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         } params = {};
  61         int ret = 0;
  62
  63         setlocale(LC_ALL, "");
  64         textdomain(PACKAGE);
  65
  66         /* parameter parsing */
  67         while ((ret = getopt_long(argc, argv, "msbh", set_opts, NULL)) != -1) {
  68                 switch (ret) {
  69                 case 'h':
  70                         info_help();
  71                         return 0;
  72                 case 'b':
  73                         if (params.perf_bias)
  74                                 print_wrong_arg_exit();
  75                         params.perf_bias = 1;
  76                         break;
  77                 case 'm':
  78                         if (params.sched_mc)
  79                                 print_wrong_arg_exit();
  80                         params.sched_mc = 1;
  81                         break;
  82                 case 's':
  83                         if (params.sched_smt)
  84                                 print_wrong_arg_exit();
  85                         params.sched_smt = 1;
  86                         break;
  87                 default:
  88                         print_wrong_arg_exit();
  89                 }
  90         };
  91
  92         if (!params.params)
  93                 params.params = 0x7;
  94
  95         /* Default is: show output of CPU 0 only */
  96         if (bitmask_isallclear(cpus_chosen))
  97                 bitmask_setbit(cpus_chosen, 0);
  98
  99         if (params.sched_mc) {
 100                 ret = sysfs_get_sched("mc");
 101                 printf(_("System's multi core scheduler setting: "));
 102                 if (ret < 0)
 103                         /* if sysfs file is missing it's: errno == ENOENT */
 104                         printf(_("not supported\n"));
 105                 else
 106                         printf("%d\n", ret);
 107         }
 108         if (params.sched_smt) {
 109                 ret = sysfs_get_sched("smt");
 110                 printf(_("System's thread sibling scheduler setting: "));
 111                 if (ret < 0)
 112                         /* if sysfs file is missing it's: errno == ENOENT */
 113                         printf(_("not supported\n"));
 114                 else
 115                         printf("%d\n", ret);
 116         }
 117
 118         /* Add more per cpu options here */
 119         if (!params.perf_bias)
 120                 return ret;
 121
 122         if (params.perf_bias) {
 123                 if (!run_as_root) {
 124                         params.perf_bias = 0;
 125                         printf(_("Intel's performance bias setting needs root privileges\n"));
 126                 } else if (!(cpupower_cpu_info.caps & CPUPOWER_CAP_PERF_BIAS)) {
 127                         printf(_("System does not support Intel's performance"
 128                                  " bias setting\n"));
 129                         params.perf_bias = 0;
 130                 }
 131         }
 132
 133         /* loop over CPUs */
 134         for (cpu = bitmask_first(cpus_chosen);
 135              cpu <= bitmask_last(cpus_chosen); cpu++) {
 136
 137                 if (!bitmask_isbitset(cpus_chosen, cpu) ||
 138                     cpufreq_cpu_exists(cpu))
 139                         continue;
 140
 141                 printf(_("analyzing CPU %d:\n"), cpu);
 142
 143                 if (params.perf_bias) {
 144                         ret = msr_intel_get_perf_bias(cpu);
 145                         if (ret < 0) {
 146                                 printf(_("Could not read perf-bias value\n"));
 147                                 break;
 148                         } else
 149                                 printf(_("perf-bias: %d\n"), ret);
 150                 }
 151         }
 152         return ret;
 153 }