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 #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(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 #define SYSFS_PMCSETUP(NAME, ADDRESS) \ 138 static void read_##NAME(void *val) \ 139 { \ 140 *(unsigned long *)val = mfspr(ADDRESS); \ 141 } \ 142 static void write_##NAME(void *val) \ 143 { \ 144 ppc_enable_pmcs(); \ 145 mtspr(ADDRESS, *(unsigned long *)val); \ 146 } \ 147 static ssize_t show_##NAME(struct sys_device *dev, \ 148 struct sysdev_attribute *attr, \ 149 char *buf) \ 150 { \ 151 struct cpu *cpu = container_of(dev, struct cpu, sysdev); \ 152 unsigned long val; \ 153 smp_call_function_single(cpu->sysdev.id, read_##NAME, &val, 1); \ 154 return sprintf(buf, "%lx\n", val); \ 155 } \ 156 static ssize_t __used \ 157 store_##NAME(struct sys_device *dev, struct sysdev_attribute *attr, \ 158 const char *buf, size_t count) \ 159 { \ 160 struct cpu *cpu = container_of(dev, struct cpu, sysdev); \ 161 unsigned long val; \ 162 int ret = sscanf(buf, "%lx", &val); \ 163 if (ret != 1) \ 164 return -EINVAL; \ 165 smp_call_function_single(cpu->sysdev.id, write_##NAME, &val, 1); \ 166 return count; \ 167 } 168 169 170 /* Let's define all possible registers, we'll only hook up the ones 171 * that are implemented on the current processor 172 */ 173 174 #if defined(CONFIG_PPC64) 175 #define HAS_PPC_PMC_CLASSIC 1 176 #define HAS_PPC_PMC_IBM 1 177 #define HAS_PPC_PMC_PA6T 1 178 #elif defined(CONFIG_6xx) 179 #define HAS_PPC_PMC_CLASSIC 1 180 #define HAS_PPC_PMC_IBM 1 181 #define HAS_PPC_PMC_G4 1 182 #endif 183 184 185 #ifdef HAS_PPC_PMC_CLASSIC 186 SYSFS_PMCSETUP(mmcr0, SPRN_MMCR0); 187 SYSFS_PMCSETUP(mmcr1, SPRN_MMCR1); 188 SYSFS_PMCSETUP(pmc1, SPRN_PMC1); 189 SYSFS_PMCSETUP(pmc2, SPRN_PMC2); 190 SYSFS_PMCSETUP(pmc3, SPRN_PMC3); 191 SYSFS_PMCSETUP(pmc4, SPRN_PMC4); 192 SYSFS_PMCSETUP(pmc5, SPRN_PMC5); 193 SYSFS_PMCSETUP(pmc6, SPRN_PMC6); 194 195 #ifdef HAS_PPC_PMC_G4 196 SYSFS_PMCSETUP(mmcr2, SPRN_MMCR2); 197 #endif 198 199 #ifdef CONFIG_PPC64 200 SYSFS_PMCSETUP(pmc7, SPRN_PMC7); 201 SYSFS_PMCSETUP(pmc8, SPRN_PMC8); 202 203 SYSFS_PMCSETUP(mmcra, SPRN_MMCRA); 204 SYSFS_PMCSETUP(purr, SPRN_PURR); 205 SYSFS_PMCSETUP(spurr, SPRN_SPURR); 206 SYSFS_PMCSETUP(dscr, SPRN_DSCR); 207 208 static SYSDEV_ATTR(mmcra, 0600, show_mmcra, store_mmcra); 209 static SYSDEV_ATTR(spurr, 0600, show_spurr, NULL); 210 static SYSDEV_ATTR(dscr, 0600, show_dscr, store_dscr); 211 static SYSDEV_ATTR(purr, 0600, show_purr, store_purr); 212 #endif /* CONFIG_PPC64 */ 213 214 #ifdef HAS_PPC_PMC_PA6T 215 SYSFS_PMCSETUP(pa6t_pmc0, SPRN_PA6T_PMC0); 216 SYSFS_PMCSETUP(pa6t_pmc1, SPRN_PA6T_PMC1); 217 SYSFS_PMCSETUP(pa6t_pmc2, SPRN_PA6T_PMC2); 218 SYSFS_PMCSETUP(pa6t_pmc3, SPRN_PA6T_PMC3); 219 SYSFS_PMCSETUP(pa6t_pmc4, SPRN_PA6T_PMC4); 220 SYSFS_PMCSETUP(pa6t_pmc5, SPRN_PA6T_PMC5); 221 #ifdef CONFIG_DEBUG_KERNEL 222 SYSFS_PMCSETUP(hid0, SPRN_HID0); 223 SYSFS_PMCSETUP(hid1, SPRN_HID1); 224 SYSFS_PMCSETUP(hid4, SPRN_HID4); 225 SYSFS_PMCSETUP(hid5, SPRN_HID5); 226 SYSFS_PMCSETUP(ima0, SPRN_PA6T_IMA0); 227 SYSFS_PMCSETUP(ima1, SPRN_PA6T_IMA1); 228 SYSFS_PMCSETUP(ima2, SPRN_PA6T_IMA2); 229 SYSFS_PMCSETUP(ima3, SPRN_PA6T_IMA3); 230 SYSFS_PMCSETUP(ima4, SPRN_PA6T_IMA4); 231 SYSFS_PMCSETUP(ima5, SPRN_PA6T_IMA5); 232 SYSFS_PMCSETUP(ima6, SPRN_PA6T_IMA6); 233 SYSFS_PMCSETUP(ima7, SPRN_PA6T_IMA7); 234 SYSFS_PMCSETUP(ima8, SPRN_PA6T_IMA8); 235 SYSFS_PMCSETUP(ima9, SPRN_PA6T_IMA9); 236 SYSFS_PMCSETUP(imaat, SPRN_PA6T_IMAAT); 237 SYSFS_PMCSETUP(btcr, SPRN_PA6T_BTCR); 238 SYSFS_PMCSETUP(pccr, SPRN_PA6T_PCCR); 239 SYSFS_PMCSETUP(rpccr, SPRN_PA6T_RPCCR); 240 SYSFS_PMCSETUP(der, SPRN_PA6T_DER); 241 SYSFS_PMCSETUP(mer, SPRN_PA6T_MER); 242 SYSFS_PMCSETUP(ber, SPRN_PA6T_BER); 243 SYSFS_PMCSETUP(ier, SPRN_PA6T_IER); 244 SYSFS_PMCSETUP(sier, SPRN_PA6T_SIER); 245 SYSFS_PMCSETUP(siar, SPRN_PA6T_SIAR); 246 SYSFS_PMCSETUP(tsr0, SPRN_PA6T_TSR0); 247 SYSFS_PMCSETUP(tsr1, SPRN_PA6T_TSR1); 248 SYSFS_PMCSETUP(tsr2, SPRN_PA6T_TSR2); 249 SYSFS_PMCSETUP(tsr3, SPRN_PA6T_TSR3); 250 #endif /* CONFIG_DEBUG_KERNEL */ 251 #endif /* HAS_PPC_PMC_PA6T */ 252 253 #ifdef HAS_PPC_PMC_IBM 254 static struct sysdev_attribute ibm_common_attrs[] = { 255 _SYSDEV_ATTR(mmcr0, 0600, show_mmcr0, store_mmcr0), 256 _SYSDEV_ATTR(mmcr1, 0600, show_mmcr1, store_mmcr1), 257 }; 258 #endif /* HAS_PPC_PMC_G4 */ 259 260 #ifdef HAS_PPC_PMC_G4 261 static struct sysdev_attribute g4_common_attrs[] = { 262 _SYSDEV_ATTR(mmcr0, 0600, show_mmcr0, store_mmcr0), 263 _SYSDEV_ATTR(mmcr1, 0600, show_mmcr1, store_mmcr1), 264 _SYSDEV_ATTR(mmcr2, 0600, show_mmcr2, store_mmcr2), 265 }; 266 #endif /* HAS_PPC_PMC_G4 */ 267 268 static struct sysdev_attribute classic_pmc_attrs[] = { 269 _SYSDEV_ATTR(pmc1, 0600, show_pmc1, store_pmc1), 270 _SYSDEV_ATTR(pmc2, 0600, show_pmc2, store_pmc2), 271 _SYSDEV_ATTR(pmc3, 0600, show_pmc3, store_pmc3), 272 _SYSDEV_ATTR(pmc4, 0600, show_pmc4, store_pmc4), 273 _SYSDEV_ATTR(pmc5, 0600, show_pmc5, store_pmc5), 274 _SYSDEV_ATTR(pmc6, 0600, show_pmc6, store_pmc6), 275 #ifdef CONFIG_PPC64 276 _SYSDEV_ATTR(pmc7, 0600, show_pmc7, store_pmc7), 277 _SYSDEV_ATTR(pmc8, 0600, show_pmc8, store_pmc8), 278 #endif 279 }; 280 281 #ifdef HAS_PPC_PMC_PA6T 282 static struct sysdev_attribute pa6t_attrs[] = { 283 _SYSDEV_ATTR(mmcr0, 0600, show_mmcr0, store_mmcr0), 284 _SYSDEV_ATTR(mmcr1, 0600, show_mmcr1, store_mmcr1), 285 _SYSDEV_ATTR(pmc0, 0600, show_pa6t_pmc0, store_pa6t_pmc0), 286 _SYSDEV_ATTR(pmc1, 0600, show_pa6t_pmc1, store_pa6t_pmc1), 287 _SYSDEV_ATTR(pmc2, 0600, show_pa6t_pmc2, store_pa6t_pmc2), 288 _SYSDEV_ATTR(pmc3, 0600, show_pa6t_pmc3, store_pa6t_pmc3), 289 _SYSDEV_ATTR(pmc4, 0600, show_pa6t_pmc4, store_pa6t_pmc4), 290 _SYSDEV_ATTR(pmc5, 0600, show_pa6t_pmc5, store_pa6t_pmc5), 291 #ifdef CONFIG_DEBUG_KERNEL 292 _SYSDEV_ATTR(hid0, 0600, show_hid0, store_hid0), 293 _SYSDEV_ATTR(hid1, 0600, show_hid1, store_hid1), 294 _SYSDEV_ATTR(hid4, 0600, show_hid4, store_hid4), 295 _SYSDEV_ATTR(hid5, 0600, show_hid5, store_hid5), 296 _SYSDEV_ATTR(ima0, 0600, show_ima0, store_ima0), 297 _SYSDEV_ATTR(ima1, 0600, show_ima1, store_ima1), 298 _SYSDEV_ATTR(ima2, 0600, show_ima2, store_ima2), 299 _SYSDEV_ATTR(ima3, 0600, show_ima3, store_ima3), 300 _SYSDEV_ATTR(ima4, 0600, show_ima4, store_ima4), 301 _SYSDEV_ATTR(ima5, 0600, show_ima5, store_ima5), 302 _SYSDEV_ATTR(ima6, 0600, show_ima6, store_ima6), 303 _SYSDEV_ATTR(ima7, 0600, show_ima7, store_ima7), 304 _SYSDEV_ATTR(ima8, 0600, show_ima8, store_ima8), 305 _SYSDEV_ATTR(ima9, 0600, show_ima9, store_ima9), 306 _SYSDEV_ATTR(imaat, 0600, show_imaat, store_imaat), 307 _SYSDEV_ATTR(btcr, 0600, show_btcr, store_btcr), 308 _SYSDEV_ATTR(pccr, 0600, show_pccr, store_pccr), 309 _SYSDEV_ATTR(rpccr, 0600, show_rpccr, store_rpccr), 310 _SYSDEV_ATTR(der, 0600, show_der, store_der), 311 _SYSDEV_ATTR(mer, 0600, show_mer, store_mer), 312 _SYSDEV_ATTR(ber, 0600, show_ber, store_ber), 313 _SYSDEV_ATTR(ier, 0600, show_ier, store_ier), 314 _SYSDEV_ATTR(sier, 0600, show_sier, store_sier), 315 _SYSDEV_ATTR(siar, 0600, show_siar, store_siar), 316 _SYSDEV_ATTR(tsr0, 0600, show_tsr0, store_tsr0), 317 _SYSDEV_ATTR(tsr1, 0600, show_tsr1, store_tsr1), 318 _SYSDEV_ATTR(tsr2, 0600, show_tsr2, store_tsr2), 319 _SYSDEV_ATTR(tsr3, 0600, show_tsr3, store_tsr3), 320 #endif /* CONFIG_DEBUG_KERNEL */ 321 }; 322 #endif /* HAS_PPC_PMC_PA6T */ 323 #endif /* HAS_PPC_PMC_CLASSIC */ 324 325 static void __cpuinit register_cpu_online(unsigned int cpu) 326 { 327 struct cpu *c = &per_cpu(cpu_devices, cpu); 328 struct sys_device *s = &c->sysdev; 329 struct sysdev_attribute *attrs, *pmc_attrs; 330 int i, nattrs; 331 332 #ifdef CONFIG_PPC64 333 if (!firmware_has_feature(FW_FEATURE_ISERIES) && 334 cpu_has_feature(CPU_FTR_SMT)) 335 sysdev_create_file(s, &attr_smt_snooze_delay); 336 #endif 337 338 /* PMC stuff */ 339 switch (cur_cpu_spec->pmc_type) { 340 #ifdef HAS_PPC_PMC_IBM 341 case PPC_PMC_IBM: 342 attrs = ibm_common_attrs; 343 nattrs = sizeof(ibm_common_attrs) / sizeof(struct sysdev_attribute); 344 pmc_attrs = classic_pmc_attrs; 345 break; 346 #endif /* HAS_PPC_PMC_IBM */ 347 #ifdef HAS_PPC_PMC_G4 348 case PPC_PMC_G4: 349 attrs = g4_common_attrs; 350 nattrs = sizeof(g4_common_attrs) / sizeof(struct sysdev_attribute); 351 pmc_attrs = classic_pmc_attrs; 352 break; 353 #endif /* HAS_PPC_PMC_G4 */ 354 #ifdef HAS_PPC_PMC_PA6T 355 case PPC_PMC_PA6T: 356 /* PA Semi starts counting at PMC0 */ 357 attrs = pa6t_attrs; 358 nattrs = sizeof(pa6t_attrs) / sizeof(struct sysdev_attribute); 359 pmc_attrs = NULL; 360 break; 361 #endif /* HAS_PPC_PMC_PA6T */ 362 default: 363 attrs = NULL; 364 nattrs = 0; 365 pmc_attrs = NULL; 366 } 367 368 for (i = 0; i < nattrs; i++) 369 sysdev_create_file(s, &attrs[i]); 370 371 if (pmc_attrs) 372 for (i = 0; i < cur_cpu_spec->num_pmcs; i++) 373 sysdev_create_file(s, &pmc_attrs[i]); 374 375 #ifdef CONFIG_PPC64 376 if (cpu_has_feature(CPU_FTR_MMCRA)) 377 sysdev_create_file(s, &attr_mmcra); 378 379 if (cpu_has_feature(CPU_FTR_PURR)) 380 sysdev_create_file(s, &attr_purr); 381 382 if (cpu_has_feature(CPU_FTR_SPURR)) 383 sysdev_create_file(s, &attr_spurr); 384 385 if (cpu_has_feature(CPU_FTR_DSCR)) 386 sysdev_create_file(s, &attr_dscr); 387 #endif /* CONFIG_PPC64 */ 388 389 cacheinfo_cpu_online(cpu); 390 } 391 392 #ifdef CONFIG_HOTPLUG_CPU 393 static void unregister_cpu_online(unsigned int cpu) 394 { 395 struct cpu *c = &per_cpu(cpu_devices, cpu); 396 struct sys_device *s = &c->sysdev; 397 struct sysdev_attribute *attrs, *pmc_attrs; 398 int i, nattrs; 399 400 BUG_ON(!c->hotpluggable); 401 402 #ifdef CONFIG_PPC64 403 if (!firmware_has_feature(FW_FEATURE_ISERIES) && 404 cpu_has_feature(CPU_FTR_SMT)) 405 sysdev_remove_file(s, &attr_smt_snooze_delay); 406 #endif 407 408 /* PMC stuff */ 409 switch (cur_cpu_spec->pmc_type) { 410 #ifdef HAS_PPC_PMC_IBM 411 case PPC_PMC_IBM: 412 attrs = ibm_common_attrs; 413 nattrs = sizeof(ibm_common_attrs) / sizeof(struct sysdev_attribute); 414 pmc_attrs = classic_pmc_attrs; 415 break; 416 #endif /* HAS_PPC_PMC_IBM */ 417 #ifdef HAS_PPC_PMC_G4 418 case PPC_PMC_G4: 419 attrs = g4_common_attrs; 420 nattrs = sizeof(g4_common_attrs) / sizeof(struct sysdev_attribute); 421 pmc_attrs = classic_pmc_attrs; 422 break; 423 #endif /* HAS_PPC_PMC_G4 */ 424 #ifdef HAS_PPC_PMC_PA6T 425 case PPC_PMC_PA6T: 426 /* PA Semi starts counting at PMC0 */ 427 attrs = pa6t_attrs; 428 nattrs = sizeof(pa6t_attrs) / sizeof(struct sysdev_attribute); 429 pmc_attrs = NULL; 430 break; 431 #endif /* HAS_PPC_PMC_PA6T */ 432 default: 433 attrs = NULL; 434 nattrs = 0; 435 pmc_attrs = NULL; 436 } 437 438 for (i = 0; i < nattrs; i++) 439 sysdev_remove_file(s, &attrs[i]); 440 441 if (pmc_attrs) 442 for (i = 0; i < cur_cpu_spec->num_pmcs; i++) 443 sysdev_remove_file(s, &pmc_attrs[i]); 444 445 #ifdef CONFIG_PPC64 446 if (cpu_has_feature(CPU_FTR_MMCRA)) 447 sysdev_remove_file(s, &attr_mmcra); 448 449 if (cpu_has_feature(CPU_FTR_PURR)) 450 sysdev_remove_file(s, &attr_purr); 451 452 if (cpu_has_feature(CPU_FTR_SPURR)) 453 sysdev_remove_file(s, &attr_spurr); 454 455 if (cpu_has_feature(CPU_FTR_DSCR)) 456 sysdev_remove_file(s, &attr_dscr); 457 #endif /* CONFIG_PPC64 */ 458 459 cacheinfo_cpu_offline(cpu); 460 } 461 #endif /* CONFIG_HOTPLUG_CPU */ 462 463 static int __cpuinit sysfs_cpu_notify(struct notifier_block *self, 464 unsigned long action, void *hcpu) 465 { 466 unsigned int cpu = (unsigned int)(long)hcpu; 467 468 switch (action) { 469 case CPU_ONLINE: 470 case CPU_ONLINE_FROZEN: 471 register_cpu_online(cpu); 472 break; 473 #ifdef CONFIG_HOTPLUG_CPU 474 case CPU_DEAD: 475 case CPU_DEAD_FROZEN: 476 unregister_cpu_online(cpu); 477 break; 478 #endif 479 } 480 return NOTIFY_OK; 481 } 482 483 static struct notifier_block __cpuinitdata sysfs_cpu_nb = { 484 .notifier_call = sysfs_cpu_notify, 485 }; 486 487 static DEFINE_MUTEX(cpu_mutex); 488 489 int cpu_add_sysdev_attr(struct sysdev_attribute *attr) 490 { 491 int cpu; 492 493 mutex_lock(&cpu_mutex); 494 495 for_each_possible_cpu(cpu) { 496 sysdev_create_file(get_cpu_sysdev(cpu), attr); 497 } 498 499 mutex_unlock(&cpu_mutex); 500 return 0; 501 } 502 EXPORT_SYMBOL_GPL(cpu_add_sysdev_attr); 503 504 int cpu_add_sysdev_attr_group(struct attribute_group *attrs) 505 { 506 int cpu; 507 struct sys_device *sysdev; 508 int ret; 509 510 mutex_lock(&cpu_mutex); 511 512 for_each_possible_cpu(cpu) { 513 sysdev = get_cpu_sysdev(cpu); 514 ret = sysfs_create_group(&sysdev->kobj, attrs); 515 WARN_ON(ret != 0); 516 } 517 518 mutex_unlock(&cpu_mutex); 519 return 0; 520 } 521 EXPORT_SYMBOL_GPL(cpu_add_sysdev_attr_group); 522 523 524 void cpu_remove_sysdev_attr(struct sysdev_attribute *attr) 525 { 526 int cpu; 527 528 mutex_lock(&cpu_mutex); 529 530 for_each_possible_cpu(cpu) { 531 sysdev_remove_file(get_cpu_sysdev(cpu), attr); 532 } 533 534 mutex_unlock(&cpu_mutex); 535 } 536 EXPORT_SYMBOL_GPL(cpu_remove_sysdev_attr); 537 538 void cpu_remove_sysdev_attr_group(struct attribute_group *attrs) 539 { 540 int cpu; 541 struct sys_device *sysdev; 542 543 mutex_lock(&cpu_mutex); 544 545 for_each_possible_cpu(cpu) { 546 sysdev = get_cpu_sysdev(cpu); 547 sysfs_remove_group(&sysdev->kobj, attrs); 548 } 549 550 mutex_unlock(&cpu_mutex); 551 } 552 EXPORT_SYMBOL_GPL(cpu_remove_sysdev_attr_group); 553 554 555 /* NUMA stuff */ 556 557 #ifdef CONFIG_NUMA 558 static void register_nodes(void) 559 { 560 int i; 561 562 for (i = 0; i < MAX_NUMNODES; i++) 563 register_one_node(i); 564 } 565 566 int sysfs_add_device_to_node(struct sys_device *dev, int nid) 567 { 568 struct node *node = &node_devices[nid]; 569 return sysfs_create_link(&node->sysdev.kobj, &dev->kobj, 570 kobject_name(&dev->kobj)); 571 } 572 EXPORT_SYMBOL_GPL(sysfs_add_device_to_node); 573 574 void sysfs_remove_device_from_node(struct sys_device *dev, int nid) 575 { 576 struct node *node = &node_devices[nid]; 577 sysfs_remove_link(&node->sysdev.kobj, kobject_name(&dev->kobj)); 578 } 579 EXPORT_SYMBOL_GPL(sysfs_remove_device_from_node); 580 581 #else 582 static void register_nodes(void) 583 { 584 return; 585 } 586 587 #endif 588 589 /* Only valid if CPU is present. */ 590 static ssize_t show_physical_id(struct sys_device *dev, 591 struct sysdev_attribute *attr, char *buf) 592 { 593 struct cpu *cpu = container_of(dev, struct cpu, sysdev); 594 595 return sprintf(buf, "%d\n", get_hard_smp_processor_id(cpu->sysdev.id)); 596 } 597 static SYSDEV_ATTR(physical_id, 0444, show_physical_id, NULL); 598 599 static int __init topology_init(void) 600 { 601 int cpu; 602 603 register_nodes(); 604 register_cpu_notifier(&sysfs_cpu_nb); 605 606 for_each_possible_cpu(cpu) { 607 struct cpu *c = &per_cpu(cpu_devices, cpu); 608 609 /* 610 * For now, we just see if the system supports making 611 * the RTAS calls for CPU hotplug. But, there may be a 612 * more comprehensive way to do this for an individual 613 * CPU. For instance, the boot cpu might never be valid 614 * for hotplugging. 615 */ 616 if (ppc_md.cpu_die) 617 c->hotpluggable = 1; 618 619 if (cpu_online(cpu) || c->hotpluggable) { 620 register_cpu(c, cpu); 621 622 sysdev_create_file(&c->sysdev, &attr_physical_id); 623 } 624 625 if (cpu_online(cpu)) 626 register_cpu_online(cpu); 627 } 628 629 return 0; 630 } 631 subsys_initcall(topology_init); 632