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 #include <sys/utsname.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         struct utsname uts;
  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         ret = uname(&uts);
  47         if (!ret && (!strcmp(uts.machine, "ppc64le") ||
  48                      !strcmp(uts.machine, "ppc64"))) {
  49                 fprintf(stderr, _("Subcommand not supported on POWER.\n"));
  50                 return ret;
  51         }
  52
  53         setlocale(LC_ALL, "");
  54         textdomain(PACKAGE);
  55
  56         params.params = 0;
  57         /* parameter parsing */
  58         while ((ret = getopt_long(argc, argv, "b:",
  59                                                 set_opts, NULL)) != -1) {
  60                 switch (ret) {
  61                 case 'b':
  62                         if (params.perf_bias)
  63                                 print_wrong_arg_exit();
  64                         perf_bias = atoi(optarg);
  65                         if (perf_bias < 0 || perf_bias > 15) {
  66                                 printf(_("--perf-bias param out "
  67                                          "of range [0-%d]\n"), 15);
  68                                 print_wrong_arg_exit();
  69                         }
  70                         params.perf_bias = 1;
  71                         break;
  72                 default:
  73                         print_wrong_arg_exit();
  74                 }
  75         }
  76
  77         if (!params.params)
  78                 print_wrong_arg_exit();
  79
  80         /* Default is: set all CPUs */
  81         if (bitmask_isallclear(cpus_chosen))
  82                 bitmask_setall(cpus_chosen);
  83
  84         /* loop over CPUs */
  85         for (cpu = bitmask_first(cpus_chosen);
  86              cpu <= bitmask_last(cpus_chosen); cpu++) {
  87
  88                 if (!bitmask_isbitset(cpus_chosen, cpu))
  89                         continue;
  90
  91                 if (sysfs_is_cpu_online(cpu) != 1){
  92                         fprintf(stderr, _("Cannot set values on CPU %d:"), cpu);
  93                         fprintf(stderr, _(" *is offline\n"));
  94                         continue;
  95                 }
  96
  97                 if (params.perf_bias) {
  98                         ret = cpupower_intel_set_perf_bias(cpu, perf_bias);
  99                         if (ret) {
 100                                 fprintf(stderr, _("Error setting perf-bias "
 101                                                   "value on CPU %d\n"), cpu);
 102                                 break;
 103                         }
 104                 }
 105         }
 106         return ret;
 107 }