SAFE public projects git trees. - safe/jmp/linux-2.6/blob - drivers/staging/hv/ChannelMgmt.c

   1 /*
   2  *
   3  * Copyright (c) 2009, Microsoft Corporation.
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms and conditions of the GNU General Public License,
   7  * version 2, as published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  12  * more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along with
  15  * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
  16  * Place - Suite 330, Boston, MA 02111-1307 USA.
  17  *
  18  * Authors:
  19  *   Haiyang Zhang <haiyangz@microsoft.com>
  20  *   Hank Janssen  <hjanssen@microsoft.com>
  21  *
  22  */
  23
  24
  25 #include <linux/kernel.h>
  26 #include <linux/mm.h>
  27 #include "osd.h"
  28 #include "include/logging.h"
  29
  30 #include "VmbusPrivate.h"
  31
  32 /* Data types */
  33
  34 typedef void (*PFN_CHANNEL_MESSAGE_HANDLER)(struct vmbus_channel_message_header *msg);
  35
  36 typedef struct _VMBUS_CHANNEL_MESSAGE_TABLE_ENTRY {
  37         enum vmbus_channel_message_type messageType;
  38         PFN_CHANNEL_MESSAGE_HANDLER messageHandler;
  39 } VMBUS_CHANNEL_MESSAGE_TABLE_ENTRY;
  40
  41 /* Internal routines */
  42 static void VmbusChannelOnOffer(struct vmbus_channel_message_header *hdr);
  43 static void VmbusChannelOnOpenResult(struct vmbus_channel_message_header *hdr);
  44 static void VmbusChannelOnOfferRescind(struct vmbus_channel_message_header *hdr);
  45 static void VmbusChannelOnGpadlCreated(struct vmbus_channel_message_header *hdr);
  46 static void VmbusChannelOnGpadlTorndown(struct vmbus_channel_message_header *hdr);
  47 static void VmbusChannelOnOffersDelivered(struct vmbus_channel_message_header *hdr);
  48 static void VmbusChannelOnVersionResponse(struct vmbus_channel_message_header *hdr);
  49 static void VmbusChannelProcessOffer(void * context);
  50 static void VmbusChannelProcessRescindOffer(void * context);
  51
  52
  53 /* Globals */
  54
  55 #define MAX_NUM_DEVICE_CLASSES_SUPPORTED 4
  56
  57 static const struct hv_guid gSupportedDeviceClasses[MAX_NUM_DEVICE_CLASSES_SUPPORTED] = {
  58         /* {ba6163d9-04a1-4d29-b605-72e2ffb1dc7f} */
  59         /* Storage - SCSI */
  60         {
  61                 .data  = {
  62                         0xd9, 0x63, 0x61, 0xba, 0xa1, 0x04, 0x29, 0x4d,
  63                         0xb6, 0x05, 0x72, 0xe2, 0xff, 0xb1, 0xdc, 0x7f
  64                 }
  65         },
  66
  67         /* {F8615163-DF3E-46c5-913F-F2D2F965ED0E} */
  68         /* Network */
  69         {
  70                 .data = {
  71                         0x63, 0x51, 0x61, 0xF8, 0x3E, 0xDF, 0xc5, 0x46,
  72                         0x91, 0x3F, 0xF2, 0xD2, 0xF9, 0x65, 0xED, 0x0E
  73                 }
  74         },
  75
  76         /* {CFA8B69E-5B4A-4cc0-B98B-8BA1A1F3F95A} */
  77         /* Input */
  78         {
  79                 .data = {
  80                         0x9E, 0xB6, 0xA8, 0xCF, 0x4A, 0x5B, 0xc0, 0x4c,
  81                         0xB9, 0x8B, 0x8B, 0xA1, 0xA1, 0xF3, 0xF9, 0x5A
  82                 }
  83         },
  84
  85         /* {32412632-86cb-44a2-9b5c-50d1417354f5} */
  86         /* IDE */
  87         {
  88                 .data = {
  89                         0x32, 0x26, 0x41, 0x32, 0xcb, 0x86, 0xa2, 0x44,
  90                         0x9b, 0x5c, 0x50, 0xd1, 0x41, 0x73, 0x54, 0xf5
  91                 }
  92         },
  93 };
  94
  95 /* Channel message dispatch table */
  96 static VMBUS_CHANNEL_MESSAGE_TABLE_ENTRY gChannelMessageTable[ChannelMessageCount]= {
  97     {ChannelMessageInvalid,                                     NULL},
  98     {ChannelMessageOfferChannel,            VmbusChannelOnOffer},
  99     {ChannelMessageRescindChannelOffer,     VmbusChannelOnOfferRescind},
 100     {ChannelMessageRequestOffers,           NULL},
 101     {ChannelMessageAllOffersDelivered,      VmbusChannelOnOffersDelivered},
 102     {ChannelMessageOpenChannel,             NULL},
 103     {ChannelMessageOpenChannelResult,       VmbusChannelOnOpenResult},
 104     {ChannelMessageCloseChannel,            NULL},
 105     {ChannelMessageGpadlHeader,             NULL},
 106     {ChannelMessageGpadlBody,               NULL},
 107         {ChannelMessageGpadlCreated,                    VmbusChannelOnGpadlCreated},
 108     {ChannelMessageGpadlTeardown,           NULL},
 109     {ChannelMessageGpadlTorndown,           VmbusChannelOnGpadlTorndown},
 110     {ChannelMessageRelIdReleased,           NULL},
 111         {ChannelMessageInitiateContact,                 NULL},
 112         {ChannelMessageVersionResponse,                 VmbusChannelOnVersionResponse},
 113         {ChannelMessageUnload,                                  NULL},
 114 };
 115
 116 /*++
 117
 118 Name:
 119         AllocVmbusChannel()
 120
 121 Description:
 122         Allocate and initialize a vmbus channel object
 123
 124 --*/
 125 struct vmbus_channel *AllocVmbusChannel(void)
 126 {
 127         struct vmbus_channel *channel;
 128
 129         channel = kzalloc(sizeof(*channel), GFP_ATOMIC);
 130         if (!channel)
 131         {
 132                 return NULL;
 133         }
 134
 135         spin_lock_init(&channel->inbound_lock);
 136
 137         init_timer(&channel->poll_timer);
 138         channel->poll_timer.data = (unsigned long)channel;
 139         channel->poll_timer.function = VmbusChannelOnTimer;
 140
 141         /* channel->dataWorkQueue = WorkQueueCreate("data"); */
 142         channel->ControlWQ = create_workqueue("hv_vmbus_ctl");
 143         if (!channel->ControlWQ)
 144         {
 145                 kfree(channel);
 146                 return NULL;
 147         }
 148
 149         return channel;
 150 }
 151
 152 /*++
 153
 154 Name:
 155         ReleaseVmbusChannel()
 156
 157 Description:
 158         Release the vmbus channel object itself
 159
 160 --*/
 161 static inline void ReleaseVmbusChannel(void* Context)
 162 {
 163         struct vmbus_channel *channel = Context;
 164
 165         DPRINT_ENTER(VMBUS);
 166
 167         DPRINT_DBG(VMBUS, "releasing channel (%p)", channel);
 168         destroy_workqueue(channel->ControlWQ);
 169         DPRINT_DBG(VMBUS, "channel released (%p)", channel);
 170
 171         kfree(channel);
 172
 173         DPRINT_EXIT(VMBUS);
 174 }
 175
 176 /*++
 177
 178 Name:
 179         FreeVmbusChannel()
 180
 181 Description:
 182         Release the resources used by the vmbus channel object
 183
 184 --*/
 185 void FreeVmbusChannel(struct vmbus_channel *Channel)
 186 {
 187         del_timer(&Channel->poll_timer);
 188
 189         /* We have to release the channel's workqueue/thread in the vmbus's workqueue/thread context */
 190         /* ie we can't destroy ourselves. */
 191         osd_schedule_callback(gVmbusConnection.WorkQueue, ReleaseVmbusChannel,
 192                               (void *)Channel);
 193 }
 194
 195
 196 /*++
 197
 198 Name:
 199         VmbusChannelProcessOffer()
 200
 201 Description:
 202         Process the offer by creating a channel/device associated with this offer
 203
 204 --*/
 205 static void
 206 VmbusChannelProcessOffer(
 207         void * context
 208         )
 209 {
 210         int ret=0;
 211         struct vmbus_channel *newChannel = context;
 212         struct vmbus_channel *channel;
 213         LIST_ENTRY* anchor;
 214         LIST_ENTRY* curr;
 215         bool fNew = true;
 216         unsigned long flags;
 217
 218         DPRINT_ENTER(VMBUS);
 219
 220         /* Make sure this is a new offer */
 221         spin_lock_irqsave(&gVmbusConnection.channel_lock, flags);
 222
 223         ITERATE_LIST_ENTRIES(anchor, curr, &gVmbusConnection.ChannelList)
 224         {
 225                 channel = CONTAINING_RECORD(curr, struct vmbus_channel, ListEntry);
 226
 227                 if (!memcmp(&channel->OfferMsg.Offer.InterfaceType, &newChannel->OfferMsg.Offer.InterfaceType,sizeof(struct hv_guid)) &&
 228                         !memcmp(&channel->OfferMsg.Offer.InterfaceInstance, &newChannel->OfferMsg.Offer.InterfaceInstance, sizeof(struct hv_guid)))
 229                 {
 230                         fNew = false;
 231                         break;
 232                 }
 233         }
 234
 235         if (fNew)
 236         {
 237                 INSERT_TAIL_LIST(&gVmbusConnection.ChannelList, &newChannel->ListEntry);
 238         }
 239         spin_unlock_irqrestore(&gVmbusConnection.channel_lock, flags);
 240
 241         if (!fNew)
 242         {
 243                 DPRINT_DBG(VMBUS, "Ignoring duplicate offer for relid (%d)", newChannel->OfferMsg.ChildRelId);
 244                 FreeVmbusChannel(newChannel);
 245                 DPRINT_EXIT(VMBUS);
 246                 return;
 247         }
 248
 249         /* Start the process of binding this offer to the driver */
 250         /* We need to set the DeviceObject field before calling VmbusChildDeviceAdd() */
 251         newChannel->DeviceObject = VmbusChildDeviceCreate(
 252                 &newChannel->OfferMsg.Offer.InterfaceType,
 253                 &newChannel->OfferMsg.Offer.InterfaceInstance,
 254                 newChannel);
 255
 256         DPRINT_DBG(VMBUS, "child device object allocated - %p", newChannel->DeviceObject);
 257
 258         /*
 259          * Add the new device to the bus. This will kick off device-driver
 260          * binding which eventually invokes the device driver's AddDevice()
 261          * method.
 262          */
 263
 264         ret = VmbusChildDeviceAdd(newChannel->DeviceObject);
 265         if (ret != 0)
 266         {
 267                 DPRINT_ERR(VMBUS, "unable to add child device object (relid %d)",
 268                         newChannel->OfferMsg.ChildRelId);
 269
 270                 spin_lock_irqsave(&gVmbusConnection.channel_lock, flags);
 271                 REMOVE_ENTRY_LIST(&newChannel->ListEntry);
 272                 spin_unlock_irqrestore(&gVmbusConnection.channel_lock, flags);
 273
 274                 FreeVmbusChannel(newChannel);
 275         }
 276         else
 277         {
 278                 /*
 279                  * This state is used to indicate a successful open
 280                  * so that when we do close the channel normally, we
 281                  * can cleanup properly
 282                  */
 283                 newChannel->State = CHANNEL_OPEN_STATE;
 284         }
 285         DPRINT_EXIT(VMBUS);
 286 }
 287
 288 /*++
 289
 290 Name:
 291         VmbusChannelProcessRescindOffer()
 292
 293 Description:
 294         Rescind the offer by initiating a device removal
 295
 296 --*/
 297 static void
 298 VmbusChannelProcessRescindOffer(
 299         void * context
 300         )
 301 {
 302         struct vmbus_channel *channel = context;
 303
 304         DPRINT_ENTER(VMBUS);
 305
 306         VmbusChildDeviceRemove(channel->DeviceObject);
 307
 308         DPRINT_EXIT(VMBUS);
 309 }
 310
 311
 312 /*++
 313
 314 Name:
 315         VmbusChannelOnOffer()
 316
 317 Description:
 318         Handler for channel offers from vmbus in parent partition. We ignore all offers except
 319         network and storage offers. For each network and storage offers, we create a channel object
 320         and queue a work item to the channel object to process the offer synchronously
 321
 322 --*/
 323 static void VmbusChannelOnOffer(struct vmbus_channel_message_header *hdr)
 324 {
 325         struct vmbus_channel_offer_channel *offer = (struct vmbus_channel_offer_channel *)hdr;
 326         struct vmbus_channel *newChannel;
 327
 328         struct hv_guid *guidType;
 329         struct hv_guid *guidInstance;
 330         int i;
 331         int fSupported=0;
 332
 333         DPRINT_ENTER(VMBUS);
 334
 335         for (i=0; i<MAX_NUM_DEVICE_CLASSES_SUPPORTED; i++)
 336         {
 337                 if (memcmp(&offer->Offer.InterfaceType, &gSupportedDeviceClasses[i], sizeof(struct hv_guid)) == 0)
 338                 {
 339                         fSupported = 1;
 340                         break;
 341                 }
 342         }
 343
 344         if (!fSupported)
 345         {
 346                 DPRINT_DBG(VMBUS, "Ignoring channel offer notification for child relid %d", offer->ChildRelId);
 347                 DPRINT_EXIT(VMBUS);
 348
 349                 return;
 350         }
 351
 352         guidType = &offer->Offer.InterfaceType;
 353         guidInstance = &offer->Offer.InterfaceInstance;
 354
 355         DPRINT_INFO(VMBUS, "Channel offer notification - child relid %d monitor id %d allocated %d, "
 356                 "type {%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x%02x%02x} "
 357                 "instance {%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x%02x%02x}",
 358                 offer->ChildRelId,
 359                 offer->MonitorId,
 360                 offer->MonitorAllocated,
 361                 guidType->data[3], guidType->data[2], guidType->data[1], guidType->data[0],
 362                 guidType->data[5], guidType->data[4], guidType->data[7], guidType->data[6],
 363                 guidType->data[8], guidType->data[9], guidType->data[10], guidType->data[11],
 364                 guidType->data[12], guidType->data[13], guidType->data[14], guidType->data[15],
 365                 guidInstance->data[3], guidInstance->data[2], guidInstance->data[1], guidInstance->data[0],
 366                 guidInstance->data[5], guidInstance->data[4], guidInstance->data[7], guidInstance->data[6],
 367                 guidInstance->data[8], guidInstance->data[9], guidInstance->data[10], guidInstance->data[11],
 368                 guidInstance->data[12], guidInstance->data[13], guidInstance->data[14], guidInstance->data[15]);
 369
 370         /* Allocate the channel object and save this offer. */
 371         newChannel = AllocVmbusChannel();
 372         if (!newChannel)
 373         {
 374                 DPRINT_ERR(VMBUS, "unable to allocate channel object");
 375                 return;
 376         }
 377
 378         DPRINT_DBG(VMBUS, "channel object allocated - %p", newChannel);
 379
 380         memcpy(&newChannel->OfferMsg, offer, sizeof(struct vmbus_channel_offer_channel));
 381         newChannel->MonitorGroup = (u8)offer->MonitorId / 32;
 382         newChannel->MonitorBit = (u8)offer->MonitorId % 32;
 383
 384         /* TODO: Make sure the offer comes from our parent partition */
 385         osd_schedule_callback(newChannel->ControlWQ, VmbusChannelProcessOffer,
 386                               newChannel);
 387
 388         DPRINT_EXIT(VMBUS);
 389 }
 390
 391
 392 /*++
 393
 394 Name:
 395         VmbusChannelOnOfferRescind()
 396
 397 Description:
 398         Rescind offer handler. We queue a work item to process this offer
 399         synchronously
 400
 401 --*/
 402 static void VmbusChannelOnOfferRescind(struct vmbus_channel_message_header *hdr)
 403 {
 404         struct vmbus_channel_rescind_offer *rescind = (struct vmbus_channel_rescind_offer *)hdr;
 405         struct vmbus_channel *channel;
 406
 407         DPRINT_ENTER(VMBUS);
 408
 409         channel = GetChannelFromRelId(rescind->ChildRelId);
 410         if (channel == NULL)
 411         {
 412                 DPRINT_DBG(VMBUS, "channel not found for relId %d", rescind->ChildRelId);
 413                 return;
 414         }
 415
 416         osd_schedule_callback(channel->ControlWQ,
 417                               VmbusChannelProcessRescindOffer,
 418                               channel);
 419
 420         DPRINT_EXIT(VMBUS);
 421 }
 422
 423
 424 /*++
 425
 426 Name:
 427         VmbusChannelOnOffersDelivered()
 428
 429 Description:
 430         This is invoked when all offers have been delivered.
 431         Nothing to do here.
 432
 433 --*/
 434 static void VmbusChannelOnOffersDelivered(struct vmbus_channel_message_header *hdr)
 435 {
 436         DPRINT_ENTER(VMBUS);
 437         DPRINT_EXIT(VMBUS);
 438 }
 439
 440
 441 /*++
 442
 443 Name:
 444         VmbusChannelOnOpenResult()
 445
 446 Description:
 447         Open result handler. This is invoked when we received a response
 448         to our channel open request. Find the matching request, copy the
 449         response and signal the requesting thread.
 450
 451 --*/
 452 static void VmbusChannelOnOpenResult(struct vmbus_channel_message_header *hdr)
 453 {
 454         struct vmbus_channel_open_result *result = (struct vmbus_channel_open_result *)hdr;
 455         LIST_ENTRY* anchor;
 456         LIST_ENTRY* curr;
 457         struct vmbus_channel_msginfo *msgInfo;
 458         struct vmbus_channel_message_header *requestHeader;
 459         struct vmbus_channel_open_channel *openMsg;
 460         unsigned long flags;
 461
 462         DPRINT_ENTER(VMBUS);
 463
 464         DPRINT_DBG(VMBUS, "vmbus open result - %d", result->Status);
 465
 466         /* Find the open msg, copy the result and signal/unblock the wait event */
 467         spin_lock_irqsave(&gVmbusConnection.channelmsg_lock, flags);
 468
 469         ITERATE_LIST_ENTRIES(anchor, curr, &gVmbusConnection.ChannelMsgList)
 470         {
 471                 msgInfo = (struct vmbus_channel_msginfo *)curr;
 472                 requestHeader = (struct vmbus_channel_message_header *)msgInfo->Msg;
 473
 474                 if (requestHeader->MessageType == ChannelMessageOpenChannel)
 475                 {
 476                         openMsg = (struct vmbus_channel_open_channel *)msgInfo->Msg;
 477                         if (openMsg->ChildRelId == result->ChildRelId &&
 478                                 openMsg->OpenId == result->OpenId)
 479                         {
 480                                 memcpy(&msgInfo->Response.OpenResult, result, sizeof(struct vmbus_channel_open_result));
 481                                 osd_WaitEventSet(msgInfo->WaitEvent);
 482                                 break;
 483                         }
 484                 }
 485         }
 486         spin_unlock_irqrestore(&gVmbusConnection.channelmsg_lock, flags);
 487
 488         DPRINT_EXIT(VMBUS);
 489 }
 490
 491
 492 /*++
 493
 494 Name:
 495         VmbusChannelOnGpadlCreated()
 496
 497 Description:
 498         GPADL created handler. This is invoked when we received a response
 499         to our gpadl create request. Find the matching request, copy the
 500         response and signal the requesting thread.
 501
 502 --*/
 503 static void VmbusChannelOnGpadlCreated(struct vmbus_channel_message_header *hdr)
 504 {
 505         struct vmbus_channel_gpadl_created *gpadlCreated = (struct vmbus_channel_gpadl_created *)hdr;
 506         LIST_ENTRY *anchor;
 507         LIST_ENTRY *curr;
 508         struct vmbus_channel_msginfo *msgInfo;
 509         struct vmbus_channel_message_header *requestHeader;
 510         struct vmbus_channel_gpadl_header *gpadlHeader;
 511         unsigned long flags;
 512
 513         DPRINT_ENTER(VMBUS);
 514
 515         DPRINT_DBG(VMBUS, "vmbus gpadl created result - %d", gpadlCreated->CreationStatus);
 516
 517         /* Find the establish msg, copy the result and signal/unblock the wait event */
 518         spin_lock_irqsave(&gVmbusConnection.channelmsg_lock, flags);
 519
 520         ITERATE_LIST_ENTRIES(anchor, curr, &gVmbusConnection.ChannelMsgList)
 521         {
 522                 msgInfo = (struct vmbus_channel_msginfo *)curr;
 523                 requestHeader = (struct vmbus_channel_message_header *)msgInfo->Msg;
 524
 525                 if (requestHeader->MessageType == ChannelMessageGpadlHeader)
 526                 {
 527                         gpadlHeader = (struct vmbus_channel_gpadl_header *)requestHeader;
 528
 529                         if ((gpadlCreated->ChildRelId == gpadlHeader->ChildRelId) &&
 530                                         (gpadlCreated->Gpadl == gpadlHeader->Gpadl))
 531                         {
 532                                 memcpy(&msgInfo->Response.GpadlCreated, gpadlCreated, sizeof(struct vmbus_channel_gpadl_created));
 533                                 osd_WaitEventSet(msgInfo->WaitEvent);
 534                                 break;
 535                         }
 536                 }
 537         }
 538         spin_unlock_irqrestore(&gVmbusConnection.channelmsg_lock, flags);
 539
 540         DPRINT_EXIT(VMBUS);
 541 }
 542
 543
 544 /*++
 545
 546 Name:
 547         VmbusChannelOnGpadlTorndown()
 548
 549 Description:
 550         GPADL torndown handler. This is invoked when we received a response
 551         to our gpadl teardown request. Find the matching request, copy the
 552         response and signal the requesting thread.
 553
 554 --*/
 555 static void VmbusChannelOnGpadlTorndown(struct vmbus_channel_message_header *hdr)
 556 {
 557         struct vmbus_channel_gpadl_torndown* gpadlTorndown  = (struct vmbus_channel_gpadl_torndown *)hdr;
 558         LIST_ENTRY* anchor;
 559         LIST_ENTRY* curr;
 560         struct vmbus_channel_msginfo *msgInfo;
 561         struct vmbus_channel_message_header *requestHeader;
 562         struct vmbus_channel_gpadl_teardown *gpadlTeardown;
 563         unsigned long flags;
 564
 565         DPRINT_ENTER(VMBUS);
 566
 567         /* Find the open msg, copy the result and signal/unblock the wait event */
 568         spin_lock_irqsave(&gVmbusConnection.channelmsg_lock, flags);
 569
 570         ITERATE_LIST_ENTRIES(anchor, curr, &gVmbusConnection.ChannelMsgList)
 571         {
 572                 msgInfo = (struct vmbus_channel_msginfo *)curr;
 573                 requestHeader = (struct vmbus_channel_message_header *)msgInfo->Msg;
 574
 575                 if (requestHeader->MessageType == ChannelMessageGpadlTeardown)
 576                 {
 577                         gpadlTeardown = (struct vmbus_channel_gpadl_teardown *)requestHeader;
 578
 579                         if (gpadlTorndown->Gpadl == gpadlTeardown->Gpadl)
 580                         {
 581                                 memcpy(&msgInfo->Response.GpadlTorndown, gpadlTorndown, sizeof(struct vmbus_channel_gpadl_torndown));
 582                                 osd_WaitEventSet(msgInfo->WaitEvent);
 583                                 break;
 584                         }
 585                 }
 586         }
 587         spin_unlock_irqrestore(&gVmbusConnection.channelmsg_lock, flags);
 588
 589         DPRINT_EXIT(VMBUS);
 590 }
 591
 592
 593 /*++
 594
 595 Name:
 596         VmbusChannelOnVersionResponse()
 597
 598 Description:
 599         Version response handler. This is invoked when we received a response
 600         to our initiate contact request. Find the matching request, copy the
 601         response and signal the requesting thread.
 602
 603 --*/
 604 static void VmbusChannelOnVersionResponse(struct vmbus_channel_message_header *hdr)
 605 {
 606         LIST_ENTRY* anchor;
 607         LIST_ENTRY* curr;
 608         struct vmbus_channel_msginfo *msgInfo;
 609         struct vmbus_channel_message_header *requestHeader;
 610         struct vmbus_channel_initiate_contact *initiate;
 611         struct vmbus_channel_version_response *versionResponse  = (struct vmbus_channel_version_response *)hdr;
 612         unsigned long flags;
 613
 614         DPRINT_ENTER(VMBUS);
 615
 616         spin_lock_irqsave(&gVmbusConnection.channelmsg_lock, flags);
 617
 618         ITERATE_LIST_ENTRIES(anchor, curr, &gVmbusConnection.ChannelMsgList)
 619         {
 620                 msgInfo = (struct vmbus_channel_msginfo *)curr;
 621                 requestHeader = (struct vmbus_channel_message_header *)msgInfo->Msg;
 622
 623                 if (requestHeader->MessageType == ChannelMessageInitiateContact)
 624                 {
 625                         initiate = (struct vmbus_channel_initiate_contact *)requestHeader;
 626                         memcpy(&msgInfo->Response.VersionResponse, versionResponse, sizeof(struct vmbus_channel_version_response));
 627                         osd_WaitEventSet(msgInfo->WaitEvent);
 628                 }
 629         }
 630         spin_unlock_irqrestore(&gVmbusConnection.channelmsg_lock, flags);
 631
 632         DPRINT_EXIT(VMBUS);
 633 }
 634
 635
 636 /*++
 637
 638 Name:
 639         VmbusOnChannelMessage()
 640
 641 Description:
 642         Handler for channel protocol messages.
 643         This is invoked in the vmbus worker thread context.
 644
 645 --*/
 646 void VmbusOnChannelMessage(void *Context)
 647 {
 648         struct hv_message *msg = Context;
 649         struct vmbus_channel_message_header *hdr;
 650         int size;
 651
 652         DPRINT_ENTER(VMBUS);
 653
 654         hdr = (struct vmbus_channel_message_header *)msg->u.Payload;
 655         size=msg->Header.PayloadSize;
 656
 657         DPRINT_DBG(VMBUS, "message type %d size %d", hdr->MessageType, size);
 658
 659         if (hdr->MessageType >= ChannelMessageCount)
 660         {
 661                 DPRINT_ERR(VMBUS, "Received invalid channel message type %d size %d", hdr->MessageType, size);
 662                 print_hex_dump_bytes("", DUMP_PREFIX_NONE,
 663                                      (unsigned char *)msg->u.Payload, size);
 664                 kfree(msg);
 665                 return;
 666         }
 667
 668         if (gChannelMessageTable[hdr->MessageType].messageHandler)
 669         {
 670                 gChannelMessageTable[hdr->MessageType].messageHandler(hdr);
 671         }
 672         else
 673         {
 674                 DPRINT_ERR(VMBUS, "Unhandled channel message type %d", hdr->MessageType);
 675         }
 676
 677         /* Free the msg that was allocated in VmbusOnMsgDPC() */
 678         kfree(msg);
 679         DPRINT_EXIT(VMBUS);
 680 }
 681
 682
 683 /*++
 684
 685 Name:
 686         VmbusChannelRequestOffers()
 687
 688 Description:
 689         Send a request to get all our pending offers.
 690
 691 --*/
 692 int VmbusChannelRequestOffers(void)
 693 {
 694         int ret=0;
 695         struct vmbus_channel_message_header *msg;
 696         struct vmbus_channel_msginfo *msgInfo;
 697
 698         DPRINT_ENTER(VMBUS);
 699
 700         msgInfo = kmalloc(sizeof(*msgInfo) + sizeof(struct vmbus_channel_message_header), GFP_KERNEL);
 701         ASSERT(msgInfo != NULL);
 702
 703         msgInfo->WaitEvent = osd_WaitEventCreate();
 704         msg = (struct vmbus_channel_message_header *)msgInfo->Msg;
 705
 706         msg->MessageType = ChannelMessageRequestOffers;
 707
 708         /*SpinlockAcquire(gVmbusConnection.channelMsgLock);
 709         INSERT_TAIL_LIST(&gVmbusConnection.channelMsgList, &msgInfo->msgListEntry);
 710         SpinlockRelease(gVmbusConnection.channelMsgLock);*/
 711
 712         ret = VmbusPostMessage(msg, sizeof(struct vmbus_channel_message_header));
 713         if (ret != 0)
 714         {
 715                 DPRINT_ERR(VMBUS, "Unable to request offers - %d", ret);
 716
 717                 /*SpinlockAcquire(gVmbusConnection.channelMsgLock);
 718                 REMOVE_ENTRY_LIST(&msgInfo->msgListEntry);
 719                 SpinlockRelease(gVmbusConnection.channelMsgLock);*/
 720
 721                 goto Cleanup;
 722         }
 723         /* osd_WaitEventWait(msgInfo->waitEvent); */
 724
 725         /*SpinlockAcquire(gVmbusConnection.channelMsgLock);
 726         REMOVE_ENTRY_LIST(&msgInfo->msgListEntry);
 727         SpinlockRelease(gVmbusConnection.channelMsgLock);*/
 728
 729
 730 Cleanup:
 731         if (msgInfo)
 732         {
 733                 kfree(msgInfo->WaitEvent);
 734                 kfree(msgInfo);
 735         }
 736
 737         DPRINT_EXIT(VMBUS);
 738
 739         return ret;
 740 }
 741
 742 /*++
 743
 744 Name:
 745         VmbusChannelReleaseUnattachedChannels()
 746
 747 Description:
 748         Release channels that are unattached/unconnected ie (no drivers associated)
 749
 750 --*/
 751 void VmbusChannelReleaseUnattachedChannels(void)
 752 {
 753         LIST_ENTRY *entry;
 754         struct vmbus_channel *channel;
 755         struct vmbus_channel *start = NULL;
 756         unsigned long flags;
 757
 758         spin_lock_irqsave(&gVmbusConnection.channel_lock, flags);
 759
 760         while (!IsListEmpty(&gVmbusConnection.ChannelList))
 761         {
 762                 entry = TOP_LIST_ENTRY(&gVmbusConnection.ChannelList);
 763                 channel = CONTAINING_RECORD(entry, struct vmbus_channel, ListEntry);
 764
 765                 if (channel == start)
 766                         break;
 767
 768                 if (!channel->DeviceObject->Driver)
 769                 {
 770                         REMOVE_ENTRY_LIST(&channel->ListEntry);
 771                         DPRINT_INFO(VMBUS, "Releasing unattached device object %p", channel->DeviceObject);
 772
 773                         VmbusChildDeviceRemove(channel->DeviceObject);
 774                         FreeVmbusChannel(channel);
 775                 }
 776                 else
 777                 {
 778                         if (!start)
 779                         {
 780                                 start = channel;
 781                         }
 782                 }
 783         }
 784
 785         spin_unlock_irqrestore(&gVmbusConnection.channel_lock, flags);
 786 }
 787
 788 /* eof */