kernel/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         { },
  22 };
  23
  24 static void print_wrong_arg_exit(void)
  25 {
  26         printf(_("invalid or unknown argument\n"));
  27         exit(EXIT_FAILURE);
  28 }
  29
  30 int cmd_info(int argc, char **argv)
  31 {
  32         extern char *optarg;
  33         extern int optind, opterr, optopt;
  34         unsigned int cpu;
  35
  36         union {
  37                 struct {
  38                         int perf_bias:1;
  39                 };
  40                 int params;
  41         } params = {};
  42         int ret = 0;
  43
  44         setlocale(LC_ALL, "");
  45         textdomain(PACKAGE);
  46
  47         /* parameter parsing */
  48         while ((ret = getopt_long(argc, argv, "b", set_opts, NULL)) != -1) {
  49                 switch (ret) {
  50                 case 'b':
  51                         if (params.perf_bias)
  52                                 print_wrong_arg_exit();
  53                         params.perf_bias = 1;
  54                         break;
  55                 default:
  56                         print_wrong_arg_exit();
  57                 }
  58         };
  59
  60         if (!params.params)
  61                 params.params = 0x7;
  62
  63         /* Default is: show output of CPU 0 only */
  64         if (bitmask_isallclear(cpus_chosen))
  65                 bitmask_setbit(cpus_chosen, 0);
  66
  67         /* Add more per cpu options here */
  68         if (!params.perf_bias)
  69                 return ret;
  70
  71         if (params.perf_bias) {
  72                 if (!run_as_root) {
  73                         params.perf_bias = 0;
  74                         printf(_("Intel's performance bias setting needs root privileges\n"));
  75                 } else if (!(cpupower_cpu_info.caps & CPUPOWER_CAP_PERF_BIAS)) {
  76                         printf(_("System does not support Intel's performance"
  77                                  " bias setting\n"));
  78                         params.perf_bias = 0;
  79                 }
  80         }
  81
  82         /* loop over CPUs */
  83         for (cpu = bitmask_first(cpus_chosen);
  84              cpu <= bitmask_last(cpus_chosen); cpu++) {
  85
  86                 if (!bitmask_isbitset(cpus_chosen, cpu) ||
  87                     cpufreq_cpu_exists(cpu))
  88                         continue;
  89
  90                 printf(_("analyzing CPU %d:\n"), cpu);
  91
  92                 if (params.perf_bias) {
  93                         ret = msr_intel_get_perf_bias(cpu);
  94                         if (ret < 0) {
  95                                 fprintf(stderr,
  96                         _("Could not read perf-bias value[%d]\n"), ret);
  97                                 exit(EXIT_FAILURE);
  98                         } else
  99                                 printf(_("perf-bias: %d\n"), ret);
 100                 }
 101         }
 102         return 0;
 103 }