[PATCH v10 14/18] kunit: defconfig: add defconfigs for building KUnit tests

[Brendan Higgins <brendanhiggins-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>]

Add defconfig for UML and a fragment that can be used to configure other
architectures for building KUnit tests. Add option to kunit_tool to use
a defconfig to create the kunitconfig.

Signed-off-by: Brendan Higgins <brendanhiggins-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>
Reviewed-by: Greg Kroah-Hartman <gregkh-hQyY1W1yCW8ekmWlsbkhG0B+6BGkLq7r@public.gmane.org>
Reviewed-by: Logan Gunthorpe <logang-OTvnGxWRz7hWk0Htik3J/w@public.gmane.org>
---
 arch/um/configs/kunit_defconfig              |  8 ++++++++
 tools/testing/kunit/configs/all_tests.config |  8 ++++++++
 tools/testing/kunit/kunit.py                 | 18 ++++++++++++++++--
 tools/testing/kunit/kunit_kernel.py          |  3 ++-
 4 files changed, 34 insertions(+), 3 deletions(-)
 create mode 100644 arch/um/configs/kunit_defconfig
 create mode 100644 tools/testing/kunit/configs/all_tests.config

diff --git a/arch/um/configs/kunit_defconfig b/arch/um/configs/kunit_defconfig
new file mode 100644
index 0000000000000..bfe49689038f1
--- /dev/null
+++ b/arch/um/configs/kunit_defconfig
@@ -0,0 +1,8 @@
+CONFIG_OF=y
+CONFIG_OF_UNITTEST=y
+CONFIG_OF_OVERLAY=y
+CONFIG_I2C=y
+CONFIG_I2C_MUX=y
+CONFIG_KUNIT=y
+CONFIG_KUNIT_TEST=y
+CONFIG_KUNIT_EXAMPLE_TEST=y
diff --git a/tools/testing/kunit/configs/all_tests.config b/tools/testing/kunit/configs/all_tests.config
new file mode 100644
index 0000000000000..bfe49689038f1
--- /dev/null
+++ b/tools/testing/kunit/configs/all_tests.config
@@ -0,0 +1,8 @@
+CONFIG_OF=y
+CONFIG_OF_UNITTEST=y
+CONFIG_OF_OVERLAY=y
+CONFIG_I2C=y
+CONFIG_I2C_MUX=y
+CONFIG_KUNIT=y
+CONFIG_KUNIT_TEST=y
+CONFIG_KUNIT_EXAMPLE_TEST=y
diff --git a/tools/testing/kunit/kunit.py b/tools/testing/kunit/kunit.py
index da11bd62a4b82..3e51dc4febfdc 100755
--- a/tools/testing/kunit/kunit.py
+++ b/tools/testing/kunit/kunit.py
@@ -11,6 +11,7 @@ import argparse
 import sys
 import os
 import time
+import shutil
 
 from collections import namedtuple
 from enum import Enum, auto
@@ -21,7 +22,7 @@ import kunit_parser
 
 KunitResult = namedtuple('KunitResult', ['status','result'])
 
-KunitRequest = namedtuple('KunitRequest', ['raw_output','timeout', 'jobs', 'build_dir'])
+KunitRequest = namedtuple('KunitRequest', ['raw_output','timeout', 'jobs', 'build_dir', 'defconfig'])
 
 class KunitStatus(Enum):
 	SUCCESS = auto()
@@ -29,8 +30,16 @@ class KunitStatus(Enum):
 	BUILD_FAILURE = auto()
 	TEST_FAILURE = auto()
 
+def create_default_kunitconfig():
+	if not os.path.exists(kunit_kernel.KUNITCONFIG_PATH):
+		shutil.copyfile('arch/um/configs/kunit_defconfig',
+				kunit_kernel.KUNITCONFIG_PATH)
+
 def run_tests(linux: kunit_kernel.LinuxSourceTree,
 	      request: KunitRequest) -> KunitResult:
+	if request.defconfig:
+		create_default_kunitconfig()
+
 	config_start = time.time()
 	success = linux.build_reconfig(request.build_dir)
 	config_end = time.time()
@@ -99,13 +108,18 @@ def main(argv, linux):
 				'directory.',
 				type=str, default=None, metavar='build_dir')
 
+	run_parser.add_argument('--defconfig',
+				help='Uses a default kunitconfig.',
+				action='store_true')
+
 	cli_args = parser.parse_args(argv)
 
 	if cli_args.subcommand == 'run':
 		request = KunitRequest(cli_args.raw_output,
 				       cli_args.timeout,
 				       cli_args.jobs,
-				       cli_args.build_dir)
+				       cli_args.build_dir,
+				       cli_args.defconfig)
 		result = run_tests(linux, request)
 		if result.status != KunitStatus.SUCCESS:
 			sys.exit(1)
diff --git a/tools/testing/kunit/kunit_kernel.py b/tools/testing/kunit/kunit_kernel.py
index 07c0abf2f47df..bf38768353313 100644
--- a/tools/testing/kunit/kunit_kernel.py
+++ b/tools/testing/kunit/kunit_kernel.py
@@ -14,6 +14,7 @@ import os
 import kunit_config
 
 KCONFIG_PATH = '.config'
+KUNITCONFIG_PATH = 'kunitconfig'
 
 class ConfigError(Exception):
 	"""Represents an error trying to configure the Linux kernel."""
@@ -81,7 +82,7 @@ class LinuxSourceTree(object):
 
 	def __init__(self):
 		self._kconfig = kunit_config.Kconfig()
-		self._kconfig.read_from_file('kunitconfig')
+		self._kconfig.read_from_file(KUNITCONFIG_PATH)
 		self._ops = LinuxSourceTreeOperations()
 
 	def clean(self):
-- 
2.22.0.510.g264f2c817a-goog