linux-kernel - Re: [PATCH 15/16 v6] PCI: document the SR-IOV sysfs entries

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Date:	Fri, 07 Nov 2008 11:01:29 +0800
From:	"Zhao, Yu" <yu.zhao@...el.com>
To:	Greg KH <greg@...ah.com>
CC:	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	"achiang@...com" <achiang@...com>,
	"grundler@...isc-linux.org" <grundler@...isc-linux.org>,
	"mingo@...e.hu" <mingo@...e.hu>,
	"jbarnes@...tuousgeek.org" <jbarnes@...tuousgeek.org>,
	"matthew@....cx" <matthew@....cx>,
	"randy.dunlap@...cle.com" <randy.dunlap@...cle.com>,
	"rdreier@...co.com" <rdreier@...co.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"kvm@...r.kernel.org" <kvm@...r.kernel.org>,
	"virtualization@...ts.linux-foundation.org" 
	<virtualization@...ts.linux-foundation.org>
Subject: Re: [PATCH 15/16 v6] PCI: document the SR-IOV sysfs entries

Greg KH wrote:
> On Wed, Nov 05, 2008 at 08:33:18PM -0800, Greg KH wrote:
>> On Wed, Oct 22, 2008 at 04:45:15PM +0800, Yu Zhao wrote:
>>>  Documentation/ABI/testing/sysfs-bus-pci |   33 +++++++++++++++++++++++++++++++
>>>  1 files changed, 33 insertions(+), 0 deletions(-)
>>>
>>> diff --git a/Documentation/ABI/testing/sysfs-bus-pci b/Documentation/ABI/testing/sysfs-bus-pci
>>> index ceddcff..41cce8f 100644
>>> --- a/Documentation/ABI/testing/sysfs-bus-pci
>>> +++ b/Documentation/ABI/testing/sysfs-bus-pci
>>> @@ -9,3 +9,36 @@ Description:
>>>  		that some devices may have malformatted data.  If the
>>>  		underlying VPD has a writable section then the
>>>  		corresponding section of this file will be writable.
>>> +
>>> +What:		/sys/bus/pci/devices/.../iov/enable
>> Are you sure this is still the correct location with your change to
>> struct device?
> 
> Nevermind, this is correct.
> 
> But the bigger problem is that userspace doesn't know when these
> attributes show up.  So tools like udev and HAL and others can't look
> for them as they never get notified, and they don't even know if they
> should be looking for them or not.
> 
> Is there any way to tie these attributes to the "main" pci device so
> that they get created before the device is announced to the world?
> Doing that would solve this issue.
> 
> thanks,
> 
> greg k-h

Currently PCI subsystem has /sys/.../{vendor,device,...} bundled to the 
main PCI device (I suppose this means the entries are created by 
'device_add')

And after the PCI device is announced, 
/sys/.../{config,resourceX,rom,vpd,iov,...} get created depending on if 
these features are supported.

Making dynamic entries tie to the main PCI device would require PCI 
subsystem to allocate different 'bus_type' for the devices, right?

Regards,
Yu
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