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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/export.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/machdep.h>
19 #include <asm/smp.h>
20 #include <asm/pmc.h>
21 #include <asm/system.h>
22
23 #include "cacheinfo.h"
24
25 #ifdef CONFIG_PPC64
26 #include <asm/paca.h>
27 #include <asm/lppaca.h>
28 #endif
29
30 static DEFINE_PER_CPU(struct cpu, cpu_devices);
31
32 /*
33 * SMT snooze delay stuff, 64-bit only for now
34 */
35
36 #ifdef CONFIG_PPC64
37
38 /* Time in microseconds we delay before sleeping in the idle loop */
39 DEFINE_PER_CPU(long, smt_snooze_delay) = { 100 };
40
41 static ssize_t store_smt_snooze_delay(struct sys_device *dev,
42 struct sysdev_attribute *attr,
43 const char *buf,
44 size_t count)
45 {
46 struct cpu *cpu = container_of(dev, struct cpu, sysdev);
47 ssize_t ret;
48 long snooze;
49
50 ret = sscanf(buf, "%ld", &snooze);
51 if (ret != 1)
52 return -EINVAL;
53
54 per_cpu(smt_snooze_delay, cpu->sysdev.id) = snooze;
55 update_smt_snooze_delay(snooze);
56
57 return count;
58 }
59
60 static ssize_t show_smt_snooze_delay(struct sys_device *dev,
61 struct sysdev_attribute *attr,
62 char *buf)
63 {
64 struct cpu *cpu = container_of(dev, struct cpu, sysdev);
65
66 return sprintf(buf, "%ld\n", per_cpu(smt_snooze_delay, cpu->sysdev.id));
67 }
68
69 static SYSDEV_ATTR(smt_snooze_delay, 0644, show_smt_snooze_delay,
70 store_smt_snooze_delay);
71
72 static int __init setup_smt_snooze_delay(char *str)
73 {
74 unsigned int cpu;
75 long snooze;
76
77 if (!cpu_has_feature(CPU_FTR_SMT))
78 return 1;
79
80 snooze = simple_strtol(str, NULL, 10);
81 for_each_possible_cpu(cpu)
82 per_cpu(smt_snooze_delay, cpu) = snooze;
83
84 return 1;
85 }
86 __setup("smt-snooze-delay=", setup_smt_snooze_delay);
87
88 #endif /* CONFIG_PPC64 */
89
90 /*
91 * Enabling PMCs will slow partition context switch times so we only do
92 * it the first time we write to the PMCs.
93 */
94
95 static DEFINE_PER_CPU(char, pmcs_enabled);
96
97 void ppc_enable_pmcs(void)
98 {
99 ppc_set_pmu_inuse(1);
100
101 /* Only need to enable them once */
102 if (__get_cpu_var(pmcs_enabled))
103 return;
104
105 __get_cpu_var(pmcs_enabled) = 1;
106
107 if (ppc_md.enable_pmcs)
108 ppc_md.enable_pmcs();
109 }
110 EXPORT_SYMBOL(ppc_enable_pmcs);
111
112 #define SYSFS_PMCSETUP(NAME, ADDRESS) \
113 static void read_##NAME(void *val) \
114 { \
115 *(unsigned long *)val = mfspr(ADDRESS); \
116 } \
117 static void write_##NAME(void *val) \
118 { \
119 ppc_enable_pmcs(); \
120 mtspr(ADDRESS, *(unsigned long *)val); \
121 } \
122 static ssize_t show_##NAME(struct sys_device *dev, \
123 struct sysdev_attribute *attr, \
124 char *buf) \
125 { \
126 struct cpu *cpu = container_of(dev, struct cpu, sysdev); \
127 unsigned long val; \
128 smp_call_function_single(cpu->sysdev.id, read_##NAME, &val, 1); \
129 return sprintf(buf, "%lx\n", val); \
130 } \
131 static ssize_t __used \
132 store_##NAME(struct sys_device *dev, struct sysdev_attribute *attr, \
133 const char *buf, size_t count) \
134 { \
135 struct cpu *cpu = container_of(dev, struct cpu, sysdev); \
136 unsigned long val; \
137 int ret = sscanf(buf, "%lx", &val); \
138 if (ret != 1) \
139 return -EINVAL; \
140 smp_call_function_single(cpu->sysdev.id, write_##NAME, &val, 1); \
141 return count; \
142 }
143
144
145 /* Let's define all possible registers, we'll only hook up the ones
146 * that are implemented on the current processor
147 */
148
149 #if defined(CONFIG_PPC64)
150 #define HAS_PPC_PMC_CLASSIC 1
151 #define HAS_PPC_PMC_IBM 1
152 #define HAS_PPC_PMC_PA6T 1
153 #elif defined(CONFIG_6xx)
154 #define HAS_PPC_PMC_CLASSIC 1
155 #define HAS_PPC_PMC_IBM 1
156 #define HAS_PPC_PMC_G4 1
157 #endif
158
159
160 #ifdef HAS_PPC_PMC_CLASSIC
161 SYSFS_PMCSETUP(mmcr0, SPRN_MMCR0);
162 SYSFS_PMCSETUP(mmcr1, SPRN_MMCR1);
163 SYSFS_PMCSETUP(pmc1, SPRN_PMC1);
164 SYSFS_PMCSETUP(pmc2, SPRN_PMC2);
165 SYSFS_PMCSETUP(pmc3, SPRN_PMC3);
166 SYSFS_PMCSETUP(pmc4, SPRN_PMC4);
167 SYSFS_PMCSETUP(pmc5, SPRN_PMC5);
168 SYSFS_PMCSETUP(pmc6, SPRN_PMC6);
169
170 #ifdef HAS_PPC_PMC_G4
171 SYSFS_PMCSETUP(mmcr2, SPRN_MMCR2);
172 #endif
173
174 #ifdef CONFIG_PPC64
175 SYSFS_PMCSETUP(pmc7, SPRN_PMC7);
176 SYSFS_PMCSETUP(pmc8, SPRN_PMC8);
177
178 SYSFS_PMCSETUP(mmcra, SPRN_MMCRA);
179 SYSFS_PMCSETUP(purr, SPRN_PURR);
180 SYSFS_PMCSETUP(spurr, SPRN_SPURR);
181 SYSFS_PMCSETUP(dscr, SPRN_DSCR);
182 SYSFS_PMCSETUP(pir, SPRN_PIR);
183
184 static SYSDEV_ATTR(mmcra, 0600, show_mmcra, store_mmcra);
185 static SYSDEV_ATTR(spurr, 0600, show_spurr, NULL);
186 static SYSDEV_ATTR(dscr, 0600, show_dscr, store_dscr);
187 static SYSDEV_ATTR(purr, 0600, show_purr, store_purr);
188 static SYSDEV_ATTR(pir, 0400, show_pir, NULL);
189
190 unsigned long dscr_default = 0;
191 EXPORT_SYMBOL(dscr_default);
192
193 static ssize_t show_dscr_default(struct sysdev_class *class,
194 struct sysdev_class_attribute *attr, char *buf)
195 {
196 return sprintf(buf, "%lx\n", dscr_default);
197 }
198
199 static ssize_t __used store_dscr_default(struct sysdev_class *class,
200 struct sysdev_class_attribute *attr, const char *buf,
201 size_t count)
202 {
203 unsigned long val;
204 int ret = 0;
205
206 ret = sscanf(buf, "%lx", &val);
207 if (ret != 1)
208 return -EINVAL;
209 dscr_default = val;
210
211 return count;
212 }
213
214 static SYSDEV_CLASS_ATTR(dscr_default, 0600,
215 show_dscr_default, store_dscr_default);
216
217 static void sysfs_create_dscr_default(void)
218 {
219 int err = 0;
220 if (cpu_has_feature(CPU_FTR_DSCR))
221 err = sysfs_create_file(&cpu_sysdev_class.kset.kobj,
222 &attr_dscr_default.attr);
223 }
224 #endif /* CONFIG_PPC64 */
225
226 #ifdef HAS_PPC_PMC_PA6T
227 SYSFS_PMCSETUP(pa6t_pmc0, SPRN_PA6T_PMC0);
228 SYSFS_PMCSETUP(pa6t_pmc1, SPRN_PA6T_PMC1);
229 SYSFS_PMCSETUP(pa6t_pmc2, SPRN_PA6T_PMC2);
230 SYSFS_PMCSETUP(pa6t_pmc3, SPRN_PA6T_PMC3);
231 SYSFS_PMCSETUP(pa6t_pmc4, SPRN_PA6T_PMC4);
232 SYSFS_PMCSETUP(pa6t_pmc5, SPRN_PA6T_PMC5);
233 #ifdef CONFIG_DEBUG_KERNEL
234 SYSFS_PMCSETUP(hid0, SPRN_HID0);
235 SYSFS_PMCSETUP(hid1, SPRN_HID1);
236 SYSFS_PMCSETUP(hid4, SPRN_HID4);
237 SYSFS_PMCSETUP(hid5, SPRN_HID5);
238 SYSFS_PMCSETUP(ima0, SPRN_PA6T_IMA0);
239 SYSFS_PMCSETUP(ima1, SPRN_PA6T_IMA1);
240 SYSFS_PMCSETUP(ima2, SPRN_PA6T_IMA2);
241 SYSFS_PMCSETUP(ima3, SPRN_PA6T_IMA3);
242 SYSFS_PMCSETUP(ima4, SPRN_PA6T_IMA4);
243 SYSFS_PMCSETUP(ima5, SPRN_PA6T_IMA5);
244 SYSFS_PMCSETUP(ima6, SPRN_PA6T_IMA6);
245 SYSFS_PMCSETUP(ima7, SPRN_PA6T_IMA7);
246 SYSFS_PMCSETUP(ima8, SPRN_PA6T_IMA8);
247 SYSFS_PMCSETUP(ima9, SPRN_PA6T_IMA9);
248 SYSFS_PMCSETUP(imaat, SPRN_PA6T_IMAAT);
249 SYSFS_PMCSETUP(btcr, SPRN_PA6T_BTCR);
250 SYSFS_PMCSETUP(pccr, SPRN_PA6T_PCCR);
251 SYSFS_PMCSETUP(rpccr, SPRN_PA6T_RPCCR);
252 SYSFS_PMCSETUP(der, SPRN_PA6T_DER);
253 SYSFS_PMCSETUP(mer, SPRN_PA6T_MER);
254 SYSFS_PMCSETUP(ber, SPRN_PA6T_BER);
255 SYSFS_PMCSETUP(ier, SPRN_PA6T_IER);
256 SYSFS_PMCSETUP(sier, SPRN_PA6T_SIER);
257 SYSFS_PMCSETUP(siar, SPRN_PA6T_SIAR);
258 SYSFS_PMCSETUP(tsr0, SPRN_PA6T_TSR0);
259 SYSFS_PMCSETUP(tsr1, SPRN_PA6T_TSR1);
260 SYSFS_PMCSETUP(tsr2, SPRN_PA6T_TSR2);
261 SYSFS_PMCSETUP(tsr3, SPRN_PA6T_TSR3);
262 #endif /* CONFIG_DEBUG_KERNEL */
263 #endif /* HAS_PPC_PMC_PA6T */
264
265 #ifdef HAS_PPC_PMC_IBM
266 static struct sysdev_attribute ibm_common_attrs[] = {
267 _SYSDEV_ATTR(mmcr0, 0600, show_mmcr0, store_mmcr0),
268 _SYSDEV_ATTR(mmcr1, 0600, show_mmcr1, store_mmcr1),
269 };
270 #endif /* HAS_PPC_PMC_G4 */
271
272 #ifdef HAS_PPC_PMC_G4
273 static struct sysdev_attribute g4_common_attrs[] = {
274 _SYSDEV_ATTR(mmcr0, 0600, show_mmcr0, store_mmcr0),
275 _SYSDEV_ATTR(mmcr1, 0600, show_mmcr1, store_mmcr1),
276 _SYSDEV_ATTR(mmcr2, 0600, show_mmcr2, store_mmcr2),
277 };
278 #endif /* HAS_PPC_PMC_G4 */
279
280 static struct sysdev_attribute classic_pmc_attrs[] = {
281 _SYSDEV_ATTR(pmc1, 0600, show_pmc1, store_pmc1),
282 _SYSDEV_ATTR(pmc2, 0600, show_pmc2, store_pmc2),
283 _SYSDEV_ATTR(pmc3, 0600, show_pmc3, store_pmc3),
284 _SYSDEV_ATTR(pmc4, 0600, show_pmc4, store_pmc4),
285 _SYSDEV_ATTR(pmc5, 0600, show_pmc5, store_pmc5),
286 _SYSDEV_ATTR(pmc6, 0600, show_pmc6, store_pmc6),
287 #ifdef CONFIG_PPC64
288 _SYSDEV_ATTR(pmc7, 0600, show_pmc7, store_pmc7),
289 _SYSDEV_ATTR(pmc8, 0600, show_pmc8, store_pmc8),
290 #endif
291 };
292
293 #ifdef HAS_PPC_PMC_PA6T
294 static struct sysdev_attribute pa6t_attrs[] = {
295 _SYSDEV_ATTR(mmcr0, 0600, show_mmcr0, store_mmcr0),
296 _SYSDEV_ATTR(mmcr1, 0600, show_mmcr1, store_mmcr1),
297 _SYSDEV_ATTR(pmc0, 0600, show_pa6t_pmc0, store_pa6t_pmc0),
298 _SYSDEV_ATTR(pmc1, 0600, show_pa6t_pmc1, store_pa6t_pmc1),
299 _SYSDEV_ATTR(pmc2, 0600, show_pa6t_pmc2, store_pa6t_pmc2),
300 _SYSDEV_ATTR(pmc3, 0600, show_pa6t_pmc3, store_pa6t_pmc3),
301 _SYSDEV_ATTR(pmc4, 0600, show_pa6t_pmc4, store_pa6t_pmc4),
302 _SYSDEV_ATTR(pmc5, 0600, show_pa6t_pmc5, store_pa6t_pmc5),
303 #ifdef CONFIG_DEBUG_KERNEL
304 _SYSDEV_ATTR(hid0, 0600, show_hid0, store_hid0),
305 _SYSDEV_ATTR(hid1, 0600, show_hid1, store_hid1),
306 _SYSDEV_ATTR(hid4, 0600, show_hid4, store_hid4),
307 _SYSDEV_ATTR(hid5, 0600, show_hid5, store_hid5),
308 _SYSDEV_ATTR(ima0, 0600, show_ima0, store_ima0),
309 _SYSDEV_ATTR(ima1, 0600, show_ima1, store_ima1),
310 _SYSDEV_ATTR(ima2, 0600, show_ima2, store_ima2),
311 _SYSDEV_ATTR(ima3, 0600, show_ima3, store_ima3),
312 _SYSDEV_ATTR(ima4, 0600, show_ima4, store_ima4),
313 _SYSDEV_ATTR(ima5, 0600, show_ima5, store_ima5),
314 _SYSDEV_ATTR(ima6, 0600, show_ima6, store_ima6),
315 _SYSDEV_ATTR(ima7, 0600, show_ima7, store_ima7),
316 _SYSDEV_ATTR(ima8, 0600, show_ima8, store_ima8),
317 _SYSDEV_ATTR(ima9, 0600, show_ima9, store_ima9),
318 _SYSDEV_ATTR(imaat, 0600, show_imaat, store_imaat),
319 _SYSDEV_ATTR(btcr, 0600, show_btcr, store_btcr),
320 _SYSDEV_ATTR(pccr, 0600, show_pccr, store_pccr),
321 _SYSDEV_ATTR(rpccr, 0600, show_rpccr, store_rpccr),
322 _SYSDEV_ATTR(der, 0600, show_der, store_der),
323 _SYSDEV_ATTR(mer, 0600, show_mer, store_mer),
324 _SYSDEV_ATTR(ber, 0600, show_ber, store_ber),
325 _SYSDEV_ATTR(ier, 0600, show_ier, store_ier),
326 _SYSDEV_ATTR(sier, 0600, show_sier, store_sier),
327 _SYSDEV_ATTR(siar, 0600, show_siar, store_siar),
328 _SYSDEV_ATTR(tsr0, 0600, show_tsr0, store_tsr0),
329 _SYSDEV_ATTR(tsr1, 0600, show_tsr1, store_tsr1),
330 _SYSDEV_ATTR(tsr2, 0600, show_tsr2, store_tsr2),
331 _SYSDEV_ATTR(tsr3, 0600, show_tsr3, store_tsr3),
332 #endif /* CONFIG_DEBUG_KERNEL */
333 };
334 #endif /* HAS_PPC_PMC_PA6T */
335 #endif /* HAS_PPC_PMC_CLASSIC */
336
337 static void __cpuinit register_cpu_online(unsigned int cpu)
338 {
339 struct cpu *c = &per_cpu(cpu_devices, cpu);
340 struct sys_device *s = &c->sysdev;
341 struct sysdev_attribute *attrs, *pmc_attrs;
342 int i, nattrs;
343
344 #ifdef CONFIG_PPC64
345 if (!firmware_has_feature(FW_FEATURE_ISERIES) &&
346 cpu_has_feature(CPU_FTR_SMT))
347 sysdev_create_file(s, &attr_smt_snooze_delay);
348 #endif
349
350 /* PMC stuff */
351 switch (cur_cpu_spec->pmc_type) {
352 #ifdef HAS_PPC_PMC_IBM
353 case PPC_PMC_IBM:
354 attrs = ibm_common_attrs;
355 nattrs = sizeof(ibm_common_attrs) / sizeof(struct sysdev_attribute);
356 pmc_attrs = classic_pmc_attrs;
357 break;
358 #endif /* HAS_PPC_PMC_IBM */
359 #ifdef HAS_PPC_PMC_G4
360 case PPC_PMC_G4:
361 attrs = g4_common_attrs;
362 nattrs = sizeof(g4_common_attrs) / sizeof(struct sysdev_attribute);
363 pmc_attrs = classic_pmc_attrs;
364 break;
365 #endif /* HAS_PPC_PMC_G4 */
366 #ifdef HAS_PPC_PMC_PA6T
367 case PPC_PMC_PA6T:
368 /* PA Semi starts counting at PMC0 */
369 attrs = pa6t_attrs;
370 nattrs = sizeof(pa6t_attrs) / sizeof(struct sysdev_attribute);
371 pmc_attrs = NULL;
372 break;
373 #endif /* HAS_PPC_PMC_PA6T */
374 default:
375 attrs = NULL;
376 nattrs = 0;
377 pmc_attrs = NULL;
378 }
379
380 for (i = 0; i < nattrs; i++)
381 sysdev_create_file(s, &attrs[i]);
382
383 if (pmc_attrs)
384 for (i = 0; i < cur_cpu_spec->num_pmcs; i++)
385 sysdev_create_file(s, &pmc_attrs[i]);
386
387 #ifdef CONFIG_PPC64
388 if (cpu_has_feature(CPU_FTR_MMCRA))
389 sysdev_create_file(s, &attr_mmcra);
390
391 if (cpu_has_feature(CPU_FTR_PURR))
392 sysdev_create_file(s, &attr_purr);
393
394 if (cpu_has_feature(CPU_FTR_SPURR))
395 sysdev_create_file(s, &attr_spurr);
396
397 if (cpu_has_feature(CPU_FTR_DSCR))
398 sysdev_create_file(s, &attr_dscr);
399
400 if (cpu_has_feature(CPU_FTR_PPCAS_ARCH_V2))
401 sysdev_create_file(s, &attr_pir);
402 #endif /* CONFIG_PPC64 */
403
404 cacheinfo_cpu_online(cpu);
405 }
406
407 #ifdef CONFIG_HOTPLUG_CPU
408 static void unregister_cpu_online(unsigned int cpu)
409 {
410 struct cpu *c = &per_cpu(cpu_devices, cpu);
411 struct sys_device *s = &c->sysdev;
412 struct sysdev_attribute *attrs, *pmc_attrs;
413 int i, nattrs;
414
415 BUG_ON(!c->hotpluggable);
416
417 #ifdef CONFIG_PPC64
418 if (!firmware_has_feature(FW_FEATURE_ISERIES) &&
419 cpu_has_feature(CPU_FTR_SMT))
420 sysdev_remove_file(s, &attr_smt_snooze_delay);
421 #endif
422
423 /* PMC stuff */
424 switch (cur_cpu_spec->pmc_type) {
425 #ifdef HAS_PPC_PMC_IBM
426 case PPC_PMC_IBM:
427 attrs = ibm_common_attrs;
428 nattrs = sizeof(ibm_common_attrs) / sizeof(struct sysdev_attribute);
429 pmc_attrs = classic_pmc_attrs;
430 break;
431 #endif /* HAS_PPC_PMC_IBM */
432 #ifdef HAS_PPC_PMC_G4
433 case PPC_PMC_G4:
434 attrs = g4_common_attrs;
435 nattrs = sizeof(g4_common_attrs) / sizeof(struct sysdev_attribute);
436 pmc_attrs = classic_pmc_attrs;
437 break;
438 #endif /* HAS_PPC_PMC_G4 */
439 #ifdef HAS_PPC_PMC_PA6T
440 case PPC_PMC_PA6T:
441 /* PA Semi starts counting at PMC0 */
442 attrs = pa6t_attrs;
443 nattrs = sizeof(pa6t_attrs) / sizeof(struct sysdev_attribute);
444 pmc_attrs = NULL;
445 break;
446 #endif /* HAS_PPC_PMC_PA6T */
447 default:
448 attrs = NULL;
449 nattrs = 0;
450 pmc_attrs = NULL;
451 }
452
453 for (i = 0; i < nattrs; i++)
454 sysdev_remove_file(s, &attrs[i]);
455
456 if (pmc_attrs)
457 for (i = 0; i < cur_cpu_spec->num_pmcs; i++)
458 sysdev_remove_file(s, &pmc_attrs[i]);
459
460 #ifdef CONFIG_PPC64
461 if (cpu_has_feature(CPU_FTR_MMCRA))
462 sysdev_remove_file(s, &attr_mmcra);
463
464 if (cpu_has_feature(CPU_FTR_PURR))
465 sysdev_remove_file(s, &attr_purr);
466
467 if (cpu_has_feature(CPU_FTR_SPURR))
468 sysdev_remove_file(s, &attr_spurr);
469
470 if (cpu_has_feature(CPU_FTR_DSCR))
471 sysdev_remove_file(s, &attr_dscr);
472
473 if (cpu_has_feature(CPU_FTR_PPCAS_ARCH_V2))
474 sysdev_remove_file(s, &attr_pir);
475 #endif /* CONFIG_PPC64 */
476
477 cacheinfo_cpu_offline(cpu);
478 }
479
480 #ifdef CONFIG_ARCH_CPU_PROBE_RELEASE
481 ssize_t arch_cpu_probe(const char *buf, size_t count)
482 {
483 if (ppc_md.cpu_probe)
484 return ppc_md.cpu_probe(buf, count);
485
486 return -EINVAL;
487 }
488
489 ssize_t arch_cpu_release(const char *buf, size_t count)
490 {
491 if (ppc_md.cpu_release)
492 return ppc_md.cpu_release(buf, count);
493
494 return -EINVAL;
495 }
496 #endif /* CONFIG_ARCH_CPU_PROBE_RELEASE */
497
498 #endif /* CONFIG_HOTPLUG_CPU */
499
500 static int __cpuinit sysfs_cpu_notify(struct notifier_block *self,
501 unsigned long action, void *hcpu)
502 {
503 unsigned int cpu = (unsigned int)(long)hcpu;
504
505 switch (action) {
506 case CPU_ONLINE:
507 case CPU_ONLINE_FROZEN:
508 register_cpu_online(cpu);
509 break;
510 #ifdef CONFIG_HOTPLUG_CPU
511 case CPU_DEAD:
512 case CPU_DEAD_FROZEN:
513 unregister_cpu_online(cpu);
514 break;
515 #endif
516 }
517 return NOTIFY_OK;
518 }
519
520 static struct notifier_block __cpuinitdata sysfs_cpu_nb = {
521 .notifier_call = sysfs_cpu_notify,
522 };
523
524 static DEFINE_MUTEX(cpu_mutex);
525
526 int cpu_add_sysdev_attr(struct sysdev_attribute *attr)
527 {
528 int cpu;
529
530 mutex_lock(&cpu_mutex);
531
532 for_each_possible_cpu(cpu) {
533 sysdev_create_file(get_cpu_sysdev(cpu), attr);
534 }
535
536 mutex_unlock(&cpu_mutex);
537 return 0;
538 }
539 EXPORT_SYMBOL_GPL(cpu_add_sysdev_attr);
540
541 int cpu_add_sysdev_attr_group(struct attribute_group *attrs)
542 {
543 int cpu;
544 struct sys_device *sysdev;
545 int ret;
546
547 mutex_lock(&cpu_mutex);
548
549 for_each_possible_cpu(cpu) {
550 sysdev = get_cpu_sysdev(cpu);
551 ret = sysfs_create_group(&sysdev->kobj, attrs);
552 WARN_ON(ret != 0);
553 }
554
555 mutex_unlock(&cpu_mutex);
556 return 0;
557 }
558 EXPORT_SYMBOL_GPL(cpu_add_sysdev_attr_group);
559
560
561 void cpu_remove_sysdev_attr(struct sysdev_attribute *attr)
562 {
563 int cpu;
564
565 mutex_lock(&cpu_mutex);
566
567 for_each_possible_cpu(cpu) {
568 sysdev_remove_file(get_cpu_sysdev(cpu), attr);
569 }
570
571 mutex_unlock(&cpu_mutex);
572 }
573 EXPORT_SYMBOL_GPL(cpu_remove_sysdev_attr);
574
575 void cpu_remove_sysdev_attr_group(struct attribute_group *attrs)
576 {
577 int cpu;
578 struct sys_device *sysdev;
579
580 mutex_lock(&cpu_mutex);
581
582 for_each_possible_cpu(cpu) {
583 sysdev = get_cpu_sysdev(cpu);
584 sysfs_remove_group(&sysdev->kobj, attrs);
585 }
586
587 mutex_unlock(&cpu_mutex);
588 }
589 EXPORT_SYMBOL_GPL(cpu_remove_sysdev_attr_group);
590
591
592 /* NUMA stuff */
593
594 #ifdef CONFIG_NUMA
595 static void register_nodes(void)
596 {
597 int i;
598
599 for (i = 0; i < MAX_NUMNODES; i++)
600 register_one_node(i);
601 }
602
603 int sysfs_add_device_to_node(struct sys_device *dev, int nid)
604 {
605 struct node *node = &node_devices[nid];
606 return sysfs_create_link(&node->sysdev.kobj, &dev->kobj,
607 kobject_name(&dev->kobj));
608 }
609 EXPORT_SYMBOL_GPL(sysfs_add_device_to_node);
610
611 void sysfs_remove_device_from_node(struct sys_device *dev, int nid)
612 {
613 struct node *node = &node_devices[nid];
614 sysfs_remove_link(&node->sysdev.kobj, kobject_name(&dev->kobj));
615 }
616 EXPORT_SYMBOL_GPL(sysfs_remove_device_from_node);
617
618 #else
619 static void register_nodes(void)
620 {
621 return;
622 }
623
624 #endif
625
626 /* Only valid if CPU is present. */
627 static ssize_t show_physical_id(struct sys_device *dev,
628 struct sysdev_attribute *attr, char *buf)
629 {
630 struct cpu *cpu = container_of(dev, struct cpu, sysdev);
631
632 return sprintf(buf, "%d\n", get_hard_smp_processor_id(cpu->sysdev.id));
633 }
634 static SYSDEV_ATTR(physical_id, 0444, show_physical_id, NULL);
635
636 static int __init topology_init(void)
637 {
638 int cpu;
639
640 register_nodes();
641 register_cpu_notifier(&sysfs_cpu_nb);
642
643 for_each_possible_cpu(cpu) {
644 struct cpu *c = &per_cpu(cpu_devices, cpu);
645
646 /*
647 * For now, we just see if the system supports making
648 * the RTAS calls for CPU hotplug. But, there may be a
649 * more comprehensive way to do this for an individual
650 * CPU. For instance, the boot cpu might never be valid
651 * for hotplugging.
652 */
653 if (ppc_md.cpu_die)
654 c->hotpluggable = 1;
655
656 if (cpu_online(cpu) || c->hotpluggable) {
657 register_cpu(c, cpu);
658
659 sysdev_create_file(&c->sysdev, &attr_physical_id);
660 }
661
662 if (cpu_online(cpu))
663 register_cpu_online(cpu);
664 }
665 #ifdef CONFIG_PPC64
666 sysfs_create_dscr_default();
667 #endif /* CONFIG_PPC64 */
668
669 return 0;
670 }
671 subsys_initcall(topology_init);