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1da177e4 LT |
1 | /* |
2 | * linux/arch/arm/kernel/irq.c | |
3 | * | |
4 | * Copyright (C) 1992 Linus Torvalds | |
5 | * Modifications for ARM processor Copyright (C) 1995-2000 Russell King. | |
6 | * | |
8749af68 RK |
7 | * Support for Dynamic Tick Timer Copyright (C) 2004-2005 Nokia Corporation. |
8 | * Dynamic Tick Timer written by Tony Lindgren <tony@atomide.com> and | |
9 | * Tuukka Tikkanen <tuukka.tikkanen@elektrobit.com>. | |
10 | * | |
1da177e4 LT |
11 | * This program is free software; you can redistribute it and/or modify |
12 | * it under the terms of the GNU General Public License version 2 as | |
13 | * published by the Free Software Foundation. | |
14 | * | |
15 | * This file contains the code used by various IRQ handling routines: | |
16 | * asking for different IRQ's should be done through these routines | |
17 | * instead of just grabbing them. Thus setups with different IRQ numbers | |
18 | * shouldn't result in any weird surprises, and installing new handlers | |
19 | * should be easier. | |
20 | * | |
21 | * IRQ's are in fact implemented a bit like signal handlers for the kernel. | |
22 | * Naturally it's not a 1:1 relation, but there are similarities. | |
23 | */ | |
1da177e4 LT |
24 | #include <linux/kernel_stat.h> |
25 | #include <linux/module.h> | |
26 | #include <linux/signal.h> | |
27 | #include <linux/ioport.h> | |
28 | #include <linux/interrupt.h> | |
4a2581a0 | 29 | #include <linux/irq.h> |
1da177e4 LT |
30 | #include <linux/random.h> |
31 | #include <linux/smp.h> | |
32 | #include <linux/init.h> | |
33 | #include <linux/seq_file.h> | |
34 | #include <linux/errno.h> | |
35 | #include <linux/list.h> | |
36 | #include <linux/kallsyms.h> | |
37 | #include <linux/proc_fs.h> | |
61b5cb1c | 38 | #include <linux/ftrace.h> |
1da177e4 | 39 | |
1da177e4 | 40 | #include <asm/system.h> |
8ff1443c | 41 | #include <asm/mach/arch.h> |
897d8527 | 42 | #include <asm/mach/irq.h> |
8749af68 | 43 | #include <asm/mach/time.h> |
1da177e4 | 44 | |
1da177e4 LT |
45 | /* |
46 | * No architecture-specific irq_finish function defined in arm/arch/irqs.h. | |
47 | */ | |
48 | #ifndef irq_finish | |
49 | #define irq_finish(irq) do { } while (0) | |
50 | #endif | |
51 | ||
4a2581a0 | 52 | unsigned long irq_err_count; |
1da177e4 LT |
53 | |
54 | int show_interrupts(struct seq_file *p, void *v) | |
55 | { | |
56 | int i = *(loff_t *) v, cpu; | |
354e6f72 | 57 | struct irq_desc *desc; |
1da177e4 LT |
58 | struct irqaction * action; |
59 | unsigned long flags; | |
f13cd417 RK |
60 | int prec, n; |
61 | ||
62 | for (prec = 3, n = 1000; prec < 10 && n <= nr_irqs; prec++) | |
63 | n *= 10; | |
1da177e4 | 64 | |
4a88abd7 RK |
65 | #ifdef CONFIG_SMP |
66 | if (prec < 4) | |
67 | prec = 4; | |
68 | #endif | |
1da177e4 LT |
69 | |
70 | if (i == 0) { | |
71 | char cpuname[12]; | |
72 | ||
f13cd417 | 73 | seq_printf(p, "%*s ", prec, ""); |
1da177e4 LT |
74 | for_each_present_cpu(cpu) { |
75 | sprintf(cpuname, "CPU%d", cpu); | |
76 | seq_printf(p, " %10s", cpuname); | |
77 | } | |
78 | seq_putc(p, '\n'); | |
79 | } | |
80 | ||
354e6f72 | 81 | if (i < nr_irqs) { |
82 | desc = irq_to_desc(i); | |
83 | raw_spin_lock_irqsave(&desc->lock, flags); | |
84 | action = desc->action; | |
1da177e4 LT |
85 | if (!action) |
86 | goto unlock; | |
87 | ||
f13cd417 | 88 | seq_printf(p, "%*d: ", prec, i); |
1da177e4 | 89 | for_each_present_cpu(cpu) |
0b0f0b1c | 90 | seq_printf(p, "%10u ", kstat_irqs_cpu(i, cpu)); |
f64305a6 | 91 | seq_printf(p, " %10s", desc->irq_data.chip->name ? : "-"); |
1da177e4 LT |
92 | seq_printf(p, " %s", action->name); |
93 | for (action = action->next; action; action = action->next) | |
94 | seq_printf(p, ", %s", action->name); | |
95 | ||
96 | seq_putc(p, '\n'); | |
97 | unlock: | |
354e6f72 | 98 | raw_spin_unlock_irqrestore(&desc->lock, flags); |
99 | } else if (i == nr_irqs) { | |
baa28e35 | 100 | #ifdef CONFIG_FIQ |
f13cd417 | 101 | show_fiq_list(p, prec); |
1da177e4 LT |
102 | #endif |
103 | #ifdef CONFIG_SMP | |
f13cd417 | 104 | show_ipi_list(p, prec); |
ec405ea9 RK |
105 | #endif |
106 | #ifdef CONFIG_LOCAL_TIMERS | |
f13cd417 | 107 | show_local_irqs(p, prec); |
1da177e4 | 108 | #endif |
f13cd417 | 109 | seq_printf(p, "%*s: %10lu\n", prec, "Err", irq_err_count); |
1da177e4 LT |
110 | } |
111 | return 0; | |
112 | } | |
113 | ||
1da177e4 LT |
114 | /* |
115 | * do_IRQ handles all hardware IRQ's. Decoded IRQs should not | |
116 | * come via this function. Instead, they should provide their | |
117 | * own 'handler' | |
118 | */ | |
61b5cb1c RV |
119 | asmlinkage void __exception_irq_entry |
120 | asm_do_IRQ(unsigned int irq, struct pt_regs *regs) | |
1da177e4 | 121 | { |
e6300155 | 122 | struct pt_regs *old_regs = set_irq_regs(regs); |
d8aa0251 DES |
123 | |
124 | irq_enter(); | |
1da177e4 LT |
125 | |
126 | /* | |
127 | * Some hardware gives randomly wrong interrupts. Rather | |
128 | * than crashing, do something sensible. | |
129 | */ | |
354e6f72 | 130 | if (unlikely(irq >= nr_irqs)) { |
7aa5514e AK |
131 | if (printk_ratelimit()) |
132 | printk(KERN_WARNING "Bad IRQ%u\n", irq); | |
133 | ack_bad_irq(irq); | |
134 | } else { | |
d8aa0251 | 135 | generic_handle_irq(irq); |
7aa5514e | 136 | } |
1da177e4 | 137 | |
4a2581a0 | 138 | /* AT91 specific workaround */ |
1da177e4 LT |
139 | irq_finish(irq); |
140 | ||
1da177e4 | 141 | irq_exit(); |
e6300155 | 142 | set_irq_regs(old_regs); |
1da177e4 LT |
143 | } |
144 | ||
1da177e4 LT |
145 | void set_irq_flags(unsigned int irq, unsigned int iflags) |
146 | { | |
10dd5ce2 | 147 | struct irq_desc *desc; |
1da177e4 LT |
148 | unsigned long flags; |
149 | ||
354e6f72 | 150 | if (irq >= nr_irqs) { |
1da177e4 LT |
151 | printk(KERN_ERR "Trying to set irq flags for IRQ%d\n", irq); |
152 | return; | |
153 | } | |
154 | ||
354e6f72 | 155 | desc = irq_to_desc(irq); |
239007b8 | 156 | raw_spin_lock_irqsave(&desc->lock, flags); |
4a2581a0 TG |
157 | desc->status |= IRQ_NOREQUEST | IRQ_NOPROBE | IRQ_NOAUTOEN; |
158 | if (iflags & IRQF_VALID) | |
159 | desc->status &= ~IRQ_NOREQUEST; | |
160 | if (iflags & IRQF_PROBE) | |
161 | desc->status &= ~IRQ_NOPROBE; | |
162 | if (!(iflags & IRQF_NOAUTOEN)) | |
163 | desc->status &= ~IRQ_NOAUTOEN; | |
239007b8 | 164 | raw_spin_unlock_irqrestore(&desc->lock, flags); |
1da177e4 LT |
165 | } |
166 | ||
167 | void __init init_IRQ(void) | |
168 | { | |
8ff1443c | 169 | machine_desc->init_irq(); |
1da177e4 LT |
170 | } |
171 | ||
354e6f72 | 172 | #ifdef CONFIG_SPARSE_IRQ |
173 | int __init arch_probe_nr_irqs(void) | |
174 | { | |
8ff1443c | 175 | nr_irqs = machine_desc->nr_irqs ? machine_desc->nr_irqs : NR_IRQS; |
b683de2b | 176 | return nr_irqs; |
354e6f72 | 177 | } |
178 | #endif | |
179 | ||
a054a811 | 180 | #ifdef CONFIG_HOTPLUG_CPU |
f7ede370 | 181 | |
10dd5ce2 | 182 | static void route_irq(struct irq_desc *desc, unsigned int irq, unsigned int cpu) |
f7ede370 | 183 | { |
f64305a6 | 184 | pr_debug("IRQ%u: moving from cpu%u to cpu%u\n", irq, desc->irq_data.node, cpu); |
f7ede370 | 185 | |
239007b8 | 186 | raw_spin_lock_irq(&desc->lock); |
f64305a6 LB |
187 | desc->irq_data.chip->irq_set_affinity(&desc->irq_data, |
188 | cpumask_of(cpu), false); | |
239007b8 | 189 | raw_spin_unlock_irq(&desc->lock); |
f7ede370 TG |
190 | } |
191 | ||
a054a811 RK |
192 | /* |
193 | * The CPU has been marked offline. Migrate IRQs off this CPU. If | |
194 | * the affinity settings do not allow other CPUs, force them onto any | |
195 | * available CPU. | |
196 | */ | |
197 | void migrate_irqs(void) | |
198 | { | |
199 | unsigned int i, cpu = smp_processor_id(); | |
354e6f72 | 200 | struct irq_desc *desc; |
a054a811 | 201 | |
354e6f72 | 202 | for_each_irq_desc(i, desc) { |
f64305a6 LB |
203 | struct irq_data *d = &desc->irq_data; |
204 | ||
205 | if (d->node == cpu) { | |
206 | unsigned int newcpu = cpumask_any_and(d->affinity, | |
e65e49d0 MT |
207 | cpu_online_mask); |
208 | if (newcpu >= nr_cpu_ids) { | |
a054a811 RK |
209 | if (printk_ratelimit()) |
210 | printk(KERN_INFO "IRQ%u no longer affine to CPU%u\n", | |
211 | i, cpu); | |
212 | ||
f64305a6 LB |
213 | cpumask_setall(d->affinity); |
214 | newcpu = cpumask_any_and(d->affinity, | |
e65e49d0 | 215 | cpu_online_mask); |
a054a811 RK |
216 | } |
217 | ||
218 | route_irq(desc, i, newcpu); | |
219 | } | |
220 | } | |
221 | } | |
222 | #endif /* CONFIG_HOTPLUG_CPU */ |