linux-imx

/*

 * An implementation of file copy service.

 *

 * Copyright (C) 2014, Microsoft, Inc.

 *

 * Author : K. Y. Srinivasan <ksrinivasan@novell.com>

 *

 * This program is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 as published

 * by the Free Software Foundation.

 *

 * This program is distributed in the hope that it will be useful, but

 * WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or

 * NON INFRINGEMENT.  See the GNU General Public License for more

 * details.

 *

 */

​

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

​

#include <linux/nls.h>

#include <linux/workqueue.h>

#include <linux/hyperv.h>

#include <linux/sched.h>

​

#include "hyperv_vmbus.h"

#include "hv_utils_transport.h"

​

#define WIN8_SRV_MAJOR      1

#define WIN8_SRV_MINOR      1

#define WIN8_SRV_VERSION    (WIN8_SRV_MAJOR << 16 | WIN8_SRV_MINOR)

​

#define FCOPY_VER_COUNT 1

static const int fcopy_versions[] = {

    WIN8_SRV_VERSION

};

​

#define FW_VER_COUNT 1

static const int fw_versions[] = {

    UTIL_FW_VERSION

};

​

/*

 * Global state maintained for transaction that is being processed.

 * For a class of integration services, including the "file copy service",

 * the specified protocol is a "request/response" protocol which means that

 * there can only be single outstanding transaction from the host at any

 * given point in time. We use this to simplify memory management in this

 * driver - we cache and process only one message at a time.

 *

 * While the request/response protocol is guaranteed by the host, we further

 * ensure this by serializing packet processing in this driver - we do not

 * read additional packets from the VMBUs until the current packet is fully

 * handled.

 */

​

static struct {

    int state;   /* hvutil_device_state */

    int recv_len; /* number of bytes received. */

    struct hv_fcopy_hdr  *fcopy_msg; /* current message */

    struct vmbus_channel *recv_channel; /* chn we got the request */

    u64 recv_req_id; /* request ID. */