1// SPDX-License-Identifier: GPL-2.0
  2/*
  3 * Cache Monitoring Technology (CMT) test
  4 *
  5 * Copyright (C) 2018 Intel Corporation
  6 *
  7 * Authors:
  8 *    Sai Praneeth Prakhya <sai.praneeth.prakhya@intel.com>,
  9 *    Fenghua Yu <fenghua.yu@intel.com>
 10 */
 11#include "resctrl.h"
 12#include <unistd.h>
 13
 14#define RESULT_FILE_NAME	"result_cmt"
 15#define NUM_OF_RUNS		5
 16#define MAX_DIFF		2000000
 17#define MAX_DIFF_PERCENT	15
 18
 19static int cmt_setup(struct resctrl_val_param *p)
 20{
 21	/* Run NUM_OF_RUNS times */
 22	if (p->num_of_runs >= NUM_OF_RUNS)
 23		return END_OF_TESTS;
 24
 25	p->num_of_runs++;
 26
 27	return 0;
 28}
 29
 30static int check_results(struct resctrl_val_param *param, size_t span, int no_of_bits)
 31{
 32	char *token_array[8], temp[512];
 33	unsigned long sum_llc_occu_resc = 0;
 34	int runs = 0;
 35	FILE *fp;
 36
 37	ksft_print_msg("Checking for pass/fail\n");
 38	fp = fopen(param->filename, "r");
 39	if (!fp) {
 40		perror("# Error in opening file\n");
 41
 42		return errno;
 43	}
 44
 45	while (fgets(temp, sizeof(temp), fp)) {
 46		char *token = strtok(temp, ":\t");
 47		int fields = 0;
 48
 49		while (token) {
 50			token_array[fields++] = token;
 51			token = strtok(NULL, ":\t");
 52		}
 53
 54		/* Field 3 is llc occ resc value */
 55		if (runs > 0)
 56			sum_llc_occu_resc += strtoul(token_array[3], NULL, 0);
 57		runs++;
 58	}
 59	fclose(fp);
 60
 61	return show_cache_info(sum_llc_occu_resc, no_of_bits, span,
 62			       MAX_DIFF, MAX_DIFF_PERCENT, runs - 1,
 63			       true, true);
 64}
 65
 66void cmt_test_cleanup(void)
 67{
 68	remove(RESULT_FILE_NAME);
 69}
 70
 71int cmt_resctrl_val(int cpu_no, int n, const char * const *benchmark_cmd)
 72{
 73	const char * const *cmd = benchmark_cmd;
 74	const char *new_cmd[BENCHMARK_ARGS];
 75	unsigned long cache_size = 0;
 76	unsigned long long_mask;
 77	char *span_str = NULL;
 78	char cbm_mask[256];
 79	int count_of_bits;
 80	size_t span;
 81	int ret, i;
 82
 83	ret = get_cbm_mask("L3", cbm_mask);
 84	if (ret)
 85		return ret;
 86
 87	long_mask = strtoul(cbm_mask, NULL, 16);
 88
 89	ret = get_cache_size(cpu_no, "L3", &cache_size);
 90	if (ret)
 91		return ret;
 92	ksft_print_msg("Cache size :%lu\n", cache_size);
 93
 94	count_of_bits = count_bits(long_mask);
 95
 96	if (n < 1 || n > count_of_bits) {
 97		ksft_print_msg("Invalid input value for numbr_of_bits n!\n");
 98		ksft_print_msg("Please enter value in range 1 to %d\n", count_of_bits);
 99		return -1;
100	}
101
102	struct resctrl_val_param param = {
103		.resctrl_val	= CMT_STR,
104		.ctrlgrp	= "c1",
105		.mongrp		= "m1",
106		.cpu_no		= cpu_no,
107		.filename	= RESULT_FILE_NAME,
108		.mask		= ~(long_mask << n) & long_mask,
109		.num_of_runs	= 0,
110		.setup		= cmt_setup,
111	};
112
113	span = cache_size * n / count_of_bits;
114
115	if (strcmp(cmd[0], "fill_buf") == 0) {
116		/* Duplicate the command to be able to replace span in it */
117		for (i = 0; benchmark_cmd[i]; i++)
118			new_cmd[i] = benchmark_cmd[i];
119		new_cmd[i] = NULL;
120
121		ret = asprintf(&span_str, "%zu", span);
122		if (ret < 0)
123			return -1;
124		new_cmd[1] = span_str;
125		cmd = new_cmd;
126	}
127
128	remove(RESULT_FILE_NAME);
129
130	ret = resctrl_val(cmd, &param);
131	if (ret)
132		goto out;
133
134	ret = check_results(&param, span, n);
135
136out:
137	cmt_test_cleanup();
138	free(span_str);
139
140	return ret;
141}