Add Kunit test cases for the revocable API.
The test cases cover the following scenarios: - Basic: Verifies that a consumer can successfully access the resource provided via the provider. - Revocation: Verifies that after the provider revokes the resource, the consumer correctly receives a NULL pointer on a subsequent access. - Macro: Same as "Revocation" but uses the REVOCABLE().
A way to run the test: $ ./tools/testing/kunit/kunit.py run \ --kconfig_add CONFIG_REVOCABLE_KUNIT_TEST=y \ revocable_test
Signed-off-by: Tzung-Bi Shih tzungbi@kernel.org --- v4: - REVOCABLE() -> REVOCABLE_TRY_ACCESS_WITH(). - revocable_release() -> revocable_withdraw_access().
v3: https://lore.kernel.org/chrome-platform/20250912081718.3827390-3-tzungbi@ker... - No changes.
v2: https://lore.kernel.org/chrome-platform/20250820081645.847919-3-tzungbi@kern... - New in the series.
MAINTAINERS | 1 + drivers/base/Kconfig | 8 +++ drivers/base/Makefile | 3 + drivers/base/revocable_test.c | 110 ++++++++++++++++++++++++++++++++++ 4 files changed, 122 insertions(+) create mode 100644 drivers/base/revocable_test.c
diff --git a/MAINTAINERS b/MAINTAINERS index 15d45289fda6..1f12100d1ab7 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -21957,6 +21957,7 @@ M: Tzung-Bi Shih tzungbi@kernel.org L: linux-kernel@vger.kernel.org S: Maintained F: drivers/base/revocable.c +F: drivers/base/revocable_test.c F: include/linux/revocable.h
RFKILL diff --git a/drivers/base/Kconfig b/drivers/base/Kconfig index 064eb52ff7e2..a6488035f63d 100644 --- a/drivers/base/Kconfig +++ b/drivers/base/Kconfig @@ -244,3 +244,11 @@ config FW_DEVLINK_SYNC_STATE_TIMEOUT work on.
endmenu + +# Kunit test cases +config REVOCABLE_KUNIT_TEST + tristate "Kunit tests for revocable" if !KUNIT_ALL_TESTS + depends on KUNIT + default KUNIT_ALL_TESTS + help + Kunit tests for the revocable API. diff --git a/drivers/base/Makefile b/drivers/base/Makefile index bdf854694e39..4185aaa9bbb9 100644 --- a/drivers/base/Makefile +++ b/drivers/base/Makefile @@ -35,3 +35,6 @@ ccflags-$(CONFIG_DEBUG_DRIVER) := -DDEBUG # define_trace.h needs to know how to find our header CFLAGS_trace.o := -I$(src) obj-$(CONFIG_TRACING) += trace.o + +# Kunit test cases +obj-$(CONFIG_REVOCABLE_KUNIT_TEST) += revocable_test.o diff --git a/drivers/base/revocable_test.c b/drivers/base/revocable_test.c new file mode 100644 index 000000000000..1c3e08ba0505 --- /dev/null +++ b/drivers/base/revocable_test.c @@ -0,0 +1,110 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright 2025 Google LLC + * + * Kunit tests for the revocable API. + * + * The test cases cover the following scenarios: + * + * - Basic: Verifies that a consumer can successfully access the resource + * provided via the provider. + * + * - Revocation: Verifies that after the provider revokes the resource, + * the consumer correctly receives a NULL pointer on a subsequent access. + * + * - Macro: Same as "Revocation" but uses the REVOCABLE_TRY_ACCESS_WITH(). + */ + +#include <kunit/test.h> +#include <linux/revocable.h> + +static void revocable_test_basic(struct kunit *test) +{ + struct revocable_provider *rp; + struct revocable *rev; + void *real_res = (void *)0x12345678, *res; + + rp = revocable_provider_alloc(real_res); + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, rp); + + rev = revocable_alloc(rp); + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, rev); + + res = revocable_try_access(rev); + KUNIT_EXPECT_PTR_EQ(test, res, real_res); + revocable_withdraw_access(rev); + + revocable_free(rev); + revocable_provider_revoke(rp); +} + +static void revocable_test_revocation(struct kunit *test) +{ + struct revocable_provider *rp; + struct revocable *rev; + void *real_res = (void *)0x12345678, *res; + + rp = revocable_provider_alloc(real_res); + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, rp); + + rev = revocable_alloc(rp); + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, rev); + + res = revocable_try_access(rev); + KUNIT_EXPECT_PTR_EQ(test, res, real_res); + revocable_withdraw_access(rev); + + revocable_provider_revoke(rp); + + res = revocable_try_access(rev); + KUNIT_EXPECT_PTR_EQ(test, res, NULL); + revocable_withdraw_access(rev); + + revocable_free(rev); +} + +static void revocable_test_macro(struct kunit *test) +{ + struct revocable_provider *rp; + struct revocable *rev; + void *real_res = (void *)0x12345678, *res; + bool accessed; + + rp = revocable_provider_alloc(real_res); + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, rp); + + rev = revocable_alloc(rp); + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, rev); + + accessed = false; + REVOCABLE_TRY_ACCESS_WITH(rev, res) { + KUNIT_EXPECT_PTR_EQ(test, res, real_res); + accessed = true; + } + KUNIT_EXPECT_TRUE(test, accessed); + + revocable_provider_revoke(rp); + + accessed = false; + REVOCABLE_TRY_ACCESS_WITH(rev, res) { + KUNIT_EXPECT_PTR_EQ(test, res, NULL); + accessed = true; + } + KUNIT_EXPECT_TRUE(test, accessed); + + revocable_free(rev); +} + +static struct kunit_case revocable_test_cases[] = { + KUNIT_CASE(revocable_test_basic), + KUNIT_CASE(revocable_test_revocation), + KUNIT_CASE(revocable_test_macro), + {} +}; + +static struct kunit_suite revocable_test_suite = { + .name = "revocable_test", + .test_cases = revocable_test_cases, +}; + +kunit_test_suite(revocable_test_suite);