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Subject[PATCH 2/2] drm/ttm: once more fix ttm_bo_bulk_move_lru_tail v2
Date
While cutting the lists we sometimes accidentally added a list_head from
the stack to the LRUs, effectively corrupting the list.

Remove the list cutting and use explicit list manipulation instead.

v2: separate out new list_bulk_move_tail helper

Signed-off-by: Christian König <christian.koenig@amd.com>
---
drivers/gpu/drm/ttm/ttm_bo.c | 46 +++++++++++++++++++-------------------------
1 file changed, 20 insertions(+), 26 deletions(-)

diff --git a/drivers/gpu/drm/ttm/ttm_bo.c b/drivers/gpu/drm/ttm/ttm_bo.c
index 138c98902033..26b889f86670 100644
--- a/drivers/gpu/drm/ttm/ttm_bo.c
+++ b/drivers/gpu/drm/ttm/ttm_bo.c
@@ -247,47 +247,38 @@ void ttm_bo_move_to_lru_tail(struct ttm_buffer_object *bo,
}
EXPORT_SYMBOL(ttm_bo_move_to_lru_tail);

-static void ttm_bo_bulk_move_helper(struct ttm_lru_bulk_move_pos *pos,
- struct list_head *lru, bool is_swap)
-{
- struct list_head *list;
- LIST_HEAD(entries);
- LIST_HEAD(before);
-
- reservation_object_assert_held(pos->last->resv);
- list = is_swap ? &pos->last->swap : &pos->last->lru;
- list_cut_position(&entries, lru, list);
-
- reservation_object_assert_held(pos->first->resv);
- list = is_swap ? pos->first->swap.prev : pos->first->lru.prev;
- list_cut_position(&before, &entries, list);
-
- list_splice(&before, lru);
- list_splice_tail(&entries, lru);
-}
-
void ttm_bo_bulk_move_lru_tail(struct ttm_lru_bulk_move *bulk)
{
unsigned i;

for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i) {
+ struct ttm_lru_bulk_move_pos *pos = &bulk->tt[i];
struct ttm_mem_type_manager *man;

- if (!bulk->tt[i].first)
+ if (!pos->first)
continue;

- man = &bulk->tt[i].first->bdev->man[TTM_PL_TT];
- ttm_bo_bulk_move_helper(&bulk->tt[i], &man->lru[i], false);
+ reservation_object_assert_held(pos->first->resv);
+ reservation_object_assert_held(pos->last->resv);
+
+ man = &pos->first->bdev->man[TTM_PL_TT];
+ list_bulk_move_tail(&man->lru[i], &pos->first->lru,
+ &pos->last->lru);
}

for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i) {
+ struct ttm_lru_bulk_move_pos *pos = &bulk->vram[i];
struct ttm_mem_type_manager *man;

- if (!bulk->vram[i].first)
+ if (!pos->first)
continue;

- man = &bulk->vram[i].first->bdev->man[TTM_PL_VRAM];
- ttm_bo_bulk_move_helper(&bulk->vram[i], &man->lru[i], false);
+ reservation_object_assert_held(pos->first->resv);
+ reservation_object_assert_held(pos->last->resv);
+
+ man = &pos->first->bdev->man[TTM_PL_VRAM];
+ list_bulk_move_tail(&man->lru[i], &pos->first->lru,
+ &pos->last->lru);
}

for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i) {
@@ -297,8 +288,11 @@ void ttm_bo_bulk_move_lru_tail(struct ttm_lru_bulk_move *bulk)
if (!pos->first)
continue;

+ reservation_object_assert_held(pos->first->resv);
+ reservation_object_assert_held(pos->last->resv);
+
lru = &pos->first->bdev->glob->swap_lru[i];
- ttm_bo_bulk_move_helper(&bulk->swap[i], lru, true);
+ list_bulk_move_tail(lru, &pos->first->swap, &pos->last->swap);
}
}
EXPORT_SYMBOL(ttm_bo_bulk_move_lru_tail);
--
2.14.1
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