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

[Marek Olšák]

On Mon, Mar 19, 2018 at 4:53 PM, Alex Deucher <alexdeucher at gmail.com> wrote:

> On Mon, Mar 19, 2018 at 4:26 PM, Marek Olšák <maraeo at gmail.com> wrote:
> > When Mesa wants a buffer in VRAM, it always sets VRAM. It relies on BO
> move
> > throttling to prevent unnecessary BO moves.
> >
> > My questions are:
> > - what should Mesa do differently for tiny VRAM?
> > - what is a tiny VRAM?
> > - if VRAM is tiny, which allocations should we put there?
>
> Right now, all mesa would have to do is query the kernel to see if the
> device supports s/g display.  If it does, it can do whatever makes
> sense in the long term once we've had more time to benchmark, etc.,
> but to start off with, I'd say just make it GTT or VRAM|GTT.
> Otherwise we have the kernel second guessing mesa and I'd like to
> avoid that.  I want the kernel to respect that userspace asks for as
> much as possible.
>

Sounds good.

Marek
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