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