On 4/12/19 3:40 AM, Christian König wrote:
> Am 11.04.19 um 18:03 schrieb Andrey Grodzovsky:
>> Patch '5edb0c9b Fix deadlock with display during hanged ring recovery'
>> was accidentaly removed during one of DALs code merges.
>>
>> Signed-off-by: Andrey Grodzovsky <andrey.grodzovsky@xxxxxxx>
>> ---
>> drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 19
>> +++++++++++++------
>> 1 file changed, 13 insertions(+), 6 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
>> b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
>> index 0648794..27e0383 100644
>> --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
>> +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
>> @@ -5138,14 +5138,21 @@ 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);
>> - }
>
> I also already suggested to completely stop waiting while the BO is
> being reserved, but looks like that got dropped as well.
>
> I would say something is seriously wrong with DALs development process
> here.
>
> Christian.
Yea, I think your patch that moved the wait out of the reserved section
got dropped as well, when I re spin the series with your comments for
the TDR stuff I will also add a patch restoring your change.
Andrey
>
>> - /* 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);
>
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