Re: [PATCH v8 1/7] x86/hygon: Add Family 0x18 DF node enumeration

[Lin Wang]

On 10/24/2026 11:15 PM, Yazen Ghannam wrote:
> On Thu, Oct 22, 2026 at 03:42:11PM +0800, Lin Wang wrote:
> > The AMD node code locates function 3 for node N at PCI slot 0x18 + N.
> > Hygon has no equivalent node-index-to-slot mapping: DF F3 devices are
> > discovered by PCI ID and the PCI BDF is only an access point.
> >
> > Enumerate Hygon DF devices by PCI ID and read their identities from DF
> > registers. Build a dense node cache with Core and DDR Dies (CDDs) before
> > I/O Dies (IODs), providing node counts, identity and PCI function lookups.
> >
> > Guests may expose a supported CPU model without DF devices. Suppress
> > the cache-build warning for -ENODEV in guests; keep other initialization
> > errors visible.
> >
> > The node lookup helpers remain local until Hygon consumers are added.
> >
> > Signed-off-by: Lin Wang <wanglin@xxxxxxxxxxxxxx>
> > ---
>
> Reviewed-by: Yazen Ghannam <yazen.ghannam@xxxxxxx>

Thanks for the review.

I'll send v9 to fix the SMN root-array leak reported by Sashiko in
patch 7.

Thanks,

Lin