Re: [PATCH v5 00/24] AMDKFD Kernel Driver

Dave Airlie
2014-11-10T21:16:27Z

>> How does amdkfd interfact with runtime pm on the radeon driver? I'd expect
>> some calls to the runtime get/put functions in some places.
>>
>> Dave.
>>
> Hi Dave,
> Per Jerome's request from the first time he saw the driver, we removed all
> the "register bashing" code from amdkfd and moved them to the interface file
> between amdkfd and radeon, which is part of the radeon driver.
> See "[PATCH v5 05/24] drm/radeon: Add radeon <--> amdkfd interface" for the
> implementation of that interface file.

So in GPU offload mode, how does amdkfd wake the GPU up to execute
stuff?

GPU offload is where the radeon GPU is a secondary GPU and we power it
down automatically.

Granted I think our powerdown should probably check if the GPU is executing
anything a bit more, but I don't think amdkfd can even wake it up to submit
work at the moment.

Dave.