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 }