c72fc9d2b9
MFC after: 1 week Sponsored by: Microsoft Differential Revision: https://reviews.freebsd.org/D7627
162 lines
4.4 KiB
C
162 lines
4.4 KiB
C
/*-
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* Copyright (c) 2014,2016 Microsoft Corp.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice unmodified, this list of conditions, and the following
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* disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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/*
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* A common driver for all hyper-V util services.
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*/
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#include <sys/param.h>
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#include <sys/kernel.h>
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#include <sys/bus.h>
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#include <sys/malloc.h>
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#include <sys/module.h>
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#include <sys/reboot.h>
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#include <sys/systm.h>
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#include <sys/timetc.h>
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#include <dev/hyperv/include/hyperv.h>
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#include <dev/hyperv/include/vmbus.h>
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#include <dev/hyperv/utilities/hv_util.h>
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#include <dev/hyperv/utilities/vmbus_icreg.h>
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#include "vmbus_if.h"
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#define VMBUS_IC_BRSIZE (4 * PAGE_SIZE)
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#define VMBUS_IC_VERCNT 2
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#define VMBUS_IC_NEGOSZ \
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__offsetof(struct vmbus_icmsg_negotiate, ic_ver[VMBUS_IC_VERCNT])
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CTASSERT(VMBUS_IC_NEGOSZ < VMBUS_IC_BRSIZE);
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int
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vmbus_ic_negomsg(struct hv_util_sc *sc, void *data, int *dlen0)
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{
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struct vmbus_icmsg_negotiate *nego;
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int cnt, major, dlen = *dlen0;
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/*
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* Preliminary message size verification
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*/
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if (dlen < sizeof(*nego)) {
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device_printf(sc->ic_dev, "truncated ic negotiate, len %d\n",
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dlen);
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return EINVAL;
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}
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nego = data;
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cnt = nego->ic_fwver_cnt + nego->ic_msgver_cnt;
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if (dlen < __offsetof(struct vmbus_icmsg_negotiate, ic_ver[cnt])) {
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device_printf(sc->ic_dev, "ic negotiate does not contain "
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"versions %d\n", dlen);
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return EINVAL;
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}
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/* Select major version; XXX looks wrong. */
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if (nego->ic_fwver_cnt >= 2 && VMBUS_ICVER_MAJOR(nego->ic_ver[1]) == 3)
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major = 3;
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else
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major = 1;
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/* One framework version */
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nego->ic_fwver_cnt = 1;
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nego->ic_ver[0] = VMBUS_IC_VERSION(major, 0);
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/* One message version */
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nego->ic_msgver_cnt = 1;
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nego->ic_ver[1] = VMBUS_IC_VERSION(major, 0);
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/* Update data size */
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nego->ic_hdr.ic_dsize = VMBUS_IC_NEGOSZ -
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sizeof(struct vmbus_icmsg_hdr);
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/* Update total size, if necessary */
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if (dlen < VMBUS_IC_NEGOSZ)
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*dlen0 = VMBUS_IC_NEGOSZ;
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return 0;
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}
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int
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vmbus_ic_probe(device_t dev, const struct vmbus_ic_desc descs[])
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{
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device_t bus = device_get_parent(dev);
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const struct vmbus_ic_desc *d;
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if (resource_disabled(device_get_name(dev), 0))
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return (ENXIO);
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for (d = descs; d->ic_desc != NULL; ++d) {
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if (VMBUS_PROBE_GUID(bus, dev, &d->ic_guid) == 0) {
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device_set_desc(dev, d->ic_desc);
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return (BUS_PROBE_DEFAULT);
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}
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}
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return (ENXIO);
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}
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int
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hv_util_attach(device_t dev, vmbus_chan_callback_t cb)
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{
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struct hv_util_sc *sc = device_get_softc(dev);
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struct vmbus_channel *chan = vmbus_get_channel(dev);
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int error;
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sc->ic_dev = dev;
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sc->ic_buflen = VMBUS_IC_BRSIZE;
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sc->receive_buffer = malloc(VMBUS_IC_BRSIZE, M_DEVBUF,
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M_WAITOK | M_ZERO);
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/*
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* These services are not performance critical and do not need
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* batched reading. Furthermore, some services such as KVP can
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* only handle one message from the host at a time.
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* Turn off batched reading for all util drivers before we open the
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* channel.
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*/
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vmbus_chan_set_readbatch(chan, false);
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error = vmbus_chan_open(chan, VMBUS_IC_BRSIZE, VMBUS_IC_BRSIZE, NULL, 0,
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cb, sc);
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if (error) {
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free(sc->receive_buffer, M_DEVBUF);
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return (error);
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}
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return (0);
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}
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int
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hv_util_detach(device_t dev)
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{
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struct hv_util_sc *sc = device_get_softc(dev);
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vmbus_chan_close(vmbus_get_channel(dev));
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free(sc->receive_buffer, M_DEVBUF);
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return (0);
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}
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