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of: Add KUnit test to confirm DTB is loaded

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Add a KUnit test that confirms a DTB has been loaded, i.e. there is a
root node, and that the of_have_populated_dt() API works properly. We
skip the test when CONFIG_OF_EARLY_FLATREE=n because in that case we
know architecture code hasn't called unflatten_(and_copy_)?device_tree()
which would populate some sort of root node.

Cc: Rob Herring <robh+dt@kernel.org>
Cc: Frank Rowand <frowand.list@gmail.com>
Reviewed-by: David Gow <davidgow@google.com>
Cc: Brendan Higgins <brendan.higgins@linux.dev>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
Link: https://lore.kernel.org/r/20240217010557.2381548-8-sboyd@kernel.org
Signed-off-by: Rob Herring <robh@kernel.org>
This commit is contained in:
Stephen Boyd 2024-02-16 17:05:56 -08:00 committed by Rob Herring
parent d1eabd218e
commit 893ecc6d2d
4 changed files with 71 additions and 0 deletions
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3
drivers/of/.kunitconfig Normal file
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@ -0,0 +1,3 @@
CONFIG_KUNIT=y
CONFIG_OF=y
CONFIG_OF_KUNIT_TEST=y

9
drivers/of/Kconfig
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@ -36,6 +36,15 @@ config OF_UNITTEST
If unsure, say N here. This option is not safe to enable.
config OF_KUNIT_TEST
tristate "Devicetree KUnit Test" if !KUNIT_ALL_TESTS
depends on KUNIT
default KUNIT_ALL_TESTS
help
This option builds KUnit unit tests for device tree infrastructure.
If unsure, say N here, but this option is safe to enable.
config OF_ALL_DTBS
bool "Build all Device Tree Blobs"
depends on COMPILE_TEST

2
drivers/of/Makefile
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@ -19,4 +19,6 @@ obj-y += kexec.o
endif
endif
obj-$(CONFIG_OF_KUNIT_TEST) += of_test.o
obj-$(CONFIG_OF_UNITTEST) += unittest-data/

57
drivers/of/of_test.c Normal file
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@ -0,0 +1,57 @@
// SPDX-License-Identifier: GPL-2.0
/*
* KUnit tests for OF APIs
*/
#include <linux/module.h>
#include <linux/of.h>
#include <kunit/test.h>
/*
* Test that the root node "/" can be found by path.
*/
static void of_dtb_root_node_found_by_path(struct kunit *test)
{
struct device_node *np;
np = of_find_node_by_path("/");
KUNIT_EXPECT_NOT_ERR_OR_NULL(test, np);
of_node_put(np);
}
/*
* Test that the 'of_root' global variable is always populated when DT code is
* enabled. Remove this test once of_root is removed from global access.
*/
static void of_dtb_root_node_populates_of_root(struct kunit *test)
{
KUNIT_EXPECT_NOT_ERR_OR_NULL(test, of_root);
}
static struct kunit_case of_dtb_test_cases[] = {
KUNIT_CASE(of_dtb_root_node_found_by_path),
KUNIT_CASE(of_dtb_root_node_populates_of_root),
{}
};
static int of_dtb_test_init(struct kunit *test)
{
if (!IS_ENABLED(CONFIG_OF_EARLY_FLATTREE))
kunit_skip(test, "requires CONFIG_OF_EARLY_FLATTREE");
return 0;
}
/*
* Test suite to confirm a DTB is loaded.
*/
static struct kunit_suite of_dtb_suite = {
.name = "of_dtb",
.test_cases = of_dtb_test_cases,
.init = of_dtb_test_init,
};
kunit_test_suites(
&of_dtb_suite,
);
MODULE_LICENSE("GPL");