irq.h

  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
 27struct kvm;
 28struct kvm_vcpu;
 29
 30struct 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
 51struct 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
 64int kvm_pic_init(struct kvm *kvm);
 65void kvm_pic_destroy(struct kvm *kvm);
 66int kvm_pic_read_irq(struct kvm *kvm);
 67void kvm_pic_update_irq(struct kvm_pic *s);
 68int 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
 71int kvm_setup_default_ioapic_and_pic_routing(struct kvm *kvm);
 72
 73int kvm_vm_ioctl_get_irqchip(struct kvm *kvm, struct kvm_irqchip *chip);
 74int kvm_vm_ioctl_set_irqchip(struct kvm *kvm, struct kvm_irqchip *chip);
 75
 76static 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 */
 85static __always_inline int irqchip_full(struct kvm *kvm)
 86{
 87	return false;
 88}
 89#endif
 90
 91static inline int pic_in_kernel(struct kvm *kvm)
 92{
 93	return irqchip_full(kvm);
 94}
 95
 96
 97static 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
106static 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
115void kvm_inject_pending_timer_irqs(struct kvm_vcpu *vcpu);
116void kvm_inject_apic_timer_irqs(struct kvm_vcpu *vcpu);
117void kvm_apic_nmi_wd_deliver(struct kvm_vcpu *vcpu);
118void __kvm_migrate_apic_timer(struct kvm_vcpu *vcpu);
119void __kvm_migrate_pit_timer(struct kvm_vcpu *vcpu);
120void __kvm_migrate_timers(struct kvm_vcpu *vcpu);
121
122int apic_has_pending_timer(struct kvm_vcpu *vcpu);
123
124#endif