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drm/amd/display: Fix deadlock with display during hanged ring recovery. 

When ring hang happens amdgpu_dm_commit_planes during flip is holding
the BO reserved and then stack waiting for fences to signal in
reservation_object_wait_timeout_rcu (which won't signal because there
was a hnag). Then when we try to shutdown display block during reset
recovery from drm_atomic_helper_suspend we also try to reserve the BO
from dm_plane_helper_cleanup_fb ending in deadlock.
Also remove useless WARN_ON

Signed-off-by: Andrey Grodzovsky <andrey.grodzovsky@amd.com>
Reviewed-by: Nicholas Kazlauskas <nicholas.kazlauskas@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Andrey Grodzovsky 2019-02-13 13:53:45 -05:00 committed by Alex Deucher
parent c0d9271ecb
commit f7c8930d9e
1 changed files with 13 additions and 6 deletions
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19
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
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@ -4698,14 +4698,21 @@ static void amdgpu_dm_commit_planes(struct drm_atomic_state *state,
*/
abo = gem_to_amdgpu_bo(fb->obj[0]);
r = amdgpu_bo_reserve(abo, true);
if (unlikely(r != 0)) {
if (unlikely(r != 0))
DRM_ERROR("failed to reserve buffer before flip\n");
WARN_ON(1);
}
/* Wait for all fences on this FB */
WARN_ON(reservation_object_wait_timeout_rcu(abo->tbo.resv, true, false,
MAX_SCHEDULE_TIMEOUT) < 0);
/*
* Wait for all fences on this FB. Do limited wait to avoid
* deadlock during GPU reset when this fence will not signal
* but we hold reservation lock for the BO.
*/
r = reservation_object_wait_timeout_rcu(abo->tbo.resv,
true, false,
msecs_to_jiffies(5000));
if (unlikely(r == 0))
DRM_ERROR("Waiting for fences timed out.");
amdgpu_bo_get_tiling_flags(abo, &tiling_flags);