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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.

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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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 ``binder-control`` device cannot be deleted since this would make the binderfs
instance unusable. The ``binder-control`` device will be deleted when the instance unusable. The ``binder-control`` device will be deleted when the
binderfs instance is unmounted and all references to it have been dropped. 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