1 // SPDX-License-Identifier: GPL-2.0
3 * Memory Bandwidth Monitoring (MBM) test
5 * Copyright (C) 2018 Intel Corporation
8 * Sai Praneeth Prakhya <sai.praneeth.prakhya@intel.com>,
9 * Fenghua Yu <fenghua.yu@intel.com>
13 #define RESULT_FILE_NAME "result_mbm"
18 show_bw_info(unsigned long *bw_imc, unsigned long *bw_resc, int span)
20 unsigned long avg_bw_imc = 0, avg_bw_resc = 0;
21 unsigned long sum_bw_imc = 0, sum_bw_resc = 0;
26 * Discard the first value which is inaccurate due to monitoring setup
29 for (runs = 1; runs < NUM_OF_RUNS ; runs++) {
30 sum_bw_imc += bw_imc[runs];
31 sum_bw_resc += bw_resc[runs];
34 avg_bw_imc = sum_bw_imc / 4;
35 avg_bw_resc = sum_bw_resc / 4;
36 avg_diff = avg_bw_resc - avg_bw_imc;
38 printf("%sok MBM: diff within %d%%\n",
39 labs(avg_diff) > MAX_DIFF ? "not " : "", MAX_DIFF);
41 printf("# avg_diff: %lu\n", labs(avg_diff));
42 printf("# Span (MB): %d\n", span);
43 printf("# avg_bw_imc: %lu\n", avg_bw_imc);
44 printf("# avg_bw_resc: %lu\n", avg_bw_resc);
47 static int check_results(int span)
49 unsigned long bw_imc[NUM_OF_RUNS], bw_resc[NUM_OF_RUNS];
50 char temp[1024], *token_array[8];
51 char output[] = RESULT_FILE_NAME;
55 printf("# Checking for pass/fail\n");
57 fp = fopen(output, "r");
65 while (fgets(temp, sizeof(temp), fp)) {
66 char *token = strtok(temp, ":\t");
70 token_array[i++] = token;
71 token = strtok(NULL, ":\t");
74 bw_resc[runs] = strtoul(token_array[5], NULL, 0);
75 bw_imc[runs] = strtoul(token_array[3], NULL, 0);
79 show_bw_info(bw_imc, bw_resc, span);
86 static int mbm_setup(int num, ...)
88 struct resctrl_val_param *p;
89 static int num_of_runs;
93 /* Run NUM_OF_RUNS times */
94 if (num_of_runs++ >= NUM_OF_RUNS)
98 p = va_arg(param, struct resctrl_val_param *);
101 /* Set up shemata with 100% allocation on the first run. */
102 if (num_of_runs == 0)
103 ret = write_schemata(p->ctrlgrp, "100", p->cpu_no,
109 void mbm_test_cleanup(void)
111 remove(RESULT_FILE_NAME);
114 int mbm_bw_change(int span, int cpu_no, char *bw_report, char **benchmark_cmd)
116 struct resctrl_val_param param = {
117 .resctrl_val = "mbm",
123 .filename = RESULT_FILE_NAME,
124 .bw_report = bw_report,
129 remove(RESULT_FILE_NAME);
131 if (!validate_resctrl_feature_request("mbm"))
134 ret = resctrl_val(benchmark_cmd, ¶m);
138 ret = check_results(span);