drivers/staging/hv/ChannelMgmt.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/list.h>
  24 #include "osd.h"
  25 #include "logging.h"
  26 #include "VmbusPrivate.h"
  27
  28 struct vmbus_channel_message_table_entry {
  29         enum vmbus_channel_message_type messageType;
  30         void (*messageHandler)(struct vmbus_channel_message_header *msg);
  31 };
  32
  33 #define MAX_NUM_DEVICE_CLASSES_SUPPORTED 4
  34 static const struct hv_guid
  35                 gSupportedDeviceClasses[MAX_NUM_DEVICE_CLASSES_SUPPORTED] = {
  36         /* {ba6163d9-04a1-4d29-b605-72e2ffb1dc7f} */
  37         /* Storage - SCSI */
  38         {
  39                 .data  = {
  40                         0xd9, 0x63, 0x61, 0xba, 0xa1, 0x04, 0x29, 0x4d,
  41                         0xb6, 0x05, 0x72, 0xe2, 0xff, 0xb1, 0xdc, 0x7f
  42                 }
  43         },
  44
  45         /* {F8615163-DF3E-46c5-913F-F2D2F965ED0E} */
  46         /* Network */
  47         {
  48                 .data = {
  49                         0x63, 0x51, 0x61, 0xF8, 0x3E, 0xDF, 0xc5, 0x46,
  50                         0x91, 0x3F, 0xF2, 0xD2, 0xF9, 0x65, 0xED, 0x0E
  51                 }
  52         },
  53
  54         /* {CFA8B69E-5B4A-4cc0-B98B-8BA1A1F3F95A} */
  55         /* Input */
  56         {
  57                 .data = {
  58                         0x9E, 0xB6, 0xA8, 0xCF, 0x4A, 0x5B, 0xc0, 0x4c,
  59                         0xB9, 0x8B, 0x8B, 0xA1, 0xA1, 0xF3, 0xF9, 0x5A
  60                 }
  61         },
  62
  63         /* {32412632-86cb-44a2-9b5c-50d1417354f5} */
  64         /* IDE */
  65         {
  66                 .data = {
  67                         0x32, 0x26, 0x41, 0x32, 0xcb, 0x86, 0xa2, 0x44,
  68                         0x9b, 0x5c, 0x50, 0xd1, 0x41, 0x73, 0x54, 0xf5
  69                 }
  70         },
  71 };
  72
  73 /**
  74  * AllocVmbusChannel - Allocate and initialize a vmbus channel object
  75  */
  76 struct vmbus_channel *AllocVmbusChannel(void)
  77 {
  78         struct vmbus_channel *channel;
  79
  80         channel = kzalloc(sizeof(*channel), GFP_ATOMIC);
  81         if (!channel)
  82                 return NULL;
  83
  84         spin_lock_init(&channel->inbound_lock);
  85
  86         init_timer(&channel->poll_timer);
  87         channel->poll_timer.data = (unsigned long)channel;
  88         channel->poll_timer.function = VmbusChannelOnTimer;
  89
  90         channel->ControlWQ = create_workqueue("hv_vmbus_ctl");
  91         if (!channel->ControlWQ) {
  92                 kfree(channel);
  93                 return NULL;
  94         }
  95
  96         return channel;
  97 }
  98
  99 /**
 100  * ReleaseVmbusChannel - Release the vmbus channel object itself
 101  */
 102 static inline void ReleaseVmbusChannel(void *context)
 103 {
 104         struct vmbus_channel *channel = context;
 105
 106         DPRINT_ENTER(VMBUS);
 107
 108         DPRINT_DBG(VMBUS, "releasing channel (%p)", channel);
 109         destroy_workqueue(channel->ControlWQ);
 110         DPRINT_DBG(VMBUS, "channel released (%p)", channel);
 111
 112         kfree(channel);
 113
 114         DPRINT_EXIT(VMBUS);
 115 }
 116
 117 /**
 118  * FreeVmbusChannel - Release the resources used by the vmbus channel object
 119  */
 120 void FreeVmbusChannel(struct vmbus_channel *Channel)
 121 {
 122         del_timer(&Channel->poll_timer);
 123
 124         /*
 125          * We have to release the channel's workqueue/thread in the vmbus's
 126          * workqueue/thread context
 127          * ie we can't destroy ourselves.
 128          */
 129         osd_schedule_callback(gVmbusConnection.WorkQueue, ReleaseVmbusChannel,
 130                               Channel);
 131 }
 132
 133 /**
 134  * VmbusChannelProcessOffer - Process the offer by creating a channel/device associated with this offer
 135  */
 136 static void VmbusChannelProcessOffer(void *context)
 137 {
 138         struct vmbus_channel *newChannel = context;
 139         struct vmbus_channel *channel;
 140         bool fNew = true;
 141         int ret;
 142         unsigned long flags;
 143
 144         DPRINT_ENTER(VMBUS);
 145
 146         /* Make sure this is a new offer */
 147         spin_lock_irqsave(&gVmbusConnection.channel_lock, flags);
 148
 149         list_for_each_entry(channel, &gVmbusConnection.ChannelList, ListEntry) {
 150                 if (!memcmp(&channel->OfferMsg.Offer.InterfaceType,
 151                             &newChannel->OfferMsg.Offer.InterfaceType,
 152                             sizeof(struct hv_guid)) &&
 153                     !memcmp(&channel->OfferMsg.Offer.InterfaceInstance,
 154                             &newChannel->OfferMsg.Offer.InterfaceInstance,
 155                             sizeof(struct hv_guid))) {
 156                         fNew = false;
 157                         break;
 158                 }
 159         }
 160
 161         if (fNew)
 162                 list_add_tail(&newChannel->ListEntry,
 163                               &gVmbusConnection.ChannelList);
 164
 165         spin_unlock_irqrestore(&gVmbusConnection.channel_lock, flags);
 166
 167         if (!fNew) {
 168                 DPRINT_DBG(VMBUS, "Ignoring duplicate offer for relid (%d)",
 169                            newChannel->OfferMsg.ChildRelId);
 170                 FreeVmbusChannel(newChannel);
 171                 DPRINT_EXIT(VMBUS);
 172                 return;
 173         }
 174
 175         /*
 176          * Start the process of binding this offer to the driver
 177          * We need to set the DeviceObject field before calling
 178          * VmbusChildDeviceAdd()
 179          */
 180         newChannel->DeviceObject = VmbusChildDeviceCreate(
 181                 &newChannel->OfferMsg.Offer.InterfaceType,
 182                 &newChannel->OfferMsg.Offer.InterfaceInstance,
 183                 newChannel);
 184
 185         DPRINT_DBG(VMBUS, "child device object allocated - %p",
 186                    newChannel->DeviceObject);
 187
 188         /*
 189          * Add the new device to the bus. This will kick off device-driver
 190          * binding which eventually invokes the device driver's AddDevice()
 191          * method.
 192          */
 193         ret = VmbusChildDeviceAdd(newChannel->DeviceObject);
 194         if (ret != 0) {
 195                 DPRINT_ERR(VMBUS,
 196                            "unable to add child device object (relid %d)",
 197                            newChannel->OfferMsg.ChildRelId);
 198
 199                 spin_lock_irqsave(&gVmbusConnection.channel_lock, flags);
 200                 list_del(&newChannel->ListEntry);
 201                 spin_unlock_irqrestore(&gVmbusConnection.channel_lock, flags);
 202
 203                 FreeVmbusChannel(newChannel);
 204         } else {
 205                 /*
 206                  * This state is used to indicate a successful open
 207                  * so that when we do close the channel normally, we
 208                  * can cleanup properly
 209                  */
 210                 newChannel->State = CHANNEL_OPEN_STATE;
 211         }
 212         DPRINT_EXIT(VMBUS);
 213 }
 214
 215 /**
 216  * VmbusChannelProcessRescindOffer - Rescind the offer by initiating a device removal
 217  */
 218 static void VmbusChannelProcessRescindOffer(void *context)
 219 {
 220         struct vmbus_channel *channel = context;
 221
 222         DPRINT_ENTER(VMBUS);
 223         VmbusChildDeviceRemove(channel->DeviceObject);
 224         DPRINT_EXIT(VMBUS);
 225 }
 226
 227 /**
 228  * VmbusChannelOnOffer - Handler for channel offers from vmbus in parent partition.
 229  *
 230  * We ignore all offers except network and storage offers. For each network and
 231  * storage offers, we create a channel object and queue a work item to the
 232  * channel object to process the offer synchronously
 233  */
 234 static void VmbusChannelOnOffer(struct vmbus_channel_message_header *hdr)
 235 {
 236         struct vmbus_channel_offer_channel *offer;
 237         struct vmbus_channel *newChannel;
 238         struct hv_guid *guidType;
 239         struct hv_guid *guidInstance;
 240         int i;
 241         int fSupported = 0;
 242
 243         DPRINT_ENTER(VMBUS);
 244
 245         offer = (struct vmbus_channel_offer_channel *)hdr;
 246         for (i = 0; i < MAX_NUM_DEVICE_CLASSES_SUPPORTED; i++) {
 247                 if (memcmp(&offer->Offer.InterfaceType,
 248                     &gSupportedDeviceClasses[i], sizeof(struct hv_guid)) == 0) {
 249                         fSupported = 1;
 250                         break;
 251                 }
 252         }
 253
 254         if (!fSupported) {
 255                 DPRINT_DBG(VMBUS, "Ignoring channel offer notification for "
 256                            "child relid %d", offer->ChildRelId);
 257                 DPRINT_EXIT(VMBUS);
 258                 return;
 259         }
 260
 261         guidType = &offer->Offer.InterfaceType;
 262         guidInstance = &offer->Offer.InterfaceInstance;
 263
 264         DPRINT_INFO(VMBUS, "Channel offer notification - "
 265                     "child relid %d monitor id %d allocated %d, "
 266                     "type {%02x%02x%02x%02x-%02x%02x-%02x%02x-"
 267                     "%02x%02x%02x%02x%02x%02x%02x%02x} "
 268                     "instance {%02x%02x%02x%02x-%02x%02x-%02x%02x-"
 269                     "%02x%02x%02x%02x%02x%02x%02x%02x}",
 270                     offer->ChildRelId, offer->MonitorId,
 271                     offer->MonitorAllocated,
 272                     guidType->data[3], guidType->data[2],
 273                     guidType->data[1], guidType->data[0],
 274                     guidType->data[5], guidType->data[4],
 275                     guidType->data[7], guidType->data[6],
 276                     guidType->data[8], guidType->data[9],
 277                     guidType->data[10], guidType->data[11],
 278                     guidType->data[12], guidType->data[13],
 279                     guidType->data[14], guidType->data[15],
 280                     guidInstance->data[3], guidInstance->data[2],
 281                     guidInstance->data[1], guidInstance->data[0],
 282                     guidInstance->data[5], guidInstance->data[4],
 283                     guidInstance->data[7], guidInstance->data[6],
 284                     guidInstance->data[8], guidInstance->data[9],
 285                     guidInstance->data[10], guidInstance->data[11],
 286                     guidInstance->data[12], guidInstance->data[13],
 287                     guidInstance->data[14], guidInstance->data[15]);
 288
 289         /* Allocate the channel object and save this offer. */
 290         newChannel = AllocVmbusChannel();
 291         if (!newChannel) {
 292                 DPRINT_ERR(VMBUS, "unable to allocate channel object");
 293                 return;
 294         }
 295
 296         DPRINT_DBG(VMBUS, "channel object allocated - %p", newChannel);
 297
 298         memcpy(&newChannel->OfferMsg, offer,
 299                sizeof(struct vmbus_channel_offer_channel));
 300         newChannel->MonitorGroup = (u8)offer->MonitorId / 32;
 301         newChannel->MonitorBit = (u8)offer->MonitorId % 32;
 302
 303         /* TODO: Make sure the offer comes from our parent partition */
 304         osd_schedule_callback(newChannel->ControlWQ, VmbusChannelProcessOffer,
 305                               newChannel);
 306
 307         DPRINT_EXIT(VMBUS);
 308 }
 309
 310 /**
 311  * VmbusChannelOnOfferRescind - Rescind offer handler.
 312  *
 313  * We queue a work item to process this offer synchronously
 314  */
 315 static void VmbusChannelOnOfferRescind(struct vmbus_channel_message_header *hdr)
 316 {
 317         struct vmbus_channel_rescind_offer *rescind;
 318         struct vmbus_channel *channel;
 319
 320         DPRINT_ENTER(VMBUS);
 321
 322         rescind = (struct vmbus_channel_rescind_offer *)hdr;
 323         channel = GetChannelFromRelId(rescind->ChildRelId);
 324         if (channel == NULL) {
 325                 DPRINT_DBG(VMBUS, "channel not found for relId %d",
 326                            rescind->ChildRelId);
 327                 return;
 328         }
 329
 330         osd_schedule_callback(channel->ControlWQ,
 331                               VmbusChannelProcessRescindOffer,
 332                               channel);
 333
 334         DPRINT_EXIT(VMBUS);
 335 }
 336
 337 /**
 338  * VmbusChannelOnOffersDelivered - This is invoked when all offers have been delivered.
 339  *
 340  * Nothing to do here.
 341  */
 342 static void VmbusChannelOnOffersDelivered(
 343                         struct vmbus_channel_message_header *hdr)
 344 {
 345         DPRINT_ENTER(VMBUS);
 346         DPRINT_EXIT(VMBUS);
 347 }
 348
 349 /**
 350  * VmbusChannelOnOpenResult - Open result handler.
 351  *
 352  * This is invoked when we received a response to our channel open request.
 353  * Find the matching request, copy the response and signal the requesting
 354  * thread.
 355  */
 356 static void VmbusChannelOnOpenResult(struct vmbus_channel_message_header *hdr)
 357 {
 358         struct vmbus_channel_open_result *result;
 359         struct list_head *curr;
 360         struct vmbus_channel_msginfo *msgInfo;
 361         struct vmbus_channel_message_header *requestHeader;
 362         struct vmbus_channel_open_channel *openMsg;
 363         unsigned long flags;
 364
 365         DPRINT_ENTER(VMBUS);
 366
 367         result = (struct vmbus_channel_open_result *)hdr;
 368         DPRINT_DBG(VMBUS, "vmbus open result - %d", result->Status);
 369
 370         /*
 371          * Find the open msg, copy the result and signal/unblock the wait event
 372          */
 373         spin_lock_irqsave(&gVmbusConnection.channelmsg_lock, flags);
 374
 375         list_for_each(curr, &gVmbusConnection.ChannelMsgList) {
 376 /* FIXME: this should probably use list_entry() instead */
 377                 msgInfo = (struct vmbus_channel_msginfo *)curr;
 378                 requestHeader = (struct vmbus_channel_message_header *)msgInfo->Msg;
 379
 380                 if (requestHeader->MessageType == ChannelMessageOpenChannel) {
 381                         openMsg = (struct vmbus_channel_open_channel *)msgInfo->Msg;
 382                         if (openMsg->ChildRelId == result->ChildRelId &&
 383                             openMsg->OpenId == result->OpenId) {
 384                                 memcpy(&msgInfo->Response.OpenResult,
 385                                        result,
 386                                        sizeof(struct vmbus_channel_open_result));
 387                                 osd_WaitEventSet(msgInfo->WaitEvent);
 388                                 break;
 389                         }
 390                 }
 391         }
 392         spin_unlock_irqrestore(&gVmbusConnection.channelmsg_lock, flags);
 393
 394         DPRINT_EXIT(VMBUS);
 395 }
 396
 397 /**
 398  * VmbusChannelOnGpadlCreated - GPADL created handler.
 399  *
 400  * This is invoked when we received a response to our gpadl create request.
 401  * Find the matching request, copy the response and signal the requesting
 402  * thread.
 403  */
 404 static void VmbusChannelOnGpadlCreated(struct vmbus_channel_message_header *hdr)
 405 {
 406         struct vmbus_channel_gpadl_created *gpadlCreated;
 407         struct list_head *curr;
 408         struct vmbus_channel_msginfo *msgInfo;
 409         struct vmbus_channel_message_header *requestHeader;
 410         struct vmbus_channel_gpadl_header *gpadlHeader;
 411         unsigned long flags;
 412
 413         DPRINT_ENTER(VMBUS);
 414
 415         gpadlCreated = (struct vmbus_channel_gpadl_created *)hdr;
 416         DPRINT_DBG(VMBUS, "vmbus gpadl created result - %d",
 417                    gpadlCreated->CreationStatus);
 418
 419         /*
 420          * Find the establish msg, copy the result and signal/unblock the wait
 421          * event
 422          */
 423         spin_lock_irqsave(&gVmbusConnection.channelmsg_lock, flags);
 424
 425         list_for_each(curr, &gVmbusConnection.ChannelMsgList) {
 426 /* FIXME: this should probably use list_entry() instead */
 427                 msgInfo = (struct vmbus_channel_msginfo *)curr;
 428                 requestHeader = (struct vmbus_channel_message_header *)msgInfo->Msg;
 429
 430                 if (requestHeader->MessageType == ChannelMessageGpadlHeader) {
 431                         gpadlHeader = (struct vmbus_channel_gpadl_header *)requestHeader;
 432
 433                         if ((gpadlCreated->ChildRelId ==
 434                              gpadlHeader->ChildRelId) &&
 435                             (gpadlCreated->Gpadl == gpadlHeader->Gpadl)) {
 436                                 memcpy(&msgInfo->Response.GpadlCreated,
 437                                        gpadlCreated,
 438                                        sizeof(struct vmbus_channel_gpadl_created));
 439                                 osd_WaitEventSet(msgInfo->WaitEvent);
 440                                 break;
 441                         }
 442                 }
 443         }
 444         spin_unlock_irqrestore(&gVmbusConnection.channelmsg_lock, flags);
 445
 446         DPRINT_EXIT(VMBUS);
 447 }
 448
 449 /**
 450  * VmbusChannelOnGpadlTorndown - GPADL torndown handler.
 451  *
 452  * This is invoked when we received a response to our gpadl teardown request.
 453  * Find the matching request, copy the response and signal the requesting
 454  * thread.
 455  */
 456 static void VmbusChannelOnGpadlTorndown(
 457                         struct vmbus_channel_message_header *hdr)
 458 {
 459         struct vmbus_channel_gpadl_torndown *gpadlTorndown;
 460         struct list_head *curr;
 461         struct vmbus_channel_msginfo *msgInfo;
 462         struct vmbus_channel_message_header *requestHeader;
 463         struct vmbus_channel_gpadl_teardown *gpadlTeardown;
 464         unsigned long flags;
 465
 466         DPRINT_ENTER(VMBUS);
 467
 468         gpadlTorndown = (struct vmbus_channel_gpadl_torndown *)hdr;
 469
 470         /*
 471          * Find the open msg, copy the result and signal/unblock the wait event
 472          */
 473         spin_lock_irqsave(&gVmbusConnection.channelmsg_lock, flags);
 474
 475         list_for_each(curr, &gVmbusConnection.ChannelMsgList) {
 476 /* FIXME: this should probably use list_entry() instead */
 477                 msgInfo = (struct vmbus_channel_msginfo *)curr;
 478                 requestHeader = (struct vmbus_channel_message_header *)msgInfo->Msg;
 479
 480                 if (requestHeader->MessageType == ChannelMessageGpadlTeardown) {
 481                         gpadlTeardown = (struct vmbus_channel_gpadl_teardown *)requestHeader;
 482
 483                         if (gpadlTorndown->Gpadl == gpadlTeardown->Gpadl) {
 484                                 memcpy(&msgInfo->Response.GpadlTorndown,
 485                                        gpadlTorndown,
 486                                        sizeof(struct vmbus_channel_gpadl_torndown));
 487                                 osd_WaitEventSet(msgInfo->WaitEvent);
 488                                 break;
 489                         }
 490                 }
 491         }
 492         spin_unlock_irqrestore(&gVmbusConnection.channelmsg_lock, flags);
 493
 494         DPRINT_EXIT(VMBUS);
 495 }
 496
 497 /**
 498  * VmbusChannelOnVersionResponse - Version response handler
 499  *
 500  * This is invoked when we received a response to our initiate contact request.
 501  * Find the matching request, copy the response and signal the requesting
 502  * thread.
 503  */
 504 static void VmbusChannelOnVersionResponse(
 505                 struct vmbus_channel_message_header *hdr)
 506 {
 507         struct list_head *curr;
 508         struct vmbus_channel_msginfo *msgInfo;
 509         struct vmbus_channel_message_header *requestHeader;
 510         struct vmbus_channel_initiate_contact *initiate;
 511         struct vmbus_channel_version_response *versionResponse;
 512         unsigned long flags;
 513
 514         DPRINT_ENTER(VMBUS);
 515
 516         versionResponse = (struct vmbus_channel_version_response *)hdr;
 517         spin_lock_irqsave(&gVmbusConnection.channelmsg_lock, flags);
 518
 519         list_for_each(curr, &gVmbusConnection.ChannelMsgList) {
 520 /* FIXME: this should probably use list_entry() instead */
 521                 msgInfo = (struct vmbus_channel_msginfo *)curr;
 522                 requestHeader = (struct vmbus_channel_message_header *)msgInfo->Msg;
 523
 524                 if (requestHeader->MessageType ==
 525                     ChannelMessageInitiateContact) {
 526                         initiate = (struct vmbus_channel_initiate_contact *)requestHeader;
 527                         memcpy(&msgInfo->Response.VersionResponse,
 528                               versionResponse,
 529                               sizeof(struct vmbus_channel_version_response));
 530                         osd_WaitEventSet(msgInfo->WaitEvent);
 531                 }
 532         }
 533         spin_unlock_irqrestore(&gVmbusConnection.channelmsg_lock, flags);
 534
 535         DPRINT_EXIT(VMBUS);
 536 }
 537
 538 /* Channel message dispatch table */
 539 static struct vmbus_channel_message_table_entry
 540         gChannelMessageTable[ChannelMessageCount] = {
 541         {ChannelMessageInvalid,                 NULL},
 542         {ChannelMessageOfferChannel,            VmbusChannelOnOffer},
 543         {ChannelMessageRescindChannelOffer,     VmbusChannelOnOfferRescind},
 544         {ChannelMessageRequestOffers,           NULL},
 545         {ChannelMessageAllOffersDelivered,      VmbusChannelOnOffersDelivered},
 546         {ChannelMessageOpenChannel,             NULL},
 547         {ChannelMessageOpenChannelResult,       VmbusChannelOnOpenResult},
 548         {ChannelMessageCloseChannel,            NULL},
 549         {ChannelMessageGpadlHeader,             NULL},
 550         {ChannelMessageGpadlBody,               NULL},
 551         {ChannelMessageGpadlCreated,            VmbusChannelOnGpadlCreated},
 552         {ChannelMessageGpadlTeardown,           NULL},
 553         {ChannelMessageGpadlTorndown,           VmbusChannelOnGpadlTorndown},
 554         {ChannelMessageRelIdReleased,           NULL},
 555         {ChannelMessageInitiateContact,         NULL},
 556         {ChannelMessageVersionResponse,         VmbusChannelOnVersionResponse},
 557         {ChannelMessageUnload,                  NULL},
 558 };
 559
 560 /**
 561  * VmbusOnChannelMessage - Handler for channel protocol messages.
 562  *
 563  * This is invoked in the vmbus worker thread context.
 564  */
 565 void VmbusOnChannelMessage(void *Context)
 566 {
 567         struct hv_message *msg = Context;
 568         struct vmbus_channel_message_header *hdr;
 569         int size;
 570
 571         DPRINT_ENTER(VMBUS);
 572
 573         hdr = (struct vmbus_channel_message_header *)msg->u.Payload;
 574         size = msg->Header.PayloadSize;
 575
 576         DPRINT_DBG(VMBUS, "message type %d size %d", hdr->MessageType, size);
 577
 578         if (hdr->MessageType >= ChannelMessageCount) {
 579                 DPRINT_ERR(VMBUS,
 580                            "Received invalid channel message type %d size %d",
 581                            hdr->MessageType, size);
 582                 print_hex_dump_bytes("", DUMP_PREFIX_NONE,
 583                                      (unsigned char *)msg->u.Payload, size);
 584                 kfree(msg);
 585                 return;
 586         }
 587
 588         if (gChannelMessageTable[hdr->MessageType].messageHandler)
 589                 gChannelMessageTable[hdr->MessageType].messageHandler(hdr);
 590         else
 591                 DPRINT_ERR(VMBUS, "Unhandled channel message type %d",
 592                            hdr->MessageType);
 593
 594         /* Free the msg that was allocated in VmbusOnMsgDPC() */
 595         kfree(msg);
 596         DPRINT_EXIT(VMBUS);
 597 }
 598
 599 /**
 600  * VmbusChannelRequestOffers - Send a request to get all our pending offers.
 601  */
 602 int VmbusChannelRequestOffers(void)
 603 {
 604         struct vmbus_channel_message_header *msg;
 605         struct vmbus_channel_msginfo *msgInfo;
 606         int ret;
 607
 608         DPRINT_ENTER(VMBUS);
 609
 610         msgInfo = kmalloc(sizeof(*msgInfo) +
 611                           sizeof(struct vmbus_channel_message_header),
 612                           GFP_KERNEL);
 613         ASSERT(msgInfo != NULL);
 614
 615         msgInfo->WaitEvent = osd_WaitEventCreate();
 616         msg = (struct vmbus_channel_message_header *)msgInfo->Msg;
 617
 618         msg->MessageType = ChannelMessageRequestOffers;
 619
 620         /*SpinlockAcquire(gVmbusConnection.channelMsgLock);
 621         INSERT_TAIL_LIST(&gVmbusConnection.channelMsgList,
 622                          &msgInfo->msgListEntry);
 623         SpinlockRelease(gVmbusConnection.channelMsgLock);*/
 624
 625         ret = VmbusPostMessage(msg,
 626                                sizeof(struct vmbus_channel_message_header));
 627         if (ret != 0) {
 628                 DPRINT_ERR(VMBUS, "Unable to request offers - %d", ret);
 629
 630                 /*SpinlockAcquire(gVmbusConnection.channelMsgLock);
 631                 REMOVE_ENTRY_LIST(&msgInfo->msgListEntry);
 632                 SpinlockRelease(gVmbusConnection.channelMsgLock);*/
 633
 634                 goto Cleanup;
 635         }
 636         /* osd_WaitEventWait(msgInfo->waitEvent); */
 637
 638         /*SpinlockAcquire(gVmbusConnection.channelMsgLock);
 639         REMOVE_ENTRY_LIST(&msgInfo->msgListEntry);
 640         SpinlockRelease(gVmbusConnection.channelMsgLock);*/
 641
 642
 643 Cleanup:
 644         if (msgInfo) {
 645                 kfree(msgInfo->WaitEvent);
 646                 kfree(msgInfo);
 647         }
 648
 649         DPRINT_EXIT(VMBUS);
 650         return ret;
 651 }
 652
 653 /**
 654  * VmbusChannelReleaseUnattachedChannels - Release channels that are unattached/unconnected ie (no drivers associated)
 655  */
 656 void VmbusChannelReleaseUnattachedChannels(void)
 657 {
 658         struct vmbus_channel *channel, *pos;
 659         struct vmbus_channel *start = NULL;
 660         unsigned long flags;
 661
 662         spin_lock_irqsave(&gVmbusConnection.channel_lock, flags);
 663
 664         list_for_each_entry_safe(channel, pos, &gVmbusConnection.ChannelList,
 665                                  ListEntry) {
 666                 if (channel == start)
 667                         break;
 668
 669                 if (!channel->DeviceObject->Driver) {
 670                         list_del(&channel->ListEntry);
 671                         DPRINT_INFO(VMBUS,
 672                                     "Releasing unattached device object %p",
 673                                     channel->DeviceObject);
 674
 675                         VmbusChildDeviceRemove(channel->DeviceObject);
 676                         FreeVmbusChannel(channel);
 677                 } else {
 678                         if (!start)
 679                                 start = channel;
 680                 }
 681         }
 682
 683         spin_unlock_irqrestore(&gVmbusConnection.channel_lock, flags);
 684 }
 685
 686 /* eof */