• Home
  • Line#
  • Scopes#
  • Navigate#
  • Raw
  • Download
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 #include <linux/spinlock.h>
29 
30 #include <kvm/iodev.h>
31 #include "ioapic.h"
32 #include "lapic.h"
33 
34 #define PIC_NUM_PINS 16
35 #define SELECT_PIC(irq) \
36 	((irq) < 8 ? KVM_IRQCHIP_PIC_MASTER : KVM_IRQCHIP_PIC_SLAVE)
37 
38 struct kvm;
39 struct kvm_vcpu;
40 
41 struct kvm_kpic_state {
42 	u8 last_irr;	/* edge detection */
43 	u8 irr;		/* interrupt request register */
44 	u8 imr;		/* interrupt mask register */
45 	u8 isr;		/* interrupt service register */
46 	u8 priority_add;	/* highest irq priority */
47 	u8 irq_base;
48 	u8 read_reg_select;
49 	u8 poll;
50 	u8 special_mask;
51 	u8 init_state;
52 	u8 auto_eoi;
53 	u8 rotate_on_auto_eoi;
54 	u8 special_fully_nested_mode;
55 	u8 init4;		/* true if 4 byte init */
56 	u8 elcr;		/* PIIX edge/trigger selection */
57 	u8 elcr_mask;
58 	u8 isr_ack;	/* interrupt ack detection */
59 	struct kvm_pic *pics_state;
60 };
61 
62 struct kvm_pic {
63 	spinlock_t lock;
64 	bool wakeup_needed;
65 	unsigned pending_acks;
66 	struct kvm *kvm;
67 	struct kvm_kpic_state pics[2]; /* 0 is master pic, 1 is slave pic */
68 	int output;		/* intr from master PIC */
69 	struct kvm_io_device dev_master;
70 	struct kvm_io_device dev_slave;
71 	struct kvm_io_device dev_eclr;
72 	void (*ack_notifier)(void *opaque, int irq);
73 	unsigned long irq_states[PIC_NUM_PINS];
74 };
75 
76 struct kvm_pic *kvm_create_pic(struct kvm *kvm);
77 void kvm_destroy_pic(struct kvm_pic *vpic);
78 int kvm_pic_read_irq(struct kvm *kvm);
79 void kvm_pic_update_irq(struct kvm_pic *s);
80 
pic_irqchip(struct kvm * kvm)81 static inline struct kvm_pic *pic_irqchip(struct kvm *kvm)
82 {
83 	return kvm->arch.vpic;
84 }
85 
pic_in_kernel(struct kvm * kvm)86 static inline int pic_in_kernel(struct kvm *kvm)
87 {
88 	int ret;
89 
90 	ret = (pic_irqchip(kvm) != NULL);
91 	return ret;
92 }
93 
irqchip_split(struct kvm * kvm)94 static inline int irqchip_split(struct kvm *kvm)
95 {
96 	return kvm->arch.irqchip_split;
97 }
98 
irqchip_in_kernel(struct kvm * kvm)99 static inline int irqchip_in_kernel(struct kvm *kvm)
100 {
101 	struct kvm_pic *vpic = pic_irqchip(kvm);
102 	bool ret;
103 
104 	ret = (vpic != NULL);
105 	ret |= irqchip_split(kvm);
106 
107 	/* Read vpic before kvm->irq_routing.  */
108 	smp_rmb();
109 	return ret;
110 }
111 
lapic_in_kernel(struct kvm_vcpu * vcpu)112 static inline int lapic_in_kernel(struct kvm_vcpu *vcpu)
113 {
114 	/* Same as irqchip_in_kernel(vcpu->kvm), but with less
115 	 * pointer chasing and no unnecessary memory barriers.
116 	 */
117 	return vcpu->arch.apic != NULL;
118 }
119 
120 void kvm_pic_reset(struct kvm_kpic_state *s);
121 
122 void kvm_inject_pending_timer_irqs(struct kvm_vcpu *vcpu);
123 void kvm_inject_apic_timer_irqs(struct kvm_vcpu *vcpu);
124 void kvm_apic_nmi_wd_deliver(struct kvm_vcpu *vcpu);
125 void __kvm_migrate_apic_timer(struct kvm_vcpu *vcpu);
126 void __kvm_migrate_pit_timer(struct kvm_vcpu *vcpu);
127 void __kvm_migrate_timers(struct kvm_vcpu *vcpu);
128 
129 int apic_has_pending_timer(struct kvm_vcpu *vcpu);
130 
131 #endif
132