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-rw-r--r--lib/kunit/Kconfig36
-rw-r--r--lib/kunit/Makefile9
-rw-r--r--lib/kunit/assert.c141
-rw-r--r--lib/kunit/example-test.c88
-rw-r--r--lib/kunit/string-stream-test.c52
-rw-r--r--lib/kunit/string-stream.c217
-rw-r--r--lib/kunit/test-test.c331
-rw-r--r--lib/kunit/test.c478
-rw-r--r--lib/kunit/try-catch.c118
9 files changed, 1470 insertions, 0 deletions
diff --git a/lib/kunit/Kconfig b/lib/kunit/Kconfig
new file mode 100644
index 000000000000..af37016bfdd4
--- /dev/null
+++ b/lib/kunit/Kconfig
@@ -0,0 +1,36 @@
+#
+# KUnit base configuration
+#
+
+menuconfig KUNIT
+ bool "KUnit - Enable support for unit tests"
+ help
+ Enables support for kernel unit tests (KUnit), a lightweight unit
+ testing and mocking framework for the Linux kernel. These tests are
+ able to be run locally on a developer's workstation without a VM or
+ special hardware when using UML. Can also be used on most other
+ architectures. For more information, please see
+ Documentation/dev-tools/kunit/.
+
+if KUNIT
+
+config KUNIT_TEST
+ bool "KUnit test for KUnit"
+ help
+ Enables the unit tests for the KUnit test framework. These tests test
+ the KUnit test framework itself; the tests are both written using
+ KUnit and test KUnit. This option should only be enabled for testing
+ purposes by developers interested in testing that KUnit works as
+ expected.
+
+config KUNIT_EXAMPLE_TEST
+ bool "Example test for KUnit"
+ help
+ Enables an example unit test that illustrates some of the basic
+ features of KUnit. This test only exists to help new users understand
+ what KUnit is and how it is used. Please refer to the example test
+ itself, lib/kunit/example-test.c, for more information. This option
+ is intended for curious hackers who would like to understand how to
+ use KUnit for kernel development.
+
+endif # KUNIT
diff --git a/lib/kunit/Makefile b/lib/kunit/Makefile
new file mode 100644
index 000000000000..769d9402b5d3
--- /dev/null
+++ b/lib/kunit/Makefile
@@ -0,0 +1,9 @@
+obj-$(CONFIG_KUNIT) += test.o \
+ string-stream.o \
+ assert.o \
+ try-catch.o
+
+obj-$(CONFIG_KUNIT_TEST) += test-test.o \
+ string-stream-test.o
+
+obj-$(CONFIG_KUNIT_EXAMPLE_TEST) += example-test.o
diff --git a/lib/kunit/assert.c b/lib/kunit/assert.c
new file mode 100644
index 000000000000..86013d4cf891
--- /dev/null
+++ b/lib/kunit/assert.c
@@ -0,0 +1,141 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Assertion and expectation serialization API.
+ *
+ * Copyright (C) 2019, Google LLC.
+ * Author: Brendan Higgins <brendanhiggins@google.com>
+ */
+#include <kunit/assert.h>
+
+void kunit_base_assert_format(const struct kunit_assert *assert,
+ struct string_stream *stream)
+{
+ const char *expect_or_assert = NULL;
+
+ switch (assert->type) {
+ case KUNIT_EXPECTATION:
+ expect_or_assert = "EXPECTATION";
+ break;
+ case KUNIT_ASSERTION:
+ expect_or_assert = "ASSERTION";
+ break;
+ }
+
+ string_stream_add(stream, "%s FAILED at %s:%d\n",
+ expect_or_assert, assert->file, assert->line);
+}
+
+void kunit_assert_print_msg(const struct kunit_assert *assert,
+ struct string_stream *stream)
+{
+ if (assert->message.fmt)
+ string_stream_add(stream, "\n%pV", &assert->message);
+}
+
+void kunit_fail_assert_format(const struct kunit_assert *assert,
+ struct string_stream *stream)
+{
+ kunit_base_assert_format(assert, stream);
+ string_stream_add(stream, "%pV", &assert->message);
+}
+
+void kunit_unary_assert_format(const struct kunit_assert *assert,
+ struct string_stream *stream)
+{
+ struct kunit_unary_assert *unary_assert = container_of(
+ assert, struct kunit_unary_assert, assert);
+
+ kunit_base_assert_format(assert, stream);
+ if (unary_assert->expected_true)
+ string_stream_add(stream,
+ "\tExpected %s to be true, but is false\n",
+ unary_assert->condition);
+ else
+ string_stream_add(stream,
+ "\tExpected %s to be false, but is true\n",
+ unary_assert->condition);
+ kunit_assert_print_msg(assert, stream);
+}
+
+void kunit_ptr_not_err_assert_format(const struct kunit_assert *assert,
+ struct string_stream *stream)
+{
+ struct kunit_ptr_not_err_assert *ptr_assert = container_of(
+ assert, struct kunit_ptr_not_err_assert, assert);
+
+ kunit_base_assert_format(assert, stream);
+ if (!ptr_assert->value) {
+ string_stream_add(stream,
+ "\tExpected %s is not null, but is\n",
+ ptr_assert->text);
+ } else if (IS_ERR(ptr_assert->value)) {
+ string_stream_add(stream,
+ "\tExpected %s is not error, but is: %ld\n",
+ ptr_assert->text,
+ PTR_ERR(ptr_assert->value));
+ }
+ kunit_assert_print_msg(assert, stream);
+}
+
+void kunit_binary_assert_format(const struct kunit_assert *assert,
+ struct string_stream *stream)
+{
+ struct kunit_binary_assert *binary_assert = container_of(
+ assert, struct kunit_binary_assert, assert);
+
+ kunit_base_assert_format(assert, stream);
+ string_stream_add(stream,
+ "\tExpected %s %s %s, but\n",
+ binary_assert->left_text,
+ binary_assert->operation,
+ binary_assert->right_text);
+ string_stream_add(stream, "\t\t%s == %lld\n",
+ binary_assert->left_text,
+ binary_assert->left_value);
+ string_stream_add(stream, "\t\t%s == %lld",
+ binary_assert->right_text,
+ binary_assert->right_value);
+ kunit_assert_print_msg(assert, stream);
+}
+
+void kunit_binary_ptr_assert_format(const struct kunit_assert *assert,
+ struct string_stream *stream)
+{
+ struct kunit_binary_ptr_assert *binary_assert = container_of(
+ assert, struct kunit_binary_ptr_assert, assert);
+
+ kunit_base_assert_format(assert, stream);
+ string_stream_add(stream,
+ "\tExpected %s %s %s, but\n",
+ binary_assert->left_text,
+ binary_assert->operation,
+ binary_assert->right_text);
+ string_stream_add(stream, "\t\t%s == %pK\n",
+ binary_assert->left_text,
+ binary_assert->left_value);
+ string_stream_add(stream, "\t\t%s == %pK",
+ binary_assert->right_text,
+ binary_assert->right_value);
+ kunit_assert_print_msg(assert, stream);
+}
+
+void kunit_binary_str_assert_format(const struct kunit_assert *assert,
+ struct string_stream *stream)
+{
+ struct kunit_binary_str_assert *binary_assert = container_of(
+ assert, struct kunit_binary_str_assert, assert);
+
+ kunit_base_assert_format(assert, stream);
+ string_stream_add(stream,
+ "\tExpected %s %s %s, but\n",
+ binary_assert->left_text,
+ binary_assert->operation,
+ binary_assert->right_text);
+ string_stream_add(stream, "\t\t%s == %s\n",
+ binary_assert->left_text,
+ binary_assert->left_value);
+ string_stream_add(stream, "\t\t%s == %s",
+ binary_assert->right_text,
+ binary_assert->right_value);
+ kunit_assert_print_msg(assert, stream);
+}
diff --git a/lib/kunit/example-test.c b/lib/kunit/example-test.c
new file mode 100644
index 000000000000..f64a829aa441
--- /dev/null
+++ b/lib/kunit/example-test.c
@@ -0,0 +1,88 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Example KUnit test to show how to use KUnit.
+ *
+ * Copyright (C) 2019, Google LLC.
+ * Author: Brendan Higgins <brendanhiggins@google.com>
+ */
+
+#include <kunit/test.h>
+
+/*
+ * This is the most fundamental element of KUnit, the test case. A test case
+ * makes a set EXPECTATIONs and ASSERTIONs about the behavior of some code; if
+ * any expectations or assertions are not met, the test fails; otherwise, the
+ * test passes.
+ *
+ * In KUnit, a test case is just a function with the signature
+ * `void (*)(struct kunit *)`. `struct kunit` is a context object that stores
+ * information about the current test.
+ */
+static void example_simple_test(struct kunit *test)
+{
+ /*
+ * This is an EXPECTATION; it is how KUnit tests things. When you want
+ * to test a piece of code, you set some expectations about what the
+ * code should do. KUnit then runs the test and verifies that the code's
+ * behavior matched what was expected.
+ */
+ KUNIT_EXPECT_EQ(test, 1 + 1, 2);
+}
+
+/*
+ * This is run once before each test case, see the comment on
+ * example_test_suite for more information.
+ */
+static int example_test_init(struct kunit *test)
+{
+ kunit_info(test, "initializing\n");
+
+ return 0;
+}
+
+/*
+ * Here we make a list of all the test cases we want to add to the test suite
+ * below.
+ */
+static struct kunit_case example_test_cases[] = {
+ /*
+ * This is a helper to create a test case object from a test case
+ * function; its exact function is not important to understand how to
+ * use KUnit, just know that this is how you associate test cases with a
+ * test suite.
+ */
+ KUNIT_CASE(example_simple_test),
+ {}
+};
+
+/*
+ * This defines a suite or grouping of tests.
+ *
+ * Test cases are defined as belonging to the suite by adding them to
+ * `kunit_cases`.
+ *
+ * Often it is desirable to run some function which will set up things which
+ * will be used by every test; this is accomplished with an `init` function
+ * which runs before each test case is invoked. Similarly, an `exit` function
+ * may be specified which runs after every test case and can be used to for
+ * cleanup. For clarity, running tests in a test suite would behave as follows:
+ *
+ * suite.init(test);
+ * suite.test_case[0](test);
+ * suite.exit(test);
+ * suite.init(test);
+ * suite.test_case[1](test);
+ * suite.exit(test);
+ * ...;
+ */
+static struct kunit_suite example_test_suite = {
+ .name = "example",
+ .init = example_test_init,
+ .test_cases = example_test_cases,
+};
+
+/*
+ * This registers the above test suite telling KUnit that this is a suite of
+ * tests that need to be run.
+ */
+kunit_test_suite(example_test_suite);
diff --git a/lib/kunit/string-stream-test.c b/lib/kunit/string-stream-test.c
new file mode 100644
index 000000000000..76cc05eb00ed
--- /dev/null
+++ b/lib/kunit/string-stream-test.c
@@ -0,0 +1,52 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * KUnit test for struct string_stream.
+ *
+ * Copyright (C) 2019, Google LLC.
+ * Author: Brendan Higgins <brendanhiggins@google.com>
+ */
+
+#include <kunit/string-stream.h>
+#include <kunit/test.h>
+#include <linux/slab.h>
+
+static void string_stream_test_empty_on_creation(struct kunit *test)
+{
+ struct string_stream *stream = alloc_string_stream(test, GFP_KERNEL);
+
+ KUNIT_EXPECT_TRUE(test, string_stream_is_empty(stream));
+}
+
+static void string_stream_test_not_empty_after_add(struct kunit *test)
+{
+ struct string_stream *stream = alloc_string_stream(test, GFP_KERNEL);
+
+ string_stream_add(stream, "Foo");
+
+ KUNIT_EXPECT_FALSE(test, string_stream_is_empty(stream));
+}
+
+static void string_stream_test_get_string(struct kunit *test)
+{
+ struct string_stream *stream = alloc_string_stream(test, GFP_KERNEL);
+ char *output;
+
+ string_stream_add(stream, "Foo");
+ string_stream_add(stream, " %s", "bar");
+
+ output = string_stream_get_string(stream);
+ KUNIT_ASSERT_STREQ(test, output, "Foo bar");
+}
+
+static struct kunit_case string_stream_test_cases[] = {
+ KUNIT_CASE(string_stream_test_empty_on_creation),
+ KUNIT_CASE(string_stream_test_not_empty_after_add),
+ KUNIT_CASE(string_stream_test_get_string),
+ {}
+};
+
+static struct kunit_suite string_stream_test_suite = {
+ .name = "string-stream-test",
+ .test_cases = string_stream_test_cases
+};
+kunit_test_suite(string_stream_test_suite);
diff --git a/lib/kunit/string-stream.c b/lib/kunit/string-stream.c
new file mode 100644
index 000000000000..e6d17aacca30
--- /dev/null
+++ b/lib/kunit/string-stream.c
@@ -0,0 +1,217 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * C++ stream style string builder used in KUnit for building messages.
+ *
+ * Copyright (C) 2019, Google LLC.
+ * Author: Brendan Higgins <brendanhiggins@google.com>
+ */
+
+#include <kunit/string-stream.h>
+#include <kunit/test.h>
+#include <linux/list.h>
+#include <linux/slab.h>
+
+struct string_stream_fragment_alloc_context {
+ struct kunit *test;
+ int len;
+ gfp_t gfp;
+};
+
+static int string_stream_fragment_init(struct kunit_resource *res,
+ void *context)
+{
+ struct string_stream_fragment_alloc_context *ctx = context;
+ struct string_stream_fragment *frag;
+
+ frag = kunit_kzalloc(ctx->test, sizeof(*frag), ctx->gfp);
+ if (!frag)
+ return -ENOMEM;
+
+ frag->test = ctx->test;
+ frag->fragment = kunit_kmalloc(ctx->test, ctx->len, ctx->gfp);
+ if (!frag->fragment)
+ return -ENOMEM;
+
+ res->allocation = frag;
+
+ return 0;
+}
+
+static void string_stream_fragment_free(struct kunit_resource *res)
+{
+ struct string_stream_fragment *frag = res->allocation;
+
+ list_del(&frag->node);
+ kunit_kfree(frag->test, frag->fragment);
+ kunit_kfree(frag->test, frag);
+}
+
+static struct string_stream_fragment *alloc_string_stream_fragment(
+ struct kunit *test, int len, gfp_t gfp)
+{
+ struct string_stream_fragment_alloc_context context = {
+ .test = test,
+ .len = len,
+ .gfp = gfp
+ };
+
+ return kunit_alloc_resource(test,
+ string_stream_fragment_init,
+ string_stream_fragment_free,
+ gfp,
+ &context);
+}
+
+static int string_stream_fragment_destroy(struct string_stream_fragment *frag)
+{
+ return kunit_resource_destroy(frag->test,
+ kunit_resource_instance_match,
+ string_stream_fragment_free,
+ frag);
+}
+
+int string_stream_vadd(struct string_stream *stream,
+ const char *fmt,
+ va_list args)
+{
+ struct string_stream_fragment *frag_container;
+ int len;
+ va_list args_for_counting;
+
+ /* Make a copy because `vsnprintf` could change it */
+ va_copy(args_for_counting, args);
+
+ /* Need space for null byte. */
+ len = vsnprintf(NULL, 0, fmt, args_for_counting) + 1;
+
+ va_end(args_for_counting);
+
+ frag_container = alloc_string_stream_fragment(stream->test,
+ len,
+ stream->gfp);
+ if (!frag_container)
+ return -ENOMEM;
+
+ len = vsnprintf(frag_container->fragment, len, fmt, args);
+ spin_lock(&stream->lock);
+ stream->length += len;
+ list_add_tail(&frag_container->node, &stream->fragments);
+ spin_unlock(&stream->lock);
+
+ return 0;
+}
+
+int string_stream_add(struct string_stream *stream, const char *fmt, ...)
+{
+ va_list args;
+ int result;
+
+ va_start(args, fmt);
+ result = string_stream_vadd(stream, fmt, args);
+ va_end(args);
+
+ return result;
+}
+
+static void string_stream_clear(struct string_stream *stream)
+{
+ struct string_stream_fragment *frag_container, *frag_container_safe;
+
+ spin_lock(&stream->lock);
+ list_for_each_entry_safe(frag_container,
+ frag_container_safe,
+ &stream->fragments,
+ node) {
+ string_stream_fragment_destroy(frag_container);
+ }
+ stream->length = 0;
+ spin_unlock(&stream->lock);
+}
+
+char *string_stream_get_string(struct string_stream *stream)
+{
+ struct string_stream_fragment *frag_container;
+ size_t buf_len = stream->length + 1; /* +1 for null byte. */
+ char *buf;
+
+ buf = kunit_kzalloc(stream->test, buf_len, stream->gfp);
+ if (!buf)
+ return NULL;
+
+ spin_lock(&stream->lock);
+ list_for_each_entry(frag_container, &stream->fragments, node)
+ strlcat(buf, frag_container->fragment, buf_len);
+ spin_unlock(&stream->lock);
+
+ return buf;
+}
+
+int string_stream_append(struct string_stream *stream,
+ struct string_stream *other)
+{
+ const char *other_content;
+
+ other_content = string_stream_get_string(other);
+
+ if (!other_content)
+ return -ENOMEM;
+
+ return string_stream_add(stream, other_content);
+}
+
+bool string_stream_is_empty(struct string_stream *stream)
+{
+ return list_empty(&stream->fragments);
+}
+
+struct string_stream_alloc_context {
+ struct kunit *test;
+ gfp_t gfp;
+};
+
+static int string_stream_init(struct kunit_resource *res, void *context)
+{
+ struct string_stream *stream;
+ struct string_stream_alloc_context *ctx = context;
+
+ stream = kunit_kzalloc(ctx->test, sizeof(*stream), ctx->gfp);
+ if (!stream)
+ return -ENOMEM;
+
+ res->allocation = stream;
+ stream->gfp = ctx->gfp;
+ stream->test = ctx->test;
+ INIT_LIST_HEAD(&stream->fragments);
+ spin_lock_init(&stream->lock);
+
+ return 0;
+}
+
+static void string_stream_free(struct kunit_resource *res)
+{
+ struct string_stream *stream = res->allocation;
+
+ string_stream_clear(stream);
+}
+
+struct string_stream *alloc_string_stream(struct kunit *test, gfp_t gfp)
+{
+ struct string_stream_alloc_context context = {
+ .test = test,
+ .gfp = gfp
+ };
+
+ return kunit_alloc_resource(test,
+ string_stream_init,
+ string_stream_free,
+ gfp,
+ &context);
+}
+
+int string_stream_destroy(struct string_stream *stream)
+{
+ return kunit_resource_destroy(stream->test,
+ kunit_resource_instance_match,
+ string_stream_free,
+ stream);
+}
diff --git a/lib/kunit/test-test.c b/lib/kunit/test-test.c
new file mode 100644
index 000000000000..5ebe059d16e2
--- /dev/null
+++ b/lib/kunit/test-test.c
@@ -0,0 +1,331 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * KUnit test for core test infrastructure.
+ *
+ * Copyright (C) 2019, Google LLC.
+ * Author: Brendan Higgins <brendanhiggins@google.com>
+ */
+#include <kunit/test.h>
+
+struct kunit_try_catch_test_context {
+ struct kunit_try_catch *try_catch;
+ bool function_called;
+};
+
+static void kunit_test_successful_try(void *data)
+{
+ struct kunit *test = data;
+ struct kunit_try_catch_test_context *ctx = test->priv;
+
+ ctx->function_called = true;
+}
+
+static void kunit_test_no_catch(void *data)
+{
+ struct kunit *test = data;
+
+ KUNIT_FAIL(test, "Catch should not be called\n");
+}
+
+static void kunit_test_try_catch_successful_try_no_catch(struct kunit *test)
+{
+ struct kunit_try_catch_test_context *ctx = test->priv;
+ struct kunit_try_catch *try_catch = ctx->try_catch;
+
+ kunit_try_catch_init(try_catch,
+ test,
+ kunit_test_successful_try,
+ kunit_test_no_catch);
+ kunit_try_catch_run(try_catch, test);
+
+ KUNIT_EXPECT_TRUE(test, ctx->function_called);
+}
+
+static void kunit_test_unsuccessful_try(void *data)
+{
+ struct kunit *test = data;
+ struct kunit_try_catch_test_context *ctx = test->priv;
+ struct kunit_try_catch *try_catch = ctx->try_catch;
+
+ kunit_try_catch_throw(try_catch);
+ KUNIT_FAIL(test, "This line should never be reached\n");
+}
+
+static void kunit_test_catch(void *data)
+{
+ struct kunit *test = data;
+ struct kunit_try_catch_test_context *ctx = test->priv;
+
+ ctx->function_called = true;
+}
+
+static void kunit_test_try_catch_unsuccessful_try_does_catch(struct kunit *test)
+{
+ struct kunit_try_catch_test_context *ctx = test->priv;
+ struct kunit_try_catch *try_catch = ctx->try_catch;
+
+ kunit_try_catch_init(try_catch,
+ test,
+ kunit_test_unsuccessful_try,
+ kunit_test_catch);
+ kunit_try_catch_run(try_catch, test);
+
+ KUNIT_EXPECT_TRUE(test, ctx->function_called);
+}
+
+static int kunit_try_catch_test_init(struct kunit *test)
+{
+ struct kunit_try_catch_test_context *ctx;
+
+ ctx = kunit_kzalloc(test, sizeof(*ctx), GFP_KERNEL);
+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ctx);
+ test->priv = ctx;
+
+ ctx->try_catch = kunit_kmalloc(test,
+ sizeof(*ctx->try_catch),
+ GFP_KERNEL);
+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ctx->try_catch);
+
+ return 0;
+}
+
+static struct kunit_case kunit_try_catch_test_cases[] = {
+ KUNIT_CASE(kunit_test_try_catch_successful_try_no_catch),
+ KUNIT_CASE(kunit_test_try_catch_unsuccessful_try_does_catch),
+ {}
+};
+
+static struct kunit_suite kunit_try_catch_test_suite = {
+ .name = "kunit-try-catch-test",
+ .init = kunit_try_catch_test_init,
+ .test_cases = kunit_try_catch_test_cases,
+};
+kunit_test_suite(kunit_try_catch_test_suite);
+
+/*
+ * Context for testing test managed resources
+ * is_resource_initialized is used to test arbitrary resources
+ */
+struct kunit_test_resource_context {
+ struct kunit test;
+ bool is_resource_initialized;
+ int allocate_order[2];
+ int free_order[2];
+};
+
+static int fake_resource_init(struct kunit_resource *res, void *context)
+{
+ struct kunit_test_resource_context *ctx = context;
+
+ res->allocation = &ctx->is_resource_initialized;
+ ctx->is_resource_initialized = true;
+ return 0;
+}
+
+static void fake_resource_free(struct kunit_resource *res)
+{
+ bool *is_resource_initialized = res->allocation;
+
+ *is_resource_initialized = false;
+}
+
+static void kunit_resource_test_init_resources(struct kunit *test)
+{
+ struct kunit_test_resource_context *ctx = test->priv;
+
+ kunit_init_test(&ctx->test, "testing_test_init_test");
+
+ KUNIT_EXPECT_TRUE(test, list_empty(&ctx->test.resources));
+}
+
+static void kunit_resource_test_alloc_resource(struct kunit *test)
+{
+ struct kunit_test_resource_context *ctx = test->priv;
+ struct kunit_resource *res;
+ kunit_resource_free_t free = fake_resource_free;
+
+ res = kunit_alloc_and_get_resource(&ctx->test,
+ fake_resource_init,
+ fake_resource_free,
+ GFP_KERNEL,
+ ctx);
+
+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, res);
+ KUNIT_EXPECT_PTR_EQ(test,
+ &ctx->is_resource_initialized,
+ (bool *) res->allocation);
+ KUNIT_EXPECT_TRUE(test, list_is_last(&res->node, &ctx->test.resources));
+ KUNIT_EXPECT_PTR_EQ(test, free, res->free);
+}
+
+static void kunit_resource_test_destroy_resource(struct kunit *test)
+{
+ struct kunit_test_resource_context *ctx = test->priv;
+ struct kunit_resource *res = kunit_alloc_and_get_resource(
+ &ctx->test,
+ fake_resource_init,
+ fake_resource_free,
+ GFP_KERNEL,
+ ctx);
+
+ KUNIT_ASSERT_FALSE(test,
+ kunit_resource_destroy(&ctx->test,
+ kunit_resource_instance_match,
+ res->free,
+ res->allocation));
+
+ KUNIT_EXPECT_FALSE(test, ctx->is_resource_initialized);
+ KUNIT_EXPECT_TRUE(test, list_empty(&ctx->test.resources));
+}
+
+static void kunit_resource_test_cleanup_resources(struct kunit *test)
+{
+ int i;
+ struct kunit_test_resource_context *ctx = test->priv;
+ struct kunit_resource *resources[5];
+
+ for (i = 0; i < ARRAY_SIZE(resources); i++) {
+ resources[i] = kunit_alloc_and_get_resource(&ctx->test,
+ fake_resource_init,
+ fake_resource_free,
+ GFP_KERNEL,
+ ctx);
+ }
+
+ kunit_cleanup(&ctx->test);
+
+ KUNIT_EXPECT_TRUE(test, list_empty(&ctx->test.resources));
+}
+
+static void kunit_resource_test_mark_order(int order_array[],
+ size_t order_size,
+ int key)
+{
+ int i;
+
+ for (i = 0; i < order_size && order_array[i]; i++)
+ ;
+
+ order_array[i] = key;
+}
+
+#define KUNIT_RESOURCE_TEST_MARK_ORDER(ctx, order_field, key) \
+ kunit_resource_test_mark_order(ctx->order_field, \
+ ARRAY_SIZE(ctx->order_field), \
+ key)
+
+static int fake_resource_2_init(struct kunit_resource *res, void *context)
+{
+ struct kunit_test_resource_context *ctx = context;
+
+ KUNIT_RESOURCE_TEST_MARK_ORDER(ctx, allocate_order, 2);
+
+ res->allocation = ctx;
+
+ return 0;
+}
+
+static void fake_resource_2_free(struct kunit_resource *res)
+{
+ struct kunit_test_resource_context *ctx = res->allocation;
+
+ KUNIT_RESOURCE_TEST_MARK_ORDER(ctx, free_order, 2);
+}
+
+static int fake_resource_1_init(struct kunit_resource *res, void *context)
+{
+ struct kunit_test_resource_context *ctx = context;
+
+ kunit_alloc_and_get_resource(&ctx->test,
+ fake_resource_2_init,
+ fake_resource_2_free,
+ GFP_KERNEL,
+ ctx);
+
+ KUNIT_RESOURCE_TEST_MARK_ORDER(ctx, allocate_order, 1);
+
+ res->allocation = ctx;
+
+ return 0;
+}
+
+static void fake_resource_1_free(struct kunit_resource *res)
+{
+ struct kunit_test_resource_context *ctx = res->allocation;
+
+ KUNIT_RESOURCE_TEST_MARK_ORDER(ctx, free_order, 1);
+}
+
+/*
+ * TODO(brendanhiggins@google.com): replace the arrays that keep track of the
+ * order of allocation and freeing with strict mocks using the IN_SEQUENCE macro
+ * to assert allocation and freeing order when the feature becomes available.
+ */
+static void kunit_resource_test_proper_free_ordering(struct kunit *test)
+{
+ struct kunit_test_resource_context *ctx = test->priv;
+
+ /* fake_resource_1 allocates a fake_resource_2 in its init. */
+ kunit_alloc_and_get_resource(&ctx->test,
+ fake_resource_1_init,
+ fake_resource_1_free,
+ GFP_KERNEL,
+ ctx);
+
+ /*
+ * Since fake_resource_2_init calls KUNIT_RESOURCE_TEST_MARK_ORDER
+ * before returning to fake_resource_1_init, it should be the first to
+ * put its key in the allocate_order array.
+ */
+ KUNIT_EXPECT_EQ(test, ctx->allocate_order[0], 2);
+ KUNIT_EXPECT_EQ(test, ctx->allocate_order[1], 1);
+
+ kunit_cleanup(&ctx->test);
+
+ /*
+ * Because fake_resource_2 finishes allocation before fake_resource_1,
+ * fake_resource_1 should be freed first since it could depend on
+ * fake_resource_2.
+ */
+ KUNIT_EXPECT_EQ(test, ctx->free_order[0], 1);
+ KUNIT_EXPECT_EQ(test, ctx->free_order[1], 2);
+}
+
+static int kunit_resource_test_init(struct kunit *test)
+{
+ struct kunit_test_resource_context *ctx =
+ kzalloc(sizeof(*ctx), GFP_KERNEL);
+
+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ctx);
+
+ test->priv = ctx;
+
+ kunit_init_test(&ctx->test, "test_test_context");
+
+ return 0;
+}
+
+static void kunit_resource_test_exit(struct kunit *test)
+{
+ struct kunit_test_resource_context *ctx = test->priv;
+
+ kunit_cleanup(&ctx->test);
+ kfree(ctx);
+}
+
+static struct kunit_case kunit_resource_test_cases[] = {
+ KUNIT_CASE(kunit_resource_test_init_resources),
+ KUNIT_CASE(kunit_resource_test_alloc_resource),
+ KUNIT_CASE(kunit_resource_test_destroy_resource),
+ KUNIT_CASE(kunit_resource_test_cleanup_resources),
+ KUNIT_CASE(kunit_resource_test_proper_free_ordering),
+ {}
+};
+
+static struct kunit_suite kunit_resource_test_suite = {
+ .name = "kunit-resource-test",
+ .init = kunit_resource_test_init,
+ .exit = kunit_resource_test_exit,
+ .test_cases = kunit_resource_test_cases,
+};
+kunit_test_suite(kunit_resource_test_suite);
diff --git a/lib/kunit/test.c b/lib/kunit/test.c
new file mode 100644
index 000000000000..c83c0fa59cbd
--- /dev/null
+++ b/lib/kunit/test.c
@@ -0,0 +1,478 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Base unit test (KUnit) API.
+ *
+ * Copyright (C) 2019, Google LLC.
+ * Author: Brendan Higgins <brendanhiggins@google.com>
+ */
+
+#include <kunit/test.h>
+#include <kunit/try-catch.h>
+#include <linux/kernel.h>
+#include <linux/sched/debug.h>
+
+static void kunit_set_failure(struct kunit *test)
+{
+ WRITE_ONCE(test->success, false);
+}
+
+static void kunit_print_tap_version(void)
+{
+ static bool kunit_has_printed_tap_version;
+
+ if (!kunit_has_printed_tap_version) {
+ pr_info("TAP version 14\n");
+ kunit_has_printed_tap_version = true;
+ }
+}
+
+static size_t kunit_test_cases_len(struct kunit_case *test_cases)
+{
+ struct kunit_case *test_case;
+ size_t len = 0;
+
+ for (test_case = test_cases; test_case->run_case; test_case++)
+ len++;
+
+ return len;
+}
+
+static void kunit_print_subtest_start(struct kunit_suite *suite)
+{
+ kunit_print_tap_version();
+ pr_info("\t# Subtest: %s\n", suite->name);
+ pr_info("\t1..%zd\n", kunit_test_cases_len(suite->test_cases));
+}
+
+static void kunit_print_ok_not_ok(bool should_indent,
+ bool is_ok,
+ size_t test_number,
+ const char *description)
+{
+ const char *indent, *ok_not_ok;
+
+ if (should_indent)
+ indent = "\t";
+ else
+ indent = "";
+
+ if (is_ok)
+ ok_not_ok = "ok";
+ else
+ ok_not_ok = "not ok";
+
+ pr_info("%s%s %zd - %s\n", indent, ok_not_ok, test_number, description);
+}
+
+static bool kunit_suite_has_succeeded(struct kunit_suite *suite)
+{
+ const struct kunit_case *test_case;
+
+ for (test_case = suite->test_cases; test_case->run_case; test_case++)
+ if (!test_case->success)
+ return false;
+
+ return true;
+}
+
+static void kunit_print_subtest_end(struct kunit_suite *suite)
+{
+ static size_t kunit_suite_counter = 1;
+
+ kunit_print_ok_not_ok(false,
+ kunit_suite_has_succeeded(suite),
+ kunit_suite_counter++,
+ suite->name);
+}
+
+static void kunit_print_test_case_ok_not_ok(struct kunit_case *test_case,
+ size_t test_number)
+{
+ kunit_print_ok_not_ok(true,
+ test_case->success,
+ test_number,
+ test_case->name);
+}
+
+static void kunit_print_string_stream(struct kunit *test,
+ struct string_stream *stream)
+{
+ struct string_stream_fragment *fragment;
+ char *buf;
+
+ buf = string_stream_get_string(stream);
+ if (!buf) {
+ kunit_err(test,
+ "Could not allocate buffer, dumping stream:\n");
+ list_for_each_entry(fragment, &stream->fragments, node) {
+ kunit_err(test, "%s", fragment->fragment);
+ }
+ kunit_err(test, "\n");
+ } else {
+ kunit_err(test, "%s", buf);
+ kunit_kfree(test, buf);
+ }
+}
+
+static void kunit_fail(struct kunit *test, struct kunit_assert *assert)
+{
+ struct string_stream *stream;
+
+ kunit_set_failure(test);
+
+ stream = alloc_string_stream(test, GFP_KERNEL);
+ if (!stream) {
+ WARN(true,
+ "Could not allocate stream to print failed assertion in %s:%d\n",
+ assert->file,
+ assert->line);
+ return;
+ }
+
+ assert->format(assert, stream);
+
+ kunit_print_string_stream(test, stream);
+
+ WARN_ON(string_stream_destroy(stream));
+}
+
+static void __noreturn kunit_abort(struct kunit *test)
+{
+ kunit_try_catch_throw(&test->try_catch); /* Does not return. */
+
+ /*
+ * Throw could not abort from test.
+ *
+ * XXX: we should never reach this line! As kunit_try_catch_throw is
+ * marked __noreturn.
+ */
+ WARN_ONCE(true, "Throw could not abort from test!\n");
+}
+
+void kunit_do_assertion(struct kunit *test,
+ struct kunit_assert *assert,
+ bool pass,
+ const char *fmt, ...)
+{
+ va_list args;
+
+ if (pass)
+ return;
+
+ va_start(args, fmt);
+
+ assert->message.fmt = fmt;
+ assert->message.va = &args;
+
+ kunit_fail(test, assert);
+
+ va_end(args);
+
+ if (assert->type == KUNIT_ASSERTION)
+ kunit_abort(test);
+}
+
+void kunit_init_test(struct kunit *test, const char *name)
+{
+ spin_lock_init(&test->lock);
+ INIT_LIST_HEAD(&test->resources);
+ test->name = name;
+ test->success = true;
+}
+
+/*
+ * Initializes and runs test case. Does not clean up or do post validations.
+ */
+static void kunit_run_case_internal(struct kunit *test,
+ struct kunit_suite *suite,
+ struct kunit_case *test_case)
+{
+ if (suite->init) {
+ int ret;
+
+ ret = suite->init(test);
+ if (ret) {
+ kunit_err(test, "failed to initialize: %d\n", ret);
+ kunit_set_failure(test);
+ return;
+ }
+ }
+
+ test_case->run_case(test);
+}
+
+static void kunit_case_internal_cleanup(struct kunit *test)
+{
+ kunit_cleanup(test);
+}
+
+/*
+ * Performs post validations and cleanup after a test case was run.
+ * XXX: Should ONLY BE CALLED AFTER kunit_run_case_internal!
+ */
+static void kunit_run_case_cleanup(struct kunit *test,
+ struct kunit_suite *suite)
+{
+ if (suite->exit)
+ suite->exit(test);
+
+ kunit_case_internal_cleanup(test);
+}
+
+struct kunit_try_catch_context {
+ struct kunit *test;
+ struct kunit_suite *suite;
+ struct kunit_case *test_case;
+};
+
+static void kunit_try_run_case(void *data)
+{
+ struct kunit_try_catch_context *ctx = data;
+ struct kunit *test = ctx->test;
+ struct kunit_suite *suite = ctx->suite;
+ struct kunit_case *test_case = ctx->test_case;
+
+ /*
+ * kunit_run_case_internal may encounter a fatal error; if it does,
+ * abort will be called, this thread will exit, and finally the parent
+ * thread will resume control and handle any necessary clean up.
+ */
+ kunit_run_case_internal(test, suite, test_case);
+ /* This line may never be reached. */
+ kunit_run_case_cleanup(test, suite);
+}
+
+static void kunit_catch_run_case(void *data)
+{
+ struct kunit_try_catch_context *ctx = data;
+ struct kunit *test = ctx->test;
+ struct kunit_suite *suite = ctx->suite;
+ int try_exit_code = kunit_try_catch_get_result(&test->try_catch);
+
+ if (try_exit_code) {
+ kunit_set_failure(test);
+ /*
+ * Test case could not finish, we have no idea what state it is
+ * in, so don't do clean up.
+ */
+ if (try_exit_code == -ETIMEDOUT) {
+ kunit_err(test, "test case timed out\n");
+ /*
+ * Unknown internal error occurred preventing test case from
+ * running, so there is nothing to clean up.
+ */
+ } else {
+ kunit_err(test, "internal error occurred preventing test case from running: %d\n",
+ try_exit_code);
+ }
+ return;
+ }
+
+ /*
+ * Test case was run, but aborted. It is the test case's business as to
+ * whether it failed or not, we just need to clean up.
+ */
+ kunit_run_case_cleanup(test, suite);
+}
+
+/*
+ * Performs all logic to run a test case. It also catches most errors that
+ * occur in a test case and reports them as failures.
+ */
+static void kunit_run_case_catch_errors(struct kunit_suite *suite,
+ struct kunit_case *test_case)
+{
+ struct kunit_try_catch_context context;
+ struct kunit_try_catch *try_catch;
+ struct kunit test;
+
+ kunit_init_test(&test, test_case->name);
+ try_catch = &test.try_catch;
+
+ kunit_try_catch_init(try_catch,
+ &test,
+ kunit_try_run_case,
+ kunit_catch_run_case);
+ context.test = &test;
+ context.suite = suite;
+ context.test_case = test_case;
+ kunit_try_catch_run(try_catch, &context);
+
+ test_case->success = test.success;
+}
+
+int kunit_run_tests(struct kunit_suite *suite)
+{
+ struct kunit_case *test_case;
+ size_t test_case_count = 1;
+
+ kunit_print_subtest_start(suite);
+
+ for (test_case = suite->test_cases; test_case->run_case; test_case++) {
+ kunit_run_case_catch_errors(suite, test_case);
+ kunit_print_test_case_ok_not_ok(test_case, test_case_count++);
+ }
+
+ kunit_print_subtest_end(suite);
+
+ return 0;
+}
+
+struct kunit_resource *kunit_alloc_and_get_resource(struct kunit *test,
+ kunit_resource_init_t init,
+ kunit_resource_free_t free,
+ gfp_t internal_gfp,
+ void *context)
+{
+ struct kunit_resource *res;
+ int ret;
+
+ res = kzalloc(sizeof(*res), internal_gfp);
+ if (!res)
+ return NULL;
+
+ ret = init(res, context);
+ if (ret)
+ return NULL;
+
+ res->free = free;
+ spin_lock(&test->lock);
+ list_add_tail(&res->node, &test->resources);
+ spin_unlock(&test->lock);
+
+ return res;
+}
+
+static void kunit_resource_free(struct kunit *test, struct kunit_resource *res)
+{
+ res->free(res);
+ kfree(res);
+}
+
+static struct kunit_resource *kunit_resource_find(struct kunit *test,
+ kunit_resource_match_t match,
+ kunit_resource_free_t free,
+ void *match_data)
+{
+ struct kunit_resource *resource;
+
+ lockdep_assert_held(&test->lock);
+
+ list_for_each_entry_reverse(resource, &test->resources, node) {
+ if (resource->free != free)
+ continue;
+ if (match(test, resource->allocation, match_data))
+ return resource;
+ }
+
+ return NULL;
+}
+
+static struct kunit_resource *kunit_resource_remove(
+ struct kunit *test,
+ kunit_resource_match_t match,
+ kunit_resource_free_t free,
+ void *match_data)
+{
+ struct kunit_resource *resource;
+
+ spin_lock(&test->lock);
+ resource = kunit_resource_find(test, match, free, match_data);
+ if (resource)
+ list_del(&resource->node);
+ spin_unlock(&test->lock);
+
+ return resource;
+}
+
+int kunit_resource_destroy(struct kunit *test,
+ kunit_resource_match_t match,
+ kunit_resource_free_t free,
+ void *match_data)
+{
+ struct kunit_resource *resource;
+
+ resource = kunit_resource_remove(test, match, free, match_data);
+
+ if (!resource)
+ return -ENOENT;
+
+ kunit_resource_free(test, resource);
+ return 0;
+}
+
+struct kunit_kmalloc_params {
+ size_t size;
+ gfp_t gfp;
+};
+
+static int kunit_kmalloc_init(struct kunit_resource *res, void *context)
+{
+ struct kunit_kmalloc_params *params = context;
+
+ res->allocation = kmalloc(params->size, params->gfp);
+ if (!res->allocation)
+ return -ENOMEM;
+
+ return 0;
+}
+
+static void kunit_kmalloc_free(struct kunit_resource *res)
+{
+ kfree(res->allocation);
+}
+
+void *kunit_kmalloc(struct kunit *test, size_t size, gfp_t gfp)
+{
+ struct kunit_kmalloc_params params = {
+ .size = size,
+ .gfp = gfp
+ };
+
+ return kunit_alloc_resource(test,
+ kunit_kmalloc_init,
+ kunit_kmalloc_free,
+ gfp,
+ &params);
+}
+
+void kunit_kfree(struct kunit *test, const void *ptr)
+{
+ int rc;
+
+ rc = kunit_resource_destroy(test,
+ kunit_resource_instance_match,
+ kunit_kmalloc_free,
+ (void *)ptr);
+
+ WARN_ON(rc);
+}
+
+void kunit_cleanup(struct kunit *test)
+{
+ struct kunit_resource *resource;
+
+ /*
+ * test->resources is a stack - each allocation must be freed in the
+ * reverse order from which it was added since one resource may depend
+ * on another for its entire lifetime.
+ * Also, we cannot use the normal list_for_each constructs, even the
+ * safe ones because *arbitrary* nodes may be deleted when
+ * kunit_resource_free is called; the list_for_each_safe variants only
+ * protect against the current node being deleted, not the next.
+ */
+ while (true) {
+ spin_lock(&test->lock);
+ if (list_empty(&test->resources)) {
+ spin_unlock(&test->lock);
+ break;
+ }
+ resource = list_last_entry(&test->resources,
+ struct kunit_resource,
+ node);
+ list_del(&resource->node);
+ spin_unlock(&test->lock);
+
+ kunit_resource_free(test, resource);
+ }
+}
diff --git a/lib/kunit/try-catch.c b/lib/kunit/try-catch.c
new file mode 100644
index 000000000000..55686839eb61
--- /dev/null
+++ b/lib/kunit/try-catch.c
@@ -0,0 +1,118 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * An API to allow a function, that may fail, to be executed, and recover in a
+ * controlled manner.
+ *
+ * Copyright (C) 2019, Google LLC.
+ * Author: Brendan Higgins <brendanhiggins@google.com>
+ */
+
+#include <kunit/test.h>
+#include <kunit/try-catch.h>
+#include <linux/completion.h>
+#include <linux/kernel.h>
+#include <linux/kthread.h>
+#include <linux/sched/sysctl.h>
+
+void __noreturn kunit_try_catch_throw(struct kunit_try_catch *try_catch)
+{
+ try_catch->try_result = -EFAULT;
+ complete_and_exit(try_catch->try_completion, -EFAULT);
+}
+
+static int kunit_generic_run_threadfn_adapter(void *data)
+{
+ struct kunit_try_catch *try_catch = data;
+
+ try_catch->try(try_catch->context);
+
+ complete_and_exit(try_catch->try_completion, 0);
+}
+
+static unsigned long kunit_test_timeout(void)
+{
+ unsigned long timeout_msecs;
+
+ /*
+ * TODO(brendanhiggins@google.com): We should probably have some type of
+ * variable timeout here. The only question is what that timeout value
+ * should be.
+ *
+ * The intention has always been, at some point, to be able to label
+ * tests with some type of size bucket (unit/small, integration/medium,
+ * large/system/end-to-end, etc), where each size bucket would get a
+ * default timeout value kind of like what Bazel does:
+ * https://docs.bazel.build/versions/master/be/common-definitions.html#test.size
+ * There is still some debate to be had on exactly how we do this. (For
+ * one, we probably want to have some sort of test runner level
+ * timeout.)
+ *
+ * For more background on this topic, see:
+ * https://mike-bland.com/2011/11/01/small-medium-large.html
+ */
+ if (sysctl_hung_task_timeout_secs) {
+ /*
+ * If sysctl_hung_task is active, just set the timeout to some
+ * value less than that.
+ *
+ * In regards to the above TODO, if we decide on variable
+ * timeouts, this logic will likely need to change.
+ */
+ timeout_msecs = (sysctl_hung_task_timeout_secs - 1) *
+ MSEC_PER_SEC;
+ } else {
+ timeout_msecs = 300 * MSEC_PER_SEC; /* 5 min */
+ }
+
+ return timeout_msecs;
+}
+
+void kunit_try_catch_run(struct kunit_try_catch *try_catch, void *context)
+{
+ DECLARE_COMPLETION_ONSTACK(try_completion);
+ struct kunit *test = try_catch->test;
+ struct task_struct *task_struct;
+ int exit_code, time_remaining;
+
+ try_catch->context = context;
+ try_catch->try_completion = &try_completion;
+ try_catch->try_result = 0;
+ task_struct = kthread_run(kunit_generic_run_threadfn_adapter,
+ try_catch,
+ "kunit_try_catch_thread");
+ if (IS_ERR(task_struct)) {
+ try_catch->catch(try_catch->context);
+ return;
+ }
+
+ time_remaining = wait_for_completion_timeout(&try_completion,
+ kunit_test_timeout());
+ if (time_remaining == 0) {
+ kunit_err(test, "try timed out\n");
+ try_catch->try_result = -ETIMEDOUT;
+ }
+
+ exit_code = try_catch->try_result;
+
+ if (!exit_code)
+ return;
+
+ if (exit_code == -EFAULT)
+ try_catch->try_result = 0;
+ else if (exit_code == -EINTR)
+ kunit_err(test, "wake_up_process() was never called\n");
+ else if (exit_code)
+ kunit_err(test, "Unknown error: %d\n", exit_code);
+
+ try_catch->catch(try_catch->context);
+}
+
+void kunit_try_catch_init(struct kunit_try_catch *try_catch,
+ struct kunit *test,
+ kunit_try_catch_func_t try,
+ kunit_try_catch_func_t catch)
+{
+ try_catch->test = test;
+ try_catch->try = try;
+ try_catch->catch = catch;
+}