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 inline void release_channel(void *context)
 267 {
 268         struct vmbus_channel *channel = context;
 269
 270         DPRINT_DBG(VMBUS, "releasing channel (%p)", channel);
 271         destroy_workqueue(channel->controlwq);
 272         DPRINT_DBG(VMBUS, "channel released (%p)", channel);
 273
 274         kfree(channel);
 275 }
 276
 277 /*
 278  * free_channel - Release the resources used by the vmbus channel object
 279  */
 280 void free_channel(struct vmbus_channel *channel)
 281 {
 282         del_timer_sync(&channel->poll_timer);
 283
 284         /*
 285          * We have to release the channel's workqueue/thread in the vmbus's
 286          * workqueue/thread context
 287          * ie we can't destroy ourselves.
 288          */
 289         osd_schedule_callback(gVmbusConnection.WorkQueue, release_channel,
 290                               channel);
 291 }
 292
 293
 294 DECLARE_COMPLETION(hv_channel_ready);
 295
 296 /*
 297  * Count initialized channels, and ensure all channels are ready when hv_vmbus
 298  * module loading completes.
 299  */
 300 static void count_hv_channel(void)
 301 {
 302         static int counter;
 303         unsigned long flags;
 304
 305         spin_lock_irqsave(&gVmbusConnection.channel_lock, flags);
 306         if (++counter == MAX_MSG_TYPES)
 307                 complete(&hv_channel_ready);
 308         spin_unlock_irqrestore(&gVmbusConnection.channel_lock, flags);
 309 }
 310
 311
 312 /*
 313  * vmbus_process_offer - Process the offer by creating a channel/device
 314  * associated with this offer
 315  */
 316 static void vmbus_process_offer(void *context)
 317 {
 318         struct vmbus_channel *newchannel = context;
 319         struct vmbus_channel *channel;
 320         bool fnew = true;
 321         int ret;
 322         int cnt;
 323         unsigned long flags;
 324
 325         /* Make sure this is a new offer */
 326         spin_lock_irqsave(&gVmbusConnection.channel_lock, flags);
 327
 328         list_for_each_entry(channel, &gVmbusConnection.ChannelList, listentry) {
 329                 if (!memcmp(&channel->offermsg.offer.InterfaceType,
 330                             &newchannel->offermsg.offer.InterfaceType,
 331                             sizeof(struct hv_guid)) &&
 332                     !memcmp(&channel->offermsg.offer.InterfaceInstance,
 333                             &newchannel->offermsg.offer.InterfaceInstance,
 334                             sizeof(struct hv_guid))) {
 335                         fnew = false;
 336                         break;
 337                 }
 338         }
 339
 340         if (fnew)
 341                 list_add_tail(&newchannel->listentry,
 342                               &gVmbusConnection.ChannelList);
 343
 344         spin_unlock_irqrestore(&gVmbusConnection.channel_lock, flags);
 345
 346         if (!fnew) {
 347                 DPRINT_DBG(VMBUS, "Ignoring duplicate offer for relid (%d)",
 348                            newchannel->offermsg.child_relid);
 349                 free_channel(newchannel);
 350                 return;
 351         }
 352
 353         /*
 354          * Start the process of binding this offer to the driver
 355          * We need to set the DeviceObject field before calling
 356          * VmbusChildDeviceAdd()
 357          */
 358         newchannel->device_obj = vmbus_child_device_create(
 359                 &newchannel->offermsg.offer.InterfaceType,
 360                 &newchannel->offermsg.offer.InterfaceInstance,
 361                 newchannel);
 362
 363         DPRINT_DBG(VMBUS, "child device object allocated - %p",
 364                    newchannel->device_obj);
 365
 366         /*
 367          * Add the new device to the bus. This will kick off device-driver
 368          * binding which eventually invokes the device driver's AddDevice()
 369          * method.
 370          */
 371         ret = VmbusChildDeviceAdd(newchannel->device_obj);
 372         if (ret != 0) {
 373                 DPRINT_ERR(VMBUS,
 374                            "unable to add child device object (relid %d)",
 375                            newchannel->offermsg.child_relid);
 376
 377                 spin_lock_irqsave(&gVmbusConnection.channel_lock, flags);
 378                 list_del(&newchannel->listentry);
 379                 spin_unlock_irqrestore(&gVmbusConnection.channel_lock, flags);
 380
 381                 free_channel(newchannel);
 382         } else {
 383                 /*
 384                  * This state is used to indicate a successful open
 385                  * so that when we do close the channel normally, we
 386                  * can cleanup properly
 387                  */
 388                 newchannel->state = CHANNEL_OPEN_STATE;
 389
 390                 /* Open IC channels */
 391                 for (cnt = 0; cnt < MAX_MSG_TYPES; cnt++) {
 392                         if (memcmp(&newchannel->offermsg.offer.InterfaceType,
 393                                    &hv_cb_utils[cnt].data,
 394                                    sizeof(struct hv_guid)) == 0 &&
 395                                 vmbus_open(newchannel, 2 * PAGE_SIZE,
 396                                                  2 * PAGE_SIZE, NULL, 0,
 397                                                  hv_cb_utils[cnt].callback,
 398                                                  newchannel) == 0) {
 399                                 hv_cb_utils[cnt].channel = newchannel;
 400                                 DPRINT_INFO(VMBUS, "%s",
 401                                                 hv_cb_utils[cnt].log_msg);
 402                                 count_hv_channel();
 403                         }
 404                 }
 405         }
 406 }
 407
 408 /*
 409  * vmbus_process_rescind_offer -
 410  * Rescind the offer by initiating a device removal
 411  */
 412 static void vmbus_process_rescind_offer(void *context)
 413 {
 414         struct vmbus_channel *channel = context;
 415
 416         vmbus_child_device_unregister(channel->device_obj);
 417 }
 418
 419 /*
 420  * vmbus_onoffer - Handler for channel offers from vmbus in parent partition.
 421  *
 422  * We ignore all offers except network and storage offers. For each network and
 423  * storage offers, we create a channel object and queue a work item to the
 424  * channel object to process the offer synchronously
 425  */
 426 static void vmbus_onoffer(struct vmbus_channel_message_header *hdr)
 427 {
 428         struct vmbus_channel_offer_channel *offer;
 429         struct vmbus_channel *newchannel;
 430         struct hv_guid *guidtype;
 431         struct hv_guid *guidinstance;
 432         int i;
 433         int fsupported = 0;
 434
 435         offer = (struct vmbus_channel_offer_channel *)hdr;
 436         for (i = 0; i < MAX_NUM_DEVICE_CLASSES_SUPPORTED; i++) {
 437                 if (memcmp(&offer->offer.InterfaceType,
 438                     &gSupportedDeviceClasses[i], sizeof(struct hv_guid)) == 0) {
 439                         fsupported = 1;
 440                         break;
 441                 }
 442         }
 443
 444         if (!fsupported) {
 445                 DPRINT_DBG(VMBUS, "Ignoring channel offer notification for "
 446                            "child relid %d", offer->child_relid);
 447                 return;
 448         }
 449
 450         guidtype = &offer->offer.InterfaceType;
 451         guidinstance = &offer->offer.InterfaceInstance;
 452
 453         DPRINT_INFO(VMBUS, "Channel offer notification - "
 454                     "child relid %d monitor id %d allocated %d, "
 455                     "type {%02x%02x%02x%02x-%02x%02x-%02x%02x-"
 456                     "%02x%02x%02x%02x%02x%02x%02x%02x} "
 457                     "instance {%02x%02x%02x%02x-%02x%02x-%02x%02x-"
 458                     "%02x%02x%02x%02x%02x%02x%02x%02x}",
 459                     offer->child_relid, offer->monitorid,
 460                     offer->monitor_allocated,
 461                     guidtype->data[3], guidtype->data[2],
 462                     guidtype->data[1], guidtype->data[0],
 463                     guidtype->data[5], guidtype->data[4],
 464                     guidtype->data[7], guidtype->data[6],
 465                     guidtype->data[8], guidtype->data[9],
 466                     guidtype->data[10], guidtype->data[11],
 467                     guidtype->data[12], guidtype->data[13],
 468                     guidtype->data[14], guidtype->data[15],
 469                     guidinstance->data[3], guidinstance->data[2],
 470                     guidinstance->data[1], guidinstance->data[0],
 471                     guidinstance->data[5], guidinstance->data[4],
 472                     guidinstance->data[7], guidinstance->data[6],
 473                     guidinstance->data[8], guidinstance->data[9],
 474                     guidinstance->data[10], guidinstance->data[11],
 475                     guidinstance->data[12], guidinstance->data[13],
 476                     guidinstance->data[14], guidinstance->data[15]);
 477
 478         /* Allocate the channel object and save this offer. */
 479         newchannel = alloc_channel();
 480         if (!newchannel) {
 481                 DPRINT_ERR(VMBUS, "unable to allocate channel object");
 482                 return;
 483         }
 484
 485         DPRINT_DBG(VMBUS, "channel object allocated - %p", newchannel);
 486
 487         memcpy(&newchannel->offermsg, offer,
 488                sizeof(struct vmbus_channel_offer_channel));
 489         newchannel->monitor_grp = (u8)offer->monitorid / 32;
 490         newchannel->monitor_bit = (u8)offer->monitorid % 32;
 491
 492         /* TODO: Make sure the offer comes from our parent partition */
 493         osd_schedule_callback(newchannel->controlwq, vmbus_process_offer,
 494                               newchannel);
 495 }
 496
 497 /*
 498  * vmbus_onoffer_rescind - Rescind offer handler.
 499  *
 500  * We queue a work item to process this offer synchronously
 501  */
 502 static void vmbus_onoffer_rescind(struct vmbus_channel_message_header *hdr)
 503 {
 504         struct vmbus_channel_rescind_offer *rescind;
 505         struct vmbus_channel *channel;
 506
 507         rescind = (struct vmbus_channel_rescind_offer *)hdr;
 508         channel = GetChannelFromRelId(rescind->child_relid);
 509         if (channel == NULL) {
 510                 DPRINT_DBG(VMBUS, "channel not found for relId %d",
 511                            rescind->child_relid);
 512                 return;
 513         }
 514
 515         osd_schedule_callback(channel->controlwq,
 516                               vmbus_process_rescind_offer,
 517                               channel);
 518 }
 519
 520 /*
 521  * vmbus_onoffers_delivered -
 522  * This is invoked when all offers have been delivered.
 523  *
 524  * Nothing to do here.
 525  */
 526 static void vmbus_onoffers_delivered(
 527                         struct vmbus_channel_message_header *hdr)
 528 {
 529 }
 530
 531 /*
 532  * vmbus_onopen_result - Open result handler.
 533  *
 534  * This is invoked when we received a response to our channel open request.
 535  * Find the matching request, copy the response and signal the requesting
 536  * thread.
 537  */
 538 static void vmbus_onopen_result(struct vmbus_channel_message_header *hdr)
 539 {
 540         struct vmbus_channel_open_result *result;
 541         struct list_head *curr;
 542         struct vmbus_channel_msginfo *msginfo;
 543         struct vmbus_channel_message_header *requestheader;
 544         struct vmbus_channel_open_channel *openmsg;
 545         unsigned long flags;
 546
 547         result = (struct vmbus_channel_open_result *)hdr;
 548         DPRINT_DBG(VMBUS, "vmbus open result - %d", result->status);
 549
 550         /*
 551          * Find the open msg, copy the result and signal/unblock the wait event
 552          */
 553         spin_lock_irqsave(&gVmbusConnection.channelmsg_lock, flags);
 554
 555         list_for_each(curr, &gVmbusConnection.ChannelMsgList) {
 556 /* FIXME: this should probably use list_entry() instead */
 557                 msginfo = (struct vmbus_channel_msginfo *)curr;
 558                 requestheader =
 559                         (struct vmbus_channel_message_header *)msginfo->msg;
 560
 561                 if (requestheader->msgtype == CHANNELMSG_OPENCHANNEL) {
 562                         openmsg =
 563                         (struct vmbus_channel_open_channel *)msginfo->msg;
 564                         if (openmsg->child_relid == result->child_relid &&
 565                             openmsg->openid == result->openid) {
 566                                 memcpy(&msginfo->response.open_result,
 567                                        result,
 568                                        sizeof(struct vmbus_channel_open_result));
 569                                 osd_waitevent_set(msginfo->waitevent);
 570                                 break;
 571                         }
 572                 }
 573         }
 574         spin_unlock_irqrestore(&gVmbusConnection.channelmsg_lock, flags);
 575 }
 576
 577 /*
 578  * vmbus_ongpadl_created - GPADL created handler.
 579  *
 580  * This is invoked when we received a response to our gpadl create request.
 581  * Find the matching request, copy the response and signal the requesting
 582  * thread.
 583  */
 584 static void vmbus_ongpadl_created(struct vmbus_channel_message_header *hdr)
 585 {
 586         struct vmbus_channel_gpadl_created *gpadlcreated;
 587         struct list_head *curr;
 588         struct vmbus_channel_msginfo *msginfo;
 589         struct vmbus_channel_message_header *requestheader;
 590         struct vmbus_channel_gpadl_header *gpadlheader;
 591         unsigned long flags;
 592
 593         gpadlcreated = (struct vmbus_channel_gpadl_created *)hdr;
 594         DPRINT_DBG(VMBUS, "vmbus gpadl created result - %d",
 595                    gpadlcreated->creation_status);
 596
 597         /*
 598          * Find the establish msg, copy the result and signal/unblock the wait
 599          * event
 600          */
 601         spin_lock_irqsave(&gVmbusConnection.channelmsg_lock, flags);
 602
 603         list_for_each(curr, &gVmbusConnection.ChannelMsgList) {
 604 /* FIXME: this should probably use list_entry() instead */
 605                 msginfo = (struct vmbus_channel_msginfo *)curr;
 606                 requestheader =
 607                         (struct vmbus_channel_message_header *)msginfo->msg;
 608
 609                 if (requestheader->msgtype == CHANNELMSG_GPADL_HEADER) {
 610                         gpadlheader =
 611                         (struct vmbus_channel_gpadl_header *)requestheader;
 612
 613                         if ((gpadlcreated->child_relid ==
 614                              gpadlheader->child_relid) &&
 615                             (gpadlcreated->gpadl == gpadlheader->gpadl)) {
 616                                 memcpy(&msginfo->response.gpadl_created,
 617                                        gpadlcreated,
 618                                        sizeof(struct vmbus_channel_gpadl_created));
 619                                 osd_waitevent_set(msginfo->waitevent);
 620                                 break;
 621                         }
 622                 }
 623         }
 624         spin_unlock_irqrestore(&gVmbusConnection.channelmsg_lock, flags);
 625 }
 626
 627 /*
 628  * vmbus_ongpadl_torndown - GPADL torndown handler.
 629  *
 630  * This is invoked when we received a response to our gpadl teardown request.
 631  * Find the matching request, copy the response and signal the requesting
 632  * thread.
 633  */
 634 static void vmbus_ongpadl_torndown(
 635                         struct vmbus_channel_message_header *hdr)
 636 {
 637         struct vmbus_channel_gpadl_torndown *gpadl_torndown;
 638         struct list_head *curr;
 639         struct vmbus_channel_msginfo *msginfo;
 640         struct vmbus_channel_message_header *requestheader;
 641         struct vmbus_channel_gpadl_teardown *gpadl_teardown;
 642         unsigned long flags;
 643
 644         gpadl_torndown = (struct vmbus_channel_gpadl_torndown *)hdr;
 645
 646         /*
 647          * Find the open msg, copy the result and signal/unblock the wait event
 648          */
 649         spin_lock_irqsave(&gVmbusConnection.channelmsg_lock, flags);
 650
 651         list_for_each(curr, &gVmbusConnection.ChannelMsgList) {
 652 /* FIXME: this should probably use list_entry() instead */
 653                 msginfo = (struct vmbus_channel_msginfo *)curr;
 654                 requestheader =
 655                         (struct vmbus_channel_message_header *)msginfo->msg;
 656
 657                 if (requestheader->msgtype == CHANNELMSG_GPADL_TEARDOWN) {
 658                         gpadl_teardown =
 659                         (struct vmbus_channel_gpadl_teardown *)requestheader;
 660
 661                         if (gpadl_torndown->gpadl == gpadl_teardown->gpadl) {
 662                                 memcpy(&msginfo->response.gpadl_torndown,
 663                                        gpadl_torndown,
 664                                        sizeof(struct vmbus_channel_gpadl_torndown));
 665                                 osd_waitevent_set(msginfo->waitevent);
 666                                 break;
 667                         }
 668                 }
 669         }
 670         spin_unlock_irqrestore(&gVmbusConnection.channelmsg_lock, flags);
 671 }
 672
 673 /*
 674  * vmbus_onversion_response - Version response handler
 675  *
 676  * This is invoked when we received a response to our initiate contact request.
 677  * Find the matching request, copy the response and signal the requesting
 678  * thread.
 679  */
 680 static void vmbus_onversion_response(
 681                 struct vmbus_channel_message_header *hdr)
 682 {
 683         struct list_head *curr;
 684         struct vmbus_channel_msginfo *msginfo;
 685         struct vmbus_channel_message_header *requestheader;
 686         struct vmbus_channel_initiate_contact *initiate;
 687         struct vmbus_channel_version_response *version_response;
 688         unsigned long flags;
 689
 690         version_response = (struct vmbus_channel_version_response *)hdr;
 691         spin_lock_irqsave(&gVmbusConnection.channelmsg_lock, flags);
 692
 693         list_for_each(curr, &gVmbusConnection.ChannelMsgList) {
 694 /* FIXME: this should probably use list_entry() instead */
 695                 msginfo = (struct vmbus_channel_msginfo *)curr;
 696                 requestheader =
 697                         (struct vmbus_channel_message_header *)msginfo->msg;
 698
 699                 if (requestheader->msgtype ==
 700                     CHANNELMSG_INITIATE_CONTACT) {
 701                         initiate =
 702                         (struct vmbus_channel_initiate_contact *)requestheader;
 703                         memcpy(&msginfo->response.version_response,
 704                               version_response,
 705                               sizeof(struct vmbus_channel_version_response));
 706                         osd_waitevent_set(msginfo->waitevent);
 707                 }
 708         }
 709         spin_unlock_irqrestore(&gVmbusConnection.channelmsg_lock, flags);
 710 }
 711
 712 /* Channel message dispatch table */
 713 static struct vmbus_channel_message_table_entry
 714         gChannelMessageTable[CHANNELMSG_COUNT] = {
 715         {CHANNELMSG_INVALID,                    NULL},
 716         {CHANNELMSG_OFFERCHANNEL,               vmbus_onoffer},
 717         {CHANNELMSG_RESCIND_CHANNELOFFER,       vmbus_onoffer_rescind},
 718         {CHANNELMSG_REQUESTOFFERS,              NULL},
 719         {CHANNELMSG_ALLOFFERS_DELIVERED,        vmbus_onoffers_delivered},
 720         {CHANNELMSG_OPENCHANNEL,                NULL},
 721         {CHANNELMSG_OPENCHANNEL_RESULT, vmbus_onopen_result},
 722         {CHANNELMSG_CLOSECHANNEL,               NULL},
 723         {CHANNELMSG_GPADL_HEADER,               NULL},
 724         {CHANNELMSG_GPADL_BODY,         NULL},
 725         {CHANNELMSG_GPADL_CREATED,              vmbus_ongpadl_created},
 726         {CHANNELMSG_GPADL_TEARDOWN,             NULL},
 727         {CHANNELMSG_GPADL_TORNDOWN,             vmbus_ongpadl_torndown},
 728         {CHANNELMSG_RELID_RELEASED,             NULL},
 729         {CHANNELMSG_INITIATE_CONTACT,           NULL},
 730         {CHANNELMSG_VERSION_RESPONSE,           vmbus_onversion_response},
 731         {CHANNELMSG_UNLOAD,                     NULL},
 732 };
 733
 734 /*
 735  * vmbus_onmessage - Handler for channel protocol messages.
 736  *
 737  * This is invoked in the vmbus worker thread context.
 738  */
 739 void vmbus_onmessage(void *context)
 740 {
 741         struct hv_message *msg = context;
 742         struct vmbus_channel_message_header *hdr;
 743         int size;
 744
 745         hdr = (struct vmbus_channel_message_header *)msg->u.payload;
 746         size = msg->header.payload_size;
 747
 748         DPRINT_DBG(VMBUS, "message type %d size %d", hdr->msgtype, size);
 749
 750         if (hdr->msgtype >= CHANNELMSG_COUNT) {
 751                 DPRINT_ERR(VMBUS,
 752                            "Received invalid channel message type %d size %d",
 753                            hdr->msgtype, size);
 754                 print_hex_dump_bytes("", DUMP_PREFIX_NONE,
 755                                      (unsigned char *)msg->u.payload, size);
 756                 kfree(msg);
 757                 return;
 758         }
 759
 760         if (gChannelMessageTable[hdr->msgtype].messageHandler)
 761                 gChannelMessageTable[hdr->msgtype].messageHandler(hdr);
 762         else
 763                 DPRINT_ERR(VMBUS, "Unhandled channel message type %d",
 764                            hdr->msgtype);
 765
 766         /* Free the msg that was allocated in VmbusOnMsgDPC() */
 767         kfree(msg);
 768 }
 769
 770 /*
 771  * vmbus_request_offers - Send a request to get all our pending offers.
 772  */
 773 int vmbus_request_offers(void)
 774 {
 775         struct vmbus_channel_message_header *msg;
 776         struct vmbus_channel_msginfo *msginfo;
 777         int ret;
 778
 779         msginfo = kmalloc(sizeof(*msginfo) +
 780                           sizeof(struct vmbus_channel_message_header),
 781                           GFP_KERNEL);
 782         if (!msginfo)
 783                 return -ENOMEM;
 784
 785         msginfo->waitevent = osd_waitevent_create();
 786         if (!msginfo->waitevent) {
 787                 kfree(msginfo);
 788                 return -ENOMEM;
 789         }
 790
 791         msg = (struct vmbus_channel_message_header *)msginfo->msg;
 792
 793         msg->msgtype = CHANNELMSG_REQUESTOFFERS;
 794
 795         /*SpinlockAcquire(gVmbusConnection.channelMsgLock);
 796         INSERT_TAIL_LIST(&gVmbusConnection.channelMsgList,
 797                          &msgInfo->msgListEntry);
 798         SpinlockRelease(gVmbusConnection.channelMsgLock);*/
 799
 800         ret = VmbusPostMessage(msg,
 801                                sizeof(struct vmbus_channel_message_header));
 802         if (ret != 0) {
 803                 DPRINT_ERR(VMBUS, "Unable to request offers - %d", ret);
 804
 805                 /*SpinlockAcquire(gVmbusConnection.channelMsgLock);
 806                 REMOVE_ENTRY_LIST(&msgInfo->msgListEntry);
 807                 SpinlockRelease(gVmbusConnection.channelMsgLock);*/
 808
 809                 goto Cleanup;
 810         }
 811         /* osd_waitevent_wait(msgInfo->waitEvent); */
 812
 813         /*SpinlockAcquire(gVmbusConnection.channelMsgLock);
 814         REMOVE_ENTRY_LIST(&msgInfo->msgListEntry);
 815         SpinlockRelease(gVmbusConnection.channelMsgLock);*/
 816
 817
 818 Cleanup:
 819         if (msginfo) {
 820                 kfree(msginfo->waitevent);
 821                 kfree(msginfo);
 822         }
 823
 824         return ret;
 825 }
 826
 827 /*
 828  * vmbus_release_unattached_channels - Release channels that are
 829  * unattached/unconnected ie (no drivers associated)
 830  */
 831 void vmbus_release_unattached_channels(void)
 832 {
 833         struct vmbus_channel *channel, *pos;
 834         struct vmbus_channel *start = NULL;
 835         unsigned long flags;
 836
 837         spin_lock_irqsave(&gVmbusConnection.channel_lock, flags);
 838
 839         list_for_each_entry_safe(channel, pos, &gVmbusConnection.ChannelList,
 840                                  listentry) {
 841                 if (channel == start)
 842                         break;
 843
 844                 if (!channel->device_obj->Driver) {
 845                         list_del(&channel->listentry);
 846                         DPRINT_INFO(VMBUS,
 847                                     "Releasing unattached device object %p",
 848                                     channel->device_obj);
 849
 850                         vmbus_child_device_unregister(channel->device_obj);
 851                         free_channel(channel);
 852                 } else {
 853                         if (!start)
 854                                 start = channel;
 855                 }
 856         }
 857
 858         spin_unlock_irqrestore(&gVmbusConnection.channel_lock, flags);
 859 }
 860
 861 /* eof */