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>
32 * We store bo pointer in drm_mm_node struct so we know which bo own a
33 * specific node. There is no protection on the pointer, thus to make
34 * sure things don't go berserk you have to access this pointer while
35 * holding the global lru lock and make sure anytime you free a node you
36 * reset the pointer to NULL.
39 #include "ttm/ttm_module.h"
40 #include "ttm/ttm_bo_driver.h"
41 #include "ttm/ttm_placement.h"
42 #include <linux/jiffies.h>
43 #include <linux/slab.h>
44 #include <linux/sched.h>
46 #include <linux/file.h>
47 #include <linux/module.h>
49 #define TTM_ASSERT_LOCKED(param)
50 #define TTM_DEBUG(fmt, arg...)
51 #define TTM_BO_HASH_ORDER 13
53 static int ttm_bo_setup_vm(struct ttm_buffer_object *bo);
54 static int ttm_bo_swapout(struct ttm_mem_shrink *shrink);
55 static void ttm_bo_global_kobj_release(struct kobject *kobj);
57 static struct attribute ttm_bo_count = {
62 static inline int ttm_mem_type_from_flags(uint32_t flags, uint32_t *mem_type)
66 for (i = 0; i <= TTM_PL_PRIV5; i++)
67 if (flags & (1 << i)) {
74 static void ttm_mem_type_debug(struct ttm_bo_device *bdev, int mem_type)
76 struct ttm_mem_type_manager *man = &bdev->man[mem_type];
78 printk(KERN_ERR TTM_PFX " has_type: %d\n", man->has_type);
79 printk(KERN_ERR TTM_PFX " use_type: %d\n", man->use_type);
80 printk(KERN_ERR TTM_PFX " flags: 0x%08X\n", man->flags);
81 printk(KERN_ERR TTM_PFX " gpu_offset: 0x%08lX\n", man->gpu_offset);
82 printk(KERN_ERR TTM_PFX " size: %llu\n", man->size);
83 printk(KERN_ERR TTM_PFX " available_caching: 0x%08X\n",
84 man->available_caching);
85 printk(KERN_ERR TTM_PFX " default_caching: 0x%08X\n",
86 man->default_caching);
87 if (mem_type != TTM_PL_SYSTEM)
88 (*man->func->debug)(man, TTM_PFX);
91 static void ttm_bo_mem_space_debug(struct ttm_buffer_object *bo,
92 struct ttm_placement *placement)
96 printk(KERN_ERR TTM_PFX "No space for %p (%lu pages, %luK, %luM)\n",
97 bo, bo->mem.num_pages, bo->mem.size >> 10,
99 for (i = 0; i < placement->num_placement; i++) {
100 ret = ttm_mem_type_from_flags(placement->placement[i],
104 printk(KERN_ERR TTM_PFX " placement[%d]=0x%08X (%d)\n",
105 i, placement->placement[i], mem_type);
106 ttm_mem_type_debug(bo->bdev, mem_type);
110 static ssize_t ttm_bo_global_show(struct kobject *kobj,
111 struct attribute *attr,
114 struct ttm_bo_global *glob =
115 container_of(kobj, struct ttm_bo_global, kobj);
117 return snprintf(buffer, PAGE_SIZE, "%lu\n",
118 (unsigned long) atomic_read(&glob->bo_count));
121 static struct attribute *ttm_bo_global_attrs[] = {
126 static const struct sysfs_ops ttm_bo_global_ops = {
127 .show = &ttm_bo_global_show
130 static struct kobj_type ttm_bo_glob_kobj_type = {
131 .release = &ttm_bo_global_kobj_release,
132 .sysfs_ops = &ttm_bo_global_ops,
133 .default_attrs = ttm_bo_global_attrs
137 static inline uint32_t ttm_bo_type_flags(unsigned type)
142 static void ttm_bo_release_list(struct kref *list_kref)
144 struct ttm_buffer_object *bo =
145 container_of(list_kref, struct ttm_buffer_object, list_kref);
146 struct ttm_bo_device *bdev = bo->bdev;
148 BUG_ON(atomic_read(&bo->list_kref.refcount));
149 BUG_ON(atomic_read(&bo->kref.refcount));
150 BUG_ON(atomic_read(&bo->cpu_writers));
151 BUG_ON(bo->sync_obj != NULL);
152 BUG_ON(bo->mem.mm_node != NULL);
153 BUG_ON(!list_empty(&bo->lru));
154 BUG_ON(!list_empty(&bo->ddestroy));
157 ttm_tt_destroy(bo->ttm);
158 atomic_dec(&bo->glob->bo_count);
162 ttm_mem_global_free(bdev->glob->mem_glob, bo->acc_size);
167 int ttm_bo_wait_unreserved(struct ttm_buffer_object *bo, bool interruptible)
170 return wait_event_interruptible(bo->event_queue,
171 atomic_read(&bo->reserved) == 0);
173 wait_event(bo->event_queue, atomic_read(&bo->reserved) == 0);
177 EXPORT_SYMBOL(ttm_bo_wait_unreserved);
179 static void ttm_bo_add_to_lru(struct ttm_buffer_object *bo)
181 struct ttm_bo_device *bdev = bo->bdev;
182 struct ttm_mem_type_manager *man;
184 BUG_ON(!atomic_read(&bo->reserved));
186 if (!(bo->mem.placement & TTM_PL_FLAG_NO_EVICT)) {
188 BUG_ON(!list_empty(&bo->lru));
190 man = &bdev->man[bo->mem.mem_type];
191 list_add_tail(&bo->lru, &man->lru);
192 kref_get(&bo->list_kref);
194 if (bo->ttm != NULL) {
195 list_add_tail(&bo->swap, &bo->glob->swap_lru);
196 kref_get(&bo->list_kref);
202 * Call with the lru_lock held.
205 static int ttm_bo_del_from_lru(struct ttm_buffer_object *bo)
209 if (!list_empty(&bo->swap)) {
210 list_del_init(&bo->swap);
213 if (!list_empty(&bo->lru)) {
214 list_del_init(&bo->lru);
219 * TODO: Add a driver hook to delete from
220 * driver-specific LRU's here.
226 int ttm_bo_reserve_locked(struct ttm_buffer_object *bo,
228 bool no_wait, bool use_sequence, uint32_t sequence)
230 struct ttm_bo_global *glob = bo->glob;
233 while (unlikely(atomic_cmpxchg(&bo->reserved, 0, 1) != 0)) {
234 if (use_sequence && bo->seq_valid &&
235 (sequence - bo->val_seq < (1 << 31))) {
242 spin_unlock(&glob->lru_lock);
243 ret = ttm_bo_wait_unreserved(bo, interruptible);
244 spin_lock(&glob->lru_lock);
251 bo->val_seq = sequence;
252 bo->seq_valid = true;
254 bo->seq_valid = false;
259 EXPORT_SYMBOL(ttm_bo_reserve);
261 static void ttm_bo_ref_bug(struct kref *list_kref)
266 int ttm_bo_reserve(struct ttm_buffer_object *bo,
268 bool no_wait, bool use_sequence, uint32_t sequence)
270 struct ttm_bo_global *glob = bo->glob;
274 spin_lock(&glob->lru_lock);
275 ret = ttm_bo_reserve_locked(bo, interruptible, no_wait, use_sequence,
277 if (likely(ret == 0))
278 put_count = ttm_bo_del_from_lru(bo);
279 spin_unlock(&glob->lru_lock);
282 kref_put(&bo->list_kref, ttm_bo_ref_bug);
287 void ttm_bo_unreserve(struct ttm_buffer_object *bo)
289 struct ttm_bo_global *glob = bo->glob;
291 spin_lock(&glob->lru_lock);
292 ttm_bo_add_to_lru(bo);
293 atomic_set(&bo->reserved, 0);
294 wake_up_all(&bo->event_queue);
295 spin_unlock(&glob->lru_lock);
297 EXPORT_SYMBOL(ttm_bo_unreserve);
300 * Call bo->mutex locked.
302 static int ttm_bo_add_ttm(struct ttm_buffer_object *bo, bool zero_alloc)
304 struct ttm_bo_device *bdev = bo->bdev;
305 struct ttm_bo_global *glob = bo->glob;
307 uint32_t page_flags = 0;
309 TTM_ASSERT_LOCKED(&bo->mutex);
312 if (bdev->need_dma32)
313 page_flags |= TTM_PAGE_FLAG_DMA32;
316 case ttm_bo_type_device:
318 page_flags |= TTM_PAGE_FLAG_ZERO_ALLOC;
319 case ttm_bo_type_kernel:
320 bo->ttm = ttm_tt_create(bdev, bo->num_pages << PAGE_SHIFT,
321 page_flags, glob->dummy_read_page);
322 if (unlikely(bo->ttm == NULL))
325 case ttm_bo_type_user:
326 bo->ttm = ttm_tt_create(bdev, bo->num_pages << PAGE_SHIFT,
327 page_flags | TTM_PAGE_FLAG_USER,
328 glob->dummy_read_page);
329 if (unlikely(bo->ttm == NULL)) {
334 ret = ttm_tt_set_user(bo->ttm, current,
335 bo->buffer_start, bo->num_pages);
336 if (unlikely(ret != 0))
337 ttm_tt_destroy(bo->ttm);
340 printk(KERN_ERR TTM_PFX "Illegal buffer object type\n");
348 static int ttm_bo_handle_move_mem(struct ttm_buffer_object *bo,
349 struct ttm_mem_reg *mem,
350 bool evict, bool interruptible,
351 bool no_wait_reserve, bool no_wait_gpu)
353 struct ttm_bo_device *bdev = bo->bdev;
354 bool old_is_pci = ttm_mem_reg_is_pci(bdev, &bo->mem);
355 bool new_is_pci = ttm_mem_reg_is_pci(bdev, mem);
356 struct ttm_mem_type_manager *old_man = &bdev->man[bo->mem.mem_type];
357 struct ttm_mem_type_manager *new_man = &bdev->man[mem->mem_type];
360 if (old_is_pci || new_is_pci ||
361 ((mem->placement & bo->mem.placement & TTM_PL_MASK_CACHING) == 0))
362 ttm_bo_unmap_virtual(bo);
365 * Create and bind a ttm if required.
368 if (!(new_man->flags & TTM_MEMTYPE_FLAG_FIXED) && (bo->ttm == NULL)) {
369 ret = ttm_bo_add_ttm(bo, false);
373 ret = ttm_tt_set_placement_caching(bo->ttm, mem->placement);
377 if (mem->mem_type != TTM_PL_SYSTEM) {
378 ret = ttm_tt_bind(bo->ttm, mem);
383 if (bo->mem.mem_type == TTM_PL_SYSTEM) {
391 if (bdev->driver->move_notify)
392 bdev->driver->move_notify(bo, mem);
394 if (!(old_man->flags & TTM_MEMTYPE_FLAG_FIXED) &&
395 !(new_man->flags & TTM_MEMTYPE_FLAG_FIXED))
396 ret = ttm_bo_move_ttm(bo, evict, no_wait_reserve, no_wait_gpu, mem);
397 else if (bdev->driver->move)
398 ret = bdev->driver->move(bo, evict, interruptible,
399 no_wait_reserve, no_wait_gpu, mem);
401 ret = ttm_bo_move_memcpy(bo, evict, no_wait_reserve, no_wait_gpu, mem);
408 ret = bdev->driver->invalidate_caches(bdev, bo->mem.placement);
410 printk(KERN_ERR TTM_PFX "Can not flush read caches\n");
414 if (bo->mem.mm_node) {
415 spin_lock(&bo->lock);
416 bo->offset = (bo->mem.start << PAGE_SHIFT) +
417 bdev->man[bo->mem.mem_type].gpu_offset;
418 bo->cur_placement = bo->mem.placement;
419 spin_unlock(&bo->lock);
426 new_man = &bdev->man[bo->mem.mem_type];
427 if ((new_man->flags & TTM_MEMTYPE_FLAG_FIXED) && bo->ttm) {
428 ttm_tt_unbind(bo->ttm);
429 ttm_tt_destroy(bo->ttm);
438 * Will release GPU memory type usage on destruction.
439 * This is the place to put in driver specific hooks to release
440 * driver private resources.
441 * Will release the bo::reserved lock.
444 static void ttm_bo_cleanup_memtype_use(struct ttm_buffer_object *bo)
447 ttm_tt_unbind(bo->ttm);
448 ttm_tt_destroy(bo->ttm);
452 ttm_bo_mem_put(bo, &bo->mem);
454 atomic_set(&bo->reserved, 0);
455 wake_up_all(&bo->event_queue);
458 static void ttm_bo_cleanup_refs_or_queue(struct ttm_buffer_object *bo)
460 struct ttm_bo_device *bdev = bo->bdev;
461 struct ttm_bo_global *glob = bo->glob;
462 struct ttm_bo_driver *driver;
468 spin_lock(&bo->lock);
469 (void) ttm_bo_wait(bo, false, false, true);
472 spin_lock(&glob->lru_lock);
475 * Lock inversion between bo::reserve and bo::lock here,
476 * but that's OK, since we're only trylocking.
479 ret = ttm_bo_reserve_locked(bo, false, true, false, 0);
481 if (unlikely(ret == -EBUSY))
484 spin_unlock(&bo->lock);
485 put_count = ttm_bo_del_from_lru(bo);
487 spin_unlock(&glob->lru_lock);
488 ttm_bo_cleanup_memtype_use(bo);
491 kref_put(&bo->list_kref, ttm_bo_ref_bug);
495 spin_lock(&glob->lru_lock);
498 sync_obj = bo->sync_obj;
499 sync_obj_arg = bo->sync_obj_arg;
500 driver = bdev->driver;
502 kref_get(&bo->list_kref);
503 list_add_tail(&bo->ddestroy, &bdev->ddestroy);
504 spin_unlock(&glob->lru_lock);
505 spin_unlock(&bo->lock);
508 driver->sync_obj_flush(sync_obj, sync_obj_arg);
509 schedule_delayed_work(&bdev->wq,
510 ((HZ / 100) < 1) ? 1 : HZ / 100);
514 * function ttm_bo_cleanup_refs
515 * If bo idle, remove from delayed- and lru lists, and unref.
516 * If not idle, do nothing.
518 * @interruptible Any sleeps should occur interruptibly.
519 * @no_wait_reserve Never wait for reserve. Return -EBUSY instead.
520 * @no_wait_gpu Never wait for gpu. Return -EBUSY instead.
523 static int ttm_bo_cleanup_refs(struct ttm_buffer_object *bo,
525 bool no_wait_reserve,
528 struct ttm_bo_global *glob = bo->glob;
533 spin_lock(&bo->lock);
534 ret = ttm_bo_wait(bo, false, interruptible, no_wait_gpu);
535 spin_unlock(&bo->lock);
537 if (unlikely(ret != 0))
540 spin_lock(&glob->lru_lock);
541 ret = ttm_bo_reserve_locked(bo, interruptible,
542 no_wait_reserve, false, 0);
544 if (unlikely(ret != 0) || list_empty(&bo->ddestroy)) {
545 spin_unlock(&glob->lru_lock);
550 * We can re-check for sync object without taking
551 * the bo::lock since setting the sync object requires
552 * also bo::reserved. A busy object at this point may
553 * be caused by another thread recently starting an accelerated
557 if (unlikely(bo->sync_obj)) {
558 atomic_set(&bo->reserved, 0);
559 wake_up_all(&bo->event_queue);
560 spin_unlock(&glob->lru_lock);
564 put_count = ttm_bo_del_from_lru(bo);
565 list_del_init(&bo->ddestroy);
568 spin_unlock(&glob->lru_lock);
569 ttm_bo_cleanup_memtype_use(bo);
572 kref_put(&bo->list_kref, ttm_bo_ref_bug);
578 * Traverse the delayed list, and call ttm_bo_cleanup_refs on all
579 * encountered buffers.
582 static int ttm_bo_delayed_delete(struct ttm_bo_device *bdev, bool remove_all)
584 struct ttm_bo_global *glob = bdev->glob;
585 struct ttm_buffer_object *entry = NULL;
588 spin_lock(&glob->lru_lock);
589 if (list_empty(&bdev->ddestroy))
592 entry = list_first_entry(&bdev->ddestroy,
593 struct ttm_buffer_object, ddestroy);
594 kref_get(&entry->list_kref);
597 struct ttm_buffer_object *nentry = NULL;
599 if (entry->ddestroy.next != &bdev->ddestroy) {
600 nentry = list_first_entry(&entry->ddestroy,
601 struct ttm_buffer_object, ddestroy);
602 kref_get(&nentry->list_kref);
605 spin_unlock(&glob->lru_lock);
606 ret = ttm_bo_cleanup_refs(entry, false, !remove_all,
608 kref_put(&entry->list_kref, ttm_bo_release_list);
614 spin_lock(&glob->lru_lock);
615 if (list_empty(&entry->ddestroy))
620 spin_unlock(&glob->lru_lock);
623 kref_put(&entry->list_kref, ttm_bo_release_list);
627 static void ttm_bo_delayed_workqueue(struct work_struct *work)
629 struct ttm_bo_device *bdev =
630 container_of(work, struct ttm_bo_device, wq.work);
632 if (ttm_bo_delayed_delete(bdev, false)) {
633 schedule_delayed_work(&bdev->wq,
634 ((HZ / 100) < 1) ? 1 : HZ / 100);
638 static void ttm_bo_release(struct kref *kref)
640 struct ttm_buffer_object *bo =
641 container_of(kref, struct ttm_buffer_object, kref);
642 struct ttm_bo_device *bdev = bo->bdev;
644 if (likely(bo->vm_node != NULL)) {
645 rb_erase(&bo->vm_rb, &bdev->addr_space_rb);
646 drm_mm_put_block(bo->vm_node);
649 write_unlock(&bdev->vm_lock);
650 ttm_bo_cleanup_refs_or_queue(bo);
651 kref_put(&bo->list_kref, ttm_bo_release_list);
652 write_lock(&bdev->vm_lock);
655 void ttm_bo_unref(struct ttm_buffer_object **p_bo)
657 struct ttm_buffer_object *bo = *p_bo;
658 struct ttm_bo_device *bdev = bo->bdev;
661 write_lock(&bdev->vm_lock);
662 kref_put(&bo->kref, ttm_bo_release);
663 write_unlock(&bdev->vm_lock);
665 EXPORT_SYMBOL(ttm_bo_unref);
667 int ttm_bo_lock_delayed_workqueue(struct ttm_bo_device *bdev)
669 return cancel_delayed_work_sync(&bdev->wq);
671 EXPORT_SYMBOL(ttm_bo_lock_delayed_workqueue);
673 void ttm_bo_unlock_delayed_workqueue(struct ttm_bo_device *bdev, int resched)
676 schedule_delayed_work(&bdev->wq,
677 ((HZ / 100) < 1) ? 1 : HZ / 100);
679 EXPORT_SYMBOL(ttm_bo_unlock_delayed_workqueue);
681 static int ttm_bo_evict(struct ttm_buffer_object *bo, bool interruptible,
682 bool no_wait_reserve, bool no_wait_gpu)
684 struct ttm_bo_device *bdev = bo->bdev;
685 struct ttm_mem_reg evict_mem;
686 struct ttm_placement placement;
689 spin_lock(&bo->lock);
690 ret = ttm_bo_wait(bo, false, interruptible, no_wait_gpu);
691 spin_unlock(&bo->lock);
693 if (unlikely(ret != 0)) {
694 if (ret != -ERESTARTSYS) {
695 printk(KERN_ERR TTM_PFX
696 "Failed to expire sync object before "
697 "buffer eviction.\n");
702 BUG_ON(!atomic_read(&bo->reserved));
705 evict_mem.mm_node = NULL;
706 evict_mem.bus.io_reserved = false;
710 placement.num_placement = 0;
711 placement.num_busy_placement = 0;
712 bdev->driver->evict_flags(bo, &placement);
713 ret = ttm_bo_mem_space(bo, &placement, &evict_mem, interruptible,
714 no_wait_reserve, no_wait_gpu);
716 if (ret != -ERESTARTSYS) {
717 printk(KERN_ERR TTM_PFX
718 "Failed to find memory space for "
719 "buffer 0x%p eviction.\n", bo);
720 ttm_bo_mem_space_debug(bo, &placement);
725 ret = ttm_bo_handle_move_mem(bo, &evict_mem, true, interruptible,
726 no_wait_reserve, no_wait_gpu);
728 if (ret != -ERESTARTSYS)
729 printk(KERN_ERR TTM_PFX "Buffer eviction failed\n");
730 ttm_bo_mem_put(bo, &evict_mem);
738 static int ttm_mem_evict_first(struct ttm_bo_device *bdev,
740 bool interruptible, bool no_wait_reserve,
743 struct ttm_bo_global *glob = bdev->glob;
744 struct ttm_mem_type_manager *man = &bdev->man[mem_type];
745 struct ttm_buffer_object *bo;
746 int ret, put_count = 0;
749 spin_lock(&glob->lru_lock);
750 if (list_empty(&man->lru)) {
751 spin_unlock(&glob->lru_lock);
755 bo = list_first_entry(&man->lru, struct ttm_buffer_object, lru);
756 kref_get(&bo->list_kref);
758 if (!list_empty(&bo->ddestroy)) {
759 spin_unlock(&glob->lru_lock);
760 ret = ttm_bo_cleanup_refs(bo, interruptible,
761 no_wait_reserve, no_wait_gpu);
762 kref_put(&bo->list_kref, ttm_bo_release_list);
764 if (likely(ret == 0 || ret == -ERESTARTSYS))
770 ret = ttm_bo_reserve_locked(bo, false, no_wait_reserve, false, 0);
772 if (unlikely(ret == -EBUSY)) {
773 spin_unlock(&glob->lru_lock);
774 if (likely(!no_wait_gpu))
775 ret = ttm_bo_wait_unreserved(bo, interruptible);
777 kref_put(&bo->list_kref, ttm_bo_release_list);
780 * We *need* to retry after releasing the lru lock.
783 if (unlikely(ret != 0))
788 put_count = ttm_bo_del_from_lru(bo);
789 spin_unlock(&glob->lru_lock);
794 kref_put(&bo->list_kref, ttm_bo_ref_bug);
796 ret = ttm_bo_evict(bo, interruptible, no_wait_reserve, no_wait_gpu);
797 ttm_bo_unreserve(bo);
799 kref_put(&bo->list_kref, ttm_bo_release_list);
803 void ttm_bo_mem_put(struct ttm_buffer_object *bo, struct ttm_mem_reg *mem)
805 struct ttm_mem_type_manager *man = &bo->bdev->man[mem->mem_type];
808 (*man->func->put_node)(man, mem);
810 EXPORT_SYMBOL(ttm_bo_mem_put);
813 * Repeatedly evict memory from the LRU for @mem_type until we create enough
814 * space, or we've evicted everything and there isn't enough space.
816 static int ttm_bo_mem_force_space(struct ttm_buffer_object *bo,
818 struct ttm_placement *placement,
819 struct ttm_mem_reg *mem,
821 bool no_wait_reserve,
824 struct ttm_bo_device *bdev = bo->bdev;
825 struct ttm_bo_global *glob = bdev->glob;
826 struct ttm_mem_type_manager *man = &bdev->man[mem_type];
830 ret = (*man->func->get_node)(man, bo, placement, mem);
831 if (unlikely(ret != 0))
835 spin_lock(&glob->lru_lock);
836 if (list_empty(&man->lru)) {
837 spin_unlock(&glob->lru_lock);
840 spin_unlock(&glob->lru_lock);
841 ret = ttm_mem_evict_first(bdev, mem_type, interruptible,
842 no_wait_reserve, no_wait_gpu);
843 if (unlikely(ret != 0))
846 if (mem->mm_node == NULL)
848 mem->mem_type = mem_type;
852 static uint32_t ttm_bo_select_caching(struct ttm_mem_type_manager *man,
853 uint32_t cur_placement,
854 uint32_t proposed_placement)
856 uint32_t caching = proposed_placement & TTM_PL_MASK_CACHING;
857 uint32_t result = proposed_placement & ~TTM_PL_MASK_CACHING;
860 * Keep current caching if possible.
863 if ((cur_placement & caching) != 0)
864 result |= (cur_placement & caching);
865 else if ((man->default_caching & caching) != 0)
866 result |= man->default_caching;
867 else if ((TTM_PL_FLAG_CACHED & caching) != 0)
868 result |= TTM_PL_FLAG_CACHED;
869 else if ((TTM_PL_FLAG_WC & caching) != 0)
870 result |= TTM_PL_FLAG_WC;
871 else if ((TTM_PL_FLAG_UNCACHED & caching) != 0)
872 result |= TTM_PL_FLAG_UNCACHED;
877 static bool ttm_bo_mt_compatible(struct ttm_mem_type_manager *man,
880 uint32_t proposed_placement,
881 uint32_t *masked_placement)
883 uint32_t cur_flags = ttm_bo_type_flags(mem_type);
885 if ((man->flags & TTM_MEMTYPE_FLAG_FIXED) && disallow_fixed)
888 if ((cur_flags & proposed_placement & TTM_PL_MASK_MEM) == 0)
891 if ((proposed_placement & man->available_caching) == 0)
894 cur_flags |= (proposed_placement & man->available_caching);
896 *masked_placement = cur_flags;
901 * Creates space for memory region @mem according to its type.
903 * This function first searches for free space in compatible memory types in
904 * the priority order defined by the driver. If free space isn't found, then
905 * ttm_bo_mem_force_space is attempted in priority order to evict and find
908 int ttm_bo_mem_space(struct ttm_buffer_object *bo,
909 struct ttm_placement *placement,
910 struct ttm_mem_reg *mem,
911 bool interruptible, bool no_wait_reserve,
914 struct ttm_bo_device *bdev = bo->bdev;
915 struct ttm_mem_type_manager *man;
916 uint32_t mem_type = TTM_PL_SYSTEM;
917 uint32_t cur_flags = 0;
918 bool type_found = false;
919 bool type_ok = false;
920 bool has_erestartsys = false;
924 for (i = 0; i < placement->num_placement; ++i) {
925 ret = ttm_mem_type_from_flags(placement->placement[i],
929 man = &bdev->man[mem_type];
931 type_ok = ttm_bo_mt_compatible(man,
932 bo->type == ttm_bo_type_user,
934 placement->placement[i],
940 cur_flags = ttm_bo_select_caching(man, bo->mem.placement,
943 * Use the access and other non-mapping-related flag bits from
944 * the memory placement flags to the current flags
946 ttm_flag_masked(&cur_flags, placement->placement[i],
947 ~TTM_PL_MASK_MEMTYPE);
949 if (mem_type == TTM_PL_SYSTEM)
952 if (man->has_type && man->use_type) {
954 ret = (*man->func->get_node)(man, bo, placement, mem);
962 if ((type_ok && (mem_type == TTM_PL_SYSTEM)) || mem->mm_node) {
963 mem->mem_type = mem_type;
964 mem->placement = cur_flags;
971 for (i = 0; i < placement->num_busy_placement; ++i) {
972 ret = ttm_mem_type_from_flags(placement->busy_placement[i],
976 man = &bdev->man[mem_type];
979 if (!ttm_bo_mt_compatible(man,
980 bo->type == ttm_bo_type_user,
982 placement->busy_placement[i],
986 cur_flags = ttm_bo_select_caching(man, bo->mem.placement,
989 * Use the access and other non-mapping-related flag bits from
990 * the memory placement flags to the current flags
992 ttm_flag_masked(&cur_flags, placement->busy_placement[i],
993 ~TTM_PL_MASK_MEMTYPE);
996 if (mem_type == TTM_PL_SYSTEM) {
997 mem->mem_type = mem_type;
998 mem->placement = cur_flags;
1003 ret = ttm_bo_mem_force_space(bo, mem_type, placement, mem,
1004 interruptible, no_wait_reserve, no_wait_gpu);
1005 if (ret == 0 && mem->mm_node) {
1006 mem->placement = cur_flags;
1009 if (ret == -ERESTARTSYS)
1010 has_erestartsys = true;
1012 ret = (has_erestartsys) ? -ERESTARTSYS : -ENOMEM;
1015 EXPORT_SYMBOL(ttm_bo_mem_space);
1017 int ttm_bo_wait_cpu(struct ttm_buffer_object *bo, bool no_wait)
1019 if ((atomic_read(&bo->cpu_writers) > 0) && no_wait)
1022 return wait_event_interruptible(bo->event_queue,
1023 atomic_read(&bo->cpu_writers) == 0);
1025 EXPORT_SYMBOL(ttm_bo_wait_cpu);
1027 int ttm_bo_move_buffer(struct ttm_buffer_object *bo,
1028 struct ttm_placement *placement,
1029 bool interruptible, bool no_wait_reserve,
1033 struct ttm_mem_reg mem;
1035 BUG_ON(!atomic_read(&bo->reserved));
1038 * FIXME: It's possible to pipeline buffer moves.
1039 * Have the driver move function wait for idle when necessary,
1040 * instead of doing it here.
1042 spin_lock(&bo->lock);
1043 ret = ttm_bo_wait(bo, false, interruptible, no_wait_gpu);
1044 spin_unlock(&bo->lock);
1047 mem.num_pages = bo->num_pages;
1048 mem.size = mem.num_pages << PAGE_SHIFT;
1049 mem.page_alignment = bo->mem.page_alignment;
1050 mem.bus.io_reserved = false;
1052 * Determine where to move the buffer.
1054 ret = ttm_bo_mem_space(bo, placement, &mem, interruptible, no_wait_reserve, no_wait_gpu);
1057 ret = ttm_bo_handle_move_mem(bo, &mem, false, interruptible, no_wait_reserve, no_wait_gpu);
1059 if (ret && mem.mm_node)
1060 ttm_bo_mem_put(bo, &mem);
1064 static int ttm_bo_mem_compat(struct ttm_placement *placement,
1065 struct ttm_mem_reg *mem)
1069 if (mem->mm_node && placement->lpfn != 0 &&
1070 (mem->start < placement->fpfn ||
1071 mem->start + mem->num_pages > placement->lpfn))
1074 for (i = 0; i < placement->num_placement; i++) {
1075 if ((placement->placement[i] & mem->placement &
1076 TTM_PL_MASK_CACHING) &&
1077 (placement->placement[i] & mem->placement &
1084 int ttm_bo_validate(struct ttm_buffer_object *bo,
1085 struct ttm_placement *placement,
1086 bool interruptible, bool no_wait_reserve,
1091 BUG_ON(!atomic_read(&bo->reserved));
1092 /* Check that range is valid */
1093 if (placement->lpfn || placement->fpfn)
1094 if (placement->fpfn > placement->lpfn ||
1095 (placement->lpfn - placement->fpfn) < bo->num_pages)
1098 * Check whether we need to move buffer.
1100 ret = ttm_bo_mem_compat(placement, &bo->mem);
1102 ret = ttm_bo_move_buffer(bo, placement, interruptible, no_wait_reserve, no_wait_gpu);
1107 * Use the access and other non-mapping-related flag bits from
1108 * the compatible memory placement flags to the active flags
1110 ttm_flag_masked(&bo->mem.placement, placement->placement[ret],
1111 ~TTM_PL_MASK_MEMTYPE);
1114 * We might need to add a TTM.
1116 if (bo->mem.mem_type == TTM_PL_SYSTEM && bo->ttm == NULL) {
1117 ret = ttm_bo_add_ttm(bo, true);
1123 EXPORT_SYMBOL(ttm_bo_validate);
1125 int ttm_bo_check_placement(struct ttm_buffer_object *bo,
1126 struct ttm_placement *placement)
1130 if (placement->fpfn || placement->lpfn) {
1131 if (bo->mem.num_pages > (placement->lpfn - placement->fpfn)) {
1132 printk(KERN_ERR TTM_PFX "Page number range to small "
1133 "Need %lu pages, range is [%u, %u]\n",
1134 bo->mem.num_pages, placement->fpfn,
1139 for (i = 0; i < placement->num_placement; i++) {
1140 if (!capable(CAP_SYS_ADMIN)) {
1141 if (placement->placement[i] & TTM_PL_FLAG_NO_EVICT) {
1142 printk(KERN_ERR TTM_PFX "Need to be root to "
1143 "modify NO_EVICT status.\n");
1148 for (i = 0; i < placement->num_busy_placement; i++) {
1149 if (!capable(CAP_SYS_ADMIN)) {
1150 if (placement->busy_placement[i] & TTM_PL_FLAG_NO_EVICT) {
1151 printk(KERN_ERR TTM_PFX "Need to be root to "
1152 "modify NO_EVICT status.\n");
1160 int ttm_bo_init(struct ttm_bo_device *bdev,
1161 struct ttm_buffer_object *bo,
1163 enum ttm_bo_type type,
1164 struct ttm_placement *placement,
1165 uint32_t page_alignment,
1166 unsigned long buffer_start,
1168 struct file *persistant_swap_storage,
1170 void (*destroy) (struct ttm_buffer_object *))
1173 unsigned long num_pages;
1175 size += buffer_start & ~PAGE_MASK;
1176 num_pages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
1177 if (num_pages == 0) {
1178 printk(KERN_ERR TTM_PFX "Illegal buffer object size.\n");
1181 bo->destroy = destroy;
1183 spin_lock_init(&bo->lock);
1184 kref_init(&bo->kref);
1185 kref_init(&bo->list_kref);
1186 atomic_set(&bo->cpu_writers, 0);
1187 atomic_set(&bo->reserved, 1);
1188 init_waitqueue_head(&bo->event_queue);
1189 INIT_LIST_HEAD(&bo->lru);
1190 INIT_LIST_HEAD(&bo->ddestroy);
1191 INIT_LIST_HEAD(&bo->swap);
1193 bo->glob = bdev->glob;
1195 bo->num_pages = num_pages;
1196 bo->mem.size = num_pages << PAGE_SHIFT;
1197 bo->mem.mem_type = TTM_PL_SYSTEM;
1198 bo->mem.num_pages = bo->num_pages;
1199 bo->mem.mm_node = NULL;
1200 bo->mem.page_alignment = page_alignment;
1201 bo->mem.bus.io_reserved = false;
1202 bo->buffer_start = buffer_start & PAGE_MASK;
1204 bo->mem.placement = (TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED);
1205 bo->seq_valid = false;
1206 bo->persistant_swap_storage = persistant_swap_storage;
1207 bo->acc_size = acc_size;
1208 atomic_inc(&bo->glob->bo_count);
1210 ret = ttm_bo_check_placement(bo, placement);
1211 if (unlikely(ret != 0))
1215 * For ttm_bo_type_device buffers, allocate
1216 * address space from the device.
1218 if (bo->type == ttm_bo_type_device) {
1219 ret = ttm_bo_setup_vm(bo);
1224 ret = ttm_bo_validate(bo, placement, interruptible, false, false);
1228 ttm_bo_unreserve(bo);
1232 ttm_bo_unreserve(bo);
1237 EXPORT_SYMBOL(ttm_bo_init);
1239 static inline size_t ttm_bo_size(struct ttm_bo_global *glob,
1240 unsigned long num_pages)
1242 size_t page_array_size = (num_pages * sizeof(void *) + PAGE_SIZE - 1) &
1245 return glob->ttm_bo_size + 2 * page_array_size;
1248 int ttm_bo_create(struct ttm_bo_device *bdev,
1250 enum ttm_bo_type type,
1251 struct ttm_placement *placement,
1252 uint32_t page_alignment,
1253 unsigned long buffer_start,
1255 struct file *persistant_swap_storage,
1256 struct ttm_buffer_object **p_bo)
1258 struct ttm_buffer_object *bo;
1259 struct ttm_mem_global *mem_glob = bdev->glob->mem_glob;
1263 ttm_bo_size(bdev->glob, (size + PAGE_SIZE - 1) >> PAGE_SHIFT);
1264 ret = ttm_mem_global_alloc(mem_glob, acc_size, false, false);
1265 if (unlikely(ret != 0))
1268 bo = kzalloc(sizeof(*bo), GFP_KERNEL);
1270 if (unlikely(bo == NULL)) {
1271 ttm_mem_global_free(mem_glob, acc_size);
1275 ret = ttm_bo_init(bdev, bo, size, type, placement, page_alignment,
1276 buffer_start, interruptible,
1277 persistant_swap_storage, acc_size, NULL);
1278 if (likely(ret == 0))
1284 static int ttm_bo_force_list_clean(struct ttm_bo_device *bdev,
1285 unsigned mem_type, bool allow_errors)
1287 struct ttm_mem_type_manager *man = &bdev->man[mem_type];
1288 struct ttm_bo_global *glob = bdev->glob;
1292 * Can't use standard list traversal since we're unlocking.
1295 spin_lock(&glob->lru_lock);
1296 while (!list_empty(&man->lru)) {
1297 spin_unlock(&glob->lru_lock);
1298 ret = ttm_mem_evict_first(bdev, mem_type, false, false, false);
1303 printk(KERN_ERR TTM_PFX
1304 "Cleanup eviction failed\n");
1307 spin_lock(&glob->lru_lock);
1309 spin_unlock(&glob->lru_lock);
1313 int ttm_bo_clean_mm(struct ttm_bo_device *bdev, unsigned mem_type)
1315 struct ttm_mem_type_manager *man;
1318 if (mem_type >= TTM_NUM_MEM_TYPES) {
1319 printk(KERN_ERR TTM_PFX "Illegal memory type %d\n", mem_type);
1322 man = &bdev->man[mem_type];
1324 if (!man->has_type) {
1325 printk(KERN_ERR TTM_PFX "Trying to take down uninitialized "
1326 "memory manager type %u\n", mem_type);
1330 man->use_type = false;
1331 man->has_type = false;
1335 ttm_bo_force_list_clean(bdev, mem_type, false);
1337 ret = (*man->func->takedown)(man);
1342 EXPORT_SYMBOL(ttm_bo_clean_mm);
1344 int ttm_bo_evict_mm(struct ttm_bo_device *bdev, unsigned mem_type)
1346 struct ttm_mem_type_manager *man = &bdev->man[mem_type];
1348 if (mem_type == 0 || mem_type >= TTM_NUM_MEM_TYPES) {
1349 printk(KERN_ERR TTM_PFX
1350 "Illegal memory manager memory type %u.\n",
1355 if (!man->has_type) {
1356 printk(KERN_ERR TTM_PFX
1357 "Memory type %u has not been initialized.\n",
1362 return ttm_bo_force_list_clean(bdev, mem_type, true);
1364 EXPORT_SYMBOL(ttm_bo_evict_mm);
1366 int ttm_bo_init_mm(struct ttm_bo_device *bdev, unsigned type,
1367 unsigned long p_size)
1370 struct ttm_mem_type_manager *man;
1372 if (type >= TTM_NUM_MEM_TYPES) {
1373 printk(KERN_ERR TTM_PFX "Illegal memory type %d\n", type);
1377 man = &bdev->man[type];
1378 if (man->has_type) {
1379 printk(KERN_ERR TTM_PFX
1380 "Memory manager already initialized for type %d\n",
1385 ret = bdev->driver->init_mem_type(bdev, type, man);
1391 if (type != TTM_PL_SYSTEM) {
1393 printk(KERN_ERR TTM_PFX
1394 "Zero size memory manager type %d\n",
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 if (!cancel_delayed_work(&bdev->wq))
1509 flush_scheduled_work();
1511 while (ttm_bo_delayed_delete(bdev, true))
1514 spin_lock(&glob->lru_lock);
1515 if (list_empty(&bdev->ddestroy))
1516 TTM_DEBUG("Delayed destroy list was clean\n");
1518 if (list_empty(&bdev->man[0].lru))
1519 TTM_DEBUG("Swap list was clean\n");
1520 spin_unlock(&glob->lru_lock);
1522 BUG_ON(!drm_mm_clean(&bdev->addr_space_mm));
1523 write_lock(&bdev->vm_lock);
1524 drm_mm_takedown(&bdev->addr_space_mm);
1525 write_unlock(&bdev->vm_lock);
1529 EXPORT_SYMBOL(ttm_bo_device_release);
1531 int ttm_bo_device_init(struct ttm_bo_device *bdev,
1532 struct ttm_bo_global *glob,
1533 struct ttm_bo_driver *driver,
1534 uint64_t file_page_offset,
1539 rwlock_init(&bdev->vm_lock);
1540 bdev->driver = driver;
1542 memset(bdev->man, 0, sizeof(bdev->man));
1545 * Initialize the system memory buffer type.
1546 * Other types need to be driver / IOCTL initialized.
1548 ret = ttm_bo_init_mm(bdev, TTM_PL_SYSTEM, 0);
1549 if (unlikely(ret != 0))
1552 bdev->addr_space_rb = RB_ROOT;
1553 ret = drm_mm_init(&bdev->addr_space_mm, file_page_offset, 0x10000000);
1554 if (unlikely(ret != 0))
1555 goto out_no_addr_mm;
1557 INIT_DELAYED_WORK(&bdev->wq, ttm_bo_delayed_workqueue);
1558 bdev->nice_mode = true;
1559 INIT_LIST_HEAD(&bdev->ddestroy);
1560 bdev->dev_mapping = NULL;
1562 bdev->need_dma32 = need_dma32;
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(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(bdev, &bo->mem);
1608 EXPORT_SYMBOL(ttm_bo_unmap_virtual);
1610 static void ttm_bo_vm_insert_rb(struct ttm_buffer_object *bo)
1612 struct ttm_bo_device *bdev = bo->bdev;
1613 struct rb_node **cur = &bdev->addr_space_rb.rb_node;
1614 struct rb_node *parent = NULL;
1615 struct ttm_buffer_object *cur_bo;
1616 unsigned long offset = bo->vm_node->start;
1617 unsigned long cur_offset;
1621 cur_bo = rb_entry(parent, struct ttm_buffer_object, vm_rb);
1622 cur_offset = cur_bo->vm_node->start;
1623 if (offset < cur_offset)
1624 cur = &parent->rb_left;
1625 else if (offset > cur_offset)
1626 cur = &parent->rb_right;
1631 rb_link_node(&bo->vm_rb, parent, cur);
1632 rb_insert_color(&bo->vm_rb, &bdev->addr_space_rb);
1638 * @bo: the buffer to allocate address space for
1640 * Allocate address space in the drm device so that applications
1641 * can mmap the buffer and access the contents. This only
1642 * applies to ttm_bo_type_device objects as others are not
1643 * placed in the drm device address space.
1646 static int ttm_bo_setup_vm(struct ttm_buffer_object *bo)
1648 struct ttm_bo_device *bdev = bo->bdev;
1652 ret = drm_mm_pre_get(&bdev->addr_space_mm);
1653 if (unlikely(ret != 0))
1656 write_lock(&bdev->vm_lock);
1657 bo->vm_node = drm_mm_search_free(&bdev->addr_space_mm,
1658 bo->mem.num_pages, 0, 0);
1660 if (unlikely(bo->vm_node == NULL)) {
1665 bo->vm_node = drm_mm_get_block_atomic(bo->vm_node,
1666 bo->mem.num_pages, 0);
1668 if (unlikely(bo->vm_node == NULL)) {
1669 write_unlock(&bdev->vm_lock);
1673 ttm_bo_vm_insert_rb(bo);
1674 write_unlock(&bdev->vm_lock);
1675 bo->addr_space_offset = ((uint64_t) bo->vm_node->start) << PAGE_SHIFT;
1679 write_unlock(&bdev->vm_lock);
1683 int ttm_bo_wait(struct ttm_buffer_object *bo,
1684 bool lazy, bool interruptible, bool no_wait)
1686 struct ttm_bo_driver *driver = bo->bdev->driver;
1691 if (likely(bo->sync_obj == NULL))
1694 while (bo->sync_obj) {
1696 if (driver->sync_obj_signaled(bo->sync_obj, bo->sync_obj_arg)) {
1697 void *tmp_obj = bo->sync_obj;
1698 bo->sync_obj = NULL;
1699 clear_bit(TTM_BO_PRIV_FLAG_MOVING, &bo->priv_flags);
1700 spin_unlock(&bo->lock);
1701 driver->sync_obj_unref(&tmp_obj);
1702 spin_lock(&bo->lock);
1709 sync_obj = driver->sync_obj_ref(bo->sync_obj);
1710 sync_obj_arg = bo->sync_obj_arg;
1711 spin_unlock(&bo->lock);
1712 ret = driver->sync_obj_wait(sync_obj, sync_obj_arg,
1713 lazy, interruptible);
1714 if (unlikely(ret != 0)) {
1715 driver->sync_obj_unref(&sync_obj);
1716 spin_lock(&bo->lock);
1719 spin_lock(&bo->lock);
1720 if (likely(bo->sync_obj == sync_obj &&
1721 bo->sync_obj_arg == sync_obj_arg)) {
1722 void *tmp_obj = bo->sync_obj;
1723 bo->sync_obj = NULL;
1724 clear_bit(TTM_BO_PRIV_FLAG_MOVING,
1726 spin_unlock(&bo->lock);
1727 driver->sync_obj_unref(&sync_obj);
1728 driver->sync_obj_unref(&tmp_obj);
1729 spin_lock(&bo->lock);
1731 spin_unlock(&bo->lock);
1732 driver->sync_obj_unref(&sync_obj);
1733 spin_lock(&bo->lock);
1738 EXPORT_SYMBOL(ttm_bo_wait);
1740 int ttm_bo_synccpu_write_grab(struct ttm_buffer_object *bo, bool no_wait)
1745 * Using ttm_bo_reserve makes sure the lru lists are updated.
1748 ret = ttm_bo_reserve(bo, true, no_wait, false, 0);
1749 if (unlikely(ret != 0))
1751 spin_lock(&bo->lock);
1752 ret = ttm_bo_wait(bo, false, true, no_wait);
1753 spin_unlock(&bo->lock);
1754 if (likely(ret == 0))
1755 atomic_inc(&bo->cpu_writers);
1756 ttm_bo_unreserve(bo);
1759 EXPORT_SYMBOL(ttm_bo_synccpu_write_grab);
1761 void ttm_bo_synccpu_write_release(struct ttm_buffer_object *bo)
1763 if (atomic_dec_and_test(&bo->cpu_writers))
1764 wake_up_all(&bo->event_queue);
1766 EXPORT_SYMBOL(ttm_bo_synccpu_write_release);
1769 * A buffer object shrink method that tries to swap out the first
1770 * buffer object on the bo_global::swap_lru list.
1773 static int ttm_bo_swapout(struct ttm_mem_shrink *shrink)
1775 struct ttm_bo_global *glob =
1776 container_of(shrink, struct ttm_bo_global, shrink);
1777 struct ttm_buffer_object *bo;
1780 uint32_t swap_placement = (TTM_PL_FLAG_CACHED | TTM_PL_FLAG_SYSTEM);
1782 spin_lock(&glob->lru_lock);
1783 while (ret == -EBUSY) {
1784 if (unlikely(list_empty(&glob->swap_lru))) {
1785 spin_unlock(&glob->lru_lock);
1789 bo = list_first_entry(&glob->swap_lru,
1790 struct ttm_buffer_object, swap);
1791 kref_get(&bo->list_kref);
1793 if (!list_empty(&bo->ddestroy)) {
1794 spin_unlock(&glob->lru_lock);
1795 (void) ttm_bo_cleanup_refs(bo, false, false, false);
1796 kref_put(&bo->list_kref, ttm_bo_release_list);
1801 * Reserve buffer. Since we unlock while sleeping, we need
1802 * to re-check that nobody removed us from the swap-list while
1806 ret = ttm_bo_reserve_locked(bo, false, true, false, 0);
1807 if (unlikely(ret == -EBUSY)) {
1808 spin_unlock(&glob->lru_lock);
1809 ttm_bo_wait_unreserved(bo, false);
1810 kref_put(&bo->list_kref, ttm_bo_release_list);
1811 spin_lock(&glob->lru_lock);
1816 put_count = ttm_bo_del_from_lru(bo);
1817 spin_unlock(&glob->lru_lock);
1820 kref_put(&bo->list_kref, ttm_bo_ref_bug);
1823 * Wait for GPU, then move to system cached.
1826 spin_lock(&bo->lock);
1827 ret = ttm_bo_wait(bo, false, false, false);
1828 spin_unlock(&bo->lock);
1830 if (unlikely(ret != 0))
1833 if ((bo->mem.placement & swap_placement) != swap_placement) {
1834 struct ttm_mem_reg evict_mem;
1836 evict_mem = bo->mem;
1837 evict_mem.mm_node = NULL;
1838 evict_mem.placement = TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED;
1839 evict_mem.mem_type = TTM_PL_SYSTEM;
1841 ret = ttm_bo_handle_move_mem(bo, &evict_mem, true,
1842 false, false, false);
1843 if (unlikely(ret != 0))
1847 ttm_bo_unmap_virtual(bo);
1850 * Swap out. Buffer will be swapped in again as soon as
1851 * anyone tries to access a ttm page.
1854 if (bo->bdev->driver->swap_notify)
1855 bo->bdev->driver->swap_notify(bo);
1857 ret = ttm_tt_swapout(bo->ttm, bo->persistant_swap_storage);
1862 * Unreserve without putting on LRU to avoid swapping out an
1863 * already swapped buffer.
1866 atomic_set(&bo->reserved, 0);
1867 wake_up_all(&bo->event_queue);
1868 kref_put(&bo->list_kref, ttm_bo_release_list);
1872 void ttm_bo_swapout_all(struct ttm_bo_device *bdev)
1874 while (ttm_bo_swapout(&bdev->glob->shrink) == 0)
1877 EXPORT_SYMBOL(ttm_bo_swapout_all);