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authorRae Moar <rmoar@google.com>2023-12-13 22:44:21 +0300
committerShuah Khan <skhan@linuxfoundation.org>2023-12-18 23:28:08 +0300
commite9f0e21ceb65ea5e450ede7c9b9a5bfc90a403ae (patch)
tree34d764e915a18b6b237d52c35b1599d6e1b82901 /Documentation/dev-tools
parentc72a870926c2de694942aaac2b49e59ce789bb74 (diff)
downloadlinux-e9f0e21ceb65ea5e450ede7c9b9a5bfc90a403ae.tar.xz
Documentation: Add debugfs docs with run after boot
Expand the documentation on the KUnit debugfs filesystem on the run_manual.rst page. Add section describing how to access results using debugfs. Add section describing how to run tests after boot using debugfs. Reviewed-by: David Gow <davidgow@google.com> Signed-off-by: Rae Moar <rmoar@google.com> Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
Diffstat (limited to 'Documentation/dev-tools')
-rw-r--r--Documentation/dev-tools/kunit/run_manual.rst51
1 files changed, 47 insertions, 4 deletions
diff --git a/Documentation/dev-tools/kunit/run_manual.rst b/Documentation/dev-tools/kunit/run_manual.rst
index e7b46421f247..699d92885075 100644
--- a/Documentation/dev-tools/kunit/run_manual.rst
+++ b/Documentation/dev-tools/kunit/run_manual.rst
@@ -49,9 +49,52 @@ loaded.
The results will appear in TAP format in ``dmesg``.
+debugfs
+=======
+
+KUnit can be accessed from userspace via the debugfs filesystem (See more
+information about debugfs at Documentation/filesystems/debugfs.rst).
+
+If ``CONFIG_KUNIT_DEBUGFS`` is enabled, the KUnit debugfs filesystem is
+mounted at /sys/kernel/debug/kunit. You can use this filesystem to perform
+the following actions.
+
+Retrieve Test Results
+=====================
+
+You can use debugfs to retrieve KUnit test results. The test results are
+accessible from the debugfs filesystem in the following read-only file:
+
+.. code-block :: bash
+
+ /sys/kernel/debug/kunit/<test_suite>/results
+
+The test results are printed in a KTAP document. Note this document is separate
+to the kernel log and thus, may have different test suite numbering.
+
+Run Tests After Kernel Has Booted
+=================================
+
+You can use the debugfs filesystem to trigger built-in tests to run after
+boot. To run the test suite, you can use the following command to write to
+the ``/sys/kernel/debug/kunit/<test_suite>/run`` file:
+
+.. code-block :: bash
+
+ echo "any string" > /sys/kernel/debugfs/kunit/<test_suite>/run
+
+As a result, the test suite runs and the results are printed to the kernel
+log.
+
+However, this feature is not available with KUnit suites that use init data,
+because init data may have been discarded after the kernel boots. KUnit
+suites that use init data should be defined using the
+kunit_test_init_section_suites() macro.
+
+Also, you cannot use this feature to run tests concurrently. Instead a test
+will wait to run until other tests have completed or failed.
+
.. note ::
- If ``CONFIG_KUNIT_DEBUGFS`` is enabled, KUnit test results will
- be accessible from the ``debugfs`` filesystem (if mounted).
- They will be in ``/sys/kernel/debug/kunit/<test_suite>/results``, in
- TAP format.
+ For test authors, to use this feature, tests will need to correctly initialise
+ and/or clean up any data, so the test runs correctly a second time.