From patchwork Fri Jun 7 15:28:31 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Benjamin Tissoires X-Patchwork-Id: 802869 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 91CEA19D079; Fri, 7 Jun 2024 15:28:58 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1717774138; cv=none; b=G4G+8gEUvkNsHiAvAp+ZSj+y+VAZVQXQSjIRGFSpJRSpBmzBX0LPx+60leAfxUcMEfxHylm+e1TOUSyU54xcesViKML3kugEDHhUJd7f1Di/X+0kDkqBkJWZaO3f4miDrt1mnn+zIyA6kx2CCQEw1IXFybXnav0ZpQCSVB45Kaw= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1717774138; c=relaxed/simple; bh=Ub7Vy/8HNvQPS41Xo0JZpRJdUsumnTmCiiNeoQ5mm4w=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=HiIxAzufZNXD0MNyEDphxRVhv9ZlPM+p+HUoIY+SfavmTa7AdeNHdz9Wg5gU+s1aoL8gZqDfUku6y65fYqWKSHtb3Ah4fujE4q6uM5nwgwlxyOEvjjqUhlRHTs7vXGN28WKNsDo8U5ZJEuabQe48I+dEuU1Jzdp8WvgOlOQPpZE= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=UAw7Y4Ck; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="UAw7Y4Ck" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 43373C4AF08; Fri, 7 Jun 2024 15:28:56 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1717774138; bh=Ub7Vy/8HNvQPS41Xo0JZpRJdUsumnTmCiiNeoQ5mm4w=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=UAw7Y4CkQzrR7JkwqjpIGuL2GLK33RFwaG6RmSWO1BVV2vlvFEXaqvpeNX66StPMi bBYq3Kv6GoByvDP38k9VhjSzuTBcaCqPLBJgtXKV+rzfI9Lb21yLuiYqfpBkftCyeu yWKYaDsAqXxXoNXVeG6jAoJQj1ZN1pVpQQ97fCJMwUccjrxALD2mQZZcOwIIufE/sj 1TlnCirKYyQWvbMoLiNDG8qqh+C0hKlFUmQv2AVD706ip1wg9KRgviW4f67kj4pnJ8 UcnQIlmXqdRBjEY3NoXA4fu/14TTVjY/GmwLz3imwlGGzTHjoCNIo9OnPKRTltlCpy K7NbN2HP98HCQ== From: Benjamin Tissoires Date: Fri, 07 Jun 2024 17:28:31 +0200 Subject: [PATCH HID v2 11/16] Documentation: HID: add a small blurb on udev-hid-bpf Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20240607-hid_bpf_struct_ops-v2-11-3f95f4d02292@kernel.org> References: <20240607-hid_bpf_struct_ops-v2-0-3f95f4d02292@kernel.org> In-Reply-To: <20240607-hid_bpf_struct_ops-v2-0-3f95f4d02292@kernel.org> To: Shuah Khan , Jiri Kosina , Jonathan Corbet , Alexei Starovoitov Cc: linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org, bpf@vger.kernel.org, linux-input@vger.kernel.org, linux-doc@vger.kernel.org, Benjamin Tissoires X-Mailer: b4 0.13.0 X-Developer-Signature: v=1; a=ed25519-sha256; t=1717774109; l=1805; i=bentiss@kernel.org; s=20230215; h=from:subject:message-id; bh=Ub7Vy/8HNvQPS41Xo0JZpRJdUsumnTmCiiNeoQ5mm4w=; b=tLjgFaE9QvQSzzvBBHEXCurid0JKHqKzRRDQuInJwpTJmhuRIPqoIR2ASYkWWJTyU/Nlz7Q0Z ZtehkP30kYZDUMvIohxdZxhSQNFMFQju66E+elnLey/+UIhzaOFFb8R X-Developer-Key: i=bentiss@kernel.org; a=ed25519; pk=7D1DyAVh6ajCkuUTudt/chMuXWIJHlv2qCsRkIizvFw= 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. Signed-off-by: Benjamin Tissoires --- no changes in v2 --- Documentation/hid/hid-bpf.rst | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) diff --git a/Documentation/hid/hid-bpf.rst b/Documentation/hid/hid-bpf.rst index 456e15097d87..8ae8f49801cb 100644 --- a/Documentation/hid/hid-bpf.rst +++ b/Documentation/hid/hid-bpf.rst @@ -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 `_. + +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 ===========================