/*      $NetBSD: vmbusic.c,v 1.2 2019/10/01 18:00:08 chs Exp $  */
/*-
* 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.
*/

#include <sys/cdefs.h>
#ifdef __KERNEL_RCSID
__KERNEL_RCSID(0, "$NetBSD: vmbusic.c,v 1.2 2019/10/01 18:00:08 chs Exp $");
#endif
#ifdef __FBSDID
__FBSDID("$FreeBSD: head/sys/dev/hyperv/utilities/vmbus_ic.c 310317 2016-12-20 07:14:24Z sephe $");
#endif

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/device.h>
#include <sys/kmem.h>
#include <sys/reboot.h>

#include <dev/hyperv/vmbusvar.h>
#include <dev/hyperv/vmbusicreg.h>
#include <dev/hyperv/vmbusicvar.h>

#define VMBUS_IC_BRSIZE         (4 * PAGE_SIZE)

#define VMBUS_IC_VERCNT         2
#define VMBUS_IC_NEGOSZ         \
   offsetof(struct vmbus_icmsg_negotiate, ic_ver[VMBUS_IC_VERCNT])
__CTASSERT(VMBUS_IC_NEGOSZ < VMBUS_IC_BRSIZE);


int
vmbusic_probe(struct vmbus_attach_args *aa, const struct hyperv_guid *guid)
{

       if (memcmp(aa->aa_type, guid, sizeof(*aa->aa_type)) != 0)
               return 0;
       return 1;
}

int
vmbusic_attach(device_t dv, struct vmbus_attach_args *aa,
   vmbus_channel_callback_t cb)
{
       struct vmbusic_softc *sc = device_private(dv);

       sc->sc_dev = dv;
       sc->sc_chan = aa->aa_chan;

       sc->sc_buflen = VMBUS_IC_BRSIZE;
       sc->sc_buf = kmem_alloc(sc->sc_buflen, KM_SLEEP);

       /*
        * 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.
        */
       sc->sc_chan->ch_flags &= ~CHF_BATCHED;

       if (vmbus_channel_open(sc->sc_chan, sc->sc_buflen, NULL, 0, cb, sc)) {
               aprint_error_dev(dv, "failed to open channel\n");
               kmem_free(sc->sc_buf, sc->sc_buflen);
               sc->sc_buf = NULL;
               return ENXIO;
       }

       return 0;
}

int
vmbusic_detach(device_t dv, int flags)
{
       struct vmbusic_softc *sc = device_private(dv);
       int error;

       error = vmbus_channel_close(sc->sc_chan);
       if (error != 0)
               return error;

       if (sc->sc_buf != NULL) {
               kmem_free(sc->sc_buf, sc->sc_buflen);
               sc->sc_buf = NULL;
       }

       if (sc->sc_log != NULL) {
               sysctl_teardown(&sc->sc_log);
               sc->sc_log = NULL;
       }

       return 0;
}

int
vmbusic_negotiate(struct vmbusic_softc *sc, void *data, uint32_t *dlen0,
   uint32_t fw_ver, uint32_t msg_ver)
{
       struct vmbus_icmsg_negotiate *nego;
       uint32_t sel_fw_ver = 0, sel_msg_ver = 0;
       int i, cnt, dlen = *dlen0, error;
       bool has_fw_ver, has_msg_ver = false;

       /*
        * Preliminary message verification.
        */
       if (dlen < sizeof(*nego)) {
               device_printf(sc->sc_dev, "truncated ic negotiate, len %d\n",
                   dlen);
               return EINVAL;
       }
       nego = data;

       if (nego->ic_fwver_cnt == 0) {
               device_printf(sc->sc_dev, "ic negotiate does not contain "
                   "framework version %u\n", nego->ic_fwver_cnt);
               return EINVAL;
       }
       if (nego->ic_msgver_cnt == 0) {
               device_printf(sc->sc_dev, "ic negotiate does not contain "
                   "message version %u\n", nego->ic_msgver_cnt);
               return EINVAL;
       }

       cnt = nego->ic_fwver_cnt + nego->ic_msgver_cnt;
       if (dlen < offsetof(struct vmbus_icmsg_negotiate, ic_ver[cnt])) {
               device_printf(sc->sc_dev, "ic negotiate does not contain "
                   "versions %d\n", dlen);
               return EINVAL;
       }

       error = EOPNOTSUPP;

       /*
        * Find the best match framework version.
        */
       has_fw_ver = false;
       for (i = 0; i < nego->ic_fwver_cnt; ++i) {
               if (VMBUS_ICVER_LE(nego->ic_ver[i], fw_ver)) {
                       if (!has_fw_ver) {
                               sel_fw_ver = nego->ic_ver[i];
                               has_fw_ver = true;
                       } else if (VMBUS_ICVER_GT(nego->ic_ver[i],
                           sel_fw_ver)) {
                               sel_fw_ver = nego->ic_ver[i];
                       }
               }
       }
       if (!has_fw_ver) {
               device_printf(sc->sc_dev, "failed to select framework "
                   "version\n");
               goto done;
       }

       /*
        * Fine the best match message version.
        */
       has_msg_ver = false;
       for (i = nego->ic_fwver_cnt;
           i < nego->ic_fwver_cnt + nego->ic_msgver_cnt; ++i) {
               if (VMBUS_ICVER_LE(nego->ic_ver[i], msg_ver)) {
                       if (!has_msg_ver) {
                               sel_msg_ver = nego->ic_ver[i];
                               has_msg_ver = true;
                       } else if (VMBUS_ICVER_GT(nego->ic_ver[i],
                           sel_msg_ver)) {
                               sel_msg_ver = nego->ic_ver[i];
                       }
               }
       }
       if (!has_msg_ver) {
               device_printf(sc->sc_dev, "failed to select message version\n");
               goto done;
       }

       error = 0;
done:
       if (bootverbose || !has_fw_ver || !has_msg_ver) {
               if (has_fw_ver) {
                       device_printf(sc->sc_dev,
                           "sel framework version: %u.%u\n",
                           VMBUS_ICVER_MAJOR(sel_fw_ver),
                           VMBUS_ICVER_MINOR(sel_fw_ver));
               }
               for (i = 0; i < nego->ic_fwver_cnt; i++) {
                       device_printf(sc->sc_dev,
                           "supp framework version: %u.%u\n",
                           VMBUS_ICVER_MAJOR(nego->ic_ver[i]),
                           VMBUS_ICVER_MINOR(nego->ic_ver[i]));
               }

               if (has_msg_ver) {
                       device_printf(sc->sc_dev,
                           "sel message version: %u.%u\n",
                           VMBUS_ICVER_MAJOR(sel_msg_ver),
                           VMBUS_ICVER_MINOR(sel_msg_ver));
               }
               for (i = nego->ic_fwver_cnt;
                   i < nego->ic_fwver_cnt + nego->ic_msgver_cnt; i++) {
                       device_printf(sc->sc_dev,
                           "supp message version: %u.%u\n",
                           VMBUS_ICVER_MAJOR(nego->ic_ver[i]),
                           VMBUS_ICVER_MINOR(nego->ic_ver[i]));
               }
       }
       if (error)
               return error;

       /* Record the selected versions. */
       sc->sc_fwver = sel_fw_ver;
       sc->sc_msgver = sel_msg_ver;

       /* One framework version. */
       nego->ic_fwver_cnt = 1;
       nego->ic_ver[0] = sel_fw_ver;

       /* One message version. */
       nego->ic_msgver_cnt = 1;
       nego->ic_ver[1] = sel_msg_ver;

       /* Update data size. */
       nego->ic_hdr.ic_dsize = VMBUS_IC_NEGOSZ -
           sizeof(struct vmbus_icmsg_hdr);

       /* Update total size, if necessary. */
       if (dlen < VMBUS_IC_NEGOSZ)
               *dlen0 = VMBUS_IC_NEGOSZ;

       return 0;
}

int
vmbusic_sendresp(struct vmbusic_softc *sc, struct vmbus_channel *chan,
   void *data, uint32_t dlen, uint64_t rid)
{
       struct vmbus_icmsg_hdr *hdr;
       int error;

       KASSERTMSG(dlen >= sizeof(*hdr), "invalid data length %d", dlen);
       hdr = data;

       hdr->ic_flags = VMBUS_ICMSG_FLAG_TRANSACTION|VMBUS_ICMSG_FLAG_RESPONSE;
       error = vmbus_channel_send(chan, data, dlen, rid,
           VMBUS_CHANPKT_TYPE_INBAND, 0);
       if (error != 0)
               device_printf(sc->sc_dev, "resp send failed: %d\n", error);
       return error;
}

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