1 #include <linux/sysdev.h> 2 #include <linux/cpu.h> 3 #include <linux/smp.h> 4 #include <linux/percpu.h> 5 #include <linux/init.h> 6 #include <linux/sched.h> 7 #include <linux/module.h> 8 #include <linux/nodemask.h> 9 #include <linux/cpumask.h> 10 #include <linux/notifier.h> 11 12 #include <asm/current.h> 13 #include <asm/processor.h> 14 #include <asm/cputable.h> 15 #include <asm/firmware.h> 16 #include <asm/hvcall.h> 17 #include <asm/prom.h> 18 #include <asm/paca.h> 19 #include <asm/lppaca.h> 20 #include <asm/machdep.h> 21 #include <asm/smp.h> 22 23 static DEFINE_PER_CPU(struct cpu, cpu_devices); 24 25 /* SMT stuff */ 26 27 #ifdef CONFIG_PPC_MULTIPLATFORM 28 /* Time in microseconds we delay before sleeping in the idle loop */ 29 DEFINE_PER_CPU(unsigned long, smt_snooze_delay) = { 100 }; 30 31 static ssize_t store_smt_snooze_delay(struct sys_device *dev, 32 struct sysdev_attribute *attr, 33 const char *buf, 34 size_t count) 35 { 36 struct cpu *cpu = container_of(dev, struct cpu, sysdev); 37 ssize_t ret; 38 unsigned long snooze; 39 40 ret = sscanf(buf, "%lu", &snooze); 41 if (ret != 1) 42 return -EINVAL; 43 44 per_cpu(smt_snooze_delay, cpu->sysdev.id) = snooze; 45 46 return count; 47 } 48 49 static ssize_t show_smt_snooze_delay(struct sys_device *dev, 50 struct sysdev_attribute *attr, 51 char *buf) 52 { 53 struct cpu *cpu = container_of(dev, struct cpu, sysdev); 54 55 return sprintf(buf, "%lu\n", per_cpu(smt_snooze_delay, cpu->sysdev.id)); 56 } 57 58 static SYSDEV_ATTR(smt_snooze_delay, 0644, show_smt_snooze_delay, 59 store_smt_snooze_delay); 60 61 /* Only parse OF options if the matching cmdline option was not specified */ 62 static int smt_snooze_cmdline; 63 64 static int __init smt_setup(void) 65 { 66 struct device_node *options; 67 const unsigned int *val; 68 unsigned int cpu; 69 70 if (!cpu_has_feature(CPU_FTR_SMT)) 71 return -ENODEV; 72 73 options = of_find_node_by_path("/options"); 74 if (!options) 75 return -ENODEV; 76 77 val = of_get_property(options, "ibm,smt-snooze-delay", NULL); 78 if (!smt_snooze_cmdline && val) { 79 for_each_possible_cpu(cpu) 80 per_cpu(smt_snooze_delay, cpu) = *val; 81 } 82 83 of_node_put(options); 84 return 0; 85 } 86 __initcall(smt_setup); 87 88 static int __init setup_smt_snooze_delay(char *str) 89 { 90 unsigned int cpu; 91 int snooze; 92 93 if (!cpu_has_feature(CPU_FTR_SMT)) 94 return 1; 95 96 smt_snooze_cmdline = 1; 97 98 if (get_option(&str, &snooze)) { 99 for_each_possible_cpu(cpu) 100 per_cpu(smt_snooze_delay, cpu) = snooze; 101 } 102 103 return 1; 104 } 105 __setup("smt-snooze-delay=", setup_smt_snooze_delay); 106 107 #endif /* CONFIG_PPC_MULTIPLATFORM */ 108 109 /* 110 * Enabling PMCs will slow partition context switch times so we only do 111 * it the first time we write to the PMCs. 112 */ 113 114 static DEFINE_PER_CPU(char, pmcs_enabled); 115 116 void ppc64_enable_pmcs(void) 117 { 118 /* Only need to enable them once */ 119 if (__get_cpu_var(pmcs_enabled)) 120 return; 121 122 __get_cpu_var(pmcs_enabled) = 1; 123 124 if (ppc_md.enable_pmcs) 125 ppc_md.enable_pmcs(); 126 } 127 EXPORT_SYMBOL(ppc64_enable_pmcs); 128 129 /* XXX convert to rusty's on_one_cpu */ 130 static unsigned long run_on_cpu(unsigned long cpu, 131 unsigned long (*func)(unsigned long), 132 unsigned long arg) 133 { 134 cpumask_t old_affinity = current->cpus_allowed; 135 unsigned long ret; 136 137 /* should return -EINVAL to userspace */ 138 if (set_cpus_allowed(current, cpumask_of_cpu(cpu))) 139 return 0; 140 141 ret = func(arg); 142 143 set_cpus_allowed(current, old_affinity); 144 145 return ret; 146 } 147 148 #define SYSFS_PMCSETUP(NAME, ADDRESS) \ 149 static unsigned long read_##NAME(unsigned long junk) \ 150 { \ 151 return mfspr(ADDRESS); \ 152 } \ 153 static unsigned long write_##NAME(unsigned long val) \ 154 { \ 155 ppc64_enable_pmcs(); \ 156 mtspr(ADDRESS, val); \ 157 return 0; \ 158 } \ 159 static ssize_t show_##NAME(struct sys_device *dev, \ 160 struct sysdev_attribute *attr, \ 161 char *buf) \ 162 { \ 163 struct cpu *cpu = container_of(dev, struct cpu, sysdev); \ 164 unsigned long val = run_on_cpu(cpu->sysdev.id, read_##NAME, 0); \ 165 return sprintf(buf, "%lx\n", val); \ 166 } \ 167 static ssize_t __used \ 168 store_##NAME(struct sys_device *dev, struct sysdev_attribute *attr, \ 169 const char *buf, size_t count) \ 170 { \ 171 struct cpu *cpu = container_of(dev, struct cpu, sysdev); \ 172 unsigned long val; \ 173 int ret = sscanf(buf, "%lx", &val); \ 174 if (ret != 1) \ 175 return -EINVAL; \ 176 run_on_cpu(cpu->sysdev.id, write_##NAME, val); \ 177 return count; \ 178 } 179 180 181 /* Let's define all possible registers, we'll only hook up the ones 182 * that are implemented on the current processor 183 */ 184 185 SYSFS_PMCSETUP(mmcr0, SPRN_MMCR0); 186 SYSFS_PMCSETUP(mmcr1, SPRN_MMCR1); 187 SYSFS_PMCSETUP(mmcra, SPRN_MMCRA); 188 SYSFS_PMCSETUP(pmc1, SPRN_PMC1); 189 SYSFS_PMCSETUP(pmc2, SPRN_PMC2); 190 SYSFS_PMCSETUP(pmc3, SPRN_PMC3); 191 SYSFS_PMCSETUP(pmc4, SPRN_PMC4); 192 SYSFS_PMCSETUP(pmc5, SPRN_PMC5); 193 SYSFS_PMCSETUP(pmc6, SPRN_PMC6); 194 SYSFS_PMCSETUP(pmc7, SPRN_PMC7); 195 SYSFS_PMCSETUP(pmc8, SPRN_PMC8); 196 SYSFS_PMCSETUP(purr, SPRN_PURR); 197 SYSFS_PMCSETUP(spurr, SPRN_SPURR); 198 SYSFS_PMCSETUP(dscr, SPRN_DSCR); 199 200 SYSFS_PMCSETUP(pa6t_pmc0, SPRN_PA6T_PMC0); 201 SYSFS_PMCSETUP(pa6t_pmc1, SPRN_PA6T_PMC1); 202 SYSFS_PMCSETUP(pa6t_pmc2, SPRN_PA6T_PMC2); 203 SYSFS_PMCSETUP(pa6t_pmc3, SPRN_PA6T_PMC3); 204 SYSFS_PMCSETUP(pa6t_pmc4, SPRN_PA6T_PMC4); 205 SYSFS_PMCSETUP(pa6t_pmc5, SPRN_PA6T_PMC5); 206 207 #ifdef CONFIG_DEBUG_KERNEL 208 SYSFS_PMCSETUP(hid0, SPRN_HID0); 209 SYSFS_PMCSETUP(hid1, SPRN_HID1); 210 SYSFS_PMCSETUP(hid4, SPRN_HID4); 211 SYSFS_PMCSETUP(hid5, SPRN_HID5); 212 SYSFS_PMCSETUP(ima0, SPRN_PA6T_IMA0); 213 SYSFS_PMCSETUP(ima1, SPRN_PA6T_IMA1); 214 SYSFS_PMCSETUP(ima2, SPRN_PA6T_IMA2); 215 SYSFS_PMCSETUP(ima3, SPRN_PA6T_IMA3); 216 SYSFS_PMCSETUP(ima4, SPRN_PA6T_IMA4); 217 SYSFS_PMCSETUP(ima5, SPRN_PA6T_IMA5); 218 SYSFS_PMCSETUP(ima6, SPRN_PA6T_IMA6); 219 SYSFS_PMCSETUP(ima7, SPRN_PA6T_IMA7); 220 SYSFS_PMCSETUP(ima8, SPRN_PA6T_IMA8); 221 SYSFS_PMCSETUP(ima9, SPRN_PA6T_IMA9); 222 SYSFS_PMCSETUP(imaat, SPRN_PA6T_IMAAT); 223 SYSFS_PMCSETUP(btcr, SPRN_PA6T_BTCR); 224 SYSFS_PMCSETUP(pccr, SPRN_PA6T_PCCR); 225 SYSFS_PMCSETUP(rpccr, SPRN_PA6T_RPCCR); 226 SYSFS_PMCSETUP(der, SPRN_PA6T_DER); 227 SYSFS_PMCSETUP(mer, SPRN_PA6T_MER); 228 SYSFS_PMCSETUP(ber, SPRN_PA6T_BER); 229 SYSFS_PMCSETUP(ier, SPRN_PA6T_IER); 230 SYSFS_PMCSETUP(sier, SPRN_PA6T_SIER); 231 SYSFS_PMCSETUP(siar, SPRN_PA6T_SIAR); 232 SYSFS_PMCSETUP(tsr0, SPRN_PA6T_TSR0); 233 SYSFS_PMCSETUP(tsr1, SPRN_PA6T_TSR1); 234 SYSFS_PMCSETUP(tsr2, SPRN_PA6T_TSR2); 235 SYSFS_PMCSETUP(tsr3, SPRN_PA6T_TSR3); 236 #endif /* CONFIG_DEBUG_KERNEL */ 237 238 static SYSDEV_ATTR(mmcra, 0600, show_mmcra, store_mmcra); 239 static SYSDEV_ATTR(spurr, 0600, show_spurr, NULL); 240 static SYSDEV_ATTR(dscr, 0600, show_dscr, store_dscr); 241 static SYSDEV_ATTR(purr, 0600, show_purr, store_purr); 242 243 static struct sysdev_attribute ibm_common_attrs[] = { 244 _SYSDEV_ATTR(mmcr0, 0600, show_mmcr0, store_mmcr0), 245 _SYSDEV_ATTR(mmcr1, 0600, show_mmcr1, store_mmcr1), 246 }; 247 248 static struct sysdev_attribute ibm_pmc_attrs[] = { 249 _SYSDEV_ATTR(pmc1, 0600, show_pmc1, store_pmc1), 250 _SYSDEV_ATTR(pmc2, 0600, show_pmc2, store_pmc2), 251 _SYSDEV_ATTR(pmc3, 0600, show_pmc3, store_pmc3), 252 _SYSDEV_ATTR(pmc4, 0600, show_pmc4, store_pmc4), 253 _SYSDEV_ATTR(pmc5, 0600, show_pmc5, store_pmc5), 254 _SYSDEV_ATTR(pmc6, 0600, show_pmc6, store_pmc6), 255 _SYSDEV_ATTR(pmc7, 0600, show_pmc7, store_pmc7), 256 _SYSDEV_ATTR(pmc8, 0600, show_pmc8, store_pmc8), 257 }; 258 259 static struct sysdev_attribute pa6t_attrs[] = { 260 _SYSDEV_ATTR(mmcr0, 0600, show_mmcr0, store_mmcr0), 261 _SYSDEV_ATTR(mmcr1, 0600, show_mmcr1, store_mmcr1), 262 _SYSDEV_ATTR(pmc0, 0600, show_pa6t_pmc0, store_pa6t_pmc0), 263 _SYSDEV_ATTR(pmc1, 0600, show_pa6t_pmc1, store_pa6t_pmc1), 264 _SYSDEV_ATTR(pmc2, 0600, show_pa6t_pmc2, store_pa6t_pmc2), 265 _SYSDEV_ATTR(pmc3, 0600, show_pa6t_pmc3, store_pa6t_pmc3), 266 _SYSDEV_ATTR(pmc4, 0600, show_pa6t_pmc4, store_pa6t_pmc4), 267 _SYSDEV_ATTR(pmc5, 0600, show_pa6t_pmc5, store_pa6t_pmc5), 268 #ifdef CONFIG_DEBUG_KERNEL 269 _SYSDEV_ATTR(hid0, 0600, show_hid0, store_hid0), 270 _SYSDEV_ATTR(hid1, 0600, show_hid1, store_hid1), 271 _SYSDEV_ATTR(hid4, 0600, show_hid4, store_hid4), 272 _SYSDEV_ATTR(hid5, 0600, show_hid5, store_hid5), 273 _SYSDEV_ATTR(ima0, 0600, show_ima0, store_ima0), 274 _SYSDEV_ATTR(ima1, 0600, show_ima1, store_ima1), 275 _SYSDEV_ATTR(ima2, 0600, show_ima2, store_ima2), 276 _SYSDEV_ATTR(ima3, 0600, show_ima3, store_ima3), 277 _SYSDEV_ATTR(ima4, 0600, show_ima4, store_ima4), 278 _SYSDEV_ATTR(ima5, 0600, show_ima5, store_ima5), 279 _SYSDEV_ATTR(ima6, 0600, show_ima6, store_ima6), 280 _SYSDEV_ATTR(ima7, 0600, show_ima7, store_ima7), 281 _SYSDEV_ATTR(ima8, 0600, show_ima8, store_ima8), 282 _SYSDEV_ATTR(ima9, 0600, show_ima9, store_ima9), 283 _SYSDEV_ATTR(imaat, 0600, show_imaat, store_imaat), 284 _SYSDEV_ATTR(btcr, 0600, show_btcr, store_btcr), 285 _SYSDEV_ATTR(pccr, 0600, show_pccr, store_pccr), 286 _SYSDEV_ATTR(rpccr, 0600, show_rpccr, store_rpccr), 287 _SYSDEV_ATTR(der, 0600, show_der, store_der), 288 _SYSDEV_ATTR(mer, 0600, show_mer, store_mer), 289 _SYSDEV_ATTR(ber, 0600, show_ber, store_ber), 290 _SYSDEV_ATTR(ier, 0600, show_ier, store_ier), 291 _SYSDEV_ATTR(sier, 0600, show_sier, store_sier), 292 _SYSDEV_ATTR(siar, 0600, show_siar, store_siar), 293 _SYSDEV_ATTR(tsr0, 0600, show_tsr0, store_tsr0), 294 _SYSDEV_ATTR(tsr1, 0600, show_tsr1, store_tsr1), 295 _SYSDEV_ATTR(tsr2, 0600, show_tsr2, store_tsr2), 296 _SYSDEV_ATTR(tsr3, 0600, show_tsr3, store_tsr3), 297 #endif /* CONFIG_DEBUG_KERNEL */ 298 }; 299 300 301 static void register_cpu_online(unsigned int cpu) 302 { 303 struct cpu *c = &per_cpu(cpu_devices, cpu); 304 struct sys_device *s = &c->sysdev; 305 struct sysdev_attribute *attrs, *pmc_attrs; 306 int i, nattrs; 307 308 if (!firmware_has_feature(FW_FEATURE_ISERIES) && 309 cpu_has_feature(CPU_FTR_SMT)) 310 sysdev_create_file(s, &attr_smt_snooze_delay); 311 312 /* PMC stuff */ 313 switch (cur_cpu_spec->pmc_type) { 314 case PPC_PMC_IBM: 315 attrs = ibm_common_attrs; 316 nattrs = sizeof(ibm_common_attrs) / sizeof(struct sysdev_attribute); 317 pmc_attrs = ibm_pmc_attrs; 318 break; 319 case PPC_PMC_PA6T: 320 /* PA Semi starts counting at PMC0 */ 321 attrs = pa6t_attrs; 322 nattrs = sizeof(pa6t_attrs) / sizeof(struct sysdev_attribute); 323 pmc_attrs = NULL; 324 break; 325 default: 326 attrs = NULL; 327 nattrs = 0; 328 pmc_attrs = NULL; 329 } 330 331 for (i = 0; i < nattrs; i++) 332 sysdev_create_file(s, &attrs[i]); 333 334 if (pmc_attrs) 335 for (i = 0; i < cur_cpu_spec->num_pmcs; i++) 336 sysdev_create_file(s, &pmc_attrs[i]); 337 338 if (cpu_has_feature(CPU_FTR_MMCRA)) 339 sysdev_create_file(s, &attr_mmcra); 340 341 if (cpu_has_feature(CPU_FTR_PURR)) 342 sysdev_create_file(s, &attr_purr); 343 344 if (cpu_has_feature(CPU_FTR_SPURR)) 345 sysdev_create_file(s, &attr_spurr); 346 347 if (cpu_has_feature(CPU_FTR_DSCR)) 348 sysdev_create_file(s, &attr_dscr); 349 } 350 351 #ifdef CONFIG_HOTPLUG_CPU 352 static void unregister_cpu_online(unsigned int cpu) 353 { 354 struct cpu *c = &per_cpu(cpu_devices, cpu); 355 struct sys_device *s = &c->sysdev; 356 struct sysdev_attribute *attrs, *pmc_attrs; 357 int i, nattrs; 358 359 BUG_ON(!c->hotpluggable); 360 361 if (!firmware_has_feature(FW_FEATURE_ISERIES) && 362 cpu_has_feature(CPU_FTR_SMT)) 363 sysdev_remove_file(s, &attr_smt_snooze_delay); 364 365 /* PMC stuff */ 366 switch (cur_cpu_spec->pmc_type) { 367 case PPC_PMC_IBM: 368 attrs = ibm_common_attrs; 369 nattrs = sizeof(ibm_common_attrs) / sizeof(struct sysdev_attribute); 370 pmc_attrs = ibm_pmc_attrs; 371 break; 372 case PPC_PMC_PA6T: 373 /* PA Semi starts counting at PMC0 */ 374 attrs = pa6t_attrs; 375 nattrs = sizeof(pa6t_attrs) / sizeof(struct sysdev_attribute); 376 pmc_attrs = NULL; 377 break; 378 default: 379 attrs = NULL; 380 nattrs = 0; 381 pmc_attrs = NULL; 382 } 383 384 for (i = 0; i < nattrs; i++) 385 sysdev_remove_file(s, &attrs[i]); 386 387 if (pmc_attrs) 388 for (i = 0; i < cur_cpu_spec->num_pmcs; i++) 389 sysdev_remove_file(s, &pmc_attrs[i]); 390 391 if (cpu_has_feature(CPU_FTR_MMCRA)) 392 sysdev_remove_file(s, &attr_mmcra); 393 394 if (cpu_has_feature(CPU_FTR_PURR)) 395 sysdev_remove_file(s, &attr_purr); 396 397 if (cpu_has_feature(CPU_FTR_SPURR)) 398 sysdev_remove_file(s, &attr_spurr); 399 400 if (cpu_has_feature(CPU_FTR_DSCR)) 401 sysdev_remove_file(s, &attr_dscr); 402 } 403 #endif /* CONFIG_HOTPLUG_CPU */ 404 405 static int __cpuinit sysfs_cpu_notify(struct notifier_block *self, 406 unsigned long action, void *hcpu) 407 { 408 unsigned int cpu = (unsigned int)(long)hcpu; 409 410 switch (action) { 411 case CPU_ONLINE: 412 case CPU_ONLINE_FROZEN: 413 register_cpu_online(cpu); 414 break; 415 #ifdef CONFIG_HOTPLUG_CPU 416 case CPU_DEAD: 417 case CPU_DEAD_FROZEN: 418 unregister_cpu_online(cpu); 419 break; 420 #endif 421 } 422 return NOTIFY_OK; 423 } 424 425 static struct notifier_block __cpuinitdata sysfs_cpu_nb = { 426 .notifier_call = sysfs_cpu_notify, 427 }; 428 429 static DEFINE_MUTEX(cpu_mutex); 430 431 int cpu_add_sysdev_attr(struct sysdev_attribute *attr) 432 { 433 int cpu; 434 435 mutex_lock(&cpu_mutex); 436 437 for_each_possible_cpu(cpu) { 438 sysdev_create_file(get_cpu_sysdev(cpu), attr); 439 } 440 441 mutex_unlock(&cpu_mutex); 442 return 0; 443 } 444 EXPORT_SYMBOL_GPL(cpu_add_sysdev_attr); 445 446 int cpu_add_sysdev_attr_group(struct attribute_group *attrs) 447 { 448 int cpu; 449 struct sys_device *sysdev; 450 int ret; 451 452 mutex_lock(&cpu_mutex); 453 454 for_each_possible_cpu(cpu) { 455 sysdev = get_cpu_sysdev(cpu); 456 ret = sysfs_create_group(&sysdev->kobj, attrs); 457 WARN_ON(ret != 0); 458 } 459 460 mutex_unlock(&cpu_mutex); 461 return 0; 462 } 463 EXPORT_SYMBOL_GPL(cpu_add_sysdev_attr_group); 464 465 466 void cpu_remove_sysdev_attr(struct sysdev_attribute *attr) 467 { 468 int cpu; 469 470 mutex_lock(&cpu_mutex); 471 472 for_each_possible_cpu(cpu) { 473 sysdev_remove_file(get_cpu_sysdev(cpu), attr); 474 } 475 476 mutex_unlock(&cpu_mutex); 477 } 478 EXPORT_SYMBOL_GPL(cpu_remove_sysdev_attr); 479 480 void cpu_remove_sysdev_attr_group(struct attribute_group *attrs) 481 { 482 int cpu; 483 struct sys_device *sysdev; 484 485 mutex_lock(&cpu_mutex); 486 487 for_each_possible_cpu(cpu) { 488 sysdev = get_cpu_sysdev(cpu); 489 sysfs_remove_group(&sysdev->kobj, attrs); 490 } 491 492 mutex_unlock(&cpu_mutex); 493 } 494 EXPORT_SYMBOL_GPL(cpu_remove_sysdev_attr_group); 495 496 497 /* NUMA stuff */ 498 499 #ifdef CONFIG_NUMA 500 static void register_nodes(void) 501 { 502 int i; 503 504 for (i = 0; i < MAX_NUMNODES; i++) 505 register_one_node(i); 506 } 507 508 int sysfs_add_device_to_node(struct sys_device *dev, int nid) 509 { 510 struct node *node = &node_devices[nid]; 511 return sysfs_create_link(&node->sysdev.kobj, &dev->kobj, 512 kobject_name(&dev->kobj)); 513 } 514 EXPORT_SYMBOL_GPL(sysfs_add_device_to_node); 515 516 void sysfs_remove_device_from_node(struct sys_device *dev, int nid) 517 { 518 struct node *node = &node_devices[nid]; 519 sysfs_remove_link(&node->sysdev.kobj, kobject_name(&dev->kobj)); 520 } 521 EXPORT_SYMBOL_GPL(sysfs_remove_device_from_node); 522 523 #else 524 static void register_nodes(void) 525 { 526 return; 527 } 528 529 #endif 530 531 /* Only valid if CPU is present. */ 532 static ssize_t show_physical_id(struct sys_device *dev, char *buf) 533 { 534 struct cpu *cpu = container_of(dev, struct cpu, sysdev); 535 536 return sprintf(buf, "%d\n", get_hard_smp_processor_id(cpu->sysdev.id)); 537 } 538 static SYSDEV_ATTR(physical_id, 0444, show_physical_id, NULL); 539 540 static int __init topology_init(void) 541 { 542 int cpu; 543 544 register_nodes(); 545 register_cpu_notifier(&sysfs_cpu_nb); 546 547 for_each_possible_cpu(cpu) { 548 struct cpu *c = &per_cpu(cpu_devices, cpu); 549 550 /* 551 * For now, we just see if the system supports making 552 * the RTAS calls for CPU hotplug. But, there may be a 553 * more comprehensive way to do this for an individual 554 * CPU. For instance, the boot cpu might never be valid 555 * for hotplugging. 556 */ 557 if (ppc_md.cpu_die) 558 c->hotpluggable = 1; 559 560 if (cpu_online(cpu) || c->hotpluggable) { 561 register_cpu(c, cpu); 562 563 sysdev_create_file(&c->sysdev, &attr_physical_id); 564 } 565 566 if (cpu_online(cpu)) 567 register_cpu_online(cpu); 568 } 569 570 return 0; 571 } 572 subsys_initcall(topology_init); 573