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// SPDX-License-Identifier: GPL-2.0
/*
* Memory Bandwidth Monitoring (MBM) test
*
* Copyright (C) 2018 Intel Corporation
*
* Authors:
* Sai Praneeth Prakhya <sai.praneeth.prakhya@intel.com>,
* Fenghua Yu <fenghua.yu@intel.com>
*/
#include "resctrl.h"
#define RESULT_FILE_NAME "result_mbm"
#define MAX_DIFF_PERCENT 8
#define NUM_OF_RUNS 5
static int
show_bw_info(unsigned long *bw_imc, unsigned long *bw_resc, size_t span)
{
unsigned long avg_bw_imc = 0, avg_bw_resc = 0;
unsigned long sum_bw_imc = 0, sum_bw_resc = 0;
int runs, ret, avg_diff_per;
float avg_diff = 0;
/*
* Discard the first value which is inaccurate due to monitoring setup
* transition phase.
*/
for (runs = 1; runs < NUM_OF_RUNS ; runs++) {
sum_bw_imc += bw_imc[runs];
sum_bw_resc += bw_resc[runs];
}
avg_bw_imc = sum_bw_imc / 4;
avg_bw_resc = sum_bw_resc / 4;
avg_diff = (float)labs(avg_bw_resc - avg_bw_imc) / avg_bw_imc;
avg_diff_per = (int)(avg_diff * 100);
ret = avg_diff_per > MAX_DIFF_PERCENT;
ksft_print_msg("%s Check MBM diff within %d%%\n",
ret ? "Fail:" : "Pass:", MAX_DIFF_PERCENT);
ksft_print_msg("avg_diff_per: %d%%\n", avg_diff_per);
ksft_print_msg("Span (MB): %zu\n", span / MB);
ksft_print_msg("avg_bw_imc: %lu\n", avg_bw_imc);
ksft_print_msg("avg_bw_resc: %lu\n", avg_bw_resc);
return ret;
}
static int check_results(size_t span)
{
unsigned long bw_imc[NUM_OF_RUNS], bw_resc[NUM_OF_RUNS];
char temp[1024], *token_array[8];
char output[] = RESULT_FILE_NAME;
int runs, ret;
FILE *fp;
ksft_print_msg("Checking for pass/fail\n");
fp = fopen(output, "r");
if (!fp) {
perror(output);
return errno;
}
runs = 0;
while (fgets(temp, sizeof(temp), fp)) {
char *token = strtok(temp, ":\t");
int i = 0;
while (token) {
token_array[i++] = token;
token = strtok(NULL, ":\t");
}
bw_resc[runs] = strtoul(token_array[5], NULL, 0);
bw_imc[runs] = strtoul(token_array[3], NULL, 0);
runs++;
}
ret = show_bw_info(bw_imc, bw_resc, span);
fclose(fp);
return ret;
}
static int mbm_setup(struct resctrl_val_param *p)
{
int ret = 0;
/* Run NUM_OF_RUNS times */
if (p->num_of_runs >= NUM_OF_RUNS)
return END_OF_TESTS;
/* Set up shemata with 100% allocation on the first run. */
if (p->num_of_runs == 0 && validate_resctrl_feature_request("MB", NULL))
ret = write_schemata(p->ctrlgrp, "100", p->cpu_no,
p->resctrl_val);
p->num_of_runs++;
return ret;
}
void mbm_test_cleanup(void)
{
remove(RESULT_FILE_NAME);
}
int mbm_bw_change(int cpu_no, const char * const *benchmark_cmd)
{
struct resctrl_val_param param = {
.resctrl_val = MBM_STR,
.ctrlgrp = "c1",
.mongrp = "m1",
.cpu_no = cpu_no,
.filename = RESULT_FILE_NAME,
.bw_report = "reads",
.setup = mbm_setup
};
int ret;
remove(RESULT_FILE_NAME);
ret = resctrl_val(benchmark_cmd, ¶m);
if (ret)
goto out;
ret = check_results(DEFAULT_SPAN);
out:
mbm_test_cleanup();
return ret;
}
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