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/export.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/device.h> 31 #include <linux/cpu.h> 32 #include <linux/notifier.h> 33 #include <linux/topology.h> 34 35 #include <asm/ptrace.h> 36 #include <linux/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/mpic.h> 47 #include <asm/vdso_datapage.h> 48 #ifdef CONFIG_PPC64 49 #include <asm/paca.h> 50 #endif 51 #include <asm/vdso.h> 52 #include <asm/debug.h> 53 54 #ifdef DEBUG 55 #include <asm/udbg.h> 56 #define DBG(fmt...) udbg_printf(fmt) 57 #else 58 #define DBG(fmt...) 59 #endif 60 61 #ifdef CONFIG_HOTPLUG_CPU 62 /* State of each CPU during hotplug phases */ 63 static DEFINE_PER_CPU(int, cpu_state) = { 0 }; 64 #endif 65 66 struct thread_info *secondary_ti; 67 68 DEFINE_PER_CPU(cpumask_var_t, cpu_sibling_map); 69 DEFINE_PER_CPU(cpumask_var_t, cpu_core_map); 70 71 EXPORT_PER_CPU_SYMBOL(cpu_sibling_map); 72 EXPORT_PER_CPU_SYMBOL(cpu_core_map); 73 74 /* SMP operations for this machine */ 75 struct smp_ops_t *smp_ops; 76 77 /* Can't be static due to PowerMac hackery */ 78 volatile unsigned int cpu_callin_map[NR_CPUS]; 79 80 int smt_enabled_at_boot = 1; 81 82 static void (*crash_ipi_function_ptr)(struct pt_regs *) = NULL; 83 84 #ifdef CONFIG_PPC64 85 int smp_generic_kick_cpu(int nr) 86 { 87 BUG_ON(nr < 0 || nr >= NR_CPUS); 88 89 /* 90 * The processor is currently spinning, waiting for the 91 * cpu_start field to become non-zero After we set cpu_start, 92 * the processor will continue on to secondary_start 93 */ 94 if (!paca[nr].cpu_start) { 95 paca[nr].cpu_start = 1; 96 smp_mb(); 97 return 0; 98 } 99 100 #ifdef CONFIG_HOTPLUG_CPU 101 /* 102 * Ok it's not there, so it might be soft-unplugged, let's 103 * try to bring it back 104 */ 105 generic_set_cpu_up(nr); 106 smp_wmb(); 107 smp_send_reschedule(nr); 108 #endif /* CONFIG_HOTPLUG_CPU */ 109 110 return 0; 111 } 112 #endif /* CONFIG_PPC64 */ 113 114 static irqreturn_t call_function_action(int irq, void *data) 115 { 116 generic_smp_call_function_interrupt(); 117 return IRQ_HANDLED; 118 } 119 120 static irqreturn_t reschedule_action(int irq, void *data) 121 { 122 scheduler_ipi(); 123 return IRQ_HANDLED; 124 } 125 126 static irqreturn_t call_function_single_action(int irq, void *data) 127 { 128 generic_smp_call_function_single_interrupt(); 129 return IRQ_HANDLED; 130 } 131 132 static irqreturn_t debug_ipi_action(int irq, void *data) 133 { 134 if (crash_ipi_function_ptr) { 135 crash_ipi_function_ptr(get_irq_regs()); 136 return IRQ_HANDLED; 137 } 138 139 #ifdef CONFIG_DEBUGGER 140 debugger_ipi(get_irq_regs()); 141 #endif /* CONFIG_DEBUGGER */ 142 143 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], 174 IRQF_PERCPU | IRQF_NO_THREAD | IRQF_NO_SUSPEND, 175 smp_ipi_name[msg], 0); 176 WARN(err < 0, "unable to request_irq %d for %s (rc %d)\n", 177 virq, smp_ipi_name[msg], err); 178 179 return err; 180 } 181 182 #ifdef CONFIG_PPC_SMP_MUXED_IPI 183 struct cpu_messages { 184 int messages; /* current messages */ 185 unsigned long data; /* data for cause ipi */ 186 }; 187 static DEFINE_PER_CPU_SHARED_ALIGNED(struct cpu_messages, ipi_message); 188 189 void smp_muxed_ipi_set_data(int cpu, unsigned long data) 190 { 191 struct cpu_messages *info = &per_cpu(ipi_message, cpu); 192 193 info->data = data; 194 } 195 196 void smp_muxed_ipi_message_pass(int cpu, int msg) 197 { 198 struct cpu_messages *info = &per_cpu(ipi_message, cpu); 199 char *message = (char *)&info->messages; 200 201 /* 202 * Order previous accesses before accesses in the IPI handler. 203 */ 204 smp_mb(); 205 message[msg] = 1; 206 /* 207 * cause_ipi functions are required to include a full barrier 208 * before doing whatever causes the IPI. 209 */ 210 smp_ops->cause_ipi(cpu, info->data); 211 } 212 213 irqreturn_t smp_ipi_demux(void) 214 { 215 struct cpu_messages *info = &__get_cpu_var(ipi_message); 216 unsigned int all; 217 218 mb(); /* order any irq clear */ 219 220 do { 221 all = xchg(&info->messages, 0); 222 223 #ifdef __BIG_ENDIAN 224 if (all & (1 << (24 - 8 * PPC_MSG_CALL_FUNCTION))) 225 generic_smp_call_function_interrupt(); 226 if (all & (1 << (24 - 8 * PPC_MSG_RESCHEDULE))) 227 scheduler_ipi(); 228 if (all & (1 << (24 - 8 * PPC_MSG_CALL_FUNC_SINGLE))) 229 generic_smp_call_function_single_interrupt(); 230 if (all & (1 << (24 - 8 * PPC_MSG_DEBUGGER_BREAK))) 231 debug_ipi_action(0, NULL); 232 #else 233 #error Unsupported ENDIAN 234 #endif 235 } while (info->messages); 236 237 return IRQ_HANDLED; 238 } 239 #endif /* CONFIG_PPC_SMP_MUXED_IPI */ 240 241 static inline void do_message_pass(int cpu, int msg) 242 { 243 if (smp_ops->message_pass) 244 smp_ops->message_pass(cpu, msg); 245 #ifdef CONFIG_PPC_SMP_MUXED_IPI 246 else 247 smp_muxed_ipi_message_pass(cpu, msg); 248 #endif 249 } 250 251 void smp_send_reschedule(int cpu) 252 { 253 if (likely(smp_ops)) 254 do_message_pass(cpu, PPC_MSG_RESCHEDULE); 255 } 256 EXPORT_SYMBOL_GPL(smp_send_reschedule); 257 258 void arch_send_call_function_single_ipi(int cpu) 259 { 260 do_message_pass(cpu, PPC_MSG_CALL_FUNC_SINGLE); 261 } 262 263 void arch_send_call_function_ipi_mask(const struct cpumask *mask) 264 { 265 unsigned int cpu; 266 267 for_each_cpu(cpu, mask) 268 do_message_pass(cpu, PPC_MSG_CALL_FUNCTION); 269 } 270 271 #if defined(CONFIG_DEBUGGER) || defined(CONFIG_KEXEC) 272 void smp_send_debugger_break(void) 273 { 274 int cpu; 275 int me = raw_smp_processor_id(); 276 277 if (unlikely(!smp_ops)) 278 return; 279 280 for_each_online_cpu(cpu) 281 if (cpu != me) 282 do_message_pass(cpu, PPC_MSG_DEBUGGER_BREAK); 283 } 284 #endif 285 286 #ifdef CONFIG_KEXEC 287 void crash_send_ipi(void (*crash_ipi_callback)(struct pt_regs *)) 288 { 289 crash_ipi_function_ptr = crash_ipi_callback; 290 if (crash_ipi_callback) { 291 mb(); 292 smp_send_debugger_break(); 293 } 294 } 295 #endif 296 297 static void stop_this_cpu(void *dummy) 298 { 299 /* Remove this CPU */ 300 set_cpu_online(smp_processor_id(), false); 301 302 local_irq_disable(); 303 while (1) 304 ; 305 } 306 307 void smp_send_stop(void) 308 { 309 smp_call_function(stop_this_cpu, NULL, 0); 310 } 311 312 struct thread_info *current_set[NR_CPUS]; 313 314 static void smp_store_cpu_info(int id) 315 { 316 per_cpu(cpu_pvr, id) = mfspr(SPRN_PVR); 317 #ifdef CONFIG_PPC_FSL_BOOK3E 318 per_cpu(next_tlbcam_idx, id) 319 = (mfspr(SPRN_TLB1CFG) & TLBnCFG_N_ENTRY) - 1; 320 #endif 321 } 322 323 void __init smp_prepare_cpus(unsigned int max_cpus) 324 { 325 unsigned int cpu; 326 327 DBG("smp_prepare_cpus\n"); 328 329 /* 330 * setup_cpu may need to be called on the boot cpu. We havent 331 * spun any cpus up but lets be paranoid. 332 */ 333 BUG_ON(boot_cpuid != smp_processor_id()); 334 335 /* Fixup boot cpu */ 336 smp_store_cpu_info(boot_cpuid); 337 cpu_callin_map[boot_cpuid] = 1; 338 339 for_each_possible_cpu(cpu) { 340 zalloc_cpumask_var_node(&per_cpu(cpu_sibling_map, cpu), 341 GFP_KERNEL, cpu_to_node(cpu)); 342 zalloc_cpumask_var_node(&per_cpu(cpu_core_map, cpu), 343 GFP_KERNEL, cpu_to_node(cpu)); 344 } 345 346 cpumask_set_cpu(boot_cpuid, cpu_sibling_mask(boot_cpuid)); 347 cpumask_set_cpu(boot_cpuid, cpu_core_mask(boot_cpuid)); 348 349 if (smp_ops) 350 if (smp_ops->probe) 351 max_cpus = smp_ops->probe(); 352 else 353 max_cpus = NR_CPUS; 354 else 355 max_cpus = 1; 356 } 357 358 void smp_prepare_boot_cpu(void) 359 { 360 BUG_ON(smp_processor_id() != boot_cpuid); 361 #ifdef CONFIG_PPC64 362 paca[boot_cpuid].__current = current; 363 #endif 364 current_set[boot_cpuid] = task_thread_info(current); 365 } 366 367 #ifdef CONFIG_HOTPLUG_CPU 368 369 int generic_cpu_disable(void) 370 { 371 unsigned int cpu = smp_processor_id(); 372 373 if (cpu == boot_cpuid) 374 return -EBUSY; 375 376 set_cpu_online(cpu, false); 377 #ifdef CONFIG_PPC64 378 vdso_data->processorCount--; 379 #endif 380 migrate_irqs(); 381 return 0; 382 } 383 384 void generic_cpu_die(unsigned int cpu) 385 { 386 int i; 387 388 for (i = 0; i < 100; i++) { 389 smp_rmb(); 390 if (per_cpu(cpu_state, cpu) == CPU_DEAD) 391 return; 392 msleep(100); 393 } 394 printk(KERN_ERR "CPU%d didn't die...\n", cpu); 395 } 396 397 void generic_mach_cpu_die(void) 398 { 399 unsigned int cpu; 400 401 local_irq_disable(); 402 idle_task_exit(); 403 cpu = smp_processor_id(); 404 printk(KERN_DEBUG "CPU%d offline\n", cpu); 405 __get_cpu_var(cpu_state) = CPU_DEAD; 406 smp_wmb(); 407 while (__get_cpu_var(cpu_state) != CPU_UP_PREPARE) 408 cpu_relax(); 409 } 410 411 void generic_set_cpu_dead(unsigned int cpu) 412 { 413 per_cpu(cpu_state, cpu) = CPU_DEAD; 414 } 415 416 /* 417 * The cpu_state should be set to CPU_UP_PREPARE in kick_cpu(), otherwise 418 * the cpu_state is always CPU_DEAD after calling generic_set_cpu_dead(), 419 * which makes the delay in generic_cpu_die() not happen. 420 */ 421 void generic_set_cpu_up(unsigned int cpu) 422 { 423 per_cpu(cpu_state, cpu) = CPU_UP_PREPARE; 424 } 425 426 int generic_check_cpu_restart(unsigned int cpu) 427 { 428 return per_cpu(cpu_state, cpu) == CPU_UP_PREPARE; 429 } 430 431 static atomic_t secondary_inhibit_count; 432 433 /* 434 * Don't allow secondary CPU threads to come online 435 */ 436 void inhibit_secondary_onlining(void) 437 { 438 /* 439 * This makes secondary_inhibit_count stable during cpu 440 * online/offline operations. 441 */ 442 get_online_cpus(); 443 444 atomic_inc(&secondary_inhibit_count); 445 put_online_cpus(); 446 } 447 EXPORT_SYMBOL_GPL(inhibit_secondary_onlining); 448 449 /* 450 * Allow secondary CPU threads to come online again 451 */ 452 void uninhibit_secondary_onlining(void) 453 { 454 get_online_cpus(); 455 atomic_dec(&secondary_inhibit_count); 456 put_online_cpus(); 457 } 458 EXPORT_SYMBOL_GPL(uninhibit_secondary_onlining); 459 460 static int secondaries_inhibited(void) 461 { 462 return atomic_read(&secondary_inhibit_count); 463 } 464 465 #else /* HOTPLUG_CPU */ 466 467 #define secondaries_inhibited() 0 468 469 #endif 470 471 static void cpu_idle_thread_init(unsigned int cpu, struct task_struct *idle) 472 { 473 struct thread_info *ti = task_thread_info(idle); 474 475 #ifdef CONFIG_PPC64 476 paca[cpu].__current = idle; 477 paca[cpu].kstack = (unsigned long)ti + THREAD_SIZE - STACK_FRAME_OVERHEAD; 478 #endif 479 ti->cpu = cpu; 480 secondary_ti = current_set[cpu] = ti; 481 } 482 483 int __cpu_up(unsigned int cpu, struct task_struct *tidle) 484 { 485 int rc, c; 486 487 /* 488 * Don't allow secondary threads to come online if inhibited 489 */ 490 if (threads_per_core > 1 && secondaries_inhibited() && 491 cpu % threads_per_core != 0) 492 return -EBUSY; 493 494 if (smp_ops == NULL || 495 (smp_ops->cpu_bootable && !smp_ops->cpu_bootable(cpu))) 496 return -EINVAL; 497 498 cpu_idle_thread_init(cpu, tidle); 499 500 /* Make sure callin-map entry is 0 (can be leftover a CPU 501 * hotplug 502 */ 503 cpu_callin_map[cpu] = 0; 504 505 /* The information for processor bringup must 506 * be written out to main store before we release 507 * the processor. 508 */ 509 smp_mb(); 510 511 /* wake up cpus */ 512 DBG("smp: kicking cpu %d\n", cpu); 513 rc = smp_ops->kick_cpu(cpu); 514 if (rc) { 515 pr_err("smp: failed starting cpu %d (rc %d)\n", cpu, rc); 516 return rc; 517 } 518 519 /* 520 * wait to see if the cpu made a callin (is actually up). 521 * use this value that I found through experimentation. 522 * -- Cort 523 */ 524 if (system_state < SYSTEM_RUNNING) 525 for (c = 50000; c && !cpu_callin_map[cpu]; c--) 526 udelay(100); 527 #ifdef CONFIG_HOTPLUG_CPU 528 else 529 /* 530 * CPUs can take much longer to come up in the 531 * hotplug case. Wait five seconds. 532 */ 533 for (c = 5000; c && !cpu_callin_map[cpu]; c--) 534 msleep(1); 535 #endif 536 537 if (!cpu_callin_map[cpu]) { 538 printk(KERN_ERR "Processor %u is stuck.\n", cpu); 539 return -ENOENT; 540 } 541 542 DBG("Processor %u found.\n", cpu); 543 544 if (smp_ops->give_timebase) 545 smp_ops->give_timebase(); 546 547 /* Wait until cpu puts itself in the online map */ 548 while (!cpu_online(cpu)) 549 cpu_relax(); 550 551 return 0; 552 } 553 554 /* Return the value of the reg property corresponding to the given 555 * logical cpu. 556 */ 557 int cpu_to_core_id(int cpu) 558 { 559 struct device_node *np; 560 const int *reg; 561 int id = -1; 562 563 np = of_get_cpu_node(cpu, NULL); 564 if (!np) 565 goto out; 566 567 reg = of_get_property(np, "reg", NULL); 568 if (!reg) 569 goto out; 570 571 id = *reg; 572 out: 573 of_node_put(np); 574 return id; 575 } 576 577 /* Helper routines for cpu to core mapping */ 578 int cpu_core_index_of_thread(int cpu) 579 { 580 return cpu >> threads_shift; 581 } 582 EXPORT_SYMBOL_GPL(cpu_core_index_of_thread); 583 584 int cpu_first_thread_of_core(int core) 585 { 586 return core << threads_shift; 587 } 588 EXPORT_SYMBOL_GPL(cpu_first_thread_of_core); 589 590 /* Must be called when no change can occur to cpu_present_mask, 591 * i.e. during cpu online or offline. 592 */ 593 static struct device_node *cpu_to_l2cache(int cpu) 594 { 595 struct device_node *np; 596 struct device_node *cache; 597 598 if (!cpu_present(cpu)) 599 return NULL; 600 601 np = of_get_cpu_node(cpu, NULL); 602 if (np == NULL) 603 return NULL; 604 605 cache = of_find_next_cache_node(np); 606 607 of_node_put(np); 608 609 return cache; 610 } 611 612 /* Activate a secondary processor. */ 613 void start_secondary(void *unused) 614 { 615 unsigned int cpu = smp_processor_id(); 616 struct device_node *l2_cache; 617 int i, base; 618 619 atomic_inc(&init_mm.mm_count); 620 current->active_mm = &init_mm; 621 622 smp_store_cpu_info(cpu); 623 set_dec(tb_ticks_per_jiffy); 624 preempt_disable(); 625 cpu_callin_map[cpu] = 1; 626 627 if (smp_ops->setup_cpu) 628 smp_ops->setup_cpu(cpu); 629 if (smp_ops->take_timebase) 630 smp_ops->take_timebase(); 631 632 secondary_cpu_time_init(); 633 634 #ifdef CONFIG_PPC64 635 if (system_state == SYSTEM_RUNNING) 636 vdso_data->processorCount++; 637 638 vdso_getcpu_init(); 639 #endif 640 /* Update sibling maps */ 641 base = cpu_first_thread_sibling(cpu); 642 for (i = 0; i < threads_per_core; i++) { 643 if (cpu_is_offline(base + i) && (cpu != base + i)) 644 continue; 645 cpumask_set_cpu(cpu, cpu_sibling_mask(base + i)); 646 cpumask_set_cpu(base + i, cpu_sibling_mask(cpu)); 647 648 /* cpu_core_map should be a superset of 649 * cpu_sibling_map even if we don't have cache 650 * information, so update the former here, too. 651 */ 652 cpumask_set_cpu(cpu, cpu_core_mask(base + i)); 653 cpumask_set_cpu(base + i, cpu_core_mask(cpu)); 654 } 655 l2_cache = cpu_to_l2cache(cpu); 656 for_each_online_cpu(i) { 657 struct device_node *np = cpu_to_l2cache(i); 658 if (!np) 659 continue; 660 if (np == l2_cache) { 661 cpumask_set_cpu(cpu, cpu_core_mask(i)); 662 cpumask_set_cpu(i, cpu_core_mask(cpu)); 663 } 664 of_node_put(np); 665 } 666 of_node_put(l2_cache); 667 668 smp_wmb(); 669 notify_cpu_starting(cpu); 670 set_cpu_online(cpu, true); 671 672 local_irq_enable(); 673 674 cpu_startup_entry(CPUHP_ONLINE); 675 676 BUG(); 677 } 678 679 int setup_profiling_timer(unsigned int multiplier) 680 { 681 return 0; 682 } 683 684 void __init smp_cpus_done(unsigned int max_cpus) 685 { 686 cpumask_var_t old_mask; 687 688 /* We want the setup_cpu() here to be called from CPU 0, but our 689 * init thread may have been "borrowed" by another CPU in the meantime 690 * se we pin us down to CPU 0 for a short while 691 */ 692 alloc_cpumask_var(&old_mask, GFP_NOWAIT); 693 cpumask_copy(old_mask, tsk_cpus_allowed(current)); 694 set_cpus_allowed_ptr(current, cpumask_of(boot_cpuid)); 695 696 if (smp_ops && smp_ops->setup_cpu) 697 smp_ops->setup_cpu(boot_cpuid); 698 699 set_cpus_allowed_ptr(current, old_mask); 700 701 free_cpumask_var(old_mask); 702 703 if (smp_ops && smp_ops->bringup_done) 704 smp_ops->bringup_done(); 705 706 dump_numa_cpu_topology(); 707 708 } 709 710 int arch_sd_sibling_asym_packing(void) 711 { 712 if (cpu_has_feature(CPU_FTR_ASYM_SMT)) { 713 printk_once(KERN_INFO "Enabling Asymmetric SMT scheduling\n"); 714 return SD_ASYM_PACKING; 715 } 716 return 0; 717 } 718 719 #ifdef CONFIG_HOTPLUG_CPU 720 int __cpu_disable(void) 721 { 722 struct device_node *l2_cache; 723 int cpu = smp_processor_id(); 724 int base, i; 725 int err; 726 727 if (!smp_ops->cpu_disable) 728 return -ENOSYS; 729 730 err = smp_ops->cpu_disable(); 731 if (err) 732 return err; 733 734 /* Update sibling maps */ 735 base = cpu_first_thread_sibling(cpu); 736 for (i = 0; i < threads_per_core; i++) { 737 cpumask_clear_cpu(cpu, cpu_sibling_mask(base + i)); 738 cpumask_clear_cpu(base + i, cpu_sibling_mask(cpu)); 739 cpumask_clear_cpu(cpu, cpu_core_mask(base + i)); 740 cpumask_clear_cpu(base + i, cpu_core_mask(cpu)); 741 } 742 743 l2_cache = cpu_to_l2cache(cpu); 744 for_each_present_cpu(i) { 745 struct device_node *np = cpu_to_l2cache(i); 746 if (!np) 747 continue; 748 if (np == l2_cache) { 749 cpumask_clear_cpu(cpu, cpu_core_mask(i)); 750 cpumask_clear_cpu(i, cpu_core_mask(cpu)); 751 } 752 of_node_put(np); 753 } 754 of_node_put(l2_cache); 755 756 757 return 0; 758 } 759 760 void __cpu_die(unsigned int cpu) 761 { 762 if (smp_ops->cpu_die) 763 smp_ops->cpu_die(cpu); 764 } 765 766 static DEFINE_MUTEX(powerpc_cpu_hotplug_driver_mutex); 767 768 void cpu_hotplug_driver_lock() 769 { 770 mutex_lock(&powerpc_cpu_hotplug_driver_mutex); 771 } 772 773 void cpu_hotplug_driver_unlock() 774 { 775 mutex_unlock(&powerpc_cpu_hotplug_driver_mutex); 776 } 777 778 void cpu_die(void) 779 { 780 if (ppc_md.cpu_die) 781 ppc_md.cpu_die(); 782 783 /* If we return, we re-enter start_secondary */ 784 start_secondary_resume(); 785 } 786 787 #endif 788