Making a GDS Allocation for NGG

[Jakub Okoński]

Hey Jian-Rong,

Will gfx9 get support from KMD and LLPC by the time gfx10 releases, or is
it only going to be a gfx10-and-forward feature?

If not, is there something missing in gfx9 hardware? Are you allowed to say?

Thanks,
Jakub

On Wed, 15 Aug 2018 at 08:36 Jin, Jian-Rong <Jian-Rong.Jin at amd.com> wrote:

> Hi Jakub。
> Both KMD and LLPC are not ready to support NGG for gfx9. We are going to
> support NGG in amdvlk for next generation GPU.
>
> Thanks
> Jian-Rong JIN
>
> -----Original Message-----
> From: amd-gfx <amd-gfx-bounces at lists.freedesktop.org> On Behalf Of Jakub
> Okoński
> Sent: 2018年8月14日 21:31
> To: amd-gfx at lists.freedesktop.org
> Subject: Making a GDS Allocation for NGG
>
> Hi folks,
>
> I was trying to play around with NGG on Vega using the open source AMDVLK
> stack.
> After fetching all the code, I disabled an override in PAL, under
> gfx9SettingsLoader.cpp that disables the NGG setting. I've put a new option
> in my
> amdPalSettings.cfg: `NggMode,7` and that was enough to enable it.
>
> When I ran a small vulkan application, it crashed with a "Not implemented"
> error in Pal::Linux::Device::AllocateGds. The comment there says:
>
>     // TODO: implement it once amdgpu is ready.
>
> I couldn't find anything specific to GDS allocation in upstream kernel, so
> I looked at agd5f/amd-staging-drm-next and found some code related to
> AMDGPU_GEM_DOMAIN_GDS and allocating a bo object. This is in
> amdgpu_gem_create_ioctl, so I think it's accessible to userspace, with a
> small change in libdrm, probably.
>
> Is this what is needed to make a GDS allocation that NGG would accept, or
> is it unrelated? Do you know if there are any other blockers for NGG
> besides this?
>
> Regards,
> Jakub
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