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SubjectRe: [patch 2.5] 2-pass PCI probing, generic part
On Sat, 11 Jan 2003, Ivan Kokshaysky wrote:

> On Fri, Jan 10, 2003 at 11:00:30AM -0800, Grant Grundler wrote:
> > Or dynamically assigns windows to PCI Bus controllers as PCI devices
> > are brought on-line.
>
> Eh? In general case, to make room for newly added device, you have
> to shutdown the whole PCI bus starting from level 0, reassign _all_
> BARs and bridge windows and then restart...
> The "hotplug resource reservation" is the only viable approach, it has
> been discussed numerous times.
>
> > For PCI Hotplug, the role of managing MMIO/IRQ
> > resources has moved to the OS since these services are needed
> > after the OS has taken control of the box.
>
> 100% agree. :-)

Since the lack of resource reservation currently is keeping CompactPCI
hot insertion from working properly, I have a strong interest in getting
something in place before 2.6. I've got a completely manual (kernel
command-line parameter controlled) reservation patch[1] against 2.4 that
I could start updating, but I've always thought there must be a more
elegant way to do things than the somewhat crude fixup approach I used
in it. I'm willing to try coding up something if you or anyone else
have some ideas as to what would be an acceptable solution.

Thanks,

Scott

[1] look at the new file drivers/pci/setup-hp.c contained in:
ftp://oss.somanetworks.com/pub/linux/cpci/v2.4/linux-2.4.19-cpci-20021107.diff.gz


--
Scott Murray
SOMA Networks, Inc.
Toronto, Ontario
e-mail: scottm@somanetworks.com


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