kernel/tools/power/cpupower/utils/cpuidle-info.c

   1 /*
   2  *  (C) 2004-2009  Dominik Brodowski <linux@dominikbrodowski.de>
   3  *  (C) 2010       Thomas Renninger <trenn@suse.de>
   4  *
   5  *  Licensed under the terms of the GNU GPL License version 2.
   6  */
   7
   8
   9 #include <unistd.h>
  10 #include <stdio.h>
  11 #include <errno.h>
  12 #include <stdlib.h>
  13 #include <string.h>
  14 #include <getopt.h>
  15 #include <cpufreq.h>
  16
  17 #include "helpers/helpers.h"
  18 #include "helpers/sysfs.h"
  19 #include "helpers/bitmask.h"
  20
  21 #define LINE_LEN 10
  22
  23 static void cpuidle_cpu_output(unsigned int cpu, int verbose)
  24 {
  25         unsigned int idlestates, idlestate;
  26         char *tmp;
  27
  28         printf(_ ("Analyzing CPU %d:\n"), cpu);
  29
  30         idlestates = sysfs_get_idlestate_count(cpu);
  31         if (idlestates == 0) {
  32                 printf(_("CPU %u: No idle states\n"), cpu);
  33                 return;
  34         }
  35
  36         printf(_("Number of idle states: %d\n"), idlestates);
  37         printf(_("Available idle states:"));
  38         for (idlestate = 0; idlestate < idlestates; idlestate++) {
  39                 tmp = sysfs_get_idlestate_name(cpu, idlestate);
  40                 if (!tmp)
  41                         continue;
  42                 printf(" %s", tmp);
  43                 free(tmp);
  44         }
  45         printf("\n");
  46
  47         if (!verbose)
  48                 return;
  49
  50         for (idlestate = 0; idlestate < idlestates; idlestate++) {
  51                 int disabled = sysfs_is_idlestate_disabled(cpu, idlestate);
  52                 /* Disabled interface not supported on older kernels */
  53                 if (disabled < 0)
  54                         disabled = 0;
  55                 tmp = sysfs_get_idlestate_name(cpu, idlestate);
  56                 if (!tmp)
  57                         continue;
  58                 printf("%s%s:\n", tmp, (disabled) ? " (DISABLED) " : "");
  59                 free(tmp);
  60
  61                 tmp = sysfs_get_idlestate_desc(cpu, idlestate);
  62                 if (!tmp)
  63                         continue;
  64                 printf(_("Flags/Description: %s\n"), tmp);
  65                 free(tmp);
  66
  67                 printf(_("Latency: %lu\n"),
  68                        sysfs_get_idlestate_latency(cpu, idlestate));
  69                 printf(_("Usage: %lu\n"),
  70                        sysfs_get_idlestate_usage(cpu, idlestate));
  71                 printf(_("Duration: %llu\n"),
  72                        sysfs_get_idlestate_time(cpu, idlestate));
  73         }
  74         printf("\n");
  75 }
  76
  77 static void cpuidle_general_output(void)
  78 {
  79         char *tmp;
  80
  81         tmp = sysfs_get_cpuidle_driver();
  82         if (!tmp) {
  83                 printf(_("Could not determine cpuidle driver\n"));
  84                 return;
  85         }
  86
  87         printf(_("CPUidle driver: %s\n"), tmp);
  88         free(tmp);
  89
  90         tmp = sysfs_get_cpuidle_governor();
  91         if (!tmp) {
  92                 printf(_("Could not determine cpuidle governor\n"));
  93                 return;
  94         }
  95
  96         printf(_("CPUidle governor: %s\n"), tmp);
  97         free(tmp);
  98 }
  99
 100 static void proc_cpuidle_cpu_output(unsigned int cpu)
 101 {
 102         long max_allowed_cstate = 2000000000;
 103         unsigned int cstate, cstates;
 104
 105         cstates = sysfs_get_idlestate_count(cpu);
 106         if (cstates == 0) {
 107                 printf(_("CPU %u: No C-states info\n"), cpu);
 108                 return;
 109         }
 110
 111         printf(_("active state:            C0\n"));
 112         printf(_("max_cstate:              C%u\n"), cstates-1);
 113         printf(_("maximum allowed latency: %lu usec\n"), max_allowed_cstate);
 114         printf(_("states:\t\n"));
 115         for (cstate = 1; cstate < cstates; cstate++) {
 116                 printf(_("    C%d:                  "
 117                          "type[C%d] "), cstate, cstate);
 118                 printf(_("promotion[--] demotion[--] "));
 119                 printf(_("latency[%03lu] "),
 120                        sysfs_get_idlestate_latency(cpu, cstate));
 121                 printf(_("usage[%08lu] "),
 122                        sysfs_get_idlestate_usage(cpu, cstate));
 123                 printf(_("duration[%020Lu] \n"),
 124                        sysfs_get_idlestate_time(cpu, cstate));
 125         }
 126 }
 127
 128 static struct option info_opts[] = {
 129         { .name = "silent",     .has_arg = no_argument, .flag = NULL,   .val = 's'},
 130         { .name = "proc",       .has_arg = no_argument, .flag = NULL,   .val = 'o'},
 131         { },
 132 };
 133
 134 static inline void cpuidle_exit(int fail)
 135 {
 136         exit(EXIT_FAILURE);
 137 }
 138
 139 int cmd_idle_info(int argc, char **argv)
 140 {
 141         extern char *optarg;
 142         extern int optind, opterr, optopt;
 143         int ret = 0, cont = 1, output_param = 0, verbose = 1;
 144         unsigned int cpu = 0;
 145
 146         do {
 147                 ret = getopt_long(argc, argv, "os", info_opts, NULL);
 148                 if (ret == -1)
 149                         break;
 150                 switch (ret) {
 151                 case '?':
 152                         output_param = '?';
 153                         cont = 0;
 154                         break;
 155                 case 's':
 156                         verbose = 0;
 157                         break;
 158                 case -1:
 159                         cont = 0;
 160                         break;
 161                 case 'o':
 162                         if (output_param) {
 163                                 output_param = -1;
 164                                 cont = 0;
 165                                 break;
 166                         }
 167                         output_param = ret;
 168                         break;
 169                 }
 170         } while (cont);
 171
 172         switch (output_param) {
 173         case -1:
 174                 printf(_("You can't specify more than one "
 175                          "output-specific argument\n"));
 176                 cpuidle_exit(EXIT_FAILURE);
 177         case '?':
 178                 printf(_("invalid or unknown argument\n"));
 179                 cpuidle_exit(EXIT_FAILURE);
 180         }
 181
 182         /* Default is: show output of CPU 0 only */
 183         if (bitmask_isallclear(cpus_chosen))
 184                 bitmask_setbit(cpus_chosen, 0);
 185
 186         if (output_param == 0)
 187                 cpuidle_general_output();
 188
 189         for (cpu = bitmask_first(cpus_chosen);
 190              cpu <= bitmask_last(cpus_chosen); cpu++) {
 191
 192                 if (!bitmask_isbitset(cpus_chosen, cpu) ||
 193                     cpufreq_cpu_exists(cpu))
 194                         continue;
 195
 196                 switch (output_param) {
 197
 198                 case 'o':
 199                         proc_cpuidle_cpu_output(cpu);
 200                         break;
 201                 case 0:
 202                         printf("\n");
 203                         cpuidle_cpu_output(cpu, verbose);
 204                         break;
 205                 }
 206         }
 207         return EXIT_SUCCESS;
 208 }