xref: /openbmc/linux/arch/x86/kvm/irq.h (revision 03ab8e6297acd1bc0eedaa050e2a1635c576fd11)
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_elcr;
59  	unsigned long irq_states[PIC_NUM_PINS];
60  };
61  
62  int kvm_pic_init(struct kvm *kvm);
63  void kvm_pic_destroy(struct kvm *kvm);
64  int kvm_pic_read_irq(struct kvm *kvm);
65  void kvm_pic_update_irq(struct kvm_pic *s);
66  
irqchip_split(struct kvm * kvm)67  static 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  
irqchip_kernel(struct kvm * kvm)76  static 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  
pic_in_kernel(struct kvm * kvm)85  static inline int pic_in_kernel(struct kvm *kvm)
86  {
87  	return irqchip_kernel(kvm);
88  }
89  
irqchip_in_kernel(struct kvm * kvm)90  static 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  
99  void kvm_inject_pending_timer_irqs(struct kvm_vcpu *vcpu);
100  void kvm_inject_apic_timer_irqs(struct kvm_vcpu *vcpu);
101  void kvm_apic_nmi_wd_deliver(struct kvm_vcpu *vcpu);
102  void __kvm_migrate_apic_timer(struct kvm_vcpu *vcpu);
103  void __kvm_migrate_pit_timer(struct kvm_vcpu *vcpu);
104  void __kvm_migrate_timers(struct kvm_vcpu *vcpu);
105  
106  int apic_has_pending_timer(struct kvm_vcpu *vcpu);
107  
108  int kvm_setup_default_irq_routing(struct kvm *kvm);
109  int kvm_setup_empty_irq_routing(struct kvm *kvm);
110  int 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