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 
25 struct kvm;
26 struct kvm_vcpu;
27 
28 struct 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 
49 struct 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_eclr;
59 	void (*ack_notifier)(void *opaque, int irq);
60 	unsigned long irq_states[PIC_NUM_PINS];
61 };
62 
63 int kvm_pic_init(struct kvm *kvm);
64 void kvm_pic_destroy(struct kvm *kvm);
65 int kvm_pic_read_irq(struct kvm *kvm);
66 void kvm_pic_update_irq(struct kvm_pic *s);
67 
irqchip_split(struct kvm * kvm)68 static inline int irqchip_split(struct kvm *kvm)
69 {
70 	int mode = kvm->arch.irqchip_mode;
71 
72 	/* Matches smp_wmb() when setting irqchip_mode */
73 	smp_rmb();
74 	return mode == KVM_IRQCHIP_SPLIT;
75 }
76 
irqchip_kernel(struct kvm * kvm)77 static inline int irqchip_kernel(struct kvm *kvm)
78 {
79 	int mode = kvm->arch.irqchip_mode;
80 
81 	/* Matches smp_wmb() when setting irqchip_mode */
82 	smp_rmb();
83 	return mode == KVM_IRQCHIP_KERNEL;
84 }
85 
pic_in_kernel(struct kvm * kvm)86 static inline int pic_in_kernel(struct kvm *kvm)
87 {
88 	return irqchip_kernel(kvm);
89 }
90 
irqchip_in_kernel(struct kvm * kvm)91 static inline int irqchip_in_kernel(struct kvm *kvm)
92 {
93 	int mode = kvm->arch.irqchip_mode;
94 
95 	/* Matches smp_wmb() when setting irqchip_mode */
96 	smp_rmb();
97 	return mode != KVM_IRQCHIP_NONE;
98 }
99 
100 void kvm_inject_pending_timer_irqs(struct kvm_vcpu *vcpu);
101 void kvm_inject_apic_timer_irqs(struct kvm_vcpu *vcpu);
102 void kvm_apic_nmi_wd_deliver(struct kvm_vcpu *vcpu);
103 void __kvm_migrate_apic_timer(struct kvm_vcpu *vcpu);
104 void __kvm_migrate_pit_timer(struct kvm_vcpu *vcpu);
105 void __kvm_migrate_timers(struct kvm_vcpu *vcpu);
106 
107 int apic_has_pending_timer(struct kvm_vcpu *vcpu);
108 
109 int kvm_setup_default_irq_routing(struct kvm *kvm);
110 int kvm_setup_empty_irq_routing(struct kvm *kvm);
111 int kvm_irq_delivery_to_apic(struct kvm *kvm, struct kvm_lapic *src,
112 			     struct kvm_lapic_irq *irq,
113 			     struct dest_map *dest_map);
114 
115 #endif
116