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