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Date:   Thu, 15 Jul 2021 09:08:19 -0700
Message-Id: <20210715160819.1107685-1-dlatypov@google.com>
Mime-Version: 1.0
Subject: [PATCH v3] kunit: tool: add --kernel_args to allow setting module params
From:   Daniel Latypov <dlatypov@google.com>
To:     brendanhiggins@google.com, davidgow@google.com
Cc:     linux-kernel@vger.kernel.org, kunit-dev@googlegroups.com,
        linux-kselftest@vger.kernel.org, skhan@linuxfoundation.org,
        Daniel Latypov <dlatypov@google.com>
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Precedence: bulk

kunit.py currently does not make it possible for users to specify module
parameters (/kernel arguments more generally) unless one directly tweaks
the kunit.py code itself.

This hasn't mattered much so far, but this would make it easier to port
existing tests that expose module parameters over to KUnit and/or let
current KUnit tests take advantage of them.

Tested using an kunit internal parameter:
$ ./tools/testing/kunit/kunit.py run --kunitconfig=lib/kunit \
    --kernel_args=kunit.filter_glob=kunit_status
...
Testing complete. 2 tests run. 0 failed. 0 crashed. 0 skipped.

Signed-off-by: Daniel Latypov <dlatypov@google.com>
---
v1 -> v2:
s/kernel_arg/kernel_args in documentation
v2 -> v3:
Fix up kunit_tool_test.py, add a test case.
---
 .../dev-tools/kunit/running_tips.rst          | 10 ++++++++++
 tools/testing/kunit/kunit.py                  | 16 +++++++++++----
 tools/testing/kunit/kunit_tool_test.py        | 20 +++++++++++++------
 3 files changed, 36 insertions(+), 10 deletions(-)

diff --git a/Documentation/dev-tools/kunit/running_tips.rst b/Documentation/dev-tools/kunit/running_tips.rst
index 7d99386cf94a..ebaaa2764207 100644
--- a/Documentation/dev-tools/kunit/running_tips.rst
+++ b/Documentation/dev-tools/kunit/running_tips.rst
@@ -80,6 +80,16 @@ file ``.kunitconfig``, you can just pass in the dir, e.g.
 	automagically, but tests could theoretically depend on incompatible
 	options, so handling that would be tricky.
 
+Setting kernel commandline parameters
+-------------------------------------
+
+You can use ``--kernel_args`` to pass arbitrary kernel arguments, e.g.
+
+.. code-block:: bash
+
+	$ ./tools/testing/kunit/kunit.py run --kernel_args=param=42 --kernel_args=param2=false
+
+
 Generating code coverage reports under UML
 ------------------------------------------
 
diff --git a/tools/testing/kunit/kunit.py b/tools/testing/kunit/kunit.py
index be8d8d4a4e08..03f3bc406955 100755
--- a/tools/testing/kunit/kunit.py
+++ b/tools/testing/kunit/kunit.py
@@ -28,12 +28,13 @@ KunitBuildRequest = namedtuple('KunitBuildRequest',
 			       ['jobs', 'build_dir', 'alltests',
 				'make_options'])
 KunitExecRequest = namedtuple('KunitExecRequest',
-			      ['timeout', 'build_dir', 'alltests', 'filter_glob'])
+                              ['timeout', 'build_dir', 'alltests',
+                               'filter_glob', 'kernel_args'])
 KunitParseRequest = namedtuple('KunitParseRequest',
 			       ['raw_output', 'input_data', 'build_dir', 'json'])
 KunitRequest = namedtuple('KunitRequest', ['raw_output','timeout', 'jobs',
 					   'build_dir', 'alltests', 'filter_glob',
-					   'json', 'make_options'])
+					   'kernel_args', 'json', 'make_options'])
 
 KernelDirectoryPath = sys.argv[0].split('tools/testing/kunit/')[0]
 
@@ -92,6 +93,7 @@ def exec_tests(linux: kunit_kernel.LinuxSourceTree,
 	kunit_parser.print_with_timestamp('Starting KUnit Kernel ...')
 	test_start = time.time()
 	result = linux.run_kernel(
+		args=request.kernel_args,
 		timeout=None if request.alltests else request.timeout,
                 filter_glob=request.filter_glob,
 		build_dir=request.build_dir)
@@ -150,7 +152,8 @@ def run_tests(linux: kunit_kernel.LinuxSourceTree,
 		return build_result
 
 	exec_request = KunitExecRequest(request.timeout, request.build_dir,
-					request.alltests, request.filter_glob)
+				 request.alltests, request.filter_glob,
+				 request.kernel_args)
 	exec_result = exec_tests(linux, exec_request)
 	if exec_result.status != KunitStatus.SUCCESS:
 		return exec_result
@@ -236,6 +239,9 @@ def add_exec_opts(parser) -> None:
 			    nargs='?',
 			    default='',
 			    metavar='filter_glob')
+	parser.add_argument('--kernel_args',
+			    help='Kernel command-line parameters. Maybe be repeated',
+			     action='append')
 
 def add_parse_opts(parser) -> None:
 	parser.add_argument('--raw_output', help='don\'t format output from kernel',
@@ -307,6 +313,7 @@ def main(argv, linux=None):
 				       cli_args.build_dir,
 				       cli_args.alltests,
 				       cli_args.filter_glob,
+				       cli_args.kernel_args,
 				       cli_args.json,
 				       cli_args.make_options)
 		result = run_tests(linux, request)
@@ -361,7 +368,8 @@ def main(argv, linux=None):
 		exec_request = KunitExecRequest(cli_args.timeout,
 						cli_args.build_dir,
 						cli_args.alltests,
-						cli_args.filter_glob)
+						cli_args.filter_glob,
+						cli_args.kernel_args)
 		exec_result = exec_tests(linux, exec_request)
 		parse_request = KunitParseRequest(cli_args.raw_output,
 						  exec_result.result,
diff --git a/tools/testing/kunit/kunit_tool_test.py b/tools/testing/kunit/kunit_tool_test.py
index bdae0e5f6197..93fda23f446c 100755
--- a/tools/testing/kunit/kunit_tool_test.py
+++ b/tools/testing/kunit/kunit_tool_test.py
@@ -346,7 +346,7 @@ class KUnitMainTest(unittest.TestCase):
 		self.assertEqual(self.linux_source_mock.build_reconfig.call_count, 0)
 		self.assertEqual(self.linux_source_mock.run_kernel.call_count, 1)
 		self.linux_source_mock.run_kernel.assert_called_once_with(
-			build_dir='.kunit', filter_glob='', timeout=300)
+			args=None, build_dir='.kunit', filter_glob='', timeout=300)
 		self.print_mock.assert_any_call(StrContains('Testing complete.'))
 
 	def test_run_passes_args_pass(self):
@@ -354,7 +354,7 @@ class KUnitMainTest(unittest.TestCase):
 		self.assertEqual(self.linux_source_mock.build_reconfig.call_count, 1)
 		self.assertEqual(self.linux_source_mock.run_kernel.call_count, 1)
 		self.linux_source_mock.run_kernel.assert_called_once_with(
-			build_dir='.kunit', filter_glob='', timeout=300)
+			args=None, build_dir='.kunit', filter_glob='', timeout=300)
 		self.print_mock.assert_any_call(StrContains('Testing complete.'))
 
 	def test_exec_passes_args_fail(self):
@@ -393,7 +393,7 @@ class KUnitMainTest(unittest.TestCase):
 		timeout = 3453
 		kunit.main(['exec', '--timeout', str(timeout)], self.linux_source_mock)
 		self.linux_source_mock.run_kernel.assert_called_once_with(
-			build_dir='.kunit', filter_glob='', timeout=timeout)
+			args=None, build_dir='.kunit', filter_glob='', timeout=timeout)
 		self.print_mock.assert_any_call(StrContains('Testing complete.'))
 
 	def test_run_timeout(self):
@@ -401,7 +401,7 @@ class KUnitMainTest(unittest.TestCase):
 		kunit.main(['run', '--timeout', str(timeout)], self.linux_source_mock)
 		self.assertEqual(self.linux_source_mock.build_reconfig.call_count, 1)
 		self.linux_source_mock.run_kernel.assert_called_once_with(
-			build_dir='.kunit', filter_glob='', timeout=timeout)
+			args=None, build_dir='.kunit', filter_glob='', timeout=timeout)
 		self.print_mock.assert_any_call(StrContains('Testing complete.'))
 
 	def test_run_builddir(self):
@@ -409,7 +409,7 @@ class KUnitMainTest(unittest.TestCase):
 		kunit.main(['run', '--build_dir=.kunit'], self.linux_source_mock)
 		self.assertEqual(self.linux_source_mock.build_reconfig.call_count, 1)
 		self.linux_source_mock.run_kernel.assert_called_once_with(
-			build_dir=build_dir, filter_glob='', timeout=300)
+			args=None, build_dir=build_dir, filter_glob='', timeout=300)
 		self.print_mock.assert_any_call(StrContains('Testing complete.'))
 
 	def test_config_builddir(self):
@@ -426,7 +426,7 @@ class KUnitMainTest(unittest.TestCase):
 		build_dir = '.kunit'
 		kunit.main(['exec', '--build_dir', build_dir], self.linux_source_mock)
 		self.linux_source_mock.run_kernel.assert_called_once_with(
-			build_dir=build_dir, filter_glob='', timeout=300)
+			args=None, build_dir=build_dir, filter_glob='', timeout=300)
 		self.print_mock.assert_any_call(StrContains('Testing complete.'))
 
 	@mock.patch.object(kunit_kernel, 'LinuxSourceTree')
@@ -451,5 +451,13 @@ class KUnitMainTest(unittest.TestCase):
 							cross_compile=None,
 							qemu_config_path=None)
 
+	def test_run_kernel_args(self):
+		kunit.main(['run', '--kernel_args=a=1', '--kernel_args=b=2'], self.linux_source_mock)
+		self.assertEqual(self.linux_source_mock.build_reconfig.call_count, 1)
+		self.linux_source_mock.run_kernel.assert_called_once_with(
+		      args=['a=1','b=2'], build_dir='.kunit', filter_glob='', timeout=300)
+		self.print_mock.assert_any_call(StrContains('Testing complete.'))
+
+
 if __name__ == '__main__':
 	unittest.main()

base-commit: 8096acd7442e613fad0354fc8dfdb2003cceea0b
-- 
2.32.0.93.g670b81a890-goog