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123 lines
3.0 KiB
123 lines
3.0 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* linux/arch/alpha/kernel/irq.c |
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* |
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* Copyright (C) 1995 Linus Torvalds |
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* |
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* This file contains the code used by various IRQ handling routines: |
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* asking for different IRQ's should be done through these routines |
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* instead of just grabbing them. Thus setups with different IRQ numbers |
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* shouldn't result in any weird surprises, and installing new handlers |
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* should be easier. |
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*/ |
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#include <linux/kernel.h> |
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#include <linux/module.h> |
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#include <linux/errno.h> |
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#include <linux/kernel_stat.h> |
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#include <linux/signal.h> |
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#include <linux/sched.h> |
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#include <linux/ptrace.h> |
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#include <linux/interrupt.h> |
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#include <linux/random.h> |
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#include <linux/irq.h> |
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#include <linux/proc_fs.h> |
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#include <linux/seq_file.h> |
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#include <linux/profile.h> |
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#include <linux/bitops.h> |
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#include <asm/io.h> |
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#include <linux/uaccess.h> |
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volatile unsigned long irq_err_count; |
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DEFINE_PER_CPU(unsigned long, irq_pmi_count); |
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void ack_bad_irq(unsigned int irq) |
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{ |
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irq_err_count++; |
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printk(KERN_CRIT "Unexpected IRQ trap at vector %u\n", irq); |
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} |
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#ifdef CONFIG_SMP |
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static char irq_user_affinity[NR_IRQS]; |
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int irq_select_affinity(unsigned int irq) |
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{ |
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struct irq_data *data = irq_get_irq_data(irq); |
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struct irq_chip *chip; |
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static int last_cpu; |
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int cpu = last_cpu + 1; |
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if (!data) |
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return 1; |
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chip = irq_data_get_irq_chip(data); |
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if (!chip->irq_set_affinity || irq_user_affinity[irq]) |
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return 1; |
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while (!cpu_possible(cpu) || |
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!cpumask_test_cpu(cpu, irq_default_affinity)) |
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cpu = (cpu < (NR_CPUS-1) ? cpu + 1 : 0); |
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last_cpu = cpu; |
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cpumask_copy(irq_data_get_affinity_mask(data), cpumask_of(cpu)); |
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chip->irq_set_affinity(data, cpumask_of(cpu), false); |
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return 0; |
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} |
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#endif /* CONFIG_SMP */ |
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int arch_show_interrupts(struct seq_file *p, int prec) |
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{ |
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int j; |
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#ifdef CONFIG_SMP |
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seq_puts(p, "IPI: "); |
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for_each_online_cpu(j) |
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seq_printf(p, "%10lu ", cpu_data[j].ipi_count); |
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seq_putc(p, '\n'); |
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#endif |
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seq_puts(p, "PMI: "); |
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for_each_online_cpu(j) |
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seq_printf(p, "%10lu ", per_cpu(irq_pmi_count, j)); |
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seq_puts(p, " Performance Monitoring\n"); |
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seq_printf(p, "ERR: %10lu\n", irq_err_count); |
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return 0; |
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} |
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/* |
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* handle_irq handles all normal device IRQ's (the special |
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* SMP cross-CPU interrupts have their own specific |
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* handlers). |
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*/ |
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#define MAX_ILLEGAL_IRQS 16 |
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void |
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handle_irq(int irq) |
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{ |
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/* |
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* We ack quickly, we don't want the irq controller |
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* thinking we're snobs just because some other CPU has |
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* disabled global interrupts (we have already done the |
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* INT_ACK cycles, it's too late to try to pretend to the |
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* controller that we aren't taking the interrupt). |
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* |
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* 0 return value means that this irq is already being |
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* handled by some other CPU. (or is disabled) |
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*/ |
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static unsigned int illegal_count=0; |
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struct irq_desc *desc = irq_to_desc(irq); |
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if (!desc || ((unsigned) irq > ACTUAL_NR_IRQS && |
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illegal_count < MAX_ILLEGAL_IRQS)) { |
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irq_err_count++; |
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illegal_count++; |
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printk(KERN_CRIT "device_interrupt: invalid interrupt %d\n", |
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irq); |
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return; |
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} |
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irq_enter(); |
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generic_handle_irq_desc(desc); |
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irq_exit(); |
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}
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