cpupower: use man(1) when calling "cpupower help subcommand"
[linux-2.6.git] / tools / power / cpupower / utils / cpupower-info.c
1 /*
2  *  (C) 2011 Thomas Renninger <trenn@suse.de>, Novell Inc.
3  *
4  *  Licensed under the terms of the GNU GPL License version 2.
5  */
6
7
8 #include <unistd.h>
9 #include <stdio.h>
10 #include <stdlib.h>
11 #include <errno.h>
12 #include <string.h>
13 #include <getopt.h>
14
15 #include <cpufreq.h>
16 #include "helpers/helpers.h"
17 #include "helpers/sysfs.h"
18
19 static struct option set_opts[] = {
20         { .name = "perf-bias",  .has_arg = optional_argument,   .flag = NULL,   .val = 'b'},
21         { .name = "sched-mc",   .has_arg = optional_argument,   .flag = NULL,   .val = 'm'},
22         { .name = "sched-smt",  .has_arg = optional_argument,   .flag = NULL,   .val = 's'},
23         { },
24 };
25
26 static void print_wrong_arg_exit(void)
27 {
28         printf(_("invalid or unknown argument\n"));
29         exit(EXIT_FAILURE);
30 }
31
32 int cmd_info(int argc, char **argv)
33 {
34         extern char *optarg;
35         extern int optind, opterr, optopt;
36         unsigned int cpu;
37
38         union {
39                 struct {
40                         int sched_mc:1;
41                         int sched_smt:1;
42                         int perf_bias:1;
43                 };
44                 int params;
45         } params = {};
46         int ret = 0;
47
48         setlocale(LC_ALL, "");
49         textdomain(PACKAGE);
50
51         /* parameter parsing */
52         while ((ret = getopt_long(argc, argv, "msb", set_opts, NULL)) != -1) {
53                 switch (ret) {
54                 case 'b':
55                         if (params.perf_bias)
56                                 print_wrong_arg_exit();
57                         params.perf_bias = 1;
58                         break;
59                 case 'm':
60                         if (params.sched_mc)
61                                 print_wrong_arg_exit();
62                         params.sched_mc = 1;
63                         break;
64                 case 's':
65                         if (params.sched_smt)
66                                 print_wrong_arg_exit();
67                         params.sched_smt = 1;
68                         break;
69                 default:
70                         print_wrong_arg_exit();
71                 }
72         };
73
74         if (!params.params)
75                 params.params = 0x7;
76
77         /* Default is: show output of CPU 0 only */
78         if (bitmask_isallclear(cpus_chosen))
79                 bitmask_setbit(cpus_chosen, 0);
80
81         if (params.sched_mc) {
82                 ret = sysfs_get_sched("mc");
83                 printf(_("System's multi core scheduler setting: "));
84                 if (ret < 0)
85                         /* if sysfs file is missing it's: errno == ENOENT */
86                         printf(_("not supported\n"));
87                 else
88                         printf("%d\n", ret);
89         }
90         if (params.sched_smt) {
91                 ret = sysfs_get_sched("smt");
92                 printf(_("System's thread sibling scheduler setting: "));
93                 if (ret < 0)
94                         /* if sysfs file is missing it's: errno == ENOENT */
95                         printf(_("not supported\n"));
96                 else
97                         printf("%d\n", ret);
98         }
99
100         /* Add more per cpu options here */
101         if (!params.perf_bias)
102                 return ret;
103
104         if (params.perf_bias) {
105                 if (!run_as_root) {
106                         params.perf_bias = 0;
107                         printf(_("Intel's performance bias setting needs root privileges\n"));
108                 } else if (!(cpupower_cpu_info.caps & CPUPOWER_CAP_PERF_BIAS)) {
109                         printf(_("System does not support Intel's performance"
110                                  " bias setting\n"));
111                         params.perf_bias = 0;
112                 }
113         }
114
115         /* loop over CPUs */
116         for (cpu = bitmask_first(cpus_chosen);
117              cpu <= bitmask_last(cpus_chosen); cpu++) {
118
119                 if (!bitmask_isbitset(cpus_chosen, cpu) ||
120                     cpufreq_cpu_exists(cpu))
121                         continue;
122
123                 printf(_("analyzing CPU %d:\n"), cpu);
124
125                 if (params.perf_bias) {
126                         ret = msr_intel_get_perf_bias(cpu);
127                         if (ret < 0) {
128                                 printf(_("Could not read perf-bias value\n"));
129                                 break;
130                         } else
131                                 printf(_("perf-bias: %d\n"), ret);
132                 }
133         }
134         return ret;
135 }