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

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Date:	Wed, 10 Sep 2008 15:59:35 +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 Tuesday, September 02, 2008 12:41 AM, Alex Chiang wrote:
>* 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
>>
>
>So, what happens if another hotplug driver is already loaded?
>
>I don't know the SR-IOV spec well enough to know if you are
>allowed to have SR-IOV + some other form of hotplug, like ACPI or
>native PCIe.
>
>Today, pci_hp_register will return -EBUSY.
>
>If SR-IOV really doesn't have anything to do with hotplug, then
>it may be a candidate for directly calling pci_create_slot(). In
>that case, 'param' should not be a property of a hotplug slot,
>but of a generic PCI slot.

That's correct, SR-IOV really doesn't have anything to do with hotplug. I was just reusing hotplug sysfs as the control interface. Will remove this in next work, and create SR-IOV own sysfs entries under /sys/bus/pci/devices/.../iov/...

Thanks.

>
>Thanks.
>
>/ac

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