[PATCH 1/2] drm/amdgpu: Enable scatter gather display support

[Michel Dänzer]

On 2018-03-06 07:02 PM, Christian König wrote:
> Am 06.03.2018 um 18:51 schrieb Michel Dänzer:
>> On 2018-03-06 06:44 PM, Christian König wrote:
>>> Am 06.03.2018 um 18:22 schrieb Li, Samuel:
>>>>> addition to that I agree with Michel that the module parameter is
>>>>> overkill.
>>>> That I already explained. Currently SG display feature needs to
>>>> provide options for all kinds of use cases. All amd drivers so far
>>>> provides options, and the default configuration is actually to
>>>> allocate everything from GTT when possible.
>>> That isn't job of the kernel to have this parameter. Saying that we
>>> should probably add a DDX and/or environment option to control that.
>> Why would we need that? It's the kernel driver's job to handle this as
>> needed.
> 
> Buffer placement is specified by the DDX/Mesa, when we override that in
> the kernel we just force unnecessary buffer moves.

Userspace just needs a way to know which domains can/should be used for
scanout buffers, e.g. via an info ioctl.


-- 
Earthling Michel Dänzer               |               http://www.amd.com
Libre software enthusiast             |             Mesa and X developer