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Date: Wed, 28 Jun 2023 11:49:22 +0200
From: Maxime Ripard <mripard@...nel.org>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
"Rafael J. Wysocki" <rafael@...nel.org>
Cc: Brendan Higgins <brendan.higgins@...ux.dev>,
David Gow <davidgow@...gle.com>,
linux-kselftest@...r.kernel.org, kunit-dev@...glegroups.com,
linux-kernel@...r.kernel.org, Maxime Ripard <mripard@...nel.org>
Subject: [PATCH v2 2/3] drivers: base: Add basic devm tests for platform
devices
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.
Signed-off-by: Maxime Ripard <maxime@...no.tech>
---
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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