[PATCH 2/4] drm/amdgpu:new method to sync ce&de

[Liu, Monk]

Yeah, CPC cannot use constant engine.

BR Monk

-----Original Message-----
From: Marek Olšák [mailto:maraeo at gmail.com] 
Sent: Tuesday, September 06, 2016 3:13 AM
To: Deucher, Alexander <Alexander.Deucher at amd.com>
Cc: Christian König <deathsimple at vodafone.de>; Liu, Monk <Monk.Liu at amd.com>; amd-gfx at lists.freedesktop.org
Subject: Re: [PATCH 2/4] drm/amdgpu:new method to sync ce&de

On Mon, Aug 29, 2016 at 3:37 PM, Deucher, Alexander <Alexander.Deucher at amd.com> wrote:
>> -----Original Message-----
>> From: amd-gfx [mailto:amd-gfx-bounces at lists.freedesktop.org] On 
>> Behalf Of Christian König
>> Sent: Monday, August 29, 2016 4:25 AM
>> To: Liu, Monk; amd-gfx at lists.freedesktop.org
>> Subject: Re: [PATCH 2/4] drm/amdgpu:new method to sync ce&de
>>
>> Hui what?
>>
>> It feels like a hundred times I asked if the compute engine has a CE 
>> as well, but so far the answer was always No. That would explain a 
>> whole bunch of problems we had with the compute rings as well.
>
> Can we get some clarification?  I doesn't have a dedicated CE as far as I know.  Can the CE be used in conjunction with MEC as well as the PFP/ME?

From the CP program spec, CE can only be used with DE and DE = CP.ME.
Also, CE is described in the Kernel Graphics Queue section. There is no mention of CE in the compute sections.

Thus, compute IBs can't be paired with CE IBs.

Marek