LXR linux/arch/x86/kvm/irq.h

   1/* SPDX-License-Identifier: GPL-2.0-only */
   2/*
   3 * irq.h: in kernel interrupt controller related definitions
   4 * Copyright (c) 2007, Intel Corporation.
   5 *
   6 * Authors:
   7 *   Yaozu (Eddie) Dong <Eddie.dong@intel.com>
   8 */
   9
  10#ifndef __IRQ_H
  11#define __IRQ_H
  12
  13#include <linux/mm_types.h>
  14#include <linux/hrtimer.h>
  15#include <linux/kvm_host.h>
  16#include <linux/spinlock.h>
  17
  18#include <kvm/iodev.h>
  19#include "ioapic.h"
  20#include "lapic.h"
  21
  22#define PIC_NUM_PINS 16
  23#define SELECT_PIC(irq) \
  24        ((irq) < 8 ? KVM_IRQCHIP_PIC_MASTER : KVM_IRQCHIP_PIC_SLAVE)
  25
  26struct kvm;
  27struct kvm_vcpu;
  28
  29struct kvm_kpic_state {
  30        u8 last_irr;    /* edge detection */
  31        u8 irr;         /* interrupt request register */
  32        u8 imr;         /* interrupt mask register */
  33        u8 isr;         /* interrupt service register */
  34        u8 priority_add;        /* highest irq priority */
  35        u8 irq_base;
  36        u8 read_reg_select;
  37        u8 poll;
  38        u8 special_mask;
  39        u8 init_state;
  40        u8 auto_eoi;
  41        u8 rotate_on_auto_eoi;
  42        u8 special_fully_nested_mode;
  43        u8 init4;               /* true if 4 byte init */
  44        u8 elcr;                /* PIIX edge/trigger selection */
  45        u8 elcr_mask;
  46        u8 isr_ack;     /* interrupt ack detection */
  47        struct kvm_pic *pics_state;
  48};
  49
  50struct kvm_pic {
  51        spinlock_t lock;
  52        bool wakeup_needed;
  53        unsigned pending_acks;
  54        struct kvm *kvm;
  55        struct kvm_kpic_state pics[2]; /* 0 is master pic, 1 is slave pic */
  56        int output;             /* intr from master PIC */
  57        struct kvm_io_device dev_master;
  58        struct kvm_io_device dev_slave;
  59        struct kvm_io_device dev_eclr;
  60        void (*ack_notifier)(void *opaque, int irq);
  61        unsigned long irq_states[PIC_NUM_PINS];
  62};
  63
  64int kvm_pic_init(struct kvm *kvm);
  65void kvm_pic_destroy(struct kvm *kvm);
  66int kvm_pic_read_irq(struct kvm *kvm);
  67void kvm_pic_update_irq(struct kvm_pic *s);
  68
  69static inline int pic_in_kernel(struct kvm *kvm)
  70{
  71        int mode = kvm->arch.irqchip_mode;
  72
  73        /* Matches smp_wmb() when setting irqchip_mode */
  74        smp_rmb();
  75        return mode == KVM_IRQCHIP_KERNEL;
  76}
  77
  78static inline int irqchip_split(struct kvm *kvm)
  79{
  80        int mode = kvm->arch.irqchip_mode;
  81
  82        /* Matches smp_wmb() when setting irqchip_mode */
  83        smp_rmb();
  84        return mode == KVM_IRQCHIP_SPLIT;
  85}
  86
  87static inline int irqchip_kernel(struct kvm *kvm)
  88{
  89        int mode = kvm->arch.irqchip_mode;
  90
  91        /* Matches smp_wmb() when setting irqchip_mode */
  92        smp_rmb();
  93        return mode == KVM_IRQCHIP_KERNEL;
  94}
  95
  96static inline int irqchip_in_kernel(struct kvm *kvm)
  97{
  98        int mode = kvm->arch.irqchip_mode;
  99
 100        /* Matches smp_wmb() when setting irqchip_mode */
 101        smp_rmb();
 102        return mode != KVM_IRQCHIP_NONE;
 103}
 104
 105void kvm_inject_pending_timer_irqs(struct kvm_vcpu *vcpu);
 106void kvm_inject_apic_timer_irqs(struct kvm_vcpu *vcpu);
 107void kvm_apic_nmi_wd_deliver(struct kvm_vcpu *vcpu);
 108void __kvm_migrate_apic_timer(struct kvm_vcpu *vcpu);
 109void __kvm_migrate_pit_timer(struct kvm_vcpu *vcpu);
 110void __kvm_migrate_timers(struct kvm_vcpu *vcpu);
 111
 112int apic_has_pending_timer(struct kvm_vcpu *vcpu);
 113
 114int kvm_setup_default_irq_routing(struct kvm *kvm);
 115int kvm_setup_empty_irq_routing(struct kvm *kvm);
 116
 117#endif
 118