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
  38 struct kvm;
  39 struct kvm_vcpu;
  40
  41 struct 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
  62 struct 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
  76 struct kvm_pic *kvm_create_pic(struct kvm *kvm);
  77 void kvm_destroy_pic(struct kvm_pic *vpic);
  78 int kvm_pic_read_irq(struct kvm *kvm);
  79 void kvm_pic_update_irq(struct kvm_pic *s);
  80
  81 static inline struct kvm_pic *pic_irqchip(struct kvm *kvm)
  82 {
  83         return kvm->arch.vpic;
  84 }
  85
  86 static inline int pic_in_kernel(struct kvm *kvm)
  87 {
  88         int ret;
  89
  90         ret = (pic_irqchip(kvm) != NULL);
  91         return ret;
  92 }
  93
  94 static inline int irqchip_split(struct kvm *kvm)
  95 {
  96         return kvm->arch.irqchip_split;
  97 }
  98
  99 static inline int irqchip_in_kernel(struct kvm *kvm)
 100 {
 101         struct kvm_pic *vpic = pic_irqchip(kvm);
 102         bool ret;
 103
 104         ret = (vpic != NULL);
 105         ret |= irqchip_split(kvm);
 106
 107         /* Read vpic before kvm->irq_routing.  */
 108         smp_rmb();
 109         return ret;
 110 }
 111
 112 void kvm_pic_reset(struct kvm_kpic_state *s);
 113
 114 void kvm_inject_pending_timer_irqs(struct kvm_vcpu *vcpu);
 115 void kvm_inject_apic_timer_irqs(struct kvm_vcpu *vcpu);
 116 void kvm_apic_nmi_wd_deliver(struct kvm_vcpu *vcpu);
 117 void __kvm_migrate_apic_timer(struct kvm_vcpu *vcpu);
 118 void __kvm_migrate_pit_timer(struct kvm_vcpu *vcpu);
 119 void __kvm_migrate_timers(struct kvm_vcpu *vcpu);
 120
 121 int apic_has_pending_timer(struct kvm_vcpu *vcpu);
 122
 123 #endif