Device enumeration support in libdrm

[Emil Velikov]

Hello Jammy,

On 8 July 2015 at 06:53, Zhou, Jammy <Jammy.Zhou at amd.com> wrote:
> Hi Emil,
>
>
>
> With our previous RFC patches to add interfaces to support GPU device
> enumeration support in libdrm, the udev mechanism was used. But we found
> that if we introduce the libudev dependency for libdrm, there will be some
> problem to run steam application on recent distributions (for example,
> Ubuntu 14.04 LTS) because of the conflict between the system libudev.so.1
> (loaded by libdrm) and the libudev.so.0 (bundled in steam-runtime and loaded
> by steam application). There are some similar issues as mentioned in the
> links below. Although we can argue that it is application’s problem, can we
> get rid of libudev for the device enumeration before Valve can make
> steam-runtime use system libraries by default? It is much appreciated if you
> can give some suggestions about how we can support device enumeration with
> libdrm.
>
I believe I mentioned it before, perhaps I wasn't clear enough. Rather
than using libudev, manually iterate through sysfs. I agree it's not a
not pretty solution yet the libdrm code already has much weirder
stuff.

Cheers
Emil