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
detect_vendor(void)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
get_vendor(void)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
cmd_help(void)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
tests_cleanup(void)65 void tests_cleanup(void)
66 {
67 mbm_test_cleanup();
68 mba_test_cleanup();
69 cmt_test_cleanup();
70 cat_test_cleanup();
71 }
72
run_mbm_test(char ** benchmark_cmd,size_t span,int cpu_no,char * bw_report)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
run_mba_test(char ** benchmark_cmd,int cpu_no,char * bw_report)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
run_cmt_test(char ** benchmark_cmd,int cpu_no)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
run_cat_test(int cpu_no,int no_of_bits)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
main(int argc,char ** argv)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 /* Extract benchmark command from command line. */
259 for (i = ben_ind; i < argc; i++) {
260 benchmark_cmd[i - ben_ind] = benchmark_cmd_area[i];
261 sprintf(benchmark_cmd[i - ben_ind], "%s", argv[i]);
262 }
263 benchmark_cmd[ben_count] = NULL;
264 } else {
265 /* If no benchmark is given by "-b" argument, use fill_buf. */
266 for (i = 0; i < 5; i++)
267 benchmark_cmd[i] = benchmark_cmd_area[i];
268
269 strcpy(benchmark_cmd[0], "fill_buf");
270 sprintf(benchmark_cmd[1], "%zu", span);
271 strcpy(benchmark_cmd[2], "1");
272 strcpy(benchmark_cmd[3], "0");
273 strcpy(benchmark_cmd[4], "false");
274 benchmark_cmd[5] = NULL;
275 }
276
277 sprintf(bw_report, "reads");
278 sprintf(bm_type, "fill_buf");
279
280 if (!check_resctrlfs_support())
281 return ksft_exit_skip("resctrl FS does not exist. Enable X86_CPU_RESCTRL config option.\n");
282
283 if (umount_resctrlfs())
284 return ksft_exit_skip("resctrl FS unmount failed.\n");
285
286 filter_dmesg();
287
288 ksft_set_plan(tests ? : 4);
289
290 if (mbm_test)
291 run_mbm_test(benchmark_cmd, span, cpu_no, bw_report);
292
293 if (mba_test)
294 run_mba_test(benchmark_cmd, cpu_no, bw_report);
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
