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