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
25struct kvm;
26struct kvm_vcpu;
27
28struct 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
49struct 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
62int kvm_pic_init(struct kvm *kvm);
63void kvm_pic_destroy(struct kvm *kvm);
64int kvm_pic_read_irq(struct kvm *kvm);
65void kvm_pic_update_irq(struct kvm_pic *s);
66
67static 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
76static 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
85static inline int pic_in_kernel(struct kvm *kvm)
86{
87	return irqchip_kernel(kvm);
88}
89
90static 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
99void kvm_inject_pending_timer_irqs(struct kvm_vcpu *vcpu);
100void kvm_inject_apic_timer_irqs(struct kvm_vcpu *vcpu);
101void kvm_apic_nmi_wd_deliver(struct kvm_vcpu *vcpu);
102void __kvm_migrate_apic_timer(struct kvm_vcpu *vcpu);
103void __kvm_migrate_pit_timer(struct kvm_vcpu *vcpu);
104void __kvm_migrate_timers(struct kvm_vcpu *vcpu);
105
106int apic_has_pending_timer(struct kvm_vcpu *vcpu);
107
108int kvm_setup_default_irq_routing(struct kvm *kvm);
109int kvm_setup_empty_irq_routing(struct kvm *kvm);
110int kvm_irq_delivery_to_apic(struct kvm *kvm, struct kvm_lapic *src,
111			     struct kvm_lapic_irq *irq,
112			     struct dest_map *dest_map);
113
114#endif
115