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

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Date:	Mon, 22 Jun 2009 11:20:24 -0700
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Matthew Wilcox <matthew@....cx>
CC:	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>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	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>
Subject: Re: [PATCH] PCI: remove pcibios_scan_all_fns()

On 06/22/09 07:34, Matthew Wilcox wrote:
> On Mon, Jun 22, 2009 at 08:08:07AM -0600, Alex Chiang wrote:
>   
>> This was #define'd as 0 on all platforms, so let's get rid of it.
>>
>> This change makes pci_scan_slot() slightly easier to read.
>>     
>
>   
>> diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
>> index f1ae247..b613cad 100644
>> --- a/drivers/pci/probe.c
>> +++ b/drivers/pci/probe.c
>> @@ -1056,8 +1056,7 @@ int pci_scan_slot(struct pci_bus *bus, int devfn)
>>  	if (dev && !dev->is_added)	/* new device? */
>>  		nr++;
>>  
>> -	if ((dev && dev->multifunction) ||
>> -	    (!dev && pcibios_scan_all_fns(bus, devfn))) {
>> +	if (dev && dev->multifunction) {
>>  		for (fn = 1; fn < 8; fn++) {
>>  			dev = pci_scan_single_device(bus, devfn + fn);
>>  			if (dev) {
>>     
>
> What a good idea.  I was just looking at making this more complicated
> (due to the ARI capability).
>
> I'd like to know what the KVM / Xen / ... people think about this.
> I don't know if they rely on function 5 being able to show up out of
> the blue.
>   

We want to be able to export specific functions to a particular domain,
so it might see a PCI device with only function 5.

It looks like we lose that ability with this patch, is that right?

    J
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