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 #include <asm/pmc.h> 21 22 #include "cacheinfo.h" 23 24 #ifdef CONFIG_PPC64 25 #include <asm/paca.h> 26 #include <asm/lppaca.h> 27 #endif 28 29 static DEFINE_PER_CPU(struct cpu, cpu_devices); 30 31 /* 32 * SMT snooze delay stuff, 64-bit only for now 33 */ 34 35 #ifdef CONFIG_PPC64 36 37 /* Time in microseconds we delay before sleeping in the idle loop */ 38 DEFINE_PER_CPU(unsigned long, smt_snooze_delay) = { 100 }; 39 40 static ssize_t store_smt_snooze_delay(struct sys_device *dev, 41 struct sysdev_attribute *attr, 42 const char *buf, 43 size_t count) 44 { 45 struct cpu *cpu = container_of(dev, struct cpu, sysdev); 46 ssize_t ret; 47 unsigned long snooze; 48 49 ret = sscanf(buf, "%lu", &snooze); 50 if (ret != 1) 51 return -EINVAL; 52 53 per_cpu(smt_snooze_delay, cpu->sysdev.id) = snooze; 54 55 return count; 56 } 57 58 static ssize_t show_smt_snooze_delay(struct sys_device *dev, 59 struct sysdev_attribute *attr, 60 char *buf) 61 { 62 struct cpu *cpu = container_of(dev, struct cpu, sysdev); 63 64 return sprintf(buf, "%lu\n", per_cpu(smt_snooze_delay, cpu->sysdev.id)); 65 } 66 67 static SYSDEV_ATTR(smt_snooze_delay, 0644, show_smt_snooze_delay, 68 store_smt_snooze_delay); 69 70 /* Only parse OF options if the matching cmdline option was not specified */ 71 static int smt_snooze_cmdline; 72 73 static int __init smt_setup(void) 74 { 75 struct device_node *options; 76 const unsigned int *val; 77 unsigned int cpu; 78 79 if (!cpu_has_feature(CPU_FTR_SMT)) 80 return -ENODEV; 81 82 options = of_find_node_by_path("/options"); 83 if (!options) 84 return -ENODEV; 85 86 val = of_get_property(options, "ibm,smt-snooze-delay", NULL); 87 if (!smt_snooze_cmdline && val) { 88 for_each_possible_cpu(cpu) 89 per_cpu(smt_snooze_delay, cpu) = *val; 90 } 91 92 of_node_put(options); 93 return 0; 94 } 95 __initcall(smt_setup); 96 97 static int __init setup_smt_snooze_delay(char *str) 98 { 99 unsigned int cpu; 100 int snooze; 101 102 if (!cpu_has_feature(CPU_FTR_SMT)) 103 return 1; 104 105 smt_snooze_cmdline = 1; 106 107 if (get_option(&str, &snooze)) { 108 for_each_possible_cpu(cpu) 109 per_cpu(smt_snooze_delay, cpu) = snooze; 110 } 111 112 return 1; 113 } 114 __setup("smt-snooze-delay=", setup_smt_snooze_delay); 115 116 #endif /* CONFIG_PPC64 */ 117 118 /* 119 * Enabling PMCs will slow partition context switch times so we only do 120 * it the first time we write to the PMCs. 121 */ 122 123 static DEFINE_PER_CPU(char, pmcs_enabled); 124 125 void ppc_enable_pmcs(void) 126 { 127 ppc_set_pmu_inuse(1); 128 129 /* Only need to enable them once */ 130 if (__get_cpu_var(pmcs_enabled)) 131 return; 132 133 __get_cpu_var(pmcs_enabled) = 1; 134 135 if (ppc_md.enable_pmcs) 136 ppc_md.enable_pmcs(); 137 } 138 EXPORT_SYMBOL(ppc_enable_pmcs); 139 140 #define SYSFS_PMCSETUP(NAME, ADDRESS) \ 141 static void read_##NAME(void *val) \ 142 { \ 143 *(unsigned long *)val = mfspr(ADDRESS); \ 144 } \ 145 static void write_##NAME(void *val) \ 146 { \ 147 ppc_enable_pmcs(); \ 148 mtspr(ADDRESS, *(unsigned long *)val); \ 149 } \ 150 static ssize_t show_##NAME(struct sys_device *dev, \ 151 struct sysdev_attribute *attr, \ 152 char *buf) \ 153 { \ 154 struct cpu *cpu = container_of(dev, struct cpu, sysdev); \ 155 unsigned long val; \ 156 smp_call_function_single(cpu->sysdev.id, read_##NAME, &val, 1); \ 157 return sprintf(buf, "%lx\n", val); \ 158 } \ 159 static ssize_t __used \ 160 store_##NAME(struct sys_device *dev, struct sysdev_attribute *attr, \ 161 const char *buf, size_t count) \ 162 { \ 163 struct cpu *cpu = container_of(dev, struct cpu, sysdev); \ 164 unsigned long val; \ 165 int ret = sscanf(buf, "%lx", &val); \ 166 if (ret != 1) \ 167 return -EINVAL; \ 168 smp_call_function_single(cpu->sysdev.id, write_##NAME, &val, 1); \ 169 return count; \ 170 } 171 172 173 /* Let's define all possible registers, we'll only hook up the ones 174 * that are implemented on the current processor 175 */ 176 177 #if defined(CONFIG_PPC64) 178 #define HAS_PPC_PMC_CLASSIC 1 179 #define HAS_PPC_PMC_IBM 1 180 #define HAS_PPC_PMC_PA6T 1 181 #elif defined(CONFIG_6xx) 182 #define HAS_PPC_PMC_CLASSIC 1 183 #define HAS_PPC_PMC_IBM 1 184 #define HAS_PPC_PMC_G4 1 185 #endif 186 187 188 #ifdef HAS_PPC_PMC_CLASSIC 189 SYSFS_PMCSETUP(mmcr0, SPRN_MMCR0); 190 SYSFS_PMCSETUP(mmcr1, SPRN_MMCR1); 191 SYSFS_PMCSETUP(pmc1, SPRN_PMC1); 192 SYSFS_PMCSETUP(pmc2, SPRN_PMC2); 193 SYSFS_PMCSETUP(pmc3, SPRN_PMC3); 194 SYSFS_PMCSETUP(pmc4, SPRN_PMC4); 195 SYSFS_PMCSETUP(pmc5, SPRN_PMC5); 196 SYSFS_PMCSETUP(pmc6, SPRN_PMC6); 197 198 #ifdef HAS_PPC_PMC_G4 199 SYSFS_PMCSETUP(mmcr2, SPRN_MMCR2); 200 #endif 201 202 #ifdef CONFIG_PPC64 203 SYSFS_PMCSETUP(pmc7, SPRN_PMC7); 204 SYSFS_PMCSETUP(pmc8, SPRN_PMC8); 205 206 SYSFS_PMCSETUP(mmcra, SPRN_MMCRA); 207 SYSFS_PMCSETUP(purr, SPRN_PURR); 208 SYSFS_PMCSETUP(spurr, SPRN_SPURR); 209 SYSFS_PMCSETUP(dscr, SPRN_DSCR); 210 211 static SYSDEV_ATTR(mmcra, 0600, show_mmcra, store_mmcra); 212 static SYSDEV_ATTR(spurr, 0600, show_spurr, NULL); 213 static SYSDEV_ATTR(dscr, 0600, show_dscr, store_dscr); 214 static SYSDEV_ATTR(purr, 0600, show_purr, store_purr); 215 #endif /* CONFIG_PPC64 */ 216 217 #ifdef HAS_PPC_PMC_PA6T 218 SYSFS_PMCSETUP(pa6t_pmc0, SPRN_PA6T_PMC0); 219 SYSFS_PMCSETUP(pa6t_pmc1, SPRN_PA6T_PMC1); 220 SYSFS_PMCSETUP(pa6t_pmc2, SPRN_PA6T_PMC2); 221 SYSFS_PMCSETUP(pa6t_pmc3, SPRN_PA6T_PMC3); 222 SYSFS_PMCSETUP(pa6t_pmc4, SPRN_PA6T_PMC4); 223 SYSFS_PMCSETUP(pa6t_pmc5, SPRN_PA6T_PMC5); 224 #ifdef CONFIG_DEBUG_KERNEL 225 SYSFS_PMCSETUP(hid0, SPRN_HID0); 226 SYSFS_PMCSETUP(hid1, SPRN_HID1); 227 SYSFS_PMCSETUP(hid4, SPRN_HID4); 228 SYSFS_PMCSETUP(hid5, SPRN_HID5); 229 SYSFS_PMCSETUP(ima0, SPRN_PA6T_IMA0); 230 SYSFS_PMCSETUP(ima1, SPRN_PA6T_IMA1); 231 SYSFS_PMCSETUP(ima2, SPRN_PA6T_IMA2); 232 SYSFS_PMCSETUP(ima3, SPRN_PA6T_IMA3); 233 SYSFS_PMCSETUP(ima4, SPRN_PA6T_IMA4); 234 SYSFS_PMCSETUP(ima5, SPRN_PA6T_IMA5); 235 SYSFS_PMCSETUP(ima6, SPRN_PA6T_IMA6); 236 SYSFS_PMCSETUP(ima7, SPRN_PA6T_IMA7); 237 SYSFS_PMCSETUP(ima8, SPRN_PA6T_IMA8); 238 SYSFS_PMCSETUP(ima9, SPRN_PA6T_IMA9); 239 SYSFS_PMCSETUP(imaat, SPRN_PA6T_IMAAT); 240 SYSFS_PMCSETUP(btcr, SPRN_PA6T_BTCR); 241 SYSFS_PMCSETUP(pccr, SPRN_PA6T_PCCR); 242 SYSFS_PMCSETUP(rpccr, SPRN_PA6T_RPCCR); 243 SYSFS_PMCSETUP(der, SPRN_PA6T_DER); 244 SYSFS_PMCSETUP(mer, SPRN_PA6T_MER); 245 SYSFS_PMCSETUP(ber, SPRN_PA6T_BER); 246 SYSFS_PMCSETUP(ier, SPRN_PA6T_IER); 247 SYSFS_PMCSETUP(sier, SPRN_PA6T_SIER); 248 SYSFS_PMCSETUP(siar, SPRN_PA6T_SIAR); 249 SYSFS_PMCSETUP(tsr0, SPRN_PA6T_TSR0); 250 SYSFS_PMCSETUP(tsr1, SPRN_PA6T_TSR1); 251 SYSFS_PMCSETUP(tsr2, SPRN_PA6T_TSR2); 252 SYSFS_PMCSETUP(tsr3, SPRN_PA6T_TSR3); 253 #endif /* CONFIG_DEBUG_KERNEL */ 254 #endif /* HAS_PPC_PMC_PA6T */ 255 256 #ifdef HAS_PPC_PMC_IBM 257 static struct sysdev_attribute ibm_common_attrs[] = { 258 _SYSDEV_ATTR(mmcr0, 0600, show_mmcr0, store_mmcr0), 259 _SYSDEV_ATTR(mmcr1, 0600, show_mmcr1, store_mmcr1), 260 }; 261 #endif /* HAS_PPC_PMC_G4 */ 262 263 #ifdef HAS_PPC_PMC_G4 264 static struct sysdev_attribute g4_common_attrs[] = { 265 _SYSDEV_ATTR(mmcr0, 0600, show_mmcr0, store_mmcr0), 266 _SYSDEV_ATTR(mmcr1, 0600, show_mmcr1, store_mmcr1), 267 _SYSDEV_ATTR(mmcr2, 0600, show_mmcr2, store_mmcr2), 268 }; 269 #endif /* HAS_PPC_PMC_G4 */ 270 271 static struct sysdev_attribute classic_pmc_attrs[] = { 272 _SYSDEV_ATTR(pmc1, 0600, show_pmc1, store_pmc1), 273 _SYSDEV_ATTR(pmc2, 0600, show_pmc2, store_pmc2), 274 _SYSDEV_ATTR(pmc3, 0600, show_pmc3, store_pmc3), 275 _SYSDEV_ATTR(pmc4, 0600, show_pmc4, store_pmc4), 276 _SYSDEV_ATTR(pmc5, 0600, show_pmc5, store_pmc5), 277 _SYSDEV_ATTR(pmc6, 0600, show_pmc6, store_pmc6), 278 #ifdef CONFIG_PPC64 279 _SYSDEV_ATTR(pmc7, 0600, show_pmc7, store_pmc7), 280 _SYSDEV_ATTR(pmc8, 0600, show_pmc8, store_pmc8), 281 #endif 282 }; 283 284 #ifdef HAS_PPC_PMC_PA6T 285 static struct sysdev_attribute pa6t_attrs[] = { 286 _SYSDEV_ATTR(mmcr0, 0600, show_mmcr0, store_mmcr0), 287 _SYSDEV_ATTR(mmcr1, 0600, show_mmcr1, store_mmcr1), 288 _SYSDEV_ATTR(pmc0, 0600, show_pa6t_pmc0, store_pa6t_pmc0), 289 _SYSDEV_ATTR(pmc1, 0600, show_pa6t_pmc1, store_pa6t_pmc1), 290 _SYSDEV_ATTR(pmc2, 0600, show_pa6t_pmc2, store_pa6t_pmc2), 291 _SYSDEV_ATTR(pmc3, 0600, show_pa6t_pmc3, store_pa6t_pmc3), 292 _SYSDEV_ATTR(pmc4, 0600, show_pa6t_pmc4, store_pa6t_pmc4), 293 _SYSDEV_ATTR(pmc5, 0600, show_pa6t_pmc5, store_pa6t_pmc5), 294 #ifdef CONFIG_DEBUG_KERNEL 295 _SYSDEV_ATTR(hid0, 0600, show_hid0, store_hid0), 296 _SYSDEV_ATTR(hid1, 0600, show_hid1, store_hid1), 297 _SYSDEV_ATTR(hid4, 0600, show_hid4, store_hid4), 298 _SYSDEV_ATTR(hid5, 0600, show_hid5, store_hid5), 299 _SYSDEV_ATTR(ima0, 0600, show_ima0, store_ima0), 300 _SYSDEV_ATTR(ima1, 0600, show_ima1, store_ima1), 301 _SYSDEV_ATTR(ima2, 0600, show_ima2, store_ima2), 302 _SYSDEV_ATTR(ima3, 0600, show_ima3, store_ima3), 303 _SYSDEV_ATTR(ima4, 0600, show_ima4, store_ima4), 304 _SYSDEV_ATTR(ima5, 0600, show_ima5, store_ima5), 305 _SYSDEV_ATTR(ima6, 0600, show_ima6, store_ima6), 306 _SYSDEV_ATTR(ima7, 0600, show_ima7, store_ima7), 307 _SYSDEV_ATTR(ima8, 0600, show_ima8, store_ima8), 308 _SYSDEV_ATTR(ima9, 0600, show_ima9, store_ima9), 309 _SYSDEV_ATTR(imaat, 0600, show_imaat, store_imaat), 310 _SYSDEV_ATTR(btcr, 0600, show_btcr, store_btcr), 311 _SYSDEV_ATTR(pccr, 0600, show_pccr, store_pccr), 312 _SYSDEV_ATTR(rpccr, 0600, show_rpccr, store_rpccr), 313 _SYSDEV_ATTR(der, 0600, show_der, store_der), 314 _SYSDEV_ATTR(mer, 0600, show_mer, store_mer), 315 _SYSDEV_ATTR(ber, 0600, show_ber, store_ber), 316 _SYSDEV_ATTR(ier, 0600, show_ier, store_ier), 317 _SYSDEV_ATTR(sier, 0600, show_sier, store_sier), 318 _SYSDEV_ATTR(siar, 0600, show_siar, store_siar), 319 _SYSDEV_ATTR(tsr0, 0600, show_tsr0, store_tsr0), 320 _SYSDEV_ATTR(tsr1, 0600, show_tsr1, store_tsr1), 321 _SYSDEV_ATTR(tsr2, 0600, show_tsr2, store_tsr2), 322 _SYSDEV_ATTR(tsr3, 0600, show_tsr3, store_tsr3), 323 #endif /* CONFIG_DEBUG_KERNEL */ 324 }; 325 #endif /* HAS_PPC_PMC_PA6T */ 326 #endif /* HAS_PPC_PMC_CLASSIC */ 327 328 static void __cpuinit register_cpu_online(unsigned int cpu) 329 { 330 struct cpu *c = &per_cpu(cpu_devices, cpu); 331 struct sys_device *s = &c->sysdev; 332 struct sysdev_attribute *attrs, *pmc_attrs; 333 int i, nattrs; 334 335 #ifdef CONFIG_PPC64 336 if (!firmware_has_feature(FW_FEATURE_ISERIES) && 337 cpu_has_feature(CPU_FTR_SMT)) 338 sysdev_create_file(s, &attr_smt_snooze_delay); 339 #endif 340 341 /* PMC stuff */ 342 switch (cur_cpu_spec->pmc_type) { 343 #ifdef HAS_PPC_PMC_IBM 344 case PPC_PMC_IBM: 345 attrs = ibm_common_attrs; 346 nattrs = sizeof(ibm_common_attrs) / sizeof(struct sysdev_attribute); 347 pmc_attrs = classic_pmc_attrs; 348 break; 349 #endif /* HAS_PPC_PMC_IBM */ 350 #ifdef HAS_PPC_PMC_G4 351 case PPC_PMC_G4: 352 attrs = g4_common_attrs; 353 nattrs = sizeof(g4_common_attrs) / sizeof(struct sysdev_attribute); 354 pmc_attrs = classic_pmc_attrs; 355 break; 356 #endif /* HAS_PPC_PMC_G4 */ 357 #ifdef HAS_PPC_PMC_PA6T 358 case PPC_PMC_PA6T: 359 /* PA Semi starts counting at PMC0 */ 360 attrs = pa6t_attrs; 361 nattrs = sizeof(pa6t_attrs) / sizeof(struct sysdev_attribute); 362 pmc_attrs = NULL; 363 break; 364 #endif /* HAS_PPC_PMC_PA6T */ 365 default: 366 attrs = NULL; 367 nattrs = 0; 368 pmc_attrs = NULL; 369 } 370 371 for (i = 0; i < nattrs; i++) 372 sysdev_create_file(s, &attrs[i]); 373 374 if (pmc_attrs) 375 for (i = 0; i < cur_cpu_spec->num_pmcs; i++) 376 sysdev_create_file(s, &pmc_attrs[i]); 377 378 #ifdef CONFIG_PPC64 379 if (cpu_has_feature(CPU_FTR_MMCRA)) 380 sysdev_create_file(s, &attr_mmcra); 381 382 if (cpu_has_feature(CPU_FTR_PURR)) 383 sysdev_create_file(s, &attr_purr); 384 385 if (cpu_has_feature(CPU_FTR_SPURR)) 386 sysdev_create_file(s, &attr_spurr); 387 388 if (cpu_has_feature(CPU_FTR_DSCR)) 389 sysdev_create_file(s, &attr_dscr); 390 #endif /* CONFIG_PPC64 */ 391 392 cacheinfo_cpu_online(cpu); 393 } 394 395 #ifdef CONFIG_HOTPLUG_CPU 396 static void unregister_cpu_online(unsigned int cpu) 397 { 398 struct cpu *c = &per_cpu(cpu_devices, cpu); 399 struct sys_device *s = &c->sysdev; 400 struct sysdev_attribute *attrs, *pmc_attrs; 401 int i, nattrs; 402 403 BUG_ON(!c->hotpluggable); 404 405 #ifdef CONFIG_PPC64 406 if (!firmware_has_feature(FW_FEATURE_ISERIES) && 407 cpu_has_feature(CPU_FTR_SMT)) 408 sysdev_remove_file(s, &attr_smt_snooze_delay); 409 #endif 410 411 /* PMC stuff */ 412 switch (cur_cpu_spec->pmc_type) { 413 #ifdef HAS_PPC_PMC_IBM 414 case PPC_PMC_IBM: 415 attrs = ibm_common_attrs; 416 nattrs = sizeof(ibm_common_attrs) / sizeof(struct sysdev_attribute); 417 pmc_attrs = classic_pmc_attrs; 418 break; 419 #endif /* HAS_PPC_PMC_IBM */ 420 #ifdef HAS_PPC_PMC_G4 421 case PPC_PMC_G4: 422 attrs = g4_common_attrs; 423 nattrs = sizeof(g4_common_attrs) / sizeof(struct sysdev_attribute); 424 pmc_attrs = classic_pmc_attrs; 425 break; 426 #endif /* HAS_PPC_PMC_G4 */ 427 #ifdef HAS_PPC_PMC_PA6T 428 case PPC_PMC_PA6T: 429 /* PA Semi starts counting at PMC0 */ 430 attrs = pa6t_attrs; 431 nattrs = sizeof(pa6t_attrs) / sizeof(struct sysdev_attribute); 432 pmc_attrs = NULL; 433 break; 434 #endif /* HAS_PPC_PMC_PA6T */ 435 default: 436 attrs = NULL; 437 nattrs = 0; 438 pmc_attrs = NULL; 439 } 440 441 for (i = 0; i < nattrs; i++) 442 sysdev_remove_file(s, &attrs[i]); 443 444 if (pmc_attrs) 445 for (i = 0; i < cur_cpu_spec->num_pmcs; i++) 446 sysdev_remove_file(s, &pmc_attrs[i]); 447 448 #ifdef CONFIG_PPC64 449 if (cpu_has_feature(CPU_FTR_MMCRA)) 450 sysdev_remove_file(s, &attr_mmcra); 451 452 if (cpu_has_feature(CPU_FTR_PURR)) 453 sysdev_remove_file(s, &attr_purr); 454 455 if (cpu_has_feature(CPU_FTR_SPURR)) 456 sysdev_remove_file(s, &attr_spurr); 457 458 if (cpu_has_feature(CPU_FTR_DSCR)) 459 sysdev_remove_file(s, &attr_dscr); 460 #endif /* CONFIG_PPC64 */ 461 462 cacheinfo_cpu_offline(cpu); 463 } 464 #endif /* CONFIG_HOTPLUG_CPU */ 465 466 static int __cpuinit sysfs_cpu_notify(struct notifier_block *self, 467 unsigned long action, void *hcpu) 468 { 469 unsigned int cpu = (unsigned int)(long)hcpu; 470 471 switch (action) { 472 case CPU_ONLINE: 473 case CPU_ONLINE_FROZEN: 474 register_cpu_online(cpu); 475 break; 476 #ifdef CONFIG_HOTPLUG_CPU 477 case CPU_DEAD: 478 case CPU_DEAD_FROZEN: 479 unregister_cpu_online(cpu); 480 break; 481 #endif 482 } 483 return NOTIFY_OK; 484 } 485 486 static struct notifier_block __cpuinitdata sysfs_cpu_nb = { 487 .notifier_call = sysfs_cpu_notify, 488 }; 489 490 static DEFINE_MUTEX(cpu_mutex); 491 492 int cpu_add_sysdev_attr(struct sysdev_attribute *attr) 493 { 494 int cpu; 495 496 mutex_lock(&cpu_mutex); 497 498 for_each_possible_cpu(cpu) { 499 sysdev_create_file(get_cpu_sysdev(cpu), attr); 500 } 501 502 mutex_unlock(&cpu_mutex); 503 return 0; 504 } 505 EXPORT_SYMBOL_GPL(cpu_add_sysdev_attr); 506 507 int cpu_add_sysdev_attr_group(struct attribute_group *attrs) 508 { 509 int cpu; 510 struct sys_device *sysdev; 511 int ret; 512 513 mutex_lock(&cpu_mutex); 514 515 for_each_possible_cpu(cpu) { 516 sysdev = get_cpu_sysdev(cpu); 517 ret = sysfs_create_group(&sysdev->kobj, attrs); 518 WARN_ON(ret != 0); 519 } 520 521 mutex_unlock(&cpu_mutex); 522 return 0; 523 } 524 EXPORT_SYMBOL_GPL(cpu_add_sysdev_attr_group); 525 526 527 void cpu_remove_sysdev_attr(struct sysdev_attribute *attr) 528 { 529 int cpu; 530 531 mutex_lock(&cpu_mutex); 532 533 for_each_possible_cpu(cpu) { 534 sysdev_remove_file(get_cpu_sysdev(cpu), attr); 535 } 536 537 mutex_unlock(&cpu_mutex); 538 } 539 EXPORT_SYMBOL_GPL(cpu_remove_sysdev_attr); 540 541 void cpu_remove_sysdev_attr_group(struct attribute_group *attrs) 542 { 543 int cpu; 544 struct sys_device *sysdev; 545 546 mutex_lock(&cpu_mutex); 547 548 for_each_possible_cpu(cpu) { 549 sysdev = get_cpu_sysdev(cpu); 550 sysfs_remove_group(&sysdev->kobj, attrs); 551 } 552 553 mutex_unlock(&cpu_mutex); 554 } 555 EXPORT_SYMBOL_GPL(cpu_remove_sysdev_attr_group); 556 557 558 /* NUMA stuff */ 559 560 #ifdef CONFIG_NUMA 561 static void register_nodes(void) 562 { 563 int i; 564 565 for (i = 0; i < MAX_NUMNODES; i++) 566 register_one_node(i); 567 } 568 569 int sysfs_add_device_to_node(struct sys_device *dev, int nid) 570 { 571 struct node *node = &node_devices[nid]; 572 return sysfs_create_link(&node->sysdev.kobj, &dev->kobj, 573 kobject_name(&dev->kobj)); 574 } 575 EXPORT_SYMBOL_GPL(sysfs_add_device_to_node); 576 577 void sysfs_remove_device_from_node(struct sys_device *dev, int nid) 578 { 579 struct node *node = &node_devices[nid]; 580 sysfs_remove_link(&node->sysdev.kobj, kobject_name(&dev->kobj)); 581 } 582 EXPORT_SYMBOL_GPL(sysfs_remove_device_from_node); 583 584 #else 585 static void register_nodes(void) 586 { 587 return; 588 } 589 590 #endif 591 592 /* Only valid if CPU is present. */ 593 static ssize_t show_physical_id(struct sys_device *dev, 594 struct sysdev_attribute *attr, char *buf) 595 { 596 struct cpu *cpu = container_of(dev, struct cpu, sysdev); 597 598 return sprintf(buf, "%d\n", get_hard_smp_processor_id(cpu->sysdev.id)); 599 } 600 static SYSDEV_ATTR(physical_id, 0444, show_physical_id, NULL); 601 602 static int __init topology_init(void) 603 { 604 int cpu; 605 606 register_nodes(); 607 register_cpu_notifier(&sysfs_cpu_nb); 608 609 for_each_possible_cpu(cpu) { 610 struct cpu *c = &per_cpu(cpu_devices, cpu); 611 612 /* 613 * For now, we just see if the system supports making 614 * the RTAS calls for CPU hotplug. But, there may be a 615 * more comprehensive way to do this for an individual 616 * CPU. For instance, the boot cpu might never be valid 617 * for hotplugging. 618 */ 619 if (ppc_md.cpu_die) 620 c->hotpluggable = 1; 621 622 if (cpu_online(cpu) || c->hotpluggable) { 623 register_cpu(c, cpu); 624 625 sysdev_create_file(&c->sysdev, &attr_physical_id); 626 } 627 628 if (cpu_online(cpu)) 629 register_cpu_online(cpu); 630 } 631 632 return 0; 633 } 634 subsys_initcall(topology_init); 635