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)) {
227 if (use_sequence && bo->seq_valid &&
228 (sequence - bo->val_seq < (1 << 31))) {
235 spin_unlock(&glob->lru_lock);
236 ret = ttm_bo_wait_unreserved(bo, interruptible);
237 spin_lock(&glob->lru_lock);
244 bo->val_seq = sequence;
245 bo->seq_valid = true;
247 bo->seq_valid = false;
252 EXPORT_SYMBOL(ttm_bo_reserve);
254 static void ttm_bo_ref_bug(struct kref *list_kref)
259 int ttm_bo_reserve(struct ttm_buffer_object *bo,
261 bool no_wait, bool use_sequence, uint32_t sequence)
263 struct ttm_bo_global *glob = bo->glob;
267 spin_lock(&glob->lru_lock);
268 ret = ttm_bo_reserve_locked(bo, interruptible, no_wait, use_sequence,
270 if (likely(ret == 0))
271 put_count = ttm_bo_del_from_lru(bo);
272 spin_unlock(&glob->lru_lock);
275 kref_put(&bo->list_kref, ttm_bo_ref_bug);
280 void ttm_bo_unreserve(struct ttm_buffer_object *bo)
282 struct ttm_bo_global *glob = bo->glob;
284 spin_lock(&glob->lru_lock);
285 ttm_bo_add_to_lru(bo);
286 atomic_set(&bo->reserved, 0);
287 wake_up_all(&bo->event_queue);
288 spin_unlock(&glob->lru_lock);
290 EXPORT_SYMBOL(ttm_bo_unreserve);
293 * Call bo->mutex locked.
295 static int ttm_bo_add_ttm(struct ttm_buffer_object *bo, bool zero_alloc)
297 struct ttm_bo_device *bdev = bo->bdev;
298 struct ttm_bo_global *glob = bo->glob;
300 uint32_t page_flags = 0;
302 TTM_ASSERT_LOCKED(&bo->mutex);
305 if (bdev->need_dma32)
306 page_flags |= TTM_PAGE_FLAG_DMA32;
309 case ttm_bo_type_device:
311 page_flags |= TTM_PAGE_FLAG_ZERO_ALLOC;
312 case ttm_bo_type_kernel:
313 bo->ttm = ttm_tt_create(bdev, bo->num_pages << PAGE_SHIFT,
314 page_flags, glob->dummy_read_page);
315 if (unlikely(bo->ttm == NULL))
318 case ttm_bo_type_user:
319 bo->ttm = ttm_tt_create(bdev, bo->num_pages << PAGE_SHIFT,
320 page_flags | TTM_PAGE_FLAG_USER,
321 glob->dummy_read_page);
322 if (unlikely(bo->ttm == NULL)) {
327 ret = ttm_tt_set_user(bo->ttm, current,
328 bo->buffer_start, bo->num_pages);
329 if (unlikely(ret != 0))
330 ttm_tt_destroy(bo->ttm);
333 printk(KERN_ERR TTM_PFX "Illegal buffer object type\n");
341 static int ttm_bo_handle_move_mem(struct ttm_buffer_object *bo,
342 struct ttm_mem_reg *mem,
343 bool evict, bool interruptible,
344 bool no_wait_reserve, bool no_wait_gpu)
346 struct ttm_bo_device *bdev = bo->bdev;
347 bool old_is_pci = ttm_mem_reg_is_pci(bdev, &bo->mem);
348 bool new_is_pci = ttm_mem_reg_is_pci(bdev, mem);
349 struct ttm_mem_type_manager *old_man = &bdev->man[bo->mem.mem_type];
350 struct ttm_mem_type_manager *new_man = &bdev->man[mem->mem_type];
353 if (old_is_pci || new_is_pci ||
354 ((mem->placement & bo->mem.placement & TTM_PL_MASK_CACHING) == 0))
355 ttm_bo_unmap_virtual(bo);
358 * Create and bind a ttm if required.
361 if (!(new_man->flags & TTM_MEMTYPE_FLAG_FIXED) && (bo->ttm == NULL)) {
362 ret = ttm_bo_add_ttm(bo, false);
366 ret = ttm_tt_set_placement_caching(bo->ttm, mem->placement);
370 if (mem->mem_type != TTM_PL_SYSTEM) {
371 ret = ttm_tt_bind(bo->ttm, mem);
376 if (bo->mem.mem_type == TTM_PL_SYSTEM) {
384 if (bdev->driver->move_notify)
385 bdev->driver->move_notify(bo, mem);
387 if (!(old_man->flags & TTM_MEMTYPE_FLAG_FIXED) &&
388 !(new_man->flags & TTM_MEMTYPE_FLAG_FIXED))
389 ret = ttm_bo_move_ttm(bo, evict, no_wait_reserve, no_wait_gpu, mem);
390 else if (bdev->driver->move)
391 ret = bdev->driver->move(bo, evict, interruptible,
392 no_wait_reserve, no_wait_gpu, mem);
394 ret = ttm_bo_move_memcpy(bo, evict, no_wait_reserve, no_wait_gpu, mem);
401 ret = bdev->driver->invalidate_caches(bdev, bo->mem.placement);
403 printk(KERN_ERR TTM_PFX "Can not flush read caches\n");
407 if (bo->mem.mm_node) {
408 spin_lock(&bo->lock);
409 bo->offset = (bo->mem.start << PAGE_SHIFT) +
410 bdev->man[bo->mem.mem_type].gpu_offset;
411 bo->cur_placement = bo->mem.placement;
412 spin_unlock(&bo->lock);
419 new_man = &bdev->man[bo->mem.mem_type];
420 if ((new_man->flags & TTM_MEMTYPE_FLAG_FIXED) && bo->ttm) {
421 ttm_tt_unbind(bo->ttm);
422 ttm_tt_destroy(bo->ttm);
431 * Will release GPU memory type usage on destruction.
432 * This is the place to put in driver specific hooks to release
433 * driver private resources.
434 * Will release the bo::reserved lock.
437 static void ttm_bo_cleanup_memtype_use(struct ttm_buffer_object *bo)
440 ttm_tt_unbind(bo->ttm);
441 ttm_tt_destroy(bo->ttm);
445 ttm_bo_mem_put(bo, &bo->mem);
447 atomic_set(&bo->reserved, 0);
450 * Make processes trying to reserve really pick it up.
452 smp_mb__after_atomic_dec();
453 wake_up_all(&bo->event_queue);
456 static void ttm_bo_cleanup_refs_or_queue(struct ttm_buffer_object *bo)
458 struct ttm_bo_device *bdev = bo->bdev;
459 struct ttm_bo_global *glob = bo->glob;
460 struct ttm_bo_driver *driver;
461 void *sync_obj = NULL;
466 spin_lock(&bo->lock);
467 (void) ttm_bo_wait(bo, false, false, true);
470 spin_lock(&glob->lru_lock);
473 * Lock inversion between bo::reserve and bo::lock here,
474 * but that's OK, since we're only trylocking.
477 ret = ttm_bo_reserve_locked(bo, false, true, false, 0);
479 if (unlikely(ret == -EBUSY))
482 spin_unlock(&bo->lock);
483 put_count = ttm_bo_del_from_lru(bo);
485 spin_unlock(&glob->lru_lock);
486 ttm_bo_cleanup_memtype_use(bo);
489 kref_put(&bo->list_kref, ttm_bo_ref_bug);
493 spin_lock(&glob->lru_lock);
496 driver = bdev->driver;
498 sync_obj = driver->sync_obj_ref(bo->sync_obj);
499 sync_obj_arg = bo->sync_obj_arg;
501 kref_get(&bo->list_kref);
502 list_add_tail(&bo->ddestroy, &bdev->ddestroy);
503 spin_unlock(&glob->lru_lock);
504 spin_unlock(&bo->lock);
507 driver->sync_obj_flush(sync_obj, sync_obj_arg);
508 driver->sync_obj_unref(&sync_obj);
510 schedule_delayed_work(&bdev->wq,
511 ((HZ / 100) < 1) ? 1 : HZ / 100);
515 * function ttm_bo_cleanup_refs
516 * If bo idle, remove from delayed- and lru lists, and unref.
517 * If not idle, do nothing.
519 * @interruptible Any sleeps should occur interruptibly.
520 * @no_wait_reserve Never wait for reserve. Return -EBUSY instead.
521 * @no_wait_gpu Never wait for gpu. Return -EBUSY instead.
524 static int ttm_bo_cleanup_refs(struct ttm_buffer_object *bo,
526 bool no_wait_reserve,
529 struct ttm_bo_global *glob = bo->glob;
534 spin_lock(&bo->lock);
535 ret = ttm_bo_wait(bo, false, interruptible, no_wait_gpu);
536 spin_unlock(&bo->lock);
538 if (unlikely(ret != 0))
541 spin_lock(&glob->lru_lock);
542 ret = ttm_bo_reserve_locked(bo, interruptible,
543 no_wait_reserve, false, 0);
545 if (unlikely(ret != 0) || list_empty(&bo->ddestroy)) {
546 spin_unlock(&glob->lru_lock);
551 * We can re-check for sync object without taking
552 * the bo::lock since setting the sync object requires
553 * also bo::reserved. A busy object at this point may
554 * be caused by another thread recently starting an accelerated
558 if (unlikely(bo->sync_obj)) {
559 atomic_set(&bo->reserved, 0);
560 wake_up_all(&bo->event_queue);
561 spin_unlock(&glob->lru_lock);
565 put_count = ttm_bo_del_from_lru(bo);
566 list_del_init(&bo->ddestroy);
569 spin_unlock(&glob->lru_lock);
570 ttm_bo_cleanup_memtype_use(bo);
573 kref_put(&bo->list_kref, ttm_bo_ref_bug);
579 * Traverse the delayed list, and call ttm_bo_cleanup_refs on all
580 * encountered buffers.
583 static int ttm_bo_delayed_delete(struct ttm_bo_device *bdev, bool remove_all)
585 struct ttm_bo_global *glob = bdev->glob;
586 struct ttm_buffer_object *entry = NULL;
589 spin_lock(&glob->lru_lock);
590 if (list_empty(&bdev->ddestroy))
593 entry = list_first_entry(&bdev->ddestroy,
594 struct ttm_buffer_object, ddestroy);
595 kref_get(&entry->list_kref);
598 struct ttm_buffer_object *nentry = NULL;
600 if (entry->ddestroy.next != &bdev->ddestroy) {
601 nentry = list_first_entry(&entry->ddestroy,
602 struct ttm_buffer_object, ddestroy);
603 kref_get(&nentry->list_kref);
606 spin_unlock(&glob->lru_lock);
607 ret = ttm_bo_cleanup_refs(entry, false, !remove_all,
609 kref_put(&entry->list_kref, ttm_bo_release_list);
615 spin_lock(&glob->lru_lock);
616 if (list_empty(&entry->ddestroy))
621 spin_unlock(&glob->lru_lock);
624 kref_put(&entry->list_kref, ttm_bo_release_list);
628 static void ttm_bo_delayed_workqueue(struct work_struct *work)
630 struct ttm_bo_device *bdev =
631 container_of(work, struct ttm_bo_device, wq.work);
633 if (ttm_bo_delayed_delete(bdev, false)) {
634 schedule_delayed_work(&bdev->wq,
635 ((HZ / 100) < 1) ? 1 : HZ / 100);
639 static void ttm_bo_release(struct kref *kref)
641 struct ttm_buffer_object *bo =
642 container_of(kref, struct ttm_buffer_object, kref);
643 struct ttm_bo_device *bdev = bo->bdev;
645 if (likely(bo->vm_node != NULL)) {
646 rb_erase(&bo->vm_rb, &bdev->addr_space_rb);
647 drm_mm_put_block(bo->vm_node);
650 write_unlock(&bdev->vm_lock);
651 ttm_bo_cleanup_refs_or_queue(bo);
652 kref_put(&bo->list_kref, ttm_bo_release_list);
653 write_lock(&bdev->vm_lock);
656 void ttm_bo_unref(struct ttm_buffer_object **p_bo)
658 struct ttm_buffer_object *bo = *p_bo;
659 struct ttm_bo_device *bdev = bo->bdev;
662 write_lock(&bdev->vm_lock);
663 kref_put(&bo->kref, ttm_bo_release);
664 write_unlock(&bdev->vm_lock);
666 EXPORT_SYMBOL(ttm_bo_unref);
668 int ttm_bo_lock_delayed_workqueue(struct ttm_bo_device *bdev)
670 return cancel_delayed_work_sync(&bdev->wq);
672 EXPORT_SYMBOL(ttm_bo_lock_delayed_workqueue);
674 void ttm_bo_unlock_delayed_workqueue(struct ttm_bo_device *bdev, int resched)
677 schedule_delayed_work(&bdev->wq,
678 ((HZ / 100) < 1) ? 1 : HZ / 100);
680 EXPORT_SYMBOL(ttm_bo_unlock_delayed_workqueue);
682 static int ttm_bo_evict(struct ttm_buffer_object *bo, bool interruptible,
683 bool no_wait_reserve, bool no_wait_gpu)
685 struct ttm_bo_device *bdev = bo->bdev;
686 struct ttm_mem_reg evict_mem;
687 struct ttm_placement placement;
690 spin_lock(&bo->lock);
691 ret = ttm_bo_wait(bo, false, interruptible, no_wait_gpu);
692 spin_unlock(&bo->lock);
694 if (unlikely(ret != 0)) {
695 if (ret != -ERESTARTSYS) {
696 printk(KERN_ERR TTM_PFX
697 "Failed to expire sync object before "
698 "buffer eviction.\n");
703 BUG_ON(!atomic_read(&bo->reserved));
706 evict_mem.mm_node = NULL;
707 evict_mem.bus.io_reserved = false;
711 placement.num_placement = 0;
712 placement.num_busy_placement = 0;
713 bdev->driver->evict_flags(bo, &placement);
714 ret = ttm_bo_mem_space(bo, &placement, &evict_mem, interruptible,
715 no_wait_reserve, no_wait_gpu);
717 if (ret != -ERESTARTSYS) {
718 printk(KERN_ERR TTM_PFX
719 "Failed to find memory space for "
720 "buffer 0x%p eviction.\n", bo);
721 ttm_bo_mem_space_debug(bo, &placement);
726 ret = ttm_bo_handle_move_mem(bo, &evict_mem, true, interruptible,
727 no_wait_reserve, no_wait_gpu);
729 if (ret != -ERESTARTSYS)
730 printk(KERN_ERR TTM_PFX "Buffer eviction failed\n");
731 ttm_bo_mem_put(bo, &evict_mem);
739 static int ttm_mem_evict_first(struct ttm_bo_device *bdev,
741 bool interruptible, bool no_wait_reserve,
744 struct ttm_bo_global *glob = bdev->glob;
745 struct ttm_mem_type_manager *man = &bdev->man[mem_type];
746 struct ttm_buffer_object *bo;
747 int ret, put_count = 0;
750 spin_lock(&glob->lru_lock);
751 if (list_empty(&man->lru)) {
752 spin_unlock(&glob->lru_lock);
756 bo = list_first_entry(&man->lru, struct ttm_buffer_object, lru);
757 kref_get(&bo->list_kref);
759 if (!list_empty(&bo->ddestroy)) {
760 spin_unlock(&glob->lru_lock);
761 ret = ttm_bo_cleanup_refs(bo, interruptible,
762 no_wait_reserve, no_wait_gpu);
763 kref_put(&bo->list_kref, ttm_bo_release_list);
765 if (likely(ret == 0 || ret == -ERESTARTSYS))
771 ret = ttm_bo_reserve_locked(bo, false, no_wait_reserve, false, 0);
773 if (unlikely(ret == -EBUSY)) {
774 spin_unlock(&glob->lru_lock);
775 if (likely(!no_wait_gpu))
776 ret = ttm_bo_wait_unreserved(bo, interruptible);
778 kref_put(&bo->list_kref, ttm_bo_release_list);
781 * We *need* to retry after releasing the lru lock.
784 if (unlikely(ret != 0))
789 put_count = ttm_bo_del_from_lru(bo);
790 spin_unlock(&glob->lru_lock);
795 kref_put(&bo->list_kref, ttm_bo_ref_bug);
797 ret = ttm_bo_evict(bo, interruptible, no_wait_reserve, no_wait_gpu);
798 ttm_bo_unreserve(bo);
800 kref_put(&bo->list_kref, ttm_bo_release_list);
804 void ttm_bo_mem_put(struct ttm_buffer_object *bo, struct ttm_mem_reg *mem)
806 struct ttm_mem_type_manager *man = &bo->bdev->man[mem->mem_type];
809 (*man->func->put_node)(man, mem);
811 EXPORT_SYMBOL(ttm_bo_mem_put);
814 * Repeatedly evict memory from the LRU for @mem_type until we create enough
815 * space, or we've evicted everything and there isn't enough space.
817 static int ttm_bo_mem_force_space(struct ttm_buffer_object *bo,
819 struct ttm_placement *placement,
820 struct ttm_mem_reg *mem,
822 bool no_wait_reserve,
825 struct ttm_bo_device *bdev = bo->bdev;
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 ret = ttm_mem_evict_first(bdev, mem_type, interruptible,
836 no_wait_reserve, no_wait_gpu);
837 if (unlikely(ret != 0))
840 if (mem->mm_node == NULL)
842 mem->mem_type = mem_type;
846 static uint32_t ttm_bo_select_caching(struct ttm_mem_type_manager *man,
847 uint32_t cur_placement,
848 uint32_t proposed_placement)
850 uint32_t caching = proposed_placement & TTM_PL_MASK_CACHING;
851 uint32_t result = proposed_placement & ~TTM_PL_MASK_CACHING;
854 * Keep current caching if possible.
857 if ((cur_placement & caching) != 0)
858 result |= (cur_placement & caching);
859 else if ((man->default_caching & caching) != 0)
860 result |= man->default_caching;
861 else if ((TTM_PL_FLAG_CACHED & caching) != 0)
862 result |= TTM_PL_FLAG_CACHED;
863 else if ((TTM_PL_FLAG_WC & caching) != 0)
864 result |= TTM_PL_FLAG_WC;
865 else if ((TTM_PL_FLAG_UNCACHED & caching) != 0)
866 result |= TTM_PL_FLAG_UNCACHED;
871 static bool ttm_bo_mt_compatible(struct ttm_mem_type_manager *man,
874 uint32_t proposed_placement,
875 uint32_t *masked_placement)
877 uint32_t cur_flags = ttm_bo_type_flags(mem_type);
879 if ((man->flags & TTM_MEMTYPE_FLAG_FIXED) && disallow_fixed)
882 if ((cur_flags & proposed_placement & TTM_PL_MASK_MEM) == 0)
885 if ((proposed_placement & man->available_caching) == 0)
888 cur_flags |= (proposed_placement & man->available_caching);
890 *masked_placement = cur_flags;
895 * Creates space for memory region @mem according to its type.
897 * This function first searches for free space in compatible memory types in
898 * the priority order defined by the driver. If free space isn't found, then
899 * ttm_bo_mem_force_space is attempted in priority order to evict and find
902 int ttm_bo_mem_space(struct ttm_buffer_object *bo,
903 struct ttm_placement *placement,
904 struct ttm_mem_reg *mem,
905 bool interruptible, bool no_wait_reserve,
908 struct ttm_bo_device *bdev = bo->bdev;
909 struct ttm_mem_type_manager *man;
910 uint32_t mem_type = TTM_PL_SYSTEM;
911 uint32_t cur_flags = 0;
912 bool type_found = false;
913 bool type_ok = false;
914 bool has_erestartsys = false;
918 for (i = 0; i < placement->num_placement; ++i) {
919 ret = ttm_mem_type_from_flags(placement->placement[i],
923 man = &bdev->man[mem_type];
925 type_ok = ttm_bo_mt_compatible(man,
926 bo->type == ttm_bo_type_user,
928 placement->placement[i],
934 cur_flags = ttm_bo_select_caching(man, bo->mem.placement,
937 * Use the access and other non-mapping-related flag bits from
938 * the memory placement flags to the current flags
940 ttm_flag_masked(&cur_flags, placement->placement[i],
941 ~TTM_PL_MASK_MEMTYPE);
943 if (mem_type == TTM_PL_SYSTEM)
946 if (man->has_type && man->use_type) {
948 ret = (*man->func->get_node)(man, bo, placement, mem);
956 if ((type_ok && (mem_type == TTM_PL_SYSTEM)) || mem->mm_node) {
957 mem->mem_type = mem_type;
958 mem->placement = cur_flags;
965 for (i = 0; i < placement->num_busy_placement; ++i) {
966 ret = ttm_mem_type_from_flags(placement->busy_placement[i],
970 man = &bdev->man[mem_type];
973 if (!ttm_bo_mt_compatible(man,
974 bo->type == ttm_bo_type_user,
976 placement->busy_placement[i],
980 cur_flags = ttm_bo_select_caching(man, bo->mem.placement,
983 * Use the access and other non-mapping-related flag bits from
984 * the memory placement flags to the current flags
986 ttm_flag_masked(&cur_flags, placement->busy_placement[i],
987 ~TTM_PL_MASK_MEMTYPE);
990 if (mem_type == TTM_PL_SYSTEM) {
991 mem->mem_type = mem_type;
992 mem->placement = cur_flags;
997 ret = ttm_bo_mem_force_space(bo, mem_type, placement, mem,
998 interruptible, no_wait_reserve, no_wait_gpu);
999 if (ret == 0 && mem->mm_node) {
1000 mem->placement = cur_flags;
1003 if (ret == -ERESTARTSYS)
1004 has_erestartsys = true;
1006 ret = (has_erestartsys) ? -ERESTARTSYS : -ENOMEM;
1009 EXPORT_SYMBOL(ttm_bo_mem_space);
1011 int ttm_bo_wait_cpu(struct ttm_buffer_object *bo, bool no_wait)
1013 if ((atomic_read(&bo->cpu_writers) > 0) && no_wait)
1016 return wait_event_interruptible(bo->event_queue,
1017 atomic_read(&bo->cpu_writers) == 0);
1019 EXPORT_SYMBOL(ttm_bo_wait_cpu);
1021 int ttm_bo_move_buffer(struct ttm_buffer_object *bo,
1022 struct ttm_placement *placement,
1023 bool interruptible, bool no_wait_reserve,
1027 struct ttm_mem_reg mem;
1029 BUG_ON(!atomic_read(&bo->reserved));
1032 * FIXME: It's possible to pipeline buffer moves.
1033 * Have the driver move function wait for idle when necessary,
1034 * instead of doing it here.
1036 spin_lock(&bo->lock);
1037 ret = ttm_bo_wait(bo, false, interruptible, no_wait_gpu);
1038 spin_unlock(&bo->lock);
1041 mem.num_pages = bo->num_pages;
1042 mem.size = mem.num_pages << PAGE_SHIFT;
1043 mem.page_alignment = bo->mem.page_alignment;
1044 mem.bus.io_reserved = false;
1046 * Determine where to move the buffer.
1048 ret = ttm_bo_mem_space(bo, placement, &mem, interruptible, no_wait_reserve, no_wait_gpu);
1051 ret = ttm_bo_handle_move_mem(bo, &mem, false, interruptible, no_wait_reserve, no_wait_gpu);
1053 if (ret && mem.mm_node)
1054 ttm_bo_mem_put(bo, &mem);
1058 static int ttm_bo_mem_compat(struct ttm_placement *placement,
1059 struct ttm_mem_reg *mem)
1063 if (mem->mm_node && placement->lpfn != 0 &&
1064 (mem->start < placement->fpfn ||
1065 mem->start + mem->num_pages > placement->lpfn))
1068 for (i = 0; i < placement->num_placement; i++) {
1069 if ((placement->placement[i] & mem->placement &
1070 TTM_PL_MASK_CACHING) &&
1071 (placement->placement[i] & mem->placement &
1078 int ttm_bo_validate(struct ttm_buffer_object *bo,
1079 struct ttm_placement *placement,
1080 bool interruptible, bool no_wait_reserve,
1085 BUG_ON(!atomic_read(&bo->reserved));
1086 /* Check that range is valid */
1087 if (placement->lpfn || placement->fpfn)
1088 if (placement->fpfn > placement->lpfn ||
1089 (placement->lpfn - placement->fpfn) < bo->num_pages)
1092 * Check whether we need to move buffer.
1094 ret = ttm_bo_mem_compat(placement, &bo->mem);
1096 ret = ttm_bo_move_buffer(bo, placement, interruptible, no_wait_reserve, no_wait_gpu);
1101 * Use the access and other non-mapping-related flag bits from
1102 * the compatible memory placement flags to the active flags
1104 ttm_flag_masked(&bo->mem.placement, placement->placement[ret],
1105 ~TTM_PL_MASK_MEMTYPE);
1108 * We might need to add a TTM.
1110 if (bo->mem.mem_type == TTM_PL_SYSTEM && bo->ttm == NULL) {
1111 ret = ttm_bo_add_ttm(bo, true);
1117 EXPORT_SYMBOL(ttm_bo_validate);
1119 int ttm_bo_check_placement(struct ttm_buffer_object *bo,
1120 struct ttm_placement *placement)
1124 if (placement->fpfn || placement->lpfn) {
1125 if (bo->mem.num_pages > (placement->lpfn - placement->fpfn)) {
1126 printk(KERN_ERR TTM_PFX "Page number range to small "
1127 "Need %lu pages, range is [%u, %u]\n",
1128 bo->mem.num_pages, placement->fpfn,
1133 for (i = 0; i < placement->num_placement; i++) {
1134 if (!capable(CAP_SYS_ADMIN)) {
1135 if (placement->placement[i] & TTM_PL_FLAG_NO_EVICT) {
1136 printk(KERN_ERR TTM_PFX "Need to be root to "
1137 "modify NO_EVICT status.\n");
1142 for (i = 0; i < placement->num_busy_placement; i++) {
1143 if (!capable(CAP_SYS_ADMIN)) {
1144 if (placement->busy_placement[i] & TTM_PL_FLAG_NO_EVICT) {
1145 printk(KERN_ERR TTM_PFX "Need to be root to "
1146 "modify NO_EVICT status.\n");
1154 int ttm_bo_init(struct ttm_bo_device *bdev,
1155 struct ttm_buffer_object *bo,
1157 enum ttm_bo_type type,
1158 struct ttm_placement *placement,
1159 uint32_t page_alignment,
1160 unsigned long buffer_start,
1162 struct file *persistant_swap_storage,
1164 void (*destroy) (struct ttm_buffer_object *))
1167 unsigned long num_pages;
1169 size += buffer_start & ~PAGE_MASK;
1170 num_pages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
1171 if (num_pages == 0) {
1172 printk(KERN_ERR TTM_PFX "Illegal buffer object size.\n");
1175 bo->destroy = destroy;
1177 spin_lock_init(&bo->lock);
1178 kref_init(&bo->kref);
1179 kref_init(&bo->list_kref);
1180 atomic_set(&bo->cpu_writers, 0);
1181 atomic_set(&bo->reserved, 1);
1182 init_waitqueue_head(&bo->event_queue);
1183 INIT_LIST_HEAD(&bo->lru);
1184 INIT_LIST_HEAD(&bo->ddestroy);
1185 INIT_LIST_HEAD(&bo->swap);
1187 bo->glob = bdev->glob;
1189 bo->num_pages = num_pages;
1190 bo->mem.size = num_pages << PAGE_SHIFT;
1191 bo->mem.mem_type = TTM_PL_SYSTEM;
1192 bo->mem.num_pages = bo->num_pages;
1193 bo->mem.mm_node = NULL;
1194 bo->mem.page_alignment = page_alignment;
1195 bo->mem.bus.io_reserved = false;
1196 bo->buffer_start = buffer_start & PAGE_MASK;
1198 bo->mem.placement = (TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED);
1199 bo->seq_valid = false;
1200 bo->persistant_swap_storage = persistant_swap_storage;
1201 bo->acc_size = acc_size;
1202 atomic_inc(&bo->glob->bo_count);
1204 ret = ttm_bo_check_placement(bo, placement);
1205 if (unlikely(ret != 0))
1209 * For ttm_bo_type_device buffers, allocate
1210 * address space from the device.
1212 if (bo->type == ttm_bo_type_device) {
1213 ret = ttm_bo_setup_vm(bo);
1218 ret = ttm_bo_validate(bo, placement, interruptible, false, false);
1222 ttm_bo_unreserve(bo);
1226 ttm_bo_unreserve(bo);
1231 EXPORT_SYMBOL(ttm_bo_init);
1233 static inline size_t ttm_bo_size(struct ttm_bo_global *glob,
1234 unsigned long num_pages)
1236 size_t page_array_size = (num_pages * sizeof(void *) + PAGE_SIZE - 1) &
1239 return glob->ttm_bo_size + 2 * page_array_size;
1242 int ttm_bo_create(struct ttm_bo_device *bdev,
1244 enum ttm_bo_type type,
1245 struct ttm_placement *placement,
1246 uint32_t page_alignment,
1247 unsigned long buffer_start,
1249 struct file *persistant_swap_storage,
1250 struct ttm_buffer_object **p_bo)
1252 struct ttm_buffer_object *bo;
1253 struct ttm_mem_global *mem_glob = bdev->glob->mem_glob;
1257 ttm_bo_size(bdev->glob, (size + PAGE_SIZE - 1) >> PAGE_SHIFT);
1258 ret = ttm_mem_global_alloc(mem_glob, acc_size, false, false);
1259 if (unlikely(ret != 0))
1262 bo = kzalloc(sizeof(*bo), GFP_KERNEL);
1264 if (unlikely(bo == NULL)) {
1265 ttm_mem_global_free(mem_glob, acc_size);
1269 ret = ttm_bo_init(bdev, bo, size, type, placement, page_alignment,
1270 buffer_start, interruptible,
1271 persistant_swap_storage, acc_size, NULL);
1272 if (likely(ret == 0))
1278 static int ttm_bo_force_list_clean(struct ttm_bo_device *bdev,
1279 unsigned mem_type, bool allow_errors)
1281 struct ttm_mem_type_manager *man = &bdev->man[mem_type];
1282 struct ttm_bo_global *glob = bdev->glob;
1286 * Can't use standard list traversal since we're unlocking.
1289 spin_lock(&glob->lru_lock);
1290 while (!list_empty(&man->lru)) {
1291 spin_unlock(&glob->lru_lock);
1292 ret = ttm_mem_evict_first(bdev, mem_type, false, false, false);
1297 printk(KERN_ERR TTM_PFX
1298 "Cleanup eviction failed\n");
1301 spin_lock(&glob->lru_lock);
1303 spin_unlock(&glob->lru_lock);
1307 int ttm_bo_clean_mm(struct ttm_bo_device *bdev, unsigned mem_type)
1309 struct ttm_mem_type_manager *man;
1312 if (mem_type >= TTM_NUM_MEM_TYPES) {
1313 printk(KERN_ERR TTM_PFX "Illegal memory type %d\n", mem_type);
1316 man = &bdev->man[mem_type];
1318 if (!man->has_type) {
1319 printk(KERN_ERR TTM_PFX "Trying to take down uninitialized "
1320 "memory manager type %u\n", mem_type);
1324 man->use_type = false;
1325 man->has_type = false;
1329 ttm_bo_force_list_clean(bdev, mem_type, false);
1331 ret = (*man->func->takedown)(man);
1336 EXPORT_SYMBOL(ttm_bo_clean_mm);
1338 int ttm_bo_evict_mm(struct ttm_bo_device *bdev, unsigned mem_type)
1340 struct ttm_mem_type_manager *man = &bdev->man[mem_type];
1342 if (mem_type == 0 || mem_type >= TTM_NUM_MEM_TYPES) {
1343 printk(KERN_ERR TTM_PFX
1344 "Illegal memory manager memory type %u.\n",
1349 if (!man->has_type) {
1350 printk(KERN_ERR TTM_PFX
1351 "Memory type %u has not been initialized.\n",
1356 return ttm_bo_force_list_clean(bdev, mem_type, true);
1358 EXPORT_SYMBOL(ttm_bo_evict_mm);
1360 int ttm_bo_init_mm(struct ttm_bo_device *bdev, unsigned type,
1361 unsigned long p_size)
1364 struct ttm_mem_type_manager *man;
1366 BUG_ON(type >= TTM_NUM_MEM_TYPES);
1367 man = &bdev->man[type];
1368 BUG_ON(man->has_type);
1370 ret = bdev->driver->init_mem_type(bdev, type, man);
1376 if (type != TTM_PL_SYSTEM) {
1377 ret = (*man->func->init)(man, p_size);
1381 man->has_type = true;
1382 man->use_type = true;
1385 INIT_LIST_HEAD(&man->lru);
1389 EXPORT_SYMBOL(ttm_bo_init_mm);
1391 static void ttm_bo_global_kobj_release(struct kobject *kobj)
1393 struct ttm_bo_global *glob =
1394 container_of(kobj, struct ttm_bo_global, kobj);
1396 ttm_mem_unregister_shrink(glob->mem_glob, &glob->shrink);
1397 __free_page(glob->dummy_read_page);
1401 void ttm_bo_global_release(struct drm_global_reference *ref)
1403 struct ttm_bo_global *glob = ref->object;
1405 kobject_del(&glob->kobj);
1406 kobject_put(&glob->kobj);
1408 EXPORT_SYMBOL(ttm_bo_global_release);
1410 int ttm_bo_global_init(struct drm_global_reference *ref)
1412 struct ttm_bo_global_ref *bo_ref =
1413 container_of(ref, struct ttm_bo_global_ref, ref);
1414 struct ttm_bo_global *glob = ref->object;
1417 mutex_init(&glob->device_list_mutex);
1418 spin_lock_init(&glob->lru_lock);
1419 glob->mem_glob = bo_ref->mem_glob;
1420 glob->dummy_read_page = alloc_page(__GFP_ZERO | GFP_DMA32);
1422 if (unlikely(glob->dummy_read_page == NULL)) {
1427 INIT_LIST_HEAD(&glob->swap_lru);
1428 INIT_LIST_HEAD(&glob->device_list);
1430 ttm_mem_init_shrink(&glob->shrink, ttm_bo_swapout);
1431 ret = ttm_mem_register_shrink(glob->mem_glob, &glob->shrink);
1432 if (unlikely(ret != 0)) {
1433 printk(KERN_ERR TTM_PFX
1434 "Could not register buffer object swapout.\n");
1438 glob->ttm_bo_extra_size =
1439 ttm_round_pot(sizeof(struct ttm_tt)) +
1440 ttm_round_pot(sizeof(struct ttm_backend));
1442 glob->ttm_bo_size = glob->ttm_bo_extra_size +
1443 ttm_round_pot(sizeof(struct ttm_buffer_object));
1445 atomic_set(&glob->bo_count, 0);
1447 ret = kobject_init_and_add(
1448 &glob->kobj, &ttm_bo_glob_kobj_type, ttm_get_kobj(), "buffer_objects");
1449 if (unlikely(ret != 0))
1450 kobject_put(&glob->kobj);
1453 __free_page(glob->dummy_read_page);
1458 EXPORT_SYMBOL(ttm_bo_global_init);
1461 int ttm_bo_device_release(struct ttm_bo_device *bdev)
1464 unsigned i = TTM_NUM_MEM_TYPES;
1465 struct ttm_mem_type_manager *man;
1466 struct ttm_bo_global *glob = bdev->glob;
1469 man = &bdev->man[i];
1470 if (man->has_type) {
1471 man->use_type = false;
1472 if ((i != TTM_PL_SYSTEM) && ttm_bo_clean_mm(bdev, i)) {
1474 printk(KERN_ERR TTM_PFX
1475 "DRM memory manager type %d "
1476 "is not clean.\n", i);
1478 man->has_type = false;
1482 mutex_lock(&glob->device_list_mutex);
1483 list_del(&bdev->device_list);
1484 mutex_unlock(&glob->device_list_mutex);
1486 if (!cancel_delayed_work(&bdev->wq))
1487 flush_scheduled_work();
1489 while (ttm_bo_delayed_delete(bdev, true))
1492 spin_lock(&glob->lru_lock);
1493 if (list_empty(&bdev->ddestroy))
1494 TTM_DEBUG("Delayed destroy list was clean\n");
1496 if (list_empty(&bdev->man[0].lru))
1497 TTM_DEBUG("Swap list was clean\n");
1498 spin_unlock(&glob->lru_lock);
1500 BUG_ON(!drm_mm_clean(&bdev->addr_space_mm));
1501 write_lock(&bdev->vm_lock);
1502 drm_mm_takedown(&bdev->addr_space_mm);
1503 write_unlock(&bdev->vm_lock);
1507 EXPORT_SYMBOL(ttm_bo_device_release);
1509 int ttm_bo_device_init(struct ttm_bo_device *bdev,
1510 struct ttm_bo_global *glob,
1511 struct ttm_bo_driver *driver,
1512 uint64_t file_page_offset,
1517 rwlock_init(&bdev->vm_lock);
1518 bdev->driver = driver;
1520 memset(bdev->man, 0, sizeof(bdev->man));
1523 * Initialize the system memory buffer type.
1524 * Other types need to be driver / IOCTL initialized.
1526 ret = ttm_bo_init_mm(bdev, TTM_PL_SYSTEM, 0);
1527 if (unlikely(ret != 0))
1530 bdev->addr_space_rb = RB_ROOT;
1531 ret = drm_mm_init(&bdev->addr_space_mm, file_page_offset, 0x10000000);
1532 if (unlikely(ret != 0))
1533 goto out_no_addr_mm;
1535 INIT_DELAYED_WORK(&bdev->wq, ttm_bo_delayed_workqueue);
1536 bdev->nice_mode = true;
1537 INIT_LIST_HEAD(&bdev->ddestroy);
1538 bdev->dev_mapping = NULL;
1540 bdev->need_dma32 = need_dma32;
1542 mutex_lock(&glob->device_list_mutex);
1543 list_add_tail(&bdev->device_list, &glob->device_list);
1544 mutex_unlock(&glob->device_list_mutex);
1548 ttm_bo_clean_mm(bdev, 0);
1552 EXPORT_SYMBOL(ttm_bo_device_init);
1555 * buffer object vm functions.
1558 bool ttm_mem_reg_is_pci(struct ttm_bo_device *bdev, struct ttm_mem_reg *mem)
1560 struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
1562 if (!(man->flags & TTM_MEMTYPE_FLAG_FIXED)) {
1563 if (mem->mem_type == TTM_PL_SYSTEM)
1566 if (man->flags & TTM_MEMTYPE_FLAG_CMA)
1569 if (mem->placement & TTM_PL_FLAG_CACHED)
1575 void ttm_bo_unmap_virtual(struct ttm_buffer_object *bo)
1577 struct ttm_bo_device *bdev = bo->bdev;
1578 loff_t offset = (loff_t) bo->addr_space_offset;
1579 loff_t holelen = ((loff_t) bo->mem.num_pages) << PAGE_SHIFT;
1581 if (!bdev->dev_mapping)
1583 unmap_mapping_range(bdev->dev_mapping, offset, holelen, 1);
1584 ttm_mem_io_free(bdev, &bo->mem);
1586 EXPORT_SYMBOL(ttm_bo_unmap_virtual);
1588 static void ttm_bo_vm_insert_rb(struct ttm_buffer_object *bo)
1590 struct ttm_bo_device *bdev = bo->bdev;
1591 struct rb_node **cur = &bdev->addr_space_rb.rb_node;
1592 struct rb_node *parent = NULL;
1593 struct ttm_buffer_object *cur_bo;
1594 unsigned long offset = bo->vm_node->start;
1595 unsigned long cur_offset;
1599 cur_bo = rb_entry(parent, struct ttm_buffer_object, vm_rb);
1600 cur_offset = cur_bo->vm_node->start;
1601 if (offset < cur_offset)
1602 cur = &parent->rb_left;
1603 else if (offset > cur_offset)
1604 cur = &parent->rb_right;
1609 rb_link_node(&bo->vm_rb, parent, cur);
1610 rb_insert_color(&bo->vm_rb, &bdev->addr_space_rb);
1616 * @bo: the buffer to allocate address space for
1618 * Allocate address space in the drm device so that applications
1619 * can mmap the buffer and access the contents. This only
1620 * applies to ttm_bo_type_device objects as others are not
1621 * placed in the drm device address space.
1624 static int ttm_bo_setup_vm(struct ttm_buffer_object *bo)
1626 struct ttm_bo_device *bdev = bo->bdev;
1630 ret = drm_mm_pre_get(&bdev->addr_space_mm);
1631 if (unlikely(ret != 0))
1634 write_lock(&bdev->vm_lock);
1635 bo->vm_node = drm_mm_search_free(&bdev->addr_space_mm,
1636 bo->mem.num_pages, 0, 0);
1638 if (unlikely(bo->vm_node == NULL)) {
1643 bo->vm_node = drm_mm_get_block_atomic(bo->vm_node,
1644 bo->mem.num_pages, 0);
1646 if (unlikely(bo->vm_node == NULL)) {
1647 write_unlock(&bdev->vm_lock);
1651 ttm_bo_vm_insert_rb(bo);
1652 write_unlock(&bdev->vm_lock);
1653 bo->addr_space_offset = ((uint64_t) bo->vm_node->start) << PAGE_SHIFT;
1657 write_unlock(&bdev->vm_lock);
1661 int ttm_bo_wait(struct ttm_buffer_object *bo,
1662 bool lazy, bool interruptible, bool no_wait)
1664 struct ttm_bo_driver *driver = bo->bdev->driver;
1669 if (likely(bo->sync_obj == NULL))
1672 while (bo->sync_obj) {
1674 if (driver->sync_obj_signaled(bo->sync_obj, bo->sync_obj_arg)) {
1675 void *tmp_obj = bo->sync_obj;
1676 bo->sync_obj = NULL;
1677 clear_bit(TTM_BO_PRIV_FLAG_MOVING, &bo->priv_flags);
1678 spin_unlock(&bo->lock);
1679 driver->sync_obj_unref(&tmp_obj);
1680 spin_lock(&bo->lock);
1687 sync_obj = driver->sync_obj_ref(bo->sync_obj);
1688 sync_obj_arg = bo->sync_obj_arg;
1689 spin_unlock(&bo->lock);
1690 ret = driver->sync_obj_wait(sync_obj, sync_obj_arg,
1691 lazy, interruptible);
1692 if (unlikely(ret != 0)) {
1693 driver->sync_obj_unref(&sync_obj);
1694 spin_lock(&bo->lock);
1697 spin_lock(&bo->lock);
1698 if (likely(bo->sync_obj == sync_obj &&
1699 bo->sync_obj_arg == sync_obj_arg)) {
1700 void *tmp_obj = bo->sync_obj;
1701 bo->sync_obj = NULL;
1702 clear_bit(TTM_BO_PRIV_FLAG_MOVING,
1704 spin_unlock(&bo->lock);
1705 driver->sync_obj_unref(&sync_obj);
1706 driver->sync_obj_unref(&tmp_obj);
1707 spin_lock(&bo->lock);
1709 spin_unlock(&bo->lock);
1710 driver->sync_obj_unref(&sync_obj);
1711 spin_lock(&bo->lock);
1716 EXPORT_SYMBOL(ttm_bo_wait);
1718 int ttm_bo_synccpu_write_grab(struct ttm_buffer_object *bo, bool no_wait)
1723 * Using ttm_bo_reserve makes sure the lru lists are updated.
1726 ret = ttm_bo_reserve(bo, true, no_wait, false, 0);
1727 if (unlikely(ret != 0))
1729 spin_lock(&bo->lock);
1730 ret = ttm_bo_wait(bo, false, true, no_wait);
1731 spin_unlock(&bo->lock);
1732 if (likely(ret == 0))
1733 atomic_inc(&bo->cpu_writers);
1734 ttm_bo_unreserve(bo);
1737 EXPORT_SYMBOL(ttm_bo_synccpu_write_grab);
1739 void ttm_bo_synccpu_write_release(struct ttm_buffer_object *bo)
1741 if (atomic_dec_and_test(&bo->cpu_writers))
1742 wake_up_all(&bo->event_queue);
1744 EXPORT_SYMBOL(ttm_bo_synccpu_write_release);
1747 * A buffer object shrink method that tries to swap out the first
1748 * buffer object on the bo_global::swap_lru list.
1751 static int ttm_bo_swapout(struct ttm_mem_shrink *shrink)
1753 struct ttm_bo_global *glob =
1754 container_of(shrink, struct ttm_bo_global, shrink);
1755 struct ttm_buffer_object *bo;
1758 uint32_t swap_placement = (TTM_PL_FLAG_CACHED | TTM_PL_FLAG_SYSTEM);
1760 spin_lock(&glob->lru_lock);
1761 while (ret == -EBUSY) {
1762 if (unlikely(list_empty(&glob->swap_lru))) {
1763 spin_unlock(&glob->lru_lock);
1767 bo = list_first_entry(&glob->swap_lru,
1768 struct ttm_buffer_object, swap);
1769 kref_get(&bo->list_kref);
1771 if (!list_empty(&bo->ddestroy)) {
1772 spin_unlock(&glob->lru_lock);
1773 (void) ttm_bo_cleanup_refs(bo, false, false, false);
1774 kref_put(&bo->list_kref, ttm_bo_release_list);
1779 * Reserve buffer. Since we unlock while sleeping, we need
1780 * to re-check that nobody removed us from the swap-list while
1784 ret = ttm_bo_reserve_locked(bo, false, true, false, 0);
1785 if (unlikely(ret == -EBUSY)) {
1786 spin_unlock(&glob->lru_lock);
1787 ttm_bo_wait_unreserved(bo, false);
1788 kref_put(&bo->list_kref, ttm_bo_release_list);
1789 spin_lock(&glob->lru_lock);
1794 put_count = ttm_bo_del_from_lru(bo);
1795 spin_unlock(&glob->lru_lock);
1798 kref_put(&bo->list_kref, ttm_bo_ref_bug);
1801 * Wait for GPU, then move to system cached.
1804 spin_lock(&bo->lock);
1805 ret = ttm_bo_wait(bo, false, false, false);
1806 spin_unlock(&bo->lock);
1808 if (unlikely(ret != 0))
1811 if ((bo->mem.placement & swap_placement) != swap_placement) {
1812 struct ttm_mem_reg evict_mem;
1814 evict_mem = bo->mem;
1815 evict_mem.mm_node = NULL;
1816 evict_mem.placement = TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED;
1817 evict_mem.mem_type = TTM_PL_SYSTEM;
1819 ret = ttm_bo_handle_move_mem(bo, &evict_mem, true,
1820 false, false, false);
1821 if (unlikely(ret != 0))
1825 ttm_bo_unmap_virtual(bo);
1828 * Swap out. Buffer will be swapped in again as soon as
1829 * anyone tries to access a ttm page.
1832 if (bo->bdev->driver->swap_notify)
1833 bo->bdev->driver->swap_notify(bo);
1835 ret = ttm_tt_swapout(bo->ttm, bo->persistant_swap_storage);
1840 * Unreserve without putting on LRU to avoid swapping out an
1841 * already swapped buffer.
1844 atomic_set(&bo->reserved, 0);
1845 wake_up_all(&bo->event_queue);
1846 kref_put(&bo->list_kref, ttm_bo_release_list);
1850 void ttm_bo_swapout_all(struct ttm_bo_device *bdev)
1852 while (ttm_bo_swapout(&bdev->glob->shrink) == 0)
1855 EXPORT_SYMBOL(ttm_bo_swapout_all);