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Linux/arch/powerpc/kernel/smp.c

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Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  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         int 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_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 
244 irqreturn_t smp_ipi_demux(void)
245 {
246         struct cpu_messages *info = &__get_cpu_var(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 
267 static 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 
277 void smp_send_reschedule(int cpu)
278 {
279         if (likely(smp_ops))
280                 do_message_pass(cpu, PPC_MSG_RESCHEDULE);
281 }
282 EXPORT_SYMBOL_GPL(smp_send_reschedule);
283 
284 void arch_send_call_function_single_ipi(int cpu)
285 {
286         do_message_pass(cpu, PPC_MSG_CALL_FUNCTION);
287 }
288 
289 void 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
298 void 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)
308 void 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
323 void 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 
333 static 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 
343 void smp_send_stop(void)
344 {
345         smp_call_function(stop_this_cpu, NULL, 0);
346 }
347 
348 struct thread_info *current_set[NR_CPUS];
349 
350 static 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 
359 void __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 
397 void 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 
409 int 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 
424 void 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 
437 void generic_mach_cpu_die(void)
438 {
439         unsigned int cpu;
440 
441         local_irq_disable();
442         idle_task_exit();
443         cpu = smp_processor_id();
444         printk(KERN_DEBUG "CPU%d offline\n", cpu);
445         __get_cpu_var(cpu_state) = CPU_DEAD;
446         smp_wmb();
447         while (__get_cpu_var(cpu_state) != CPU_UP_PREPARE)
448                 cpu_relax();
449 }
450 
451 void generic_set_cpu_dead(unsigned int cpu)
452 {
453         per_cpu(cpu_state, cpu) = CPU_DEAD;
454 }
455 
456 /*
457  * The cpu_state should be set to CPU_UP_PREPARE in kick_cpu(), otherwise
458  * the cpu_state is always CPU_DEAD after calling generic_set_cpu_dead(),
459  * which makes the delay in generic_cpu_die() not happen.
460  */
461 void generic_set_cpu_up(unsigned int cpu)
462 {
463         per_cpu(cpu_state, cpu) = CPU_UP_PREPARE;
464 }
465 
466 int generic_check_cpu_restart(unsigned int cpu)
467 {
468         return per_cpu(cpu_state, cpu) == CPU_UP_PREPARE;
469 }
470 
471 static bool secondaries_inhibited(void)
472 {
473         return kvm_hv_mode_active();
474 }
475 
476 #else /* HOTPLUG_CPU */
477 
478 #define secondaries_inhibited()         0
479 
480 #endif
481 
482 static void cpu_idle_thread_init(unsigned int cpu, struct task_struct *idle)
483 {
484         struct thread_info *ti = task_thread_info(idle);
485 
486 #ifdef CONFIG_PPC64
487         paca[cpu].__current = idle;
488         paca[cpu].kstack = (unsigned long)ti + THREAD_SIZE - STACK_FRAME_OVERHEAD;
489 #endif
490         ti->cpu = cpu;
491         secondary_ti = current_set[cpu] = ti;
492 }
493 
494 int __cpu_up(unsigned int cpu, struct task_struct *tidle)
495 {
496         int rc, c;
497 
498         /*
499          * Don't allow secondary threads to come online if inhibited
500          */
501         if (threads_per_core > 1 && secondaries_inhibited() &&
502             cpu_thread_in_subcore(cpu))
503                 return -EBUSY;
504 
505         if (smp_ops == NULL ||
506             (smp_ops->cpu_bootable && !smp_ops->cpu_bootable(cpu)))
507                 return -EINVAL;
508 
509         cpu_idle_thread_init(cpu, tidle);
510 
511         /* Make sure callin-map entry is 0 (can be leftover a CPU
512          * hotplug
513          */
514         cpu_callin_map[cpu] = 0;
515 
516         /* The information for processor bringup must
517          * be written out to main store before we release
518          * the processor.
519          */
520         smp_mb();
521 
522         /* wake up cpus */
523         DBG("smp: kicking cpu %d\n", cpu);
524         rc = smp_ops->kick_cpu(cpu);
525         if (rc) {
526                 pr_err("smp: failed starting cpu %d (rc %d)\n", cpu, rc);
527                 return rc;
528         }
529 
530         /*
531          * wait to see if the cpu made a callin (is actually up).
532          * use this value that I found through experimentation.
533          * -- Cort
534          */
535         if (system_state < SYSTEM_RUNNING)
536                 for (c = 50000; c && !cpu_callin_map[cpu]; c--)
537                         udelay(100);
538 #ifdef CONFIG_HOTPLUG_CPU
539         else
540                 /*
541                  * CPUs can take much longer to come up in the
542                  * hotplug case.  Wait five seconds.
543                  */
544                 for (c = 5000; c && !cpu_callin_map[cpu]; c--)
545                         msleep(1);
546 #endif
547 
548         if (!cpu_callin_map[cpu]) {
549                 printk(KERN_ERR "Processor %u is stuck.\n", cpu);
550                 return -ENOENT;
551         }
552 
553         DBG("Processor %u found.\n", cpu);
554 
555         if (smp_ops->give_timebase)
556                 smp_ops->give_timebase();
557 
558         /* Wait until cpu puts itself in the online map */
559         while (!cpu_online(cpu))
560                 cpu_relax();
561 
562         return 0;
563 }
564 
565 /* Return the value of the reg property corresponding to the given
566  * logical cpu.
567  */
568 int cpu_to_core_id(int cpu)
569 {
570         struct device_node *np;
571         const __be32 *reg;
572         int id = -1;
573 
574         np = of_get_cpu_node(cpu, NULL);
575         if (!np)
576                 goto out;
577 
578         reg = of_get_property(np, "reg", NULL);
579         if (!reg)
580                 goto out;
581 
582         id = be32_to_cpup(reg);
583 out:
584         of_node_put(np);
585         return id;
586 }
587 
588 /* Helper routines for cpu to core mapping */
589 int cpu_core_index_of_thread(int cpu)
590 {
591         return cpu >> threads_shift;
592 }
593 EXPORT_SYMBOL_GPL(cpu_core_index_of_thread);
594 
595 int cpu_first_thread_of_core(int core)
596 {
597         return core << threads_shift;
598 }
599 EXPORT_SYMBOL_GPL(cpu_first_thread_of_core);
600 
601 static void traverse_siblings_chip_id(int cpu, bool add, int chipid)
602 {
603         const struct cpumask *mask;
604         struct device_node *np;
605         int i, plen;
606         const __be32 *prop;
607 
608         mask = add ? cpu_online_mask : cpu_present_mask;
609         for_each_cpu(i, mask) {
610                 np = of_get_cpu_node(i, NULL);
611                 if (!np)
612                         continue;
613                 prop = of_get_property(np, "ibm,chip-id", &plen);
614                 if (prop && plen == sizeof(int) &&
615                     of_read_number(prop, 1) == chipid) {
616                         if (add) {
617                                 cpumask_set_cpu(cpu, cpu_core_mask(i));
618                                 cpumask_set_cpu(i, cpu_core_mask(cpu));
619                         } else {
620                                 cpumask_clear_cpu(cpu, cpu_core_mask(i));
621                                 cpumask_clear_cpu(i, cpu_core_mask(cpu));
622                         }
623                 }
624                 of_node_put(np);
625         }
626 }
627 
628 /* Must be called when no change can occur to cpu_present_mask,
629  * i.e. during cpu online or offline.
630  */
631 static struct device_node *cpu_to_l2cache(int cpu)
632 {
633         struct device_node *np;
634         struct device_node *cache;
635 
636         if (!cpu_present(cpu))
637                 return NULL;
638 
639         np = of_get_cpu_node(cpu, NULL);
640         if (np == NULL)
641                 return NULL;
642 
643         cache = of_find_next_cache_node(np);
644 
645         of_node_put(np);
646 
647         return cache;
648 }
649 
650 static void traverse_core_siblings(int cpu, bool add)
651 {
652         struct device_node *l2_cache, *np;
653         const struct cpumask *mask;
654         int i, chip, plen;
655         const __be32 *prop;
656 
657         /* First see if we have ibm,chip-id properties in cpu nodes */
658         np = of_get_cpu_node(cpu, NULL);
659         if (np) {
660                 chip = -1;
661                 prop = of_get_property(np, "ibm,chip-id", &plen);
662                 if (prop && plen == sizeof(int))
663                         chip = of_read_number(prop, 1);
664                 of_node_put(np);
665                 if (chip >= 0) {
666                         traverse_siblings_chip_id(cpu, add, chip);
667                         return;
668                 }
669         }
670 
671         l2_cache = cpu_to_l2cache(cpu);
672         mask = add ? cpu_online_mask : cpu_present_mask;
673         for_each_cpu(i, mask) {
674                 np = cpu_to_l2cache(i);
675                 if (!np)
676                         continue;
677                 if (np == l2_cache) {
678                         if (add) {
679                                 cpumask_set_cpu(cpu, cpu_core_mask(i));
680                                 cpumask_set_cpu(i, cpu_core_mask(cpu));
681                         } else {
682                                 cpumask_clear_cpu(cpu, cpu_core_mask(i));
683                                 cpumask_clear_cpu(i, cpu_core_mask(cpu));
684                         }
685                 }
686                 of_node_put(np);
687         }
688         of_node_put(l2_cache);
689 }
690 
691 /* Activate a secondary processor. */
692 void start_secondary(void *unused)
693 {
694         unsigned int cpu = smp_processor_id();
695         int i, base;
696 
697         atomic_inc(&init_mm.mm_count);
698         current->active_mm = &init_mm;
699 
700         smp_store_cpu_info(cpu);
701         set_dec(tb_ticks_per_jiffy);
702         preempt_disable();
703         cpu_callin_map[cpu] = 1;
704 
705         if (smp_ops->setup_cpu)
706                 smp_ops->setup_cpu(cpu);
707         if (smp_ops->take_timebase)
708                 smp_ops->take_timebase();
709 
710         secondary_cpu_time_init();
711 
712 #ifdef CONFIG_PPC64
713         if (system_state == SYSTEM_RUNNING)
714                 vdso_data->processorCount++;
715 
716         vdso_getcpu_init();
717 #endif
718         /* Update sibling maps */
719         base = cpu_first_thread_sibling(cpu);
720         for (i = 0; i < threads_per_core; i++) {
721                 if (cpu_is_offline(base + i) && (cpu != base + i))
722                         continue;
723                 cpumask_set_cpu(cpu, cpu_sibling_mask(base + i));
724                 cpumask_set_cpu(base + i, cpu_sibling_mask(cpu));
725 
726                 /* cpu_core_map should be a superset of
727                  * cpu_sibling_map even if we don't have cache
728                  * information, so update the former here, too.
729                  */
730                 cpumask_set_cpu(cpu, cpu_core_mask(base + i));
731                 cpumask_set_cpu(base + i, cpu_core_mask(cpu));
732         }
733         traverse_core_siblings(cpu, true);
734 
735         set_numa_node(numa_cpu_lookup_table[cpu]);
736         set_numa_mem(local_memory_node(numa_cpu_lookup_table[cpu]));
737 
738         smp_wmb();
739         notify_cpu_starting(cpu);
740         set_cpu_online(cpu, true);
741 
742         local_irq_enable();
743 
744         cpu_startup_entry(CPUHP_ONLINE);
745 
746         BUG();
747 }
748 
749 int setup_profiling_timer(unsigned int multiplier)
750 {
751         return 0;
752 }
753 
754 #ifdef CONFIG_SCHED_SMT
755 /* cpumask of CPUs with asymetric SMT dependancy */
756 static int powerpc_smt_flags(void)
757 {
758         int flags = SD_SHARE_CPUCAPACITY | SD_SHARE_PKG_RESOURCES;
759 
760         if (cpu_has_feature(CPU_FTR_ASYM_SMT)) {
761                 printk_once(KERN_INFO "Enabling Asymmetric SMT scheduling\n");
762                 flags |= SD_ASYM_PACKING;
763         }
764         return flags;
765 }
766 #endif
767 
768 static struct sched_domain_topology_level powerpc_topology[] = {
769 #ifdef CONFIG_SCHED_SMT
770         { cpu_smt_mask, powerpc_smt_flags, SD_INIT_NAME(SMT) },
771 #endif
772         { cpu_cpu_mask, SD_INIT_NAME(DIE) },
773         { NULL, },
774 };
775 
776 void __init smp_cpus_done(unsigned int max_cpus)
777 {
778         cpumask_var_t old_mask;
779 
780         /* We want the setup_cpu() here to be called from CPU 0, but our
781          * init thread may have been "borrowed" by another CPU in the meantime
782          * se we pin us down to CPU 0 for a short while
783          */
784         alloc_cpumask_var(&old_mask, GFP_NOWAIT);
785         cpumask_copy(old_mask, tsk_cpus_allowed(current));
786         set_cpus_allowed_ptr(current, cpumask_of(boot_cpuid));
787         
788         if (smp_ops && smp_ops->setup_cpu)
789                 smp_ops->setup_cpu(boot_cpuid);
790 
791         set_cpus_allowed_ptr(current, old_mask);
792 
793         free_cpumask_var(old_mask);
794 
795         if (smp_ops && smp_ops->bringup_done)
796                 smp_ops->bringup_done();
797 
798         dump_numa_cpu_topology();
799 
800         set_sched_topology(powerpc_topology);
801 
802 }
803 
804 #ifdef CONFIG_HOTPLUG_CPU
805 int __cpu_disable(void)
806 {
807         int cpu = smp_processor_id();
808         int base, i;
809         int err;
810 
811         if (!smp_ops->cpu_disable)
812                 return -ENOSYS;
813 
814         err = smp_ops->cpu_disable();
815         if (err)
816                 return err;
817 
818         /* Update sibling maps */
819         base = cpu_first_thread_sibling(cpu);
820         for (i = 0; i < threads_per_core; i++) {
821                 cpumask_clear_cpu(cpu, cpu_sibling_mask(base + i));
822                 cpumask_clear_cpu(base + i, cpu_sibling_mask(cpu));
823                 cpumask_clear_cpu(cpu, cpu_core_mask(base + i));
824                 cpumask_clear_cpu(base + i, cpu_core_mask(cpu));
825         }
826         traverse_core_siblings(cpu, false);
827 
828         return 0;
829 }
830 
831 void __cpu_die(unsigned int cpu)
832 {
833         if (smp_ops->cpu_die)
834                 smp_ops->cpu_die(cpu);
835 }
836 
837 void cpu_die(void)
838 {
839         if (ppc_md.cpu_die)
840                 ppc_md.cpu_die();
841 
842         /* If we return, we re-enter start_secondary */
843         start_secondary_resume();
844 }
845 
846 #endif
847 

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