Hi all, this is my first attempt at adding Rust support to the media subsystem. It adds just enough support to write a clone of the virtio-camera prototype written by my colleague, Dmitry Osipenko, available at [0]. Basically, there's support for video_device_register, v4l2_device_register and for some ioctls in v4l2_ioctl_ops. There is also some initial vb2 support, alongside some wrappers for some types found in videodev2.h. I wrote a sample Rust driver just to prove that this probes, and that you get a message on dmesg whenever an ioctl is called. As there is no actual implementation for any of the ioctls, this module can misbehave with some programs. I can work around this in a future submission. Note that this is based on the rust branch, as opposed to rust-next. The reasoning is simple: I expect this series to just kickstart some discussion around the subject. Actual upstreaming can come up much later, at which point I can rebase on the rust branch. Lastly, the origins of this series trace back to a v4l2 virtIO driver I was writing in Rust. As the project was eventually shelved for other reasons, I picked both the virtIO and the v4l2 bindings into their own patches which I am now in the process of submitting. This is to say that I tested this code with said driver and CrosVM in the past, and it worked ok. Please let me know your thoughts. [0]: https://gitlab.collabora.com/dmitry.osipenko/linux-kernel-rd/-/commit/055a2c322e931a8b388f864f1db81bbdfd525602 Daniel Almeida (6): rust: media: add the media module rust: media: add initial videodev2.h abstractions rust: sync: introduce FfiMutex rust: media: videobuf2: add a videobuf2 abstraction rust: media: add {video|v4l2}_device_register support rust: media: add v4l2 rust sample rust/bindings/bindings_helper.h | 8 + rust/kernel/lib.rs | 2 + rust/kernel/media/mod.rs | 6 + rust/kernel/media/v4l2/capabilities.rs | 80 ++++ rust/kernel/media/v4l2/dev.rs | 369 +++++++++++++++ rust/kernel/media/v4l2/device.rs | 115 +++++ rust/kernel/media/v4l2/enums.rs | 135 ++++++ rust/kernel/media/v4l2/format.rs | 178 ++++++++ rust/kernel/media/v4l2/framesize.rs | 176 +++++++ rust/kernel/media/v4l2/inputs.rs | 104 +++++ rust/kernel/media/v4l2/ioctls.rs | 608 +++++++++++++++++++++++++ rust/kernel/media/v4l2/mmap.rs | 81 ++++ rust/kernel/media/v4l2/mod.rs | 13 + rust/kernel/media/videobuf2/core.rs | 552 ++++++++++++++++++++++ rust/kernel/media/videobuf2/mod.rs | 5 + rust/kernel/sync.rs | 1 + rust/kernel/sync/ffi_mutex.rs | 70 +++ samples/rust/Kconfig | 11 + samples/rust/Makefile | 1 + samples/rust/rust_v4l2.rs | 403 ++++++++++++++++ 20 files changed, 2918 insertions(+) create mode 100644 rust/kernel/media/mod.rs create mode 100644 rust/kernel/media/v4l2/capabilities.rs create mode 100644 rust/kernel/media/v4l2/dev.rs create mode 100644 rust/kernel/media/v4l2/device.rs create mode 100644 rust/kernel/media/v4l2/enums.rs create mode 100644 rust/kernel/media/v4l2/format.rs create mode 100644 rust/kernel/media/v4l2/framesize.rs create mode 100644 rust/kernel/media/v4l2/inputs.rs create mode 100644 rust/kernel/media/v4l2/ioctls.rs create mode 100644 rust/kernel/media/v4l2/mmap.rs create mode 100644 rust/kernel/media/v4l2/mod.rs create mode 100644 rust/kernel/media/videobuf2/core.rs create mode 100644 rust/kernel/media/videobuf2/mod.rs create mode 100644 rust/kernel/sync/ffi_mutex.rs create mode 100644 samples/rust/rust_v4l2.rs -- 2.40.0
