pciaccess clean up

[Ian Romanick]

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Tiago Vignatti wrote:

| Please review the attached. If no one objects I'll push this commits to
| the master branch in some days.

All of those changes look fine to me.  There was a fair amount of dead
or semi-dead code that I left behind just to keep the patches smaller.
The PCI-rework patch was already several thousand lines, and I didn't
want any additional discouragement for people to review it. :)

| Also, ajax said that the only OS expected to work on ia64 is linux, so
| probably we can safely nuke 460gxPCI.[ch], altixPCI.[ch], e8870PCI.[ch],
| zx1PCI.[ch], which currently aren't ported to pciaccess. No problem here?

There was a reason I left those around when I did the original
PCI-rework, but I don't recall what it was.  I believe there many have
been some other interactions with that code that, without access to IA64
hardware, I couldn't verify.

| I'm tracing why Xorg isn't posting correctly the secondary cards and for
| sure there's a lot of code (basically xf86pciBus.c) that will be also
| nuked after this be fixed (btw, is there anyone being able to start a
| secondary card under master branch today?).

I have had various reports of it not working correctly on systems with
two identical G450 PCI cards.  I haven't had time to verify or debug yet.
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