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 #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 static void __cpuinit register_cpu_online(unsigned int cpu) 347 { 348 struct cpu *c = &per_cpu(cpu_devices, cpu); 349 struct sys_device *s = &c->sysdev; 350 struct sysdev_attribute *attrs, *pmc_attrs; 351 int i, nattrs; 352 353 #ifdef CONFIG_PPC64 354 if (!firmware_has_feature(FW_FEATURE_ISERIES) && 355 cpu_has_feature(CPU_FTR_SMT)) 356 sysdev_create_file(s, &attr_smt_snooze_delay); 357 #endif 358 359 /* PMC stuff */ 360 switch (cur_cpu_spec->pmc_type) { 361 #ifdef HAS_PPC_PMC_IBM 362 case PPC_PMC_IBM: 363 attrs = ibm_common_attrs; 364 nattrs = sizeof(ibm_common_attrs) / sizeof(struct sysdev_attribute); 365 pmc_attrs = classic_pmc_attrs; 366 break; 367 #endif /* HAS_PPC_PMC_IBM */ 368 #ifdef HAS_PPC_PMC_G4 369 case PPC_PMC_G4: 370 attrs = g4_common_attrs; 371 nattrs = sizeof(g4_common_attrs) / sizeof(struct sysdev_attribute); 372 pmc_attrs = classic_pmc_attrs; 373 break; 374 #endif /* HAS_PPC_PMC_G4 */ 375 #ifdef HAS_PPC_PMC_PA6T 376 case PPC_PMC_PA6T: 377 /* PA Semi starts counting at PMC0 */ 378 attrs = pa6t_attrs; 379 nattrs = sizeof(pa6t_attrs) / sizeof(struct sysdev_attribute); 380 pmc_attrs = NULL; 381 break; 382 #endif /* HAS_PPC_PMC_PA6T */ 383 default: 384 attrs = NULL; 385 nattrs = 0; 386 pmc_attrs = NULL; 387 } 388 389 for (i = 0; i < nattrs; i++) 390 sysdev_create_file(s, &attrs[i]); 391 392 if (pmc_attrs) 393 for (i = 0; i < cur_cpu_spec->num_pmcs; i++) 394 sysdev_create_file(s, &pmc_attrs[i]); 395 396 #ifdef CONFIG_PPC64 397 if (cpu_has_feature(CPU_FTR_MMCRA)) 398 sysdev_create_file(s, &attr_mmcra); 399 400 if (cpu_has_feature(CPU_FTR_PURR)) 401 sysdev_create_file(s, &attr_purr); 402 403 if (cpu_has_feature(CPU_FTR_SPURR)) 404 sysdev_create_file(s, &attr_spurr); 405 406 if (cpu_has_feature(CPU_FTR_DSCR)) 407 sysdev_create_file(s, &attr_dscr); 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 sys_device *s = &c->sysdev; 418 struct sysdev_attribute *attrs, *pmc_attrs; 419 int i, nattrs; 420 421 BUG_ON(!c->hotpluggable); 422 423 #ifdef CONFIG_PPC64 424 if (!firmware_has_feature(FW_FEATURE_ISERIES) && 425 cpu_has_feature(CPU_FTR_SMT)) 426 sysdev_remove_file(s, &attr_smt_snooze_delay); 427 #endif 428 429 /* PMC stuff */ 430 switch (cur_cpu_spec->pmc_type) { 431 #ifdef HAS_PPC_PMC_IBM 432 case PPC_PMC_IBM: 433 attrs = ibm_common_attrs; 434 nattrs = sizeof(ibm_common_attrs) / sizeof(struct sysdev_attribute); 435 pmc_attrs = classic_pmc_attrs; 436 break; 437 #endif /* HAS_PPC_PMC_IBM */ 438 #ifdef HAS_PPC_PMC_G4 439 case PPC_PMC_G4: 440 attrs = g4_common_attrs; 441 nattrs = sizeof(g4_common_attrs) / sizeof(struct sysdev_attribute); 442 pmc_attrs = classic_pmc_attrs; 443 break; 444 #endif /* HAS_PPC_PMC_G4 */ 445 #ifdef HAS_PPC_PMC_PA6T 446 case PPC_PMC_PA6T: 447 /* PA Semi starts counting at PMC0 */ 448 attrs = pa6t_attrs; 449 nattrs = sizeof(pa6t_attrs) / sizeof(struct sysdev_attribute); 450 pmc_attrs = NULL; 451 break; 452 #endif /* HAS_PPC_PMC_PA6T */ 453 default: 454 attrs = NULL; 455 nattrs = 0; 456 pmc_attrs = NULL; 457 } 458 459 for (i = 0; i < nattrs; i++) 460 sysdev_remove_file(s, &attrs[i]); 461 462 if (pmc_attrs) 463 for (i = 0; i < cur_cpu_spec->num_pmcs; i++) 464 sysdev_remove_file(s, &pmc_attrs[i]); 465 466 #ifdef CONFIG_PPC64 467 if (cpu_has_feature(CPU_FTR_MMCRA)) 468 sysdev_remove_file(s, &attr_mmcra); 469 470 if (cpu_has_feature(CPU_FTR_PURR)) 471 sysdev_remove_file(s, &attr_purr); 472 473 if (cpu_has_feature(CPU_FTR_SPURR)) 474 sysdev_remove_file(s, &attr_spurr); 475 476 if (cpu_has_feature(CPU_FTR_DSCR)) 477 sysdev_remove_file(s, &attr_dscr); 478 #endif /* CONFIG_PPC64 */ 479 480 cacheinfo_cpu_offline(cpu); 481 } 482 #endif /* CONFIG_HOTPLUG_CPU */ 483 484 static int __cpuinit sysfs_cpu_notify(struct notifier_block *self, 485 unsigned long action, void *hcpu) 486 { 487 unsigned int cpu = (unsigned int)(long)hcpu; 488 489 switch (action) { 490 case CPU_ONLINE: 491 case CPU_ONLINE_FROZEN: 492 register_cpu_online(cpu); 493 break; 494 #ifdef CONFIG_HOTPLUG_CPU 495 case CPU_DEAD: 496 case CPU_DEAD_FROZEN: 497 unregister_cpu_online(cpu); 498 break; 499 #endif 500 } 501 return NOTIFY_OK; 502 } 503 504 static struct notifier_block __cpuinitdata sysfs_cpu_nb = { 505 .notifier_call = sysfs_cpu_notify, 506 }; 507 508 static DEFINE_MUTEX(cpu_mutex); 509 510 int cpu_add_sysdev_attr(struct sysdev_attribute *attr) 511 { 512 int cpu; 513 514 mutex_lock(&cpu_mutex); 515 516 for_each_possible_cpu(cpu) { 517 sysdev_create_file(get_cpu_sysdev(cpu), attr); 518 } 519 520 mutex_unlock(&cpu_mutex); 521 return 0; 522 } 523 EXPORT_SYMBOL_GPL(cpu_add_sysdev_attr); 524 525 int cpu_add_sysdev_attr_group(struct attribute_group *attrs) 526 { 527 int cpu; 528 struct sys_device *sysdev; 529 int ret; 530 531 mutex_lock(&cpu_mutex); 532 533 for_each_possible_cpu(cpu) { 534 sysdev = get_cpu_sysdev(cpu); 535 ret = sysfs_create_group(&sysdev->kobj, attrs); 536 WARN_ON(ret != 0); 537 } 538 539 mutex_unlock(&cpu_mutex); 540 return 0; 541 } 542 EXPORT_SYMBOL_GPL(cpu_add_sysdev_attr_group); 543 544 545 void cpu_remove_sysdev_attr(struct sysdev_attribute *attr) 546 { 547 int cpu; 548 549 mutex_lock(&cpu_mutex); 550 551 for_each_possible_cpu(cpu) { 552 sysdev_remove_file(get_cpu_sysdev(cpu), attr); 553 } 554 555 mutex_unlock(&cpu_mutex); 556 } 557 EXPORT_SYMBOL_GPL(cpu_remove_sysdev_attr); 558 559 void cpu_remove_sysdev_attr_group(struct attribute_group *attrs) 560 { 561 int cpu; 562 struct sys_device *sysdev; 563 564 mutex_lock(&cpu_mutex); 565 566 for_each_possible_cpu(cpu) { 567 sysdev = get_cpu_sysdev(cpu); 568 sysfs_remove_group(&sysdev->kobj, attrs); 569 } 570 571 mutex_unlock(&cpu_mutex); 572 } 573 EXPORT_SYMBOL_GPL(cpu_remove_sysdev_attr_group); 574 575 576 /* NUMA stuff */ 577 578 #ifdef CONFIG_NUMA 579 static void register_nodes(void) 580 { 581 int i; 582 583 for (i = 0; i < MAX_NUMNODES; i++) 584 register_one_node(i); 585 } 586 587 int sysfs_add_device_to_node(struct sys_device *dev, int nid) 588 { 589 struct node *node = &node_devices[nid]; 590 return sysfs_create_link(&node->sysdev.kobj, &dev->kobj, 591 kobject_name(&dev->kobj)); 592 } 593 EXPORT_SYMBOL_GPL(sysfs_add_device_to_node); 594 595 void sysfs_remove_device_from_node(struct sys_device *dev, int nid) 596 { 597 struct node *node = &node_devices[nid]; 598 sysfs_remove_link(&node->sysdev.kobj, kobject_name(&dev->kobj)); 599 } 600 EXPORT_SYMBOL_GPL(sysfs_remove_device_from_node); 601 602 #else 603 static void register_nodes(void) 604 { 605 return; 606 } 607 608 #endif 609 610 /* Only valid if CPU is present. */ 611 static ssize_t show_physical_id(struct sys_device *dev, 612 struct sysdev_attribute *attr, char *buf) 613 { 614 struct cpu *cpu = container_of(dev, struct cpu, sysdev); 615 616 return sprintf(buf, "%d\n", get_hard_smp_processor_id(cpu->sysdev.id)); 617 } 618 static SYSDEV_ATTR(physical_id, 0444, show_physical_id, NULL); 619 620 static int __init topology_init(void) 621 { 622 int cpu; 623 624 register_nodes(); 625 register_cpu_notifier(&sysfs_cpu_nb); 626 627 for_each_possible_cpu(cpu) { 628 struct cpu *c = &per_cpu(cpu_devices, cpu); 629 630 /* 631 * For now, we just see if the system supports making 632 * the RTAS calls for CPU hotplug. But, there may be a 633 * more comprehensive way to do this for an individual 634 * CPU. For instance, the boot cpu might never be valid 635 * for hotplugging. 636 */ 637 if (ppc_md.cpu_die) 638 c->hotpluggable = 1; 639 640 if (cpu_online(cpu) || c->hotpluggable) { 641 register_cpu(c, cpu); 642 643 sysdev_create_file(&c->sysdev, &attr_physical_id); 644 } 645 646 if (cpu_online(cpu)) 647 register_cpu_online(cpu); 648 } 649 650 return 0; 651 } 652 subsys_initcall(topology_init); 653