Re: PCI ROM resource allocation issue with 2.6.17-rc2

["Jon Smirl" <jonsmirl@gmail.com>]

On 4/25/06, Dave Airlie <airlied@linux.ie> wrote:
>
> >
> > Maybe just add a DRM command to do it, so that old X versions (who don't
> > know about it) will just do it by hand, and then new X versions can do
> >
> >       if (drm_ioctl(fd, DRM_SETUP_THE_DAMN_RESOURCES) < 0) {
> >               /*
> >                * I don't know what errno the drm-ioctl actually
> >                * returns for unrecognized commands, so this is
> >                * just an example
> >                */
> >               if (errno == ENOTTY) {
> >                       old kernel: do it by hand
> >               }
> >       }
> >
> > which allows us to go forward in a sane way, and finally leave the broken
> > X PCI-configuration-by-hand crap behind.
>
> It doesn't help of course, the fb drivers also pci_enable the devices,
> really X needs a kicking square, I'm trying to figure out some sort of fix
> here, but X does't some really stupid things with PCI resources...
>
> We really need a userspace way to pci_enable_device that X can call (via
> sysfs) so for cards that don't have a DRM or fb loaded we still get
> something..

You could make a null DRM driver that is loaded for every card that
doesn't have a real one. Give it aliases to make it match the X driver
names.

The right answer here is to start working towards a solution where the
OS is actually in control of hardware resources instead of a user app.
There can only be one entity in charge of PCI space or we will all go
insane. If we continue to say that old X binaries have to work we will
still have these same problems in 2060.


>
> Dave.
>
> --
> David Airlie, Software Engineer
> http://www.skynet.ie/~airlied / airlied at skynet.ie
> Linux kernel - DRI, VAX / pam_smb / ILUG
>
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--
Jon Smirl
jonsmirl@gmail.com
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