[PATCH 2/2] drm/amdgpu: add AMDGPURESET uevent on AMD GPU reset

[Christian König]

Am 17.01.22 um 12:43 schrieb Sharma, Shashank:
> Hello Christian,
>
> On 1/17/2022 11:37 AM, Christian König wrote:
>> Am 17.01.22 um 11:34 schrieb Somalapuram, Amaranath:
>>> [SNIP]
>>> Any suggestion how we can notify user space during this situation. 
>>
>> Well trace points should work. They use a ring buffer and are 
>> specially made to work in such situations.
>
> We are anyways sending a trace event with data, but can trace event be 
> a wake up source for an application (like a tracer) ? This DRM event 
> is just to indicate that reset happened, so app has to read from trace 
> file.

Yeah, that's a really good question I can't fully answer. As far as I 
know you can filter in userspace what you get from the tracer, but I 
don't know if you can block on a specific event.

Christian.

>
>>
>> Alternative would be to audit the udev code and allow giving a GFP 
>> mask to the function to make sure that we don't run into the deadlock.
>>
>> Another alternative is a debugfs file which just blocks for the next 
>> reset to happen.
>>
>
> - Shashank
>
>> Regards,
>> Christian.
>>
>>> Regards,
>>>
>>> S.Amarnath
>>>
>>