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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 cmt_setup(const struct resctrl_test *test,
const struct user_params *uparams,
struct resctrl_val_param *p)
{
/* 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 show_results_info(unsigned long sum_llc_val, int no_of_bits,
unsigned long cache_span, unsigned long max_diff,
unsigned long max_diff_percent, unsigned long num_of_runs,
bool platform)
{
unsigned long avg_llc_val = 0;
float diff_percent;
long avg_diff = 0;
int ret;
avg_llc_val = sum_llc_val / num_of_runs;
avg_diff = (long)(cache_span - avg_llc_val);
diff_percent = ((float)cache_span - avg_llc_val) / cache_span * 100;
ret = platform && abs((int)diff_percent) > max_diff_percent &&
labs(avg_diff) > max_diff;
ksft_print_msg("%s Check cache miss rate within %lu%%\n",
ret ? "Fail:" : "Pass:", max_diff_percent);
ksft_print_msg("Percent diff=%d\n", abs((int)diff_percent));
show_cache_info(no_of_bits, avg_llc_val, cache_span, false);
return ret;
}
static int check_results(struct resctrl_val_param *param, size_t span, 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) {
ksft_perror("Error in opening file");
return -1;
}
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_results_info(sum_llc_occu_resc, no_of_bits, span,
MAX_DIFF, MAX_DIFF_PERCENT, runs - 1, true);
}
static void cmt_test_cleanup(void)
{
remove(RESULT_FILE_NAME);
}
static int cmt_run_test(const struct resctrl_test *test, const struct user_params *uparams)
{
const char * const *cmd = uparams->benchmark_cmd;
const char *new_cmd[BENCHMARK_ARGS];
unsigned long cache_total_size = 0;
int n = uparams->bits ? : 5;
unsigned long long_mask;
char *span_str = NULL;
int count_of_bits;
size_t span;
int ret, i;
ret = get_full_cbm("L3", &long_mask);
if (ret)
return ret;
ret = get_cache_size(uparams->cpu, "L3", &cache_total_size);
if (ret)
return ret;
ksft_print_msg("Cache size :%lu\n", cache_total_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",
.filename = RESULT_FILE_NAME,
.mask = ~(long_mask << n) & long_mask,
.num_of_runs = 0,
.setup = cmt_setup,
};
span = cache_portion_size(cache_total_size, param.mask, long_mask);
if (strcmp(cmd[0], "fill_buf") == 0) {
/* Duplicate the command to be able to replace span in it */
for (i = 0; uparams->benchmark_cmd[i]; i++)
new_cmd[i] = uparams->benchmark_cmd[i];
new_cmd[i] = NULL;
ret = asprintf(&span_str, "%zu", span);
if (ret < 0)
return -1;
new_cmd[1] = span_str;
cmd = new_cmd;
}
remove(RESULT_FILE_NAME);
ret = resctrl_val(test, uparams, cmd, ¶m);
if (ret)
goto out;
ret = check_results(¶m, span, n);
if (ret && (get_vendor() == ARCH_INTEL))
ksft_print_msg("Intel CMT may be inaccurate when Sub-NUMA Clustering is enabled. Check BIOS configuration.\n");
out:
free(span_str);
return ret;
}
static bool cmt_feature_check(const struct resctrl_test *test)
{
return test_resource_feature_check(test) &&
resctrl_mon_feature_exists("L3_MON", "llc_occupancy");
}
struct resctrl_test cmt_test = {
.name = "CMT",
.resource = "L3",
.feature_check = cmt_feature_check,
.run_test = cmt_run_test,
.cleanup = cmt_test_cleanup,
};
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