xref: /openbmc/linux/arch/x86/kvm/irq.h (revision 22246614)
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 
29 #include "iodev.h"
30 #include "ioapic.h"
31 #include "lapic.h"
32 
33 struct kvm;
34 struct kvm_vcpu;
35 
36 typedef void irq_request_func(void *opaque, int level);
37 
38 struct kvm_kpic_state {
39 	u8 last_irr;	/* edge detection */
40 	u8 irr;		/* interrupt request register */
41 	u8 imr;		/* interrupt mask register */
42 	u8 isr;		/* interrupt service register */
43 	u8 priority_add;	/* highest irq priority */
44 	u8 irq_base;
45 	u8 read_reg_select;
46 	u8 poll;
47 	u8 special_mask;
48 	u8 init_state;
49 	u8 auto_eoi;
50 	u8 rotate_on_auto_eoi;
51 	u8 special_fully_nested_mode;
52 	u8 init4;		/* true if 4 byte init */
53 	u8 elcr;		/* PIIX edge/trigger selection */
54 	u8 elcr_mask;
55 	struct kvm_pic *pics_state;
56 };
57 
58 struct kvm_pic {
59 	struct kvm_kpic_state pics[2]; /* 0 is master pic, 1 is slave pic */
60 	irq_request_func *irq_request;
61 	void *irq_request_opaque;
62 	int output;		/* intr from master PIC */
63 	struct kvm_io_device dev;
64 };
65 
66 struct kvm_pic *kvm_create_pic(struct kvm *kvm);
67 void kvm_pic_set_irq(void *opaque, int irq, int level);
68 int kvm_pic_read_irq(struct kvm_pic *s);
69 void kvm_pic_update_irq(struct kvm_pic *s);
70 
71 static inline struct kvm_pic *pic_irqchip(struct kvm *kvm)
72 {
73 	return kvm->arch.vpic;
74 }
75 
76 static inline int irqchip_in_kernel(struct kvm *kvm)
77 {
78 	return pic_irqchip(kvm) != NULL;
79 }
80 
81 void kvm_pic_reset(struct kvm_kpic_state *s);
82 
83 void kvm_timer_intr_post(struct kvm_vcpu *vcpu, int vec);
84 void kvm_inject_pending_timer_irqs(struct kvm_vcpu *vcpu);
85 void kvm_inject_apic_timer_irqs(struct kvm_vcpu *vcpu);
86 void __kvm_migrate_apic_timer(struct kvm_vcpu *vcpu);
87 
88 int pit_has_pending_timer(struct kvm_vcpu *vcpu);
89 int apic_has_pending_timer(struct kvm_vcpu *vcpu);
90 
91 #endif
92