Quelle  platform-device-test.c   Sprache: C

// SPDX-License-Identifier: GPL-2.0

#include <kunit/platform_device.h>
#include <kunit/resource.h>

#include <linux/device.h>
#include <linux/device/bus.h>
#include <linux/of_platform.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,
};

static void platform_device_find_by_null_test(struct kunit *test)
{
 struct platform_device *pdev;
 int ret;

 pdev = kunit_platform_device_alloc(test, DEVICE_NAME, PLATFORM_DEVID_NONE);
 KUNIT_ASSERT_NOT_ERR_OR_NULL(test, pdev);

 ret = kunit_platform_device_add(test, pdev);
 KUNIT_ASSERT_EQ(test, ret, 0);

 KUNIT_EXPECT_PTR_EQ(test, of_find_device_by_node(NULL), NULL);

 KUNIT_EXPECT_PTR_EQ(test, bus_find_device_by_of_node(&platform_bus_type, NULL), NULL);
 KUNIT_EXPECT_PTR_EQ(test, bus_find_device_by_fwnode(&platform_bus_type, NULL), NULL);
 KUNIT_EXPECT_PTR_EQ(test, bus_find_device_by_acpi_dev(&platform_bus_type, NULL), NULL);

 KUNIT_EXPECT_FALSE(test, device_match_of_node(&pdev->dev, NULL));
 KUNIT_EXPECT_FALSE(test, device_match_fwnode(&pdev->dev, NULL));
 KUNIT_EXPECT_FALSE(test, device_match_acpi_dev(&pdev->dev, NULL));
 KUNIT_EXPECT_FALSE(test, device_match_acpi_handle(&pdev->dev, NULL));
}

static struct kunit_case platform_device_match_tests[] = {
 KUNIT_CASE(platform_device_find_by_null_test),
 {}
};

static struct kunit_suite platform_device_match_test_suite = {
 .name = "platform-device-match",
 .test_cases = platform_device_match_tests,
};

kunit_test_suites(
 &platform_device_devm_test_suite,
 &platform_device_match_test_suite,
);

MODULE_DESCRIPTION("Test module for platform devices");
MODULE_AUTHOR("Maxime Ripard ");
MODULE_LICENSE("GPL");