blob: 7a6430a7fca0070e0aa5e305eeb662fc6425e683 [file] [log] [blame]
// 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 <linux/kernel.h>
#include <linux/sched/debug.h>
#include "debugfs.h"
#include "string-stream.h"
#include "try-catch-impl.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;
}
}
/*
* Append formatted message to log, size of which is limited to
* KUNIT_LOG_SIZE bytes (including null terminating byte).
*/
void kunit_log_append(char *log, const char *fmt, ...)
{
char line[KUNIT_LOG_SIZE];
va_list args;
int len_left;
if (!log)
return;
len_left = KUNIT_LOG_SIZE - strlen(log) - 1;
if (len_left <= 0)
return;
va_start(args, fmt);
vsnprintf(line, sizeof(line), fmt, args);
va_end(args);
strncat(log, line, len_left);
}
EXPORT_SYMBOL_GPL(kunit_log_append);
size_t kunit_suite_num_test_cases(struct kunit_suite *suite)
{
struct kunit_case *test_case;
size_t len = 0;
kunit_suite_for_each_test_case(suite, test_case)
len++;
return len;
}
EXPORT_SYMBOL_GPL(kunit_suite_num_test_cases);
static void kunit_print_subtest_start(struct kunit_suite *suite)
{
kunit_print_tap_version();
kunit_log(KERN_INFO, suite, KUNIT_SUBTEST_INDENT "# Subtest: %s",
suite->name);
kunit_log(KERN_INFO, suite, KUNIT_SUBTEST_INDENT "1..%zd",
kunit_suite_num_test_cases(suite));
}
static void kunit_print_ok_not_ok(void *test_or_suite,
bool is_test,
bool is_ok,
size_t test_number,
const char *description)
{
struct kunit_suite *suite = is_test ? NULL : test_or_suite;
struct kunit *test = is_test ? test_or_suite : NULL;
/*
* We do not log the test suite results as doing so would
* mean debugfs display would consist of the test suite
* description and status prior to individual test results.
* Hence directly printk the suite status, and we will
* separately seq_printf() the suite status for the debugfs
* representation.
*/
if (suite)
pr_info("%s %zd - %s",
kunit_status_to_string(is_ok),
test_number, description);
else
kunit_log(KERN_INFO, test, KUNIT_SUBTEST_INDENT "%s %zd - %s",
kunit_status_to_string(is_ok),
test_number, description);
}
bool kunit_suite_has_succeeded(struct kunit_suite *suite)
{
const struct kunit_case *test_case;
kunit_suite_for_each_test_case(suite, test_case) {
if (!test_case->success)
return false;
}
return true;
}
EXPORT_SYMBOL_GPL(kunit_suite_has_succeeded);
static void kunit_print_subtest_end(struct kunit_suite *suite)
{
static size_t kunit_suite_counter = 1;
kunit_print_ok_not_ok((void *)suite, false,
kunit_suite_has_succeeded(suite),
kunit_suite_counter++,
suite->name);
}
unsigned int kunit_test_case_num(struct kunit_suite *suite,
struct kunit_case *test_case)
{
struct kunit_case *tc;
unsigned int i = 1;
kunit_suite_for_each_test_case(suite, tc) {
if (tc == test_case)
return i;
i++;
}
return 0;
}
EXPORT_SYMBOL_GPL(kunit_test_case_num);
static void kunit_print_string_stream(struct kunit *test,
struct string_stream *stream)
{
struct string_stream_fragment *fragment;
char *buf;
if (string_stream_is_empty(stream))
return;
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);
}
EXPORT_SYMBOL_GPL(kunit_do_assertion);
void kunit_init_test(struct kunit *test, const char *name, char *log)
{
spin_lock_init(&test->lock);
INIT_LIST_HEAD(&test->resources);
test->name = name;
test->log = log;
if (test->log)
test->log[0] = '\0';
test->success = true;
}
EXPORT_SYMBOL_GPL(kunit_init_test);
/*
* 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, test_case->log);
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;
kunit_print_ok_not_ok(&test, true, test_case->success,
kunit_test_case_num(suite, test_case),
test_case->name);
}
int kunit_run_tests(struct kunit_suite *suite)
{
struct kunit_case *test_case;
kunit_print_subtest_start(suite);
kunit_suite_for_each_test_case(suite, test_case)
kunit_run_case_catch_errors(suite, test_case);
kunit_print_subtest_end(suite);
return 0;
}
EXPORT_SYMBOL_GPL(kunit_run_tests);
static void kunit_init_suite(struct kunit_suite *suite)
{
kunit_debugfs_create_suite(suite);
}
int __kunit_test_suites_init(struct kunit_suite **suites)
{
unsigned int i;
for (i = 0; suites[i] != NULL; i++) {
kunit_init_suite(suites[i]);
kunit_run_tests(suites[i]);
}
return 0;
}
EXPORT_SYMBOL_GPL(__kunit_test_suites_init);
static void kunit_exit_suite(struct kunit_suite *suite)
{
kunit_debugfs_destroy_suite(suite);
}
void __kunit_test_suites_exit(struct kunit_suite **suites)
{
unsigned int i;
for (i = 0; suites[i] != NULL; i++)
kunit_exit_suite(suites[i]);
}
EXPORT_SYMBOL_GPL(__kunit_test_suites_exit);
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;
}
EXPORT_SYMBOL_GPL(kunit_alloc_and_get_resource);
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;
}
EXPORT_SYMBOL_GPL(kunit_resource_destroy);
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);
}
EXPORT_SYMBOL_GPL(kunit_kmalloc);
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);
}
EXPORT_SYMBOL_GPL(kunit_kfree);
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);
}
}
EXPORT_SYMBOL_GPL(kunit_cleanup);
static int __init kunit_init(void)
{
kunit_debugfs_init();
return 0;
}
late_initcall(kunit_init);
static void __exit kunit_exit(void)
{
kunit_debugfs_cleanup();
}
module_exit(kunit_exit);
MODULE_LICENSE("GPL v2");