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184 lines · 4.3 KiB

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 <[email protected]>,
9 * Fenghua Yu <[email protected]>
10 */
11#include "resctrl.h"
12
13#define RESULT_FILE_NAME "result_mbm"
14#define MAX_DIFF_PERCENT 15
15#define NUM_OF_RUNS 5
16
17static int
18show_bw_info(unsigned long *bw_imc, unsigned long *bw_resc, size_t span)
19{
20 unsigned long sum_bw_imc = 0, sum_bw_resc = 0;
21 long avg_bw_imc = 0, avg_bw_resc = 0;
22 int runs, ret, avg_diff_per;
23 float avg_diff = 0;
24
25 for (runs = 0; runs < NUM_OF_RUNS; runs++) {
26 sum_bw_imc += bw_imc[runs];
27 sum_bw_resc += bw_resc[runs];
28 }
29
30 avg_bw_imc = sum_bw_imc / NUM_OF_RUNS;
31 avg_bw_resc = sum_bw_resc / NUM_OF_RUNS;
32 avg_diff = (float)labs(avg_bw_resc - avg_bw_imc) / avg_bw_imc;
33 avg_diff_per = (int)(avg_diff * 100);
34
35 ret = avg_diff_per > MAX_DIFF_PERCENT;
36 ksft_print_msg("%s Check MBM diff within %d%%\n",
37 ret ? "Fail:" : "Pass:", MAX_DIFF_PERCENT);
38 ksft_print_msg("avg_diff_per: %d%%\n", avg_diff_per);
39 if (span)
40 ksft_print_msg("Span (MB): %zu\n", span / MB);
41 ksft_print_msg("avg_bw_imc: %lu\n", avg_bw_imc);
42 ksft_print_msg("avg_bw_resc: %lu\n", avg_bw_resc);
43
44 return ret;
45}
46
47static int check_results(size_t span)
48{
49 unsigned long bw_imc[NUM_OF_RUNS], bw_resc[NUM_OF_RUNS];
50 char temp[1024], *token_array[8];
51 char output[] = RESULT_FILE_NAME;
52 int runs, ret;
53 FILE *fp;
54
55 ksft_print_msg("Checking for pass/fail\n");
56
57 fp = fopen(output, "r");
58 if (!fp) {
59 ksft_perror(output);
60
61 return -1;
62 }
63
64 runs = 0;
65 while (fgets(temp, sizeof(temp), fp)) {
66 char *token = strtok(temp, ":\t");
67 int i = 0;
68
69 while (token) {
70 token_array[i++] = token;
71 token = strtok(NULL, ":\t");
72 }
73
74 bw_resc[runs] = strtoul(token_array[5], NULL, 0);
75 bw_imc[runs] = strtoul(token_array[3], NULL, 0);
76 runs++;
77 }
78
79 ret = show_bw_info(bw_imc, bw_resc, span);
80
81 fclose(fp);
82
83 return ret;
84}
85
86static int mbm_init(const struct resctrl_test *test,
87 const struct user_params *uparams,
88 const struct resctrl_val_param *param, int domain_id)
89{
90 int ret;
91
92 ret = initialize_read_mem_bw_imc();
93 if (ret)
94 return ret;
95
96 initialize_mem_bw_resctrl(param, domain_id);
97
98 return 0;
99}
100
101static int mbm_setup(const struct resctrl_test *test,
102 const struct user_params *uparams,
103 struct resctrl_val_param *p)
104{
105 int ret = 0;
106
107 /* Run NUM_OF_RUNS times */
108 if (p->num_of_runs >= NUM_OF_RUNS)
109 return END_OF_TESTS;
110
111 /* Set up shemata with 100% allocation on the first run. */
112 if (p->num_of_runs == 0 && resctrl_resource_exists("MB"))
113 ret = write_schemata(p->ctrlgrp, "100", uparams->cpu, test->resource);
114
115 p->num_of_runs++;
116
117 return ret;
118}
119
120static int mbm_measure(const struct user_params *uparams,
121 struct resctrl_val_param *param, pid_t bm_pid)
122{
123 return measure_read_mem_bw(uparams, param, bm_pid);
124}
125
126static void mbm_test_cleanup(void)
127{
128 remove(RESULT_FILE_NAME);
129}
130
131static int mbm_run_test(const struct resctrl_test *test, const struct user_params *uparams)
132{
133 struct resctrl_val_param param = {
134 .ctrlgrp = "c1",
135 .filename = RESULT_FILE_NAME,
136 .init = mbm_init,
137 .setup = mbm_setup,
138 .measure = mbm_measure,
139 };
140 struct fill_buf_param fill_buf = {};
141 int ret;
142
143 remove(RESULT_FILE_NAME);
144
145 if (uparams->fill_buf) {
146 fill_buf.buf_size = uparams->fill_buf->buf_size;
147 fill_buf.memflush = uparams->fill_buf->memflush;
148 param.fill_buf = &fill_buf;
149 } else if (!uparams->benchmark_cmd[0]) {
150 ssize_t buf_size;
151
152 buf_size = get_fill_buf_size(uparams->cpu, "L3");
153 if (buf_size < 0)
154 return buf_size;
155 fill_buf.buf_size = buf_size;
156 fill_buf.memflush = true;
157 param.fill_buf = &fill_buf;
158 }
159
160 ret = resctrl_val(test, uparams, &param);
161 if (ret)
162 return ret;
163
164 ret = check_results(param.fill_buf ? param.fill_buf->buf_size : 0);
165 if (ret && (get_vendor() == ARCH_INTEL) && !snc_kernel_support())
166 ksft_print_msg("Kernel doesn't support Sub-NUMA Clustering but it is enabled on the system.\n");
167
168 return ret;
169}
170
171static bool mbm_feature_check(const struct resctrl_test *test)
172{
173 return resctrl_mon_feature_exists("L3_MON", "mbm_total_bytes") &&
174 resctrl_mon_feature_exists("L3_MON", "mbm_local_bytes");
175}
176
177struct resctrl_test mbm_test = {
178 .name = "MBM",
179 .resource = "MB",
180 .vendor_specific = ARCH_INTEL,
181 .feature_check = mbm_feature_check,
182 .run_test = mbm_run_test,
183 .cleanup = mbm_test_cleanup,
184};