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
  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(long, smt_snooze_delay) = { 100 };
  38
  39 static ssize_t store_smt_snooze_delay(struct device *dev,
  40                                       struct device_attribute *attr,
  41                                       const char *buf,
  42                                       size_t count)
  43 {
  44         struct cpu *cpu = container_of(dev, struct cpu, dev);
  45         ssize_t ret;
  46         long snooze;
  47
  48         ret = sscanf(buf, "%ld", &snooze);
  49         if (ret != 1)
  50                 return -EINVAL;
  51
  52         per_cpu(smt_snooze_delay, cpu->dev.id) = snooze;
  53         update_smt_snooze_delay(snooze);
  54
  55         return count;
  56 }
  57
  58 static ssize_t show_smt_snooze_delay(struct device *dev,
  59                                      struct device_attribute *attr,
  60                                      char *buf)
  61 {
  62         struct cpu *cpu = container_of(dev, struct cpu, dev);
  63
  64         return sprintf(buf, "%ld\n", per_cpu(smt_snooze_delay, cpu->dev.id));
  65 }
  66
  67 static DEVICE_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 device *dev, \
 121                         struct device_attribute *attr, \
 122                         char *buf) \
 123 { \
 124         struct cpu *cpu = container_of(dev, struct cpu, dev); \
 125         unsigned long val; \
 126         smp_call_function_single(cpu->dev.id, read_##NAME, &val, 1);    \
 127         return sprintf(buf, "%lx\n", val); \
 128 } \
 129 static ssize_t __used \
 130         store_##NAME(struct device *dev, struct device_attribute *attr, \
 131                         const char *buf, size_t count) \
 132 { \
 133         struct cpu *cpu = container_of(dev, struct cpu, dev); \
 134         unsigned long val; \
 135         int ret = sscanf(buf, "%lx", &val); \
 136         if (ret != 1) \
 137                 return -EINVAL; \
 138         smp_call_function_single(cpu->dev.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 SYSFS_PMCSETUP(pir, SPRN_PIR);
 181
 182 static DEVICE_ATTR(mmcra, 0600, show_mmcra, store_mmcra);
 183 static DEVICE_ATTR(spurr, 0600, show_spurr, NULL);
 184 static DEVICE_ATTR(dscr, 0600, show_dscr, store_dscr);
 185 static DEVICE_ATTR(purr, 0600, show_purr, store_purr);
 186 static DEVICE_ATTR(pir, 0400, show_pir, NULL);
 187
 188 unsigned long dscr_default = 0;
 189 EXPORT_SYMBOL(dscr_default);
 190
 191 static ssize_t show_dscr_default(struct device *dev,
 192                 struct device_attribute *attr, char *buf)
 193 {
 194         return sprintf(buf, "%lx\n", dscr_default);
 195 }
 196
 197 static void update_dscr(void *dummy)
 198 {
 199         if (!current->thread.dscr_inherit)
 200                 mtspr(SPRN_DSCR, dscr_default);
 201 }
 202
 203 static ssize_t __used store_dscr_default(struct device *dev,
 204                 struct device_attribute *attr, const char *buf,
 205                 size_t count)
 206 {
 207         unsigned long val;
 208         int ret = 0;
 209
 210         ret = sscanf(buf, "%lx", &val);
 211         if (ret != 1)
 212                 return -EINVAL;
 213         dscr_default = val;
 214
 215         on_each_cpu(update_dscr, NULL, 1);
 216
 217         return count;
 218 }
 219
 220 static DEVICE_ATTR(dscr_default, 0600,
 221                 show_dscr_default, store_dscr_default);
 222
 223 static void sysfs_create_dscr_default(void)
 224 {
 225         int err = 0;
 226         if (cpu_has_feature(CPU_FTR_DSCR))
 227                 err = device_create_file(cpu_subsys.dev_root, &dev_attr_dscr_default);
 228 }
 229 #endif /* CONFIG_PPC64 */
 230
 231 #ifdef HAS_PPC_PMC_PA6T
 232 SYSFS_PMCSETUP(pa6t_pmc0, SPRN_PA6T_PMC0);
 233 SYSFS_PMCSETUP(pa6t_pmc1, SPRN_PA6T_PMC1);
 234 SYSFS_PMCSETUP(pa6t_pmc2, SPRN_PA6T_PMC2);
 235 SYSFS_PMCSETUP(pa6t_pmc3, SPRN_PA6T_PMC3);
 236 SYSFS_PMCSETUP(pa6t_pmc4, SPRN_PA6T_PMC4);
 237 SYSFS_PMCSETUP(pa6t_pmc5, SPRN_PA6T_PMC5);
 238 #ifdef CONFIG_DEBUG_KERNEL
 239 SYSFS_PMCSETUP(hid0, SPRN_HID0);
 240 SYSFS_PMCSETUP(hid1, SPRN_HID1);
 241 SYSFS_PMCSETUP(hid4, SPRN_HID4);
 242 SYSFS_PMCSETUP(hid5, SPRN_HID5);
 243 SYSFS_PMCSETUP(ima0, SPRN_PA6T_IMA0);
 244 SYSFS_PMCSETUP(ima1, SPRN_PA6T_IMA1);
 245 SYSFS_PMCSETUP(ima2, SPRN_PA6T_IMA2);
 246 SYSFS_PMCSETUP(ima3, SPRN_PA6T_IMA3);
 247 SYSFS_PMCSETUP(ima4, SPRN_PA6T_IMA4);
 248 SYSFS_PMCSETUP(ima5, SPRN_PA6T_IMA5);
 249 SYSFS_PMCSETUP(ima6, SPRN_PA6T_IMA6);
 250 SYSFS_PMCSETUP(ima7, SPRN_PA6T_IMA7);
 251 SYSFS_PMCSETUP(ima8, SPRN_PA6T_IMA8);
 252 SYSFS_PMCSETUP(ima9, SPRN_PA6T_IMA9);
 253 SYSFS_PMCSETUP(imaat, SPRN_PA6T_IMAAT);
 254 SYSFS_PMCSETUP(btcr, SPRN_PA6T_BTCR);
 255 SYSFS_PMCSETUP(pccr, SPRN_PA6T_PCCR);
 256 SYSFS_PMCSETUP(rpccr, SPRN_PA6T_RPCCR);
 257 SYSFS_PMCSETUP(der, SPRN_PA6T_DER);
 258 SYSFS_PMCSETUP(mer, SPRN_PA6T_MER);
 259 SYSFS_PMCSETUP(ber, SPRN_PA6T_BER);
 260 SYSFS_PMCSETUP(ier, SPRN_PA6T_IER);
 261 SYSFS_PMCSETUP(sier, SPRN_PA6T_SIER);
 262 SYSFS_PMCSETUP(siar, SPRN_PA6T_SIAR);
 263 SYSFS_PMCSETUP(tsr0, SPRN_PA6T_TSR0);
 264 SYSFS_PMCSETUP(tsr1, SPRN_PA6T_TSR1);
 265 SYSFS_PMCSETUP(tsr2, SPRN_PA6T_TSR2);
 266 SYSFS_PMCSETUP(tsr3, SPRN_PA6T_TSR3);
 267 #endif /* CONFIG_DEBUG_KERNEL */
 268 #endif /* HAS_PPC_PMC_PA6T */
 269
 270 #ifdef HAS_PPC_PMC_IBM
 271 static struct device_attribute ibm_common_attrs[] = {
 272         __ATTR(mmcr0, 0600, show_mmcr0, store_mmcr0),
 273         __ATTR(mmcr1, 0600, show_mmcr1, store_mmcr1),
 274 };
 275 #endif /* HAS_PPC_PMC_G4 */
 276
 277 #ifdef HAS_PPC_PMC_G4
 278 static struct device_attribute g4_common_attrs[] = {
 279         __ATTR(mmcr0, 0600, show_mmcr0, store_mmcr0),
 280         __ATTR(mmcr1, 0600, show_mmcr1, store_mmcr1),
 281         __ATTR(mmcr2, 0600, show_mmcr2, store_mmcr2),
 282 };
 283 #endif /* HAS_PPC_PMC_G4 */
 284
 285 static struct device_attribute classic_pmc_attrs[] = {
 286         __ATTR(pmc1, 0600, show_pmc1, store_pmc1),
 287         __ATTR(pmc2, 0600, show_pmc2, store_pmc2),
 288         __ATTR(pmc3, 0600, show_pmc3, store_pmc3),
 289         __ATTR(pmc4, 0600, show_pmc4, store_pmc4),
 290         __ATTR(pmc5, 0600, show_pmc5, store_pmc5),
 291         __ATTR(pmc6, 0600, show_pmc6, store_pmc6),
 292 #ifdef CONFIG_PPC64
 293         __ATTR(pmc7, 0600, show_pmc7, store_pmc7),
 294         __ATTR(pmc8, 0600, show_pmc8, store_pmc8),
 295 #endif
 296 };
 297
 298 #ifdef HAS_PPC_PMC_PA6T
 299 static struct device_attribute pa6t_attrs[] = {
 300         __ATTR(mmcr0, 0600, show_mmcr0, store_mmcr0),
 301         __ATTR(mmcr1, 0600, show_mmcr1, store_mmcr1),
 302         __ATTR(pmc0, 0600, show_pa6t_pmc0, store_pa6t_pmc0),
 303         __ATTR(pmc1, 0600, show_pa6t_pmc1, store_pa6t_pmc1),
 304         __ATTR(pmc2, 0600, show_pa6t_pmc2, store_pa6t_pmc2),
 305         __ATTR(pmc3, 0600, show_pa6t_pmc3, store_pa6t_pmc3),
 306         __ATTR(pmc4, 0600, show_pa6t_pmc4, store_pa6t_pmc4),
 307         __ATTR(pmc5, 0600, show_pa6t_pmc5, store_pa6t_pmc5),
 308 #ifdef CONFIG_DEBUG_KERNEL
 309         __ATTR(hid0, 0600, show_hid0, store_hid0),
 310         __ATTR(hid1, 0600, show_hid1, store_hid1),
 311         __ATTR(hid4, 0600, show_hid4, store_hid4),
 312         __ATTR(hid5, 0600, show_hid5, store_hid5),
 313         __ATTR(ima0, 0600, show_ima0, store_ima0),
 314         __ATTR(ima1, 0600, show_ima1, store_ima1),
 315         __ATTR(ima2, 0600, show_ima2, store_ima2),
 316         __ATTR(ima3, 0600, show_ima3, store_ima3),
 317         __ATTR(ima4, 0600, show_ima4, store_ima4),
 318         __ATTR(ima5, 0600, show_ima5, store_ima5),
 319         __ATTR(ima6, 0600, show_ima6, store_ima6),
 320         __ATTR(ima7, 0600, show_ima7, store_ima7),
 321         __ATTR(ima8, 0600, show_ima8, store_ima8),
 322         __ATTR(ima9, 0600, show_ima9, store_ima9),
 323         __ATTR(imaat, 0600, show_imaat, store_imaat),
 324         __ATTR(btcr, 0600, show_btcr, store_btcr),
 325         __ATTR(pccr, 0600, show_pccr, store_pccr),
 326         __ATTR(rpccr, 0600, show_rpccr, store_rpccr),
 327         __ATTR(der, 0600, show_der, store_der),
 328         __ATTR(mer, 0600, show_mer, store_mer),
 329         __ATTR(ber, 0600, show_ber, store_ber),
 330         __ATTR(ier, 0600, show_ier, store_ier),
 331         __ATTR(sier, 0600, show_sier, store_sier),
 332         __ATTR(siar, 0600, show_siar, store_siar),
 333         __ATTR(tsr0, 0600, show_tsr0, store_tsr0),
 334         __ATTR(tsr1, 0600, show_tsr1, store_tsr1),
 335         __ATTR(tsr2, 0600, show_tsr2, store_tsr2),
 336         __ATTR(tsr3, 0600, show_tsr3, store_tsr3),
 337 #endif /* CONFIG_DEBUG_KERNEL */
 338 };
 339 #endif /* HAS_PPC_PMC_PA6T */
 340 #endif /* HAS_PPC_PMC_CLASSIC */
 341
 342 static void __cpuinit register_cpu_online(unsigned int cpu)
 343 {
 344         struct cpu *c = &per_cpu(cpu_devices, cpu);
 345         struct device *s = &c->dev;
 346         struct device_attribute *attrs, *pmc_attrs;
 347         int i, nattrs;
 348
 349 #ifdef CONFIG_PPC64
 350         if (cpu_has_feature(CPU_FTR_SMT))
 351                 device_create_file(s, &dev_attr_smt_snooze_delay);
 352 #endif
 353
 354         /* PMC stuff */
 355         switch (cur_cpu_spec->pmc_type) {
 356 #ifdef HAS_PPC_PMC_IBM
 357         case PPC_PMC_IBM:
 358                 attrs = ibm_common_attrs;
 359                 nattrs = sizeof(ibm_common_attrs) / sizeof(struct device_attribute);
 360                 pmc_attrs = classic_pmc_attrs;
 361                 break;
 362 #endif /* HAS_PPC_PMC_IBM */
 363 #ifdef HAS_PPC_PMC_G4
 364         case PPC_PMC_G4:
 365                 attrs = g4_common_attrs;
 366                 nattrs = sizeof(g4_common_attrs) / sizeof(struct device_attribute);
 367                 pmc_attrs = classic_pmc_attrs;
 368                 break;
 369 #endif /* HAS_PPC_PMC_G4 */
 370 #ifdef HAS_PPC_PMC_PA6T
 371         case PPC_PMC_PA6T:
 372                 /* PA Semi starts counting at PMC0 */
 373                 attrs = pa6t_attrs;
 374                 nattrs = sizeof(pa6t_attrs) / sizeof(struct device_attribute);
 375                 pmc_attrs = NULL;
 376                 break;
 377 #endif /* HAS_PPC_PMC_PA6T */
 378         default:
 379                 attrs = NULL;
 380                 nattrs = 0;
 381                 pmc_attrs = NULL;
 382         }
 383
 384         for (i = 0; i < nattrs; i++)
 385                 device_create_file(s, &attrs[i]);
 386
 387         if (pmc_attrs)
 388                 for (i = 0; i < cur_cpu_spec->num_pmcs; i++)
 389                         device_create_file(s, &pmc_attrs[i]);
 390
 391 #ifdef CONFIG_PPC64
 392         if (cpu_has_feature(CPU_FTR_MMCRA))
 393                 device_create_file(s, &dev_attr_mmcra);
 394
 395         if (cpu_has_feature(CPU_FTR_PURR))
 396                 device_create_file(s, &dev_attr_purr);
 397
 398         if (cpu_has_feature(CPU_FTR_SPURR))
 399                 device_create_file(s, &dev_attr_spurr);
 400
 401         if (cpu_has_feature(CPU_FTR_DSCR))
 402                 device_create_file(s, &dev_attr_dscr);
 403
 404         if (cpu_has_feature(CPU_FTR_PPCAS_ARCH_V2))
 405                 device_create_file(s, &dev_attr_pir);
 406 #endif /* CONFIG_PPC64 */
 407
 408         cacheinfo_cpu_online(cpu);
 409 }
 410
 411 #ifdef CONFIG_HOTPLUG_CPU
 412 static void unregister_cpu_online(unsigned int cpu)
 413 {
 414         struct cpu *c = &per_cpu(cpu_devices, cpu);
 415         struct device *s = &c->dev;
 416         struct device_attribute *attrs, *pmc_attrs;
 417         int i, nattrs;
 418
 419         BUG_ON(!c->hotpluggable);
 420
 421 #ifdef CONFIG_PPC64
 422         if (cpu_has_feature(CPU_FTR_SMT))
 423                 device_remove_file(s, &dev_attr_smt_snooze_delay);
 424 #endif
 425
 426         /* PMC stuff */
 427         switch (cur_cpu_spec->pmc_type) {
 428 #ifdef HAS_PPC_PMC_IBM
 429         case PPC_PMC_IBM:
 430                 attrs = ibm_common_attrs;
 431                 nattrs = sizeof(ibm_common_attrs) / sizeof(struct device_attribute);
 432                 pmc_attrs = classic_pmc_attrs;
 433                 break;
 434 #endif /* HAS_PPC_PMC_IBM */
 435 #ifdef HAS_PPC_PMC_G4
 436         case PPC_PMC_G4:
 437                 attrs = g4_common_attrs;
 438                 nattrs = sizeof(g4_common_attrs) / sizeof(struct device_attribute);
 439                 pmc_attrs = classic_pmc_attrs;
 440                 break;
 441 #endif /* HAS_PPC_PMC_G4 */
 442 #ifdef HAS_PPC_PMC_PA6T
 443         case PPC_PMC_PA6T:
 444                 /* PA Semi starts counting at PMC0 */
 445                 attrs = pa6t_attrs;
 446                 nattrs = sizeof(pa6t_attrs) / sizeof(struct device_attribute);
 447                 pmc_attrs = NULL;
 448                 break;
 449 #endif /* HAS_PPC_PMC_PA6T */
 450         default:
 451                 attrs = NULL;
 452                 nattrs = 0;
 453                 pmc_attrs = NULL;
 454         }
 455
 456         for (i = 0; i < nattrs; i++)
 457                 device_remove_file(s, &attrs[i]);
 458
 459         if (pmc_attrs)
 460                 for (i = 0; i < cur_cpu_spec->num_pmcs; i++)
 461                         device_remove_file(s, &pmc_attrs[i]);
 462
 463 #ifdef CONFIG_PPC64
 464         if (cpu_has_feature(CPU_FTR_MMCRA))
 465                 device_remove_file(s, &dev_attr_mmcra);
 466
 467         if (cpu_has_feature(CPU_FTR_PURR))
 468                 device_remove_file(s, &dev_attr_purr);
 469
 470         if (cpu_has_feature(CPU_FTR_SPURR))
 471                 device_remove_file(s, &dev_attr_spurr);
 472
 473         if (cpu_has_feature(CPU_FTR_DSCR))
 474                 device_remove_file(s, &dev_attr_dscr);
 475
 476         if (cpu_has_feature(CPU_FTR_PPCAS_ARCH_V2))
 477                 device_remove_file(s, &dev_attr_pir);
 478 #endif /* CONFIG_PPC64 */
 479
 480         cacheinfo_cpu_offline(cpu);
 481 }
 482
 483 #ifdef CONFIG_ARCH_CPU_PROBE_RELEASE
 484 ssize_t arch_cpu_probe(const char *buf, size_t count)
 485 {
 486         if (ppc_md.cpu_probe)
 487                 return ppc_md.cpu_probe(buf, count);
 488
 489         return -EINVAL;
 490 }
 491
 492 ssize_t arch_cpu_release(const char *buf, size_t count)
 493 {
 494         if (ppc_md.cpu_release)
 495                 return ppc_md.cpu_release(buf, count);
 496
 497         return -EINVAL;
 498 }
 499 #endif /* CONFIG_ARCH_CPU_PROBE_RELEASE */
 500
 501 #endif /* CONFIG_HOTPLUG_CPU */
 502
 503 static int __cpuinit sysfs_cpu_notify(struct notifier_block *self,
 504                                       unsigned long action, void *hcpu)
 505 {
 506         unsigned int cpu = (unsigned int)(long)hcpu;
 507
 508         switch (action) {
 509         case CPU_ONLINE:
 510         case CPU_ONLINE_FROZEN:
 511                 register_cpu_online(cpu);
 512                 break;
 513 #ifdef CONFIG_HOTPLUG_CPU
 514         case CPU_DEAD:
 515         case CPU_DEAD_FROZEN:
 516                 unregister_cpu_online(cpu);
 517                 break;
 518 #endif
 519         }
 520         return NOTIFY_OK;
 521 }
 522
 523 static struct notifier_block __cpuinitdata sysfs_cpu_nb = {
 524         .notifier_call  = sysfs_cpu_notify,
 525 };
 526
 527 static DEFINE_MUTEX(cpu_mutex);
 528
 529 int cpu_add_dev_attr(struct device_attribute *attr)
 530 {
 531         int cpu;
 532
 533         mutex_lock(&cpu_mutex);
 534
 535         for_each_possible_cpu(cpu) {
 536                 device_create_file(get_cpu_device(cpu), attr);
 537         }
 538
 539         mutex_unlock(&cpu_mutex);
 540         return 0;
 541 }
 542 EXPORT_SYMBOL_GPL(cpu_add_dev_attr);
 543
 544 int cpu_add_dev_attr_group(struct attribute_group *attrs)
 545 {
 546         int cpu;
 547         struct device *dev;
 548         int ret;
 549
 550         mutex_lock(&cpu_mutex);
 551
 552         for_each_possible_cpu(cpu) {
 553                 dev = get_cpu_device(cpu);
 554                 ret = sysfs_create_group(&dev->kobj, attrs);
 555                 WARN_ON(ret != 0);
 556         }
 557
 558         mutex_unlock(&cpu_mutex);
 559         return 0;
 560 }
 561 EXPORT_SYMBOL_GPL(cpu_add_dev_attr_group);
 562
 563
 564 void cpu_remove_dev_attr(struct device_attribute *attr)
 565 {
 566         int cpu;
 567
 568         mutex_lock(&cpu_mutex);
 569
 570         for_each_possible_cpu(cpu) {
 571                 device_remove_file(get_cpu_device(cpu), attr);
 572         }
 573
 574         mutex_unlock(&cpu_mutex);
 575 }
 576 EXPORT_SYMBOL_GPL(cpu_remove_dev_attr);
 577
 578 void cpu_remove_dev_attr_group(struct attribute_group *attrs)
 579 {
 580         int cpu;
 581         struct device *dev;
 582
 583         mutex_lock(&cpu_mutex);
 584
 585         for_each_possible_cpu(cpu) {
 586                 dev = get_cpu_device(cpu);
 587                 sysfs_remove_group(&dev->kobj, attrs);
 588         }
 589
 590         mutex_unlock(&cpu_mutex);
 591 }
 592 EXPORT_SYMBOL_GPL(cpu_remove_dev_attr_group);
 593
 594
 595 /* NUMA stuff */
 596
 597 #ifdef CONFIG_NUMA
 598 static void register_nodes(void)
 599 {
 600         int i;
 601
 602         for (i = 0; i < MAX_NUMNODES; i++)
 603                 register_one_node(i);
 604 }
 605
 606 int sysfs_add_device_to_node(struct device *dev, int nid)
 607 {
 608         struct node *node = &node_devices[nid];
 609         return sysfs_create_link(&node->dev.kobj, &dev->kobj,
 610                         kobject_name(&dev->kobj));
 611 }
 612 EXPORT_SYMBOL_GPL(sysfs_add_device_to_node);
 613
 614 void sysfs_remove_device_from_node(struct device *dev, int nid)
 615 {
 616         struct node *node = &node_devices[nid];
 617         sysfs_remove_link(&node->dev.kobj, kobject_name(&dev->kobj));
 618 }
 619 EXPORT_SYMBOL_GPL(sysfs_remove_device_from_node);
 620
 621 #else
 622 static void register_nodes(void)
 623 {
 624         return;
 625 }
 626
 627 #endif
 628
 629 /* Only valid if CPU is present. */
 630 static ssize_t show_physical_id(struct device *dev,
 631                                 struct device_attribute *attr, char *buf)
 632 {
 633         struct cpu *cpu = container_of(dev, struct cpu, dev);
 634
 635         return sprintf(buf, "%d\n", get_hard_smp_processor_id(cpu->dev.id));
 636 }
 637 static DEVICE_ATTR(physical_id, 0444, show_physical_id, NULL);
 638
 639 static int __init topology_init(void)
 640 {
 641         int cpu;
 642
 643         register_nodes();
 644         register_cpu_notifier(&sysfs_cpu_nb);
 645
 646         for_each_possible_cpu(cpu) {
 647                 struct cpu *c = &per_cpu(cpu_devices, cpu);
 648
 649                 /*
 650                  * For now, we just see if the system supports making
 651                  * the RTAS calls for CPU hotplug.  But, there may be a
 652                  * more comprehensive way to do this for an individual
 653                  * CPU.  For instance, the boot cpu might never be valid
 654                  * for hotplugging.
 655                  */
 656                 if (ppc_md.cpu_die)
 657                         c->hotpluggable = 1;
 658
 659                 if (cpu_online(cpu) || c->hotpluggable) {
 660                         register_cpu(c, cpu);
 661
 662                         device_create_file(&c->dev, &dev_attr_physical_id);
 663                 }
 664
 665                 if (cpu_online(cpu))
 666                         register_cpu_online(cpu);
 667         }
 668 #ifdef CONFIG_PPC64
 669         sysfs_create_dscr_default();
 670 #endif /* CONFIG_PPC64 */
 671
 672         return 0;
 673 }
 674 subsys_initcall(topology_init);