tools/power/cpupower/utils/cpupower.c

   1 /*
   2  *  (C) 2010,2011       Thomas Renninger <trenn@suse.de>, Novell Inc.
   3  *
   4  *  Licensed under the terms of the GNU GPL License version 2.
   5  *
   6  *  Ideas taken over from the perf userspace tool (included in the Linus
   7  *  kernel git repo): subcommand builtins and param parsing.
   8  */
   9
  10 #include <stdio.h>
  11 #include <stdlib.h>
  12 #include <string.h>
  13 #include <unistd.h>
  14
  15 #include "builtin.h"
  16 #include "helpers/helpers.h"
  17 #include "helpers/bitmask.h"
  18
  19 struct cmd_struct {
  20         const char *cmd;
  21         int (*main)(int, const char **);
  22         void (*usage)(void);
  23         int needs_root;
  24 };
  25
  26 #define ARRAY_SIZE(x) (sizeof(x)/sizeof(x[0]))
  27
  28 int cmd_help(int argc, const char **argv);
  29
  30 /* Global cpu_info object available for all binaries
  31  * Info only retrieved from CPU 0
  32  *
  33  * Values will be zero/unknown on non X86 archs
  34  */
  35 struct cpupower_cpu_info cpupower_cpu_info;
  36 int run_as_root;
  37 /* Affected cpus chosen by -c/--cpu param */
  38 struct bitmask *cpus_chosen;
  39
  40 #ifdef DEBUG
  41 int be_verbose;
  42 #endif
  43
  44 static void print_help(void);
  45
  46 static struct cmd_struct commands[] = {
  47         { "frequency-info",     cmd_freq_info,  freq_info_help, 0       },
  48         { "frequency-set",      cmd_freq_set,   freq_set_help,  1       },
  49         { "idle-info",          cmd_idle_info,  idle_info_help, 0       },
  50         { "set",                cmd_set,        set_help,       1       },
  51         { "info",               cmd_info,       info_help,      0       },
  52         { "monitor",            cmd_monitor,    monitor_help,   0       },
  53         { "help",               cmd_help,       print_help,     0       },
  54         /*      { "bench",      cmd_bench,      NULL,           1       }, */
  55 };
  56
  57 int cmd_help(int argc, const char **argv)
  58 {
  59         unsigned int i;
  60
  61         if (argc > 1) {
  62                 for (i = 0; i < ARRAY_SIZE(commands); i++) {
  63                         struct cmd_struct *p = commands + i;
  64                         if (strcmp(p->cmd, argv[1]))
  65                                 continue;
  66                         if (p->usage) {
  67                                 p->usage();
  68                                 return EXIT_SUCCESS;
  69                         }
  70                 }
  71         }
  72         print_help();
  73         if (argc == 1)
  74                 return EXIT_SUCCESS; /* cpupower help */
  75         return EXIT_FAILURE;
  76 }
  77
  78 static void print_help(void)
  79 {
  80         unsigned int i;
  81
  82 #ifdef DEBUG
  83         printf(_("cpupower [ -d ][ -c cpulist ] subcommand [ARGS]\n"));
  84         printf(_("  -d, --debug      May increase output (stderr) on some subcommands\n"));
  85 #else
  86         printf(_("cpupower [ -c cpulist ] subcommand [ARGS]\n"));
  87 #endif
  88         printf(_("cpupower --version\n"));
  89         printf(_("Supported subcommands are:\n"));
  90         for (i = 0; i < ARRAY_SIZE(commands); i++)
  91                 printf("\t%s\n", commands[i].cmd);
  92         printf(_("\nSome subcommands can make use of the -c cpulist option.\n"));
  93         printf(_("Look at the general cpupower manpage how to use it\n"));
  94         printf(_("and read up the subcommand's manpage whether it is supported.\n"));
  95         printf(_("\nUse cpupower help subcommand for getting help for above subcommands.\n"));
  96 }
  97
  98 static void print_version(void)
  99 {
 100         printf(PACKAGE " " VERSION "\n");
 101         printf(_("Report errors and bugs to %s, please.\n"), PACKAGE_BUGREPORT);
 102 }
 103
 104 static void handle_options(int *argc, const char ***argv)
 105 {
 106         int ret, x, new_argc = 0;
 107
 108         if (*argc < 1)
 109                 return;
 110
 111         for (x = 0;  x < *argc && ((*argv)[x])[0] == '-'; x++) {
 112                 const char *param = (*argv)[x];
 113                 if (!strcmp(param, "-h") || !strcmp(param, "--help")) {
 114                         print_help();
 115                         exit(EXIT_SUCCESS);
 116                 } else if (!strcmp(param, "-c") || !strcmp(param, "--cpu")) {
 117                         if (*argc < 2) {
 118                                 print_help();
 119                                 exit(EXIT_FAILURE);
 120                         }
 121                         if (!strcmp((*argv)[x+1], "all"))
 122                                 bitmask_setall(cpus_chosen);
 123                         else {
 124                                 ret = bitmask_parselist(
 125                                                 (*argv)[x+1], cpus_chosen);
 126                                 if (ret < 0) {
 127                                         fprintf(stderr, _("Error parsing cpu "
 128                                                           "list\n"));
 129                                         exit(EXIT_FAILURE);
 130                                 }
 131                         }
 132                         x += 1;
 133                         /* Cut out param: cpupower -c 1 info -> cpupower info */
 134                         new_argc += 2;
 135                         continue;
 136                 } else if (!strcmp(param, "-v") ||
 137                         !strcmp(param, "--version")) {
 138                         print_version();
 139                         exit(EXIT_SUCCESS);
 140 #ifdef DEBUG
 141                 } else if (!strcmp(param, "-d") || !strcmp(param, "--debug")) {
 142                         be_verbose = 1;
 143                         new_argc++;
 144                         continue;
 145 #endif
 146                 } else {
 147                         fprintf(stderr, "Unknown option: %s\n", param);
 148                         print_help();
 149                         exit(EXIT_FAILURE);
 150                 }
 151         }
 152         *argc -= new_argc;
 153         *argv += new_argc;
 154 }
 155
 156 int main(int argc, const char *argv[])
 157 {
 158         const char *cmd;
 159         unsigned int i, ret;
 160
 161         cpus_chosen = bitmask_alloc(sysconf(_SC_NPROCESSORS_CONF));
 162
 163         argc--;
 164         argv += 1;
 165
 166         handle_options(&argc, &argv);
 167
 168         cmd = argv[0];
 169
 170         if (argc < 1) {
 171                 print_help();
 172                 return EXIT_FAILURE;
 173         }
 174
 175         setlocale(LC_ALL, "");
 176         textdomain(PACKAGE);
 177
 178         /* Turn "perf cmd --help" into "perf help cmd" */
 179         if (argc > 1 && !strcmp(argv[1], "--help")) {
 180                 argv[1] = argv[0];
 181                 argv[0] = cmd = "help";
 182         }
 183
 184         get_cpu_info(0, &cpupower_cpu_info);
 185         run_as_root = !getuid();
 186
 187         for (i = 0; i < ARRAY_SIZE(commands); i++) {
 188                 struct cmd_struct *p = commands + i;
 189                 if (strcmp(p->cmd, cmd))
 190                         continue;
 191                 if (!run_as_root && p->needs_root) {
 192                         fprintf(stderr, _("Subcommand %s needs root "
 193                                           "privileges\n"), cmd);
 194                         return EXIT_FAILURE;
 195                 }
 196                 ret = p->main(argc, argv);
 197                 if (cpus_chosen)
 198                         bitmask_free(cpus_chosen);
 199                 return ret;
 200         }
 201         print_help();
 202         return EXIT_FAILURE;
 203 }