tools/testing/selftests/resctrl/cqm_test.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Cache Monitoring Technology (CQM) 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 #include <unistd.h>
  13
  14 #define RESULT_FILE_NAME        "result_cqm"
  15 #define NUM_OF_RUNS             5
  16 #define MAX_DIFF                2000000
  17 #define MAX_DIFF_PERCENT        15
  18
  19 int count_of_bits;
  20 char cbm_mask[256];
  21 unsigned long long_mask;
  22 unsigned long cache_size;
  23
  24 static int cqm_setup(int num, ...)
  25 {
  26         struct resctrl_val_param *p;
  27         va_list param;
  28
  29         va_start(param, num);
  30         p = va_arg(param, struct resctrl_val_param *);
  31         va_end(param);
  32
  33         /* Run NUM_OF_RUNS times */
  34         if (p->num_of_runs >= NUM_OF_RUNS)
  35                 return -1;
  36
  37         p->num_of_runs++;
  38
  39         return 0;
  40 }
  41
  42 static void show_cache_info(unsigned long sum_llc_occu_resc, int no_of_bits,
  43                             unsigned long span)
  44 {
  45         unsigned long avg_llc_occu_resc = 0;
  46         float diff_percent;
  47         long avg_diff = 0;
  48         bool res;
  49
  50         avg_llc_occu_resc = sum_llc_occu_resc / (NUM_OF_RUNS - 1);
  51         avg_diff = (long)abs(span - avg_llc_occu_resc);
  52
  53         diff_percent = (((float)span - avg_llc_occu_resc) / span) * 100;
  54
  55         if ((abs((int)diff_percent) <= MAX_DIFF_PERCENT) ||
  56             (abs(avg_diff) <= MAX_DIFF))
  57                 res = true;
  58         else
  59                 res = false;
  60
  61         printf("%sok CQM: diff within %d, %d\%%\n", res ? "" : "not",
  62                MAX_DIFF, (int)MAX_DIFF_PERCENT);
  63
  64         printf("# diff: %ld\n", avg_diff);
  65         printf("# percent diff=%d\n", abs((int)diff_percent));
  66         printf("# Results are displayed in (Bytes)\n");
  67         printf("# Number of bits: %d\n", no_of_bits);
  68         printf("# Avg_llc_occu_resc: %lu\n", avg_llc_occu_resc);
  69         printf("# llc_occu_exp (span): %lu\n", span);
  70
  71         tests_run++;
  72 }
  73
  74 static int check_results(struct resctrl_val_param *param, int no_of_bits)
  75 {
  76         char *token_array[8], temp[512];
  77         unsigned long sum_llc_occu_resc = 0;
  78         int runs = 0;
  79         FILE *fp;
  80
  81         printf("# checking for pass/fail\n");
  82         fp = fopen(param->filename, "r");
  83         if (!fp) {
  84                 perror("# Error in opening file\n");
  85
  86                 return errno;
  87         }
  88
  89         while (fgets(temp, 1024, fp)) {
  90                 char *token = strtok(temp, ":\t");
  91                 int fields = 0;
  92
  93                 while (token) {
  94                         token_array[fields++] = token;
  95                         token = strtok(NULL, ":\t");
  96                 }
  97
  98                 /* Field 3 is llc occ resc value */
  99                 if (runs > 0)
 100                         sum_llc_occu_resc += strtoul(token_array[3], NULL, 0);
 101                 runs++;
 102         }
 103         fclose(fp);
 104         show_cache_info(sum_llc_occu_resc, no_of_bits, param->span);
 105
 106         return 0;
 107 }
 108
 109 void cqm_test_cleanup(void)
 110 {
 111         remove(RESULT_FILE_NAME);
 112 }
 113
 114 int cqm_resctrl_val(int cpu_no, int n, char **benchmark_cmd)
 115 {
 116         int ret, mum_resctrlfs;
 117
 118         cache_size = 0;
 119         mum_resctrlfs = 1;
 120
 121         ret = remount_resctrlfs(mum_resctrlfs);
 122         if (ret)
 123                 return ret;
 124
 125         if (!validate_resctrl_feature_request("cqm"))
 126                 return -1;
 127
 128         ret = get_cbm_mask("L3");
 129         if (ret)
 130                 return ret;
 131
 132         long_mask = strtoul(cbm_mask, NULL, 16);
 133
 134         ret = get_cache_size(cpu_no, "L3", &cache_size);
 135         if (ret)
 136                 return ret;
 137         printf("cache size :%lu\n", cache_size);
 138
 139         count_of_bits = count_bits(long_mask);
 140
 141         if (n < 1 || n > count_of_bits) {
 142                 printf("Invalid input value for numbr_of_bits n!\n");
 143                 printf("Please Enter value in range 1 to %d\n", count_of_bits);
 144                 return -1;
 145         }
 146
 147         struct resctrl_val_param param = {
 148                 .resctrl_val    = "cqm",
 149                 .ctrlgrp        = "c1",
 150                 .mongrp         = "m1",
 151                 .cpu_no         = cpu_no,
 152                 .mum_resctrlfs  = 0,
 153                 .filename       = RESULT_FILE_NAME,
 154                 .mask           = ~(long_mask << n) & long_mask,
 155                 .span           = cache_size * n / count_of_bits,
 156                 .num_of_runs    = 0,
 157                 .setup          = cqm_setup,
 158         };
 159
 160         if (strcmp(benchmark_cmd[0], "fill_buf") == 0)
 161                 sprintf(benchmark_cmd[1], "%lu", param.span);
 162
 163         remove(RESULT_FILE_NAME);
 164
 165         ret = resctrl_val(benchmark_cmd, &param);
 166         if (ret)
 167                 return ret;
 168
 169         ret = check_results(&param, n);
 170         if (ret)
 171                 return ret;
 172
 173         cqm_test_cleanup();
 174
 175         return 0;
 176 }