1 /**************************************************************************
3 * Copyright (c) 2006-2009 VMware, Inc., Palo Alto, CA., USA
6 * Permission is hereby granted, free of charge, to any person obtaining a
7 * copy of this software and associated documentation files (the
8 * "Software"), to deal in the Software without restriction, including
9 * without limitation the rights to use, copy, modify, merge, publish,
10 * distribute, sub license, and/or sell copies of the Software, and to
11 * permit persons to whom the Software is furnished to do so, subject to
12 * the following conditions:
14 * The above copyright notice and this permission notice (including the
15 * next paragraph) shall be included in all copies or substantial portions
18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
19 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
20 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
21 * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
22 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
23 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
24 * USE OR OTHER DEALINGS IN THE SOFTWARE.
26 **************************************************************************/
28 * Authors: Thomas Hellstrom <thellstrom-at-vmware-dot-com>
32 * We store bo pointer in drm_mm_node struct so we know which bo own a
33 * specific node. There is no protection on the pointer, thus to make
34 * sure things don't go berserk you have to access this pointer while
35 * holding the global lru lock and make sure anytime you free a node you
36 * reset the pointer to NULL.
39 #include "ttm/ttm_module.h"
40 #include "ttm/ttm_bo_driver.h"
41 #include "ttm/ttm_placement.h"
42 #include <linux/jiffies.h>
43 #include <linux/slab.h>
44 #include <linux/sched.h>
46 #include <linux/file.h>
47 #include <linux/module.h>
49 #define TTM_ASSERT_LOCKED(param)
50 #define TTM_DEBUG(fmt, arg...)
51 #define TTM_BO_HASH_ORDER 13
53 static int ttm_bo_setup_vm(struct ttm_buffer_object *bo);
54 static int ttm_bo_swapout(struct ttm_mem_shrink *shrink);
55 static void ttm_bo_global_kobj_release(struct kobject *kobj);
57 static struct attribute ttm_bo_count = {
62 static inline int ttm_mem_type_from_flags(uint32_t flags, uint32_t *mem_type)
66 for (i = 0; i <= TTM_PL_PRIV5; i++)
67 if (flags & (1 << i)) {
74 static void ttm_mem_type_debug(struct ttm_bo_device *bdev, int mem_type)
76 struct ttm_mem_type_manager *man = &bdev->man[mem_type];
78 printk(KERN_ERR TTM_PFX " has_type: %d\n", man->has_type);
79 printk(KERN_ERR TTM_PFX " use_type: %d\n", man->use_type);
80 printk(KERN_ERR TTM_PFX " flags: 0x%08X\n", man->flags);
81 printk(KERN_ERR TTM_PFX " gpu_offset: 0x%08lX\n", man->gpu_offset);
82 printk(KERN_ERR TTM_PFX " size: %llu\n", man->size);
83 printk(KERN_ERR TTM_PFX " available_caching: 0x%08X\n",
84 man->available_caching);
85 printk(KERN_ERR TTM_PFX " default_caching: 0x%08X\n",
86 man->default_caching);
87 if (mem_type != TTM_PL_SYSTEM) {
88 spin_lock(&bdev->glob->lru_lock);
89 drm_mm_debug_table(&man->manager, TTM_PFX);
90 spin_unlock(&bdev->glob->lru_lock);
94 static void ttm_bo_mem_space_debug(struct ttm_buffer_object *bo,
95 struct ttm_placement *placement)
99 printk(KERN_ERR TTM_PFX "No space for %p (%lu pages, %luK, %luM)\n",
100 bo, bo->mem.num_pages, bo->mem.size >> 10,
102 for (i = 0; i < placement->num_placement; i++) {
103 ret = ttm_mem_type_from_flags(placement->placement[i],
107 printk(KERN_ERR TTM_PFX " placement[%d]=0x%08X (%d)\n",
108 i, placement->placement[i], mem_type);
109 ttm_mem_type_debug(bo->bdev, mem_type);
113 static ssize_t ttm_bo_global_show(struct kobject *kobj,
114 struct attribute *attr,
117 struct ttm_bo_global *glob =
118 container_of(kobj, struct ttm_bo_global, kobj);
120 return snprintf(buffer, PAGE_SIZE, "%lu\n",
121 (unsigned long) atomic_read(&glob->bo_count));
124 static struct attribute *ttm_bo_global_attrs[] = {
129 static const struct sysfs_ops ttm_bo_global_ops = {
130 .show = &ttm_bo_global_show
133 static struct kobj_type ttm_bo_glob_kobj_type = {
134 .release = &ttm_bo_global_kobj_release,
135 .sysfs_ops = &ttm_bo_global_ops,
136 .default_attrs = ttm_bo_global_attrs
140 static inline uint32_t ttm_bo_type_flags(unsigned type)
145 static void ttm_bo_release_list(struct kref *list_kref)
147 struct ttm_buffer_object *bo =
148 container_of(list_kref, struct ttm_buffer_object, list_kref);
149 struct ttm_bo_device *bdev = bo->bdev;
151 BUG_ON(atomic_read(&bo->list_kref.refcount));
152 BUG_ON(atomic_read(&bo->kref.refcount));
153 BUG_ON(atomic_read(&bo->cpu_writers));
154 BUG_ON(bo->sync_obj != NULL);
155 BUG_ON(bo->mem.mm_node != NULL);
156 BUG_ON(!list_empty(&bo->lru));
157 BUG_ON(!list_empty(&bo->ddestroy));
160 ttm_tt_destroy(bo->ttm);
161 atomic_dec(&bo->glob->bo_count);
165 ttm_mem_global_free(bdev->glob->mem_glob, bo->acc_size);
170 int ttm_bo_wait_unreserved(struct ttm_buffer_object *bo, bool interruptible)
176 ret = wait_event_interruptible(bo->event_queue,
177 atomic_read(&bo->reserved) == 0);
178 if (unlikely(ret != 0))
181 wait_event(bo->event_queue, atomic_read(&bo->reserved) == 0);
185 EXPORT_SYMBOL(ttm_bo_wait_unreserved);
187 static void ttm_bo_add_to_lru(struct ttm_buffer_object *bo)
189 struct ttm_bo_device *bdev = bo->bdev;
190 struct ttm_mem_type_manager *man;
192 BUG_ON(!atomic_read(&bo->reserved));
194 if (!(bo->mem.placement & TTM_PL_FLAG_NO_EVICT)) {
196 BUG_ON(!list_empty(&bo->lru));
198 man = &bdev->man[bo->mem.mem_type];
199 list_add_tail(&bo->lru, &man->lru);
200 kref_get(&bo->list_kref);
202 if (bo->ttm != NULL) {
203 list_add_tail(&bo->swap, &bo->glob->swap_lru);
204 kref_get(&bo->list_kref);
210 * Call with the lru_lock held.
213 static int ttm_bo_del_from_lru(struct ttm_buffer_object *bo)
217 if (!list_empty(&bo->swap)) {
218 list_del_init(&bo->swap);
221 if (!list_empty(&bo->lru)) {
222 list_del_init(&bo->lru);
227 * TODO: Add a driver hook to delete from
228 * driver-specific LRU's here.
234 int ttm_bo_reserve_locked(struct ttm_buffer_object *bo,
236 bool no_wait, bool use_sequence, uint32_t sequence)
238 struct ttm_bo_global *glob = bo->glob;
241 while (unlikely(atomic_cmpxchg(&bo->reserved, 0, 1) != 0)) {
242 if (use_sequence && bo->seq_valid &&
243 (sequence - bo->val_seq < (1 << 31))) {
250 spin_unlock(&glob->lru_lock);
251 ret = ttm_bo_wait_unreserved(bo, interruptible);
252 spin_lock(&glob->lru_lock);
259 bo->val_seq = sequence;
260 bo->seq_valid = true;
262 bo->seq_valid = false;
267 EXPORT_SYMBOL(ttm_bo_reserve);
269 static void ttm_bo_ref_bug(struct kref *list_kref)
274 int ttm_bo_reserve(struct ttm_buffer_object *bo,
276 bool no_wait, bool use_sequence, uint32_t sequence)
278 struct ttm_bo_global *glob = bo->glob;
282 spin_lock(&glob->lru_lock);
283 ret = ttm_bo_reserve_locked(bo, interruptible, no_wait, use_sequence,
285 if (likely(ret == 0))
286 put_count = ttm_bo_del_from_lru(bo);
287 spin_unlock(&glob->lru_lock);
290 kref_put(&bo->list_kref, ttm_bo_ref_bug);
295 void ttm_bo_unreserve(struct ttm_buffer_object *bo)
297 struct ttm_bo_global *glob = bo->glob;
299 spin_lock(&glob->lru_lock);
300 ttm_bo_add_to_lru(bo);
301 atomic_set(&bo->reserved, 0);
302 wake_up_all(&bo->event_queue);
303 spin_unlock(&glob->lru_lock);
305 EXPORT_SYMBOL(ttm_bo_unreserve);
308 * Call bo->mutex locked.
310 static int ttm_bo_add_ttm(struct ttm_buffer_object *bo, bool zero_alloc)
312 struct ttm_bo_device *bdev = bo->bdev;
313 struct ttm_bo_global *glob = bo->glob;
315 uint32_t page_flags = 0;
317 TTM_ASSERT_LOCKED(&bo->mutex);
320 if (bdev->need_dma32)
321 page_flags |= TTM_PAGE_FLAG_DMA32;
324 case ttm_bo_type_device:
326 page_flags |= TTM_PAGE_FLAG_ZERO_ALLOC;
327 case ttm_bo_type_kernel:
328 bo->ttm = ttm_tt_create(bdev, bo->num_pages << PAGE_SHIFT,
329 page_flags, glob->dummy_read_page);
330 if (unlikely(bo->ttm == NULL))
333 case ttm_bo_type_user:
334 bo->ttm = ttm_tt_create(bdev, bo->num_pages << PAGE_SHIFT,
335 page_flags | TTM_PAGE_FLAG_USER,
336 glob->dummy_read_page);
337 if (unlikely(bo->ttm == NULL)) {
342 ret = ttm_tt_set_user(bo->ttm, current,
343 bo->buffer_start, bo->num_pages);
344 if (unlikely(ret != 0))
345 ttm_tt_destroy(bo->ttm);
348 printk(KERN_ERR TTM_PFX "Illegal buffer object type\n");
356 static int ttm_bo_handle_move_mem(struct ttm_buffer_object *bo,
357 struct ttm_mem_reg *mem,
358 bool evict, bool interruptible,
359 bool no_wait_reserve, bool no_wait_gpu)
361 struct ttm_bo_device *bdev = bo->bdev;
362 bool old_is_pci = ttm_mem_reg_is_pci(bdev, &bo->mem);
363 bool new_is_pci = ttm_mem_reg_is_pci(bdev, mem);
364 struct ttm_mem_type_manager *old_man = &bdev->man[bo->mem.mem_type];
365 struct ttm_mem_type_manager *new_man = &bdev->man[mem->mem_type];
368 if (old_is_pci || new_is_pci ||
369 ((mem->placement & bo->mem.placement & TTM_PL_MASK_CACHING) == 0))
370 ttm_bo_unmap_virtual(bo);
373 * Create and bind a ttm if required.
376 if (!(new_man->flags & TTM_MEMTYPE_FLAG_FIXED) && (bo->ttm == NULL)) {
377 ret = ttm_bo_add_ttm(bo, false);
381 ret = ttm_tt_set_placement_caching(bo->ttm, mem->placement);
385 if (mem->mem_type != TTM_PL_SYSTEM) {
386 ret = ttm_tt_bind(bo->ttm, mem);
391 if (bo->mem.mem_type == TTM_PL_SYSTEM) {
399 if (bdev->driver->move_notify)
400 bdev->driver->move_notify(bo, mem);
402 if (!(old_man->flags & TTM_MEMTYPE_FLAG_FIXED) &&
403 !(new_man->flags & TTM_MEMTYPE_FLAG_FIXED))
404 ret = ttm_bo_move_ttm(bo, evict, no_wait_reserve, no_wait_gpu, mem);
405 else if (bdev->driver->move)
406 ret = bdev->driver->move(bo, evict, interruptible,
407 no_wait_reserve, no_wait_gpu, mem);
409 ret = ttm_bo_move_memcpy(bo, evict, no_wait_reserve, no_wait_gpu, mem);
416 ret = bdev->driver->invalidate_caches(bdev, bo->mem.placement);
418 printk(KERN_ERR TTM_PFX "Can not flush read caches\n");
422 if (bo->mem.mm_node) {
423 spin_lock(&bo->lock);
424 bo->offset = (bo->mem.mm_node->start << PAGE_SHIFT) +
425 bdev->man[bo->mem.mem_type].gpu_offset;
426 bo->cur_placement = bo->mem.placement;
427 spin_unlock(&bo->lock);
434 new_man = &bdev->man[bo->mem.mem_type];
435 if ((new_man->flags & TTM_MEMTYPE_FLAG_FIXED) && bo->ttm) {
436 ttm_tt_unbind(bo->ttm);
437 ttm_tt_destroy(bo->ttm);
445 * If bo idle, remove from delayed- and lru lists, and unref.
446 * If not idle, and already on delayed list, do nothing.
447 * If not idle, and not on delayed list, put on delayed list,
448 * up the list_kref and schedule a delayed list check.
451 static int ttm_bo_cleanup_refs(struct ttm_buffer_object *bo, bool remove_all)
453 struct ttm_bo_device *bdev = bo->bdev;
454 struct ttm_bo_global *glob = bo->glob;
455 struct ttm_bo_driver *driver = bdev->driver;
458 spin_lock(&bo->lock);
459 (void) ttm_bo_wait(bo, false, false, !remove_all);
464 spin_unlock(&bo->lock);
466 spin_lock(&glob->lru_lock);
467 put_count = ttm_bo_del_from_lru(bo);
469 ret = ttm_bo_reserve_locked(bo, false, false, false, 0);
472 ttm_tt_unbind(bo->ttm);
474 if (!list_empty(&bo->ddestroy)) {
475 list_del_init(&bo->ddestroy);
478 if (bo->mem.mm_node) {
479 bo->mem.mm_node->private = NULL;
480 drm_mm_put_block(bo->mem.mm_node);
481 bo->mem.mm_node = NULL;
483 spin_unlock(&glob->lru_lock);
485 atomic_set(&bo->reserved, 0);
488 kref_put(&bo->list_kref, ttm_bo_ref_bug);
493 spin_lock(&glob->lru_lock);
494 if (list_empty(&bo->ddestroy)) {
495 void *sync_obj = bo->sync_obj;
496 void *sync_obj_arg = bo->sync_obj_arg;
498 kref_get(&bo->list_kref);
499 list_add_tail(&bo->ddestroy, &bdev->ddestroy);
500 spin_unlock(&glob->lru_lock);
501 spin_unlock(&bo->lock);
504 driver->sync_obj_flush(sync_obj, sync_obj_arg);
505 schedule_delayed_work(&bdev->wq,
506 ((HZ / 100) < 1) ? 1 : HZ / 100);
510 spin_unlock(&glob->lru_lock);
511 spin_unlock(&bo->lock);
519 * Traverse the delayed list, and call ttm_bo_cleanup_refs on all
520 * encountered buffers.
523 static int ttm_bo_delayed_delete(struct ttm_bo_device *bdev, bool remove_all)
525 struct ttm_bo_global *glob = bdev->glob;
526 struct ttm_buffer_object *entry = NULL;
529 spin_lock(&glob->lru_lock);
530 if (list_empty(&bdev->ddestroy))
533 entry = list_first_entry(&bdev->ddestroy,
534 struct ttm_buffer_object, ddestroy);
535 kref_get(&entry->list_kref);
538 struct ttm_buffer_object *nentry = NULL;
540 if (entry->ddestroy.next != &bdev->ddestroy) {
541 nentry = list_first_entry(&entry->ddestroy,
542 struct ttm_buffer_object, ddestroy);
543 kref_get(&nentry->list_kref);
546 spin_unlock(&glob->lru_lock);
547 ret = ttm_bo_cleanup_refs(entry, remove_all);
548 kref_put(&entry->list_kref, ttm_bo_release_list);
554 spin_lock(&glob->lru_lock);
555 if (list_empty(&entry->ddestroy))
560 spin_unlock(&glob->lru_lock);
563 kref_put(&entry->list_kref, ttm_bo_release_list);
567 static void ttm_bo_delayed_workqueue(struct work_struct *work)
569 struct ttm_bo_device *bdev =
570 container_of(work, struct ttm_bo_device, wq.work);
572 if (ttm_bo_delayed_delete(bdev, false)) {
573 schedule_delayed_work(&bdev->wq,
574 ((HZ / 100) < 1) ? 1 : HZ / 100);
578 static void ttm_bo_release(struct kref *kref)
580 struct ttm_buffer_object *bo =
581 container_of(kref, struct ttm_buffer_object, kref);
582 struct ttm_bo_device *bdev = bo->bdev;
584 if (likely(bo->vm_node != NULL)) {
585 rb_erase(&bo->vm_rb, &bdev->addr_space_rb);
586 drm_mm_put_block(bo->vm_node);
589 write_unlock(&bdev->vm_lock);
590 ttm_bo_cleanup_refs(bo, false);
591 kref_put(&bo->list_kref, ttm_bo_release_list);
592 write_lock(&bdev->vm_lock);
595 void ttm_bo_unref(struct ttm_buffer_object **p_bo)
597 struct ttm_buffer_object *bo = *p_bo;
598 struct ttm_bo_device *bdev = bo->bdev;
601 write_lock(&bdev->vm_lock);
602 kref_put(&bo->kref, ttm_bo_release);
603 write_unlock(&bdev->vm_lock);
605 EXPORT_SYMBOL(ttm_bo_unref);
607 int ttm_bo_lock_delayed_workqueue(struct ttm_bo_device *bdev)
609 return cancel_delayed_work_sync(&bdev->wq);
611 EXPORT_SYMBOL(ttm_bo_lock_delayed_workqueue);
613 void ttm_bo_unlock_delayed_workqueue(struct ttm_bo_device *bdev, int resched)
616 schedule_delayed_work(&bdev->wq,
617 ((HZ / 100) < 1) ? 1 : HZ / 100);
619 EXPORT_SYMBOL(ttm_bo_unlock_delayed_workqueue);
621 static int ttm_bo_evict(struct ttm_buffer_object *bo, bool interruptible,
622 bool no_wait_reserve, bool no_wait_gpu)
624 struct ttm_bo_device *bdev = bo->bdev;
625 struct ttm_bo_global *glob = bo->glob;
626 struct ttm_mem_reg evict_mem;
627 struct ttm_placement placement;
630 spin_lock(&bo->lock);
631 ret = ttm_bo_wait(bo, false, interruptible, no_wait_gpu);
632 spin_unlock(&bo->lock);
634 if (unlikely(ret != 0)) {
635 if (ret != -ERESTARTSYS) {
636 printk(KERN_ERR TTM_PFX
637 "Failed to expire sync object before "
638 "buffer eviction.\n");
643 BUG_ON(!atomic_read(&bo->reserved));
646 evict_mem.mm_node = NULL;
647 evict_mem.bus.io_reserved = false;
651 placement.num_placement = 0;
652 placement.num_busy_placement = 0;
653 bdev->driver->evict_flags(bo, &placement);
654 ret = ttm_bo_mem_space(bo, &placement, &evict_mem, interruptible,
655 no_wait_reserve, no_wait_gpu);
657 if (ret != -ERESTARTSYS) {
658 printk(KERN_ERR TTM_PFX
659 "Failed to find memory space for "
660 "buffer 0x%p eviction.\n", bo);
661 ttm_bo_mem_space_debug(bo, &placement);
666 ret = ttm_bo_handle_move_mem(bo, &evict_mem, true, interruptible,
667 no_wait_reserve, no_wait_gpu);
669 if (ret != -ERESTARTSYS)
670 printk(KERN_ERR TTM_PFX "Buffer eviction failed\n");
671 spin_lock(&glob->lru_lock);
672 if (evict_mem.mm_node) {
673 evict_mem.mm_node->private = NULL;
674 drm_mm_put_block(evict_mem.mm_node);
675 evict_mem.mm_node = NULL;
677 spin_unlock(&glob->lru_lock);
685 static int ttm_mem_evict_first(struct ttm_bo_device *bdev,
687 bool interruptible, bool no_wait_reserve,
690 struct ttm_bo_global *glob = bdev->glob;
691 struct ttm_mem_type_manager *man = &bdev->man[mem_type];
692 struct ttm_buffer_object *bo;
693 int ret, put_count = 0;
696 spin_lock(&glob->lru_lock);
697 if (list_empty(&man->lru)) {
698 spin_unlock(&glob->lru_lock);
702 bo = list_first_entry(&man->lru, struct ttm_buffer_object, lru);
703 kref_get(&bo->list_kref);
705 ret = ttm_bo_reserve_locked(bo, false, no_wait_reserve, false, 0);
707 if (unlikely(ret == -EBUSY)) {
708 spin_unlock(&glob->lru_lock);
709 if (likely(!no_wait_gpu))
710 ret = ttm_bo_wait_unreserved(bo, interruptible);
712 kref_put(&bo->list_kref, ttm_bo_release_list);
715 * We *need* to retry after releasing the lru lock.
718 if (unlikely(ret != 0))
723 put_count = ttm_bo_del_from_lru(bo);
724 spin_unlock(&glob->lru_lock);
729 kref_put(&bo->list_kref, ttm_bo_ref_bug);
731 ret = ttm_bo_evict(bo, interruptible, no_wait_reserve, no_wait_gpu);
732 ttm_bo_unreserve(bo);
734 kref_put(&bo->list_kref, ttm_bo_release_list);
738 static int ttm_bo_man_get_node(struct ttm_buffer_object *bo,
739 struct ttm_mem_type_manager *man,
740 struct ttm_placement *placement,
741 struct ttm_mem_reg *mem,
742 struct drm_mm_node **node)
744 struct ttm_bo_global *glob = bo->glob;
748 lpfn = placement->lpfn;
753 ret = drm_mm_pre_get(&man->manager);
757 spin_lock(&glob->lru_lock);
758 *node = drm_mm_search_free_in_range(&man->manager,
759 mem->num_pages, mem->page_alignment,
760 placement->fpfn, lpfn, 1);
761 if (unlikely(*node == NULL)) {
762 spin_unlock(&glob->lru_lock);
765 *node = drm_mm_get_block_atomic_range(*node, mem->num_pages,
769 spin_unlock(&glob->lru_lock);
770 } while (*node == NULL);
775 * Repeatedly evict memory from the LRU for @mem_type until we create enough
776 * space, or we've evicted everything and there isn't enough space.
778 static int ttm_bo_mem_force_space(struct ttm_buffer_object *bo,
780 struct ttm_placement *placement,
781 struct ttm_mem_reg *mem,
783 bool no_wait_reserve,
786 struct ttm_bo_device *bdev = bo->bdev;
787 struct ttm_bo_global *glob = bdev->glob;
788 struct ttm_mem_type_manager *man = &bdev->man[mem_type];
789 struct drm_mm_node *node;
793 ret = ttm_bo_man_get_node(bo, man, placement, mem, &node);
794 if (unlikely(ret != 0))
798 spin_lock(&glob->lru_lock);
799 if (list_empty(&man->lru)) {
800 spin_unlock(&glob->lru_lock);
803 spin_unlock(&glob->lru_lock);
804 ret = ttm_mem_evict_first(bdev, mem_type, interruptible,
805 no_wait_reserve, no_wait_gpu);
806 if (unlikely(ret != 0))
812 mem->mem_type = mem_type;
816 static uint32_t ttm_bo_select_caching(struct ttm_mem_type_manager *man,
817 uint32_t cur_placement,
818 uint32_t proposed_placement)
820 uint32_t caching = proposed_placement & TTM_PL_MASK_CACHING;
821 uint32_t result = proposed_placement & ~TTM_PL_MASK_CACHING;
824 * Keep current caching if possible.
827 if ((cur_placement & caching) != 0)
828 result |= (cur_placement & caching);
829 else if ((man->default_caching & caching) != 0)
830 result |= man->default_caching;
831 else if ((TTM_PL_FLAG_CACHED & caching) != 0)
832 result |= TTM_PL_FLAG_CACHED;
833 else if ((TTM_PL_FLAG_WC & caching) != 0)
834 result |= TTM_PL_FLAG_WC;
835 else if ((TTM_PL_FLAG_UNCACHED & caching) != 0)
836 result |= TTM_PL_FLAG_UNCACHED;
841 static bool ttm_bo_mt_compatible(struct ttm_mem_type_manager *man,
844 uint32_t proposed_placement,
845 uint32_t *masked_placement)
847 uint32_t cur_flags = ttm_bo_type_flags(mem_type);
849 if ((man->flags & TTM_MEMTYPE_FLAG_FIXED) && disallow_fixed)
852 if ((cur_flags & proposed_placement & TTM_PL_MASK_MEM) == 0)
855 if ((proposed_placement & man->available_caching) == 0)
858 cur_flags |= (proposed_placement & man->available_caching);
860 *masked_placement = cur_flags;
865 * Creates space for memory region @mem according to its type.
867 * This function first searches for free space in compatible memory types in
868 * the priority order defined by the driver. If free space isn't found, then
869 * ttm_bo_mem_force_space is attempted in priority order to evict and find
872 int ttm_bo_mem_space(struct ttm_buffer_object *bo,
873 struct ttm_placement *placement,
874 struct ttm_mem_reg *mem,
875 bool interruptible, bool no_wait_reserve,
878 struct ttm_bo_device *bdev = bo->bdev;
879 struct ttm_mem_type_manager *man;
880 uint32_t mem_type = TTM_PL_SYSTEM;
881 uint32_t cur_flags = 0;
882 bool type_found = false;
883 bool type_ok = false;
884 bool has_erestartsys = false;
885 struct drm_mm_node *node = NULL;
889 for (i = 0; i < placement->num_placement; ++i) {
890 ret = ttm_mem_type_from_flags(placement->placement[i],
894 man = &bdev->man[mem_type];
896 type_ok = ttm_bo_mt_compatible(man,
897 bo->type == ttm_bo_type_user,
899 placement->placement[i],
905 cur_flags = ttm_bo_select_caching(man, bo->mem.placement,
908 * Use the access and other non-mapping-related flag bits from
909 * the memory placement flags to the current flags
911 ttm_flag_masked(&cur_flags, placement->placement[i],
912 ~TTM_PL_MASK_MEMTYPE);
914 if (mem_type == TTM_PL_SYSTEM)
917 if (man->has_type && man->use_type) {
919 ret = ttm_bo_man_get_node(bo, man, placement, mem,
928 if ((type_ok && (mem_type == TTM_PL_SYSTEM)) || node) {
930 mem->mem_type = mem_type;
931 mem->placement = cur_flags;
940 for (i = 0; i < placement->num_busy_placement; ++i) {
941 ret = ttm_mem_type_from_flags(placement->busy_placement[i],
945 man = &bdev->man[mem_type];
948 if (!ttm_bo_mt_compatible(man,
949 bo->type == ttm_bo_type_user,
951 placement->busy_placement[i],
955 cur_flags = ttm_bo_select_caching(man, bo->mem.placement,
958 * Use the access and other non-mapping-related flag bits from
959 * the memory placement flags to the current flags
961 ttm_flag_masked(&cur_flags, placement->busy_placement[i],
962 ~TTM_PL_MASK_MEMTYPE);
965 if (mem_type == TTM_PL_SYSTEM) {
966 mem->mem_type = mem_type;
967 mem->placement = cur_flags;
972 ret = ttm_bo_mem_force_space(bo, mem_type, placement, mem,
973 interruptible, no_wait_reserve, no_wait_gpu);
974 if (ret == 0 && mem->mm_node) {
975 mem->placement = cur_flags;
976 mem->mm_node->private = bo;
979 if (ret == -ERESTARTSYS)
980 has_erestartsys = true;
982 ret = (has_erestartsys) ? -ERESTARTSYS : -ENOMEM;
985 EXPORT_SYMBOL(ttm_bo_mem_space);
987 int ttm_bo_wait_cpu(struct ttm_buffer_object *bo, bool no_wait)
989 if ((atomic_read(&bo->cpu_writers) > 0) && no_wait)
992 return wait_event_interruptible(bo->event_queue,
993 atomic_read(&bo->cpu_writers) == 0);
995 EXPORT_SYMBOL(ttm_bo_wait_cpu);
997 int ttm_bo_move_buffer(struct ttm_buffer_object *bo,
998 struct ttm_placement *placement,
999 bool interruptible, bool no_wait_reserve,
1002 struct ttm_bo_global *glob = bo->glob;
1004 struct ttm_mem_reg mem;
1006 BUG_ON(!atomic_read(&bo->reserved));
1009 * FIXME: It's possible to pipeline buffer moves.
1010 * Have the driver move function wait for idle when necessary,
1011 * instead of doing it here.
1013 spin_lock(&bo->lock);
1014 ret = ttm_bo_wait(bo, false, interruptible, no_wait_gpu);
1015 spin_unlock(&bo->lock);
1018 mem.num_pages = bo->num_pages;
1019 mem.size = mem.num_pages << PAGE_SHIFT;
1020 mem.page_alignment = bo->mem.page_alignment;
1021 mem.bus.io_reserved = false;
1023 * Determine where to move the buffer.
1025 ret = ttm_bo_mem_space(bo, placement, &mem, interruptible, no_wait_reserve, no_wait_gpu);
1028 ret = ttm_bo_handle_move_mem(bo, &mem, false, interruptible, no_wait_reserve, no_wait_gpu);
1030 if (ret && mem.mm_node) {
1031 spin_lock(&glob->lru_lock);
1032 mem.mm_node->private = NULL;
1033 drm_mm_put_block(mem.mm_node);
1034 spin_unlock(&glob->lru_lock);
1039 static int ttm_bo_mem_compat(struct ttm_placement *placement,
1040 struct ttm_mem_reg *mem)
1043 struct drm_mm_node *node = mem->mm_node;
1045 if (node && placement->lpfn != 0 &&
1046 (node->start < placement->fpfn ||
1047 node->start + node->size > placement->lpfn))
1050 for (i = 0; i < placement->num_placement; i++) {
1051 if ((placement->placement[i] & mem->placement &
1052 TTM_PL_MASK_CACHING) &&
1053 (placement->placement[i] & mem->placement &
1060 int ttm_bo_validate(struct ttm_buffer_object *bo,
1061 struct ttm_placement *placement,
1062 bool interruptible, bool no_wait_reserve,
1067 BUG_ON(!atomic_read(&bo->reserved));
1068 /* Check that range is valid */
1069 if (placement->lpfn || placement->fpfn)
1070 if (placement->fpfn > placement->lpfn ||
1071 (placement->lpfn - placement->fpfn) < bo->num_pages)
1074 * Check whether we need to move buffer.
1076 ret = ttm_bo_mem_compat(placement, &bo->mem);
1078 ret = ttm_bo_move_buffer(bo, placement, interruptible, no_wait_reserve, no_wait_gpu);
1083 * Use the access and other non-mapping-related flag bits from
1084 * the compatible memory placement flags to the active flags
1086 ttm_flag_masked(&bo->mem.placement, placement->placement[ret],
1087 ~TTM_PL_MASK_MEMTYPE);
1090 * We might need to add a TTM.
1092 if (bo->mem.mem_type == TTM_PL_SYSTEM && bo->ttm == NULL) {
1093 ret = ttm_bo_add_ttm(bo, true);
1099 EXPORT_SYMBOL(ttm_bo_validate);
1101 int ttm_bo_check_placement(struct ttm_buffer_object *bo,
1102 struct ttm_placement *placement)
1106 if (placement->fpfn || placement->lpfn) {
1107 if (bo->mem.num_pages > (placement->lpfn - placement->fpfn)) {
1108 printk(KERN_ERR TTM_PFX "Page number range to small "
1109 "Need %lu pages, range is [%u, %u]\n",
1110 bo->mem.num_pages, placement->fpfn,
1115 for (i = 0; i < placement->num_placement; i++) {
1116 if (!capable(CAP_SYS_ADMIN)) {
1117 if (placement->placement[i] & TTM_PL_FLAG_NO_EVICT) {
1118 printk(KERN_ERR TTM_PFX "Need to be root to "
1119 "modify NO_EVICT status.\n");
1124 for (i = 0; i < placement->num_busy_placement; i++) {
1125 if (!capable(CAP_SYS_ADMIN)) {
1126 if (placement->busy_placement[i] & TTM_PL_FLAG_NO_EVICT) {
1127 printk(KERN_ERR TTM_PFX "Need to be root to "
1128 "modify NO_EVICT status.\n");
1136 int ttm_bo_init(struct ttm_bo_device *bdev,
1137 struct ttm_buffer_object *bo,
1139 enum ttm_bo_type type,
1140 struct ttm_placement *placement,
1141 uint32_t page_alignment,
1142 unsigned long buffer_start,
1144 struct file *persistant_swap_storage,
1146 void (*destroy) (struct ttm_buffer_object *))
1149 unsigned long num_pages;
1151 size += buffer_start & ~PAGE_MASK;
1152 num_pages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
1153 if (num_pages == 0) {
1154 printk(KERN_ERR TTM_PFX "Illegal buffer object size.\n");
1157 bo->destroy = destroy;
1159 spin_lock_init(&bo->lock);
1160 kref_init(&bo->kref);
1161 kref_init(&bo->list_kref);
1162 atomic_set(&bo->cpu_writers, 0);
1163 atomic_set(&bo->reserved, 1);
1164 init_waitqueue_head(&bo->event_queue);
1165 INIT_LIST_HEAD(&bo->lru);
1166 INIT_LIST_HEAD(&bo->ddestroy);
1167 INIT_LIST_HEAD(&bo->swap);
1169 bo->glob = bdev->glob;
1171 bo->num_pages = num_pages;
1172 bo->mem.size = num_pages << PAGE_SHIFT;
1173 bo->mem.mem_type = TTM_PL_SYSTEM;
1174 bo->mem.num_pages = bo->num_pages;
1175 bo->mem.mm_node = NULL;
1176 bo->mem.page_alignment = page_alignment;
1177 bo->mem.bus.io_reserved = false;
1178 bo->buffer_start = buffer_start & PAGE_MASK;
1180 bo->mem.placement = (TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED);
1181 bo->seq_valid = false;
1182 bo->persistant_swap_storage = persistant_swap_storage;
1183 bo->acc_size = acc_size;
1184 atomic_inc(&bo->glob->bo_count);
1186 ret = ttm_bo_check_placement(bo, placement);
1187 if (unlikely(ret != 0))
1191 * For ttm_bo_type_device buffers, allocate
1192 * address space from the device.
1194 if (bo->type == ttm_bo_type_device) {
1195 ret = ttm_bo_setup_vm(bo);
1200 ret = ttm_bo_validate(bo, placement, interruptible, false, false);
1204 ttm_bo_unreserve(bo);
1208 ttm_bo_unreserve(bo);
1213 EXPORT_SYMBOL(ttm_bo_init);
1215 static inline size_t ttm_bo_size(struct ttm_bo_global *glob,
1216 unsigned long num_pages)
1218 size_t page_array_size = (num_pages * sizeof(void *) + PAGE_SIZE - 1) &
1221 return glob->ttm_bo_size + 2 * page_array_size;
1224 int ttm_bo_create(struct ttm_bo_device *bdev,
1226 enum ttm_bo_type type,
1227 struct ttm_placement *placement,
1228 uint32_t page_alignment,
1229 unsigned long buffer_start,
1231 struct file *persistant_swap_storage,
1232 struct ttm_buffer_object **p_bo)
1234 struct ttm_buffer_object *bo;
1235 struct ttm_mem_global *mem_glob = bdev->glob->mem_glob;
1239 ttm_bo_size(bdev->glob, (size + PAGE_SIZE - 1) >> PAGE_SHIFT);
1240 ret = ttm_mem_global_alloc(mem_glob, acc_size, false, false);
1241 if (unlikely(ret != 0))
1244 bo = kzalloc(sizeof(*bo), GFP_KERNEL);
1246 if (unlikely(bo == NULL)) {
1247 ttm_mem_global_free(mem_glob, acc_size);
1251 ret = ttm_bo_init(bdev, bo, size, type, placement, page_alignment,
1252 buffer_start, interruptible,
1253 persistant_swap_storage, acc_size, NULL);
1254 if (likely(ret == 0))
1260 static int ttm_bo_force_list_clean(struct ttm_bo_device *bdev,
1261 unsigned mem_type, bool allow_errors)
1263 struct ttm_mem_type_manager *man = &bdev->man[mem_type];
1264 struct ttm_bo_global *glob = bdev->glob;
1268 * Can't use standard list traversal since we're unlocking.
1271 spin_lock(&glob->lru_lock);
1272 while (!list_empty(&man->lru)) {
1273 spin_unlock(&glob->lru_lock);
1274 ret = ttm_mem_evict_first(bdev, mem_type, false, false, false);
1279 printk(KERN_ERR TTM_PFX
1280 "Cleanup eviction failed\n");
1283 spin_lock(&glob->lru_lock);
1285 spin_unlock(&glob->lru_lock);
1289 int ttm_bo_clean_mm(struct ttm_bo_device *bdev, unsigned mem_type)
1291 struct ttm_bo_global *glob = bdev->glob;
1292 struct ttm_mem_type_manager *man;
1295 if (mem_type >= TTM_NUM_MEM_TYPES) {
1296 printk(KERN_ERR TTM_PFX "Illegal memory type %d\n", mem_type);
1299 man = &bdev->man[mem_type];
1301 if (!man->has_type) {
1302 printk(KERN_ERR TTM_PFX "Trying to take down uninitialized "
1303 "memory manager type %u\n", mem_type);
1307 man->use_type = false;
1308 man->has_type = false;
1312 ttm_bo_force_list_clean(bdev, mem_type, false);
1314 spin_lock(&glob->lru_lock);
1315 if (drm_mm_clean(&man->manager))
1316 drm_mm_takedown(&man->manager);
1320 spin_unlock(&glob->lru_lock);
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 if (type >= TTM_NUM_MEM_TYPES) {
1356 printk(KERN_ERR TTM_PFX "Illegal memory type %d\n", type);
1360 man = &bdev->man[type];
1361 if (man->has_type) {
1362 printk(KERN_ERR TTM_PFX
1363 "Memory manager already initialized for type %d\n",
1368 ret = bdev->driver->init_mem_type(bdev, type, man);
1373 if (type != TTM_PL_SYSTEM) {
1375 printk(KERN_ERR TTM_PFX
1376 "Zero size memory manager type %d\n",
1380 ret = drm_mm_init(&man->manager, 0, p_size);
1384 man->has_type = true;
1385 man->use_type = true;
1388 INIT_LIST_HEAD(&man->lru);
1392 EXPORT_SYMBOL(ttm_bo_init_mm);
1394 static void ttm_bo_global_kobj_release(struct kobject *kobj)
1396 struct ttm_bo_global *glob =
1397 container_of(kobj, struct ttm_bo_global, kobj);
1399 ttm_mem_unregister_shrink(glob->mem_glob, &glob->shrink);
1400 __free_page(glob->dummy_read_page);
1404 void ttm_bo_global_release(struct ttm_global_reference *ref)
1406 struct ttm_bo_global *glob = ref->object;
1408 kobject_del(&glob->kobj);
1409 kobject_put(&glob->kobj);
1411 EXPORT_SYMBOL(ttm_bo_global_release);
1413 int ttm_bo_global_init(struct ttm_global_reference *ref)
1415 struct ttm_bo_global_ref *bo_ref =
1416 container_of(ref, struct ttm_bo_global_ref, ref);
1417 struct ttm_bo_global *glob = ref->object;
1420 mutex_init(&glob->device_list_mutex);
1421 spin_lock_init(&glob->lru_lock);
1422 glob->mem_glob = bo_ref->mem_glob;
1423 glob->dummy_read_page = alloc_page(__GFP_ZERO | GFP_DMA32);
1425 if (unlikely(glob->dummy_read_page == NULL)) {
1430 INIT_LIST_HEAD(&glob->swap_lru);
1431 INIT_LIST_HEAD(&glob->device_list);
1433 ttm_mem_init_shrink(&glob->shrink, ttm_bo_swapout);
1434 ret = ttm_mem_register_shrink(glob->mem_glob, &glob->shrink);
1435 if (unlikely(ret != 0)) {
1436 printk(KERN_ERR TTM_PFX
1437 "Could not register buffer object swapout.\n");
1441 glob->ttm_bo_extra_size =
1442 ttm_round_pot(sizeof(struct ttm_tt)) +
1443 ttm_round_pot(sizeof(struct ttm_backend));
1445 glob->ttm_bo_size = glob->ttm_bo_extra_size +
1446 ttm_round_pot(sizeof(struct ttm_buffer_object));
1448 atomic_set(&glob->bo_count, 0);
1450 ret = kobject_init_and_add(
1451 &glob->kobj, &ttm_bo_glob_kobj_type, ttm_get_kobj(), "buffer_objects");
1452 if (unlikely(ret != 0))
1453 kobject_put(&glob->kobj);
1456 __free_page(glob->dummy_read_page);
1461 EXPORT_SYMBOL(ttm_bo_global_init);
1464 int ttm_bo_device_release(struct ttm_bo_device *bdev)
1467 unsigned i = TTM_NUM_MEM_TYPES;
1468 struct ttm_mem_type_manager *man;
1469 struct ttm_bo_global *glob = bdev->glob;
1472 man = &bdev->man[i];
1473 if (man->has_type) {
1474 man->use_type = false;
1475 if ((i != TTM_PL_SYSTEM) && ttm_bo_clean_mm(bdev, i)) {
1477 printk(KERN_ERR TTM_PFX
1478 "DRM memory manager type %d "
1479 "is not clean.\n", i);
1481 man->has_type = false;
1485 mutex_lock(&glob->device_list_mutex);
1486 list_del(&bdev->device_list);
1487 mutex_unlock(&glob->device_list_mutex);
1489 if (!cancel_delayed_work(&bdev->wq))
1490 flush_scheduled_work();
1492 while (ttm_bo_delayed_delete(bdev, true))
1495 spin_lock(&glob->lru_lock);
1496 if (list_empty(&bdev->ddestroy))
1497 TTM_DEBUG("Delayed destroy list was clean\n");
1499 if (list_empty(&bdev->man[0].lru))
1500 TTM_DEBUG("Swap list was clean\n");
1501 spin_unlock(&glob->lru_lock);
1503 BUG_ON(!drm_mm_clean(&bdev->addr_space_mm));
1504 write_lock(&bdev->vm_lock);
1505 drm_mm_takedown(&bdev->addr_space_mm);
1506 write_unlock(&bdev->vm_lock);
1510 EXPORT_SYMBOL(ttm_bo_device_release);
1512 int ttm_bo_device_init(struct ttm_bo_device *bdev,
1513 struct ttm_bo_global *glob,
1514 struct ttm_bo_driver *driver,
1515 uint64_t file_page_offset,
1520 rwlock_init(&bdev->vm_lock);
1521 bdev->driver = driver;
1523 memset(bdev->man, 0, sizeof(bdev->man));
1526 * Initialize the system memory buffer type.
1527 * Other types need to be driver / IOCTL initialized.
1529 ret = ttm_bo_init_mm(bdev, TTM_PL_SYSTEM, 0);
1530 if (unlikely(ret != 0))
1533 bdev->addr_space_rb = RB_ROOT;
1534 ret = drm_mm_init(&bdev->addr_space_mm, file_page_offset, 0x10000000);
1535 if (unlikely(ret != 0))
1536 goto out_no_addr_mm;
1538 INIT_DELAYED_WORK(&bdev->wq, ttm_bo_delayed_workqueue);
1539 bdev->nice_mode = true;
1540 INIT_LIST_HEAD(&bdev->ddestroy);
1541 bdev->dev_mapping = NULL;
1543 bdev->need_dma32 = need_dma32;
1545 mutex_lock(&glob->device_list_mutex);
1546 list_add_tail(&bdev->device_list, &glob->device_list);
1547 mutex_unlock(&glob->device_list_mutex);
1551 ttm_bo_clean_mm(bdev, 0);
1555 EXPORT_SYMBOL(ttm_bo_device_init);
1558 * buffer object vm functions.
1561 bool ttm_mem_reg_is_pci(struct ttm_bo_device *bdev, struct ttm_mem_reg *mem)
1563 struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
1565 if (!(man->flags & TTM_MEMTYPE_FLAG_FIXED)) {
1566 if (mem->mem_type == TTM_PL_SYSTEM)
1569 if (man->flags & TTM_MEMTYPE_FLAG_CMA)
1572 if (mem->placement & TTM_PL_FLAG_CACHED)
1578 void ttm_bo_unmap_virtual(struct ttm_buffer_object *bo)
1580 struct ttm_bo_device *bdev = bo->bdev;
1581 loff_t offset = (loff_t) bo->addr_space_offset;
1582 loff_t holelen = ((loff_t) bo->mem.num_pages) << PAGE_SHIFT;
1584 if (!bdev->dev_mapping)
1586 unmap_mapping_range(bdev->dev_mapping, offset, holelen, 1);
1587 ttm_mem_io_free(bdev, &bo->mem);
1589 EXPORT_SYMBOL(ttm_bo_unmap_virtual);
1591 static void ttm_bo_vm_insert_rb(struct ttm_buffer_object *bo)
1593 struct ttm_bo_device *bdev = bo->bdev;
1594 struct rb_node **cur = &bdev->addr_space_rb.rb_node;
1595 struct rb_node *parent = NULL;
1596 struct ttm_buffer_object *cur_bo;
1597 unsigned long offset = bo->vm_node->start;
1598 unsigned long cur_offset;
1602 cur_bo = rb_entry(parent, struct ttm_buffer_object, vm_rb);
1603 cur_offset = cur_bo->vm_node->start;
1604 if (offset < cur_offset)
1605 cur = &parent->rb_left;
1606 else if (offset > cur_offset)
1607 cur = &parent->rb_right;
1612 rb_link_node(&bo->vm_rb, parent, cur);
1613 rb_insert_color(&bo->vm_rb, &bdev->addr_space_rb);
1619 * @bo: the buffer to allocate address space for
1621 * Allocate address space in the drm device so that applications
1622 * can mmap the buffer and access the contents. This only
1623 * applies to ttm_bo_type_device objects as others are not
1624 * placed in the drm device address space.
1627 static int ttm_bo_setup_vm(struct ttm_buffer_object *bo)
1629 struct ttm_bo_device *bdev = bo->bdev;
1633 ret = drm_mm_pre_get(&bdev->addr_space_mm);
1634 if (unlikely(ret != 0))
1637 write_lock(&bdev->vm_lock);
1638 bo->vm_node = drm_mm_search_free(&bdev->addr_space_mm,
1639 bo->mem.num_pages, 0, 0);
1641 if (unlikely(bo->vm_node == NULL)) {
1646 bo->vm_node = drm_mm_get_block_atomic(bo->vm_node,
1647 bo->mem.num_pages, 0);
1649 if (unlikely(bo->vm_node == NULL)) {
1650 write_unlock(&bdev->vm_lock);
1654 ttm_bo_vm_insert_rb(bo);
1655 write_unlock(&bdev->vm_lock);
1656 bo->addr_space_offset = ((uint64_t) bo->vm_node->start) << PAGE_SHIFT;
1660 write_unlock(&bdev->vm_lock);
1664 int ttm_bo_wait(struct ttm_buffer_object *bo,
1665 bool lazy, bool interruptible, bool no_wait)
1667 struct ttm_bo_driver *driver = bo->bdev->driver;
1672 if (likely(bo->sync_obj == NULL))
1675 while (bo->sync_obj) {
1677 if (driver->sync_obj_signaled(bo->sync_obj, bo->sync_obj_arg)) {
1678 void *tmp_obj = bo->sync_obj;
1679 bo->sync_obj = NULL;
1680 clear_bit(TTM_BO_PRIV_FLAG_MOVING, &bo->priv_flags);
1681 spin_unlock(&bo->lock);
1682 driver->sync_obj_unref(&tmp_obj);
1683 spin_lock(&bo->lock);
1690 sync_obj = driver->sync_obj_ref(bo->sync_obj);
1691 sync_obj_arg = bo->sync_obj_arg;
1692 spin_unlock(&bo->lock);
1693 ret = driver->sync_obj_wait(sync_obj, sync_obj_arg,
1694 lazy, interruptible);
1695 if (unlikely(ret != 0)) {
1696 driver->sync_obj_unref(&sync_obj);
1697 spin_lock(&bo->lock);
1700 spin_lock(&bo->lock);
1701 if (likely(bo->sync_obj == sync_obj &&
1702 bo->sync_obj_arg == sync_obj_arg)) {
1703 void *tmp_obj = bo->sync_obj;
1704 bo->sync_obj = NULL;
1705 clear_bit(TTM_BO_PRIV_FLAG_MOVING,
1707 spin_unlock(&bo->lock);
1708 driver->sync_obj_unref(&sync_obj);
1709 driver->sync_obj_unref(&tmp_obj);
1710 spin_lock(&bo->lock);
1712 spin_unlock(&bo->lock);
1713 driver->sync_obj_unref(&sync_obj);
1714 spin_lock(&bo->lock);
1719 EXPORT_SYMBOL(ttm_bo_wait);
1721 void ttm_bo_unblock_reservation(struct ttm_buffer_object *bo)
1723 atomic_set(&bo->reserved, 0);
1724 wake_up_all(&bo->event_queue);
1727 int ttm_bo_block_reservation(struct ttm_buffer_object *bo, bool interruptible,
1732 while (unlikely(atomic_cmpxchg(&bo->reserved, 0, 1) != 0)) {
1735 else if (interruptible) {
1736 ret = wait_event_interruptible
1737 (bo->event_queue, atomic_read(&bo->reserved) == 0);
1738 if (unlikely(ret != 0))
1741 wait_event(bo->event_queue,
1742 atomic_read(&bo->reserved) == 0);
1748 int ttm_bo_synccpu_write_grab(struct ttm_buffer_object *bo, bool no_wait)
1753 * Using ttm_bo_reserve instead of ttm_bo_block_reservation
1754 * makes sure the lru lists are updated.
1757 ret = ttm_bo_reserve(bo, true, no_wait, false, 0);
1758 if (unlikely(ret != 0))
1760 spin_lock(&bo->lock);
1761 ret = ttm_bo_wait(bo, false, true, no_wait);
1762 spin_unlock(&bo->lock);
1763 if (likely(ret == 0))
1764 atomic_inc(&bo->cpu_writers);
1765 ttm_bo_unreserve(bo);
1768 EXPORT_SYMBOL(ttm_bo_synccpu_write_grab);
1770 void ttm_bo_synccpu_write_release(struct ttm_buffer_object *bo)
1772 if (atomic_dec_and_test(&bo->cpu_writers))
1773 wake_up_all(&bo->event_queue);
1775 EXPORT_SYMBOL(ttm_bo_synccpu_write_release);
1778 * A buffer object shrink method that tries to swap out the first
1779 * buffer object on the bo_global::swap_lru list.
1782 static int ttm_bo_swapout(struct ttm_mem_shrink *shrink)
1784 struct ttm_bo_global *glob =
1785 container_of(shrink, struct ttm_bo_global, shrink);
1786 struct ttm_buffer_object *bo;
1789 uint32_t swap_placement = (TTM_PL_FLAG_CACHED | TTM_PL_FLAG_SYSTEM);
1791 spin_lock(&glob->lru_lock);
1792 while (ret == -EBUSY) {
1793 if (unlikely(list_empty(&glob->swap_lru))) {
1794 spin_unlock(&glob->lru_lock);
1798 bo = list_first_entry(&glob->swap_lru,
1799 struct ttm_buffer_object, swap);
1800 kref_get(&bo->list_kref);
1803 * Reserve buffer. Since we unlock while sleeping, we need
1804 * to re-check that nobody removed us from the swap-list while
1808 ret = ttm_bo_reserve_locked(bo, false, true, false, 0);
1809 if (unlikely(ret == -EBUSY)) {
1810 spin_unlock(&glob->lru_lock);
1811 ttm_bo_wait_unreserved(bo, false);
1812 kref_put(&bo->list_kref, ttm_bo_release_list);
1813 spin_lock(&glob->lru_lock);
1818 put_count = ttm_bo_del_from_lru(bo);
1819 spin_unlock(&glob->lru_lock);
1822 kref_put(&bo->list_kref, ttm_bo_ref_bug);
1825 * Wait for GPU, then move to system cached.
1828 spin_lock(&bo->lock);
1829 ret = ttm_bo_wait(bo, false, false, false);
1830 spin_unlock(&bo->lock);
1832 if (unlikely(ret != 0))
1835 if ((bo->mem.placement & swap_placement) != swap_placement) {
1836 struct ttm_mem_reg evict_mem;
1838 evict_mem = bo->mem;
1839 evict_mem.mm_node = NULL;
1840 evict_mem.placement = TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED;
1841 evict_mem.mem_type = TTM_PL_SYSTEM;
1843 ret = ttm_bo_handle_move_mem(bo, &evict_mem, true,
1844 false, false, false);
1845 if (unlikely(ret != 0))
1849 ttm_bo_unmap_virtual(bo);
1852 * Swap out. Buffer will be swapped in again as soon as
1853 * anyone tries to access a ttm page.
1856 if (bo->bdev->driver->swap_notify)
1857 bo->bdev->driver->swap_notify(bo);
1859 ret = ttm_tt_swapout(bo->ttm, bo->persistant_swap_storage);
1864 * Unreserve without putting on LRU to avoid swapping out an
1865 * already swapped buffer.
1868 atomic_set(&bo->reserved, 0);
1869 wake_up_all(&bo->event_queue);
1870 kref_put(&bo->list_kref, ttm_bo_release_list);
1874 void ttm_bo_swapout_all(struct ttm_bo_device *bdev)
1876 while (ttm_bo_swapout(&bdev->glob->shrink) == 0)
1879 EXPORT_SYMBOL(ttm_bo_swapout_all);