arch/powerpc/kernel/sysfs.c

   1 #include <linux/sysdev.h>
   2 #include <linux/cpu.h>
   3 #include <linux/smp.h>
   4 #include <linux/percpu.h>
   5 #include <linux/init.h>
   6 #include <linux/sched.h>
   7 #include <linux/module.h>
   8 #include <linux/nodemask.h>
   9 #include <linux/cpumask.h>
  10 #include <linux/notifier.h>
  11
  12 #include <asm/current.h>
  13 #include <asm/processor.h>
  14 #include <asm/cputable.h>
  15 #include <asm/firmware.h>
  16 #include <asm/hvcall.h>
  17 #include <asm/prom.h>
  18 #include <asm/paca.h>
  19 #include <asm/lppaca.h>
  20 #include <asm/machdep.h>
  21 #include <asm/smp.h>
  22
  23 static DEFINE_PER_CPU(struct cpu, cpu_devices);
  24
  25 static DEFINE_PER_CPU(struct kobject *, cache_toplevel);
  26
  27 /* SMT stuff */
  28
  29 #ifdef CONFIG_PPC_MULTIPLATFORM
  30 /* Time in microseconds we delay before sleeping in the idle loop */
  31 DEFINE_PER_CPU(unsigned long, smt_snooze_delay) = { 100 };
  32
  33 static ssize_t store_smt_snooze_delay(struct sys_device *dev,
  34                                       struct sysdev_attribute *attr,
  35                                       const char *buf,
  36                                       size_t count)
  37 {
  38         struct cpu *cpu = container_of(dev, struct cpu, sysdev);
  39         ssize_t ret;
  40         unsigned long snooze;
  41
  42         ret = sscanf(buf, "%lu", &snooze);
  43         if (ret != 1)
  44                 return -EINVAL;
  45
  46         per_cpu(smt_snooze_delay, cpu->sysdev.id) = snooze;
  47
  48         return count;
  49 }
  50
  51 static ssize_t show_smt_snooze_delay(struct sys_device *dev,
  52                                      struct sysdev_attribute *attr,
  53                                      char *buf)
  54 {
  55         struct cpu *cpu = container_of(dev, struct cpu, sysdev);
  56
  57         return sprintf(buf, "%lu\n", per_cpu(smt_snooze_delay, cpu->sysdev.id));
  58 }
  59
  60 static SYSDEV_ATTR(smt_snooze_delay, 0644, show_smt_snooze_delay,
  61                    store_smt_snooze_delay);
  62
  63 /* Only parse OF options if the matching cmdline option was not specified */
  64 static int smt_snooze_cmdline;
  65
  66 static int __init smt_setup(void)
  67 {
  68         struct device_node *options;
  69         const unsigned int *val;
  70         unsigned int cpu;
  71
  72         if (!cpu_has_feature(CPU_FTR_SMT))
  73                 return -ENODEV;
  74
  75         options = of_find_node_by_path("/options");
  76         if (!options)
  77                 return -ENODEV;
  78
  79         val = of_get_property(options, "ibm,smt-snooze-delay", NULL);
  80         if (!smt_snooze_cmdline && val) {
  81                 for_each_possible_cpu(cpu)
  82                         per_cpu(smt_snooze_delay, cpu) = *val;
  83         }
  84
  85         of_node_put(options);
  86         return 0;
  87 }
  88 __initcall(smt_setup);
  89
  90 static int __init setup_smt_snooze_delay(char *str)
  91 {
  92         unsigned int cpu;
  93         int snooze;
  94
  95         if (!cpu_has_feature(CPU_FTR_SMT))
  96                 return 1;
  97
  98         smt_snooze_cmdline = 1;
  99
 100         if (get_option(&str, &snooze)) {
 101                 for_each_possible_cpu(cpu)
 102                         per_cpu(smt_snooze_delay, cpu) = snooze;
 103         }
 104
 105         return 1;
 106 }
 107 __setup("smt-snooze-delay=", setup_smt_snooze_delay);
 108
 109 #endif /* CONFIG_PPC_MULTIPLATFORM */
 110
 111 /*
 112  * Enabling PMCs will slow partition context switch times so we only do
 113  * it the first time we write to the PMCs.
 114  */
 115
 116 static DEFINE_PER_CPU(char, pmcs_enabled);
 117
 118 void ppc64_enable_pmcs(void)
 119 {
 120         /* Only need to enable them once */
 121         if (__get_cpu_var(pmcs_enabled))
 122                 return;
 123
 124         __get_cpu_var(pmcs_enabled) = 1;
 125
 126         if (ppc_md.enable_pmcs)
 127                 ppc_md.enable_pmcs();
 128 }
 129 EXPORT_SYMBOL(ppc64_enable_pmcs);
 130
 131 /* XXX convert to rusty's on_one_cpu */
 132 static unsigned long run_on_cpu(unsigned long cpu,
 133                                 unsigned long (*func)(unsigned long),
 134                                 unsigned long arg)
 135 {
 136         cpumask_t old_affinity = current->cpus_allowed;
 137         unsigned long ret;
 138
 139         /* should return -EINVAL to userspace */
 140         if (set_cpus_allowed(current, cpumask_of_cpu(cpu)))
 141                 return 0;
 142
 143         ret = func(arg);
 144
 145         set_cpus_allowed(current, old_affinity);
 146
 147         return ret;
 148 }
 149
 150 #define SYSFS_PMCSETUP(NAME, ADDRESS) \
 151 static unsigned long read_##NAME(unsigned long junk) \
 152 { \
 153         return mfspr(ADDRESS); \
 154 } \
 155 static unsigned long write_##NAME(unsigned long val) \
 156 { \
 157         ppc64_enable_pmcs(); \
 158         mtspr(ADDRESS, val); \
 159         return 0; \
 160 } \
 161 static ssize_t show_##NAME(struct sys_device *dev, \
 162                         struct sysdev_attribute *attr, \
 163                         char *buf) \
 164 { \
 165         struct cpu *cpu = container_of(dev, struct cpu, sysdev); \
 166         unsigned long val = run_on_cpu(cpu->sysdev.id, read_##NAME, 0); \
 167         return sprintf(buf, "%lx\n", val); \
 168 } \
 169 static ssize_t __used \
 170         store_##NAME(struct sys_device *dev, struct sysdev_attribute *attr, \
 171                         const char *buf, size_t count) \
 172 { \
 173         struct cpu *cpu = container_of(dev, struct cpu, sysdev); \
 174         unsigned long val; \
 175         int ret = sscanf(buf, "%lx", &val); \
 176         if (ret != 1) \
 177                 return -EINVAL; \
 178         run_on_cpu(cpu->sysdev.id, write_##NAME, val); \
 179         return count; \
 180 }
 181
 182
 183 /* Let's define all possible registers, we'll only hook up the ones
 184  * that are implemented on the current processor
 185  */
 186
 187 SYSFS_PMCSETUP(mmcr0, SPRN_MMCR0);
 188 SYSFS_PMCSETUP(mmcr1, SPRN_MMCR1);
 189 SYSFS_PMCSETUP(mmcra, SPRN_MMCRA);
 190 SYSFS_PMCSETUP(pmc1, SPRN_PMC1);
 191 SYSFS_PMCSETUP(pmc2, SPRN_PMC2);
 192 SYSFS_PMCSETUP(pmc3, SPRN_PMC3);
 193 SYSFS_PMCSETUP(pmc4, SPRN_PMC4);
 194 SYSFS_PMCSETUP(pmc5, SPRN_PMC5);
 195 SYSFS_PMCSETUP(pmc6, SPRN_PMC6);
 196 SYSFS_PMCSETUP(pmc7, SPRN_PMC7);
 197 SYSFS_PMCSETUP(pmc8, SPRN_PMC8);
 198 SYSFS_PMCSETUP(purr, SPRN_PURR);
 199 SYSFS_PMCSETUP(spurr, SPRN_SPURR);
 200 SYSFS_PMCSETUP(dscr, SPRN_DSCR);
 201
 202 SYSFS_PMCSETUP(pa6t_pmc0, SPRN_PA6T_PMC0);
 203 SYSFS_PMCSETUP(pa6t_pmc1, SPRN_PA6T_PMC1);
 204 SYSFS_PMCSETUP(pa6t_pmc2, SPRN_PA6T_PMC2);
 205 SYSFS_PMCSETUP(pa6t_pmc3, SPRN_PA6T_PMC3);
 206 SYSFS_PMCSETUP(pa6t_pmc4, SPRN_PA6T_PMC4);
 207 SYSFS_PMCSETUP(pa6t_pmc5, SPRN_PA6T_PMC5);
 208
 209 #ifdef CONFIG_DEBUG_KERNEL
 210 SYSFS_PMCSETUP(hid0, SPRN_HID0);
 211 SYSFS_PMCSETUP(hid1, SPRN_HID1);
 212 SYSFS_PMCSETUP(hid4, SPRN_HID4);
 213 SYSFS_PMCSETUP(hid5, SPRN_HID5);
 214 SYSFS_PMCSETUP(ima0, SPRN_PA6T_IMA0);
 215 SYSFS_PMCSETUP(ima1, SPRN_PA6T_IMA1);
 216 SYSFS_PMCSETUP(ima2, SPRN_PA6T_IMA2);
 217 SYSFS_PMCSETUP(ima3, SPRN_PA6T_IMA3);
 218 SYSFS_PMCSETUP(ima4, SPRN_PA6T_IMA4);
 219 SYSFS_PMCSETUP(ima5, SPRN_PA6T_IMA5);
 220 SYSFS_PMCSETUP(ima6, SPRN_PA6T_IMA6);
 221 SYSFS_PMCSETUP(ima7, SPRN_PA6T_IMA7);
 222 SYSFS_PMCSETUP(ima8, SPRN_PA6T_IMA8);
 223 SYSFS_PMCSETUP(ima9, SPRN_PA6T_IMA9);
 224 SYSFS_PMCSETUP(imaat, SPRN_PA6T_IMAAT);
 225 SYSFS_PMCSETUP(btcr, SPRN_PA6T_BTCR);
 226 SYSFS_PMCSETUP(pccr, SPRN_PA6T_PCCR);
 227 SYSFS_PMCSETUP(rpccr, SPRN_PA6T_RPCCR);
 228 SYSFS_PMCSETUP(der, SPRN_PA6T_DER);
 229 SYSFS_PMCSETUP(mer, SPRN_PA6T_MER);
 230 SYSFS_PMCSETUP(ber, SPRN_PA6T_BER);
 231 SYSFS_PMCSETUP(ier, SPRN_PA6T_IER);
 232 SYSFS_PMCSETUP(sier, SPRN_PA6T_SIER);
 233 SYSFS_PMCSETUP(siar, SPRN_PA6T_SIAR);
 234 SYSFS_PMCSETUP(tsr0, SPRN_PA6T_TSR0);
 235 SYSFS_PMCSETUP(tsr1, SPRN_PA6T_TSR1);
 236 SYSFS_PMCSETUP(tsr2, SPRN_PA6T_TSR2);
 237 SYSFS_PMCSETUP(tsr3, SPRN_PA6T_TSR3);
 238 #endif /* CONFIG_DEBUG_KERNEL */
 239
 240 static SYSDEV_ATTR(mmcra, 0600, show_mmcra, store_mmcra);
 241 static SYSDEV_ATTR(spurr, 0600, show_spurr, NULL);
 242 static SYSDEV_ATTR(dscr, 0600, show_dscr, store_dscr);
 243 static SYSDEV_ATTR(purr, 0600, show_purr, store_purr);
 244
 245 static struct sysdev_attribute ibm_common_attrs[] = {
 246         _SYSDEV_ATTR(mmcr0, 0600, show_mmcr0, store_mmcr0),
 247         _SYSDEV_ATTR(mmcr1, 0600, show_mmcr1, store_mmcr1),
 248 };
 249
 250 static struct sysdev_attribute ibm_pmc_attrs[] = {
 251         _SYSDEV_ATTR(pmc1, 0600, show_pmc1, store_pmc1),
 252         _SYSDEV_ATTR(pmc2, 0600, show_pmc2, store_pmc2),
 253         _SYSDEV_ATTR(pmc3, 0600, show_pmc3, store_pmc3),
 254         _SYSDEV_ATTR(pmc4, 0600, show_pmc4, store_pmc4),
 255         _SYSDEV_ATTR(pmc5, 0600, show_pmc5, store_pmc5),
 256         _SYSDEV_ATTR(pmc6, 0600, show_pmc6, store_pmc6),
 257         _SYSDEV_ATTR(pmc7, 0600, show_pmc7, store_pmc7),
 258         _SYSDEV_ATTR(pmc8, 0600, show_pmc8, store_pmc8),
 259 };
 260
 261 static struct sysdev_attribute pa6t_attrs[] = {
 262         _SYSDEV_ATTR(mmcr0, 0600, show_mmcr0, store_mmcr0),
 263         _SYSDEV_ATTR(mmcr1, 0600, show_mmcr1, store_mmcr1),
 264         _SYSDEV_ATTR(pmc0, 0600, show_pa6t_pmc0, store_pa6t_pmc0),
 265         _SYSDEV_ATTR(pmc1, 0600, show_pa6t_pmc1, store_pa6t_pmc1),
 266         _SYSDEV_ATTR(pmc2, 0600, show_pa6t_pmc2, store_pa6t_pmc2),
 267         _SYSDEV_ATTR(pmc3, 0600, show_pa6t_pmc3, store_pa6t_pmc3),
 268         _SYSDEV_ATTR(pmc4, 0600, show_pa6t_pmc4, store_pa6t_pmc4),
 269         _SYSDEV_ATTR(pmc5, 0600, show_pa6t_pmc5, store_pa6t_pmc5),
 270 #ifdef CONFIG_DEBUG_KERNEL
 271         _SYSDEV_ATTR(hid0, 0600, show_hid0, store_hid0),
 272         _SYSDEV_ATTR(hid1, 0600, show_hid1, store_hid1),
 273         _SYSDEV_ATTR(hid4, 0600, show_hid4, store_hid4),
 274         _SYSDEV_ATTR(hid5, 0600, show_hid5, store_hid5),
 275         _SYSDEV_ATTR(ima0, 0600, show_ima0, store_ima0),
 276         _SYSDEV_ATTR(ima1, 0600, show_ima1, store_ima1),
 277         _SYSDEV_ATTR(ima2, 0600, show_ima2, store_ima2),
 278         _SYSDEV_ATTR(ima3, 0600, show_ima3, store_ima3),
 279         _SYSDEV_ATTR(ima4, 0600, show_ima4, store_ima4),
 280         _SYSDEV_ATTR(ima5, 0600, show_ima5, store_ima5),
 281         _SYSDEV_ATTR(ima6, 0600, show_ima6, store_ima6),
 282         _SYSDEV_ATTR(ima7, 0600, show_ima7, store_ima7),
 283         _SYSDEV_ATTR(ima8, 0600, show_ima8, store_ima8),
 284         _SYSDEV_ATTR(ima9, 0600, show_ima9, store_ima9),
 285         _SYSDEV_ATTR(imaat, 0600, show_imaat, store_imaat),
 286         _SYSDEV_ATTR(btcr, 0600, show_btcr, store_btcr),
 287         _SYSDEV_ATTR(pccr, 0600, show_pccr, store_pccr),
 288         _SYSDEV_ATTR(rpccr, 0600, show_rpccr, store_rpccr),
 289         _SYSDEV_ATTR(der, 0600, show_der, store_der),
 290         _SYSDEV_ATTR(mer, 0600, show_mer, store_mer),
 291         _SYSDEV_ATTR(ber, 0600, show_ber, store_ber),
 292         _SYSDEV_ATTR(ier, 0600, show_ier, store_ier),
 293         _SYSDEV_ATTR(sier, 0600, show_sier, store_sier),
 294         _SYSDEV_ATTR(siar, 0600, show_siar, store_siar),
 295         _SYSDEV_ATTR(tsr0, 0600, show_tsr0, store_tsr0),
 296         _SYSDEV_ATTR(tsr1, 0600, show_tsr1, store_tsr1),
 297         _SYSDEV_ATTR(tsr2, 0600, show_tsr2, store_tsr2),
 298         _SYSDEV_ATTR(tsr3, 0600, show_tsr3, store_tsr3),
 299 #endif /* CONFIG_DEBUG_KERNEL */
 300 };
 301
 302 struct cache_desc {
 303         struct kobject kobj;
 304         struct cache_desc *next;
 305         const char *type;       /* Instruction, Data, or Unified */
 306         u32 size;               /* total cache size in KB */
 307         u32 line_size;          /* in bytes */
 308         u32 nr_sets;            /* number of sets */
 309         u32 level;              /* e.g. 1, 2, 3... */
 310         u32 associativity;      /* e.g. 8-way... 0 is fully associative */
 311 };
 312
 313 DEFINE_PER_CPU(struct cache_desc *, cache_desc);
 314
 315 static struct cache_desc *kobj_to_cache_desc(struct kobject *k)
 316 {
 317         return container_of(k, struct cache_desc, kobj);
 318 }
 319
 320 static void cache_desc_release(struct kobject *k)
 321 {
 322         struct cache_desc *desc = kobj_to_cache_desc(k);
 323
 324         pr_debug("%s: releasing %s\n", __func__, kobject_name(k));
 325
 326         if (desc->next)
 327                 kobject_put(&desc->next->kobj);
 328
 329         kfree(kobj_to_cache_desc(k));
 330 }
 331
 332 static ssize_t cache_desc_show(struct kobject *k, struct attribute *attr, char *buf)
 333 {
 334         struct kobj_attribute *kobj_attr;
 335
 336         kobj_attr = container_of(attr, struct kobj_attribute, attr);
 337
 338         return kobj_attr->show(k, kobj_attr, buf);
 339 }
 340
 341 static struct sysfs_ops cache_desc_sysfs_ops = {
 342         .show = cache_desc_show,
 343 };
 344
 345 static struct kobj_type cache_desc_type = {
 346         .release = cache_desc_release,
 347         .sysfs_ops = &cache_desc_sysfs_ops,
 348 };
 349
 350 static ssize_t cache_size_show(struct kobject *k, struct kobj_attribute *attr, char *buf)
 351 {
 352         struct cache_desc *cache = kobj_to_cache_desc(k);
 353
 354         return sprintf(buf, "%uK\n", cache->size);
 355 }
 356
 357 static struct kobj_attribute cache_size_attr =
 358         __ATTR(size, 0444, cache_size_show, NULL);
 359
 360 static ssize_t cache_line_size_show(struct kobject *k, struct kobj_attribute *attr, char *buf)
 361 {
 362         struct cache_desc *cache = kobj_to_cache_desc(k);
 363
 364         return sprintf(buf, "%u\n", cache->line_size);
 365 }
 366
 367 static struct kobj_attribute cache_line_size_attr =
 368         __ATTR(coherency_line_size, 0444, cache_line_size_show, NULL);
 369
 370 static ssize_t cache_nr_sets_show(struct kobject *k, struct kobj_attribute *attr, char *buf)
 371 {
 372         struct cache_desc *cache = kobj_to_cache_desc(k);
 373
 374         return sprintf(buf, "%u\n", cache->nr_sets);
 375 }
 376
 377 static struct kobj_attribute cache_nr_sets_attr =
 378         __ATTR(number_of_sets, 0444, cache_nr_sets_show, NULL);
 379
 380 static ssize_t cache_type_show(struct kobject *k, struct kobj_attribute *attr, char *buf)
 381 {
 382         struct cache_desc *cache = kobj_to_cache_desc(k);
 383
 384         return sprintf(buf, "%s\n", cache->type);
 385 }
 386
 387 static struct kobj_attribute cache_type_attr =
 388         __ATTR(type, 0444, cache_type_show, NULL);
 389
 390 static ssize_t cache_level_show(struct kobject *k, struct kobj_attribute *attr, char *buf)
 391 {
 392         struct cache_desc *cache = kobj_to_cache_desc(k);
 393
 394         return sprintf(buf, "%u\n", cache->level);
 395 }
 396
 397 static struct kobj_attribute cache_level_attr =
 398         __ATTR(level, 0444, cache_level_show, NULL);
 399
 400 static ssize_t cache_assoc_show(struct kobject *k, struct kobj_attribute *attr, char *buf)
 401 {
 402         struct cache_desc *cache = kobj_to_cache_desc(k);
 403
 404         return sprintf(buf, "%u\n", cache->associativity);
 405 }
 406
 407 static struct kobj_attribute cache_assoc_attr =
 408         __ATTR(ways_of_associativity, 0444, cache_assoc_show, NULL);
 409
 410 struct cache_desc_info {
 411         const char *type;
 412         const char *size_prop;
 413         const char *line_size_prop;
 414         const char *nr_sets_prop;
 415 };
 416
 417 /* PowerPC Processor binding says the [di]-cache-* must be equal on
 418  * unified caches, so just use d-cache properties. */
 419 static struct cache_desc_info ucache_info = {
 420         .type = "Unified",
 421         .size_prop = "d-cache-size",
 422         .line_size_prop = "d-cache-line-size",
 423         .nr_sets_prop = "d-cache-sets",
 424 };
 425
 426 static struct cache_desc_info dcache_info = {
 427         .type = "Data",
 428         .size_prop = "d-cache-size",
 429         .line_size_prop = "d-cache-line-size",
 430         .nr_sets_prop = "d-cache-sets",
 431 };
 432
 433 static struct cache_desc_info icache_info = {
 434         .type = "Instruction",
 435         .size_prop = "i-cache-size",
 436         .line_size_prop = "i-cache-line-size",
 437         .nr_sets_prop = "i-cache-sets",
 438 };
 439
 440 static struct cache_desc * __cpuinit create_cache_desc(struct device_node *np, struct kobject *parent, int index, int level, struct cache_desc_info *info)
 441 {
 442         const u32 *cache_line_size;
 443         struct cache_desc *new;
 444         const u32 *cache_size;
 445         const u32 *nr_sets;
 446         int rc;
 447
 448         new = kzalloc(sizeof(*new), GFP_KERNEL);
 449         if (!new)
 450                 return NULL;
 451
 452         rc = kobject_init_and_add(&new->kobj, &cache_desc_type, parent,
 453                                   "index%d", index);
 454         if (rc)
 455                 goto err;
 456
 457         /* type */
 458         new->type = info->type;
 459         rc = sysfs_create_file(&new->kobj, &cache_type_attr.attr);
 460         WARN_ON(rc);
 461
 462         /* level */
 463         new->level = level;
 464         rc = sysfs_create_file(&new->kobj, &cache_level_attr.attr);
 465         WARN_ON(rc);
 466
 467         /* size */
 468         cache_size = of_get_property(np, info->size_prop, NULL);
 469         if (cache_size) {
 470                 new->size = *cache_size / 1024;
 471                 rc = sysfs_create_file(&new->kobj,
 472                                        &cache_size_attr.attr);
 473                 WARN_ON(rc);
 474         }
 475
 476         /* coherency_line_size */
 477         cache_line_size = of_get_property(np, info->line_size_prop, NULL);
 478         if (cache_line_size) {
 479                 new->line_size = *cache_line_size;
 480                 rc = sysfs_create_file(&new->kobj,
 481                                        &cache_line_size_attr.attr);
 482                 WARN_ON(rc);
 483         }
 484
 485         /* number_of_sets */
 486         nr_sets = of_get_property(np, info->nr_sets_prop, NULL);
 487         if (nr_sets) {
 488                 new->nr_sets = *nr_sets;
 489                 rc = sysfs_create_file(&new->kobj,
 490                                        &cache_nr_sets_attr.attr);
 491                 WARN_ON(rc);
 492         }
 493
 494         /* ways_of_associativity */
 495         if (new->nr_sets == 1) {
 496                 /* fully associative */
 497                 new->associativity = 0;
 498                 goto create_assoc;
 499         }
 500
 501         if (new->nr_sets && new->size && new->line_size) {
 502                 /* If we have values for all of these we can derive
 503                  * the associativity. */
 504                 new->associativity =
 505                         ((new->size * 1024) / new->nr_sets) / new->line_size;
 506 create_assoc:
 507                 rc = sysfs_create_file(&new->kobj,
 508                                        &cache_assoc_attr.attr);
 509                 WARN_ON(rc);
 510         }
 511
 512         return new;
 513 err:
 514         kfree(new);
 515         return NULL;
 516 }
 517
 518 static bool cache_is_unified(struct device_node *np)
 519 {
 520         return of_get_property(np, "cache-unified", NULL);
 521 }
 522
 523 static struct cache_desc * __cpuinit create_cache_index_info(struct device_node *np, struct kobject *parent, int index, int level)
 524 {
 525         const phandle *next_cache_phandle;
 526         struct device_node *next_cache;
 527         struct cache_desc *new, **end;
 528
 529         pr_debug("%s(node = %s, index = %d)\n", __func__, np->full_name, index);
 530
 531         if (cache_is_unified(np)) {
 532                 new = create_cache_desc(np, parent, index, level,
 533                                         &ucache_info);
 534         } else {
 535                 new = create_cache_desc(np, parent, index, level,
 536                                         &dcache_info);
 537                 if (new) {
 538                         index++;
 539                         new->next = create_cache_desc(np, parent, index, level,
 540                                                       &icache_info);
 541                 }
 542         }
 543         if (!new)
 544                 return NULL;
 545
 546         end = &new->next;
 547         while (*end)
 548                 end = &(*end)->next;
 549
 550         next_cache_phandle = of_get_property(np, "l2-cache", NULL);
 551         if (!next_cache_phandle)
 552                 goto out;
 553
 554         next_cache = of_find_node_by_phandle(*next_cache_phandle);
 555         if (!next_cache)
 556                 goto out;
 557
 558         *end = create_cache_index_info(next_cache, parent, ++index, ++level);
 559
 560         of_node_put(next_cache);
 561 out:
 562         return new;
 563 }
 564
 565 static void __cpuinit create_cache_info(struct sys_device *sysdev)
 566 {
 567         struct kobject *cache_toplevel;
 568         struct device_node *np = NULL;
 569         int cpu = sysdev->id;
 570
 571         cache_toplevel = kobject_create_and_add("cache", &sysdev->kobj);
 572         if (!cache_toplevel)
 573                 return;
 574         per_cpu(cache_toplevel, cpu) = cache_toplevel;
 575         np = of_get_cpu_node(cpu, NULL);
 576         if (np != NULL) {
 577                 per_cpu(cache_desc, cpu) =
 578                         create_cache_index_info(np, cache_toplevel, 0, 1);
 579                 of_node_put(np);
 580         }
 581         return;
 582 }
 583
 584 static void __cpuinit register_cpu_online(unsigned int cpu)
 585 {
 586         struct cpu *c = &per_cpu(cpu_devices, cpu);
 587         struct sys_device *s = &c->sysdev;
 588         struct sysdev_attribute *attrs, *pmc_attrs;
 589         int i, nattrs;
 590
 591         if (!firmware_has_feature(FW_FEATURE_ISERIES) &&
 592                         cpu_has_feature(CPU_FTR_SMT))
 593                 sysdev_create_file(s, &attr_smt_snooze_delay);
 594
 595         /* PMC stuff */
 596         switch (cur_cpu_spec->pmc_type) {
 597         case PPC_PMC_IBM:
 598                 attrs = ibm_common_attrs;
 599                 nattrs = sizeof(ibm_common_attrs) / sizeof(struct sysdev_attribute);
 600                 pmc_attrs = ibm_pmc_attrs;
 601                 break;
 602         case PPC_PMC_PA6T:
 603                 /* PA Semi starts counting at PMC0 */
 604                 attrs = pa6t_attrs;
 605                 nattrs = sizeof(pa6t_attrs) / sizeof(struct sysdev_attribute);
 606                 pmc_attrs = NULL;
 607                 break;
 608         default:
 609                 attrs = NULL;
 610                 nattrs = 0;
 611                 pmc_attrs = NULL;
 612         }
 613
 614         for (i = 0; i < nattrs; i++)
 615                 sysdev_create_file(s, &attrs[i]);
 616
 617         if (pmc_attrs)
 618                 for (i = 0; i < cur_cpu_spec->num_pmcs; i++)
 619                         sysdev_create_file(s, &pmc_attrs[i]);
 620
 621         if (cpu_has_feature(CPU_FTR_MMCRA))
 622                 sysdev_create_file(s, &attr_mmcra);
 623
 624         if (cpu_has_feature(CPU_FTR_PURR))
 625                 sysdev_create_file(s, &attr_purr);
 626
 627         if (cpu_has_feature(CPU_FTR_SPURR))
 628                 sysdev_create_file(s, &attr_spurr);
 629
 630         if (cpu_has_feature(CPU_FTR_DSCR))
 631                 sysdev_create_file(s, &attr_dscr);
 632
 633         create_cache_info(s);
 634 }
 635
 636 #ifdef CONFIG_HOTPLUG_CPU
 637 static void remove_cache_info(struct sys_device *sysdev)
 638 {
 639         struct kobject *cache_toplevel;
 640         struct cache_desc *cache_desc;
 641         int cpu = sysdev->id;
 642
 643         cache_desc = per_cpu(cache_desc, cpu);
 644         if (cache_desc != NULL)
 645                 kobject_put(&cache_desc->kobj);
 646
 647         cache_toplevel = per_cpu(cache_toplevel, cpu);
 648         if (cache_toplevel != NULL)
 649                 kobject_put(cache_toplevel);
 650 }
 651
 652 static void unregister_cpu_online(unsigned int cpu)
 653 {
 654         struct cpu *c = &per_cpu(cpu_devices, cpu);
 655         struct sys_device *s = &c->sysdev;
 656         struct sysdev_attribute *attrs, *pmc_attrs;
 657         int i, nattrs;
 658
 659         BUG_ON(!c->hotpluggable);
 660
 661         if (!firmware_has_feature(FW_FEATURE_ISERIES) &&
 662                         cpu_has_feature(CPU_FTR_SMT))
 663                 sysdev_remove_file(s, &attr_smt_snooze_delay);
 664
 665         /* PMC stuff */
 666         switch (cur_cpu_spec->pmc_type) {
 667         case PPC_PMC_IBM:
 668                 attrs = ibm_common_attrs;
 669                 nattrs = sizeof(ibm_common_attrs) / sizeof(struct sysdev_attribute);
 670                 pmc_attrs = ibm_pmc_attrs;
 671                 break;
 672         case PPC_PMC_PA6T:
 673                 /* PA Semi starts counting at PMC0 */
 674                 attrs = pa6t_attrs;
 675                 nattrs = sizeof(pa6t_attrs) / sizeof(struct sysdev_attribute);
 676                 pmc_attrs = NULL;
 677                 break;
 678         default:
 679                 attrs = NULL;
 680                 nattrs = 0;
 681                 pmc_attrs = NULL;
 682         }
 683
 684         for (i = 0; i < nattrs; i++)
 685                 sysdev_remove_file(s, &attrs[i]);
 686
 687         if (pmc_attrs)
 688                 for (i = 0; i < cur_cpu_spec->num_pmcs; i++)
 689                         sysdev_remove_file(s, &pmc_attrs[i]);
 690
 691         if (cpu_has_feature(CPU_FTR_MMCRA))
 692                 sysdev_remove_file(s, &attr_mmcra);
 693
 694         if (cpu_has_feature(CPU_FTR_PURR))
 695                 sysdev_remove_file(s, &attr_purr);
 696
 697         if (cpu_has_feature(CPU_FTR_SPURR))
 698                 sysdev_remove_file(s, &attr_spurr);
 699
 700         if (cpu_has_feature(CPU_FTR_DSCR))
 701                 sysdev_remove_file(s, &attr_dscr);
 702
 703         remove_cache_info(s);
 704 }
 705 #endif /* CONFIG_HOTPLUG_CPU */
 706
 707 static int __cpuinit sysfs_cpu_notify(struct notifier_block *self,
 708                                       unsigned long action, void *hcpu)
 709 {
 710         unsigned int cpu = (unsigned int)(long)hcpu;
 711
 712         switch (action) {
 713         case CPU_ONLINE:
 714         case CPU_ONLINE_FROZEN:
 715                 register_cpu_online(cpu);
 716                 break;
 717 #ifdef CONFIG_HOTPLUG_CPU
 718         case CPU_DEAD:
 719         case CPU_DEAD_FROZEN:
 720                 unregister_cpu_online(cpu);
 721                 break;
 722 #endif
 723         }
 724         return NOTIFY_OK;
 725 }
 726
 727 static struct notifier_block __cpuinitdata sysfs_cpu_nb = {
 728         .notifier_call  = sysfs_cpu_notify,
 729 };
 730
 731 static DEFINE_MUTEX(cpu_mutex);
 732
 733 int cpu_add_sysdev_attr(struct sysdev_attribute *attr)
 734 {
 735         int cpu;
 736
 737         mutex_lock(&cpu_mutex);
 738
 739         for_each_possible_cpu(cpu) {
 740                 sysdev_create_file(get_cpu_sysdev(cpu), attr);
 741         }
 742
 743         mutex_unlock(&cpu_mutex);
 744         return 0;
 745 }
 746 EXPORT_SYMBOL_GPL(cpu_add_sysdev_attr);
 747
 748 int cpu_add_sysdev_attr_group(struct attribute_group *attrs)
 749 {
 750         int cpu;
 751         struct sys_device *sysdev;
 752         int ret;
 753
 754         mutex_lock(&cpu_mutex);
 755
 756         for_each_possible_cpu(cpu) {
 757                 sysdev = get_cpu_sysdev(cpu);
 758                 ret = sysfs_create_group(&sysdev->kobj, attrs);
 759                 WARN_ON(ret != 0);
 760         }
 761
 762         mutex_unlock(&cpu_mutex);
 763         return 0;
 764 }
 765 EXPORT_SYMBOL_GPL(cpu_add_sysdev_attr_group);
 766
 767
 768 void cpu_remove_sysdev_attr(struct sysdev_attribute *attr)
 769 {
 770         int cpu;
 771
 772         mutex_lock(&cpu_mutex);
 773
 774         for_each_possible_cpu(cpu) {
 775                 sysdev_remove_file(get_cpu_sysdev(cpu), attr);
 776         }
 777
 778         mutex_unlock(&cpu_mutex);
 779 }
 780 EXPORT_SYMBOL_GPL(cpu_remove_sysdev_attr);
 781
 782 void cpu_remove_sysdev_attr_group(struct attribute_group *attrs)
 783 {
 784         int cpu;
 785         struct sys_device *sysdev;
 786
 787         mutex_lock(&cpu_mutex);
 788
 789         for_each_possible_cpu(cpu) {
 790                 sysdev = get_cpu_sysdev(cpu);
 791                 sysfs_remove_group(&sysdev->kobj, attrs);
 792         }
 793
 794         mutex_unlock(&cpu_mutex);
 795 }
 796 EXPORT_SYMBOL_GPL(cpu_remove_sysdev_attr_group);
 797
 798
 799 /* NUMA stuff */
 800
 801 #ifdef CONFIG_NUMA
 802 static void register_nodes(void)
 803 {
 804         int i;
 805
 806         for (i = 0; i < MAX_NUMNODES; i++)
 807                 register_one_node(i);
 808 }
 809
 810 int sysfs_add_device_to_node(struct sys_device *dev, int nid)
 811 {
 812         struct node *node = &node_devices[nid];
 813         return sysfs_create_link(&node->sysdev.kobj, &dev->kobj,
 814                         kobject_name(&dev->kobj));
 815 }
 816 EXPORT_SYMBOL_GPL(sysfs_add_device_to_node);
 817
 818 void sysfs_remove_device_from_node(struct sys_device *dev, int nid)
 819 {
 820         struct node *node = &node_devices[nid];
 821         sysfs_remove_link(&node->sysdev.kobj, kobject_name(&dev->kobj));
 822 }
 823 EXPORT_SYMBOL_GPL(sysfs_remove_device_from_node);
 824
 825 #else
 826 static void register_nodes(void)
 827 {
 828         return;
 829 }
 830
 831 #endif
 832
 833 /* Only valid if CPU is present. */
 834 static ssize_t show_physical_id(struct sys_device *dev,
 835                                 struct sysdev_attribute *attr, char *buf)
 836 {
 837         struct cpu *cpu = container_of(dev, struct cpu, sysdev);
 838
 839         return sprintf(buf, "%d\n", get_hard_smp_processor_id(cpu->sysdev.id));
 840 }
 841 static SYSDEV_ATTR(physical_id, 0444, show_physical_id, NULL);
 842
 843 static int __init topology_init(void)
 844 {
 845         int cpu;
 846
 847         register_nodes();
 848         register_cpu_notifier(&sysfs_cpu_nb);
 849
 850         for_each_possible_cpu(cpu) {
 851                 struct cpu *c = &per_cpu(cpu_devices, cpu);
 852
 853                 /*
 854                  * For now, we just see if the system supports making
 855                  * the RTAS calls for CPU hotplug.  But, there may be a
 856                  * more comprehensive way to do this for an individual
 857                  * CPU.  For instance, the boot cpu might never be valid
 858                  * for hotplugging.
 859                  */
 860                 if (ppc_md.cpu_die)
 861                         c->hotpluggable = 1;
 862
 863                 if (cpu_online(cpu) || c->hotpluggable) {
 864                         register_cpu(c, cpu);
 865
 866                         sysdev_create_file(&c->sysdev, &attr_physical_id);
 867                 }
 868
 869                 if (cpu_online(cpu))
 870                         register_cpu_online(cpu);
 871         }
 872
 873         return 0;
 874 }
 875 subsys_initcall(topology_init);