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// SPDX-License-Identifier: GPL-2.0
/*
* Cache Monitoring Technology (CMT) 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_cmt"
#define NUM_OF_RUNS 5
#define MAX_DIFF 2000000
#define MAX_DIFF_PERCENT 15
static int count_of_bits;
static char cbm_mask[256];
static unsigned long long_mask;
static unsigned long cache_size;
static int cmt_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 END_OF_TESTS;
p->num_of_runs++;
return 0;
}
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;
ksft_print_msg("Checking for pass/fail\n");
fp = fopen(param->filename, "r");
if (!fp) {
perror("# Error in opening file\n");
return errno;
}
while (fgets(temp, sizeof(temp), 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);
return show_cache_info(sum_llc_occu_resc, no_of_bits, param->span,
MAX_DIFF, MAX_DIFF_PERCENT, NUM_OF_RUNS,
true, true);
}
void cmt_test_cleanup(void)
{
remove(RESULT_FILE_NAME);
}
int cmt_resctrl_val(int cpu_no, int n, char **benchmark_cmd)
{
int ret;
cache_size = 0;
ret = remount_resctrlfs(true);
if (ret)
return ret;
if (!validate_resctrl_feature_request(CMT_STR))
return -1;
ret = get_cbm_mask("L3", cbm_mask);
if (ret)
return ret;
long_mask = strtoul(cbm_mask, NULL, 16);
ret = get_cache_size(cpu_no, "L3", &cache_size);
if (ret)
return ret;
ksft_print_msg("Cache size :%lu\n", cache_size);
count_of_bits = count_bits(long_mask);
if (n < 1 || n > count_of_bits) {
ksft_print_msg("Invalid input value for numbr_of_bits n!\n");
ksft_print_msg("Please enter value in range 1 to %d\n", count_of_bits);
return -1;
}
struct resctrl_val_param param = {
.resctrl_val = CMT_STR,
.ctrlgrp = "c1",
.mongrp = "m1",
.cpu_no = cpu_no,
.mum_resctrlfs = false,
.filename = RESULT_FILE_NAME,
.mask = ~(long_mask << n) & long_mask,
.span = cache_size * n / count_of_bits,
.num_of_runs = 0,
.setup = cmt_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)
goto out;
ret = check_results(¶m, n);
out:
cmt_test_cleanup();
return ret;
}
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