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