linux/drivers/virt/acrn/ioeventfd.c

// SPDX-License-Identifier: GPL-2.0
/*
 * ACRN HSM eventfd - use eventfd objects to signal expected I/O requests
 *
 * Copyright (C) 2020 Intel Corporation. All rights reserved.
 *
 * Authors:
 *	Shuo Liu <[email protected]>
 *	Yakui Zhao <[email protected]>
 */

#include <linux/eventfd.h>
#include <linux/slab.h>

#include "acrn_drv.h"

/**
 * struct hsm_ioeventfd - Properties of HSM ioeventfd
 * @list:	Entry within &acrn_vm.ioeventfds of ioeventfds of a VM
 * @eventfd:	Eventfd of the HSM ioeventfd
 * @addr:	Address of I/O range
 * @data:	Data for matching
 * @length:	Length of I/O range
 * @type:	Type of I/O range (ACRN_IOREQ_TYPE_MMIO/ACRN_IOREQ_TYPE_PORTIO)
 * @wildcard:	Data matching or not
 */
struct hsm_ioeventfd { … };

static inline int ioreq_type_from_flags(int flags)
{ … }

static void acrn_ioeventfd_shutdown(struct acrn_vm *vm, struct hsm_ioeventfd *p)
{ … }

static bool hsm_ioeventfd_is_conflict(struct acrn_vm *vm,
				      struct hsm_ioeventfd *ioeventfd)
{ … }

/*
 * Assign an eventfd to a VM and create a HSM ioeventfd associated with the
 * eventfd. The properties of the HSM ioeventfd are built from a &struct
 * acrn_ioeventfd.
 */
static int acrn_ioeventfd_assign(struct acrn_vm *vm,
				 struct acrn_ioeventfd *args)
{ … }

static int acrn_ioeventfd_deassign(struct acrn_vm *vm,
				   struct acrn_ioeventfd *args)
{ … }

static struct hsm_ioeventfd *hsm_ioeventfd_match(struct acrn_vm *vm, u64 addr,
						 u64 data, int len, int type)
{ … }

static int acrn_ioeventfd_handler(struct acrn_ioreq_client *client,
				  struct acrn_io_request *req)
{ … }

int acrn_ioeventfd_config(struct acrn_vm *vm, struct acrn_ioeventfd *args)
{ … }

int acrn_ioeventfd_init(struct acrn_vm *vm)
{ … }

void acrn_ioeventfd_deinit(struct acrn_vm *vm)
{ … }