1 #include <linux/sysdev.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>
18 #include <asm/machdep.h>
21 #include "cacheinfo.h"
25 #include <asm/lppaca.h>
28 static DEFINE_PER_CPU(struct cpu
, cpu_devices
);
31 * SMT snooze delay stuff, 64-bit only for now
36 /* Time in microseconds we delay before sleeping in the idle loop */
37 DEFINE_PER_CPU(unsigned long, smt_snooze_delay
) = { 100 };
39 static ssize_t
store_smt_snooze_delay(struct sys_device
*dev
,
40 struct sysdev_attribute
*attr
,
44 struct cpu
*cpu
= container_of(dev
, struct cpu
, sysdev
);
48 ret
= sscanf(buf
, "%lu", &snooze
);
52 per_cpu(smt_snooze_delay
, cpu
->sysdev
.id
) = snooze
;
57 static ssize_t
show_smt_snooze_delay(struct sys_device
*dev
,
58 struct sysdev_attribute
*attr
,
61 struct cpu
*cpu
= container_of(dev
, struct cpu
, sysdev
);
63 return sprintf(buf
, "%lu\n", per_cpu(smt_snooze_delay
, cpu
->sysdev
.id
));
66 static SYSDEV_ATTR(smt_snooze_delay
, 0644, show_smt_snooze_delay
,
67 store_smt_snooze_delay
);
69 /* Only parse OF options if the matching cmdline option was not specified */
70 static int smt_snooze_cmdline
;
72 static int __init
smt_setup(void)
74 struct device_node
*options
;
75 const unsigned int *val
;
78 if (!cpu_has_feature(CPU_FTR_SMT
))
81 options
= of_find_node_by_path("/options");
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
;
94 __initcall(smt_setup
);
96 static int __init
setup_smt_snooze_delay(char *str
)
101 if (!cpu_has_feature(CPU_FTR_SMT
))
104 smt_snooze_cmdline
= 1;
106 if (get_option(&str
, &snooze
)) {
107 for_each_possible_cpu(cpu
)
108 per_cpu(smt_snooze_delay
, cpu
) = snooze
;
113 __setup("smt-snooze-delay=", setup_smt_snooze_delay
);
115 #endif /* CONFIG_PPC64 */
118 * Enabling PMCs will slow partition context switch times so we only do
119 * it the first time we write to the PMCs.
122 static DEFINE_PER_CPU(char, pmcs_enabled
);
124 void ppc_enable_pmcs(void)
126 /* Only need to enable them once */
127 if (__get_cpu_var(pmcs_enabled
))
130 __get_cpu_var(pmcs_enabled
) = 1;
132 if (ppc_md
.enable_pmcs
)
133 ppc_md
.enable_pmcs();
135 EXPORT_SYMBOL(ppc_enable_pmcs
);
137 #if defined(CONFIG_6xx) || defined(CONFIG_PPC64)
138 /* XXX convert to rusty's on_one_cpu */
139 static unsigned long run_on_cpu(unsigned long cpu
,
140 unsigned long (*func
)(unsigned long),
143 cpumask_t old_affinity
= current
->cpus_allowed
;
146 /* should return -EINVAL to userspace */
147 if (set_cpus_allowed(current
, cpumask_of_cpu(cpu
)))
152 set_cpus_allowed(current
, old_affinity
);
158 #define SYSFS_PMCSETUP(NAME, ADDRESS) \
159 static unsigned long read_##NAME(unsigned long junk) \
161 return mfspr(ADDRESS); \
163 static unsigned long write_##NAME(unsigned long val) \
166 mtspr(ADDRESS, val); \
169 static ssize_t show_##NAME(struct sys_device *dev, \
170 struct sysdev_attribute *attr, \
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); \
177 static ssize_t __used \
178 store_##NAME(struct sys_device *dev, struct sysdev_attribute *attr, \
179 const char *buf, size_t count) \
181 struct cpu *cpu = container_of(dev, struct cpu, sysdev); \
183 int ret = sscanf(buf, "%lx", &val); \
186 run_on_cpu(cpu->sysdev.id, write_##NAME, val); \
191 /* Let's define all possible registers, we'll only hook up the ones
192 * that are implemented on the current processor
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
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
);
216 #ifdef HAS_PPC_PMC_G4
217 SYSFS_PMCSETUP(mmcr2
, SPRN_MMCR2
);
221 SYSFS_PMCSETUP(pmc7
, SPRN_PMC7
);
222 SYSFS_PMCSETUP(pmc8
, SPRN_PMC8
);
224 SYSFS_PMCSETUP(mmcra
, SPRN_MMCRA
);
225 SYSFS_PMCSETUP(purr
, SPRN_PURR
);
226 SYSFS_PMCSETUP(spurr
, SPRN_SPURR
);
227 SYSFS_PMCSETUP(dscr
, SPRN_DSCR
);
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 */
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 */
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
),
279 #endif /* HAS_PPC_PMC_G4 */
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
),
287 #endif /* HAS_PPC_PMC_G4 */
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
),
297 _SYSDEV_ATTR(pmc7
, 0600, show_pmc7
, store_pmc7
),
298 _SYSDEV_ATTR(pmc8
, 0600, show_pmc8
, store_pmc8
),
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 */
343 #endif /* HAS_PPC_PMC_PA6T */
344 #endif /* HAS_PPC_PMC_CLASSIC */
346 static void __cpuinit
register_cpu_online(unsigned int cpu
)
348 struct cpu
*c
= &per_cpu(cpu_devices
, cpu
);
349 struct sys_device
*s
= &c
->sysdev
;
350 struct sysdev_attribute
*attrs
, *pmc_attrs
;
354 if (!firmware_has_feature(FW_FEATURE_ISERIES
) &&
355 cpu_has_feature(CPU_FTR_SMT
))
356 sysdev_create_file(s
, &attr_smt_snooze_delay
);
360 switch (cur_cpu_spec
->pmc_type
) {
361 #ifdef HAS_PPC_PMC_IBM
363 attrs
= ibm_common_attrs
;
364 nattrs
= sizeof(ibm_common_attrs
) / sizeof(struct sysdev_attribute
);
365 pmc_attrs
= classic_pmc_attrs
;
367 #endif /* HAS_PPC_PMC_IBM */
368 #ifdef HAS_PPC_PMC_G4
370 attrs
= g4_common_attrs
;
371 nattrs
= sizeof(g4_common_attrs
) / sizeof(struct sysdev_attribute
);
372 pmc_attrs
= classic_pmc_attrs
;
374 #endif /* HAS_PPC_PMC_G4 */
375 #ifdef HAS_PPC_PMC_PA6T
377 /* PA Semi starts counting at PMC0 */
379 nattrs
= sizeof(pa6t_attrs
) / sizeof(struct sysdev_attribute
);
382 #endif /* HAS_PPC_PMC_PA6T */
389 for (i
= 0; i
< nattrs
; i
++)
390 sysdev_create_file(s
, &attrs
[i
]);
393 for (i
= 0; i
< cur_cpu_spec
->num_pmcs
; i
++)
394 sysdev_create_file(s
, &pmc_attrs
[i
]);
397 if (cpu_has_feature(CPU_FTR_MMCRA
))
398 sysdev_create_file(s
, &attr_mmcra
);
400 if (cpu_has_feature(CPU_FTR_PURR
))
401 sysdev_create_file(s
, &attr_purr
);
403 if (cpu_has_feature(CPU_FTR_SPURR
))
404 sysdev_create_file(s
, &attr_spurr
);
406 if (cpu_has_feature(CPU_FTR_DSCR
))
407 sysdev_create_file(s
, &attr_dscr
);
408 #endif /* CONFIG_PPC64 */
410 cacheinfo_cpu_online(cpu
);
413 #ifdef CONFIG_HOTPLUG_CPU
414 static void unregister_cpu_online(unsigned int cpu
)
416 struct cpu
*c
= &per_cpu(cpu_devices
, cpu
);
417 struct sys_device
*s
= &c
->sysdev
;
418 struct sysdev_attribute
*attrs
, *pmc_attrs
;
421 BUG_ON(!c
->hotpluggable
);
424 if (!firmware_has_feature(FW_FEATURE_ISERIES
) &&
425 cpu_has_feature(CPU_FTR_SMT
))
426 sysdev_remove_file(s
, &attr_smt_snooze_delay
);
430 switch (cur_cpu_spec
->pmc_type
) {
431 #ifdef HAS_PPC_PMC_IBM
433 attrs
= ibm_common_attrs
;
434 nattrs
= sizeof(ibm_common_attrs
) / sizeof(struct sysdev_attribute
);
435 pmc_attrs
= classic_pmc_attrs
;
437 #endif /* HAS_PPC_PMC_IBM */
438 #ifdef HAS_PPC_PMC_G4
440 attrs
= g4_common_attrs
;
441 nattrs
= sizeof(g4_common_attrs
) / sizeof(struct sysdev_attribute
);
442 pmc_attrs
= classic_pmc_attrs
;
444 #endif /* HAS_PPC_PMC_G4 */
445 #ifdef HAS_PPC_PMC_PA6T
447 /* PA Semi starts counting at PMC0 */
449 nattrs
= sizeof(pa6t_attrs
) / sizeof(struct sysdev_attribute
);
452 #endif /* HAS_PPC_PMC_PA6T */
459 for (i
= 0; i
< nattrs
; i
++)
460 sysdev_remove_file(s
, &attrs
[i
]);
463 for (i
= 0; i
< cur_cpu_spec
->num_pmcs
; i
++)
464 sysdev_remove_file(s
, &pmc_attrs
[i
]);
467 if (cpu_has_feature(CPU_FTR_MMCRA
))
468 sysdev_remove_file(s
, &attr_mmcra
);
470 if (cpu_has_feature(CPU_FTR_PURR
))
471 sysdev_remove_file(s
, &attr_purr
);
473 if (cpu_has_feature(CPU_FTR_SPURR
))
474 sysdev_remove_file(s
, &attr_spurr
);
476 if (cpu_has_feature(CPU_FTR_DSCR
))
477 sysdev_remove_file(s
, &attr_dscr
);
478 #endif /* CONFIG_PPC64 */
480 cacheinfo_cpu_offline(cpu
);
482 #endif /* CONFIG_HOTPLUG_CPU */
484 static int __cpuinit
sysfs_cpu_notify(struct notifier_block
*self
,
485 unsigned long action
, void *hcpu
)
487 unsigned int cpu
= (unsigned int)(long)hcpu
;
491 case CPU_ONLINE_FROZEN
:
492 register_cpu_online(cpu
);
494 #ifdef CONFIG_HOTPLUG_CPU
496 case CPU_DEAD_FROZEN
:
497 unregister_cpu_online(cpu
);
504 static struct notifier_block __cpuinitdata sysfs_cpu_nb
= {
505 .notifier_call
= sysfs_cpu_notify
,
508 static DEFINE_MUTEX(cpu_mutex
);
510 int cpu_add_sysdev_attr(struct sysdev_attribute
*attr
)
514 mutex_lock(&cpu_mutex
);
516 for_each_possible_cpu(cpu
) {
517 sysdev_create_file(get_cpu_sysdev(cpu
), attr
);
520 mutex_unlock(&cpu_mutex
);
523 EXPORT_SYMBOL_GPL(cpu_add_sysdev_attr
);
525 int cpu_add_sysdev_attr_group(struct attribute_group
*attrs
)
528 struct sys_device
*sysdev
;
531 mutex_lock(&cpu_mutex
);
533 for_each_possible_cpu(cpu
) {
534 sysdev
= get_cpu_sysdev(cpu
);
535 ret
= sysfs_create_group(&sysdev
->kobj
, attrs
);
539 mutex_unlock(&cpu_mutex
);
542 EXPORT_SYMBOL_GPL(cpu_add_sysdev_attr_group
);
545 void cpu_remove_sysdev_attr(struct sysdev_attribute
*attr
)
549 mutex_lock(&cpu_mutex
);
551 for_each_possible_cpu(cpu
) {
552 sysdev_remove_file(get_cpu_sysdev(cpu
), attr
);
555 mutex_unlock(&cpu_mutex
);
557 EXPORT_SYMBOL_GPL(cpu_remove_sysdev_attr
);
559 void cpu_remove_sysdev_attr_group(struct attribute_group
*attrs
)
562 struct sys_device
*sysdev
;
564 mutex_lock(&cpu_mutex
);
566 for_each_possible_cpu(cpu
) {
567 sysdev
= get_cpu_sysdev(cpu
);
568 sysfs_remove_group(&sysdev
->kobj
, attrs
);
571 mutex_unlock(&cpu_mutex
);
573 EXPORT_SYMBOL_GPL(cpu_remove_sysdev_attr_group
);
579 static void register_nodes(void)
583 for (i
= 0; i
< MAX_NUMNODES
; i
++)
584 register_one_node(i
);
587 int sysfs_add_device_to_node(struct sys_device
*dev
, int nid
)
589 struct node
*node
= &node_devices
[nid
];
590 return sysfs_create_link(&node
->sysdev
.kobj
, &dev
->kobj
,
591 kobject_name(&dev
->kobj
));
593 EXPORT_SYMBOL_GPL(sysfs_add_device_to_node
);
595 void sysfs_remove_device_from_node(struct sys_device
*dev
, int nid
)
597 struct node
*node
= &node_devices
[nid
];
598 sysfs_remove_link(&node
->sysdev
.kobj
, kobject_name(&dev
->kobj
));
600 EXPORT_SYMBOL_GPL(sysfs_remove_device_from_node
);
603 static void register_nodes(void)
610 /* Only valid if CPU is present. */
611 static ssize_t
show_physical_id(struct sys_device
*dev
,
612 struct sysdev_attribute
*attr
, char *buf
)
614 struct cpu
*cpu
= container_of(dev
, struct cpu
, sysdev
);
616 return sprintf(buf
, "%d\n", get_hard_smp_processor_id(cpu
->sysdev
.id
));
618 static SYSDEV_ATTR(physical_id
, 0444, show_physical_id
, NULL
);
620 static int __init
topology_init(void)
625 register_cpu_notifier(&sysfs_cpu_nb
);
627 for_each_possible_cpu(cpu
) {
628 struct cpu
*c
= &per_cpu(cpu_devices
, cpu
);
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
640 if (cpu_online(cpu
) || c
->hotpluggable
) {
641 register_cpu(c
, cpu
);
643 sysdev_create_file(&c
->sysdev
, &attr_physical_id
);
647 register_cpu_online(cpu
);
652 subsys_initcall(topology_init
);