en Copyright 2015 Java http://kernelsources.org:8080/source/history/linux/rust/kernel/fwctl.rs#98f21c54f99519329c18e2625b0ea6db14524d09 Merge tag 'for-linus-fwctl' of git://git.kernel.org/pub/scm/linux/kernel/git/fwctl/fwctlPull fwctl updates from Jason Gunthorpe: - Support more commands in bnxt, this completes what they originally wanted to do - Rust bindings for fwctl. The Nova GPU is expected to use them next cycle* tag 'for-linus-fwctl' of git://git.kernel.org/pub/scm/linux/kernel/git/fwctl/fwctl: rust: introduce abstractions for fwctl fwctl/bnxt: Add DMA buffer support for HWRM commands bnxt_en: Update bnxt firmware spec List of files: /linux/rust/kernel/fwctl.rs Wed, 19 Aug 2026 21:51:36 +0200 Linus Torvalds <torvalds@linux-foundation.org> http://kernelsources.org:8080/source/history/linux/rust/kernel/fwctl.rs#e052daab94ee8c4081c91de3549772bd1c235729 rust: introduce abstractions for fwctlIntroduce safe Rust wrappers around struct fwctl_device and structfwctl_uctx. This lets Rust drivers register fwctl devices and implementfirmware RPC callbacks through a typed trait interface.The abstraction keeps lifetime and reference-count handling inside thewrapper, exposes pinned per-FD user contexts to drivers, and validates thelayout assumptions required by the C fwctl allocation model. Allocationsizes are padded so the kmalloc-backed C allocations also satisfy Rustalignment requirements.Registration owns driver private data with a lifetime tied to the boundparent device and verifies the parent identity before registration.Callbacks access that data through a higher-ranked closure, preventing itserased lifetime from escaping, while Device remains only the refcountedfwctl object. This avoids requiring Rust drop glue from the fwctl_devicerelease path after unregister or module teardown.RPC callbacks receive typed scope information, a mutable request/responsebuffer, and the userspace output-buffer size. Response pointer conversion,length validation, and raw output-length handling remain inside theabstraction.Add the Rust sources to the FWCTL MAINTAINERS entry and add myself as themaintainer for the Rust abstractions.Link: https://patch.msgid.link/r/20260813152312.1311142-2-zhiw@nvidia.comCo-developed-by: Danilo Krummrich <dakr@kernel.org>Signed-off-by: Danilo Krummrich <dakr@kernel.org>Signed-off-by: Zhi Wang <zhiw@nvidia.com>Reviewed-by: Alexandre Courbot <acourbot@nvidia.com>Signed-off-by: Jason Gunthorpe <jgg@nvidia.com> List of files: /linux/rust/kernel/fwctl.rs Thu, 13 Aug 2026 17:23:12 +0200 Zhi Wang <zhiw@nvidia.com>