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// SPDX-License-Identifier: GPL-2.0
/*
* KUnit test for KUnit platform driver infrastructure.
*/
#include <linux/platform_device.h>
#include <kunit/platform_device.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-add";
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);
}
/*
* Test that kunit_platform_device_add() called twice with the same device name
* and id fails the second time and properly cleans up.
*/
static void kunit_platform_device_add_twice_fails_test(struct kunit *test)
{
struct platform_device *pdev;
const char *name = "kunit-platform-add-2";
const int id = -1;
pdev = kunit_platform_device_alloc(test, name, id);
KUNIT_ASSERT_NOT_ERR_OR_NULL(test, pdev);
KUNIT_ASSERT_EQ(test, 0, kunit_platform_device_add(test, pdev));
pdev = kunit_platform_device_alloc(test, name, id);
KUNIT_ASSERT_NOT_ERR_OR_NULL(test, pdev);
KUNIT_EXPECT_NE(test, 0, kunit_platform_device_add(test, pdev));
}
static int kunit_platform_device_find_by_name(struct device *dev, const void *data)
{
return strcmp(dev_name(dev), data) == 0;
}
/*
* Test that kunit_platform_device_add() cleans up by removing the platform
* device when the test finishes. */
static void kunit_platform_device_add_cleans_up(struct kunit *test)
{
struct platform_device *pdev;
const char *name = "kunit-platform-clean";
const int id = -1;
struct kunit fake;
struct device *dev;
kunit_init_test(&fake, "kunit_platform_device_add_fake_test", NULL);
KUNIT_ASSERT_EQ(test, fake.status, KUNIT_SUCCESS);
pdev = kunit_platform_device_alloc(&fake, name, id);
KUNIT_ASSERT_NOT_ERR_OR_NULL(test, pdev);
KUNIT_ASSERT_EQ(test, 0, kunit_platform_device_add(&fake, pdev));
dev = bus_find_device(&platform_bus_type, NULL, name,
kunit_platform_device_find_by_name);
KUNIT_ASSERT_NOT_ERR_OR_NULL(test, dev);
put_device(dev);
/* Remove pdev */
kunit_cleanup(&fake);
/*
* Failing to migrate the kunit_resource would lead to an extra
* put_device() call on the platform device. The best we can do here is
* make sure the device no longer exists on the bus, but if something
* is wrong we'll see a refcount underflow here. We can't test for a
* refcount underflow because the kref matches the lifetime of the
* device which should already be freed and could be used by something
* else.
*/
dev = bus_find_device(&platform_bus_type, NULL, name,
kunit_platform_device_find_by_name);
KUNIT_EXPECT_PTR_EQ(test, NULL, dev);
put_device(dev);
}
/*
* Test suite for struct platform_device kunit APIs
*/
static struct kunit_case kunit_platform_device_test_cases[] = {
KUNIT_CASE(kunit_platform_device_alloc_test),
KUNIT_CASE(kunit_platform_device_add_test),
KUNIT_CASE(kunit_platform_device_add_twice_fails_test),
KUNIT_CASE(kunit_platform_device_add_cleans_up),
{}
};
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 const char * const test_data = "test 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;
DECLARE_COMPLETION_ONSTACK(comp);
const char *name = "kunit-platform-register";
ctx = kunit_kzalloc(test, sizeof(*ctx), GFP_KERNEL);
KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ctx);
pdev = kunit_platform_device_alloc(test, name, -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 = name;
ctx->pdrv.driver.owner = THIS_MODULE;
KUNIT_ASSERT_EQ(test, 0, kunit_platform_device_prepare_wait_for_probe(test, pdev, &comp));
KUNIT_EXPECT_EQ(test, 0, kunit_platform_driver_register(test, &ctx->pdrv));
KUNIT_EXPECT_NE(test, 0, wait_for_completion_timeout(&comp, 3 * HZ));
KUNIT_EXPECT_STREQ(test, ctx->data, test_data);
}
/*
* Test that kunit_platform_device_prepare_wait_for_probe() completes the completion
* when the device is already probed.
*/
static void kunit_platform_device_prepare_wait_for_probe_completes_when_already_probed(struct kunit *test)
{
struct platform_device *pdev;
struct kunit_platform_driver_test_context *ctx;
DECLARE_COMPLETION_ONSTACK(comp);
const char *name = "kunit-platform-wait";
ctx = kunit_kzalloc(test, sizeof(*ctx), GFP_KERNEL);
KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ctx);
pdev = kunit_platform_device_alloc(test, name, -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 = name;
ctx->pdrv.driver.owner = THIS_MODULE;
/* Make sure driver has actually probed */
KUNIT_ASSERT_EQ(test, 0, kunit_platform_device_prepare_wait_for_probe(test, pdev, &comp));
KUNIT_ASSERT_EQ(test, 0, kunit_platform_driver_register(test, &ctx->pdrv));
KUNIT_ASSERT_NE(test, 0, wait_for_completion_timeout(&comp, 3 * HZ));
reinit_completion(&comp);
KUNIT_ASSERT_EQ(test, 0, kunit_platform_device_prepare_wait_for_probe(test, pdev, &comp));
KUNIT_EXPECT_NE(test, 0, wait_for_completion_timeout(&comp, HZ));
}
static struct kunit_case kunit_platform_driver_test_cases[] = {
KUNIT_CASE(kunit_platform_driver_register_test),
KUNIT_CASE(kunit_platform_device_prepare_wait_for_probe_completes_when_already_probed),
{}
};
/*
* Test suite for struct platform_driver kunit APIs
*/
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");
MODULE_DESCRIPTION("KUnit test for KUnit platform driver infrastructure");
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