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/*-
* Copyright (c) 2014,2016 Microsoft Corp.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice unmodified, this list of conditions, and the following
* disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* $FreeBSD$
*/
/*
* A common driver for all hyper-V util services.
*/
#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/bus.h>
#include <sys/malloc.h>
#include <sys/module.h>
#include <sys/reboot.h>
#include <sys/timetc.h>
#include <sys/syscallsubr.h>
#include <dev/hyperv/include/hyperv.h>
#include <dev/hyperv/include/vmbus.h>
#include <dev/hyperv/utilities/hv_utilreg.h>
#include "hv_util.h"
#define VMBUS_IC_BRSIZE (4 * PAGE_SIZE)
void
hv_negotiate_version(struct hv_vmbus_icmsg_hdr *icmsghdrp, uint8_t *buf)
{
struct hv_vmbus_icmsg_negotiate *negop;
icmsghdrp->icmsgsize = 0x10;
negop = (struct hv_vmbus_icmsg_negotiate *)&buf[
sizeof(struct hv_vmbus_pipe_hdr) +
sizeof(struct hv_vmbus_icmsg_hdr)];
if (negop->icframe_vercnt >= 2 &&
negop->icversion_data[1].major == 3) {
negop->icversion_data[0].major = 3;
negop->icversion_data[0].minor = 0;
negop->icversion_data[1].major = 3;
negop->icversion_data[1].minor = 0;
} else {
negop->icversion_data[0].major = 1;
negop->icversion_data[0].minor = 0;
negop->icversion_data[1].major = 1;
negop->icversion_data[1].minor = 0;
}
negop->icframe_vercnt = 1;
negop->icmsg_vercnt = 1;
}
int
hv_util_attach(device_t dev, vmbus_chan_callback_t cb)
{
struct hv_util_sc *sc = device_get_softc(dev);
struct vmbus_channel *chan = vmbus_get_channel(dev);
int error;
sc->ic_buflen = VMBUS_IC_BRSIZE;
sc->receive_buffer = malloc(VMBUS_IC_BRSIZE, M_DEVBUF,
M_WAITOK | M_ZERO);
/*
* These services are not performance critical and do not need
* batched reading. Furthermore, some services such as KVP can
* only handle one message from the host at a time.
* Turn off batched reading for all util drivers before we open the
* channel.
*/
vmbus_chan_set_readbatch(chan, false);
error = vmbus_chan_open(chan, VMBUS_IC_BRSIZE, VMBUS_IC_BRSIZE, NULL, 0,
cb, sc);
if (error) {
free(sc->receive_buffer, M_DEVBUF);
return (error);
}
return (0);
}
int
hv_util_detach(device_t dev)
{
struct hv_util_sc *sc = device_get_softc(dev);
vmbus_chan_close(vmbus_get_channel(dev));
free(sc->receive_buffer, M_DEVBUF);
return (0);
}
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