[Intel-gfx] [PATCH 2/3] drm/i915/guc: downgrade some DRM_ERROR() messages to DRM_WARN()

[Tvrtko Ursulin]

On 12/07/16 10:27, Chris Wilson wrote:
> On Tue, Jul 12, 2016 at 10:20:43AM +0100, Tvrtko Ursulin wrote:
>> On 11/07/16 19:01, Dave Gordon wrote:
>>> @@ -553,8 +551,8 @@ static int guc_ring_doorbell(struct i915_guc_client *gc)
>>>   		if (db_ret.db_status == GUC_DOORBELL_DISABLED)
>>>   			break;
>>>
>>> -		DRM_ERROR("Cookie mismatch. Expected %d, returned %d\n",
>>> -			  db_cmp.cookie, db_ret.cookie);
>>> +		DRM_WARN("Cookie mismatch. Expected %d, found %d\n",
>>> +			 db_cmp.cookie, db_ret.cookie);
>>
>> This one is interesting, error is propagated out a bit but then
>> ignored in actual command submission.
>>
>> If the above message means command will not be submitted error is
>> probably more appropriate. Or perhaps we cannot tell if the command
>> was submitted or not in this case?
>
> It's insignificant. An actual error would result in a GPU hang, and
> without being recorded in the error state any message here is useless.

I don't agree that it is useless, if it is a very unexpected situation 
it deserves to be logged. People do store and look at logs when things 
go bad.

Regards,

Tvrtko