/*      $NetBSD: hvshutdown.c,v 1.2 2019/03/01 08:17:51 nonaka 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: hvshutdown.c,v 1.2 2019/03/01 08:17:51 nonaka Exp $");
#endif
#ifdef __FBSDID
__FBSDID("$FreeBSD: head/sys/dev/hyperv/utilities/vmbus_shutdown.c 310324 2016-12-20 09:46:14Z sephe $");
#endif

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/device.h>
#include <sys/module.h>
#include <sys/pmf.h>

#include <dev/sysmon/sysmonvar.h>
#include <dev/sysmon/sysmon_taskq.h>

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

#define VMBUS_SHUTDOWN_FWVER_MAJOR      3
#define VMBUS_SHUTDOWN_FWVER            \
           VMBUS_IC_VERSION(VMBUS_SHUTDOWN_FWVER_MAJOR, 0)

#define VMBUS_SHUTDOWN_MSGVER_MAJOR     3
#define VMBUS_SHUTDOWN_MSGVER           \
           VMBUS_IC_VERSION(VMBUS_SHUTDOWN_MSGVER_MAJOR, 0)

static int      hvshutdown_match(device_t, cfdata_t, void *);
static void     hvshutdown_attach(device_t, device_t, void *);
static int      hvshutdown_detach(device_t, int);

static void     hvshutdown_channel_cb(void *);

struct hvshutdown_softc {
       struct vmbusic_softc    sc_vmbusic;

       struct sysmon_pswitch   sc_smpsw;
};

CFATTACH_DECL_NEW(hvshutdown, sizeof(struct hvshutdown_softc),
   hvshutdown_match, hvshutdown_attach, hvshutdown_detach, NULL);

static int
hvshutdown_match(device_t parent, cfdata_t cf, void *aux)
{
       struct vmbus_attach_args *aa = aux;

       return vmbusic_probe(aa, &hyperv_guid_shutdown);
}

static void
hvshutdown_attach(device_t parent, device_t self, void *aux)
{
       struct hvshutdown_softc *sc = device_private(self);
       struct vmbus_attach_args *aa = aux;
       int error;

       aprint_naive("\n");
       aprint_normal(": Hyper-V Guest Shutdown Service\n");

       error = vmbusic_attach(self, aa, hvshutdown_channel_cb);
       if (error)
               return;

       (void) pmf_device_register(self, NULL, NULL);

       sysmon_task_queue_init();

       sc->sc_smpsw.smpsw_name = device_xname(self);
       sc->sc_smpsw.smpsw_type = PSWITCH_TYPE_POWER;
       (void) sysmon_pswitch_register(&sc->sc_smpsw);
}

static int
hvshutdown_detach(device_t self, int flags)
{
       struct hvshutdown_softc *sc = device_private(self);
       int error;

       error = vmbusic_detach(self, flags);
       if (error)
               return error;

       pmf_device_deregister(self);
       sysmon_pswitch_unregister(&sc->sc_smpsw);

       return 0;
}

static void
hvshutdown_do_shutdown(void *arg)
{
       struct hvshutdown_softc *sc = arg;

       sysmon_pswitch_event(&sc->sc_smpsw, PSWITCH_EVENT_PRESSED);
}

static void
hvshutdown_channel_cb(void *arg)
{
       struct hvshutdown_softc *sc = arg;
       struct vmbusic_softc *vsc = &sc->sc_vmbusic;
       struct vmbus_channel *ch = vsc->sc_chan;
       struct vmbus_icmsg_hdr *hdr;
       struct vmbus_icmsg_shutdown *msg;
       uint64_t rid;
       uint32_t rlen;
       int error;
       bool do_shutdown = false;

       error = vmbus_channel_recv(ch, vsc->sc_buf, vsc->sc_buflen,
           &rlen, &rid, 0);
       if (error || rlen == 0) {
               if (error != EAGAIN) {
                       DPRINTF("%s: shutdown error=%d len=%u\n",
                           device_xname(vsc->sc_dev), error, rlen);
               }
               return;
       }
       if (rlen < sizeof(*hdr)) {
               DPRINTF("%s: shutdown short read len=%u\n",
                   device_xname(vsc->sc_dev), rlen);
               return;
       }

       hdr = (struct vmbus_icmsg_hdr *)vsc->sc_buf;
       switch (hdr->ic_type) {
       case VMBUS_ICMSG_TYPE_NEGOTIATE:
               error = vmbusic_negotiate(vsc, hdr, &rlen, VMBUS_SHUTDOWN_FWVER,
                   VMBUS_SHUTDOWN_MSGVER);
               if (error)
                       return;
               break;

       case VMBUS_ICMSG_TYPE_SHUTDOWN:
               if (rlen < VMBUS_ICMSG_SHUTDOWN_SIZE_MIN) {
                       DPRINTF("%s: invalid shutdown len=%u\n",
                           device_xname(vsc->sc_dev), rlen);
                       return;
               }

               msg = (struct vmbus_icmsg_shutdown *)hdr;
               if (msg->ic_haltflags == 0 || msg->ic_haltflags == 1) {
                       device_printf(vsc->sc_dev, "shutdown requested\n");
                       hdr->ic_status = VMBUS_ICMSG_STATUS_OK;
                       do_shutdown = true;
               } else {
                       device_printf(vsc->sc_dev,
                           "unknown shutdown flags 0x%08x\n",
                           msg->ic_haltflags);
                       hdr->ic_status = VMBUS_ICMSG_STATUS_FAIL;
               }
               break;

       default:
               device_printf(vsc->sc_dev,
                   "unhandled shutdown message type %u\n", hdr->ic_type);
               return;
       }

       (void) vmbusic_sendresp(vsc, ch, vsc->sc_buf, rlen, rid);

       if (do_shutdown)
               sysmon_task_queue_sched(0, hvshutdown_do_shutdown, sc);
}

MODULE(MODULE_CLASS_DRIVER, hvshutdown, "vmbus");

#ifdef _MODULE
#include "ioconf.c"
#endif

static int
hvshutdown_modcmd(modcmd_t cmd, void *aux)
{
       int error = 0;

       switch (cmd) {
       case MODULE_CMD_INIT:
#ifdef _MODULE
               error = config_init_component(cfdriver_ioconf_hvshutdown,
                   cfattach_ioconf_hvshutdown, cfdata_ioconf_hvshutdown);
#endif
               break;

       case MODULE_CMD_FINI:
#ifdef _MODULE
               error = config_fini_component(cfdriver_ioconf_hvshutdown,
                   cfattach_ioconf_hvshutdown, cfdata_ioconf_hvshutdown);
#endif
               break;

       case MODULE_CMD_AUTOUNLOAD:
               error = EBUSY;
               break;

       default:
               error = ENOTTY;
               break;
       }

       return error;
}

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