LXR linux/arch/powerpc/kernel/sysfs.c

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