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 #include "hyperv_vmbus.h"
  32
  33 #define SD_MAJOR        3
  34 #define SD_MINOR        0
  35 #define SD_VERSION      (SD_MAJOR << 16 | SD_MINOR)
  36
  37 #define SD_WS2008_MAJOR         1
  38 #define SD_WS2008_VERSION       (SD_WS2008_MAJOR << 16 | SD_MINOR)
  39
  40 #define TS_MAJOR        3
  41 #define TS_MINOR        0
  42 #define TS_VERSION      (TS_MAJOR << 16 | TS_MINOR)
  43
  44 #define TS_WS2008_MAJOR         1
  45 #define TS_WS2008_VERSION       (TS_WS2008_MAJOR << 16 | TS_MINOR)
  46
  47 #define HB_MAJOR        3
  48 #define HB_MINOR 0
  49 #define HB_VERSION      (HB_MAJOR << 16 | HB_MINOR)
  50
  51 #define HB_WS2008_MAJOR 1
  52 #define HB_WS2008_VERSION       (HB_WS2008_MAJOR << 16 | HB_MINOR)
  53
  54 static int sd_srv_version;
  55 static int ts_srv_version;
  56 static int hb_srv_version;
  57 static int util_fw_version;
  58
  59 static void shutdown_onchannelcallback(void *context);
  60 static struct hv_util_service util_shutdown = {
  61         .util_cb = shutdown_onchannelcallback,
  62 };
  63
  64 static void timesync_onchannelcallback(void *context);
  65 static struct hv_util_service util_timesynch = {
  66         .util_cb = timesync_onchannelcallback,
  67 };
  68
  69 static void heartbeat_onchannelcallback(void *context);
  70 static struct hv_util_service util_heartbeat = {
  71         .util_cb = heartbeat_onchannelcallback,
  72 };
  73
  74 static struct hv_util_service util_kvp = {
  75         .util_cb = hv_kvp_onchannelcallback,
  76         .util_init = hv_kvp_init,
  77         .util_deinit = hv_kvp_deinit,
  78 };
  79
  80 static struct hv_util_service util_vss = {
  81         .util_cb = hv_vss_onchannelcallback,
  82         .util_init = hv_vss_init,
  83         .util_deinit = hv_vss_deinit,
  84 };
  85
  86 static struct hv_util_service util_fcopy = {
  87         .util_cb = hv_fcopy_onchannelcallback,
  88         .util_init = hv_fcopy_init,
  89         .util_deinit = hv_fcopy_deinit,
  90 };
  91
  92 static void perform_shutdown(struct work_struct *dummy)
  93 {
  94         orderly_poweroff(true);
  95 }
  96
  97 /*
  98  * Perform the shutdown operation in a thread context.
  99  */
 100 static DECLARE_WORK(shutdown_work, perform_shutdown);
 101
 102 static void shutdown_onchannelcallback(void *context)
 103 {
 104         struct vmbus_channel *channel = context;
 105         u32 recvlen;
 106         u64 requestid;
 107         bool execute_shutdown = false;
 108         u8  *shut_txf_buf = util_shutdown.recv_buffer;
 109
 110         struct shutdown_msg_data *shutdown_msg;
 111
 112         struct icmsg_hdr *icmsghdrp;
 113         struct icmsg_negotiate *negop = NULL;
 114
 115         vmbus_recvpacket(channel, shut_txf_buf,
 116                          PAGE_SIZE, &recvlen, &requestid);
 117
 118         if (recvlen > 0) {
 119                 icmsghdrp = (struct icmsg_hdr *)&shut_txf_buf[
 120                         sizeof(struct vmbuspipe_hdr)];
 121
 122                 if (icmsghdrp->icmsgtype == ICMSGTYPE_NEGOTIATE) {
 123                         vmbus_prep_negotiate_resp(icmsghdrp, negop,
 124                                         shut_txf_buf, util_fw_version,
 125                                         sd_srv_version);
 126                 } else {
 127                         shutdown_msg =
 128                                 (struct shutdown_msg_data *)&shut_txf_buf[
 129                                         sizeof(struct vmbuspipe_hdr) +
 130                                         sizeof(struct icmsg_hdr)];
 131
 132                         switch (shutdown_msg->flags) {
 133                         case 0:
 134                         case 1:
 135                                 icmsghdrp->status = HV_S_OK;
 136                                 execute_shutdown = true;
 137
 138                                 pr_info("Shutdown request received -"
 139                                             " graceful shutdown initiated\n");
 140                                 break;
 141                         default:
 142                                 icmsghdrp->status = HV_E_FAIL;
 143                                 execute_shutdown = false;
 144
 145                                 pr_info("Shutdown request received -"
 146                                             " Invalid request\n");
 147                                 break;
 148                         }
 149                 }
 150
 151                 icmsghdrp->icflags = ICMSGHDRFLAG_TRANSACTION
 152                         | ICMSGHDRFLAG_RESPONSE;
 153
 154                 vmbus_sendpacket(channel, shut_txf_buf,
 155                                        recvlen, requestid,
 156                                        VM_PKT_DATA_INBAND, 0);
 157         }
 158
 159         if (execute_shutdown == true)
 160                 schedule_work(&shutdown_work);
 161 }
 162
 163 /*
 164  * Set guest time to host UTC time.
 165  */
 166 static inline void do_adj_guesttime(u64 hosttime)
 167 {
 168         s64 host_tns;
 169         struct timespec host_ts;
 170
 171         host_tns = (hosttime - WLTIMEDELTA) * 100;
 172         host_ts = ns_to_timespec(host_tns);
 173
 174         do_settimeofday(&host_ts);
 175 }
 176
 177 /*
 178  * Set the host time in a process context.
 179  */
 180
 181 struct adj_time_work {
 182         struct work_struct work;
 183         u64     host_time;
 184 };
 185
 186 static void hv_set_host_time(struct work_struct *work)
 187 {
 188         struct adj_time_work    *wrk;
 189
 190         wrk = container_of(work, struct adj_time_work, work);
 191         do_adj_guesttime(wrk->host_time);
 192         kfree(wrk);
 193 }
 194
 195 /*
 196  * Synchronize time with host after reboot, restore, etc.
 197  *
 198  * ICTIMESYNCFLAG_SYNC flag bit indicates reboot, restore events of the VM.
 199  * After reboot the flag ICTIMESYNCFLAG_SYNC is included in the first time
 200  * message after the timesync channel is opened. Since the hv_utils module is
 201  * loaded after hv_vmbus, the first message is usually missed. The other
 202  * thing is, systime is automatically set to emulated hardware clock which may
 203  * not be UTC time or in the same time zone. So, to override these effects, we
 204  * use the first 50 time samples for initial system time setting.
 205  */
 206 static inline void adj_guesttime(u64 hosttime, u8 flags)
 207 {
 208         struct adj_time_work    *wrk;
 209         static s32 scnt = 50;
 210
 211         wrk = kmalloc(sizeof(struct adj_time_work), GFP_ATOMIC);
 212         if (wrk == NULL)
 213                 return;
 214
 215         wrk->host_time = hosttime;
 216         if ((flags & ICTIMESYNCFLAG_SYNC) != 0) {
 217                 INIT_WORK(&wrk->work, hv_set_host_time);
 218                 schedule_work(&wrk->work);
 219                 return;
 220         }
 221
 222         if ((flags & ICTIMESYNCFLAG_SAMPLE) != 0 && scnt > 0) {
 223                 scnt--;
 224                 INIT_WORK(&wrk->work, hv_set_host_time);
 225                 schedule_work(&wrk->work);
 226         } else
 227                 kfree(wrk);
 228 }
 229
 230 /*
 231  * Time Sync Channel message handler.
 232  */
 233 static void timesync_onchannelcallback(void *context)
 234 {
 235         struct vmbus_channel *channel = context;
 236         u32 recvlen;
 237         u64 requestid;
 238         struct icmsg_hdr *icmsghdrp;
 239         struct ictimesync_data *timedatap;
 240         u8 *time_txf_buf = util_timesynch.recv_buffer;
 241         struct icmsg_negotiate *negop = NULL;
 242
 243         vmbus_recvpacket(channel, time_txf_buf,
 244                          PAGE_SIZE, &recvlen, &requestid);
 245
 246         if (recvlen > 0) {
 247                 icmsghdrp = (struct icmsg_hdr *)&time_txf_buf[
 248                                 sizeof(struct vmbuspipe_hdr)];
 249
 250                 if (icmsghdrp->icmsgtype == ICMSGTYPE_NEGOTIATE) {
 251                         vmbus_prep_negotiate_resp(icmsghdrp, negop,
 252                                                 time_txf_buf,
 253                                                 util_fw_version,
 254                                                 ts_srv_version);
 255                 } else {
 256                         timedatap = (struct ictimesync_data *)&time_txf_buf[
 257                                 sizeof(struct vmbuspipe_hdr) +
 258                                 sizeof(struct icmsg_hdr)];
 259                         adj_guesttime(timedatap->parenttime, timedatap->flags);
 260                 }
 261
 262                 icmsghdrp->icflags = ICMSGHDRFLAG_TRANSACTION
 263                         | ICMSGHDRFLAG_RESPONSE;
 264
 265                 vmbus_sendpacket(channel, time_txf_buf,
 266                                 recvlen, requestid,
 267                                 VM_PKT_DATA_INBAND, 0);
 268         }
 269 }
 270
 271 /*
 272  * Heartbeat functionality.
 273  * Every two seconds, Hyper-V send us a heartbeat request message.
 274  * we respond to this message, and Hyper-V knows we are alive.
 275  */
 276 static void heartbeat_onchannelcallback(void *context)
 277 {
 278         struct vmbus_channel *channel = context;
 279         u32 recvlen;
 280         u64 requestid;
 281         struct icmsg_hdr *icmsghdrp;
 282         struct heartbeat_msg_data *heartbeat_msg;
 283         u8 *hbeat_txf_buf = util_heartbeat.recv_buffer;
 284         struct icmsg_negotiate *negop = NULL;
 285
 286         while (1) {
 287
 288                 vmbus_recvpacket(channel, hbeat_txf_buf,
 289                                  PAGE_SIZE, &recvlen, &requestid);
 290
 291                 if (!recvlen)
 292                         break;
 293
 294                 icmsghdrp = (struct icmsg_hdr *)&hbeat_txf_buf[
 295                                 sizeof(struct vmbuspipe_hdr)];
 296
 297                 if (icmsghdrp->icmsgtype == ICMSGTYPE_NEGOTIATE) {
 298                         vmbus_prep_negotiate_resp(icmsghdrp, negop,
 299                                 hbeat_txf_buf, util_fw_version,
 300                                 hb_srv_version);
 301                 } else {
 302                         heartbeat_msg =
 303                                 (struct heartbeat_msg_data *)&hbeat_txf_buf[
 304                                         sizeof(struct vmbuspipe_hdr) +
 305                                         sizeof(struct icmsg_hdr)];
 306
 307                         heartbeat_msg->seq_num += 1;
 308                 }
 309
 310                 icmsghdrp->icflags = ICMSGHDRFLAG_TRANSACTION
 311                         | ICMSGHDRFLAG_RESPONSE;
 312
 313                 vmbus_sendpacket(channel, hbeat_txf_buf,
 314                                        recvlen, requestid,
 315                                        VM_PKT_DATA_INBAND, 0);
 316         }
 317 }
 318
 319 static int util_probe(struct hv_device *dev,
 320                         const struct hv_vmbus_device_id *dev_id)
 321 {
 322         struct hv_util_service *srv =
 323                 (struct hv_util_service *)dev_id->driver_data;
 324         int ret;
 325
 326         srv->recv_buffer = kmalloc(PAGE_SIZE * 4, GFP_KERNEL);
 327         if (!srv->recv_buffer)
 328                 return -ENOMEM;
 329         if (srv->util_init) {
 330                 ret = srv->util_init(srv);
 331                 if (ret) {
 332                         ret = -ENODEV;
 333                         goto error1;
 334                 }
 335         }
 336
 337         /*
 338          * The set of services managed by the util driver are not performance
 339          * critical and do not need batched reading. Furthermore, some services
 340          * such as KVP can only handle one message from the host at a time.
 341          * Turn off batched reading for all util drivers before we open the
 342          * channel.
 343          */
 344
 345         set_channel_read_state(dev->channel, false);
 346
 347         hv_set_drvdata(dev, srv);
 348
 349         /*
 350          * Based on the host; initialize the framework and
 351          * service version numbers we will negotiate.
 352          */
 353         switch (vmbus_proto_version) {
 354         case (VERSION_WS2008):
 355                 util_fw_version = UTIL_WS2K8_FW_VERSION;
 356                 sd_srv_version = SD_WS2008_VERSION;
 357                 ts_srv_version = TS_WS2008_VERSION;
 358                 hb_srv_version = HB_WS2008_VERSION;
 359                 break;
 360
 361         default:
 362                 util_fw_version = UTIL_FW_VERSION;
 363                 sd_srv_version = SD_VERSION;
 364                 ts_srv_version = TS_VERSION;
 365                 hb_srv_version = HB_VERSION;
 366         }
 367
 368         ret = vmbus_open(dev->channel, 4 * PAGE_SIZE, 4 * PAGE_SIZE, NULL, 0,
 369                         srv->util_cb, dev->channel);
 370         if (ret)
 371                 goto error;
 372
 373         return 0;
 374
 375 error:
 376         if (srv->util_deinit)
 377                 srv->util_deinit();
 378 error1:
 379         kfree(srv->recv_buffer);
 380         return ret;
 381 }
 382
 383 static int util_remove(struct hv_device *dev)
 384 {
 385         struct hv_util_service *srv = hv_get_drvdata(dev);
 386
 387         if (srv->util_deinit)
 388                 srv->util_deinit();
 389         vmbus_close(dev->channel);
 390         kfree(srv->recv_buffer);
 391
 392         return 0;
 393 }
 394
 395 static const struct hv_vmbus_device_id id_table[] = {
 396         /* Shutdown guid */
 397         { HV_SHUTDOWN_GUID,
 398           .driver_data = (unsigned long)&util_shutdown
 399         },
 400         /* Time synch guid */
 401         { HV_TS_GUID,
 402           .driver_data = (unsigned long)&util_timesynch
 403         },
 404         /* Heartbeat guid */
 405         { HV_HEART_BEAT_GUID,
 406           .driver_data = (unsigned long)&util_heartbeat
 407         },
 408         /* KVP guid */
 409         { HV_KVP_GUID,
 410           .driver_data = (unsigned long)&util_kvp
 411         },
 412         /* VSS GUID */
 413         { HV_VSS_GUID,
 414           .driver_data = (unsigned long)&util_vss
 415         },
 416         /* File copy GUID */
 417         { HV_FCOPY_GUID,
 418           .driver_data = (unsigned long)&util_fcopy
 419         },
 420         { },
 421 };
 422
 423 MODULE_DEVICE_TABLE(vmbus, id_table);
 424
 425 /* The one and only one */
 426 static  struct hv_driver util_drv = {
 427         .name = "hv_util",
 428         .id_table = id_table,
 429         .probe =  util_probe,
 430         .remove =  util_remove,
 431 };
 432
 433 static int __init init_hyperv_utils(void)
 434 {
 435         pr_info("Registering HyperV Utility Driver\n");
 436
 437         return vmbus_driver_register(&util_drv);
 438 }
 439
 440 static void exit_hyperv_utils(void)
 441 {
 442         pr_info("De-Registered HyperV Utility Driver\n");
 443
 444         vmbus_driver_unregister(&util_drv);
 445 }
 446
 447 module_init(init_hyperv_utils);
 448 module_exit(exit_hyperv_utils);
 449
 450 MODULE_DESCRIPTION("Hyper-V Utilities");
 451 MODULE_LICENSE("GPL");