Introduce KUnit resource wrappers around platform_driver_register(), platform_device_alloc(), and platform_device_add() so that test authors can register platform drivers/devices from their tests and have the drivers/devices automatically be unregistered when the test is done.
This makes test setup code simpler when a platform driver or platform device is needed. Add a few test cases at the same time to make sure the APIs work as intended.
Cc: Brendan Higgins brendan.higgins@linux.dev Cc: David Gow davidgow@google.com Cc: Greg Kroah-Hartman gregkh@linuxfoundation.org Cc: "Rafael J. Wysocki" rafael@kernel.org Signed-off-by: Stephen Boyd sboyd@kernel.org ---
Should this be moved to drivers/base/ and called platform_kunit.c? The include/kunit/platform_driver.h could also be kunit/platform_device.h to match linux/platform_device.h if that is more familiar.
And I'm not super certain about allocating a driver structure and embedding it in a wrapper struct. Maybe the code should just use kunit_get_current_test() instead?
include/kunit/platform_driver.h | 15 +++ lib/kunit/Makefile | 6 + lib/kunit/platform_driver-test.c | 107 ++++++++++++++++ lib/kunit/platform_driver.c | 207 +++++++++++++++++++++++++++++++ 4 files changed, 335 insertions(+) create mode 100644 include/kunit/platform_driver.h create mode 100644 lib/kunit/platform_driver-test.c create mode 100644 lib/kunit/platform_driver.c
diff --git a/include/kunit/platform_driver.h b/include/kunit/platform_driver.h new file mode 100644 index 000000000000..dc211ff8f893 --- /dev/null +++ b/include/kunit/platform_driver.h @@ -0,0 +1,15 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _KUNIT_PLATFORM_DRIVER_H +#define _KUNIT_PLATFORM_DRIVER_H + +struct kunit; +struct platform_device; +struct platform_driver; + +struct platform_device * +kunit_platform_device_alloc(struct kunit *test, const char *name, int id); +int kunit_platform_device_add(struct kunit *test, struct platform_device *pdev); + +int kunit_platform_driver_register(struct kunit *test, struct platform_driver *drv); + +#endif diff --git a/lib/kunit/Makefile b/lib/kunit/Makefile index 29aff6562b42..5964d8231ff5 100644 --- a/lib/kunit/Makefile +++ b/lib/kunit/Makefile @@ -1,5 +1,6 @@ obj-$(CONFIG_KUNIT) += kunit.o
+# Core KUnit code kunit-objs += test.o \ resource.o \ string-stream.o \ @@ -11,7 +12,12 @@ ifeq ($(CONFIG_KUNIT_DEBUGFS),y) kunit-objs += debugfs.o endif
+# KUnit helpers +kunit-objs += platform_driver.o + +# KUnit tests obj-$(CONFIG_KUNIT_TEST) += kunit-test.o +obj-$(CONFIG_KUNIT_TEST) += platform_driver-test.o
# string-stream-test compiles built-in only. ifeq ($(CONFIG_KUNIT_TEST),y) diff --git a/lib/kunit/platform_driver-test.c b/lib/kunit/platform_driver-test.c new file mode 100644 index 000000000000..c926fe01b40a --- /dev/null +++ b/lib/kunit/platform_driver-test.c @@ -0,0 +1,107 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * KUnit test for platform driver infrastructure. + */ + +#include <linux/platform_device.h> + +#include <kunit/platform_driver.h> +#include <kunit/test.h> + +/* + * Test that kunit_platform_device_alloc() creates a platform device. + */ +static void kunit_platform_device_alloc_test(struct kunit *test) +{ + KUNIT_EXPECT_NOT_ERR_OR_NULL(test, + kunit_platform_device_alloc(test, "kunit-platform", 1)); +} + +/* + * Test that kunit_platform_device_add() registers a platform device on the + * platform bus with the proper name and id. + */ +static void kunit_platform_device_add_test(struct kunit *test) +{ + struct platform_device *pdev; + const char *name = "kunit-platform"; + const int id = -1; + + pdev = kunit_platform_device_alloc(test, name, id); + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, pdev); + + KUNIT_EXPECT_EQ(test, 0, kunit_platform_device_add(test, pdev)); + KUNIT_EXPECT_TRUE(test, dev_is_platform(&pdev->dev)); + KUNIT_EXPECT_STREQ(test, pdev->name, name); + KUNIT_EXPECT_EQ(test, pdev->id, id); +} + +static struct kunit_case kunit_platform_device_test_cases[] = { + KUNIT_CASE(kunit_platform_device_alloc_test), + KUNIT_CASE(kunit_platform_device_add_test), + {} +}; + +static struct kunit_suite kunit_platform_device_suite = { + .name = "kunit_platform_device", + .test_cases = kunit_platform_device_test_cases, +}; + +struct kunit_platform_driver_test_context { + struct platform_driver pdrv; + const char *data; +}; + +static inline struct kunit_platform_driver_test_context * +to_test_context(struct platform_device *pdev) +{ + return container_of(to_platform_driver(pdev->dev.driver), + struct kunit_platform_driver_test_context, + pdrv); +} + +static int kunit_platform_driver_probe(struct platform_device *pdev) +{ + struct kunit_platform_driver_test_context *ctx; + + ctx = to_test_context(pdev); + ctx->data = "test data"; + + return 0; +} + +/* Test that kunit_platform_driver_register() registers a driver that probes. */ +static void kunit_platform_driver_register_test(struct kunit *test) +{ + struct platform_device *pdev; + struct kunit_platform_driver_test_context *ctx; + + ctx = kunit_kzalloc(test, sizeof(*ctx), GFP_KERNEL); + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ctx); + + pdev = kunit_platform_device_alloc(test, "kunit-platform", -1); + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, pdev); + KUNIT_ASSERT_EQ(test, 0, kunit_platform_device_add(test, pdev)); + + ctx->pdrv.probe = kunit_platform_driver_probe; + ctx->pdrv.driver.name = "kunit-platform"; + ctx->pdrv.driver.owner = THIS_MODULE; + + KUNIT_EXPECT_EQ(test, 0, kunit_platform_driver_register(test, &ctx->pdrv)); + KUNIT_EXPECT_STREQ(test, ctx->data, "test data"); +} + +static struct kunit_case kunit_platform_driver_test_cases[] = { + KUNIT_CASE(kunit_platform_driver_register_test), + {} +}; + +static struct kunit_suite kunit_platform_driver_suite = { + .name = "kunit_platform_driver", + .test_cases = kunit_platform_driver_test_cases, +}; + +kunit_test_suites(&kunit_platform_device_suite, + &kunit_platform_driver_suite); + +MODULE_LICENSE("GPL"); diff --git a/lib/kunit/platform_driver.c b/lib/kunit/platform_driver.c new file mode 100644 index 000000000000..11d155114936 --- /dev/null +++ b/lib/kunit/platform_driver.c @@ -0,0 +1,207 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Test managed platform driver + */ + +#include <linux/device/driver.h> +#include <linux/platform_device.h> + +#include <kunit/resource.h> + +struct kunit_platform_device_alloc_params { + const char *name; + int id; +}; + +static int kunit_platform_device_alloc_init(struct kunit_resource *res, void *context) +{ + struct kunit_platform_device_alloc_params *params = context; + struct platform_device *pdev; + + pdev = platform_device_alloc(params->name, params->id); + if (!pdev) + return -ENOMEM; + + res->data = pdev; + + return 0; +} + +static void kunit_platform_device_alloc_exit(struct kunit_resource *res) +{ + struct platform_device *pdev = res->data; + + platform_device_put(pdev); +} + +/** + * kunit_platform_device_alloc() - Allocate a KUnit test managed platform device + * @test: test context + * @dev: platform device to alloc + * + * Register a test managed platform device. The device is put when the test completes. + * + * Returns: 0 on success, negative errno on failure. + */ +struct platform_device * +kunit_platform_device_alloc(struct kunit *test, const char *name, int id) +{ + struct platform_device *pdev; + struct kunit_platform_device_alloc_params params = { + .name = name, + .id = id, + }; + + pdev = kunit_alloc_resource(test, + kunit_platform_device_alloc_init, + kunit_platform_device_alloc_exit, + GFP_KERNEL, ¶ms); + if (!pdev) + return ERR_PTR(-ENOMEM); + + return pdev; +} +EXPORT_SYMBOL_GPL(kunit_platform_device_alloc); + +static int kunit_platform_device_add_init(struct kunit_resource *res, void *context) +{ + struct platform_device *pdev = context; + int ret; + + ret = platform_device_add(pdev); + if (ret) { + platform_device_put(pdev); + return ret; + } + res->data = pdev; + + return 0; +} + +static void kunit_platform_device_add_exit(struct kunit_resource *res) +{ + struct platform_device *pdev = res->data; + + platform_device_unregister(pdev); +} + +/** + * kunit_platform_device_add() - Register a KUnit test managed platform device + * @test: test context + * @dev: platform device to add + * + * Register a test managed platform device. The device is unregistered when the + * test completes. + * + * Returns: 0 on success, negative errno on failure. + */ +int kunit_platform_device_add(struct kunit *test, struct platform_device *pdev) +{ + struct platform_device *res; + + res = kunit_alloc_resource(test, + kunit_platform_device_add_init, + kunit_platform_device_add_exit, + GFP_KERNEL, pdev); + if (!res) + return -EINVAL; + + return 0; +} +EXPORT_SYMBOL_GPL(kunit_platform_device_add); + +static int kunit_platform_driver_register_init(struct kunit_resource *res, void *context) +{ + struct platform_driver *drv = context; + int ret; + + ret = platform_driver_register(drv); + if (ret) + return ret; + res->data = drv; + + /* + * Wait for the driver to probe (or at least flush out of the deferred + * workqueue) + */ + wait_for_device_probe(); + + return 0; +} + +static void kunit_platform_driver_register_exit(struct kunit_resource *res) +{ + struct platform_driver *drv = res->data; + + platform_driver_unregister(drv); +} + +/** + * kunit_platform_driver_register() - Register a KUnit test managed platform driver + * @test: test context + * @drv: platform driver to register + * + * Register a test managed platform driver. This allows callers to embed the + * @drv in a container structure and use container_of() in the probe function + * to pass information to kunit tests. It can be assumed that the driver has + * probed when this function returns. + * + * Example: + * + * .. code-block:: c + * + * struct kunit_test_context { + * struct platform_driver pdrv; + * const char *data; + * }; + * + * static inline struct kunit_test_context * + * to_test_context(struct platform_device *pdev) + * { + * return container_of(to_platform_driver(pdev->dev.driver), + * struct kunit_test_context, + * pdrv); + * } + * + * static int kunit_platform_driver_probe(struct platform_device *pdev) + * { + * struct kunit_test_context *ctx; + * + * ctx = to_test_context(pdev); + * ctx->data = "test data"; + * + * return 0; + * } + * + * static void kunit_platform_driver_test(struct kunit *test) + * { + * struct kunit_test_context *ctx; + * + * ctx = kunit_kzalloc(test, sizeof(*ctx), GFP_KERNEL); + * KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ctx); + * + * ctx->pdrv.probe = kunit_platform_driver_probe; + * ctx->pdrv.driver.name = "kunit-platform"; + * ctx->pdrv.driver.owner = THIS_MODULE; + * + * KUNIT_EXPECT_EQ(test, 0, kunit_platform_driver_register(test, &ctx->pdrv)); + * KUNIT_EXPECT_STREQ(test, ctx->data, "test data"); + * } + * + * Returns: 0 on success, negative errno on failure. + */ +int kunit_platform_driver_register(struct kunit *test, + struct platform_driver *drv) +{ + struct platform_driver *res; + + res = kunit_alloc_resource(test, + kunit_platform_driver_register_init, + kunit_platform_driver_register_exit, + GFP_KERNEL, drv); + if (!res) + return -EINVAL; + + return 0; +} +EXPORT_SYMBOL_GPL(kunit_platform_driver_register);