linux-kernel - Re: [PATCH] PCI: remove pcibios_scan_all

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Date:	Wed, 24 Jun 2009 10:02:29 +1000
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
Cc:	Matthew Wilcox <matthew@....cx>, Alex Chiang <achiang@...com>,
	jbarnes@...tuousgeek.org, linux-arch@...r.kernel.org,
	Kyle McMartin <kyle@...artin.ca>,
	Tony Luck <tony.luck@...el.com>,
	Russell King <linux@....linux.org.uk>,
	Arnd Bergmann <arnd@...db.de>,
	Yoshinori Sato <ysato@...rs.sourceforge.jp>,
	Jeff Dike <jdike@...toit.com>, linux-kernel@...r.kernel.org,
	Ralf Baechle <ralf@...ux-mips.org>,
	David Howells <dhowells@...hat.com>,
	Paul Mundt <lethal@...ux-sh.org>,
	Ivan Kokshaysky <ink@...assic.park.msu.ru>,
	Ingo Molnar <mingo@...hat.com>,
	"David S. Miller" <davem@...emloft.net>,
	Avi Kivity <avi@...hat.com>,
	Ian Campbell <Ian.Campbell@...citrix.com>
Subject: Re: [PATCH] PCI: remove pcibios_scan_all_fns()

On Tue, 2009-06-23 at 15:53 -0700, Jeremy Fitzhardinge wrote:
> On 06/23/09 15:41, Benjamin Herrenschmidt wrote:
> >> Do you have any other cases in mind where it would be helpful?
> >>     
> >
> > Well, it might be for virtual device discovery etc... but don't bother
> > now. We might talk about it at KS for those interested. It's more
> > something we see as useful for embedded archs at the moment but in the
> > long run it might make sense for hypervisors as well.
> >   
> 
> Perhaps.  We have Xenbus - which is  a little bit like OF in that it has
> data in a hierarchical namespace - and I guess it might be possible to
> find a mapping onto some generic OF-like interface.

Which is sort-of what we did. IE. We disconnected the device-tree itself
from the underlying firmware, using the device-tree and OF-style
bindings (in some case simplified) as a basis for representing devices
but without the need for an actual open firmware underneath.

> However, Xenbus is an active communication channel between virtual machines
> rather than a
> static representation of a machine configuration (for example, you can
> put a watch on a particular path to get a notification of when someone
> else changes it).

On ppc64 too, the HV can feed us with new tree nodes or remove some, it
doesn't have to be static. Though we mostly use it as a static tree on
embedded.

> But, yes, this is a good KS hallway track subject.

Cheers,
Ben.


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