sys/dev/hyperv/utilities/hv_shutdown.c

   1 /*-
   2  * Copyright (c) 2014 Microsoft Corp.
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice unmodified, this list of conditions, and the following
  10  *    disclaimer.
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  *    notice, this list of conditions and the following disclaimer in the
  13  *    documentation and/or other materials provided with the distribution.
  14  *
  15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  16  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  17  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  18  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  19  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  20  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  21  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  22  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  23  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  24  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  25  *
  26  * $FreeBSD$
  27  */
  28
  29 /*
  30  * A common driver for all hyper-V util services.
  31  */
  32
  33 #include <sys/param.h>
  34 #include <sys/kernel.h>
  35 #include <sys/bus.h>
  36 #include <sys/malloc.h>
  37 #include <sys/module.h>
  38 #include <sys/reboot.h>
  39 #include <sys/timetc.h>
  40 #include <sys/syscallsubr.h>
  41
  42 #include <dev/hyperv/include/hyperv.h>
  43 #include "hv_util.h"
  44
  45 static hv_guid service_guid = { .data =
  46         {0x31, 0x60, 0x0B, 0X0E, 0x13, 0x52, 0x34, 0x49,
  47         0x81, 0x8B, 0x38, 0XD9, 0x0C, 0xED, 0x39, 0xDB} };
  48
  49 /**
  50  * Shutdown
  51  */
  52 static void
  53 hv_shutdown_cb(void *context)
  54 {
  55         uint8_t*                        buf;
  56         hv_vmbus_channel*               channel;
  57         uint8_t                         execute_shutdown = 0;
  58         hv_vmbus_icmsg_hdr*             icmsghdrp;
  59         uint32_t                        recv_len;
  60         uint64_t                        request_id;
  61         int                             ret;
  62         hv_vmbus_shutdown_msg_data*     shutdown_msg;
  63         hv_util_sc                      *softc;
  64
  65         softc = (hv_util_sc*)context;
  66         buf = softc->receive_buffer;;
  67         channel = softc->hv_dev->channel;
  68         ret = hv_vmbus_channel_recv_packet(channel, buf, PAGE_SIZE,
  69                                             &recv_len, &request_id);
  70
  71         if ((ret == 0) && recv_len > 0) {
  72
  73             icmsghdrp = (struct hv_vmbus_icmsg_hdr *)
  74                 &buf[sizeof(struct hv_vmbus_pipe_hdr)];
  75
  76             if (icmsghdrp->icmsgtype == HV_ICMSGTYPE_NEGOTIATE) {
  77                 hv_negotiate_version(icmsghdrp, NULL, buf);
  78
  79             } else {
  80                 shutdown_msg =
  81                     (struct hv_vmbus_shutdown_msg_data *)
  82                     &buf[sizeof(struct hv_vmbus_pipe_hdr) +
  83                         sizeof(struct hv_vmbus_icmsg_hdr)];
  84
  85                 switch (shutdown_msg->flags) {
  86                     case 0:
  87                     case 1:
  88                         icmsghdrp->status = HV_S_OK;
  89                         execute_shutdown = 1;
  90                         if(bootverbose)
  91                             printf("Shutdown request received -"
  92                                     " graceful shutdown initiated\n");
  93                         break;
  94                     default:
  95                         icmsghdrp->status = HV_E_FAIL;
  96                         execute_shutdown = 0;
  97                         printf("Shutdown request received -"
  98                             " Invalid request\n");
  99                         break;
 100                     }
 101             }
 102
 103         icmsghdrp->icflags = HV_ICMSGHDRFLAG_TRANSACTION |
 104                                  HV_ICMSGHDRFLAG_RESPONSE;
 105
 106             hv_vmbus_channel_send_packet(channel, buf,
 107                                         recv_len, request_id,
 108                                         HV_VMBUS_PACKET_TYPE_DATA_IN_BAND, 0);
 109         }
 110
 111         if (execute_shutdown)
 112             shutdown_nice(RB_POWEROFF);
 113 }
 114
 115 static int
 116 hv_shutdown_probe(device_t dev)
 117 {
 118         const char *p = vmbus_get_type(dev);
 119         if (!memcmp(p, &service_guid, sizeof(hv_guid))) {
 120                 device_set_desc(dev, "Hyper-V Shutdown Service");
 121                 return BUS_PROBE_DEFAULT;
 122         }
 123
 124         return ENXIO;
 125 }
 126
 127 static int
 128 hv_shutdown_attach(device_t dev)
 129 {
 130         hv_util_sc *softc = (hv_util_sc*)device_get_softc(dev);
 131
 132         softc->callback = hv_shutdown_cb;
 133
 134         return hv_util_attach(dev);
 135 }
 136
 137 static device_method_t shutdown_methods[] = {
 138         /* Device interface */
 139         DEVMETHOD(device_probe, hv_shutdown_probe),
 140         DEVMETHOD(device_attach, hv_shutdown_attach),
 141         DEVMETHOD(device_detach, hv_util_detach),
 142         { 0, 0 }
 143 };
 144
 145 static driver_t shutdown_driver = { "hvshutdown", shutdown_methods, sizeof(hv_util_sc)};
 146
 147 static devclass_t shutdown_devclass;
 148
 149 DRIVER_MODULE(hv_shutdown, vmbus, shutdown_driver, shutdown_devclass, NULL, NULL);
 150 MODULE_VERSION(hv_shutdown, 1);
 151 MODULE_DEPEND(hv_shutdown, vmbus, 1, 1, 1);