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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/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}
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * linux/arch/alpha/kernel/irq.c
4 *
5 * Copyright (C) 1995 Linus Torvalds
6 *
7 * This file contains the code used by various IRQ handling routines:
8 * asking for different IRQ's should be done through these routines
9 * instead of just grabbing them. Thus setups with different IRQ numbers
10 * shouldn't result in any weird surprises, and installing new handlers
11 * should be easier.
12 */
13
14#include <linux/kernel.h>
15#include <linux/module.h>
16#include <linux/errno.h>
17#include <linux/kernel_stat.h>
18#include <linux/signal.h>
19#include <linux/sched.h>
20#include <linux/ptrace.h>
21#include <linux/interrupt.h>
22#include <linux/random.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/io.h>
30#include <linux/uaccess.h>
31
32volatile unsigned long irq_err_count;
33DEFINE_PER_CPU(unsigned long, irq_pmi_count);
34
35void ack_bad_irq(unsigned int irq)
36{
37 irq_err_count++;
38 printk(KERN_CRIT "Unexpected IRQ trap at vector %u\n", irq);
39}
40
41#ifdef CONFIG_SMP
42static char irq_user_affinity[NR_IRQS];
43
44int irq_select_affinity(unsigned int irq)
45{
46 struct irq_data *data = irq_get_irq_data(irq);
47 struct irq_chip *chip;
48 static int last_cpu;
49 int cpu = last_cpu + 1;
50
51 if (!data)
52 return 1;
53 chip = irq_data_get_irq_chip(data);
54
55 if (!chip->irq_set_affinity || irq_user_affinity[irq])
56 return 1;
57
58 while (!cpu_possible(cpu) ||
59 !cpumask_test_cpu(cpu, irq_default_affinity))
60 cpu = (cpu < (NR_CPUS-1) ? cpu + 1 : 0);
61 last_cpu = cpu;
62
63 irq_data_update_affinity(data, cpumask_of(cpu));
64 chip->irq_set_affinity(data, cpumask_of(cpu), false);
65 return 0;
66}
67#endif /* CONFIG_SMP */
68
69int arch_show_interrupts(struct seq_file *p, int prec)
70{
71 int j;
72
73#ifdef CONFIG_SMP
74 seq_puts(p, "IPI: ");
75 for_each_online_cpu(j)
76 seq_printf(p, "%10lu ", cpu_data[j].ipi_count);
77 seq_putc(p, '\n');
78#endif
79 seq_puts(p, "PMI: ");
80 for_each_online_cpu(j)
81 seq_printf(p, "%10lu ", per_cpu(irq_pmi_count, j));
82 seq_puts(p, " Performance Monitoring\n");
83 seq_printf(p, "ERR: %10lu\n", irq_err_count);
84 return 0;
85}
86
87/*
88 * handle_irq handles all normal device IRQ's (the special
89 * SMP cross-CPU interrupts have their own specific
90 * handlers).
91 */
92
93#define MAX_ILLEGAL_IRQS 16
94
95void
96handle_irq(int irq)
97{
98 /*
99 * We ack quickly, we don't want the irq controller
100 * thinking we're snobs just because some other CPU has
101 * disabled global interrupts (we have already done the
102 * INT_ACK cycles, it's too late to try to pretend to the
103 * controller that we aren't taking the interrupt).
104 *
105 * 0 return value means that this irq is already being
106 * handled by some other CPU. (or is disabled)
107 */
108 static unsigned int illegal_count=0;
109 struct irq_desc *desc = irq_to_desc(irq);
110
111 if (!desc || ((unsigned) irq > ACTUAL_NR_IRQS &&
112 illegal_count < MAX_ILLEGAL_IRQS)) {
113 irq_err_count++;
114 illegal_count++;
115 printk(KERN_CRIT "device_interrupt: invalid interrupt %d\n",
116 irq);
117 return;
118 }
119
120 irq_enter();
121 generic_handle_irq_desc(desc);
122 irq_exit();
123}