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

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  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 }
 96 

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