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Documentation: HID: add a small blurb on udev-hid-bpf

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This is the current decision we took: we don't provide automatic loading
of HID-BPF by the kernel directly, but rely on an external tool for it.

This tool is currently udev-hid-bpf, so let's make people aware of it.

Link: https://lore.kernel.org/r/20240608-hid_bpf_struct_ops-v3-11-6ac6ade58329@kernel.org
Signed-off-by: Benjamin Tissoires <bentiss@kernel.org>
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Benjamin Tissoires 2024-06-08 11:01:23 +02:00
parent c5958697a5
commit 5f42e19de5
1 changed files with 17 additions and 0 deletions
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Documentation/hid/hid-bpf.rst
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@ -129,6 +129,23 @@ When a BPF program needs to emit input events, it needs to talk with the HID
protocol, and rely on the HID kernel processing to translate the HID data into
input events.
In-tree HID-BPF programs and ``udev-hid-bpf``
=============================================
Official device fixes are shipped in the kernel tree as source in the
``drivers/hid/bpf/progs`` directory. This allows to add selftests to them in
``tools/testing/selftests/hid``.
However, the compilation of these objects is not part of a regular kernel compilation
given that they need an external tool to be loaded. This tool is currently
`udev-hid-bpf <https://libevdev.pages.freedesktop.org/udev-hid-bpf/index.html>`_.
For convenience, that external repository duplicates the files from here in
``drivers/hid/bpf/progs`` into its own ``src/bpf/stable`` directory. This allows
distributions to not have to pull the entire kernel source tree to ship and package
those HID-BPF fixes. ``udev-hid-bpf`` also has capabilities of handling multiple
objects files depending on the kernel the user is running.
Available types of programs
===========================