1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Memory Bandwidth Monitoring (MBM) 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_mbm" 14 #define MAX_DIFF_PERCENT 15 15 #define NUM_OF_RUNS 5 16 17 static int 18 show_bw_info(unsigned long *bw_imc, unsigned long *bw_resc, size_t span) 19 { 20 unsigned long sum_bw_imc = 0, sum_bw_resc = 0; 21 long avg_bw_imc = 0, avg_bw_resc = 0; 22 int runs, ret, avg_diff_per; 23 float avg_diff = 0; 24 25 for (runs = 0; runs < NUM_OF_RUNS; runs++) { 26 sum_bw_imc += bw_imc[runs]; 27 sum_bw_resc += bw_resc[runs]; 28 } 29 30 avg_bw_imc = sum_bw_imc / NUM_OF_RUNS; 31 avg_bw_resc = sum_bw_resc / NUM_OF_RUNS; 32 avg_diff = (float)labs(avg_bw_resc - avg_bw_imc) / avg_bw_imc; 33 avg_diff_per = (int)(avg_diff * 100); 34 35 ret = avg_diff_per > MAX_DIFF_PERCENT; 36 ksft_print_msg("%s Check MBM diff within %d%%\n", 37 ret ? "Fail:" : "Pass:", MAX_DIFF_PERCENT); 38 ksft_print_msg("avg_diff_per: %d%%\n", avg_diff_per); 39 if (span) 40 ksft_print_msg("Span (MB): %zu\n", span / MB); 41 ksft_print_msg("avg_bw_imc: %lu\n", avg_bw_imc); 42 ksft_print_msg("avg_bw_resc: %lu\n", avg_bw_resc); 43 44 return ret; 45 } 46 47 static int check_results(size_t span) 48 { 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; 52 int runs, ret; 53 FILE *fp; 54 55 ksft_print_msg("Checking for pass/fail\n"); 56 57 fp = fopen(output, "r"); 58 if (!fp) { 59 ksft_perror(output); 60 61 return -1; 62 } 63 64 runs = 0; 65 while (fgets(temp, sizeof(temp), fp)) { 66 char *token = strtok(temp, ":\t"); 67 int i = 0; 68 69 while (token) { 70 token_array[i++] = token; 71 token = strtok(NULL, ":\t"); 72 } 73 74 bw_resc[runs] = strtoul(token_array[5], NULL, 0); 75 bw_imc[runs] = strtoul(token_array[3], NULL, 0); 76 runs++; 77 } 78 79 ret = show_bw_info(bw_imc, bw_resc, span); 80 81 fclose(fp); 82 83 return ret; 84 } 85 86 static int mbm_init(const struct resctrl_test *test, 87 const struct user_params *uparams, 88 const struct resctrl_val_param *param, int domain_id) 89 { 90 int ret; 91 92 ret = initialize_read_mem_bw_imc(); 93 if (ret) 94 return ret; 95 96 initialize_mem_bw_resctrl(param, domain_id); 97 98 return 0; 99 } 100 101 static int mbm_setup(const struct resctrl_test *test, 102 const struct user_params *uparams, 103 struct resctrl_val_param *p) 104 { 105 int ret = 0; 106 107 /* Run NUM_OF_RUNS times */ 108 if (p->num_of_runs >= NUM_OF_RUNS) 109 return END_OF_TESTS; 110 111 /* Set up shemata with 100% allocation on the first run. */ 112 if (p->num_of_runs == 0 && resctrl_resource_exists("MB")) 113 ret = write_schemata(p->ctrlgrp, "100", uparams->cpu, test->resource); 114 115 p->num_of_runs++; 116 117 return ret; 118 } 119 120 static int mbm_measure(const struct user_params *uparams, 121 struct resctrl_val_param *param, pid_t bm_pid) 122 { 123 return measure_read_mem_bw(uparams, param, bm_pid); 124 } 125 126 static void mbm_test_cleanup(void) 127 { 128 cleanup_read_mem_bw_imc(); 129 remove(RESULT_FILE_NAME); 130 } 131 132 static int mbm_run_test(const struct resctrl_test *test, const struct user_params *uparams) 133 { 134 struct resctrl_val_param param = { 135 .ctrlgrp = "c1", 136 .filename = RESULT_FILE_NAME, 137 .init = mbm_init, 138 .setup = mbm_setup, 139 .measure = mbm_measure, 140 }; 141 struct fill_buf_param fill_buf = {}; 142 int ret; 143 144 remove(RESULT_FILE_NAME); 145 146 if (uparams->fill_buf) { 147 fill_buf.buf_size = uparams->fill_buf->buf_size; 148 fill_buf.memflush = uparams->fill_buf->memflush; 149 param.fill_buf = &fill_buf; 150 } else if (!uparams->benchmark_cmd[0]) { 151 ssize_t buf_size; 152 153 buf_size = get_fill_buf_size(uparams->cpu, "L3"); 154 if (buf_size < 0) 155 return buf_size; 156 fill_buf.buf_size = buf_size; 157 fill_buf.memflush = true; 158 param.fill_buf = &fill_buf; 159 } 160 161 ret = resctrl_val(test, uparams, ¶m); 162 if (ret) 163 return ret; 164 165 ret = check_results(param.fill_buf ? param.fill_buf->buf_size : 0); 166 if (ret && (get_vendor() == ARCH_INTEL) && !snc_kernel_support()) 167 ksft_print_msg("Kernel doesn't support Sub-NUMA Clustering but it is enabled on the system.\n"); 168 169 return ret; 170 } 171 172 static bool mbm_feature_check(const struct resctrl_test *test) 173 { 174 return resctrl_mon_feature_exists("L3_MON", "mbm_total_bytes") && 175 resctrl_mon_feature_exists("L3_MON", "mbm_local_bytes"); 176 } 177 178 struct resctrl_test mbm_test = { 179 .name = "MBM", 180 .resource = "MB", 181 .vendor_specific = ARCH_INTEL, 182 .feature_check = mbm_feature_check, 183 .run_test = mbm_run_test, 184 .cleanup = mbm_test_cleanup, 185 }; 186