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