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8
9#include <linux/cache.h>
10#include <linux/delay.h>
11#include <linux/init.h>
12#include <linux/interrupt.h>
13#include <linux/smp.h>
14#include <linux/spinlock.h>
15#include <linux/threads.h>
16#include <linux/export.h>
17#include <linux/time.h>
18#include <linux/timex.h>
19#include <linux/sched/mm.h>
20#include <linux/cpumask.h>
21#include <linux/cpu.h>
22#include <linux/err.h>
23#include <linux/ftrace.h>
24#include <linux/irqdomain.h>
25#include <linux/of.h>
26#include <linux/of_irq.h>
27
28#include <linux/atomic.h>
29#include <asm/cpu.h>
30#include <asm/ginvt.h>
31#include <asm/processor.h>
32#include <asm/idle.h>
33#include <asm/r4k-timer.h>
34#include <asm/mips-cps.h>
35#include <asm/mmu_context.h>
36#include <asm/time.h>
37#include <asm/setup.h>
38#include <asm/maar.h>
39
40int __cpu_number_map[CONFIG_MIPS_NR_CPU_NR_MAP];
41EXPORT_SYMBOL(__cpu_number_map);
42
43int __cpu_logical_map[NR_CPUS];
44EXPORT_SYMBOL(__cpu_logical_map);
45
46
47int smp_num_siblings = 1;
48EXPORT_SYMBOL(smp_num_siblings);
49
50
51cpumask_t cpu_sibling_map[NR_CPUS] __read_mostly;
52EXPORT_SYMBOL(cpu_sibling_map);
53
54
55cpumask_t cpu_core_map[NR_CPUS] __read_mostly;
56EXPORT_SYMBOL(cpu_core_map);
57
58static DECLARE_COMPLETION(cpu_starting);
59static DECLARE_COMPLETION(cpu_running);
60
61
62
63
64
65cpumask_t cpu_foreign_map[NR_CPUS] __read_mostly;
66EXPORT_SYMBOL(cpu_foreign_map);
67
68
69static cpumask_t cpu_sibling_setup_map;
70
71
72static cpumask_t cpu_core_setup_map;
73
74cpumask_t cpu_coherent_mask;
75
76#ifdef CONFIG_GENERIC_IRQ_IPI
77static struct irq_desc *call_desc;
78static struct irq_desc *sched_desc;
79#endif
80
81static inline void set_cpu_sibling_map(int cpu)
82{
83 int i;
84
85 cpumask_set_cpu(cpu, &cpu_sibling_setup_map);
86
87 if (smp_num_siblings > 1) {
88 for_each_cpu(i, &cpu_sibling_setup_map) {
89 if (cpus_are_siblings(cpu, i)) {
90 cpumask_set_cpu(i, &cpu_sibling_map[cpu]);
91 cpumask_set_cpu(cpu, &cpu_sibling_map[i]);
92 }
93 }
94 } else
95 cpumask_set_cpu(cpu, &cpu_sibling_map[cpu]);
96}
97
98static inline void set_cpu_core_map(int cpu)
99{
100 int i;
101
102 cpumask_set_cpu(cpu, &cpu_core_setup_map);
103
104 for_each_cpu(i, &cpu_core_setup_map) {
105 if (cpu_data[cpu].package == cpu_data[i].package) {
106 cpumask_set_cpu(i, &cpu_core_map[cpu]);
107 cpumask_set_cpu(cpu, &cpu_core_map[i]);
108 }
109 }
110}
111
112
113
114
115
116void calculate_cpu_foreign_map(void)
117{
118 int i, k, core_present;
119 cpumask_t temp_foreign_map;
120
121
122 cpumask_clear(&temp_foreign_map);
123 for_each_online_cpu(i) {
124 core_present = 0;
125 for_each_cpu(k, &temp_foreign_map)
126 if (cpus_are_siblings(i, k))
127 core_present = 1;
128 if (!core_present)
129 cpumask_set_cpu(i, &temp_foreign_map);
130 }
131
132 for_each_online_cpu(i)
133 cpumask_andnot(&cpu_foreign_map[i],
134 &temp_foreign_map, &cpu_sibling_map[i]);
135}
136
137const struct plat_smp_ops *mp_ops;
138EXPORT_SYMBOL(mp_ops);
139
140void register_smp_ops(const struct plat_smp_ops *ops)
141{
142 if (mp_ops)
143 printk(KERN_WARNING "Overriding previously set SMP ops\n");
144
145 mp_ops = ops;
146}
147
148#ifdef CONFIG_GENERIC_IRQ_IPI
149void mips_smp_send_ipi_single(int cpu, unsigned int action)
150{
151 mips_smp_send_ipi_mask(cpumask_of(cpu), action);
152}
153
154void mips_smp_send_ipi_mask(const struct cpumask *mask, unsigned int action)
155{
156 unsigned long flags;
157 unsigned int core;
158 int cpu;
159
160 local_irq_save(flags);
161
162 switch (action) {
163 case SMP_CALL_FUNCTION:
164 __ipi_send_mask(call_desc, mask);
165 break;
166
167 case SMP_RESCHEDULE_YOURSELF:
168 __ipi_send_mask(sched_desc, mask);
169 break;
170
171 default:
172 BUG();
173 }
174
175 if (mips_cpc_present()) {
176 for_each_cpu(cpu, mask) {
177 if (cpus_are_siblings(cpu, smp_processor_id()))
178 continue;
179
180 core = cpu_core(&cpu_data[cpu]);
181
182 while (!cpumask_test_cpu(cpu, &cpu_coherent_mask)) {
183 mips_cm_lock_other_cpu(cpu, CM_GCR_Cx_OTHER_BLOCK_LOCAL);
184 mips_cpc_lock_other(core);
185 write_cpc_co_cmd(CPC_Cx_CMD_PWRUP);
186 mips_cpc_unlock_other();
187 mips_cm_unlock_other();
188 }
189 }
190 }
191
192 local_irq_restore(flags);
193}
194
195
196static irqreturn_t ipi_resched_interrupt(int irq, void *dev_id)
197{
198 scheduler_ipi();
199
200 return IRQ_HANDLED;
201}
202
203static irqreturn_t ipi_call_interrupt(int irq, void *dev_id)
204{
205 generic_smp_call_function_interrupt();
206
207 return IRQ_HANDLED;
208}
209
210static struct irqaction irq_resched = {
211 .handler = ipi_resched_interrupt,
212 .flags = IRQF_PERCPU,
213 .name = "IPI resched"
214};
215
216static struct irqaction irq_call = {
217 .handler = ipi_call_interrupt,
218 .flags = IRQF_PERCPU,
219 .name = "IPI call"
220};
221
222static void smp_ipi_init_one(unsigned int virq,
223 struct irqaction *action)
224{
225 int ret;
226
227 irq_set_handler(virq, handle_percpu_irq);
228 ret = setup_irq(virq, action);
229 BUG_ON(ret);
230}
231
232static unsigned int call_virq, sched_virq;
233
234int mips_smp_ipi_allocate(const struct cpumask *mask)
235{
236 int virq;
237 struct irq_domain *ipidomain;
238 struct device_node *node;
239
240 node = of_irq_find_parent(of_root);
241 ipidomain = irq_find_matching_host(node, DOMAIN_BUS_IPI);
242
243
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245
246
247
248 if (node && !ipidomain)
249 ipidomain = irq_find_matching_host(NULL, DOMAIN_BUS_IPI);
250
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259
260
261
262 if (!ipidomain) {
263 BUG_ON(num_present_cpus() > 1);
264 return 0;
265 }
266
267 virq = irq_reserve_ipi(ipidomain, mask);
268 BUG_ON(!virq);
269 if (!call_virq)
270 call_virq = virq;
271
272 virq = irq_reserve_ipi(ipidomain, mask);
273 BUG_ON(!virq);
274 if (!sched_virq)
275 sched_virq = virq;
276
277 if (irq_domain_is_ipi_per_cpu(ipidomain)) {
278 int cpu;
279
280 for_each_cpu(cpu, mask) {
281 smp_ipi_init_one(call_virq + cpu, &irq_call);
282 smp_ipi_init_one(sched_virq + cpu, &irq_resched);
283 }
284 } else {
285 smp_ipi_init_one(call_virq, &irq_call);
286 smp_ipi_init_one(sched_virq, &irq_resched);
287 }
288
289 return 0;
290}
291
292int mips_smp_ipi_free(const struct cpumask *mask)
293{
294 struct irq_domain *ipidomain;
295 struct device_node *node;
296
297 node = of_irq_find_parent(of_root);
298 ipidomain = irq_find_matching_host(node, DOMAIN_BUS_IPI);
299
300
301
302
303
304
305 if (node && !ipidomain)
306 ipidomain = irq_find_matching_host(NULL, DOMAIN_BUS_IPI);
307
308 BUG_ON(!ipidomain);
309
310 if (irq_domain_is_ipi_per_cpu(ipidomain)) {
311 int cpu;
312
313 for_each_cpu(cpu, mask) {
314 remove_irq(call_virq + cpu, &irq_call);
315 remove_irq(sched_virq + cpu, &irq_resched);
316 }
317 }
318 irq_destroy_ipi(call_virq, mask);
319 irq_destroy_ipi(sched_virq, mask);
320 return 0;
321}
322
323
324static int __init mips_smp_ipi_init(void)
325{
326 if (num_possible_cpus() == 1)
327 return 0;
328
329 mips_smp_ipi_allocate(cpu_possible_mask);
330
331 call_desc = irq_to_desc(call_virq);
332 sched_desc = irq_to_desc(sched_virq);
333
334 return 0;
335}
336early_initcall(mips_smp_ipi_init);
337#endif
338
339
340
341
342
343asmlinkage void start_secondary(void)
344{
345 unsigned int cpu;
346
347 cpu_probe();
348 per_cpu_trap_init(false);
349 mips_clockevent_init();
350 mp_ops->init_secondary();
351 cpu_report();
352 maar_init();
353
354
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357
358
359 calibrate_delay();
360 preempt_disable();
361 cpu = smp_processor_id();
362 cpu_data[cpu].udelay_val = loops_per_jiffy;
363
364 cpumask_set_cpu(cpu, &cpu_coherent_mask);
365 notify_cpu_starting(cpu);
366
367
368 complete(&cpu_starting);
369
370 synchronise_count_slave(cpu);
371
372
373 set_cpu_online(cpu, true);
374
375 set_cpu_sibling_map(cpu);
376 set_cpu_core_map(cpu);
377
378 calculate_cpu_foreign_map();
379
380
381
382
383
384 complete(&cpu_running);
385
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387
388
389
390 WARN_ON_ONCE(!irqs_disabled());
391 mp_ops->smp_finish();
392
393 cpu_startup_entry(CPUHP_AP_ONLINE_IDLE);
394}
395
396static void stop_this_cpu(void *dummy)
397{
398
399
400
401
402 set_cpu_online(smp_processor_id(), false);
403 calculate_cpu_foreign_map();
404 local_irq_disable();
405 while (1);
406}
407
408void smp_send_stop(void)
409{
410 smp_call_function(stop_this_cpu, NULL, 0);
411}
412
413void __init smp_cpus_done(unsigned int max_cpus)
414{
415}
416
417
418void __init smp_prepare_cpus(unsigned int max_cpus)
419{
420 init_new_context(current, &init_mm);
421 current_thread_info()->cpu = 0;
422 mp_ops->prepare_cpus(max_cpus);
423 set_cpu_sibling_map(0);
424 set_cpu_core_map(0);
425 calculate_cpu_foreign_map();
426#ifndef CONFIG_HOTPLUG_CPU
427 init_cpu_present(cpu_possible_mask);
428#endif
429 cpumask_copy(&cpu_coherent_mask, cpu_possible_mask);
430}
431
432
433void smp_prepare_boot_cpu(void)
434{
435 if (mp_ops->prepare_boot_cpu)
436 mp_ops->prepare_boot_cpu();
437 set_cpu_possible(0, true);
438 set_cpu_online(0, true);
439}
440
441int __cpu_up(unsigned int cpu, struct task_struct *tidle)
442{
443 int err;
444
445 err = mp_ops->boot_secondary(cpu, tidle);
446 if (err)
447 return err;
448
449
450 if (!wait_for_completion_timeout(&cpu_starting,
451 msecs_to_jiffies(1000))) {
452 pr_crit("CPU%u: failed to start\n", cpu);
453 return -EIO;
454 }
455
456 synchronise_count_master(cpu);
457
458
459 wait_for_completion(&cpu_running);
460 return 0;
461}
462
463
464int setup_profiling_timer(unsigned int multiplier)
465{
466 return 0;
467}
468
469static void flush_tlb_all_ipi(void *info)
470{
471 local_flush_tlb_all();
472}
473
474void flush_tlb_all(void)
475{
476 if (cpu_has_mmid) {
477 htw_stop();
478 ginvt_full();
479 sync_ginv();
480 instruction_hazard();
481 htw_start();
482 return;
483 }
484
485 on_each_cpu(flush_tlb_all_ipi, NULL, 1);
486}
487
488static void flush_tlb_mm_ipi(void *mm)
489{
490 drop_mmu_context((struct mm_struct *)mm);
491}
492
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499
500
501static inline void smp_on_other_tlbs(void (*func) (void *info), void *info)
502{
503 smp_call_function(func, info, 1);
504}
505
506static inline void smp_on_each_tlb(void (*func) (void *info), void *info)
507{
508 preempt_disable();
509
510 smp_on_other_tlbs(func, info);
511 func(info);
512
513 preempt_enable();
514}
515
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518
519
520
521
522
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524
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526
527
528
529void flush_tlb_mm(struct mm_struct *mm)
530{
531 preempt_disable();
532
533 if (cpu_has_mmid) {
534
535
536
537
538 } else if ((atomic_read(&mm->mm_users) != 1) || (current->mm != mm)) {
539 smp_on_other_tlbs(flush_tlb_mm_ipi, mm);
540 } else {
541 unsigned int cpu;
542
543 for_each_online_cpu(cpu) {
544 if (cpu != smp_processor_id() && cpu_context(cpu, mm))
545 set_cpu_context(cpu, mm, 0);
546 }
547 }
548 drop_mmu_context(mm);
549
550 preempt_enable();
551}
552
553struct flush_tlb_data {
554 struct vm_area_struct *vma;
555 unsigned long addr1;
556 unsigned long addr2;
557};
558
559static void flush_tlb_range_ipi(void *info)
560{
561 struct flush_tlb_data *fd = info;
562
563 local_flush_tlb_range(fd->vma, fd->addr1, fd->addr2);
564}
565
566void flush_tlb_range(struct vm_area_struct *vma, unsigned long start, unsigned long end)
567{
568 struct mm_struct *mm = vma->vm_mm;
569 unsigned long addr;
570 u32 old_mmid;
571
572 preempt_disable();
573 if (cpu_has_mmid) {
574 htw_stop();
575 old_mmid = read_c0_memorymapid();
576 write_c0_memorymapid(cpu_asid(0, mm));
577 mtc0_tlbw_hazard();
578 addr = round_down(start, PAGE_SIZE * 2);
579 end = round_up(end, PAGE_SIZE * 2);
580 do {
581 ginvt_va_mmid(addr);
582 sync_ginv();
583 addr += PAGE_SIZE * 2;
584 } while (addr < end);
585 write_c0_memorymapid(old_mmid);
586 instruction_hazard();
587 htw_start();
588 } else if ((atomic_read(&mm->mm_users) != 1) || (current->mm != mm)) {
589 struct flush_tlb_data fd = {
590 .vma = vma,
591 .addr1 = start,
592 .addr2 = end,
593 };
594
595 smp_on_other_tlbs(flush_tlb_range_ipi, &fd);
596 local_flush_tlb_range(vma, start, end);
597 } else {
598 unsigned int cpu;
599 int exec = vma->vm_flags & VM_EXEC;
600
601 for_each_online_cpu(cpu) {
602
603
604
605
606
607
608 if (cpu != smp_processor_id() && cpu_context(cpu, mm))
609 set_cpu_context(cpu, mm, !exec);
610 }
611 local_flush_tlb_range(vma, start, end);
612 }
613 preempt_enable();
614}
615
616static void flush_tlb_kernel_range_ipi(void *info)
617{
618 struct flush_tlb_data *fd = info;
619
620 local_flush_tlb_kernel_range(fd->addr1, fd->addr2);
621}
622
623void flush_tlb_kernel_range(unsigned long start, unsigned long end)
624{
625 struct flush_tlb_data fd = {
626 .addr1 = start,
627 .addr2 = end,
628 };
629
630 on_each_cpu(flush_tlb_kernel_range_ipi, &fd, 1);
631}
632
633static void flush_tlb_page_ipi(void *info)
634{
635 struct flush_tlb_data *fd = info;
636
637 local_flush_tlb_page(fd->vma, fd->addr1);
638}
639
640void flush_tlb_page(struct vm_area_struct *vma, unsigned long page)
641{
642 u32 old_mmid;
643
644 preempt_disable();
645 if (cpu_has_mmid) {
646 htw_stop();
647 old_mmid = read_c0_memorymapid();
648 write_c0_memorymapid(cpu_asid(0, vma->vm_mm));
649 mtc0_tlbw_hazard();
650 ginvt_va_mmid(page);
651 sync_ginv();
652 write_c0_memorymapid(old_mmid);
653 instruction_hazard();
654 htw_start();
655 } else if ((atomic_read(&vma->vm_mm->mm_users) != 1) ||
656 (current->mm != vma->vm_mm)) {
657 struct flush_tlb_data fd = {
658 .vma = vma,
659 .addr1 = page,
660 };
661
662 smp_on_other_tlbs(flush_tlb_page_ipi, &fd);
663 local_flush_tlb_page(vma, page);
664 } else {
665 unsigned int cpu;
666
667 for_each_online_cpu(cpu) {
668
669
670
671
672
673
674 if (cpu != smp_processor_id() && cpu_context(cpu, vma->vm_mm))
675 set_cpu_context(cpu, vma->vm_mm, 1);
676 }
677 local_flush_tlb_page(vma, page);
678 }
679 preempt_enable();
680}
681
682static void flush_tlb_one_ipi(void *info)
683{
684 unsigned long vaddr = (unsigned long) info;
685
686 local_flush_tlb_one(vaddr);
687}
688
689void flush_tlb_one(unsigned long vaddr)
690{
691 smp_on_each_tlb(flush_tlb_one_ipi, (void *) vaddr);
692}
693
694EXPORT_SYMBOL(flush_tlb_page);
695EXPORT_SYMBOL(flush_tlb_one);
696
697#ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
698
699static DEFINE_PER_CPU(atomic_t, tick_broadcast_count);
700static DEFINE_PER_CPU(call_single_data_t, tick_broadcast_csd);
701
702void tick_broadcast(const struct cpumask *mask)
703{
704 atomic_t *count;
705 call_single_data_t *csd;
706 int cpu;
707
708 for_each_cpu(cpu, mask) {
709 count = &per_cpu(tick_broadcast_count, cpu);
710 csd = &per_cpu(tick_broadcast_csd, cpu);
711
712 if (atomic_inc_return(count) == 1)
713 smp_call_function_single_async(cpu, csd);
714 }
715}
716
717static void tick_broadcast_callee(void *info)
718{
719 int cpu = smp_processor_id();
720 tick_receive_broadcast();
721 atomic_set(&per_cpu(tick_broadcast_count, cpu), 0);
722}
723
724static int __init tick_broadcast_init(void)
725{
726 call_single_data_t *csd;
727 int cpu;
728
729 for (cpu = 0; cpu < NR_CPUS; cpu++) {
730 csd = &per_cpu(tick_broadcast_csd, cpu);
731 csd->func = tick_broadcast_callee;
732 }
733
734 return 0;
735}
736early_initcall(tick_broadcast_init);
737
738#endif
739