linux/lib/kunit/executor.c
Joe Fradley d20a6ba5e3 kunit: add kunit.enable to enable/disable KUnit test
This patch adds the kunit.enable module parameter that will need to be
set to true in addition to KUNIT being enabled for KUnit tests to run.
The default value is true giving backwards compatibility. However, for
the production+testing use case the new config option
KUNIT_DEFAULT_ENABLED can be set to N requiring the tester to opt-in
by passing kunit.enable=1 to the kernel.

Signed-off-by: Joe Fradley <joefradley@google.com>
Reviewed-by: David Gow <davidgow@google.com>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
2022-09-30 13:17:39 -06:00

227 lines
5.8 KiB
C

// SPDX-License-Identifier: GPL-2.0
#include <linux/reboot.h>
#include <kunit/test.h>
#include <linux/glob.h>
#include <linux/moduleparam.h>
/*
* These symbols point to the .kunit_test_suites section and are defined in
* include/asm-generic/vmlinux.lds.h, and consequently must be extern.
*/
extern struct kunit_suite * const __kunit_suites_start[];
extern struct kunit_suite * const __kunit_suites_end[];
#if IS_BUILTIN(CONFIG_KUNIT)
static char *filter_glob_param;
static char *action_param;
module_param_named(filter_glob, filter_glob_param, charp, 0);
MODULE_PARM_DESC(filter_glob,
"Filter which KUnit test suites/tests run at boot-time, e.g. list* or list*.*del_test");
module_param_named(action, action_param, charp, 0);
MODULE_PARM_DESC(action,
"Changes KUnit executor behavior, valid values are:\n"
"<none>: run the tests like normal\n"
"'list' to list test names instead of running them.\n");
/* glob_match() needs NULL terminated strings, so we need a copy of filter_glob_param. */
struct kunit_test_filter {
char *suite_glob;
char *test_glob;
};
/* Split "suite_glob.test_glob" into two. Assumes filter_glob is not empty. */
static void kunit_parse_filter_glob(struct kunit_test_filter *parsed,
const char *filter_glob)
{
const int len = strlen(filter_glob);
const char *period = strchr(filter_glob, '.');
if (!period) {
parsed->suite_glob = kzalloc(len + 1, GFP_KERNEL);
parsed->test_glob = NULL;
strcpy(parsed->suite_glob, filter_glob);
return;
}
parsed->suite_glob = kzalloc(period - filter_glob + 1, GFP_KERNEL);
parsed->test_glob = kzalloc(len - (period - filter_glob) + 1, GFP_KERNEL);
strncpy(parsed->suite_glob, filter_glob, period - filter_glob);
strncpy(parsed->test_glob, period + 1, len - (period - filter_glob));
}
/* Create a copy of suite with only tests that match test_glob. */
static struct kunit_suite *
kunit_filter_tests(const struct kunit_suite *const suite, const char *test_glob)
{
int n = 0;
struct kunit_case *filtered, *test_case;
struct kunit_suite *copy;
kunit_suite_for_each_test_case(suite, test_case) {
if (!test_glob || glob_match(test_glob, test_case->name))
++n;
}
if (n == 0)
return NULL;
copy = kmemdup(suite, sizeof(*copy), GFP_KERNEL);
if (!copy)
return ERR_PTR(-ENOMEM);
filtered = kcalloc(n + 1, sizeof(*filtered), GFP_KERNEL);
if (!filtered) {
kfree(copy);
return ERR_PTR(-ENOMEM);
}
n = 0;
kunit_suite_for_each_test_case(suite, test_case) {
if (!test_glob || glob_match(test_glob, test_case->name))
filtered[n++] = *test_case;
}
copy->test_cases = filtered;
return copy;
}
static char *kunit_shutdown;
core_param(kunit_shutdown, kunit_shutdown, charp, 0644);
/* Stores an array of suites, end points one past the end */
struct suite_set {
struct kunit_suite * const *start;
struct kunit_suite * const *end;
};
static void kunit_free_suite_set(struct suite_set suite_set)
{
struct kunit_suite * const *suites;
for (suites = suite_set.start; suites < suite_set.end; suites++)
kfree(*suites);
kfree(suite_set.start);
}
static struct suite_set kunit_filter_suites(const struct suite_set *suite_set,
const char *filter_glob,
int *err)
{
int i;
struct kunit_suite **copy, *filtered_suite;
struct suite_set filtered;
struct kunit_test_filter filter;
const size_t max = suite_set->end - suite_set->start;
copy = kmalloc_array(max, sizeof(*filtered.start), GFP_KERNEL);
filtered.start = copy;
if (!copy) { /* won't be able to run anything, return an empty set */
filtered.end = copy;
return filtered;
}
kunit_parse_filter_glob(&filter, filter_glob);
for (i = 0; &suite_set->start[i] != suite_set->end; i++) {
if (!glob_match(filter.suite_glob, suite_set->start[i]->name))
continue;
filtered_suite = kunit_filter_tests(suite_set->start[i], filter.test_glob);
if (IS_ERR(filtered_suite)) {
*err = PTR_ERR(filtered_suite);
return filtered;
}
if (!filtered_suite)
continue;
*copy++ = filtered_suite;
}
filtered.end = copy;
kfree(filter.suite_glob);
kfree(filter.test_glob);
return filtered;
}
static void kunit_handle_shutdown(void)
{
if (!kunit_shutdown)
return;
if (!strcmp(kunit_shutdown, "poweroff"))
kernel_power_off();
else if (!strcmp(kunit_shutdown, "halt"))
kernel_halt();
else if (!strcmp(kunit_shutdown, "reboot"))
kernel_restart(NULL);
}
static void kunit_exec_run_tests(struct suite_set *suite_set)
{
size_t num_suites = suite_set->end - suite_set->start;
pr_info("TAP version 14\n");
pr_info("1..%zu\n", num_suites);
__kunit_test_suites_init(suite_set->start, num_suites);
}
static void kunit_exec_list_tests(struct suite_set *suite_set)
{
struct kunit_suite * const *suites;
struct kunit_case *test_case;
/* Hack: print a tap header so kunit.py can find the start of KUnit output. */
pr_info("TAP version 14\n");
for (suites = suite_set->start; suites < suite_set->end; suites++)
kunit_suite_for_each_test_case((*suites), test_case) {
pr_info("%s.%s\n", (*suites)->name, test_case->name);
}
}
int kunit_run_all_tests(void)
{
struct suite_set suite_set = {__kunit_suites_start, __kunit_suites_end};
int err = 0;
if (!kunit_enabled()) {
pr_info("kunit: disabled\n");
goto out;
}
if (filter_glob_param) {
suite_set = kunit_filter_suites(&suite_set, filter_glob_param, &err);
if (err) {
pr_err("kunit executor: error filtering suites: %d\n", err);
goto out;
}
}
if (!action_param)
kunit_exec_run_tests(&suite_set);
else if (strcmp(action_param, "list") == 0)
kunit_exec_list_tests(&suite_set);
else
pr_err("kunit executor: unknown action '%s'\n", action_param);
if (filter_glob_param) { /* a copy was made of each suite */
kunit_free_suite_set(suite_set);
}
out:
kunit_handle_shutdown();
return err;
}
#if IS_BUILTIN(CONFIG_KUNIT_TEST)
#include "executor_test.c"
#endif
#endif /* IS_BUILTIN(CONFIG_KUNIT) */