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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/systm.h>
#include <sys/timetc.h>
#include <dev/hyperv/include/hyperv.h>
#include <dev/hyperv/include/vmbus.h>
#include <dev/hyperv/utilities/hv_util.h>
#include <dev/hyperv/utilities/vmbus_icreg.h>
#include "vmbus_if.h"
#define VMBUS_IC_BRSIZE (4 * PAGE_SIZE)
CTASSERT(sizeof(struct vmbus_icmsg_negotiate) < VMBUS_IC_BRSIZE);
int
vmbus_ic_negomsg(struct hv_util_sc *sc, void *data, int dlen)
{
struct vmbus_icmsg_negotiate *nego;
int cnt, major;
/*
* Preliminary message size verification
*/
if (dlen < sizeof(*nego)) {
device_printf(sc->ic_dev, "truncated ic negotiate, len %d\n",
dlen);
return EINVAL;
}
nego = data;
cnt = nego->ic_fwver_cnt + nego->ic_msgver_cnt;
if (dlen < __offsetof(struct vmbus_icmsg_negotiate, ic_ver[cnt])) {
device_printf(sc->ic_dev, "ic negotiate does not contain "
"versions %d\n", dlen);
return EINVAL;
}
/* Select major version; XXX looks wrong. */
if (nego->ic_fwver_cnt >= 2 && VMBUS_ICVER_MAJOR(nego->ic_ver[1]) == 3)
major = 3;
else
major = 1;
/* One framework version */
nego->ic_fwver_cnt = 1;
nego->ic_ver[0] = VMBUS_IC_VERSION(major, 0);
/* One message version */
nego->ic_msgver_cnt = 1;
nego->ic_ver[1] = VMBUS_IC_VERSION(major, 0);
/* Data contains two versions */
nego->ic_hdr.ic_dsize = __offsetof(struct vmbus_icmsg_negotiate,
ic_ver[2]) - sizeof(struct vmbus_icmsg_hdr);
return 0;
}
int
vmbus_ic_probe(device_t dev, const struct vmbus_ic_desc descs[])
{
device_t bus = device_get_parent(dev);
const struct vmbus_ic_desc *d;
if (resource_disabled(device_get_name(dev), 0))
return (ENXIO);
for (d = descs; d->ic_desc != NULL; ++d) {
if (VMBUS_PROBE_GUID(bus, dev, &d->ic_guid) == 0) {
device_set_desc(dev, d->ic_desc);
return (BUS_PROBE_DEFAULT);
}
}
return (ENXIO);
}
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_dev = dev;
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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