1 #include <linux/sysdev.h>
4 #include <linux/percpu.h>
5 #include <linux/init.h>
6 #include <linux/sched.h>
7 #include <linux/export.h>
8 #include <linux/nodemask.h>
9 #include <linux/cpumask.h>
10 #include <linux/notifier.h>
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>
18 #include <asm/machdep.h>
21 #include <asm/firmware.h>
23 #include "cacheinfo.h"
27 #include <asm/lppaca.h>
30 static DEFINE_PER_CPU(struct cpu, cpu_devices);
33 * SMT snooze delay stuff, 64-bit only for now
38 /* Time in microseconds we delay before sleeping in the idle loop */
39 DEFINE_PER_CPU(long, smt_snooze_delay) = { 100 };
41 static ssize_t store_smt_snooze_delay(struct sys_device *dev,
42 struct sysdev_attribute *attr,
46 struct cpu *cpu = container_of(dev, struct cpu, sysdev);
50 ret = sscanf(buf, "%ld", &snooze);
54 per_cpu(smt_snooze_delay, cpu->sysdev.id) = snooze;
59 static ssize_t show_smt_snooze_delay(struct sys_device *dev,
60 struct sysdev_attribute *attr,
63 struct cpu *cpu = container_of(dev, struct cpu, sysdev);
65 return sprintf(buf, "%ld\n", per_cpu(smt_snooze_delay, cpu->sysdev.id));
68 static SYSDEV_ATTR(smt_snooze_delay, 0644, show_smt_snooze_delay,
69 store_smt_snooze_delay);
71 static int __init setup_smt_snooze_delay(char *str)
76 if (!cpu_has_feature(CPU_FTR_SMT))
79 snooze = simple_strtol(str, NULL, 10);
80 for_each_possible_cpu(cpu)
81 per_cpu(smt_snooze_delay, cpu) = snooze;
85 __setup("smt-snooze-delay=", setup_smt_snooze_delay);
87 #endif /* CONFIG_PPC64 */
90 * Enabling PMCs will slow partition context switch times so we only do
91 * it the first time we write to the PMCs.
94 static DEFINE_PER_CPU(char, pmcs_enabled);
96 void ppc_enable_pmcs(void)
100 /* Only need to enable them once */
101 if (__get_cpu_var(pmcs_enabled))
104 __get_cpu_var(pmcs_enabled) = 1;
106 if (ppc_md.enable_pmcs)
107 ppc_md.enable_pmcs();
109 EXPORT_SYMBOL(ppc_enable_pmcs);
111 #define SYSFS_PMCSETUP(NAME, ADDRESS) \
112 static void read_##NAME(void *val) \
114 *(unsigned long *)val = mfspr(ADDRESS); \
116 static void write_##NAME(void *val) \
119 mtspr(ADDRESS, *(unsigned long *)val); \
121 static ssize_t show_##NAME(struct sys_device *dev, \
122 struct sysdev_attribute *attr, \
125 struct cpu *cpu = container_of(dev, struct cpu, sysdev); \
127 smp_call_function_single(cpu->sysdev.id, read_##NAME, &val, 1); \
128 return sprintf(buf, "%lx\n", val); \
130 static ssize_t __used \
131 store_##NAME(struct sys_device *dev, struct sysdev_attribute *attr, \
132 const char *buf, size_t count) \
134 struct cpu *cpu = container_of(dev, struct cpu, sysdev); \
136 int ret = sscanf(buf, "%lx", &val); \
139 smp_call_function_single(cpu->sysdev.id, write_##NAME, &val, 1); \
144 /* Let's define all possible registers, we'll only hook up the ones
145 * that are implemented on the current processor
148 #if defined(CONFIG_PPC64)
149 #define HAS_PPC_PMC_CLASSIC 1
150 #define HAS_PPC_PMC_IBM 1
151 #define HAS_PPC_PMC_PA6T 1
152 #elif defined(CONFIG_6xx)
153 #define HAS_PPC_PMC_CLASSIC 1
154 #define HAS_PPC_PMC_IBM 1
155 #define HAS_PPC_PMC_G4 1
159 #ifdef HAS_PPC_PMC_CLASSIC
160 SYSFS_PMCSETUP(mmcr0, SPRN_MMCR0);
161 SYSFS_PMCSETUP(mmcr1, SPRN_MMCR1);
162 SYSFS_PMCSETUP(pmc1, SPRN_PMC1);
163 SYSFS_PMCSETUP(pmc2, SPRN_PMC2);
164 SYSFS_PMCSETUP(pmc3, SPRN_PMC3);
165 SYSFS_PMCSETUP(pmc4, SPRN_PMC4);
166 SYSFS_PMCSETUP(pmc5, SPRN_PMC5);
167 SYSFS_PMCSETUP(pmc6, SPRN_PMC6);
169 #ifdef HAS_PPC_PMC_G4
170 SYSFS_PMCSETUP(mmcr2, SPRN_MMCR2);
174 SYSFS_PMCSETUP(pmc7, SPRN_PMC7);
175 SYSFS_PMCSETUP(pmc8, SPRN_PMC8);
177 SYSFS_PMCSETUP(mmcra, SPRN_MMCRA);
178 SYSFS_PMCSETUP(purr, SPRN_PURR);
179 SYSFS_PMCSETUP(spurr, SPRN_SPURR);
180 SYSFS_PMCSETUP(dscr, SPRN_DSCR);
183 Lets only enable read for phyp resources and
184 enable write when needed with a separate function.
185 Lets be conservative and default to pseries.
187 static SYSDEV_ATTR(mmcra, 0600, show_mmcra, store_mmcra);
188 static SYSDEV_ATTR(spurr, 0600, show_spurr, NULL);
189 static SYSDEV_ATTR(dscr, 0600, show_dscr, store_dscr);
190 static SYSDEV_ATTR(purr, 0400, show_purr, store_purr);
192 unsigned long dscr_default = 0;
193 EXPORT_SYMBOL(dscr_default);
195 static void add_write_permission_dev_attr(struct sysdev_attribute *attr)
197 attr->attr.mode |= 0200;
200 static ssize_t show_dscr_default(struct sysdev_class *class,
201 struct sysdev_class_attribute *attr, char *buf)
203 return sprintf(buf, "%lx\n", dscr_default);
206 static void update_dscr(void *dummy)
208 if (!current->thread.dscr_inherit) {
209 current->thread.dscr = dscr_default;
210 mtspr(SPRN_DSCR, dscr_default);
214 static ssize_t __used store_dscr_default(struct sysdev_class *class,
215 struct sysdev_class_attribute *attr, const char *buf,
221 ret = sscanf(buf, "%lx", &val);
226 on_each_cpu(update_dscr, NULL, 1);
231 static SYSDEV_CLASS_ATTR(dscr_default, 0600,
232 show_dscr_default, store_dscr_default);
234 static void sysfs_create_dscr_default(void)
237 if (cpu_has_feature(CPU_FTR_DSCR))
238 err = sysfs_create_file(&cpu_sysdev_class.kset.kobj,
239 &attr_dscr_default.attr);
241 #endif /* CONFIG_PPC64 */
243 #ifdef HAS_PPC_PMC_PA6T
244 SYSFS_PMCSETUP(pa6t_pmc0, SPRN_PA6T_PMC0);
245 SYSFS_PMCSETUP(pa6t_pmc1, SPRN_PA6T_PMC1);
246 SYSFS_PMCSETUP(pa6t_pmc2, SPRN_PA6T_PMC2);
247 SYSFS_PMCSETUP(pa6t_pmc3, SPRN_PA6T_PMC3);
248 SYSFS_PMCSETUP(pa6t_pmc4, SPRN_PA6T_PMC4);
249 SYSFS_PMCSETUP(pa6t_pmc5, SPRN_PA6T_PMC5);
250 #ifdef CONFIG_DEBUG_KERNEL
251 SYSFS_PMCSETUP(hid0, SPRN_HID0);
252 SYSFS_PMCSETUP(hid1, SPRN_HID1);
253 SYSFS_PMCSETUP(hid4, SPRN_HID4);
254 SYSFS_PMCSETUP(hid5, SPRN_HID5);
255 SYSFS_PMCSETUP(ima0, SPRN_PA6T_IMA0);
256 SYSFS_PMCSETUP(ima1, SPRN_PA6T_IMA1);
257 SYSFS_PMCSETUP(ima2, SPRN_PA6T_IMA2);
258 SYSFS_PMCSETUP(ima3, SPRN_PA6T_IMA3);
259 SYSFS_PMCSETUP(ima4, SPRN_PA6T_IMA4);
260 SYSFS_PMCSETUP(ima5, SPRN_PA6T_IMA5);
261 SYSFS_PMCSETUP(ima6, SPRN_PA6T_IMA6);
262 SYSFS_PMCSETUP(ima7, SPRN_PA6T_IMA7);
263 SYSFS_PMCSETUP(ima8, SPRN_PA6T_IMA8);
264 SYSFS_PMCSETUP(ima9, SPRN_PA6T_IMA9);
265 SYSFS_PMCSETUP(imaat, SPRN_PA6T_IMAAT);
266 SYSFS_PMCSETUP(btcr, SPRN_PA6T_BTCR);
267 SYSFS_PMCSETUP(pccr, SPRN_PA6T_PCCR);
268 SYSFS_PMCSETUP(rpccr, SPRN_PA6T_RPCCR);
269 SYSFS_PMCSETUP(der, SPRN_PA6T_DER);
270 SYSFS_PMCSETUP(mer, SPRN_PA6T_MER);
271 SYSFS_PMCSETUP(ber, SPRN_PA6T_BER);
272 SYSFS_PMCSETUP(ier, SPRN_PA6T_IER);
273 SYSFS_PMCSETUP(sier, SPRN_PA6T_SIER);
274 SYSFS_PMCSETUP(siar, SPRN_PA6T_SIAR);
275 SYSFS_PMCSETUP(tsr0, SPRN_PA6T_TSR0);
276 SYSFS_PMCSETUP(tsr1, SPRN_PA6T_TSR1);
277 SYSFS_PMCSETUP(tsr2, SPRN_PA6T_TSR2);
278 SYSFS_PMCSETUP(tsr3, SPRN_PA6T_TSR3);
279 #endif /* CONFIG_DEBUG_KERNEL */
280 #endif /* HAS_PPC_PMC_PA6T */
282 #ifdef HAS_PPC_PMC_IBM
283 static struct sysdev_attribute ibm_common_attrs[] = {
284 _SYSDEV_ATTR(mmcr0, 0600, show_mmcr0, store_mmcr0),
285 _SYSDEV_ATTR(mmcr1, 0600, show_mmcr1, store_mmcr1),
287 #endif /* HAS_PPC_PMC_G4 */
289 #ifdef HAS_PPC_PMC_G4
290 static struct sysdev_attribute g4_common_attrs[] = {
291 _SYSDEV_ATTR(mmcr0, 0600, show_mmcr0, store_mmcr0),
292 _SYSDEV_ATTR(mmcr1, 0600, show_mmcr1, store_mmcr1),
293 _SYSDEV_ATTR(mmcr2, 0600, show_mmcr2, store_mmcr2),
295 #endif /* HAS_PPC_PMC_G4 */
297 static struct sysdev_attribute classic_pmc_attrs[] = {
298 _SYSDEV_ATTR(pmc1, 0600, show_pmc1, store_pmc1),
299 _SYSDEV_ATTR(pmc2, 0600, show_pmc2, store_pmc2),
300 _SYSDEV_ATTR(pmc3, 0600, show_pmc3, store_pmc3),
301 _SYSDEV_ATTR(pmc4, 0600, show_pmc4, store_pmc4),
302 _SYSDEV_ATTR(pmc5, 0600, show_pmc5, store_pmc5),
303 _SYSDEV_ATTR(pmc6, 0600, show_pmc6, store_pmc6),
305 _SYSDEV_ATTR(pmc7, 0600, show_pmc7, store_pmc7),
306 _SYSDEV_ATTR(pmc8, 0600, show_pmc8, store_pmc8),
310 #ifdef HAS_PPC_PMC_PA6T
311 static struct sysdev_attribute pa6t_attrs[] = {
312 _SYSDEV_ATTR(mmcr0, 0600, show_mmcr0, store_mmcr0),
313 _SYSDEV_ATTR(mmcr1, 0600, show_mmcr1, store_mmcr1),
314 _SYSDEV_ATTR(pmc0, 0600, show_pa6t_pmc0, store_pa6t_pmc0),
315 _SYSDEV_ATTR(pmc1, 0600, show_pa6t_pmc1, store_pa6t_pmc1),
316 _SYSDEV_ATTR(pmc2, 0600, show_pa6t_pmc2, store_pa6t_pmc2),
317 _SYSDEV_ATTR(pmc3, 0600, show_pa6t_pmc3, store_pa6t_pmc3),
318 _SYSDEV_ATTR(pmc4, 0600, show_pa6t_pmc4, store_pa6t_pmc4),
319 _SYSDEV_ATTR(pmc5, 0600, show_pa6t_pmc5, store_pa6t_pmc5),
320 #ifdef CONFIG_DEBUG_KERNEL
321 _SYSDEV_ATTR(hid0, 0600, show_hid0, store_hid0),
322 _SYSDEV_ATTR(hid1, 0600, show_hid1, store_hid1),
323 _SYSDEV_ATTR(hid4, 0600, show_hid4, store_hid4),
324 _SYSDEV_ATTR(hid5, 0600, show_hid5, store_hid5),
325 _SYSDEV_ATTR(ima0, 0600, show_ima0, store_ima0),
326 _SYSDEV_ATTR(ima1, 0600, show_ima1, store_ima1),
327 _SYSDEV_ATTR(ima2, 0600, show_ima2, store_ima2),
328 _SYSDEV_ATTR(ima3, 0600, show_ima3, store_ima3),
329 _SYSDEV_ATTR(ima4, 0600, show_ima4, store_ima4),
330 _SYSDEV_ATTR(ima5, 0600, show_ima5, store_ima5),
331 _SYSDEV_ATTR(ima6, 0600, show_ima6, store_ima6),
332 _SYSDEV_ATTR(ima7, 0600, show_ima7, store_ima7),
333 _SYSDEV_ATTR(ima8, 0600, show_ima8, store_ima8),
334 _SYSDEV_ATTR(ima9, 0600, show_ima9, store_ima9),
335 _SYSDEV_ATTR(imaat, 0600, show_imaat, store_imaat),
336 _SYSDEV_ATTR(btcr, 0600, show_btcr, store_btcr),
337 _SYSDEV_ATTR(pccr, 0600, show_pccr, store_pccr),
338 _SYSDEV_ATTR(rpccr, 0600, show_rpccr, store_rpccr),
339 _SYSDEV_ATTR(der, 0600, show_der, store_der),
340 _SYSDEV_ATTR(mer, 0600, show_mer, store_mer),
341 _SYSDEV_ATTR(ber, 0600, show_ber, store_ber),
342 _SYSDEV_ATTR(ier, 0600, show_ier, store_ier),
343 _SYSDEV_ATTR(sier, 0600, show_sier, store_sier),
344 _SYSDEV_ATTR(siar, 0600, show_siar, store_siar),
345 _SYSDEV_ATTR(tsr0, 0600, show_tsr0, store_tsr0),
346 _SYSDEV_ATTR(tsr1, 0600, show_tsr1, store_tsr1),
347 _SYSDEV_ATTR(tsr2, 0600, show_tsr2, store_tsr2),
348 _SYSDEV_ATTR(tsr3, 0600, show_tsr3, store_tsr3),
349 #endif /* CONFIG_DEBUG_KERNEL */
351 #endif /* HAS_PPC_PMC_PA6T */
352 #endif /* HAS_PPC_PMC_CLASSIC */
354 static void __cpuinit register_cpu_online(unsigned int cpu)
356 struct cpu *c = &per_cpu(cpu_devices, cpu);
357 struct sys_device *s = &c->sysdev;
358 struct sysdev_attribute *attrs, *pmc_attrs;
362 if (!firmware_has_feature(FW_FEATURE_ISERIES) &&
363 cpu_has_feature(CPU_FTR_SMT))
364 sysdev_create_file(s, &attr_smt_snooze_delay);
368 switch (cur_cpu_spec->pmc_type) {
369 #ifdef HAS_PPC_PMC_IBM
371 attrs = ibm_common_attrs;
372 nattrs = sizeof(ibm_common_attrs) / sizeof(struct sysdev_attribute);
373 pmc_attrs = classic_pmc_attrs;
375 #endif /* HAS_PPC_PMC_IBM */
376 #ifdef HAS_PPC_PMC_G4
378 attrs = g4_common_attrs;
379 nattrs = sizeof(g4_common_attrs) / sizeof(struct sysdev_attribute);
380 pmc_attrs = classic_pmc_attrs;
382 #endif /* HAS_PPC_PMC_G4 */
383 #ifdef HAS_PPC_PMC_PA6T
385 /* PA Semi starts counting at PMC0 */
387 nattrs = sizeof(pa6t_attrs) / sizeof(struct sysdev_attribute);
390 #endif /* HAS_PPC_PMC_PA6T */
397 for (i = 0; i < nattrs; i++)
398 sysdev_create_file(s, &attrs[i]);
401 for (i = 0; i < cur_cpu_spec->num_pmcs; i++)
402 sysdev_create_file(s, &pmc_attrs[i]);
405 if (cpu_has_feature(CPU_FTR_MMCRA))
406 sysdev_create_file(s, &attr_mmcra);
408 if (cpu_has_feature(CPU_FTR_PURR)) {
409 if (!firmware_has_feature(FW_FEATURE_LPAR))
410 add_write_permission_dev_attr(&attr_purr);
411 sysdev_create_file(s, &attr_purr);
414 if (cpu_has_feature(CPU_FTR_SPURR))
415 sysdev_create_file(s, &attr_spurr);
417 if (cpu_has_feature(CPU_FTR_DSCR))
418 sysdev_create_file(s, &attr_dscr);
419 #endif /* CONFIG_PPC64 */
421 cacheinfo_cpu_online(cpu);
424 #ifdef CONFIG_HOTPLUG_CPU
425 static void unregister_cpu_online(unsigned int cpu)
427 struct cpu *c = &per_cpu(cpu_devices, cpu);
428 struct sys_device *s = &c->sysdev;
429 struct sysdev_attribute *attrs, *pmc_attrs;
432 BUG_ON(!c->hotpluggable);
435 if (!firmware_has_feature(FW_FEATURE_ISERIES) &&
436 cpu_has_feature(CPU_FTR_SMT))
437 sysdev_remove_file(s, &attr_smt_snooze_delay);
441 switch (cur_cpu_spec->pmc_type) {
442 #ifdef HAS_PPC_PMC_IBM
444 attrs = ibm_common_attrs;
445 nattrs = sizeof(ibm_common_attrs) / sizeof(struct sysdev_attribute);
446 pmc_attrs = classic_pmc_attrs;
448 #endif /* HAS_PPC_PMC_IBM */
449 #ifdef HAS_PPC_PMC_G4
451 attrs = g4_common_attrs;
452 nattrs = sizeof(g4_common_attrs) / sizeof(struct sysdev_attribute);
453 pmc_attrs = classic_pmc_attrs;
455 #endif /* HAS_PPC_PMC_G4 */
456 #ifdef HAS_PPC_PMC_PA6T
458 /* PA Semi starts counting at PMC0 */
460 nattrs = sizeof(pa6t_attrs) / sizeof(struct sysdev_attribute);
463 #endif /* HAS_PPC_PMC_PA6T */
470 for (i = 0; i < nattrs; i++)
471 sysdev_remove_file(s, &attrs[i]);
474 for (i = 0; i < cur_cpu_spec->num_pmcs; i++)
475 sysdev_remove_file(s, &pmc_attrs[i]);
478 if (cpu_has_feature(CPU_FTR_MMCRA))
479 sysdev_remove_file(s, &attr_mmcra);
481 if (cpu_has_feature(CPU_FTR_PURR))
482 sysdev_remove_file(s, &attr_purr);
484 if (cpu_has_feature(CPU_FTR_SPURR))
485 sysdev_remove_file(s, &attr_spurr);
487 if (cpu_has_feature(CPU_FTR_DSCR))
488 sysdev_remove_file(s, &attr_dscr);
489 #endif /* CONFIG_PPC64 */
491 cacheinfo_cpu_offline(cpu);
494 #ifdef CONFIG_ARCH_CPU_PROBE_RELEASE
495 ssize_t arch_cpu_probe(const char *buf, size_t count)
497 if (ppc_md.cpu_probe)
498 return ppc_md.cpu_probe(buf, count);
503 ssize_t arch_cpu_release(const char *buf, size_t count)
505 if (ppc_md.cpu_release)
506 return ppc_md.cpu_release(buf, count);
510 #endif /* CONFIG_ARCH_CPU_PROBE_RELEASE */
512 #endif /* CONFIG_HOTPLUG_CPU */
514 static int __cpuinit sysfs_cpu_notify(struct notifier_block *self,
515 unsigned long action, void *hcpu)
517 unsigned int cpu = (unsigned int)(long)hcpu;
521 case CPU_ONLINE_FROZEN:
522 register_cpu_online(cpu);
524 #ifdef CONFIG_HOTPLUG_CPU
526 case CPU_DEAD_FROZEN:
527 unregister_cpu_online(cpu);
534 static struct notifier_block __cpuinitdata sysfs_cpu_nb = {
535 .notifier_call = sysfs_cpu_notify,
538 static DEFINE_MUTEX(cpu_mutex);
540 int cpu_add_sysdev_attr(struct sysdev_attribute *attr)
544 mutex_lock(&cpu_mutex);
546 for_each_possible_cpu(cpu) {
547 sysdev_create_file(get_cpu_sysdev(cpu), attr);
550 mutex_unlock(&cpu_mutex);
553 EXPORT_SYMBOL_GPL(cpu_add_sysdev_attr);
555 int cpu_add_sysdev_attr_group(struct attribute_group *attrs)
558 struct sys_device *sysdev;
561 mutex_lock(&cpu_mutex);
563 for_each_possible_cpu(cpu) {
564 sysdev = get_cpu_sysdev(cpu);
565 ret = sysfs_create_group(&sysdev->kobj, attrs);
569 mutex_unlock(&cpu_mutex);
572 EXPORT_SYMBOL_GPL(cpu_add_sysdev_attr_group);
575 void cpu_remove_sysdev_attr(struct sysdev_attribute *attr)
579 mutex_lock(&cpu_mutex);
581 for_each_possible_cpu(cpu) {
582 sysdev_remove_file(get_cpu_sysdev(cpu), attr);
585 mutex_unlock(&cpu_mutex);
587 EXPORT_SYMBOL_GPL(cpu_remove_sysdev_attr);
589 void cpu_remove_sysdev_attr_group(struct attribute_group *attrs)
592 struct sys_device *sysdev;
594 mutex_lock(&cpu_mutex);
596 for_each_possible_cpu(cpu) {
597 sysdev = get_cpu_sysdev(cpu);
598 sysfs_remove_group(&sysdev->kobj, attrs);
601 mutex_unlock(&cpu_mutex);
603 EXPORT_SYMBOL_GPL(cpu_remove_sysdev_attr_group);
609 static void register_nodes(void)
613 for (i = 0; i < MAX_NUMNODES; i++)
614 register_one_node(i);
617 int sysfs_add_device_to_node(struct sys_device *dev, int nid)
619 struct node *node = &node_devices[nid];
620 return sysfs_create_link(&node->dev.kobj, &dev->kobj,
621 kobject_name(&dev->kobj));
623 EXPORT_SYMBOL_GPL(sysfs_add_device_to_node);
625 void sysfs_remove_device_from_node(struct sys_device *dev, int nid)
627 struct node *node = &node_devices[nid];
628 sysfs_remove_link(&node->dev.kobj, kobject_name(&dev->kobj));
630 EXPORT_SYMBOL_GPL(sysfs_remove_device_from_node);
633 static void register_nodes(void)
640 /* Only valid if CPU is present. */
641 static ssize_t show_physical_id(struct sys_device *dev,
642 struct sysdev_attribute *attr, char *buf)
644 struct cpu *cpu = container_of(dev, struct cpu, sysdev);
646 return sprintf(buf, "%d\n", get_hard_smp_processor_id(cpu->sysdev.id));
648 static SYSDEV_ATTR(physical_id, 0444, show_physical_id, NULL);
650 static int __init topology_init(void)
655 register_cpu_notifier(&sysfs_cpu_nb);
657 for_each_possible_cpu(cpu) {
658 struct cpu *c = &per_cpu(cpu_devices, cpu);
661 * For now, we just see if the system supports making
662 * the RTAS calls for CPU hotplug. But, there may be a
663 * more comprehensive way to do this for an individual
664 * CPU. For instance, the boot cpu might never be valid
670 if (cpu_online(cpu) || c->hotpluggable) {
671 register_cpu(c, cpu);
673 sysdev_create_file(&c->sysdev, &attr_physical_id);
677 register_cpu_online(cpu);
680 sysfs_create_dscr_default();
681 #endif /* CONFIG_PPC64 */
685 subsys_initcall(topology_init);