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_setup_vm(struct ttm_buffer_object *bo);
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_flags(uint32_t flags, uint32_t *mem_type)
61 for (i = 0; i <= TTM_PL_PRIV5; i++)
62 if (flags & (1 << i)) {
69 static void ttm_mem_type_debug(struct ttm_bo_device *bdev, int mem_type)
71 struct ttm_mem_type_manager *man = &bdev->man[mem_type];
73 pr_err(" has_type: %d\n", man->has_type);
74 pr_err(" use_type: %d\n", man->use_type);
75 pr_err(" flags: 0x%08X\n", man->flags);
76 pr_err(" gpu_offset: 0x%08lX\n", man->gpu_offset);
77 pr_err(" size: %llu\n", man->size);
78 pr_err(" available_caching: 0x%08X\n", man->available_caching);
79 pr_err(" default_caching: 0x%08X\n", man->default_caching);
80 if (mem_type != TTM_PL_SYSTEM)
81 (*man->func->debug)(man, TTM_PFX);
84 static void ttm_bo_mem_space_debug(struct ttm_buffer_object *bo,
85 struct ttm_placement *placement)
89 pr_err("No space for %p (%lu pages, %luK, %luM)\n",
90 bo, bo->mem.num_pages, bo->mem.size >> 10,
92 for (i = 0; i < placement->num_placement; i++) {
93 ret = ttm_mem_type_from_flags(placement->placement[i],
97 pr_err(" placement[%d]=0x%08X (%d)\n",
98 i, placement->placement[i], mem_type);
99 ttm_mem_type_debug(bo->bdev, mem_type);
103 static ssize_t ttm_bo_global_show(struct kobject *kobj,
104 struct attribute *attr,
107 struct ttm_bo_global *glob =
108 container_of(kobj, struct ttm_bo_global, kobj);
110 return snprintf(buffer, PAGE_SIZE, "%lu\n",
111 (unsigned long) atomic_read(&glob->bo_count));
114 static struct attribute *ttm_bo_global_attrs[] = {
119 static const struct sysfs_ops ttm_bo_global_ops = {
120 .show = &ttm_bo_global_show
123 static struct kobj_type ttm_bo_glob_kobj_type = {
124 .release = &ttm_bo_global_kobj_release,
125 .sysfs_ops = &ttm_bo_global_ops,
126 .default_attrs = ttm_bo_global_attrs
130 static inline uint32_t ttm_bo_type_flags(unsigned type)
135 static void ttm_bo_release_list(struct kref *list_kref)
137 struct ttm_buffer_object *bo =
138 container_of(list_kref, struct ttm_buffer_object, list_kref);
139 struct ttm_bo_device *bdev = bo->bdev;
140 size_t acc_size = bo->acc_size;
142 BUG_ON(atomic_read(&bo->list_kref.refcount));
143 BUG_ON(atomic_read(&bo->kref.refcount));
144 BUG_ON(atomic_read(&bo->cpu_writers));
145 BUG_ON(bo->sync_obj != NULL);
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);
158 ttm_mem_global_free(bdev->glob->mem_glob, acc_size);
161 int ttm_bo_wait_unreserved(struct ttm_buffer_object *bo, bool interruptible)
164 return wait_event_interruptible(bo->event_queue,
165 !ttm_bo_is_reserved(bo));
167 wait_event(bo->event_queue, !ttm_bo_is_reserved(bo));
171 EXPORT_SYMBOL(ttm_bo_wait_unreserved);
173 void ttm_bo_add_to_lru(struct ttm_buffer_object *bo)
175 struct ttm_bo_device *bdev = bo->bdev;
176 struct ttm_mem_type_manager *man;
178 BUG_ON(!ttm_bo_is_reserved(bo));
180 if (!(bo->mem.placement & TTM_PL_FLAG_NO_EVICT)) {
182 BUG_ON(!list_empty(&bo->lru));
184 man = &bdev->man[bo->mem.mem_type];
185 list_add_tail(&bo->lru, &man->lru);
186 kref_get(&bo->list_kref);
188 if (bo->ttm != NULL) {
189 list_add_tail(&bo->swap, &bo->glob->swap_lru);
190 kref_get(&bo->list_kref);
195 int ttm_bo_del_from_lru(struct ttm_buffer_object *bo)
199 if (!list_empty(&bo->swap)) {
200 list_del_init(&bo->swap);
203 if (!list_empty(&bo->lru)) {
204 list_del_init(&bo->lru);
209 * TODO: Add a driver hook to delete from
210 * driver-specific LRU's here.
216 int ttm_bo_reserve_locked(struct ttm_buffer_object *bo,
218 bool no_wait, bool use_sequence, uint32_t sequence)
220 struct ttm_bo_global *glob = bo->glob;
223 while (unlikely(atomic_cmpxchg(&bo->reserved, 0, 1) != 0)) {
225 * Deadlock avoidance for multi-bo reserving.
227 if (use_sequence && bo->seq_valid) {
229 * We've already reserved this one.
231 if (unlikely(sequence == bo->val_seq))
234 * Already reserved by a thread that will not back
235 * off for us. We need to back off.
237 if (unlikely(sequence - bo->val_seq < (1 << 31)))
244 spin_unlock(&glob->lru_lock);
245 ret = ttm_bo_wait_unreserved(bo, interruptible);
246 spin_lock(&glob->lru_lock);
254 * Wake up waiters that may need to recheck for deadlock,
255 * if we decreased the sequence number.
257 if (unlikely((bo->val_seq - sequence < (1 << 31))
259 wake_up_all(&bo->event_queue);
261 bo->val_seq = sequence;
262 bo->seq_valid = true;
264 bo->seq_valid = false;
269 EXPORT_SYMBOL(ttm_bo_reserve);
271 static void ttm_bo_ref_bug(struct kref *list_kref)
276 void ttm_bo_list_ref_sub(struct ttm_buffer_object *bo, int count,
279 kref_sub(&bo->list_kref, count,
280 (never_free) ? ttm_bo_ref_bug : ttm_bo_release_list);
283 int ttm_bo_reserve(struct ttm_buffer_object *bo,
285 bool no_wait, bool use_sequence, uint32_t sequence)
287 struct ttm_bo_global *glob = bo->glob;
291 spin_lock(&glob->lru_lock);
292 ret = ttm_bo_reserve_locked(bo, interruptible, no_wait, use_sequence,
294 if (likely(ret == 0))
295 put_count = ttm_bo_del_from_lru(bo);
296 spin_unlock(&glob->lru_lock);
298 ttm_bo_list_ref_sub(bo, put_count, true);
303 void ttm_bo_unreserve_locked(struct ttm_buffer_object *bo)
305 ttm_bo_add_to_lru(bo);
306 atomic_set(&bo->reserved, 0);
307 wake_up_all(&bo->event_queue);
310 void ttm_bo_unreserve(struct ttm_buffer_object *bo)
312 struct ttm_bo_global *glob = bo->glob;
314 spin_lock(&glob->lru_lock);
315 ttm_bo_unreserve_locked(bo);
316 spin_unlock(&glob->lru_lock);
318 EXPORT_SYMBOL(ttm_bo_unreserve);
321 * Call bo->mutex locked.
323 static int ttm_bo_add_ttm(struct ttm_buffer_object *bo, bool zero_alloc)
325 struct ttm_bo_device *bdev = bo->bdev;
326 struct ttm_bo_global *glob = bo->glob;
328 uint32_t page_flags = 0;
330 TTM_ASSERT_LOCKED(&bo->mutex);
333 if (bdev->need_dma32)
334 page_flags |= TTM_PAGE_FLAG_DMA32;
337 case ttm_bo_type_device:
339 page_flags |= TTM_PAGE_FLAG_ZERO_ALLOC;
340 case ttm_bo_type_kernel:
341 bo->ttm = bdev->driver->ttm_tt_create(bdev, bo->num_pages << PAGE_SHIFT,
342 page_flags, glob->dummy_read_page);
343 if (unlikely(bo->ttm == NULL))
347 bo->ttm = bdev->driver->ttm_tt_create(bdev, bo->num_pages << PAGE_SHIFT,
348 page_flags | TTM_PAGE_FLAG_SG,
349 glob->dummy_read_page);
350 if (unlikely(bo->ttm == NULL)) {
354 bo->ttm->sg = bo->sg;
357 pr_err("Illegal buffer object type\n");
365 static int ttm_bo_handle_move_mem(struct ttm_buffer_object *bo,
366 struct ttm_mem_reg *mem,
367 bool evict, bool interruptible,
368 bool no_wait_reserve, bool no_wait_gpu)
370 struct ttm_bo_device *bdev = bo->bdev;
371 bool old_is_pci = ttm_mem_reg_is_pci(bdev, &bo->mem);
372 bool new_is_pci = ttm_mem_reg_is_pci(bdev, mem);
373 struct ttm_mem_type_manager *old_man = &bdev->man[bo->mem.mem_type];
374 struct ttm_mem_type_manager *new_man = &bdev->man[mem->mem_type];
377 if (old_is_pci || new_is_pci ||
378 ((mem->placement & bo->mem.placement & TTM_PL_MASK_CACHING) == 0)) {
379 ret = ttm_mem_io_lock(old_man, true);
380 if (unlikely(ret != 0))
382 ttm_bo_unmap_virtual_locked(bo);
383 ttm_mem_io_unlock(old_man);
387 * Create and bind a ttm if required.
390 if (!(new_man->flags & TTM_MEMTYPE_FLAG_FIXED)) {
391 if (bo->ttm == NULL) {
392 bool zero = !(old_man->flags & TTM_MEMTYPE_FLAG_FIXED);
393 ret = ttm_bo_add_ttm(bo, zero);
398 ret = ttm_tt_set_placement_caching(bo->ttm, mem->placement);
402 if (mem->mem_type != TTM_PL_SYSTEM) {
403 ret = ttm_tt_bind(bo->ttm, mem);
408 if (bo->mem.mem_type == TTM_PL_SYSTEM) {
409 if (bdev->driver->move_notify)
410 bdev->driver->move_notify(bo, mem);
417 if (bdev->driver->move_notify)
418 bdev->driver->move_notify(bo, mem);
420 if (!(old_man->flags & TTM_MEMTYPE_FLAG_FIXED) &&
421 !(new_man->flags & TTM_MEMTYPE_FLAG_FIXED))
422 ret = ttm_bo_move_ttm(bo, evict, no_wait_reserve, no_wait_gpu, mem);
423 else if (bdev->driver->move)
424 ret = bdev->driver->move(bo, evict, interruptible,
425 no_wait_reserve, no_wait_gpu, mem);
427 ret = ttm_bo_move_memcpy(bo, evict, no_wait_reserve, no_wait_gpu, mem);
430 if (bdev->driver->move_notify) {
431 struct ttm_mem_reg tmp_mem = *mem;
434 bdev->driver->move_notify(bo, mem);
443 ret = bdev->driver->invalidate_caches(bdev, bo->mem.placement);
445 pr_err("Can not flush read caches\n");
449 if (bo->mem.mm_node) {
450 bo->offset = (bo->mem.start << PAGE_SHIFT) +
451 bdev->man[bo->mem.mem_type].gpu_offset;
452 bo->cur_placement = bo->mem.placement;
459 new_man = &bdev->man[bo->mem.mem_type];
460 if ((new_man->flags & TTM_MEMTYPE_FLAG_FIXED) && bo->ttm) {
461 ttm_tt_unbind(bo->ttm);
462 ttm_tt_destroy(bo->ttm);
471 * Will release GPU memory type usage on destruction.
472 * This is the place to put in driver specific hooks to release
473 * driver private resources.
474 * Will release the bo::reserved lock.
477 static void ttm_bo_cleanup_memtype_use(struct ttm_buffer_object *bo)
479 if (bo->bdev->driver->move_notify)
480 bo->bdev->driver->move_notify(bo, NULL);
483 ttm_tt_unbind(bo->ttm);
484 ttm_tt_destroy(bo->ttm);
487 ttm_bo_mem_put(bo, &bo->mem);
489 atomic_set(&bo->reserved, 0);
492 * Make processes trying to reserve really pick it up.
494 smp_mb__after_atomic_dec();
495 wake_up_all(&bo->event_queue);
498 static void ttm_bo_cleanup_refs_or_queue(struct ttm_buffer_object *bo)
500 struct ttm_bo_device *bdev = bo->bdev;
501 struct ttm_bo_global *glob = bo->glob;
502 struct ttm_bo_driver *driver;
503 void *sync_obj = NULL;
508 spin_lock(&bdev->fence_lock);
509 (void) ttm_bo_wait(bo, false, false, true);
512 spin_lock(&glob->lru_lock);
515 * Lock inversion between bo:reserve and bdev::fence_lock here,
516 * but that's OK, since we're only trylocking.
519 ret = ttm_bo_reserve_locked(bo, false, true, false, 0);
521 if (unlikely(ret == -EBUSY))
524 spin_unlock(&bdev->fence_lock);
525 put_count = ttm_bo_del_from_lru(bo);
527 spin_unlock(&glob->lru_lock);
528 ttm_bo_cleanup_memtype_use(bo);
530 ttm_bo_list_ref_sub(bo, put_count, true);
534 spin_lock(&glob->lru_lock);
537 driver = bdev->driver;
539 sync_obj = driver->sync_obj_ref(bo->sync_obj);
540 sync_obj_arg = bo->sync_obj_arg;
542 kref_get(&bo->list_kref);
543 list_add_tail(&bo->ddestroy, &bdev->ddestroy);
544 spin_unlock(&glob->lru_lock);
545 spin_unlock(&bdev->fence_lock);
548 driver->sync_obj_flush(sync_obj, sync_obj_arg);
549 driver->sync_obj_unref(&sync_obj);
551 schedule_delayed_work(&bdev->wq,
552 ((HZ / 100) < 1) ? 1 : HZ / 100);
556 * function ttm_bo_cleanup_refs
557 * If bo idle, remove from delayed- and lru lists, and unref.
558 * If not idle, do nothing.
560 * @interruptible Any sleeps should occur interruptibly.
561 * @no_wait_reserve Never wait for reserve. Return -EBUSY instead.
562 * @no_wait_gpu Never wait for gpu. Return -EBUSY instead.
565 static int ttm_bo_cleanup_refs(struct ttm_buffer_object *bo,
567 bool no_wait_reserve,
570 struct ttm_bo_device *bdev = bo->bdev;
571 struct ttm_bo_global *glob = bo->glob;
576 spin_lock(&bdev->fence_lock);
577 ret = ttm_bo_wait(bo, false, interruptible, no_wait_gpu);
578 spin_unlock(&bdev->fence_lock);
580 if (unlikely(ret != 0))
584 spin_lock(&glob->lru_lock);
586 if (unlikely(list_empty(&bo->ddestroy))) {
587 spin_unlock(&glob->lru_lock);
591 ret = ttm_bo_reserve_locked(bo, false, true, false, 0);
593 if (unlikely(ret == -EBUSY)) {
594 spin_unlock(&glob->lru_lock);
595 if (likely(!no_wait_reserve))
596 ret = ttm_bo_wait_unreserved(bo, interruptible);
597 if (unlikely(ret != 0))
606 * We can re-check for sync object without taking
607 * the bo::lock since setting the sync object requires
608 * also bo::reserved. A busy object at this point may
609 * be caused by another thread recently starting an accelerated
613 if (unlikely(bo->sync_obj)) {
614 atomic_set(&bo->reserved, 0);
615 wake_up_all(&bo->event_queue);
616 spin_unlock(&glob->lru_lock);
620 put_count = ttm_bo_del_from_lru(bo);
621 list_del_init(&bo->ddestroy);
624 spin_unlock(&glob->lru_lock);
625 ttm_bo_cleanup_memtype_use(bo);
627 ttm_bo_list_ref_sub(bo, put_count, true);
633 * Traverse the delayed list, and call ttm_bo_cleanup_refs on all
634 * encountered buffers.
637 static int ttm_bo_delayed_delete(struct ttm_bo_device *bdev, bool remove_all)
639 struct ttm_bo_global *glob = bdev->glob;
640 struct ttm_buffer_object *entry = NULL;
643 spin_lock(&glob->lru_lock);
644 if (list_empty(&bdev->ddestroy))
647 entry = list_first_entry(&bdev->ddestroy,
648 struct ttm_buffer_object, ddestroy);
649 kref_get(&entry->list_kref);
652 struct ttm_buffer_object *nentry = NULL;
654 if (entry->ddestroy.next != &bdev->ddestroy) {
655 nentry = list_first_entry(&entry->ddestroy,
656 struct ttm_buffer_object, ddestroy);
657 kref_get(&nentry->list_kref);
660 spin_unlock(&glob->lru_lock);
661 ret = ttm_bo_cleanup_refs(entry, false, !remove_all,
663 kref_put(&entry->list_kref, ttm_bo_release_list);
669 spin_lock(&glob->lru_lock);
670 if (list_empty(&entry->ddestroy))
675 spin_unlock(&glob->lru_lock);
678 kref_put(&entry->list_kref, ttm_bo_release_list);
682 static void ttm_bo_delayed_workqueue(struct work_struct *work)
684 struct ttm_bo_device *bdev =
685 container_of(work, struct ttm_bo_device, wq.work);
687 if (ttm_bo_delayed_delete(bdev, false)) {
688 schedule_delayed_work(&bdev->wq,
689 ((HZ / 100) < 1) ? 1 : HZ / 100);
693 static void ttm_bo_release(struct kref *kref)
695 struct ttm_buffer_object *bo =
696 container_of(kref, struct ttm_buffer_object, kref);
697 struct ttm_bo_device *bdev = bo->bdev;
698 struct ttm_mem_type_manager *man = &bdev->man[bo->mem.mem_type];
700 if (likely(bo->vm_node != NULL)) {
701 rb_erase(&bo->vm_rb, &bdev->addr_space_rb);
702 drm_mm_put_block(bo->vm_node);
705 write_unlock(&bdev->vm_lock);
706 ttm_mem_io_lock(man, false);
707 ttm_mem_io_free_vm(bo);
708 ttm_mem_io_unlock(man);
709 ttm_bo_cleanup_refs_or_queue(bo);
710 kref_put(&bo->list_kref, ttm_bo_release_list);
711 write_lock(&bdev->vm_lock);
714 void ttm_bo_unref(struct ttm_buffer_object **p_bo)
716 struct ttm_buffer_object *bo = *p_bo;
717 struct ttm_bo_device *bdev = bo->bdev;
720 write_lock(&bdev->vm_lock);
721 kref_put(&bo->kref, ttm_bo_release);
722 write_unlock(&bdev->vm_lock);
724 EXPORT_SYMBOL(ttm_bo_unref);
726 int ttm_bo_lock_delayed_workqueue(struct ttm_bo_device *bdev)
728 return cancel_delayed_work_sync(&bdev->wq);
730 EXPORT_SYMBOL(ttm_bo_lock_delayed_workqueue);
732 void ttm_bo_unlock_delayed_workqueue(struct ttm_bo_device *bdev, int resched)
735 schedule_delayed_work(&bdev->wq,
736 ((HZ / 100) < 1) ? 1 : HZ / 100);
738 EXPORT_SYMBOL(ttm_bo_unlock_delayed_workqueue);
740 static int ttm_bo_evict(struct ttm_buffer_object *bo, bool interruptible,
741 bool no_wait_reserve, bool no_wait_gpu)
743 struct ttm_bo_device *bdev = bo->bdev;
744 struct ttm_mem_reg evict_mem;
745 struct ttm_placement placement;
748 spin_lock(&bdev->fence_lock);
749 ret = ttm_bo_wait(bo, false, interruptible, no_wait_gpu);
750 spin_unlock(&bdev->fence_lock);
752 if (unlikely(ret != 0)) {
753 if (ret != -ERESTARTSYS) {
754 pr_err("Failed to expire sync object before buffer eviction\n");
759 BUG_ON(!ttm_bo_is_reserved(bo));
762 evict_mem.mm_node = NULL;
763 evict_mem.bus.io_reserved_vm = false;
764 evict_mem.bus.io_reserved_count = 0;
768 placement.num_placement = 0;
769 placement.num_busy_placement = 0;
770 bdev->driver->evict_flags(bo, &placement);
771 ret = ttm_bo_mem_space(bo, &placement, &evict_mem, interruptible,
772 no_wait_reserve, no_wait_gpu);
774 if (ret != -ERESTARTSYS) {
775 pr_err("Failed to find memory space for buffer 0x%p eviction\n",
777 ttm_bo_mem_space_debug(bo, &placement);
782 ret = ttm_bo_handle_move_mem(bo, &evict_mem, true, interruptible,
783 no_wait_reserve, no_wait_gpu);
785 if (ret != -ERESTARTSYS)
786 pr_err("Buffer eviction failed\n");
787 ttm_bo_mem_put(bo, &evict_mem);
795 static int ttm_mem_evict_first(struct ttm_bo_device *bdev,
797 bool interruptible, bool no_wait_reserve,
800 struct ttm_bo_global *glob = bdev->glob;
801 struct ttm_mem_type_manager *man = &bdev->man[mem_type];
802 struct ttm_buffer_object *bo;
803 int ret, put_count = 0;
806 spin_lock(&glob->lru_lock);
807 if (list_empty(&man->lru)) {
808 spin_unlock(&glob->lru_lock);
812 bo = list_first_entry(&man->lru, struct ttm_buffer_object, lru);
813 kref_get(&bo->list_kref);
815 if (!list_empty(&bo->ddestroy)) {
816 spin_unlock(&glob->lru_lock);
817 ret = ttm_bo_cleanup_refs(bo, interruptible,
818 no_wait_reserve, no_wait_gpu);
819 kref_put(&bo->list_kref, ttm_bo_release_list);
824 ret = ttm_bo_reserve_locked(bo, false, true, false, 0);
826 if (unlikely(ret == -EBUSY)) {
827 spin_unlock(&glob->lru_lock);
828 if (likely(!no_wait_reserve))
829 ret = ttm_bo_wait_unreserved(bo, interruptible);
831 kref_put(&bo->list_kref, ttm_bo_release_list);
834 * We *need* to retry after releasing the lru lock.
837 if (unlikely(ret != 0))
842 put_count = ttm_bo_del_from_lru(bo);
843 spin_unlock(&glob->lru_lock);
847 ttm_bo_list_ref_sub(bo, put_count, true);
849 ret = ttm_bo_evict(bo, interruptible, no_wait_reserve, no_wait_gpu);
850 ttm_bo_unreserve(bo);
852 kref_put(&bo->list_kref, ttm_bo_release_list);
856 void ttm_bo_mem_put(struct ttm_buffer_object *bo, struct ttm_mem_reg *mem)
858 struct ttm_mem_type_manager *man = &bo->bdev->man[mem->mem_type];
861 (*man->func->put_node)(man, mem);
863 EXPORT_SYMBOL(ttm_bo_mem_put);
866 * Repeatedly evict memory from the LRU for @mem_type until we create enough
867 * space, or we've evicted everything and there isn't enough space.
869 static int ttm_bo_mem_force_space(struct ttm_buffer_object *bo,
871 struct ttm_placement *placement,
872 struct ttm_mem_reg *mem,
874 bool no_wait_reserve,
877 struct ttm_bo_device *bdev = bo->bdev;
878 struct ttm_mem_type_manager *man = &bdev->man[mem_type];
882 ret = (*man->func->get_node)(man, bo, placement, mem);
883 if (unlikely(ret != 0))
887 ret = ttm_mem_evict_first(bdev, mem_type, interruptible,
888 no_wait_reserve, no_wait_gpu);
889 if (unlikely(ret != 0))
892 if (mem->mm_node == NULL)
894 mem->mem_type = mem_type;
898 static uint32_t ttm_bo_select_caching(struct ttm_mem_type_manager *man,
899 uint32_t cur_placement,
900 uint32_t proposed_placement)
902 uint32_t caching = proposed_placement & TTM_PL_MASK_CACHING;
903 uint32_t result = proposed_placement & ~TTM_PL_MASK_CACHING;
906 * Keep current caching if possible.
909 if ((cur_placement & caching) != 0)
910 result |= (cur_placement & caching);
911 else if ((man->default_caching & caching) != 0)
912 result |= man->default_caching;
913 else if ((TTM_PL_FLAG_CACHED & caching) != 0)
914 result |= TTM_PL_FLAG_CACHED;
915 else if ((TTM_PL_FLAG_WC & caching) != 0)
916 result |= TTM_PL_FLAG_WC;
917 else if ((TTM_PL_FLAG_UNCACHED & caching) != 0)
918 result |= TTM_PL_FLAG_UNCACHED;
923 static bool ttm_bo_mt_compatible(struct ttm_mem_type_manager *man,
925 uint32_t proposed_placement,
926 uint32_t *masked_placement)
928 uint32_t cur_flags = ttm_bo_type_flags(mem_type);
930 if ((cur_flags & proposed_placement & TTM_PL_MASK_MEM) == 0)
933 if ((proposed_placement & man->available_caching) == 0)
936 cur_flags |= (proposed_placement & man->available_caching);
938 *masked_placement = cur_flags;
943 * Creates space for memory region @mem according to its type.
945 * This function first searches for free space in compatible memory types in
946 * the priority order defined by the driver. If free space isn't found, then
947 * ttm_bo_mem_force_space is attempted in priority order to evict and find
950 int ttm_bo_mem_space(struct ttm_buffer_object *bo,
951 struct ttm_placement *placement,
952 struct ttm_mem_reg *mem,
953 bool interruptible, bool no_wait_reserve,
956 struct ttm_bo_device *bdev = bo->bdev;
957 struct ttm_mem_type_manager *man;
958 uint32_t mem_type = TTM_PL_SYSTEM;
959 uint32_t cur_flags = 0;
960 bool type_found = false;
961 bool type_ok = false;
962 bool has_erestartsys = false;
966 for (i = 0; i < placement->num_placement; ++i) {
967 ret = ttm_mem_type_from_flags(placement->placement[i],
971 man = &bdev->man[mem_type];
973 type_ok = ttm_bo_mt_compatible(man,
975 placement->placement[i],
981 cur_flags = ttm_bo_select_caching(man, bo->mem.placement,
984 * Use the access and other non-mapping-related flag bits from
985 * the memory placement flags to the current flags
987 ttm_flag_masked(&cur_flags, placement->placement[i],
988 ~TTM_PL_MASK_MEMTYPE);
990 if (mem_type == TTM_PL_SYSTEM)
993 if (man->has_type && man->use_type) {
995 ret = (*man->func->get_node)(man, bo, placement, mem);
1003 if ((type_ok && (mem_type == TTM_PL_SYSTEM)) || mem->mm_node) {
1004 mem->mem_type = mem_type;
1005 mem->placement = cur_flags;
1012 for (i = 0; i < placement->num_busy_placement; ++i) {
1013 ret = ttm_mem_type_from_flags(placement->busy_placement[i],
1017 man = &bdev->man[mem_type];
1020 if (!ttm_bo_mt_compatible(man,
1022 placement->busy_placement[i],
1026 cur_flags = ttm_bo_select_caching(man, bo->mem.placement,
1029 * Use the access and other non-mapping-related flag bits from
1030 * the memory placement flags to the current flags
1032 ttm_flag_masked(&cur_flags, placement->busy_placement[i],
1033 ~TTM_PL_MASK_MEMTYPE);
1036 if (mem_type == TTM_PL_SYSTEM) {
1037 mem->mem_type = mem_type;
1038 mem->placement = cur_flags;
1039 mem->mm_node = NULL;
1043 ret = ttm_bo_mem_force_space(bo, mem_type, placement, mem,
1044 interruptible, no_wait_reserve, no_wait_gpu);
1045 if (ret == 0 && mem->mm_node) {
1046 mem->placement = cur_flags;
1049 if (ret == -ERESTARTSYS)
1050 has_erestartsys = true;
1052 ret = (has_erestartsys) ? -ERESTARTSYS : -ENOMEM;
1055 EXPORT_SYMBOL(ttm_bo_mem_space);
1057 int ttm_bo_wait_cpu(struct ttm_buffer_object *bo, bool no_wait)
1059 if ((atomic_read(&bo->cpu_writers) > 0) && no_wait)
1062 return wait_event_interruptible(bo->event_queue,
1063 atomic_read(&bo->cpu_writers) == 0);
1065 EXPORT_SYMBOL(ttm_bo_wait_cpu);
1067 int ttm_bo_move_buffer(struct ttm_buffer_object *bo,
1068 struct ttm_placement *placement,
1069 bool interruptible, bool no_wait_reserve,
1073 struct ttm_mem_reg mem;
1074 struct ttm_bo_device *bdev = bo->bdev;
1076 BUG_ON(!ttm_bo_is_reserved(bo));
1079 * FIXME: It's possible to pipeline buffer moves.
1080 * Have the driver move function wait for idle when necessary,
1081 * instead of doing it here.
1083 spin_lock(&bdev->fence_lock);
1084 ret = ttm_bo_wait(bo, false, interruptible, no_wait_gpu);
1085 spin_unlock(&bdev->fence_lock);
1088 mem.num_pages = bo->num_pages;
1089 mem.size = mem.num_pages << PAGE_SHIFT;
1090 mem.page_alignment = bo->mem.page_alignment;
1091 mem.bus.io_reserved_vm = false;
1092 mem.bus.io_reserved_count = 0;
1094 * Determine where to move the buffer.
1096 ret = ttm_bo_mem_space(bo, placement, &mem, interruptible, no_wait_reserve, no_wait_gpu);
1099 ret = ttm_bo_handle_move_mem(bo, &mem, false, interruptible, no_wait_reserve, no_wait_gpu);
1101 if (ret && mem.mm_node)
1102 ttm_bo_mem_put(bo, &mem);
1106 static int ttm_bo_mem_compat(struct ttm_placement *placement,
1107 struct ttm_mem_reg *mem)
1111 if (mem->mm_node && placement->lpfn != 0 &&
1112 (mem->start < placement->fpfn ||
1113 mem->start + mem->num_pages > placement->lpfn))
1116 for (i = 0; i < placement->num_placement; i++) {
1117 if ((placement->placement[i] & mem->placement &
1118 TTM_PL_MASK_CACHING) &&
1119 (placement->placement[i] & mem->placement &
1126 int ttm_bo_validate(struct ttm_buffer_object *bo,
1127 struct ttm_placement *placement,
1128 bool interruptible, bool no_wait_reserve,
1133 BUG_ON(!ttm_bo_is_reserved(bo));
1134 /* Check that range is valid */
1135 if (placement->lpfn || placement->fpfn)
1136 if (placement->fpfn > placement->lpfn ||
1137 (placement->lpfn - placement->fpfn) < bo->num_pages)
1140 * Check whether we need to move buffer.
1142 ret = ttm_bo_mem_compat(placement, &bo->mem);
1144 ret = ttm_bo_move_buffer(bo, placement, interruptible, no_wait_reserve, no_wait_gpu);
1149 * Use the access and other non-mapping-related flag bits from
1150 * the compatible memory placement flags to the active flags
1152 ttm_flag_masked(&bo->mem.placement, placement->placement[ret],
1153 ~TTM_PL_MASK_MEMTYPE);
1156 * We might need to add a TTM.
1158 if (bo->mem.mem_type == TTM_PL_SYSTEM && bo->ttm == NULL) {
1159 ret = ttm_bo_add_ttm(bo, true);
1165 EXPORT_SYMBOL(ttm_bo_validate);
1167 int ttm_bo_check_placement(struct ttm_buffer_object *bo,
1168 struct ttm_placement *placement)
1170 BUG_ON((placement->fpfn || placement->lpfn) &&
1171 (bo->mem.num_pages > (placement->lpfn - placement->fpfn)));
1176 int ttm_bo_init(struct ttm_bo_device *bdev,
1177 struct ttm_buffer_object *bo,
1179 enum ttm_bo_type type,
1180 struct ttm_placement *placement,
1181 uint32_t page_alignment,
1182 unsigned long buffer_start,
1184 struct file *persistent_swap_storage,
1186 struct sg_table *sg,
1187 void (*destroy) (struct ttm_buffer_object *))
1190 unsigned long num_pages;
1191 struct ttm_mem_global *mem_glob = bdev->glob->mem_glob;
1193 ret = ttm_mem_global_alloc(mem_glob, acc_size, false, false);
1195 pr_err("Out of kernel memory\n");
1203 size += buffer_start & ~PAGE_MASK;
1204 num_pages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
1205 if (num_pages == 0) {
1206 pr_err("Illegal buffer object size\n");
1211 ttm_mem_global_free(mem_glob, acc_size);
1214 bo->destroy = destroy;
1216 kref_init(&bo->kref);
1217 kref_init(&bo->list_kref);
1218 atomic_set(&bo->cpu_writers, 0);
1219 atomic_set(&bo->reserved, 1);
1220 init_waitqueue_head(&bo->event_queue);
1221 INIT_LIST_HEAD(&bo->lru);
1222 INIT_LIST_HEAD(&bo->ddestroy);
1223 INIT_LIST_HEAD(&bo->swap);
1224 INIT_LIST_HEAD(&bo->io_reserve_lru);
1226 bo->glob = bdev->glob;
1228 bo->num_pages = num_pages;
1229 bo->mem.size = num_pages << PAGE_SHIFT;
1230 bo->mem.mem_type = TTM_PL_SYSTEM;
1231 bo->mem.num_pages = bo->num_pages;
1232 bo->mem.mm_node = NULL;
1233 bo->mem.page_alignment = page_alignment;
1234 bo->mem.bus.io_reserved_vm = false;
1235 bo->mem.bus.io_reserved_count = 0;
1236 bo->buffer_start = buffer_start & PAGE_MASK;
1238 bo->mem.placement = (TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED);
1239 bo->seq_valid = false;
1240 bo->persistent_swap_storage = persistent_swap_storage;
1241 bo->acc_size = acc_size;
1243 atomic_inc(&bo->glob->bo_count);
1245 ret = ttm_bo_check_placement(bo, placement);
1246 if (unlikely(ret != 0))
1250 * For ttm_bo_type_device buffers, allocate
1251 * address space from the device.
1253 if (bo->type == ttm_bo_type_device ||
1254 bo->type == ttm_bo_type_sg) {
1255 ret = ttm_bo_setup_vm(bo);
1260 ret = ttm_bo_validate(bo, placement, interruptible, false, false);
1264 ttm_bo_unreserve(bo);
1268 ttm_bo_unreserve(bo);
1273 EXPORT_SYMBOL(ttm_bo_init);
1275 size_t ttm_bo_acc_size(struct ttm_bo_device *bdev,
1276 unsigned long bo_size,
1277 unsigned struct_size)
1279 unsigned npages = (PAGE_ALIGN(bo_size)) >> PAGE_SHIFT;
1282 size += ttm_round_pot(struct_size);
1283 size += PAGE_ALIGN(npages * sizeof(void *));
1284 size += ttm_round_pot(sizeof(struct ttm_tt));
1287 EXPORT_SYMBOL(ttm_bo_acc_size);
1289 size_t ttm_bo_dma_acc_size(struct ttm_bo_device *bdev,
1290 unsigned long bo_size,
1291 unsigned struct_size)
1293 unsigned npages = (PAGE_ALIGN(bo_size)) >> PAGE_SHIFT;
1296 size += ttm_round_pot(struct_size);
1297 size += PAGE_ALIGN(npages * sizeof(void *));
1298 size += PAGE_ALIGN(npages * sizeof(dma_addr_t));
1299 size += ttm_round_pot(sizeof(struct ttm_dma_tt));
1302 EXPORT_SYMBOL(ttm_bo_dma_acc_size);
1304 int ttm_bo_create(struct ttm_bo_device *bdev,
1306 enum ttm_bo_type type,
1307 struct ttm_placement *placement,
1308 uint32_t page_alignment,
1309 unsigned long buffer_start,
1311 struct file *persistent_swap_storage,
1312 struct ttm_buffer_object **p_bo)
1314 struct ttm_buffer_object *bo;
1318 bo = kzalloc(sizeof(*bo), GFP_KERNEL);
1319 if (unlikely(bo == NULL))
1322 acc_size = ttm_bo_acc_size(bdev, size, sizeof(struct ttm_buffer_object));
1323 ret = ttm_bo_init(bdev, bo, size, type, placement, page_alignment,
1324 buffer_start, interruptible,
1325 persistent_swap_storage, acc_size, NULL, NULL);
1326 if (likely(ret == 0))
1331 EXPORT_SYMBOL(ttm_bo_create);
1333 static int ttm_bo_force_list_clean(struct ttm_bo_device *bdev,
1334 unsigned mem_type, bool allow_errors)
1336 struct ttm_mem_type_manager *man = &bdev->man[mem_type];
1337 struct ttm_bo_global *glob = bdev->glob;
1341 * Can't use standard list traversal since we're unlocking.
1344 spin_lock(&glob->lru_lock);
1345 while (!list_empty(&man->lru)) {
1346 spin_unlock(&glob->lru_lock);
1347 ret = ttm_mem_evict_first(bdev, mem_type, false, false, false);
1352 pr_err("Cleanup eviction failed\n");
1355 spin_lock(&glob->lru_lock);
1357 spin_unlock(&glob->lru_lock);
1361 int ttm_bo_clean_mm(struct ttm_bo_device *bdev, unsigned mem_type)
1363 struct ttm_mem_type_manager *man;
1366 if (mem_type >= TTM_NUM_MEM_TYPES) {
1367 pr_err("Illegal memory type %d\n", mem_type);
1370 man = &bdev->man[mem_type];
1372 if (!man->has_type) {
1373 pr_err("Trying to take down uninitialized memory manager type %u\n",
1378 man->use_type = false;
1379 man->has_type = false;
1383 ttm_bo_force_list_clean(bdev, mem_type, false);
1385 ret = (*man->func->takedown)(man);
1390 EXPORT_SYMBOL(ttm_bo_clean_mm);
1392 int ttm_bo_evict_mm(struct ttm_bo_device *bdev, unsigned mem_type)
1394 struct ttm_mem_type_manager *man = &bdev->man[mem_type];
1396 if (mem_type == 0 || mem_type >= TTM_NUM_MEM_TYPES) {
1397 pr_err("Illegal memory manager memory type %u\n", mem_type);
1401 if (!man->has_type) {
1402 pr_err("Memory type %u has not been initialized\n", mem_type);
1406 return ttm_bo_force_list_clean(bdev, mem_type, true);
1408 EXPORT_SYMBOL(ttm_bo_evict_mm);
1410 int ttm_bo_init_mm(struct ttm_bo_device *bdev, unsigned type,
1411 unsigned long p_size)
1414 struct ttm_mem_type_manager *man;
1416 BUG_ON(type >= TTM_NUM_MEM_TYPES);
1417 man = &bdev->man[type];
1418 BUG_ON(man->has_type);
1419 man->io_reserve_fastpath = true;
1420 man->use_io_reserve_lru = false;
1421 mutex_init(&man->io_reserve_mutex);
1422 INIT_LIST_HEAD(&man->io_reserve_lru);
1424 ret = bdev->driver->init_mem_type(bdev, type, man);
1430 if (type != TTM_PL_SYSTEM) {
1431 ret = (*man->func->init)(man, p_size);
1435 man->has_type = true;
1436 man->use_type = true;
1439 INIT_LIST_HEAD(&man->lru);
1443 EXPORT_SYMBOL(ttm_bo_init_mm);
1445 static void ttm_bo_global_kobj_release(struct kobject *kobj)
1447 struct ttm_bo_global *glob =
1448 container_of(kobj, struct ttm_bo_global, kobj);
1450 ttm_mem_unregister_shrink(glob->mem_glob, &glob->shrink);
1451 __free_page(glob->dummy_read_page);
1455 void ttm_bo_global_release(struct drm_global_reference *ref)
1457 struct ttm_bo_global *glob = ref->object;
1459 kobject_del(&glob->kobj);
1460 kobject_put(&glob->kobj);
1462 EXPORT_SYMBOL(ttm_bo_global_release);
1464 int ttm_bo_global_init(struct drm_global_reference *ref)
1466 struct ttm_bo_global_ref *bo_ref =
1467 container_of(ref, struct ttm_bo_global_ref, ref);
1468 struct ttm_bo_global *glob = ref->object;
1471 mutex_init(&glob->device_list_mutex);
1472 spin_lock_init(&glob->lru_lock);
1473 glob->mem_glob = bo_ref->mem_glob;
1474 glob->dummy_read_page = alloc_page(__GFP_ZERO | GFP_DMA32);
1476 if (unlikely(glob->dummy_read_page == NULL)) {
1481 INIT_LIST_HEAD(&glob->swap_lru);
1482 INIT_LIST_HEAD(&glob->device_list);
1484 ttm_mem_init_shrink(&glob->shrink, ttm_bo_swapout);
1485 ret = ttm_mem_register_shrink(glob->mem_glob, &glob->shrink);
1486 if (unlikely(ret != 0)) {
1487 pr_err("Could not register buffer object swapout\n");
1491 atomic_set(&glob->bo_count, 0);
1493 ret = kobject_init_and_add(
1494 &glob->kobj, &ttm_bo_glob_kobj_type, ttm_get_kobj(), "buffer_objects");
1495 if (unlikely(ret != 0))
1496 kobject_put(&glob->kobj);
1499 __free_page(glob->dummy_read_page);
1504 EXPORT_SYMBOL(ttm_bo_global_init);
1507 int ttm_bo_device_release(struct ttm_bo_device *bdev)
1510 unsigned i = TTM_NUM_MEM_TYPES;
1511 struct ttm_mem_type_manager *man;
1512 struct ttm_bo_global *glob = bdev->glob;
1515 man = &bdev->man[i];
1516 if (man->has_type) {
1517 man->use_type = false;
1518 if ((i != TTM_PL_SYSTEM) && ttm_bo_clean_mm(bdev, i)) {
1520 pr_err("DRM memory manager type %d is not clean\n",
1523 man->has_type = false;
1527 mutex_lock(&glob->device_list_mutex);
1528 list_del(&bdev->device_list);
1529 mutex_unlock(&glob->device_list_mutex);
1531 cancel_delayed_work_sync(&bdev->wq);
1533 while (ttm_bo_delayed_delete(bdev, true))
1536 spin_lock(&glob->lru_lock);
1537 if (list_empty(&bdev->ddestroy))
1538 TTM_DEBUG("Delayed destroy list was clean\n");
1540 if (list_empty(&bdev->man[0].lru))
1541 TTM_DEBUG("Swap list was clean\n");
1542 spin_unlock(&glob->lru_lock);
1544 BUG_ON(!drm_mm_clean(&bdev->addr_space_mm));
1545 write_lock(&bdev->vm_lock);
1546 drm_mm_takedown(&bdev->addr_space_mm);
1547 write_unlock(&bdev->vm_lock);
1551 EXPORT_SYMBOL(ttm_bo_device_release);
1553 int ttm_bo_device_init(struct ttm_bo_device *bdev,
1554 struct ttm_bo_global *glob,
1555 struct ttm_bo_driver *driver,
1556 uint64_t file_page_offset,
1561 rwlock_init(&bdev->vm_lock);
1562 bdev->driver = driver;
1564 memset(bdev->man, 0, sizeof(bdev->man));
1567 * Initialize the system memory buffer type.
1568 * Other types need to be driver / IOCTL initialized.
1570 ret = ttm_bo_init_mm(bdev, TTM_PL_SYSTEM, 0);
1571 if (unlikely(ret != 0))
1574 bdev->addr_space_rb = RB_ROOT;
1575 ret = drm_mm_init(&bdev->addr_space_mm, file_page_offset, 0x10000000);
1576 if (unlikely(ret != 0))
1577 goto out_no_addr_mm;
1579 INIT_DELAYED_WORK(&bdev->wq, ttm_bo_delayed_workqueue);
1580 bdev->nice_mode = true;
1581 INIT_LIST_HEAD(&bdev->ddestroy);
1582 bdev->dev_mapping = NULL;
1584 bdev->need_dma32 = need_dma32;
1586 spin_lock_init(&bdev->fence_lock);
1587 mutex_lock(&glob->device_list_mutex);
1588 list_add_tail(&bdev->device_list, &glob->device_list);
1589 mutex_unlock(&glob->device_list_mutex);
1593 ttm_bo_clean_mm(bdev, 0);
1597 EXPORT_SYMBOL(ttm_bo_device_init);
1600 * buffer object vm functions.
1603 bool ttm_mem_reg_is_pci(struct ttm_bo_device *bdev, struct ttm_mem_reg *mem)
1605 struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
1607 if (!(man->flags & TTM_MEMTYPE_FLAG_FIXED)) {
1608 if (mem->mem_type == TTM_PL_SYSTEM)
1611 if (man->flags & TTM_MEMTYPE_FLAG_CMA)
1614 if (mem->placement & TTM_PL_FLAG_CACHED)
1620 void ttm_bo_unmap_virtual_locked(struct ttm_buffer_object *bo)
1622 struct ttm_bo_device *bdev = bo->bdev;
1623 loff_t offset = (loff_t) bo->addr_space_offset;
1624 loff_t holelen = ((loff_t) bo->mem.num_pages) << PAGE_SHIFT;
1626 if (!bdev->dev_mapping)
1628 unmap_mapping_range(bdev->dev_mapping, offset, holelen, 1);
1629 ttm_mem_io_free_vm(bo);
1632 void ttm_bo_unmap_virtual(struct ttm_buffer_object *bo)
1634 struct ttm_bo_device *bdev = bo->bdev;
1635 struct ttm_mem_type_manager *man = &bdev->man[bo->mem.mem_type];
1637 ttm_mem_io_lock(man, false);
1638 ttm_bo_unmap_virtual_locked(bo);
1639 ttm_mem_io_unlock(man);
1643 EXPORT_SYMBOL(ttm_bo_unmap_virtual);
1645 static void ttm_bo_vm_insert_rb(struct ttm_buffer_object *bo)
1647 struct ttm_bo_device *bdev = bo->bdev;
1648 struct rb_node **cur = &bdev->addr_space_rb.rb_node;
1649 struct rb_node *parent = NULL;
1650 struct ttm_buffer_object *cur_bo;
1651 unsigned long offset = bo->vm_node->start;
1652 unsigned long cur_offset;
1656 cur_bo = rb_entry(parent, struct ttm_buffer_object, vm_rb);
1657 cur_offset = cur_bo->vm_node->start;
1658 if (offset < cur_offset)
1659 cur = &parent->rb_left;
1660 else if (offset > cur_offset)
1661 cur = &parent->rb_right;
1666 rb_link_node(&bo->vm_rb, parent, cur);
1667 rb_insert_color(&bo->vm_rb, &bdev->addr_space_rb);
1673 * @bo: the buffer to allocate address space for
1675 * Allocate address space in the drm device so that applications
1676 * can mmap the buffer and access the contents. This only
1677 * applies to ttm_bo_type_device objects as others are not
1678 * placed in the drm device address space.
1681 static int ttm_bo_setup_vm(struct ttm_buffer_object *bo)
1683 struct ttm_bo_device *bdev = bo->bdev;
1687 ret = drm_mm_pre_get(&bdev->addr_space_mm);
1688 if (unlikely(ret != 0))
1691 write_lock(&bdev->vm_lock);
1692 bo->vm_node = drm_mm_search_free(&bdev->addr_space_mm,
1693 bo->mem.num_pages, 0, 0);
1695 if (unlikely(bo->vm_node == NULL)) {
1700 bo->vm_node = drm_mm_get_block_atomic(bo->vm_node,
1701 bo->mem.num_pages, 0);
1703 if (unlikely(bo->vm_node == NULL)) {
1704 write_unlock(&bdev->vm_lock);
1708 ttm_bo_vm_insert_rb(bo);
1709 write_unlock(&bdev->vm_lock);
1710 bo->addr_space_offset = ((uint64_t) bo->vm_node->start) << PAGE_SHIFT;
1714 write_unlock(&bdev->vm_lock);
1718 int ttm_bo_wait(struct ttm_buffer_object *bo,
1719 bool lazy, bool interruptible, bool no_wait)
1721 struct ttm_bo_driver *driver = bo->bdev->driver;
1722 struct ttm_bo_device *bdev = bo->bdev;
1727 if (likely(bo->sync_obj == NULL))
1730 while (bo->sync_obj) {
1732 if (driver->sync_obj_signaled(bo->sync_obj, bo->sync_obj_arg)) {
1733 void *tmp_obj = bo->sync_obj;
1734 bo->sync_obj = NULL;
1735 clear_bit(TTM_BO_PRIV_FLAG_MOVING, &bo->priv_flags);
1736 spin_unlock(&bdev->fence_lock);
1737 driver->sync_obj_unref(&tmp_obj);
1738 spin_lock(&bdev->fence_lock);
1745 sync_obj = driver->sync_obj_ref(bo->sync_obj);
1746 sync_obj_arg = bo->sync_obj_arg;
1747 spin_unlock(&bdev->fence_lock);
1748 ret = driver->sync_obj_wait(sync_obj, sync_obj_arg,
1749 lazy, interruptible);
1750 if (unlikely(ret != 0)) {
1751 driver->sync_obj_unref(&sync_obj);
1752 spin_lock(&bdev->fence_lock);
1755 spin_lock(&bdev->fence_lock);
1756 if (likely(bo->sync_obj == sync_obj &&
1757 bo->sync_obj_arg == sync_obj_arg)) {
1758 void *tmp_obj = bo->sync_obj;
1759 bo->sync_obj = NULL;
1760 clear_bit(TTM_BO_PRIV_FLAG_MOVING,
1762 spin_unlock(&bdev->fence_lock);
1763 driver->sync_obj_unref(&sync_obj);
1764 driver->sync_obj_unref(&tmp_obj);
1765 spin_lock(&bdev->fence_lock);
1767 spin_unlock(&bdev->fence_lock);
1768 driver->sync_obj_unref(&sync_obj);
1769 spin_lock(&bdev->fence_lock);
1774 EXPORT_SYMBOL(ttm_bo_wait);
1776 int ttm_bo_synccpu_write_grab(struct ttm_buffer_object *bo, bool no_wait)
1778 struct ttm_bo_device *bdev = bo->bdev;
1782 * Using ttm_bo_reserve makes sure the lru lists are updated.
1785 ret = ttm_bo_reserve(bo, true, no_wait, false, 0);
1786 if (unlikely(ret != 0))
1788 spin_lock(&bdev->fence_lock);
1789 ret = ttm_bo_wait(bo, false, true, no_wait);
1790 spin_unlock(&bdev->fence_lock);
1791 if (likely(ret == 0))
1792 atomic_inc(&bo->cpu_writers);
1793 ttm_bo_unreserve(bo);
1796 EXPORT_SYMBOL(ttm_bo_synccpu_write_grab);
1798 void ttm_bo_synccpu_write_release(struct ttm_buffer_object *bo)
1800 if (atomic_dec_and_test(&bo->cpu_writers))
1801 wake_up_all(&bo->event_queue);
1803 EXPORT_SYMBOL(ttm_bo_synccpu_write_release);
1806 * A buffer object shrink method that tries to swap out the first
1807 * buffer object on the bo_global::swap_lru list.
1810 static int ttm_bo_swapout(struct ttm_mem_shrink *shrink)
1812 struct ttm_bo_global *glob =
1813 container_of(shrink, struct ttm_bo_global, shrink);
1814 struct ttm_buffer_object *bo;
1817 uint32_t swap_placement = (TTM_PL_FLAG_CACHED | TTM_PL_FLAG_SYSTEM);
1819 spin_lock(&glob->lru_lock);
1820 while (ret == -EBUSY) {
1821 if (unlikely(list_empty(&glob->swap_lru))) {
1822 spin_unlock(&glob->lru_lock);
1826 bo = list_first_entry(&glob->swap_lru,
1827 struct ttm_buffer_object, swap);
1828 kref_get(&bo->list_kref);
1830 if (!list_empty(&bo->ddestroy)) {
1831 spin_unlock(&glob->lru_lock);
1832 (void) ttm_bo_cleanup_refs(bo, false, false, false);
1833 kref_put(&bo->list_kref, ttm_bo_release_list);
1834 spin_lock(&glob->lru_lock);
1839 * Reserve buffer. Since we unlock while sleeping, we need
1840 * to re-check that nobody removed us from the swap-list while
1844 ret = ttm_bo_reserve_locked(bo, false, true, false, 0);
1845 if (unlikely(ret == -EBUSY)) {
1846 spin_unlock(&glob->lru_lock);
1847 ttm_bo_wait_unreserved(bo, false);
1848 kref_put(&bo->list_kref, ttm_bo_release_list);
1849 spin_lock(&glob->lru_lock);
1854 put_count = ttm_bo_del_from_lru(bo);
1855 spin_unlock(&glob->lru_lock);
1857 ttm_bo_list_ref_sub(bo, put_count, true);
1860 * Wait for GPU, then move to system cached.
1863 spin_lock(&bo->bdev->fence_lock);
1864 ret = ttm_bo_wait(bo, false, false, false);
1865 spin_unlock(&bo->bdev->fence_lock);
1867 if (unlikely(ret != 0))
1870 if ((bo->mem.placement & swap_placement) != swap_placement) {
1871 struct ttm_mem_reg evict_mem;
1873 evict_mem = bo->mem;
1874 evict_mem.mm_node = NULL;
1875 evict_mem.placement = TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED;
1876 evict_mem.mem_type = TTM_PL_SYSTEM;
1878 ret = ttm_bo_handle_move_mem(bo, &evict_mem, true,
1879 false, false, false);
1880 if (unlikely(ret != 0))
1884 ttm_bo_unmap_virtual(bo);
1887 * Swap out. Buffer will be swapped in again as soon as
1888 * anyone tries to access a ttm page.
1891 if (bo->bdev->driver->swap_notify)
1892 bo->bdev->driver->swap_notify(bo);
1894 ret = ttm_tt_swapout(bo->ttm, bo->persistent_swap_storage);
1899 * Unreserve without putting on LRU to avoid swapping out an
1900 * already swapped buffer.
1903 atomic_set(&bo->reserved, 0);
1904 wake_up_all(&bo->event_queue);
1905 kref_put(&bo->list_kref, ttm_bo_release_list);
1909 void ttm_bo_swapout_all(struct ttm_bo_device *bdev)
1911 while (ttm_bo_swapout(&bdev->glob->shrink) == 0)
1914 EXPORT_SYMBOL(ttm_bo_swapout_all);