Re: [PATCH 16/16 v6] PCI: document the new PCI boot parameters

[Greg KH]

On Fri, Nov 07, 2008 at 04:35:47PM +0800, Zhao, Yu wrote:
> Greg KH wrote:
>> On Fri, Nov 07, 2008 at 04:17:02PM +0800, Zhao, Yu wrote:
>>>> Well, to do it "correctly" you are going to have to tell the driver to
>>>> shut itself down, and reinitialize itself.
>>>> Turns out, that doesn't really work for disk and network devices without
>>>> dropping the connection (well, network devices should be fine probably).
>>>> So you just can't do this, sorry.  That's why the BIOS handles all of
>>>> these issues in a PCI hotplug system.
>>>> How does the hardware people think we are going to handle this in the
>>>> OS?  It's not something that any operating system can do, is it part of
>>>> the IOV PCI spec somewhere?
>>> No, it's not part of the PCI IOV spec.
>>>
>>> I just want the IOV (and whole PCI subsystem) have more flexibility on 
>>> various BIOSes. So can we reconsider about resource rebalance as boot 
>>> option, or should we forget about this idea?
>> As you have proposed it, the boot option will not work at all, so I
>> think we need to forget about it.  Especially if it is not really
>> needed.
>
> I guess at least one thing would work if people don't want to boot twice: 
> give the bus number 0 as rebalance starting point, then all system 
> resources would be reshuffled :-)

Hm, but don't we do that today with our basic resource reservation logic
at boot time?  What would be different about this kind of proposal?

thanks,

greg k-h
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