On Wed, Jul 14, 2021 at 11:54:27AM -0500, Bjorn Helgaas wrote: > On Wed, Jul 14, 2021 at 02:33:37PM +0800, Wenchao Hao wrote: > > > If they are not fixed, then is there anyway I can get a fixed ID > > which can indicate physical connection. > > You can look at the "lspci -P" option. I'm not really familiar with > this, but I think Matthew (cc'd) implemented it. That option shows the parent devices for each listed device, but that may not produce the same output if BDf doesn't always enumerate the same. I think Wenchao was seeking some invariant device identification that can be used to look up its BDf. There's no PCI level requirement for uniquely identifying a specific device across changing topologies, so I don't think this is generically possible.
