Felix Kühling wrote:
Whats the point of doing these operations in DRM anyway?
Personally I would just pull out as much code from there as possible.
I was wondering about that too. There may be some reason for doing
those things in the kernel, but I don't know of any.
At least on some hardware buffer clearing and swapping is done by the 2D
engine. Instead of exposing the necessary functionality through some
generic blit or fill ioctls, specific clear and swap operations were
implemented. The fact that the Xserver provides the offsets and pitches
adds some sense of security by preventing untrusted clients from
overwriting random memory.
I believe it should be possible to replace clear and swap ioctls with
generic blit and fill ioctls that do some range checking on their
arguments.
You can't do that for "special" clears like the hyperz fast z clear on
radeons. It could probably still be moved to userspace though, but I'm
not too sure it makes a lot of sense.
Roland
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