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, size_t span, 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(span, 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 size_t span = 250 * MB; 181 bool cat_test = true; 182 183 for (i = 0; i < argc; i++) { 184 if (strcmp(argv[i], "-b") == 0) { 185 ben_ind = i + 1; 186 ben_count = argc - ben_ind; 187 argc_new = ben_ind - 1; 188 has_ben = true; 189 break; 190 } 191 } 192 193 while ((c = getopt(argc_new, argv, "ht:b:n:p:")) != -1) { 194 char *token; 195 196 switch (c) { 197 case 't': 198 token = strtok(optarg, ","); 199 200 mbm_test = false; 201 mba_test = false; 202 cmt_test = false; 203 cat_test = false; 204 while (token) { 205 if (!strncmp(token, MBM_STR, sizeof(MBM_STR))) { 206 mbm_test = true; 207 tests++; 208 } else if (!strncmp(token, MBA_STR, sizeof(MBA_STR))) { 209 mba_test = true; 210 tests++; 211 } else if (!strncmp(token, CMT_STR, sizeof(CMT_STR))) { 212 cmt_test = true; 213 tests++; 214 } else if (!strncmp(token, CAT_STR, sizeof(CAT_STR))) { 215 cat_test = true; 216 tests++; 217 } else { 218 printf("invalid argument\n"); 219 220 return -1; 221 } 222 token = strtok(NULL, ","); 223 } 224 break; 225 case 'p': 226 cpu_no = atoi(optarg); 227 break; 228 case 'n': 229 no_of_bits = atoi(optarg); 230 if (no_of_bits <= 0) { 231 printf("Bail out! invalid argument for no_of_bits\n"); 232 return -1; 233 } 234 break; 235 case 'h': 236 cmd_help(); 237 238 return 0; 239 default: 240 printf("invalid argument\n"); 241 242 return -1; 243 } 244 } 245 246 ksft_print_header(); 247 248 /* 249 * Typically we need root privileges, because: 250 * 1. We write to resctrl FS 251 * 2. We execute perf commands 252 */ 253 if (geteuid() != 0) 254 return ksft_exit_skip("Not running as root. Skipping...\n"); 255 256 if (has_ben) { 257 if (argc - ben_ind >= BENCHMARK_ARGS) 258 ksft_exit_fail_msg("Too long benchmark command.\n"); 259 260 /* Extract benchmark command from command line. */ 261 for (i = ben_ind; i < argc; i++) { 262 benchmark_cmd[i - ben_ind] = benchmark_cmd_area[i]; 263 if (strlen(argv[i]) >= BENCHMARK_ARG_SIZE) 264 ksft_exit_fail_msg("Too long benchmark command argument.\n"); 265 sprintf(benchmark_cmd[i - ben_ind], "%s", argv[i]); 266 } 267 benchmark_cmd[ben_count] = NULL; 268 } else { 269 /* If no benchmark is given by "-b" argument, use fill_buf. */ 270 for (i = 0; i < 5; i++) 271 benchmark_cmd[i] = benchmark_cmd_area[i]; 272 273 strcpy(benchmark_cmd[0], "fill_buf"); 274 sprintf(benchmark_cmd[1], "%zu", span); 275 strcpy(benchmark_cmd[2], "1"); 276 strcpy(benchmark_cmd[3], "0"); 277 strcpy(benchmark_cmd[4], "false"); 278 benchmark_cmd[5] = NULL; 279 } 280 281 if (!check_resctrlfs_support()) 282 return ksft_exit_skip("resctrl FS does not exist. Enable X86_CPU_RESCTRL config option.\n"); 283 284 if (umount_resctrlfs()) 285 return ksft_exit_skip("resctrl FS unmount failed.\n"); 286 287 filter_dmesg(); 288 289 ksft_set_plan(tests ? : 4); 290 291 if (mbm_test) 292 run_mbm_test(benchmark_cmd, span, cpu_no); 293 294 if (mba_test) 295 run_mba_test(benchmark_cmd, cpu_no); 296 297 if (cmt_test) 298 run_cmt_test(benchmark_cmd, cpu_no); 299 300 if (cat_test) 301 run_cat_test(cpu_no, no_of_bits); 302 303 ksft_finished(); 304 } 305