344 lines
8.3 KiB
C
344 lines
8.3 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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/*
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* Resctrl tests
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*
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* Copyright (C) 2018 Intel Corporation
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*
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* Authors:
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* Sai Praneeth Prakhya <sai.praneeth.prakhya@intel.com>,
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* Fenghua Yu <fenghua.yu@intel.com>
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*/
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#include "resctrl.h"
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/* Volatile memory sink to prevent compiler optimizations */
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static volatile int sink_target;
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volatile int *value_sink = &sink_target;
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static struct resctrl_test *resctrl_tests[] = {
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&mbm_test,
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&mba_test,
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&cmt_test,
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&l3_cat_test,
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&l3_noncont_cat_test,
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&l2_noncont_cat_test,
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};
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static int detect_vendor(void)
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{
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FILE *inf = fopen("/proc/cpuinfo", "r");
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int vendor_id = 0;
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char *s = NULL;
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char *res;
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if (!inf)
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return vendor_id;
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res = fgrep(inf, "vendor_id");
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if (res)
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s = strchr(res, ':');
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if (s && !strcmp(s, ": GenuineIntel\n"))
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vendor_id = ARCH_INTEL;
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else if (s && !strcmp(s, ": AuthenticAMD\n"))
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vendor_id = ARCH_AMD;
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fclose(inf);
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free(res);
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return vendor_id;
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}
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int get_vendor(void)
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{
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static int vendor = -1;
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if (vendor == -1)
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vendor = detect_vendor();
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if (vendor == 0)
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ksft_print_msg("Can not get vendor info...\n");
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return vendor;
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}
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static void cmd_help(void)
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{
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int i;
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printf("usage: resctrl_tests [-h] [-t test list] [-n no_of_bits] [-b benchmark_cmd [option]...]\n");
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printf("\t-b benchmark_cmd [option]...: run specified benchmark for MBM, MBA and CMT\n");
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printf("\t default benchmark is builtin fill_buf\n");
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printf("\t-t test list: run tests/groups specified by the list, ");
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printf("e.g. -t mbm,mba,cmt,cat\n");
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printf("\t\tSupported tests (group):\n");
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for (i = 0; i < ARRAY_SIZE(resctrl_tests); i++) {
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if (resctrl_tests[i]->group)
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printf("\t\t\t%s (%s)\n", resctrl_tests[i]->name, resctrl_tests[i]->group);
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else
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printf("\t\t\t%s\n", resctrl_tests[i]->name);
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}
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printf("\t-n no_of_bits: run cache tests using specified no of bits in cache bit mask\n");
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printf("\t-p cpu_no: specify CPU number to run the test. 1 is default\n");
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printf("\t-h: help\n");
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}
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static int test_prepare(const struct resctrl_test *test)
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{
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int res;
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res = signal_handler_register(test);
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if (res) {
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ksft_print_msg("Failed to register signal handler\n");
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return res;
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}
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res = mount_resctrlfs();
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if (res) {
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signal_handler_unregister();
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ksft_print_msg("Failed to mount resctrl FS\n");
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return res;
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}
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return 0;
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}
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static void test_cleanup(const struct resctrl_test *test)
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{
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if (test->cleanup)
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test->cleanup();
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umount_resctrlfs();
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signal_handler_unregister();
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}
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static bool test_vendor_specific_check(const struct resctrl_test *test)
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{
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if (!test->vendor_specific)
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return true;
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return get_vendor() & test->vendor_specific;
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}
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static void run_single_test(const struct resctrl_test *test, const struct user_params *uparams)
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{
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int ret;
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if (test->disabled)
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return;
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if (!test_vendor_specific_check(test)) {
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ksft_test_result_skip("Hardware does not support %s\n", test->name);
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return;
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}
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ksft_print_msg("Starting %s test ...\n", test->name);
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if (test_prepare(test)) {
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ksft_exit_fail_msg("Abnormal failure when preparing for the test\n");
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return;
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}
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if (!test->feature_check(test)) {
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ksft_test_result_skip("Hardware does not support %s or %s is disabled\n",
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test->name, test->name);
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goto cleanup;
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}
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ret = test->run_test(test, uparams);
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ksft_test_result(!ret, "%s: test\n", test->name);
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cleanup:
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test_cleanup(test);
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}
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/*
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* Allocate and initialize a struct fill_buf_param with user provided
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* (via "-b fill_buf <fill_buf parameters>") parameters.
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*
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* Use defaults (that may not be appropriate for all tests) for any
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* fill_buf parameters omitted by the user.
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*
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* Historically it may have been possible for user space to provide
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* additional parameters, "operation" ("read" vs "write") in
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* benchmark_cmd[3] and "once" (run "once" or until terminated) in
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* benchmark_cmd[4]. Changing these parameters have never been
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* supported with the default of "read" operation and running until
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* terminated built into the tests. Any unsupported values for
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* (original) "fill_buf" parameters are treated as failure.
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*
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* Return: On failure, forcibly exits the test on any parsing failure,
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* returns NULL if no parsing needed (user did not actually provide
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* "-b fill_buf").
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* On success, returns pointer to newly allocated and fully
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* initialized struct fill_buf_param that caller must free.
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*/
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static struct fill_buf_param *alloc_fill_buf_param(struct user_params *uparams)
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{
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struct fill_buf_param *fill_param = NULL;
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char *endptr = NULL;
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if (!uparams->benchmark_cmd[0] || strcmp(uparams->benchmark_cmd[0], "fill_buf"))
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return NULL;
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fill_param = malloc(sizeof(*fill_param));
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if (!fill_param)
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ksft_exit_skip("Unable to allocate memory for fill_buf parameters.\n");
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if (uparams->benchmark_cmd[1] && *uparams->benchmark_cmd[1] != '\0') {
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errno = 0;
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fill_param->buf_size = strtoul(uparams->benchmark_cmd[1], &endptr, 10);
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if (errno || *endptr != '\0') {
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free(fill_param);
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ksft_exit_skip("Unable to parse benchmark buffer size.\n");
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}
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} else {
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fill_param->buf_size = MINIMUM_SPAN;
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}
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if (uparams->benchmark_cmd[2] && *uparams->benchmark_cmd[2] != '\0') {
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errno = 0;
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fill_param->memflush = strtol(uparams->benchmark_cmd[2], &endptr, 10) != 0;
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if (errno || *endptr != '\0') {
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free(fill_param);
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ksft_exit_skip("Unable to parse benchmark memflush parameter.\n");
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}
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} else {
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fill_param->memflush = true;
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}
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if (uparams->benchmark_cmd[3] && *uparams->benchmark_cmd[3] != '\0') {
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if (strcmp(uparams->benchmark_cmd[3], "0")) {
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free(fill_param);
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ksft_exit_skip("Only read operations supported.\n");
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}
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}
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if (uparams->benchmark_cmd[4] && *uparams->benchmark_cmd[4] != '\0') {
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if (strcmp(uparams->benchmark_cmd[4], "false")) {
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free(fill_param);
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ksft_exit_skip("fill_buf is required to run until termination.\n");
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}
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}
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return fill_param;
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}
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static void init_user_params(struct user_params *uparams)
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{
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memset(uparams, 0, sizeof(*uparams));
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uparams->cpu = 1;
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uparams->bits = 0;
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}
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int main(int argc, char **argv)
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{
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struct fill_buf_param *fill_param = NULL;
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int tests = ARRAY_SIZE(resctrl_tests);
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bool test_param_seen = false;
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struct user_params uparams;
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int c, i;
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init_user_params(&uparams);
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while ((c = getopt(argc, argv, "ht:b:n:p:")) != -1) {
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char *token;
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switch (c) {
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case 'b':
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/*
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* First move optind back to the (first) optarg and
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* then build the benchmark command using the
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* remaining arguments.
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*/
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optind--;
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if (argc - optind >= BENCHMARK_ARGS)
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ksft_exit_fail_msg("Too long benchmark command");
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/* Extract benchmark command from command line. */
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for (i = 0; i < argc - optind; i++)
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uparams.benchmark_cmd[i] = argv[i + optind];
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uparams.benchmark_cmd[i] = NULL;
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goto last_arg;
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case 't':
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token = strtok(optarg, ",");
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if (!test_param_seen) {
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for (i = 0; i < ARRAY_SIZE(resctrl_tests); i++)
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resctrl_tests[i]->disabled = true;
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tests = 0;
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test_param_seen = true;
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}
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while (token) {
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bool found = false;
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for (i = 0; i < ARRAY_SIZE(resctrl_tests); i++) {
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if (!strcasecmp(token, resctrl_tests[i]->name) ||
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(resctrl_tests[i]->group &&
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!strcasecmp(token, resctrl_tests[i]->group))) {
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if (resctrl_tests[i]->disabled)
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tests++;
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resctrl_tests[i]->disabled = false;
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found = true;
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}
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}
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if (!found) {
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printf("invalid test: %s\n", token);
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return -1;
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}
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token = strtok(NULL, ",");
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}
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break;
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case 'p':
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uparams.cpu = atoi(optarg);
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break;
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case 'n':
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uparams.bits = atoi(optarg);
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if (uparams.bits <= 0) {
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printf("Bail out! invalid argument for no_of_bits\n");
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return -1;
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}
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break;
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case 'h':
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cmd_help();
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return 0;
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default:
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printf("invalid argument\n");
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return -1;
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}
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}
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last_arg:
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fill_param = alloc_fill_buf_param(&uparams);
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if (fill_param)
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uparams.fill_buf = fill_param;
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ksft_print_header();
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/*
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* Typically we need root privileges, because:
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* 1. We write to resctrl FS
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* 2. We execute perf commands
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*/
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if (geteuid() != 0)
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ksft_exit_skip("Not running as root. Skipping...\n");
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if (!check_resctrlfs_support())
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ksft_exit_skip("resctrl FS does not exist. Enable X86_CPU_RESCTRL config option.\n");
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if (umount_resctrlfs())
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ksft_exit_skip("resctrl FS unmount failed.\n");
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filter_dmesg();
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ksft_set_plan(tests);
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for (i = 0; i < ARRAY_SIZE(resctrl_tests); i++)
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run_single_test(resctrl_tests[i], &uparams);
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free(fill_param);
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ksft_finished();
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}
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