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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> Reviewed-by: David Gow <davidgow@google.com> Cc: Rae Moar <rmoar@google.com> Reviewed-by: Rob Herring (Arm) <robh@kernel.org> Signed-off-by: Stephen Boyd <sboyd@kernel.org> Link: https://lore.kernel.org/r/20240718210513.3801024-5-sboyd@kernel.org
116 lines
3.1 KiB
C
116 lines
3.1 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* KUnit tests for device tree overlays
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*/
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#include <linux/device/bus.h>
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#include <linux/kconfig.h>
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#include <linux/of.h>
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#include <linux/of_platform.h>
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#include <linux/platform_device.h>
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#include <kunit/of.h>
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#include <kunit/test.h>
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static const char * const kunit_node_name = "kunit-test";
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static const char * const kunit_compatible = "test,empty";
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/* Test that of_overlay_apply_kunit() adds a node to the live tree */
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static void of_overlay_apply_kunit_apply(struct kunit *test)
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{
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struct device_node *np;
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KUNIT_ASSERT_EQ(test, 0,
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of_overlay_apply_kunit(test, kunit_overlay_test));
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np = of_find_node_by_name(NULL, kunit_node_name);
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KUNIT_EXPECT_NOT_ERR_OR_NULL(test, np);
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of_node_put(np);
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}
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/*
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* Test that of_overlay_apply_kunit() creates platform devices with the
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* expected device_node
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*/
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static void of_overlay_apply_kunit_platform_device(struct kunit *test)
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{
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struct platform_device *pdev;
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struct device_node *np;
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KUNIT_ASSERT_EQ(test, 0,
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of_overlay_apply_kunit(test, kunit_overlay_test));
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np = of_find_node_by_name(NULL, kunit_node_name);
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of_node_put_kunit(test, np);
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KUNIT_ASSERT_NOT_ERR_OR_NULL(test, np);
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pdev = of_find_device_by_node(np);
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KUNIT_EXPECT_NOT_ERR_OR_NULL(test, pdev);
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if (pdev)
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put_device(&pdev->dev);
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}
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static int of_overlay_bus_match_compatible(struct device *dev, const void *data)
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{
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return of_device_is_compatible(dev->of_node, data);
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}
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/* Test that of_overlay_apply_kunit() cleans up after the test is finished */
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static void of_overlay_apply_kunit_cleanup(struct kunit *test)
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{
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struct kunit fake;
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struct platform_device *pdev;
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struct device *dev;
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struct device_node *np;
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if (!IS_ENABLED(CONFIG_OF_EARLY_FLATTREE))
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kunit_skip(test, "requires CONFIG_OF_EARLY_FLATTREE for root node");
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kunit_init_test(&fake, "fake test", NULL);
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KUNIT_ASSERT_EQ(test, fake.status, KUNIT_SUCCESS);
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KUNIT_ASSERT_EQ(test, 0,
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of_overlay_apply_kunit(&fake, kunit_overlay_test));
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np = of_find_node_by_name(NULL, kunit_node_name);
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KUNIT_ASSERT_NOT_ERR_OR_NULL(test, np);
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of_node_put_kunit(test, np);
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pdev = of_find_device_by_node(np);
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KUNIT_ASSERT_NOT_ERR_OR_NULL(test, pdev);
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put_device(&pdev->dev); /* Not derefing 'pdev' after this */
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/* Remove overlay */
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kunit_cleanup(&fake);
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/* The node and device should be removed */
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np = of_find_node_by_name(NULL, kunit_node_name);
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KUNIT_EXPECT_PTR_EQ(test, NULL, np);
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of_node_put(np);
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dev = bus_find_device(&platform_bus_type, NULL, kunit_compatible,
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of_overlay_bus_match_compatible);
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KUNIT_EXPECT_PTR_EQ(test, NULL, dev);
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put_device(dev);
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}
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static struct kunit_case of_overlay_apply_kunit_test_cases[] = {
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KUNIT_CASE(of_overlay_apply_kunit_apply),
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KUNIT_CASE(of_overlay_apply_kunit_platform_device),
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KUNIT_CASE(of_overlay_apply_kunit_cleanup),
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{}
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};
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/*
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* Test suite for test managed device tree overlays.
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*/
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static struct kunit_suite of_overlay_apply_kunit_suite = {
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.name = "of_overlay_apply_kunit",
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.test_cases = of_overlay_apply_kunit_test_cases,
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};
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kunit_test_suites(
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&of_overlay_apply_kunit_suite,
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);
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("KUnit tests for device tree overlays");
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