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The original design relied on the firmware loading interface,\nbut fwctl is a more natural fit for this use case, as it is designed for\nuploading configuration or firmware data required before the device becomes\noperational.\n\nThis patch introduces a Rust abstraction over the fwctl subsystem,\nproviding safe and idiomatic bindings.\n\nThe new `fwctl` module allows Rust drivers to integrate with the existing\nC-side fwctl core through a typed trait interface. It provides:\n\n - `Operations` trait — defines driver-specific callbacks: `open()`,\n `close()`, `info()`, and `fw_rpc()`. The implementing type itself\n serves as the per-FD user context, one instance per open().\n\n - `Device` — wraps `struct fwctl_device` with embedded driver-\n specific data (`T::DeviceData`).\n\n - `Registration` — safe registration and automatic unregistration\n of `struct fwctl_device` objects, living inside `Devres` to ensure\n teardown before the parent device unbinds.\n\n - `RpcScope` / `FwRpcResponse` — type-safe enums for RPC scope and\n response handling, keeping unsafe pointer manipulation confined to\n the abstraction layer.\n\n`rust/kernel/lib.rs` is updated to conditionally include this module\nunder `CONFIG_FWCTL`.\n\nThe repo with the patches can be found at [2].\n\nv3:\n\nQuite some updates in this version. Here you can find the example\nnova-core fwctl driver [3]. The interface is still WIP so it is just to\ndemonstrate the use of the rust fwctl abstractions.\n\nComments from folks:\n\n- Use an enum for the return of fw_rpc. (Joel)\n- Remove FWCTL_DEVICE_TYPE_RUST_FWCTL_TEST together with the sample\n driver. (Jason)\n- Remove DeviceType:Error. (Gary)\n- Add __rust_helper for fwctl_get/fwctl_put. (Gary)\n- Refine the design of the device private data. Now it has a similar\n device private data structure as DRM. (Danilo)\n- Separate fwctl alloc and register in the abstractions. (Jason)\n- Registration::new() now takes &fwctl::Device and the parent\n &Device to align with other class device abstractions. (Danilo)\n- Update the Registration SAFETY comments. (Danilo & Jason)\n- Take self as per-FD user context in callbacks. (Danilo)\n- {open, close}_uctx -> {open, close}(). open() now takes &Device.\n (Danilo)\n\nUpdates from me:\n\n- Introduce enums for fwctl RPC scope.\n- Introduce AlwaysRefCounted to avoid hacks after introducing the\n refined flow of device private data.\n- Introduce default implementation of close()/info().\n- Fix a leak: Drop T::UserCtx in the close_uctx_callback explicitly.\n\nv2:\n\n- Don't open fwctl_put(). Add a rust helper. (Jason/Danilo)\n- Wrap Registration with Devres to guarantee proper lifetime management.\n (Jason/Danilo)\n- Rename FwctlOps to Operations, FwctlUserCtx to UserCtx, FwctlDevice to\n Device. (Danilo)\n- Use fwctl::DeviceType enum instead of raw u32 for DEVICE_TYPE. (Danilo)\n- Change fwctl_uctx field in UserCtx to Opaque and\n make it private. (Danilo)\n- Provide Deref and DerefMut implementations for UserCtx::uctx. (Danilo)\n- Add UserCtx::parent_device_from_raw() to simplify parent device access.\n- Use cast() and cast_mut() instead of manual pointer casts. (Danilo)\n- Implement AlwaysRefCounted for Device and use ARef in\n Registration. (Danilo)\n- Add rust_helper_fwctl_get() for reference counting.\n- Improve safety comments for slice::from_raw_parts_mut() in\n fw_rpc_callback. (Danilo)\n- Convert imports to vertical style.\n- Fix all clippy warnings.\n\nv1:\n\n- Initial submission introducing fwctl Rust abstractions.\n\n[1] https://lore.kernel.org/all/20250903221111.3866249-1-zhiw@nvidia.com/\n[2] https://github.com/zhiwang-nvidia/driver-core/tree/fwctl-rust-abstraction-v3\n[3] https://github.com/zhiwang-nvidia/nova-core/commit/2068da7e8caf58da9584b0aa6c81fed8f547d59f\n\nZhi Wang (1):\n rust: introduce abstractions for fwctl\n\n drivers/fwctl/Kconfig | 12 +\n rust/bindings/bindings_helper.h | 1 +\n rust/helpers/fwctl.c | 17 ++\n rust/helpers/helpers.c | 3 +-\n rust/kernel/fwctl.rs | 449 ++++++++++++++++++++++++++++++++\n rust/kernel/lib.rs | 2 +\n 6 files changed, 483 insertions(+), 1 deletion(-)\n create mode 100644 rust/helpers/fwctl.c\n create mode 100644 rust/kernel/fwctl.rs"}