[Mesa-dev] [PATCH] Don't use libudev for glx/dri3

Keith Packard keithp at keithp.com
Mon Nov 18 22:46:55 PST 2013

Emil Velikov <emil.l.velikov at gmail.com> writes:

> On 18/11/13 01:08, Keith Packard wrote:
>> libudev doesn't have a stable API/ABI, and if the application wants to use one
>> version, we'd best not load another into libGL.
>> Signed-off-by: Keith Packard <keithp at keithp.com>
>> ---
> Hi Keith,
> Did you had the chance to look at src/gallium/targets/egl-static/egl.c?
> It has a different implementation of drm_fd_get_pci_id, whenever udev is
> not available.

Yeah, it's ugly in a different way from the udev technique...

> AFAICS it goes back to the kernel via the relevant ioctl to retrieve the
> deviceid/chipid. Currently all but nouveau provide such information. I'm
> thinking that this approach might be more reasonable for those concerned
> with portability of the udev bits (think on *BSD).

I'd encourage some kind of standard IOCTL from DRM that returns the
PCI-ID of the underlying device, rather than relying on the level of
kludge present in either the udev (or my fake udev) method or the
non-udev path in the egl code...

> I'm not nitpicking, just thought you might find this interesting.

Definitely interesting; it's almost what we want -- the kernel knows the
information, there just isn't a clean way of getting it (and no way at
all for some devices).

keith.packard at intel.com
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