Re: libdrm+kernel patches/fixes from wayland porting work

[Taylor R Campbell <riastradh%NetBSD.org@localhost>]

> Date: Thu, 30 Jan 2025 23:13:45 -0800
> From: Jeff Frasca <thatguy%jeff-frasca.name@localhost>
> 
> I am back on my project of trying to get my wlroots style Wayland
> compositor running on NetBSD.

Cool!

> My experience with NetBSD is that X11 ends up running anything with
> OpenGL via the LLVMpipe software renderer, and I think I figured
> out why.
> 
> The libdrm routines that Mesa uses to initialize itself for both the
> compositor and the client apps leans heavily on the GET_UNIQUE ioctl.
> However, only the master node has a unique string, and the render
> nodes do not.  For both the compositor and the client, Mesa calls
> GET_UNIQUE on the render node's device fd, gets back an error and
> then gives up on setting up full acceleration.

Last year I made some changes to HEAD to address this:

PR kern/58180: render nodes are busted https://gnats.NetBSD.org/58180
https://mail-index.NetBSD.org/source-changes/2024/04/21/msg150921.html
https://mail-index.NetBSD.org/source-changes/2024/04/21/msg150922.html

The approach was to pass the same information through the GET_UNIQUE
ioctl and expose it to render nodes.

However, that exposed some other bug which broke Firefox or something,
so it's not getting pulled up to 10.

Will take a look at the rest later when I have a moment!