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/hw_irq.h> 39#include <asm/kvm_ppc.h> 40#include <asm/page.h> 41#include <asm/pgtable.h> 42#include <asm/prom.h> 43#include <asm/smp.h> 44#include <asm/time.h> 45#include <asm/machdep.h> 46#include <asm/cputhreads.h> 47#include <asm/cputable.h> 48#include <asm/mpic.h> 49#include <asm/vdso_datapage.h> 50#ifdef CONFIG_PPC64 51#include <asm/paca.h> 52#endif 53#include <asm/vdso.h> 54#include <asm/debug.h> 55#include <asm/kexec.h> 56 57#ifdef DEBUG 58#include <asm/udbg.h> 59#define DBG(fmt...) udbg_printf(fmt) 60#else 61#define DBG(fmt...) 62#endif 63 64#ifdef CONFIG_HOTPLUG_CPU 65/* State of each CPU during hotplug phases */ 66static DEFINE_PER_CPU(int, cpu_state) = { 0 }; 67#endif 68 69struct thread_info *secondary_ti; 70 71DEFINE_PER_CPU(cpumask_var_t, cpu_sibling_map); 72DEFINE_PER_CPU(cpumask_var_t, cpu_core_map); 73 74EXPORT_PER_CPU_SYMBOL(cpu_sibling_map); 75EXPORT_PER_CPU_SYMBOL(cpu_core_map); 76 77/* SMP operations for this machine */ 78struct smp_ops_t *smp_ops; 79 80/* Can't be static due to PowerMac hackery */ 81volatile unsigned int cpu_callin_map[NR_CPUS]; 82 83int smt_enabled_at_boot = 1; 84 85static void (*crash_ipi_function_ptr)(struct pt_regs *) = NULL; 86 87/* 88 * Returns 1 if the specified cpu should be brought up during boot. 89 * Used to inhibit booting threads if they've been disabled or 90 * limited on the command line 91 */ 92int smp_generic_cpu_bootable(unsigned int nr) 93{ 94 /* Special case - we inhibit secondary thread startup 95 * during boot if the user requests it. 96 */ 97 if (system_state == SYSTEM_BOOTING && cpu_has_feature(CPU_FTR_SMT)) { 98 if (!smt_enabled_at_boot && cpu_thread_in_core(nr) != 0) 99 return 0; 100 if (smt_enabled_at_boot 101 && cpu_thread_in_core(nr) >= smt_enabled_at_boot) 102 return 0; 103 } 104 105 return 1; 106} 107 108 109#ifdef CONFIG_PPC64 110int smp_generic_kick_cpu(int nr) 111{ 112 BUG_ON(nr < 0 || nr >= NR_CPUS); 113 114 /* 115 * The processor is currently spinning, waiting for the 116 * cpu_start field to become non-zero After we set cpu_start, 117 * the processor will continue on to secondary_start 118 */ 119 if (!paca[nr].cpu_start) { 120 paca[nr].cpu_start = 1; 121 smp_mb(); 122 return 0; 123 } 124 125#ifdef CONFIG_HOTPLUG_CPU 126 /* 127 * Ok it's not there, so it might be soft-unplugged, let's 128 * try to bring it back 129 */ 130 generic_set_cpu_up(nr); 131 smp_wmb(); 132 smp_send_reschedule(nr); 133#endif /* CONFIG_HOTPLUG_CPU */ 134 135 return 0; 136} 137#endif /* CONFIG_PPC64 */ 138 139static irqreturn_t call_function_action(int irq, void *data) 140{ 141 generic_smp_call_function_interrupt(); 142 return IRQ_HANDLED; 143} 144 145static irqreturn_t reschedule_action(int irq, void *data) 146{ 147 scheduler_ipi(); 148 return IRQ_HANDLED; 149} 150 151static irqreturn_t tick_broadcast_ipi_action(int irq, void *data) 152{ 153 tick_broadcast_ipi_handler(); 154 return IRQ_HANDLED; 155} 156 157static irqreturn_t debug_ipi_action(int irq, void *data) 158{ 159 if (crash_ipi_function_ptr) { 160 crash_ipi_function_ptr(get_irq_regs()); 161 return IRQ_HANDLED; 162 } 163 164#ifdef CONFIG_DEBUGGER 165 debugger_ipi(get_irq_regs()); 166#endif /* CONFIG_DEBUGGER */ 167 168 return IRQ_HANDLED; 169} 170 171static irq_handler_t smp_ipi_action[] = { 172 [PPC_MSG_CALL_FUNCTION] = call_function_action, 173 [PPC_MSG_RESCHEDULE] = reschedule_action, 174 [PPC_MSG_TICK_BROADCAST] = tick_broadcast_ipi_action, 175 [PPC_MSG_DEBUGGER_BREAK] = debug_ipi_action, 176}; 177 178const char *smp_ipi_name[] = { 179 [PPC_MSG_CALL_FUNCTION] = "ipi call function", 180 [PPC_MSG_RESCHEDULE] = "ipi reschedule", 181 [PPC_MSG_TICK_BROADCAST] = "ipi tick-broadcast", 182 [PPC_MSG_DEBUGGER_BREAK] = "ipi debugger", 183}; 184 185/* optional function to request ipi, for controllers with >= 4 ipis */ 186int smp_request_message_ipi(int virq, int msg) 187{ 188 int err; 189 190 if (msg < 0 || msg > PPC_MSG_DEBUGGER_BREAK) { 191 return -EINVAL; 192 } 193#if !defined(CONFIG_DEBUGGER) && !defined(CONFIG_KEXEC) 194 if (msg == PPC_MSG_DEBUGGER_BREAK) { 195 return 1; 196 } 197#endif 198 err = request_irq(virq, smp_ipi_action[msg], 199 IRQF_PERCPU | IRQF_NO_THREAD | IRQF_NO_SUSPEND, 200 smp_ipi_name[msg], NULL); 201 WARN(err < 0, "unable to request_irq %d for %s (rc %d)\n", 202 virq, smp_ipi_name[msg], err); 203 204 return err; 205} 206 207#ifdef CONFIG_PPC_SMP_MUXED_IPI 208struct cpu_messages { 209 int messages; /* current messages */ 210 unsigned long data; /* data for cause ipi */ 211}; 212static DEFINE_PER_CPU_SHARED_ALIGNED(struct cpu_messages, ipi_message); 213 214void smp_muxed_ipi_set_data(int cpu, unsigned long data) 215{ 216 struct cpu_messages *info = &per_cpu(ipi_message, cpu); 217 218 info->data = data; 219} 220 221void smp_muxed_ipi_message_pass(int cpu, int msg) 222{ 223 struct cpu_messages *info = &per_cpu(ipi_message, cpu); 224 char *message = (char *)&info->messages; 225 226 /* 227 * Order previous accesses before accesses in the IPI handler. 228 */ 229 smp_mb(); 230 message[msg] = 1; 231 /* 232 * cause_ipi functions are required to include a full barrier 233 * before doing whatever causes the IPI. 234 */ 235 smp_ops->cause_ipi(cpu, info->data); 236} 237 238#ifdef __BIG_ENDIAN__ 239#define IPI_MESSAGE(A) (1 << (24 - 8 * (A))) 240#else 241#define IPI_MESSAGE(A) (1 << (8 * (A))) 242#endif 243 244irqreturn_t smp_ipi_demux(void) 245{ 246 struct cpu_messages *info = this_cpu_ptr(&ipi_message); 247 unsigned int all; 248 249 mb(); /* order any irq clear */ 250 251 do { 252 all = xchg(&info->messages, 0); 253 if (all & IPI_MESSAGE(PPC_MSG_CALL_FUNCTION)) 254 generic_smp_call_function_interrupt(); 255 if (all & IPI_MESSAGE(PPC_MSG_RESCHEDULE)) 256 scheduler_ipi(); 257 if (all & IPI_MESSAGE(PPC_MSG_TICK_BROADCAST)) 258 tick_broadcast_ipi_handler(); 259 if (all & IPI_MESSAGE(PPC_MSG_DEBUGGER_BREAK)) 260 debug_ipi_action(0, NULL); 261 } while (info->messages); 262 263 return IRQ_HANDLED; 264} 265#endif /* CONFIG_PPC_SMP_MUXED_IPI */ 266 267static inline void do_message_pass(int cpu, int msg) 268{ 269 if (smp_ops->message_pass) 270 smp_ops->message_pass(cpu, msg); 271#ifdef CONFIG_PPC_SMP_MUXED_IPI 272 else 273 smp_muxed_ipi_message_pass(cpu, msg); 274#endif 275} 276 277void smp_send_reschedule(int cpu) 278{ 279 if (likely(smp_ops)) 280 do_message_pass(cpu, PPC_MSG_RESCHEDULE); 281} 282EXPORT_SYMBOL_GPL(smp_send_reschedule); 283 284void arch_send_call_function_single_ipi(int cpu) 285{ 286 do_message_pass(cpu, PPC_MSG_CALL_FUNCTION); 287} 288 289void arch_send_call_function_ipi_mask(const struct cpumask *mask) 290{ 291 unsigned int cpu; 292 293 for_each_cpu(cpu, mask) 294 do_message_pass(cpu, PPC_MSG_CALL_FUNCTION); 295} 296 297#ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST 298void tick_broadcast(const struct cpumask *mask) 299{ 300 unsigned int cpu; 301 302 for_each_cpu(cpu, mask) 303 do_message_pass(cpu, PPC_MSG_TICK_BROADCAST); 304} 305#endif 306 307#if defined(CONFIG_DEBUGGER) || defined(CONFIG_KEXEC) 308void smp_send_debugger_break(void) 309{ 310 int cpu; 311 int me = raw_smp_processor_id(); 312 313 if (unlikely(!smp_ops)) 314 return; 315 316 for_each_online_cpu(cpu) 317 if (cpu != me) 318 do_message_pass(cpu, PPC_MSG_DEBUGGER_BREAK); 319} 320#endif 321 322#ifdef CONFIG_KEXEC 323void crash_send_ipi(void (*crash_ipi_callback)(struct pt_regs *)) 324{ 325 crash_ipi_function_ptr = crash_ipi_callback; 326 if (crash_ipi_callback) { 327 mb(); 328 smp_send_debugger_break(); 329 } 330} 331#endif 332 333static void stop_this_cpu(void *dummy) 334{ 335 /* Remove this CPU */ 336 set_cpu_online(smp_processor_id(), false); 337 338 local_irq_disable(); 339 while (1) 340 ; 341} 342 343void smp_send_stop(void) 344{ 345 smp_call_function(stop_this_cpu, NULL, 0); 346} 347 348struct thread_info *current_set[NR_CPUS]; 349 350static void smp_store_cpu_info(int id) 351{ 352 per_cpu(cpu_pvr, id) = mfspr(SPRN_PVR); 353#ifdef CONFIG_PPC_FSL_BOOK3E 354 per_cpu(next_tlbcam_idx, id) 355 = (mfspr(SPRN_TLB1CFG) & TLBnCFG_N_ENTRY) - 1; 356#endif 357} 358 359void __init smp_prepare_cpus(unsigned int max_cpus) 360{ 361 unsigned int cpu; 362 363 DBG("smp_prepare_cpus\n"); 364 365 /* 366 * setup_cpu may need to be called on the boot cpu. We havent 367 * spun any cpus up but lets be paranoid. 368 */ 369 BUG_ON(boot_cpuid != smp_processor_id()); 370 371 /* Fixup boot cpu */ 372 smp_store_cpu_info(boot_cpuid); 373 cpu_callin_map[boot_cpuid] = 1; 374 375 for_each_possible_cpu(cpu) { 376 zalloc_cpumask_var_node(&per_cpu(cpu_sibling_map, cpu), 377 GFP_KERNEL, cpu_to_node(cpu)); 378 zalloc_cpumask_var_node(&per_cpu(cpu_core_map, cpu), 379 GFP_KERNEL, cpu_to_node(cpu)); 380 /* 381 * numa_node_id() works after this. 382 */ 383 if (cpu_present(cpu)) { 384 set_cpu_numa_node(cpu, numa_cpu_lookup_table[cpu]); 385 set_cpu_numa_mem(cpu, 386 local_memory_node(numa_cpu_lookup_table[cpu])); 387 } 388 } 389 390 cpumask_set_cpu(boot_cpuid, cpu_sibling_mask(boot_cpuid)); 391 cpumask_set_cpu(boot_cpuid, cpu_core_mask(boot_cpuid)); 392 393 if (smp_ops && smp_ops->probe) 394 smp_ops->probe(); 395} 396 397void smp_prepare_boot_cpu(void) 398{ 399 BUG_ON(smp_processor_id() != boot_cpuid); 400#ifdef CONFIG_PPC64 401 paca[boot_cpuid].__current = current; 402#endif 403 set_numa_node(numa_cpu_lookup_table[boot_cpuid]); 404 current_set[boot_cpuid] = task_thread_info(current); 405} 406 407#ifdef CONFIG_HOTPLUG_CPU 408 409int generic_cpu_disable(void) 410{ 411 unsigned int cpu = smp_processor_id(); 412 413 if (cpu == boot_cpuid) 414 return -EBUSY; 415 416 set_cpu_online(cpu, false); 417#ifdef CONFIG_PPC64 418 vdso_data->processorCount--; 419#endif 420 migrate_irqs(); 421 return 0; 422} 423 424void generic_cpu_die(unsigned int cpu) 425{ 426 int i; 427 428 for (i = 0; i < 100; i++) { 429 smp_rmb(); 430 if (per_cpu(cpu_state, cpu) == CPU_DEAD) 431 return; 432 msleep(100); 433 } 434 printk(KERN_ERR "CPU%d didn't die...\n", cpu); 435} 436 437void generic_set_cpu_dead(unsigned int cpu) 438{ 439 per_cpu(cpu_state, cpu) = CPU_DEAD; 440} 441 442/* 443 * The cpu_state should be set to CPU_UP_PREPARE in kick_cpu(), otherwise 444 * the cpu_state is always CPU_DEAD after calling generic_set_cpu_dead(), 445 * which makes the delay in generic_cpu_die() not happen. 446 */ 447void generic_set_cpu_up(unsigned int cpu) 448{ 449 per_cpu(cpu_state, cpu) = CPU_UP_PREPARE; 450} 451 452int generic_check_cpu_restart(unsigned int cpu) 453{ 454 return per_cpu(cpu_state, cpu) == CPU_UP_PREPARE; 455} 456 457static bool secondaries_inhibited(void) 458{ 459 return kvm_hv_mode_active(); 460} 461 462#else /* HOTPLUG_CPU */ 463 464#define secondaries_inhibited() 0 465 466#endif 467 468static void cpu_idle_thread_init(unsigned int cpu, struct task_struct *idle) 469{ 470 struct thread_info *ti = task_thread_info(idle); 471 472#ifdef CONFIG_PPC64 473 paca[cpu].__current = idle; 474 paca[cpu].kstack = (unsigned long)ti + THREAD_SIZE - STACK_FRAME_OVERHEAD; 475#endif 476 ti->cpu = cpu; 477 secondary_ti = current_set[cpu] = ti; 478} 479 480int __cpu_up(unsigned int cpu, struct task_struct *tidle) 481{ 482 int rc, c; 483 484 /* 485 * Don't allow secondary threads to come online if inhibited 486 */ 487 if (threads_per_core > 1 && secondaries_inhibited() && 488 cpu_thread_in_subcore(cpu)) 489 return -EBUSY; 490 491 if (smp_ops == NULL || 492 (smp_ops->cpu_bootable && !smp_ops->cpu_bootable(cpu))) 493 return -EINVAL; 494 495 cpu_idle_thread_init(cpu, tidle); 496 497 /* Make sure callin-map entry is 0 (can be leftover a CPU 498 * hotplug 499 */ 500 cpu_callin_map[cpu] = 0; 501 502 /* The information for processor bringup must 503 * be written out to main store before we release 504 * the processor. 505 */ 506 smp_mb(); 507 508 /* wake up cpus */ 509 DBG("smp: kicking cpu %d\n", cpu); 510 rc = smp_ops->kick_cpu(cpu); 511 if (rc) { 512 pr_err("smp: failed starting cpu %d (rc %d)\n", cpu, rc); 513 return rc; 514 } 515 516 /* 517 * wait to see if the cpu made a callin (is actually up). 518 * use this value that I found through experimentation. 519 * -- Cort 520 */ 521 if (system_state < SYSTEM_RUNNING) 522 for (c = 50000; c && !cpu_callin_map[cpu]; c--) 523 udelay(100); 524#ifdef CONFIG_HOTPLUG_CPU 525 else 526 /* 527 * CPUs can take much longer to come up in the 528 * hotplug case. Wait five seconds. 529 */ 530 for (c = 5000; c && !cpu_callin_map[cpu]; c--) 531 msleep(1); 532#endif 533 534 if (!cpu_callin_map[cpu]) { 535 printk(KERN_ERR "Processor %u is stuck.\n", cpu); 536 return -ENOENT; 537 } 538 539 DBG("Processor %u found.\n", cpu); 540 541 if (smp_ops->give_timebase) 542 smp_ops->give_timebase(); 543 544 /* Wait until cpu puts itself in the online & active maps */ 545 while (!cpu_online(cpu) || !cpu_active(cpu)) 546 cpu_relax(); 547 548 return 0; 549} 550 551/* Return the value of the reg property corresponding to the given 552 * logical cpu. 553 */ 554int cpu_to_core_id(int cpu) 555{ 556 struct device_node *np; 557 const __be32 *reg; 558 int id = -1; 559 560 np = of_get_cpu_node(cpu, NULL); 561 if (!np) 562 goto out; 563 564 reg = of_get_property(np, "reg", NULL); 565 if (!reg) 566 goto out; 567 568 id = be32_to_cpup(reg); 569out: 570 of_node_put(np); 571 return id; 572} 573 574/* Helper routines for cpu to core mapping */ 575int cpu_core_index_of_thread(int cpu) 576{ 577 return cpu >> threads_shift; 578} 579EXPORT_SYMBOL_GPL(cpu_core_index_of_thread); 580 581int cpu_first_thread_of_core(int core) 582{ 583 return core << threads_shift; 584} 585EXPORT_SYMBOL_GPL(cpu_first_thread_of_core); 586 587static void traverse_siblings_chip_id(int cpu, bool add, int chipid) 588{ 589 const struct cpumask *mask; 590 struct device_node *np; 591 int i, plen; 592 const __be32 *prop; 593 594 mask = add ? cpu_online_mask : cpu_present_mask; 595 for_each_cpu(i, mask) { 596 np = of_get_cpu_node(i, NULL); 597 if (!np) 598 continue; 599 prop = of_get_property(np, "ibm,chip-id", &plen); 600 if (prop && plen == sizeof(int) && 601 of_read_number(prop, 1) == chipid) { 602 if (add) { 603 cpumask_set_cpu(cpu, cpu_core_mask(i)); 604 cpumask_set_cpu(i, cpu_core_mask(cpu)); 605 } else { 606 cpumask_clear_cpu(cpu, cpu_core_mask(i)); 607 cpumask_clear_cpu(i, cpu_core_mask(cpu)); 608 } 609 } 610 of_node_put(np); 611 } 612} 613 614/* Must be called when no change can occur to cpu_present_mask, 615 * i.e. during cpu online or offline. 616 */ 617static struct device_node *cpu_to_l2cache(int cpu) 618{ 619 struct device_node *np; 620 struct device_node *cache; 621 622 if (!cpu_present(cpu)) 623 return NULL; 624 625 np = of_get_cpu_node(cpu, NULL); 626 if (np == NULL) 627 return NULL; 628 629 cache = of_find_next_cache_node(np); 630 631 of_node_put(np); 632 633 return cache; 634} 635 636static void traverse_core_siblings(int cpu, bool add) 637{ 638 struct device_node *l2_cache, *np; 639 const struct cpumask *mask; 640 int i, chip, plen; 641 const __be32 *prop; 642 643 /* First see if we have ibm,chip-id properties in cpu nodes */ 644 np = of_get_cpu_node(cpu, NULL); 645 if (np) { 646 chip = -1; 647 prop = of_get_property(np, "ibm,chip-id", &plen); 648 if (prop && plen == sizeof(int)) 649 chip = of_read_number(prop, 1); 650 of_node_put(np); 651 if (chip >= 0) { 652 traverse_siblings_chip_id(cpu, add, chip); 653 return; 654 } 655 } 656 657 l2_cache = cpu_to_l2cache(cpu); 658 mask = add ? cpu_online_mask : cpu_present_mask; 659 for_each_cpu(i, mask) { 660 np = cpu_to_l2cache(i); 661 if (!np) 662 continue; 663 if (np == l2_cache) { 664 if (add) { 665 cpumask_set_cpu(cpu, cpu_core_mask(i)); 666 cpumask_set_cpu(i, cpu_core_mask(cpu)); 667 } else { 668 cpumask_clear_cpu(cpu, cpu_core_mask(i)); 669 cpumask_clear_cpu(i, cpu_core_mask(cpu)); 670 } 671 } 672 of_node_put(np); 673 } 674 of_node_put(l2_cache); 675} 676 677/* Activate a secondary processor. */ 678void start_secondary(void *unused) 679{ 680 unsigned int cpu = smp_processor_id(); 681 int i, base; 682 683 atomic_inc(&init_mm.mm_count); 684 current->active_mm = &init_mm; 685 686 smp_store_cpu_info(cpu); 687 set_dec(tb_ticks_per_jiffy); 688 preempt_disable(); 689 cpu_callin_map[cpu] = 1; 690 691 if (smp_ops->setup_cpu) 692 smp_ops->setup_cpu(cpu); 693 if (smp_ops->take_timebase) 694 smp_ops->take_timebase(); 695 696 secondary_cpu_time_init(); 697 698#ifdef CONFIG_PPC64 699 if (system_state == SYSTEM_RUNNING) 700 vdso_data->processorCount++; 701 702 vdso_getcpu_init(); 703#endif 704 /* Update sibling maps */ 705 base = cpu_first_thread_sibling(cpu); 706 for (i = 0; i < threads_per_core; i++) { 707 if (cpu_is_offline(base + i) && (cpu != base + i)) 708 continue; 709 cpumask_set_cpu(cpu, cpu_sibling_mask(base + i)); 710 cpumask_set_cpu(base + i, cpu_sibling_mask(cpu)); 711 712 /* cpu_core_map should be a superset of 713 * cpu_sibling_map even if we don't have cache 714 * information, so update the former here, too. 715 */ 716 cpumask_set_cpu(cpu, cpu_core_mask(base + i)); 717 cpumask_set_cpu(base + i, cpu_core_mask(cpu)); 718 } 719 traverse_core_siblings(cpu, true); 720 721 set_numa_node(numa_cpu_lookup_table[cpu]); 722 set_numa_mem(local_memory_node(numa_cpu_lookup_table[cpu])); 723 724 smp_wmb(); 725 notify_cpu_starting(cpu); 726 set_cpu_online(cpu, true); 727 728 local_irq_enable(); 729 730 cpu_startup_entry(CPUHP_ONLINE); 731 732 BUG(); 733} 734 735int setup_profiling_timer(unsigned int multiplier) 736{ 737 return 0; 738} 739 740#ifdef CONFIG_SCHED_SMT 741/* cpumask of CPUs with asymetric SMT dependancy */ 742static int powerpc_smt_flags(void) 743{ 744 int flags = SD_SHARE_CPUCAPACITY | SD_SHARE_PKG_RESOURCES; 745 746 if (cpu_has_feature(CPU_FTR_ASYM_SMT)) { 747 printk_once(KERN_INFO "Enabling Asymmetric SMT scheduling\n"); 748 flags |= SD_ASYM_PACKING; 749 } 750 return flags; 751} 752#endif 753 754static struct sched_domain_topology_level powerpc_topology[] = { 755#ifdef CONFIG_SCHED_SMT 756 { cpu_smt_mask, powerpc_smt_flags, SD_INIT_NAME(SMT) }, 757#endif 758 { cpu_cpu_mask, SD_INIT_NAME(DIE) }, 759 { NULL, }, 760}; 761 762void __init smp_cpus_done(unsigned int max_cpus) 763{ 764 cpumask_var_t old_mask; 765 766 /* We want the setup_cpu() here to be called from CPU 0, but our 767 * init thread may have been "borrowed" by another CPU in the meantime 768 * se we pin us down to CPU 0 for a short while 769 */ 770 alloc_cpumask_var(&old_mask, GFP_NOWAIT); 771 cpumask_copy(old_mask, tsk_cpus_allowed(current)); 772 set_cpus_allowed_ptr(current, cpumask_of(boot_cpuid)); 773 774 if (smp_ops && smp_ops->setup_cpu) 775 smp_ops->setup_cpu(boot_cpuid); 776 777 set_cpus_allowed_ptr(current, old_mask); 778 779 free_cpumask_var(old_mask); 780 781 if (smp_ops && smp_ops->bringup_done) 782 smp_ops->bringup_done(); 783 784 dump_numa_cpu_topology(); 785 786 set_sched_topology(powerpc_topology); 787 788} 789 790#ifdef CONFIG_HOTPLUG_CPU 791int __cpu_disable(void) 792{ 793 int cpu = smp_processor_id(); 794 int base, i; 795 int err; 796 797 if (!smp_ops->cpu_disable) 798 return -ENOSYS; 799 800 err = smp_ops->cpu_disable(); 801 if (err) 802 return err; 803 804 /* Update sibling maps */ 805 base = cpu_first_thread_sibling(cpu); 806 for (i = 0; i < threads_per_core; i++) { 807 cpumask_clear_cpu(cpu, cpu_sibling_mask(base + i)); 808 cpumask_clear_cpu(base + i, cpu_sibling_mask(cpu)); 809 cpumask_clear_cpu(cpu, cpu_core_mask(base + i)); 810 cpumask_clear_cpu(base + i, cpu_core_mask(cpu)); 811 } 812 traverse_core_siblings(cpu, false); 813 814 return 0; 815} 816 817void __cpu_die(unsigned int cpu) 818{ 819 if (smp_ops->cpu_die) 820 smp_ops->cpu_die(cpu); 821} 822 823void cpu_die(void) 824{ 825 if (ppc_md.cpu_die) 826 ppc_md.cpu_die(); 827 828 /* If we return, we re-enter start_secondary */ 829 start_secondary_resume(); 830} 831 832#endif 833