LXR linux/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
  18static struct option set_opts[] = {
  19        {"perf-bias", required_argument, NULL, 'b'},
  20        { },
  21};
  22
  23static void print_wrong_arg_exit(void)
  24{
  25        printf(_("invalid or unknown argument\n"));
  26        exit(EXIT_FAILURE);
  27}
  28
  29int 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}
  99