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list: introduce list_bulk_move_tail helper 

Move all entries between @first and including @last before @head.

This is useful for LRU lists where a whole block of entries should be
moved to the end of the list.

Used as a band aid in TTM, but better placed in the common list headers.

Acked-by: Dave Airlie <airlied@redhat.com>
Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Huang Rui <ray.huang@amd.com>
Reviewed-by: Junwei Zhang <Jerry.Zhang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Christian König 2018-09-13 11:17:23 +02:00 committed by Alex Deucher
parent a553c19d15
commit df2fc43d09
2 changed files with 28 additions and 20 deletions
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25
drivers/gpu/drm/ttm/ttm_bo.c
View File

@ -247,20 +247,6 @@ void ttm_bo_move_to_lru_tail(struct ttm_buffer_object *bo,
}
EXPORT_SYMBOL(ttm_bo_move_to_lru_tail);
static void ttm_list_move_bulk_tail(struct list_head *list,
struct list_head *first,
struct list_head *last)
{
first->prev->next = last->next;
last->next->prev = first->prev;
list->prev->next = first;
first->prev = list->prev;
last->next = list;
list->prev = last;
}
void ttm_bo_bulk_move_lru_tail(struct ttm_lru_bulk_move *bulk)
{
unsigned i;
@ -276,8 +262,8 @@ void ttm_bo_bulk_move_lru_tail(struct ttm_lru_bulk_move *bulk)
reservation_object_assert_held(pos->last->resv);
man = &pos->first->bdev->man[TTM_PL_TT];
ttm_list_move_bulk_tail(&man->lru[i], &pos->first->lru,
&pos->last->lru);
list_bulk_move_tail(&man->lru[i], &pos->first->lru,
&pos->last->lru);
}
for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i) {
@ -291,8 +277,8 @@ void ttm_bo_bulk_move_lru_tail(struct ttm_lru_bulk_move *bulk)
reservation_object_assert_held(pos->last->resv);
man = &pos->first->bdev->man[TTM_PL_VRAM];
ttm_list_move_bulk_tail(&man->lru[i], &pos->first->lru,
&pos->last->lru);
list_bulk_move_tail(&man->lru[i], &pos->first->lru,
&pos->last->lru);
}
for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i) {
@ -306,8 +292,7 @@ void ttm_bo_bulk_move_lru_tail(struct ttm_lru_bulk_move *bulk)
reservation_object_assert_held(pos->last->resv);
lru = &pos->first->bdev->glob->swap_lru[i];
ttm_list_move_bulk_tail(lru, &pos->first->swap,
&pos->last->swap);
list_bulk_move_tail(lru, &pos->first->swap, &pos->last->swap);
}
}
EXPORT_SYMBOL(ttm_bo_bulk_move_lru_tail);

23
include/linux/list.h
View File

@ -183,6 +183,29 @@ static inline void list_move_tail(struct list_head *list,
list_add_tail(list, head);
}
/**
* list_bulk_move_tail - move a subsection of a list to its tail
* @head: the head that will follow our entry
* @first: first entry to move
* @last: last entry to move, can be the same as first
*
* Move all entries between @first and including @last before @head.
* All three entries must belong to the same linked list.
*/
static inline void list_bulk_move_tail(struct list_head *head,
struct list_head *first,
struct list_head *last)
{
first->prev->next = last->next;
last->next->prev = first->prev;
head->prev->next = first;
first->prev = head->prev;
last->next = head;
head->prev = last;
}
/**
* list_is_last - tests whether @list is the last entry in list @head
* @list: the entry to test