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 #include <errno.h>
  15 #include <sys/types.h>
  16 #include <sys/stat.h>
  17 #include <sys/utsname.h>
  18
  19 #include "builtin.h"
  20 #include "helpers/helpers.h"
  21 #include "helpers/bitmask.h"
  22
  23 #define ARRAY_SIZE(x) (sizeof(x)/sizeof(x[0]))
  24
  25 static int cmd_help(int argc, const char **argv);
  26
  27 /* Global cpu_info object available for all binaries
  28  * Info only retrieved from CPU 0
  29  *
  30  * Values will be zero/unknown on non X86 archs
  31  */
  32 struct cpupower_cpu_info cpupower_cpu_info;
  33 int run_as_root;
  34 /* Affected cpus chosen by -c/--cpu param */
  35 struct bitmask *cpus_chosen;
  36
  37 #ifdef DEBUG
  38 int be_verbose;
  39 #endif
  40
  41 static void print_help(void);
  42
  43 struct cmd_struct {
  44         const char *cmd;
  45         int (*main)(int, const char **);
  46         int needs_root;
  47 };
  48
  49 static struct cmd_struct commands[] = {
  50         { "frequency-info",     cmd_freq_info,  0       },
  51         { "frequency-set",      cmd_freq_set,   1       },
  52         { "idle-info",          cmd_idle_info,  0       },
  53         { "idle-set",           cmd_idle_set,   1       },
  54         { "set",                cmd_set,        1       },
  55         { "info",               cmd_info,       0       },
  56         { "monitor",            cmd_monitor,    0       },
  57         { "help",               cmd_help,       0       },
  58         /*      { "bench",      cmd_bench,      1       }, */
  59 };
  60
  61 static void print_help(void)
  62 {
  63         unsigned int i;
  64
  65 #ifdef DEBUG
  66         printf(_("Usage:\tcpupower [-d|--debug] [-c|--cpu cpulist ] <command> [<args>]\n"));
  67 #else
  68         printf(_("Usage:\tcpupower [-c|--cpu cpulist ] <command> [<args>]\n"));
  69 #endif
  70         printf(_("Supported commands are:\n"));
  71         for (i = 0; i < ARRAY_SIZE(commands); i++)
  72                 printf("\t%s\n", commands[i].cmd);
  73         printf(_("\nNot all commands can make use of the -c cpulist option.\n"));
  74         printf(_("\nUse 'cpupower help <command>' for getting help for above commands.\n"));
  75 }
  76
  77 static int print_man_page(const char *subpage)
  78 {
  79         int len;
  80         char *page;
  81
  82         len = 10; /* enough for "cpupower-" */
  83         if (subpage != NULL)
  84                 len += strlen(subpage);
  85
  86         page = malloc(len);
  87         if (!page)
  88                 return -ENOMEM;
  89
  90         sprintf(page, "cpupower");
  91         if ((subpage != NULL) && strcmp(subpage, "help")) {
  92                 strcat(page, "-");
  93                 strcat(page, subpage);
  94         }
  95
  96         execlp("man", "man", page, NULL);
  97
  98         /* should not be reached */
  99         return -EINVAL;
 100 }
 101
 102 static int cmd_help(int argc, const char **argv)
 103 {
 104         if (argc > 1) {
 105                 print_man_page(argv[1]); /* exits within execlp() */
 106                 return EXIT_FAILURE;
 107         }
 108
 109         print_help();
 110         return EXIT_SUCCESS;
 111 }
 112
 113 static void print_version(void)
 114 {
 115         printf(PACKAGE " " VERSION "\n");
 116         printf(_("Report errors and bugs to %s, please.\n"), PACKAGE_BUGREPORT);
 117 }
 118
 119 static void handle_options(int *argc, const char ***argv)
 120 {
 121         int ret, x, new_argc = 0;
 122
 123         if (*argc < 1)
 124                 return;
 125
 126         for (x = 0;  x < *argc && ((*argv)[x])[0] == '-'; x++) {
 127                 const char *param = (*argv)[x];
 128                 if (!strcmp(param, "-h") || !strcmp(param, "--help")) {
 129                         print_help();
 130                         exit(EXIT_SUCCESS);
 131                 } else if (!strcmp(param, "-c") || !strcmp(param, "--cpu")) {
 132                         if (*argc < 2) {
 133                                 print_help();
 134                                 exit(EXIT_FAILURE);
 135                         }
 136                         if (!strcmp((*argv)[x+1], "all"))
 137                                 bitmask_setall(cpus_chosen);
 138                         else {
 139                                 ret = bitmask_parselist(
 140                                                 (*argv)[x+1], cpus_chosen);
 141                                 if (ret < 0) {
 142                                         fprintf(stderr, _("Error parsing cpu "
 143                                                           "list\n"));
 144                                         exit(EXIT_FAILURE);
 145                                 }
 146                         }
 147                         x += 1;
 148                         /* Cut out param: cpupower -c 1 info -> cpupower info */
 149                         new_argc += 2;
 150                         continue;
 151                 } else if (!strcmp(param, "-v") ||
 152                         !strcmp(param, "--version")) {
 153                         print_version();
 154                         exit(EXIT_SUCCESS);
 155 #ifdef DEBUG
 156                 } else if (!strcmp(param, "-d") || !strcmp(param, "--debug")) {
 157                         be_verbose = 1;
 158                         new_argc++;
 159                         continue;
 160 #endif
 161                 } else {
 162                         fprintf(stderr, "Unknown option: %s\n", param);
 163                         print_help();
 164                         exit(EXIT_FAILURE);
 165                 }
 166         }
 167         *argc -= new_argc;
 168         *argv += new_argc;
 169 }
 170
 171 int main(int argc, const char *argv[])
 172 {
 173         const char *cmd;
 174         unsigned int i, ret;
 175         struct stat statbuf;
 176         struct utsname uts;
 177
 178         cpus_chosen = bitmask_alloc(sysconf(_SC_NPROCESSORS_CONF));
 179
 180         argc--;
 181         argv += 1;
 182
 183         handle_options(&argc, &argv);
 184
 185         cmd = argv[0];
 186
 187         if (argc < 1) {
 188                 print_help();
 189                 return EXIT_FAILURE;
 190         }
 191
 192         setlocale(LC_ALL, "");
 193         textdomain(PACKAGE);
 194
 195         /* Turn "perf cmd --help" into "perf help cmd" */
 196         if (argc > 1 && !strcmp(argv[1], "--help")) {
 197                 argv[1] = argv[0];
 198                 argv[0] = cmd = "help";
 199         }
 200
 201         get_cpu_info(0, &cpupower_cpu_info);
 202         run_as_root = !getuid();
 203         if (run_as_root) {
 204                 ret = uname(&uts);
 205                 if (!ret && !strcmp(uts.machine, "x86_64") &&
 206                     stat("/dev/cpu/0/msr", &statbuf) != 0) {
 207                         if (system("modprobe msr") == -1)
 208         fprintf(stderr, _("MSR access not available.\n"));
 209                 }
 210         }
 211
 212
 213         for (i = 0; i < ARRAY_SIZE(commands); i++) {
 214                 struct cmd_struct *p = commands + i;
 215                 if (strcmp(p->cmd, cmd))
 216                         continue;
 217                 if (!run_as_root && p->needs_root) {
 218                         fprintf(stderr, _("Subcommand %s needs root "
 219                                           "privileges\n"), cmd);
 220                         return EXIT_FAILURE;
 221                 }
 222                 ret = p->main(argc, argv);
 223                 if (cpus_chosen)
 224                         bitmask_free(cpus_chosen);
 225                 return ret;
 226         }
 227         print_help();
 228         return EXIT_FAILURE;
 229 }