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>
44 #define TTM_ASSERT_LOCKED(param)
45 #define TTM_DEBUG(fmt, arg...)
46 #define TTM_BO_HASH_ORDER 13
48 static int ttm_bo_swapout(struct ttm_mem_shrink *shrink);
49 static void ttm_bo_global_kobj_release(struct kobject *kobj);
51 static struct attribute ttm_bo_count = {
56 static inline int ttm_mem_type_from_flags(uint32_t flags, uint32_t *mem_type)
60 for (i = 0; i <= TTM_PL_PRIV5; i++)
61 if (flags & (1 << i)) {
68 static void ttm_mem_type_debug(struct ttm_bo_device *bdev, int mem_type)
70 struct ttm_mem_type_manager *man = &bdev->man[mem_type];
72 pr_err(" has_type: %d\n", man->has_type);
73 pr_err(" use_type: %d\n", man->use_type);
74 pr_err(" flags: 0x%08X\n", man->flags);
75 pr_err(" gpu_offset: 0x%08lX\n", man->gpu_offset);
76 pr_err(" size: %llu\n", man->size);
77 pr_err(" available_caching: 0x%08X\n", man->available_caching);
78 pr_err(" default_caching: 0x%08X\n", man->default_caching);
79 if (mem_type != TTM_PL_SYSTEM)
80 (*man->func->debug)(man, TTM_PFX);
83 static void ttm_bo_mem_space_debug(struct ttm_buffer_object *bo,
84 struct ttm_placement *placement)
88 pr_err("No space for %p (%lu pages, %luK, %luM)\n",
89 bo, bo->mem.num_pages, bo->mem.size >> 10,
91 for (i = 0; i < placement->num_placement; i++) {
92 ret = ttm_mem_type_from_flags(placement->placement[i],
96 pr_err(" placement[%d]=0x%08X (%d)\n",
97 i, placement->placement[i], mem_type);
98 ttm_mem_type_debug(bo->bdev, mem_type);
102 static ssize_t ttm_bo_global_show(struct kobject *kobj,
103 struct attribute *attr,
106 struct ttm_bo_global *glob =
107 container_of(kobj, struct ttm_bo_global, kobj);
109 return snprintf(buffer, PAGE_SIZE, "%lu\n",
110 (unsigned long) atomic_read(&glob->bo_count));
113 static struct attribute *ttm_bo_global_attrs[] = {
118 static const struct sysfs_ops ttm_bo_global_ops = {
119 .show = &ttm_bo_global_show
122 static struct kobj_type ttm_bo_glob_kobj_type = {
123 .release = &ttm_bo_global_kobj_release,
124 .sysfs_ops = &ttm_bo_global_ops,
125 .default_attrs = ttm_bo_global_attrs
129 static inline uint32_t ttm_bo_type_flags(unsigned type)
134 static void ttm_bo_release_list(struct kref *list_kref)
136 struct ttm_buffer_object *bo =
137 container_of(list_kref, struct ttm_buffer_object, list_kref);
138 struct ttm_bo_device *bdev = bo->bdev;
139 size_t acc_size = bo->acc_size;
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));
150 ttm_tt_destroy(bo->ttm);
151 atomic_dec(&bo->glob->bo_count);
152 if (bo->resv == &bo->ttm_resv)
153 reservation_object_fini(&bo->ttm_resv);
154 mutex_destroy(&bo->wu_mutex);
160 ttm_mem_global_free(bdev->glob->mem_glob, acc_size);
163 void ttm_bo_add_to_lru(struct ttm_buffer_object *bo)
165 struct ttm_bo_device *bdev = bo->bdev;
166 struct ttm_mem_type_manager *man;
168 lockdep_assert_held(&bo->resv->lock.base);
170 if (!(bo->mem.placement & TTM_PL_FLAG_NO_EVICT)) {
172 BUG_ON(!list_empty(&bo->lru));
174 man = &bdev->man[bo->mem.mem_type];
175 list_add_tail(&bo->lru, &man->lru);
176 kref_get(&bo->list_kref);
178 if (bo->ttm != NULL) {
179 list_add_tail(&bo->swap, &bo->glob->swap_lru);
180 kref_get(&bo->list_kref);
184 EXPORT_SYMBOL(ttm_bo_add_to_lru);
186 int ttm_bo_del_from_lru(struct ttm_buffer_object *bo)
190 if (!list_empty(&bo->swap)) {
191 list_del_init(&bo->swap);
194 if (!list_empty(&bo->lru)) {
195 list_del_init(&bo->lru);
200 * TODO: Add a driver hook to delete from
201 * driver-specific LRU's here.
207 static void ttm_bo_ref_bug(struct kref *list_kref)
212 void ttm_bo_list_ref_sub(struct ttm_buffer_object *bo, int count,
215 kref_sub(&bo->list_kref, count,
216 (never_free) ? ttm_bo_ref_bug : ttm_bo_release_list);
219 void ttm_bo_del_sub_from_lru(struct ttm_buffer_object *bo)
223 spin_lock(&bo->glob->lru_lock);
224 put_count = ttm_bo_del_from_lru(bo);
225 spin_unlock(&bo->glob->lru_lock);
226 ttm_bo_list_ref_sub(bo, put_count, true);
228 EXPORT_SYMBOL(ttm_bo_del_sub_from_lru);
231 * Call bo->mutex locked.
233 static int ttm_bo_add_ttm(struct ttm_buffer_object *bo, bool zero_alloc)
235 struct ttm_bo_device *bdev = bo->bdev;
236 struct ttm_bo_global *glob = bo->glob;
238 uint32_t page_flags = 0;
240 TTM_ASSERT_LOCKED(&bo->mutex);
243 if (bdev->need_dma32)
244 page_flags |= TTM_PAGE_FLAG_DMA32;
247 case ttm_bo_type_device:
249 page_flags |= TTM_PAGE_FLAG_ZERO_ALLOC;
250 case ttm_bo_type_kernel:
251 bo->ttm = bdev->driver->ttm_tt_create(bdev, bo->num_pages << PAGE_SHIFT,
252 page_flags, glob->dummy_read_page);
253 if (unlikely(bo->ttm == NULL))
257 bo->ttm = bdev->driver->ttm_tt_create(bdev, bo->num_pages << PAGE_SHIFT,
258 page_flags | TTM_PAGE_FLAG_SG,
259 glob->dummy_read_page);
260 if (unlikely(bo->ttm == NULL)) {
264 bo->ttm->sg = bo->sg;
267 pr_err("Illegal buffer object type\n");
275 static int ttm_bo_handle_move_mem(struct ttm_buffer_object *bo,
276 struct ttm_mem_reg *mem,
277 bool evict, bool interruptible,
280 struct ttm_bo_device *bdev = bo->bdev;
281 bool old_is_pci = ttm_mem_reg_is_pci(bdev, &bo->mem);
282 bool new_is_pci = ttm_mem_reg_is_pci(bdev, mem);
283 struct ttm_mem_type_manager *old_man = &bdev->man[bo->mem.mem_type];
284 struct ttm_mem_type_manager *new_man = &bdev->man[mem->mem_type];
287 if (old_is_pci || new_is_pci ||
288 ((mem->placement & bo->mem.placement & TTM_PL_MASK_CACHING) == 0)) {
289 ret = ttm_mem_io_lock(old_man, true);
290 if (unlikely(ret != 0))
292 ttm_bo_unmap_virtual_locked(bo);
293 ttm_mem_io_unlock(old_man);
297 * Create and bind a ttm if required.
300 if (!(new_man->flags & TTM_MEMTYPE_FLAG_FIXED)) {
301 if (bo->ttm == NULL) {
302 bool zero = !(old_man->flags & TTM_MEMTYPE_FLAG_FIXED);
303 ret = ttm_bo_add_ttm(bo, zero);
308 ret = ttm_tt_set_placement_caching(bo->ttm, mem->placement);
312 if (mem->mem_type != TTM_PL_SYSTEM) {
313 ret = ttm_tt_bind(bo->ttm, mem);
318 if (bo->mem.mem_type == TTM_PL_SYSTEM) {
319 if (bdev->driver->move_notify)
320 bdev->driver->move_notify(bo, mem);
327 if (bdev->driver->move_notify)
328 bdev->driver->move_notify(bo, mem);
330 if (!(old_man->flags & TTM_MEMTYPE_FLAG_FIXED) &&
331 !(new_man->flags & TTM_MEMTYPE_FLAG_FIXED))
332 ret = ttm_bo_move_ttm(bo, evict, no_wait_gpu, mem);
333 else if (bdev->driver->move)
334 ret = bdev->driver->move(bo, evict, interruptible,
337 ret = ttm_bo_move_memcpy(bo, evict, no_wait_gpu, mem);
340 if (bdev->driver->move_notify) {
341 struct ttm_mem_reg tmp_mem = *mem;
344 bdev->driver->move_notify(bo, mem);
354 if (bdev->driver->invalidate_caches) {
355 ret = bdev->driver->invalidate_caches(bdev, bo->mem.placement);
357 pr_err("Can not flush read caches\n");
362 if (bo->mem.mm_node) {
363 bo->offset = (bo->mem.start << PAGE_SHIFT) +
364 bdev->man[bo->mem.mem_type].gpu_offset;
365 bo->cur_placement = bo->mem.placement;
372 new_man = &bdev->man[bo->mem.mem_type];
373 if ((new_man->flags & TTM_MEMTYPE_FLAG_FIXED) && bo->ttm) {
374 ttm_tt_unbind(bo->ttm);
375 ttm_tt_destroy(bo->ttm);
384 * Will release GPU memory type usage on destruction.
385 * This is the place to put in driver specific hooks to release
386 * driver private resources.
387 * Will release the bo::reserved lock.
390 static void ttm_bo_cleanup_memtype_use(struct ttm_buffer_object *bo)
392 if (bo->bdev->driver->move_notify)
393 bo->bdev->driver->move_notify(bo, NULL);
396 ttm_tt_unbind(bo->ttm);
397 ttm_tt_destroy(bo->ttm);
400 ttm_bo_mem_put(bo, &bo->mem);
402 ww_mutex_unlock (&bo->resv->lock);
405 static void ttm_bo_cleanup_refs_or_queue(struct ttm_buffer_object *bo)
407 struct ttm_bo_device *bdev = bo->bdev;
408 struct ttm_bo_global *glob = bo->glob;
409 struct ttm_bo_driver *driver = bdev->driver;
410 void *sync_obj = NULL;
414 spin_lock(&glob->lru_lock);
415 ret = ttm_bo_reserve_nolru(bo, false, true, false, 0);
417 spin_lock(&bdev->fence_lock);
418 (void) ttm_bo_wait(bo, false, false, true);
419 if (!ret && !bo->sync_obj) {
420 spin_unlock(&bdev->fence_lock);
421 put_count = ttm_bo_del_from_lru(bo);
423 spin_unlock(&glob->lru_lock);
424 ttm_bo_cleanup_memtype_use(bo);
426 ttm_bo_list_ref_sub(bo, put_count, true);
431 sync_obj = driver->sync_obj_ref(bo->sync_obj);
432 spin_unlock(&bdev->fence_lock);
437 * Make NO_EVICT bos immediately available to
438 * shrinkers, now that they are queued for
441 if (bo->mem.placement & TTM_PL_FLAG_NO_EVICT) {
442 bo->mem.placement &= ~TTM_PL_FLAG_NO_EVICT;
443 ttm_bo_add_to_lru(bo);
446 ww_mutex_unlock(&bo->resv->lock);
449 kref_get(&bo->list_kref);
450 list_add_tail(&bo->ddestroy, &bdev->ddestroy);
451 spin_unlock(&glob->lru_lock);
454 driver->sync_obj_flush(sync_obj);
455 driver->sync_obj_unref(&sync_obj);
457 schedule_delayed_work(&bdev->wq,
458 ((HZ / 100) < 1) ? 1 : HZ / 100);
462 * function ttm_bo_cleanup_refs_and_unlock
463 * If bo idle, remove from delayed- and lru lists, and unref.
464 * If not idle, do nothing.
466 * Must be called with lru_lock and reservation held, this function
467 * will drop both before returning.
469 * @interruptible Any sleeps should occur interruptibly.
470 * @no_wait_gpu Never wait for gpu. Return -EBUSY instead.
473 static int ttm_bo_cleanup_refs_and_unlock(struct ttm_buffer_object *bo,
477 struct ttm_bo_device *bdev = bo->bdev;
478 struct ttm_bo_driver *driver = bdev->driver;
479 struct ttm_bo_global *glob = bo->glob;
483 spin_lock(&bdev->fence_lock);
484 ret = ttm_bo_wait(bo, false, false, true);
486 if (ret && !no_wait_gpu) {
490 * Take a reference to the fence and unreserve,
491 * at this point the buffer should be dead, so
492 * no new sync objects can be attached.
494 sync_obj = driver->sync_obj_ref(bo->sync_obj);
495 spin_unlock(&bdev->fence_lock);
497 ww_mutex_unlock(&bo->resv->lock);
498 spin_unlock(&glob->lru_lock);
500 ret = driver->sync_obj_wait(sync_obj, false, interruptible);
501 driver->sync_obj_unref(&sync_obj);
506 * remove sync_obj with ttm_bo_wait, the wait should be
507 * finished, and no new wait object should have been added.
509 spin_lock(&bdev->fence_lock);
510 ret = ttm_bo_wait(bo, false, false, true);
512 spin_unlock(&bdev->fence_lock);
516 spin_lock(&glob->lru_lock);
517 ret = ttm_bo_reserve_nolru(bo, false, true, false, 0);
520 * We raced, and lost, someone else holds the reservation now,
521 * and is probably busy in ttm_bo_cleanup_memtype_use.
523 * Even if it's not the case, because we finished waiting any
524 * delayed destruction would succeed, so just return success
528 spin_unlock(&glob->lru_lock);
532 spin_unlock(&bdev->fence_lock);
534 if (ret || unlikely(list_empty(&bo->ddestroy))) {
535 ww_mutex_unlock(&bo->resv->lock);
536 spin_unlock(&glob->lru_lock);
540 put_count = ttm_bo_del_from_lru(bo);
541 list_del_init(&bo->ddestroy);
544 spin_unlock(&glob->lru_lock);
545 ttm_bo_cleanup_memtype_use(bo);
547 ttm_bo_list_ref_sub(bo, put_count, true);
553 * Traverse the delayed list, and call ttm_bo_cleanup_refs on all
554 * encountered buffers.
557 static int ttm_bo_delayed_delete(struct ttm_bo_device *bdev, bool remove_all)
559 struct ttm_bo_global *glob = bdev->glob;
560 struct ttm_buffer_object *entry = NULL;
563 spin_lock(&glob->lru_lock);
564 if (list_empty(&bdev->ddestroy))
567 entry = list_first_entry(&bdev->ddestroy,
568 struct ttm_buffer_object, ddestroy);
569 kref_get(&entry->list_kref);
572 struct ttm_buffer_object *nentry = NULL;
574 if (entry->ddestroy.next != &bdev->ddestroy) {
575 nentry = list_first_entry(&entry->ddestroy,
576 struct ttm_buffer_object, ddestroy);
577 kref_get(&nentry->list_kref);
580 ret = ttm_bo_reserve_nolru(entry, false, true, false, 0);
581 if (remove_all && ret) {
582 spin_unlock(&glob->lru_lock);
583 ret = ttm_bo_reserve_nolru(entry, false, false,
585 spin_lock(&glob->lru_lock);
589 ret = ttm_bo_cleanup_refs_and_unlock(entry, false,
592 spin_unlock(&glob->lru_lock);
594 kref_put(&entry->list_kref, ttm_bo_release_list);
600 spin_lock(&glob->lru_lock);
601 if (list_empty(&entry->ddestroy))
606 spin_unlock(&glob->lru_lock);
609 kref_put(&entry->list_kref, ttm_bo_release_list);
613 static void ttm_bo_delayed_workqueue(struct work_struct *work)
615 struct ttm_bo_device *bdev =
616 container_of(work, struct ttm_bo_device, wq.work);
618 if (ttm_bo_delayed_delete(bdev, false)) {
619 schedule_delayed_work(&bdev->wq,
620 ((HZ / 100) < 1) ? 1 : HZ / 100);
624 static void ttm_bo_release(struct kref *kref)
626 struct ttm_buffer_object *bo =
627 container_of(kref, struct ttm_buffer_object, kref);
628 struct ttm_bo_device *bdev = bo->bdev;
629 struct ttm_mem_type_manager *man = &bdev->man[bo->mem.mem_type];
631 drm_vma_offset_remove(&bdev->vma_manager, &bo->vma_node);
632 ttm_mem_io_lock(man, false);
633 ttm_mem_io_free_vm(bo);
634 ttm_mem_io_unlock(man);
635 ttm_bo_cleanup_refs_or_queue(bo);
636 kref_put(&bo->list_kref, ttm_bo_release_list);
639 void ttm_bo_unref(struct ttm_buffer_object **p_bo)
641 struct ttm_buffer_object *bo = *p_bo;
644 kref_put(&bo->kref, ttm_bo_release);
646 EXPORT_SYMBOL(ttm_bo_unref);
648 int ttm_bo_lock_delayed_workqueue(struct ttm_bo_device *bdev)
650 return cancel_delayed_work_sync(&bdev->wq);
652 EXPORT_SYMBOL(ttm_bo_lock_delayed_workqueue);
654 void ttm_bo_unlock_delayed_workqueue(struct ttm_bo_device *bdev, int resched)
657 schedule_delayed_work(&bdev->wq,
658 ((HZ / 100) < 1) ? 1 : HZ / 100);
660 EXPORT_SYMBOL(ttm_bo_unlock_delayed_workqueue);
662 static int ttm_bo_evict(struct ttm_buffer_object *bo, bool interruptible,
665 struct ttm_bo_device *bdev = bo->bdev;
666 struct ttm_mem_reg evict_mem;
667 struct ttm_placement placement;
670 spin_lock(&bdev->fence_lock);
671 ret = ttm_bo_wait(bo, false, interruptible, no_wait_gpu);
672 spin_unlock(&bdev->fence_lock);
674 if (unlikely(ret != 0)) {
675 if (ret != -ERESTARTSYS) {
676 pr_err("Failed to expire sync object before buffer eviction\n");
681 lockdep_assert_held(&bo->resv->lock.base);
684 evict_mem.mm_node = NULL;
685 evict_mem.bus.io_reserved_vm = false;
686 evict_mem.bus.io_reserved_count = 0;
690 placement.num_placement = 0;
691 placement.num_busy_placement = 0;
692 bdev->driver->evict_flags(bo, &placement);
693 ret = ttm_bo_mem_space(bo, &placement, &evict_mem, interruptible,
696 if (ret != -ERESTARTSYS) {
697 pr_err("Failed to find memory space for buffer 0x%p eviction\n",
699 ttm_bo_mem_space_debug(bo, &placement);
704 ret = ttm_bo_handle_move_mem(bo, &evict_mem, true, interruptible,
707 if (ret != -ERESTARTSYS)
708 pr_err("Buffer eviction failed\n");
709 ttm_bo_mem_put(bo, &evict_mem);
717 static int ttm_mem_evict_first(struct ttm_bo_device *bdev,
722 struct ttm_bo_global *glob = bdev->glob;
723 struct ttm_mem_type_manager *man = &bdev->man[mem_type];
724 struct ttm_buffer_object *bo;
725 int ret = -EBUSY, put_count;
727 spin_lock(&glob->lru_lock);
728 list_for_each_entry(bo, &man->lru, lru) {
729 ret = ttm_bo_reserve_nolru(bo, false, true, false, 0);
735 spin_unlock(&glob->lru_lock);
739 kref_get(&bo->list_kref);
741 if (!list_empty(&bo->ddestroy)) {
742 ret = ttm_bo_cleanup_refs_and_unlock(bo, interruptible,
744 kref_put(&bo->list_kref, ttm_bo_release_list);
748 put_count = ttm_bo_del_from_lru(bo);
749 spin_unlock(&glob->lru_lock);
753 ttm_bo_list_ref_sub(bo, put_count, true);
755 ret = ttm_bo_evict(bo, interruptible, no_wait_gpu);
756 ttm_bo_unreserve(bo);
758 kref_put(&bo->list_kref, ttm_bo_release_list);
762 void ttm_bo_mem_put(struct ttm_buffer_object *bo, struct ttm_mem_reg *mem)
764 struct ttm_mem_type_manager *man = &bo->bdev->man[mem->mem_type];
767 (*man->func->put_node)(man, mem);
769 EXPORT_SYMBOL(ttm_bo_mem_put);
772 * Repeatedly evict memory from the LRU for @mem_type until we create enough
773 * space, or we've evicted everything and there isn't enough space.
775 static int ttm_bo_mem_force_space(struct ttm_buffer_object *bo,
777 struct ttm_placement *placement,
778 struct ttm_mem_reg *mem,
782 struct ttm_bo_device *bdev = bo->bdev;
783 struct ttm_mem_type_manager *man = &bdev->man[mem_type];
787 ret = (*man->func->get_node)(man, bo, placement, mem);
788 if (unlikely(ret != 0))
792 ret = ttm_mem_evict_first(bdev, mem_type,
793 interruptible, no_wait_gpu);
794 if (unlikely(ret != 0))
797 if (mem->mm_node == NULL)
799 mem->mem_type = mem_type;
803 static uint32_t ttm_bo_select_caching(struct ttm_mem_type_manager *man,
804 uint32_t cur_placement,
805 uint32_t proposed_placement)
807 uint32_t caching = proposed_placement & TTM_PL_MASK_CACHING;
808 uint32_t result = proposed_placement & ~TTM_PL_MASK_CACHING;
811 * Keep current caching if possible.
814 if ((cur_placement & caching) != 0)
815 result |= (cur_placement & caching);
816 else if ((man->default_caching & caching) != 0)
817 result |= man->default_caching;
818 else if ((TTM_PL_FLAG_CACHED & caching) != 0)
819 result |= TTM_PL_FLAG_CACHED;
820 else if ((TTM_PL_FLAG_WC & caching) != 0)
821 result |= TTM_PL_FLAG_WC;
822 else if ((TTM_PL_FLAG_UNCACHED & caching) != 0)
823 result |= TTM_PL_FLAG_UNCACHED;
828 static bool ttm_bo_mt_compatible(struct ttm_mem_type_manager *man,
830 uint32_t proposed_placement,
831 uint32_t *masked_placement)
833 uint32_t cur_flags = ttm_bo_type_flags(mem_type);
835 if ((cur_flags & proposed_placement & TTM_PL_MASK_MEM) == 0)
838 if ((proposed_placement & man->available_caching) == 0)
841 cur_flags |= (proposed_placement & man->available_caching);
843 *masked_placement = cur_flags;
848 * Creates space for memory region @mem according to its type.
850 * This function first searches for free space in compatible memory types in
851 * the priority order defined by the driver. If free space isn't found, then
852 * ttm_bo_mem_force_space is attempted in priority order to evict and find
855 int ttm_bo_mem_space(struct ttm_buffer_object *bo,
856 struct ttm_placement *placement,
857 struct ttm_mem_reg *mem,
861 struct ttm_bo_device *bdev = bo->bdev;
862 struct ttm_mem_type_manager *man;
863 uint32_t mem_type = TTM_PL_SYSTEM;
864 uint32_t cur_flags = 0;
865 bool type_found = false;
866 bool type_ok = false;
867 bool has_erestartsys = false;
871 for (i = 0; i < placement->num_placement; ++i) {
872 ret = ttm_mem_type_from_flags(placement->placement[i],
876 man = &bdev->man[mem_type];
878 type_ok = ttm_bo_mt_compatible(man,
880 placement->placement[i],
886 cur_flags = ttm_bo_select_caching(man, bo->mem.placement,
889 * Use the access and other non-mapping-related flag bits from
890 * the memory placement flags to the current flags
892 ttm_flag_masked(&cur_flags, placement->placement[i],
893 ~TTM_PL_MASK_MEMTYPE);
895 if (mem_type == TTM_PL_SYSTEM)
898 if (man->has_type && man->use_type) {
900 ret = (*man->func->get_node)(man, bo, placement, mem);
908 if ((type_ok && (mem_type == TTM_PL_SYSTEM)) || mem->mm_node) {
909 mem->mem_type = mem_type;
910 mem->placement = cur_flags;
917 for (i = 0; i < placement->num_busy_placement; ++i) {
918 ret = ttm_mem_type_from_flags(placement->busy_placement[i],
922 man = &bdev->man[mem_type];
925 if (!ttm_bo_mt_compatible(man,
927 placement->busy_placement[i],
931 cur_flags = ttm_bo_select_caching(man, bo->mem.placement,
934 * Use the access and other non-mapping-related flag bits from
935 * the memory placement flags to the current flags
937 ttm_flag_masked(&cur_flags, placement->busy_placement[i],
938 ~TTM_PL_MASK_MEMTYPE);
941 if (mem_type == TTM_PL_SYSTEM) {
942 mem->mem_type = mem_type;
943 mem->placement = cur_flags;
948 ret = ttm_bo_mem_force_space(bo, mem_type, placement, mem,
949 interruptible, no_wait_gpu);
950 if (ret == 0 && mem->mm_node) {
951 mem->placement = cur_flags;
954 if (ret == -ERESTARTSYS)
955 has_erestartsys = true;
957 ret = (has_erestartsys) ? -ERESTARTSYS : -ENOMEM;
960 EXPORT_SYMBOL(ttm_bo_mem_space);
962 static int ttm_bo_move_buffer(struct ttm_buffer_object *bo,
963 struct ttm_placement *placement,
968 struct ttm_mem_reg mem;
969 struct ttm_bo_device *bdev = bo->bdev;
971 lockdep_assert_held(&bo->resv->lock.base);
974 * FIXME: It's possible to pipeline buffer moves.
975 * Have the driver move function wait for idle when necessary,
976 * instead of doing it here.
978 spin_lock(&bdev->fence_lock);
979 ret = ttm_bo_wait(bo, false, interruptible, no_wait_gpu);
980 spin_unlock(&bdev->fence_lock);
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 if (mem->mm_node && placement->lpfn != 0 &&
1010 (mem->start < placement->fpfn ||
1011 mem->start + mem->num_pages > placement->lpfn))
1014 for (i = 0; i < placement->num_placement; i++) {
1015 *new_flags = placement->placement[i];
1016 if ((*new_flags & mem->placement & TTM_PL_MASK_CACHING) &&
1017 (*new_flags & mem->placement & TTM_PL_MASK_MEM))
1021 for (i = 0; i < placement->num_busy_placement; i++) {
1022 *new_flags = placement->busy_placement[i];
1023 if ((*new_flags & mem->placement & TTM_PL_MASK_CACHING) &&
1024 (*new_flags & mem->placement & TTM_PL_MASK_MEM))
1031 int ttm_bo_validate(struct ttm_buffer_object *bo,
1032 struct ttm_placement *placement,
1039 lockdep_assert_held(&bo->resv->lock.base);
1040 /* Check that range is valid */
1041 if (placement->lpfn || placement->fpfn)
1042 if (placement->fpfn > placement->lpfn ||
1043 (placement->lpfn - placement->fpfn) < bo->num_pages)
1046 * Check whether we need to move buffer.
1048 if (!ttm_bo_mem_compat(placement, &bo->mem, &new_flags)) {
1049 ret = ttm_bo_move_buffer(bo, placement, interruptible,
1055 * Use the access and other non-mapping-related flag bits from
1056 * the compatible memory placement flags to the active flags
1058 ttm_flag_masked(&bo->mem.placement, new_flags,
1059 ~TTM_PL_MASK_MEMTYPE);
1062 * We might need to add a TTM.
1064 if (bo->mem.mem_type == TTM_PL_SYSTEM && bo->ttm == NULL) {
1065 ret = ttm_bo_add_ttm(bo, true);
1071 EXPORT_SYMBOL(ttm_bo_validate);
1073 int ttm_bo_check_placement(struct ttm_buffer_object *bo,
1074 struct ttm_placement *placement)
1076 BUG_ON((placement->fpfn || placement->lpfn) &&
1077 (bo->mem.num_pages > (placement->lpfn - placement->fpfn)));
1082 int ttm_bo_init(struct ttm_bo_device *bdev,
1083 struct ttm_buffer_object *bo,
1085 enum ttm_bo_type type,
1086 struct ttm_placement *placement,
1087 uint32_t page_alignment,
1089 struct file *persistent_swap_storage,
1091 struct sg_table *sg,
1092 void (*destroy) (struct ttm_buffer_object *))
1095 unsigned long num_pages;
1096 struct ttm_mem_global *mem_glob = bdev->glob->mem_glob;
1099 ret = ttm_mem_global_alloc(mem_glob, acc_size, false, false);
1101 pr_err("Out of kernel memory\n");
1109 num_pages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
1110 if (num_pages == 0) {
1111 pr_err("Illegal buffer object size\n");
1116 ttm_mem_global_free(mem_glob, acc_size);
1119 bo->destroy = destroy;
1121 kref_init(&bo->kref);
1122 kref_init(&bo->list_kref);
1123 atomic_set(&bo->cpu_writers, 0);
1124 INIT_LIST_HEAD(&bo->lru);
1125 INIT_LIST_HEAD(&bo->ddestroy);
1126 INIT_LIST_HEAD(&bo->swap);
1127 INIT_LIST_HEAD(&bo->io_reserve_lru);
1128 mutex_init(&bo->wu_mutex);
1130 bo->glob = bdev->glob;
1132 bo->num_pages = num_pages;
1133 bo->mem.size = num_pages << PAGE_SHIFT;
1134 bo->mem.mem_type = TTM_PL_SYSTEM;
1135 bo->mem.num_pages = bo->num_pages;
1136 bo->mem.mm_node = NULL;
1137 bo->mem.page_alignment = page_alignment;
1138 bo->mem.bus.io_reserved_vm = false;
1139 bo->mem.bus.io_reserved_count = 0;
1141 bo->mem.placement = (TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED);
1142 bo->persistent_swap_storage = persistent_swap_storage;
1143 bo->acc_size = acc_size;
1145 bo->resv = &bo->ttm_resv;
1146 reservation_object_init(bo->resv);
1147 atomic_inc(&bo->glob->bo_count);
1148 drm_vma_node_reset(&bo->vma_node);
1150 ret = ttm_bo_check_placement(bo, placement);
1153 * For ttm_bo_type_device buffers, allocate
1154 * address space from the device.
1157 (bo->type == ttm_bo_type_device ||
1158 bo->type == ttm_bo_type_sg))
1159 ret = drm_vma_offset_add(&bdev->vma_manager, &bo->vma_node,
1162 locked = ww_mutex_trylock(&bo->resv->lock);
1166 ret = ttm_bo_validate(bo, placement, interruptible, false);
1168 ttm_bo_unreserve(bo);
1175 EXPORT_SYMBOL(ttm_bo_init);
1177 size_t ttm_bo_acc_size(struct ttm_bo_device *bdev,
1178 unsigned long bo_size,
1179 unsigned struct_size)
1181 unsigned npages = (PAGE_ALIGN(bo_size)) >> PAGE_SHIFT;
1184 size += ttm_round_pot(struct_size);
1185 size += PAGE_ALIGN(npages * sizeof(void *));
1186 size += ttm_round_pot(sizeof(struct ttm_tt));
1189 EXPORT_SYMBOL(ttm_bo_acc_size);
1191 size_t ttm_bo_dma_acc_size(struct ttm_bo_device *bdev,
1192 unsigned long bo_size,
1193 unsigned struct_size)
1195 unsigned npages = (PAGE_ALIGN(bo_size)) >> PAGE_SHIFT;
1198 size += ttm_round_pot(struct_size);
1199 size += PAGE_ALIGN(npages * sizeof(void *));
1200 size += PAGE_ALIGN(npages * sizeof(dma_addr_t));
1201 size += ttm_round_pot(sizeof(struct ttm_dma_tt));
1204 EXPORT_SYMBOL(ttm_bo_dma_acc_size);
1206 int ttm_bo_create(struct ttm_bo_device *bdev,
1208 enum ttm_bo_type type,
1209 struct ttm_placement *placement,
1210 uint32_t page_alignment,
1212 struct file *persistent_swap_storage,
1213 struct ttm_buffer_object **p_bo)
1215 struct ttm_buffer_object *bo;
1219 bo = kzalloc(sizeof(*bo), GFP_KERNEL);
1220 if (unlikely(bo == NULL))
1223 acc_size = ttm_bo_acc_size(bdev, size, sizeof(struct ttm_buffer_object));
1224 ret = ttm_bo_init(bdev, bo, size, type, placement, page_alignment,
1225 interruptible, persistent_swap_storage, acc_size,
1227 if (likely(ret == 0))
1232 EXPORT_SYMBOL(ttm_bo_create);
1234 static int ttm_bo_force_list_clean(struct ttm_bo_device *bdev,
1235 unsigned mem_type, bool allow_errors)
1237 struct ttm_mem_type_manager *man = &bdev->man[mem_type];
1238 struct ttm_bo_global *glob = bdev->glob;
1242 * Can't use standard list traversal since we're unlocking.
1245 spin_lock(&glob->lru_lock);
1246 while (!list_empty(&man->lru)) {
1247 spin_unlock(&glob->lru_lock);
1248 ret = ttm_mem_evict_first(bdev, mem_type, false, false);
1253 pr_err("Cleanup eviction failed\n");
1256 spin_lock(&glob->lru_lock);
1258 spin_unlock(&glob->lru_lock);
1262 int ttm_bo_clean_mm(struct ttm_bo_device *bdev, unsigned mem_type)
1264 struct ttm_mem_type_manager *man;
1267 if (mem_type >= TTM_NUM_MEM_TYPES) {
1268 pr_err("Illegal memory type %d\n", mem_type);
1271 man = &bdev->man[mem_type];
1273 if (!man->has_type) {
1274 pr_err("Trying to take down uninitialized memory manager type %u\n",
1279 man->use_type = false;
1280 man->has_type = false;
1284 ttm_bo_force_list_clean(bdev, mem_type, false);
1286 ret = (*man->func->takedown)(man);
1291 EXPORT_SYMBOL(ttm_bo_clean_mm);
1293 int ttm_bo_evict_mm(struct ttm_bo_device *bdev, unsigned mem_type)
1295 struct ttm_mem_type_manager *man = &bdev->man[mem_type];
1297 if (mem_type == 0 || mem_type >= TTM_NUM_MEM_TYPES) {
1298 pr_err("Illegal memory manager memory type %u\n", mem_type);
1302 if (!man->has_type) {
1303 pr_err("Memory type %u has not been initialized\n", mem_type);
1307 return ttm_bo_force_list_clean(bdev, mem_type, true);
1309 EXPORT_SYMBOL(ttm_bo_evict_mm);
1311 int ttm_bo_init_mm(struct ttm_bo_device *bdev, unsigned type,
1312 unsigned long p_size)
1315 struct ttm_mem_type_manager *man;
1317 BUG_ON(type >= TTM_NUM_MEM_TYPES);
1318 man = &bdev->man[type];
1319 BUG_ON(man->has_type);
1320 man->io_reserve_fastpath = true;
1321 man->use_io_reserve_lru = false;
1322 mutex_init(&man->io_reserve_mutex);
1323 INIT_LIST_HEAD(&man->io_reserve_lru);
1325 ret = bdev->driver->init_mem_type(bdev, type, man);
1331 if (type != TTM_PL_SYSTEM) {
1332 ret = (*man->func->init)(man, p_size);
1336 man->has_type = true;
1337 man->use_type = true;
1340 INIT_LIST_HEAD(&man->lru);
1344 EXPORT_SYMBOL(ttm_bo_init_mm);
1346 static void ttm_bo_global_kobj_release(struct kobject *kobj)
1348 struct ttm_bo_global *glob =
1349 container_of(kobj, struct ttm_bo_global, kobj);
1351 ttm_mem_unregister_shrink(glob->mem_glob, &glob->shrink);
1352 __free_page(glob->dummy_read_page);
1356 void ttm_bo_global_release(struct drm_global_reference *ref)
1358 struct ttm_bo_global *glob = ref->object;
1360 kobject_del(&glob->kobj);
1361 kobject_put(&glob->kobj);
1363 EXPORT_SYMBOL(ttm_bo_global_release);
1365 int ttm_bo_global_init(struct drm_global_reference *ref)
1367 struct ttm_bo_global_ref *bo_ref =
1368 container_of(ref, struct ttm_bo_global_ref, ref);
1369 struct ttm_bo_global *glob = ref->object;
1372 mutex_init(&glob->device_list_mutex);
1373 spin_lock_init(&glob->lru_lock);
1374 glob->mem_glob = bo_ref->mem_glob;
1375 glob->dummy_read_page = alloc_page(__GFP_ZERO | GFP_DMA32);
1377 if (unlikely(glob->dummy_read_page == NULL)) {
1382 INIT_LIST_HEAD(&glob->swap_lru);
1383 INIT_LIST_HEAD(&glob->device_list);
1385 ttm_mem_init_shrink(&glob->shrink, ttm_bo_swapout);
1386 ret = ttm_mem_register_shrink(glob->mem_glob, &glob->shrink);
1387 if (unlikely(ret != 0)) {
1388 pr_err("Could not register buffer object swapout\n");
1392 atomic_set(&glob->bo_count, 0);
1394 ret = kobject_init_and_add(
1395 &glob->kobj, &ttm_bo_glob_kobj_type, ttm_get_kobj(), "buffer_objects");
1396 if (unlikely(ret != 0))
1397 kobject_put(&glob->kobj);
1400 __free_page(glob->dummy_read_page);
1405 EXPORT_SYMBOL(ttm_bo_global_init);
1408 int ttm_bo_device_release(struct ttm_bo_device *bdev)
1411 unsigned i = TTM_NUM_MEM_TYPES;
1412 struct ttm_mem_type_manager *man;
1413 struct ttm_bo_global *glob = bdev->glob;
1416 man = &bdev->man[i];
1417 if (man->has_type) {
1418 man->use_type = false;
1419 if ((i != TTM_PL_SYSTEM) && ttm_bo_clean_mm(bdev, i)) {
1421 pr_err("DRM memory manager type %d is not clean\n",
1424 man->has_type = false;
1428 mutex_lock(&glob->device_list_mutex);
1429 list_del(&bdev->device_list);
1430 mutex_unlock(&glob->device_list_mutex);
1432 cancel_delayed_work_sync(&bdev->wq);
1434 while (ttm_bo_delayed_delete(bdev, true))
1437 spin_lock(&glob->lru_lock);
1438 if (list_empty(&bdev->ddestroy))
1439 TTM_DEBUG("Delayed destroy list was clean\n");
1441 if (list_empty(&bdev->man[0].lru))
1442 TTM_DEBUG("Swap list was clean\n");
1443 spin_unlock(&glob->lru_lock);
1445 drm_vma_offset_manager_destroy(&bdev->vma_manager);
1449 EXPORT_SYMBOL(ttm_bo_device_release);
1451 int ttm_bo_device_init(struct ttm_bo_device *bdev,
1452 struct ttm_bo_global *glob,
1453 struct ttm_bo_driver *driver,
1454 uint64_t file_page_offset,
1459 bdev->driver = driver;
1461 memset(bdev->man, 0, sizeof(bdev->man));
1464 * Initialize the system memory buffer type.
1465 * Other types need to be driver / IOCTL initialized.
1467 ret = ttm_bo_init_mm(bdev, TTM_PL_SYSTEM, 0);
1468 if (unlikely(ret != 0))
1471 drm_vma_offset_manager_init(&bdev->vma_manager, file_page_offset,
1473 INIT_DELAYED_WORK(&bdev->wq, ttm_bo_delayed_workqueue);
1474 INIT_LIST_HEAD(&bdev->ddestroy);
1475 bdev->dev_mapping = NULL;
1477 bdev->need_dma32 = need_dma32;
1479 spin_lock_init(&bdev->fence_lock);
1480 mutex_lock(&glob->device_list_mutex);
1481 list_add_tail(&bdev->device_list, &glob->device_list);
1482 mutex_unlock(&glob->device_list_mutex);
1488 EXPORT_SYMBOL(ttm_bo_device_init);
1491 * buffer object vm functions.
1494 bool ttm_mem_reg_is_pci(struct ttm_bo_device *bdev, struct ttm_mem_reg *mem)
1496 struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
1498 if (!(man->flags & TTM_MEMTYPE_FLAG_FIXED)) {
1499 if (mem->mem_type == TTM_PL_SYSTEM)
1502 if (man->flags & TTM_MEMTYPE_FLAG_CMA)
1505 if (mem->placement & TTM_PL_FLAG_CACHED)
1511 void ttm_bo_unmap_virtual_locked(struct ttm_buffer_object *bo)
1513 struct ttm_bo_device *bdev = bo->bdev;
1515 drm_vma_node_unmap(&bo->vma_node, bdev->dev_mapping);
1516 ttm_mem_io_free_vm(bo);
1519 void ttm_bo_unmap_virtual(struct ttm_buffer_object *bo)
1521 struct ttm_bo_device *bdev = bo->bdev;
1522 struct ttm_mem_type_manager *man = &bdev->man[bo->mem.mem_type];
1524 ttm_mem_io_lock(man, false);
1525 ttm_bo_unmap_virtual_locked(bo);
1526 ttm_mem_io_unlock(man);
1530 EXPORT_SYMBOL(ttm_bo_unmap_virtual);
1533 int ttm_bo_wait(struct ttm_buffer_object *bo,
1534 bool lazy, bool interruptible, bool no_wait)
1536 struct ttm_bo_driver *driver = bo->bdev->driver;
1537 struct ttm_bo_device *bdev = bo->bdev;
1541 if (likely(bo->sync_obj == NULL))
1544 while (bo->sync_obj) {
1546 if (driver->sync_obj_signaled(bo->sync_obj)) {
1547 void *tmp_obj = bo->sync_obj;
1548 bo->sync_obj = NULL;
1549 clear_bit(TTM_BO_PRIV_FLAG_MOVING, &bo->priv_flags);
1550 spin_unlock(&bdev->fence_lock);
1551 driver->sync_obj_unref(&tmp_obj);
1552 spin_lock(&bdev->fence_lock);
1559 sync_obj = driver->sync_obj_ref(bo->sync_obj);
1560 spin_unlock(&bdev->fence_lock);
1561 ret = driver->sync_obj_wait(sync_obj,
1562 lazy, interruptible);
1563 if (unlikely(ret != 0)) {
1564 driver->sync_obj_unref(&sync_obj);
1565 spin_lock(&bdev->fence_lock);
1568 spin_lock(&bdev->fence_lock);
1569 if (likely(bo->sync_obj == sync_obj)) {
1570 void *tmp_obj = bo->sync_obj;
1571 bo->sync_obj = NULL;
1572 clear_bit(TTM_BO_PRIV_FLAG_MOVING,
1574 spin_unlock(&bdev->fence_lock);
1575 driver->sync_obj_unref(&sync_obj);
1576 driver->sync_obj_unref(&tmp_obj);
1577 spin_lock(&bdev->fence_lock);
1579 spin_unlock(&bdev->fence_lock);
1580 driver->sync_obj_unref(&sync_obj);
1581 spin_lock(&bdev->fence_lock);
1586 EXPORT_SYMBOL(ttm_bo_wait);
1588 int ttm_bo_synccpu_write_grab(struct ttm_buffer_object *bo, bool no_wait)
1590 struct ttm_bo_device *bdev = bo->bdev;
1594 * Using ttm_bo_reserve makes sure the lru lists are updated.
1597 ret = ttm_bo_reserve(bo, true, no_wait, false, 0);
1598 if (unlikely(ret != 0))
1600 spin_lock(&bdev->fence_lock);
1601 ret = ttm_bo_wait(bo, false, true, no_wait);
1602 spin_unlock(&bdev->fence_lock);
1603 if (likely(ret == 0))
1604 atomic_inc(&bo->cpu_writers);
1605 ttm_bo_unreserve(bo);
1608 EXPORT_SYMBOL(ttm_bo_synccpu_write_grab);
1610 void ttm_bo_synccpu_write_release(struct ttm_buffer_object *bo)
1612 atomic_dec(&bo->cpu_writers);
1614 EXPORT_SYMBOL(ttm_bo_synccpu_write_release);
1617 * A buffer object shrink method that tries to swap out the first
1618 * buffer object on the bo_global::swap_lru list.
1621 static int ttm_bo_swapout(struct ttm_mem_shrink *shrink)
1623 struct ttm_bo_global *glob =
1624 container_of(shrink, struct ttm_bo_global, shrink);
1625 struct ttm_buffer_object *bo;
1628 uint32_t swap_placement = (TTM_PL_FLAG_CACHED | TTM_PL_FLAG_SYSTEM);
1630 spin_lock(&glob->lru_lock);
1631 list_for_each_entry(bo, &glob->swap_lru, swap) {
1632 ret = ttm_bo_reserve_nolru(bo, false, true, false, 0);
1638 spin_unlock(&glob->lru_lock);
1642 kref_get(&bo->list_kref);
1644 if (!list_empty(&bo->ddestroy)) {
1645 ret = ttm_bo_cleanup_refs_and_unlock(bo, false, false);
1646 kref_put(&bo->list_kref, ttm_bo_release_list);
1650 put_count = ttm_bo_del_from_lru(bo);
1651 spin_unlock(&glob->lru_lock);
1653 ttm_bo_list_ref_sub(bo, put_count, true);
1656 * Wait for GPU, then move to system cached.
1659 spin_lock(&bo->bdev->fence_lock);
1660 ret = ttm_bo_wait(bo, false, false, false);
1661 spin_unlock(&bo->bdev->fence_lock);
1663 if (unlikely(ret != 0))
1666 if ((bo->mem.placement & swap_placement) != swap_placement) {
1667 struct ttm_mem_reg evict_mem;
1669 evict_mem = bo->mem;
1670 evict_mem.mm_node = NULL;
1671 evict_mem.placement = TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED;
1672 evict_mem.mem_type = TTM_PL_SYSTEM;
1674 ret = ttm_bo_handle_move_mem(bo, &evict_mem, true,
1676 if (unlikely(ret != 0))
1680 ttm_bo_unmap_virtual(bo);
1683 * Swap out. Buffer will be swapped in again as soon as
1684 * anyone tries to access a ttm page.
1687 if (bo->bdev->driver->swap_notify)
1688 bo->bdev->driver->swap_notify(bo);
1690 ret = ttm_tt_swapout(bo->ttm, bo->persistent_swap_storage);
1695 * Unreserve without putting on LRU to avoid swapping out an
1696 * already swapped buffer.
1699 ww_mutex_unlock(&bo->resv->lock);
1700 kref_put(&bo->list_kref, ttm_bo_release_list);
1704 void ttm_bo_swapout_all(struct ttm_bo_device *bdev)
1706 while (ttm_bo_swapout(&bdev->glob->shrink) == 0)
1709 EXPORT_SYMBOL(ttm_bo_swapout_all);
1712 * ttm_bo_wait_unreserved - interruptible wait for a buffer object to become
1715 * @bo: Pointer to buffer
1717 int ttm_bo_wait_unreserved(struct ttm_buffer_object *bo)
1722 * In the absense of a wait_unlocked API,
1723 * Use the bo::wu_mutex to avoid triggering livelocks due to
1724 * concurrent use of this function. Note that this use of
1725 * bo::wu_mutex can go away if we change locking order to
1726 * mmap_sem -> bo::reserve.
1728 ret = mutex_lock_interruptible(&bo->wu_mutex);
1729 if (unlikely(ret != 0))
1730 return -ERESTARTSYS;
1731 if (!ww_mutex_is_locked(&bo->resv->lock))
1733 ret = ttm_bo_reserve_nolru(bo, true, false, false, NULL);
1734 if (unlikely(ret != 0))
1736 ww_mutex_unlock(&bo->resv->lock);
1739 mutex_unlock(&bo->wu_mutex);