1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Memory Bandwidth Monitoring (MBM) 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
13 #define RESULT_FILE_NAME "result_mbm"
14 #define MAX_DIFF_PERCENT 5
15 #define NUM_OF_RUNS 5
16
17 static int
show_bw_info(unsigned long * bw_imc,unsigned long * bw_resc,int span)18 show_bw_info(unsigned long *bw_imc, unsigned long *bw_resc, int span)
19 {
20 unsigned long avg_bw_imc = 0, avg_bw_resc = 0;
21 unsigned long sum_bw_imc = 0, sum_bw_resc = 0;
22 int runs, ret, avg_diff_per;
23 float avg_diff = 0;
24
25 /*
26 * Discard the first value which is inaccurate due to monitoring setup
27 * transition phase.
28 */
29 for (runs = 1; runs < NUM_OF_RUNS ; runs++) {
30 sum_bw_imc += bw_imc[runs];
31 sum_bw_resc += bw_resc[runs];
32 }
33
34 avg_bw_imc = sum_bw_imc / 4;
35 avg_bw_resc = sum_bw_resc / 4;
36 avg_diff = (float)labs(avg_bw_resc - avg_bw_imc) / avg_bw_imc;
37 avg_diff_per = (int)(avg_diff * 100);
38
39 ret = avg_diff_per > MAX_DIFF_PERCENT;
40 ksft_print_msg("%s Check MBM diff within %d%%\n",
41 ret ? "Fail:" : "Pass:", MAX_DIFF_PERCENT);
42 ksft_print_msg("avg_diff_per: %d%%\n", avg_diff_per);
43 ksft_print_msg("Span (MB): %d\n", span);
44 ksft_print_msg("avg_bw_imc: %lu\n", avg_bw_imc);
45 ksft_print_msg("avg_bw_resc: %lu\n", avg_bw_resc);
46
47 return ret;
48 }
49
check_results(int span)50 static int check_results(int span)
51 {
52 unsigned long bw_imc[NUM_OF_RUNS], bw_resc[NUM_OF_RUNS];
53 char temp[1024], *token_array[8];
54 char output[] = RESULT_FILE_NAME;
55 int runs, ret;
56 FILE *fp;
57
58 ksft_print_msg("Checking for pass/fail\n");
59
60 fp = fopen(output, "r");
61 if (!fp) {
62 perror(output);
63
64 return errno;
65 }
66
67 runs = 0;
68 while (fgets(temp, sizeof(temp), fp)) {
69 char *token = strtok(temp, ":\t");
70 int i = 0;
71
72 while (token) {
73 token_array[i++] = token;
74 token = strtok(NULL, ":\t");
75 }
76
77 bw_resc[runs] = strtoul(token_array[5], NULL, 0);
78 bw_imc[runs] = strtoul(token_array[3], NULL, 0);
79 runs++;
80 }
81
82 ret = show_bw_info(bw_imc, bw_resc, span);
83
84 fclose(fp);
85
86 return ret;
87 }
88
mbm_setup(int num,...)89 static int mbm_setup(int num, ...)
90 {
91 struct resctrl_val_param *p;
92 static int num_of_runs;
93 va_list param;
94 int ret = 0;
95
96 /* Run NUM_OF_RUNS times */
97 if (num_of_runs++ >= NUM_OF_RUNS)
98 return -1;
99
100 va_start(param, num);
101 p = va_arg(param, struct resctrl_val_param *);
102 va_end(param);
103
104 /* Set up shemata with 100% allocation on the first run. */
105 if (num_of_runs == 0)
106 ret = write_schemata(p->ctrlgrp, "100", p->cpu_no,
107 p->resctrl_val);
108
109 return ret;
110 }
111
mbm_test_cleanup(void)112 void mbm_test_cleanup(void)
113 {
114 remove(RESULT_FILE_NAME);
115 }
116
mbm_bw_change(int span,int cpu_no,char * bw_report,char ** benchmark_cmd)117 int mbm_bw_change(int span, int cpu_no, char *bw_report, char **benchmark_cmd)
118 {
119 struct resctrl_val_param param = {
120 .resctrl_val = MBM_STR,
121 .ctrlgrp = "c1",
122 .mongrp = "m1",
123 .span = span,
124 .cpu_no = cpu_no,
125 .mum_resctrlfs = 1,
126 .filename = RESULT_FILE_NAME,
127 .bw_report = bw_report,
128 .setup = mbm_setup
129 };
130 int ret;
131
132 remove(RESULT_FILE_NAME);
133
134 ret = resctrl_val(benchmark_cmd, ¶m);
135 if (ret)
136 return ret;
137
138 ret = check_results(span);
139 if (ret)
140 return ret;
141
142 mbm_test_cleanup();
143
144 return 0;
145 }
146