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 27 struct kvm; 28 struct kvm_vcpu; 29 30 struct 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 51 struct 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 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 int 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 71 int kvm_setup_default_ioapic_and_pic_routing(struct kvm *kvm); 72 73 int kvm_vm_ioctl_get_irqchip(struct kvm *kvm, struct kvm_irqchip *chip); 74 int kvm_vm_ioctl_set_irqchip(struct kvm *kvm, struct kvm_irqchip *chip); 75 76 static 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 */ 85 static __always_inline int irqchip_full(struct kvm *kvm) 86 { 87 return false; 88 } 89 #endif 90 91 static inline int pic_in_kernel(struct kvm *kvm) 92 { 93 return irqchip_full(kvm); 94 } 95 96 97 static 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 } 105 106 static 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 } 114 115 void kvm_inject_pending_timer_irqs(struct kvm_vcpu *vcpu); 116 void kvm_inject_apic_timer_irqs(struct kvm_vcpu *vcpu); 117 void kvm_apic_nmi_wd_deliver(struct kvm_vcpu *vcpu); 118 void __kvm_migrate_apic_timer(struct kvm_vcpu *vcpu); 119 void __kvm_migrate_pit_timer(struct kvm_vcpu *vcpu); 120 void __kvm_migrate_timers(struct kvm_vcpu *vcpu); 121 122 int apic_has_pending_timer(struct kvm_vcpu *vcpu); 123 124 int kvm_irq_delivery_to_apic(struct kvm *kvm, struct kvm_lapic *src, 125 struct kvm_lapic_irq *irq, 126 struct dest_map *dest_map); 127 128 #endif 129