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-rw-r--r--arch/powerpc/kernel/irq.c617
1 files changed, 3 insertions, 614 deletions
diff --git a/arch/powerpc/kernel/irq.c b/arch/powerpc/kernel/irq.c
index 01e2877e8e04..bdfb3eee3e6f 100644
--- a/arch/powerpc/kernel/irq.c
+++ b/arch/powerpc/kernel/irq.c
@@ -490,409 +490,19 @@ void do_softirq(void)
490 local_irq_restore(flags); 490 local_irq_restore(flags);
491} 491}
492 492
493
494/*
495 * IRQ controller and virtual interrupts
496 */
497
498/* The main irq map itself is an array of NR_IRQ entries containing the
499 * associate host and irq number. An entry with a host of NULL is free.
500 * An entry can be allocated if it's free, the allocator always then sets
501 * hwirq first to the host's invalid irq number and then fills ops.
502 */
503struct irq_map_entry {
504 irq_hw_number_t hwirq;
505 struct irq_host *host;
506};
507
508static LIST_HEAD(irq_hosts);
509static DEFINE_RAW_SPINLOCK(irq_big_lock);
510static DEFINE_MUTEX(revmap_trees_mutex);
511static struct irq_map_entry irq_map[NR_IRQS];
512static unsigned int irq_virq_count = NR_IRQS;
513static struct irq_host *irq_default_host;
514
515irq_hw_number_t irqd_to_hwirq(struct irq_data *d) 493irq_hw_number_t irqd_to_hwirq(struct irq_data *d)
516{ 494{
517 return irq_map[d->irq].hwirq; 495 return d->hwirq;
518} 496}
519EXPORT_SYMBOL_GPL(irqd_to_hwirq); 497EXPORT_SYMBOL_GPL(irqd_to_hwirq);
520 498
521irq_hw_number_t virq_to_hw(unsigned int virq) 499irq_hw_number_t virq_to_hw(unsigned int virq)
522{ 500{
523 return irq_map[virq].hwirq; 501 struct irq_data *irq_data = irq_get_irq_data(virq);
502 return WARN_ON(!irq_data) ? 0 : irq_data->hwirq;
524} 503}
525EXPORT_SYMBOL_GPL(virq_to_hw); 504EXPORT_SYMBOL_GPL(virq_to_hw);
526 505
527bool virq_is_host(unsigned int virq, struct irq_host *host)
528{
529 return irq_map[virq].host == host;
530}
531EXPORT_SYMBOL_GPL(virq_is_host);
532
533static int default_irq_host_match(struct irq_host *h, struct device_node *np)
534{
535 return h->of_node != NULL && h->of_node == np;
536}
537
538struct irq_host *irq_alloc_host(struct device_node *of_node,
539 unsigned int revmap_type,
540 unsigned int revmap_arg,
541 struct irq_host_ops *ops,
542 irq_hw_number_t inval_irq)
543{
544 struct irq_host *host;
545 unsigned int size = sizeof(struct irq_host);
546 unsigned int i;
547 unsigned int *rmap;
548 unsigned long flags;
549
550 /* Allocate structure and revmap table if using linear mapping */
551 if (revmap_type == IRQ_HOST_MAP_LINEAR)
552 size += revmap_arg * sizeof(unsigned int);
553 host = kzalloc(size, GFP_KERNEL);
554 if (host == NULL)
555 return NULL;
556
557 /* Fill structure */
558 host->revmap_type = revmap_type;
559 host->inval_irq = inval_irq;
560 host->ops = ops;
561 host->of_node = of_node_get(of_node);
562
563 if (host->ops->match == NULL)
564 host->ops->match = default_irq_host_match;
565
566 raw_spin_lock_irqsave(&irq_big_lock, flags);
567
568 /* If it's a legacy controller, check for duplicates and
569 * mark it as allocated (we use irq 0 host pointer for that
570 */
571 if (revmap_type == IRQ_HOST_MAP_LEGACY) {
572 if (irq_map[0].host != NULL) {
573 raw_spin_unlock_irqrestore(&irq_big_lock, flags);
574 of_node_put(host->of_node);
575 kfree(host);
576 return NULL;
577 }
578 irq_map[0].host = host;
579 }
580
581 list_add(&host->link, &irq_hosts);
582 raw_spin_unlock_irqrestore(&irq_big_lock, flags);
583
584 /* Additional setups per revmap type */
585 switch(revmap_type) {
586 case IRQ_HOST_MAP_LEGACY:
587 /* 0 is always the invalid number for legacy */
588 host->inval_irq = 0;
589 /* setup us as the host for all legacy interrupts */
590 for (i = 1; i < NUM_ISA_INTERRUPTS; i++) {
591 irq_map[i].hwirq = i;
592 smp_wmb();
593 irq_map[i].host = host;
594 smp_wmb();
595
596 /* Legacy flags are left to default at this point,
597 * one can then use irq_create_mapping() to
598 * explicitly change them
599 */
600 ops->map(host, i, i);
601
602 /* Clear norequest flags */
603 irq_clear_status_flags(i, IRQ_NOREQUEST);
604 }
605 break;
606 case IRQ_HOST_MAP_LINEAR:
607 rmap = (unsigned int *)(host + 1);
608 for (i = 0; i < revmap_arg; i++)
609 rmap[i] = NO_IRQ;
610 host->revmap_data.linear.size = revmap_arg;
611 smp_wmb();
612 host->revmap_data.linear.revmap = rmap;
613 break;
614 case IRQ_HOST_MAP_TREE:
615 INIT_RADIX_TREE(&host->revmap_data.tree, GFP_KERNEL);
616 break;
617 default:
618 break;
619 }
620
621 pr_debug("irq: Allocated host of type %d @0x%p\n", revmap_type, host);
622
623 return host;
624}
625
626struct irq_host *irq_find_host(struct device_node *node)
627{
628 struct irq_host *h, *found = NULL;
629 unsigned long flags;
630
631 /* We might want to match the legacy controller last since
632 * it might potentially be set to match all interrupts in
633 * the absence of a device node. This isn't a problem so far
634 * yet though...
635 */
636 raw_spin_lock_irqsave(&irq_big_lock, flags);
637 list_for_each_entry(h, &irq_hosts, link)
638 if (h->ops->match(h, node)) {
639 found = h;
640 break;
641 }
642 raw_spin_unlock_irqrestore(&irq_big_lock, flags);
643 return found;
644}
645EXPORT_SYMBOL_GPL(irq_find_host);
646
647void irq_set_default_host(struct irq_host *host)
648{
649 pr_debug("irq: Default host set to @0x%p\n", host);
650
651 irq_default_host = host;
652}
653
654void irq_set_virq_count(unsigned int count)
655{
656 pr_debug("irq: Trying to set virq count to %d\n", count);
657
658 BUG_ON(count < NUM_ISA_INTERRUPTS);
659 if (count < NR_IRQS)
660 irq_virq_count = count;
661}
662
663static int irq_setup_virq(struct irq_host *host, unsigned int virq,
664 irq_hw_number_t hwirq)
665{
666 int res;
667
668 res = irq_alloc_desc_at(virq, 0);
669 if (res != virq) {
670 pr_debug("irq: -> allocating desc failed\n");
671 goto error;
672 }
673
674 /* map it */
675 smp_wmb();
676 irq_map[virq].hwirq = hwirq;
677 smp_mb();
678
679 if (host->ops->map(host, virq, hwirq)) {
680 pr_debug("irq: -> mapping failed, freeing\n");
681 goto errdesc;
682 }
683
684 irq_clear_status_flags(virq, IRQ_NOREQUEST);
685
686 return 0;
687
688errdesc:
689 irq_free_descs(virq, 1);
690error:
691 irq_free_virt(virq, 1);
692 return -1;
693}
694
695unsigned int irq_create_direct_mapping(struct irq_host *host)
696{
697 unsigned int virq;
698
699 if (host == NULL)
700 host = irq_default_host;
701
702 BUG_ON(host == NULL);
703 WARN_ON(host->revmap_type != IRQ_HOST_MAP_NOMAP);
704
705 virq = irq_alloc_virt(host, 1, 0);
706 if (virq == NO_IRQ) {
707 pr_debug("irq: create_direct virq allocation failed\n");
708 return NO_IRQ;
709 }
710
711 pr_debug("irq: create_direct obtained virq %d\n", virq);
712
713 if (irq_setup_virq(host, virq, virq))
714 return NO_IRQ;
715
716 return virq;
717}
718
719unsigned int irq_create_mapping(struct irq_host *host,
720 irq_hw_number_t hwirq)
721{
722 unsigned int virq, hint;
723
724 pr_debug("irq: irq_create_mapping(0x%p, 0x%lx)\n", host, hwirq);
725
726 /* Look for default host if nececssary */
727 if (host == NULL)
728 host = irq_default_host;
729 if (host == NULL) {
730 printk(KERN_WARNING "irq_create_mapping called for"
731 " NULL host, hwirq=%lx\n", hwirq);
732 WARN_ON(1);
733 return NO_IRQ;
734 }
735 pr_debug("irq: -> using host @%p\n", host);
736
737 /* Check if mapping already exists */
738 virq = irq_find_mapping(host, hwirq);
739 if (virq != NO_IRQ) {
740 pr_debug("irq: -> existing mapping on virq %d\n", virq);
741 return virq;
742 }
743
744 /* Get a virtual interrupt number */
745 if (host->revmap_type == IRQ_HOST_MAP_LEGACY) {
746 /* Handle legacy */
747 virq = (unsigned int)hwirq;
748 if (virq == 0 || virq >= NUM_ISA_INTERRUPTS)
749 return NO_IRQ;
750 return virq;
751 } else {
752 /* Allocate a virtual interrupt number */
753 hint = hwirq % irq_virq_count;
754 virq = irq_alloc_virt(host, 1, hint);
755 if (virq == NO_IRQ) {
756 pr_debug("irq: -> virq allocation failed\n");
757 return NO_IRQ;
758 }
759 }
760
761 if (irq_setup_virq(host, virq, hwirq))
762 return NO_IRQ;
763
764 pr_debug("irq: irq %lu on host %s mapped to virtual irq %u\n",
765 hwirq, host->of_node ? host->of_node->full_name : "null", virq);
766
767 return virq;
768}
769EXPORT_SYMBOL_GPL(irq_create_mapping);
770
771unsigned int irq_create_of_mapping(struct device_node *controller,
772 const u32 *intspec, unsigned int intsize)
773{
774 struct irq_host *host;
775 irq_hw_number_t hwirq;
776 unsigned int type = IRQ_TYPE_NONE;
777 unsigned int virq;
778
779 if (controller == NULL)
780 host = irq_default_host;
781 else
782 host = irq_find_host(controller);
783 if (host == NULL) {
784 printk(KERN_WARNING "irq: no irq host found for %s !\n",
785 controller->full_name);
786 return NO_IRQ;
787 }
788
789 /* If host has no translation, then we assume interrupt line */
790 if (host->ops->xlate == NULL)
791 hwirq = intspec[0];
792 else {
793 if (host->ops->xlate(host, controller, intspec, intsize,
794 &hwirq, &type))
795 return NO_IRQ;
796 }
797
798 /* Create mapping */
799 virq = irq_create_mapping(host, hwirq);
800 if (virq == NO_IRQ)
801 return virq;
802
803 /* Set type if specified and different than the current one */
804 if (type != IRQ_TYPE_NONE &&
805 type != (irqd_get_trigger_type(irq_get_irq_data(virq))))
806 irq_set_irq_type(virq, type);
807 return virq;
808}
809EXPORT_SYMBOL_GPL(irq_create_of_mapping);
810
811void irq_dispose_mapping(unsigned int virq)
812{
813 struct irq_host *host;
814 irq_hw_number_t hwirq;
815
816 if (virq == NO_IRQ)
817 return;
818
819 host = irq_map[virq].host;
820 if (WARN_ON(host == NULL))
821 return;
822
823 /* Never unmap legacy interrupts */
824 if (host->revmap_type == IRQ_HOST_MAP_LEGACY)
825 return;
826
827 irq_set_status_flags(virq, IRQ_NOREQUEST);
828
829 /* remove chip and handler */
830 irq_set_chip_and_handler(virq, NULL, NULL);
831
832 /* Make sure it's completed */
833 synchronize_irq(virq);
834
835 /* Tell the PIC about it */
836 if (host->ops->unmap)
837 host->ops->unmap(host, virq);
838 smp_mb();
839
840 /* Clear reverse map */
841 hwirq = irq_map[virq].hwirq;
842 switch(host->revmap_type) {
843 case IRQ_HOST_MAP_LINEAR:
844 if (hwirq < host->revmap_data.linear.size)
845 host->revmap_data.linear.revmap[hwirq] = NO_IRQ;
846 break;
847 case IRQ_HOST_MAP_TREE:
848 mutex_lock(&revmap_trees_mutex);
849 radix_tree_delete(&host->revmap_data.tree, hwirq);
850 mutex_unlock(&revmap_trees_mutex);
851 break;
852 }
853
854 /* Destroy map */
855 smp_mb();
856 irq_map[virq].hwirq = host->inval_irq;
857
858 irq_free_descs(virq, 1);
859 /* Free it */
860 irq_free_virt(virq, 1);
861}
862EXPORT_SYMBOL_GPL(irq_dispose_mapping);
863
864unsigned int irq_find_mapping(struct irq_host *host,
865 irq_hw_number_t hwirq)
866{
867 unsigned int i;
868 unsigned int hint = hwirq % irq_virq_count;
869
870 /* Look for default host if nececssary */
871 if (host == NULL)
872 host = irq_default_host;
873 if (host == NULL)
874 return NO_IRQ;
875
876 /* legacy -> bail early */
877 if (host->revmap_type == IRQ_HOST_MAP_LEGACY)
878 return hwirq;
879
880 /* Slow path does a linear search of the map */
881 if (hint < NUM_ISA_INTERRUPTS)
882 hint = NUM_ISA_INTERRUPTS;
883 i = hint;
884 do {
885 if (irq_map[i].host == host &&
886 irq_map[i].hwirq == hwirq)
887 return i;
888 i++;
889 if (i >= irq_virq_count)
890 i = NUM_ISA_INTERRUPTS;
891 } while(i != hint);
892 return NO_IRQ;
893}
894EXPORT_SYMBOL_GPL(irq_find_mapping);
895
896#ifdef CONFIG_SMP 506#ifdef CONFIG_SMP
897int irq_choose_cpu(const struct cpumask *mask) 507int irq_choose_cpu(const struct cpumask *mask)
898{ 508{
@@ -929,232 +539,11 @@ int irq_choose_cpu(const struct cpumask *mask)
929} 539}
930#endif 540#endif
931 541
932unsigned int irq_radix_revmap_lookup(struct irq_host *host,
933 irq_hw_number_t hwirq)
934{
935 struct irq_map_entry *ptr;
936 unsigned int virq;
937
938 if (WARN_ON_ONCE(host->revmap_type != IRQ_HOST_MAP_TREE))
939 return irq_find_mapping(host, hwirq);
940
941 /*
942 * The ptr returned references the static global irq_map.
943 * but freeing an irq can delete nodes along the path to
944 * do the lookup via call_rcu.
945 */
946 rcu_read_lock();
947 ptr = radix_tree_lookup(&host->revmap_data.tree, hwirq);
948 rcu_read_unlock();
949
950 /*
951 * If found in radix tree, then fine.
952 * Else fallback to linear lookup - this should not happen in practice
953 * as it means that we failed to insert the node in the radix tree.
954 */
955 if (ptr)
956 virq = ptr - irq_map;
957 else
958 virq = irq_find_mapping(host, hwirq);
959
960 return virq;
961}
962
963void irq_radix_revmap_insert(struct irq_host *host, unsigned int virq,
964 irq_hw_number_t hwirq)
965{
966 if (WARN_ON(host->revmap_type != IRQ_HOST_MAP_TREE))
967 return;
968
969 if (virq != NO_IRQ) {
970 mutex_lock(&revmap_trees_mutex);
971 radix_tree_insert(&host->revmap_data.tree, hwirq,
972 &irq_map[virq]);
973 mutex_unlock(&revmap_trees_mutex);
974 }
975}
976
977unsigned int irq_linear_revmap(struct irq_host *host,
978 irq_hw_number_t hwirq)
979{
980 unsigned int *revmap;
981
982 if (WARN_ON_ONCE(host->revmap_type != IRQ_HOST_MAP_LINEAR))
983 return irq_find_mapping(host, hwirq);
984
985 /* Check revmap bounds */
986 if (unlikely(hwirq >= host->revmap_data.linear.size))
987 return irq_find_mapping(host, hwirq);
988
989 /* Check if revmap was allocated */
990 revmap = host->revmap_data.linear.revmap;
991 if (unlikely(revmap == NULL))
992 return irq_find_mapping(host, hwirq);
993
994 /* Fill up revmap with slow path if no mapping found */
995 if (unlikely(revmap[hwirq] == NO_IRQ))
996 revmap[hwirq] = irq_find_mapping(host, hwirq);
997
998 return revmap[hwirq];
999}
1000
1001unsigned int irq_alloc_virt(struct irq_host *host,
1002 unsigned int count,
1003 unsigned int hint)
1004{
1005 unsigned long flags;
1006 unsigned int i, j, found = NO_IRQ;
1007
1008 if (count == 0 || count > (irq_virq_count - NUM_ISA_INTERRUPTS))
1009 return NO_IRQ;
1010
1011 raw_spin_lock_irqsave(&irq_big_lock, flags);
1012
1013 /* Use hint for 1 interrupt if any */
1014 if (count == 1 && hint >= NUM_ISA_INTERRUPTS &&
1015 hint < irq_virq_count && irq_map[hint].host == NULL) {
1016 found = hint;
1017 goto hint_found;
1018 }
1019
1020 /* Look for count consecutive numbers in the allocatable
1021 * (non-legacy) space
1022 */
1023 for (i = NUM_ISA_INTERRUPTS, j = 0; i < irq_virq_count; i++) {
1024 if (irq_map[i].host != NULL)
1025 j = 0;
1026 else
1027 j++;
1028
1029 if (j == count) {
1030 found = i - count + 1;
1031 break;
1032 }
1033 }
1034 if (found == NO_IRQ) {
1035 raw_spin_unlock_irqrestore(&irq_big_lock, flags);
1036 return NO_IRQ;
1037 }
1038 hint_found:
1039 for (i = found; i < (found + count); i++) {
1040 irq_map[i].hwirq = host->inval_irq;
1041 smp_wmb();
1042 irq_map[i].host = host;
1043 }
1044 raw_spin_unlock_irqrestore(&irq_big_lock, flags);
1045 return found;
1046}
1047
1048void irq_free_virt(unsigned int virq, unsigned int count)
1049{
1050 unsigned long flags;
1051 unsigned int i;
1052
1053 WARN_ON (virq < NUM_ISA_INTERRUPTS);
1054 WARN_ON (count == 0 || (virq + count) > irq_virq_count);
1055
1056 if (virq < NUM_ISA_INTERRUPTS) {
1057 if (virq + count < NUM_ISA_INTERRUPTS)
1058 return;
1059 count =- NUM_ISA_INTERRUPTS - virq;
1060 virq = NUM_ISA_INTERRUPTS;
1061 }
1062
1063 if (count > irq_virq_count || virq > irq_virq_count - count) {
1064 if (virq > irq_virq_count)
1065 return;
1066 count = irq_virq_count - virq;
1067 }
1068
1069 raw_spin_lock_irqsave(&irq_big_lock, flags);
1070 for (i = virq; i < (virq + count); i++) {
1071 struct irq_host *host;
1072
1073 host = irq_map[i].host;
1074 irq_map[i].hwirq = host->inval_irq;
1075 smp_wmb();
1076 irq_map[i].host = NULL;
1077 }
1078 raw_spin_unlock_irqrestore(&irq_big_lock, flags);
1079}
1080
1081int arch_early_irq_init(void) 542int arch_early_irq_init(void)
1082{ 543{
1083 return 0; 544 return 0;
1084} 545}
1085 546
1086#ifdef CONFIG_VIRQ_DEBUG
1087static int virq_debug_show(struct seq_file *m, void *private)
1088{
1089 unsigned long flags;
1090 struct irq_desc *desc;
1091 const char *p;
1092 static const char none[] = "none";
1093 void *data;
1094 int i;
1095
1096 seq_printf(m, "%-5s %-7s %-15s %-18s %s\n", "virq", "hwirq",
1097 "chip name", "chip data", "host name");
1098
1099 for (i = 1; i < nr_irqs; i++) {
1100 desc = irq_to_desc(i);
1101 if (!desc)
1102 continue;
1103
1104 raw_spin_lock_irqsave(&desc->lock, flags);
1105
1106 if (desc->action && desc->action->handler) {
1107 struct irq_chip *chip;
1108
1109 seq_printf(m, "%5d ", i);
1110 seq_printf(m, "0x%05lx ", irq_map[i].hwirq);
1111
1112 chip = irq_desc_get_chip(desc);
1113 if (chip && chip->name)
1114 p = chip->name;
1115 else
1116 p = none;
1117 seq_printf(m, "%-15s ", p);
1118
1119 data = irq_desc_get_chip_data(desc);
1120 seq_printf(m, "0x%16p ", data);
1121
1122 if (irq_map[i].host && irq_map[i].host->of_node)
1123 p = irq_map[i].host->of_node->full_name;
1124 else
1125 p = none;
1126 seq_printf(m, "%s\n", p);
1127 }
1128
1129 raw_spin_unlock_irqrestore(&desc->lock, flags);
1130 }
1131
1132 return 0;
1133}
1134
1135static int virq_debug_open(struct inode *inode, struct file *file)
1136{
1137 return single_open(file, virq_debug_show, inode->i_private);
1138}
1139
1140static const struct file_operations virq_debug_fops = {
1141 .open = virq_debug_open,
1142 .read = seq_read,
1143 .llseek = seq_lseek,
1144 .release = single_release,
1145};
1146
1147static int __init irq_debugfs_init(void)
1148{
1149 if (debugfs_create_file("virq_mapping", S_IRUGO, powerpc_debugfs_root,
1150 NULL, &virq_debug_fops) == NULL)
1151 return -ENOMEM;
1152
1153 return 0;
1154}
1155__initcall(irq_debugfs_init);
1156#endif /* CONFIG_VIRQ_DEBUG */
1157
1158#ifdef CONFIG_PPC64 547#ifdef CONFIG_PPC64
1159static int __init setup_noirqdistrib(char *str) 548static int __init setup_noirqdistrib(char *str)
1160{ 549{
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