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// SPDX-License-Identifier: GPL-2.0
/*
* Cache Monitoring Technology (CQM) test
*
* Copyright (C) 2018 Intel Corporation
*
* Authors:
* Sai Praneeth Prakhya <sai.praneeth.prakhya@intel.com>,
* Fenghua Yu <fenghua.yu@intel.com>
*/
#include "resctrl.h"
#include <unistd.h>
#define RESULT_FILE_NAME "result_cqm"
#define NUM_OF_RUNS 5
#define MAX_DIFF 2000000
#define MAX_DIFF_PERCENT 15
int count_of_bits;
char cbm_mask[256];
unsigned long long_mask;
unsigned long cache_size;
static int cqm_setup(int num, ...)
{
struct resctrl_val_param *p;
va_list param;
va_start(param, num);
p = va_arg(param, struct resctrl_val_param *);
va_end(param);
/* Run NUM_OF_RUNS times */
if (p->num_of_runs >= NUM_OF_RUNS)
return -1;
p->num_of_runs++;
return 0;
}
static void show_cache_info(unsigned long sum_llc_occu_resc, int no_of_bits,
unsigned long span)
{
unsigned long avg_llc_occu_resc = 0;
float diff_percent;
long avg_diff = 0;
bool res;
avg_llc_occu_resc = sum_llc_occu_resc / (NUM_OF_RUNS - 1);
avg_diff = (long)abs(span - avg_llc_occu_resc);
diff_percent = (((float)span - avg_llc_occu_resc) / span) * 100;
if ((abs((int)diff_percent) <= MAX_DIFF_PERCENT) ||
(abs(avg_diff) <= MAX_DIFF))
res = true;
else
res = false;
printf("%sok CQM: diff within %d, %d\%%\n", res ? "" : "not",
MAX_DIFF, (int)MAX_DIFF_PERCENT);
printf("# diff: %ld\n", avg_diff);
printf("# percent diff=%d\n", abs((int)diff_percent));
printf("# Results are displayed in (Bytes)\n");
printf("# Number of bits: %d\n", no_of_bits);
printf("# Avg_llc_occu_resc: %lu\n", avg_llc_occu_resc);
printf("# llc_occu_exp (span): %lu\n", span);
tests_run++;
}
static int check_results(struct resctrl_val_param *param, int no_of_bits)
{
char *token_array[8], temp[512];
unsigned long sum_llc_occu_resc = 0;
int runs = 0;
FILE *fp;
printf("# checking for pass/fail\n");
fp = fopen(param->filename, "r");
if (!fp) {
perror("# Error in opening file\n");
return errno;
}
while (fgets(temp, 1024, fp)) {
char *token = strtok(temp, ":\t");
int fields = 0;
while (token) {
token_array[fields++] = token;
token = strtok(NULL, ":\t");
}
/* Field 3 is llc occ resc value */
if (runs > 0)
sum_llc_occu_resc += strtoul(token_array[3], NULL, 0);
runs++;
}
fclose(fp);
show_cache_info(sum_llc_occu_resc, no_of_bits, param->span);
return 0;
}
void cqm_test_cleanup(void)
{
remove(RESULT_FILE_NAME);
}
int cqm_resctrl_val(int cpu_no, int n, char **benchmark_cmd)
{
int ret, mum_resctrlfs;
cache_size = 0;
mum_resctrlfs = 1;
ret = remount_resctrlfs(mum_resctrlfs);
if (ret)
return ret;
if (!validate_resctrl_feature_request("cqm"))
return -1;
ret = get_cbm_mask("L3");
if (ret)
return ret;
long_mask = strtoul(cbm_mask, NULL, 16);
ret = get_cache_size(cpu_no, "L3", &cache_size);
if (ret)
return ret;
printf("cache size :%lu\n", cache_size);
count_of_bits = count_bits(long_mask);
if (n < 1 || n > count_of_bits) {
printf("Invalid input value for numbr_of_bits n!\n");
printf("Please Enter value in range 1 to %d\n", count_of_bits);
return -1;
}
struct resctrl_val_param param = {
.resctrl_val = "cqm",
.ctrlgrp = "c1",
.mongrp = "m1",
.cpu_no = cpu_no,
.mum_resctrlfs = 0,
.filename = RESULT_FILE_NAME,
.mask = ~(long_mask << n) & long_mask,
.span = cache_size * n / count_of_bits,
.num_of_runs = 0,
.setup = cqm_setup,
};
if (strcmp(benchmark_cmd[0], "fill_buf") == 0)
sprintf(benchmark_cmd[1], "%lu", param.span);
remove(RESULT_FILE_NAME);
ret = resctrl_val(benchmark_cmd, ¶m);
if (ret)
return ret;
ret = check_results(¶m, n);
if (ret)
return ret;
cqm_test_cleanup();
return 0;
}
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