// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Virtio vhost-user driver
*
* Copyright(c) 2019 Intel Corporation
*
* This driver allows virtio devices to be used over a vhost-user socket.
*
* Guest devices can be instantiated by kernel module or command line
* parameters. One device will be created for each parameter. Syntax:
*
* virtio_uml.device=<socket>:<virtio_id>[:<platform_id>]
* where:
* <socket> := vhost-user socket path to connect
* <virtio_id> := virtio device id (as in virtio_ids.h)
* <platform_id> := (optional) platform device id
*
* example:
* virtio_uml.device=/var/uml.socket:1
*
* Based on Virtio MMIO driver by Pawel Moll, copyright 2011-2014, ARM Ltd.
*/
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/virtio.h>
#include <linux/virtio_config.h>
#include <linux/virtio_ring.h>
#include <linux/time-internal.h>
#include <linux/virtio-uml.h>
#include <shared/as-layout.h>
#include <irq_kern.h>
#include <init.h>
#include <os.h>
#include "vhost_user.h"
#define MAX_SUPPORTED_QUEUE_SIZE 256
#define to_virtio_uml_device(_vdev) \
container_of(_vdev, struct virtio_uml_device, vdev)
struct virtio_uml_platform_data {
u32 virtio_device_id;
const char *socket_path;
struct work_struct conn_broken_wk;
struct platform_device *pdev;
};
struct virtio_uml_device {
struct virtio_device vdev;
struct platform_device *pdev;
struct virtio_uml_platform_data *pdata;
spinlock_t sock_lock;
int sock, req_fd, irq;
u64 features;
u64 protocol_features;
u8 status;
u8 registered:1;
u8 suspended:1;
u8 no_vq_suspend:1;
u8 config_changed_irq:1;
uint64_t 