// SPDX-License-Identifier: GPL-2.0/* * Resctrl tests * * Copyright (C) 2018 Intel Corporation * * Authors: *    Sai Praneeth Prakhya <sai.praneeth.prakhya@intel.com>, *    Fenghua Yu <fenghua.yu@intel.com> */#include "resctrl.h" 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){	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 specified in the test list, ");	printf("e.g. -t mbm,mba,cmt,cat\n");	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");} void tests_cleanup(void){	mbm_test_cleanup();	mba_test_cleanup();	cmt_test_cleanup();	cat_test_cleanup();} static int test_prepare(void){	int res; 	res = signal_handler_register();	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(void){	umount_resctrlfs();	signal_handler_unregister();} static void run_mbm_test(const char * const *benchmark_cmd, int cpu_no){	int res; 	ksft_print_msg("Starting MBM BW change ...\n"); 	if (test_prepare()) {		ksft_exit_fail_msg("Abnormal failure when preparing for the test\n");		return;	} 	if (!validate_resctrl_feature_request("L3_MON", "mbm_total_bytes") ||	    !validate_resctrl_feature_request("L3_MON", "mbm_local_bytes") ||	    (get_vendor() != ARCH_INTEL)) {		ksft_test_result_skip("Hardware does not support MBM or MBM is disabled\n");		goto cleanup;	} 	res = mbm_bw_change(cpu_no, benchmark_cmd);	ksft_test_result(!res, "MBM: bw change\n");	if ((get_vendor() == ARCH_INTEL) && res)		ksft_print_msg("Intel MBM may be inaccurate when Sub-NUMA Clustering is enabled. Check BIOS configuration.\n"); cleanup:	test_cleanup();} static void run_mba_test(const char * const *benchmark_cmd, int cpu_no){	int res; 	ksft_print_msg("Starting MBA Schemata change ...\n"); 	if (test_prepare()) {		ksft_exit_fail_msg("Abnormal failure when preparing for the test\n");		return;	} 	if (!validate_resctrl_feature_request("MB", NULL) ||	    !validate_resctrl_feature_request("L3_MON", "mbm_local_bytes") ||	    (get_vendor() != ARCH_INTEL)) {		ksft_test_result_skip("Hardware does not support MBA or MBA is disabled\n");		goto cleanup;	} 	res = mba_schemata_change(cpu_no, benchmark_cmd);	ksft_test_result(!res, "MBA: schemata change\n"); cleanup:	test_cleanup();} static void run_cmt_test(const char * const *benchmark_cmd, int cpu_no){	int res; 	ksft_print_msg("Starting CMT test ...\n"); 	if (test_prepare()) {		ksft_exit_fail_msg("Abnormal failure when preparing for the test\n");		return;	} 	if (!validate_resctrl_feature_request("L3_MON", "llc_occupancy") ||	    !validate_resctrl_feature_request("L3", NULL)) {		ksft_test_result_skip("Hardware does not support CMT or CMT is disabled\n");		goto cleanup;	} 	res = cmt_resctrl_val(cpu_no, 5, benchmark_cmd);	ksft_test_result(!res, "CMT: test\n");	if ((get_vendor() == ARCH_INTEL) && res)		ksft_print_msg("Intel CMT may be inaccurate when Sub-NUMA Clustering is enabled. Check BIOS configuration.\n"); cleanup:	test_cleanup();} static void run_cat_test(int cpu_no, int no_of_bits){	int res; 	ksft_print_msg("Starting CAT test ...\n"); 	if (test_prepare()) {		ksft_exit_fail_msg("Abnormal failure when preparing for the test\n");		return;	} 	if (!validate_resctrl_feature_request("L3", NULL)) {		ksft_test_result_skip("Hardware does not support CAT or CAT is disabled\n");		goto cleanup;	} 	res = cat_perf_miss_val(cpu_no, no_of_bits, "L3");	ksft_test_result(!res, "CAT: test\n"); cleanup:	test_cleanup();} int main(int argc, char **argv){	bool mbm_test = true, mba_test = true, cmt_test = true;	const char *benchmark_cmd[BENCHMARK_ARGS] = {};	int c, cpu_no = 1, i, no_of_bits = 0;	char *span_str = NULL;	bool cat_test = true;	int tests = 0;	int ret; 	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++)				benchmark_cmd[i] = argv[i + optind];			benchmark_cmd[i] = NULL; 			goto last_arg;		case 't':			token = strtok(optarg, ","); 			mbm_test = false;			mba_test = false;			cmt_test = false;			cat_test = false;			while (token) {				if (!strncmp(token, MBM_STR, sizeof(MBM_STR))) {					mbm_test = true;					tests++;				} else if (!strncmp(token, MBA_STR, sizeof(MBA_STR))) {					mba_test = true;					tests++;				} else if (!strncmp(token, CMT_STR, sizeof(CMT_STR))) {					cmt_test = true;					tests++;				} else if (!strncmp(token, CAT_STR, sizeof(CAT_STR))) {					cat_test = true;					tests++;				} else {					printf("invalid argument\n"); 					return -1;				}				token = strtok(NULL, ",");			}			break;		case 'p':			cpu_no = atoi(optarg);			break;		case 'n':			no_of_bits = atoi(optarg);			if (no_of_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)		return ksft_exit_skip("Not running as root. Skipping...\n"); 	if (!check_resctrlfs_support())		return ksft_exit_skip("resctrl FS does not exist. Enable X86_CPU_RESCTRL config option.\n"); 	if (umount_resctrlfs())		return ksft_exit_skip("resctrl FS unmount failed.\n"); 	filter_dmesg(); 	if (!benchmark_cmd[0]) {		/* If no benchmark is given by "-b" argument, use fill_buf. */		benchmark_cmd[0] = "fill_buf";		ret = asprintf(&span_str, "%u", DEFAULT_SPAN);		if (ret < 0)			ksft_exit_fail_msg("Out of memory!\n");		benchmark_cmd[1] = span_str;		benchmark_cmd[2] = "1";		benchmark_cmd[3] = "0";		benchmark_cmd[4] = "false";		benchmark_cmd[5] = NULL;	} 	ksft_set_plan(tests ? : 4); 	if (mbm_test)		run_mbm_test(benchmark_cmd, cpu_no); 	if (mba_test)		run_mba_test(benchmark_cmd, cpu_no); 	if (cmt_test)		run_cmt_test(benchmark_cmd, cpu_no); 	if (cat_test)		run_cat_test(cpu_no, no_of_bits); 	free(span_str);	ksft_finished();}