linux-kernel - [PATCH v2 2/2] gpu: nova-core: declare that VFs are not (yet) supported

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Message-ID: <20251002020010.315944-3-jhubbard@nvidia.com>
Date: Wed,  1 Oct 2025 19:00:10 -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 2/2] gpu: nova-core: declare that VFs are not (yet) supported

nova-core does not yet support PCIe Virtual Functions (VFs). Until it
does, declare to the Rust PCI driver core that VFs are not supported.

Because the Rust PCI driver core defaults to Driver::SUPPORTS_VF =
false, this change is not strictly necessary for functionality. Its
purpose is to provide a self-documentating line of code that can be
easily changed, when VF support is being added.

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>
Suggested-by: Danilo Krummrich <dakr@...nel.org>
Signed-off-by: John Hubbard <jhubbard@...dia.com>
---
 drivers/gpu/nova-core/driver.rs | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/gpu/nova-core/driver.rs b/drivers/gpu/nova-core/driver.rs
index 5d23a91f51dd..4c19b0067862 100644
--- a/drivers/gpu/nova-core/driver.rs
+++ b/drivers/gpu/nova-core/driver.rs
@@ -51,6 +51,11 @@ impl pci::Driver for NovaCore {
     type IdInfo = ();
     const ID_TABLE: pci::IdTable<Self::IdInfo> = &PCI_TABLE;
 
+    // PCI probe() will report the same device ID for a PF and its associated VFs. This will cause
+    // failures when trying to bind to the VFs, until NovaCore adds support to handle that
+    // situation. Until then, tell the PCI driver core that we don't support VFs.
+    const SUPPORTS_VF: bool = false;
+
     fn probe(pdev: &pci::Device<Core>, _info: &Self::IdInfo) -> Result<Pin<KBox<Self>>> {
         dev_dbg!(pdev.as_ref(), "Probe Nova Core GPU driver.\n");
 
-- 
2.51.0