1 #include <linux/device.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/export.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/hvcall.h> 16 #include <asm/prom.h> 17 #include <asm/machdep.h> 18 #include <asm/smp.h> 19 #include <asm/pmc.h> 20 21 #include "cacheinfo.h" 22 23 #ifdef CONFIG_PPC64 24 #include <asm/paca.h> 25 #include <asm/lppaca.h> 26 #endif 27 28 static DEFINE_PER_CPU(struct cpu, cpu_devices); 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(long, smt_snooze_delay) = { 100 }; 38 39 static ssize_t store_smt_snooze_delay(struct device *dev, 40 struct device_attribute *attr, 41 const char *buf, 42 size_t count) 43 { 44 struct cpu *cpu = container_of(dev, struct cpu, dev); 45 ssize_t ret; 46 long snooze; 47 48 ret = sscanf(buf, "%ld", &snooze); 49 if (ret != 1) 50 return -EINVAL; 51 52 per_cpu(smt_snooze_delay, cpu->dev.id) = snooze; 53 update_smt_snooze_delay(snooze); 54 55 return count; 56 } 57 58 static ssize_t show_smt_snooze_delay(struct device *dev, 59 struct device_attribute *attr, 60 char *buf) 61 { 62 struct cpu *cpu = container_of(dev, struct cpu, dev); 63 64 return sprintf(buf, "%ld\n", per_cpu(smt_snooze_delay, cpu->dev.id)); 65 } 66 67 static DEVICE_ATTR(smt_snooze_delay, 0644, show_smt_snooze_delay, 68 store_smt_snooze_delay); 69 70 static int __init setup_smt_snooze_delay(char *str) 71 { 72 unsigned int cpu; 73 long snooze; 74 75 if (!cpu_has_feature(CPU_FTR_SMT)) 76 return 1; 77 78 snooze = simple_strtol(str, NULL, 10); 79 for_each_possible_cpu(cpu) 80 per_cpu(smt_snooze_delay, cpu) = snooze; 81 82 return 1; 83 } 84 __setup("smt-snooze-delay=", setup_smt_snooze_delay); 85 86 #endif /* CONFIG_PPC64 */ 87 88 /* 89 * Enabling PMCs will slow partition context switch times so we only do 90 * it the first time we write to the PMCs. 91 */ 92 93 static DEFINE_PER_CPU(char, pmcs_enabled); 94 95 void ppc_enable_pmcs(void) 96 { 97 ppc_set_pmu_inuse(1); 98 99 /* Only need to enable them once */ 100 if (__get_cpu_var(pmcs_enabled)) 101 return; 102 103 __get_cpu_var(pmcs_enabled) = 1; 104 105 if (ppc_md.enable_pmcs) 106 ppc_md.enable_pmcs(); 107 } 108 EXPORT_SYMBOL(ppc_enable_pmcs); 109 110 #define SYSFS_PMCSETUP(NAME, ADDRESS) \ 111 static void read_##NAME(void *val) \ 112 { \ 113 *(unsigned long *)val = mfspr(ADDRESS); \ 114 } \ 115 static void write_##NAME(void *val) \ 116 { \ 117 ppc_enable_pmcs(); \ 118 mtspr(ADDRESS, *(unsigned long *)val); \ 119 } \ 120 static ssize_t show_##NAME(struct device *dev, \ 121 struct device_attribute *attr, \ 122 char *buf) \ 123 { \ 124 struct cpu *cpu = container_of(dev, struct cpu, dev); \ 125 unsigned long val; \ 126 smp_call_function_single(cpu->dev.id, read_##NAME, &val, 1); \ 127 return sprintf(buf, "%lx\n", val); \ 128 } \ 129 static ssize_t __used \ 130 store_##NAME(struct device *dev, struct device_attribute *attr, \ 131 const char *buf, size_t count) \ 132 { \ 133 struct cpu *cpu = container_of(dev, struct cpu, dev); \ 134 unsigned long val; \ 135 int ret = sscanf(buf, "%lx", &val); \ 136 if (ret != 1) \ 137 return -EINVAL; \ 138 smp_call_function_single(cpu->dev.id, write_##NAME, &val, 1); \ 139 return count; \ 140 } 141 142 143 /* Let's define all possible registers, we'll only hook up the ones 144 * that are implemented on the current processor 145 */ 146 147 #if defined(CONFIG_PPC64) 148 #define HAS_PPC_PMC_CLASSIC 1 149 #define HAS_PPC_PMC_IBM 1 150 #define HAS_PPC_PMC_PA6T 1 151 #elif defined(CONFIG_6xx) 152 #define HAS_PPC_PMC_CLASSIC 1 153 #define HAS_PPC_PMC_IBM 1 154 #define HAS_PPC_PMC_G4 1 155 #endif 156 157 158 #ifdef HAS_PPC_PMC_CLASSIC 159 SYSFS_PMCSETUP(mmcr0, SPRN_MMCR0); 160 SYSFS_PMCSETUP(mmcr1, SPRN_MMCR1); 161 SYSFS_PMCSETUP(pmc1, SPRN_PMC1); 162 SYSFS_PMCSETUP(pmc2, SPRN_PMC2); 163 SYSFS_PMCSETUP(pmc3, SPRN_PMC3); 164 SYSFS_PMCSETUP(pmc4, SPRN_PMC4); 165 SYSFS_PMCSETUP(pmc5, SPRN_PMC5); 166 SYSFS_PMCSETUP(pmc6, SPRN_PMC6); 167 168 #ifdef HAS_PPC_PMC_G4 169 SYSFS_PMCSETUP(mmcr2, SPRN_MMCR2); 170 #endif 171 172 #ifdef CONFIG_PPC64 173 SYSFS_PMCSETUP(pmc7, SPRN_PMC7); 174 SYSFS_PMCSETUP(pmc8, SPRN_PMC8); 175 176 SYSFS_PMCSETUP(mmcra, SPRN_MMCRA); 177 SYSFS_PMCSETUP(purr, SPRN_PURR); 178 SYSFS_PMCSETUP(spurr, SPRN_SPURR); 179 SYSFS_PMCSETUP(dscr, SPRN_DSCR); 180 SYSFS_PMCSETUP(pir, SPRN_PIR); 181 182 static DEVICE_ATTR(mmcra, 0600, show_mmcra, store_mmcra); 183 static DEVICE_ATTR(spurr, 0600, show_spurr, NULL); 184 static DEVICE_ATTR(dscr, 0600, show_dscr, store_dscr); 185 static DEVICE_ATTR(purr, 0600, show_purr, store_purr); 186 static DEVICE_ATTR(pir, 0400, show_pir, NULL); 187 188 unsigned long dscr_default = 0; 189 EXPORT_SYMBOL(dscr_default); 190 191 static ssize_t show_dscr_default(struct device *dev, 192 struct device_attribute *attr, char *buf) 193 { 194 return sprintf(buf, "%lx\n", dscr_default); 195 } 196 197 static ssize_t __used store_dscr_default(struct device *dev, 198 struct device_attribute *attr, const char *buf, 199 size_t count) 200 { 201 unsigned long val; 202 int ret = 0; 203 204 ret = sscanf(buf, "%lx", &val); 205 if (ret != 1) 206 return -EINVAL; 207 dscr_default = val; 208 209 return count; 210 } 211 212 static DEVICE_ATTR(dscr_default, 0600, 213 show_dscr_default, store_dscr_default); 214 215 static void sysfs_create_dscr_default(void) 216 { 217 int err = 0; 218 if (cpu_has_feature(CPU_FTR_DSCR)) 219 err = device_create_file(cpu_subsys.dev_root, &dev_attr_dscr_default); 220 } 221 #endif /* CONFIG_PPC64 */ 222 223 #ifdef HAS_PPC_PMC_PA6T 224 SYSFS_PMCSETUP(pa6t_pmc0, SPRN_PA6T_PMC0); 225 SYSFS_PMCSETUP(pa6t_pmc1, SPRN_PA6T_PMC1); 226 SYSFS_PMCSETUP(pa6t_pmc2, SPRN_PA6T_PMC2); 227 SYSFS_PMCSETUP(pa6t_pmc3, SPRN_PA6T_PMC3); 228 SYSFS_PMCSETUP(pa6t_pmc4, SPRN_PA6T_PMC4); 229 SYSFS_PMCSETUP(pa6t_pmc5, SPRN_PA6T_PMC5); 230 #ifdef CONFIG_DEBUG_KERNEL 231 SYSFS_PMCSETUP(hid0, SPRN_HID0); 232 SYSFS_PMCSETUP(hid1, SPRN_HID1); 233 SYSFS_PMCSETUP(hid4, SPRN_HID4); 234 SYSFS_PMCSETUP(hid5, SPRN_HID5); 235 SYSFS_PMCSETUP(ima0, SPRN_PA6T_IMA0); 236 SYSFS_PMCSETUP(ima1, SPRN_PA6T_IMA1); 237 SYSFS_PMCSETUP(ima2, SPRN_PA6T_IMA2); 238 SYSFS_PMCSETUP(ima3, SPRN_PA6T_IMA3); 239 SYSFS_PMCSETUP(ima4, SPRN_PA6T_IMA4); 240 SYSFS_PMCSETUP(ima5, SPRN_PA6T_IMA5); 241 SYSFS_PMCSETUP(ima6, SPRN_PA6T_IMA6); 242 SYSFS_PMCSETUP(ima7, SPRN_PA6T_IMA7); 243 SYSFS_PMCSETUP(ima8, SPRN_PA6T_IMA8); 244 SYSFS_PMCSETUP(ima9, SPRN_PA6T_IMA9); 245 SYSFS_PMCSETUP(imaat, SPRN_PA6T_IMAAT); 246 SYSFS_PMCSETUP(btcr, SPRN_PA6T_BTCR); 247 SYSFS_PMCSETUP(pccr, SPRN_PA6T_PCCR); 248 SYSFS_PMCSETUP(rpccr, SPRN_PA6T_RPCCR); 249 SYSFS_PMCSETUP(der, SPRN_PA6T_DER); 250 SYSFS_PMCSETUP(mer, SPRN_PA6T_MER); 251 SYSFS_PMCSETUP(ber, SPRN_PA6T_BER); 252 SYSFS_PMCSETUP(ier, SPRN_PA6T_IER); 253 SYSFS_PMCSETUP(sier, SPRN_PA6T_SIER); 254 SYSFS_PMCSETUP(siar, SPRN_PA6T_SIAR); 255 SYSFS_PMCSETUP(tsr0, SPRN_PA6T_TSR0); 256 SYSFS_PMCSETUP(tsr1, SPRN_PA6T_TSR1); 257 SYSFS_PMCSETUP(tsr2, SPRN_PA6T_TSR2); 258 SYSFS_PMCSETUP(tsr3, SPRN_PA6T_TSR3); 259 #endif /* CONFIG_DEBUG_KERNEL */ 260 #endif /* HAS_PPC_PMC_PA6T */ 261 262 #ifdef HAS_PPC_PMC_IBM 263 static struct device_attribute ibm_common_attrs[] = { 264 __ATTR(mmcr0, 0600, show_mmcr0, store_mmcr0), 265 __ATTR(mmcr1, 0600, show_mmcr1, store_mmcr1), 266 }; 267 #endif /* HAS_PPC_PMC_G4 */ 268 269 #ifdef HAS_PPC_PMC_G4 270 static struct device_attribute g4_common_attrs[] = { 271 __ATTR(mmcr0, 0600, show_mmcr0, store_mmcr0), 272 __ATTR(mmcr1, 0600, show_mmcr1, store_mmcr1), 273 __ATTR(mmcr2, 0600, show_mmcr2, store_mmcr2), 274 }; 275 #endif /* HAS_PPC_PMC_G4 */ 276 277 static struct device_attribute classic_pmc_attrs[] = { 278 __ATTR(pmc1, 0600, show_pmc1, store_pmc1), 279 __ATTR(pmc2, 0600, show_pmc2, store_pmc2), 280 __ATTR(pmc3, 0600, show_pmc3, store_pmc3), 281 __ATTR(pmc4, 0600, show_pmc4, store_pmc4), 282 __ATTR(pmc5, 0600, show_pmc5, store_pmc5), 283 __ATTR(pmc6, 0600, show_pmc6, store_pmc6), 284 #ifdef CONFIG_PPC64 285 __ATTR(pmc7, 0600, show_pmc7, store_pmc7), 286 __ATTR(pmc8, 0600, show_pmc8, store_pmc8), 287 #endif 288 }; 289 290 #ifdef HAS_PPC_PMC_PA6T 291 static struct device_attribute pa6t_attrs[] = { 292 __ATTR(mmcr0, 0600, show_mmcr0, store_mmcr0), 293 __ATTR(mmcr1, 0600, show_mmcr1, store_mmcr1), 294 __ATTR(pmc0, 0600, show_pa6t_pmc0, store_pa6t_pmc0), 295 __ATTR(pmc1, 0600, show_pa6t_pmc1, store_pa6t_pmc1), 296 __ATTR(pmc2, 0600, show_pa6t_pmc2, store_pa6t_pmc2), 297 __ATTR(pmc3, 0600, show_pa6t_pmc3, store_pa6t_pmc3), 298 __ATTR(pmc4, 0600, show_pa6t_pmc4, store_pa6t_pmc4), 299 __ATTR(pmc5, 0600, show_pa6t_pmc5, store_pa6t_pmc5), 300 #ifdef CONFIG_DEBUG_KERNEL 301 __ATTR(hid0, 0600, show_hid0, store_hid0), 302 __ATTR(hid1, 0600, show_hid1, store_hid1), 303 __ATTR(hid4, 0600, show_hid4, store_hid4), 304 __ATTR(hid5, 0600, show_hid5, store_hid5), 305 __ATTR(ima0, 0600, show_ima0, store_ima0), 306 __ATTR(ima1, 0600, show_ima1, store_ima1), 307 __ATTR(ima2, 0600, show_ima2, store_ima2), 308 __ATTR(ima3, 0600, show_ima3, store_ima3), 309 __ATTR(ima4, 0600, show_ima4, store_ima4), 310 __ATTR(ima5, 0600, show_ima5, store_ima5), 311 __ATTR(ima6, 0600, show_ima6, store_ima6), 312 __ATTR(ima7, 0600, show_ima7, store_ima7), 313 __ATTR(ima8, 0600, show_ima8, store_ima8), 314 __ATTR(ima9, 0600, show_ima9, store_ima9), 315 __ATTR(imaat, 0600, show_imaat, store_imaat), 316 __ATTR(btcr, 0600, show_btcr, store_btcr), 317 __ATTR(pccr, 0600, show_pccr, store_pccr), 318 __ATTR(rpccr, 0600, show_rpccr, store_rpccr), 319 __ATTR(der, 0600, show_der, store_der), 320 __ATTR(mer, 0600, show_mer, store_mer), 321 __ATTR(ber, 0600, show_ber, store_ber), 322 __ATTR(ier, 0600, show_ier, store_ier), 323 __ATTR(sier, 0600, show_sier, store_sier), 324 __ATTR(siar, 0600, show_siar, store_siar), 325 __ATTR(tsr0, 0600, show_tsr0, store_tsr0), 326 __ATTR(tsr1, 0600, show_tsr1, store_tsr1), 327 __ATTR(tsr2, 0600, show_tsr2, store_tsr2), 328 __ATTR(tsr3, 0600, show_tsr3, store_tsr3), 329 #endif /* CONFIG_DEBUG_KERNEL */ 330 }; 331 #endif /* HAS_PPC_PMC_PA6T */ 332 #endif /* HAS_PPC_PMC_CLASSIC */ 333 334 static void __cpuinit register_cpu_online(unsigned int cpu) 335 { 336 struct cpu *c = &per_cpu(cpu_devices, cpu); 337 struct device *s = &c->dev; 338 struct device_attribute *attrs, *pmc_attrs; 339 int i, nattrs; 340 341 #ifdef CONFIG_PPC64 342 if (cpu_has_feature(CPU_FTR_SMT)) 343 device_create_file(s, &dev_attr_smt_snooze_delay); 344 #endif 345 346 /* PMC stuff */ 347 switch (cur_cpu_spec->pmc_type) { 348 #ifdef HAS_PPC_PMC_IBM 349 case PPC_PMC_IBM: 350 attrs = ibm_common_attrs; 351 nattrs = sizeof(ibm_common_attrs) / sizeof(struct device_attribute); 352 pmc_attrs = classic_pmc_attrs; 353 break; 354 #endif /* HAS_PPC_PMC_IBM */ 355 #ifdef HAS_PPC_PMC_G4 356 case PPC_PMC_G4: 357 attrs = g4_common_attrs; 358 nattrs = sizeof(g4_common_attrs) / sizeof(struct device_attribute); 359 pmc_attrs = classic_pmc_attrs; 360 break; 361 #endif /* HAS_PPC_PMC_G4 */ 362 #ifdef HAS_PPC_PMC_PA6T 363 case PPC_PMC_PA6T: 364 /* PA Semi starts counting at PMC0 */ 365 attrs = pa6t_attrs; 366 nattrs = sizeof(pa6t_attrs) / sizeof(struct device_attribute); 367 pmc_attrs = NULL; 368 break; 369 #endif /* HAS_PPC_PMC_PA6T */ 370 default: 371 attrs = NULL; 372 nattrs = 0; 373 pmc_attrs = NULL; 374 } 375 376 for (i = 0; i < nattrs; i++) 377 device_create_file(s, &attrs[i]); 378 379 if (pmc_attrs) 380 for (i = 0; i < cur_cpu_spec->num_pmcs; i++) 381 device_create_file(s, &pmc_attrs[i]); 382 383 #ifdef CONFIG_PPC64 384 if (cpu_has_feature(CPU_FTR_MMCRA)) 385 device_create_file(s, &dev_attr_mmcra); 386 387 if (cpu_has_feature(CPU_FTR_PURR)) 388 device_create_file(s, &dev_attr_purr); 389 390 if (cpu_has_feature(CPU_FTR_SPURR)) 391 device_create_file(s, &dev_attr_spurr); 392 393 if (cpu_has_feature(CPU_FTR_DSCR)) 394 device_create_file(s, &dev_attr_dscr); 395 396 if (cpu_has_feature(CPU_FTR_PPCAS_ARCH_V2)) 397 device_create_file(s, &dev_attr_pir); 398 #endif /* CONFIG_PPC64 */ 399 400 cacheinfo_cpu_online(cpu); 401 } 402 403 #ifdef CONFIG_HOTPLUG_CPU 404 static void unregister_cpu_online(unsigned int cpu) 405 { 406 struct cpu *c = &per_cpu(cpu_devices, cpu); 407 struct device *s = &c->dev; 408 struct device_attribute *attrs, *pmc_attrs; 409 int i, nattrs; 410 411 BUG_ON(!c->hotpluggable); 412 413 #ifdef CONFIG_PPC64 414 if (cpu_has_feature(CPU_FTR_SMT)) 415 device_remove_file(s, &dev_attr_smt_snooze_delay); 416 #endif 417 418 /* PMC stuff */ 419 switch (cur_cpu_spec->pmc_type) { 420 #ifdef HAS_PPC_PMC_IBM 421 case PPC_PMC_IBM: 422 attrs = ibm_common_attrs; 423 nattrs = sizeof(ibm_common_attrs) / sizeof(struct device_attribute); 424 pmc_attrs = classic_pmc_attrs; 425 break; 426 #endif /* HAS_PPC_PMC_IBM */ 427 #ifdef HAS_PPC_PMC_G4 428 case PPC_PMC_G4: 429 attrs = g4_common_attrs; 430 nattrs = sizeof(g4_common_attrs) / sizeof(struct device_attribute); 431 pmc_attrs = classic_pmc_attrs; 432 break; 433 #endif /* HAS_PPC_PMC_G4 */ 434 #ifdef HAS_PPC_PMC_PA6T 435 case PPC_PMC_PA6T: 436 /* PA Semi starts counting at PMC0 */ 437 attrs = pa6t_attrs; 438 nattrs = sizeof(pa6t_attrs) / sizeof(struct device_attribute); 439 pmc_attrs = NULL; 440 break; 441 #endif /* HAS_PPC_PMC_PA6T */ 442 default: 443 attrs = NULL; 444 nattrs = 0; 445 pmc_attrs = NULL; 446 } 447 448 for (i = 0; i < nattrs; i++) 449 device_remove_file(s, &attrs[i]); 450 451 if (pmc_attrs) 452 for (i = 0; i < cur_cpu_spec->num_pmcs; i++) 453 device_remove_file(s, &pmc_attrs[i]); 454 455 #ifdef CONFIG_PPC64 456 if (cpu_has_feature(CPU_FTR_MMCRA)) 457 device_remove_file(s, &dev_attr_mmcra); 458 459 if (cpu_has_feature(CPU_FTR_PURR)) 460 device_remove_file(s, &dev_attr_purr); 461 462 if (cpu_has_feature(CPU_FTR_SPURR)) 463 device_remove_file(s, &dev_attr_spurr); 464 465 if (cpu_has_feature(CPU_FTR_DSCR)) 466 device_remove_file(s, &dev_attr_dscr); 467 468 if (cpu_has_feature(CPU_FTR_PPCAS_ARCH_V2)) 469 device_remove_file(s, &dev_attr_pir); 470 #endif /* CONFIG_PPC64 */ 471 472 cacheinfo_cpu_offline(cpu); 473 } 474 475 #ifdef CONFIG_ARCH_CPU_PROBE_RELEASE 476 ssize_t arch_cpu_probe(const char *buf, size_t count) 477 { 478 if (ppc_md.cpu_probe) 479 return ppc_md.cpu_probe(buf, count); 480 481 return -EINVAL; 482 } 483 484 ssize_t arch_cpu_release(const char *buf, size_t count) 485 { 486 if (ppc_md.cpu_release) 487 return ppc_md.cpu_release(buf, count); 488 489 return -EINVAL; 490 } 491 #endif /* CONFIG_ARCH_CPU_PROBE_RELEASE */ 492 493 #endif /* CONFIG_HOTPLUG_CPU */ 494 495 static int __cpuinit sysfs_cpu_notify(struct notifier_block *self, 496 unsigned long action, void *hcpu) 497 { 498 unsigned int cpu = (unsigned int)(long)hcpu; 499 500 switch (action) { 501 case CPU_ONLINE: 502 case CPU_ONLINE_FROZEN: 503 register_cpu_online(cpu); 504 break; 505 #ifdef CONFIG_HOTPLUG_CPU 506 case CPU_DEAD: 507 case CPU_DEAD_FROZEN: 508 unregister_cpu_online(cpu); 509 break; 510 #endif 511 } 512 return NOTIFY_OK; 513 } 514 515 static struct notifier_block __cpuinitdata sysfs_cpu_nb = { 516 .notifier_call = sysfs_cpu_notify, 517 }; 518 519 static DEFINE_MUTEX(cpu_mutex); 520 521 int cpu_add_dev_attr(struct device_attribute *attr) 522 { 523 int cpu; 524 525 mutex_lock(&cpu_mutex); 526 527 for_each_possible_cpu(cpu) { 528 device_create_file(get_cpu_device(cpu), attr); 529 } 530 531 mutex_unlock(&cpu_mutex); 532 return 0; 533 } 534 EXPORT_SYMBOL_GPL(cpu_add_dev_attr); 535 536 int cpu_add_dev_attr_group(struct attribute_group *attrs) 537 { 538 int cpu; 539 struct device *dev; 540 int ret; 541 542 mutex_lock(&cpu_mutex); 543 544 for_each_possible_cpu(cpu) { 545 dev = get_cpu_device(cpu); 546 ret = sysfs_create_group(&dev->kobj, attrs); 547 WARN_ON(ret != 0); 548 } 549 550 mutex_unlock(&cpu_mutex); 551 return 0; 552 } 553 EXPORT_SYMBOL_GPL(cpu_add_dev_attr_group); 554 555 556 void cpu_remove_dev_attr(struct device_attribute *attr) 557 { 558 int cpu; 559 560 mutex_lock(&cpu_mutex); 561 562 for_each_possible_cpu(cpu) { 563 device_remove_file(get_cpu_device(cpu), attr); 564 } 565 566 mutex_unlock(&cpu_mutex); 567 } 568 EXPORT_SYMBOL_GPL(cpu_remove_dev_attr); 569 570 void cpu_remove_dev_attr_group(struct attribute_group *attrs) 571 { 572 int cpu; 573 struct device *dev; 574 575 mutex_lock(&cpu_mutex); 576 577 for_each_possible_cpu(cpu) { 578 dev = get_cpu_device(cpu); 579 sysfs_remove_group(&dev->kobj, attrs); 580 } 581 582 mutex_unlock(&cpu_mutex); 583 } 584 EXPORT_SYMBOL_GPL(cpu_remove_dev_attr_group); 585 586 587 /* NUMA stuff */ 588 589 #ifdef CONFIG_NUMA 590 static void register_nodes(void) 591 { 592 int i; 593 594 for (i = 0; i < MAX_NUMNODES; i++) 595 register_one_node(i); 596 } 597 598 int sysfs_add_device_to_node(struct device *dev, int nid) 599 { 600 struct node *node = &node_devices[nid]; 601 return sysfs_create_link(&node->dev.kobj, &dev->kobj, 602 kobject_name(&dev->kobj)); 603 } 604 EXPORT_SYMBOL_GPL(sysfs_add_device_to_node); 605 606 void sysfs_remove_device_from_node(struct device *dev, int nid) 607 { 608 struct node *node = &node_devices[nid]; 609 sysfs_remove_link(&node->dev.kobj, kobject_name(&dev->kobj)); 610 } 611 EXPORT_SYMBOL_GPL(sysfs_remove_device_from_node); 612 613 #else 614 static void register_nodes(void) 615 { 616 return; 617 } 618 619 #endif 620 621 /* Only valid if CPU is present. */ 622 static ssize_t show_physical_id(struct device *dev, 623 struct device_attribute *attr, char *buf) 624 { 625 struct cpu *cpu = container_of(dev, struct cpu, dev); 626 627 return sprintf(buf, "%d\n", get_hard_smp_processor_id(cpu->dev.id)); 628 } 629 static DEVICE_ATTR(physical_id, 0444, show_physical_id, NULL); 630 631 static int __init topology_init(void) 632 { 633 int cpu; 634 635 register_nodes(); 636 register_cpu_notifier(&sysfs_cpu_nb); 637 638 for_each_possible_cpu(cpu) { 639 struct cpu *c = &per_cpu(cpu_devices, cpu); 640 641 /* 642 * For now, we just see if the system supports making 643 * the RTAS calls for CPU hotplug. But, there may be a 644 * more comprehensive way to do this for an individual 645 * CPU. For instance, the boot cpu might never be valid 646 * for hotplugging. 647 */ 648 if (ppc_md.cpu_die) 649 c->hotpluggable = 1; 650 651 if (cpu_online(cpu) || c->hotpluggable) { 652 register_cpu(c, cpu); 653 654 device_create_file(&c->dev, &dev_attr_physical_id); 655 } 656 657 if (cpu_online(cpu)) 658 register_cpu_online(cpu); 659 } 660 #ifdef CONFIG_PPC64 661 sysfs_create_dscr_default(); 662 #endif /* CONFIG_PPC64 */ 663 664 return 0; 665 } 666 subsys_initcall(topology_init); 667