Running out of generic DRM ioctls

[<th...@tu...>]

With the upcoming ttm merge we will basically be running out of generic 
DRM ioctl numbers.
We'll be up to at 0x3e and at 0x40 the device-specific commands start.

Comments in the code allow device-specific commands the range 0x40 to 0x79,
which means we can restart generic ioctls at 0x80 unless there is a 
problem with a supported operating system. Linux seems to allow 8 bits 
for ioctl numbers. What about *BSD?

Should we reserve a larger range for device-specific commands?

/Thomas