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Signed-off-by: Bartosz Golaszewski --- include/kunit/platform_device.h | 4 ++++ lib/kunit/platform.c | 31 +++++++++++++++++++++++++++++++ 2 files changed, 35 insertions(+) diff --git a/include/kunit/platform_device.h b/include/kunit/platform_devic= e.h index f8236a8536f7ebcee6b0e00a7bd799a14b345c1b..8cad6e1c3e7efba862862b57908= 9f2f317784a73 100644 --- a/include/kunit/platform_device.h +++ b/include/kunit/platform_device.h @@ -6,10 +6,14 @@ struct completion; struct kunit; struct platform_device; struct platform_driver; +struct platform_device_info; =20 struct platform_device * kunit_platform_device_alloc(struct kunit *test, const char *name, int id); int kunit_platform_device_add(struct kunit *test, struct platform_device *= pdev); +struct platform_device * +kunit_platform_device_register_full(struct kunit *test, + const struct platform_device_info *pdevinfo); =20 int kunit_platform_device_prepare_wait_for_probe(struct kunit *test, struct platform_device *pdev, diff --git a/lib/kunit/platform.c b/lib/kunit/platform.c index 0b518de26065d65dac3bd49dd94a4b3e7ea0634b..583b50b538c79599ebbf33e261f= e2e9ced35efa9 100644 --- a/lib/kunit/platform.c +++ b/lib/kunit/platform.c @@ -6,6 +6,7 @@ #include #include #include +#include #include =20 #include @@ -130,6 +131,36 @@ int kunit_platform_device_add(struct kunit *test, stru= ct platform_device *pdev) } EXPORT_SYMBOL_GPL(kunit_platform_device_add); =20 +/** + * kunit_platform_device_register_full() - Register a KUnit test-managed p= latform + * device described by platform de= vice info + * @test: test context + * @pdevinfo: platform device information describing the new device + * + * Register a test-managed platform device. 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Using the regular platform_device_register() with kunit assertions may result in a platform device leak or otherwise requires cumbersome error handling. Provide a function that unregisters a kunit-managed platform device and drops the release action from the test's list. Signed-off-by: Bartosz Golaszewski --- include/kunit/platform_device.h | 2 ++ lib/kunit/platform.c | 15 +++++++++++++++ 2 files changed, 17 insertions(+) diff --git a/include/kunit/platform_device.h b/include/kunit/platform_devic= e.h index 8cad6e1c3e7efba862862b579089f2f317784a73..eee565d5d1d35c1d1bc82b45eb9= 1d21d00c68428 100644 --- a/include/kunit/platform_device.h +++ b/include/kunit/platform_device.h @@ -14,6 +14,8 @@ int kunit_platform_device_add(struct kunit *test, struct = platform_device *pdev); struct platform_device * kunit_platform_device_register_full(struct kunit *test, const struct platform_device_info *pdevinfo); +void kunit_platform_device_unregister(struct kunit *test, + struct platform_device *pdev); =20 int kunit_platform_device_prepare_wait_for_probe(struct kunit *test, struct platform_device *pdev, diff --git a/lib/kunit/platform.c b/lib/kunit/platform.c index 583b50b538c79599ebbf33e261fe2e9ced35efa9..ccfbc70b4e12817f60490e8146f= 7f7773c9a4dbb 100644 --- a/lib/kunit/platform.c +++ b/lib/kunit/platform.c @@ -161,6 +161,21 @@ kunit_platform_device_register_full(struct kunit *test, } EXPORT_SYMBOL_GPL(kunit_platform_device_register_full); 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The idea is to use it to test functionalities that can't easily be tested from user-space with kernel selftests or GPIO character device test suites provided by the libgpiod package. For now add test cases that verify software node based lookup and ensure that a GPIO provider unbinding with active consumers does not cause a crash. Signed-off-by: Bartosz Golaszewski --- drivers/gpio/Kconfig | 8 + drivers/gpio/Makefile | 1 + drivers/gpio/gpiolib-kunit.c | 358 +++++++++++++++++++++++++++++++++++++++= ++++ 3 files changed, 367 insertions(+) diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig index 00fcab5d09a4294ed778cea78af5867a0f6e481b..0306005fb7d65ae85905e967b90= 65fd74db753db 100644 --- a/drivers/gpio/Kconfig +++ b/drivers/gpio/Kconfig @@ -102,6 +102,14 @@ config GPIO_CDEV_V1 This ABI version is deprecated. Please use the latest ABI for new developments. =20 +config GPIO_KUNIT + tristate "Build GPIO Kunit test cases" + depends on KUNIT + default KUNIT_ALL_TESTS + help + Say Y here to build the module containing Kunit test cases verifying + the functionality of the GPIO subsystem. + config GPIO_GENERIC depends on HAS_IOMEM # Only for IOMEM drivers tristate diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile index 2ea47d9d3dca948e1cdc46965e83b0e1b6de5f70..c66b6dd659b16b80b6bb6b15fac= 3e3f462dec596 100644 --- a/drivers/gpio/Makefile +++ b/drivers/gpio/Makefile @@ -13,6 +13,7 @@ obj-$(CONFIG_GPIO_ACPI) +=3D gpiolib-acpi.o gpiolib-acpi-y :=3D gpiolib-acpi-core.o gpiolib-acpi-quirks.o obj-$(CONFIG_GPIOLIB) +=3D gpiolib-swnode.o obj-$(CONFIG_GPIO_SHARED) +=3D gpiolib-shared.o +obj-$(CONFIG_GPIO_KUNIT) +=3D gpiolib-kunit.o =20 # Device drivers. Generally keep list sorted alphabetically obj-$(CONFIG_GPIO_REGMAP) +=3D gpio-regmap.o diff --git a/drivers/gpio/gpiolib-kunit.c b/drivers/gpio/gpiolib-kunit.c new file mode 100644 index 0000000000000000000000000000000000000000..380b68f879e55433668353bb880= 67d561142a5bc --- /dev/null +++ b/drivers/gpio/gpiolib-kunit.c @@ -0,0 +1,358 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Copyright (C) Qualcomm Technologies, Inc. and/or its subsidiaries + */ + +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include + +#define GPIO_TEST_PROVIDER "gpio-test-provider" +#define GPIO_SWNODE_TEST_CONSUMER "gpio-swnode-test-consumer" +#define GPIO_UNBIND_TEST_CONSUMER "gpio-unbind-test-consumer" + +static int gpio_test_provider_get_direction(struct gpio_chip *gc, unsigned= int offset) +{ + return GPIO_LINE_DIRECTION_OUT; +} + +static int gpio_test_provider_set(struct gpio_chip *gc, unsigned int offse= t, int value) +{ + return 0; +} + +static int gpio_test_provider_probe(struct platform_device *pdev) +{ + struct device *dev =3D &pdev->dev; + struct gpio_chip *gc; + + gc =3D devm_kzalloc(dev, sizeof(*gc), GFP_KERNEL); + if (!gc) + return -ENOMEM; + + gc->base =3D -1; + gc->ngpio =3D 4; + gc->label =3D "gpio-swnode-consumer-test-device"; + gc->parent =3D dev; + gc->owner =3D THIS_MODULE; + + gc->get_direction =3D gpio_test_provider_get_direction; + gc->set =3D gpio_test_provider_set; + + return devm_gpiochip_add_data(dev, gc, NULL); +} + +static struct platform_driver gpio_test_provider_driver =3D { + .probe =3D gpio_test_provider_probe, + .driver =3D { + .name =3D GPIO_TEST_PROVIDER, + }, +}; + +static const struct software_node gpio_test_provider_swnode =3D { + .name =3D "gpio-test-provider-primary", +}; + +struct gpio_swnode_consumer_pdata { + bool gpio_ok; +}; + +static const struct gpio_swnode_consumer_pdata gpio_swnode_pdata_template = =3D { + .gpio_ok =3D false, +}; + +static int gpio_swnode_consumer_probe(struct platform_device *pdev) +{ + struct device *dev =3D &pdev->dev; + struct gpio_swnode_consumer_pdata *pdata =3D dev_get_platdata(dev); + struct gpio_desc *desc; + + desc =3D devm_gpiod_get(dev, "foo", GPIOD_OUT_HIGH); + if (IS_ERR(desc)) + return PTR_ERR(desc); + + pdata->gpio_ok =3D true; + + return 0; +} + +static struct platform_driver gpio_swnode_consumer_driver =3D { + .probe =3D gpio_swnode_consumer_probe, + .driver =3D { + .name =3D GPIO_SWNODE_TEST_CONSUMER, + }, +}; + +static void gpio_swnode_lookup_by_primary(struct kunit *test) +{ + struct gpio_swnode_consumer_pdata *pdata; + struct platform_device_info pdevinfo; + struct property_entry properties[2]; + struct platform_device *pdev; + bool bound =3D false; + int ret; + + ret =3D kunit_platform_driver_register(test, &gpio_test_provider_driver); + KUNIT_ASSERT_EQ(test, ret, 0); + + ret =3D kunit_platform_driver_register(test, &gpio_swnode_consumer_driver= ); + KUNIT_ASSERT_EQ(test, ret, 0); + + pdevinfo =3D (struct platform_device_info){ + .name =3D GPIO_TEST_PROVIDER, + .id =3D PLATFORM_DEVID_NONE, + .swnode =3D &gpio_test_provider_swnode, + }; + + pdev =3D kunit_platform_device_register_full(test, &pdevinfo); + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, pdev); + + properties[0] =3D PROPERTY_ENTRY_GPIO("foo-gpios", + &gpio_test_provider_swnode, + 0, GPIO_ACTIVE_HIGH); + properties[1] =3D (struct property_entry){ }; + + pdevinfo =3D (struct platform_device_info){ + .name =3D GPIO_SWNODE_TEST_CONSUMER, + .id =3D PLATFORM_DEVID_NONE, + .data =3D &gpio_swnode_pdata_template, + .size_data =3D sizeof(gpio_swnode_pdata_template), + .properties =3D properties, + }; + + pdev =3D kunit_platform_device_register_full(test, &pdevinfo); + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, pdev); + + wait_for_device_probe(); + scoped_guard(device, &pdev->dev) + bound =3D device_is_bound(&pdev->dev); + + KUNIT_ASSERT_TRUE(test, bound); + + pdata =3D dev_get_platdata(&pdev->dev); + KUNIT_ASSERT_TRUE(test, pdata->gpio_ok); +} + +static void gpio_swnode_lookup_by_secondary(struct kunit *test) +{ + struct gpio_swnode_consumer_pdata *pdata; + struct platform_device_info pdevinfo; + struct property_entry properties[2]; + struct fwnode_handle *primary; + struct platform_device *pdev; + bool bound =3D false; + int ret; + + /* + * Can't live on the stack as it will still get referenced in cleanup + * path after this function returns. + */ + primary =3D kunit_kzalloc(test, sizeof(*primary), GFP_KERNEL); + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, primary); + + ret =3D kunit_platform_driver_register(test, &gpio_test_provider_driver); + KUNIT_ASSERT_EQ(test, ret, 0); + + ret =3D kunit_platform_driver_register(test, &gpio_swnode_consumer_driver= ); + KUNIT_ASSERT_EQ(test, ret, 0); + + fwnode_init(primary, NULL); + + pdevinfo =3D (struct platform_device_info){ + .name =3D GPIO_TEST_PROVIDER, + .id =3D PLATFORM_DEVID_NONE, + .fwnode =3D primary, + .swnode =3D &gpio_test_provider_swnode, + }; + + pdev =3D kunit_platform_device_register_full(test, &pdevinfo); + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, pdev); + + properties[0] =3D PROPERTY_ENTRY_GPIO("foo-gpios", + &gpio_test_provider_swnode, + 0, GPIO_ACTIVE_HIGH); + properties[1] =3D (struct property_entry){ }; + + pdevinfo =3D (struct platform_device_info){ + .name =3D GPIO_SWNODE_TEST_CONSUMER, + .id =3D PLATFORM_DEVID_NONE, + .data =3D &gpio_swnode_pdata_template, + .size_data =3D sizeof(gpio_swnode_pdata_template), + .properties =3D properties, + }; + + pdev =3D kunit_platform_device_register_full(test, &pdevinfo); + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, pdev); + + wait_for_device_probe(); + scoped_guard(device, &pdev->dev) + bound =3D device_is_bound(&pdev->dev); + + KUNIT_ASSERT_TRUE(test, bound); + + pdata =3D dev_get_platdata(&pdev->dev); + KUNIT_ASSERT_TRUE(test, pdata->gpio_ok); +} + +static struct kunit_case gpio_swnode_lookup_tests[] =3D { + KUNIT_CASE(gpio_swnode_lookup_by_primary), + KUNIT_CASE(gpio_swnode_lookup_by_secondary), + { } +}; + +static struct kunit_suite gpio_swnode_lookup_test_suite =3D { + .name =3D "gpio-swnode-lookup", + .test_cases =3D gpio_swnode_lookup_tests, +}; + +static BLOCKING_NOTIFIER_HEAD(gpio_unbind_notifier); + +struct gpio_unbind_consumer_drvdata { + struct device *dev; + struct gpio_desc *desc; + struct notifier_block nb; + int set_retval; +}; + +static int gpio_unbind_notify(struct notifier_block *nb, unsigned long act= ion, + void *data) +{ + struct gpio_unbind_consumer_drvdata *drvdata =3D + container_of(nb, struct gpio_unbind_consumer_drvdata, nb); + struct device *dev =3D data; + + if (dev !=3D drvdata->dev) + return NOTIFY_DONE; + + drvdata->set_retval =3D gpiod_set_value_cansleep(drvdata->desc, 0); + + return NOTIFY_OK; +} + +static void gpio_unbind_unregister_notifier(void *data) +{ + struct notifier_block *nb =3D data; + + blocking_notifier_chain_unregister(&gpio_unbind_notifier, nb); +} + +static int gpio_unbind_consumer_probe(struct platform_device *pdev) +{ + struct gpio_unbind_consumer_drvdata *data; + struct device *dev =3D &pdev->dev; + int ret; + + data =3D devm_kzalloc(dev, sizeof(*data), GFP_KERNEL); + if (!data) + return -ENOMEM; + + data->dev =3D dev; + + data->desc =3D devm_gpiod_get(dev, "foo", GPIOD_OUT_HIGH); + if (IS_ERR(data->desc)) + return PTR_ERR(data->desc); + + data->nb.notifier_call =3D gpio_unbind_notify; + ret =3D blocking_notifier_chain_register(&gpio_unbind_notifier, &data->nb= ); + if (ret) + return ret; + + ret =3D devm_add_action_or_reset(dev, gpio_unbind_unregister_notifier, &d= ata->nb); + if (ret) + return ret; + + platform_set_drvdata(pdev, data); + + return 0; +} + +static struct platform_driver gpio_unbind_consumer_driver =3D { + .probe =3D gpio_unbind_consumer_probe, + .driver =3D { + .name =3D GPIO_UNBIND_TEST_CONSUMER, + }, +}; + +static void gpio_unbind_with_consumers(struct kunit *test) +{ + struct gpio_unbind_consumer_drvdata *cons_data; + struct platform_device_info pdevinfo; + struct property_entry properties[2]; + struct platform_device *prvd, *cons; + bool bound =3D false; + int ret; + + ret =3D kunit_platform_driver_register(test, &gpio_test_provider_driver); + KUNIT_ASSERT_EQ(test, ret, 0); + + ret =3D kunit_platform_driver_register(test, &gpio_unbind_consumer_driver= ); + KUNIT_ASSERT_EQ(test, ret, 0); + + pdevinfo =3D (struct platform_device_info){ + .name =3D GPIO_TEST_PROVIDER, + .id =3D PLATFORM_DEVID_NONE, + .swnode =3D &gpio_test_provider_swnode, + }; + + prvd =3D kunit_platform_device_register_full(test, &pdevinfo); + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, prvd); + + properties[0] =3D PROPERTY_ENTRY_GPIO("foo-gpios", + &gpio_test_provider_swnode, + 0, GPIO_ACTIVE_HIGH); + properties[1] =3D (struct property_entry){ }; + + pdevinfo =3D (struct platform_device_info){ + .name =3D GPIO_UNBIND_TEST_CONSUMER, + .id =3D PLATFORM_DEVID_NONE, + .properties =3D properties, + }; + + cons =3D kunit_platform_device_register_full(test, &pdevinfo); + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, cons); + + wait_for_device_probe(); + scoped_guard(device, &cons->dev) + bound =3D device_is_bound(&cons->dev); + + KUNIT_ASSERT_TRUE(test, bound); + + kunit_platform_device_unregister(test, prvd); + + ret =3D blocking_notifier_call_chain(&gpio_unbind_notifier, 0, &cons->dev= ); + KUNIT_ASSERT_EQ(test, ret, NOTIFY_OK); + + scoped_guard(device, &cons->dev) { + cons_data =3D platform_get_drvdata(cons); + ret =3D cons_data->set_retval; + } + + KUNIT_ASSERT_EQ(test, ret, -ENODEV); +} + +static struct kunit_case gpio_unbind_with_consumers_tests[] =3D { + KUNIT_CASE(gpio_unbind_with_consumers), + { } +}; + +static struct kunit_suite gpio_unbind_with_consumers_test_suite =3D { + .name =3D "gpio-unbind-with-consumers", + .test_cases =3D gpio_unbind_with_consumers_tests, +}; + +kunit_test_suites( + &gpio_swnode_lookup_test_suite, + &gpio_unbind_with_consumers_test_suite, +); + +MODULE_DESCRIPTION("Test module for the GPIO subsystem"); +MODULE_AUTHOR("Bartosz Golaszewski "= ); +MODULE_LICENSE("GPL"); --=20 2.47.3