LXR linux/tools/power/cpupower/utils/cpupower-info.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
  17static struct option set_opts[] = {
  18     {"perf-bias", optional_argument, NULL, 'b'},
  19     { },
  20};
  21
  22static void print_wrong_arg_exit(void)
  23{
  24        printf(_("invalid or unknown argument\n"));
  25        exit(EXIT_FAILURE);
  26}
  27
  28int cmd_info(int argc, char **argv)
  29{
  30        extern char *optarg;
  31        extern int optind, opterr, optopt;
  32        unsigned int cpu;
  33
  34        union {
  35                struct {
  36                        int perf_bias:1;
  37                };
  38                int params;
  39        } params = {};
  40        int ret = 0;
  41
  42        setlocale(LC_ALL, "");
  43        textdomain(PACKAGE);
  44
  45        /* parameter parsing */
  46        while ((ret = getopt_long(argc, argv, "b", set_opts, NULL)) != -1) {
  47                switch (ret) {
  48                case 'b':
  49                        if (params.perf_bias)
  50                                print_wrong_arg_exit();
  51                        params.perf_bias = 1;
  52                        break;
  53                default:
  54                        print_wrong_arg_exit();
  55                }
  56        };
  57
  58        if (!params.params)
  59                params.params = 0x7;
  60
  61        /* Default is: show output of CPU 0 only */
  62        if (bitmask_isallclear(cpus_chosen))
  63                bitmask_setbit(cpus_chosen, 0);
  64
  65        /* Add more per cpu options here */
  66        if (!params.perf_bias)
  67                return ret;
  68
  69        if (params.perf_bias) {
  70                if (!run_as_root) {
  71                        params.perf_bias = 0;
  72                        printf(_("Intel's performance bias setting needs root privileges\n"));
  73                } else if (!(cpupower_cpu_info.caps & CPUPOWER_CAP_PERF_BIAS)) {
  74                        printf(_("System does not support Intel's performance"
  75                                 " bias setting\n"));
  76                        params.perf_bias = 0;
  77                }
  78        }
  79
  80        /* loop over CPUs */
  81        for (cpu = bitmask_first(cpus_chosen);
  82             cpu <= bitmask_last(cpus_chosen); cpu++) {
  83
  84                if (!bitmask_isbitset(cpus_chosen, cpu))
  85                        continue;
  86
  87                printf(_("analyzing CPU %d:\n"), cpu);
  88
  89                if (sysfs_is_cpu_online(cpu) != 1){
  90                        printf(_(" *is offline\n"));
  91                        continue;
  92                }
  93
  94                if (params.perf_bias) {
  95                        ret = msr_intel_get_perf_bias(cpu);
  96                        if (ret < 0) {
  97                                fprintf(stderr,
  98                        _("Could not read perf-bias value[%d]\n"), ret);
  99                                exit(EXIT_FAILURE);
 100                        } else
 101                                printf(_("perf-bias: %d\n"), ret);
 102                }
 103        }
 104        return 0;
 105}
 106