
909 if ((type_ok && (mem_type == TTM_PL_SYSTEM)) || mem->mm_node) {
910 mem->mem_type = mem_type;
911 mem->placement = cur_flags;
912 return 0;
913 }
914
915 if (!type_found)
916 return -EINVAL;
917
918 for (i = 0; i < placement->num_busy_placement; ++i) {
919 ret = ttm_mem_type_from_flags(placement->busy_placement[i],
920 &mem_type);
921 if (ret)
922 return ret;
923 man = &bdev->man[mem_type];
924 if (!man->has_type)
925 continue;
926 if (!ttm_bo_mt_compatible(man,
927 mem_type,
928 placement->busy_placement[i],
929 &cur_flags))
930 continue;
931
932 cur_flags = ttm_bo_select_caching(man, bo->mem.placement,
933 cur_flags);
934 /*
935 * Use the access and other non-mapping-related flag bits from
936 * the memory placement flags to the current flags
937 */
938 ttm_flag_masked(&cur_flags, placement->busy_placement[i],
939 ~TTM_PL_MASK_MEMTYPE);
940
941 if (mem_type == TTM_PL_SYSTEM) {
942 mem->mem_type = mem_type;
943 mem->placement = cur_flags;
944 mem->mm_node = NULL;
945 return 0;
946 }
947
948 ret = ttm_bo_mem_force_space(bo, mem_type, placement, mem,
949 interruptible, no_wait_gpu);
950 if (ret == 0 && mem->mm_node) {
951 mem->placement = cur_flags;
952 return 0;
953 }
954 if (ret == -ERESTARTSYS)
955 has_erestartsys = true;
956 }
957 ret = (has_erestartsys) ? -ERESTARTSYS : -ENOMEM;
958 return ret;
959 }
960 EXPORT_SYMBOL(ttm_bo_mem_space);
961
962 static int ttm_bo_move_buffer(struct ttm_buffer_object *bo,
963 struct ttm_placement *placement,
964 bool interruptible,
965 bool no_wait_gpu)
966 {
967 int ret = 0;
968 struct ttm_mem_reg mem;
969 struct ttm_bo_device *bdev = bo->bdev;
970
971 lockdep_assert_held(&bo->resv->lock.base);
972
973 /*
974 * FIXME: It's possible to pipeline buffer moves.
975 * Have the driver move function wait for idle when necessary,
976 * instead of doing it here.
977 */
978 spin_lock(&bdev->fence_lock);
979 ret = ttm_bo_wait(bo, false, interruptible, no_wait_gpu);
980 spin_unlock(&bdev->fence_lock);
981 if (ret)
982 return ret;
983 mem.num_pages = bo->num_pages;
984 mem.size = mem.num_pages << PAGE_SHIFT;
985 mem.page_alignment = bo->mem.page_alignment;
986 mem.bus.io_reserved_vm = false;
987 mem.bus.io_reserved_count = 0;
988 /*
989 * Determine where to move the buffer.
990 */
991 ret = ttm_bo_mem_space(bo, placement, &mem,
992 interruptible, no_wait_gpu);
993 if (ret)
994 goto out_unlock;
995 ret = ttm_bo_handle_move_mem(bo, &mem, false,
996 interruptible, no_wait_gpu);
997 out_unlock:
998 if (ret && mem.mm_node)
999 ttm_bo_mem_put(bo, &mem);
1000 return ret;
1001 }
1002
1003 static bool ttm_bo_mem_compat(struct ttm_placement *placement,
1004 struct ttm_mem_reg *mem,
1005 uint32_t *new_flags)
1006 {
1007 int i;
1008
1009 if (mem->mm_node && placement->lpfn != 0 &&
1010 (mem->start < placement->fpfn ||
1011 mem->start + mem->num_pages > placement->lpfn))
1012 return false;
1013
1014 for (i = 0; i < placement->num_placement; i++) {
1015 *new_flags = placement->placement[i];
1016 if ((*new_flags & mem->placement & TTM_PL_MASK_CACHING) &&
1017 (*new_flags & mem->placement & TTM_PL_MASK_MEM))
1018 return true;
1019 }
1020
1021 for (i = 0; i < placement->num_busy_placement; i++) {
1022 *new_flags = placement->busy_placement[i];
1023 if ((*new_flags & mem->placement & TTM_PL_MASK_CACHING) &&
1024 (*new_flags & mem->placement & TTM_PL_MASK_MEM))
1025 return true;
1026 }
1027
1028 return false;
1029 }
1030
1031 int ttm_bo_validate(struct ttm_buffer_object *bo,
1032 struct ttm_placement *placement,
1033 bool interruptible,
1034 bool no_wait_gpu)
1035 {
1036 int ret;
1037 uint32_t new_flags;
1038
1039 lockdep_assert_held(&bo->resv->lock.base);
1040 /* Check that range is valid */
1041 if (placement->lpfn || placement->fpfn)
1042 if (placement->fpfn > placement->lpfn ||
1043 (placement->lpfn - placement->fpfn) < bo->num_pages)
1044 return -EINVAL;
1045 /*
1046 * Check whether we need to move buffer.
1047 */
1048 if (!ttm_bo_mem_compat(placement, &bo->mem, &new_flags)) {
1049 ret = ttm_bo_move_buffer(bo, placement, interruptible,
1050 no_wait_gpu);
1051 if (ret)
1052 return ret;
1053 } else {
1054 /*
1055 * Use the access and other non-mapping-related flag bits from
1056 * the compatible memory placement flags to the active flags
1057 */
1058 ttm_flag_masked(&bo->mem.placement, new_flags,
1059 ~TTM_PL_MASK_MEMTYPE);
1060 }
1061 /*
1062 * We might need to add a TTM.
1063 */
1064 if (bo->mem.mem_type == TTM_PL_SYSTEM && bo->ttm == NULL) {
1065 ret = ttm_bo_add_ttm(bo, true);
1066 if (ret)
1067 return ret;
1068 }
1069 return 0;
1070 }
1071 EXPORT_SYMBOL(ttm_bo_validate);
1072
1073 int ttm_bo_check_placement(struct ttm_buffer_object *bo,
1074 struct ttm_placement *placement)
1075 {
1076 BUG_ON((placement->fpfn || placement->lpfn) &&
1077 (bo->mem.num_pages > (placement->lpfn - placement->fpfn)));
1078
1079 return 0;
1080 }
1081
1082 int ttm_bo_init(struct ttm_bo_device *bdev,
1083 struct ttm_buffer_object *bo,
1084 unsigned long size,
1085 enum ttm_bo_type type,
1086 struct ttm_placement *placement,
1087 uint32_t page_alignment,
1088 bool interruptible,
1089 struct file *persistent_swap_storage,
1090 size_t acc_size,
1091 struct sg_table *sg,
1092 void (*destroy) (struct ttm_buffer_object *))
1093 {
1094 int ret = 0;
1095 unsigned long num_pages;
1096 struct ttm_mem_global *mem_glob = bdev->glob->mem_glob;
1097 bool locked;
1098
1099 ret = ttm_mem_global_alloc(mem_glob, acc_size, false, false);
1100 if (ret) {
1101 pr_err("Out of kernel memory\n");
1102 if (destroy)
1103 (*destroy)(bo);
1104 else
1105 kfree(bo);
1106 return -ENOMEM;
1107 }
1108
1109 num_pages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
1110 if (num_pages == 0) {
1111 pr_err("Illegal buffer object size\n");
1112 if (destroy)
1113 (*destroy)(bo);
1114 else
1115 kfree(bo);
1116 ttm_mem_global_free(mem_glob, acc_size);
1117 return -EINVAL;
1118 }
1119 bo->destroy = destroy;
1120
1121 kref_init(&bo->kref);
1122 kref_init(&bo->list_kref);
1123 atomic_set(&bo->cpu_writers, 0);
1124 INIT_LIST_HEAD(&bo->lru);
1125 INIT_LIST_HEAD(&bo->ddestroy);
1126 INIT_LIST_HEAD(&bo->swap);
1127 INIT_LIST_HEAD(&bo->io_reserve_lru);
1128 mutex_init(&bo->wu_mutex);
1129 bo->bdev = bdev;
1130 bo->glob = bdev->glob;
1131 bo->type = type;
1132 bo->num_pages = num_pages;
1133 bo->mem.size = num_pages << PAGE_SHIFT;
1134 bo->mem.mem_type = TTM_PL_SYSTEM;
1135 bo->mem.num_pages = bo->num_pages;
1136 bo->mem.mm_node = NULL;
1137 bo->mem.page_alignment = page_alignment;
1138 bo->mem.bus.io_reserved_vm = false;
1139 bo->mem.bus.io_reserved_count = 0;
1140 bo->priv_flags = 0;
1141 bo->mem.placement = (TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED);
1142 bo->persistent_swap_storage = persistent_swap_storage;
1143 bo->acc_size = acc_size;
1144 bo->sg = sg;
1145 bo->resv = &bo->ttm_resv;
1146 reservation_object_init(bo->resv);
1147 atomic_inc(&bo->glob->bo_count);
1148 drm_vma_node_reset(&bo->vma_node);
1149
1150 ret = ttm_bo_check_placement(bo, placement);
1151
1152 /*
1153 * For ttm_bo_type_device buffers, allocate
1154 * address space from the device.
1155 */
1156 if (likely(!ret) &&
1157 (bo->type == ttm_bo_type_device ||
1158 bo->type == ttm_bo_type_sg))
1159 ret = drm_vma_offset_add(&bdev->vma_manager, &bo->vma_node,
1160 bo->mem.num_pages);
1161
1162 locked = ww_mutex_trylock(&bo->resv->lock);
1163 WARN_ON(!locked);
1164
1165 if (likely(!ret))
1166 ret = ttm_bo_validate(bo, placement, interruptible, false);
1167
1168 ttm_bo_unreserve(bo);
1169
1170 if (unlikely(ret))
1171 ttm_bo_unref(&bo);
1172
1173 return ret;
1174 }
1175 EXPORT_SYMBOL(ttm_bo_init);
1176
1177 size_t ttm_bo_acc_size(struct ttm_bo_device *bdev,
1178 unsigned long bo_size,
1179 unsigned struct_size)
1180 {
1181 unsigned npages = (PAGE_ALIGN(bo_size)) >> PAGE_SHIFT;
1182 size_t size = 0;
1183
1184 size += ttm_round_pot(struct_size);
1185 size += PAGE_ALIGN(npages * sizeof(void *));
1186 size += ttm_round_pot(sizeof(struct ttm_tt));
1187 return size;
1188 }
1189 EXPORT_SYMBOL(ttm_bo_acc_size);
1190
1191 size_t ttm_bo_dma_acc_size(struct ttm_bo_device *bdev,
1192 unsigned long bo_size,
1193 unsigned struct_size)
1194 {
1195 unsigned npages = (PAGE_ALIGN(bo_size)) >> PAGE_SHIFT;
1196 size_t size = 0;
1197
1198 size += ttm_round_pot(struct_size);
1199 size += PAGE_ALIGN(npages * sizeof(void *));
1200 size += PAGE_ALIGN(npages * sizeof(dma_addr_t));
1201 size += ttm_round_pot(sizeof(struct ttm_dma_tt));
1202 return size;
1203 }
1204 EXPORT_SYMBOL(ttm_bo_dma_acc_size);
1205
1206 int ttm_bo_create(struct ttm_bo_device *bdev,
1207 unsigned long size,
1208 enum ttm_bo_type type,
1209 struct ttm_placement *placement,
1210 uint32_t page_alignment,
1211 bool interruptible,
1212 struct file *persistent_swap_storage,
1213 struct ttm_buffer_object **p_bo)
1214 {
1215 struct ttm_buffer_object *bo;
1216 size_t acc_size;
1217 int ret;
1218
1219 bo = kzalloc(sizeof(*bo), GFP_KERNEL);
1220 if (unlikely(bo == NULL))
1221 return -ENOMEM;
1222
1223 acc_size = ttm_bo_acc_size(bdev, size, sizeof(struct ttm_buffer_object));
1224 ret = ttm_bo_init(bdev, bo, size, type, placement, page_alignment,
1225 interruptible, persistent_swap_storage, acc_size,
1226 NULL, NULL);
1227 if (likely(ret == 0))
1228 *p_bo = bo;
1229
1230 return ret;
1231 }
1232 EXPORT_SYMBOL(ttm_bo_create);
1233
1234 static int ttm_bo_force_list_clean(struct ttm_bo_device *bdev,
1235 unsigned mem_type, bool allow_errors)
1236 {
1237 struct ttm_mem_type_manager *man = &bdev->man[mem_type];
1238 struct ttm_bo_global *glob = bdev->glob;
1239 int ret;
1240
1241 /*
1242 * Can't use standard list traversal since we're unlocking.
1243 */
1244
1245 spin_lock(&glob->lru_lock);
1246 while (!list_empty(&man->lru)) {
1247 spin_unlock(&glob->lru_lock);
1248 ret = ttm_mem_evict_first(bdev, mem_type, false, false);
1249 if (ret) {
1250 if (allow_errors) {
1251 return ret;
1252 } else {
1253 pr_err("Cleanup eviction failed\n");
1254 }
1255 }
1256 spin_lock(&glob->lru_lock);
1257 }
1258 spin_unlock(&glob->lru_lock);
1259 return 0;
1260 }
1261
1262 int ttm_bo_clean_mm(struct ttm_bo_device *bdev, unsigned mem_type)
1263 {
1264 struct ttm_mem_type_manager *man;
1265 int ret = -EINVAL;
1266
1267 if (mem_type >= TTM_NUM_MEM_TYPES) {
1268 pr_err("Illegal memory type %d\n", mem_type);
1269 return ret;
1270 }
1271 man = &bdev->man[mem_type];
1272
1273 if (!man->has_type) {
1274 pr_err("Trying to take down uninitialized memory manager type %u\n",
1275 mem_type);
1276 return ret;
1277 }
1278
1279 man->use_type = false;
1280 man->has_type = false;
1281
1282 ret = 0;
1283 if (mem_type > 0) {
1284 ttm_bo_force_list_clean(bdev, mem_type, false);
1285
1286 ret = (*man->func->takedown)(man);
1287 }
1288
1289 return ret;
1290 }
1291 EXPORT_SYMBOL(ttm_bo_clean_mm);
1292
1293 int ttm_bo_evict_mm(struct ttm_bo_device *bdev, unsigned mem_type)
1294 {
1295 struct ttm_mem_type_manager *man = &bdev->man[mem_type];
1296
1297 if (mem_type == 0 || mem_type >= TTM_NUM_MEM_TYPES) {
1298 pr_err("Illegal memory manager memory type %u\n", mem_type);
1299 return -EINVAL;
1300 }
1301
1302 if (!man->has_type) {
1303 pr_err("Memory type %u has not been initialized\n", mem_type);
1304 return 0;
1305 }
1306
1307 return ttm_bo_force_list_clean(bdev, mem_type, true);
1308 }
1309 EXPORT_SYMBOL(ttm_bo_evict_mm);
1310
1311 int ttm_bo_init_mm(struct ttm_bo_device *bdev, unsigned type,
1312 unsigned long p_size)
1313 {
1314 int ret = -EINVAL;
1315 struct ttm_mem_type_manager *man;
1316
1317 BUG_ON(type >= TTM_NUM_MEM_TYPES);
1318 man = &bdev->man[type];
1319 BUG_ON(man->has_type);
1320 man->io_reserve_fastpath = true;
1321 man->use_io_reserve_lru = false;
1322 mutex_init(&man->io_reserve_mutex);
1323 INIT_LIST_HEAD(&man->io_reserve_lru);
1324
1325 ret = bdev->driver->init_mem_type(bdev, type, man);
1326 if (ret)
1327 return ret;
1328 man->bdev = bdev;
1329
1330 ret = 0;
1331 if (type != TTM_PL_SYSTEM) {
1332 ret = (*man->func->init)(man, p_size);
1333 if (ret)
1334 return ret;
1335 }
1336 man->has_type = true;
1337 man->use_type = true;
1338 man->size = p_size;
1339
1340 INIT_LIST_HEAD(&man->lru);
1341
1342 return 0;
1343 }
1344 EXPORT_SYMBOL(ttm_bo_init_mm);
1345
1346 static void ttm_bo_global_kobj_release(struct kobject *kobj)
1347 {
1348 struct ttm_bo_global *glob =
1349 container_of(kobj, struct ttm_bo_global, kobj);
1350
1351 ttm_mem_unregister_shrink(glob->mem_glob, &glob->shrink);
1352 __free_page(glob->dummy_read_page);
1353 kfree(glob);
1354 }
1355
1356 void ttm_bo_global_release(struct drm_global_reference *ref)
1357 {
1358 struct ttm_bo_global *glob = ref->object;
1359
1360 kobject_del(&glob->kobj);
1361 kobject_put(&glob->kobj);
1362 }
1363 EXPORT_SYMBOL(ttm_bo_global_release);
1364
1365 int ttm_bo_global_init(struct drm_global_reference *ref)
1366 {
1367 struct ttm_bo_global_ref *bo_ref =
1368 container_of(ref, struct ttm_bo_global_ref, ref);
1369 struct ttm_bo_global *glob = ref->object;
1370 int ret;
1371
1372 mutex_init(&glob->device_list_mutex);
1373 spin_lock_init(&glob->lru_lock);
1374 glob->mem_glob = bo_ref->mem_glob;
1375 glob->dummy_read_page = alloc_page(__GFP_ZERO | GFP_DMA32);
1376
1377 if (unlikely(glob->dummy_read_page == NULL)) {
1378 ret = -ENOMEM;
1379 goto out_no_drp;
1380 }
1381
1382 INIT_LIST_HEAD(&glob->swap_lru);
1383 INIT_LIST_HEAD(&glob->device_list);
1384
1385 ttm_mem_init_shrink(&glob->shrink, ttm_bo_swapout);
1386 ret = ttm_mem_register_shrink(glob->mem_glob, &glob->shrink);
1387 if (unlikely(ret != 0)) {
1388 pr_err("Could not register buffer object swapout\n");
1389 goto out_no_shrink;
1390 }
1391
1392 atomic_set(&glob->bo_count, 0);
1393
1394 ret = kobject_init_and_add(
1395 &glob->kobj, &ttm_bo_glob_kobj_type, ttm_get_kobj(), "buffer_objects");
1396 if (unlikely(ret != 0))
1397 kobject_put(&glob->kobj);
1398 return ret;
1399 out_no_shrink:
1400 __free_page(glob->dummy_read_page);
1401 out_no_drp:
1402 kfree(glob);
1403 return ret;
1404 }
1405 EXPORT_SYMBOL(ttm_bo_global_init);
1406
1407
1408 int ttm_bo_device_release(struct ttm_bo_device *bdev)
1409 {
1410 int ret = 0;
1411 unsigned i = TTM_NUM_MEM_TYPES;
1412 struct ttm_mem_type_manager *man;
1413 struct ttm_bo_global *glob = bdev->glob;
1414
1415 while (i--) {
1416 man = &bdev->man[i];
1417 if (man->has_type) {
1418 man->use_type = false;
1419 if ((i != TTM_PL_SYSTEM) && ttm_bo_clean_mm(bdev, i)) {
1420 ret = -EBUSY;
1421 pr_err("DRM memory manager type %d is not clean\n",
1422 i);
1423 }
1424 man->has_type = false;
1425 }
1426 }
1427
1428 mutex_lock(&glob->device_list_mutex);
1429 list_del(&bdev->device_list);
1430 mutex_unlock(&glob->device_list_mutex);
1431
1432 cancel_delayed_work_sync(&bdev->wq);
1433
1434 while (ttm_bo_delayed_delete(bdev, true))
1435 ;
1436
1437 spin_lock(&glob->lru_lock);
1438 if (list_empty(&bdev->ddestroy))
1439 TTM_DEBUG("Delayed destroy list was clean\n");
1440
1441 if (list_empty(&bdev->man[0].lru))
1442 TTM_DEBUG("Swap list was clean\n");
1443 spin_unlock(&glob->lru_lock);
1444
1445 drm_vma_offset_manager_destroy(&bdev->vma_manager);
1446
1447 return ret;
1448 }
1449 EXPORT_SYMBOL(ttm_bo_device_release);
1450
1451 int ttm_bo_device_init(struct ttm_bo_device *bdev,
1452 struct ttm_bo_global *glob,
1453 struct ttm_bo_driver *driver,
1454 struct address_space *mapping,
1455 uint64_t file_page_offset,
1456 bool need_dma32)
1457 {
1458 int ret = -EINVAL;
1459
1460 bdev->driver = driver;
1461
1462 memset(bdev->man, 0, sizeof(bdev->man));
1463
1464 /*
1465 * Initialize the system memory buffer type.
1466 * Other types need to be driver / IOCTL initialized.
1467 */
1468 ret = ttm_bo_init_mm(bdev, TTM_PL_SYSTEM, 0);
1469 if (unlikely(ret != 0))
1470 goto out_no_sys;
1471
1472 drm_vma_offset_manager_init(&bdev->vma_manager, file_page_offset,
1473 0x10000000);
1474 INIT_DELAYED_WORK(&bdev->wq, ttm_bo_delayed_workqueue);
1475 INIT_LIST_HEAD(&bdev->ddestroy);
1476 bdev->dev_mapping = mapping;
1477 bdev->glob = glob;
1478 bdev->need_dma32 = need_dma32;
1479 bdev->val_seq = 0;
1480 spin_lock_init(&bdev->fence_lock);
1481 mutex_lock(&glob->device_list_mutex);
1482 list_add_tail(&bdev->device_list, &glob->device_list);
1483 mutex_unlock(&glob->device_list_mutex);
1484
1485 return 0;
1486 out_no_sys:
1487 return ret;
1488 }
1489 EXPORT_SYMBOL(ttm_bo_device_init);
1490
1491 /*
1492 * buffer object vm functions.
1493 */
1494
1495 bool ttm_mem_reg_is_pci(struct ttm_bo_device *bdev, struct ttm_mem_reg *mem)
1496 {
1497 struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
1498
1499 if (!(man->flags & TTM_MEMTYPE_FLAG_FIXED)) {
1500 if (mem->mem_type == TTM_PL_SYSTEM)
1501 return false;
1502
1503 if (man->flags & TTM_MEMTYPE_FLAG_CMA)
1504 return false;
1505
1506 if (mem->placement & TTM_PL_FLAG_CACHED)
1507 return false;
1508 }
1509 return true;
1510 }
1511
1512 void ttm_bo_unmap_virtual_locked(struct ttm_buffer_object *bo)
1513 {
1514 struct ttm_bo_device *bdev = bo->bdev;
1515
1516 drm_vma_node_unmap(&bo->vma_node, bdev->dev_mapping);
1517 ttm_mem_io_free_vm(bo);
1518 }
1519
1520 void ttm_bo_unmap_virtual(struct ttm_buffer_object *bo)
1521 {
1522 struct ttm_bo_device *bdev = bo->bdev;
1523 struct ttm_mem_type_manager *man = &bdev->man[bo->mem.mem_type];
1524
1525 ttm_mem_io_lock(man, false);
1526 ttm_bo_unmap_virtual_locked(bo);
1527 ttm_mem_io_unlock(man);
1528 }
1529
1530
1531 EXPORT_SYMBOL(ttm_bo_unmap_virtual);
1532
1533
1534 int ttm_bo_wait(struct ttm_buffer_object *bo,
1535 bool lazy, bool interruptible, bool no_wait)
1536 {
1537 struct ttm_bo_driver *driver = bo->bdev->driver;
1538 struct ttm_bo_device *bdev = bo->bdev;
1539 void *sync_obj;
1540 int ret = 0;
1541
1542 if (likely(bo->sync_obj == NULL))
1543 return 0;
1544
1545 while (bo->sync_obj) {
1546
1547 if (driver->sync_obj_signaled(bo->sync_obj)) {
1548 void *tmp_obj = bo->sync_obj;
1549 bo->sync_obj = NULL;
1550 clear_bit(TTM_BO_PRIV_FLAG_MOVING, &bo->priv_flags);
1551 spin_unlock(&bdev->fence_lock);
1552 driver->sync_obj_unref(&tmp_obj);
1553 spin_lock(&bdev->fence_lock);
1554 continue;
1555 }
1556
1557 if (no_wait)
1558 return -EBUSY;
1559
1560 sync_obj = driver->sync_obj_ref(bo->sync_obj);
1561 spin_unlock(&bdev->fence_lock);
1562 ret = driver->sync_obj_wait(sync_obj,
1563 lazy, interruptible);
1564 if (unlikely(ret != 0)) {
1565 driver->sync_obj_unref(&sync_obj);
1566 spin_lock(&bdev->fence_lock);
1567 return ret;
1568 }
1569 spin_lock(&bdev->fence_lock);
1570 if (likely(bo->sync_obj == sync_obj)) {
1571 void *tmp_obj = bo->sync_obj;
1572 bo->sync_obj = NULL;
1573 clear_bit(TTM_BO_PRIV_FLAG_MOVING,
1574 &bo->priv_flags);
1575 spin_unlock(&bdev->fence_lock);
1576 driver->sync_obj_unref(&sync_obj);
1577 driver->sync_obj_unref(&tmp_obj);
1578 spin_lock(&bdev->fence_lock);
1579 } else {
1580 spin_unlock(&bdev->fence_lock);
1581 driver->sync_obj_unref(&sync_obj);
1582 spin_lock(&bdev->fence_lock);
1583 }
1584 }
1585 return 0;
1586 }
1587 EXPORT_SYMBOL(ttm_bo_wait);
1588
1589 int ttm_bo_synccpu_write_grab(struct ttm_buffer_object *bo, bool no_wait)
1590 {
1591 struct ttm_bo_device *bdev = bo->bdev;
1592 int ret = 0;
1593
1594 /*
1595 * Using ttm_bo_reserve makes sure the lru lists are updated.
1596 */
1597
1598 ret = ttm_bo_reserve(bo, true, no_wait, false, NULL);
1599 if (unlikely(ret != 0))
1600 return ret;
1601 spin_lock(&bdev->fence_lock);
1602 ret = ttm_bo_wait(bo, false, true, no_wait);
1603 spin_unlock(&bdev->fence_lock);
1604 if (likely(ret == 0))
1605 atomic_inc(&bo->cpu_writers);
1606 ttm_bo_unreserve(bo);
1607 return ret;
1608 }
1609 EXPORT_SYMBOL(ttm_bo_synccpu_write_grab);
1610
1611 void ttm_bo_synccpu_write_release(struct ttm_buffer_object *bo)
1612 {
1613 atomic_dec(&bo->cpu_writers);
1614 }
1615 EXPORT_SYMBOL(ttm_bo_synccpu_write_release);
1616
1617 /**
1618 * A buffer object shrink method that tries to swap out the first
1619 * buffer object on the bo_global::swap_lru list.
1620 */
1621
1622 static int ttm_bo_swapout(struct ttm_mem_shrink *shrink)
1623 {
1624 struct ttm_bo_global *glob =
1625 container_of(shrink, struct ttm_bo_global, shrink);
1626 struct ttm_buffer_object *bo;
1627 int ret = -EBUSY;
1628 int put_count;
1629 uint32_t swap_placement = (TTM_PL_FLAG_CACHED | TTM_PL_FLAG_SYSTEM);
1630
1631 spin_lock(&glob->lru_lock);
1632 list_for_each_entry(bo, &glob->swap_lru, swap) {
1633 ret = __ttm_bo_reserve(bo, false, true, false, NULL);
1634 if (!ret)
1635 break;
1636 }
1637
1638 if (ret) {
1639 spin_unlock(&glob->lru_lock);
1640 return ret;
1641 }
1642
1643 kref_get(&bo->list_kref);
1644
1645 if (!list_empty(&bo->ddestroy)) {
1646 ret = ttm_bo_cleanup_refs_and_unlock(bo, false, false);
1647 kref_put(&bo->list_kref, ttm_bo_release_list);
1648 return ret;
1649 }
1650
1651 put_count = ttm_bo_del_from_lru(bo);
1652 spin_unlock(&glob->lru_lock);
1653
1654 ttm_bo_list_ref_sub(bo, put_count, true);
1655
1656 /**
1657 * Wait for GPU, then move to system cached.
1658 */
1659
1660 spin_lock(&bo->bdev->fence_lock);
1661 ret = ttm_bo_wait(bo, false, false, false);
1662 spin_unlock(&bo->bdev->fence_lock);
1663
1664 if (unlikely(ret != 0))
1665 goto out;
1666
1667 if ((bo->mem.placement & swap_placement) != swap_placement) {
1668 struct ttm_mem_reg evict_mem;
1669
1670 evict_mem = bo->mem;
1671 evict_mem.mm_node = NULL;
1672 evict_mem.placement = TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED;
1673 evict_mem.mem_type = TTM_PL_SYSTEM;
1674
1675 ret = ttm_bo_handle_move_mem(bo, &evict_mem, true,
1676 false, false);
1677 if (unlikely(ret != 0))
1678 goto out;
1679 }
1680
1681 ttm_bo_unmap_virtual(bo);
1682
1683 /**
1684 * Swap out. Buffer will be swapped in again as soon as
1685 * anyone tries to access a ttm page.
1686 */
1687
1688 if (bo->bdev->driver->swap_notify)
1689 bo->bdev->driver->swap_notify(bo);
1690
1691 ret = ttm_tt_swapout(bo->ttm, bo->persistent_swap_storage);
1692 out:
1693
1694 /**
1695 *
1696 * Unreserve without putting on LRU to avoid swapping out an
1697 * already swapped buffer.
1698 */
1699
1700 __ttm_bo_unreserve(bo);
1701 kref_put(&bo->list_kref, ttm_bo_release_list);
1702 return ret;
1703 }
1704
1705 void ttm_bo_swapout_all(struct ttm_bo_device *bdev)
1706 {
1707 while (ttm_bo_swapout(&bdev->glob->shrink) == 0)
1708 ;
1709 }
1710 EXPORT_SYMBOL(ttm_bo_swapout_all);
1711
1712 /**
1713 * ttm_bo_wait_unreserved - interruptible wait for a buffer object to become
1714 * unreserved
1715 *
1716 * @bo: Pointer to buffer
1717 */
1718 int ttm_bo_wait_unreserved(struct ttm_buffer_object *bo)
1719 {
1720 int ret;
1721
1722 /*
1723 * In the absense of a wait_unlocked API,
1724 * Use the bo::wu_mutex to avoid triggering livelocks due to
1725 * concurrent use of this function. Note that this use of
1726 * bo::wu_mutex can go away if we change locking order to
1727 * mmap_sem -> bo::reserve.
1728 */
1729 ret = mutex_lock_interruptible(&bo->wu_mutex);
1730 if (unlikely(ret != 0))
1731 return -ERESTARTSYS;
1732 if (!ww_mutex_is_locked(&bo->resv->lock))
1733 goto out_unlock;
1734 ret = __ttm_bo_reserve(bo, true, false, false, NULL);
1735 if (unlikely(ret != 0))
1736 goto out_unlock;
1737 __ttm_bo_unreserve(bo);
1738
1739 out_unlock:
1740 mutex_unlock(&bo->wu_mutex);
1741 return ret;
1742 }
Linux kernel - Deliverables
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