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

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Date:	Tue, 23 Jun 2009 14:56:53 -0600
From:	Matthew Wilcox <matthew@....cx>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
Cc:	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	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, Jun 23, 2009 at 01:34:46PM -0700, Jeremy Fitzhardinge wrote:
> On 06/23/09 12:08, Matthew Wilcox wrote:
> > I think simply materialising them, either the way the OF code does,
> > or the way the IOV code does is the best route forwards.
> >   
> 
> 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).

Even easier actually, pci_scan_single_device() should do everything you want.

> 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.
> 
>     J
> --
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-- 
Matthew Wilcox				Intel Open Source Technology Centre
"Bill, look, we understand that you're interested in selling us this
operating system, but compare it to ours.  We can't possibly take such
a retrograde step."
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