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