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SubjectRe: [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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