// SPDX-License-Identifier: GPL-2.0
/*
* Resctrl tests
*
* Copyright (C) 2018 Intel Corporation
*
* Authors:
* Sai Praneeth Prakhya <[email protected]>,
* Fenghua Yu <[email protected]>
*/
#include "resctrl.h"
/* Volatile memory sink to prevent compiler optimizations */
static volatile int sink_target;
volatile int *value_sink = &sink_target;
static struct resctrl_test *resctrl_tests[] = {
&mbm_test,
&mba_test,
&cmt_test,
&l3_cat_test,
&l3_noncont_cat_test,
&l2_noncont_cat_test,
};
static int detect_vendor(void)
{
FILE *inf = fopen("/proc/cpuinfo", "r");
int vendor_id = 0;
char *s = NULL;
char *res;
if (!inf)
return vendor_id;
res = fgrep(inf, "vendor_id");
if (res)
s = strchr(res, ':');
if (s && !strcmp(s, ": GenuineIntel\n"))
vendor_id = ARCH_INTEL;
else if (s && !strcmp(s, ": AuthenticAMD\n"))
vendor_id = ARCH_AMD;
fclose(inf);
free(res);
return vendor_id;
}
int get_vendor(void)
{
static int vendor = -1;
if (vendor == -1)
vendor = detect_vendor();
if (vendor == 0)
ksft_print_msg("Can not get vendor info...\n");
return vendor;
}
static void cmd_help(void)
{
int i;
printf("usage: resctrl_tests [-h] [-t test list] [-n no_of_bits] [-b benchmark_cmd [option]...]\n");
printf("\t-b benchmark_cmd [option]...: run specified benchmark for MBM, MBA and CMT\n");
printf("\t default benchmark is builtin fill_buf\n");
printf("\t-t test list: run tests/groups specified by the list, ");
printf("e.g. -t mbm,mba,cmt,cat\n");
printf("\t\tSupported tests (group):\n");
for (i = 0; i < ARRAY_SIZE(resctrl_tests); i++) {
if (resctrl_tests[i]->group)
printf("\t\t\t%s (%s)\n", resctrl_tests[i]->name, resctrl_tests[i]->group);
else
printf("\t\t\t%s\n", resctrl_tests[i]->name);
}
printf("\t-n no_of_bits: run cache tests using specified no of bits in cache bit mask\n");
printf("\t-p cpu_no: specify CPU number to run the test. 1 is default\n");
printf("\t-h: help\n");
}
static int test_prepare(const struct resctrl_test *test)
{
int res;
res = signal_handler_register(test);
if (res) {
ksft_print_msg("Failed to register signal handler\n");
return res;
}
res = mount_resctrlfs();
if (res) {
signal_handler_unregister();
ksft_print_msg("Failed to mount resctrl FS\n");
return res;
}
return 0;
}
static void test_cleanup(const struct resctrl_test *test)
{
if (test->cleanup)
test->cleanup();
umount_resctrlfs();
signal_handler_unregister();
}
static bool test_vendor_specific_check(const struct resctrl_test *test)
{
if (!test->vendor_specific)
return true;
return get_vendor() & test->vendor_specific;
}
static void run_single_test(const struct resctrl_test *test, const struct user_params *uparams)
{
int ret;
if (test->disabled)
return;
if (!test_vendor_specific_check(test)) {
ksft_test_result_skip("Hardware does not support %s\n", test->name);
return;
}
ksft_print_msg("Starting %s test ...\n", test->name);
if (test_prepare(test)) {
ksft_exit_fail_msg("Abnormal failure when preparing for the test\n");
return;
}
if (!test->feature_check(test)) {
ksft_test_result_skip("Hardware does not support %s or %s is disabled\n",
test->name, test->name);
goto cleanup;
}
ret = test->run_test(test, uparams);
ksft_test_result(!ret, "%s: test\n", test->name);
cleanup:
test_cleanup(test);
}
static void init_user_params(struct user_params *uparams)
{
memset(uparams, 0, sizeof(*uparams));
uparams->cpu = 1;
uparams->bits = 0;
}
int main(int argc, char **argv)
{
int tests = ARRAY_SIZE(resctrl_tests);
bool test_param_seen = false;
struct user_params uparams;
char *span_str = NULL;
int ret, c, i;
init_user_params(&uparams);
while ((c = getopt(argc, argv, "ht:b:n:p:")) != -1) {
char *token;
switch (c) {
case 'b':
/*
* First move optind back to the (first) optarg and
* then build the benchmark command using the
* remaining arguments.
*/
optind--;
if (argc - optind >= BENCHMARK_ARGS)
ksft_exit_fail_msg("Too long benchmark command");
/* Extract benchmark command from command line. */
for (i = 0; i < argc - optind; i++)
uparams.benchmark_cmd[i] = argv[i + optind];
uparams.benchmark_cmd[i] = NULL;
goto last_arg;
case 't':
token = strtok(optarg, ",");
if (!test_param_seen) {
for (i = 0; i < ARRAY_SIZE(resctrl_tests); i++)
resctrl_tests[i]->disabled = true;
tests = 0;
test_param_seen = true;
}
while (token) {
bool found = false;
for (i = 0; i < ARRAY_SIZE(resctrl_tests); i++) {
if (!strcasecmp(token, resctrl_tests[i]->name) ||
(resctrl_tests[i]->group &&
!strcasecmp(token, resctrl_tests[i]->group))) {
if (resctrl_tests[i]->disabled)
tests++;
resctrl_tests[i]->disabled = false;
found = true;
}
}
if (!found) {
printf("invalid test: %s\n", token);
return -1;
}
token = strtok(NULL, ",");
}
break;
case 'p':
uparams.cpu = atoi(optarg);
break;
case 'n':
uparams.bits = atoi(optarg);
if (uparams.bits <= 0) {
printf("Bail out! invalid argument for no_of_bits\n");
return -1;
}
break;
case 'h':
cmd_help();
return 0;
default:
printf("invalid argument\n");
return -1;
}
}
last_arg:
ksft_print_header();
/*
* Typically we need root privileges, because:
* 1. We write to resctrl FS
* 2. We execute perf commands
*/
if (geteuid() != 0)
ksft_exit_skip("Not running as root. Skipping...\n");
if (!check_resctrlfs_support())
ksft_exit_skip("resctrl FS does not exist. Enable X86_CPU_RESCTRL config option.\n");
if (umount_resctrlfs())
ksft_exit_skip("resctrl FS unmount failed.\n");
filter_dmesg();
if (!uparams.benchmark_cmd[0]) {
/* If no benchmark is given by "-b" argument, use fill_buf. */
uparams.benchmark_cmd[0] = "fill_buf";
ret = asprintf(&span_str, "%u", DEFAULT_SPAN);
if (ret < 0)
ksft_exit_fail_msg("Out of memory!\n");
uparams.benchmark_cmd[1] = span_str;
uparams.benchmark_cmd[2] = "1";
uparams.benchmark_cmd[3] = "0";
uparams.benchmark_cmd[4] = "false";
uparams.benchmark_cmd[5] = NULL;
}
ksft_set_plan(tests);
for (i = 0; i < ARRAY_SIZE(resctrl_tests); i++)
run_single_test(resctrl_tests[i], &uparams);
free(span_str);
ksft_finished();
}
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