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 <asm/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 static 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);
195 * Call with the lru_lock held.
198 static int ttm_bo_del_from_lru(struct ttm_buffer_object *bo)
202 if (!list_empty(&bo->swap)) {
203 list_del_init(&bo->swap);
206 if (!list_empty(&bo->lru)) {
207 list_del_init(&bo->lru);
212 * TODO: Add a driver hook to delete from
213 * driver-specific LRU's here.
219 int ttm_bo_reserve_locked(struct ttm_buffer_object *bo,
221 bool no_wait, bool use_sequence, uint32_t sequence)
223 struct ttm_bo_global *glob = bo->glob;
226 while (unlikely(atomic_cmpxchg(&bo->reserved, 0, 1) != 0)) {
228 * Deadlock avoidance for multi-bo reserving.
230 if (use_sequence && bo->seq_valid &&
231 (sequence - bo->val_seq < (1 << 31))) {
238 spin_unlock(&glob->lru_lock);
239 ret = ttm_bo_wait_unreserved(bo, interruptible);
240 spin_lock(&glob->lru_lock);
248 * Wake up waiters that may need to recheck for deadlock,
249 * if we decreased the sequence number.
251 if (unlikely((bo->val_seq - sequence < (1 << 31))
253 wake_up_all(&bo->event_queue);
255 bo->val_seq = sequence;
256 bo->seq_valid = true;
258 bo->seq_valid = false;
263 EXPORT_SYMBOL(ttm_bo_reserve);
265 static void ttm_bo_ref_bug(struct kref *list_kref)
270 int ttm_bo_reserve(struct ttm_buffer_object *bo,
272 bool no_wait, bool use_sequence, uint32_t sequence)
274 struct ttm_bo_global *glob = bo->glob;
278 spin_lock(&glob->lru_lock);
279 ret = ttm_bo_reserve_locked(bo, interruptible, no_wait, use_sequence,
281 if (likely(ret == 0))
282 put_count = ttm_bo_del_from_lru(bo);
283 spin_unlock(&glob->lru_lock);
286 kref_put(&bo->list_kref, ttm_bo_ref_bug);
291 void ttm_bo_unreserve(struct ttm_buffer_object *bo)
293 struct ttm_bo_global *glob = bo->glob;
295 spin_lock(&glob->lru_lock);
296 ttm_bo_add_to_lru(bo);
297 atomic_set(&bo->reserved, 0);
298 wake_up_all(&bo->event_queue);
299 spin_unlock(&glob->lru_lock);
301 EXPORT_SYMBOL(ttm_bo_unreserve);
304 * Call bo->mutex locked.
306 static int ttm_bo_add_ttm(struct ttm_buffer_object *bo, bool zero_alloc)
308 struct ttm_bo_device *bdev = bo->bdev;
309 struct ttm_bo_global *glob = bo->glob;
311 uint32_t page_flags = 0;
313 TTM_ASSERT_LOCKED(&bo->mutex);
316 if (bdev->need_dma32)
317 page_flags |= TTM_PAGE_FLAG_DMA32;
320 case ttm_bo_type_device:
322 page_flags |= TTM_PAGE_FLAG_ZERO_ALLOC;
323 case ttm_bo_type_kernel:
324 bo->ttm = ttm_tt_create(bdev, bo->num_pages << PAGE_SHIFT,
325 page_flags, glob->dummy_read_page);
326 if (unlikely(bo->ttm == NULL))
329 case ttm_bo_type_user:
330 bo->ttm = ttm_tt_create(bdev, bo->num_pages << PAGE_SHIFT,
331 page_flags | TTM_PAGE_FLAG_USER,
332 glob->dummy_read_page);
333 if (unlikely(bo->ttm == NULL)) {
338 ret = ttm_tt_set_user(bo->ttm, current,
339 bo->buffer_start, bo->num_pages);
340 if (unlikely(ret != 0))
341 ttm_tt_destroy(bo->ttm);
344 printk(KERN_ERR TTM_PFX "Illegal buffer object type\n");
352 static int ttm_bo_handle_move_mem(struct ttm_buffer_object *bo,
353 struct ttm_mem_reg *mem,
354 bool evict, bool interruptible,
355 bool no_wait_reserve, bool no_wait_gpu)
357 struct ttm_bo_device *bdev = bo->bdev;
358 bool old_is_pci = ttm_mem_reg_is_pci(bdev, &bo->mem);
359 bool new_is_pci = ttm_mem_reg_is_pci(bdev, mem);
360 struct ttm_mem_type_manager *old_man = &bdev->man[bo->mem.mem_type];
361 struct ttm_mem_type_manager *new_man = &bdev->man[mem->mem_type];
364 if (old_is_pci || new_is_pci ||
365 ((mem->placement & bo->mem.placement & TTM_PL_MASK_CACHING) == 0))
366 ttm_bo_unmap_virtual(bo);
369 * Create and bind a ttm if required.
372 if (!(new_man->flags & TTM_MEMTYPE_FLAG_FIXED) && (bo->ttm == NULL)) {
373 ret = ttm_bo_add_ttm(bo, false);
377 ret = ttm_tt_set_placement_caching(bo->ttm, mem->placement);
381 if (mem->mem_type != TTM_PL_SYSTEM) {
382 ret = ttm_tt_bind(bo->ttm, mem);
387 if (bo->mem.mem_type == TTM_PL_SYSTEM) {
395 if (bdev->driver->move_notify)
396 bdev->driver->move_notify(bo, mem);
398 if (!(old_man->flags & TTM_MEMTYPE_FLAG_FIXED) &&
399 !(new_man->flags & TTM_MEMTYPE_FLAG_FIXED))
400 ret = ttm_bo_move_ttm(bo, evict, no_wait_reserve, no_wait_gpu, mem);
401 else if (bdev->driver->move)
402 ret = bdev->driver->move(bo, evict, interruptible,
403 no_wait_reserve, no_wait_gpu, mem);
405 ret = ttm_bo_move_memcpy(bo, evict, no_wait_reserve, no_wait_gpu, mem);
412 ret = bdev->driver->invalidate_caches(bdev, bo->mem.placement);
414 printk(KERN_ERR TTM_PFX "Can not flush read caches\n");
418 if (bo->mem.mm_node) {
419 spin_lock(&bo->lock);
420 bo->offset = (bo->mem.start << PAGE_SHIFT) +
421 bdev->man[bo->mem.mem_type].gpu_offset;
422 bo->cur_placement = bo->mem.placement;
423 spin_unlock(&bo->lock);
430 new_man = &bdev->man[bo->mem.mem_type];
431 if ((new_man->flags & TTM_MEMTYPE_FLAG_FIXED) && bo->ttm) {
432 ttm_tt_unbind(bo->ttm);
433 ttm_tt_destroy(bo->ttm);
442 * Will release GPU memory type usage on destruction.
443 * This is the place to put in driver specific hooks to release
444 * driver private resources.
445 * Will release the bo::reserved lock.
448 static void ttm_bo_cleanup_memtype_use(struct ttm_buffer_object *bo)
451 ttm_tt_unbind(bo->ttm);
452 ttm_tt_destroy(bo->ttm);
456 ttm_bo_mem_put(bo, &bo->mem);
458 atomic_set(&bo->reserved, 0);
461 * Make processes trying to reserve really pick it up.
463 smp_mb__after_atomic_dec();
464 wake_up_all(&bo->event_queue);
467 static void ttm_bo_cleanup_refs_or_queue(struct ttm_buffer_object *bo)
469 struct ttm_bo_device *bdev = bo->bdev;
470 struct ttm_bo_global *glob = bo->glob;
471 struct ttm_bo_driver *driver;
472 void *sync_obj = NULL;
477 spin_lock(&bo->lock);
478 (void) ttm_bo_wait(bo, false, false, true);
481 spin_lock(&glob->lru_lock);
484 * Lock inversion between bo::reserve and bo::lock here,
485 * but that's OK, since we're only trylocking.
488 ret = ttm_bo_reserve_locked(bo, false, true, false, 0);
490 if (unlikely(ret == -EBUSY))
493 spin_unlock(&bo->lock);
494 put_count = ttm_bo_del_from_lru(bo);
496 spin_unlock(&glob->lru_lock);
497 ttm_bo_cleanup_memtype_use(bo);
500 kref_put(&bo->list_kref, ttm_bo_ref_bug);
504 spin_lock(&glob->lru_lock);
507 driver = bdev->driver;
509 sync_obj = driver->sync_obj_ref(bo->sync_obj);
510 sync_obj_arg = bo->sync_obj_arg;
512 kref_get(&bo->list_kref);
513 list_add_tail(&bo->ddestroy, &bdev->ddestroy);
514 spin_unlock(&glob->lru_lock);
515 spin_unlock(&bo->lock);
518 driver->sync_obj_flush(sync_obj, sync_obj_arg);
519 driver->sync_obj_unref(&sync_obj);
521 schedule_delayed_work(&bdev->wq,
522 ((HZ / 100) < 1) ? 1 : HZ / 100);
526 * function ttm_bo_cleanup_refs
527 * If bo idle, remove from delayed- and lru lists, and unref.
528 * If not idle, do nothing.
530 * @interruptible Any sleeps should occur interruptibly.
531 * @no_wait_reserve Never wait for reserve. Return -EBUSY instead.
532 * @no_wait_gpu Never wait for gpu. Return -EBUSY instead.
535 static int ttm_bo_cleanup_refs(struct ttm_buffer_object *bo,
537 bool no_wait_reserve,
540 struct ttm_bo_global *glob = bo->glob;
545 spin_lock(&bo->lock);
546 ret = ttm_bo_wait(bo, false, interruptible, no_wait_gpu);
547 spin_unlock(&bo->lock);
549 if (unlikely(ret != 0))
552 spin_lock(&glob->lru_lock);
553 ret = ttm_bo_reserve_locked(bo, interruptible,
554 no_wait_reserve, false, 0);
556 if (unlikely(ret != 0) || list_empty(&bo->ddestroy)) {
557 spin_unlock(&glob->lru_lock);
562 * We can re-check for sync object without taking
563 * the bo::lock since setting the sync object requires
564 * also bo::reserved. A busy object at this point may
565 * be caused by another thread recently starting an accelerated
569 if (unlikely(bo->sync_obj)) {
570 atomic_set(&bo->reserved, 0);
571 wake_up_all(&bo->event_queue);
572 spin_unlock(&glob->lru_lock);
576 put_count = ttm_bo_del_from_lru(bo);
577 list_del_init(&bo->ddestroy);
580 spin_unlock(&glob->lru_lock);
581 ttm_bo_cleanup_memtype_use(bo);
584 kref_put(&bo->list_kref, ttm_bo_ref_bug);
590 * Traverse the delayed list, and call ttm_bo_cleanup_refs on all
591 * encountered buffers.
594 static int ttm_bo_delayed_delete(struct ttm_bo_device *bdev, bool remove_all)
596 struct ttm_bo_global *glob = bdev->glob;
597 struct ttm_buffer_object *entry = NULL;
600 spin_lock(&glob->lru_lock);
601 if (list_empty(&bdev->ddestroy))
604 entry = list_first_entry(&bdev->ddestroy,
605 struct ttm_buffer_object, ddestroy);
606 kref_get(&entry->list_kref);
609 struct ttm_buffer_object *nentry = NULL;
611 if (entry->ddestroy.next != &bdev->ddestroy) {
612 nentry = list_first_entry(&entry->ddestroy,
613 struct ttm_buffer_object, ddestroy);
614 kref_get(&nentry->list_kref);
617 spin_unlock(&glob->lru_lock);
618 ret = ttm_bo_cleanup_refs(entry, false, !remove_all,
620 kref_put(&entry->list_kref, ttm_bo_release_list);
626 spin_lock(&glob->lru_lock);
627 if (list_empty(&entry->ddestroy))
632 spin_unlock(&glob->lru_lock);
635 kref_put(&entry->list_kref, ttm_bo_release_list);
639 static void ttm_bo_delayed_workqueue(struct work_struct *work)
641 struct ttm_bo_device *bdev =
642 container_of(work, struct ttm_bo_device, wq.work);
644 if (ttm_bo_delayed_delete(bdev, false)) {
645 schedule_delayed_work(&bdev->wq,
646 ((HZ / 100) < 1) ? 1 : HZ / 100);
650 static void ttm_bo_release(struct kref *kref)
652 struct ttm_buffer_object *bo =
653 container_of(kref, struct ttm_buffer_object, kref);
654 struct ttm_bo_device *bdev = bo->bdev;
656 if (likely(bo->vm_node != NULL)) {
657 rb_erase(&bo->vm_rb, &bdev->addr_space_rb);
658 drm_mm_put_block(bo->vm_node);
661 write_unlock(&bdev->vm_lock);
662 ttm_bo_cleanup_refs_or_queue(bo);
663 kref_put(&bo->list_kref, ttm_bo_release_list);
664 write_lock(&bdev->vm_lock);
667 void ttm_bo_unref(struct ttm_buffer_object **p_bo)
669 struct ttm_buffer_object *bo = *p_bo;
670 struct ttm_bo_device *bdev = bo->bdev;
673 write_lock(&bdev->vm_lock);
674 kref_put(&bo->kref, ttm_bo_release);
675 write_unlock(&bdev->vm_lock);
677 EXPORT_SYMBOL(ttm_bo_unref);
679 int ttm_bo_lock_delayed_workqueue(struct ttm_bo_device *bdev)
681 return cancel_delayed_work_sync(&bdev->wq);
683 EXPORT_SYMBOL(ttm_bo_lock_delayed_workqueue);
685 void ttm_bo_unlock_delayed_workqueue(struct ttm_bo_device *bdev, int resched)
688 schedule_delayed_work(&bdev->wq,
689 ((HZ / 100) < 1) ? 1 : HZ / 100);
691 EXPORT_SYMBOL(ttm_bo_unlock_delayed_workqueue);
693 static int ttm_bo_evict(struct ttm_buffer_object *bo, bool interruptible,
694 bool no_wait_reserve, bool no_wait_gpu)
696 struct ttm_bo_device *bdev = bo->bdev;
697 struct ttm_mem_reg evict_mem;
698 struct ttm_placement placement;
701 spin_lock(&bo->lock);
702 ret = ttm_bo_wait(bo, false, interruptible, no_wait_gpu);
703 spin_unlock(&bo->lock);
705 if (unlikely(ret != 0)) {
706 if (ret != -ERESTARTSYS) {
707 printk(KERN_ERR TTM_PFX
708 "Failed to expire sync object before "
709 "buffer eviction.\n");
714 BUG_ON(!atomic_read(&bo->reserved));
717 evict_mem.mm_node = NULL;
718 evict_mem.bus.io_reserved = false;
722 placement.num_placement = 0;
723 placement.num_busy_placement = 0;
724 bdev->driver->evict_flags(bo, &placement);
725 ret = ttm_bo_mem_space(bo, &placement, &evict_mem, interruptible,
726 no_wait_reserve, no_wait_gpu);
728 if (ret != -ERESTARTSYS) {
729 printk(KERN_ERR TTM_PFX
730 "Failed to find memory space for "
731 "buffer 0x%p eviction.\n", bo);
732 ttm_bo_mem_space_debug(bo, &placement);
737 ret = ttm_bo_handle_move_mem(bo, &evict_mem, true, interruptible,
738 no_wait_reserve, no_wait_gpu);
740 if (ret != -ERESTARTSYS)
741 printk(KERN_ERR TTM_PFX "Buffer eviction failed\n");
742 ttm_bo_mem_put(bo, &evict_mem);
750 static int ttm_mem_evict_first(struct ttm_bo_device *bdev,
752 bool interruptible, bool no_wait_reserve,
755 struct ttm_bo_global *glob = bdev->glob;
756 struct ttm_mem_type_manager *man = &bdev->man[mem_type];
757 struct ttm_buffer_object *bo;
758 int ret, put_count = 0;
761 spin_lock(&glob->lru_lock);
762 if (list_empty(&man->lru)) {
763 spin_unlock(&glob->lru_lock);
767 bo = list_first_entry(&man->lru, struct ttm_buffer_object, lru);
768 kref_get(&bo->list_kref);
770 if (!list_empty(&bo->ddestroy)) {
771 spin_unlock(&glob->lru_lock);
772 ret = ttm_bo_cleanup_refs(bo, interruptible,
773 no_wait_reserve, no_wait_gpu);
774 kref_put(&bo->list_kref, ttm_bo_release_list);
776 if (likely(ret == 0 || ret == -ERESTARTSYS))
782 ret = ttm_bo_reserve_locked(bo, false, no_wait_reserve, false, 0);
784 if (unlikely(ret == -EBUSY)) {
785 spin_unlock(&glob->lru_lock);
786 if (likely(!no_wait_gpu))
787 ret = ttm_bo_wait_unreserved(bo, interruptible);
789 kref_put(&bo->list_kref, ttm_bo_release_list);
792 * We *need* to retry after releasing the lru lock.
795 if (unlikely(ret != 0))
800 put_count = ttm_bo_del_from_lru(bo);
801 spin_unlock(&glob->lru_lock);
806 kref_put(&bo->list_kref, ttm_bo_ref_bug);
808 ret = ttm_bo_evict(bo, interruptible, no_wait_reserve, no_wait_gpu);
809 ttm_bo_unreserve(bo);
811 kref_put(&bo->list_kref, ttm_bo_release_list);
815 void ttm_bo_mem_put(struct ttm_buffer_object *bo, struct ttm_mem_reg *mem)
817 struct ttm_mem_type_manager *man = &bo->bdev->man[mem->mem_type];
820 (*man->func->put_node)(man, mem);
822 EXPORT_SYMBOL(ttm_bo_mem_put);
825 * Repeatedly evict memory from the LRU for @mem_type until we create enough
826 * space, or we've evicted everything and there isn't enough space.
828 static int ttm_bo_mem_force_space(struct ttm_buffer_object *bo,
830 struct ttm_placement *placement,
831 struct ttm_mem_reg *mem,
833 bool no_wait_reserve,
836 struct ttm_bo_device *bdev = bo->bdev;
837 struct ttm_mem_type_manager *man = &bdev->man[mem_type];
841 ret = (*man->func->get_node)(man, bo, placement, mem);
842 if (unlikely(ret != 0))
846 ret = ttm_mem_evict_first(bdev, mem_type, interruptible,
847 no_wait_reserve, no_wait_gpu);
848 if (unlikely(ret != 0))
851 if (mem->mm_node == NULL)
853 mem->mem_type = mem_type;
857 static uint32_t ttm_bo_select_caching(struct ttm_mem_type_manager *man,
858 uint32_t cur_placement,
859 uint32_t proposed_placement)
861 uint32_t caching = proposed_placement & TTM_PL_MASK_CACHING;
862 uint32_t result = proposed_placement & ~TTM_PL_MASK_CACHING;
865 * Keep current caching if possible.
868 if ((cur_placement & caching) != 0)
869 result |= (cur_placement & caching);
870 else if ((man->default_caching & caching) != 0)
871 result |= man->default_caching;
872 else if ((TTM_PL_FLAG_CACHED & caching) != 0)
873 result |= TTM_PL_FLAG_CACHED;
874 else if ((TTM_PL_FLAG_WC & caching) != 0)
875 result |= TTM_PL_FLAG_WC;
876 else if ((TTM_PL_FLAG_UNCACHED & caching) != 0)
877 result |= TTM_PL_FLAG_UNCACHED;
882 static bool ttm_bo_mt_compatible(struct ttm_mem_type_manager *man,
885 uint32_t proposed_placement,
886 uint32_t *masked_placement)
888 uint32_t cur_flags = ttm_bo_type_flags(mem_type);
890 if ((man->flags & TTM_MEMTYPE_FLAG_FIXED) && disallow_fixed)
893 if ((cur_flags & proposed_placement & TTM_PL_MASK_MEM) == 0)
896 if ((proposed_placement & man->available_caching) == 0)
899 cur_flags |= (proposed_placement & man->available_caching);
901 *masked_placement = cur_flags;
906 * Creates space for memory region @mem according to its type.
908 * This function first searches for free space in compatible memory types in
909 * the priority order defined by the driver. If free space isn't found, then
910 * ttm_bo_mem_force_space is attempted in priority order to evict and find
913 int ttm_bo_mem_space(struct ttm_buffer_object *bo,
914 struct ttm_placement *placement,
915 struct ttm_mem_reg *mem,
916 bool interruptible, bool no_wait_reserve,
919 struct ttm_bo_device *bdev = bo->bdev;
920 struct ttm_mem_type_manager *man;
921 uint32_t mem_type = TTM_PL_SYSTEM;
922 uint32_t cur_flags = 0;
923 bool type_found = false;
924 bool type_ok = false;
925 bool has_erestartsys = false;
929 for (i = 0; i < placement->num_placement; ++i) {
930 ret = ttm_mem_type_from_flags(placement->placement[i],
934 man = &bdev->man[mem_type];
936 type_ok = ttm_bo_mt_compatible(man,
937 bo->type == ttm_bo_type_user,
939 placement->placement[i],
945 cur_flags = ttm_bo_select_caching(man, bo->mem.placement,
948 * Use the access and other non-mapping-related flag bits from
949 * the memory placement flags to the current flags
951 ttm_flag_masked(&cur_flags, placement->placement[i],
952 ~TTM_PL_MASK_MEMTYPE);
954 if (mem_type == TTM_PL_SYSTEM)
957 if (man->has_type && man->use_type) {
959 ret = (*man->func->get_node)(man, bo, placement, mem);
967 if ((type_ok && (mem_type == TTM_PL_SYSTEM)) || mem->mm_node) {
968 mem->mem_type = mem_type;
969 mem->placement = cur_flags;
976 for (i = 0; i < placement->num_busy_placement; ++i) {
977 ret = ttm_mem_type_from_flags(placement->busy_placement[i],
981 man = &bdev->man[mem_type];
984 if (!ttm_bo_mt_compatible(man,
985 bo->type == ttm_bo_type_user,
987 placement->busy_placement[i],
991 cur_flags = ttm_bo_select_caching(man, bo->mem.placement,
994 * Use the access and other non-mapping-related flag bits from
995 * the memory placement flags to the current flags
997 ttm_flag_masked(&cur_flags, placement->busy_placement[i],
998 ~TTM_PL_MASK_MEMTYPE);
1001 if (mem_type == TTM_PL_SYSTEM) {
1002 mem->mem_type = mem_type;
1003 mem->placement = cur_flags;
1004 mem->mm_node = NULL;
1008 ret = ttm_bo_mem_force_space(bo, mem_type, placement, mem,
1009 interruptible, no_wait_reserve, no_wait_gpu);
1010 if (ret == 0 && mem->mm_node) {
1011 mem->placement = cur_flags;
1014 if (ret == -ERESTARTSYS)
1015 has_erestartsys = true;
1017 ret = (has_erestartsys) ? -ERESTARTSYS : -ENOMEM;
1020 EXPORT_SYMBOL(ttm_bo_mem_space);
1022 int ttm_bo_wait_cpu(struct ttm_buffer_object *bo, bool no_wait)
1024 if ((atomic_read(&bo->cpu_writers) > 0) && no_wait)
1027 return wait_event_interruptible(bo->event_queue,
1028 atomic_read(&bo->cpu_writers) == 0);
1030 EXPORT_SYMBOL(ttm_bo_wait_cpu);
1032 int ttm_bo_move_buffer(struct ttm_buffer_object *bo,
1033 struct ttm_placement *placement,
1034 bool interruptible, bool no_wait_reserve,
1038 struct ttm_mem_reg mem;
1040 BUG_ON(!atomic_read(&bo->reserved));
1043 * FIXME: It's possible to pipeline buffer moves.
1044 * Have the driver move function wait for idle when necessary,
1045 * instead of doing it here.
1047 spin_lock(&bo->lock);
1048 ret = ttm_bo_wait(bo, false, interruptible, no_wait_gpu);
1049 spin_unlock(&bo->lock);
1052 mem.num_pages = bo->num_pages;
1053 mem.size = mem.num_pages << PAGE_SHIFT;
1054 mem.page_alignment = bo->mem.page_alignment;
1055 mem.bus.io_reserved = false;
1057 * Determine where to move the buffer.
1059 ret = ttm_bo_mem_space(bo, placement, &mem, interruptible, no_wait_reserve, no_wait_gpu);
1062 ret = ttm_bo_handle_move_mem(bo, &mem, false, interruptible, no_wait_reserve, no_wait_gpu);
1064 if (ret && mem.mm_node)
1065 ttm_bo_mem_put(bo, &mem);
1069 static int ttm_bo_mem_compat(struct ttm_placement *placement,
1070 struct ttm_mem_reg *mem)
1074 if (mem->mm_node && placement->lpfn != 0 &&
1075 (mem->start < placement->fpfn ||
1076 mem->start + mem->num_pages > placement->lpfn))
1079 for (i = 0; i < placement->num_placement; i++) {
1080 if ((placement->placement[i] & mem->placement &
1081 TTM_PL_MASK_CACHING) &&
1082 (placement->placement[i] & mem->placement &
1089 int ttm_bo_validate(struct ttm_buffer_object *bo,
1090 struct ttm_placement *placement,
1091 bool interruptible, bool no_wait_reserve,
1096 BUG_ON(!atomic_read(&bo->reserved));
1097 /* Check that range is valid */
1098 if (placement->lpfn || placement->fpfn)
1099 if (placement->fpfn > placement->lpfn ||
1100 (placement->lpfn - placement->fpfn) < bo->num_pages)
1103 * Check whether we need to move buffer.
1105 ret = ttm_bo_mem_compat(placement, &bo->mem);
1107 ret = ttm_bo_move_buffer(bo, placement, interruptible, no_wait_reserve, no_wait_gpu);
1112 * Use the access and other non-mapping-related flag bits from
1113 * the compatible memory placement flags to the active flags
1115 ttm_flag_masked(&bo->mem.placement, placement->placement[ret],
1116 ~TTM_PL_MASK_MEMTYPE);
1119 * We might need to add a TTM.
1121 if (bo->mem.mem_type == TTM_PL_SYSTEM && bo->ttm == NULL) {
1122 ret = ttm_bo_add_ttm(bo, true);
1128 EXPORT_SYMBOL(ttm_bo_validate);
1130 int ttm_bo_check_placement(struct ttm_buffer_object *bo,
1131 struct ttm_placement *placement)
1133 BUG_ON((placement->fpfn || placement->lpfn) &&
1134 (bo->mem.num_pages > (placement->lpfn - placement->fpfn)));
1139 int ttm_bo_init(struct ttm_bo_device *bdev,
1140 struct ttm_buffer_object *bo,
1142 enum ttm_bo_type type,
1143 struct ttm_placement *placement,
1144 uint32_t page_alignment,
1145 unsigned long buffer_start,
1147 struct file *persistant_swap_storage,
1149 void (*destroy) (struct ttm_buffer_object *))
1152 unsigned long num_pages;
1154 size += buffer_start & ~PAGE_MASK;
1155 num_pages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
1156 if (num_pages == 0) {
1157 printk(KERN_ERR TTM_PFX "Illegal buffer object size.\n");
1164 bo->destroy = destroy;
1166 spin_lock_init(&bo->lock);
1167 kref_init(&bo->kref);
1168 kref_init(&bo->list_kref);
1169 atomic_set(&bo->cpu_writers, 0);
1170 atomic_set(&bo->reserved, 1);
1171 init_waitqueue_head(&bo->event_queue);
1172 INIT_LIST_HEAD(&bo->lru);
1173 INIT_LIST_HEAD(&bo->ddestroy);
1174 INIT_LIST_HEAD(&bo->swap);
1176 bo->glob = bdev->glob;
1178 bo->num_pages = num_pages;
1179 bo->mem.size = num_pages << PAGE_SHIFT;
1180 bo->mem.mem_type = TTM_PL_SYSTEM;
1181 bo->mem.num_pages = bo->num_pages;
1182 bo->mem.mm_node = NULL;
1183 bo->mem.page_alignment = page_alignment;
1184 bo->mem.bus.io_reserved = false;
1185 bo->buffer_start = buffer_start & PAGE_MASK;
1187 bo->mem.placement = (TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED);
1188 bo->seq_valid = false;
1189 bo->persistant_swap_storage = persistant_swap_storage;
1190 bo->acc_size = acc_size;
1191 atomic_inc(&bo->glob->bo_count);
1193 ret = ttm_bo_check_placement(bo, placement);
1194 if (unlikely(ret != 0))
1198 * For ttm_bo_type_device buffers, allocate
1199 * address space from the device.
1201 if (bo->type == ttm_bo_type_device) {
1202 ret = ttm_bo_setup_vm(bo);
1207 ret = ttm_bo_validate(bo, placement, interruptible, false, false);
1211 ttm_bo_unreserve(bo);
1215 ttm_bo_unreserve(bo);
1220 EXPORT_SYMBOL(ttm_bo_init);
1222 static inline size_t ttm_bo_size(struct ttm_bo_global *glob,
1223 unsigned long num_pages)
1225 size_t page_array_size = (num_pages * sizeof(void *) + PAGE_SIZE - 1) &
1228 return glob->ttm_bo_size + 2 * page_array_size;
1231 int ttm_bo_create(struct ttm_bo_device *bdev,
1233 enum ttm_bo_type type,
1234 struct ttm_placement *placement,
1235 uint32_t page_alignment,
1236 unsigned long buffer_start,
1238 struct file *persistant_swap_storage,
1239 struct ttm_buffer_object **p_bo)
1241 struct ttm_buffer_object *bo;
1242 struct ttm_mem_global *mem_glob = bdev->glob->mem_glob;
1246 ttm_bo_size(bdev->glob, (size + PAGE_SIZE - 1) >> PAGE_SHIFT);
1247 ret = ttm_mem_global_alloc(mem_glob, acc_size, false, false);
1248 if (unlikely(ret != 0))
1251 bo = kzalloc(sizeof(*bo), GFP_KERNEL);
1253 if (unlikely(bo == NULL)) {
1254 ttm_mem_global_free(mem_glob, acc_size);
1258 ret = ttm_bo_init(bdev, bo, size, type, placement, page_alignment,
1259 buffer_start, interruptible,
1260 persistant_swap_storage, acc_size, NULL);
1261 if (likely(ret == 0))
1267 static int ttm_bo_force_list_clean(struct ttm_bo_device *bdev,
1268 unsigned mem_type, bool allow_errors)
1270 struct ttm_mem_type_manager *man = &bdev->man[mem_type];
1271 struct ttm_bo_global *glob = bdev->glob;
1275 * Can't use standard list traversal since we're unlocking.
1278 spin_lock(&glob->lru_lock);
1279 while (!list_empty(&man->lru)) {
1280 spin_unlock(&glob->lru_lock);
1281 ret = ttm_mem_evict_first(bdev, mem_type, false, false, false);
1286 printk(KERN_ERR TTM_PFX
1287 "Cleanup eviction failed\n");
1290 spin_lock(&glob->lru_lock);
1292 spin_unlock(&glob->lru_lock);
1296 int ttm_bo_clean_mm(struct ttm_bo_device *bdev, unsigned mem_type)
1298 struct ttm_mem_type_manager *man;
1301 if (mem_type >= TTM_NUM_MEM_TYPES) {
1302 printk(KERN_ERR TTM_PFX "Illegal memory type %d\n", mem_type);
1305 man = &bdev->man[mem_type];
1307 if (!man->has_type) {
1308 printk(KERN_ERR TTM_PFX "Trying to take down uninitialized "
1309 "memory manager type %u\n", mem_type);
1313 man->use_type = false;
1314 man->has_type = false;
1318 ttm_bo_force_list_clean(bdev, mem_type, false);
1320 ret = (*man->func->takedown)(man);
1325 EXPORT_SYMBOL(ttm_bo_clean_mm);
1327 int ttm_bo_evict_mm(struct ttm_bo_device *bdev, unsigned mem_type)
1329 struct ttm_mem_type_manager *man = &bdev->man[mem_type];
1331 if (mem_type == 0 || mem_type >= TTM_NUM_MEM_TYPES) {
1332 printk(KERN_ERR TTM_PFX
1333 "Illegal memory manager memory type %u.\n",
1338 if (!man->has_type) {
1339 printk(KERN_ERR TTM_PFX
1340 "Memory type %u has not been initialized.\n",
1345 return ttm_bo_force_list_clean(bdev, mem_type, true);
1347 EXPORT_SYMBOL(ttm_bo_evict_mm);
1349 int ttm_bo_init_mm(struct ttm_bo_device *bdev, unsigned type,
1350 unsigned long p_size)
1353 struct ttm_mem_type_manager *man;
1355 BUG_ON(type >= TTM_NUM_MEM_TYPES);
1356 man = &bdev->man[type];
1357 BUG_ON(man->has_type);
1359 ret = bdev->driver->init_mem_type(bdev, type, man);
1365 if (type != TTM_PL_SYSTEM) {
1366 ret = (*man->func->init)(man, p_size);
1370 man->has_type = true;
1371 man->use_type = true;
1374 INIT_LIST_HEAD(&man->lru);
1378 EXPORT_SYMBOL(ttm_bo_init_mm);
1380 static void ttm_bo_global_kobj_release(struct kobject *kobj)
1382 struct ttm_bo_global *glob =
1383 container_of(kobj, struct ttm_bo_global, kobj);
1385 ttm_mem_unregister_shrink(glob->mem_glob, &glob->shrink);
1386 __free_page(glob->dummy_read_page);
1390 void ttm_bo_global_release(struct drm_global_reference *ref)
1392 struct ttm_bo_global *glob = ref->object;
1394 kobject_del(&glob->kobj);
1395 kobject_put(&glob->kobj);
1397 EXPORT_SYMBOL(ttm_bo_global_release);
1399 int ttm_bo_global_init(struct drm_global_reference *ref)
1401 struct ttm_bo_global_ref *bo_ref =
1402 container_of(ref, struct ttm_bo_global_ref, ref);
1403 struct ttm_bo_global *glob = ref->object;
1406 mutex_init(&glob->device_list_mutex);
1407 spin_lock_init(&glob->lru_lock);
1408 glob->mem_glob = bo_ref->mem_glob;
1409 glob->dummy_read_page = alloc_page(__GFP_ZERO | GFP_DMA32);
1411 if (unlikely(glob->dummy_read_page == NULL)) {
1416 INIT_LIST_HEAD(&glob->swap_lru);
1417 INIT_LIST_HEAD(&glob->device_list);
1419 ttm_mem_init_shrink(&glob->shrink, ttm_bo_swapout);
1420 ret = ttm_mem_register_shrink(glob->mem_glob, &glob->shrink);
1421 if (unlikely(ret != 0)) {
1422 printk(KERN_ERR TTM_PFX
1423 "Could not register buffer object swapout.\n");
1427 glob->ttm_bo_extra_size =
1428 ttm_round_pot(sizeof(struct ttm_tt)) +
1429 ttm_round_pot(sizeof(struct ttm_backend));
1431 glob->ttm_bo_size = glob->ttm_bo_extra_size +
1432 ttm_round_pot(sizeof(struct ttm_buffer_object));
1434 atomic_set(&glob->bo_count, 0);
1436 ret = kobject_init_and_add(
1437 &glob->kobj, &ttm_bo_glob_kobj_type, ttm_get_kobj(), "buffer_objects");
1438 if (unlikely(ret != 0))
1439 kobject_put(&glob->kobj);
1442 __free_page(glob->dummy_read_page);
1447 EXPORT_SYMBOL(ttm_bo_global_init);
1450 int ttm_bo_device_release(struct ttm_bo_device *bdev)
1453 unsigned i = TTM_NUM_MEM_TYPES;
1454 struct ttm_mem_type_manager *man;
1455 struct ttm_bo_global *glob = bdev->glob;
1458 man = &bdev->man[i];
1459 if (man->has_type) {
1460 man->use_type = false;
1461 if ((i != TTM_PL_SYSTEM) && ttm_bo_clean_mm(bdev, i)) {
1463 printk(KERN_ERR TTM_PFX
1464 "DRM memory manager type %d "
1465 "is not clean.\n", i);
1467 man->has_type = false;
1471 mutex_lock(&glob->device_list_mutex);
1472 list_del(&bdev->device_list);
1473 mutex_unlock(&glob->device_list_mutex);
1475 if (!cancel_delayed_work(&bdev->wq))
1476 flush_scheduled_work();
1478 while (ttm_bo_delayed_delete(bdev, true))
1481 spin_lock(&glob->lru_lock);
1482 if (list_empty(&bdev->ddestroy))
1483 TTM_DEBUG("Delayed destroy list was clean\n");
1485 if (list_empty(&bdev->man[0].lru))
1486 TTM_DEBUG("Swap list was clean\n");
1487 spin_unlock(&glob->lru_lock);
1489 BUG_ON(!drm_mm_clean(&bdev->addr_space_mm));
1490 write_lock(&bdev->vm_lock);
1491 drm_mm_takedown(&bdev->addr_space_mm);
1492 write_unlock(&bdev->vm_lock);
1496 EXPORT_SYMBOL(ttm_bo_device_release);
1498 int ttm_bo_device_init(struct ttm_bo_device *bdev,
1499 struct ttm_bo_global *glob,
1500 struct ttm_bo_driver *driver,
1501 uint64_t file_page_offset,
1506 rwlock_init(&bdev->vm_lock);
1507 bdev->driver = driver;
1509 memset(bdev->man, 0, sizeof(bdev->man));
1512 * Initialize the system memory buffer type.
1513 * Other types need to be driver / IOCTL initialized.
1515 ret = ttm_bo_init_mm(bdev, TTM_PL_SYSTEM, 0);
1516 if (unlikely(ret != 0))
1519 bdev->addr_space_rb = RB_ROOT;
1520 ret = drm_mm_init(&bdev->addr_space_mm, file_page_offset, 0x10000000);
1521 if (unlikely(ret != 0))
1522 goto out_no_addr_mm;
1524 INIT_DELAYED_WORK(&bdev->wq, ttm_bo_delayed_workqueue);
1525 bdev->nice_mode = true;
1526 INIT_LIST_HEAD(&bdev->ddestroy);
1527 bdev->dev_mapping = NULL;
1529 bdev->need_dma32 = need_dma32;
1531 mutex_lock(&glob->device_list_mutex);
1532 list_add_tail(&bdev->device_list, &glob->device_list);
1533 mutex_unlock(&glob->device_list_mutex);
1537 ttm_bo_clean_mm(bdev, 0);
1541 EXPORT_SYMBOL(ttm_bo_device_init);
1544 * buffer object vm functions.
1547 bool ttm_mem_reg_is_pci(struct ttm_bo_device *bdev, struct ttm_mem_reg *mem)
1549 struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
1551 if (!(man->flags & TTM_MEMTYPE_FLAG_FIXED)) {
1552 if (mem->mem_type == TTM_PL_SYSTEM)
1555 if (man->flags & TTM_MEMTYPE_FLAG_CMA)
1558 if (mem->placement & TTM_PL_FLAG_CACHED)
1564 void ttm_bo_unmap_virtual(struct ttm_buffer_object *bo)
1566 struct ttm_bo_device *bdev = bo->bdev;
1567 loff_t offset = (loff_t) bo->addr_space_offset;
1568 loff_t holelen = ((loff_t) bo->mem.num_pages) << PAGE_SHIFT;
1570 if (!bdev->dev_mapping)
1572 unmap_mapping_range(bdev->dev_mapping, offset, holelen, 1);
1573 ttm_mem_io_free(bdev, &bo->mem);
1575 EXPORT_SYMBOL(ttm_bo_unmap_virtual);
1577 static void ttm_bo_vm_insert_rb(struct ttm_buffer_object *bo)
1579 struct ttm_bo_device *bdev = bo->bdev;
1580 struct rb_node **cur = &bdev->addr_space_rb.rb_node;
1581 struct rb_node *parent = NULL;
1582 struct ttm_buffer_object *cur_bo;
1583 unsigned long offset = bo->vm_node->start;
1584 unsigned long cur_offset;
1588 cur_bo = rb_entry(parent, struct ttm_buffer_object, vm_rb);
1589 cur_offset = cur_bo->vm_node->start;
1590 if (offset < cur_offset)
1591 cur = &parent->rb_left;
1592 else if (offset > cur_offset)
1593 cur = &parent->rb_right;
1598 rb_link_node(&bo->vm_rb, parent, cur);
1599 rb_insert_color(&bo->vm_rb, &bdev->addr_space_rb);
1605 * @bo: the buffer to allocate address space for
1607 * Allocate address space in the drm device so that applications
1608 * can mmap the buffer and access the contents. This only
1609 * applies to ttm_bo_type_device objects as others are not
1610 * placed in the drm device address space.
1613 static int ttm_bo_setup_vm(struct ttm_buffer_object *bo)
1615 struct ttm_bo_device *bdev = bo->bdev;
1619 ret = drm_mm_pre_get(&bdev->addr_space_mm);
1620 if (unlikely(ret != 0))
1623 write_lock(&bdev->vm_lock);
1624 bo->vm_node = drm_mm_search_free(&bdev->addr_space_mm,
1625 bo->mem.num_pages, 0, 0);
1627 if (unlikely(bo->vm_node == NULL)) {
1632 bo->vm_node = drm_mm_get_block_atomic(bo->vm_node,
1633 bo->mem.num_pages, 0);
1635 if (unlikely(bo->vm_node == NULL)) {
1636 write_unlock(&bdev->vm_lock);
1640 ttm_bo_vm_insert_rb(bo);
1641 write_unlock(&bdev->vm_lock);
1642 bo->addr_space_offset = ((uint64_t) bo->vm_node->start) << PAGE_SHIFT;
1646 write_unlock(&bdev->vm_lock);
1650 int ttm_bo_wait(struct ttm_buffer_object *bo,
1651 bool lazy, bool interruptible, bool no_wait)
1653 struct ttm_bo_driver *driver = bo->bdev->driver;
1658 if (likely(bo->sync_obj == NULL))
1661 while (bo->sync_obj) {
1663 if (driver->sync_obj_signaled(bo->sync_obj, bo->sync_obj_arg)) {
1664 void *tmp_obj = bo->sync_obj;
1665 bo->sync_obj = NULL;
1666 clear_bit(TTM_BO_PRIV_FLAG_MOVING, &bo->priv_flags);
1667 spin_unlock(&bo->lock);
1668 driver->sync_obj_unref(&tmp_obj);
1669 spin_lock(&bo->lock);
1676 sync_obj = driver->sync_obj_ref(bo->sync_obj);
1677 sync_obj_arg = bo->sync_obj_arg;
1678 spin_unlock(&bo->lock);
1679 ret = driver->sync_obj_wait(sync_obj, sync_obj_arg,
1680 lazy, interruptible);
1681 if (unlikely(ret != 0)) {
1682 driver->sync_obj_unref(&sync_obj);
1683 spin_lock(&bo->lock);
1686 spin_lock(&bo->lock);
1687 if (likely(bo->sync_obj == sync_obj &&
1688 bo->sync_obj_arg == sync_obj_arg)) {
1689 void *tmp_obj = bo->sync_obj;
1690 bo->sync_obj = NULL;
1691 clear_bit(TTM_BO_PRIV_FLAG_MOVING,
1693 spin_unlock(&bo->lock);
1694 driver->sync_obj_unref(&sync_obj);
1695 driver->sync_obj_unref(&tmp_obj);
1696 spin_lock(&bo->lock);
1698 spin_unlock(&bo->lock);
1699 driver->sync_obj_unref(&sync_obj);
1700 spin_lock(&bo->lock);
1705 EXPORT_SYMBOL(ttm_bo_wait);
1707 int ttm_bo_synccpu_write_grab(struct ttm_buffer_object *bo, bool no_wait)
1712 * Using ttm_bo_reserve makes sure the lru lists are updated.
1715 ret = ttm_bo_reserve(bo, true, no_wait, false, 0);
1716 if (unlikely(ret != 0))
1718 spin_lock(&bo->lock);
1719 ret = ttm_bo_wait(bo, false, true, no_wait);
1720 spin_unlock(&bo->lock);
1721 if (likely(ret == 0))
1722 atomic_inc(&bo->cpu_writers);
1723 ttm_bo_unreserve(bo);
1726 EXPORT_SYMBOL(ttm_bo_synccpu_write_grab);
1728 void ttm_bo_synccpu_write_release(struct ttm_buffer_object *bo)
1730 if (atomic_dec_and_test(&bo->cpu_writers))
1731 wake_up_all(&bo->event_queue);
1733 EXPORT_SYMBOL(ttm_bo_synccpu_write_release);
1736 * A buffer object shrink method that tries to swap out the first
1737 * buffer object on the bo_global::swap_lru list.
1740 static int ttm_bo_swapout(struct ttm_mem_shrink *shrink)
1742 struct ttm_bo_global *glob =
1743 container_of(shrink, struct ttm_bo_global, shrink);
1744 struct ttm_buffer_object *bo;
1747 uint32_t swap_placement = (TTM_PL_FLAG_CACHED | TTM_PL_FLAG_SYSTEM);
1749 spin_lock(&glob->lru_lock);
1750 while (ret == -EBUSY) {
1751 if (unlikely(list_empty(&glob->swap_lru))) {
1752 spin_unlock(&glob->lru_lock);
1756 bo = list_first_entry(&glob->swap_lru,
1757 struct ttm_buffer_object, swap);
1758 kref_get(&bo->list_kref);
1760 if (!list_empty(&bo->ddestroy)) {
1761 spin_unlock(&glob->lru_lock);
1762 (void) ttm_bo_cleanup_refs(bo, false, false, false);
1763 kref_put(&bo->list_kref, ttm_bo_release_list);
1768 * Reserve buffer. Since we unlock while sleeping, we need
1769 * to re-check that nobody removed us from the swap-list while
1773 ret = ttm_bo_reserve_locked(bo, false, true, false, 0);
1774 if (unlikely(ret == -EBUSY)) {
1775 spin_unlock(&glob->lru_lock);
1776 ttm_bo_wait_unreserved(bo, false);
1777 kref_put(&bo->list_kref, ttm_bo_release_list);
1778 spin_lock(&glob->lru_lock);
1783 put_count = ttm_bo_del_from_lru(bo);
1784 spin_unlock(&glob->lru_lock);
1787 kref_put(&bo->list_kref, ttm_bo_ref_bug);
1790 * Wait for GPU, then move to system cached.
1793 spin_lock(&bo->lock);
1794 ret = ttm_bo_wait(bo, false, false, false);
1795 spin_unlock(&bo->lock);
1797 if (unlikely(ret != 0))
1800 if ((bo->mem.placement & swap_placement) != swap_placement) {
1801 struct ttm_mem_reg evict_mem;
1803 evict_mem = bo->mem;
1804 evict_mem.mm_node = NULL;
1805 evict_mem.placement = TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED;
1806 evict_mem.mem_type = TTM_PL_SYSTEM;
1808 ret = ttm_bo_handle_move_mem(bo, &evict_mem, true,
1809 false, false, false);
1810 if (unlikely(ret != 0))
1814 ttm_bo_unmap_virtual(bo);
1817 * Swap out. Buffer will be swapped in again as soon as
1818 * anyone tries to access a ttm page.
1821 if (bo->bdev->driver->swap_notify)
1822 bo->bdev->driver->swap_notify(bo);
1824 ret = ttm_tt_swapout(bo->ttm, bo->persistant_swap_storage);
1829 * Unreserve without putting on LRU to avoid swapping out an
1830 * already swapped buffer.
1833 atomic_set(&bo->reserved, 0);
1834 wake_up_all(&bo->event_queue);
1835 kref_put(&bo->list_kref, ttm_bo_release_list);
1839 void ttm_bo_swapout_all(struct ttm_bo_device *bdev)
1841 while (ttm_bo_swapout(&bdev->glob->shrink) == 0)
1844 EXPORT_SYMBOL(ttm_bo_swapout_all);