linux-kernel - RE: [PATCH 3/4 v2] PCI: support SR-IOV capability

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Message-ID: <7A25B56E4BE99C4283EB931CD1A40E110181CABC@pdsmsx414.ccr.corp.intel.com>
Date:	Wed, 10 Sep 2008 15:36:48 +0800
From:	"Zhao, Yu" <yu.zhao@...el.com>
To:	"Alex Chiang" <achiang@...com>
Cc:	"Jesse Barnes" <jbarnes@...tuousgeek.org>,
	<linux-pci@...r.kernel.org>,
	"Randy Dunlap" <randy.dunlap@...cle.com>,
	"Greg KH" <greg@...ah.com>,
	"Grant Grundler" <grundler@...isc-linux.org>,
	"Matthew Wilcox" <matthew@....cx>, <linux-kernel@...r.kernel.org>,
	<kvm@...r.kernel.org>, <virtualization@...ts.linux-foundation.org>,
	<xen-devel@...ts.xensource.com>
Subject: RE: [PATCH 3/4 v2] PCI: support SR-IOV capability

On Monday, September 01, 2008 11:30 PM, Alex Chiang wrote:
>To: Zhao, Yu
>Cc: Jesse Barnes; linux-pci@...r.kernel.org; Randy Dunlap; Greg KH; Grant
>Grundler; Matthew Wilcox; linux-kernel@...r.kernel.org; kvm@...r.kernel.org;
>virtualization@...ts.linux-foundation.org; xen-devel@...ts.xensource.com
>Subject: Re: [PATCH 3/4 v2] PCI: support SR-IOV capability
>
>* Zhao, Yu <yu.zhao@...el.com>:
>> Support SR-IOV capability. By default, this feature is not enabled and the
>SR-IOV device behaves as traditional PCI device. After it's enabled, each
>Virtual Function's PCI configuration space can be accessed using its own Bus,
>Device and Function Number (Routing ID). Each Virtual Function also has PCI
>Memory Space, which is used to map its own register set.
>>
>> Signed-off-by: Yu Zhao <yu.zhao@...el.com>
>> Signed-off-by: Eddie Dong <eddie.dong@...el.com>
>>
>> ---
>>  drivers/pci/Kconfig      |   10 +
>>  drivers/pci/Makefile     |    2 +
>>  drivers/pci/iov.c        |  555
>++++++++++++++++++++++++++++++++++++++++++++++
>>  drivers/pci/pci.c        |   14 +-
>>  drivers/pci/pci.h        |   44 ++++
>>  drivers/pci/probe.c      |    5 +
>>  include/linux/pci.h      |   28 +++
>>  include/linux/pci_regs.h |   20 ++
>>  8 files changed, 677 insertions(+), 1 deletions(-)
>>  create mode 100644 drivers/pci/iov.c
>>
>> diff --git a/drivers/pci/Kconfig b/drivers/pci/Kconfig
>> index f43cc46..0a1fe01 100644
>> --- a/drivers/pci/Kconfig
>> +++ b/drivers/pci/Kconfig
>> @@ -57,3 +57,13 @@ config PCI_ARI
>>  	default n
>>  	help
>>  	  This enables PCI Alternative Routing-ID Interpretation.
>> +
>> +config PCI_IOV
>> +	bool "PCI SR-IOV support"
>> +	depends on PCI && HOTPLUG
>> +	select PCI_MSI
>> +	select PCI_ARI
>> +	select HOTPLUG_PCI
>> +	default n
>> +	help
>> +	  This allows device drivers to enable Single Root I/O Virtualization.
>
>I'd like to see this Kconfig help text enhanced too. Telling a
>user that PCI_IOV enables Single Root I/O Virtualization isn't
>that helpful, but explaining what SR-IOV actually gets you _is_
>helpful.
>
>	This option allows device drivers to enable Single Root I/O
>	Virtualization.  Each Virtual Function's PCI configuration
>	space can be accessed using its own Bus, Device and Function
>	Number (Routing ID). Each Virtual Function also has PCI Memory
>	Space, which is used to map its own register set.

Will do this too in next version.

>
>Thanks.
>
>/ac

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