1 /**************************************************************************
3 * Copyright (c) 2006-2009 VMware, Inc., Palo Alto, CA., USA
6 * Permission is hereby granted, free of charge, to any person obtaining a
7 * copy of this software and associated documentation files (the
8 * "Software"), to deal in the Software without restriction, including
9 * without limitation the rights to use, copy, modify, merge, publish,
10 * distribute, sub license, and/or sell copies of the Software, and to
11 * permit persons to whom the Software is furnished to do so, subject to
12 * the following conditions:
14 * The above copyright notice and this permission notice (including the
15 * next paragraph) shall be included in all copies or substantial portions
18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
19 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
20 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
21 * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
22 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
23 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
24 * USE OR OTHER DEALINGS IN THE SOFTWARE.
26 **************************************************************************/
28 * Authors: Thomas Hellstrom <thellstrom-at-vmware-dot-com>
31 #define pr_fmt(fmt) "[TTM] " fmt
33 #include <drm/ttm/ttm_module.h>
34 #include <drm/ttm/ttm_bo_driver.h>
35 #include <drm/ttm/ttm_placement.h>
36 #include <linux/jiffies.h>
37 #include <linux/slab.h>
38 #include <linux/sched.h>
40 #include <linux/file.h>
41 #include <linux/module.h>
42 #include <linux/atomic.h>
43 #include <linux/reservation.h>
45 #define TTM_ASSERT_LOCKED(param)
46 #define TTM_DEBUG(fmt, arg...)
47 #define TTM_BO_HASH_ORDER 13
49 static int ttm_bo_swapout(struct ttm_mem_shrink *shrink);
50 static void ttm_bo_global_kobj_release(struct kobject *kobj);
52 static struct attribute ttm_bo_count = {
57 static inline int ttm_mem_type_from_place(const struct ttm_place *place,
62 for (i = 0; i <= TTM_PL_PRIV5; i++)
63 if (place->flags & (1 << i)) {
70 static void ttm_mem_type_debug(struct ttm_bo_device *bdev, int mem_type)
72 struct ttm_mem_type_manager *man = &bdev->man[mem_type];
74 pr_err(" has_type: %d\n", man->has_type);
75 pr_err(" use_type: %d\n", man->use_type);
76 pr_err(" flags: 0x%08X\n", man->flags);
77 pr_err(" gpu_offset: 0x%08llX\n", man->gpu_offset);
78 pr_err(" size: %llu\n", man->size);
79 pr_err(" available_caching: 0x%08X\n", man->available_caching);
80 pr_err(" default_caching: 0x%08X\n", man->default_caching);
81 if (mem_type != TTM_PL_SYSTEM)
82 (*man->func->debug)(man, TTM_PFX);
85 static void ttm_bo_mem_space_debug(struct ttm_buffer_object *bo,
86 struct ttm_placement *placement)
90 pr_err("No space for %p (%lu pages, %luK, %luM)\n",
91 bo, bo->mem.num_pages, bo->mem.size >> 10,
93 for (i = 0; i < placement->num_placement; i++) {
94 ret = ttm_mem_type_from_place(&placement->placement[i],
98 pr_err(" placement[%d]=0x%08X (%d)\n",
99 i, placement->placement[i].flags, mem_type);
100 ttm_mem_type_debug(bo->bdev, mem_type);
104 static ssize_t ttm_bo_global_show(struct kobject *kobj,
105 struct attribute *attr,
108 struct ttm_bo_global *glob =
109 container_of(kobj, struct ttm_bo_global, kobj);
111 return snprintf(buffer, PAGE_SIZE, "%lu\n",
112 (unsigned long) atomic_read(&glob->bo_count));
115 static struct attribute *ttm_bo_global_attrs[] = {
120 static const struct sysfs_ops ttm_bo_global_ops = {
121 .show = &ttm_bo_global_show
124 static struct kobj_type ttm_bo_glob_kobj_type = {
125 .release = &ttm_bo_global_kobj_release,
126 .sysfs_ops = &ttm_bo_global_ops,
127 .default_attrs = ttm_bo_global_attrs
131 static inline uint32_t ttm_bo_type_flags(unsigned type)
136 static void ttm_bo_release_list(struct kref *list_kref)
138 struct ttm_buffer_object *bo =
139 container_of(list_kref, struct ttm_buffer_object, list_kref);
140 struct ttm_bo_device *bdev = bo->bdev;
141 size_t acc_size = bo->acc_size;
143 BUG_ON(atomic_read(&bo->list_kref.refcount));
144 BUG_ON(atomic_read(&bo->kref.refcount));
145 BUG_ON(atomic_read(&bo->cpu_writers));
146 BUG_ON(bo->mem.mm_node != NULL);
147 BUG_ON(!list_empty(&bo->lru));
148 BUG_ON(!list_empty(&bo->ddestroy));
151 ttm_tt_destroy(bo->ttm);
152 atomic_dec(&bo->glob->bo_count);
153 if (bo->resv == &bo->ttm_resv)
154 reservation_object_fini(&bo->ttm_resv);
155 mutex_destroy(&bo->wu_mutex);
161 ttm_mem_global_free(bdev->glob->mem_glob, acc_size);
164 void ttm_bo_add_to_lru(struct ttm_buffer_object *bo)
166 struct ttm_bo_device *bdev = bo->bdev;
167 struct ttm_mem_type_manager *man;
169 lockdep_assert_held(&bo->resv->lock.base);
171 if (!(bo->mem.placement & TTM_PL_FLAG_NO_EVICT)) {
173 BUG_ON(!list_empty(&bo->lru));
175 man = &bdev->man[bo->mem.mem_type];
176 list_add_tail(&bo->lru, &man->lru);
177 kref_get(&bo->list_kref);
179 if (bo->ttm && !(bo->ttm->page_flags & TTM_PAGE_FLAG_SG)) {
180 list_add_tail(&bo->swap, &bo->glob->swap_lru);
181 kref_get(&bo->list_kref);
185 EXPORT_SYMBOL(ttm_bo_add_to_lru);
187 int ttm_bo_del_from_lru(struct ttm_buffer_object *bo)
191 if (!list_empty(&bo->swap)) {
192 list_del_init(&bo->swap);
195 if (!list_empty(&bo->lru)) {
196 list_del_init(&bo->lru);
201 * TODO: Add a driver hook to delete from
202 * driver-specific LRU's here.
208 static void ttm_bo_ref_bug(struct kref *list_kref)
213 void ttm_bo_list_ref_sub(struct ttm_buffer_object *bo, int count,
216 kref_sub(&bo->list_kref, count,
217 (never_free) ? ttm_bo_ref_bug : ttm_bo_release_list);
220 void ttm_bo_del_sub_from_lru(struct ttm_buffer_object *bo)
224 spin_lock(&bo->glob->lru_lock);
225 put_count = ttm_bo_del_from_lru(bo);
226 spin_unlock(&bo->glob->lru_lock);
227 ttm_bo_list_ref_sub(bo, put_count, true);
229 EXPORT_SYMBOL(ttm_bo_del_sub_from_lru);
231 void ttm_bo_move_to_lru_tail(struct ttm_buffer_object *bo)
233 struct ttm_bo_device *bdev = bo->bdev;
234 struct ttm_mem_type_manager *man;
236 lockdep_assert_held(&bo->resv->lock.base);
238 if (bo->mem.placement & TTM_PL_FLAG_NO_EVICT) {
239 list_del_init(&bo->swap);
240 list_del_init(&bo->lru);
243 if (bo->ttm && !(bo->ttm->page_flags & TTM_PAGE_FLAG_SG))
244 list_move_tail(&bo->swap, &bo->glob->swap_lru);
246 man = &bdev->man[bo->mem.mem_type];
247 list_move_tail(&bo->lru, &man->lru);
250 EXPORT_SYMBOL(ttm_bo_move_to_lru_tail);
253 * Call bo->mutex locked.
255 static int ttm_bo_add_ttm(struct ttm_buffer_object *bo, bool zero_alloc)
257 struct ttm_bo_device *bdev = bo->bdev;
258 struct ttm_bo_global *glob = bo->glob;
260 uint32_t page_flags = 0;
262 TTM_ASSERT_LOCKED(&bo->mutex);
265 if (bdev->need_dma32)
266 page_flags |= TTM_PAGE_FLAG_DMA32;
269 case ttm_bo_type_device:
271 page_flags |= TTM_PAGE_FLAG_ZERO_ALLOC;
272 case ttm_bo_type_kernel:
273 bo->ttm = bdev->driver->ttm_tt_create(bdev, bo->num_pages << PAGE_SHIFT,
274 page_flags, glob->dummy_read_page);
275 if (unlikely(bo->ttm == NULL))
279 bo->ttm = bdev->driver->ttm_tt_create(bdev, bo->num_pages << PAGE_SHIFT,
280 page_flags | TTM_PAGE_FLAG_SG,
281 glob->dummy_read_page);
282 if (unlikely(bo->ttm == NULL)) {
286 bo->ttm->sg = bo->sg;
289 pr_err("Illegal buffer object type\n");
297 static int ttm_bo_handle_move_mem(struct ttm_buffer_object *bo,
298 struct ttm_mem_reg *mem,
299 bool evict, bool interruptible,
302 struct ttm_bo_device *bdev = bo->bdev;
303 bool old_is_pci = ttm_mem_reg_is_pci(bdev, &bo->mem);
304 bool new_is_pci = ttm_mem_reg_is_pci(bdev, mem);
305 struct ttm_mem_type_manager *old_man = &bdev->man[bo->mem.mem_type];
306 struct ttm_mem_type_manager *new_man = &bdev->man[mem->mem_type];
309 if (old_is_pci || new_is_pci ||
310 ((mem->placement & bo->mem.placement & TTM_PL_MASK_CACHING) == 0)) {
311 ret = ttm_mem_io_lock(old_man, true);
312 if (unlikely(ret != 0))
314 ttm_bo_unmap_virtual_locked(bo);
315 ttm_mem_io_unlock(old_man);
319 * Create and bind a ttm if required.
322 if (!(new_man->flags & TTM_MEMTYPE_FLAG_FIXED)) {
323 if (bo->ttm == NULL) {
324 bool zero = !(old_man->flags & TTM_MEMTYPE_FLAG_FIXED);
325 ret = ttm_bo_add_ttm(bo, zero);
330 ret = ttm_tt_set_placement_caching(bo->ttm, mem->placement);
334 if (mem->mem_type != TTM_PL_SYSTEM) {
335 ret = ttm_tt_bind(bo->ttm, mem);
340 if (bo->mem.mem_type == TTM_PL_SYSTEM) {
341 if (bdev->driver->move_notify)
342 bdev->driver->move_notify(bo, mem);
349 if (bdev->driver->move_notify)
350 bdev->driver->move_notify(bo, mem);
352 if (!(old_man->flags & TTM_MEMTYPE_FLAG_FIXED) &&
353 !(new_man->flags & TTM_MEMTYPE_FLAG_FIXED))
354 ret = ttm_bo_move_ttm(bo, evict, no_wait_gpu, mem);
355 else if (bdev->driver->move)
356 ret = bdev->driver->move(bo, evict, interruptible,
359 ret = ttm_bo_move_memcpy(bo, evict, no_wait_gpu, mem);
362 if (bdev->driver->move_notify) {
363 struct ttm_mem_reg tmp_mem = *mem;
366 bdev->driver->move_notify(bo, mem);
376 if (bdev->driver->invalidate_caches) {
377 ret = bdev->driver->invalidate_caches(bdev, bo->mem.placement);
379 pr_err("Can not flush read caches\n");
384 if (bo->mem.mm_node) {
385 bo->offset = (bo->mem.start << PAGE_SHIFT) +
386 bdev->man[bo->mem.mem_type].gpu_offset;
387 bo->cur_placement = bo->mem.placement;
394 new_man = &bdev->man[bo->mem.mem_type];
395 if ((new_man->flags & TTM_MEMTYPE_FLAG_FIXED) && bo->ttm) {
396 ttm_tt_unbind(bo->ttm);
397 ttm_tt_destroy(bo->ttm);
406 * Will release GPU memory type usage on destruction.
407 * This is the place to put in driver specific hooks to release
408 * driver private resources.
409 * Will release the bo::reserved lock.
412 static void ttm_bo_cleanup_memtype_use(struct ttm_buffer_object *bo)
414 if (bo->bdev->driver->move_notify)
415 bo->bdev->driver->move_notify(bo, NULL);
418 ttm_tt_unbind(bo->ttm);
419 ttm_tt_destroy(bo->ttm);
422 ttm_bo_mem_put(bo, &bo->mem);
424 ww_mutex_unlock (&bo->resv->lock);
427 static void ttm_bo_flush_all_fences(struct ttm_buffer_object *bo)
429 struct reservation_object_list *fobj;
433 fobj = reservation_object_get_list(bo->resv);
434 fence = reservation_object_get_excl(bo->resv);
435 if (fence && !fence->ops->signaled)
436 fence_enable_sw_signaling(fence);
438 for (i = 0; fobj && i < fobj->shared_count; ++i) {
439 fence = rcu_dereference_protected(fobj->shared[i],
440 reservation_object_held(bo->resv));
442 if (!fence->ops->signaled)
443 fence_enable_sw_signaling(fence);
447 static void ttm_bo_cleanup_refs_or_queue(struct ttm_buffer_object *bo)
449 struct ttm_bo_device *bdev = bo->bdev;
450 struct ttm_bo_global *glob = bo->glob;
454 spin_lock(&glob->lru_lock);
455 ret = __ttm_bo_reserve(bo, false, true, false, NULL);
458 if (!ttm_bo_wait(bo, false, false, true)) {
459 put_count = ttm_bo_del_from_lru(bo);
461 spin_unlock(&glob->lru_lock);
462 ttm_bo_cleanup_memtype_use(bo);
464 ttm_bo_list_ref_sub(bo, put_count, true);
468 ttm_bo_flush_all_fences(bo);
471 * Make NO_EVICT bos immediately available to
472 * shrinkers, now that they are queued for
475 if (bo->mem.placement & TTM_PL_FLAG_NO_EVICT) {
476 bo->mem.placement &= ~TTM_PL_FLAG_NO_EVICT;
477 ttm_bo_add_to_lru(bo);
480 __ttm_bo_unreserve(bo);
483 kref_get(&bo->list_kref);
484 list_add_tail(&bo->ddestroy, &bdev->ddestroy);
485 spin_unlock(&glob->lru_lock);
487 schedule_delayed_work(&bdev->wq,
488 ((HZ / 100) < 1) ? 1 : HZ / 100);
492 * function ttm_bo_cleanup_refs_and_unlock
493 * If bo idle, remove from delayed- and lru lists, and unref.
494 * If not idle, do nothing.
496 * Must be called with lru_lock and reservation held, this function
497 * will drop both before returning.
499 * @interruptible Any sleeps should occur interruptibly.
500 * @no_wait_gpu Never wait for gpu. Return -EBUSY instead.
503 static int ttm_bo_cleanup_refs_and_unlock(struct ttm_buffer_object *bo,
507 struct ttm_bo_global *glob = bo->glob;
511 ret = ttm_bo_wait(bo, false, false, true);
513 if (ret && !no_wait_gpu) {
515 ww_mutex_unlock(&bo->resv->lock);
516 spin_unlock(&glob->lru_lock);
518 lret = reservation_object_wait_timeout_rcu(bo->resv,
528 spin_lock(&glob->lru_lock);
529 ret = __ttm_bo_reserve(bo, false, true, false, NULL);
532 * We raced, and lost, someone else holds the reservation now,
533 * and is probably busy in ttm_bo_cleanup_memtype_use.
535 * Even if it's not the case, because we finished waiting any
536 * delayed destruction would succeed, so just return success
540 spin_unlock(&glob->lru_lock);
545 * remove sync_obj with ttm_bo_wait, the wait should be
546 * finished, and no new wait object should have been added.
548 ret = ttm_bo_wait(bo, false, false, true);
552 if (ret || unlikely(list_empty(&bo->ddestroy))) {
553 __ttm_bo_unreserve(bo);
554 spin_unlock(&glob->lru_lock);
558 put_count = ttm_bo_del_from_lru(bo);
559 list_del_init(&bo->ddestroy);
562 spin_unlock(&glob->lru_lock);
563 ttm_bo_cleanup_memtype_use(bo);
565 ttm_bo_list_ref_sub(bo, put_count, true);
571 * Traverse the delayed list, and call ttm_bo_cleanup_refs on all
572 * encountered buffers.
575 static int ttm_bo_delayed_delete(struct ttm_bo_device *bdev, bool remove_all)
577 struct ttm_bo_global *glob = bdev->glob;
578 struct ttm_buffer_object *entry = NULL;
581 spin_lock(&glob->lru_lock);
582 if (list_empty(&bdev->ddestroy))
585 entry = list_first_entry(&bdev->ddestroy,
586 struct ttm_buffer_object, ddestroy);
587 kref_get(&entry->list_kref);
590 struct ttm_buffer_object *nentry = NULL;
592 if (entry->ddestroy.next != &bdev->ddestroy) {
593 nentry = list_first_entry(&entry->ddestroy,
594 struct ttm_buffer_object, ddestroy);
595 kref_get(&nentry->list_kref);
598 ret = __ttm_bo_reserve(entry, false, true, false, NULL);
599 if (remove_all && ret) {
600 spin_unlock(&glob->lru_lock);
601 ret = __ttm_bo_reserve(entry, false, false,
603 spin_lock(&glob->lru_lock);
607 ret = ttm_bo_cleanup_refs_and_unlock(entry, false,
610 spin_unlock(&glob->lru_lock);
612 kref_put(&entry->list_kref, ttm_bo_release_list);
618 spin_lock(&glob->lru_lock);
619 if (list_empty(&entry->ddestroy))
624 spin_unlock(&glob->lru_lock);
627 kref_put(&entry->list_kref, ttm_bo_release_list);
631 static void ttm_bo_delayed_workqueue(struct work_struct *work)
633 struct ttm_bo_device *bdev =
634 container_of(work, struct ttm_bo_device, wq.work);
636 if (ttm_bo_delayed_delete(bdev, false)) {
637 schedule_delayed_work(&bdev->wq,
638 ((HZ / 100) < 1) ? 1 : HZ / 100);
642 static void ttm_bo_release(struct kref *kref)
644 struct ttm_buffer_object *bo =
645 container_of(kref, struct ttm_buffer_object, kref);
646 struct ttm_bo_device *bdev = bo->bdev;
647 struct ttm_mem_type_manager *man = &bdev->man[bo->mem.mem_type];
649 drm_vma_offset_remove(&bdev->vma_manager, &bo->vma_node);
650 ttm_mem_io_lock(man, false);
651 ttm_mem_io_free_vm(bo);
652 ttm_mem_io_unlock(man);
653 ttm_bo_cleanup_refs_or_queue(bo);
654 kref_put(&bo->list_kref, ttm_bo_release_list);
657 void ttm_bo_unref(struct ttm_buffer_object **p_bo)
659 struct ttm_buffer_object *bo = *p_bo;
662 kref_put(&bo->kref, ttm_bo_release);
664 EXPORT_SYMBOL(ttm_bo_unref);
666 int ttm_bo_lock_delayed_workqueue(struct ttm_bo_device *bdev)
668 return cancel_delayed_work_sync(&bdev->wq);
670 EXPORT_SYMBOL(ttm_bo_lock_delayed_workqueue);
672 void ttm_bo_unlock_delayed_workqueue(struct ttm_bo_device *bdev, int resched)
675 schedule_delayed_work(&bdev->wq,
676 ((HZ / 100) < 1) ? 1 : HZ / 100);
678 EXPORT_SYMBOL(ttm_bo_unlock_delayed_workqueue);
680 static int ttm_bo_evict(struct ttm_buffer_object *bo, bool interruptible,
683 struct ttm_bo_device *bdev = bo->bdev;
684 struct ttm_mem_reg evict_mem;
685 struct ttm_placement placement;
688 ret = ttm_bo_wait(bo, false, interruptible, no_wait_gpu);
690 if (unlikely(ret != 0)) {
691 if (ret != -ERESTARTSYS) {
692 pr_err("Failed to expire sync object before buffer eviction\n");
697 lockdep_assert_held(&bo->resv->lock.base);
700 evict_mem.mm_node = NULL;
701 evict_mem.bus.io_reserved_vm = false;
702 evict_mem.bus.io_reserved_count = 0;
704 placement.num_placement = 0;
705 placement.num_busy_placement = 0;
706 bdev->driver->evict_flags(bo, &placement);
707 ret = ttm_bo_mem_space(bo, &placement, &evict_mem, interruptible,
710 if (ret != -ERESTARTSYS) {
711 pr_err("Failed to find memory space for buffer 0x%p eviction\n",
713 ttm_bo_mem_space_debug(bo, &placement);
718 ret = ttm_bo_handle_move_mem(bo, &evict_mem, true, interruptible,
721 if (ret != -ERESTARTSYS)
722 pr_err("Buffer eviction failed\n");
723 ttm_bo_mem_put(bo, &evict_mem);
731 static int ttm_mem_evict_first(struct ttm_bo_device *bdev,
733 const struct ttm_place *place,
737 struct ttm_bo_global *glob = bdev->glob;
738 struct ttm_mem_type_manager *man = &bdev->man[mem_type];
739 struct ttm_buffer_object *bo;
740 int ret = -EBUSY, put_count;
742 spin_lock(&glob->lru_lock);
743 list_for_each_entry(bo, &man->lru, lru) {
744 ret = __ttm_bo_reserve(bo, false, true, false, NULL);
746 if (place && (place->fpfn || place->lpfn)) {
747 /* Don't evict this BO if it's outside of the
748 * requested placement range
750 if (place->fpfn >= (bo->mem.start + bo->mem.size) ||
751 (place->lpfn && place->lpfn <= bo->mem.start)) {
752 __ttm_bo_unreserve(bo);
763 spin_unlock(&glob->lru_lock);
767 kref_get(&bo->list_kref);
769 if (!list_empty(&bo->ddestroy)) {
770 ret = ttm_bo_cleanup_refs_and_unlock(bo, interruptible,
772 kref_put(&bo->list_kref, ttm_bo_release_list);
776 put_count = ttm_bo_del_from_lru(bo);
777 spin_unlock(&glob->lru_lock);
781 ttm_bo_list_ref_sub(bo, put_count, true);
783 ret = ttm_bo_evict(bo, interruptible, no_wait_gpu);
784 ttm_bo_unreserve(bo);
786 kref_put(&bo->list_kref, ttm_bo_release_list);
790 void ttm_bo_mem_put(struct ttm_buffer_object *bo, struct ttm_mem_reg *mem)
792 struct ttm_mem_type_manager *man = &bo->bdev->man[mem->mem_type];
795 (*man->func->put_node)(man, mem);
797 EXPORT_SYMBOL(ttm_bo_mem_put);
800 * Repeatedly evict memory from the LRU for @mem_type until we create enough
801 * space, or we've evicted everything and there isn't enough space.
803 static int ttm_bo_mem_force_space(struct ttm_buffer_object *bo,
805 const struct ttm_place *place,
806 struct ttm_mem_reg *mem,
810 struct ttm_bo_device *bdev = bo->bdev;
811 struct ttm_mem_type_manager *man = &bdev->man[mem_type];
815 ret = (*man->func->get_node)(man, bo, place, mem);
816 if (unlikely(ret != 0))
820 ret = ttm_mem_evict_first(bdev, mem_type, place,
821 interruptible, no_wait_gpu);
822 if (unlikely(ret != 0))
825 if (mem->mm_node == NULL)
827 mem->mem_type = mem_type;
831 static uint32_t ttm_bo_select_caching(struct ttm_mem_type_manager *man,
832 uint32_t cur_placement,
833 uint32_t proposed_placement)
835 uint32_t caching = proposed_placement & TTM_PL_MASK_CACHING;
836 uint32_t result = proposed_placement & ~TTM_PL_MASK_CACHING;
839 * Keep current caching if possible.
842 if ((cur_placement & caching) != 0)
843 result |= (cur_placement & caching);
844 else if ((man->default_caching & caching) != 0)
845 result |= man->default_caching;
846 else if ((TTM_PL_FLAG_CACHED & caching) != 0)
847 result |= TTM_PL_FLAG_CACHED;
848 else if ((TTM_PL_FLAG_WC & caching) != 0)
849 result |= TTM_PL_FLAG_WC;
850 else if ((TTM_PL_FLAG_UNCACHED & caching) != 0)
851 result |= TTM_PL_FLAG_UNCACHED;
856 static bool ttm_bo_mt_compatible(struct ttm_mem_type_manager *man,
858 const struct ttm_place *place,
859 uint32_t *masked_placement)
861 uint32_t cur_flags = ttm_bo_type_flags(mem_type);
863 if ((cur_flags & place->flags & TTM_PL_MASK_MEM) == 0)
866 if ((place->flags & man->available_caching) == 0)
869 cur_flags |= (place->flags & man->available_caching);
871 *masked_placement = cur_flags;
876 * Creates space for memory region @mem according to its type.
878 * This function first searches for free space in compatible memory types in
879 * the priority order defined by the driver. If free space isn't found, then
880 * ttm_bo_mem_force_space is attempted in priority order to evict and find
883 int ttm_bo_mem_space(struct ttm_buffer_object *bo,
884 struct ttm_placement *placement,
885 struct ttm_mem_reg *mem,
889 struct ttm_bo_device *bdev = bo->bdev;
890 struct ttm_mem_type_manager *man;
891 uint32_t mem_type = TTM_PL_SYSTEM;
892 uint32_t cur_flags = 0;
893 bool type_found = false;
894 bool type_ok = false;
895 bool has_erestartsys = false;
899 for (i = 0; i < placement->num_placement; ++i) {
900 const struct ttm_place *place = &placement->placement[i];
902 ret = ttm_mem_type_from_place(place, &mem_type);
905 man = &bdev->man[mem_type];
906 if (!man->has_type || !man->use_type)
909 type_ok = ttm_bo_mt_compatible(man, mem_type, place,
916 cur_flags = ttm_bo_select_caching(man, bo->mem.placement,
919 * Use the access and other non-mapping-related flag bits from
920 * the memory placement flags to the current flags
922 ttm_flag_masked(&cur_flags, place->flags,
923 ~TTM_PL_MASK_MEMTYPE);
925 if (mem_type == TTM_PL_SYSTEM)
928 ret = (*man->func->get_node)(man, bo, place, mem);
936 if ((type_ok && (mem_type == TTM_PL_SYSTEM)) || mem->mm_node) {
937 mem->mem_type = mem_type;
938 mem->placement = cur_flags;
942 for (i = 0; i < placement->num_busy_placement; ++i) {
943 const struct ttm_place *place = &placement->busy_placement[i];
945 ret = ttm_mem_type_from_place(place, &mem_type);
948 man = &bdev->man[mem_type];
949 if (!man->has_type || !man->use_type)
951 if (!ttm_bo_mt_compatible(man, mem_type, place, &cur_flags))
955 cur_flags = ttm_bo_select_caching(man, bo->mem.placement,
958 * Use the access and other non-mapping-related flag bits from
959 * the memory placement flags to the current flags
961 ttm_flag_masked(&cur_flags, place->flags,
962 ~TTM_PL_MASK_MEMTYPE);
964 if (mem_type == TTM_PL_SYSTEM) {
965 mem->mem_type = mem_type;
966 mem->placement = cur_flags;
971 ret = ttm_bo_mem_force_space(bo, mem_type, place, mem,
972 interruptible, no_wait_gpu);
973 if (ret == 0 && mem->mm_node) {
974 mem->placement = cur_flags;
977 if (ret == -ERESTARTSYS)
978 has_erestartsys = true;
982 printk(KERN_ERR TTM_PFX "No compatible memory type found.\n");
986 return (has_erestartsys) ? -ERESTARTSYS : -ENOMEM;
988 EXPORT_SYMBOL(ttm_bo_mem_space);
990 static int ttm_bo_move_buffer(struct ttm_buffer_object *bo,
991 struct ttm_placement *placement,
996 struct ttm_mem_reg mem;
998 lockdep_assert_held(&bo->resv->lock.base);
1001 * FIXME: It's possible to pipeline buffer moves.
1002 * Have the driver move function wait for idle when necessary,
1003 * instead of doing it here.
1005 ret = ttm_bo_wait(bo, false, interruptible, no_wait_gpu);
1008 mem.num_pages = bo->num_pages;
1009 mem.size = mem.num_pages << PAGE_SHIFT;
1010 mem.page_alignment = bo->mem.page_alignment;
1011 mem.bus.io_reserved_vm = false;
1012 mem.bus.io_reserved_count = 0;
1014 * Determine where to move the buffer.
1016 ret = ttm_bo_mem_space(bo, placement, &mem,
1017 interruptible, no_wait_gpu);
1020 ret = ttm_bo_handle_move_mem(bo, &mem, false,
1021 interruptible, no_wait_gpu);
1023 if (ret && mem.mm_node)
1024 ttm_bo_mem_put(bo, &mem);
1028 static bool ttm_bo_mem_compat(struct ttm_placement *placement,
1029 struct ttm_mem_reg *mem,
1030 uint32_t *new_flags)
1034 for (i = 0; i < placement->num_placement; i++) {
1035 const struct ttm_place *heap = &placement->placement[i];
1037 (mem->start < heap->fpfn ||
1038 (heap->lpfn != 0 && (mem->start + mem->num_pages) > heap->lpfn)))
1041 *new_flags = heap->flags;
1042 if ((*new_flags & mem->placement & TTM_PL_MASK_CACHING) &&
1043 (*new_flags & mem->placement & TTM_PL_MASK_MEM))
1047 for (i = 0; i < placement->num_busy_placement; i++) {
1048 const struct ttm_place *heap = &placement->busy_placement[i];
1050 (mem->start < heap->fpfn ||
1051 (heap->lpfn != 0 && (mem->start + mem->num_pages) > heap->lpfn)))
1054 *new_flags = heap->flags;
1055 if ((*new_flags & mem->placement & TTM_PL_MASK_CACHING) &&
1056 (*new_flags & mem->placement & TTM_PL_MASK_MEM))
1063 int ttm_bo_validate(struct ttm_buffer_object *bo,
1064 struct ttm_placement *placement,
1071 lockdep_assert_held(&bo->resv->lock.base);
1073 * Check whether we need to move buffer.
1075 if (!ttm_bo_mem_compat(placement, &bo->mem, &new_flags)) {
1076 ret = ttm_bo_move_buffer(bo, placement, interruptible,
1082 * Use the access and other non-mapping-related flag bits from
1083 * the compatible memory placement flags to the active flags
1085 ttm_flag_masked(&bo->mem.placement, new_flags,
1086 ~TTM_PL_MASK_MEMTYPE);
1089 * We might need to add a TTM.
1091 if (bo->mem.mem_type == TTM_PL_SYSTEM && bo->ttm == NULL) {
1092 ret = ttm_bo_add_ttm(bo, true);
1098 EXPORT_SYMBOL(ttm_bo_validate);
1100 int ttm_bo_init(struct ttm_bo_device *bdev,
1101 struct ttm_buffer_object *bo,
1103 enum ttm_bo_type type,
1104 struct ttm_placement *placement,
1105 uint32_t page_alignment,
1107 struct file *persistent_swap_storage,
1109 struct sg_table *sg,
1110 struct reservation_object *resv,
1111 void (*destroy) (struct ttm_buffer_object *))
1114 unsigned long num_pages;
1115 struct ttm_mem_global *mem_glob = bdev->glob->mem_glob;
1118 ret = ttm_mem_global_alloc(mem_glob, acc_size, false, false);
1120 pr_err("Out of kernel memory\n");
1128 num_pages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
1129 if (num_pages == 0) {
1130 pr_err("Illegal buffer object size\n");
1135 ttm_mem_global_free(mem_glob, acc_size);
1138 bo->destroy = destroy;
1140 kref_init(&bo->kref);
1141 kref_init(&bo->list_kref);
1142 atomic_set(&bo->cpu_writers, 0);
1143 INIT_LIST_HEAD(&bo->lru);
1144 INIT_LIST_HEAD(&bo->ddestroy);
1145 INIT_LIST_HEAD(&bo->swap);
1146 INIT_LIST_HEAD(&bo->io_reserve_lru);
1147 mutex_init(&bo->wu_mutex);
1149 bo->glob = bdev->glob;
1151 bo->num_pages = num_pages;
1152 bo->mem.size = num_pages << PAGE_SHIFT;
1153 bo->mem.mem_type = TTM_PL_SYSTEM;
1154 bo->mem.num_pages = bo->num_pages;
1155 bo->mem.mm_node = NULL;
1156 bo->mem.page_alignment = page_alignment;
1157 bo->mem.bus.io_reserved_vm = false;
1158 bo->mem.bus.io_reserved_count = 0;
1160 bo->mem.placement = (TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED);
1161 bo->persistent_swap_storage = persistent_swap_storage;
1162 bo->acc_size = acc_size;
1166 lockdep_assert_held(&bo->resv->lock.base);
1168 bo->resv = &bo->ttm_resv;
1169 reservation_object_init(&bo->ttm_resv);
1171 atomic_inc(&bo->glob->bo_count);
1172 drm_vma_node_reset(&bo->vma_node);
1175 * For ttm_bo_type_device buffers, allocate
1176 * address space from the device.
1178 if (bo->type == ttm_bo_type_device ||
1179 bo->type == ttm_bo_type_sg)
1180 ret = drm_vma_offset_add(&bdev->vma_manager, &bo->vma_node,
1183 /* passed reservation objects should already be locked,
1184 * since otherwise lockdep will be angered in radeon.
1187 locked = ww_mutex_trylock(&bo->resv->lock);
1192 ret = ttm_bo_validate(bo, placement, interruptible, false);
1195 ttm_bo_unreserve(bo);
1197 } else if (!(bo->mem.placement & TTM_PL_FLAG_NO_EVICT)) {
1198 spin_lock(&bo->glob->lru_lock);
1199 ttm_bo_add_to_lru(bo);
1200 spin_unlock(&bo->glob->lru_lock);
1208 EXPORT_SYMBOL(ttm_bo_init);
1210 size_t ttm_bo_acc_size(struct ttm_bo_device *bdev,
1211 unsigned long bo_size,
1212 unsigned struct_size)
1214 unsigned npages = (PAGE_ALIGN(bo_size)) >> PAGE_SHIFT;
1217 size += ttm_round_pot(struct_size);
1218 size += PAGE_ALIGN(npages * sizeof(void *));
1219 size += ttm_round_pot(sizeof(struct ttm_tt));
1222 EXPORT_SYMBOL(ttm_bo_acc_size);
1224 size_t ttm_bo_dma_acc_size(struct ttm_bo_device *bdev,
1225 unsigned long bo_size,
1226 unsigned struct_size)
1228 unsigned npages = (PAGE_ALIGN(bo_size)) >> PAGE_SHIFT;
1231 size += ttm_round_pot(struct_size);
1232 size += PAGE_ALIGN(npages * sizeof(void *));
1233 size += PAGE_ALIGN(npages * sizeof(dma_addr_t));
1234 size += ttm_round_pot(sizeof(struct ttm_dma_tt));
1237 EXPORT_SYMBOL(ttm_bo_dma_acc_size);
1239 int ttm_bo_create(struct ttm_bo_device *bdev,
1241 enum ttm_bo_type type,
1242 struct ttm_placement *placement,
1243 uint32_t page_alignment,
1245 struct file *persistent_swap_storage,
1246 struct ttm_buffer_object **p_bo)
1248 struct ttm_buffer_object *bo;
1252 bo = kzalloc(sizeof(*bo), GFP_KERNEL);
1253 if (unlikely(bo == NULL))
1256 acc_size = ttm_bo_acc_size(bdev, size, sizeof(struct ttm_buffer_object));
1257 ret = ttm_bo_init(bdev, bo, size, type, placement, page_alignment,
1258 interruptible, persistent_swap_storage, acc_size,
1260 if (likely(ret == 0))
1265 EXPORT_SYMBOL(ttm_bo_create);
1267 static int ttm_bo_force_list_clean(struct ttm_bo_device *bdev,
1268 unsigned mem_type, bool allow_errors)
1270 struct ttm_mem_type_manager *man = &bdev->man[mem_type];
1271 struct ttm_bo_global *glob = bdev->glob;
1275 * Can't use standard list traversal since we're unlocking.
1278 spin_lock(&glob->lru_lock);
1279 while (!list_empty(&man->lru)) {
1280 spin_unlock(&glob->lru_lock);
1281 ret = ttm_mem_evict_first(bdev, mem_type, NULL, false, false);
1286 pr_err("Cleanup eviction failed\n");
1289 spin_lock(&glob->lru_lock);
1291 spin_unlock(&glob->lru_lock);
1295 int ttm_bo_clean_mm(struct ttm_bo_device *bdev, unsigned mem_type)
1297 struct ttm_mem_type_manager *man;
1300 if (mem_type >= TTM_NUM_MEM_TYPES) {
1301 pr_err("Illegal memory type %d\n", mem_type);
1304 man = &bdev->man[mem_type];
1306 if (!man->has_type) {
1307 pr_err("Trying to take down uninitialized memory manager type %u\n",
1312 man->use_type = false;
1313 man->has_type = false;
1317 ttm_bo_force_list_clean(bdev, mem_type, false);
1319 ret = (*man->func->takedown)(man);
1324 EXPORT_SYMBOL(ttm_bo_clean_mm);
1326 int ttm_bo_evict_mm(struct ttm_bo_device *bdev, unsigned mem_type)
1328 struct ttm_mem_type_manager *man = &bdev->man[mem_type];
1330 if (mem_type == 0 || mem_type >= TTM_NUM_MEM_TYPES) {
1331 pr_err("Illegal memory manager memory type %u\n", mem_type);
1335 if (!man->has_type) {
1336 pr_err("Memory type %u has not been initialized\n", mem_type);
1340 return ttm_bo_force_list_clean(bdev, mem_type, true);
1342 EXPORT_SYMBOL(ttm_bo_evict_mm);
1344 int ttm_bo_init_mm(struct ttm_bo_device *bdev, unsigned type,
1345 unsigned long p_size)
1348 struct ttm_mem_type_manager *man;
1350 BUG_ON(type >= TTM_NUM_MEM_TYPES);
1351 man = &bdev->man[type];
1352 BUG_ON(man->has_type);
1353 man->io_reserve_fastpath = true;
1354 man->use_io_reserve_lru = false;
1355 mutex_init(&man->io_reserve_mutex);
1356 INIT_LIST_HEAD(&man->io_reserve_lru);
1358 ret = bdev->driver->init_mem_type(bdev, type, man);
1364 if (type != TTM_PL_SYSTEM) {
1365 ret = (*man->func->init)(man, p_size);
1369 man->has_type = true;
1370 man->use_type = true;
1373 INIT_LIST_HEAD(&man->lru);
1377 EXPORT_SYMBOL(ttm_bo_init_mm);
1379 static void ttm_bo_global_kobj_release(struct kobject *kobj)
1381 struct ttm_bo_global *glob =
1382 container_of(kobj, struct ttm_bo_global, kobj);
1384 ttm_mem_unregister_shrink(glob->mem_glob, &glob->shrink);
1385 __free_page(glob->dummy_read_page);
1389 void ttm_bo_global_release(struct drm_global_reference *ref)
1391 struct ttm_bo_global *glob = ref->object;
1393 kobject_del(&glob->kobj);
1394 kobject_put(&glob->kobj);
1396 EXPORT_SYMBOL(ttm_bo_global_release);
1398 int ttm_bo_global_init(struct drm_global_reference *ref)
1400 struct ttm_bo_global_ref *bo_ref =
1401 container_of(ref, struct ttm_bo_global_ref, ref);
1402 struct ttm_bo_global *glob = ref->object;
1405 mutex_init(&glob->device_list_mutex);
1406 spin_lock_init(&glob->lru_lock);
1407 glob->mem_glob = bo_ref->mem_glob;
1408 glob->dummy_read_page = alloc_page(__GFP_ZERO | GFP_DMA32);
1410 if (unlikely(glob->dummy_read_page == NULL)) {
1415 INIT_LIST_HEAD(&glob->swap_lru);
1416 INIT_LIST_HEAD(&glob->device_list);
1418 ttm_mem_init_shrink(&glob->shrink, ttm_bo_swapout);
1419 ret = ttm_mem_register_shrink(glob->mem_glob, &glob->shrink);
1420 if (unlikely(ret != 0)) {
1421 pr_err("Could not register buffer object swapout\n");
1425 atomic_set(&glob->bo_count, 0);
1427 ret = kobject_init_and_add(
1428 &glob->kobj, &ttm_bo_glob_kobj_type, ttm_get_kobj(), "buffer_objects");
1429 if (unlikely(ret != 0))
1430 kobject_put(&glob->kobj);
1433 __free_page(glob->dummy_read_page);
1438 EXPORT_SYMBOL(ttm_bo_global_init);
1441 int ttm_bo_device_release(struct ttm_bo_device *bdev)
1444 unsigned i = TTM_NUM_MEM_TYPES;
1445 struct ttm_mem_type_manager *man;
1446 struct ttm_bo_global *glob = bdev->glob;
1449 man = &bdev->man[i];
1450 if (man->has_type) {
1451 man->use_type = false;
1452 if ((i != TTM_PL_SYSTEM) && ttm_bo_clean_mm(bdev, i)) {
1454 pr_err("DRM memory manager type %d is not clean\n",
1457 man->has_type = false;
1461 mutex_lock(&glob->device_list_mutex);
1462 list_del(&bdev->device_list);
1463 mutex_unlock(&glob->device_list_mutex);
1465 cancel_delayed_work_sync(&bdev->wq);
1467 while (ttm_bo_delayed_delete(bdev, true))
1470 spin_lock(&glob->lru_lock);
1471 if (list_empty(&bdev->ddestroy))
1472 TTM_DEBUG("Delayed destroy list was clean\n");
1474 if (list_empty(&bdev->man[0].lru))
1475 TTM_DEBUG("Swap list was clean\n");
1476 spin_unlock(&glob->lru_lock);
1478 drm_vma_offset_manager_destroy(&bdev->vma_manager);
1482 EXPORT_SYMBOL(ttm_bo_device_release);
1484 int ttm_bo_device_init(struct ttm_bo_device *bdev,
1485 struct ttm_bo_global *glob,
1486 struct ttm_bo_driver *driver,
1487 struct address_space *mapping,
1488 uint64_t file_page_offset,
1493 bdev->driver = driver;
1495 memset(bdev->man, 0, sizeof(bdev->man));
1498 * Initialize the system memory buffer type.
1499 * Other types need to be driver / IOCTL initialized.
1501 ret = ttm_bo_init_mm(bdev, TTM_PL_SYSTEM, 0);
1502 if (unlikely(ret != 0))
1505 drm_vma_offset_manager_init(&bdev->vma_manager, file_page_offset,
1507 INIT_DELAYED_WORK(&bdev->wq, ttm_bo_delayed_workqueue);
1508 INIT_LIST_HEAD(&bdev->ddestroy);
1509 bdev->dev_mapping = mapping;
1511 bdev->need_dma32 = need_dma32;
1513 mutex_lock(&glob->device_list_mutex);
1514 list_add_tail(&bdev->device_list, &glob->device_list);
1515 mutex_unlock(&glob->device_list_mutex);
1521 EXPORT_SYMBOL(ttm_bo_device_init);
1524 * buffer object vm functions.
1527 bool ttm_mem_reg_is_pci(struct ttm_bo_device *bdev, struct ttm_mem_reg *mem)
1529 struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
1531 if (!(man->flags & TTM_MEMTYPE_FLAG_FIXED)) {
1532 if (mem->mem_type == TTM_PL_SYSTEM)
1535 if (man->flags & TTM_MEMTYPE_FLAG_CMA)
1538 if (mem->placement & TTM_PL_FLAG_CACHED)
1544 void ttm_bo_unmap_virtual_locked(struct ttm_buffer_object *bo)
1546 struct ttm_bo_device *bdev = bo->bdev;
1548 drm_vma_node_unmap(&bo->vma_node, bdev->dev_mapping);
1549 ttm_mem_io_free_vm(bo);
1552 void ttm_bo_unmap_virtual(struct ttm_buffer_object *bo)
1554 struct ttm_bo_device *bdev = bo->bdev;
1555 struct ttm_mem_type_manager *man = &bdev->man[bo->mem.mem_type];
1557 ttm_mem_io_lock(man, false);
1558 ttm_bo_unmap_virtual_locked(bo);
1559 ttm_mem_io_unlock(man);
1563 EXPORT_SYMBOL(ttm_bo_unmap_virtual);
1565 int ttm_bo_wait(struct ttm_buffer_object *bo,
1566 bool lazy, bool interruptible, bool no_wait)
1568 struct reservation_object_list *fobj;
1569 struct reservation_object *resv;
1571 long timeout = 15 * HZ;
1575 fobj = reservation_object_get_list(resv);
1576 excl = reservation_object_get_excl(resv);
1578 if (!fence_is_signaled(excl)) {
1582 timeout = fence_wait_timeout(excl,
1583 interruptible, timeout);
1587 for (i = 0; fobj && timeout > 0 && i < fobj->shared_count; ++i) {
1588 struct fence *fence;
1589 fence = rcu_dereference_protected(fobj->shared[i],
1590 reservation_object_held(resv));
1592 if (!fence_is_signaled(fence)) {
1596 timeout = fence_wait_timeout(fence,
1597 interruptible, timeout);
1607 reservation_object_add_excl_fence(resv, NULL);
1608 clear_bit(TTM_BO_PRIV_FLAG_MOVING, &bo->priv_flags);
1611 EXPORT_SYMBOL(ttm_bo_wait);
1613 int ttm_bo_synccpu_write_grab(struct ttm_buffer_object *bo, bool no_wait)
1618 * Using ttm_bo_reserve makes sure the lru lists are updated.
1621 ret = ttm_bo_reserve(bo, true, no_wait, false, NULL);
1622 if (unlikely(ret != 0))
1624 ret = ttm_bo_wait(bo, false, true, no_wait);
1625 if (likely(ret == 0))
1626 atomic_inc(&bo->cpu_writers);
1627 ttm_bo_unreserve(bo);
1630 EXPORT_SYMBOL(ttm_bo_synccpu_write_grab);
1632 void ttm_bo_synccpu_write_release(struct ttm_buffer_object *bo)
1634 atomic_dec(&bo->cpu_writers);
1636 EXPORT_SYMBOL(ttm_bo_synccpu_write_release);
1639 * A buffer object shrink method that tries to swap out the first
1640 * buffer object on the bo_global::swap_lru list.
1643 static int ttm_bo_swapout(struct ttm_mem_shrink *shrink)
1645 struct ttm_bo_global *glob =
1646 container_of(shrink, struct ttm_bo_global, shrink);
1647 struct ttm_buffer_object *bo;
1650 uint32_t swap_placement = (TTM_PL_FLAG_CACHED | TTM_PL_FLAG_SYSTEM);
1652 spin_lock(&glob->lru_lock);
1653 list_for_each_entry(bo, &glob->swap_lru, swap) {
1654 ret = __ttm_bo_reserve(bo, false, true, false, NULL);
1660 spin_unlock(&glob->lru_lock);
1664 kref_get(&bo->list_kref);
1666 if (!list_empty(&bo->ddestroy)) {
1667 ret = ttm_bo_cleanup_refs_and_unlock(bo, false, false);
1668 kref_put(&bo->list_kref, ttm_bo_release_list);
1672 put_count = ttm_bo_del_from_lru(bo);
1673 spin_unlock(&glob->lru_lock);
1675 ttm_bo_list_ref_sub(bo, put_count, true);
1678 * Wait for GPU, then move to system cached.
1681 ret = ttm_bo_wait(bo, false, false, false);
1683 if (unlikely(ret != 0))
1686 if ((bo->mem.placement & swap_placement) != swap_placement) {
1687 struct ttm_mem_reg evict_mem;
1689 evict_mem = bo->mem;
1690 evict_mem.mm_node = NULL;
1691 evict_mem.placement = TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED;
1692 evict_mem.mem_type = TTM_PL_SYSTEM;
1694 ret = ttm_bo_handle_move_mem(bo, &evict_mem, true,
1696 if (unlikely(ret != 0))
1700 ttm_bo_unmap_virtual(bo);
1703 * Swap out. Buffer will be swapped in again as soon as
1704 * anyone tries to access a ttm page.
1707 if (bo->bdev->driver->swap_notify)
1708 bo->bdev->driver->swap_notify(bo);
1710 ret = ttm_tt_swapout(bo->ttm, bo->persistent_swap_storage);
1715 * Unreserve without putting on LRU to avoid swapping out an
1716 * already swapped buffer.
1719 __ttm_bo_unreserve(bo);
1720 kref_put(&bo->list_kref, ttm_bo_release_list);
1724 void ttm_bo_swapout_all(struct ttm_bo_device *bdev)
1726 while (ttm_bo_swapout(&bdev->glob->shrink) == 0)
1729 EXPORT_SYMBOL(ttm_bo_swapout_all);
1732 * ttm_bo_wait_unreserved - interruptible wait for a buffer object to become
1735 * @bo: Pointer to buffer
1737 int ttm_bo_wait_unreserved(struct ttm_buffer_object *bo)
1742 * In the absense of a wait_unlocked API,
1743 * Use the bo::wu_mutex to avoid triggering livelocks due to
1744 * concurrent use of this function. Note that this use of
1745 * bo::wu_mutex can go away if we change locking order to
1746 * mmap_sem -> bo::reserve.
1748 ret = mutex_lock_interruptible(&bo->wu_mutex);
1749 if (unlikely(ret != 0))
1750 return -ERESTARTSYS;
1751 if (!ww_mutex_is_locked(&bo->resv->lock))
1753 ret = __ttm_bo_reserve(bo, true, false, false, NULL);
1754 if (unlikely(ret != 0))
1756 __ttm_bo_unreserve(bo);
1759 mutex_unlock(&bo->wu_mutex);