Re: [PATCHv2 2/2] pci: warn if a running device is unaware of reset

[Keith Busch <kbusch@kernel.org>]

On Mon, Nov 04, 2024 at 10:44:23AM +0100, Niklas Schnelle wrote:
> 
> One more question though, what would happen with this reset for a bus
> with an SR-IOV device with more than 256 VFs i.e. where
> pci_iov_virtfn_bus() returns anything other than 0. I'm guessing since
> VFs are physically still controlled by the bridge all VFs would be
> reset but at the same time virtfn_add_bus() sets the bridge device for
> the added bus as NULL so I think it might look odd in sysfs, sadly I
> don't have such a device to test with. Still, this might actually be an
> argument for having the attribute on the bridge.

I assume everything is reset at the PCI level.

Are you asking what the kernel does? I don't think it does anything
special with SR-IOV functions. Those pci_dev's aren't attached to the
bridge pci_dev; you have to go through the pci_bus' children instead.