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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 | ||
1da177e4 LT |
13 | #include <linux/kernel.h> |
14 | #include <linux/module.h> | |
15 | #include <linux/errno.h> | |
16 | #include <linux/kernel_stat.h> | |
17 | #include <linux/signal.h> | |
18 | #include <linux/sched.h> | |
19 | #include <linux/ptrace.h> | |
20 | #include <linux/interrupt.h> | |
1da177e4 | 21 | #include <linux/random.h> |
1da177e4 LT |
22 | #include <linux/irq.h> |
23 | #include <linux/proc_fs.h> | |
24 | #include <linux/seq_file.h> | |
25 | #include <linux/profile.h> | |
26 | #include <linux/bitops.h> | |
27 | ||
1da177e4 LT |
28 | #include <asm/io.h> |
29 | #include <asm/uaccess.h> | |
30 | ||
1da177e4 | 31 | volatile unsigned long irq_err_count; |
65d92064 | 32 | DEFINE_PER_CPU(unsigned long, irq_pmi_count); |
1da177e4 | 33 | |
0595bf3b | 34 | void ack_bad_irq(unsigned int irq) |
1da177e4 LT |
35 | { |
36 | irq_err_count++; | |
37 | printk(KERN_CRIT "Unexpected IRQ trap at vector %u\n", irq); | |
38 | } | |
39 | ||
1da177e4 | 40 | #ifdef CONFIG_SMP |
1da177e4 | 41 | static char irq_user_affinity[NR_IRQS]; |
1da177e4 | 42 | |
18404756 | 43 | int irq_select_affinity(unsigned int irq) |
1da177e4 | 44 | { |
0b534cf3 TG |
45 | struct irq_data *data = irq_get_irq_data(irq); |
46 | struct irq_chip *chip; | |
1da177e4 LT |
47 | static int last_cpu; |
48 | int cpu = last_cpu + 1; | |
49 | ||
0b534cf3 TG |
50 | if (!data) |
51 | return 1; | |
52 | chip = irq_data_get_irq_chip(data); | |
53 | ||
54 | if (!chip->irq_set_affinity || irq_user_affinity[irq]) | |
0595bf3b | 55 | return 1; |
1da177e4 | 56 | |
d036e67b RR |
57 | while (!cpu_possible(cpu) || |
58 | !cpumask_test_cpu(cpu, irq_default_affinity)) | |
1da177e4 LT |
59 | cpu = (cpu < (NR_CPUS-1) ? cpu + 1 : 0); |
60 | last_cpu = cpu; | |
61 | ||
95e432b9 | 62 | cpumask_copy(irq_data_get_affinity_mask(data), cpumask_of(cpu)); |
0b534cf3 | 63 | chip->irq_set_affinity(data, cpumask_of(cpu), false); |
0595bf3b | 64 | return 0; |
1da177e4 | 65 | } |
1da177e4 LT |
66 | #endif /* CONFIG_SMP */ |
67 | ||
a6e120ed | 68 | int arch_show_interrupts(struct seq_file *p, int prec) |
1da177e4 | 69 | { |
1da177e4 | 70 | int j; |
1da177e4 LT |
71 | |
72 | #ifdef CONFIG_SMP | |
a6e120ed TG |
73 | seq_puts(p, "IPI: "); |
74 | for_each_online_cpu(j) | |
75 | seq_printf(p, "%10lu ", cpu_data[j].ipi_count); | |
76 | seq_putc(p, '\n'); | |
1da177e4 | 77 | #endif |
a6e120ed TG |
78 | seq_puts(p, "PMI: "); |
79 | for_each_online_cpu(j) | |
80 | seq_printf(p, "%10lu ", per_cpu(irq_pmi_count, j)); | |
81 | seq_puts(p, " Performance Monitoring\n"); | |
82 | seq_printf(p, "ERR: %10lu\n", irq_err_count); | |
1da177e4 LT |
83 | return 0; |
84 | } | |
85 | ||
1da177e4 LT |
86 | /* |
87 | * handle_irq handles all normal device IRQ's (the special | |
88 | * SMP cross-CPU interrupts have their own specific | |
89 | * handlers). | |
90 | */ | |
91 | ||
92 | #define MAX_ILLEGAL_IRQS 16 | |
93 | ||
94 | void | |
3dbb8c62 | 95 | handle_irq(int irq) |
1da177e4 LT |
96 | { |
97 | /* | |
98 | * We ack quickly, we don't want the irq controller | |
99 | * thinking we're snobs just because some other CPU has | |
100 | * disabled global interrupts (we have already done the | |
101 | * INT_ACK cycles, it's too late to try to pretend to the | |
102 | * controller that we aren't taking the interrupt). | |
103 | * | |
104 | * 0 return value means that this irq is already being | |
105 | * handled by some other CPU. (or is disabled) | |
106 | */ | |
1da177e4 | 107 | static unsigned int illegal_count=0; |
a891b393 | 108 | struct irq_desc *desc = irq_to_desc(irq); |
1da177e4 | 109 | |
a891b393 KM |
110 | if (!desc || ((unsigned) irq > ACTUAL_NR_IRQS && |
111 | illegal_count < MAX_ILLEGAL_IRQS)) { | |
1da177e4 LT |
112 | irq_err_count++; |
113 | illegal_count++; | |
114 | printk(KERN_CRIT "device_interrupt: invalid interrupt %d\n", | |
115 | irq); | |
116 | return; | |
117 | } | |
118 | ||
f5de6ecc | 119 | irq_enter(); |
bd0b9ac4 | 120 | generic_handle_irq_desc(desc); |
1da177e4 LT |
121 | irq_exit(); |
122 | } |