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

   1/*
   2 * irq.h: in kernel interrupt controller related definitions
   3 * Copyright (c) 2007, Intel Corporation.
   4 *
   5 * This program is free software; you can redistribute it and/or modify it
   6 * under the terms and conditions of the GNU General Public License,
   7 * version 2, as published by the Free Software Foundation.
   8 *
   9 * This program is distributed in the hope it will be useful, but WITHOUT
  10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  12 * more details.
  13 *
  14 * You should have received a copy of the GNU General Public License along with
  15 * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
  16 * Place - Suite 330, Boston, MA 02111-1307 USA.
  17 * Authors:
  18 *   Yaozu (Eddie) Dong <Eddie.dong@intel.com>
  19 *
  20 */
  21
  22#ifndef __IRQ_H
  23#define __IRQ_H
  24
  25#include <linux/mm_types.h>
  26#include <linux/hrtimer.h>
  27#include <linux/kvm_host.h>
  28#include <linux/spinlock.h>
  29
  30#include <kvm/iodev.h>
  31#include "ioapic.h"
  32#include "lapic.h"
  33
  34#define PIC_NUM_PINS 16
  35#define SELECT_PIC(irq) \
  36        ((irq) < 8 ? KVM_IRQCHIP_PIC_MASTER : KVM_IRQCHIP_PIC_SLAVE)
  37
  38struct kvm;
  39struct kvm_vcpu;
  40
  41struct kvm_kpic_state {
  42        u8 last_irr;    /* edge detection */
  43        u8 irr;         /* interrupt request register */
  44        u8 imr;         /* interrupt mask register */
  45        u8 isr;         /* interrupt service register */
  46        u8 priority_add;        /* highest irq priority */
  47        u8 irq_base;
  48        u8 read_reg_select;
  49        u8 poll;
  50        u8 special_mask;
  51        u8 init_state;
  52        u8 auto_eoi;
  53        u8 rotate_on_auto_eoi;
  54        u8 special_fully_nested_mode;
  55        u8 init4;               /* true if 4 byte init */
  56        u8 elcr;                /* PIIX edge/trigger selection */
  57        u8 elcr_mask;
  58        u8 isr_ack;     /* interrupt ack detection */
  59        struct kvm_pic *pics_state;
  60};
  61
  62struct kvm_pic {
  63        spinlock_t lock;
  64        bool wakeup_needed;
  65        unsigned pending_acks;
  66        struct kvm *kvm;
  67        struct kvm_kpic_state pics[2]; /* 0 is master pic, 1 is slave pic */
  68        int output;             /* intr from master PIC */
  69        struct kvm_io_device dev_master;
  70        struct kvm_io_device dev_slave;
  71        struct kvm_io_device dev_eclr;
  72        void (*ack_notifier)(void *opaque, int irq);
  73        unsigned long irq_states[PIC_NUM_PINS];
  74};
  75
  76int kvm_pic_init(struct kvm *kvm);
  77void kvm_pic_destroy(struct kvm *kvm);
  78int kvm_pic_read_irq(struct kvm *kvm);
  79void kvm_pic_update_irq(struct kvm_pic *s);
  80
  81static inline int pic_in_kernel(struct kvm *kvm)
  82{
  83        int mode = kvm->arch.irqchip_mode;
  84
  85        /* Matches smp_wmb() when setting irqchip_mode */
  86        smp_rmb();
  87        return mode == KVM_IRQCHIP_KERNEL;
  88}
  89
  90static inline int irqchip_split(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_SPLIT;
  97}
  98
  99static inline int irqchip_kernel(struct kvm *kvm)
 100{
 101        int mode = kvm->arch.irqchip_mode;
 102
 103        /* Matches smp_wmb() when setting irqchip_mode */
 104        smp_rmb();
 105        return mode == KVM_IRQCHIP_KERNEL;
 106}
 107
 108static inline int irqchip_in_kernel(struct kvm *kvm)
 109{
 110        int mode = kvm->arch.irqchip_mode;
 111
 112        /* Matches smp_wmb() when setting irqchip_mode */
 113        smp_rmb();
 114        return mode != KVM_IRQCHIP_NONE;
 115}
 116
 117void kvm_inject_pending_timer_irqs(struct kvm_vcpu *vcpu);
 118void kvm_inject_apic_timer_irqs(struct kvm_vcpu *vcpu);
 119void kvm_apic_nmi_wd_deliver(struct kvm_vcpu *vcpu);
 120void __kvm_migrate_apic_timer(struct kvm_vcpu *vcpu);
 121void __kvm_migrate_pit_timer(struct kvm_vcpu *vcpu);
 122void __kvm_migrate_timers(struct kvm_vcpu *vcpu);
 123
 124int apic_has_pending_timer(struct kvm_vcpu *vcpu);
 125
 126int kvm_setup_default_irq_routing(struct kvm *kvm);
 127int kvm_setup_empty_irq_routing(struct kvm *kvm);
 128
 129#endif
 130