1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Memory Bandwidth Allocation (MBA) 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_mba"
14 #define NUM_OF_RUNS 5
15 #define MAX_DIFF_PERCENT 5
16 #define ALLOCATION_MAX 100
17 #define ALLOCATION_MIN 10
18 #define ALLOCATION_STEP 10
19
20 /*
21 * Change schemata percentage from 100 to 10%. Write schemata to specified
22 * con_mon grp, mon_grp in resctrl FS.
23 * For each allocation, run 5 times in order to get average values.
24 */
mba_setup(int num,...)25 static int mba_setup(int num, ...)
26 {
27 static int runs_per_allocation, allocation = 100;
28 struct resctrl_val_param *p;
29 char allocation_str[64];
30 va_list param;
31
32 va_start(param, num);
33 p = va_arg(param, struct resctrl_val_param *);
34 va_end(param);
35
36 if (runs_per_allocation >= NUM_OF_RUNS)
37 runs_per_allocation = 0;
38
39 /* Only set up schemata once every NUM_OF_RUNS of allocations */
40 if (runs_per_allocation++ != 0)
41 return 0;
42
43 if (allocation < ALLOCATION_MIN || allocation > ALLOCATION_MAX)
44 return -1;
45
46 sprintf(allocation_str, "%d", allocation);
47
48 write_schemata(p->ctrlgrp, allocation_str, p->cpu_no, p->resctrl_val);
49 allocation -= ALLOCATION_STEP;
50
51 return 0;
52 }
53
show_mba_info(unsigned long * bw_imc,unsigned long * bw_resc)54 static void show_mba_info(unsigned long *bw_imc, unsigned long *bw_resc)
55 {
56 int allocation, runs;
57 bool failed = false;
58
59 ksft_print_msg("Results are displayed in (MB)\n");
60 /* Memory bandwidth from 100% down to 10% */
61 for (allocation = 0; allocation < ALLOCATION_MAX / ALLOCATION_STEP;
62 allocation++) {
63 unsigned long avg_bw_imc, avg_bw_resc;
64 unsigned long sum_bw_imc = 0, sum_bw_resc = 0;
65 int avg_diff_per;
66 float avg_diff;
67
68 /*
69 * The first run is discarded due to inaccurate value from
70 * phase transition.
71 */
72 for (runs = NUM_OF_RUNS * allocation + 1;
73 runs < NUM_OF_RUNS * allocation + NUM_OF_RUNS ; runs++) {
74 sum_bw_imc += bw_imc[runs];
75 sum_bw_resc += bw_resc[runs];
76 }
77
78 avg_bw_imc = sum_bw_imc / (NUM_OF_RUNS - 1);
79 avg_bw_resc = sum_bw_resc / (NUM_OF_RUNS - 1);
80 avg_diff = (float)labs(avg_bw_resc - avg_bw_imc) / avg_bw_imc;
81 avg_diff_per = (int)(avg_diff * 100);
82
83 ksft_print_msg("%s Check MBA diff within %d%% for schemata %u\n",
84 avg_diff_per > MAX_DIFF_PERCENT ?
85 "Fail:" : "Pass:",
86 MAX_DIFF_PERCENT,
87 ALLOCATION_MAX - ALLOCATION_STEP * allocation);
88
89 ksft_print_msg("avg_diff_per: %d%%\n", avg_diff_per);
90 ksft_print_msg("avg_bw_imc: %lu\n", avg_bw_imc);
91 ksft_print_msg("avg_bw_resc: %lu\n", avg_bw_resc);
92 if (avg_diff_per > MAX_DIFF_PERCENT)
93 failed = true;
94 }
95
96 ksft_print_msg("%s Check schemata change using MBA\n",
97 failed ? "Fail:" : "Pass:");
98 if (failed)
99 ksft_print_msg("At least one test failed\n");
100 }
101
check_results(void)102 static int check_results(void)
103 {
104 char *token_array[8], output[] = RESULT_FILE_NAME, temp[512];
105 unsigned long bw_imc[1024], bw_resc[1024];
106 int runs;
107 FILE *fp;
108
109 fp = fopen(output, "r");
110 if (!fp) {
111 perror(output);
112
113 return errno;
114 }
115
116 runs = 0;
117 while (fgets(temp, sizeof(temp), fp)) {
118 char *token = strtok(temp, ":\t");
119 int fields = 0;
120
121 while (token) {
122 token_array[fields++] = token;
123 token = strtok(NULL, ":\t");
124 }
125
126 /* Field 3 is perf imc value */
127 bw_imc[runs] = strtoul(token_array[3], NULL, 0);
128 /* Field 5 is resctrl value */
129 bw_resc[runs] = strtoul(token_array[5], NULL, 0);
130 runs++;
131 }
132
133 fclose(fp);
134
135 show_mba_info(bw_imc, bw_resc);
136
137 return 0;
138 }
139
mba_test_cleanup(void)140 void mba_test_cleanup(void)
141 {
142 remove(RESULT_FILE_NAME);
143 }
144
mba_schemata_change(int cpu_no,char * bw_report,char ** benchmark_cmd)145 int mba_schemata_change(int cpu_no, char *bw_report, char **benchmark_cmd)
146 {
147 struct resctrl_val_param param = {
148 .resctrl_val = MBA_STR,
149 .ctrlgrp = "c1",
150 .mongrp = "m1",
151 .cpu_no = cpu_no,
152 .mum_resctrlfs = 1,
153 .filename = RESULT_FILE_NAME,
154 .bw_report = bw_report,
155 .setup = mba_setup
156 };
157 int ret;
158
159 remove(RESULT_FILE_NAME);
160
161 ret = resctrl_val(benchmark_cmd, ¶m);
162 if (ret)
163 return ret;
164
165 ret = check_results();
166 if (ret)
167 return ret;
168
169 mba_test_cleanup();
170
171 return 0;
172 }
173