kernel/tools/power/cpupower/utils/cpupower-set.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 #include "helpers/bitmask.h"
  19
  20 static struct option set_opts[] = {
  21         { .name = "perf-bias",  .has_arg = required_argument,   .flag = NULL,   .val = 'b'},
  22         { },
  23 };
  24
  25 static void print_wrong_arg_exit(void)
  26 {
  27         printf(_("invalid or unknown argument\n"));
  28         exit(EXIT_FAILURE);
  29 }
  30
  31 int cmd_set(int argc, char **argv)
  32 {
  33         extern char *optarg;
  34         extern int optind, opterr, optopt;
  35         unsigned int cpu;
  36
  37         union {
  38                 struct {
  39                         int perf_bias:1;
  40                 };
  41                 int params;
  42         } params;
  43         int perf_bias = 0;
  44         int ret = 0;
  45
  46         setlocale(LC_ALL, "");
  47         textdomain(PACKAGE);
  48
  49         params.params = 0;
  50         /* parameter parsing */
  51         while ((ret = getopt_long(argc, argv, "b:",
  52                                                 set_opts, NULL)) != -1) {
  53                 switch (ret) {
  54                 case 'b':
  55                         if (params.perf_bias)
  56                                 print_wrong_arg_exit();
  57                         perf_bias = atoi(optarg);
  58                         if (perf_bias < 0 || perf_bias > 15) {
  59                                 printf(_("--perf-bias param out "
  60                                          "of range [0-%d]\n"), 15);
  61                                 print_wrong_arg_exit();
  62                         }
  63                         params.perf_bias = 1;
  64                         break;
  65                 default:
  66                         print_wrong_arg_exit();
  67                 }
  68         };
  69
  70         if (!params.params)
  71                 print_wrong_arg_exit();
  72
  73         /* Default is: set all CPUs */
  74         if (bitmask_isallclear(cpus_chosen))
  75                 bitmask_setall(cpus_chosen);
  76
  77         /* loop over CPUs */
  78         for (cpu = bitmask_first(cpus_chosen);
  79              cpu <= bitmask_last(cpus_chosen); cpu++) {
  80
  81                 if (!bitmask_isbitset(cpus_chosen, cpu) ||
  82                     cpufreq_cpu_exists(cpu))
  83                         continue;
  84
  85                 if (params.perf_bias) {
  86                         ret = msr_intel_set_perf_bias(cpu, perf_bias);
  87                         if (ret) {
  88                                 fprintf(stderr, _("Error setting perf-bias "
  89                                                   "value on CPU %d\n"), cpu);
  90                                 break;
  91                         }
  92                 }
  93         }
  94         return ret;
  95 }