[Intel-gfx] [PATCH] Proc to debugfs migration, 2nd attempt

[Ben Gamari]

Hey everyone,
    
Here is my procfs cleanup patchset. As you can see, the first two 
patches attempt to clean up the existing proc file creation code and 
port the files' implementations to the seq_file interface. The remaining
patches focus on implementing a similar system for debugfs files.

Feedback has generally indicated that while removing drm information 
from /proc is a worthwhile goal, we need to provide a transition period
in which we can keep this information available in both debugfs and 
/proc. The refactoring with seq_file made this almost trivial, requiring
only that I move the file implementations to a combined file which both
the proc and debugfs code can link against. I declared these symbols in
a new header file (drm_info.h) and while I haven't seen any precedent 
for this in the drm code, I did want to keep from lengthening drmP.h any
more than it already is, especially given these symbols are only 
referred to in two places. It is my thought that eventually the proc 
file code will be pulled out anyways and we'll be able to merge 
drm_info.[ch] back into drm_debugfs.c. Let me know if anyone has an 
issue with this.

Anyways, I think most of it is pretty straightforward. Please pardon the
less-than-stellar organization of the patchset, I did my best to santize it
but rebasing while moving whole files around seems to be quite tedious. I
think that the patch set is pretty much ready for merge. I've been running it
for several weeks now without incident. Let me know what you think,

    - Ben