tools/power/cpupower/utils/cpufreq-set.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  *  (C) 2004-2009  Dominik Brodowski <linux@dominikbrodowski.de>
   4  */
   5
   6
   7 #include <unistd.h>
   8 #include <stdio.h>
   9 #include <errno.h>
  10 #include <stdlib.h>
  11 #include <limits.h>
  12 #include <string.h>
  13 #include <ctype.h>
  14
  15 #include <getopt.h>
  16
  17 #include "cpufreq.h"
  18 #include "cpuidle.h"
  19 #include "helpers/helpers.h"
  20
  21 #define NORM_FREQ_LEN 32
  22
  23 static struct option set_opts[] = {
  24         {"min",         required_argument,      NULL, 'd'},
  25         {"max",         required_argument,      NULL, 'u'},
  26         {"governor",    required_argument,      NULL, 'g'},
  27         {"freq",        required_argument,      NULL, 'f'},
  28         {"related",     no_argument,            NULL, 'r'},
  29         { },
  30 };
  31
  32 static void print_error(void)
  33 {
  34         printf(_("Error setting new values. Common errors:\n"
  35                         "- Do you have proper administration rights? (super-user?)\n"
  36                         "- Is the governor you requested available and modprobed?\n"
  37                         "- Trying to set an invalid policy?\n"
  38                         "- Trying to set a specific frequency, but userspace governor is not available,\n"
  39                         "   for example because of hardware which cannot be set to a specific frequency\n"
  40                         "   or because the userspace governor isn't loaded?\n"));
  41 };
  42
  43 struct freq_units {
  44         char            *str_unit;
  45         int             power_of_ten;
  46 };
  47
  48 const struct freq_units def_units[] = {
  49         {"hz", -3},
  50         {"khz", 0}, /* default */
  51         {"mhz", 3},
  52         {"ghz", 6},
  53         {"thz", 9},
  54         {NULL, 0}
  55 };
  56
  57 static void print_unknown_arg(void)
  58 {
  59         printf(_("invalid or unknown argument\n"));
  60 }
  61
  62 static unsigned long string_to_frequency(const char *str)
  63 {
  64         char normalized[NORM_FREQ_LEN];
  65         const struct freq_units *unit;
  66         const char *scan;
  67         char *end;
  68         unsigned long freq;
  69         int power = 0, match_count = 0, i, cp, pad;
  70
  71         while (*str == '0')
  72                 str++;
  73
  74         for (scan = str; isdigit(*scan) || *scan == '.'; scan++) {
  75                 if (*scan == '.' && match_count == 0)
  76                         match_count = 1;
  77                 else if (*scan == '.' && match_count == 1)
  78                         return 0;
  79         }
  80
  81         if (*scan) {
  82                 match_count = 0;
  83                 for (unit = def_units; unit->str_unit; unit++) {
  84                         for (i = 0;
  85                              scan[i] && tolower(scan[i]) == unit->str_unit[i];
  86                              ++i)
  87                                 continue;
  88                         if (scan[i])
  89                                 continue;
  90                         match_count++;
  91                         power = unit->power_of_ten;
  92                 }
  93                 if (match_count != 1)
  94                         return 0;
  95         }
  96
  97         /* count the number of digits to be copied */
  98         for (cp = 0; isdigit(str[cp]); cp++)
  99                 continue;
 100
 101         if (str[cp] == '.') {
 102                 while (power > -1 && isdigit(str[cp+1])) {
 103                         cp++;
 104                         power--;
 105                 }
 106         }
 107         if (power >= -1) {              /* not enough => pad */
 108                 pad = power + 1;
 109         } else {                        /* too much => strip */
 110                 pad = 0;
 111                 cp += power + 1;
 112         }
 113         /* check bounds */
 114         if (cp <= 0 || cp + pad > NORM_FREQ_LEN - 1)
 115                 return 0;
 116
 117         /* copy digits */
 118         for (i = 0; i < cp; i++, str++) {
 119                 if (*str == '.')
 120                         str++;
 121                 normalized[i] = *str;
 122         }
 123         /* and pad */
 124         for (; i < cp + pad; i++)
 125                 normalized[i] = '0';
 126
 127         /* round up, down ? */
 128         match_count = (normalized[i-1] >= '5');
 129         /* and drop the decimal part */
 130         normalized[i-1] = 0; /* cp > 0 && pad >= 0 ==> i > 0 */
 131
 132         /* final conversion (and applying rounding) */
 133         errno = 0;
 134         freq = strtoul(normalized, &end, 10);
 135         if (errno)
 136                 return 0;
 137         else {
 138                 if (match_count && freq != ULONG_MAX)
 139                         freq++;
 140                 return freq;
 141         }
 142 }
 143
 144 static int do_new_policy(unsigned int cpu, struct cpufreq_policy *new_pol)
 145 {
 146         struct cpufreq_policy *cur_pol = cpufreq_get_policy(cpu);
 147         int ret;
 148
 149         if (!cur_pol) {
 150                 printf(_("wrong, unknown or unhandled CPU?\n"));
 151                 return -EINVAL;
 152         }
 153
 154         if (!new_pol->min)
 155                 new_pol->min = cur_pol->min;
 156
 157         if (!new_pol->max)
 158                 new_pol->max = cur_pol->max;
 159
 160         if (!new_pol->governor)
 161                 new_pol->governor = cur_pol->governor;
 162
 163         ret = cpufreq_set_policy(cpu, new_pol);
 164
 165         cpufreq_put_policy(cur_pol);
 166
 167         return ret;
 168 }
 169
 170
 171 static int do_one_cpu(unsigned int cpu, struct cpufreq_policy *new_pol,
 172                 unsigned long freq, unsigned int pc)
 173 {
 174         switch (pc) {
 175         case 0:
 176                 return cpufreq_set_frequency(cpu, freq);
 177
 178         case 1:
 179                 /* if only one value of a policy is to be changed, we can
 180                  * use a "fast path".
 181                  */
 182                 if (new_pol->min)
 183                         return cpufreq_modify_policy_min(cpu, new_pol->min);
 184                 else if (new_pol->max)
 185                         return cpufreq_modify_policy_max(cpu, new_pol->max);
 186                 else if (new_pol->governor)
 187                         return cpufreq_modify_policy_governor(cpu,
 188                                                         new_pol->governor);
 189
 190         default:
 191                 /* slow path */
 192                 return do_new_policy(cpu, new_pol);
 193         }
 194 }
 195
 196 int cmd_freq_set(int argc, char **argv)
 197 {
 198         extern char *optarg;
 199         extern int optind, opterr, optopt;
 200         int ret = 0, cont = 1;
 201         int double_parm = 0, related = 0, policychange = 0;
 202         unsigned long freq = 0;
 203         char gov[20];
 204         unsigned int cpu;
 205
 206         struct cpufreq_policy new_pol = {
 207                 .min = 0,
 208                 .max = 0,
 209                 .governor = NULL,
 210         };
 211
 212         /* parameter parsing */
 213         do {
 214                 ret = getopt_long(argc, argv, "d:u:g:f:r", set_opts, NULL);
 215                 switch (ret) {
 216                 case '?':
 217                         print_unknown_arg();
 218                         return -EINVAL;
 219                 case -1:
 220                         cont = 0;
 221                         break;
 222                 case 'r':
 223                         if (related)
 224                                 double_parm++;
 225                         related++;
 226                         break;
 227                 case 'd':
 228                         if (new_pol.min)
 229                                 double_parm++;
 230                         policychange++;
 231                         new_pol.min = string_to_frequency(optarg);
 232                         if (new_pol.min == 0) {
 233                                 print_unknown_arg();
 234                                 return -EINVAL;
 235                         }
 236                         break;
 237                 case 'u':
 238                         if (new_pol.max)
 239                                 double_parm++;
 240                         policychange++;
 241                         new_pol.max = string_to_frequency(optarg);
 242                         if (new_pol.max == 0) {
 243                                 print_unknown_arg();
 244                                 return -EINVAL;
 245                         }
 246                         break;
 247                 case 'f':
 248                         if (freq)
 249                                 double_parm++;
 250                         freq = string_to_frequency(optarg);
 251                         if (freq == 0) {
 252                                 print_unknown_arg();
 253                                 return -EINVAL;
 254                         }
 255                         break;
 256                 case 'g':
 257                         if (new_pol.governor)
 258                                 double_parm++;
 259                         policychange++;
 260                         if ((strlen(optarg) < 3) || (strlen(optarg) > 18)) {
 261                                 print_unknown_arg();
 262                                 return -EINVAL;
 263                         }
 264                         if ((sscanf(optarg, "%19s", gov)) != 1) {
 265                                 print_unknown_arg();
 266                                 return -EINVAL;
 267                         }
 268                         new_pol.governor = gov;
 269                         break;
 270                 }
 271         } while (cont);
 272
 273         /* parameter checking */
 274         if (double_parm) {
 275                 printf("the same parameter was passed more than once\n");
 276                 return -EINVAL;
 277         }
 278
 279         if (freq && policychange) {
 280                 printf(_("the -f/--freq parameter cannot be combined with -d/--min, -u/--max or\n"
 281                                 "-g/--governor parameters\n"));
 282                 return -EINVAL;
 283         }
 284
 285         if (!freq && !policychange) {
 286                 printf(_("At least one parameter out of -f/--freq, -d/--min, -u/--max, and\n"
 287                                 "-g/--governor must be passed\n"));
 288                 return -EINVAL;
 289         }
 290
 291         /* Default is: set all CPUs */
 292         if (bitmask_isallclear(cpus_chosen))
 293                 bitmask_setall(cpus_chosen);
 294
 295         /* Also set frequency settings for related CPUs if -r is passed */
 296         if (related) {
 297                 for (cpu = bitmask_first(cpus_chosen);
 298                      cpu <= bitmask_last(cpus_chosen); cpu++) {
 299                         struct cpufreq_affected_cpus *cpus;
 300
 301                         if (!bitmask_isbitset(cpus_chosen, cpu) ||
 302                             cpupower_is_cpu_online(cpu) != 1)
 303                                 continue;
 304
 305                         cpus = cpufreq_get_related_cpus(cpu);
 306                         if (!cpus)
 307                                 break;
 308                         while (cpus->next) {
 309                                 bitmask_setbit(cpus_chosen, cpus->cpu);
 310                                 cpus = cpus->next;
 311                         }
 312                         /* Set the last cpu in related cpus list */
 313                         bitmask_setbit(cpus_chosen, cpus->cpu);
 314                         cpufreq_put_related_cpus(cpus);
 315                 }
 316         }
 317
 318         get_cpustate();
 319
 320         /* loop over CPUs */
 321         for (cpu = bitmask_first(cpus_chosen);
 322              cpu <= bitmask_last(cpus_chosen); cpu++) {
 323
 324                 if (!bitmask_isbitset(cpus_chosen, cpu) ||
 325                     cpupower_is_cpu_online(cpu) != 1)
 326                         continue;
 327
 328                 printf(_("Setting cpu: %d\n"), cpu);
 329                 ret = do_one_cpu(cpu, &new_pol, freq, policychange);
 330                 if (ret) {
 331                         print_error();
 332                         return ret;
 333                 }
 334         }
 335
 336         print_offline_cpus();
 337
 338         return 0;
 339 }