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

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Message-ID: <20081107031837.GB30003@kroah.com>
Date:	Thu, 6 Nov 2008 19:18:37 -0800
From:	Greg KH <greg@...ah.com>
To:	"Zhao, Yu" <yu.zhao@...el.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

On Fri, Nov 07, 2008 at 11:01:29AM +0800, Zhao, Yu wrote:
> 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.

And that's a bug.  Let's not continue to make the same bug here as well.

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

No, it would just mean they need to be all added before the device is
fully registered with the driver core.

thanks,

greg k-h
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