Re: multi-domain PCI and sysfs

Jesse Barnes
2004-09-08T16:06:22Z

On Tuesday, September 7, 2004 11:01 pm, Jon Smirl wrote:
> X on GL is going to eliminate all device access from X. Everything
> will be handled from the OpenGL layer. When everything is finished
> even the OpenGL layer won't do hardware access either, it will IOCTL
> the DRM driver to do it. In the final solution the only user of the
> VGA control should be the secondary card reset program.

Oh right, I forgot. Anyway, the card reset program needs to get at this stuff
somehow.

> Where is the PCI segment base address stored in the PCI driver
> structures? I'm still having trouble with the fact that the PCI driver
> does not have a clear structure representing a PCI segment. Shouldn't
> there be a structure corresponding to a segment?

That would be nice, maybe an extra resource or something? I haven't looked at
the sparc code, but it probably deals with this (sn2 has platform specific
functions to get the base address for a bus).

> From what I understand right now the SN2 machine can not have two
> active VGA cards since it does not have two PCI segments. Without two
> segments there is no way to tell the legacy addresses apart.

sn2 does have multiple PCI segments, we just don't export them yet.

Jesse