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f077729dbd
The saved channel callback in util softc is actually never used. MFC after: 1 week Sponsored by: Microsoft Differential Revision: https://reviews.freebsd.org/D7424
115 lines
3.4 KiB
C
115 lines
3.4 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/timetc.h>
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#include <sys/syscallsubr.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_utilreg.h>
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#include "hv_util.h"
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#define VMBUS_IC_BRSIZE (4 * PAGE_SIZE)
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void
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hv_negotiate_version(struct hv_vmbus_icmsg_hdr *icmsghdrp, uint8_t *buf)
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{
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struct hv_vmbus_icmsg_negotiate *negop;
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icmsghdrp->icmsgsize = 0x10;
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negop = (struct hv_vmbus_icmsg_negotiate *)&buf[
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sizeof(struct hv_vmbus_pipe_hdr) +
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sizeof(struct hv_vmbus_icmsg_hdr)];
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if (negop->icframe_vercnt >= 2 &&
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negop->icversion_data[1].major == 3) {
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negop->icversion_data[0].major = 3;
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negop->icversion_data[0].minor = 0;
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negop->icversion_data[1].major = 3;
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negop->icversion_data[1].minor = 0;
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} else {
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negop->icversion_data[0].major = 1;
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negop->icversion_data[0].minor = 0;
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negop->icversion_data[1].major = 1;
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negop->icversion_data[1].minor = 0;
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}
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negop->icframe_vercnt = 1;
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negop->icmsg_vercnt = 1;
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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_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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