sys/dev/hyperv/utilities/hv_shutdown.c

   1 /*-
   2  * Copyright (c) 2014,2016 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 <dev/hyperv/include/vmbus.h>
  44 #include "hv_util.h"
  45 #include "vmbus_if.h"
  46
  47 static const struct hyperv_guid service_guid = { .hv_guid =
  48         {0x31, 0x60, 0x0B, 0X0E, 0x13, 0x52, 0x34, 0x49,
  49         0x81, 0x8B, 0x38, 0XD9, 0x0C, 0xED, 0x39, 0xDB} };
  50
  51 /**
  52  * Shutdown
  53  */
  54 static void
  55 hv_shutdown_cb(void *context)
  56 {
  57         uint8_t*                        buf;
  58         hv_vmbus_channel*               channel;
  59         uint8_t                         execute_shutdown = 0;
  60         hv_vmbus_icmsg_hdr*             icmsghdrp;
  61         uint32_t                        recv_len;
  62         uint64_t                        request_id;
  63         int                             ret;
  64         hv_vmbus_shutdown_msg_data*     shutdown_msg;
  65         hv_util_sc                      *softc;
  66
  67         softc = (hv_util_sc*)context;
  68         buf = softc->receive_buffer;
  69         channel = softc->channel;
  70         ret = hv_vmbus_channel_recv_packet(channel, buf, PAGE_SIZE,
  71                                             &recv_len, &request_id);
  72
  73         if ((ret == 0) && recv_len > 0) {
  74
  75             icmsghdrp = (struct hv_vmbus_icmsg_hdr *)
  76                 &buf[sizeof(struct hv_vmbus_pipe_hdr)];
  77
  78             if (icmsghdrp->icmsgtype == HV_ICMSGTYPE_NEGOTIATE) {
  79                 hv_negotiate_version(icmsghdrp, NULL, buf);
  80
  81             } else {
  82                 shutdown_msg =
  83                     (struct hv_vmbus_shutdown_msg_data *)
  84                     &buf[sizeof(struct hv_vmbus_pipe_hdr) +
  85                         sizeof(struct hv_vmbus_icmsg_hdr)];
  86
  87                 switch (shutdown_msg->flags) {
  88                     case 0:
  89                     case 1:
  90                         icmsghdrp->status = HV_S_OK;
  91                         execute_shutdown = 1;
  92                         if(bootverbose)
  93                             printf("Shutdown request received -"
  94                                     " graceful shutdown initiated\n");
  95                         break;
  96                     default:
  97                         icmsghdrp->status = HV_E_FAIL;
  98                         execute_shutdown = 0;
  99                         printf("Shutdown request received -"
 100                             " Invalid request\n");
 101                         break;
 102                     }
 103             }
 104
 105         icmsghdrp->icflags = HV_ICMSGHDRFLAG_TRANSACTION |
 106                                  HV_ICMSGHDRFLAG_RESPONSE;
 107
 108             vmbus_chan_send(channel, VMBUS_CHANPKT_TYPE_INBAND, 0,
 109                 buf, recv_len, request_id);
 110         }
 111
 112         if (execute_shutdown)
 113             shutdown_nice(RB_POWEROFF);
 114 }
 115
 116 static int
 117 hv_shutdown_probe(device_t dev)
 118 {
 119         if (resource_disabled("hvshutdown", 0))
 120                 return ENXIO;
 121
 122         if (VMBUS_PROBE_GUID(device_get_parent(dev), dev, &service_guid) == 0) {
 123                 device_set_desc(dev, "Hyper-V Shutdown Service");
 124                 return BUS_PROBE_DEFAULT;
 125         }
 126         return ENXIO;
 127 }
 128
 129 static int
 130 hv_shutdown_attach(device_t dev)
 131 {
 132         hv_util_sc *softc = (hv_util_sc*)device_get_softc(dev);
 133
 134         softc->callback = hv_shutdown_cb;
 135
 136         return hv_util_attach(dev);
 137 }
 138
 139 static device_method_t shutdown_methods[] = {
 140         /* Device interface */
 141         DEVMETHOD(device_probe, hv_shutdown_probe),
 142         DEVMETHOD(device_attach, hv_shutdown_attach),
 143         DEVMETHOD(device_detach, hv_util_detach),
 144         { 0, 0 }
 145 };
 146
 147 static driver_t shutdown_driver = { "hvshutdown", shutdown_methods, sizeof(hv_util_sc)};
 148
 149 static devclass_t shutdown_devclass;
 150
 151 DRIVER_MODULE(hv_shutdown, vmbus, shutdown_driver, shutdown_devclass, NULL, NULL);
 152 MODULE_VERSION(hv_shutdown, 1);
 153 MODULE_DEPEND(hv_shutdown, vmbus, 1, 1, 1);