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         const phandle *next_cache_phandle;
 570         struct device_node *next_cache;
 571         struct cache_desc *new, **end;
 572
 573         pr_debug("%s(node = %s, index = %d)\n", __func__, np->full_name, index);
 574
 575         if (cache_is_unified(np)) {
 576                 new = create_cache_desc(np, parent, index, level,
 577                                         &ucache_info);
 578         } else {
 579                 new = create_cache_desc(np, parent, index, level,
 580                                         &dcache_info);
 581                 if (new) {
 582                         index++;
 583                         new->next = create_cache_desc(np, parent, index, level,
 584                                                       &icache_info);
 585                 }
 586         }
 587         if (!new)
 588                 return NULL;
 589
 590         end = &new->next;
 591         while (*end)
 592                 end = &(*end)->next;
 593
 594         next_cache_phandle = of_get_property(np, "l2-cache", NULL);
 595         if (!next_cache_phandle)
 596                 goto out;
 597
 598         next_cache = of_find_node_by_phandle(*next_cache_phandle);
 599         if (!next_cache)
 600                 goto out;
 601
 602         *end = create_cache_index_info(next_cache, parent, ++index, ++level);
 603
 604         of_node_put(next_cache);
 605 out:
 606         return new;
 607 }
 608
 609 static void __cpuinit create_cache_info(struct sys_device *sysdev)
 610 {
 611         struct kobject *cache_toplevel;
 612         struct device_node *np = NULL;
 613         int cpu = sysdev->id;
 614
 615         cache_toplevel = kobject_create_and_add("cache", &sysdev->kobj);
 616         if (!cache_toplevel)
 617                 return;
 618         per_cpu(cache_toplevel, cpu) = cache_toplevel;
 619         np = of_get_cpu_node(cpu, NULL);
 620         if (np != NULL) {
 621                 per_cpu(cache_desc, cpu) =
 622                         create_cache_index_info(np, cache_toplevel, 0, 1);
 623                 of_node_put(np);
 624         }
 625         return;
 626 }
 627
 628 static void __cpuinit register_cpu_online(unsigned int cpu)
 629 {
 630         struct cpu *c = &per_cpu(cpu_devices, cpu);
 631         struct sys_device *s = &c->sysdev;
 632         struct sysdev_attribute *attrs, *pmc_attrs;
 633         int i, nattrs;
 634
 635 #ifdef CONFIG_PPC64
 636         if (!firmware_has_feature(FW_FEATURE_ISERIES) &&
 637                         cpu_has_feature(CPU_FTR_SMT))
 638                 sysdev_create_file(s, &attr_smt_snooze_delay);
 639 #endif
 640
 641         /* PMC stuff */
 642         switch (cur_cpu_spec->pmc_type) {
 643 #ifdef HAS_PPC_PMC_IBM
 644         case PPC_PMC_IBM:
 645                 attrs = ibm_common_attrs;
 646                 nattrs = sizeof(ibm_common_attrs) / sizeof(struct sysdev_attribute);
 647                 pmc_attrs = classic_pmc_attrs;
 648                 break;
 649 #endif /* HAS_PPC_PMC_IBM */
 650 #ifdef HAS_PPC_PMC_G4
 651         case PPC_PMC_G4:
 652                 attrs = g4_common_attrs;
 653                 nattrs = sizeof(g4_common_attrs) / sizeof(struct sysdev_attribute);
 654                 pmc_attrs = classic_pmc_attrs;
 655                 break;
 656 #endif /* HAS_PPC_PMC_G4 */
 657 #ifdef HAS_PPC_PMC_PA6T
 658         case PPC_PMC_PA6T:
 659                 /* PA Semi starts counting at PMC0 */
 660                 attrs = pa6t_attrs;
 661                 nattrs = sizeof(pa6t_attrs) / sizeof(struct sysdev_attribute);
 662                 pmc_attrs = NULL;
 663                 break;
 664 #endif /* HAS_PPC_PMC_PA6T */
 665         default:
 666                 attrs = NULL;
 667                 nattrs = 0;
 668                 pmc_attrs = NULL;
 669         }
 670
 671         for (i = 0; i < nattrs; i++)
 672                 sysdev_create_file(s, &attrs[i]);
 673
 674         if (pmc_attrs)
 675                 for (i = 0; i < cur_cpu_spec->num_pmcs; i++)
 676                         sysdev_create_file(s, &pmc_attrs[i]);
 677
 678 #ifdef CONFIG_PPC64
 679         if (cpu_has_feature(CPU_FTR_MMCRA))
 680                 sysdev_create_file(s, &attr_mmcra);
 681
 682         if (cpu_has_feature(CPU_FTR_PURR))
 683                 sysdev_create_file(s, &attr_purr);
 684
 685         if (cpu_has_feature(CPU_FTR_SPURR))
 686                 sysdev_create_file(s, &attr_spurr);
 687
 688         if (cpu_has_feature(CPU_FTR_DSCR))
 689                 sysdev_create_file(s, &attr_dscr);
 690 #endif /* CONFIG_PPC64 */
 691
 692         create_cache_info(s);
 693 }
 694
 695 #ifdef CONFIG_HOTPLUG_CPU
 696 static void remove_cache_info(struct sys_device *sysdev)
 697 {
 698         struct kobject *cache_toplevel;
 699         struct cache_desc *cache_desc;
 700         int cpu = sysdev->id;
 701
 702         cache_desc = per_cpu(cache_desc, cpu);
 703         if (cache_desc != NULL)
 704                 kobject_put(&cache_desc->kobj);
 705
 706         cache_toplevel = per_cpu(cache_toplevel, cpu);
 707         if (cache_toplevel != NULL)
 708                 kobject_put(cache_toplevel);
 709 }
 710
 711 static void unregister_cpu_online(unsigned int cpu)
 712 {
 713         struct cpu *c = &per_cpu(cpu_devices, cpu);
 714         struct sys_device *s = &c->sysdev;
 715         struct sysdev_attribute *attrs, *pmc_attrs;
 716         int i, nattrs;
 717
 718         BUG_ON(!c->hotpluggable);
 719
 720 #ifdef CONFIG_PPC64
 721         if (!firmware_has_feature(FW_FEATURE_ISERIES) &&
 722                         cpu_has_feature(CPU_FTR_SMT))
 723                 sysdev_remove_file(s, &attr_smt_snooze_delay);
 724 #endif
 725
 726         /* PMC stuff */
 727         switch (cur_cpu_spec->pmc_type) {
 728 #ifdef HAS_PPC_PMC_IBM
 729         case PPC_PMC_IBM:
 730                 attrs = ibm_common_attrs;
 731                 nattrs = sizeof(ibm_common_attrs) / sizeof(struct sysdev_attribute);
 732                 pmc_attrs = classic_pmc_attrs;
 733                 break;
 734 #endif /* HAS_PPC_PMC_IBM */
 735 #ifdef HAS_PPC_PMC_G4
 736         case PPC_PMC_G4:
 737                 attrs = g4_common_attrs;
 738                 nattrs = sizeof(g4_common_attrs) / sizeof(struct sysdev_attribute);
 739                 pmc_attrs = classic_pmc_attrs;
 740                 break;
 741 #endif /* HAS_PPC_PMC_G4 */
 742 #ifdef HAS_PPC_PMC_PA6T
 743         case PPC_PMC_PA6T:
 744                 /* PA Semi starts counting at PMC0 */
 745                 attrs = pa6t_attrs;
 746                 nattrs = sizeof(pa6t_attrs) / sizeof(struct sysdev_attribute);
 747                 pmc_attrs = NULL;
 748                 break;
 749 #endif /* HAS_PPC_PMC_PA6T */
 750         default:
 751                 attrs = NULL;
 752                 nattrs = 0;
 753                 pmc_attrs = NULL;
 754         }
 755
 756         for (i = 0; i < nattrs; i++)
 757                 sysdev_remove_file(s, &attrs[i]);
 758
 759         if (pmc_attrs)
 760                 for (i = 0; i < cur_cpu_spec->num_pmcs; i++)
 761                         sysdev_remove_file(s, &pmc_attrs[i]);
 762
 763 #ifdef CONFIG_PPC64
 764         if (cpu_has_feature(CPU_FTR_MMCRA))
 765                 sysdev_remove_file(s, &attr_mmcra);
 766
 767         if (cpu_has_feature(CPU_FTR_PURR))
 768                 sysdev_remove_file(s, &attr_purr);
 769
 770         if (cpu_has_feature(CPU_FTR_SPURR))
 771                 sysdev_remove_file(s, &attr_spurr);
 772
 773         if (cpu_has_feature(CPU_FTR_DSCR))
 774                 sysdev_remove_file(s, &attr_dscr);
 775 #endif /* CONFIG_PPC64 */
 776
 777         remove_cache_info(s);
 778 }
 779 #endif /* CONFIG_HOTPLUG_CPU */
 780
 781 static int __cpuinit sysfs_cpu_notify(struct notifier_block *self,
 782                                       unsigned long action, void *hcpu)
 783 {
 784         unsigned int cpu = (unsigned int)(long)hcpu;
 785
 786         switch (action) {
 787         case CPU_ONLINE:
 788         case CPU_ONLINE_FROZEN:
 789                 register_cpu_online(cpu);
 790                 break;
 791 #ifdef CONFIG_HOTPLUG_CPU
 792         case CPU_DEAD:
 793         case CPU_DEAD_FROZEN:
 794                 unregister_cpu_online(cpu);
 795                 break;
 796 #endif
 797         }
 798         return NOTIFY_OK;
 799 }
 800
 801 static struct notifier_block __cpuinitdata sysfs_cpu_nb = {
 802         .notifier_call  = sysfs_cpu_notify,
 803 };
 804
 805 static DEFINE_MUTEX(cpu_mutex);
 806
 807 int cpu_add_sysdev_attr(struct sysdev_attribute *attr)
 808 {
 809         int cpu;
 810
 811         mutex_lock(&cpu_mutex);
 812
 813         for_each_possible_cpu(cpu) {
 814                 sysdev_create_file(get_cpu_sysdev(cpu), attr);
 815         }
 816
 817         mutex_unlock(&cpu_mutex);
 818         return 0;
 819 }
 820 EXPORT_SYMBOL_GPL(cpu_add_sysdev_attr);
 821
 822 int cpu_add_sysdev_attr_group(struct attribute_group *attrs)
 823 {
 824         int cpu;
 825         struct sys_device *sysdev;
 826         int ret;
 827
 828         mutex_lock(&cpu_mutex);
 829
 830         for_each_possible_cpu(cpu) {
 831                 sysdev = get_cpu_sysdev(cpu);
 832                 ret = sysfs_create_group(&sysdev->kobj, attrs);
 833                 WARN_ON(ret != 0);
 834         }
 835
 836         mutex_unlock(&cpu_mutex);
 837         return 0;
 838 }
 839 EXPORT_SYMBOL_GPL(cpu_add_sysdev_attr_group);
 840
 841
 842 void cpu_remove_sysdev_attr(struct sysdev_attribute *attr)
 843 {
 844         int cpu;
 845
 846         mutex_lock(&cpu_mutex);
 847
 848         for_each_possible_cpu(cpu) {
 849                 sysdev_remove_file(get_cpu_sysdev(cpu), attr);
 850         }
 851
 852         mutex_unlock(&cpu_mutex);
 853 }
 854 EXPORT_SYMBOL_GPL(cpu_remove_sysdev_attr);
 855
 856 void cpu_remove_sysdev_attr_group(struct attribute_group *attrs)
 857 {
 858         int cpu;
 859         struct sys_device *sysdev;
 860
 861         mutex_lock(&cpu_mutex);
 862
 863         for_each_possible_cpu(cpu) {
 864                 sysdev = get_cpu_sysdev(cpu);
 865                 sysfs_remove_group(&sysdev->kobj, attrs);
 866         }
 867
 868         mutex_unlock(&cpu_mutex);
 869 }
 870 EXPORT_SYMBOL_GPL(cpu_remove_sysdev_attr_group);
 871
 872
 873 /* NUMA stuff */
 874
 875 #ifdef CONFIG_NUMA
 876 static void register_nodes(void)
 877 {
 878         int i;
 879
 880         for (i = 0; i < MAX_NUMNODES; i++)
 881                 register_one_node(i);
 882 }
 883
 884 int sysfs_add_device_to_node(struct sys_device *dev, int nid)
 885 {
 886         struct node *node = &node_devices[nid];
 887         return sysfs_create_link(&node->sysdev.kobj, &dev->kobj,
 888                         kobject_name(&dev->kobj));
 889 }
 890 EXPORT_SYMBOL_GPL(sysfs_add_device_to_node);
 891
 892 void sysfs_remove_device_from_node(struct sys_device *dev, int nid)
 893 {
 894         struct node *node = &node_devices[nid];
 895         sysfs_remove_link(&node->sysdev.kobj, kobject_name(&dev->kobj));
 896 }
 897 EXPORT_SYMBOL_GPL(sysfs_remove_device_from_node);
 898
 899 #else
 900 static void register_nodes(void)
 901 {
 902         return;
 903 }
 904
 905 #endif
 906
 907 /* Only valid if CPU is present. */
 908 static ssize_t show_physical_id(struct sys_device *dev,
 909                                 struct sysdev_attribute *attr, char *buf)
 910 {
 911         struct cpu *cpu = container_of(dev, struct cpu, sysdev);
 912
 913         return sprintf(buf, "%d\n", get_hard_smp_processor_id(cpu->sysdev.id));
 914 }
 915 static SYSDEV_ATTR(physical_id, 0444, show_physical_id, NULL);
 916
 917 static int __init topology_init(void)
 918 {
 919         int cpu;
 920
 921         register_nodes();
 922         register_cpu_notifier(&sysfs_cpu_nb);
 923
 924         for_each_possible_cpu(cpu) {
 925                 struct cpu *c = &per_cpu(cpu_devices, cpu);
 926
 927                 /*
 928                  * For now, we just see if the system supports making
 929                  * the RTAS calls for CPU hotplug.  But, there may be a
 930                  * more comprehensive way to do this for an individual
 931                  * CPU.  For instance, the boot cpu might never be valid
 932                  * for hotplugging.
 933                  */
 934                 if (ppc_md.cpu_die)
 935                         c->hotpluggable = 1;
 936
 937                 if (cpu_online(cpu) || c->hotpluggable) {
 938                         register_cpu(c, cpu);
 939
 940                         sysdev_create_file(&c->sysdev, &attr_physical_id);
 941                 }
 942
 943                 if (cpu_online(cpu))
 944                         register_cpu_online(cpu);
 945         }
 946
 947         return 0;
 948 }
 949 subsys_initcall(topology_init);