SAFE public projects git trees. - safe/jmp/linux-2.6/blob - 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 "osd.h"
  24 #include "logging.h"
  25 #include "VmbusPrivate.h"
  26
  27 struct vmbus_channel_message_table_entry {
  28         enum vmbus_channel_message_type messageType;
  29         void (*messageHandler)(struct vmbus_channel_message_header *msg);
  30 };
  31
  32 #define MAX_NUM_DEVICE_CLASSES_SUPPORTED 4
  33 static const struct hv_guid
  34                 gSupportedDeviceClasses[MAX_NUM_DEVICE_CLASSES_SUPPORTED] = {
  35         /* {ba6163d9-04a1-4d29-b605-72e2ffb1dc7f} */
  36         /* Storage - SCSI */
  37         {
  38                 .data  = {
  39                         0xd9, 0x63, 0x61, 0xba, 0xa1, 0x04, 0x29, 0x4d,
  40                         0xb6, 0x05, 0x72, 0xe2, 0xff, 0xb1, 0xdc, 0x7f
  41                 }
  42         },
  43
  44         /* {F8615163-DF3E-46c5-913F-F2D2F965ED0E} */
  45         /* Network */
  46         {
  47                 .data = {
  48                         0x63, 0x51, 0x61, 0xF8, 0x3E, 0xDF, 0xc5, 0x46,
  49                         0x91, 0x3F, 0xF2, 0xD2, 0xF9, 0x65, 0xED, 0x0E
  50                 }
  51         },
  52
  53         /* {CFA8B69E-5B4A-4cc0-B98B-8BA1A1F3F95A} */
  54         /* Input */
  55         {
  56                 .data = {
  57                         0x9E, 0xB6, 0xA8, 0xCF, 0x4A, 0x5B, 0xc0, 0x4c,
  58                         0xB9, 0x8B, 0x8B, 0xA1, 0xA1, 0xF3, 0xF9, 0x5A
  59                 }
  60         },
  61
  62         /* {32412632-86cb-44a2-9b5c-50d1417354f5} */
  63         /* IDE */
  64         {
  65                 .data = {
  66                         0x32, 0x26, 0x41, 0x32, 0xcb, 0x86, 0xa2, 0x44,
  67                         0x9b, 0x5c, 0x50, 0xd1, 0x41, 0x73, 0x54, 0xf5
  68                 }
  69         },
  70 };
  71
  72 /**
  73  * AllocVmbusChannel - Allocate and initialize a vmbus channel object
  74  */
  75 struct vmbus_channel *AllocVmbusChannel(void)
  76 {
  77         struct vmbus_channel *channel;
  78
  79         channel = kzalloc(sizeof(*channel), GFP_ATOMIC);
  80         if (!channel)
  81                 return NULL;
  82
  83         spin_lock_init(&channel->inbound_lock);
  84
  85         init_timer(&channel->poll_timer);
  86         channel->poll_timer.data = (unsigned long)channel;
  87         channel->poll_timer.function = VmbusChannelOnTimer;
  88
  89         channel->ControlWQ = create_workqueue("hv_vmbus_ctl");
  90         if (!channel->ControlWQ) {
  91                 kfree(channel);
  92                 return NULL;
  93         }
  94
  95         return channel;
  96 }
  97
  98 /**
  99  * ReleaseVmbusChannel - Release the vmbus channel object itself
 100  */
 101 static inline void ReleaseVmbusChannel(void *context)
 102 {
 103         struct vmbus_channel *channel = context;
 104
 105         DPRINT_ENTER(VMBUS);
 106
 107         DPRINT_DBG(VMBUS, "releasing channel (%p)", channel);
 108         destroy_workqueue(channel->ControlWQ);
 109         DPRINT_DBG(VMBUS, "channel released (%p)", channel);
 110
 111         kfree(channel);
 112
 113         DPRINT_EXIT(VMBUS);
 114 }
 115
 116 /**
 117  * FreeVmbusChannel - Release the resources used by the vmbus channel object
 118  */
 119 void FreeVmbusChannel(struct vmbus_channel *Channel)
 120 {
 121         del_timer(&Channel->poll_timer);
 122
 123         /*
 124          * We have to release the channel's workqueue/thread in the vmbus's
 125          * workqueue/thread context
 126          * ie we can't destroy ourselves.
 127          */
 128         osd_schedule_callback(gVmbusConnection.WorkQueue, ReleaseVmbusChannel,
 129                               Channel);
 130 }
 131
 132 /**
 133  * VmbusChannelProcessOffer - Process the offer by creating a channel/device associated with this offer
 134  */
 135 static void VmbusChannelProcessOffer(void *context)
 136 {
 137         struct vmbus_channel *newChannel = context;
 138         struct vmbus_channel *channel;
 139         LIST_ENTRY *anchor;
 140         LIST_ENTRY *curr;
 141         bool fNew = true;
 142         int ret;
 143         unsigned long flags;
 144
 145         DPRINT_ENTER(VMBUS);
 146
 147         /* Make sure this is a new offer */
 148         spin_lock_irqsave(&gVmbusConnection.channel_lock, flags);
 149
 150         ITERATE_LIST_ENTRIES(anchor, curr, &gVmbusConnection.ChannelList) {
 151                 channel = CONTAINING_RECORD(curr, struct vmbus_channel,
 152                                             ListEntry);
 153
 154                 if (!memcmp(&channel->OfferMsg.Offer.InterfaceType,
 155                             &newChannel->OfferMsg.Offer.InterfaceType,
 156                             sizeof(struct hv_guid)) &&
 157                     !memcmp(&channel->OfferMsg.Offer.InterfaceInstance,
 158                             &newChannel->OfferMsg.Offer.InterfaceInstance,
 159                             sizeof(struct hv_guid))) {
 160                         fNew = false;
 161                         break;
 162                 }
 163         }
 164
 165         if (fNew)
 166                 INSERT_TAIL_LIST(&gVmbusConnection.ChannelList,
 167                                  &newChannel->ListEntry);
 168
 169         spin_unlock_irqrestore(&gVmbusConnection.channel_lock, flags);
 170
 171         if (!fNew) {
 172                 DPRINT_DBG(VMBUS, "Ignoring duplicate offer for relid (%d)",
 173                            newChannel->OfferMsg.ChildRelId);
 174                 FreeVmbusChannel(newChannel);
 175                 DPRINT_EXIT(VMBUS);
 176                 return;
 177         }
 178
 179         /*
 180          * Start the process of binding this offer to the driver
 181          * We need to set the DeviceObject field before calling
 182          * VmbusChildDeviceAdd()
 183          */
 184         newChannel->DeviceObject = VmbusChildDeviceCreate(
 185                 &newChannel->OfferMsg.Offer.InterfaceType,
 186                 &newChannel->OfferMsg.Offer.InterfaceInstance,
 187                 newChannel);
 188
 189         DPRINT_DBG(VMBUS, "child device object allocated - %p",
 190                    newChannel->DeviceObject);
 191
 192         /*
 193          * Add the new device to the bus. This will kick off device-driver
 194          * binding which eventually invokes the device driver's AddDevice()
 195          * method.
 196          */
 197         ret = VmbusChildDeviceAdd(newChannel->DeviceObject);
 198         if (ret != 0) {
 199                 DPRINT_ERR(VMBUS,
 200                            "unable to add child device object (relid %d)",
 201                            newChannel->OfferMsg.ChildRelId);
 202
 203                 spin_lock_irqsave(&gVmbusConnection.channel_lock, flags);
 204                 REMOVE_ENTRY_LIST(&newChannel->ListEntry);
 205                 spin_unlock_irqrestore(&gVmbusConnection.channel_lock, flags);
 206
 207                 FreeVmbusChannel(newChannel);
 208         } else {
 209                 /*
 210                  * This state is used to indicate a successful open
 211                  * so that when we do close the channel normally, we
 212                  * can cleanup properly
 213                  */
 214                 newChannel->State = CHANNEL_OPEN_STATE;
 215         }
 216         DPRINT_EXIT(VMBUS);
 217 }
 218
 219 /**
 220  * VmbusChannelProcessRescindOffer - Rescind the offer by initiating a device removal
 221  */
 222 static void VmbusChannelProcessRescindOffer(void *context)
 223 {
 224         struct vmbus_channel *channel = context;
 225
 226         DPRINT_ENTER(VMBUS);
 227         VmbusChildDeviceRemove(channel->DeviceObject);
 228         DPRINT_EXIT(VMBUS);
 229 }
 230
 231 /**
 232  * VmbusChannelOnOffer - Handler for channel offers from vmbus in parent partition.
 233  *
 234  * We ignore all offers except network and storage offers. For each network and
 235  * storage offers, we create a channel object and queue a work item to the
 236  * channel object to process the offer synchronously
 237  */
 238 static void VmbusChannelOnOffer(struct vmbus_channel_message_header *hdr)
 239 {
 240         struct vmbus_channel_offer_channel *offer;
 241         struct vmbus_channel *newChannel;
 242         struct hv_guid *guidType;
 243         struct hv_guid *guidInstance;
 244         int i;
 245         int fSupported = 0;
 246
 247         DPRINT_ENTER(VMBUS);
 248
 249         offer = (struct vmbus_channel_offer_channel *)hdr;
 250         for (i = 0; i < MAX_NUM_DEVICE_CLASSES_SUPPORTED; i++) {
 251                 if (memcmp(&offer->Offer.InterfaceType,
 252                     &gSupportedDeviceClasses[i], sizeof(struct hv_guid)) == 0) {
 253                         fSupported = 1;
 254                         break;
 255                 }
 256         }
 257
 258         if (!fSupported) {
 259                 DPRINT_DBG(VMBUS, "Ignoring channel offer notification for "
 260                            "child relid %d", offer->ChildRelId);
 261                 DPRINT_EXIT(VMBUS);
 262                 return;
 263         }
 264
 265         guidType = &offer->Offer.InterfaceType;
 266         guidInstance = &offer->Offer.InterfaceInstance;
 267
 268         DPRINT_INFO(VMBUS, "Channel offer notification - "
 269                     "child relid %d monitor id %d allocated %d, "
 270                     "type {%02x%02x%02x%02x-%02x%02x-%02x%02x-"
 271                     "%02x%02x%02x%02x%02x%02x%02x%02x} "
 272                     "instance {%02x%02x%02x%02x-%02x%02x-%02x%02x-"
 273                     "%02x%02x%02x%02x%02x%02x%02x%02x}",
 274                     offer->ChildRelId, offer->MonitorId,
 275                     offer->MonitorAllocated,
 276                     guidType->data[3], guidType->data[2],
 277                     guidType->data[1], guidType->data[0],
 278                     guidType->data[5], guidType->data[4],
 279                     guidType->data[7], guidType->data[6],
 280                     guidType->data[8], guidType->data[9],
 281                     guidType->data[10], guidType->data[11],
 282                     guidType->data[12], guidType->data[13],
 283                     guidType->data[14], guidType->data[15],
 284                     guidInstance->data[3], guidInstance->data[2],
 285                     guidInstance->data[1], guidInstance->data[0],
 286                     guidInstance->data[5], guidInstance->data[4],
 287                     guidInstance->data[7], guidInstance->data[6],
 288                     guidInstance->data[8], guidInstance->data[9],
 289                     guidInstance->data[10], guidInstance->data[11],
 290                     guidInstance->data[12], guidInstance->data[13],
 291                     guidInstance->data[14], guidInstance->data[15]);
 292
 293         /* Allocate the channel object and save this offer. */
 294         newChannel = AllocVmbusChannel();
 295         if (!newChannel) {
 296                 DPRINT_ERR(VMBUS, "unable to allocate channel object");
 297                 return;
 298         }
 299
 300         DPRINT_DBG(VMBUS, "channel object allocated - %p", newChannel);
 301
 302         memcpy(&newChannel->OfferMsg, offer,
 303                sizeof(struct vmbus_channel_offer_channel));
 304         newChannel->MonitorGroup = (u8)offer->MonitorId / 32;
 305         newChannel->MonitorBit = (u8)offer->MonitorId % 32;
 306
 307         /* TODO: Make sure the offer comes from our parent partition */
 308         osd_schedule_callback(newChannel->ControlWQ, VmbusChannelProcessOffer,
 309                               newChannel);
 310
 311         DPRINT_EXIT(VMBUS);
 312 }
 313
 314 /**
 315  * VmbusChannelOnOfferRescind - Rescind offer handler.
 316  *
 317  * We queue a work item to process this offer synchronously
 318  */
 319 static void VmbusChannelOnOfferRescind(struct vmbus_channel_message_header *hdr)
 320 {
 321         struct vmbus_channel_rescind_offer *rescind;
 322         struct vmbus_channel *channel;
 323
 324         DPRINT_ENTER(VMBUS);
 325
 326         rescind = (struct vmbus_channel_rescind_offer *)hdr;
 327         channel = GetChannelFromRelId(rescind->ChildRelId);
 328         if (channel == NULL) {
 329                 DPRINT_DBG(VMBUS, "channel not found for relId %d",
 330                            rescind->ChildRelId);
 331                 return;
 332         }
 333
 334         osd_schedule_callback(channel->ControlWQ,
 335                               VmbusChannelProcessRescindOffer,
 336                               channel);
 337
 338         DPRINT_EXIT(VMBUS);
 339 }
 340
 341 /**
 342  * VmbusChannelOnOffersDelivered - This is invoked when all offers have been delivered.
 343  *
 344  * Nothing to do here.
 345  */
 346 static void VmbusChannelOnOffersDelivered(
 347                         struct vmbus_channel_message_header *hdr)
 348 {
 349         DPRINT_ENTER(VMBUS);
 350         DPRINT_EXIT(VMBUS);
 351 }
 352
 353 /**
 354  * VmbusChannelOnOpenResult - Open result handler.
 355  *
 356  * This is invoked when we received a response to our channel open request.
 357  * Find the matching request, copy the response and signal the requesting
 358  * thread.
 359  */
 360 static void VmbusChannelOnOpenResult(struct vmbus_channel_message_header *hdr)
 361 {
 362         struct vmbus_channel_open_result *result;
 363         LIST_ENTRY *anchor;
 364         LIST_ENTRY *curr;
 365         struct vmbus_channel_msginfo *msgInfo;
 366         struct vmbus_channel_message_header *requestHeader;
 367         struct vmbus_channel_open_channel *openMsg;
 368         unsigned long flags;
 369
 370         DPRINT_ENTER(VMBUS);
 371
 372         result = (struct vmbus_channel_open_result *)hdr;
 373         DPRINT_DBG(VMBUS, "vmbus open result - %d", result->Status);
 374
 375         /*
 376          * Find the open msg, copy the result and signal/unblock the wait event
 377          */
 378         spin_lock_irqsave(&gVmbusConnection.channelmsg_lock, flags);
 379
 380         ITERATE_LIST_ENTRIES(anchor, curr, &gVmbusConnection.ChannelMsgList) {
 381                 msgInfo = (struct vmbus_channel_msginfo *)curr;
 382                 requestHeader = (struct vmbus_channel_message_header *)msgInfo->Msg;
 383
 384                 if (requestHeader->MessageType == ChannelMessageOpenChannel) {
 385                         openMsg = (struct vmbus_channel_open_channel *)msgInfo->Msg;
 386                         if (openMsg->ChildRelId == result->ChildRelId &&
 387                             openMsg->OpenId == result->OpenId) {
 388                                 memcpy(&msgInfo->Response.OpenResult,
 389                                        result,
 390                                        sizeof(struct vmbus_channel_open_result));
 391                                 osd_WaitEventSet(msgInfo->WaitEvent);
 392                                 break;
 393                         }
 394                 }
 395         }
 396         spin_unlock_irqrestore(&gVmbusConnection.channelmsg_lock, flags);
 397
 398         DPRINT_EXIT(VMBUS);
 399 }
 400
 401 /**
 402  * VmbusChannelOnGpadlCreated - GPADL created handler.
 403  *
 404  * This is invoked when we received a response to our gpadl create request.
 405  * Find the matching request, copy the response and signal the requesting
 406  * thread.
 407  */
 408 static void VmbusChannelOnGpadlCreated(struct vmbus_channel_message_header *hdr)
 409 {
 410         struct vmbus_channel_gpadl_created *gpadlCreated;
 411         LIST_ENTRY *anchor;
 412         LIST_ENTRY *curr;
 413         struct vmbus_channel_msginfo *msgInfo;
 414         struct vmbus_channel_message_header *requestHeader;
 415         struct vmbus_channel_gpadl_header *gpadlHeader;
 416         unsigned long flags;
 417
 418         DPRINT_ENTER(VMBUS);
 419
 420         gpadlCreated = (struct vmbus_channel_gpadl_created *)hdr;
 421         DPRINT_DBG(VMBUS, "vmbus gpadl created result - %d",
 422                    gpadlCreated->CreationStatus);
 423
 424         /*
 425          * Find the establish msg, copy the result and signal/unblock the wait
 426          * event
 427          */
 428         spin_lock_irqsave(&gVmbusConnection.channelmsg_lock, flags);
 429
 430         ITERATE_LIST_ENTRIES(anchor, curr, &gVmbusConnection.ChannelMsgList) {
 431                 msgInfo = (struct vmbus_channel_msginfo *)curr;
 432                 requestHeader = (struct vmbus_channel_message_header *)msgInfo->Msg;
 433
 434                 if (requestHeader->MessageType == ChannelMessageGpadlHeader) {
 435                         gpadlHeader = (struct vmbus_channel_gpadl_header *)requestHeader;
 436
 437                         if ((gpadlCreated->ChildRelId ==
 438                              gpadlHeader->ChildRelId) &&
 439                             (gpadlCreated->Gpadl == gpadlHeader->Gpadl)) {
 440                                 memcpy(&msgInfo->Response.GpadlCreated,
 441                                        gpadlCreated,
 442                                        sizeof(struct vmbus_channel_gpadl_created));
 443                                 osd_WaitEventSet(msgInfo->WaitEvent);
 444                                 break;
 445                         }
 446                 }
 447         }
 448         spin_unlock_irqrestore(&gVmbusConnection.channelmsg_lock, flags);
 449
 450         DPRINT_EXIT(VMBUS);
 451 }
 452
 453 /**
 454  * VmbusChannelOnGpadlTorndown - GPADL torndown handler.
 455  *
 456  * This is invoked when we received a response to our gpadl teardown request.
 457  * Find the matching request, copy the response and signal the requesting
 458  * thread.
 459  */
 460 static void VmbusChannelOnGpadlTorndown(
 461                         struct vmbus_channel_message_header *hdr)
 462 {
 463         struct vmbus_channel_gpadl_torndown *gpadlTorndown;
 464         LIST_ENTRY *anchor;
 465         LIST_ENTRY *curr;
 466         struct vmbus_channel_msginfo *msgInfo;
 467         struct vmbus_channel_message_header *requestHeader;
 468         struct vmbus_channel_gpadl_teardown *gpadlTeardown;
 469         unsigned long flags;
 470
 471         DPRINT_ENTER(VMBUS);
 472
 473         gpadlTorndown = (struct vmbus_channel_gpadl_torndown *)hdr;
 474
 475         /*
 476          * Find the open msg, copy the result and signal/unblock the wait event
 477          */
 478         spin_lock_irqsave(&gVmbusConnection.channelmsg_lock, flags);
 479
 480         ITERATE_LIST_ENTRIES(anchor, curr, &gVmbusConnection.ChannelMsgList) {
 481                 msgInfo = (struct vmbus_channel_msginfo *)curr;
 482                 requestHeader = (struct vmbus_channel_message_header *)msgInfo->Msg;
 483
 484                 if (requestHeader->MessageType == ChannelMessageGpadlTeardown) {
 485                         gpadlTeardown = (struct vmbus_channel_gpadl_teardown *)requestHeader;
 486
 487                         if (gpadlTorndown->Gpadl == gpadlTeardown->Gpadl) {
 488                                 memcpy(&msgInfo->Response.GpadlTorndown,
 489                                        gpadlTorndown,
 490                                        sizeof(struct vmbus_channel_gpadl_torndown));
 491                                 osd_WaitEventSet(msgInfo->WaitEvent);
 492                                 break;
 493                         }
 494                 }
 495         }
 496         spin_unlock_irqrestore(&gVmbusConnection.channelmsg_lock, flags);
 497
 498         DPRINT_EXIT(VMBUS);
 499 }
 500
 501 /**
 502  * VmbusChannelOnVersionResponse - Version response handler
 503  *
 504  * This is invoked when we received a response to our initiate contact request.
 505  * Find the matching request, copy the response and signal the requesting
 506  * thread.
 507  */
 508 static void VmbusChannelOnVersionResponse(
 509                 struct vmbus_channel_message_header *hdr)
 510 {
 511         LIST_ENTRY *anchor;
 512         LIST_ENTRY *curr;
 513         struct vmbus_channel_msginfo *msgInfo;
 514         struct vmbus_channel_message_header *requestHeader;
 515         struct vmbus_channel_initiate_contact *initiate;
 516         struct vmbus_channel_version_response *versionResponse;
 517         unsigned long flags;
 518
 519         DPRINT_ENTER(VMBUS);
 520
 521         versionResponse = (struct vmbus_channel_version_response *)hdr;
 522         spin_lock_irqsave(&gVmbusConnection.channelmsg_lock, flags);
 523
 524         ITERATE_LIST_ENTRIES(anchor, curr, &gVmbusConnection.ChannelMsgList) {
 525                 msgInfo = (struct vmbus_channel_msginfo *)curr;
 526                 requestHeader = (struct vmbus_channel_message_header *)msgInfo->Msg;
 527
 528                 if (requestHeader->MessageType ==
 529                     ChannelMessageInitiateContact) {
 530                         initiate = (struct vmbus_channel_initiate_contact *)requestHeader;
 531                         memcpy(&msgInfo->Response.VersionResponse,
 532                               versionResponse,
 533                               sizeof(struct vmbus_channel_version_response));
 534                         osd_WaitEventSet(msgInfo->WaitEvent);
 535                 }
 536         }
 537         spin_unlock_irqrestore(&gVmbusConnection.channelmsg_lock, flags);
 538
 539         DPRINT_EXIT(VMBUS);
 540 }
 541
 542 /* Channel message dispatch table */
 543 static struct vmbus_channel_message_table_entry
 544         gChannelMessageTable[ChannelMessageCount] = {
 545         {ChannelMessageInvalid,                 NULL},
 546         {ChannelMessageOfferChannel,            VmbusChannelOnOffer},
 547         {ChannelMessageRescindChannelOffer,     VmbusChannelOnOfferRescind},
 548         {ChannelMessageRequestOffers,           NULL},
 549         {ChannelMessageAllOffersDelivered,      VmbusChannelOnOffersDelivered},
 550         {ChannelMessageOpenChannel,             NULL},
 551         {ChannelMessageOpenChannelResult,       VmbusChannelOnOpenResult},
 552         {ChannelMessageCloseChannel,            NULL},
 553         {ChannelMessageGpadlHeader,             NULL},
 554         {ChannelMessageGpadlBody,               NULL},
 555         {ChannelMessageGpadlCreated,            VmbusChannelOnGpadlCreated},
 556         {ChannelMessageGpadlTeardown,           NULL},
 557         {ChannelMessageGpadlTorndown,           VmbusChannelOnGpadlTorndown},
 558         {ChannelMessageRelIdReleased,           NULL},
 559         {ChannelMessageInitiateContact,         NULL},
 560         {ChannelMessageVersionResponse,         VmbusChannelOnVersionResponse},
 561         {ChannelMessageUnload,                  NULL},
 562 };
 563
 564 /**
 565  * VmbusOnChannelMessage - Handler for channel protocol messages.
 566  *
 567  * This is invoked in the vmbus worker thread context.
 568  */
 569 void VmbusOnChannelMessage(void *Context)
 570 {
 571         struct hv_message *msg = Context;
 572         struct vmbus_channel_message_header *hdr;
 573         int size;
 574
 575         DPRINT_ENTER(VMBUS);
 576
 577         hdr = (struct vmbus_channel_message_header *)msg->u.Payload;
 578         size = msg->Header.PayloadSize;
 579
 580         DPRINT_DBG(VMBUS, "message type %d size %d", hdr->MessageType, size);
 581
 582         if (hdr->MessageType >= ChannelMessageCount) {
 583                 DPRINT_ERR(VMBUS,
 584                            "Received invalid channel message type %d size %d",
 585                            hdr->MessageType, size);
 586                 print_hex_dump_bytes("", DUMP_PREFIX_NONE,
 587                                      (unsigned char *)msg->u.Payload, size);
 588                 kfree(msg);
 589                 return;
 590         }
 591
 592         if (gChannelMessageTable[hdr->MessageType].messageHandler)
 593                 gChannelMessageTable[hdr->MessageType].messageHandler(hdr);
 594         else
 595                 DPRINT_ERR(VMBUS, "Unhandled channel message type %d",
 596                            hdr->MessageType);
 597
 598         /* Free the msg that was allocated in VmbusOnMsgDPC() */
 599         kfree(msg);
 600         DPRINT_EXIT(VMBUS);
 601 }
 602
 603 /**
 604  * VmbusChannelRequestOffers - Send a request to get all our pending offers.
 605  */
 606 int VmbusChannelRequestOffers(void)
 607 {
 608         struct vmbus_channel_message_header *msg;
 609         struct vmbus_channel_msginfo *msgInfo;
 610         int ret;
 611
 612         DPRINT_ENTER(VMBUS);
 613
 614         msgInfo = kmalloc(sizeof(*msgInfo) +
 615                           sizeof(struct vmbus_channel_message_header),
 616                           GFP_KERNEL);
 617         ASSERT(msgInfo != NULL);
 618
 619         msgInfo->WaitEvent = osd_WaitEventCreate();
 620         msg = (struct vmbus_channel_message_header *)msgInfo->Msg;
 621
 622         msg->MessageType = ChannelMessageRequestOffers;
 623
 624         /*SpinlockAcquire(gVmbusConnection.channelMsgLock);
 625         INSERT_TAIL_LIST(&gVmbusConnection.channelMsgList,
 626                          &msgInfo->msgListEntry);
 627         SpinlockRelease(gVmbusConnection.channelMsgLock);*/
 628
 629         ret = VmbusPostMessage(msg,
 630                                sizeof(struct vmbus_channel_message_header));
 631         if (ret != 0) {
 632                 DPRINT_ERR(VMBUS, "Unable to request offers - %d", ret);
 633
 634                 /*SpinlockAcquire(gVmbusConnection.channelMsgLock);
 635                 REMOVE_ENTRY_LIST(&msgInfo->msgListEntry);
 636                 SpinlockRelease(gVmbusConnection.channelMsgLock);*/
 637
 638                 goto Cleanup;
 639         }
 640         /* osd_WaitEventWait(msgInfo->waitEvent); */
 641
 642         /*SpinlockAcquire(gVmbusConnection.channelMsgLock);
 643         REMOVE_ENTRY_LIST(&msgInfo->msgListEntry);
 644         SpinlockRelease(gVmbusConnection.channelMsgLock);*/
 645
 646
 647 Cleanup:
 648         if (msgInfo) {
 649                 kfree(msgInfo->WaitEvent);
 650                 kfree(msgInfo);
 651         }
 652
 653         DPRINT_EXIT(VMBUS);
 654         return ret;
 655 }
 656
 657 /**
 658  * VmbusChannelReleaseUnattachedChannels - Release channels that are unattached/unconnected ie (no drivers associated)
 659  */
 660 void VmbusChannelReleaseUnattachedChannels(void)
 661 {
 662         LIST_ENTRY *entry;
 663         struct vmbus_channel *channel;
 664         struct vmbus_channel *start = NULL;
 665         unsigned long flags;
 666
 667         spin_lock_irqsave(&gVmbusConnection.channel_lock, flags);
 668
 669         while (!IsListEmpty(&gVmbusConnection.ChannelList)) {
 670                 entry = TOP_LIST_ENTRY(&gVmbusConnection.ChannelList);
 671                 channel = CONTAINING_RECORD(entry, struct vmbus_channel,
 672                                             ListEntry);
 673
 674                 if (channel == start)
 675                         break;
 676
 677                 if (!channel->DeviceObject->Driver) {
 678                         REMOVE_ENTRY_LIST(&channel->ListEntry);
 679                         DPRINT_INFO(VMBUS,
 680                                     "Releasing unattached device object %p",
 681                                     channel->DeviceObject);
 682
 683                         VmbusChildDeviceRemove(channel->DeviceObject);
 684                         FreeVmbusChannel(channel);
 685                 } else {
 686                         if (!start)
 687                                 start = channel;
 688                 }
 689         }
 690
 691         spin_unlock_irqrestore(&gVmbusConnection.channel_lock, flags);
 692 }
 693
 694 /* eof */