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/sched.h>
  23 #include <linux/wait.h>
  24 #include <linux/mm.h>
  25 #include <linux/slab.h>
  26 #include <linux/list.h>
  27 #include <linux/module.h>
  28 #include <linux/completion.h>
  29 #include "hv_api.h"
  30 #include "logging.h"
  31 #include "vmbus_private.h"
  32 #include "utils.h"
  33
  34 struct vmbus_channel_message_table_entry {
  35         enum vmbus_channel_message_type messageType;
  36         void (*messageHandler)(struct vmbus_channel_message_header *msg);
  37 };
  38
  39 #define MAX_MSG_TYPES                    4
  40 #define MAX_NUM_DEVICE_CLASSES_SUPPORTED 8
  41
  42 static const struct hv_guid
  43         gSupportedDeviceClasses[MAX_NUM_DEVICE_CLASSES_SUPPORTED] = {
  44         /* {ba6163d9-04a1-4d29-b605-72e2ffb1dc7f} */
  45         /* Storage - SCSI */
  46         {
  47                 .data  = {
  48                         0xd9, 0x63, 0x61, 0xba, 0xa1, 0x04, 0x29, 0x4d,
  49                         0xb6, 0x05, 0x72, 0xe2, 0xff, 0xb1, 0xdc, 0x7f
  50                 }
  51         },
  52
  53         /* {F8615163-DF3E-46c5-913F-F2D2F965ED0E} */
  54         /* Network */
  55         {
  56                 .data = {
  57                         0x63, 0x51, 0x61, 0xF8, 0x3E, 0xDF, 0xc5, 0x46,
  58                         0x91, 0x3F, 0xF2, 0xD2, 0xF9, 0x65, 0xED, 0x0E
  59                 }
  60         },
  61
  62         /* {CFA8B69E-5B4A-4cc0-B98B-8BA1A1F3F95A} */
  63         /* Input */
  64         {
  65                 .data = {
  66                         0x9E, 0xB6, 0xA8, 0xCF, 0x4A, 0x5B, 0xc0, 0x4c,
  67                         0xB9, 0x8B, 0x8B, 0xA1, 0xA1, 0xF3, 0xF9, 0x5A
  68                 }
  69         },
  70
  71         /* {32412632-86cb-44a2-9b5c-50d1417354f5} */
  72         /* IDE */
  73         {
  74                 .data = {
  75                         0x32, 0x26, 0x41, 0x32, 0xcb, 0x86, 0xa2, 0x44,
  76                         0x9b, 0x5c, 0x50, 0xd1, 0x41, 0x73, 0x54, 0xf5
  77                 }
  78         },
  79         /* 0E0B6031-5213-4934-818B-38D90CED39DB */
  80         /* Shutdown */
  81         {
  82                 .data = {
  83                         0x31, 0x60, 0x0B, 0X0E, 0x13, 0x52, 0x34, 0x49,
  84                         0x81, 0x8B, 0x38, 0XD9, 0x0C, 0xED, 0x39, 0xDB
  85                 }
  86         },
  87         /* {9527E630-D0AE-497b-ADCE-E80AB0175CAF} */
  88         /* TimeSync */
  89         {
  90                 .data = {
  91                         0x30, 0xe6, 0x27, 0x95, 0xae, 0xd0, 0x7b, 0x49,
  92                         0xad, 0xce, 0xe8, 0x0a, 0xb0, 0x17, 0x5c, 0xaf
  93                 }
  94         },
  95         /* {57164f39-9115-4e78-ab55-382f3bd5422d} */
  96         /* Heartbeat */
  97         {
  98                 .data = {
  99                         0x39, 0x4f, 0x16, 0x57, 0x15, 0x91, 0x78, 0x4e,
 100                         0xab, 0x55, 0x38, 0x2f, 0x3b, 0xd5, 0x42, 0x2d
 101                 }
 102         },
 103         /* {A9A0F4E7-5A45-4d96-B827-8A841E8C03E6} */
 104         /* KVP */
 105         {
 106                 .data = {
 107                         0xe7, 0xf4, 0xa0, 0xa9, 0x45, 0x5a, 0x96, 0x4d,
 108                         0xb8, 0x27, 0x8a, 0x84, 0x1e, 0x8c, 0x3,  0xe6
 109         }
 110         },
 111
 112 };
 113
 114
 115 /**
 116  * prep_negotiate_resp() - Create default response for Hyper-V Negotiate message
 117  * @icmsghdrp: Pointer to msg header structure
 118  * @icmsg_negotiate: Pointer to negotiate message structure
 119  * @buf: Raw buffer channel data
 120  *
 121  * @icmsghdrp is of type &struct icmsg_hdr.
 122  * @negop is of type &struct icmsg_negotiate.
 123  * Set up and fill in default negotiate response message. This response can
 124  * come from both the vmbus driver and the hv_utils driver. The current api
 125  * will respond properly to both Windows 2008 and Windows 2008-R2 operating
 126  * systems.
 127  *
 128  * Mainly used by Hyper-V drivers.
 129  */
 130 void prep_negotiate_resp(struct icmsg_hdr *icmsghdrp,
 131                              struct icmsg_negotiate *negop,
 132                              u8 *buf)
 133 {
 134         if (icmsghdrp->icmsgtype == ICMSGTYPE_NEGOTIATE) {
 135                 icmsghdrp->icmsgsize = 0x10;
 136
 137                 negop = (struct icmsg_negotiate *)&buf[
 138                         sizeof(struct vmbuspipe_hdr) +
 139                         sizeof(struct icmsg_hdr)];
 140
 141                 if (negop->icframe_vercnt == 2 &&
 142                    negop->icversion_data[1].major == 3) {
 143                         negop->icversion_data[0].major = 3;
 144                         negop->icversion_data[0].minor = 0;
 145                         negop->icversion_data[1].major = 3;
 146                         negop->icversion_data[1].minor = 0;
 147                 } else {
 148                         negop->icversion_data[0].major = 1;
 149                         negop->icversion_data[0].minor = 0;
 150                         negop->icversion_data[1].major = 1;
 151                         negop->icversion_data[1].minor = 0;
 152                 }
 153
 154                 negop->icframe_vercnt = 1;
 155                 negop->icmsg_vercnt = 1;
 156         }
 157 }
 158 EXPORT_SYMBOL(prep_negotiate_resp);
 159
 160 /**
 161  * chn_cb_negotiate() - Default handler for non IDE/SCSI/NETWORK
 162  * Hyper-V requests
 163  * @context: Pointer to argument structure.
 164  *
 165  * Set up the default handler for non device driver specific requests
 166  * from Hyper-V. This stub responds to the default negotiate messages
 167  * that come in for every non IDE/SCSI/Network request.
 168  * This behavior is normally overwritten in the hv_utils driver. That
 169  * driver handles requests like graceful shutdown, heartbeats etc.
 170  *
 171  * Mainly used by Hyper-V drivers.
 172  */
 173 void chn_cb_negotiate(void *context)
 174 {
 175         struct vmbus_channel *channel = context;
 176         u8 *buf;
 177         u32 buflen, recvlen;
 178         u64 requestid;
 179
 180         struct icmsg_hdr *icmsghdrp;
 181         struct icmsg_negotiate *negop = NULL;
 182
 183         buflen = PAGE_SIZE;
 184         buf = kmalloc(buflen, GFP_ATOMIC);
 185
 186         vmbus_recvpacket(channel, buf, buflen, &recvlen, &requestid);
 187
 188         if (recvlen > 0) {
 189                 icmsghdrp = (struct icmsg_hdr *)&buf[
 190                         sizeof(struct vmbuspipe_hdr)];
 191
 192                 prep_negotiate_resp(icmsghdrp, negop, buf);
 193
 194                 icmsghdrp->icflags = ICMSGHDRFLAG_TRANSACTION
 195                         | ICMSGHDRFLAG_RESPONSE;
 196
 197                 vmbus_sendpacket(channel, buf,
 198                                        recvlen, requestid,
 199                                        VM_PKT_DATA_INBAND, 0);
 200         }
 201
 202         kfree(buf);
 203 }
 204 EXPORT_SYMBOL(chn_cb_negotiate);
 205
 206 /*
 207  * Function table used for message responses for non IDE/SCSI/Network type
 208  * messages. (Such as KVP/Shutdown etc)
 209  */
 210 struct hyperv_service_callback hv_cb_utils[MAX_MSG_TYPES] = {
 211         /* 0E0B6031-5213-4934-818B-38D90CED39DB */
 212         /* Shutdown */
 213         {
 214                 .msg_type = HV_SHUTDOWN_MSG,
 215                 .data = {
 216                         0x31, 0x60, 0x0B, 0X0E, 0x13, 0x52, 0x34, 0x49,
 217                         0x81, 0x8B, 0x38, 0XD9, 0x0C, 0xED, 0x39, 0xDB
 218                 },
 219                 .callback = chn_cb_negotiate,
 220                 .log_msg = "Shutdown channel functionality initialized"
 221         },
 222
 223         /* {9527E630-D0AE-497b-ADCE-E80AB0175CAF} */
 224         /* TimeSync */
 225         {
 226                 .msg_type = HV_TIMESYNC_MSG,
 227                 .data = {
 228                         0x30, 0xe6, 0x27, 0x95, 0xae, 0xd0, 0x7b, 0x49,
 229                         0xad, 0xce, 0xe8, 0x0a, 0xb0, 0x17, 0x5c, 0xaf
 230                 },
 231                 .callback = chn_cb_negotiate,
 232                 .log_msg = "Timesync channel functionality initialized"
 233         },
 234         /* {57164f39-9115-4e78-ab55-382f3bd5422d} */
 235         /* Heartbeat */
 236         {
 237                 .msg_type = HV_HEARTBEAT_MSG,
 238                 .data = {
 239                         0x39, 0x4f, 0x16, 0x57, 0x15, 0x91, 0x78, 0x4e,
 240                         0xab, 0x55, 0x38, 0x2f, 0x3b, 0xd5, 0x42, 0x2d
 241                 },
 242                 .callback = chn_cb_negotiate,
 243                 .log_msg = "Heartbeat channel functionality initialized"
 244         },
 245         /* {A9A0F4E7-5A45-4d96-B827-8A841E8C03E6} */
 246         /* KVP */
 247         {
 248                 .data = {
 249                         0xe7, 0xf4, 0xa0, 0xa9, 0x45, 0x5a, 0x96, 0x4d,
 250                         0xb8, 0x27, 0x8a, 0x84, 0x1e, 0x8c, 0x3,  0xe6
 251                 },
 252                 .callback = chn_cb_negotiate,
 253                 .log_msg = "KVP channel functionality initialized"
 254         },
 255 };
 256 EXPORT_SYMBOL(hv_cb_utils);
 257
 258 /*
 259  * alloc_channel - Allocate and initialize a vmbus channel object
 260  */
 261 static struct vmbus_channel *alloc_channel(void)
 262 {
 263         struct vmbus_channel *channel;
 264
 265         channel = kzalloc(sizeof(*channel), GFP_ATOMIC);
 266         if (!channel)
 267                 return NULL;
 268
 269         spin_lock_init(&channel->inbound_lock);
 270
 271         init_timer(&channel->poll_timer);
 272         channel->poll_timer.data = (unsigned long)channel;
 273         channel->poll_timer.function = vmbus_ontimer;
 274
 275         channel->controlwq = create_workqueue("hv_vmbus_ctl");
 276         if (!channel->controlwq) {
 277                 kfree(channel);
 278                 return NULL;
 279         }
 280
 281         return channel;
 282 }
 283
 284 /*
 285  * release_hannel - Release the vmbus channel object itself
 286  */
 287 static void release_channel(struct work_struct *work)
 288 {
 289         struct vmbus_channel *channel = container_of(work,
 290                                                      struct vmbus_channel,
 291                                                      work);
 292
 293         DPRINT_DBG(VMBUS, "releasing channel (%p)", channel);
 294         destroy_workqueue(channel->controlwq);
 295         DPRINT_DBG(VMBUS, "channel released (%p)", channel);
 296
 297         kfree(channel);
 298 }
 299
 300 /*
 301  * free_channel - Release the resources used by the vmbus channel object
 302  */
 303 void free_channel(struct vmbus_channel *channel)
 304 {
 305         del_timer_sync(&channel->poll_timer);
 306
 307         /*
 308          * We have to release the channel's workqueue/thread in the vmbus's
 309          * workqueue/thread context
 310          * ie we can't destroy ourselves.
 311          */
 312         INIT_WORK(&channel->work, release_channel);
 313         queue_work(vmbus_connection.work_queue, &channel->work);
 314 }
 315
 316
 317 DECLARE_COMPLETION(hv_channel_ready);
 318
 319 /*
 320  * Count initialized channels, and ensure all channels are ready when hv_vmbus
 321  * module loading completes.
 322  */
 323 static void count_hv_channel(void)
 324 {
 325         static int counter;
 326         unsigned long flags;
 327
 328         spin_lock_irqsave(&vmbus_connection.channel_lock, flags);
 329         if (++counter == MAX_MSG_TYPES)
 330                 complete(&hv_channel_ready);
 331         spin_unlock_irqrestore(&vmbus_connection.channel_lock, flags);
 332 }
 333
 334 /*
 335  * vmbus_process_rescind_offer -
 336  * Rescind the offer by initiating a device removal
 337  */
 338 static void vmbus_process_rescind_offer(struct work_struct *work)
 339 {
 340         struct vmbus_channel *channel = container_of(work,
 341                                                      struct vmbus_channel,
 342                                                      work);
 343
 344         vmbus_child_device_unregister(channel->device_obj);
 345 }
 346
 347 /*
 348  * vmbus_process_offer - Process the offer by creating a channel/device
 349  * associated with this offer
 350  */
 351 static void vmbus_process_offer(struct work_struct *work)
 352 {
 353         struct vmbus_channel *newchannel = container_of(work,
 354                                                         struct vmbus_channel,
 355                                                         work);
 356         struct vmbus_channel *channel;
 357         bool fnew = true;
 358         int ret;
 359         int cnt;
 360         unsigned long flags;
 361
 362         /* The next possible work is rescind handling */
 363         INIT_WORK(&newchannel->work, vmbus_process_rescind_offer);
 364
 365         /* Make sure this is a new offer */
 366         spin_lock_irqsave(&vmbus_connection.channel_lock, flags);
 367
 368         list_for_each_entry(channel, &vmbus_connection.chn_list, listentry) {
 369                 if (!memcmp(&channel->offermsg.offer.if_type,
 370                             &newchannel->offermsg.offer.if_type,
 371                             sizeof(struct hv_guid)) &&
 372                     !memcmp(&channel->offermsg.offer.if_instance,
 373                             &newchannel->offermsg.offer.if_instance,
 374                             sizeof(struct hv_guid))) {
 375                         fnew = false;
 376                         break;
 377                 }
 378         }
 379
 380         if (fnew)
 381                 list_add_tail(&newchannel->listentry,
 382                               &vmbus_connection.chn_list);
 383
 384         spin_unlock_irqrestore(&vmbus_connection.channel_lock, flags);
 385
 386         if (!fnew) {
 387                 DPRINT_DBG(VMBUS, "Ignoring duplicate offer for relid (%d)",
 388                            newchannel->offermsg.child_relid);
 389                 free_channel(newchannel);
 390                 return;
 391         }
 392
 393         /*
 394          * Start the process of binding this offer to the driver
 395          * We need to set the DeviceObject field before calling
 396          * vmbus_child_dev_add()
 397          */
 398         newchannel->device_obj = vmbus_child_device_create(
 399                 &newchannel->offermsg.offer.if_type,
 400                 &newchannel->offermsg.offer.if_instance,
 401                 newchannel);
 402
 403         DPRINT_DBG(VMBUS, "child device object allocated - %p",
 404                    newchannel->device_obj);
 405
 406         /*
 407          * Add the new device to the bus. This will kick off device-driver
 408          * binding which eventually invokes the device driver's AddDevice()
 409          * method.
 410          */
 411         ret = vmbus_child_device_register(newchannel->device_obj);
 412         if (ret != 0) {
 413                 DPRINT_ERR(VMBUS,
 414                            "unable to add child device object (relid %d)",
 415                            newchannel->offermsg.child_relid);
 416
 417                 spin_lock_irqsave(&vmbus_connection.channel_lock, flags);
 418                 list_del(&newchannel->listentry);
 419                 spin_unlock_irqrestore(&vmbus_connection.channel_lock, flags);
 420
 421                 free_channel(newchannel);
 422         } else {
 423                 /*
 424                  * This state is used to indicate a successful open
 425                  * so that when we do close the channel normally, we
 426                  * can cleanup properly
 427                  */
 428                 newchannel->state = CHANNEL_OPEN_STATE;
 429
 430                 /* Open IC channels */
 431                 for (cnt = 0; cnt < MAX_MSG_TYPES; cnt++) {
 432                         if (memcmp(&newchannel->offermsg.offer.if_type,
 433                                    &hv_cb_utils[cnt].data,
 434                                    sizeof(struct hv_guid)) == 0 &&
 435                                 vmbus_open(newchannel, 2 * PAGE_SIZE,
 436                                                  2 * PAGE_SIZE, NULL, 0,
 437                                                  hv_cb_utils[cnt].callback,
 438                                                  newchannel) == 0) {
 439                                 hv_cb_utils[cnt].channel = newchannel;
 440                                 DPRINT_INFO(VMBUS, "%s",
 441                                                 hv_cb_utils[cnt].log_msg);
 442                                 count_hv_channel();
 443                         }
 444                 }
 445         }
 446 }
 447
 448 /*
 449  * vmbus_onoffer - Handler for channel offers from vmbus in parent partition.
 450  *
 451  * We ignore all offers except network and storage offers. For each network and
 452  * storage offers, we create a channel object and queue a work item to the
 453  * channel object to process the offer synchronously
 454  */
 455 static void vmbus_onoffer(struct vmbus_channel_message_header *hdr)
 456 {
 457         struct vmbus_channel_offer_channel *offer;
 458         struct vmbus_channel *newchannel;
 459         struct hv_guid *guidtype;
 460         struct hv_guid *guidinstance;
 461         int i;
 462         int fsupported = 0;
 463
 464         offer = (struct vmbus_channel_offer_channel *)hdr;
 465         for (i = 0; i < MAX_NUM_DEVICE_CLASSES_SUPPORTED; i++) {
 466                 if (memcmp(&offer->offer.if_type,
 467                     &gSupportedDeviceClasses[i], sizeof(struct hv_guid)) == 0) {
 468                         fsupported = 1;
 469                         break;
 470                 }
 471         }
 472
 473         if (!fsupported) {
 474                 DPRINT_DBG(VMBUS, "Ignoring channel offer notification for "
 475                            "child relid %d", offer->child_relid);
 476                 return;
 477         }
 478
 479         guidtype = &offer->offer.if_type;
 480         guidinstance = &offer->offer.if_instance;
 481
 482         DPRINT_INFO(VMBUS, "Channel offer notification - "
 483                     "child relid %d monitor id %d allocated %d, "
 484                     "type {%02x%02x%02x%02x-%02x%02x-%02x%02x-"
 485                     "%02x%02x%02x%02x%02x%02x%02x%02x} "
 486                     "instance {%02x%02x%02x%02x-%02x%02x-%02x%02x-"
 487                     "%02x%02x%02x%02x%02x%02x%02x%02x}",
 488                     offer->child_relid, offer->monitorid,
 489                     offer->monitor_allocated,
 490                     guidtype->data[3], guidtype->data[2],
 491                     guidtype->data[1], guidtype->data[0],
 492                     guidtype->data[5], guidtype->data[4],
 493                     guidtype->data[7], guidtype->data[6],
 494                     guidtype->data[8], guidtype->data[9],
 495                     guidtype->data[10], guidtype->data[11],
 496                     guidtype->data[12], guidtype->data[13],
 497                     guidtype->data[14], guidtype->data[15],
 498                     guidinstance->data[3], guidinstance->data[2],
 499                     guidinstance->data[1], guidinstance->data[0],
 500                     guidinstance->data[5], guidinstance->data[4],
 501                     guidinstance->data[7], guidinstance->data[6],
 502                     guidinstance->data[8], guidinstance->data[9],
 503                     guidinstance->data[10], guidinstance->data[11],
 504                     guidinstance->data[12], guidinstance->data[13],
 505                     guidinstance->data[14], guidinstance->data[15]);
 506
 507         /* Allocate the channel object and save this offer. */
 508         newchannel = alloc_channel();
 509         if (!newchannel) {
 510                 DPRINT_ERR(VMBUS, "unable to allocate channel object");
 511                 return;
 512         }
 513
 514         DPRINT_DBG(VMBUS, "channel object allocated - %p", newchannel);
 515
 516         memcpy(&newchannel->offermsg, offer,
 517                sizeof(struct vmbus_channel_offer_channel));
 518         newchannel->monitor_grp = (u8)offer->monitorid / 32;
 519         newchannel->monitor_bit = (u8)offer->monitorid % 32;
 520
 521         /* TODO: Make sure the offer comes from our parent partition */
 522         INIT_WORK(&newchannel->work, vmbus_process_offer);
 523         queue_work(newchannel->controlwq, &newchannel->work);
 524 }
 525
 526 /*
 527  * vmbus_onoffer_rescind - Rescind offer handler.
 528  *
 529  * We queue a work item to process this offer synchronously
 530  */
 531 static void vmbus_onoffer_rescind(struct vmbus_channel_message_header *hdr)
 532 {
 533         struct vmbus_channel_rescind_offer *rescind;
 534         struct vmbus_channel *channel;
 535
 536         rescind = (struct vmbus_channel_rescind_offer *)hdr;
 537         channel = relid2channel(rescind->child_relid);
 538         if (channel == NULL) {
 539                 DPRINT_DBG(VMBUS, "channel not found for relId %d",
 540                            rescind->child_relid);
 541                 return;
 542         }
 543
 544         /* work is initialized for vmbus_process_rescind_offer() from
 545          * vmbus_process_offer() where the channel got created */
 546         queue_work(channel->controlwq, &channel->work);
 547 }
 548
 549 /*
 550  * vmbus_onoffers_delivered -
 551  * This is invoked when all offers have been delivered.
 552  *
 553  * Nothing to do here.
 554  */
 555 static void vmbus_onoffers_delivered(
 556                         struct vmbus_channel_message_header *hdr)
 557 {
 558 }
 559
 560 /*
 561  * vmbus_onopen_result - Open result handler.
 562  *
 563  * This is invoked when we received a response to our channel open request.
 564  * Find the matching request, copy the response and signal the requesting
 565  * thread.
 566  */
 567 static void vmbus_onopen_result(struct vmbus_channel_message_header *hdr)
 568 {
 569         struct vmbus_channel_open_result *result;
 570         struct vmbus_channel_msginfo *msginfo;
 571         struct vmbus_channel_message_header *requestheader;
 572         struct vmbus_channel_open_channel *openmsg;
 573         unsigned long flags;
 574
 575         result = (struct vmbus_channel_open_result *)hdr;
 576         DPRINT_DBG(VMBUS, "vmbus open result - %d", result->status);
 577
 578         /*
 579          * Find the open msg, copy the result and signal/unblock the wait event
 580          */
 581         spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags);
 582
 583         list_for_each_entry(msginfo, &vmbus_connection.chn_msg_list,
 584                                 msglistentry) {
 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                                 msginfo->wait_condition = 1;
 597                                 wake_up(&msginfo->waitevent);
 598                                 break;
 599                         }
 600                 }
 601         }
 602         spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags);
 603 }
 604
 605 /*
 606  * vmbus_ongpadl_created - GPADL created handler.
 607  *
 608  * This is invoked when we received a response to our gpadl create request.
 609  * Find the matching request, copy the response and signal the requesting
 610  * thread.
 611  */
 612 static void vmbus_ongpadl_created(struct vmbus_channel_message_header *hdr)
 613 {
 614         struct vmbus_channel_gpadl_created *gpadlcreated;
 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(&vmbus_connection.channelmsg_lock, flags);
 629
 630         list_for_each_entry(msginfo, &vmbus_connection.chn_msg_list,
 631                                 msglistentry) {
 632                 requestheader =
 633                         (struct vmbus_channel_message_header *)msginfo->msg;
 634
 635                 if (requestheader->msgtype == CHANNELMSG_GPADL_HEADER) {
 636                         gpadlheader =
 637                         (struct vmbus_channel_gpadl_header *)requestheader;
 638
 639                         if ((gpadlcreated->child_relid ==
 640                              gpadlheader->child_relid) &&
 641                             (gpadlcreated->gpadl == gpadlheader->gpadl)) {
 642                                 memcpy(&msginfo->response.gpadl_created,
 643                                        gpadlcreated,
 644                                        sizeof(struct vmbus_channel_gpadl_created));
 645                                 msginfo->wait_condition = 1;
 646                                 wake_up(&msginfo->waitevent);
 647                                 break;
 648                         }
 649                 }
 650         }
 651         spin_unlock_irqrestore(&vmbus_connection.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 vmbus_channel_msginfo *msginfo;
 666         struct vmbus_channel_message_header *requestheader;
 667         struct vmbus_channel_gpadl_teardown *gpadl_teardown;
 668         unsigned long flags;
 669
 670         gpadl_torndown = (struct vmbus_channel_gpadl_torndown *)hdr;
 671
 672         /*
 673          * Find the open msg, copy the result and signal/unblock the wait event
 674          */
 675         spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags);
 676
 677         list_for_each_entry(msginfo, &vmbus_connection.chn_msg_list,
 678                                 msglistentry) {
 679                 requestheader =
 680                         (struct vmbus_channel_message_header *)msginfo->msg;
 681
 682                 if (requestheader->msgtype == CHANNELMSG_GPADL_TEARDOWN) {
 683                         gpadl_teardown =
 684                         (struct vmbus_channel_gpadl_teardown *)requestheader;
 685
 686                         if (gpadl_torndown->gpadl == gpadl_teardown->gpadl) {
 687                                 memcpy(&msginfo->response.gpadl_torndown,
 688                                        gpadl_torndown,
 689                                        sizeof(struct vmbus_channel_gpadl_torndown));
 690                                 msginfo->wait_condition = 1;
 691                                 wake_up(&msginfo->waitevent);
 692                                 break;
 693                         }
 694                 }
 695         }
 696         spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags);
 697 }
 698
 699 /*
 700  * vmbus_onversion_response - Version response handler
 701  *
 702  * This is invoked when we received a response to our initiate contact request.
 703  * Find the matching request, copy the response and signal the requesting
 704  * thread.
 705  */
 706 static void vmbus_onversion_response(
 707                 struct vmbus_channel_message_header *hdr)
 708 {
 709         struct vmbus_channel_msginfo *msginfo;
 710         struct vmbus_channel_message_header *requestheader;
 711         struct vmbus_channel_initiate_contact *initiate;
 712         struct vmbus_channel_version_response *version_response;
 713         unsigned long flags;
 714
 715         version_response = (struct vmbus_channel_version_response *)hdr;
 716         spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags);
 717
 718         list_for_each_entry(msginfo, &vmbus_connection.chn_msg_list,
 719                                 msglistentry) {
 720                 requestheader =
 721                         (struct vmbus_channel_message_header *)msginfo->msg;
 722
 723                 if (requestheader->msgtype ==
 724                     CHANNELMSG_INITIATE_CONTACT) {
 725                         initiate =
 726                         (struct vmbus_channel_initiate_contact *)requestheader;
 727                         memcpy(&msginfo->response.version_response,
 728                               version_response,
 729                               sizeof(struct vmbus_channel_version_response));
 730                         msginfo->wait_condition = 1;
 731                         wake_up(&msginfo->waitevent);
 732                 }
 733         }
 734         spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags);
 735 }
 736
 737 /* Channel message dispatch table */
 738 static struct vmbus_channel_message_table_entry
 739         gChannelMessageTable[CHANNELMSG_COUNT] = {
 740         {CHANNELMSG_INVALID,                    NULL},
 741         {CHANNELMSG_OFFERCHANNEL,               vmbus_onoffer},
 742         {CHANNELMSG_RESCIND_CHANNELOFFER,       vmbus_onoffer_rescind},
 743         {CHANNELMSG_REQUESTOFFERS,              NULL},
 744         {CHANNELMSG_ALLOFFERS_DELIVERED,        vmbus_onoffers_delivered},
 745         {CHANNELMSG_OPENCHANNEL,                NULL},
 746         {CHANNELMSG_OPENCHANNEL_RESULT, vmbus_onopen_result},
 747         {CHANNELMSG_CLOSECHANNEL,               NULL},
 748         {CHANNELMSG_GPADL_HEADER,               NULL},
 749         {CHANNELMSG_GPADL_BODY,         NULL},
 750         {CHANNELMSG_GPADL_CREATED,              vmbus_ongpadl_created},
 751         {CHANNELMSG_GPADL_TEARDOWN,             NULL},
 752         {CHANNELMSG_GPADL_TORNDOWN,             vmbus_ongpadl_torndown},
 753         {CHANNELMSG_RELID_RELEASED,             NULL},
 754         {CHANNELMSG_INITIATE_CONTACT,           NULL},
 755         {CHANNELMSG_VERSION_RESPONSE,           vmbus_onversion_response},
 756         {CHANNELMSG_UNLOAD,                     NULL},
 757 };
 758
 759 /*
 760  * vmbus_onmessage - Handler for channel protocol messages.
 761  *
 762  * This is invoked in the vmbus worker thread context.
 763  */
 764 void vmbus_onmessage(void *context)
 765 {
 766         struct hv_message *msg = context;
 767         struct vmbus_channel_message_header *hdr;
 768         int size;
 769
 770         hdr = (struct vmbus_channel_message_header *)msg->u.payload;
 771         size = msg->header.payload_size;
 772
 773         DPRINT_DBG(VMBUS, "message type %d size %d", hdr->msgtype, size);
 774
 775         if (hdr->msgtype >= CHANNELMSG_COUNT) {
 776                 DPRINT_ERR(VMBUS,
 777                            "Received invalid channel message type %d size %d",
 778                            hdr->msgtype, size);
 779                 print_hex_dump_bytes("", DUMP_PREFIX_NONE,
 780                                      (unsigned char *)msg->u.payload, size);
 781                 return;
 782         }
 783
 784         if (gChannelMessageTable[hdr->msgtype].messageHandler)
 785                 gChannelMessageTable[hdr->msgtype].messageHandler(hdr);
 786         else
 787                 DPRINT_ERR(VMBUS, "Unhandled channel message type %d",
 788                            hdr->msgtype);
 789 }
 790
 791 /*
 792  * vmbus_request_offers - Send a request to get all our pending offers.
 793  */
 794 int vmbus_request_offers(void)
 795 {
 796         struct vmbus_channel_message_header *msg;
 797         struct vmbus_channel_msginfo *msginfo;
 798         int ret;
 799
 800         msginfo = kmalloc(sizeof(*msginfo) +
 801                           sizeof(struct vmbus_channel_message_header),
 802                           GFP_KERNEL);
 803         if (!msginfo)
 804                 return -ENOMEM;
 805
 806         init_waitqueue_head(&msginfo->waitevent);
 807
 808         msg = (struct vmbus_channel_message_header *)msginfo->msg;
 809
 810         msg->msgtype = CHANNELMSG_REQUESTOFFERS;
 811
 812
 813         ret = vmbus_post_msg(msg,
 814                                sizeof(struct vmbus_channel_message_header));
 815         if (ret != 0) {
 816                 DPRINT_ERR(VMBUS, "Unable to request offers - %d", ret);
 817
 818                 goto cleanup;
 819         }
 820
 821         msginfo->wait_condition = 0;
 822         wait_event_timeout(msginfo->waitevent, msginfo->wait_condition,
 823                         msecs_to_jiffies(1000));
 824         if (msginfo->wait_condition == 0) {
 825                 ret = -ETIMEDOUT;
 826                 goto cleanup;
 827         }
 828
 829
 830
 831 cleanup:
 832         kfree(msginfo);
 833
 834         return ret;
 835 }
 836
 837 /*
 838  * vmbus_release_unattached_channels - Release channels that are
 839  * unattached/unconnected ie (no drivers associated)
 840  */
 841 void vmbus_release_unattached_channels(void)
 842 {
 843         struct vmbus_channel *channel, *pos;
 844         struct vmbus_channel *start = NULL;
 845         unsigned long flags;
 846
 847         spin_lock_irqsave(&vmbus_connection.channel_lock, flags);
 848
 849         list_for_each_entry_safe(channel, pos, &vmbus_connection.chn_list,
 850                                  listentry) {
 851                 if (channel == start)
 852                         break;
 853
 854                 if (!channel->device_obj->drv) {
 855                         list_del(&channel->listentry);
 856                         DPRINT_INFO(VMBUS,
 857                                     "Releasing unattached device object %p",
 858                                     channel->device_obj);
 859
 860                         vmbus_child_device_unregister(channel->device_obj);
 861                         free_channel(channel);
 862                 } else {
 863                         if (!start)
 864                                 start = channel;
 865                 }
 866         }
 867
 868         spin_unlock_irqrestore(&vmbus_connection.channel_lock, flags);
 869 }
 870
 871 /* eof */