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