drivers/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 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  22
  23 #include <linux/kernel.h>
  24 #include <linux/init.h>
  25 #include <linux/module.h>
  26 #include <linux/slab.h>
  27 #include <linux/sysctl.h>
  28 #include <linux/reboot.h>
  29 #include <linux/hyperv.h>
  30
  31
  32 #define SD_MAJOR        3
  33 #define SD_MINOR        0
  34 #define SD_VERSION      (SD_MAJOR << 16 | SD_MINOR)
  35
  36 #define SD_WS2008_MAJOR         1
  37 #define SD_WS2008_VERSION       (SD_WS2008_MAJOR << 16 | SD_MINOR)
  38
  39 #define TS_MAJOR        3
  40 #define TS_MINOR        0
  41 #define TS_VERSION      (TS_MAJOR << 16 | TS_MINOR)
  42
  43 #define TS_WS2008_MAJOR         1
  44 #define TS_WS2008_VERSION       (TS_WS2008_MAJOR << 16 | TS_MINOR)
  45
  46 #define HB_MAJOR        3
  47 #define HB_MINOR 0
  48 #define HB_VERSION      (HB_MAJOR << 16 | HB_MINOR)
  49
  50 #define HB_WS2008_MAJOR 1
  51 #define HB_WS2008_VERSION       (HB_WS2008_MAJOR << 16 | HB_MINOR)
  52
  53 static int sd_srv_version;
  54 static int ts_srv_version;
  55 static int hb_srv_version;
  56 static int util_fw_version;
  57
  58 static void shutdown_onchannelcallback(void *context);
  59 static struct hv_util_service util_shutdown = {
  60         .util_cb = shutdown_onchannelcallback,
  61 };
  62
  63 static void timesync_onchannelcallback(void *context);
  64 static struct hv_util_service util_timesynch = {
  65         .util_cb = timesync_onchannelcallback,
  66 };
  67
  68 static void heartbeat_onchannelcallback(void *context);
  69 static struct hv_util_service util_heartbeat = {
  70         .util_cb = heartbeat_onchannelcallback,
  71 };
  72
  73 static struct hv_util_service util_kvp = {
  74         .util_cb = hv_kvp_onchannelcallback,
  75         .util_init = hv_kvp_init,
  76         .util_deinit = hv_kvp_deinit,
  77 };
  78
  79 static struct hv_util_service util_vss = {
  80         .util_cb = hv_vss_onchannelcallback,
  81         .util_init = hv_vss_init,
  82         .util_deinit = hv_vss_deinit,
  83 };
  84
  85 static void perform_shutdown(struct work_struct *dummy)
  86 {
  87         orderly_poweroff(true);
  88 }
  89
  90 /*
  91  * Perform the shutdown operation in a thread context.
  92  */
  93 static DECLARE_WORK(shutdown_work, perform_shutdown);
  94
  95 static void shutdown_onchannelcallback(void *context)
  96 {
  97         struct vmbus_channel *channel = context;
  98         u32 recvlen;
  99         u64 requestid;
 100         u8  execute_shutdown = false;
 101         u8  *shut_txf_buf = util_shutdown.recv_buffer;
 102
 103         struct shutdown_msg_data *shutdown_msg;
 104
 105         struct icmsg_hdr *icmsghdrp;
 106         struct icmsg_negotiate *negop = NULL;
 107
 108         vmbus_recvpacket(channel, shut_txf_buf,
 109                          PAGE_SIZE, &recvlen, &requestid);
 110
 111         if (recvlen > 0) {
 112                 icmsghdrp = (struct icmsg_hdr *)&shut_txf_buf[
 113                         sizeof(struct vmbuspipe_hdr)];
 114
 115                 if (icmsghdrp->icmsgtype == ICMSGTYPE_NEGOTIATE) {
 116                         vmbus_prep_negotiate_resp(icmsghdrp, negop,
 117                                         shut_txf_buf, util_fw_version,
 118                                         sd_srv_version);
 119                 } else {
 120                         shutdown_msg =
 121                                 (struct shutdown_msg_data *)&shut_txf_buf[
 122                                         sizeof(struct vmbuspipe_hdr) +
 123                                         sizeof(struct icmsg_hdr)];
 124
 125                         switch (shutdown_msg->flags) {
 126                         case 0:
 127                         case 1:
 128                                 icmsghdrp->status = HV_S_OK;
 129                                 execute_shutdown = true;
 130
 131                                 pr_info("Shutdown request received -"
 132                                             " graceful shutdown initiated\n");
 133                                 break;
 134                         default:
 135                                 icmsghdrp->status = HV_E_FAIL;
 136                                 execute_shutdown = false;
 137
 138                                 pr_info("Shutdown request received -"
 139                                             " Invalid request\n");
 140                                 break;
 141                         }
 142                 }
 143
 144                 icmsghdrp->icflags = ICMSGHDRFLAG_TRANSACTION
 145                         | ICMSGHDRFLAG_RESPONSE;
 146
 147                 vmbus_sendpacket(channel, shut_txf_buf,
 148                                        recvlen, requestid,
 149                                        VM_PKT_DATA_INBAND, 0);
 150         }
 151
 152         if (execute_shutdown == true)
 153                 schedule_work(&shutdown_work);
 154 }
 155
 156 /*
 157  * Set guest time to host UTC time.
 158  */
 159 static inline void do_adj_guesttime(u64 hosttime)
 160 {
 161         s64 host_tns;
 162         struct timespec host_ts;
 163
 164         host_tns = (hosttime - WLTIMEDELTA) * 100;
 165         host_ts = ns_to_timespec(host_tns);
 166
 167         do_settimeofday(&host_ts);
 168 }
 169
 170 /*
 171  * Set the host time in a process context.
 172  */
 173
 174 struct adj_time_work {
 175         struct work_struct work;
 176         u64     host_time;
 177 };
 178
 179 static void hv_set_host_time(struct work_struct *work)
 180 {
 181         struct adj_time_work    *wrk;
 182
 183         wrk = container_of(work, struct adj_time_work, work);
 184         do_adj_guesttime(wrk->host_time);
 185         kfree(wrk);
 186 }
 187
 188 /*
 189  * Synchronize time with host after reboot, restore, etc.
 190  *
 191  * ICTIMESYNCFLAG_SYNC flag bit indicates reboot, restore events of the VM.
 192  * After reboot the flag ICTIMESYNCFLAG_SYNC is included in the first time
 193  * message after the timesync channel is opened. Since the hv_utils module is
 194  * loaded after hv_vmbus, the first message is usually missed. The other
 195  * thing is, systime is automatically set to emulated hardware clock which may
 196  * not be UTC time or in the same time zone. So, to override these effects, we
 197  * use the first 50 time samples for initial system time setting.
 198  */
 199 static inline void adj_guesttime(u64 hosttime, u8 flags)
 200 {
 201         struct adj_time_work    *wrk;
 202         static s32 scnt = 50;
 203
 204         wrk = kmalloc(sizeof(struct adj_time_work), GFP_ATOMIC);
 205         if (wrk == NULL)
 206                 return;
 207
 208         wrk->host_time = hosttime;
 209         if ((flags & ICTIMESYNCFLAG_SYNC) != 0) {
 210                 INIT_WORK(&wrk->work, hv_set_host_time);
 211                 schedule_work(&wrk->work);
 212                 return;
 213         }
 214
 215         if ((flags & ICTIMESYNCFLAG_SAMPLE) != 0 && scnt > 0) {
 216                 scnt--;
 217                 INIT_WORK(&wrk->work, hv_set_host_time);
 218                 schedule_work(&wrk->work);
 219         } else
 220                 kfree(wrk);
 221 }
 222
 223 /*
 224  * Time Sync Channel message handler.
 225  */
 226 static void timesync_onchannelcallback(void *context)
 227 {
 228         struct vmbus_channel *channel = context;
 229         u32 recvlen;
 230         u64 requestid;
 231         struct icmsg_hdr *icmsghdrp;
 232         struct ictimesync_data *timedatap;
 233         u8 *time_txf_buf = util_timesynch.recv_buffer;
 234         struct icmsg_negotiate *negop = NULL;
 235
 236         vmbus_recvpacket(channel, time_txf_buf,
 237                          PAGE_SIZE, &recvlen, &requestid);
 238
 239         if (recvlen > 0) {
 240                 icmsghdrp = (struct icmsg_hdr *)&time_txf_buf[
 241                                 sizeof(struct vmbuspipe_hdr)];
 242
 243                 if (icmsghdrp->icmsgtype == ICMSGTYPE_NEGOTIATE) {
 244                         vmbus_prep_negotiate_resp(icmsghdrp, negop,
 245                                                 time_txf_buf,
 246                                                 util_fw_version,
 247                                                 ts_srv_version);
 248                 } else {
 249                         timedatap = (struct ictimesync_data *)&time_txf_buf[
 250                                 sizeof(struct vmbuspipe_hdr) +
 251                                 sizeof(struct icmsg_hdr)];
 252                         adj_guesttime(timedatap->parenttime, timedatap->flags);
 253                 }
 254
 255                 icmsghdrp->icflags = ICMSGHDRFLAG_TRANSACTION
 256                         | ICMSGHDRFLAG_RESPONSE;
 257
 258                 vmbus_sendpacket(channel, time_txf_buf,
 259                                 recvlen, requestid,
 260                                 VM_PKT_DATA_INBAND, 0);
 261         }
 262 }
 263
 264 /*
 265  * Heartbeat functionality.
 266  * Every two seconds, Hyper-V send us a heartbeat request message.
 267  * we respond to this message, and Hyper-V knows we are alive.
 268  */
 269 static void heartbeat_onchannelcallback(void *context)
 270 {
 271         struct vmbus_channel *channel = context;
 272         u32 recvlen;
 273         u64 requestid;
 274         struct icmsg_hdr *icmsghdrp;
 275         struct heartbeat_msg_data *heartbeat_msg;
 276         u8 *hbeat_txf_buf = util_heartbeat.recv_buffer;
 277         struct icmsg_negotiate *negop = NULL;
 278
 279         vmbus_recvpacket(channel, hbeat_txf_buf,
 280                          PAGE_SIZE, &recvlen, &requestid);
 281
 282         if (recvlen > 0) {
 283                 icmsghdrp = (struct icmsg_hdr *)&hbeat_txf_buf[
 284                                 sizeof(struct vmbuspipe_hdr)];
 285
 286                 if (icmsghdrp->icmsgtype == ICMSGTYPE_NEGOTIATE) {
 287                         vmbus_prep_negotiate_resp(icmsghdrp, negop,
 288                                 hbeat_txf_buf, util_fw_version,
 289                                 hb_srv_version);
 290                 } else {
 291                         heartbeat_msg =
 292                                 (struct heartbeat_msg_data *)&hbeat_txf_buf[
 293                                         sizeof(struct vmbuspipe_hdr) +
 294                                         sizeof(struct icmsg_hdr)];
 295
 296                         heartbeat_msg->seq_num += 1;
 297                 }
 298
 299                 icmsghdrp->icflags = ICMSGHDRFLAG_TRANSACTION
 300                         | ICMSGHDRFLAG_RESPONSE;
 301
 302                 vmbus_sendpacket(channel, hbeat_txf_buf,
 303                                        recvlen, requestid,
 304                                        VM_PKT_DATA_INBAND, 0);
 305         }
 306 }
 307
 308 static int util_probe(struct hv_device *dev,
 309                         const struct hv_vmbus_device_id *dev_id)
 310 {
 311         struct hv_util_service *srv =
 312                 (struct hv_util_service *)dev_id->driver_data;
 313         int ret;
 314
 315         srv->recv_buffer = kmalloc(PAGE_SIZE * 4, GFP_KERNEL);
 316         if (!srv->recv_buffer)
 317                 return -ENOMEM;
 318         if (srv->util_init) {
 319                 ret = srv->util_init(srv);
 320                 if (ret) {
 321                         ret = -ENODEV;
 322                         goto error1;
 323                 }
 324         }
 325
 326         /*
 327          * The set of services managed by the util driver are not performance
 328          * critical and do not need batched reading. Furthermore, some services
 329          * such as KVP can only handle one message from the host at a time.
 330          * Turn off batched reading for all util drivers before we open the
 331          * channel.
 332          */
 333
 334         set_channel_read_state(dev->channel, false);
 335
 336         ret = vmbus_open(dev->channel, 4 * PAGE_SIZE, 4 * PAGE_SIZE, NULL, 0,
 337                         srv->util_cb, dev->channel);
 338         if (ret)
 339                 goto error;
 340
 341         hv_set_drvdata(dev, srv);
 342         /*
 343          * Based on the host; initialize the framework and
 344          * service version numbers we will negotiate.
 345          */
 346         switch (vmbus_proto_version) {
 347         case (VERSION_WS2008):
 348                 util_fw_version = UTIL_WS2K8_FW_VERSION;
 349                 sd_srv_version = SD_WS2008_VERSION;
 350                 ts_srv_version = TS_WS2008_VERSION;
 351                 hb_srv_version = HB_WS2008_VERSION;
 352                 break;
 353
 354         default:
 355                 util_fw_version = UTIL_FW_VERSION;
 356                 sd_srv_version = SD_VERSION;
 357                 ts_srv_version = TS_VERSION;
 358                 hb_srv_version = HB_VERSION;
 359         }
 360
 361         return 0;
 362
 363 error:
 364         if (srv->util_deinit)
 365                 srv->util_deinit();
 366 error1:
 367         kfree(srv->recv_buffer);
 368         return ret;
 369 }
 370
 371 static int util_remove(struct hv_device *dev)
 372 {
 373         struct hv_util_service *srv = hv_get_drvdata(dev);
 374
 375         vmbus_close(dev->channel);
 376         if (srv->util_deinit)
 377                 srv->util_deinit();
 378         kfree(srv->recv_buffer);
 379
 380         return 0;
 381 }
 382
 383 static const struct hv_vmbus_device_id id_table[] = {
 384         /* Shutdown guid */
 385         { HV_SHUTDOWN_GUID,
 386           .driver_data = (unsigned long)&util_shutdown
 387         },
 388         /* Time synch guid */
 389         { HV_TS_GUID,
 390           .driver_data = (unsigned long)&util_timesynch
 391         },
 392         /* Heartbeat guid */
 393         { HV_HEART_BEAT_GUID,
 394           .driver_data = (unsigned long)&util_heartbeat
 395         },
 396         /* KVP guid */
 397         { HV_KVP_GUID,
 398           .driver_data = (unsigned long)&util_kvp
 399         },
 400         /* VSS GUID */
 401         { HV_VSS_GUID,
 402           .driver_data = (unsigned long)&util_vss
 403         },
 404         { },
 405 };
 406
 407 MODULE_DEVICE_TABLE(vmbus, id_table);
 408
 409 /* The one and only one */
 410 static  struct hv_driver util_drv = {
 411         .name = "hv_util",
 412         .id_table = id_table,
 413         .probe =  util_probe,
 414         .remove =  util_remove,
 415 };
 416
 417 static int __init init_hyperv_utils(void)
 418 {
 419         pr_info("Registering HyperV Utility Driver\n");
 420
 421         return vmbus_driver_register(&util_drv);
 422 }
 423
 424 static void exit_hyperv_utils(void)
 425 {
 426         pr_info("De-Registered HyperV Utility Driver\n");
 427
 428         vmbus_driver_unregister(&util_drv);
 429 }
 430
 431 module_init(init_hyperv_utils);
 432 module_exit(exit_hyperv_utils);
 433
 434 MODULE_DESCRIPTION("Hyper-V Utilities");
 435 MODULE_LICENSE("GPL");