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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> | |
24 | ||
25 | #include <asm/atomic.h> | |
26 | #include <asm/system.h> | |
27 | #include <asm/uaccess.h> | |
28 | ||
4a4cf779 RB |
29 | static unsigned long irq_map[NR_IRQS / BITS_PER_LONG]; |
30 | ||
f543110d | 31 | int allocate_irqno(void) |
4a4cf779 RB |
32 | { |
33 | int irq; | |
34 | ||
35 | again: | |
36 | irq = find_first_zero_bit(irq_map, NR_IRQS); | |
37 | ||
38 | if (irq >= NR_IRQS) | |
39 | return -ENOSPC; | |
40 | ||
41 | if (test_and_set_bit(irq, irq_map)) | |
42 | goto again; | |
43 | ||
44 | return irq; | |
45 | } | |
46 | ||
47 | EXPORT_SYMBOL_GPL(allocate_irqno); | |
48 | ||
49 | /* | |
50 | * Allocate the 16 legacy interrupts for i8259 devices. This happens early | |
51 | * in the kernel initialization so treating allocation failure as BUG() is | |
52 | * ok. | |
53 | */ | |
54 | void __init alloc_legacy_irqno(void) | |
55 | { | |
56 | int i; | |
57 | ||
58 | for (i = 0; i <= 16; i++) | |
59 | BUG_ON(test_and_set_bit(i, irq_map)); | |
60 | } | |
61 | ||
f543110d | 62 | void free_irqno(unsigned int irq) |
4a4cf779 RB |
63 | { |
64 | smp_mb__before_clear_bit(); | |
65 | clear_bit(irq, irq_map); | |
66 | smp_mb__after_clear_bit(); | |
67 | } | |
68 | ||
69 | EXPORT_SYMBOL_GPL(free_irqno); | |
70 | ||
1da177e4 LT |
71 | /* |
72 | * 'what should we do if we get a hw irq event on an illegal vector'. | |
73 | * each architecture has to answer this themselves. | |
74 | */ | |
75 | void ack_bad_irq(unsigned int irq) | |
76 | { | |
1146fe30 | 77 | smtc_im_ack_irq(irq); |
1da177e4 LT |
78 | printk("unexpected IRQ # %d\n", irq); |
79 | } | |
80 | ||
81 | atomic_t irq_err_count; | |
82 | ||
1da177e4 LT |
83 | /* |
84 | * Generic, controller-independent functions: | |
85 | */ | |
86 | ||
87 | int show_interrupts(struct seq_file *p, void *v) | |
88 | { | |
89 | int i = *(loff_t *) v, j; | |
90 | struct irqaction * action; | |
91 | unsigned long flags; | |
92 | ||
93 | if (i == 0) { | |
94 | seq_printf(p, " "); | |
394e3902 | 95 | for_each_online_cpu(j) |
21a151d8 | 96 | seq_printf(p, "CPU%d ", j); |
1da177e4 LT |
97 | seq_putc(p, '\n'); |
98 | } | |
99 | ||
100 | if (i < NR_IRQS) { | |
101 | spin_lock_irqsave(&irq_desc[i].lock, flags); | |
102 | action = irq_desc[i].action; | |
42a3b4f2 | 103 | if (!action) |
1da177e4 | 104 | goto skip; |
21a151d8 | 105 | seq_printf(p, "%3d: ", i); |
1da177e4 LT |
106 | #ifndef CONFIG_SMP |
107 | seq_printf(p, "%10u ", kstat_irqs(i)); | |
108 | #else | |
394e3902 AM |
109 | for_each_online_cpu(j) |
110 | seq_printf(p, "%10u ", kstat_cpu(j).irqs[i]); | |
1da177e4 | 111 | #endif |
1ccd1c1c | 112 | seq_printf(p, " %14s", irq_desc[i].chip->name); |
1da177e4 LT |
113 | seq_printf(p, " %s", action->name); |
114 | ||
115 | for (action=action->next; action; action = action->next) | |
116 | seq_printf(p, ", %s", action->name); | |
117 | ||
118 | seq_putc(p, '\n'); | |
119 | skip: | |
120 | spin_unlock_irqrestore(&irq_desc[i].lock, flags); | |
121 | } else if (i == NR_IRQS) { | |
122 | seq_putc(p, '\n'); | |
123 | seq_printf(p, "ERR: %10u\n", atomic_read(&irq_err_count)); | |
124 | } | |
125 | return 0; | |
126 | } | |
127 | ||
937a8015 | 128 | asmlinkage void spurious_interrupt(void) |
93373ed4 RB |
129 | { |
130 | atomic_inc(&irq_err_count); | |
131 | } | |
132 | ||
1da177e4 LT |
133 | #ifdef CONFIG_KGDB |
134 | extern void breakpoint(void); | |
135 | extern void set_debug_traps(void); | |
136 | ||
137 | static int kgdb_flag = 1; | |
138 | static int __init nokgdb(char *str) | |
139 | { | |
140 | kgdb_flag = 0; | |
141 | return 1; | |
142 | } | |
143 | __setup("nokgdb", nokgdb); | |
144 | #endif | |
145 | ||
146 | void __init init_IRQ(void) | |
147 | { | |
24649c00 RB |
148 | int i; |
149 | ||
150 | for (i = 0; i < NR_IRQS; i++) | |
151 | set_irq_noprobe(i); | |
152 | ||
1da177e4 LT |
153 | arch_init_irq(); |
154 | ||
155 | #ifdef CONFIG_KGDB | |
156 | if (kgdb_flag) { | |
157 | printk("Wait for gdb client connection ...\n"); | |
158 | set_debug_traps(); | |
159 | breakpoint(); | |
160 | } | |
161 | #endif | |
162 | } |