[PATCH 0/3] agp/amd64: Remove support for probing unlisted PCI devices

[Andi Kleen]

On Mon, Jul 07, 2025 at 07:37:07PM +0200, Hans de Goede wrote:
> Hi all,
> 
> As discussed in this thread:
> 
> https://lore.kernel.org/dri-devel/b29e7fbfc6d146f947603d0ebaef44cbd2f0d754.1751468802.git.lukas@wunner.de/
> 
> The amd64_agp driver's support for trying to probe unsupported devices does
> not make sense anymore given that no new AGP devices have been produced for
> a while now.

It's not about AGP devices. By the time the K8 existed it was already
PCI only.

The K8 CPU integrated northbridge uses PCI AGP enumeration to expose its
integrated IOMMU, but it's not real AGP, just uses a mechanism similar
to the AGP aperture.

But you still have to probe the chipset hostbridge, and for these CPUs there
were multiple third party chipsets with different PCI IDs, so it needed
an own ID for each of them.

The reason why it's not needed is that there are no new third party K8
chipsets anymore.


-Andi