1 /**************************************************************************
3 * Copyright (c) 2006-2009 VMware, Inc., Palo Alto, CA., USA
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:
14 * The above copyright notice and this permission notice (including the
15 * next paragraph) shall be included in all copies or substantial portions
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.
26 **************************************************************************/
28 * Authors: Thomas Hellstrom <thellstrom-at-vmware-dot-com>
31 #define pr_fmt(fmt) "[TTM] " fmt
33 #include <drm/ttm/ttm_module.h>
34 #include <drm/ttm/ttm_bo_driver.h>
35 #include <drm/ttm/ttm_placement.h>
36 #include <linux/jiffies.h>
37 #include <linux/slab.h>
38 #include <linux/sched.h>
40 #include <linux/file.h>
41 #include <linux/module.h>
42 #include <linux/atomic.h>
43 #include <linux/reservation.h>
45 #define TTM_ASSERT_LOCKED(param)
46 #define TTM_DEBUG(fmt, arg...)
47 #define TTM_BO_HASH_ORDER 13
49 static int ttm_bo_swapout(struct ttm_mem_shrink
*shrink
);
50 static void ttm_bo_global_kobj_release(struct kobject
*kobj
);
52 static struct attribute ttm_bo_count
= {
57 static inline int ttm_mem_type_from_place(const struct ttm_place
*place
,
62 for (i
= 0; i
<= TTM_PL_PRIV5
; i
++)
63 if (place
->flags
& (1 << i
)) {
70 static void ttm_mem_type_debug(struct ttm_bo_device
*bdev
, int mem_type
)
72 struct ttm_mem_type_manager
*man
= &bdev
->man
[mem_type
];
74 pr_err(" has_type: %d\n", man
->has_type
);
75 pr_err(" use_type: %d\n", man
->use_type
);
76 pr_err(" flags: 0x%08X\n", man
->flags
);
77 pr_err(" gpu_offset: 0x%08llX\n", man
->gpu_offset
);
78 pr_err(" size: %llu\n", man
->size
);
79 pr_err(" available_caching: 0x%08X\n", man
->available_caching
);
80 pr_err(" default_caching: 0x%08X\n", man
->default_caching
);
81 if (mem_type
!= TTM_PL_SYSTEM
)
82 (*man
->func
->debug
)(man
, TTM_PFX
);
85 static void ttm_bo_mem_space_debug(struct ttm_buffer_object
*bo
,
86 struct ttm_placement
*placement
)
90 pr_err("No space for %p (%lu pages, %luK, %luM)\n",
91 bo
, bo
->mem
.num_pages
, bo
->mem
.size
>> 10,
93 for (i
= 0; i
< placement
->num_placement
; i
++) {
94 ret
= ttm_mem_type_from_place(&placement
->placement
[i
],
98 pr_err(" placement[%d]=0x%08X (%d)\n",
99 i
, placement
->placement
[i
].flags
, mem_type
);
100 ttm_mem_type_debug(bo
->bdev
, mem_type
);
104 static ssize_t
ttm_bo_global_show(struct kobject
*kobj
,
105 struct attribute
*attr
,
108 struct ttm_bo_global
*glob
=
109 container_of(kobj
, struct ttm_bo_global
, kobj
);
111 return snprintf(buffer
, PAGE_SIZE
, "%lu\n",
112 (unsigned long) atomic_read(&glob
->bo_count
));
115 static struct attribute
*ttm_bo_global_attrs
[] = {
120 static const struct sysfs_ops ttm_bo_global_ops
= {
121 .show
= &ttm_bo_global_show
124 static struct kobj_type ttm_bo_glob_kobj_type
= {
125 .release
= &ttm_bo_global_kobj_release
,
126 .sysfs_ops
= &ttm_bo_global_ops
,
127 .default_attrs
= ttm_bo_global_attrs
131 static inline uint32_t ttm_bo_type_flags(unsigned type
)
136 static void ttm_bo_release_list(struct kref
*list_kref
)
138 struct ttm_buffer_object
*bo
=
139 container_of(list_kref
, struct ttm_buffer_object
, list_kref
);
140 struct ttm_bo_device
*bdev
= bo
->bdev
;
141 size_t acc_size
= bo
->acc_size
;
143 BUG_ON(atomic_read(&bo
->list_kref
.refcount
));
144 BUG_ON(atomic_read(&bo
->kref
.refcount
));
145 BUG_ON(atomic_read(&bo
->cpu_writers
));
146 BUG_ON(bo
->mem
.mm_node
!= NULL
);
147 BUG_ON(!list_empty(&bo
->lru
));
148 BUG_ON(!list_empty(&bo
->ddestroy
));
151 ttm_tt_destroy(bo
->ttm
);
152 atomic_dec(&bo
->glob
->bo_count
);
153 if (bo
->resv
== &bo
->ttm_resv
)
154 reservation_object_fini(&bo
->ttm_resv
);
155 mutex_destroy(&bo
->wu_mutex
);
161 ttm_mem_global_free(bdev
->glob
->mem_glob
, acc_size
);
164 void ttm_bo_add_to_lru(struct ttm_buffer_object
*bo
)
166 struct ttm_bo_device
*bdev
= bo
->bdev
;
167 struct ttm_mem_type_manager
*man
;
169 lockdep_assert_held(&bo
->resv
->lock
.base
);
171 if (!(bo
->mem
.placement
& TTM_PL_FLAG_NO_EVICT
)) {
173 BUG_ON(!list_empty(&bo
->lru
));
175 man
= &bdev
->man
[bo
->mem
.mem_type
];
176 list_add_tail(&bo
->lru
, &man
->lru
);
177 kref_get(&bo
->list_kref
);
179 if (bo
->ttm
!= NULL
) {
180 list_add_tail(&bo
->swap
, &bo
->glob
->swap_lru
);
181 kref_get(&bo
->list_kref
);
185 EXPORT_SYMBOL(ttm_bo_add_to_lru
);
187 int ttm_bo_del_from_lru(struct ttm_buffer_object
*bo
)
191 if (!list_empty(&bo
->swap
)) {
192 list_del_init(&bo
->swap
);
195 if (!list_empty(&bo
->lru
)) {
196 list_del_init(&bo
->lru
);
201 * TODO: Add a driver hook to delete from
202 * driver-specific LRU's here.
208 static void ttm_bo_ref_bug(struct kref
*list_kref
)
213 void ttm_bo_list_ref_sub(struct ttm_buffer_object
*bo
, int count
,
216 kref_sub(&bo
->list_kref
, count
,
217 (never_free
) ? ttm_bo_ref_bug
: ttm_bo_release_list
);
220 void ttm_bo_del_sub_from_lru(struct ttm_buffer_object
*bo
)
224 spin_lock(&bo
->glob
->lru_lock
);
225 put_count
= ttm_bo_del_from_lru(bo
);
226 spin_unlock(&bo
->glob
->lru_lock
);
227 ttm_bo_list_ref_sub(bo
, put_count
, true);
229 EXPORT_SYMBOL(ttm_bo_del_sub_from_lru
);
232 * Call bo->mutex locked.
234 static int ttm_bo_add_ttm(struct ttm_buffer_object
*bo
, bool zero_alloc
)
236 struct ttm_bo_device
*bdev
= bo
->bdev
;
237 struct ttm_bo_global
*glob
= bo
->glob
;
239 uint32_t page_flags
= 0;
241 TTM_ASSERT_LOCKED(&bo
->mutex
);
244 if (bdev
->need_dma32
)
245 page_flags
|= TTM_PAGE_FLAG_DMA32
;
248 case ttm_bo_type_device
:
250 page_flags
|= TTM_PAGE_FLAG_ZERO_ALLOC
;
251 case ttm_bo_type_kernel
:
252 bo
->ttm
= bdev
->driver
->ttm_tt_create(bdev
, bo
->num_pages
<< PAGE_SHIFT
,
253 page_flags
, glob
->dummy_read_page
);
254 if (unlikely(bo
->ttm
== NULL
))
258 bo
->ttm
= bdev
->driver
->ttm_tt_create(bdev
, bo
->num_pages
<< PAGE_SHIFT
,
259 page_flags
| TTM_PAGE_FLAG_SG
,
260 glob
->dummy_read_page
);
261 if (unlikely(bo
->ttm
== NULL
)) {
265 bo
->ttm
->sg
= bo
->sg
;
268 pr_err("Illegal buffer object type\n");
276 static int ttm_bo_handle_move_mem(struct ttm_buffer_object
*bo
,
277 struct ttm_mem_reg
*mem
,
278 bool evict
, bool interruptible
,
281 struct ttm_bo_device
*bdev
= bo
->bdev
;
282 bool old_is_pci
= ttm_mem_reg_is_pci(bdev
, &bo
->mem
);
283 bool new_is_pci
= ttm_mem_reg_is_pci(bdev
, mem
);
284 struct ttm_mem_type_manager
*old_man
= &bdev
->man
[bo
->mem
.mem_type
];
285 struct ttm_mem_type_manager
*new_man
= &bdev
->man
[mem
->mem_type
];
288 if (old_is_pci
|| new_is_pci
||
289 ((mem
->placement
& bo
->mem
.placement
& TTM_PL_MASK_CACHING
) == 0)) {
290 ret
= ttm_mem_io_lock(old_man
, true);
291 if (unlikely(ret
!= 0))
293 ttm_bo_unmap_virtual_locked(bo
);
294 ttm_mem_io_unlock(old_man
);
298 * Create and bind a ttm if required.
301 if (!(new_man
->flags
& TTM_MEMTYPE_FLAG_FIXED
)) {
302 if (bo
->ttm
== NULL
) {
303 bool zero
= !(old_man
->flags
& TTM_MEMTYPE_FLAG_FIXED
);
304 ret
= ttm_bo_add_ttm(bo
, zero
);
309 ret
= ttm_tt_set_placement_caching(bo
->ttm
, mem
->placement
);
313 if (mem
->mem_type
!= TTM_PL_SYSTEM
) {
314 ret
= ttm_tt_bind(bo
->ttm
, mem
);
319 if (bo
->mem
.mem_type
== TTM_PL_SYSTEM
) {
320 if (bdev
->driver
->move_notify
)
321 bdev
->driver
->move_notify(bo
, mem
);
328 if (bdev
->driver
->move_notify
)
329 bdev
->driver
->move_notify(bo
, mem
);
331 if (!(old_man
->flags
& TTM_MEMTYPE_FLAG_FIXED
) &&
332 !(new_man
->flags
& TTM_MEMTYPE_FLAG_FIXED
))
333 ret
= ttm_bo_move_ttm(bo
, evict
, no_wait_gpu
, mem
);
334 else if (bdev
->driver
->move
)
335 ret
= bdev
->driver
->move(bo
, evict
, interruptible
,
338 ret
= ttm_bo_move_memcpy(bo
, evict
, no_wait_gpu
, mem
);
341 if (bdev
->driver
->move_notify
) {
342 struct ttm_mem_reg tmp_mem
= *mem
;
345 bdev
->driver
->move_notify(bo
, mem
);
355 if (bdev
->driver
->invalidate_caches
) {
356 ret
= bdev
->driver
->invalidate_caches(bdev
, bo
->mem
.placement
);
358 pr_err("Can not flush read caches\n");
363 if (bo
->mem
.mm_node
) {
364 bo
->offset
= (bo
->mem
.start
<< PAGE_SHIFT
) +
365 bdev
->man
[bo
->mem
.mem_type
].gpu_offset
;
366 bo
->cur_placement
= bo
->mem
.placement
;
373 new_man
= &bdev
->man
[bo
->mem
.mem_type
];
374 if ((new_man
->flags
& TTM_MEMTYPE_FLAG_FIXED
) && bo
->ttm
) {
375 ttm_tt_unbind(bo
->ttm
);
376 ttm_tt_destroy(bo
->ttm
);
385 * Will release GPU memory type usage on destruction.
386 * This is the place to put in driver specific hooks to release
387 * driver private resources.
388 * Will release the bo::reserved lock.
391 static void ttm_bo_cleanup_memtype_use(struct ttm_buffer_object
*bo
)
393 if (bo
->bdev
->driver
->move_notify
)
394 bo
->bdev
->driver
->move_notify(bo
, NULL
);
397 ttm_tt_unbind(bo
->ttm
);
398 ttm_tt_destroy(bo
->ttm
);
401 ttm_bo_mem_put(bo
, &bo
->mem
);
403 ww_mutex_unlock (&bo
->resv
->lock
);
406 static void ttm_bo_flush_all_fences(struct ttm_buffer_object
*bo
)
408 struct reservation_object_list
*fobj
;
412 fobj
= reservation_object_get_list(bo
->resv
);
413 fence
= reservation_object_get_excl(bo
->resv
);
414 if (fence
&& !fence
->ops
->signaled
)
415 fence_enable_sw_signaling(fence
);
417 for (i
= 0; fobj
&& i
< fobj
->shared_count
; ++i
) {
418 fence
= rcu_dereference_protected(fobj
->shared
[i
],
419 reservation_object_held(bo
->resv
));
421 if (!fence
->ops
->signaled
)
422 fence_enable_sw_signaling(fence
);
426 static void ttm_bo_cleanup_refs_or_queue(struct ttm_buffer_object
*bo
)
428 struct ttm_bo_device
*bdev
= bo
->bdev
;
429 struct ttm_bo_global
*glob
= bo
->glob
;
433 spin_lock(&glob
->lru_lock
);
434 ret
= __ttm_bo_reserve(bo
, false, true, false, NULL
);
437 if (!ttm_bo_wait(bo
, false, false, true)) {
438 put_count
= ttm_bo_del_from_lru(bo
);
440 spin_unlock(&glob
->lru_lock
);
441 ttm_bo_cleanup_memtype_use(bo
);
443 ttm_bo_list_ref_sub(bo
, put_count
, true);
447 ttm_bo_flush_all_fences(bo
);
450 * Make NO_EVICT bos immediately available to
451 * shrinkers, now that they are queued for
454 if (bo
->mem
.placement
& TTM_PL_FLAG_NO_EVICT
) {
455 bo
->mem
.placement
&= ~TTM_PL_FLAG_NO_EVICT
;
456 ttm_bo_add_to_lru(bo
);
459 __ttm_bo_unreserve(bo
);
462 kref_get(&bo
->list_kref
);
463 list_add_tail(&bo
->ddestroy
, &bdev
->ddestroy
);
464 spin_unlock(&glob
->lru_lock
);
466 schedule_delayed_work(&bdev
->wq
,
467 ((HZ
/ 100) < 1) ? 1 : HZ
/ 100);
471 * function ttm_bo_cleanup_refs_and_unlock
472 * If bo idle, remove from delayed- and lru lists, and unref.
473 * If not idle, do nothing.
475 * Must be called with lru_lock and reservation held, this function
476 * will drop both before returning.
478 * @interruptible Any sleeps should occur interruptibly.
479 * @no_wait_gpu Never wait for gpu. Return -EBUSY instead.
482 static int ttm_bo_cleanup_refs_and_unlock(struct ttm_buffer_object
*bo
,
486 struct ttm_bo_global
*glob
= bo
->glob
;
490 ret
= ttm_bo_wait(bo
, false, false, true);
492 if (ret
&& !no_wait_gpu
) {
494 ww_mutex_unlock(&bo
->resv
->lock
);
495 spin_unlock(&glob
->lru_lock
);
497 lret
= reservation_object_wait_timeout_rcu(bo
->resv
,
507 spin_lock(&glob
->lru_lock
);
508 ret
= __ttm_bo_reserve(bo
, false, true, false, NULL
);
511 * We raced, and lost, someone else holds the reservation now,
512 * and is probably busy in ttm_bo_cleanup_memtype_use.
514 * Even if it's not the case, because we finished waiting any
515 * delayed destruction would succeed, so just return success
519 spin_unlock(&glob
->lru_lock
);
524 * remove sync_obj with ttm_bo_wait, the wait should be
525 * finished, and no new wait object should have been added.
527 ret
= ttm_bo_wait(bo
, false, false, true);
531 if (ret
|| unlikely(list_empty(&bo
->ddestroy
))) {
532 __ttm_bo_unreserve(bo
);
533 spin_unlock(&glob
->lru_lock
);
537 put_count
= ttm_bo_del_from_lru(bo
);
538 list_del_init(&bo
->ddestroy
);
541 spin_unlock(&glob
->lru_lock
);
542 ttm_bo_cleanup_memtype_use(bo
);
544 ttm_bo_list_ref_sub(bo
, put_count
, true);
550 * Traverse the delayed list, and call ttm_bo_cleanup_refs on all
551 * encountered buffers.
554 static int ttm_bo_delayed_delete(struct ttm_bo_device
*bdev
, bool remove_all
)
556 struct ttm_bo_global
*glob
= bdev
->glob
;
557 struct ttm_buffer_object
*entry
= NULL
;
560 spin_lock(&glob
->lru_lock
);
561 if (list_empty(&bdev
->ddestroy
))
564 entry
= list_first_entry(&bdev
->ddestroy
,
565 struct ttm_buffer_object
, ddestroy
);
566 kref_get(&entry
->list_kref
);
569 struct ttm_buffer_object
*nentry
= NULL
;
571 if (entry
->ddestroy
.next
!= &bdev
->ddestroy
) {
572 nentry
= list_first_entry(&entry
->ddestroy
,
573 struct ttm_buffer_object
, ddestroy
);
574 kref_get(&nentry
->list_kref
);
577 ret
= __ttm_bo_reserve(entry
, false, true, false, NULL
);
578 if (remove_all
&& ret
) {
579 spin_unlock(&glob
->lru_lock
);
580 ret
= __ttm_bo_reserve(entry
, false, false,
582 spin_lock(&glob
->lru_lock
);
586 ret
= ttm_bo_cleanup_refs_and_unlock(entry
, false,
589 spin_unlock(&glob
->lru_lock
);
591 kref_put(&entry
->list_kref
, ttm_bo_release_list
);
597 spin_lock(&glob
->lru_lock
);
598 if (list_empty(&entry
->ddestroy
))
603 spin_unlock(&glob
->lru_lock
);
606 kref_put(&entry
->list_kref
, ttm_bo_release_list
);
610 static void ttm_bo_delayed_workqueue(struct work_struct
*work
)
612 struct ttm_bo_device
*bdev
=
613 container_of(work
, struct ttm_bo_device
, wq
.work
);
615 if (ttm_bo_delayed_delete(bdev
, false)) {
616 schedule_delayed_work(&bdev
->wq
,
617 ((HZ
/ 100) < 1) ? 1 : HZ
/ 100);
621 static void ttm_bo_release(struct kref
*kref
)
623 struct ttm_buffer_object
*bo
=
624 container_of(kref
, struct ttm_buffer_object
, kref
);
625 struct ttm_bo_device
*bdev
= bo
->bdev
;
626 struct ttm_mem_type_manager
*man
= &bdev
->man
[bo
->mem
.mem_type
];
628 drm_vma_offset_remove(&bdev
->vma_manager
, &bo
->vma_node
);
629 ttm_mem_io_lock(man
, false);
630 ttm_mem_io_free_vm(bo
);
631 ttm_mem_io_unlock(man
);
632 ttm_bo_cleanup_refs_or_queue(bo
);
633 kref_put(&bo
->list_kref
, ttm_bo_release_list
);
636 void ttm_bo_unref(struct ttm_buffer_object
**p_bo
)
638 struct ttm_buffer_object
*bo
= *p_bo
;
641 kref_put(&bo
->kref
, ttm_bo_release
);
643 EXPORT_SYMBOL(ttm_bo_unref
);
645 int ttm_bo_lock_delayed_workqueue(struct ttm_bo_device
*bdev
)
647 return cancel_delayed_work_sync(&bdev
->wq
);
649 EXPORT_SYMBOL(ttm_bo_lock_delayed_workqueue
);
651 void ttm_bo_unlock_delayed_workqueue(struct ttm_bo_device
*bdev
, int resched
)
654 schedule_delayed_work(&bdev
->wq
,
655 ((HZ
/ 100) < 1) ? 1 : HZ
/ 100);
657 EXPORT_SYMBOL(ttm_bo_unlock_delayed_workqueue
);
659 static int ttm_bo_evict(struct ttm_buffer_object
*bo
, bool interruptible
,
662 struct ttm_bo_device
*bdev
= bo
->bdev
;
663 struct ttm_mem_reg evict_mem
;
664 struct ttm_placement placement
;
667 ret
= ttm_bo_wait(bo
, false, interruptible
, no_wait_gpu
);
669 if (unlikely(ret
!= 0)) {
670 if (ret
!= -ERESTARTSYS
) {
671 pr_err("Failed to expire sync object before buffer eviction\n");
676 lockdep_assert_held(&bo
->resv
->lock
.base
);
679 evict_mem
.mm_node
= NULL
;
680 evict_mem
.bus
.io_reserved_vm
= false;
681 evict_mem
.bus
.io_reserved_count
= 0;
683 placement
.num_placement
= 0;
684 placement
.num_busy_placement
= 0;
685 bdev
->driver
->evict_flags(bo
, &placement
);
686 ret
= ttm_bo_mem_space(bo
, &placement
, &evict_mem
, interruptible
,
689 if (ret
!= -ERESTARTSYS
) {
690 pr_err("Failed to find memory space for buffer 0x%p eviction\n",
692 ttm_bo_mem_space_debug(bo
, &placement
);
697 ret
= ttm_bo_handle_move_mem(bo
, &evict_mem
, true, interruptible
,
700 if (ret
!= -ERESTARTSYS
)
701 pr_err("Buffer eviction failed\n");
702 ttm_bo_mem_put(bo
, &evict_mem
);
710 static int ttm_mem_evict_first(struct ttm_bo_device
*bdev
,
712 const struct ttm_place
*place
,
716 struct ttm_bo_global
*glob
= bdev
->glob
;
717 struct ttm_mem_type_manager
*man
= &bdev
->man
[mem_type
];
718 struct ttm_buffer_object
*bo
;
719 int ret
= -EBUSY
, put_count
;
721 spin_lock(&glob
->lru_lock
);
722 list_for_each_entry(bo
, &man
->lru
, lru
) {
723 ret
= __ttm_bo_reserve(bo
, false, true, false, NULL
);
725 if (place
&& (place
->fpfn
|| place
->lpfn
)) {
726 /* Don't evict this BO if it's outside of the
727 * requested placement range
729 if (place
->fpfn
>= (bo
->mem
.start
+ bo
->mem
.size
) ||
730 (place
->lpfn
&& place
->lpfn
<= bo
->mem
.start
)) {
731 __ttm_bo_unreserve(bo
);
742 spin_unlock(&glob
->lru_lock
);
746 kref_get(&bo
->list_kref
);
748 if (!list_empty(&bo
->ddestroy
)) {
749 ret
= ttm_bo_cleanup_refs_and_unlock(bo
, interruptible
,
751 kref_put(&bo
->list_kref
, ttm_bo_release_list
);
755 put_count
= ttm_bo_del_from_lru(bo
);
756 spin_unlock(&glob
->lru_lock
);
760 ttm_bo_list_ref_sub(bo
, put_count
, true);
762 ret
= ttm_bo_evict(bo
, interruptible
, no_wait_gpu
);
763 ttm_bo_unreserve(bo
);
765 kref_put(&bo
->list_kref
, ttm_bo_release_list
);
769 void ttm_bo_mem_put(struct ttm_buffer_object
*bo
, struct ttm_mem_reg
*mem
)
771 struct ttm_mem_type_manager
*man
= &bo
->bdev
->man
[mem
->mem_type
];
774 (*man
->func
->put_node
)(man
, mem
);
776 EXPORT_SYMBOL(ttm_bo_mem_put
);
779 * Repeatedly evict memory from the LRU for @mem_type until we create enough
780 * space, or we've evicted everything and there isn't enough space.
782 static int ttm_bo_mem_force_space(struct ttm_buffer_object
*bo
,
784 const struct ttm_place
*place
,
785 struct ttm_mem_reg
*mem
,
789 struct ttm_bo_device
*bdev
= bo
->bdev
;
790 struct ttm_mem_type_manager
*man
= &bdev
->man
[mem_type
];
794 ret
= (*man
->func
->get_node
)(man
, bo
, place
, mem
);
795 if (unlikely(ret
!= 0))
799 ret
= ttm_mem_evict_first(bdev
, mem_type
, place
,
800 interruptible
, no_wait_gpu
);
801 if (unlikely(ret
!= 0))
804 if (mem
->mm_node
== NULL
)
806 mem
->mem_type
= mem_type
;
810 static uint32_t ttm_bo_select_caching(struct ttm_mem_type_manager
*man
,
811 uint32_t cur_placement
,
812 uint32_t proposed_placement
)
814 uint32_t caching
= proposed_placement
& TTM_PL_MASK_CACHING
;
815 uint32_t result
= proposed_placement
& ~TTM_PL_MASK_CACHING
;
818 * Keep current caching if possible.
821 if ((cur_placement
& caching
) != 0)
822 result
|= (cur_placement
& caching
);
823 else if ((man
->default_caching
& caching
) != 0)
824 result
|= man
->default_caching
;
825 else if ((TTM_PL_FLAG_CACHED
& caching
) != 0)
826 result
|= TTM_PL_FLAG_CACHED
;
827 else if ((TTM_PL_FLAG_WC
& caching
) != 0)
828 result
|= TTM_PL_FLAG_WC
;
829 else if ((TTM_PL_FLAG_UNCACHED
& caching
) != 0)
830 result
|= TTM_PL_FLAG_UNCACHED
;
835 static bool ttm_bo_mt_compatible(struct ttm_mem_type_manager
*man
,
837 const struct ttm_place
*place
,
838 uint32_t *masked_placement
)
840 uint32_t cur_flags
= ttm_bo_type_flags(mem_type
);
842 if ((cur_flags
& place
->flags
& TTM_PL_MASK_MEM
) == 0)
845 if ((place
->flags
& man
->available_caching
) == 0)
848 cur_flags
|= (place
->flags
& man
->available_caching
);
850 *masked_placement
= cur_flags
;
855 * Creates space for memory region @mem according to its type.
857 * This function first searches for free space in compatible memory types in
858 * the priority order defined by the driver. If free space isn't found, then
859 * ttm_bo_mem_force_space is attempted in priority order to evict and find
862 int ttm_bo_mem_space(struct ttm_buffer_object
*bo
,
863 struct ttm_placement
*placement
,
864 struct ttm_mem_reg
*mem
,
868 struct ttm_bo_device
*bdev
= bo
->bdev
;
869 struct ttm_mem_type_manager
*man
;
870 uint32_t mem_type
= TTM_PL_SYSTEM
;
871 uint32_t cur_flags
= 0;
872 bool type_found
= false;
873 bool type_ok
= false;
874 bool has_erestartsys
= false;
878 for (i
= 0; i
< placement
->num_placement
; ++i
) {
879 const struct ttm_place
*place
= &placement
->placement
[i
];
881 ret
= ttm_mem_type_from_place(place
, &mem_type
);
884 man
= &bdev
->man
[mem_type
];
886 type_ok
= ttm_bo_mt_compatible(man
, mem_type
, place
,
892 cur_flags
= ttm_bo_select_caching(man
, bo
->mem
.placement
,
895 * Use the access and other non-mapping-related flag bits from
896 * the memory placement flags to the current flags
898 ttm_flag_masked(&cur_flags
, place
->flags
,
899 ~TTM_PL_MASK_MEMTYPE
);
901 if (mem_type
== TTM_PL_SYSTEM
)
904 if (man
->has_type
&& man
->use_type
) {
906 ret
= (*man
->func
->get_node
)(man
, bo
, place
, mem
);
914 if ((type_ok
&& (mem_type
== TTM_PL_SYSTEM
)) || mem
->mm_node
) {
915 mem
->mem_type
= mem_type
;
916 mem
->placement
= cur_flags
;
923 for (i
= 0; i
< placement
->num_busy_placement
; ++i
) {
924 const struct ttm_place
*place
= &placement
->busy_placement
[i
];
926 ret
= ttm_mem_type_from_place(place
, &mem_type
);
929 man
= &bdev
->man
[mem_type
];
932 if (!ttm_bo_mt_compatible(man
, mem_type
, place
, &cur_flags
))
935 cur_flags
= ttm_bo_select_caching(man
, bo
->mem
.placement
,
938 * Use the access and other non-mapping-related flag bits from
939 * the memory placement flags to the current flags
941 ttm_flag_masked(&cur_flags
, place
->flags
,
942 ~TTM_PL_MASK_MEMTYPE
);
944 if (mem_type
== TTM_PL_SYSTEM
) {
945 mem
->mem_type
= mem_type
;
946 mem
->placement
= cur_flags
;
951 ret
= ttm_bo_mem_force_space(bo
, mem_type
, place
, mem
,
952 interruptible
, no_wait_gpu
);
953 if (ret
== 0 && mem
->mm_node
) {
954 mem
->placement
= cur_flags
;
957 if (ret
== -ERESTARTSYS
)
958 has_erestartsys
= true;
960 ret
= (has_erestartsys
) ? -ERESTARTSYS
: -ENOMEM
;
963 EXPORT_SYMBOL(ttm_bo_mem_space
);
965 static int ttm_bo_move_buffer(struct ttm_buffer_object
*bo
,
966 struct ttm_placement
*placement
,
971 struct ttm_mem_reg mem
;
973 lockdep_assert_held(&bo
->resv
->lock
.base
);
976 * FIXME: It's possible to pipeline buffer moves.
977 * Have the driver move function wait for idle when necessary,
978 * instead of doing it here.
980 ret
= ttm_bo_wait(bo
, false, interruptible
, no_wait_gpu
);
983 mem
.num_pages
= bo
->num_pages
;
984 mem
.size
= mem
.num_pages
<< PAGE_SHIFT
;
985 mem
.page_alignment
= bo
->mem
.page_alignment
;
986 mem
.bus
.io_reserved_vm
= false;
987 mem
.bus
.io_reserved_count
= 0;
989 * Determine where to move the buffer.
991 ret
= ttm_bo_mem_space(bo
, placement
, &mem
,
992 interruptible
, no_wait_gpu
);
995 ret
= ttm_bo_handle_move_mem(bo
, &mem
, false,
996 interruptible
, no_wait_gpu
);
998 if (ret
&& mem
.mm_node
)
999 ttm_bo_mem_put(bo
, &mem
);
1003 static bool ttm_bo_mem_compat(struct ttm_placement
*placement
,
1004 struct ttm_mem_reg
*mem
,
1005 uint32_t *new_flags
)
1009 for (i
= 0; i
< placement
->num_placement
; i
++) {
1010 const struct ttm_place
*heap
= &placement
->placement
[i
];
1012 (mem
->start
< heap
->fpfn
||
1013 (heap
->lpfn
!= 0 && (mem
->start
+ mem
->num_pages
) > heap
->lpfn
)))
1016 *new_flags
= heap
->flags
;
1017 if ((*new_flags
& mem
->placement
& TTM_PL_MASK_CACHING
) &&
1018 (*new_flags
& mem
->placement
& TTM_PL_MASK_MEM
))
1022 for (i
= 0; i
< placement
->num_busy_placement
; i
++) {
1023 const struct ttm_place
*heap
= &placement
->busy_placement
[i
];
1025 (mem
->start
< heap
->fpfn
||
1026 (heap
->lpfn
!= 0 && (mem
->start
+ mem
->num_pages
) > heap
->lpfn
)))
1029 *new_flags
= heap
->flags
;
1030 if ((*new_flags
& mem
->placement
& TTM_PL_MASK_CACHING
) &&
1031 (*new_flags
& mem
->placement
& TTM_PL_MASK_MEM
))
1038 int ttm_bo_validate(struct ttm_buffer_object
*bo
,
1039 struct ttm_placement
*placement
,
1046 lockdep_assert_held(&bo
->resv
->lock
.base
);
1048 * Check whether we need to move buffer.
1050 if (!ttm_bo_mem_compat(placement
, &bo
->mem
, &new_flags
)) {
1051 ret
= ttm_bo_move_buffer(bo
, placement
, interruptible
,
1057 * Use the access and other non-mapping-related flag bits from
1058 * the compatible memory placement flags to the active flags
1060 ttm_flag_masked(&bo
->mem
.placement
, new_flags
,
1061 ~TTM_PL_MASK_MEMTYPE
);
1064 * We might need to add a TTM.
1066 if (bo
->mem
.mem_type
== TTM_PL_SYSTEM
&& bo
->ttm
== NULL
) {
1067 ret
= ttm_bo_add_ttm(bo
, true);
1073 EXPORT_SYMBOL(ttm_bo_validate
);
1075 int ttm_bo_init(struct ttm_bo_device
*bdev
,
1076 struct ttm_buffer_object
*bo
,
1078 enum ttm_bo_type type
,
1079 struct ttm_placement
*placement
,
1080 uint32_t page_alignment
,
1082 struct file
*persistent_swap_storage
,
1084 struct sg_table
*sg
,
1085 struct reservation_object
*resv
,
1086 void (*destroy
) (struct ttm_buffer_object
*))
1089 unsigned long num_pages
;
1090 struct ttm_mem_global
*mem_glob
= bdev
->glob
->mem_glob
;
1093 ret
= ttm_mem_global_alloc(mem_glob
, acc_size
, false, false);
1095 pr_err("Out of kernel memory\n");
1103 num_pages
= (size
+ PAGE_SIZE
- 1) >> PAGE_SHIFT
;
1104 if (num_pages
== 0) {
1105 pr_err("Illegal buffer object size\n");
1110 ttm_mem_global_free(mem_glob
, acc_size
);
1113 bo
->destroy
= destroy
;
1115 kref_init(&bo
->kref
);
1116 kref_init(&bo
->list_kref
);
1117 atomic_set(&bo
->cpu_writers
, 0);
1118 INIT_LIST_HEAD(&bo
->lru
);
1119 INIT_LIST_HEAD(&bo
->ddestroy
);
1120 INIT_LIST_HEAD(&bo
->swap
);
1121 INIT_LIST_HEAD(&bo
->io_reserve_lru
);
1122 mutex_init(&bo
->wu_mutex
);
1124 bo
->glob
= bdev
->glob
;
1126 bo
->num_pages
= num_pages
;
1127 bo
->mem
.size
= num_pages
<< PAGE_SHIFT
;
1128 bo
->mem
.mem_type
= TTM_PL_SYSTEM
;
1129 bo
->mem
.num_pages
= bo
->num_pages
;
1130 bo
->mem
.mm_node
= NULL
;
1131 bo
->mem
.page_alignment
= page_alignment
;
1132 bo
->mem
.bus
.io_reserved_vm
= false;
1133 bo
->mem
.bus
.io_reserved_count
= 0;
1135 bo
->mem
.placement
= (TTM_PL_FLAG_SYSTEM
| TTM_PL_FLAG_CACHED
);
1136 bo
->persistent_swap_storage
= persistent_swap_storage
;
1137 bo
->acc_size
= acc_size
;
1141 lockdep_assert_held(&bo
->resv
->lock
.base
);
1143 bo
->resv
= &bo
->ttm_resv
;
1144 reservation_object_init(&bo
->ttm_resv
);
1146 atomic_inc(&bo
->glob
->bo_count
);
1147 drm_vma_node_reset(&bo
->vma_node
);
1150 * For ttm_bo_type_device buffers, allocate
1151 * address space from the device.
1153 if (bo
->type
== ttm_bo_type_device
||
1154 bo
->type
== ttm_bo_type_sg
)
1155 ret
= drm_vma_offset_add(&bdev
->vma_manager
, &bo
->vma_node
,
1158 /* passed reservation objects should already be locked,
1159 * since otherwise lockdep will be angered in radeon.
1162 locked
= ww_mutex_trylock(&bo
->resv
->lock
);
1167 ret
= ttm_bo_validate(bo
, placement
, interruptible
, false);
1170 ttm_bo_unreserve(bo
);
1177 EXPORT_SYMBOL(ttm_bo_init
);
1179 size_t ttm_bo_acc_size(struct ttm_bo_device
*bdev
,
1180 unsigned long bo_size
,
1181 unsigned struct_size
)
1183 unsigned npages
= (PAGE_ALIGN(bo_size
)) >> PAGE_SHIFT
;
1186 size
+= ttm_round_pot(struct_size
);
1187 size
+= PAGE_ALIGN(npages
* sizeof(void *));
1188 size
+= ttm_round_pot(sizeof(struct ttm_tt
));
1191 EXPORT_SYMBOL(ttm_bo_acc_size
);
1193 size_t ttm_bo_dma_acc_size(struct ttm_bo_device
*bdev
,
1194 unsigned long bo_size
,
1195 unsigned struct_size
)
1197 unsigned npages
= (PAGE_ALIGN(bo_size
)) >> PAGE_SHIFT
;
1200 size
+= ttm_round_pot(struct_size
);
1201 size
+= PAGE_ALIGN(npages
* sizeof(void *));
1202 size
+= PAGE_ALIGN(npages
* sizeof(dma_addr_t
));
1203 size
+= ttm_round_pot(sizeof(struct ttm_dma_tt
));
1206 EXPORT_SYMBOL(ttm_bo_dma_acc_size
);
1208 int ttm_bo_create(struct ttm_bo_device
*bdev
,
1210 enum ttm_bo_type type
,
1211 struct ttm_placement
*placement
,
1212 uint32_t page_alignment
,
1214 struct file
*persistent_swap_storage
,
1215 struct ttm_buffer_object
**p_bo
)
1217 struct ttm_buffer_object
*bo
;
1221 bo
= kzalloc(sizeof(*bo
), GFP_KERNEL
);
1222 if (unlikely(bo
== NULL
))
1225 acc_size
= ttm_bo_acc_size(bdev
, size
, sizeof(struct ttm_buffer_object
));
1226 ret
= ttm_bo_init(bdev
, bo
, size
, type
, placement
, page_alignment
,
1227 interruptible
, persistent_swap_storage
, acc_size
,
1229 if (likely(ret
== 0))
1234 EXPORT_SYMBOL(ttm_bo_create
);
1236 static int ttm_bo_force_list_clean(struct ttm_bo_device
*bdev
,
1237 unsigned mem_type
, bool allow_errors
)
1239 struct ttm_mem_type_manager
*man
= &bdev
->man
[mem_type
];
1240 struct ttm_bo_global
*glob
= bdev
->glob
;
1244 * Can't use standard list traversal since we're unlocking.
1247 spin_lock(&glob
->lru_lock
);
1248 while (!list_empty(&man
->lru
)) {
1249 spin_unlock(&glob
->lru_lock
);
1250 ret
= ttm_mem_evict_first(bdev
, mem_type
, NULL
, false, false);
1255 pr_err("Cleanup eviction failed\n");
1258 spin_lock(&glob
->lru_lock
);
1260 spin_unlock(&glob
->lru_lock
);
1264 int ttm_bo_clean_mm(struct ttm_bo_device
*bdev
, unsigned mem_type
)
1266 struct ttm_mem_type_manager
*man
;
1269 if (mem_type
>= TTM_NUM_MEM_TYPES
) {
1270 pr_err("Illegal memory type %d\n", mem_type
);
1273 man
= &bdev
->man
[mem_type
];
1275 if (!man
->has_type
) {
1276 pr_err("Trying to take down uninitialized memory manager type %u\n",
1281 man
->use_type
= false;
1282 man
->has_type
= false;
1286 ttm_bo_force_list_clean(bdev
, mem_type
, false);
1288 ret
= (*man
->func
->takedown
)(man
);
1293 EXPORT_SYMBOL(ttm_bo_clean_mm
);
1295 int ttm_bo_evict_mm(struct ttm_bo_device
*bdev
, unsigned mem_type
)
1297 struct ttm_mem_type_manager
*man
= &bdev
->man
[mem_type
];
1299 if (mem_type
== 0 || mem_type
>= TTM_NUM_MEM_TYPES
) {
1300 pr_err("Illegal memory manager memory type %u\n", mem_type
);
1304 if (!man
->has_type
) {
1305 pr_err("Memory type %u has not been initialized\n", mem_type
);
1309 return ttm_bo_force_list_clean(bdev
, mem_type
, true);
1311 EXPORT_SYMBOL(ttm_bo_evict_mm
);
1313 int ttm_bo_init_mm(struct ttm_bo_device
*bdev
, unsigned type
,
1314 unsigned long p_size
)
1317 struct ttm_mem_type_manager
*man
;
1319 BUG_ON(type
>= TTM_NUM_MEM_TYPES
);
1320 man
= &bdev
->man
[type
];
1321 BUG_ON(man
->has_type
);
1322 man
->io_reserve_fastpath
= true;
1323 man
->use_io_reserve_lru
= false;
1324 mutex_init(&man
->io_reserve_mutex
);
1325 INIT_LIST_HEAD(&man
->io_reserve_lru
);
1327 ret
= bdev
->driver
->init_mem_type(bdev
, type
, man
);
1333 if (type
!= TTM_PL_SYSTEM
) {
1334 ret
= (*man
->func
->init
)(man
, p_size
);
1338 man
->has_type
= true;
1339 man
->use_type
= true;
1342 INIT_LIST_HEAD(&man
->lru
);
1346 EXPORT_SYMBOL(ttm_bo_init_mm
);
1348 static void ttm_bo_global_kobj_release(struct kobject
*kobj
)
1350 struct ttm_bo_global
*glob
=
1351 container_of(kobj
, struct ttm_bo_global
, kobj
);
1353 ttm_mem_unregister_shrink(glob
->mem_glob
, &glob
->shrink
);
1354 __free_page(glob
->dummy_read_page
);
1358 void ttm_bo_global_release(struct drm_global_reference
*ref
)
1360 struct ttm_bo_global
*glob
= ref
->object
;
1362 kobject_del(&glob
->kobj
);
1363 kobject_put(&glob
->kobj
);
1365 EXPORT_SYMBOL(ttm_bo_global_release
);
1367 int ttm_bo_global_init(struct drm_global_reference
*ref
)
1369 struct ttm_bo_global_ref
*bo_ref
=
1370 container_of(ref
, struct ttm_bo_global_ref
, ref
);
1371 struct ttm_bo_global
*glob
= ref
->object
;
1374 mutex_init(&glob
->device_list_mutex
);
1375 spin_lock_init(&glob
->lru_lock
);
1376 glob
->mem_glob
= bo_ref
->mem_glob
;
1377 glob
->dummy_read_page
= alloc_page(__GFP_ZERO
| GFP_DMA32
);
1379 if (unlikely(glob
->dummy_read_page
== NULL
)) {
1384 INIT_LIST_HEAD(&glob
->swap_lru
);
1385 INIT_LIST_HEAD(&glob
->device_list
);
1387 ttm_mem_init_shrink(&glob
->shrink
, ttm_bo_swapout
);
1388 ret
= ttm_mem_register_shrink(glob
->mem_glob
, &glob
->shrink
);
1389 if (unlikely(ret
!= 0)) {
1390 pr_err("Could not register buffer object swapout\n");
1394 atomic_set(&glob
->bo_count
, 0);
1396 ret
= kobject_init_and_add(
1397 &glob
->kobj
, &ttm_bo_glob_kobj_type
, ttm_get_kobj(), "buffer_objects");
1398 if (unlikely(ret
!= 0))
1399 kobject_put(&glob
->kobj
);
1402 __free_page(glob
->dummy_read_page
);
1407 EXPORT_SYMBOL(ttm_bo_global_init
);
1410 int ttm_bo_device_release(struct ttm_bo_device
*bdev
)
1413 unsigned i
= TTM_NUM_MEM_TYPES
;
1414 struct ttm_mem_type_manager
*man
;
1415 struct ttm_bo_global
*glob
= bdev
->glob
;
1418 man
= &bdev
->man
[i
];
1419 if (man
->has_type
) {
1420 man
->use_type
= false;
1421 if ((i
!= TTM_PL_SYSTEM
) && ttm_bo_clean_mm(bdev
, i
)) {
1423 pr_err("DRM memory manager type %d is not clean\n",
1426 man
->has_type
= false;
1430 mutex_lock(&glob
->device_list_mutex
);
1431 list_del(&bdev
->device_list
);
1432 mutex_unlock(&glob
->device_list_mutex
);
1434 cancel_delayed_work_sync(&bdev
->wq
);
1436 while (ttm_bo_delayed_delete(bdev
, true))
1439 spin_lock(&glob
->lru_lock
);
1440 if (list_empty(&bdev
->ddestroy
))
1441 TTM_DEBUG("Delayed destroy list was clean\n");
1443 if (list_empty(&bdev
->man
[0].lru
))
1444 TTM_DEBUG("Swap list was clean\n");
1445 spin_unlock(&glob
->lru_lock
);
1447 drm_vma_offset_manager_destroy(&bdev
->vma_manager
);
1451 EXPORT_SYMBOL(ttm_bo_device_release
);
1453 int ttm_bo_device_init(struct ttm_bo_device
*bdev
,
1454 struct ttm_bo_global
*glob
,
1455 struct ttm_bo_driver
*driver
,
1456 struct address_space
*mapping
,
1457 uint64_t file_page_offset
,
1462 bdev
->driver
= driver
;
1464 memset(bdev
->man
, 0, sizeof(bdev
->man
));
1467 * Initialize the system memory buffer type.
1468 * Other types need to be driver / IOCTL initialized.
1470 ret
= ttm_bo_init_mm(bdev
, TTM_PL_SYSTEM
, 0);
1471 if (unlikely(ret
!= 0))
1474 drm_vma_offset_manager_init(&bdev
->vma_manager
, file_page_offset
,
1476 INIT_DELAYED_WORK(&bdev
->wq
, ttm_bo_delayed_workqueue
);
1477 INIT_LIST_HEAD(&bdev
->ddestroy
);
1478 bdev
->dev_mapping
= mapping
;
1480 bdev
->need_dma32
= need_dma32
;
1482 mutex_lock(&glob
->device_list_mutex
);
1483 list_add_tail(&bdev
->device_list
, &glob
->device_list
);
1484 mutex_unlock(&glob
->device_list_mutex
);
1490 EXPORT_SYMBOL(ttm_bo_device_init
);
1493 * buffer object vm functions.
1496 bool ttm_mem_reg_is_pci(struct ttm_bo_device
*bdev
, struct ttm_mem_reg
*mem
)
1498 struct ttm_mem_type_manager
*man
= &bdev
->man
[mem
->mem_type
];
1500 if (!(man
->flags
& TTM_MEMTYPE_FLAG_FIXED
)) {
1501 if (mem
->mem_type
== TTM_PL_SYSTEM
)
1504 if (man
->flags
& TTM_MEMTYPE_FLAG_CMA
)
1507 if (mem
->placement
& TTM_PL_FLAG_CACHED
)
1513 void ttm_bo_unmap_virtual_locked(struct ttm_buffer_object
*bo
)
1515 struct ttm_bo_device
*bdev
= bo
->bdev
;
1517 drm_vma_node_unmap(&bo
->vma_node
, bdev
->dev_mapping
);
1518 ttm_mem_io_free_vm(bo
);
1521 void ttm_bo_unmap_virtual(struct ttm_buffer_object
*bo
)
1523 struct ttm_bo_device
*bdev
= bo
->bdev
;
1524 struct ttm_mem_type_manager
*man
= &bdev
->man
[bo
->mem
.mem_type
];
1526 ttm_mem_io_lock(man
, false);
1527 ttm_bo_unmap_virtual_locked(bo
);
1528 ttm_mem_io_unlock(man
);
1532 EXPORT_SYMBOL(ttm_bo_unmap_virtual
);
1534 int ttm_bo_wait(struct ttm_buffer_object
*bo
,
1535 bool lazy
, bool interruptible
, bool no_wait
)
1537 struct reservation_object_list
*fobj
;
1538 struct reservation_object
*resv
;
1540 long timeout
= 15 * HZ
;
1544 fobj
= reservation_object_get_list(resv
);
1545 excl
= reservation_object_get_excl(resv
);
1547 if (!fence_is_signaled(excl
)) {
1551 timeout
= fence_wait_timeout(excl
,
1552 interruptible
, timeout
);
1556 for (i
= 0; fobj
&& timeout
> 0 && i
< fobj
->shared_count
; ++i
) {
1557 struct fence
*fence
;
1558 fence
= rcu_dereference_protected(fobj
->shared
[i
],
1559 reservation_object_held(resv
));
1561 if (!fence_is_signaled(fence
)) {
1565 timeout
= fence_wait_timeout(fence
,
1566 interruptible
, timeout
);
1576 reservation_object_add_excl_fence(resv
, NULL
);
1577 clear_bit(TTM_BO_PRIV_FLAG_MOVING
, &bo
->priv_flags
);
1580 EXPORT_SYMBOL(ttm_bo_wait
);
1582 int ttm_bo_synccpu_write_grab(struct ttm_buffer_object
*bo
, bool no_wait
)
1587 * Using ttm_bo_reserve makes sure the lru lists are updated.
1590 ret
= ttm_bo_reserve(bo
, true, no_wait
, false, NULL
);
1591 if (unlikely(ret
!= 0))
1593 ret
= ttm_bo_wait(bo
, false, true, no_wait
);
1594 if (likely(ret
== 0))
1595 atomic_inc(&bo
->cpu_writers
);
1596 ttm_bo_unreserve(bo
);
1599 EXPORT_SYMBOL(ttm_bo_synccpu_write_grab
);
1601 void ttm_bo_synccpu_write_release(struct ttm_buffer_object
*bo
)
1603 atomic_dec(&bo
->cpu_writers
);
1605 EXPORT_SYMBOL(ttm_bo_synccpu_write_release
);
1608 * A buffer object shrink method that tries to swap out the first
1609 * buffer object on the bo_global::swap_lru list.
1612 static int ttm_bo_swapout(struct ttm_mem_shrink
*shrink
)
1614 struct ttm_bo_global
*glob
=
1615 container_of(shrink
, struct ttm_bo_global
, shrink
);
1616 struct ttm_buffer_object
*bo
;
1619 uint32_t swap_placement
= (TTM_PL_FLAG_CACHED
| TTM_PL_FLAG_SYSTEM
);
1621 spin_lock(&glob
->lru_lock
);
1622 list_for_each_entry(bo
, &glob
->swap_lru
, swap
) {
1623 ret
= __ttm_bo_reserve(bo
, false, true, false, NULL
);
1629 spin_unlock(&glob
->lru_lock
);
1633 kref_get(&bo
->list_kref
);
1635 if (!list_empty(&bo
->ddestroy
)) {
1636 ret
= ttm_bo_cleanup_refs_and_unlock(bo
, false, false);
1637 kref_put(&bo
->list_kref
, ttm_bo_release_list
);
1641 put_count
= ttm_bo_del_from_lru(bo
);
1642 spin_unlock(&glob
->lru_lock
);
1644 ttm_bo_list_ref_sub(bo
, put_count
, true);
1647 * Wait for GPU, then move to system cached.
1650 ret
= ttm_bo_wait(bo
, false, false, false);
1652 if (unlikely(ret
!= 0))
1655 if ((bo
->mem
.placement
& swap_placement
) != swap_placement
) {
1656 struct ttm_mem_reg evict_mem
;
1658 evict_mem
= bo
->mem
;
1659 evict_mem
.mm_node
= NULL
;
1660 evict_mem
.placement
= TTM_PL_FLAG_SYSTEM
| TTM_PL_FLAG_CACHED
;
1661 evict_mem
.mem_type
= TTM_PL_SYSTEM
;
1663 ret
= ttm_bo_handle_move_mem(bo
, &evict_mem
, true,
1665 if (unlikely(ret
!= 0))
1669 ttm_bo_unmap_virtual(bo
);
1672 * Swap out. Buffer will be swapped in again as soon as
1673 * anyone tries to access a ttm page.
1676 if (bo
->bdev
->driver
->swap_notify
)
1677 bo
->bdev
->driver
->swap_notify(bo
);
1679 ret
= ttm_tt_swapout(bo
->ttm
, bo
->persistent_swap_storage
);
1684 * Unreserve without putting on LRU to avoid swapping out an
1685 * already swapped buffer.
1688 __ttm_bo_unreserve(bo
);
1689 kref_put(&bo
->list_kref
, ttm_bo_release_list
);
1693 void ttm_bo_swapout_all(struct ttm_bo_device
*bdev
)
1695 while (ttm_bo_swapout(&bdev
->glob
->shrink
) == 0)
1698 EXPORT_SYMBOL(ttm_bo_swapout_all
);
1701 * ttm_bo_wait_unreserved - interruptible wait for a buffer object to become
1704 * @bo: Pointer to buffer
1706 int ttm_bo_wait_unreserved(struct ttm_buffer_object
*bo
)
1711 * In the absense of a wait_unlocked API,
1712 * Use the bo::wu_mutex to avoid triggering livelocks due to
1713 * concurrent use of this function. Note that this use of
1714 * bo::wu_mutex can go away if we change locking order to
1715 * mmap_sem -> bo::reserve.
1717 ret
= mutex_lock_interruptible(&bo
->wu_mutex
);
1718 if (unlikely(ret
!= 0))
1719 return -ERESTARTSYS
;
1720 if (!ww_mutex_is_locked(&bo
->resv
->lock
))
1722 ret
= __ttm_bo_reserve(bo
, true, false, false, NULL
);
1723 if (unlikely(ret
!= 0))
1725 __ttm_bo_unreserve(bo
);
1728 mutex_unlock(&bo
->wu_mutex
);