The flag is set by the kernel when it detects that contiguous VRAM is
necessary by because of some hardware restriction. It should never be
set by userspace manually.
I've added giant page optimizations as a best effort handling which
atomatically kicks in when enough VRAM is available. If VRAM is
fragmented we fall back to huge page allocations.
Regards,
Christian.
Am 08.12.20 um 11:28 schrieb Chen Lei:
Hi! I am not quite familiar with it, and I was wondering why this flag is blocked. As the VM subsystem supports giant pages, it might be useful to add this flag in amdgpu_gem_create_ioctl.
> -----原始邮件-----
> 发件人: "Christian König" <ckoenig.leichtzumerken@xxxxxxxxx>
> 发送时间: 2020-12-08 15:41:02 (星期二)
> 收件人: "Chen Lei" <chenlei18s@xxxxxxxxx>, alexander.deucher@xxxxxxx, christian.koenig@xxxxxxx
> 抄送: amd-gfx@xxxxxxxxxxxxxxxxxxxxx
> 主题: Re: [PATCH] drm/amdgpu: add the missing AMDGPU_GEM_CREATE_VRAM_CONTIGUOUS flag
>
> Am 08.12.20 um 03:50 schrieb Chen Lei:
> > Add the AMDGPU_GEM_CREATE_VRAM_CONTIGUOUS flag in amdgpu_gem_create_ioctl.
> >
> > Signed-off-by: Chen Lei <chenlei18s@xxxxxxxxx>
>
> NAK, that is not missing but intentionally blocked.
>
> Christian.
>
> > ---
> > drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c | 1 +
> > 1 file changed, 1 insertion(+)
> >
> > diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c
> > index 7e8265da9..da18aeff7 100644
> > --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c
> > +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c
> > @@ -233,6 +233,7 @@ int amdgpu_gem_create_ioctl(struct drm_device *dev, void *data,
> > AMDGPU_GEM_CREATE_NO_CPU_ACCESS |
> > AMDGPU_GEM_CREATE_CPU_GTT_USWC |
> > AMDGPU_GEM_CREATE_VRAM_CLEARED |
> > + AMDGPU_GEM_CREATE_VRAM_CONTIGUOUS |
> > AMDGPU_GEM_CREATE_VM_ALWAYS_VALID |
> > AMDGPU_GEM_CREATE_EXPLICIT_SYNC |
> > AMDGPU_GEM_CREATE_ENCRYPTED))
</chenlei18s@xxxxxxxxx></chenlei18s@xxxxxxxxx></ckoenig.leichtzumerken@xxxxxxxxx>
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