Re: [Bug 212261] New: pci 0000:00:00.2: can't derive routing for PCI INT A

Re: [Bug 212261] New: pci 0000:00:00.2: can't derive routing for PCI INT A

[Bjorn Helgaas]

On Sat, Mar 13, 2021 at 01:19:39PM +0000, bugzilla-daemon@bugzilla.kernel.org wrote:
> https://bugzilla.kernel.org/show_bug.cgi?id=212261
> 
>             Bug ID: 212261
>            Summary: pci 0000:00:00.2: can't derive routing for PCI INT A
>            Product: Drivers
>            Version: 2.5
>     Kernel Version: 5.10.22
>           Hardware: All
>                 OS: Linux
>               Tree: Mainline
>             Status: NEW
>           Severity: normal
>           Priority: P1
>          Component: PCI
>           Assignee: drivers_pci@kernel-bugs.osdl.org
>           Reporter: kernelbugs@equaeghe.nospammail.net
>         Regression: No
> 
> I'm on a Lenovo T14 AMD, with a Ryzen 4750U. In the logs, I find
> 
> pci 0000:00:00.2: AMD-Vi: IOMMU performance counters supported
> pci 0000:00:00.2: can't derive routing for PCI INT A
> pci 0000:00:00.2: PCI INT A: not connected
> 
> where the last two lines are warnings. Various bugreports related to this can
> be found elsewhere.
> 
> I guess there is either something wrong with the hardware/firmware or with the
> kernel. I'd hope this warning can be fixed. Feel free to ask for more
> information.

Thanks for the report!

What device is 00:00.2?  Does it work?  If not, did it ever work,
i.e., is this a regression?  If it's a regression, what's the newest
kernel you know of where it did work?

Can you please attach a complete dmesg log and output of
"sudo lspci -vvv" to the bugzilla?

Can you also add links to any related bug reports you're aware of?

Bjorn