[PATCH v5 3/4] gpu: nova-core: avoid probing non-display/compute PCI functions

[Danilo Krummrich]

On Thu Aug 21, 2025 at 6:42 AM CEST, John Hubbard wrote:
> NovaCore has so far been too imprecise about figuring out if .probe()
> has found a supported PCI PF (Physical Function). By that I mean:
> .probe() sets up BAR0 (which involves a lot of very careful devres and
> Device<Bound> details behind the scenes). And then if it is dealing with
> a non-supported device such as the .1 audio PF on many GPUs, it fails
> out due to an unexpected BAR0 size. We have been fortunate that the BAR0
> sizes are different.
>
> Really, we should be filtering on PCI class ID instead. These days I
> think we can confidently pick out Nova's supported PF's via PCI class
> ID. And if not, then we'll revisit.
>
> The approach here is to filter on "Display VGA" or "Display 3D", which
> is how PCI class IDs express "this is a modern GPU's PF".
>
> Cc: Danilo Krummrich <dakr at kernel.org>
> Cc: Alexandre Courbot <acourbot at nvidia.com>
> Cc: Elle Rhumsaa <elle at weathered-steel.dev>
> Signed-off-by: John Hubbard <jhubbard at nvidia.com>
> ---
>  drivers/gpu/nova-core/driver.rs | 33 ++++++++++++++++++++++++++++-----
>  rust/kernel/pci.rs              | 21 +++++++++++++++++++++

Can you please split this one up in two patches?

>  2 files changed, 49 insertions(+), 5 deletions(-)