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

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Date:	Tue, 11 Nov 2014 07:16:23 +1000
From:	Dave Airlie <airlied@...il.com>
To:	Oded Gabbay <oded.gabbay@....com>
Cc:	David Airlie <airlied@...ux.ie>,
	Alex Deucher <alexander.deucher@....com>,
	Jerome Glisse <j.glisse@...il.com>,
	LKML <linux-kernel@...r.kernel.org>,
	dri-devel <dri-devel@...ts.freedesktop.org>
Subject: Re: [PATCH v5 00/24] AMDKFD Kernel Driver

>> 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.
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