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 "ioapic.h" 20 #include "lapic.h" 21 22 #define PIC_NUM_PINS 16 23 #define SELECT_PIC(irq) \ 24 ((irq) < 8 ? KVM_IRQCHIP_PIC_MASTER : KVM_IRQCHIP_PIC_SLAVE) 25 26 struct kvm; 27 struct kvm_vcpu; 28 29 struct kvm_kpic_state { 30 u8 last_irr; /* edge detection */ 31 u8 irr; /* interrupt request register */ 32 u8 imr; /* interrupt mask register */ 33 u8 isr; /* interrupt service register */ 34 u8 priority_add; /* highest irq priority */ 35 u8 irq_base; 36 u8 read_reg_select; 37 u8 poll; 38 u8 special_mask; 39 u8 init_state; 40 u8 auto_eoi; 41 u8 rotate_on_auto_eoi; 42 u8 special_fully_nested_mode; 43 u8 init4; /* true if 4 byte init */ 44 u8 elcr; /* PIIX edge/trigger selection */ 45 u8 elcr_mask; 46 u8 isr_ack; /* interrupt ack detection */ 47 struct kvm_pic *pics_state; 48 }; 49 50 struct kvm_pic { 51 spinlock_t lock; 52 bool wakeup_needed; 53 unsigned pending_acks; 54 struct kvm *kvm; 55 struct kvm_kpic_state pics[2]; /* 0 is master pic, 1 is slave pic */ 56 int output; /* intr from master PIC */ 57 struct kvm_io_device dev_master; 58 struct kvm_io_device dev_slave; 59 struct kvm_io_device dev_eclr; 60 void (*ack_notifier)(void *opaque, int irq); 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 69 static inline int pic_in_kernel(struct kvm *kvm) 70 { 71 int mode = kvm->arch.irqchip_mode; 72 73 /* Matches smp_wmb() when setting irqchip_mode */ 74 smp_rmb(); 75 return mode == KVM_IRQCHIP_KERNEL; 76 } 77 78 static inline int irqchip_split(struct kvm *kvm) 79 { 80 int mode = kvm->arch.irqchip_mode; 81 82 /* Matches smp_wmb() when setting irqchip_mode */ 83 smp_rmb(); 84 return mode == KVM_IRQCHIP_SPLIT; 85 } 86 87 static inline int irqchip_kernel(struct kvm *kvm) 88 { 89 int mode = kvm->arch.irqchip_mode; 90 91 /* Matches smp_wmb() when setting irqchip_mode */ 92 smp_rmb(); 93 return mode == KVM_IRQCHIP_KERNEL; 94 } 95 96 static inline int irqchip_in_kernel(struct kvm *kvm) 97 { 98 int mode = kvm->arch.irqchip_mode; 99 100 /* Matches smp_wmb() when setting irqchip_mode */ 101 smp_rmb(); 102 return mode != KVM_IRQCHIP_NONE; 103 } 104 105 bool kvm_arch_irqfd_allowed(struct kvm *kvm, struct kvm_irqfd *args); 106 void kvm_inject_pending_timer_irqs(struct kvm_vcpu *vcpu); 107 void kvm_inject_apic_timer_irqs(struct kvm_vcpu *vcpu); 108 void kvm_apic_nmi_wd_deliver(struct kvm_vcpu *vcpu); 109 void __kvm_migrate_apic_timer(struct kvm_vcpu *vcpu); 110 void __kvm_migrate_pit_timer(struct kvm_vcpu *vcpu); 111 void __kvm_migrate_timers(struct kvm_vcpu *vcpu); 112 113 int apic_has_pending_timer(struct kvm_vcpu *vcpu); 114 115 int kvm_setup_default_irq_routing(struct kvm *kvm); 116 int kvm_setup_empty_irq_routing(struct kvm *kvm); 117 118 #endif 119