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

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Message-Id: <1245793758.10356.27.camel@pasglop>
Date:	Wed, 24 Jun 2009 07:49:18 +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 13:34 -0700, Jeremy Fitzhardinge wrote:
> On reflection, I think this will work.  We have a Xen pci passthrough
> driver which gets told about the passed-through devices via xenbus,
> and
> does the appropriate setup.  At first glance, there doesn't seem to be
> any problem with that code just explicitly instantiate the devices at
> the PCI level in the same way pci_scan_device does (ie,
> alloc_pci_device, initalize the dev struct, pci_setup_device).
> 
> Is that what you mean?
> 
> IanC has looked at that code more closely, so perhaps he can confirm
> that this will work on our side.
> 
Yes, we do that in arch/powerpc/kernel/pci_64.c (and somewhere in
arch/sparc too). I'll merge those 2 implementations one of these days
and move them to drivers/of.

I think Willy was actually suggesting that you start using our
OF/device-tree stuff though which is a slightly more invasive deal but
might end up useful for other things in the long run :-)

Cheers,
Ben.


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