[PATCH v9 0/1] Rust PCI capability infrastructure and SR-IOV support

[Zhi Wang <zhiw@nvidia.com>]

This is a follow-up to v8 [1].

The patch adds typed PCIe extended-capability lookup to the Rust PCI
abstraction and an SR-IOV layout used by the nova-core vGPU boot work.

This series is based on current mainline. That base provides the existing
num::casts helpers but not const_as!, so the const narrowing call uses the
temporary turbofish form discussed during review. It can be converted as
part of the subsequent const_as! migration before the old helper is
removed.

Changes since v8:
- Made all raw ExtSriovRegs fields private. (Danilo)
- Added a read-only first_vf_offset() accessor for the GSP ABI and
  documented why pci_iov_virtfn_devfn() cannot replace it. (Danilo, Zhi)
- Simplified VF BAR decoding using a slot iterator and removed
  ExtSriovVfBars. (Alexandre, Danilo)
- Explained why I/O-space VF BAR encodings are rejected. (Alexandre)
- Clarified that decoded BAR addresses are PCI bus addresses. (Zhi)
- Removed unused ExtCapId::new() and kept as_raw() private. (Danilo)
- Replaced documented integer casts with the num::casts helpers available
  in current mainline. (Alexandre)
- Rebased onto current mainline.

[1] https://lore.kernel.org/rust-for-linux/20260818084633.1673214-1-zhiw@nvidia.com/

Zhi Wang (1):
  rust: pci: add extended capability and SR-IOV support

 rust/helpers/pci.c     |   5 +
 rust/kernel/pci.rs     |   8 ++
 rust/kernel/pci/cap.rs | 290 +++++++++++++++++++++++++++++++++++++++++
 3 files changed, 303 insertions(+)
 create mode 100644 rust/kernel/pci/cap.rs


base-commit: 45c13f3f9e3bb15fd89ff2864c6f627a3b4b4229
-- 
2.53.0