These patches extract and enhance the bitfield support in the register macro in nova to define Rust structures with bitfields. This is extremely useful as it allows clean Rust structure definitions without requiring explicit masks and shifts.
See [1] example code using it. [1] https://git.kernel.org/pub/scm/linux/kernel/git/jfern/linux.git/patch/?id=76797b31facae8f1a1be139412c78568df1da9f3 v2 of the patches is at: https://lore.kernel.org/all/20250903215428.1296517-1-joelagn...@nvidia.com/ v1 of the patches is at: https://lore.kernel.org/all/20250824135954.2243774-1-joelagn...@nvidia.com/ v2->v3: * Renamed bitstruct to bitfield. * Various suggestions to improve code (Alex, Yury, Miguel). * Added reviewed-by tags from Elle Rhumsaa. * Added KUNIT tests including tests for overlap. * Added F: maintainers file entry for new files under BITOPS. v1->v2: * Use build_assert in bitstruct * Split move and enhance patches for easier review * Move out of Nova into kernel crate for other drivers like Tyr which will use. * Miscellaneous cosmetic improvements. Joel Fernandes (5): nova-core: bitfield: Move bitfield-specific code from register! into new macro nova-core: bitfield: Add support for different storage widths nova-core: bitfield: Add support for custom visiblity rust: Move register and bitfield macros out of Nova rust: Add KUNIT tests for bitfield MAINTAINERS | 1 + drivers/gpu/nova-core/falcon.rs | 2 +- drivers/gpu/nova-core/falcon/gsp.rs | 3 +- drivers/gpu/nova-core/falcon/sec2.rs | 2 +- drivers/gpu/nova-core/regs.rs | 6 +- rust/kernel/bits.rs | 2 + rust/kernel/bits/bitfield.rs | 661 ++++++++++++++++++ rust/kernel/io.rs | 1 + .../macros.rs => rust/kernel/io/register.rs | 289 +------- 9 files changed, 698 insertions(+), 269 deletions(-) create mode 100644 rust/kernel/bits/bitfield.rs rename drivers/gpu/nova-core/regs/macros.rs => rust/kernel/io/register.rs (73%) -- 2.34.1
