kexec.c

 1// SPDX-License-Identifier: GPL-2.0
 2
 3#include <linux/interrupt.h>
 4#include <linux/irq.h>
 5#include <linux/irqdesc.h>
 6#include <linux/irqnr.h>
 7
 8#include "internals.h"
 9
10void machine_kexec_mask_interrupts(void)
11{
12	struct irq_desc *desc;
13	unsigned int i;
14
15	for_each_irq_desc(i, desc) {
16		struct irq_chip *chip;
17		int check_eoi = 1;
18
19		chip = irq_desc_get_chip(desc);
20		if (!chip || !irqd_is_started(&desc->irq_data))
21			continue;
22
23		if (IS_ENABLED(CONFIG_GENERIC_IRQ_KEXEC_CLEAR_VM_FORWARD)) {
24			/*
25			 * First try to remove the active state from an interrupt which is forwarded
26			 * to a VM. If the interrupt is not forwarded, try to EOI the interrupt.
27			 */
28			check_eoi = irq_set_irqchip_state(i, IRQCHIP_STATE_ACTIVE, false);
29		}
30
31		if (check_eoi && chip->irq_eoi && irqd_irq_inprogress(&desc->irq_data))
32			chip->irq_eoi(&desc->irq_data);
33
34		irq_shutdown(desc);
35	}
36}