Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * linux/arch/alpha/kernel/irq.c | |
3 | * | |
4 | * Copyright (C) 1995 Linus Torvalds | |
5 | * | |
6 | * This file contains the code used by various IRQ handling routines: | |
7 | * asking for different IRQ's should be done through these routines | |
8 | * instead of just grabbing them. Thus setups with different IRQ numbers | |
9 | * shouldn't result in any weird surprises, and installing new handlers | |
10 | * should be easier. | |
11 | */ | |
12 | ||
13 | #include <linux/config.h> | |
14 | #include <linux/kernel.h> | |
15 | #include <linux/module.h> | |
16 | #include <linux/errno.h> | |
17 | #include <linux/kernel_stat.h> | |
18 | #include <linux/signal.h> | |
19 | #include <linux/sched.h> | |
20 | #include <linux/ptrace.h> | |
21 | #include <linux/interrupt.h> | |
22 | #include <linux/slab.h> | |
23 | #include <linux/random.h> | |
24 | #include <linux/init.h> | |
25 | #include <linux/irq.h> | |
26 | #include <linux/proc_fs.h> | |
27 | #include <linux/seq_file.h> | |
28 | #include <linux/profile.h> | |
29 | #include <linux/bitops.h> | |
30 | ||
31 | #include <asm/system.h> | |
32 | #include <asm/io.h> | |
33 | #include <asm/uaccess.h> | |
34 | ||
1da177e4 LT |
35 | volatile unsigned long irq_err_count; |
36 | ||
0595bf3b | 37 | void ack_bad_irq(unsigned int irq) |
1da177e4 LT |
38 | { |
39 | irq_err_count++; | |
40 | printk(KERN_CRIT "Unexpected IRQ trap at vector %u\n", irq); | |
41 | } | |
42 | ||
1da177e4 | 43 | #ifdef CONFIG_SMP |
1da177e4 | 44 | static char irq_user_affinity[NR_IRQS]; |
1da177e4 | 45 | |
0595bf3b IK |
46 | int |
47 | select_smp_affinity(unsigned int irq) | |
1da177e4 LT |
48 | { |
49 | static int last_cpu; | |
50 | int cpu = last_cpu + 1; | |
51 | ||
0595bf3b IK |
52 | if (!irq_desc[irq].handler->set_affinity || irq_user_affinity[irq]) |
53 | return 1; | |
1da177e4 LT |
54 | |
55 | while (!cpu_possible(cpu)) | |
56 | cpu = (cpu < (NR_CPUS-1) ? cpu + 1 : 0); | |
57 | last_cpu = cpu; | |
58 | ||
59 | irq_affinity[irq] = cpumask_of_cpu(cpu); | |
60 | irq_desc[irq].handler->set_affinity(irq, cpumask_of_cpu(cpu)); | |
0595bf3b | 61 | return 0; |
1da177e4 | 62 | } |
1da177e4 LT |
63 | #endif /* CONFIG_SMP */ |
64 | ||
1da177e4 LT |
65 | int |
66 | show_interrupts(struct seq_file *p, void *v) | |
67 | { | |
68 | #ifdef CONFIG_SMP | |
69 | int j; | |
70 | #endif | |
c5e3d98c | 71 | int irq = *(loff_t *) v; |
1da177e4 LT |
72 | struct irqaction * action; |
73 | unsigned long flags; | |
74 | ||
75 | #ifdef CONFIG_SMP | |
c5e3d98c | 76 | if (irq == 0) { |
1da177e4 | 77 | seq_puts(p, " "); |
c5e3d98c ES |
78 | for_each_online_cpu(j) |
79 | seq_printf(p, "CPU%d ", j); | |
1da177e4 LT |
80 | seq_putc(p, '\n'); |
81 | } | |
82 | #endif | |
83 | ||
c5e3d98c ES |
84 | if (irq < ACTUAL_NR_IRQS) { |
85 | spin_lock_irqsave(&irq_desc[irq].lock, flags); | |
86 | action = irq_desc[irq].action; | |
1da177e4 LT |
87 | if (!action) |
88 | goto unlock; | |
c5e3d98c | 89 | seq_printf(p, "%3d: ", irq); |
1da177e4 | 90 | #ifndef CONFIG_SMP |
c5e3d98c | 91 | seq_printf(p, "%10u ", kstat_irqs(irq)); |
1da177e4 | 92 | #else |
c5e3d98c ES |
93 | for_each_online_cpu(j) |
94 | seq_printf(p, "%10u ", kstat_cpu(j).irqs[irq]); | |
1da177e4 | 95 | #endif |
c5e3d98c | 96 | seq_printf(p, " %14s", irq_desc[irq].handler->typename); |
1da177e4 LT |
97 | seq_printf(p, " %c%s", |
98 | (action->flags & SA_INTERRUPT)?'+':' ', | |
99 | action->name); | |
100 | ||
101 | for (action=action->next; action; action = action->next) { | |
102 | seq_printf(p, ", %c%s", | |
103 | (action->flags & SA_INTERRUPT)?'+':' ', | |
104 | action->name); | |
105 | } | |
106 | ||
107 | seq_putc(p, '\n'); | |
108 | unlock: | |
c5e3d98c ES |
109 | spin_unlock_irqrestore(&irq_desc[irq].lock, flags); |
110 | } else if (irq == ACTUAL_NR_IRQS) { | |
1da177e4 LT |
111 | #ifdef CONFIG_SMP |
112 | seq_puts(p, "IPI: "); | |
c5e3d98c ES |
113 | for_each_online_cpu(j) |
114 | seq_printf(p, "%10lu ", cpu_data[j].ipi_count); | |
1da177e4 LT |
115 | seq_putc(p, '\n'); |
116 | #endif | |
117 | seq_printf(p, "ERR: %10lu\n", irq_err_count); | |
118 | } | |
119 | return 0; | |
120 | } | |
121 | ||
1da177e4 LT |
122 | /* |
123 | * handle_irq handles all normal device IRQ's (the special | |
124 | * SMP cross-CPU interrupts have their own specific | |
125 | * handlers). | |
126 | */ | |
127 | ||
128 | #define MAX_ILLEGAL_IRQS 16 | |
129 | ||
130 | void | |
131 | handle_irq(int irq, struct pt_regs * regs) | |
132 | { | |
133 | /* | |
134 | * We ack quickly, we don't want the irq controller | |
135 | * thinking we're snobs just because some other CPU has | |
136 | * disabled global interrupts (we have already done the | |
137 | * INT_ACK cycles, it's too late to try to pretend to the | |
138 | * controller that we aren't taking the interrupt). | |
139 | * | |
140 | * 0 return value means that this irq is already being | |
141 | * handled by some other CPU. (or is disabled) | |
142 | */ | |
1da177e4 LT |
143 | static unsigned int illegal_count=0; |
144 | ||
145 | if ((unsigned) irq > ACTUAL_NR_IRQS && illegal_count < MAX_ILLEGAL_IRQS ) { | |
146 | irq_err_count++; | |
147 | illegal_count++; | |
148 | printk(KERN_CRIT "device_interrupt: invalid interrupt %d\n", | |
149 | irq); | |
150 | return; | |
151 | } | |
152 | ||
153 | irq_enter(); | |
eff2c2f6 IK |
154 | /* |
155 | * __do_IRQ() must be called with IPL_MAX. Note that we do not | |
156 | * explicitly enable interrupts afterwards - some MILO PALcode | |
157 | * (namely LX164 one) seems to have severe problems with RTI | |
158 | * at IPL 0. | |
159 | */ | |
0595bf3b IK |
160 | local_irq_disable(); |
161 | __do_IRQ(irq, regs); | |
1da177e4 LT |
162 | irq_exit(); |
163 | } |