Re: [git pull] drm for 5.8-rc1

[Thierry Reding <thierry.reding@gmail.com>]

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On Wed, Aug 12, 2020 at 12:43:17PM +0200, Karol Herbst wrote:
> On Wed, Aug 12, 2020 at 12:27 PM Karol Herbst <kherbst@redhat.com> wrote:
> >
> > On Wed, Aug 12, 2020 at 2:19 AM James Jones <jajones@nvidia.com> wrote:
> > >
> > > Sorry for the slow reply here as well.  I've been in the process of
> > > rebasing and reworking the userspace patches.  I'm not clear my changes
> > > will address the Jetson Nano issue, but if you'd like to try them, the
> > > latest userspace changes are available here:
> > >
> > >    https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/3724
> > >
> > > And the tegra-drm kernel patches are here:
> > >
> > >
> > > https://patchwork.ozlabs.org/project/linux-tegra/patch/20191217005205.2573-1-jajones@nvidia.com/
> > >
> > > Those + the kernel changes addressed in this thread are everything I had
> > > outstanding.
> > >
> >
> > I don't know if that's caused by your changes or not, but now the
> > assert I hit is a different one pointing out that
> > nvc0_miptree_select_best_modifier fails in a certain case and returns
> > MOD_INVALID... anyway, it seems like with your patches applied it's
> > now way easier to debug and figure out what's going wrong, so maybe I
> > can figure it out now :)
> >
> 
> collected some information which might help to track it down.
> 
> src/gallium/frontends/dri/dri2.c:648 is the assert hit: assert(*zsbuf)
> 
> templ is {reference = {count = 0}, width0 = 300, height0 = 300, depth0
> = 1, array_size = 1, format = PIPE_FORMAT_Z24X8_UNORM, target =
> PIPE_TEXTURE_2D, last_level = 0, nr_samples = 0, nr_storage_samples =
> 0, usage = 0, bind = 1, flags = 0, next = 0x0, screen = 0x0}
> 
> inside tegra_screen_resource_create modifier says
> DRM_FORMAT_MOD_INVALID as template->bind is 1
> 
> and nvc0_miptree_select_best_modifier returns DRM_FORMAT_MOD_INVALID,
> so the call just returns NULL leading to the assert.
> 
> Btw, this is on Xorg-1.20.8-1.fc32.aarch64 with glxgears.

Hi Karol,

I'm not sure if I'm doing something wrong, but I can't seem to reproduce
these assertions at all. I've got a debug Mesa build from today as well
as an X server build from today and if I run glxgears it works just fine
for me. This is on Jetson TX1, but I don't think there's any difference
to Jetson Nano in that regard. I'll try to give this a try on Jetson
Nano as well, just to make sure. I can also try to pull in James'
patches to see if they change anything for me.

However, perhaps we can compare notes on what exactly your configuration
is so that perhaps I can reproduce and take a closer look at what's
going on.

My Mesa build uses the following configuration:

    $ meson --prefix /usr --libexecdir /usr/lib --buildtype debug -Dgles1=false \
        -Dgallium-drivers=nouveau,swrast,tegra -Dgallium-opencl=standalone \
        -Dvulkan-drivers='' -Dplatforms=wayland,x11,drm,surfaceless \
        -Dbuild-tests=true -Dtexture-float=true -Ddri-drivers='' \
        -Dgallium-omx=disabled -Dllvm=true

And here's what I use for X:

    $ meson --prefix /usr --libexecdir /usr/lib \
        --libexecdir /usr/lib/xorg-server -Dxdmcp=false

I've stripped out some cross-compilation boilerplate there because that
shouldn't be relevant. Do you see anything in there that I'm missing and
which might be causing the issue not to happen for me?

Also, what's the window manager that you use? I use TWM (for simplicity)
and I suspect that's not what you use, so perhaps this is relevant
somehow as well?

Thierry

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