2 * linux/arch/alpha/kernel/irq.c
4 * Copyright (C) 1995 Linus Torvalds
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
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>
21 #include <linux/random.h>
22 #include <linux/init.h>
23 #include <linux/irq.h>
24 #include <linux/proc_fs.h>
25 #include <linux/seq_file.h>
26 #include <linux/profile.h>
27 #include <linux/bitops.h>
29 #include <asm/system.h>
31 #include <asm/uaccess.h>
33 volatile unsigned long irq_err_count
;
34 DEFINE_PER_CPU(unsigned long, irq_pmi_count
);
36 void ack_bad_irq(unsigned int irq
)
39 printk(KERN_CRIT
"Unexpected IRQ trap at vector %u\n", irq
);
43 static char irq_user_affinity
[NR_IRQS
];
45 int irq_select_affinity(unsigned int irq
)
48 int cpu
= last_cpu
+ 1;
50 if (!irq_desc
[irq
].chip
->set_affinity
|| irq_user_affinity
[irq
])
53 while (!cpu_possible(cpu
) ||
54 !cpumask_test_cpu(cpu
, irq_default_affinity
))
55 cpu
= (cpu
< (NR_CPUS
-1) ? cpu
+ 1 : 0);
58 cpumask_copy(irq_desc
[irq
].affinity
, cpumask_of(cpu
));
59 irq_desc
[irq
].chip
->set_affinity(irq
, cpumask_of(cpu
));
62 #endif /* CONFIG_SMP */
65 show_interrupts(struct seq_file
*p
, void *v
)
68 int irq
= *(loff_t
*) v
;
69 struct irqaction
* action
;
75 for_each_online_cpu(j
)
76 seq_printf(p
, "CPU%d ", j
);
81 if (irq
< ACTUAL_NR_IRQS
) {
82 raw_spin_lock_irqsave(&irq_desc
[irq
].lock
, flags
);
83 action
= irq_desc
[irq
].action
;
86 seq_printf(p
, "%3d: ", irq
);
88 seq_printf(p
, "%10u ", kstat_irqs(irq
));
90 for_each_online_cpu(j
)
91 seq_printf(p
, "%10u ", kstat_irqs_cpu(irq
, j
));
93 seq_printf(p
, " %14s", irq_desc
[irq
].chip
->name
);
94 seq_printf(p
, " %c%s",
95 (action
->flags
& IRQF_DISABLED
)?'+':' ',
98 for (action
=action
->next
; action
; action
= action
->next
) {
99 seq_printf(p
, ", %c%s",
100 (action
->flags
& IRQF_DISABLED
)?'+':' ',
106 raw_spin_unlock_irqrestore(&irq_desc
[irq
].lock
, flags
);
107 } else if (irq
== ACTUAL_NR_IRQS
) {
109 seq_puts(p
, "IPI: ");
110 for_each_online_cpu(j
)
111 seq_printf(p
, "%10lu ", cpu_data
[j
].ipi_count
);
114 seq_puts(p
, "PMI: ");
115 for_each_online_cpu(j
)
116 seq_printf(p
, "%10lu ", per_cpu(irq_pmi_count
, j
));
117 seq_puts(p
, " Performance Monitoring\n");
118 seq_printf(p
, "ERR: %10lu\n", irq_err_count
);
124 * handle_irq handles all normal device IRQ's (the special
125 * SMP cross-CPU interrupts have their own specific
129 #define MAX_ILLEGAL_IRQS 16
135 * We ack quickly, we don't want the irq controller
136 * thinking we're snobs just because some other CPU has
137 * disabled global interrupts (we have already done the
138 * INT_ACK cycles, it's too late to try to pretend to the
139 * controller that we aren't taking the interrupt).
141 * 0 return value means that this irq is already being
142 * handled by some other CPU. (or is disabled)
144 static unsigned int illegal_count
=0;
146 if ((unsigned) irq
> ACTUAL_NR_IRQS
&& illegal_count
< MAX_ILLEGAL_IRQS
) {
149 printk(KERN_CRIT
"device_interrupt: invalid interrupt %d\n",
156 * __do_IRQ() must be called with IPL_MAX. Note that we do not
157 * explicitly enable interrupts afterwards - some MILO PALcode
158 * (namely LX164 one) seems to have severe problems with RTI
This page took 0.035823 seconds and 5 git commands to generate.