[i.MX][Etnaviv] drm platform: drmModeAddFB2WithModifiers returns ENOENT

[any1]

I'm experimenting with the experimental drm platform. It seems that the framebuffer object passed to on_export_dmabuf_resource() cannot be found.

What's the current state of this platform? Is it expected to work in some limited capacity on some system or is it entirely work in progress?

[zdobersek]

Can you describe your hardware and software stack?

So far this was working on Intel integrated GPUs. Pull #145 adds support for wl_resource imports and the drmModeAddFB2 fallback, which got it to work on a RockPi using the open-source stack (i.e. Mesa with Panfrost).

[any1]

I have i.MX6Q running etnaviv (mesa 19.0) on kernel 4.19. I will test the PR and see if it works.

[zdobersek]

I tested it on my side, and it still doesn't seem to work:

08:25:50.272168 ioctl(10, DRM_IOCTL_MODE_ADDFB2, 0xbeeca458) = -1 ENOENT (No such file or directory)
08:25:50.272537 ioctl(10, DRM_IOCTL_MODE_ADDFB2, 0xbeeca430) = -1 ENOENT (No such file or directory)

[woutervanh]

I'm having this issue too. Linux 5.4 & mesa 20.0.7
I can investigate, but will need some directions/input

I traced it down to:
DRM_DEBUG_KMS("Failed to lookup GEM object\n");
in drivers/gpu/drm/drm_gem_framebuffer_helper.c

[ventosus]

Same issue on IMX6DL

# cog --version
0.10.0 (WPE WebKit 2.32.1)

# uname -a
Linux gtv 5.4.77 #1 SMP Tue Jun 22 12:41:11 CEST 2021 armv7l GNU/Linux

# glmark2-es2-wayland 
=======================================================
glmark2 2020.04
=======================================================
OpenGL Information
GL_VENDOR:     etnaviv
GL_RENDERER:   Vivante GC880 rev 5106
GL_VERSION:    OpenGL ES 2.0 Mesa 20.3.5

[clopez]

Can you try with this patch for Mesa/Etnaviv ?

There is here a report of someone that could make cog start with that (with i.MX and Etnaviv), but the screen is still not showing properly the webview.

[woutervanh]

Issue seems still apparent with mesa 23.2.1 / linux 6.1.38
Tried above suggestions/patches but no progress