Am 13.09.2018 um 16:25 schrieb Alex Deucher:
On Wed, Sep 12, 2018 at 3:25 PM Christian König
<[email protected]> wrote:
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.
Signed-off-by: Christian König <[email protected]>
Can you apply this patch first and then do the clean up as a later
series or temporarily disable the feature? I want to send out a -next
pull this week and I don't want to leave this broken.
Yeah, that should work as well.
Christian.
Alex
---
drivers/gpu/drm/ttm/ttm_bo.c | 51 ++++++++++++++++++++++++++------------------
1 file changed, 30 insertions(+), 21 deletions(-)
diff --git a/drivers/gpu/drm/ttm/ttm_bo.c b/drivers/gpu/drm/ttm/ttm_bo.c
index 138c98902033..b2a33bf1ef10 100644
--- a/drivers/gpu/drm/ttm/ttm_bo.c
+++ b/drivers/gpu/drm/ttm/ttm_bo.c
@@ -247,23 +247,18 @@ 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)
+static void ttm_list_move_bulk_tail(struct list_head *list,
+ struct list_head *first,
+ struct list_head *last)
{
- struct list_head *list;
- LIST_HEAD(entries);
- LIST_HEAD(before);
+ first->prev->next = last->next;
+ last->next->prev = first->prev;
- reservation_object_assert_held(pos->last->resv);
- list = is_swap ? &pos->last->swap : &pos->last->lru;
- list_cut_position(&entries, lru, list);
+ list->prev->next = first;
+ first->prev = list->prev;
- 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);
+ last->next = list;
+ list->prev = last;
}
void ttm_bo_bulk_move_lru_tail(struct ttm_lru_bulk_move *bulk)
@@ -271,23 +266,33 @@ 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];
+ ttm_list_move_bulk_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];
+ ttm_list_move_bulk_tail(&man->lru[i], &pos->first->lru,
+ &pos->last->lru);
}
for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i) {
@@ -297,8 +302,12 @@ 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);
+ ttm_list_move_bulk_tail(lru, &pos->first->swap,
+ &pos->last->swap);
}
}
EXPORT_SYMBOL(ttm_bo_bulk_move_lru_tail);
--
2.14.1
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