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 pos = ffs(place->flags & TTM_PL_MASK_MEM);
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));
149 ttm_tt_destroy(bo->ttm);
150 atomic_dec(&bo->glob->bo_count);
151 fence_put(bo->moving);
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;
167 lockdep_assert_held(&bo->resv->lock.base);
169 if (!(bo->mem.placement & TTM_PL_FLAG_NO_EVICT)) {
171 BUG_ON(!list_empty(&bo->lru));
173 list_add(&bo->lru, bdev->driver->lru_tail(bo));
174 kref_get(&bo->list_kref);
176 if (bo->ttm && !(bo->ttm->page_flags & TTM_PAGE_FLAG_SG)) {
177 list_add(&bo->swap, bdev->driver->swap_lru_tail(bo));
178 kref_get(&bo->list_kref);
182 EXPORT_SYMBOL(ttm_bo_add_to_lru);
184 int ttm_bo_del_from_lru(struct ttm_buffer_object *bo)
186 struct ttm_bo_device *bdev = bo->bdev;
189 if (bdev->driver->lru_removal)
190 bdev->driver->lru_removal(bo);
192 if (!list_empty(&bo->swap)) {
193 list_del_init(&bo->swap);
196 if (!list_empty(&bo->lru)) {
197 list_del_init(&bo->lru);
204 static void ttm_bo_ref_bug(struct kref *list_kref)
209 void ttm_bo_list_ref_sub(struct ttm_buffer_object *bo, int count,
212 kref_sub(&bo->list_kref, count,
213 (never_free) ? ttm_bo_ref_bug : ttm_bo_release_list);
216 void ttm_bo_del_sub_from_lru(struct ttm_buffer_object *bo)
220 spin_lock(&bo->glob->lru_lock);
221 put_count = ttm_bo_del_from_lru(bo);
222 spin_unlock(&bo->glob->lru_lock);
223 ttm_bo_list_ref_sub(bo, put_count, true);
225 EXPORT_SYMBOL(ttm_bo_del_sub_from_lru);
227 void ttm_bo_move_to_lru_tail(struct ttm_buffer_object *bo)
229 struct ttm_bo_device *bdev = bo->bdev;
232 lockdep_assert_held(&bo->resv->lock.base);
234 if (bdev->driver->lru_removal)
235 bdev->driver->lru_removal(bo);
237 put_count = ttm_bo_del_from_lru(bo);
238 ttm_bo_list_ref_sub(bo, put_count, true);
239 ttm_bo_add_to_lru(bo);
241 EXPORT_SYMBOL(ttm_bo_move_to_lru_tail);
243 struct list_head *ttm_bo_default_lru_tail(struct ttm_buffer_object *bo)
245 return bo->bdev->man[bo->mem.mem_type].lru.prev;
247 EXPORT_SYMBOL(ttm_bo_default_lru_tail);
249 struct list_head *ttm_bo_default_swap_lru_tail(struct ttm_buffer_object *bo)
251 return bo->glob->swap_lru.prev;
253 EXPORT_SYMBOL(ttm_bo_default_swap_lru_tail);
256 * Call bo->mutex locked.
258 static int ttm_bo_add_ttm(struct ttm_buffer_object *bo, bool zero_alloc)
260 struct ttm_bo_device *bdev = bo->bdev;
261 struct ttm_bo_global *glob = bo->glob;
263 uint32_t page_flags = 0;
265 TTM_ASSERT_LOCKED(&bo->mutex);
268 if (bdev->need_dma32)
269 page_flags |= TTM_PAGE_FLAG_DMA32;
272 case ttm_bo_type_device:
274 page_flags |= TTM_PAGE_FLAG_ZERO_ALLOC;
275 case ttm_bo_type_kernel:
276 bo->ttm = bdev->driver->ttm_tt_create(bdev, bo->num_pages << PAGE_SHIFT,
277 page_flags, glob->dummy_read_page);
278 if (unlikely(bo->ttm == NULL))
282 bo->ttm = bdev->driver->ttm_tt_create(bdev, bo->num_pages << PAGE_SHIFT,
283 page_flags | TTM_PAGE_FLAG_SG,
284 glob->dummy_read_page);
285 if (unlikely(bo->ttm == NULL)) {
289 bo->ttm->sg = bo->sg;
292 pr_err("Illegal buffer object type\n");
300 static int ttm_bo_handle_move_mem(struct ttm_buffer_object *bo,
301 struct ttm_mem_reg *mem,
302 bool evict, bool interruptible,
305 struct ttm_bo_device *bdev = bo->bdev;
306 bool old_is_pci = ttm_mem_reg_is_pci(bdev, &bo->mem);
307 bool new_is_pci = ttm_mem_reg_is_pci(bdev, mem);
308 struct ttm_mem_type_manager *old_man = &bdev->man[bo->mem.mem_type];
309 struct ttm_mem_type_manager *new_man = &bdev->man[mem->mem_type];
312 if (old_is_pci || new_is_pci ||
313 ((mem->placement & bo->mem.placement & TTM_PL_MASK_CACHING) == 0)) {
314 ret = ttm_mem_io_lock(old_man, true);
315 if (unlikely(ret != 0))
317 ttm_bo_unmap_virtual_locked(bo);
318 ttm_mem_io_unlock(old_man);
322 * Create and bind a ttm if required.
325 if (!(new_man->flags & TTM_MEMTYPE_FLAG_FIXED)) {
326 if (bo->ttm == NULL) {
327 bool zero = !(old_man->flags & TTM_MEMTYPE_FLAG_FIXED);
328 ret = ttm_bo_add_ttm(bo, zero);
333 ret = ttm_tt_set_placement_caching(bo->ttm, mem->placement);
337 if (mem->mem_type != TTM_PL_SYSTEM) {
338 ret = ttm_tt_bind(bo->ttm, mem);
343 if (bo->mem.mem_type == TTM_PL_SYSTEM) {
344 if (bdev->driver->move_notify)
345 bdev->driver->move_notify(bo, mem);
352 if (bdev->driver->move_notify)
353 bdev->driver->move_notify(bo, mem);
355 if (!(old_man->flags & TTM_MEMTYPE_FLAG_FIXED) &&
356 !(new_man->flags & TTM_MEMTYPE_FLAG_FIXED))
357 ret = ttm_bo_move_ttm(bo, interruptible, no_wait_gpu, mem);
358 else if (bdev->driver->move)
359 ret = bdev->driver->move(bo, evict, interruptible,
362 ret = ttm_bo_move_memcpy(bo, interruptible, no_wait_gpu, mem);
365 if (bdev->driver->move_notify) {
366 struct ttm_mem_reg tmp_mem = *mem;
369 bdev->driver->move_notify(bo, mem);
379 if (bdev->driver->invalidate_caches) {
380 ret = bdev->driver->invalidate_caches(bdev, bo->mem.placement);
382 pr_err("Can not flush read caches\n");
387 if (bo->mem.mm_node) {
388 bo->offset = (bo->mem.start << PAGE_SHIFT) +
389 bdev->man[bo->mem.mem_type].gpu_offset;
390 bo->cur_placement = bo->mem.placement;
397 new_man = &bdev->man[bo->mem.mem_type];
398 if (new_man->flags & TTM_MEMTYPE_FLAG_FIXED) {
399 ttm_tt_destroy(bo->ttm);
408 * Will release GPU memory type usage on destruction.
409 * This is the place to put in driver specific hooks to release
410 * driver private resources.
411 * Will release the bo::reserved lock.
414 static void ttm_bo_cleanup_memtype_use(struct ttm_buffer_object *bo)
416 if (bo->bdev->driver->move_notify)
417 bo->bdev->driver->move_notify(bo, NULL);
419 ttm_tt_destroy(bo->ttm);
421 ttm_bo_mem_put(bo, &bo->mem);
423 ww_mutex_unlock (&bo->resv->lock);
426 static void ttm_bo_flush_all_fences(struct ttm_buffer_object *bo)
428 struct reservation_object_list *fobj;
432 fobj = reservation_object_get_list(bo->resv);
433 fence = reservation_object_get_excl(bo->resv);
434 if (fence && !fence->ops->signaled)
435 fence_enable_sw_signaling(fence);
437 for (i = 0; fobj && i < fobj->shared_count; ++i) {
438 fence = rcu_dereference_protected(fobj->shared[i],
439 reservation_object_held(bo->resv));
441 if (!fence->ops->signaled)
442 fence_enable_sw_signaling(fence);
446 static void ttm_bo_cleanup_refs_or_queue(struct ttm_buffer_object *bo)
448 struct ttm_bo_device *bdev = bo->bdev;
449 struct ttm_bo_global *glob = bo->glob;
453 spin_lock(&glob->lru_lock);
454 ret = __ttm_bo_reserve(bo, false, true, NULL);
457 if (!ttm_bo_wait(bo, false, true)) {
458 put_count = ttm_bo_del_from_lru(bo);
460 spin_unlock(&glob->lru_lock);
461 ttm_bo_cleanup_memtype_use(bo);
463 ttm_bo_list_ref_sub(bo, put_count, true);
467 ttm_bo_flush_all_fences(bo);
470 * Make NO_EVICT bos immediately available to
471 * shrinkers, now that they are queued for
474 if (bo->mem.placement & TTM_PL_FLAG_NO_EVICT) {
475 bo->mem.placement &= ~TTM_PL_FLAG_NO_EVICT;
476 ttm_bo_add_to_lru(bo);
479 __ttm_bo_unreserve(bo);
482 kref_get(&bo->list_kref);
483 list_add_tail(&bo->ddestroy, &bdev->ddestroy);
484 spin_unlock(&glob->lru_lock);
486 schedule_delayed_work(&bdev->wq,
487 ((HZ / 100) < 1) ? 1 : HZ / 100);
491 * function ttm_bo_cleanup_refs_and_unlock
492 * If bo idle, remove from delayed- and lru lists, and unref.
493 * If not idle, do nothing.
495 * Must be called with lru_lock and reservation held, this function
496 * will drop both before returning.
498 * @interruptible Any sleeps should occur interruptibly.
499 * @no_wait_gpu Never wait for gpu. Return -EBUSY instead.
502 static int ttm_bo_cleanup_refs_and_unlock(struct ttm_buffer_object *bo,
506 struct ttm_bo_global *glob = bo->glob;
510 ret = ttm_bo_wait(bo, false, true);
512 if (ret && !no_wait_gpu) {
514 ww_mutex_unlock(&bo->resv->lock);
515 spin_unlock(&glob->lru_lock);
517 lret = reservation_object_wait_timeout_rcu(bo->resv,
527 spin_lock(&glob->lru_lock);
528 ret = __ttm_bo_reserve(bo, false, true, NULL);
531 * We raced, and lost, someone else holds the reservation now,
532 * and is probably busy in ttm_bo_cleanup_memtype_use.
534 * Even if it's not the case, because we finished waiting any
535 * delayed destruction would succeed, so just return success
539 spin_unlock(&glob->lru_lock);
544 * remove sync_obj with ttm_bo_wait, the wait should be
545 * finished, and no new wait object should have been added.
547 ret = ttm_bo_wait(bo, false, true);
551 if (ret || unlikely(list_empty(&bo->ddestroy))) {
552 __ttm_bo_unreserve(bo);
553 spin_unlock(&glob->lru_lock);
557 put_count = ttm_bo_del_from_lru(bo);
558 list_del_init(&bo->ddestroy);
561 spin_unlock(&glob->lru_lock);
562 ttm_bo_cleanup_memtype_use(bo);
564 ttm_bo_list_ref_sub(bo, put_count, true);
570 * Traverse the delayed list, and call ttm_bo_cleanup_refs on all
571 * encountered buffers.
574 static int ttm_bo_delayed_delete(struct ttm_bo_device *bdev, bool remove_all)
576 struct ttm_bo_global *glob = bdev->glob;
577 struct ttm_buffer_object *entry = NULL;
580 spin_lock(&glob->lru_lock);
581 if (list_empty(&bdev->ddestroy))
584 entry = list_first_entry(&bdev->ddestroy,
585 struct ttm_buffer_object, ddestroy);
586 kref_get(&entry->list_kref);
589 struct ttm_buffer_object *nentry = NULL;
591 if (entry->ddestroy.next != &bdev->ddestroy) {
592 nentry = list_first_entry(&entry->ddestroy,
593 struct ttm_buffer_object, ddestroy);
594 kref_get(&nentry->list_kref);
597 ret = __ttm_bo_reserve(entry, false, true, NULL);
598 if (remove_all && ret) {
599 spin_unlock(&glob->lru_lock);
600 ret = __ttm_bo_reserve(entry, false, false, NULL);
601 spin_lock(&glob->lru_lock);
605 ret = ttm_bo_cleanup_refs_and_unlock(entry, false,
608 spin_unlock(&glob->lru_lock);
610 kref_put(&entry->list_kref, ttm_bo_release_list);
616 spin_lock(&glob->lru_lock);
617 if (list_empty(&entry->ddestroy))
622 spin_unlock(&glob->lru_lock);
625 kref_put(&entry->list_kref, ttm_bo_release_list);
629 static void ttm_bo_delayed_workqueue(struct work_struct *work)
631 struct ttm_bo_device *bdev =
632 container_of(work, struct ttm_bo_device, wq.work);
634 if (ttm_bo_delayed_delete(bdev, false)) {
635 schedule_delayed_work(&bdev->wq,
636 ((HZ / 100) < 1) ? 1 : HZ / 100);
640 static void ttm_bo_release(struct kref *kref)
642 struct ttm_buffer_object *bo =
643 container_of(kref, struct ttm_buffer_object, kref);
644 struct ttm_bo_device *bdev = bo->bdev;
645 struct ttm_mem_type_manager *man = &bdev->man[bo->mem.mem_type];
647 drm_vma_offset_remove(&bdev->vma_manager, &bo->vma_node);
648 ttm_mem_io_lock(man, false);
649 ttm_mem_io_free_vm(bo);
650 ttm_mem_io_unlock(man);
651 ttm_bo_cleanup_refs_or_queue(bo);
652 kref_put(&bo->list_kref, ttm_bo_release_list);
655 void ttm_bo_unref(struct ttm_buffer_object **p_bo)
657 struct ttm_buffer_object *bo = *p_bo;
660 kref_put(&bo->kref, ttm_bo_release);
662 EXPORT_SYMBOL(ttm_bo_unref);
664 int ttm_bo_lock_delayed_workqueue(struct ttm_bo_device *bdev)
666 return cancel_delayed_work_sync(&bdev->wq);
668 EXPORT_SYMBOL(ttm_bo_lock_delayed_workqueue);
670 void ttm_bo_unlock_delayed_workqueue(struct ttm_bo_device *bdev, int resched)
673 schedule_delayed_work(&bdev->wq,
674 ((HZ / 100) < 1) ? 1 : HZ / 100);
676 EXPORT_SYMBOL(ttm_bo_unlock_delayed_workqueue);
678 static int ttm_bo_evict(struct ttm_buffer_object *bo, bool interruptible,
681 struct ttm_bo_device *bdev = bo->bdev;
682 struct ttm_mem_reg evict_mem;
683 struct ttm_placement placement;
686 lockdep_assert_held(&bo->resv->lock.base);
689 evict_mem.mm_node = NULL;
690 evict_mem.bus.io_reserved_vm = false;
691 evict_mem.bus.io_reserved_count = 0;
693 placement.num_placement = 0;
694 placement.num_busy_placement = 0;
695 bdev->driver->evict_flags(bo, &placement);
696 ret = ttm_bo_mem_space(bo, &placement, &evict_mem, interruptible,
699 if (ret != -ERESTARTSYS) {
700 pr_err("Failed to find memory space for buffer 0x%p eviction\n",
702 ttm_bo_mem_space_debug(bo, &placement);
707 ret = ttm_bo_handle_move_mem(bo, &evict_mem, true, interruptible,
710 if (ret != -ERESTARTSYS)
711 pr_err("Buffer eviction failed\n");
712 ttm_bo_mem_put(bo, &evict_mem);
720 static int ttm_mem_evict_first(struct ttm_bo_device *bdev,
722 const struct ttm_place *place,
726 struct ttm_bo_global *glob = bdev->glob;
727 struct ttm_mem_type_manager *man = &bdev->man[mem_type];
728 struct ttm_buffer_object *bo;
729 int ret = -EBUSY, put_count;
731 spin_lock(&glob->lru_lock);
732 list_for_each_entry(bo, &man->lru, lru) {
733 ret = __ttm_bo_reserve(bo, false, true, NULL);
735 if (place && (place->fpfn || place->lpfn)) {
736 /* Don't evict this BO if it's outside of the
737 * requested placement range
739 if (place->fpfn >= (bo->mem.start + bo->mem.size) ||
740 (place->lpfn && place->lpfn <= bo->mem.start)) {
741 __ttm_bo_unreserve(bo);
752 spin_unlock(&glob->lru_lock);
756 kref_get(&bo->list_kref);
758 if (!list_empty(&bo->ddestroy)) {
759 ret = ttm_bo_cleanup_refs_and_unlock(bo, interruptible,
761 kref_put(&bo->list_kref, ttm_bo_release_list);
765 put_count = ttm_bo_del_from_lru(bo);
766 spin_unlock(&glob->lru_lock);
770 ttm_bo_list_ref_sub(bo, put_count, true);
772 ret = ttm_bo_evict(bo, interruptible, no_wait_gpu);
773 ttm_bo_unreserve(bo);
775 kref_put(&bo->list_kref, ttm_bo_release_list);
779 void ttm_bo_mem_put(struct ttm_buffer_object *bo, struct ttm_mem_reg *mem)
781 struct ttm_mem_type_manager *man = &bo->bdev->man[mem->mem_type];
784 (*man->func->put_node)(man, mem);
786 EXPORT_SYMBOL(ttm_bo_mem_put);
789 * Add the last move fence to the BO and reserve a new shared slot.
791 static int ttm_bo_add_move_fence(struct ttm_buffer_object *bo,
792 struct ttm_mem_type_manager *man,
793 struct ttm_mem_reg *mem)
798 spin_lock(&man->move_lock);
799 fence = fence_get(man->move);
800 spin_unlock(&man->move_lock);
803 reservation_object_add_shared_fence(bo->resv, fence);
805 ret = reservation_object_reserve_shared(bo->resv);
809 fence_put(bo->moving);
817 * Repeatedly evict memory from the LRU for @mem_type until we create enough
818 * space, or we've evicted everything and there isn't enough space.
820 static int ttm_bo_mem_force_space(struct ttm_buffer_object *bo,
822 const struct ttm_place *place,
823 struct ttm_mem_reg *mem,
827 struct ttm_bo_device *bdev = bo->bdev;
828 struct ttm_mem_type_manager *man = &bdev->man[mem_type];
832 ret = (*man->func->get_node)(man, bo, place, mem);
833 if (unlikely(ret != 0))
837 ret = ttm_mem_evict_first(bdev, mem_type, place,
838 interruptible, no_wait_gpu);
839 if (unlikely(ret != 0))
842 mem->mem_type = mem_type;
843 return ttm_bo_add_move_fence(bo, man, mem);
846 static uint32_t ttm_bo_select_caching(struct ttm_mem_type_manager *man,
847 uint32_t cur_placement,
848 uint32_t proposed_placement)
850 uint32_t caching = proposed_placement & TTM_PL_MASK_CACHING;
851 uint32_t result = proposed_placement & ~TTM_PL_MASK_CACHING;
854 * Keep current caching if possible.
857 if ((cur_placement & caching) != 0)
858 result |= (cur_placement & caching);
859 else if ((man->default_caching & caching) != 0)
860 result |= man->default_caching;
861 else if ((TTM_PL_FLAG_CACHED & caching) != 0)
862 result |= TTM_PL_FLAG_CACHED;
863 else if ((TTM_PL_FLAG_WC & caching) != 0)
864 result |= TTM_PL_FLAG_WC;
865 else if ((TTM_PL_FLAG_UNCACHED & caching) != 0)
866 result |= TTM_PL_FLAG_UNCACHED;
871 static bool ttm_bo_mt_compatible(struct ttm_mem_type_manager *man,
873 const struct ttm_place *place,
874 uint32_t *masked_placement)
876 uint32_t cur_flags = ttm_bo_type_flags(mem_type);
878 if ((cur_flags & place->flags & TTM_PL_MASK_MEM) == 0)
881 if ((place->flags & man->available_caching) == 0)
884 cur_flags |= (place->flags & man->available_caching);
886 *masked_placement = cur_flags;
891 * Creates space for memory region @mem according to its type.
893 * This function first searches for free space in compatible memory types in
894 * the priority order defined by the driver. If free space isn't found, then
895 * ttm_bo_mem_force_space is attempted in priority order to evict and find
898 int ttm_bo_mem_space(struct ttm_buffer_object *bo,
899 struct ttm_placement *placement,
900 struct ttm_mem_reg *mem,
904 struct ttm_bo_device *bdev = bo->bdev;
905 struct ttm_mem_type_manager *man;
906 uint32_t mem_type = TTM_PL_SYSTEM;
907 uint32_t cur_flags = 0;
908 bool type_found = false;
909 bool type_ok = false;
910 bool has_erestartsys = false;
913 ret = reservation_object_reserve_shared(bo->resv);
918 for (i = 0; i < placement->num_placement; ++i) {
919 const struct ttm_place *place = &placement->placement[i];
921 ret = ttm_mem_type_from_place(place, &mem_type);
924 man = &bdev->man[mem_type];
925 if (!man->has_type || !man->use_type)
928 type_ok = ttm_bo_mt_compatible(man, mem_type, place,
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)
947 ret = (*man->func->get_node)(man, bo, place, mem);
952 ret = ttm_bo_add_move_fence(bo, man, mem);
954 (*man->func->put_node)(man, mem);
961 if ((type_ok && (mem_type == TTM_PL_SYSTEM)) || mem->mm_node) {
962 mem->mem_type = mem_type;
963 mem->placement = cur_flags;
967 for (i = 0; i < placement->num_busy_placement; ++i) {
968 const struct ttm_place *place = &placement->busy_placement[i];
970 ret = ttm_mem_type_from_place(place, &mem_type);
973 man = &bdev->man[mem_type];
974 if (!man->has_type || !man->use_type)
976 if (!ttm_bo_mt_compatible(man, mem_type, place, &cur_flags))
980 cur_flags = ttm_bo_select_caching(man, bo->mem.placement,
983 * Use the access and other non-mapping-related flag bits from
984 * the memory placement flags to the current flags
986 ttm_flag_masked(&cur_flags, place->flags,
987 ~TTM_PL_MASK_MEMTYPE);
989 if (mem_type == TTM_PL_SYSTEM) {
990 mem->mem_type = mem_type;
991 mem->placement = cur_flags;
996 ret = ttm_bo_mem_force_space(bo, mem_type, place, mem,
997 interruptible, no_wait_gpu);
998 if (ret == 0 && mem->mm_node) {
999 mem->placement = cur_flags;
1002 if (ret == -ERESTARTSYS)
1003 has_erestartsys = true;
1007 printk(KERN_ERR TTM_PFX "No compatible memory type found.\n");
1011 return (has_erestartsys) ? -ERESTARTSYS : -ENOMEM;
1013 EXPORT_SYMBOL(ttm_bo_mem_space);
1015 static int ttm_bo_move_buffer(struct ttm_buffer_object *bo,
1016 struct ttm_placement *placement,
1021 struct ttm_mem_reg mem;
1023 lockdep_assert_held(&bo->resv->lock.base);
1025 mem.num_pages = bo->num_pages;
1026 mem.size = mem.num_pages << PAGE_SHIFT;
1027 mem.page_alignment = bo->mem.page_alignment;
1028 mem.bus.io_reserved_vm = false;
1029 mem.bus.io_reserved_count = 0;
1031 * Determine where to move the buffer.
1033 ret = ttm_bo_mem_space(bo, placement, &mem,
1034 interruptible, no_wait_gpu);
1037 ret = ttm_bo_handle_move_mem(bo, &mem, false,
1038 interruptible, no_wait_gpu);
1040 if (ret && mem.mm_node)
1041 ttm_bo_mem_put(bo, &mem);
1045 bool ttm_bo_mem_compat(struct ttm_placement *placement,
1046 struct ttm_mem_reg *mem,
1047 uint32_t *new_flags)
1051 for (i = 0; i < placement->num_placement; i++) {
1052 const struct ttm_place *heap = &placement->placement[i];
1054 (mem->start < heap->fpfn ||
1055 (heap->lpfn != 0 && (mem->start + mem->num_pages) > heap->lpfn)))
1058 *new_flags = heap->flags;
1059 if ((*new_flags & mem->placement & TTM_PL_MASK_CACHING) &&
1060 (*new_flags & mem->placement & TTM_PL_MASK_MEM))
1064 for (i = 0; i < placement->num_busy_placement; i++) {
1065 const struct ttm_place *heap = &placement->busy_placement[i];
1067 (mem->start < heap->fpfn ||
1068 (heap->lpfn != 0 && (mem->start + mem->num_pages) > heap->lpfn)))
1071 *new_flags = heap->flags;
1072 if ((*new_flags & mem->placement & TTM_PL_MASK_CACHING) &&
1073 (*new_flags & mem->placement & TTM_PL_MASK_MEM))
1079 EXPORT_SYMBOL(ttm_bo_mem_compat);
1081 int ttm_bo_validate(struct ttm_buffer_object *bo,
1082 struct ttm_placement *placement,
1089 lockdep_assert_held(&bo->resv->lock.base);
1091 * Check whether we need to move buffer.
1093 if (!ttm_bo_mem_compat(placement, &bo->mem, &new_flags)) {
1094 ret = ttm_bo_move_buffer(bo, placement, interruptible,
1100 * Use the access and other non-mapping-related flag bits from
1101 * the compatible memory placement flags to the active flags
1103 ttm_flag_masked(&bo->mem.placement, new_flags,
1104 ~TTM_PL_MASK_MEMTYPE);
1107 * We might need to add a TTM.
1109 if (bo->mem.mem_type == TTM_PL_SYSTEM && bo->ttm == NULL) {
1110 ret = ttm_bo_add_ttm(bo, true);
1116 EXPORT_SYMBOL(ttm_bo_validate);
1118 int ttm_bo_init(struct ttm_bo_device *bdev,
1119 struct ttm_buffer_object *bo,
1121 enum ttm_bo_type type,
1122 struct ttm_placement *placement,
1123 uint32_t page_alignment,
1125 struct file *persistent_swap_storage,
1127 struct sg_table *sg,
1128 struct reservation_object *resv,
1129 void (*destroy) (struct ttm_buffer_object *))
1132 unsigned long num_pages;
1133 struct ttm_mem_global *mem_glob = bdev->glob->mem_glob;
1136 ret = ttm_mem_global_alloc(mem_glob, acc_size, false, false);
1138 pr_err("Out of kernel memory\n");
1146 num_pages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
1147 if (num_pages == 0) {
1148 pr_err("Illegal buffer object size\n");
1153 ttm_mem_global_free(mem_glob, acc_size);
1156 bo->destroy = destroy;
1158 kref_init(&bo->kref);
1159 kref_init(&bo->list_kref);
1160 atomic_set(&bo->cpu_writers, 0);
1161 INIT_LIST_HEAD(&bo->lru);
1162 INIT_LIST_HEAD(&bo->ddestroy);
1163 INIT_LIST_HEAD(&bo->swap);
1164 INIT_LIST_HEAD(&bo->io_reserve_lru);
1165 mutex_init(&bo->wu_mutex);
1167 bo->glob = bdev->glob;
1169 bo->num_pages = num_pages;
1170 bo->mem.size = num_pages << PAGE_SHIFT;
1171 bo->mem.mem_type = TTM_PL_SYSTEM;
1172 bo->mem.num_pages = bo->num_pages;
1173 bo->mem.mm_node = NULL;
1174 bo->mem.page_alignment = page_alignment;
1175 bo->mem.bus.io_reserved_vm = false;
1176 bo->mem.bus.io_reserved_count = 0;
1178 bo->mem.placement = (TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED);
1179 bo->persistent_swap_storage = persistent_swap_storage;
1180 bo->acc_size = acc_size;
1184 lockdep_assert_held(&bo->resv->lock.base);
1186 bo->resv = &bo->ttm_resv;
1187 reservation_object_init(&bo->ttm_resv);
1189 atomic_inc(&bo->glob->bo_count);
1190 drm_vma_node_reset(&bo->vma_node);
1193 * For ttm_bo_type_device buffers, allocate
1194 * address space from the device.
1196 if (bo->type == ttm_bo_type_device ||
1197 bo->type == ttm_bo_type_sg)
1198 ret = drm_vma_offset_add(&bdev->vma_manager, &bo->vma_node,
1201 /* passed reservation objects should already be locked,
1202 * since otherwise lockdep will be angered in radeon.
1205 locked = ww_mutex_trylock(&bo->resv->lock);
1210 ret = ttm_bo_validate(bo, placement, interruptible, false);
1213 ttm_bo_unreserve(bo);
1215 } else if (!(bo->mem.placement & TTM_PL_FLAG_NO_EVICT)) {
1216 spin_lock(&bo->glob->lru_lock);
1217 ttm_bo_add_to_lru(bo);
1218 spin_unlock(&bo->glob->lru_lock);
1226 EXPORT_SYMBOL(ttm_bo_init);
1228 size_t ttm_bo_acc_size(struct ttm_bo_device *bdev,
1229 unsigned long bo_size,
1230 unsigned struct_size)
1232 unsigned npages = (PAGE_ALIGN(bo_size)) >> PAGE_SHIFT;
1235 size += ttm_round_pot(struct_size);
1236 size += ttm_round_pot(npages * sizeof(void *));
1237 size += ttm_round_pot(sizeof(struct ttm_tt));
1240 EXPORT_SYMBOL(ttm_bo_acc_size);
1242 size_t ttm_bo_dma_acc_size(struct ttm_bo_device *bdev,
1243 unsigned long bo_size,
1244 unsigned struct_size)
1246 unsigned npages = (PAGE_ALIGN(bo_size)) >> PAGE_SHIFT;
1249 size += ttm_round_pot(struct_size);
1250 size += ttm_round_pot(npages * (2*sizeof(void *) + sizeof(dma_addr_t)));
1251 size += ttm_round_pot(sizeof(struct ttm_dma_tt));
1254 EXPORT_SYMBOL(ttm_bo_dma_acc_size);
1256 int ttm_bo_create(struct ttm_bo_device *bdev,
1258 enum ttm_bo_type type,
1259 struct ttm_placement *placement,
1260 uint32_t page_alignment,
1262 struct file *persistent_swap_storage,
1263 struct ttm_buffer_object **p_bo)
1265 struct ttm_buffer_object *bo;
1269 bo = kzalloc(sizeof(*bo), GFP_KERNEL);
1270 if (unlikely(bo == NULL))
1273 acc_size = ttm_bo_acc_size(bdev, size, sizeof(struct ttm_buffer_object));
1274 ret = ttm_bo_init(bdev, bo, size, type, placement, page_alignment,
1275 interruptible, persistent_swap_storage, acc_size,
1277 if (likely(ret == 0))
1282 EXPORT_SYMBOL(ttm_bo_create);
1284 static int ttm_bo_force_list_clean(struct ttm_bo_device *bdev,
1285 unsigned mem_type, bool allow_errors)
1287 struct ttm_mem_type_manager *man = &bdev->man[mem_type];
1288 struct ttm_bo_global *glob = bdev->glob;
1289 struct fence *fence;
1293 * Can't use standard list traversal since we're unlocking.
1296 spin_lock(&glob->lru_lock);
1297 while (!list_empty(&man->lru)) {
1298 spin_unlock(&glob->lru_lock);
1299 ret = ttm_mem_evict_first(bdev, mem_type, NULL, false, false);
1304 pr_err("Cleanup eviction failed\n");
1307 spin_lock(&glob->lru_lock);
1309 spin_unlock(&glob->lru_lock);
1311 spin_lock(&man->move_lock);
1312 fence = fence_get(man->move);
1313 spin_unlock(&man->move_lock);
1316 ret = fence_wait(fence, false);
1322 pr_err("Cleanup eviction failed\n");
1330 int ttm_bo_clean_mm(struct ttm_bo_device *bdev, unsigned mem_type)
1332 struct ttm_mem_type_manager *man;
1335 if (mem_type >= TTM_NUM_MEM_TYPES) {
1336 pr_err("Illegal memory type %d\n", mem_type);
1339 man = &bdev->man[mem_type];
1341 if (!man->has_type) {
1342 pr_err("Trying to take down uninitialized memory manager type %u\n",
1346 fence_put(man->move);
1348 man->use_type = false;
1349 man->has_type = false;
1353 ttm_bo_force_list_clean(bdev, mem_type, false);
1355 ret = (*man->func->takedown)(man);
1360 EXPORT_SYMBOL(ttm_bo_clean_mm);
1362 int ttm_bo_evict_mm(struct ttm_bo_device *bdev, unsigned mem_type)
1364 struct ttm_mem_type_manager *man = &bdev->man[mem_type];
1366 if (mem_type == 0 || mem_type >= TTM_NUM_MEM_TYPES) {
1367 pr_err("Illegal memory manager memory type %u\n", mem_type);
1371 if (!man->has_type) {
1372 pr_err("Memory type %u has not been initialized\n", mem_type);
1376 return ttm_bo_force_list_clean(bdev, mem_type, true);
1378 EXPORT_SYMBOL(ttm_bo_evict_mm);
1380 int ttm_bo_init_mm(struct ttm_bo_device *bdev, unsigned type,
1381 unsigned long p_size)
1384 struct ttm_mem_type_manager *man;
1386 BUG_ON(type >= TTM_NUM_MEM_TYPES);
1387 man = &bdev->man[type];
1388 BUG_ON(man->has_type);
1389 man->io_reserve_fastpath = true;
1390 man->use_io_reserve_lru = false;
1391 mutex_init(&man->io_reserve_mutex);
1392 spin_lock_init(&man->move_lock);
1393 INIT_LIST_HEAD(&man->io_reserve_lru);
1395 ret = bdev->driver->init_mem_type(bdev, type, man);
1401 if (type != TTM_PL_SYSTEM) {
1402 ret = (*man->func->init)(man, p_size);
1406 man->has_type = true;
1407 man->use_type = true;
1410 INIT_LIST_HEAD(&man->lru);
1415 EXPORT_SYMBOL(ttm_bo_init_mm);
1417 static void ttm_bo_global_kobj_release(struct kobject *kobj)
1419 struct ttm_bo_global *glob =
1420 container_of(kobj, struct ttm_bo_global, kobj);
1422 ttm_mem_unregister_shrink(glob->mem_glob, &glob->shrink);
1423 __free_page(glob->dummy_read_page);
1427 void ttm_bo_global_release(struct drm_global_reference *ref)
1429 struct ttm_bo_global *glob = ref->object;
1431 kobject_del(&glob->kobj);
1432 kobject_put(&glob->kobj);
1434 EXPORT_SYMBOL(ttm_bo_global_release);
1436 int ttm_bo_global_init(struct drm_global_reference *ref)
1438 struct ttm_bo_global_ref *bo_ref =
1439 container_of(ref, struct ttm_bo_global_ref, ref);
1440 struct ttm_bo_global *glob = ref->object;
1443 mutex_init(&glob->device_list_mutex);
1444 spin_lock_init(&glob->lru_lock);
1445 glob->mem_glob = bo_ref->mem_glob;
1446 glob->dummy_read_page = alloc_page(__GFP_ZERO | GFP_DMA32);
1448 if (unlikely(glob->dummy_read_page == NULL)) {
1453 INIT_LIST_HEAD(&glob->swap_lru);
1454 INIT_LIST_HEAD(&glob->device_list);
1456 ttm_mem_init_shrink(&glob->shrink, ttm_bo_swapout);
1457 ret = ttm_mem_register_shrink(glob->mem_glob, &glob->shrink);
1458 if (unlikely(ret != 0)) {
1459 pr_err("Could not register buffer object swapout\n");
1463 atomic_set(&glob->bo_count, 0);
1465 ret = kobject_init_and_add(
1466 &glob->kobj, &ttm_bo_glob_kobj_type, ttm_get_kobj(), "buffer_objects");
1467 if (unlikely(ret != 0))
1468 kobject_put(&glob->kobj);
1471 __free_page(glob->dummy_read_page);
1476 EXPORT_SYMBOL(ttm_bo_global_init);
1479 int ttm_bo_device_release(struct ttm_bo_device *bdev)
1482 unsigned i = TTM_NUM_MEM_TYPES;
1483 struct ttm_mem_type_manager *man;
1484 struct ttm_bo_global *glob = bdev->glob;
1487 man = &bdev->man[i];
1488 if (man->has_type) {
1489 man->use_type = false;
1490 if ((i != TTM_PL_SYSTEM) && ttm_bo_clean_mm(bdev, i)) {
1492 pr_err("DRM memory manager type %d is not clean\n",
1495 man->has_type = false;
1499 mutex_lock(&glob->device_list_mutex);
1500 list_del(&bdev->device_list);
1501 mutex_unlock(&glob->device_list_mutex);
1503 cancel_delayed_work_sync(&bdev->wq);
1505 while (ttm_bo_delayed_delete(bdev, true))
1508 spin_lock(&glob->lru_lock);
1509 if (list_empty(&bdev->ddestroy))
1510 TTM_DEBUG("Delayed destroy list was clean\n");
1512 if (list_empty(&bdev->man[0].lru))
1513 TTM_DEBUG("Swap list was clean\n");
1514 spin_unlock(&glob->lru_lock);
1516 drm_vma_offset_manager_destroy(&bdev->vma_manager);
1520 EXPORT_SYMBOL(ttm_bo_device_release);
1522 int ttm_bo_device_init(struct ttm_bo_device *bdev,
1523 struct ttm_bo_global *glob,
1524 struct ttm_bo_driver *driver,
1525 struct address_space *mapping,
1526 uint64_t file_page_offset,
1531 bdev->driver = driver;
1533 memset(bdev->man, 0, sizeof(bdev->man));
1536 * Initialize the system memory buffer type.
1537 * Other types need to be driver / IOCTL initialized.
1539 ret = ttm_bo_init_mm(bdev, TTM_PL_SYSTEM, 0);
1540 if (unlikely(ret != 0))
1543 drm_vma_offset_manager_init(&bdev->vma_manager, file_page_offset,
1545 INIT_DELAYED_WORK(&bdev->wq, ttm_bo_delayed_workqueue);
1546 INIT_LIST_HEAD(&bdev->ddestroy);
1547 bdev->dev_mapping = mapping;
1549 bdev->need_dma32 = need_dma32;
1550 mutex_lock(&glob->device_list_mutex);
1551 list_add_tail(&bdev->device_list, &glob->device_list);
1552 mutex_unlock(&glob->device_list_mutex);
1558 EXPORT_SYMBOL(ttm_bo_device_init);
1561 * buffer object vm functions.
1564 bool ttm_mem_reg_is_pci(struct ttm_bo_device *bdev, struct ttm_mem_reg *mem)
1566 struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
1568 if (!(man->flags & TTM_MEMTYPE_FLAG_FIXED)) {
1569 if (mem->mem_type == TTM_PL_SYSTEM)
1572 if (man->flags & TTM_MEMTYPE_FLAG_CMA)
1575 if (mem->placement & TTM_PL_FLAG_CACHED)
1581 void ttm_bo_unmap_virtual_locked(struct ttm_buffer_object *bo)
1583 struct ttm_bo_device *bdev = bo->bdev;
1585 drm_vma_node_unmap(&bo->vma_node, bdev->dev_mapping);
1586 ttm_mem_io_free_vm(bo);
1589 void ttm_bo_unmap_virtual(struct ttm_buffer_object *bo)
1591 struct ttm_bo_device *bdev = bo->bdev;
1592 struct ttm_mem_type_manager *man = &bdev->man[bo->mem.mem_type];
1594 ttm_mem_io_lock(man, false);
1595 ttm_bo_unmap_virtual_locked(bo);
1596 ttm_mem_io_unlock(man);
1600 EXPORT_SYMBOL(ttm_bo_unmap_virtual);
1602 int ttm_bo_wait(struct ttm_buffer_object *bo,
1603 bool interruptible, bool no_wait)
1605 long timeout = no_wait ? 0 : 15 * HZ;
1607 timeout = reservation_object_wait_timeout_rcu(bo->resv, true,
1608 interruptible, timeout);
1615 reservation_object_add_excl_fence(bo->resv, NULL);
1618 EXPORT_SYMBOL(ttm_bo_wait);
1620 int ttm_bo_synccpu_write_grab(struct ttm_buffer_object *bo, bool no_wait)
1625 * Using ttm_bo_reserve makes sure the lru lists are updated.
1628 ret = ttm_bo_reserve(bo, true, no_wait, NULL);
1629 if (unlikely(ret != 0))
1631 ret = ttm_bo_wait(bo, true, no_wait);
1632 if (likely(ret == 0))
1633 atomic_inc(&bo->cpu_writers);
1634 ttm_bo_unreserve(bo);
1637 EXPORT_SYMBOL(ttm_bo_synccpu_write_grab);
1639 void ttm_bo_synccpu_write_release(struct ttm_buffer_object *bo)
1641 atomic_dec(&bo->cpu_writers);
1643 EXPORT_SYMBOL(ttm_bo_synccpu_write_release);
1646 * A buffer object shrink method that tries to swap out the first
1647 * buffer object on the bo_global::swap_lru list.
1650 static int ttm_bo_swapout(struct ttm_mem_shrink *shrink)
1652 struct ttm_bo_global *glob =
1653 container_of(shrink, struct ttm_bo_global, shrink);
1654 struct ttm_buffer_object *bo;
1657 uint32_t swap_placement = (TTM_PL_FLAG_CACHED | TTM_PL_FLAG_SYSTEM);
1659 spin_lock(&glob->lru_lock);
1660 list_for_each_entry(bo, &glob->swap_lru, swap) {
1661 ret = __ttm_bo_reserve(bo, false, true, NULL);
1667 spin_unlock(&glob->lru_lock);
1671 kref_get(&bo->list_kref);
1673 if (!list_empty(&bo->ddestroy)) {
1674 ret = ttm_bo_cleanup_refs_and_unlock(bo, false, false);
1675 kref_put(&bo->list_kref, ttm_bo_release_list);
1679 put_count = ttm_bo_del_from_lru(bo);
1680 spin_unlock(&glob->lru_lock);
1682 ttm_bo_list_ref_sub(bo, put_count, true);
1685 * Move to system cached
1688 if ((bo->mem.placement & swap_placement) != swap_placement) {
1689 struct ttm_mem_reg evict_mem;
1691 evict_mem = bo->mem;
1692 evict_mem.mm_node = NULL;
1693 evict_mem.placement = TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED;
1694 evict_mem.mem_type = TTM_PL_SYSTEM;
1696 ret = ttm_bo_handle_move_mem(bo, &evict_mem, true,
1698 if (unlikely(ret != 0))
1703 * Make sure BO is idle.
1706 ret = ttm_bo_wait(bo, false, false);
1707 if (unlikely(ret != 0))
1710 ttm_bo_unmap_virtual(bo);
1713 * Swap out. Buffer will be swapped in again as soon as
1714 * anyone tries to access a ttm page.
1717 if (bo->bdev->driver->swap_notify)
1718 bo->bdev->driver->swap_notify(bo);
1720 ret = ttm_tt_swapout(bo->ttm, bo->persistent_swap_storage);
1725 * Unreserve without putting on LRU to avoid swapping out an
1726 * already swapped buffer.
1729 __ttm_bo_unreserve(bo);
1730 kref_put(&bo->list_kref, ttm_bo_release_list);
1734 void ttm_bo_swapout_all(struct ttm_bo_device *bdev)
1736 while (ttm_bo_swapout(&bdev->glob->shrink) == 0)
1739 EXPORT_SYMBOL(ttm_bo_swapout_all);
1742 * ttm_bo_wait_unreserved - interruptible wait for a buffer object to become
1745 * @bo: Pointer to buffer
1747 int ttm_bo_wait_unreserved(struct ttm_buffer_object *bo)
1752 * In the absense of a wait_unlocked API,
1753 * Use the bo::wu_mutex to avoid triggering livelocks due to
1754 * concurrent use of this function. Note that this use of
1755 * bo::wu_mutex can go away if we change locking order to
1756 * mmap_sem -> bo::reserve.
1758 ret = mutex_lock_interruptible(&bo->wu_mutex);
1759 if (unlikely(ret != 0))
1760 return -ERESTARTSYS;
1761 if (!ww_mutex_is_locked(&bo->resv->lock))
1763 ret = __ttm_bo_reserve(bo, true, false, NULL);
1764 if (unlikely(ret != 0))
1766 __ttm_bo_unreserve(bo);
1769 mutex_unlock(&bo->wu_mutex);