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 #include "ttm/ttm_module.h"
32 #include "ttm/ttm_bo_driver.h"
33 #include "ttm/ttm_placement.h"
34 #include <linux/jiffies.h>
35 #include <linux/slab.h>
36 #include <linux/sched.h>
38 #include <linux/file.h>
39 #include <linux/module.h>
40 #include <linux/atomic.h>
42 #define TTM_ASSERT_LOCKED(param)
43 #define TTM_DEBUG(fmt, arg...)
44 #define TTM_BO_HASH_ORDER 13
46 static int ttm_bo_setup_vm(struct ttm_buffer_object *bo);
47 static int ttm_bo_swapout(struct ttm_mem_shrink *shrink);
48 static void ttm_bo_global_kobj_release(struct kobject *kobj);
50 static struct attribute ttm_bo_count = {
55 static inline int ttm_mem_type_from_flags(uint32_t flags, uint32_t *mem_type)
59 for (i = 0; i <= TTM_PL_PRIV5; i++)
60 if (flags & (1 << i)) {
67 static void ttm_mem_type_debug(struct ttm_bo_device *bdev, int mem_type)
69 struct ttm_mem_type_manager *man = &bdev->man[mem_type];
71 printk(KERN_ERR TTM_PFX " has_type: %d\n", man->has_type);
72 printk(KERN_ERR TTM_PFX " use_type: %d\n", man->use_type);
73 printk(KERN_ERR TTM_PFX " flags: 0x%08X\n", man->flags);
74 printk(KERN_ERR TTM_PFX " gpu_offset: 0x%08lX\n", man->gpu_offset);
75 printk(KERN_ERR TTM_PFX " size: %llu\n", man->size);
76 printk(KERN_ERR TTM_PFX " available_caching: 0x%08X\n",
77 man->available_caching);
78 printk(KERN_ERR TTM_PFX " default_caching: 0x%08X\n",
79 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 printk(KERN_ERR TTM_PFX "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 printk(KERN_ERR TTM_PFX " 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;
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);
155 ttm_mem_global_free(bdev->glob->mem_glob, bo->acc_size);
160 int ttm_bo_wait_unreserved(struct ttm_buffer_object *bo, bool interruptible)
163 return wait_event_interruptible(bo->event_queue,
164 atomic_read(&bo->reserved) == 0);
166 wait_event(bo->event_queue, atomic_read(&bo->reserved) == 0);
170 EXPORT_SYMBOL(ttm_bo_wait_unreserved);
172 void ttm_bo_add_to_lru(struct ttm_buffer_object *bo)
174 struct ttm_bo_device *bdev = bo->bdev;
175 struct ttm_mem_type_manager *man;
177 BUG_ON(!atomic_read(&bo->reserved));
179 if (!(bo->mem.placement & TTM_PL_FLAG_NO_EVICT)) {
181 BUG_ON(!list_empty(&bo->lru));
183 man = &bdev->man[bo->mem.mem_type];
184 list_add_tail(&bo->lru, &man->lru);
185 kref_get(&bo->list_kref);
187 if (bo->ttm != NULL) {
188 list_add_tail(&bo->swap, &bo->glob->swap_lru);
189 kref_get(&bo->list_kref);
194 int ttm_bo_del_from_lru(struct ttm_buffer_object *bo)
198 if (!list_empty(&bo->swap)) {
199 list_del_init(&bo->swap);
202 if (!list_empty(&bo->lru)) {
203 list_del_init(&bo->lru);
208 * TODO: Add a driver hook to delete from
209 * driver-specific LRU's here.
215 int ttm_bo_reserve_locked(struct ttm_buffer_object *bo,
217 bool no_wait, bool use_sequence, uint32_t sequence)
219 struct ttm_bo_global *glob = bo->glob;
222 while (unlikely(atomic_cmpxchg(&bo->reserved, 0, 1) != 0)) {
224 * Deadlock avoidance for multi-bo reserving.
226 if (use_sequence && bo->seq_valid) {
228 * We've already reserved this one.
230 if (unlikely(sequence == bo->val_seq))
233 * Already reserved by a thread that will not back
234 * off for us. We need to back off.
236 if (unlikely(sequence - bo->val_seq < (1 << 31)))
243 spin_unlock(&glob->lru_lock);
244 ret = ttm_bo_wait_unreserved(bo, interruptible);
245 spin_lock(&glob->lru_lock);
253 * Wake up waiters that may need to recheck for deadlock,
254 * if we decreased the sequence number.
256 if (unlikely((bo->val_seq - sequence < (1 << 31))
258 wake_up_all(&bo->event_queue);
260 bo->val_seq = sequence;
261 bo->seq_valid = true;
263 bo->seq_valid = false;
268 EXPORT_SYMBOL(ttm_bo_reserve);
270 static void ttm_bo_ref_bug(struct kref *list_kref)
275 void ttm_bo_list_ref_sub(struct ttm_buffer_object *bo, int count,
278 kref_sub(&bo->list_kref, count,
279 (never_free) ? ttm_bo_ref_bug : ttm_bo_release_list);
282 int ttm_bo_reserve(struct ttm_buffer_object *bo,
284 bool no_wait, bool use_sequence, uint32_t sequence)
286 struct ttm_bo_global *glob = bo->glob;
290 spin_lock(&glob->lru_lock);
291 ret = ttm_bo_reserve_locked(bo, interruptible, no_wait, use_sequence,
293 if (likely(ret == 0))
294 put_count = ttm_bo_del_from_lru(bo);
295 spin_unlock(&glob->lru_lock);
297 ttm_bo_list_ref_sub(bo, put_count, true);
302 void ttm_bo_unreserve_locked(struct ttm_buffer_object *bo)
304 ttm_bo_add_to_lru(bo);
305 atomic_set(&bo->reserved, 0);
306 wake_up_all(&bo->event_queue);
309 void ttm_bo_unreserve(struct ttm_buffer_object *bo)
311 struct ttm_bo_global *glob = bo->glob;
313 spin_lock(&glob->lru_lock);
314 ttm_bo_unreserve_locked(bo);
315 spin_unlock(&glob->lru_lock);
317 EXPORT_SYMBOL(ttm_bo_unreserve);
320 * Call bo->mutex locked.
322 static int ttm_bo_add_ttm(struct ttm_buffer_object *bo, bool zero_alloc)
324 struct ttm_bo_device *bdev = bo->bdev;
325 struct ttm_bo_global *glob = bo->glob;
327 uint32_t page_flags = 0;
329 TTM_ASSERT_LOCKED(&bo->mutex);
332 if (bdev->need_dma32)
333 page_flags |= TTM_PAGE_FLAG_DMA32;
336 case ttm_bo_type_device:
338 page_flags |= TTM_PAGE_FLAG_ZERO_ALLOC;
339 case ttm_bo_type_kernel:
340 bo->ttm = ttm_tt_create(bdev, bo->num_pages << PAGE_SHIFT,
341 page_flags, glob->dummy_read_page);
342 if (unlikely(bo->ttm == NULL))
345 case ttm_bo_type_user:
346 bo->ttm = ttm_tt_create(bdev, bo->num_pages << PAGE_SHIFT,
347 page_flags | TTM_PAGE_FLAG_USER,
348 glob->dummy_read_page);
349 if (unlikely(bo->ttm == NULL)) {
354 ret = ttm_tt_set_user(bo->ttm, current,
355 bo->buffer_start, bo->num_pages);
356 if (unlikely(ret != 0)) {
357 ttm_tt_destroy(bo->ttm);
362 printk(KERN_ERR TTM_PFX "Illegal buffer object type\n");
370 static int ttm_bo_handle_move_mem(struct ttm_buffer_object *bo,
371 struct ttm_mem_reg *mem,
372 bool evict, bool interruptible,
373 bool no_wait_reserve, bool no_wait_gpu)
375 struct ttm_bo_device *bdev = bo->bdev;
376 bool old_is_pci = ttm_mem_reg_is_pci(bdev, &bo->mem);
377 bool new_is_pci = ttm_mem_reg_is_pci(bdev, mem);
378 struct ttm_mem_type_manager *old_man = &bdev->man[bo->mem.mem_type];
379 struct ttm_mem_type_manager *new_man = &bdev->man[mem->mem_type];
382 if (old_is_pci || new_is_pci ||
383 ((mem->placement & bo->mem.placement & TTM_PL_MASK_CACHING) == 0)) {
384 ret = ttm_mem_io_lock(old_man, true);
385 if (unlikely(ret != 0))
387 ttm_bo_unmap_virtual_locked(bo);
388 ttm_mem_io_unlock(old_man);
392 * Create and bind a ttm if required.
395 if (!(new_man->flags & TTM_MEMTYPE_FLAG_FIXED)) {
396 if (bo->ttm == NULL) {
397 ret = ttm_bo_add_ttm(bo, false);
402 ret = ttm_tt_set_placement_caching(bo->ttm, mem->placement);
406 if (mem->mem_type != TTM_PL_SYSTEM) {
407 ret = ttm_tt_bind(bo->ttm, mem);
412 if (bo->mem.mem_type == TTM_PL_SYSTEM) {
413 if (bdev->driver->move_notify)
414 bdev->driver->move_notify(bo, mem);
421 if (bdev->driver->move_notify)
422 bdev->driver->move_notify(bo, mem);
424 if (!(old_man->flags & TTM_MEMTYPE_FLAG_FIXED) &&
425 !(new_man->flags & TTM_MEMTYPE_FLAG_FIXED))
426 ret = ttm_bo_move_ttm(bo, evict, no_wait_reserve, no_wait_gpu, mem);
427 else if (bdev->driver->move)
428 ret = bdev->driver->move(bo, evict, interruptible,
429 no_wait_reserve, no_wait_gpu, mem);
431 ret = ttm_bo_move_memcpy(bo, evict, no_wait_reserve, no_wait_gpu, mem);
438 ret = bdev->driver->invalidate_caches(bdev, bo->mem.placement);
440 printk(KERN_ERR TTM_PFX "Can not flush read caches\n");
444 if (bo->mem.mm_node) {
445 bo->offset = (bo->mem.start << PAGE_SHIFT) +
446 bdev->man[bo->mem.mem_type].gpu_offset;
447 bo->cur_placement = bo->mem.placement;
454 new_man = &bdev->man[bo->mem.mem_type];
455 if ((new_man->flags & TTM_MEMTYPE_FLAG_FIXED) && bo->ttm) {
456 ttm_tt_unbind(bo->ttm);
457 ttm_tt_destroy(bo->ttm);
466 * Will release GPU memory type usage on destruction.
467 * This is the place to put in driver specific hooks to release
468 * driver private resources.
469 * Will release the bo::reserved lock.
472 static void ttm_bo_cleanup_memtype_use(struct ttm_buffer_object *bo)
475 ttm_tt_unbind(bo->ttm);
476 ttm_tt_destroy(bo->ttm);
479 ttm_bo_mem_put(bo, &bo->mem);
481 atomic_set(&bo->reserved, 0);
484 * Make processes trying to reserve really pick it up.
486 smp_mb__after_atomic_dec();
487 wake_up_all(&bo->event_queue);
490 static void ttm_bo_cleanup_refs_or_queue(struct ttm_buffer_object *bo)
492 struct ttm_bo_device *bdev = bo->bdev;
493 struct ttm_bo_global *glob = bo->glob;
494 struct ttm_bo_driver *driver;
495 void *sync_obj = NULL;
500 spin_lock(&bdev->fence_lock);
501 (void) ttm_bo_wait(bo, false, false, true);
504 spin_lock(&glob->lru_lock);
507 * Lock inversion between bo:reserve and bdev::fence_lock here,
508 * but that's OK, since we're only trylocking.
511 ret = ttm_bo_reserve_locked(bo, false, true, false, 0);
513 if (unlikely(ret == -EBUSY))
516 spin_unlock(&bdev->fence_lock);
517 put_count = ttm_bo_del_from_lru(bo);
519 spin_unlock(&glob->lru_lock);
520 ttm_bo_cleanup_memtype_use(bo);
522 ttm_bo_list_ref_sub(bo, put_count, true);
526 spin_lock(&glob->lru_lock);
529 driver = bdev->driver;
531 sync_obj = driver->sync_obj_ref(bo->sync_obj);
532 sync_obj_arg = bo->sync_obj_arg;
534 kref_get(&bo->list_kref);
535 list_add_tail(&bo->ddestroy, &bdev->ddestroy);
536 spin_unlock(&glob->lru_lock);
537 spin_unlock(&bdev->fence_lock);
540 driver->sync_obj_flush(sync_obj, sync_obj_arg);
541 driver->sync_obj_unref(&sync_obj);
543 schedule_delayed_work(&bdev->wq,
544 ((HZ / 100) < 1) ? 1 : HZ / 100);
548 * function ttm_bo_cleanup_refs
549 * If bo idle, remove from delayed- and lru lists, and unref.
550 * If not idle, do nothing.
552 * @interruptible Any sleeps should occur interruptibly.
553 * @no_wait_reserve Never wait for reserve. Return -EBUSY instead.
554 * @no_wait_gpu Never wait for gpu. Return -EBUSY instead.
557 static int ttm_bo_cleanup_refs(struct ttm_buffer_object *bo,
559 bool no_wait_reserve,
562 struct ttm_bo_device *bdev = bo->bdev;
563 struct ttm_bo_global *glob = bo->glob;
568 spin_lock(&bdev->fence_lock);
569 ret = ttm_bo_wait(bo, false, interruptible, no_wait_gpu);
570 spin_unlock(&bdev->fence_lock);
572 if (unlikely(ret != 0))
575 spin_lock(&glob->lru_lock);
576 ret = ttm_bo_reserve_locked(bo, interruptible,
577 no_wait_reserve, false, 0);
579 if (unlikely(ret != 0) || list_empty(&bo->ddestroy)) {
580 spin_unlock(&glob->lru_lock);
585 * We can re-check for sync object without taking
586 * the bo::lock since setting the sync object requires
587 * also bo::reserved. A busy object at this point may
588 * be caused by another thread recently starting an accelerated
592 if (unlikely(bo->sync_obj)) {
593 atomic_set(&bo->reserved, 0);
594 wake_up_all(&bo->event_queue);
595 spin_unlock(&glob->lru_lock);
599 put_count = ttm_bo_del_from_lru(bo);
600 list_del_init(&bo->ddestroy);
603 spin_unlock(&glob->lru_lock);
604 ttm_bo_cleanup_memtype_use(bo);
606 ttm_bo_list_ref_sub(bo, put_count, true);
612 * Traverse the delayed list, and call ttm_bo_cleanup_refs on all
613 * encountered buffers.
616 static int ttm_bo_delayed_delete(struct ttm_bo_device *bdev, bool remove_all)
618 struct ttm_bo_global *glob = bdev->glob;
619 struct ttm_buffer_object *entry = NULL;
622 spin_lock(&glob->lru_lock);
623 if (list_empty(&bdev->ddestroy))
626 entry = list_first_entry(&bdev->ddestroy,
627 struct ttm_buffer_object, ddestroy);
628 kref_get(&entry->list_kref);
631 struct ttm_buffer_object *nentry = NULL;
633 if (entry->ddestroy.next != &bdev->ddestroy) {
634 nentry = list_first_entry(&entry->ddestroy,
635 struct ttm_buffer_object, ddestroy);
636 kref_get(&nentry->list_kref);
639 spin_unlock(&glob->lru_lock);
640 ret = ttm_bo_cleanup_refs(entry, false, !remove_all,
642 kref_put(&entry->list_kref, ttm_bo_release_list);
648 spin_lock(&glob->lru_lock);
649 if (list_empty(&entry->ddestroy))
654 spin_unlock(&glob->lru_lock);
657 kref_put(&entry->list_kref, ttm_bo_release_list);
661 static void ttm_bo_delayed_workqueue(struct work_struct *work)
663 struct ttm_bo_device *bdev =
664 container_of(work, struct ttm_bo_device, wq.work);
666 if (ttm_bo_delayed_delete(bdev, false)) {
667 schedule_delayed_work(&bdev->wq,
668 ((HZ / 100) < 1) ? 1 : HZ / 100);
672 static void ttm_bo_release(struct kref *kref)
674 struct ttm_buffer_object *bo =
675 container_of(kref, struct ttm_buffer_object, kref);
676 struct ttm_bo_device *bdev = bo->bdev;
677 struct ttm_mem_type_manager *man = &bdev->man[bo->mem.mem_type];
679 if (likely(bo->vm_node != NULL)) {
680 rb_erase(&bo->vm_rb, &bdev->addr_space_rb);
681 drm_mm_put_block(bo->vm_node);
684 write_unlock(&bdev->vm_lock);
685 ttm_mem_io_lock(man, false);
686 ttm_mem_io_free_vm(bo);
687 ttm_mem_io_unlock(man);
688 ttm_bo_cleanup_refs_or_queue(bo);
689 kref_put(&bo->list_kref, ttm_bo_release_list);
690 write_lock(&bdev->vm_lock);
693 void ttm_bo_unref(struct ttm_buffer_object **p_bo)
695 struct ttm_buffer_object *bo = *p_bo;
696 struct ttm_bo_device *bdev = bo->bdev;
699 write_lock(&bdev->vm_lock);
700 kref_put(&bo->kref, ttm_bo_release);
701 write_unlock(&bdev->vm_lock);
703 EXPORT_SYMBOL(ttm_bo_unref);
705 int ttm_bo_lock_delayed_workqueue(struct ttm_bo_device *bdev)
707 return cancel_delayed_work_sync(&bdev->wq);
709 EXPORT_SYMBOL(ttm_bo_lock_delayed_workqueue);
711 void ttm_bo_unlock_delayed_workqueue(struct ttm_bo_device *bdev, int resched)
714 schedule_delayed_work(&bdev->wq,
715 ((HZ / 100) < 1) ? 1 : HZ / 100);
717 EXPORT_SYMBOL(ttm_bo_unlock_delayed_workqueue);
719 static int ttm_bo_evict(struct ttm_buffer_object *bo, bool interruptible,
720 bool no_wait_reserve, bool no_wait_gpu)
722 struct ttm_bo_device *bdev = bo->bdev;
723 struct ttm_mem_reg evict_mem;
724 struct ttm_placement placement;
727 spin_lock(&bdev->fence_lock);
728 ret = ttm_bo_wait(bo, false, interruptible, no_wait_gpu);
729 spin_unlock(&bdev->fence_lock);
731 if (unlikely(ret != 0)) {
732 if (ret != -ERESTARTSYS) {
733 printk(KERN_ERR TTM_PFX
734 "Failed to expire sync object before "
735 "buffer eviction.\n");
740 BUG_ON(!atomic_read(&bo->reserved));
743 evict_mem.mm_node = NULL;
744 evict_mem.bus.io_reserved_vm = false;
745 evict_mem.bus.io_reserved_count = 0;
749 placement.num_placement = 0;
750 placement.num_busy_placement = 0;
751 bdev->driver->evict_flags(bo, &placement);
752 ret = ttm_bo_mem_space(bo, &placement, &evict_mem, interruptible,
753 no_wait_reserve, no_wait_gpu);
755 if (ret != -ERESTARTSYS) {
756 printk(KERN_ERR TTM_PFX
757 "Failed to find memory space for "
758 "buffer 0x%p eviction.\n", bo);
759 ttm_bo_mem_space_debug(bo, &placement);
764 ret = ttm_bo_handle_move_mem(bo, &evict_mem, true, interruptible,
765 no_wait_reserve, no_wait_gpu);
767 if (ret != -ERESTARTSYS)
768 printk(KERN_ERR TTM_PFX "Buffer eviction failed\n");
769 ttm_bo_mem_put(bo, &evict_mem);
777 static int ttm_mem_evict_first(struct ttm_bo_device *bdev,
779 bool interruptible, bool no_wait_reserve,
782 struct ttm_bo_global *glob = bdev->glob;
783 struct ttm_mem_type_manager *man = &bdev->man[mem_type];
784 struct ttm_buffer_object *bo;
785 int ret, put_count = 0;
788 spin_lock(&glob->lru_lock);
789 if (list_empty(&man->lru)) {
790 spin_unlock(&glob->lru_lock);
794 bo = list_first_entry(&man->lru, struct ttm_buffer_object, lru);
795 kref_get(&bo->list_kref);
797 if (!list_empty(&bo->ddestroy)) {
798 spin_unlock(&glob->lru_lock);
799 ret = ttm_bo_cleanup_refs(bo, interruptible,
800 no_wait_reserve, no_wait_gpu);
801 kref_put(&bo->list_kref, ttm_bo_release_list);
803 if (likely(ret == 0 || ret == -ERESTARTSYS))
809 ret = ttm_bo_reserve_locked(bo, false, no_wait_reserve, false, 0);
811 if (unlikely(ret == -EBUSY)) {
812 spin_unlock(&glob->lru_lock);
813 if (likely(!no_wait_gpu))
814 ret = ttm_bo_wait_unreserved(bo, interruptible);
816 kref_put(&bo->list_kref, ttm_bo_release_list);
819 * We *need* to retry after releasing the lru lock.
822 if (unlikely(ret != 0))
827 put_count = ttm_bo_del_from_lru(bo);
828 spin_unlock(&glob->lru_lock);
832 ttm_bo_list_ref_sub(bo, put_count, true);
834 ret = ttm_bo_evict(bo, interruptible, no_wait_reserve, no_wait_gpu);
835 ttm_bo_unreserve(bo);
837 kref_put(&bo->list_kref, ttm_bo_release_list);
841 void ttm_bo_mem_put(struct ttm_buffer_object *bo, struct ttm_mem_reg *mem)
843 struct ttm_mem_type_manager *man = &bo->bdev->man[mem->mem_type];
846 (*man->func->put_node)(man, mem);
848 EXPORT_SYMBOL(ttm_bo_mem_put);
851 * Repeatedly evict memory from the LRU for @mem_type until we create enough
852 * space, or we've evicted everything and there isn't enough space.
854 static int ttm_bo_mem_force_space(struct ttm_buffer_object *bo,
856 struct ttm_placement *placement,
857 struct ttm_mem_reg *mem,
859 bool no_wait_reserve,
862 struct ttm_bo_device *bdev = bo->bdev;
863 struct ttm_mem_type_manager *man = &bdev->man[mem_type];
867 ret = (*man->func->get_node)(man, bo, placement, mem);
868 if (unlikely(ret != 0))
872 ret = ttm_mem_evict_first(bdev, mem_type, interruptible,
873 no_wait_reserve, no_wait_gpu);
874 if (unlikely(ret != 0))
877 if (mem->mm_node == NULL)
879 mem->mem_type = mem_type;
883 static uint32_t ttm_bo_select_caching(struct ttm_mem_type_manager *man,
884 uint32_t cur_placement,
885 uint32_t proposed_placement)
887 uint32_t caching = proposed_placement & TTM_PL_MASK_CACHING;
888 uint32_t result = proposed_placement & ~TTM_PL_MASK_CACHING;
891 * Keep current caching if possible.
894 if ((cur_placement & caching) != 0)
895 result |= (cur_placement & caching);
896 else if ((man->default_caching & caching) != 0)
897 result |= man->default_caching;
898 else if ((TTM_PL_FLAG_CACHED & caching) != 0)
899 result |= TTM_PL_FLAG_CACHED;
900 else if ((TTM_PL_FLAG_WC & caching) != 0)
901 result |= TTM_PL_FLAG_WC;
902 else if ((TTM_PL_FLAG_UNCACHED & caching) != 0)
903 result |= TTM_PL_FLAG_UNCACHED;
908 static bool ttm_bo_mt_compatible(struct ttm_mem_type_manager *man,
911 uint32_t proposed_placement,
912 uint32_t *masked_placement)
914 uint32_t cur_flags = ttm_bo_type_flags(mem_type);
916 if ((man->flags & TTM_MEMTYPE_FLAG_FIXED) && disallow_fixed)
919 if ((cur_flags & proposed_placement & TTM_PL_MASK_MEM) == 0)
922 if ((proposed_placement & man->available_caching) == 0)
925 cur_flags |= (proposed_placement & man->available_caching);
927 *masked_placement = cur_flags;
932 * Creates space for memory region @mem according to its type.
934 * This function first searches for free space in compatible memory types in
935 * the priority order defined by the driver. If free space isn't found, then
936 * ttm_bo_mem_force_space is attempted in priority order to evict and find
939 int ttm_bo_mem_space(struct ttm_buffer_object *bo,
940 struct ttm_placement *placement,
941 struct ttm_mem_reg *mem,
942 bool interruptible, bool no_wait_reserve,
945 struct ttm_bo_device *bdev = bo->bdev;
946 struct ttm_mem_type_manager *man;
947 uint32_t mem_type = TTM_PL_SYSTEM;
948 uint32_t cur_flags = 0;
949 bool type_found = false;
950 bool type_ok = false;
951 bool has_erestartsys = false;
955 for (i = 0; i < placement->num_placement; ++i) {
956 ret = ttm_mem_type_from_flags(placement->placement[i],
960 man = &bdev->man[mem_type];
962 type_ok = ttm_bo_mt_compatible(man,
963 bo->type == ttm_bo_type_user,
965 placement->placement[i],
971 cur_flags = ttm_bo_select_caching(man, bo->mem.placement,
974 * Use the access and other non-mapping-related flag bits from
975 * the memory placement flags to the current flags
977 ttm_flag_masked(&cur_flags, placement->placement[i],
978 ~TTM_PL_MASK_MEMTYPE);
980 if (mem_type == TTM_PL_SYSTEM)
983 if (man->has_type && man->use_type) {
985 ret = (*man->func->get_node)(man, bo, placement, mem);
993 if ((type_ok && (mem_type == TTM_PL_SYSTEM)) || mem->mm_node) {
994 mem->mem_type = mem_type;
995 mem->placement = cur_flags;
1002 for (i = 0; i < placement->num_busy_placement; ++i) {
1003 ret = ttm_mem_type_from_flags(placement->busy_placement[i],
1007 man = &bdev->man[mem_type];
1010 if (!ttm_bo_mt_compatible(man,
1011 bo->type == ttm_bo_type_user,
1013 placement->busy_placement[i],
1017 cur_flags = ttm_bo_select_caching(man, bo->mem.placement,
1020 * Use the access and other non-mapping-related flag bits from
1021 * the memory placement flags to the current flags
1023 ttm_flag_masked(&cur_flags, placement->busy_placement[i],
1024 ~TTM_PL_MASK_MEMTYPE);
1027 if (mem_type == TTM_PL_SYSTEM) {
1028 mem->mem_type = mem_type;
1029 mem->placement = cur_flags;
1030 mem->mm_node = NULL;
1034 ret = ttm_bo_mem_force_space(bo, mem_type, placement, mem,
1035 interruptible, no_wait_reserve, no_wait_gpu);
1036 if (ret == 0 && mem->mm_node) {
1037 mem->placement = cur_flags;
1040 if (ret == -ERESTARTSYS)
1041 has_erestartsys = true;
1043 ret = (has_erestartsys) ? -ERESTARTSYS : -ENOMEM;
1046 EXPORT_SYMBOL(ttm_bo_mem_space);
1048 int ttm_bo_wait_cpu(struct ttm_buffer_object *bo, bool no_wait)
1050 if ((atomic_read(&bo->cpu_writers) > 0) && no_wait)
1053 return wait_event_interruptible(bo->event_queue,
1054 atomic_read(&bo->cpu_writers) == 0);
1056 EXPORT_SYMBOL(ttm_bo_wait_cpu);
1058 int ttm_bo_move_buffer(struct ttm_buffer_object *bo,
1059 struct ttm_placement *placement,
1060 bool interruptible, bool no_wait_reserve,
1064 struct ttm_mem_reg mem;
1065 struct ttm_bo_device *bdev = bo->bdev;
1067 BUG_ON(!atomic_read(&bo->reserved));
1070 * FIXME: It's possible to pipeline buffer moves.
1071 * Have the driver move function wait for idle when necessary,
1072 * instead of doing it here.
1074 spin_lock(&bdev->fence_lock);
1075 ret = ttm_bo_wait(bo, false, interruptible, no_wait_gpu);
1076 spin_unlock(&bdev->fence_lock);
1079 mem.num_pages = bo->num_pages;
1080 mem.size = mem.num_pages << PAGE_SHIFT;
1081 mem.page_alignment = bo->mem.page_alignment;
1082 mem.bus.io_reserved_vm = false;
1083 mem.bus.io_reserved_count = 0;
1085 * Determine where to move the buffer.
1087 ret = ttm_bo_mem_space(bo, placement, &mem, interruptible, no_wait_reserve, no_wait_gpu);
1090 ret = ttm_bo_handle_move_mem(bo, &mem, false, interruptible, no_wait_reserve, no_wait_gpu);
1092 if (ret && mem.mm_node)
1093 ttm_bo_mem_put(bo, &mem);
1097 static int ttm_bo_mem_compat(struct ttm_placement *placement,
1098 struct ttm_mem_reg *mem)
1102 if (mem->mm_node && placement->lpfn != 0 &&
1103 (mem->start < placement->fpfn ||
1104 mem->start + mem->num_pages > placement->lpfn))
1107 for (i = 0; i < placement->num_placement; i++) {
1108 if ((placement->placement[i] & mem->placement &
1109 TTM_PL_MASK_CACHING) &&
1110 (placement->placement[i] & mem->placement &
1117 int ttm_bo_validate(struct ttm_buffer_object *bo,
1118 struct ttm_placement *placement,
1119 bool interruptible, bool no_wait_reserve,
1124 BUG_ON(!atomic_read(&bo->reserved));
1125 /* Check that range is valid */
1126 if (placement->lpfn || placement->fpfn)
1127 if (placement->fpfn > placement->lpfn ||
1128 (placement->lpfn - placement->fpfn) < bo->num_pages)
1131 * Check whether we need to move buffer.
1133 ret = ttm_bo_mem_compat(placement, &bo->mem);
1135 ret = ttm_bo_move_buffer(bo, placement, interruptible, no_wait_reserve, no_wait_gpu);
1140 * Use the access and other non-mapping-related flag bits from
1141 * the compatible memory placement flags to the active flags
1143 ttm_flag_masked(&bo->mem.placement, placement->placement[ret],
1144 ~TTM_PL_MASK_MEMTYPE);
1147 * We might need to add a TTM.
1149 if (bo->mem.mem_type == TTM_PL_SYSTEM && bo->ttm == NULL) {
1150 ret = ttm_bo_add_ttm(bo, true);
1156 EXPORT_SYMBOL(ttm_bo_validate);
1158 int ttm_bo_check_placement(struct ttm_buffer_object *bo,
1159 struct ttm_placement *placement)
1161 BUG_ON((placement->fpfn || placement->lpfn) &&
1162 (bo->mem.num_pages > (placement->lpfn - placement->fpfn)));
1167 int ttm_bo_init(struct ttm_bo_device *bdev,
1168 struct ttm_buffer_object *bo,
1170 enum ttm_bo_type type,
1171 struct ttm_placement *placement,
1172 uint32_t page_alignment,
1173 unsigned long buffer_start,
1175 struct file *persistent_swap_storage,
1177 void (*destroy) (struct ttm_buffer_object *))
1180 unsigned long num_pages;
1182 size += buffer_start & ~PAGE_MASK;
1183 num_pages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
1184 if (num_pages == 0) {
1185 printk(KERN_ERR TTM_PFX "Illegal buffer object size.\n");
1192 bo->destroy = destroy;
1194 kref_init(&bo->kref);
1195 kref_init(&bo->list_kref);
1196 atomic_set(&bo->cpu_writers, 0);
1197 atomic_set(&bo->reserved, 1);
1198 init_waitqueue_head(&bo->event_queue);
1199 INIT_LIST_HEAD(&bo->lru);
1200 INIT_LIST_HEAD(&bo->ddestroy);
1201 INIT_LIST_HEAD(&bo->swap);
1202 INIT_LIST_HEAD(&bo->io_reserve_lru);
1204 bo->glob = bdev->glob;
1206 bo->num_pages = num_pages;
1207 bo->mem.size = num_pages << PAGE_SHIFT;
1208 bo->mem.mem_type = TTM_PL_SYSTEM;
1209 bo->mem.num_pages = bo->num_pages;
1210 bo->mem.mm_node = NULL;
1211 bo->mem.page_alignment = page_alignment;
1212 bo->mem.bus.io_reserved_vm = false;
1213 bo->mem.bus.io_reserved_count = 0;
1214 bo->buffer_start = buffer_start & PAGE_MASK;
1216 bo->mem.placement = (TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED);
1217 bo->seq_valid = false;
1218 bo->persistent_swap_storage = persistent_swap_storage;
1219 bo->acc_size = acc_size;
1220 atomic_inc(&bo->glob->bo_count);
1222 ret = ttm_bo_check_placement(bo, placement);
1223 if (unlikely(ret != 0))
1227 * For ttm_bo_type_device buffers, allocate
1228 * address space from the device.
1230 if (bo->type == ttm_bo_type_device) {
1231 ret = ttm_bo_setup_vm(bo);
1236 ret = ttm_bo_validate(bo, placement, interruptible, false, false);
1240 ttm_bo_unreserve(bo);
1244 ttm_bo_unreserve(bo);
1249 EXPORT_SYMBOL(ttm_bo_init);
1251 static inline size_t ttm_bo_size(struct ttm_bo_global *glob,
1252 unsigned long num_pages)
1254 size_t page_array_size = (num_pages * sizeof(void *) + PAGE_SIZE - 1) &
1257 return glob->ttm_bo_size + 2 * page_array_size;
1260 int ttm_bo_create(struct ttm_bo_device *bdev,
1262 enum ttm_bo_type type,
1263 struct ttm_placement *placement,
1264 uint32_t page_alignment,
1265 unsigned long buffer_start,
1267 struct file *persistent_swap_storage,
1268 struct ttm_buffer_object **p_bo)
1270 struct ttm_buffer_object *bo;
1271 struct ttm_mem_global *mem_glob = bdev->glob->mem_glob;
1275 ttm_bo_size(bdev->glob, (size + PAGE_SIZE - 1) >> PAGE_SHIFT);
1276 ret = ttm_mem_global_alloc(mem_glob, acc_size, false, false);
1277 if (unlikely(ret != 0))
1280 bo = kzalloc(sizeof(*bo), GFP_KERNEL);
1282 if (unlikely(bo == NULL)) {
1283 ttm_mem_global_free(mem_glob, acc_size);
1287 ret = ttm_bo_init(bdev, bo, size, type, placement, page_alignment,
1288 buffer_start, interruptible,
1289 persistent_swap_storage, acc_size, NULL);
1290 if (likely(ret == 0))
1296 static int ttm_bo_force_list_clean(struct ttm_bo_device *bdev,
1297 unsigned mem_type, bool allow_errors)
1299 struct ttm_mem_type_manager *man = &bdev->man[mem_type];
1300 struct ttm_bo_global *glob = bdev->glob;
1304 * Can't use standard list traversal since we're unlocking.
1307 spin_lock(&glob->lru_lock);
1308 while (!list_empty(&man->lru)) {
1309 spin_unlock(&glob->lru_lock);
1310 ret = ttm_mem_evict_first(bdev, mem_type, false, false, false);
1315 printk(KERN_ERR TTM_PFX
1316 "Cleanup eviction failed\n");
1319 spin_lock(&glob->lru_lock);
1321 spin_unlock(&glob->lru_lock);
1325 int ttm_bo_clean_mm(struct ttm_bo_device *bdev, unsigned mem_type)
1327 struct ttm_mem_type_manager *man;
1330 if (mem_type >= TTM_NUM_MEM_TYPES) {
1331 printk(KERN_ERR TTM_PFX "Illegal memory type %d\n", mem_type);
1334 man = &bdev->man[mem_type];
1336 if (!man->has_type) {
1337 printk(KERN_ERR TTM_PFX "Trying to take down uninitialized "
1338 "memory manager type %u\n", mem_type);
1342 man->use_type = false;
1343 man->has_type = false;
1347 ttm_bo_force_list_clean(bdev, mem_type, false);
1349 ret = (*man->func->takedown)(man);
1354 EXPORT_SYMBOL(ttm_bo_clean_mm);
1356 int ttm_bo_evict_mm(struct ttm_bo_device *bdev, unsigned mem_type)
1358 struct ttm_mem_type_manager *man = &bdev->man[mem_type];
1360 if (mem_type == 0 || mem_type >= TTM_NUM_MEM_TYPES) {
1361 printk(KERN_ERR TTM_PFX
1362 "Illegal memory manager memory type %u.\n",
1367 if (!man->has_type) {
1368 printk(KERN_ERR TTM_PFX
1369 "Memory type %u has not been initialized.\n",
1374 return ttm_bo_force_list_clean(bdev, mem_type, true);
1376 EXPORT_SYMBOL(ttm_bo_evict_mm);
1378 int ttm_bo_init_mm(struct ttm_bo_device *bdev, unsigned type,
1379 unsigned long p_size)
1382 struct ttm_mem_type_manager *man;
1384 BUG_ON(type >= TTM_NUM_MEM_TYPES);
1385 man = &bdev->man[type];
1386 BUG_ON(man->has_type);
1387 man->io_reserve_fastpath = true;
1388 man->use_io_reserve_lru = false;
1389 mutex_init(&man->io_reserve_mutex);
1390 INIT_LIST_HEAD(&man->io_reserve_lru);
1392 ret = bdev->driver->init_mem_type(bdev, type, man);
1398 if (type != TTM_PL_SYSTEM) {
1399 ret = (*man->func->init)(man, p_size);
1403 man->has_type = true;
1404 man->use_type = true;
1407 INIT_LIST_HEAD(&man->lru);
1411 EXPORT_SYMBOL(ttm_bo_init_mm);
1413 static void ttm_bo_global_kobj_release(struct kobject *kobj)
1415 struct ttm_bo_global *glob =
1416 container_of(kobj, struct ttm_bo_global, kobj);
1418 ttm_mem_unregister_shrink(glob->mem_glob, &glob->shrink);
1419 __free_page(glob->dummy_read_page);
1423 void ttm_bo_global_release(struct drm_global_reference *ref)
1425 struct ttm_bo_global *glob = ref->object;
1427 kobject_del(&glob->kobj);
1428 kobject_put(&glob->kobj);
1430 EXPORT_SYMBOL(ttm_bo_global_release);
1432 int ttm_bo_global_init(struct drm_global_reference *ref)
1434 struct ttm_bo_global_ref *bo_ref =
1435 container_of(ref, struct ttm_bo_global_ref, ref);
1436 struct ttm_bo_global *glob = ref->object;
1439 mutex_init(&glob->device_list_mutex);
1440 spin_lock_init(&glob->lru_lock);
1441 glob->mem_glob = bo_ref->mem_glob;
1442 glob->dummy_read_page = alloc_page(__GFP_ZERO | GFP_DMA32);
1444 if (unlikely(glob->dummy_read_page == NULL)) {
1449 INIT_LIST_HEAD(&glob->swap_lru);
1450 INIT_LIST_HEAD(&glob->device_list);
1452 ttm_mem_init_shrink(&glob->shrink, ttm_bo_swapout);
1453 ret = ttm_mem_register_shrink(glob->mem_glob, &glob->shrink);
1454 if (unlikely(ret != 0)) {
1455 printk(KERN_ERR TTM_PFX
1456 "Could not register buffer object swapout.\n");
1460 glob->ttm_bo_extra_size =
1461 ttm_round_pot(sizeof(struct ttm_tt)) +
1462 ttm_round_pot(sizeof(struct ttm_backend));
1464 glob->ttm_bo_size = glob->ttm_bo_extra_size +
1465 ttm_round_pot(sizeof(struct ttm_buffer_object));
1467 atomic_set(&glob->bo_count, 0);
1469 ret = kobject_init_and_add(
1470 &glob->kobj, &ttm_bo_glob_kobj_type, ttm_get_kobj(), "buffer_objects");
1471 if (unlikely(ret != 0))
1472 kobject_put(&glob->kobj);
1475 __free_page(glob->dummy_read_page);
1480 EXPORT_SYMBOL(ttm_bo_global_init);
1483 int ttm_bo_device_release(struct ttm_bo_device *bdev)
1486 unsigned i = TTM_NUM_MEM_TYPES;
1487 struct ttm_mem_type_manager *man;
1488 struct ttm_bo_global *glob = bdev->glob;
1491 man = &bdev->man[i];
1492 if (man->has_type) {
1493 man->use_type = false;
1494 if ((i != TTM_PL_SYSTEM) && ttm_bo_clean_mm(bdev, i)) {
1496 printk(KERN_ERR TTM_PFX
1497 "DRM memory manager type %d "
1498 "is not clean.\n", i);
1500 man->has_type = false;
1504 mutex_lock(&glob->device_list_mutex);
1505 list_del(&bdev->device_list);
1506 mutex_unlock(&glob->device_list_mutex);
1508 cancel_delayed_work_sync(&bdev->wq);
1510 while (ttm_bo_delayed_delete(bdev, true))
1513 spin_lock(&glob->lru_lock);
1514 if (list_empty(&bdev->ddestroy))
1515 TTM_DEBUG("Delayed destroy list was clean\n");
1517 if (list_empty(&bdev->man[0].lru))
1518 TTM_DEBUG("Swap list was clean\n");
1519 spin_unlock(&glob->lru_lock);
1521 BUG_ON(!drm_mm_clean(&bdev->addr_space_mm));
1522 write_lock(&bdev->vm_lock);
1523 drm_mm_takedown(&bdev->addr_space_mm);
1524 write_unlock(&bdev->vm_lock);
1528 EXPORT_SYMBOL(ttm_bo_device_release);
1530 int ttm_bo_device_init(struct ttm_bo_device *bdev,
1531 struct ttm_bo_global *glob,
1532 struct ttm_bo_driver *driver,
1533 uint64_t file_page_offset,
1538 rwlock_init(&bdev->vm_lock);
1539 bdev->driver = driver;
1541 memset(bdev->man, 0, sizeof(bdev->man));
1544 * Initialize the system memory buffer type.
1545 * Other types need to be driver / IOCTL initialized.
1547 ret = ttm_bo_init_mm(bdev, TTM_PL_SYSTEM, 0);
1548 if (unlikely(ret != 0))
1551 bdev->addr_space_rb = RB_ROOT;
1552 ret = drm_mm_init(&bdev->addr_space_mm, file_page_offset, 0x10000000);
1553 if (unlikely(ret != 0))
1554 goto out_no_addr_mm;
1556 INIT_DELAYED_WORK(&bdev->wq, ttm_bo_delayed_workqueue);
1557 bdev->nice_mode = true;
1558 INIT_LIST_HEAD(&bdev->ddestroy);
1559 bdev->dev_mapping = NULL;
1561 bdev->need_dma32 = need_dma32;
1563 spin_lock_init(&bdev->fence_lock);
1564 mutex_lock(&glob->device_list_mutex);
1565 list_add_tail(&bdev->device_list, &glob->device_list);
1566 mutex_unlock(&glob->device_list_mutex);
1570 ttm_bo_clean_mm(bdev, 0);
1574 EXPORT_SYMBOL(ttm_bo_device_init);
1577 * buffer object vm functions.
1580 bool ttm_mem_reg_is_pci(struct ttm_bo_device *bdev, struct ttm_mem_reg *mem)
1582 struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
1584 if (!(man->flags & TTM_MEMTYPE_FLAG_FIXED)) {
1585 if (mem->mem_type == TTM_PL_SYSTEM)
1588 if (man->flags & TTM_MEMTYPE_FLAG_CMA)
1591 if (mem->placement & TTM_PL_FLAG_CACHED)
1597 void ttm_bo_unmap_virtual_locked(struct ttm_buffer_object *bo)
1599 struct ttm_bo_device *bdev = bo->bdev;
1600 loff_t offset = (loff_t) bo->addr_space_offset;
1601 loff_t holelen = ((loff_t) bo->mem.num_pages) << PAGE_SHIFT;
1603 if (!bdev->dev_mapping)
1605 unmap_mapping_range(bdev->dev_mapping, offset, holelen, 1);
1606 ttm_mem_io_free_vm(bo);
1609 void ttm_bo_unmap_virtual(struct ttm_buffer_object *bo)
1611 struct ttm_bo_device *bdev = bo->bdev;
1612 struct ttm_mem_type_manager *man = &bdev->man[bo->mem.mem_type];
1614 ttm_mem_io_lock(man, false);
1615 ttm_bo_unmap_virtual_locked(bo);
1616 ttm_mem_io_unlock(man);
1620 EXPORT_SYMBOL(ttm_bo_unmap_virtual);
1622 static void ttm_bo_vm_insert_rb(struct ttm_buffer_object *bo)
1624 struct ttm_bo_device *bdev = bo->bdev;
1625 struct rb_node **cur = &bdev->addr_space_rb.rb_node;
1626 struct rb_node *parent = NULL;
1627 struct ttm_buffer_object *cur_bo;
1628 unsigned long offset = bo->vm_node->start;
1629 unsigned long cur_offset;
1633 cur_bo = rb_entry(parent, struct ttm_buffer_object, vm_rb);
1634 cur_offset = cur_bo->vm_node->start;
1635 if (offset < cur_offset)
1636 cur = &parent->rb_left;
1637 else if (offset > cur_offset)
1638 cur = &parent->rb_right;
1643 rb_link_node(&bo->vm_rb, parent, cur);
1644 rb_insert_color(&bo->vm_rb, &bdev->addr_space_rb);
1650 * @bo: the buffer to allocate address space for
1652 * Allocate address space in the drm device so that applications
1653 * can mmap the buffer and access the contents. This only
1654 * applies to ttm_bo_type_device objects as others are not
1655 * placed in the drm device address space.
1658 static int ttm_bo_setup_vm(struct ttm_buffer_object *bo)
1660 struct ttm_bo_device *bdev = bo->bdev;
1664 ret = drm_mm_pre_get(&bdev->addr_space_mm);
1665 if (unlikely(ret != 0))
1668 write_lock(&bdev->vm_lock);
1669 bo->vm_node = drm_mm_search_free(&bdev->addr_space_mm,
1670 bo->mem.num_pages, 0, 0);
1672 if (unlikely(bo->vm_node == NULL)) {
1677 bo->vm_node = drm_mm_get_block_atomic(bo->vm_node,
1678 bo->mem.num_pages, 0);
1680 if (unlikely(bo->vm_node == NULL)) {
1681 write_unlock(&bdev->vm_lock);
1685 ttm_bo_vm_insert_rb(bo);
1686 write_unlock(&bdev->vm_lock);
1687 bo->addr_space_offset = ((uint64_t) bo->vm_node->start) << PAGE_SHIFT;
1691 write_unlock(&bdev->vm_lock);
1695 int ttm_bo_wait(struct ttm_buffer_object *bo,
1696 bool lazy, bool interruptible, bool no_wait)
1698 struct ttm_bo_driver *driver = bo->bdev->driver;
1699 struct ttm_bo_device *bdev = bo->bdev;
1704 if (likely(bo->sync_obj == NULL))
1707 while (bo->sync_obj) {
1709 if (driver->sync_obj_signaled(bo->sync_obj, bo->sync_obj_arg)) {
1710 void *tmp_obj = bo->sync_obj;
1711 bo->sync_obj = NULL;
1712 clear_bit(TTM_BO_PRIV_FLAG_MOVING, &bo->priv_flags);
1713 spin_unlock(&bdev->fence_lock);
1714 driver->sync_obj_unref(&tmp_obj);
1715 spin_lock(&bdev->fence_lock);
1722 sync_obj = driver->sync_obj_ref(bo->sync_obj);
1723 sync_obj_arg = bo->sync_obj_arg;
1724 spin_unlock(&bdev->fence_lock);
1725 ret = driver->sync_obj_wait(sync_obj, sync_obj_arg,
1726 lazy, interruptible);
1727 if (unlikely(ret != 0)) {
1728 driver->sync_obj_unref(&sync_obj);
1729 spin_lock(&bdev->fence_lock);
1732 spin_lock(&bdev->fence_lock);
1733 if (likely(bo->sync_obj == sync_obj &&
1734 bo->sync_obj_arg == sync_obj_arg)) {
1735 void *tmp_obj = bo->sync_obj;
1736 bo->sync_obj = NULL;
1737 clear_bit(TTM_BO_PRIV_FLAG_MOVING,
1739 spin_unlock(&bdev->fence_lock);
1740 driver->sync_obj_unref(&sync_obj);
1741 driver->sync_obj_unref(&tmp_obj);
1742 spin_lock(&bdev->fence_lock);
1744 spin_unlock(&bdev->fence_lock);
1745 driver->sync_obj_unref(&sync_obj);
1746 spin_lock(&bdev->fence_lock);
1751 EXPORT_SYMBOL(ttm_bo_wait);
1753 int ttm_bo_synccpu_write_grab(struct ttm_buffer_object *bo, bool no_wait)
1755 struct ttm_bo_device *bdev = bo->bdev;
1759 * Using ttm_bo_reserve makes sure the lru lists are updated.
1762 ret = ttm_bo_reserve(bo, true, no_wait, false, 0);
1763 if (unlikely(ret != 0))
1765 spin_lock(&bdev->fence_lock);
1766 ret = ttm_bo_wait(bo, false, true, no_wait);
1767 spin_unlock(&bdev->fence_lock);
1768 if (likely(ret == 0))
1769 atomic_inc(&bo->cpu_writers);
1770 ttm_bo_unreserve(bo);
1773 EXPORT_SYMBOL(ttm_bo_synccpu_write_grab);
1775 void ttm_bo_synccpu_write_release(struct ttm_buffer_object *bo)
1777 if (atomic_dec_and_test(&bo->cpu_writers))
1778 wake_up_all(&bo->event_queue);
1780 EXPORT_SYMBOL(ttm_bo_synccpu_write_release);
1783 * A buffer object shrink method that tries to swap out the first
1784 * buffer object on the bo_global::swap_lru list.
1787 static int ttm_bo_swapout(struct ttm_mem_shrink *shrink)
1789 struct ttm_bo_global *glob =
1790 container_of(shrink, struct ttm_bo_global, shrink);
1791 struct ttm_buffer_object *bo;
1794 uint32_t swap_placement = (TTM_PL_FLAG_CACHED | TTM_PL_FLAG_SYSTEM);
1796 spin_lock(&glob->lru_lock);
1797 while (ret == -EBUSY) {
1798 if (unlikely(list_empty(&glob->swap_lru))) {
1799 spin_unlock(&glob->lru_lock);
1803 bo = list_first_entry(&glob->swap_lru,
1804 struct ttm_buffer_object, swap);
1805 kref_get(&bo->list_kref);
1807 if (!list_empty(&bo->ddestroy)) {
1808 spin_unlock(&glob->lru_lock);
1809 (void) ttm_bo_cleanup_refs(bo, false, false, false);
1810 kref_put(&bo->list_kref, ttm_bo_release_list);
1815 * Reserve buffer. Since we unlock while sleeping, we need
1816 * to re-check that nobody removed us from the swap-list while
1820 ret = ttm_bo_reserve_locked(bo, false, true, false, 0);
1821 if (unlikely(ret == -EBUSY)) {
1822 spin_unlock(&glob->lru_lock);
1823 ttm_bo_wait_unreserved(bo, false);
1824 kref_put(&bo->list_kref, ttm_bo_release_list);
1825 spin_lock(&glob->lru_lock);
1830 put_count = ttm_bo_del_from_lru(bo);
1831 spin_unlock(&glob->lru_lock);
1833 ttm_bo_list_ref_sub(bo, put_count, true);
1836 * Wait for GPU, then move to system cached.
1839 spin_lock(&bo->bdev->fence_lock);
1840 ret = ttm_bo_wait(bo, false, false, false);
1841 spin_unlock(&bo->bdev->fence_lock);
1843 if (unlikely(ret != 0))
1846 if ((bo->mem.placement & swap_placement) != swap_placement) {
1847 struct ttm_mem_reg evict_mem;
1849 evict_mem = bo->mem;
1850 evict_mem.mm_node = NULL;
1851 evict_mem.placement = TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED;
1852 evict_mem.mem_type = TTM_PL_SYSTEM;
1854 ret = ttm_bo_handle_move_mem(bo, &evict_mem, true,
1855 false, false, false);
1856 if (unlikely(ret != 0))
1860 ttm_bo_unmap_virtual(bo);
1863 * Swap out. Buffer will be swapped in again as soon as
1864 * anyone tries to access a ttm page.
1867 if (bo->bdev->driver->swap_notify)
1868 bo->bdev->driver->swap_notify(bo);
1870 ret = ttm_tt_swapout(bo->ttm, bo->persistent_swap_storage);
1875 * Unreserve without putting on LRU to avoid swapping out an
1876 * already swapped buffer.
1879 atomic_set(&bo->reserved, 0);
1880 wake_up_all(&bo->event_queue);
1881 kref_put(&bo->list_kref, ttm_bo_release_list);
1885 void ttm_bo_swapout_all(struct ttm_bo_device *bdev)
1887 while (ttm_bo_swapout(&bdev->glob->shrink) == 0)
1890 EXPORT_SYMBOL(ttm_bo_swapout_all);