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/*
* Inter-VM Shared Memory Flat Device
*
* SPDX-License-Identifier: GPL-2.0-or-later
* Copyright (c) 2023 Linaro Ltd.
* Authors:
* Gustavo Romero
*
*/
#ifndef IVSHMEM_FLAT_H
#define IVSHMEM_FLAT_H
#include "qemu/queue.h"
#include "qemu/event_notifier.h"
#include "chardev/char-fe.h"
#include "exec/memory.h"
#include "qom/object.h"
#include "hw/sysbus.h"
#define IVSHMEM_MAX_VECTOR_NUM 64
/*
* QEMU interface:
* + QOM property "chardev" is the character device id of the ivshmem server
* socket
* + QOM property "shmem-size" sets the size of the RAM region shared between
* the device and the ivshmem server
* + sysbus MMIO region 0: device I/O mapped registers
* + sysbus MMIO region 1: shared memory with ivshmem server
* + sysbus IRQ 0: single output interrupt
*/
#define TYPE_IVSHMEM_FLAT "ivshmem-flat"
typedef struct IvshmemFTState IvshmemFTState;
DECLARE_INSTANCE_CHECKER(IvshmemFTState, IVSHMEM_FLAT, TYPE_IVSHMEM_FLAT)
/* Ivshmem registers. See ./docs/specs/ivshmem-spec.txt for details. */
enum ivshmem_registers {
INTMASK = 0,
INTSTATUS = 4,
IVPOSITION = 8,
DOORBELL = 12,
};
typedef struct VectorInfo {
EventNotifier event_notifier;
uint16_t id;
} VectorInfo;
typedef struct IvshmemPeer {
QTAILQ_ENTRY(IvshmemPeer) next;
VectorInfo vector[IVSHMEM_MAX_VECTOR_NUM];
int vector_counter;
uint16_t id;
} IvshmemPeer;
struct IvshmemFTState {
SysBusDevice parent_obj;
uint64_t msg_buf;
int msg_buffered_bytes;
QTAILQ_HEAD(, IvshmemPeer) peer;
IvshmemPeer own;
CharBackend server_chr;
/* IRQ */
qemu_irq irq;
/* I/O registers */
MemoryRegion iomem;
uint32_t intmask;
uint32_t intstatus;
uint32_t ivposition;
uint32_t doorbell;
/* Shared memory */
MemoryRegion shmem;
int shmem_fd;
uint32_t shmem_size;
};
#endif /* IVSHMEM_FLAT_H */
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