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-rw-r--r--lib/kunit/test.c478
1 files changed, 478 insertions, 0 deletions
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);
+ }
+}
generated by cgit v1.2.3 (git 2.39.0) at 2024-11-28 13:20:32 +0300