Re: lspci: Display path to device
From: Bjorn Helgaas
Date: Tue Jul 17 2018 - 17:00:57 EST
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