linux/kernel/irq/handle.c

// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright (C) 1992, 1998-2006 Linus Torvalds, Ingo Molnar
 * Copyright (C) 2005-2006, Thomas Gleixner, Russell King
 *
 * This file contains the core interrupt handling code. Detailed
 * information is available in Documentation/core-api/genericirq.rst
 *
 */

#include <linux/irq.h>
#include <linux/random.h>
#include <linux/sched.h>
#include <linux/interrupt.h>
#include <linux/kernel_stat.h>

#include <asm/irq_regs.h>

#include <trace/events/irq.h>

#include "internals.h"

#ifdef CONFIG_GENERIC_IRQ_MULTI_HANDLER
void (*handle_arch_irq)(struct pt_regs *) __ro_after_init;
#endif

/**
 * handle_bad_irq - handle spurious and unhandled irqs
 * @desc:      description of the interrupt
 *
 * Handles spurious and unhandled IRQ's. It also prints a debugmessage.
 */
void handle_bad_irq(struct irq_desc *desc)
{ … }
EXPORT_SYMBOL_GPL(…);

/*
 * Special, empty irq handler:
 */
irqreturn_t no_action(int cpl, void *dev_id)
{ … }
EXPORT_SYMBOL_GPL(…);

static void warn_no_thread(unsigned int irq, struct irqaction *action)
{ … }

void __irq_wake_thread(struct irq_desc *desc, struct irqaction *action)
{ … }

irqreturn_t __handle_irq_event_percpu(struct irq_desc *desc)
{ … }

irqreturn_t handle_irq_event_percpu(struct irq_desc *desc)
{ … }

irqreturn_t handle_irq_event(struct irq_desc *desc)
{ … }

#ifdef CONFIG_GENERIC_IRQ_MULTI_HANDLER
int __init set_handle_irq(void (*handle_irq)(struct pt_regs *))
{
	if (handle_arch_irq)
		return -EBUSY;

	handle_arch_irq = handle_irq;
	return 0;
}

/**
 * generic_handle_arch_irq - root irq handler for architectures which do no
 *                           entry accounting themselves
 * @regs:	Register file coming from the low-level handling code
 */
asmlinkage void noinstr generic_handle_arch_irq(struct pt_regs *regs)
{
	struct pt_regs *old_regs;

	irq_enter();
	old_regs = set_irq_regs(regs);
	handle_arch_irq(regs);
	set_irq_regs(old_regs);
	irq_exit();
}
#endif