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docs: binderfs: add section about feature files

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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.

Acked-by: Christian Brauner <christian.brauner@ubuntu.com>
Signed-off-by: Carlos Llamas <cmllamas@google.com>
Link: https://lore.kernel.org/r/20210715031805.1725878-2-cmllamas@google.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Carlos Llamas 2021-07-15 03:18:04 +00:00 committed by Greg Kroah-Hartman
parent fc470abf54
commit 06e1721d2a
1 changed files with 13 additions and 0 deletions
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13
Documentation/admin-guide/binderfs.rst
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@ -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
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