a0aace5ac0
Document possible races between readers and concurrent update to the ioctl. Suggested-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Radim Krčmář <rkrcmar@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
66 lines
1.5 KiB
C
66 lines
1.5 KiB
C
#ifndef __I8254_H
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#define __I8254_H
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#include <linux/kthread.h>
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#include <kvm/iodev.h>
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struct kvm_kpit_channel_state {
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u32 count; /* can be 65536 */
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u16 latched_count;
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u8 count_latched;
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u8 status_latched;
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u8 status;
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u8 read_state;
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u8 write_state;
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u8 write_latch;
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u8 rw_mode;
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u8 mode;
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u8 bcd; /* not supported */
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u8 gate; /* timer start */
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ktime_t count_load_time;
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};
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struct kvm_kpit_state {
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/* All members before "struct mutex lock" are protected by the lock. */
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struct kvm_kpit_channel_state channels[3];
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u32 flags;
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bool is_periodic;
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s64 period; /* unit: ns */
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struct hrtimer timer;
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u32 speaker_data_on;
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struct mutex lock;
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atomic_t reinject;
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atomic_t pending; /* accumulated triggered timers */
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atomic_t irq_ack;
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struct kvm_irq_ack_notifier irq_ack_notifier;
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};
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struct kvm_pit {
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struct kvm_io_device dev;
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struct kvm_io_device speaker_dev;
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struct kvm *kvm;
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struct kvm_kpit_state pit_state;
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int irq_source_id;
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struct kvm_irq_mask_notifier mask_notifier;
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struct kthread_worker worker;
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struct task_struct *worker_task;
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struct kthread_work expired;
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};
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#define KVM_PIT_BASE_ADDRESS 0x40
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#define KVM_SPEAKER_BASE_ADDRESS 0x61
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#define KVM_PIT_MEM_LENGTH 4
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#define KVM_PIT_FREQ 1193181
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#define KVM_MAX_PIT_INTR_INTERVAL HZ / 100
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#define KVM_PIT_CHANNEL_MASK 0x3
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struct kvm_pit *kvm_create_pit(struct kvm *kvm, u32 flags);
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void kvm_free_pit(struct kvm *kvm);
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void kvm_pit_load_count(struct kvm_pit *pit, int channel, u32 val,
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int hpet_legacy_start);
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void kvm_pit_set_reinject(struct kvm_pit *pit, bool reinject);
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#endif
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