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/machdep.h>
  19 #include <asm/smp.h>
  20
  21 #ifdef CONFIG_PPC64
  22 #include <asm/paca.h>
  23 #include <asm/lppaca.h>
  24 #endif
  25
  26 static DEFINE_PER_CPU(struct cpu, cpu_devices);
  27
  28 static DEFINE_PER_CPU(struct kobject *, cache_toplevel);
  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(unsigned long, smt_snooze_delay) = { 100 };
  38
  39 static ssize_t store_smt_snooze_delay(struct sys_device *dev,
  40                                       struct sysdev_attribute *attr,
  41                                       const char *buf,
  42                                       size_t count)
  43 {
  44         struct cpu *cpu = container_of(dev, struct cpu, sysdev);
  45         ssize_t ret;
  46         unsigned long snooze;
  47
  48         ret = sscanf(buf, "%lu", &snooze);
  49         if (ret != 1)
  50                 return -EINVAL;
  51
  52         per_cpu(smt_snooze_delay, cpu->sysdev.id) = snooze;
  53
  54         return count;
  55 }
  56
  57 static ssize_t show_smt_snooze_delay(struct sys_device *dev,
  58                                      struct sysdev_attribute *attr,
  59                                      char *buf)
  60 {
  61         struct cpu *cpu = container_of(dev, struct cpu, sysdev);
  62
  63         return sprintf(buf, "%lu\n", per_cpu(smt_snooze_delay, cpu->sysdev.id));
  64 }
  65
  66 static SYSDEV_ATTR(smt_snooze_delay, 0644, show_smt_snooze_delay,
  67                    store_smt_snooze_delay);
  68
  69 /* Only parse OF options if the matching cmdline option was not specified */
  70 static int smt_snooze_cmdline;
  71
  72 static int __init smt_setup(void)
  73 {
  74         struct device_node *options;
  75         const unsigned int *val;
  76         unsigned int cpu;
  77
  78         if (!cpu_has_feature(CPU_FTR_SMT))
  79                 return -ENODEV;
  80
  81         options = of_find_node_by_path("/options");
  82         if (!options)
  83                 return -ENODEV;
  84
  85         val = of_get_property(options, "ibm,smt-snooze-delay", NULL);
  86         if (!smt_snooze_cmdline && val) {
  87                 for_each_possible_cpu(cpu)
  88                         per_cpu(smt_snooze_delay, cpu) = *val;
  89         }
  90
  91         of_node_put(options);
  92         return 0;
  93 }
  94 __initcall(smt_setup);
  95
  96 static int __init setup_smt_snooze_delay(char *str)
  97 {
  98         unsigned int cpu;
  99         int snooze;
 100
 101         if (!cpu_has_feature(CPU_FTR_SMT))
 102                 return 1;
 103
 104         smt_snooze_cmdline = 1;
 105
 106         if (get_option(&str, &snooze)) {
 107                 for_each_possible_cpu(cpu)
 108                         per_cpu(smt_snooze_delay, cpu) = snooze;
 109         }
 110
 111         return 1;
 112 }
 113 __setup("smt-snooze-delay=", setup_smt_snooze_delay);
 114
 115 #endif /* CONFIG_PPC64 */
 116
 117 /*
 118  * Enabling PMCs will slow partition context switch times so we only do
 119  * it the first time we write to the PMCs.
 120  */
 121
 122 static DEFINE_PER_CPU(char, pmcs_enabled);
 123
 124 void ppc_enable_pmcs(void)
 125 {
 126         /* Only need to enable them once */
 127         if (__get_cpu_var(pmcs_enabled))
 128                 return;
 129
 130         __get_cpu_var(pmcs_enabled) = 1;
 131
 132         if (ppc_md.enable_pmcs)
 133                 ppc_md.enable_pmcs();
 134 }
 135 EXPORT_SYMBOL(ppc_enable_pmcs);
 136
 137 /* XXX convert to rusty's on_one_cpu */
 138 static unsigned long run_on_cpu(unsigned long cpu,
 139                                 unsigned long (*func)(unsigned long),
 140                                 unsigned long arg)
 141 {
 142         cpumask_t old_affinity = current->cpus_allowed;
 143         unsigned long ret;
 144
 145         /* should return -EINVAL to userspace */
 146         if (set_cpus_allowed(current, cpumask_of_cpu(cpu)))
 147                 return 0;
 148
 149         ret = func(arg);
 150
 151         set_cpus_allowed(current, old_affinity);
 152
 153         return ret;
 154 }
 155
 156 #define SYSFS_PMCSETUP(NAME, ADDRESS) \
 157 static unsigned long read_##NAME(unsigned long junk) \
 158 { \
 159         return mfspr(ADDRESS); \
 160 } \
 161 static unsigned long write_##NAME(unsigned long val) \
 162 { \
 163         ppc_enable_pmcs(); \
 164         mtspr(ADDRESS, val); \
 165         return 0; \
 166 } \
 167 static ssize_t show_##NAME(struct sys_device *dev, \
 168                         struct sysdev_attribute *attr, \
 169                         char *buf) \
 170 { \
 171         struct cpu *cpu = container_of(dev, struct cpu, sysdev); \
 172         unsigned long val = run_on_cpu(cpu->sysdev.id, read_##NAME, 0); \
 173         return sprintf(buf, "%lx\n", val); \
 174 } \
 175 static ssize_t __used \
 176         store_##NAME(struct sys_device *dev, struct sysdev_attribute *attr, \
 177                         const char *buf, size_t count) \
 178 { \
 179         struct cpu *cpu = container_of(dev, struct cpu, sysdev); \
 180         unsigned long val; \
 181         int ret = sscanf(buf, "%lx", &val); \
 182         if (ret != 1) \
 183                 return -EINVAL; \
 184         run_on_cpu(cpu->sysdev.id, write_##NAME, val); \
 185         return count; \
 186 }
 187
 188
 189 /* Let's define all possible registers, we'll only hook up the ones
 190  * that are implemented on the current processor
 191  */
 192
 193 #ifdef CONFIG_PPC64
 194 #define HAS_PPC_PMC_CLASSIC     1
 195 #define HAS_PPC_PMC_IBM         1
 196 #define HAS_PPC_PMC_PA6T        1
 197 #elif CONFIG_6xx
 198 #define HAS_PPC_PMC_CLASSIC     1
 199 #define HAS_PPC_PMC_IBM         1
 200 #define HAS_PPC_PMC_G4          1
 201 #endif
 202
 203
 204 #ifdef HAS_PPC_PMC_CLASSIC
 205 SYSFS_PMCSETUP(mmcr0, SPRN_MMCR0);
 206 SYSFS_PMCSETUP(mmcr1, SPRN_MMCR1);
 207 SYSFS_PMCSETUP(pmc1, SPRN_PMC1);
 208 SYSFS_PMCSETUP(pmc2, SPRN_PMC2);
 209 SYSFS_PMCSETUP(pmc3, SPRN_PMC3);
 210 SYSFS_PMCSETUP(pmc4, SPRN_PMC4);
 211 SYSFS_PMCSETUP(pmc5, SPRN_PMC5);
 212 SYSFS_PMCSETUP(pmc6, SPRN_PMC6);
 213
 214 #ifdef HAS_PPC_PMC_G4
 215 SYSFS_PMCSETUP(mmcr2, SPRN_MMCR2);
 216 #endif
 217
 218 #ifdef CONFIG_PPC64
 219 SYSFS_PMCSETUP(pmc7, SPRN_PMC7);
 220 SYSFS_PMCSETUP(pmc8, SPRN_PMC8);
 221
 222 SYSFS_PMCSETUP(mmcra, SPRN_MMCRA);
 223 SYSFS_PMCSETUP(purr, SPRN_PURR);
 224 SYSFS_PMCSETUP(spurr, SPRN_SPURR);
 225 SYSFS_PMCSETUP(dscr, SPRN_DSCR);
 226
 227 static SYSDEV_ATTR(mmcra, 0600, show_mmcra, store_mmcra);
 228 static SYSDEV_ATTR(spurr, 0600, show_spurr, NULL);
 229 static SYSDEV_ATTR(dscr, 0600, show_dscr, store_dscr);
 230 static SYSDEV_ATTR(purr, 0600, show_purr, store_purr);
 231 #endif /* CONFIG_PPC64 */
 232
 233 #ifdef HAS_PPC_PMC_PA6T
 234 SYSFS_PMCSETUP(pa6t_pmc0, SPRN_PA6T_PMC0);
 235 SYSFS_PMCSETUP(pa6t_pmc1, SPRN_PA6T_PMC1);
 236 SYSFS_PMCSETUP(pa6t_pmc2, SPRN_PA6T_PMC2);
 237 SYSFS_PMCSETUP(pa6t_pmc3, SPRN_PA6T_PMC3);
 238 SYSFS_PMCSETUP(pa6t_pmc4, SPRN_PA6T_PMC4);
 239 SYSFS_PMCSETUP(pa6t_pmc5, SPRN_PA6T_PMC5);
 240 #ifdef CONFIG_DEBUG_KERNEL
 241 SYSFS_PMCSETUP(hid0, SPRN_HID0);
 242 SYSFS_PMCSETUP(hid1, SPRN_HID1);
 243 SYSFS_PMCSETUP(hid4, SPRN_HID4);
 244 SYSFS_PMCSETUP(hid5, SPRN_HID5);
 245 SYSFS_PMCSETUP(ima0, SPRN_PA6T_IMA0);
 246 SYSFS_PMCSETUP(ima1, SPRN_PA6T_IMA1);
 247 SYSFS_PMCSETUP(ima2, SPRN_PA6T_IMA2);
 248 SYSFS_PMCSETUP(ima3, SPRN_PA6T_IMA3);
 249 SYSFS_PMCSETUP(ima4, SPRN_PA6T_IMA4);
 250 SYSFS_PMCSETUP(ima5, SPRN_PA6T_IMA5);
 251 SYSFS_PMCSETUP(ima6, SPRN_PA6T_IMA6);
 252 SYSFS_PMCSETUP(ima7, SPRN_PA6T_IMA7);
 253 SYSFS_PMCSETUP(ima8, SPRN_PA6T_IMA8);
 254 SYSFS_PMCSETUP(ima9, SPRN_PA6T_IMA9);
 255 SYSFS_PMCSETUP(imaat, SPRN_PA6T_IMAAT);
 256 SYSFS_PMCSETUP(btcr, SPRN_PA6T_BTCR);
 257 SYSFS_PMCSETUP(pccr, SPRN_PA6T_PCCR);
 258 SYSFS_PMCSETUP(rpccr, SPRN_PA6T_RPCCR);
 259 SYSFS_PMCSETUP(der, SPRN_PA6T_DER);
 260 SYSFS_PMCSETUP(mer, SPRN_PA6T_MER);
 261 SYSFS_PMCSETUP(ber, SPRN_PA6T_BER);
 262 SYSFS_PMCSETUP(ier, SPRN_PA6T_IER);
 263 SYSFS_PMCSETUP(sier, SPRN_PA6T_SIER);
 264 SYSFS_PMCSETUP(siar, SPRN_PA6T_SIAR);
 265 SYSFS_PMCSETUP(tsr0, SPRN_PA6T_TSR0);
 266 SYSFS_PMCSETUP(tsr1, SPRN_PA6T_TSR1);
 267 SYSFS_PMCSETUP(tsr2, SPRN_PA6T_TSR2);
 268 SYSFS_PMCSETUP(tsr3, SPRN_PA6T_TSR3);
 269 #endif /* CONFIG_DEBUG_KERNEL */
 270 #endif /* HAS_PPC_PMC_PA6T */
 271
 272 #ifdef HAS_PPC_PMC_IBM
 273 static struct sysdev_attribute ibm_common_attrs[] = {
 274         _SYSDEV_ATTR(mmcr0, 0600, show_mmcr0, store_mmcr0),
 275         _SYSDEV_ATTR(mmcr1, 0600, show_mmcr1, store_mmcr1),
 276 };
 277 #endif /* HAS_PPC_PMC_G4 */
 278
 279 #ifdef HAS_PPC_PMC_G4
 280 static struct sysdev_attribute g4_common_attrs[] = {
 281         _SYSDEV_ATTR(mmcr0, 0600, show_mmcr0, store_mmcr0),
 282         _SYSDEV_ATTR(mmcr1, 0600, show_mmcr1, store_mmcr1),
 283         _SYSDEV_ATTR(mmcr2, 0600, show_mmcr2, store_mmcr2),
 284 };
 285 #endif /* HAS_PPC_PMC_G4 */
 286
 287 static struct sysdev_attribute classic_pmc_attrs[] = {
 288         _SYSDEV_ATTR(pmc1, 0600, show_pmc1, store_pmc1),
 289         _SYSDEV_ATTR(pmc2, 0600, show_pmc2, store_pmc2),
 290         _SYSDEV_ATTR(pmc3, 0600, show_pmc3, store_pmc3),
 291         _SYSDEV_ATTR(pmc4, 0600, show_pmc4, store_pmc4),
 292         _SYSDEV_ATTR(pmc5, 0600, show_pmc5, store_pmc5),
 293         _SYSDEV_ATTR(pmc6, 0600, show_pmc6, store_pmc6),
 294 #ifdef CONFIG_PPC64
 295         _SYSDEV_ATTR(pmc7, 0600, show_pmc7, store_pmc7),
 296         _SYSDEV_ATTR(pmc8, 0600, show_pmc8, store_pmc8),
 297 #endif
 298 };
 299
 300 #ifdef HAS_PPC_PMC_PA6T
 301 static struct sysdev_attribute pa6t_attrs[] = {
 302         _SYSDEV_ATTR(mmcr0, 0600, show_mmcr0, store_mmcr0),
 303         _SYSDEV_ATTR(mmcr1, 0600, show_mmcr1, store_mmcr1),
 304         _SYSDEV_ATTR(pmc0, 0600, show_pa6t_pmc0, store_pa6t_pmc0),
 305         _SYSDEV_ATTR(pmc1, 0600, show_pa6t_pmc1, store_pa6t_pmc1),
 306         _SYSDEV_ATTR(pmc2, 0600, show_pa6t_pmc2, store_pa6t_pmc2),
 307         _SYSDEV_ATTR(pmc3, 0600, show_pa6t_pmc3, store_pa6t_pmc3),
 308         _SYSDEV_ATTR(pmc4, 0600, show_pa6t_pmc4, store_pa6t_pmc4),
 309         _SYSDEV_ATTR(pmc5, 0600, show_pa6t_pmc5, store_pa6t_pmc5),
 310 #ifdef CONFIG_DEBUG_KERNEL
 311         _SYSDEV_ATTR(hid0, 0600, show_hid0, store_hid0),
 312         _SYSDEV_ATTR(hid1, 0600, show_hid1, store_hid1),
 313         _SYSDEV_ATTR(hid4, 0600, show_hid4, store_hid4),
 314         _SYSDEV_ATTR(hid5, 0600, show_hid5, store_hid5),
 315         _SYSDEV_ATTR(ima0, 0600, show_ima0, store_ima0),
 316         _SYSDEV_ATTR(ima1, 0600, show_ima1, store_ima1),
 317         _SYSDEV_ATTR(ima2, 0600, show_ima2, store_ima2),
 318         _SYSDEV_ATTR(ima3, 0600, show_ima3, store_ima3),
 319         _SYSDEV_ATTR(ima4, 0600, show_ima4, store_ima4),
 320         _SYSDEV_ATTR(ima5, 0600, show_ima5, store_ima5),
 321         _SYSDEV_ATTR(ima6, 0600, show_ima6, store_ima6),
 322         _SYSDEV_ATTR(ima7, 0600, show_ima7, store_ima7),
 323         _SYSDEV_ATTR(ima8, 0600, show_ima8, store_ima8),
 324         _SYSDEV_ATTR(ima9, 0600, show_ima9, store_ima9),
 325         _SYSDEV_ATTR(imaat, 0600, show_imaat, store_imaat),
 326         _SYSDEV_ATTR(btcr, 0600, show_btcr, store_btcr),
 327         _SYSDEV_ATTR(pccr, 0600, show_pccr, store_pccr),
 328         _SYSDEV_ATTR(rpccr, 0600, show_rpccr, store_rpccr),
 329         _SYSDEV_ATTR(der, 0600, show_der, store_der),
 330         _SYSDEV_ATTR(mer, 0600, show_mer, store_mer),
 331         _SYSDEV_ATTR(ber, 0600, show_ber, store_ber),
 332         _SYSDEV_ATTR(ier, 0600, show_ier, store_ier),
 333         _SYSDEV_ATTR(sier, 0600, show_sier, store_sier),
 334         _SYSDEV_ATTR(siar, 0600, show_siar, store_siar),
 335         _SYSDEV_ATTR(tsr0, 0600, show_tsr0, store_tsr0),
 336         _SYSDEV_ATTR(tsr1, 0600, show_tsr1, store_tsr1),
 337         _SYSDEV_ATTR(tsr2, 0600, show_tsr2, store_tsr2),
 338         _SYSDEV_ATTR(tsr3, 0600, show_tsr3, store_tsr3),
 339 #endif /* CONFIG_DEBUG_KERNEL */
 340 };
 341 #endif /* HAS_PPC_PMC_PA6T */
 342 #endif /* HAS_PPC_PMC_CLASSIC */
 343
 344 struct cache_desc {
 345         struct kobject kobj;
 346         struct cache_desc *next;
 347         const char *type;       /* Instruction, Data, or Unified */
 348         u32 size;               /* total cache size in KB */
 349         u32 line_size;          /* in bytes */
 350         u32 nr_sets;            /* number of sets */
 351         u32 level;              /* e.g. 1, 2, 3... */
 352         u32 associativity;      /* e.g. 8-way... 0 is fully associative */
 353 };
 354
 355 DEFINE_PER_CPU(struct cache_desc *, cache_desc);
 356
 357 static struct cache_desc *kobj_to_cache_desc(struct kobject *k)
 358 {
 359         return container_of(k, struct cache_desc, kobj);
 360 }
 361
 362 static void cache_desc_release(struct kobject *k)
 363 {
 364         struct cache_desc *desc = kobj_to_cache_desc(k);
 365
 366         pr_debug("%s: releasing %s\n", __func__, kobject_name(k));
 367
 368         if (desc->next)
 369                 kobject_put(&desc->next->kobj);
 370
 371         kfree(kobj_to_cache_desc(k));
 372 }
 373
 374 static ssize_t cache_desc_show(struct kobject *k, struct attribute *attr, char *buf)
 375 {
 376         struct kobj_attribute *kobj_attr;
 377
 378         kobj_attr = container_of(attr, struct kobj_attribute, attr);
 379
 380         return kobj_attr->show(k, kobj_attr, buf);
 381 }
 382
 383 static struct sysfs_ops cache_desc_sysfs_ops = {
 384         .show = cache_desc_show,
 385 };
 386
 387 static struct kobj_type cache_desc_type = {
 388         .release = cache_desc_release,
 389         .sysfs_ops = &cache_desc_sysfs_ops,
 390 };
 391
 392 static ssize_t cache_size_show(struct kobject *k, struct kobj_attribute *attr, char *buf)
 393 {
 394         struct cache_desc *cache = kobj_to_cache_desc(k);
 395
 396         return sprintf(buf, "%uK\n", cache->size);
 397 }
 398
 399 static struct kobj_attribute cache_size_attr =
 400         __ATTR(size, 0444, cache_size_show, NULL);
 401
 402 static ssize_t cache_line_size_show(struct kobject *k, struct kobj_attribute *attr, char *buf)
 403 {
 404         struct cache_desc *cache = kobj_to_cache_desc(k);
 405
 406         return sprintf(buf, "%u\n", cache->line_size);
 407 }
 408
 409 static struct kobj_attribute cache_line_size_attr =
 410         __ATTR(coherency_line_size, 0444, cache_line_size_show, NULL);
 411
 412 static ssize_t cache_nr_sets_show(struct kobject *k, struct kobj_attribute *attr, char *buf)
 413 {
 414         struct cache_desc *cache = kobj_to_cache_desc(k);
 415
 416         return sprintf(buf, "%u\n", cache->nr_sets);
 417 }
 418
 419 static struct kobj_attribute cache_nr_sets_attr =
 420         __ATTR(number_of_sets, 0444, cache_nr_sets_show, NULL);
 421
 422 static ssize_t cache_type_show(struct kobject *k, struct kobj_attribute *attr, char *buf)
 423 {
 424         struct cache_desc *cache = kobj_to_cache_desc(k);
 425
 426         return sprintf(buf, "%s\n", cache->type);
 427 }
 428
 429 static struct kobj_attribute cache_type_attr =
 430         __ATTR(type, 0444, cache_type_show, NULL);
 431
 432 static ssize_t cache_level_show(struct kobject *k, struct kobj_attribute *attr, char *buf)
 433 {
 434         struct cache_desc *cache = kobj_to_cache_desc(k);
 435
 436         return sprintf(buf, "%u\n", cache->level);
 437 }
 438
 439 static struct kobj_attribute cache_level_attr =
 440         __ATTR(level, 0444, cache_level_show, NULL);
 441
 442 static ssize_t cache_assoc_show(struct kobject *k, struct kobj_attribute *attr, char *buf)
 443 {
 444         struct cache_desc *cache = kobj_to_cache_desc(k);
 445
 446         return sprintf(buf, "%u\n", cache->associativity);
 447 }
 448
 449 static struct kobj_attribute cache_assoc_attr =
 450         __ATTR(ways_of_associativity, 0444, cache_assoc_show, NULL);
 451
 452 struct cache_desc_info {
 453         const char *type;
 454         const char *size_prop;
 455         const char *line_size_prop;
 456         const char *nr_sets_prop;
 457 };
 458
 459 /* PowerPC Processor binding says the [di]-cache-* must be equal on
 460  * unified caches, so just use d-cache properties. */
 461 static struct cache_desc_info ucache_info = {
 462         .type = "Unified",
 463         .size_prop = "d-cache-size",
 464         .line_size_prop = "d-cache-line-size",
 465         .nr_sets_prop = "d-cache-sets",
 466 };
 467
 468 static struct cache_desc_info dcache_info = {
 469         .type = "Data",
 470         .size_prop = "d-cache-size",
 471         .line_size_prop = "d-cache-line-size",
 472         .nr_sets_prop = "d-cache-sets",
 473 };
 474
 475 static struct cache_desc_info icache_info = {
 476         .type = "Instruction",
 477         .size_prop = "i-cache-size",
 478         .line_size_prop = "i-cache-line-size",
 479         .nr_sets_prop = "i-cache-sets",
 480 };
 481
 482 static struct cache_desc * __cpuinit create_cache_desc(struct device_node *np, struct kobject *parent, int index, int level, struct cache_desc_info *info)
 483 {
 484         const u32 *cache_line_size;
 485         struct cache_desc *new;
 486         const u32 *cache_size;
 487         const u32 *nr_sets;
 488         int rc;
 489
 490         new = kzalloc(sizeof(*new), GFP_KERNEL);
 491         if (!new)
 492                 return NULL;
 493
 494         rc = kobject_init_and_add(&new->kobj, &cache_desc_type, parent,
 495                                   "index%d", index);
 496         if (rc)
 497                 goto err;
 498
 499         /* type */
 500         new->type = info->type;
 501         rc = sysfs_create_file(&new->kobj, &cache_type_attr.attr);
 502         WARN_ON(rc);
 503
 504         /* level */
 505         new->level = level;
 506         rc = sysfs_create_file(&new->kobj, &cache_level_attr.attr);
 507         WARN_ON(rc);
 508
 509         /* size */
 510         cache_size = of_get_property(np, info->size_prop, NULL);
 511         if (cache_size) {
 512                 new->size = *cache_size / 1024;
 513                 rc = sysfs_create_file(&new->kobj,
 514                                        &cache_size_attr.attr);
 515                 WARN_ON(rc);
 516         }
 517
 518         /* coherency_line_size */
 519         cache_line_size = of_get_property(np, info->line_size_prop, NULL);
 520         if (cache_line_size) {
 521                 new->line_size = *cache_line_size;
 522                 rc = sysfs_create_file(&new->kobj,
 523                                        &cache_line_size_attr.attr);
 524                 WARN_ON(rc);
 525         }
 526
 527         /* number_of_sets */
 528         nr_sets = of_get_property(np, info->nr_sets_prop, NULL);
 529         if (nr_sets) {
 530                 new->nr_sets = *nr_sets;
 531                 rc = sysfs_create_file(&new->kobj,
 532                                        &cache_nr_sets_attr.attr);
 533                 WARN_ON(rc);
 534         }
 535
 536         /* ways_of_associativity */
 537         if (new->nr_sets == 1) {
 538                 /* fully associative */
 539                 new->associativity = 0;
 540                 goto create_assoc;
 541         }
 542
 543         if (new->nr_sets && new->size && new->line_size) {
 544                 /* If we have values for all of these we can derive
 545                  * the associativity. */
 546                 new->associativity =
 547                         ((new->size * 1024) / new->nr_sets) / new->line_size;
 548 create_assoc:
 549                 rc = sysfs_create_file(&new->kobj,
 550                                        &cache_assoc_attr.attr);
 551                 WARN_ON(rc);
 552         }
 553
 554         return new;
 555 err:
 556         kfree(new);
 557         return NULL;
 558 }
 559
 560 static bool cache_is_unified(struct device_node *np)
 561 {
 562         return of_get_property(np, "cache-unified", NULL);
 563 }
 564
 565 static struct cache_desc * __cpuinit create_cache_index_info(struct device_node *np, struct kobject *parent, int index, int level)
 566 {
 567         const phandle *next_cache_phandle;
 568         struct device_node *next_cache;
 569         struct cache_desc *new, **end;
 570
 571         pr_debug("%s(node = %s, index = %d)\n", __func__, np->full_name, index);
 572
 573         if (cache_is_unified(np)) {
 574                 new = create_cache_desc(np, parent, index, level,
 575                                         &ucache_info);
 576         } else {
 577                 new = create_cache_desc(np, parent, index, level,
 578                                         &dcache_info);
 579                 if (new) {
 580                         index++;
 581                         new->next = create_cache_desc(np, parent, index, level,
 582                                                       &icache_info);
 583                 }
 584         }
 585         if (!new)
 586                 return NULL;
 587
 588         end = &new->next;
 589         while (*end)
 590                 end = &(*end)->next;
 591
 592         next_cache_phandle = of_get_property(np, "l2-cache", NULL);
 593         if (!next_cache_phandle)
 594                 goto out;
 595
 596         next_cache = of_find_node_by_phandle(*next_cache_phandle);
 597         if (!next_cache)
 598                 goto out;
 599
 600         *end = create_cache_index_info(next_cache, parent, ++index, ++level);
 601
 602         of_node_put(next_cache);
 603 out:
 604         return new;
 605 }
 606
 607 static void __cpuinit create_cache_info(struct sys_device *sysdev)
 608 {
 609         struct kobject *cache_toplevel;
 610         struct device_node *np = NULL;
 611         int cpu = sysdev->id;
 612
 613         cache_toplevel = kobject_create_and_add("cache", &sysdev->kobj);
 614         if (!cache_toplevel)
 615                 return;
 616         per_cpu(cache_toplevel, cpu) = cache_toplevel;
 617         np = of_get_cpu_node(cpu, NULL);
 618         if (np != NULL) {
 619                 per_cpu(cache_desc, cpu) =
 620                         create_cache_index_info(np, cache_toplevel, 0, 1);
 621                 of_node_put(np);
 622         }
 623         return;
 624 }
 625
 626 static void __cpuinit register_cpu_online(unsigned int cpu)
 627 {
 628         struct cpu *c = &per_cpu(cpu_devices, cpu);
 629         struct sys_device *s = &c->sysdev;
 630         struct sysdev_attribute *attrs, *pmc_attrs;
 631         int i, nattrs;
 632
 633 #ifdef CONFIG_PPC64
 634         if (!firmware_has_feature(FW_FEATURE_ISERIES) &&
 635                         cpu_has_feature(CPU_FTR_SMT))
 636                 sysdev_create_file(s, &attr_smt_snooze_delay);
 637 #endif
 638
 639         /* PMC stuff */
 640         switch (cur_cpu_spec->pmc_type) {
 641 #ifdef HAS_PPC_PMC_IBM
 642         case PPC_PMC_IBM:
 643                 attrs = ibm_common_attrs;
 644                 nattrs = sizeof(ibm_common_attrs) / sizeof(struct sysdev_attribute);
 645                 pmc_attrs = classic_pmc_attrs;
 646                 break;
 647 #endif /* HAS_PPC_PMC_IBM */
 648 #ifdef HAS_PPC_PMC_G4
 649         case PPC_PMC_G4:
 650                 attrs = g4_common_attrs;
 651                 nattrs = sizeof(g4_common_attrs) / sizeof(struct sysdev_attribute);
 652                 pmc_attrs = classic_pmc_attrs;
 653                 break;
 654 #endif /* HAS_PPC_PMC_G4 */
 655 #ifdef HAS_PPC_PMC_PA6T
 656         case PPC_PMC_PA6T:
 657                 /* PA Semi starts counting at PMC0 */
 658                 attrs = pa6t_attrs;
 659                 nattrs = sizeof(pa6t_attrs) / sizeof(struct sysdev_attribute);
 660                 pmc_attrs = NULL;
 661                 break;
 662 #endif /* HAS_PPC_PMC_PA6T */
 663         default:
 664                 attrs = NULL;
 665                 nattrs = 0;
 666                 pmc_attrs = NULL;
 667         }
 668
 669         for (i = 0; i < nattrs; i++)
 670                 sysdev_create_file(s, &attrs[i]);
 671
 672         if (pmc_attrs)
 673                 for (i = 0; i < cur_cpu_spec->num_pmcs; i++)
 674                         sysdev_create_file(s, &pmc_attrs[i]);
 675
 676 #ifdef CONFIG_PPC64
 677         if (cpu_has_feature(CPU_FTR_MMCRA))
 678                 sysdev_create_file(s, &attr_mmcra);
 679
 680         if (cpu_has_feature(CPU_FTR_PURR))
 681                 sysdev_create_file(s, &attr_purr);
 682
 683         if (cpu_has_feature(CPU_FTR_SPURR))
 684                 sysdev_create_file(s, &attr_spurr);
 685
 686         if (cpu_has_feature(CPU_FTR_DSCR))
 687                 sysdev_create_file(s, &attr_dscr);
 688 #endif /* CONFIG_PPC64 */
 689
 690         create_cache_info(s);
 691 }
 692
 693 #ifdef CONFIG_HOTPLUG_CPU
 694 static void remove_cache_info(struct sys_device *sysdev)
 695 {
 696         struct kobject *cache_toplevel;
 697         struct cache_desc *cache_desc;
 698         int cpu = sysdev->id;
 699
 700         cache_desc = per_cpu(cache_desc, cpu);
 701         if (cache_desc != NULL)
 702                 kobject_put(&cache_desc->kobj);
 703
 704         cache_toplevel = per_cpu(cache_toplevel, cpu);
 705         if (cache_toplevel != NULL)
 706                 kobject_put(cache_toplevel);
 707 }
 708
 709 static void unregister_cpu_online(unsigned int cpu)
 710 {
 711         struct cpu *c = &per_cpu(cpu_devices, cpu);
 712         struct sys_device *s = &c->sysdev;
 713         struct sysdev_attribute *attrs, *pmc_attrs;
 714         int i, nattrs;
 715
 716         BUG_ON(!c->hotpluggable);
 717
 718         if (!firmware_has_feature(FW_FEATURE_ISERIES) &&
 719                         cpu_has_feature(CPU_FTR_SMT))
 720                 sysdev_remove_file(s, &attr_smt_snooze_delay);
 721
 722         /* PMC stuff */
 723         switch (cur_cpu_spec->pmc_type) {
 724 #ifdef HAS_PPC_PMC_IBM
 725         case PPC_PMC_IBM:
 726                 attrs = ibm_common_attrs;
 727                 nattrs = sizeof(ibm_common_attrs) / sizeof(struct sysdev_attribute);
 728                 pmc_attrs = classic_pmc_attrs;
 729                 break;
 730 #endif /* HAS_PPC_PMC_IBM */
 731 #ifdef HAS_PPC_PMC_G4
 732         case PPC_PMC_G4:
 733                 attrs = g4_common_attrs;
 734                 nattrs = sizeof(g4_common_attrs) / sizeof(struct sysdev_attribute);
 735                 pmc_attrs = classic_pmc_attrs;
 736                 break;
 737 #endif /* HAS_PPC_PMC_G4 */
 738 #ifdef HAS_PPC_PMC_PA6T
 739         case PPC_PMC_PA6T:
 740                 /* PA Semi starts counting at PMC0 */
 741                 attrs = pa6t_attrs;
 742                 nattrs = sizeof(pa6t_attrs) / sizeof(struct sysdev_attribute);
 743                 pmc_attrs = NULL;
 744                 break;
 745 #endif /* HAS_PPC_PMC_PA6T */
 746         default:
 747                 attrs = NULL;
 748                 nattrs = 0;
 749                 pmc_attrs = NULL;
 750         }
 751
 752         for (i = 0; i < nattrs; i++)
 753                 sysdev_remove_file(s, &attrs[i]);
 754
 755         if (pmc_attrs)
 756                 for (i = 0; i < cur_cpu_spec->num_pmcs; i++)
 757                         sysdev_remove_file(s, &pmc_attrs[i]);
 758
 759 #ifdef CONFIG_PPC64
 760         if (cpu_has_feature(CPU_FTR_MMCRA))
 761                 sysdev_remove_file(s, &attr_mmcra);
 762
 763         if (cpu_has_feature(CPU_FTR_PURR))
 764                 sysdev_remove_file(s, &attr_purr);
 765
 766         if (cpu_has_feature(CPU_FTR_SPURR))
 767                 sysdev_remove_file(s, &attr_spurr);
 768
 769         if (cpu_has_feature(CPU_FTR_DSCR))
 770                 sysdev_remove_file(s, &attr_dscr);
 771 #endif /* CONFIG_PPC64 */
 772
 773         remove_cache_info(s);
 774 }
 775 #endif /* CONFIG_HOTPLUG_CPU */
 776
 777 static int __cpuinit sysfs_cpu_notify(struct notifier_block *self,
 778                                       unsigned long action, void *hcpu)
 779 {
 780         unsigned int cpu = (unsigned int)(long)hcpu;
 781
 782         switch (action) {
 783         case CPU_ONLINE:
 784         case CPU_ONLINE_FROZEN:
 785                 register_cpu_online(cpu);
 786                 break;
 787 #ifdef CONFIG_HOTPLUG_CPU
 788         case CPU_DEAD:
 789         case CPU_DEAD_FROZEN:
 790                 unregister_cpu_online(cpu);
 791                 break;
 792 #endif
 793         }
 794         return NOTIFY_OK;
 795 }
 796
 797 static struct notifier_block __cpuinitdata sysfs_cpu_nb = {
 798         .notifier_call  = sysfs_cpu_notify,
 799 };
 800
 801 static DEFINE_MUTEX(cpu_mutex);
 802
 803 int cpu_add_sysdev_attr(struct sysdev_attribute *attr)
 804 {
 805         int cpu;
 806
 807         mutex_lock(&cpu_mutex);
 808
 809         for_each_possible_cpu(cpu) {
 810                 sysdev_create_file(get_cpu_sysdev(cpu), attr);
 811         }
 812
 813         mutex_unlock(&cpu_mutex);
 814         return 0;
 815 }
 816 EXPORT_SYMBOL_GPL(cpu_add_sysdev_attr);
 817
 818 int cpu_add_sysdev_attr_group(struct attribute_group *attrs)
 819 {
 820         int cpu;
 821         struct sys_device *sysdev;
 822         int ret;
 823
 824         mutex_lock(&cpu_mutex);
 825
 826         for_each_possible_cpu(cpu) {
 827                 sysdev = get_cpu_sysdev(cpu);
 828                 ret = sysfs_create_group(&sysdev->kobj, attrs);
 829                 WARN_ON(ret != 0);
 830         }
 831
 832         mutex_unlock(&cpu_mutex);
 833         return 0;
 834 }
 835 EXPORT_SYMBOL_GPL(cpu_add_sysdev_attr_group);
 836
 837
 838 void cpu_remove_sysdev_attr(struct sysdev_attribute *attr)
 839 {
 840         int cpu;
 841
 842         mutex_lock(&cpu_mutex);
 843
 844         for_each_possible_cpu(cpu) {
 845                 sysdev_remove_file(get_cpu_sysdev(cpu), attr);
 846         }
 847
 848         mutex_unlock(&cpu_mutex);
 849 }
 850 EXPORT_SYMBOL_GPL(cpu_remove_sysdev_attr);
 851
 852 void cpu_remove_sysdev_attr_group(struct attribute_group *attrs)
 853 {
 854         int cpu;
 855         struct sys_device *sysdev;
 856
 857         mutex_lock(&cpu_mutex);
 858
 859         for_each_possible_cpu(cpu) {
 860                 sysdev = get_cpu_sysdev(cpu);
 861                 sysfs_remove_group(&sysdev->kobj, attrs);
 862         }
 863
 864         mutex_unlock(&cpu_mutex);
 865 }
 866 EXPORT_SYMBOL_GPL(cpu_remove_sysdev_attr_group);
 867
 868
 869 /* NUMA stuff */
 870
 871 #ifdef CONFIG_NUMA
 872 static void register_nodes(void)
 873 {
 874         int i;
 875
 876         for (i = 0; i < MAX_NUMNODES; i++)
 877                 register_one_node(i);
 878 }
 879
 880 int sysfs_add_device_to_node(struct sys_device *dev, int nid)
 881 {
 882         struct node *node = &node_devices[nid];
 883         return sysfs_create_link(&node->sysdev.kobj, &dev->kobj,
 884                         kobject_name(&dev->kobj));
 885 }
 886 EXPORT_SYMBOL_GPL(sysfs_add_device_to_node);
 887
 888 void sysfs_remove_device_from_node(struct sys_device *dev, int nid)
 889 {
 890         struct node *node = &node_devices[nid];
 891         sysfs_remove_link(&node->sysdev.kobj, kobject_name(&dev->kobj));
 892 }
 893 EXPORT_SYMBOL_GPL(sysfs_remove_device_from_node);
 894
 895 #else
 896 static void register_nodes(void)
 897 {
 898         return;
 899 }
 900
 901 #endif
 902
 903 /* Only valid if CPU is present. */
 904 static ssize_t show_physical_id(struct sys_device *dev,
 905                                 struct sysdev_attribute *attr, char *buf)
 906 {
 907         struct cpu *cpu = container_of(dev, struct cpu, sysdev);
 908
 909         return sprintf(buf, "%d\n", get_hard_smp_processor_id(cpu->sysdev.id));
 910 }
 911 static SYSDEV_ATTR(physical_id, 0444, show_physical_id, NULL);
 912
 913 static int __init topology_init(void)
 914 {
 915         int cpu;
 916
 917         register_nodes();
 918         register_cpu_notifier(&sysfs_cpu_nb);
 919
 920         for_each_possible_cpu(cpu) {
 921                 struct cpu *c = &per_cpu(cpu_devices, cpu);
 922
 923                 /*
 924                  * For now, we just see if the system supports making
 925                  * the RTAS calls for CPU hotplug.  But, there may be a
 926                  * more comprehensive way to do this for an individual
 927                  * CPU.  For instance, the boot cpu might never be valid
 928                  * for hotplugging.
 929                  */
 930                 if (ppc_md.cpu_die)
 931                         c->hotpluggable = 1;
 932
 933                 if (cpu_online(cpu) || c->hotpluggable) {
 934                         register_cpu(c, cpu);
 935
 936                         sysdev_create_file(&c->sysdev, &attr_physical_id);
 937                 }
 938
 939                 if (cpu_online(cpu))
 940                         register_cpu_online(cpu);
 941         }
 942
 943         return 0;
 944 }
 945 subsys_initcall(topology_init);