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
  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(unsigned long, smt_snooze_delay) = { 100 };
  39
  40 static 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
  58 static 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
  67 static 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 */
  71 static int smt_snooze_cmdline;
  72
  73 static 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
  97 static 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
 123 static DEFINE_PER_CPU(char, pmcs_enabled);
 124
 125 void 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 }
 138 EXPORT_SYMBOL(ppc_enable_pmcs);
 139
 140 #define SYSFS_PMCSETUP(NAME, ADDRESS) \
 141 static void read_##NAME(void *val) \
 142 { \
 143         *(unsigned long *)val = mfspr(ADDRESS); \
 144 } \
 145 static void write_##NAME(void *val) \
 146 { \
 147         ppc_enable_pmcs(); \
 148         mtspr(ADDRESS, *(unsigned long *)val);  \
 149 } \
 150 static 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 } \
 159 static 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
 189 SYSFS_PMCSETUP(mmcr0, SPRN_MMCR0);
 190 SYSFS_PMCSETUP(mmcr1, SPRN_MMCR1);
 191 SYSFS_PMCSETUP(pmc1, SPRN_PMC1);
 192 SYSFS_PMCSETUP(pmc2, SPRN_PMC2);
 193 SYSFS_PMCSETUP(pmc3, SPRN_PMC3);
 194 SYSFS_PMCSETUP(pmc4, SPRN_PMC4);
 195 SYSFS_PMCSETUP(pmc5, SPRN_PMC5);
 196 SYSFS_PMCSETUP(pmc6, SPRN_PMC6);
 197
 198 #ifdef HAS_PPC_PMC_G4
 199 SYSFS_PMCSETUP(mmcr2, SPRN_MMCR2);
 200 #endif
 201
 202 #ifdef CONFIG_PPC64
 203 SYSFS_PMCSETUP(pmc7, SPRN_PMC7);
 204 SYSFS_PMCSETUP(pmc8, SPRN_PMC8);
 205
 206 SYSFS_PMCSETUP(mmcra, SPRN_MMCRA);
 207 SYSFS_PMCSETUP(purr, SPRN_PURR);
 208 SYSFS_PMCSETUP(spurr, SPRN_SPURR);
 209 SYSFS_PMCSETUP(dscr, SPRN_DSCR);
 210
 211 static SYSDEV_ATTR(mmcra, 0600, show_mmcra, store_mmcra);
 212 static SYSDEV_ATTR(spurr, 0600, show_spurr, NULL);
 213 static SYSDEV_ATTR(dscr, 0600, show_dscr, store_dscr);
 214 static SYSDEV_ATTR(purr, 0600, show_purr, store_purr);
 215 #endif /* CONFIG_PPC64 */
 216
 217 #ifdef HAS_PPC_PMC_PA6T
 218 SYSFS_PMCSETUP(pa6t_pmc0, SPRN_PA6T_PMC0);
 219 SYSFS_PMCSETUP(pa6t_pmc1, SPRN_PA6T_PMC1);
 220 SYSFS_PMCSETUP(pa6t_pmc2, SPRN_PA6T_PMC2);
 221 SYSFS_PMCSETUP(pa6t_pmc3, SPRN_PA6T_PMC3);
 222 SYSFS_PMCSETUP(pa6t_pmc4, SPRN_PA6T_PMC4);
 223 SYSFS_PMCSETUP(pa6t_pmc5, SPRN_PA6T_PMC5);
 224 #ifdef CONFIG_DEBUG_KERNEL
 225 SYSFS_PMCSETUP(hid0, SPRN_HID0);
 226 SYSFS_PMCSETUP(hid1, SPRN_HID1);
 227 SYSFS_PMCSETUP(hid4, SPRN_HID4);
 228 SYSFS_PMCSETUP(hid5, SPRN_HID5);
 229 SYSFS_PMCSETUP(ima0, SPRN_PA6T_IMA0);
 230 SYSFS_PMCSETUP(ima1, SPRN_PA6T_IMA1);
 231 SYSFS_PMCSETUP(ima2, SPRN_PA6T_IMA2);
 232 SYSFS_PMCSETUP(ima3, SPRN_PA6T_IMA3);
 233 SYSFS_PMCSETUP(ima4, SPRN_PA6T_IMA4);
 234 SYSFS_PMCSETUP(ima5, SPRN_PA6T_IMA5);
 235 SYSFS_PMCSETUP(ima6, SPRN_PA6T_IMA6);
 236 SYSFS_PMCSETUP(ima7, SPRN_PA6T_IMA7);
 237 SYSFS_PMCSETUP(ima8, SPRN_PA6T_IMA8);
 238 SYSFS_PMCSETUP(ima9, SPRN_PA6T_IMA9);
 239 SYSFS_PMCSETUP(imaat, SPRN_PA6T_IMAAT);
 240 SYSFS_PMCSETUP(btcr, SPRN_PA6T_BTCR);
 241 SYSFS_PMCSETUP(pccr, SPRN_PA6T_PCCR);
 242 SYSFS_PMCSETUP(rpccr, SPRN_PA6T_RPCCR);
 243 SYSFS_PMCSETUP(der, SPRN_PA6T_DER);
 244 SYSFS_PMCSETUP(mer, SPRN_PA6T_MER);
 245 SYSFS_PMCSETUP(ber, SPRN_PA6T_BER);
 246 SYSFS_PMCSETUP(ier, SPRN_PA6T_IER);
 247 SYSFS_PMCSETUP(sier, SPRN_PA6T_SIER);
 248 SYSFS_PMCSETUP(siar, SPRN_PA6T_SIAR);
 249 SYSFS_PMCSETUP(tsr0, SPRN_PA6T_TSR0);
 250 SYSFS_PMCSETUP(tsr1, SPRN_PA6T_TSR1);
 251 SYSFS_PMCSETUP(tsr2, SPRN_PA6T_TSR2);
 252 SYSFS_PMCSETUP(tsr3, SPRN_PA6T_TSR3);
 253 #endif /* CONFIG_DEBUG_KERNEL */
 254 #endif /* HAS_PPC_PMC_PA6T */
 255
 256 #ifdef HAS_PPC_PMC_IBM
 257 static 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
 264 static 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
 271 static 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
 285 static 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
 328 static 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
 396 static 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
 466 static 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
 486 static struct notifier_block __cpuinitdata sysfs_cpu_nb = {
 487         .notifier_call  = sysfs_cpu_notify,
 488 };
 489
 490 static DEFINE_MUTEX(cpu_mutex);
 491
 492 int 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 }
 505 EXPORT_SYMBOL_GPL(cpu_add_sysdev_attr);
 506
 507 int 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 }
 524 EXPORT_SYMBOL_GPL(cpu_add_sysdev_attr_group);
 525
 526
 527 void 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 }
 539 EXPORT_SYMBOL_GPL(cpu_remove_sysdev_attr);
 540
 541 void 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 }
 555 EXPORT_SYMBOL_GPL(cpu_remove_sysdev_attr_group);
 556
 557
 558 /* NUMA stuff */
 559
 560 #ifdef CONFIG_NUMA
 561 static void register_nodes(void)
 562 {
 563         int i;
 564
 565         for (i = 0; i < MAX_NUMNODES; i++)
 566                 register_one_node(i);
 567 }
 568
 569 int 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 }
 575 EXPORT_SYMBOL_GPL(sysfs_add_device_to_node);
 576
 577 void 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 }
 582 EXPORT_SYMBOL_GPL(sysfs_remove_device_from_node);
 583
 584 #else
 585 static void register_nodes(void)
 586 {
 587         return;
 588 }
 589
 590 #endif
 591
 592 /* Only valid if CPU is present. */
 593 static 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 }
 600 static SYSDEV_ATTR(physical_id, 0444, show_physical_id, NULL);
 601
 602 static 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 }
 634 subsys_initcall(topology_init);