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
)
47 struct irq_desc
*desc
= irq_to_desc
[irq
];
49 int cpu
= last_cpu
+ 1;
51 if (!desc
|| !get_irq_desc_chip(desc
)->set_affinity
|| irq_user_affinity
[irq
])
54 while (!cpu_possible(cpu
) ||
55 !cpumask_test_cpu(cpu
, irq_default_affinity
))
56 cpu
= (cpu
< (NR_CPUS
-1) ? cpu
+ 1 : 0);
59 cpumask_copy(desc
->affinity
, cpumask_of(cpu
));
60 get_irq_desc_chip(desc
)->set_affinity(irq
, cpumask_of(cpu
));
63 #endif /* CONFIG_SMP */
66 show_interrupts(struct seq_file
*p
, void *v
)
69 int irq
= *(loff_t
*) v
;
70 struct irqaction
* action
;
71 struct irq_desc
*desc
;
77 for_each_online_cpu(j
)
78 seq_printf(p
, "CPU%d ", j
);
83 if (irq
< ACTUAL_NR_IRQS
) {
84 desc
= irq_to_desc(irq
);
89 raw_spin_lock_irqsave(&desc
->lock
, flags
);
90 action
= desc
->action
;
93 seq_printf(p
, "%3d: ", irq
);
95 seq_printf(p
, "%10u ", kstat_irqs(irq
));
97 for_each_online_cpu(j
)
98 seq_printf(p
, "%10u ", kstat_irqs_cpu(irq
, j
));
100 seq_printf(p
, " %14s", get_irq_desc_chip(desc
)->name
);
101 seq_printf(p
, " %c%s",
102 (action
->flags
& IRQF_DISABLED
)?'+':' ',
105 for (action
=action
->next
; action
; action
= action
->next
) {
106 seq_printf(p
, ", %c%s",
107 (action
->flags
& IRQF_DISABLED
)?'+':' ',
113 raw_spin_unlock_irqrestore(&desc
->lock
, flags
);
114 } else if (irq
== ACTUAL_NR_IRQS
) {
116 seq_puts(p
, "IPI: ");
117 for_each_online_cpu(j
)
118 seq_printf(p
, "%10lu ", cpu_data
[j
].ipi_count
);
121 seq_puts(p
, "PMI: ");
122 for_each_online_cpu(j
)
123 seq_printf(p
, "%10lu ", per_cpu(irq_pmi_count
, j
));
124 seq_puts(p
, " Performance Monitoring\n");
125 seq_printf(p
, "ERR: %10lu\n", irq_err_count
);
131 * handle_irq handles all normal device IRQ's (the special
132 * SMP cross-CPU interrupts have their own specific
136 #define MAX_ILLEGAL_IRQS 16
142 * We ack quickly, we don't want the irq controller
143 * thinking we're snobs just because some other CPU has
144 * disabled global interrupts (we have already done the
145 * INT_ACK cycles, it's too late to try to pretend to the
146 * controller that we aren't taking the interrupt).
148 * 0 return value means that this irq is already being
149 * handled by some other CPU. (or is disabled)
151 static unsigned int illegal_count
=0;
152 struct irq_desc
*desc
= irq_to_desc(irq
);
154 if (!desc
|| ((unsigned) irq
> ACTUAL_NR_IRQS
&&
155 illegal_count
< MAX_ILLEGAL_IRQS
)) {
158 printk(KERN_CRIT
"device_interrupt: invalid interrupt %d\n",
164 * From here we must proceed with IPL_MAX. Note that we do not
165 * explicitly enable interrupts afterwards - some MILO PALcode
166 * (namely LX164 one) seems to have severe problems with RTI
171 generic_handle_irq_desc(irq
, desc
);
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