// 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	15#define NUM_OF_RUNS		5 static intshow_bw_info(unsigned long *bw_imc, unsigned long *bw_resc, size_t span){	unsigned long sum_bw_imc = 0, sum_bw_resc = 0;	long avg_bw_imc = 0, avg_bw_resc = 0;	int runs, ret, avg_diff_per;	float avg_diff = 0; 	for (runs = 0; runs < NUM_OF_RUNS; runs++) {		sum_bw_imc += bw_imc[runs];		sum_bw_resc += bw_resc[runs];	} 	avg_bw_imc = sum_bw_imc / NUM_OF_RUNS;	avg_bw_resc = sum_bw_resc / NUM_OF_RUNS;	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);	if (span)		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) {		ksft_perror(output); 		return -1;	} 	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_init(const struct resctrl_test *test,		    const struct user_params *uparams,		    const struct resctrl_val_param *param, int domain_id){	int ret; 	ret = initialize_read_mem_bw_imc();	if (ret)		return ret; 	initialize_mem_bw_resctrl(param, domain_id); 	return 0;} static int mbm_setup(const struct resctrl_test *test,		     const struct user_params *uparams,		     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 && resctrl_resource_exists("MB"))		ret = write_schemata(p->ctrlgrp, "100", uparams->cpu, test->resource); 	p->num_of_runs++; 	return ret;} static int mbm_measure(const struct user_params *uparams,		       struct resctrl_val_param *param, pid_t bm_pid){	return measure_read_mem_bw(uparams, param, bm_pid);} static void mbm_test_cleanup(void){	remove(RESULT_FILE_NAME);} static int mbm_run_test(const struct resctrl_test *test, const struct user_params *uparams){	struct resctrl_val_param param = {		.ctrlgrp	= "c1",		.filename	= RESULT_FILE_NAME,		.init		= mbm_init,		.setup		= mbm_setup,		.measure	= mbm_measure,	};	struct fill_buf_param fill_buf = {};	int ret; 	remove(RESULT_FILE_NAME); 	if (uparams->fill_buf) {		fill_buf.buf_size = uparams->fill_buf->buf_size;		fill_buf.memflush = uparams->fill_buf->memflush;		param.fill_buf = &fill_buf;	} else if (!uparams->benchmark_cmd[0]) {		ssize_t buf_size; 		buf_size = get_fill_buf_size(uparams->cpu, "L3");		if (buf_size < 0)			return buf_size;		fill_buf.buf_size = buf_size;		fill_buf.memflush = true;		param.fill_buf = &fill_buf;	} 	ret = resctrl_val(test, uparams, &param);	if (ret)		return ret; 	ret = check_results(param.fill_buf ? param.fill_buf->buf_size : 0);	if (ret && (get_vendor() == ARCH_INTEL) && !snc_kernel_support())		ksft_print_msg("Kernel doesn't support Sub-NUMA Clustering but it is enabled on the system.\n"); 	return ret;} static bool mbm_feature_check(const struct resctrl_test *test){	return resctrl_mon_feature_exists("L3_MON", "mbm_total_bytes") &&	       resctrl_mon_feature_exists("L3_MON", "mbm_local_bytes");} struct resctrl_test mbm_test = {	.name = "MBM",	.resource = "MB",	.vendor_specific = ARCH_INTEL,	.feature_check = mbm_feature_check,	.run_test = mbm_run_test,	.cleanup = mbm_test_cleanup,};