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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * This file is subject to the terms and conditions of the GNU General Public | |
3 | * License. See the file "COPYING" in the main directory of this archive | |
4 | * for more details. | |
5 | * | |
6 | * Code to handle x86 style IRQs plus some generic interrupt stuff. | |
7 | * | |
8 | * Copyright (C) 1992 Linus Torvalds | |
9 | * Copyright (C) 1994 - 2000 Ralf Baechle | |
10 | */ | |
1da177e4 LT |
11 | #include <linux/kernel.h> |
12 | #include <linux/delay.h> | |
13 | #include <linux/init.h> | |
14 | #include <linux/interrupt.h> | |
15 | #include <linux/kernel_stat.h> | |
16 | #include <linux/module.h> | |
17 | #include <linux/proc_fs.h> | |
18 | #include <linux/slab.h> | |
19 | #include <linux/mm.h> | |
20 | #include <linux/random.h> | |
21 | #include <linux/sched.h> | |
22 | #include <linux/seq_file.h> | |
23 | #include <linux/kallsyms.h> | |
88547001 | 24 | #include <linux/kgdb.h> |
8f99a162 | 25 | #include <linux/ftrace.h> |
1da177e4 LT |
26 | |
27 | #include <asm/atomic.h> | |
28 | #include <asm/system.h> | |
29 | #include <asm/uaccess.h> | |
30 | ||
88547001 JW |
31 | #ifdef CONFIG_KGDB |
32 | int kgdb_early_setup; | |
33 | #endif | |
34 | ||
4a4cf779 RB |
35 | static unsigned long irq_map[NR_IRQS / BITS_PER_LONG]; |
36 | ||
f543110d | 37 | int allocate_irqno(void) |
4a4cf779 RB |
38 | { |
39 | int irq; | |
40 | ||
41 | again: | |
42 | irq = find_first_zero_bit(irq_map, NR_IRQS); | |
43 | ||
44 | if (irq >= NR_IRQS) | |
45 | return -ENOSPC; | |
46 | ||
47 | if (test_and_set_bit(irq, irq_map)) | |
48 | goto again; | |
49 | ||
50 | return irq; | |
51 | } | |
52 | ||
4a4cf779 RB |
53 | /* |
54 | * Allocate the 16 legacy interrupts for i8259 devices. This happens early | |
55 | * in the kernel initialization so treating allocation failure as BUG() is | |
56 | * ok. | |
57 | */ | |
58 | void __init alloc_legacy_irqno(void) | |
59 | { | |
60 | int i; | |
61 | ||
62 | for (i = 0; i <= 16; i++) | |
63 | BUG_ON(test_and_set_bit(i, irq_map)); | |
64 | } | |
65 | ||
f543110d | 66 | void free_irqno(unsigned int irq) |
4a4cf779 RB |
67 | { |
68 | smp_mb__before_clear_bit(); | |
69 | clear_bit(irq, irq_map); | |
70 | smp_mb__after_clear_bit(); | |
71 | } | |
72 | ||
1da177e4 LT |
73 | /* |
74 | * 'what should we do if we get a hw irq event on an illegal vector'. | |
75 | * each architecture has to answer this themselves. | |
76 | */ | |
77 | void ack_bad_irq(unsigned int irq) | |
78 | { | |
1146fe30 | 79 | smtc_im_ack_irq(irq); |
1da177e4 LT |
80 | printk("unexpected IRQ # %d\n", irq); |
81 | } | |
82 | ||
83 | atomic_t irq_err_count; | |
84 | ||
1da177e4 LT |
85 | /* |
86 | * Generic, controller-independent functions: | |
87 | */ | |
88 | ||
89 | int show_interrupts(struct seq_file *p, void *v) | |
90 | { | |
91 | int i = *(loff_t *) v, j; | |
92 | struct irqaction * action; | |
93 | unsigned long flags; | |
94 | ||
95 | if (i == 0) { | |
96 | seq_printf(p, " "); | |
394e3902 | 97 | for_each_online_cpu(j) |
21a151d8 | 98 | seq_printf(p, "CPU%d ", j); |
1da177e4 LT |
99 | seq_putc(p, '\n'); |
100 | } | |
101 | ||
102 | if (i < NR_IRQS) { | |
239007b8 | 103 | raw_spin_lock_irqsave(&irq_desc[i].lock, flags); |
1da177e4 | 104 | action = irq_desc[i].action; |
42a3b4f2 | 105 | if (!action) |
1da177e4 | 106 | goto skip; |
21a151d8 | 107 | seq_printf(p, "%3d: ", i); |
1da177e4 LT |
108 | #ifndef CONFIG_SMP |
109 | seq_printf(p, "%10u ", kstat_irqs(i)); | |
110 | #else | |
394e3902 | 111 | for_each_online_cpu(j) |
0b0f0b1c | 112 | seq_printf(p, "%10u ", kstat_irqs_cpu(i, j)); |
1da177e4 | 113 | #endif |
1ccd1c1c | 114 | seq_printf(p, " %14s", irq_desc[i].chip->name); |
1da177e4 LT |
115 | seq_printf(p, " %s", action->name); |
116 | ||
117 | for (action=action->next; action; action = action->next) | |
118 | seq_printf(p, ", %s", action->name); | |
119 | ||
120 | seq_putc(p, '\n'); | |
121 | skip: | |
239007b8 | 122 | raw_spin_unlock_irqrestore(&irq_desc[i].lock, flags); |
1da177e4 LT |
123 | } else if (i == NR_IRQS) { |
124 | seq_putc(p, '\n'); | |
125 | seq_printf(p, "ERR: %10u\n", atomic_read(&irq_err_count)); | |
126 | } | |
127 | return 0; | |
128 | } | |
129 | ||
937a8015 | 130 | asmlinkage void spurious_interrupt(void) |
93373ed4 RB |
131 | { |
132 | atomic_inc(&irq_err_count); | |
133 | } | |
134 | ||
1da177e4 LT |
135 | void __init init_IRQ(void) |
136 | { | |
24649c00 RB |
137 | int i; |
138 | ||
88547001 JW |
139 | #ifdef CONFIG_KGDB |
140 | if (kgdb_early_setup) | |
141 | return; | |
142 | #endif | |
143 | ||
24649c00 RB |
144 | for (i = 0; i < NR_IRQS; i++) |
145 | set_irq_noprobe(i); | |
146 | ||
1da177e4 | 147 | arch_init_irq(); |
88547001 JW |
148 | |
149 | #ifdef CONFIG_KGDB | |
150 | if (!kgdb_early_setup) | |
151 | kgdb_early_setup = 1; | |
152 | #endif | |
1da177e4 | 153 | } |
8f99a162 WZ |
154 | |
155 | /* | |
156 | * do_IRQ handles all normal device IRQ's (the special | |
157 | * SMP cross-CPU interrupts have their own specific | |
158 | * handlers). | |
159 | */ | |
160 | void __irq_entry do_IRQ(unsigned int irq) | |
161 | { | |
162 | irq_enter(); | |
163 | __DO_IRQ_SMTC_HOOK(irq); | |
164 | generic_handle_irq(irq); | |
165 | irq_exit(); | |
166 | } | |
167 | ||
168 | #ifdef CONFIG_MIPS_MT_SMTC_IRQAFF | |
169 | /* | |
170 | * To avoid inefficient and in some cases pathological re-checking of | |
171 | * IRQ affinity, we have this variant that skips the affinity check. | |
172 | */ | |
173 | ||
174 | void __irq_entry do_IRQ_no_affinity(unsigned int irq) | |
175 | { | |
176 | irq_enter(); | |
177 | __NO_AFFINITY_IRQ_SMTC_HOOK(irq); | |
178 | generic_handle_irq(irq); | |
179 | irq_exit(); | |
180 | } | |
181 | ||
182 | #endif /* CONFIG_MIPS_MT_SMTC_IRQAFF */ |