Re: [PATCH 1/2] x86/amd_node: Fix AMD root device caching

Borislav Petkov
2025-10-21T14:15:22Z

On Tue, Oct 21, 2025 at 09:37:45AM -0400, Yazen Ghannam wrote:
> It's correct that one of the root devices will be on bus 0x0. But that
> device will be part of AMD node 0. So we still need to pick a root
> device for the other, if any, AMD nodes in the system.
>
> For example, a system with 2 AMD nodes could have this:
> Node 0 : 0x00 0x07 0x0e 0x15
> Node 1 : 0x1c 0x23 0x2a 0x31

Aha, so next question: isn't there a way to figure out which is the *first*
PCI bus of a AMD node? My gut feeling tells me there should be some info
somewhere which we can use...

--
Regards/Gruss,
Boris.