Linux 2.6.39-rc2
[pohmelfs.git] / arch / powerpc / kernel / sysfs.c
blobc0d8c2006bf4c7e29d37ef10863929d17d48f38f
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>
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/machdep.h>
19 #include <asm/smp.h>
20 #include <asm/pmc.h>
22 #include "cacheinfo.h"
24 #ifdef CONFIG_PPC64
25 #include <asm/paca.h>
26 #include <asm/lppaca.h>
27 #endif
29 static DEFINE_PER_CPU(struct cpu, cpu_devices);
32 * SMT snooze delay stuff, 64-bit only for now
35 #ifdef CONFIG_PPC64
37 /* Time in microseconds we delay before sleeping in the idle loop */
38 DEFINE_PER_CPU(long, smt_snooze_delay) = { 100 };
40 static ssize_t store_smt_snooze_delay(struct sys_device *dev,
41 struct sysdev_attribute *attr,
42 const char *buf,
43 size_t count)
45 struct cpu *cpu = container_of(dev, struct cpu, sysdev);
46 ssize_t ret;
47 long snooze;
49 ret = sscanf(buf, "%ld", &snooze);
50 if (ret != 1)
51 return -EINVAL;
53 per_cpu(smt_snooze_delay, cpu->sysdev.id) = snooze;
55 return count;
58 static ssize_t show_smt_snooze_delay(struct sys_device *dev,
59 struct sysdev_attribute *attr,
60 char *buf)
62 struct cpu *cpu = container_of(dev, struct cpu, sysdev);
64 return sprintf(buf, "%ld\n", per_cpu(smt_snooze_delay, cpu->sysdev.id));
67 static SYSDEV_ATTR(smt_snooze_delay, 0644, show_smt_snooze_delay,
68 store_smt_snooze_delay);
70 static int __init setup_smt_snooze_delay(char *str)
72 unsigned int cpu;
73 long snooze;
75 if (!cpu_has_feature(CPU_FTR_SMT))
76 return 1;
78 snooze = simple_strtol(str, NULL, 10);
79 for_each_possible_cpu(cpu)
80 per_cpu(smt_snooze_delay, cpu) = snooze;
82 return 1;
84 __setup("smt-snooze-delay=", setup_smt_snooze_delay);
86 #endif /* CONFIG_PPC64 */
89 * Enabling PMCs will slow partition context switch times so we only do
90 * it the first time we write to the PMCs.
93 static DEFINE_PER_CPU(char, pmcs_enabled);
95 void ppc_enable_pmcs(void)
97 ppc_set_pmu_inuse(1);
99 /* Only need to enable them once */
100 if (__get_cpu_var(pmcs_enabled))
101 return;
103 __get_cpu_var(pmcs_enabled) = 1;
105 if (ppc_md.enable_pmcs)
106 ppc_md.enable_pmcs();
108 EXPORT_SYMBOL(ppc_enable_pmcs);
110 #define SYSFS_PMCSETUP(NAME, ADDRESS) \
111 static void read_##NAME(void *val) \
113 *(unsigned long *)val = mfspr(ADDRESS); \
115 static void write_##NAME(void *val) \
117 ppc_enable_pmcs(); \
118 mtspr(ADDRESS, *(unsigned long *)val); \
120 static ssize_t show_##NAME(struct sys_device *dev, \
121 struct sysdev_attribute *attr, \
122 char *buf) \
124 struct cpu *cpu = container_of(dev, struct cpu, sysdev); \
125 unsigned long val; \
126 smp_call_function_single(cpu->sysdev.id, read_##NAME, &val, 1); \
127 return sprintf(buf, "%lx\n", val); \
129 static ssize_t __used \
130 store_##NAME(struct sys_device *dev, struct sysdev_attribute *attr, \
131 const char *buf, size_t count) \
133 struct cpu *cpu = container_of(dev, struct cpu, sysdev); \
134 unsigned long val; \
135 int ret = sscanf(buf, "%lx", &val); \
136 if (ret != 1) \
137 return -EINVAL; \
138 smp_call_function_single(cpu->sysdev.id, write_##NAME, &val, 1); \
139 return count; \
143 /* Let's define all possible registers, we'll only hook up the ones
144 * that are implemented on the current processor
147 #if defined(CONFIG_PPC64)
148 #define HAS_PPC_PMC_CLASSIC 1
149 #define HAS_PPC_PMC_IBM 1
150 #define HAS_PPC_PMC_PA6T 1
151 #elif defined(CONFIG_6xx)
152 #define HAS_PPC_PMC_CLASSIC 1
153 #define HAS_PPC_PMC_IBM 1
154 #define HAS_PPC_PMC_G4 1
155 #endif
158 #ifdef HAS_PPC_PMC_CLASSIC
159 SYSFS_PMCSETUP(mmcr0, SPRN_MMCR0);
160 SYSFS_PMCSETUP(mmcr1, SPRN_MMCR1);
161 SYSFS_PMCSETUP(pmc1, SPRN_PMC1);
162 SYSFS_PMCSETUP(pmc2, SPRN_PMC2);
163 SYSFS_PMCSETUP(pmc3, SPRN_PMC3);
164 SYSFS_PMCSETUP(pmc4, SPRN_PMC4);
165 SYSFS_PMCSETUP(pmc5, SPRN_PMC5);
166 SYSFS_PMCSETUP(pmc6, SPRN_PMC6);
168 #ifdef HAS_PPC_PMC_G4
169 SYSFS_PMCSETUP(mmcr2, SPRN_MMCR2);
170 #endif
172 #ifdef CONFIG_PPC64
173 SYSFS_PMCSETUP(pmc7, SPRN_PMC7);
174 SYSFS_PMCSETUP(pmc8, SPRN_PMC8);
176 SYSFS_PMCSETUP(mmcra, SPRN_MMCRA);
177 SYSFS_PMCSETUP(purr, SPRN_PURR);
178 SYSFS_PMCSETUP(spurr, SPRN_SPURR);
179 SYSFS_PMCSETUP(dscr, SPRN_DSCR);
181 static SYSDEV_ATTR(mmcra, 0600, show_mmcra, store_mmcra);
182 static SYSDEV_ATTR(spurr, 0600, show_spurr, NULL);
183 static SYSDEV_ATTR(dscr, 0600, show_dscr, store_dscr);
184 static SYSDEV_ATTR(purr, 0600, show_purr, store_purr);
185 #endif /* CONFIG_PPC64 */
187 #ifdef HAS_PPC_PMC_PA6T
188 SYSFS_PMCSETUP(pa6t_pmc0, SPRN_PA6T_PMC0);
189 SYSFS_PMCSETUP(pa6t_pmc1, SPRN_PA6T_PMC1);
190 SYSFS_PMCSETUP(pa6t_pmc2, SPRN_PA6T_PMC2);
191 SYSFS_PMCSETUP(pa6t_pmc3, SPRN_PA6T_PMC3);
192 SYSFS_PMCSETUP(pa6t_pmc4, SPRN_PA6T_PMC4);
193 SYSFS_PMCSETUP(pa6t_pmc5, SPRN_PA6T_PMC5);
194 #ifdef CONFIG_DEBUG_KERNEL
195 SYSFS_PMCSETUP(hid0, SPRN_HID0);
196 SYSFS_PMCSETUP(hid1, SPRN_HID1);
197 SYSFS_PMCSETUP(hid4, SPRN_HID4);
198 SYSFS_PMCSETUP(hid5, SPRN_HID5);
199 SYSFS_PMCSETUP(ima0, SPRN_PA6T_IMA0);
200 SYSFS_PMCSETUP(ima1, SPRN_PA6T_IMA1);
201 SYSFS_PMCSETUP(ima2, SPRN_PA6T_IMA2);
202 SYSFS_PMCSETUP(ima3, SPRN_PA6T_IMA3);
203 SYSFS_PMCSETUP(ima4, SPRN_PA6T_IMA4);
204 SYSFS_PMCSETUP(ima5, SPRN_PA6T_IMA5);
205 SYSFS_PMCSETUP(ima6, SPRN_PA6T_IMA6);
206 SYSFS_PMCSETUP(ima7, SPRN_PA6T_IMA7);
207 SYSFS_PMCSETUP(ima8, SPRN_PA6T_IMA8);
208 SYSFS_PMCSETUP(ima9, SPRN_PA6T_IMA9);
209 SYSFS_PMCSETUP(imaat, SPRN_PA6T_IMAAT);
210 SYSFS_PMCSETUP(btcr, SPRN_PA6T_BTCR);
211 SYSFS_PMCSETUP(pccr, SPRN_PA6T_PCCR);
212 SYSFS_PMCSETUP(rpccr, SPRN_PA6T_RPCCR);
213 SYSFS_PMCSETUP(der, SPRN_PA6T_DER);
214 SYSFS_PMCSETUP(mer, SPRN_PA6T_MER);
215 SYSFS_PMCSETUP(ber, SPRN_PA6T_BER);
216 SYSFS_PMCSETUP(ier, SPRN_PA6T_IER);
217 SYSFS_PMCSETUP(sier, SPRN_PA6T_SIER);
218 SYSFS_PMCSETUP(siar, SPRN_PA6T_SIAR);
219 SYSFS_PMCSETUP(tsr0, SPRN_PA6T_TSR0);
220 SYSFS_PMCSETUP(tsr1, SPRN_PA6T_TSR1);
221 SYSFS_PMCSETUP(tsr2, SPRN_PA6T_TSR2);
222 SYSFS_PMCSETUP(tsr3, SPRN_PA6T_TSR3);
223 #endif /* CONFIG_DEBUG_KERNEL */
224 #endif /* HAS_PPC_PMC_PA6T */
226 #ifdef HAS_PPC_PMC_IBM
227 static struct sysdev_attribute ibm_common_attrs[] = {
228 _SYSDEV_ATTR(mmcr0, 0600, show_mmcr0, store_mmcr0),
229 _SYSDEV_ATTR(mmcr1, 0600, show_mmcr1, store_mmcr1),
231 #endif /* HAS_PPC_PMC_G4 */
233 #ifdef HAS_PPC_PMC_G4
234 static struct sysdev_attribute g4_common_attrs[] = {
235 _SYSDEV_ATTR(mmcr0, 0600, show_mmcr0, store_mmcr0),
236 _SYSDEV_ATTR(mmcr1, 0600, show_mmcr1, store_mmcr1),
237 _SYSDEV_ATTR(mmcr2, 0600, show_mmcr2, store_mmcr2),
239 #endif /* HAS_PPC_PMC_G4 */
241 static struct sysdev_attribute classic_pmc_attrs[] = {
242 _SYSDEV_ATTR(pmc1, 0600, show_pmc1, store_pmc1),
243 _SYSDEV_ATTR(pmc2, 0600, show_pmc2, store_pmc2),
244 _SYSDEV_ATTR(pmc3, 0600, show_pmc3, store_pmc3),
245 _SYSDEV_ATTR(pmc4, 0600, show_pmc4, store_pmc4),
246 _SYSDEV_ATTR(pmc5, 0600, show_pmc5, store_pmc5),
247 _SYSDEV_ATTR(pmc6, 0600, show_pmc6, store_pmc6),
248 #ifdef CONFIG_PPC64
249 _SYSDEV_ATTR(pmc7, 0600, show_pmc7, store_pmc7),
250 _SYSDEV_ATTR(pmc8, 0600, show_pmc8, store_pmc8),
251 #endif
254 #ifdef HAS_PPC_PMC_PA6T
255 static struct sysdev_attribute pa6t_attrs[] = {
256 _SYSDEV_ATTR(mmcr0, 0600, show_mmcr0, store_mmcr0),
257 _SYSDEV_ATTR(mmcr1, 0600, show_mmcr1, store_mmcr1),
258 _SYSDEV_ATTR(pmc0, 0600, show_pa6t_pmc0, store_pa6t_pmc0),
259 _SYSDEV_ATTR(pmc1, 0600, show_pa6t_pmc1, store_pa6t_pmc1),
260 _SYSDEV_ATTR(pmc2, 0600, show_pa6t_pmc2, store_pa6t_pmc2),
261 _SYSDEV_ATTR(pmc3, 0600, show_pa6t_pmc3, store_pa6t_pmc3),
262 _SYSDEV_ATTR(pmc4, 0600, show_pa6t_pmc4, store_pa6t_pmc4),
263 _SYSDEV_ATTR(pmc5, 0600, show_pa6t_pmc5, store_pa6t_pmc5),
264 #ifdef CONFIG_DEBUG_KERNEL
265 _SYSDEV_ATTR(hid0, 0600, show_hid0, store_hid0),
266 _SYSDEV_ATTR(hid1, 0600, show_hid1, store_hid1),
267 _SYSDEV_ATTR(hid4, 0600, show_hid4, store_hid4),
268 _SYSDEV_ATTR(hid5, 0600, show_hid5, store_hid5),
269 _SYSDEV_ATTR(ima0, 0600, show_ima0, store_ima0),
270 _SYSDEV_ATTR(ima1, 0600, show_ima1, store_ima1),
271 _SYSDEV_ATTR(ima2, 0600, show_ima2, store_ima2),
272 _SYSDEV_ATTR(ima3, 0600, show_ima3, store_ima3),
273 _SYSDEV_ATTR(ima4, 0600, show_ima4, store_ima4),
274 _SYSDEV_ATTR(ima5, 0600, show_ima5, store_ima5),
275 _SYSDEV_ATTR(ima6, 0600, show_ima6, store_ima6),
276 _SYSDEV_ATTR(ima7, 0600, show_ima7, store_ima7),
277 _SYSDEV_ATTR(ima8, 0600, show_ima8, store_ima8),
278 _SYSDEV_ATTR(ima9, 0600, show_ima9, store_ima9),
279 _SYSDEV_ATTR(imaat, 0600, show_imaat, store_imaat),
280 _SYSDEV_ATTR(btcr, 0600, show_btcr, store_btcr),
281 _SYSDEV_ATTR(pccr, 0600, show_pccr, store_pccr),
282 _SYSDEV_ATTR(rpccr, 0600, show_rpccr, store_rpccr),
283 _SYSDEV_ATTR(der, 0600, show_der, store_der),
284 _SYSDEV_ATTR(mer, 0600, show_mer, store_mer),
285 _SYSDEV_ATTR(ber, 0600, show_ber, store_ber),
286 _SYSDEV_ATTR(ier, 0600, show_ier, store_ier),
287 _SYSDEV_ATTR(sier, 0600, show_sier, store_sier),
288 _SYSDEV_ATTR(siar, 0600, show_siar, store_siar),
289 _SYSDEV_ATTR(tsr0, 0600, show_tsr0, store_tsr0),
290 _SYSDEV_ATTR(tsr1, 0600, show_tsr1, store_tsr1),
291 _SYSDEV_ATTR(tsr2, 0600, show_tsr2, store_tsr2),
292 _SYSDEV_ATTR(tsr3, 0600, show_tsr3, store_tsr3),
293 #endif /* CONFIG_DEBUG_KERNEL */
295 #endif /* HAS_PPC_PMC_PA6T */
296 #endif /* HAS_PPC_PMC_CLASSIC */
298 static void __cpuinit register_cpu_online(unsigned int cpu)
300 struct cpu *c = &per_cpu(cpu_devices, cpu);
301 struct sys_device *s = &c->sysdev;
302 struct sysdev_attribute *attrs, *pmc_attrs;
303 int i, nattrs;
305 #ifdef CONFIG_PPC64
306 if (!firmware_has_feature(FW_FEATURE_ISERIES) &&
307 cpu_has_feature(CPU_FTR_SMT))
308 sysdev_create_file(s, &attr_smt_snooze_delay);
309 #endif
311 /* PMC stuff */
312 switch (cur_cpu_spec->pmc_type) {
313 #ifdef HAS_PPC_PMC_IBM
314 case PPC_PMC_IBM:
315 attrs = ibm_common_attrs;
316 nattrs = sizeof(ibm_common_attrs) / sizeof(struct sysdev_attribute);
317 pmc_attrs = classic_pmc_attrs;
318 break;
319 #endif /* HAS_PPC_PMC_IBM */
320 #ifdef HAS_PPC_PMC_G4
321 case PPC_PMC_G4:
322 attrs = g4_common_attrs;
323 nattrs = sizeof(g4_common_attrs) / sizeof(struct sysdev_attribute);
324 pmc_attrs = classic_pmc_attrs;
325 break;
326 #endif /* HAS_PPC_PMC_G4 */
327 #ifdef HAS_PPC_PMC_PA6T
328 case PPC_PMC_PA6T:
329 /* PA Semi starts counting at PMC0 */
330 attrs = pa6t_attrs;
331 nattrs = sizeof(pa6t_attrs) / sizeof(struct sysdev_attribute);
332 pmc_attrs = NULL;
333 break;
334 #endif /* HAS_PPC_PMC_PA6T */
335 default:
336 attrs = NULL;
337 nattrs = 0;
338 pmc_attrs = NULL;
341 for (i = 0; i < nattrs; i++)
342 sysdev_create_file(s, &attrs[i]);
344 if (pmc_attrs)
345 for (i = 0; i < cur_cpu_spec->num_pmcs; i++)
346 sysdev_create_file(s, &pmc_attrs[i]);
348 #ifdef CONFIG_PPC64
349 if (cpu_has_feature(CPU_FTR_MMCRA))
350 sysdev_create_file(s, &attr_mmcra);
352 if (cpu_has_feature(CPU_FTR_PURR))
353 sysdev_create_file(s, &attr_purr);
355 if (cpu_has_feature(CPU_FTR_SPURR))
356 sysdev_create_file(s, &attr_spurr);
358 if (cpu_has_feature(CPU_FTR_DSCR))
359 sysdev_create_file(s, &attr_dscr);
360 #endif /* CONFIG_PPC64 */
362 cacheinfo_cpu_online(cpu);
365 #ifdef CONFIG_HOTPLUG_CPU
366 static void unregister_cpu_online(unsigned int cpu)
368 struct cpu *c = &per_cpu(cpu_devices, cpu);
369 struct sys_device *s = &c->sysdev;
370 struct sysdev_attribute *attrs, *pmc_attrs;
371 int i, nattrs;
373 BUG_ON(!c->hotpluggable);
375 #ifdef CONFIG_PPC64
376 if (!firmware_has_feature(FW_FEATURE_ISERIES) &&
377 cpu_has_feature(CPU_FTR_SMT))
378 sysdev_remove_file(s, &attr_smt_snooze_delay);
379 #endif
381 /* PMC stuff */
382 switch (cur_cpu_spec->pmc_type) {
383 #ifdef HAS_PPC_PMC_IBM
384 case PPC_PMC_IBM:
385 attrs = ibm_common_attrs;
386 nattrs = sizeof(ibm_common_attrs) / sizeof(struct sysdev_attribute);
387 pmc_attrs = classic_pmc_attrs;
388 break;
389 #endif /* HAS_PPC_PMC_IBM */
390 #ifdef HAS_PPC_PMC_G4
391 case PPC_PMC_G4:
392 attrs = g4_common_attrs;
393 nattrs = sizeof(g4_common_attrs) / sizeof(struct sysdev_attribute);
394 pmc_attrs = classic_pmc_attrs;
395 break;
396 #endif /* HAS_PPC_PMC_G4 */
397 #ifdef HAS_PPC_PMC_PA6T
398 case PPC_PMC_PA6T:
399 /* PA Semi starts counting at PMC0 */
400 attrs = pa6t_attrs;
401 nattrs = sizeof(pa6t_attrs) / sizeof(struct sysdev_attribute);
402 pmc_attrs = NULL;
403 break;
404 #endif /* HAS_PPC_PMC_PA6T */
405 default:
406 attrs = NULL;
407 nattrs = 0;
408 pmc_attrs = NULL;
411 for (i = 0; i < nattrs; i++)
412 sysdev_remove_file(s, &attrs[i]);
414 if (pmc_attrs)
415 for (i = 0; i < cur_cpu_spec->num_pmcs; i++)
416 sysdev_remove_file(s, &pmc_attrs[i]);
418 #ifdef CONFIG_PPC64
419 if (cpu_has_feature(CPU_FTR_MMCRA))
420 sysdev_remove_file(s, &attr_mmcra);
422 if (cpu_has_feature(CPU_FTR_PURR))
423 sysdev_remove_file(s, &attr_purr);
425 if (cpu_has_feature(CPU_FTR_SPURR))
426 sysdev_remove_file(s, &attr_spurr);
428 if (cpu_has_feature(CPU_FTR_DSCR))
429 sysdev_remove_file(s, &attr_dscr);
430 #endif /* CONFIG_PPC64 */
432 cacheinfo_cpu_offline(cpu);
435 #ifdef CONFIG_ARCH_CPU_PROBE_RELEASE
436 ssize_t arch_cpu_probe(const char *buf, size_t count)
438 if (ppc_md.cpu_probe)
439 return ppc_md.cpu_probe(buf, count);
441 return -EINVAL;
444 ssize_t arch_cpu_release(const char *buf, size_t count)
446 if (ppc_md.cpu_release)
447 return ppc_md.cpu_release(buf, count);
449 return -EINVAL;
451 #endif /* CONFIG_ARCH_CPU_PROBE_RELEASE */
453 #endif /* CONFIG_HOTPLUG_CPU */
455 static int __cpuinit sysfs_cpu_notify(struct notifier_block *self,
456 unsigned long action, void *hcpu)
458 unsigned int cpu = (unsigned int)(long)hcpu;
460 switch (action) {
461 case CPU_ONLINE:
462 case CPU_ONLINE_FROZEN:
463 register_cpu_online(cpu);
464 break;
465 #ifdef CONFIG_HOTPLUG_CPU
466 case CPU_DEAD:
467 case CPU_DEAD_FROZEN:
468 unregister_cpu_online(cpu);
469 break;
470 #endif
472 return NOTIFY_OK;
475 static struct notifier_block __cpuinitdata sysfs_cpu_nb = {
476 .notifier_call = sysfs_cpu_notify,
479 static DEFINE_MUTEX(cpu_mutex);
481 int cpu_add_sysdev_attr(struct sysdev_attribute *attr)
483 int cpu;
485 mutex_lock(&cpu_mutex);
487 for_each_possible_cpu(cpu) {
488 sysdev_create_file(get_cpu_sysdev(cpu), attr);
491 mutex_unlock(&cpu_mutex);
492 return 0;
494 EXPORT_SYMBOL_GPL(cpu_add_sysdev_attr);
496 int cpu_add_sysdev_attr_group(struct attribute_group *attrs)
498 int cpu;
499 struct sys_device *sysdev;
500 int ret;
502 mutex_lock(&cpu_mutex);
504 for_each_possible_cpu(cpu) {
505 sysdev = get_cpu_sysdev(cpu);
506 ret = sysfs_create_group(&sysdev->kobj, attrs);
507 WARN_ON(ret != 0);
510 mutex_unlock(&cpu_mutex);
511 return 0;
513 EXPORT_SYMBOL_GPL(cpu_add_sysdev_attr_group);
516 void cpu_remove_sysdev_attr(struct sysdev_attribute *attr)
518 int cpu;
520 mutex_lock(&cpu_mutex);
522 for_each_possible_cpu(cpu) {
523 sysdev_remove_file(get_cpu_sysdev(cpu), attr);
526 mutex_unlock(&cpu_mutex);
528 EXPORT_SYMBOL_GPL(cpu_remove_sysdev_attr);
530 void cpu_remove_sysdev_attr_group(struct attribute_group *attrs)
532 int cpu;
533 struct sys_device *sysdev;
535 mutex_lock(&cpu_mutex);
537 for_each_possible_cpu(cpu) {
538 sysdev = get_cpu_sysdev(cpu);
539 sysfs_remove_group(&sysdev->kobj, attrs);
542 mutex_unlock(&cpu_mutex);
544 EXPORT_SYMBOL_GPL(cpu_remove_sysdev_attr_group);
547 /* NUMA stuff */
549 #ifdef CONFIG_NUMA
550 static void register_nodes(void)
552 int i;
554 for (i = 0; i < MAX_NUMNODES; i++)
555 register_one_node(i);
558 int sysfs_add_device_to_node(struct sys_device *dev, int nid)
560 struct node *node = &node_devices[nid];
561 return sysfs_create_link(&node->sysdev.kobj, &dev->kobj,
562 kobject_name(&dev->kobj));
564 EXPORT_SYMBOL_GPL(sysfs_add_device_to_node);
566 void sysfs_remove_device_from_node(struct sys_device *dev, int nid)
568 struct node *node = &node_devices[nid];
569 sysfs_remove_link(&node->sysdev.kobj, kobject_name(&dev->kobj));
571 EXPORT_SYMBOL_GPL(sysfs_remove_device_from_node);
573 #else
574 static void register_nodes(void)
576 return;
579 #endif
581 /* Only valid if CPU is present. */
582 static ssize_t show_physical_id(struct sys_device *dev,
583 struct sysdev_attribute *attr, char *buf)
585 struct cpu *cpu = container_of(dev, struct cpu, sysdev);
587 return sprintf(buf, "%d\n", get_hard_smp_processor_id(cpu->sysdev.id));
589 static SYSDEV_ATTR(physical_id, 0444, show_physical_id, NULL);
591 static int __init topology_init(void)
593 int cpu;
595 register_nodes();
596 register_cpu_notifier(&sysfs_cpu_nb);
598 for_each_possible_cpu(cpu) {
599 struct cpu *c = &per_cpu(cpu_devices, cpu);
602 * For now, we just see if the system supports making
603 * the RTAS calls for CPU hotplug. But, there may be a
604 * more comprehensive way to do this for an individual
605 * CPU. For instance, the boot cpu might never be valid
606 * for hotplugging.
608 if (ppc_md.cpu_die)
609 c->hotpluggable = 1;
611 if (cpu_online(cpu) || c->hotpluggable) {
612 register_cpu(c, cpu);
614 sysdev_create_file(&c->sysdev, &attr_physical_id);
617 if (cpu_online(cpu))
618 register_cpu_online(cpu);
621 return 0;
623 subsys_initcall(topology_init);