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-boun...@lists.freedesktop.org> On Behalf Of Jakub Okoński
Sent: 2018年8月14日 21:31
To: amd-gfx@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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