1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef __I8254_H 3 #define __I8254_H 4 5 #include <linux/kthread.h> 6 7 #include <kvm/iodev.h> 8 9 #include <uapi/asm/kvm.h> 10 11 #include "ioapic.h" 12 13 #ifdef CONFIG_KVM_IOAPIC 14 struct kvm_kpit_channel_state { 15 u32 count; /* can be 65536 */ 16 u16 latched_count; 17 u8 count_latched; 18 u8 status_latched; 19 u8 status; 20 u8 read_state; 21 u8 write_state; 22 u8 write_latch; 23 u8 rw_mode; 24 u8 mode; 25 u8 bcd; /* not supported */ 26 u8 gate; /* timer start */ 27 ktime_t count_load_time; 28 }; 29 30 struct kvm_kpit_state { 31 /* All members before "struct mutex lock" are protected by the lock. */ 32 struct kvm_kpit_channel_state channels[3]; 33 u32 flags; 34 bool is_periodic; 35 s64 period; /* unit: ns */ 36 struct hrtimer timer; 37 38 struct mutex lock; 39 atomic_t reinject; 40 atomic_t pending; /* accumulated triggered timers */ 41 atomic_t irq_ack; 42 struct kvm_irq_ack_notifier irq_ack_notifier; 43 }; 44 45 struct kvm_pit { 46 struct kvm_io_device dev; 47 struct kvm_io_device speaker_dev; 48 struct kvm *kvm; 49 struct kvm_kpit_state pit_state; 50 struct kvm_irq_mask_notifier mask_notifier; 51 struct kthread_worker *worker; 52 struct kthread_work expired; 53 }; 54 55 #define KVM_PIT_BASE_ADDRESS 0x40 56 #define KVM_SPEAKER_BASE_ADDRESS 0x61 57 #define KVM_PIT_MEM_LENGTH 4 58 #define KVM_PIT_FREQ 1193181 59 #define KVM_MAX_PIT_INTR_INTERVAL HZ / 100 60 #define KVM_PIT_CHANNEL_MASK 0x3 61 62 int kvm_vm_ioctl_get_pit(struct kvm *kvm, struct kvm_pit_state *ps); 63 int kvm_vm_ioctl_set_pit(struct kvm *kvm, struct kvm_pit_state *ps); 64 int kvm_vm_ioctl_get_pit2(struct kvm *kvm, struct kvm_pit_state2 *ps); 65 int kvm_vm_ioctl_set_pit2(struct kvm *kvm, struct kvm_pit_state2 *ps); 66 int kvm_vm_ioctl_reinject(struct kvm *kvm, struct kvm_reinject_control *control); 67 68 struct kvm_pit *kvm_create_pit(struct kvm *kvm, u32 flags); 69 void kvm_free_pit(struct kvm *kvm); 70 #endif /* CONFIG_KVM_IOAPIC */ 71 72 #endif 73