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10#include <linux/module.h>
11#include <linux/delay.h>
12#include <linux/init.h>
13#include <linux/spinlock.h>
14#include <linux/sched.h>
15#include <linux/interrupt.h>
16#include <linux/cache.h>
17#include <linux/profile.h>
18#include <linux/errno.h>
19#include <linux/mm.h>
20#include <linux/err.h>
21#include <linux/cpu.h>
22#include <linux/seq_file.h>
23#include <linux/irq.h>
24#include <linux/nmi.h>
25#include <linux/percpu.h>
26#include <linux/clockchips.h>
27#include <linux/completion.h>
28#include <linux/cpufreq.h>
29#include <linux/irq_work.h>
30
31#include <linux/atomic.h>
32#include <asm/smp.h>
33#include <asm/cacheflush.h>
34#include <asm/cpu.h>
35#include <asm/cputype.h>
36#include <asm/exception.h>
37#include <asm/idmap.h>
38#include <asm/topology.h>
39#include <asm/mmu_context.h>
40#include <asm/pgtable.h>
41#include <asm/pgalloc.h>
42#include <asm/processor.h>
43#include <asm/sections.h>
44#include <asm/tlbflush.h>
45#include <asm/ptrace.h>
46#include <asm/smp_plat.h>
47#include <asm/virt.h>
48#include <asm/mach/arch.h>
49#include <asm/mpu.h>
50
51#define CREATE_TRACE_POINTS
52#include <trace/events/ipi.h>
53
54
55
56
57
58
59struct secondary_data secondary_data;
60
61
62
63
64
65volatile int pen_release = -1;
66
67enum ipi_msg_type {
68 IPI_WAKEUP,
69 IPI_TIMER,
70 IPI_RESCHEDULE,
71 IPI_CALL_FUNC,
72 IPI_CALL_FUNC_SINGLE,
73 IPI_CPU_STOP,
74 IPI_IRQ_WORK,
75 IPI_COMPLETION,
76 IPI_CPU_BACKTRACE = 15,
77};
78
79static DECLARE_COMPLETION(cpu_running);
80
81static struct smp_operations smp_ops;
82
83void __init smp_set_ops(struct smp_operations *ops)
84{
85 if (ops)
86 smp_ops = *ops;
87};
88
89static unsigned long get_arch_pgd(pgd_t *pgd)
90{
91#ifdef CONFIG_ARM_LPAE
92 return __phys_to_pfn(virt_to_phys(pgd));
93#else
94 return virt_to_phys(pgd);
95#endif
96}
97
98int __cpu_up(unsigned int cpu, struct task_struct *idle)
99{
100 int ret;
101
102 if (!smp_ops.smp_boot_secondary)
103 return -ENOSYS;
104
105
106
107
108
109 secondary_data.stack = task_stack_page(idle) + THREAD_START_SP;
110#ifdef CONFIG_ARM_MPU
111 secondary_data.mpu_rgn_szr = mpu_rgn_info.rgns[MPU_RAM_REGION].drsr;
112#endif
113
114#ifdef CONFIG_MMU
115 secondary_data.pgdir = virt_to_phys(idmap_pgd);
116 secondary_data.swapper_pg_dir = get_arch_pgd(swapper_pg_dir);
117#endif
118 sync_cache_w(&secondary_data);
119
120
121
122
123 ret = smp_ops.smp_boot_secondary(cpu, idle);
124 if (ret == 0) {
125
126
127
128
129 wait_for_completion_timeout(&cpu_running,
130 msecs_to_jiffies(1000));
131
132 if (!cpu_online(cpu)) {
133 pr_crit("CPU%u: failed to come online\n", cpu);
134 ret = -EIO;
135 }
136 } else {
137 pr_err("CPU%u: failed to boot: %d\n", cpu, ret);
138 }
139
140
141 memset(&secondary_data, 0, sizeof(secondary_data));
142 return ret;
143}
144
145
146void __init smp_init_cpus(void)
147{
148 if (smp_ops.smp_init_cpus)
149 smp_ops.smp_init_cpus();
150}
151
152int platform_can_secondary_boot(void)
153{
154 return !!smp_ops.smp_boot_secondary;
155}
156
157int platform_can_cpu_hotplug(void)
158{
159#ifdef CONFIG_HOTPLUG_CPU
160 if (smp_ops.cpu_kill)
161 return 1;
162#endif
163
164 return 0;
165}
166
167#ifdef CONFIG_HOTPLUG_CPU
168static int platform_cpu_kill(unsigned int cpu)
169{
170 if (smp_ops.cpu_kill)
171 return smp_ops.cpu_kill(cpu);
172 return 1;
173}
174
175static int platform_cpu_disable(unsigned int cpu)
176{
177 if (smp_ops.cpu_disable)
178 return smp_ops.cpu_disable(cpu);
179
180 return 0;
181}
182
183int platform_can_hotplug_cpu(unsigned int cpu)
184{
185
186 if (!smp_ops.cpu_die)
187 return 0;
188
189 if (smp_ops.cpu_can_disable)
190 return smp_ops.cpu_can_disable(cpu);
191
192
193
194
195
196
197 return cpu != 0;
198}
199
200
201
202
203int __cpu_disable(void)
204{
205 unsigned int cpu = smp_processor_id();
206 int ret;
207
208 ret = platform_cpu_disable(cpu);
209 if (ret)
210 return ret;
211
212
213
214
215
216 set_cpu_online(cpu, false);
217
218
219
220
221 migrate_irqs();
222
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227
228
229
230 flush_cache_louis();
231 local_flush_tlb_all();
232
233 clear_tasks_mm_cpumask(cpu);
234
235 return 0;
236}
237
238static DECLARE_COMPLETION(cpu_died);
239
240
241
242
243
244void __cpu_die(unsigned int cpu)
245{
246 if (!wait_for_completion_timeout(&cpu_died, msecs_to_jiffies(5000))) {
247 pr_err("CPU%u: cpu didn't die\n", cpu);
248 return;
249 }
250 pr_notice("CPU%u: shutdown\n", cpu);
251
252
253
254
255
256
257
258
259 if (!platform_cpu_kill(cpu))
260 pr_err("CPU%u: unable to kill\n", cpu);
261}
262
263
264
265
266
267
268
269
270
271void arch_cpu_idle_dead(void)
272{
273 unsigned int cpu = smp_processor_id();
274
275 idle_task_exit();
276
277 local_irq_disable();
278
279
280
281
282
283
284
285 flush_cache_louis();
286
287
288
289
290
291
292 complete(&cpu_died);
293
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297
298
299
300 flush_cache_louis();
301
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310
311
312
313
314 if (smp_ops.cpu_die)
315 smp_ops.cpu_die(cpu);
316
317 pr_warn("CPU%u: smp_ops.cpu_die() returned, trying to resuscitate\n",
318 cpu);
319
320
321
322
323
324
325 __asm__("mov sp, %0\n"
326 " mov fp, #0\n"
327 " b secondary_start_kernel"
328 :
329 : "r" (task_stack_page(current) + THREAD_SIZE - 8));
330}
331#endif
332
333
334
335
336
337static void smp_store_cpu_info(unsigned int cpuid)
338{
339 struct cpuinfo_arm *cpu_info = &per_cpu(cpu_data, cpuid);
340
341 cpu_info->loops_per_jiffy = loops_per_jiffy;
342 cpu_info->cpuid = read_cpuid_id();
343
344 store_cpu_topology(cpuid);
345}
346
347
348
349
350
351asmlinkage void secondary_start_kernel(void)
352{
353 struct mm_struct *mm = &init_mm;
354 unsigned int cpu;
355
356
357
358
359
360 cpu_switch_mm(mm->pgd, mm);
361 local_flush_bp_all();
362 enter_lazy_tlb(mm, current);
363 local_flush_tlb_all();
364
365
366
367
368
369 cpu = smp_processor_id();
370 atomic_inc(&mm->mm_count);
371 current->active_mm = mm;
372 cpumask_set_cpu(cpu, mm_cpumask(mm));
373
374 cpu_init();
375
376 pr_debug("CPU%u: Booted secondary processor\n", cpu);
377
378 preempt_disable();
379 trace_hardirqs_off();
380
381
382
383
384 if (smp_ops.smp_secondary_init)
385 smp_ops.smp_secondary_init(cpu);
386
387 notify_cpu_starting(cpu);
388
389 calibrate_delay();
390
391 smp_store_cpu_info(cpu);
392
393
394
395
396
397
398 set_cpu_online(cpu, true);
399 complete(&cpu_running);
400
401 local_irq_enable();
402 local_fiq_enable();
403
404
405
406
407 cpu_startup_entry(CPUHP_ONLINE);
408}
409
410void __init smp_cpus_done(unsigned int max_cpus)
411{
412 int cpu;
413 unsigned long bogosum = 0;
414
415 for_each_online_cpu(cpu)
416 bogosum += per_cpu(cpu_data, cpu).loops_per_jiffy;
417
418 printk(KERN_INFO "SMP: Total of %d processors activated "
419 "(%lu.%02lu BogoMIPS).\n",
420 num_online_cpus(),
421 bogosum / (500000/HZ),
422 (bogosum / (5000/HZ)) % 100);
423
424 hyp_mode_check();
425}
426
427void __init smp_prepare_boot_cpu(void)
428{
429 set_my_cpu_offset(per_cpu_offset(smp_processor_id()));
430}
431
432void __init smp_prepare_cpus(unsigned int max_cpus)
433{
434 unsigned int ncores = num_possible_cpus();
435
436 init_cpu_topology();
437
438 smp_store_cpu_info(smp_processor_id());
439
440
441
442
443 if (max_cpus > ncores)
444 max_cpus = ncores;
445 if (ncores > 1 && max_cpus) {
446
447
448
449
450
451
452 init_cpu_present(cpu_possible_mask);
453
454
455
456
457
458 if (smp_ops.smp_prepare_cpus)
459 smp_ops.smp_prepare_cpus(max_cpus);
460 }
461}
462
463static void (*__smp_cross_call)(const struct cpumask *, unsigned int);
464
465void __init set_smp_cross_call(void (*fn)(const struct cpumask *, unsigned int))
466{
467 if (!__smp_cross_call)
468 __smp_cross_call = fn;
469}
470
471static const char *ipi_types[NR_IPI] __tracepoint_string = {
472#define S(x,s) [x] = s
473 S(IPI_WAKEUP, "CPU wakeup interrupts"),
474 S(IPI_TIMER, "Timer broadcast interrupts"),
475 S(IPI_RESCHEDULE, "Rescheduling interrupts"),
476 S(IPI_CALL_FUNC, "Function call interrupts"),
477 S(IPI_CALL_FUNC_SINGLE, "Single function call interrupts"),
478 S(IPI_CPU_STOP, "CPU stop interrupts"),
479 S(IPI_IRQ_WORK, "IRQ work interrupts"),
480 S(IPI_COMPLETION, "completion interrupts"),
481};
482
483static void smp_cross_call(const struct cpumask *target, unsigned int ipinr)
484{
485 trace_ipi_raise(target, ipi_types[ipinr]);
486 __smp_cross_call(target, ipinr);
487}
488
489void show_ipi_list(struct seq_file *p, int prec)
490{
491 unsigned int cpu, i;
492
493 for (i = 0; i < NR_IPI; i++) {
494 seq_printf(p, "%*s%u: ", prec - 1, "IPI", i);
495
496 for_each_online_cpu(cpu)
497 seq_printf(p, "%10u ",
498 __get_irq_stat(cpu, ipi_irqs[i]));
499
500 seq_printf(p, " %s\n", ipi_types[i]);
501 }
502}
503
504u64 smp_irq_stat_cpu(unsigned int cpu)
505{
506 u64 sum = 0;
507 int i;
508
509 for (i = 0; i < NR_IPI; i++)
510 sum += __get_irq_stat(cpu, ipi_irqs[i]);
511
512 return sum;
513}
514
515void arch_send_call_function_ipi_mask(const struct cpumask *mask)
516{
517 smp_cross_call(mask, IPI_CALL_FUNC);
518}
519
520void arch_send_wakeup_ipi_mask(const struct cpumask *mask)
521{
522 smp_cross_call(mask, IPI_WAKEUP);
523}
524
525void arch_send_call_function_single_ipi(int cpu)
526{
527 smp_cross_call(cpumask_of(cpu), IPI_CALL_FUNC_SINGLE);
528}
529
530#ifdef CONFIG_IRQ_WORK
531void arch_irq_work_raise(void)
532{
533 if (arch_irq_work_has_interrupt())
534 smp_cross_call(cpumask_of(smp_processor_id()), IPI_IRQ_WORK);
535}
536#endif
537
538#ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
539void tick_broadcast(const struct cpumask *mask)
540{
541 smp_cross_call(mask, IPI_TIMER);
542}
543#endif
544
545static DEFINE_RAW_SPINLOCK(stop_lock);
546
547
548
549
550static void ipi_cpu_stop(unsigned int cpu)
551{
552 if (system_state == SYSTEM_BOOTING ||
553 system_state == SYSTEM_RUNNING) {
554 raw_spin_lock(&stop_lock);
555 pr_crit("CPU%u: stopping\n", cpu);
556 dump_stack();
557 raw_spin_unlock(&stop_lock);
558 }
559
560 set_cpu_online(cpu, false);
561
562 local_fiq_disable();
563 local_irq_disable();
564
565 while (1)
566 cpu_relax();
567}
568
569static DEFINE_PER_CPU(struct completion *, cpu_completion);
570
571int register_ipi_completion(struct completion *completion, int cpu)
572{
573 per_cpu(cpu_completion, cpu) = completion;
574 return IPI_COMPLETION;
575}
576
577static void ipi_complete(unsigned int cpu)
578{
579 complete(per_cpu(cpu_completion, cpu));
580}
581
582
583
584
585asmlinkage void __exception_irq_entry do_IPI(int ipinr, struct pt_regs *regs)
586{
587 handle_IPI(ipinr, regs);
588}
589
590void handle_IPI(int ipinr, struct pt_regs *regs)
591{
592 unsigned int cpu = smp_processor_id();
593 struct pt_regs *old_regs = set_irq_regs(regs);
594
595 if ((unsigned)ipinr < NR_IPI) {
596 trace_ipi_entry_rcuidle(ipi_types[ipinr]);
597 __inc_irq_stat(cpu, ipi_irqs[ipinr]);
598 }
599
600 switch (ipinr) {
601 case IPI_WAKEUP:
602 break;
603
604#ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
605 case IPI_TIMER:
606 irq_enter();
607 tick_receive_broadcast();
608 irq_exit();
609 break;
610#endif
611
612 case IPI_RESCHEDULE:
613 scheduler_ipi();
614 break;
615
616 case IPI_CALL_FUNC:
617 irq_enter();
618 generic_smp_call_function_interrupt();
619 irq_exit();
620 break;
621
622 case IPI_CALL_FUNC_SINGLE:
623 irq_enter();
624 generic_smp_call_function_single_interrupt();
625 irq_exit();
626 break;
627
628 case IPI_CPU_STOP:
629 irq_enter();
630 ipi_cpu_stop(cpu);
631 irq_exit();
632 break;
633
634#ifdef CONFIG_IRQ_WORK
635 case IPI_IRQ_WORK:
636 irq_enter();
637 irq_work_run();
638 irq_exit();
639 break;
640#endif
641
642 case IPI_COMPLETION:
643 irq_enter();
644 ipi_complete(cpu);
645 irq_exit();
646 break;
647
648 case IPI_CPU_BACKTRACE:
649 irq_enter();
650 nmi_cpu_backtrace(regs);
651 irq_exit();
652 break;
653
654 default:
655 pr_crit("CPU%u: Unknown IPI message 0x%x\n",
656 cpu, ipinr);
657 break;
658 }
659
660 if ((unsigned)ipinr < NR_IPI)
661 trace_ipi_exit_rcuidle(ipi_types[ipinr]);
662 set_irq_regs(old_regs);
663}
664
665void smp_send_reschedule(int cpu)
666{
667 smp_cross_call(cpumask_of(cpu), IPI_RESCHEDULE);
668}
669
670void smp_send_stop(void)
671{
672 unsigned long timeout;
673 struct cpumask mask;
674
675 cpumask_copy(&mask, cpu_online_mask);
676 cpumask_clear_cpu(smp_processor_id(), &mask);
677 if (!cpumask_empty(&mask))
678 smp_cross_call(&mask, IPI_CPU_STOP);
679
680
681 timeout = USEC_PER_SEC;
682 while (num_online_cpus() > 1 && timeout--)
683 udelay(1);
684
685 if (num_online_cpus() > 1)
686 pr_warn("SMP: failed to stop secondary CPUs\n");
687}
688
689
690
691
692int setup_profiling_timer(unsigned int multiplier)
693{
694 return -EINVAL;
695}
696
697#ifdef CONFIG_CPU_FREQ
698
699static DEFINE_PER_CPU(unsigned long, l_p_j_ref);
700static DEFINE_PER_CPU(unsigned long, l_p_j_ref_freq);
701static unsigned long global_l_p_j_ref;
702static unsigned long global_l_p_j_ref_freq;
703
704static int cpufreq_callback(struct notifier_block *nb,
705 unsigned long val, void *data)
706{
707 struct cpufreq_freqs *freq = data;
708 int cpu = freq->cpu;
709
710 if (freq->flags & CPUFREQ_CONST_LOOPS)
711 return NOTIFY_OK;
712
713 if (!per_cpu(l_p_j_ref, cpu)) {
714 per_cpu(l_p_j_ref, cpu) =
715 per_cpu(cpu_data, cpu).loops_per_jiffy;
716 per_cpu(l_p_j_ref_freq, cpu) = freq->old;
717 if (!global_l_p_j_ref) {
718 global_l_p_j_ref = loops_per_jiffy;
719 global_l_p_j_ref_freq = freq->old;
720 }
721 }
722
723 if ((val == CPUFREQ_PRECHANGE && freq->old < freq->new) ||
724 (val == CPUFREQ_POSTCHANGE && freq->old > freq->new)) {
725 loops_per_jiffy = cpufreq_scale(global_l_p_j_ref,
726 global_l_p_j_ref_freq,
727 freq->new);
728 per_cpu(cpu_data, cpu).loops_per_jiffy =
729 cpufreq_scale(per_cpu(l_p_j_ref, cpu),
730 per_cpu(l_p_j_ref_freq, cpu),
731 freq->new);
732 }
733 return NOTIFY_OK;
734}
735
736static struct notifier_block cpufreq_notifier = {
737 .notifier_call = cpufreq_callback,
738};
739
740static int __init register_cpufreq_notifier(void)
741{
742 return cpufreq_register_notifier(&cpufreq_notifier,
743 CPUFREQ_TRANSITION_NOTIFIER);
744}
745core_initcall(register_cpufreq_notifier);
746
747#endif
748
749static void raise_nmi(cpumask_t *mask)
750{
751 smp_cross_call(mask, IPI_CPU_BACKTRACE);
752}
753
754void arch_trigger_all_cpu_backtrace(bool include_self)
755{
756 nmi_trigger_all_cpu_backtrace(include_self, raise_nmi);
757}
758