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Linux/arch/powerpc/kernel/smp.c

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  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 */
 66 static DEFINE_PER_CPU(int, cpu_state) = { 0 };
 67 #endif
 68 
 69 struct thread_info *secondary_ti;
 70 
 71 DEFINE_PER_CPU(cpumask_var_t, cpu_sibling_map);
 72 DEFINE_PER_CPU(cpumask_var_t, cpu_core_map);
 73 
 74 EXPORT_PER_CPU_SYMBOL(cpu_sibling_map);
 75 EXPORT_PER_CPU_SYMBOL(cpu_core_map);
 76 
 77 /* SMP operations for this machine */
 78 struct smp_ops_t *smp_ops;
 79 
 80 /* Can't be static due to PowerMac hackery */
 81 volatile unsigned int cpu_callin_map[NR_CPUS];
 82 
 83 int smt_enabled_at_boot = 1;
 84 
 85 static 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  */
 92 int 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
110 int 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 
139 static irqreturn_t call_function_action(int irq, void *data)
140 {
141         generic_smp_call_function_interrupt();
142         return IRQ_HANDLED;
143 }
144 
145 static irqreturn_t reschedule_action(int irq, void *data)
146 {
147         scheduler_ipi();
148         return IRQ_HANDLED;
149 }
150 
151 static irqreturn_t tick_broadcast_ipi_action(int irq, void *data)
152 {
153         tick_broadcast_ipi_handler();
154         return IRQ_HANDLED;
155 }
156 
157 static 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 
171 static 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 
178 const 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 */
186 int 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
208 struct cpu_messages {
209         long messages;                  /* current messages */
210         unsigned long data;             /* data for cause ipi */
211 };
212 static DEFINE_PER_CPU_SHARED_ALIGNED(struct cpu_messages, ipi_message);
213 
214 void 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 
221 void smp_muxed_ipi_set_message(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 
233 void smp_muxed_ipi_message_pass(int cpu, int msg)
234 {
235         struct cpu_messages *info = &per_cpu(ipi_message, cpu);
236 
237         smp_muxed_ipi_set_message(cpu, msg);
238         /*
239          * cause_ipi functions are required to include a full barrier
240          * before doing whatever causes the IPI.
241          */
242         smp_ops->cause_ipi(cpu, info->data);
243 }
244 
245 #ifdef __BIG_ENDIAN__
246 #define IPI_MESSAGE(A) (1uL << ((BITS_PER_LONG - 8) - 8 * (A)))
247 #else
248 #define IPI_MESSAGE(A) (1uL << (8 * (A)))
249 #endif
250 
251 irqreturn_t smp_ipi_demux(void)
252 {
253         struct cpu_messages *info = this_cpu_ptr(&ipi_message);
254         unsigned long all;
255 
256         mb();   /* order any irq clear */
257 
258         do {
259                 all = xchg(&info->messages, 0);
260 #if defined(CONFIG_KVM_XICS) && defined(CONFIG_KVM_BOOK3S_HV_POSSIBLE)
261                 /*
262                  * Must check for PPC_MSG_RM_HOST_ACTION messages
263                  * before PPC_MSG_CALL_FUNCTION messages because when
264                  * a VM is destroyed, we call kick_all_cpus_sync()
265                  * to ensure that any pending PPC_MSG_RM_HOST_ACTION
266                  * messages have completed before we free any VCPUs.
267                  */
268                 if (all & IPI_MESSAGE(PPC_MSG_RM_HOST_ACTION))
269                         kvmppc_xics_ipi_action();
270 #endif
271                 if (all & IPI_MESSAGE(PPC_MSG_CALL_FUNCTION))
272                         generic_smp_call_function_interrupt();
273                 if (all & IPI_MESSAGE(PPC_MSG_RESCHEDULE))
274                         scheduler_ipi();
275                 if (all & IPI_MESSAGE(PPC_MSG_TICK_BROADCAST))
276                         tick_broadcast_ipi_handler();
277                 if (all & IPI_MESSAGE(PPC_MSG_DEBUGGER_BREAK))
278                         debug_ipi_action(0, NULL);
279         } while (info->messages);
280 
281         return IRQ_HANDLED;
282 }
283 #endif /* CONFIG_PPC_SMP_MUXED_IPI */
284 
285 static inline void do_message_pass(int cpu, int msg)
286 {
287         if (smp_ops->message_pass)
288                 smp_ops->message_pass(cpu, msg);
289 #ifdef CONFIG_PPC_SMP_MUXED_IPI
290         else
291                 smp_muxed_ipi_message_pass(cpu, msg);
292 #endif
293 }
294 
295 void smp_send_reschedule(int cpu)
296 {
297         if (likely(smp_ops))
298                 do_message_pass(cpu, PPC_MSG_RESCHEDULE);
299 }
300 EXPORT_SYMBOL_GPL(smp_send_reschedule);
301 
302 void arch_send_call_function_single_ipi(int cpu)
303 {
304         do_message_pass(cpu, PPC_MSG_CALL_FUNCTION);
305 }
306 
307 void arch_send_call_function_ipi_mask(const struct cpumask *mask)
308 {
309         unsigned int cpu;
310 
311         for_each_cpu(cpu, mask)
312                 do_message_pass(cpu, PPC_MSG_CALL_FUNCTION);
313 }
314 
315 #ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
316 void tick_broadcast(const struct cpumask *mask)
317 {
318         unsigned int cpu;
319 
320         for_each_cpu(cpu, mask)
321                 do_message_pass(cpu, PPC_MSG_TICK_BROADCAST);
322 }
323 #endif
324 
325 #if defined(CONFIG_DEBUGGER) || defined(CONFIG_KEXEC)
326 void smp_send_debugger_break(void)
327 {
328         int cpu;
329         int me = raw_smp_processor_id();
330 
331         if (unlikely(!smp_ops))
332                 return;
333 
334         for_each_online_cpu(cpu)
335                 if (cpu != me)
336                         do_message_pass(cpu, PPC_MSG_DEBUGGER_BREAK);
337 }
338 #endif
339 
340 #ifdef CONFIG_KEXEC
341 void crash_send_ipi(void (*crash_ipi_callback)(struct pt_regs *))
342 {
343         crash_ipi_function_ptr = crash_ipi_callback;
344         if (crash_ipi_callback) {
345                 mb();
346                 smp_send_debugger_break();
347         }
348 }
349 #endif
350 
351 static void stop_this_cpu(void *dummy)
352 {
353         /* Remove this CPU */
354         set_cpu_online(smp_processor_id(), false);
355 
356         local_irq_disable();
357         while (1)
358                 ;
359 }
360 
361 void smp_send_stop(void)
362 {
363         smp_call_function(stop_this_cpu, NULL, 0);
364 }
365 
366 struct thread_info *current_set[NR_CPUS];
367 
368 static void smp_store_cpu_info(int id)
369 {
370         per_cpu(cpu_pvr, id) = mfspr(SPRN_PVR);
371 #ifdef CONFIG_PPC_FSL_BOOK3E
372         per_cpu(next_tlbcam_idx, id)
373                 = (mfspr(SPRN_TLB1CFG) & TLBnCFG_N_ENTRY) - 1;
374 #endif
375 }
376 
377 void __init smp_prepare_cpus(unsigned int max_cpus)
378 {
379         unsigned int cpu;
380 
381         DBG("smp_prepare_cpus\n");
382 
383         /* 
384          * setup_cpu may need to be called on the boot cpu. We havent
385          * spun any cpus up but lets be paranoid.
386          */
387         BUG_ON(boot_cpuid != smp_processor_id());
388 
389         /* Fixup boot cpu */
390         smp_store_cpu_info(boot_cpuid);
391         cpu_callin_map[boot_cpuid] = 1;
392 
393         for_each_possible_cpu(cpu) {
394                 zalloc_cpumask_var_node(&per_cpu(cpu_sibling_map, cpu),
395                                         GFP_KERNEL, cpu_to_node(cpu));
396                 zalloc_cpumask_var_node(&per_cpu(cpu_core_map, cpu),
397                                         GFP_KERNEL, cpu_to_node(cpu));
398                 /*
399                  * numa_node_id() works after this.
400                  */
401                 if (cpu_present(cpu)) {
402                         set_cpu_numa_node(cpu, numa_cpu_lookup_table[cpu]);
403                         set_cpu_numa_mem(cpu,
404                                 local_memory_node(numa_cpu_lookup_table[cpu]));
405                 }
406         }
407 
408         cpumask_set_cpu(boot_cpuid, cpu_sibling_mask(boot_cpuid));
409         cpumask_set_cpu(boot_cpuid, cpu_core_mask(boot_cpuid));
410 
411         if (smp_ops && smp_ops->probe)
412                 smp_ops->probe();
413 }
414 
415 void smp_prepare_boot_cpu(void)
416 {
417         BUG_ON(smp_processor_id() != boot_cpuid);
418 #ifdef CONFIG_PPC64
419         paca[boot_cpuid].__current = current;
420 #endif
421         set_numa_node(numa_cpu_lookup_table[boot_cpuid]);
422         current_set[boot_cpuid] = task_thread_info(current);
423 }
424 
425 #ifdef CONFIG_HOTPLUG_CPU
426 
427 int generic_cpu_disable(void)
428 {
429         unsigned int cpu = smp_processor_id();
430 
431         if (cpu == boot_cpuid)
432                 return -EBUSY;
433 
434         set_cpu_online(cpu, false);
435 #ifdef CONFIG_PPC64
436         vdso_data->processorCount--;
437 #endif
438         migrate_irqs();
439         return 0;
440 }
441 
442 void generic_cpu_die(unsigned int cpu)
443 {
444         int i;
445 
446         for (i = 0; i < 100; i++) {
447                 smp_rmb();
448                 if (is_cpu_dead(cpu))
449                         return;
450                 msleep(100);
451         }
452         printk(KERN_ERR "CPU%d didn't die...\n", cpu);
453 }
454 
455 void generic_set_cpu_dead(unsigned int cpu)
456 {
457         per_cpu(cpu_state, cpu) = CPU_DEAD;
458 }
459 
460 /*
461  * The cpu_state should be set to CPU_UP_PREPARE in kick_cpu(), otherwise
462  * the cpu_state is always CPU_DEAD after calling generic_set_cpu_dead(),
463  * which makes the delay in generic_cpu_die() not happen.
464  */
465 void generic_set_cpu_up(unsigned int cpu)
466 {
467         per_cpu(cpu_state, cpu) = CPU_UP_PREPARE;
468 }
469 
470 int generic_check_cpu_restart(unsigned int cpu)
471 {
472         return per_cpu(cpu_state, cpu) == CPU_UP_PREPARE;
473 }
474 
475 int is_cpu_dead(unsigned int cpu)
476 {
477         return per_cpu(cpu_state, cpu) == CPU_DEAD;
478 }
479 
480 static bool secondaries_inhibited(void)
481 {
482         return kvm_hv_mode_active();
483 }
484 
485 #else /* HOTPLUG_CPU */
486 
487 #define secondaries_inhibited()         0
488 
489 #endif
490 
491 static void cpu_idle_thread_init(unsigned int cpu, struct task_struct *idle)
492 {
493         struct thread_info *ti = task_thread_info(idle);
494 
495 #ifdef CONFIG_PPC64
496         paca[cpu].__current = idle;
497         paca[cpu].kstack = (unsigned long)ti + THREAD_SIZE - STACK_FRAME_OVERHEAD;
498 #endif
499         ti->cpu = cpu;
500         secondary_ti = current_set[cpu] = ti;
501 }
502 
503 int __cpu_up(unsigned int cpu, struct task_struct *tidle)
504 {
505         int rc, c;
506 
507         /*
508          * Don't allow secondary threads to come online if inhibited
509          */
510         if (threads_per_core > 1 && secondaries_inhibited() &&
511             cpu_thread_in_subcore(cpu))
512                 return -EBUSY;
513 
514         if (smp_ops == NULL ||
515             (smp_ops->cpu_bootable && !smp_ops->cpu_bootable(cpu)))
516                 return -EINVAL;
517 
518         cpu_idle_thread_init(cpu, tidle);
519 
520         /* Make sure callin-map entry is 0 (can be leftover a CPU
521          * hotplug
522          */
523         cpu_callin_map[cpu] = 0;
524 
525         /* The information for processor bringup must
526          * be written out to main store before we release
527          * the processor.
528          */
529         smp_mb();
530 
531         /* wake up cpus */
532         DBG("smp: kicking cpu %d\n", cpu);
533         rc = smp_ops->kick_cpu(cpu);
534         if (rc) {
535                 pr_err("smp: failed starting cpu %d (rc %d)\n", cpu, rc);
536                 return rc;
537         }
538 
539         /*
540          * wait to see if the cpu made a callin (is actually up).
541          * use this value that I found through experimentation.
542          * -- Cort
543          */
544         if (system_state < SYSTEM_RUNNING)
545                 for (c = 50000; c && !cpu_callin_map[cpu]; c--)
546                         udelay(100);
547 #ifdef CONFIG_HOTPLUG_CPU
548         else
549                 /*
550                  * CPUs can take much longer to come up in the
551                  * hotplug case.  Wait five seconds.
552                  */
553                 for (c = 5000; c && !cpu_callin_map[cpu]; c--)
554                         msleep(1);
555 #endif
556 
557         if (!cpu_callin_map[cpu]) {
558                 printk(KERN_ERR "Processor %u is stuck.\n", cpu);
559                 return -ENOENT;
560         }
561 
562         DBG("Processor %u found.\n", cpu);
563 
564         if (smp_ops->give_timebase)
565                 smp_ops->give_timebase();
566 
567         /* Wait until cpu puts itself in the online & active maps */
568         while (!cpu_online(cpu))
569                 cpu_relax();
570 
571         return 0;
572 }
573 
574 /* Return the value of the reg property corresponding to the given
575  * logical cpu.
576  */
577 int cpu_to_core_id(int cpu)
578 {
579         struct device_node *np;
580         const __be32 *reg;
581         int id = -1;
582 
583         np = of_get_cpu_node(cpu, NULL);
584         if (!np)
585                 goto out;
586 
587         reg = of_get_property(np, "reg", NULL);
588         if (!reg)
589                 goto out;
590 
591         id = be32_to_cpup(reg);
592 out:
593         of_node_put(np);
594         return id;
595 }
596 
597 /* Helper routines for cpu to core mapping */
598 int cpu_core_index_of_thread(int cpu)
599 {
600         return cpu >> threads_shift;
601 }
602 EXPORT_SYMBOL_GPL(cpu_core_index_of_thread);
603 
604 int cpu_first_thread_of_core(int core)
605 {
606         return core << threads_shift;
607 }
608 EXPORT_SYMBOL_GPL(cpu_first_thread_of_core);
609 
610 static void traverse_siblings_chip_id(int cpu, bool add, int chipid)
611 {
612         const struct cpumask *mask;
613         struct device_node *np;
614         int i, plen;
615         const __be32 *prop;
616 
617         mask = add ? cpu_online_mask : cpu_present_mask;
618         for_each_cpu(i, mask) {
619                 np = of_get_cpu_node(i, NULL);
620                 if (!np)
621                         continue;
622                 prop = of_get_property(np, "ibm,chip-id", &plen);
623                 if (prop && plen == sizeof(int) &&
624                     of_read_number(prop, 1) == chipid) {
625                         if (add) {
626                                 cpumask_set_cpu(cpu, cpu_core_mask(i));
627                                 cpumask_set_cpu(i, cpu_core_mask(cpu));
628                         } else {
629                                 cpumask_clear_cpu(cpu, cpu_core_mask(i));
630                                 cpumask_clear_cpu(i, cpu_core_mask(cpu));
631                         }
632                 }
633                 of_node_put(np);
634         }
635 }
636 
637 /* Must be called when no change can occur to cpu_present_mask,
638  * i.e. during cpu online or offline.
639  */
640 static struct device_node *cpu_to_l2cache(int cpu)
641 {
642         struct device_node *np;
643         struct device_node *cache;
644 
645         if (!cpu_present(cpu))
646                 return NULL;
647 
648         np = of_get_cpu_node(cpu, NULL);
649         if (np == NULL)
650                 return NULL;
651 
652         cache = of_find_next_cache_node(np);
653 
654         of_node_put(np);
655 
656         return cache;
657 }
658 
659 static void traverse_core_siblings(int cpu, bool add)
660 {
661         struct device_node *l2_cache, *np;
662         const struct cpumask *mask;
663         int i, chip, plen;
664         const __be32 *prop;
665 
666         /* First see if we have ibm,chip-id properties in cpu nodes */
667         np = of_get_cpu_node(cpu, NULL);
668         if (np) {
669                 chip = -1;
670                 prop = of_get_property(np, "ibm,chip-id", &plen);
671                 if (prop && plen == sizeof(int))
672                         chip = of_read_number(prop, 1);
673                 of_node_put(np);
674                 if (chip >= 0) {
675                         traverse_siblings_chip_id(cpu, add, chip);
676                         return;
677                 }
678         }
679 
680         l2_cache = cpu_to_l2cache(cpu);
681         mask = add ? cpu_online_mask : cpu_present_mask;
682         for_each_cpu(i, mask) {
683                 np = cpu_to_l2cache(i);
684                 if (!np)
685                         continue;
686                 if (np == l2_cache) {
687                         if (add) {
688                                 cpumask_set_cpu(cpu, cpu_core_mask(i));
689                                 cpumask_set_cpu(i, cpu_core_mask(cpu));
690                         } else {
691                                 cpumask_clear_cpu(cpu, cpu_core_mask(i));
692                                 cpumask_clear_cpu(i, cpu_core_mask(cpu));
693                         }
694                 }
695                 of_node_put(np);
696         }
697         of_node_put(l2_cache);
698 }
699 
700 /* Activate a secondary processor. */
701 void start_secondary(void *unused)
702 {
703         unsigned int cpu = smp_processor_id();
704         int i, base;
705 
706         atomic_inc(&init_mm.mm_count);
707         current->active_mm = &init_mm;
708 
709         smp_store_cpu_info(cpu);
710         set_dec(tb_ticks_per_jiffy);
711         preempt_disable();
712         cpu_callin_map[cpu] = 1;
713 
714         if (smp_ops->setup_cpu)
715                 smp_ops->setup_cpu(cpu);
716         if (smp_ops->take_timebase)
717                 smp_ops->take_timebase();
718 
719         secondary_cpu_time_init();
720 
721 #ifdef CONFIG_PPC64
722         if (system_state == SYSTEM_RUNNING)
723                 vdso_data->processorCount++;
724 
725         vdso_getcpu_init();
726 #endif
727         /* Update sibling maps */
728         base = cpu_first_thread_sibling(cpu);
729         for (i = 0; i < threads_per_core; i++) {
730                 if (cpu_is_offline(base + i) && (cpu != base + i))
731                         continue;
732                 cpumask_set_cpu(cpu, cpu_sibling_mask(base + i));
733                 cpumask_set_cpu(base + i, cpu_sibling_mask(cpu));
734 
735                 /* cpu_core_map should be a superset of
736                  * cpu_sibling_map even if we don't have cache
737                  * information, so update the former here, too.
738                  */
739                 cpumask_set_cpu(cpu, cpu_core_mask(base + i));
740                 cpumask_set_cpu(base + i, cpu_core_mask(cpu));
741         }
742         traverse_core_siblings(cpu, true);
743 
744         set_numa_node(numa_cpu_lookup_table[cpu]);
745         set_numa_mem(local_memory_node(numa_cpu_lookup_table[cpu]));
746 
747         smp_wmb();
748         notify_cpu_starting(cpu);
749         set_cpu_online(cpu, true);
750 
751         local_irq_enable();
752 
753         cpu_startup_entry(CPUHP_AP_ONLINE_IDLE);
754 
755         BUG();
756 }
757 
758 int setup_profiling_timer(unsigned int multiplier)
759 {
760         return 0;
761 }
762 
763 #ifdef CONFIG_SCHED_SMT
764 /* cpumask of CPUs with asymetric SMT dependancy */
765 static int powerpc_smt_flags(void)
766 {
767         int flags = SD_SHARE_CPUCAPACITY | SD_SHARE_PKG_RESOURCES;
768 
769         if (cpu_has_feature(CPU_FTR_ASYM_SMT)) {
770                 printk_once(KERN_INFO "Enabling Asymmetric SMT scheduling\n");
771                 flags |= SD_ASYM_PACKING;
772         }
773         return flags;
774 }
775 #endif
776 
777 static struct sched_domain_topology_level powerpc_topology[] = {
778 #ifdef CONFIG_SCHED_SMT
779         { cpu_smt_mask, powerpc_smt_flags, SD_INIT_NAME(SMT) },
780 #endif
781         { cpu_cpu_mask, SD_INIT_NAME(DIE) },
782         { NULL, },
783 };
784 
785 void __init smp_cpus_done(unsigned int max_cpus)
786 {
787         cpumask_var_t old_mask;
788 
789         /* We want the setup_cpu() here to be called from CPU 0, but our
790          * init thread may have been "borrowed" by another CPU in the meantime
791          * se we pin us down to CPU 0 for a short while
792          */
793         alloc_cpumask_var(&old_mask, GFP_NOWAIT);
794         cpumask_copy(old_mask, tsk_cpus_allowed(current));
795         set_cpus_allowed_ptr(current, cpumask_of(boot_cpuid));
796         
797         if (smp_ops && smp_ops->setup_cpu)
798                 smp_ops->setup_cpu(boot_cpuid);
799 
800         set_cpus_allowed_ptr(current, old_mask);
801 
802         free_cpumask_var(old_mask);
803 
804         if (smp_ops && smp_ops->bringup_done)
805                 smp_ops->bringup_done();
806 
807         dump_numa_cpu_topology();
808 
809         set_sched_topology(powerpc_topology);
810 
811 }
812 
813 #ifdef CONFIG_HOTPLUG_CPU
814 int __cpu_disable(void)
815 {
816         int cpu = smp_processor_id();
817         int base, i;
818         int err;
819 
820         if (!smp_ops->cpu_disable)
821                 return -ENOSYS;
822 
823         err = smp_ops->cpu_disable();
824         if (err)
825                 return err;
826 
827         /* Update sibling maps */
828         base = cpu_first_thread_sibling(cpu);
829         for (i = 0; i < threads_per_core; i++) {
830                 cpumask_clear_cpu(cpu, cpu_sibling_mask(base + i));
831                 cpumask_clear_cpu(base + i, cpu_sibling_mask(cpu));
832                 cpumask_clear_cpu(cpu, cpu_core_mask(base + i));
833                 cpumask_clear_cpu(base + i, cpu_core_mask(cpu));
834         }
835         traverse_core_siblings(cpu, false);
836 
837         return 0;
838 }
839 
840 void __cpu_die(unsigned int cpu)
841 {
842         if (smp_ops->cpu_die)
843                 smp_ops->cpu_die(cpu);
844 }
845 
846 void cpu_die(void)
847 {
848         if (ppc_md.cpu_die)
849                 ppc_md.cpu_die();
850 
851         /* If we return, we re-enter start_secondary */
852         start_secondary_resume();
853 }
854 
855 #endif
856 

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