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 if (!firmware_has_feature(FW_FEATURE_ISERIES) && 721 cpu_has_feature(CPU_FTR_SMT)) 722 sysdev_remove_file(s, &attr_smt_snooze_delay); 723 724 /* PMC stuff */ 725 switch (cur_cpu_spec->pmc_type) { 726 #ifdef HAS_PPC_PMC_IBM 727 case PPC_PMC_IBM: 728 attrs = ibm_common_attrs; 729 nattrs = sizeof(ibm_common_attrs) / sizeof(struct sysdev_attribute); 730 pmc_attrs = classic_pmc_attrs; 731 break; 732 #endif /* HAS_PPC_PMC_IBM */ 733 #ifdef HAS_PPC_PMC_G4 734 case PPC_PMC_G4: 735 attrs = g4_common_attrs; 736 nattrs = sizeof(g4_common_attrs) / sizeof(struct sysdev_attribute); 737 pmc_attrs = classic_pmc_attrs; 738 break; 739 #endif /* HAS_PPC_PMC_G4 */ 740 #ifdef HAS_PPC_PMC_PA6T 741 case PPC_PMC_PA6T: 742 /* PA Semi starts counting at PMC0 */ 743 attrs = pa6t_attrs; 744 nattrs = sizeof(pa6t_attrs) / sizeof(struct sysdev_attribute); 745 pmc_attrs = NULL; 746 break; 747 #endif /* HAS_PPC_PMC_PA6T */ 748 default: 749 attrs = NULL; 750 nattrs = 0; 751 pmc_attrs = NULL; 752 } 753 754 for (i = 0; i < nattrs; i++) 755 sysdev_remove_file(s, &attrs[i]); 756 757 if (pmc_attrs) 758 for (i = 0; i < cur_cpu_spec->num_pmcs; i++) 759 sysdev_remove_file(s, &pmc_attrs[i]); 760 761 #ifdef CONFIG_PPC64 762 if (cpu_has_feature(CPU_FTR_MMCRA)) 763 sysdev_remove_file(s, &attr_mmcra); 764 765 if (cpu_has_feature(CPU_FTR_PURR)) 766 sysdev_remove_file(s, &attr_purr); 767 768 if (cpu_has_feature(CPU_FTR_SPURR)) 769 sysdev_remove_file(s, &attr_spurr); 770 771 if (cpu_has_feature(CPU_FTR_DSCR)) 772 sysdev_remove_file(s, &attr_dscr); 773 #endif /* CONFIG_PPC64 */ 774 775 remove_cache_info(s); 776 } 777 #endif /* CONFIG_HOTPLUG_CPU */ 778 779 static int __cpuinit sysfs_cpu_notify(struct notifier_block *self, 780 unsigned long action, void *hcpu) 781 { 782 unsigned int cpu = (unsigned int)(long)hcpu; 783 784 switch (action) { 785 case CPU_ONLINE: 786 case CPU_ONLINE_FROZEN: 787 register_cpu_online(cpu); 788 break; 789 #ifdef CONFIG_HOTPLUG_CPU 790 case CPU_DEAD: 791 case CPU_DEAD_FROZEN: 792 unregister_cpu_online(cpu); 793 break; 794 #endif 795 } 796 return NOTIFY_OK; 797 } 798 799 static struct notifier_block __cpuinitdata sysfs_cpu_nb = { 800 .notifier_call = sysfs_cpu_notify, 801 }; 802 803 static DEFINE_MUTEX(cpu_mutex); 804 805 int cpu_add_sysdev_attr(struct sysdev_attribute *attr) 806 { 807 int cpu; 808 809 mutex_lock(&cpu_mutex); 810 811 for_each_possible_cpu(cpu) { 812 sysdev_create_file(get_cpu_sysdev(cpu), attr); 813 } 814 815 mutex_unlock(&cpu_mutex); 816 return 0; 817 } 818 EXPORT_SYMBOL_GPL(cpu_add_sysdev_attr); 819 820 int cpu_add_sysdev_attr_group(struct attribute_group *attrs) 821 { 822 int cpu; 823 struct sys_device *sysdev; 824 int ret; 825 826 mutex_lock(&cpu_mutex); 827 828 for_each_possible_cpu(cpu) { 829 sysdev = get_cpu_sysdev(cpu); 830 ret = sysfs_create_group(&sysdev->kobj, attrs); 831 WARN_ON(ret != 0); 832 } 833 834 mutex_unlock(&cpu_mutex); 835 return 0; 836 } 837 EXPORT_SYMBOL_GPL(cpu_add_sysdev_attr_group); 838 839 840 void cpu_remove_sysdev_attr(struct sysdev_attribute *attr) 841 { 842 int cpu; 843 844 mutex_lock(&cpu_mutex); 845 846 for_each_possible_cpu(cpu) { 847 sysdev_remove_file(get_cpu_sysdev(cpu), attr); 848 } 849 850 mutex_unlock(&cpu_mutex); 851 } 852 EXPORT_SYMBOL_GPL(cpu_remove_sysdev_attr); 853 854 void cpu_remove_sysdev_attr_group(struct attribute_group *attrs) 855 { 856 int cpu; 857 struct sys_device *sysdev; 858 859 mutex_lock(&cpu_mutex); 860 861 for_each_possible_cpu(cpu) { 862 sysdev = get_cpu_sysdev(cpu); 863 sysfs_remove_group(&sysdev->kobj, attrs); 864 } 865 866 mutex_unlock(&cpu_mutex); 867 } 868 EXPORT_SYMBOL_GPL(cpu_remove_sysdev_attr_group); 869 870 871 /* NUMA stuff */ 872 873 #ifdef CONFIG_NUMA 874 static void register_nodes(void) 875 { 876 int i; 877 878 for (i = 0; i < MAX_NUMNODES; i++) 879 register_one_node(i); 880 } 881 882 int sysfs_add_device_to_node(struct sys_device *dev, int nid) 883 { 884 struct node *node = &node_devices[nid]; 885 return sysfs_create_link(&node->sysdev.kobj, &dev->kobj, 886 kobject_name(&dev->kobj)); 887 } 888 EXPORT_SYMBOL_GPL(sysfs_add_device_to_node); 889 890 void sysfs_remove_device_from_node(struct sys_device *dev, int nid) 891 { 892 struct node *node = &node_devices[nid]; 893 sysfs_remove_link(&node->sysdev.kobj, kobject_name(&dev->kobj)); 894 } 895 EXPORT_SYMBOL_GPL(sysfs_remove_device_from_node); 896 897 #else 898 static void register_nodes(void) 899 { 900 return; 901 } 902 903 #endif 904 905 /* Only valid if CPU is present. */ 906 static ssize_t show_physical_id(struct sys_device *dev, 907 struct sysdev_attribute *attr, char *buf) 908 { 909 struct cpu *cpu = container_of(dev, struct cpu, sysdev); 910 911 return sprintf(buf, "%d\n", get_hard_smp_processor_id(cpu->sysdev.id)); 912 } 913 static SYSDEV_ATTR(physical_id, 0444, show_physical_id, NULL); 914 915 static int __init topology_init(void) 916 { 917 int cpu; 918 919 register_nodes(); 920 register_cpu_notifier(&sysfs_cpu_nb); 921 922 for_each_possible_cpu(cpu) { 923 struct cpu *c = &per_cpu(cpu_devices, cpu); 924 925 /* 926 * For now, we just see if the system supports making 927 * the RTAS calls for CPU hotplug. But, there may be a 928 * more comprehensive way to do this for an individual 929 * CPU. For instance, the boot cpu might never be valid 930 * for hotplugging. 931 */ 932 if (ppc_md.cpu_die) 933 c->hotpluggable = 1; 934 935 if (cpu_online(cpu) || c->hotpluggable) { 936 register_cpu(c, cpu); 937 938 sysdev_create_file(&c->sysdev, &attr_physical_id); 939 } 940 941 if (cpu_online(cpu)) 942 register_cpu_online(cpu); 943 } 944 945 return 0; 946 } 947 subsys_initcall(topology_init); 948