[PATCH v3 0/5] Rework PCI IRQ vector code

[Danilo Krummrich <dakr@kernel.org>]

This series reworks the Rust PCI interrupt vector abstractions, motivated by
review feedback on the nova-core interrupt support series [1].

Convert IrqVectorRegistration to a lifetime-managed owning type, replacing the
devres-based approach. Since index() borrows the registration, the returned
IrqVector inherits that lifetime, preventing the allocation from being dropped
while any handler is live.

IrqVector embeds a resolved IrqRequest, making the conversion infallible. The
request_irq()/request_threaded_irq() wrappers on Device are removed since their
&self receiver could refer to an unrelated device.

Add pci_irq_type() as a C function in include/linux/pci.h, replacing open-coded
checks across drivers [2], and wrap it for Rust.

[1] https://lore.kernel.org/all/20260808031120.363869-1-jhubbard@nvidia.com/
[2] https://elixir.bootlin.com/linux/v7.1/source/drivers/net/ethernet/aquantia/atlantic/aq_pci_func.c#L196

Changes in v3:
  - Rename s/count/len/, s/vector()/index()/, s/vector_count()/len()/.
  - Remove redundant range check in index().
  - Add missing #[inline].

Changes in v2:
  - Drop the IrqRequestAnchor approach and keep IrqVector as a new type over
    IrqRequest.

Danilo Krummrich (5):
  rust: pci: convert IrqVectorRegistration to a lifetime-managed owning
    type
  rust: pci: resolve IRQ in index() and embed IrqRequest in IrqVector
  rust: pci: remove request_irq() and request_threaded_irq() from Device
  PCI: Add pci_irq_type() to query the allocated interrupt type
  rust: pci: expose the allocated interrupt type

 include/linux/pci.h    |  25 +++++
 rust/helpers/pci.c     |   5 +
 rust/kernel/pci.rs     |   3 +-
 rust/kernel/pci/irq.rs | 220 ++++++++++++++++++-----------------------
 4 files changed, 128 insertions(+), 125 deletions(-)


base-commit: dbaafe9cc56a996931eedfe043eb34418cc9cd9b
-- 
2.55.0