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