linux-kernel - Re: [PATCH v10 6/7] PCI: document SR-IOV sysfs entries

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Date:	Fri, 06 Mar 2009 14:35:24 -0800
From:	Randy Dunlap <rdunlap@...otime.net>
To:	Matthew Wilcox <matthew@....cx>
CC:	Yu Zhao <yu.zhao@...el.com>, jbarnes@...tuousgeek.org,
	linux-pci@...r.kernel.org, kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v10 6/7] PCI: document SR-IOV sysfs entries

Matthew Wilcox wrote:
> Randy, can you wordsmith this one?

I'll try.

> I think I'm starting to understand the difference between physfn and
> dep_link, but an example would definitely help.  It may or may not be
> appropriate to put it in.
> 
> On Fri, Feb 20, 2009 at 02:54:47PM +0800, Yu Zhao wrote:
>> Signed-off-by: Yu Zhao <yu.zhao@...el.com>
>> ---
>>  Documentation/ABI/testing/sysfs-bus-pci |   27 +++++++++++++++++++++++++++
>>  1 files changed, 27 insertions(+), 0 deletions(-)
>>
>> diff --git a/Documentation/ABI/testing/sysfs-bus-pci b/Documentation/ABI/testing/sysfs-bus-pci
>> index ceddcff..84dc100 100644
>> --- a/Documentation/ABI/testing/sysfs-bus-pci
>> +++ b/Documentation/ABI/testing/sysfs-bus-pci
>> @@ -9,3 +9,30 @@ 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/.../virtfn/N
>> +Date:		February 2009
>> +Contact:	Yu Zhao <yu.zhao@...el.com>
>> +Description:
>> +		This symbol link appears when hardware supports SR-IOV

		     symbolic                          supports the SR-IOV

>> +		capability and Physical Function driver has enabled it.

		               ^the | its | a

>> +		The symbol link points to the PCI device sysfs entry of

		    symbolic 

>> +		Virtual Function whose index is N (0...MaxVFs-1).

		the Virtual Function

>> +
>> +What:		/sys/bus/pci/devices/.../virtfn/dep_link
>> +Date:		February 2009
>> +Contact:	Yu Zhao <yu.zhao@...el.com>
>> +Description:
>> +		This symbol link appears when hardware supports SR-IOV

		     symbolic                          supports the SR-IOV

>> +		capability and Physical Function driver has enabled it,

		               ^its | the | a

>> +		and this device has vendor specific dependencies with
>> +		others. The symbol link points to the PCI device sysfs

		            symbolic

>> +		entry of Physical Function this device depends on.
>> +
>> +What:		/sys/bus/pci/devices/.../physfn
>> +Date:		February 2009
>> +Contact:	Yu Zhao <yu.zhao@...el.com>
>> +Description:
>> +		This symbol link appears when a device is Virtual Function.

		     symbolic                          is a Virtual Function.

>> +		The symbol link points to the PCI device sysfs entry of

		    symbolic                                   entry of the

>> +		Physical Function this device associates with.

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