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 " io_offset: 0x%08lX\n", man->io_offset);
83 printk(KERN_ERR TTM_PFX " io_size: %ld\n", man->io_size);
84 printk(KERN_ERR TTM_PFX " size: %llu\n", man->size);
85 printk(KERN_ERR TTM_PFX " available_caching: 0x%08X\n",
86 man->available_caching);
87 printk(KERN_ERR TTM_PFX " default_caching: 0x%08X\n",
88 man->default_caching);
89 if (mem_type != TTM_PL_SYSTEM) {
90 spin_lock(&bdev->glob->lru_lock);
91 drm_mm_debug_table(&man->manager, TTM_PFX);
92 spin_unlock(&bdev->glob->lru_lock);
96 static void ttm_bo_mem_space_debug(struct ttm_buffer_object *bo,
97 struct ttm_placement *placement)
101 printk(KERN_ERR TTM_PFX "No space for %p (%lu pages, %luK, %luM)\n",
102 bo, bo->mem.num_pages, bo->mem.size >> 10,
104 for (i = 0; i < placement->num_placement; i++) {
105 ret = ttm_mem_type_from_flags(placement->placement[i],
109 printk(KERN_ERR TTM_PFX " placement[%d]=0x%08X (%d)\n",
110 i, placement->placement[i], mem_type);
111 ttm_mem_type_debug(bo->bdev, mem_type);
115 static ssize_t ttm_bo_global_show(struct kobject *kobj,
116 struct attribute *attr,
119 struct ttm_bo_global *glob =
120 container_of(kobj, struct ttm_bo_global, kobj);
122 return snprintf(buffer, PAGE_SIZE, "%lu\n",
123 (unsigned long) atomic_read(&glob->bo_count));
126 static struct attribute *ttm_bo_global_attrs[] = {
131 static struct sysfs_ops ttm_bo_global_ops = {
132 .show = &ttm_bo_global_show
135 static struct kobj_type ttm_bo_glob_kobj_type = {
136 .release = &ttm_bo_global_kobj_release,
137 .sysfs_ops = &ttm_bo_global_ops,
138 .default_attrs = ttm_bo_global_attrs
142 static inline uint32_t ttm_bo_type_flags(unsigned type)
147 static void ttm_bo_release_list(struct kref *list_kref)
149 struct ttm_buffer_object *bo =
150 container_of(list_kref, struct ttm_buffer_object, list_kref);
151 struct ttm_bo_device *bdev = bo->bdev;
153 BUG_ON(atomic_read(&bo->list_kref.refcount));
154 BUG_ON(atomic_read(&bo->kref.refcount));
155 BUG_ON(atomic_read(&bo->cpu_writers));
156 BUG_ON(bo->sync_obj != NULL);
157 BUG_ON(bo->mem.mm_node != NULL);
158 BUG_ON(!list_empty(&bo->lru));
159 BUG_ON(!list_empty(&bo->ddestroy));
162 ttm_tt_destroy(bo->ttm);
163 atomic_dec(&bo->glob->bo_count);
167 ttm_mem_global_free(bdev->glob->mem_glob, bo->acc_size);
172 int ttm_bo_wait_unreserved(struct ttm_buffer_object *bo, bool interruptible)
178 ret = wait_event_interruptible(bo->event_queue,
179 atomic_read(&bo->reserved) == 0);
180 if (unlikely(ret != 0))
183 wait_event(bo->event_queue, atomic_read(&bo->reserved) == 0);
187 EXPORT_SYMBOL(ttm_bo_wait_unreserved);
189 static void ttm_bo_add_to_lru(struct ttm_buffer_object *bo)
191 struct ttm_bo_device *bdev = bo->bdev;
192 struct ttm_mem_type_manager *man;
194 BUG_ON(!atomic_read(&bo->reserved));
196 if (!(bo->mem.placement & TTM_PL_FLAG_NO_EVICT)) {
198 BUG_ON(!list_empty(&bo->lru));
200 man = &bdev->man[bo->mem.mem_type];
201 list_add_tail(&bo->lru, &man->lru);
202 kref_get(&bo->list_kref);
204 if (bo->ttm != NULL) {
205 list_add_tail(&bo->swap, &bo->glob->swap_lru);
206 kref_get(&bo->list_kref);
212 * Call with the lru_lock held.
215 static int ttm_bo_del_from_lru(struct ttm_buffer_object *bo)
219 if (!list_empty(&bo->swap)) {
220 list_del_init(&bo->swap);
223 if (!list_empty(&bo->lru)) {
224 list_del_init(&bo->lru);
229 * TODO: Add a driver hook to delete from
230 * driver-specific LRU's here.
236 int ttm_bo_reserve_locked(struct ttm_buffer_object *bo,
238 bool no_wait, bool use_sequence, uint32_t sequence)
240 struct ttm_bo_global *glob = bo->glob;
243 while (unlikely(atomic_cmpxchg(&bo->reserved, 0, 1) != 0)) {
244 if (use_sequence && bo->seq_valid &&
245 (sequence - bo->val_seq < (1 << 31))) {
252 spin_unlock(&glob->lru_lock);
253 ret = ttm_bo_wait_unreserved(bo, interruptible);
254 spin_lock(&glob->lru_lock);
261 bo->val_seq = sequence;
262 bo->seq_valid = true;
264 bo->seq_valid = false;
269 EXPORT_SYMBOL(ttm_bo_reserve);
271 static void ttm_bo_ref_bug(struct kref *list_kref)
276 int ttm_bo_reserve(struct ttm_buffer_object *bo,
278 bool no_wait, bool use_sequence, uint32_t sequence)
280 struct ttm_bo_global *glob = bo->glob;
284 spin_lock(&glob->lru_lock);
285 ret = ttm_bo_reserve_locked(bo, interruptible, no_wait, use_sequence,
287 if (likely(ret == 0))
288 put_count = ttm_bo_del_from_lru(bo);
289 spin_unlock(&glob->lru_lock);
292 kref_put(&bo->list_kref, ttm_bo_ref_bug);
297 void ttm_bo_unreserve(struct ttm_buffer_object *bo)
299 struct ttm_bo_global *glob = bo->glob;
301 spin_lock(&glob->lru_lock);
302 ttm_bo_add_to_lru(bo);
303 atomic_set(&bo->reserved, 0);
304 wake_up_all(&bo->event_queue);
305 spin_unlock(&glob->lru_lock);
307 EXPORT_SYMBOL(ttm_bo_unreserve);
310 * Call bo->mutex locked.
312 static int ttm_bo_add_ttm(struct ttm_buffer_object *bo, bool zero_alloc)
314 struct ttm_bo_device *bdev = bo->bdev;
315 struct ttm_bo_global *glob = bo->glob;
317 uint32_t page_flags = 0;
319 TTM_ASSERT_LOCKED(&bo->mutex);
322 if (bdev->need_dma32)
323 page_flags |= TTM_PAGE_FLAG_DMA32;
326 case ttm_bo_type_device:
328 page_flags |= TTM_PAGE_FLAG_ZERO_ALLOC;
329 case ttm_bo_type_kernel:
330 bo->ttm = ttm_tt_create(bdev, bo->num_pages << PAGE_SHIFT,
331 page_flags, glob->dummy_read_page);
332 if (unlikely(bo->ttm == NULL))
335 case ttm_bo_type_user:
336 bo->ttm = ttm_tt_create(bdev, bo->num_pages << PAGE_SHIFT,
337 page_flags | TTM_PAGE_FLAG_USER,
338 glob->dummy_read_page);
339 if (unlikely(bo->ttm == NULL)) {
344 ret = ttm_tt_set_user(bo->ttm, current,
345 bo->buffer_start, bo->num_pages);
346 if (unlikely(ret != 0))
347 ttm_tt_destroy(bo->ttm);
350 printk(KERN_ERR TTM_PFX "Illegal buffer object type\n");
358 static int ttm_bo_handle_move_mem(struct ttm_buffer_object *bo,
359 struct ttm_mem_reg *mem,
360 bool evict, bool interruptible, bool no_wait)
362 struct ttm_bo_device *bdev = bo->bdev;
363 bool old_is_pci = ttm_mem_reg_is_pci(bdev, &bo->mem);
364 bool new_is_pci = ttm_mem_reg_is_pci(bdev, mem);
365 struct ttm_mem_type_manager *old_man = &bdev->man[bo->mem.mem_type];
366 struct ttm_mem_type_manager *new_man = &bdev->man[mem->mem_type];
369 if (old_is_pci || new_is_pci ||
370 ((mem->placement & bo->mem.placement & TTM_PL_MASK_CACHING) == 0))
371 ttm_bo_unmap_virtual(bo);
374 * Create and bind a ttm if required.
377 if (!(new_man->flags & TTM_MEMTYPE_FLAG_FIXED) && (bo->ttm == NULL)) {
378 ret = ttm_bo_add_ttm(bo, false);
382 ret = ttm_tt_set_placement_caching(bo->ttm, mem->placement);
386 if (mem->mem_type != TTM_PL_SYSTEM) {
387 ret = ttm_tt_bind(bo->ttm, mem);
392 if (bo->mem.mem_type == TTM_PL_SYSTEM) {
400 if (bdev->driver->move_notify)
401 bdev->driver->move_notify(bo, mem);
403 if (!(old_man->flags & TTM_MEMTYPE_FLAG_FIXED) &&
404 !(new_man->flags & TTM_MEMTYPE_FLAG_FIXED))
405 ret = ttm_bo_move_ttm(bo, evict, no_wait, mem);
406 else if (bdev->driver->move)
407 ret = bdev->driver->move(bo, evict, interruptible,
410 ret = ttm_bo_move_memcpy(bo, evict, no_wait, mem);
417 ret = bdev->driver->invalidate_caches(bdev, bo->mem.placement);
419 printk(KERN_ERR TTM_PFX "Can not flush read caches\n");
423 if (bo->mem.mm_node) {
424 spin_lock(&bo->lock);
425 bo->offset = (bo->mem.mm_node->start << PAGE_SHIFT) +
426 bdev->man[bo->mem.mem_type].gpu_offset;
427 bo->cur_placement = bo->mem.placement;
428 spin_unlock(&bo->lock);
435 new_man = &bdev->man[bo->mem.mem_type];
436 if ((new_man->flags & TTM_MEMTYPE_FLAG_FIXED) && bo->ttm) {
437 ttm_tt_unbind(bo->ttm);
438 ttm_tt_destroy(bo->ttm);
446 * If bo idle, remove from delayed- and lru lists, and unref.
447 * If not idle, and already on delayed list, do nothing.
448 * If not idle, and not on delayed list, put on delayed list,
449 * up the list_kref and schedule a delayed list check.
452 static int ttm_bo_cleanup_refs(struct ttm_buffer_object *bo, bool remove_all)
454 struct ttm_bo_device *bdev = bo->bdev;
455 struct ttm_bo_global *glob = bo->glob;
456 struct ttm_bo_driver *driver = bdev->driver;
459 spin_lock(&bo->lock);
460 (void) ttm_bo_wait(bo, false, false, !remove_all);
465 spin_unlock(&bo->lock);
467 spin_lock(&glob->lru_lock);
468 put_count = ttm_bo_del_from_lru(bo);
470 ret = ttm_bo_reserve_locked(bo, false, false, false, 0);
473 ttm_tt_unbind(bo->ttm);
475 if (!list_empty(&bo->ddestroy)) {
476 list_del_init(&bo->ddestroy);
479 if (bo->mem.mm_node) {
480 bo->mem.mm_node->private = NULL;
481 drm_mm_put_block(bo->mem.mm_node);
482 bo->mem.mm_node = NULL;
484 spin_unlock(&glob->lru_lock);
486 atomic_set(&bo->reserved, 0);
489 kref_put(&bo->list_kref, ttm_bo_ref_bug);
494 spin_lock(&glob->lru_lock);
495 if (list_empty(&bo->ddestroy)) {
496 void *sync_obj = bo->sync_obj;
497 void *sync_obj_arg = bo->sync_obj_arg;
499 kref_get(&bo->list_kref);
500 list_add_tail(&bo->ddestroy, &bdev->ddestroy);
501 spin_unlock(&glob->lru_lock);
502 spin_unlock(&bo->lock);
505 driver->sync_obj_flush(sync_obj, sync_obj_arg);
506 schedule_delayed_work(&bdev->wq,
507 ((HZ / 100) < 1) ? 1 : HZ / 100);
511 spin_unlock(&glob->lru_lock);
512 spin_unlock(&bo->lock);
520 * Traverse the delayed list, and call ttm_bo_cleanup_refs on all
521 * encountered buffers.
524 static int ttm_bo_delayed_delete(struct ttm_bo_device *bdev, bool remove_all)
526 struct ttm_bo_global *glob = bdev->glob;
527 struct ttm_buffer_object *entry = NULL;
530 spin_lock(&glob->lru_lock);
531 if (list_empty(&bdev->ddestroy))
534 entry = list_first_entry(&bdev->ddestroy,
535 struct ttm_buffer_object, ddestroy);
536 kref_get(&entry->list_kref);
539 struct ttm_buffer_object *nentry = NULL;
541 if (entry->ddestroy.next != &bdev->ddestroy) {
542 nentry = list_first_entry(&entry->ddestroy,
543 struct ttm_buffer_object, ddestroy);
544 kref_get(&nentry->list_kref);
547 spin_unlock(&glob->lru_lock);
548 ret = ttm_bo_cleanup_refs(entry, remove_all);
549 kref_put(&entry->list_kref, ttm_bo_release_list);
555 spin_lock(&glob->lru_lock);
556 if (list_empty(&entry->ddestroy))
561 spin_unlock(&glob->lru_lock);
564 kref_put(&entry->list_kref, ttm_bo_release_list);
568 static void ttm_bo_delayed_workqueue(struct work_struct *work)
570 struct ttm_bo_device *bdev =
571 container_of(work, struct ttm_bo_device, wq.work);
573 if (ttm_bo_delayed_delete(bdev, false)) {
574 schedule_delayed_work(&bdev->wq,
575 ((HZ / 100) < 1) ? 1 : HZ / 100);
579 static void ttm_bo_release(struct kref *kref)
581 struct ttm_buffer_object *bo =
582 container_of(kref, struct ttm_buffer_object, kref);
583 struct ttm_bo_device *bdev = bo->bdev;
585 if (likely(bo->vm_node != NULL)) {
586 rb_erase(&bo->vm_rb, &bdev->addr_space_rb);
587 drm_mm_put_block(bo->vm_node);
590 write_unlock(&bdev->vm_lock);
591 ttm_bo_cleanup_refs(bo, false);
592 kref_put(&bo->list_kref, ttm_bo_release_list);
593 write_lock(&bdev->vm_lock);
596 void ttm_bo_unref(struct ttm_buffer_object **p_bo)
598 struct ttm_buffer_object *bo = *p_bo;
599 struct ttm_bo_device *bdev = bo->bdev;
602 write_lock(&bdev->vm_lock);
603 kref_put(&bo->kref, ttm_bo_release);
604 write_unlock(&bdev->vm_lock);
606 EXPORT_SYMBOL(ttm_bo_unref);
608 static int ttm_bo_evict(struct ttm_buffer_object *bo, bool interruptible,
611 struct ttm_bo_device *bdev = bo->bdev;
612 struct ttm_bo_global *glob = bo->glob;
613 struct ttm_mem_reg evict_mem;
614 struct ttm_placement placement;
617 spin_lock(&bo->lock);
618 ret = ttm_bo_wait(bo, false, interruptible, no_wait);
619 spin_unlock(&bo->lock);
621 if (unlikely(ret != 0)) {
622 if (ret != -ERESTARTSYS) {
623 printk(KERN_ERR TTM_PFX
624 "Failed to expire sync object before "
625 "buffer eviction.\n");
630 BUG_ON(!atomic_read(&bo->reserved));
633 evict_mem.mm_node = NULL;
637 placement.num_placement = 0;
638 placement.num_busy_placement = 0;
639 bdev->driver->evict_flags(bo, &placement);
640 ret = ttm_bo_mem_space(bo, &placement, &evict_mem, interruptible,
643 if (ret != -ERESTARTSYS) {
644 printk(KERN_ERR TTM_PFX
645 "Failed to find memory space for "
646 "buffer 0x%p eviction.\n", bo);
647 ttm_bo_mem_space_debug(bo, &placement);
652 ret = ttm_bo_handle_move_mem(bo, &evict_mem, true, interruptible,
655 if (ret != -ERESTARTSYS)
656 printk(KERN_ERR TTM_PFX "Buffer eviction failed\n");
657 spin_lock(&glob->lru_lock);
658 if (evict_mem.mm_node) {
659 evict_mem.mm_node->private = NULL;
660 drm_mm_put_block(evict_mem.mm_node);
661 evict_mem.mm_node = NULL;
663 spin_unlock(&glob->lru_lock);
671 static int ttm_mem_evict_first(struct ttm_bo_device *bdev,
673 bool interruptible, bool no_wait)
675 struct ttm_bo_global *glob = bdev->glob;
676 struct ttm_mem_type_manager *man = &bdev->man[mem_type];
677 struct ttm_buffer_object *bo;
678 int ret, put_count = 0;
681 spin_lock(&glob->lru_lock);
682 if (list_empty(&man->lru)) {
683 spin_unlock(&glob->lru_lock);
687 bo = list_first_entry(&man->lru, struct ttm_buffer_object, lru);
688 kref_get(&bo->list_kref);
690 ret = ttm_bo_reserve_locked(bo, false, true, false, 0);
692 if (unlikely(ret == -EBUSY)) {
693 spin_unlock(&glob->lru_lock);
694 if (likely(!no_wait))
695 ret = ttm_bo_wait_unreserved(bo, interruptible);
697 kref_put(&bo->list_kref, ttm_bo_release_list);
700 * We *need* to retry after releasing the lru lock.
703 if (unlikely(ret != 0))
708 put_count = ttm_bo_del_from_lru(bo);
709 spin_unlock(&glob->lru_lock);
714 kref_put(&bo->list_kref, ttm_bo_ref_bug);
716 ret = ttm_bo_evict(bo, interruptible, no_wait);
717 ttm_bo_unreserve(bo);
719 kref_put(&bo->list_kref, ttm_bo_release_list);
723 static int ttm_bo_man_get_node(struct ttm_buffer_object *bo,
724 struct ttm_mem_type_manager *man,
725 struct ttm_placement *placement,
726 struct ttm_mem_reg *mem,
727 struct drm_mm_node **node)
729 struct ttm_bo_global *glob = bo->glob;
733 lpfn = placement->lpfn;
738 ret = drm_mm_pre_get(&man->manager);
742 spin_lock(&glob->lru_lock);
743 *node = drm_mm_search_free_in_range(&man->manager,
744 mem->num_pages, mem->page_alignment,
745 placement->fpfn, lpfn, 1);
746 if (unlikely(*node == NULL)) {
747 spin_unlock(&glob->lru_lock);
750 *node = drm_mm_get_block_atomic_range(*node, mem->num_pages,
754 spin_unlock(&glob->lru_lock);
755 } while (*node == NULL);
760 * Repeatedly evict memory from the LRU for @mem_type until we create enough
761 * space, or we've evicted everything and there isn't enough space.
763 static int ttm_bo_mem_force_space(struct ttm_buffer_object *bo,
765 struct ttm_placement *placement,
766 struct ttm_mem_reg *mem,
767 bool interruptible, bool no_wait)
769 struct ttm_bo_device *bdev = bo->bdev;
770 struct ttm_bo_global *glob = bdev->glob;
771 struct ttm_mem_type_manager *man = &bdev->man[mem_type];
772 struct drm_mm_node *node;
776 ret = ttm_bo_man_get_node(bo, man, placement, mem, &node);
777 if (unlikely(ret != 0))
781 spin_lock(&glob->lru_lock);
782 if (list_empty(&man->lru)) {
783 spin_unlock(&glob->lru_lock);
786 spin_unlock(&glob->lru_lock);
787 ret = ttm_mem_evict_first(bdev, mem_type, interruptible,
789 if (unlikely(ret != 0))
795 mem->mem_type = mem_type;
799 static uint32_t ttm_bo_select_caching(struct ttm_mem_type_manager *man,
800 uint32_t cur_placement,
801 uint32_t proposed_placement)
803 uint32_t caching = proposed_placement & TTM_PL_MASK_CACHING;
804 uint32_t result = proposed_placement & ~TTM_PL_MASK_CACHING;
807 * Keep current caching if possible.
810 if ((cur_placement & caching) != 0)
811 result |= (cur_placement & caching);
812 else if ((man->default_caching & caching) != 0)
813 result |= man->default_caching;
814 else if ((TTM_PL_FLAG_CACHED & caching) != 0)
815 result |= TTM_PL_FLAG_CACHED;
816 else if ((TTM_PL_FLAG_WC & caching) != 0)
817 result |= TTM_PL_FLAG_WC;
818 else if ((TTM_PL_FLAG_UNCACHED & caching) != 0)
819 result |= TTM_PL_FLAG_UNCACHED;
824 static bool ttm_bo_mt_compatible(struct ttm_mem_type_manager *man,
827 uint32_t proposed_placement,
828 uint32_t *masked_placement)
830 uint32_t cur_flags = ttm_bo_type_flags(mem_type);
832 if ((man->flags & TTM_MEMTYPE_FLAG_FIXED) && disallow_fixed)
835 if ((cur_flags & proposed_placement & TTM_PL_MASK_MEM) == 0)
838 if ((proposed_placement & man->available_caching) == 0)
841 cur_flags |= (proposed_placement & man->available_caching);
843 *masked_placement = cur_flags;
848 * Creates space for memory region @mem according to its type.
850 * This function first searches for free space in compatible memory types in
851 * the priority order defined by the driver. If free space isn't found, then
852 * ttm_bo_mem_force_space is attempted in priority order to evict and find
855 int ttm_bo_mem_space(struct ttm_buffer_object *bo,
856 struct ttm_placement *placement,
857 struct ttm_mem_reg *mem,
858 bool interruptible, bool no_wait)
860 struct ttm_bo_device *bdev = bo->bdev;
861 struct ttm_mem_type_manager *man;
862 uint32_t mem_type = TTM_PL_SYSTEM;
863 uint32_t cur_flags = 0;
864 bool type_found = false;
865 bool type_ok = false;
866 bool has_erestartsys = false;
867 struct drm_mm_node *node = NULL;
871 for (i = 0; i < placement->num_placement; ++i) {
872 ret = ttm_mem_type_from_flags(placement->placement[i],
876 man = &bdev->man[mem_type];
878 type_ok = ttm_bo_mt_compatible(man,
879 bo->type == ttm_bo_type_user,
881 placement->placement[i],
887 cur_flags = ttm_bo_select_caching(man, bo->mem.placement,
890 * Use the access and other non-mapping-related flag bits from
891 * the memory placement flags to the current flags
893 ttm_flag_masked(&cur_flags, placement->placement[i],
894 ~TTM_PL_MASK_MEMTYPE);
896 if (mem_type == TTM_PL_SYSTEM)
899 if (man->has_type && man->use_type) {
901 ret = ttm_bo_man_get_node(bo, man, placement, mem,
910 if ((type_ok && (mem_type == TTM_PL_SYSTEM)) || node) {
912 mem->mem_type = mem_type;
913 mem->placement = cur_flags;
922 for (i = 0; i < placement->num_busy_placement; ++i) {
923 ret = ttm_mem_type_from_flags(placement->busy_placement[i],
927 man = &bdev->man[mem_type];
930 if (!ttm_bo_mt_compatible(man,
931 bo->type == ttm_bo_type_user,
933 placement->busy_placement[i],
937 cur_flags = ttm_bo_select_caching(man, bo->mem.placement,
940 * Use the access and other non-mapping-related flag bits from
941 * the memory placement flags to the current flags
943 ttm_flag_masked(&cur_flags, placement->busy_placement[i],
944 ~TTM_PL_MASK_MEMTYPE);
946 ret = ttm_bo_mem_force_space(bo, mem_type, placement, mem,
947 interruptible, no_wait);
948 if (ret == 0 && mem->mm_node) {
949 mem->placement = cur_flags;
950 mem->mm_node->private = bo;
953 if (ret == -ERESTARTSYS)
954 has_erestartsys = true;
956 ret = (has_erestartsys) ? -ERESTARTSYS : -ENOMEM;
959 EXPORT_SYMBOL(ttm_bo_mem_space);
961 int ttm_bo_wait_cpu(struct ttm_buffer_object *bo, bool no_wait)
963 if ((atomic_read(&bo->cpu_writers) > 0) && no_wait)
966 return wait_event_interruptible(bo->event_queue,
967 atomic_read(&bo->cpu_writers) == 0);
969 EXPORT_SYMBOL(ttm_bo_wait_cpu);
971 int ttm_bo_move_buffer(struct ttm_buffer_object *bo,
972 struct ttm_placement *placement,
973 bool interruptible, bool no_wait)
975 struct ttm_bo_global *glob = bo->glob;
977 struct ttm_mem_reg mem;
979 BUG_ON(!atomic_read(&bo->reserved));
982 * FIXME: It's possible to pipeline buffer moves.
983 * Have the driver move function wait for idle when necessary,
984 * instead of doing it here.
986 spin_lock(&bo->lock);
987 ret = ttm_bo_wait(bo, false, interruptible, no_wait);
988 spin_unlock(&bo->lock);
991 mem.num_pages = bo->num_pages;
992 mem.size = mem.num_pages << PAGE_SHIFT;
993 mem.page_alignment = bo->mem.page_alignment;
995 * Determine where to move the buffer.
997 ret = ttm_bo_mem_space(bo, placement, &mem, interruptible, no_wait);
1000 ret = ttm_bo_handle_move_mem(bo, &mem, false, interruptible, no_wait);
1002 if (ret && mem.mm_node) {
1003 spin_lock(&glob->lru_lock);
1004 mem.mm_node->private = NULL;
1005 drm_mm_put_block(mem.mm_node);
1006 spin_unlock(&glob->lru_lock);
1011 static int ttm_bo_mem_compat(struct ttm_placement *placement,
1012 struct ttm_mem_reg *mem)
1016 for (i = 0; i < placement->num_placement; i++) {
1017 if ((placement->placement[i] & mem->placement &
1018 TTM_PL_MASK_CACHING) &&
1019 (placement->placement[i] & mem->placement &
1026 int ttm_bo_validate(struct ttm_buffer_object *bo,
1027 struct ttm_placement *placement,
1028 bool interruptible, bool no_wait)
1032 BUG_ON(!atomic_read(&bo->reserved));
1033 /* Check that range is valid */
1034 if (placement->lpfn || placement->fpfn)
1035 if (placement->fpfn > placement->lpfn ||
1036 (placement->lpfn - placement->fpfn) < bo->num_pages)
1039 * Check whether we need to move buffer.
1041 ret = ttm_bo_mem_compat(placement, &bo->mem);
1043 ret = ttm_bo_move_buffer(bo, placement, interruptible, no_wait);
1048 * Use the access and other non-mapping-related flag bits from
1049 * the compatible memory placement flags to the active flags
1051 ttm_flag_masked(&bo->mem.placement, placement->placement[ret],
1052 ~TTM_PL_MASK_MEMTYPE);
1055 * We might need to add a TTM.
1057 if (bo->mem.mem_type == TTM_PL_SYSTEM && bo->ttm == NULL) {
1058 ret = ttm_bo_add_ttm(bo, true);
1064 EXPORT_SYMBOL(ttm_bo_validate);
1066 int ttm_bo_check_placement(struct ttm_buffer_object *bo,
1067 struct ttm_placement *placement)
1071 if (placement->fpfn || placement->lpfn) {
1072 if (bo->mem.num_pages > (placement->lpfn - placement->fpfn)) {
1073 printk(KERN_ERR TTM_PFX "Page number range to small "
1074 "Need %lu pages, range is [%u, %u]\n",
1075 bo->mem.num_pages, placement->fpfn,
1080 for (i = 0; i < placement->num_placement; i++) {
1081 if (!capable(CAP_SYS_ADMIN)) {
1082 if (placement->placement[i] & TTM_PL_FLAG_NO_EVICT) {
1083 printk(KERN_ERR TTM_PFX "Need to be root to "
1084 "modify NO_EVICT status.\n");
1089 for (i = 0; i < placement->num_busy_placement; i++) {
1090 if (!capable(CAP_SYS_ADMIN)) {
1091 if (placement->busy_placement[i] & TTM_PL_FLAG_NO_EVICT) {
1092 printk(KERN_ERR TTM_PFX "Need to be root to "
1093 "modify NO_EVICT status.\n");
1101 int ttm_bo_init(struct ttm_bo_device *bdev,
1102 struct ttm_buffer_object *bo,
1104 enum ttm_bo_type type,
1105 struct ttm_placement *placement,
1106 uint32_t page_alignment,
1107 unsigned long buffer_start,
1109 struct file *persistant_swap_storage,
1111 void (*destroy) (struct ttm_buffer_object *))
1114 unsigned long num_pages;
1116 size += buffer_start & ~PAGE_MASK;
1117 num_pages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
1118 if (num_pages == 0) {
1119 printk(KERN_ERR TTM_PFX "Illegal buffer object size.\n");
1122 bo->destroy = destroy;
1124 spin_lock_init(&bo->lock);
1125 kref_init(&bo->kref);
1126 kref_init(&bo->list_kref);
1127 atomic_set(&bo->cpu_writers, 0);
1128 atomic_set(&bo->reserved, 1);
1129 init_waitqueue_head(&bo->event_queue);
1130 INIT_LIST_HEAD(&bo->lru);
1131 INIT_LIST_HEAD(&bo->ddestroy);
1132 INIT_LIST_HEAD(&bo->swap);
1134 bo->glob = bdev->glob;
1136 bo->num_pages = num_pages;
1137 bo->mem.size = num_pages << PAGE_SHIFT;
1138 bo->mem.mem_type = TTM_PL_SYSTEM;
1139 bo->mem.num_pages = bo->num_pages;
1140 bo->mem.mm_node = NULL;
1141 bo->mem.page_alignment = page_alignment;
1142 bo->buffer_start = buffer_start & PAGE_MASK;
1144 bo->mem.placement = (TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED);
1145 bo->seq_valid = false;
1146 bo->persistant_swap_storage = persistant_swap_storage;
1147 bo->acc_size = acc_size;
1148 atomic_inc(&bo->glob->bo_count);
1150 ret = ttm_bo_check_placement(bo, placement);
1151 if (unlikely(ret != 0))
1155 * For ttm_bo_type_device buffers, allocate
1156 * address space from the device.
1158 if (bo->type == ttm_bo_type_device) {
1159 ret = ttm_bo_setup_vm(bo);
1164 ret = ttm_bo_validate(bo, placement, interruptible, false);
1168 ttm_bo_unreserve(bo);
1172 ttm_bo_unreserve(bo);
1177 EXPORT_SYMBOL(ttm_bo_init);
1179 static inline size_t ttm_bo_size(struct ttm_bo_global *glob,
1180 unsigned long num_pages)
1182 size_t page_array_size = (num_pages * sizeof(void *) + PAGE_SIZE - 1) &
1185 return glob->ttm_bo_size + 2 * page_array_size;
1188 int ttm_bo_create(struct ttm_bo_device *bdev,
1190 enum ttm_bo_type type,
1191 struct ttm_placement *placement,
1192 uint32_t page_alignment,
1193 unsigned long buffer_start,
1195 struct file *persistant_swap_storage,
1196 struct ttm_buffer_object **p_bo)
1198 struct ttm_buffer_object *bo;
1199 struct ttm_mem_global *mem_glob = bdev->glob->mem_glob;
1203 ttm_bo_size(bdev->glob, (size + PAGE_SIZE - 1) >> PAGE_SHIFT);
1204 ret = ttm_mem_global_alloc(mem_glob, acc_size, false, false);
1205 if (unlikely(ret != 0))
1208 bo = kzalloc(sizeof(*bo), GFP_KERNEL);
1210 if (unlikely(bo == NULL)) {
1211 ttm_mem_global_free(mem_glob, acc_size);
1215 ret = ttm_bo_init(bdev, bo, size, type, placement, page_alignment,
1216 buffer_start, interruptible,
1217 persistant_swap_storage, acc_size, NULL);
1218 if (likely(ret == 0))
1224 static int ttm_bo_force_list_clean(struct ttm_bo_device *bdev,
1225 unsigned mem_type, bool allow_errors)
1227 struct ttm_mem_type_manager *man = &bdev->man[mem_type];
1228 struct ttm_bo_global *glob = bdev->glob;
1232 * Can't use standard list traversal since we're unlocking.
1235 spin_lock(&glob->lru_lock);
1236 while (!list_empty(&man->lru)) {
1237 spin_unlock(&glob->lru_lock);
1238 ret = ttm_mem_evict_first(bdev, mem_type, false, false);
1243 printk(KERN_ERR TTM_PFX
1244 "Cleanup eviction failed\n");
1247 spin_lock(&glob->lru_lock);
1249 spin_unlock(&glob->lru_lock);
1253 int ttm_bo_clean_mm(struct ttm_bo_device *bdev, unsigned mem_type)
1255 struct ttm_bo_global *glob = bdev->glob;
1256 struct ttm_mem_type_manager *man;
1259 if (mem_type >= TTM_NUM_MEM_TYPES) {
1260 printk(KERN_ERR TTM_PFX "Illegal memory type %d\n", mem_type);
1263 man = &bdev->man[mem_type];
1265 if (!man->has_type) {
1266 printk(KERN_ERR TTM_PFX "Trying to take down uninitialized "
1267 "memory manager type %u\n", mem_type);
1271 man->use_type = false;
1272 man->has_type = false;
1276 ttm_bo_force_list_clean(bdev, mem_type, false);
1278 spin_lock(&glob->lru_lock);
1279 if (drm_mm_clean(&man->manager))
1280 drm_mm_takedown(&man->manager);
1284 spin_unlock(&glob->lru_lock);
1289 EXPORT_SYMBOL(ttm_bo_clean_mm);
1291 int ttm_bo_evict_mm(struct ttm_bo_device *bdev, unsigned mem_type)
1293 struct ttm_mem_type_manager *man = &bdev->man[mem_type];
1295 if (mem_type == 0 || mem_type >= TTM_NUM_MEM_TYPES) {
1296 printk(KERN_ERR TTM_PFX
1297 "Illegal memory manager memory type %u.\n",
1302 if (!man->has_type) {
1303 printk(KERN_ERR TTM_PFX
1304 "Memory type %u has not been initialized.\n",
1309 return ttm_bo_force_list_clean(bdev, mem_type, true);
1311 EXPORT_SYMBOL(ttm_bo_evict_mm);
1313 int ttm_bo_init_mm(struct ttm_bo_device *bdev, unsigned type,
1314 unsigned long p_size)
1317 struct ttm_mem_type_manager *man;
1319 if (type >= TTM_NUM_MEM_TYPES) {
1320 printk(KERN_ERR TTM_PFX "Illegal memory type %d\n", type);
1324 man = &bdev->man[type];
1325 if (man->has_type) {
1326 printk(KERN_ERR TTM_PFX
1327 "Memory manager already initialized for type %d\n",
1332 ret = bdev->driver->init_mem_type(bdev, type, man);
1337 if (type != TTM_PL_SYSTEM) {
1339 printk(KERN_ERR TTM_PFX
1340 "Zero size memory manager type %d\n",
1344 ret = drm_mm_init(&man->manager, 0, p_size);
1348 man->has_type = true;
1349 man->use_type = true;
1352 INIT_LIST_HEAD(&man->lru);
1356 EXPORT_SYMBOL(ttm_bo_init_mm);
1358 static void ttm_bo_global_kobj_release(struct kobject *kobj)
1360 struct ttm_bo_global *glob =
1361 container_of(kobj, struct ttm_bo_global, kobj);
1363 ttm_mem_unregister_shrink(glob->mem_glob, &glob->shrink);
1364 __free_page(glob->dummy_read_page);
1368 void ttm_bo_global_release(struct ttm_global_reference *ref)
1370 struct ttm_bo_global *glob = ref->object;
1372 kobject_del(&glob->kobj);
1373 kobject_put(&glob->kobj);
1375 EXPORT_SYMBOL(ttm_bo_global_release);
1377 int ttm_bo_global_init(struct ttm_global_reference *ref)
1379 struct ttm_bo_global_ref *bo_ref =
1380 container_of(ref, struct ttm_bo_global_ref, ref);
1381 struct ttm_bo_global *glob = ref->object;
1384 mutex_init(&glob->device_list_mutex);
1385 spin_lock_init(&glob->lru_lock);
1386 glob->mem_glob = bo_ref->mem_glob;
1387 glob->dummy_read_page = alloc_page(__GFP_ZERO | GFP_DMA32);
1389 if (unlikely(glob->dummy_read_page == NULL)) {
1394 INIT_LIST_HEAD(&glob->swap_lru);
1395 INIT_LIST_HEAD(&glob->device_list);
1397 ttm_mem_init_shrink(&glob->shrink, ttm_bo_swapout);
1398 ret = ttm_mem_register_shrink(glob->mem_glob, &glob->shrink);
1399 if (unlikely(ret != 0)) {
1400 printk(KERN_ERR TTM_PFX
1401 "Could not register buffer object swapout.\n");
1405 glob->ttm_bo_extra_size =
1406 ttm_round_pot(sizeof(struct ttm_tt)) +
1407 ttm_round_pot(sizeof(struct ttm_backend));
1409 glob->ttm_bo_size = glob->ttm_bo_extra_size +
1410 ttm_round_pot(sizeof(struct ttm_buffer_object));
1412 atomic_set(&glob->bo_count, 0);
1414 kobject_init(&glob->kobj, &ttm_bo_glob_kobj_type);
1415 ret = kobject_add(&glob->kobj, ttm_get_kobj(), "buffer_objects");
1416 if (unlikely(ret != 0))
1417 kobject_put(&glob->kobj);
1420 __free_page(glob->dummy_read_page);
1425 EXPORT_SYMBOL(ttm_bo_global_init);
1428 int ttm_bo_device_release(struct ttm_bo_device *bdev)
1431 unsigned i = TTM_NUM_MEM_TYPES;
1432 struct ttm_mem_type_manager *man;
1433 struct ttm_bo_global *glob = bdev->glob;
1436 man = &bdev->man[i];
1437 if (man->has_type) {
1438 man->use_type = false;
1439 if ((i != TTM_PL_SYSTEM) && ttm_bo_clean_mm(bdev, i)) {
1441 printk(KERN_ERR TTM_PFX
1442 "DRM memory manager type %d "
1443 "is not clean.\n", i);
1445 man->has_type = false;
1449 mutex_lock(&glob->device_list_mutex);
1450 list_del(&bdev->device_list);
1451 mutex_unlock(&glob->device_list_mutex);
1453 if (!cancel_delayed_work(&bdev->wq))
1454 flush_scheduled_work();
1456 while (ttm_bo_delayed_delete(bdev, true))
1459 spin_lock(&glob->lru_lock);
1460 if (list_empty(&bdev->ddestroy))
1461 TTM_DEBUG("Delayed destroy list was clean\n");
1463 if (list_empty(&bdev->man[0].lru))
1464 TTM_DEBUG("Swap list was clean\n");
1465 spin_unlock(&glob->lru_lock);
1467 BUG_ON(!drm_mm_clean(&bdev->addr_space_mm));
1468 write_lock(&bdev->vm_lock);
1469 drm_mm_takedown(&bdev->addr_space_mm);
1470 write_unlock(&bdev->vm_lock);
1474 EXPORT_SYMBOL(ttm_bo_device_release);
1476 int ttm_bo_device_init(struct ttm_bo_device *bdev,
1477 struct ttm_bo_global *glob,
1478 struct ttm_bo_driver *driver,
1479 uint64_t file_page_offset,
1484 rwlock_init(&bdev->vm_lock);
1485 bdev->driver = driver;
1487 memset(bdev->man, 0, sizeof(bdev->man));
1490 * Initialize the system memory buffer type.
1491 * Other types need to be driver / IOCTL initialized.
1493 ret = ttm_bo_init_mm(bdev, TTM_PL_SYSTEM, 0);
1494 if (unlikely(ret != 0))
1497 bdev->addr_space_rb = RB_ROOT;
1498 ret = drm_mm_init(&bdev->addr_space_mm, file_page_offset, 0x10000000);
1499 if (unlikely(ret != 0))
1500 goto out_no_addr_mm;
1502 INIT_DELAYED_WORK(&bdev->wq, ttm_bo_delayed_workqueue);
1503 bdev->nice_mode = true;
1504 INIT_LIST_HEAD(&bdev->ddestroy);
1505 bdev->dev_mapping = NULL;
1507 bdev->need_dma32 = need_dma32;
1509 mutex_lock(&glob->device_list_mutex);
1510 list_add_tail(&bdev->device_list, &glob->device_list);
1511 mutex_unlock(&glob->device_list_mutex);
1515 ttm_bo_clean_mm(bdev, 0);
1519 EXPORT_SYMBOL(ttm_bo_device_init);
1522 * buffer object vm functions.
1525 bool ttm_mem_reg_is_pci(struct ttm_bo_device *bdev, struct ttm_mem_reg *mem)
1527 struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
1529 if (!(man->flags & TTM_MEMTYPE_FLAG_FIXED)) {
1530 if (mem->mem_type == TTM_PL_SYSTEM)
1533 if (man->flags & TTM_MEMTYPE_FLAG_CMA)
1536 if (mem->placement & TTM_PL_FLAG_CACHED)
1542 int ttm_bo_pci_offset(struct ttm_bo_device *bdev,
1543 struct ttm_mem_reg *mem,
1544 unsigned long *bus_base,
1545 unsigned long *bus_offset, unsigned long *bus_size)
1547 struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
1550 if (!(man->flags & TTM_MEMTYPE_FLAG_MAPPABLE))
1553 if (ttm_mem_reg_is_pci(bdev, mem)) {
1554 *bus_offset = mem->mm_node->start << PAGE_SHIFT;
1555 *bus_size = mem->num_pages << PAGE_SHIFT;
1556 *bus_base = man->io_offset;
1562 void ttm_bo_unmap_virtual(struct ttm_buffer_object *bo)
1564 struct ttm_bo_device *bdev = bo->bdev;
1565 loff_t offset = (loff_t) bo->addr_space_offset;
1566 loff_t holelen = ((loff_t) bo->mem.num_pages) << PAGE_SHIFT;
1568 if (!bdev->dev_mapping)
1571 unmap_mapping_range(bdev->dev_mapping, offset, holelen, 1);
1573 EXPORT_SYMBOL(ttm_bo_unmap_virtual);
1575 static void ttm_bo_vm_insert_rb(struct ttm_buffer_object *bo)
1577 struct ttm_bo_device *bdev = bo->bdev;
1578 struct rb_node **cur = &bdev->addr_space_rb.rb_node;
1579 struct rb_node *parent = NULL;
1580 struct ttm_buffer_object *cur_bo;
1581 unsigned long offset = bo->vm_node->start;
1582 unsigned long cur_offset;
1586 cur_bo = rb_entry(parent, struct ttm_buffer_object, vm_rb);
1587 cur_offset = cur_bo->vm_node->start;
1588 if (offset < cur_offset)
1589 cur = &parent->rb_left;
1590 else if (offset > cur_offset)
1591 cur = &parent->rb_right;
1596 rb_link_node(&bo->vm_rb, parent, cur);
1597 rb_insert_color(&bo->vm_rb, &bdev->addr_space_rb);
1603 * @bo: the buffer to allocate address space for
1605 * Allocate address space in the drm device so that applications
1606 * can mmap the buffer and access the contents. This only
1607 * applies to ttm_bo_type_device objects as others are not
1608 * placed in the drm device address space.
1611 static int ttm_bo_setup_vm(struct ttm_buffer_object *bo)
1613 struct ttm_bo_device *bdev = bo->bdev;
1617 ret = drm_mm_pre_get(&bdev->addr_space_mm);
1618 if (unlikely(ret != 0))
1621 write_lock(&bdev->vm_lock);
1622 bo->vm_node = drm_mm_search_free(&bdev->addr_space_mm,
1623 bo->mem.num_pages, 0, 0);
1625 if (unlikely(bo->vm_node == NULL)) {
1630 bo->vm_node = drm_mm_get_block_atomic(bo->vm_node,
1631 bo->mem.num_pages, 0);
1633 if (unlikely(bo->vm_node == NULL)) {
1634 write_unlock(&bdev->vm_lock);
1638 ttm_bo_vm_insert_rb(bo);
1639 write_unlock(&bdev->vm_lock);
1640 bo->addr_space_offset = ((uint64_t) bo->vm_node->start) << PAGE_SHIFT;
1644 write_unlock(&bdev->vm_lock);
1648 int ttm_bo_wait(struct ttm_buffer_object *bo,
1649 bool lazy, bool interruptible, bool no_wait)
1651 struct ttm_bo_driver *driver = bo->bdev->driver;
1656 if (likely(bo->sync_obj == NULL))
1659 while (bo->sync_obj) {
1661 if (driver->sync_obj_signaled(bo->sync_obj, bo->sync_obj_arg)) {
1662 void *tmp_obj = bo->sync_obj;
1663 bo->sync_obj = NULL;
1664 clear_bit(TTM_BO_PRIV_FLAG_MOVING, &bo->priv_flags);
1665 spin_unlock(&bo->lock);
1666 driver->sync_obj_unref(&tmp_obj);
1667 spin_lock(&bo->lock);
1674 sync_obj = driver->sync_obj_ref(bo->sync_obj);
1675 sync_obj_arg = bo->sync_obj_arg;
1676 spin_unlock(&bo->lock);
1677 ret = driver->sync_obj_wait(sync_obj, sync_obj_arg,
1678 lazy, interruptible);
1679 if (unlikely(ret != 0)) {
1680 driver->sync_obj_unref(&sync_obj);
1681 spin_lock(&bo->lock);
1684 spin_lock(&bo->lock);
1685 if (likely(bo->sync_obj == sync_obj &&
1686 bo->sync_obj_arg == sync_obj_arg)) {
1687 void *tmp_obj = bo->sync_obj;
1688 bo->sync_obj = NULL;
1689 clear_bit(TTM_BO_PRIV_FLAG_MOVING,
1691 spin_unlock(&bo->lock);
1692 driver->sync_obj_unref(&sync_obj);
1693 driver->sync_obj_unref(&tmp_obj);
1694 spin_lock(&bo->lock);
1696 spin_unlock(&bo->lock);
1697 driver->sync_obj_unref(&sync_obj);
1698 spin_lock(&bo->lock);
1703 EXPORT_SYMBOL(ttm_bo_wait);
1705 void ttm_bo_unblock_reservation(struct ttm_buffer_object *bo)
1707 atomic_set(&bo->reserved, 0);
1708 wake_up_all(&bo->event_queue);
1711 int ttm_bo_block_reservation(struct ttm_buffer_object *bo, bool interruptible,
1716 while (unlikely(atomic_cmpxchg(&bo->reserved, 0, 1) != 0)) {
1719 else if (interruptible) {
1720 ret = wait_event_interruptible
1721 (bo->event_queue, atomic_read(&bo->reserved) == 0);
1722 if (unlikely(ret != 0))
1725 wait_event(bo->event_queue,
1726 atomic_read(&bo->reserved) == 0);
1732 int ttm_bo_synccpu_write_grab(struct ttm_buffer_object *bo, bool no_wait)
1737 * Using ttm_bo_reserve instead of ttm_bo_block_reservation
1738 * makes sure the lru lists are updated.
1741 ret = ttm_bo_reserve(bo, true, no_wait, false, 0);
1742 if (unlikely(ret != 0))
1744 spin_lock(&bo->lock);
1745 ret = ttm_bo_wait(bo, false, true, no_wait);
1746 spin_unlock(&bo->lock);
1747 if (likely(ret == 0))
1748 atomic_inc(&bo->cpu_writers);
1749 ttm_bo_unreserve(bo);
1752 EXPORT_SYMBOL(ttm_bo_synccpu_write_grab);
1754 void ttm_bo_synccpu_write_release(struct ttm_buffer_object *bo)
1756 if (atomic_dec_and_test(&bo->cpu_writers))
1757 wake_up_all(&bo->event_queue);
1759 EXPORT_SYMBOL(ttm_bo_synccpu_write_release);
1762 * A buffer object shrink method that tries to swap out the first
1763 * buffer object on the bo_global::swap_lru list.
1766 static int ttm_bo_swapout(struct ttm_mem_shrink *shrink)
1768 struct ttm_bo_global *glob =
1769 container_of(shrink, struct ttm_bo_global, shrink);
1770 struct ttm_buffer_object *bo;
1773 uint32_t swap_placement = (TTM_PL_FLAG_CACHED | TTM_PL_FLAG_SYSTEM);
1775 spin_lock(&glob->lru_lock);
1776 while (ret == -EBUSY) {
1777 if (unlikely(list_empty(&glob->swap_lru))) {
1778 spin_unlock(&glob->lru_lock);
1782 bo = list_first_entry(&glob->swap_lru,
1783 struct ttm_buffer_object, swap);
1784 kref_get(&bo->list_kref);
1787 * Reserve buffer. Since we unlock while sleeping, we need
1788 * to re-check that nobody removed us from the swap-list while
1792 ret = ttm_bo_reserve_locked(bo, false, true, false, 0);
1793 if (unlikely(ret == -EBUSY)) {
1794 spin_unlock(&glob->lru_lock);
1795 ttm_bo_wait_unreserved(bo, false);
1796 kref_put(&bo->list_kref, ttm_bo_release_list);
1797 spin_lock(&glob->lru_lock);
1802 put_count = ttm_bo_del_from_lru(bo);
1803 spin_unlock(&glob->lru_lock);
1806 kref_put(&bo->list_kref, ttm_bo_ref_bug);
1809 * Wait for GPU, then move to system cached.
1812 spin_lock(&bo->lock);
1813 ret = ttm_bo_wait(bo, false, false, false);
1814 spin_unlock(&bo->lock);
1816 if (unlikely(ret != 0))
1819 if ((bo->mem.placement & swap_placement) != swap_placement) {
1820 struct ttm_mem_reg evict_mem;
1822 evict_mem = bo->mem;
1823 evict_mem.mm_node = NULL;
1824 evict_mem.placement = TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED;
1825 evict_mem.mem_type = TTM_PL_SYSTEM;
1827 ret = ttm_bo_handle_move_mem(bo, &evict_mem, true,
1829 if (unlikely(ret != 0))
1833 ttm_bo_unmap_virtual(bo);
1836 * Swap out. Buffer will be swapped in again as soon as
1837 * anyone tries to access a ttm page.
1840 if (bo->bdev->driver->swap_notify)
1841 bo->bdev->driver->swap_notify(bo);
1843 ret = ttm_tt_swapout(bo->ttm, bo->persistant_swap_storage);
1848 * Unreserve without putting on LRU to avoid swapping out an
1849 * already swapped buffer.
1852 atomic_set(&bo->reserved, 0);
1853 wake_up_all(&bo->event_queue);
1854 kref_put(&bo->list_kref, ttm_bo_release_list);
1858 void ttm_bo_swapout_all(struct ttm_bo_device *bdev)
1860 while (ttm_bo_swapout(&bdev->glob->shrink) == 0)
1863 EXPORT_SYMBOL(ttm_bo_swapout_all);