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

[Christian König]

Am 21.03.2018 um 06:08 schrieb Marek Olšák:
> On Tue, Mar 20, 2018 at 4:16 PM, Christian König 
> <christian.koenig at amd.com <mailto:christian.koenig at amd.com>> wrote:
>
>     That's what I meant with use up the otherwise unused VRAM. I don't
>     see any disadvantage of always setting GTT as second domain on APUs.
>
>     My assumption was that we dropped this in userspace for
>     displayable surfaces, but Marek proved that wrong.
>
>     So what we should do is actually to add GTT as fallback to all BOs
>     on APUs in Mesa and only make sure that the kernel is capable of
>     handling GTT with optimal performance (e.g. have user huge pages
>     etc..).
>
>
> VRAM|GTT is practically as good as GTT. VRAM with BO priorities and 
> eviction throttling is the true "VRAM|GTT".
>
> I don't know how else to make use of VRAM intelligently.

Well why not set VRAM|GTT as default on APUs? That should still save 
quite a bunch of moves even with throttling.

I mean there really shouldn't be any advantage to use VRAM any more 
except that we want to use it up as long as it is available.

Christian.

>
> Marek
>
>
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