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// SPDX-License-Identifier: GPL-2.0
#include <kunit/resource.h>
#include <linux/device.h>
#include <linux/platform_device.h>
#define DEVICE_NAME "test"
struct test_priv {
bool probe_done;
bool release_done;
wait_queue_head_t probe_wq;
wait_queue_head_t release_wq;
struct device *dev;
};
static int platform_device_devm_init(struct kunit *test)
{
struct test_priv *priv;
priv = kunit_kzalloc(test, sizeof(*priv), GFP_KERNEL);
KUNIT_ASSERT_NOT_ERR_OR_NULL(test, priv);
init_waitqueue_head(&priv->probe_wq);
init_waitqueue_head(&priv->release_wq);
test->priv = priv;
return 0;
}
static void devm_device_action(void *ptr)
{
struct test_priv *priv = ptr;
priv->release_done = true;
wake_up_interruptible(&priv->release_wq);
}
static void devm_put_device_action(void *ptr)
{
struct test_priv *priv = ptr;
put_device(priv->dev);
priv->release_done = true;
wake_up_interruptible(&priv->release_wq);
}
#define RELEASE_TIMEOUT_MS 100
/*
* Tests that a platform bus, non-probed device will run its
* device-managed actions when unregistered.
*/
static void platform_device_devm_register_unregister_test(struct kunit *test)
{
struct platform_device *pdev;
struct test_priv *priv = test->priv;
int ret;
pdev = platform_device_alloc(DEVICE_NAME, PLATFORM_DEVID_NONE);
KUNIT_ASSERT_NOT_ERR_OR_NULL(test, pdev);
ret = platform_device_add(pdev);
KUNIT_ASSERT_EQ(test, ret, 0);
priv->dev = &pdev->dev;
ret = devm_add_action_or_reset(priv->dev, devm_device_action, priv);
KUNIT_ASSERT_EQ(test, ret, 0);
platform_device_unregister(pdev);
ret = wait_event_interruptible_timeout(priv->release_wq, priv->release_done,
msecs_to_jiffies(RELEASE_TIMEOUT_MS));
KUNIT_EXPECT_GT(test, ret, 0);
}
/*
* Tests that a platform bus, non-probed device will run its
* device-managed actions when unregistered, even if someone still holds
* a reference to it.
*/
static void platform_device_devm_register_get_unregister_with_devm_test(struct kunit *test)
{
struct platform_device *pdev;
struct test_priv *priv = test->priv;
int ret;
pdev = platform_device_alloc(DEVICE_NAME, PLATFORM_DEVID_NONE);
KUNIT_ASSERT_NOT_ERR_OR_NULL(test, pdev);
ret = platform_device_add(pdev);
KUNIT_ASSERT_EQ(test, ret, 0);
priv->dev = &pdev->dev;
get_device(priv->dev);
ret = devm_add_action_or_reset(priv->dev, devm_put_device_action, priv);
KUNIT_ASSERT_EQ(test, ret, 0);
platform_device_unregister(pdev);
ret = wait_event_interruptible_timeout(priv->release_wq, priv->release_done,
msecs_to_jiffies(RELEASE_TIMEOUT_MS));
KUNIT_EXPECT_GT(test, ret, 0);
}
static int fake_probe(struct platform_device *pdev)
{
struct test_priv *priv = platform_get_drvdata(pdev);
priv->probe_done = true;
wake_up_interruptible(&priv->probe_wq);
return 0;
}
static struct platform_driver fake_driver = {
.probe = fake_probe,
.driver = {
.name = DEVICE_NAME,
},
};
/*
* Tests that a platform bus, probed device will run its device-managed
* actions when unregistered.
*/
static void probed_platform_device_devm_register_unregister_test(struct kunit *test)
{
struct platform_device *pdev;
struct test_priv *priv = test->priv;
int ret;
ret = platform_driver_register(&fake_driver);
KUNIT_ASSERT_EQ(test, ret, 0);
pdev = platform_device_alloc(DEVICE_NAME, PLATFORM_DEVID_NONE);
KUNIT_ASSERT_NOT_ERR_OR_NULL(test, pdev);
priv->dev = &pdev->dev;
platform_set_drvdata(pdev, priv);
ret = platform_device_add(pdev);
KUNIT_ASSERT_EQ(test, ret, 0);
ret = wait_event_interruptible_timeout(priv->probe_wq, priv->probe_done,
msecs_to_jiffies(RELEASE_TIMEOUT_MS));
KUNIT_ASSERT_GT(test, ret, 0);
ret = devm_add_action_or_reset(priv->dev, devm_device_action, priv);
KUNIT_ASSERT_EQ(test, ret, 0);
platform_device_unregister(pdev);
ret = wait_event_interruptible_timeout(priv->release_wq, priv->release_done,
msecs_to_jiffies(RELEASE_TIMEOUT_MS));
KUNIT_EXPECT_GT(test, ret, 0);
platform_driver_unregister(&fake_driver);
}
/*
* Tests that a platform bus, probed device will run its device-managed
* actions when unregistered, even if someone still holds a reference to
* it.
*/
static void probed_platform_device_devm_register_get_unregister_with_devm_test(struct kunit *test)
{
struct platform_device *pdev;
struct test_priv *priv = test->priv;
int ret;
ret = platform_driver_register(&fake_driver);
KUNIT_ASSERT_EQ(test, ret, 0);
pdev = platform_device_alloc(DEVICE_NAME, PLATFORM_DEVID_NONE);
KUNIT_ASSERT_NOT_ERR_OR_NULL(test, pdev);
priv->dev = &pdev->dev;
platform_set_drvdata(pdev, priv);
ret = platform_device_add(pdev);
KUNIT_ASSERT_EQ(test, ret, 0);
ret = wait_event_interruptible_timeout(priv->probe_wq, priv->probe_done,
msecs_to_jiffies(RELEASE_TIMEOUT_MS));
KUNIT_ASSERT_GT(test, ret, 0);
get_device(priv->dev);
ret = devm_add_action_or_reset(priv->dev, devm_put_device_action, priv);
KUNIT_ASSERT_EQ(test, ret, 0);
platform_device_unregister(pdev);
ret = wait_event_interruptible_timeout(priv->release_wq, priv->release_done,
msecs_to_jiffies(RELEASE_TIMEOUT_MS));
KUNIT_EXPECT_GT(test, ret, 0);
platform_driver_unregister(&fake_driver);
}
static struct kunit_case platform_device_devm_tests[] = {
KUNIT_CASE(platform_device_devm_register_unregister_test),
KUNIT_CASE(platform_device_devm_register_get_unregister_with_devm_test),
KUNIT_CASE(probed_platform_device_devm_register_unregister_test),
KUNIT_CASE(probed_platform_device_devm_register_get_unregister_with_devm_test),
{}
};
static struct kunit_suite platform_device_devm_test_suite = {
.name = "platform-device-devm",
.init = platform_device_devm_init,
.test_cases = platform_device_devm_tests,
};
kunit_test_suite(platform_device_devm_test_suite);
MODULE_DESCRIPTION("Test module for platform devices");
MODULE_AUTHOR("Maxime Ripard <mripard@kernel.org>");
MODULE_LICENSE("GPL");
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