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(cpu->dev.id, 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 void update_dscr(void *dummy) 198 { 199 if (!current->thread.dscr_inherit) { 200 current->thread.dscr = dscr_default; 201 mtspr(SPRN_DSCR, dscr_default); 202 } 203 } 204 205 static ssize_t __used store_dscr_default(struct device *dev, 206 struct device_attribute *attr, const char *buf, 207 size_t count) 208 { 209 unsigned long val; 210 int ret = 0; 211 212 ret = sscanf(buf, "%lx", &val); 213 if (ret != 1) 214 return -EINVAL; 215 dscr_default = val; 216 217 on_each_cpu(update_dscr, NULL, 1); 218 219 return count; 220 } 221 222 static DEVICE_ATTR(dscr_default, 0600, 223 show_dscr_default, store_dscr_default); 224 225 static void sysfs_create_dscr_default(void) 226 { 227 int err = 0; 228 if (cpu_has_feature(CPU_FTR_DSCR)) 229 err = device_create_file(cpu_subsys.dev_root, &dev_attr_dscr_default); 230 } 231 #endif /* CONFIG_PPC64 */ 232 233 #ifdef HAS_PPC_PMC_PA6T 234 SYSFS_PMCSETUP(pa6t_pmc0, SPRN_PA6T_PMC0); 235 SYSFS_PMCSETUP(pa6t_pmc1, SPRN_PA6T_PMC1); 236 SYSFS_PMCSETUP(pa6t_pmc2, SPRN_PA6T_PMC2); 237 SYSFS_PMCSETUP(pa6t_pmc3, SPRN_PA6T_PMC3); 238 SYSFS_PMCSETUP(pa6t_pmc4, SPRN_PA6T_PMC4); 239 SYSFS_PMCSETUP(pa6t_pmc5, SPRN_PA6T_PMC5); 240 #ifdef CONFIG_DEBUG_KERNEL 241 SYSFS_PMCSETUP(hid0, SPRN_HID0); 242 SYSFS_PMCSETUP(hid1, SPRN_HID1); 243 SYSFS_PMCSETUP(hid4, SPRN_HID4); 244 SYSFS_PMCSETUP(hid5, SPRN_HID5); 245 SYSFS_PMCSETUP(ima0, SPRN_PA6T_IMA0); 246 SYSFS_PMCSETUP(ima1, SPRN_PA6T_IMA1); 247 SYSFS_PMCSETUP(ima2, SPRN_PA6T_IMA2); 248 SYSFS_PMCSETUP(ima3, SPRN_PA6T_IMA3); 249 SYSFS_PMCSETUP(ima4, SPRN_PA6T_IMA4); 250 SYSFS_PMCSETUP(ima5, SPRN_PA6T_IMA5); 251 SYSFS_PMCSETUP(ima6, SPRN_PA6T_IMA6); 252 SYSFS_PMCSETUP(ima7, SPRN_PA6T_IMA7); 253 SYSFS_PMCSETUP(ima8, SPRN_PA6T_IMA8); 254 SYSFS_PMCSETUP(ima9, SPRN_PA6T_IMA9); 255 SYSFS_PMCSETUP(imaat, SPRN_PA6T_IMAAT); 256 SYSFS_PMCSETUP(btcr, SPRN_PA6T_BTCR); 257 SYSFS_PMCSETUP(pccr, SPRN_PA6T_PCCR); 258 SYSFS_PMCSETUP(rpccr, SPRN_PA6T_RPCCR); 259 SYSFS_PMCSETUP(der, SPRN_PA6T_DER); 260 SYSFS_PMCSETUP(mer, SPRN_PA6T_MER); 261 SYSFS_PMCSETUP(ber, SPRN_PA6T_BER); 262 SYSFS_PMCSETUP(ier, SPRN_PA6T_IER); 263 SYSFS_PMCSETUP(sier, SPRN_PA6T_SIER); 264 SYSFS_PMCSETUP(siar, SPRN_PA6T_SIAR); 265 SYSFS_PMCSETUP(tsr0, SPRN_PA6T_TSR0); 266 SYSFS_PMCSETUP(tsr1, SPRN_PA6T_TSR1); 267 SYSFS_PMCSETUP(tsr2, SPRN_PA6T_TSR2); 268 SYSFS_PMCSETUP(tsr3, SPRN_PA6T_TSR3); 269 #endif /* CONFIG_DEBUG_KERNEL */ 270 #endif /* HAS_PPC_PMC_PA6T */ 271 272 #ifdef HAS_PPC_PMC_IBM 273 static struct device_attribute ibm_common_attrs[] = { 274 __ATTR(mmcr0, 0600, show_mmcr0, store_mmcr0), 275 __ATTR(mmcr1, 0600, show_mmcr1, store_mmcr1), 276 }; 277 #endif /* HAS_PPC_PMC_G4 */ 278 279 #ifdef HAS_PPC_PMC_G4 280 static struct device_attribute g4_common_attrs[] = { 281 __ATTR(mmcr0, 0600, show_mmcr0, store_mmcr0), 282 __ATTR(mmcr1, 0600, show_mmcr1, store_mmcr1), 283 __ATTR(mmcr2, 0600, show_mmcr2, store_mmcr2), 284 }; 285 #endif /* HAS_PPC_PMC_G4 */ 286 287 static struct device_attribute classic_pmc_attrs[] = { 288 __ATTR(pmc1, 0600, show_pmc1, store_pmc1), 289 __ATTR(pmc2, 0600, show_pmc2, store_pmc2), 290 __ATTR(pmc3, 0600, show_pmc3, store_pmc3), 291 __ATTR(pmc4, 0600, show_pmc4, store_pmc4), 292 __ATTR(pmc5, 0600, show_pmc5, store_pmc5), 293 __ATTR(pmc6, 0600, show_pmc6, store_pmc6), 294 #ifdef CONFIG_PPC64 295 __ATTR(pmc7, 0600, show_pmc7, store_pmc7), 296 __ATTR(pmc8, 0600, show_pmc8, store_pmc8), 297 #endif 298 }; 299 300 #ifdef HAS_PPC_PMC_PA6T 301 static struct device_attribute pa6t_attrs[] = { 302 __ATTR(mmcr0, 0600, show_mmcr0, store_mmcr0), 303 __ATTR(mmcr1, 0600, show_mmcr1, store_mmcr1), 304 __ATTR(pmc0, 0600, show_pa6t_pmc0, store_pa6t_pmc0), 305 __ATTR(pmc1, 0600, show_pa6t_pmc1, store_pa6t_pmc1), 306 __ATTR(pmc2, 0600, show_pa6t_pmc2, store_pa6t_pmc2), 307 __ATTR(pmc3, 0600, show_pa6t_pmc3, store_pa6t_pmc3), 308 __ATTR(pmc4, 0600, show_pa6t_pmc4, store_pa6t_pmc4), 309 __ATTR(pmc5, 0600, show_pa6t_pmc5, store_pa6t_pmc5), 310 #ifdef CONFIG_DEBUG_KERNEL 311 __ATTR(hid0, 0600, show_hid0, store_hid0), 312 __ATTR(hid1, 0600, show_hid1, store_hid1), 313 __ATTR(hid4, 0600, show_hid4, store_hid4), 314 __ATTR(hid5, 0600, show_hid5, store_hid5), 315 __ATTR(ima0, 0600, show_ima0, store_ima0), 316 __ATTR(ima1, 0600, show_ima1, store_ima1), 317 __ATTR(ima2, 0600, show_ima2, store_ima2), 318 __ATTR(ima3, 0600, show_ima3, store_ima3), 319 __ATTR(ima4, 0600, show_ima4, store_ima4), 320 __ATTR(ima5, 0600, show_ima5, store_ima5), 321 __ATTR(ima6, 0600, show_ima6, store_ima6), 322 __ATTR(ima7, 0600, show_ima7, store_ima7), 323 __ATTR(ima8, 0600, show_ima8, store_ima8), 324 __ATTR(ima9, 0600, show_ima9, store_ima9), 325 __ATTR(imaat, 0600, show_imaat, store_imaat), 326 __ATTR(btcr, 0600, show_btcr, store_btcr), 327 __ATTR(pccr, 0600, show_pccr, store_pccr), 328 __ATTR(rpccr, 0600, show_rpccr, store_rpccr), 329 __ATTR(der, 0600, show_der, store_der), 330 __ATTR(mer, 0600, show_mer, store_mer), 331 __ATTR(ber, 0600, show_ber, store_ber), 332 __ATTR(ier, 0600, show_ier, store_ier), 333 __ATTR(sier, 0600, show_sier, store_sier), 334 __ATTR(siar, 0600, show_siar, store_siar), 335 __ATTR(tsr0, 0600, show_tsr0, store_tsr0), 336 __ATTR(tsr1, 0600, show_tsr1, store_tsr1), 337 __ATTR(tsr2, 0600, show_tsr2, store_tsr2), 338 __ATTR(tsr3, 0600, show_tsr3, store_tsr3), 339 #endif /* CONFIG_DEBUG_KERNEL */ 340 }; 341 #endif /* HAS_PPC_PMC_PA6T */ 342 #endif /* HAS_PPC_PMC_CLASSIC */ 343 344 static void __cpuinit register_cpu_online(unsigned int cpu) 345 { 346 struct cpu *c = &per_cpu(cpu_devices, cpu); 347 struct device *s = &c->dev; 348 struct device_attribute *attrs, *pmc_attrs; 349 int i, nattrs; 350 351 #ifdef CONFIG_PPC64 352 if (cpu_has_feature(CPU_FTR_SMT)) 353 device_create_file(s, &dev_attr_smt_snooze_delay); 354 #endif 355 356 /* PMC stuff */ 357 switch (cur_cpu_spec->pmc_type) { 358 #ifdef HAS_PPC_PMC_IBM 359 case PPC_PMC_IBM: 360 attrs = ibm_common_attrs; 361 nattrs = sizeof(ibm_common_attrs) / sizeof(struct device_attribute); 362 pmc_attrs = classic_pmc_attrs; 363 break; 364 #endif /* HAS_PPC_PMC_IBM */ 365 #ifdef HAS_PPC_PMC_G4 366 case PPC_PMC_G4: 367 attrs = g4_common_attrs; 368 nattrs = sizeof(g4_common_attrs) / sizeof(struct device_attribute); 369 pmc_attrs = classic_pmc_attrs; 370 break; 371 #endif /* HAS_PPC_PMC_G4 */ 372 #ifdef HAS_PPC_PMC_PA6T 373 case PPC_PMC_PA6T: 374 /* PA Semi starts counting at PMC0 */ 375 attrs = pa6t_attrs; 376 nattrs = sizeof(pa6t_attrs) / sizeof(struct device_attribute); 377 pmc_attrs = NULL; 378 break; 379 #endif /* HAS_PPC_PMC_PA6T */ 380 default: 381 attrs = NULL; 382 nattrs = 0; 383 pmc_attrs = NULL; 384 } 385 386 for (i = 0; i < nattrs; i++) 387 device_create_file(s, &attrs[i]); 388 389 if (pmc_attrs) 390 for (i = 0; i < cur_cpu_spec->num_pmcs; i++) 391 device_create_file(s, &pmc_attrs[i]); 392 393 #ifdef CONFIG_PPC64 394 if (cpu_has_feature(CPU_FTR_MMCRA)) 395 device_create_file(s, &dev_attr_mmcra); 396 397 if (cpu_has_feature(CPU_FTR_PURR)) 398 device_create_file(s, &dev_attr_purr); 399 400 if (cpu_has_feature(CPU_FTR_SPURR)) 401 device_create_file(s, &dev_attr_spurr); 402 403 if (cpu_has_feature(CPU_FTR_DSCR)) 404 device_create_file(s, &dev_attr_dscr); 405 406 if (cpu_has_feature(CPU_FTR_PPCAS_ARCH_V2)) 407 device_create_file(s, &dev_attr_pir); 408 #endif /* CONFIG_PPC64 */ 409 410 cacheinfo_cpu_online(cpu); 411 } 412 413 #ifdef CONFIG_HOTPLUG_CPU 414 static void unregister_cpu_online(unsigned int cpu) 415 { 416 struct cpu *c = &per_cpu(cpu_devices, cpu); 417 struct device *s = &c->dev; 418 struct device_attribute *attrs, *pmc_attrs; 419 int i, nattrs; 420 421 BUG_ON(!c->hotpluggable); 422 423 #ifdef CONFIG_PPC64 424 if (cpu_has_feature(CPU_FTR_SMT)) 425 device_remove_file(s, &dev_attr_smt_snooze_delay); 426 #endif 427 428 /* PMC stuff */ 429 switch (cur_cpu_spec->pmc_type) { 430 #ifdef HAS_PPC_PMC_IBM 431 case PPC_PMC_IBM: 432 attrs = ibm_common_attrs; 433 nattrs = sizeof(ibm_common_attrs) / sizeof(struct device_attribute); 434 pmc_attrs = classic_pmc_attrs; 435 break; 436 #endif /* HAS_PPC_PMC_IBM */ 437 #ifdef HAS_PPC_PMC_G4 438 case PPC_PMC_G4: 439 attrs = g4_common_attrs; 440 nattrs = sizeof(g4_common_attrs) / sizeof(struct device_attribute); 441 pmc_attrs = classic_pmc_attrs; 442 break; 443 #endif /* HAS_PPC_PMC_G4 */ 444 #ifdef HAS_PPC_PMC_PA6T 445 case PPC_PMC_PA6T: 446 /* PA Semi starts counting at PMC0 */ 447 attrs = pa6t_attrs; 448 nattrs = sizeof(pa6t_attrs) / sizeof(struct device_attribute); 449 pmc_attrs = NULL; 450 break; 451 #endif /* HAS_PPC_PMC_PA6T */ 452 default: 453 attrs = NULL; 454 nattrs = 0; 455 pmc_attrs = NULL; 456 } 457 458 for (i = 0; i < nattrs; i++) 459 device_remove_file(s, &attrs[i]); 460 461 if (pmc_attrs) 462 for (i = 0; i < cur_cpu_spec->num_pmcs; i++) 463 device_remove_file(s, &pmc_attrs[i]); 464 465 #ifdef CONFIG_PPC64 466 if (cpu_has_feature(CPU_FTR_MMCRA)) 467 device_remove_file(s, &dev_attr_mmcra); 468 469 if (cpu_has_feature(CPU_FTR_PURR)) 470 device_remove_file(s, &dev_attr_purr); 471 472 if (cpu_has_feature(CPU_FTR_SPURR)) 473 device_remove_file(s, &dev_attr_spurr); 474 475 if (cpu_has_feature(CPU_FTR_DSCR)) 476 device_remove_file(s, &dev_attr_dscr); 477 478 if (cpu_has_feature(CPU_FTR_PPCAS_ARCH_V2)) 479 device_remove_file(s, &dev_attr_pir); 480 #endif /* CONFIG_PPC64 */ 481 482 cacheinfo_cpu_offline(cpu); 483 } 484 485 #ifdef CONFIG_ARCH_CPU_PROBE_RELEASE 486 ssize_t arch_cpu_probe(const char *buf, size_t count) 487 { 488 if (ppc_md.cpu_probe) 489 return ppc_md.cpu_probe(buf, count); 490 491 return -EINVAL; 492 } 493 494 ssize_t arch_cpu_release(const char *buf, size_t count) 495 { 496 if (ppc_md.cpu_release) 497 return ppc_md.cpu_release(buf, count); 498 499 return -EINVAL; 500 } 501 #endif /* CONFIG_ARCH_CPU_PROBE_RELEASE */ 502 503 #endif /* CONFIG_HOTPLUG_CPU */ 504 505 static int __cpuinit sysfs_cpu_notify(struct notifier_block *self, 506 unsigned long action, void *hcpu) 507 { 508 unsigned int cpu = (unsigned int)(long)hcpu; 509 510 switch (action) { 511 case CPU_ONLINE: 512 case CPU_ONLINE_FROZEN: 513 register_cpu_online(cpu); 514 break; 515 #ifdef CONFIG_HOTPLUG_CPU 516 case CPU_DEAD: 517 case CPU_DEAD_FROZEN: 518 unregister_cpu_online(cpu); 519 break; 520 #endif 521 } 522 return NOTIFY_OK; 523 } 524 525 static struct notifier_block __cpuinitdata sysfs_cpu_nb = { 526 .notifier_call = sysfs_cpu_notify, 527 }; 528 529 static DEFINE_MUTEX(cpu_mutex); 530 531 int cpu_add_dev_attr(struct device_attribute *attr) 532 { 533 int cpu; 534 535 mutex_lock(&cpu_mutex); 536 537 for_each_possible_cpu(cpu) { 538 device_create_file(get_cpu_device(cpu), attr); 539 } 540 541 mutex_unlock(&cpu_mutex); 542 return 0; 543 } 544 EXPORT_SYMBOL_GPL(cpu_add_dev_attr); 545 546 int cpu_add_dev_attr_group(struct attribute_group *attrs) 547 { 548 int cpu; 549 struct device *dev; 550 int ret; 551 552 mutex_lock(&cpu_mutex); 553 554 for_each_possible_cpu(cpu) { 555 dev = get_cpu_device(cpu); 556 ret = sysfs_create_group(&dev->kobj, attrs); 557 WARN_ON(ret != 0); 558 } 559 560 mutex_unlock(&cpu_mutex); 561 return 0; 562 } 563 EXPORT_SYMBOL_GPL(cpu_add_dev_attr_group); 564 565 566 void cpu_remove_dev_attr(struct device_attribute *attr) 567 { 568 int cpu; 569 570 mutex_lock(&cpu_mutex); 571 572 for_each_possible_cpu(cpu) { 573 device_remove_file(get_cpu_device(cpu), attr); 574 } 575 576 mutex_unlock(&cpu_mutex); 577 } 578 EXPORT_SYMBOL_GPL(cpu_remove_dev_attr); 579 580 void cpu_remove_dev_attr_group(struct attribute_group *attrs) 581 { 582 int cpu; 583 struct device *dev; 584 585 mutex_lock(&cpu_mutex); 586 587 for_each_possible_cpu(cpu) { 588 dev = get_cpu_device(cpu); 589 sysfs_remove_group(&dev->kobj, attrs); 590 } 591 592 mutex_unlock(&cpu_mutex); 593 } 594 EXPORT_SYMBOL_GPL(cpu_remove_dev_attr_group); 595 596 597 /* NUMA stuff */ 598 599 #ifdef CONFIG_NUMA 600 static void register_nodes(void) 601 { 602 int i; 603 604 for (i = 0; i < MAX_NUMNODES; i++) 605 register_one_node(i); 606 } 607 608 int sysfs_add_device_to_node(struct device *dev, int nid) 609 { 610 struct node *node = node_devices[nid]; 611 return sysfs_create_link(&node->dev.kobj, &dev->kobj, 612 kobject_name(&dev->kobj)); 613 } 614 EXPORT_SYMBOL_GPL(sysfs_add_device_to_node); 615 616 void sysfs_remove_device_from_node(struct device *dev, int nid) 617 { 618 struct node *node = node_devices[nid]; 619 sysfs_remove_link(&node->dev.kobj, kobject_name(&dev->kobj)); 620 } 621 EXPORT_SYMBOL_GPL(sysfs_remove_device_from_node); 622 623 #else 624 static void register_nodes(void) 625 { 626 return; 627 } 628 629 #endif 630 631 /* Only valid if CPU is present. */ 632 static ssize_t show_physical_id(struct device *dev, 633 struct device_attribute *attr, char *buf) 634 { 635 struct cpu *cpu = container_of(dev, struct cpu, dev); 636 637 return sprintf(buf, "%d\n", get_hard_smp_processor_id(cpu->dev.id)); 638 } 639 static DEVICE_ATTR(physical_id, 0444, show_physical_id, NULL); 640 641 static int __init topology_init(void) 642 { 643 int cpu; 644 645 register_nodes(); 646 register_cpu_notifier(&sysfs_cpu_nb); 647 648 for_each_possible_cpu(cpu) { 649 struct cpu *c = &per_cpu(cpu_devices, cpu); 650 651 /* 652 * For now, we just see if the system supports making 653 * the RTAS calls for CPU hotplug. But, there may be a 654 * more comprehensive way to do this for an individual 655 * CPU. For instance, the boot cpu might never be valid 656 * for hotplugging. 657 */ 658 if (ppc_md.cpu_die) 659 c->hotpluggable = 1; 660 661 if (cpu_online(cpu) || c->hotpluggable) { 662 register_cpu(c, cpu); 663 664 device_create_file(&c->dev, &dev_attr_physical_id); 665 } 666 667 if (cpu_online(cpu)) 668 register_cpu_online(cpu); 669 } 670 #ifdef CONFIG_PPC64 671 sysfs_create_dscr_default(); 672 #endif /* CONFIG_PPC64 */ 673 674 return 0; 675 } 676 subsys_initcall(topology_init); 677