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 "lapic.h"
  20
  21 #define PIC_NUM_PINS 16
  22 #define SELECT_PIC(irq) \
  23         ((irq) < 8 ? KVM_IRQCHIP_PIC_MASTER : KVM_IRQCHIP_PIC_SLAVE)
  24
  25 struct kvm;
  26 struct kvm_vcpu;
  27
  28 struct kvm_kpic_state {
  29         u8 last_irr;    /* edge detection */
  30         u8 irr;         /* interrupt request register */
  31         u8 imr;         /* interrupt mask register */
  32         u8 isr;         /* interrupt service register */
  33         u8 priority_add;        /* highest irq priority */
  34         u8 irq_base;
  35         u8 read_reg_select;
  36         u8 poll;
  37         u8 special_mask;
  38         u8 init_state;
  39         u8 auto_eoi;
  40         u8 rotate_on_auto_eoi;
  41         u8 special_fully_nested_mode;
  42         u8 init4;               /* true if 4 byte init */
  43         u8 elcr;                /* PIIX edge/trigger selection */
  44         u8 elcr_mask;
  45         u8 isr_ack;     /* interrupt ack detection */
  46         struct kvm_pic *pics_state;
  47 };
  48
  49 struct kvm_pic {
  50         spinlock_t lock;
  51         bool wakeup_needed;
  52         unsigned pending_acks;
  53         struct kvm *kvm;
  54         struct kvm_kpic_state pics[2]; /* 0 is master pic, 1 is slave pic */
  55         int output;             /* intr from master PIC */
  56         struct kvm_io_device dev_master;
  57         struct kvm_io_device dev_slave;
  58         struct kvm_io_device dev_elcr;
  59         unsigned long irq_states[PIC_NUM_PINS];
  60 };
  61
  62 int kvm_pic_init(struct kvm *kvm);
  63 void kvm_pic_destroy(struct kvm *kvm);
  64 int kvm_pic_read_irq(struct kvm *kvm);
  65 void kvm_pic_update_irq(struct kvm_pic *s);
  66
  67 static inline int irqchip_split(struct kvm *kvm)
  68 {
  69         int mode = kvm->arch.irqchip_mode;
  70
  71         /* Matches smp_wmb() when setting irqchip_mode */
  72         smp_rmb();
  73         return mode == KVM_IRQCHIP_SPLIT;
  74 }
  75
  76 static inline int irqchip_kernel(struct kvm *kvm)
  77 {
  78         int mode = kvm->arch.irqchip_mode;
  79
  80         /* Matches smp_wmb() when setting irqchip_mode */
  81         smp_rmb();
  82         return mode == KVM_IRQCHIP_KERNEL;
  83 }
  84
  85 static inline int pic_in_kernel(struct kvm *kvm)
  86 {
  87         return irqchip_kernel(kvm);
  88 }
  89
  90 static inline int irqchip_in_kernel(struct kvm *kvm)
  91 {
  92         int mode = kvm->arch.irqchip_mode;
  93
  94         /* Matches smp_wmb() when setting irqchip_mode */
  95         smp_rmb();
  96         return mode != KVM_IRQCHIP_NONE;
  97 }
  98
  99 void kvm_inject_pending_timer_irqs(struct kvm_vcpu *vcpu);
 100 void kvm_inject_apic_timer_irqs(struct kvm_vcpu *vcpu);
 101 void kvm_apic_nmi_wd_deliver(struct kvm_vcpu *vcpu);
 102 void __kvm_migrate_apic_timer(struct kvm_vcpu *vcpu);
 103 void __kvm_migrate_pit_timer(struct kvm_vcpu *vcpu);
 104 void __kvm_migrate_timers(struct kvm_vcpu *vcpu);
 105
 106 int apic_has_pending_timer(struct kvm_vcpu *vcpu);
 107
 108 int kvm_setup_default_irq_routing(struct kvm *kvm);
 109 int kvm_irq_delivery_to_apic(struct kvm *kvm, struct kvm_lapic *src,
 110                              struct kvm_lapic_irq *irq,
 111                              struct dest_map *dest_map);
 112
 113 #endif