On Tue, Jul 17, 2018 at 01:39:00PM -0700, Matthew Wilcox wrote: > I don't like telling the user to grovel around lspci -t by hand. It's > not many lines of code to add a new -P option to lspci to show the path > to each device instead of bus:dev.fn > > Here's three examples, first without, then with -P. > ... > The Nehalem system makes an interesting testcase because it exposes some > registers in fake PCIe devices that aren't behind the root ports. eg: > > ff:06.3 Host bridge: Intel Corporation Xeon 5500/Core i7 Integrated Memory Controller Channel 2 Thermal Control Registers (rev 04) I think these appear as conventional PCI devices; at least the ones I've seen, e.g., [1], don't have a PCIe capability, so I think it makes sense that they're not behind a root port. [1] https://bugzilla5.redhat.com/attachment.cgi?id=433169
