drivers/staging/hv/hv_util.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 #include <linux/dmi.h>
  28 #include <linux/pci.h>
  29
  30 #include "logging.h"
  31 #include "hv_api.h"
  32 #include "vmbus.h"
  33 #include "vmbus_packet_format.h"
  34 #include "vmbus_channel_interface.h"
  35 #include "version_info.h"
  36 #include "channel.h"
  37 #include "vmbus_private.h"
  38 #include "vmbus_api.h"
  39 #include "utils.h"
  40 #include "hv_kvp.h"
  41
  42 static u8 *shut_txf_buf;
  43 static u8 *time_txf_buf;
  44 static u8 *hbeat_txf_buf;
  45
  46 static void shutdown_onchannelcallback(void *context)
  47 {
  48         struct vmbus_channel *channel = context;
  49         u32 recvlen;
  50         u64 requestid;
  51         u8  execute_shutdown = false;
  52
  53         struct shutdown_msg_data *shutdown_msg;
  54
  55         struct icmsg_hdr *icmsghdrp;
  56         struct icmsg_negotiate *negop = NULL;
  57
  58         vmbus_recvpacket(channel, shut_txf_buf,
  59                          PAGE_SIZE, &recvlen, &requestid);
  60
  61         if (recvlen > 0) {
  62                 DPRINT_DBG(VMBUS, "shutdown packet: len=%d, requestid=%lld",
  63                            recvlen, requestid);
  64
  65                 icmsghdrp = (struct icmsg_hdr *)&shut_txf_buf[
  66                         sizeof(struct vmbuspipe_hdr)];
  67
  68                 if (icmsghdrp->icmsgtype == ICMSGTYPE_NEGOTIATE) {
  69                         prep_negotiate_resp(icmsghdrp, negop, shut_txf_buf);
  70                 } else {
  71                         shutdown_msg =
  72                                 (struct shutdown_msg_data *)&shut_txf_buf[
  73                                         sizeof(struct vmbuspipe_hdr) +
  74                                         sizeof(struct icmsg_hdr)];
  75
  76                         switch (shutdown_msg->flags) {
  77                         case 0:
  78                         case 1:
  79                                 icmsghdrp->status = HV_S_OK;
  80                                 execute_shutdown = true;
  81
  82                                 DPRINT_INFO(VMBUS, "Shutdown request received -"
  83                                             " graceful shutdown initiated");
  84                                 break;
  85                         default:
  86                                 icmsghdrp->status = HV_E_FAIL;
  87                                 execute_shutdown = false;
  88
  89                                 DPRINT_INFO(VMBUS, "Shutdown request received -"
  90                                             " Invalid request");
  91                                 break;
  92                         };
  93                 }
  94
  95                 icmsghdrp->icflags = ICMSGHDRFLAG_TRANSACTION
  96                         | ICMSGHDRFLAG_RESPONSE;
  97
  98                 vmbus_sendpacket(channel, shut_txf_buf,
  99                                        recvlen, requestid,
 100                                        VM_PKT_DATA_INBAND, 0);
 101         }
 102
 103         if (execute_shutdown == true)
 104                 orderly_poweroff(false);
 105 }
 106
 107 /*
 108  * Set guest time to host UTC time.
 109  */
 110 static inline void do_adj_guesttime(u64 hosttime)
 111 {
 112         s64 host_tns;
 113         struct timespec host_ts;
 114
 115         host_tns = (hosttime - WLTIMEDELTA) * 100;
 116         host_ts = ns_to_timespec(host_tns);
 117
 118         do_settimeofday(&host_ts);
 119 }
 120
 121 /*
 122  * Synchronize time with host after reboot, restore, etc.
 123  *
 124  * ICTIMESYNCFLAG_SYNC flag bit indicates reboot, restore events of the VM.
 125  * After reboot the flag ICTIMESYNCFLAG_SYNC is included in the first time
 126  * message after the timesync channel is opened. Since the hv_utils module is
 127  * loaded after hv_vmbus, the first message is usually missed. The other
 128  * thing is, systime is automatically set to emulated hardware clock which may
 129  * not be UTC time or in the same time zone. So, to override these effects, we
 130  * use the first 50 time samples for initial system time setting.
 131  */
 132 static inline void adj_guesttime(u64 hosttime, u8 flags)
 133 {
 134         static s32 scnt = 50;
 135
 136         if ((flags & ICTIMESYNCFLAG_SYNC) != 0) {
 137                 do_adj_guesttime(hosttime);
 138                 return;
 139         }
 140
 141         if ((flags & ICTIMESYNCFLAG_SAMPLE) != 0 && scnt > 0) {
 142                 scnt--;
 143                 do_adj_guesttime(hosttime);
 144         }
 145 }
 146
 147 /*
 148  * Time Sync Channel message handler.
 149  */
 150 static void timesync_onchannelcallback(void *context)
 151 {
 152         struct vmbus_channel *channel = context;
 153         u32 recvlen;
 154         u64 requestid;
 155         struct icmsg_hdr *icmsghdrp;
 156         struct ictimesync_data *timedatap;
 157
 158         vmbus_recvpacket(channel, time_txf_buf,
 159                          PAGE_SIZE, &recvlen, &requestid);
 160
 161         if (recvlen > 0) {
 162                 DPRINT_DBG(VMBUS, "timesync packet: recvlen=%d, requestid=%lld",
 163                         recvlen, requestid);
 164
 165                 icmsghdrp = (struct icmsg_hdr *)&time_txf_buf[
 166                                 sizeof(struct vmbuspipe_hdr)];
 167
 168                 if (icmsghdrp->icmsgtype == ICMSGTYPE_NEGOTIATE) {
 169                         prep_negotiate_resp(icmsghdrp, NULL, time_txf_buf);
 170                 } else {
 171                         timedatap = (struct ictimesync_data *)&time_txf_buf[
 172                                 sizeof(struct vmbuspipe_hdr) +
 173                                 sizeof(struct icmsg_hdr)];
 174                         adj_guesttime(timedatap->parenttime, timedatap->flags);
 175                 }
 176
 177                 icmsghdrp->icflags = ICMSGHDRFLAG_TRANSACTION
 178                         | ICMSGHDRFLAG_RESPONSE;
 179
 180                 vmbus_sendpacket(channel, time_txf_buf,
 181                                 recvlen, requestid,
 182                                 VM_PKT_DATA_INBAND, 0);
 183         }
 184 }
 185
 186 /*
 187  * Heartbeat functionality.
 188  * Every two seconds, Hyper-V send us a heartbeat request message.
 189  * we respond to this message, and Hyper-V knows we are alive.
 190  */
 191 static void heartbeat_onchannelcallback(void *context)
 192 {
 193         struct vmbus_channel *channel = context;
 194         u32 recvlen;
 195         u64 requestid;
 196         struct icmsg_hdr *icmsghdrp;
 197         struct heartbeat_msg_data *heartbeat_msg;
 198
 199         vmbus_recvpacket(channel, hbeat_txf_buf,
 200                          PAGE_SIZE, &recvlen, &requestid);
 201
 202         if (recvlen > 0) {
 203                 DPRINT_DBG(VMBUS, "heartbeat packet: len=%d, requestid=%lld",
 204                            recvlen, requestid);
 205
 206                 icmsghdrp = (struct icmsg_hdr *)&hbeat_txf_buf[
 207                                 sizeof(struct vmbuspipe_hdr)];
 208
 209                 if (icmsghdrp->icmsgtype == ICMSGTYPE_NEGOTIATE) {
 210                         prep_negotiate_resp(icmsghdrp, NULL, hbeat_txf_buf);
 211                 } else {
 212                         heartbeat_msg =
 213                                 (struct heartbeat_msg_data *)&hbeat_txf_buf[
 214                                         sizeof(struct vmbuspipe_hdr) +
 215                                         sizeof(struct icmsg_hdr)];
 216
 217                         DPRINT_DBG(VMBUS, "heartbeat seq = %lld",
 218                                    heartbeat_msg->seq_num);
 219
 220                         heartbeat_msg->seq_num += 1;
 221                 }
 222
 223                 icmsghdrp->icflags = ICMSGHDRFLAG_TRANSACTION
 224                         | ICMSGHDRFLAG_RESPONSE;
 225
 226                 vmbus_sendpacket(channel, hbeat_txf_buf,
 227                                        recvlen, requestid,
 228                                        VM_PKT_DATA_INBAND, 0);
 229         }
 230 }
 231
 232 static const struct pci_device_id __initconst
 233 hv_utils_pci_table[] __maybe_unused = {
 234         { PCI_DEVICE(0x1414, 0x5353) }, /* Hyper-V emulated VGA controller */
 235         { 0 }
 236 };
 237 MODULE_DEVICE_TABLE(pci, hv_utils_pci_table);
 238
 239
 240 static const struct dmi_system_id __initconst
 241 hv_utils_dmi_table[] __maybe_unused  = {
 242         {
 243                 .ident = "Hyper-V",
 244                 .matches = {
 245                         DMI_MATCH(DMI_SYS_VENDOR, "Microsoft Corporation"),
 246                         DMI_MATCH(DMI_PRODUCT_NAME, "Virtual Machine"),
 247                         DMI_MATCH(DMI_BOARD_NAME, "Virtual Machine"),
 248                 },
 249         },
 250         { },
 251 };
 252 MODULE_DEVICE_TABLE(dmi, hv_utils_dmi_table);
 253
 254
 255 static int __init init_hyperv_utils(void)
 256 {
 257         printk(KERN_INFO "Registering HyperV Utility Driver\n");
 258
 259         if (hv_kvp_init())
 260                 return -ENODEV;
 261
 262
 263         if (!dmi_check_system(hv_utils_dmi_table))
 264                 return -ENODEV;
 265
 266         shut_txf_buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
 267         time_txf_buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
 268         hbeat_txf_buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
 269
 270         if (!shut_txf_buf || !time_txf_buf || !hbeat_txf_buf) {
 271                 printk(KERN_INFO
 272                        "Unable to allocate memory for receive buffer\n");
 273                 kfree(shut_txf_buf);
 274                 kfree(time_txf_buf);
 275                 kfree(hbeat_txf_buf);
 276                 return -ENOMEM;
 277         }
 278
 279         hv_cb_utils[HV_SHUTDOWN_MSG].channel->onchannel_callback =
 280                 &shutdown_onchannelcallback;
 281         hv_cb_utils[HV_SHUTDOWN_MSG].callback = &shutdown_onchannelcallback;
 282
 283         hv_cb_utils[HV_TIMESYNC_MSG].channel->onchannel_callback =
 284                 &timesync_onchannelcallback;
 285         hv_cb_utils[HV_TIMESYNC_MSG].callback = &timesync_onchannelcallback;
 286
 287         hv_cb_utils[HV_HEARTBEAT_MSG].channel->onchannel_callback =
 288                 &heartbeat_onchannelcallback;
 289         hv_cb_utils[HV_HEARTBEAT_MSG].callback = &heartbeat_onchannelcallback;
 290
 291         hv_cb_utils[HV_KVP_MSG].channel->onchannel_callback =
 292                 &hv_kvp_onchannelcallback;
 293
 294
 295
 296         return 0;
 297 }
 298
 299 static void exit_hyperv_utils(void)
 300 {
 301         printk(KERN_INFO "De-Registered HyperV Utility Driver\n");
 302
 303         hv_cb_utils[HV_SHUTDOWN_MSG].channel->onchannel_callback =
 304                 &chn_cb_negotiate;
 305         hv_cb_utils[HV_SHUTDOWN_MSG].callback = &chn_cb_negotiate;
 306
 307         hv_cb_utils[HV_TIMESYNC_MSG].channel->onchannel_callback =
 308                 &chn_cb_negotiate;
 309         hv_cb_utils[HV_TIMESYNC_MSG].callback = &chn_cb_negotiate;
 310
 311         hv_cb_utils[HV_HEARTBEAT_MSG].channel->onchannel_callback =
 312                 &chn_cb_negotiate;
 313         hv_cb_utils[HV_HEARTBEAT_MSG].callback = &chn_cb_negotiate;
 314
 315         hv_cb_utils[HV_KVP_MSG].channel->onchannel_callback =
 316                 &chn_cb_negotiate;
 317         hv_kvp_deinit();
 318
 319         kfree(shut_txf_buf);
 320         kfree(time_txf_buf);
 321         kfree(hbeat_txf_buf);
 322 }
 323
 324 module_init(init_hyperv_utils);
 325 module_exit(exit_hyperv_utils);
 326
 327 MODULE_DESCRIPTION("Hyper-V Utilities");
 328 MODULE_VERSION(HV_DRV_VERSION);
 329 MODULE_LICENSE("GPL");