Pileus Git - ~andy/linux/blob - arch/powerpc/kernel/sysfs.c

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