kernel/irq/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
  10 void 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 }