currently the rust `Io` type maps to the c read{b, w, l, q}/write{b, w, l, q}
functions and have no support for port io. this can be a problem for pci::Bar
because the pointer returned by pci_iomap can be either PIO or MMIO [0].this patch series splits the `Io` type into `Io`, and `MMIo`. `Io` can be used to access PIO or MMIO. `MMIo` can only access memory mapped IO but might, depending on the arch, be faster than `Io`. and updates pci::Bar, so that it is generic over Io and, a user can optionally give a compile time hint about the type of io. Link: https://docs.kernel.org/6.11/driver-api/pci/pci.html#c.pci_iomap [0] changes in v2: - remove `PortIo` - typo fixes - squash "fixup" patches so that patches will not introduce build fails - move some changes across patches so that build will not fail - changes macro define in rust/helpers/io.c to use full rust name - specialize `io_backend` for the x86 case - do not modify lib/iomap.c - rebased on v6.15-rc6 Link to v1: https://lore.kernel.org/rust-for-linux/20250509031524.2604087-1-andrewjballa...@gmail.com/ Andrew Ballance (3): rust: io: add new Io type rust: io: add from_raw_cookie functions rust: pci: make Bar generic over Io Fiona Behrens (3): rust: helpers: io: use macro to generate io accessor functions rust: io: make Io use IoAccess trait rust: io: implement Debug for IoRaw and add some doctests drivers/gpu/nova-core/driver.rs | 4 +- drivers/gpu/nova-core/regs.rs | 1 + rust/helpers/io.c | 112 ++---- rust/kernel/devres.rs | 4 +- rust/kernel/io.rs | 645 +++++++++++++++++++++++--------- rust/kernel/pci.rs | 101 +++-- samples/rust/rust_driver_pci.rs | 6 +- 7 files changed, 595 insertions(+), 278 deletions(-) base-commit: 82f2b0b97b36ee3fcddf0f0780a9a0825d52fec3 -- 2.49.0
