| 1 | /* |
| 2 | * SMP support for ppc. |
| 3 | * |
| 4 | * Written by Cort Dougan (cort@cs.nmt.edu) borrowing a great |
| 5 | * deal of code from the sparc and intel versions. |
| 6 | * |
| 7 | * Copyright (C) 1999 Cort Dougan <cort@cs.nmt.edu> |
| 8 | * |
| 9 | * PowerPC-64 Support added by Dave Engebretsen, Peter Bergner, and |
| 10 | * Mike Corrigan {engebret|bergner|mikec}@us.ibm.com |
| 11 | * |
| 12 | * This program is free software; you can redistribute it and/or |
| 13 | * modify it under the terms of the GNU General Public License |
| 14 | * as published by the Free Software Foundation; either version |
| 15 | * 2 of the License, or (at your option) any later version. |
| 16 | */ |
| 17 | |
| 18 | #undef DEBUG |
| 19 | |
| 20 | #include <linux/kernel.h> |
| 21 | #include <linux/module.h> |
| 22 | #include <linux/sched.h> |
| 23 | #include <linux/smp.h> |
| 24 | #include <linux/interrupt.h> |
| 25 | #include <linux/delay.h> |
| 26 | #include <linux/init.h> |
| 27 | #include <linux/spinlock.h> |
| 28 | #include <linux/cache.h> |
| 29 | #include <linux/err.h> |
| 30 | #include <linux/sysdev.h> |
| 31 | #include <linux/cpu.h> |
| 32 | #include <linux/notifier.h> |
| 33 | #include <linux/topology.h> |
| 34 | |
| 35 | #include <asm/ptrace.h> |
| 36 | #include <asm/atomic.h> |
| 37 | #include <asm/irq.h> |
| 38 | #include <asm/page.h> |
| 39 | #include <asm/pgtable.h> |
| 40 | #include <asm/prom.h> |
| 41 | #include <asm/smp.h> |
| 42 | #include <asm/time.h> |
| 43 | #include <asm/machdep.h> |
| 44 | #include <asm/cputhreads.h> |
| 45 | #include <asm/cputable.h> |
| 46 | #include <asm/system.h> |
| 47 | #include <asm/mpic.h> |
| 48 | #include <asm/vdso_datapage.h> |
| 49 | #ifdef CONFIG_PPC64 |
| 50 | #include <asm/paca.h> |
| 51 | #endif |
| 52 | |
| 53 | #ifdef DEBUG |
| 54 | #include <asm/udbg.h> |
| 55 | #define DBG(fmt...) udbg_printf(fmt) |
| 56 | #else |
| 57 | #define DBG(fmt...) |
| 58 | #endif |
| 59 | |
| 60 | struct thread_info *secondary_ti; |
| 61 | |
| 62 | DEFINE_PER_CPU(cpumask_t, cpu_sibling_map) = CPU_MASK_NONE; |
| 63 | DEFINE_PER_CPU(cpumask_t, cpu_core_map) = CPU_MASK_NONE; |
| 64 | |
| 65 | EXPORT_PER_CPU_SYMBOL(cpu_sibling_map); |
| 66 | EXPORT_PER_CPU_SYMBOL(cpu_core_map); |
| 67 | |
| 68 | /* SMP operations for this machine */ |
| 69 | struct smp_ops_t *smp_ops; |
| 70 | |
| 71 | /* Can't be static due to PowerMac hackery */ |
| 72 | volatile unsigned int cpu_callin_map[NR_CPUS]; |
| 73 | |
| 74 | int smt_enabled_at_boot = 1; |
| 75 | |
| 76 | static void (*crash_ipi_function_ptr)(struct pt_regs *) = NULL; |
| 77 | |
| 78 | #ifdef CONFIG_PPC64 |
| 79 | void __devinit smp_generic_kick_cpu(int nr) |
| 80 | { |
| 81 | BUG_ON(nr < 0 || nr >= NR_CPUS); |
| 82 | |
| 83 | /* |
| 84 | * The processor is currently spinning, waiting for the |
| 85 | * cpu_start field to become non-zero After we set cpu_start, |
| 86 | * the processor will continue on to secondary_start |
| 87 | */ |
| 88 | paca[nr].cpu_start = 1; |
| 89 | smp_mb(); |
| 90 | } |
| 91 | #endif |
| 92 | |
| 93 | void smp_message_recv(int msg) |
| 94 | { |
| 95 | switch(msg) { |
| 96 | case PPC_MSG_CALL_FUNCTION: |
| 97 | generic_smp_call_function_interrupt(); |
| 98 | break; |
| 99 | case PPC_MSG_RESCHEDULE: |
| 100 | /* we notice need_resched on exit */ |
| 101 | break; |
| 102 | case PPC_MSG_CALL_FUNC_SINGLE: |
| 103 | generic_smp_call_function_single_interrupt(); |
| 104 | break; |
| 105 | case PPC_MSG_DEBUGGER_BREAK: |
| 106 | if (crash_ipi_function_ptr) { |
| 107 | crash_ipi_function_ptr(get_irq_regs()); |
| 108 | break; |
| 109 | } |
| 110 | #ifdef CONFIG_DEBUGGER |
| 111 | debugger_ipi(get_irq_regs()); |
| 112 | break; |
| 113 | #endif /* CONFIG_DEBUGGER */ |
| 114 | /* FALLTHROUGH */ |
| 115 | default: |
| 116 | printk("SMP %d: smp_message_recv(): unknown msg %d\n", |
| 117 | smp_processor_id(), msg); |
| 118 | break; |
| 119 | } |
| 120 | } |
| 121 | |
| 122 | static irqreturn_t call_function_action(int irq, void *data) |
| 123 | { |
| 124 | generic_smp_call_function_interrupt(); |
| 125 | return IRQ_HANDLED; |
| 126 | } |
| 127 | |
| 128 | static irqreturn_t reschedule_action(int irq, void *data) |
| 129 | { |
| 130 | /* we just need the return path side effect of checking need_resched */ |
| 131 | return IRQ_HANDLED; |
| 132 | } |
| 133 | |
| 134 | static irqreturn_t call_function_single_action(int irq, void *data) |
| 135 | { |
| 136 | generic_smp_call_function_single_interrupt(); |
| 137 | return IRQ_HANDLED; |
| 138 | } |
| 139 | |
| 140 | static irqreturn_t debug_ipi_action(int irq, void *data) |
| 141 | { |
| 142 | smp_message_recv(PPC_MSG_DEBUGGER_BREAK); |
| 143 | return IRQ_HANDLED; |
| 144 | } |
| 145 | |
| 146 | static irq_handler_t smp_ipi_action[] = { |
| 147 | [PPC_MSG_CALL_FUNCTION] = call_function_action, |
| 148 | [PPC_MSG_RESCHEDULE] = reschedule_action, |
| 149 | [PPC_MSG_CALL_FUNC_SINGLE] = call_function_single_action, |
| 150 | [PPC_MSG_DEBUGGER_BREAK] = debug_ipi_action, |
| 151 | }; |
| 152 | |
| 153 | const char *smp_ipi_name[] = { |
| 154 | [PPC_MSG_CALL_FUNCTION] = "ipi call function", |
| 155 | [PPC_MSG_RESCHEDULE] = "ipi reschedule", |
| 156 | [PPC_MSG_CALL_FUNC_SINGLE] = "ipi call function single", |
| 157 | [PPC_MSG_DEBUGGER_BREAK] = "ipi debugger", |
| 158 | }; |
| 159 | |
| 160 | /* optional function to request ipi, for controllers with >= 4 ipis */ |
| 161 | int smp_request_message_ipi(int virq, int msg) |
| 162 | { |
| 163 | int err; |
| 164 | |
| 165 | if (msg < 0 || msg > PPC_MSG_DEBUGGER_BREAK) { |
| 166 | return -EINVAL; |
| 167 | } |
| 168 | #if !defined(CONFIG_DEBUGGER) && !defined(CONFIG_KEXEC) |
| 169 | if (msg == PPC_MSG_DEBUGGER_BREAK) { |
| 170 | return 1; |
| 171 | } |
| 172 | #endif |
| 173 | err = request_irq(virq, smp_ipi_action[msg], IRQF_DISABLED|IRQF_PERCPU, |
| 174 | smp_ipi_name[msg], 0); |
| 175 | WARN(err < 0, "unable to request_irq %d for %s (rc %d)\n", |
| 176 | virq, smp_ipi_name[msg], err); |
| 177 | |
| 178 | return err; |
| 179 | } |
| 180 | |
| 181 | void smp_send_reschedule(int cpu) |
| 182 | { |
| 183 | if (likely(smp_ops)) |
| 184 | smp_ops->message_pass(cpu, PPC_MSG_RESCHEDULE); |
| 185 | } |
| 186 | |
| 187 | void arch_send_call_function_single_ipi(int cpu) |
| 188 | { |
| 189 | smp_ops->message_pass(cpu, PPC_MSG_CALL_FUNC_SINGLE); |
| 190 | } |
| 191 | |
| 192 | void arch_send_call_function_ipi_mask(const struct cpumask *mask) |
| 193 | { |
| 194 | unsigned int cpu; |
| 195 | |
| 196 | for_each_cpu(cpu, mask) |
| 197 | smp_ops->message_pass(cpu, PPC_MSG_CALL_FUNCTION); |
| 198 | } |
| 199 | |
| 200 | #ifdef CONFIG_DEBUGGER |
| 201 | void smp_send_debugger_break(int cpu) |
| 202 | { |
| 203 | if (likely(smp_ops)) |
| 204 | smp_ops->message_pass(cpu, PPC_MSG_DEBUGGER_BREAK); |
| 205 | } |
| 206 | #endif |
| 207 | |
| 208 | #ifdef CONFIG_KEXEC |
| 209 | void crash_send_ipi(void (*crash_ipi_callback)(struct pt_regs *)) |
| 210 | { |
| 211 | crash_ipi_function_ptr = crash_ipi_callback; |
| 212 | if (crash_ipi_callback && smp_ops) { |
| 213 | mb(); |
| 214 | smp_ops->message_pass(MSG_ALL_BUT_SELF, PPC_MSG_DEBUGGER_BREAK); |
| 215 | } |
| 216 | } |
| 217 | #endif |
| 218 | |
| 219 | static void stop_this_cpu(void *dummy) |
| 220 | { |
| 221 | /* Remove this CPU */ |
| 222 | set_cpu_online(smp_processor_id(), false); |
| 223 | |
| 224 | local_irq_disable(); |
| 225 | while (1) |
| 226 | ; |
| 227 | } |
| 228 | |
| 229 | void smp_send_stop(void) |
| 230 | { |
| 231 | smp_call_function(stop_this_cpu, NULL, 0); |
| 232 | } |
| 233 | |
| 234 | struct thread_info *current_set[NR_CPUS]; |
| 235 | |
| 236 | static void __devinit smp_store_cpu_info(int id) |
| 237 | { |
| 238 | per_cpu(cpu_pvr, id) = mfspr(SPRN_PVR); |
| 239 | } |
| 240 | |
| 241 | static void __init smp_create_idle(unsigned int cpu) |
| 242 | { |
| 243 | struct task_struct *p; |
| 244 | |
| 245 | /* create a process for the processor */ |
| 246 | p = fork_idle(cpu); |
| 247 | if (IS_ERR(p)) |
| 248 | panic("failed fork for CPU %u: %li", cpu, PTR_ERR(p)); |
| 249 | #ifdef CONFIG_PPC64 |
| 250 | paca[cpu].__current = p; |
| 251 | paca[cpu].kstack = (unsigned long) task_thread_info(p) |
| 252 | + THREAD_SIZE - STACK_FRAME_OVERHEAD; |
| 253 | #endif |
| 254 | current_set[cpu] = task_thread_info(p); |
| 255 | task_thread_info(p)->cpu = cpu; |
| 256 | } |
| 257 | |
| 258 | void __init smp_prepare_cpus(unsigned int max_cpus) |
| 259 | { |
| 260 | unsigned int cpu; |
| 261 | |
| 262 | DBG("smp_prepare_cpus\n"); |
| 263 | |
| 264 | /* |
| 265 | * setup_cpu may need to be called on the boot cpu. We havent |
| 266 | * spun any cpus up but lets be paranoid. |
| 267 | */ |
| 268 | BUG_ON(boot_cpuid != smp_processor_id()); |
| 269 | |
| 270 | /* Fixup boot cpu */ |
| 271 | smp_store_cpu_info(boot_cpuid); |
| 272 | cpu_callin_map[boot_cpuid] = 1; |
| 273 | |
| 274 | if (smp_ops) |
| 275 | if (smp_ops->probe) |
| 276 | max_cpus = smp_ops->probe(); |
| 277 | else |
| 278 | max_cpus = NR_CPUS; |
| 279 | else |
| 280 | max_cpus = 1; |
| 281 | |
| 282 | smp_space_timers(max_cpus); |
| 283 | |
| 284 | for_each_possible_cpu(cpu) |
| 285 | if (cpu != boot_cpuid) |
| 286 | smp_create_idle(cpu); |
| 287 | } |
| 288 | |
| 289 | void __devinit smp_prepare_boot_cpu(void) |
| 290 | { |
| 291 | BUG_ON(smp_processor_id() != boot_cpuid); |
| 292 | |
| 293 | set_cpu_online(boot_cpuid, true); |
| 294 | cpu_set(boot_cpuid, per_cpu(cpu_sibling_map, boot_cpuid)); |
| 295 | cpu_set(boot_cpuid, per_cpu(cpu_core_map, boot_cpuid)); |
| 296 | #ifdef CONFIG_PPC64 |
| 297 | paca[boot_cpuid].__current = current; |
| 298 | #endif |
| 299 | current_set[boot_cpuid] = task_thread_info(current); |
| 300 | } |
| 301 | |
| 302 | #ifdef CONFIG_HOTPLUG_CPU |
| 303 | /* State of each CPU during hotplug phases */ |
| 304 | DEFINE_PER_CPU(int, cpu_state) = { 0 }; |
| 305 | |
| 306 | int generic_cpu_disable(void) |
| 307 | { |
| 308 | unsigned int cpu = smp_processor_id(); |
| 309 | |
| 310 | if (cpu == boot_cpuid) |
| 311 | return -EBUSY; |
| 312 | |
| 313 | set_cpu_online(cpu, false); |
| 314 | #ifdef CONFIG_PPC64 |
| 315 | vdso_data->processorCount--; |
| 316 | fixup_irqs(cpu_online_mask); |
| 317 | #endif |
| 318 | return 0; |
| 319 | } |
| 320 | |
| 321 | int generic_cpu_enable(unsigned int cpu) |
| 322 | { |
| 323 | /* Do the normal bootup if we haven't |
| 324 | * already bootstrapped. */ |
| 325 | if (system_state != SYSTEM_RUNNING) |
| 326 | return -ENOSYS; |
| 327 | |
| 328 | /* get the target out of it's holding state */ |
| 329 | per_cpu(cpu_state, cpu) = CPU_UP_PREPARE; |
| 330 | smp_wmb(); |
| 331 | |
| 332 | while (!cpu_online(cpu)) |
| 333 | cpu_relax(); |
| 334 | |
| 335 | #ifdef CONFIG_PPC64 |
| 336 | fixup_irqs(cpu_online_mask); |
| 337 | /* counter the irq disable in fixup_irqs */ |
| 338 | local_irq_enable(); |
| 339 | #endif |
| 340 | return 0; |
| 341 | } |
| 342 | |
| 343 | void generic_cpu_die(unsigned int cpu) |
| 344 | { |
| 345 | int i; |
| 346 | |
| 347 | for (i = 0; i < 100; i++) { |
| 348 | smp_rmb(); |
| 349 | if (per_cpu(cpu_state, cpu) == CPU_DEAD) |
| 350 | return; |
| 351 | msleep(100); |
| 352 | } |
| 353 | printk(KERN_ERR "CPU%d didn't die...\n", cpu); |
| 354 | } |
| 355 | |
| 356 | void generic_mach_cpu_die(void) |
| 357 | { |
| 358 | unsigned int cpu; |
| 359 | |
| 360 | local_irq_disable(); |
| 361 | cpu = smp_processor_id(); |
| 362 | printk(KERN_DEBUG "CPU%d offline\n", cpu); |
| 363 | __get_cpu_var(cpu_state) = CPU_DEAD; |
| 364 | smp_wmb(); |
| 365 | while (__get_cpu_var(cpu_state) != CPU_UP_PREPARE) |
| 366 | cpu_relax(); |
| 367 | set_cpu_online(cpu, true); |
| 368 | local_irq_enable(); |
| 369 | } |
| 370 | #endif |
| 371 | |
| 372 | static int __devinit cpu_enable(unsigned int cpu) |
| 373 | { |
| 374 | if (smp_ops && smp_ops->cpu_enable) |
| 375 | return smp_ops->cpu_enable(cpu); |
| 376 | |
| 377 | return -ENOSYS; |
| 378 | } |
| 379 | |
| 380 | int __cpuinit __cpu_up(unsigned int cpu) |
| 381 | { |
| 382 | int c; |
| 383 | |
| 384 | secondary_ti = current_set[cpu]; |
| 385 | if (!cpu_enable(cpu)) |
| 386 | return 0; |
| 387 | |
| 388 | if (smp_ops == NULL || |
| 389 | (smp_ops->cpu_bootable && !smp_ops->cpu_bootable(cpu))) |
| 390 | return -EINVAL; |
| 391 | |
| 392 | /* Make sure callin-map entry is 0 (can be leftover a CPU |
| 393 | * hotplug |
| 394 | */ |
| 395 | cpu_callin_map[cpu] = 0; |
| 396 | |
| 397 | /* The information for processor bringup must |
| 398 | * be written out to main store before we release |
| 399 | * the processor. |
| 400 | */ |
| 401 | smp_mb(); |
| 402 | |
| 403 | /* wake up cpus */ |
| 404 | DBG("smp: kicking cpu %d\n", cpu); |
| 405 | smp_ops->kick_cpu(cpu); |
| 406 | |
| 407 | /* |
| 408 | * wait to see if the cpu made a callin (is actually up). |
| 409 | * use this value that I found through experimentation. |
| 410 | * -- Cort |
| 411 | */ |
| 412 | if (system_state < SYSTEM_RUNNING) |
| 413 | for (c = 50000; c && !cpu_callin_map[cpu]; c--) |
| 414 | udelay(100); |
| 415 | #ifdef CONFIG_HOTPLUG_CPU |
| 416 | else |
| 417 | /* |
| 418 | * CPUs can take much longer to come up in the |
| 419 | * hotplug case. Wait five seconds. |
| 420 | */ |
| 421 | for (c = 5000; c && !cpu_callin_map[cpu]; c--) |
| 422 | msleep(1); |
| 423 | #endif |
| 424 | |
| 425 | if (!cpu_callin_map[cpu]) { |
| 426 | printk("Processor %u is stuck.\n", cpu); |
| 427 | return -ENOENT; |
| 428 | } |
| 429 | |
| 430 | printk("Processor %u found.\n", cpu); |
| 431 | |
| 432 | if (smp_ops->give_timebase) |
| 433 | smp_ops->give_timebase(); |
| 434 | |
| 435 | /* Wait until cpu puts itself in the online map */ |
| 436 | while (!cpu_online(cpu)) |
| 437 | cpu_relax(); |
| 438 | |
| 439 | return 0; |
| 440 | } |
| 441 | |
| 442 | /* Return the value of the reg property corresponding to the given |
| 443 | * logical cpu. |
| 444 | */ |
| 445 | int cpu_to_core_id(int cpu) |
| 446 | { |
| 447 | struct device_node *np; |
| 448 | const int *reg; |
| 449 | int id = -1; |
| 450 | |
| 451 | np = of_get_cpu_node(cpu, NULL); |
| 452 | if (!np) |
| 453 | goto out; |
| 454 | |
| 455 | reg = of_get_property(np, "reg", NULL); |
| 456 | if (!reg) |
| 457 | goto out; |
| 458 | |
| 459 | id = *reg; |
| 460 | out: |
| 461 | of_node_put(np); |
| 462 | return id; |
| 463 | } |
| 464 | |
| 465 | /* Must be called when no change can occur to cpu_present_map, |
| 466 | * i.e. during cpu online or offline. |
| 467 | */ |
| 468 | static struct device_node *cpu_to_l2cache(int cpu) |
| 469 | { |
| 470 | struct device_node *np; |
| 471 | struct device_node *cache; |
| 472 | |
| 473 | if (!cpu_present(cpu)) |
| 474 | return NULL; |
| 475 | |
| 476 | np = of_get_cpu_node(cpu, NULL); |
| 477 | if (np == NULL) |
| 478 | return NULL; |
| 479 | |
| 480 | cache = of_find_next_cache_node(np); |
| 481 | |
| 482 | of_node_put(np); |
| 483 | |
| 484 | return cache; |
| 485 | } |
| 486 | |
| 487 | /* Activate a secondary processor. */ |
| 488 | int __devinit start_secondary(void *unused) |
| 489 | { |
| 490 | unsigned int cpu = smp_processor_id(); |
| 491 | struct device_node *l2_cache; |
| 492 | int i, base; |
| 493 | |
| 494 | atomic_inc(&init_mm.mm_count); |
| 495 | current->active_mm = &init_mm; |
| 496 | |
| 497 | smp_store_cpu_info(cpu); |
| 498 | |
| 499 | #if defined(CONFIG_BOOKE) || defined(CONFIG_40x) |
| 500 | /* Clear any pending timer interrupts */ |
| 501 | mtspr(SPRN_TSR, TSR_ENW | TSR_WIS | TSR_DIS | TSR_FIS); |
| 502 | |
| 503 | /* Enable decrementer interrupt */ |
| 504 | mtspr(SPRN_TCR, TCR_DIE); |
| 505 | #endif |
| 506 | set_dec(tb_ticks_per_jiffy); |
| 507 | preempt_disable(); |
| 508 | cpu_callin_map[cpu] = 1; |
| 509 | |
| 510 | if (smp_ops->setup_cpu) |
| 511 | smp_ops->setup_cpu(cpu); |
| 512 | if (smp_ops->take_timebase) |
| 513 | smp_ops->take_timebase(); |
| 514 | |
| 515 | if (system_state > SYSTEM_BOOTING) |
| 516 | snapshot_timebase(); |
| 517 | |
| 518 | secondary_cpu_time_init(); |
| 519 | |
| 520 | ipi_call_lock(); |
| 521 | notify_cpu_starting(cpu); |
| 522 | set_cpu_online(cpu, true); |
| 523 | /* Update sibling maps */ |
| 524 | base = cpu_first_thread_in_core(cpu); |
| 525 | for (i = 0; i < threads_per_core; i++) { |
| 526 | if (cpu_is_offline(base + i)) |
| 527 | continue; |
| 528 | cpu_set(cpu, per_cpu(cpu_sibling_map, base + i)); |
| 529 | cpu_set(base + i, per_cpu(cpu_sibling_map, cpu)); |
| 530 | |
| 531 | /* cpu_core_map should be a superset of |
| 532 | * cpu_sibling_map even if we don't have cache |
| 533 | * information, so update the former here, too. |
| 534 | */ |
| 535 | cpu_set(cpu, per_cpu(cpu_core_map, base +i)); |
| 536 | cpu_set(base + i, per_cpu(cpu_core_map, cpu)); |
| 537 | } |
| 538 | l2_cache = cpu_to_l2cache(cpu); |
| 539 | for_each_online_cpu(i) { |
| 540 | struct device_node *np = cpu_to_l2cache(i); |
| 541 | if (!np) |
| 542 | continue; |
| 543 | if (np == l2_cache) { |
| 544 | cpu_set(cpu, per_cpu(cpu_core_map, i)); |
| 545 | cpu_set(i, per_cpu(cpu_core_map, cpu)); |
| 546 | } |
| 547 | of_node_put(np); |
| 548 | } |
| 549 | of_node_put(l2_cache); |
| 550 | ipi_call_unlock(); |
| 551 | |
| 552 | local_irq_enable(); |
| 553 | |
| 554 | cpu_idle(); |
| 555 | return 0; |
| 556 | } |
| 557 | |
| 558 | int setup_profiling_timer(unsigned int multiplier) |
| 559 | { |
| 560 | return 0; |
| 561 | } |
| 562 | |
| 563 | void __init smp_cpus_done(unsigned int max_cpus) |
| 564 | { |
| 565 | cpumask_var_t old_mask; |
| 566 | |
| 567 | /* We want the setup_cpu() here to be called from CPU 0, but our |
| 568 | * init thread may have been "borrowed" by another CPU in the meantime |
| 569 | * se we pin us down to CPU 0 for a short while |
| 570 | */ |
| 571 | alloc_cpumask_var(&old_mask, GFP_NOWAIT); |
| 572 | cpumask_copy(old_mask, ¤t->cpus_allowed); |
| 573 | set_cpus_allowed_ptr(current, cpumask_of(boot_cpuid)); |
| 574 | |
| 575 | if (smp_ops && smp_ops->setup_cpu) |
| 576 | smp_ops->setup_cpu(boot_cpuid); |
| 577 | |
| 578 | set_cpus_allowed_ptr(current, old_mask); |
| 579 | |
| 580 | free_cpumask_var(old_mask); |
| 581 | |
| 582 | snapshot_timebases(); |
| 583 | |
| 584 | dump_numa_cpu_topology(); |
| 585 | } |
| 586 | |
| 587 | #ifdef CONFIG_HOTPLUG_CPU |
| 588 | int __cpu_disable(void) |
| 589 | { |
| 590 | struct device_node *l2_cache; |
| 591 | int cpu = smp_processor_id(); |
| 592 | int base, i; |
| 593 | int err; |
| 594 | |
| 595 | if (!smp_ops->cpu_disable) |
| 596 | return -ENOSYS; |
| 597 | |
| 598 | err = smp_ops->cpu_disable(); |
| 599 | if (err) |
| 600 | return err; |
| 601 | |
| 602 | /* Update sibling maps */ |
| 603 | base = cpu_first_thread_in_core(cpu); |
| 604 | for (i = 0; i < threads_per_core; i++) { |
| 605 | cpu_clear(cpu, per_cpu(cpu_sibling_map, base + i)); |
| 606 | cpu_clear(base + i, per_cpu(cpu_sibling_map, cpu)); |
| 607 | cpu_clear(cpu, per_cpu(cpu_core_map, base +i)); |
| 608 | cpu_clear(base + i, per_cpu(cpu_core_map, cpu)); |
| 609 | } |
| 610 | |
| 611 | l2_cache = cpu_to_l2cache(cpu); |
| 612 | for_each_present_cpu(i) { |
| 613 | struct device_node *np = cpu_to_l2cache(i); |
| 614 | if (!np) |
| 615 | continue; |
| 616 | if (np == l2_cache) { |
| 617 | cpu_clear(cpu, per_cpu(cpu_core_map, i)); |
| 618 | cpu_clear(i, per_cpu(cpu_core_map, cpu)); |
| 619 | } |
| 620 | of_node_put(np); |
| 621 | } |
| 622 | of_node_put(l2_cache); |
| 623 | |
| 624 | |
| 625 | return 0; |
| 626 | } |
| 627 | |
| 628 | void __cpu_die(unsigned int cpu) |
| 629 | { |
| 630 | if (smp_ops->cpu_die) |
| 631 | smp_ops->cpu_die(cpu); |
| 632 | } |
| 633 | |
| 634 | static DEFINE_MUTEX(powerpc_cpu_hotplug_driver_mutex); |
| 635 | |
| 636 | void cpu_hotplug_driver_lock() |
| 637 | { |
| 638 | mutex_lock(&powerpc_cpu_hotplug_driver_mutex); |
| 639 | } |
| 640 | |
| 641 | void cpu_hotplug_driver_unlock() |
| 642 | { |
| 643 | mutex_unlock(&powerpc_cpu_hotplug_driver_mutex); |
| 644 | } |
| 645 | #endif |