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 ret = bdev->driver->invalidate_caches(bdev, bo->mem.placement);
356 pr_err("Can not flush read caches\n");
360 if (bo->mem.mm_node) {
361 bo->offset = (bo->mem.start << PAGE_SHIFT) +
362 bdev->man[bo->mem.mem_type].gpu_offset;
363 bo->cur_placement = bo->mem.placement;
370 new_man = &bdev->man[bo->mem.mem_type];
371 if ((new_man->flags & TTM_MEMTYPE_FLAG_FIXED) && bo->ttm) {
372 ttm_tt_unbind(bo->ttm);
373 ttm_tt_destroy(bo->ttm);
382 * Will release GPU memory type usage on destruction.
383 * This is the place to put in driver specific hooks to release
384 * driver private resources.
385 * Will release the bo::reserved lock.
388 static void ttm_bo_cleanup_memtype_use(struct ttm_buffer_object *bo)
390 if (bo->bdev->driver->move_notify)
391 bo->bdev->driver->move_notify(bo, NULL);
394 ttm_tt_unbind(bo->ttm);
395 ttm_tt_destroy(bo->ttm);
398 ttm_bo_mem_put(bo, &bo->mem);
400 ww_mutex_unlock (&bo->resv->lock);
403 static void ttm_bo_cleanup_refs_or_queue(struct ttm_buffer_object *bo)
405 struct ttm_bo_device *bdev = bo->bdev;
406 struct ttm_bo_global *glob = bo->glob;
407 struct ttm_bo_driver *driver = bdev->driver;
408 void *sync_obj = NULL;
412 spin_lock(&glob->lru_lock);
413 ret = ttm_bo_reserve_nolru(bo, false, true, false, 0);
415 spin_lock(&bdev->fence_lock);
416 (void) ttm_bo_wait(bo, false, false, true);
417 if (!ret && !bo->sync_obj) {
418 spin_unlock(&bdev->fence_lock);
419 put_count = ttm_bo_del_from_lru(bo);
421 spin_unlock(&glob->lru_lock);
422 ttm_bo_cleanup_memtype_use(bo);
424 ttm_bo_list_ref_sub(bo, put_count, true);
429 sync_obj = driver->sync_obj_ref(bo->sync_obj);
430 spin_unlock(&bdev->fence_lock);
435 * Make NO_EVICT bos immediately available to
436 * shrinkers, now that they are queued for
439 if (bo->mem.placement & TTM_PL_FLAG_NO_EVICT) {
440 bo->mem.placement &= ~TTM_PL_FLAG_NO_EVICT;
441 ttm_bo_add_to_lru(bo);
444 ww_mutex_unlock(&bo->resv->lock);
447 kref_get(&bo->list_kref);
448 list_add_tail(&bo->ddestroy, &bdev->ddestroy);
449 spin_unlock(&glob->lru_lock);
452 driver->sync_obj_flush(sync_obj);
453 driver->sync_obj_unref(&sync_obj);
455 schedule_delayed_work(&bdev->wq,
456 ((HZ / 100) < 1) ? 1 : HZ / 100);
460 * function ttm_bo_cleanup_refs_and_unlock
461 * If bo idle, remove from delayed- and lru lists, and unref.
462 * If not idle, do nothing.
464 * Must be called with lru_lock and reservation held, this function
465 * will drop both before returning.
467 * @interruptible Any sleeps should occur interruptibly.
468 * @no_wait_gpu Never wait for gpu. Return -EBUSY instead.
471 static int ttm_bo_cleanup_refs_and_unlock(struct ttm_buffer_object *bo,
475 struct ttm_bo_device *bdev = bo->bdev;
476 struct ttm_bo_driver *driver = bdev->driver;
477 struct ttm_bo_global *glob = bo->glob;
481 spin_lock(&bdev->fence_lock);
482 ret = ttm_bo_wait(bo, false, false, true);
484 if (ret && !no_wait_gpu) {
488 * Take a reference to the fence and unreserve,
489 * at this point the buffer should be dead, so
490 * no new sync objects can be attached.
492 sync_obj = driver->sync_obj_ref(bo->sync_obj);
493 spin_unlock(&bdev->fence_lock);
495 ww_mutex_unlock(&bo->resv->lock);
496 spin_unlock(&glob->lru_lock);
498 ret = driver->sync_obj_wait(sync_obj, false, interruptible);
499 driver->sync_obj_unref(&sync_obj);
504 * remove sync_obj with ttm_bo_wait, the wait should be
505 * finished, and no new wait object should have been added.
507 spin_lock(&bdev->fence_lock);
508 ret = ttm_bo_wait(bo, false, false, true);
510 spin_unlock(&bdev->fence_lock);
514 spin_lock(&glob->lru_lock);
515 ret = ttm_bo_reserve_nolru(bo, false, true, false, 0);
518 * We raced, and lost, someone else holds the reservation now,
519 * and is probably busy in ttm_bo_cleanup_memtype_use.
521 * Even if it's not the case, because we finished waiting any
522 * delayed destruction would succeed, so just return success
526 spin_unlock(&glob->lru_lock);
530 spin_unlock(&bdev->fence_lock);
532 if (ret || unlikely(list_empty(&bo->ddestroy))) {
533 ww_mutex_unlock(&bo->resv->lock);
534 spin_unlock(&glob->lru_lock);
538 put_count = ttm_bo_del_from_lru(bo);
539 list_del_init(&bo->ddestroy);
542 spin_unlock(&glob->lru_lock);
543 ttm_bo_cleanup_memtype_use(bo);
545 ttm_bo_list_ref_sub(bo, put_count, true);
551 * Traverse the delayed list, and call ttm_bo_cleanup_refs on all
552 * encountered buffers.
555 static int ttm_bo_delayed_delete(struct ttm_bo_device *bdev, bool remove_all)
557 struct ttm_bo_global *glob = bdev->glob;
558 struct ttm_buffer_object *entry = NULL;
561 spin_lock(&glob->lru_lock);
562 if (list_empty(&bdev->ddestroy))
565 entry = list_first_entry(&bdev->ddestroy,
566 struct ttm_buffer_object, ddestroy);
567 kref_get(&entry->list_kref);
570 struct ttm_buffer_object *nentry = NULL;
572 if (entry->ddestroy.next != &bdev->ddestroy) {
573 nentry = list_first_entry(&entry->ddestroy,
574 struct ttm_buffer_object, ddestroy);
575 kref_get(&nentry->list_kref);
578 ret = ttm_bo_reserve_nolru(entry, false, true, false, 0);
579 if (remove_all && ret) {
580 spin_unlock(&glob->lru_lock);
581 ret = ttm_bo_reserve_nolru(entry, false, false,
583 spin_lock(&glob->lru_lock);
587 ret = ttm_bo_cleanup_refs_and_unlock(entry, false,
590 spin_unlock(&glob->lru_lock);
592 kref_put(&entry->list_kref, ttm_bo_release_list);
598 spin_lock(&glob->lru_lock);
599 if (list_empty(&entry->ddestroy))
604 spin_unlock(&glob->lru_lock);
607 kref_put(&entry->list_kref, ttm_bo_release_list);
611 static void ttm_bo_delayed_workqueue(struct work_struct *work)
613 struct ttm_bo_device *bdev =
614 container_of(work, struct ttm_bo_device, wq.work);
616 if (ttm_bo_delayed_delete(bdev, false)) {
617 schedule_delayed_work(&bdev->wq,
618 ((HZ / 100) < 1) ? 1 : HZ / 100);
622 static void ttm_bo_release(struct kref *kref)
624 struct ttm_buffer_object *bo =
625 container_of(kref, struct ttm_buffer_object, kref);
626 struct ttm_bo_device *bdev = bo->bdev;
627 struct ttm_mem_type_manager *man = &bdev->man[bo->mem.mem_type];
629 drm_vma_offset_remove(&bdev->vma_manager, &bo->vma_node);
630 ttm_mem_io_lock(man, false);
631 ttm_mem_io_free_vm(bo);
632 ttm_mem_io_unlock(man);
633 ttm_bo_cleanup_refs_or_queue(bo);
634 kref_put(&bo->list_kref, ttm_bo_release_list);
637 void ttm_bo_unref(struct ttm_buffer_object **p_bo)
639 struct ttm_buffer_object *bo = *p_bo;
642 kref_put(&bo->kref, ttm_bo_release);
644 EXPORT_SYMBOL(ttm_bo_unref);
646 int ttm_bo_lock_delayed_workqueue(struct ttm_bo_device *bdev)
648 return cancel_delayed_work_sync(&bdev->wq);
650 EXPORT_SYMBOL(ttm_bo_lock_delayed_workqueue);
652 void ttm_bo_unlock_delayed_workqueue(struct ttm_bo_device *bdev, int resched)
655 schedule_delayed_work(&bdev->wq,
656 ((HZ / 100) < 1) ? 1 : HZ / 100);
658 EXPORT_SYMBOL(ttm_bo_unlock_delayed_workqueue);
660 static int ttm_bo_evict(struct ttm_buffer_object *bo, bool interruptible,
663 struct ttm_bo_device *bdev = bo->bdev;
664 struct ttm_mem_reg evict_mem;
665 struct ttm_placement placement;
668 spin_lock(&bdev->fence_lock);
669 ret = ttm_bo_wait(bo, false, interruptible, no_wait_gpu);
670 spin_unlock(&bdev->fence_lock);
672 if (unlikely(ret != 0)) {
673 if (ret != -ERESTARTSYS) {
674 pr_err("Failed to expire sync object before buffer eviction\n");
679 lockdep_assert_held(&bo->resv->lock.base);
682 evict_mem.mm_node = NULL;
683 evict_mem.bus.io_reserved_vm = false;
684 evict_mem.bus.io_reserved_count = 0;
688 placement.num_placement = 0;
689 placement.num_busy_placement = 0;
690 bdev->driver->evict_flags(bo, &placement);
691 ret = ttm_bo_mem_space(bo, &placement, &evict_mem, interruptible,
694 if (ret != -ERESTARTSYS) {
695 pr_err("Failed to find memory space for buffer 0x%p eviction\n",
697 ttm_bo_mem_space_debug(bo, &placement);
702 ret = ttm_bo_handle_move_mem(bo, &evict_mem, true, interruptible,
705 if (ret != -ERESTARTSYS)
706 pr_err("Buffer eviction failed\n");
707 ttm_bo_mem_put(bo, &evict_mem);
715 static int ttm_mem_evict_first(struct ttm_bo_device *bdev,
720 struct ttm_bo_global *glob = bdev->glob;
721 struct ttm_mem_type_manager *man = &bdev->man[mem_type];
722 struct ttm_buffer_object *bo;
723 int ret = -EBUSY, put_count;
725 spin_lock(&glob->lru_lock);
726 list_for_each_entry(bo, &man->lru, lru) {
727 ret = ttm_bo_reserve_nolru(bo, false, true, false, 0);
733 spin_unlock(&glob->lru_lock);
737 kref_get(&bo->list_kref);
739 if (!list_empty(&bo->ddestroy)) {
740 ret = ttm_bo_cleanup_refs_and_unlock(bo, interruptible,
742 kref_put(&bo->list_kref, ttm_bo_release_list);
746 put_count = ttm_bo_del_from_lru(bo);
747 spin_unlock(&glob->lru_lock);
751 ttm_bo_list_ref_sub(bo, put_count, true);
753 ret = ttm_bo_evict(bo, interruptible, no_wait_gpu);
754 ttm_bo_unreserve(bo);
756 kref_put(&bo->list_kref, ttm_bo_release_list);
760 void ttm_bo_mem_put(struct ttm_buffer_object *bo, struct ttm_mem_reg *mem)
762 struct ttm_mem_type_manager *man = &bo->bdev->man[mem->mem_type];
765 (*man->func->put_node)(man, mem);
767 EXPORT_SYMBOL(ttm_bo_mem_put);
770 * Repeatedly evict memory from the LRU for @mem_type until we create enough
771 * space, or we've evicted everything and there isn't enough space.
773 static int ttm_bo_mem_force_space(struct ttm_buffer_object *bo,
775 struct ttm_placement *placement,
776 struct ttm_mem_reg *mem,
780 struct ttm_bo_device *bdev = bo->bdev;
781 struct ttm_mem_type_manager *man = &bdev->man[mem_type];
785 ret = (*man->func->get_node)(man, bo, placement, mem);
786 if (unlikely(ret != 0))
790 ret = ttm_mem_evict_first(bdev, mem_type,
791 interruptible, no_wait_gpu);
792 if (unlikely(ret != 0))
795 if (mem->mm_node == NULL)
797 mem->mem_type = mem_type;
801 static uint32_t ttm_bo_select_caching(struct ttm_mem_type_manager *man,
802 uint32_t cur_placement,
803 uint32_t proposed_placement)
805 uint32_t caching = proposed_placement & TTM_PL_MASK_CACHING;
806 uint32_t result = proposed_placement & ~TTM_PL_MASK_CACHING;
809 * Keep current caching if possible.
812 if ((cur_placement & caching) != 0)
813 result |= (cur_placement & caching);
814 else if ((man->default_caching & caching) != 0)
815 result |= man->default_caching;
816 else if ((TTM_PL_FLAG_CACHED & caching) != 0)
817 result |= TTM_PL_FLAG_CACHED;
818 else if ((TTM_PL_FLAG_WC & caching) != 0)
819 result |= TTM_PL_FLAG_WC;
820 else if ((TTM_PL_FLAG_UNCACHED & caching) != 0)
821 result |= TTM_PL_FLAG_UNCACHED;
826 static bool ttm_bo_mt_compatible(struct ttm_mem_type_manager *man,
828 uint32_t proposed_placement,
829 uint32_t *masked_placement)
831 uint32_t cur_flags = ttm_bo_type_flags(mem_type);
833 if ((cur_flags & proposed_placement & TTM_PL_MASK_MEM) == 0)
836 if ((proposed_placement & man->available_caching) == 0)
839 cur_flags |= (proposed_placement & man->available_caching);
841 *masked_placement = cur_flags;
846 * Creates space for memory region @mem according to its type.
848 * This function first searches for free space in compatible memory types in
849 * the priority order defined by the driver. If free space isn't found, then
850 * ttm_bo_mem_force_space is attempted in priority order to evict and find
853 int ttm_bo_mem_space(struct ttm_buffer_object *bo,
854 struct ttm_placement *placement,
855 struct ttm_mem_reg *mem,
859 struct ttm_bo_device *bdev = bo->bdev;
860 struct ttm_mem_type_manager *man;
861 uint32_t mem_type = TTM_PL_SYSTEM;
862 uint32_t cur_flags = 0;
863 bool type_found = false;
864 bool type_ok = false;
865 bool has_erestartsys = false;
869 for (i = 0; i < placement->num_placement; ++i) {
870 ret = ttm_mem_type_from_flags(placement->placement[i],
874 man = &bdev->man[mem_type];
876 type_ok = ttm_bo_mt_compatible(man,
878 placement->placement[i],
884 cur_flags = ttm_bo_select_caching(man, bo->mem.placement,
887 * Use the access and other non-mapping-related flag bits from
888 * the memory placement flags to the current flags
890 ttm_flag_masked(&cur_flags, placement->placement[i],
891 ~TTM_PL_MASK_MEMTYPE);
893 if (mem_type == TTM_PL_SYSTEM)
896 if (man->has_type && man->use_type) {
898 ret = (*man->func->get_node)(man, bo, placement, mem);
906 if ((type_ok && (mem_type == TTM_PL_SYSTEM)) || mem->mm_node) {
907 mem->mem_type = mem_type;
908 mem->placement = cur_flags;
915 for (i = 0; i < placement->num_busy_placement; ++i) {
916 ret = ttm_mem_type_from_flags(placement->busy_placement[i],
920 man = &bdev->man[mem_type];
923 if (!ttm_bo_mt_compatible(man,
925 placement->busy_placement[i],
929 cur_flags = ttm_bo_select_caching(man, bo->mem.placement,
932 * Use the access and other non-mapping-related flag bits from
933 * the memory placement flags to the current flags
935 ttm_flag_masked(&cur_flags, placement->busy_placement[i],
936 ~TTM_PL_MASK_MEMTYPE);
939 if (mem_type == TTM_PL_SYSTEM) {
940 mem->mem_type = mem_type;
941 mem->placement = cur_flags;
946 ret = ttm_bo_mem_force_space(bo, mem_type, placement, mem,
947 interruptible, no_wait_gpu);
948 if (ret == 0 && mem->mm_node) {
949 mem->placement = cur_flags;
952 if (ret == -ERESTARTSYS)
953 has_erestartsys = true;
955 ret = (has_erestartsys) ? -ERESTARTSYS : -ENOMEM;
958 EXPORT_SYMBOL(ttm_bo_mem_space);
960 static int ttm_bo_move_buffer(struct ttm_buffer_object *bo,
961 struct ttm_placement *placement,
966 struct ttm_mem_reg mem;
967 struct ttm_bo_device *bdev = bo->bdev;
969 lockdep_assert_held(&bo->resv->lock.base);
972 * FIXME: It's possible to pipeline buffer moves.
973 * Have the driver move function wait for idle when necessary,
974 * instead of doing it here.
976 spin_lock(&bdev->fence_lock);
977 ret = ttm_bo_wait(bo, false, interruptible, no_wait_gpu);
978 spin_unlock(&bdev->fence_lock);
981 mem.num_pages = bo->num_pages;
982 mem.size = mem.num_pages << PAGE_SHIFT;
983 mem.page_alignment = bo->mem.page_alignment;
984 mem.bus.io_reserved_vm = false;
985 mem.bus.io_reserved_count = 0;
987 * Determine where to move the buffer.
989 ret = ttm_bo_mem_space(bo, placement, &mem,
990 interruptible, no_wait_gpu);
993 ret = ttm_bo_handle_move_mem(bo, &mem, false,
994 interruptible, no_wait_gpu);
996 if (ret && mem.mm_node)
997 ttm_bo_mem_put(bo, &mem);
1001 static bool ttm_bo_mem_compat(struct ttm_placement *placement,
1002 struct ttm_mem_reg *mem,
1003 uint32_t *new_flags)
1007 if (mem->mm_node && placement->lpfn != 0 &&
1008 (mem->start < placement->fpfn ||
1009 mem->start + mem->num_pages > placement->lpfn))
1012 for (i = 0; i < placement->num_placement; i++) {
1013 *new_flags = placement->placement[i];
1014 if ((*new_flags & mem->placement & TTM_PL_MASK_CACHING) &&
1015 (*new_flags & mem->placement & TTM_PL_MASK_MEM))
1019 for (i = 0; i < placement->num_busy_placement; i++) {
1020 *new_flags = placement->busy_placement[i];
1021 if ((*new_flags & mem->placement & TTM_PL_MASK_CACHING) &&
1022 (*new_flags & mem->placement & TTM_PL_MASK_MEM))
1029 int ttm_bo_validate(struct ttm_buffer_object *bo,
1030 struct ttm_placement *placement,
1037 lockdep_assert_held(&bo->resv->lock.base);
1038 /* Check that range is valid */
1039 if (placement->lpfn || placement->fpfn)
1040 if (placement->fpfn > placement->lpfn ||
1041 (placement->lpfn - placement->fpfn) < bo->num_pages)
1044 * Check whether we need to move buffer.
1046 if (!ttm_bo_mem_compat(placement, &bo->mem, &new_flags)) {
1047 ret = ttm_bo_move_buffer(bo, placement, interruptible,
1053 * Use the access and other non-mapping-related flag bits from
1054 * the compatible memory placement flags to the active flags
1056 ttm_flag_masked(&bo->mem.placement, new_flags,
1057 ~TTM_PL_MASK_MEMTYPE);
1060 * We might need to add a TTM.
1062 if (bo->mem.mem_type == TTM_PL_SYSTEM && bo->ttm == NULL) {
1063 ret = ttm_bo_add_ttm(bo, true);
1069 EXPORT_SYMBOL(ttm_bo_validate);
1071 int ttm_bo_check_placement(struct ttm_buffer_object *bo,
1072 struct ttm_placement *placement)
1074 BUG_ON((placement->fpfn || placement->lpfn) &&
1075 (bo->mem.num_pages > (placement->lpfn - placement->fpfn)));
1080 int ttm_bo_init(struct ttm_bo_device *bdev,
1081 struct ttm_buffer_object *bo,
1083 enum ttm_bo_type type,
1084 struct ttm_placement *placement,
1085 uint32_t page_alignment,
1087 struct file *persistent_swap_storage,
1089 struct sg_table *sg,
1090 void (*destroy) (struct ttm_buffer_object *))
1093 unsigned long num_pages;
1094 struct ttm_mem_global *mem_glob = bdev->glob->mem_glob;
1097 ret = ttm_mem_global_alloc(mem_glob, acc_size, false, false);
1099 pr_err("Out of kernel memory\n");
1107 num_pages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
1108 if (num_pages == 0) {
1109 pr_err("Illegal buffer object size\n");
1114 ttm_mem_global_free(mem_glob, acc_size);
1117 bo->destroy = destroy;
1119 kref_init(&bo->kref);
1120 kref_init(&bo->list_kref);
1121 atomic_set(&bo->cpu_writers, 0);
1122 INIT_LIST_HEAD(&bo->lru);
1123 INIT_LIST_HEAD(&bo->ddestroy);
1124 INIT_LIST_HEAD(&bo->swap);
1125 INIT_LIST_HEAD(&bo->io_reserve_lru);
1126 mutex_init(&bo->wu_mutex);
1128 bo->glob = bdev->glob;
1130 bo->num_pages = num_pages;
1131 bo->mem.size = num_pages << PAGE_SHIFT;
1132 bo->mem.mem_type = TTM_PL_SYSTEM;
1133 bo->mem.num_pages = bo->num_pages;
1134 bo->mem.mm_node = NULL;
1135 bo->mem.page_alignment = page_alignment;
1136 bo->mem.bus.io_reserved_vm = false;
1137 bo->mem.bus.io_reserved_count = 0;
1139 bo->mem.placement = (TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED);
1140 bo->persistent_swap_storage = persistent_swap_storage;
1141 bo->acc_size = acc_size;
1143 bo->resv = &bo->ttm_resv;
1144 reservation_object_init(bo->resv);
1145 atomic_inc(&bo->glob->bo_count);
1146 drm_vma_node_reset(&bo->vma_node);
1148 ret = ttm_bo_check_placement(bo, placement);
1151 * For ttm_bo_type_device buffers, allocate
1152 * address space from the device.
1155 (bo->type == ttm_bo_type_device ||
1156 bo->type == ttm_bo_type_sg))
1157 ret = drm_vma_offset_add(&bdev->vma_manager, &bo->vma_node,
1160 locked = ww_mutex_trylock(&bo->resv->lock);
1164 ret = ttm_bo_validate(bo, placement, interruptible, false);
1166 ttm_bo_unreserve(bo);
1173 EXPORT_SYMBOL(ttm_bo_init);
1175 size_t ttm_bo_acc_size(struct ttm_bo_device *bdev,
1176 unsigned long bo_size,
1177 unsigned struct_size)
1179 unsigned npages = (PAGE_ALIGN(bo_size)) >> PAGE_SHIFT;
1182 size += ttm_round_pot(struct_size);
1183 size += PAGE_ALIGN(npages * sizeof(void *));
1184 size += ttm_round_pot(sizeof(struct ttm_tt));
1187 EXPORT_SYMBOL(ttm_bo_acc_size);
1189 size_t ttm_bo_dma_acc_size(struct ttm_bo_device *bdev,
1190 unsigned long bo_size,
1191 unsigned struct_size)
1193 unsigned npages = (PAGE_ALIGN(bo_size)) >> PAGE_SHIFT;
1196 size += ttm_round_pot(struct_size);
1197 size += PAGE_ALIGN(npages * sizeof(void *));
1198 size += PAGE_ALIGN(npages * sizeof(dma_addr_t));
1199 size += ttm_round_pot(sizeof(struct ttm_dma_tt));
1202 EXPORT_SYMBOL(ttm_bo_dma_acc_size);
1204 int ttm_bo_create(struct ttm_bo_device *bdev,
1206 enum ttm_bo_type type,
1207 struct ttm_placement *placement,
1208 uint32_t page_alignment,
1210 struct file *persistent_swap_storage,
1211 struct ttm_buffer_object **p_bo)
1213 struct ttm_buffer_object *bo;
1217 bo = kzalloc(sizeof(*bo), GFP_KERNEL);
1218 if (unlikely(bo == NULL))
1221 acc_size = ttm_bo_acc_size(bdev, size, sizeof(struct ttm_buffer_object));
1222 ret = ttm_bo_init(bdev, bo, size, type, placement, page_alignment,
1223 interruptible, persistent_swap_storage, acc_size,
1225 if (likely(ret == 0))
1230 EXPORT_SYMBOL(ttm_bo_create);
1232 static int ttm_bo_force_list_clean(struct ttm_bo_device *bdev,
1233 unsigned mem_type, bool allow_errors)
1235 struct ttm_mem_type_manager *man = &bdev->man[mem_type];
1236 struct ttm_bo_global *glob = bdev->glob;
1240 * Can't use standard list traversal since we're unlocking.
1243 spin_lock(&glob->lru_lock);
1244 while (!list_empty(&man->lru)) {
1245 spin_unlock(&glob->lru_lock);
1246 ret = ttm_mem_evict_first(bdev, mem_type, false, false);
1251 pr_err("Cleanup eviction failed\n");
1254 spin_lock(&glob->lru_lock);
1256 spin_unlock(&glob->lru_lock);
1260 int ttm_bo_clean_mm(struct ttm_bo_device *bdev, unsigned mem_type)
1262 struct ttm_mem_type_manager *man;
1265 if (mem_type >= TTM_NUM_MEM_TYPES) {
1266 pr_err("Illegal memory type %d\n", mem_type);
1269 man = &bdev->man[mem_type];
1271 if (!man->has_type) {
1272 pr_err("Trying to take down uninitialized memory manager type %u\n",
1277 man->use_type = false;
1278 man->has_type = false;
1282 ttm_bo_force_list_clean(bdev, mem_type, false);
1284 ret = (*man->func->takedown)(man);
1289 EXPORT_SYMBOL(ttm_bo_clean_mm);
1291 int ttm_bo_evict_mm(struct ttm_bo_device *bdev, unsigned mem_type)
1293 struct ttm_mem_type_manager *man = &bdev->man[mem_type];
1295 if (mem_type == 0 || mem_type >= TTM_NUM_MEM_TYPES) {
1296 pr_err("Illegal memory manager memory type %u\n", mem_type);
1300 if (!man->has_type) {
1301 pr_err("Memory type %u has not been initialized\n", mem_type);
1305 return ttm_bo_force_list_clean(bdev, mem_type, true);
1307 EXPORT_SYMBOL(ttm_bo_evict_mm);
1309 int ttm_bo_init_mm(struct ttm_bo_device *bdev, unsigned type,
1310 unsigned long p_size)
1313 struct ttm_mem_type_manager *man;
1315 BUG_ON(type >= TTM_NUM_MEM_TYPES);
1316 man = &bdev->man[type];
1317 BUG_ON(man->has_type);
1318 man->io_reserve_fastpath = true;
1319 man->use_io_reserve_lru = false;
1320 mutex_init(&man->io_reserve_mutex);
1321 INIT_LIST_HEAD(&man->io_reserve_lru);
1323 ret = bdev->driver->init_mem_type(bdev, type, man);
1329 if (type != TTM_PL_SYSTEM) {
1330 ret = (*man->func->init)(man, p_size);
1334 man->has_type = true;
1335 man->use_type = true;
1338 INIT_LIST_HEAD(&man->lru);
1342 EXPORT_SYMBOL(ttm_bo_init_mm);
1344 static void ttm_bo_global_kobj_release(struct kobject *kobj)
1346 struct ttm_bo_global *glob =
1347 container_of(kobj, struct ttm_bo_global, kobj);
1349 ttm_mem_unregister_shrink(glob->mem_glob, &glob->shrink);
1350 __free_page(glob->dummy_read_page);
1354 void ttm_bo_global_release(struct drm_global_reference *ref)
1356 struct ttm_bo_global *glob = ref->object;
1358 kobject_del(&glob->kobj);
1359 kobject_put(&glob->kobj);
1361 EXPORT_SYMBOL(ttm_bo_global_release);
1363 int ttm_bo_global_init(struct drm_global_reference *ref)
1365 struct ttm_bo_global_ref *bo_ref =
1366 container_of(ref, struct ttm_bo_global_ref, ref);
1367 struct ttm_bo_global *glob = ref->object;
1370 mutex_init(&glob->device_list_mutex);
1371 spin_lock_init(&glob->lru_lock);
1372 glob->mem_glob = bo_ref->mem_glob;
1373 glob->dummy_read_page = alloc_page(__GFP_ZERO | GFP_DMA32);
1375 if (unlikely(glob->dummy_read_page == NULL)) {
1380 INIT_LIST_HEAD(&glob->swap_lru);
1381 INIT_LIST_HEAD(&glob->device_list);
1383 ttm_mem_init_shrink(&glob->shrink, ttm_bo_swapout);
1384 ret = ttm_mem_register_shrink(glob->mem_glob, &glob->shrink);
1385 if (unlikely(ret != 0)) {
1386 pr_err("Could not register buffer object swapout\n");
1390 atomic_set(&glob->bo_count, 0);
1392 ret = kobject_init_and_add(
1393 &glob->kobj, &ttm_bo_glob_kobj_type, ttm_get_kobj(), "buffer_objects");
1394 if (unlikely(ret != 0))
1395 kobject_put(&glob->kobj);
1398 __free_page(glob->dummy_read_page);
1403 EXPORT_SYMBOL(ttm_bo_global_init);
1406 int ttm_bo_device_release(struct ttm_bo_device *bdev)
1409 unsigned i = TTM_NUM_MEM_TYPES;
1410 struct ttm_mem_type_manager *man;
1411 struct ttm_bo_global *glob = bdev->glob;
1414 man = &bdev->man[i];
1415 if (man->has_type) {
1416 man->use_type = false;
1417 if ((i != TTM_PL_SYSTEM) && ttm_bo_clean_mm(bdev, i)) {
1419 pr_err("DRM memory manager type %d is not clean\n",
1422 man->has_type = false;
1426 mutex_lock(&glob->device_list_mutex);
1427 list_del(&bdev->device_list);
1428 mutex_unlock(&glob->device_list_mutex);
1430 cancel_delayed_work_sync(&bdev->wq);
1432 while (ttm_bo_delayed_delete(bdev, true))
1435 spin_lock(&glob->lru_lock);
1436 if (list_empty(&bdev->ddestroy))
1437 TTM_DEBUG("Delayed destroy list was clean\n");
1439 if (list_empty(&bdev->man[0].lru))
1440 TTM_DEBUG("Swap list was clean\n");
1441 spin_unlock(&glob->lru_lock);
1443 drm_vma_offset_manager_destroy(&bdev->vma_manager);
1447 EXPORT_SYMBOL(ttm_bo_device_release);
1449 int ttm_bo_device_init(struct ttm_bo_device *bdev,
1450 struct ttm_bo_global *glob,
1451 struct ttm_bo_driver *driver,
1452 uint64_t file_page_offset,
1457 bdev->driver = driver;
1459 memset(bdev->man, 0, sizeof(bdev->man));
1462 * Initialize the system memory buffer type.
1463 * Other types need to be driver / IOCTL initialized.
1465 ret = ttm_bo_init_mm(bdev, TTM_PL_SYSTEM, 0);
1466 if (unlikely(ret != 0))
1469 drm_vma_offset_manager_init(&bdev->vma_manager, file_page_offset,
1471 INIT_DELAYED_WORK(&bdev->wq, ttm_bo_delayed_workqueue);
1472 INIT_LIST_HEAD(&bdev->ddestroy);
1473 bdev->dev_mapping = NULL;
1475 bdev->need_dma32 = need_dma32;
1477 spin_lock_init(&bdev->fence_lock);
1478 mutex_lock(&glob->device_list_mutex);
1479 list_add_tail(&bdev->device_list, &glob->device_list);
1480 mutex_unlock(&glob->device_list_mutex);
1486 EXPORT_SYMBOL(ttm_bo_device_init);
1489 * buffer object vm functions.
1492 bool ttm_mem_reg_is_pci(struct ttm_bo_device *bdev, struct ttm_mem_reg *mem)
1494 struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
1496 if (!(man->flags & TTM_MEMTYPE_FLAG_FIXED)) {
1497 if (mem->mem_type == TTM_PL_SYSTEM)
1500 if (man->flags & TTM_MEMTYPE_FLAG_CMA)
1503 if (mem->placement & TTM_PL_FLAG_CACHED)
1509 void ttm_bo_unmap_virtual_locked(struct ttm_buffer_object *bo)
1511 struct ttm_bo_device *bdev = bo->bdev;
1513 drm_vma_node_unmap(&bo->vma_node, bdev->dev_mapping);
1514 ttm_mem_io_free_vm(bo);
1517 void ttm_bo_unmap_virtual(struct ttm_buffer_object *bo)
1519 struct ttm_bo_device *bdev = bo->bdev;
1520 struct ttm_mem_type_manager *man = &bdev->man[bo->mem.mem_type];
1522 ttm_mem_io_lock(man, false);
1523 ttm_bo_unmap_virtual_locked(bo);
1524 ttm_mem_io_unlock(man);
1528 EXPORT_SYMBOL(ttm_bo_unmap_virtual);
1531 int ttm_bo_wait(struct ttm_buffer_object *bo,
1532 bool lazy, bool interruptible, bool no_wait)
1534 struct ttm_bo_driver *driver = bo->bdev->driver;
1535 struct ttm_bo_device *bdev = bo->bdev;
1539 if (likely(bo->sync_obj == NULL))
1542 while (bo->sync_obj) {
1544 if (driver->sync_obj_signaled(bo->sync_obj)) {
1545 void *tmp_obj = bo->sync_obj;
1546 bo->sync_obj = NULL;
1547 clear_bit(TTM_BO_PRIV_FLAG_MOVING, &bo->priv_flags);
1548 spin_unlock(&bdev->fence_lock);
1549 driver->sync_obj_unref(&tmp_obj);
1550 spin_lock(&bdev->fence_lock);
1557 sync_obj = driver->sync_obj_ref(bo->sync_obj);
1558 spin_unlock(&bdev->fence_lock);
1559 ret = driver->sync_obj_wait(sync_obj,
1560 lazy, interruptible);
1561 if (unlikely(ret != 0)) {
1562 driver->sync_obj_unref(&sync_obj);
1563 spin_lock(&bdev->fence_lock);
1566 spin_lock(&bdev->fence_lock);
1567 if (likely(bo->sync_obj == sync_obj)) {
1568 void *tmp_obj = bo->sync_obj;
1569 bo->sync_obj = NULL;
1570 clear_bit(TTM_BO_PRIV_FLAG_MOVING,
1572 spin_unlock(&bdev->fence_lock);
1573 driver->sync_obj_unref(&sync_obj);
1574 driver->sync_obj_unref(&tmp_obj);
1575 spin_lock(&bdev->fence_lock);
1577 spin_unlock(&bdev->fence_lock);
1578 driver->sync_obj_unref(&sync_obj);
1579 spin_lock(&bdev->fence_lock);
1584 EXPORT_SYMBOL(ttm_bo_wait);
1586 int ttm_bo_synccpu_write_grab(struct ttm_buffer_object *bo, bool no_wait)
1588 struct ttm_bo_device *bdev = bo->bdev;
1592 * Using ttm_bo_reserve makes sure the lru lists are updated.
1595 ret = ttm_bo_reserve(bo, true, no_wait, false, 0);
1596 if (unlikely(ret != 0))
1598 spin_lock(&bdev->fence_lock);
1599 ret = ttm_bo_wait(bo, false, true, no_wait);
1600 spin_unlock(&bdev->fence_lock);
1601 if (likely(ret == 0))
1602 atomic_inc(&bo->cpu_writers);
1603 ttm_bo_unreserve(bo);
1606 EXPORT_SYMBOL(ttm_bo_synccpu_write_grab);
1608 void ttm_bo_synccpu_write_release(struct ttm_buffer_object *bo)
1610 atomic_dec(&bo->cpu_writers);
1612 EXPORT_SYMBOL(ttm_bo_synccpu_write_release);
1615 * A buffer object shrink method that tries to swap out the first
1616 * buffer object on the bo_global::swap_lru list.
1619 static int ttm_bo_swapout(struct ttm_mem_shrink *shrink)
1621 struct ttm_bo_global *glob =
1622 container_of(shrink, struct ttm_bo_global, shrink);
1623 struct ttm_buffer_object *bo;
1626 uint32_t swap_placement = (TTM_PL_FLAG_CACHED | TTM_PL_FLAG_SYSTEM);
1628 spin_lock(&glob->lru_lock);
1629 list_for_each_entry(bo, &glob->swap_lru, swap) {
1630 ret = ttm_bo_reserve_nolru(bo, false, true, false, 0);
1636 spin_unlock(&glob->lru_lock);
1640 kref_get(&bo->list_kref);
1642 if (!list_empty(&bo->ddestroy)) {
1643 ret = ttm_bo_cleanup_refs_and_unlock(bo, false, false);
1644 kref_put(&bo->list_kref, ttm_bo_release_list);
1648 put_count = ttm_bo_del_from_lru(bo);
1649 spin_unlock(&glob->lru_lock);
1651 ttm_bo_list_ref_sub(bo, put_count, true);
1654 * Wait for GPU, then move to system cached.
1657 spin_lock(&bo->bdev->fence_lock);
1658 ret = ttm_bo_wait(bo, false, false, false);
1659 spin_unlock(&bo->bdev->fence_lock);
1661 if (unlikely(ret != 0))
1664 if ((bo->mem.placement & swap_placement) != swap_placement) {
1665 struct ttm_mem_reg evict_mem;
1667 evict_mem = bo->mem;
1668 evict_mem.mm_node = NULL;
1669 evict_mem.placement = TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED;
1670 evict_mem.mem_type = TTM_PL_SYSTEM;
1672 ret = ttm_bo_handle_move_mem(bo, &evict_mem, true,
1674 if (unlikely(ret != 0))
1678 ttm_bo_unmap_virtual(bo);
1681 * Swap out. Buffer will be swapped in again as soon as
1682 * anyone tries to access a ttm page.
1685 if (bo->bdev->driver->swap_notify)
1686 bo->bdev->driver->swap_notify(bo);
1688 ret = ttm_tt_swapout(bo->ttm, bo->persistent_swap_storage);
1693 * Unreserve without putting on LRU to avoid swapping out an
1694 * already swapped buffer.
1697 ww_mutex_unlock(&bo->resv->lock);
1698 kref_put(&bo->list_kref, ttm_bo_release_list);
1702 void ttm_bo_swapout_all(struct ttm_bo_device *bdev)
1704 while (ttm_bo_swapout(&bdev->glob->shrink) == 0)
1707 EXPORT_SYMBOL(ttm_bo_swapout_all);
1710 * ttm_bo_wait_unreserved - interruptible wait for a buffer object to become
1713 * @bo: Pointer to buffer
1715 int ttm_bo_wait_unreserved(struct ttm_buffer_object *bo)
1720 * In the absense of a wait_unlocked API,
1721 * Use the bo::wu_mutex to avoid triggering livelocks due to
1722 * concurrent use of this function. Note that this use of
1723 * bo::wu_mutex can go away if we change locking order to
1724 * mmap_sem -> bo::reserve.
1726 ret = mutex_lock_interruptible(&bo->wu_mutex);
1727 if (unlikely(ret != 0))
1728 return -ERESTARTSYS;
1729 if (!ww_mutex_is_locked(&bo->resv->lock))
1731 ret = ttm_bo_reserve_nolru(bo, true, false, false, NULL);
1732 if (unlikely(ret != 0))
1734 ww_mutex_unlock(&bo->resv->lock);
1737 mutex_unlock(&bo->wu_mutex);