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
pic_irqchip(struct kvm * kvm)81 static inline struct kvm_pic *pic_irqchip(struct kvm *kvm)
82 {
83 return kvm->arch.vpic;
84 }
85
pic_in_kernel(struct kvm * kvm)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
irqchip_split(struct kvm * kvm)94 static inline int irqchip_split(struct kvm *kvm)
95 {
96 return kvm->arch.irqchip_split;
97 }
98
irqchip_in_kernel(struct kvm * kvm)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
lapic_in_kernel(struct kvm_vcpu * vcpu)112 static 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
120 void kvm_pic_reset(struct kvm_kpic_state *s);
121
122 void kvm_inject_pending_timer_irqs(struct kvm_vcpu *vcpu);
123 void kvm_inject_apic_timer_irqs(struct kvm_vcpu *vcpu);
124 void kvm_apic_nmi_wd_deliver(struct kvm_vcpu *vcpu);
125 void __kvm_migrate_apic_timer(struct kvm_vcpu *vcpu);
126 void __kvm_migrate_pit_timer(struct kvm_vcpu *vcpu);
127 void __kvm_migrate_timers(struct kvm_vcpu *vcpu);
128
129 int apic_has_pending_timer(struct kvm_vcpu *vcpu);
130
131 #endif
132