[request] Generic KMS driver (a la SimpleDRM)

[jbeich]

Required for Wayland for unsupported GPUs with software rendering. Xorg has xf86-video-vesa, xf86-video-scfb, etc. but Wayland standardized on KMS. To overcome this Linux added simpledrm driver to bridge various framebuffer drivers.

See also (fbdev uAPI is similar to syscons/vt):
torvalds/linux@11e8f5fd223b
swaywm/wlroots#2410
https://gitlab.freedesktop.org/wayland/weston/-/merge_requests/812
https://invent.kde.org/plasma/kwin/-/merge_requests/1906

[hny-gd]

That would be very, very useful as currently there is no way to use Wayland e.g. in VMs.

[arrowd]

I thought such thing already exists and is called either swrast or llvmpipe?

[evadot]

I thought such thing already exists and is called either swrast or llvmpipe?

Not the same thing, swrast is a software renderer.
SimpleDRM creates a drm device (/dev/dri/card0) but no drm render device.
So you still have software accel (and so need swrast/llvmpipe) but can talk with KMS to the driver meaning wayland software will work.