summaryrefslogtreecommitdiff
path: root/tools/power/cpupower/utils/cpupower.c
blob: 8ac3304a9957d41d4f049ef1d928457c648e97da (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
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
// SPDX-License-Identifier: GPL-2.0-only
/*
 *  (C) 2010,2011       Thomas Renninger <trenn@suse.de>, Novell Inc.
 *
 *  Ideas taken over from the perf userspace tool (included in the Linus
 *  kernel git repo): subcommand builtins and param parsing.
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>
#include <sched.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/utsname.h>

#include "builtin.h"
#include "helpers/helpers.h"
#include "helpers/bitmask.h"

#define ARRAY_SIZE(x) (sizeof(x)/sizeof(x[0]))

static int cmd_help(int argc, const char **argv);

/* Global cpu_info object available for all binaries
 * Info only retrieved from CPU 0
 *
 * Values will be zero/unknown on non X86 archs
 */
struct cpupower_cpu_info cpupower_cpu_info;
int run_as_root;
int base_cpu;
/* Affected cpus chosen by -c/--cpu param */
struct bitmask *cpus_chosen;
struct bitmask *online_cpus;
struct bitmask *offline_cpus;

#ifdef DEBUG
int be_verbose;
#endif

static void print_help(void);

struct cmd_struct {
	const char *cmd;
	int (*main)(int, const char **);
	int needs_root;
};

static struct cmd_struct commands[] = {
	{ "frequency-info",	cmd_freq_info,	0	},
	{ "frequency-set",	cmd_freq_set,	1	},
	{ "idle-info",		cmd_idle_info,	0	},
	{ "idle-set",		cmd_idle_set,	1	},
	{ "set",		cmd_set,	1	},
	{ "info",		cmd_info,	0	},
	{ "monitor",		cmd_monitor,	0	},
	{ "help",		cmd_help,	0	},
	/*	{ "bench",	cmd_bench,	1	}, */
};

static void print_help(void)
{
	unsigned int i;

#ifdef DEBUG
	printf(_("Usage:\tcpupower [-d|--debug] [-c|--cpu cpulist ] <command> [<args>]\n"));
#else
	printf(_("Usage:\tcpupower [-c|--cpu cpulist ] <command> [<args>]\n"));
#endif
	printf(_("Supported commands are:\n"));
	for (i = 0; i < ARRAY_SIZE(commands); i++)
		printf("\t%s\n", commands[i].cmd);
	printf(_("\nNot all commands can make use of the -c cpulist option.\n"));
	printf(_("\nUse 'cpupower help <command>' for getting help for above commands.\n"));
}

static int print_man_page(const char *subpage)
{
	int len;
	char *page;

	len = 10; /* enough for "cpupower-" */
	if (subpage != NULL)
		len += strlen(subpage);

	page = malloc(len);
	if (!page)
		return -ENOMEM;

	sprintf(page, "cpupower");
	if ((subpage != NULL) && strcmp(subpage, "help")) {
		strcat(page, "-");
		strcat(page, subpage);
	}

	execlp("man", "man", page, NULL);

	/* should not be reached */
	return -EINVAL;
}

static int cmd_help(int argc, const char **argv)
{
	if (argc > 1) {
		print_man_page(argv[1]); /* exits within execlp() */
		return EXIT_FAILURE;
	}

	print_help();
	return EXIT_SUCCESS;
}

static void print_version(void)
{
	printf(PACKAGE " " VERSION "\n");
	printf(_("Report errors and bugs to %s, please.\n"), PACKAGE_BUGREPORT);
}

static void handle_options(int *argc, const char ***argv)
{
	int ret, x, new_argc = 0;

	if (*argc < 1)
		return;

	for (x = 0;  x < *argc && ((*argv)[x])[0] == '-'; x++) {
		const char *param = (*argv)[x];
		if (!strcmp(param, "-h") || !strcmp(param, "--help")) {
			print_help();
			exit(EXIT_SUCCESS);
		} else if (!strcmp(param, "-c") || !strcmp(param, "--cpu")) {
			if (*argc < 2) {
				print_help();
				exit(EXIT_FAILURE);
			}
			if (!strcmp((*argv)[x+1], "all"))
				bitmask_setall(cpus_chosen);
			else {
				ret = bitmask_parselist(
						(*argv)[x+1], cpus_chosen);
				if (ret < 0) {
					fprintf(stderr, _("Error parsing cpu "
							  "list\n"));
					exit(EXIT_FAILURE);
				}
			}
			x += 1;
			/* Cut out param: cpupower -c 1 info -> cpupower info */
			new_argc += 2;
			continue;
		} else if (!strcmp(param, "-v") ||
			!strcmp(param, "--version")) {
			print_version();
			exit(EXIT_SUCCESS);
#ifdef DEBUG
		} else if (!strcmp(param, "-d") || !strcmp(param, "--debug")) {
			be_verbose = 1;
			new_argc++;
			continue;
#endif
		} else {
			fprintf(stderr, "Unknown option: %s\n", param);
			print_help();
			exit(EXIT_FAILURE);
		}
	}
	*argc -= new_argc;
	*argv += new_argc;
}

int main(int argc, const char *argv[])
{
	const char *cmd;
	unsigned int i, ret;
	struct stat statbuf;
	struct utsname uts;
	char pathname[32];

	cpus_chosen = bitmask_alloc(sysconf(_SC_NPROCESSORS_CONF));
	online_cpus = bitmask_alloc(sysconf(_SC_NPROCESSORS_CONF));
	offline_cpus = bitmask_alloc(sysconf(_SC_NPROCESSORS_CONF));

	argc--;
	argv += 1;

	handle_options(&argc, &argv);

	cmd = argv[0];

	if (argc < 1) {
		print_help();
		return EXIT_FAILURE;
	}

	setlocale(LC_ALL, "");
	textdomain(PACKAGE);

	/* Turn "perf cmd --help" into "perf help cmd" */
	if (argc > 1 && !strcmp(argv[1], "--help")) {
		argv[1] = argv[0];
		argv[0] = cmd = "help";
	}

	base_cpu = sched_getcpu();
	if (base_cpu < 0) {
		fprintf(stderr, _("No valid cpus found.\n"));
		return EXIT_FAILURE;
	}

	get_cpu_info(&cpupower_cpu_info);
	run_as_root = !geteuid();
	if (run_as_root) {
		ret = uname(&uts);
		sprintf(pathname, "/dev/cpu/%d/msr", base_cpu);
		if (!ret && !strcmp(uts.machine, "x86_64") &&
		    stat(pathname, &statbuf) != 0) {
			if (system("modprobe msr") == -1)
	fprintf(stderr, _("MSR access not available.\n"));
		}
	}

	for (i = 0; i < ARRAY_SIZE(commands); i++) {
		struct cmd_struct *p = commands + i;
		if (strcmp(p->cmd, cmd))
			continue;
		if (!run_as_root && p->needs_root) {
			fprintf(stderr, _("Subcommand %s needs root "
					  "privileges\n"), cmd);
			return EXIT_FAILURE;
		}
		ret = p->main(argc, argv);
		if (cpus_chosen)
			bitmask_free(cpus_chosen);
		if (online_cpus)
			bitmask_free(online_cpus);
		if (offline_cpus)
			bitmask_free(offline_cpus);
		return ret;
	}
	print_help();
	return EXIT_FAILURE;
}