drivers/staging/hv/hyperv_utils.c

   1 /*
   2  * Copyright (c) 2010, Microsoft Corporation.
   3  *
   4  * This program is free software; you can redistribute it and/or modify it
   5  * under the terms and conditions of the GNU General Public License,
   6  * version 2, as published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope it will be useful, but WITHOUT
   9  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  10  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  11  * more details.
  12  *
  13  * You should have received a copy of the GNU General Public License along with
  14  * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
  15  * Place - Suite 330, Boston, MA 02111-1307 USA.
  16  *
  17  * Authors:
  18  *   Haiyang Zhang <haiyangz@microsoft.com>
  19  *   Hank Janssen  <hjanssen@microsoft.com>
  20  */
  21 #include <linux/kernel.h>
  22 #include <linux/init.h>
  23 #include <linux/module.h>
  24 #include <linux/slab.h>
  25 #include <linux/sysctl.h>
  26 #include <linux/reboot.h>
  27
  28 #include "logging.h"
  29 #include "osd.h"
  30 #include "vmbus.h"
  31 #include "VmbusPacketFormat.h"
  32 #include "VmbusChannelInterface.h"
  33 #include "VersionInfo.h"
  34 #include "Channel.h"
  35 #include "VmbusPrivate.h"
  36 #include "VmbusApi.h"
  37 #include "utils.h"
  38
  39
  40 static void shutdown_onchannelcallback(void *context)
  41 {
  42         struct vmbus_channel *channel = context;
  43         u8 *buf;
  44         u32 buflen, recvlen;
  45         u64 requestid;
  46         u8  execute_shutdown = false;
  47
  48         struct shutdown_msg_data *shutdown_msg;
  49
  50         struct icmsg_hdr *icmsghdrp;
  51         struct icmsg_negotiate *negop = NULL;
  52
  53         DPRINT_ENTER(VMBUS);
  54
  55         buflen = PAGE_SIZE;
  56         buf = kmalloc(buflen, GFP_ATOMIC);
  57
  58         VmbusChannelRecvPacket(channel, buf, buflen, &recvlen, &requestid);
  59
  60         if (recvlen > 0) {
  61                 DPRINT_DBG(VMBUS, "shutdown packet: len=%d, requestid=%lld",
  62                            recvlen, requestid);
  63
  64                 icmsghdrp = (struct icmsg_hdr *)&buf[
  65                         sizeof(struct vmbuspipe_hdr)];
  66
  67                 if (icmsghdrp->icmsgtype == ICMSGTYPE_NEGOTIATE) {
  68                         prep_negotiate_resp(icmsghdrp, negop, buf);
  69                 } else {
  70                         shutdown_msg = (struct shutdown_msg_data *)&buf[
  71                                 sizeof(struct vmbuspipe_hdr) +
  72                                 sizeof(struct icmsg_hdr)];
  73
  74                         switch (shutdown_msg->flags) {
  75                         case 0:
  76                         case 1:
  77                                 icmsghdrp->status = HV_S_OK;
  78                                 execute_shutdown = true;
  79
  80                                 DPRINT_INFO(VMBUS, "Shutdown request received -"
  81                                             " gracefull shutdown initiated");
  82                                 break;
  83                         default:
  84                                 icmsghdrp->status = HV_E_FAIL;
  85                                 execute_shutdown = false;
  86
  87                                 DPRINT_INFO(VMBUS, "Shutdown request received -"
  88                                             " Invalid request");
  89                                 break;
  90                         };
  91                 }
  92
  93                 icmsghdrp->icflags = ICMSGHDRFLAG_TRANSACTION
  94                         | ICMSGHDRFLAG_RESPONSE;
  95
  96                 VmbusChannelSendPacket(channel, buf,
  97                                        recvlen, requestid,
  98                                        VmbusPacketTypeDataInBand, 0);
  99         }
 100
 101         kfree(buf);
 102
 103         DPRINT_EXIT(VMBUS);
 104
 105         if (execute_shutdown == true)
 106                 orderly_poweroff(false);
 107 }
 108
 109 static int __init init_hyperv_utils(void)
 110 {
 111         printk(KERN_INFO "Registering HyperV Utility Driver\n");
 112
 113         hv_cb_utils[HV_SHUTDOWN_MSG].channel->OnChannelCallback =
 114                 &shutdown_onchannelcallback;
 115         hv_cb_utils[HV_SHUTDOWN_MSG].callback = &shutdown_onchannelcallback;
 116
 117         return 0;
 118 }
 119
 120 static void exit_hyperv_utils(void)
 121 {
 122         printk(KERN_INFO "De-Registered HyperV Utility Driver\n");
 123
 124         hv_cb_utils[HV_SHUTDOWN_MSG].channel->OnChannelCallback =
 125                 &chn_cb_negotiate;
 126         hv_cb_utils[HV_SHUTDOWN_MSG].callback = &chn_cb_negotiate;
 127 }
 128
 129 module_init(init_hyperv_utils);
 130 module_exit(exit_hyperv_utils);
 131
 132 MODULE_DESCRIPTION("Hyper-V Utilities");
 133 MODULE_VERSION(HV_DRV_VERSION);
 134 MODULE_LICENSE("GPL");