drivers/staging/hv/channel_mgmt.c

   1 /*
   2  * Copyright (c) 2009, 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/mm.h>
  23 #include <linux/slab.h>
  24 #include <linux/list.h>
  25 #include <linux/module.h>
  26 #include <linux/completion.h>
  27 #include "osd.h"
  28 #include "logging.h"
  29 #include "vmbus_private.h"
  30 #include "utils.h"
  31
  32 struct vmbus_channel_message_table_entry {
  33         enum vmbus_channel_message_type messageType;
  34         void (*messageHandler)(struct vmbus_channel_message_header *msg);
  35 };
  36
  37 #define MAX_MSG_TYPES                    3
  38 #define MAX_NUM_DEVICE_CLASSES_SUPPORTED 7
  39
  40 static const struct hv_guid
  41         gSupportedDeviceClasses[MAX_NUM_DEVICE_CLASSES_SUPPORTED] = {
  42         /* {ba6163d9-04a1-4d29-b605-72e2ffb1dc7f} */
  43         /* Storage - SCSI */
  44         {
  45                 .data  = {
  46                         0xd9, 0x63, 0x61, 0xba, 0xa1, 0x04, 0x29, 0x4d,
  47                         0xb6, 0x05, 0x72, 0xe2, 0xff, 0xb1, 0xdc, 0x7f
  48                 }
  49         },
  50
  51         /* {F8615163-DF3E-46c5-913F-F2D2F965ED0E} */
  52         /* Network */
  53         {
  54                 .data = {
  55                         0x63, 0x51, 0x61, 0xF8, 0x3E, 0xDF, 0xc5, 0x46,
  56                         0x91, 0x3F, 0xF2, 0xD2, 0xF9, 0x65, 0xED, 0x0E
  57                 }
  58         },
  59
  60         /* {CFA8B69E-5B4A-4cc0-B98B-8BA1A1F3F95A} */
  61         /* Input */
  62         {
  63                 .data = {
  64                         0x9E, 0xB6, 0xA8, 0xCF, 0x4A, 0x5B, 0xc0, 0x4c,
  65                         0xB9, 0x8B, 0x8B, 0xA1, 0xA1, 0xF3, 0xF9, 0x5A
  66                 }
  67         },
  68
  69         /* {32412632-86cb-44a2-9b5c-50d1417354f5} */
  70         /* IDE */
  71         {
  72                 .data = {
  73                         0x32, 0x26, 0x41, 0x32, 0xcb, 0x86, 0xa2, 0x44,
  74                         0x9b, 0x5c, 0x50, 0xd1, 0x41, 0x73, 0x54, 0xf5
  75                 }
  76         },
  77         /* 0E0B6031-5213-4934-818B-38D90CED39DB */
  78         /* Shutdown */
  79         {
  80                 .data = {
  81                         0x31, 0x60, 0x0B, 0X0E, 0x13, 0x52, 0x34, 0x49,
  82                         0x81, 0x8B, 0x38, 0XD9, 0x0C, 0xED, 0x39, 0xDB
  83                 }
  84         },
  85         /* {9527E630-D0AE-497b-ADCE-E80AB0175CAF} */
  86         /* TimeSync */
  87         {
  88                 .data = {
  89                         0x30, 0xe6, 0x27, 0x95, 0xae, 0xd0, 0x7b, 0x49,
  90                         0xad, 0xce, 0xe8, 0x0a, 0xb0, 0x17, 0x5c, 0xaf
  91                 }
  92         },
  93         /* {57164f39-9115-4e78-ab55-382f3bd5422d} */
  94         /* Heartbeat */
  95         {
  96                 .data = {
  97                         0x39, 0x4f, 0x16, 0x57, 0x15, 0x91, 0x78, 0x4e,
  98                         0xab, 0x55, 0x38, 0x2f, 0x3b, 0xd5, 0x42, 0x2d
  99                 }
 100         },
 101 };
 102
 103
 104 /**
 105  * prep_negotiate_resp() - Create default response for Hyper-V Negotiate message
 106  * @icmsghdrp: Pointer to msg header structure
 107  * @icmsg_negotiate: Pointer to negotiate message structure
 108  * @buf: Raw buffer channel data
 109  *
 110  * @icmsghdrp is of type &struct icmsg_hdr.
 111  * @negop is of type &struct icmsg_negotiate.
 112  * Set up and fill in default negotiate response message. This response can
 113  * come from both the vmbus driver and the hv_utils driver. The current api
 114  * will respond properly to both Windows 2008 and Windows 2008-R2 operating
 115  * systems.
 116  *
 117  * Mainly used by Hyper-V drivers.
 118  */
 119 void prep_negotiate_resp(struct icmsg_hdr *icmsghdrp,
 120                              struct icmsg_negotiate *negop,
 121                              u8 *buf)
 122 {
 123         if (icmsghdrp->icmsgtype == ICMSGTYPE_NEGOTIATE) {
 124                 icmsghdrp->icmsgsize = 0x10;
 125
 126                 negop = (struct icmsg_negotiate *)&buf[
 127                         sizeof(struct vmbuspipe_hdr) +
 128                         sizeof(struct icmsg_hdr)];
 129
 130                 if (negop->icframe_vercnt == 2 &&
 131                    negop->icversion_data[1].major == 3) {
 132                         negop->icversion_data[0].major = 3;
 133                         negop->icversion_data[0].minor = 0;
 134                         negop->icversion_data[1].major = 3;
 135                         negop->icversion_data[1].minor = 0;
 136                 } else {
 137                         negop->icversion_data[0].major = 1;
 138                         negop->icversion_data[0].minor = 0;
 139                         negop->icversion_data[1].major = 1;
 140                         negop->icversion_data[1].minor = 0;
 141                 }
 142
 143                 negop->icframe_vercnt = 1;
 144                 negop->icmsg_vercnt = 1;
 145         }
 146 }
 147 EXPORT_SYMBOL(prep_negotiate_resp);
 148
 149 /**
 150  * chn_cb_negotiate() - Default handler for non IDE/SCSI/NETWORK
 151  * Hyper-V requests
 152  * @context: Pointer to argument structure.
 153  *
 154  * Set up the default handler for non device driver specific requests
 155  * from Hyper-V. This stub responds to the default negotiate messages
 156  * that come in for every non IDE/SCSI/Network request.
 157  * This behavior is normally overwritten in the hv_utils driver. That
 158  * driver handles requests like gracefull shutdown, heartbeats etc.
 159  *
 160  * Mainly used by Hyper-V drivers.
 161  */
 162 void chn_cb_negotiate(void *context)
 163 {
 164         struct vmbus_channel *channel = context;
 165         u8 *buf;
 166         u32 buflen, recvlen;
 167         u64 requestid;
 168
 169         struct icmsg_hdr *icmsghdrp;
 170         struct icmsg_negotiate *negop = NULL;
 171
 172         buflen = PAGE_SIZE;
 173         buf = kmalloc(buflen, GFP_ATOMIC);
 174
 175         VmbusChannelRecvPacket(channel, buf, buflen, &recvlen, &requestid);
 176
 177         if (recvlen > 0) {
 178                 icmsghdrp = (struct icmsg_hdr *)&buf[
 179                         sizeof(struct vmbuspipe_hdr)];
 180
 181                 prep_negotiate_resp(icmsghdrp, negop, buf);
 182
 183                 icmsghdrp->icflags = ICMSGHDRFLAG_TRANSACTION
 184                         | ICMSGHDRFLAG_RESPONSE;
 185
 186                 VmbusChannelSendPacket(channel, buf,
 187                                        recvlen, requestid,
 188                                        VmbusPacketTypeDataInBand, 0);
 189         }
 190
 191         kfree(buf);
 192 }
 193 EXPORT_SYMBOL(chn_cb_negotiate);
 194
 195 /*
 196  * Function table used for message responses for non IDE/SCSI/Network type
 197  * messages. (Such as KVP/Shutdown etc)
 198  */
 199 struct hyperv_service_callback hv_cb_utils[MAX_MSG_TYPES] = {
 200         /* 0E0B6031-5213-4934-818B-38D90CED39DB */
 201         /* Shutdown */
 202         {
 203                 .msg_type = HV_SHUTDOWN_MSG,
 204                 .data = {
 205                         0x31, 0x60, 0x0B, 0X0E, 0x13, 0x52, 0x34, 0x49,
 206                         0x81, 0x8B, 0x38, 0XD9, 0x0C, 0xED, 0x39, 0xDB
 207                 },
 208                 .callback = chn_cb_negotiate,
 209                 .log_msg = "Shutdown channel functionality initialized"
 210         },
 211
 212         /* {9527E630-D0AE-497b-ADCE-E80AB0175CAF} */
 213         /* TimeSync */
 214         {
 215                 .msg_type = HV_TIMESYNC_MSG,
 216                 .data = {
 217                         0x30, 0xe6, 0x27, 0x95, 0xae, 0xd0, 0x7b, 0x49,
 218                         0xad, 0xce, 0xe8, 0x0a, 0xb0, 0x17, 0x5c, 0xaf
 219                 },
 220                 .callback = chn_cb_negotiate,
 221                 .log_msg = "Timesync channel functionality initialized"
 222         },
 223         /* {57164f39-9115-4e78-ab55-382f3bd5422d} */
 224         /* Heartbeat */
 225         {
 226                 .msg_type = HV_HEARTBEAT_MSG,
 227                 .data = {
 228                         0x39, 0x4f, 0x16, 0x57, 0x15, 0x91, 0x78, 0x4e,
 229                         0xab, 0x55, 0x38, 0x2f, 0x3b, 0xd5, 0x42, 0x2d
 230                 },
 231                 .callback = chn_cb_negotiate,
 232                 .log_msg = "Heartbeat channel functionality initialized"
 233         },
 234 };
 235 EXPORT_SYMBOL(hv_cb_utils);
 236
 237 /*
 238  * AllocVmbusChannel - Allocate and initialize a vmbus channel object
 239  */
 240 struct vmbus_channel *AllocVmbusChannel(void)
 241 {
 242         struct vmbus_channel *channel;
 243
 244         channel = kzalloc(sizeof(*channel), GFP_ATOMIC);
 245         if (!channel)
 246                 return NULL;
 247
 248         spin_lock_init(&channel->inbound_lock);
 249
 250         init_timer(&channel->poll_timer);
 251         channel->poll_timer.data = (unsigned long)channel;
 252         channel->poll_timer.function = VmbusChannelOnTimer;
 253
 254         channel->ControlWQ = create_workqueue("hv_vmbus_ctl");
 255         if (!channel->ControlWQ) {
 256                 kfree(channel);
 257                 return NULL;
 258         }
 259
 260         return channel;
 261 }
 262
 263 /*
 264  * ReleaseVmbusChannel - Release the vmbus channel object itself
 265  */
 266 static inline void ReleaseVmbusChannel(void *context)
 267 {
 268         struct vmbus_channel *channel = context;
 269
 270         DPRINT_DBG(VMBUS, "releasing channel (%p)", channel);
 271         destroy_workqueue(channel->ControlWQ);
 272         DPRINT_DBG(VMBUS, "channel released (%p)", channel);
 273
 274         kfree(channel);
 275 }
 276
 277 /*
 278  * FreeVmbusChannel - Release the resources used by the vmbus channel object
 279  */
 280 void FreeVmbusChannel(struct vmbus_channel *Channel)
 281 {
 282         del_timer_sync(&Channel->poll_timer);
 283
 284         /*
 285          * We have to release the channel's workqueue/thread in the vmbus's
 286          * workqueue/thread context
 287          * ie we can't destroy ourselves.
 288          */
 289         osd_schedule_callback(gVmbusConnection.WorkQueue, ReleaseVmbusChannel,
 290                               Channel);
 291 }
 292
 293
 294 DECLARE_COMPLETION(hv_channel_ready);
 295
 296 /*
 297  * Count initialized channels, and ensure all channels are ready when hv_vmbus
 298  * module loading completes.
 299  */
 300 static void count_hv_channel(void)
 301 {
 302         static int counter;
 303         unsigned long flags;
 304
 305         spin_lock_irqsave(&gVmbusConnection.channel_lock, flags);
 306         if (++counter == MAX_MSG_TYPES)
 307                 complete(&hv_channel_ready);
 308         spin_unlock_irqrestore(&gVmbusConnection.channel_lock, flags);
 309 }
 310
 311
 312 /*
 313  * VmbusChannelProcessOffer - Process the offer by creating a channel/device
 314  * associated with this offer
 315  */
 316 static void VmbusChannelProcessOffer(void *context)
 317 {
 318         struct vmbus_channel *newChannel = context;
 319         struct vmbus_channel *channel;
 320         bool fNew = true;
 321         int ret;
 322         int cnt;
 323         unsigned long flags;
 324
 325         /* Make sure this is a new offer */
 326         spin_lock_irqsave(&gVmbusConnection.channel_lock, flags);
 327
 328         list_for_each_entry(channel, &gVmbusConnection.ChannelList, ListEntry) {
 329                 if (!memcmp(&channel->OfferMsg.Offer.InterfaceType,
 330                             &newChannel->OfferMsg.Offer.InterfaceType,
 331                             sizeof(struct hv_guid)) &&
 332                     !memcmp(&channel->OfferMsg.Offer.InterfaceInstance,
 333                             &newChannel->OfferMsg.Offer.InterfaceInstance,
 334                             sizeof(struct hv_guid))) {
 335                         fNew = false;
 336                         break;
 337                 }
 338         }
 339
 340         if (fNew)
 341                 list_add_tail(&newChannel->ListEntry,
 342                               &gVmbusConnection.ChannelList);
 343
 344         spin_unlock_irqrestore(&gVmbusConnection.channel_lock, flags);
 345
 346         if (!fNew) {
 347                 DPRINT_DBG(VMBUS, "Ignoring duplicate offer for relid (%d)",
 348                            newChannel->OfferMsg.ChildRelId);
 349                 FreeVmbusChannel(newChannel);
 350                 return;
 351         }
 352
 353         /*
 354          * Start the process of binding this offer to the driver
 355          * We need to set the DeviceObject field before calling
 356          * VmbusChildDeviceAdd()
 357          */
 358         newChannel->DeviceObject = VmbusChildDeviceCreate(
 359                 &newChannel->OfferMsg.Offer.InterfaceType,
 360                 &newChannel->OfferMsg.Offer.InterfaceInstance,
 361                 newChannel);
 362
 363         DPRINT_DBG(VMBUS, "child device object allocated - %p",
 364                    newChannel->DeviceObject);
 365
 366         /*
 367          * Add the new device to the bus. This will kick off device-driver
 368          * binding which eventually invokes the device driver's AddDevice()
 369          * method.
 370          */
 371         ret = VmbusChildDeviceAdd(newChannel->DeviceObject);
 372         if (ret != 0) {
 373                 DPRINT_ERR(VMBUS,
 374                            "unable to add child device object (relid %d)",
 375                            newChannel->OfferMsg.ChildRelId);
 376
 377                 spin_lock_irqsave(&gVmbusConnection.channel_lock, flags);
 378                 list_del(&newChannel->ListEntry);
 379                 spin_unlock_irqrestore(&gVmbusConnection.channel_lock, flags);
 380
 381                 FreeVmbusChannel(newChannel);
 382         } else {
 383                 /*
 384                  * This state is used to indicate a successful open
 385                  * so that when we do close the channel normally, we
 386                  * can cleanup properly
 387                  */
 388                 newChannel->State = CHANNEL_OPEN_STATE;
 389
 390                 /* Open IC channels */
 391                 for (cnt = 0; cnt < MAX_MSG_TYPES; cnt++) {
 392                         if (memcmp(&newChannel->OfferMsg.Offer.InterfaceType,
 393                                    &hv_cb_utils[cnt].data,
 394                                    sizeof(struct hv_guid)) == 0 &&
 395                                 VmbusChannelOpen(newChannel, 2 * PAGE_SIZE,
 396                                                  2 * PAGE_SIZE, NULL, 0,
 397                                                  hv_cb_utils[cnt].callback,
 398                                                  newChannel) == 0) {
 399                                 hv_cb_utils[cnt].channel = newChannel;
 400                                 DPRINT_INFO(VMBUS, "%s",
 401                                                 hv_cb_utils[cnt].log_msg);
 402                                 count_hv_channel();
 403                         }
 404                 }
 405         }
 406 }
 407
 408 /*
 409  * VmbusChannelProcessRescindOffer - Rescind the offer by initiating a device removal
 410  */
 411 static void VmbusChannelProcessRescindOffer(void *context)
 412 {
 413         struct vmbus_channel *channel = context;
 414
 415         VmbusChildDeviceRemove(channel->DeviceObject);
 416 }
 417
 418 /*
 419  * VmbusChannelOnOffer - Handler for channel offers from vmbus in parent partition.
 420  *
 421  * We ignore all offers except network and storage offers. For each network and
 422  * storage offers, we create a channel object and queue a work item to the
 423  * channel object to process the offer synchronously
 424  */
 425 static void VmbusChannelOnOffer(struct vmbus_channel_message_header *hdr)
 426 {
 427         struct vmbus_channel_offer_channel *offer;
 428         struct vmbus_channel *newChannel;
 429         struct hv_guid *guidType;
 430         struct hv_guid *guidInstance;
 431         int i;
 432         int fSupported = 0;
 433
 434         offer = (struct vmbus_channel_offer_channel *)hdr;
 435         for (i = 0; i < MAX_NUM_DEVICE_CLASSES_SUPPORTED; i++) {
 436                 if (memcmp(&offer->Offer.InterfaceType,
 437                     &gSupportedDeviceClasses[i], sizeof(struct hv_guid)) == 0) {
 438                         fSupported = 1;
 439                         break;
 440                 }
 441         }
 442
 443         if (!fSupported) {
 444                 DPRINT_DBG(VMBUS, "Ignoring channel offer notification for "
 445                            "child relid %d", offer->ChildRelId);
 446                 return;
 447         }
 448
 449         guidType = &offer->Offer.InterfaceType;
 450         guidInstance = &offer->Offer.InterfaceInstance;
 451
 452         DPRINT_INFO(VMBUS, "Channel offer notification - "
 453                     "child relid %d monitor id %d allocated %d, "
 454                     "type {%02x%02x%02x%02x-%02x%02x-%02x%02x-"
 455                     "%02x%02x%02x%02x%02x%02x%02x%02x} "
 456                     "instance {%02x%02x%02x%02x-%02x%02x-%02x%02x-"
 457                     "%02x%02x%02x%02x%02x%02x%02x%02x}",
 458                     offer->ChildRelId, offer->MonitorId,
 459                     offer->MonitorAllocated,
 460                     guidType->data[3], guidType->data[2],
 461                     guidType->data[1], guidType->data[0],
 462                     guidType->data[5], guidType->data[4],
 463                     guidType->data[7], guidType->data[6],
 464                     guidType->data[8], guidType->data[9],
 465                     guidType->data[10], guidType->data[11],
 466                     guidType->data[12], guidType->data[13],
 467                     guidType->data[14], guidType->data[15],
 468                     guidInstance->data[3], guidInstance->data[2],
 469                     guidInstance->data[1], guidInstance->data[0],
 470                     guidInstance->data[5], guidInstance->data[4],
 471                     guidInstance->data[7], guidInstance->data[6],
 472                     guidInstance->data[8], guidInstance->data[9],
 473                     guidInstance->data[10], guidInstance->data[11],
 474                     guidInstance->data[12], guidInstance->data[13],
 475                     guidInstance->data[14], guidInstance->data[15]);
 476
 477         /* Allocate the channel object and save this offer. */
 478         newChannel = AllocVmbusChannel();
 479         if (!newChannel) {
 480                 DPRINT_ERR(VMBUS, "unable to allocate channel object");
 481                 return;
 482         }
 483
 484         DPRINT_DBG(VMBUS, "channel object allocated - %p", newChannel);
 485
 486         memcpy(&newChannel->OfferMsg, offer,
 487                sizeof(struct vmbus_channel_offer_channel));
 488         newChannel->MonitorGroup = (u8)offer->MonitorId / 32;
 489         newChannel->MonitorBit = (u8)offer->MonitorId % 32;
 490
 491         /* TODO: Make sure the offer comes from our parent partition */
 492         osd_schedule_callback(newChannel->ControlWQ, VmbusChannelProcessOffer,
 493                               newChannel);
 494 }
 495
 496 /*
 497  * VmbusChannelOnOfferRescind - Rescind offer handler.
 498  *
 499  * We queue a work item to process this offer synchronously
 500  */
 501 static void VmbusChannelOnOfferRescind(struct vmbus_channel_message_header *hdr)
 502 {
 503         struct vmbus_channel_rescind_offer *rescind;
 504         struct vmbus_channel *channel;
 505
 506         rescind = (struct vmbus_channel_rescind_offer *)hdr;
 507         channel = GetChannelFromRelId(rescind->ChildRelId);
 508         if (channel == NULL) {
 509                 DPRINT_DBG(VMBUS, "channel not found for relId %d",
 510                            rescind->ChildRelId);
 511                 return;
 512         }
 513
 514         osd_schedule_callback(channel->ControlWQ,
 515                               VmbusChannelProcessRescindOffer,
 516                               channel);
 517 }
 518
 519 /*
 520  * VmbusChannelOnOffersDelivered - This is invoked when all offers have been delivered.
 521  *
 522  * Nothing to do here.
 523  */
 524 static void VmbusChannelOnOffersDelivered(
 525                         struct vmbus_channel_message_header *hdr)
 526 {
 527 }
 528
 529 /*
 530  * VmbusChannelOnOpenResult - Open result handler.
 531  *
 532  * This is invoked when we received a response to our channel open request.
 533  * Find the matching request, copy the response and signal the requesting
 534  * thread.
 535  */
 536 static void VmbusChannelOnOpenResult(struct vmbus_channel_message_header *hdr)
 537 {
 538         struct vmbus_channel_open_result *result;
 539         struct list_head *curr;
 540         struct vmbus_channel_msginfo *msgInfo;
 541         struct vmbus_channel_message_header *requestHeader;
 542         struct vmbus_channel_open_channel *openMsg;
 543         unsigned long flags;
 544
 545         result = (struct vmbus_channel_open_result *)hdr;
 546         DPRINT_DBG(VMBUS, "vmbus open result - %d", result->Status);
 547
 548         /*
 549          * Find the open msg, copy the result and signal/unblock the wait event
 550          */
 551         spin_lock_irqsave(&gVmbusConnection.channelmsg_lock, flags);
 552
 553         list_for_each(curr, &gVmbusConnection.ChannelMsgList) {
 554 /* FIXME: this should probably use list_entry() instead */
 555                 msgInfo = (struct vmbus_channel_msginfo *)curr;
 556                 requestHeader = (struct vmbus_channel_message_header *)msgInfo->Msg;
 557
 558                 if (requestHeader->MessageType == ChannelMessageOpenChannel) {
 559                         openMsg = (struct vmbus_channel_open_channel *)msgInfo->Msg;
 560                         if (openMsg->ChildRelId == result->ChildRelId &&
 561                             openMsg->OpenId == result->OpenId) {
 562                                 memcpy(&msgInfo->Response.OpenResult,
 563                                        result,
 564                                        sizeof(struct vmbus_channel_open_result));
 565                                 osd_WaitEventSet(msgInfo->WaitEvent);
 566                                 break;
 567                         }
 568                 }
 569         }
 570         spin_unlock_irqrestore(&gVmbusConnection.channelmsg_lock, flags);
 571 }
 572
 573 /*
 574  * VmbusChannelOnGpadlCreated - GPADL created handler.
 575  *
 576  * This is invoked when we received a response to our gpadl create request.
 577  * Find the matching request, copy the response and signal the requesting
 578  * thread.
 579  */
 580 static void VmbusChannelOnGpadlCreated(struct vmbus_channel_message_header *hdr)
 581 {
 582         struct vmbus_channel_gpadl_created *gpadlCreated;
 583         struct list_head *curr;
 584         struct vmbus_channel_msginfo *msgInfo;
 585         struct vmbus_channel_message_header *requestHeader;
 586         struct vmbus_channel_gpadl_header *gpadlHeader;
 587         unsigned long flags;
 588
 589         gpadlCreated = (struct vmbus_channel_gpadl_created *)hdr;
 590         DPRINT_DBG(VMBUS, "vmbus gpadl created result - %d",
 591                    gpadlCreated->CreationStatus);
 592
 593         /*
 594          * Find the establish msg, copy the result and signal/unblock the wait
 595          * event
 596          */
 597         spin_lock_irqsave(&gVmbusConnection.channelmsg_lock, flags);
 598
 599         list_for_each(curr, &gVmbusConnection.ChannelMsgList) {
 600 /* FIXME: this should probably use list_entry() instead */
 601                 msgInfo = (struct vmbus_channel_msginfo *)curr;
 602                 requestHeader = (struct vmbus_channel_message_header *)msgInfo->Msg;
 603
 604                 if (requestHeader->MessageType == ChannelMessageGpadlHeader) {
 605                         gpadlHeader = (struct vmbus_channel_gpadl_header *)requestHeader;
 606
 607                         if ((gpadlCreated->ChildRelId ==
 608                              gpadlHeader->ChildRelId) &&
 609                             (gpadlCreated->Gpadl == gpadlHeader->Gpadl)) {
 610                                 memcpy(&msgInfo->Response.GpadlCreated,
 611                                        gpadlCreated,
 612                                        sizeof(struct vmbus_channel_gpadl_created));
 613                                 osd_WaitEventSet(msgInfo->WaitEvent);
 614                                 break;
 615                         }
 616                 }
 617         }
 618         spin_unlock_irqrestore(&gVmbusConnection.channelmsg_lock, flags);
 619 }
 620
 621 /*
 622  * VmbusChannelOnGpadlTorndown - GPADL torndown handler.
 623  *
 624  * This is invoked when we received a response to our gpadl teardown request.
 625  * Find the matching request, copy the response and signal the requesting
 626  * thread.
 627  */
 628 static void VmbusChannelOnGpadlTorndown(
 629                         struct vmbus_channel_message_header *hdr)
 630 {
 631         struct vmbus_channel_gpadl_torndown *gpadlTorndown;
 632         struct list_head *curr;
 633         struct vmbus_channel_msginfo *msgInfo;
 634         struct vmbus_channel_message_header *requestHeader;
 635         struct vmbus_channel_gpadl_teardown *gpadlTeardown;
 636         unsigned long flags;
 637
 638         gpadlTorndown = (struct vmbus_channel_gpadl_torndown *)hdr;
 639
 640         /*
 641          * Find the open msg, copy the result and signal/unblock the wait event
 642          */
 643         spin_lock_irqsave(&gVmbusConnection.channelmsg_lock, flags);
 644
 645         list_for_each(curr, &gVmbusConnection.ChannelMsgList) {
 646 /* FIXME: this should probably use list_entry() instead */
 647                 msgInfo = (struct vmbus_channel_msginfo *)curr;
 648                 requestHeader = (struct vmbus_channel_message_header *)msgInfo->Msg;
 649
 650                 if (requestHeader->MessageType == ChannelMessageGpadlTeardown) {
 651                         gpadlTeardown = (struct vmbus_channel_gpadl_teardown *)requestHeader;
 652
 653                         if (gpadlTorndown->Gpadl == gpadlTeardown->Gpadl) {
 654                                 memcpy(&msgInfo->Response.GpadlTorndown,
 655                                        gpadlTorndown,
 656                                        sizeof(struct vmbus_channel_gpadl_torndown));
 657                                 osd_WaitEventSet(msgInfo->WaitEvent);
 658                                 break;
 659                         }
 660                 }
 661         }
 662         spin_unlock_irqrestore(&gVmbusConnection.channelmsg_lock, flags);
 663 }
 664
 665 /*
 666  * VmbusChannelOnVersionResponse - Version response handler
 667  *
 668  * This is invoked when we received a response to our initiate contact request.
 669  * Find the matching request, copy the response and signal the requesting
 670  * thread.
 671  */
 672 static void VmbusChannelOnVersionResponse(
 673                 struct vmbus_channel_message_header *hdr)
 674 {
 675         struct list_head *curr;
 676         struct vmbus_channel_msginfo *msgInfo;
 677         struct vmbus_channel_message_header *requestHeader;
 678         struct vmbus_channel_initiate_contact *initiate;
 679         struct vmbus_channel_version_response *versionResponse;
 680         unsigned long flags;
 681
 682         versionResponse = (struct vmbus_channel_version_response *)hdr;
 683         spin_lock_irqsave(&gVmbusConnection.channelmsg_lock, flags);
 684
 685         list_for_each(curr, &gVmbusConnection.ChannelMsgList) {
 686 /* FIXME: this should probably use list_entry() instead */
 687                 msgInfo = (struct vmbus_channel_msginfo *)curr;
 688                 requestHeader = (struct vmbus_channel_message_header *)msgInfo->Msg;
 689
 690                 if (requestHeader->MessageType ==
 691                     ChannelMessageInitiateContact) {
 692                         initiate = (struct vmbus_channel_initiate_contact *)requestHeader;
 693                         memcpy(&msgInfo->Response.VersionResponse,
 694                               versionResponse,
 695                               sizeof(struct vmbus_channel_version_response));
 696                         osd_WaitEventSet(msgInfo->WaitEvent);
 697                 }
 698         }
 699         spin_unlock_irqrestore(&gVmbusConnection.channelmsg_lock, flags);
 700 }
 701
 702 /* Channel message dispatch table */
 703 static struct vmbus_channel_message_table_entry
 704         gChannelMessageTable[ChannelMessageCount] = {
 705         {ChannelMessageInvalid,                 NULL},
 706         {ChannelMessageOfferChannel,            VmbusChannelOnOffer},
 707         {ChannelMessageRescindChannelOffer,     VmbusChannelOnOfferRescind},
 708         {ChannelMessageRequestOffers,           NULL},
 709         {ChannelMessageAllOffersDelivered,      VmbusChannelOnOffersDelivered},
 710         {ChannelMessageOpenChannel,             NULL},
 711         {ChannelMessageOpenChannelResult,       VmbusChannelOnOpenResult},
 712         {ChannelMessageCloseChannel,            NULL},
 713         {ChannelMessageGpadlHeader,             NULL},
 714         {ChannelMessageGpadlBody,               NULL},
 715         {ChannelMessageGpadlCreated,            VmbusChannelOnGpadlCreated},
 716         {ChannelMessageGpadlTeardown,           NULL},
 717         {ChannelMessageGpadlTorndown,           VmbusChannelOnGpadlTorndown},
 718         {ChannelMessageRelIdReleased,           NULL},
 719         {ChannelMessageInitiateContact,         NULL},
 720         {ChannelMessageVersionResponse,         VmbusChannelOnVersionResponse},
 721         {ChannelMessageUnload,                  NULL},
 722 };
 723
 724 /*
 725  * VmbusOnChannelMessage - Handler for channel protocol messages.
 726  *
 727  * This is invoked in the vmbus worker thread context.
 728  */
 729 void VmbusOnChannelMessage(void *Context)
 730 {
 731         struct hv_message *msg = Context;
 732         struct vmbus_channel_message_header *hdr;
 733         int size;
 734
 735         hdr = (struct vmbus_channel_message_header *)msg->u.Payload;
 736         size = msg->Header.PayloadSize;
 737
 738         DPRINT_DBG(VMBUS, "message type %d size %d", hdr->MessageType, size);
 739
 740         if (hdr->MessageType >= ChannelMessageCount) {
 741                 DPRINT_ERR(VMBUS,
 742                            "Received invalid channel message type %d size %d",
 743                            hdr->MessageType, size);
 744                 print_hex_dump_bytes("", DUMP_PREFIX_NONE,
 745                                      (unsigned char *)msg->u.Payload, size);
 746                 kfree(msg);
 747                 return;
 748         }
 749
 750         if (gChannelMessageTable[hdr->MessageType].messageHandler)
 751                 gChannelMessageTable[hdr->MessageType].messageHandler(hdr);
 752         else
 753                 DPRINT_ERR(VMBUS, "Unhandled channel message type %d",
 754                            hdr->MessageType);
 755
 756         /* Free the msg that was allocated in VmbusOnMsgDPC() */
 757         kfree(msg);
 758 }
 759
 760 /*
 761  * VmbusChannelRequestOffers - Send a request to get all our pending offers.
 762  */
 763 int VmbusChannelRequestOffers(void)
 764 {
 765         struct vmbus_channel_message_header *msg;
 766         struct vmbus_channel_msginfo *msgInfo;
 767         int ret;
 768
 769         msgInfo = kmalloc(sizeof(*msgInfo) +
 770                           sizeof(struct vmbus_channel_message_header),
 771                           GFP_KERNEL);
 772         if (!msgInfo)
 773                 return -ENOMEM;
 774
 775         msgInfo->WaitEvent = osd_WaitEventCreate();
 776         if (!msgInfo->WaitEvent) {
 777                 kfree(msgInfo);
 778                 return -ENOMEM;
 779         }
 780
 781         msg = (struct vmbus_channel_message_header *)msgInfo->Msg;
 782
 783         msg->MessageType = ChannelMessageRequestOffers;
 784
 785         /*SpinlockAcquire(gVmbusConnection.channelMsgLock);
 786         INSERT_TAIL_LIST(&gVmbusConnection.channelMsgList,
 787                          &msgInfo->msgListEntry);
 788         SpinlockRelease(gVmbusConnection.channelMsgLock);*/
 789
 790         ret = VmbusPostMessage(msg,
 791                                sizeof(struct vmbus_channel_message_header));
 792         if (ret != 0) {
 793                 DPRINT_ERR(VMBUS, "Unable to request offers - %d", ret);
 794
 795                 /*SpinlockAcquire(gVmbusConnection.channelMsgLock);
 796                 REMOVE_ENTRY_LIST(&msgInfo->msgListEntry);
 797                 SpinlockRelease(gVmbusConnection.channelMsgLock);*/
 798
 799                 goto Cleanup;
 800         }
 801         /* osd_WaitEventWait(msgInfo->waitEvent); */
 802
 803         /*SpinlockAcquire(gVmbusConnection.channelMsgLock);
 804         REMOVE_ENTRY_LIST(&msgInfo->msgListEntry);
 805         SpinlockRelease(gVmbusConnection.channelMsgLock);*/
 806
 807
 808 Cleanup:
 809         if (msgInfo) {
 810                 kfree(msgInfo->WaitEvent);
 811                 kfree(msgInfo);
 812         }
 813
 814         return ret;
 815 }
 816
 817 /*
 818  * VmbusChannelReleaseUnattachedChannels - Release channels that are
 819  * unattached/unconnected ie (no drivers associated)
 820  */
 821 void VmbusChannelReleaseUnattachedChannels(void)
 822 {
 823         struct vmbus_channel *channel, *pos;
 824         struct vmbus_channel *start = NULL;
 825         unsigned long flags;
 826
 827         spin_lock_irqsave(&gVmbusConnection.channel_lock, flags);
 828
 829         list_for_each_entry_safe(channel, pos, &gVmbusConnection.ChannelList,
 830                                  ListEntry) {
 831                 if (channel == start)
 832                         break;
 833
 834                 if (!channel->DeviceObject->Driver) {
 835                         list_del(&channel->ListEntry);
 836                         DPRINT_INFO(VMBUS,
 837                                     "Releasing unattached device object %p",
 838                                     channel->DeviceObject);
 839
 840                         VmbusChildDeviceRemove(channel->DeviceObject);
 841                         FreeVmbusChannel(channel);
 842                 } else {
 843                         if (!start)
 844                                 start = channel;
 845                 }
 846         }
 847
 848         spin_unlock_irqrestore(&gVmbusConnection.channel_lock, flags);
 849 }
 850
 851 /* eof */