[pull] amdgpu, amdkfd drm-next-5.8

Daniel Stone daniel at fooishbar.org
Thu May 14 14:13:22 UTC 2020


On Thu, 14 May 2020 at 14:36, Alex Deucher <alexdeucher at gmail.com> wrote:
> On Thu, May 14, 2020 at 5:42 AM Daniel Stone <daniel at fooishbar.org> wrote:
> > Did this ever go through uAPI review? It's been pushed to the kernel
> > before Mesa review was complete. Even then, Mesa only uses it when
> > behind a magic environment variable, rather than through the EGL
> > extensions which have been specifically designed for protected content
> > (EGL_EXT_protected_content, protected_surface, etc). The winsys
> > usecase was based on a Wayland system which seems like it will only
> > work when composition bypass is available - not using any of the
> > Wayland protected-content extensions, and it's completely unclear what
> > will happen if composition bypass can't actually be achieved.
> >
> > I don't think this should be landing before all those open questions
> > have been answered. We're trying to come up with a good and coherent
> > story for handling protected content, and I'd rather not see AMD
> > landing its own uAPI which might completely contradict that.
> Well, the patches have been public for months and we have a UAPI and
> mesa userspace which works for our use cases and the mesa side has
> been merged and the recent comments on the MR didn't seem like show
> stoppers.

As a generic compositor author, it's pretty important for me to
understand what happens when trying to access protected content. Does
the import simply fail? Does it sample rubbish? Does my context
killed? etc.

> I don't disagree with your point, but I feel like agreeing
> on a what we want to do for EGL protected content could drag out for
> months or years.

I don't really see what the problem is, but it would've been nice if
it was at least attempted, rather than just parachuted in ... I know
I'm going to end up getting bug reports about it for Wayland/Weston,
and then all of a sudden it's become my problem that this was just
dropped in as a vendor-specific feature in a vendor-specific island.


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