linux-kernel - [PATCH v2 2/3] docs: binderfs: add section about feature files

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Message-Id: <20210715031805.1725878-2-cmllamas@google.com>
Date:   Thu, 15 Jul 2021 03:18:04 +0000
From:   Carlos Llamas <cmllamas@...gle.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Arve Hjønnevåg" <arve@...roid.com>,
        Todd Kjos <tkjos@...roid.com>,
        Martijn Coenen <maco@...roid.com>,
        Christian Brauner <christian@...uner.io>
Cc:     Joel Fernandes <joel@...lfernandes.org>,
        Steven Moreland <smoreland@...gle.com>,
        kernel-team@...roid.com, linux-kernel@...r.kernel.org,
        Carlos Llamas <cmllamas@...gle.com>
Subject: [PATCH v2 2/3] docs: binderfs: add section about feature files

Document how binder feature files can be used to determine whether a
feature is supported by the binder driver. "oneway_spam_detection" is
used as an example as it is the first available feature file.

Signed-off-by: Carlos Llamas <cmllamas@...gle.com>
---
 Documentation/admin-guide/binderfs.rst | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/Documentation/admin-guide/binderfs.rst b/Documentation/admin-guide/binderfs.rst
index 199d84314a14..41a4db00df8d 100644
--- a/Documentation/admin-guide/binderfs.rst
+++ b/Documentation/admin-guide/binderfs.rst
@@ -72,3 +72,16 @@ that the `rm() <rm_>`_ tool can be used to delete them. Note that the
 ``binder-control`` device cannot be deleted since this would make the binderfs
 instance unusable.  The ``binder-control`` device will be deleted when the
 binderfs instance is unmounted and all references to it have been dropped.
+
+Binder features
+---------------
+
+Assuming an instance of binderfs has been mounted at ``/dev/binderfs``, the
+features supported by the binder driver can be located under
+``/dev/binderfs/features/``. The presence of individual files can be tested
+to determine whether a particular feature is supported by the driver.
+
+Example::
+
+        cat /dev/binderfs/features/oneway_spam_detection
+        1
-- 
2.32.0.93.g670b81a890-goog