1 #include <linux/device.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
store_smt_snooze_delay(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)41 static ssize_t store_smt_snooze_delay(struct device *dev,
42 struct device_attribute *attr,
43 const char *buf,
44 size_t count)
45 {
46 struct cpu *cpu = container_of(dev, struct cpu, dev);
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->dev.id) = snooze;
55 update_smt_snooze_delay(snooze);
56
57 return count;
58 }
59
show_smt_snooze_delay(struct device * dev,struct device_attribute * attr,char * buf)60 static ssize_t show_smt_snooze_delay(struct device *dev,
61 struct device_attribute *attr,
62 char *buf)
63 {
64 struct cpu *cpu = container_of(dev, struct cpu, dev);
65
66 return sprintf(buf, "%ld\n", per_cpu(smt_snooze_delay, cpu->dev.id));
67 }
68
69 static DEVICE_ATTR(smt_snooze_delay, 0644, show_smt_snooze_delay,
70 store_smt_snooze_delay);
71
setup_smt_snooze_delay(char * str)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
ppc_enable_pmcs(void)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 device *dev, \
123 struct device_attribute *attr, \
124 char *buf) \
125 { \
126 struct cpu *cpu = container_of(dev, struct cpu, dev); \
127 unsigned long val; \
128 smp_call_function_single(cpu->dev.id, read_##NAME, &val, 1); \
129 return sprintf(buf, "%lx\n", val); \
130 } \
131 static ssize_t __used \
132 store_##NAME(struct device *dev, struct device_attribute *attr, \
133 const char *buf, size_t count) \
134 { \
135 struct cpu *cpu = container_of(dev, struct cpu, dev); \
136 unsigned long val; \
137 int ret = sscanf(buf, "%lx", &val); \
138 if (ret != 1) \
139 return -EINVAL; \
140 smp_call_function_single(cpu->dev.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 DEVICE_ATTR(mmcra, 0600, show_mmcra, store_mmcra);
185 static DEVICE_ATTR(spurr, 0600, show_spurr, NULL);
186 static DEVICE_ATTR(dscr, 0600, show_dscr, store_dscr);
187 static DEVICE_ATTR(purr, 0600, show_purr, store_purr);
188 static DEVICE_ATTR(pir, 0400, show_pir, NULL);
189
190 unsigned long dscr_default = 0;
191 EXPORT_SYMBOL(dscr_default);
192
show_dscr_default(struct device * dev,struct device_attribute * attr,char * buf)193 static ssize_t show_dscr_default(struct device *dev,
194 struct device_attribute *attr, char *buf)
195 {
196 return sprintf(buf, "%lx\n", dscr_default);
197 }
198
store_dscr_default(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)199 static ssize_t __used store_dscr_default(struct device *dev,
200 struct device_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 DEVICE_ATTR(dscr_default, 0600,
215 show_dscr_default, store_dscr_default);
216
sysfs_create_dscr_default(void)217 static void sysfs_create_dscr_default(void)
218 {
219 int err = 0;
220 if (cpu_has_feature(CPU_FTR_DSCR))
221 err = device_create_file(cpu_subsys.dev_root, &dev_attr_dscr_default);
222 }
223 #endif /* CONFIG_PPC64 */
224
225 #ifdef HAS_PPC_PMC_PA6T
226 SYSFS_PMCSETUP(pa6t_pmc0, SPRN_PA6T_PMC0);
227 SYSFS_PMCSETUP(pa6t_pmc1, SPRN_PA6T_PMC1);
228 SYSFS_PMCSETUP(pa6t_pmc2, SPRN_PA6T_PMC2);
229 SYSFS_PMCSETUP(pa6t_pmc3, SPRN_PA6T_PMC3);
230 SYSFS_PMCSETUP(pa6t_pmc4, SPRN_PA6T_PMC4);
231 SYSFS_PMCSETUP(pa6t_pmc5, SPRN_PA6T_PMC5);
232 #ifdef CONFIG_DEBUG_KERNEL
233 SYSFS_PMCSETUP(hid0, SPRN_HID0);
234 SYSFS_PMCSETUP(hid1, SPRN_HID1);
235 SYSFS_PMCSETUP(hid4, SPRN_HID4);
236 SYSFS_PMCSETUP(hid5, SPRN_HID5);
237 SYSFS_PMCSETUP(ima0, SPRN_PA6T_IMA0);
238 SYSFS_PMCSETUP(ima1, SPRN_PA6T_IMA1);
239 SYSFS_PMCSETUP(ima2, SPRN_PA6T_IMA2);
240 SYSFS_PMCSETUP(ima3, SPRN_PA6T_IMA3);
241 SYSFS_PMCSETUP(ima4, SPRN_PA6T_IMA4);
242 SYSFS_PMCSETUP(ima5, SPRN_PA6T_IMA5);
243 SYSFS_PMCSETUP(ima6, SPRN_PA6T_IMA6);
244 SYSFS_PMCSETUP(ima7, SPRN_PA6T_IMA7);
245 SYSFS_PMCSETUP(ima8, SPRN_PA6T_IMA8);
246 SYSFS_PMCSETUP(ima9, SPRN_PA6T_IMA9);
247 SYSFS_PMCSETUP(imaat, SPRN_PA6T_IMAAT);
248 SYSFS_PMCSETUP(btcr, SPRN_PA6T_BTCR);
249 SYSFS_PMCSETUP(pccr, SPRN_PA6T_PCCR);
250 SYSFS_PMCSETUP(rpccr, SPRN_PA6T_RPCCR);
251 SYSFS_PMCSETUP(der, SPRN_PA6T_DER);
252 SYSFS_PMCSETUP(mer, SPRN_PA6T_MER);
253 SYSFS_PMCSETUP(ber, SPRN_PA6T_BER);
254 SYSFS_PMCSETUP(ier, SPRN_PA6T_IER);
255 SYSFS_PMCSETUP(sier, SPRN_PA6T_SIER);
256 SYSFS_PMCSETUP(siar, SPRN_PA6T_SIAR);
257 SYSFS_PMCSETUP(tsr0, SPRN_PA6T_TSR0);
258 SYSFS_PMCSETUP(tsr1, SPRN_PA6T_TSR1);
259 SYSFS_PMCSETUP(tsr2, SPRN_PA6T_TSR2);
260 SYSFS_PMCSETUP(tsr3, SPRN_PA6T_TSR3);
261 #endif /* CONFIG_DEBUG_KERNEL */
262 #endif /* HAS_PPC_PMC_PA6T */
263
264 #ifdef HAS_PPC_PMC_IBM
265 static struct device_attribute ibm_common_attrs[] = {
266 __ATTR(mmcr0, 0600, show_mmcr0, store_mmcr0),
267 __ATTR(mmcr1, 0600, show_mmcr1, store_mmcr1),
268 };
269 #endif /* HAS_PPC_PMC_G4 */
270
271 #ifdef HAS_PPC_PMC_G4
272 static struct device_attribute g4_common_attrs[] = {
273 __ATTR(mmcr0, 0600, show_mmcr0, store_mmcr0),
274 __ATTR(mmcr1, 0600, show_mmcr1, store_mmcr1),
275 __ATTR(mmcr2, 0600, show_mmcr2, store_mmcr2),
276 };
277 #endif /* HAS_PPC_PMC_G4 */
278
279 static struct device_attribute classic_pmc_attrs[] = {
280 __ATTR(pmc1, 0600, show_pmc1, store_pmc1),
281 __ATTR(pmc2, 0600, show_pmc2, store_pmc2),
282 __ATTR(pmc3, 0600, show_pmc3, store_pmc3),
283 __ATTR(pmc4, 0600, show_pmc4, store_pmc4),
284 __ATTR(pmc5, 0600, show_pmc5, store_pmc5),
285 __ATTR(pmc6, 0600, show_pmc6, store_pmc6),
286 #ifdef CONFIG_PPC64
287 __ATTR(pmc7, 0600, show_pmc7, store_pmc7),
288 __ATTR(pmc8, 0600, show_pmc8, store_pmc8),
289 #endif
290 };
291
292 #ifdef HAS_PPC_PMC_PA6T
293 static struct device_attribute pa6t_attrs[] = {
294 __ATTR(mmcr0, 0600, show_mmcr0, store_mmcr0),
295 __ATTR(mmcr1, 0600, show_mmcr1, store_mmcr1),
296 __ATTR(pmc0, 0600, show_pa6t_pmc0, store_pa6t_pmc0),
297 __ATTR(pmc1, 0600, show_pa6t_pmc1, store_pa6t_pmc1),
298 __ATTR(pmc2, 0600, show_pa6t_pmc2, store_pa6t_pmc2),
299 __ATTR(pmc3, 0600, show_pa6t_pmc3, store_pa6t_pmc3),
300 __ATTR(pmc4, 0600, show_pa6t_pmc4, store_pa6t_pmc4),
301 __ATTR(pmc5, 0600, show_pa6t_pmc5, store_pa6t_pmc5),
302 #ifdef CONFIG_DEBUG_KERNEL
303 __ATTR(hid0, 0600, show_hid0, store_hid0),
304 __ATTR(hid1, 0600, show_hid1, store_hid1),
305 __ATTR(hid4, 0600, show_hid4, store_hid4),
306 __ATTR(hid5, 0600, show_hid5, store_hid5),
307 __ATTR(ima0, 0600, show_ima0, store_ima0),
308 __ATTR(ima1, 0600, show_ima1, store_ima1),
309 __ATTR(ima2, 0600, show_ima2, store_ima2),
310 __ATTR(ima3, 0600, show_ima3, store_ima3),
311 __ATTR(ima4, 0600, show_ima4, store_ima4),
312 __ATTR(ima5, 0600, show_ima5, store_ima5),
313 __ATTR(ima6, 0600, show_ima6, store_ima6),
314 __ATTR(ima7, 0600, show_ima7, store_ima7),
315 __ATTR(ima8, 0600, show_ima8, store_ima8),
316 __ATTR(ima9, 0600, show_ima9, store_ima9),
317 __ATTR(imaat, 0600, show_imaat, store_imaat),
318 __ATTR(btcr, 0600, show_btcr, store_btcr),
319 __ATTR(pccr, 0600, show_pccr, store_pccr),
320 __ATTR(rpccr, 0600, show_rpccr, store_rpccr),
321 __ATTR(der, 0600, show_der, store_der),
322 __ATTR(mer, 0600, show_mer, store_mer),
323 __ATTR(ber, 0600, show_ber, store_ber),
324 __ATTR(ier, 0600, show_ier, store_ier),
325 __ATTR(sier, 0600, show_sier, store_sier),
326 __ATTR(siar, 0600, show_siar, store_siar),
327 __ATTR(tsr0, 0600, show_tsr0, store_tsr0),
328 __ATTR(tsr1, 0600, show_tsr1, store_tsr1),
329 __ATTR(tsr2, 0600, show_tsr2, store_tsr2),
330 __ATTR(tsr3, 0600, show_tsr3, store_tsr3),
331 #endif /* CONFIG_DEBUG_KERNEL */
332 };
333 #endif /* HAS_PPC_PMC_PA6T */
334 #endif /* HAS_PPC_PMC_CLASSIC */
335
register_cpu_online(unsigned int cpu)336 static void __cpuinit register_cpu_online(unsigned int cpu)
337 {
338 struct cpu *c = &per_cpu(cpu_devices, cpu);
339 struct device *s = &c->dev;
340 struct device_attribute *attrs, *pmc_attrs;
341 int i, nattrs;
342
343 #ifdef CONFIG_PPC64
344 if (!firmware_has_feature(FW_FEATURE_ISERIES) &&
345 cpu_has_feature(CPU_FTR_SMT))
346 device_create_file(s, &dev_attr_smt_snooze_delay);
347 #endif
348
349 /* PMC stuff */
350 switch (cur_cpu_spec->pmc_type) {
351 #ifdef HAS_PPC_PMC_IBM
352 case PPC_PMC_IBM:
353 attrs = ibm_common_attrs;
354 nattrs = sizeof(ibm_common_attrs) / sizeof(struct device_attribute);
355 pmc_attrs = classic_pmc_attrs;
356 break;
357 #endif /* HAS_PPC_PMC_IBM */
358 #ifdef HAS_PPC_PMC_G4
359 case PPC_PMC_G4:
360 attrs = g4_common_attrs;
361 nattrs = sizeof(g4_common_attrs) / sizeof(struct device_attribute);
362 pmc_attrs = classic_pmc_attrs;
363 break;
364 #endif /* HAS_PPC_PMC_G4 */
365 #ifdef HAS_PPC_PMC_PA6T
366 case PPC_PMC_PA6T:
367 /* PA Semi starts counting at PMC0 */
368 attrs = pa6t_attrs;
369 nattrs = sizeof(pa6t_attrs) / sizeof(struct device_attribute);
370 pmc_attrs = NULL;
371 break;
372 #endif /* HAS_PPC_PMC_PA6T */
373 default:
374 attrs = NULL;
375 nattrs = 0;
376 pmc_attrs = NULL;
377 }
378
379 for (i = 0; i < nattrs; i++)
380 device_create_file(s, &attrs[i]);
381
382 if (pmc_attrs)
383 for (i = 0; i < cur_cpu_spec->num_pmcs; i++)
384 device_create_file(s, &pmc_attrs[i]);
385
386 #ifdef CONFIG_PPC64
387 if (cpu_has_feature(CPU_FTR_MMCRA))
388 device_create_file(s, &dev_attr_mmcra);
389
390 if (cpu_has_feature(CPU_FTR_PURR))
391 device_create_file(s, &dev_attr_purr);
392
393 if (cpu_has_feature(CPU_FTR_SPURR))
394 device_create_file(s, &dev_attr_spurr);
395
396 if (cpu_has_feature(CPU_FTR_DSCR))
397 device_create_file(s, &dev_attr_dscr);
398
399 if (cpu_has_feature(CPU_FTR_PPCAS_ARCH_V2))
400 device_create_file(s, &dev_attr_pir);
401 #endif /* CONFIG_PPC64 */
402
403 cacheinfo_cpu_online(cpu);
404 }
405
406 #ifdef CONFIG_HOTPLUG_CPU
unregister_cpu_online(unsigned int cpu)407 static void unregister_cpu_online(unsigned int cpu)
408 {
409 struct cpu *c = &per_cpu(cpu_devices, cpu);
410 struct device *s = &c->dev;
411 struct device_attribute *attrs, *pmc_attrs;
412 int i, nattrs;
413
414 BUG_ON(!c->hotpluggable);
415
416 #ifdef CONFIG_PPC64
417 if (!firmware_has_feature(FW_FEATURE_ISERIES) &&
418 cpu_has_feature(CPU_FTR_SMT))
419 device_remove_file(s, &dev_attr_smt_snooze_delay);
420 #endif
421
422 /* PMC stuff */
423 switch (cur_cpu_spec->pmc_type) {
424 #ifdef HAS_PPC_PMC_IBM
425 case PPC_PMC_IBM:
426 attrs = ibm_common_attrs;
427 nattrs = sizeof(ibm_common_attrs) / sizeof(struct device_attribute);
428 pmc_attrs = classic_pmc_attrs;
429 break;
430 #endif /* HAS_PPC_PMC_IBM */
431 #ifdef HAS_PPC_PMC_G4
432 case PPC_PMC_G4:
433 attrs = g4_common_attrs;
434 nattrs = sizeof(g4_common_attrs) / sizeof(struct device_attribute);
435 pmc_attrs = classic_pmc_attrs;
436 break;
437 #endif /* HAS_PPC_PMC_G4 */
438 #ifdef HAS_PPC_PMC_PA6T
439 case PPC_PMC_PA6T:
440 /* PA Semi starts counting at PMC0 */
441 attrs = pa6t_attrs;
442 nattrs = sizeof(pa6t_attrs) / sizeof(struct device_attribute);
443 pmc_attrs = NULL;
444 break;
445 #endif /* HAS_PPC_PMC_PA6T */
446 default:
447 attrs = NULL;
448 nattrs = 0;
449 pmc_attrs = NULL;
450 }
451
452 for (i = 0; i < nattrs; i++)
453 device_remove_file(s, &attrs[i]);
454
455 if (pmc_attrs)
456 for (i = 0; i < cur_cpu_spec->num_pmcs; i++)
457 device_remove_file(s, &pmc_attrs[i]);
458
459 #ifdef CONFIG_PPC64
460 if (cpu_has_feature(CPU_FTR_MMCRA))
461 device_remove_file(s, &dev_attr_mmcra);
462
463 if (cpu_has_feature(CPU_FTR_PURR))
464 device_remove_file(s, &dev_attr_purr);
465
466 if (cpu_has_feature(CPU_FTR_SPURR))
467 device_remove_file(s, &dev_attr_spurr);
468
469 if (cpu_has_feature(CPU_FTR_DSCR))
470 device_remove_file(s, &dev_attr_dscr);
471
472 if (cpu_has_feature(CPU_FTR_PPCAS_ARCH_V2))
473 device_remove_file(s, &dev_attr_pir);
474 #endif /* CONFIG_PPC64 */
475
476 cacheinfo_cpu_offline(cpu);
477 }
478
479 #ifdef CONFIG_ARCH_CPU_PROBE_RELEASE
arch_cpu_probe(const char * buf,size_t count)480 ssize_t arch_cpu_probe(const char *buf, size_t count)
481 {
482 if (ppc_md.cpu_probe)
483 return ppc_md.cpu_probe(buf, count);
484
485 return -EINVAL;
486 }
487
arch_cpu_release(const char * buf,size_t count)488 ssize_t arch_cpu_release(const char *buf, size_t count)
489 {
490 if (ppc_md.cpu_release)
491 return ppc_md.cpu_release(buf, count);
492
493 return -EINVAL;
494 }
495 #endif /* CONFIG_ARCH_CPU_PROBE_RELEASE */
496
497 #endif /* CONFIG_HOTPLUG_CPU */
498
sysfs_cpu_notify(struct notifier_block * self,unsigned long action,void * hcpu)499 static int __cpuinit sysfs_cpu_notify(struct notifier_block *self,
500 unsigned long action, void *hcpu)
501 {
502 unsigned int cpu = (unsigned int)(long)hcpu;
503
504 switch (action) {
505 case CPU_ONLINE:
506 case CPU_ONLINE_FROZEN:
507 register_cpu_online(cpu);
508 break;
509 #ifdef CONFIG_HOTPLUG_CPU
510 case CPU_DEAD:
511 case CPU_DEAD_FROZEN:
512 unregister_cpu_online(cpu);
513 break;
514 #endif
515 }
516 return NOTIFY_OK;
517 }
518
519 static struct notifier_block __cpuinitdata sysfs_cpu_nb = {
520 .notifier_call = sysfs_cpu_notify,
521 };
522
523 static DEFINE_MUTEX(cpu_mutex);
524
cpu_add_dev_attr(struct device_attribute * attr)525 int cpu_add_dev_attr(struct device_attribute *attr)
526 {
527 int cpu;
528
529 mutex_lock(&cpu_mutex);
530
531 for_each_possible_cpu(cpu) {
532 device_create_file(get_cpu_device(cpu), attr);
533 }
534
535 mutex_unlock(&cpu_mutex);
536 return 0;
537 }
538 EXPORT_SYMBOL_GPL(cpu_add_dev_attr);
539
cpu_add_dev_attr_group(struct attribute_group * attrs)540 int cpu_add_dev_attr_group(struct attribute_group *attrs)
541 {
542 int cpu;
543 struct device *dev;
544 int ret;
545
546 mutex_lock(&cpu_mutex);
547
548 for_each_possible_cpu(cpu) {
549 dev = get_cpu_device(cpu);
550 ret = sysfs_create_group(&dev->kobj, attrs);
551 WARN_ON(ret != 0);
552 }
553
554 mutex_unlock(&cpu_mutex);
555 return 0;
556 }
557 EXPORT_SYMBOL_GPL(cpu_add_dev_attr_group);
558
559
cpu_remove_dev_attr(struct device_attribute * attr)560 void cpu_remove_dev_attr(struct device_attribute *attr)
561 {
562 int cpu;
563
564 mutex_lock(&cpu_mutex);
565
566 for_each_possible_cpu(cpu) {
567 device_remove_file(get_cpu_device(cpu), attr);
568 }
569
570 mutex_unlock(&cpu_mutex);
571 }
572 EXPORT_SYMBOL_GPL(cpu_remove_dev_attr);
573
cpu_remove_dev_attr_group(struct attribute_group * attrs)574 void cpu_remove_dev_attr_group(struct attribute_group *attrs)
575 {
576 int cpu;
577 struct device *dev;
578
579 mutex_lock(&cpu_mutex);
580
581 for_each_possible_cpu(cpu) {
582 dev = get_cpu_device(cpu);
583 sysfs_remove_group(&dev->kobj, attrs);
584 }
585
586 mutex_unlock(&cpu_mutex);
587 }
588 EXPORT_SYMBOL_GPL(cpu_remove_dev_attr_group);
589
590
591 /* NUMA stuff */
592
593 #ifdef CONFIG_NUMA
register_nodes(void)594 static void register_nodes(void)
595 {
596 int i;
597
598 for (i = 0; i < MAX_NUMNODES; i++)
599 register_one_node(i);
600 }
601
sysfs_add_device_to_node(struct device * dev,int nid)602 int sysfs_add_device_to_node(struct device *dev, int nid)
603 {
604 struct node *node = &node_devices[nid];
605 return sysfs_create_link(&node->dev.kobj, &dev->kobj,
606 kobject_name(&dev->kobj));
607 }
608 EXPORT_SYMBOL_GPL(sysfs_add_device_to_node);
609
sysfs_remove_device_from_node(struct device * dev,int nid)610 void sysfs_remove_device_from_node(struct device *dev, int nid)
611 {
612 struct node *node = &node_devices[nid];
613 sysfs_remove_link(&node->dev.kobj, kobject_name(&dev->kobj));
614 }
615 EXPORT_SYMBOL_GPL(sysfs_remove_device_from_node);
616
617 #else
register_nodes(void)618 static void register_nodes(void)
619 {
620 return;
621 }
622
623 #endif
624
625 /* Only valid if CPU is present. */
show_physical_id(struct device * dev,struct device_attribute * attr,char * buf)626 static ssize_t show_physical_id(struct device *dev,
627 struct device_attribute *attr, char *buf)
628 {
629 struct cpu *cpu = container_of(dev, struct cpu, dev);
630
631 return sprintf(buf, "%d\n", get_hard_smp_processor_id(cpu->dev.id));
632 }
633 static DEVICE_ATTR(physical_id, 0444, show_physical_id, NULL);
634
topology_init(void)635 static int __init topology_init(void)
636 {
637 int cpu;
638
639 register_nodes();
640 register_cpu_notifier(&sysfs_cpu_nb);
641
642 for_each_possible_cpu(cpu) {
643 struct cpu *c = &per_cpu(cpu_devices, cpu);
644
645 /*
646 * For now, we just see if the system supports making
647 * the RTAS calls for CPU hotplug. But, there may be a
648 * more comprehensive way to do this for an individual
649 * CPU. For instance, the boot cpu might never be valid
650 * for hotplugging.
651 */
652 if (ppc_md.cpu_die)
653 c->hotpluggable = 1;
654
655 if (cpu_online(cpu) || c->hotpluggable) {
656 register_cpu(c, cpu);
657
658 device_create_file(&c->dev, &dev_attr_physical_id);
659 }
660
661 if (cpu_online(cpu))
662 register_cpu_online(cpu);
663 }
664 #ifdef CONFIG_PPC64
665 sysfs_create_dscr_default();
666 #endif /* CONFIG_PPC64 */
667
668 return 0;
669 }
670 subsys_initcall(topology_init);
671