drivers/staging/hv/hv_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 "vmbus_packet_format.h"
  32 #include "vmbus_channel_interface.h"
  33 #include "version_info.h"
  34 #include "channel.h"
  35 #include "vmbus_private.h"
  36 #include "vmbus_api.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
 110 /*
 111  * Synchronize time with host after reboot, restore, etc.
 112  */
 113 static void adj_guesttime(u64 hosttime, u8 flags)
 114 {
 115         s64 host_tns;
 116         struct timespec host_ts;
 117         static s32 scnt = 50;
 118
 119         host_tns = (hosttime - WLTIMEDELTA) * 100;
 120         host_ts = ns_to_timespec(host_tns);
 121
 122         if ((flags & ICTIMESYNCFLAG_SYNC) != 0) {
 123                 do_settimeofday(&host_ts);
 124                 return;
 125         }
 126
 127         if ((flags & ICTIMESYNCFLAG_SAMPLE) != 0 &&
 128             scnt > 0) {
 129                 scnt--;
 130                 do_settimeofday(&host_ts);
 131         }
 132
 133         return;
 134 }
 135
 136 /*
 137  * Time Sync Channel message handler.
 138  */
 139 static void timesync_onchannelcallback(void *context)
 140 {
 141         struct vmbus_channel *channel = context;
 142         u8 *buf;
 143         u32 buflen, recvlen;
 144         u64 requestid;
 145         struct icmsg_hdr *icmsghdrp;
 146         struct ictimesync_data *timedatap;
 147
 148         DPRINT_ENTER(VMBUS);
 149
 150         buflen = PAGE_SIZE;
 151         buf = kmalloc(buflen, GFP_ATOMIC);
 152
 153         VmbusChannelRecvPacket(channel, buf, buflen, &recvlen, &requestid);
 154
 155         if (recvlen > 0) {
 156                 DPRINT_DBG(VMBUS, "timesync packet: recvlen=%d, requestid=%lld",
 157                         recvlen, requestid);
 158
 159                 icmsghdrp = (struct icmsg_hdr *)&buf[
 160                                 sizeof(struct vmbuspipe_hdr)];
 161
 162                 if (icmsghdrp->icmsgtype == ICMSGTYPE_NEGOTIATE) {
 163                         prep_negotiate_resp(icmsghdrp, NULL, buf);
 164                 } else {
 165                         timedatap = (struct ictimesync_data *)&buf[
 166                                 sizeof(struct vmbuspipe_hdr) +
 167                                 sizeof(struct icmsg_hdr)];
 168                         adj_guesttime(timedatap->parenttime, timedatap->flags);
 169                 }
 170
 171                 icmsghdrp->icflags = ICMSGHDRFLAG_TRANSACTION
 172                         | ICMSGHDRFLAG_RESPONSE;
 173
 174                 VmbusChannelSendPacket(channel, buf,
 175                                 recvlen, requestid,
 176                                 VmbusPacketTypeDataInBand, 0);
 177         }
 178
 179         kfree(buf);
 180
 181         DPRINT_EXIT(VMBUS);
 182 }
 183
 184
 185 static int __init init_hyperv_utils(void)
 186 {
 187         printk(KERN_INFO "Registering HyperV Utility Driver\n");
 188
 189         hv_cb_utils[HV_SHUTDOWN_MSG].channel->OnChannelCallback =
 190                 &shutdown_onchannelcallback;
 191         hv_cb_utils[HV_SHUTDOWN_MSG].callback = &shutdown_onchannelcallback;
 192
 193         hv_cb_utils[HV_TIMESYNC_MSG].channel->OnChannelCallback =
 194                 &timesync_onchannelcallback;
 195         hv_cb_utils[HV_TIMESYNC_MSG].callback = &timesync_onchannelcallback;
 196
 197         return 0;
 198 }
 199
 200 static void exit_hyperv_utils(void)
 201 {
 202         printk(KERN_INFO "De-Registered HyperV Utility Driver\n");
 203
 204         hv_cb_utils[HV_SHUTDOWN_MSG].channel->OnChannelCallback =
 205                 &chn_cb_negotiate;
 206         hv_cb_utils[HV_SHUTDOWN_MSG].callback = &chn_cb_negotiate;
 207
 208         hv_cb_utils[HV_TIMESYNC_MSG].channel->OnChannelCallback =
 209                 &chn_cb_negotiate;
 210         hv_cb_utils[HV_TIMESYNC_MSG].callback = &chn_cb_negotiate;
 211 }
 212
 213 module_init(init_hyperv_utils);
 214 module_exit(exit_hyperv_utils);
 215
 216 MODULE_DESCRIPTION("Hyper-V Utilities");
 217 MODULE_VERSION(HV_DRV_VERSION);
 218 MODULE_LICENSE("GPL");