radeon: Make PM info available to all, not just debug users, yearly re-roll

[Lauri Kasanen]

Hi list,

In June 2012 I started a discussion on moving the radeon PM info out
from debugfs, into a proper place available to all, be it proc, sysfs,
or some other way. For the rationale please see the archives:
http://www.mail-archive.com/dri-devel@lists.freedesktop.org/msg23401.html

Jerome's reply at the time was that since big changes are coming, he
didn't want to commit to any ABI at that time. DPM has now landed.

Jerome wanted to implement a custom ioctl for unprivileged apps to
query the power details (and ideally other GPU info too). As now the
big changes have happened, what's the status on this ioctl?


Pre-emptive -enopatch: I'm not the right person to design an ioctl, with
exactly zero such experience in making kernel ABIs. I do volunteer to
making the userspace app that displays the values and info.

- Lauri