On Mon, Mar 27, 2023 at 03:21:53PM -0700, Stephen Boyd wrote:
Test the KUnit test managed overlay APIs. Confirm that platform devices are created and destroyed properly. This provides us confidence that the test managed work correctly and can be relied upon to provide tests with fake platform devices and device nodes via overlays compiled into the kernel image.
Cc: Rob Herring robh+dt@kernel.org Cc: Frank Rowand frowand.list@gmail.com Signed-off-by: Stephen Boyd sboyd@kernel.org
drivers/of/.kunitconfig | 2 + drivers/of/Kconfig | 10 +++ drivers/of/Makefile | 1 + drivers/of/kunit_overlay_test.dtso | 9 +++ drivers/of/overlay_test.c | 110 +++++++++++++++++++++++++++++ 5 files changed, 132 insertions(+) create mode 100644 drivers/of/kunit_overlay_test.dtso create mode 100644 drivers/of/overlay_test.c
diff --git a/drivers/of/.kunitconfig b/drivers/of/.kunitconfig index 5a8fee11978c..7d570cb922a1 100644 --- a/drivers/of/.kunitconfig +++ b/drivers/of/.kunitconfig @@ -1,3 +1,5 @@ CONFIG_KUNIT=y CONFIG_OF=y CONFIG_OF_KUNIT_TEST=y +CONFIG_OF_OVERLAY=y +CONFIG_OF_OVERLAY_KUNIT_TEST=y diff --git a/drivers/of/Kconfig b/drivers/of/Kconfig index 1b995cecf5be..5bdeba11268d 100644 --- a/drivers/of/Kconfig +++ b/drivers/of/Kconfig @@ -113,6 +113,16 @@ config OF_OVERLAY While this option is selected automatically when needed, you can enable it manually to improve device tree unit test coverage. +config OF_OVERLAY_KUNIT_TEST
- tristate "Device Tree overlay KUnit tests" if !KUNIT_ALL_TESTS
- depends on OF_OVERLAY
- depends on KUNIT
- default KUNIT_ALL_TESTS
- help
This option builds KUnit unit tests for the device tree overlay code.If unsure, say N here, but this option is safe to enable.config OF_NUMA bool diff --git a/drivers/of/Makefile b/drivers/of/Makefile index c694f998b9f5..2ad60d5b87ac 100644 --- a/drivers/of/Makefile +++ b/drivers/of/Makefile @@ -21,5 +21,6 @@ endif obj-$(CONFIG_KUNIT) += of_kunit.o obj-$(CONFIG_OF_KUNIT_TEST) += of_test.o +obj-$(CONFIG_OF_OVERLAY_KUNIT_TEST) += overlay_test.o kunit_overlay_test.dtbo.o obj-$(CONFIG_OF_UNITTEST) += unittest-data/ diff --git a/drivers/of/kunit_overlay_test.dtso b/drivers/of/kunit_overlay_test.dtso new file mode 100644 index 000000000000..85f20b4b4c16 --- /dev/null +++ b/drivers/of/kunit_overlay_test.dtso @@ -0,0 +1,9 @@ +// SPDX-License-Identifier: GPL-2.0 +/dts-v1/; +/plugin/;
+&{/} {
- kunit-test {
compatible = "test,empty";- };
+}; diff --git a/drivers/of/overlay_test.c b/drivers/of/overlay_test.c new file mode 100644 index 000000000000..66b1dceea568 --- /dev/null +++ b/drivers/of/overlay_test.c @@ -0,0 +1,110 @@ +// SPDX-License-Identifier: GPL-2.0 +/*
- KUnit tests for device tree overlays
- */
+#include <linux/device/bus.h> +#include <linux/kconfig.h> +#include <linux/of.h> +#include <linux/platform_device.h>
+#include <kunit/of.h> +#include <kunit/test.h>
+static const char * const kunit_node_name = "kunit-test"; +static const char * const kunit_compatible = "test,empty";
+/* Test that of_overlay_apply_kunit() adds a node to the live tree */ +static void of_overlay_apply_kunit_apply(struct kunit *test) +{
- struct device_node *np;
- KUNIT_ASSERT_EQ(test, 0,
of_overlay_apply_kunit(test, kunit_overlay_test));- np = of_find_node_by_name(NULL, kunit_node_name);
- KUNIT_EXPECT_NOT_ERR_OR_NULL(test, np);
- of_node_put(np);
+}
+static int bus_match_np(struct device *dev, const void *data) +{
- const struct device_node *np = data;
- return np == dev->of_node;
+}
+/*
- Test that of_overlay_apply_kunit() creates platform devices with the
- expected device_node
- */
+static void of_overlay_apply_kunit_platform_device(struct kunit *test) +{
- struct device *dev;
- struct device_node *np;
- KUNIT_ASSERT_EQ(test, 0,
of_overlay_apply_kunit(test, kunit_overlay_test));- np = of_find_node_by_name(NULL, kunit_node_name);
- of_node_put_kunit(test, np);
- KUNIT_ASSERT_NOT_ERR_OR_NULL(test, np);
- dev = bus_find_device(&platform_bus_type, NULL, np, bus_match_np);
of_find_device_by_node()
- KUNIT_EXPECT_NOT_ERR_OR_NULL(test, dev);
- put_device(dev);
+}
+static int of_overlay_bus_match_compatible(struct device *dev, const void *data) +{
- return of_device_is_compatible(dev->of_node, data);
+}
+/* Test that of_overlay_apply_kunit() cleans up after the test is finished */ +static void of_overlay_apply_kunit_cleanup(struct kunit *test) +{
- struct device *dev;
- struct device_node *np;
- KUNIT_ASSERT_EQ(test, 0,
of_overlay_apply_kunit(test, kunit_overlay_test));- np = of_find_node_by_name(NULL, kunit_node_name);
- of_node_put(np); /* Not derefing 'np' after this */
- KUNIT_ASSERT_NOT_ERR_OR_NULL(test, np);
- dev = bus_find_device(&platform_bus_type, NULL, np, bus_match_np);
And here.
- put_device(dev); /* Not derefing 'device' after this */
- KUNIT_ASSERT_NOT_ERR_OR_NULL(test, dev);
- /* Remove overlay */
- kunit_cleanup(test);
I guess this is testing the cleanup. It's not that obvious given the overlay is removed by kunit_cleanup(). Not sure if anything can be done though...
- np = of_find_node_by_name(NULL, kunit_node_name);
- KUNIT_EXPECT_PTR_EQ(test, NULL, np);
- of_node_put(np);
- dev = bus_find_device(&platform_bus_type, NULL, kunit_compatible,
of_overlay_bus_match_compatible);- KUNIT_EXPECT_PTR_EQ(test, NULL, dev);
- put_device(dev);
+}
+static struct kunit_case of_overlay_apply_kunit_test_cases[] = {
- KUNIT_CASE(of_overlay_apply_kunit_apply),
- KUNIT_CASE(of_overlay_apply_kunit_platform_device),
- KUNIT_CASE(of_overlay_apply_kunit_cleanup),
- {}
+};
+/*
- Test suite for test managed device tree overlays.
- */
+static struct kunit_suite of_overlay_apply_kunit_suite = {
- .name = "of_overlay_apply_kunit",
- .test_cases = of_overlay_apply_kunit_test_cases,
+};
+kunit_test_suites(
- &of_overlay_apply_kunit_suite,
+);
+MODULE_LICENSE("GPL");
https://git.kernel.org/pub/scm/linux/kernel/git/clk/linux.git/ https://git.kernel.org/pub/scm/linux/kernel/git/sboyd/spmi.git