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