cpupowerutils - cpufrequtils extended with quite some features
[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 void info_help(void)
20 {
21         printf(_("Usage: cpupower info [ -b ] [ -m ] [ -s ]\n"));
22         printf(_("Options:\n"));
23         printf(_("  -b, --perf-bias    Gets CPU's power vs performance policy on some\n"
24                "                           Intel models [0-15], see manpage for details\n"));
25         printf(_("  -m, --sched-mc     Gets the kernel's multi core scheduler policy.\n"));
26         printf(_("  -s, --sched-smt    Gets the kernel's thread sibling scheduler policy.\n"));
27         printf(_("  -h, --help               Prints out this screen\n"));
28         printf(_("\nPassing no option will show all info, by default only on core 0\n"));
29         printf("\n");
30 }
31
32 static struct option set_opts[] = {
33         { .name="perf-bias",    .has_arg=optional_argument,     .flag=NULL,     .val='b'},
34         { .name="sched-mc",     .has_arg=optional_argument,     .flag=NULL,     .val='m'},
35         { .name="sched-smt",    .has_arg=optional_argument,     .flag=NULL,     .val='s'},
36         { .name="help",         .has_arg=no_argument,           .flag=NULL,     .val='h'},
37         { },
38 };
39
40 static void print_wrong_arg_exit(void)
41 {
42         printf(_("invalid or unknown argument\n"));
43         info_help();
44         exit(EXIT_FAILURE);
45 }
46
47 int cmd_info(int argc, char **argv)
48 {
49         extern char *optarg;
50         extern int optind, opterr, optopt;
51         unsigned int cpu;
52
53         union {
54                 struct {
55                         int sched_mc:1;
56                         int sched_smt:1;
57                         int perf_bias:1;
58                 };
59                 int params;
60                         
61         } params = {};
62         int ret = 0;
63
64         setlocale(LC_ALL, "");
65         textdomain (PACKAGE);
66
67         /* parameter parsing */
68         while ((ret = getopt_long(argc, argv, "msbh", set_opts, NULL)) != -1) {
69                 switch (ret) {
70                 case 'h':
71                         info_help();
72                         return 0;
73                 case 'b':
74                         if (params.perf_bias)
75                                 print_wrong_arg_exit();
76                         params.perf_bias = 1;
77                         break;
78                 case 'm':
79                         if (params.sched_mc)
80                                 print_wrong_arg_exit();
81                         params.sched_mc = 1;
82                         break;
83                 case 's':
84                         if (params.sched_smt)
85                                 print_wrong_arg_exit();
86                         params.sched_smt = 1;
87                         break;
88                 default:
89                         print_wrong_arg_exit();
90                 }
91         };
92
93         if (!params.params)
94                 params.params = 0x7;
95
96         /* Default is: show output of CPU 0 only */
97         if (bitmask_isallclear(cpus_chosen))
98                 bitmask_setbit(cpus_chosen, 0);
99
100         if (params.sched_mc) {
101                 ret = sysfs_get_sched("mc");
102                 printf(_("System's multi core scheduler setting: "));
103                 if (ret < 0)
104                         /* if sysfs file is missing it's: errno == ENOENT */
105                         printf(_("not supported\n"));
106                 else
107                         printf("%d\n", ret);
108         }                       
109         if (params.sched_smt) {
110                 ret = sysfs_get_sched("smt");
111                 printf(_("System's thread sibling scheduler setting: "));
112                 if (ret < 0)
113                         /* if sysfs file is missing it's: errno == ENOENT */
114                         printf(_("not supported\n"));
115                 else
116                         printf("%d\n", ret);
117         }
118
119         /* Add more per cpu options here */
120         if (!params.perf_bias)
121                 return ret;
122
123         if (params.perf_bias) {
124                 if (!run_as_root) {
125                         params.perf_bias = 0;
126                         printf (_("Intel's performance bias setting needs root privileges\n"));
127                 } else if (!(cpupower_cpu_info.caps & CPUPOWER_CAP_PERF_BIAS)) {
128                         printf(_("System does not support Intel's performance"
129                                  " bias setting\n"));
130                         params.perf_bias = 0;
131                 }
132         }
133
134         /* loop over CPUs */
135         for (cpu = bitmask_first(cpus_chosen);
136              cpu <= bitmask_last(cpus_chosen); cpu++) {
137                 
138                 if (!bitmask_isbitset(cpus_chosen, cpu) ||
139                     cpufreq_cpu_exists(cpu))
140                         continue;
141
142                 printf(_("analyzing CPU %d:\n"), cpu);
143
144                 if (params.perf_bias) {
145                         ret = msr_intel_get_perf_bias(cpu);
146                         if (ret < 0) {
147                                 printf(_("Could not read perf-bias value\n"));
148                                 break;
149                         } else
150                                 printf(_("perf-bias: %d\n"), ret);
151                 }
152         }
153         return ret;
154 }