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Date: Wed, 19 Jul 2023 17:13:50 +0800
From: David Gow <davidgow@...gle.com>
To: Maxime Ripard <mripard@...nel.org>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
"Rafael J. Wysocki" <rafael@...nel.org>,
Brendan Higgins <brendan.higgins@...ux.dev>,
linux-kselftest@...r.kernel.org, kunit-dev@...glegroups.com,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 2/3] drivers: base: Add basic devm tests for platform devices
On Wed, 28 Jun 2023 at 17:49, Maxime Ripard <mripard@...nel.org> wrote:
>
> Platform devices show some inconsistencies with how devm resources are
> released when the device has been probed and when it hasn't. Let's add a
> few tests to exercise thos paths and odd cases.
Nit: "these".
Also, it'd be nice to call out the case that fails explicitly in the
commit message here, so it's obvious what the "inconsistency" is.
>
> Signed-off-by: Maxime Ripard <maxime@...no.tech>
> ---
This looks good to me. I think this is, if anything, even more
obviously important than the root device issues, so we definitely need
to fix or document it.
Reviewed-by: David Gow <davidgow@...gle.com>
> drivers/base/test/Makefile | 1 +
> drivers/base/test/platform-device-test.c | 222 +++++++++++++++++++++++++++++++
> 2 files changed, 223 insertions(+)
>
> diff --git a/drivers/base/test/Makefile b/drivers/base/test/Makefile
> index d589ca3fa8fc..e321dfc7e922 100644
> --- a/drivers/base/test/Makefile
> +++ b/drivers/base/test/Makefile
> @@ -2,6 +2,7 @@
> obj-$(CONFIG_TEST_ASYNC_DRIVER_PROBE) += test_async_driver_probe.o
>
> obj-$(CONFIG_DM_KUNIT_TEST) += root-device-test.o
> +obj-$(CONFIG_DM_KUNIT_TEST) += platform-device-test.o
>
> obj-$(CONFIG_DRIVER_PE_KUNIT_TEST) += property-entry-test.o
> CFLAGS_property-entry-test.o += $(DISABLE_STRUCTLEAK_PLUGIN)
> diff --git a/drivers/base/test/platform-device-test.c b/drivers/base/test/platform-device-test.c
> new file mode 100644
> index 000000000000..b6ebf1dcdffb
> --- /dev/null
> +++ b/drivers/base/test/platform-device-test.c
> @@ -0,0 +1,222 @@
> +// 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;
> +
> + kunit_skip(test, "This needs to be fixed in the core.");
> +
> + 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);
>
> --
> 2.40.0
>
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