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 #ifdef CONFIG_KVM_IOAPIC
22
23 #define PIC_NUM_PINS 16
24 #define SELECT_PIC(irq) \
25 ((irq) < 8 ? KVM_IRQCHIP_PIC_MASTER : KVM_IRQCHIP_PIC_SLAVE)
26
27 struct kvm;
28 struct kvm_vcpu;
29
30 struct kvm_kpic_state {
31 u8 last_irr; /* edge detection */
32 u8 irr; /* interrupt request register */
33 u8 imr; /* interrupt mask register */
34 u8 isr; /* interrupt service register */
35 u8 priority_add; /* highest irq priority */
36 u8 irq_base;
37 u8 read_reg_select;
38 u8 poll;
39 u8 special_mask;
40 u8 init_state;
41 u8 auto_eoi;
42 u8 rotate_on_auto_eoi;
43 u8 special_fully_nested_mode;
44 u8 init4; /* true if 4 byte init */
45 u8 elcr; /* PIIX edge/trigger selection */
46 u8 elcr_mask;
47 u8 isr_ack; /* interrupt ack detection */
48 struct kvm_pic *pics_state;
49 };
50
51 struct kvm_pic {
52 spinlock_t lock;
53 bool wakeup_needed;
54 unsigned pending_acks;
55 struct kvm *kvm;
56 struct kvm_kpic_state pics[2]; /* 0 is master pic, 1 is slave pic */
57 int output; /* intr from master PIC */
58 struct kvm_io_device dev_master;
59 struct kvm_io_device dev_slave;
60 struct kvm_io_device dev_elcr;
61 unsigned long irq_states[PIC_NUM_PINS];
62 };
63
64 int kvm_pic_init(struct kvm *kvm);
65 void kvm_pic_destroy(struct kvm *kvm);
66 int kvm_pic_read_irq(struct kvm *kvm);
67 void kvm_pic_update_irq(struct kvm_pic *s);
68 int kvm_pic_set_irq(struct kvm_kernel_irq_routing_entry *e, struct kvm *kvm,
69 int irq_source_id, int level, bool line_status);
70
71 int kvm_setup_default_ioapic_and_pic_routing(struct kvm *kvm);
72
73 int kvm_vm_ioctl_get_irqchip(struct kvm *kvm, struct kvm_irqchip *chip);
74 int kvm_vm_ioctl_set_irqchip(struct kvm *kvm, struct kvm_irqchip *chip);
75
irqchip_full(struct kvm * kvm)76 static inline int irqchip_full(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 #else /* CONFIG_KVM_IOAPIC */
irqchip_full(struct kvm * kvm)85 static __always_inline int irqchip_full(struct kvm *kvm)
86 {
87 return false;
88 }
89 #endif
90
pic_in_kernel(struct kvm * kvm)91 static inline int pic_in_kernel(struct kvm *kvm)
92 {
93 return irqchip_full(kvm);
94 }
95
96
irqchip_split(struct kvm * kvm)97 static inline int irqchip_split(struct kvm *kvm)
98 {
99 int mode = kvm->arch.irqchip_mode;
100
101 /* Matches smp_wmb() when setting irqchip_mode */
102 smp_rmb();
103 return mode == KVM_IRQCHIP_SPLIT;
104 }
105
irqchip_in_kernel(struct kvm * kvm)106 static inline int irqchip_in_kernel(struct kvm *kvm)
107 {
108 int mode = kvm->arch.irqchip_mode;
109
110 /* Matches smp_wmb() when setting irqchip_mode */
111 smp_rmb();
112 return mode != KVM_IRQCHIP_NONE;
113 }
114
115 void kvm_inject_pending_timer_irqs(struct kvm_vcpu *vcpu);
116 void kvm_inject_apic_timer_irqs(struct kvm_vcpu *vcpu);
117 void kvm_apic_nmi_wd_deliver(struct kvm_vcpu *vcpu);
118 void __kvm_migrate_apic_timer(struct kvm_vcpu *vcpu);
119 void __kvm_migrate_pit_timer(struct kvm_vcpu *vcpu);
120 void __kvm_migrate_timers(struct kvm_vcpu *vcpu);
121
122 int apic_has_pending_timer(struct kvm_vcpu *vcpu);
123
124 int kvm_irq_delivery_to_apic(struct kvm *kvm, struct kvm_lapic *src,
125 struct kvm_lapic_irq *irq,
126 struct dest_map *dest_map);
127
128 #endif
129