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Eddie Dong85f455f2007-07-06 12:20:49 +03001/*
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
Hollis Blancharde01a1b52007-12-03 15:30:25 -060025#include <linux/mm_types.h>
26#include <linux/hrtimer.h>
Avi Kivityedf88412007-12-16 11:02:48 +020027#include <linux/kvm_host.h>
Avi Kivity3f353852008-12-21 22:48:32 +020028#include <linux/spinlock.h>
Zhang Xiantao82470192007-12-17 13:59:56 +080029
Andre Przywaraaf669ac2015-03-26 14:39:29 +000030#include <kvm/iodev.h>
Zhang Xiantao82470192007-12-17 13:59:56 +080031#include "ioapic.h"
32#include "lapic.h"
Eddie Dong85f455f2007-07-06 12:20:49 +030033
Ben-Ami Yassourc65bbfa2008-07-06 17:15:07 +030034#define PIC_NUM_PINS 16
Marcelo Tosatti44882ee2009-01-27 15:12:38 -020035#define SELECT_PIC(irq) \
36 ((irq) < 8 ? KVM_IRQCHIP_PIC_MASTER : KVM_IRQCHIP_PIC_SLAVE)
Ben-Ami Yassourc65bbfa2008-07-06 17:15:07 +030037
Hollis Blancharde01a1b52007-12-03 15:30:25 -060038struct kvm;
39struct kvm_vcpu;
40
Eddie Dong85f455f2007-07-06 12:20:49 +030041struct 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;
Gleb Natapoveebb5f32010-08-30 12:49:13 +030058 u8 isr_ack; /* interrupt ack detection */
Eddie Dong85f455f2007-07-06 12:20:49 +030059 struct kvm_pic *pics_state;
60};
61
62struct kvm_pic {
Avi Kivityf4f51052010-09-19 18:44:07 +020063 spinlock_t lock;
Jan Kiszka50a085b2010-02-24 10:41:58 +010064 bool wakeup_needed;
Avi Kivity3f353852008-12-21 22:48:32 +020065 unsigned pending_acks;
66 struct kvm *kvm;
Eddie Dong85f455f2007-07-06 12:20:49 +030067 struct kvm_kpic_state pics[2]; /* 0 is master pic, 1 is slave pic */
Eddie Dong85f455f2007-07-06 12:20:49 +030068 int output; /* intr from master PIC */
Sasha Levin743eeb02011-07-27 16:00:48 +030069 struct kvm_io_device dev_master;
70 struct kvm_io_device dev_slave;
71 struct kvm_io_device dev_eclr;
Marcelo Tosattif5244722008-07-26 17:01:00 -030072 void (*ack_notifier)(void *opaque, int irq);
Michael S. Tsirkin93b65472012-07-19 13:55:53 +030073 unsigned long irq_states[PIC_NUM_PINS];
Eddie Dong85f455f2007-07-06 12:20:49 +030074};
75
76struct kvm_pic *kvm_create_pic(struct kvm *kvm);
Paolo Bonzini71ba9942015-07-29 12:31:15 +020077void kvm_destroy_pic(struct kvm_pic *vpic);
Marcelo Tosattif5244722008-07-26 17:01:00 -030078int kvm_pic_read_irq(struct kvm *kvm);
He, Qing6ceb9d72007-07-26 11:05:18 +030079void kvm_pic_update_irq(struct kvm_pic *s);
Eddie Dong85f455f2007-07-06 12:20:49 +030080
Zhang Xiantao682c59a2007-12-11 20:36:00 +080081static inline struct kvm_pic *pic_irqchip(struct kvm *kvm)
82{
Zhang Xiantaod7deeeb02007-12-14 10:17:34 +080083 return kvm->arch.vpic;
Zhang Xiantao682c59a2007-12-11 20:36:00 +080084}
85
Steve Rutherford1c1a9ce2015-07-30 11:27:16 +020086static inline int pic_in_kernel(struct kvm *kvm)
87{
88 int ret;
89
90 ret = (pic_irqchip(kvm) != NULL);
91 return ret;
92}
93
Steve Rutherford49df6392015-07-29 23:21:40 -070094static inline int irqchip_split(struct kvm *kvm)
95{
96 return kvm->arch.irqchip_split;
97}
98
Zhang Xiantao682c59a2007-12-11 20:36:00 +080099static inline int irqchip_in_kernel(struct kvm *kvm)
100{
Paolo Bonzini71ba9942015-07-29 12:31:15 +0200101 struct kvm_pic *vpic = pic_irqchip(kvm);
Steve Rutherford49df6392015-07-29 23:21:40 -0700102 bool ret;
103
104 ret = (vpic != NULL);
105 ret |= irqchip_split(kvm);
Marcelo Tosatti3ddea122009-10-29 13:44:15 -0200106
Paolo Bonzini71ba9942015-07-29 12:31:15 +0200107 /* Read vpic before kvm->irq_routing. */
Marcelo Tosatti3ddea122009-10-29 13:44:15 -0200108 smp_rmb();
Steve Rutherford49df6392015-07-29 23:21:40 -0700109 return ret;
Zhang Xiantao682c59a2007-12-11 20:36:00 +0800110}
111
Paolo Bonzini35754c92015-07-29 12:05:37 +0200112static inline int lapic_in_kernel(struct kvm_vcpu *vcpu)
113{
114 /* Same as irqchip_in_kernel(vcpu->kvm), but with less
115 * pointer chasing and no unnecessary memory barriers.
116 */
117 return vcpu->arch.apic != NULL;
118}
119
Eddie Dong2fcceae2007-10-10 12:14:25 +0200120void kvm_pic_reset(struct kvm_kpic_state *s);
Zhang Xiantao8be54532007-12-02 22:35:57 +0800121
Eddie Dong1b9778d2007-09-03 16:56:58 +0300122void kvm_inject_pending_timer_irqs(struct kvm_vcpu *vcpu);
123void kvm_inject_apic_timer_irqs(struct kvm_vcpu *vcpu);
Jan Kiszka8fdb2352008-10-20 10:20:02 +0200124void kvm_apic_nmi_wd_deliver(struct kvm_vcpu *vcpu);
Avi Kivity2f52d582008-01-16 12:49:30 +0200125void __kvm_migrate_apic_timer(struct kvm_vcpu *vcpu);
Marcelo Tosatti2f599712008-05-27 12:10:20 -0300126void __kvm_migrate_pit_timer(struct kvm_vcpu *vcpu);
127void __kvm_migrate_timers(struct kvm_vcpu *vcpu);
Eddie Dong97222cc2007-09-12 10:58:04 +0300128
Marcelo Tosatti3d808402008-04-11 14:53:26 -0300129int apic_has_pending_timer(struct kvm_vcpu *vcpu);
130
Eddie Dong85f455f2007-07-06 12:20:49 +0300131#endif