Add test managed wrappers for of_overlay_apply() that automatically removes the overlay when the test is finished. This API is intended for use by KUnit tests that test code which relies on 'struct device_node's and of_*() APIs.

KUnit tests will call of_overlay_apply_kunit() to load an overlay that's been built into the kernel image. When the test is complete, the overlay will be removed.

This has a few benefits:

1) It keeps the tests hermetic because the overlay is removed when the test is complete. Tests won't even be aware that an overlay was loaded in another test.

2) The overlay code can live right next to the unit test that loads it. The overlay and the unit test can be compiled into one kernel module if desired.

3) We can test different device tree configurations by loading different overlays. The overlays can be written for a specific test, and there can be many of them loaded per-test without needing to jam all possible combinations into one DTB.

4) It also allows KUnit to test device tree dependent code on any architecture, not just UML. This allows KUnit tests to test architecture specific device tree code.

There are some potential pitfalls though. Test authors need to be careful to not overwrite properties in the live tree. The easiest way to do this is to add and remove nodes with a 'kunit-' prefix, almost guaranteeing that the same node won't be present in the tree loaded at boot.

Suggested-by: Rob Herring robh@kernel.org Cc: Rob Herring robh@kernel.org Cc: Saravana Kannan saravanak@google.com Signed-off-by: Stephen Boyd sboyd@kernel.org --- Documentation/dev-tools/kunit/api/index.rst | 11 +++ Documentation/dev-tools/kunit/api/of.rst | 13 +++ drivers/of/Makefile | 1 + drivers/of/of_kunit.c | 99 +++++++++++++++++++++ include/kunit/of.h | 94 +++++++++++++++++++ 5 files changed, 218 insertions(+) create mode 100644 Documentation/dev-tools/kunit/api/of.rst create mode 100644 drivers/of/of_kunit.c create mode 100644 include/kunit/of.h

diff --git a/Documentation/dev-tools/kunit/api/index.rst b/Documentation/dev-tools/kunit/api/index.rst index 2d8f756aab56..282befa17edf 100644 --- a/Documentation/dev-tools/kunit/api/index.rst +++ b/Documentation/dev-tools/kunit/api/index.rst @@ -9,11 +9,15 @@ API Reference test resource functionredirection + of

This page documents the KUnit kernel testing API. It is divided into the following sections:

+Core KUnit API +============== + Documentation/dev-tools/kunit/api/test.rst

- Documents all of the standard testing API @@ -25,3 +29,10 @@ Documentation/dev-tools/kunit/api/resource.rst Documentation/dev-tools/kunit/api/functionredirection.rst

- Documents the KUnit Function Redirection API + +Driver KUnit API +================ + +Documentation/dev-tools/kunit/api/of.rst + + - Documents the KUnit device tree (OF) API diff --git a/Documentation/dev-tools/kunit/api/of.rst b/Documentation/dev-tools/kunit/api/of.rst new file mode 100644 index 000000000000..8587591c3e78 --- /dev/null +++ b/Documentation/dev-tools/kunit/api/of.rst @@ -0,0 +1,13 @@ +.. SPDX-License-Identifier: GPL-2.0 + +==================== +Device Tree (OF) API +==================== + +The KUnit device tree API is used to test device tree (of_*) dependent code. + +.. kernel-doc:: include/kunit/of.h + :internal: + +.. kernel-doc:: drivers/of/of_kunit.c + :export: diff --git a/drivers/of/Makefile b/drivers/of/Makefile index 251d33532148..0dfd05079313 100644 --- a/drivers/of/Makefile +++ b/drivers/of/Makefile @@ -19,6 +19,7 @@ obj-y += kexec.o endif endif

+obj-$(CONFIG_KUNIT) += of_kunit.o obj-$(CONFIG_OF_KUNIT_TEST) += of_test.o

obj-$(CONFIG_OF_UNITTEST) += unittest-data/ diff --git a/drivers/of/of_kunit.c b/drivers/of/of_kunit.c new file mode 100644 index 000000000000..f63527268a51 --- /dev/null +++ b/drivers/of/of_kunit.c @@ -0,0 +1,99 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Test managed device tree APIs + */ + +#include <linux/of.h> +#include <linux/of_fdt.h> + +#include <kunit/of.h> +#include <kunit/test.h> +#include <kunit/resource.h> + +static void of_overlay_fdt_apply_kunit_exit(void *ovcs_id) +{ + of_overlay_remove(ovcs_id); +} + +/** + * of_overlay_fdt_apply_kunit() - Test managed of_overlay_fdt_apply() + * @test: test context + * @overlay_fdt: device tree overlay to apply + * @overlay_fdt_size: size in bytes of @overlay_fdt + * @ovcs_id: identifier of overlay, used to remove the overlay + * + * Just like of_overlay_fdt_apply(), except the overlay is managed by the test + * case and is automatically removed with of_overlay_remove() after the test + * case concludes. + * + * Return: 0 on success, negative errno on failure + */ +int of_overlay_fdt_apply_kunit(struct kunit *test, void *overlay_fdt, + u32 overlay_fdt_size, int *ovcs_id) +{ + int ret; + int *copy_id; + + if (!IS_ENABLED(CONFIG_OF_OVERLAY)) + kunit_skip(test, "requires CONFIG_OF_OVERLAY"); + if (!IS_ENABLED(CONFIG_OF_EARLY_FLATTREE)) + kunit_skip(test, "requires CONFIG_OF_EARLY_FLATTREE for root node"); + + copy_id = kunit_kmalloc(test, sizeof(*copy_id), GFP_KERNEL); + if (!copy_id) + return -ENOMEM; + + ret = of_overlay_fdt_apply(overlay_fdt, overlay_fdt_size, + ovcs_id, NULL); + if (ret) + return ret; + + *copy_id = *ovcs_id; + + return kunit_add_action_or_reset(test, of_overlay_fdt_apply_kunit_exit, + copy_id); +} +EXPORT_SYMBOL_GPL(of_overlay_fdt_apply_kunit); + +/** + * __of_overlay_apply_kunit() - Test managed of_overlay_fdt_apply() variant + * @test: test context + * @overlay_begin: start address of overlay to apply + * @overlay_end: end address of overlay to apply + * + * This is mostly internal API. See of_overlay_apply_kunit() for the wrapper + * that makes this easier to use. + * + * Similar to of_overlay_fdt_apply(), except the overlay is managed by the test + * case and is automatically removed with of_overlay_remove() after the test + * case concludes. + * + * Return: 0 on success, negative errno on failure + */ +int __of_overlay_apply_kunit(struct kunit *test, u8 *overlay_begin, + const u8 *overlay_end) +{ + int unused; + + return of_overlay_fdt_apply_kunit(test, overlay_begin, + overlay_end - overlay_begin, + &unused); +} +EXPORT_SYMBOL_GPL(__of_overlay_apply_kunit); + +/** + * of_node_put_kunit() - Test managed of_node_put() + * @test: test context + * @node: node to pass to `of_node_put()` + * + * Just like of_node_put(), except the node is managed by the test case and is + * automatically put with of_node_put() after the test case concludes. + */ +void of_node_put_kunit(struct kunit *test, struct device_node *node) +{ + if (kunit_add_action(test, (kunit_action_t *)&of_node_put, node)) { + KUNIT_FAIL(test, + "Can't allocate a kunit resource to put of_node\n"); + } +} +EXPORT_SYMBOL_GPL(of_node_put_kunit); diff --git a/include/kunit/of.h b/include/kunit/of.h new file mode 100644 index 000000000000..9981442ba578 --- /dev/null +++ b/include/kunit/of.h @@ -0,0 +1,94 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _KUNIT_OF_H +#define _KUNIT_OF_H + +#include <kunit/test.h> + +struct device_node; + +#ifdef CONFIG_OF + +int of_overlay_fdt_apply_kunit(struct kunit *test, void *overlay_fdt, + u32 overlay_fdt_size, int *ovcs_id); +int __of_overlay_apply_kunit(struct kunit *test, u8 *overlay_begin, + const u8 *overlay_end); + +void of_node_put_kunit(struct kunit *test, struct device_node *node); + +#else + +static inline int +of_overlay_fdt_apply_kunit(struct kunit *test, void *overlay_fdt, + u32 overlay_fdt_size, int *ovcs_id) +{ + kunit_skip(test, "requires CONFIG_OF"); + return -EINVAL; +} + +static inline int +__of_overlay_apply_kunit(struct kunit *test, u8 *overlay_begin, + const u8 *overlay_end) +{ + kunit_skip(test, "requires CONFIG_OF"); + return -EINVAL; +} + +static inline +void of_node_put_kunit(struct kunit *test, struct device_node *node) +{ + kunit_skip(test, "requires CONFIG_OF"); +} + +#endif /* !CONFIG_OF */ + +/** + * of_overlay_apply_kunit() - Test managed of_overlay_fdt_apply() for built-in overlays + * @test: test context + * @overlay_name: name of overlay to apply + * + * This macro is used to apply a device tree overlay built with the + * cmd_dt_S_dtbo rule in scripts/Makefile.lib that has been compiled into the + * kernel image or KUnit test module. The overlay is automatically removed when + * the test is finished. + * + * Unit tests that need device tree nodes should compile an overlay file with + * @overlay_name.dtbo.o in their Makefile along with their unit test and then + * load the overlay during their test. The @overlay_name matches the filename + * of the overlay without the dtbo filename extension. If CONFIG_OF_OVERLAY is + * not enabled, the @test will be skipped. + * + * In the Makefile + * + * .. code-block:: none + * + * obj-$(CONFIG_OF_OVERLAY_KUNIT_TEST) += overlay_test.o kunit_overlay_test.dtbo.o + * + * In the test + * + * .. code-block:: c + * + * static void of_overlay_kunit_of_overlay_apply(struct kunit *test) + * { + * struct device_node *np; + * + * KUNIT_ASSERT_EQ(test, 0, + * of_overlay_apply_kunit(test, kunit_overlay_test)); + * + * np = of_find_node_by_name(NULL, "test-kunit"); + * KUNIT_EXPECT_NOT_ERR_OR_NULL(test, np); + * of_node_put(np); + * } + * + * Return: 0 on success, negative errno on failure. + */ +#define of_overlay_apply_kunit(test, overlay_name) \ +({ \ + extern uint8_t __dtbo_##overlay_name##_begin[]; \ + extern uint8_t __dtbo_##overlay_name##_end[]; \ + \ + __of_overlay_apply_kunit((test), \ + __dtbo_##overlay_name##_begin, \ + __dtbo_##overlay_name##_end); \ +}) + +#endif

Test the KUnit test managed overlay APIs. Confirm that platform devices are created and destroyed properly. This provides us confidence that the test managed APIs work correctly and can be relied upon to provide tests with fake platform devices and device nodes via overlays compiled into the kernel image.

Cc: Rob Herring robh@kernel.org Cc: Saravana Kannan saravanak@google.com Cc: Daniel Latypov dlatypov@google.com Cc: Brendan Higgins brendan.higgins@linux.dev Cc: David Gow davidgow@google.com Cc: Rae Moar rmoar@google.com Signed-off-by: Stephen Boyd sboyd@kernel.org --- drivers/of/.kunitconfig | 1 + drivers/of/Kconfig | 10 +++ drivers/of/Makefile | 1 + drivers/of/kunit_overlay_test.dtso | 9 +++ drivers/of/overlay_test.c | 115 +++++++++++++++++++++++++++++ 5 files changed, 136 insertions(+) create mode 100644 drivers/of/kunit_overlay_test.dtso create mode 100644 drivers/of/overlay_test.c

diff --git a/drivers/of/.kunitconfig b/drivers/of/.kunitconfig index 5a8fee11978c..4c53d2c7a275 100644 --- a/drivers/of/.kunitconfig +++ b/drivers/of/.kunitconfig @@ -1,3 +1,4 @@ CONFIG_KUNIT=y CONFIG_OF=y CONFIG_OF_KUNIT_TEST=y +CONFIG_OF_OVERLAY_KUNIT_TEST=y diff --git a/drivers/of/Kconfig b/drivers/of/Kconfig index dd726c7056bf..0e2d608c3e20 100644 --- a/drivers/of/Kconfig +++ b/drivers/of/Kconfig @@ -107,6 +107,16 @@ config OF_OVERLAY While this option is selected automatically when needed, you can enable it manually to improve device tree unit test coverage.

+config OF_OVERLAY_KUNIT_TEST + tristate "Device Tree overlay KUnit tests" if !KUNIT_ALL_TESTS + depends on KUNIT + default KUNIT_ALL_TESTS + select OF_OVERLAY + help + This option builds KUnit unit tests for the device tree overlay code. + + If unsure, say N here, but this option is safe to enable. + config OF_NUMA bool

diff --git a/drivers/of/Makefile b/drivers/of/Makefile index 0dfd05079313..88588ffb9de6 100644 --- a/drivers/of/Makefile +++ b/drivers/of/Makefile @@ -21,5 +21,6 @@ endif

obj-$(CONFIG_KUNIT) += of_kunit.o obj-$(CONFIG_OF_KUNIT_TEST) += of_test.o +obj-$(CONFIG_OF_OVERLAY_KUNIT_TEST) += overlay_test.o kunit_overlay_test.dtbo.o

obj-$(CONFIG_OF_UNITTEST) += unittest-data/ diff --git a/drivers/of/kunit_overlay_test.dtso b/drivers/of/kunit_overlay_test.dtso new file mode 100644 index 000000000000..85f20b4b4c16 --- /dev/null +++ b/drivers/of/kunit_overlay_test.dtso @@ -0,0 +1,9 @@ +// SPDX-License-Identifier: GPL-2.0 +/dts-v1/; +/plugin/; + +&{/} { + kunit-test { + compatible = "test,empty"; + }; +}; diff --git a/drivers/of/overlay_test.c b/drivers/of/overlay_test.c new file mode 100644 index 000000000000..223e5a5c23c5 --- /dev/null +++ b/drivers/of/overlay_test.c @@ -0,0 +1,115 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * KUnit tests for device tree overlays + */ +#include <linux/device/bus.h> +#include <linux/kconfig.h> +#include <linux/of.h> +#include <linux/of_platform.h> +#include <linux/platform_device.h> + +#include <kunit/of.h> +#include <kunit/test.h> + +static const char * const kunit_node_name = "kunit-test"; +static const char * const kunit_compatible = "test,empty"; + +/* Test that of_overlay_apply_kunit() adds a node to the live tree */ +static void of_overlay_apply_kunit_apply(struct kunit *test) +{ + struct device_node *np; + + KUNIT_ASSERT_EQ(test, 0, + of_overlay_apply_kunit(test, kunit_overlay_test)); + + np = of_find_node_by_name(NULL, kunit_node_name); + KUNIT_EXPECT_NOT_ERR_OR_NULL(test, np); + of_node_put(np); +} + +/* + * Test that of_overlay_apply_kunit() creates platform devices with the + * expected device_node + */ +static void of_overlay_apply_kunit_platform_device(struct kunit *test) +{ + struct platform_device *pdev; + struct device_node *np; + + KUNIT_ASSERT_EQ(test, 0, + of_overlay_apply_kunit(test, kunit_overlay_test)); + + np = of_find_node_by_name(NULL, kunit_node_name); + of_node_put_kunit(test, np); + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, np); + + pdev = of_find_device_by_node(np); + KUNIT_EXPECT_NOT_ERR_OR_NULL(test, pdev); + put_device(&pdev->dev); +} + +static int of_overlay_bus_match_compatible(struct device *dev, const void *data) +{ + return of_device_is_compatible(dev->of_node, data); +} + +/* Test that of_overlay_apply_kunit() cleans up after the test is finished */ +static void of_overlay_apply_kunit_cleanup(struct kunit *test) +{ + struct kunit fake; + struct platform_device *pdev; + struct device *dev; + struct device_node *np; + + if (!IS_ENABLED(CONFIG_OF_OVERLAY)) + kunit_skip(test, "requires CONFIG_OF_OVERLAY"); + if (!IS_ENABLED(CONFIG_OF_EARLY_FLATTREE)) + kunit_skip(test, "requires CONFIG_OF_EARLY_FLATTREE for root node"); + + kunit_init_test(&fake, "fake test", NULL); + KUNIT_ASSERT_EQ(test, fake.status, KUNIT_SUCCESS); + + KUNIT_ASSERT_EQ(test, 0, + of_overlay_apply_kunit(&fake, kunit_overlay_test)); + + np = of_find_node_by_name(NULL, kunit_node_name); + of_node_put(np); /* Not derefing 'np' after this */ + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, np); + + pdev = of_find_device_by_node(np); + put_device(&pdev->dev); /* Not derefing 'pdev' after this */ + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, pdev); + + /* Remove overlay */ + kunit_cleanup(&fake); + + /* The node and device should be removed */ + np = of_find_node_by_name(NULL, kunit_node_name); + KUNIT_EXPECT_PTR_EQ(test, NULL, np); + of_node_put(np); + + dev = bus_find_device(&platform_bus_type, NULL, kunit_compatible, + of_overlay_bus_match_compatible); + KUNIT_EXPECT_PTR_EQ(test, NULL, dev); + put_device(dev); +} + +static struct kunit_case of_overlay_apply_kunit_test_cases[] = { + KUNIT_CASE(of_overlay_apply_kunit_apply), + KUNIT_CASE(of_overlay_apply_kunit_platform_device), + KUNIT_CASE(of_overlay_apply_kunit_cleanup), + {} +}; + +/* + * Test suite for test managed device tree overlays. + */ +static struct kunit_suite of_overlay_apply_kunit_suite = { + .name = "of_overlay_apply_kunit", + .test_cases = of_overlay_apply_kunit_test_cases, +}; + +kunit_test_suites( + &of_overlay_apply_kunit_suite, +); +MODULE_LICENSE("GPL");

Introduce KUnit resource wrappers around platform_driver_register(), platform_device_alloc(), and platform_device_add() so that test authors can register platform drivers/devices from their tests and have the drivers/devices automatically be unregistered when the test is done.

This makes test setup code simpler when a platform driver or platform device is needed. Add a few test cases at the same time to make sure the APIs work as intended.

Cc: Brendan Higgins brendan.higgins@linux.dev Cc: David Gow davidgow@google.com Cc: Rae Moar rmoar@google.com Cc: Greg Kroah-Hartman gregkh@linuxfoundation.org Cc: "Rafael J. Wysocki" rafael@kernel.org Signed-off-by: Stephen Boyd sboyd@kernel.org --- Documentation/dev-tools/kunit/api/index.rst | 5 + .../dev-tools/kunit/api/platformdevice.rst | 10 + drivers/base/test/Makefile | 3 + drivers/base/test/platform_kunit-test.c | 140 ++++++++++++++ drivers/base/test/platform_kunit.c | 174 ++++++++++++++++++ include/kunit/platform_device.h | 15 ++ 6 files changed, 347 insertions(+) create mode 100644 Documentation/dev-tools/kunit/api/platformdevice.rst create mode 100644 drivers/base/test/platform_kunit-test.c create mode 100644 drivers/base/test/platform_kunit.c create mode 100644 include/kunit/platform_device.h

diff --git a/Documentation/dev-tools/kunit/api/index.rst b/Documentation/dev-tools/kunit/api/index.rst index 282befa17edf..02b26f5e8750 100644 --- a/Documentation/dev-tools/kunit/api/index.rst +++ b/Documentation/dev-tools/kunit/api/index.rst @@ -10,6 +10,7 @@ API Reference resource functionredirection of + platformdevice

This page documents the KUnit kernel testing API. It is divided into the @@ -36,3 +37,7 @@ Driver KUnit API Documentation/dev-tools/kunit/api/of.rst

- Documents the KUnit device tree (OF) API + +Documentation/dev-tools/kunit/api/platformdevice.rst + + - Documents the KUnit platform device API diff --git a/Documentation/dev-tools/kunit/api/platformdevice.rst b/Documentation/dev-tools/kunit/api/platformdevice.rst new file mode 100644 index 000000000000..b228fb6558c2 --- /dev/null +++ b/Documentation/dev-tools/kunit/api/platformdevice.rst @@ -0,0 +1,10 @@ +.. SPDX-License-Identifier: GPL-2.0 + +=================== +Platform Device API +=================== + +The KUnit platform device API is used to test platform devices. + +.. kernel-doc:: drivers/base/test/platform_kunit.c + :export: diff --git a/drivers/base/test/Makefile b/drivers/base/test/Makefile index e321dfc7e922..740aef267fbe 100644 --- a/drivers/base/test/Makefile +++ b/drivers/base/test/Makefile @@ -1,8 +1,11 @@ # SPDX-License-Identifier: GPL-2.0 obj-$(CONFIG_TEST_ASYNC_DRIVER_PROBE) += test_async_driver_probe.o

+obj-$(CONFIG_KUNIT) += platform_kunit.o + obj-$(CONFIG_DM_KUNIT_TEST) += root-device-test.o obj-$(CONFIG_DM_KUNIT_TEST) += platform-device-test.o +obj-$(CONFIG_DM_KUNIT_TEST) += platform_kunit-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_kunit-test.c b/drivers/base/test/platform_kunit-test.c new file mode 100644 index 000000000000..ce545532d209 --- /dev/null +++ b/drivers/base/test/platform_kunit-test.c @@ -0,0 +1,140 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * KUnit test for platform driver infrastructure. + */ + +#include <linux/platform_device.h> + +#include <kunit/platform_device.h> +#include <kunit/test.h> + +static const char * const kunit_devname = "kunit-platform"; + +/* + * Test that platform_device_alloc_kunit() creates a platform device. + */ +static void platform_device_alloc_kunit_test(struct kunit *test) +{ + KUNIT_EXPECT_NOT_ERR_OR_NULL(test, + platform_device_alloc_kunit(test, kunit_devname, 1)); +} + +/* + * Test that platform_device_add_kunit() registers a platform device on the + * platform bus with the proper name and id. + */ +static void platform_device_add_kunit_test(struct kunit *test) +{ + struct platform_device *pdev; + const char *name = kunit_devname; + const int id = -1; + + pdev = platform_device_alloc_kunit(test, name, id); + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, pdev); + + KUNIT_EXPECT_EQ(test, 0, platform_device_add_kunit(test, pdev)); + KUNIT_EXPECT_TRUE(test, dev_is_platform(&pdev->dev)); + KUNIT_EXPECT_STREQ(test, pdev->name, name); + KUNIT_EXPECT_EQ(test, pdev->id, id); +} + +/* + * Test that platform_device_add_kunit() called twice with the same device name + * and id fails the second time and properly cleans up. + */ +static void platform_device_add_kunit_twice_fails_test(struct kunit *test) +{ + struct platform_device *pdev; + const char *name = kunit_devname; + const int id = -1; + + pdev = platform_device_alloc_kunit(test, name, id); + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, pdev); + KUNIT_ASSERT_EQ(test, 0, platform_device_add_kunit(test, pdev)); + + pdev = platform_device_alloc_kunit(test, name, id); + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, pdev); + + KUNIT_EXPECT_NE(test, 0, platform_device_add_kunit(test, pdev)); +} + +/* + * Test suite for struct platform_device kunit APIs + */ +static struct kunit_case platform_device_kunit_test_cases[] = { + KUNIT_CASE(platform_device_alloc_kunit_test), + KUNIT_CASE(platform_device_add_kunit_test), + KUNIT_CASE(platform_device_add_kunit_twice_fails_test), + {} +}; + +static struct kunit_suite platform_device_kunit_suite = { + .name = "platform_device_kunit", + .test_cases = platform_device_kunit_test_cases, +}; + +struct kunit_platform_driver_test_context { + struct platform_driver pdrv; + const char *data; +}; + +static const char * const test_data = "test data"; + +static inline struct kunit_platform_driver_test_context * +to_test_context(struct platform_device *pdev) +{ + return container_of(to_platform_driver(pdev->dev.driver), + struct kunit_platform_driver_test_context, + pdrv); +} + +static int kunit_platform_driver_probe(struct platform_device *pdev) +{ + struct kunit_platform_driver_test_context *ctx; + + ctx = to_test_context(pdev); + ctx->data = test_data; + + return 0; +} + +/* Test that platform_driver_register_kunit() registers a driver that probes. */ +static void platform_driver_register_kunit_test(struct kunit *test) +{ + struct platform_device *pdev; + struct kunit_platform_driver_test_context *ctx; + + ctx = kunit_kzalloc(test, sizeof(*ctx), GFP_KERNEL); + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ctx); + + pdev = platform_device_alloc_kunit(test, kunit_devname, -1); + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, pdev); + KUNIT_ASSERT_EQ(test, 0, platform_device_add_kunit(test, pdev)); + + ctx->pdrv.probe = kunit_platform_driver_probe; + ctx->pdrv.driver.name = kunit_devname; + ctx->pdrv.driver.owner = THIS_MODULE; + + KUNIT_EXPECT_EQ(test, 0, platform_driver_register_kunit(test, &ctx->pdrv)); + KUNIT_EXPECT_STREQ(test, ctx->data, test_data); +} + +static struct kunit_case platform_driver_kunit_test_cases[] = { + KUNIT_CASE(platform_driver_register_kunit_test), + {} +}; + +/* + * Test suite for struct platform_driver kunit APIs + */ +static struct kunit_suite platform_driver_kunit_suite = { + .name = "platform_driver_kunit", + .test_cases = platform_driver_kunit_test_cases, +}; + +kunit_test_suites( + &platform_device_kunit_suite, + &platform_driver_kunit_suite, +); + +MODULE_LICENSE("GPL"); diff --git a/drivers/base/test/platform_kunit.c b/drivers/base/test/platform_kunit.c new file mode 100644 index 000000000000..54af6db2a6d8 --- /dev/null +++ b/drivers/base/test/platform_kunit.c @@ -0,0 +1,174 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Test managed platform driver + */ + +#include <linux/device/driver.h> +#include <linux/platform_device.h> + +#include <kunit/platform_device.h> +#include <kunit/resource.h> + +/** + * platform_device_alloc_kunit() - Allocate a KUnit test managed platform device + * @test: test context + * @name: device name of platform device to alloc + * @id: identifier of platform device to alloc. + * + * Allocate a test managed platform device. The device is put when the test completes. + * + * Return: Allocated platform device on success, NULL on failure. + */ +struct platform_device * +platform_device_alloc_kunit(struct kunit *test, const char *name, int id) +{ + struct platform_device *pdev; + + pdev = platform_device_alloc(name, id); + if (!pdev) + return NULL; + + if (kunit_add_action_or_reset(test, (kunit_action_t *)&platform_device_put, pdev)) + return NULL; + + return pdev; +} +EXPORT_SYMBOL_GPL(platform_device_alloc_kunit); + +static void platform_device_add_kunit_exit(struct kunit_resource *res) +{ + struct platform_device *pdev = res->data; + + platform_device_unregister(pdev); +} + +static bool +platform_device_alloc_kunit_match(struct kunit *test, + struct kunit_resource *res, void *match_data) +{ + struct platform_device *pdev = match_data; + + return res->data == pdev; +} + +/** + * platform_device_add_kunit() - Register a KUnit test managed platform device + * @test: test context + * @pdev: platform device to add + * + * Register a test managed platform device. The device is unregistered when the + * test completes. + * + * Return: 0 on success, negative errno on failure. + */ +int platform_device_add_kunit(struct kunit *test, struct platform_device *pdev) +{ + struct kunit_resource *res; + int ret; + + ret = platform_device_add(pdev); + if (ret) + return ret; + + res = kunit_find_resource(test, platform_device_alloc_kunit_match, pdev); + if (res) { + /* + * Transfer the reference count of the platform device if it was + * allocated with platform_device_alloc_kunit(). In that case, + * calling platform_device_put() leads to reference count + * underflow because platform_device_unregister() does it for + * us and we call platform_device_unregister() from + * platform_device_add_kunit_exit(). + * + * Usually callers transfer the refcount from + * platform_device_alloc() to platform_device_add() and simply + * call platform_device_unregister() when done, but with kunit + * we have to keep this straight by redirecting the free + * routine for the resource. + */ + res->free = platform_device_add_kunit_exit; + kunit_put_resource(res); + } else if (kunit_add_action_or_reset(test, + (kunit_action_t *)&platform_device_unregister, + pdev)) { + return -ENOMEM; + } + + return 0; +} +EXPORT_SYMBOL_GPL(platform_device_add_kunit); + +/** + * platform_driver_register_kunit() - Register a KUnit test managed platform driver + * @test: test context + * @drv: platform driver to register + * + * Register a test managed platform driver. This allows callers to embed the + * @drv in a container structure and use container_of() in the probe function + * to pass information to KUnit tests. It can be assumed that the driver has + * probed when this function returns. + * + * Example + * + * .. code-block:: c + * + * struct kunit_test_context { + * struct platform_driver pdrv; + * const char *data; + * }; + * + * static inline struct kunit_test_context * + * to_test_context(struct platform_device *pdev) + * { + * return container_of(to_platform_driver(pdev->dev.driver), + * struct kunit_test_context, + * pdrv); + * } + * + * static int kunit_platform_driver_probe(struct platform_device *pdev) + * { + * struct kunit_test_context *ctx; + * + * ctx = to_test_context(pdev); + * ctx->data = "test data"; + * + * return 0; + * } + * + * static void kunit_platform_driver_test(struct kunit *test) + * { + * struct kunit_test_context *ctx; + * + * ctx = kunit_kzalloc(test, sizeof(*ctx), GFP_KERNEL); + * KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ctx); + * + * ctx->pdrv.probe = kunit_platform_driver_probe; + * ctx->pdrv.driver.name = "kunit-platform"; + * ctx->pdrv.driver.owner = THIS_MODULE; + * + * KUNIT_EXPECT_EQ(test, 0, platform_driver_register_kunit(test, &ctx->pdrv)); + * KUNIT_EXPECT_STREQ(test, ctx->data, "test data"); + * } + * + * Return: 0 on success, negative errno on failure. + */ +int platform_driver_register_kunit(struct kunit *test, + struct platform_driver *drv) +{ + int ret; + + ret = platform_driver_register(drv); + if (ret) + return ret; + + /* + * Wait for the driver to probe (or at least flush out of the deferred + * workqueue) + */ + wait_for_device_probe(); + + return kunit_add_action_or_reset(test, + (kunit_action_t *)&platform_driver_unregister, + drv); +} +EXPORT_SYMBOL_GPL(platform_driver_register_kunit); diff --git a/include/kunit/platform_device.h b/include/kunit/platform_device.h new file mode 100644 index 000000000000..28d28abf15a4 --- /dev/null +++ b/include/kunit/platform_device.h @@ -0,0 +1,15 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _KUNIT_PLATFORM_DRIVER_H +#define _KUNIT_PLATFORM_DRIVER_H + +struct kunit; +struct platform_device; +struct platform_driver; + +struct platform_device * +platform_device_alloc_kunit(struct kunit *test, const char *name, int id); +int platform_device_add_kunit(struct kunit *test, struct platform_device *pdev); + +int platform_driver_register_kunit(struct kunit *test, struct platform_driver *drv); + +#endif

Describe a binding for a device that consumes a fixed rate clk in DT so that a KUnit test can get the clk registered by of_fixed_clk_setup() and test that it is setup properly.

Reviewed-by: Rob Herring robh@kernel.org Cc: Krzysztof Kozlowski krzysztof.kozlowski+dt@linaro.org Cc: Conor Dooley conor+dt@kernel.org Cc: Brendan Higgins brendan.higgins@linux.dev Cc: David Gow davidgow@google.com Cc: Rae Moar rmoar@google.com Signed-off-by: Stephen Boyd sboyd@kernel.org --- .../bindings/test/test,clk-fixed-rate.yaml | 35 +++++++++++++++++++ 1 file changed, 35 insertions(+) create mode 100644 Documentation/devicetree/bindings/test/test,clk-fixed-rate.yaml

diff --git a/Documentation/devicetree/bindings/test/test,clk-fixed-rate.yaml b/Documentation/devicetree/bindings/test/test,clk-fixed-rate.yaml new file mode 100644 index 000000000000..b9f58cba944c --- /dev/null +++ b/Documentation/devicetree/bindings/test/test,clk-fixed-rate.yaml @@ -0,0 +1,35 @@ +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/test/test,clk-fixed-rate.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: KUnit clk fixed rate test clk consumer + +maintainers: + - Stephen Boyd sboyd@kernel.org + +description: + A clk consumer of a fixed rate clk used to test the fixed rate clk + implementation. + +properties: + compatible: + const: test,clk-fixed-rate + + clocks: + maxItems: 1 + +required: + - compatible + - clocks + +additionalProperties: false + +examples: + - | + clock-consumer { + compatible = "test,clk-fixed-rate"; + clocks = <&fixed_clk>; + }; +...

Test that the fixed rate basic type clk works as intended.

Cc: Brendan Higgins brendan.higgins@linux.dev Cc: David Gow davidgow@google.com Cc: Rae Moar rmoar@google.com Signed-off-by: Stephen Boyd sboyd@kernel.org --- drivers/clk/.kunitconfig | 2 + drivers/clk/Kconfig | 8 + drivers/clk/Makefile | 1 + drivers/clk/clk-fixed-rate_test.c | 377 +++++++++++++++++++++ drivers/clk/clk-fixed-rate_test.h | 8 + drivers/clk/kunit_clk_fixed_rate_test.dtso | 19 ++ 6 files changed, 415 insertions(+) create mode 100644 drivers/clk/clk-fixed-rate_test.c create mode 100644 drivers/clk/clk-fixed-rate_test.h create mode 100644 drivers/clk/kunit_clk_fixed_rate_test.dtso

diff --git a/drivers/clk/.kunitconfig b/drivers/clk/.kunitconfig index efa12ac2b3f2..54ece9207055 100644 --- a/drivers/clk/.kunitconfig +++ b/drivers/clk/.kunitconfig @@ -1,6 +1,8 @@ CONFIG_KUNIT=y +CONFIG_OF=y CONFIG_COMMON_CLK=y CONFIG_CLK_KUNIT_TEST=y +CONFIG_CLK_FIXED_RATE_KUNIT_TEST=y CONFIG_CLK_GATE_KUNIT_TEST=y CONFIG_CLK_FD_KUNIT_TEST=y CONFIG_UML_PCI_OVER_VIRTIO=n diff --git a/drivers/clk/Kconfig b/drivers/clk/Kconfig index 50af5fc7f570..6e66d04dd11d 100644 --- a/drivers/clk/Kconfig +++ b/drivers/clk/Kconfig @@ -510,6 +510,14 @@ config CLK_KUNIT_TEST help Kunit tests for the common clock framework.

+config CLK_FIXED_RATE_KUNIT_TEST + tristate "Basic fixed rate clk type KUnit test" if !KUNIT_ALL_TESTS + depends on KUNIT + default KUNIT_ALL_TESTS + select OF_OVERLAY if OF + help + KUnit tests for the basic fixed rate clk type. + config CLK_GATE_KUNIT_TEST tristate "Basic gate type Kunit test" if !KUNIT_ALL_TESTS depends on KUNIT diff --git a/drivers/clk/Makefile b/drivers/clk/Makefile index 1fd74658a801..816abac45fbd 100644 --- a/drivers/clk/Makefile +++ b/drivers/clk/Makefile @@ -6,6 +6,7 @@ obj-$(CONFIG_CLK_KUNIT_TEST) += clk_test.o obj-$(CONFIG_COMMON_CLK) += clk-divider.o obj-$(CONFIG_COMMON_CLK) += clk-fixed-factor.o obj-$(CONFIG_COMMON_CLK) += clk-fixed-rate.o +obj-$(CONFIG_CLK_FIXED_RATE_KUNIT_TEST) += clk-fixed-rate_test.o kunit_clk_fixed_rate_test.dtbo.o obj-$(CONFIG_COMMON_CLK) += clk-gate.o obj-$(CONFIG_CLK_GATE_KUNIT_TEST) += clk-gate_test.o obj-$(CONFIG_COMMON_CLK) += clk-multiplier.o diff --git a/drivers/clk/clk-fixed-rate_test.c b/drivers/clk/clk-fixed-rate_test.c new file mode 100644 index 000000000000..d1dd7c1568f2 --- /dev/null +++ b/drivers/clk/clk-fixed-rate_test.c @@ -0,0 +1,377 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * KUnit test for clk fixed rate basic type + */ +#include <linux/clk.h> +#include <linux/clk-provider.h> +#include <linux/of.h> +#include <linux/platform_device.h> + +#include <kunit/clk.h> +#include <kunit/of.h> +#include <kunit/platform_device.h> +#include <kunit/resource.h> +#include <kunit/test.h> + +#include "clk-fixed-rate_test.h" + +/** + * struct clk_hw_fixed_rate_kunit_params - Parameters to pass to __clk_hw_register_fixed_rate() + * @dev: device registering clk + * @np: device_node of device registering clk + * @name: name of clk + * @parent_name: parent name of clk + * @parent_hw: clk_hw pointer to parent of clk + * @parent_data: parent_data describing parent of clk + * @flags: clk framework flags + * @fixed_rate: frequency of clk + * @fixed_accuracy: accuracy of clk + * @clk_fixed_flags: fixed rate specific clk flags + */ +struct clk_hw_fixed_rate_kunit_params { + struct device *dev; + struct device_node *np; + const char *name; + const char *parent_name; + const struct clk_hw *parent_hw; + const struct clk_parent_data *parent_data; + unsigned long flags; + unsigned long fixed_rate; + unsigned long fixed_accuracy; + unsigned long clk_fixed_flags; +}; + +static int +clk_hw_register_fixed_rate_kunit_init(struct kunit_resource *res, void *context) +{ + struct clk_hw_fixed_rate_kunit_params *params = context; + struct clk_hw *hw; + + hw = __clk_hw_register_fixed_rate(params->dev, params->np, + params->name, + params->parent_name, + params->parent_hw, + params->parent_data, + params->flags, + params->fixed_rate, + params->fixed_accuracy, + params->clk_fixed_flags, + false); + if (IS_ERR(hw)) + return PTR_ERR(hw); + + res->data = hw; + + return 0; +} + +static void clk_hw_register_fixed_rate_kunit_exit(struct kunit_resource *res) +{ + struct clk_hw *hw = res->data; + + clk_hw_unregister_fixed_rate(hw); +} + +/** + * clk_hw_register_fixed_rate_kunit() - Test managed __clk_hw_register_fixed_rate() + * @test: The test context + * @params: Arguments to __clk_hw_register_fixed_rate() + * + * Return: Registered fixed rate clk_hw or ERR_PTR on failure + */ +static struct clk_hw * +clk_hw_register_fixed_rate_kunit(struct kunit *test, + struct clk_hw_fixed_rate_kunit_params *params) +{ + struct clk_hw *hw; + + hw = kunit_alloc_resource(test, + clk_hw_register_fixed_rate_kunit_init, + clk_hw_register_fixed_rate_kunit_exit, + GFP_KERNEL, params); + if (!hw) + return ERR_PTR(-EINVAL); + + return hw; +} + +/** + * clk_hw_unregister_fixed_rate_kunit() - Test managed clk_hw_unregister_fixed_rate() + * @test: The test context + * @hw: fixed rate clk to unregister upon test completion + * + * Automatically unregister @hw when @test is complete via + * clk_hw_unregister_fixed_rate(). + * + * Return: 0 on success or negative errno on failure + */ +static int clk_hw_unregister_fixed_rate_kunit(struct kunit *test, struct clk_hw *hw) +{ + if (!kunit_alloc_resource(test, NULL, + clk_hw_register_fixed_rate_kunit_exit, + GFP_KERNEL, hw)) + return -ENOMEM; + + return 0; +} + +/* + * Test that clk_get_rate() on a fixed rate clk registered with + * clk_hw_register_fixed_rate() gets the proper frequency. + */ +static void clk_fixed_rate_rate_test(struct kunit *test) +{ + struct clk_hw *hw; + struct clk *clk; + const unsigned long fixed_rate = 230000; + + hw = clk_hw_register_fixed_rate(NULL, "test-fixed-rate", NULL, 0, fixed_rate); + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, hw); + KUNIT_ASSERT_EQ(test, 0, clk_hw_unregister_fixed_rate_kunit(test, hw)); + + clk = clk_hw_get_clk_prepared_enabled_kunit(test, hw, __func__); + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, clk); + + KUNIT_EXPECT_EQ(test, fixed_rate, clk_get_rate(clk)); +} + +/* + * Test that clk_get_accuracy() on a fixed rate clk registered via + * clk_hw_register_fixed_rate_with_accuracy() gets the proper accuracy. + */ +static void clk_fixed_rate_accuracy_test(struct kunit *test) +{ + struct clk_hw *hw; + struct clk *clk; + const unsigned long fixed_accuracy = 5000; + + hw = clk_hw_register_fixed_rate_with_accuracy(NULL, "test-fixed-rate", + NULL, 0, 0, + fixed_accuracy); + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, hw); + KUNIT_ASSERT_EQ(test, 0, clk_hw_unregister_fixed_rate_kunit(test, hw)); + + clk = clk_hw_get_clk_kunit(test, hw, __func__); + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, clk); + + KUNIT_EXPECT_EQ(test, fixed_accuracy, clk_get_accuracy(clk)); +} + +/* Test suite for a fixed rate clk without any parent */ +static struct kunit_case clk_fixed_rate_test_cases[] = { + KUNIT_CASE(clk_fixed_rate_rate_test), + KUNIT_CASE(clk_fixed_rate_accuracy_test), + {} +}; + +static struct kunit_suite clk_fixed_rate_suite = { + .name = "clk_fixed_rate", + .test_cases = clk_fixed_rate_test_cases, +}; + +/* + * Test that clk_get_parent() on a fixed rate clk gets the proper parent. + */ +static void clk_fixed_rate_parent_test(struct kunit *test) +{ + struct clk_hw *hw, *parent_hw; + struct clk *expected_parent, *actual_parent; + struct clk *clk; + const char *parent_name = "test-fixed-rate-parent"; + struct clk_hw_fixed_rate_kunit_params parent_params = { + .name = parent_name, + }; + + parent_hw = clk_hw_register_fixed_rate_kunit(test, &parent_params); + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, parent_hw); + KUNIT_ASSERT_STREQ(test, parent_name, clk_hw_get_name(parent_hw)); + + expected_parent = clk_hw_get_clk_kunit(test, parent_hw, __func__); + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, expected_parent); + + hw = clk_hw_register_fixed_rate(NULL, "test-fixed-rate", parent_name, 0, 0); + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, hw); + KUNIT_ASSERT_EQ(test, 0, clk_hw_unregister_fixed_rate_kunit(test, hw)); + + clk = clk_hw_get_clk_kunit(test, hw, __func__); + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, clk); + + actual_parent = clk_get_parent(clk); + KUNIT_EXPECT_TRUE(test, clk_is_match(expected_parent, actual_parent)); +} + +/* + * Test that clk_get_rate() on a fixed rate clk ignores the parent rate. + */ +static void clk_fixed_rate_parent_rate_test(struct kunit *test) +{ + struct clk_hw *hw, *parent_hw; + struct clk *clk; + const unsigned long expected_rate = 1405; + const unsigned long parent_rate = 90402; + const char *parent_name = "test-fixed-rate-parent"; + struct clk_hw_fixed_rate_kunit_params parent_params = { + .name = parent_name, + .fixed_rate = parent_rate, + }; + + parent_hw = clk_hw_register_fixed_rate_kunit(test, &parent_params); + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, parent_hw); + KUNIT_ASSERT_STREQ(test, parent_name, clk_hw_get_name(parent_hw)); + + hw = clk_hw_register_fixed_rate(NULL, "test-fixed-rate", parent_name, 0, + expected_rate); + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, hw); + KUNIT_ASSERT_EQ(test, 0, clk_hw_unregister_fixed_rate_kunit(test, hw)); + + clk = clk_hw_get_clk_prepared_enabled_kunit(test, hw, __func__); + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, clk); + + KUNIT_EXPECT_EQ(test, expected_rate, clk_get_rate(clk)); +} + +/* + * Test that clk_get_accuracy() on a fixed rate clk ignores the parent accuracy. + */ +static void clk_fixed_rate_parent_accuracy_test(struct kunit *test) +{ + struct clk_hw *hw, *parent_hw; + struct clk *clk; + const unsigned long expected_accuracy = 900; + const unsigned long parent_accuracy = 24000; + const char *parent_name = "test-fixed-rate-parent"; + struct clk_hw_fixed_rate_kunit_params parent_params = { + .name = parent_name, + .fixed_accuracy = parent_accuracy, + }; + + parent_hw = clk_hw_register_fixed_rate_kunit(test, &parent_params); + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, parent_hw); + KUNIT_ASSERT_STREQ(test, parent_name, clk_hw_get_name(parent_hw)); + + hw = clk_hw_register_fixed_rate_with_accuracy(NULL, "test-fixed-rate", + parent_name, 0, 0, + expected_accuracy); + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, hw); + KUNIT_ASSERT_EQ(test, 0, clk_hw_unregister_fixed_rate_kunit(test, hw)); + + clk = clk_hw_get_clk_kunit(test, hw, __func__); + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, clk); + + KUNIT_EXPECT_EQ(test, expected_accuracy, clk_get_accuracy(clk)); +} + +/* Test suite for a fixed rate clk with a parent */ +static struct kunit_case clk_fixed_rate_parent_test_cases[] = { + KUNIT_CASE(clk_fixed_rate_parent_test), + KUNIT_CASE(clk_fixed_rate_parent_rate_test), + KUNIT_CASE(clk_fixed_rate_parent_accuracy_test), + {} +}; + +static struct kunit_suite clk_fixed_rate_parent_suite = { + .name = "clk_fixed_rate_parent", + .test_cases = clk_fixed_rate_parent_test_cases, +}; + +struct clk_fixed_rate_of_test_context { + struct device *dev; + struct platform_driver pdrv; +}; + +static inline struct clk_fixed_rate_of_test_context * +pdev_to_clk_fixed_rate_of_test_context(struct platform_device *pdev) +{ + return container_of(to_platform_driver(pdev->dev.driver), + struct clk_fixed_rate_of_test_context, + pdrv); +} + +/* + * Test that of_fixed_clk_setup() registers a fixed rate clk with the proper + * rate. + */ +static void clk_fixed_rate_of_probe_test(struct kunit *test) +{ + struct clk_fixed_rate_of_test_context *ctx = test->priv; + struct device *dev = ctx->dev; + struct clk *clk; + + clk = clk_get_kunit(test, dev, NULL); + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, clk); + + KUNIT_ASSERT_EQ(test, 0, clk_prepare_enable_kunit(test, clk)); + KUNIT_EXPECT_EQ(test, TEST_FIXED_FREQUENCY, clk_get_rate(clk)); +} + +/* + * Test that of_fixed_clk_setup() registers a fixed rate clk with the proper + * accuracy. + */ +static void clk_fixed_rate_of_accuracy_test(struct kunit *test) +{ + struct clk_fixed_rate_of_test_context *ctx = test->priv; + struct device *dev = ctx->dev; + struct clk *clk; + + clk = clk_get_kunit(test, dev, NULL); + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, clk); + + KUNIT_EXPECT_EQ(test, TEST_FIXED_ACCURACY, clk_get_accuracy(clk)); +} + +static struct kunit_case clk_fixed_rate_of_cases[] = { + KUNIT_CASE(clk_fixed_rate_of_probe_test), + KUNIT_CASE(clk_fixed_rate_of_accuracy_test), + {} +}; + +static int clk_fixed_rate_of_test_probe(struct platform_device *pdev) +{ + struct clk_fixed_rate_of_test_context *ctx; + + ctx = pdev_to_clk_fixed_rate_of_test_context(pdev); + ctx->dev = &pdev->dev; + + return 0; +} + +static int clk_fixed_rate_of_init(struct kunit *test) +{ + struct clk_fixed_rate_of_test_context *ctx; + static const struct of_device_id match_table[] = { + { .compatible = "test,clk-fixed-rate" }, + { } + }; + + KUNIT_ASSERT_EQ(test, 0, + of_overlay_apply_kunit(test, kunit_clk_fixed_rate_test)); + + ctx = kunit_kzalloc(test, sizeof(*ctx), GFP_KERNEL); + if (!ctx) + return -ENOMEM; + test->priv = ctx; + + ctx->pdrv.probe = clk_fixed_rate_of_test_probe; + ctx->pdrv.driver.of_match_table = match_table; + ctx->pdrv.driver.name = __func__; + ctx->pdrv.driver.owner = THIS_MODULE; + + KUNIT_ASSERT_EQ(test, 0, + platform_driver_register_kunit(test, &ctx->pdrv)); + + return 0; +} + +static struct kunit_suite clk_fixed_rate_of_suite = { + .name = "clk_fixed_rate_of", + .init = clk_fixed_rate_of_init, + .test_cases = clk_fixed_rate_of_cases, +}; + +kunit_test_suites( + &clk_fixed_rate_suite, + &clk_fixed_rate_of_suite, + &clk_fixed_rate_parent_suite, +); +MODULE_LICENSE("GPL"); diff --git a/drivers/clk/clk-fixed-rate_test.h b/drivers/clk/clk-fixed-rate_test.h new file mode 100644 index 000000000000..e0d28e5b6081 --- /dev/null +++ b/drivers/clk/clk-fixed-rate_test.h @@ -0,0 +1,8 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _CLK_FIXED_RATE_TEST_H +#define _CLK_FIXED_RATE_TEST_H + +#define TEST_FIXED_FREQUENCY 50000000 +#define TEST_FIXED_ACCURACY 300 + +#endif diff --git a/drivers/clk/kunit_clk_fixed_rate_test.dtso b/drivers/clk/kunit_clk_fixed_rate_test.dtso new file mode 100644 index 000000000000..10989b07e5b3 --- /dev/null +++ b/drivers/clk/kunit_clk_fixed_rate_test.dtso @@ -0,0 +1,19 @@ +// SPDX-License-Identifier: GPL-2.0 +/dts-v1/; +/plugin/; + +#include "clk-fixed-rate_test.h" + +&{/} { + fixed_50MHz: kunit-clock { + compatible = "fixed-clock"; + #clock-cells = <0>; + clock-frequency = <TEST_FIXED_FREQUENCY>; + clock-accuracy = <TEST_FIXED_ACCURACY>; + }; + + kunit-clock-consumer { + compatible = "test,clk-fixed-rate"; + clocks = <&fixed_50MHz>; + }; +};

Test that clks registered with 'struct clk_parent_data' work as intended and can find their parents.

Cc: Christian Marangi ansuelsmth@gmail.com Cc: Brendan Higgins brendan.higgins@linux.dev Cc: David Gow davidgow@google.com Cc: Rae Moar rmoar@google.com Signed-off-by: Stephen Boyd sboyd@kernel.org --- drivers/clk/Kconfig | 1 + drivers/clk/Makefile | 3 +- drivers/clk/clk_parent_data_test.h | 10 + drivers/clk/clk_test.c | 451 +++++++++++++++++++- drivers/clk/kunit_clk_parent_data_test.dtso | 28 ++ 5 files changed, 491 insertions(+), 2 deletions(-) create mode 100644 drivers/clk/clk_parent_data_test.h create mode 100644 drivers/clk/kunit_clk_parent_data_test.dtso

diff --git a/drivers/clk/Kconfig b/drivers/clk/Kconfig index 6e66d04dd11d..755333c77298 100644 --- a/drivers/clk/Kconfig +++ b/drivers/clk/Kconfig @@ -507,6 +507,7 @@ config CLK_KUNIT_TEST tristate "Basic Clock Framework Kunit Tests" if !KUNIT_ALL_TESTS depends on KUNIT default KUNIT_ALL_TESTS + select OF_OVERLAY if OF help Kunit tests for the common clock framework.

diff --git a/drivers/clk/Makefile b/drivers/clk/Makefile index 816abac45fbd..990e87ee4f92 100644 --- a/drivers/clk/Makefile +++ b/drivers/clk/Makefile @@ -2,7 +2,8 @@ # common clock types obj-$(CONFIG_HAVE_CLK) += clk-devres.o clk-bulk.o clkdev.o obj-$(CONFIG_COMMON_CLK) += clk.o -obj-$(CONFIG_CLK_KUNIT_TEST) += clk_test.o +obj-$(CONFIG_CLK_KUNIT_TEST) += clk_test.o \ + kunit_clk_parent_data_test.dtbo.o obj-$(CONFIG_COMMON_CLK) += clk-divider.o obj-$(CONFIG_COMMON_CLK) += clk-fixed-factor.o obj-$(CONFIG_COMMON_CLK) += clk-fixed-rate.o diff --git a/drivers/clk/clk_parent_data_test.h b/drivers/clk/clk_parent_data_test.h new file mode 100644 index 000000000000..eedd53ae910d --- /dev/null +++ b/drivers/clk/clk_parent_data_test.h @@ -0,0 +1,10 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _CLK_PARENT_DATA_TEST_H +#define _CLK_PARENT_DATA_TEST_H + +#define CLK_PARENT_DATA_1MHZ_NAME "1mhz_fixed_legacy" +#define CLK_PARENT_DATA_PARENT1 "parent_fwname" +#define CLK_PARENT_DATA_PARENT2 "50" +#define CLK_PARENT_DATA_50MHZ_NAME "50_clk" + +#endif diff --git a/drivers/clk/clk_test.c b/drivers/clk/clk_test.c index 39e2b5ff4f51..655bf0909fb7 100644 --- a/drivers/clk/clk_test.c +++ b/drivers/clk/clk_test.c @@ -4,12 +4,19 @@ */ #include <linux/clk.h> #include <linux/clk-provider.h> +#include <linux/of.h> +#include <linux/platform_device.h>

/* Needed for clk_hw_get_clk() */ #include "clk.h"

+#include <kunit/clk.h> +#include <kunit/of.h> +#include <kunit/platform_device.h> #include <kunit/test.h>

+#include "clk_parent_data_test.h" + static const struct clk_ops empty_clk_ops = { };

#define DUMMY_CLOCK_INIT_RATE (42 * 1000 * 1000) @@ -2659,6 +2666,446 @@ static struct kunit_suite clk_mux_no_reparent_test_suite = { .test_cases = clk_mux_no_reparent_test_cases, };

+struct clk_register_clk_parent_data_test_case { + const char *desc; + struct clk_parent_data pdata; +}; + +static void +clk_register_clk_parent_data_test_case_to_desc( + const struct clk_register_clk_parent_data_test_case *t, char *desc) +{ + strcpy(desc, t->desc); +} + +static const struct clk_register_clk_parent_data_test_case +clk_register_clk_parent_data_of_cases[] = { + { + /* + * Test that a clk registered with a struct device_node can + * find a parent based on struct clk_parent_data::index. + */ + .desc = "clk_parent_data_of_index_test", + .pdata.index = 0, + }, + { + /* + * Test that a clk registered with a struct device_node can + * find a parent based on struct clk_parent_data::fwname. + */ + .desc = "clk_parent_data_of_fwname_test", + .pdata.fw_name = CLK_PARENT_DATA_PARENT1, + }, + { + /* + * Test that a clk registered with a struct device_node can + * find a parent based on struct clk_parent_data::name. + */ + .desc = "clk_parent_data_of_name_test", + /* The index must be negative to indicate firmware not used */ + .pdata.index = -1, + .pdata.name = CLK_PARENT_DATA_1MHZ_NAME, + }, + { + /* + * Test that a clk registered with a struct device_node can + * find a parent based on struct + * clk_parent_data::{fw_name,name}. + */ + .desc = "clk_parent_data_of_fwname_name_test", + .pdata.fw_name = CLK_PARENT_DATA_PARENT1, + .pdata.name = "not_matching", + }, + { + /* + * Test that a clk registered with a struct device_node can + * find a parent based on struct clk_parent_data::{index,name}. + * Index takes priority. + */ + .desc = "clk_parent_data_of_index_name_priority_test", + .pdata.index = 0, + .pdata.name = "not_matching", + }, + { + /* + * Test that a clk registered with a struct device_node can + * find a parent based on struct + * clk_parent_data::{index,fwname,name}. The fw_name takes + * priority over index and name. + */ + .desc = "clk_parent_data_of_index_fwname_name_priority_test", + .pdata.index = 1, + .pdata.fw_name = CLK_PARENT_DATA_PARENT1, + .pdata.name = "not_matching", + }, +}; + +KUNIT_ARRAY_PARAM(clk_register_clk_parent_data_of_test, clk_register_clk_parent_data_of_cases, + clk_register_clk_parent_data_test_case_to_desc) + +/** + * struct clk_register_clk_parent_data_of_ctx - Context for clk_parent_data OF tests + * @np: device node of clk under test + * @hw: clk_hw for clk under test + */ +struct clk_register_clk_parent_data_of_ctx { + struct device_node *np; + struct clk_hw hw; +}; + +static int clk_register_clk_parent_data_of_test_init(struct kunit *test) +{ + struct clk_register_clk_parent_data_of_ctx *ctx; + + KUNIT_ASSERT_EQ(test, 0, + of_overlay_apply_kunit(test, kunit_clk_parent_data_test)); + + ctx = kunit_kzalloc(test, sizeof(*ctx), GFP_KERNEL); + if (!ctx) + return -ENOMEM; + test->priv = ctx; + + ctx->np = of_find_compatible_node(NULL, NULL, "test,clk-parent-data"); + if (!ctx->np) + return -ENODEV; + + return kunit_add_action_or_reset(test, (kunit_action_t *)&of_node_put, ctx->np); +} + +/* + * Test that a clk registered with a struct device_node can find a parent based on + * struct clk_parent_data when the hw member isn't set. + */ +static void clk_register_clk_parent_data_of_test(struct kunit *test) +{ + struct clk_register_clk_parent_data_of_ctx *ctx = test->priv; + struct clk_hw *parent_hw; + const struct clk_register_clk_parent_data_test_case *test_param; + struct clk_init_data init = { }; + struct clk *expected_parent, *actual_parent; + + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ctx->np); + + expected_parent = of_clk_get_kunit(test, ctx->np, 0); + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, expected_parent); + + test_param = test->param_value; + init.parent_data = &test_param->pdata; + init.num_parents = 1; + init.name = "parent_data_of_test_clk"; + init.ops = &clk_dummy_single_parent_ops; + ctx->hw.init = &init; + KUNIT_ASSERT_EQ(test, 0, of_clk_hw_register_kunit(test, ctx->np, &ctx->hw)); + + parent_hw = clk_hw_get_parent(&ctx->hw); + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, parent_hw); + + actual_parent = clk_hw_get_clk_kunit(test, parent_hw, __func__); + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, actual_parent); + + KUNIT_EXPECT_TRUE(test, clk_is_match(expected_parent, actual_parent)); +} + +static struct kunit_case clk_register_clk_parent_data_of_test_cases[] = { + KUNIT_CASE_PARAM(clk_register_clk_parent_data_of_test, + clk_register_clk_parent_data_of_test_gen_params), + {} +}; + +/* + * Test suite for registering clks with struct clk_parent_data and a struct + * device_node. + */ +static struct kunit_suite clk_register_clk_parent_data_of_suite = { + .name = "clk_register_clk_parent_data_of", + .init = clk_register_clk_parent_data_of_test_init, + .test_cases = clk_register_clk_parent_data_of_test_cases, +}; + +/** + * struct clk_register_clk_parent_data_device_ctx - Context for clk_parent_data device tests + * @dev: device of clk under test + * @hw: clk_hw for clk under test + * @pdrv: driver to attach to find @dev + */ +struct clk_register_clk_parent_data_device_ctx { + struct device *dev; + struct clk_hw hw; + struct platform_driver pdrv; +}; + +static inline struct clk_register_clk_parent_data_device_ctx * +clk_register_clk_parent_data_driver_to_test_context(struct platform_device *pdev) +{ + return container_of(to_platform_driver(pdev->dev.driver), + struct clk_register_clk_parent_data_device_ctx, pdrv); +} + +static int clk_register_clk_parent_data_device_probe(struct platform_device *pdev) +{ + struct clk_register_clk_parent_data_device_ctx *ctx; + + ctx = clk_register_clk_parent_data_driver_to_test_context(pdev); + ctx->dev = &pdev->dev; + + return 0; +} + +static void clk_register_clk_parent_data_device_driver(struct kunit *test) +{ + struct clk_register_clk_parent_data_device_ctx *ctx = test->priv; + static const struct of_device_id match_table[] = { + { .compatible = "test,clk-parent-data" }, + { } + }; + + ctx->pdrv.probe = clk_register_clk_parent_data_device_probe; + ctx->pdrv.driver.of_match_table = match_table; + ctx->pdrv.driver.name = __func__; + ctx->pdrv.driver.owner = THIS_MODULE; + + KUNIT_ASSERT_EQ(test, 0, platform_driver_register_kunit(test, &ctx->pdrv)); + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ctx->dev); +} + +static const struct clk_register_clk_parent_data_test_case +clk_register_clk_parent_data_device_cases[] = { + { + /* + * Test that a clk registered with a struct device can find a + * parent based on struct clk_parent_data::index. + */ + .desc = "clk_parent_data_device_index_test", + .pdata.index = 1, + }, + { + /* + * Test that a clk registered with a struct device can find a + * parent based on struct clk_parent_data::fwname. + */ + .desc = "clk_parent_data_device_fwname_test", + .pdata.fw_name = CLK_PARENT_DATA_PARENT2, + }, + { + /* + * Test that a clk registered with a struct device can find a + * parent based on struct clk_parent_data::name. + */ + .desc = "clk_parent_data_device_name_test", + /* The index must be negative to indicate firmware not used */ + .pdata.index = -1, + .pdata.name = CLK_PARENT_DATA_50MHZ_NAME, + }, + { + /* + * Test that a clk registered with a struct device can find a + * parent based on struct clk_parent_data::{fw_name,name}. + */ + .desc = "clk_parent_data_device_fwname_name_test", + .pdata.fw_name = CLK_PARENT_DATA_PARENT2, + .pdata.name = "not_matching", + }, + { + /* + * Test that a clk registered with a struct device can find a + * parent based on struct clk_parent_data::{index,name}. Index + * takes priority. + */ + .desc = "clk_parent_data_device_index_name_priority_test", + .pdata.index = 1, + .pdata.name = "not_matching", + }, + { + /* + * Test that a clk registered with a struct device can find a + * parent based on struct clk_parent_data::{index,fwname,name}. + * The fw_name takes priority over index and name. + */ + .desc = "clk_parent_data_device_index_fwname_name_priority_test", + .pdata.index = 0, + .pdata.fw_name = CLK_PARENT_DATA_PARENT2, + .pdata.name = "not_matching", + }, +}; + +KUNIT_ARRAY_PARAM(clk_register_clk_parent_data_device_test, + clk_register_clk_parent_data_device_cases, + clk_register_clk_parent_data_test_case_to_desc) + +/* + * Test that a clk registered with a struct device can find a parent based on + * struct clk_parent_data when the hw member isn't set. + */ +static void clk_register_clk_parent_data_device_test(struct kunit *test) +{ + struct clk_register_clk_parent_data_device_ctx *ctx; + const struct clk_register_clk_parent_data_test_case *test_param; + struct clk_hw *parent_hw; + struct clk_init_data init = { }; + struct clk *expected_parent, *actual_parent; + + ctx = kunit_kzalloc(test, sizeof(*ctx), GFP_KERNEL); + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ctx); + test->priv = ctx; + + clk_register_clk_parent_data_device_driver(test); + + expected_parent = clk_get_kunit(test, ctx->dev, "50"); + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, expected_parent); + + test_param = test->param_value; + init.parent_data = &test_param->pdata; + init.num_parents = 1; + init.name = "parent_data_device_test_clk"; + init.ops = &clk_dummy_single_parent_ops; + ctx->hw.init = &init; + KUNIT_ASSERT_EQ(test, 0, clk_hw_register_kunit(test, ctx->dev, &ctx->hw)); + + parent_hw = clk_hw_get_parent(&ctx->hw); + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, parent_hw); + + actual_parent = clk_hw_get_clk_kunit(test, parent_hw, __func__); + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, actual_parent); + + KUNIT_EXPECT_TRUE(test, clk_is_match(expected_parent, actual_parent)); +} + +static const struct clk_register_clk_parent_data_test_case +clk_register_clk_parent_data_device_hw_cases[] = { + { + /* + * Test that a clk registered with a struct device can find a + * parent based on struct clk_parent_data::hw. + */ + .desc = "clk_parent_data_device_hw_index_test", + /* The index must be negative to indicate firmware not used */ + .pdata.index = -1, + }, + { + /* + * Test that a clk registered with a struct device can find a + * parent based on struct clk_parent_data::hw when + * struct clk_parent_data::fw_name is set. + */ + .desc = "clk_parent_data_device_hw_fwname_test", + .pdata.fw_name = CLK_PARENT_DATA_PARENT2, + }, + { + /* + * Test that a clk registered with a struct device can find a + * parent based on struct clk_parent_data::hw when struct + * clk_parent_data::name is set. + */ + .desc = "clk_parent_data_device_hw_name_test", + /* The index must be negative to indicate firmware not used */ + .pdata.index = -1, + .pdata.name = CLK_PARENT_DATA_50MHZ_NAME, + }, + { + /* + * Test that a clk registered with a struct device can find a + * parent based on struct clk_parent_data::hw when struct + * clk_parent_data::{fw_name,name} are set. + */ + .desc = "clk_parent_data_device_hw_fwname_name_test", + .pdata.fw_name = CLK_PARENT_DATA_PARENT2, + .pdata.name = "not_matching", + }, + { + /* + * Test that a clk registered with a struct device can find a + * parent based on struct clk_parent_data::hw when struct + * clk_parent_data::index is set. The hw pointer takes + * priority. + */ + .desc = "clk_parent_data_device_hw_index_priority_test", + .pdata.index = 0, + }, + { + /* + * Test that a clk registered with a struct device can find a + * parent based on struct clk_parent_data::hw when + * struct clk_parent_data::{index,fwname,name} are set. + * The hw pointer takes priority over everything else. + */ + .desc = "clk_parent_data_device_hw_index_fwname_name_priority_test", + .pdata.index = 0, + .pdata.fw_name = CLK_PARENT_DATA_PARENT2, + .pdata.name = "not_matching", + }, +}; + +KUNIT_ARRAY_PARAM(clk_register_clk_parent_data_device_hw_test, + clk_register_clk_parent_data_device_hw_cases, + clk_register_clk_parent_data_test_case_to_desc) + +/* + * Test that a clk registered with a struct device can find a + * parent based on struct clk_parent_data::hw. + */ +static void clk_register_clk_parent_data_device_hw_test(struct kunit *test) +{ + struct clk_register_clk_parent_data_device_ctx *ctx; + const struct clk_register_clk_parent_data_test_case *test_param; + struct clk_dummy_context *parent; + struct clk_hw *parent_hw; + struct clk_parent_data pdata = { }; + struct clk_init_data init = { }; + + ctx = kunit_kzalloc(test, sizeof(*ctx), GFP_KERNEL); + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ctx); + test->priv = ctx; + + clk_register_clk_parent_data_device_driver(test); + + parent = kunit_kzalloc(test, sizeof(*parent), GFP_KERNEL); + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, parent); + + parent_hw = &parent->hw; + parent_hw->init = CLK_HW_INIT_NO_PARENT("parent-clk", + &clk_dummy_rate_ops, 0); + + KUNIT_ASSERT_EQ(test, 0, clk_hw_register_kunit(test, ctx->dev, parent_hw)); + + test_param = test->param_value; + memcpy(&pdata, &test_param->pdata, sizeof(pdata)); + pdata.hw = parent_hw; + init.parent_data = &pdata; + init.num_parents = 1; + init.ops = &clk_dummy_single_parent_ops; + init.name = "parent_data_device_hw_test_clk"; + ctx->hw.init = &init; + KUNIT_ASSERT_EQ(test, 0, clk_hw_register_kunit(test, ctx->dev, &ctx->hw)); + + KUNIT_EXPECT_PTR_EQ(test, parent_hw, clk_hw_get_parent(&ctx->hw)); +} + +static struct kunit_case clk_register_clk_parent_data_device_test_cases[] = { + KUNIT_CASE_PARAM(clk_register_clk_parent_data_device_test, + clk_register_clk_parent_data_device_test_gen_params), + KUNIT_CASE_PARAM(clk_register_clk_parent_data_device_hw_test, + clk_register_clk_parent_data_device_hw_test_gen_params), + {} +}; + +static int clk_register_clk_parent_data_device_init(struct kunit *test) +{ + KUNIT_ASSERT_EQ(test, 0, + of_overlay_apply_kunit(test, kunit_clk_parent_data_test)); + + return 0; +} + +/* + * Test suite for registering clks with struct clk_parent_data and a struct + * device. + */ +static struct kunit_suite clk_register_clk_parent_data_device_suite = { + .name = "clk_register_clk_parent_data_device", + .init = clk_register_clk_parent_data_device_init, + .test_cases = clk_register_clk_parent_data_device_test_cases, +}; + kunit_test_suites( &clk_leaf_mux_set_rate_parent_test_suite, &clk_test_suite, @@ -2671,7 +3118,9 @@ kunit_test_suites( &clk_range_test_suite, &clk_range_maximize_test_suite, &clk_range_minimize_test_suite, + &clk_register_clk_parent_data_of_suite, + &clk_register_clk_parent_data_device_suite, &clk_single_parent_mux_test_suite, - &clk_uncached_test_suite + &clk_uncached_test_suite, ); MODULE_LICENSE("GPL v2"); diff --git a/drivers/clk/kunit_clk_parent_data_test.dtso b/drivers/clk/kunit_clk_parent_data_test.dtso new file mode 100644 index 000000000000..7d3ed9a5a2e8 --- /dev/null +++ b/drivers/clk/kunit_clk_parent_data_test.dtso @@ -0,0 +1,28 @@ +// SPDX-License-Identifier: GPL-2.0 +/dts-v1/; +/plugin/; + +#include "clk_parent_data_test.h" + +&{/} { + fixed_50: kunit-clock-50MHz { + compatible = "fixed-clock"; + #clock-cells = <0>; + clock-frequency = <50000000>; + clock-output-names = CLK_PARENT_DATA_50MHZ_NAME; + }; + + fixed_parent: kunit-clock-1MHz { + compatible = "fixed-clock"; + #clock-cells = <0>; + clock-frequency = <1000000>; + clock-output-names = CLK_PARENT_DATA_1MHZ_NAME; + }; + + kunit-clock-controller { + compatible = "test,clk-parent-data"; + clocks = <&fixed_parent>, <&fixed_50>; + clock-names = CLK_PARENT_DATA_PARENT1, CLK_PARENT_DATA_PARENT2; + #clock-cells = <1>; + }; +};