drivers/staging/hv/channel_mgmt.c

   1 /*
   2  * Copyright (c) 2009, Microsoft Corporation.
   3  *
   4  * This program is free software; you can redistribute it and/or modify it
   5  * under the terms and conditions of the GNU General Public License,
   6  * version 2, as published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope it will be useful, but WITHOUT
   9  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  10  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  11  * more details.
  12  *
  13  * You should have received a copy of the GNU General Public License along with
  14  * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
  15  * Place - Suite 330, Boston, MA 02111-1307 USA.
  16  *
  17  * Authors:
  18  *   Haiyang Zhang <haiyangz@microsoft.com>
  19  *   Hank Janssen  <hjanssen@microsoft.com>
  20  */
  21 #include <linux/kernel.h>
  22 #include <linux/mm.h>
  23 #include <linux/slab.h>
  24 #include <linux/list.h>
  25 #include <linux/module.h>
  26 #include <linux/completion.h>
  27 #include "osd.h"
  28 #include "logging.h"
  29 #include "vmbus_private.h"
  30 #include "utils.h"
  31
  32 struct vmbus_channel_message_table_entry {
  33         enum vmbus_channel_message_type messageType;
  34         void (*messageHandler)(struct vmbus_channel_message_header *msg);
  35 };
  36
  37 #define MAX_MSG_TYPES                    4
  38 #define MAX_NUM_DEVICE_CLASSES_SUPPORTED 8
  39
  40 static const struct hv_guid
  41         gSupportedDeviceClasses[MAX_NUM_DEVICE_CLASSES_SUPPORTED] = {
  42         /* {ba6163d9-04a1-4d29-b605-72e2ffb1dc7f} */
  43         /* Storage - SCSI */
  44         {
  45                 .data  = {
  46                         0xd9, 0x63, 0x61, 0xba, 0xa1, 0x04, 0x29, 0x4d,
  47                         0xb6, 0x05, 0x72, 0xe2, 0xff, 0xb1, 0xdc, 0x7f
  48                 }
  49         },
  50
  51         /* {F8615163-DF3E-46c5-913F-F2D2F965ED0E} */
  52         /* Network */
  53         {
  54                 .data = {
  55                         0x63, 0x51, 0x61, 0xF8, 0x3E, 0xDF, 0xc5, 0x46,
  56                         0x91, 0x3F, 0xF2, 0xD2, 0xF9, 0x65, 0xED, 0x0E
  57                 }
  58         },
  59
  60         /* {CFA8B69E-5B4A-4cc0-B98B-8BA1A1F3F95A} */
  61         /* Input */
  62         {
  63                 .data = {
  64                         0x9E, 0xB6, 0xA8, 0xCF, 0x4A, 0x5B, 0xc0, 0x4c,
  65                         0xB9, 0x8B, 0x8B, 0xA1, 0xA1, 0xF3, 0xF9, 0x5A
  66                 }
  67         },
  68
  69         /* {32412632-86cb-44a2-9b5c-50d1417354f5} */
  70         /* IDE */
  71         {
  72                 .data = {
  73                         0x32, 0x26, 0x41, 0x32, 0xcb, 0x86, 0xa2, 0x44,
  74                         0x9b, 0x5c, 0x50, 0xd1, 0x41, 0x73, 0x54, 0xf5
  75                 }
  76         },
  77         /* 0E0B6031-5213-4934-818B-38D90CED39DB */
  78         /* Shutdown */
  79         {
  80                 .data = {
  81                         0x31, 0x60, 0x0B, 0X0E, 0x13, 0x52, 0x34, 0x49,
  82                         0x81, 0x8B, 0x38, 0XD9, 0x0C, 0xED, 0x39, 0xDB
  83                 }
  84         },
  85         /* {9527E630-D0AE-497b-ADCE-E80AB0175CAF} */
  86         /* TimeSync */
  87         {
  88                 .data = {
  89                         0x30, 0xe6, 0x27, 0x95, 0xae, 0xd0, 0x7b, 0x49,
  90                         0xad, 0xce, 0xe8, 0x0a, 0xb0, 0x17, 0x5c, 0xaf
  91                 }
  92         },
  93         /* {57164f39-9115-4e78-ab55-382f3bd5422d} */
  94         /* Heartbeat */
  95         {
  96                 .data = {
  97                         0x39, 0x4f, 0x16, 0x57, 0x15, 0x91, 0x78, 0x4e,
  98                         0xab, 0x55, 0x38, 0x2f, 0x3b, 0xd5, 0x42, 0x2d
  99                 }
 100         },
 101         /* {A9A0F4E7-5A45-4d96-B827-8A841E8C03E6} */
 102         /* KVP */
 103         {
 104                 .data = {
 105                         0xe7, 0xf4, 0xa0, 0xa9, 0x45, 0x5a, 0x96, 0x4d,
 106                         0xb8, 0x27, 0x8a, 0x84, 0x1e, 0x8c, 0x3,  0xe6
 107         }
 108         },
 109
 110 };
 111
 112
 113 /**
 114  * prep_negotiate_resp() - Create default response for Hyper-V Negotiate message
 115  * @icmsghdrp: Pointer to msg header structure
 116  * @icmsg_negotiate: Pointer to negotiate message structure
 117  * @buf: Raw buffer channel data
 118  *
 119  * @icmsghdrp is of type &struct icmsg_hdr.
 120  * @negop is of type &struct icmsg_negotiate.
 121  * Set up and fill in default negotiate response message. This response can
 122  * come from both the vmbus driver and the hv_utils driver. The current api
 123  * will respond properly to both Windows 2008 and Windows 2008-R2 operating
 124  * systems.
 125  *
 126  * Mainly used by Hyper-V drivers.
 127  */
 128 void prep_negotiate_resp(struct icmsg_hdr *icmsghdrp,
 129                              struct icmsg_negotiate *negop,
 130                              u8 *buf)
 131 {
 132         if (icmsghdrp->icmsgtype == ICMSGTYPE_NEGOTIATE) {
 133                 icmsghdrp->icmsgsize = 0x10;
 134
 135                 negop = (struct icmsg_negotiate *)&buf[
 136                         sizeof(struct vmbuspipe_hdr) +
 137                         sizeof(struct icmsg_hdr)];
 138
 139                 if (negop->icframe_vercnt == 2 &&
 140                    negop->icversion_data[1].major == 3) {
 141                         negop->icversion_data[0].major = 3;
 142                         negop->icversion_data[0].minor = 0;
 143                         negop->icversion_data[1].major = 3;
 144                         negop->icversion_data[1].minor = 0;
 145                 } else {
 146                         negop->icversion_data[0].major = 1;
 147                         negop->icversion_data[0].minor = 0;
 148                         negop->icversion_data[1].major = 1;
 149                         negop->icversion_data[1].minor = 0;
 150                 }
 151
 152                 negop->icframe_vercnt = 1;
 153                 negop->icmsg_vercnt = 1;
 154         }
 155 }
 156 EXPORT_SYMBOL(prep_negotiate_resp);
 157
 158 /**
 159  * chn_cb_negotiate() - Default handler for non IDE/SCSI/NETWORK
 160  * Hyper-V requests
 161  * @context: Pointer to argument structure.
 162  *
 163  * Set up the default handler for non device driver specific requests
 164  * from Hyper-V. This stub responds to the default negotiate messages
 165  * that come in for every non IDE/SCSI/Network request.
 166  * This behavior is normally overwritten in the hv_utils driver. That
 167  * driver handles requests like gracefull shutdown, heartbeats etc.
 168  *
 169  * Mainly used by Hyper-V drivers.
 170  */
 171 void chn_cb_negotiate(void *context)
 172 {
 173         struct vmbus_channel *channel = context;
 174         u8 *buf;
 175         u32 buflen, recvlen;
 176         u64 requestid;
 177
 178         struct icmsg_hdr *icmsghdrp;
 179         struct icmsg_negotiate *negop = NULL;
 180
 181         buflen = PAGE_SIZE;
 182         buf = kmalloc(buflen, GFP_ATOMIC);
 183
 184         vmbus_recvpacket(channel, buf, buflen, &recvlen, &requestid);
 185
 186         if (recvlen > 0) {
 187                 icmsghdrp = (struct icmsg_hdr *)&buf[
 188                         sizeof(struct vmbuspipe_hdr)];
 189
 190                 prep_negotiate_resp(icmsghdrp, negop, buf);
 191
 192                 icmsghdrp->icflags = ICMSGHDRFLAG_TRANSACTION
 193                         | ICMSGHDRFLAG_RESPONSE;
 194
 195                 vmbus_sendpacket(channel, buf,
 196                                        recvlen, requestid,
 197                                        VmbusPacketTypeDataInBand, 0);
 198         }
 199
 200         kfree(buf);
 201 }
 202 EXPORT_SYMBOL(chn_cb_negotiate);
 203
 204 /*
 205  * Function table used for message responses for non IDE/SCSI/Network type
 206  * messages. (Such as KVP/Shutdown etc)
 207  */
 208 struct hyperv_service_callback hv_cb_utils[MAX_MSG_TYPES] = {
 209         /* 0E0B6031-5213-4934-818B-38D90CED39DB */
 210         /* Shutdown */
 211         {
 212                 .msg_type = HV_SHUTDOWN_MSG,
 213                 .data = {
 214                         0x31, 0x60, 0x0B, 0X0E, 0x13, 0x52, 0x34, 0x49,
 215                         0x81, 0x8B, 0x38, 0XD9, 0x0C, 0xED, 0x39, 0xDB
 216                 },
 217                 .callback = chn_cb_negotiate,
 218                 .log_msg = "Shutdown channel functionality initialized"
 219         },
 220
 221         /* {9527E630-D0AE-497b-ADCE-E80AB0175CAF} */
 222         /* TimeSync */
 223         {
 224                 .msg_type = HV_TIMESYNC_MSG,
 225                 .data = {
 226                         0x30, 0xe6, 0x27, 0x95, 0xae, 0xd0, 0x7b, 0x49,
 227                         0xad, 0xce, 0xe8, 0x0a, 0xb0, 0x17, 0x5c, 0xaf
 228                 },
 229                 .callback = chn_cb_negotiate,
 230                 .log_msg = "Timesync channel functionality initialized"
 231         },
 232         /* {57164f39-9115-4e78-ab55-382f3bd5422d} */
 233         /* Heartbeat */
 234         {
 235                 .msg_type = HV_HEARTBEAT_MSG,
 236                 .data = {
 237                         0x39, 0x4f, 0x16, 0x57, 0x15, 0x91, 0x78, 0x4e,
 238                         0xab, 0x55, 0x38, 0x2f, 0x3b, 0xd5, 0x42, 0x2d
 239                 },
 240                 .callback = chn_cb_negotiate,
 241                 .log_msg = "Heartbeat channel functionality initialized"
 242         },
 243         /* {A9A0F4E7-5A45-4d96-B827-8A841E8C03E6} */
 244         /* KVP */
 245         {
 246                 .data = {
 247                         0xe7, 0xf4, 0xa0, 0xa9, 0x45, 0x5a, 0x96, 0x4d,
 248                         0xb8, 0x27, 0x8a, 0x84, 0x1e, 0x8c, 0x3,  0xe6
 249                 },
 250                 .callback = chn_cb_negotiate,
 251                 .log_msg = "KVP channel functionality initialized"
 252         },
 253 };
 254 EXPORT_SYMBOL(hv_cb_utils);
 255
 256 /*
 257  * alloc_channel - Allocate and initialize a vmbus channel object
 258  */
 259 static struct vmbus_channel *alloc_channel(void)
 260 {
 261         struct vmbus_channel *channel;
 262
 263         channel = kzalloc(sizeof(*channel), GFP_ATOMIC);
 264         if (!channel)
 265                 return NULL;
 266
 267         spin_lock_init(&channel->inbound_lock);
 268
 269         init_timer(&channel->poll_timer);
 270         channel->poll_timer.data = (unsigned long)channel;
 271         channel->poll_timer.function = vmbus_ontimer;
 272
 273         channel->controlwq = create_workqueue("hv_vmbus_ctl");
 274         if (!channel->controlwq) {
 275                 kfree(channel);
 276                 return NULL;
 277         }
 278
 279         return channel;
 280 }
 281
 282 /*
 283  * release_hannel - Release the vmbus channel object itself
 284  */
 285 static void release_channel(struct work_struct *work)
 286 {
 287         struct vmbus_channel *channel = container_of(work,
 288                                                      struct vmbus_channel,
 289                                                      work);
 290
 291         DPRINT_DBG(VMBUS, "releasing channel (%p)", channel);
 292         destroy_workqueue(channel->controlwq);
 293         DPRINT_DBG(VMBUS, "channel released (%p)", channel);
 294
 295         kfree(channel);
 296 }
 297
 298 /*
 299  * free_channel - Release the resources used by the vmbus channel object
 300  */
 301 void free_channel(struct vmbus_channel *channel)
 302 {
 303         del_timer_sync(&channel->poll_timer);
 304
 305         /*
 306          * We have to release the channel's workqueue/thread in the vmbus's
 307          * workqueue/thread context
 308          * ie we can't destroy ourselves.
 309          */
 310         INIT_WORK(&channel->work, release_channel);
 311         queue_work(gVmbusConnection.WorkQueue, &channel->work);
 312 }
 313
 314
 315 DECLARE_COMPLETION(hv_channel_ready);
 316
 317 /*
 318  * Count initialized channels, and ensure all channels are ready when hv_vmbus
 319  * module loading completes.
 320  */
 321 static void count_hv_channel(void)
 322 {
 323         static int counter;
 324         unsigned long flags;
 325
 326         spin_lock_irqsave(&gVmbusConnection.channel_lock, flags);
 327         if (++counter == MAX_MSG_TYPES)
 328                 complete(&hv_channel_ready);
 329         spin_unlock_irqrestore(&gVmbusConnection.channel_lock, flags);
 330 }
 331
 332 /*
 333  * vmbus_process_rescind_offer -
 334  * Rescind the offer by initiating a device removal
 335  */
 336 static void vmbus_process_rescind_offer(struct work_struct *work)
 337 {
 338         struct vmbus_channel *channel = container_of(work,
 339                                                      struct vmbus_channel,
 340                                                      work);
 341
 342         vmbus_child_device_unregister(channel->device_obj);
 343 }
 344
 345 /*
 346  * vmbus_process_offer - Process the offer by creating a channel/device
 347  * associated with this offer
 348  */
 349 static void vmbus_process_offer(struct work_struct *work)
 350 {
 351         struct vmbus_channel *newchannel = container_of(work,
 352                                                         struct vmbus_channel,
 353                                                         work);
 354         struct vmbus_channel *channel;
 355         bool fnew = true;
 356         int ret;
 357         int cnt;
 358         unsigned long flags;
 359
 360         /* The next possible work is rescind handling */
 361         INIT_WORK(&newchannel->work, vmbus_process_rescind_offer);
 362
 363         /* Make sure this is a new offer */
 364         spin_lock_irqsave(&gVmbusConnection.channel_lock, flags);
 365
 366         list_for_each_entry(channel, &gVmbusConnection.ChannelList, listentry) {
 367                 if (!memcmp(&channel->offermsg.offer.InterfaceType,
 368                             &newchannel->offermsg.offer.InterfaceType,
 369                             sizeof(struct hv_guid)) &&
 370                     !memcmp(&channel->offermsg.offer.InterfaceInstance,
 371                             &newchannel->offermsg.offer.InterfaceInstance,
 372                             sizeof(struct hv_guid))) {
 373                         fnew = false;
 374                         break;
 375                 }
 376         }
 377
 378         if (fnew)
 379                 list_add_tail(&newchannel->listentry,
 380                               &gVmbusConnection.ChannelList);
 381
 382         spin_unlock_irqrestore(&gVmbusConnection.channel_lock, flags);
 383
 384         if (!fnew) {
 385                 DPRINT_DBG(VMBUS, "Ignoring duplicate offer for relid (%d)",
 386                            newchannel->offermsg.child_relid);
 387                 free_channel(newchannel);
 388                 return;
 389         }
 390
 391         /*
 392          * Start the process of binding this offer to the driver
 393          * We need to set the DeviceObject field before calling
 394          * VmbusChildDeviceAdd()
 395          */
 396         newchannel->device_obj = vmbus_child_device_create(
 397                 &newchannel->offermsg.offer.InterfaceType,
 398                 &newchannel->offermsg.offer.InterfaceInstance,
 399                 newchannel);
 400
 401         DPRINT_DBG(VMBUS, "child device object allocated - %p",
 402                    newchannel->device_obj);
 403
 404         /*
 405          * Add the new device to the bus. This will kick off device-driver
 406          * binding which eventually invokes the device driver's AddDevice()
 407          * method.
 408          */
 409         ret = VmbusChildDeviceAdd(newchannel->device_obj);
 410         if (ret != 0) {
 411                 DPRINT_ERR(VMBUS,
 412                            "unable to add child device object (relid %d)",
 413                            newchannel->offermsg.child_relid);
 414
 415                 spin_lock_irqsave(&gVmbusConnection.channel_lock, flags);
 416                 list_del(&newchannel->listentry);
 417                 spin_unlock_irqrestore(&gVmbusConnection.channel_lock, flags);
 418
 419                 free_channel(newchannel);
 420         } else {
 421                 /*
 422                  * This state is used to indicate a successful open
 423                  * so that when we do close the channel normally, we
 424                  * can cleanup properly
 425                  */
 426                 newchannel->state = CHANNEL_OPEN_STATE;
 427
 428                 /* Open IC channels */
 429                 for (cnt = 0; cnt < MAX_MSG_TYPES; cnt++) {
 430                         if (memcmp(&newchannel->offermsg.offer.InterfaceType,
 431                                    &hv_cb_utils[cnt].data,
 432                                    sizeof(struct hv_guid)) == 0 &&
 433                                 vmbus_open(newchannel, 2 * PAGE_SIZE,
 434                                                  2 * PAGE_SIZE, NULL, 0,
 435                                                  hv_cb_utils[cnt].callback,
 436                                                  newchannel) == 0) {
 437                                 hv_cb_utils[cnt].channel = newchannel;
 438                                 DPRINT_INFO(VMBUS, "%s",
 439                                                 hv_cb_utils[cnt].log_msg);
 440                                 count_hv_channel();
 441                         }
 442                 }
 443         }
 444 }
 445
 446 /*
 447  * vmbus_onoffer - Handler for channel offers from vmbus in parent partition.
 448  *
 449  * We ignore all offers except network and storage offers. For each network and
 450  * storage offers, we create a channel object and queue a work item to the
 451  * channel object to process the offer synchronously
 452  */
 453 static void vmbus_onoffer(struct vmbus_channel_message_header *hdr)
 454 {
 455         struct vmbus_channel_offer_channel *offer;
 456         struct vmbus_channel *newchannel;
 457         struct hv_guid *guidtype;
 458         struct hv_guid *guidinstance;
 459         int i;
 460         int fsupported = 0;
 461
 462         offer = (struct vmbus_channel_offer_channel *)hdr;
 463         for (i = 0; i < MAX_NUM_DEVICE_CLASSES_SUPPORTED; i++) {
 464                 if (memcmp(&offer->offer.InterfaceType,
 465                     &gSupportedDeviceClasses[i], sizeof(struct hv_guid)) == 0) {
 466                         fsupported = 1;
 467                         break;
 468                 }
 469         }
 470
 471         if (!fsupported) {
 472                 DPRINT_DBG(VMBUS, "Ignoring channel offer notification for "
 473                            "child relid %d", offer->child_relid);
 474                 return;
 475         }
 476
 477         guidtype = &offer->offer.InterfaceType;
 478         guidinstance = &offer->offer.InterfaceInstance;
 479
 480         DPRINT_INFO(VMBUS, "Channel offer notification - "
 481                     "child relid %d monitor id %d allocated %d, "
 482                     "type {%02x%02x%02x%02x-%02x%02x-%02x%02x-"
 483                     "%02x%02x%02x%02x%02x%02x%02x%02x} "
 484                     "instance {%02x%02x%02x%02x-%02x%02x-%02x%02x-"
 485                     "%02x%02x%02x%02x%02x%02x%02x%02x}",
 486                     offer->child_relid, offer->monitorid,
 487                     offer->monitor_allocated,
 488                     guidtype->data[3], guidtype->data[2],
 489                     guidtype->data[1], guidtype->data[0],
 490                     guidtype->data[5], guidtype->data[4],
 491                     guidtype->data[7], guidtype->data[6],
 492                     guidtype->data[8], guidtype->data[9],
 493                     guidtype->data[10], guidtype->data[11],
 494                     guidtype->data[12], guidtype->data[13],
 495                     guidtype->data[14], guidtype->data[15],
 496                     guidinstance->data[3], guidinstance->data[2],
 497                     guidinstance->data[1], guidinstance->data[0],
 498                     guidinstance->data[5], guidinstance->data[4],
 499                     guidinstance->data[7], guidinstance->data[6],
 500                     guidinstance->data[8], guidinstance->data[9],
 501                     guidinstance->data[10], guidinstance->data[11],
 502                     guidinstance->data[12], guidinstance->data[13],
 503                     guidinstance->data[14], guidinstance->data[15]);
 504
 505         /* Allocate the channel object and save this offer. */
 506         newchannel = alloc_channel();
 507         if (!newchannel) {
 508                 DPRINT_ERR(VMBUS, "unable to allocate channel object");
 509                 return;
 510         }
 511
 512         DPRINT_DBG(VMBUS, "channel object allocated - %p", newchannel);
 513
 514         memcpy(&newchannel->offermsg, offer,
 515                sizeof(struct vmbus_channel_offer_channel));
 516         newchannel->monitor_grp = (u8)offer->monitorid / 32;
 517         newchannel->monitor_bit = (u8)offer->monitorid % 32;
 518
 519         /* TODO: Make sure the offer comes from our parent partition */
 520         INIT_WORK(&newchannel->work, vmbus_process_offer);
 521         queue_work(newchannel->controlwq, &newchannel->work);
 522 }
 523
 524 /*
 525  * vmbus_onoffer_rescind - Rescind offer handler.
 526  *
 527  * We queue a work item to process this offer synchronously
 528  */
 529 static void vmbus_onoffer_rescind(struct vmbus_channel_message_header *hdr)
 530 {
 531         struct vmbus_channel_rescind_offer *rescind;
 532         struct vmbus_channel *channel;
 533
 534         rescind = (struct vmbus_channel_rescind_offer *)hdr;
 535         channel = GetChannelFromRelId(rescind->child_relid);
 536         if (channel == NULL) {
 537                 DPRINT_DBG(VMBUS, "channel not found for relId %d",
 538                            rescind->child_relid);
 539                 return;
 540         }
 541
 542         /* work is initialized for vmbus_process_rescind_offer() from
 543          * vmbus_process_offer() where the channel got created */
 544         queue_work(channel->controlwq, &channel->work);
 545 }
 546
 547 /*
 548  * vmbus_onoffers_delivered -
 549  * This is invoked when all offers have been delivered.
 550  *
 551  * Nothing to do here.
 552  */
 553 static void vmbus_onoffers_delivered(
 554                         struct vmbus_channel_message_header *hdr)
 555 {
 556 }
 557
 558 /*
 559  * vmbus_onopen_result - Open result handler.
 560  *
 561  * This is invoked when we received a response to our channel open request.
 562  * Find the matching request, copy the response and signal the requesting
 563  * thread.
 564  */
 565 static void vmbus_onopen_result(struct vmbus_channel_message_header *hdr)
 566 {
 567         struct vmbus_channel_open_result *result;
 568         struct list_head *curr;
 569         struct vmbus_channel_msginfo *msginfo;
 570         struct vmbus_channel_message_header *requestheader;
 571         struct vmbus_channel_open_channel *openmsg;
 572         unsigned long flags;
 573
 574         result = (struct vmbus_channel_open_result *)hdr;
 575         DPRINT_DBG(VMBUS, "vmbus open result - %d", result->status);
 576
 577         /*
 578          * Find the open msg, copy the result and signal/unblock the wait event
 579          */
 580         spin_lock_irqsave(&gVmbusConnection.channelmsg_lock, flags);
 581
 582         list_for_each(curr, &gVmbusConnection.ChannelMsgList) {
 583 /* FIXME: this should probably use list_entry() instead */
 584                 msginfo = (struct vmbus_channel_msginfo *)curr;
 585                 requestheader =
 586                         (struct vmbus_channel_message_header *)msginfo->msg;
 587
 588                 if (requestheader->msgtype == CHANNELMSG_OPENCHANNEL) {
 589                         openmsg =
 590                         (struct vmbus_channel_open_channel *)msginfo->msg;
 591                         if (openmsg->child_relid == result->child_relid &&
 592                             openmsg->openid == result->openid) {
 593                                 memcpy(&msginfo->response.open_result,
 594                                        result,
 595                                        sizeof(struct vmbus_channel_open_result));
 596                                 osd_waitevent_set(msginfo->waitevent);
 597                                 break;
 598                         }
 599                 }
 600         }
 601         spin_unlock_irqrestore(&gVmbusConnection.channelmsg_lock, flags);
 602 }
 603
 604 /*
 605  * vmbus_ongpadl_created - GPADL created handler.
 606  *
 607  * This is invoked when we received a response to our gpadl create request.
 608  * Find the matching request, copy the response and signal the requesting
 609  * thread.
 610  */
 611 static void vmbus_ongpadl_created(struct vmbus_channel_message_header *hdr)
 612 {
 613         struct vmbus_channel_gpadl_created *gpadlcreated;
 614         struct list_head *curr;
 615         struct vmbus_channel_msginfo *msginfo;
 616         struct vmbus_channel_message_header *requestheader;
 617         struct vmbus_channel_gpadl_header *gpadlheader;
 618         unsigned long flags;
 619
 620         gpadlcreated = (struct vmbus_channel_gpadl_created *)hdr;
 621         DPRINT_DBG(VMBUS, "vmbus gpadl created result - %d",
 622                    gpadlcreated->creation_status);
 623
 624         /*
 625          * Find the establish msg, copy the result and signal/unblock the wait
 626          * event
 627          */
 628         spin_lock_irqsave(&gVmbusConnection.channelmsg_lock, flags);
 629
 630         list_for_each(curr, &gVmbusConnection.ChannelMsgList) {
 631 /* FIXME: this should probably use list_entry() instead */
 632                 msginfo = (struct vmbus_channel_msginfo *)curr;
 633                 requestheader =
 634                         (struct vmbus_channel_message_header *)msginfo->msg;
 635
 636                 if (requestheader->msgtype == CHANNELMSG_GPADL_HEADER) {
 637                         gpadlheader =
 638                         (struct vmbus_channel_gpadl_header *)requestheader;
 639
 640                         if ((gpadlcreated->child_relid ==
 641                              gpadlheader->child_relid) &&
 642                             (gpadlcreated->gpadl == gpadlheader->gpadl)) {
 643                                 memcpy(&msginfo->response.gpadl_created,
 644                                        gpadlcreated,
 645                                        sizeof(struct vmbus_channel_gpadl_created));
 646                                 osd_waitevent_set(msginfo->waitevent);
 647                                 break;
 648                         }
 649                 }
 650         }
 651         spin_unlock_irqrestore(&gVmbusConnection.channelmsg_lock, flags);
 652 }
 653
 654 /*
 655  * vmbus_ongpadl_torndown - GPADL torndown handler.
 656  *
 657  * This is invoked when we received a response to our gpadl teardown request.
 658  * Find the matching request, copy the response and signal the requesting
 659  * thread.
 660  */
 661 static void vmbus_ongpadl_torndown(
 662                         struct vmbus_channel_message_header *hdr)
 663 {
 664         struct vmbus_channel_gpadl_torndown *gpadl_torndown;
 665         struct list_head *curr;
 666         struct vmbus_channel_msginfo *msginfo;
 667         struct vmbus_channel_message_header *requestheader;
 668         struct vmbus_channel_gpadl_teardown *gpadl_teardown;
 669         unsigned long flags;
 670
 671         gpadl_torndown = (struct vmbus_channel_gpadl_torndown *)hdr;
 672
 673         /*
 674          * Find the open msg, copy the result and signal/unblock the wait event
 675          */
 676         spin_lock_irqsave(&gVmbusConnection.channelmsg_lock, flags);
 677
 678         list_for_each(curr, &gVmbusConnection.ChannelMsgList) {
 679 /* FIXME: this should probably use list_entry() instead */
 680                 msginfo = (struct vmbus_channel_msginfo *)curr;
 681                 requestheader =
 682                         (struct vmbus_channel_message_header *)msginfo->msg;
 683
 684                 if (requestheader->msgtype == CHANNELMSG_GPADL_TEARDOWN) {
 685                         gpadl_teardown =
 686                         (struct vmbus_channel_gpadl_teardown *)requestheader;
 687
 688                         if (gpadl_torndown->gpadl == gpadl_teardown->gpadl) {
 689                                 memcpy(&msginfo->response.gpadl_torndown,
 690                                        gpadl_torndown,
 691                                        sizeof(struct vmbus_channel_gpadl_torndown));
 692                                 osd_waitevent_set(msginfo->waitevent);
 693                                 break;
 694                         }
 695                 }
 696         }
 697         spin_unlock_irqrestore(&gVmbusConnection.channelmsg_lock, flags);
 698 }
 699
 700 /*
 701  * vmbus_onversion_response - Version response handler
 702  *
 703  * This is invoked when we received a response to our initiate contact request.
 704  * Find the matching request, copy the response and signal the requesting
 705  * thread.
 706  */
 707 static void vmbus_onversion_response(
 708                 struct vmbus_channel_message_header *hdr)
 709 {
 710         struct list_head *curr;
 711         struct vmbus_channel_msginfo *msginfo;
 712         struct vmbus_channel_message_header *requestheader;
 713         struct vmbus_channel_initiate_contact *initiate;
 714         struct vmbus_channel_version_response *version_response;
 715         unsigned long flags;
 716
 717         version_response = (struct vmbus_channel_version_response *)hdr;
 718         spin_lock_irqsave(&gVmbusConnection.channelmsg_lock, flags);
 719
 720         list_for_each(curr, &gVmbusConnection.ChannelMsgList) {
 721 /* FIXME: this should probably use list_entry() instead */
 722                 msginfo = (struct vmbus_channel_msginfo *)curr;
 723                 requestheader =
 724                         (struct vmbus_channel_message_header *)msginfo->msg;
 725
 726                 if (requestheader->msgtype ==
 727                     CHANNELMSG_INITIATE_CONTACT) {
 728                         initiate =
 729                         (struct vmbus_channel_initiate_contact *)requestheader;
 730                         memcpy(&msginfo->response.version_response,
 731                               version_response,
 732                               sizeof(struct vmbus_channel_version_response));
 733                         osd_waitevent_set(msginfo->waitevent);
 734                 }
 735         }
 736         spin_unlock_irqrestore(&gVmbusConnection.channelmsg_lock, flags);
 737 }
 738
 739 /* Channel message dispatch table */
 740 static struct vmbus_channel_message_table_entry
 741         gChannelMessageTable[CHANNELMSG_COUNT] = {
 742         {CHANNELMSG_INVALID,                    NULL},
 743         {CHANNELMSG_OFFERCHANNEL,               vmbus_onoffer},
 744         {CHANNELMSG_RESCIND_CHANNELOFFER,       vmbus_onoffer_rescind},
 745         {CHANNELMSG_REQUESTOFFERS,              NULL},
 746         {CHANNELMSG_ALLOFFERS_DELIVERED,        vmbus_onoffers_delivered},
 747         {CHANNELMSG_OPENCHANNEL,                NULL},
 748         {CHANNELMSG_OPENCHANNEL_RESULT, vmbus_onopen_result},
 749         {CHANNELMSG_CLOSECHANNEL,               NULL},
 750         {CHANNELMSG_GPADL_HEADER,               NULL},
 751         {CHANNELMSG_GPADL_BODY,         NULL},
 752         {CHANNELMSG_GPADL_CREATED,              vmbus_ongpadl_created},
 753         {CHANNELMSG_GPADL_TEARDOWN,             NULL},
 754         {CHANNELMSG_GPADL_TORNDOWN,             vmbus_ongpadl_torndown},
 755         {CHANNELMSG_RELID_RELEASED,             NULL},
 756         {CHANNELMSG_INITIATE_CONTACT,           NULL},
 757         {CHANNELMSG_VERSION_RESPONSE,           vmbus_onversion_response},
 758         {CHANNELMSG_UNLOAD,                     NULL},
 759 };
 760
 761 /*
 762  * vmbus_onmessage - Handler for channel protocol messages.
 763  *
 764  * This is invoked in the vmbus worker thread context.
 765  */
 766 void vmbus_onmessage(void *context)
 767 {
 768         struct hv_message *msg = context;
 769         struct vmbus_channel_message_header *hdr;
 770         int size;
 771
 772         hdr = (struct vmbus_channel_message_header *)msg->u.payload;
 773         size = msg->header.payload_size;
 774
 775         DPRINT_DBG(VMBUS, "message type %d size %d", hdr->msgtype, size);
 776
 777         if (hdr->msgtype >= CHANNELMSG_COUNT) {
 778                 DPRINT_ERR(VMBUS,
 779                            "Received invalid channel message type %d size %d",
 780                            hdr->msgtype, size);
 781                 print_hex_dump_bytes("", DUMP_PREFIX_NONE,
 782                                      (unsigned char *)msg->u.payload, size);
 783                 return;
 784         }
 785
 786         if (gChannelMessageTable[hdr->msgtype].messageHandler)
 787                 gChannelMessageTable[hdr->msgtype].messageHandler(hdr);
 788         else
 789                 DPRINT_ERR(VMBUS, "Unhandled channel message type %d",
 790                            hdr->msgtype);
 791 }
 792
 793 /*
 794  * vmbus_request_offers - Send a request to get all our pending offers.
 795  */
 796 int vmbus_request_offers(void)
 797 {
 798         struct vmbus_channel_message_header *msg;
 799         struct vmbus_channel_msginfo *msginfo;
 800         int ret;
 801
 802         msginfo = kmalloc(sizeof(*msginfo) +
 803                           sizeof(struct vmbus_channel_message_header),
 804                           GFP_KERNEL);
 805         if (!msginfo)
 806                 return -ENOMEM;
 807
 808         msginfo->waitevent = osd_waitevent_create();
 809         if (!msginfo->waitevent) {
 810                 kfree(msginfo);
 811                 return -ENOMEM;
 812         }
 813
 814         msg = (struct vmbus_channel_message_header *)msginfo->msg;
 815
 816         msg->msgtype = CHANNELMSG_REQUESTOFFERS;
 817
 818         /*SpinlockAcquire(gVmbusConnection.channelMsgLock);
 819         INSERT_TAIL_LIST(&gVmbusConnection.channelMsgList,
 820                          &msgInfo->msgListEntry);
 821         SpinlockRelease(gVmbusConnection.channelMsgLock);*/
 822
 823         ret = VmbusPostMessage(msg,
 824                                sizeof(struct vmbus_channel_message_header));
 825         if (ret != 0) {
 826                 DPRINT_ERR(VMBUS, "Unable to request offers - %d", ret);
 827
 828                 /*SpinlockAcquire(gVmbusConnection.channelMsgLock);
 829                 REMOVE_ENTRY_LIST(&msgInfo->msgListEntry);
 830                 SpinlockRelease(gVmbusConnection.channelMsgLock);*/
 831
 832                 goto Cleanup;
 833         }
 834         /* osd_waitevent_wait(msgInfo->waitEvent); */
 835
 836         /*SpinlockAcquire(gVmbusConnection.channelMsgLock);
 837         REMOVE_ENTRY_LIST(&msgInfo->msgListEntry);
 838         SpinlockRelease(gVmbusConnection.channelMsgLock);*/
 839
 840
 841 Cleanup:
 842         if (msginfo) {
 843                 kfree(msginfo->waitevent);
 844                 kfree(msginfo);
 845         }
 846
 847         return ret;
 848 }
 849
 850 /*
 851  * vmbus_release_unattached_channels - Release channels that are
 852  * unattached/unconnected ie (no drivers associated)
 853  */
 854 void vmbus_release_unattached_channels(void)
 855 {
 856         struct vmbus_channel *channel, *pos;
 857         struct vmbus_channel *start = NULL;
 858         unsigned long flags;
 859
 860         spin_lock_irqsave(&gVmbusConnection.channel_lock, flags);
 861
 862         list_for_each_entry_safe(channel, pos, &gVmbusConnection.ChannelList,
 863                                  listentry) {
 864                 if (channel == start)
 865                         break;
 866
 867                 if (!channel->device_obj->Driver) {
 868                         list_del(&channel->listentry);
 869                         DPRINT_INFO(VMBUS,
 870                                     "Releasing unattached device object %p",
 871                                     channel->device_obj);
 872
 873                         vmbus_child_device_unregister(channel->device_obj);
 874                         free_channel(channel);
 875                 } else {
 876                         if (!start)
 877                                 start = channel;
 878                 }
 879         }
 880
 881         spin_unlock_irqrestore(&gVmbusConnection.channel_lock, flags);
 882 }
 883
 884 /* eof */