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 #include <asm/firmware.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 device *dev,
  41                                       struct device_attribute *attr,
  42                                       const char *buf,
  43                                       size_t count)
  44 {
  45         struct cpu *cpu = container_of(dev, struct cpu, dev);
  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->dev.id) = snooze;
  54         update_smt_snooze_delay(cpu->dev.id, snooze);
  55
  56         return count;
  57 }
  58
  59 static ssize_t show_smt_snooze_delay(struct device *dev,
  60                                      struct device_attribute *attr,
  61                                      char *buf)
  62 {
  63         struct cpu *cpu = container_of(dev, struct cpu, dev);
  64
  65         return sprintf(buf, "%ld\n", per_cpu(smt_snooze_delay, cpu->dev.id));
  66 }
  67
  68 static DEVICE_ATTR(smt_snooze_delay, 0644, show_smt_snooze_delay,
  69                    store_smt_snooze_delay);
  70
  71 static int __init setup_smt_snooze_delay(char *str)
  72 {
  73         unsigned int cpu;
  74         long snooze;
  75
  76         if (!cpu_has_feature(CPU_FTR_SMT))
  77                 return 1;
  78
  79         snooze = simple_strtol(str, NULL, 10);
  80         for_each_possible_cpu(cpu)
  81                 per_cpu(smt_snooze_delay, cpu) = snooze;
  82
  83         return 1;
  84 }
  85 __setup("smt-snooze-delay=", setup_smt_snooze_delay);
  86
  87 #endif /* CONFIG_PPC64 */
  88
  89 /*
  90  * Enabling PMCs will slow partition context switch times so we only do
  91  * it the first time we write to the PMCs.
  92  */
  93
  94 static DEFINE_PER_CPU(char, pmcs_enabled);
  95
  96 void ppc_enable_pmcs(void)
  97 {
  98         ppc_set_pmu_inuse(1);
  99
 100         /* Only need to enable them once */
 101         if (__get_cpu_var(pmcs_enabled))
 102                 return;
 103
 104         __get_cpu_var(pmcs_enabled) = 1;
 105
 106         if (ppc_md.enable_pmcs)
 107                 ppc_md.enable_pmcs();
 108 }
 109 EXPORT_SYMBOL(ppc_enable_pmcs);
 110
 111 #define SYSFS_PMCSETUP(NAME, ADDRESS) \
 112 static void read_##NAME(void *val) \
 113 { \
 114         *(unsigned long *)val = mfspr(ADDRESS); \
 115 } \
 116 static void write_##NAME(void *val) \
 117 { \
 118         ppc_enable_pmcs(); \
 119         mtspr(ADDRESS, *(unsigned long *)val);  \
 120 } \
 121 static ssize_t show_##NAME(struct device *dev, \
 122                         struct device_attribute *attr, \
 123                         char *buf) \
 124 { \
 125         struct cpu *cpu = container_of(dev, struct cpu, dev); \
 126         unsigned long val; \
 127         smp_call_function_single(cpu->dev.id, read_##NAME, &val, 1);    \
 128         return sprintf(buf, "%lx\n", val); \
 129 } \
 130 static ssize_t __used \
 131         store_##NAME(struct device *dev, struct device_attribute *attr, \
 132                         const char *buf, size_t count) \
 133 { \
 134         struct cpu *cpu = container_of(dev, struct cpu, dev); \
 135         unsigned long val; \
 136         int ret = sscanf(buf, "%lx", &val); \
 137         if (ret != 1) \
 138                 return -EINVAL; \
 139         smp_call_function_single(cpu->dev.id, write_##NAME, &val, 1); \
 140         return count; \
 141 }
 142
 143
 144 /* Let's define all possible registers, we'll only hook up the ones
 145  * that are implemented on the current processor
 146  */
 147
 148 #if defined(CONFIG_PPC64)
 149 #define HAS_PPC_PMC_CLASSIC     1
 150 #define HAS_PPC_PMC_IBM         1
 151 #define HAS_PPC_PMC_PA6T        1
 152 #elif defined(CONFIG_6xx)
 153 #define HAS_PPC_PMC_CLASSIC     1
 154 #define HAS_PPC_PMC_IBM         1
 155 #define HAS_PPC_PMC_G4          1
 156 #endif
 157
 158
 159 #ifdef HAS_PPC_PMC_CLASSIC
 160 SYSFS_PMCSETUP(mmcr0, SPRN_MMCR0);
 161 SYSFS_PMCSETUP(mmcr1, SPRN_MMCR1);
 162 SYSFS_PMCSETUP(pmc1, SPRN_PMC1);
 163 SYSFS_PMCSETUP(pmc2, SPRN_PMC2);
 164 SYSFS_PMCSETUP(pmc3, SPRN_PMC3);
 165 SYSFS_PMCSETUP(pmc4, SPRN_PMC4);
 166 SYSFS_PMCSETUP(pmc5, SPRN_PMC5);
 167 SYSFS_PMCSETUP(pmc6, SPRN_PMC6);
 168
 169 #ifdef HAS_PPC_PMC_G4
 170 SYSFS_PMCSETUP(mmcr2, SPRN_MMCR2);
 171 #endif
 172
 173 #ifdef CONFIG_PPC64
 174 SYSFS_PMCSETUP(pmc7, SPRN_PMC7);
 175 SYSFS_PMCSETUP(pmc8, SPRN_PMC8);
 176
 177 SYSFS_PMCSETUP(mmcra, SPRN_MMCRA);
 178 SYSFS_PMCSETUP(purr, SPRN_PURR);
 179 SYSFS_PMCSETUP(spurr, SPRN_SPURR);
 180 SYSFS_PMCSETUP(dscr, SPRN_DSCR);
 181 SYSFS_PMCSETUP(pir, SPRN_PIR);
 182
 183 /*
 184   Lets only enable read for phyp resources and
 185   enable write when needed with a separate function.
 186   Lets be conservative and default to pseries.
 187 */
 188 static DEVICE_ATTR(mmcra, 0600, show_mmcra, store_mmcra);
 189 static DEVICE_ATTR(spurr, 0400, show_spurr, NULL);
 190 static DEVICE_ATTR(dscr, 0600, show_dscr, store_dscr);
 191 static DEVICE_ATTR(purr, 0400, show_purr, store_purr);
 192 static DEVICE_ATTR(pir, 0400, show_pir, NULL);
 193
 194 unsigned long dscr_default = 0;
 195 EXPORT_SYMBOL(dscr_default);
 196
 197 static void add_write_permission_dev_attr(struct device_attribute *attr)
 198 {
 199         attr->attr.mode |= 0200;
 200 }
 201
 202 static ssize_t show_dscr_default(struct device *dev,
 203                 struct device_attribute *attr, char *buf)
 204 {
 205         return sprintf(buf, "%lx\n", dscr_default);
 206 }
 207
 208 static void update_dscr(void *dummy)
 209 {
 210         if (!current->thread.dscr_inherit) {
 211                 current->thread.dscr = dscr_default;
 212                 mtspr(SPRN_DSCR, dscr_default);
 213         }
 214 }
 215
 216 static ssize_t __used store_dscr_default(struct device *dev,
 217                 struct device_attribute *attr, const char *buf,
 218                 size_t count)
 219 {
 220         unsigned long val;
 221         int ret = 0;
 222
 223         ret = sscanf(buf, "%lx", &val);
 224         if (ret != 1)
 225                 return -EINVAL;
 226         dscr_default = val;
 227
 228         on_each_cpu(update_dscr, NULL, 1);
 229
 230         return count;
 231 }
 232
 233 static DEVICE_ATTR(dscr_default, 0600,
 234                 show_dscr_default, store_dscr_default);
 235
 236 static void sysfs_create_dscr_default(void)
 237 {
 238         int err = 0;
 239         if (cpu_has_feature(CPU_FTR_DSCR))
 240                 err = device_create_file(cpu_subsys.dev_root, &dev_attr_dscr_default);
 241 }
 242 #endif /* CONFIG_PPC64 */
 243
 244 #ifdef HAS_PPC_PMC_PA6T
 245 SYSFS_PMCSETUP(pa6t_pmc0, SPRN_PA6T_PMC0);
 246 SYSFS_PMCSETUP(pa6t_pmc1, SPRN_PA6T_PMC1);
 247 SYSFS_PMCSETUP(pa6t_pmc2, SPRN_PA6T_PMC2);
 248 SYSFS_PMCSETUP(pa6t_pmc3, SPRN_PA6T_PMC3);
 249 SYSFS_PMCSETUP(pa6t_pmc4, SPRN_PA6T_PMC4);
 250 SYSFS_PMCSETUP(pa6t_pmc5, SPRN_PA6T_PMC5);
 251 #ifdef CONFIG_DEBUG_KERNEL
 252 SYSFS_PMCSETUP(hid0, SPRN_HID0);
 253 SYSFS_PMCSETUP(hid1, SPRN_HID1);
 254 SYSFS_PMCSETUP(hid4, SPRN_HID4);
 255 SYSFS_PMCSETUP(hid5, SPRN_HID5);
 256 SYSFS_PMCSETUP(ima0, SPRN_PA6T_IMA0);
 257 SYSFS_PMCSETUP(ima1, SPRN_PA6T_IMA1);
 258 SYSFS_PMCSETUP(ima2, SPRN_PA6T_IMA2);
 259 SYSFS_PMCSETUP(ima3, SPRN_PA6T_IMA3);
 260 SYSFS_PMCSETUP(ima4, SPRN_PA6T_IMA4);
 261 SYSFS_PMCSETUP(ima5, SPRN_PA6T_IMA5);
 262 SYSFS_PMCSETUP(ima6, SPRN_PA6T_IMA6);
 263 SYSFS_PMCSETUP(ima7, SPRN_PA6T_IMA7);
 264 SYSFS_PMCSETUP(ima8, SPRN_PA6T_IMA8);
 265 SYSFS_PMCSETUP(ima9, SPRN_PA6T_IMA9);
 266 SYSFS_PMCSETUP(imaat, SPRN_PA6T_IMAAT);
 267 SYSFS_PMCSETUP(btcr, SPRN_PA6T_BTCR);
 268 SYSFS_PMCSETUP(pccr, SPRN_PA6T_PCCR);
 269 SYSFS_PMCSETUP(rpccr, SPRN_PA6T_RPCCR);
 270 SYSFS_PMCSETUP(der, SPRN_PA6T_DER);
 271 SYSFS_PMCSETUP(mer, SPRN_PA6T_MER);
 272 SYSFS_PMCSETUP(ber, SPRN_PA6T_BER);
 273 SYSFS_PMCSETUP(ier, SPRN_PA6T_IER);
 274 SYSFS_PMCSETUP(sier, SPRN_PA6T_SIER);
 275 SYSFS_PMCSETUP(siar, SPRN_PA6T_SIAR);
 276 SYSFS_PMCSETUP(tsr0, SPRN_PA6T_TSR0);
 277 SYSFS_PMCSETUP(tsr1, SPRN_PA6T_TSR1);
 278 SYSFS_PMCSETUP(tsr2, SPRN_PA6T_TSR2);
 279 SYSFS_PMCSETUP(tsr3, SPRN_PA6T_TSR3);
 280 #endif /* CONFIG_DEBUG_KERNEL */
 281 #endif /* HAS_PPC_PMC_PA6T */
 282
 283 #ifdef HAS_PPC_PMC_IBM
 284 static struct device_attribute ibm_common_attrs[] = {
 285         __ATTR(mmcr0, 0600, show_mmcr0, store_mmcr0),
 286         __ATTR(mmcr1, 0600, show_mmcr1, store_mmcr1),
 287 };
 288 #endif /* HAS_PPC_PMC_G4 */
 289
 290 #ifdef HAS_PPC_PMC_G4
 291 static struct device_attribute g4_common_attrs[] = {
 292         __ATTR(mmcr0, 0600, show_mmcr0, store_mmcr0),
 293         __ATTR(mmcr1, 0600, show_mmcr1, store_mmcr1),
 294         __ATTR(mmcr2, 0600, show_mmcr2, store_mmcr2),
 295 };
 296 #endif /* HAS_PPC_PMC_G4 */
 297
 298 static struct device_attribute classic_pmc_attrs[] = {
 299         __ATTR(pmc1, 0600, show_pmc1, store_pmc1),
 300         __ATTR(pmc2, 0600, show_pmc2, store_pmc2),
 301         __ATTR(pmc3, 0600, show_pmc3, store_pmc3),
 302         __ATTR(pmc4, 0600, show_pmc4, store_pmc4),
 303         __ATTR(pmc5, 0600, show_pmc5, store_pmc5),
 304         __ATTR(pmc6, 0600, show_pmc6, store_pmc6),
 305 #ifdef CONFIG_PPC64
 306         __ATTR(pmc7, 0600, show_pmc7, store_pmc7),
 307         __ATTR(pmc8, 0600, show_pmc8, store_pmc8),
 308 #endif
 309 };
 310
 311 #ifdef HAS_PPC_PMC_PA6T
 312 static struct device_attribute pa6t_attrs[] = {
 313         __ATTR(mmcr0, 0600, show_mmcr0, store_mmcr0),
 314         __ATTR(mmcr1, 0600, show_mmcr1, store_mmcr1),
 315         __ATTR(pmc0, 0600, show_pa6t_pmc0, store_pa6t_pmc0),
 316         __ATTR(pmc1, 0600, show_pa6t_pmc1, store_pa6t_pmc1),
 317         __ATTR(pmc2, 0600, show_pa6t_pmc2, store_pa6t_pmc2),
 318         __ATTR(pmc3, 0600, show_pa6t_pmc3, store_pa6t_pmc3),
 319         __ATTR(pmc4, 0600, show_pa6t_pmc4, store_pa6t_pmc4),
 320         __ATTR(pmc5, 0600, show_pa6t_pmc5, store_pa6t_pmc5),
 321 #ifdef CONFIG_DEBUG_KERNEL
 322         __ATTR(hid0, 0600, show_hid0, store_hid0),
 323         __ATTR(hid1, 0600, show_hid1, store_hid1),
 324         __ATTR(hid4, 0600, show_hid4, store_hid4),
 325         __ATTR(hid5, 0600, show_hid5, store_hid5),
 326         __ATTR(ima0, 0600, show_ima0, store_ima0),
 327         __ATTR(ima1, 0600, show_ima1, store_ima1),
 328         __ATTR(ima2, 0600, show_ima2, store_ima2),
 329         __ATTR(ima3, 0600, show_ima3, store_ima3),
 330         __ATTR(ima4, 0600, show_ima4, store_ima4),
 331         __ATTR(ima5, 0600, show_ima5, store_ima5),
 332         __ATTR(ima6, 0600, show_ima6, store_ima6),
 333         __ATTR(ima7, 0600, show_ima7, store_ima7),
 334         __ATTR(ima8, 0600, show_ima8, store_ima8),
 335         __ATTR(ima9, 0600, show_ima9, store_ima9),
 336         __ATTR(imaat, 0600, show_imaat, store_imaat),
 337         __ATTR(btcr, 0600, show_btcr, store_btcr),
 338         __ATTR(pccr, 0600, show_pccr, store_pccr),
 339         __ATTR(rpccr, 0600, show_rpccr, store_rpccr),
 340         __ATTR(der, 0600, show_der, store_der),
 341         __ATTR(mer, 0600, show_mer, store_mer),
 342         __ATTR(ber, 0600, show_ber, store_ber),
 343         __ATTR(ier, 0600, show_ier, store_ier),
 344         __ATTR(sier, 0600, show_sier, store_sier),
 345         __ATTR(siar, 0600, show_siar, store_siar),
 346         __ATTR(tsr0, 0600, show_tsr0, store_tsr0),
 347         __ATTR(tsr1, 0600, show_tsr1, store_tsr1),
 348         __ATTR(tsr2, 0600, show_tsr2, store_tsr2),
 349         __ATTR(tsr3, 0600, show_tsr3, store_tsr3),
 350 #endif /* CONFIG_DEBUG_KERNEL */
 351 };
 352 #endif /* HAS_PPC_PMC_PA6T */
 353 #endif /* HAS_PPC_PMC_CLASSIC */
 354
 355 static void register_cpu_online(unsigned int cpu)
 356 {
 357         struct cpu *c = &per_cpu(cpu_devices, cpu);
 358         struct device *s = &c->dev;
 359         struct device_attribute *attrs, *pmc_attrs;
 360         int i, nattrs;
 361
 362 #ifdef CONFIG_PPC64
 363         if (cpu_has_feature(CPU_FTR_SMT))
 364                 device_create_file(s, &dev_attr_smt_snooze_delay);
 365 #endif
 366
 367         /* PMC stuff */
 368         switch (cur_cpu_spec->pmc_type) {
 369 #ifdef HAS_PPC_PMC_IBM
 370         case PPC_PMC_IBM:
 371                 attrs = ibm_common_attrs;
 372                 nattrs = sizeof(ibm_common_attrs) / sizeof(struct device_attribute);
 373                 pmc_attrs = classic_pmc_attrs;
 374                 break;
 375 #endif /* HAS_PPC_PMC_IBM */
 376 #ifdef HAS_PPC_PMC_G4
 377         case PPC_PMC_G4:
 378                 attrs = g4_common_attrs;
 379                 nattrs = sizeof(g4_common_attrs) / sizeof(struct device_attribute);
 380                 pmc_attrs = classic_pmc_attrs;
 381                 break;
 382 #endif /* HAS_PPC_PMC_G4 */
 383 #ifdef HAS_PPC_PMC_PA6T
 384         case PPC_PMC_PA6T:
 385                 /* PA Semi starts counting at PMC0 */
 386                 attrs = pa6t_attrs;
 387                 nattrs = sizeof(pa6t_attrs) / sizeof(struct device_attribute);
 388                 pmc_attrs = NULL;
 389                 break;
 390 #endif /* HAS_PPC_PMC_PA6T */
 391         default:
 392                 attrs = NULL;
 393                 nattrs = 0;
 394                 pmc_attrs = NULL;
 395         }
 396
 397         for (i = 0; i < nattrs; i++)
 398                 device_create_file(s, &attrs[i]);
 399
 400         if (pmc_attrs)
 401                 for (i = 0; i < cur_cpu_spec->num_pmcs; i++)
 402                         device_create_file(s, &pmc_attrs[i]);
 403
 404 #ifdef CONFIG_PPC64
 405         if (cpu_has_feature(CPU_FTR_MMCRA))
 406                 device_create_file(s, &dev_attr_mmcra);
 407
 408         if (cpu_has_feature(CPU_FTR_PURR)) {
 409                 if (!firmware_has_feature(FW_FEATURE_LPAR))
 410                         add_write_permission_dev_attr(&dev_attr_purr);
 411                 device_create_file(s, &dev_attr_purr);
 412         }
 413
 414         if (cpu_has_feature(CPU_FTR_SPURR))
 415                 device_create_file(s, &dev_attr_spurr);
 416
 417         if (cpu_has_feature(CPU_FTR_DSCR))
 418                 device_create_file(s, &dev_attr_dscr);
 419
 420         if (cpu_has_feature(CPU_FTR_PPCAS_ARCH_V2))
 421                 device_create_file(s, &dev_attr_pir);
 422 #endif /* CONFIG_PPC64 */
 423
 424         cacheinfo_cpu_online(cpu);
 425 }
 426
 427 #ifdef CONFIG_HOTPLUG_CPU
 428 static void unregister_cpu_online(unsigned int cpu)
 429 {
 430         struct cpu *c = &per_cpu(cpu_devices, cpu);
 431         struct device *s = &c->dev;
 432         struct device_attribute *attrs, *pmc_attrs;
 433         int i, nattrs;
 434
 435         BUG_ON(!c->hotpluggable);
 436
 437 #ifdef CONFIG_PPC64
 438         if (cpu_has_feature(CPU_FTR_SMT))
 439                 device_remove_file(s, &dev_attr_smt_snooze_delay);
 440 #endif
 441
 442         /* PMC stuff */
 443         switch (cur_cpu_spec->pmc_type) {
 444 #ifdef HAS_PPC_PMC_IBM
 445         case PPC_PMC_IBM:
 446                 attrs = ibm_common_attrs;
 447                 nattrs = sizeof(ibm_common_attrs) / sizeof(struct device_attribute);
 448                 pmc_attrs = classic_pmc_attrs;
 449                 break;
 450 #endif /* HAS_PPC_PMC_IBM */
 451 #ifdef HAS_PPC_PMC_G4
 452         case PPC_PMC_G4:
 453                 attrs = g4_common_attrs;
 454                 nattrs = sizeof(g4_common_attrs) / sizeof(struct device_attribute);
 455                 pmc_attrs = classic_pmc_attrs;
 456                 break;
 457 #endif /* HAS_PPC_PMC_G4 */
 458 #ifdef HAS_PPC_PMC_PA6T
 459         case PPC_PMC_PA6T:
 460                 /* PA Semi starts counting at PMC0 */
 461                 attrs = pa6t_attrs;
 462                 nattrs = sizeof(pa6t_attrs) / sizeof(struct device_attribute);
 463                 pmc_attrs = NULL;
 464                 break;
 465 #endif /* HAS_PPC_PMC_PA6T */
 466         default:
 467                 attrs = NULL;
 468                 nattrs = 0;
 469                 pmc_attrs = NULL;
 470         }
 471
 472         for (i = 0; i < nattrs; i++)
 473                 device_remove_file(s, &attrs[i]);
 474
 475         if (pmc_attrs)
 476                 for (i = 0; i < cur_cpu_spec->num_pmcs; i++)
 477                         device_remove_file(s, &pmc_attrs[i]);
 478
 479 #ifdef CONFIG_PPC64
 480         if (cpu_has_feature(CPU_FTR_MMCRA))
 481                 device_remove_file(s, &dev_attr_mmcra);
 482
 483         if (cpu_has_feature(CPU_FTR_PURR))
 484                 device_remove_file(s, &dev_attr_purr);
 485
 486         if (cpu_has_feature(CPU_FTR_SPURR))
 487                 device_remove_file(s, &dev_attr_spurr);
 488
 489         if (cpu_has_feature(CPU_FTR_DSCR))
 490                 device_remove_file(s, &dev_attr_dscr);
 491
 492         if (cpu_has_feature(CPU_FTR_PPCAS_ARCH_V2))
 493                 device_remove_file(s, &dev_attr_pir);
 494 #endif /* CONFIG_PPC64 */
 495
 496         cacheinfo_cpu_offline(cpu);
 497 }
 498
 499 #ifdef CONFIG_ARCH_CPU_PROBE_RELEASE
 500 ssize_t arch_cpu_probe(const char *buf, size_t count)
 501 {
 502         if (ppc_md.cpu_probe)
 503                 return ppc_md.cpu_probe(buf, count);
 504
 505         return -EINVAL;
 506 }
 507
 508 ssize_t arch_cpu_release(const char *buf, size_t count)
 509 {
 510         if (ppc_md.cpu_release)
 511                 return ppc_md.cpu_release(buf, count);
 512
 513         return -EINVAL;
 514 }
 515 #endif /* CONFIG_ARCH_CPU_PROBE_RELEASE */
 516
 517 #endif /* CONFIG_HOTPLUG_CPU */
 518
 519 static int sysfs_cpu_notify(struct notifier_block *self,
 520                                       unsigned long action, void *hcpu)
 521 {
 522         unsigned int cpu = (unsigned int)(long)hcpu;
 523
 524         switch (action) {
 525         case CPU_ONLINE:
 526         case CPU_ONLINE_FROZEN:
 527                 register_cpu_online(cpu);
 528                 break;
 529 #ifdef CONFIG_HOTPLUG_CPU
 530         case CPU_DEAD:
 531         case CPU_DEAD_FROZEN:
 532                 unregister_cpu_online(cpu);
 533                 break;
 534 #endif
 535         }
 536         return NOTIFY_OK;
 537 }
 538
 539 static struct notifier_block sysfs_cpu_nb = {
 540         .notifier_call  = sysfs_cpu_notify,
 541 };
 542
 543 static DEFINE_MUTEX(cpu_mutex);
 544
 545 int cpu_add_dev_attr(struct device_attribute *attr)
 546 {
 547         int cpu;
 548
 549         mutex_lock(&cpu_mutex);
 550
 551         for_each_possible_cpu(cpu) {
 552                 device_create_file(get_cpu_device(cpu), attr);
 553         }
 554
 555         mutex_unlock(&cpu_mutex);
 556         return 0;
 557 }
 558 EXPORT_SYMBOL_GPL(cpu_add_dev_attr);
 559
 560 int cpu_add_dev_attr_group(struct attribute_group *attrs)
 561 {
 562         int cpu;
 563         struct device *dev;
 564         int ret;
 565
 566         mutex_lock(&cpu_mutex);
 567
 568         for_each_possible_cpu(cpu) {
 569                 dev = get_cpu_device(cpu);
 570                 ret = sysfs_create_group(&dev->kobj, attrs);
 571                 WARN_ON(ret != 0);
 572         }
 573
 574         mutex_unlock(&cpu_mutex);
 575         return 0;
 576 }
 577 EXPORT_SYMBOL_GPL(cpu_add_dev_attr_group);
 578
 579
 580 void cpu_remove_dev_attr(struct device_attribute *attr)
 581 {
 582         int cpu;
 583
 584         mutex_lock(&cpu_mutex);
 585
 586         for_each_possible_cpu(cpu) {
 587                 device_remove_file(get_cpu_device(cpu), attr);
 588         }
 589
 590         mutex_unlock(&cpu_mutex);
 591 }
 592 EXPORT_SYMBOL_GPL(cpu_remove_dev_attr);
 593
 594 void cpu_remove_dev_attr_group(struct attribute_group *attrs)
 595 {
 596         int cpu;
 597         struct device *dev;
 598
 599         mutex_lock(&cpu_mutex);
 600
 601         for_each_possible_cpu(cpu) {
 602                 dev = get_cpu_device(cpu);
 603                 sysfs_remove_group(&dev->kobj, attrs);
 604         }
 605
 606         mutex_unlock(&cpu_mutex);
 607 }
 608 EXPORT_SYMBOL_GPL(cpu_remove_dev_attr_group);
 609
 610
 611 /* NUMA stuff */
 612
 613 #ifdef CONFIG_NUMA
 614 static void register_nodes(void)
 615 {
 616         int i;
 617
 618         for (i = 0; i < MAX_NUMNODES; i++)
 619                 register_one_node(i);
 620 }
 621
 622 int sysfs_add_device_to_node(struct device *dev, int nid)
 623 {
 624         struct node *node = node_devices[nid];
 625         return sysfs_create_link(&node->dev.kobj, &dev->kobj,
 626                         kobject_name(&dev->kobj));
 627 }
 628 EXPORT_SYMBOL_GPL(sysfs_add_device_to_node);
 629
 630 void sysfs_remove_device_from_node(struct device *dev, int nid)
 631 {
 632         struct node *node = node_devices[nid];
 633         sysfs_remove_link(&node->dev.kobj, kobject_name(&dev->kobj));
 634 }
 635 EXPORT_SYMBOL_GPL(sysfs_remove_device_from_node);
 636
 637 #else
 638 static void register_nodes(void)
 639 {
 640         return;
 641 }
 642
 643 #endif
 644
 645 /* Only valid if CPU is present. */
 646 static ssize_t show_physical_id(struct device *dev,
 647                                 struct device_attribute *attr, char *buf)
 648 {
 649         struct cpu *cpu = container_of(dev, struct cpu, dev);
 650
 651         return sprintf(buf, "%d\n", get_hard_smp_processor_id(cpu->dev.id));
 652 }
 653 static DEVICE_ATTR(physical_id, 0444, show_physical_id, NULL);
 654
 655 static int __init topology_init(void)
 656 {
 657         int cpu;
 658
 659         register_nodes();
 660         register_cpu_notifier(&sysfs_cpu_nb);
 661
 662         for_each_possible_cpu(cpu) {
 663                 struct cpu *c = &per_cpu(cpu_devices, cpu);
 664
 665                 /*
 666                  * For now, we just see if the system supports making
 667                  * the RTAS calls for CPU hotplug.  But, there may be a
 668                  * more comprehensive way to do this for an individual
 669                  * CPU.  For instance, the boot cpu might never be valid
 670                  * for hotplugging.
 671                  */
 672                 if (ppc_md.cpu_die)
 673                         c->hotpluggable = 1;
 674
 675                 if (cpu_online(cpu) || c->hotpluggable) {
 676                         register_cpu(c, cpu);
 677
 678                         device_create_file(&c->dev, &dev_attr_physical_id);
 679                 }
 680
 681                 if (cpu_online(cpu))
 682                         register_cpu_online(cpu);
 683         }
 684 #ifdef CONFIG_PPC64
 685         sysfs_create_dscr_default();
 686 #endif /* CONFIG_PPC64 */
 687
 688         return 0;
 689 }
 690 subsys_initcall(topology_init);