1 // SPDX-License-Identifier: GPL-2.0 1 // SPDX-License-Identifier: GPL-2.0
2 // Copyright (C) 2018 Hangzhou C-SKY Microsyst !! 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 */
3 13
4 #include <linux/init.h> !! 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>
5 #include <linux/interrupt.h> 21 #include <linux/interrupt.h>
>> 22 #include <linux/random.h>
6 #include <linux/irq.h> 23 #include <linux/irq.h>
7 #include <linux/irqchip.h> !! 24 #include <linux/proc_fs.h>
8 #include <asm/traps.h> !! 25 #include <linux/seq_file.h>
9 #include <asm/smp.h> !! 26 #include <linux/profile.h>
>> 27 #include <linux/bitops.h>
10 28
11 void __init init_IRQ(void) !! 29 #include <asm/io.h>
>> 30 #include <linux/uaccess.h>
>> 31 #include "irq_impl.h"
>> 32
>> 33 volatile unsigned long irq_err_count;
>> 34 DEFINE_PER_CPU(unsigned long, irq_pmi_count);
>> 35
>> 36 void 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
>> 43 static char irq_user_affinity[NR_IRQS];
>> 44
>> 45 int 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 irq_data_update_affinity(data, cpumask_of(cpu));
>> 65 chip->irq_set_affinity(data, cpumask_of(cpu), false);
>> 66 return 0;
>> 67 }
>> 68 #endif /* CONFIG_SMP */
>> 69
>> 70 int arch_show_interrupts(struct seq_file *p, int prec)
12 { 71 {
13 irqchip_init(); !! 72 int j;
>> 73
14 #ifdef CONFIG_SMP 74 #ifdef CONFIG_SMP
15 setup_smp_ipi(); !! 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');
16 #endif 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
>> 96 void
>> 97 handle_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 irq_enter();
>> 122 generic_handle_irq_desc(desc);
>> 123 irq_exit();
17 } 124 }
18 125
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