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

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  *  (C) 2004-2009  Dominik Brodowski <linux@dominikbrodowski.de>
   4  *  (C) 2010       Thomas Renninger <trenn@suse.de>
   5  */
   6
   7
   8 #include <unistd.h>
   9 #include <stdio.h>
  10 #include <errno.h>
  11 #include <stdlib.h>
  12 #include <string.h>
  13 #include <getopt.h>
  14
  15 #include <cpuidle.h>
  16
  17 #include "helpers/sysfs.h"
  18 #include "helpers/helpers.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         idlestates = cpuidle_state_count(cpu);
  29         if (idlestates == 0) {
  30                 printf(_("CPU %u: No idle states\n"), cpu);
  31                 return;
  32         }
  33
  34         printf(_("Number of idle states: %d\n"), idlestates);
  35         printf(_("Available idle states:"));
  36         for (idlestate = 0; idlestate < idlestates; idlestate++) {
  37                 tmp = cpuidle_state_name(cpu, idlestate);
  38                 if (!tmp)
  39                         continue;
  40                 printf(" %s", tmp);
  41                 free(tmp);
  42         }
  43         printf("\n");
  44
  45         if (!verbose)
  46                 return;
  47
  48         for (idlestate = 0; idlestate < idlestates; idlestate++) {
  49                 int disabled = cpuidle_is_state_disabled(cpu, idlestate);
  50                 /* Disabled interface not supported on older kernels */
  51                 if (disabled < 0)
  52                         disabled = 0;
  53                 tmp = cpuidle_state_name(cpu, idlestate);
  54                 if (!tmp)
  55                         continue;
  56                 printf("%s%s:\n", tmp, (disabled) ? " (DISABLED) " : "");
  57                 free(tmp);
  58
  59                 tmp = cpuidle_state_desc(cpu, idlestate);
  60                 if (!tmp)
  61                         continue;
  62                 printf(_("Flags/Description: %s\n"), tmp);
  63                 free(tmp);
  64
  65                 printf(_("Latency: %lu\n"),
  66                        cpuidle_state_latency(cpu, idlestate));
  67                 printf(_("Usage: %lu\n"),
  68                        cpuidle_state_usage(cpu, idlestate));
  69                 printf(_("Duration: %llu\n"),
  70                        cpuidle_state_time(cpu, idlestate));
  71         }
  72 }
  73
  74 static void cpuidle_general_output(void)
  75 {
  76         char *tmp;
  77
  78         tmp = cpuidle_get_driver();
  79         if (!tmp) {
  80                 printf(_("Could not determine cpuidle driver\n"));
  81                 return;
  82         }
  83
  84         printf(_("CPUidle driver: %s\n"), tmp);
  85         free(tmp);
  86
  87         tmp = cpuidle_get_governor();
  88         if (!tmp) {
  89                 printf(_("Could not determine cpuidle governor\n"));
  90                 return;
  91         }
  92
  93         printf(_("CPUidle governor: %s\n"), tmp);
  94         free(tmp);
  95 }
  96
  97 static void proc_cpuidle_cpu_output(unsigned int cpu)
  98 {
  99         long max_allowed_cstate = 2000000000;
 100         unsigned int cstate, cstates;
 101
 102         cstates = cpuidle_state_count(cpu);
 103         if (cstates == 0) {
 104                 printf(_("CPU %u: No C-states info\n"), cpu);
 105                 return;
 106         }
 107
 108         printf(_("active state:            C0\n"));
 109         printf(_("max_cstate:              C%u\n"), cstates-1);
 110         printf(_("maximum allowed latency: %lu usec\n"), max_allowed_cstate);
 111         printf(_("states:\t\n"));
 112         for (cstate = 1; cstate < cstates; cstate++) {
 113                 printf(_("    C%d:                  "
 114                          "type[C%d] "), cstate, cstate);
 115                 printf(_("promotion[--] demotion[--] "));
 116                 printf(_("latency[%03lu] "),
 117                        cpuidle_state_latency(cpu, cstate));
 118                 printf(_("usage[%08lu] "),
 119                        cpuidle_state_usage(cpu, cstate));
 120                 printf(_("duration[%020Lu] \n"),
 121                        cpuidle_state_time(cpu, cstate));
 122         }
 123 }
 124
 125 static struct option info_opts[] = {
 126         {"silent", no_argument, NULL, 's'},
 127         {"proc", no_argument, NULL, 'o'},
 128         { },
 129 };
 130
 131 static inline void cpuidle_exit(int fail)
 132 {
 133         exit(EXIT_FAILURE);
 134 }
 135
 136 int cmd_idle_info(int argc, char **argv)
 137 {
 138         extern char *optarg;
 139         extern int optind, opterr, optopt;
 140         int ret = 0, cont = 1, output_param = 0, verbose = 1;
 141         unsigned int cpu = 0;
 142
 143         do {
 144                 ret = getopt_long(argc, argv, "os", info_opts, NULL);
 145                 if (ret == -1)
 146                         break;
 147                 switch (ret) {
 148                 case '?':
 149                         output_param = '?';
 150                         cont = 0;
 151                         break;
 152                 case 's':
 153                         verbose = 0;
 154                         break;
 155                 case -1:
 156                         cont = 0;
 157                         break;
 158                 case 'o':
 159                         if (output_param) {
 160                                 output_param = -1;
 161                                 cont = 0;
 162                                 break;
 163                         }
 164                         output_param = ret;
 165                         break;
 166                 }
 167         } while (cont);
 168
 169         switch (output_param) {
 170         case -1:
 171                 printf(_("You can't specify more than one "
 172                          "output-specific argument\n"));
 173                 cpuidle_exit(EXIT_FAILURE);
 174         case '?':
 175                 printf(_("invalid or unknown argument\n"));
 176                 cpuidle_exit(EXIT_FAILURE);
 177         }
 178
 179         /* Default is: show output of CPU 0 only */
 180         if (bitmask_isallclear(cpus_chosen))
 181                 bitmask_setbit(cpus_chosen, 0);
 182
 183         if (output_param == 0)
 184                 cpuidle_general_output();
 185
 186         for (cpu = bitmask_first(cpus_chosen);
 187              cpu <= bitmask_last(cpus_chosen); cpu++) {
 188
 189                 if (!bitmask_isbitset(cpus_chosen, cpu))
 190                         continue;
 191
 192                 printf(_("analyzing CPU %d:\n"), cpu);
 193
 194                 if (sysfs_is_cpu_online(cpu) != 1) {
 195                         printf(_(" *is offline\n"));
 196                         printf("\n");
 197                         continue;
 198                 }
 199
 200                 switch (output_param) {
 201
 202                 case 'o':
 203                         proc_cpuidle_cpu_output(cpu);
 204                         break;
 205                 case 0:
 206                         printf("\n");
 207                         cpuidle_cpu_output(cpu, verbose);
 208                         break;
 209                 }
 210                 printf("\n");
 211         }
 212         return EXIT_SUCCESS;
 213 }