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[mirror_ubuntu-focal-kernel.git] / drivers / gpu / drm / ttm / ttm_bo.c
1 /* SPDX-License-Identifier: GPL-2.0 OR MIT */
2 /**************************************************************************
3 *
4 * Copyright (c) 2006-2009 VMware, Inc., Palo Alto, CA., USA
5 * All Rights Reserved.
6 *
7 * Permission is hereby granted, free of charge, to any person obtaining a
8 * copy of this software and associated documentation files (the
9 * "Software"), to deal in the Software without restriction, including
10 * without limitation the rights to use, copy, modify, merge, publish,
11 * distribute, sub license, and/or sell copies of the Software, and to
12 * permit persons to whom the Software is furnished to do so, subject to
13 * the following conditions:
14 *
15 * The above copyright notice and this permission notice (including the
16 * next paragraph) shall be included in all copies or substantial portions
17 * of the Software.
18 *
19 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
20 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
21 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
22 * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
23 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
24 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
25 * USE OR OTHER DEALINGS IN THE SOFTWARE.
26 *
27 **************************************************************************/
28 /*
29 * Authors: Thomas Hellstrom <thellstrom-at-vmware-dot-com>
30 */
31
32 #define pr_fmt(fmt) "[TTM] " fmt
33
34 #include <drm/ttm/ttm_module.h>
35 #include <drm/ttm/ttm_bo_driver.h>
36 #include <drm/ttm/ttm_placement.h>
37 #include <linux/jiffies.h>
38 #include <linux/slab.h>
39 #include <linux/sched.h>
40 #include <linux/mm.h>
41 #include <linux/file.h>
42 #include <linux/module.h>
43 #include <linux/atomic.h>
44 #include <linux/reservation.h>
45
46 static void ttm_bo_global_kobj_release(struct kobject *kobj);
47
48 /**
49 * ttm_global_mutex - protecting the global BO state
50 */
51 DEFINE_MUTEX(ttm_global_mutex);
52 unsigned ttm_bo_glob_use_count;
53 struct ttm_bo_global ttm_bo_glob;
54
55 static struct attribute ttm_bo_count = {
56 .name = "bo_count",
57 .mode = S_IRUGO
58 };
59
60 /* default destructor */
61 static void ttm_bo_default_destroy(struct ttm_buffer_object *bo)
62 {
63 kfree(bo);
64 }
65
66 static inline int ttm_mem_type_from_place(const struct ttm_place *place,
67 uint32_t *mem_type)
68 {
69 int pos;
70
71 pos = ffs(place->flags & TTM_PL_MASK_MEM);
72 if (unlikely(!pos))
73 return -EINVAL;
74
75 *mem_type = pos - 1;
76 return 0;
77 }
78
79 static void ttm_mem_type_debug(struct ttm_bo_device *bdev, struct drm_printer *p,
80 int mem_type)
81 {
82 struct ttm_mem_type_manager *man = &bdev->man[mem_type];
83
84 drm_printf(p, " has_type: %d\n", man->has_type);
85 drm_printf(p, " use_type: %d\n", man->use_type);
86 drm_printf(p, " flags: 0x%08X\n", man->flags);
87 drm_printf(p, " gpu_offset: 0x%08llX\n", man->gpu_offset);
88 drm_printf(p, " size: %llu\n", man->size);
89 drm_printf(p, " available_caching: 0x%08X\n", man->available_caching);
90 drm_printf(p, " default_caching: 0x%08X\n", man->default_caching);
91 if (mem_type != TTM_PL_SYSTEM)
92 (*man->func->debug)(man, p);
93 }
94
95 static void ttm_bo_mem_space_debug(struct ttm_buffer_object *bo,
96 struct ttm_placement *placement)
97 {
98 struct drm_printer p = drm_debug_printer(TTM_PFX);
99 int i, ret, mem_type;
100
101 drm_printf(&p, "No space for %p (%lu pages, %luK, %luM)\n",
102 bo, bo->mem.num_pages, bo->mem.size >> 10,
103 bo->mem.size >> 20);
104 for (i = 0; i < placement->num_placement; i++) {
105 ret = ttm_mem_type_from_place(&placement->placement[i],
106 &mem_type);
107 if (ret)
108 return;
109 drm_printf(&p, " placement[%d]=0x%08X (%d)\n",
110 i, placement->placement[i].flags, mem_type);
111 ttm_mem_type_debug(bo->bdev, &p, mem_type);
112 }
113 }
114
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, "%d\n",
123 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
141
142 static inline uint32_t ttm_bo_type_flags(unsigned type)
143 {
144 return 1 << (type);
145 }
146
147 static void ttm_bo_release_list(struct kref *list_kref)
148 {
149 struct ttm_buffer_object *bo =
150 container_of(list_kref, struct ttm_buffer_object, list_kref);
151 struct ttm_bo_device *bdev = bo->bdev;
152 size_t acc_size = bo->acc_size;
153
154 BUG_ON(kref_read(&bo->list_kref));
155 BUG_ON(kref_read(&bo->kref));
156 BUG_ON(atomic_read(&bo->cpu_writers));
157 BUG_ON(bo->mem.mm_node != NULL);
158 BUG_ON(!list_empty(&bo->lru));
159 BUG_ON(!list_empty(&bo->ddestroy));
160 ttm_tt_destroy(bo->ttm);
161 atomic_dec(&bo->bdev->glob->bo_count);
162 dma_fence_put(bo->moving);
163 reservation_object_fini(&bo->ttm_resv);
164 mutex_destroy(&bo->wu_mutex);
165 bo->destroy(bo);
166 ttm_mem_global_free(bdev->glob->mem_glob, acc_size);
167 }
168
169 static void ttm_bo_add_mem_to_lru(struct ttm_buffer_object *bo,
170 struct ttm_mem_reg *mem)
171 {
172 struct ttm_bo_device *bdev = bo->bdev;
173 struct ttm_mem_type_manager *man;
174
175 reservation_object_assert_held(bo->resv);
176
177 if (!list_empty(&bo->lru))
178 return;
179
180 if (mem->placement & TTM_PL_FLAG_NO_EVICT)
181 return;
182
183 man = &bdev->man[mem->mem_type];
184 list_add_tail(&bo->lru, &man->lru[bo->priority]);
185 kref_get(&bo->list_kref);
186
187 if (bo->ttm && !(bo->ttm->page_flags &
188 (TTM_PAGE_FLAG_SG | TTM_PAGE_FLAG_SWAPPED))) {
189 list_add_tail(&bo->swap, &bdev->glob->swap_lru[bo->priority]);
190 kref_get(&bo->list_kref);
191 }
192 }
193
194 void ttm_bo_add_to_lru(struct ttm_buffer_object *bo)
195 {
196 ttm_bo_add_mem_to_lru(bo, &bo->mem);
197 }
198 EXPORT_SYMBOL(ttm_bo_add_to_lru);
199
200 static void ttm_bo_ref_bug(struct kref *list_kref)
201 {
202 BUG();
203 }
204
205 void ttm_bo_del_from_lru(struct ttm_buffer_object *bo)
206 {
207 struct ttm_bo_device *bdev = bo->bdev;
208 bool notify = false;
209
210 if (!list_empty(&bo->swap)) {
211 list_del_init(&bo->swap);
212 kref_put(&bo->list_kref, ttm_bo_ref_bug);
213 notify = true;
214 }
215 if (!list_empty(&bo->lru)) {
216 list_del_init(&bo->lru);
217 kref_put(&bo->list_kref, ttm_bo_ref_bug);
218 notify = true;
219 }
220
221 if (notify && bdev->driver->del_from_lru_notify)
222 bdev->driver->del_from_lru_notify(bo);
223 }
224
225 void ttm_bo_del_sub_from_lru(struct ttm_buffer_object *bo)
226 {
227 struct ttm_bo_global *glob = bo->bdev->glob;
228
229 spin_lock(&glob->lru_lock);
230 ttm_bo_del_from_lru(bo);
231 spin_unlock(&glob->lru_lock);
232 }
233 EXPORT_SYMBOL(ttm_bo_del_sub_from_lru);
234
235 static void ttm_bo_bulk_move_set_pos(struct ttm_lru_bulk_move_pos *pos,
236 struct ttm_buffer_object *bo)
237 {
238 if (!pos->first)
239 pos->first = bo;
240 pos->last = bo;
241 }
242
243 void ttm_bo_move_to_lru_tail(struct ttm_buffer_object *bo,
244 struct ttm_lru_bulk_move *bulk)
245 {
246 reservation_object_assert_held(bo->resv);
247
248 ttm_bo_del_from_lru(bo);
249 ttm_bo_add_to_lru(bo);
250
251 if (bulk && !(bo->mem.placement & TTM_PL_FLAG_NO_EVICT)) {
252 switch (bo->mem.mem_type) {
253 case TTM_PL_TT:
254 ttm_bo_bulk_move_set_pos(&bulk->tt[bo->priority], bo);
255 break;
256
257 case TTM_PL_VRAM:
258 ttm_bo_bulk_move_set_pos(&bulk->vram[bo->priority], bo);
259 break;
260 }
261 if (bo->ttm && !(bo->ttm->page_flags &
262 (TTM_PAGE_FLAG_SG | TTM_PAGE_FLAG_SWAPPED)))
263 ttm_bo_bulk_move_set_pos(&bulk->swap[bo->priority], bo);
264 }
265 }
266 EXPORT_SYMBOL(ttm_bo_move_to_lru_tail);
267
268 void ttm_bo_bulk_move_lru_tail(struct ttm_lru_bulk_move *bulk)
269 {
270 unsigned i;
271
272 for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i) {
273 struct ttm_lru_bulk_move_pos *pos = &bulk->tt[i];
274 struct ttm_mem_type_manager *man;
275
276 if (!pos->first)
277 continue;
278
279 reservation_object_assert_held(pos->first->resv);
280 reservation_object_assert_held(pos->last->resv);
281
282 man = &pos->first->bdev->man[TTM_PL_TT];
283 list_bulk_move_tail(&man->lru[i], &pos->first->lru,
284 &pos->last->lru);
285 }
286
287 for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i) {
288 struct ttm_lru_bulk_move_pos *pos = &bulk->vram[i];
289 struct ttm_mem_type_manager *man;
290
291 if (!pos->first)
292 continue;
293
294 reservation_object_assert_held(pos->first->resv);
295 reservation_object_assert_held(pos->last->resv);
296
297 man = &pos->first->bdev->man[TTM_PL_VRAM];
298 list_bulk_move_tail(&man->lru[i], &pos->first->lru,
299 &pos->last->lru);
300 }
301
302 for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i) {
303 struct ttm_lru_bulk_move_pos *pos = &bulk->swap[i];
304 struct list_head *lru;
305
306 if (!pos->first)
307 continue;
308
309 reservation_object_assert_held(pos->first->resv);
310 reservation_object_assert_held(pos->last->resv);
311
312 lru = &pos->first->bdev->glob->swap_lru[i];
313 list_bulk_move_tail(lru, &pos->first->swap, &pos->last->swap);
314 }
315 }
316 EXPORT_SYMBOL(ttm_bo_bulk_move_lru_tail);
317
318 static int ttm_bo_handle_move_mem(struct ttm_buffer_object *bo,
319 struct ttm_mem_reg *mem, bool evict,
320 struct ttm_operation_ctx *ctx)
321 {
322 struct ttm_bo_device *bdev = bo->bdev;
323 bool old_is_pci = ttm_mem_reg_is_pci(bdev, &bo->mem);
324 bool new_is_pci = ttm_mem_reg_is_pci(bdev, mem);
325 struct ttm_mem_type_manager *old_man = &bdev->man[bo->mem.mem_type];
326 struct ttm_mem_type_manager *new_man = &bdev->man[mem->mem_type];
327 int ret = 0;
328
329 if (old_is_pci || new_is_pci ||
330 ((mem->placement & bo->mem.placement & TTM_PL_MASK_CACHING) == 0)) {
331 ret = ttm_mem_io_lock(old_man, true);
332 if (unlikely(ret != 0))
333 goto out_err;
334 ttm_bo_unmap_virtual_locked(bo);
335 ttm_mem_io_unlock(old_man);
336 }
337
338 /*
339 * Create and bind a ttm if required.
340 */
341
342 if (!(new_man->flags & TTM_MEMTYPE_FLAG_FIXED)) {
343 if (bo->ttm == NULL) {
344 bool zero = !(old_man->flags & TTM_MEMTYPE_FLAG_FIXED);
345 ret = ttm_tt_create(bo, zero);
346 if (ret)
347 goto out_err;
348 }
349
350 ret = ttm_tt_set_placement_caching(bo->ttm, mem->placement);
351 if (ret)
352 goto out_err;
353
354 if (mem->mem_type != TTM_PL_SYSTEM) {
355 ret = ttm_tt_bind(bo->ttm, mem, ctx);
356 if (ret)
357 goto out_err;
358 }
359
360 if (bo->mem.mem_type == TTM_PL_SYSTEM) {
361 if (bdev->driver->move_notify)
362 bdev->driver->move_notify(bo, evict, mem);
363 bo->mem = *mem;
364 mem->mm_node = NULL;
365 goto moved;
366 }
367 }
368
369 if (bdev->driver->move_notify)
370 bdev->driver->move_notify(bo, evict, mem);
371
372 if (!(old_man->flags & TTM_MEMTYPE_FLAG_FIXED) &&
373 !(new_man->flags & TTM_MEMTYPE_FLAG_FIXED))
374 ret = ttm_bo_move_ttm(bo, ctx, mem);
375 else if (bdev->driver->move)
376 ret = bdev->driver->move(bo, evict, ctx, mem);
377 else
378 ret = ttm_bo_move_memcpy(bo, ctx, mem);
379
380 if (ret) {
381 if (bdev->driver->move_notify) {
382 swap(*mem, bo->mem);
383 bdev->driver->move_notify(bo, false, mem);
384 swap(*mem, bo->mem);
385 }
386
387 goto out_err;
388 }
389
390 moved:
391 if (bo->evicted) {
392 if (bdev->driver->invalidate_caches) {
393 ret = bdev->driver->invalidate_caches(bdev, bo->mem.placement);
394 if (ret)
395 pr_err("Can not flush read caches\n");
396 }
397 bo->evicted = false;
398 }
399
400 if (bo->mem.mm_node)
401 bo->offset = (bo->mem.start << PAGE_SHIFT) +
402 bdev->man[bo->mem.mem_type].gpu_offset;
403 else
404 bo->offset = 0;
405
406 ctx->bytes_moved += bo->num_pages << PAGE_SHIFT;
407 return 0;
408
409 out_err:
410 new_man = &bdev->man[bo->mem.mem_type];
411 if (new_man->flags & TTM_MEMTYPE_FLAG_FIXED) {
412 ttm_tt_destroy(bo->ttm);
413 bo->ttm = NULL;
414 }
415
416 return ret;
417 }
418
419 /**
420 * Call bo::reserved.
421 * Will release GPU memory type usage on destruction.
422 * This is the place to put in driver specific hooks to release
423 * driver private resources.
424 * Will release the bo::reserved lock.
425 */
426
427 static void ttm_bo_cleanup_memtype_use(struct ttm_buffer_object *bo)
428 {
429 if (bo->bdev->driver->move_notify)
430 bo->bdev->driver->move_notify(bo, false, NULL);
431
432 ttm_tt_destroy(bo->ttm);
433 bo->ttm = NULL;
434 ttm_bo_mem_put(bo, &bo->mem);
435 }
436
437 static int ttm_bo_individualize_resv(struct ttm_buffer_object *bo)
438 {
439 int r;
440
441 if (bo->resv == &bo->ttm_resv)
442 return 0;
443
444 BUG_ON(!reservation_object_trylock(&bo->ttm_resv));
445
446 r = reservation_object_copy_fences(&bo->ttm_resv, bo->resv);
447 if (r)
448 reservation_object_unlock(&bo->ttm_resv);
449
450 return r;
451 }
452
453 static void ttm_bo_flush_all_fences(struct ttm_buffer_object *bo)
454 {
455 struct reservation_object_list *fobj;
456 struct dma_fence *fence;
457 int i;
458
459 fobj = reservation_object_get_list(&bo->ttm_resv);
460 fence = reservation_object_get_excl(&bo->ttm_resv);
461 if (fence && !fence->ops->signaled)
462 dma_fence_enable_sw_signaling(fence);
463
464 for (i = 0; fobj && i < fobj->shared_count; ++i) {
465 fence = rcu_dereference_protected(fobj->shared[i],
466 reservation_object_held(bo->resv));
467
468 if (!fence->ops->signaled)
469 dma_fence_enable_sw_signaling(fence);
470 }
471 }
472
473 static void ttm_bo_cleanup_refs_or_queue(struct ttm_buffer_object *bo)
474 {
475 struct ttm_bo_device *bdev = bo->bdev;
476 struct ttm_bo_global *glob = bdev->glob;
477 int ret;
478
479 ret = ttm_bo_individualize_resv(bo);
480 if (ret) {
481 /* Last resort, if we fail to allocate memory for the
482 * fences block for the BO to become idle
483 */
484 reservation_object_wait_timeout_rcu(bo->resv, true, false,
485 30 * HZ);
486 spin_lock(&glob->lru_lock);
487 goto error;
488 }
489
490 spin_lock(&glob->lru_lock);
491 ret = reservation_object_trylock(bo->resv) ? 0 : -EBUSY;
492 if (!ret) {
493 if (reservation_object_test_signaled_rcu(&bo->ttm_resv, true)) {
494 ttm_bo_del_from_lru(bo);
495 spin_unlock(&glob->lru_lock);
496 if (bo->resv != &bo->ttm_resv)
497 reservation_object_unlock(&bo->ttm_resv);
498
499 ttm_bo_cleanup_memtype_use(bo);
500 reservation_object_unlock(bo->resv);
501 return;
502 }
503
504 ttm_bo_flush_all_fences(bo);
505
506 /*
507 * Make NO_EVICT bos immediately available to
508 * shrinkers, now that they are queued for
509 * destruction.
510 */
511 if (bo->mem.placement & TTM_PL_FLAG_NO_EVICT) {
512 bo->mem.placement &= ~TTM_PL_FLAG_NO_EVICT;
513 ttm_bo_add_to_lru(bo);
514 }
515
516 reservation_object_unlock(bo->resv);
517 }
518 if (bo->resv != &bo->ttm_resv)
519 reservation_object_unlock(&bo->ttm_resv);
520
521 error:
522 kref_get(&bo->list_kref);
523 list_add_tail(&bo->ddestroy, &bdev->ddestroy);
524 spin_unlock(&glob->lru_lock);
525
526 schedule_delayed_work(&bdev->wq,
527 ((HZ / 100) < 1) ? 1 : HZ / 100);
528 }
529
530 /**
531 * function ttm_bo_cleanup_refs
532 * If bo idle, remove from delayed- and lru lists, and unref.
533 * If not idle, do nothing.
534 *
535 * Must be called with lru_lock and reservation held, this function
536 * will drop the lru lock and optionally the reservation lock before returning.
537 *
538 * @interruptible Any sleeps should occur interruptibly.
539 * @no_wait_gpu Never wait for gpu. Return -EBUSY instead.
540 * @unlock_resv Unlock the reservation lock as well.
541 */
542
543 static int ttm_bo_cleanup_refs(struct ttm_buffer_object *bo,
544 bool interruptible, bool no_wait_gpu,
545 bool unlock_resv)
546 {
547 struct ttm_bo_global *glob = bo->bdev->glob;
548 struct reservation_object *resv;
549 int ret;
550
551 if (unlikely(list_empty(&bo->ddestroy)))
552 resv = bo->resv;
553 else
554 resv = &bo->ttm_resv;
555
556 if (reservation_object_test_signaled_rcu(resv, true))
557 ret = 0;
558 else
559 ret = -EBUSY;
560
561 if (ret && !no_wait_gpu) {
562 long lret;
563
564 if (unlock_resv)
565 reservation_object_unlock(bo->resv);
566 spin_unlock(&glob->lru_lock);
567
568 lret = reservation_object_wait_timeout_rcu(resv, true,
569 interruptible,
570 30 * HZ);
571
572 if (lret < 0)
573 return lret;
574 else if (lret == 0)
575 return -EBUSY;
576
577 spin_lock(&glob->lru_lock);
578 if (unlock_resv && !reservation_object_trylock(bo->resv)) {
579 /*
580 * We raced, and lost, someone else holds the reservation now,
581 * and is probably busy in ttm_bo_cleanup_memtype_use.
582 *
583 * Even if it's not the case, because we finished waiting any
584 * delayed destruction would succeed, so just return success
585 * here.
586 */
587 spin_unlock(&glob->lru_lock);
588 return 0;
589 }
590 ret = 0;
591 }
592
593 if (ret || unlikely(list_empty(&bo->ddestroy))) {
594 if (unlock_resv)
595 reservation_object_unlock(bo->resv);
596 spin_unlock(&glob->lru_lock);
597 return ret;
598 }
599
600 ttm_bo_del_from_lru(bo);
601 list_del_init(&bo->ddestroy);
602 kref_put(&bo->list_kref, ttm_bo_ref_bug);
603
604 spin_unlock(&glob->lru_lock);
605 ttm_bo_cleanup_memtype_use(bo);
606
607 if (unlock_resv)
608 reservation_object_unlock(bo->resv);
609
610 return 0;
611 }
612
613 /**
614 * Traverse the delayed list, and call ttm_bo_cleanup_refs on all
615 * encountered buffers.
616 */
617 static bool ttm_bo_delayed_delete(struct ttm_bo_device *bdev, bool remove_all)
618 {
619 struct ttm_bo_global *glob = bdev->glob;
620 struct list_head removed;
621 bool empty;
622
623 INIT_LIST_HEAD(&removed);
624
625 spin_lock(&glob->lru_lock);
626 while (!list_empty(&bdev->ddestroy)) {
627 struct ttm_buffer_object *bo;
628
629 bo = list_first_entry(&bdev->ddestroy, struct ttm_buffer_object,
630 ddestroy);
631 kref_get(&bo->list_kref);
632 list_move_tail(&bo->ddestroy, &removed);
633
634 if (remove_all || bo->resv != &bo->ttm_resv) {
635 spin_unlock(&glob->lru_lock);
636 reservation_object_lock(bo->resv, NULL);
637
638 spin_lock(&glob->lru_lock);
639 ttm_bo_cleanup_refs(bo, false, !remove_all, true);
640
641 } else if (reservation_object_trylock(bo->resv)) {
642 ttm_bo_cleanup_refs(bo, false, !remove_all, true);
643 } else {
644 spin_unlock(&glob->lru_lock);
645 }
646
647 kref_put(&bo->list_kref, ttm_bo_release_list);
648 spin_lock(&glob->lru_lock);
649 }
650 list_splice_tail(&removed, &bdev->ddestroy);
651 empty = list_empty(&bdev->ddestroy);
652 spin_unlock(&glob->lru_lock);
653
654 return empty;
655 }
656
657 static void ttm_bo_delayed_workqueue(struct work_struct *work)
658 {
659 struct ttm_bo_device *bdev =
660 container_of(work, struct ttm_bo_device, wq.work);
661
662 if (!ttm_bo_delayed_delete(bdev, false))
663 schedule_delayed_work(&bdev->wq,
664 ((HZ / 100) < 1) ? 1 : HZ / 100);
665 }
666
667 static void ttm_bo_release(struct kref *kref)
668 {
669 struct ttm_buffer_object *bo =
670 container_of(kref, struct ttm_buffer_object, kref);
671 struct ttm_bo_device *bdev = bo->bdev;
672 struct ttm_mem_type_manager *man = &bdev->man[bo->mem.mem_type];
673
674 drm_vma_offset_remove(&bdev->vma_manager, &bo->vma_node);
675 ttm_mem_io_lock(man, false);
676 ttm_mem_io_free_vm(bo);
677 ttm_mem_io_unlock(man);
678 ttm_bo_cleanup_refs_or_queue(bo);
679 kref_put(&bo->list_kref, ttm_bo_release_list);
680 }
681
682 void ttm_bo_put(struct ttm_buffer_object *bo)
683 {
684 kref_put(&bo->kref, ttm_bo_release);
685 }
686 EXPORT_SYMBOL(ttm_bo_put);
687
688 int ttm_bo_lock_delayed_workqueue(struct ttm_bo_device *bdev)
689 {
690 return cancel_delayed_work_sync(&bdev->wq);
691 }
692 EXPORT_SYMBOL(ttm_bo_lock_delayed_workqueue);
693
694 void ttm_bo_unlock_delayed_workqueue(struct ttm_bo_device *bdev, int resched)
695 {
696 if (resched)
697 schedule_delayed_work(&bdev->wq,
698 ((HZ / 100) < 1) ? 1 : HZ / 100);
699 }
700 EXPORT_SYMBOL(ttm_bo_unlock_delayed_workqueue);
701
702 static int ttm_bo_evict(struct ttm_buffer_object *bo,
703 struct ttm_operation_ctx *ctx)
704 {
705 struct ttm_bo_device *bdev = bo->bdev;
706 struct ttm_mem_reg evict_mem;
707 struct ttm_placement placement;
708 int ret = 0;
709
710 reservation_object_assert_held(bo->resv);
711
712 placement.num_placement = 0;
713 placement.num_busy_placement = 0;
714 bdev->driver->evict_flags(bo, &placement);
715
716 if (!placement.num_placement && !placement.num_busy_placement) {
717 ret = ttm_bo_pipeline_gutting(bo);
718 if (ret)
719 return ret;
720
721 return ttm_tt_create(bo, false);
722 }
723
724 evict_mem = bo->mem;
725 evict_mem.mm_node = NULL;
726 evict_mem.bus.io_reserved_vm = false;
727 evict_mem.bus.io_reserved_count = 0;
728
729 ret = ttm_bo_mem_space(bo, &placement, &evict_mem, ctx);
730 if (ret) {
731 if (ret != -ERESTARTSYS) {
732 pr_err("Failed to find memory space for buffer 0x%p eviction\n",
733 bo);
734 ttm_bo_mem_space_debug(bo, &placement);
735 }
736 goto out;
737 }
738
739 ret = ttm_bo_handle_move_mem(bo, &evict_mem, true, ctx);
740 if (unlikely(ret)) {
741 if (ret != -ERESTARTSYS)
742 pr_err("Buffer eviction failed\n");
743 ttm_bo_mem_put(bo, &evict_mem);
744 goto out;
745 }
746 bo->evicted = true;
747 out:
748 return ret;
749 }
750
751 bool ttm_bo_eviction_valuable(struct ttm_buffer_object *bo,
752 const struct ttm_place *place)
753 {
754 /* Don't evict this BO if it's outside of the
755 * requested placement range
756 */
757 if (place->fpfn >= (bo->mem.start + bo->mem.size) ||
758 (place->lpfn && place->lpfn <= bo->mem.start))
759 return false;
760
761 return true;
762 }
763 EXPORT_SYMBOL(ttm_bo_eviction_valuable);
764
765 /**
766 * Check the target bo is allowable to be evicted or swapout, including cases:
767 *
768 * a. if share same reservation object with ctx->resv, have assumption
769 * reservation objects should already be locked, so not lock again and
770 * return true directly when either the opreation allow_reserved_eviction
771 * or the target bo already is in delayed free list;
772 *
773 * b. Otherwise, trylock it.
774 */
775 static bool ttm_bo_evict_swapout_allowable(struct ttm_buffer_object *bo,
776 struct ttm_operation_ctx *ctx, bool *locked, bool *busy)
777 {
778 bool ret = false;
779
780 if (bo->resv == ctx->resv) {
781 reservation_object_assert_held(bo->resv);
782 if (ctx->flags & TTM_OPT_FLAG_ALLOW_RES_EVICT
783 || !list_empty(&bo->ddestroy))
784 ret = true;
785 *locked = false;
786 if (busy)
787 *busy = false;
788 } else {
789 ret = reservation_object_trylock(bo->resv);
790 *locked = ret;
791 if (busy)
792 *busy = !ret;
793 }
794
795 return ret;
796 }
797
798 /**
799 * ttm_mem_evict_wait_busy - wait for a busy BO to become available
800 *
801 * @busy_bo: BO which couldn't be locked with trylock
802 * @ctx: operation context
803 * @ticket: acquire ticket
804 *
805 * Try to lock a busy buffer object to avoid failing eviction.
806 */
807 static int ttm_mem_evict_wait_busy(struct ttm_buffer_object *busy_bo,
808 struct ttm_operation_ctx *ctx,
809 struct ww_acquire_ctx *ticket)
810 {
811 int r;
812
813 if (!busy_bo || !ticket)
814 return -EBUSY;
815
816 if (ctx->interruptible)
817 r = reservation_object_lock_interruptible(busy_bo->resv,
818 ticket);
819 else
820 r = reservation_object_lock(busy_bo->resv, ticket);
821
822 /*
823 * TODO: It would be better to keep the BO locked until allocation is at
824 * least tried one more time, but that would mean a much larger rework
825 * of TTM.
826 */
827 if (!r)
828 reservation_object_unlock(busy_bo->resv);
829
830 return r == -EDEADLK ? -EBUSY : r;
831 }
832
833 static int ttm_mem_evict_first(struct ttm_bo_device *bdev,
834 uint32_t mem_type,
835 const struct ttm_place *place,
836 struct ttm_operation_ctx *ctx,
837 struct ww_acquire_ctx *ticket)
838 {
839 struct ttm_buffer_object *bo = NULL, *busy_bo = NULL;
840 struct ttm_bo_global *glob = bdev->glob;
841 struct ttm_mem_type_manager *man = &bdev->man[mem_type];
842 bool locked = false;
843 unsigned i;
844 int ret;
845
846 spin_lock(&glob->lru_lock);
847 for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i) {
848 list_for_each_entry(bo, &man->lru[i], lru) {
849 bool busy;
850
851 if (!ttm_bo_evict_swapout_allowable(bo, ctx, &locked,
852 &busy)) {
853 if (busy && !busy_bo &&
854 bo->resv->lock.ctx != ticket)
855 busy_bo = bo;
856 continue;
857 }
858
859 if (place && !bdev->driver->eviction_valuable(bo,
860 place)) {
861 if (locked)
862 reservation_object_unlock(bo->resv);
863 continue;
864 }
865 break;
866 }
867
868 /* If the inner loop terminated early, we have our candidate */
869 if (&bo->lru != &man->lru[i])
870 break;
871
872 bo = NULL;
873 }
874
875 if (!bo) {
876 if (busy_bo)
877 ttm_bo_get(busy_bo);
878 spin_unlock(&glob->lru_lock);
879 ret = ttm_mem_evict_wait_busy(busy_bo, ctx, ticket);
880 if (busy_bo)
881 ttm_bo_put(busy_bo);
882 return ret;
883 }
884
885 kref_get(&bo->list_kref);
886
887 if (!list_empty(&bo->ddestroy)) {
888 ret = ttm_bo_cleanup_refs(bo, ctx->interruptible,
889 ctx->no_wait_gpu, locked);
890 kref_put(&bo->list_kref, ttm_bo_release_list);
891 return ret;
892 }
893
894 ttm_bo_del_from_lru(bo);
895 spin_unlock(&glob->lru_lock);
896
897 ret = ttm_bo_evict(bo, ctx);
898 if (locked) {
899 ttm_bo_unreserve(bo);
900 } else {
901 spin_lock(&glob->lru_lock);
902 ttm_bo_add_to_lru(bo);
903 spin_unlock(&glob->lru_lock);
904 }
905
906 kref_put(&bo->list_kref, ttm_bo_release_list);
907 return ret;
908 }
909
910 void ttm_bo_mem_put(struct ttm_buffer_object *bo, struct ttm_mem_reg *mem)
911 {
912 struct ttm_mem_type_manager *man = &bo->bdev->man[mem->mem_type];
913
914 if (mem->mm_node)
915 (*man->func->put_node)(man, mem);
916 }
917 EXPORT_SYMBOL(ttm_bo_mem_put);
918
919 /**
920 * Add the last move fence to the BO and reserve a new shared slot.
921 */
922 static int ttm_bo_add_move_fence(struct ttm_buffer_object *bo,
923 struct ttm_mem_type_manager *man,
924 struct ttm_mem_reg *mem)
925 {
926 struct dma_fence *fence;
927 int ret;
928
929 spin_lock(&man->move_lock);
930 fence = dma_fence_get(man->move);
931 spin_unlock(&man->move_lock);
932
933 if (fence) {
934 reservation_object_add_shared_fence(bo->resv, fence);
935
936 ret = reservation_object_reserve_shared(bo->resv, 1);
937 if (unlikely(ret)) {
938 dma_fence_put(fence);
939 return ret;
940 }
941
942 dma_fence_put(bo->moving);
943 bo->moving = fence;
944 }
945
946 return 0;
947 }
948
949 /**
950 * Repeatedly evict memory from the LRU for @mem_type until we create enough
951 * space, or we've evicted everything and there isn't enough space.
952 */
953 static int ttm_bo_mem_force_space(struct ttm_buffer_object *bo,
954 const struct ttm_place *place,
955 struct ttm_mem_reg *mem,
956 struct ttm_operation_ctx *ctx)
957 {
958 struct ttm_bo_device *bdev = bo->bdev;
959 struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
960 int ret;
961
962 do {
963 ret = (*man->func->get_node)(man, bo, place, mem);
964 if (unlikely(ret != 0))
965 return ret;
966 if (mem->mm_node)
967 break;
968 ret = ttm_mem_evict_first(bdev, mem->mem_type, place, ctx,
969 bo->resv->lock.ctx);
970 if (unlikely(ret != 0))
971 return ret;
972 } while (1);
973
974 return ttm_bo_add_move_fence(bo, man, mem);
975 }
976
977 static uint32_t ttm_bo_select_caching(struct ttm_mem_type_manager *man,
978 uint32_t cur_placement,
979 uint32_t proposed_placement)
980 {
981 uint32_t caching = proposed_placement & TTM_PL_MASK_CACHING;
982 uint32_t result = proposed_placement & ~TTM_PL_MASK_CACHING;
983
984 /**
985 * Keep current caching if possible.
986 */
987
988 if ((cur_placement & caching) != 0)
989 result |= (cur_placement & caching);
990 else if ((man->default_caching & caching) != 0)
991 result |= man->default_caching;
992 else if ((TTM_PL_FLAG_CACHED & caching) != 0)
993 result |= TTM_PL_FLAG_CACHED;
994 else if ((TTM_PL_FLAG_WC & caching) != 0)
995 result |= TTM_PL_FLAG_WC;
996 else if ((TTM_PL_FLAG_UNCACHED & caching) != 0)
997 result |= TTM_PL_FLAG_UNCACHED;
998
999 return result;
1000 }
1001
1002 static bool ttm_bo_mt_compatible(struct ttm_mem_type_manager *man,
1003 uint32_t mem_type,
1004 const struct ttm_place *place,
1005 uint32_t *masked_placement)
1006 {
1007 uint32_t cur_flags = ttm_bo_type_flags(mem_type);
1008
1009 if ((cur_flags & place->flags & TTM_PL_MASK_MEM) == 0)
1010 return false;
1011
1012 if ((place->flags & man->available_caching) == 0)
1013 return false;
1014
1015 cur_flags |= (place->flags & man->available_caching);
1016
1017 *masked_placement = cur_flags;
1018 return true;
1019 }
1020
1021 /**
1022 * ttm_bo_mem_placement - check if placement is compatible
1023 * @bo: BO to find memory for
1024 * @place: where to search
1025 * @mem: the memory object to fill in
1026 * @ctx: operation context
1027 *
1028 * Check if placement is compatible and fill in mem structure.
1029 * Returns -EBUSY if placement won't work or negative error code.
1030 * 0 when placement can be used.
1031 */
1032 static int ttm_bo_mem_placement(struct ttm_buffer_object *bo,
1033 const struct ttm_place *place,
1034 struct ttm_mem_reg *mem,
1035 struct ttm_operation_ctx *ctx)
1036 {
1037 struct ttm_bo_device *bdev = bo->bdev;
1038 uint32_t mem_type = TTM_PL_SYSTEM;
1039 struct ttm_mem_type_manager *man;
1040 uint32_t cur_flags = 0;
1041 int ret;
1042
1043 ret = ttm_mem_type_from_place(place, &mem_type);
1044 if (ret)
1045 return ret;
1046
1047 man = &bdev->man[mem_type];
1048 if (!man->has_type || !man->use_type)
1049 return -EBUSY;
1050
1051 if (!ttm_bo_mt_compatible(man, mem_type, place, &cur_flags))
1052 return -EBUSY;
1053
1054 cur_flags = ttm_bo_select_caching(man, bo->mem.placement, cur_flags);
1055 /*
1056 * Use the access and other non-mapping-related flag bits from
1057 * the memory placement flags to the current flags
1058 */
1059 ttm_flag_masked(&cur_flags, place->flags, ~TTM_PL_MASK_MEMTYPE);
1060
1061 mem->mem_type = mem_type;
1062 mem->placement = cur_flags;
1063
1064 if (bo->mem.mem_type < mem_type && !list_empty(&bo->lru)) {
1065 spin_lock(&bo->bdev->glob->lru_lock);
1066 ttm_bo_del_from_lru(bo);
1067 ttm_bo_add_mem_to_lru(bo, mem);
1068 spin_unlock(&bo->bdev->glob->lru_lock);
1069 }
1070
1071 return 0;
1072 }
1073
1074 /**
1075 * Creates space for memory region @mem according to its type.
1076 *
1077 * This function first searches for free space in compatible memory types in
1078 * the priority order defined by the driver. If free space isn't found, then
1079 * ttm_bo_mem_force_space is attempted in priority order to evict and find
1080 * space.
1081 */
1082 int ttm_bo_mem_space(struct ttm_buffer_object *bo,
1083 struct ttm_placement *placement,
1084 struct ttm_mem_reg *mem,
1085 struct ttm_operation_ctx *ctx)
1086 {
1087 struct ttm_bo_device *bdev = bo->bdev;
1088 bool type_found = false;
1089 int i, ret;
1090
1091 ret = reservation_object_reserve_shared(bo->resv, 1);
1092 if (unlikely(ret))
1093 return ret;
1094
1095 mem->mm_node = NULL;
1096 for (i = 0; i < placement->num_placement; ++i) {
1097 const struct ttm_place *place = &placement->placement[i];
1098 struct ttm_mem_type_manager *man;
1099
1100 ret = ttm_bo_mem_placement(bo, place, mem, ctx);
1101 if (ret == -EBUSY)
1102 continue;
1103 if (ret)
1104 goto error;
1105
1106 type_found = true;
1107 mem->mm_node = NULL;
1108 if (mem->mem_type == TTM_PL_SYSTEM)
1109 return 0;
1110
1111 man = &bdev->man[mem->mem_type];
1112 ret = (*man->func->get_node)(man, bo, place, mem);
1113 if (unlikely(ret))
1114 goto error;
1115
1116 if (mem->mm_node) {
1117 ret = ttm_bo_add_move_fence(bo, man, mem);
1118 if (unlikely(ret)) {
1119 (*man->func->put_node)(man, mem);
1120 goto error;
1121 }
1122 return 0;
1123 }
1124 }
1125
1126 for (i = 0; i < placement->num_busy_placement; ++i) {
1127 const struct ttm_place *place = &placement->busy_placement[i];
1128
1129 ret = ttm_bo_mem_placement(bo, place, mem, ctx);
1130 if (ret == -EBUSY)
1131 continue;
1132 if (ret)
1133 goto error;
1134
1135 type_found = true;
1136 mem->mm_node = NULL;
1137 if (mem->mem_type == TTM_PL_SYSTEM)
1138 return 0;
1139
1140 ret = ttm_bo_mem_force_space(bo, place, mem, ctx);
1141 if (ret == 0 && mem->mm_node)
1142 return 0;
1143
1144 if (ret && ret != -EBUSY)
1145 goto error;
1146 }
1147
1148 ret = -ENOMEM;
1149 if (!type_found) {
1150 pr_err(TTM_PFX "No compatible memory type found\n");
1151 ret = -EINVAL;
1152 }
1153
1154 error:
1155 if (bo->mem.mem_type == TTM_PL_SYSTEM && !list_empty(&bo->lru)) {
1156 spin_lock(&bo->bdev->glob->lru_lock);
1157 ttm_bo_move_to_lru_tail(bo, NULL);
1158 spin_unlock(&bo->bdev->glob->lru_lock);
1159 }
1160
1161 return ret;
1162 }
1163 EXPORT_SYMBOL(ttm_bo_mem_space);
1164
1165 static int ttm_bo_move_buffer(struct ttm_buffer_object *bo,
1166 struct ttm_placement *placement,
1167 struct ttm_operation_ctx *ctx)
1168 {
1169 int ret = 0;
1170 struct ttm_mem_reg mem;
1171
1172 reservation_object_assert_held(bo->resv);
1173
1174 mem.num_pages = bo->num_pages;
1175 mem.size = mem.num_pages << PAGE_SHIFT;
1176 mem.page_alignment = bo->mem.page_alignment;
1177 mem.bus.io_reserved_vm = false;
1178 mem.bus.io_reserved_count = 0;
1179 /*
1180 * Determine where to move the buffer.
1181 */
1182 ret = ttm_bo_mem_space(bo, placement, &mem, ctx);
1183 if (ret)
1184 goto out_unlock;
1185 ret = ttm_bo_handle_move_mem(bo, &mem, false, ctx);
1186 out_unlock:
1187 if (ret && mem.mm_node)
1188 ttm_bo_mem_put(bo, &mem);
1189 return ret;
1190 }
1191
1192 static bool ttm_bo_places_compat(const struct ttm_place *places,
1193 unsigned num_placement,
1194 struct ttm_mem_reg *mem,
1195 uint32_t *new_flags)
1196 {
1197 unsigned i;
1198
1199 for (i = 0; i < num_placement; i++) {
1200 const struct ttm_place *heap = &places[i];
1201
1202 if (mem->mm_node && (mem->start < heap->fpfn ||
1203 (heap->lpfn != 0 && (mem->start + mem->num_pages) > heap->lpfn)))
1204 continue;
1205
1206 *new_flags = heap->flags;
1207 if ((*new_flags & mem->placement & TTM_PL_MASK_CACHING) &&
1208 (*new_flags & mem->placement & TTM_PL_MASK_MEM) &&
1209 (!(*new_flags & TTM_PL_FLAG_CONTIGUOUS) ||
1210 (mem->placement & TTM_PL_FLAG_CONTIGUOUS)))
1211 return true;
1212 }
1213 return false;
1214 }
1215
1216 bool ttm_bo_mem_compat(struct ttm_placement *placement,
1217 struct ttm_mem_reg *mem,
1218 uint32_t *new_flags)
1219 {
1220 if (ttm_bo_places_compat(placement->placement, placement->num_placement,
1221 mem, new_flags))
1222 return true;
1223
1224 if ((placement->busy_placement != placement->placement ||
1225 placement->num_busy_placement > placement->num_placement) &&
1226 ttm_bo_places_compat(placement->busy_placement,
1227 placement->num_busy_placement,
1228 mem, new_flags))
1229 return true;
1230
1231 return false;
1232 }
1233 EXPORT_SYMBOL(ttm_bo_mem_compat);
1234
1235 int ttm_bo_validate(struct ttm_buffer_object *bo,
1236 struct ttm_placement *placement,
1237 struct ttm_operation_ctx *ctx)
1238 {
1239 int ret;
1240 uint32_t new_flags;
1241
1242 reservation_object_assert_held(bo->resv);
1243 /*
1244 * Check whether we need to move buffer.
1245 */
1246 if (!ttm_bo_mem_compat(placement, &bo->mem, &new_flags)) {
1247 ret = ttm_bo_move_buffer(bo, placement, ctx);
1248 if (ret)
1249 return ret;
1250 } else {
1251 /*
1252 * Use the access and other non-mapping-related flag bits from
1253 * the compatible memory placement flags to the active flags
1254 */
1255 ttm_flag_masked(&bo->mem.placement, new_flags,
1256 ~TTM_PL_MASK_MEMTYPE);
1257 }
1258 /*
1259 * We might need to add a TTM.
1260 */
1261 if (bo->mem.mem_type == TTM_PL_SYSTEM && bo->ttm == NULL) {
1262 ret = ttm_tt_create(bo, true);
1263 if (ret)
1264 return ret;
1265 }
1266 return 0;
1267 }
1268 EXPORT_SYMBOL(ttm_bo_validate);
1269
1270 int ttm_bo_init_reserved(struct ttm_bo_device *bdev,
1271 struct ttm_buffer_object *bo,
1272 unsigned long size,
1273 enum ttm_bo_type type,
1274 struct ttm_placement *placement,
1275 uint32_t page_alignment,
1276 struct ttm_operation_ctx *ctx,
1277 size_t acc_size,
1278 struct sg_table *sg,
1279 struct reservation_object *resv,
1280 void (*destroy) (struct ttm_buffer_object *))
1281 {
1282 int ret = 0;
1283 unsigned long num_pages;
1284 struct ttm_mem_global *mem_glob = bdev->glob->mem_glob;
1285 bool locked;
1286
1287 ret = ttm_mem_global_alloc(mem_glob, acc_size, ctx);
1288 if (ret) {
1289 pr_err("Out of kernel memory\n");
1290 if (destroy)
1291 (*destroy)(bo);
1292 else
1293 kfree(bo);
1294 return -ENOMEM;
1295 }
1296
1297 num_pages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
1298 if (num_pages == 0) {
1299 pr_err("Illegal buffer object size\n");
1300 if (destroy)
1301 (*destroy)(bo);
1302 else
1303 kfree(bo);
1304 ttm_mem_global_free(mem_glob, acc_size);
1305 return -EINVAL;
1306 }
1307 bo->destroy = destroy ? destroy : ttm_bo_default_destroy;
1308
1309 kref_init(&bo->kref);
1310 kref_init(&bo->list_kref);
1311 atomic_set(&bo->cpu_writers, 0);
1312 INIT_LIST_HEAD(&bo->lru);
1313 INIT_LIST_HEAD(&bo->ddestroy);
1314 INIT_LIST_HEAD(&bo->swap);
1315 INIT_LIST_HEAD(&bo->io_reserve_lru);
1316 mutex_init(&bo->wu_mutex);
1317 bo->bdev = bdev;
1318 bo->type = type;
1319 bo->num_pages = num_pages;
1320 bo->mem.size = num_pages << PAGE_SHIFT;
1321 bo->mem.mem_type = TTM_PL_SYSTEM;
1322 bo->mem.num_pages = bo->num_pages;
1323 bo->mem.mm_node = NULL;
1324 bo->mem.page_alignment = page_alignment;
1325 bo->mem.bus.io_reserved_vm = false;
1326 bo->mem.bus.io_reserved_count = 0;
1327 bo->moving = NULL;
1328 bo->mem.placement = (TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED);
1329 bo->acc_size = acc_size;
1330 bo->sg = sg;
1331 if (resv) {
1332 bo->resv = resv;
1333 reservation_object_assert_held(bo->resv);
1334 } else {
1335 bo->resv = &bo->ttm_resv;
1336 }
1337 reservation_object_init(&bo->ttm_resv);
1338 atomic_inc(&bo->bdev->glob->bo_count);
1339 drm_vma_node_reset(&bo->vma_node);
1340
1341 /*
1342 * For ttm_bo_type_device buffers, allocate
1343 * address space from the device.
1344 */
1345 if (bo->type == ttm_bo_type_device ||
1346 bo->type == ttm_bo_type_sg)
1347 ret = drm_vma_offset_add(&bdev->vma_manager, &bo->vma_node,
1348 bo->mem.num_pages);
1349
1350 /* passed reservation objects should already be locked,
1351 * since otherwise lockdep will be angered in radeon.
1352 */
1353 if (!resv) {
1354 locked = reservation_object_trylock(bo->resv);
1355 WARN_ON(!locked);
1356 }
1357
1358 if (likely(!ret))
1359 ret = ttm_bo_validate(bo, placement, ctx);
1360
1361 if (unlikely(ret)) {
1362 if (!resv)
1363 ttm_bo_unreserve(bo);
1364
1365 ttm_bo_put(bo);
1366 return ret;
1367 }
1368
1369 if (resv && !(bo->mem.placement & TTM_PL_FLAG_NO_EVICT)) {
1370 spin_lock(&bdev->glob->lru_lock);
1371 ttm_bo_add_to_lru(bo);
1372 spin_unlock(&bdev->glob->lru_lock);
1373 }
1374
1375 return ret;
1376 }
1377 EXPORT_SYMBOL(ttm_bo_init_reserved);
1378
1379 int ttm_bo_init(struct ttm_bo_device *bdev,
1380 struct ttm_buffer_object *bo,
1381 unsigned long size,
1382 enum ttm_bo_type type,
1383 struct ttm_placement *placement,
1384 uint32_t page_alignment,
1385 bool interruptible,
1386 size_t acc_size,
1387 struct sg_table *sg,
1388 struct reservation_object *resv,
1389 void (*destroy) (struct ttm_buffer_object *))
1390 {
1391 struct ttm_operation_ctx ctx = { interruptible, false };
1392 int ret;
1393
1394 ret = ttm_bo_init_reserved(bdev, bo, size, type, placement,
1395 page_alignment, &ctx, acc_size,
1396 sg, resv, destroy);
1397 if (ret)
1398 return ret;
1399
1400 if (!resv)
1401 ttm_bo_unreserve(bo);
1402
1403 return 0;
1404 }
1405 EXPORT_SYMBOL(ttm_bo_init);
1406
1407 size_t ttm_bo_acc_size(struct ttm_bo_device *bdev,
1408 unsigned long bo_size,
1409 unsigned struct_size)
1410 {
1411 unsigned npages = (PAGE_ALIGN(bo_size)) >> PAGE_SHIFT;
1412 size_t size = 0;
1413
1414 size += ttm_round_pot(struct_size);
1415 size += ttm_round_pot(npages * sizeof(void *));
1416 size += ttm_round_pot(sizeof(struct ttm_tt));
1417 return size;
1418 }
1419 EXPORT_SYMBOL(ttm_bo_acc_size);
1420
1421 size_t ttm_bo_dma_acc_size(struct ttm_bo_device *bdev,
1422 unsigned long bo_size,
1423 unsigned struct_size)
1424 {
1425 unsigned npages = (PAGE_ALIGN(bo_size)) >> PAGE_SHIFT;
1426 size_t size = 0;
1427
1428 size += ttm_round_pot(struct_size);
1429 size += ttm_round_pot(npages * (2*sizeof(void *) + sizeof(dma_addr_t)));
1430 size += ttm_round_pot(sizeof(struct ttm_dma_tt));
1431 return size;
1432 }
1433 EXPORT_SYMBOL(ttm_bo_dma_acc_size);
1434
1435 int ttm_bo_create(struct ttm_bo_device *bdev,
1436 unsigned long size,
1437 enum ttm_bo_type type,
1438 struct ttm_placement *placement,
1439 uint32_t page_alignment,
1440 bool interruptible,
1441 struct ttm_buffer_object **p_bo)
1442 {
1443 struct ttm_buffer_object *bo;
1444 size_t acc_size;
1445 int ret;
1446
1447 bo = kzalloc(sizeof(*bo), GFP_KERNEL);
1448 if (unlikely(bo == NULL))
1449 return -ENOMEM;
1450
1451 acc_size = ttm_bo_acc_size(bdev, size, sizeof(struct ttm_buffer_object));
1452 ret = ttm_bo_init(bdev, bo, size, type, placement, page_alignment,
1453 interruptible, acc_size,
1454 NULL, NULL, NULL);
1455 if (likely(ret == 0))
1456 *p_bo = bo;
1457
1458 return ret;
1459 }
1460 EXPORT_SYMBOL(ttm_bo_create);
1461
1462 static int ttm_bo_force_list_clean(struct ttm_bo_device *bdev,
1463 unsigned mem_type)
1464 {
1465 struct ttm_operation_ctx ctx = {
1466 .interruptible = false,
1467 .no_wait_gpu = false,
1468 .flags = TTM_OPT_FLAG_FORCE_ALLOC
1469 };
1470 struct ttm_mem_type_manager *man = &bdev->man[mem_type];
1471 struct ttm_bo_global *glob = bdev->glob;
1472 struct dma_fence *fence;
1473 int ret;
1474 unsigned i;
1475
1476 /*
1477 * Can't use standard list traversal since we're unlocking.
1478 */
1479
1480 spin_lock(&glob->lru_lock);
1481 for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i) {
1482 while (!list_empty(&man->lru[i])) {
1483 spin_unlock(&glob->lru_lock);
1484 ret = ttm_mem_evict_first(bdev, mem_type, NULL, &ctx,
1485 NULL);
1486 if (ret)
1487 return ret;
1488 spin_lock(&glob->lru_lock);
1489 }
1490 }
1491 spin_unlock(&glob->lru_lock);
1492
1493 spin_lock(&man->move_lock);
1494 fence = dma_fence_get(man->move);
1495 spin_unlock(&man->move_lock);
1496
1497 if (fence) {
1498 ret = dma_fence_wait(fence, false);
1499 dma_fence_put(fence);
1500 if (ret)
1501 return ret;
1502 }
1503
1504 return 0;
1505 }
1506
1507 int ttm_bo_clean_mm(struct ttm_bo_device *bdev, unsigned mem_type)
1508 {
1509 struct ttm_mem_type_manager *man;
1510 int ret = -EINVAL;
1511
1512 if (mem_type >= TTM_NUM_MEM_TYPES) {
1513 pr_err("Illegal memory type %d\n", mem_type);
1514 return ret;
1515 }
1516 man = &bdev->man[mem_type];
1517
1518 if (!man->has_type) {
1519 pr_err("Trying to take down uninitialized memory manager type %u\n",
1520 mem_type);
1521 return ret;
1522 }
1523
1524 man->use_type = false;
1525 man->has_type = false;
1526
1527 ret = 0;
1528 if (mem_type > 0) {
1529 ret = ttm_bo_force_list_clean(bdev, mem_type);
1530 if (ret) {
1531 pr_err("Cleanup eviction failed\n");
1532 return ret;
1533 }
1534
1535 ret = (*man->func->takedown)(man);
1536 }
1537
1538 dma_fence_put(man->move);
1539 man->move = NULL;
1540
1541 return ret;
1542 }
1543 EXPORT_SYMBOL(ttm_bo_clean_mm);
1544
1545 int ttm_bo_evict_mm(struct ttm_bo_device *bdev, unsigned mem_type)
1546 {
1547 struct ttm_mem_type_manager *man = &bdev->man[mem_type];
1548
1549 if (mem_type == 0 || mem_type >= TTM_NUM_MEM_TYPES) {
1550 pr_err("Illegal memory manager memory type %u\n", mem_type);
1551 return -EINVAL;
1552 }
1553
1554 if (!man->has_type) {
1555 pr_err("Memory type %u has not been initialized\n", mem_type);
1556 return 0;
1557 }
1558
1559 return ttm_bo_force_list_clean(bdev, mem_type);
1560 }
1561 EXPORT_SYMBOL(ttm_bo_evict_mm);
1562
1563 int ttm_bo_init_mm(struct ttm_bo_device *bdev, unsigned type,
1564 unsigned long p_size)
1565 {
1566 int ret;
1567 struct ttm_mem_type_manager *man;
1568 unsigned i;
1569
1570 BUG_ON(type >= TTM_NUM_MEM_TYPES);
1571 man = &bdev->man[type];
1572 BUG_ON(man->has_type);
1573 man->io_reserve_fastpath = true;
1574 man->use_io_reserve_lru = false;
1575 mutex_init(&man->io_reserve_mutex);
1576 spin_lock_init(&man->move_lock);
1577 INIT_LIST_HEAD(&man->io_reserve_lru);
1578
1579 ret = bdev->driver->init_mem_type(bdev, type, man);
1580 if (ret)
1581 return ret;
1582 man->bdev = bdev;
1583
1584 if (type != TTM_PL_SYSTEM) {
1585 ret = (*man->func->init)(man, p_size);
1586 if (ret)
1587 return ret;
1588 }
1589 man->has_type = true;
1590 man->use_type = true;
1591 man->size = p_size;
1592
1593 for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i)
1594 INIT_LIST_HEAD(&man->lru[i]);
1595 man->move = NULL;
1596
1597 return 0;
1598 }
1599 EXPORT_SYMBOL(ttm_bo_init_mm);
1600
1601 static void ttm_bo_global_kobj_release(struct kobject *kobj)
1602 {
1603 struct ttm_bo_global *glob =
1604 container_of(kobj, struct ttm_bo_global, kobj);
1605
1606 __free_page(glob->dummy_read_page);
1607 }
1608
1609 static void ttm_bo_global_release(void)
1610 {
1611 struct ttm_bo_global *glob = &ttm_bo_glob;
1612
1613 mutex_lock(&ttm_global_mutex);
1614 if (--ttm_bo_glob_use_count > 0)
1615 goto out;
1616
1617 kobject_del(&glob->kobj);
1618 kobject_put(&glob->kobj);
1619 ttm_mem_global_release(&ttm_mem_glob);
1620 memset(glob, 0, sizeof(*glob));
1621 out:
1622 mutex_unlock(&ttm_global_mutex);
1623 }
1624
1625 static int ttm_bo_global_init(void)
1626 {
1627 struct ttm_bo_global *glob = &ttm_bo_glob;
1628 int ret = 0;
1629 unsigned i;
1630
1631 mutex_lock(&ttm_global_mutex);
1632 if (++ttm_bo_glob_use_count > 1)
1633 goto out;
1634
1635 ret = ttm_mem_global_init(&ttm_mem_glob);
1636 if (ret)
1637 goto out;
1638
1639 spin_lock_init(&glob->lru_lock);
1640 glob->mem_glob = &ttm_mem_glob;
1641 glob->mem_glob->bo_glob = glob;
1642 glob->dummy_read_page = alloc_page(__GFP_ZERO | GFP_DMA32);
1643
1644 if (unlikely(glob->dummy_read_page == NULL)) {
1645 ret = -ENOMEM;
1646 goto out;
1647 }
1648
1649 for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i)
1650 INIT_LIST_HEAD(&glob->swap_lru[i]);
1651 INIT_LIST_HEAD(&glob->device_list);
1652 atomic_set(&glob->bo_count, 0);
1653
1654 ret = kobject_init_and_add(
1655 &glob->kobj, &ttm_bo_glob_kobj_type, ttm_get_kobj(), "buffer_objects");
1656 if (unlikely(ret != 0))
1657 kobject_put(&glob->kobj);
1658 out:
1659 mutex_unlock(&ttm_global_mutex);
1660 return ret;
1661 }
1662
1663 int ttm_bo_device_release(struct ttm_bo_device *bdev)
1664 {
1665 int ret = 0;
1666 unsigned i = TTM_NUM_MEM_TYPES;
1667 struct ttm_mem_type_manager *man;
1668 struct ttm_bo_global *glob = bdev->glob;
1669
1670 while (i--) {
1671 man = &bdev->man[i];
1672 if (man->has_type) {
1673 man->use_type = false;
1674 if ((i != TTM_PL_SYSTEM) && ttm_bo_clean_mm(bdev, i)) {
1675 ret = -EBUSY;
1676 pr_err("DRM memory manager type %d is not clean\n",
1677 i);
1678 }
1679 man->has_type = false;
1680 }
1681 }
1682
1683 mutex_lock(&ttm_global_mutex);
1684 list_del(&bdev->device_list);
1685 mutex_unlock(&ttm_global_mutex);
1686
1687 cancel_delayed_work_sync(&bdev->wq);
1688
1689 if (ttm_bo_delayed_delete(bdev, true))
1690 pr_debug("Delayed destroy list was clean\n");
1691
1692 spin_lock(&glob->lru_lock);
1693 for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i)
1694 if (list_empty(&bdev->man[0].lru[0]))
1695 pr_debug("Swap list %d was clean\n", i);
1696 spin_unlock(&glob->lru_lock);
1697
1698 drm_vma_offset_manager_destroy(&bdev->vma_manager);
1699
1700 if (!ret)
1701 ttm_bo_global_release();
1702
1703 return ret;
1704 }
1705 EXPORT_SYMBOL(ttm_bo_device_release);
1706
1707 int ttm_bo_device_init(struct ttm_bo_device *bdev,
1708 struct ttm_bo_driver *driver,
1709 struct address_space *mapping,
1710 bool need_dma32)
1711 {
1712 struct ttm_bo_global *glob = &ttm_bo_glob;
1713 int ret;
1714
1715 ret = ttm_bo_global_init();
1716 if (ret)
1717 return ret;
1718
1719 bdev->driver = driver;
1720
1721 memset(bdev->man, 0, sizeof(bdev->man));
1722
1723 /*
1724 * Initialize the system memory buffer type.
1725 * Other types need to be driver / IOCTL initialized.
1726 */
1727 ret = ttm_bo_init_mm(bdev, TTM_PL_SYSTEM, 0);
1728 if (unlikely(ret != 0))
1729 goto out_no_sys;
1730
1731 drm_vma_offset_manager_init(&bdev->vma_manager,
1732 DRM_FILE_PAGE_OFFSET_START,
1733 DRM_FILE_PAGE_OFFSET_SIZE);
1734 INIT_DELAYED_WORK(&bdev->wq, ttm_bo_delayed_workqueue);
1735 INIT_LIST_HEAD(&bdev->ddestroy);
1736 bdev->dev_mapping = mapping;
1737 bdev->glob = glob;
1738 bdev->need_dma32 = need_dma32;
1739 mutex_lock(&ttm_global_mutex);
1740 list_add_tail(&bdev->device_list, &glob->device_list);
1741 mutex_unlock(&ttm_global_mutex);
1742
1743 return 0;
1744 out_no_sys:
1745 ttm_bo_global_release();
1746 return ret;
1747 }
1748 EXPORT_SYMBOL(ttm_bo_device_init);
1749
1750 /*
1751 * buffer object vm functions.
1752 */
1753
1754 bool ttm_mem_reg_is_pci(struct ttm_bo_device *bdev, struct ttm_mem_reg *mem)
1755 {
1756 struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
1757
1758 if (!(man->flags & TTM_MEMTYPE_FLAG_FIXED)) {
1759 if (mem->mem_type == TTM_PL_SYSTEM)
1760 return false;
1761
1762 if (man->flags & TTM_MEMTYPE_FLAG_CMA)
1763 return false;
1764
1765 if (mem->placement & TTM_PL_FLAG_CACHED)
1766 return false;
1767 }
1768 return true;
1769 }
1770
1771 void ttm_bo_unmap_virtual_locked(struct ttm_buffer_object *bo)
1772 {
1773 struct ttm_bo_device *bdev = bo->bdev;
1774
1775 drm_vma_node_unmap(&bo->vma_node, bdev->dev_mapping);
1776 ttm_mem_io_free_vm(bo);
1777 }
1778
1779 void ttm_bo_unmap_virtual(struct ttm_buffer_object *bo)
1780 {
1781 struct ttm_bo_device *bdev = bo->bdev;
1782 struct ttm_mem_type_manager *man = &bdev->man[bo->mem.mem_type];
1783
1784 ttm_mem_io_lock(man, false);
1785 ttm_bo_unmap_virtual_locked(bo);
1786 ttm_mem_io_unlock(man);
1787 }
1788
1789
1790 EXPORT_SYMBOL(ttm_bo_unmap_virtual);
1791
1792 int ttm_bo_wait(struct ttm_buffer_object *bo,
1793 bool interruptible, bool no_wait)
1794 {
1795 long timeout = 15 * HZ;
1796
1797 if (no_wait) {
1798 if (reservation_object_test_signaled_rcu(bo->resv, true))
1799 return 0;
1800 else
1801 return -EBUSY;
1802 }
1803
1804 timeout = reservation_object_wait_timeout_rcu(bo->resv, true,
1805 interruptible, timeout);
1806 if (timeout < 0)
1807 return timeout;
1808
1809 if (timeout == 0)
1810 return -EBUSY;
1811
1812 reservation_object_add_excl_fence(bo->resv, NULL);
1813 return 0;
1814 }
1815 EXPORT_SYMBOL(ttm_bo_wait);
1816
1817 int ttm_bo_synccpu_write_grab(struct ttm_buffer_object *bo, bool no_wait)
1818 {
1819 int ret = 0;
1820
1821 /*
1822 * Using ttm_bo_reserve makes sure the lru lists are updated.
1823 */
1824
1825 ret = ttm_bo_reserve(bo, true, no_wait, NULL);
1826 if (unlikely(ret != 0))
1827 return ret;
1828 ret = ttm_bo_wait(bo, true, no_wait);
1829 if (likely(ret == 0))
1830 atomic_inc(&bo->cpu_writers);
1831 ttm_bo_unreserve(bo);
1832 return ret;
1833 }
1834 EXPORT_SYMBOL(ttm_bo_synccpu_write_grab);
1835
1836 void ttm_bo_synccpu_write_release(struct ttm_buffer_object *bo)
1837 {
1838 atomic_dec(&bo->cpu_writers);
1839 }
1840 EXPORT_SYMBOL(ttm_bo_synccpu_write_release);
1841
1842 /**
1843 * A buffer object shrink method that tries to swap out the first
1844 * buffer object on the bo_global::swap_lru list.
1845 */
1846 int ttm_bo_swapout(struct ttm_bo_global *glob, struct ttm_operation_ctx *ctx)
1847 {
1848 struct ttm_buffer_object *bo;
1849 int ret = -EBUSY;
1850 bool locked;
1851 unsigned i;
1852
1853 spin_lock(&glob->lru_lock);
1854 for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i) {
1855 list_for_each_entry(bo, &glob->swap_lru[i], swap) {
1856 if (ttm_bo_evict_swapout_allowable(bo, ctx, &locked,
1857 NULL)) {
1858 ret = 0;
1859 break;
1860 }
1861 }
1862 if (!ret)
1863 break;
1864 }
1865
1866 if (ret) {
1867 spin_unlock(&glob->lru_lock);
1868 return ret;
1869 }
1870
1871 kref_get(&bo->list_kref);
1872
1873 if (!list_empty(&bo->ddestroy)) {
1874 ret = ttm_bo_cleanup_refs(bo, false, false, locked);
1875 kref_put(&bo->list_kref, ttm_bo_release_list);
1876 return ret;
1877 }
1878
1879 ttm_bo_del_from_lru(bo);
1880 spin_unlock(&glob->lru_lock);
1881
1882 /**
1883 * Move to system cached
1884 */
1885
1886 if (bo->mem.mem_type != TTM_PL_SYSTEM ||
1887 bo->ttm->caching_state != tt_cached) {
1888 struct ttm_operation_ctx ctx = { false, false };
1889 struct ttm_mem_reg evict_mem;
1890
1891 evict_mem = bo->mem;
1892 evict_mem.mm_node = NULL;
1893 evict_mem.placement = TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED;
1894 evict_mem.mem_type = TTM_PL_SYSTEM;
1895
1896 ret = ttm_bo_handle_move_mem(bo, &evict_mem, true, &ctx);
1897 if (unlikely(ret != 0))
1898 goto out;
1899 }
1900
1901 /**
1902 * Make sure BO is idle.
1903 */
1904
1905 ret = ttm_bo_wait(bo, false, false);
1906 if (unlikely(ret != 0))
1907 goto out;
1908
1909 ttm_bo_unmap_virtual(bo);
1910
1911 /**
1912 * Swap out. Buffer will be swapped in again as soon as
1913 * anyone tries to access a ttm page.
1914 */
1915
1916 if (bo->bdev->driver->swap_notify)
1917 bo->bdev->driver->swap_notify(bo);
1918
1919 ret = ttm_tt_swapout(bo->ttm, bo->persistent_swap_storage);
1920 out:
1921
1922 /**
1923 *
1924 * Unreserve without putting on LRU to avoid swapping out an
1925 * already swapped buffer.
1926 */
1927 if (locked)
1928 reservation_object_unlock(bo->resv);
1929 kref_put(&bo->list_kref, ttm_bo_release_list);
1930 return ret;
1931 }
1932 EXPORT_SYMBOL(ttm_bo_swapout);
1933
1934 void ttm_bo_swapout_all(struct ttm_bo_device *bdev)
1935 {
1936 struct ttm_operation_ctx ctx = {
1937 .interruptible = false,
1938 .no_wait_gpu = false
1939 };
1940
1941 while (ttm_bo_swapout(bdev->glob, &ctx) == 0)
1942 ;
1943 }
1944 EXPORT_SYMBOL(ttm_bo_swapout_all);
1945
1946 /**
1947 * ttm_bo_wait_unreserved - interruptible wait for a buffer object to become
1948 * unreserved
1949 *
1950 * @bo: Pointer to buffer
1951 */
1952 int ttm_bo_wait_unreserved(struct ttm_buffer_object *bo)
1953 {
1954 int ret;
1955
1956 /*
1957 * In the absense of a wait_unlocked API,
1958 * Use the bo::wu_mutex to avoid triggering livelocks due to
1959 * concurrent use of this function. Note that this use of
1960 * bo::wu_mutex can go away if we change locking order to
1961 * mmap_sem -> bo::reserve.
1962 */
1963 ret = mutex_lock_interruptible(&bo->wu_mutex);
1964 if (unlikely(ret != 0))
1965 return -ERESTARTSYS;
1966 if (!ww_mutex_is_locked(&bo->resv->lock))
1967 goto out_unlock;
1968 ret = reservation_object_lock_interruptible(bo->resv, NULL);
1969 if (ret == -EINTR)
1970 ret = -ERESTARTSYS;
1971 if (unlikely(ret != 0))
1972 goto out_unlock;
1973 reservation_object_unlock(bo->resv);
1974
1975 out_unlock:
1976 mutex_unlock(&bo->wu_mutex);
1977 return ret;
1978 }
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