linux-kernel - [PATCH v2 0/2] rust: pci: don't probe() VFs in nova-core

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Message-ID: <20251002020010.315944-1-jhubbard@nvidia.com>
Date: Wed,  1 Oct 2025 19:00:08 -0700
From: John Hubbard <jhubbard@...dia.com>
To: Danilo Krummrich <dakr@...nel.org>
Cc: Alexandre Courbot <acourbot@...dia.com>,
	Joel Fernandes <joelagnelf@...dia.com>,
	Timur Tabi <ttabi@...dia.com>,
	Alistair Popple <apopple@...dia.com>,
	Zhi Wang <zhiw@...dia.com>,
	Surath Mitra <smitra@...dia.com>,
	David Airlie <airlied@...il.com>,
	Simona Vetter <simona@...ll.ch>,
	Alex Williamson <alex.williamson@...hat.com>,
	Jason Gunthorpe <jgg@...dia.com>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Krzysztof Wilczyński <kwilczynski@...nel.org>,
	Miguel Ojeda <ojeda@...nel.org>,
	Alex Gaynor <alex.gaynor@...il.com>,
	Boqun Feng <boqun.feng@...il.com>,
	Gary Guo <gary@...yguo.net>,
	Björn Roy Baron <bjorn3_gh@...tonmail.com>,
	Benno Lossin <lossin@...nel.org>,
	Andreas Hindborg <a.hindborg@...nel.org>,
	Alice Ryhl <aliceryhl@...gle.com>,
	Trevor Gross <tmgross@...ch.edu>,
	nouveau@...ts.freedesktop.org,
	linux-pci@...r.kernel.org,
	rust-for-linux@...r.kernel.org,
	LKML <linux-kernel@...r.kernel.org>,
	John Hubbard <jhubbard@...dia.com>
Subject: [PATCH v2 0/2] rust: pci: don't probe() VFs in nova-core

Changes in v2:

1) Completely rewrote the series, using Danilo's suggested approach of
"driver supports VF probing or not": the PCI driver core will skip
probing any device's VFs if the driver has coded itself as "not
supporting VFs".

2) Included Joel's clarification, as a comment in the code, about what
happens if VFs are probed.

As with v1 [1], I've based this on top of today's driver-core-next [2],
because the first patch belongs there, and the second patch applies
cleanly to either driver-core-next or drm-rust-next. So this seems like
the easiest to work with.

[1]] https://lore.kernel.org/20250930220759.288528-1-jhubbard@nvidia.com
[2] https://git.kernel.org/pub/scm/linux/kernel/git/driver-core/driver-core.git/

Cc: Alexandre Courbot <acourbot@...dia.com>
Cc: Alistair Popple <apopple@...dia.com>
Cc: Joel Fernandes <joelagnelf@...dia.com>
Cc: Zhi Wang <zhiw@...dia.com>
Cc: Alex Williamson <alex.williamson@...hat.com>
Cc: Jason Gunthorpe <jgg@...dia.com>
Cc: Danilo Krummrich <dakr@...nel.org>

John Hubbard (2):
  rust: pci: skip probing VFs if driver doesn't support VFs
  gpu: nova-core: declare that VFs are not (yet) supported

 drivers/gpu/nova-core/driver.rs | 5 +++++
 drivers/pci/pci-driver.c        | 3 +++
 include/linux/pci.h             | 1 +
 rust/kernel/pci.rs              | 4 ++++
 4 files changed, 13 insertions(+)


base-commit: 6d97171ac6585de698df019b0bfea3f123fd8385
-- 
2.51.0