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 <[email protected]>, 9 * Fenghua Yu <[email protected]> 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] [-t test list] [-n no_of_bits] [-b benchmark_cmd [option]...]\n"); 56 printf("\t-b benchmark_cmd [option]...: 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, int cpu_no) 74 { 75 int res; 76 77 ksft_print_msg("Starting MBM BW change ...\n"); 78 79 res = mount_resctrlfs(); 80 if (res) { 81 ksft_exit_fail_msg("Failed to mount resctrl FS\n"); 82 return; 83 } 84 85 if (!validate_resctrl_feature_request(MBM_STR) || (get_vendor() != ARCH_INTEL)) { 86 ksft_test_result_skip("Hardware does not support MBM or MBM is disabled\n"); 87 goto umount; 88 } 89 90 res = mbm_bw_change(cpu_no, benchmark_cmd); 91 ksft_test_result(!res, "MBM: bw change\n"); 92 if ((get_vendor() == ARCH_INTEL) && res) 93 ksft_print_msg("Intel MBM may be inaccurate when Sub-NUMA Clustering is enabled. Check BIOS configuration.\n"); 94 95 umount: 96 umount_resctrlfs(); 97 } 98 99 static void run_mba_test(char **benchmark_cmd, int cpu_no) 100 { 101 int res; 102 103 ksft_print_msg("Starting MBA Schemata change ...\n"); 104 105 res = mount_resctrlfs(); 106 if (res) { 107 ksft_exit_fail_msg("Failed to mount resctrl FS\n"); 108 return; 109 } 110 111 if (!validate_resctrl_feature_request(MBA_STR) || (get_vendor() != ARCH_INTEL)) { 112 ksft_test_result_skip("Hardware does not support MBA or MBA is disabled\n"); 113 goto umount; 114 } 115 116 res = mba_schemata_change(cpu_no, benchmark_cmd); 117 ksft_test_result(!res, "MBA: schemata change\n"); 118 119 umount: 120 umount_resctrlfs(); 121 } 122 123 static void run_cmt_test(char **benchmark_cmd, int cpu_no) 124 { 125 int res; 126 127 ksft_print_msg("Starting CMT test ...\n"); 128 129 res = mount_resctrlfs(); 130 if (res) { 131 ksft_exit_fail_msg("Failed to mount resctrl FS\n"); 132 return; 133 } 134 135 if (!validate_resctrl_feature_request(CMT_STR)) { 136 ksft_test_result_skip("Hardware does not support CMT or CMT is disabled\n"); 137 goto umount; 138 } 139 140 res = cmt_resctrl_val(cpu_no, 5, benchmark_cmd); 141 ksft_test_result(!res, "CMT: test\n"); 142 if ((get_vendor() == ARCH_INTEL) && res) 143 ksft_print_msg("Intel CMT may be inaccurate when Sub-NUMA Clustering is enabled. Check BIOS configuration.\n"); 144 145 umount: 146 umount_resctrlfs(); 147 } 148 149 static void run_cat_test(int cpu_no, int no_of_bits) 150 { 151 int res; 152 153 ksft_print_msg("Starting CAT test ...\n"); 154 155 res = mount_resctrlfs(); 156 if (res) { 157 ksft_exit_fail_msg("Failed to mount resctrl FS\n"); 158 return; 159 } 160 161 if (!validate_resctrl_feature_request(CAT_STR)) { 162 ksft_test_result_skip("Hardware does not support CAT or CAT is disabled\n"); 163 goto umount; 164 } 165 166 res = cat_perf_miss_val(cpu_no, no_of_bits, "L3"); 167 ksft_test_result(!res, "CAT: test\n"); 168 169 umount: 170 umount_resctrlfs(); 171 } 172 173 int main(int argc, char **argv) 174 { 175 bool has_ben = false, mbm_test = true, mba_test = true, cmt_test = true; 176 char benchmark_cmd_area[BENCHMARK_ARGS][BENCHMARK_ARG_SIZE]; 177 int c, cpu_no = 1, argc_new = argc, i, no_of_bits = 0; 178 char *benchmark_cmd[BENCHMARK_ARGS]; 179 int ben_ind, ben_count, tests = 0; 180 bool cat_test = true; 181 182 for (i = 0; i < argc; i++) { 183 if (strcmp(argv[i], "-b") == 0) { 184 ben_ind = i + 1; 185 ben_count = argc - ben_ind; 186 argc_new = ben_ind - 1; 187 has_ben = true; 188 break; 189 } 190 } 191 192 while ((c = getopt(argc_new, argv, "ht:b:n:p:")) != -1) { 193 char *token; 194 195 switch (c) { 196 case 't': 197 token = strtok(optarg, ","); 198 199 mbm_test = false; 200 mba_test = false; 201 cmt_test = false; 202 cat_test = false; 203 while (token) { 204 if (!strncmp(token, MBM_STR, sizeof(MBM_STR))) { 205 mbm_test = true; 206 tests++; 207 } else if (!strncmp(token, MBA_STR, sizeof(MBA_STR))) { 208 mba_test = true; 209 tests++; 210 } else if (!strncmp(token, CMT_STR, sizeof(CMT_STR))) { 211 cmt_test = true; 212 tests++; 213 } else if (!strncmp(token, CAT_STR, sizeof(CAT_STR))) { 214 cat_test = true; 215 tests++; 216 } else { 217 printf("invalid argument\n"); 218 219 return -1; 220 } 221 token = strtok(NULL, ","); 222 } 223 break; 224 case 'p': 225 cpu_no = atoi(optarg); 226 break; 227 case 'n': 228 no_of_bits = atoi(optarg); 229 if (no_of_bits <= 0) { 230 printf("Bail out! invalid argument for no_of_bits\n"); 231 return -1; 232 } 233 break; 234 case 'h': 235 cmd_help(); 236 237 return 0; 238 default: 239 printf("invalid argument\n"); 240 241 return -1; 242 } 243 } 244 245 ksft_print_header(); 246 247 /* 248 * Typically we need root privileges, because: 249 * 1. We write to resctrl FS 250 * 2. We execute perf commands 251 */ 252 if (geteuid() != 0) 253 return ksft_exit_skip("Not running as root. Skipping...\n"); 254 255 if (!check_resctrlfs_support()) 256 return ksft_exit_skip("resctrl FS does not exist. Enable X86_CPU_RESCTRL config option.\n"); 257 258 if (umount_resctrlfs()) 259 return ksft_exit_skip("resctrl FS unmount failed.\n"); 260 261 filter_dmesg(); 262 263 if (has_ben) { 264 if (argc - ben_ind >= BENCHMARK_ARGS) 265 ksft_exit_fail_msg("Too long benchmark command.\n"); 266 267 /* Extract benchmark command from command line. */ 268 for (i = ben_ind; i < argc; i++) { 269 benchmark_cmd[i - ben_ind] = benchmark_cmd_area[i]; 270 if (strlen(argv[i]) >= BENCHMARK_ARG_SIZE) 271 ksft_exit_fail_msg("Too long benchmark command argument.\n"); 272 sprintf(benchmark_cmd[i - ben_ind], "%s", argv[i]); 273 } 274 benchmark_cmd[ben_count] = NULL; 275 } else { 276 /* If no benchmark is given by "-b" argument, use fill_buf. */ 277 for (i = 0; i < 5; i++) 278 benchmark_cmd[i] = benchmark_cmd_area[i]; 279 280 strcpy(benchmark_cmd[0], "fill_buf"); 281 sprintf(benchmark_cmd[1], "%u", DEFAULT_SPAN); 282 strcpy(benchmark_cmd[2], "1"); 283 strcpy(benchmark_cmd[3], "0"); 284 strcpy(benchmark_cmd[4], "false"); 285 benchmark_cmd[5] = NULL; 286 } 287 288 ksft_set_plan(tests ? : 4); 289 290 if (mbm_test) 291 run_mbm_test(benchmark_cmd, cpu_no); 292 293 if (mba_test) 294 run_mba_test(benchmark_cmd, cpu_no); 295 296 if (cmt_test) 297 run_cmt_test(benchmark_cmd, cpu_no); 298 299 if (cat_test) 300 run_cat_test(cpu_no, no_of_bits); 301 302 ksft_finished(); 303 } 304