Am 05.11.21 um 19:13 schrieb Daniel Vetter:
On Thu, Nov 04, 2021 at 12:44:34PM -0400, Harry Wentland wrote:
+Nick
It looks to be the old drm_plane_state->fb holds that reference. See dm_plane_helper_cleanup_fb() in amdgpu_dm.c.
Yup plane state holds reference for its entire existing (well this holds
in general as design principle for atomic state structs, just makes life
easier). And the plane state is guaranteed to exist from when we first pin
(prepare_fb plane hook) to when it's getting unpinned (cleanup_fb plane
hook).
Out of curiosity, what's blowing up?
The TTM pin count warning. What happens is that we try to free up a BO
while it is still being pinned.
My best guess is that some DMA-buf client is doing something wrong, but
it could of course also be that the BO was pinned for scanout.
Christian.
-Daniel
Harry
On 2021-11-04 08:51, Christian König wrote:
Hi guys,
adding the usual suspects which might know that of hand: When we do a KMS page flip, who keeps the reference to the BO while it is scanned out?
We are running into warning backtraces from TTM which look more than odd.
Thanks,
Christian.
