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
  19 static 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
  26 static void print_wrong_arg_exit(void)
  27 {
  28         printf(_("invalid or unknown argument\n"));
  29         exit(EXIT_FAILURE);
  30 }
  31
  32 int 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 }