1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Memory Bandwidth Allocation (MBA) test 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 RESULT_FILE_NAME "result_mba" 14 #define NUM_OF_RUNS 5 15 #define MAX_DIFF_PERCENT 5 16 #define ALLOCATION_MAX 100 17 #define ALLOCATION_MIN 10 18 #define ALLOCATION_STEP 10 19 20 /* 21 * Change schemata percentage from 100 to 10%. Write schemata to specified 22 * con_mon grp, mon_grp in resctrl FS. 23 * For each allocation, run 5 times in order to get average values. 24 */ 25 static int mba_setup(int num, ...) 26 { 27 static int runs_per_allocation, allocation = 100; 28 struct resctrl_val_param *p; 29 char allocation_str[64]; 30 va_list param; 31 int ret; 32 33 va_start(param, num); 34 p = va_arg(param, struct resctrl_val_param *); 35 va_end(param); 36 37 if (runs_per_allocation >= NUM_OF_RUNS) 38 runs_per_allocation = 0; 39 40 /* Only set up schemata once every NUM_OF_RUNS of allocations */ 41 if (runs_per_allocation++ != 0) 42 return 0; 43 44 if (allocation < ALLOCATION_MIN || allocation > ALLOCATION_MAX) 45 return END_OF_TESTS; 46 47 sprintf(allocation_str, "%d", allocation); 48 49 ret = write_schemata(p->ctrlgrp, allocation_str, p->cpu_no, 50 p->resctrl_val); 51 if (ret < 0) 52 return ret; 53 54 allocation -= ALLOCATION_STEP; 55 56 return 0; 57 } 58 59 static bool show_mba_info(unsigned long *bw_imc, unsigned long *bw_resc) 60 { 61 int allocation, runs; 62 bool ret = false; 63 64 ksft_print_msg("Results are displayed in (MB)\n"); 65 /* Memory bandwidth from 100% down to 10% */ 66 for (allocation = 0; allocation < ALLOCATION_MAX / ALLOCATION_STEP; 67 allocation++) { 68 unsigned long avg_bw_imc, avg_bw_resc; 69 unsigned long sum_bw_imc = 0, sum_bw_resc = 0; 70 int avg_diff_per; 71 float avg_diff; 72 73 /* 74 * The first run is discarded due to inaccurate value from 75 * phase transition. 76 */ 77 for (runs = NUM_OF_RUNS * allocation + 1; 78 runs < NUM_OF_RUNS * allocation + NUM_OF_RUNS ; runs++) { 79 sum_bw_imc += bw_imc[runs]; 80 sum_bw_resc += bw_resc[runs]; 81 } 82 83 avg_bw_imc = sum_bw_imc / (NUM_OF_RUNS - 1); 84 avg_bw_resc = sum_bw_resc / (NUM_OF_RUNS - 1); 85 avg_diff = (float)labs(avg_bw_resc - avg_bw_imc) / avg_bw_imc; 86 avg_diff_per = (int)(avg_diff * 100); 87 88 ksft_print_msg("%s Check MBA diff within %d%% for schemata %u\n", 89 avg_diff_per > MAX_DIFF_PERCENT ? 90 "Fail:" : "Pass:", 91 MAX_DIFF_PERCENT, 92 ALLOCATION_MAX - ALLOCATION_STEP * allocation); 93 94 ksft_print_msg("avg_diff_per: %d%%\n", avg_diff_per); 95 ksft_print_msg("avg_bw_imc: %lu\n", avg_bw_imc); 96 ksft_print_msg("avg_bw_resc: %lu\n", avg_bw_resc); 97 if (avg_diff_per > MAX_DIFF_PERCENT) 98 ret = true; 99 } 100 101 ksft_print_msg("%s Check schemata change using MBA\n", 102 ret ? "Fail:" : "Pass:"); 103 if (ret) 104 ksft_print_msg("At least one test failed\n"); 105 106 return ret; 107 } 108 109 static int check_results(void) 110 { 111 char *token_array[8], output[] = RESULT_FILE_NAME, temp[512]; 112 unsigned long bw_imc[1024], bw_resc[1024]; 113 int runs; 114 FILE *fp; 115 116 fp = fopen(output, "r"); 117 if (!fp) { 118 perror(output); 119 120 return errno; 121 } 122 123 runs = 0; 124 while (fgets(temp, sizeof(temp), fp)) { 125 char *token = strtok(temp, ":\t"); 126 int fields = 0; 127 128 while (token) { 129 token_array[fields++] = token; 130 token = strtok(NULL, ":\t"); 131 } 132 133 /* Field 3 is perf imc value */ 134 bw_imc[runs] = strtoul(token_array[3], NULL, 0); 135 /* Field 5 is resctrl value */ 136 bw_resc[runs] = strtoul(token_array[5], NULL, 0); 137 runs++; 138 } 139 140 fclose(fp); 141 142 return show_mba_info(bw_imc, bw_resc); 143 } 144 145 void mba_test_cleanup(void) 146 { 147 remove(RESULT_FILE_NAME); 148 } 149 150 int mba_schemata_change(int cpu_no, char *bw_report, char **benchmark_cmd) 151 { 152 struct resctrl_val_param param = { 153 .resctrl_val = MBA_STR, 154 .ctrlgrp = "c1", 155 .mongrp = "m1", 156 .cpu_no = cpu_no, 157 .mum_resctrlfs = true, 158 .filename = RESULT_FILE_NAME, 159 .bw_report = bw_report, 160 .setup = mba_setup 161 }; 162 int ret; 163 164 remove(RESULT_FILE_NAME); 165 166 ret = resctrl_val(benchmark_cmd, ¶m); 167 if (ret) 168 goto out; 169 170 ret = check_results(); 171 172 out: 173 mba_test_cleanup(); 174 175 return ret; 176 } 177