/* SPDX-License-Identifier: GPL-2.0-only */
/*
 * irqfd: Allows an fd to be used to inject an interrupt to the guest.
 * ioeventfd: Allow an fd to be used to receive a signal from the guest.
 * All credit goes to kvm developers.
 */

#ifndef __LINUX_MSHV_EVENTFD_H
#define __LINUX_MSHV_EVENTFD_H

#include <linux/poll.h>

#include "mshv.h"
#include "mshv_root.h"

/* struct to contain list of irqfds sharing an irq. Updates are protected by
 * partition.irqfds.resampler_lock
 */
struct mshv_irqfd_resampler {
        struct mshv_partition       *rsmplr_partn;
        struct hlist_head            rsmplr_irqfd_list;
        struct mshv_irq_ack_notifier rsmplr_notifier;
        struct hlist_node            rsmplr_hnode;
};

struct mshv_irqfd {
        struct mshv_partition               *irqfd_partn;
        struct eventfd_ctx                  *irqfd_eventfd_ctx;
        struct mshv_guest_irq_ent            irqfd_girq_ent;
        seqcount_spinlock_t                  irqfd_irqe_sc;
        u32                                  irqfd_irqnum;
        struct mshv_lapic_irq                irqfd_lapic_irq;
        struct hlist_node                    irqfd_hnode;
        poll_table                           irqfd_polltbl;
        wait_queue_entry_t                   irqfd_wait;
        struct work_struct                   irqfd_shutdown;
        struct mshv_irqfd_resampler         *irqfd_resampler;
        struct eventfd_ctx                  *irqfd_resamplefd;
        struct hlist_node                    irqfd_resampler_hnode;
};

void mshv_eventfd_init(struct mshv_partition *partition);
void mshv_eventfd_release(struct mshv_partition *partition);

void mshv_register_irq_ack_notifier(struct mshv_partition *partition,
                                    struct mshv_irq_ack_notifier *mian);
void mshv_unregister_irq_ack_notifier(struct mshv_partition *partition,
                                      struct mshv_irq_ack_notifier *mian);
bool mshv_notify_acked_gsi(struct mshv_partition *partition, int gsi);

int mshv_set_unset_irqfd(struct mshv_partition *partition,
                         struct mshv_user_irqfd *args);

int mshv_irqfd_wq_init(void);
void mshv_irqfd_wq_cleanup(void);

struct mshv_ioeventfd {
        struct hlist_node    iovntfd_hnode;
        u64                  iovntfd_addr;
        int                  iovntfd_length;
        struct eventfd_ctx  *iovntfd_eventfd;
        u64                  iovntfd_datamatch;
        int                  iovntfd_doorbell_id;
        bool                 iovntfd_wildcard;
};

int mshv_set_unset_ioeventfd(struct mshv_partition *pt,
                             struct mshv_user_ioeventfd *args);

#endif /* __LINUX_MSHV_EVENTFD_H */