LXR linux/tools/power/cpupower/utils/cpupower-info.c

   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
  19static struct option set_opts[] = {
  20        { .name = "perf-bias",  .has_arg = optional_argument,   .flag = NULL,   .val = 'b'},
  21        { .name = "sched-mc",   .has_arg = optional_argument,   .flag = NULL,   .val = 'm'},
  22        { .name = "sched-smt",  .has_arg = optional_argument,   .flag = NULL,   .val = 's'},
  23        { },
  24};
  25
  26static void print_wrong_arg_exit(void)
  27{
  28        printf(_("invalid or unknown argument\n"));
  29        exit(EXIT_FAILURE);
  30}
  31
  32int cmd_info(int argc, char **argv)
  33{
  34        extern char *optarg;
  35        extern int optind, opterr, optopt;
  36        unsigned int cpu;
  37
  38        union {
  39                struct {
  40                        int sched_mc:1;
  41                        int sched_smt:1;
  42                        int perf_bias:1;
  43                };
  44                int params;
  45        } params = {};
  46        int ret = 0;
  47
  48        setlocale(LC_ALL, "");
  49        textdomain(PACKAGE);
  50
  51        /* parameter parsing */
  52        while ((ret = getopt_long(argc, argv, "msb", set_opts, NULL)) != -1) {
  53                switch (ret) {
  54                case 'b':
  55                        if (params.perf_bias)
  56                                print_wrong_arg_exit();
  57                        params.perf_bias = 1;
  58                        break;
  59                case 'm':
  60                        if (params.sched_mc)
  61                                print_wrong_arg_exit();
  62                        params.sched_mc = 1;
  63                        break;
  64                case 's':
  65                        if (params.sched_smt)
  66                                print_wrong_arg_exit();
  67                        params.sched_smt = 1;
  68                        break;
  69                default:
  70                        print_wrong_arg_exit();
  71                }
  72        };
  73
  74        if (!params.params)
  75                params.params = 0x7;
  76
  77        /* Default is: show output of CPU 0 only */
  78        if (bitmask_isallclear(cpus_chosen))
  79                bitmask_setbit(cpus_chosen, 0);
  80
  81        if (params.sched_mc) {
  82                ret = sysfs_get_sched("mc");
  83                printf(_("System's multi core scheduler setting: "));
  84                if (ret < 0)
  85                        /* if sysfs file is missing it's: errno == ENOENT */
  86                        printf(_("not supported\n"));
  87                else
  88                        printf("%d\n", ret);
  89        }
  90        if (params.sched_smt) {
  91                ret = sysfs_get_sched("smt");
  92                printf(_("System's thread sibling scheduler setting: "));
  93                if (ret < 0)
  94                        /* if sysfs file is missing it's: errno == ENOENT */
  95                        printf(_("not supported\n"));
  96                else
  97                        printf("%d\n", ret);
  98        }
  99
 100        /* Add more per cpu options here */
 101        if (!params.perf_bias)
 102                return ret;
 103
 104        if (params.perf_bias) {
 105                if (!run_as_root) {
 106                        params.perf_bias = 0;
 107                        printf(_("Intel's performance bias setting needs root privileges\n"));
 108                } else if (!(cpupower_cpu_info.caps & CPUPOWER_CAP_PERF_BIAS)) {
 109                        printf(_("System does not support Intel's performance"
 110                                 " bias setting\n"));
 111                        params.perf_bias = 0;
 112                }
 113        }
 114
 115        /* loop over CPUs */
 116        for (cpu = bitmask_first(cpus_chosen);
 117             cpu <= bitmask_last(cpus_chosen); cpu++) {
 118
 119                if (!bitmask_isbitset(cpus_chosen, cpu) ||
 120                    cpufreq_cpu_exists(cpu))
 121                        continue;
 122
 123                printf(_("analyzing CPU %d:\n"), cpu);
 124
 125                if (params.perf_bias) {
 126                        ret = msr_intel_get_perf_bias(cpu);
 127                        if (ret < 0) {
 128                                printf(_("Could not read perf-bias value\n"));
 129                                break;
 130                        } else
 131                                printf(_("perf-bias: %d\n"), ret);
 132                }
 133        }
 134        return ret;
 135}
 136