1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Resctrl tests 4 * 5 * Copyright (C) 2018 Intel Corporation 6 * 7 * Authors: 8 * Sai Praneeth Prakhya <sai.praneeth.prakhya@intel.com>, 9 * Fenghua Yu <fenghua.yu@intel.com> 10 */ 11 #include "resctrl.h" 12 13 #define BENCHMARK_ARGS 64 14 #define BENCHMARK_ARG_SIZE 64 15 16 static int detect_vendor(void) 17 { 18 FILE *inf = fopen("/proc/cpuinfo", "r"); 19 int vendor_id = 0; 20 char *s = NULL; 21 char *res; 22 23 if (!inf) 24 return vendor_id; 25 26 res = fgrep(inf, "vendor_id"); 27 28 if (res) 29 s = strchr(res, ':'); 30 31 if (s && !strcmp(s, ": GenuineIntel\n")) 32 vendor_id = ARCH_INTEL; 33 else if (s && !strcmp(s, ": AuthenticAMD\n")) 34 vendor_id = ARCH_AMD; 35 36 fclose(inf); 37 free(res); 38 return vendor_id; 39 } 40 41 int get_vendor(void) 42 { 43 static int vendor = -1; 44 45 if (vendor == -1) 46 vendor = detect_vendor(); 47 if (vendor == 0) 48 ksft_print_msg("Can not get vendor info...\n"); 49 50 return vendor; 51 } 52 53 static void cmd_help(void) 54 { 55 printf("usage: resctrl_tests [-h] [-b \"benchmark_cmd [options]\"] [-t test list] [-n no_of_bits]\n"); 56 printf("\t-b benchmark_cmd [options]: run specified benchmark for MBM, MBA and CMT\n"); 57 printf("\t default benchmark is builtin fill_buf\n"); 58 printf("\t-t test list: run tests specified in the test list, "); 59 printf("e.g. -t mbm,mba,cmt,cat\n"); 60 printf("\t-n no_of_bits: run cache tests using specified no of bits in cache bit mask\n"); 61 printf("\t-p cpu_no: specify CPU number to run the test. 1 is default\n"); 62 printf("\t-h: help\n"); 63 } 64 65 void tests_cleanup(void) 66 { 67 mbm_test_cleanup(); 68 mba_test_cleanup(); 69 cmt_test_cleanup(); 70 cat_test_cleanup(); 71 } 72 73 static void run_mbm_test(char **benchmark_cmd, size_t span, 74 int cpu_no, char *bw_report) 75 { 76 int res; 77 78 ksft_print_msg("Starting MBM BW change ...\n"); 79 80 res = mount_resctrlfs(); 81 if (res) { 82 ksft_exit_fail_msg("Failed to mount resctrl FS\n"); 83 return; 84 } 85 86 if (!validate_resctrl_feature_request(MBM_STR) || (get_vendor() != ARCH_INTEL)) { 87 ksft_test_result_skip("Hardware does not support MBM or MBM is disabled\n"); 88 goto umount; 89 } 90 91 res = mbm_bw_change(span, cpu_no, bw_report, benchmark_cmd); 92 ksft_test_result(!res, "MBM: bw change\n"); 93 if ((get_vendor() == ARCH_INTEL) && res) 94 ksft_print_msg("Intel MBM may be inaccurate when Sub-NUMA Clustering is enabled. Check BIOS configuration.\n"); 95 96 umount: 97 umount_resctrlfs(); 98 } 99 100 static void run_mba_test(char **benchmark_cmd, int cpu_no, char *bw_report) 101 { 102 int res; 103 104 ksft_print_msg("Starting MBA Schemata change ...\n"); 105 106 res = mount_resctrlfs(); 107 if (res) { 108 ksft_exit_fail_msg("Failed to mount resctrl FS\n"); 109 return; 110 } 111 112 if (!validate_resctrl_feature_request(MBA_STR) || (get_vendor() != ARCH_INTEL)) { 113 ksft_test_result_skip("Hardware does not support MBA or MBA is disabled\n"); 114 goto umount; 115 } 116 117 res = mba_schemata_change(cpu_no, bw_report, benchmark_cmd); 118 ksft_test_result(!res, "MBA: schemata change\n"); 119 120 umount: 121 umount_resctrlfs(); 122 } 123 124 static void run_cmt_test(char **benchmark_cmd, int cpu_no) 125 { 126 int res; 127 128 ksft_print_msg("Starting CMT test ...\n"); 129 130 res = mount_resctrlfs(); 131 if (res) { 132 ksft_exit_fail_msg("Failed to mount resctrl FS\n"); 133 return; 134 } 135 136 if (!validate_resctrl_feature_request(CMT_STR)) { 137 ksft_test_result_skip("Hardware does not support CMT or CMT is disabled\n"); 138 goto umount; 139 } 140 141 res = cmt_resctrl_val(cpu_no, 5, benchmark_cmd); 142 ksft_test_result(!res, "CMT: test\n"); 143 if ((get_vendor() == ARCH_INTEL) && res) 144 ksft_print_msg("Intel CMT may be inaccurate when Sub-NUMA Clustering is enabled. Check BIOS configuration.\n"); 145 146 umount: 147 umount_resctrlfs(); 148 } 149 150 static void run_cat_test(int cpu_no, int no_of_bits) 151 { 152 int res; 153 154 ksft_print_msg("Starting CAT test ...\n"); 155 156 res = mount_resctrlfs(); 157 if (res) { 158 ksft_exit_fail_msg("Failed to mount resctrl FS\n"); 159 return; 160 } 161 162 if (!validate_resctrl_feature_request(CAT_STR)) { 163 ksft_test_result_skip("Hardware does not support CAT or CAT is disabled\n"); 164 goto umount; 165 } 166 167 res = cat_perf_miss_val(cpu_no, no_of_bits, "L3"); 168 ksft_test_result(!res, "CAT: test\n"); 169 170 umount: 171 umount_resctrlfs(); 172 } 173 174 int main(int argc, char **argv) 175 { 176 bool has_ben = false, mbm_test = true, mba_test = true, cmt_test = true; 177 char *benchmark_cmd[BENCHMARK_ARGS], bw_report[64], bm_type[64]; 178 char benchmark_cmd_area[BENCHMARK_ARGS][BENCHMARK_ARG_SIZE]; 179 int c, cpu_no = 1, argc_new = argc, i, no_of_bits = 0; 180 int ben_ind, ben_count, tests = 0; 181 size_t span = 250 * MB; 182 bool cat_test = true; 183 184 for (i = 0; i < argc; i++) { 185 if (strcmp(argv[i], "-b") == 0) { 186 ben_ind = i + 1; 187 ben_count = argc - ben_ind; 188 argc_new = ben_ind - 1; 189 has_ben = true; 190 break; 191 } 192 } 193 194 while ((c = getopt(argc_new, argv, "ht:b:n:p:")) != -1) { 195 char *token; 196 197 switch (c) { 198 case 't': 199 token = strtok(optarg, ","); 200 201 mbm_test = false; 202 mba_test = false; 203 cmt_test = false; 204 cat_test = false; 205 while (token) { 206 if (!strncmp(token, MBM_STR, sizeof(MBM_STR))) { 207 mbm_test = true; 208 tests++; 209 } else if (!strncmp(token, MBA_STR, sizeof(MBA_STR))) { 210 mba_test = true; 211 tests++; 212 } else if (!strncmp(token, CMT_STR, sizeof(CMT_STR))) { 213 cmt_test = true; 214 tests++; 215 } else if (!strncmp(token, CAT_STR, sizeof(CAT_STR))) { 216 cat_test = true; 217 tests++; 218 } else { 219 printf("invalid argument\n"); 220 221 return -1; 222 } 223 token = strtok(NULL, ","); 224 } 225 break; 226 case 'p': 227 cpu_no = atoi(optarg); 228 break; 229 case 'n': 230 no_of_bits = atoi(optarg); 231 if (no_of_bits <= 0) { 232 printf("Bail out! invalid argument for no_of_bits\n"); 233 return -1; 234 } 235 break; 236 case 'h': 237 cmd_help(); 238 239 return 0; 240 default: 241 printf("invalid argument\n"); 242 243 return -1; 244 } 245 } 246 247 ksft_print_header(); 248 249 /* 250 * Typically we need root privileges, because: 251 * 1. We write to resctrl FS 252 * 2. We execute perf commands 253 */ 254 if (geteuid() != 0) 255 return ksft_exit_skip("Not running as root. Skipping...\n"); 256 257 if (has_ben) { 258 if (argc - ben_ind >= BENCHMARK_ARGS) 259 ksft_exit_fail_msg("Too long benchmark command.\n"); 260 261 /* Extract benchmark command from command line. */ 262 for (i = ben_ind; i < argc; i++) { 263 benchmark_cmd[i - ben_ind] = benchmark_cmd_area[i]; 264 if (strlen(argv[i]) >= BENCHMARK_ARG_SIZE) 265 ksft_exit_fail_msg("Too long benchmark command argument.\n"); 266 sprintf(benchmark_cmd[i - ben_ind], "%s", argv[i]); 267 } 268 benchmark_cmd[ben_count] = NULL; 269 } else { 270 /* If no benchmark is given by "-b" argument, use fill_buf. */ 271 for (i = 0; i < 5; i++) 272 benchmark_cmd[i] = benchmark_cmd_area[i]; 273 274 strcpy(benchmark_cmd[0], "fill_buf"); 275 sprintf(benchmark_cmd[1], "%zu", span); 276 strcpy(benchmark_cmd[2], "1"); 277 strcpy(benchmark_cmd[3], "0"); 278 strcpy(benchmark_cmd[4], "false"); 279 benchmark_cmd[5] = NULL; 280 } 281 282 sprintf(bw_report, "reads"); 283 sprintf(bm_type, "fill_buf"); 284 285 if (!check_resctrlfs_support()) 286 return ksft_exit_skip("resctrl FS does not exist. Enable X86_CPU_RESCTRL config option.\n"); 287 288 if (umount_resctrlfs()) 289 return ksft_exit_skip("resctrl FS unmount failed.\n"); 290 291 filter_dmesg(); 292 293 ksft_set_plan(tests ? : 4); 294 295 if (mbm_test) 296 run_mbm_test(benchmark_cmd, span, cpu_no, bw_report); 297 298 if (mba_test) 299 run_mba_test(benchmark_cmd, cpu_no, bw_report); 300 301 if (cmt_test) 302 run_cmt_test(benchmark_cmd, cpu_no); 303 304 if (cat_test) 305 run_cat_test(cpu_no, no_of_bits); 306 307 ksft_finished(); 308 } 309