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1/**************************************************************************
2 *
3 * Copyright (c) 2006-2009 VMware, Inc., Palo Alto, CA., USA
4 * All Rights Reserved.
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a
7 * copy of this software and associated documentation files (the
8 * "Software"), to deal in the Software without restriction, including
9 * without limitation the rights to use, copy, modify, merge, publish,
10 * distribute, sub license, and/or sell copies of the Software, and to
11 * permit persons to whom the Software is furnished to do so, subject to
12 * the following conditions:
13 *
14 * The above copyright notice and this permission notice (including the
15 * next paragraph) shall be included in all copies or substantial portions
16 * of the Software.
17 *
18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
19 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
20 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
21 * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
22 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
23 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
24 * USE OR OTHER DEALINGS IN THE SOFTWARE.
25 *
26 **************************************************************************/
27/*
28 * Authors: Thomas Hellstrom <thellstrom-at-vmware-dot-com>
29 */
30
31#include "ttm/ttm_module.h"
32#include "ttm/ttm_bo_driver.h"
33#include "ttm/ttm_placement.h"
34#include <linux/jiffies.h>
35#include <linux/slab.h>
36#include <linux/sched.h>
37#include <linux/mm.h>
38#include <linux/file.h>
39#include <linux/module.h>
40#include <linux/atomic.h>
41
42#define TTM_ASSERT_LOCKED(param)
43#define TTM_DEBUG(fmt, arg...)
44#define TTM_BO_HASH_ORDER 13
45
46static int ttm_bo_setup_vm(struct ttm_buffer_object *bo);
47static int ttm_bo_swapout(struct ttm_mem_shrink *shrink);
48static void ttm_bo_global_kobj_release(struct kobject *kobj);
49
50static struct attribute ttm_bo_count = {
51 .name = "bo_count",
52 .mode = S_IRUGO
53};
54
55static inline int ttm_mem_type_from_flags(uint32_t flags, uint32_t *mem_type)
56{
57 int i;
58
59 for (i = 0; i <= TTM_PL_PRIV5; i++)
60 if (flags & (1 << i)) {
61 *mem_type = i;
62 return 0;
63 }
64 return -EINVAL;
65}
66
67static void ttm_mem_type_debug(struct ttm_bo_device *bdev, int mem_type)
68{
69 struct ttm_mem_type_manager *man = &bdev->man[mem_type];
70
71 printk(KERN_ERR TTM_PFX " has_type: %d\n", man->has_type);
72 printk(KERN_ERR TTM_PFX " use_type: %d\n", man->use_type);
73 printk(KERN_ERR TTM_PFX " flags: 0x%08X\n", man->flags);
74 printk(KERN_ERR TTM_PFX " gpu_offset: 0x%08lX\n", man->gpu_offset);
75 printk(KERN_ERR TTM_PFX " size: %llu\n", man->size);
76 printk(KERN_ERR TTM_PFX " available_caching: 0x%08X\n",
77 man->available_caching);
78 printk(KERN_ERR TTM_PFX " default_caching: 0x%08X\n",
79 man->default_caching);
80 if (mem_type != TTM_PL_SYSTEM)
81 (*man->func->debug)(man, TTM_PFX);
82}
83
84static void ttm_bo_mem_space_debug(struct ttm_buffer_object *bo,
85 struct ttm_placement *placement)
86{
87 int i, ret, mem_type;
88
89 printk(KERN_ERR TTM_PFX "No space for %p (%lu pages, %luK, %luM)\n",
90 bo, bo->mem.num_pages, bo->mem.size >> 10,
91 bo->mem.size >> 20);
92 for (i = 0; i < placement->num_placement; i++) {
93 ret = ttm_mem_type_from_flags(placement->placement[i],
94 &mem_type);
95 if (ret)
96 return;
97 printk(KERN_ERR TTM_PFX " placement[%d]=0x%08X (%d)\n",
98 i, placement->placement[i], mem_type);
99 ttm_mem_type_debug(bo->bdev, mem_type);
100 }
101}
102
103static ssize_t ttm_bo_global_show(struct kobject *kobj,
104 struct attribute *attr,
105 char *buffer)
106{
107 struct ttm_bo_global *glob =
108 container_of(kobj, struct ttm_bo_global, kobj);
109
110 return snprintf(buffer, PAGE_SIZE, "%lu\n",
111 (unsigned long) atomic_read(&glob->bo_count));
112}
113
114static struct attribute *ttm_bo_global_attrs[] = {
115 &ttm_bo_count,
116 NULL
117};
118
119static const struct sysfs_ops ttm_bo_global_ops = {
120 .show = &ttm_bo_global_show
121};
122
123static struct kobj_type ttm_bo_glob_kobj_type = {
124 .release = &ttm_bo_global_kobj_release,
125 .sysfs_ops = &ttm_bo_global_ops,
126 .default_attrs = ttm_bo_global_attrs
127};
128
129
130static inline uint32_t ttm_bo_type_flags(unsigned type)
131{
132 return 1 << (type);
133}
134
135static void ttm_bo_release_list(struct kref *list_kref)
136{
137 struct ttm_buffer_object *bo =
138 container_of(list_kref, struct ttm_buffer_object, list_kref);
139 struct ttm_bo_device *bdev = bo->bdev;
140
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->destroy)
153 bo->destroy(bo);
154 else {
155 ttm_mem_global_free(bdev->glob->mem_glob, bo->acc_size);
156 kfree(bo);
157 }
158}
159
160int ttm_bo_wait_unreserved(struct ttm_buffer_object *bo, bool interruptible)
161{
162 if (interruptible) {
163 return wait_event_interruptible(bo->event_queue,
164 atomic_read(&bo->reserved) == 0);
165 } else {
166 wait_event(bo->event_queue, atomic_read(&bo->reserved) == 0);
167 return 0;
168 }
169}
170EXPORT_SYMBOL(ttm_bo_wait_unreserved);
171
172void ttm_bo_add_to_lru(struct ttm_buffer_object *bo)
173{
174 struct ttm_bo_device *bdev = bo->bdev;
175 struct ttm_mem_type_manager *man;
176
177 BUG_ON(!atomic_read(&bo->reserved));
178
179 if (!(bo->mem.placement & TTM_PL_FLAG_NO_EVICT)) {
180
181 BUG_ON(!list_empty(&bo->lru));
182
183 man = &bdev->man[bo->mem.mem_type];
184 list_add_tail(&bo->lru, &man->lru);
185 kref_get(&bo->list_kref);
186
187 if (bo->ttm != NULL) {
188 list_add_tail(&bo->swap, &bo->glob->swap_lru);
189 kref_get(&bo->list_kref);
190 }
191 }
192}
193
194int ttm_bo_del_from_lru(struct ttm_buffer_object *bo)
195{
196 int put_count = 0;
197
198 if (!list_empty(&bo->swap)) {
199 list_del_init(&bo->swap);
200 ++put_count;
201 }
202 if (!list_empty(&bo->lru)) {
203 list_del_init(&bo->lru);
204 ++put_count;
205 }
206
207 /*
208 * TODO: Add a driver hook to delete from
209 * driver-specific LRU's here.
210 */
211
212 return put_count;
213}
214
215int ttm_bo_reserve_locked(struct ttm_buffer_object *bo,
216 bool interruptible,
217 bool no_wait, bool use_sequence, uint32_t sequence)
218{
219 struct ttm_bo_global *glob = bo->glob;
220 int ret;
221
222 while (unlikely(atomic_cmpxchg(&bo->reserved, 0, 1) != 0)) {
223 /**
224 * Deadlock avoidance for multi-bo reserving.
225 */
226 if (use_sequence && bo->seq_valid) {
227 /**
228 * We've already reserved this one.
229 */
230 if (unlikely(sequence == bo->val_seq))
231 return -EDEADLK;
232 /**
233 * Already reserved by a thread that will not back
234 * off for us. We need to back off.
235 */
236 if (unlikely(sequence - bo->val_seq < (1 << 31)))
237 return -EAGAIN;
238 }
239
240 if (no_wait)
241 return -EBUSY;
242
243 spin_unlock(&glob->lru_lock);
244 ret = ttm_bo_wait_unreserved(bo, interruptible);
245 spin_lock(&glob->lru_lock);
246
247 if (unlikely(ret))
248 return ret;
249 }
250
251 if (use_sequence) {
252 /**
253 * Wake up waiters that may need to recheck for deadlock,
254 * if we decreased the sequence number.
255 */
256 if (unlikely((bo->val_seq - sequence < (1 << 31))
257 || !bo->seq_valid))
258 wake_up_all(&bo->event_queue);
259
260 bo->val_seq = sequence;
261 bo->seq_valid = true;
262 } else {
263 bo->seq_valid = false;
264 }
265
266 return 0;
267}
268EXPORT_SYMBOL(ttm_bo_reserve);
269
270static void ttm_bo_ref_bug(struct kref *list_kref)
271{
272 BUG();
273}
274
275void ttm_bo_list_ref_sub(struct ttm_buffer_object *bo, int count,
276 bool never_free)
277{
278 kref_sub(&bo->list_kref, count,
279 (never_free) ? ttm_bo_ref_bug : ttm_bo_release_list);
280}
281
282int ttm_bo_reserve(struct ttm_buffer_object *bo,
283 bool interruptible,
284 bool no_wait, bool use_sequence, uint32_t sequence)
285{
286 struct ttm_bo_global *glob = bo->glob;
287 int put_count = 0;
288 int ret;
289
290 spin_lock(&glob->lru_lock);
291 ret = ttm_bo_reserve_locked(bo, interruptible, no_wait, use_sequence,
292 sequence);
293 if (likely(ret == 0))
294 put_count = ttm_bo_del_from_lru(bo);
295 spin_unlock(&glob->lru_lock);
296
297 ttm_bo_list_ref_sub(bo, put_count, true);
298
299 return ret;
300}
301
302void ttm_bo_unreserve_locked(struct ttm_buffer_object *bo)
303{
304 ttm_bo_add_to_lru(bo);
305 atomic_set(&bo->reserved, 0);
306 wake_up_all(&bo->event_queue);
307}
308
309void ttm_bo_unreserve(struct ttm_buffer_object *bo)
310{
311 struct ttm_bo_global *glob = bo->glob;
312
313 spin_lock(&glob->lru_lock);
314 ttm_bo_unreserve_locked(bo);
315 spin_unlock(&glob->lru_lock);
316}
317EXPORT_SYMBOL(ttm_bo_unreserve);
318
319/*
320 * Call bo->mutex locked.
321 */
322static int ttm_bo_add_ttm(struct ttm_buffer_object *bo, bool zero_alloc)
323{
324 struct ttm_bo_device *bdev = bo->bdev;
325 struct ttm_bo_global *glob = bo->glob;
326 int ret = 0;
327 uint32_t page_flags = 0;
328
329 TTM_ASSERT_LOCKED(&bo->mutex);
330 bo->ttm = NULL;
331
332 if (bdev->need_dma32)
333 page_flags |= TTM_PAGE_FLAG_DMA32;
334
335 switch (bo->type) {
336 case ttm_bo_type_device:
337 if (zero_alloc)
338 page_flags |= TTM_PAGE_FLAG_ZERO_ALLOC;
339 case ttm_bo_type_kernel:
340 bo->ttm = ttm_tt_create(bdev, bo->num_pages << PAGE_SHIFT,
341 page_flags, glob->dummy_read_page);
342 if (unlikely(bo->ttm == NULL))
343 ret = -ENOMEM;
344 break;
345 case ttm_bo_type_user:
346 bo->ttm = ttm_tt_create(bdev, bo->num_pages << PAGE_SHIFT,
347 page_flags | TTM_PAGE_FLAG_USER,
348 glob->dummy_read_page);
349 if (unlikely(bo->ttm == NULL)) {
350 ret = -ENOMEM;
351 break;
352 }
353
354 ret = ttm_tt_set_user(bo->ttm, current,
355 bo->buffer_start, bo->num_pages);
356 if (unlikely(ret != 0)) {
357 ttm_tt_destroy(bo->ttm);
358 bo->ttm = NULL;
359 }
360 break;
361 default:
362 printk(KERN_ERR TTM_PFX "Illegal buffer object type\n");
363 ret = -EINVAL;
364 break;
365 }
366
367 return ret;
368}
369
370static int ttm_bo_handle_move_mem(struct ttm_buffer_object *bo,
371 struct ttm_mem_reg *mem,
372 bool evict, bool interruptible,
373 bool no_wait_reserve, bool no_wait_gpu)
374{
375 struct ttm_bo_device *bdev = bo->bdev;
376 bool old_is_pci = ttm_mem_reg_is_pci(bdev, &bo->mem);
377 bool new_is_pci = ttm_mem_reg_is_pci(bdev, mem);
378 struct ttm_mem_type_manager *old_man = &bdev->man[bo->mem.mem_type];
379 struct ttm_mem_type_manager *new_man = &bdev->man[mem->mem_type];
380 int ret = 0;
381
382 if (old_is_pci || new_is_pci ||
383 ((mem->placement & bo->mem.placement & TTM_PL_MASK_CACHING) == 0)) {
384 ret = ttm_mem_io_lock(old_man, true);
385 if (unlikely(ret != 0))
386 goto out_err;
387 ttm_bo_unmap_virtual_locked(bo);
388 ttm_mem_io_unlock(old_man);
389 }
390
391 /*
392 * Create and bind a ttm if required.
393 */
394
395 if (!(new_man->flags & TTM_MEMTYPE_FLAG_FIXED)) {
396 if (bo->ttm == NULL) {
397 bool zero = !(old_man->flags & TTM_MEMTYPE_FLAG_FIXED);
398 ret = ttm_bo_add_ttm(bo, zero);
399 if (ret)
400 goto out_err;
401 }
402
403 ret = ttm_tt_set_placement_caching(bo->ttm, mem->placement);
404 if (ret)
405 goto out_err;
406
407 if (mem->mem_type != TTM_PL_SYSTEM) {
408 ret = ttm_tt_bind(bo->ttm, mem);
409 if (ret)
410 goto out_err;
411 }
412
413 if (bo->mem.mem_type == TTM_PL_SYSTEM) {
414 if (bdev->driver->move_notify)
415 bdev->driver->move_notify(bo, mem);
416 bo->mem = *mem;
417 mem->mm_node = NULL;
418 goto moved;
419 }
420 }
421
422 if (bdev->driver->move_notify)
423 bdev->driver->move_notify(bo, mem);
424
425 if (!(old_man->flags & TTM_MEMTYPE_FLAG_FIXED) &&
426 !(new_man->flags & TTM_MEMTYPE_FLAG_FIXED))
427 ret = ttm_bo_move_ttm(bo, evict, no_wait_reserve, no_wait_gpu, mem);
428 else if (bdev->driver->move)
429 ret = bdev->driver->move(bo, evict, interruptible,
430 no_wait_reserve, no_wait_gpu, mem);
431 else
432 ret = ttm_bo_move_memcpy(bo, evict, no_wait_reserve, no_wait_gpu, mem);
433
434 if (ret)
435 goto out_err;
436
437moved:
438 if (bo->evicted) {
439 ret = bdev->driver->invalidate_caches(bdev, bo->mem.placement);
440 if (ret)
441 printk(KERN_ERR TTM_PFX "Can not flush read caches\n");
442 bo->evicted = false;
443 }
444
445 if (bo->mem.mm_node) {
446 bo->offset = (bo->mem.start << PAGE_SHIFT) +
447 bdev->man[bo->mem.mem_type].gpu_offset;
448 bo->cur_placement = bo->mem.placement;
449 } else
450 bo->offset = 0;
451
452 return 0;
453
454out_err:
455 new_man = &bdev->man[bo->mem.mem_type];
456 if ((new_man->flags & TTM_MEMTYPE_FLAG_FIXED) && bo->ttm) {
457 ttm_tt_unbind(bo->ttm);
458 ttm_tt_destroy(bo->ttm);
459 bo->ttm = NULL;
460 }
461
462 return ret;
463}
464
465/**
466 * Call bo::reserved.
467 * Will release GPU memory type usage on destruction.
468 * This is the place to put in driver specific hooks to release
469 * driver private resources.
470 * Will release the bo::reserved lock.
471 */
472
473static void ttm_bo_cleanup_memtype_use(struct ttm_buffer_object *bo)
474{
475 if (bo->ttm) {
476 ttm_tt_unbind(bo->ttm);
477 ttm_tt_destroy(bo->ttm);
478 bo->ttm = NULL;
479 }
480 ttm_bo_mem_put(bo, &bo->mem);
481
482 atomic_set(&bo->reserved, 0);
483
484 /*
485 * Make processes trying to reserve really pick it up.
486 */
487 smp_mb__after_atomic_dec();
488 wake_up_all(&bo->event_queue);
489}
490
491static void ttm_bo_cleanup_refs_or_queue(struct ttm_buffer_object *bo)
492{
493 struct ttm_bo_device *bdev = bo->bdev;
494 struct ttm_bo_global *glob = bo->glob;
495 struct ttm_bo_driver *driver;
496 void *sync_obj = NULL;
497 void *sync_obj_arg;
498 int put_count;
499 int ret;
500
501 spin_lock(&bdev->fence_lock);
502 (void) ttm_bo_wait(bo, false, false, true);
503 if (!bo->sync_obj) {
504
505 spin_lock(&glob->lru_lock);
506
507 /**
508 * Lock inversion between bo:reserve and bdev::fence_lock here,
509 * but that's OK, since we're only trylocking.
510 */
511
512 ret = ttm_bo_reserve_locked(bo, false, true, false, 0);
513
514 if (unlikely(ret == -EBUSY))
515 goto queue;
516
517 spin_unlock(&bdev->fence_lock);
518 put_count = ttm_bo_del_from_lru(bo);
519
520 spin_unlock(&glob->lru_lock);
521 ttm_bo_cleanup_memtype_use(bo);
522
523 ttm_bo_list_ref_sub(bo, put_count, true);
524
525 return;
526 } else {
527 spin_lock(&glob->lru_lock);
528 }
529queue:
530 driver = bdev->driver;
531 if (bo->sync_obj)
532 sync_obj = driver->sync_obj_ref(bo->sync_obj);
533 sync_obj_arg = bo->sync_obj_arg;
534
535 kref_get(&bo->list_kref);
536 list_add_tail(&bo->ddestroy, &bdev->ddestroy);
537 spin_unlock(&glob->lru_lock);
538 spin_unlock(&bdev->fence_lock);
539
540 if (sync_obj) {
541 driver->sync_obj_flush(sync_obj, sync_obj_arg);
542 driver->sync_obj_unref(&sync_obj);
543 }
544 schedule_delayed_work(&bdev->wq,
545 ((HZ / 100) < 1) ? 1 : HZ / 100);
546}
547
548/**
549 * function ttm_bo_cleanup_refs
550 * If bo idle, remove from delayed- and lru lists, and unref.
551 * If not idle, do nothing.
552 *
553 * @interruptible Any sleeps should occur interruptibly.
554 * @no_wait_reserve Never wait for reserve. Return -EBUSY instead.
555 * @no_wait_gpu Never wait for gpu. Return -EBUSY instead.
556 */
557
558static int ttm_bo_cleanup_refs(struct ttm_buffer_object *bo,
559 bool interruptible,
560 bool no_wait_reserve,
561 bool no_wait_gpu)
562{
563 struct ttm_bo_device *bdev = bo->bdev;
564 struct ttm_bo_global *glob = bo->glob;
565 int put_count;
566 int ret = 0;
567
568retry:
569 spin_lock(&bdev->fence_lock);
570 ret = ttm_bo_wait(bo, false, interruptible, no_wait_gpu);
571 spin_unlock(&bdev->fence_lock);
572
573 if (unlikely(ret != 0))
574 return ret;
575
576 spin_lock(&glob->lru_lock);
577 ret = ttm_bo_reserve_locked(bo, interruptible,
578 no_wait_reserve, false, 0);
579
580 if (unlikely(ret != 0) || list_empty(&bo->ddestroy)) {
581 spin_unlock(&glob->lru_lock);
582 return ret;
583 }
584
585 /**
586 * We can re-check for sync object without taking
587 * the bo::lock since setting the sync object requires
588 * also bo::reserved. A busy object at this point may
589 * be caused by another thread recently starting an accelerated
590 * eviction.
591 */
592
593 if (unlikely(bo->sync_obj)) {
594 atomic_set(&bo->reserved, 0);
595 wake_up_all(&bo->event_queue);
596 spin_unlock(&glob->lru_lock);
597 goto retry;
598 }
599
600 put_count = ttm_bo_del_from_lru(bo);
601 list_del_init(&bo->ddestroy);
602 ++put_count;
603
604 spin_unlock(&glob->lru_lock);
605 ttm_bo_cleanup_memtype_use(bo);
606
607 ttm_bo_list_ref_sub(bo, put_count, true);
608
609 return 0;
610}
611
612/**
613 * Traverse the delayed list, and call ttm_bo_cleanup_refs on all
614 * encountered buffers.
615 */
616
617static int ttm_bo_delayed_delete(struct ttm_bo_device *bdev, bool remove_all)
618{
619 struct ttm_bo_global *glob = bdev->glob;
620 struct ttm_buffer_object *entry = NULL;
621 int ret = 0;
622
623 spin_lock(&glob->lru_lock);
624 if (list_empty(&bdev->ddestroy))
625 goto out_unlock;
626
627 entry = list_first_entry(&bdev->ddestroy,
628 struct ttm_buffer_object, ddestroy);
629 kref_get(&entry->list_kref);
630
631 for (;;) {
632 struct ttm_buffer_object *nentry = NULL;
633
634 if (entry->ddestroy.next != &bdev->ddestroy) {
635 nentry = list_first_entry(&entry->ddestroy,
636 struct ttm_buffer_object, ddestroy);
637 kref_get(&nentry->list_kref);
638 }
639
640 spin_unlock(&glob->lru_lock);
641 ret = ttm_bo_cleanup_refs(entry, false, !remove_all,
642 !remove_all);
643 kref_put(&entry->list_kref, ttm_bo_release_list);
644 entry = nentry;
645
646 if (ret || !entry)
647 goto out;
648
649 spin_lock(&glob->lru_lock);
650 if (list_empty(&entry->ddestroy))
651 break;
652 }
653
654out_unlock:
655 spin_unlock(&glob->lru_lock);
656out:
657 if (entry)
658 kref_put(&entry->list_kref, ttm_bo_release_list);
659 return ret;
660}
661
662static void ttm_bo_delayed_workqueue(struct work_struct *work)
663{
664 struct ttm_bo_device *bdev =
665 container_of(work, struct ttm_bo_device, wq.work);
666
667 if (ttm_bo_delayed_delete(bdev, false)) {
668 schedule_delayed_work(&bdev->wq,
669 ((HZ / 100) < 1) ? 1 : HZ / 100);
670 }
671}
672
673static void ttm_bo_release(struct kref *kref)
674{
675 struct ttm_buffer_object *bo =
676 container_of(kref, struct ttm_buffer_object, kref);
677 struct ttm_bo_device *bdev = bo->bdev;
678 struct ttm_mem_type_manager *man = &bdev->man[bo->mem.mem_type];
679
680 if (likely(bo->vm_node != NULL)) {
681 rb_erase(&bo->vm_rb, &bdev->addr_space_rb);
682 drm_mm_put_block(bo->vm_node);
683 bo->vm_node = NULL;
684 }
685 write_unlock(&bdev->vm_lock);
686 ttm_mem_io_lock(man, false);
687 ttm_mem_io_free_vm(bo);
688 ttm_mem_io_unlock(man);
689 ttm_bo_cleanup_refs_or_queue(bo);
690 kref_put(&bo->list_kref, ttm_bo_release_list);
691 write_lock(&bdev->vm_lock);
692}
693
694void ttm_bo_unref(struct ttm_buffer_object **p_bo)
695{
696 struct ttm_buffer_object *bo = *p_bo;
697 struct ttm_bo_device *bdev = bo->bdev;
698
699 *p_bo = NULL;
700 write_lock(&bdev->vm_lock);
701 kref_put(&bo->kref, ttm_bo_release);
702 write_unlock(&bdev->vm_lock);
703}
704EXPORT_SYMBOL(ttm_bo_unref);
705
706int ttm_bo_lock_delayed_workqueue(struct ttm_bo_device *bdev)
707{
708 return cancel_delayed_work_sync(&bdev->wq);
709}
710EXPORT_SYMBOL(ttm_bo_lock_delayed_workqueue);
711
712void ttm_bo_unlock_delayed_workqueue(struct ttm_bo_device *bdev, int resched)
713{
714 if (resched)
715 schedule_delayed_work(&bdev->wq,
716 ((HZ / 100) < 1) ? 1 : HZ / 100);
717}
718EXPORT_SYMBOL(ttm_bo_unlock_delayed_workqueue);
719
720static int ttm_bo_evict(struct ttm_buffer_object *bo, bool interruptible,
721 bool no_wait_reserve, bool no_wait_gpu)
722{
723 struct ttm_bo_device *bdev = bo->bdev;
724 struct ttm_mem_reg evict_mem;
725 struct ttm_placement placement;
726 int ret = 0;
727
728 spin_lock(&bdev->fence_lock);
729 ret = ttm_bo_wait(bo, false, interruptible, no_wait_gpu);
730 spin_unlock(&bdev->fence_lock);
731
732 if (unlikely(ret != 0)) {
733 if (ret != -ERESTARTSYS) {
734 printk(KERN_ERR TTM_PFX
735 "Failed to expire sync object before "
736 "buffer eviction.\n");
737 }
738 goto out;
739 }
740
741 BUG_ON(!atomic_read(&bo->reserved));
742
743 evict_mem = bo->mem;
744 evict_mem.mm_node = NULL;
745 evict_mem.bus.io_reserved_vm = false;
746 evict_mem.bus.io_reserved_count = 0;
747
748 placement.fpfn = 0;
749 placement.lpfn = 0;
750 placement.num_placement = 0;
751 placement.num_busy_placement = 0;
752 bdev->driver->evict_flags(bo, &placement);
753 ret = ttm_bo_mem_space(bo, &placement, &evict_mem, interruptible,
754 no_wait_reserve, no_wait_gpu);
755 if (ret) {
756 if (ret != -ERESTARTSYS) {
757 printk(KERN_ERR TTM_PFX
758 "Failed to find memory space for "
759 "buffer 0x%p eviction.\n", bo);
760 ttm_bo_mem_space_debug(bo, &placement);
761 }
762 goto out;
763 }
764
765 ret = ttm_bo_handle_move_mem(bo, &evict_mem, true, interruptible,
766 no_wait_reserve, no_wait_gpu);
767 if (ret) {
768 if (ret != -ERESTARTSYS)
769 printk(KERN_ERR TTM_PFX "Buffer eviction failed\n");
770 ttm_bo_mem_put(bo, &evict_mem);
771 goto out;
772 }
773 bo->evicted = true;
774out:
775 return ret;
776}
777
778static int ttm_mem_evict_first(struct ttm_bo_device *bdev,
779 uint32_t mem_type,
780 bool interruptible, bool no_wait_reserve,
781 bool no_wait_gpu)
782{
783 struct ttm_bo_global *glob = bdev->glob;
784 struct ttm_mem_type_manager *man = &bdev->man[mem_type];
785 struct ttm_buffer_object *bo;
786 int ret, put_count = 0;
787
788retry:
789 spin_lock(&glob->lru_lock);
790 if (list_empty(&man->lru)) {
791 spin_unlock(&glob->lru_lock);
792 return -EBUSY;
793 }
794
795 bo = list_first_entry(&man->lru, struct ttm_buffer_object, lru);
796 kref_get(&bo->list_kref);
797
798 if (!list_empty(&bo->ddestroy)) {
799 spin_unlock(&glob->lru_lock);
800 ret = ttm_bo_cleanup_refs(bo, interruptible,
801 no_wait_reserve, no_wait_gpu);
802 kref_put(&bo->list_kref, ttm_bo_release_list);
803
804 if (likely(ret == 0 || ret == -ERESTARTSYS))
805 return ret;
806
807 goto retry;
808 }
809
810 ret = ttm_bo_reserve_locked(bo, false, no_wait_reserve, false, 0);
811
812 if (unlikely(ret == -EBUSY)) {
813 spin_unlock(&glob->lru_lock);
814 if (likely(!no_wait_gpu))
815 ret = ttm_bo_wait_unreserved(bo, interruptible);
816
817 kref_put(&bo->list_kref, ttm_bo_release_list);
818
819 /**
820 * We *need* to retry after releasing the lru lock.
821 */
822
823 if (unlikely(ret != 0))
824 return ret;
825 goto retry;
826 }
827
828 put_count = ttm_bo_del_from_lru(bo);
829 spin_unlock(&glob->lru_lock);
830
831 BUG_ON(ret != 0);
832
833 ttm_bo_list_ref_sub(bo, put_count, true);
834
835 ret = ttm_bo_evict(bo, interruptible, no_wait_reserve, no_wait_gpu);
836 ttm_bo_unreserve(bo);
837
838 kref_put(&bo->list_kref, ttm_bo_release_list);
839 return ret;
840}
841
842void ttm_bo_mem_put(struct ttm_buffer_object *bo, struct ttm_mem_reg *mem)
843{
844 struct ttm_mem_type_manager *man = &bo->bdev->man[mem->mem_type];
845
846 if (mem->mm_node)
847 (*man->func->put_node)(man, mem);
848}
849EXPORT_SYMBOL(ttm_bo_mem_put);
850
851/**
852 * Repeatedly evict memory from the LRU for @mem_type until we create enough
853 * space, or we've evicted everything and there isn't enough space.
854 */
855static int ttm_bo_mem_force_space(struct ttm_buffer_object *bo,
856 uint32_t mem_type,
857 struct ttm_placement *placement,
858 struct ttm_mem_reg *mem,
859 bool interruptible,
860 bool no_wait_reserve,
861 bool no_wait_gpu)
862{
863 struct ttm_bo_device *bdev = bo->bdev;
864 struct ttm_mem_type_manager *man = &bdev->man[mem_type];
865 int ret;
866
867 do {
868 ret = (*man->func->get_node)(man, bo, placement, mem);
869 if (unlikely(ret != 0))
870 return ret;
871 if (mem->mm_node)
872 break;
873 ret = ttm_mem_evict_first(bdev, mem_type, interruptible,
874 no_wait_reserve, no_wait_gpu);
875 if (unlikely(ret != 0))
876 return ret;
877 } while (1);
878 if (mem->mm_node == NULL)
879 return -ENOMEM;
880 mem->mem_type = mem_type;
881 return 0;
882}
883
884static uint32_t ttm_bo_select_caching(struct ttm_mem_type_manager *man,
885 uint32_t cur_placement,
886 uint32_t proposed_placement)
887{
888 uint32_t caching = proposed_placement & TTM_PL_MASK_CACHING;
889 uint32_t result = proposed_placement & ~TTM_PL_MASK_CACHING;
890
891 /**
892 * Keep current caching if possible.
893 */
894
895 if ((cur_placement & caching) != 0)
896 result |= (cur_placement & caching);
897 else if ((man->default_caching & caching) != 0)
898 result |= man->default_caching;
899 else if ((TTM_PL_FLAG_CACHED & caching) != 0)
900 result |= TTM_PL_FLAG_CACHED;
901 else if ((TTM_PL_FLAG_WC & caching) != 0)
902 result |= TTM_PL_FLAG_WC;
903 else if ((TTM_PL_FLAG_UNCACHED & caching) != 0)
904 result |= TTM_PL_FLAG_UNCACHED;
905
906 return result;
907}
908
909static bool ttm_bo_mt_compatible(struct ttm_mem_type_manager *man,
910 bool disallow_fixed,
911 uint32_t mem_type,
912 uint32_t proposed_placement,
913 uint32_t *masked_placement)
914{
915 uint32_t cur_flags = ttm_bo_type_flags(mem_type);
916
917 if ((man->flags & TTM_MEMTYPE_FLAG_FIXED) && disallow_fixed)
918 return false;
919
920 if ((cur_flags & proposed_placement & TTM_PL_MASK_MEM) == 0)
921 return false;
922
923 if ((proposed_placement & man->available_caching) == 0)
924 return false;
925
926 cur_flags |= (proposed_placement & man->available_caching);
927
928 *masked_placement = cur_flags;
929 return true;
930}
931
932/**
933 * Creates space for memory region @mem according to its type.
934 *
935 * This function first searches for free space in compatible memory types in
936 * the priority order defined by the driver. If free space isn't found, then
937 * ttm_bo_mem_force_space is attempted in priority order to evict and find
938 * space.
939 */
940int ttm_bo_mem_space(struct ttm_buffer_object *bo,
941 struct ttm_placement *placement,
942 struct ttm_mem_reg *mem,
943 bool interruptible, bool no_wait_reserve,
944 bool no_wait_gpu)
945{
946 struct ttm_bo_device *bdev = bo->bdev;
947 struct ttm_mem_type_manager *man;
948 uint32_t mem_type = TTM_PL_SYSTEM;
949 uint32_t cur_flags = 0;
950 bool type_found = false;
951 bool type_ok = false;
952 bool has_erestartsys = false;
953 int i, ret;
954
955 mem->mm_node = NULL;
956 for (i = 0; i < placement->num_placement; ++i) {
957 ret = ttm_mem_type_from_flags(placement->placement[i],
958 &mem_type);
959 if (ret)
960 return ret;
961 man = &bdev->man[mem_type];
962
963 type_ok = ttm_bo_mt_compatible(man,
964 bo->type == ttm_bo_type_user,
965 mem_type,
966 placement->placement[i],
967 &cur_flags);
968
969 if (!type_ok)
970 continue;
971
972 cur_flags = ttm_bo_select_caching(man, bo->mem.placement,
973 cur_flags);
974 /*
975 * Use the access and other non-mapping-related flag bits from
976 * the memory placement flags to the current flags
977 */
978 ttm_flag_masked(&cur_flags, placement->placement[i],
979 ~TTM_PL_MASK_MEMTYPE);
980
981 if (mem_type == TTM_PL_SYSTEM)
982 break;
983
984 if (man->has_type && man->use_type) {
985 type_found = true;
986 ret = (*man->func->get_node)(man, bo, placement, mem);
987 if (unlikely(ret))
988 return ret;
989 }
990 if (mem->mm_node)
991 break;
992 }
993
994 if ((type_ok && (mem_type == TTM_PL_SYSTEM)) || mem->mm_node) {
995 mem->mem_type = mem_type;
996 mem->placement = cur_flags;
997 return 0;
998 }
999
1000 if (!type_found)
1001 return -EINVAL;
1002
1003 for (i = 0; i < placement->num_busy_placement; ++i) {
1004 ret = ttm_mem_type_from_flags(placement->busy_placement[i],
1005 &mem_type);
1006 if (ret)
1007 return ret;
1008 man = &bdev->man[mem_type];
1009 if (!man->has_type)
1010 continue;
1011 if (!ttm_bo_mt_compatible(man,
1012 bo->type == ttm_bo_type_user,
1013 mem_type,
1014 placement->busy_placement[i],
1015 &cur_flags))
1016 continue;
1017
1018 cur_flags = ttm_bo_select_caching(man, bo->mem.placement,
1019 cur_flags);
1020 /*
1021 * Use the access and other non-mapping-related flag bits from
1022 * the memory placement flags to the current flags
1023 */
1024 ttm_flag_masked(&cur_flags, placement->busy_placement[i],
1025 ~TTM_PL_MASK_MEMTYPE);
1026
1027
1028 if (mem_type == TTM_PL_SYSTEM) {
1029 mem->mem_type = mem_type;
1030 mem->placement = cur_flags;
1031 mem->mm_node = NULL;
1032 return 0;
1033 }
1034
1035 ret = ttm_bo_mem_force_space(bo, mem_type, placement, mem,
1036 interruptible, no_wait_reserve, no_wait_gpu);
1037 if (ret == 0 && mem->mm_node) {
1038 mem->placement = cur_flags;
1039 return 0;
1040 }
1041 if (ret == -ERESTARTSYS)
1042 has_erestartsys = true;
1043 }
1044 ret = (has_erestartsys) ? -ERESTARTSYS : -ENOMEM;
1045 return ret;
1046}
1047EXPORT_SYMBOL(ttm_bo_mem_space);
1048
1049int ttm_bo_wait_cpu(struct ttm_buffer_object *bo, bool no_wait)
1050{
1051 if ((atomic_read(&bo->cpu_writers) > 0) && no_wait)
1052 return -EBUSY;
1053
1054 return wait_event_interruptible(bo->event_queue,
1055 atomic_read(&bo->cpu_writers) == 0);
1056}
1057EXPORT_SYMBOL(ttm_bo_wait_cpu);
1058
1059int ttm_bo_move_buffer(struct ttm_buffer_object *bo,
1060 struct ttm_placement *placement,
1061 bool interruptible, bool no_wait_reserve,
1062 bool no_wait_gpu)
1063{
1064 int ret = 0;
1065 struct ttm_mem_reg mem;
1066 struct ttm_bo_device *bdev = bo->bdev;
1067
1068 BUG_ON(!atomic_read(&bo->reserved));
1069
1070 /*
1071 * FIXME: It's possible to pipeline buffer moves.
1072 * Have the driver move function wait for idle when necessary,
1073 * instead of doing it here.
1074 */
1075 spin_lock(&bdev->fence_lock);
1076 ret = ttm_bo_wait(bo, false, interruptible, no_wait_gpu);
1077 spin_unlock(&bdev->fence_lock);
1078 if (ret)
1079 return ret;
1080 mem.num_pages = bo->num_pages;
1081 mem.size = mem.num_pages << PAGE_SHIFT;
1082 mem.page_alignment = bo->mem.page_alignment;
1083 mem.bus.io_reserved_vm = false;
1084 mem.bus.io_reserved_count = 0;
1085 /*
1086 * Determine where to move the buffer.
1087 */
1088 ret = ttm_bo_mem_space(bo, placement, &mem, interruptible, no_wait_reserve, no_wait_gpu);
1089 if (ret)
1090 goto out_unlock;
1091 ret = ttm_bo_handle_move_mem(bo, &mem, false, interruptible, no_wait_reserve, no_wait_gpu);
1092out_unlock:
1093 if (ret && mem.mm_node)
1094 ttm_bo_mem_put(bo, &mem);
1095 return ret;
1096}
1097
1098static int ttm_bo_mem_compat(struct ttm_placement *placement,
1099 struct ttm_mem_reg *mem)
1100{
1101 int i;
1102
1103 if (mem->mm_node && placement->lpfn != 0 &&
1104 (mem->start < placement->fpfn ||
1105 mem->start + mem->num_pages > placement->lpfn))
1106 return -1;
1107
1108 for (i = 0; i < placement->num_placement; i++) {
1109 if ((placement->placement[i] & mem->placement &
1110 TTM_PL_MASK_CACHING) &&
1111 (placement->placement[i] & mem->placement &
1112 TTM_PL_MASK_MEM))
1113 return i;
1114 }
1115 return -1;
1116}
1117
1118int ttm_bo_validate(struct ttm_buffer_object *bo,
1119 struct ttm_placement *placement,
1120 bool interruptible, bool no_wait_reserve,
1121 bool no_wait_gpu)
1122{
1123 int ret;
1124
1125 BUG_ON(!atomic_read(&bo->reserved));
1126 /* Check that range is valid */
1127 if (placement->lpfn || placement->fpfn)
1128 if (placement->fpfn > placement->lpfn ||
1129 (placement->lpfn - placement->fpfn) < bo->num_pages)
1130 return -EINVAL;
1131 /*
1132 * Check whether we need to move buffer.
1133 */
1134 ret = ttm_bo_mem_compat(placement, &bo->mem);
1135 if (ret < 0) {
1136 ret = ttm_bo_move_buffer(bo, placement, interruptible, no_wait_reserve, no_wait_gpu);
1137 if (ret)
1138 return ret;
1139 } else {
1140 /*
1141 * Use the access and other non-mapping-related flag bits from
1142 * the compatible memory placement flags to the active flags
1143 */
1144 ttm_flag_masked(&bo->mem.placement, placement->placement[ret],
1145 ~TTM_PL_MASK_MEMTYPE);
1146 }
1147 /*
1148 * We might need to add a TTM.
1149 */
1150 if (bo->mem.mem_type == TTM_PL_SYSTEM && bo->ttm == NULL) {
1151 ret = ttm_bo_add_ttm(bo, true);
1152 if (ret)
1153 return ret;
1154 }
1155 return 0;
1156}
1157EXPORT_SYMBOL(ttm_bo_validate);
1158
1159int ttm_bo_check_placement(struct ttm_buffer_object *bo,
1160 struct ttm_placement *placement)
1161{
1162 BUG_ON((placement->fpfn || placement->lpfn) &&
1163 (bo->mem.num_pages > (placement->lpfn - placement->fpfn)));
1164
1165 return 0;
1166}
1167
1168int ttm_bo_init(struct ttm_bo_device *bdev,
1169 struct ttm_buffer_object *bo,
1170 unsigned long size,
1171 enum ttm_bo_type type,
1172 struct ttm_placement *placement,
1173 uint32_t page_alignment,
1174 unsigned long buffer_start,
1175 bool interruptible,
1176 struct file *persistent_swap_storage,
1177 size_t acc_size,
1178 void (*destroy) (struct ttm_buffer_object *))
1179{
1180 int ret = 0;
1181 unsigned long num_pages;
1182
1183 size += buffer_start & ~PAGE_MASK;
1184 num_pages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
1185 if (num_pages == 0) {
1186 printk(KERN_ERR TTM_PFX "Illegal buffer object size.\n");
1187 if (destroy)
1188 (*destroy)(bo);
1189 else
1190 kfree(bo);
1191 return -EINVAL;
1192 }
1193 bo->destroy = destroy;
1194
1195 kref_init(&bo->kref);
1196 kref_init(&bo->list_kref);
1197 atomic_set(&bo->cpu_writers, 0);
1198 atomic_set(&bo->reserved, 1);
1199 init_waitqueue_head(&bo->event_queue);
1200 INIT_LIST_HEAD(&bo->lru);
1201 INIT_LIST_HEAD(&bo->ddestroy);
1202 INIT_LIST_HEAD(&bo->swap);
1203 INIT_LIST_HEAD(&bo->io_reserve_lru);
1204 bo->bdev = bdev;
1205 bo->glob = bdev->glob;
1206 bo->type = type;
1207 bo->num_pages = num_pages;
1208 bo->mem.size = num_pages << PAGE_SHIFT;
1209 bo->mem.mem_type = TTM_PL_SYSTEM;
1210 bo->mem.num_pages = bo->num_pages;
1211 bo->mem.mm_node = NULL;
1212 bo->mem.page_alignment = page_alignment;
1213 bo->mem.bus.io_reserved_vm = false;
1214 bo->mem.bus.io_reserved_count = 0;
1215 bo->buffer_start = buffer_start & PAGE_MASK;
1216 bo->priv_flags = 0;
1217 bo->mem.placement = (TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED);
1218 bo->seq_valid = false;
1219 bo->persistent_swap_storage = persistent_swap_storage;
1220 bo->acc_size = acc_size;
1221 atomic_inc(&bo->glob->bo_count);
1222
1223 ret = ttm_bo_check_placement(bo, placement);
1224 if (unlikely(ret != 0))
1225 goto out_err;
1226
1227 /*
1228 * For ttm_bo_type_device buffers, allocate
1229 * address space from the device.
1230 */
1231 if (bo->type == ttm_bo_type_device) {
1232 ret = ttm_bo_setup_vm(bo);
1233 if (ret)
1234 goto out_err;
1235 }
1236
1237 ret = ttm_bo_validate(bo, placement, interruptible, false, false);
1238 if (ret)
1239 goto out_err;
1240
1241 ttm_bo_unreserve(bo);
1242 return 0;
1243
1244out_err:
1245 ttm_bo_unreserve(bo);
1246 ttm_bo_unref(&bo);
1247
1248 return ret;
1249}
1250EXPORT_SYMBOL(ttm_bo_init);
1251
1252static inline size_t ttm_bo_size(struct ttm_bo_global *glob,
1253 unsigned long num_pages)
1254{
1255 size_t page_array_size = (num_pages * sizeof(void *) + PAGE_SIZE - 1) &
1256 PAGE_MASK;
1257
1258 return glob->ttm_bo_size + 2 * page_array_size;
1259}
1260
1261int ttm_bo_create(struct ttm_bo_device *bdev,
1262 unsigned long size,
1263 enum ttm_bo_type type,
1264 struct ttm_placement *placement,
1265 uint32_t page_alignment,
1266 unsigned long buffer_start,
1267 bool interruptible,
1268 struct file *persistent_swap_storage,
1269 struct ttm_buffer_object **p_bo)
1270{
1271 struct ttm_buffer_object *bo;
1272 struct ttm_mem_global *mem_glob = bdev->glob->mem_glob;
1273 int ret;
1274
1275 size_t acc_size =
1276 ttm_bo_size(bdev->glob, (size + PAGE_SIZE - 1) >> PAGE_SHIFT);
1277 ret = ttm_mem_global_alloc(mem_glob, acc_size, false, false);
1278 if (unlikely(ret != 0))
1279 return ret;
1280
1281 bo = kzalloc(sizeof(*bo), GFP_KERNEL);
1282
1283 if (unlikely(bo == NULL)) {
1284 ttm_mem_global_free(mem_glob, acc_size);
1285 return -ENOMEM;
1286 }
1287
1288 ret = ttm_bo_init(bdev, bo, size, type, placement, page_alignment,
1289 buffer_start, interruptible,
1290 persistent_swap_storage, acc_size, NULL);
1291 if (likely(ret == 0))
1292 *p_bo = bo;
1293
1294 return ret;
1295}
1296
1297static int ttm_bo_force_list_clean(struct ttm_bo_device *bdev,
1298 unsigned mem_type, bool allow_errors)
1299{
1300 struct ttm_mem_type_manager *man = &bdev->man[mem_type];
1301 struct ttm_bo_global *glob = bdev->glob;
1302 int ret;
1303
1304 /*
1305 * Can't use standard list traversal since we're unlocking.
1306 */
1307
1308 spin_lock(&glob->lru_lock);
1309 while (!list_empty(&man->lru)) {
1310 spin_unlock(&glob->lru_lock);
1311 ret = ttm_mem_evict_first(bdev, mem_type, false, false, false);
1312 if (ret) {
1313 if (allow_errors) {
1314 return ret;
1315 } else {
1316 printk(KERN_ERR TTM_PFX
1317 "Cleanup eviction failed\n");
1318 }
1319 }
1320 spin_lock(&glob->lru_lock);
1321 }
1322 spin_unlock(&glob->lru_lock);
1323 return 0;
1324}
1325
1326int ttm_bo_clean_mm(struct ttm_bo_device *bdev, unsigned mem_type)
1327{
1328 struct ttm_mem_type_manager *man;
1329 int ret = -EINVAL;
1330
1331 if (mem_type >= TTM_NUM_MEM_TYPES) {
1332 printk(KERN_ERR TTM_PFX "Illegal memory type %d\n", mem_type);
1333 return ret;
1334 }
1335 man = &bdev->man[mem_type];
1336
1337 if (!man->has_type) {
1338 printk(KERN_ERR TTM_PFX "Trying to take down uninitialized "
1339 "memory manager type %u\n", mem_type);
1340 return ret;
1341 }
1342
1343 man->use_type = false;
1344 man->has_type = false;
1345
1346 ret = 0;
1347 if (mem_type > 0) {
1348 ttm_bo_force_list_clean(bdev, mem_type, false);
1349
1350 ret = (*man->func->takedown)(man);
1351 }
1352
1353 return ret;
1354}
1355EXPORT_SYMBOL(ttm_bo_clean_mm);
1356
1357int ttm_bo_evict_mm(struct ttm_bo_device *bdev, unsigned mem_type)
1358{
1359 struct ttm_mem_type_manager *man = &bdev->man[mem_type];
1360
1361 if (mem_type == 0 || mem_type >= TTM_NUM_MEM_TYPES) {
1362 printk(KERN_ERR TTM_PFX
1363 "Illegal memory manager memory type %u.\n",
1364 mem_type);
1365 return -EINVAL;
1366 }
1367
1368 if (!man->has_type) {
1369 printk(KERN_ERR TTM_PFX
1370 "Memory type %u has not been initialized.\n",
1371 mem_type);
1372 return 0;
1373 }
1374
1375 return ttm_bo_force_list_clean(bdev, mem_type, true);
1376}
1377EXPORT_SYMBOL(ttm_bo_evict_mm);
1378
1379int ttm_bo_init_mm(struct ttm_bo_device *bdev, unsigned type,
1380 unsigned long p_size)
1381{
1382 int ret = -EINVAL;
1383 struct ttm_mem_type_manager *man;
1384
1385 BUG_ON(type >= TTM_NUM_MEM_TYPES);
1386 man = &bdev->man[type];
1387 BUG_ON(man->has_type);
1388 man->io_reserve_fastpath = true;
1389 man->use_io_reserve_lru = false;
1390 mutex_init(&man->io_reserve_mutex);
1391 INIT_LIST_HEAD(&man->io_reserve_lru);
1392
1393 ret = bdev->driver->init_mem_type(bdev, type, man);
1394 if (ret)
1395 return ret;
1396 man->bdev = bdev;
1397
1398 ret = 0;
1399 if (type != TTM_PL_SYSTEM) {
1400 ret = (*man->func->init)(man, p_size);
1401 if (ret)
1402 return ret;
1403 }
1404 man->has_type = true;
1405 man->use_type = true;
1406 man->size = p_size;
1407
1408 INIT_LIST_HEAD(&man->lru);
1409
1410 return 0;
1411}
1412EXPORT_SYMBOL(ttm_bo_init_mm);
1413
1414static void ttm_bo_global_kobj_release(struct kobject *kobj)
1415{
1416 struct ttm_bo_global *glob =
1417 container_of(kobj, struct ttm_bo_global, kobj);
1418
1419 ttm_mem_unregister_shrink(glob->mem_glob, &glob->shrink);
1420 __free_page(glob->dummy_read_page);
1421 kfree(glob);
1422}
1423
1424void ttm_bo_global_release(struct drm_global_reference *ref)
1425{
1426 struct ttm_bo_global *glob = ref->object;
1427
1428 kobject_del(&glob->kobj);
1429 kobject_put(&glob->kobj);
1430}
1431EXPORT_SYMBOL(ttm_bo_global_release);
1432
1433int ttm_bo_global_init(struct drm_global_reference *ref)
1434{
1435 struct ttm_bo_global_ref *bo_ref =
1436 container_of(ref, struct ttm_bo_global_ref, ref);
1437 struct ttm_bo_global *glob = ref->object;
1438 int ret;
1439
1440 mutex_init(&glob->device_list_mutex);
1441 spin_lock_init(&glob->lru_lock);
1442 glob->mem_glob = bo_ref->mem_glob;
1443 glob->dummy_read_page = alloc_page(__GFP_ZERO | GFP_DMA32);
1444
1445 if (unlikely(glob->dummy_read_page == NULL)) {
1446 ret = -ENOMEM;
1447 goto out_no_drp;
1448 }
1449
1450 INIT_LIST_HEAD(&glob->swap_lru);
1451 INIT_LIST_HEAD(&glob->device_list);
1452
1453 ttm_mem_init_shrink(&glob->shrink, ttm_bo_swapout);
1454 ret = ttm_mem_register_shrink(glob->mem_glob, &glob->shrink);
1455 if (unlikely(ret != 0)) {
1456 printk(KERN_ERR TTM_PFX
1457 "Could not register buffer object swapout.\n");
1458 goto out_no_shrink;
1459 }
1460
1461 glob->ttm_bo_extra_size =
1462 ttm_round_pot(sizeof(struct ttm_tt)) +
1463 ttm_round_pot(sizeof(struct ttm_backend));
1464
1465 glob->ttm_bo_size = glob->ttm_bo_extra_size +
1466 ttm_round_pot(sizeof(struct ttm_buffer_object));
1467
1468 atomic_set(&glob->bo_count, 0);
1469
1470 ret = kobject_init_and_add(
1471 &glob->kobj, &ttm_bo_glob_kobj_type, ttm_get_kobj(), "buffer_objects");
1472 if (unlikely(ret != 0))
1473 kobject_put(&glob->kobj);
1474 return ret;
1475out_no_shrink:
1476 __free_page(glob->dummy_read_page);
1477out_no_drp:
1478 kfree(glob);
1479 return ret;
1480}
1481EXPORT_SYMBOL(ttm_bo_global_init);
1482
1483
1484int ttm_bo_device_release(struct ttm_bo_device *bdev)
1485{
1486 int ret = 0;
1487 unsigned i = TTM_NUM_MEM_TYPES;
1488 struct ttm_mem_type_manager *man;
1489 struct ttm_bo_global *glob = bdev->glob;
1490
1491 while (i--) {
1492 man = &bdev->man[i];
1493 if (man->has_type) {
1494 man->use_type = false;
1495 if ((i != TTM_PL_SYSTEM) && ttm_bo_clean_mm(bdev, i)) {
1496 ret = -EBUSY;
1497 printk(KERN_ERR TTM_PFX
1498 "DRM memory manager type %d "
1499 "is not clean.\n", i);
1500 }
1501 man->has_type = false;
1502 }
1503 }
1504
1505 mutex_lock(&glob->device_list_mutex);
1506 list_del(&bdev->device_list);
1507 mutex_unlock(&glob->device_list_mutex);
1508
1509 cancel_delayed_work_sync(&bdev->wq);
1510
1511 while (ttm_bo_delayed_delete(bdev, true))
1512 ;
1513
1514 spin_lock(&glob->lru_lock);
1515 if (list_empty(&bdev->ddestroy))
1516 TTM_DEBUG("Delayed destroy list was clean\n");
1517
1518 if (list_empty(&bdev->man[0].lru))
1519 TTM_DEBUG("Swap list was clean\n");
1520 spin_unlock(&glob->lru_lock);
1521
1522 BUG_ON(!drm_mm_clean(&bdev->addr_space_mm));
1523 write_lock(&bdev->vm_lock);
1524 drm_mm_takedown(&bdev->addr_space_mm);
1525 write_unlock(&bdev->vm_lock);
1526
1527 return ret;
1528}
1529EXPORT_SYMBOL(ttm_bo_device_release);
1530
1531int ttm_bo_device_init(struct ttm_bo_device *bdev,
1532 struct ttm_bo_global *glob,
1533 struct ttm_bo_driver *driver,
1534 uint64_t file_page_offset,
1535 bool need_dma32)
1536{
1537 int ret = -EINVAL;
1538
1539 rwlock_init(&bdev->vm_lock);
1540 bdev->driver = driver;
1541
1542 memset(bdev->man, 0, sizeof(bdev->man));
1543
1544 /*
1545 * Initialize the system memory buffer type.
1546 * Other types need to be driver / IOCTL initialized.
1547 */
1548 ret = ttm_bo_init_mm(bdev, TTM_PL_SYSTEM, 0);
1549 if (unlikely(ret != 0))
1550 goto out_no_sys;
1551
1552 bdev->addr_space_rb = RB_ROOT;
1553 ret = drm_mm_init(&bdev->addr_space_mm, file_page_offset, 0x10000000);
1554 if (unlikely(ret != 0))
1555 goto out_no_addr_mm;
1556
1557 INIT_DELAYED_WORK(&bdev->wq, ttm_bo_delayed_workqueue);
1558 bdev->nice_mode = true;
1559 INIT_LIST_HEAD(&bdev->ddestroy);
1560 bdev->dev_mapping = NULL;
1561 bdev->glob = glob;
1562 bdev->need_dma32 = need_dma32;
1563 bdev->val_seq = 0;
1564 spin_lock_init(&bdev->fence_lock);
1565 mutex_lock(&glob->device_list_mutex);
1566 list_add_tail(&bdev->device_list, &glob->device_list);
1567 mutex_unlock(&glob->device_list_mutex);
1568
1569 return 0;
1570out_no_addr_mm:
1571 ttm_bo_clean_mm(bdev, 0);
1572out_no_sys:
1573 return ret;
1574}
1575EXPORT_SYMBOL(ttm_bo_device_init);
1576
1577/*
1578 * buffer object vm functions.
1579 */
1580
1581bool ttm_mem_reg_is_pci(struct ttm_bo_device *bdev, struct ttm_mem_reg *mem)
1582{
1583 struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
1584
1585 if (!(man->flags & TTM_MEMTYPE_FLAG_FIXED)) {
1586 if (mem->mem_type == TTM_PL_SYSTEM)
1587 return false;
1588
1589 if (man->flags & TTM_MEMTYPE_FLAG_CMA)
1590 return false;
1591
1592 if (mem->placement & TTM_PL_FLAG_CACHED)
1593 return false;
1594 }
1595 return true;
1596}
1597
1598void ttm_bo_unmap_virtual_locked(struct ttm_buffer_object *bo)
1599{
1600 struct ttm_bo_device *bdev = bo->bdev;
1601 loff_t offset = (loff_t) bo->addr_space_offset;
1602 loff_t holelen = ((loff_t) bo->mem.num_pages) << PAGE_SHIFT;
1603
1604 if (!bdev->dev_mapping)
1605 return;
1606 unmap_mapping_range(bdev->dev_mapping, offset, holelen, 1);
1607 ttm_mem_io_free_vm(bo);
1608}
1609
1610void ttm_bo_unmap_virtual(struct ttm_buffer_object *bo)
1611{
1612 struct ttm_bo_device *bdev = bo->bdev;
1613 struct ttm_mem_type_manager *man = &bdev->man[bo->mem.mem_type];
1614
1615 ttm_mem_io_lock(man, false);
1616 ttm_bo_unmap_virtual_locked(bo);
1617 ttm_mem_io_unlock(man);
1618}
1619
1620
1621EXPORT_SYMBOL(ttm_bo_unmap_virtual);
1622
1623static void ttm_bo_vm_insert_rb(struct ttm_buffer_object *bo)
1624{
1625 struct ttm_bo_device *bdev = bo->bdev;
1626 struct rb_node **cur = &bdev->addr_space_rb.rb_node;
1627 struct rb_node *parent = NULL;
1628 struct ttm_buffer_object *cur_bo;
1629 unsigned long offset = bo->vm_node->start;
1630 unsigned long cur_offset;
1631
1632 while (*cur) {
1633 parent = *cur;
1634 cur_bo = rb_entry(parent, struct ttm_buffer_object, vm_rb);
1635 cur_offset = cur_bo->vm_node->start;
1636 if (offset < cur_offset)
1637 cur = &parent->rb_left;
1638 else if (offset > cur_offset)
1639 cur = &parent->rb_right;
1640 else
1641 BUG();
1642 }
1643
1644 rb_link_node(&bo->vm_rb, parent, cur);
1645 rb_insert_color(&bo->vm_rb, &bdev->addr_space_rb);
1646}
1647
1648/**
1649 * ttm_bo_setup_vm:
1650 *
1651 * @bo: the buffer to allocate address space for
1652 *
1653 * Allocate address space in the drm device so that applications
1654 * can mmap the buffer and access the contents. This only
1655 * applies to ttm_bo_type_device objects as others are not
1656 * placed in the drm device address space.
1657 */
1658
1659static int ttm_bo_setup_vm(struct ttm_buffer_object *bo)
1660{
1661 struct ttm_bo_device *bdev = bo->bdev;
1662 int ret;
1663
1664retry_pre_get:
1665 ret = drm_mm_pre_get(&bdev->addr_space_mm);
1666 if (unlikely(ret != 0))
1667 return ret;
1668
1669 write_lock(&bdev->vm_lock);
1670 bo->vm_node = drm_mm_search_free(&bdev->addr_space_mm,
1671 bo->mem.num_pages, 0, 0);
1672
1673 if (unlikely(bo->vm_node == NULL)) {
1674 ret = -ENOMEM;
1675 goto out_unlock;
1676 }
1677
1678 bo->vm_node = drm_mm_get_block_atomic(bo->vm_node,
1679 bo->mem.num_pages, 0);
1680
1681 if (unlikely(bo->vm_node == NULL)) {
1682 write_unlock(&bdev->vm_lock);
1683 goto retry_pre_get;
1684 }
1685
1686 ttm_bo_vm_insert_rb(bo);
1687 write_unlock(&bdev->vm_lock);
1688 bo->addr_space_offset = ((uint64_t) bo->vm_node->start) << PAGE_SHIFT;
1689
1690 return 0;
1691out_unlock:
1692 write_unlock(&bdev->vm_lock);
1693 return ret;
1694}
1695
1696int ttm_bo_wait(struct ttm_buffer_object *bo,
1697 bool lazy, bool interruptible, bool no_wait)
1698{
1699 struct ttm_bo_driver *driver = bo->bdev->driver;
1700 struct ttm_bo_device *bdev = bo->bdev;
1701 void *sync_obj;
1702 void *sync_obj_arg;
1703 int ret = 0;
1704
1705 if (likely(bo->sync_obj == NULL))
1706 return 0;
1707
1708 while (bo->sync_obj) {
1709
1710 if (driver->sync_obj_signaled(bo->sync_obj, bo->sync_obj_arg)) {
1711 void *tmp_obj = bo->sync_obj;
1712 bo->sync_obj = NULL;
1713 clear_bit(TTM_BO_PRIV_FLAG_MOVING, &bo->priv_flags);
1714 spin_unlock(&bdev->fence_lock);
1715 driver->sync_obj_unref(&tmp_obj);
1716 spin_lock(&bdev->fence_lock);
1717 continue;
1718 }
1719
1720 if (no_wait)
1721 return -EBUSY;
1722
1723 sync_obj = driver->sync_obj_ref(bo->sync_obj);
1724 sync_obj_arg = bo->sync_obj_arg;
1725 spin_unlock(&bdev->fence_lock);
1726 ret = driver->sync_obj_wait(sync_obj, sync_obj_arg,
1727 lazy, interruptible);
1728 if (unlikely(ret != 0)) {
1729 driver->sync_obj_unref(&sync_obj);
1730 spin_lock(&bdev->fence_lock);
1731 return ret;
1732 }
1733 spin_lock(&bdev->fence_lock);
1734 if (likely(bo->sync_obj == sync_obj &&
1735 bo->sync_obj_arg == sync_obj_arg)) {
1736 void *tmp_obj = bo->sync_obj;
1737 bo->sync_obj = NULL;
1738 clear_bit(TTM_BO_PRIV_FLAG_MOVING,
1739 &bo->priv_flags);
1740 spin_unlock(&bdev->fence_lock);
1741 driver->sync_obj_unref(&sync_obj);
1742 driver->sync_obj_unref(&tmp_obj);
1743 spin_lock(&bdev->fence_lock);
1744 } else {
1745 spin_unlock(&bdev->fence_lock);
1746 driver->sync_obj_unref(&sync_obj);
1747 spin_lock(&bdev->fence_lock);
1748 }
1749 }
1750 return 0;
1751}
1752EXPORT_SYMBOL(ttm_bo_wait);
1753
1754int ttm_bo_synccpu_write_grab(struct ttm_buffer_object *bo, bool no_wait)
1755{
1756 struct ttm_bo_device *bdev = bo->bdev;
1757 int ret = 0;
1758
1759 /*
1760 * Using ttm_bo_reserve makes sure the lru lists are updated.
1761 */
1762
1763 ret = ttm_bo_reserve(bo, true, no_wait, false, 0);
1764 if (unlikely(ret != 0))
1765 return ret;
1766 spin_lock(&bdev->fence_lock);
1767 ret = ttm_bo_wait(bo, false, true, no_wait);
1768 spin_unlock(&bdev->fence_lock);
1769 if (likely(ret == 0))
1770 atomic_inc(&bo->cpu_writers);
1771 ttm_bo_unreserve(bo);
1772 return ret;
1773}
1774EXPORT_SYMBOL(ttm_bo_synccpu_write_grab);
1775
1776void ttm_bo_synccpu_write_release(struct ttm_buffer_object *bo)
1777{
1778 if (atomic_dec_and_test(&bo->cpu_writers))
1779 wake_up_all(&bo->event_queue);
1780}
1781EXPORT_SYMBOL(ttm_bo_synccpu_write_release);
1782
1783/**
1784 * A buffer object shrink method that tries to swap out the first
1785 * buffer object on the bo_global::swap_lru list.
1786 */
1787
1788static int ttm_bo_swapout(struct ttm_mem_shrink *shrink)
1789{
1790 struct ttm_bo_global *glob =
1791 container_of(shrink, struct ttm_bo_global, shrink);
1792 struct ttm_buffer_object *bo;
1793 int ret = -EBUSY;
1794 int put_count;
1795 uint32_t swap_placement = (TTM_PL_FLAG_CACHED | TTM_PL_FLAG_SYSTEM);
1796
1797 spin_lock(&glob->lru_lock);
1798 while (ret == -EBUSY) {
1799 if (unlikely(list_empty(&glob->swap_lru))) {
1800 spin_unlock(&glob->lru_lock);
1801 return -EBUSY;
1802 }
1803
1804 bo = list_first_entry(&glob->swap_lru,
1805 struct ttm_buffer_object, swap);
1806 kref_get(&bo->list_kref);
1807
1808 if (!list_empty(&bo->ddestroy)) {
1809 spin_unlock(&glob->lru_lock);
1810 (void) ttm_bo_cleanup_refs(bo, false, false, false);
1811 kref_put(&bo->list_kref, ttm_bo_release_list);
1812 continue;
1813 }
1814
1815 /**
1816 * Reserve buffer. Since we unlock while sleeping, we need
1817 * to re-check that nobody removed us from the swap-list while
1818 * we slept.
1819 */
1820
1821 ret = ttm_bo_reserve_locked(bo, false, true, false, 0);
1822 if (unlikely(ret == -EBUSY)) {
1823 spin_unlock(&glob->lru_lock);
1824 ttm_bo_wait_unreserved(bo, false);
1825 kref_put(&bo->list_kref, ttm_bo_release_list);
1826 spin_lock(&glob->lru_lock);
1827 }
1828 }
1829
1830 BUG_ON(ret != 0);
1831 put_count = ttm_bo_del_from_lru(bo);
1832 spin_unlock(&glob->lru_lock);
1833
1834 ttm_bo_list_ref_sub(bo, put_count, true);
1835
1836 /**
1837 * Wait for GPU, then move to system cached.
1838 */
1839
1840 spin_lock(&bo->bdev->fence_lock);
1841 ret = ttm_bo_wait(bo, false, false, false);
1842 spin_unlock(&bo->bdev->fence_lock);
1843
1844 if (unlikely(ret != 0))
1845 goto out;
1846
1847 if ((bo->mem.placement & swap_placement) != swap_placement) {
1848 struct ttm_mem_reg evict_mem;
1849
1850 evict_mem = bo->mem;
1851 evict_mem.mm_node = NULL;
1852 evict_mem.placement = TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED;
1853 evict_mem.mem_type = TTM_PL_SYSTEM;
1854
1855 ret = ttm_bo_handle_move_mem(bo, &evict_mem, true,
1856 false, false, false);
1857 if (unlikely(ret != 0))
1858 goto out;
1859 }
1860
1861 ttm_bo_unmap_virtual(bo);
1862
1863 /**
1864 * Swap out. Buffer will be swapped in again as soon as
1865 * anyone tries to access a ttm page.
1866 */
1867
1868 if (bo->bdev->driver->swap_notify)
1869 bo->bdev->driver->swap_notify(bo);
1870
1871 ret = ttm_tt_swapout(bo->ttm, bo->persistent_swap_storage);
1872out:
1873
1874 /**
1875 *
1876 * Unreserve without putting on LRU to avoid swapping out an
1877 * already swapped buffer.
1878 */
1879
1880 atomic_set(&bo->reserved, 0);
1881 wake_up_all(&bo->event_queue);
1882 kref_put(&bo->list_kref, ttm_bo_release_list);
1883 return ret;
1884}
1885
1886void ttm_bo_swapout_all(struct ttm_bo_device *bdev)
1887{
1888 while (ttm_bo_swapout(&bdev->glob->shrink) == 0)
1889 ;
1890}
1891EXPORT_SYMBOL(ttm_bo_swapout_all);
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/dma-resv.h>
45
46static void ttm_bo_global_kobj_release(struct kobject *kobj);
47
48/**
49 * ttm_global_mutex - protecting the global BO state
50 */
51DEFINE_MUTEX(ttm_global_mutex);
52unsigned ttm_bo_glob_use_count;
53struct ttm_bo_global ttm_bo_glob;
54EXPORT_SYMBOL(ttm_bo_glob);
55
56static struct attribute ttm_bo_count = {
57 .name = "bo_count",
58 .mode = S_IRUGO
59};
60
61/* default destructor */
62static void ttm_bo_default_destroy(struct ttm_buffer_object *bo)
63{
64 kfree(bo);
65}
66
67static inline int ttm_mem_type_from_place(const struct ttm_place *place,
68 uint32_t *mem_type)
69{
70 int pos;
71
72 pos = ffs(place->flags & TTM_PL_MASK_MEM);
73 if (unlikely(!pos))
74 return -EINVAL;
75
76 *mem_type = pos - 1;
77 return 0;
78}
79
80static void ttm_mem_type_debug(struct ttm_bo_device *bdev, struct drm_printer *p,
81 int mem_type)
82{
83 struct ttm_mem_type_manager *man = &bdev->man[mem_type];
84
85 drm_printf(p, " has_type: %d\n", man->has_type);
86 drm_printf(p, " use_type: %d\n", man->use_type);
87 drm_printf(p, " flags: 0x%08X\n", man->flags);
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
95static 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
115static 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
126static struct attribute *ttm_bo_global_attrs[] = {
127 &ttm_bo_count,
128 NULL
129};
130
131static const struct sysfs_ops ttm_bo_global_ops = {
132 .show = &ttm_bo_global_show
133};
134
135static 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
142static inline uint32_t ttm_bo_type_flags(unsigned type)
143{
144 return 1 << (type);
145}
146
147static void ttm_bo_add_mem_to_lru(struct ttm_buffer_object *bo,
148 struct ttm_mem_reg *mem)
149{
150 struct ttm_bo_device *bdev = bo->bdev;
151 struct ttm_mem_type_manager *man;
152
153 if (!list_empty(&bo->lru))
154 return;
155
156 if (mem->placement & TTM_PL_FLAG_NO_EVICT)
157 return;
158
159 man = &bdev->man[mem->mem_type];
160 list_add_tail(&bo->lru, &man->lru[bo->priority]);
161
162 if (!(man->flags & TTM_MEMTYPE_FLAG_FIXED) && bo->ttm &&
163 !(bo->ttm->page_flags & (TTM_PAGE_FLAG_SG |
164 TTM_PAGE_FLAG_SWAPPED))) {
165 list_add_tail(&bo->swap, &ttm_bo_glob.swap_lru[bo->priority]);
166 }
167}
168
169static void ttm_bo_del_from_lru(struct ttm_buffer_object *bo)
170{
171 struct ttm_bo_device *bdev = bo->bdev;
172 bool notify = false;
173
174 if (!list_empty(&bo->swap)) {
175 list_del_init(&bo->swap);
176 notify = true;
177 }
178 if (!list_empty(&bo->lru)) {
179 list_del_init(&bo->lru);
180 notify = true;
181 }
182
183 if (notify && bdev->driver->del_from_lru_notify)
184 bdev->driver->del_from_lru_notify(bo);
185}
186
187static void ttm_bo_bulk_move_set_pos(struct ttm_lru_bulk_move_pos *pos,
188 struct ttm_buffer_object *bo)
189{
190 if (!pos->first)
191 pos->first = bo;
192 pos->last = bo;
193}
194
195void ttm_bo_move_to_lru_tail(struct ttm_buffer_object *bo,
196 struct ttm_lru_bulk_move *bulk)
197{
198 dma_resv_assert_held(bo->base.resv);
199
200 ttm_bo_del_from_lru(bo);
201 ttm_bo_add_mem_to_lru(bo, &bo->mem);
202
203 if (bulk && !(bo->mem.placement & TTM_PL_FLAG_NO_EVICT)) {
204 switch (bo->mem.mem_type) {
205 case TTM_PL_TT:
206 ttm_bo_bulk_move_set_pos(&bulk->tt[bo->priority], bo);
207 break;
208
209 case TTM_PL_VRAM:
210 ttm_bo_bulk_move_set_pos(&bulk->vram[bo->priority], bo);
211 break;
212 }
213 if (bo->ttm && !(bo->ttm->page_flags &
214 (TTM_PAGE_FLAG_SG | TTM_PAGE_FLAG_SWAPPED)))
215 ttm_bo_bulk_move_set_pos(&bulk->swap[bo->priority], bo);
216 }
217}
218EXPORT_SYMBOL(ttm_bo_move_to_lru_tail);
219
220void ttm_bo_bulk_move_lru_tail(struct ttm_lru_bulk_move *bulk)
221{
222 unsigned i;
223
224 for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i) {
225 struct ttm_lru_bulk_move_pos *pos = &bulk->tt[i];
226 struct ttm_mem_type_manager *man;
227
228 if (!pos->first)
229 continue;
230
231 dma_resv_assert_held(pos->first->base.resv);
232 dma_resv_assert_held(pos->last->base.resv);
233
234 man = &pos->first->bdev->man[TTM_PL_TT];
235 list_bulk_move_tail(&man->lru[i], &pos->first->lru,
236 &pos->last->lru);
237 }
238
239 for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i) {
240 struct ttm_lru_bulk_move_pos *pos = &bulk->vram[i];
241 struct ttm_mem_type_manager *man;
242
243 if (!pos->first)
244 continue;
245
246 dma_resv_assert_held(pos->first->base.resv);
247 dma_resv_assert_held(pos->last->base.resv);
248
249 man = &pos->first->bdev->man[TTM_PL_VRAM];
250 list_bulk_move_tail(&man->lru[i], &pos->first->lru,
251 &pos->last->lru);
252 }
253
254 for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i) {
255 struct ttm_lru_bulk_move_pos *pos = &bulk->swap[i];
256 struct list_head *lru;
257
258 if (!pos->first)
259 continue;
260
261 dma_resv_assert_held(pos->first->base.resv);
262 dma_resv_assert_held(pos->last->base.resv);
263
264 lru = &ttm_bo_glob.swap_lru[i];
265 list_bulk_move_tail(lru, &pos->first->swap, &pos->last->swap);
266 }
267}
268EXPORT_SYMBOL(ttm_bo_bulk_move_lru_tail);
269
270static int ttm_bo_handle_move_mem(struct ttm_buffer_object *bo,
271 struct ttm_mem_reg *mem, bool evict,
272 struct ttm_operation_ctx *ctx)
273{
274 struct ttm_bo_device *bdev = bo->bdev;
275 struct ttm_mem_type_manager *old_man = &bdev->man[bo->mem.mem_type];
276 struct ttm_mem_type_manager *new_man = &bdev->man[mem->mem_type];
277 int ret;
278
279 ret = ttm_mem_io_lock(old_man, true);
280 if (unlikely(ret != 0))
281 goto out_err;
282 ttm_bo_unmap_virtual_locked(bo);
283 ttm_mem_io_unlock(old_man);
284
285 /*
286 * Create and bind a ttm if required.
287 */
288
289 if (!(new_man->flags & TTM_MEMTYPE_FLAG_FIXED)) {
290 if (bo->ttm == NULL) {
291 bool zero = !(old_man->flags & TTM_MEMTYPE_FLAG_FIXED);
292 ret = ttm_tt_create(bo, zero);
293 if (ret)
294 goto out_err;
295 }
296
297 ret = ttm_tt_set_placement_caching(bo->ttm, mem->placement);
298 if (ret)
299 goto out_err;
300
301 if (mem->mem_type != TTM_PL_SYSTEM) {
302 ret = ttm_tt_bind(bo->ttm, mem, ctx);
303 if (ret)
304 goto out_err;
305 }
306
307 if (bo->mem.mem_type == TTM_PL_SYSTEM) {
308 if (bdev->driver->move_notify)
309 bdev->driver->move_notify(bo, evict, mem);
310 bo->mem = *mem;
311 goto moved;
312 }
313 }
314
315 if (bdev->driver->move_notify)
316 bdev->driver->move_notify(bo, evict, mem);
317
318 if (!(old_man->flags & TTM_MEMTYPE_FLAG_FIXED) &&
319 !(new_man->flags & TTM_MEMTYPE_FLAG_FIXED))
320 ret = ttm_bo_move_ttm(bo, ctx, mem);
321 else if (bdev->driver->move)
322 ret = bdev->driver->move(bo, evict, ctx, mem);
323 else
324 ret = ttm_bo_move_memcpy(bo, ctx, mem);
325
326 if (ret) {
327 if (bdev->driver->move_notify) {
328 swap(*mem, bo->mem);
329 bdev->driver->move_notify(bo, false, mem);
330 swap(*mem, bo->mem);
331 }
332
333 goto out_err;
334 }
335
336moved:
337 bo->evicted = false;
338
339 ctx->bytes_moved += bo->num_pages << PAGE_SHIFT;
340 return 0;
341
342out_err:
343 new_man = &bdev->man[bo->mem.mem_type];
344 if (new_man->flags & TTM_MEMTYPE_FLAG_FIXED) {
345 ttm_tt_destroy(bo->ttm);
346 bo->ttm = NULL;
347 }
348
349 return ret;
350}
351
352/**
353 * Call bo::reserved.
354 * Will release GPU memory type usage on destruction.
355 * This is the place to put in driver specific hooks to release
356 * driver private resources.
357 * Will release the bo::reserved lock.
358 */
359
360static void ttm_bo_cleanup_memtype_use(struct ttm_buffer_object *bo)
361{
362 if (bo->bdev->driver->move_notify)
363 bo->bdev->driver->move_notify(bo, false, NULL);
364
365 ttm_tt_destroy(bo->ttm);
366 bo->ttm = NULL;
367 ttm_bo_mem_put(bo, &bo->mem);
368}
369
370static int ttm_bo_individualize_resv(struct ttm_buffer_object *bo)
371{
372 int r;
373
374 if (bo->base.resv == &bo->base._resv)
375 return 0;
376
377 BUG_ON(!dma_resv_trylock(&bo->base._resv));
378
379 r = dma_resv_copy_fences(&bo->base._resv, bo->base.resv);
380 dma_resv_unlock(&bo->base._resv);
381 if (r)
382 return r;
383
384 if (bo->type != ttm_bo_type_sg) {
385 /* This works because the BO is about to be destroyed and nobody
386 * reference it any more. The only tricky case is the trylock on
387 * the resv object while holding the lru_lock.
388 */
389 spin_lock(&ttm_bo_glob.lru_lock);
390 bo->base.resv = &bo->base._resv;
391 spin_unlock(&ttm_bo_glob.lru_lock);
392 }
393
394 return r;
395}
396
397static void ttm_bo_flush_all_fences(struct ttm_buffer_object *bo)
398{
399 struct dma_resv *resv = &bo->base._resv;
400 struct dma_resv_list *fobj;
401 struct dma_fence *fence;
402 int i;
403
404 rcu_read_lock();
405 fobj = rcu_dereference(resv->fence);
406 fence = rcu_dereference(resv->fence_excl);
407 if (fence && !fence->ops->signaled)
408 dma_fence_enable_sw_signaling(fence);
409
410 for (i = 0; fobj && i < fobj->shared_count; ++i) {
411 fence = rcu_dereference(fobj->shared[i]);
412
413 if (!fence->ops->signaled)
414 dma_fence_enable_sw_signaling(fence);
415 }
416 rcu_read_unlock();
417}
418
419/**
420 * function ttm_bo_cleanup_refs
421 * If bo idle, remove from lru lists, and unref.
422 * If not idle, block if possible.
423 *
424 * Must be called with lru_lock and reservation held, this function
425 * will drop the lru lock and optionally the reservation lock before returning.
426 *
427 * @interruptible Any sleeps should occur interruptibly.
428 * @no_wait_gpu Never wait for gpu. Return -EBUSY instead.
429 * @unlock_resv Unlock the reservation lock as well.
430 */
431
432static int ttm_bo_cleanup_refs(struct ttm_buffer_object *bo,
433 bool interruptible, bool no_wait_gpu,
434 bool unlock_resv)
435{
436 struct dma_resv *resv = &bo->base._resv;
437 int ret;
438
439 if (dma_resv_test_signaled_rcu(resv, true))
440 ret = 0;
441 else
442 ret = -EBUSY;
443
444 if (ret && !no_wait_gpu) {
445 long lret;
446
447 if (unlock_resv)
448 dma_resv_unlock(bo->base.resv);
449 spin_unlock(&ttm_bo_glob.lru_lock);
450
451 lret = dma_resv_wait_timeout_rcu(resv, true, interruptible,
452 30 * HZ);
453
454 if (lret < 0)
455 return lret;
456 else if (lret == 0)
457 return -EBUSY;
458
459 spin_lock(&ttm_bo_glob.lru_lock);
460 if (unlock_resv && !dma_resv_trylock(bo->base.resv)) {
461 /*
462 * We raced, and lost, someone else holds the reservation now,
463 * and is probably busy in ttm_bo_cleanup_memtype_use.
464 *
465 * Even if it's not the case, because we finished waiting any
466 * delayed destruction would succeed, so just return success
467 * here.
468 */
469 spin_unlock(&ttm_bo_glob.lru_lock);
470 return 0;
471 }
472 ret = 0;
473 }
474
475 if (ret || unlikely(list_empty(&bo->ddestroy))) {
476 if (unlock_resv)
477 dma_resv_unlock(bo->base.resv);
478 spin_unlock(&ttm_bo_glob.lru_lock);
479 return ret;
480 }
481
482 ttm_bo_del_from_lru(bo);
483 list_del_init(&bo->ddestroy);
484 spin_unlock(&ttm_bo_glob.lru_lock);
485 ttm_bo_cleanup_memtype_use(bo);
486
487 if (unlock_resv)
488 dma_resv_unlock(bo->base.resv);
489
490 ttm_bo_put(bo);
491
492 return 0;
493}
494
495/**
496 * Traverse the delayed list, and call ttm_bo_cleanup_refs on all
497 * encountered buffers.
498 */
499static bool ttm_bo_delayed_delete(struct ttm_bo_device *bdev, bool remove_all)
500{
501 struct ttm_bo_global *glob = &ttm_bo_glob;
502 struct list_head removed;
503 bool empty;
504
505 INIT_LIST_HEAD(&removed);
506
507 spin_lock(&glob->lru_lock);
508 while (!list_empty(&bdev->ddestroy)) {
509 struct ttm_buffer_object *bo;
510
511 bo = list_first_entry(&bdev->ddestroy, struct ttm_buffer_object,
512 ddestroy);
513 list_move_tail(&bo->ddestroy, &removed);
514 if (!ttm_bo_get_unless_zero(bo))
515 continue;
516
517 if (remove_all || bo->base.resv != &bo->base._resv) {
518 spin_unlock(&glob->lru_lock);
519 dma_resv_lock(bo->base.resv, NULL);
520
521 spin_lock(&glob->lru_lock);
522 ttm_bo_cleanup_refs(bo, false, !remove_all, true);
523
524 } else if (dma_resv_trylock(bo->base.resv)) {
525 ttm_bo_cleanup_refs(bo, false, !remove_all, true);
526 } else {
527 spin_unlock(&glob->lru_lock);
528 }
529
530 ttm_bo_put(bo);
531 spin_lock(&glob->lru_lock);
532 }
533 list_splice_tail(&removed, &bdev->ddestroy);
534 empty = list_empty(&bdev->ddestroy);
535 spin_unlock(&glob->lru_lock);
536
537 return empty;
538}
539
540static void ttm_bo_delayed_workqueue(struct work_struct *work)
541{
542 struct ttm_bo_device *bdev =
543 container_of(work, struct ttm_bo_device, wq.work);
544
545 if (!ttm_bo_delayed_delete(bdev, false))
546 schedule_delayed_work(&bdev->wq,
547 ((HZ / 100) < 1) ? 1 : HZ / 100);
548}
549
550static void ttm_bo_release(struct kref *kref)
551{
552 struct ttm_buffer_object *bo =
553 container_of(kref, struct ttm_buffer_object, kref);
554 struct ttm_bo_device *bdev = bo->bdev;
555 struct ttm_mem_type_manager *man = &bdev->man[bo->mem.mem_type];
556 size_t acc_size = bo->acc_size;
557 int ret;
558
559 if (!bo->deleted) {
560 ret = ttm_bo_individualize_resv(bo);
561 if (ret) {
562 /* Last resort, if we fail to allocate memory for the
563 * fences block for the BO to become idle
564 */
565 dma_resv_wait_timeout_rcu(bo->base.resv, true, false,
566 30 * HZ);
567 }
568
569 if (bo->bdev->driver->release_notify)
570 bo->bdev->driver->release_notify(bo);
571
572 drm_vma_offset_remove(bdev->vma_manager, &bo->base.vma_node);
573 ttm_mem_io_lock(man, false);
574 ttm_mem_io_free_vm(bo);
575 ttm_mem_io_unlock(man);
576 }
577
578 if (!dma_resv_test_signaled_rcu(bo->base.resv, true) ||
579 !dma_resv_trylock(bo->base.resv)) {
580 /* The BO is not idle, resurrect it for delayed destroy */
581 ttm_bo_flush_all_fences(bo);
582 bo->deleted = true;
583
584 spin_lock(&ttm_bo_glob.lru_lock);
585
586 /*
587 * Make NO_EVICT bos immediately available to
588 * shrinkers, now that they are queued for
589 * destruction.
590 */
591 if (bo->mem.placement & TTM_PL_FLAG_NO_EVICT) {
592 bo->mem.placement &= ~TTM_PL_FLAG_NO_EVICT;
593 ttm_bo_del_from_lru(bo);
594 ttm_bo_add_mem_to_lru(bo, &bo->mem);
595 }
596
597 kref_init(&bo->kref);
598 list_add_tail(&bo->ddestroy, &bdev->ddestroy);
599 spin_unlock(&ttm_bo_glob.lru_lock);
600
601 schedule_delayed_work(&bdev->wq,
602 ((HZ / 100) < 1) ? 1 : HZ / 100);
603 return;
604 }
605
606 spin_lock(&ttm_bo_glob.lru_lock);
607 ttm_bo_del_from_lru(bo);
608 list_del(&bo->ddestroy);
609 spin_unlock(&ttm_bo_glob.lru_lock);
610
611 ttm_bo_cleanup_memtype_use(bo);
612 dma_resv_unlock(bo->base.resv);
613
614 atomic_dec(&ttm_bo_glob.bo_count);
615 dma_fence_put(bo->moving);
616 if (!ttm_bo_uses_embedded_gem_object(bo))
617 dma_resv_fini(&bo->base._resv);
618 bo->destroy(bo);
619 ttm_mem_global_free(&ttm_mem_glob, acc_size);
620}
621
622void ttm_bo_put(struct ttm_buffer_object *bo)
623{
624 kref_put(&bo->kref, ttm_bo_release);
625}
626EXPORT_SYMBOL(ttm_bo_put);
627
628int ttm_bo_lock_delayed_workqueue(struct ttm_bo_device *bdev)
629{
630 return cancel_delayed_work_sync(&bdev->wq);
631}
632EXPORT_SYMBOL(ttm_bo_lock_delayed_workqueue);
633
634void ttm_bo_unlock_delayed_workqueue(struct ttm_bo_device *bdev, int resched)
635{
636 if (resched)
637 schedule_delayed_work(&bdev->wq,
638 ((HZ / 100) < 1) ? 1 : HZ / 100);
639}
640EXPORT_SYMBOL(ttm_bo_unlock_delayed_workqueue);
641
642static int ttm_bo_evict(struct ttm_buffer_object *bo,
643 struct ttm_operation_ctx *ctx)
644{
645 struct ttm_bo_device *bdev = bo->bdev;
646 struct ttm_mem_reg evict_mem;
647 struct ttm_placement placement;
648 int ret = 0;
649
650 dma_resv_assert_held(bo->base.resv);
651
652 placement.num_placement = 0;
653 placement.num_busy_placement = 0;
654 bdev->driver->evict_flags(bo, &placement);
655
656 if (!placement.num_placement && !placement.num_busy_placement) {
657 ret = ttm_bo_pipeline_gutting(bo);
658 if (ret)
659 return ret;
660
661 return ttm_tt_create(bo, false);
662 }
663
664 evict_mem = bo->mem;
665 evict_mem.mm_node = NULL;
666 evict_mem.bus.io_reserved_vm = false;
667 evict_mem.bus.io_reserved_count = 0;
668
669 ret = ttm_bo_mem_space(bo, &placement, &evict_mem, ctx);
670 if (ret) {
671 if (ret != -ERESTARTSYS) {
672 pr_err("Failed to find memory space for buffer 0x%p eviction\n",
673 bo);
674 ttm_bo_mem_space_debug(bo, &placement);
675 }
676 goto out;
677 }
678
679 ret = ttm_bo_handle_move_mem(bo, &evict_mem, true, ctx);
680 if (unlikely(ret)) {
681 if (ret != -ERESTARTSYS)
682 pr_err("Buffer eviction failed\n");
683 ttm_bo_mem_put(bo, &evict_mem);
684 goto out;
685 }
686 bo->evicted = true;
687out:
688 return ret;
689}
690
691bool ttm_bo_eviction_valuable(struct ttm_buffer_object *bo,
692 const struct ttm_place *place)
693{
694 /* Don't evict this BO if it's outside of the
695 * requested placement range
696 */
697 if (place->fpfn >= (bo->mem.start + bo->mem.size) ||
698 (place->lpfn && place->lpfn <= bo->mem.start))
699 return false;
700
701 return true;
702}
703EXPORT_SYMBOL(ttm_bo_eviction_valuable);
704
705/**
706 * Check the target bo is allowable to be evicted or swapout, including cases:
707 *
708 * a. if share same reservation object with ctx->resv, have assumption
709 * reservation objects should already be locked, so not lock again and
710 * return true directly when either the opreation allow_reserved_eviction
711 * or the target bo already is in delayed free list;
712 *
713 * b. Otherwise, trylock it.
714 */
715static bool ttm_bo_evict_swapout_allowable(struct ttm_buffer_object *bo,
716 struct ttm_operation_ctx *ctx, bool *locked, bool *busy)
717{
718 bool ret = false;
719
720 if (bo->base.resv == ctx->resv) {
721 dma_resv_assert_held(bo->base.resv);
722 if (ctx->flags & TTM_OPT_FLAG_ALLOW_RES_EVICT)
723 ret = true;
724 *locked = false;
725 if (busy)
726 *busy = false;
727 } else {
728 ret = dma_resv_trylock(bo->base.resv);
729 *locked = ret;
730 if (busy)
731 *busy = !ret;
732 }
733
734 return ret;
735}
736
737/**
738 * ttm_mem_evict_wait_busy - wait for a busy BO to become available
739 *
740 * @busy_bo: BO which couldn't be locked with trylock
741 * @ctx: operation context
742 * @ticket: acquire ticket
743 *
744 * Try to lock a busy buffer object to avoid failing eviction.
745 */
746static int ttm_mem_evict_wait_busy(struct ttm_buffer_object *busy_bo,
747 struct ttm_operation_ctx *ctx,
748 struct ww_acquire_ctx *ticket)
749{
750 int r;
751
752 if (!busy_bo || !ticket)
753 return -EBUSY;
754
755 if (ctx->interruptible)
756 r = dma_resv_lock_interruptible(busy_bo->base.resv,
757 ticket);
758 else
759 r = dma_resv_lock(busy_bo->base.resv, ticket);
760
761 /*
762 * TODO: It would be better to keep the BO locked until allocation is at
763 * least tried one more time, but that would mean a much larger rework
764 * of TTM.
765 */
766 if (!r)
767 dma_resv_unlock(busy_bo->base.resv);
768
769 return r == -EDEADLK ? -EBUSY : r;
770}
771
772static int ttm_mem_evict_first(struct ttm_bo_device *bdev,
773 uint32_t mem_type,
774 const struct ttm_place *place,
775 struct ttm_operation_ctx *ctx,
776 struct ww_acquire_ctx *ticket)
777{
778 struct ttm_buffer_object *bo = NULL, *busy_bo = NULL;
779 struct ttm_mem_type_manager *man = &bdev->man[mem_type];
780 bool locked = false;
781 unsigned i;
782 int ret;
783
784 spin_lock(&ttm_bo_glob.lru_lock);
785 for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i) {
786 list_for_each_entry(bo, &man->lru[i], lru) {
787 bool busy;
788
789 if (!ttm_bo_evict_swapout_allowable(bo, ctx, &locked,
790 &busy)) {
791 if (busy && !busy_bo && ticket !=
792 dma_resv_locking_ctx(bo->base.resv))
793 busy_bo = bo;
794 continue;
795 }
796
797 if (place && !bdev->driver->eviction_valuable(bo,
798 place)) {
799 if (locked)
800 dma_resv_unlock(bo->base.resv);
801 continue;
802 }
803 if (!ttm_bo_get_unless_zero(bo)) {
804 if (locked)
805 dma_resv_unlock(bo->base.resv);
806 continue;
807 }
808 break;
809 }
810
811 /* If the inner loop terminated early, we have our candidate */
812 if (&bo->lru != &man->lru[i])
813 break;
814
815 bo = NULL;
816 }
817
818 if (!bo) {
819 if (busy_bo && !ttm_bo_get_unless_zero(busy_bo))
820 busy_bo = NULL;
821 spin_unlock(&ttm_bo_glob.lru_lock);
822 ret = ttm_mem_evict_wait_busy(busy_bo, ctx, ticket);
823 if (busy_bo)
824 ttm_bo_put(busy_bo);
825 return ret;
826 }
827
828 if (bo->deleted) {
829 ret = ttm_bo_cleanup_refs(bo, ctx->interruptible,
830 ctx->no_wait_gpu, locked);
831 ttm_bo_put(bo);
832 return ret;
833 }
834
835 spin_unlock(&ttm_bo_glob.lru_lock);
836
837 ret = ttm_bo_evict(bo, ctx);
838 if (locked)
839 ttm_bo_unreserve(bo);
840
841 ttm_bo_put(bo);
842 return ret;
843}
844
845static int ttm_bo_mem_get(struct ttm_buffer_object *bo,
846 const struct ttm_place *place,
847 struct ttm_mem_reg *mem)
848{
849 struct ttm_mem_type_manager *man = &bo->bdev->man[mem->mem_type];
850
851 mem->mm_node = NULL;
852 if (!man->func || !man->func->get_node)
853 return 0;
854
855 return man->func->get_node(man, bo, place, mem);
856}
857
858void ttm_bo_mem_put(struct ttm_buffer_object *bo, struct ttm_mem_reg *mem)
859{
860 struct ttm_mem_type_manager *man = &bo->bdev->man[mem->mem_type];
861
862 if (!man->func || !man->func->put_node)
863 return;
864
865 man->func->put_node(man, mem);
866 mem->mm_node = NULL;
867 mem->mem_type = TTM_PL_SYSTEM;
868}
869EXPORT_SYMBOL(ttm_bo_mem_put);
870
871/**
872 * Add the last move fence to the BO and reserve a new shared slot.
873 */
874static int ttm_bo_add_move_fence(struct ttm_buffer_object *bo,
875 struct ttm_mem_type_manager *man,
876 struct ttm_mem_reg *mem,
877 bool no_wait_gpu)
878{
879 struct dma_fence *fence;
880 int ret;
881
882 spin_lock(&man->move_lock);
883 fence = dma_fence_get(man->move);
884 spin_unlock(&man->move_lock);
885
886 if (!fence)
887 return 0;
888
889 if (no_wait_gpu) {
890 dma_fence_put(fence);
891 return -EBUSY;
892 }
893
894 dma_resv_add_shared_fence(bo->base.resv, fence);
895
896 ret = dma_resv_reserve_shared(bo->base.resv, 1);
897 if (unlikely(ret)) {
898 dma_fence_put(fence);
899 return ret;
900 }
901
902 dma_fence_put(bo->moving);
903 bo->moving = fence;
904 return 0;
905}
906
907/**
908 * Repeatedly evict memory from the LRU for @mem_type until we create enough
909 * space, or we've evicted everything and there isn't enough space.
910 */
911static int ttm_bo_mem_force_space(struct ttm_buffer_object *bo,
912 const struct ttm_place *place,
913 struct ttm_mem_reg *mem,
914 struct ttm_operation_ctx *ctx)
915{
916 struct ttm_bo_device *bdev = bo->bdev;
917 struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
918 struct ww_acquire_ctx *ticket;
919 int ret;
920
921 ticket = dma_resv_locking_ctx(bo->base.resv);
922 do {
923 ret = ttm_bo_mem_get(bo, place, mem);
924 if (likely(!ret))
925 break;
926 if (unlikely(ret != -ENOSPC))
927 return ret;
928 ret = ttm_mem_evict_first(bdev, mem->mem_type, place, ctx,
929 ticket);
930 if (unlikely(ret != 0))
931 return ret;
932 } while (1);
933
934 return ttm_bo_add_move_fence(bo, man, mem, ctx->no_wait_gpu);
935}
936
937static uint32_t ttm_bo_select_caching(struct ttm_mem_type_manager *man,
938 uint32_t cur_placement,
939 uint32_t proposed_placement)
940{
941 uint32_t caching = proposed_placement & TTM_PL_MASK_CACHING;
942 uint32_t result = proposed_placement & ~TTM_PL_MASK_CACHING;
943
944 /**
945 * Keep current caching if possible.
946 */
947
948 if ((cur_placement & caching) != 0)
949 result |= (cur_placement & caching);
950 else if ((man->default_caching & caching) != 0)
951 result |= man->default_caching;
952 else if ((TTM_PL_FLAG_CACHED & caching) != 0)
953 result |= TTM_PL_FLAG_CACHED;
954 else if ((TTM_PL_FLAG_WC & caching) != 0)
955 result |= TTM_PL_FLAG_WC;
956 else if ((TTM_PL_FLAG_UNCACHED & caching) != 0)
957 result |= TTM_PL_FLAG_UNCACHED;
958
959 return result;
960}
961
962static bool ttm_bo_mt_compatible(struct ttm_mem_type_manager *man,
963 uint32_t mem_type,
964 const struct ttm_place *place,
965 uint32_t *masked_placement)
966{
967 uint32_t cur_flags = ttm_bo_type_flags(mem_type);
968
969 if ((cur_flags & place->flags & TTM_PL_MASK_MEM) == 0)
970 return false;
971
972 if ((place->flags & man->available_caching) == 0)
973 return false;
974
975 cur_flags |= (place->flags & man->available_caching);
976
977 *masked_placement = cur_flags;
978 return true;
979}
980
981/**
982 * ttm_bo_mem_placement - check if placement is compatible
983 * @bo: BO to find memory for
984 * @place: where to search
985 * @mem: the memory object to fill in
986 * @ctx: operation context
987 *
988 * Check if placement is compatible and fill in mem structure.
989 * Returns -EBUSY if placement won't work or negative error code.
990 * 0 when placement can be used.
991 */
992static int ttm_bo_mem_placement(struct ttm_buffer_object *bo,
993 const struct ttm_place *place,
994 struct ttm_mem_reg *mem,
995 struct ttm_operation_ctx *ctx)
996{
997 struct ttm_bo_device *bdev = bo->bdev;
998 uint32_t mem_type = TTM_PL_SYSTEM;
999 struct ttm_mem_type_manager *man;
1000 uint32_t cur_flags = 0;
1001 int ret;
1002
1003 ret = ttm_mem_type_from_place(place, &mem_type);
1004 if (ret)
1005 return ret;
1006
1007 man = &bdev->man[mem_type];
1008 if (!man->has_type || !man->use_type)
1009 return -EBUSY;
1010
1011 if (!ttm_bo_mt_compatible(man, mem_type, place, &cur_flags))
1012 return -EBUSY;
1013
1014 cur_flags = ttm_bo_select_caching(man, bo->mem.placement, cur_flags);
1015 /*
1016 * Use the access and other non-mapping-related flag bits from
1017 * the memory placement flags to the current flags
1018 */
1019 ttm_flag_masked(&cur_flags, place->flags, ~TTM_PL_MASK_MEMTYPE);
1020
1021 mem->mem_type = mem_type;
1022 mem->placement = cur_flags;
1023
1024 spin_lock(&ttm_bo_glob.lru_lock);
1025 ttm_bo_del_from_lru(bo);
1026 ttm_bo_add_mem_to_lru(bo, mem);
1027 spin_unlock(&ttm_bo_glob.lru_lock);
1028
1029 return 0;
1030}
1031
1032/**
1033 * Creates space for memory region @mem according to its type.
1034 *
1035 * This function first searches for free space in compatible memory types in
1036 * the priority order defined by the driver. If free space isn't found, then
1037 * ttm_bo_mem_force_space is attempted in priority order to evict and find
1038 * space.
1039 */
1040int ttm_bo_mem_space(struct ttm_buffer_object *bo,
1041 struct ttm_placement *placement,
1042 struct ttm_mem_reg *mem,
1043 struct ttm_operation_ctx *ctx)
1044{
1045 struct ttm_bo_device *bdev = bo->bdev;
1046 bool type_found = false;
1047 int i, ret;
1048
1049 ret = dma_resv_reserve_shared(bo->base.resv, 1);
1050 if (unlikely(ret))
1051 return ret;
1052
1053 for (i = 0; i < placement->num_placement; ++i) {
1054 const struct ttm_place *place = &placement->placement[i];
1055 struct ttm_mem_type_manager *man;
1056
1057 ret = ttm_bo_mem_placement(bo, place, mem, ctx);
1058 if (ret == -EBUSY)
1059 continue;
1060 if (ret)
1061 goto error;
1062
1063 type_found = true;
1064 ret = ttm_bo_mem_get(bo, place, mem);
1065 if (ret == -ENOSPC)
1066 continue;
1067 if (unlikely(ret))
1068 goto error;
1069
1070 man = &bdev->man[mem->mem_type];
1071 ret = ttm_bo_add_move_fence(bo, man, mem, ctx->no_wait_gpu);
1072 if (unlikely(ret)) {
1073 ttm_bo_mem_put(bo, mem);
1074 if (ret == -EBUSY)
1075 continue;
1076
1077 goto error;
1078 }
1079 return 0;
1080 }
1081
1082 for (i = 0; i < placement->num_busy_placement; ++i) {
1083 const struct ttm_place *place = &placement->busy_placement[i];
1084
1085 ret = ttm_bo_mem_placement(bo, place, mem, ctx);
1086 if (ret == -EBUSY)
1087 continue;
1088 if (ret)
1089 goto error;
1090
1091 type_found = true;
1092 ret = ttm_bo_mem_force_space(bo, place, mem, ctx);
1093 if (likely(!ret))
1094 return 0;
1095
1096 if (ret && ret != -EBUSY)
1097 goto error;
1098 }
1099
1100 ret = -ENOMEM;
1101 if (!type_found) {
1102 pr_err(TTM_PFX "No compatible memory type found\n");
1103 ret = -EINVAL;
1104 }
1105
1106error:
1107 if (bo->mem.mem_type == TTM_PL_SYSTEM && !list_empty(&bo->lru)) {
1108 spin_lock(&ttm_bo_glob.lru_lock);
1109 ttm_bo_move_to_lru_tail(bo, NULL);
1110 spin_unlock(&ttm_bo_glob.lru_lock);
1111 }
1112
1113 return ret;
1114}
1115EXPORT_SYMBOL(ttm_bo_mem_space);
1116
1117static int ttm_bo_move_buffer(struct ttm_buffer_object *bo,
1118 struct ttm_placement *placement,
1119 struct ttm_operation_ctx *ctx)
1120{
1121 int ret = 0;
1122 struct ttm_mem_reg mem;
1123
1124 dma_resv_assert_held(bo->base.resv);
1125
1126 mem.num_pages = bo->num_pages;
1127 mem.size = mem.num_pages << PAGE_SHIFT;
1128 mem.page_alignment = bo->mem.page_alignment;
1129 mem.bus.io_reserved_vm = false;
1130 mem.bus.io_reserved_count = 0;
1131 mem.mm_node = NULL;
1132
1133 /*
1134 * Determine where to move the buffer.
1135 */
1136 ret = ttm_bo_mem_space(bo, placement, &mem, ctx);
1137 if (ret)
1138 goto out_unlock;
1139 ret = ttm_bo_handle_move_mem(bo, &mem, false, ctx);
1140out_unlock:
1141 if (ret)
1142 ttm_bo_mem_put(bo, &mem);
1143 return ret;
1144}
1145
1146static bool ttm_bo_places_compat(const struct ttm_place *places,
1147 unsigned num_placement,
1148 struct ttm_mem_reg *mem,
1149 uint32_t *new_flags)
1150{
1151 unsigned i;
1152
1153 for (i = 0; i < num_placement; i++) {
1154 const struct ttm_place *heap = &places[i];
1155
1156 if ((mem->start < heap->fpfn ||
1157 (heap->lpfn != 0 && (mem->start + mem->num_pages) > heap->lpfn)))
1158 continue;
1159
1160 *new_flags = heap->flags;
1161 if ((*new_flags & mem->placement & TTM_PL_MASK_CACHING) &&
1162 (*new_flags & mem->placement & TTM_PL_MASK_MEM) &&
1163 (!(*new_flags & TTM_PL_FLAG_CONTIGUOUS) ||
1164 (mem->placement & TTM_PL_FLAG_CONTIGUOUS)))
1165 return true;
1166 }
1167 return false;
1168}
1169
1170bool ttm_bo_mem_compat(struct ttm_placement *placement,
1171 struct ttm_mem_reg *mem,
1172 uint32_t *new_flags)
1173{
1174 if (ttm_bo_places_compat(placement->placement, placement->num_placement,
1175 mem, new_flags))
1176 return true;
1177
1178 if ((placement->busy_placement != placement->placement ||
1179 placement->num_busy_placement > placement->num_placement) &&
1180 ttm_bo_places_compat(placement->busy_placement,
1181 placement->num_busy_placement,
1182 mem, new_flags))
1183 return true;
1184
1185 return false;
1186}
1187EXPORT_SYMBOL(ttm_bo_mem_compat);
1188
1189int ttm_bo_validate(struct ttm_buffer_object *bo,
1190 struct ttm_placement *placement,
1191 struct ttm_operation_ctx *ctx)
1192{
1193 int ret;
1194 uint32_t new_flags;
1195
1196 dma_resv_assert_held(bo->base.resv);
1197
1198 /*
1199 * Remove the backing store if no placement is given.
1200 */
1201 if (!placement->num_placement && !placement->num_busy_placement) {
1202 ret = ttm_bo_pipeline_gutting(bo);
1203 if (ret)
1204 return ret;
1205
1206 return ttm_tt_create(bo, false);
1207 }
1208
1209 /*
1210 * Check whether we need to move buffer.
1211 */
1212 if (!ttm_bo_mem_compat(placement, &bo->mem, &new_flags)) {
1213 ret = ttm_bo_move_buffer(bo, placement, ctx);
1214 if (ret)
1215 return ret;
1216 } else {
1217 /*
1218 * Use the access and other non-mapping-related flag bits from
1219 * the compatible memory placement flags to the active flags
1220 */
1221 ttm_flag_masked(&bo->mem.placement, new_flags,
1222 ~TTM_PL_MASK_MEMTYPE);
1223 }
1224 /*
1225 * We might need to add a TTM.
1226 */
1227 if (bo->mem.mem_type == TTM_PL_SYSTEM && bo->ttm == NULL) {
1228 ret = ttm_tt_create(bo, true);
1229 if (ret)
1230 return ret;
1231 }
1232 return 0;
1233}
1234EXPORT_SYMBOL(ttm_bo_validate);
1235
1236int ttm_bo_init_reserved(struct ttm_bo_device *bdev,
1237 struct ttm_buffer_object *bo,
1238 unsigned long size,
1239 enum ttm_bo_type type,
1240 struct ttm_placement *placement,
1241 uint32_t page_alignment,
1242 struct ttm_operation_ctx *ctx,
1243 size_t acc_size,
1244 struct sg_table *sg,
1245 struct dma_resv *resv,
1246 void (*destroy) (struct ttm_buffer_object *))
1247{
1248 struct ttm_mem_global *mem_glob = &ttm_mem_glob;
1249 int ret = 0;
1250 unsigned long num_pages;
1251 bool locked;
1252
1253 ret = ttm_mem_global_alloc(mem_glob, acc_size, ctx);
1254 if (ret) {
1255 pr_err("Out of kernel memory\n");
1256 if (destroy)
1257 (*destroy)(bo);
1258 else
1259 kfree(bo);
1260 return -ENOMEM;
1261 }
1262
1263 num_pages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
1264 if (num_pages == 0) {
1265 pr_err("Illegal buffer object size\n");
1266 if (destroy)
1267 (*destroy)(bo);
1268 else
1269 kfree(bo);
1270 ttm_mem_global_free(mem_glob, acc_size);
1271 return -EINVAL;
1272 }
1273 bo->destroy = destroy ? destroy : ttm_bo_default_destroy;
1274
1275 kref_init(&bo->kref);
1276 INIT_LIST_HEAD(&bo->lru);
1277 INIT_LIST_HEAD(&bo->ddestroy);
1278 INIT_LIST_HEAD(&bo->swap);
1279 INIT_LIST_HEAD(&bo->io_reserve_lru);
1280 bo->bdev = bdev;
1281 bo->type = type;
1282 bo->num_pages = num_pages;
1283 bo->mem.size = num_pages << PAGE_SHIFT;
1284 bo->mem.mem_type = TTM_PL_SYSTEM;
1285 bo->mem.num_pages = bo->num_pages;
1286 bo->mem.mm_node = NULL;
1287 bo->mem.page_alignment = page_alignment;
1288 bo->mem.bus.io_reserved_vm = false;
1289 bo->mem.bus.io_reserved_count = 0;
1290 bo->moving = NULL;
1291 bo->mem.placement = (TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED);
1292 bo->acc_size = acc_size;
1293 bo->sg = sg;
1294 if (resv) {
1295 bo->base.resv = resv;
1296 dma_resv_assert_held(bo->base.resv);
1297 } else {
1298 bo->base.resv = &bo->base._resv;
1299 }
1300 if (!ttm_bo_uses_embedded_gem_object(bo)) {
1301 /*
1302 * bo.gem is not initialized, so we have to setup the
1303 * struct elements we want use regardless.
1304 */
1305 dma_resv_init(&bo->base._resv);
1306 drm_vma_node_reset(&bo->base.vma_node);
1307 }
1308 atomic_inc(&ttm_bo_glob.bo_count);
1309
1310 /*
1311 * For ttm_bo_type_device buffers, allocate
1312 * address space from the device.
1313 */
1314 if (bo->type == ttm_bo_type_device ||
1315 bo->type == ttm_bo_type_sg)
1316 ret = drm_vma_offset_add(bdev->vma_manager, &bo->base.vma_node,
1317 bo->mem.num_pages);
1318
1319 /* passed reservation objects should already be locked,
1320 * since otherwise lockdep will be angered in radeon.
1321 */
1322 if (!resv) {
1323 locked = dma_resv_trylock(bo->base.resv);
1324 WARN_ON(!locked);
1325 }
1326
1327 if (likely(!ret))
1328 ret = ttm_bo_validate(bo, placement, ctx);
1329
1330 if (unlikely(ret)) {
1331 if (!resv)
1332 ttm_bo_unreserve(bo);
1333
1334 ttm_bo_put(bo);
1335 return ret;
1336 }
1337
1338 spin_lock(&ttm_bo_glob.lru_lock);
1339 ttm_bo_move_to_lru_tail(bo, NULL);
1340 spin_unlock(&ttm_bo_glob.lru_lock);
1341
1342 return ret;
1343}
1344EXPORT_SYMBOL(ttm_bo_init_reserved);
1345
1346int ttm_bo_init(struct ttm_bo_device *bdev,
1347 struct ttm_buffer_object *bo,
1348 unsigned long size,
1349 enum ttm_bo_type type,
1350 struct ttm_placement *placement,
1351 uint32_t page_alignment,
1352 bool interruptible,
1353 size_t acc_size,
1354 struct sg_table *sg,
1355 struct dma_resv *resv,
1356 void (*destroy) (struct ttm_buffer_object *))
1357{
1358 struct ttm_operation_ctx ctx = { interruptible, false };
1359 int ret;
1360
1361 ret = ttm_bo_init_reserved(bdev, bo, size, type, placement,
1362 page_alignment, &ctx, acc_size,
1363 sg, resv, destroy);
1364 if (ret)
1365 return ret;
1366
1367 if (!resv)
1368 ttm_bo_unreserve(bo);
1369
1370 return 0;
1371}
1372EXPORT_SYMBOL(ttm_bo_init);
1373
1374size_t ttm_bo_acc_size(struct ttm_bo_device *bdev,
1375 unsigned long bo_size,
1376 unsigned struct_size)
1377{
1378 unsigned npages = (PAGE_ALIGN(bo_size)) >> PAGE_SHIFT;
1379 size_t size = 0;
1380
1381 size += ttm_round_pot(struct_size);
1382 size += ttm_round_pot(npages * sizeof(void *));
1383 size += ttm_round_pot(sizeof(struct ttm_tt));
1384 return size;
1385}
1386EXPORT_SYMBOL(ttm_bo_acc_size);
1387
1388size_t ttm_bo_dma_acc_size(struct ttm_bo_device *bdev,
1389 unsigned long bo_size,
1390 unsigned struct_size)
1391{
1392 unsigned npages = (PAGE_ALIGN(bo_size)) >> PAGE_SHIFT;
1393 size_t size = 0;
1394
1395 size += ttm_round_pot(struct_size);
1396 size += ttm_round_pot(npages * (2*sizeof(void *) + sizeof(dma_addr_t)));
1397 size += ttm_round_pot(sizeof(struct ttm_dma_tt));
1398 return size;
1399}
1400EXPORT_SYMBOL(ttm_bo_dma_acc_size);
1401
1402int ttm_bo_create(struct ttm_bo_device *bdev,
1403 unsigned long size,
1404 enum ttm_bo_type type,
1405 struct ttm_placement *placement,
1406 uint32_t page_alignment,
1407 bool interruptible,
1408 struct ttm_buffer_object **p_bo)
1409{
1410 struct ttm_buffer_object *bo;
1411 size_t acc_size;
1412 int ret;
1413
1414 bo = kzalloc(sizeof(*bo), GFP_KERNEL);
1415 if (unlikely(bo == NULL))
1416 return -ENOMEM;
1417
1418 acc_size = ttm_bo_acc_size(bdev, size, sizeof(struct ttm_buffer_object));
1419 ret = ttm_bo_init(bdev, bo, size, type, placement, page_alignment,
1420 interruptible, acc_size,
1421 NULL, NULL, NULL);
1422 if (likely(ret == 0))
1423 *p_bo = bo;
1424
1425 return ret;
1426}
1427EXPORT_SYMBOL(ttm_bo_create);
1428
1429static int ttm_bo_force_list_clean(struct ttm_bo_device *bdev,
1430 unsigned mem_type)
1431{
1432 struct ttm_operation_ctx ctx = {
1433 .interruptible = false,
1434 .no_wait_gpu = false,
1435 .flags = TTM_OPT_FLAG_FORCE_ALLOC
1436 };
1437 struct ttm_mem_type_manager *man = &bdev->man[mem_type];
1438 struct ttm_bo_global *glob = &ttm_bo_glob;
1439 struct dma_fence *fence;
1440 int ret;
1441 unsigned i;
1442
1443 /*
1444 * Can't use standard list traversal since we're unlocking.
1445 */
1446
1447 spin_lock(&glob->lru_lock);
1448 for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i) {
1449 while (!list_empty(&man->lru[i])) {
1450 spin_unlock(&glob->lru_lock);
1451 ret = ttm_mem_evict_first(bdev, mem_type, NULL, &ctx,
1452 NULL);
1453 if (ret)
1454 return ret;
1455 spin_lock(&glob->lru_lock);
1456 }
1457 }
1458 spin_unlock(&glob->lru_lock);
1459
1460 spin_lock(&man->move_lock);
1461 fence = dma_fence_get(man->move);
1462 spin_unlock(&man->move_lock);
1463
1464 if (fence) {
1465 ret = dma_fence_wait(fence, false);
1466 dma_fence_put(fence);
1467 if (ret)
1468 return ret;
1469 }
1470
1471 return 0;
1472}
1473
1474int ttm_bo_clean_mm(struct ttm_bo_device *bdev, unsigned mem_type)
1475{
1476 struct ttm_mem_type_manager *man;
1477 int ret = -EINVAL;
1478
1479 if (mem_type >= TTM_NUM_MEM_TYPES) {
1480 pr_err("Illegal memory type %d\n", mem_type);
1481 return ret;
1482 }
1483 man = &bdev->man[mem_type];
1484
1485 if (!man->has_type) {
1486 pr_err("Trying to take down uninitialized memory manager type %u\n",
1487 mem_type);
1488 return ret;
1489 }
1490
1491 man->use_type = false;
1492 man->has_type = false;
1493
1494 ret = 0;
1495 if (mem_type > 0) {
1496 ret = ttm_bo_force_list_clean(bdev, mem_type);
1497 if (ret) {
1498 pr_err("Cleanup eviction failed\n");
1499 return ret;
1500 }
1501
1502 ret = (*man->func->takedown)(man);
1503 }
1504
1505 dma_fence_put(man->move);
1506 man->move = NULL;
1507
1508 return ret;
1509}
1510EXPORT_SYMBOL(ttm_bo_clean_mm);
1511
1512int ttm_bo_evict_mm(struct ttm_bo_device *bdev, unsigned mem_type)
1513{
1514 struct ttm_mem_type_manager *man = &bdev->man[mem_type];
1515
1516 if (mem_type == 0 || mem_type >= TTM_NUM_MEM_TYPES) {
1517 pr_err("Illegal memory manager memory type %u\n", mem_type);
1518 return -EINVAL;
1519 }
1520
1521 if (!man->has_type) {
1522 pr_err("Memory type %u has not been initialized\n", mem_type);
1523 return 0;
1524 }
1525
1526 return ttm_bo_force_list_clean(bdev, mem_type);
1527}
1528EXPORT_SYMBOL(ttm_bo_evict_mm);
1529
1530int ttm_bo_init_mm(struct ttm_bo_device *bdev, unsigned type,
1531 unsigned long p_size)
1532{
1533 int ret;
1534 struct ttm_mem_type_manager *man;
1535 unsigned i;
1536
1537 BUG_ON(type >= TTM_NUM_MEM_TYPES);
1538 man = &bdev->man[type];
1539 BUG_ON(man->has_type);
1540 man->use_io_reserve_lru = false;
1541 mutex_init(&man->io_reserve_mutex);
1542 spin_lock_init(&man->move_lock);
1543 INIT_LIST_HEAD(&man->io_reserve_lru);
1544
1545 ret = bdev->driver->init_mem_type(bdev, type, man);
1546 if (ret)
1547 return ret;
1548 man->bdev = bdev;
1549
1550 if (type != TTM_PL_SYSTEM) {
1551 ret = (*man->func->init)(man, p_size);
1552 if (ret)
1553 return ret;
1554 }
1555 man->has_type = true;
1556 man->use_type = true;
1557 man->size = p_size;
1558
1559 for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i)
1560 INIT_LIST_HEAD(&man->lru[i]);
1561 man->move = NULL;
1562
1563 return 0;
1564}
1565EXPORT_SYMBOL(ttm_bo_init_mm);
1566
1567static void ttm_bo_global_kobj_release(struct kobject *kobj)
1568{
1569 struct ttm_bo_global *glob =
1570 container_of(kobj, struct ttm_bo_global, kobj);
1571
1572 __free_page(glob->dummy_read_page);
1573}
1574
1575static void ttm_bo_global_release(void)
1576{
1577 struct ttm_bo_global *glob = &ttm_bo_glob;
1578
1579 mutex_lock(&ttm_global_mutex);
1580 if (--ttm_bo_glob_use_count > 0)
1581 goto out;
1582
1583 kobject_del(&glob->kobj);
1584 kobject_put(&glob->kobj);
1585 ttm_mem_global_release(&ttm_mem_glob);
1586 memset(glob, 0, sizeof(*glob));
1587out:
1588 mutex_unlock(&ttm_global_mutex);
1589}
1590
1591static int ttm_bo_global_init(void)
1592{
1593 struct ttm_bo_global *glob = &ttm_bo_glob;
1594 int ret = 0;
1595 unsigned i;
1596
1597 mutex_lock(&ttm_global_mutex);
1598 if (++ttm_bo_glob_use_count > 1)
1599 goto out;
1600
1601 ret = ttm_mem_global_init(&ttm_mem_glob);
1602 if (ret)
1603 goto out;
1604
1605 spin_lock_init(&glob->lru_lock);
1606 glob->dummy_read_page = alloc_page(__GFP_ZERO | GFP_DMA32);
1607
1608 if (unlikely(glob->dummy_read_page == NULL)) {
1609 ret = -ENOMEM;
1610 goto out;
1611 }
1612
1613 for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i)
1614 INIT_LIST_HEAD(&glob->swap_lru[i]);
1615 INIT_LIST_HEAD(&glob->device_list);
1616 atomic_set(&glob->bo_count, 0);
1617
1618 ret = kobject_init_and_add(
1619 &glob->kobj, &ttm_bo_glob_kobj_type, ttm_get_kobj(), "buffer_objects");
1620 if (unlikely(ret != 0))
1621 kobject_put(&glob->kobj);
1622out:
1623 mutex_unlock(&ttm_global_mutex);
1624 return ret;
1625}
1626
1627int ttm_bo_device_release(struct ttm_bo_device *bdev)
1628{
1629 struct ttm_bo_global *glob = &ttm_bo_glob;
1630 int ret = 0;
1631 unsigned i = TTM_NUM_MEM_TYPES;
1632 struct ttm_mem_type_manager *man;
1633
1634 while (i--) {
1635 man = &bdev->man[i];
1636 if (man->has_type) {
1637 man->use_type = false;
1638 if ((i != TTM_PL_SYSTEM) && ttm_bo_clean_mm(bdev, i)) {
1639 ret = -EBUSY;
1640 pr_err("DRM memory manager type %d is not clean\n",
1641 i);
1642 }
1643 man->has_type = false;
1644 }
1645 }
1646
1647 mutex_lock(&ttm_global_mutex);
1648 list_del(&bdev->device_list);
1649 mutex_unlock(&ttm_global_mutex);
1650
1651 cancel_delayed_work_sync(&bdev->wq);
1652
1653 if (ttm_bo_delayed_delete(bdev, true))
1654 pr_debug("Delayed destroy list was clean\n");
1655
1656 spin_lock(&glob->lru_lock);
1657 for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i)
1658 if (list_empty(&bdev->man[0].lru[0]))
1659 pr_debug("Swap list %d was clean\n", i);
1660 spin_unlock(&glob->lru_lock);
1661
1662 if (!ret)
1663 ttm_bo_global_release();
1664
1665 return ret;
1666}
1667EXPORT_SYMBOL(ttm_bo_device_release);
1668
1669int ttm_bo_device_init(struct ttm_bo_device *bdev,
1670 struct ttm_bo_driver *driver,
1671 struct address_space *mapping,
1672 struct drm_vma_offset_manager *vma_manager,
1673 bool need_dma32)
1674{
1675 struct ttm_bo_global *glob = &ttm_bo_glob;
1676 int ret;
1677
1678 if (WARN_ON(vma_manager == NULL))
1679 return -EINVAL;
1680
1681 ret = ttm_bo_global_init();
1682 if (ret)
1683 return ret;
1684
1685 bdev->driver = driver;
1686
1687 memset(bdev->man, 0, sizeof(bdev->man));
1688
1689 /*
1690 * Initialize the system memory buffer type.
1691 * Other types need to be driver / IOCTL initialized.
1692 */
1693 ret = ttm_bo_init_mm(bdev, TTM_PL_SYSTEM, 0);
1694 if (unlikely(ret != 0))
1695 goto out_no_sys;
1696
1697 bdev->vma_manager = vma_manager;
1698 INIT_DELAYED_WORK(&bdev->wq, ttm_bo_delayed_workqueue);
1699 INIT_LIST_HEAD(&bdev->ddestroy);
1700 bdev->dev_mapping = mapping;
1701 bdev->need_dma32 = need_dma32;
1702 mutex_lock(&ttm_global_mutex);
1703 list_add_tail(&bdev->device_list, &glob->device_list);
1704 mutex_unlock(&ttm_global_mutex);
1705
1706 return 0;
1707out_no_sys:
1708 ttm_bo_global_release();
1709 return ret;
1710}
1711EXPORT_SYMBOL(ttm_bo_device_init);
1712
1713/*
1714 * buffer object vm functions.
1715 */
1716
1717void ttm_bo_unmap_virtual_locked(struct ttm_buffer_object *bo)
1718{
1719 struct ttm_bo_device *bdev = bo->bdev;
1720
1721 drm_vma_node_unmap(&bo->base.vma_node, bdev->dev_mapping);
1722 ttm_mem_io_free_vm(bo);
1723}
1724
1725void ttm_bo_unmap_virtual(struct ttm_buffer_object *bo)
1726{
1727 struct ttm_bo_device *bdev = bo->bdev;
1728 struct ttm_mem_type_manager *man = &bdev->man[bo->mem.mem_type];
1729
1730 ttm_mem_io_lock(man, false);
1731 ttm_bo_unmap_virtual_locked(bo);
1732 ttm_mem_io_unlock(man);
1733}
1734
1735
1736EXPORT_SYMBOL(ttm_bo_unmap_virtual);
1737
1738int ttm_bo_wait(struct ttm_buffer_object *bo,
1739 bool interruptible, bool no_wait)
1740{
1741 long timeout = 15 * HZ;
1742
1743 if (no_wait) {
1744 if (dma_resv_test_signaled_rcu(bo->base.resv, true))
1745 return 0;
1746 else
1747 return -EBUSY;
1748 }
1749
1750 timeout = dma_resv_wait_timeout_rcu(bo->base.resv, true,
1751 interruptible, timeout);
1752 if (timeout < 0)
1753 return timeout;
1754
1755 if (timeout == 0)
1756 return -EBUSY;
1757
1758 dma_resv_add_excl_fence(bo->base.resv, NULL);
1759 return 0;
1760}
1761EXPORT_SYMBOL(ttm_bo_wait);
1762
1763/**
1764 * A buffer object shrink method that tries to swap out the first
1765 * buffer object on the bo_global::swap_lru list.
1766 */
1767int ttm_bo_swapout(struct ttm_bo_global *glob, struct ttm_operation_ctx *ctx)
1768{
1769 struct ttm_buffer_object *bo;
1770 int ret = -EBUSY;
1771 bool locked;
1772 unsigned i;
1773
1774 spin_lock(&glob->lru_lock);
1775 for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i) {
1776 list_for_each_entry(bo, &glob->swap_lru[i], swap) {
1777 if (!ttm_bo_evict_swapout_allowable(bo, ctx, &locked,
1778 NULL))
1779 continue;
1780
1781 if (!ttm_bo_get_unless_zero(bo)) {
1782 if (locked)
1783 dma_resv_unlock(bo->base.resv);
1784 continue;
1785 }
1786
1787 ret = 0;
1788 break;
1789 }
1790 if (!ret)
1791 break;
1792 }
1793
1794 if (ret) {
1795 spin_unlock(&glob->lru_lock);
1796 return ret;
1797 }
1798
1799 if (bo->deleted) {
1800 ret = ttm_bo_cleanup_refs(bo, false, false, locked);
1801 ttm_bo_put(bo);
1802 return ret;
1803 }
1804
1805 ttm_bo_del_from_lru(bo);
1806 spin_unlock(&glob->lru_lock);
1807
1808 /**
1809 * Move to system cached
1810 */
1811
1812 if (bo->mem.mem_type != TTM_PL_SYSTEM ||
1813 bo->ttm->caching_state != tt_cached) {
1814 struct ttm_operation_ctx ctx = { false, false };
1815 struct ttm_mem_reg evict_mem;
1816
1817 evict_mem = bo->mem;
1818 evict_mem.mm_node = NULL;
1819 evict_mem.placement = TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED;
1820 evict_mem.mem_type = TTM_PL_SYSTEM;
1821
1822 ret = ttm_bo_handle_move_mem(bo, &evict_mem, true, &ctx);
1823 if (unlikely(ret != 0))
1824 goto out;
1825 }
1826
1827 /**
1828 * Make sure BO is idle.
1829 */
1830
1831 ret = ttm_bo_wait(bo, false, false);
1832 if (unlikely(ret != 0))
1833 goto out;
1834
1835 ttm_bo_unmap_virtual(bo);
1836
1837 /**
1838 * Swap out. Buffer will be swapped in again as soon as
1839 * anyone tries to access a ttm page.
1840 */
1841
1842 if (bo->bdev->driver->swap_notify)
1843 bo->bdev->driver->swap_notify(bo);
1844
1845 ret = ttm_tt_swapout(bo->ttm, bo->persistent_swap_storage);
1846out:
1847
1848 /**
1849 *
1850 * Unreserve without putting on LRU to avoid swapping out an
1851 * already swapped buffer.
1852 */
1853 if (locked)
1854 dma_resv_unlock(bo->base.resv);
1855 ttm_bo_put(bo);
1856 return ret;
1857}
1858EXPORT_SYMBOL(ttm_bo_swapout);
1859
1860void ttm_bo_swapout_all(void)
1861{
1862 struct ttm_operation_ctx ctx = {
1863 .interruptible = false,
1864 .no_wait_gpu = false
1865 };
1866
1867 while (ttm_bo_swapout(&ttm_bo_glob, &ctx) == 0);
1868}
1869EXPORT_SYMBOL(ttm_bo_swapout_all);