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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/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>
28
29#include <asm/system.h>
30#include <asm/io.h>
31#include <asm/uaccess.h>
32
33volatile unsigned long irq_err_count;
34DEFINE_PER_CPU(unsigned long, irq_pmi_count);
35
36void ack_bad_irq(unsigned int irq)
37{
38 irq_err_count++;
39 printk(KERN_CRIT "Unexpected IRQ trap at vector %u\n", irq);
40}
41
42#ifdef CONFIG_SMP
43static char irq_user_affinity[NR_IRQS];
44
45int irq_select_affinity(unsigned int irq)
46{
47 struct irq_data *data = irq_get_irq_data(irq);
48 struct irq_chip *chip;
49 static int last_cpu;
50 int cpu = last_cpu + 1;
51
52 if (!data)
53 return 1;
54 chip = irq_data_get_irq_chip(data);
55
56 if (!chip->irq_set_affinity || irq_user_affinity[irq])
57 return 1;
58
59 while (!cpu_possible(cpu) ||
60 !cpumask_test_cpu(cpu, irq_default_affinity))
61 cpu = (cpu < (NR_CPUS-1) ? cpu + 1 : 0);
62 last_cpu = cpu;
63
64 cpumask_copy(data->affinity, cpumask_of(cpu));
65 chip->irq_set_affinity(data, cpumask_of(cpu), false);
66 return 0;
67}
68#endif /* CONFIG_SMP */
69
70int arch_show_interrupts(struct seq_file *p, int prec)
71{
72 int j;
73
74#ifdef CONFIG_SMP
75 seq_puts(p, "IPI: ");
76 for_each_online_cpu(j)
77 seq_printf(p, "%10lu ", cpu_data[j].ipi_count);
78 seq_putc(p, '\n');
79#endif
80 seq_puts(p, "PMI: ");
81 for_each_online_cpu(j)
82 seq_printf(p, "%10lu ", per_cpu(irq_pmi_count, j));
83 seq_puts(p, " Performance Monitoring\n");
84 seq_printf(p, "ERR: %10lu\n", irq_err_count);
85 return 0;
86}
87
88/*
89 * handle_irq handles all normal device IRQ's (the special
90 * SMP cross-CPU interrupts have their own specific
91 * handlers).
92 */
93
94#define MAX_ILLEGAL_IRQS 16
95
96void
97handle_irq(int irq)
98{
99 /*
100 * We ack quickly, we don't want the irq controller
101 * thinking we're snobs just because some other CPU has
102 * disabled global interrupts (we have already done the
103 * INT_ACK cycles, it's too late to try to pretend to the
104 * controller that we aren't taking the interrupt).
105 *
106 * 0 return value means that this irq is already being
107 * handled by some other CPU. (or is disabled)
108 */
109 static unsigned int illegal_count=0;
110 struct irq_desc *desc = irq_to_desc(irq);
111
112 if (!desc || ((unsigned) irq > ACTUAL_NR_IRQS &&
113 illegal_count < MAX_ILLEGAL_IRQS)) {
114 irq_err_count++;
115 illegal_count++;
116 printk(KERN_CRIT "device_interrupt: invalid interrupt %d\n",
117 irq);
118 return;
119 }
120
121 /*
122 * From here we must proceed with IPL_MAX. Note that we do not
123 * explicitly enable interrupts afterwards - some MILO PALcode
124 * (namely LX164 one) seems to have severe problems with RTI
125 * at IPL 0.
126 */
127 local_irq_disable();
128 irq_enter();
129 generic_handle_irq_desc(irq, desc);
130 irq_exit();
131}
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/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/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
28#include <asm/io.h>
29#include <asm/uaccess.h>
30
31volatile unsigned long irq_err_count;
32DEFINE_PER_CPU(unsigned long, irq_pmi_count);
33
34void ack_bad_irq(unsigned int irq)
35{
36 irq_err_count++;
37 printk(KERN_CRIT "Unexpected IRQ trap at vector %u\n", irq);
38}
39
40#ifdef CONFIG_SMP
41static char irq_user_affinity[NR_IRQS];
42
43int irq_select_affinity(unsigned int irq)
44{
45 struct irq_data *data = irq_get_irq_data(irq);
46 struct irq_chip *chip;
47 static int last_cpu;
48 int cpu = last_cpu + 1;
49
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])
55 return 1;
56
57 while (!cpu_possible(cpu) ||
58 !cpumask_test_cpu(cpu, irq_default_affinity))
59 cpu = (cpu < (NR_CPUS-1) ? cpu + 1 : 0);
60 last_cpu = cpu;
61
62 cpumask_copy(irq_data_get_affinity_mask(data), cpumask_of(cpu));
63 chip->irq_set_affinity(data, cpumask_of(cpu), false);
64 return 0;
65}
66#endif /* CONFIG_SMP */
67
68int arch_show_interrupts(struct seq_file *p, int prec)
69{
70 int j;
71
72#ifdef CONFIG_SMP
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');
77#endif
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);
83 return 0;
84}
85
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
94void
95handle_irq(int irq)
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 */
107 static unsigned int illegal_count=0;
108 struct irq_desc *desc = irq_to_desc(irq);
109
110 if (!desc || ((unsigned) irq > ACTUAL_NR_IRQS &&
111 illegal_count < MAX_ILLEGAL_IRQS)) {
112 irq_err_count++;
113 illegal_count++;
114 printk(KERN_CRIT "device_interrupt: invalid interrupt %d\n",
115 irq);
116 return;
117 }
118
119 irq_enter();
120 generic_handle_irq_desc(desc);
121 irq_exit();
122}