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