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 "helpers/helpers.h"
  16 #include "helpers/sysfs.h"
  17 #include "helpers/bitmask.h"
  18
  19 static struct option set_opts[] = {
  20         {"perf-bias", required_argument, NULL, '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_set(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 perf_bias = 0;
  43         int ret = 0;
  44
  45         setlocale(LC_ALL, "");
  46         textdomain(PACKAGE);
  47
  48         params.params = 0;
  49         /* parameter parsing */
  50         while ((ret = getopt_long(argc, argv, "b:",
  51                                                 set_opts, NULL)) != -1) {
  52                 switch (ret) {
  53                 case 'b':
  54                         if (params.perf_bias)
  55                                 print_wrong_arg_exit();
  56                         perf_bias = atoi(optarg);
  57                         if (perf_bias < 0 || perf_bias > 15) {
  58                                 printf(_("--perf-bias param out "
  59                                          "of range [0-%d]\n"), 15);
  60                                 print_wrong_arg_exit();
  61                         }
  62                         params.perf_bias = 1;
  63                         break;
  64                 default:
  65                         print_wrong_arg_exit();
  66                 }
  67         };
  68
  69         if (!params.params)
  70                 print_wrong_arg_exit();
  71
  72         /* Default is: set all CPUs */
  73         if (bitmask_isallclear(cpus_chosen))
  74                 bitmask_setall(cpus_chosen);
  75
  76         /* loop over CPUs */
  77         for (cpu = bitmask_first(cpus_chosen);
  78              cpu <= bitmask_last(cpus_chosen); cpu++) {
  79
  80                 if (!bitmask_isbitset(cpus_chosen, cpu))
  81                         continue;
  82
  83                 if (sysfs_is_cpu_online(cpu) != 1){
  84                         fprintf(stderr, _("Cannot set values on CPU %d:"), cpu);
  85                         fprintf(stderr, _(" *is offline\n"));
  86                         continue;
  87                 }
  88
  89                 if (params.perf_bias) {
  90                         ret = msr_intel_set_perf_bias(cpu, perf_bias);
  91                         if (ret) {
  92                                 fprintf(stderr, _("Error setting perf-bias "
  93                                                   "value on CPU %d\n"), cpu);
  94                                 break;
  95                         }
  96                 }
  97         }
  98         return ret;
  99 }