summaryrefslogtreecommitdiff
path: root/tools/testing/selftests/resctrl/cat_test.c
blob: 224ba8544d8afc88910b01e77e77a35c8e2cfdc2 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
// SPDX-License-Identifier: GPL-2.0
/*
 * Cache Allocation Technology (CAT) test
 *
 * Copyright (C) 2018 Intel Corporation
 *
 * Authors:
 *    Sai Praneeth Prakhya <sai.praneeth.prakhya@intel.com>,
 *    Fenghua Yu <fenghua.yu@intel.com>
 */
#include "resctrl.h"
#include <unistd.h>

#define RESULT_FILE_NAME1	"result_cat1"
#define RESULT_FILE_NAME2	"result_cat2"
#define NUM_OF_RUNS		5
#define MAX_DIFF_PERCENT	4
#define MAX_DIFF		1000000

/*
 * Change schemata. Write schemata to specified
 * con_mon grp, mon_grp in resctrl FS.
 * Run 5 times in order to get average values.
 */
static int cat_setup(struct resctrl_val_param *p)
{
	char schemata[64];
	int ret = 0;

	/* Run NUM_OF_RUNS times */
	if (p->num_of_runs >= NUM_OF_RUNS)
		return END_OF_TESTS;

	if (p->num_of_runs == 0) {
		sprintf(schemata, "%lx", p->mask);
		ret = write_schemata(p->ctrlgrp, schemata, p->cpu_no,
				     p->resctrl_val);
	}
	p->num_of_runs++;

	return ret;
}

static int check_results(struct resctrl_val_param *param, size_t span)
{
	char *token_array[8], temp[512];
	unsigned long sum_llc_perf_miss = 0;
	int runs = 0, no_of_bits = 0;
	FILE *fp;

	ksft_print_msg("Checking for pass/fail\n");
	fp = fopen(param->filename, "r");
	if (!fp) {
		perror("# Cannot open file");

		return errno;
	}

	while (fgets(temp, sizeof(temp), fp)) {
		char *token = strtok(temp, ":\t");
		int fields = 0;

		while (token) {
			token_array[fields++] = token;
			token = strtok(NULL, ":\t");
		}
		/*
		 * Discard the first value which is inaccurate due to monitoring
		 * setup transition phase.
		 */
		if (runs > 0)
			sum_llc_perf_miss += strtoul(token_array[3], NULL, 0);
		runs++;
	}

	fclose(fp);
	no_of_bits = count_bits(param->mask);

	return show_cache_info(sum_llc_perf_miss, no_of_bits, span / 64,
			       MAX_DIFF, MAX_DIFF_PERCENT, runs - 1,
			       get_vendor() == ARCH_INTEL, false);
}

void cat_test_cleanup(void)
{
	remove(RESULT_FILE_NAME1);
	remove(RESULT_FILE_NAME2);
}

int cat_perf_miss_val(int cpu_no, int n, char *cache_type)
{
	unsigned long l_mask, l_mask_1;
	int ret, pipefd[2], sibling_cpu_no;
	unsigned long cache_size = 0;
	unsigned long long_mask;
	char cbm_mask[256];
	int count_of_bits;
	char pipe_message;
	size_t span;

	/* Get default cbm mask for L3/L2 cache */
	ret = get_cbm_mask(cache_type, cbm_mask);
	if (ret)
		return ret;

	long_mask = strtoul(cbm_mask, NULL, 16);

	/* Get L3/L2 cache size */
	ret = get_cache_size(cpu_no, cache_type, &cache_size);
	if (ret)
		return ret;
	ksft_print_msg("Cache size :%lu\n", cache_size);

	/* Get max number of bits from default-cabm mask */
	count_of_bits = count_bits(long_mask);

	if (!n)
		n = count_of_bits / 2;

	if (n > count_of_bits - 1) {
		ksft_print_msg("Invalid input value for no_of_bits n!\n");
		ksft_print_msg("Please enter value in range 1 to %d\n",
			       count_of_bits - 1);
		return -1;
	}

	/* Get core id from same socket for running another thread */
	sibling_cpu_no = get_core_sibling(cpu_no);
	if (sibling_cpu_no < 0)
		return -1;

	struct resctrl_val_param param = {
		.resctrl_val	= CAT_STR,
		.cpu_no		= cpu_no,
		.setup		= cat_setup,
	};

	l_mask = long_mask >> n;
	l_mask_1 = ~l_mask & long_mask;

	/* Set param values for parent thread which will be allocated bitmask
	 * with (max_bits - n) bits
	 */
	span = cache_size * (count_of_bits - n) / count_of_bits;
	strcpy(param.ctrlgrp, "c2");
	strcpy(param.mongrp, "m2");
	strcpy(param.filename, RESULT_FILE_NAME2);
	param.mask = l_mask;
	param.num_of_runs = 0;

	if (pipe(pipefd)) {
		perror("# Unable to create pipe");
		return errno;
	}

	fflush(stdout);
	bm_pid = fork();

	/* Set param values for child thread which will be allocated bitmask
	 * with n bits
	 */
	if (bm_pid == 0) {
		param.mask = l_mask_1;
		strcpy(param.ctrlgrp, "c1");
		strcpy(param.mongrp, "m1");
		span = cache_size * n / count_of_bits;
		strcpy(param.filename, RESULT_FILE_NAME1);
		param.num_of_runs = 0;
		param.cpu_no = sibling_cpu_no;
	}

	remove(param.filename);

	ret = cat_val(&param, span);
	if (ret == 0)
		ret = check_results(&param, span);

	if (bm_pid == 0) {
		/* Tell parent that child is ready */
		close(pipefd[0]);
		pipe_message = 1;
		if (write(pipefd[1], &pipe_message, sizeof(pipe_message)) <
		    sizeof(pipe_message))
			/*
			 * Just print the error message.
			 * Let while(1) run and wait for itself to be killed.
			 */
			perror("# failed signaling parent process");

		close(pipefd[1]);
		while (1)
			;
	} else {
		/* Parent waits for child to be ready. */
		close(pipefd[1]);
		pipe_message = 0;
		while (pipe_message != 1) {
			if (read(pipefd[0], &pipe_message,
				 sizeof(pipe_message)) < sizeof(pipe_message)) {
				perror("# failed reading from child process");
				break;
			}
		}
		close(pipefd[0]);
		kill(bm_pid, SIGKILL);
	}

	cat_test_cleanup();

	return ret;
}