tools/power/cpupower/utils/cpupower-set.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  *  (C) 2011 Thomas Renninger <trenn@suse.de>, Novell Inc.
   4  */
   5
   6
   7 #include <unistd.h>
   8 #include <stdio.h>
   9 #include <stdlib.h>
  10 #include <errno.h>
  11 #include <string.h>
  12 #include <getopt.h>
  13
  14 #include "helpers/helpers.h"
  15 #include "helpers/sysfs.h"
  16 #include "helpers/bitmask.h"
  17
  18 static struct option set_opts[] = {
  19         {"perf-bias", required_argument, NULL, 'b'},
  20         { },
  21 };
  22
  23 static void print_wrong_arg_exit(void)
  24 {
  25         printf(_("invalid or unknown argument\n"));
  26         exit(EXIT_FAILURE);
  27 }
  28
  29 int cmd_set(int argc, char **argv)
  30 {
  31         extern char *optarg;
  32         extern int optind, opterr, optopt;
  33         unsigned int cpu;
  34
  35         union {
  36                 struct {
  37                         int perf_bias:1;
  38                 };
  39                 int params;
  40         } params;
  41         int perf_bias = 0;
  42         int ret = 0;
  43
  44         setlocale(LC_ALL, "");
  45         textdomain(PACKAGE);
  46
  47         params.params = 0;
  48         /* parameter parsing */
  49         while ((ret = getopt_long(argc, argv, "b:",
  50                                                 set_opts, NULL)) != -1) {
  51                 switch (ret) {
  52                 case 'b':
  53                         if (params.perf_bias)
  54                                 print_wrong_arg_exit();
  55                         perf_bias = atoi(optarg);
  56                         if (perf_bias < 0 || perf_bias > 15) {
  57                                 printf(_("--perf-bias param out "
  58                                          "of range [0-%d]\n"), 15);
  59                                 print_wrong_arg_exit();
  60                         }
  61                         params.perf_bias = 1;
  62                         break;
  63                 default:
  64                         print_wrong_arg_exit();
  65                 }
  66         };
  67
  68         if (!params.params)
  69                 print_wrong_arg_exit();
  70
  71         /* Default is: set all CPUs */
  72         if (bitmask_isallclear(cpus_chosen))
  73                 bitmask_setall(cpus_chosen);
  74
  75         /* loop over CPUs */
  76         for (cpu = bitmask_first(cpus_chosen);
  77              cpu <= bitmask_last(cpus_chosen); cpu++) {
  78
  79                 if (!bitmask_isbitset(cpus_chosen, cpu))
  80                         continue;
  81
  82                 if (sysfs_is_cpu_online(cpu) != 1){
  83                         fprintf(stderr, _("Cannot set values on CPU %d:"), cpu);
  84                         fprintf(stderr, _(" *is offline\n"));
  85                         continue;
  86                 }
  87
  88                 if (params.perf_bias) {
  89                         ret = msr_intel_set_perf_bias(cpu, perf_bias);
  90                         if (ret) {
  91                                 fprintf(stderr, _("Error setting perf-bias "
  92                                                   "value on CPU %d\n"), cpu);
  93                                 break;
  94                         }
  95                 }
  96         }
  97         return ret;
  98 }