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Marc-André Lureau
1b21518f73
The actual backend is "Chardev", CharBackend is the frontend side of it (whatever talks to the backend), let's rename it for readability. Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com> Link: https://lore.kernel.org/r/20251022074612.1258413-1-marcandre.lureau@redhat.com Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
87 lines
1.9 KiB
C
87 lines
1.9 KiB
C
/*
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* Inter-VM Shared Memory Flat Device
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*
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* SPDX-License-Identifier: GPL-2.0-or-later
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* Copyright (c) 2023 Linaro Ltd.
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* Authors:
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* Gustavo Romero
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*
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*/
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#ifndef IVSHMEM_FLAT_H
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#define IVSHMEM_FLAT_H
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#include "qemu/queue.h"
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#include "qemu/event_notifier.h"
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#include "chardev/char-fe.h"
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#include "system/memory.h"
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#include "qom/object.h"
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#include "hw/sysbus.h"
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#define IVSHMEM_MAX_VECTOR_NUM 64
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/*
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* QEMU interface:
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* + QOM property "chardev" is the character device id of the ivshmem server
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* socket
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* + QOM property "shmem-size" sets the size of the RAM region shared between
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* the device and the ivshmem server
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* + sysbus MMIO region 0: device I/O mapped registers
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* + sysbus MMIO region 1: shared memory with ivshmem server
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* + sysbus IRQ 0: single output interrupt
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*/
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#define TYPE_IVSHMEM_FLAT "ivshmem-flat"
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typedef struct IvshmemFTState IvshmemFTState;
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DECLARE_INSTANCE_CHECKER(IvshmemFTState, IVSHMEM_FLAT, TYPE_IVSHMEM_FLAT)
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/* Ivshmem registers. See docs/specs/ivshmem-spec.rst for details. */
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enum ivshmem_registers {
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INTMASK = 0,
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INTSTATUS = 4,
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IVPOSITION = 8,
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DOORBELL = 12,
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};
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typedef struct VectorInfo {
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EventNotifier event_notifier;
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uint16_t id;
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} VectorInfo;
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typedef struct IvshmemPeer {
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QTAILQ_ENTRY(IvshmemPeer) next;
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VectorInfo vector[IVSHMEM_MAX_VECTOR_NUM];
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int vector_counter;
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uint16_t id;
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} IvshmemPeer;
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struct IvshmemFTState {
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SysBusDevice parent_obj;
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uint64_t msg_buf;
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int msg_buffered_bytes;
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QTAILQ_HEAD(, IvshmemPeer) peer;
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IvshmemPeer own;
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CharFrontend server_chr;
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/* IRQ */
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qemu_irq irq;
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/* I/O registers */
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MemoryRegion iomem;
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uint32_t intmask;
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uint32_t intstatus;
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uint32_t ivposition;
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uint32_t doorbell;
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/* Shared memory */
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MemoryRegion shmem;
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int shmem_fd;
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uint32_t shmem_size;
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};
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#endif /* IVSHMEM_FLAT_H */
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